WO2017133316A1 - Procédé, dispositif et système de commande automatique pour déterminer la quantité d'admission d'air pour cuisson opposée - Google Patents

Procédé, dispositif et système de commande automatique pour déterminer la quantité d'admission d'air pour cuisson opposée Download PDF

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Publication number
WO2017133316A1
WO2017133316A1 PCT/CN2016/109029 CN2016109029W WO2017133316A1 WO 2017133316 A1 WO2017133316 A1 WO 2017133316A1 CN 2016109029 W CN2016109029 W CN 2016109029W WO 2017133316 A1 WO2017133316 A1 WO 2017133316A1
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Prior art keywords
amount
air
determining
combustion
air intake
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PCT/CN2016/109029
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English (en)
Chinese (zh)
Inventor
李金晶
付俊杰
赵振宁
韩志成
张清峰
焦开明
李乐义
赵计平
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North China Electric Power Research Institute Co Ltd
State Grid Corp of China SGCC
Original Assignee
North China Electric Power Research Institute Co Ltd
State Grid Corp of China SGCC
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Priority claimed from CN201610074043.3A external-priority patent/CN105485714B/zh
Priority claimed from CN201610073136.4A external-priority patent/CN105605608A/zh
Priority claimed from CN201610073164.6A external-priority patent/CN105509035B/zh
Application filed by North China Electric Power Research Institute Co Ltd, State Grid Corp of China SGCC filed Critical North China Electric Power Research Institute Co Ltd
Publication of WO2017133316A1 publication Critical patent/WO2017133316A1/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/18—Details; Accessories
    • F23C10/20—Inlets for fluidisation air, e.g. grids; Bottoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught

Definitions

  • the invention relates to a control technology for operating air volume of a boiler combustion system, in particular to a method, a device and an automatic control system for determining the amount of air entering a combustion engine.
  • the combustion methods in large-scale pulverized coal combustion boilers mainly include four-corner tangential combustion and front and rear wall hedging combustion.
  • the front and rear wall-floating combustion boilers have become the main combustion mode adopted by supercritical boilers because of their advantages in combustion stability and heating surface layout.
  • the swirl burner is arranged on the front wall of the furnace and the water wall of the rear wall, and each burner separately organizes the air distribution and the flame is relatively independent; between the flames of the burners on the same wall Without disturbing each other, the burner flame tails on the front and rear walls are folded upwards in the middle of the furnace.
  • This type of combustion has the advantage that the heat load distribution on the furnace section is relatively uniform, but compared with the four-corner tangential combustion method under the same furnace burnout height, the smoke in the later stage of the method is poorly mixed, and the flue gas stroke is relatively Shorter, if the combustion air can not be fed in time and fully mixed with the fuel, it will delay the combustion process of the fuel and affect the heat absorption of the furnace.
  • the conventional pulverized coal boilers are generally large low NO x combustion technology, in conjunction with FIG. 1, a conventional low NO x combustion technology by separate overfire air, the primary combustion zone and the burn construct a zone between the reduction zone by the primary combustion zone under reducing oxygen gas produced by combustion in the primary combustion zone of the combustion of a small amount of the NO x reduction, to further reduce NO x emissions.
  • the solutions adopted by the prior art mainly include: the front and rear wall hedging type boilers are divided into two groups by the long-side symmetrical center line of the boiler, and each group has 4-5 burning winds. Nozzles; each group of burnout wind nozzles emits a burnout wind center line tangent to the same imaginary ellipse, and the two sets of ellipse rotate in opposite directions, one for counterclockwise rotation and the other for clockwise rotation. Since the burnout wind adopts the tangential combustion method, there is residual rotation of the flue gas at the exit of the furnace, which causes uneven distribution of the temperature and composition of the flue gas, which is disadvantageous for the arrangement of the heated surface and the denitration of the flue gas.
  • the burn-out wind structure is an intermediate direct current and an external swirl structure
  • more than six pulverized coal burners and burnout winds are symmetric surfaces of the furnace center. Symmetrical and evenly connected to the front and rear walls of the boiler furnace.
  • the burnout winds on both sides burn out the wind on the sides
  • the burnout wind in the middle burns the wind in the middle.
  • the opening of the intermediate DC and external swirling sides of the side-burning wind is 100%
  • the opening of the intermediate flow of the middle-burning wind is 80%
  • the opening of the external swirling plate is 10%.
  • the same level of burnout wind opening on the small side of the middle is artificially set.
  • the method of adjustment is lack of theoretical basis and space for re-optimization according to actual conditions.
  • the present invention solves the conventional hedge low NO x combustion technologies exist difference fuel flexibility, it can not determine the amount of overfire air combustion boiler hedge question based on the total amount of fuel to the furnace wall, and thus presents a combustion air flow into the hedge Method, device and automatic control system are determined.
  • An embodiment of the present invention provides a method for determining the amount of inward combustion air, wherein the determining method includes: determining a hedging combustion operation oxygen amount, a main combustion zone excess air coefficient, and a burnout air volume distribution coefficient of each floor of the burnout bellows; The amount of total fuel supplied to the furnace wall of the windbox, the analysis data of the coal quality entering the furnace, the oxygen consumption of the hedging combustion operation, the excess air ratio of the main combustion zone, and the distribution coefficient of the burnout air volume determine the amount of inward combustion air.
