CN117046255B - Device and process for recycling VOC (volatile organic compounds) in waste gas - Google Patents
Device and process for recycling VOC (volatile organic compounds) in waste gas Download PDFInfo
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- CN117046255B CN117046255B CN202311319183.9A CN202311319183A CN117046255B CN 117046255 B CN117046255 B CN 117046255B CN 202311319183 A CN202311319183 A CN 202311319183A CN 117046255 B CN117046255 B CN 117046255B
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- 239000002912 waste gas Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000012855 volatile organic compound Substances 0.000 title claims description 45
- 238000004064 recycling Methods 0.000 title abstract description 5
- 238000001179 sorption measurement Methods 0.000 claims abstract description 128
- 238000003795 desorption Methods 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000011084 recovery Methods 0.000 claims abstract description 27
- 238000009833 condensation Methods 0.000 claims abstract description 20
- 230000005494 condensation Effects 0.000 claims abstract description 20
- 230000008929 regeneration Effects 0.000 claims abstract description 12
- 238000011069 regeneration method Methods 0.000 claims abstract description 12
- 239000011229 interlayer Substances 0.000 claims abstract description 11
- 230000000712 assembly Effects 0.000 claims abstract description 8
- 238000000429 assembly Methods 0.000 claims abstract description 8
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 71
- 238000004891 communication Methods 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 14
- 238000009835 boiling Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000012806 monitoring device Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 1
- 239000012074 organic phase Substances 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 150000005826 halohydrocarbons Chemical class 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- -1 nitrogen hydrocarbons Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0438—Cooling or heating systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0454—Controlling adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses equipment and a process for recycling VOC in waste gas, which relate to the technical field of industrial waste gas purification and comprise the following steps: the input end of the condenser is sequentially connected with a filter and a connector, the condenser comprises two sets of condensing systems, and the connector is externally connected with a storage tank for storing initial waste gas; a recovery tank disposed adjacent to the condenser, the recovery tank for recovering organisms condensed by the condenser; the heat exchange tube group is connected with the output end of the condenser; the adsorption assemblies are arranged in a plurality, are communicated with the heat exchange tube groups, and are also connected with exhaust pipes; the desorption regeneration assembly comprises a dryer, the output end of the dryer is connected with an air supply pipe, and the air supply pipe is connected with the adsorption assembly; the temperature difference between the adsorption temperature and the condensation waste gas is reduced by heat exchange in the heat insulation interlayer, the temperature difference between the adsorption temperature and the adsorption temperature of the condensation waste gas and the adsorption temperature of the desorption waste gas is reduced, and the additional heating and cooling power consumption of the whole system is reduced.
Description
Technical Field
The application relates to the technical field of industrial waste gas purification, in particular to equipment and a process for recycling VOC in waste gas.
Background
Volatile Organic Compounds (VOCs) refer to a large class of organic compounds with a boiling point range of 50-260 ℃ and a saturated vapor pressure of more than 133.32Pa at room temperature, and exist in the air in vapor form at room temperature, and the volatile organic compounds are mainly composed of hydrocarbons, halohydrocarbons, nitrogen hydrocarbons, oxygenated hydrocarbons and the like, are main pollution gases in places such as sewage treatment plants, pharmaceutical factories and the like, and have great harm to environmental safety and human survival, so that relevant standards are formulated in China to limit the discharge of VOCs, and the VOCs are mainly recovered by a method combining a condensation method and an adsorption method to lighten environmental pollution at present so as to comprehensively solve the problems that a condensation method needs a condensation medium with lower temperature or a higher pressure and the adsorbent capacity is small.
However, in practical solutions, a single condenser is adopted to recover and then a plurality of separated adsorption tanks are attached to perform adsorption and desorption alternately, so that energy loss is serious in the whole process of temperature reduction condensation and temperature rise desorption processes of the VOC, high-temperature steam is usually adopted to assist in desorption for improving desorption efficiency, and pipelines are easily blocked due to moisture in the subsequent desorption VOC condensation recovery process.
It is therefore desirable to provide an apparatus and process for recovering VOCs from exhaust gases that addresses the problems set forth in the background.
