Zero-leakage heat accumulating type combustion furnace system

Abstract

The utility model discloses a zero-leakage heat accumulating type combustion furnace system. The device comprises a heat storage combustion furnace, a chimney, an air inlet system and an exhaust system, wherein the air inlet system comprises an air inlet pipeline, a flame arrester arranged on the air inlet pipeline, an adsorption fan, a plurality of branch pipelines and air inlet valves arranged on the branch pipelines respectively; the exhaust system comprises a gas outlet pipeline, an exhaust valve arranged on the gas outlet pipeline and an outlet thermocouple. The heat storage combustion furnace is further provided with a gas heat insulation type fire peeping device, a plurality of temperature transmitters and a pressure transmitter. The device has the advantages of effectively avoiding instrument failure, preventing high-temperature glass from being in a high-temperature state for a long time, prolonging the service life of the high-temperature glass, effectively avoiding the problem that waste gas leaks from a peeping hole, avoiding the situation that gas on the inner side and the outer side of the lifting valve cannot permeate mutually, and achieving the purpose of preventing organic waste gas from leaking; the working efficiency of the heat storage combustion furnace is improved, meanwhile, the safety of the whole system is guaranteed, and the purpose of zero leakage is achieved.

Description

Technical Field

[0001] The utility model relates to a combustion furnace system, in particular to a zero-leakage heat storage type combustion furnace system, belonging to the technical field of organic waste gas treatment. Background Art

[0002] The treatment of low-boiling-point volatile organic compounds (VOCs) in the form of vapor is a major challenge facing the country, especially the treatment of organic waste gas generated in modern industry. Regenerative thermal combustion (RTO) technology is a traditional and efficient means of treating high-concentration organic waste gas, with an organic waste gas treatment efficiency of up to 99%. The key to regenerative thermal combustion is to ensure the sealing of the regenerative combustion furnace. The superior performance of the reversing valve and the real-time concentration, temperature, and pressure control and monitoring process can effectively guarantee the working quality of the entire RTO furnace operation.

[0003] In existing technologies, regenerative combustion systems often experience excessive pressure during operation. When furnace pressure is too high, the RTO furnace can easily explode, leading to dangerous accidents such as explosions. Preventing this problem is a pressing technical challenge. Furthermore, the reversing valves (inlet and exhaust valves) used in the combustion furnace are often made of highly wear-resistant materials, with soft seals or steel plates directly contacting the valve body. RTO furnaces operate at temperatures exceeding 760°C, making conventional soft seals difficult to use for extended periods and requiring frequent replacement. Furthermore, hard seals, where the steel plate directly contacts the valve body, require extremely high machining precision. The reversing valve switches hundreds of thousands of times annually, causing metal fatigue and micro-deformation in the valve plate. This can also reduce the RTO furnace's sealing performance, leading to organic waste gas leakage and reduced treatment efficiency. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a zero-leakage heat storage combustion furnace system with reasonable structural design, which can effectively avoid excessive pressure, is safe and reliable to use and has good sealing performance, thereby effectively avoiding the problem of organic waste gas leakage.

[0005] In order to solve the above technical problems, the zero-leakage regenerative combustion furnace system of the present invention includes a regenerative combustion furnace with multiple regenerative chambers, a chimney for discharging exhaust gas, an air intake system for each of the regenerative chambers, and an exhaust system for exhausting air from each of the regenerative chambers. The air intake system includes an air intake pipe, a flame arrester arranged on the air intake pipe for allowing external fresh air to pass through in sequence, an adsorption fan, a plurality of branch pipes connected to the adsorption fan, and an air intake valve located at the inlet end of each of the branch pipes; the exhaust system includes an air outlet pipe connected to each regenerative chamber and leading to the chimney, an exhaust valve located at the outlet of each regenerative chamber arranged on the air outlet pipe, and an outlet thermocouple located at the inlet end of the chimney arranged on the air outlet pipe. The regenerative combustion furnace is also provided with an air-insulated fire-penetrating device for introducing a compressed air source, a plurality of temperature transmitters for monitoring temperature changes in the regenerative combustion furnace, and a pressure transmitter for monitoring pressure changes in the regenerative combustion furnace.

[0006] The air inlet valve and the exhaust valve are both airtight switching valves.

[0007] The airtight switching valve includes a cylinder installed through a cylinder base, a valve stem connected to the cylinder through a floating joint, a valve plate connected to the valve stem, a valve plate base for installing the valve plate, and a No. 1 gas source connector provided on the valve plate base for connecting to the gas source.

