Organic waste gas treatment device

Abstract

The application discloses a kind of organic waste gas treatment device, including primary processing device, spray tower, UV curing furnace, multistage filter, adsorption cylinder and regenerative thermal incinerator, the primary processing device is used to receive the paint mist generated by paint spraying machine, and paint mist is preliminarily processed;The spray tower further processes paint residue and paint mist in waste gas;The UV curing furnace is cured to paint mist in waste gas;The multistage filter is used to intercept and absorb paint mist particles;The adsorption cylinder is used to absorb volatile organic substances in waste gas, and the purified gas is discharged to chimney;The regenerative thermal incinerator is used to process waste gas after desorption of adsorption cylinder, and the treated gas is discharged to chimney.The waste gas treatment efficiency of the application is high and the treatment effect is good, suitable for paint mist recovery treatment in various paint spraying processes.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment technology, and specifically to an organic waste gas treatment device. Background Technology

[0002] Spray painting machines are important equipment in the comprehensive painting process of wood products. Generally, the following two types of pollutants are generated during the painting process:

[0003] Paint mist—When paint is under high pressure, it releases trace particles, which are dispersed by the airflow to form paint mist.

[0004] Organic waste gas—organic solvents are used to dilute paint to achieve a smooth and aesthetically pleasing surface. However, organic solvents do not adhere to the painted surface with the paint. During the painting process, all organic solvents are released, forming organic waste gas (mainly composed of VOCs). Organic waste gas is an irritating, colorless gas that, when released into the atmosphere, can cause significant harm to people through respiration or direct exposure, and also severely impacts the surrounding environment. Existing adsorption devices are inefficient at treating organic waste gas. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of not being able to completely remove pollutants generated during the painting process and not being able to efficiently treat organic waste gas, the present invention provides an organic waste gas treatment device to overcome the above-mentioned shortcomings.

[0006] An organic waste gas treatment device, comprising

[0007] A primary processing device is used to receive paint mist generated by the spray painting machine and to perform preliminary treatment on the paint mist.

[0008] The spray tower further treats the paint residue and paint mist in the exhaust gas;

[0009] A UV curing oven is used to cure paint mist in exhaust gas.

[0010] A multi-stage filter, wherein the multi-stage filter is used to intercept and absorb paint mist particles;

[0011] An adsorption cylinder is used to absorb organic matter in waste gas and discharge the purified gas through a chimney.

[0012] A regenerative thermal incinerator is used to treat the waste gas after desorption by the adsorption cylinder and to discharge the treated gas through a chimney.

[0013] As a preferred embodiment, the primary treatment device includes a housing, the interior of which is provided with a baffle isolation net and a sponge filter net from bottom to top, the air inlet of the housing is located below the baffle isolation net, and the air outlet of the housing is located above the sponge filter net;

[0014] A recycling box is provided at the bottom of the box, and the recycling box is placed below the baffle isolation net.

[0015] As a preferred embodiment, the air inlet of the spray tower is connected to the air outlet pipe of the box body, and the spray tower is equipped with a packing absorption module, with the air inlet of the spray tower located at the lower end of the packing absorption module.

[0016] A spray gun is installed above the packing absorption module, and an absorbent tank is installed on the bottom side of the spray tower. A pump body is installed on the absorbent tank to transport the absorbent to the spray gun.

[0017] As a preferred embodiment, the air outlet of the spray tower is connected to the air inlet of the UV curing oven, and the air outlet of the UV curing oven is connected to the air inlet of the multi-stage filter.

[0018] As a preferred embodiment, the multi-stage filter is provided with a glass fiber pre-filter, an F5 grade filter bag medium-efficiency filter, and an F9 grade filter bag high-efficiency filter arranged sequentially along the air inlet to outlet direction.

[0019] As a preferred embodiment, the adsorption cylinder is provided with a honeycomb zeolite molecular sieve rotating cylinder, which includes an adsorption zone and a desorption zone.

