RTO system suitable for high-concentration waste gas treatment

Abstract

The utility model provides an RTO (Regenerative Thermal Oxidation) system suitable for high-concentration waste gas treatment, which comprises a regenerative oxidation furnace, a buffer tank and a detection unit, the gas outlet end of the buffer tank is connected with a combustion chamber in the heat accumulating type oxidation furnace after sequentially passing through a double-stop valve, a nitrogen purging device, a one-way valve and a flame arrester; the detection unit is arranged on the high-concentration waste gas inlet pipeline, and the detection unit and the double stop valves are in interlocking control. According to the RTO system, the oxygen content and the waste gas concentration in high-concentration waste gas can be monitored in real time through the detection unit, it is ensured that the oxygen content in the waste gas is lower than 2%, and the VOC concentration is lower than 25% or 20% of the minimum explosion lower limit, so that safety accidents such as explosion are effectively prevented, the whole RTO system can automatically adjust the operation mode according to the oxygen content, and the operation efficiency is improved. Manual intervention is reduced, the automation degree and operation stability of the system are improved, energy conservation, environmental protection and efficient operation are achieved, and the industrial utilization value is high.

Description

Technical Field

[0001] This utility model relates to the technical field of waste gas treatment devices, and in particular to an RTO system suitable for treating high-concentration waste gas. Background Technology

[0002] Regenerative thermal oxidizers (RTOs) are used to treat waste gases based on their chemical composition and volume. High-concentration waste gases are burned in the combustion chamber, while low-concentration waste gases are preheated in the regenerator chamber before being oxidized at high temperatures. RTO systems can completely treat waste gases generated during production, converting organic matter into harmless substances such as CO2 and H2O, ultimately meeting emission standards. They are environmentally friendly, have high thermal efficiency (greater than 95%), high waste gas treatment efficiency (greater than 99%), and offer flexible system operation.

[0003] However, current RTO systems lack safety warnings for high-concentration exhaust gases. They often directly introduce high-concentration exhaust gases from uncertain sources into the combustion chamber. When aromatic compounds account for more than 25% of the total VOCs or the oxygen content is greater than 2%, safety accidents such as explosions are likely to occur. Furthermore, the performance of many RTO systems has not met expectations, casting a shadow over the use of RTO by some companies. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an RTO system suitable for the treatment of high-concentration waste gas, so as to solve the problem that the prior art lacks safety control before high-concentration waste gas enters the RTO system for combustion, which is prone to causing safety accidents.

[0005] To achieve the above and other related objectives, this utility model provides an RTO system suitable for treating high-concentration waste gas, comprising:

[0006] A regenerative oxidizer, wherein a combustion chamber is provided inside the regenerative oxidizer, and several regenerative chambers are arranged in sequence below the combustion chamber, and an ignition device is provided at the top of the combustion chamber;

[0007] The buffer tank is connected to the inlet end of the high-concentration waste gas inlet pipeline via a fan. The outlet end of the buffer tank is connected to the combustion chamber in the regenerative oxidizer via a double shut-off valve, a nitrogen purging device, a one-way valve and a flame arrester in sequence.

[0008] The detection unit is installed on the high-concentration exhaust gas inlet pipe, and the detection unit is interlocked with the double shut-off valve.

[0009] In one embodiment of the present invention, the outlet end of the buffer tank is further provided with a bypass pipeline, and the bypass pipeline is provided with a valve and a flame arrester.

[0010] In one embodiment of the present invention, the bottom of the buffer tank is further provided with a condensate outlet.

[0011] In one embodiment of the present invention, the detection unit includes an oxygen concentration meter for monitoring the oxygen content in high-concentration exhaust gas, and the oxygen concentration meter and the dual shut-off valve are interlocked for control.

[0012] In one embodiment of this utility model, when the oxygen content is less than 2%, the high-concentration waste gas is pressurized by the fan and enters the regenerative oxidizer through the high-speed nozzle; when the oxygen content reaches 2%, the double shut-off valve cuts off the intake of the high-concentration waste gas, so that the high-concentration waste gas is treated by high-speed discharge through the bypass pipeline, while the nitrogen purging device purges and replaces the tail gas.

[0013] In one embodiment of the present invention, the detection unit further includes an LEL gas detector, which is used to monitor the concentration of exhaust gas in high-concentration exhaust gas.

[0014] In one embodiment of the present invention, the heat storage chamber includes heat storage chamber A, heat storage chamber B and heat storage chamber C in sequence, and the heat storage chamber is filled with ceramic heat storage body.

[0015] In one embodiment of this utility model, the low-concentration waste gas inlet pipe is connected to the heat storage chamber A.

