Oil gas recovery processing device in cleaning process of railway tank car
By using devices such as hot air collection cylinders and catalytic oxidation reactors during the cleaning process of railway tank cars, the oil and gas in the cleaning process can be recovered and treated throughout the process, solving the problem of excessive VOC emissions and ensuring safety and environmental protection.
Patent Information
- Application Number
- CN202520247305.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-17
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-17
AI Technical Summary
Existing railway tank car cleaning equipment cannot achieve full-process oil and gas recovery during the cleaning process, resulting in excessive VOC emissions and affecting environmental protection and safety.
By employing a hot air collection cylinder, a hot air, nitrogen and steam co-input pipeline, a hot water input pipeline, and a waste liquid and waste gas co-output pipeline, combined with a catalytic oxidation reactor and a low-temperature diesel absorption tower, the entire process of oil and gas recovery and treatment during the cleaning process can be achieved.
This ensures that oil and gas emissions meet standards during the tank washing process, solves the occupational hazard problem for tank washing personnel, and achieves full-process oil and gas recovery.
Smart Images
Figure CN223818436U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to railway tank car oil gas recovery technical field relates to railway tank car cleaning process oil gas recovery treatment device. BACKGROUND
[0002] The liquid products and liquid chemical raw materials needed in the production of petrochemical industry and other industries are transported by railway tank cars, and the tank cars must be cleaned frequently to ensure the quality of the products.
[0003] There are two ways of cleaning railway tank cars at home and abroad, one is traditional steam cleaning without oil gas recovery, and the other is low-pressure water closed tank cleaning with partial oil gas recovery. The traditional steam cooking cleaning uses high-temperature steam to heat the tank car, and then the workers enter the tank car to clean it. The oil gas generated during the cleaning process is not recovered. Although this method has high cleaning efficiency, it requires a lot of manual labor and consumes a lot of steam. In addition, since the cleaning process is not closed, this method will result in a large amount of VOC emission during the cleaning process, which is not desirable in terms of energy saving, environmental protection, and safety improvement. In the low-pressure water closed tank cleaning, the medium-pressure water jet is formed by the water with a certain pressure through the nozzle, and is used as a tool to flush the inner wall of the tank car. At the same time, the high-concentration waste gas generated during the water washing and residual extraction stages of the cleaning process is sent to the oil gas recovery device for treatment, but the oil gas during the ventilation stage is not recovered. This method uses domestic water as the medium, and the three-dimensional hydraulic automatic cleaning nozzle on the cleaning machine sprays the inner wall of the tank car to form a 360° net-shaped spray surface, which can flush and clean the residual materials and impurities on the inner wall of the tank car, achieving the purpose of cleaning the inner wall of the tank car. Therefore, it has many advantages in safety, cost and environmental protection. The high-concentration oil gas in the early stage of tank cleaning is recovered. However, the closure achieved by this method is mostly pressure cap and capsule sealing, and there is no locking device after sealing. Water and steam may leak during the cleaning process, resulting in excessive VOC emission. In addition, this method does not recover the oil gas during the ventilation stage, resulting in high VOC emission during the ventilation and drying stages, especially in the early stage of ventilation, which cannot meet the emission standard requirements. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims to provide railway tank car cleaning process oil gas recovery treatment device, solves the problem that the existing railway tank car cleaning device cannot realize full-process oil gas recovery, resulting in excessive VOC emission.
[0005] The utility model adopts the technical scheme, railway tank car cleaning process oil gas recovery treatment device, including hot -blast gas collecting cylinder, hot -blast gas, nitrogen and steam common input pipeline, hot -water input pipeline, waste liquid and waste gas common output pipeline, hot -blast gas collecting cylinder installation in the tank car mouth, the bottom of hot -blast gas collecting cylinder is open -mouthed, with tank car inside intercommunication, the lateral wall of hot -blast gas collecting cylinder is circumscribed with hot -blast gas discharge pipeline, hot -blast gas discharge pipeline passes through homogenizing jar and sends to catalytic oxidation reactor, hot -blast gas, nitrogen and steam common input pipeline, hot -water input pipeline and waste liquid and waste gas common output pipeline all are through hot -blast gas collecting cylinder, with the top of hot -blast gas collecting cylinder all are through the cover plate connection fixed, hot -blast gas, nitrogen and steam common input pipeline has three imports and two exports, three imports are connected air heater, nitrogen system, steam pipe network respectively, one export stretches into tank car inside, and the other export is located in hot -blast gas collecting cylinder, the import of hot -water input pipeline is installed hot -water access, and the export is located in tank car inside, the import of waste liquid and waste gas common output pipeline is located in tank car inside, and the export is connected with gas -liquid separation jar, and the gas outlet of gas -liquid separation jar is connected with water ring vacuum pump, and the liquid discharge port is connected with sewage tank, and water ring vacuum pump is connected with low temperature diesel oil absorption tower through the pipeline.
