WO2024258150A1 - Dispositif de commande de quantité d'air permettant une vérification sur site d'un phénomène d'adhérence, et système d'alimentation en air de centrale au charbon le comprenant - Google Patents

Dispositif de commande de quantité d'air permettant une vérification sur site d'un phénomène d'adhérence, et système d'alimentation en air de centrale au charbon le comprenant Download PDF

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Publication number
WO2024258150A1
WO2024258150A1 PCT/KR2024/007974 KR2024007974W WO2024258150A1 WO 2024258150 A1 WO2024258150 A1 WO 2024258150A1 KR 2024007974 W KR2024007974 W KR 2024007974W WO 2024258150 A1 WO2024258150 A1 WO 2024258150A1
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WIPO (PCT)
Prior art keywords
air
cylinder
signal
volume control
control device
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Pending
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PCT/KR2024/007974
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English (en)
Korean (ko)
Inventor
이인근
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Individual
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Individual
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Priority claimed from KR1020230077627A external-priority patent/KR102582000B1/ko
Priority claimed from KR1020230124663A external-priority patent/KR102678667B1/ko
Application filed by Individual filed Critical Individual
Publication of WO2024258150A1 publication Critical patent/WO2024258150A1/fr
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L13/00—Construction of valves or dampers for controlling air supply or draught
    • F23L13/06—Construction of valves or dampers for controlling air supply or draught slidable only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L3/00—Arrangements of valves or dampers before the fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/06—Regulating air supply or draught by conjoint operation of two or more valves or dampers

Definitions

  • the present invention relates to an air volume control device for supplying air (e.g., auxiliary air) to a furnace of a boiler for a coal-fired power plant and an air supply system for a coal-fired power plant including the same.
  • air e.g., auxiliary air
  • the furnace of a coal-fired power plant is supplied with pulverized coal and an oxidizer.
  • the oxidizer can be used to achieve complete combustion of the pulverized coal.
  • the oxidizer can be air or pure oxygen. In this specification, the oxidizer and air are collectively referred to as air, and should be appropriately interpreted according to the context.
  • An air volume control device is a device that controls the amount of air so that an appropriate amount of air can be supplied. The amount of air supplied is controlled using an air volume control device.
  • the air volume control device is composed of a cylinder, a positioner, etc.
  • the end of the cylinder rod is connected to an air control plate.
  • the positioner connected to the cylinder drives the cylinder in response to a controlled signal, thereby variably adjusting the linear movement distance of the cylinder rod.
  • the linear movement distance of the cylinder rod controls the opening amount of the air control plate (not shown).
  • the air volume control device Since the air volume control device is installed on the outer wall of the furnace, it is easily exposed to foreign substances such as high temperature, ash, moisture, and dust. This can cause the air volume control device to malfunction.
  • an input signal is input from the driver's seat to the air volume control device to drive the cylinder.
  • the operator measures the linear movement distance of the cylinder rod corresponding to the input signal to determine whether there is a failure.
  • multiple air volume control devices must all be controlled according to the input signal.
  • the purpose of the present invention is to provide an air volume control device that can immediately check for failure on site.
  • the purpose of the present invention is to provide an air volume control device capable of immediately determining a failure of only one air volume control device suspected of failure.
  • the purpose of the present invention is to provide an air volume control device that enables an operator to immediately determine the failure of an air volume control device suspected of failure, even without controlling the input of signal air for inspection from an operation room to the air volume control device.
  • the purpose of the present invention is to provide an air volume control device in which a feedback spring is protected by a covering tube to prevent foreign substances such as dust from entering the interior of the air volume control device, while allowing immediate on-site confirmation of failure.
  • the purpose of the present invention is to provide an air supply system for a coal-fired power plant that can monitor from an operator's cabin and immediately determine which air volume control device requires inspection, in order to check for failure of air volume control devices installed at multiple locations.
  • the present invention provides an air supply system for a coal-fired power plant capable of solving the problem that, in a coal-fired power plant environment, an air volume control device is exposed to high temperature, foreign substances such as ash, moisture, and dust because it is installed on the outer wall of the furnace, and thus the cylinder rod of the air volume control device is fixed and does not move, and therefore, the existing method of determining and inspecting a failure is ineffective, and therefore, it is practically impossible for a worker to check the fixed state of more than 100 air volume control devices, and thus, a failed air volume control device is left unattended.
  • the present invention provides an air volume control device.
  • the cylinder includes a housing forming a cylinder room; a piston dividing the cylinder room into a first cylinder room and a second cylinder room and reciprocating inside the cylinder room; and a cylinder rod coupled with the piston, and the positioner generates movement of the cylinder rod in proportion to an input signal, and includes a first cylinder room communication port communicating with the first cylinder room; and a second cylinder room communication port communicating with the second cylinder room, and includes a first three-way valve provided in a path connecting the first cylinder room communication port and the first cylinder room, one side of which is open to the atmosphere; and a second three-way valve provided in a path connecting the second cylinder room communication port and the second cylinder room, one side of which is open to the atmosphere.
  • the positioner comprises: a signal air input port which is a path through which signal air is introduced as the input signal; a signal pressure chamber which is connected to the signal air input port and includes a first diaphragm which is displaced by the signal air; a nozzle whose back pressure changes by the displacement of the first diaphragm; a pressure air supply port which is a path through which pressure air is introduced; a first communication passage, a second communication passage, and a third communication passage having an orifice which communicate with the pressure air supply port; a spool valve which includes a first spool which opens and closes the first cylinder room communication port, and a second spool which opens and closes the second cylinder room communication port, and which changes the path through which the pressure air moves to either the first cylinder room communication port or the second cylinder room communication port by a change in the back pressure of the nozzle; a supply chamber which is connected to the first communication passage and is closed by the first spool and the second spool; A first supply pressure
  • the positioner may further include a covering tube that surrounds the feedback spring and protects the feedback spring from the outside.
  • the present invention provides an air supply system for a coal-fired power plant.
  • the air supply system for a coal-fired power plant includes a plurality of air volume control devices that share and receive an input signal from one signal air supply source and share and supply pressurized air from one pressure air supply source; and a control unit that controls the air pressure of the signal air and the pressurized air.
