WO2021093262A1 - 一种集吸收、解吸和回收为一体VOCs回收系统及方法 - Google Patents

一种集吸收、解吸和回收为一体VOCs回收系统及方法 Download PDF

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Publication number
WO2021093262A1
WO2021093262A1 PCT/CN2020/084401 CN2020084401W WO2021093262A1 WO 2021093262 A1 WO2021093262 A1 WO 2021093262A1 CN 2020084401 W CN2020084401 W CN 2020084401W WO 2021093262 A1 WO2021093262 A1 WO 2021093262A1
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absorption
vocs
unit
temperature
tower
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French (fr)
Chinese (zh)
Inventor
黄维秋
王鑫雅
黄洲乐
浮历沛
孙宪航
曹学明
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Changzhou University
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Changzhou University
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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
    • B01D53/14—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 absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • 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
    • B01D53/14—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 absorption
    • B01D53/1406—Multiple stage absorption
    • 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
    • B01D53/14—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 absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • 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
    • B01D53/14—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 absorption
    • B01D53/1487—Removing organic compounds
    • 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

Definitions

  • the invention belongs to the field of VOCs recovery processing, and specifically relates to a VOCs recovery system and method integrating absorption, desorption and recovery.
  • VOCs volatile organic compounds
  • its molecular structure also contains oxygen, nitrogen, sulfur, and chlorine, and its emissions It has brought many serious hazards to the society and enterprises. For example, when a large amount of VOCs evaporate and discharge, they will not only easily cause fire and explosion and other hazards due to the high density of VOCs, but also irritate the human respiratory tract and cause cancer and other hazards. In addition, it It is also the main reactant produced by photochemical smog, causing serious harm to ecology and the environment. my country's oil resources are limited, and it is also a big oil consumer and importer, so VOCs need to be effectively recovered.
  • the current recovery methods mainly use a single recovery method, including adsorption, absorption, condensation and membrane methods.
  • the single use of these methods will cause a series of problems and low recovery efficiency.
  • the absorption method has high requirements on the performance of the absorbent, the consumption of the absorbent is large, and the equipment occupies a large space, resulting in a low process recovery rate;
  • the adsorption method often selects adsorbents with relatively good adsorption performance and moderate prices, such as Activated carbon, but the adsorption heat of activated carbon is high, and the adsorption temperature rises rapidly, which reduces the adsorption performance and service life, and also increases safety hazards such as fire and explosion.
  • the condensation method requires high temperature and needs to condense the gas at a very low temperature. In order to achieve the ideal condensation effect, it has high requirements for materials and processes, and relatively high recovery and operating costs; membrane oil and gas recovery is a modern oil and gas separation technology that emerged in the late last century, and separation is achieved through different molecular sizes. It has a small footprint, safe operation and easy maintenance, but it usually needs to be combined with other processes to achieve good separation efficiency.
  • the technical problem to be solved by the present invention is: how to further improve the absorption efficiency of the VOCs recovery treatment system, and reduce energy consumption and operating costs.
  • a VOCs recovery system integrating absorption, desorption and recovery, including
  • Washing unit connected to the self-coupling pre-cooling unit, used to wash the VOCs intake air;
  • Self-coupling pre-cooling unit connected to the low-temperature absorption unit, used to condense the VOCs gas after washing;
  • Low-temperature absorption unit connected to the high-temperature desorption unit through the second heat exchanger 20, used to absorb the condensed VOCs gas;
  • High temperature desorption unit connected to the low temperature recovery unit through the heat exchanger 324, used to desorb the VOCs gas after low temperature absorption;
  • Low-temperature recovery unit connected to the low-temperature absorption unit, used to recover the liquefied VOCs, and at the same time, retransmit the unliquefied VOCs to the low-temperature absorption unit for processing.
  • the washing unit includes a washing tower 3, the washing tower is a segmented spray tower, including two layers of trays and two spray heads, the two spray heads are the washing tower, the first spray head 501 and the washing
  • the second-level spray head 502 of the tower, the first-level spray head 501 of the water washing tower and the second-level spray head 502 of the water washing tower are supplied by the first-level circulating spray pump 601 of the water washing tower and the second-level circulating spray pump 602 of the water washing tower respectively.