[0006] Among them, the sealing cover plate and the sealing rubber ring are arranged between the hot air collecting cylinder and the tank car mouth.
[0007] The lateral wall of the hot air collecting cylinder is externally connected with a hot air discharge interface, and the hot air discharge interface is connected with the catalytic oxidation reactor through a hot air discharge pipeline.
[0008] The homogenizing jar and the tail gas pressurizing fan are sequentially connected between the hot air discharge interface and the catalytic oxidation reactor.
[0009] The condenser is installed between the waste liquid and waste gas common output pipeline and the gas-liquid separation jar.
[0010] The hot water input pipeline is a telescopic crane pipe, and a high-pressure rotary spray head is installed on the outlet of the hot water input pipeline.
[0011] The hot water access is used for externally connecting a hot water system.
[0012] The import of the waste liquid and waste gas common output pipeline is close to the bottom of the inner wall of the tank car.
[0013] The utility model has the advantages that through the hot air collecting cylinder, hot -blast gas, nitrogen and steam common input pipeline, hot -water input pipeline and waste liquid and waste gas common output pipeline, the oil gas generated in the whole process of railway tank car cleaning is recovered and treated, the high-concentration oil gas generated in the whole process of railway tank car cleaning is absorbed through the low-temperature diesel oil absorption tower, the low-concentration oil gas generated in the whole process of railway tank car cleaning is burned through the catalytic oxidation reactor, the standard emission of oil gas in the tank cleaning process is ensured, and the occupational hazards of the tank cleaning personnel are fundamentally solved. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the oil and gas recovery and treatment device for the cleaning process of railway tank cars according to this utility model.
[0015] In the diagram, 1. Hot air collection cylinder, 2. Common input pipeline for hot air, nitrogen, and steam, 3. Hot water input pipeline, 4. Common output pipeline for waste liquid and waste gas, 5. Tanker truck, 6. Catalytic oxidation reactor, 7. Air heater, 8. Nitrogen system, 9. Hot water inlet, 10. Gas-liquid separator, 11. Water ring vacuum pump, 12. Wastewater tank, 13. Low-temperature diesel absorption tower, 14. Sealing cover, 15. Hot air exhaust port, 16. Homogenization tank, 17. Exhaust gas pressurizing fan, 18. Condenser, 19. High-pressure rotary nozzle. Detailed Implementation
[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0017] Example 1
[0018] An oil and gas recovery and treatment device for the cleaning process of railway tank cars, see [link / reference] Figure 1 The system includes a hot air collection cylinder 1, a common input pipe 2 for hot air, nitrogen, and steam, a hot water input pipe 3, and a common output pipe 4 for waste liquid and waste gas. The hot air collection cylinder 1 is installed on the riser of the tank truck 5. The bottom of the hot air collection cylinder 1 is open and communicates with the interior of the tank truck 5. A hot air discharge pipe is connected to the outside of the side wall of the hot air collection cylinder 1. The hot air discharge pipe is connected to the catalytic oxidation reactor 6. The common input pipe 2 for hot air, nitrogen, and steam, the hot water input pipe 3, and the common output pipe 4 for waste liquid and waste gas all pass through the hot air collection cylinder 1 and are connected and fixed to the top of the hot air collection cylinder 1 by a cover plate. The input pipeline 2 has three inlets and two outlets. The three inlets are connected to the air heater 7, the nitrogen system 8, and the steam network, respectively. One outlet extends into the tank truck 5, and the other outlet is located in the hot air collection cylinder 1. The inlet of the hot water input pipeline 3 is equipped with a hot water inlet 9, and the outlet is located inside the tank truck 5. The inlet of the waste liquid and waste gas co-output pipeline 4 is located inside the tank truck 5, and the outlet is connected to a gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and the outlet is connected to a sewage tank 12. The water ring vacuum pump 11 is connected to a low-temperature diesel absorption tower 13 through a pipeline.