[0020] The air inlet of the adsorption cylinder is positioned toward the adsorption zone of the honeycomb zeolite molecular sieve rotating cylinder, and an air outlet channel is formed in the middle of the honeycomb zeolite molecular sieve rotating cylinder, which is connected to the chimney.

[0021] A first fan is installed between the multi-stage filter and the adsorption cartridge.

[0022] As a preferred embodiment, the system also includes a second fan, a heat exchanger, and a heater. The second fan is used to transport a portion of the gas discharged from the air outlet channel in the middle of the honeycomb zeolite molecular sieve rotating cylinder to the cold pipe of the heat exchanger for heat exchange and temperature increase. The gas is then further heated by the heater and blown into the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder through the air outlet channel.

[0023] As a preferred embodiment, the adsorption cylinder is further provided with a desorption gas outlet, which is provided in accordance with the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder. The desorption gas outlet is connected to the air inlet of the regenerative thermal incinerator, and the air outlet of the regenerative thermal incinerator is connected to the chimney.

[0024] As a preferred embodiment, the regenerative thermal incinerator is equipped with a bypass valve, which is connected to the heat pipes of the heat exchanger, and the outlet of the heat pipes of the heat exchanger is connected to the chimney; the heat pipes and cold pipes in the heat exchanger achieve heat exchange.

[0025] Beneficial effects: This invention utilizes a primary treatment device to recycle paint, avoiding energy waste. The spray tower removes organic components from the waste gas through spraying, while the UV curing oven solidifies and separates the paint molecules from the waste gas. Further, a multi-stage filter, adsorption cylinder, and regenerative thermal oxidizer intercept and absorb the mist particles, achieving the goal of purifying paint mist. Simultaneously, a zeolite adsorption concentration + RTO incineration combined process is employed, realizing a closed-loop cycle for the purification and desorption process. Compared with recycling-type organic waste gas purification devices, it requires no additional energy sources such as steam or cooling towers, does not generate secondary pollution during operation, and the adsorbent can be regenerated and reused after saturation through hot air desorption. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] In the diagram: 1-Painting machine; 2-Primary treatment device; 3-Spray tower; 4-UV curing oven; 5-Multi-stage filter; 6-First fan; 7-Adsorption cylinder; 8-Second fan; 9-Heat exchanger; 10-Heater; 11-Regenerative thermal incinerator; 12-Chimney; 201-Baffle isolation net; 202-Sponge filter; 203-Recovery box; 301-Catching absorption module; 302-Spray gun; 303-Absorbent tank; 501-Glass wool primary filter; 502-F5 grade filter bag medium-efficiency filter; 503-F9 grade filter bag high-efficiency filter; 701-Honeycomb zeolite molecular sieve rotating cylinder. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0029] In this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "between," "air inlet," and "air outlet," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 limitations on the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] like Figure 1 As shown, the present invention provides an organic waste gas treatment device, including a primary treatment device 2, a spray tower 3, a UV curing oven 4, a multi-stage filter 5, an adsorption cylinder 7, and a regenerative thermal incinerator 11. The primary treatment device 2 receives paint mist generated by a paint sprayer 1 and performs preliminary treatment on the paint mist. The spray tower 3 further treats paint residue and paint mist in the waste gas. The UV curing oven 4 cures the paint mist in the waste gas. The multi-stage filter 5 intercepts and absorbs paint mist particles. The adsorption cylinder 7 absorbs organic matter in the waste gas and discharges the purified gas through a chimney. The regenerative thermal incinerator 11 treats the waste gas desorbed by the adsorption cylinder 7 and discharges the treated gas through a chimney. This invention utilizes a primary treatment device 2 to recycle paint, avoiding energy waste. A spray tower 3 removes organic components from the waste gas using a spraying method. A UV curing oven 4 solidifies and separates the paint molecules in the waste gas. Then, a multi-stage filter 5, an adsorption cylinder 7, and a regenerative thermal oxidizer 11 further intercept and absorb the mist particles, thereby achieving the purpose of purifying paint mist. At the same time, a combination process of zeolite adsorption concentration and RTO incineration is adopted. 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 adsorbent can be regenerated and reused after saturation by hot air desorption.

