CN214715478U - VOCs processing system - Google Patents
VOCs processing system Download PDFInfo
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- CN214715478U CN214715478U CN202120944084.XU CN202120944084U CN214715478U CN 214715478 U CN214715478 U CN 214715478U CN 202120944084 U CN202120944084 U CN 202120944084U CN 214715478 U CN214715478 U CN 214715478U
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Abstract
The application relates to the technical field of environmental protection, and specifically discloses a VOCs processing system. Along the airflow direction, the device comprises a regulating unit, a filtering unit, an adsorption and desorption unit, an incineration unit and a heat storage and cooling unit which are connected in sequence; the gas outlet end of the heat exchange unit is communicated with the adsorption and desorption unit; this application will adsorb desorption unit and flow direction heat transfer unit's waste gas proportion through the control flow direction, can adjust the concentration of waiting to burn high VOCs mixed waste gas to the best condition of burning to can improve combustion efficiency, improve VOCs's clearance, improve the operating efficiency of system.
Description
Technical Field
The application relates to the technical field of environmental protection, more specifically, it relates to a VOCs processing system.
Background
Volatile organic compounds, commonly denoted as VOCs, areVolatile Organic CompoundsThe VOCs refers to non-methane organic compounds with higher vapor pressure and easy volatility at normal temperature and pressure. VOCs are the formation of fine particulate matter (PM2.5), ozone (O)3) And the important precursors of secondary pollutants, and further causes atmospheric environmental problems such as dust haze, photochemical smog and the like. To fundamentally solve PM2.5, O3And the pollution problem is solved, the quality of the atmospheric environment is really improved, and the prevention and the treatment of the pollution of the precursor VOCs must be enhanced.
The industrial coating is an industrial VOCs (volatile organic compounds) discharge household, has the discharge characteristics of low concentration and large air volume, and compares representative discharge parameters: 100-300 mg/m of paint spray booth31000-2000 mg/m drying room3. Because the content of VOCs in the original waste gas in industrial coating is low and the direct combustion condition is not available, an adsorption concentration process is generally adopted before incineration to separate and concentrate VOCs in low-concentration large-air-volume industrial waste gas, and then the concentrated VOCs in high-concentration small-air-volume waste gas are destroyed by a combustion method. At present, the most common treatment method is to form a treatment process of 'heating and temperature adjustment, molecular sieve rotating wheel and combustion'. However, the inventor finds that the process cannot regulate the concentration of the exhaust gas entering the combustion process, thereby affecting the combustion efficiency and the efficiency of the system for treating the exhaust gas.
Disclosure of Invention
In order to regulate and control the concentration of waiting to burn waste gas, improve combustion efficiency and the efficiency that the system handled waste gas, the application provides a VOCs processing system.
The application provides a VOCs processing system adopts following technical scheme:
along the airflow direction, the device comprises a regulating unit, a filtering unit, an adsorption and desorption unit, an incineration unit and a heat storage and cooling unit which are connected in sequence;
the gas inlet end of the heat exchange unit is communicated with the gas outlet end of the filtering unit, and the gas outlet end of the heat exchange unit is communicated with the adsorption and desorption unit.
By adopting the technical scheme, part of the waste gas filtered by the filtering unit flows to the adsorption and desorption unit, and the rest of the waste gas flows to the heat exchange unit; waste gas gets into the adsorption desorption unit and adsorbs the concentration processing, and the clean waste gas after through the absorption is arranged outward and the waste gas that contains high concentration VOCs after the concentration desorption mixes with coming from heat transfer unit (the waste gas that does not pass through the adsorption desorption) and obtains high VOCs mixed waste gas, and high VOCs mixed waste gas gets into the unit of burning and burns afterwards. Through the control flow direction adsorption desorption unit and the waste gas proportion of flow direction heat transfer unit, can adjust the concentration of waiting to burn high VOCs mixed waste gas to the best condition of burning to can improve combustion efficiency, thereby improve VOCs's clearance.
In addition, in this application, through the control flow direction adsorption desorption unit and the waste gas proportion of flow direction heat transfer unit, can control the concentration of waiting to burn high VOCs mixed waste gas, adjust the concentration easy operation of waiting to burn high VOCs mixed waste gas, easy to carry out.
Preferably, the adjusting unit comprises a temperature and humidity adjusting unit; further preferably, the temperature and humidity adjusting unit includes a temperature and humidity adjusting and mixing device.
