An organic waste gas purification system and operating method

Abstract

This invention discloses an organic waste gas purification system and its operation method, comprising a desorption device, a cyclone mixing spray device, a dry filter device, an adsorption device, and a chimney connected in sequence. The adsorption device includes an adsorption fan and multiple parallel adsorption beds, each containing activated carbon. Each adsorption bed has an adsorption inlet equipped with an adsorption inlet valve, an adsorption outlet equipped with an adsorption outlet valve, a desorption inlet equipped with a desorption inlet valve, and a desorption outlet equipped with a desorption outlet valve. The desorption device includes a catalytic decomposition bed and a desorption fan. Inside the catalytic decomposition bed, a catalyst layer and a heat exchanger are arranged in sequence. The hot side of the heat exchanger is located within the catalytic decomposition bed. The outlet of the catalytic decomposition bed is connected to the inlets of multiple desorption inlet valves via a desorption inlet pipe. The cold side inlet of the heat exchanger is connected to the outlets of multiple desorption outlet valves via a desorption outlet pipe, while the cold side outlet of the heat exchanger is connected to the inlet of the catalytic decomposition bed. The system offers high purification efficiency, low operating costs, and no secondary pollution.

Description

Technical Field

[0001] This invention relates to the technical field of waste gas treatment and purification, and particularly to an organic waste gas purification system and its operation method. Background Technology

[0002] VOCs are one of many types of waste gases. Their main pollutants are benzene, toluene, xylene, and other VOCs. If left untreated, they cause significant air pollution to the surrounding environment and seriously affect the health of the surrounding population.

[0003] Existing organic waste gas treatment systems generally employ a combination of adsorption and desorption. However, these systems suffer from several drawbacks, including high energy consumption, susceptibility to clogging, secondary emissions, the inability to perform adsorption and desorption simultaneously, making it difficult to guarantee continuous production, and poor temperature regulation in pipelines, leading to significant safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide an organic waste gas purification system and operating method to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows:

[0006] This invention provides an organic waste gas purification system, comprising: a desorption device, a cyclone mixing spray device, a dry filter device, an adsorption device, and a chimney, all connected in sequence via ducts. The adsorption device includes an adsorption fan and multiple parallel adsorption beds, each containing activated carbon. Each adsorption bed has an adsorption inlet equipped with an adsorption inlet valve, an adsorption outlet equipped with an adsorption outlet valve, a desorption inlet equipped with a desorption inlet valve, and a desorption outlet equipped with a desorption outlet valve. The desorption device includes a catalytic decomposition bed and a desorption fan. Inside the catalytic decomposition bed, a catalyst layer and a heat exchanger are sequentially arranged along the gas flow direction. The hot side of the heat exchanger is located within the catalytic decomposition bed. The outlet of the catalytic decomposition bed is connected to the inlets of the multiple desorption inlet valves via a desorption inlet pipe. The cold side inlet of the heat exchanger is connected to the outlets of the multiple desorption outlet valves via a desorption outlet pipe, while the cold side outlet of the heat exchanger is connected to the inlet of the catalytic decomposition bed.

[0007] The beneficial effects of this organic waste gas purification system are as follows: During operation, after the cyclone-mixed spray device removes particulate matter and water mist from the waste gas containing particulate matter, the dry filtration device is used to purify the particulate matter and water mist that the cyclone-mixed spray device failed to remove, ensuring the purification efficiency and service life of the adsorption bed. The organic waste gas with most of the water mist and particulate matter removed is then passed into the adsorption bed, where activated carbon's strong adsorption properties for organic matter purify the gas. The treated gas meets emission standards. When the activated carbon in one adsorption bed becomes saturated, the desorption device is activated. The adsorption bed system operates in a multi-use, one-standby state; during desorption, one standby adsorption bed is activated while the saturated adsorption bed is shut down. To ensure normal production needs, the adsorption bed after desorption is put into standby mode, thus repeating the desorption cycle. During adsorption, the high-concentration waste gas after adsorption by activated carbon is preheated to the catalytic oxidation temperature on the cold side of the heat exchanger before entering the catalytic decomposition bed. The high-concentration waste gas generates a large amount of heat energy during the catalytic oxidation in the catalyst layer, which is used to heat the high-concentration waste gas on the cold side of the heat exchanger. This heat is then used to recover and heat the desorbed gas entering the catalytic decomposition bed, thereby reducing energy consumption and improving the efficiency of catalytic decomposition. In addition, some heat is also carried back into the adsorption bed with the desorbed gas, where the high-concentration waste gas undergoes flameless combustion and is oxidized and decomposed into CO2 and H2O. This results in high purification efficiency, low operating costs, and no secondary pollution.