[0008] The gas-insulated fire-penetrating device comprises a fire-penetrating steel pipe, a second gas source joint arranged on the fire-penetrating steel pipe, and high-temperature glass arranged at one end of the fire-penetrating steel pipe.

[0009] The flame arrester is equipped with an anti-leakage device.

[0010] An exhaust pipe is connected between the heat storage combustion furnace and the chimney, and an emergency exhaust valve is provided on the exhaust pipe.

[0011] The cleaning pipeline communicated with each heat storage chamber is also connected between the flame arrester and the adsorption fan, and the cleaning switch valve corresponding to each heat storage chamber is provided on the cleaning pipeline.

[0012] A differential pressure transmitter is provided between the air outlet pipeline and the outlet of the adsorption fan.

[0013] The air intake pipeline is provided with an air intake regulating valve located in front of the flame arrester.

[0014] The temperature transmitter is a multi-thermal resistor temperature transmitter.

[0015] After adopting the above structure, a monitoring system is formed by the gas-insulated fire-peek device, multiple multi-thermal resistor temperature transmitters and pressure transmitters arranged on the heat storage combustion furnace, thereby avoiding the problem of dangerous accidents such as explosion of the RTO furnace when the furnace pressure is too high. At the same time, the multi-thermal resistor temperature transmitter can accurately monitor the temperature changes in the RTO furnace. On the one hand, it can effectively avoid instrument failure caused by damage to a single thermal resistor. On the other hand, when exhaust gas leakage occurs, the furnace chamber where the leakage occurs can be detected; on the other hand, when the RTO furnace is running, the compressed gas source is connected to the No. 2 gas source connector at the gas-insulated fire-peek device. The gas source isolates most of the high-temperature gases in the furnace body, avoiding the high-temperature glass from being in a high-temperature state for a long time, extending its service life, and the gas-insulated fire-peek device effectively avoids the temperature change caused by temperature. The high-temperature glass caused by excessive temperature breaks, which leads to the leakage of exhaust gas from the peephole. On the one hand, the airtight switching valve has a simple structural design and a reasonable principle. It is connected to the compressed air source through the No. 1 air source connector of the seamless steel pipe. When the RTO lifting valve is closed, there is a micro gap between the valve plate and the valve plate base. The air source valve opens, and the gas flows into the square tube and rushes to both sides through the air gap at the end face of the square tube, eliminating the gas inside and outside the lifting valve from penetrating each other, thereby preventing the leakage of organic waste gas. On the other hand, sealing monitoring measures are used in the three processes of air intake, treatment and discharge, which strictly ensure that the organic waste gas does not leak out during the treatment process. While improving the working efficiency of the heat storage combustion furnace, the safety of the entire system is guaranteed to achieve the goal of zero leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the system principle of the zero-leakage regenerative combustion furnace system of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the air-sealed switching valve in the present invention;

[0018] Figure 3 This is a schematic structural diagram of the utility model of the gas insulation type fire peeping device. DETAILED DESCRIPTION

[0019] The zero-leakage regenerative combustion furnace system of the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0020] As shown in the figure, the zero-leakage regenerative combustion furnace system of the present invention includes a regenerative combustion furnace 1 with three regenerative chambers (regenerative chamber No. 1, regenerative chamber No. 2, and regenerative chamber No. 3 from left to right), a chimney 2 for discharging exhaust gas, an air intake system for intake of air into each regenerative chamber, and an exhaust system for exhaust of air from each regenerative chamber. The air intake system includes an air intake pipe 5, a flame arrester 3 provided on the air intake pipe 5 for allowing external fresh air and organic waste gas to pass through in sequence, an adsorption fan 4, and a fan connected to the adsorption fan 4. The three branch pipes on the outlet and the air intake valves 6 are respectively provided on the three branch pipes, thereby connecting the three branch pipes to the inlet ends of the heat storage chambers respectively. The three air intake valves are respectively provided at the inlet ends of the heat storage chambers. At the same time, an air intake regulating valve 28 located in front of the flame arrester can be provided on the air intake pipe 5. A purge pipe 25 communicating with each heat storage chamber is also connected between the flame arrester 3 and the adsorption fan 4. The purge pipe 25 is provided with a purge switch valve 26 corresponding to each heat storage chamber. The exhaust system includes an outlet pipe 7 connected to the three regenerative chambers and leading to the chimney 2, an exhaust valve 8 provided on the outlet pipe 7 and located at the outlet of the three regenerative chambers, and an outlet temperature transmitter (thermocouple) 9 provided on the outlet pipe and located at the inlet end of the chimney. A pressure differential transmitter 27 is provided between the outlet pipe 7 and the outlet of the adsorption fan 2. The exhaust system also includes an exhaust pipe 23 connected between the regenerative combustion furnace 1 and the chimney 2 and an emergency exhaust valve 24 provided on the exhaust pipe 23. The combustion furnace 1 is also provided with a gas-insulated fire-penetrating device 10 for introducing a compressed gas source, a plurality of temperature transmitters 11 for monitoring temperature changes in the thermal storage combustion furnace, and a pressure transmitter 12 for monitoring pressure changes in the thermal storage combustion furnace. An explosion-proof plate is provided on the top of the thermal storage combustion furnace 1, wherein two temperature transmitters are installed on both sides of the furnace chamber inside and outside each thermal storage chamber, and the pressure transmitter is installed on the top surface of the thermal storage combustion furnace 1. An oxidation temperature sensor 29 is also installed on the top surface of the thermal storage combustion furnace 1.