[0019] Example 2
[0020] A device for recovering and treating oil and gas during the cleaning process of railway tank cars includes a hot air collection cylinder 1, a common input pipe 2 for hot air, nitrogen and steam, a hot water input pipe 3, and a common output pipe 4 for waste liquid and waste gas. The hot air collection cylinder 1 is installed on the riser of the tank car 5. A sealing cover plate 14 and a sealing ring are provided between the hot air collection cylinder 1 and the riser of the tank car 5. The sealing ring is located between the sealing cover plate 14 and the riser of the tank car 5 to ensure that the gas inside the tank car will not leak from the riser.
[0021] The bottom of the hot air collection cylinder 1 is open and connected to the interior of the tank truck 5. A hot air exhaust pipe is connected to the outside of the side wall of the hot air collection cylinder 1, and the hot air exhaust pipe is connected to the catalytic oxidation reactor 6. The hot air, nitrogen and steam common input pipe 2, the hot water input pipe 3, and the waste liquid and waste gas common output pipe 4 all pass through the hot air collection cylinder 1 and are connected and fixed to the top of the hot air collection cylinder 1 by a cover plate. The hot air, nitrogen and steam common input pipe 2 has three inlets and two outlets. The three inlets are respectively connected to the air heater. 7. Nitrogen system; 8. Steam pipeline network, one outlet extends into the tank truck 5, the other outlet is located in the hot air collection cylinder 1; the inlet of the hot water input pipeline 3 is equipped with a hot water inlet 9, and the outlet is located inside the tank truck 5; the inlet of the waste liquid and waste gas co-output pipeline 4 is located inside the tank truck 5, and the outlet is connected to a gas-liquid separator 10; the outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and the drain outlet is connected to a sewage tank 12; the water ring vacuum pump 11 is connected to a cryogenic diesel absorption tower 13 through a pipeline.
[0022] Example 3
[0023] A device for recovering and treating oil and gas during the cleaning process of railway tank cars includes a hot air collection cylinder 1, a common input pipe 2 for hot air, nitrogen, and steam, a hot water input pipe 3, and a common output pipe 4 for waste liquid and waste gas. The hot air collection cylinder 1 is installed on the riser of the tank car 5. The bottom of the hot air collection cylinder 1 is open and communicates with the interior of the tank car 5. A hot air discharge pipe is connected to the outside of the side wall of the hot air collection cylinder 1. The hot air discharge pipe is connected to a catalytic oxidation reactor 6. The common input pipe 2 for hot air, nitrogen, and steam, the hot water input pipe 3, and the common output pipe 4 for waste liquid and waste gas all pass through the hot air collection cylinder 1 and are fixed to the top of the hot air collection cylinder 1 by cover plates. The hot air, nitrogen, and steam input pipeline 2 has three inlets and two outlets. The three inlets are connected to the air heater 7, the nitrogen system 8, and the steam network, respectively. One outlet extends into the tank truck 5, and the other outlet is located in the hot air collection cylinder 1. The hot water input pipeline 3 has a hot water inlet 9 installed at its inlet and an outlet located inside the tank truck 5. The waste liquid and waste gas output pipeline 4 has an inlet located inside the tank truck 5 and an outlet connected to a gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and the drain outlet is connected to a sewage tank 12. The water ring vacuum pump 11 is connected to a low-temperature diesel absorption tower 13 through a pipeline.
[0024] A sealing cover plate 14 and a sealing ring are installed between the hot air collection cylinder 1 and the riser of the tank truck 5. The sealing ring is located between the sealing cover plate 14 and the riser of the tank truck 5. A hot air discharge port 15 is connected to the outside of the side wall of the hot air collection cylinder 1. A homogenization tank 16 and a tail gas pressurizing blower 17 are connected in sequence between the hot air discharge port 15 and the catalytic oxidation reactor 6.
