CN116808773A - Oil gas recovery system and method for train warehouse sweeping gas treatment - Google Patents
Oil gas recovery system and method for train warehouse sweeping gas treatment Download PDFInfo
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- CN116808773A CN116808773A CN202310912335.XA CN202310912335A CN116808773A CN 116808773 A CN116808773 A CN 116808773A CN 202310912335 A CN202310912335 A CN 202310912335A CN 116808773 A CN116808773 A CN 116808773A
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- 238000010408 sweeping Methods 0.000 title claims abstract description 113
- 238000011084 recovery Methods 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001179 sorption measurement Methods 0.000 claims abstract description 316
- 239000007788 liquid Substances 0.000 claims abstract description 81
- 238000000926 separation method Methods 0.000 claims abstract description 53
- 239000012071 phase Substances 0.000 claims description 110
- 238000009833 condensation Methods 0.000 claims description 90
- 230000005494 condensation Effects 0.000 claims description 90
- 238000003795 desorption Methods 0.000 claims description 73
- 238000012544 monitoring process Methods 0.000 claims description 55
- 238000007664 blowing Methods 0.000 claims description 32
- 229920006395 saturated elastomer Polymers 0.000 claims description 27
- 239000003507 refrigerant Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 13
- 239000010865 sewage Substances 0.000 claims description 10
- 239000008346 aqueous phase Substances 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 4
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram 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
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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
- B01D53/002—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/40—Further details for adsorption processes and devices
- B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
- B01D2259/40086—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by using a purge gas
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- Separation Of Gases By Adsorption (AREA)
Abstract
The application discloses an oil gas recovery system for train sweeping gas treatment, which comprises a three-phase separator and an adsorption tank group; the inlet of the three-phase separator is connected with a train sweeping gas collecting pipe, and the gas phase outlet of the three-phase separator is connected with the bottom port of the adsorption tank group; the gas phase outlet of the three-phase separator is also connected with the heat source inlet of the heat exchanger, the heat source outlet of the heat exchanger is connected with the inlet of the primary gas-liquid separation tank, the outlet of the top of the primary gas-liquid separation tank is connected with the medium inlet of the evaporator, the medium outlet of the evaporator is connected with the inlet of the secondary gas-liquid separation tank, the outlet of the top of the secondary gas-liquid separation tank is connected with the cold source inlet of the heat exchanger, and the cold source outlet of the heat exchanger is connected with the bottom end port of the adsorption tank group; the bottom port of the adsorption tank group is provided with a vacuumizing system. The application also discloses an oil gas recovery method for the train sweeping gas treatment. The application adsorbs the small-gas-quantity and intermittently-discharged sweeping gas through the adsorption tank and then reaches the standard to discharge, thereby reducing the environmental pollution and meeting the discharge requirement.
Description
Technical Field
The application belongs to the technical field of oil gas recovery, and particularly relates to an oil gas recovery system and method for train warehouse sweeping gas treatment.
Background
The train tank wagon has the problem that oil is not completely pumped after oil is discharged, so that a lot of bottom oil remains in the tank wagon, a vacuum system is generally adopted at present to pump sweeping gas formed by the bottom oil and oil gas remaining in the train tank wagon to a gas-liquid separation tank of an oil storage warehouse, and the sweeping gas is directly discharged to the atmosphere from the top of the gas-liquid separation tank.
The existing treatment method can cause environmental pollution by directly discharging the sweeping gas from the top of the gas-liquid separation tank to the atmosphere. In addition, the train tank wagon oil discharge place is usually far away from the gas-liquid separation tank of the oil storage warehouse, and the sweeping gas needs to be led to the gas-liquid separation tank through the laying pipeline, so that the sweeping gas has the characteristics of small gas consumption and long discharge interval time, and becomes a main problem affecting the cost investment and the normal operation of the sweeping gas treatment system.
Based on the problems, the application provides the oil gas recovery system and the method for the treatment of the train sweeping gas, which are used for adsorbing the sweeping gas with small gas quantity and intermittent discharge through the adsorption tank and then discharging the sweeping gas up to the standard through the processes of intermittent adsorption flow, adsorption condensation flow and concentrated desorption condensation recovery flow, so that the environmental pollution is reduced, and the discharge requirement is met.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide an oil gas recovery system for train warehouse sweeping gas treatment.
In order to achieve the above purpose, the application adopts the following technical scheme:
an oil gas recovery system for train sweeping gas treatment comprises a three-phase separator and an adsorption tank group with two parallel adsorption tanks;
the inlet of the three-phase separator is connected with a train sweeping gas collecting pipe, the oil phase outlet of the three-phase separator is connected with the oil recovery device through a pipeline, the liquid phase outlet of the three-phase separator is connected with a sewage pipe network, and the gas phase outlet of the three-phase separator is connected with the bottom port of the adsorption tank group through a pipeline;
the gas phase outlet of the three-phase separator is also connected with the heat source inlet of the heat exchanger through a pipeline, the heat source outlet of the heat exchanger is connected with the inlet of the primary gas-liquid separation tank through a pipeline, the top outlet of the primary gas-liquid separation tank is connected with the medium inlet of the evaporator, the medium outlet of the evaporator is connected with the inlet of the secondary gas-liquid separation tank through a pipeline, the top outlet of the secondary gas-liquid separation tank is connected with the cold source inlet of the heat exchanger, and the cold source outlet of the heat exchanger is connected with the bottom end port of the adsorption tank group;
the bottom outlets of the primary gas-liquid separation tank and the secondary gas-liquid separation tank are communicated with a three-phase separator;
the evaporator is also connected with a refrigerating system;
the bottom port of the adsorption tank group is provided with a vacuumizing system, the vacuumizing system comprises a vacuum pump, an inlet of the vacuum pump is connected with the bottom port of the adsorption tank group through a pipeline, and an outlet of the vacuum pump is connected with an inlet of the three-phase separator and a heat source inlet of the heat exchanger through pipelines respectively.