[0008] As a further improvement to the above technical solution, the catalytic decomposition bed is provided with an electrically heated layer located on the air inlet side of the catalyst layer.

[0009] In order to ensure that the desorption gas flow can be accurately maintained at the efficient temperature of catalytic decomposition, this scheme is equipped with an electric heating layer to actively heat the desorption gas flow, wherein the catalytic combustion temperature is 280-320°.

[0010] As a further improvement to the above technical solution, a temperature control valve is connected between the desorption outlet pipe and the desorption inlet pipe.

[0011] The temperature control valve in this scheme is mainly used to regulate the temperature of the desorption gas flow before entering the adsorption bed. If the temperature of the desorption gas flow from the catalytic decomposition bed is too high, the opening of the temperature control valve is increased accordingly, and the desorption gas flow directly flows back to the catalytic decomposition bed through the temperature control valve. It can also regulate the flow rate of the desorption gas flow.

[0012] As a further improvement to the above technical solution, the desorption fan is connected in series with the desorption inlet pipe, and the temperature control valve is located at the outlet of the desorption fan.

[0013] This scheme provides power to the desorption gas flow through a desorption fan. The desorption gas flow, after being pressurized by the desorption fan, directly enters the adsorption bed, and can also be directly returned to the catalytic decomposition bed through a temperature control valve.

[0014] As a further improvement to the above technical solution, the outlet of the catalytic decomposition bed is connected to a first release valve that communicates with the outside. The first release valve is mainly used to actively regulate the temperature of the desorption pipeline. If the desorption temperature from the catalytic decomposition bed is too high, the first release valve is automatically opened to draw fresh air from outside into the desorption pipeline to ensure that the desorption pipeline is controlled between 100-120 degrees Celsius (adjustable) for dilution and cooling. This ensures that the gas temperature does not rise too high to the desorption temperature of the adsorption bed, which could lead to heat accumulation and ignition. When the temperature drops to 100-120 degrees Celsius, the first release valve is automatically closed to ensure the safe operation of the system.

[0015] As a further improvement to the above technical solution, the desorption outlet pipe is connected to a second release valve that communicates with the outside.

[0016] The second release valve is mainly used to actively regulate the temperature of the adsorption bed. The adsorption bed has multiple temperature control probes that monitor the average heated temperature of the adsorption bed and control it between 110-120 degrees Celsius (adjustable). If the temperature of the adsorption bed is too high, the second release valve will automatically open to introduce fresh air into the adsorption bed for dilution and cooling, ensuring that the desorption temperature of the adsorption bed is not too high, which may cause heat accumulation and fire. When the temperature drops to 110-120 degrees Celsius, the second release valve will automatically close to ensure the safe operation of the system.

[0017] As a further improvement to the above technical solution, the desorption inlet pipe is connected to a cooling supply pipe, and the cooling supply pipe is equipped with a cooling fan.

[0018] The supplementary cooling fan in this scheme mainly supplies fresh desorbed gas to the desorption inlet pipe, while the high-temperature desorbed gas flow from the catalytic decomposition bed mixes with the fresh desorbed gas, thus regulating the temperature of the desorbed gas flow entering the adsorption bed.