  • the layer tray is provided with a number of overflow small pipes 4. Realize the full water washing of more than 80% of the VOCs gas entering the water washing tower.
  • the self-coupling pre-cooling unit adopts an internal self-coupling one-to-two defrosting system; it includes a two-stage condensing device A 9, a two-stage condensing device B 10, and a first-stage condensing device 7.
  • the two-stage condensing device A, the two-stage condensing device B There are two connection modes between the condensing device B and the first condensing device: the first condensing circuit 2801 and the second condensing circuit 2802:
  • connection mode of the first condensing circuit is as follows: the inlet end of the secondary condensing device B is connected to the outlet end of the washing tower of the water washing unit; the outlet end of the secondary condensing device B is connected to the inlet end of the primary condensing device; the primary condensing device The outlet end of is connected to the inlet end of the secondary condensing device A; the outlet end of the secondary condensing device A is connected to the low-temperature absorption unit;
  • connection mode of the second condensing circuit is as follows: the inlet end of the second condensing device A is connected to the outlet end of the washing tower of the water washing unit; the outlet end of the second condensing device A is connected to the inlet end of the first condensing device; the first condensing device The outlet end of is connected to the inlet end of the secondary condensing device B; the outlet end of the secondary condensing device B is connected to the low-temperature absorption unit.
  • the primary condensing device, secondary condensing device A, and secondary condensing device B of the self-coupling pre-cooling unit are all connected to the liquid separation tank 11, the liquid separation tank 1 is divided by density, the middle is the buffer zone, and the left side is the organic matter Zone, the right side is the condensate zone.
  • the first condensing device is primary condensing
  • the second condensing device A and the second condensing device B are deep condensing.
  • the VOCs gas is deep condensed first, then the primary condensing, to avoid the frosting of the primary condensing device, and then through a deep condensing, the second
  • the two deep condensed gas outlet ends are the outlet ends of the self-coupling pre-cooling unit, and are connected to the inlet end of the low-temperature absorption unit.
  • the first condensing circuit When the secondary condensing device B is frosted and needs to be defrosted, the first condensing circuit is operated, and the VOCs gas is condensed through the secondary condensing device B, the primary condensing device and the secondary condensing device A in turn; when the secondary condensing device A is frosted When defrosting is required, the second condensing circuit is operated, and the VOCs gas is first condensed by the second condensing device A, and then condensed by the first condensing device and the second condensing device B in turn.
  • the low-temperature absorption unit includes an absorption tower 13.
  • the absorption tower is a segmented spray tower, including two layers of trays and two spray heads.
  • the gas inlet end of the absorption tower is set above the first layer of the absorption tower.
  • the second-layer tray of the absorption tower is provided with a number of overflow small pipes 14 for the transmission of VOCs gas and the overflow transmission of the second-layer absorption liquid.
  • the VOCs gas passes through the first layer of the absorption tower.
  • the spray head 1501 After the spray head 1501 is sprayed, it enters the second layer of the absorption tower from the overflow pipe 2 and is sprayed by the second layer spray head 1502 of the absorption tower to achieve full absorption of VOCs; the top of the absorption tower is also equipped with qualified Gas discharge port.
  • the cryogenic absorption unit includes a first self-circulating absorption liquid circuit 2803 and a second self-circulating absorption liquid circuit 2804:
  • the first self-circulating absorption liquid circuit the absorption liquid outlet of the first layer of the absorption tower is connected to the first-level spray head of the absorption tower through the first-stage circulating spray pump 1601 of the absorption tower to realize the spraying of VOCs gas;
  • the second self-circulating absorption liquid circuit the second-layer absorption liquid outlet of the absorption tower is connected to the second-layer spray head of the absorption tower through the absorption tower second-level circulating spray pump 1602 to realize further spraying of VOCs gas.