[0016] As described above, the RTO system of this invention, suitable for treating high-concentration waste gas, has the following beneficial effects:

[0017] 1. This invention, by incorporating a detection unit (including an oxygen concentration meter and an LEL gas detector), can monitor the oxygen content and concentration in high-concentration exhaust gas in real time, ensuring that the oxygen content in the exhaust gas is below 2% and the VOC concentration is below 25% or 20% of the minimum explosive limit (LEL), thereby effectively preventing safety accidents such as explosions. Furthermore, the interlocking control of the oxygen concentration meter and the dual shut-off valves allows the RTO system of this invention to automatically adjust its operating mode according to the oxygen content, reducing manual intervention and improving the system's automation and operational stability. When the RTO system detects that the oxygen content reaches or exceeds 2%, the dual shut-off valves will cut off the intake of high-concentration exhaust gas, and a nitrogen purging device will purge and replace the pipeline to prevent the impact of high-temperature heat radiation on the upstream pipeline, ensuring the safe operation of the system.

[0018] 2. By setting a one-way valve and a flame arrester, this utility model can effectively prevent flame backfire and ensure the safety of the front-end pipelines and equipment.

[0019] 3. This utility model has a bypass pipeline at the outlet of the buffer tank. When the system detects an unsafe operating condition, the high-concentration exhaust gas can be directly discharged to the chimney through the bypass pipeline, avoiding entering the combustion chamber and further improving the safety of the system. In addition, the bottom of the buffer tank is equipped with a condensate outlet, which can effectively discharge condensate and prevent condensate accumulation from affecting the operation of the system.

[0020] 4. Through the design of the heat storage chamber, the exhaust gas is preheated before entering the combustion chamber. The high-temperature gas after combustion is then heat-recovered through the heat storage chamber, which reduces energy consumption and improves the thermal efficiency of the system. The exhaust gas treatment efficiency is high (greater than 99%) and the thermal efficiency is high (greater than 95%), which can achieve green and environmentally friendly exhaust gas treatment.

[0021] In summary, the RTO system of this invention not only improves the safety of high-concentration waste gas treatment, but also achieves energy conservation, environmental protection, and efficient operation through efficient heat recovery and automated control, thus possessing high industrial application value. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the RTO system for treating high-concentration waste gas disclosed in this utility model.

[0023] Component designation explanation

[0024] 1. High-concentration exhaust gas inlet pipeline; 2. Oxygen concentration meter; 3. Fan; 4. Buffer tank; 5. Double shut-off valve; 6. Nitrogen purging device; 7. One-way valve; 8. Flame arrester; 9. Regenerative oxidizer; 10. Combustion chamber; 11. Regenerator chamber; 12. Ceramic regenerator; 13. Bypass pipeline; 14. Natural gas pipeline; 15. Combustion-supporting pipeline; 16. Ignition device. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Please see Figure 1This utility model provides an RTO system suitable for treating high-concentration waste gas, including a high-concentration waste gas inlet pipe 1, a regenerative thermal oxidizer 9, and a buffer tank 4. The regenerative thermal oxidizer 9 is equipped with a combustion chamber 10, and three regenerative chambers 11 are arranged in sequence below the combustion chamber 10. An ignition device 16 is provided at the top of the combustion chamber 10. The waste gas entering the regenerative thermal oxidizer 9 undergoes thermal oxidation, causing the organic compounds in the waste gas to be oxidized and decomposed into CO2 and H2O. The cleaned gas is discharged to the chimney through the waste gas outlet pipe. The high-concentration waste gas inlet pipe 1 is connected to the inlet end of the buffer tank 4 through a fan 3. The outlet end of the buffer tank 4 is connected to the combustion chamber 10 in the regenerative thermal oxidizer 9 in sequence through a double shut-off valve 5, a nitrogen purging device 6, a one-way valve 7, and a flame arrester 8. Among them, the double shut-off valve 5 can ensure that no waste gas leaks into the regenerative oxidizer 9 when the valve is closed; when the double shut-off valve 5 is shut off, the nitrogen purging device 6 purges the pipeline after the shut-off with nitrogen, which can ensure that the residual waste gas in the pipeline is sent into the regenerative oxidizer 9 for treatment, and can effectively prevent the high temperature heat radiation of the regenerative oxidizer 9 from reaching the front pipeline; the one-way valve 7 and the flame arrester 8 can prevent flame backfire and ensure the safety of the front pipeline equipment;

[0027] In one embodiment of this utility model, the outlet end of the buffer tank 4 is further provided with a bypass pipe 13, and the bypass pipe 13 is provided with a valve and a flame arrester 8; the bottom of the buffer tank 4 is also provided with a condensate outlet. The bypass pipe 13 is used to directly discharge the intake air to the chimney, and the bypass pipe 13 is only used in unsafe operating conditions.

[0028] In one embodiment of the present invention, a detection unit is provided on the high-concentration exhaust gas inlet pipe 1, the detection unit including an oxygen concentration meter 2 and an LEL gas detector.

[0029] The oxygen concentration meter 2 is used to monitor the oxygen content in the high-concentration waste gas, and the oxygen concentration meter 2 and the double shut-off valve 5 are interlocked. When the oxygen content is below 2%, the high-concentration waste gas is transported to the buffer tank 4 for buffering, and then pressurized to about 10 kPa by the blower 3 and enters the regenerative oxidizer 9 through a high-speed nozzle, either as fuel supplement or directly incinerated to meet emission standards. When the oxygen content reaches (i.e., greater than or equal to) 2%, the double shut-off valve 5 cuts off the intake of the high-concentration waste gas, allowing the high-concentration waste gas to be discharged through the bypass pipe 13 of the buffer tank 4, while the nitrogen purging device 6 purges and replaces the tail gas.

