Fuel cell system hydrogen circulation module with low cost and high reliability

Abstract

The utility model discloses a fuel cell system hydrogen circulation module with low cost and high reliability, which comprises a condensation module, a water collection and separation module, a drain valve and a circulation pump, the left side of the condensation module is connected with an electric pile drainage hydrogen outlet, and the right side of the condensation module is connected with the water collection and separation module. The working condition requirement of a low-power fuel cell is completely met, the hydrogen utilization rate and the environmental adaptability of the fuel cell are improved, the safety is improved, particularly for a product taking a solid hydrogen storage system as a hydrogen source, a fuel cell system matched with a module can greatly relieve the application limitation of the solid hydrogen source caused by the hydrogen storage amount and the hydrogen release rate, and the application prospect is wide. The hydrogen storage capacity and the hydrogen release flow are utilized to the maximum extent, the humidity of circulating hydrogen is effectively controlled through a dew point temperature control strategy of the condensation module, and the health degree and the effect of the fuel cell stack are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydrogen circulation, and in particular relates to a low-cost and high-reliability hydrogen circulation module for a fuel cell system. Background Art

[0002] In the fuel cell system, in order to make the internal reaction of the fuel cell stack sufficient and improve the output performance, excess hydrogen and air are usually supplied. The function of the hydrogen circulation system is to recycle the unreacted hydrogen in the fuel cell stack to the hydrogen inlet of the fuel cell stack to save hydrogen fuel and improve the utilization rate of hydrogen. At the same time, part of the water generated by the electrochemical reaction of hydrogen and oxygen in the fuel cell stack is discharged along with the hydrogen circulation, and then the hydrogen with controlled humidity is circulated to the inlet of the fuel cell stack.

[0003] In actual working conditions, hydrogen circulation systems are often used in high-power fuel cells. Low-power fuel cell products are often difficult to use hydrogen circulation modules due to cost and system complexity. In addition, the humidity of the circulating hydrogen is not controlled in the usual hydrogen circulation system. In many cases, this will cause excessive humidity in the hydrogen to have a negative impact on the fuel cell. In order to control the humidity, the traditional approach is to use a dryer, which in turn brings about the cost of periodic filter replacement and additional maintenance work. Professional water vapor separation equipment is often large in size, weight, power consumption, and cost, which creates an additional system burden. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a low-cost and high-reliability hydrogen circulation module for a fuel cell system, so as to solve the problem raised in the above-mentioned background technology that in actual working conditions, the hydrogen circulation system is often used in high-power fuel cells, and low-power fuel cell products are often difficult to use hydrogen circulation modules due to cost and system complexity restrictions. In addition, the humidity of the circulating hydrogen is not controlled in the composition of the usual hydrogen circulation system, which in many cases will cause the negative impact of excessive hydrogen humidity on the fuel cell. In order to control the humidity, the traditional practice is to use a dryer, which will bring about the cost of periodic replacement of the filter element and additional maintenance work. Professional water vapor separation equipment is often very large in size, weight, power consumption, and cost, which in turn causes the problem of additional system burden.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low-cost and high-reliability hydrogen circulation module for a fuel cell system, comprising a condensation module, a water collection and separation module, a drain valve and a circulation pump, wherein the left side of the condensation module is connected to a fuel cell stack drainage hydrogen outlet, the right side of the condensation module is connected to a water collection and separation module, a condensation temperature sensor is connected between the condensation module and the water collection and separation module, the lower end of the water collection and separation module is connected to a drain valve, the right end of the water collection and separation module is connected to a circulation pump, and the right end of the circulation pump is connected to a fuel cell stack hydrogen inlet.

[0006] Preferably, the condensation module adopts a low-power semiconductor refrigeration sheet, a radiator and a cooling fan.

[0007] Preferably, the water collection and separation module adopts a low-cost water collector.

[0008] Preferably, the lower end of the drain valve is connected to a water collecting box.

[0009] Preferably, the drain valve adopts a two-position, two-way normally closed solenoid valve.

[0010] Preferably, the circulation pump adopts a brushless diaphragm pump with high reliability and long life.

[0011] Compared with the prior art, the utility model provides a low-cost and high-reliability hydrogen circulation module for a fuel cell system, which has the following beneficial effects:

[0012] 1. The utility model adopts a low-cost, high-reliability hydrogen circulation solution that solves both hydrogen circulation and humidity control by setting up a low-cost and high-reliability hydrogen circulation module for a fuel cell system. The modular design can be used with the current mainstream low-power fuel cell system. It has been verified by experiments that it fully meets the working conditions of low-power fuel cells, which not only improves the hydrogen utilization rate and environmental adaptability of the fuel cell, but also improves the safety. In particular, for products using a solid hydrogen storage system as a hydrogen source, the fuel cell system with the module can greatly alleviate the application limitations of the solid hydrogen source due to the hydrogen storage capacity and hydrogen release rate, so that both the hydrogen storage capacity and the hydrogen release flow rate can be utilized to the maximum extent. At the same time, through the dew point temperature control strategy of the condensation module, the humidity of the circulating hydrogen can also be effectively controlled, greatly improving the health and efficacy of the fuel cell stack.

[0013] 2. The utility model solves the technical difficulties that most low-power fuel cell products in the industry currently have no hydrogen circulation function, the humidity of the circulating hydrogen is difficult to control, and the hydrogen circulation module is too expensive, too large, and too heavy by setting up a low-cost and high-reliability fuel cell system hydrogen circulation module. In addition, the waste of hydrogen caused by hydrogen discharge to the environment affects the energy consumption and cost of hydrogen energy power supply system products. Hydrogen discharge to the environment also brings substantial safety risks and environmental use restrictions.