Preferably, an air inlet switch valve is arranged on a train sweeping bin air collecting pipe connected with an inlet of the three-phase separator;
an oil pump is arranged on a pipeline between an oil phase outlet of the three-phase separator and the oil recovery device, and a recovery oil switch valve is arranged on an outlet pipeline of the oil pump;
and a sewage switch valve is arranged on the sewage pipe network.
Preferably, two adsorption tanks connected in parallel in the adsorption tank group are a first adsorption tank and a second adsorption tank respectively;
a first air inlet cut-off valve is arranged on a pipeline between the first adsorption tank and a gas phase outlet of the three-phase separator;
and a second air inlet cut-off valve is arranged on a pipeline between the second adsorption tank and the gas phase outlet of the three-phase separator.
Preferably, a first vacuumizing cut-off valve is arranged on a pipeline between the first adsorption tank and the inlet of the vacuum pump; the top outlet of the first adsorption tank is also connected with a first back-blowing pipeline, and a first back-blowing switch valve is arranged on the first back-blowing pipeline;
a second vacuumizing cut-off valve is arranged on a pipeline between the second adsorption tank and the vacuum pump; the top outlet of the second adsorption tank is also connected with a second back-blowing pipeline, and a second back-blowing switch valve is arranged on the second back-blowing pipeline;
a first cut-off valve is arranged on a pipeline between the outlet of the vacuum pump and the inlet of the three-phase separator;
a second shut-off valve is arranged on a pipeline between the outlet of the vacuum pump and the heat source inlet of the heat exchanger;
an oil gas cooling condensation switch valve is arranged on a pipeline between a gas phase outlet of the three-phase separator and a heat source inlet of the heat exchanger;
a first adsorption switch valve is arranged on a pipeline between the heat exchanger cold source outlet and the bottom port of the first adsorption tank;
and a second adsorption switch valve is arranged on a pipeline between the heat exchanger cold source outlet and the bottom port of the second adsorption tank.
Preferably, a first oil gas discharge switch valve is arranged on a top outlet discharge pipeline of the first adsorption tank;
and a second oil gas discharge switch valve is arranged on a top outlet discharge pipeline of the second adsorption tank.
Preferably, the three-phase separator is provided with an oil phase liquid level monitoring instrument for monitoring the liquid level of the oil phase and a water phase liquid level monitoring instrument for monitoring the liquid level of the water phase.
Preferably, a first vacuumizing pressure monitoring instrument for monitoring the vacuum degree in the first adsorption tank is arranged on a pipeline between the first adsorption tank and the vacuum pump;
a second vacuumizing pressure monitoring instrument for monitoring the vacuum degree in the second adsorption tank is arranged on a pipeline between the second adsorption tank and the vacuum pump;
and the first adsorption tank and the second adsorption tank are respectively provided with an adsorption temperature monitoring instrument for monitoring the adsorption temperature inside the corresponding adsorption tank.
Preferably, a heat source inlet temperature monitoring instrument is arranged on a heat source inlet pipeline of the heat exchanger;
a cold source outlet temperature monitoring instrument is arranged on a cold source outlet pipeline of the heat exchanger;
a heat source outlet temperature monitoring instrument is arranged on a heat source outlet pipeline of the heat exchanger;
an evaporator outlet temperature monitoring instrument is arranged on a medium outlet pipeline of the evaporator.
Preferably, the refrigeration system comprises a gas-liquid separator, a compressor, an oil separator, an air cooler and a refrigerant liquid storage tank;
the gas phase outlet of the gas-liquid separator is connected with the inlet of the compressor through a pipeline, the outlet of the compressor is connected with the inlet of the oil separator through a pipeline, the gas phase outlet of the oil separator is connected with the inlet of the air cooler through a pipeline, the outlet of the air cooler is connected with the inlet of the refrigerant liquid storage tank through a pipeline, the outlet of the refrigerant liquid storage tank is connected with the refrigerant inlet of the evaporator through a pipeline, and the refrigerant outlet of the evaporator is connected with the inlet of the gas-liquid separator through a pipeline.
The application also comprises an oil gas recovery method for the train sweeping gas treatment.