  • the air supply system for a coal-fired power plant includes an air volume control device that receives signal air from a signal air supply source according to an input signal and receives pressure air from a pressure air supply source, and the air volume control device includes a cylinder and a positioner, and the cylinder includes a housing that forms a cylinder room; a piston that divides the cylinder room into a first cylinder room and a second cylinder room and reciprocates inside the cylinder room; and a cylinder rod coupled with the piston, and the positioner generates a displacement of the cylinder rod in proportion to an input signal that is an electrical signal in a range of a first value and a second value, and the air supply system further includes a displacement measuring device that generates an electrical signal according to the displacement of the cylinder rod and outputs the generated electrical signal as a feedback signal; and a display unit that visually displays the feedback signal of the displacement measuring device.
  • the input signal and the feedback signal may be current values in the range of 4 mA to 20 mA.
  • an electrical signal applied as the input signal may be converted into a signal air pressure and applied to the positioner.
  • the display unit may be placed in the driver's cabin.
  • the air volume control devices are installed in multiple locations, the air volume control devices are provided in a plurality of groups in which multiple air volume control devices form one group, and one input signal is applied to each group so as to be interlocked, the displacement measuring device is provided for each air volume control device, and the display unit can display the input signal applied to each group and the feedback signal output from each of the displacement measuring devices provided for each air volume control device.
  • an alarm may be displayed on the display unit.
  • the air volume control device can be immediately checked for malfunction on site.
  • an air volume control device According to an air volume control device according to one embodiment of the present invention, it is possible to immediately determine whether only one air volume control device suspected of being defective is defective.
  • An air volume control device enables an operator to immediately determine a failure of an air volume control device suspected of failure, even if a signal air for inspection is not controlled to be input to the air volume control device from an operation room.
  • an air supply system of a coal-fired power plant in order to check whether air volume control devices installed in multiple locations are broken, it is economical because it is possible to monitor from the driver's cabin and immediately determine which air volume control device requires inspection.
  • inspection of an air volume control device can be performed effectively, so that the problem of a malfunctioning air volume control device being left unattended is reduced, and thus the boiler can be operated stably.
  • an air supply system of a coal-fired power plant even if the operator's cabin does not control the signal air for inspection to be input to the air volume control device, the operator can immediately determine the failure of the air volume control device suspected of failure.
  • Figure 1 is a schematic diagram showing a thermal power generation system according to one embodiment.
  • Figure 2 is a plan view showing a windbox (50) installed in a furnace (20) according to one embodiment.
  • FIG. 3 is a schematic diagram illustrating an air supply system according to one embodiment.
  • Figure 4 is a plan view of an air volume control device (100) according to one embodiment of the present invention.
  • Figure 5 is a front view of an air volume control device (100) according to one embodiment of the present invention.
  • FIG. 6 is a drawing explaining the structure of an air volume control device (100) according to one embodiment of the present invention.
  • Figure 7 is a first usage state diagram of an air volume control device (100) according to one embodiment of the present invention.
  • Figure 8 is a second usage state diagram of an air volume control device (100) according to one embodiment of the present invention.
  • Figures 9 and 10 are operation status diagrams during on-site inspection of an air volume control device (100) according to one embodiment of the present invention.
  • Figure 11 is a schematic diagram of an air volume control device (100) according to one embodiment of the present invention.
  • Figures 12 and 13 are front and plan views showing an air volume control device (100) provided with a distance change measuring device (600) for a fault monitoring system.
  • Figure 14 illustrates an air supply system according to an embodiment of the present invention.
  • Figure 15 is a screen configuration of a display unit (810) according to an embodiment of the present invention.
  • expressions such as “same” and “same as” not only indicate a strictly identical state, but also indicate a state in which there is a difference in tolerance, or the degree to which the same function is obtained.
  • 'and/or' includes a combination of multiple listed items or any one of multiple listed items.
  • 'A or B' can include 'A', 'B', or 'both A and B'.
  • FIG 1 is a schematic diagram showing a thermal power plant system according to one embodiment. The thermal power plant system will be described with reference to Figure 1.
  • the thermal power generation system produces electricity using steam generated in a boiler (10).
  • the furnace (20) is a space where a flame (F) is formed.
  • Fuel and an oxidizer can be supplied to the furnace (20) to form the flame (F).
  • the fuel can be coal.
  • the coal can be pulverized coal.
  • An oxidizer can be supplied further to aid combustion of the coal.
  • the oxidizer can be air.
  • the oxidizer can be pure oxygen. In this specification, the oxidizer and air are collectively referred to as air, and the word air should be appropriately interpreted according to the context.
  • the fuel supply unit (30) is configured to supply fuel to the furnace (20).
  • the fuel of the fuel supply unit (30) is supplied to the furnace (20) through the fuel nozzle (32).
  • the fuel supply unit (30) and the fuel nozzle (32) are connected by a fuel supply pipe (31).
  • the fuel supply pipe (31) is a pipe connecting the fuel supply unit (30) and the fuel nozzle (32).
  • the fuel supply pipe (31) may be composed of a plurality of pipes. Each fuel supply pipe (31) may be connected to each fuel nozzle (32).
  • the fuel supply pipe (31) forms a path from the fuel supply unit (30) to the fuel nozzle (32).
  • the drawing shows a first fuel supply pipe (31a), a second fuel supply pipe (31b), a third fuel supply pipe (31c), and a fourth fuel supply pipe (31d).
  • a fuel supply pipe (31) can be appropriately installed in a necessary location.
  • the air supply unit (40) is configured to supply air to the furnace (20). Air is supplied to the furnace (20) through the air nozzle (42).
  • the air supply pipe (41) forms a path from the air supply unit (40) to the air nozzle (42).
  • the air supply pipe (41) is a pipe connecting the air supply unit (40) and the air nozzle (42).
  • the air supply pipe (41) may be composed of a plurality of pipes. Each air supply pipe (41) may be connected to each air nozzle (42).