[0019] As a further improvement to the above technical solution, thermocouples are installed in both the catalytic decomposition bed and the adsorption bed, and a fire sprinkler system is also included, which is connected to the catalytic decomposition bed and the adsorption bed. The temperature inside the catalytic decomposition bed and the adsorption bed is monitored by the thermocouples. If the temperature is too high, combustion may occur. When the temperature of the adsorption bed reaches 130 degrees Celsius, the fire sprinkler system is activated to spray water and cool the bed, effectively preventing the risk of fire.

[0020] As a further improvement to the above technical solution, the cyclone hybrid spray device includes multiple high-efficiency cyclone towers, and the dry filtration device includes multiple dry filters, with each high-efficiency cyclone tower and dry filter connected individually. The coordinated operation of the high-efficiency cyclone towers and dry filters improves the removal of particulate matter and water mist from organic waste gas containing particulate matter, achieving two-stage particulate matter filtration. Simultaneously, it facilitates inspection and maintenance; if one set of high-efficiency cyclone towers and dry filters malfunctions, the operation of that set can be stopped, while the other sets can continue to operate normally.

[0021] Furthermore, the present invention also provides an operation method for an organic waste gas purification system, which employs the aforementioned organic waste gas purification system, and the specific method is as follows:

[0022] First, the exhaust gas enters the cyclone mixing spray device to remove particulate matter and water mist;

[0023] Then, it enters the dry filtration unit to further remove particulate matter and water mist;

[0024] The waste gas is then passed into the adsorption bed, where activated carbon adsorbs the organic waste gas, thus purifying the gas.

[0025] Finally, the purified gas is discharged through the chimney.

[0026] When the activated carbon in one of the adsorption beds becomes saturated, the adsorption inlet and outlet valves of that adsorption bed are closed, and the desorption inlet and outlet valves are opened. Under the operation of the desorption fan, the high-temperature desorption gas flow enters the adsorption bed, and the activated carbon releases the adsorbed volatile organic compounds to achieve desorption of the activated carbon. The high-concentration waste gas is preheated on the cold side of the heat exchanger before entering the catalytic decomposition bed. Under the action of the catalyst layer, flameless combustion occurs, and the gas is oxidized and decomposed into CO2 and H2O, releasing a large amount of heat energy. Part of this heat is used to heat the desorbed high-concentration waste gas through the heat exchanger, and the other part is used to heat and catalyze the activated carbon with the desorption gas flow.

[0027] During activated carbon desorption, the desorption temperature of activated carbon and the catalytic oxidation temperature of the catalytic decomposition bed are controlled by a temperature control valve, a desorption fan, a first release valve, and a second release valve. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0029] Figure 1 This is a schematic diagram of an embodiment of the organic waste gas purification system provided by the present invention. Detailed Implementation

[0030] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, if there are words such as "several", they mean one or more, "multiple" means two or more, "greater than", "less than", "exceeding" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] Reference Figure 1 The organic waste gas purification system of the present invention is illustrated in the following embodiments:

[0035] The organic waste gas purification system implemented here includes a desorption device, an adsorption device, a cyclone hybrid spray device, a chimney 100, and a dry filtration device.

[0036] The cyclone hybrid spray device includes multiple high-efficiency cyclone towers 600. The inlets of the multiple high-efficiency cyclone towers 600 are connected to the main collection pipeline. In this embodiment, the high-efficiency cyclone towers 600 are equipped with a special cyclone guiding structure. After the organic waste gas containing particulate matter from the production workshop enters the high-efficiency cyclone towers 600 through the main collection pipeline, it will generate a high-speed cyclone through the special cyclone guiding structure. The organic waste gas containing particulate matter comes into full contact with the spray water in the tower for washing. The washed particulate matter is thrown to the wall of the cyclone tank by the centrifugal force generated during the cyclone. Finally, the spray water washes it down into the particulate matter recovery tank. When the organic waste gas with particulate matter removed and water mist is passing through the dehydration layer, it must come into contact with the multifaceted spheres. The multifaceted spheres have a large specific surface area and a hydrophilic surface, which allows the water mist components in the organic waste gas to adhere to their surface. After the water mist is removed, the organic waste gas enters the next process.