Through adopting above-mentioned technical scheme, the temperature and the humidity of the adjustable waste gas of humidifying mixing arrangement of adjusting the temperature, reducible humidity has promoted adsorption efficiency to adsorption material's influence to can improve the treatment effeciency of system. Compare with current single attemperator, the temperature and humidity regulation mixing arrangement of this application can carry out the regulation and control simultaneously to the temperature and the humidity of waste gas to can improve adsorption efficiency.
Preferably, a first hot clean flue gas return pipe is connected between the heat storage cooling unit and the temperature and humidity adjusting mixing device, the air inlet end of the first hot clean flue gas return pipe is connected with the heat storage cooling unit, and the air outlet end of the first hot clean flue gas return pipe is connected with the temperature and humidity adjusting box.
Through adopting above-mentioned technical scheme, through the clean flue gas reflux of the high temperature after will burning of first hot clean flue gas back flow, carry out the preliminary treatment to the original waste gas that contains VOCs. Compare with the system that uses "electrical heating to adjust the temperature" among the prior art, the clean flue gas of high temperature after this application burns self is as the heat source, and the original waste gas of pending is heated to the heat heating that fully uses VOCs self burning release, through from preheating the mode maintenance system normal operating, the current resource of make full use of, very big saving the power consumption to reduce the cost of handling waste gas.
Preferably, a second hot clean flue gas return pipe is connected between the heat storage cooling unit and the heat exchange unit, the air inlet end of the second hot clean flue gas return pipe is connected with the heat storage cooling unit, and the air outlet end of the second hot clean flue gas return pipe is connected with the heat exchange unit.
Through adopting above-mentioned technical scheme, the clean flue gas of high temperature after will burning is as the heat source, flows back to the absorption desorption unit through the hot clean flue gas back flow of second to desorption effect provides certain heat to be favorable to improving desorption efficiency.
In this application, the partly backward flow of the clean flue gas of high temperature after the burning is handled original waste gas, and another part backward flow is in desorption to adsorbing desorption unit helping hand, the abundant high temperature heat of having utilized after the burning, has realized the maximum utilization of limited resource.
Preferably, the adsorption and desorption unit is selected from any one of an activated carbon adsorption and desorption device and a molecular sieve rotating wheel. Further preferably, the activated carbon adsorption and desorption device and the molecular sieve rotating wheel both comprise an adsorption area and a desorption area.
Through adopting above-mentioned technical scheme, adsorb desorption unit and can be active carbon adsorption desorption device, also can be the molecular sieve runner, the system application scope of this application is wider.
Preferably, the incineration unit is selected from any one of an RTO and an RCO.
Through adopting above-mentioned technical scheme, the system of this application is applicable to "active carbon adsorption desorption + RTO" technology, "active carbon adsorption desorption + RCO" technology, "molecular sieve runner + RTO" technology and "molecular sieve runner + RCO" technology, and the system processing scope of this application is wider, can handle the VOCs waste gas discharge field that application, electron, chemical industry, pharmacy etc. are applicable to the combustion method.
Preferably, the filtering unit is a material filtering device, and particularly, a three-stage dry filtering device can be selected; the three-stage dry type filtering device comprises a primary filter, a secondary filter and an activated carbon filtering layer which are sequentially arranged.
By adopting the technical scheme, the primary filter is mainly used for filtering dust and particles with the particle size of more than 5 microns, the intermediate filter is used for filtering dust and particles with the particle size of 1-5 microns, and the active carbon filter layer is mainly used for filtering out high-boiling-point substances, so that the safety of the molecular sieve rotating wheel is guaranteed, and the low desorption efficiency caused by the pollution of zeolite by the high-boiling-point substances can be improved. The three-stage dry filter can better remove dust and paint mist, so that the waste gas meets the parameter requirements of adsorption and incineration.
In summary, the present application has the following beneficial effects:
1. part of the filtered waste gas flows to the adsorption area, the rest waste gas flows to the heat exchange unit, and the concentration of the waste gas to be incinerated can be regulated and controlled by controlling the proportion of the two parts of the waste gas, so that the concentration of the waste gas to be incinerated can be regulated to the optimum incineration concentration, the incineration efficiency can be improved, and the operation efficiency of a system can be improved;
2. according to the application, the heat released by self combustion of the high-VOCs waste gas is used as a heat source, part of the heat is used for heating the original waste gas to be treated, part of the heat is assisted by desorption, and the normal operation of the system is maintained in a self-preheating mode, so that the power consumption is greatly saved, and the treatment cost is reduced;
3. the waste gas temperature that this application released through the burning of high concentration VOCs waste gas self makes among the humidifying device that adjusts temperature is less than or equal to 40 ℃ and humidity is less than or equal to 80%, has realized adjusting and controlling simultaneously temperature and humidity, greatly improves adsorption efficiency when the cost of using electricity wisely, reduction, realizes low-cost and high-efficient processing VOCs waste gas.