[0025] Example 4
[0026] A device for recovering oil and gas during the cleaning process of railway tank cars includes a hot air collection cylinder 1, a common input pipe 2 for hot air, nitrogen and steam, a hot water input pipe 3, and a common output pipe 4 for waste liquid and waste gas. The hot air collection cylinder 1 is installed on the riser of the tank car 5. A sealing cover plate 14 and a sealing ring are provided between the hot air collection cylinder 1 and the riser of the tank car 5. The sealing ring is located between the sealing cover plate 14 and the riser of the tank car 5.
[0027] The bottom of the hot air collection cylinder 1 is open and connected to the interior of the tank truck 5. A hot air exhaust pipe is connected to the outside of the side wall of the hot air collection cylinder 1, and the hot air exhaust pipe is connected to the catalytic oxidation reactor 6. The hot air, nitrogen and steam common input pipe 2, the hot water input pipe 3, and the waste liquid and waste gas common output pipe 4 all pass through the hot air collection cylinder 1 and are connected and fixed to the top of the hot air collection cylinder 1 by a cover plate. The hot air, nitrogen and steam common input pipe 2 has three inlets and two outlets. The three inlets are respectively connected to the air heater. 7. Nitrogen system; 8. Steam pipeline network, one outlet extends into the tank truck 5, the other outlet is located in the hot air collection cylinder 1; the inlet of the hot water input pipeline 3 is equipped with a hot water inlet 9, and the outlet is located inside the tank truck 5; the inlet of the waste liquid and waste gas co-output pipeline 4 is located inside the tank truck 5, and the outlet is connected to a gas-liquid separator 10; the outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and the drain outlet is connected to a sewage tank 12; the water ring vacuum pump 11 is connected to a cryogenic diesel absorption tower 13 through a pipeline.
[0028] A hot air discharge port 15 is connected to the outside of the side wall of the hot air collection cylinder 1. A homogenization tank 16 and a tail gas pressurizing fan 17 are connected in sequence between the hot air discharge port 15 and the catalytic oxidation reactor 6. A condenser 18 is installed between the waste liquid and waste gas co-output pipeline 4 and the gas-liquid separator 10.
[0029] Example 5
[0030] A device for recovering and treating oil and gas during the cleaning process of railway tank cars includes a hot air collection cylinder 1, a hot air, nitrogen, and steam co-input pipe 2, a hot water input pipe 3, and a waste liquid and waste gas co-output pipe 4. The hot air collection cylinder 1 is installed on the riser of the tank car 5. The bottom of the hot air collection cylinder 1 is open and communicates with the interior of the tank car 5. A hot air discharge pipe is connected to the outside of the side wall of the hot air collection cylinder 1. The hot air discharge pipe is connected to a catalytic oxidation reactor 6. The hot air, nitrogen, and steam co-input pipe 2, the hot water input pipe 3, and the waste liquid and waste gas co-output pipe 4 all pass through the hot air collection cylinder 1 and are fixed to the top of the hot air collection cylinder 1 by cover plates. The hot air, nitrogen, and steam input pipeline 2 has three inlets and two outlets. The three inlets are connected to the air heater 7, the nitrogen system 8, and the steam network, respectively. One outlet extends into the tank truck 5, and the other outlet is located in the hot air collection cylinder 1. The hot water input pipeline 3 has a hot water inlet 9 installed at its inlet and an outlet located inside the tank truck 5. The waste liquid and waste gas output pipeline 4 has an inlet located inside the tank truck 5 and an outlet connected to a gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and the drain outlet is connected to a sewage tank 12. The water ring vacuum pump 11 is connected to a low-temperature diesel absorption tower 13 through a pipeline.
[0031] A sealing cover 14 and a sealing ring are installed between the hot air collection cylinder 1 and the riser of the tank truck 5. The sealing ring is located between the sealing cover 14 and the riser of the tank truck 5. A hot air discharge port 15 is connected to the outside of the side wall of the hot air collection cylinder 1. A homogenization tank 16 and a tail gas pressurizing blower 17 are connected in sequence between the hot air discharge port 15 and the catalytic oxidation reactor 6. A condenser 18 is installed between the waste liquid and waste gas co-output pipe 4 and the gas-liquid separator 10. The hot water input pipe 3 is a telescopic loading arm. A high-pressure rotary nozzle 19 is installed at the outlet of the hot water input pipe 3 and is located inside the tank truck 5.