Disclosure of Invention
In order to achieve the above purpose, the present application provides the following technical solutions: an apparatus for recovering VOCs in exhaust gas comprising:
the input end of the condenser is sequentially connected with a filter and a connector, the condenser comprises two sets of condensing systems, and the connector is externally connected with a storage tank for storing initial waste gas;
a recovery tank disposed adjacent to the condenser, and configured to recover organisms condensed by the condenser;
the heat exchange tube group is connected with the output end of the condenser;
the adsorption assemblies are arranged in a plurality, are communicated with the heat exchange tube groups, and are also connected with exhaust pipes, and a gas monitoring device is arranged in each exhaust pipe;
the desorption regeneration assembly comprises a dryer, wherein the output end of the dryer is connected with an air supply pipe, and the air supply pipe is connected with the adsorption assembly.
Further, preferably, the heat exchange tube group includes:
the outer pipe wall is internally sleeved with a heat-insulating interlayer, and the heat-insulating interlayer is internally provided with a first air inlet pipe, a second air inlet pipe, a first return pipe and a second return pipe;
the fixed bracket is arranged at the middle position of the first air inlet pipe, the second air inlet pipe, the first return pipe and the second return pipe.
Further, preferably, the heat exchange tube group further comprises a heat conducting lining plate, and the heat conducting lining plate is fixedly arranged between two adjacent pipelines of the first air inlet tube, the second air inlet tube, the first return tube and the second return tube.
Further, preferably, the first air inlet pipe and the second air inlet pipe are arranged oppositely, and the first return pipe and the second return pipe are arranged oppositely.
Further, preferably, the adsorption assembly includes:
the lower end of the tank body is fixedly provided with an air inlet interface and a reflux interface, the air inlet interface and the reflux interface are both connected with the heat exchange tube group, and the upper end of the tank body is fixedly provided with a desorption regeneration interface connected with the air supply tube and an exhaust interface connected with the exhaust tube;
the first adsorption layer is coaxially and fixedly arranged in the tank body;
and the second adsorption layer is coaxially fixed inside the first adsorption layer, and a temperature control component is arranged between the first adsorption layer and the second adsorption layer.
Further, preferably, a first cavity and a second cavity are formed between the first adsorption layer and the tank body and the temperature control assembly, a third cavity is formed between the second adsorption layer and the temperature control assembly, the center of the second adsorption layer is a fourth cavity, the first cavity and the second cavity are communicated with each other only through the first adsorption layer, and the third cavity and the fourth cavity are communicated with each other only through the second adsorption layer.
Further preferably, the temperature control assembly comprises an insulating layer and a temperature control element penetrating and fixed on the outer wall of the insulating layer.
Further, preferably, the air inlet interface is provided with a first air inlet valve for controlling communication with the first cavity and a second air inlet valve for controlling communication with the third cavity, and the backflow interface is provided with a first backflow valve for controlling communication with the first cavity and a second backflow valve for controlling communication with the third cavity.
Further, preferably, the desorption regeneration interface is provided with a first reset valve for controlling communication with the second cavity and a second reset valve for controlling communication with the fourth cavity, and the exhaust interface is provided with a first exhaust valve for controlling communication with the second cavity and a second exhaust valve for controlling communication with the fourth cavity.
