JPH0619934Y2 - Heat storage type radiant tube burner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat storage type radiant tube burner device. More specifically, the present invention provides a combustion air supply for exhausting combustion gas by alternately combusting burners at both ends of a radiant tube in a radiant tube burner, particularly a heat storage type radiant tube burner device having a waste heat recovery system. System, combustion gas exhaust system, and fuel supply system flow path switching mechanism improvement.

(Prior Art) In recent years, a preheating technique for combustion air has been developed in order to recover a considerable amount of heat from waste gas and improve thermal efficiency. For example, as shown in FIG. 4, a burner 103 having a heat storage body 102 is provided at both ends of a radiant tube 101, and these burners are alternately burned to discharge the combustion gas through the heat storage body 102 to the unburned burner side. , Heat storage body 1
A radiant tube burner that preheats combustion air using the heat of the combustion gas stored in 02 has been proposed (Industrial heating Vol.23, NO.6, P71 published by Japan Industrial Reactor Association).

Conventionally, an electromagnetic valve is generally used for switching the flow path of combustion gas and combustion air in this burner. For example, four solenoid valves 104, 105, 106, 107 are provided in the combustion air supply system and the combustion gas exhaust system, and one of the burners 103 is connected to the combustion air supply system by selectively opening and closing them, and the other burner 103 is provided. Is connected to the combustion gas exhaust system. The fuel supply system 110
Also, two solenoid valves 108 and 109 are used.

It is also conceivable to use a rotary four-way valve 207 as shown in FIG. 5 in place of many solenoid valves. This rotary four-way valve 207 has four ports 201, 202, 20 that open in all directions.
A switching valve 206 is rotatably provided in a casing 205 having 3,204, and four ports 201, 202, 20 are provided by the switching valve 206.
By selectively communicating two adjacent ports of 3,204, either the combustion air supply system or the combustion gas exhaust system is selectively connected to the burner. Even in this case, the fuel supply system has two solenoid valves 108,
109 is provided, and the fuel gas is supplied to either one of the burners 103 by switching between these two solenoid valves 108, 109.

(Problems to be solved by the invention) However, the solenoid valve is expensive, and especially the solenoid valve that can be used in a high temperature atmosphere is expensive, which increases the equipment cost. Moreover, since the solenoid valve for gas piping is quite large, there is a problem in that it takes up space if six solenoid valves are mounted as shown in FIG. In particular, in the case of burners such as radiant tube burners that are used with several tens to several hundreds mounted around the furnace body, there is a problem that space is taken up and piping and the like are complicated to deteriorate maintenance and installability. is there.

Moreover, in the case of the heat storage type radiant tube burner which requires frequent switching of the flow at intervals of 20 seconds to 5 minutes, the installation of a large number of solenoid valves increases the occurrence rate of malfunction due to failure.

Further, even when the rotary four-way valve is used, at least two electromagnetic valves 108 and 109 are required in the fuel supply system. Since the solenoid valves 108 and 109 are used in a number that is not so ridiculous as a whole, the solenoid valves 108 and 109 still have the same problems in terms of cost, mounting space, malfunctions due to failures, and the like.

Therefore, an object of the present invention is to provide a heat storage type radiant tube burner device which eliminates an electromagnetic valve from a flow path system that is frequently switched, and has a flow path switching mechanism that saves space and has a small number of parts.

(Means for Solving Problems) In order to achieve such an object, the heat storage type radiant tube burner device of the present invention selects a combustion air supply system and a combustion gas exhaust system for the burners at both ends of the radiant tube. A rotary four-way valve that is electrically connected, a rotary three-way valve that switches the fuel supply system of the burner to supply fuel to one of the burners, and a rotary actuator that are arranged coaxially to connect each shaft, The four-way valve and the three-way valve can be simultaneously switched by a rotary actuator.