[0021] Furthermore, the intake valve 6 and the exhaust valve 8 are both air-tight switching valves, which include a cylinder 14 installed through a cylinder base 13, a valve stem 16 connected to the telescopic end of the cylinder 14 through a floating joint 15, a valve plate 17 connected to the valve stem, a valve plate base 18 for installing the valve plate, and a No. 1 air source connector 19 for accessing the air source provided on the valve plate base, wherein the valve plate base is bent from a square tube, an air gap is opened at the center of one end face of the square tube, an air guide hole is opened on the square tube, and a seamless steel pipe is provided as the No. 1 air source connector, and the valve stem 16 is supported by a valve body bracket 30, thereby being able to access the compressed air source through the seamless steel pipe.

[0022] During installation, the end face of the valve body bracket 30 is punched and connected to the flange bolt of the RTO furnace body. The valve body bracket 30 is connected to the furnace body on one hand and supports the valve stem 16 on the other hand. A sealing gasket and a graphite copper ring are installed between the valve body bracket 30 and the valve stem. The sealing gasket ensures the sealing of the valve stem. The graphite copper ring can effectively conduct temperature while ensuring the sealing. One end of the valve stem 16 is connected to the valve plate 17 and the other end is connected to the floating joint 15. The valve plate 17 fits with the square tube 25. A 3mm air gap is opened in the center of the square tube end face. The floating joint 15 is connected to the cylinder 14. There is a circle on the outside of the floating joint 15 The hollow design of the cylinder base 13 plays a role in heat dissipation, effectively controlling the cylinder 14 to maintain a normal temperature, and protecting the cylinder and the sealing gasket; when the airtight switching valve is closed, the cylinder 14 drives the valve stem 16 to tighten the valve plate 17, so that it fits the square tube, and the compressed gas source flows into the interior of the square tube from the No. 1 gas source connector 19, and the gas is ejected outward from the air gap of the square tube and dispersed to both sides. The gas in the furnace is blocked and cannot overflow from the gap, thereby preventing the gas inside and outside the airtight switching valve from penetrating each other, preventing the leakage of organic waste gas, and achieving the purpose of zero leakage.

[0023] Furthermore, the gas-insulated fire-penetrating device 10 includes a fire-penetrating steel pipe 20 welded to the heat storage combustion furnace, a No. 2 gas source connector 21 arranged on the fire-penetrating steel pipe 20, and a high-temperature glass 22 arranged at one end of the fire-penetrating steel pipe 20. The No. 2 gas source connector is also connected to the compressed gas source. In addition, a leakage prevention device is installed on the flame arrester 3.

[0024] Here's how it works:

[0025] The organic waste gas is controlled by PLC from the air intake pipe 5 according to the different stages of the RTO furnace. The air intake valve 6, exhaust valve 8 and purge switch valve 26 of each furnace chamber are switched on and off. When the air intake valve of the No. 1 heat storage chamber is opened, the exhaust valve of the No. 1 heat storage chamber and the purge switch valve of the No. 1 heat storage chamber are in a closed state, the exhaust valve of the No. 2 heat storage chamber is in an open state, the air intake valve of the No. 2 heat storage chamber and the purge switch valve of the No. 2 heat storage chamber are in a closed state, the purge switch valve of the No. 3 heat storage chamber is in an open state, the air intake valve of the No. 2 heat storage chamber and the exhaust valve of the No. 2 heat storage chamber are in a closed state, the RTO furnace chamber cycles through the three states of intake-exhaust-purge, and the switching cycle is 100-180s. During this period, all temperature transmitters and pressure transmitters are in In the monitoring state, the burner of the regenerative combustion furnace automatically adjusts the flame size according to the temperature and pressure through PLC control. When the pressure in the furnace of the regenerative combustion furnace exceeds the limit value, the explosion vent can effectively prevent safety accidents from occurring; the exhaust system mainly includes an emergency discharge valve 24, an outlet temperature transmitter 9 and a pressure differential transmitter 27. When the furnace pressure is too high, the emergency discharge valve 24 is opened, which can effectively prevent dangerous accidents such as explosions in the RTO furnace and indirectly control the leakage of organic waste gas caused by safety accidents. The outlet temperature transmitter 9 can monitor whether the RTO furnace is operating normally. Combined with the various monitors on the RTO furnace, the sealing of the entire RTO system can be more accurately confirmed, and finally the treated gas is discharged into the atmosphere through the chimney 2.