In this embodiment, a process for recovering VOCs in exhaust gas includes:
i, after the initial waste gas is discharged from a storage tank and filtered by the filter, performing primary condensation recovery in the condenser through a first set of condensation system, transferring the separated organism phase into the recovery tank for storage, wherein the initial waste gas exhaust temperature is 40 ℃, and the condenser only needs to be cooled to the boiling point of VOC components in the condensation recovery process, and does not need to be pressurized to improve the recovery rate;
II, after the condensed waste gas enters the adsorption component through the heat exchange tube group to be adsorbed, forming exhaust tail gas to be discharged through the exhaust pipe, wherein the flow rate of the waste gas is controlled to be 0.05-0.15m/s when the waste gas passes through the first adsorption layer and the second adsorption layer, and the width of the active carbon layer in the first adsorption layer and the second adsorption layer is 400mm;
III, if the VOC content in the discharged tail gas is monitored to be out of standard, indicating that the adsorption assembly needs to be subjected to desorption treatment, specifically, providing high-temperature hot air through the dryer, conveying the hot air into the adsorption assembly through the air supply pipe, and desorbing the VOC enriched in the adsorption assembly to form desorption waste gas, wherein the desorption temperature is 110 ℃;
IV, conveying the desorption waste gas into the condenser again through the heat exchange tube group, and performing supplementary recovery through a second set of condensing system, wherein the formed supplementary condensing waste gas is continuously treated through the adsorption component, and the optimal adsorption temperature of the first adsorption layer and the second adsorption layer is 35 ℃;
v, discharging exhaust gas through the exhaust pipe, and likewise desorbing when the discharge is not up to standard, so as to form supplementary desorption exhaust gas for treatment.
Compared with the prior art, the application provides equipment and process for recycling VOC in waste gas, and has the following beneficial effects:
the temperature of the condensed waste gas and the supplementary condensed waste gas is lower, the temperature of the condensed waste gas and the supplementary condensed waste gas is required to be increased to the optimal adsorption temperature for adsorption treatment in the follow-up process, the temperature of the desorbed waste gas and the supplementary desorbed waste gas is higher, the temperature of the desorbed waste gas and the supplementary desorbed waste gas is required to be reduced to be lower than the boiling point of VCO in the follow-up process for condensation recovery, the temperature difference between the condensed waste gas and the supplementary condensed waste gas and the adsorption temperature is reduced through heat exchange in the heat insulation interlayer, the temperature difference between the auxiliary waste gas and the supplementary desorbed waste gas and the boiling point of VOC is reduced, and the additional heating and cooling power consumption of the whole system is reduced;
in this application when condensation waste gas or supplementary condensation waste gas pass adsorbed layer one or adsorbed layer two, all need to heat up to best adsorption temperature in order to improve adsorption efficiency, adsorbed layer one or adsorbed layer two have the cooling to recover the process after the desorption is accomplished, compare and adsorb desorption in turn and recover continuous work in setting up a plurality of tank groups, this device except keeping the continuity of work, retrieve the heat through temperature control element and carry out the temperature regulation of interior adsorption group and outer adsorption group, further reduce the holistic heat consumption of system, and through temperature control element supplementary intensification in desorption process, improve the efficiency of heating up, guarantee that hot-blast desorption normally goes on.
Drawings
FIG. 1 is a schematic view of the overall structure of an apparatus for recovering VOC in exhaust gas;
FIG. 2 is a schematic view of a heat exchange tube set in an apparatus for recovering VOC from exhaust gas;
FIG. 3 is a schematic diagram showing the upper part of the structure of an adsorption module in an apparatus for recovering VOC in exhaust gas;
FIG. 4 is a schematic view showing the lower part and internal cut-off structure of an adsorption module in an apparatus for recovering VOC in exhaust gas;
FIG. 5 is a schematic diagram of the cross-sectional structure and operation of an adsorption module in an apparatus for recovering VOCs from exhaust gas;
FIG. 6 is a schematic view of the longitudinal cross-sectional structure and operation of an adsorption module of an apparatus for recovering VOC in exhaust gas;
in the figure: 1. a condenser; 2. a filter; 3. a connector; 4. a recovery tank; 5. a heat exchange tube group; 51. an outer tube wall; 52. a heat preservation interlayer; 53. an air inlet pipe I; 54. an air inlet pipe II; 55. a return pipe I; 56. a return pipe II; 57. a fixed bracket; 58. a heat conducting lining plate; 6. an adsorption assembly; 61. a tank body; 62. an air inlet interface; 63. a reflow interface; 64. a desorption regeneration interface; 65. an exhaust interface; 66. an adsorption layer I; 661. a first accommodating cavity; 662. a second accommodating cavity; 663. an air inlet valve I; 664. an exhaust valve I; 665. resetting the valve I; 666. a first reflux valve; 67. an adsorption layer II; 671. a third cavity; 672. a fourth accommodating cavity; 673. an air inlet valve II; 674. an exhaust valve II; 675. a second reset valve; 676. a second reflux valve; 68. a temperature control assembly; 681. an insulating layer; 682. a temperature control element; 7. a desorption regeneration assembly; 71. a dryer; 72. an air supply pipe; 8. and an exhaust pipe.
