Pressurizing device for liquid hydrogen in tank

Abstract

The utility model relates to the field of hydrogen supply equipment, in particular to a supercharging device for liquid hydrogen in a tank, which is characterized in that a liquid hydrogen storage tank internally comprises liquid at the lower part and gas at the upper part, the middle is a gas-liquid interface, the upper part of the gas-liquid interface of the liquid hydrogen storage tank is provided with an upper port, the lower part of the gas-liquid interface is provided with a lower port, and both the upper port and the lower port are connected with an external pipeline of the liquid hydrogen storage tank; the lower port is sequentially connected with a stop valve, a one-way valve and a heat exchanger through a pipeline; the output end of the heat exchanger is communicated with a pressurizing reversing mechanism and hydrogen using equipment; and the pressurization reversing mechanism is connected with the upper port of the liquid hydrogen storage tank through a pipeline. By means of the structure, the supercharging device for the liquid hydrogen in the tank is long in service life and low in manufacturing cost.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen supply equipment, in particular to a pressurizing device for liquid hydrogen in a tank. Background Art

[0002] Liquid hydrogen storage offers advantages such as high hydrogen storage density, low operating pressure, low hydrogen storage tank production costs, and operational safety. It is one of the main development directions for future hydrogen energy applications in the transportation sector. The hydrogen supply pressure directly affects the power and economic efficiency of hydrogen-using fuel cells or hydrogen internal combustion engines. Currently, the most common method for supplying hydrogen is to heat the liquid hydrogen in the tank to increase the pressure and expel the liquid hydrogen from the tank. However, this method provides low hydrogen pressure and cannot fully meet the requirements of hydrogen-using devices. Another method is to place a liquid hydrogen pump inside the tank to pump the liquid hydrogen out of the tank. However, due to the low temperature inside the tank, the liquid hydrogen pump has a short lifespan and cannot meet the needs of mass production. Summary of the Invention

[0003] The utility model provides a pressurizing device for liquid hydrogen in a tank, so as to solve the technical problems existing in the prior art of low hydrogen supply pressure and short service life of a liquid hydrogen pump.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a pressurizing device for liquid hydrogen in a tank, the interior of the liquid hydrogen storage tank includes liquid in the lower part and gas in the upper part, with a gas-liquid interface in the middle, an upper opening is provided on the gas-liquid interface of the liquid hydrogen storage tank, and a lower opening is provided on the lower part of the gas-liquid interface, and both the upper opening and the lower opening are connected to the external pipeline of the liquid hydrogen storage tank; the lower opening is connected to a stop valve, a one-way valve, and a heat exchanger in sequence through a pipeline, and the output end of the heat exchanger is connected to a pressurizing reversing mechanism and a hydrogen-using equipment; the pressurizing reversing mechanism is connected to the upper opening of the liquid hydrogen storage tank through a pipeline.

[0005] Preferably, the pressurized reversing mechanism includes a three-way pipe I, a three-way pipe II, a three-way valve I, a three-way valve II, and a hydrogen pump; one interface of the three-way pipe I is connected to the upper port pipeline of the liquid hydrogen storage tank, and the other two interfaces are respectively connected to the three-way valve I and the three-way valve II; the three-way valve I and the three-way valve II are connected in the same manner, one interface is connected to the hydrogen pump, one interface is connected to the three-way pipe I, and the other interface is connected to the three-way pipe II; the two interfaces of the three-way pipe II are respectively connected to the three-way valve I and the three-way valve II, and the other interface is connected to the heat exchanger and the hydrogen-using equipment through pipelines.

[0006] Preferably, a gas-liquid separator is provided at the upper opening inside the liquid hydrogen storage tank.

[0007] Preferably, a safety valve is provided on the pipeline between the gas-liquid separator and the three-way pipe I.

[0008] Preferably, the one-way valve conducts in a direction from the stop valve to the heat exchanger.

[0009] Preferably, the conduction directions of the three-way valve I and the three-way valve II are controlled by a controller.

[0010] Preferably, a pressure sensor is provided inside the liquid hydrogen storage tank, a signal output end of the pressure sensor is connected to a controller, and a signal output end of the controller is connected to three-way valve I, three-way valve II and a hydrogen pump.

