Waste gas treatment system
By mixing the exhaust gas with air and processing it in a catalytic combustion device, combined with the design of the emission and exhaust device, the problems of heat imbalance and fault impacts in exhaust gas treatment are solved, the continuity and safety of exhaust gas treatment are achieved, and the energy is reduced Consumption and risk.
Patent Information
- Application Number
- CN202421048617.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-15
AI Technical Summary
The prior art is difficult to effectively deal with exhaust gas generated by polymerization devices, resulting in environmental pollution, and heat imbalance during exhaust gas treatment increases control difficulty and cost.
A RCO waste gas treatment system was designed. By mixing the waste gas with air and reacting in a catalytic combustion device, and setting up an exhaust pipeline and an exhaust device to ensure that the waste gas reaches the appropriate concentration, reduce the difficulty and cost of reaction control, and to cause catalytic combustion. Exhaust gas in time when the device fails to enhance system stability and safety.
The continuity and integrity of the exhaust gas treatment process is achieved, energy consumption is reduced, the efficiency and safety of exhaust gas treatment is improved, and gas accumulation and potential risks of explosion or poisoning are avoided.
Smart Images
Figure CN222297949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of waste gas treatment, in particular to an RCO waste gas treatment system. Background Art
[0002] The polymerization unit uses terephthalic acid (PTA), 1,6-adipic acid (AA), and 1,4-butanediol (BDO) as raw materials, and adds special additives to produce polybutylene terephthalate adipate, referred to as PBAT, through direct esterification and continuous polycondensation process technology.
[0003] The polymerization unit, THF recovery unit and tank area of this project generate tail gas respectively. If these waste gases are not treated, they will pollute the environment. Therefore, the organic waste gas must be collected and properly treated. It can be discharged into the air only after being rendered harmless. At the same time, the discharged waste gas must minimize the pollution to the environment.
[0004] Therefore, it is a technical problem to be solved urgently to provide a RCO waste gas treatment system in the waste gas treatment field. Summary of the invention
[0005] The utility model aims to provide an exhaust gas treatment system, which can achieve the purpose of treating the exhaust gas after the exhaust gas and air are mixed to reach a suitable concentration, thereby preventing heat imbalance during the exhaust gas treatment process from increasing control difficulty and cost.
[0006] To achieve the above-mentioned purpose, the solution of the utility model is to provide an exhaust gas treatment system, including: an exhaust gas source and an air source, the exhaust gas source and the air source are connected to a mixing box through a pipeline, the mixing box is connected to a catalytic combustion device through a pipeline, the catalytic combustion device is connected to an exhaust device through a pipeline, the exhaust gas from the exhaust gas source and the air from the air source are mixed in the mixing box and then introduced into the catalytic combustion device for reaction, and the exhaust gas after the reaction is introduced into the exhaust device for discharge; after the exhaust gas and the air are mixed to reach an appropriate concentration and then enter the catalytic combustion device for reaction, it can reduce the control difficulty and cost of the reaction and enhance safety.
[0007] Furthermore, an exhaust pipeline is provided on the air mixing box, and a valve is provided on the exhaust pipeline. When the catalytic combustion device fails, the valve on the exhaust pipeline is opened to discharge the gas in the air mixing box. The failure of the catalytic combustion device may cause the waste gas treatment process to be interrupted, thereby affecting the stable operation of the entire production line. Through the setting of the exhaust pipeline, even if the catalytic combustion device fails, the gas in the air mixing box can be discharged in time, avoiding the impact on other parts of the system, thereby enhancing the stability of the system.
[0008] Furthermore, the exhaust device includes an exhaust fan and an exhaust tower. The exhaust fan is respectively connected to the catalytic combustion device and the exhaust tower through pipelines. The exhaust gas discharged from the catalytic combustion device is passed through the exhaust fan into the exhaust tower for discharge. The exhaust fan serves as a power source, and transports the treated exhaust gas from the catalytic combustion device to the exhaust tower through pipelines, thereby realizing the discharge of the exhaust gas. This design ensures the continuity and integrity of the exhaust gas treatment process. The design of the exhaust device has certain flexibility. The power of the exhaust fan and the size of the exhaust tower can be adjusted according to actual needs to adapt to the exhaust gas emission needs of different scales.
[0009] Furthermore, the discharge pipeline is connected to the exhaust device to discharge the gas in the air mixing box when the catalytic combustion device fails. Such timely discharge avoids the accumulation of gas in the air mixing box, reduces the potential risk of explosion or poisoning, and ensures the timeliness and effectiveness of fault response.