Detailed Description
Referring to fig. 1-6, in an embodiment of the present application, an apparatus and a process for recovering VOCs in exhaust gas include:
the input end of the condenser 1 is sequentially connected with a filter 2 and a connector 3, the condenser 1 comprises two sets of condensing systems, and the connector 3 is externally connected with a storage tank for storing initial waste gas;
a recovery tank 4 disposed adjacent to the condenser 1, and the recovery tank 4 is for recovering organisms condensed by the condenser 1;
the heat exchange tube group 5 is connected with the output end of the condenser 1;
the adsorption assemblies 6 are arranged in a plurality, the adsorption assemblies 6 are communicated with the heat exchange tube groups 5, the adsorption assemblies 6 are also connected with exhaust pipes 8, a gas monitoring device is arranged in each exhaust pipe 8, and the gas monitoring device is used for judging whether the VOC content in the discharged waste gas is within the standard;
the desorption regeneration component 7 comprises a dryer 71, and an air supply pipe 72 is connected to the output end of the dryer 71, and the air supply pipe 72 is connected with the adsorption component 6.
In this embodiment, as shown in fig. 2, the heat exchange tube group 5 includes:
an outer pipe wall 51, in which a heat insulation interlayer 52 is sleeved, and an air inlet pipe I53, an air inlet pipe II 54, a return pipe I55 and a return pipe II 56 are arranged in the heat insulation interlayer 52; specifically, the first air inlet pipe 53 and the second air inlet pipe 54 sequentially circulate the condensed waste gas and the supplementary condensed waste gas, the first return pipe 55 and the second return pipe 56 sequentially pass through the desorption waste gas and the supplementary desorption waste gas, and the heat insulation interlayer 52 can reduce heat exchange between the internal pipeline and the external environment, so that heat dissipation is prevented from affecting heat exchange among the condensed waste gas, the supplementary condensed waste gas, the desorption waste gas and the supplementary desorption waste gas;
the fixing bracket 57 is arranged at the middle position of the first air inlet pipe 53, the second air inlet pipe 54, the first return pipe 55 and the second return pipe 56, and the relative positions of the first air inlet pipe 53, the second air inlet pipe 54, the first return pipe 55 and the second return pipe 56 are kept fixed through the fixing bracket 57.
It should be explained that, the lower temperature of the condensed exhaust gas and the supplementary condensed exhaust gas needs to be raised to the optimal adsorption temperature for adsorption treatment in the following process, and the higher temperature of the desorbed exhaust gas and the supplementary desorbed exhaust gas needs to be lowered below the VCO boiling point for condensation recovery in the following process, the temperature difference between the condensed exhaust gas and the supplementary condensed exhaust gas and the adsorption temperature is reduced by heat exchange in the heat-preserving interlayer 52, and the temperature difference between the auxiliary exhaust gas and the supplementary desorbed exhaust gas and the VOC boiling point is reduced, so that the additional heating and cooling power consumption of the whole system is reduced.
As a preferred embodiment, the heat exchange tube set 5 further includes a heat conducting liner plate 58, where the heat conducting liner plate 58 is fixedly disposed between two adjacent tubes of the first air inlet tube 53, the second air inlet tube 54, the first return tube 55 and the second return tube 56, and specifically, the heat exchange condition of the inner tube of the heat exchange tube set 5 is improved by the heat conducting liner plate 58, so that more heat conduction conditions are provided to improve the heat exchange efficiency.
As a preferred embodiment, the first air inlet pipe 53 and the second air inlet pipe 54 are arranged oppositely, the first return pipe 55 and the second return pipe 56 are arranged oppositely, and each specific adjacent pipeline has a temperature difference, so that the heat conduction and heat exchange distance can be well reduced, and the heat exchange efficiency can be improved.