  • the high-temperature desorption unit includes a desorption tower 21, and the connection between the desorption tower and the absorption tower in the low-temperature absorption unit includes:
  • the first desorption circuit 2805 the absorption liquid outlet at the bottom of the absorption tower in the low-temperature absorption unit is connected to the absorption liquid inlet above the upper body of the desorption tower in the high-temperature desorption unit through the tube layer of the second heat exchanger;
  • the second desorption circuit 2806 the absorption liquid outlet under the bottom of the desorption tower in the high temperature desorption unit is connected to the inlet of the second self-circulating absorption liquid circuit in the low temperature absorption unit through the shell of the second heat exchanger;
  • the absorption liquid in the first self-circulating absorption liquid circuit, the second self-circulating absorption liquid circuit, the first desorption circuit and the second desorption circuit of the absorption tower and the absorption liquid in the absorption tower and the desorption tower constitute a flow balance.
  • the desorption tower in the high temperature desorption unit is connected to the absorption tower in the low temperature absorption unit through a recovery loop 2807.
  • the recovery loop is: the top outlet of the desorption tower is connected to the recovery horizontal tank 18 through the heat exchanger three and the vacuum pump 25 in turn, The top outlet of the recovery tank is connected to the inlet of the absorption tower.
  • the outlet end of the heat source 23 of the desorption tower in the high temperature desorption unit is connected to a steam trap 22.
  • the recovery horizontal tank of the low-temperature recovery unit is connected to the second liquid separation tank 19, the second liquid separation tank is divided by density, the middle is the buffer zone, the left side is the organic matter area, and the right side is the condensate water area.
  • the inlet end of the water washing unit is connected to the VOCs on-site gas through the flame arrestor 1; any unit and any pipeline are equipped with a gate valve 2 or an automatic control valve 8 or a ball valve 12 and a flow meter.
  • VOCs gas exchanges heat through the cold source 27 and the heat source to realize waste cooling recovery and condensation or vaporization of VOCs.
  • a heat exchanger 17 is provided between the absorption tower of the low-temperature absorption unit and the safety discharge port; the first heat exchanger uses the low-temperature gas discharged from the absorption tower of the low-temperature absorption unit for waste cooling recovery, and the self-coupling pre-cooling unit The latter cold source is supplemented with cold capacity;
  • a second heat exchanger is arranged between the absorption tower of the low-temperature absorption unit and the high-temperature desorption unit; the second heat exchanger utilizes the low-temperature absorption liquid discharged from the low-temperature absorption unit and the high-temperature absorption liquid desorbed from the high-temperature desorption unit for mutual heat recovery.
  • the primary condensing unit, secondary condensing unit A, secondary condensing unit B, heat exchanger 1, the internal heat exchanger in the absorption tower, and the internal heat exchanger in the recovery tank are all connected to the cold source through the recovery pump to desorb
  • the internal heat exchanger in the tower is connected with the heat source; the third heat exchanger is a circulating water heat exchanger.
  • a VOCs recovery method using a VOCs recovery processing system includes the following steps:
  • VOCs on-site air flow passes through the flame arrestor and the washing unit to remove ammonia, and then enters the self-coupling pre-cooling unit;
  • the low-temperature absorption unit runs the first self-circulating absorption liquid circuit and the second self-circulating absorption liquid circuit for absorption.
  • the first layer of rich absorption liquid of the absorption tower passes through the tube layer of heat exchanger 2 during the process of passing through the first desorption circuit. After the cold energy is recovered, it enters the desorption tower in the high temperature desorption unit for desorption; the desorbed fresh absorption liquid passes through the second desorption loop and passes through the shell of the heat exchanger 2 for heat recovery, and then the second layer of the absorption tower is lean Priority replenishment of absorbent;
  • the desorbed VOCs gas enters the recovery horizontal tank through the recovery loop to be condensed and liquefied for recovery, and the unliquefied VOCs gas is re-transmitted to the low-temperature absorption unit for absorption.
  • the present invention adopts the VOCs recovery method of water washing + self-coupling pre-cooling + low temperature absorption + high temperature desorption + low temperature recovery, and the advantages of multiple methods are combined and the disadvantages complement each other, which not only saves energy, but also realizes the recycling of absorption liquid, which greatly reduces Energy costs.
