Waste gas treatment system based on self-cooling internal circulation technology

Abstract

The utility model relates to a waste gas treatment system based on a self-cooling internal circulation technology, and relates to the technical field of waste gas treatment equipment.The waste gas treatment system comprises a gas mixing unit, the gas mixing unit is used for mixing treated low-temperature dry gas with production waste gas so as to achieve the purposes of cooling, dehumidification and peak clipping; the adsorption unit is used for adsorbing organic pollutants in the mixed gas in the gas mixing unit; the treatment unit is used for dehumidifying and purifying gas generated in the adsorption process of the adsorption and desorption unit; and the self-cooling internal circulation unit is used for removing moisture in the gas discharged by the treatment unit, reducing the humidity and temperature of the gas and conveying the gas to the gas mixing unit. The device has the advantages that the treatment effect and treatment efficiency of high-temperature and high-humidity waste gas and high-concentration pollutants are improved, and the service life of treatment equipment is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of waste gas treatment equipment, and in particular to a waste gas treatment system based on self-cooling internal circulation technology. Background Art

[0002] With the rapid development of industrialization, environmental pollution problems have also become prominent. Among them, the problem of excessive ozone in the atmospheric environment has become a technical problem that needs to be solved urgently. According to relevant reports, volatile organic compounds (VOCs) are important precursors for the formation of ozone, so VOCs need to be targeted for treatment.

[0003] Due to differences in raw materials, processes, product categories, and types, the VOCs emission characteristics of VOCs-related industries are also different. Among them, the VOCs waste gas emitted by some industries has the characteristics of high temperature, high humidity, and high concentration. It is difficult to effectively remove this type of waste gas using conventional, single waste gas treatment processes. Even if it can be effectively removed, it requires a long process combination, which also leads to increased investment and operating costs. Therefore, how to treat high-temperature, high-humidity, and high-concentration organic waste gas with the lowest investment cost has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide a waste gas treatment system based on self-cooling internal circulation technology, which can effectively treat high-temperature, high-humidity and high-concentration VOCs waste gas, improve treatment efficiency, extend equipment service life, and ensure that the waste gas meets emission standards after treatment.

[0005] The present application provides an exhaust gas treatment system based on self-cooling internal circulation technology, which adopts the following technical solution: an exhaust gas treatment system based on self-cooling internal circulation technology, comprising:

[0006] A gas mixing unit, which is used to mix low-temperature dry gas with production waste gas to achieve the purpose of cooling, dehumidification and peak shaving;

[0007] An adsorption unit, the adsorption unit being used for adsorbing organic pollutants in the mixed gas in the gas mixing unit;

[0008] A processing unit, the processing unit is used to dehumidify and purify the gas generated during the adsorption process of the adsorption unit;

[0009] A self-cooling internal circulation unit is used to remove moisture from the gas discharged from the processing unit, reduce the humidity and temperature of the gas, and transport the gas to the gas mixing unit.

[0010] Preferably, the gas mixing unit includes at least two mixing tanks, the two mixing tanks are connected in parallel, the inlets of the two mixing tanks are connected to the exhaust gas intake pipe and the self-cooling internal circulation unit through a pipeline, and the outlets of the two mixing tanks are connected to the adsorption unit through a pipeline. By setting up multiple mixing tanks, the mixing efficiency of the exhaust gas and the low-temperature dry gas can be improved, further ensuring the realization of the cooling, dehumidification and peak shaving effects.

[0011] Preferably, the adsorption unit comprises at least two adsorption tanks, the adsorption tanks are filled with adsorption fillers, the adsorption tank inlet is connected to the mixing tank outlet, and the adsorption tank outlet is connected to the processing unit. By providing multiple adsorption tanks, the loading capacity of the adsorption filler can be increased, the adsorption effect can be improved, and the replacement and maintenance of the adsorption filler can be facilitated.

[0012] Preferably, the adsorption unit further comprises a desorption system and a desorption gas treatment system, and the desorption system and the desorption gas treatment system are respectively connected to the adsorption tank through pipelines. By setting up the desorption system and the desorption gas treatment system, the adsorption filler can be recycled and the use efficiency and economy of the system can be improved.

[0013] Preferably, the desorption system adopts a steam desorption system or a nitrogen desorption system. These two desorption methods have the advantages of high desorption efficiency and simple operation, and can be flexibly selected according to actual conditions.

[0014] Preferably, the adsorption filler is at least one of activated carbon and zeolite molecular sieve. These adsorption fillers have the characteristics of strong adsorption performance and good durability, and can effectively remove organic pollutants in the mixed gas.