The oil gas recovery method for the train sweeping gas treatment is implemented by adopting an oil gas recovery system for the train sweeping gas treatment and comprises an intermittent adsorption process, an adsorption condensation process and a concentrated desorption condensation recovery process;
when the sweeping gas needs to be treated and both the adsorption tanks are not saturated, starting an intermittent adsorption process to adsorb the sweeping gas;
when the sweeping gas needs to be treated and one of the adsorption tanks is saturated in adsorption, starting an adsorption condensation process to perform adsorption treatment on the sweeping gas, and performing condensation recovery and secondary adsorption treatment on the desorption regenerated gas;
when the treatment of the bin sweeping gas is finished and one of the adsorption tanks is saturated in adsorption, starting a concentrated desorption condensation recovery process to pre-separate, condense and recover desorption regenerated gas and perform secondary adsorption treatment;
the method specifically comprises the following steps:
step 1: the first adsorption tank performs an intermittent adsorption flow of adsorption operation;
a1: when the sweeping gas is treated, an air inlet switch valve is opened, a first air inlet cut-off valve and a first oil gas discharge switch valve are opened, the rest valves are closed, the sweeping gas enters a first adsorption tank, and the sweeping gas is adsorbed by the first adsorption tank;
a2: when the process of sweeping the cabin gas is finished and the first adsorption tank is not saturated, all valves are closed, and the steps a 1-a 2 are repeated after waiting for the next oil unloading of the train tank wagon;
otherwise, a3 is carried out;
a3: when the treatment of the sweeping gas is finished and the first adsorption tank is saturated, starting the concentrated desorption condensation recovery flow in the step 5; otherwise, a4:
a4: when the sweeping gas needs to be treated and the first adsorption tank is saturated in adsorption, starting an adsorption condensation flow in the step 2;
step 2: the first adsorption tank performs desorption operation, and the second adsorption tank performs adsorption condensation flow of desorption operation;
the air inlet switch valve keeps an open state, the second air inlet cut-off valve, the second oil gas discharge switch valve, the first vacuumizing cut-off valve, the first back-blowing switch valve, the second cut-off valve and the second adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the sweeping gas enters a second adsorption tank, and the second adsorption tank adsorbs the sweeping gas;
the first adsorption tank carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and residual oil gas at an outlet of the condensation recovery flow enters a second adsorption tank for secondary adsorption treatment;
after the desorption of the first adsorption tank is finished, the vacuum pump is closed, and the step 3 is carried out:
step 3: the second adsorption tank performs an intermittent adsorption flow of adsorption operation;
b1: when the sweeping gas is treated, the air inlet switch valve is opened, the second air inlet cut-off valve and the second oil gas discharge switch valve are opened, the rest valves are closed, the sweeping gas enters the second adsorption tank, and the second adsorption tank adsorbs the sweeping gas;
b2: c, when the warehouse sweeping gas treatment is finished and the second adsorption tank is not saturated, closing all valves, and repeating the steps b 1-b 2 after waiting for the next oil unloading of the train tank wagon;
otherwise, b3 is carried out;
b3: when the treatment of the sweeping gas is finished and the adsorption of the second adsorption tank is saturated, starting the concentrated desorption condensation recovery flow in the step 6; otherwise, b4 is carried out;
b4: when the sweeping gas needs to be treated and the second adsorption tank is saturated in adsorption, starting an adsorption condensation flow in the step 4;
step 4: the second adsorption tank performs desorption operation, and the first adsorption tank performs adsorption condensation flow of desorption operation;
the air inlet switch valve keeps an open state, the first air inlet cut-off valve, the first oil gas discharge switch valve, the second vacuumizing cut-off valve, the second back-blowing switch valve, the second cut-off valve and the first adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the sweeping gas enters a first adsorption tank, and the first adsorption tank adsorbs the sweeping gas;
the second adsorption tank carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and residual oil gas at an outlet of the condensation recovery flow enters the first adsorption tank for secondary adsorption treatment;
after the desorption of the second adsorption tank is finished, the vacuum pump is closed, and the step 1 is carried out:
step 5: the first adsorption tank carries out a concentrated desorption condensation recovery flow of desorption operation;
the first vacuumizing cut-off valve, the first back-blowing switch valve, the first cut-off valve, the oil gas cooling condensation switch valve and the second adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the first adsorption tank is used for desorption, the desorbed regenerated gas enters a three-phase separator for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters a second adsorption tank for secondary adsorption treatment;
after the desorption of the first adsorption tank is finished, the vacuum pump is closed, and all valves are closed;
step 6: the second adsorption tank carries out concentrated desorption condensation recovery flow of desorption operation;
the second vacuumizing cut-off valve, the second back-blowing switch valve, the first cut-off valve, the oil gas cooling condensation switch valve and the first adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the second adsorption tank is used for desorption, the desorbed regenerated gas enters a three-phase separator for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters the first adsorption tank for secondary adsorption treatment;
after the desorption of the second adsorption tank is finished, the vacuum pump is closed, and all valves are closed;
step 7: condensing and recycling;
the incoming gas enters a heat exchanger for cooling and condensing and then enters a first-stage gas-liquid separation tank, a condensed oil phase is recycled to a three-phase separator through the first-stage gas-liquid separation tank, oil gas at a gas phase outlet of the first-stage gas-liquid separation tank enters an evaporator for further condensation, the condensed oil phase enters a second-stage gas-liquid separation tank, the condensed oil phase is recycled to the three-phase separator through the second-stage gas-liquid separation tank, and the oil gas at a gas phase outlet of the second-stage gas-liquid separation tank exchanges heat with the incoming gas in the heat exchanger and is discharged through a cold source outlet of the heat exchanger;
and the oil gas at the cold source outlet of the heat exchanger is the residual oil gas at the outlet of the condensation recovery flow.
The beneficial effects of the application are as follows:
(1) The application adopts the processes of intermittent adsorption flow, adsorption condensation flow and concentrated desorption condensation recovery flow to adsorb the small-gas-amount and intermittent discharged sweeping gas through the adsorption tank and then discharge the sweeping gas up to the standard, thereby reducing environmental pollution and meeting the discharge requirement;
(2) The application adopts the combined process of intermittent adsorption flow, adsorption condensation flow and concentrated desorption condensation recovery flow, can effectively reduce the equipment scale and the occupied area of the device, reduce the running time of the movable equipment and the fault risk of the device, and reduce the running power and the production cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic flow diagram of an oil and gas recovery system for train sweep gas treatment of the present application;
wherein:
101-a first adsorption tank, 102-a second adsorption tank;
201-a three-phase separator;
301-a primary gas-liquid separation tank, 302-a secondary gas-liquid separation tank;
401-a vacuum pump, 402-an oil pump;
501-a heat exchanger, 502-an evaporator;
601-a gas-liquid separator, 602-a compressor, 603-an oil separator, 604-an air cooler, 605-a refrigerant liquid storage tank;
701-inlet switch valve, 702-recovery oil switch valve, 703-sewage switch valve, 704-first inlet shut-off valve, 705-second inlet shut-off valve, 706-first vacuuming shut-off valve, 707-second vacuuming shut-off valve, 708-first adsorption switch valve, 709-second adsorption switch valve, 710-first oil gas discharge switch valve, 711-second oil gas discharge switch valve, 712-first back-blowing switch valve, 713-second back-blowing switch valve, 714-oil gas cooling condensation switch valve, 715-first shut-off valve, 716-second shut-off valve;
801-an oil phase liquid level monitor, 802-an aqueous phase liquid level monitor, 803-a first vacuumizing pressure monitor, 804-a second vacuumizing pressure monitor, 805-a differential pressure monitor, 806-an adsorption temperature monitor, 807-a heat source inlet temperature monitor, 808-a cold source outlet temperature monitor, 809-a heat source outlet temperature monitor, 810-an evaporator outlet temperature monitor, 811-an evaporator inlet refrigerant temperature monitor;
812-compressor inlet pressure monitoring instrument, 813-compressor outlet pressure monitoring instrument, 814-compressor outlet temperature monitoring instrument.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present application, the terms such as "upper", "lower", "bottom", "top", and the like refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely relational terms used for convenience in describing the structural relationships of the various components or elements of the present application, and are not meant to designate any one component or element of the present application, and are not to be construed as limiting the present application.