(Operation) The three-way valve and the four-way valve are simultaneously driven by a common drive source, that is, a rotary actuator. Therefore, at the same time that the combustion air supply system and the fuel supply system are connected to one burner, the fuel supply to the other burner is stopped, and the other burner is connected to the combustion gas exhaust system.

(Embodiment) Hereinafter, the configuration of the present invention will be described in detail based on an embodiment shown in the drawings.

As shown in FIG. 1, this radiant tube burner device includes a radiant tube 1, burners 3 and 3 respectively installed at both ends thereof, and a burner shell 5 of each burner 3 and 3.
A heat storage body 2 provided inside, a rotary four-way valve 8 for selectively connecting the burners 3 and 3 to a combustion air supply system 9 and a combustion gas exhaust system 10, and a fuel supply system to the burners 3 and 3. Thirteen
Is selectively connected to supply fuel to either one of the burners 3 and a rotary three-way valve 7 and a pilot burner 6. The burners 3 and 3 are alternately burned to discharge the combustion gas from the non-burning side of the burner through the heat storage body 2, while the burner on the burning side is preheated through the heat storage body 2 for combustion air. To supply.

The heat storage body 2 is for collecting and storing the sensible heat of the combustion gas that has passed through the radiant tube 1, and is generally made of a honeycomb ceramic or the like made of a material that does not react with the combustion gas or adversely affect the combustion air. Use is preferred. The heat storage body 2 is installed upstream of the ejection port of the burner gun 4, for example, inside the burner shell 5 so as to surround the burner gun 4, or outside the burner shell 5, although not preferable. Reference numeral 2a is an auxiliary heat storage body that is also inserted into the bang portion 1a of the radiant tube 1 and that also serves as a heat insulating protection cylinder.

A rotary four-way valve 8 is provided on the burner shell 5 of both burners 3 and 3.
The combustion air supply system 9 and the combustion gas exhaust system 10 are connected via the. By operating the rotary four-way valve 8, the combustion air supplied from the forced air blower 11 of the combustion air supply system 9 is supplied to one of the burners 3 and burned, while this combustion gas stores heat in the other burner 3. It is provided so as to be attracted and exhausted by the exhaust blower 12 via the body 2. Switching the flow of combustion air and combustion gas
The measurement is performed at regular intervals using a timer (not shown), or when the temperature of the combustion gas that has passed through the heat storage body 2 is measured by a thermosensor (not shown) and the temperature reaches a predetermined temperature.

The rotary four-way valve 8 supports a valve body 15 having four connection ports 8A to 8D at equal intervals, a rotary valve element 16 that rotates in the valve body 15 to switch the flow path, and a rotary valve element 16 that supports the rotary valve element 16. And a shaft 17 that is rotatably supported by the valve main body 15. Rotary valve 16
Consists of one plate having a shape that is substantially similar to the axial cross-sectional shape of the valve body 15, and includes four connection ports 15A of the valve body 15,
It is provided so as to partition the inside of the valve main body 15 so that two of each of 15B, 15C, and 15D communicate with each other. In addition, the part of the rotary valve element 16 that is in sliding contact with the inner peripheral surface 15E of the valve body 15 has no material change even if it comes into contact with the exhaust combustion gas, and is in sliding contact with the inner peripheral surface 15E of the valve body 15. A clearance setting member 18, which is made of a material that wears at the time to form a certain clearance, such as carbon, molded glass wool, refractory board material, asbestos, or a high-temperature heat insulating material such as ceramic, is buried. Furthermore,
The shaft 17 which is the center of rotation of the rotary valve 16 is
The valve body 15 is passed through, one end of which is connected to the shaft 22 of the rotary three-way valve 7 and the other end of which is the actuator 2
3 shaft (operating shaft) 24.