[0010] Furthermore, the discharge pipeline is connected to a pipeline connected between the exhaust tower and the exhaust fan.
[0011] Furthermore, the catalytic combustion device comprises a plurality of interconnected catalytic combustion chambers.
[0012] Furthermore, the catalytic combustion chamber includes a heat exchange device and a catalytic bed. The exhaust gas first enters the heat exchange device for heat exchange and temperature rise and then enters the catalytic bed for reaction and combustion. The heat energy generated by the reaction and combustion of the exhaust gas at the catalytic bed enters the heat exchange device to heat the gas to reach the reaction temperature. The heat exchange device in the catalytic combustion chamber can recover the heat energy generated by the reaction and combustion of the exhaust gas on the catalytic bed, and then use this heat energy to preheat the exhaust gas entering the catalytic combustion chamber. This heat energy recovery and reuse mechanism significantly improves the utilization efficiency of heat energy, reduces energy consumption, and helps to achieve the goals of energy conservation and environmental protection.
[0013] Furthermore, a heating device is provided between the heat exchange device and the catalytic bed. When the exhaust gas has not yet reached the reaction temperature after being heated by the heat exchange device, the exhaust gas is heated by the heating device to reach the reaction temperature. In the exhaust gas treatment process, it is crucial to ensure that the exhaust gas reaches a suitable reaction temperature. By adding a heating device, when the exhaust gas has not yet reached the reaction temperature after being heated by the heat exchange device, the exhaust gas can be further heated to ensure that it reaches the ideal reaction temperature. This design ensures the stability of the reaction temperature, thereby improving the efficiency and effect of the exhaust gas treatment.
[0014] Furthermore, a flame arrester is provided on the pipeline connecting the mixing box and the catalytic combustion device. The main function of the flame arrester is to prevent the generation of flames or explosion points. During the waste gas treatment process, due to the complex composition of the waste gas, there may sometimes be flammable and explosive substances. The setting of the flame arrester can effectively prevent the spread of flames in the pipeline, thereby preventing the generation of explosion points and ensuring the safety of equipment and personnel. Secondly, the flame arrester can prevent the flame from flowing back. During the catalytic combustion process, if the flame flows back to the mixing box, it may affect the gas in the mixing box and even cause safety problems. The presence of the flame arrester can block the backflow of the flame and avoid adverse effects on the gas in the mixing box.
[0015] Furthermore, a valve is provided on the pipeline connecting the air mixing box and the flame arrester, and the valve is closed when the catalytic combustion device fails.
[0016] Preferably, the waste gas source includes but is not limited to polymerization unit waste gas, THF recovery unit waste gas and tank area waste gas.
[0017] Preferably, an adsorption device is provided on the pipeline connecting the catalytic combustion device and the exhaust fan, and the adsorption device is used to filter out undecomposed pollutants in the exhaust gas; although the catalytic combustion device can effectively decompose most of the pollutants, there may be a small amount of residues. At this time, the adsorption device plays a key role. It can capture and adsorb these undecomposed pollutants, thereby ensuring that the discharged exhaust gas is cleaner and harmless.
[0018] Preferably, an adsorption device is provided on the discharge pipeline, and the adsorption device is used to filter undecomposed pollutants in the exhaust gas in an emergency state.
[0019] Advantages of this utility model:
[0020] The exhaust gas is treated after being mixed with air to reach a suitable concentration, which prevents heat imbalance in the catalytic combustion chamber during the exhaust gas treatment process, increasing the difficulty and cost of control and avoiding danger; by setting up an emission pipeline, when a fault occurs in the catalytic combustion chamber, the exhaust gas in the mixing box can be released in time. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of an exhaust gas treatment system provided by the utility model;
[0022] As shown in the figure, 1-air mixing box, 2-exhaust pipeline, 3-exhaust tower, 4-catalytic combustion chamber, 5-exhaust fan. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.
[0024] A waste gas treatment system comprises: a waste gas source and an air source, wherein the waste gas source and the air source are connected to an air mixing box 1 through a pipeline, the air mixing box 1 is connected to a catalytic combustion device through a pipeline, and the catalytic combustion device is connected to an exhaust device through a pipeline, and the waste gas from the waste gas source and the air from the air source are mixed in the air mixing box 1 and then introduced into the catalytic combustion device for reaction, and the waste gas after the reaction is introduced into the exhaust device for discharge; after the waste gas and the air are mixed to reach a suitable concentration and then enter the catalytic combustion device for reaction, the control difficulty and cost of the reaction can be reduced and the safety can be enhanced.