  • the embodiment of the invention further provides a device for determining the amount of intake air entering the combustion, wherein the determining device comprises: an operating oxygen amount and coefficient determining unit for determining the amount of oxygen in the hedging combustion operation, the excess air coefficient in the main combustion zone, and the combustion rate per layer
  • the exhaust air volume distribution coefficient of the exhaust air box configured to analyze the total fuel amount, the analysis data of the incoming coal quality according to the furnace wall where the burning bellows is located, and the oxygen consumption of the hedging combustion operation, the main combustion
  • the zone excess air coefficient and the burnout air volume partition coefficient determine the amount of the hedging combustion air intake.
  • the embodiment of the present invention further provides an automatic control system for the combustion air intake amount, comprising: an air intake amount detecting device, an air intake amount control device, and the above-mentioned determining device for the amount of the inward combustion air inlet; the air intake amount detecting device is disposed at the burnout At the entrance of the wind box, the air intake amount control means is configured to determine, according to the actual intake air amount obtained by the air intake amount detecting means and the air intake amount determining means in the determining means for the hedging combustion air intake amount, the amount of the hedging combustion air volume determined by the air intake amount determining means The amount of air at the entrance to the burnout bellows is controlled.
  • the beneficial effects of the embodiments of the present invention are: determining the total fuel amount, the analysis data of the coal quality entering the furnace, the oxygen consumption of the hedging combustion, the excess air coefficient of the main combustion zone, and the distribution coefficient of the burned air volume by the furnace wall where the windbox is burned out.
  • hedge combustion air intake amount to achieve automatic control of air flow into the hedge low NO x combustion boiler operation during the process, while maintaining the furnace exit is the NO x concentration at a low level at the same time to ensure efficient combustion.
  • FIG 1 is a configuration diagram of a boiler furnace low NO x combustion technologies (a) employed in the prior art.
  • Figure 2 shows, by way of example, a flow chart of a method of determining the amount of incoming combustion air.
  • Figure 3 shows, by way of example, a flow chart of a method of determining the amount of oxygen in a hedge combustion operation.
  • FIG. 4 shows a graph of the NO x concentration and CO concentration and the operating hedge combustion oxygen inlet flue gas denitrification.
  • Figure 5 shows, by way of example, a graph of the amount of oxygen in the hedging combustion operation.
  • Fig. 6 shows, by way of example, a block diagram of a hedging combustion operation oxygen quantity automatic control system.
  • Figure 7 shows, by way of example, a boiler block diagram of an automatic control system for the operation of a hedging combustion operation.
  • Figure 8 shows, by way of example, a flow chart of the automatic control of the hedging combustion operation oxygen volume automatic control system.
  • Figure 9 shows, by way of example, a flow chart of a method of determining the amount of incoming air.
  • FIG 10 is a configuration diagram of a boiler furnace low NO x combustion technologies (II) employed in the prior art.
  • Fig. 11 shows a block diagram of the intake air volume automatic control system by way of example.
  • Fig. 12 shows, by way of example, a block diagram of an intake air volume automatic control system disposed in a swirl burner.
  • Figure 13 shows, by way of example, a flow chart for the automatic control of the intake air volume automatic control system.
  • Fig. 14 shows, by way of example, a flow chart of the intake air volume automatic control system automatically controlling the inlet of the secondary bellows.
  • Fig. 15 shows, by way of example, a structural view of a device for determining the amount of incoming combustion air.
  • Fig. 16 shows, by way of example, a block diagram of an automatic combustion air intake control system.
  • Fig. 17 shows, by way of example, a schematic view of the installation position of the burnout bellows.
  • Fig. 18 shows, by way of example, a flow chart of the automatic control of the amount of intake air of the burnout bellows by the automatic combustion air intake amount control system.
  • the embodiment of the invention provides a method, a device and an automatic control system for determining the amount of air entering the combustion.
  • the invention will be described in detail below with reference to the accompanying drawings.
  • the method for determining the amount of air entering the combustion of the embodiment of the present invention mainly includes:
  • Step 21 determining the amount of oxygen in the combustion operation, the excess air ratio in the main combustion zone, and the burnout wind of each floor of the burnout bellows Quantity allocation coefficient.
  • the burn-through air volume distribution coefficient can generally take values in the range of 0 to 1, and the specific value can be determined by the combustion adjustment test, and the following formula is also satisfied:
  • x j represents the burn-in air distribution coefficient of the j-th floor burn-out bellows
  • n represents the total number of layers of the burn-out bellows.
  • the excess air coefficient of the main combustion zone can generally be in the range of 0.8 to 0.95, and the specific value can be determined by the combustion adjustment test.
  • the amount of the hedge combustion intake air may be determined as the designed minimum ventilation amount of the burnout bellows.
  • the process of determining the oxygen consumption of the hedging combustion operation may include:
  • Step 211 CO concentration in the flue gas inlet of the denitration obtain a predetermined operating point, and in the NO x concentration.
  • Step 212 determining when the slope of the curve when the NO x concentration in front of the CO concentration in the flue gas denitration system is less than a predetermined value.
  • the slope of the curve can be determined by the following formula:
  • Formula j represents oxygen according to the operational conditions point number from small to large are arranged; n-represents the total number of operating points; K j represents the NO x concentration corresponding to the j-th operating point change with flue gas oxygen content of the operation slope; O 2, j denotes the j-th operation point corresponding to the amount of oxygen in the flue gas; C j represents the NO x concentration corresponding to the j-th operating point of the flue gas converted to a value at 6% oxygen.
