RTO system of negative pressure heat accumulation incineration

Abstract

The utility model relates to waste gas treatment equipment technical field discloses a kind of RTO systems of negative pressure heat accumulation incineration, including buffer tank, buffer filter box and three-room heat accumulation incinerator, further include main fan, fourth gas pipe and chimney, the air outlet of buffer tank is connected with the air inlet of buffer filter box by first gas pipe, the air outlet of buffer filter box is connected with the air inlet of three-room heat accumulation incinerator by second gas pipe, the exhaust port of three-room heat accumulation incinerator is connected with chimney by third gas pipe, main fan is equipped on third gas pipe, one end of fourth gas pipe is connected with first gas pipe, another end of fourth gas pipe is connected with chimney. The utility model can not only treat organic waste gas under negative pressure, but also switch processing mode when production fluctuation occurs, effectively improve the treatment effect of organic waste gas, improve the security of waste gas treatment.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment equipment, and in particular to a negative pressure regenerative thermal oxidizer (RTO) system. Background Technology

[0002] In chemical production, especially in coal chemical and fine chemical processes, VOCs (volatile organic compounds) are common pollutants. They are important precursors to PM2.5 and ozone, leading to reduced visibility, impacting air quality and climate, polluting the environment, and posing a threat to worker health. Therefore, VOCs treatment technologies are crucial. Currently, adsorption, absorption, catalytic combustion, and biological treatment technologies are mainly used to treat collected VOCs waste gas to ensure it meets emission standards.

[0003] In general chemical production processes, VOCs are usually treated using a spray tower and incinerator. The water in the spray tower acts as a physical absorber, capturing some components. Most of the unabsorbed gas is sent to an RTO combustion system by a fan for incineration. The RTO combustion system is a high-efficiency device for treating organic waste gas and VOCs. The RTO decomposes the waste gas through high-temperature oxidation, converting it into harmless substances such as carbon dioxide and water vapor, while simultaneously achieving energy recycling.

[0004] The existing technology has at least the following problems: During the air supply and combustion process, the pipeline and furnace are always under positive pressure, and organic waste gas continuously enters the incinerator of the RTO combustion system for combustion. When production fluctuates, high-concentration waste gas will enter the RTO device. Positive pressure operation will cause high-concentration waste gas to be continuously sent into the furnace, which will lead to insufficient gas treatment in the furnace and possible overflow during the treatment process. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by developing a negative pressure regenerative thermal oxidizer (RTO) system. This invention can treat organic waste gas under negative pressure and can switch treatment modes when production fluctuations occur, effectively improving the treatment effect of organic waste gas and enhancing the safety of waste gas treatment.

[0006] The technical solution of this utility model to solve the technical problem is as follows: a negative pressure regenerative thermal oxidizer (RTO) system, including a buffer tank, a buffer filter box, and a three-chamber regenerative thermal oxidizer, and also including a main fan, a fourth gas pipe, and a chimney. The outlet of the buffer tank is connected to the inlet of the buffer filter box through a first gas pipe, the outlet of the buffer filter box is connected to the inlet of the three-chamber regenerative thermal oxidizer through a second gas pipe, the exhaust port of the three-chamber regenerative thermal oxidizer is connected to the chimney through a third gas pipe, the main fan is installed on the third gas pipe, one end of the fourth gas pipe is connected to the first gas pipe, and the other end of the fourth gas pipe is connected to the chimney.

[0007] As an optimization, a first shut-off valve is installed on the first gas pipe between the fourth gas pipe and the buffer filter box. Both the buffer tank and the buffer filter box are equipped with fresh air inlets, each with a fresh air valve. By installing the first shut-off valve, the first gas pipe can be shut off in emergencies such as production fluctuations or insufficient gas treatment, cutting off high-concentration waste gas from the incineration system. The fresh air valve on the buffer tank can dilute the high-concentration waste gas, and the fresh air valve on the buffer filter box allows for ventilation to the atmosphere in emergencies, providing fresh air for incineration.

[0008] As an optimization, the fourth gas pipe is equipped with a second shut-off valve and an activated carbon box. The second shut-off valve is located between the first gas pipe and the activated carbon box. By setting up the second shut-off valve and the activated carbon box, in emergency situations such as production fluctuations or insufficient gas treatment, high-concentration waste gas can be cut into the fourth gas pipe, and the activated carbon in the activated carbon box can adsorb the organic waste gas.

