Closed discharging and recycling system of gasoline / liquefied gas pump

Abstract

The utility model discloses a closed discharging and recycling system of a gasoline / liquefied gas pump, and relates to the technical field of pumps. According to the technical scheme, an inlet of a gasoline / liquefied gas pump is connected with a hot water flushing pipeline, a hot water flushing valve and a nitrogen quick connector are arranged on the hot water flushing pipeline, the nitrogen quick connector is connected with a nitrogen purging pipeline, and a nitrogen purging valve is arranged on the nitrogen purging pipeline; an outlet of the gasoline / liquefied gas pump is connected with a blowdown pipeline, a blowdown valve is arranged on the blowdown pipeline, the blowdown pipeline is connected with a three-phase separation tank, a separated gas discharge pipeline and a gasoline discharge pipeline of the three-phase separation tank are respectively connected with a recovery device, and a sewage discharge pipeline of the three-phase separation tank is connected with a sewage purification device. According to the utility model, the closed discharge of the gasoline / liquefied gas pump can be realized, the gasoline / liquefied gas pump can be cleaned, and the discharged medium can be uniformly recycled, so that the discharge of toxic and harmful gases is reduced, the pollution to the environment is reduced, and good social benefits are created.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump technical field, concretely relates to a gasoline / liquefied gas pump closed discharge recovery system. BACKGROUND

[0002] With the progress of society and the development of science and technology, people's awareness of environmental protection gradually strengthens, and the degree of attention to personal safety is also increasing. Under this background, unorganized emission problem gradually becomes the focus of environmental protection field. In order to maintain the ecological environment and protect people's health, any form of disorderly discharge behavior is strictly prohibited.

[0003] Taking petroleum chemical production as an example, the catalytic cracking device is the key equipment, and its absorption and stabilization system has more than ten gasoline and liquefied gas pumps. These pumps are in running state for a long time, and it is inevitable to have faults or need emergency treatment. In this case, in order to facilitate inspection and repair, the medium in the pump body is usually thrown out. However, the traditional discharge mode has many problems, and the usual practice is to use the waste liquid barrel to receive the discharge after the pressure is removed. This discharge mode is open, and the discharged liquid is directly discharged into the waste liquid barrel. In this process, the gas brought out is easy to drift into the air, causing air pollution. At the same time, the residual liquid is easy to spray out during discharge, which not only pollutes the environment by spilling to the ground, but also may spray on the operator's body, causing personal injury. In addition, this discharge mode also has safety hazards. If the waste liquid barrel is not handled properly, it may cause fire or explosion and other safety accidents. Therefore, for the catalytic cracking device and the absorption and stabilization system in petroleum chemical production, it is urgent to improve the discharge mode of gasoline and liquefied gas pump, and adopt a more environmentally friendly and safe method to reduce the impact on the environment and protect the safety of operators. CONTENT OF THE UTILITY MODEL

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art, provide a gasoline / liquefied gas pump closed discharge recovery system, which can not only realize the closed discharge of gasoline / liquefied gas pump under the condition of needing inspection, repair and emergency leakage, but also can clean the gasoline / liquefied gas pump and uniformly recover and treat the discharged medium, which is beneficial to recover the liquefied gas and gasoline components, reduce the emission of toxic and harmful gas, reduce the pollution to the environment, and create good social benefits.

[0005] The technical scheme of the utility model is:

[0006] The gasoline / liquefied gas pump closed discharge recovery system, the gasoline / liquefied gas pump inlet is connected with gasoline / liquefied gas feed line, and the gasoline / liquefied gas feed line is provided with gasoline / liquefied gas feed valve, the gasoline / liquefied gas pump outlet is connected with gasoline / liquefied gas discharge pipeline, and the gasoline / liquefied gas discharge pipeline is provided with gasoline / liquefied gas discharge valve;The inlet of the gasoline / liquefied gas pump is connected with hot water flushing pipeline, and the hot water flushing pipeline is provided with hot water flushing valve and nitrogen quick connector, the nitrogen quick connector is connected with nitrogen purging pipeline, and the nitrogen purging pipeline is provided with nitrogen purging valve;The outlet of the gasoline / liquefied gas pump is connected with blowdown pipeline, and the blowdown pipeline is provided with blowdown valve, and the blowdown pipeline is connected with three-phase separation tank, and the separation gas discharge pipeline and gasoline discharge pipeline of the three-phase separation tank are connected with recovery device respectively, and the sewage discharge pipeline of the three-phase separation tank is connected with sewage purification device.

