A liquid hydrogen exhaust gas sealed storage tank and its gas sealing method

Abstract

The present invention discloses a liquid hydrogen discharge gas-sealed storage tank and its gas-sealing method. The present invention relates to the related field of hydrogen refueling stations, and includes two identical brackets. A cushion block is fixedly provided at the lower end of the bracket, and a storage tank is fixedly provided at the upper end of the bracket. The interior of the storage tank is a hollow structure, and the storage tank can store liquid hydrogen. A liquid hydrogen inlet pipe is connected to the left side of the storage tank, and a liquid hydrogen inlet valve is provided in the liquid hydrogen inlet pipe. The present invention uses hydrogen or helium to purge at the discharge port, so that the discharge port is in a hydrogen or helium atmosphere, isolating the storage tank exhaust port from the air, achieving a gas-sealing effect, thereby avoiding the appearance of liquid oxygen, solid oxygen, liquid nitrogen, and solid nitrogen. At the same time, the system is simplified and the cost is reduced. When it is detected that the temperature reaches a certain condition, the jet mechanism can be triggered to move to the outlet of the air outlet pipe and wrap around the surroundings, so as to better isolate the air.

Description

Technical Field

[0001] The present invention relates to the field related to hydrogen refueling stations, and specifically to a liquid hydrogen exhaust gas-sealed storage tank and its gas-sealing method. Background Technique

[0002] Domestic hydrogen refueling stations can be divided into gaseous hydrogen refueling stations and liquid hydrogen refueling stations according to the hydrogen storage mode. The density of liquid hydrogen is 6 times that of hydrogen at 20 MPa, and more hydrogen can be stored in the same volume. Therefore, future hydrogen refueling stations will develop towards liquid hydrogen refueling stations. Liquid hydrogen refueling stations use liquid hydrogen storage tanks to store liquid hydrogen. When a liquid hydrogen tanker fills the liquid hydrogen storage tank with liquid hydrogen, the upper part of the storage tank is connected to the atmosphere, and during the filling process, liquid is fed in while gas is exhausted to ensure the effective filling of liquid hydrogen.

[0003] At the initial stage of filling the liquid hydrogen storage tank, the exhaust gas from the storage tank is low-temperature hydrogen. As the liquid level in the storage tank gradually rises, the exhausted hydrogen gradually becomes a gas-liquid mixture or even liquid, and the temperature at the exhaust outlet gradually decreases. Since the melting and boiling points of oxygen are -218.4°C and -183°C respectively, and the melting and boiling points of nitrogen are -209.86°C and -196°C respectively, when the temperature at the exhaust outlet of the storage tank drops below -183°C, the oxygen and nitrogen in the air around the exhaust outlet will be liquefied and solidified, and may enter the exhaust and mix with the liquid hydrogen in the storage tank, leading to risks such as pipeline blockage and explosion. Based on this, the prior art usually adds a vaporizer or a flare system at the exhaust outlet to ensure the safety of the liquid hydrogen storage tank filling process. Summary of the Invention

[0004] The purpose of the present invention is to provide a liquid hydrogen exhaust gas-sealed storage tank and its gas-sealing method to solve the problems raised in the above background technique.

[0005] To achieve the above object, the present invention provides the following technical solution: A liquid hydrogen exhaust gas-sealed storage tank, comprising two identical brackets, with cushion blocks fixedly provided at the lower ends of the brackets, and a storage tank fixedly provided at the upper ends of the brackets. The interior of the storage tank is a hollow structure, and the storage tank can store liquid hydrogen. A liquid hydrogen inlet pipe is connected to the left side of the storage tank, and a liquid hydrogen inlet valve is provided in the liquid hydrogen inlet pipe, so that the liquid hydrogen in the storage tank can be added through the action of the liquid hydrogen inlet pipe. A first gas outlet pipe is connected to the right side of the storage tank, a first connector is connected to the first gas outlet pipe, a second gas outlet pipe is connected to the first connector, a second connector is connected to the second gas outlet pipe, and a third gas outlet pipe is connected to the right side of the second connector. A liquid hydrogen exhaust valve is provided in the third gas outlet pipe, so that the liquid hydrogen in the storage tank can enter the third gas outlet pipe through the first gas outlet pipe and the second gas outlet pipe, and then be discharged under the action of the liquid hydrogen exhaust valve in the third gas outlet pipe. A jetting mechanism is slidably provided on the third gas outlet pipe, so that the periphery of the third gas outlet pipe can be purged, so that the third gas outlet pipe is always in an auxiliary gas atmosphere, effectively isolating the air, achieving a gas-sealing effect, and thus avoiding the risk of pipeline blockage and explosion caused by liquid oxygen, liquid nitrogen, solid oxygen, and solid nitrogen. An auxiliary gas filling mechanism is fixedly provided at the upper right end of the storage tank, so as to communicate with the jetting mechanism, and then enable it to spray hydrogen or helium, so as to achieve a sealing effect.

