A system and method for recovering excess liquid and gas in a tank truck filling pipeline

Abstract

The present invention discloses a system and method for recovering residual liquid and residual gas in a tank truck filling pipeline, which are used for recovering residual liquid and residual gas in the pipeline after the tank truck is filled, and belongs to the technical field of low-temperature liquid storage and transportation; the recovery system comprises a storage tank and a tank truck, the storage tank is connected with a gas phase filling pipeline and a liquid phase filling pipeline, the gas phase filling pipeline and the liquid phase filling pipeline are connected with the tank truck through a first filling hose and a second filling hose respectively, the first filling hose and the second filling hose are also connected with a buffer tank through a residual gas recovery pipeline and a residual liquid recovery pipeline respectively, the residual gas recovery pipeline is provided with a residual gas recovery valve, the residual liquid recovery pipeline is provided with a residual liquid recovery valve, and the outlet end of the buffer tank is connected to a raw gas pipeline or an external supply pipeline; the recovery system of the present invention can safely relieve the pressure of residual gas and residual liquid in the filling hose, avoids the instantaneous release of residual gas and residual liquid, improves the safety of operation, and recovers the residual gas and residual liquid at the same time, saving production costs.

Description

Technical Field

[0001] A system and method for recovering residual liquid and residual gas in a tank truck filling pipeline are used to recover residual liquid and residual gas in the pipeline after the tank truck is filled, belonging to the technical field of low-temperature liquid storage and transportation. Background Art

[0002] Cryogenic liquid products such as liquid nitrogen and liquid hydrogen need to be filled into tank trucks through a filling system and then transported to the site of use. In the prior art, after the tank truck is filled, residual liquid and gas remain in the filling pump pipeline and the filling hose, which are usually discharged to the outside by opening the drain valve and the exhaust valve, and cannot be recovered, resulting in waste. In addition, the pressure in the filling pump pipeline and the filling hose is high and the temperature is low, and the liquid is released instantly. If the operator is not careful during operation, it may frostbite the operator, which poses a great safety hazard and pollutes the surrounding environment. At the same time, due to the high noise caused by the instantaneous release, a high release concentration will cause harm to people. Long-term contact will also cause occupational diseases and other hazards, affecting human health. Summary of the invention

[0003] The purpose of the present invention is to provide a system and method for recovering residual liquid and gas in a tank truck filling pipeline, which can safely release the residual gas and liquid in the filling hose, avoid the instantaneous release of residual gas and liquid, reduce pollution to the environment and harm to operators, improve the safety factor of operation, ensure the personal safety of operators, and at the same time recover residual gas and liquid, eliminate waste, and save production costs.

[0004] The technical solution adopted by the present invention is as follows:

[0005] To achieve the above-mentioned objectives, the present invention provides a system for recovering residual liquid and gas in a tank truck filling pipeline, comprising a storage tank and a tank truck, the storage tank being connected with a gas-phase filling pipeline and a liquid-phase filling pipeline, the gas-phase filling pipeline and the liquid-phase filling pipeline being provided with a loading air inlet valve and a loading liquid inlet valve, respectively, the gas-phase filling pipeline and the liquid-phase filling pipeline being connected with the tank truck through a first filling hose and a second filling hose, respectively, the first filling hose being provided with a tank truck air inlet valve, the second filling hose being provided with a tank truck liquid inlet valve, the first filling hose and the second filling hose being further connected with a buffer tank through a residual gas recovery pipeline and a residual liquid recovery pipeline, respectively, the residual gas recovery pipeline being provided with a residual gas recovery valve, the residual liquid recovery pipeline being provided with a residual liquid recovery valve, and the outlet end of the buffer tank being connected to a raw gas pipeline or an external supply pipeline.

[0006] Preferably, a tank gas phase valve is provided at the inlet end of the gas phase filling pipeline.

[0007] Preferably, a tank liquid phase valve is provided at the inlet end of the liquid phase filling pipeline, and a loading pump is also provided at the outlet end of the liquid phase filling pipeline.

[0008] Preferably, the outlet end of the buffer tank is provided with a first pressure reducing valve, and is connected to the raw gas pipeline after pressure reduction.

[0009] Preferably, a vaporizer and a second pressure reducing valve are provided on the external supply pipeline.