[0007] Preferably, the hot water flushing pipeline and the gasoline / liquefied gas discharge pipeline are respectively connected with venting pipeline, and the venting pipeline is provided with venting valve.

[0008] Preferably, the gasoline / liquefied gas discharge pipeline is provided with pressure gauge.

[0009] Preferably, the hot water flushing pipeline is provided with hot water total valve and check valve.

[0010] Preferably, the recovery device comprises a gas compressor, a condensed oil separation tank, an absorption tower, a resolving tower, a stabilizing tower and a liquefied gas reflux tank, the gasoline outlet pipeline of the three-phase separation tank is connected with the air compressor inlet pipeline, the air compressor outlet is connected with the air cooler one through a pipeline, the air cooler one is connected with the air cooler two through a pipeline, the air cooler two outlet is connected with the condensed oil separation tank through a pipeline, and the condensed oil separation tank gas outlet is connected with the absorption tower gas inlet through a pipeline; the gasoline outlet pipeline of the three-phase separation tank is connected with the absorption tower oil inlet, the absorption tower feed pump is arranged on the gasoline outlet pipeline, the inlet end and the outlet end of the absorption tower feed pump are respectively provided with valves, the absorption tower bottom is connected with the air cooler two through the condensed oil outlet pipeline, the absorption tower bottom oil pump is arranged on the condensed oil outlet pipeline, the inlet end and the outlet end of the absorption tower bottom oil pump are respectively provided with valves, and the absorption tower top is connected with the exhaust pipeline; the condensed oil separation tank is connected with the resolving tower through the resolving tower feed pipeline, the resolving tower feed pump is arranged on the resolving tower feed pipeline, the inlet end and the outlet end of the resolving tower feed pump are respectively provided with valves; the resolving tower bottom is connected with the stabilizing tower through the stabilizing tower feed pipeline, the stabilizing tower feed pump is arranged on the stabilizing tower feed pipeline, the inlet end and the outlet end of the stabilizing tower feed pump are respectively provided with valves; the stabilizing tower top gas outlet is connected with the condenser through a pipeline, the condenser is connected with the liquefied gas reflux tank through a pipeline, the liquefied gas reflux tank is connected with the stabilizing tower through a reflux pipeline, the reflux pump is arranged on the reflux pipeline, the inlet end and the outlet end of the reflux pump are respectively provided with valves; the stabilizing tower bottom is connected with the absorption tower through the supplement oil pipeline, the supplement oil pump is arranged on the supplement oil pipeline, the inlet end and the outlet end of the supplement oil pump are respectively provided with valves.

[0011] Preferably, the inlet of the absorption tower feed pump, the absorption tower bottom oil pump, the resolving tower feed pump, the stabilizing tower feed pump, the reflux pump and the supplement oil pump are respectively connected with the hot water flushing pipeline through the flushing pipeline, and the flushing valve is arranged on the flushing pipeline; the outlet of the absorption tower feed pump, the absorption tower bottom oil pump, the resolving tower feed pump, the stabilizing tower feed pump, the reflux pump and the supplement oil pump are respectively connected with the waste oil recovery pipeline through the recovery pipeline, the waste oil recovery valve is arranged on the recovery pipeline, and the waste oil recovery pipeline is connected with the three-phase separation tank.