  • a first air supply pipe (41a), a second air supply pipe (41b), a third air supply pipe (41c), and a fourth air supply pipe (41d) are represented.
  • the air supply pipe (41) may be appropriately provided at necessary locations.
  • a supply amount control device (100) is installed in the air supply pipe (41).
  • the air volume control device (100) adjusts the opening amount of the air supply pipe (41).
  • the supply volume control device (100) will be described in detail later.
  • the fuel nozzle (32) and the air nozzle (42) may be provided in the form of a windbox.
  • FIG. 1 illustrates two windboxes (50). Referring further to FIG. 2, the windboxes (50) are provided at each corner of the furnace (20).
  • the windboxes (50a, 50b, 50c, 50d) at each corner may be configured in the form of an assembly separated into an upper, middle, and lower part.
  • Each assembly may include a plurality of fuel nozzles (32) and a plurality of air nozzles (42).
  • a flame (F) inside the furnace (20) heats water in the superheater (51) to generate saturated steam.
  • the steam from the superheater (51) is provided to a high-pressure turbine (61).
  • the steam used in the high-pressure turbine (61) is recovered and reheated in the reheater (52).
  • the configuration and number of the superheater (51) and reheater (52) are not specific and may be modified according to the configuration of a general thermal power generation system.
  • steam supplied from the reheater (52) is transmitted to the medium-pressure turbine (62) and each low-pressure turbine (63) used.
  • the generator (70) produces electricity through these.
  • the steam used in the low-pressure turbine (63) is finally condensed in the condenser (80).
  • the condensate is supplied to the economizer (53) of the boiler (10).
  • the economizer (53) is connected to the superheater (51).
  • the flue gas treatment device (90) removes harmful substances from the flue gas discharged from the boiler (10).
  • the chimney (95) discharges the flue gas from which the harmful substances have been removed to the outside.
  • Fig. 3 is a schematic drawing of an air supply system according to one embodiment. The air supply system will be described with reference to Fig. 3.
  • the air supply system (1000) is a system for supplying air to the furnace (20). It is a system for supplying air from the air supply unit (40) to the air nozzle (42).
  • An air volume control device (100) is installed in the air supply pipe (41). The air volume control device (100) controls the air supply amount of each air nozzle (42).
  • four air volume control devices (100) are configured to be interlocked with each other. The interlocking points of the air volume control devices (100) can be appropriately adjusted according to the design, but for equipment efficiency, a plurality of air volume control devices (100) are interlocked and driven by one signal.
  • each of the air volume control devices (100) connected to the 1-1 air nozzle (42aa), the 1-2 air nozzle (42ab), the 1-3 air nozzle (42ac), and the 1-4 air nozzle (42ad) shares one signal air.
  • the signal air is an embodiment of an input signal for controlling the air volume control device (100).
  • the 1-1 signal air pipe (211a), the 1-2 signal air pipe (212a), the 1-3 signal air pipe (213a), and the 1-4 signal air pipe (214a) branched from one signal air supply source (210a) are connected to each of the air volume control devices (100).
  • each of the air volume control devices (100) connected to the 1-1 air nozzle (42aa), the 1-2 air nozzle (42ab), the 1-3 air nozzle (42ac), and the 1-4 air nozzle (42ad) shares a single pressure air.
  • the 1st pressure air pipe (221a), the 2nd pressure air pipe (222a), the 1-3rd pressure air pipe (223a), and the 1-4th pressure air pipe (224a) branched from a single pressure air supply source (220a) are connected to each of the air volume control devices (100).
  • each of the air amount control devices (100) connected to the 2-1 air nozzle (42ba), the 2-2 air nozzle (42bb), the 2-3 air nozzle (42bc), and the 2-4 air nozzle (42bd) shares one signal air.
  • the 2-1 signal air pipe (211b), the 2-2 signal air pipe (212b), the 2-3 signal air pipe (213b), and the 2-4 signal air pipe (214b), which are branched from one signal air supply source (210b), are connected to each of the air amount control devices (100).
  • each of the air volume control devices (100) connected to the 2-1 air nozzle (42ba), the 2-2 air nozzle (42bb), the 2-3 air nozzle (42bc), and the 2-4 air nozzle (42bd) shares one pressurized air (220b).
  • the 2-1 pressurized air pipe (221b), the 2-2 pressurized air pipe (222b), the 2-3 pressurized air pipe (223b), and the 2-4 pressurized air pipe (224b) branched from one pressurized air supply source (220b) are connected to each of the air volume control devices (100).
  • Proper air supply is important for stability in the furnace (20). For example, proper distribution and supply of air at fuel ignition and low load is important for stability in the furnace (20). In addition, proper air supply is important for obtaining optimum combustion over full load. In addition, distribution of primary and secondary air has a great influence on the formation of nitrogen oxides. In general, reducing the amount of air after the fuel, combined with the large amount of air above the fuel nozzle, reduces the amount of nitrogen oxides produced. This principle is to suppress the combustion rate so that the heat is not transferred to the water wall before the maximum temperature is reached. When the maximum temperature is reached, the amount of NOx produced is lower than when not restricted. Distribution of secondary air also affects the diffusion of pollutants.
  • the optimum air distribution ratio is basically determined by the combustion characteristics of the fuel and is also affected by the mixing combustion rate and the flame shape in the furnace.
  • the air supply system (1000) modulates the air volume control device (100) to position the differential pressure between the set wind box (50) and the furnace (20).
  • the fuel supply control device (not shown) and the air volume control device (100) should be closed before starting and open after starting to modulate in proportion to the combustion rate.
  • Fig. 4 is a plan view of an air volume control device (100) according to an embodiment of the present invention.
  • Fig. 5 is a front view of an air volume control device (100) according to an embodiment of the present invention. The appearance of an air volume control device (100) according to an embodiment will be described with reference to Figs. 4 and 5.
  • An air volume control device (100) includes a positioner (300) and a cylinder (400).
  • the cylinder (400) is driven by the control of the positioner (300) of the air volume control device (100) to adjust the opening amount of an air control plate (not shown) connected to a cylinder rod (410).
