Waste gas treatment system

Abstract

The utility model discloses a waste gas treatment system which comprises an adsorption system, a vacuum system, an advanced treatment system and an ozone generator, and the adsorption system comprises an adsorption fan, a plurality of adsorbers, a plurality of air pipes and a plurality of air pipe valves; the vacuum system comprises a vacuum pump, a plurality of pipelines and a plurality of pipeline valves; the deep treatment system is an oxidation tank; the ozone generator is communicated with the adsorber and the oxidation tank; the fan is communicated with the adsorber, and the adsorber is communicated with the oxidation tank; the method has the advantages of high efficiency and low cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas treatment, in particular to a waste gas treatment system. Background Art

[0002] From the source of waste gas, there are two different types of waste gas emissions: organized high-concentration waste gas and unorganized low-concentration waste gas. The main difference between them lies in the source of emissions and management methods: (1) Organized high-concentration waste gas comes from clearly located emission sources, usually industrial, commercial or other types of production and processing equipment, and is generally easy to collect and treat in a centralized manner. (2) Unorganized low-concentration waste gas comes from dispersed, unclear or non-specific sources, usually emissions scattered in the natural environment, and contains lower concentrations of volatile organic compounds and other harmful gases than organized high-concentration waste gas.

[0003] At present, there are many processes used in the field of organic waste gas treatment. For low-concentration waste gas with complex components, under continuous emission conditions, zeolite wheel adsorption + regenerative combustion process is usually used; under discontinuous conditions, activated carbon adsorption + catalytic combustion desorption process is usually used. The traditional desorption process will cause a lot of heat loss, resulting in serious waste of resources and increasing the operating cost of waste gas treatment.

[0004] Application number CN202210473719.1, a photocatalytic oxidation waste gas treatment device and its control method. The organic gas adsorbed by the adsorbent is desorbed by ozone and enters the photocatalytic oxidation waste gas treatment. Since most of the empty channels of the adsorbent saturated with adsorption are occupied by organic matter, the ozone introduced cannot be adsorbed by the adsorbent, resulting in incomplete desorption, which affects the re-adsorption of the adsorbent. However, the photocatalytic oxidation treatment of the desorbed exhaust gas has low treatment efficiency and the titanium dioxide catalyst is prone to failure, resulting in the instability of the equipment.

[0005] Therefore, it will be very meaningful to develop a more efficient treatment process with lower investment and operating costs for low-concentration organic waste gas conditions. Utility Model Content

[0006] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] In order to overcome the deficiencies of the prior art, the utility model provides an exhaust gas treatment system.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a waste gas treatment system, including an adsorption system, a vacuum system, a deep treatment system and an ozone generator, the adsorption system includes an adsorption fan, a plurality of adsorbers, a plurality of air ducts and a plurality of air duct valves; the vacuum system includes a vacuum pump, a plurality of pipelines and a plurality of pipeline valves; the deep treatment system is an oxidation tank; the ozone generator is connected with the adsorber and the oxidation tank; the fan is connected with the adsorber, and the adsorber is connected with the oxidation tank.

[0009] Furthermore, the adsorber is filled with an adsorbent.

[0010] Furthermore, the adsorbent is one or more combinations of adsorption materials such as activated carbon, zeolite molecular sieve, macroporous adsorption resin, activated alumina, silica gel, etc.

[0011] Furthermore, the number of the adsorbers is 2.

[0012] Furthermore, the number of the adsorbers is 3.

[0013] Furthermore, the oxidation tank is a fixed bed oxidation tank, and an ozone catalyst is arranged in the oxidation tank.

[0014] Furthermore, the oxidation tank is a spray tower oxidation tank, a nozzle and an ultraviolet lamp are arranged inside the oxidation tank, a spray circulation pump and a pipeline are arranged outside the oxidation tank, and the circulating water used in the oxidation tank contains hydrogen peroxide and a catalyst or alkali.

[0015] Furthermore, the oxidation tank is a high-temperature oxidation tank, and an electromagnetic heater is installed outside the oxidation tank.

[0016] Furthermore, the vacuum pump is a dry vacuum pump.

[0017] The utility model is beneficial in that it provides an efficient and low-cost exhaust gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0019] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0020] In the attached picture:

[0021] Figure 1 It is a schematic diagram of the primary desorption of an exhaust gas treatment system of the utility model.

