Hydrogen path system for icebreaking of hydrogen pump and fuel cell system with hydrogen path system

Abstract

The utility model relates to the field of fuel cells, in particular to a hydrogen path system for breaking ice of a hydrogen pump, a fuel cell system with the hydrogen path system, an electric pile, an ejector, the hydrogen pump and a gas-water separator. A hydrogen outlet in the electric pile is connected with the gas-water separator; the ejector is connected with a hydrogen inlet in the electric pile; the gas-water separator is connected with a hydrogen pump inlet in the hydrogen pump through a first gas inlet pipeline; the gas-water separator is connected with a hydrogen pump outlet in the hydrogen pump through a hydrogen pump drainage pipeline; a hydrogen pump heating drainage valve is arranged on the hydrogen pump drainage pipeline; two paths of gas are supplied into the hydrogen pump through the gas-water separator, firstly, heated hydrogen is supplied to assist the hydrogen pump to achieve the ice breaking probability, meanwhile, gas supply operation is carried out through the outlet of the hydrogen pump and can be matched with inlet gas of the inlet of the hydrogen pump, rotation of the impeller can be better assisted, and the ice breaking efficiency of the impeller is improved.

Description

Technical Field

[0001] The utility model relates to the field of fuel cells, in particular to a hydrogen path system for hydrogen pump ice breaking and a fuel cell system having the hydrogen path system. Background Art

[0002] Most of the current hydrogen circulation pumps use the Roots boosting mode, which has an oily environment and is large in mass and volume, resulting in high power consumption.

[0003] Therefore, the use of centrifugal pumps has gradually become the choice of some manufacturers. However, due to the thin centrifugal blades of centrifugal pumps and the presence of supersaturated water vapor during hydrogen operation, the blades are prone to ice after shutdown in a low-temperature environment and do not have the ability to break ice.

[0004] Therefore, how to prevent the centrifugal supercharger from freezing after shutdown or how to break the ice after freezing has become a major problem that needs to be solved in the industry. Patent 202222420279.1 provides a purge pipeline connected to the hydrogen circulation pipeline. After the centrifugal hydrogen pump finishes working, the purge valve is opened to purge the hydrogen pump. Although this utility model solution can ensure that there is no freezing after shutdown, it has a complex structure and is not easy to implement.

[0005] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of existing fuel cells. Utility Model Content

[0006] The purpose of the utility model is to provide a hydrogen circuit system which can assist in achieving ice breaking of a hydrogen pump impeller.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] A hydrogen circuit system for hydrogen pump ice breaking, comprising a fuel cell stack, an ejector, a hydrogen pump, and a gas-water separator;

[0009] The hydrogen outlet on the fuel cell stack is connected to the gas-water separator;

[0010] The ejector is connected to the hydrogen inlet on the fuel cell stack;

[0011] The gas-water separator is connected to the hydrogen pump inlet on the hydrogen pump through the first air inlet pipe;

[0012] The gas-water separator is connected to the hydrogen pump outlet on the hydrogen pump through a hydrogen pump drainage pipe;

[0013] A hydrogen pump heating drain valve is provided on the hydrogen pump drain pipeline.

[0014] The gas-water separator is provided with a separator hydrogen outlet and an external interface; the gas-water separator is connected to the first air inlet pipe through the separator hydrogen outlet;

[0015] The gas-water separator is connected to the hydrogen pump drainage pipeline through an external interface.

[0016] The external interface is distributed at one end of the gas-water separator close to the drain outlet.

[0017] The hydrogen pump is connected to the ejector through a reflux pipe, and a one-way valve is provided on the reflux pipe.

[0018] The drain port on the gas-water separator is connected to a separator drain pipe; a separator heating drain valve is provided on the separator drain pipe; and the separator drain pipe is connected to the tail drain.

[0019] The hydrogen pump outlet includes a transverse outlet and a longitudinal outlet, and the vertical cross-section of the hydrogen pump outlet is L-shaped; the hydrogen pump outlet takes in air along the tangential direction of the impeller in the hydrogen pump.

[0020] The air intake direction of the hydrogen pump outlet is opposite to the air intake direction of the hydrogen pump inlet.

[0021] A fuel cell system comprises the hydrogen path system.

[0022] The advantages of the present invention are:

[0023] The utility model discloses a hydrogen path system for hydrogen pump ice breaking and a fuel cell system with the hydrogen path system.