[0010] The present invention also provides a method for recovering excess liquid and gas in a tank truck filling pipeline, comprising the following contents:

[0011] After the tank truck is filled, close the loading air inlet valve and the loading liquid inlet valve, open the residual gas recovery valve and the residual liquid recovery valve, so that the residual gas and residual liquid in the first filling hose and the second filling hose can be safely recovered to the buffer tank, open the first pressure reducing valve as needed, and the recovered residual gas and residual liquid can be decompressed and then enter the raw gas pipeline to be recovered as raw materials, or enter the external supply pipeline, open the second pressure reducing valve to supply to the outside after passing through the vaporizer, and finally remove the first filling hose and the second filling hose.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0013] The present invention connects the filling hose with the buffer tank, allowing the residual gas and liquid in the filling hose to be safely depressurized, avoiding the instantaneous release of the residual gas and liquid, reducing pollution to the environment and harm to operators, improving the safety factor of operation, ensuring the personal safety of operators, and at the same time recovering the residual gas and liquid, eliminating waste and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0015] Figure 1 It is a structural schematic diagram of the recovery system of the present invention.

[0016] Marked in the figure: 1-storage tank, 2-gas phase filling pipeline, 201-storage tank gas phase valve, 202-loading air inlet valve, 3-liquid phase filling pipeline, 301-storage tank liquid phase valve, 302-loading liquid inlet valve, 303-loading pump, 4-first filling hose, 401-tank truck air inlet valve, 5-second filling hose, 501-tank truck liquid inlet valve, 6-tank truck, 7-residual gas recovery pipeline, 701-residual gas recovery valve, 8-residual liquid recovery pipeline, 801-residual liquid recovery valve, 9-buffer tank, 10-raw gas pipeline, 11-first pressure reducing valve, 12-external supply pipeline, 13-vaporizer, 14-second pressure reducing valve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1

[0019] See also Figure 1 The present embodiment provides a system for recovering excess liquid and gas in a tank truck filling pipeline, including a storage tank 1 and a tank truck 6. The storage tank 1 is connected with a gas phase filling pipeline 2 and a liquid phase filling pipeline 3. The gas phase filling pipeline 2 and the liquid phase filling pipeline 3 are respectively provided with a loading gas inlet valve 202 and a loading liquid inlet valve 302. The inlet end of the gas phase filling pipeline 2 is provided with a storage tank gas phase valve 201, the inlet end of the liquid phase filling pipeline 3 is provided with a storage tank liquid phase valve 301, and the outlet end of the liquid phase filling pipeline 3 is also provided with a loading pump 303;

[0020] The gas phase filling pipeline 2 and the liquid phase filling pipeline 3 are connected to the tank truck 6 through the first filling hose 4 and the second filling hose 5 respectively. The first filling hose 4 is provided with a tank truck air inlet valve 401, and the second filling hose 5 is provided with a tank truck liquid inlet valve 501. The first filling hose 4 and the second filling hose 5 are also connected to the buffer tank 9 through the residual gas recovery pipeline 7 and the residual liquid recovery pipeline 8 respectively. The residual gas recovery pipeline 7 is provided with a residual gas recovery valve 701, and the residual liquid recovery pipeline 8 is provided with a residual liquid recovery valve 801. One outlet end of the buffer tank 9 is provided with a first pressure reducing valve 11, and is connected to the raw gas pipeline 10 after pressure reduction. The other outlet end of the buffer tank 9 is connected to the external supply pipeline 12, and the external supply pipeline 12 is provided with a vaporizer 13 and a second pressure reducing valve 14.

[0021] The work flow of the recovery system described in this embodiment is as follows: connect the tail ends of the gas phase filling pipeline 2 and the liquid phase filling pipeline 3 to the first filling hose 4 and the second filling hose 5 respectively, so that the gas phase filling pipeline 2 and the liquid phase filling pipeline 3 are connected to the tank truck 6, and then open the tank gas phase valve 201, the tank liquid phase valve 301, the loading gas inlet valve 202 and the loading liquid inlet valve 302 to fill the tank truck 6 with liquid and gas; after the tank truck 6 is filled, close the tank gas phase valve 201, the tank liquid phase valve 301, the loading gas inlet valve 202 and the loading liquid inlet valve 302, and open the residual gas recovery valve 7 01 and residual liquid recovery valve 801, so that the residual gas and residual liquid in the first filling hose 4 and the second filling hose 5 can be safely recovered to the buffer tank 9. There are two paths for the residual gas and residual liquid to return to the buffer tank 9, which can be selected according to needs. The first is to open the first pressure reducing valve 11, so that the recovered residual gas and residual liquid are depressurized and enter the raw gas pipeline 10 for recovery as raw materials. The second is to come out of the buffer tank 9 and enter the external supply pipeline 12, and after passing through the vaporizer 13, open the second pressure reducing valve 14 to supply it to the customer. Finally, disassemble the first filling hose 4 and the second filling hose 5 to complete the filling operation of the tank truck 6.

