CN113181741A - Radial adsorption fixed bed VOCs adsorption regeneration unit and system - Google Patents
Radial adsorption fixed bed VOCs adsorption regeneration unit and system Download PDFInfo
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- CN113181741A CN113181741A CN202110463824.2A CN202110463824A CN113181741A CN 113181741 A CN113181741 A CN 113181741A CN 202110463824 A CN202110463824 A CN 202110463824A CN 113181741 A CN113181741 A CN 113181741A
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 112
- 238000011069 regeneration method Methods 0.000 title claims abstract description 51
- 230000008929 regeneration Effects 0.000 title claims abstract description 49
- 239000012855 volatile organic compound Substances 0.000 title claims abstract description 47
- 239000002912 waste gas Substances 0.000 claims abstract description 80
- 239000007789 gas Substances 0.000 claims abstract description 66
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 12
- 238000009833 condensation Methods 0.000 abstract description 11
- 230000005494 condensation Effects 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 230000004907 flux Effects 0.000 abstract description 4
- 239000003570 air Substances 0.000 description 24
- 239000003463 adsorbent Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 239000012080 ambient air Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001699 photocatalysis Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
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- 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
- B01D53/0415—Beds in cartridges
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
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- 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
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- 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
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- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Gases By Adsorption (AREA)
- Treating Waste Gases (AREA)
Abstract
A VOCs adsorption regeneration unit and a VOCs adsorption regeneration system of a radial adsorption fixed bed comprise a circular cylinder, wherein the bottom of the circular cylinder is provided with a waste gas inlet pipe, a regeneration steam inlet pipe and a cooling air inlet pipe, and each pipeline is respectively provided with a waste gas inlet valve, a regeneration steam inlet valve and a cooling air inlet valve; the top of the circular cylinder is provided with a purified waste gas discharge pipe and a mixed gas discharge pipe, and the purified waste gas discharge pipe and the mixed gas discharge pipe are both provided with control valves; an active carbon adsorption unit is arranged in the circular cylinder, a waste gas inlet channel is arranged between the active carbon adsorption unit and the inner wall of the cylinder, and a waste gas discharge channel is arranged in the active carbon adsorption unit; the system comprises the radial adsorption fixed bed, a condensate water evaporation heat exchanger, an oil-water separation device and a regenerated steam condensation cooling heat exchanger. The invention increases the cross section area of the waste gas flow, improves the total flux of the waste gas adsorption process and improves the flexibility of treating VOCs by waste gas.
Description
Technical Field
The invention relates to a device for adsorbing and regenerating air pollution pollutants VOCs (volatile organic compounds), belonging to the technical field of VOCs treatment.
Background
O in ambient air3And haze are major pollution factors of the atmosphere, and the generation mechanism and control measures of the haze become hot problems in research and engineering practice. In production and life, the emission of Volatile Organic Compounds (VOCs) can affect the change of the indexes, and particularly, under the irradiation of sunlight, the VOCs and NOx in ambient air can generate photochemical smog and O3And secondary organic particulate matter (SOA), whereby the control of VOCs is O in ambient air3One of the key factors in control.
VOCs in production and life generate more source points and are complicated in industry, so that the bent paths and the teaching and training in the VOCs engineering treatment process are more, and the successful schemes such as Regenerative Thermal Oxidizer (RTO), Regenerative Catalytic Oxidizer (RCO), rotating wheel adsorption-desorption and other technologies are most successfully applied to specific emission sources in special industries. The technologies of VOCs control measures with wide adaptability and single function, such as adsorption, photocatalytic oxidation, low-temperature plasma oxidation and the like, are influenced by factors such as engineering parameters, safety and the like, and the engineering application of the technologies is obviously limited. Based on basic scientific principles, adsorption, photocatalytic oxidation and low-temperature plasma oxidation are all effective methods for treating the waste gas containing the VOCs, but in engineering practice, the treatment technology is limited by engineering principles, industries, production processes and the like, and the VOCs waste gas with single function cannot reach the limit value of the standard requirement due to the characteristics of combustibility, explosion and the like of most VOCs. In most cases, the concentration of VOCs in the exhaust gas is not high, i.e. the exhaust gas with large air volume and lower concentration of VOCs is the emission characteristic of the exhaust gas containing VOCs which is more common in production and life. The large air volume and low resistance conveying characteristic of waste gas treatment leads to the strict limitation of the height of a fixed bed layer in the simple and effective operation of an adsorption unit, and the strict limitation of the particle size of an adsorbent or the sectional area of an air passing channel of a honeycomb adsorbent and the like. The limitation of the total amount of adsorbent due to the limitation of the cross-sectional area and height, and the adsorption-regeneration period is also severely limited. Under the general condition, the height of the adsorption bed layer of the VOCs fixed bed with large air volume successfully operated in engineering is not more than 1m, the sectional area of the fixed bed is limited by the air volume, the general size is large, the total occupied area is large, and the waste gas VOCs of some existing projects are difficult to transform and expand.