In this embodiment, as shown in fig. 3 and 4, the adsorption assembly 6 includes:
the lower end of the tank body 61 is fixedly provided with an air inlet interface 62 and a reflux interface 63, the air inlet interface 62 and the reflux interface 63 are both connected with the heat exchange tube group 5, and the upper end of the tank body 61 is fixedly provided with a desorption regeneration interface 64 connected with the air supply tube 72 and an exhaust interface 65 connected with the exhaust tube 8;
the first adsorption layer 66 is coaxially and fixedly arranged inside the tank 61;
the second adsorption layer 67 is coaxially fixed inside the first adsorption layer 66, and a temperature control component 68 is arranged between the first adsorption layer 66 and the second adsorption layer 67.
It should be noted that the first and second adsorption layers 66 and 67 may use activated carbon as the adsorbent.
As a preferred embodiment, a first cavity 661 and a second cavity 662 are formed between the first adsorption layer 66 and the tank 61 and the temperature control component 68, a third cavity 671 is formed between the second adsorption layer 67 and the temperature control component 68, the center of the second adsorption layer 67 is a fourth cavity 672, the first cavity 661 and the second cavity 662 are only communicated with each other through the first adsorption layer 66, the third cavity 671 and the fourth cavity 672 are only communicated with each other through the second adsorption layer 67, the first adsorption layer 66, the first cavity 661 and the second cavity 662 form an outer adsorption group for adsorption treatment of condensed waste gas, and the second adsorption layer 67, the third cavity 671 and the fourth cavity 672 form an inner adsorption group for adsorption of complementary condensed waste gas.
As a preferred embodiment, the temperature control assembly 68 includes an insulating barrier 681 and a temperature control element 682 secured across the outer wall of the barrier 681, the temperature control element 682 being primarily assisted in temperature regulation by recovered heat.
It should be explained that, the ambient temperature has a significant influence on the adsorption performance and the desorption process of the activated carbon, when the condensed waste gas or the supplementary condensed waste gas passes through the first adsorption layer 66 or the second adsorption layer 67, the temperature needs to be raised to the optimal adsorption temperature to improve the adsorption efficiency, after the desorption is completed, the first adsorption layer 66 or the second adsorption layer 67 has a cooling and recovering process, compared with the process of alternately carrying out the adsorption and desorption recovery and continuous operation by arranging a plurality of tank groups, the device not only keeps the continuity of operation, but also carries out the temperature adjustment of the inner adsorption group and the outer adsorption group by recovering heat through the temperature control element 682, as shown in fig. 5 and 6, the first adsorption layer 66 carries out the adsorption operation, the second adsorption layer 67 carries out the desorption operation, the overall heat power consumption of the system is further reduced, but also the temperature is raised in an auxiliary way through the temperature control element 682 in the desorption process, and the heating efficiency is improved.
As a preferred embodiment, the air inlet port 62 is provided with an air inlet valve one 663 which is communicated with the first cavity 661 and an air inlet valve two 673 which is communicated with the third cavity 671, and the reflux port 63 is provided with a reflux valve one 666 which is communicated with the first cavity 661 and a reflux valve two 676 which is communicated with the third cavity 671.
As a preferred embodiment, the desorption regeneration port 64 is provided with a first reset valve 665 for controlling communication with the second cavity 662 and a second reset valve 675 for controlling communication with the fourth cavity 672, and the exhaust port 65 is provided with a first exhaust valve 664 for controlling communication with the second cavity 662 and a second exhaust valve 674 for controlling communication with the fourth cavity 672; specifically, the adsorption and desorption are ensured to be coordinated through the opening of the coordination control valve so as to recover the VOC in the waste gas.