  • the j-th operation point corresponding to the NO x concentration in the flue gas converted to a value at 6% oxygen content may be determined by the following equation:
  • Step 213 determining the amount of oxygen for the hedging combustion operation according to the corresponding operating oxygen value when the slope of the curve reaches a minimum value.
  • the oxygen consumption of the hedging combustion under three stable loads, the correspondence between the oxygen consumption of the hedging combustion operation and the boiler load can be obtained, thereby determining the oxygen consumption of the hedging combustion operation.
  • CO is less than 600mg/m 3
  • the first five rows of data are selected, and the corresponding k j values are calculated as shown in the last column of the table.
  • the optimal operating oxygen amount under the load is determined to be 3.25%.
  • the main steam flow of the boiler is the boiler load.
  • the current boiler load (main steam flow) is 1200t/h, between (950, 5.7) and (1440, 3.5) in Figure 4, there are:
  • the amount of oxygen in the combustion operation of the boiler during the steady operation of any load in the test load section can be determined by the negative
  • the at least one operating oxygen value of the load is determined by interpolation. Since the oxygen content of the hedging combustion is generally only related to the coal quality of the boiler, it can be set to be re-acquired only when the coal quality of the boiler changes greatly.
  • the process of determining the oxygen consumption of the combustion operation in the above steps 211 to 213 can be realized by a hedging combustion operation oxygen amount automatic control system as shown in FIG. 6.
  • the hedging combustion operation oxygen amount automatic control system includes: a supply air control device 61, a denitration device 62, and a device 63 for determining the amount of oxygen for the operation of the combustion.
  • the operation of determining the oxygen content of the combustion apparatus hedge 63 comprising: determining a concentration unit, and the slope of the curve determining unit operation determination unit oxygen concentration determining means for the flue gas inlet CO concentration denitration obtain a predetermined operating point of the NO x and a concentration; a curve slope determining unit is configured to determine a curve slope of the NOx concentration when the CO concentration in the denitration inlet flue gas is less than a predetermined value; and the operating oxygen amount determining unit is configured to perform a corresponding operation according to the slope of the curve reaching a minimum value The oxygen value determines the oxygen content of the hedging combustion operation.
  • the denitration device 62 is configured to perform denitration treatment on the boiler flue gas, and the concentration determining unit in the device 63 for determining the oxygen consumption of the hedging combustion operation is disposed at the flue gas inlet of the denitration device 62, and the air supply control device 61 is configured to operate according to the determined hedging combustion.
  • the amount of oxygen supplied by the operating oxygen amount determining unit in the oxygen amount determining means 63 determines the amount of blown air.
  • the air supply control device 61 includes:
  • the oxygen input module is operated to obtain the current operating oxygen amount of the predetermined boiler.
  • a comparison module configured to determine a comparison result between the current operating oxygen amount and the amount of hedging combustion operation determined by the operating oxygen amount determining unit;
  • a wind control module configured to control the air supply amount according to the comparison result.
  • the present embodiment provides an automatic control system for the oxygenation operation of the hedging combustion system, which is disposed in the boiler equipped with the control device as shown in FIG. .
  • the boiler is provided with a furnace-based low NO x combustion technology 71, economizer 72, an air preheater 73 and the blower 74; denitration apparatus 62 disposed hedge oxygen combustion operation in the automatic control system economizer and air preheater 72 Between the injectors 73, an oxygen content monitoring point 75 is provided at the flue gas inlet of the denitration device 62, and the air supply control device 61 is connected to the blower 74 for controlling the amount of air blown by the blower 74.
  • the air volume of the blower 74 can be adjusted by means of a variable frequency motor, a fan blade or a fan outlet baffle.
  • Figure 8 shows the automatic control flow of the automatic combustion control oxygen control system proposed in the present embodiment.
  • the operating oxygen value under 3-5 stable load conditions is determined according to the input current load of the boiler, and then interpolated.
  • the method determines the operating oxygen quantity O 2 * of the boiler, and then determines the comparison result (O 2 * -O 2 ) between the current operating oxygen amount O 2 of the input boiler and the optimal operating oxygen amount O 2 * of the boiler, and finally controls the blower according to the comparison result.
  • the amount of air delivered is determined according to the input current load of the boiler, and then interpolated.
  • the method determines the operating oxygen quantity O 2 * of the boiler, and then determines the comparison result (O 2 * -O 2 ) between the current operating oxygen amount O 2 of the input boiler and the optimal operating oxygen amount O 2 * of the boiler, and finally controls the blower according to the comparison result.
  • the amount of air delivered is the amount of air delivered.
  • the air supply volume of the blower is reduced;
  • the comparison between the current operating oxygen amount and the boiler operating oxygen amount is less than the preset oxygen content deviation - ⁇ (O 2 -O 2 * ⁇ - ⁇ )
  • the blower air supply amount is increased.
  • the preset oxygen content deviation ⁇ can be determined according to the actual fluctuation amplitude of the measurement point indication of the oxygen content monitoring point 75.
  • the step 22 is performed.
  • the amount of hedging combustion air is determined according to the total fuel amount, the analysis data of the coal quality, and the oxygen consumption of the combustion combustion, the excess air ratio of the main combustion zone and the exhaust air volume distribution coefficient.
  • the analysis data of the coal quality into the furnace may include: a mass fraction of the received carbon element in the coal quality, a mass fraction of the received base sulfur element, a mass fraction of the received hydrogen element, and a mass fraction of the received oxygen element.