[0012] Preferably, the flushing pipeline of the absorption tower feed pump and the reflux pump is respectively connected with the vent pipeline and the nitrogen quick connector, the nitrogen quick connector is connected with the nitrogen purge pipeline, the nitrogen purge valve is arranged on the nitrogen purge pipeline, the recovery pipeline of the absorption tower feed pump and the reflux pump is respectively connected with the vent pipeline, and the vent valve is arranged on the vent pipeline; the gasoline outlet pipeline of the outlet end of the absorption tower feed pump and the reflux pipeline of the outlet end of the reflux pump are respectively provided with pressure gauges.

[0013] Preferably, the resolving tower top is connected with the air cooler one inlet through the resolving gas outlet pipeline.

[0014] Preferably, the sewage outlet of the condensed oil separation tank and the liquefied gas reflux tank is connected with the sewage purification device through a sewage discharge pipeline.

[0015] Preferably, a stabilizing tower feed pipeline is connected with a stabilizing tower feed heat exchanger, a supplementary oil pipeline is connected with the stabilizing tower feed heat exchanger, a supplementary oil outlet of the stabilizing tower feed heat exchanger is connected with a hot water heat exchanger through a pipeline, and a supplementary oil outlet of the hot water heat exchanger is connected with the absorption tower through a pipeline.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The gasoline / liquefied gas pump closed discharge recovery system of the utility model, through the additional hot water flushing pipeline and the blow-off pipeline, in combination with the method of nitrogen replacement, can not only realize the closed discharge of the gasoline / liquefied gas pump under the conditions of needing to be checked, maintained and emergency leakage, but also can clean the gasoline / liquefied gas pump and uniformly recycle and treat the discharge medium, is favorable for recycling the liquefied gas and gasoline components therein, reduces the discharge of toxic and harmful gas, reduces the pollution to the environment, creates good social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the structure schematic diagram of the gasoline / liquefied gas pump closed discharge recovery system of the utility model.

[0019] Figure 2 is the structure schematic diagram of the recovery device of the utility model.

[0020] In the figure, 1, gasoline / liquefied gas pump; 2, gasoline / liquefied gas feeding pipeline; 201, gasoline / liquefied gas feeding valve; 3, gasoline / liquefied gas discharging pipeline; 301, gasoline / liquefied gas discharging valve; 4, hot water flushing pipeline; 401, hot water flushing valve; 402, hot water total valve; 5, nitrogen gas quick connector; 6, nitrogen gas purging pipeline; 7, blowdown pipeline; 701, blowdown valve; 8, three-phase separation tank; 801, separation gas discharging pipeline; 802, gasoline discharging pipeline; 803, sewage discharging pipeline; 9, vent valve; 10, pressure gauge; 11, one-way valve; 12, gas compressor; 13, condensed oil separation tank; 14, absorption tower; 15, desorption tower; 16, stabilizing tower; 17, liquefied gas reflux tank; 18, air cooler I; 19, air cooler II; 20, absorption tower feeding pump; 21, valve; 22, concentrated oil discharging pipeline; 23, absorption tower bottom oil pump; 24, exhaust pipeline; 25, desorption tower feeding pipeline; 26, desorption tower feeding pump; 27, stabilizing tower feeding pipeline; 28, stabilizing tower feeding pump; 29, condenser; 30, reflux pipeline; 31, reflux pump; 32, supplementary oil pipeline; 33, supplementary oil pump; 34, flushing valve; 35, sewage oil recovery pipeline; 36, sewage oil recovery valve; 37, desorption gas discharging pipeline; 38, blowdown water pipeline; 39, stabilizing tower feeding heat exchanger; 40, hot water heat exchanger. DETAILED DESCRIPTION

[0021] In order to make the person skilled in the art better understand the technical scheme in the utility model, the technical scheme of the utility model will be clearly and completely described below in combination with the embodiments of the utility model.