The rotary three-way valve 7 is a rotary valve 2 having an elport 19.
Three ports 21A, 21B, 21C at 0 and 90 ° intervals
And a valve body 21 having The rotary valve 20 is rotatably accommodated in the valve body 21, and is driven by the rotation of the shaft 22 fixed to the central portion. A fuel supply system 13 is connected to the burner gun 4 via the rotary three-way valve 7. The fuel supply system 13 is provided with a solenoid valve 14 for shutting off the fuel supply when the burners 3, 3 are stopped.

The rotary actuator 23 is an actuator that performs a rotary reciprocating motion in which the angle of the rotary motion of the shaft 24 is limited to 360 ° or less by a fluid pressure such as air pressure or hydraulic pressure, or electric energy, and is generally called a rotary torque actuator or the like. ing. Although this rotary actuator is not shown, for example, by applying air pressure to one port, the rotor is rotated 90 °,
It is provided so as to rotate in the opposite direction by 90 ° by applying air pressure in the opposite direction to the other port.

The rotary four-way valve 8, the rotary three-way valve 7 and the rotary actuator 23 are arranged coaxially and each shaft 1
7, 22, 24 are connected to each other. That is, the shaft 17 that passes through the center of the rotary valve element 16 of the four-way valve 8, the shaft 22 that passes through the center of the rotary valve element 20 of the three-way valve 7 and the shuffle 28 of the fuctuator 23 are coaxially arranged and fixed. , And is rotated by the rotary actuator 23. The rotary actuator 23 causes the rotary four-way valve 8 and the rotary three-way valve 7 to rotate in the same direction by the same angle. Therefore, the four-way valve 8 and the three-way valve 7 are arranged in such a positional relationship that the burner 3 connected to the fuel supply system 13 and the burner 3 connected to the combustion air supply system 9 are the same, and the valve main body 15 is mutually connected. , 21 are connected to each other.

With the configuration as described above, the four-way valve 8 and the three-way valve 7 are simultaneously switched by the operation of the rotary actuator 23, and the combustion air and the fuel gas are supplied to one burner 3 while the other burner 3 is supplied. The combustion gas can be exhausted by stopping the supply of the fuel gas and the combustion air to the.

(Effects of the Invention) As is clear from the above description, the heat storage type radiant tube burner device of the present invention has the rotary three-way valve, the rotary four-way valve, and the rotary actuator arranged coaxially to operate simultaneously by one rotary actuator. Since this is done, the number of parts is small, there are few failures, and the operation is reliable. Moreover, the cost can be reduced because an expensive solenoid valve is not used. Furthermore, since the actuator, the four-way valve and the three-way valve are stacked coaxially, the burner circumference can be simplified without taking up space.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a heat storage type radiant tube burner device of the present invention. FIG. 2 is a front view of a flow path switching mechanism portion which is a main part of the present invention. FIG. 3 (A) is a schematic diagram showing the structure of a rotary four-way valve, and FIG. 3 (B) is a schematic diagram showing the structure of a rotary three-way valve. FIG. 4 is a schematic view showing an embodiment of a conventional heat storage type radiant tube device. FIG. 5 is a schematic view showing another embodiment of the conventional heat storage type radiant tube device. 1 ... Radiant tube, 3, 3 ... Burner, 7 ... Rotary three-way valve, 8 ... Rotary four-way valve, 9 ... Combustion air supply system, 10 ... Combustion gas exhaust system, 13 ... Fuel supply system , 23 ... Rotary actuator.

Claims (1)

[Scope of utility model registration request] 1. A radiant tube burner device in which burners are installed at both ends of a radiant tube burner, respectively, and when one burner supplies combustion air and fuel, the other burner is stopped to exhaust combustion gas. A rotary four-way valve that selectively switches between a combustion air supply system and a combustion gas exhaust system of the burner, a rotary three-way valve that switches the fuel supply system of the burner to supply fuel to one of the burners, and a rotary actuator. Is arranged coaxially and each shaft is connected, and the four-way valve and the three-way valve can be simultaneously switched by the rotary actuator, a heat storage type radiant tube burner device.