CN113996615A - LPG-related tank car cleaning device and method based on pressure swing adsorption technology - Google Patents
LPG-related tank car cleaning device and method based on pressure swing adsorption technology Download PDFInfo
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- 238000001179 sorption measurement Methods 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004140 cleaning Methods 0.000 title claims abstract description 27
- 238000005516 engineering process Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 50
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000003795 desorption Methods 0.000 claims abstract description 18
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 6
- 230000006837 decompression Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 239000012855 volatile organic compound Substances 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 238000010926 purge Methods 0.000 claims description 18
- 239000003463 adsorbent Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 10
- 239000005416 organic matter Substances 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 2
- 239000000383 hazardous chemical Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000010408 sweeping Methods 0.000 abstract description 2
- 239000003915 liquefied petroleum gas Substances 0.000 description 30
- 239000012528 membrane Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 239000010815 organic waste Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- SAZUGELZHZOXHB-UHFFFAOYSA-N acecarbromal Chemical compound CCC(Br)(CC)C(=O)NC(=O)NC(C)=O SAZUGELZHZOXHB-UHFFFAOYSA-N 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0821—Handling or manipulating containers, e.g. moving or rotating containers in cleaning devices, conveying to or from cleaning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
-
- 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
Abstract
The invention discloses a cleaning device and a cleaning method for an LPG tank truck based on a pressure swing adsorption technology. The residual medium in the jar gets into the buffer tank along with nitrogen gas after sweeping, gets into the adsorption tower after the compressor compression again, and the organic matter realizes effectual separation under adsorption pressure, and purification tail gas after up to standard gets into first step and sweeps pipeline in cyclic utilization, if the tail gas that comes out from first adsorption tower is not up to standard, then gets into the second adsorption tower and adsorbs, carries out the decompression desorption to first adsorption tower simultaneously, and tail gas after the desorption gets into the raffinate jar and carries out recycle. The invention can realize the waterless cleaning of the tank truck, reduce the emission of harmful gas, recover the residual oil medium which is difficult to treat in the LPG vehicle, save energy and protect environment; meanwhile, the device has the advantages of low equipment investment, simplicity in operation and long operation time, and is particularly suitable for LPG tank car detection units or hazardous chemical substance parking lots.
Description
Technical Field
The invention relates to a cleaning device and a cleaning method for an LPG tank truck, in particular to a cleaning device and a cleaning method for an LPG tank truck based on a pressure swing adsorption technology.
Background
The LPG tank car is a special transportation tool for transporting liquefied petroleum gas, belonging to a movable pressure container, the storage tank of the LPG tank car is a pressure-bearing container for transporting inflammable and explosive media, the safety inspection and the periodic inspection of the LPG tank car are definitely specified in the national regulation standard, the cleaning of the LPG tank car is a necessary premise before the safety inspection and the periodic inspection, and under the condition that the national increasingly attaches importance to safety and environmental protection, the cleaning of the LPG tank car is always a fundamental problem which troubles the industry for many years at present.
Most of LPG tank trucks are cleaned by using a mode of carrying out combustion treatment on gas after air replacement or inert gas replacement after hot water soaking, wherein a large amount of oily wastewater and organic waste gas are generated in the hot water soaking process, so that the surrounding environment is seriously polluted, and the mode of carrying out combustion treatment after gas replacement wastes resources and needs to be connected into a tail gas treatment device of a large-scale factory by laying a pipeline.
The common VOCs treatment and recovery methods are classified into two types, one is a destructive method, and the other is mainly an incineration method, a catalytic method, a biological method and the like. The incineration method can efficiently convert organic waste gas into carbon dioxide and water, but the method relates to open fire use, has limited application scenes, cannot recover organic matters, and has no economic benefit. The catalytic method is to convert organic waste gas into CO2 and H2O by means of a catalyst in a temperature range of 200-300 ℃, and is only suitable for occasions with small air quantity and low concentration at present and generally used as a terminal unit in a combined process from the viewpoint of safety. The other is a non-destructive method, mainly a condensation method, an adsorption method, a membrane separation method, or the like, or a combination of the above methods.