[0022] Embodiment 1

[0023] As shown in the figure, the embodiment provides a gasoline / liquefied gas pump closed discharge recovery system, the inlet of the gasoline / liquefied gas pump 1 is connected with a gasoline / liquefied gas feeding pipeline 2, the gasoline / liquefied gas feeding pipeline 2 is provided with a gasoline / liquefied gas feeding valve 201, the outlet of the gasoline / liquefied gas pump 1 is connected with a gasoline / liquefied gas discharging pipeline 3, and the gasoline / liquefied gas discharging pipeline 3 is provided with a gasoline / liquefied gas discharging valve 301. Figure 1

[0024] When it is necessary to maintain or emergently treat the gasoline / liquefied gas pump 1, the gasoline / liquefied gas feeding valve 201 and the gasoline / liquefied gas discharging valve 301 are closed, and the gasoline / liquefied gas pump 1 is cut out. Figure 1 ​As shown, the inlet of the gasoline / liquefied gas pump 1 is connected with a hot water flushing pipeline 4, the hot water flushing pipeline 4 is provided with a hot water total valve 402, a hot water flushing valve 401, a one-way valve 11 and a nitrogen quick connector 5, the nitrogen quick connector 5 is connected with a nitrogen purging pipeline 6, the nitrogen purging pipeline 6 is provided with a nitrogen purging valve; the hot water flushing pipeline 4 and the gasoline / liquefied gas discharge pipeline 3 are respectively connected with a venting pipeline, the venting pipeline is provided with a venting valve 9, and the gasoline / liquefied gas discharge pipeline 3 is provided with a pressure gauge 10. The outlet of the gasoline / liquefied gas pump 1 is connected with a blowdown pipeline 7, the blowdown pipeline 7 is provided with a blowdown valve 701, and the blowdown pipeline 7 is connected with a three-phase separation tank 8, the separation gas discharge pipeline 801 and the gasoline discharge pipeline 802 of the three-phase separation tank 8 are respectively connected with a recovery device, and the sewage discharge pipeline 803 of the three-phase separation tank 8 is connected with a sewage purification device.

[0025] After the gasoline / liquefied gas pump 1 is cut off, the hot water total valve 402, the hot water flushing valve 401 and the blowdown valve 701 are opened, hot water is introduced into the gasoline / liquefied gas pump 1 through the hot water flushing pipeline 4 to flush it, and the medium in it is flushed out to the blowdown pipeline 7. After flushing for 10 minutes, the hot water flushing valve 401 is closed, the nitrogen purging pipeline 6 is connected to the nitrogen quick connector 5, and the nitrogen purging valve is opened to purge the gasoline / liquefied gas pump 1 with nitrogen. After purging for 5 minutes, the blowdown valve 701, the nitrogen purging valve and the hot water total valve 402 are closed in turn, the two venting valves 9 are opened, the purging condition is checked, it is confirmed that the purging is clean and there is no leakage in the valve 21, and then the closed discharge of the gasoline / liquefied gas pump 1 is completed. The medium flushed and purged out enters the three-phase separation tank 8 through the blowdown pipeline 7, the three-phase separation tank 8 processes the medium flushed and purged out from the gasoline / liquefied gas pump 1 in addition to the original product of the catalytic cracking device, the separated gas and crude gasoline enter the recovery device for further recovery, and the separated sewage enters the sewage purification device for unified purification. The sewage purification device can adopt a conventional device in the art, and will not be described here.

[0026] The closed discharge recovery system of the gasoline / liquefied gas pump 1 in the embodiment can realize the closed discharge of the gasoline / liquefied gas pump 1 under the conditions of needing to be checked, maintained and emergency leakage by adding the hot water flushing pipeline 4 and the blowdown pipeline 7 and combining the nitrogen replacement method, can clean the gasoline / liquefied gas pump 1, and can uniformly recover and process the discharged medium, which is beneficial to recovering the liquefied gas and gasoline components, reducing the emission of toxic and harmful gas, reducing the pollution to the environment, and creating good social benefits.