  • the present invention adopts a segmented washing tower and a segmented absorption tower to fully wash and absorb VOCs respectively.
  • Several overflow small pipes arranged on the two-layer tray realize the upward transmission of VOCs and the downward overflow transmission of liquid. Coupled with the self-circulating spray on the two layers of the tower, it not only improves the absorption efficiency and the use efficiency of the absorption liquid, but also reduces energy consumption and operating costs.
  • the invention adopts an internal self-coupling defrosting system, the three condensing devices are set up as one support and two types, and the internal circulating pipeline units are alternately operated according to the defrosting requirements, that is, two deep condensing devices are alternately used, which not only improves the pre-cooling efficiency It also uses the heat of the VOCs itself to alternately defrost the deep condensing device, which greatly saves energy consumption and avoids waste of energy consumption.
  • the first heat exchanger and the second heat exchanger in the present invention respectively recover the low-temperature gas and the low-temperature liquid of the absorption tower, thereby improving the heat utilization efficiency and reducing the energy consumption.
  • the self-coupling pre-cooling unit and the low-temperature recovery unit in the present invention are respectively provided with a liquid separation tank divided by density, the middle is a buffer zone, the left side is the organic matter area, and the right side is the condensate water area, which greatly improves the VOCs recovery rate and Use safety.
  • Figure 1 is a schematic diagram of the structural connection of a device according to an embodiment of the present invention.
  • 1-flame arrester 2-gate valve, 3-washing tower, 4-overflow small pipe one, 501-sprinkler head on the first floor of washing tower, 502-sprinkler head on the second stage of washing tower, and 601-first circulation of washing tower Spray pump, 602-water scrubber two-stage circulating spray pump, 7-stage condensing device, 8-automatic control valve, 9-stage condensing device A, 10-stage condensing device B, 11-separating tank 1 , 12-ball valve, 13-absorption tower, 14-overflow small pipe two, 1501- absorption tower first-level spray head, 1502- absorption tower second-level spray head, 1601- absorption tower first-level circulating spray pump, 1602- Absorption tower two-stage circulating spray pump, 17-heat exchanger one, 18-recovery horizontal tank, 19-separating tank two, 20-heat exchanger two, 21-desorption tower, 22-trap, 23-heat source, 24-heat exchanger three, 25-vacuum pump, 26-
  • FIG. 2 is a detailed structural connection diagram of a self-coupling pre-cooling unit in a device according to an embodiment of the present invention
  • Figure 3 is a schematic cross-sectional view of the overflow small pipe of the two-layer tray of the washing tower or the absorption tower in an embodiment of the present invention
  • Fig. 4 is a schematic diagram of the process of VOCs in an embodiment of the present invention passing through the overflow small pipe of the two-layer tray of the water washing tower or the absorption tower;
  • Figure 5 is a partial schematic diagram of the process of VOCs in an embodiment of the present invention passing through the two-layer tray overflow small pipe of the absorption tower;
  • a VOCs processing system of the present invention as shown in Figure 1, including
  • Washing unit connected to the self-coupling pre-cooling unit, used to wash the VOCs intake air;
  • Self-coupling pre-cooling unit connected to the low-temperature absorption unit, used to condense the VOCs gas after washing;
  • Low-temperature absorption unit connected to the high-temperature desorption unit through the second heat exchanger 20, used to absorb the condensed VOCs gas;
  • High temperature desorption unit connected to the low temperature recovery unit through the heat exchanger 324, used to desorb the VOCs gas after low temperature absorption;
  • Low-temperature recovery unit connected to the low-temperature absorption unit, used to recover the liquefied VOCs, and at the same time, re-send the non-liquefied VOCs to the low-temperature absorption unit for processing.
  • the washing unit as shown in Figures 3 and 4 includes a washing tower 3.
  • the washing tower is a segmented spray tower and includes two layers of trays and two spray heads.
  • the two spray heads are one layer of the washing tower.