[0031] In some examples of the present invention, the primary processing device 2 includes a housing. Inside the housing, from bottom to top, are arranged a baffle mesh 201 and a sponge filter 202. The air inlet of the housing is located below the baffle mesh 201, and the air outlet is located above the sponge filter 202. A recycling box 203 is located at the bottom of the housing, below the baffle mesh 201. Using this design, when paint mist enters the housing through the air inlet, the baffle mesh 201 filters both solid and liquid paint mist, while the gaseous paint mist is initially filtered by the sponge filter 202. The filtered paint mist then flows into the recycling box 203 for recycling, saving energy and reducing costs.

[0032] In some examples of the present invention, the air inlet of the spray tower 3 is connected to the air outlet pipe of the housing. The spray tower 3 is equipped with a packing absorption module 301, and the air inlet of the spray tower 3 is located at the lower end of the packing absorption module 301. A spray gun 302 is arranged above the packing absorption module 301, and an absorbent tank 303 is arranged on the bottom side of the spray tower 3. A pump body is arranged on the absorbent tank 303 to transport the absorbent to the spray gun 302. The air outlet of the spray tower 3 is connected to the air inlet of the UV curing oven 4, and the air outlet of the UV curing oven 4 is connected to the air inlet of the multi-stage filter 5. A water curtain is used to wash the paint residue and paint mist in the exhaust gas to the bottom of the tower for discharge. Volatile organic compounds insoluble in water are discharged to the subsequent multi-stage filter 5 by a fan. The spraying method can remove more than 85% of the paint residue and paint mist components in the exhaust gas. Organic waste gas is introduced into the spray tower, where water forms a liquid film on the surface of the packing absorption module 301. The gas-liquid two-phase flow pattern inside the tower is usually countercurrent. The absorbent is added from the top of the tower and flows from top to bottom, contacting the gas flowing from bottom to top. Taking advantage of the large specific surface area of ​​the packing, the liquid film and gas are in more complete contact, which improves the absorption efficiency. The liquid that has absorbed the absorbent is discharged from the bottom of the tower, and the purified gas is discharged from the top of the tower, thereby separating paint residue and paint mist from the waste gas.

[0033] In some examples of this invention, the multi-stage filter 5 is internally arranged with a glass fiber pre-filter 501, an F5-grade medium-efficiency filter bag 502, and an F9-grade high-efficiency filter bag 503 sequentially along the air inlet to outlet direction. The dry filter uses a dedicated dry paint mist filtration material as its core component. Waste gas that was not properly treated in the preceding process passes through multiple layers of progressively denser flame-retardant glass fiber material. Paint mist particles are intercepted, collided with, and absorbed, accumulating within the material's surface area, thus achieving the purpose of purifying the paint mist. When the organic waste gas containing paint mist from the production workshop passes through the high-efficiency water curtain cabinet, approximately 85% of the paint residue and paint mist are washed and settled into the collection tank. Waste gas containing some paint residue, paint mist, and moisture enters the glass fiber pre-filter through the collection pipe. The paint mist and moisture are filtered by the stacked glass fiber, which agglomerates on the surface and inside the glass fiber. Waste gas with most of the paint residue and moisture removed then passes through the filter layer into the subsequent filters. When the gas enters the F5-grade bag filter, fine dust and other particles that were not handled in the previous process are filtered out by the non-woven F5-grade filter bag (95%), while the relatively clean exhaust gas passes through subsequent filters. The F9-grade filter bag filters out the very little dust that may have been caused by breakage or leakage of the filter media in the previous process (99%). The F9-grade filter bag ultimately and effectively protects the subsequent molecular sieve adsorbent from contamination by impurities.