Drawings
Fig. 1 is a flow chart of a method provided herein.
Fig. 2 is a cross-sectional view of a filter unit of the present application.
The attached drawings of the specification: 1. a temperature and humidity regulating unit; 2. a filtration unit; 21. a primary filter; 22. a medium-efficiency filter; 23. an activated carbon filter layer; 3. an adsorption and desorption unit; 31. an adsorption zone; 32. a desorption zone; 4. an incineration unit; 5. a heat storage and temperature reduction unit; 51. a first hot clean flue gas return pipe; 52. a second hot clean flue gas return pipe; 6. a heat exchange unit; 7. a chimney; 8. a raw exhaust gas inlet pipe.
Detailed Description
The present application is described in further detail below with reference to figures 1-2 and examples.
Referring to fig. 1, a processing system for VOCs is sequentially connected with a temperature and humidity adjusting unit 1, a filtering unit 2, an adsorption and desorption unit 3, an incineration unit 4 and a heat storage and temperature reduction unit 5 along an airflow direction. The temperature and humidity regulating unit 1 is connected with an original waste gas inlet pipe 8 for the original waste gas to enter the temperature and humidity regulating unit 1. The air outlet end of the heat storage and cooling unit 5 is connected with a chimney 7 and used for discharging clean flue gas after heat storage and cooling.
Referring to fig. 1, a first hot clean flue gas return pipe 51 is connected between the temperature and humidity adjusting unit 1 and the heat storage and temperature reduction unit 5, an air inlet end of the first hot clean flue gas return pipe 51 is connected with the heat storage and temperature reduction unit 5, an air outlet end of the first hot clean flue gas return pipe 51 is communicated with the original waste gas inlet pipe 8, and the first hot clean flue gas return pipe 51 can return the burnt high-temperature clean flue gas to the original waste gas inlet pipe 8 to be mixed with the original waste gas, so that mass and heat transfer can be performed.
Referring to fig. 1, the adsorption and desorption unit 3 includes an adsorption region 31 and a desorption region 32, and a first connection pipe is connected between the filter unit 2 and the adsorption region 31 and is used for conveying most of the filtered exhaust gas to the adsorption region 31; a heat exchange unit 6 is arranged between the filtering unit 2 and the desorption area 32, a second connecting pipe is connected between the heat exchange unit 6 and the filtering unit 2, and the second connecting pipe is used for conveying a small part of filtered waste gas to the heat exchange unit 6; a second hot clean flue gas return pipe 52 is connected between the heat exchange unit 6 and the heat storage cooling unit 5, and the second hot clean flue gas return pipe 52 returns part of the high-temperature clean flue gas subjected to heat storage cooling to the heat exchange unit 6 to be mixed with the waste gas from the filtering unit 2, so as to obtain mixed hot flue gas; a third connecting pipe is connected between the heat exchange unit 6 and the desorption area 32, and the third connecting pipe conveys the mixed hot smoke exhaust gas to the desorption area 32.
Referring to fig. 1, in the present application, a first exhaust pipe is connected between the adsorption region 31 and the chimney 7, and the first exhaust pipe can exhaust the adsorbed clean exhaust gas in the adsorption region 31 into the chimney 7 for centralized emission. A second smoke exhaust pipe is connected between the heat exchange unit 6 and the chimney 7, and the second smoke exhaust pipe can cool the hot clean smoke from the second hot clean smoke return pipe 52 and then discharge the cooled hot clean smoke to the chimney 7 for centralized discharge.
In the application, the temperature and humidity regulating unit 1 is a temperature and humidity regulating mixing device, the heat storage and temperature reduction unit 5 is a heat storage and temperature reduction device, and the heat exchange unit 6 is a heat exchanger.
Referring to fig. 2, the filter unit 2 is a three-stage dry filter device, and the three-stage dry filter device is composed of a primary filter 21, a secondary filter 22 and an activated carbon filter layer 23 which are sequentially installed along the flow direction of the exhaust gas.
In this application, adsorb desorption unit 3 and be active carbon adsorption desorption device, in another embodiment, adsorb desorption unit 3 and can be the molecular sieve runner.
In the present application, the incineration unit 4 is an RCO catalytic combustion device, and in another embodiment, the incineration unit 4 may also be an RTO regenerative thermal furnace.