[0027] Example 2

[0028] On the basis of Example 1, as shown in Figure 2As shown, the recovery device includes a gas compressor 12, a condensed oil separation tank 13, an absorption tower 14, a desorption tower 15, a stabilizing tower 16 and a liquefied gas reflux tank 17. The separated gas outlet pipeline 801 is connected to the inlet of the gas compressor 12. The outlet of the gas compressor 12 is connected to an air cooler I 18 through a pipeline. The air cooler I 18 is connected to an air cooler II 19 through a pipeline. The outlet of the air cooler II 19 is connected to the condensed oil separation tank 13 through a pipeline. The gas outlet of the condensed oil separation tank 13 is connected to the gas inlet of the absorption tower 14 through a pipeline. The gasoline outlet pipeline 802 of the three-phase separation tank 8 is connected to the oil inlet of the absorption tower 14. The absorption tower feed pump 20 is arranged on the gasoline outlet pipeline 802. The inlet end and the outlet end of the absorption tower feed pump 20 are respectively provided with valves 21. The bottom of the absorption tower 14 is connected to the inlet of the air cooler II 19 through a condensed oil outlet pipeline. The absorption tower bottom oil pump 23 is arranged on the condensed oil outlet pipeline. The inlet end and the outlet end of the absorption tower bottom oil pump 23 are respectively provided with valves 21. The top of the absorption tower 14 is connected to an exhaust pipeline 24. The oil outlet of the condensed oil separation tank 13 is connected to the desorption tower 15 through a desorption tower feed pipeline 25. The desorption tower feed pipeline 25 is provided with a desorption tower feed pump 26. The inlet end and the outlet end of the desorption tower feed pump 26 are respectively provided with valves 21. The bottom of the desorption tower 15 is connected to the stabilizing tower 16 through a stabilizing tower feed pipeline 27. The stabilizing tower feed pipeline 27 is provided with a stabilizing tower feed pump 28 and a stabilizing tower feed heat exchanger 39. The inlet end and the outlet end of the stabilizing tower feed pump 28 are respectively provided with valves 21. The gas outlet at the top of the stabilizing tower 16 is connected to a condenser 29 through a pipeline. The condenser 29 is connected to the liquefied gas reflux tank 17 through a pipeline. The liquefied gas reflux tank 17 is connected to the stabilizing tower 16 through a reflux pipeline 30. The reflux pipeline 30 is provided with a reflux pump 31. The inlet end and the outlet end of the reflux pump 31 are respectively provided with valves 21. The bottom of the stabilizing tower 16 is connected to the stabilizing tower feed heat exchanger 39 through a supplementary oil pipeline 32. The supplementary oil outlet of the stabilizing tower feed heat exchanger 39 is connected to a hot water heat exchanger 40 through a pipeline. The supplementary oil outlet of the hot water heat exchanger 40 is connected to the absorption tower 14 through a pipeline. The supplementary oil pipeline 32 is provided with a supplementary oil pump 33. The inlet end and the outlet end of the supplementary oil pump 33 are respectively provided with valves 21.

[0029] The gas separated from the three-phase separation tank 8 enters the gas compressor 12 through the separation gas discharge pipeline 801, and after compression, is cooled to 40°C by the air cooler I 18 and the air cooler II 19 in turn, and then enters the condensed oil separation tank 13 for gas-liquid separation. The separated gas enters the absorption tower 14. At the same time, the crude gasoline separated from the three-phase separation tank 8 is pumped into the absorption tower 14 by the absorption tower feed pump 20 as an absorbent to absorb the C3 and C4 components in the gas separated from the condensed oil separation tank 13, and the gas discharged from the top of the absorption tower 14 is uniformly introduced into the post-treatment process through the exhaust pipeline 24. At the same time, the concentrated oil from the bottom of the absorption tower 14 is pumped into the air cooler II 19 by the absorption tower bottom oil pump 23 as an absorbent to absorb the C3 and C4 components in the gas in the air cooler II 19.