[0034] In some examples of the present invention, the adsorption cylinder 7 is provided with a honeycomb zeolite molecular sieve rotating cylinder 701, which includes an adsorption zone and a desorption zone. The air inlet of the adsorption cylinder 7 is positioned towards the adsorption zone of the honeycomb zeolite molecular sieve rotating cylinder 701, and an air outlet channel is formed in the middle of the honeycomb zeolite molecular sieve rotating cylinder 701, which is connected to a chimney. A first fan 6 is provided between the multi-stage filter 5 and the adsorption cylinder 7. The adsorption cylinder 7 has an adsorption zone and a desorption zone. When a portion of the honeycomb zeolite molecular sieve 701 becomes saturated in the adsorption zone, this portion of the honeycomb zeolite molecular sieve 701 is rotated and slowly enters the desorption zone. After the desorbed honeycomb zeolite molecular sieve 701 cools naturally, it returns to the adsorption zone with rotation to continue adsorption.

[0035] In some examples of the present invention, the organic waste gas treatment device further includes a second fan 8, a heat exchanger 9, and a heater 10. The second fan 8 is used to transport part of the gas discharged from the air outlet channel in the middle of the honeycomb zeolite molecular sieve rotating cylinder 701 to the cold pipe of the heat exchanger 9 for heat exchange and heating. The gas is then further heated by the heater 10 and blown into the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder 701 through the air outlet channel. The adsorption cylinder 7 is also provided with a desorption gas outlet. The desorbed gas outlet is configured to correspond to the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder 701. The desorbed gas outlet is connected to the air inlet of the regenerative thermal incinerator 11, and the air outlet of the regenerative thermal incinerator 11 is connected to the chimney. A bypass valve is provided on the regenerative thermal incinerator 11, and the bypass valve is connected to the heat pipe of the heat exchanger 9. The air outlet of the heat pipe of the heat exchanger 9 is connected to the chimney. The heat pipe and cold pipe in the heat exchanger 9 achieve heat exchange.

[0036] The organic waste gas, after most of the moisture and paint residue (paint mist) have been removed, is then passed into the adsorption cylinder 7, where it comes into full contact with the honeycomb zeolite molecular sieve rotating cylinder 701. The strong adsorption capacity of the molecular sieve for organic matter is utilized to purify the gas, ensuring it meets emission standards. Once the molecular sieve is saturated, it slowly enters the desorption zone as it rotates. Inside the desorption zone, the honeycomb zeolite molecular sieve rotating cylinder 701 is rapidly heated to 180℃-210℃ by hot air, blowing the adsorbed volatile organic compounds away from the molecular sieve and sending them with the hot air to a regenerative thermal oxidizer (RTO) for combustion. After desorption, the molecular sieve cools naturally and returns to the adsorption zone as it rotates to continue adsorption. This cycle continues.

[0037] Utilizing the adsorption properties of the microporous structure of molecular sieves to adsorb organic waste gas is one of the most effective industrial treatment methods. Modified molecular sieves, after activation treatment, typically achieve a specific surface area of ​​600-700 m². 2 / g, possessing excellent and broad adsorption capacity. Adsorption can achieve a purification efficiency of up to 90-95% for organic waste gas. The modified molecular sieve is also a non-polar adsorbent, exhibiting hydrophobic and organic-loving properties. It can adsorb specific organic gases, such as benzenes, aldehydes, ketones, alcohols, hydrocarbons, and malodorous substances. After the molecular sieve becomes saturated, it can be regenerated by hot air desorption, allowing it to be reused. The zeolite rotary adsorption equipment is equipped with a rotation drive mechanism; by adjusting the rotation speed of the drive, the adsorption concentration factor of the waste gas can be effectively increased by 10-40 times.

[0038] The waste gas desorbed from the desorption zone is fed into the regenerator chamber of a regenerative thermal oxidizer (RTO). As the waste gas rises, it is heated by the preheated regenerator. During this ascent, organic molecules begin to undergo oxidation. The gas finally enters the combustion chamber, where it is completely decomposed into carbon dioxide (CO2) and water (H2O) at high temperatures, generating a large amount of heat. This hot gas then enters the regenerator chamber to heat the regenerator. The final treated gas is then discharged from the RTO outlet through the chimney. The regenerator in the regenerator chamber absorbs heat and is used to heat newly input low-temperature waste gas in the next cycle.