  • the spray head 501 and the second-level spray head 502 of the washing tower, the first-level spray head 501 of the water-washing tower and the second-level spray head 502 of the water-washing tower are respectively sprayed by the first-level circulating spray pump 601 of the water-washing tower and the second-level circulating spray of the water-washing tower.
  • the pump 602 supplies water, and the second layer of tray is provided with a number of overflow small pipes 4. Realize the full water washing of more than 80% of the VOCs gas entering the water washing tower.
  • the self-coupling pre-cooling unit as shown in Figure 2 adopts an internal self-coupling one-to-two defrosting system; it includes a secondary condensing device A 9, a secondary condensing device B 10, and a primary condensing device 7.
  • the secondary condensing device A There are two connection modes between the second condensing device B and the first condensing device: the first condensing circuit 2801 and the second condensing circuit 2802:
  • connection mode of the first condensing circuit is as follows: the inlet end of the secondary condensing device B is connected to the outlet end of the washing tower of the water washing unit; the outlet end of the secondary condensing device B is connected to the inlet end of the primary condensing device; the primary condensing device The outlet end of is connected to the inlet end of the secondary condensing device A; the outlet end of the secondary condensing device A is connected to the low-temperature absorption unit;
  • connection mode of the second condensing circuit is as follows: the inlet end of the second condensing device A is connected to the outlet end of the washing tower of the water washing unit; the outlet end of the second condensing device A is connected to the inlet end of the first condensing device; the first condensing device The outlet end of is connected to the inlet end of the secondary condensing device B; the outlet end of the secondary condensing device B is connected to the low-temperature absorption unit.
  • the primary condensing device, secondary condensing device A, and secondary condensing device B of the self-coupling pre-cooling unit are all connected to the liquid separation tank 11, the liquid separation tank 1 is divided by density, the middle is the buffer zone, and the left side is the organic matter Zone, the right side is the condensate zone.
  • the first condensing device is primary condensing
  • the second condensing device A and the second condensing device B are deep condensing.
  • the VOCs gas is deep condensed first, then the primary condensing, to avoid the frosting of the primary condensing device, and then through a deep condensing, the second
  • the two deep condensed gas outlet ends are the outlet ends of the self-coupling pre-cooling unit, and are connected to the inlet end of the low-temperature absorption unit.
  • the first condensing circuit When the secondary condensing device B is frosted and needs to be defrosted, the first condensing circuit is operated, and the VOCs gas is condensed through the secondary condensing device B, the primary condensing device and the secondary condensing device A in turn; when the secondary condensing device A is frosted When defrosting is required, the second condensing circuit is operated, and the VOCs gas is first condensed by the second condensing device A, and then condensed by the first condensing device and the second condensing device B in turn.
  • the low-temperature absorption unit as shown in Figures 3, 4, and 5 includes an absorption tower 13, which is a segmented spray tower and includes two trays and two spray heads.
  • the gas inlet of the absorption tower is set at The first layer of the absorption tower is higher than the upper level of the absorption liquid.
  • the second layer of the absorption tower is provided with a number of overflow small pipes 14 for the transmission of VOCs gas and the overflow transmission of the second layer of absorption liquid.
  • the VOCs gas After being sprayed by the spray nozzle 1501 on the first layer of the absorption tower, the VOCs gas enters the second layer of the absorption tower from the second overflow pipe, and then sprayed by the spray nozzle 1502 on the second layer of the absorption tower to realize the full absorption of VOCs.
  • the top of the absorption tower is also equipped with a qualified gas discharge port.
  • the cryogenic absorption unit includes a first self-circulating absorption liquid circuit 2803 and a second self-circulating absorption liquid circuit 2804:
  • the first self-circulating absorption liquid circuit the absorption liquid outlet of the first layer of the absorption tower is connected to the first-level spray head of the absorption tower through the first-stage circulating spray pump 1601 of the absorption tower to realize the spraying of VOCs gas;
  • the second self-circulating absorption liquid circuit the second-layer absorption liquid outlet of the absorption tower is connected to the second-layer spray head of the absorption tower through the absorption tower second-level circulating spray pump 1602 to realize further spraying of VOCs gas.