[0030] The condensed oil separated from the condensed oil separation tank 13 enters the top of the desorption tower 15 through the desorption tower feed pump 26, and the heat source is provided by the desorption tower bottom reboiler to desorb the <C2 components in the condensed oil. The deethanized gasoline is extracted from the bottom of the desorption tower, and after heat exchange with the stable gasoline extracted from the bottom of the stable tower 16 by the stable tower feed heat exchanger 39, is sent to the stable tower 16 by the stable tower feed pump 28 for multi-component fractionation. The liquefied petroleum gas is distilled from the top of the stable tower 16, condensed to 40°C by the condenser 29, and then introduced into the liquefied petroleum gas reflux tank 17. After being extracted by the reflux pump 31, part of it is refluxed to the top of the stable tower 16, and the rest is sent to the product refining section as liquefied petroleum gas product for desulfurization and demercaptan.

[0031] The stable gasoline from the bottom of the stable tower 16 is first cooled by heat exchange with the deethanized gasoline by the stable tower feed heat exchanger 39, and then further cooled by the hot water heat exchanger 40. Subsequently, part of it is sent to the top of the absorption tower 14 as a supplementary absorbent by the supplementary oil pump 33, and the other part is sent to the product refining section for demercaptan.

[0032] In addition, the desorption gas at the top of the desorption tower 15 is connected to the inlet of the air cooler I 18 through the desorption gas discharge pipeline 37, and the main components of the desorption gas are C2, C3 and C4 components, which go to the air cooler I 18 and continue to be absorbed by the absorption tower 14 to remove the C3 and C4 components therein. The sewage outlets of the condensed oil separation tank 13 and the liquefied petroleum gas reflux tank 17 are connected to the sewage purification device through the sewage discharge pipeline 38, so that the sewage generated by the condensed oil separation tank 13 and the liquefied petroleum gas reflux tank 17 is uniformly introduced into the sewage purification device for treatment.

[0033] Example 3

[0034] Based on Example 2, as Figure 2As shown, the inlets of the absorption column feed pump 20, the absorption column bottom oil pump 23, the stripping column feed pump 26, the stabilizing column feed pump 28, the reflux pump 31 and the make-up oil pump 33 are connected with the hot water flushing pipeline 4 through flushing pipelines, and flushing valves 34 are arranged on the flushing pipelines; the outlets of the absorption column feed pump 20, the absorption column bottom oil pump 23, the stripping column feed pump 26, the stabilizing column feed pump 28, the reflux pump 31 and the make-up oil pump 33 are connected with the dirty oil recovery pipeline 35 through recovery pipelines, and dirty oil recovery valves 36 are arranged on the recovery pipelines, and the dirty oil recovery pipeline 35 is connected with the three-phase separation tank 8.

[0035] When it is necessary to flush the absorption column feed pump 20, the absorption column bottom oil pump 23, the stripping column feed pump 26, the stabilizing column feed pump 28, the reflux pump 31 or the make-up oil pump 33, the corresponding flushing valves 34 and dirty oil recovery valves 36 are opened, hot water in the hot water flushing pipeline 4 is used to flush the corresponding pump, and the flushed medium enters the three-phase separation tank 8 through the dirty oil recovery pipeline 35 for recovery treatment.

[0036] Further, as shown, Figure 2 The flushing pipelines of the absorption column feed pump 20 and the reflux pump 31 are respectively connected with vent pipelines and nitrogen quick interfaces 5, the nitrogen quick interfaces 5 are connected with nitrogen purging pipelines 6, nitrogen purging valves are arranged on the nitrogen purging pipelines 6, vent pipelines are respectively connected to the recovery pipelines of the absorption column feed pump 20 and the reflux pump 31, and vent valves 9 are arranged on the vent pipelines; a pressure gauge 10 is arranged on the gasoline discharge pipeline 802 at the outlet end of the absorption column feed pump 20 and on the reflux pipeline 30 at the outlet end of the reflux pump 31.