In the present application, terms such as "connected," "connected," and the like are to be construed broadly and mean either fixedly connected or integrally connected or detachably connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be determined according to circumstances by a person skilled in the relevant art or the art, and is not to be construed as limiting the present application.
The application will be further described with reference to the drawings and examples.
Example 1:
as shown in fig. 1, an oil gas recovery system for train sweeping gas treatment comprises a three-phase separator 201 and an adsorption tank group with two phase parallel adsorption tanks;
an inlet of the three-phase separator 201 is connected with a train sweeping gas collecting pipe, an oil phase outlet of the three-phase separator 201 is connected with an oil recovery device through a pipeline, a liquid phase outlet of the three-phase separator 201 is connected with a sewage pipe network, and a gas phase outlet of the three-phase separator 201 is connected with a bottom port of an adsorption tank group through a pipeline;
the gas phase outlet of the three-phase separator 201 is further connected with the heat source inlet of the heat exchanger 501 in a pipeline manner, the heat source outlet of the heat exchanger 501 is connected with the inlet of the primary gas-liquid separation tank 301 in a pipeline manner, the top outlet of the primary gas-liquid separation tank 301 is connected with the medium inlet of the evaporator 502, the medium outlet of the evaporator 502 is connected with the inlet of the secondary gas-liquid separation tank 302 in a pipeline manner, the top outlet of the secondary gas-liquid separation tank 302 is connected with the cold source inlet of the heat exchanger 501, and the cold source outlet of the heat exchanger 501 is connected with the bottom end port of the adsorption tank set;
the bottom outlets of the primary gas-liquid separation tank 301 and the secondary gas-liquid separation tank 302 are communicated with the three-phase separator 201;
the evaporator 502 is also connected to a refrigeration system;
the bottom port of the adsorption tank group is provided with a vacuum pumping system, the vacuum pumping system comprises a vacuum pump 401, an inlet of the vacuum pump 401 is connected with the bottom port of the adsorption tank group in a pipeline manner, and an outlet of the vacuum pump 401 is connected with an inlet of the three-phase separator 201 and a heat source inlet of the heat exchanger 501 in a pipeline manner respectively.
Preferably, an air inlet switch valve 701 is arranged on a train sweeping bin air collecting pipe connected with the inlet of the three-phase separator 201;
an oil pump 402 is arranged on a pipeline between an oil phase outlet of the three-phase separator 201 and an oil recovery device, and a recovered oil switch valve 702 is arranged on an outlet pipeline of the oil pump 402;
the sewage pipe network is provided with a sewage switch valve 703.
Preferably, two adsorption tanks connected in parallel in the adsorption tank group are a first adsorption tank 101 and a second adsorption tank 102 respectively;
a first air inlet cut-off valve 704 is arranged on a pipeline between the first adsorption tank 101 and a gas phase outlet of the three-phase separator 201;
a second air inlet cut-off valve 705 is arranged on a pipeline between the second adsorption tank 102 and the gas phase outlet of the three-phase separator 201.
Preferably, a first vacuumizing cut-off valve 706 is arranged on a pipeline between the first adsorption tank 101 and the inlet of the vacuum pump 401; the top outlet of the first adsorption tank 101 is also connected with a first back-blowing pipeline, and a first back-blowing switch valve 712 is arranged on the first back-blowing pipeline;
a second vacuumizing cut-off valve 707 is arranged on a pipeline between the second adsorption tank 102 and the vacuum pump 401; the top outlet of the second adsorption tank 102 is also connected with a second back-blowing pipeline, and a second back-blowing switch valve 713 is arranged on the second back-blowing pipeline;
a first shut-off valve 715 is arranged on a pipeline between the outlet of the vacuum pump 401 and the inlet of the three-phase separator 201;
a second shut-off valve 716 is arranged on a pipeline between the outlet of the vacuum pump 401 and the heat source inlet of the heat exchanger 501;
an oil-gas cooling condensation switch valve 714 is arranged on a pipeline between the gas phase outlet of the three-phase separator 201 and the heat source inlet of the heat exchanger 501;
a first adsorption switch valve 708 is arranged on a pipeline between the cold source outlet of the heat exchanger 501 and the bottom port of the first adsorption tank 101;
a second adsorption switch valve 709 is arranged on a pipeline between the cold source outlet of the heat exchanger 501 and the bottom port of the second adsorption tank 102.
Preferably, a first oil gas discharge switch valve 710 is disposed on a top outlet discharge line of the first adsorption tank 101;
a second oil gas discharge switch valve 711 is provided on the top outlet discharge line of the second canister 102.
Preferably, the three-phase separator 201 is provided with an oil phase liquid level monitor 801 for monitoring the oil phase liquid level and an aqueous phase liquid level monitor 802 for monitoring the aqueous phase liquid level.