[0022] Figure 2It is a schematic diagram of the secondary desorption of an exhaust gas treatment system of the utility model. DETAILED DESCRIPTION

[0023] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0024] It should also be noted that, for ease of description, only the parts related to the relevant utility model are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0025] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0026] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0027] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0028] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] A waste gas treatment system comprises an adsorption system, a vacuum system, a deep treatment system and an ozone generator.

[0030] The adsorption system includes an adsorption fan, several adsorbers, several air ducts and several air duct valves; the adsorption fan provides power for the exhaust gas, and sends the exhaust gas into the adsorber for treatment and then discharge; the adsorber is filled with an adsorbent, which is a substance suitable for adsorbing various components in the exhaust gas, and can be one or more combinations of adsorption materials such as activated carbon, zeolite molecular sieve, macroporous adsorption resin, activated alumina, silica gel, etc.; the air duct is used to connect the fan and the adsorber, and the air duct valve controls the on-off of the air duct; the adsorption system can be set to primary adsorption or secondary adsorption according to needs, that is, the number of adsorbers can be set to 2 or 3.

[0031] The vacuum system includes a vacuum pump, a plurality of pipelines and a plurality of pipeline valves, and the vacuum pump is a dry vacuum pump.

[0032] According to the composition of the exhaust gas, the deep treatment system can be: a. a fixed bed oxidation tank, which is equipped with an ozone catalyst inside to catalyze ozone to completely oxidize the harmful components; b. a spray tower oxidation tank, which is equipped with a nozzle and an ultraviolet lamp inside the tank, and a circulating pump and pipeline for spraying outside the tank. The circulating water contains hydrogen peroxide and a catalyst or alkali, which cooperate with ozone to produce free radicals to oxidize harmful substances. The generated acidic inorganic oxides can be absorbed by the alkaline circulating water; c. a high-temperature oxidation tank, which is equipped with an electromagnetic heater outside the tank to quickly oxidize the harmful components.

[0033] The ozone generator provides ozone for the adsorbent desorption and deep oxidation systems.

[0034] The present application also discloses a desorption process, which comprises the following steps:

[0035] 1) Evacuate the saturated adsorber and maintain the absolute pressure in the adsorber within 1000 Pa for 10 to 300 minutes;

[0036] 2) Then, ozone is introduced to deeply desorb the adsorbent for 10 to 300 minutes;

[0037] 3) Then, the adsorber is evacuated again to maintain the absolute pressure in the adsorber within 1000 Pa for 10 to 300 minutes;

[0038] 4) Then wait for the next adsorption.

[0039] 5) The high-concentration waste gas extracted by the vacuum pump is sent to the advanced oxidation tank for deep oxidation treatment.

[0040] 6) The treated waste gas returns to the adsorber and is adsorbed and treated again before being discharged.

[0041] To ensure that emissions meet standards.

[0042] Specifically, Figure 1 As shown, the desorption process implementation steps in the primary adsorption system are as follows:

[0043] 1) After the adsorbent in adsorber A is saturated, close valves A1, A4, A5, B5, and B6, open valves A6, B1, B4, H1, H2, and H3, start the ozone generator G to send ozone into the oxidation tank H, start the vacuum pump P to desorb the organic matter in adsorber A, and send it into the oxidation tank H for oxidation treatment;

[0044] 2) A small amount of untreated organic matter and unconsumed ozone are sent to adsorber B by adsorption fan F to be adsorbed;

[0045] 3) Maintain the absolute pressure in adsorber A within 1000 Pa for 10 to 300 min, close valve A6, and stop vacuum pump P;

[0046] 4) Close valve H1 and slowly open valve A5, and ozone enters adsorber A to continue desorption;

[0047] 5) When the pressure in adsorber A reaches normal pressure, close valve A5, open valves A6 and H1, and start vacuum pump P for secondary desorption;

[0048] 6) Maintain the absolute pressure in adsorber A within 1000Pa for 10 to 300 minutes, and close the valve

[0049] Door A6, stop vacuum pump P and ozone generator G, adsorber A waits for next adsorption. The above steps are automatically controlled by PLC control system.