[0006] Preferably, the jetting mechanism includes two identical sliding rods fixed to the right side of the second connector. The two sliding rods are respectively located at the upper and lower ends of the third gas outlet pipe. Sliding grooves are fixedly provided on the front and rear sides of each sliding rod, and sliding plates are slidably provided in the sliding grooves.

[0007] Preferably, a placement ring is connected to the sliding plate. The placement ring is in a circular ring shape and surrounds the outside of the third gas outlet pipe. A push rod is connected between the upper and lower sliding plates. A first electric rod is connected to the push rod, and the other end of the first electric rod is fixedly connected to the second connector. When the first electric rod is started, it can drive the push rod to move, so that the sliding plate can slide in the sliding groove on the sliding rod, and thus drive the placement ring to slide.

[0008] Preferably, an annular groove is provided in the placement ring. Four identical second electric rods are provided in the annular groove. Connecting columns are fixedly provided on the left and right sides of the second electric rods. An extension rod is hinged on the connecting column. The extension rod is arc-shaped, and a shielding cloth is connected to the extension rod. When the second electric rod expands and contracts, it can drive the extension rod to expand and contract, so that the shielding cloth can expand and contract, so that it can extend to the outside of the annular groove, and then can shield the third air outlet pipe.

[0009] Preferably, a connecting block is fixedly provided at the upper end of the second connector. The inside of the connecting block is a hollow structure. A jet hose is connected to the right side of the connecting block. The other end of the jet hose is connected to the placement ring. A plurality of nozzles are connected to the inner side of the placement ring. The jet hose is communicated with the nozzles, so that the liquid hydrogen in the jet hose can be sprayed out through the nozzles.

[0010] Preferably, the auxiliary gas filling mechanism includes an auxiliary gas filling block fixed to the upper right end of the storage tank. A jet hard pipe is connected between the auxiliary gas filling block and the connecting block, so that the auxiliary gas filling block and the connecting block can be communicated, so that the gas in the auxiliary gas filling block can enter the connecting block.

[0011] Preferably, two small storage bottle placement openings are provided at the upper end of the auxiliary gas filling block. The small storage bottle placement openings can place small storage bottles. An inflation port is provided on the front side of the auxiliary gas filling block. The inflation port can be directly inflated, so that gas can enter the auxiliary gas filling block, and then can enter the jet hard pipe, and then can be sprayed out through the nozzles.

[0012] Preferably, the auxiliary gas filling block is provided with a temperature detection device and is communicated with the storage tank, so as to detect the temperature of the liquid hydrogen in the storage tank. The auxiliary gas filling block is provided with a control device, so as to be linked with the detection device, so that when a certain temperature is reached, the gas in the small storage bottle placed on the small storage bottle placement opening can be discharged through the nozzles, and at the same time, the second electric rod and the first electric rod can be controlled to start.

[0013] A gas sealing method for a liquid hydrogen discharge gas-sealed storage tank includes the following steps:

[0014] Inflation process: The liquid hydrogen inlet valve is opened, and liquid hydrogen is added to the storage tank through the liquid hydrogen inlet pipeline.

[0015] Normal exhaust process: The liquid hydrogen exhaust valve in the third air outlet pipe is opened, so that the liquid hydrogen in the storage tank enters the first air outlet pipe, and then enters the second air outlet pipe, and then is discharged through the third air outlet pipe.

[0016] When exhausting at a temperature below -160°C: When the temperature detection device in the auxiliary aerated block detects that the temperature is below -160°C, it can transmit a signal to the control device, enabling the first electric rod and the second electric rod to start, driving the push rod to move, causing the sliding plate to slide in the sliding groove on the sliding rod, driving the placement ring to slide, moving the nozzle to the right end of the third air outlet pipe. At the same time, the second electric rod starts, enabling the extension rod to unfold, and the shielding cloth on the extension rod to unfold, wrapping the third air outlet pipe, and better isolating the air.

[0017] In summary, the beneficial effects of the present invention are as follows:

[0018] 1. By purging with hydrogen or helium at the discharge port, the present invention makes the discharge port in a hydrogen or helium atmosphere, isolates the storage tank exhaust port from the air, achieves a gas seal effect, thereby avoiding the appearance of liquid oxygen, solid oxygen, liquid nitrogen, and solid nitrogen, while simplifying the system and reducing costs.