[0037] The dry filtration device includes multiple dry filters 700. The inlets of the dry filters 700 are connected to the outlets of the high-efficiency cyclone tower 600 through pipes. In this embodiment, in order to ensure the purification efficiency and service life of the adsorption device, an additional particulate filter is set before the adsorption device. Dry particulate filter material is used to purify the particulate matter that the high-efficiency cyclone tower 600 fails to remove. Its working principle is as follows: using a special dry particulate filter material as the core component, the exhaust gas that was not cleaned in the previous process passes through multiple layers of gradually denser flame-retardant glass fiber material. The particulate matter is intercepted, collided, and absorbed, and is contained in the material and agglomerated, thereby achieving the purpose of purifying the particulate matter.

[0038] This improves the removal of particulate matter and water mist from organic waste gas containing particulate matter, achieving two-stage particulate matter and water mist filtration. It also facilitates inspection and maintenance. If one set of high-efficiency cyclone tower 600 and dry filter 700 malfunctions, the operation of that set of high-efficiency cyclone tower 600 and dry filter 700 can be stopped, while the other sets can continue to operate normally.

[0039] The adsorption device includes multiple adsorption beds 300, which are arranged in parallel. The inlet of each adsorption bed 300 is connected to the outlet of multiple dry filters 700 through a pipe, and the outlet of each adsorption bed 300 is connected to a chimney 100 through a pipe.

[0040] In this embodiment, an adsorption fan 200 is also provided at the outlet of multiple adsorption beds 300 and the chimney 100 to increase the flow speed and flow rate of the exhaust gas.

[0041] The adsorption bed 300 contains honeycomb-shaped activated carbon 310. Activated carbon 310 has several advantages over other adsorbents: it has a wide pore size distribution, well-developed micropores, and a fast adsorption process, enabling it to adsorb substances of different molecular sizes. It is very effective in adsorbing and recovering VOCs such as benzene, ethyl acetate, and chloroform. Its non-polar and hydrophobic surface properties give it good selectivity for the adsorption of non-polar substances. Furthermore, the raw materials for activated carbon 310 are inexpensive and abundant, the preparation process is simple, and it is easy to desorb and regenerate. Based on these advantages, activated carbon 310 has been widely used as an adsorbent to treat low-concentration, large-volume VOCs with medium relative molecular mass (usually about 45-130). In particular, activated carbon 310 prepared by the phosphoric acid method using wood granules has advantages such as large adsorption capacity, small desorption residue, and economical and environmentally friendly preparation process.

[0042] Utilizing the microporous adsorption properties of activated carbon 310 to adsorb organic waste gas is one of the most effective industrial treatment methods. Activated carbon 310 is a general term for many carbon-based materials with adsorption properties. After activation treatment, its specific surface area can generally reach 700-1000 m². 2 / g, possessing excellent and broad adsorption capacity. Adsorption can achieve a purification efficiency of up to 90-95% for organic waste gas. It can adsorb most organic gases, such as benzenes, aldehydes, ketones, alcohols, hydrocarbons, and malodorous substances. After saturation, activated carbon 310 can be desorbed and regenerated with hot air, allowing the activated carbon to be reused.

[0043] However, activated carbon 310 itself has a certain catalytic effect, which is more pronounced at certain temperatures. During the catalytic decomposition of organic waste gas, a certain amount of heat is generated. During desorption, activated carbon 310 releases most of the adsorbed volatile organic compounds after being exposed to external heat, but some organic compounds with higher flash points remain in the activated carbon. If too much activated carbon accumulates, and the activated carbon 310 cannot quickly dissipate heat after desorption, the high-temperature activated carbon 310 will continue to react with the remaining organic compounds, generating even higher temperatures, ultimately leading to the activated carbon 310 igniting. If the thickness of the activated carbon 310 stack is reduced and it is stacked in multiple layers, and the cooling fan continues to run after desorption to automatically shut off when the temperature of the adsorption bed 300 drops below 60 degrees Celsius (adjustable), the problem of heat accumulation in the activated carbon 310 can be effectively solved, and the probability of activated carbon 310 ignition can be effectively reduced.