[0024] The utility model supplies two paths of gas into the hydrogen pump through a gas-water separator. First, by supplying heated hydrogen, the hydrogen pump can be assisted to achieve its ice-breaking probability. At the same time, the utility model performs gas supply operation through the hydrogen pump outlet, which can cooperate with the air intake of the hydrogen pump inlet, and can better assist the impeller to rotate and increase the impeller's ice-breaking efficiency.

[0025] At the same time, the hydrogen pump outlet disclosed in the utility model has additional functions, one function is for air intake operation, and the other function is for drainage operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following is a brief description of the contents and marks in the drawings of the utility model specification:

[0027] Figure 1 It is a structural diagram of the present utility model.

[0028] Figure 2 This is a schematic diagram of the structure of the hydrogen pump in this utility model.

[0029] The marks in the above figure are:

[0030] 1-gas-water separator; 2-hydrogen pump outlet; 3-first air inlet pipe; 4-hydrogen pump inlet; 5-reflux pipe; 6-one-way valve; 7-hydrogen pump; 8-hydrogen pump drain pipe; 9-hydrogen pump heating drain valve; 10-tail drain; 11-separator heating drain valve; 12-ejector; 13-fuel cell stack; 14-impeller. DETAILED DESCRIPTION

[0031] The following describes the preferred embodiment with reference to the accompanying drawings to further illustrate the specific implementation of the present invention.

[0032] A hydrogen circuit system for a hydrogen pump 7 to break ice, comprising a fuel cell 13, an ejector 12, a hydrogen pump 7 and a gas-water separator 1; the hydrogen outlet on the fuel cell 13 is connected to the gas-water separator 1; the ejector 12 is connected to the hydrogen inlet on the fuel cell 13; the gas-water separator 1 is connected to the hydrogen pump inlet 4 on the hydrogen pump 7 through a first air inlet pipe 3; the gas-water separator 1 is connected to the hydrogen pump outlet 2 on the hydrogen pump 7 through a hydrogen pump drainage pipe 8; a hydrogen pump heating drainage valve 9 is provided on the hydrogen pump drainage pipe 8; the utility model supplies two gasses into the hydrogen pump 7 through the gas-water separator 1, firstly, by supplying heated hydrogen, the hydrogen pump 7 can be assisted to achieve its ice-breaking probability, and at the same time, the utility model performs air supply operation through the hydrogen pump outlet 2, which can cooperate with the air intake of the hydrogen pump inlet 4, and can better assist the rotation of the impeller 14, thereby increasing the ice-breaking efficiency of the impeller 14.

[0033] The fuel cell stack 13, ejector 12, hydrogen pump 7 and gas-water separator 1 of the present invention all belong to existing structures; therefore, no additional description will be made here on the specific structure of each component.

[0034] In the utility model, the hydrogen outlet on the fuel cell stack 13 is connected to the gas-water separator 1; the ejector 12 is connected to the hydrogen inlet on the fuel cell stack 13; the gas-water separator 1 is connected to the hydrogen pump inlet 4 on the hydrogen pump 7 through the first air inlet pipe 3; the gas-water separator 1 is connected to the hydrogen pump outlet 2 on the hydrogen pump 7 through the hydrogen pump drainage pipe 8; based on the above design, the gas-water separator 1 disclosed in the utility model is equivalent to being arranged in parallel with the hydrogen pump 7; in normal use, the hydrogen separated by the gas-water separator 1 enters the hydrogen pump 7 through the first air inlet pipe 3, and the hydrogen pump 7 then supplies the corresponding gas into the ejector 12, and then supplies it into the fuel cell stack 13 through the ejector 12, thereby realizing the reuse of hydrogen.

[0035] The hydrogen pump drainage pipe 8 mainly plays a drainage role, which facilitates the water in the hydrogen pump 7 to be discharged into the gas-water separator 1, and then discharged to the outside through the drainage port of the gas-water separator 1. In the early stage of ice breaking, the hydrogen pump outlet 2 acts as an air inlet, so that when in use, the gas in the gas-water separator 1 can enter the hydrogen pump 7 through the hydrogen pump drainage pipe 8 to accelerate the ice breaking efficiency of the impeller 14 of the hydrogen pump 7.

[0036] At the same time, a hydrogen pump heating drain valve 9 is provided on the hydrogen pump drainage pipe 8 in the utility model; the basic function of the hydrogen pump heating drain valve 9 in the utility model is to control the on-off of the hydrogen pump drainage pipe 8; another function is that the hydrogen pump heating drain valve 9 has a heating function, which can be used to melt accumulated ice during the early stage of ice breaking.