Most of the currently commonly used cylindrical adsorption fixed beds are in axial steady-state uniform flow and are limited by the field public facility conditions of VOCs emission sources, and the design parameters of many adsorption fixed beds are difficult to meet the requirements of isothermal adsorption and temperature-changing regeneration of adsorbents such as activated carbon, silicon molecular sieves and other materials. Pressure Swing Adsorption (PSA) used in industrial high pressure adsorption processes is also difficult to achieve due to large air volume and low air pressure.
Disclosure of Invention
Aiming at the defects of the existing VOCs adsorption treatment technology, the invention provides a radial adsorption fixed bed VOCs adsorption regeneration unit and a system which increase the sectional area of waste gas flow and improve the total flux in the waste gas adsorption process.
The VOCs adsorption regeneration unit of the radial adsorption fixed bed adopts the following technical scheme:
the radial adsorption fixed bed comprises a circular cylinder, wherein a waste gas inlet pipe, a regeneration steam input pipe and a cooling air inlet pipe are arranged at the bottom of the circular cylinder, and a waste gas inlet valve, a regeneration steam input valve and a cooling air inlet valve are respectively arranged on each pipeline; the top of the circular cylinder is provided with a purified waste gas discharge pipe and a mixed gas discharge pipe, the purified waste gas discharge pipe is provided with a purified waste gas discharge valve, and the mixed gas discharge pipe is provided with a blow-off mixed gas output valve; an active carbon adsorption unit is arranged in the circular cylinder, a waste gas inlet channel is arranged between the active carbon adsorption unit and the inner wall of the circular cylinder, and a waste gas discharge channel is arranged in the active carbon adsorption unit; the waste gas runs along the waste gas inlet channel, passes through the activated carbon layer along the radial direction and then enters the waste gas outlet channel to be discharged.
And a regenerated condensed water output pipe is arranged at the bottom of the circular cylinder and used for discharging condensed water generated after the activated carbon adsorption bed is cooled by regenerated steam.
And the periphery of the round cylinder body is provided with a heat insulation layer.
The length-diameter ratio of the activated carbon adsorption unit is less than 1:10 so as to increase the sectional area of the waste gas flow by a factor of 2L/rm。
The top of the waste gas inlet channel is blocked, and the bottom of the waste gas inlet channel is communicated with a waste gas inlet pipe; the bottom of the waste gas discharge channel is blocked, and the top of the waste gas discharge channel is communicated with a purified waste gas discharge pipe and a mixed gas discharge pipe. Thus, the exhaust gas is caused to travel along the exhaust gas inlet passage, radially through the activated carbon layer, and then into the exhaust gas outlet passage to be discharged.
The integral adsorption system comprises the radial adsorption fixed bed, a condensate water evaporation heat exchanger, an oil-water separation device and a regenerated steam condensation cooling heat exchanger; a regenerated steam input pipe at the bottom of the radial adsorption fixed bed is connected with a condensed water evaporation heat exchanger, and a regenerated condensed water output pipe is connected with an oil-water separation device; the mixed gas exhaust pipe at the top is divided into two branches which are connected with the regenerated steam condensing and cooling heat exchanger in parallel, on one hand, the mixed gas exhaust pipe is connected with the regenerated steam condensing and cooling heat exchanger through a mixed gas direct exhaust pipe, and a straight-through valve is arranged on the mixed gas direct exhaust pipe; on one hand, the regeneration steam condensing and cooling heat exchanger is connected through a vacuum pump; the regenerated steam condensing and cooling heat exchanger is connected with the oil-water separation device. The radial adsorption fixed bed can be used in parallel or in series with a plurality of (more than two) fixed beds so as to improve the flexibility of treating VOCs by waste gas.