  • the positioner (300) may include a first pressure gauge (311) and a second pressure gauge (321).
  • the first pressure gauge (311) is a pressure gauge for measuring the pressure of signal air supplied from a signal air supply source.
  • the second pressure gauge (321) is a pressure gauge for measuring the pressure of pressurized air supplied from a pressurized air supply source.
  • the positioner (300) may include a feedback unit (390).
  • the feedback unit (390) is connected to the cylinder rod (410) through a feedback connection unit (391).
  • One end of the feedback connection unit (391) is connected to the feedback unit (390), and the other end is connected to the cylinder rod (410).
  • the feedback section (390) can be protected by a feedback section covering tube (392).
  • the feedback section covering tube (392) is a corrugated tube made of heat-resistant rubber material.
  • the feedback section covering tube (392) surrounds the feedback section (390).
  • the heat-resistant rubber material includes a fluorine rubber material and a silicone rubber material.
  • the cylinder rod (410) can be protected by a shaft portion covering tube (412).
  • the shaft portion covering tube (412) wraps around the cylinder rod (410).
  • the cylinder rod covering tube (412) is a corrugated tube made of heat-resistant rubber material.
  • the feedback control unit cladding (392) and the cylinder rod cladding (412) block foreign substances from entering the cylinder (400) or the positioner (300) when the feedback unit (390) and the cylinder rod (410) move linearly and return to their original state.
  • the ruler (395) is a configuration in which a scale is displayed for measuring the linear movement distance of the cylinder rod (410) and the feedback unit (390).
  • the indicator (396) moves relative to the ruler (395).
  • the indicator (396) is connected to the feedback connection unit (391).
  • the indicator (396) moves according to the movement of the feedback connection unit (391). Since the feedback connection unit (391) connects the feedback unit (390) and the cylinder rod (410), the indicator (911) moves according to the linear movement of the cylinder rod (410).
  • the opening amount can be indicated in % units on the ruler (395).
  • the positioner (300) is provided with a signal air input port (312).
  • the signal air input port (312) is connected to a signal air supply pipe (see FIG. 3). Signal air enters the interior of the positioner (300) through the signal air input port (312).
  • the positioner (300) receives signal air through the signal air input port (312).
  • the positioner (300) is provided with a pressure air supply port (322).
  • the pressure air supply port (322) is connected to a pressure air supply pipe (see FIG. 3). Pressure air enters the interior of the positioner (300) through the pressure air supply port (322).
  • the positioner (300) is supplied with pressure air through the pressure air supply port (322).
  • the first pipe (341) connects the first cylinder room communication port (361, see FIG. 6) of the positioner (300) and the first cylinder room (421, see FIG. 6) of the cylinder (400).
  • a first three-way valve (510) is installed in the first pipe (341). The point indicated by the chain line is a position that can be adjusted by the operator when checking the air volume control device (100) using the first three-way valve (510).
  • the second pipe (342) connects the second cylinder room communication port (362, see FIG. 6) of the positioner (300) and the second cylinder room (422, see FIG. 6) of the cylinder (400).
  • a second three-way valve (520) is installed in the second pipe (342). The point indicated by the chain line is a position that can be adjusted by the operator when checking the air volume control device (100) using the second three-way valve (520).
  • FIG. 6 is a drawing explaining the structure of an air volume control device (100) according to an embodiment of the present invention.
  • the structure of an air volume control device (100) according to the embodiment will be explained with reference to FIG. 6.
  • a positioner (300) of one embodiment is described.
  • a flow path is provided inside the positioner (300).
  • a spool valve (350) is located inside the positioner (300).
  • the spool valve (350) controls the flow path.
  • the spool valve (350) has a first spool (351) and a second spool (352) positioned with a first neck (355a) therebetween.
  • the first neck (355a) has a smaller diameter than the first spool (351) and the second spool (352).
  • a second neck (355b) is located on the opposite side of the first neck (355a) with respect to the first spool (351).
  • a third neck (355c) is located on the opposite side of the first neck (355a) with respect to the second spool (352).
  • a third diaphragm (333) and a fourth diaphragm (334) are fixed to each end of the spool valve (350).
  • a third diaphragm (333) is fixed to the end of the second neck (355b).
  • a fourth diaphragm (334) is fixed to the end of the third neck (355c).
  • the positioner (300) is provided with a signal air input port (312) and a pressure air supply port (322).
  • the signal air input port (312) is connected to the signal air supply source (210a).
  • the signal air input port (312) is connected to the signal air supply source (210a) through a signal air supply pipe (211a).
  • the signal air transmitted through the signal air supply source (210a) through the signal air input port (312) is supplied to the interior of the positioner (300).
  • the signal air introduced through the signal air input port (312) is introduced into the signal pressure chamber (313).
  • the signal pressure chamber (313) is a space closed by the first diaphragm (331) and the second diaphragm (332).
  • the cylinder rod (410) moves in proportion to the air pressure of the signal air input into the signal pressure chamber (313).
  • the connecting member (393) is connected to one end of the feedback member (390).
  • the connecting member (393) is coupled with the first diaphragm (331) and the second diaphragm (332).
  • the feedback member (390) according to the embodiment is a coil spring.
  • the feedback member (390) is referred to as a feedback spring (320).
  • the force resulting from the movement of the connecting member (393) is transmitted to the feedback spring (320).
  • the force of the feedback spring (320) is transmitted to the connecting member (393).
  • the pressure air supply port (322) is connected to the pressure air supply source (220a).
  • the pressure air supply port (322) is connected to the pressure air supply source (220a) through the pressure air supply pipe (221a).
  • Pressure air delivered from the pressure air supply source (220a) through the pressure air supply port (322) is supplied to the interior of the positioner (300).
  • the path connected to the pressure air supply port (322) branches into a first communication path (323a), a second communication path (323b), and a third communication path (323c). That is, the pressure air introduced through the pressure air supply port (322) is supplied by branching into the first communication path (323a), the second communication path (323b), and the third communication path (323c).
  • the first communication passage (323a) communicates with the supply room (324) which is closed by the first spool (351) and the second spool (352).