  • the high-temperature desorption unit includes a desorption tower 21, and the connection between the desorption tower and the absorption tower in the low-temperature absorption unit includes:
  • the first desorption circuit 2805 the absorption liquid outlet at the bottom of the absorption tower in the low-temperature absorption unit is connected to the absorption liquid inlet on the upper body of the desorption tower in the high-temperature desorption unit through the tube layer of the second heat exchanger;
  • the second desorption circuit 2806 the absorption liquid outlet under the bottom of the desorption tower in the high temperature desorption unit is connected to the inlet of the second self-circulating absorption liquid circuit in the low temperature absorption unit through the shell of the second heat exchanger;
  • the absorption liquid in the first self-circulating absorption liquid circuit, the second self-circulating absorption liquid circuit, the first desorption circuit and the second desorption circuit of the absorption tower and the absorption liquid in the absorption tower and the desorption tower constitute a flow balance.
  • the desorption tower in the high temperature desorption unit is connected to the absorption tower in the low temperature absorption unit through a recovery loop 2807.
  • the recovery loop is: the top outlet of the desorption tower is connected to the recovery horizontal tank 18 through the heat exchanger three and the vacuum pump 25 in turn, The top outlet of the recovery tank is connected to the inlet of the absorption tower.
  • the recovery horizontal tank of the low-temperature recovery unit is connected to the second liquid separation tank 19, the second liquid separation tank is divided by density, the middle is the buffer zone, the left side is the organic matter area, and the right side is the condensate water area.
  • the inlet end of the water washing unit is connected to the VOCs on-site gas through the flame arrestor 1; any unit and any pipeline are equipped with gate valves 2 or automatic control valves 8 or ball valves 12 and flow meters; the heat source of the desorption tower in the high temperature desorption unit 23 is connected to a steam trap 22 at the outlet end.
  • VOCs gas exchanges heat through the cold source 27 and the heat source to realize waste cooling recovery and condensation or vaporization of VOCs.
  • a VOCs recovery method integrating absorption, desorption and recovery includes the following steps:
  • VOCs on-site air flow passes through the flame arrestor and the washing unit to remove ammonia, and then enters the self-coupling pre-cooling unit;
  • the low-temperature absorption unit runs the first self-circulating absorption liquid circuit and the second self-circulating absorption liquid circuit for absorption.
  • the first layer of rich absorption liquid of the absorption tower passes through the tube layer of heat exchanger 2 during the process of passing through the first desorption circuit. After the cold energy is recovered, it enters the desorption tower in the high temperature desorption unit for desorption; the desorbed fresh absorption liquid passes through the second desorption loop and passes through the shell of the heat exchanger 2 for heat recovery, and then the second layer of the absorption tower is lean Priority replenishment of absorbent;
  • the desorbed VOCs gas enters the recovery horizontal tank through the recovery loop to be condensed and liquefied for recovery, and the unliquefied VOCs gas is re-transmitted to the low-temperature absorption unit for absorption.
  • the VOCs gas enters the secondary condensing unit B, and then passes through the primary condensing unit 7 and the secondary condensing unit A to condense and remove water from the VOCs, and then the uncondensed VOCs gas enters the low-temperature absorption unit Absorption tower.
  • the VOCs gas is first sprayed and absorbed in the first layer of the absorption tower. At this time, a large amount of VOCs is absorbed by the absorption liquid; the remaining VOCs gas enters the second layer of the absorption tower through the overflow tube 2 for fresh absorption liquid spraying. The water is absorbed deeply, and the qualified gas is discharged from the safety discharge port through the heat exchanger.
  • step 3 in addition to spraying the second-layer absorption liquid of the absorption tower, when the liquid level exceeds the second overflow port of the overflow small pipe, the absorption liquid overflows into the first-layer rich absorption liquid of the absorption tower.