[0011] Preferably, a stabilizing net is provided at the lower opening of the liquid hydrogen storage tank.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention uses a centrifugal gaseous hydrogen circulation pump, and when the pressure in the tank is lower than the set value, the gasified hydrogen is pressurized and sent back to the liquid hydrogen storage tank, thereby increasing the pressure in the tank and pressing the liquid hydrogen in the storage tank out of the tank. When the pressure in the tank is higher than the set value, the inlet and outlet of the hydrogen pump are cut off, and the gaseous hydrogen in the tank flows out from the upper port under the action of high pressure, and is directly supplied to the hydrogen-using device through a three-way pipe and a three-way valve, thereby avoiding hydrogen exhaust, increasing safety risks, and improving the utilization rate of hydrogen. The present invention adopts a hydrogen pump, which is located outside the tank, has low cost and long service life. The reversing mechanism realizes two-way control, which can both pressurize and depressurize the storage tank, thereby realizing flexible and rapid control of the hydrogen supply pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the flow of liquid hydrogen;

[0016] Figure 3 Schematic diagram of the flow of gaseous hydrogen. DETAILED DESCRIPTION

[0017] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples provided are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0018] like Figure 1The device shown is a pressurizing device for liquid hydrogen in a tank. The interior of the liquid hydrogen storage tank consists of liquid at the bottom and gas at the top, with a gas-liquid interface in between. An upper opening is provided above the gas-liquid interface, and a lower opening is provided below the gas-liquid interface. Both the upper and lower openings are connected to external pipes. A gas-liquid separator 1 is provided at the upper opening of the liquid hydrogen storage tank, and a stabilizing net 13 is provided at the lower opening. The lower opening is connected to a shutoff valve 12, a one-way valve 11, and a heat exchanger 10 via pipes. The one-way valve 11 conducts from the shutoff valve 12 to the heat exchanger 10. The output end of the heat exchanger 10 is connected to a pressurization reversing mechanism and hydrogen-using equipment 9. The pressurization reversing mechanism is connected to the upper opening of the liquid hydrogen storage tank via pipes.

[0019] The pressurized reversing mechanism includes a three-way pipe I4, a three-way pipe II5, a three-way valve I6, a three-way valve II7, and a hydrogen pump 8. One interface of the three-way pipe I4 is connected to the upper port pipeline of the liquid hydrogen storage tank, and the other two interfaces are connected to the three-way valve I6 and the three-way valve II7 respectively. The three-way valve I6 and the three-way valve II7 are connected in the same manner, with one interface connected to the hydrogen pump 8, one interface connected to the three-way pipe I4, and the other interface connected to the three-way pipe II5. The two interfaces of the three-way pipe II5 are connected to the three-way valve I6 and the three-way valve II7 respectively, and the other interface is connected to the heat exchanger 10 and the hydrogen-using equipment 9 through a pipeline. The conduction direction of the three-way valve I6 and the three-way valve II7 is controlled by a controller. The liquid hydrogen storage tank is equipped with a pressure sensor 2. The signal output end of the pressure sensor 2 is connected to the controller, and the signal output end of the controller is connected to the three-way valve I6, the three-way valve II7, and the hydrogen pump 8.

[0020] A safety valve 3 is provided on the pipeline between the gas-liquid separator 1 and the tee pipe 14 as a safety guarantee.

[0021] When used specifically:

[0022] like Figure 2 As shown, under the action of gravity and pressure, liquid hydrogen passes through the stop valve 12 and the one-way valve 11, enters the heat exchanger 10 for heating, and vaporizes into gas. Part of the gaseous hydrogen is supplied to the hydrogen-using equipment 9, such as a fuel cell.