[0037] Furthermore, in the utility model, the gas-water separator 1 is provided with a separator hydrogen outlet and an external interface; the gas-water separator 1 is connected to the first air inlet pipe 3 through the separator hydrogen outlet; the gas-water separator 1 is connected to the hydrogen pump drainage pipe 8 through the external interface; the separator hydrogen outlet is an inherent structure on the existing gas-water separator 1, and the external interface is a special limitation of the utility model. In essence, it is to connect a hole to the shell of the gas-water separator 1 so that the inner cavity of the shell is connected to the outside. The utility model facilitates the subsequent connection with the hydrogen pump drainage pipe 8 through the setting of the external interface, facilitates the gas in the hydrogen separator to enter the hydrogen pump 7, and also facilitates the discharge of water in the hydrogen pump 7.

[0038] Furthermore, in the present invention, the external interface is distributed at one end of the gas-water separator 1 close to the drain outlet; based on such a setting, when the gas supply operation can be realized, the subsequent rapid drainage operation can also be facilitated.

[0039] Furthermore, in the present invention, the hydrogen pump 7 is connected to the ejector 12 through a reflux pipe 5, and a one-way valve 6 is provided on the reflux pipe 5; the reflux pipe 5 plays a good connection role, and at the same time, the setting of the one-way valve 6 plays a good one-way isolation role to prevent hydrogen from flowing back from the ejector 12 into the hydrogen pump 7.

[0040] Furthermore, in the utility model, the drain outlet on the gas-water separator 1 is connected to a separator drain pipe; a separator heating drain valve 11 is provided on the separator drain pipe; the separator drain pipe is connected to the tail drain 10; the separator heating drain valve 11 can control the on-off of the drain outlet of the gas-water separator 1. When gas is supplied from the external interface, the separator heating drain valve 11 can be closed to prevent gas from flowing out of the drain outlet.

[0041] Furthermore, in the present invention, the hydrogen pump outlet 2 includes a transverse outlet 22 and a longitudinal outlet 21, and the vertical cross-section of the hydrogen pump outlet 2 is L-shaped; the hydrogen pump outlet 2 takes in air along the tangential direction of the impeller 14 in the hydrogen pump 7; the air intake direction of the hydrogen pump outlet 2 is opposite to the air intake direction of the hydrogen pump inlet 4; based on such a setting, the gas entering the hydrogen pump 7 from the hydrogen pump outlet 2 and the hydrogen pump inlet 4 forms a shear force to push the impeller 14 to rotate, so that the hydrogen pump 7 motor only needs to provide a smaller ice-breaking force to successfully break the ice, which improves the probability of successful ice breaking to a certain extent.

[0042] A fuel cell system comprises the hydrogen path system.

[0043] specific:

[0044] The utility model discloses a hydrogen circuit system for breaking ice of a hydrogen pump 7. The utility model is based on the existing hydrogen circuit structure and only requires a small amount of pipes and the local structure of the hydrogen pump 7 to achieve rapid cold start without generating parasitic power consumption.

[0045] The hydrogen circuit system disclosed in the present utility model mainly includes a gas-water separator 1, a hydrogen pump 7, a one-way valve 6, a hydrogen pump heating and draining valve 9 and a separator heating and draining valve 11.

[0046] The hydrogen pump 7 of the present invention is provided with a hydrogen pump outlet 2. In the present invention, the hydrogen pump outlet 2 needs to be a curved flow channel and form a certain angle with the inlet.

[0047] The hydrogen circuit system disclosed in the present utility model can be applied to start a cold start procedure when the starting temperature is lower than 0°C: the separator heating drain valve 11 of the gas-water separator 1 is closed and hydrogen is introduced (the hydrogen pressure is about 130kPaA). At this time, the hydrogen will enter the gas-water separator 1 and enter the hydrogen pump 7 through the first air inlet pipe 3 and the hydrogen pump drain pipe 8. The full name of the hydrogen pump 7 is the hydrogen circulation pump. At this time, the hydrogen circulation pump may be unable to rotate normally due to the freezing of the impeller 14 due to the low temperature, and the high-pressure hydrogen at the outlet of the fuel cell stack 13 will form a torque in the flow channel. At the same time, the hydrogen circulation pump rotates in the opposite direction (that is, rotates in the same direction as the above torque), and continues to increase the current until the hydrogen circulation pump operates normally; thereby achieving the ice-breaking operation.