[0044] The organic waste gas, after removing most of the water mist and particulate matter, is then passed into an adsorption bed 300 containing honeycomb activated carbon 310. The gas comes into full contact with the honeycomb activated carbon 310, and the gas is purified by utilizing the strong adsorption properties of activated carbon 310 for organic matter. The treated gas can be discharged in compliance with standards.

[0045] The adsorption bed 300 has an adsorption inlet, an adsorption outlet, a desorption inlet, and a desorption outlet. The adsorption inlet is equipped with an adsorption inlet valve 320, the adsorption outlet is equipped with an adsorption outlet valve 330, the desorption inlet is equipped with a desorption inlet valve 340, and the desorption outlet is equipped with a desorption outlet valve 350. The adsorption inlet is connected to the outlet of multiple dry filters 700 through a pipe, and the adsorption inlet is connected to the inlet of the adsorption fan 200 through a pipe.

[0046] The desorption device in this embodiment includes a catalytic decomposition bed 400 and a desorption fan 800. The catalytic decomposition bed 400 is provided with a catalyst layer 410 and a heat exchanger 420. The catalyst layer 410 and the heat exchanger 420 are installed sequentially along the gas flow direction. The hot side of the heat exchanger 420 is located inside the catalytic decomposition bed 400. The outlet of the catalytic decomposition bed 400 is connected to a plurality of desorption inlet valves 340 through a desorption inlet pipe 430. The inlet of the cold side of the heat exchanger 420 is connected to the outlet of a plurality of desorption outlet valves 350 through a desorption outlet pipe 440. The cold side outlet of the heat exchanger 420 is connected to the inlet of the catalytic decomposition bed 400 through a pipe.

[0047] After the activated carbon 310 is saturated with adsorption, hot air is used to desorb the organic waste gas inside the activated carbon 310. By controlling the flow rate of the desorption process, the concentration of organic waste gas can be concentrated by 10-20 times. The desorbed gas flow is ignited under the set temperature and the action of the catalyst. The purification efficiency of the catalytic decomposition process can reach more than 97%. After decomposition, CO2 and H2O are generated and a large amount of heat is released.

[0048] The catalytic decomposition bed 400 uses high-quality precious metals palladium and platinum supported on honeycomb ceramics as catalysts. The catalytic decomposition rate reaches over 99%. It features a high specific surface area, high reaction space velocity, long life, low decomposition temperature, low resistance, short desorption preheating time, low energy consumption, high mechanical strength, wear resistance, thermal shock resistance, and good catalytic activity and thermal stability.

[0049] When the activated carbon 310 in one of the adsorption beds 300 becomes saturated, the desorption device is started. The adsorption bed 300 is in a multi-use, one-standby state. During desorption, one standby adsorption bed 300 is turned on and the adsorption bed 300 that has become saturated is turned off to carry out desorption, so as to ensure normal production needs. The adsorption bed 300 that has completed the desorption work enters the standby state, and the desorption is carried out in this cycle.

[0050] During adsorption, the high-concentration waste gas adsorbed by activated carbon 310 is preheated to the catalytic oxidation temperature on the cold side of heat exchanger 420 before entering the catalytic decomposition bed 400. The high-concentration waste gas generates a large amount of heat energy during the catalytic oxidation in the catalyst layer 410, which heats the high-concentration waste gas on the cold side of heat exchanger 420. This heat is used to recover and heat the desorbed gas entering the catalytic decomposition bed 400, thereby reducing energy consumption and improving the efficiency of catalytic decomposition. In addition, some heat is also carried back into the adsorption bed 300 with the desorbed gas, where the high-concentration waste gas undergoes flameless combustion and is oxidized and decomposed into CO2 and H2O. This results in high purification efficiency, low operating costs, and no secondary pollution.

[0051] Furthermore, the catalytic decomposition bed 400 is provided with an electric heating layer 450, which is located on the air inlet side of the catalyst layer 410. In order to ensure that the desorption gas flow can be accurately maintained at the high-efficiency temperature of catalytic decomposition, this embodiment provides an electric heating layer 450 to actively heat the desorption gas flow, wherein the catalytic combustion temperature is 280-320°.