Chinese patent CN20201530478.2 discloses a cleaning system of a tank wagon by a preferential organic membrane permeation method, which comprises an inert gas purging system, a compression condensing device, an organic membrane separation device and an oxidation device. The nitrogen conveying pipeline is connected to a tank truck through a compressor and a gas heater, an outlet of the tank truck is connected to a condenser, an outlet of the condenser is connected to a liquid storage tank and preferentially penetrates through an organic membrane group, condensate obtained by the condenser is collected by the liquid storage tank, non-condensable gas is input and preferentially penetrates through the organic membrane group, a surplus side preferentially penetrating through the organic membrane group is connected to the front end of the compressor, input lean gas and nitrogen are recycled, and a penetration side is connected to the condenser for recycling. The method provides a possibility for cleaning the oil tank truck, but the method needs heating and condensing firstly, so that the energy consumption is high; the condensation method and the membrane separation method are combined for application, so that the equipment is complex; the separation method has large equipment investment, high price, short membrane service life, high operation requirement and the requirement for stable pressure and stable flow of a separation device. Cleaning of LPG tankers is not an economical and efficient cleaning method.
Disclosure of Invention
The invention aims to solve the technical problem of providing the LPG-involved tank car cleaning device based on the pressure swing adsorption technology, which can realize the waterless cleaning of the tank car, reduce the emission of harmful gas, recover the residual oil medium which is difficult to treat in the LPG car, save energy and protect environment; meanwhile, the process equipment has the advantages of low investment, simple operation and long operation time, and is particularly suitable for LPG tank car detection units or hazardous chemical substance parking lots.
In order to solve the technical problem, the cleaning device of the LPG-related tank car based on the pressure swing adsorption technology comprises a liquid nitrogen tank, a buffer tank, two adsorption towers, a residual liquid tank, a purging spray head, purging program control and interlocking control, wherein the liquid nitrogen tank is connected with an inlet of the LPG-related tank car through an eighth electromagnetic valve and a blower through pipelines, the eighth electromagnetic valve and the blower are respectively connected with outlets of the first adsorption tower and the second adsorption tower through pipelines, outlet pipes of the first adsorption tower and the second adsorption tower are correspondingly provided with a sixth electromagnetic valve, a first VOCs concentration online detector, a seventh electromagnetic valve and a second VOCs concentration online detector, and the sixth electromagnetic valve, the first VOCs concentration online detector, the seventh electromagnetic valve and the second VOCs concentration online detector are respectively connected through pipelines; the inlet of the first adsorption tower and the inlet of the second adsorption tower are correspondingly connected with a residual liquid tank pipeline through a second electromagnetic valve and a fourth electromagnetic valve, a first pressure gauge and a vacuum pump are installed on the residual liquid tank, the other inlet of the first adsorption tower and the inlet of the second adsorption tower are correspondingly connected with an outlet pipeline of the buffer tank through the first electromagnetic valve and the third electromagnetic valve, a second pressure gauge, a compressor and a ninth electromagnetic valve are installed on the outlet pipeline of the buffer tank, and the inlet of the buffer tank is connected with an outlet pipeline of the LPG tank truck through a tenth electromagnetic valve, a third VOCs concentration online detector and an eleventh electromagnetic valve.
The invention also provides a method for cleaning the LPG-related tank truck based on the pressure swing adsorption technology, which comprises the following steps:
the first step is a nitrogen purge step; nitrogen in the liquid nitrogen tank enters the LPG tank car through the fan to be fully purged, the purged gas enters the buffer tank, the online monitoring is carried out by a third VOCs concentration online detector in the LPG tank car, the detection of the VOCs component is less than 0.2%, and the purging can be stopped;
the second step is pressure swing adsorption recovery; pressurizing the gas in the buffer tank in the first step to 0.1MPa through a compressor, then opening a first electromagnetic valve and a sixth electromagnetic valve on a first adsorption tower, closing a second electromagnetic valve, a third electromagnetic valve and a fifth electromagnetic valve, enabling the tail gas to pass through an activated carbon adsorbent laid in the first adsorption tower from bottom to top, adsorbing the organic matters by the adsorbent in the first adsorption tower, keeping the organic matters in the adsorbent, realizing effective separation of the organic matters under adsorption pressure, purifying the tail gas, and discharging the organic matters in the exhaust gas to enter a purging system in the first step for cyclic utilization, wherein the organic matters in the exhaust gas are lower than the specified discharge requirement; after the first adsorption tower works for a period of time, the first VOCs concentration on an outlet pipe of the first adsorption tower is detected by an online detector, if the content of organic matters in the exhaust gas is higher than 0.2%, the first electromagnetic valve, the fourth electromagnetic valve and the sixth electromagnetic valve are closed, the second electromagnetic valve, the third electromagnetic valve and the seventh electromagnetic valve are opened, the second adsorption tower is used for adsorption, a vacuum pump behind a residual liquid tank is simultaneously opened to perform reduced pressure desorption on the first adsorption tower, the organic matters in the desorption equipment enter the residual liquid tank, after the desorption pressure is reduced to 10 +/-1 Pa, the fifth electromagnetic valve is opened, the pressure of the first adsorption tower is adjusted to be slightly positive pressure, the fifth electromagnetic valve is closed again until all desorption works are completed, and the first adsorption tower and the second adsorption tower simultaneously and cyclically reciprocate.