[0019] 2. When the temperature reaches a certain condition, the present invention can trigger the movement of the jet mechanism, making it move to the air outlet pipe opening and wrapping the surrounding area, thereby better isolating the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of a liquid hydrogen discharge gas seal storage tank and its gas seal method of the present invention;

[0022] Figure 2 For the present invention Figure 1 The enlarged structure schematic diagram at A in;

[0023] Figure 3 For the present invention Figure 2 The sectional view structure schematic diagram at B - B in;

[0024] Figure 4 For the present invention Figure 3 The sectional view structure schematic diagram at C - C in;

[0025] Figure 5 For the present invention Figure 3 The sectional view structure schematic diagram at D - D in.

[0026] The reference numerals in the drawings are described separately as follows: 11, support; 12, cushion block; 13, storage tank; 14, liquid hydrogen inlet pipe; 15, liquid hydrogen inlet valve; 16, auxiliary gas filling block; 17, small storage bottle placement opening; 18, gas filling port; 19, first gas outlet pipe; 20, first connector; 21, second gas outlet pipe; 22, second connector; 23, third gas outlet pipe; 24, jet hard pipe; 25, connection block; 26, jet hose; 27, sliding rod; 28, sliding groove; 29, placement ring; 30, sliding plate; 31, first electric rod; 32, annular groove; 33, second electric rod; 34, nozzle; 35, extension rod; 36, push rod. Detailed implementation manners

[0027] All features disclosed in this specification, or all steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner.

[0028] Any feature disclosed in this specification (including any additional claims, abstract, and drawings), unless specifically stated, can be replaced by other equivalent or similar-purpose alternative features. That is, unless specifically stated, each feature is only an example of a series of equivalent or similar features.

[0029] The following is combined with Figures 1-5 to describe the present invention in detail. For the convenience of narration, the orientations mentioned below are defined as follows: The up, down, left, right, front, and back directions mentioned below are the same as the front, back, left, right, up, and down directions of the Figure 1 viewing direction, Figure 1 which is the front view of the device of the present invention, Figure 1 and the directions shown are the same as the front, back, left, right, up, and down directions of the front view direction of the device of the present invention.

[0030] Please refer to Figures 1-5, an embodiment provided by the present invention: a liquid hydrogen exhaust gas-sealed storage tank, comprising two identical brackets 11, a cushion block 12 is fixedly provided at the lower end of the bracket 11, a storage tank 13 is fixedly provided at the upper end of the bracket 11, the interior of the storage tank 13 is a hollow structure, and the storage tank 13 can store liquid hydrogen. A liquid hydrogen inlet pipe 14 is connected to the left side of the storage tank 13, and a liquid hydrogen inlet valve 15 is provided in the liquid hydrogen inlet pipe 14, so that the liquid hydrogen in the storage tank 13 can be added through the action of the liquid hydrogen inlet pipe 14. A first air outlet pipe 19 is connected to the right side of the storage tank 13, a first connector 20 is connected to the first air outlet pipe 19, a second air outlet pipe 21 is connected to the first connector 20, a second connector 22 is connected to the second air outlet pipe 21, and a third air outlet pipe 23 is connected to the right side of the second connector 22. A liquid hydrogen exhaust valve is provided in the third air outlet pipe 23, so that the liquid hydrogen in the storage tank 13 can enter the third air outlet pipe 23 through the first air outlet pipe 19 and the second air outlet pipe 21, and then be discharged under the action of the liquid hydrogen exhaust valve in the third air outlet pipe 23. A jet mechanism is slidably provided on the third air outlet pipe 23, so as to purge the periphery of the third air outlet pipe 23, so that the third air outlet pipe 23 is always in an auxiliary gas atmosphere, effectively isolating the air, achieving an air-sealing effect, and thus avoiding the risk of pipeline blockage and explosion caused by liquid oxygen, liquid nitrogen, solid oxygen, and solid nitrogen. An auxiliary gas filling mechanism is fixedly provided at the upper right end of the storage tank 13, which is communicated with the jet mechanism, and then it can spray hydrogen or helium to achieve a sealing effect.

[0031] In addition, in one embodiment, the jet mechanism includes two identical sliding rods 27 fixed to the right side of the second connector 22. The two sliding rods 27 are respectively located at the upper and lower ends of the third air outlet pipe 23. Sliding grooves 28 are fixedly provided on the front and rear sides of each sliding rod 27, and sliding plates 30 are slidably provided in the sliding grooves 28.