[0026] When the entire system is running, the compressed gas source is blown into the RTO furnace body through the No. 2 gas source connector 21 on the fire-penetrating steel pipe 20. When the RTO furnace is running, it can effectively isolate the high-temperature mixed gas in the furnace body, reduce the temperature at the high-temperature resistant glass, and improve the service life. At the same time, the internal state of the furnace body can be observed through the high-temperature glass 22.

Claims

1. A zero-leakage regenerative combustion furnace system, comprising a regenerative combustion furnace (1) having a plurality of regenerative chambers, a chimney (2) for discharging exhaust gas, an air intake system for intake of air into each of the regenerative chambers, and an exhaust system for exhaust of air from each of the regenerative chambers, characterized in that: The air intake system comprises an air intake pipeline (5), a flame arrester (3) arranged on the air intake pipeline (5) for allowing external fresh air to pass through in sequence, an adsorption fan (4), a plurality of branch pipelines connected to the adsorption fan (4), and an air intake valve (6) arranged on each of the branch pipelines and located at the inlet end of each of the heat storage chambers; the exhaust system comprises an air outlet pipeline (7) connected to each of the heat storage chambers and leading to a chimney (2), an exhaust valve (8) arranged on the air outlet pipeline (7) and located at the outlet of each of the heat storage chambers, and an outlet thermocouple (9) arranged on the air outlet pipeline and located at the inlet end of the chimney; the heat storage combustion furnace (1) is also provided with an air insulation type fire peek device (10) for introducing a compressed air source, a plurality of temperature transmitters (11) for monitoring temperature changes in the heat storage combustion furnace, and a pressure transmitter (12) for monitoring pressure changes in the heat storage combustion furnace.

2. The zero-leakage regenerative combustion furnace system according to claim 1, characterized in that: The air intake valve (6) and the air exhaust valve (8) are both airtight switching valves.

3. The zero-leakage regenerative combustion furnace system according to claim 2, characterized in that: The airtight switching valve comprises a cylinder (14) mounted via a cylinder base (13), a valve stem (16) connected to the cylinder (14) via a floating joint (15), a valve plate (17) connected to the valve stem, a valve plate base (18) for mounting the valve plate, and a No. 1 gas source connector (19) provided on the valve plate base for connecting to a gas source.

4. The zero-leakage regenerative combustion furnace system according to claim 1, 2 or 3, characterized in that: The gas-insulated fire-penetrating device (10) comprises a fire-penetrating steel pipe (20), a second gas source joint (21) arranged on the fire-penetrating steel pipe (20), and a high-temperature glass (22) arranged at one end of the fire-penetrating steel pipe (20).

5. The zero-leakage regenerative combustion furnace system according to claim 4, characterized in that: The flame arrester (3) is equipped with a leakage prevention device.

6. The zero-leakage regenerative combustion furnace system according to claim 1, 2, 3 or 5, characterized in that: An exhaust pipe (23) is connected between the regenerative combustion furnace (1) and the chimney (2), and an emergency exhaust valve (24) is provided on the exhaust pipe (23).

7. The zero-leakage regenerative combustion furnace system according to claim 6, characterized in that: A cleaning pipeline (25) communicating with each heat storage chamber is also connected between the flame arrester (3) and the adsorption fan (4), and a cleaning switch valve (26) corresponding to each heat storage chamber is provided on the cleaning pipeline (25).

8. The zero-leakage regenerative combustion furnace system according to claim 7, characterized in that: A differential pressure transmitter (27) is provided between the air outlet pipeline (7) and the outlet of the adsorption fan (4).

9. The zero-leakage regenerative combustion furnace system according to claim 8, characterized in that: The air intake pipeline (5) is provided with an air intake regulating valve (28) located in front of the flame arrester.

10. The zero-leakage regenerative combustion furnace system according to claim 9, characterized in that: The temperature transmitter (11) is a multi-thermal resistor temperature transmitter.

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