The inlet and the outlet of each radial adsorption fixed bed are connected with a waste gas pipeline, a steam heating pipeline and an air cooling pipeline through valves. During adsorption operation, only the waste gas pipeline valve is opened, and other pipeline valves are closed; during regeneration operation, the steam heating pipeline is opened, and other inlet and outlet valves are closed. After the fixed bed adsorbs saturated VOCs, steam stripping regeneration is needed, and the mixed gas after steam stripping comprises water vapor, non-condensable gas in a bed layer and desorbed VOCs. And the mixed gas enters a steam condensation cooling heat exchanger to condense and cool water vapor into mixed liquid, and the rest non-condensable gas contains a certain amount of VOCs and then enters a condenser emptying pipeline to be subjected to adsorption treatment by other radial adsorption fixed beds in adsorption operation. The cooled condensate containing VOCs may be separated in a separator, such as a rectifying tower or oil-water separator, to recover mainly VOCs and the steam condensate separated in the separator. The separated waste water containing a small amount of VOCs enters a reheater and is gasified to be used as a steam closed cycle, and oil-containing waste water is not generated. After the steam heat regeneration is finished, the temperature of the adsorption bed layer is reduced to reach the ambient temperature by air stripping, and the adsorption-regeneration cycle is finished. And after the temperature reduction is finished, restarting the adsorption operation period.
The invention adopts a cylindrical radial adsorption fixed bed and a steam temperature-changing adsorbent regeneration process, waste gas flows in a stable and non-uniform manner through the radial fixed bed, the axial section restriction of the waste gas flow is converted into the section area of the cylinder wall flowing in a radial manner, the increase of the flow section area of the waste gas can be realized by improving the length-diameter ratio of the cylindrical adsorption fixed bed, and the total flux of the waste gas adsorption process is improved. And secondly, the unit is used as a radial adsorption fixed bed, the length-diameter ratio is changed, the total volume and the adsorbent amount of an adsorption bed layer are successfully improved, and the unit can be connected in parallel or in series for use, so that the flexibility of treating VOCs by waste gas is improved.
Drawings
FIG. 1 is a schematic flow diagram of the fixed bed adsorption and radial adsorptive regeneration of VOCs in the present invention.
In the figure: 1. the device comprises a cylinder radial adsorption fixed bed, 2 a waste gas inlet valve, 3 a regenerated steam valve, 4 a regenerated steam input pipe, 5 a condensed water evaporation heat exchanger, 6 an oil-water separation device, 7 a regenerated steam condensation cooling heat exchanger, 8 a draught fan, 9 a blow-off mixed gas output valve, 10 a purified waste gas discharge valve, 11 a mixed gas discharge pipe, 12 a waste gas inlet pipe, 13 a non-condensable gas return pipe, 14 a purified waste gas discharge pipe, 15 an activated carbon adsorption unit, 16 a waste gas inlet channel, 17 a waste gas discharge channel, 18 a cooling air inlet pipe, 19 a cooling air inlet valve, 20 a regenerated condensed water output pipe, 21 a regenerated condensed water output valve, 22 a mixed gas direct discharge pipe and 23 a direct discharge valve.