[0032] In addition, in one embodiment, a placement ring 29 is connected to the sliding plate 30. The placement ring 29 is in a circular ring shape and surrounds the outside of the third air outlet pipe 23. A push rod 36 is connected between the upper and lower sliding plates 30. A first electric rod 31 is connected to the push rod 36, and the other end of the first electric rod 31 is fixedly connected to the second connector 22. When the first electric rod 31 is started, it can drive the push rod 36 to move, so that the sliding plate 30 can slide in the sliding groove 28 on the sliding rod 27, and thus can drive the placement ring 29 to slide.

[0033] In addition, in one embodiment, an annular groove 32 is provided in the placement ring 29. Four identical second electric rods 33 are provided in the annular groove 32. Connecting columns are fixedly provided on the left and right sides of the second electric rod 33. An extension rod 35 is hinged on the connecting column. The extension rod 35 is arc-shaped, and a shielding cloth is connected to the extension rod 35. When the second electric rod 33 expands and contracts, it can drive the extension rod 35 to expand and contract, so that the shielding cloth can expand and contract, so that it can extend to the outside of the annular groove 32, and further can shield the third air outlet pipe 23.

[0034] In addition, in one embodiment, a connecting block 25 is fixedly provided at the upper end of the second connector 22. The inside of the connecting block 25 is a hollow structure. A jet hose 26 is connected to the right side of the connecting block 25. The other end of the jet hose 26 is connected to the placement ring 29. A plurality of nozzles 34 are connected to the inner side of the placement ring 29. The jet hose 26 is communicated with the nozzles 34, so that the liquid hydrogen in the jet hose 26 can be ejected through the nozzles 34.

[0035] In addition, in one embodiment, the auxiliary gas filling mechanism includes an auxiliary gas filling block 16 fixed to the upper right end of the storage tank 13. A jet hard pipe 24 is connected between the auxiliary gas filling block 16 and the connecting block 25, so as to be able to communicate the auxiliary gas filling block 16 and the connecting block 25, so that the gas in the auxiliary gas filling block 16 can enter the connecting block 25.

[0036] In addition, in one embodiment, two small storage bottle placement ports 17 are provided at the upper end of the auxiliary gas filling block 16. The small storage bottle placement ports 17 can place small storage bottles. An inflation port 18 is provided on the front side of the auxiliary gas filling block 16. The inflation port 18 can be directly inflated, so that gas can enter the auxiliary gas filling block 16, and further can enter the jet hard pipe 24, and further can be ejected through the nozzles 34.

[0037] In addition, in one embodiment, the auxiliary gas filling block 16 is equipped with a temperature detection device and is communicated with the storage tank 13, so as to be able to detect the temperature of the liquid hydrogen in the storage tank 13. The auxiliary gas filling block 16 is equipped with a control device, so as to be able to be linked with the detection device, so that when a certain temperature is reached, the gas in the small storage bottle placed on the small storage bottle placement port 17 can be discharged through the nozzles 34, and at the same time, the second electric rod 33 and the first electric rod 31 can be controlled to start.

[0038] A gas sealing method for a liquid hydrogen discharge gas-sealed storage tank includes the following steps:

[0039] Inflation process: The liquid hydrogen inlet valve 15 is opened, and liquid hydrogen is added to the storage tank 13 through the liquid hydrogen inlet pipe 14;

[0040] Normal exhaust process: The liquid hydrogen exhaust valve in the third outlet pipe 23 is opened, so that the liquid hydrogen in the storage tank 13 enters the first outlet pipe 19, and then enters the second outlet pipe 21, and thus is discharged through the third outlet pipe 23;

[0041] When exhausting at a temperature lower than -160°C: When the temperature detection device in the auxiliary gas filling block 16 detects that the temperature is lower than -160°C, it can transmit a signal to the control device, so that the first electric rod 31 and the second electric rod 33 can be started, so that the push rod 36 can be driven to move, so that the sliding plate 30 can slide in the sliding groove 28 on the sliding rod 27, so that the placement ring 29 can be driven to slide, so that the nozzle 34 can move to the right end of the third outlet pipe 23. At the same time, the second electric rod 33 is started, so that the extension rod 35 can be unfolded, so that the shielding cloth on the extension rod 35 can be unfolded, so that the third outlet pipe 23 can be wrapped, so that the air can be better isolated.

[0042] As described above, it is only the specific implementation manner of the invention, but the protection scope of the invention is not limited thereto. Any change or replacement that can be thought of without creative work should be covered by the protection scope of the invention. Therefore, the protection scope of the invention should be subject to the protection scope defined by the claims.