[0050] like Figure 2 As shown, the desorption process implementation steps in the secondary adsorption system are as follows:

[0051] 1) Open valves A1, A2, B3, and B4, and close valves A3, A4, A5, A6, B1, B2, B5, and B6. The exhaust gas passes through the adsorption fan F and enters adsorber A and adsorber B. It is purified by the adsorbent at the second level and then discharged;

[0052] 2) After the adsorbent in adsorber A is saturated, valves B1, B2, C3, and C4 are opened, and valves A1, A2, B3, B4, C1, C2, C5, and C6 are closed, and the exhaust gas enters adsorbers B and C;

[0053] 3) Open valves A6, H1, H2, and H3, start the ozone generator G to send ozone into the oxidation tank H, start the vacuum pump P to desorb the organic matter in the adsorber A, and send it into the oxidation tank H for oxidation treatment;

[0054] 4) A small amount of untreated organic matter and unconsumed ozone are sent to adsorbers B and C by adsorption fan F for adsorption;

[0055] 5) Maintain the absolute pressure in adsorber A within 1000 Pa for 10 to 300 min, close valve A6, and stop vacuum pump P;

[0056] 6) Close valve H1 and slowly open valve A5, and ozone enters the adsorbent in adsorber A to continue desorption treatment;

[0057] 7) When the pressure in adsorber A reaches normal pressure, close valve A5, open valve A6 and start vacuum pump P to perform secondary desorption;

[0058] 8) Maintain the absolute pressure in adsorber A within 1000Pa for 10 to 300 minutes, close valve A6, stop vacuum pump P and ozone generator G, and adsorber A waits for the next adsorption;

[0059] 9) After the adsorbent in adsorber B is saturated, valves C1, C2, A3, and A4 are opened, and valves B1, B2, C3, C4, A1, A2, A5, and A6 are closed, and the exhaust gas enters adsorber C, adsorber A, and adsorber B repeats the above desorption procedure;

[0060] 10) After the adsorbent in adsorber C is saturated, valves A1, A2, B3, and B4 are opened, and valves C1, C2, A3, A4, B1, B2, B5, and B6 are closed, and the exhaust gas enters adsorber A, adsorber B, and adsorber C repeats the above desorption procedure;

[0061] 11) The above steps are automatically controlled by the PLC control system, and the three adsorbers perform adsorption and desorption alternately and operate continuously.

[0062] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned utility model concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) to form a technical solution.

Claims

1. An exhaust gas treatment system, characterized in that: It includes an adsorption system, a vacuum system, a deep treatment system and an ozone generator. The adsorption system includes an adsorption fan, a plurality of adsorbers, a plurality of air ducts and a plurality of air duct valves; the vacuum system includes a vacuum pump, a plurality of pipelines and a plurality of pipeline valves; the deep treatment system is an oxidation tank; the ozone generator is connected with the adsorber and the oxidation tank; the fan is connected with the adsorber, and the adsorber is connected with the oxidation tank.

2. The exhaust gas treatment system according to claim 1, characterized in that: The adsorber is filled with an adsorbent.

3. The exhaust gas treatment system according to claim 2, characterized in that: The adsorbent is one or more combinations of activated carbon, zeolite molecular sieve, macroporous adsorption resin, activated alumina, and silica gel adsorption material.

4. The exhaust gas treatment system according to claim 1, characterized in that: The number of the adsorbers is 2.

5. The exhaust gas treatment system according to claim 1, characterized in that: The number of the adsorbers is 3.

6. The exhaust gas treatment system according to claim 1, characterized in that: The oxidation tank is a fixed bed oxidation tank, and an ozone catalyst is arranged in the oxidation tank.

7. The exhaust gas treatment system according to claim 1, characterized in that: The oxidation tank is a spray tower oxidation tank, a nozzle and an ultraviolet lamp are arranged inside the oxidation tank, a spray circulation pump and a pipeline are arranged outside the oxidation tank, and the circulating water used in the oxidation tank contains hydrogen peroxide and a catalyst or alkali.

8. The exhaust gas treatment system according to claim 1, characterized in that: The oxidation tank is a high-temperature oxidation tank, and an electromagnetic heater is installed outside the oxidation tank.

9. The exhaust gas treatment system according to claim 1, characterized in that: The vacuum pump is a dry vacuum pump.

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