Preferably, a first vacuumizing pressure monitoring instrument 803 for monitoring the vacuum degree in the first adsorption tank 101 is arranged on a pipeline between the first adsorption tank 101 and the vacuum pump 401;
a second vacuumizing pressure monitoring instrument 804 for monitoring the vacuum degree in the second adsorption tank 102 is arranged on a pipeline between the second adsorption tank 102 and the vacuum pump 401;
the first adsorption tank 101 and the second adsorption tank 102 are respectively provided with an adsorption temperature monitoring instrument 806 for monitoring the adsorption temperature inside the corresponding adsorption tank.
Preferably, a heat source inlet temperature monitoring instrument 807 is arranged on a heat source inlet pipeline of the heat exchanger 501;
a cold source outlet temperature monitoring instrument 808 is arranged on a cold source outlet pipeline of the heat exchanger 501;
a heat source outlet temperature monitoring instrument 809 is arranged on a heat source outlet pipeline of the heat exchanger 501;
an evaporator outlet temperature monitoring instrument 810 is arranged on a medium outlet pipeline of the evaporator 502.
Wherein the heat source inlet temperature monitoring instrument 807 is used for monitoring the temperature of the regenerated oil gas after desorption of the adsorption tank set when the regenerated oil gas enters the heat exchanger 501;
the cold source outlet temperature monitoring instrument 808 is used for monitoring the temperature of the oil gas which enters the adsorption tank group for secondary adsorption when the oil gas exits the heat exchanger 501;
the heat source outlet temperature monitoring instrument 809 is used for monitoring the temperature of the regenerated oil gas after the desorption of the adsorption tank set when the regenerated oil gas exits the heat exchanger 501;
evaporator outlet temperature monitoring meter 810 is used to monitor the temperature of the oil and gas after it has been cooled by the evaporator.
Specifically, a differential pressure detecting instrument 805 for monitoring differential pressure is disposed between the heat source inlet and the heat sink outlet of the heat exchanger 501.
Preferably, the refrigeration system comprises a gas-liquid separator 601, a compressor 602, an oil separator 603, an air cooler 604 and a refrigerant liquid storage tank 605;
the gas phase outlet of the gas-liquid separator 601 is connected with the inlet of the compressor 602 through a pipeline, the outlet of the compressor 602 is connected with the inlet of the oil separator 603 through a pipeline, the gas phase outlet of the oil separator 603 is connected with the inlet of the air cooler 604 through a pipeline, the outlet of the air cooler 604 is connected with the inlet of the refrigerant liquid storage tank 605 through a pipeline, the outlet of the refrigerant liquid storage tank 605 is connected with the refrigerant inlet of the evaporator 502 through a pipeline, and the refrigerant outlet of the evaporator 502 is connected with the inlet of the gas-liquid separator 601 through a pipeline.
Specifically, a filter is provided in the conduit between the outlet of the refrigerant reservoir 605 and the refrigerant inlet of the evaporator 502.
A compressor inlet pressure monitoring instrument 812 is arranged on an inlet pipeline of the compressor 602, and a compressor outlet pressure monitoring instrument 813 and a compressor outlet temperature monitoring instrument 814 are arranged on an outlet pipeline of the compressor 602;
an evaporator inlet refrigerant temperature monitoring instrument 811 is provided on the refrigerant inlet line of the evaporator 502.
Example 2:
an oil gas recovery method for train sweeping gas treatment is implemented by adopting the oil gas recovery system for train sweeping gas treatment in the embodiment 1, and comprises an intermittent adsorption flow, an adsorption condensation flow and a concentrated desorption condensation recovery flow;
when the sweeping gas needs to be treated and both the adsorption tanks are not saturated, starting an intermittent adsorption process to adsorb the sweeping gas;
when the sweeping gas needs to be treated and one of the adsorption tanks is saturated in adsorption, starting an adsorption condensation process to perform adsorption treatment on the sweeping gas, and performing condensation recovery and secondary adsorption treatment on the desorption regenerated gas;
when the treatment of the bin sweeping gas is finished and one of the adsorption tanks is saturated in adsorption, starting a concentrated desorption condensation recovery process to pre-separate, condense and recover desorption regenerated gas and perform secondary adsorption treatment;
the method specifically comprises the following steps:
step 1: the first adsorption tank 101 performs an intermittent adsorption process of the adsorption operation;
a1: when the sweeping gas is treated, the air inlet switch valve 701 is opened, the first air inlet cut-off valve 704 and the first oil gas discharge switch valve 710 are opened, the rest valves are closed, the sweeping gas enters the first adsorption tank 101, and the first adsorption tank 101 adsorbs the sweeping gas;
a2: when the process of sweeping the cabin gas is finished and the first adsorption tank 101 is not saturated, all valves are closed, and the steps a 1-a 2 are repeated after waiting for the next oil unloading of the train tank wagon; so as to perform intermittent adsorption of the sweeping gas according to the characteristics of small gas quantity and intermittent discharge of the sweeping gas;
otherwise, a3 is carried out;
a3: when the treatment of the sweeping gas is finished and the first adsorption tank 101 is saturated, starting the concentrated desorption condensation recovery process in the step 5; otherwise, a4:
a4: when the sweeping gas needs to be treated and the first adsorption tank 101 is saturated in adsorption, starting an adsorption condensation flow in the step 2;
step 2: an adsorption condensation flow in which the first adsorption tank 101 performs desorption operation and the second adsorption tank 102 performs desorption operation;
the air inlet switch valve 701 keeps an open state, the second air inlet cut-off valve 705, the second oil gas discharge switch valve 711, the first vacuumizing cut-off valve 706, the first back-blowing switch valve 712, the second cut-off valve 716 and the second adsorption switch valve 709 are opened, the rest valves are closed, and the vacuum pump 404 is started;
the sweeping gas enters a second adsorption tank 102, and the second adsorption tank 102 adsorbs the sweeping gas;
the first adsorption tank 101 carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters the second adsorption tank 102 for secondary adsorption treatment;
after the desorption of the first adsorption tank 101 is completed, the vacuum pump 404 is turned off, and step 3 is performed:
step 3: the second adsorption tank 102 performs an intermittent adsorption process of the adsorption operation;
b1: when the sweeping gas is treated, the air inlet switch valve 701 is opened, the second air inlet cut-off valve 705 and the second oil gas discharge switch valve 711 are opened, the rest valves are closed, the sweeping gas enters the second adsorption tank 102, and the second adsorption tank 102 adsorbs the sweeping gas;