  • the second communication passage (323b) communicates with the third diaphragm room (325a) which is closed by the third diaphragm (333).
  • the third communication passage (323c) communicates with the fourth diaphragm chamber (325b) which is closed by the fourth diaphragm (334).
  • An orifice (323ca) is provided in the third communication passage (323c).
  • the supply pressure chamber (325) is a concept that includes a third diaphragm chamber (325a) and a fourth diaphragm chamber (325b).
  • the third diaphragm chamber (325a) may be referred to as a first supply pressure chamber.
  • the fourth diaphragm chamber (325b) may be referred to as a second supply pressure chamber.
  • the first cylinder communication port (361) is opened and closed by the first spool (351).
  • the spool valve (350) moves in the A direction and the first spool (351) opens the first cylinder communication port (361), the first communication path (323a) and the first cylinder communication port (361) are connected.
  • the second cylinder communication port (362) is opened and closed by the second spool (352).
  • the spool valve (350) moves in the B direction and the second spool (352) opens the second cylinder communication port (362), the first communication path (323a) and the second cylinder communication port (362) communicate.
  • the nozzle (370) is connected to the fourth diaphragm (334).
  • the nozzle (370) is connected to the spool valve (350).
  • the nozzle (370) is coupled to the spool valve (350) and/or the fourth diaphragm (334). This coupling includes both direct coupling and indirect coupling.
  • the spool valve (350) can move dependently upon the movement of the nozzle (370).
  • the nozzle (370) can move dependently upon the movement of the spool valve (350).
  • the nozzle (370) can face the connecting member (393).
  • the nozzle (370) penetrates the wall (325ba) forming the fourth diaphragm chamber (325b).
  • a sealing may be provided at the contact surface between the wall (325ba) and the nozzle (370).
  • the nozzle (370) can slide along the wall (325ba).
  • the first exhaust chamber (381) is formed in the space between the first diaphragm (331) and the nozzle (370).
  • the first exhaust chamber (381) communicates with the first exhaust port (381a).
  • the first exhaust chamber (381) communicates with the atmosphere through the first exhaust port (381a).
  • the first exhaust chamber (381) and the fourth diaphragm chamber (325b) communicate through the nozzle (370).
  • the pressure fluid supplied to the fourth diaphragm chamber (325b) is introduced into the first exhaust chamber (381) through the nozzle (370).
  • the pressure fluid introduced into the first exhaust chamber (381) is discharged to the outside through the first exhaust port (381a).
  • the second exhaust chamber (382) is formed in the space between the third diaphragm (333) and the first spool (351).
  • the second exhaust chamber (382) communicates with the second exhaust port (382a).
  • the second exhaust chamber (382) communicates with the atmosphere through the second exhaust port (382a).
  • the third exhaust chamber (383) is formed in the space between the fourth diaphragm (334) and the second spool (352).
  • the third exhaust chamber (383) communicates with the third exhaust port (383a).
  • the third exhaust chamber (383) communicates with the atmosphere through the third exhaust port (383a).
  • a cylinder (400) has a first cylinder room (421) and a second cylinder room (422) provided inside a cylinder housing (401).
  • the first cylinder room (421) and the second cylinder room (422) are partitioned by a piston (430).
  • the volumes of the first cylinder room (421) and the second cylinder room (422) change depending on the movement of the piston (430).
  • the piston (430) is connected to the cylinder rod (410).
  • the cylinder rod (410) is installed facing the second cylinder chamber (422).
  • the first side port (421a) communicates with the first cylinder room (421).
  • the first side port (421a) communicates with the first cylinder room communication port (361) through the first pipe (341).
  • a first three-way valve (510) is provided in a path communicating between the first side port (421a) and the first cylinder room communication port (361).
  • the first path of the first three-way valve (510) is connected to the first cylinder room communication port (361), the second path is connected to the first side port (421a), and the third path is connected to the atmosphere.
  • the secondary port (422a) communicates with the second cylinder room (422).
  • the secondary port (422a) communicates with the second cylinder room communication port (362) through the second pipe (342).
  • a second three-way valve (520) is provided in a path communicating between the secondary port (422a) and the second cylinder room communication port (362).
  • the first path of the second three-way valve (520) is connected to the second cylinder room communication port (362), the second path is connected to the second port (422a), and the third path is connected to the atmosphere.
  • Fig. 7 is a diagram showing a first use state of an air volume control device (100) according to one embodiment of the present invention. The first use state will be described with reference to Fig. 7.
  • an air pressure of 1 kgf/cm 2 (maximum signal air pressure according to the embodiment) is supplied as signal air.
  • An air pressure of 5 kgf/cm 2 is supplied as pressurized air.
  • the side leading to the atmosphere of the first three-way valve (510) is closed.
  • the side leading to the atmosphere of the second three-way valve (520) is closed.
  • the signal air fills the signal pressure chamber (313).
  • the signal pressure chamber (313) is filled with the air pressure of the signal air
  • the first diaphragm (331) is displaced by the generated force.
  • the gap with the nozzle (370) changes due to the displacement of the first diaphragm (331).
  • the nozzle (370) back pressure changes due to the change in the gap between the first diaphragm (331) and the nozzle (370).
  • the generated force of the fourth diaphragm (334) overcomes the generated force of the third diaphragm (333) due to the back pressure of the nozzle (370).
  • the spool valve (350) moves in the A direction due to the generated force of the fourth diaphragm (334).
  • the first spool (351) opens the first cylinder room communication port (361).
  • the flow path of the supply room (324) is formed into a path through the first cylinder room communication port (361).
  • the flow path of the supply room (324) is closed into a path through the second cylinder room communication port (362).
  • the pressurized air flows into the first cylinder chamber (421) through the first cylinder chamber communication port (361).
  • the first cylinder chamber (421) is filled with the air pressure of the pressurized air.
  • the air pressure of the pressurized air pushes the piston (430) in the B direction.
  • the air in the second cylinder chamber (422) is exhausted.
  • the air in the second cylinder chamber (422) is exhausted, and the cylinder rod (410) moves in the B direction according to the movement of the piston (430).