[0037] When the absorption column feed pump 20 or the reflux pump 31 is flushed, after flushing for 10 minutes, the flushing valve 34 is closed, the nitrogen purging pipeline 6 is connected to the nitrogen quick interface 5, and the absorption column feed pump 20 or the reflux pump 31 is purged with nitrogen by opening the nitrogen purging valve. After purging for 5 minutes, the dirty oil recovery valve 36, the nitrogen purging valve and the hot water total valve 402 are closed in turn, the vent valve 9 is opened, the purging condition is checked, it is confirmed that the purging is clean and there is no leakage in the valve 21, and then the flushing is completed.

Claims

1. A gasoline / liquefied gas pump sealed discharge recovery system, a gasoline / liquefied gas feed pipeline (2) is connected to the inlet of the gasoline / liquefied gas pump (1), a gasoline / liquefied gas feed valve (201) is arranged on the gasoline / liquefied gas feed pipeline (2), a gasoline / liquefied gas discharge pipeline (3) is connected to the outlet of the gasoline / liquefied gas pump (1), and a gasoline / liquefied gas discharge valve (301) is arranged on the gasoline / liquefied gas discharge pipeline (3); characterized in that, The inlet of the gasoline / liquefied gas pump (1) is connected with a hot water flushing pipeline (4), the hot water flushing pipeline (4) is provided with a hot water flushing valve (401) and a nitrogen quick connector (5), the nitrogen quick connector (5) is connected with a nitrogen purging pipeline (6), the nitrogen purging pipeline (6) is provided with a nitrogen purging valve; the outlet of the gasoline / liquefied gas pump (1) is connected with a blowdown pipeline (7), the blowdown pipeline (7) is provided with a blowdown valve (701), the blowdown pipeline (7) is connected with a three-phase separation tank (8), the separation gas discharge pipeline (801) and the gasoline discharge pipeline (802) of the three-phase separation tank (8) are connected with a recovery device respectively, and the sewage discharge pipeline (803) of the three-phase separation tank (8) is connected with a sewage purification device.

2. The gasoline / LPG pump emission containment and recovery system of claim 1 wherein, The hot water flushing pipeline (4) and the gasoline / liquefied gas discharge pipeline (3) are respectively connected with a venting pipeline, and the venting pipeline is provided with a venting valve (9).

3. The gasoline / LPG pump emission containment and recovery system of claim 1 wherein, The gasoline / liquefied gas discharge pipeline (3) is provided with a pressure gauge (10).

4. The gasoline / LPG pump emission containment and recovery system of claim 1 wherein, The hot water flushing pipeline (4) is provided with a hot water main valve (402) and a check valve (11).