[0009] As an optimization, a flame arrester is installed on the second gas pipe. By installing a flame arrester, the spread of flames from organic waste gas can be prevented, combustion diffusion can be prevented, and the risk of backfire and flash explosion can be reduced during emergency shutdown.

[0010] As an optimization, a combustion air fan is also included. A burner is located at the top of the three-chamber regenerative thermal incinerator, and the burner is connected to the outlet of the combustion air fan via a fifth gas pipe. By installing the combustion air fan and burner, the organic waste gas in the high-temperature oxidation chamber can be ignited and burned, converting it into carbon dioxide and water.

[0011] As an optimization, a back-blowing fan is also included, which is connected to the back-blowing port at the bottom of the three-chamber regenerative thermal oxidizer via a sixth gas pipe. By installing the back-blowing fan and the sixth gas pipe, the three-chamber regenerative thermal oxidizer can be back-blown to remove residual exhaust gas.

[0012] Compared with existing technologies, this invention has the following advantages: By setting up a buffer tank, pressure fluctuations within the pipeline system can be buffered, making the system operate more smoothly; by setting up a buffer filter box, particulate matter in the gas can be filtered out, and in emergencies, it can be connected to the atmosphere to provide fresh air for the three-chamber regenerative thermal oxidizer; by setting up a three-chamber regenerative thermal oxidizer, organic waste gas can be heated and burned, converting it into carbon dioxide and water; by setting up a main fan, the pipeline and furnace body can be kept under negative pressure, reducing the accumulation of explosive gases at the rear of the system, and the negative pressure can more effectively extract residual gas in the pipeline and the gas after combustion in the furnace, and discharge it into the chimney; by setting up a fourth gas pipe, the pipeline can be switched in emergencies such as production fluctuations or insufficient gas treatment, improving equipment safety; by setting up a chimney, the gas after combustion in the furnace can be discharged. This invention can treat organic waste gas under negative pressure and can switch treatment methods when production fluctuations occur, effectively improving the treatment effect of organic waste gas and enhancing the safety of waste gas treatment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a system according to an embodiment of the present invention.

[0014] In the diagram: 1. Buffer tank; 2. Buffer filter box; 3. Three-chamber regenerative thermal oxidizer; 4. Main fan; 5. First gas pipe; 6. Chimney; 7. LEL measuring point; 8. Second gas pipe; 9. Third gas pipe; 10. Fourth gas pipe; 11. First shut-off valve; 12. Fresh air valve; 13. Second shut-off valve; 14. Activated carbon box; 15. Flame arrester; 16. Combustion air fan; 17. Burner; 18. Fifth gas pipe; 19. Backflow fan; 20. Sixth gas pipe. Detailed Implementation

[0015] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0016] Example 1

[0017] Figure 1 As one embodiment of this utility model, such as Figure 1As shown, a negative pressure regenerative thermal oxidizer (RTO) system includes a buffer tank 1, a buffer filter box 2, and a three-chamber regenerative thermal oxidizer 3. It also includes a main blower 4, a fourth gas pipe 10, and a chimney 6. The buffer tank 1 has an air inlet pipe with an LEL measuring point 7. The air outlet of the buffer tank 1 is connected to the air inlet of the buffer filter box 2 through a first gas pipe 5. The air outlet of the buffer filter box 2 is connected to the air inlet of the three-chamber regenerative thermal oxidizer 3 through a second gas pipe 8. The exhaust port of the three-chamber regenerative thermal oxidizer 3 is connected to the chimney 6 through a third gas pipe 9. The main blower 4 is installed on the third gas pipe 9. One end of the fourth gas pipe 10 is connected to the first gas pipe 5, and the other end of the fourth gas pipe 10 is connected to the chimney 6.

[0018] By setting up buffer tank 1, pressure fluctuations within the pipeline system can be buffered, making the system operate more smoothly; by setting up buffer filter box 2, particulate matter in the gas can be filtered out, and in emergencies, it can be connected to the atmosphere to provide fresh air for the three-chamber regenerative thermal oxidizer 3; by setting up three-chamber regenerative thermal oxidizer 3, organic waste gas can be heated and burned, converting it into carbon dioxide and water; by setting up main fan 4, the pipeline and furnace body can be kept under negative pressure, reducing the accumulation of explosive gas at the rear of the system, and the negative pressure can more effectively extract residual gas in the pipeline and the gas after combustion in the furnace, and discharge it into chimney 6; by setting up fourth gas pipe 10, pipeline can be switched in emergencies such as production fluctuations or insufficient gas treatment, improving equipment safety; by setting up chimney 6, the gas after combustion in the furnace can be discharged.