[0048] At the same time, in the present invention, a one-way valve 6 is provided between the hydrogen pump 7 and the ejector 12 to prevent hydrogen from flowing back and causing structural failure.

[0049] At the same time, the ejector 12 is used to meet the hydrogen reflux requirements of high-power hydrogen fuel cells.

[0050] In the above structure, the gas-water separator 1 can be equipped with a nitrogen exhaust valve to exhaust nitrogen accumulated during the operation of the system.

[0051] In the above structure, the hydrogen circulation pump can be equipped with a position sensor to detect the movement of the impeller 14 so as to quickly identify whether the ice breaking is successful and then operate the hydrogen pump 7 normally.

[0052] Implementation plan:

[0053] When the hydrogen fuel cell engine is started, the environmental sensor first monitors the ambient temperature. If the starting temperature is lower than 0 degrees, the cold start program is started. Hydrogen is first introduced. At this time, the hydrogen pressure is about 130kPaA. The hydrogen enters the gas-water separator 1 and then enters the hydrogen pump 7 through the first air intake pipe 3 and the hydrogen pump drainage pipe 8. The hydrogen pump 7 receives air intake from two directions, so that it can better drive the impeller 14 to rotate.

[0054] In addition, since the hydrogen pump drainage pipe 8 is relatively thin and easily accumulates water, resulting in ice blockage, the hydrogen pump heating drainage valve 9 should be opened in advance during cold start to melt the accumulated ice.

[0055] At this time, the gas entering the hydrogen pump 7 from the hydrogen pump outlet 2 and the hydrogen pump inlet 4 forms a shear force due to the internal structure of the hydrogen pump 7, which drives the impeller 14 to rotate, so that the hydrogen pump 7 motor only needs to provide a smaller ice-breaking force to successfully break the ice, thereby increasing the probability of successful ice breaking; for the hydrogen pump 7, it only needs to provide a rotational torque in accordance with the gas pressure torque.

[0056] The design advantage of the present invention is that, without changing the original design structure of the hydrogen circuit of the fuel cell stack 13, only by changing the local structure of the hydrogen circulation pump and the hydrogen circuit control strategy, the cold start time of the hydrogen circulation pump can be significantly improved, the cold start success rate can be effectively increased, and the parasitic power consumption generated by the cold start can also be reduced.

[0057] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A hydrogen circuit system for hydrogen pump ice breaking, characterized in that: Including fuel cell stack, ejector, hydrogen pump and gas-water separator; The hydrogen outlet on the fuel cell stack is connected to the gas-water separator; The ejector is connected to the hydrogen inlet on the fuel cell stack; The gas-water separator is connected to the hydrogen pump inlet on the hydrogen pump through the first air inlet pipe; The gas-water separator is connected to the hydrogen pump outlet on the hydrogen pump through a hydrogen pump drainage pipe; A hydrogen pump heating drain valve is provided on the hydrogen pump drain pipeline.

2. A hydrogen circuit system for hydrogen pump ice breaking according to claim 1, characterized in that: The gas-water separator is provided with a separator hydrogen outlet and an external interface; the gas-water separator is connected to the first air inlet pipe through the separator hydrogen outlet; The gas-water separator is connected to the hydrogen pump drainage pipeline through an external interface.

3. A hydrogen circuit system for hydrogen pump ice breaking according to claim 2, characterized in that: The external interface is distributed at one end of the gas-water separator close to the drain outlet.

4. A hydrogen circuit system for hydrogen pump ice breaking according to claim 1, characterized in that: The hydrogen pump is connected to the ejector through a reflux pipe, and a one-way valve is provided on the reflux pipe.

5. The hydrogen circuit system for hydrogen pump ice breaking according to claim 1, characterized in that: The drain port on the gas-water separator is connected to a separator drain pipe; a separator heating drain valve is provided on the separator drain pipe; and the separator drain pipe is connected to the tail drain.

6. A hydrogen circuit system for hydrogen pump ice breaking according to claim 1, characterized in that: The hydrogen pump outlet includes a transverse outlet and a longitudinal outlet, and the vertical cross-section of the hydrogen pump outlet is L-shaped; the hydrogen pump outlet takes in air along the tangential direction of the impeller in the hydrogen pump.

7. A hydrogen circuit system for hydrogen pump ice breaking according to claim 6, characterized in that: The air intake direction of the hydrogen pump outlet is opposite to the air intake direction of the hydrogen pump inlet.

8. A fuel cell system, characterized in that: Comprising the hydrogen circuit system according to any one of claims 1 to 7.

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