In this embodiment, a process for recovering VOCs in exhaust gas includes:
i, after the initial waste gas is discharged from a storage tank and filtered by a filter 2, the initial waste gas is subjected to primary condensation recovery in a condenser 1 through a first set of condensation system, the separated organism phase is transferred into a recovery tank 4 for storage, the initial waste gas exhaust temperature is 40 ℃, and the condenser 1 only needs to be cooled to the boiling point of VOC components in the condensation recovery process, and does not need to be pressurized to improve the recovery rate;
II, after the condensed waste gas enters the adsorption component 6 through the heat exchange tube group 5 to be adsorbed, the exhaust tail gas is formed to be exhausted through the exhaust tube 8, and in order to ensure better adsorption efficiency, the flow speed of the waste gas when passing through the first adsorption layer 66 and the second adsorption layer 67 is controlled to be 0.05-0.15m/s, and the width of the active carbon layers in the first adsorption layer 66 and the second adsorption layer 67 is 400mm;
III, if the VOC content in the discharged tail gas is monitored to be out of standard, indicating that the adsorption assembly 6 needs to be subjected to desorption treatment, specifically, providing high-temperature hot air through a dryer 71, conveying the hot air into the adsorption assembly 6 through an air supply pipe 72, and desorbing the VOC enriched in the adsorption assembly 6 to form desorption waste gas, wherein the desorption temperature is 110 ℃;
IV, conveying the desorption waste gas into the condenser 1 again through the heat exchange tube group 5, performing supplementary recovery through a second set of condensing system, and continuously treating formed supplementary condensing waste gas through the adsorption assembly 6, wherein the optimal adsorption temperature of the first adsorption layer 66 and the second adsorption layer 67 is 35 ℃;
v, discharging exhaust gas through an exhaust pipe 8, and likewise desorbing when the discharge does not reach the standard, so as to form supplementary desorption exhaust gas for treatment.
The foregoing description is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, within the scope of the present application, should be covered by the protection scope of the present application, since all the technical solutions and the application concepts of the present application are equivalent and changed.
Claims (7)
1. An apparatus for recovering VOCs in exhaust gas, characterized by: comprising the following steps:
the input end of the condenser (1) is sequentially connected with a filter (2) and a connector (3), two sets of condensing systems are arranged in the condenser (1), and the connector (3) is externally connected with a storage tank for storing initial waste gas;
a recovery tank (4) disposed adjacent to the condenser (1), and the recovery tank (4) is for recovering organisms condensed by the condenser (1);
the heat exchange tube group (5) is connected with the output end of the condenser (1);
the adsorption assemblies (6) are arranged in a plurality, the adsorption assemblies (6) are communicated with the heat exchange tube groups (5), the adsorption assemblies (6) are also connected with exhaust pipes (8), and a gas monitoring device is arranged in each exhaust pipe (8);
the desorption regeneration assembly (7) comprises a dryer (71), wherein an output end of the dryer (71) is connected with an air supply pipe (72), and the air supply pipe (72) is connected with the adsorption assembly (6);
the adsorption assembly (6) comprises:
the air inlet connector (62) and the reflux connector (63) are fixedly arranged at the lower end of the tank body (61), the air inlet connector (62) and the reflux connector (63) are both connected with the heat exchange tube group (5), and the desorption regeneration connector (64) connected with the air supply tube (72) and the exhaust connector (65) connected with the exhaust tube (8) are fixedly arranged at the upper end of the tank body (61);
the first adsorption layer (66) is coaxially and fixedly arranged in the tank body (61);
the second adsorption layer (67) is coaxially fixed inside the first adsorption layer (66), and a temperature control assembly (68) is arranged between the first adsorption layer (66) and the second adsorption layer (67);
a first cavity (661) and a second cavity (662) are respectively formed between the first adsorption layer (66) and the tank body (61) and the temperature control component (68), a third cavity (671) is formed between the second adsorption layer (67) and the temperature control component (68), the center of the second adsorption layer (67) is a fourth cavity (672), the first cavity (661) and the second cavity (662) are communicated with each other only through the first adsorption layer (66), and the third cavity (671) and the fourth cavity (672) are communicated with each other only through the second adsorption layer (67);
the temperature control assembly (68) includes an insulating layer (681) and a temperature control element (682) secured through an outer wall of the insulating layer (681).