[0023] Due to the outflow of liquid hydrogen, the pressure inside the tank decreases. When the controller detects that the pressure inside the tank is lower than the set value, it controls the inlet and outlet 1 of three-way valve I6 to open, and the inlet and outlet 3 to close. The inlet and outlet 2 of three-way valve II7 are opened, and the inlet and outlet 1 is closed. The controller then starts hydrogen pump 8. The other hydrogen gas after passing through the heat exchanger passes through three-way pipe II5 and three-way valve I6, enters hydrogen pump 8 for pressurization, and then enters the liquid hydrogen storage tank through three-way pipe I4. The pressure of the liquid hydrogen storage tank rises due to the replenishment pressure of the gaseous hydrogen, and the liquid hydrogen is then driven out of the liquid hydrogen storage tank.

[0024] like Figure 3As shown, when the controller detects that the pressure in the tank is higher than the set value, it shuts off hydrogen pump 8. The controller controls inlet and outlet 3 of three-way valve I6 to open and inlet and outlet 1 to close, while inlet and outlet 2 to close. Simultaneously, the controller controls inlet and outlet 3 of three-way valve II5 to close, as well as inlet and outlet 1 and 2. This allows hydrogen in the tank to pass through gas-liquid separator 1, three-way pipe I4, three-way valve I6, and three-way pipe II5, and enter hydrogen-using equipment 9. This prevents hydrogen from entering the hydrogen pump, and the check valve 11 prevents hydrogen from flowing back into the liquid hydrogen storage tank.

Claims

1. A pressurizing device for liquid hydrogen in a tank, wherein the interior of the liquid hydrogen storage tank comprises liquid at the bottom and gas at the top, with a gas-liquid interface in the middle, characterized by: An upper opening is provided on the gas-liquid interface of the liquid hydrogen storage tank, and a lower opening is provided on the lower part of the gas-liquid interface, and both the upper opening and the lower opening are connected to an external pipeline of the liquid hydrogen storage tank; The lower port is connected to the stop valve (12), the one-way valve (11), and the heat exchanger (10) in sequence through a pipeline. The output end of the heat exchanger (10) is connected to the pressurized reversing mechanism and the hydrogen-using equipment (9); the pressurized reversing mechanism is connected to the upper port of the liquid hydrogen storage tank through a pipeline.

2. The pressurizing device for liquid hydrogen in a tank according to claim 1, characterized in that: The pressurizing reversing mechanism comprises a three-way pipe I (4), a three-way pipe II (5), a three-way valve I (6), a three-way valve II (7), and a hydrogen pump (8); one interface of the three-way pipe I (4) is connected to the upper opening pipeline of the liquid hydrogen storage tank, and the other two interfaces are respectively connected to the three-way valve I (6) and the three-way valve II (7); the three-way valve I (6) and the three-way valve II (7) are connected in the same manner, one interface is connected to the hydrogen pump (8), one interface is connected to the three-way pipe I (4), and the other interface is connected to the three-way pipe II (5); two interfaces of the three-way pipe II (5) are respectively connected to the three-way valve I (6) and the three-way valve II (7), and the other interface is simultaneously connected to the heat exchanger (10) and the hydrogen-using equipment (9) through pipelines.

3. The pressurizing device for liquid hydrogen in a tank according to claim 1, characterized in that: A gas-liquid separator (1) is provided at the upper opening inside the liquid hydrogen storage tank.

4. The pressurizing device for liquid hydrogen in a tank according to claim 3, characterized in that: A safety valve (3) is provided on the pipeline between the gas-liquid separator (1) and the three-way pipe I (4).

5. The pressurizing device for liquid hydrogen in a tank according to claim 1, characterized in that: The one-way valve (11) conducts in a direction from the stop valve (12) to the heat exchanger (10).

6. The pressurizing device for liquid hydrogen in a tank according to claim 2, characterized in that: The conduction directions of the three-way valve I (6) and the three-way valve II (7) are controlled by a controller.

7. The pressurizing device for liquid hydrogen in a tank according to claim 6, characterized in that: A pressure sensor (2) is provided inside the liquid hydrogen storage tank, a signal output end of the pressure sensor (2) is connected to a controller, and a signal output end of the controller is connected to a three-way valve I (6), a three-way valve II (7) and a hydrogen pump (8).

8. The pressurizing device for liquid hydrogen in a tank according to claim 1, characterized in that: A stabilizing net (13) is provided at the lower opening of the liquid hydrogen storage tank.

Images