[0014] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model has a scientific and reasonable structure, is safe and convenient to use, and provides great help to people. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the system structure of a low-cost and high-reliability fuel cell system hydrogen circulation module proposed by the utility model;

[0017] In the figure: fuel cell stack drainage hydrogen outlet 1, condensation module 2, condensation temperature sensor 3, water collection and separation module 4, drainage valve 5, water collection box 6, circulation pump 7, fuel cell stack hydrogen inlet 8. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1The utility model provides a technical solution: a low-cost and high-reliability hydrogen circulation module for a fuel cell system, comprising a condensing module 2, a water collection and separation module 4, a drain valve 5 and a circulation pump 7. The left side of the condensing module 2 is connected to a fuel cell stack drain hydrogen outlet 1, the right side of the condensing module 2 is connected to the water collection and separation module 4, a condensing temperature sensor 3 is connected between the condensing module 2 and the water collection and separation module 4, the lower end of the water collection and separation module 4 is connected to the drain valve 5, the right end of the water collection and separation module 4 is connected to the circulation pump 7, and the right end of the circulation pump 7 is connected to the fuel cell stack hydrogen inlet 8. A low-cost, high-reliability hydrogen circulation module that simultaneously solves hydrogen circulation and humidity control is adopted. The modular design of the ring solution can be used with the current mainstream low-power fuel cell system. It has been verified by experiments that it fully meets the working conditions of low-power fuel cells. It not only improves the hydrogen utilization rate and environmental adaptability of the fuel cell, but also improves safety. Especially for products with solid hydrogen storage systems as hydrogen sources, the fuel cell system with modules can greatly alleviate the application limitations of solid hydrogen sources due to hydrogen storage capacity and hydrogen release rate, so that both hydrogen storage capacity and hydrogen release flow can be utilized to the maximum extent. At the same time, through the dew point temperature control strategy of the condensation module, the humidity of the circulating hydrogen can be effectively controlled, greatly improving the health and efficacy of the fuel cell stack.

[0020] In the present invention, preferably, the condensation module 2 adopts a low-power semiconductor refrigeration sheet, a radiator and a cooling fan.

[0021] In the present invention, preferably, the water collection and separation module 4 adopts a low-cost water collector.

[0022] In the present invention, preferably, the lower end of the drain valve 5 is connected to a water collecting box 6 .

[0023] In the present invention, preferably, the drain valve 5 adopts a two-position, two-way normally closed solenoid valve.

[0024] In the present invention, preferably, the circulation pump 7 adopts a brushless diaphragm pump with high reliability and long life.

[0025] The working principle and use process of the utility model: when in use, the hydrogen circulation system includes 4 modules and functional components, a condensation module, a water collection and separation module, a drain valve and a circulation pump.

[0026] The condensation module uses a low-power semiconductor cooling sheet, a radiator and a cooling fan to condense the water vapor from the outlet of the fuel cell stack to form liquid water;

[0027] The water collection and separation module uses a low-cost water collector to separate the liquid water and hydrogen in the condensation module. The separated liquid water is connected to the drain valve through the lower joint, and the separated hydrogen is connected to the circulation pump;

[0028] The drain valve uses a two-position, two-way normally closed solenoid valve, which is controlled by the fuel cell system to periodically drain the liquid water in the water collector;

[0029] The circulation pump uses a high-reliability, long-life brushless diaphragm pump, which is turned on intermittently to create hydrogen circulation internal pressure, taking the water produced by the reaction in the fuel cell out of the fuel cell, while circulating the separated hydrogen into the fuel cell hydrogen inlet, achieving water drainage and hydrogen circulation functions;

[0030] The condensing module, drain valve, and circulation pump are all connected to the fuel cell control system through standard electrical interfaces. According to the condensing temperature sensor data, the condensing temperature control, drainage, and circulation interval are achieved through program adjustment. The control strategy can be adapted to most fuel cell systems. As it is an independently packaged circulation module, equipped with standard electrical and pipeline interfaces, it can be an optional configuration for many fuel cell power supply systems. It can be configured according to the environment and user requirements, with high freedom, small workload for modification and system debugging of existing products, low cost and high reliability.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-cost and high-reliability hydrogen circulation module for a fuel cell system, comprising a condensation module (2), a water collection and separation module (4), a drainage valve (5) and a circulation pump (7), characterized in that: The left side of the condensation module (2) is connected to a fuel cell stack water discharge hydrogen outlet (1), the right side of the condensation module (2) is connected to a water collection and separation module (4), a condensation temperature sensor (3) is connected between the condensation module (2) and the water collection and separation module (4), the lower end of the water collection and separation module (4) is connected to a water discharge valve (5), the right end of the water collection and separation module (4) is connected to a circulation pump (7), and the right end of the circulation pump (7) is connected to a fuel cell stack hydrogen inlet (8).

2. A low-cost and high-reliability hydrogen circulation module for a fuel cell system according to claim 1, characterized in that: The condensation module (2) uses a low-power semiconductor refrigeration sheet, a radiator and a cooling fan.

3. The low-cost and high-reliability hydrogen circulation module for a fuel cell system according to claim 1, characterized in that: The water collection and separation module (4) adopts a low-cost water collector.

4. The low-cost and high-reliability hydrogen circulation module for a fuel cell system according to claim 1, characterized in that: The lower end of the drain valve (5) is connected to a water collecting box (6).

5. The low-cost and high-reliability hydrogen circulation module for a fuel cell system according to claim 1, characterized in that: The drain valve (5) is a two-position, two-way normally closed solenoid valve.

6. The low-cost and high-reliability hydrogen circulation module for a fuel cell system according to claim 1, characterized in that: The circulation pump (7) adopts a brushless diaphragm pump with high reliability and long service life.

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