The first step of the invention is a nitrogen purging subsystem, which comprises a purging spray head, VOCs concentration online monitoring, a nitrogen storage tank, purging program control, interlocking control and the like. The nitrogen of the nitrogen storage tank passes through the fan through the blowing program control, the LPG tank car is blown through the blowing nozzle, the VOCs concentration online detector is used for controlling the blowing program, the subsystem can obviously reduce the concentration of VOCs media in the LPG tank in a short time, and the personnel can be ensured to enter the tank for safe operation.
The second step is a waste gas recycling subsystem, which comprises a buffer tank and a double-tower pressure swing adsorption device. The residual medium in the jar gets into the buffer tank along with nitrogen gas after sweeping, get into adsorption tower 1 after the compressor compression again, the organic matter can realize effectual separation under adsorption pressure, after the tail gas purification, organic matter content is less than the regulation and discharges the requirement in the exhaust gas, gas discharges from the blast pipe, purification tail gas after up to standard gets into first step and sweeps pipeline in cyclic utilization, the adsorbent uses a period, after having adsorbed a certain amount of organic matter, if the tail gas that comes out from first adsorption tower is not up to standard, then get into the second adsorption tower and adsorb, carry out the decompression desorption to first adsorption tower simultaneously, tail gas after the desorption gets into the raffinate jar and carries out recycle.
The tail gas of the LPG tank truck has simple and definite components, low boiling point, low concentration and intermittent operation of the cleaning process, and the tail gas is separated and recovered only on the basis of full purging and replacement, so that the tail gas reaches the standard and is discharged only to the difficulty of the process. The Pressure Swing Adsorption (PSA) technology is a novel gas separation and purification technology which is rapidly developed in recent years, and is widely applied to gas separation processes in the petrochemical industry due to the fact that the PSA technology is low in investment, low in operating cost, high in purity, simple and flexible to operate and low in environmental pollution.
The pressure swing adsorption operation is considered as an isothermal process because the thermal conductivity of the adsorbent is small and the temperature change of the adsorbent bed caused by the heat of adsorption and desorption is not large, under the isothermal condition, the adsorption amount of the organic waste gas is increased along with the increase of the pressure and is reduced along with the reduction of the pressure, and simultaneously, the adsorbed gas is released in the decompression process to regenerate the adsorbent, and the adsorption regeneration can be carried out without heat supply from the outside. The pressure swing adsorption is generated based on the decompression and regeneration of the adsorbent, and is an operation process that the adsorbent carries out adsorption under high pressure and desorption under low pressure on the basis of the difference of the equilibrium adsorption quantity of different components in a gas mixture under different pressure conditions, thereby realizing the purpose of separating an exhaust gas mixture.