[0052] Furthermore, a temperature control pipe is installed between the desorption outlet pipe 440 and the desorption inlet pipe 430. The temperature control pipe is equipped with a temperature control regulating valve 460. The temperature control regulating valve 460 is mainly used to regulate the temperature of the desorption gas flow before entering the adsorption bed 300. If the temperature of the desorption gas flow coming out of the catalytic decomposition bed 400 is too high, the opening of the temperature control regulating valve 460 is increased accordingly, and the desorption gas flow directly flows back to the catalytic decomposition bed 400 through the temperature control regulating valve 460. It can also regulate the flow rate of the desorption gas flow.

[0053] In this embodiment, the desorption fan 800 is installed in the desorption inlet pipe 430, and the temperature control valve 460 is located on the outlet side of the desorption fan 800. The desorption fan 800 provides power to the desorption airflow, and the desorption airflow pressurized by the desorption fan 800 directly enters the adsorption bed 300, and can also be directly returned to the catalytic decomposition bed 400 through the temperature control valve 460.

[0054] This embodiment also includes a first release valve 470 and a second release valve 480. The inlet of the first release valve 470 is connected to the outlet of the catalytic decomposition bed 400, and the inlet of the second release valve 480 is connected to the desorption outlet pipe 440. The first release valve 470 is mainly used to actively regulate the temperature of the desorption pipe. If the desorption temperature from the catalytic decomposition bed 400 is too high, the first release valve 470 is automatically opened to draw fresh air from outside into the desorption pipe to ensure that the temperature of the desorption pipe is controlled between 100-120 degrees Celsius (adjustable) for dilution and cooling. This ensures that the gas temperature does not rise too high to avoid the heat accumulation that could lead to a fire. When the temperature drops to 100-120 degrees Celsius, the first release valve 470 is automatically closed to ensure the safe operation of the system.

[0055] The second release valve 480 is mainly used to actively regulate the temperature of the adsorption bed 300. The adsorption bed 300 has multiple temperature control probes that monitor the average heated temperature of the adsorption bed and control it between 110-120 degrees Celsius (adjustable). If the temperature of the adsorption bed 300 is too high, the second release valve 480 will automatically open to introduce fresh air into the adsorption bed 300 for dilution and cooling, ensuring that the desorption temperature of the adsorption bed 300 does not become too high and cause heat accumulation leading to fire. When the temperature drops to 110-120 degrees Celsius, the release valve will automatically close to ensure the safe operation of the system.

[0056] In addition, this embodiment also includes a cooling pipe 500, which is connected to the desorption inlet pipe 430. The cooling pipe 500 is equipped with a cooling fan 510, which mainly supplies fresh desorption gas to the desorption inlet pipe 430. The high-temperature desorption gas flow from the catalytic decomposition bed 400 is mixed with the fresh desorption gas, which also regulates the temperature of the desorption gas flow entering the adsorption bed 300.

[0057] This embodiment adopts a combined process of gas pretreatment, activated carbon adsorption concentration, and catalytic decomposition. The entire system realizes a closed loop of purification and desorption processes. Compared with organic waste gas purification devices that rely on recycling, it does not require additional energy sources such as steam or additional equipment such as cooling towers. The operation process does not generate secondary pollution, and the equipment investment and operating costs are low. The adsorbent can be regenerated and reused after saturation through hot air desorption, and the catalyst can be used for a long time through activation.

[0058] The entire process does not cause secondary pollution, and the catalytic decomposition purification rate is generally above 98%. In addition, the reaction temperature is low, and there is no NO. × generate.

[0059] In this embodiment, specially shaped honeycomb activated carbon 310 with high micropores and high specific surface area is selected as the adsorption material. Since its specific gravity is 8-10 times greater than that of strip-shaped activated carbon 310 fibers, the honeycomb activated carbon 310 has the characteristics of large adsorption capacity, low resistance, and fast adsorption and desorption speed, so as to reduce the system operating resistance and shorten the desorption time. Before regeneration, the adsorption of organic solvents can reach 25% of the total weight of activated carbon 310. It has the characteristics of long service life, low operating resistance of adsorption system, and high purification efficiency.