[0032] Example 6
[0033] A device for recovering and treating oil and gas during the cleaning process of railway tank cars includes a hot air collection cylinder 1, a common input pipe 2 for hot air, nitrogen and steam, a hot water input pipe 3, and a common output pipe 4 for waste liquid and waste gas. The hot air collection cylinder 1 is installed on the riser of the tank car 5, which is the railway tank car to be cleaned. A sealing cover plate 14 and a sealing ring are provided between the hot air collection cylinder 1 and the riser of the tank car 5. The sealing ring is located between the sealing cover plate 14 and the riser of the tank car 5 to prevent gas inside the tank car from leaking out from the riser.
[0034] The bottom of the hot air collecting cylinder 1 is open and connected to the inside of the tank truck 5. A hot air exhaust pipe is connected to the outside of the side wall of the hot air collecting cylinder 1. The hot air exhaust pipe is connected to the catalytic oxidation reactor 6. A handle is fixed on the outside of the hot air collecting cylinder 1 so that it can be installed on the riser of the tank truck during use.
[0035] The hot air, nitrogen, and steam co-input pipeline 2, the hot water input pipeline 3, and the waste liquid and waste gas co-output pipeline 4 all pass through the hot air collection cylinder 1. They are all connected and fixed to the top of the hot air collection cylinder 1 by cover plates. The hot air, nitrogen, and steam co-input pipeline 2 has three inlets and two outlets. The three inlets are respectively connected to the air heater 7, the nitrogen system 8, and the steam network. One outlet extends into the tank truck 5, and the other outlet is located in the hot air collection cylinder 1. The nitrogen system includes a connected nitrogen tank and a nitrogen compressor, used to supply nitrogen into the tank truck. The hot water input pipeline 3 has a hot water inlet 9 installed at its inlet, and its outlet is located inside the tank truck 5. The waste liquid and waste gas co-output pipeline 4 has its inlet inside the tank truck 5, and its outlet is connected to a gas-liquid separator 10. The outlet of the gas-liquid separator 10 is connected to a water ring vacuum pump 11, and its drain outlet is connected to a sewage tank 12. The water ring vacuum pump 11 is connected to a cryogenic diesel absorption tower 13 via a pipeline.
[0036] A hot air discharge port 15 is connected to the external side wall of the hot air collection cylinder 1. A homogenization tank 16 and a tail gas pressurizing fan 17 are sequentially connected between the hot air discharge port 15 and the catalytic oxidation reactor 6. A condenser 18 is installed between the waste liquid and waste gas co-output pipe 4 and the gas-liquid separator 10. The hot water input pipe 3 is a telescopic loading arm. A pipe lifting drive device connected to the hot water input pipe 3 is installed on the hot air collection cylinder 1 to adjust the position of the telescopic loading arm end inside the tank car. The pipe lifting drive device includes two sets of pulleys and a steel wire rope. One end of the steel wire rope is fixed to the hot water input pipe. The two sets of pulleys drive the steel wire rope to control the lifting and lowering of the hot water input pipe 3, thus realizing the extension and retraction of the telescopic loading arm. A high-pressure rotary nozzle 19 is installed at the outlet of the hot water input pipe 3. The high-pressure rotary nozzle 19 is located inside the tank car 5. In operation, hot water is sprayed into the tank car through the high-pressure rotary nozzle to flush and clean the inner wall of the railway tank car. A hot water inlet 9 is used to connect to an external hot water system. The inlet of the waste liquid and waste gas co-output pipe 4 is close to the bottom of the inner wall of the tank truck 5, which makes it easy to extract all liquids and gases from the tank truck during use.