[0025] The air mixing box 1 is provided with an exhaust pipeline 2, and the exhaust pipeline 2 is provided with a valve. When the catalytic combustion device is working normally, the valve on the exhaust pipeline 2 remains closed. The front end of the catalytic combustion equipment is equipped with an LEL concentration detection to feedback the concentration and warn of the risk of mixed explosion of intake pollutants. When the intake concentration exceeds the lower limit of the mixed explosion of intake pollutants by 50%, the valve in front of the catalytic combustion device is closed, and the valve on the exhaust pipeline 2 is opened to discharge the gas in the air mixing box 1. Failure or even explosion of the catalytic combustion device will cause the waste gas treatment process to be interrupted, thereby affecting the stable operation of the entire production line. Through the setting of the exhaust pipeline 2, when there is a risk of explosion, the gas in the air mixing box 1 can be discharged in time to quickly reduce the waste gas concentration, thereby enhancing the safety of the system.
[0026] The exhaust device includes an exhaust fan 5 and an exhaust tower 3. The exhaust fan 5 is connected to the catalytic combustion device and the exhaust tower 3 respectively through pipelines. The exhaust gas discharged from the catalytic combustion device is passed into the exhaust tower 3 through the exhaust fan 5 for discharge. The exhaust fan 5 serves as a power source and transports the treated exhaust gas from the catalytic combustion device to the exhaust tower 3 through a pipeline, thereby realizing the discharge of the exhaust gas. This design ensures the continuity and integrity of the exhaust gas treatment process. The design of the exhaust device has certain flexibility. The power of the exhaust fan 5 and the size of the exhaust tower 3 can be adjusted according to actual needs to meet the exhaust gas emission requirements of different scales; the discharge pipeline 2 is connected to the exhaust device to discharge the gas in the mixing box 1 when the catalytic combustion device fails. This timely discharge avoids the accumulation of gas in the mixing box 1, reduces the potential risk of explosion or poisoning, and ensures the timeliness and effectiveness of fault response; the discharge pipeline 2 is connected to the pipeline connected between the exhaust tower 3 and the exhaust fan 5.
[0027] The catalytic combustion device includes two catalytic combustion chambers 4 connected in series; the catalytic combustion chamber 4 includes a heat exchange device and a catalyst bed, the exhaust gas first enters the heat exchange device for heat exchange and temperature rise, and then enters the catalytic bed for reaction and combustion, the heat energy generated by the reaction and combustion of the exhaust gas at the catalytic bed enters the heat exchange device to heat the gas to reach the reaction temperature, the heat exchange device in the catalytic combustion chamber 4 can recover the heat energy generated by the reaction and combustion of the exhaust gas in the catalytic bed, and then use this heat energy to preheat the exhaust gas entering the catalytic combustion chamber 4, this heat energy recovery and reuse mechanism significantly improves the utilization efficiency of heat energy and reduces energy consumption. The invention reduces the consumption of energy, helps to achieve the goals of energy conservation and environmental protection; a heating device is also provided between the heat exchange device and the catalyst bed. When the exhaust gas has not reached the reaction temperature after being heated by the heat exchange device, the exhaust gas is heated by the heating device to reach the reaction temperature; in the exhaust gas treatment process, it is very important to ensure that the exhaust gas reaches a suitable reaction temperature. By adding a heating device, when the exhaust gas has not reached the reaction temperature after being heated by the heat exchange device, the exhaust gas can be further heated to ensure that it reaches the ideal reaction temperature; this design ensures the stability of the reaction temperature, thereby improving the efficiency and effect of the exhaust gas treatment.
[0028] A flame arrester is provided on the pipeline connecting the mixing box 1 and the catalytic combustion device. The main function of the flame arrester is to prevent the generation of flames or explosion points. In the process of waste gas treatment, due to the complex composition of the waste gas, flammable and explosive substances may sometimes exist. The setting of the flame arrester can effectively prevent the spread of flames in the pipeline, thereby preventing the generation of explosion points and ensuring the safety of equipment and personnel. Secondly, the flame arrester can prevent the flame from flowing back. In the process of catalytic combustion, if the flame flows back to the mixing box 1, it may affect the gas in the mixing box 1 and even cause safety problems. The presence of the flame arrester can block the backflow of the flame and avoid adverse effects on the gas in the mixing box 1. A valve is provided on the pipeline connecting the mixing box 1 and the flame arrester, and the valve is closed when the catalytic combustion device fails.