[0015] Preferably, the treatment unit comprises a spray tower, an activated carbon box and a centrifugal fan which are sequentially arranged in a pipeline, the spray tower inlet is connected to the adsorption tank outlet through a pipeline, and the centrifugal fan outlet is connected to a discharge pipeline. By using the spray tower and the activated carbon box in combination, the hydrophilic pollutants and organic pollutants in the exhaust gas can be further removed to ensure that the exhaust gas meets the discharge standards after treatment.

[0016] Preferably, the self-cooling internal circulation unit includes a circulation pipeline, the circulation pipeline is connected to the mixing tank inlet and the discharge pipeline, and a condenser, a surface cooler and a dehumidifier are sequentially arranged in the circulation pipeline. Through the joint action of the condenser, the surface cooler and the dehumidifier, the treated exhaust gas can be deeply cooled and dehumidified, providing more suitable low-temperature dry gas for subsequent mixing.

[0017] In summary, the present application includes at least one of the following beneficial technical effects:

[0018] 1. Since the utility model adopts a gas mixing unit to mix low-temperature dry gas with production waste gas, the purpose of cooling, dehumidification and peak cutting is achieved, thereby effectively avoiding the impact of high-temperature, high-humidity waste gas and high-concentration pollutants on subsequent processing equipment, and extending the service life of subsequent processing equipment.

[0019] 2. In the present invention, an adsorption unit is preferably used to adsorb organic pollutants in the mixed gas, and a treatment unit is used to dehumidify and purify the gas generated during the adsorption process, which further improves the treatment effect of the exhaust gas and ensures that the exhaust gas can meet the emission standards after treatment.

[0020] 3. In the utility model, the self-cooling internal circulation unit is provided to achieve deep cooling and dehumidification of the treated exhaust gas, which not only provides more suitable low-temperature dry gas for subsequent mixing, but also effectively reduces the energy consumption and operation cost of the system.

[0021] 4. The waste gas treatment system of the utility model has the advantages of compact structure, simple operation, stable and reliable treatment effect, etc. It can be widely used in industries with high temperature, high humidity and high concentration VOCs waste gas emissions such as chemical industry and coating, and has broad market prospects and promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a system schematic diagram of an exhaust gas treatment system based on self-cooling internal circulation technology in an embodiment of the present application.

[0023] Explanation of the reference numerals: 1. gas mixing unit; 11. mixing tank; 12. exhaust gas inlet pipe; 2. adsorption unit; 21. adsorption tank; 22. desorption system; 23. desorption gas treatment system; 3. treatment unit; 31. spray tower; 32. activated carbon box; 33. centrifugal fan; 34. discharge pipe; 4. self-cooling internal circulation unit; 41. dehumidifier; 42. surface cooler; 43. condenser; 44. circulation pipe. DETAILED DESCRIPTION

[0024] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0025] See also Figure 1. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions for the implementation of this application, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by this application, should still fall within the scope of the technical content disclosed in this application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this application. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this application without substantially changing the technical content.

[0026] The following is combined with Figure 1 This application is described in further detail.

[0027] Example 1

[0028] The exhaust gas treatment system provided in the embodiment of the present application is as follows: Figure 1 As shown, it includes a gas mixing unit 1, an adsorption unit 2, a processing unit 3 and a self-cooling internal circulation unit 4.

[0029] The gas mixing unit 1 is used to mix the low-temperature dry gas with the production waste gas to achieve the purpose of cooling, dehumidification and peak shaving. Specifically, the gas mixing unit 1 includes three parallel mixing tanks 11. The inlets of the three mixing tanks 11 are connected to the waste gas intake pipe 12 and the self-cooling internal circulation unit 4 through pipelines, so as to receive the production waste gas and the low-temperature dry gas at the same time. The outlets of the three mixing tanks 11 are connected to the adsorption unit 2 through pipelines to send the mixed gas to the next processing link.

[0030] The adsorption unit 2 is used to adsorb organic pollutants in the mixed gas in the gas mixing unit 1. In detail, the adsorption unit 2 includes two adsorption tanks 21, each of which is filled with an adsorption filler, such as activated carbon or zeolite molecular sieve. The inlets of these adsorption tanks 21 are connected to the outlet of the mixing tank 11, and their outlets are connected to the processing unit 3 so as to transfer the gas treated by adsorption to the next unit.

[0031] The processing unit 3 is responsible for further dehumidifying and purifying the gas generated during the adsorption process of the adsorption unit 2. Specifically, the processing unit 3 is composed of a spray tower 31, an activated carbon box 32 and a centrifugal fan 33, which are sequentially arranged in a pipeline. The inlet of the spray tower 31 is connected to the outlet of the adsorption tank 21, and a water spray device is provided inside the spray tower 31, which can remove hydrophilic pollutants in the gas and reduce the gas temperature. The gas after spraying treatment then enters the activated carbon box 32, in which the activated carbon can adsorb and remove the remaining organic pollutants. Finally, the purified gas is pressurized by the centrifugal fan 33 and discharged from the system through the exhaust pipe 34.