[0022] Example 2

[0023] This embodiment provides a method for recovering excess liquid and gas in a tank truck filling pipeline, including the following contents:

[0024] After the tank truck 6 is filled, close the loading air inlet valve 202 and the loading liquid inlet valve 302, open the residual gas recovery valve 701 and the residual liquid recovery valve 801, so that the residual gas and residual liquid in the first filling hose 4 and the second filling hose 5 can be safely recovered to the buffer tank 9, open the first pressure reducing valve 11 as needed, and the recovered residual gas and residual liquid can be depressurized and enter the raw gas pipeline 10 to be recovered as raw materials, or enter the external supply pipeline 12, open the second pressure reducing valve 14 to supply to the outside after passing through the vaporizer 13, and finally disassemble the first filling hose 4 and the second filling hose 5.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A system for recovering excess liquid and gas in a tank truck filling pipeline, comprising a storage tank (1) and a tank truck (6), characterized in that: The storage tank (1) is connected to a gas-phase filling pipeline (2) and a liquid-phase filling pipeline (3), and the gas-phase filling pipeline (2) and the liquid-phase filling pipeline (3) are respectively provided with a loading air inlet valve (202) and a loading liquid inlet valve (302). The gas-phase filling pipeline (2) and the liquid-phase filling pipeline (3) are respectively connected to a tank truck (6) through a first filling hose (4) and a second filling hose (5), and the first filling hose (4) is provided with a tank truck air inlet valve (401), and the second filling hose (5) is provided with a tank truck air inlet valve (402). The second filling hose (5) is provided with a tank truck liquid inlet valve (501); the first filling hose (4) and the second filling hose (5) are also connected to the buffer tank (9) through a residual gas recovery pipeline (7) and a residual liquid recovery pipeline (8), respectively; the residual gas recovery pipeline (7) is provided with a residual gas recovery valve (701); the residual liquid recovery pipeline (8) is provided with a residual liquid recovery valve (801); the outlet end of the buffer tank (9) is connected to a raw gas pipeline (10) or an external supply pipeline (12); The outlet end of the buffer tank (9) is provided with a first pressure reducing valve (11), and is connected to a raw gas pipeline (10) after pressure reduction; The external supply pipeline (12) is provided with a vaporizer (13) and a second pressure reducing valve (14).

2. A tank truck filling pipeline excess liquid and gas recovery system according to claim 1, characterized in that: The inlet end of the gas phase filling pipeline (2) is provided with a tank gas phase valve (201).

3. The system for recovering excess liquid and gas in a tank truck filling pipeline according to claim 1, characterized in that: The inlet end of the liquid-phase filling pipeline (3) is provided with a tank liquid-phase valve (301), and the outlet end of the liquid-phase filling pipeline (3) is also provided with a loading pump (303).

4. The recovery method of the excess liquid and gas recovery system of the tank truck filling pipeline according to claim 1 is characterized in that: Includes the following: After the tank truck (6) is filled, the loading air inlet valve (202) and the loading liquid inlet valve (302) are closed, and the residual gas recovery valve (701) and the residual liquid recovery valve (801) are opened to allow the residual gas and residual liquid in the first filling hose (4) and the second filling hose (5) to be safely recovered to the buffer tank (9). The first pressure reducing valve (11) is opened as needed to allow the recovered residual gas and residual liquid to be depressurized and then enter the raw material gas pipeline (10) to be recovered as raw materials, or enter the external supply pipeline (12) and open the second pressure reducing valve (14) to supply to the outside after passing through the vaporizer (13). Finally, the first filling hose (4) and the second filling hose (5) are disassembled.

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