[0029] The exhaust gas sources include but are not limited to polymerization unit exhaust gas, THF recovery unit exhaust gas and tank area exhaust gas; an adsorption device is provided on the pipeline connecting the catalytic combustion device and the exhaust fan 5, and an adsorption device is provided on the discharge pipeline 2, and the adsorption device is used to filter undecomposed pollutants in the exhaust gas in an emergency; although the catalytic combustion device can effectively decompose most of the pollutants, there may be a small amount of residues. At this time, the adsorption device plays a key role. It can capture and adsorb these undecomposed pollutants, thereby ensuring that the discharged exhaust gas is cleaner and harmless.
[0030] The specific working process is as follows: the waste gas from the polymerization unit, the waste gas from the THF recovery unit and the waste gas from the tank area are introduced into the mixing box 1, and then the dry air in the air source is introduced into the mixing box 1, and the mixed waste gas enters the catalytic combustion chamber 4, and the waste gas first enters the heat exchange device for heat exchange and temperature increase, and then the waste gas is heated by the heating device to reach the reaction temperature and then enters the catalytic bed for reaction and combustion, and the waste gas is discharged from the catalytic combustion chamber 4 and then enters the exhaust tower 3 through the exhaust fan 5 for discharge; when a failure occurs in the catalytic combustion chamber 4, the valve on the pipeline connecting the mixing box 1 and the flame arrester is closed, and the valve on the discharge pipeline 2 is opened to discharge the gas in the mixing box 1 to avoid accidents.
[0031] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
Claims
1. An exhaust gas treatment system, characterized in that: include: An exhaust gas source and an air source, the exhaust gas source and the air source are connected to an air mixing box (1) via a pipeline, the air mixing box (1) is connected to a catalytic combustion device via a pipeline, the catalytic combustion device is connected to an exhaust device via a pipeline, the exhaust gas from the exhaust gas source and the air from the air source are mixed in the air mixing box (1) and then introduced into the catalytic combustion device for reaction, and the exhaust gas after the reaction is introduced into the exhaust device for discharge.
2. An exhaust gas treatment system according to claim 1, characterized in that: The air mixing box (1) is provided with a discharge pipeline (2), and the discharge pipeline (2) is provided with a valve. When the catalytic combustion device fails, the valve on the discharge pipeline (2) is opened to discharge the gas in the air mixing box (1).
3. An exhaust gas treatment system according to claim 2, characterized in that: The exhaust device comprises an exhaust fan (5) and an exhaust tower (3); the exhaust fan (5) is connected to the catalytic combustion device and the exhaust tower (3) respectively through pipelines; the exhaust gas discharged from the catalytic combustion device is passed through the exhaust fan (5) into the exhaust tower (3) for discharge.
4. An exhaust gas treatment system according to claim 3, characterized in that: The discharge pipeline (2) is connected to the exhaust device and is used to discharge the gas in the air mixing box (1) when the catalytic combustion device fails.
5. An exhaust gas treatment system according to claim 4, characterized in that: The discharge pipeline (2) is connected to a pipeline connected between the exhaust tower (3) and the exhaust fan (5).
6. An exhaust gas treatment system according to claim 5, characterized in that: The catalytic combustion device comprises a plurality of interconnected catalytic combustion chambers (4).
7. An exhaust gas treatment system according to claim 6, characterized in that: The catalytic combustion chamber (4) comprises a heat exchange device and a catalytic bed. The exhaust gas first enters the heat exchange device for heat exchange and temperature rise and then enters the catalytic bed for reaction and combustion. The heat energy generated by the reaction and combustion of the exhaust gas in the catalytic bed enters the heat exchange device to heat the gas to reach the reaction temperature.
8. An exhaust gas treatment system according to claim 7, characterized in that: A heating device is also provided between the heat exchange device and the catalyst bed. When the exhaust gas has not yet reached the reaction temperature after being heated by the heat exchange device, the exhaust gas is heated by the heating device to reach the reaction temperature.
9. The exhaust gas treatment system according to claim 1, characterized in that: A flame arrester is provided on the pipeline connecting the air mixing box (1) and the catalytic combustion device.
10. An exhaust gas treatment system according to claim 9, characterized in that: A valve is provided on the pipeline connecting the air mixing box (1) and the flame arrester, and the valve is closed when the catalytic combustion device fails.