[0032] The function of the self-cooling internal circulation unit 4 is to remove moisture from the gas discharged from the processing unit 3, reduce the humidity and temperature of the gas, and circulate the treated gas back to the gas mixing unit 1. In order to achieve this goal, the self-cooling internal circulation unit 4 includes a circulation pipeline 44, which connects the inlet of the mixing tank 11 and the discharge pipeline 34. In the circulation pipeline 44, a condenser 43, a surface cooler 42 and a dehumidifier 41 are arranged in sequence. The condenser 43 and the surface cooler 42 reduce the temperature of the gas by circulating the coolant, and the dehumidifier 41 removes moisture from the gas, thereby ensuring that the gas circulated back to the mixing tank 11 has a suitable low-temperature dry state.

[0033] Example 2

[0034] On the basis of Example 1, the adsorption unit 2 further includes a desorption system 22 and a desorption gas treatment system 23. These two systems are connected to the adsorption tank 21 through a pipeline to achieve the regeneration and utilization of the adsorption filler. Specifically, when the adsorption filler reaches a saturated state, the desorption system 22 can be started, and steam or nitrogen is used as a desorption medium to desorb the organic pollutants adsorbed on the filler. The desorbed organic pollutants enter the desorption gas treatment system 23 with the desorption gas, where they are subjected to condensation, separation and other process treatments to ultimately achieve effective recovery and treatment of the organic pollutants. This configuration not only improves the utilization rate of the adsorption filler, but also reduces the operating cost of the system.

[0035] The implementation principle of this embodiment is: through the cooling, dehumidification and peak shaving treatment of the gas mixing unit, combined with the adsorption effect of the adsorption unit, the further purification of the treatment unit and the circulation cooling and dehumidification function of the self-cooling internal circulation unit, this system can effectively treat high-temperature, high-humidity and high-concentration VOCs waste gas. The treatment process not only improves the waste gas treatment efficiency, but also ensures that the treated waste gas can meet the emission standards, while extending the service life of the equipment and reducing the energy consumption and operating costs of the system.

[0036] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the present application shall still be included in the protection scope of the present application.

Claims

1. An exhaust gas treatment system based on self-cooling internal circulation technology, characterized in that: include: A gas mixing unit (1), the gas mixing unit (1) is used to mix dry gas with production waste gas to achieve the purpose of cooling, dehumidification and peak shaving; An adsorption unit (2), the adsorption unit (2) being used to adsorb organic pollutants in the mixed gas in the gas mixing unit (1); A processing unit (3), the processing unit (3) being used to dehumidify and purify the gas generated during the adsorption process of the adsorption unit (2); A self-cooling internal circulation unit (4), the self-cooling internal circulation unit (4) is used to remove moisture from the gas discharged from the processing unit (3), reduce the humidity and temperature of the gas, and transport the gas to the gas mixing unit (1).

2. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 1 is characterized in that: The gas mixing unit (1) comprises at least two mixing tanks (11), the two mixing tanks (11) are connected in parallel, the inlets of the two mixing tanks (11) are connected to the exhaust gas intake pipe (12) and the self-cooling internal circulation unit (4) through pipelines, and the outlets of the two mixing tanks (11) are connected to the adsorption unit (2) through pipelines.

3. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 2 is characterized in that: The adsorption unit (2) comprises at least two adsorption tanks (21), the interior of the adsorption tanks (21) being filled with adsorption fillers, the inlets of the adsorption tanks (21) being connected to the outlets of the mixing tanks (11), and the outlets of the adsorption tanks (21) being connected to the processing unit (3).

4. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 3 is characterized in that: The adsorption unit (2) further comprises a desorption system (22) and a desorption gas treatment system (23), wherein the desorption system (22) and the desorption gas treatment system (23) are respectively connected to the adsorption tank (21) via pipelines.

5. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 4 is characterized in that: The desorption system (22) adopts a steam desorption system or a nitrogen desorption system.

6. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 3 is characterized in that: The adsorption filler is at least one of activated carbon and zeolite molecular sieve.

7. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 3 is characterized in that: The treatment unit (3) comprises a spray tower (31), an activated carbon box (32) and a centrifugal fan (33) which are sequentially arranged in a pipeline, the inlet of the spray tower (31) is connected to the outlet of the adsorption tank (21) through a pipeline, and the outlet of the centrifugal fan (33) is connected to a discharge pipeline (34).

8. The exhaust gas treatment system based on the self-cooling internal circulation technology according to claim 7 is characterized in that: The self-cooling internal circulation unit (4) comprises a circulation pipeline (44), wherein the circulation pipeline (44) is connected to the inlet of the mixing tank (11) and the discharge pipeline (34), and a condenser (43), a surface cooler (42) and a dehumidifier (41) are sequentially arranged in the circulation pipeline (44).

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