  • the amount of this inward combustion airflow can be determined by the following formula:
  • V i,j represents the amount of inward combustion air intake of the jth floor burnout bellows of the i-th furnace wall
  • x j represents the burnout air volume distribution coefficient of the jth floor burnout bellows
  • O 2 represents the hedging combustion operation oxygen amount.
  • ⁇ c represents the excess air coefficient
  • C represents the mass fraction of the received base carbon in the coal
  • S represents the mass fraction of the received base sulfur in the coal
  • H represents the received hydrogen element in the coal.
  • O represents the mass fraction of the received oxygen element in the coal quality
  • M i represents the total amount of fuel fed into the i-th furnace wall where the blown bellows is located.
  • the technical solution is provided by using the specific embodiment, and the total fuel amount, the analysis data of the coal quality entering the furnace, the oxygen consumption in the combustion combustion, the excess air coefficient in the main combustion zone, and the distribution coefficient of the burned air volume are determined by the furnace wall in which the windbox is burned. combustion air flow into the hedge, while maintaining the furnace exit is the NO x concentration at a low level at the same time to ensure efficient combustion.
  • the hedging of the embodiment of the present invention is performed before the step 22 is performed.
  • the method for determining the amount of combustion air intake may further comprise the steps of determining the air intake amount of the coal mill and the air intake amount of the secondary air box, as shown in FIG. 9, the steps mainly include:
  • step 91 the air intake amount of the coal mill is determined according to the coal supply amount of the coal mill and the ratio of the coal to the coal quality.
  • the amount of air intake can be determined by the following formula:
  • V p k p ⁇ M
  • V p in the formula represents the amount of primary air intake of the coal mill in t/h;
  • k p represents the ratio of wind to coal in the coal, which is related to the type of coal entering the furnace.
  • the range of k p is 1.6-1.8, for lignite, the value of k ranges from 1.8 to 2.0, etc.
  • the specific value can be determined by the performance test of the coal mill;
  • M represents the coal supply amount of the coal mill, and the unit is t/h.
  • the primary air intake of the coal mill may be determined as the minimum ventilation of the coal mill design.
  • step 92 the air volume of the secondary air box at the inlet of the wind box provided with the burner is determined according to the analysis data of the coal quality entering the furnace, the coal supply amount of the coal mill, and the air intake amount.
  • the air volume of the secondary bellows can be determined by the following formula:
  • V s ⁇ [0.089(C+0.375S)+0.265H-0.0333O] ⁇ MV p ,
  • V s represents the air volume of the secondary bellows
  • ⁇ represents the excess air coefficient
  • C represents the mass fraction of the received base carbon in the coal
  • S represents the mass fraction of the received base sulfur in the coal
  • H represents as received coal into the furnace of a hydrogen element content
  • M is the mill coal feed rate
  • V p represents an amount of time into the wind.
  • the excess air coefficient ⁇ is decreased by a predetermined ratio as the number of layers of the secondary windbox increases, and can be determined, for example, by the following formula:
  • the k s in the formula represents the oxygenation coefficient, and the value range is usually 0.10-0.45.
  • the actual value can be determined by the combustion adjustment test;
  • the excess air ratio ⁇ can also be determined by the following formula:
  • ⁇ 0 represents a predetermined constant, and in general, the value may be 1.05; k s represents an under-oxidation coefficient, and the range of values may be determined according to a function form actually used; p represents a predetermined power exponent, which is generally a constant.
  • the air volume of the secondary air box is determined as the minimum secondary air volume of the design of the burner.
  • the process of the air intake of the coal mill and the air intake of the secondary air box of the above steps 91 to 92 can be realized by an automatic air intake control system as shown in FIG. 11 , and the air intake automatic control system
  • the primary air volume detecting device 101 is disposed at the air inlet of the coal mill, and the primary air volume control device 102 is configured to detect the actual primary air volume obtained by the primary air volume detecting device 101 and the primary air volume determining unit determined by the primary air volume determining unit in the device 105 for determining the air intake amount.
  • the air volume controls the air volume at the air inlet of the coal mill, the secondary air volume detecting device 103 is disposed at the inlet of the wind box, and the secondary air volume control device 104 is configured to determine the actual secondary air volume obtained by the secondary air volume detecting device 103 and determine the progress.
  • the air volume of the secondary air duct determined by the secondary air volume determining unit in the air volume device 105 controls the air volume at the entrance of the wind box.
  • the primary air volume control device 102 includes:
  • a primary air volume input module for obtaining an actual primary air volume at the air inlet of the coal mill
  • a comparison module configured to determine a comparison result between the actual primary air volume and the primary air volume determined by the primary air volume determining unit
  • a wind control module for adjusting the actual primary air volume based on the comparison result.
  • the secondary air volume control device 104 includes:
  • a secondary air volume input module for obtaining an actual secondary air volume at a burner fuel inlet
  • a second comparison module configured to determine a comparison result between the actual secondary air volume and the secondary air box air intake amount determined by the secondary air volume determining unit
  • the secondary wind control module is configured to adjust the actual secondary air volume according to the comparison result.
  • the present embodiment proposes an automatic air intake amount control system which is disposed in the swirl burner as shown in FIG.
  • the swirl burner includes a coal mill 51 and a bellows 53 provided with a burner 52.