The invention relates to a simple, effective and quick green cleaning process developed for an LPG tank truck by utilizing the characteristics of a Pressure Swing Adsorption (PSA) technology. In the invention, the waste gas generated by cleaning the LPG tank truck is small (less than or equal to 100Nm3/h) and discontinuous, and the oily waste gas contains components below C4, and the cleaning treatment system adopts a process of nitrogen purging and double-tower pressure swing adsorption device in consideration of multiple dimensions such as equipment safety, stability, operation energy consumption, waste gas emission standard reaching performance and the like.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
Detailed Description
Referring to fig. 1, the LPG tanker cleaning device based on pressure swing adsorption technology of the present invention comprises a liquid nitrogen tank, a buffer tank, two adsorption towers, a residual liquid tank, a purging nozzle, a purging program control and an interlock control, wherein the liquid nitrogen tank 1 is connected with an inlet of an LPG tanker 4 through an eighth solenoid valve 2 and a blower 3 by a pipeline, the eighth solenoid valve 2 and the blower 3 are respectively connected with outlets of a first adsorption tower 5 and a second adsorption tower 6 by a pipeline, outlet pipes of the first adsorption tower 5 and the second adsorption tower 6 are correspondingly provided with a sixth solenoid valve 7, a first online detector 8 and a seventh solenoid valve 9 for concentration of VOCs, and a second online detector 10 for concentration of VOCs, which are respectively connected through a fifth solenoid valve 11 between the sixth solenoid valve 7 and the first online detector 8 for concentration of VOCs, between the seventh solenoid valve 9 and the second online detector 10 for concentration of VOCs; one path of the inlet of the first adsorption tower 5 and the inlet of the second adsorption tower 6 are correspondingly connected with a residual liquid tank 14 through a second electromagnetic valve 12 and a fourth electromagnetic valve 13, the residual liquid tank 14 is provided with a first pressure gauge 15 and a vacuum pump 16, the other path of the inlet of the first adsorption tower and the second adsorption tower is correspondingly connected with an outlet pipeline of a buffer tank 19 through a first electromagnetic valve 17 and a third electromagnetic valve 18, the outlet pipeline of the buffer tank 19 is provided with a second pressure gauge 20, a compressor 21 and a ninth electromagnetic valve 22, and the inlet of the buffer tank 19 is connected with an outlet pipeline of the LPG tank truck 4 through a tenth electromagnetic valve 23, a third VOCs concentration online detector 24 and an eleventh electromagnetic valve 25.
The method for cleaning the LPG-related tank truck based on the pressure swing adsorption technology comprises the following steps:
the first step is a nitrogen purge step; nitrogen in the liquid nitrogen tank 1 enters an LPG tank truck 4 through a fan 3 to be fully purged, the purged gas enters a buffer tank 19, online monitoring is carried out in the LPG tank truck 4 through a third VOCs concentration online detector 2, the content of VOCs is detected to be less than 0.2%, and purging can be stopped;
the second step is pressure swing adsorption recovery; after the gas in the buffer tank 19 in the first step is pressurized to 0.1MPa through the compressor 21, the first electromagnetic valve 17 and the sixth electromagnetic valve 7 on the first adsorption tower 5 are opened, the second electromagnetic valve 12, the third electromagnetic valve 13 and the fifth electromagnetic valve 11 are closed, the tail gas passes through the adsorbent laid in the first adsorption tower 5 from bottom to top, the active carbon adsorbent in the first adsorption tower 5 adsorbs the organic matters and remains in the adsorbent, the organic matters can be effectively separated under the adsorption pressure, after the tail gas is purified, the content of the organic matters in the exhaust gas is lower than the specified emission requirement, and the gas is discharged from the exhaust pipe and enters the purging system in the first step for cyclic utilization; after the first adsorption tower 5 works for a period of time, the first VOCs concentration on an outlet pipe of the first adsorption tower 5 is detected by an online detector 8, if the content of organic matters in exhaust gas is higher than 0.2%, a first electromagnetic valve 17, a fourth electromagnetic valve 13 and a sixth electromagnetic valve 7 are closed, a second electromagnetic valve 12, a third electromagnetic valve 18 and a seventh electromagnetic valve 9 are opened, adsorption is carried out through a second adsorption tower 6, a vacuum pump 16 after a residual liquid tank 14 is opened simultaneously to carry out pressure reduction and desorption on the first adsorption tower 5, the organic matters in the desorption equipment enter the residual liquid tank 14, after the desorption pressure is reduced to 10 +/-1 Pa, a fifth electromagnetic valve 11 is opened, the pressure of the first adsorption tower 5 is adjusted to micro positive pressure, the fifth electromagnetic valve 11 is closed again until all desorption works are completed, and the first adsorption tower 5 and the second adsorption tower 6 simultaneously and cyclically work.