[0039] This invention provides a VOC waste gas treatment device that can operate continuously and reliably for a long time without affecting production and ensuring the health and hygiene needs of operators. After paint mist is collected, most of the paint mist is treated through recycling, light curing, high-efficiency spraying, and filtration pretreatment. Finally, a combination of zeolite adsorption concentration and RTO incineration is used. The entire system achieves a closed-loop cycle of purification and desorption processes. Compared with recycling-type organic waste gas purification devices, it does not require additional energy sources such as steam or additional equipment such as cooling towers. It does not generate secondary pollution during operation, and the adsorbent can be regenerated and reused after saturation through hot air desorption.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An organic waste gas treatment device, characterized in that, include A primary processing device is used to receive paint mist generated by the spray painting machine and to perform preliminary treatment on the paint mist. The spray tower further treats the paint residue and paint mist in the exhaust gas; A UV curing oven is used to cure paint mist in exhaust gas. A multi-stage filter, wherein the multi-stage filter is used to intercept and absorb paint mist particles; An adsorption cylinder is used to absorb organic matter in waste gas and discharge the purified gas through a chimney. A regenerative thermal incinerator is used to treat the waste gas after desorption by the adsorption cylinder and to discharge the treated gas through a chimney. The air outlet of the spray tower is connected to the air inlet of the UV curing oven, and the air outlet of the UV curing oven is connected to the air inlet of the multi-stage filter. The adsorption cylinder is equipped with a honeycomb zeolite molecular sieve rotating cylinder, which includes an adsorption zone and a desorption zone. The air inlet of the adsorption cylinder is positioned toward the adsorption zone of the honeycomb zeolite molecular sieve rotating cylinder, and an air outlet channel is formed in the middle of the honeycomb zeolite molecular sieve rotating cylinder, which is connected to the chimney. A first fan is provided between the multi-stage filter and the adsorption cartridge; It also includes a second fan, a heat exchanger and a heater. The second fan is used to transport part of the gas discharged from the air outlet channel in the middle of the honeycomb zeolite molecular sieve rotating cylinder to the cold pipe of the heat exchanger for heat exchange and temperature increase. The gas is then further heated by the heater and blown into the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder through the air outlet channel. The adsorption cylinder is also provided with a desorption gas outlet, which is set in the desorption zone of the honeycomb zeolite molecular sieve rotating cylinder. The desorption gas outlet is connected to the air inlet of the regenerative thermal incinerator, and the air outlet of the regenerative thermal incinerator is connected to the chimney.

2. The organic waste gas treatment device according to claim 1, characterized in that, The primary processing device includes a box, inside which a baffle isolation net and a sponge filter net are arranged sequentially from bottom to top. The air inlet of the box is located below the baffle isolation net, and the air outlet of the box is located above the sponge filter net. A recycling box is provided at the bottom of the box, and the recycling box is placed below the baffle isolation net.

3. The organic waste gas treatment device according to claim 2, characterized in that, The air inlet of the spray tower is connected to the air outlet pipe of the box body. The spray tower is equipped with a packing absorption module, and the air inlet of the spray tower is located at the lower end of the packing absorption module. A spray gun is installed above the packing absorption module, and an absorbent tank is installed on the bottom side of the spray tower. A pump body is installed on the absorbent tank to transport the absorbent to the spray gun.

4. The organic waste gas treatment device according to claim 1, characterized in that, The multi-stage filter contains, in sequence, a glass fiber pre-filter, an F5 grade medium-efficiency filter bag, and an F9 grade high-efficiency filter bag along the air inlet to outlet direction.

5. The organic waste gas treatment device according to claim 1, characterized in that, The regenerative thermal incinerator is equipped with a bypass valve, which is connected to the heat pipes of the heat exchanger. The outlet of the heat pipes of the heat exchanger is connected to the chimney. The heat pipes and cold pipes in the heat exchanger exchange heat.

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