  • the primary air volume detecting device 101 is disposed at an air inlet of the coal mill 51, and the primary air volume control device 102 detects the air volume detecting device 102 according to the primary air volume detecting device 101.
  • the actual primary air volume and the primary air volume determining unit in the device 105 for determining the air intake amount determine the primary air intake amount, and the air volume at the air inlet of the coal mill 51 is controlled by the primary air baffle 54, and the secondary air volume detecting device 103 is disposed in the wind box.
  • the secondary air volume control device 104 detects the actual secondary air volume obtained by the secondary air volume detecting device 103 and the secondary air volume of the secondary air volume determining unit in the device 105 that determines the air intake amount, and passes the second air volume.
  • the secondary air baffle 55 controls the amount of wind at the inlet of the air volume of the bellows 53.
  • the primary air volume V 1 at the air inlet of the coal mill is obtained by the primary air volume input module, and the comparison result of the actual primary air volume V 1 and the primary air intake amount V p is determined by a comparison module. If the comparison result is greater than a predetermined air amount deviation ⁇ 1 (i.e., V 1 -V p> ⁇ 1) , the control module controls the wind by a primary air shutter 54 is closed to reduce the actual small amount of wind V 1; and if the result is less than The negative value of the preset air volume deviation - ⁇ 1 (ie, V 1 -V p ⁇ - ⁇ 1 ), the primary wind deflector 54 is controlled by the primary wind control module to increase the actual primary air volume V 1 ; if the comparison result is The preset air volume deviation ⁇ 1 and the negative value of the preset air volume deviation - ⁇ 1 (ie, ⁇ 1 >V 1 -V p >- ⁇ 1 ) eliminate the need to adjust the primary air baffle 54.
  • the preset air volume deviation ⁇ 1 may be determined based on the actual volatility of the actual amount of wind V 1 shows the number of measuring points.
  • Figure 14 shows the secondary air intake automatic control flow of the air intake automatic control system proposed in the present embodiment.
  • the under-oxidation coefficient k s , the number of layers in the secondary air box x, and the total number of secondary air boxes are determined according to the combustion adjustment experiment.
  • the number of layers N is calculated and the excess air coefficient ⁇ is calculated.
  • the secondary air volume determining unit calculates the primary air inlet amount V p according to the primary air volume determining unit and calculates the secondary air box air intake amount V s in combination with the excess air coefficient ⁇ and the analysis data of the incoming coal quality.
  • the analysis data of the coal quality entering the furnace may include the mass fraction C of the received carbon element in the coal quality, the mass fraction S of the received base sulfur element in the coal quality, and the quality of the received hydrogen element in the coal quality
  • the secondary air box inlet air amount V s calculated at this time is greater than the designed minimum ventilation amount V s0 of the burner, the secondary air box inlet air amount V s determined at this time is determined as the secondary air box inlet air amount V s ;
  • the calculated secondary air box inlet air volume V s is smaller than the designed minimum ventilation amount V s0 of the burner, and the designed minimum ventilation amount V s0 of the burner is determined as the secondary air box inlet air amount V s .
  • the actual secondary air volume V 2 at the inlet of the wind box is obtained by the secondary air volume input module, and the comparison result of the actual secondary air volume V 2 and the secondary air box inlet air amount V s is determined by the secondary comparison module. If the comparison result is greater than the preset air volume deviation ⁇ 2 (ie, V 2 -V s > ⁇ 2 ), the secondary wind control 55 is controlled to be closed by the secondary wind control module to reduce the actual secondary air volume V 2 ; If the comparison result is less than the negative value of the preset air volume deviation - ⁇ 2 (ie, V 2 - V s ⁇ - ⁇ 2 ), the secondary wind control panel is controlled by the secondary wind control module to increase the actual primary air volume V 2 .
  • the preset air volume deviation ⁇ 2 can be determined according to the actual fluctuation amplitude of the actual secondary air volume V 2 measurement point.
  • the embodiment also provides a device for determining the amount of intake air entering the combustion.
  • the device for determining the amount of intake air entering the combustion includes:
  • the operating oxygen amount and coefficient determining unit 1501 is configured to determine a hedging combustion operation oxygen amount, a main combustion zone excess air coefficient, and a burnout air volume distribution coefficient of each floor of the burnout bellows;
  • the intake air amount determining unit 1502 is configured to, according to the total fuel amount, the analysis data of the incoming coal quality, and the hedging combustion operation oxygen amount, the main combustion zone excess air coefficient, and the burning according to the furnace wall where the burning bellows is located.
  • the exhaust air volume distribution coefficient determines the amount of the hedging combustion air intake.
  • operation of oxygen and coefficient determination unit 1501 may determine each overfire windbox overfire air distribution coefficient, and NO x when the concentration of CO in the flue gas inlet of the denitration than a predetermined value by the total number of layers in accordance with when the overfire air tank
  • the slope of the curve of the concentration determines the amount of oxygen that is hedged for combustion operation.
  • the intake air volume determining unit 1502 can calculate the hedging combustion according to the total fuel amount, the analysis data of the coal quality entering the furnace, the oxygen consumption of the hedging combustion, the excess air coefficient of the main combustion zone, and the exhaust air volume distribution coefficient. Air intake. If the determined amount of hedging combustion air intake is less than the designed minimum ventilation amount of the burnout bellows, the amount of hedging combustion air intake may be determined as the designed minimum ventilation amount of the burnout bellows.