  • the high-temperature VOCs gas is recovered from the top outlet of the desorption tower 21 through the recovery loop, that is, the circulating water is initially cooled through the heat exchanger three, and then enters the low-temperature recovery tank through the vacuum pump 25 to make the gaseous state VOCs are liquefied, the liquefied VOCs are recovered, and the unliquefied VOCs are re-entered into the absorption tower to continue processing.
  • the heat exchange equipment includes:
  • the heat exchanger 17 arranged between the low-temperature absorption unit and the safety discharge port is connected to the cold source through the recovery pump 26. In order to recover the residual cold of the discharged low-temperature gas, it supplements the cold source cold from the self-coupling pre-cooling unit. the amount;
  • the second heat exchanger is arranged between the absorption tower of the low-temperature absorption unit and the high-temperature desorption unit; one end of any heat exchange pipeline in the second heat exchanger is connected to the low-temperature absorption unit, and the other end is connected to the low-temperature absorption unit.
  • the high temperature desorption unit is connected.
  • the second heat exchanger utilizes the low-temperature absorption liquid discharged from the low-temperature absorption unit and the high-temperature absorption liquid desorbed by the high-temperature desorption unit to mutually recover heat;
  • Heat exchanger three arranged between the high-temperature desorption unit and the low-temperature recovery unit;
  • the third heat exchanger is a circulating water heat exchanger, in order to prevent high-temperature VOCs from damaging the vacuum pump.
  • the low-temperature VOCs cooled by the heat exchanger 3 are transported to the recovery horizontal tank by the vacuum pump and then further condensed, and the VOCs converted into liquid are stored in the liquid separation tank 2 of the low-temperature recovery unit;
  • the primary condensing device, secondary condensing device A, and secondary condensing device B arranged in the self-coupling pre-cooling unit; the primary condensing device, secondary condensing device A, and secondary condensing device B pass through the recovery pump Connected to the cold source;
  • It also includes internal heat exchangers built into the absorption tower, desorption tower, and recovery tank, and heat exchange circulation pipelines in the heat exchange unit.
  • the internal heat exchangers in the absorption tower and the recovery tank are connected to the cooling system through the recovery pump.
  • the source is connected, and the internal heat exchanger in the desorption tower is connected with the heat source.
  • the cold source is a refrigerant
  • the heat source is water vapor with a temperature higher than 100°C.
  • the VOCs recovery system specifically includes:
  • Gate valve water washing tower, first-level spray head of water washing tower, second-level spray head of water washing tower, water storage tank, first-level circulating spray pump of water washing tower and second-level circulating spray pump of water washing tower constitute a water washing unit, which passes through the flame arrester.
  • VOCs need to go through a water washing device, the purpose is to remove ammonia and wash away a large amount of water-soluble impurities through water washing.
  • the washing tower is vertical, with a height of 3m ⁇ 15m and a diameter of 0.5m ⁇ 3m.
  • the washing tower is designed as a segmented spray type.
  • the two-layer tray is equipped with a number of overflow small pipes.
  • the diameter of the overflow pipes is The height is 5mm ⁇ 10mm, and the total cross-sectional area is 5% ⁇ 15% of the cross-sectional area of the tray.
  • the first floor of the washing tower is equipped with a water storage tank with a water storage capacity of 0.5 to 10 tons, and the spraying capacity is 5m 3 /h ⁇ 50m 3 /h
  • the second-layer water source of the washing tower is supplied through the water replenishment port
  • the replenishing water volume is 1m 3 /h ⁇ 5m 3 /h
  • the spraying volume is 5m 3 /h ⁇ 50m 3 /h
  • the water washing tower recovers the amount of ammonia (water) It is 5kg/h ⁇ 100kg/h.
  • the top of the absorption tower is equipped with a VOCs outlet, and there is a VOCs inlet below the tower body and above the highest liquid level of the absorption liquid.
  • the gas enters from below and contacts the sprayed absorption liquid in a reverse direction to achieve full absorption.
  • the absorption tower is also designed as a segmented spray type.
  • the two-layer tray is equipped with a number of overflow small pipes.