[0019] A first shut-off valve 11 is installed on the first gas pipe 5 between the connection point of the fourth gas pipe 10 and the first gas pipe 5 and the buffer filter box 2. Both the buffer tank 1 and the buffer filter box 2 are equipped with fresh air inlets, and each fresh air inlet is equipped with a fresh air valve 12. By setting the first shut-off valve 11, the first gas pipe 5 can be shut off in emergency situations such as production fluctuations or insufficient gas treatment, cutting off high-concentration waste gas from the incineration system. By setting the fresh air valve 12 on the buffer tank 1, high-concentration waste gas can be diluted. By setting the fresh air valve 12 on the buffer filter box 2, it can be connected to the atmosphere in emergency situations to provide fresh air for incineration.

[0020] The fourth gas pipe 10 is equipped with a second shut-off valve 13 and an activated carbon box 14. The second shut-off valve 13 is located between the first gas pipe 5 and the activated carbon box 14. By setting the second shut-off valve 13 and the activated carbon box 14, in emergency situations such as production fluctuations or insufficient gas treatment, high-concentration waste gas can be cut into the fourth gas pipe 10, and the activated carbon in the activated carbon box 14 can adsorb the organic waste gas.

[0021] A flame arrester 15 is installed on the second gas pipe 8. By installing the flame arrester 15, the spread of flames from organic waste gas can be prevented, combustion can be prevented from spreading, and the risk of backfire and flash explosion can be reduced during emergency shut-off.

[0022] It also includes a combustion air fan 16. The top of the three-chamber regenerative thermal oxidizer 3 is equipped with a burner 17, temperature measuring points, and pressure measuring points. The burner 17 is connected to the air outlet of the combustion air fan 16 through a fifth gas pipe 18. By setting up the combustion air fan 16 and the burner 17, the organic waste gas in the high-temperature oxidation chamber can be ignited and burned, converting it into carbon dioxide and water. By setting up temperature and pressure measuring points, the temperature and pressure inside the furnace can be detected. It can be interlocked with the fan to ensure stable system pressure and can also monitor the furnace status in real time, reducing environmental pollution and safety hazards.

[0023] It also includes a back-blowing fan 19, which is connected to the back-blowing port at the bottom of the three-chamber regenerative thermal incinerator 3 via a sixth gas pipe 20. By setting up the back-blowing fan 19 and the sixth gas pipe 20, the three-chamber regenerative thermal incinerator 3 can be back-blown to exhaust the residual waste gas in the thermal regenerator and bring the heat back into the furnace.