  • the technical solution is provided by using the specific embodiment, and the total fuel amount, the analysis data of the coal quality entering the furnace, the oxygen consumption in the combustion combustion, the excess air coefficient in the main combustion zone, and the distribution coefficient of the burned air volume are determined by the furnace wall in which the windbox is burned. combustion air flow into the hedge, while maintaining the furnace exit is the NO x concentration at a low level at the same time to ensure efficient combustion.
  • the present embodiment also proposes an automatic control system for the combustion air intake amount, which, as shown in FIG. 16, includes: an air intake amount detecting device 1601, an air intake amount control device 1602, and a hedging combustion air intake amount as described in the above specific embodiment.
  • the determining device 1603; the intake air amount detecting device 1601 is disposed at the inlet of the burning air box, and the air intake amount controlling device 1602 is configured to detect the actual air intake amount obtained by the air intake amount detecting device 1601 and the air intake amount in the determining device 1603 for the amount of the combustion air intake.
  • the amount of hedging combustion air determined by the determining unit 1502 controls the amount of wind at the inlet of the burnout bellows.
  • the air volume control device 1602 includes:
  • An air intake input module for detecting an actual intake air volume at the entrance of the burnout bellows
  • a comparison module configured to determine a comparison result of the actual intake air amount and the amount of the inward combustion air amount determined by the intake air amount determining unit;
  • the air volume control module is configured to adjust the actual air intake amount according to the comparison result.
  • the air volume control module includes:
  • the air volume adjustment submodule is configured to reduce the actual air intake amount when the comparison result is greater than the preset air volume deviation value, and increase the actual air intake amount when the comparison result is less than the negative value of the preset air volume deviation value.
  • the present embodiment proposes an automatic control system for the hedging combustion intake air, which system is disposed in the counter-fired boiler shown in FIG.
  • the counter-fired boiler includes No. 1 furnace wall and No. 2 furnace wall, and a C-layer coal pulverizer, a D-layer coal pulverizer, an E-layer coal pulverizer, and a first-layer burnout bellows are arranged on the No. 1 furnace wall.
  • x 1,1 and 2nd floor burnout bellows x 1,2 A layer coal mill, B layer coal mill, F layer coal mill, 1st floor burnout bellows on the 2nd furnace wall 2, 1 and 2nd floor burnout bellows x 2,2 .
  • the burnout wind can be sent in the burnout area above the reduction zone to ensure that there is a certain excess air at the furnace exit, so that the remaining combustibles in the furnace are completely burned out.
  • the burning of the wind can follow the principle of timely and high efficiency, that is, after the main reduction in the reduction zone, the burnt air is sent in time in the high temperature zone of the furnace, and the position, wind speed and mode of burning the wind can be beneficial.
  • the flammable gas and the burnout wind sent from the reduction zone are thoroughly mixed to improve the combustion efficiency.
  • the total fuel amount M i that is supplied to the furnace wall of the burning bellows may be the coal amount of the coal mill of the No. 1 furnace wall.
  • the sum of the coal feeds of the No. 2 furnace wall, that is, M 1 is the sum of the coal amount of the C, D and E layer coal mills, and M 2 is the sum of the coal amount of the A, B and F layer coal mills.
  • the actual intake air amount V at the entrance of the burnout bellows can be controlled by the burnout air baffle provided at the entrance of the wind box, and the actual intake air amount V is detected by the intake air amount detecting means 1601 provided at the inlet.
  • FIG 18 is a hedge specific embodiment proposed by the present combustion air intake amount hedge automatic control system to automatically control the combustion air intake flow, first 2, primary combustion zone excess air coefficient ⁇ is determined according to the test by adjusting the combustion oxygen combustion operation hedge O c and the burnout air volume distribution coefficient M i of each layer of the burnout bellows, and input the analysis data of the coal quality into the furnace, the analysis data may include receiving the base carbon element mass fraction C, receiving the base sulfur element mass fraction S, and receiving To the base hydrogen element mass fraction H and receive the base oxygen element mass fraction O. Finally, the total amount of fuel fed into the furnace wall of the i-th furnace can be calculated to obtain the amount of inward combustion air V i,j .
  • the actual intake air volume V at the inlet of the burnout bellows is obtained by the intake air volume input module, and the comparison module determines the comparison result of the actual intake air volume V and the hedging combustion air intake amount V i,j . If the comparison result is greater than the preset air volume deviation ⁇ (ie, VV i, j > ⁇ ), the air volume control module controls the burnout wind baffle to be closed to reduce the actual air intake amount V; if the comparison result is less than the preset air volume deviation The negative value - ⁇ (ie VV i,j ⁇ - ⁇ ), the air volume control module controls the burnout wind baffle to open to increase the actual air intake V; if the comparison result is at the preset air volume deviation ⁇ and the preset The negative value of the air volume deviation - ⁇ (ie ⁇ > VV i, j > - ⁇ ), there is no need to adjust the burnout wind baffle.
  • the minimum amount of overfire air vent tank may be designed V 0 boiler or burner design information provided.
  • the technical solution is provided by using the specific embodiment, and the total fuel amount, the analysis data of the coal quality entering the furnace, the oxygen consumption in the combustion combustion, the excess air coefficient in the main combustion zone, and the distribution coefficient of the burned air volume are determined by the furnace wall in which the windbox is burned.
  • hedge combustion air intake amount to achieve automatic control of air flow into the hedge low NO x combustion boiler operation during the process, while maintaining the furnace exit is the NO x concentration at a low level at the same time to ensure efficient combustion.