  • the movement of the cylinder rod (410) is transmitted to the feedback spring (320) by the feedback connection (391), and the cylinder rod (410) moves until it is parallel to the generating force of the first diaphragm (331). As a result, a displacement of the cylinder rod (410) proportional to the input signal air occurs.
  • Fig. 8 is a second use state diagram of an air volume control device (100) according to one embodiment of the present invention. The second use state will be described with reference to Fig. 8.
  • air pressure of 0.2 kgf/cm 2 (minimum signal air pressure according to the embodiment) is supplied as signal air.
  • Air pressure of 5 kgf/cm 2 is supplied as pressurized air.
  • the side leading to the atmosphere of the first three-way valve (510) is closed.
  • the side leading to the atmosphere of the second three-way valve (520) is closed.
  • the signal air fills the signal pressure chamber (313).
  • the signal pressure chamber (313) is filled with the air pressure of the signal air
  • the first diaphragm (331) is displaced by the generated force.
  • the gap with the nozzle (370) changes due to the displacement of the first diaphragm (331).
  • the generated force of the third diaphragm (333) due to the air pressure of the pressurized air moves the spool valve (350) in the B direction.
  • the second spool (352) opens the second cylinder room communication port (362).
  • the flow path of the supply chamber (324) is formed as a path to the second cylinder room communication port (362).
  • the flow path of the supply chamber (324) is closed as a path to the first cylinder room communication port (361).
  • the pressurized air flows into the second cylinder chamber (422) through the second cylinder chamber communication port (362).
  • the second cylinder chamber (422) is filled with the air pressure of the pressurized air.
  • the air pressure of the pressurized air pushes the piston (430) in the A direction.
  • the air in the first cylinder chamber (421) is exhausted.
  • the air in the first cylinder chamber (421) is exhausted, and the cylinder rod (410) moves in the A direction according to the movement of the piston (430).
  • the movement of the cylinder rod (410) is transmitted to the feedback spring (320) by the feedback connection (391), and the cylinder rod (410) moves until it is parallel to the generating force of the first diaphragm (331). As a result, a displacement of the cylinder rod (410) proportional to the input signal air occurs.
  • FIGS. 9 and 10 are operation status diagrams during on-site inspection of an air volume control device (100) according to one embodiment of the present invention. The operation of the air volume control device (100) during on-site inspection will be described with reference to FIGS. 9 and 10.
  • an air pressure of 0.6 kgf/cm 2 (an intermediate value of the signal air according to the embodiment) is supplied as signal air.
  • An air pressure of 5 kgf/cm 2 is supplied as pressurized air.
  • the pressurized air is supplied through the first cylinder room communication port (361) and the second cylinder room communication port (362) so that the air pressures of the first cylinder room (421) and the second cylinder room (422) are equal. That is, the pressurized air is distributed and supplied through the first cylinder room communication port (361) and the second cylinder room communication port (362) so that the air pressures of the first cylinder room (421) and the second cylinder room (422) are equal.
  • the air pressure of the first cylinder chamber (421) is lower than the air pressure of the second cylinder chamber (422)
  • pressurized air is supplied to the first cylinder chamber (421) by the balance of the generating force of the first diaphragm (331), the back pressure of the nozzle (370), the force of the feedback spring (320), etc.
  • the air pressure of the second cylinder chamber (422) is lower than the air pressure of the first cylinder chamber (421)
  • pressurized air is supplied to the second cylinder chamber (422) by the balance of the generating force of the first diaphragm (331), the back pressure of the nozzle (370), the force of the feedback spring (320), etc.
  • the air pressures of the first cylinder chamber (421) and the second cylinder chamber (422) become equal (omitted from the drawing).
  • FIG. 9 describes the operation when checking the air control device (100) by adjusting the first three-way valve (510)
  • FIG. 10 describes the operation when checking the air control device (100) by adjusting the second three-way valve (520).
  • Fig. 9 shows a state in which the atmospheric side of the first three-way valve (510) is open and the first cylinder room communication port (361) side is closed. That is, the first cylinder room (421) is in communication with the atmosphere. The side of the second three-way valve (520) that is connected to the atmosphere is closed.
  • the first cylinder chamber (421) and the second cylinder chamber (422) are each in a balanced state with an air pressure of 5 kgf/cm 2 .
  • the first cylinder chamber (421) is opened, the internal air of the first cylinder chamber (421) is exhausted, and the internal pressure is converted to atmospheric pressure.
  • the air pressure of the second cylinder chamber (422) becomes dominant, and the piston (430) moves in the A direction.
  • the spool valve (350) moves in the B direction, and the second spool (352) opens the second cylinder chamber communication port (362).
  • the flow path of the supply room (324) is formed into a path through the second cylinder room communication port (362).
  • the flow path of the supply room (324) is closed into the first cylinder room communication port (361).
  • the pressurized air flows into the second cylinder room (422) through the second cylinder room communication port (362).
  • the second cylinder room (422) is filled with the air pressure of the pressurized air.
  • the air pressure of the pressurized air can further push the piston (430) in the A direction.
  • the cylinder rod (410) can move in the A direction according to the operating status of the first three-way valve (310) regardless of the signal air. For example, the speed of movement in the A direction can be controlled according to the speed of switching the first three-way valve (310). If the air volume control device (100) is broken due to environmental conditions such as high temperature, ash, moisture, and dust, the cylinder rod (410) does not move properly in the A direction. Therefore, the operator can immediately determine the failure of the air volume control device (100) by observing the movement of the cylinder rod (410).
  • the cylinder rod (410) returns to a position proportional to the signal air.
  • Fig. 10 shows a state in which the first three-way valve (510) is closed on the atmospheric side and the first cylinder communication port (361) side is open, similar to the state of use described in Fig. 7.
  • the atmospheric side of the second three-way valve (520) is open and the second cylinder communication port (362) side is closed.
  • the spool valve (350) moves in the A direction, and the first spool (351) opens the first cylinder room communication port (361).
  • the flow path of the supply room (324) is formed as a path to the first cylinder room communication port (361).
  • the flow path of the supply room (324) is closed as a path to the second cylinder room communication port (362).