Claims (2)
1. The utility model provides a relate to LPG tank car belt cleaning device based on pressure swing adsorption technique which characterized by: comprises a liquid nitrogen tank, a buffer tank, two adsorption towers, a residual liquid tank, a purging spray head, purging program control and interlocking control, the liquid nitrogen tank (1) is connected with an inlet of an LPG tank car (4) through a pipeline by an eighth electromagnetic valve (2) and a fan (3), a sixth electromagnetic valve (7), a first VOCs concentration online detector (8), a seventh electromagnetic valve (9) and a second VOCs concentration online detector (10) are correspondingly arranged on outlet pipes of the first adsorption tower (5) and the second adsorption tower (6), the sixth electromagnetic valve (7) is connected with the first VOCs concentration online detector (8), the seventh electromagnetic valve (9) is connected with the second VOCs concentration online detector (10) through a fifth electromagnetic valve (11) by pipelines; one path of the inlet of the first adsorption tower (5) and the inlet of the second adsorption tower (6) are correspondingly connected with a residual liquid tank (14) through a second electromagnetic valve (12) and a fourth electromagnetic valve (13), a first pressure gauge (15) and a vacuum pump (16) are installed on the residual liquid tank (14), the other path of the inlet of the first adsorption tower is correspondingly connected with an outlet pipeline of a buffer tank (19) through a first electromagnetic valve (17) and a third electromagnetic valve (18), a second pressure gauge (20), a compressor (21) and a ninth electromagnetic valve (22) are installed on an outlet pipe of the buffer tank (19), and the inlet of the buffer tank (19) is connected with an outlet pipeline of the LPG tank truck (4) through a tenth electromagnetic valve (23), a third VOCs concentration online detector (24) and an eleventh electromagnetic valve (25).
2. A method for cleaning an LPG tank truck based on a pressure swing adsorption technology comprises the following steps:
the first step is a nitrogen purge step; nitrogen in the liquid nitrogen tank (1) enters an LPG tank truck (4) through a fan (3) for full purging, the purged gas enters a buffer tank (19), online monitoring is carried out in the LPG tank truck (4) through a third VOCs concentration online detector (2), the detection of VOCs components is less than 0.2%, and purging can be stopped;
the second step is pressure swing adsorption recovery; after the gas in the buffer tank (19) in the first step is pressurized to 0.1MPa through a compressor (21), a first electromagnetic valve (17) and a sixth electromagnetic valve (7) on a first adsorption tower (5) are opened, a second electromagnetic valve (12), a third electromagnetic valve (13) and a fifth electromagnetic valve (11) are closed, tail gas passes through an activated carbon adsorbent laid in the first adsorption tower (5) from bottom to top, the adsorbent in the first adsorption tower (5) adsorbs organic matters, after the tail gas is purified, the content of the organic matters in the exhaust gas is lower than the specified emission requirement, and the gas is discharged from an exhaust pipe and enters a purging system in the first step for cyclic utilization; after the first adsorption tower (5) works for a period of time, the concentration of VOCs in the outlet pipe of the first adsorption tower (5) is detected by a first VOCs concentration online detector (8), if the content of organic matters in the exhaust gas is higher than 0.2 percent, the first electromagnetic valve (17), the fourth electromagnetic valve (13) and the sixth electromagnetic valve (7) are closed, the second electromagnetic valve (12), the third electromagnetic valve (18) and the seventh electromagnetic valve (9) are opened, the adsorption is carried out through the second adsorption tower (6), simultaneously, a vacuum pump (16) after the residue tank (14) is started carries out decompression desorption on the first adsorption tower (5), organic matters in the desorption equipment enter the residue tank (14), the desorption pressure is reduced to 10 +/-1 Pa, and opening the fifth electromagnetic valve (11), adjusting the pressure of the first adsorption tower (5) to micro-positive pressure, closing the fifth electromagnetic valve (11) again until all desorption operations are completed, and simultaneously performing cyclic reciprocating operation on the first adsorption tower (5) and the second adsorption tower (6).
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