  • an embodiment of the present invention further provides a computer readable storage medium comprising computer readable instructions, when executed, causing a processor to perform at least the following operations: determining a hedging combustion operation Oxygen quantity, excess air ratio in the main combustion zone, and burnout air distribution coefficient of each floor of the burnout bellows; analysis of the total fuel amount, the analysis of the coal quality, and the oxygenation of the combustion according to the furnace wall where the blowout bellows is located The amount, the excess air ratio of the main combustion zone, and the burn-in air volume distribution coefficient determine the amount of inward combustion air intake.
  • the computer readable instructions causing the processor to determine the amount of the hedging combustion air intake comprises: if the determined amount of the hedging combustion air intake is less than the designed minimum air volume of the burnout bellows, the hedging combustion air intake amount A minimum amount of ventilation is determined for the design of the burnout bellows.
  • the above-described computer-readable instructions cause the processor to determine the amount of oxygen hedge combustion operation, comprises: CO concentration in the flue gas inlet of the denitration obtain a predetermined operating point, and in the NO x concentration; determining when the inlet flue gas denitration CO concentration of the NO x concentration curve slope is less than a predetermined value when gas; determining the hedging combustion operation in accordance with the amount of oxygen corresponding to the slope of the curve reaches a minimum when the oxygen run value.
  • the computer readable instructions cause the processor to determine the amount of oxygen for the hedging combustion operation according to the amount of operating oxygen corresponding to the slope of the curve when the slope of the curve reaches a minimum value, specifically, the operating oxygen value corresponding to the predetermined load the NO x concentration slope of the curve is minimum.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

La présente invention concerne un procédé de détermination d'une quantité d'admission d'air pour cuisson opposée, comprenant : la détermination d'une quantité opérationnelle d'oxygène de cuisson opposée, un coefficient d'air en excès dans une zone de combustion primaire, et un coefficient d'allocation de quantité d'air de cuisson pour une boîte à air de cuisson à chaque couche ; et la détermination, en fonction d'une quantité de combustible total introduite depuis une paroi de four au niveau de laquelle ladite boîte à air de cuisson est située et des données analytiques de propriétés de charbon introduit en plus de la quantité opérationnelle d'oxygène de cuisson opposée, le coefficient d'air en excès dans la zone de combustion primaire, et le coefficient d'allocation de quantité d'air de cuisson, une quantité d'admission d'air pour cuisson opposée. L'invention concerne en outre un dispositif et un système de commande automatique pour mettre en œuvre le procédé de détermination d'une quantité d'admission d'air pour cuisson opposée, une quantité d'admission d'air pendant un processus de cuisson opposée faible en NOx étant automatiquement régulée pendant le fonctionnement du four, de façon à assurer une combustion très efficace tout en maintenant un faible niveau de concentration de NOx à la sortie d'un four.
PCT/CN2016/109029 2016-02-02 2016-12-08 Procédé, dispositif et système de commande automatique pour déterminer la quantité d'admission d'air pour cuisson opposée Ceased WO2017133316A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
CN201610074043.3 2016-02-02