Detailed Description
As shown in FIG. 1, the present invention employs a cylindrical radial adsorption fixed bed 1 having a cylindrical shape. The bottom of the circular cylinder of the radial adsorption fixed bed 1 is provided with a waste gas inlet pipe 12, a regeneration steam inlet pipe 4, a regeneration condensed water output pipe 20 and a cooling air inlet pipe 18, and each pipeline is respectively provided with a waste gas inlet valve 2, a regeneration steam inlet valve 3, a regeneration condensed water output valve 21 and a cooling air inlet valve 19. The top of the circular cylinder is provided with a purified waste gas discharge pipe 14 and a mixed gas discharge pipe 11, the purified waste gas discharge pipe 14 is provided with a purified waste gas discharge valve 10, and the mixed gas discharge pipe 11 is provided with a blow-off mixed gas output valve 9. An active carbon adsorption unit 15 is arranged in the cylinder, a waste gas inlet channel 16 is arranged between the active carbon adsorption unit 15 and the inner wall of the cylinder, the top of the waste gas inlet channel 16 is blocked, and the bottom of the waste gas inlet channel is communicated with a waste gas inlet pipe 12. The inside of the activated carbon adsorption unit 15 is provided with an exhaust gas discharge passage 17, the bottom of the exhaust gas discharge passage 17 is blocked, and the top is communicated with the purified exhaust gas discharge pipe 14 and the mixed gas discharge pipe 11. Thus, the exhaust gas is caused to travel along the exhaust gas inlet passage 16, radially through the activated carbon layer, and then into the exhaust gas outlet passage 17 to be discharged.
The regenerated condensed water outlet pipe 20 is used for discharging condensed water generated after steam cooling for regenerating the activated carbon adsorption bed 2. The cooling air inlet pipe 18 is used to introduce air to cool the activated carbon adsorption bed 2 after passing through the steam regeneration so as to reach the ambient temperature as soon as possible. The regeneration steam input pipe 4 is used for inputting steam to regenerate the activated carbon adsorption unit 15 participating in adsorption.
The waste gas is in a steady-state non-uniform flow when passing through the radial fixed bed 1, and the gas flow is converted from a limited axial flow section into a radial flow section of the cylinder wall. An increase in the cross-sectional area of the exhaust gas stream by a factor of 2L/r can be achieved by increasing the length to diameter ratio (i.e., the value of L/D, which is generally less than 1:10) of the activated carbon adsorption unit 15mAnd the total flux of the waste gas adsorption process is improved. And secondly, the adsorbent is used as a radial adsorption fixed bed, the length-diameter ratio is changed, and the total volume of an adsorption bed layer and the total amount of an adsorbent are successfully improved. In order to ensure the heat insulation performance of the radial adsorption fixed bed 1 in the regeneration process, the outer wall of the circular cylinder body is provided with a heat insulation layer. In consideration of the regeneration efficiency of the activated carbon adsorption unit 15, the exhaust system can ensure a certain vacuum degree of the non-condensable gas outlet, and the temperature and pressure changing measures are comprehensively adopted to improve the regeneration adsorption capacity of the adsorption material.
The integral adsorption system of the invention, referring to figure 1, comprises a cylindrical radial adsorption fixed bed 1, a condensed water evaporation heat exchanger 5, an oil-water separation device 6 and a regenerated steam condensation cooling heat exchanger 7. The regenerated steam input pipe 4 at the bottom of the radial adsorption fixed bed 1 is connected with a condensed water evaporation heat exchanger 5, and the regenerated condensed water output pipe 20 is connected with an oil-water separation device 6. The mixed gas exhaust pipe 11 at the top is divided into two branches and is connected with the regenerated steam condensing and cooling heat exchanger 7 in parallel, on one hand, the mixed gas exhaust pipe 22 is connected with the regenerated steam condensing and cooling heat exchanger 7, and the mixed gas exhaust pipe 22 is provided with a straight-through valve 23; on the one hand, the regeneration steam condensation cooling heat exchanger 7 is connected through a vacuum pump 8. The regenerated steam condensing and cooling heat exchanger 7 is connected with the oil-water separation device 6.
The radial adsorption fixed bed 1 can be used in parallel or in series, so that the flexibility of treating VOCs by waste gas is improved. All the valves are connected with a PLC controller, and the PLC controller controls the operation of the whole system and each adsorption fixed bed 1.
The operation of the above system for adsorption regeneration is as follows.