[0060] This embodiment also includes a fire sprinkler system, which is connected to both the catalytic decomposition bed 400 and the adsorption bed 300. Both the catalytic decomposition bed 400 and the adsorption bed 300 are equipped with thermocouples to monitor the temperature inside the catalytic decomposition bed 400 and the adsorption bed 300. If the temperature is too high and combustion may occur, the fire sprinkler system will be activated to spray water to cool down and extinguish the fire. When the temperature of the adsorption bed 300 reaches 130 degrees Celsius, the fire sprinkler system will be activated to spray water to cool down, effectively eliminating the risk of fire.

[0061] In some embodiments, flame arresters are installed before and after the adsorption bed 300, after the desorption fan 800, and before and after the catalytic decomposition bed 400 to prevent the high-temperature combustion flame from backflowing.

[0062] This embodiment also provides an operation method for an organic waste gas purification system, the specific method of which is as follows:

[0063] When the organic waste gas containing particulate matter from the production workshop enters the high-efficiency cyclone tower 600 through the main collection pipe, a high-speed cyclone is generated due to the special cyclone guiding structure inside the tower. The organic waste gas containing particulate matter comes into full contact with the spray water inside the tower for washing. The washed particulate matter is thrown against the wall of the cyclone tank by the centrifugal force generated during the cyclone, and finally washed away by the spray water and falls into the particulate matter recovery tank. When the organic waste gas containing particulate matter and water mist passes through the dehydration layer, it must come into contact with the multifaceted spheres. The multifaceted spheres have a large specific surface area and a hydrophilic surface, which causes the water mist components in the organic waste gas to adhere to their surface. After removing most of the particulate matter and water mist, the organic waste gas enters the dry filter 700 for further filtration of the particulate matter and water mist that the high-efficiency cyclone tower 600 could not handle, and then enters the adsorption bed 300 behind it.

[0064] The organic waste gas, after removing most of the water mist and particulate matter, is then passed into an adsorption bed 300 containing honeycomb activated carbon 310. The gas is fully in contact with the honeycomb activated carbon 310 and is purified by utilizing the strong adsorption properties of activated carbon 310 on organic matter. The treated gas can be discharged in compliance with emission standards and is discharged from the chimney 100.

[0065] When the activated carbon 310 in one of the adsorption beds 300 is saturated, the adsorption inlet valve 320 and adsorption outlet valve 330 of that adsorption bed 300 are closed, and the desorption inlet valve 340 and desorption outlet valve 350 are opened. Under the operation of the desorption fan 800, the high-temperature desorption gas flow enters the adsorption bed 300, and the activated carbon 310 releases the adsorbed volatile organic compounds to achieve desorption of the activated carbon 310. The high-concentration waste gas is preheated on the cold side of the heat exchanger 420 and then enters the catalytic decomposition bed 400. Under the action of the catalyst layer 410, flameless combustion occurs, and the gas is oxidized and decomposed into CO2 and H2O, releasing heat energy at the same time. Part of this heat is used to heat the desorbed high-concentration waste gas through the heat exchanger 420, and the other part is used to heat and catalyze the activated carbon 310 with the desorption gas flow.

[0066] During the desorption of activated carbon 310, the desorption temperature of activated carbon 310 and the catalytic oxidation temperature of catalytic decomposition bed 400 are controlled by temperature control valve 460, desorption fan 800, first release valve 470 and second release valve 480.