b2: b 1-b 2 are repeated after all valves are closed and waiting for the next oil unloading of the train tank wagon when the sweeping gas is treated and the second adsorption tank 102 is not saturated; so as to perform intermittent adsorption of the sweeping gas according to the characteristics of small gas quantity and intermittent discharge of the sweeping gas;
when the sweeping gas is treated and the second adsorption tank 102 is saturated in adsorption, starting the concentrated desorption condensation recovery process in the step 6;
when the sweeping gas needs to be treated and the second adsorption tank 102 is saturated in adsorption, starting an adsorption condensation flow in the step 4;
step 4: the second adsorption tank 102 performs desorption operation, and the first adsorption tank 101 performs adsorption condensation flow of desorption operation;
the air inlet switch valve 701 keeps an open state, the first air inlet cut-off valve 704, the first oil gas discharge cut-off valve 710, the second vacuumizing cut-off valve 707, the second back-blowing cut-off valve 713, the second cut-off valve 716 and the first adsorption cut-off valve 708 are opened, the rest valves are closed, and the vacuum pump 404 is started;
the sweeping gas enters a first adsorption tank 101, and the first adsorption tank 101 adsorbs the sweeping gas;
the second adsorption tank 102 carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters the first adsorption tank 101 for secondary adsorption treatment;
after the desorption of the second adsorption tank 102 is completed, the vacuum pump 404 is turned off, and step 1 is performed:
step 5: the first adsorption tank 101 performs a concentrated desorption condensation recovery process of desorption operation;
the first vacuumizing cut-off valve 706, the first back-blowing switch valve 712, the first cut-off valve 715, the oil gas cooling condensation switch valve 714 and the second adsorption switch valve 709 are opened, the rest valves are closed, and the vacuum pump 404 is started;
the first adsorption tank 101 carries out desorption, the desorbed regenerated gas enters a three-phase separator 201 for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters a second adsorption tank 102 for secondary adsorption treatment;
after the desorption of the first adsorption tank 101 is completed, the vacuum pump 404 is closed, and all valves are closed;
step 6: the second adsorption tank 102 performs a concentrated desorption condensation recovery process of desorption operation;
the second vacuumizing cut-off valve 707, the second back-blowing switch valve 713, the first cut-off valve 715, the oil gas cooling condensation switch valve 714 and the first adsorption switch valve 708 are opened, the rest valves are closed, and the vacuum pump 404 is started;
the second adsorption tank 102 carries out desorption, the desorbed regenerated gas enters a three-phase separator 201 for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters the first adsorption tank 101 for secondary adsorption treatment;
after the desorption of the second adsorption tank 101 is completed, the vacuum pump 404 is closed, and all valves are closed;
step 7: condensing and recycling;
the incoming gas enters a heat exchanger 501 for cooling and condensation and then enters a first-stage gas-liquid separation tank 301, the condensed oil phase is recycled to a three-phase separator 201 through the first-stage gas-liquid separation tank 301, the oil gas at the gas phase outlet of the first-stage gas-liquid separation tank 301 enters an evaporator 502 for further condensation, the condensed oil phase enters a second-stage gas-liquid separation tank 302, the condensed oil phase is recycled to the three-phase separator 201 through the second-stage gas-liquid separation tank 301, and the oil gas at the gas phase outlet of the second-stage gas-liquid separation tank 302 exchanges heat with the incoming gas in the heat exchanger 501 and is discharged through the cold source outlet of the heat exchanger 501;
the oil gas at the cold source outlet of the heat exchanger 501 is the residual oil gas at the outlet of the condensation recovery flow.
The application adopts the processes of intermittent adsorption flow, adsorption condensation flow and concentrated desorption condensation recovery flow to adsorb the small-gas-amount and intermittent discharged sweeping gas through the adsorption tank and then discharge the sweeping gas up to the standard, thereby reducing environmental pollution and meeting the discharge requirement;
the combined process of the intermittent adsorption flow, the adsorption condensation flow and the concentrated desorption condensation recovery flow can effectively reduce the equipment scale and the occupied area of the device, reduce the running time of the movable equipment and the fault risk of the device, and reduce the running power and the production cost.
While the foregoing is directed to embodiments of the present application, other and further embodiments of the application may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (10)
1. An oil gas recovery system for train sweeping gas treatment comprises a three-phase separator and an adsorption tank group with two parallel adsorption tanks; it is characterized in that the method comprises the steps of,
the inlet of the three-phase separator is connected with a train sweeping gas collecting pipe, the oil phase outlet of the three-phase separator is connected with the oil recovery device through a pipeline, the liquid phase outlet of the three-phase separator is connected with a sewage pipe network, and the gas phase outlet of the three-phase separator is connected with the bottom port of the adsorption tank group through a pipeline;
the gas phase outlet of the three-phase separator is also connected with the heat source inlet of the heat exchanger through a pipeline, the heat source outlet of the heat exchanger is connected with the inlet of the primary gas-liquid separation tank through a pipeline, the top outlet of the primary gas-liquid separation tank is connected with the medium inlet of the evaporator, the medium outlet of the evaporator is connected with the inlet of the secondary gas-liquid separation tank through a pipeline, the top outlet of the secondary gas-liquid separation tank is connected with the cold source inlet of the heat exchanger, and the cold source outlet of the heat exchanger is connected with the bottom end port of the adsorption tank group;
the bottom outlets of the primary gas-liquid separation tank and the secondary gas-liquid separation tank are communicated with a three-phase separator;
the evaporator is also connected with a refrigerating system;
the bottom port of the adsorption tank group is provided with a vacuumizing system, the vacuumizing system comprises a vacuum pump, an inlet of the vacuum pump is connected with the bottom port of the adsorption tank group through a pipeline, and an outlet of the vacuum pump is connected with an inlet of the three-phase separator and a heat source inlet of the heat exchanger through pipelines respectively.