  • the diameter of the overflow small pipes is The height is 5mm ⁇ 10mm, and the total cross-sectional area is 5% ⁇ 15% of the cross-sectional area of the tray; the diameter of the tower body is generally determined according to the amount of oil and gas processed, and the height of the tower body is generally 3m ⁇ 15m, and the diameter is 0.5m ⁇ 3m.
  • the storage height is 0.3m ⁇ 4m
  • the design operating temperature of the tower is -25°C ⁇ -5°C
  • the flow rate of the cold source in the internal heat exchanger is 0.5m 3 /h 2 ⁇ 3m 3 /h 2
  • the amount of spraying on the first layer is equal to
  • the spray rate of the second layer is 5m 3 /h ⁇ 50m 3 /h.
  • the desorption tower uses high temperature steam as the heat medium.
  • the diameter of the tower is 0.1m ⁇ 3m, the height is 0.5m ⁇ 5m, the high temperature steam temperature is 120°C ⁇ 150°C, the steam consumption is 1kg/h ⁇ 5kg/h, and the desorption capacity is 0.5kg/h ⁇ 50kg/h.
  • the recovery horizontal tank has a diameter of 0.2m-3m, a length of 0.5m-5m, and a recovered liquid volume of 0.5kg/h-50kg/h.
  • the circulating water temperature in the heat exchanger three is 10°C ⁇ 100°C, and the flow rate is 0.01m 3 /h ⁇ 2m 3 /h.
  • the refrigerant pipeline connected to the cold source is generally DN10 ⁇ DN20, the temperature of the refrigerant is -25°C ⁇ -10°C, and the flow of the refrigerant is 1m 3 /h ⁇ 20m 3 /h .

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  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
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CN113546494A (zh) * 2021-08-18 2021-10-26 西安超滤环保科技股份有限公司 一种液封吸附除尘装置及其使用方法
CN114887425A (zh) * 2022-06-02 2022-08-12 淮阴工学院 一种化灰尾气的抗堵塞洗涤塔
CN115089992A (zh) * 2022-07-07 2022-09-23 连云港市拓普科技发展有限公司 浅冷吸附脱附VOCs气体回收方法
CN115417018A (zh) * 2022-08-16 2022-12-02 浙江省天正设计工程有限公司 一种本质安全仓储罐区呼吸气液氮直冷工艺及装置
CN117547928A (zh) * 2023-11-15 2024-02-13 上海开鸿环保科技有限公司 有机氟代化合物ahf法合成尾气深冷耦合吸附脱硝净化系统
CN119345860A (zh) * 2024-09-20 2025-01-24 东华工程科技股份有限公司 一种集约化voc尾气水洗系统
CN121401802A (zh) * 2025-12-26 2026-01-27 江西瑞京鸿兴实业有限公司 一种木塑地板造粒废气综合处理装置及其处理方法

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CN112275097A (zh) * 2020-11-09 2021-01-29 常州大恒净化技术有限公司 VOCs回收系统及其回收方法
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CN113546494A (zh) * 2021-08-18 2021-10-26 西安超滤环保科技股份有限公司 一种液封吸附除尘装置及其使用方法
CN114887425A (zh) * 2022-06-02 2022-08-12 淮阴工学院 一种化灰尾气的抗堵塞洗涤塔
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CN115089992B (zh) * 2022-07-07 2024-05-10 连云港市拓普科技发展有限公司 浅冷吸附脱附VOCs气体回收方法
CN115417018A (zh) * 2022-08-16 2022-12-02 浙江省天正设计工程有限公司 一种本质安全仓储罐区呼吸气液氮直冷工艺及装置
CN117547928A (zh) * 2023-11-15 2024-02-13 上海开鸿环保科技有限公司 有机氟代化合物ahf法合成尾气深冷耦合吸附脱硝净化系统
CN119345860A (zh) * 2024-09-20 2025-01-24 东华工程科技股份有限公司 一种集约化voc尾气水洗系统
CN121401802A (zh) * 2025-12-26 2026-01-27 江西瑞京鸿兴实业有限公司 一种木塑地板造粒废气综合处理装置及其处理方法

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