The plurality of radial adsorption fixed beds can share the condensed water evaporation heat exchanger 5, the oil-water separation device 6 and the regenerated steam condensation cooling heat exchanger 7. When one or more radial adsorption fixed beds 1 are in a regeneration working state, other radial adsorption fixed beds are in an adsorption working state, the regeneration process takes less time, and therefore, more units are generally operated in the adsorption state.
For the radial adsorption fixed bed 1 in the adsorption working state, the waste gas inlet valve 2 is opened, and the waste gas enters the radial adsorption fixed bed 1 and is radially adsorbed by the activated carbon adsorption unit 15. In the adsorption operation state, the purified exhaust gas discharge valve 10 is opened, and the purified exhaust gas is discharged along the purified exhaust gas discharge pipe 14. When the adsorbent (activated carbon) in the activated carbon adsorption unit 15 is saturated or reaches the breakthrough point of the breakthrough curve, the radial adsorption fixed bed needs to be subjected to steam stripping regeneration.
For the radial adsorption fixed bed 1 in the regeneration working state, the waste gas inlet valve 2 and the purified waste gas discharge valve 10 are closed, and the regeneration steam input valve 3, the blow-off mixed gas output valve 9, the straight-through valve 23 and the regeneration condensate water output valve 21 are opened, so that steam enters the cylindrical radial adsorption fixed bed 1 through the regeneration steam input pipe 4. At this time, the exhaust gas is not introduced any more, but the adsorbent is heated by water vapor until the temperature of the whole activated carbon adsorption unit 15 reaches a suitable temperature (for example, 100 ℃). The mixed gas after steam stripping comprises water vapor, non-condensable gas in the bed layer and desorbed VOCs. The water vapor carries VOCs removed from the adsorbent and is discharged along the mixed gas direct discharging pipe 22 through the mixed gas discharging pipe 11, directly enters the regenerated steam condensation cooling heat exchanger 7, is condensed in the regenerated steam condensation cooling heat exchanger 7, and generates hot regenerated condensation mixed liquid and a small amount of regenerated non-condensable gas. The heat regeneration condensation mixed liquid enters an oil-water separation device 6, condensed water containing organic matters and condensed organic matters are separated, the condensed water containing the organic matters enters a condensed water evaporation heat exchanger 5 to be heated into water vapor, the water vapor is recycled as regenerated steam, and the condensed organic matters are discharged and collected and treated in a centralized mode. The regenerated non-condensable gas enters other radial adsorption fixed beds 1 in an adsorption state through a non-condensable gas return pipe 13, and is discharged after adsorption treatment is carried out again. The hot regenerated condensate water generated in the fixed bed 1 is radially adsorbed in the regeneration process and enters the oil-water separation device 6 through a regenerated condensate water output pipe 20.
After the steam heating is finished, the vacuum pump 8 is started, the straight-through valve 23 is closed, and the mixed gas exhaust pipe 8 is switched to the working state of the vacuum pump 8, so that a certain vacuum degree is generated in the radial adsorption fixed bed 1, and the regeneration adsorption capacity of the adsorbent is increased. The cooling air inlet valve 19 is opened, and clean air is introduced into the radial adsorption fixed bed 1 from the cooling air inlet pipe 18 for cooling so as to reach the ambient temperature as soon as possible, and the adsorption working state is switched again. The air after participating in the cooling is discharged through the purified exhaust gas discharge pipe 14 (the exhaust gas discharge valve 10 is opened). In order to ensure the purification effect and prevent the discharged cooling air from containing a small amount of VOCs, the initial cooling air can be firstly introduced into the mixed gas main output pipe 19 for subsequent treatment, when no VOCs exists in the cooling air, the mixed gas is discharged through the purified waste gas discharge pipe 14, and the specific logic process can be controlled by the PLC to blow off the switching between the mixed gas output valve 9 and the waste gas discharge valve 10.