5. The gasoline / LPG pump emission containment and recovery system of claim 1 wherein, The recovery device comprises a gas compressor (12), a condensed oil separation tank (13), an absorption tower (14), a desorption tower (15), a stabilizing tower (16) and a liquefied gas reflux tank (17), a separation gas discharge pipeline (801) is connected with the inlet of the gas compressor (12), the outlet of the gas compressor (12) is connected with an air cooler I (18) through a pipeline, the air cooler I (18) is connected with an air cooler II (19) through a pipeline, the outlet of the air cooler II (19) is connected with the condensed oil separation tank (13) through a pipeline, and the gas outlet of the condensed oil separation tank (13) is connected with the gas inlet of the absorption tower (14) through a pipeline; a gasoline discharge pipeline (802) of the three-phase separation tank (8) is connected with the oil inlet of the absorption tower (14), the gasoline discharge pipeline (802) is provided with an absorption tower feed pump (20), the inlet end and the outlet end of the absorption tower feed pump (20) are respectively provided with valves (21), the bottom of the absorption tower (14) is connected with the inlet of the air cooler II (19) through a condensed oil discharge pipeline (22), the condensed oil discharge pipeline (22) is provided with an absorption tower bottom oil pump (23), the inlet end and the outlet end of the absorption tower bottom oil pump (23) are respectively provided with valves (21), and the top of the absorption tower (14) is connected with an exhaust pipeline (24); the oil outlet of the condensed oil separation tank (13) is connected with the desorption tower (15) through a desorption tower feed pipeline (25), the desorption tower feed pipeline (25) is provided with a desorption tower feed pump (26), the inlet end and the outlet end of the desorption tower feed pump (26) are respectively provided with valves (21); the bottom of the desorption tower (15) is connected with the stabilizing tower (16) through a stabilizing tower feed pipeline (27), the stabilizing tower feed pipeline (27) is provided with a stabilizing tower feed pump (28), the inlet end and the outlet end of the stabilizing tower feed pump (28) are respectively provided with valves (21); the gas outlet at the top of the stabilizing tower (16) is connected with a condenser (29) through a pipeline, the condenser (29) is connected with the liquefied gas reflux tank (17) through a pipeline, the liquefied gas reflux tank (17) is connected with the stabilizing tower (16) through a reflux pipeline (30), the reflux pipeline (30) is provided with a reflux pump (31), the inlet end and the outlet end of the reflux pump (31) are respectively provided with valves (21); the bottom of the stabilizing tower (16) is connected with the absorption tower (14) through a supplementary oil pipeline (32), the supplementary oil pipeline (32) is provided with a supplementary oil pump (33), the inlet end and the outlet end of the supplementary oil pump (33) are respectively provided with valves (21).

6. The gasoline / LPG pump emission containment and recovery system of claim 5 wherein, The inlets of the absorption column feed pump (20), the absorption column bottom oil pump (23), the stripping column feed pump (26), the stabilizing column feed pump (28), the reflux pump (31) and the make-up oil pump (33) are connected with the hot water flushing pipeline (4) through flushing pipelines, and flushing valves (34) are arranged on the flushing pipelines; the outlets of the absorption column feed pump (20), the absorption column bottom oil pump (23), the stripping column feed pump (26), the stabilizing column feed pump (28), the reflux pump (31) and the make-up oil pump (33) are connected with the dirty oil recovery pipeline (35) through recovery pipelines, and dirty oil recovery valves (36) are arranged on the recovery pipelines, and the dirty oil recovery pipeline (35) is connected with the three-phase separation tank (8).

7. The gasoline / LPG pump venting recovery system in accordance with claim 6 wherein, The flushing pipelines of the absorption column feed pump (20) and the reflux pump (31) are respectively connected with vent pipelines and nitrogen quick interfaces (5), the nitrogen quick interfaces (5) are connected with nitrogen purging pipelines (6), nitrogen purging valves are arranged on the nitrogen purging pipelines (6), vent pipelines are respectively arranged on the recovery pipelines of the absorption column feed pump (20) and the reflux pump (31), and vent valves (9) are arranged on the vent pipelines; a pressure gauge (10) is arranged on a gasoline discharge pipeline (802) at the outlet end of the absorption column feed pump (20) and a reflux pipeline (30) at the outlet end of the reflux pump (31).

8. The gasoline / LPG pump venting recovery system in accordance with claim 7 wherein, The top of the stripping column (15) is connected with the inlet of the air cooler I (18) through a stripping gas discharge pipeline (37).

9. The gasoline / LPG pump venting recovery system in accordance with claim 5 wherein, The dirty water outlets of the condensed oil separation tank (13) and the liquefied gas reflux tank (17) are connected with a sewage purification device through a sewage discharge pipeline (38).

10. The gasoline / LPG pump emission containment and recovery system of claim 5 wherein, The stabilizing column feed pipeline (27) is connected with a stabilizing column feed heat exchanger (39), the make-up oil pipeline (32) is connected with the stabilizing column feed heat exchanger (39), a make-up oil outlet of the stabilizing column feed heat exchanger (39) is connected with a hot water heat exchanger (40) through a pipeline, and a make-up oil outlet of the hot water heat exchanger (40) is connected with the absorption column (14) through a pipeline.

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