  • the pressurized air flows into the first cylinder room (421) through the first cylinder room communication port (361).
  • the first cylinder room (421) is filled with the air pressure of the pressurized air.
  • the air pressure of the pressurized air can further push the piston (430) in the B direction.
  • the cylinder rod (410) can move in the B direction depending on the operating status of the second three-way valve (520) regardless of the signal air. For example, the speed of movement in the B direction can be controlled depending on the speed of switching the second three-way valve (520). If the air volume control device (100) is broken due to environmental conditions such as high temperature, ash, moisture, and dust, the cylinder rod (410) does not move properly in the B direction. Therefore, the operator can immediately determine the failure of the air volume control device (100) by observing the movement of the cylinder rod (410).
  • the first three-way valve (510) should be interpreted as an equivalent unit by grouping multiple configurations, not only as a single valve, but also as performing the functions of opening the first cylinder chamber (421) to the atmosphere and closing the first cylinder chamber communication port (361).
  • the path switching is convenient, there is an effect of preventing worker errors.
  • the second three-way valve (520) is not limited to a single configuration, but should be interpreted as an equivalent entity by grouping multiple configurations when it performs the function of opening the second cylinder room (422) to the atmosphere and closing the second cylinder room communication port (362).
  • the second three-way valve (520) it is advantageous in that it is possible to prevent mistakes by workers because the path switching is convenient.
  • FIG. 11 is a schematic diagram of an air volume control device (100) according to an embodiment of the present invention.
  • the air volume control device (100) will be described with reference to FIG. 11.
  • Instrument air is supplied to a positioner after having moisture and/or oil removed from it by a mist separator.
  • the air pressure of the signal air is 0.2 kgf/cm 2
  • the pressure air flows to OUT2 in the positioner (300)
  • the pressure air is 1 kgf/cm 2
  • the pressure air flows to OUT1.
  • the pressure air is usually supplied by distributing it to OUT1 and OUT2.
  • path 1 is blocked and the cylinder moves toward the lower pressure side.
  • Paths 2 and 4 also operate according to the same principles as paths 1 and 3.
  • the air volume control device (100) it is possible to immediately check whether the air volume control device (100) is broken on site. If a failure of the device is suspected, the failure can be confirmed by switching the air path using the first three-way valve (510) and the second three-way valve (520).
  • the first three-way valve (510) and the second three-way valve (520) according to the embodiment can be provided as ball valves.
  • the air volume control device (100) Since the air volume control device (100) is installed on the outer wall of the furnace (20), it is exposed to foreign substances such as high temperature, ash, moisture, and dust, so that rust or deformation may occur, resulting in a failure of the device. However, in the past, it was necessary to adjust the air pressure of the signal air using the control unit (a concept including the input unit and the display unit) in the driver's room to move the cylinder rod (410). In other words, the failure could not be immediately confirmed on site. However, according to an embodiment of the present invention, since the same effect as adjusting the air pressure of the signal air to the maximum and minimum values by only operating the valve on site is obtained, the failure of the air volume control device (100) can be immediately identified on site.
  • FIGS. 12 and 13 are front and plan views showing an air volume control device (100) provided with a displacement measuring device (600) for a fault monitoring system.
  • the displacement measuring device (600) may be a Linear Variable Displacement Transducer (LVDT).
  • the displacement measuring device (600) measures the distance change according to the forward and backward movement of the cylinder rod (410).
  • the displacement measuring device (600) outputs the distance change as an electrical signal.
  • the output electrical signal is used as a feedback signal for determining whether the air volume measuring device (100) is operating normally according to the input signal.
  • the range of the electrical signal output by the displacement measuring device (600) is set to have a first value to a second value, which is the same range as the input signal for generating the displacement of the cylinder rod (410).
  • the normal electrical signal of the displacement measuring device output according to the normal displacement is set to output the same value as the electrical signal, which is the input signal. Accordingly, since the feedback signal is output with the same value as the input signal in an ideal normal state, it is possible to intuitively determine whether the displacement of the cylinder rod (410) has occurred appropriately in response to the input signal. Meanwhile, a power source for the displacement measuring device (600) may be connected to the displacement measuring device (600), and its representation in the drawing is omitted.
  • Fig. 14 illustrates an air supply system according to an embodiment of the present invention.
  • a system operator may reside in the driver's cabin (800).
  • the system operator may operate an input unit (810) installed in the driver's cabin (800).
  • the operating status of the system may be checked through the display unit (820).
  • the air volume control device (100) is provided in multiple units as a group. In the embodiment, it is expressed that four air volume control devices (100a, 100b, 100d, 100d) are provided in one group.
  • the air volume control devices (100) can be installed at the corners of the furnace (20), and a layer can form one group.
  • the group of air volume control devices can be provided in multiple units. In this specification, one group is illustrated and described for concise explanation.
  • Each of the air volume control devices (100a, 100b, 100d, 100d) forming one group can be driven in conjunction with one input signal (S1).
  • the input signal (S1) can be input from the driver's cabin through the input unit (810). In the embodiment, the input signal (S1) is an electrical signal.
  • the maximum value of the input signal (S1) can be defined as the first value, and the minimum value can be defined as the second value.
  • the input signal (S1) may be a current value in the range of 4 mA to 20 mA.
  • the input signal (S1) is converted into signal air (S2) and applied to each air volume control device (100).
  • the input signal (S1) may be converted into signal air (S2) through the electro-pneumatic converter (900).
  • the signal air (S2) may be converted into 0.6 kgf/cm2, which is an intermediate value of the signal air described above, and applied to the positioner (300).
  • the displacement measuring device (600) outputs a current value according to the position of the cylinder rod (410, see FIG. 13) of the air volume control device (100) as a feedback signal and transmits it to the driver's cab.
  • the displacement measuring device (600) is installed in each air volume control device (100).
  • the feedback signals (P1, P2, P3, P4) measured in each of the displacement measuring devices (600a, 600b, 600c, 600d) are transmitted to the driver's cab (800).
  • the feedback signals (P1, P2, P3, P4) are displayed on the display unit (820).