2. An apparatus for recovering VOCs in exhaust gas according to claim 1, wherein: the heat exchange tube group (5) includes:
an outer pipe wall (51) is internally sleeved with a heat insulation interlayer (52), and an air inlet pipe I (53), an air inlet pipe II (54), a return pipe I (55) and a return pipe II (56) are arranged in the heat insulation interlayer (52);
and the fixed bracket (57) is arranged at the middle positions of the first air inlet pipe (53), the second air inlet pipe (54), the first return pipe (55) and the second return pipe (56).
3. An apparatus for recovering VOCs in exhaust gas according to claim 2, characterized in that: the heat exchange tube group (5) further comprises a heat conduction lining plate (58), and the heat conduction lining plate (58) is fixedly arranged between two adjacent pipelines of the first air inlet tube (53), the second air inlet tube (54), the first return tube (55) and the second return tube (56).
4. An apparatus for recovering VOCs in exhaust gas according to claim 3, characterized in that: the first air inlet pipe (53) and the second air inlet pipe (54) are arranged oppositely, and the first return pipe (55) and the second return pipe (56) are arranged oppositely.
5. An apparatus for recovering VOCs in exhaust gas according to claim 1, wherein: the air inlet interface (62) is provided with an air inlet valve I (663) which is communicated with the cavity I (661) and an air inlet valve II (673) which is communicated with the cavity III (671), and the reflux interface (63) is provided with a reflux valve I (666) which is communicated with the cavity I (661) and a reflux valve II (676) which is communicated with the cavity III (671).
6. An apparatus for recovering VOCs in exhaust gas according to claim 5, wherein: the desorption regeneration interface (64) is provided with a first reset valve (665) for controlling communication with a second cavity (662) and a second reset valve (675) for controlling communication with a fourth cavity (672), and the exhaust interface (65) is provided with a first exhaust valve (664) for controlling communication with the second cavity (662) and a second exhaust valve (674) for controlling communication with the fourth cavity (672).
7. A process for recovering VOC from exhaust gas using an apparatus for recovering VOC from exhaust gas according to any one of claims 1 to 6, comprising:
i, filtering the initial waste gas discharged from a storage tank and filtered by the filter (2), and performing primary condensation recovery in the condenser (1) through a first set of condensation system, wherein the separated organic phase is transferred into the recovery tank (4) for storage, the initial waste gas discharge temperature is 40 ℃, and the condenser (1) only needs to be cooled to the boiling point of VOC components in the condensation recovery process, so that the recovery rate is improved without pressurization;
II, after condensed waste gas enters the adsorption component (6) through the heat exchange tube group (5) to be adsorbed, exhaust tail gas is formed to be discharged through the exhaust pipe (8), and in order to ensure better adsorption efficiency, the flow rate of the waste gas when passing through the first adsorption layer (66) and the second adsorption layer (67) is controlled to be 0.05-0.15m/s, and the widths of active carbon layers in the first adsorption layer (66) and the second adsorption layer (67) are 400mm;
III, if the VOC content in the discharged tail gas is monitored to be out of standard, indicating that the adsorption assembly (6) needs to be subjected to desorption treatment, specifically, providing high-temperature hot air by the dryer (71) and conveying the hot air into the adsorption assembly (6) through the air supply pipe (72), and desorbing the VOC enriched in the adsorption assembly (6) to form desorption waste gas, wherein the desorption temperature is 110 ℃;
IV, conveying the desorption waste gas into the condenser (1) again through the heat exchange tube group (5), performing supplementary recovery through a second set of condensing system, and continuously treating the formed supplementary condensing waste gas through the adsorption assembly (6), wherein the optimal adsorption temperature of the first adsorption layer (66) and the second adsorption layer (67) is 35 ℃;
v, discharging exhaust gas through the exhaust pipe (8), and likewise desorbing when the discharge is not up to standard, so as to form supplementary desorption exhaust gas for treatment.
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| CN202666652U (en) * | 2012-06-25 | 2013-01-16 | 临安创亿机械设备有限公司 | Nitrogen-desorbing organic waste gas recycling device |
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