[0037] When applying the oil and gas recovery and treatment device for the cleaning process of railway tank cars according to this utility model, first turn on the nitrogen system 8, condenser 18 and water ring vacuum pump 11. The nitrogen system introduces low-pressure nitrogen of 0.4MPa to 0.6MPa into the railway tank car to be cleaned. The water ring vacuum pump is used to remove residual oil and gas from the inside of the tank car. The extracted high-concentration oil and gas is sent to the condenser for cooling and then introduced into the gas-liquid separator. Finally, the gas enters the low-temperature diesel absorption tower 13 for adsorption, and the liquid enters the sewage tank. When the oxygen content inside the railway tank car is lower than 8%, the hot water system is connected to the hot water inlet, and low-pressure nitrogen and 60-80℃ hot water are introduced into the tank car to clean the inner wall of the tank car. The discharged gas-liquid mixture enters the condenser for cooling and then enters the gas-liquid separator 10 for gas-liquid separation. The separated gas is extracted by the vacuum pump and then... In the low-temperature diesel absorption tower, the separated liquid is discharged into the sewage tank. After hot water is introduced into the tank car for 3 to 5 minutes, the hot water system is shut off, the steam pipeline outlet valve is opened, and low-pressure nitrogen and steam are introduced into the tank car to further clean the interior. After steam is introduced into the tank car for 20 to 30 minutes, the steam pipeline outlet valve, condenser 18, and water ring vacuum pump 11 are shut off. The air heater, homogenization tank, exhaust gas pressurization fan, and catalytic oxidation reactor are turned on to introduce hot air into the tank car to ventilate and dry the interior. The discharged low-concentration oil and gas are homogenized in the homogenization tank and then drawn into the catalytic oxidation reactor for incineration by the exhaust gas pressurization fan. This achieves oil and gas recovery and treatment throughout the entire process of cleaning railway tank cars, fundamentally solving the occupational hazard problem for tank cleaning personnel.
Claims
1. An oil and gas recovery and treatment device for the cleaning process of railway tank cars, characterized in that, The system includes a hot air collection cylinder (1), a hot air, nitrogen, and steam input pipe (2), a hot water input pipe (3), and a waste liquid and waste gas output pipe (4). The hot air collection cylinder (1) is installed on the riser of the tank truck (5). The bottom of the hot air collection cylinder (1) is open and connected to the inside of the tank truck (5). A hot air discharge pipe is connected to the outside of the side wall of the hot air collection cylinder (1). The hot air discharge pipe is connected to the catalytic oxidation reactor (6). The hot air, nitrogen, and steam input pipe (2), the hot water input pipe (3), and the waste liquid and waste gas output pipe (4) all pass through the hot air collection cylinder (1). The junctions with the top of the hot air collection cylinder (1) are all connected and fixed by a cover plate. The input pipe (2) has three inlets and two outlets. The three inlets are connected to the air heater (7), nitrogen system (8), and steam network, respectively. One outlet extends into the tank truck (5), and the other outlet is located in the hot air collection cylinder (1). The inlet of the hot water input pipe (3) is equipped with a hot water inlet (9), and the outlet is located inside the tank truck (5). The inlet of the waste liquid and waste gas co-output pipe (4) is located inside the tank truck (5), and the outlet is connected to a gas-liquid separator (10). The outlet of the gas-liquid separator (10) is connected to a water ring vacuum pump (11), and the outlet is connected to a sewage tank (12). The water ring vacuum pump (11) is connected to a low-temperature diesel absorption tower (13) through a pipe.
2. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 1, characterized in that, A sealing cover plate (14) and a sealing ring are provided between the hot air collecting cylinder (1) and the riser of the tank car (5), with the sealing ring located between the sealing cover plate (14) and the riser of the tank car (5).
3. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 1, characterized in that, The hot air collection cylinder (1) has a hot air discharge port (15) connected to the outside of its side wall. The hot air discharge port (15) is connected to the catalytic oxidation reactor (6) through a hot air discharge pipe.
4. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 3, characterized in that, The hot air exhaust port (15) and the catalytic oxidation reactor (6) are connected in sequence to a homogenization tank (16) and a tail gas pressurizing fan (17).
5. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 4, characterized in that, A condenser (18) is installed between the waste liquid and waste gas co-output pipeline (4) and the gas-liquid separator (10).
6. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 5, characterized in that, The hot water input pipe (3) is a telescopic loading arm, and a high-pressure rotary nozzle (19) is installed at the outlet of the hot water input pipe (3). The high-pressure rotary nozzle (19) is located inside the tanker (5).
7. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 6, characterized in that, The hot water inlet (9) is used to connect to an external hot water system.
8. The oil and gas recovery and treatment device for the railway tank car cleaning process according to claim 7, characterized in that, The inlet of the waste liquid and waste gas co-output pipeline (4) is close to the bottom of the inner wall of the tank truck (5).