  • the driver's cabin (800) by monitoring the feedback signals (P1, P2, P3, P4) output from the displacement measuring device (600), it is possible to monitor whether the air volume control device (100) is operating normally. If the current value of the displacement measuring device (600a) is out of the error range, it is possible to recognize in the driver's cabin (800) that the air volume control device (100a) needs to be inspected. In the driver's cabin, the necessity of inspecting the air volume control device (100a) can be conveyed to the field worker, and whether there is a malfunction can be confirmed in the field.
  • Fig. 15 is a screen configuration of a display unit (810) according to an embodiment of the present invention.
  • the display unit (810) may be configured as a monitor.
  • the display unit (810) according to the embodiment displays an input signal and a feedback signal input for each air volume control device (100).
  • the screen configuration according to the embodiment only two groups of air volume control devices (100), the first group and the second group, are shown as examples, but dozens of groups may be displayed on the display unit (810).
  • the embodiment will be described with reference to the drawings.
  • the display unit (810) indicates that a first input signal (S1-1) is input to the air volume control devices (100a, 100b, 100c, 100d) forming the first group.
  • a state in which a second input signal (S1-2) is input to the air volume control devices (100e, 100f, 100g, 100h) forming the second group is indicated.
  • the display unit (810) displays feedback signals (P1 to P8) according to the displacement of each air volume control device (100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h).
  • the error range of the feedback signal is set to +-5%.
  • the feedback signal (P1) is normally in the range of 11.4 mA to 12.6 mA.
  • the feedback signal (P1) of the air volume control device (100a) is output as 8.0 mA. This is out of the error range and requires inspection. The driver in the driver's cab can recognize that the air volume control device (100a) requires inspection by looking at the feedback signal (P1).
  • a notification may be provided so that the driver can recognize it.
  • the notification may be a visual notification displayed through the display unit (810).
  • the notification may be displayed in a different color than when it is in a normal state.
  • the feedback signal is displayed in blue when it is in a normal state, and in red when it is out of the error range.
  • an input signal for inspection is applied from the driver's cabin (800), and a feedback signal is observed to identify an air volume control device (100) that needs inspection among air volume control devices (100) installed at multiple locations.
  • a thermal power generation system can monitor the failure of an air volume control device in a driver's cabin, thereby identifying a location where a failure is suspected and requires inspection, and can confirm on-site whether the air volume control device of a location where a failure is suspected is broken. According to an embodiment of the present invention, since the failure of an air volume control device can be confirmed on-site, efficient failure confirmation is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne un dispositif de commande de quantité d'air permettant de vérifier immédiatement sur site si une défaillance s'est produite dans celui-ci. De plus, il est possible de déterminer immédiatement une défaillance pour un seul dispositif de commande de quantité d'air suspecté d'être défaillant, et un opérateur peut déterminer immédiatement une défaillance dans un dispositif de commande de quantité d'air suspecté d'être défaillant, même sans commande de poste de contrôle de telle sorte que l'air de signal est amené dans le dispositif de commande de quantité d'air.
PCT/KR2024/007974 2023-06-16 2024-06-11 Dispositif de commande de quantité d'air permettant une vérification sur site d'un phénomène d'adhérence, et système d'alimentation en air de centrale au charbon le comprenant Pending WO2024258150A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2023-0077627 2023-06-16
KR1020230077627A KR102582000B1 (ko) 2023-06-16 2023-06-16 고착 현상 현장 체크 가능한 공기량 조절 장치 및 이를 포함하는 석탄 화력 발전소의 공기 공급 시스템
KR1020230124663A KR102678667B1 (ko) 2023-09-19 2023-09-19 공기량 조절 장치의 모니터링 및 고착 현상을 현장에서 체크 가능한 석탄 화력 발전소의 공기 공급 시스템
KR10-2023-0124663 2023-09-19

Publications (1)

Publication Number Publication Date
WO2024258150A1 true WO2024258150A1 (fr) 2024-12-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2024/007974 Pending WO2024258150A1 (fr) 2023-06-16 2024-06-11 Dispositif de commande de quantité d'air permettant une vérification sur site d'un phénomène d'adhérence, et système d'alimentation en air de centrale au charbon le comprenant

Country Status (1)

Country Link
WO (1) WO2024258150A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070016783A (ko) * 2005-08-05 2007-02-08 삼성전자주식회사 공압실린더
KR200445503Y1 (ko) * 2008-04-02 2009-08-06 한국남동발전 주식회사 보일러의 보조 공기 조절 장치
KR101355691B1 (ko) * 2013-06-26 2014-01-28 한국남동발전 주식회사 미분기 및 이를 포함하는 석탄 연소 시스템
KR20160131924A (ko) * 2015-05-08 2016-11-16 에스엠시 가부시키가이샤 유로전환유닛
KR20190058548A (ko) * 2016-09-21 2019-05-29 메트소 플로우 컨트롤 오와이 액추에이터용 방법 및 컨트롤러
KR102582000B1 (ko) * 2023-06-16 2023-09-22 이인근 고착 현상 현장 체크 가능한 공기량 조절 장치 및 이를 포함하는 석탄 화력 발전소의 공기 공급 시스템

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070016783A (ko) * 2005-08-05 2007-02-08 삼성전자주식회사 공압실린더
KR200445503Y1 (ko) * 2008-04-02 2009-08-06 한국남동발전 주식회사 보일러의 보조 공기 조절 장치
KR101355691B1 (ko) * 2013-06-26 2014-01-28 한국남동발전 주식회사 미분기 및 이를 포함하는 석탄 연소 시스템
KR20160131924A (ko) * 2015-05-08 2016-11-16 에스엠시 가부시키가이샤 유로전환유닛
KR20190058548A (ko) * 2016-09-21 2019-05-29 메트소 플로우 컨트롤 오와이 액추에이터용 방법 및 컨트롤러
KR102582000B1 (ko) * 2023-06-16 2023-09-22 이인근 고착 현상 현장 체크 가능한 공기량 조절 장치 및 이를 포함하는 석탄 화력 발전소의 공기 공급 시스템

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