[0024] In operation, organic waste gas enters buffer tank 1 through the inlet pipe. The LEL analyzer detects the concentration of organic waste gas at LEL measuring point 7. After being buffered by buffer tank 1, the organic waste gas enters buffer filter box 2 through the first gas pipe 5 and the first shut-off valve 11 for filtration. After filtration, it enters the three-chamber regenerative thermal oxidizer 3 through the second gas pipe 8. The three-chamber regenerative thermal oxidizer 3 includes a high-temperature oxidation chamber, a first ceramic regenerator, a second ceramic regenerator, and a third ceramic regenerator. All three ceramic regenerators are connected to the high-temperature oxidation chamber. Each heat exchanger is equipped with a switching valve assembly, which includes an inlet valve, an exhaust valve, and a backflush valve. The inlet valve opening is the inlet of the three-chamber regenerative thermal oxidizer 3, the exhaust valve opening is the exhaust port of the three-chamber regenerative thermal oxidizer 3, and the backflush valve opening is the backflush port of the three-chamber regenerative thermal oxidizer 3. The three sets of inlet valves are connected to the second gas pipe 8 through three sets of inlet branch pipes, the three sets of exhaust valves are connected to the third gas pipe 9 through three sets of exhaust branch pipes, and the three sets of backflush valves are connected to the sixth gas pipe 20 through three sets of backflush branch pipes. During the first combustion, the organic waste gas first enters the first ceramic heat exchanger through the inlet valve on the first ceramic heat exchanger. The heat exchanger releases heat to heat the organic waste gas, which is then heated to approximately 750°C before entering the high-temperature oxidation chamber. The gas is ignited by burner 17. The resulting high-temperature clean gas enters the second ceramic heat exchanger, which absorbs heat to cool the gas. After cooling, the gas is drawn in by the main fan 4 and passes through the exhaust valve of the second ceramic heat exchanger into the third gas pipe 9, which then discharges into the chimney 6. The back-blowing fan 19 draws outside air through the sixth gas pipe 20 and the back-blowing valve on the third ceramic heat exchanger, thus back-blowing the waste gas between the second and third ceramic heat exchangers. The high-temperature oxidation chamber carries heat back to the high-temperature oxidation chamber. After the first combustion, the switching valve groups switch to initiate the second combustion. The organic waste gas enters the high-temperature oxidation chamber from the preheated second ceramic regenerator for combustion. After combustion, it is cooled by the third ceramic regenerator and discharged. The back blower 19 back-blown the first ceramic regenerator. After the second combustion, the switching valve groups switch again to initiate the third combustion. The preheated third ceramic regenerator enters the high-temperature oxidation chamber for combustion. After combustion, it is cooled by the first ceramic regenerator and discharged. The back blower 19 back-blown the second ceramic regenerator, completing one round of combustion. The above combustion process is repeated.When the LEL analyzer at LEL measuring point 7 detects fluctuations in the concentration of organic waste gas, the first shut-off valve 11 closes, the fresh air valve 12 on the buffer filter box 2 opens to provide fresh air for the combustion of the remaining organic waste gas in the furnace, and the second shut-off valve 13 opens to switch the organic waste gas to the fourth gas pipe 10. The organic waste gas is adsorbed by the activated carbon in the activated carbon box 14 and finally enters the chimney 6 for discharge. It should be noted that the high-temperature oxidation chamber is connected to the chimney 6 through the seventh gas pipe, which is equipped with a third shut-off valve. In case of emergency, the organic waste gas in the high-temperature oxidation chamber can be discharged directly into the chimney 6 through the seventh gas pipe. When the LEL analyzer at LEL measuring point 7 detects that the concentration of organic waste gas has returned to stability, indicating that production has returned to stability, the organic waste gas is then switched back to the three-chamber regenerative thermal oxidizer 3 for combustion. This invention can treat organic waste gas under negative pressure and can switch treatment modes when production fluctuations occur, effectively improving the treatment effect and safety of waste gas treatment.

[0025] The descriptions of the orientation or relative positional relationships of the structure in this utility model, such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inner", and "outer", are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A negative pressure regenerative thermal oxidizer (RTO) system, comprising a buffer tank (1), a buffer filter box (2), and a three-chamber regenerative thermal oxidizer (3), characterized in that: It also includes a main fan (4), a fourth air pipe (10) and a chimney (6). The outlet of the buffer tank (1) is connected to the inlet of the buffer filter box (2) through the first air pipe (5). The outlet of the buffer filter box (2) is connected to the inlet of the three-chamber regenerative incinerator (3) through the second air pipe (8). The exhaust port of the three-chamber regenerative incinerator (3) is connected to the chimney (6) through the third air pipe (9). The main fan (4) is installed on the third air pipe (9). One end of the fourth air pipe (10) is connected to the first air pipe (5), and the other end of the fourth air pipe (10) is connected to the chimney (6).

2. The RTO system with negative pressure regenerative thermal oxidizer according to claim 1, characterized in that: A first shut-off valve (11) is provided on the first air pipe (5) between the fourth air pipe (10) and the buffer filter box (2). Both the buffer tank (1) and the buffer filter box (2) are provided with fresh air inlets, and each fresh air inlet is provided with a fresh air valve (12).

3. The RTO system with negative pressure regenerative thermal oxidizer according to claim 2, characterized in that: The fourth air pipe (10) is equipped with a second shut-off valve (13) and an activated carbon box (14). The second shut-off valve (13) is located between the first air pipe (5) and the activated carbon box (14).

4. The RTO system with negative pressure regenerative thermal oxidizer according to claim 1, characterized in that: A flame arrester (15) is provided on the second gas pipe (8).

5. The RTO system with negative pressure regenerative thermal oxidizer according to claim 1, characterized in that: It also includes a combustion air blower (16), and a burner (17) is provided on the top of the three-chamber regenerative incinerator (3). The burner (17) is connected to the air outlet of the combustion air blower (16) through a fifth gas pipe (18).

6. A negative pressure regenerative thermal oxidizer (RTO) system according to any one of claims 1 to 5, characterized in that: It also includes a back-blowing fan (19), which is connected to the back-blowing port at the bottom of the three-chamber regenerative incinerator (3) via a sixth gas pipe (20).

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