[0030] The detection unit also includes an LEL gas detector, which is used to monitor the concentration of exhaust gas in high-concentration exhaust gases. The LEL gas detector is used to control the VOC content in the intake air to be below 25% or 20% of the lower explosive limit (LEL) (when aromatic compounds account for more than 25% of the total VOCs), to ensure that explosive gases do not enter the regenerative oxidizer 9.

[0031] Preferably, the detection unit is located before the fan 3.

[0032] In one embodiment of the present invention, the heat storage chamber 11 includes heat storage chamber A, heat storage chamber B and heat storage chamber C in sequence, the heat storage chamber is filled with ceramic heat storage body 12, and the low concentration exhaust gas inlet pipe is connected to heat storage chamber A.

[0033] The exhaust gas first flows through heat storage chamber A and is heated to the oxidation temperature, during which the ceramic in heat storage chamber A cools down. After preheating, the organic matter in combustion chamber 10 is oxidized into carbon dioxide and water, and the exothermic oxidation reaction causes a further rise in air temperature. The purified exhaust gas (pure air) leaves combustion chamber 10 and flows through heat storage chamber B. In heat storage chamber B, the purified exhaust gas is cooled to the exhaust inlet temperature, transferring heat energy to the ceramic heat storage body 12 in heat storage chamber B. The ceramic heat storage body 12 can be used to recirculate and heat the exhaust gas. In heat storage chamber C, the exhaust gas, preheated by the exhaust gas in the previous cycle, is cooled and discharged after purification in heat storage chamber C. The periodic changes in the flow direction of each heat storage chamber are controlled by a valve system, allowing the ceramic heat storage bodies 12 in all heat storage chambers to be used for exhaust gas preheating and post-treatment gas cooling.

[0034] In one embodiment of the present invention, the ignition device 16 includes a controller on its top, which is connected to a natural gas pipe 14 and a combustion-supporting pipe 15 respectively. The natural gas pipe 14 and the combustion-supporting pipe 15 cooperate to control the temperature in the combustion chamber 10 to be controlled at 820°C to 850°C.

[0035] In summary, this invention, by incorporating a detection unit, can monitor the oxygen content and concentration in high-concentration exhaust gases in real time, ensuring that the oxygen content is below 2% and the VOC concentration is below 25% or 20% of the lower explosive limit. This effectively prevents safety accidents such as explosions. Furthermore, the entire RTO system can automatically adjust its operating mode based on the oxygen content, reducing manual intervention, improving the system's automation level and operational stability, and achieving energy conservation, environmental protection, and high-efficiency operation. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.

[0036] The terms used in this specification, such as "upper", "lower", "left", "right", "front", "back", "middle" and "one", are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit this utility model. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An RTO system suitable for high concentration waste gas treatment, characterized in that, The application relates to a regenerative oxidation furnace. The buffer tank is connected with the combustion chamber in the regenerative oxidation furnace through a double cut-off valve, a nitrogen blowing device, a check valve and a flame arrester. The buffer tank is also provided with a bypass pipeline, and the bypass pipeline is provided with a valve and a flame arrester. The bottom of the buffer tank is also provided with a condensate outlet.

2. The RTO system suitable for high concentration exhaust gas treatment according to claim 1, characterized in that, The detection unit comprises an oxygen concentration meter for monitoring the oxygen content in the high-concentration waste gas.

3. The RTO system suitable for high concentration exhaust gas treatment according to claim 2, characterized in that, When the oxygen content is lower than 2%, the high-concentration waste gas is pressurized by the fan and enters the regenerative oxidation furnace through a high-speed nozzle; when the oxygen content reaches 2%, the double cut-off valve cuts off the high-concentration waste gas, so that the high-concentration waste gas is treated by the bypass pipeline, and the nitrogen blowing device blows and replaces the tail gas.

4. The RTO system suitable for high concentration exhaust gas treatment according to any one of claims 1 to 3, characterized in that, The detection unit also comprises an LEL gas detector for monitoring the waste gas concentration in the high-concentration waste gas.

5. The RTO system suitable for high concentration exhaust gas treatment according to claim 4, characterized in that, The regenerative chambers comprise a regenerative chamber A, a regenerative chamber B and a regenerative chamber C in sequence, and the regenerative chambers are filled with ceramic regenerative bodies.

6. The RTO system suitable for high concentration exhaust gas treatment according to claim 4, characterized in that, The low-concentration waste gas inlet pipeline is connected with the regenerative chamber A.

7. The RTO system suitable for high concentration exhaust gas treatment according to claim 1, characterized in that, ​ 8. The RTO system suitable for high concentration exhaust gas treatment according to claim 7, characterized in that, ​

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