[0067] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An organic waste gas purification system, characterized in that: It includes: The desorption device comprises a cyclone mixing spray device, a dry filtration device, an adsorption device, and a chimney (100) connected in sequence via ductwork. The adsorption device includes an adsorption fan (200) and multiple adsorption beds (300) connected in parallel. The adsorption beds (300) are provided with activated carbon (310). The adsorption beds (300) have an adsorption inlet equipped with an adsorption inlet valve (320), an adsorption outlet equipped with an adsorption outlet valve (330), a desorption inlet equipped with a desorption inlet valve (340), and a desorption outlet equipped with a desorption outlet valve (350). The desorption device includes a catalytic decomposition bed (400) and a desorption unit. The blower (800) has a catalyst layer (410) and a heat exchanger (420) arranged sequentially inside the catalytic decomposition bed (400) along the gas flow direction. The hot side of the heat exchanger (420) is located inside the catalytic decomposition bed (400). The outlet of the catalytic decomposition bed (400) is connected to the inlet of a plurality of desorption inlet valves (340) through a desorption inlet pipe (430). The cold side inlet of the heat exchanger (420) is connected to the outlet of a plurality of desorption outlet valves (350) through a desorption outlet pipe (440), and the cold side outlet of the heat exchanger (420) is connected to the inlet of the catalytic decomposition bed (400). The catalytic decomposition bed (400) is provided with an electric heating layer (450) located on the air inlet side of the catalyst layer (410). A temperature control valve (460) is connected between the desorption outlet pipe (440) and the desorption inlet pipe (430). The desorption fan (800) is connected in series to the desorption inlet pipe (430), and the temperature control valve (460) is located at the outlet of the desorption fan (800). A temperature control pipe is provided between the desorption outlet pipe (440) and the desorption inlet pipe (430), and the temperature control pipe is equipped with the temperature control valve (460). The outlet of the catalytic decomposition bed (400) is connected to a first release valve (470) that communicates with the outside. The desorption outlet pipe (440) is connected to a second release valve (480) that communicates with the outside.

2. The organic waste gas purification system according to claim 1, characterized in that: The desorption inlet pipe (430) is connected to a cooling supply pipe (500), and a cooling supply fan (510) is installed on the cooling supply pipe (500).

3. The organic waste gas purification system according to claim 1, characterized in that: Thermocouples are installed in both the catalytic decomposition bed (400) and the adsorption bed (300), and a fire sprinkler system is also included, which is connected to the catalytic decomposition bed (400) and the adsorption bed (300).

4. The organic waste gas purification system according to claim 1, characterized in that: The cyclone hybrid spray device includes multiple high-efficiency cyclone towers (600), and the dry filtration device includes multiple dry filters (700). The high-efficiency cyclone towers (600) and the dry filters (700) are connected one by one.

5. A method for operating an organic waste gas purification system, characterized in that: It employs the organic waste gas purification system as described in claim 2, and the specific method is as follows: First, the exhaust gas enters the cyclone mixing spray device to remove particulate matter and water mist; Then, it enters the dry filtration unit to further remove particulate matter and water mist; The waste gas is then passed into the adsorption bed (300), where activated carbon (310) adsorbs the organic waste gas to purify the gas. Finally, the purified gas that meets the standards is discharged out through the chimney (100); When the activated carbon in one of the adsorption beds (300) is saturated, the adsorption inlet valve (320) and adsorption outlet valve (330) of that adsorption bed (300) are closed, and the desorption inlet valve (340) and desorption outlet valve (350) are opened. Under the operation of the desorption fan (800), the high-temperature desorption gas flow enters the adsorption bed (300), and the activated carbon (310) releases the adsorbed volatile organic compounds to achieve desorption of the activated carbon (310). The high-concentration waste gas is preheated on the cold side of the heat exchanger (420) and then enters the catalytic decomposition bed (400). Under the action of the catalyst layer (410), flameless combustion occurs, and the gas is oxidized and decomposed into... and At the same time, a large amount of heat is released. Part of this heat is used to heat the high-concentration waste gas desorbed through the heat exchanger (420), and the other part is used to heat and catalyze the activated carbon (310) along with the desorbed gas flow. During the desorption of activated carbon (310), the desorption temperature of activated carbon (310) and the catalytic oxidation temperature of catalytic decomposition bed (400) are controlled by temperature control valve (460), desorption fan (800), first release valve (470) and second release valve (480).

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