The operation process of waste gas comprises the following steps:
the original waste gas and the hot clean flue gas from the first hot clean flue gas return pipe 51 are mixed in the original waste gas inlet pipe 8, and then enter the temperature and humidity regulating unit 1 for temperature and humidity regulation; then the waste gas enters the filtering unit 2 for filtering;
most of the filtered waste gas flows to the adsorption zone 31 through the first connecting pipe, the waste gas flowing to the adsorption zone 31 is changed into clean waste gas through the adsorption effect of the activated carbon in the adsorption zone 31, the clean waste gas is discharged into the chimney 7 through the first exhaust pipe, and VOCs in the waste gas are adsorbed on the activated carbon adsorption material. The remaining small part of the exhaust gas flows to the heat exchange unit 6 through the second connecting pipe, and is mixed with the hot clean flue gas from the second hot clean flue gas return pipe 52 in the heat exchange unit 6 to obtain mixed hot exhaust gas; adjust the temperature of mixed hot waste gas, the mixed hot waste gas flows into desorption district 32 through the third connecting pipe afterwards, and at this moment, the desorption under the heat that the last VOCs of activated carbon adsorption material provided under mixed hot waste gas forms high concentration VOCs waste gas. The hot clean flue gas from the second hot clean flue gas return pipe 52 is cooled and then discharged to the chimney 7 through the second smoke exhaust pipe.
The high concentration VOCs waste gas enters an incineration unit 4 (RCO catalytic combustion device) for combustion, and the combustion is carried out at high temperature, and the VOCs is oxidized and decomposed into CO2And H2And O. High-temperature clean flue gas generated after oxidation flows into the heat storage and cooling unit 5, and part of hot clean flue gas in the heat storage and cooling unit 5 flows back to the original waste gas inlet pipe 8 through the first hot clean flue gas return pipe 51; part of the hot clean flue gas flows back to the heat exchange unit 6 through the second hot clean flue gas return pipe 52; the residual hot clean flue gas is discharged into a chimney 7 for centralized discharge after being cooled.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A VOCs treatment system is characterized by comprising a regulating unit, a filtering unit (2), an adsorption and desorption unit (3), an incineration unit (4) and a heat storage and cooling unit (5) which are sequentially connected along the airflow direction;
the gas-liquid separation device is characterized by further comprising a heat exchange unit (6), wherein the gas inlet end of the heat exchange unit (6) is communicated with the gas outlet end of the filtering unit (2), and the gas outlet end of the heat exchange unit (6) is communicated with the adsorption and desorption unit (3).
2. The system of claim 1, wherein: the adjusting unit comprises a temperature and humidity adjusting unit (1).
3. The system of claim 2, wherein: the temperature and humidity regulating unit (1) comprises a temperature and humidity regulating mixing device.
4. The system of claim 2, wherein: be connected with first hot clean flue gas back flow (51) between heat accumulation cooling unit (5) and the humidifying unit that adjusts the temperature (1), the inlet end and the heat accumulation cooling unit (5) of first hot clean flue gas back flow (51) are connected, the end of giving vent to anger of first hot clean flue gas back flow (51) is connected with humidifying unit that adjusts the temperature (1).
5. The system of claim 1, wherein: a second hot clean flue gas return pipe (52) is connected between the heat storage cooling unit (5) and the heat exchange unit (6), the air inlet end of the second hot clean flue gas return pipe (52) is connected with the heat storage cooling unit (5), and the air outlet end of the second hot clean flue gas return pipe (52) is connected with the heat exchange unit (6).
6. The VOCs treatment system of any of claims 1-5, wherein: the adsorption and desorption unit (3) is selected from any one of an activated carbon adsorption and desorption device and a molecular sieve rotating wheel.
7. The VOCs treatment system of claim 6, wherein: the incineration unit (4) is selected from any one of RTO and RCO.
8. The system of claim 1, wherein: the filtering unit (2) comprises a primary filter (21), a secondary filter (22) and an activated carbon filtering layer (23) which are arranged in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120944084.XU CN214715478U (en) | 2021-04-30 | 2021-04-30 | VOCs processing system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120944084.XU CN214715478U (en) | 2021-04-30 | 2021-04-30 | VOCs processing system |
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| CN214715478U true CN214715478U (en) | 2021-11-16 |
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| CN202120944084.XU Active CN214715478U (en) | 2021-04-30 | 2021-04-30 | VOCs processing system |
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- 2021-04-30 CN CN202120944084.XU patent/CN214715478U/en active Active
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