2. The oil gas recovery system for train sweeping gas treatment according to claim 1, wherein an air inlet switch valve is arranged on a train sweeping gas collecting pipe connected with an inlet of the three-phase separator;
an oil pump is arranged on a pipeline between an oil phase outlet of the three-phase separator and the oil recovery device, and a recovery oil switch valve is arranged on an outlet pipeline of the oil pump;
and a sewage switch valve is arranged on the sewage pipe network.
3. The oil gas recovery system for train sweeping gas treatment according to claim 2, wherein two adsorption tanks connected in parallel in the adsorption tank group are a first adsorption tank and a second adsorption tank respectively;
a first air inlet cut-off valve is arranged on a pipeline between the first adsorption tank and a gas phase outlet of the three-phase separator;
and a second air inlet cut-off valve is arranged on a pipeline between the second adsorption tank and the gas phase outlet of the three-phase separator.
4. The oil gas recovery system for train sweeping gas treatment according to claim 3, wherein a first vacuumizing cut-off valve is arranged on a pipeline between the first adsorption tank and the inlet of the vacuum pump; the top outlet of the first adsorption tank is also connected with a first back-blowing pipeline, and a first back-blowing switch valve is arranged on the first back-blowing pipeline;
a second vacuumizing cut-off valve is arranged on a pipeline between the second adsorption tank and the vacuum pump; the top outlet of the second adsorption tank is also connected with a second back-blowing pipeline, and a second back-blowing switch valve is arranged on the second back-blowing pipeline;
a first cut-off valve is arranged on a pipeline between the outlet of the vacuum pump and the inlet of the three-phase separator;
a second shut-off valve is arranged on a pipeline between the outlet of the vacuum pump and the heat source inlet of the heat exchanger;
an oil gas cooling condensation switch valve is arranged on a pipeline between a gas phase outlet of the three-phase separator and a heat source inlet of the heat exchanger;
a first adsorption switch valve is arranged on a pipeline between the heat exchanger cold source outlet and the bottom port of the first adsorption tank;
and a second adsorption switch valve is arranged on a pipeline between the heat exchanger cold source outlet and the bottom port of the second adsorption tank.
5. The oil and gas recovery system for train sweeping gas treatment according to claim 4, wherein a first oil and gas discharge on-off valve is provided on a top outlet discharge line of the first adsorption tank;
and a second oil gas discharge switch valve is arranged on a top outlet discharge pipeline of the second adsorption tank.
6. The oil gas recovery system for train sweeping gas treatment according to claim 1, wherein the three-phase separator is provided with an oil phase liquid level monitoring instrument for monitoring the liquid level of the oil phase and an aqueous phase liquid level monitoring instrument for monitoring the liquid level of the aqueous phase.
7. The oil gas recovery system for train sweeping gas treatment according to claim 3, wherein a first vacuumizing pressure monitoring instrument for monitoring the vacuum degree in the first adsorption tank is arranged on a pipeline between the first adsorption tank and the vacuum pump;
a second vacuumizing pressure monitoring instrument for monitoring the vacuum degree in the second adsorption tank is arranged on a pipeline between the second adsorption tank and the vacuum pump;
and the first adsorption tank and the second adsorption tank are respectively provided with an adsorption temperature monitoring instrument for monitoring the adsorption temperature inside the corresponding adsorption tank.
8. The oil gas recovery system for train sweeping gas treatment according to claim 1, wherein a heat source inlet temperature monitoring instrument is arranged on a heat source inlet pipeline of the heat exchanger;
a cold source outlet temperature monitoring instrument is arranged on a cold source outlet pipeline of the heat exchanger;
a heat source outlet temperature monitoring instrument is arranged on a heat source outlet pipeline of the heat exchanger;
an evaporator outlet temperature monitoring instrument is arranged on a medium outlet pipeline of the evaporator.
9. The oil and gas recovery system for train sweeping gas treatment of claim 1, wherein the refrigeration system comprises a gas-liquid separator, a compressor, an oil separator, an air cooler, and a refrigerant liquid storage tank;
the gas phase outlet of the gas-liquid separator is connected with the inlet of the compressor through a pipeline, the outlet of the compressor is connected with the inlet of the oil separator through a pipeline, the gas phase outlet of the oil separator is connected with the inlet of the air cooler through a pipeline, the outlet of the air cooler is connected with the inlet of the refrigerant liquid storage tank through a pipeline, the outlet of the refrigerant liquid storage tank is connected with the refrigerant inlet of the evaporator through a pipeline, and the refrigerant outlet of the evaporator is connected with the inlet of the gas-liquid separator through a pipeline.