CN201610074043.3A CN105485714B (zh) 2016-02-02 2016-02-02 一种确定锅炉运行氧量的方法、装置及自动控制系统
CN201610073136.4A CN105605608A (zh) 2016-02-02 2016-02-02 一种确定进风量的方法、装置及自动控制系统
CN201610073136.4 2016-02-02
CN201610073164.6A CN105509035B (zh) 2016-02-02 2016-02-02 一种确定对冲燃烧进风量的方法、装置及自动控制系统
CN201610073164.6 2016-02-02

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CN110274222A (zh) * 2019-07-12 2019-09-24 合肥工业大学智能制造技术研究院 一种对冲式燃油锅炉及其炉内燃烧布置方法
CN110805924A (zh) * 2019-12-18 2020-02-18 上海电力大学 一种电站锅炉的二次风通道调节装置及燃烧数值模拟方法
CN111239360A (zh) * 2019-12-27 2020-06-05 国网河北省电力有限公司电力科学研究院 一种基于煤粉燃烧全过程烟气成分监测配风系统
CN112580250A (zh) * 2020-11-12 2021-03-30 山东纳鑫电力科技有限公司 基于深度学习的火电机组脱硝系统及优化控制方法
CN113294806A (zh) * 2021-06-16 2021-08-24 大唐淮南洛河发电厂 一种火电厂锅炉燃烧最佳氧量节能控制优化方法
CN113503534A (zh) * 2021-08-20 2021-10-15 西安热工研究院有限公司 一种四角切圆锅炉近水冷壁飞灰防结渣系统和方法
CN114354854A (zh) * 2022-01-06 2022-04-15 武汉祁联生态科技有限公司 一种烟气监测数据的异常检测方法
CN114576645A (zh) * 2022-03-25 2022-06-03 苏州西热节能环保技术有限公司 一种对冲燃煤锅炉高温受热面壁温超温主动控制方法
CN114637347A (zh) * 2022-03-23 2022-06-17 山东宏桥新型材料有限公司 脱硝烟气量确定方法、装置及脱硝喷氨量调整方法、装置
CN115076715A (zh) * 2022-05-05 2022-09-20 国能南京电力试验研究有限公司 一种降低锅炉省煤器出口co和nox浓度的控制方法
CN115289495A (zh) * 2022-07-12 2022-11-04 西安佛莱斯特电力科技有限责任公司 一种燃煤电站切圆锅炉深度燃烧优化调整方法
CN115479745A (zh) * 2022-09-19 2022-12-16 西安热工研究院有限公司 适用于前后墙对冲锅炉的冷态空气动力场测量系统
CN115738702A (zh) * 2022-11-24 2023-03-07 中国大唐集团科学技术研究院有限公司中南电力试验研究院 一种w型锅炉SCR脱硝系统喷氨优化调整方法
CN116255608A (zh) * 2023-02-27 2023-06-13 华能巢湖发电有限责任公司 一种低负荷工况下锅炉预警方法
CN116734287A (zh) * 2023-07-26 2023-09-12 苏州西热节能环保技术有限公司 一种对冲燃烧锅炉预防掉焦的调整方法
CN116928693A (zh) * 2023-07-14 2023-10-24 华能海南发电股份有限公司海口电厂 一种适用于锅炉降低低温过热器壁温的方法
CN117366564A (zh) * 2023-10-12 2024-01-09 广东红海湾发电有限公司 一种对冲燃烧补燃托举风装置

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CN105605608A (zh) * 2016-02-02 2016-05-25 华北电力科学研究院有限责任公司 一种确定进风量的方法、装置及自动控制系统
CN205316377U (zh) * 2016-02-02 2016-06-15 华北电力科学研究院有限责任公司 一种对冲燃烧燃尽风量自动控制系统及锅炉
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CN105485714A (zh) * 2016-02-02 2016-04-13 华北电力科学研究院有限责任公司 一种确定锅炉运行氧量的方法、装置及自动控制系统
CN105509035A (zh) * 2016-02-02 2016-04-20 华北电力科学研究院有限责任公司 一种确定对冲燃烧进风量的方法、装置及自动控制系统
CN105605608A (zh) * 2016-02-02 2016-05-25 华北电力科学研究院有限责任公司 一种确定进风量的方法、装置及自动控制系统
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CN110081457A (zh) * 2019-06-20 2019-08-02 吉林大学 一种预防锅炉水冷壁爆管的二次风风管装置及其控制方法
CN110081457B (zh) * 2019-06-20 2023-11-28 吉林大学 一种预防锅炉水冷壁爆管的二次风风管装置及其控制方法
CN110274222A (zh) * 2019-07-12 2019-09-24 合肥工业大学智能制造技术研究院 一种对冲式燃油锅炉及其炉内燃烧布置方法
CN110805924A (zh) * 2019-12-18 2020-02-18 上海电力大学 一种电站锅炉的二次风通道调节装置及燃烧数值模拟方法
CN111239360B (zh) * 2019-12-27 2022-06-24 国网河北省电力有限公司电力科学研究院 一种基于煤粉燃烧全过程烟气成分监测配风系统
CN111239360A (zh) * 2019-12-27 2020-06-05 国网河北省电力有限公司电力科学研究院 一种基于煤粉燃烧全过程烟气成分监测配风系统
CN112580250A (zh) * 2020-11-12 2021-03-30 山东纳鑫电力科技有限公司 基于深度学习的火电机组脱硝系统及优化控制方法
CN113294806A (zh) * 2021-06-16 2021-08-24 大唐淮南洛河发电厂 一种火电厂锅炉燃烧最佳氧量节能控制优化方法
CN113503534A (zh) * 2021-08-20 2021-10-15 西安热工研究院有限公司 一种四角切圆锅炉近水冷壁飞灰防结渣系统和方法
CN114354854A (zh) * 2022-01-06 2022-04-15 武汉祁联生态科技有限公司 一种烟气监测数据的异常检测方法
CN114354854B (zh) * 2022-01-06 2024-02-13 武汉祁联生态科技有限公司 一种烟气监测数据的异常检测方法
CN114637347A (zh) * 2022-03-23 2022-06-17 山东宏桥新型材料有限公司 脱硝烟气量确定方法、装置及脱硝喷氨量调整方法、装置
CN114576645A (zh) * 2022-03-25 2022-06-03 苏州西热节能环保技术有限公司 一种对冲燃煤锅炉高温受热面壁温超温主动控制方法
CN115076715A (zh) * 2022-05-05 2022-09-20 国能南京电力试验研究有限公司 一种降低锅炉省煤器出口co和nox浓度的控制方法
CN115289495A (zh) * 2022-07-12 2022-11-04 西安佛莱斯特电力科技有限责任公司 一种燃煤电站切圆锅炉深度燃烧优化调整方法
CN115479745A (zh) * 2022-09-19 2022-12-16 西安热工研究院有限公司 适用于前后墙对冲锅炉的冷态空气动力场测量系统
CN115738702A (zh) * 2022-11-24 2023-03-07 中国大唐集团科学技术研究院有限公司中南电力试验研究院 一种w型锅炉SCR脱硝系统喷氨优化调整方法
CN115738702B (zh) * 2022-11-24 2025-09-12 中国大唐集团科学技术研究院有限公司中南电力试验研究院 一种w型锅炉SCR脱硝系统喷氨优化调整方法
CN116255608A (zh) * 2023-02-27 2023-06-13 华能巢湖发电有限责任公司 一种低负荷工况下锅炉预警方法
CN116928693A (zh) * 2023-07-14 2023-10-24 华能海南发电股份有限公司海口电厂 一种适用于锅炉降低低温过热器壁温的方法
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