Claims (7)
1. The utility model provides a radial absorption fixed bed VOCs adsorbs regeneration unit which characterized by: the device comprises a circular cylinder, wherein a waste gas inlet pipe, a regeneration steam input pipe and a cooling air inlet pipe are arranged at the bottom of the circular cylinder, and a waste gas inlet valve, a regeneration steam input valve, a regeneration condensate water output valve and a cooling air inlet valve are respectively arranged on each pipeline; the top of the circular cylinder is provided with a purified waste gas discharge pipe and a mixed gas discharge pipe, the purified waste gas discharge pipe is provided with a purified waste gas discharge valve, and the mixed gas discharge pipe is provided with a blow-off mixed gas output valve; an active carbon adsorption unit is arranged in the circular cylinder, a waste gas inlet channel is arranged between the active carbon adsorption unit and the inner wall of the circular cylinder, and a waste gas discharge channel is arranged in the active carbon adsorption unit; the waste gas runs along the waste gas inlet channel, passes through the activated carbon layer along the radial direction and then enters the waste gas outlet channel to be discharged.
2. The radial adsorption fixed bed VOCs adsorption regeneration unit of claim 1, wherein: and a regenerated condensed water output pipe is arranged at the bottom of the circular cylinder.
3. The radial adsorption fixed bed VOCs adsorption regeneration unit of claim 1, wherein: and the periphery of the round cylinder body is provided with a heat insulation layer.
4. The radial adsorption fixed bed VOCs adsorption regeneration unit of claim 1, wherein: the length-diameter ratio of the activated carbon adsorption unit is less than 1: 10.
5. The radial adsorption fixed bed VOCs adsorption regeneration unit of claim 1, wherein: the top of the waste gas inlet channel is blocked, and the bottom of the waste gas inlet channel is communicated with a waste gas inlet pipe; the bottom of the waste gas discharge channel is blocked, and the top of the waste gas discharge channel is communicated with a purified waste gas discharge pipe and a mixed gas discharge pipe.
6. The utility model provides a radial absorption fixed bed VOCs adsorbs regeneration system which characterized by: comprising the radial adsorption fixed bed according to any one of claims 1 to 4, a condensate evaporation heat exchanger, a water oil separation device and a regeneration steam condensing cooling heat exchanger; a regenerated steam input pipe at the bottom of the radial adsorption fixed bed is connected with a condensed water evaporation heat exchanger, and a regenerated condensed water output pipe is connected with an oil-water separation device; the mixed gas exhaust pipe at the top is divided into two branches which are connected with the regenerated steam condensing and cooling heat exchanger in parallel, on one hand, the mixed gas exhaust pipe is connected with the regenerated steam condensing and cooling heat exchanger through a mixed gas direct exhaust pipe, and a straight-through valve is arranged on the mixed gas direct exhaust pipe; on one hand, the regeneration steam condensing and cooling heat exchanger is connected through a vacuum pump; the regenerated steam condensing and cooling heat exchanger is connected with the oil-water separation device.
7. The system of claim 6 wherein the system further comprises: more than two radial adsorption fixed beds are connected in parallel or in series.
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| CN202110463824.2A CN113181741A (en) | 2021-04-28 | 2021-04-28 | Radial adsorption fixed bed VOCs adsorption regeneration unit and system |
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| CN202110463824.2A CN113181741A (en) | 2021-04-28 | 2021-04-28 | Radial adsorption fixed bed VOCs adsorption regeneration unit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053827A (en) * | 2021-12-07 | 2022-02-18 | 绍兴金泰容器制造有限公司 | Organic waste gas adsorption and purification device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368779A (en) * | 2019-08-22 | 2019-10-25 | 北京石油化工学院 | A kind of VOCs gas is radial to be adsorbed and desorption recyclable device and system |
| CN110605107A (en) * | 2019-09-24 | 2019-12-24 | 常州大学 | Low-emission integrated adsorbent in-situ regeneration device |
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- 2021-04-28 CN CN202110463824.2A patent/CN113181741A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110368779A (en) * | 2019-08-22 | 2019-10-25 | 北京石油化工学院 | A kind of VOCs gas is radial to be adsorbed and desorption recyclable device and system |
| CN110605107A (en) * | 2019-09-24 | 2019-12-24 | 常州大学 | Low-emission integrated adsorbent in-situ regeneration device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114053827A (en) * | 2021-12-07 | 2022-02-18 | 绍兴金泰容器制造有限公司 | Organic waste gas adsorption and purification device |
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Application publication date: 20210730 |