10. An oil gas recovery method for train sweeping gas treatment, which is characterized in that the oil gas recovery system for train sweeping gas treatment is implemented by adopting the method for train sweeping gas treatment according to any one of claims 5-9, and comprises an intermittent adsorption flow, an adsorption condensation flow and a concentrated desorption condensation recovery flow;
when the sweeping gas needs to be treated and both the adsorption tanks are not saturated, starting an intermittent adsorption process to adsorb the sweeping gas;
when the sweeping gas needs to be treated and one of the adsorption tanks is saturated in adsorption, starting an adsorption condensation process to perform adsorption treatment on the sweeping gas, and performing condensation recovery and secondary adsorption treatment on the desorption regenerated gas;
when the treatment of the bin sweeping gas is finished and one of the adsorption tanks is saturated in adsorption, starting a concentrated desorption condensation recovery process to pre-separate, condense and recover desorption regenerated gas and perform secondary adsorption treatment;
the method specifically comprises the following steps:
step 1: the first adsorption tank performs an intermittent adsorption flow of adsorption operation;
a1: when the sweeping gas is treated, an air inlet switch valve is opened, a first air inlet cut-off valve and a first oil gas discharge switch valve are opened, the rest valves are closed, the sweeping gas enters a first adsorption tank, and the sweeping gas is adsorbed by the first adsorption tank;
a2: when the process of sweeping the cabin gas is finished and the first adsorption tank is not saturated, all valves are closed, and the steps a 1-a 2 are repeated after waiting for the next oil unloading of the train tank wagon;
otherwise, a3 is carried out;
a3: when the treatment of the sweeping gas is finished and the first adsorption tank is saturated, starting the concentrated desorption condensation recovery flow in the step 5; otherwise, a4:
a4: when the sweeping gas needs to be treated and the first adsorption tank is saturated in adsorption, starting an adsorption condensation flow in the step 2;
step 2: the first adsorption tank performs desorption operation, and the second adsorption tank performs adsorption condensation flow of desorption operation;
the air inlet switch valve keeps an open state, the second air inlet cut-off valve, the second oil gas discharge switch valve, the first vacuumizing cut-off valve, the first back-blowing switch valve, the second cut-off valve and the second adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the sweeping gas enters a second adsorption tank, and the second adsorption tank adsorbs the sweeping gas;
the first adsorption tank carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and residual oil gas at an outlet of the condensation recovery flow enters a second adsorption tank for secondary adsorption treatment;
after the desorption of the first adsorption tank is finished, the vacuum pump is closed, and the step 3 is carried out:
step 3: the second adsorption tank performs an intermittent adsorption flow of adsorption operation;
b1: when the sweeping gas is treated, the air inlet switch valve is opened, the second air inlet cut-off valve and the second oil gas discharge switch valve are opened, the rest valves are closed, the sweeping gas enters the second adsorption tank, and the second adsorption tank adsorbs the sweeping gas;
b2: c, when the warehouse sweeping gas treatment is finished and the second adsorption tank is not saturated, closing all valves, and repeating the steps b 1-b 2 after waiting for the next oil unloading of the train tank wagon;
otherwise, b3 is carried out;
b3: when the treatment of the sweeping gas is finished and the adsorption of the second adsorption tank is saturated, starting the concentrated desorption condensation recovery flow in the step 6; otherwise, b4 is carried out;
b4: when the sweeping gas needs to be treated and the second adsorption tank is saturated in adsorption, starting an adsorption condensation flow in the step 4;
step 4: the second adsorption tank performs desorption operation, and the first adsorption tank performs adsorption condensation flow of desorption operation;
the air inlet switch valve keeps an open state, the first air inlet cut-off valve, the first oil gas discharge switch valve, the second vacuumizing cut-off valve, the second back-blowing switch valve, the second cut-off valve and the first adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the sweeping gas enters a first adsorption tank, and the first adsorption tank adsorbs the sweeping gas;
the second adsorption tank carries out desorption, the desorbed regenerated gas enters a condensation recovery flow in the step 7, and residual oil gas at an outlet of the condensation recovery flow enters the first adsorption tank for secondary adsorption treatment;
after the desorption of the second adsorption tank is finished, the vacuum pump is closed, and the step 1 is carried out:
step 5: the first adsorption tank carries out a concentrated desorption condensation recovery flow of desorption operation;
the first vacuumizing cut-off valve, the first back-blowing switch valve, the first cut-off valve, the oil gas cooling condensation switch valve and the second adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the first adsorption tank is used for desorption, the desorbed regenerated gas enters a three-phase separator for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters a second adsorption tank for secondary adsorption treatment;
after the desorption of the first adsorption tank is finished, the vacuum pump is closed, and all valves are closed;
step 6: the second adsorption tank carries out concentrated desorption condensation recovery flow of desorption operation;
the second vacuumizing cut-off valve, the second back-blowing switch valve, the first cut-off valve, the oil gas cooling condensation switch valve and the first adsorption switch valve are opened, the rest valves are closed, and the vacuum pump is started;
the second adsorption tank is used for desorption, the desorbed regenerated gas enters a three-phase separator for pre-separation, the separated oil gas enters a condensation recovery flow in the step 7, and the residual oil gas at the outlet of the condensation recovery flow enters the first adsorption tank for secondary adsorption treatment;
after the desorption of the second adsorption tank is finished, the vacuum pump is closed, and all valves are closed;
step 7: condensing and recycling;
the incoming gas enters a heat exchanger for cooling and condensing and then enters a first-stage gas-liquid separation tank, a condensed oil phase is recycled to a three-phase separator through the first-stage gas-liquid separation tank, oil gas at a gas phase outlet of the first-stage gas-liquid separation tank enters an evaporator for further condensation, the condensed oil phase enters a second-stage gas-liquid separation tank, the condensed oil phase is recycled to the three-phase separator through the second-stage gas-liquid separation tank, and the oil gas at a gas phase outlet of the second-stage gas-liquid separation tank exchanges heat with the incoming gas in the heat exchanger and is discharged through a cold source outlet of the heat exchanger;
and the oil gas at the cold source outlet of the heat exchanger is the residual oil gas at the outlet of the condensation recovery flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310912335.XA CN116808773A (en) | 2023-07-25 | 2023-07-25 | Oil gas recovery system and method for train warehouse sweeping gas treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310912335.XA CN116808773A (en) | 2023-07-25 | 2023-07-25 | Oil gas recovery system and method for train warehouse sweeping gas treatment |
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