Claims

1. A liquid hydrogen discharge gas sealed storage tank, comprising two identical brackets (11), characterized in that: A cushion block (12) is fixedly provided at the lower end of the bracket (11). A storage tank (13) is fixedly provided at the upper end of the bracket (11). The interior of the storage tank (13) is a hollow structure. A liquid hydrogen inlet pipe (14) is connected to the left side of the storage tank (13). A liquid hydrogen inlet valve (15) is provided in the liquid hydrogen inlet pipe (14). A first gas outlet pipe (19) is connected to the right side of the storage tank (13). A first connector (20) is connected to the first gas outlet pipe (19). A second gas outlet pipe (21) is connected to the first connector (20). A second connector (22) is connected to the second gas outlet pipe (21). A third gas outlet pipe (23) is connected to the right side of the second connector (22). A liquid hydrogen exhaust valve is provided in the third gas outlet pipe (23). A jetting mechanism is slidably provided on the third gas outlet pipe (23). An auxiliary gas filling mechanism is fixedly provided at the upper right end of the storage tank (13); The jetting mechanism includes two identical sliding rods (27) fixed to the right side of the second connector (22). The two sliding rods (27) are respectively located at the upper and lower ends of the third gas outlet pipe (23). A sliding groove (28) is fixedly provided on the front and rear sides of each sliding rod (27). A sliding plate (30) is slidably provided in the sliding groove (28); A placement ring (29) is connected to the sliding plate (30). The placement ring (29) is in a circular ring shape and surrounds the outside of the third gas outlet pipe (23). A push rod (36) is connected between the upper and lower sliding plates (30). A first electric rod (31) is connected to the push rod (36). The other end of the first electric rod (31) is fixedly connected to the second connector (22); An annular groove (32) is provided in the placement ring (29). Four identical second electric rods (33) are provided in the annular groove (32). Connecting columns are fixedly provided on the left and right sides of the second electric rod (33). An extension rod (35) is hinged to the connecting column. The extension rod (35) is arc-shaped, and a shielding cloth is connected to the extension rod (35); A connecting block (25) is fixedly provided at the upper end of the second connector (22). The interior of the connecting block (25) is a hollow structure. A jetting hose (26) is connected to the right side of the connecting block (25). The other end of the jetting hose (26) is connected to the placement ring (29). A plurality of nozzles (34) are connected to the inner side of the placement ring (29). The jetting hose (26) is communicated with the nozzles (34); The auxiliary gas filling mechanism includes an auxiliary gas filling block (16) fixed to the upper right end of the storage tank (13). A temperature detection device is provided in the auxiliary gas filling block (16) and is communicated with the storage tank (13).

2. The hydrogen liquid discharge airtight storage tank according to claim 1, characterized in that: A jetting hard pipe (24) is connected between the auxiliary gas filling block (16) and the connecting block (25).

3. The hydrogen emission gas-sealed storage tank according to claim 2, wherein: Two small storage bottle placement openings (17) are provided at the upper end of the auxiliary gas filling block (16). An inflation port (18) is provided on the front side of the auxiliary gas filling block (16).

4. The liquid hydrogen vent gas-sealed storage tank according to claim 2, wherein: The auxiliary aerated block (16) is provided with a control device inside.

5. A gas seal method for a gas seal storage tank of liquid hydrogen discharge gas, characterized in that: It includes the following steps: Inflation process: The liquid hydrogen inlet valve (15) is opened, and liquid hydrogen is added to the storage tank (13) through the liquid hydrogen inlet pipe (14). Normal exhaust process: The liquid hydrogen exhaust valve in the third outlet pipe (23) is opened, so that the liquid hydrogen in the storage tank (13) enters the first outlet pipe (19), and then enters the second outlet pipe (21), and is thus discharged through the third outlet pipe (23). When exhausting at a temperature lower than -160 °C: When the temperature detection device in the auxiliary aerated block (16) detects that the temperature is lower than -160 °C, it can transmit a signal to the control device, so that the first electric rod (31) and the second electric rod (33) can be started, so as to drive the push rod (36) to move, so that the sliding plate (30) can slide in the sliding groove (28) on the sliding rod (27), so as to drive the placement ring (29) to slide, so that the nozzle (34) can move to the right end of the third outlet pipe (23). At the same time, the second electric rod (33) is started, so that the extension rod (35) can be unfolded, so that the shielding cloth on the extension rod (35) can be unfolded, so as to wrap the third outlet pipe (23), so as to better isolate the air.

Images