Fuel cell carbon monoxide poisoning recovery device and method with gas mixing function

Abstract

The invention provides a fuel cell carbon monoxide poisoning recovery device with a gas mixing function and a method. A group of gas one-way valves and gas mixers with pressure adjusting modules, flow adjusting modules, gas one-way valves and gas mixers are additionally arranged on a gas supply path of a fuel cell to mix gas. In the running process of the fuel cell, after performance reduction caused by carbon monoxide poisoning of the cell is found, the module is started, the gas mixing module monitors the pressure and flow of mixed gas, it is ensured that recovery gas stably enters a gas supply pipeline of the fuel cell to be evenly mixed, and the gas recovery efficiency is improved. The pressure adjusting module and the gas mixing module can set different volumes of gas passing through the pipelines according to the types of the mixed gas, and the purpose of accurate control is achieved. If other special tests needing mixed gas need to be carried out, the concentration or the type of the running gas supply can be adjusted through the module, so that the experiment purpose is achieved.

Description

Technical field:

[0001] The invention belongs to the technical field of fuel cell testing, and in particular relates to a fuel cell carbon monoxide poisoning recovery device and method with a gas mixing function. Background technology:

[0002] As a highly efficient, environmentally friendly and low-noise energy conversion technology, proton exchange membrane fuel cells have become an important development direction in the future energy field against the backdrop of growing energy demand and increasing awareness of environmental protection.

[0003] Among them, membrane electrode is one of the key technologies of fuel cells. Membrane electrode containing platinum catalyst is widely used in the market as a key component of fuel cells. In the process of methanol to hydrogen, hydrogen, carbon dioxide and a small amount of carbon monoxide will be produced. Carbon monoxide is adsorbed on the surface of platinum catalyst and occupies the active position of platinum surface required for hydrogen oxidation. During the operation of fuel cell, it will be affected by carbon monoxide, resulting in a sharp decline in battery performance. This phenomenon is called catalyst poisoning. Even if a small amount of carbon monoxide enters the fuel cell with hydrogen, poisoning will quickly occur.

[0004] According to experiments, adding a small amount of oxygen into the hydrogen supply pipeline of the fuel cell can accelerate the rapid oxidation of carbon monoxide on the platinum catalyst, which is called the blood oxygen method. This method can effectively and quickly improve the carbon monoxide poisoning phenomenon of the fuel cell. Therefore, how to efficiently and stably mix the gas is the key to this technology. Summary of the invention:

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a fuel cell carbon monoxide poisoning recovery device and method with a gas mixing function, by connecting oxygen with a suitable flow rate and pressure to the fuel cell gas supply path, accelerating carbon monoxide oxidation to alleviate membrane electrode poisoning and improve fuel cell performance.

[0006] The present invention provides a fuel cell carbon monoxide poisoning recovery device with a gas mixing function, which comprises: an oxygen gas source, a pressure regulating module, a flow regulating module, a gas one-way valve, and a gas mixer are connected in sequence, a pressure regulating module is arranged at the oxygen gas source, a hydrogen concentration monitoring and alarm device is arranged between the flow regulating module and the gas one-way valve, an electronic valve K1 and an exhaust channel are connected at the flow regulating module, and a gas mixer is connected to the gas flow direction of the one-way valve and a gas supply pipeline of a fuel cell testing system is connected.

[0007] Furthermore, when the fuel cell system does not give a corresponding valve opening instruction, the electronic valve K1 is in a closed state.

[0008] The present invention also provides a method for recovering from carbon monoxide poisoning in a fuel cell with a gas mixing function. Based on the above-mentioned device for recovering from carbon monoxide poisoning with a gas mixing function, the method comprises:

[0009] When the fuel cell is contaminated by carbon monoxide during operation, causing the battery performance to drop sharply, turn on the gas mixing device, connect the oxygen source, set the oxygen flow rate and pipeline pressure, and when the mixed gas is passed into the gas supply pipeline, observe the recovery of the fuel cell performance and adjust the oxygen concentration appropriately.

[0010] Furthermore, the pressure regulating module connected to the oxygen gas source in the above device includes a pressure gauge and a pressure reducing device, which adjusts the appropriate gas pressure to the flow regulating module, and feeds back a signal to the fuel cell testing system when the gas source pressure is lower than a certain set value.

[0011] The one-way valve provided in the present invention can effectively prevent the gas in the gas supply pipeline from flowing into the equipment, and prevent the gas supply gas and the gas to be mixed from reacting prematurely in the pipeline and causing deviation in the test data.

[0012] Furthermore, after the fuel cell test system is shut down, a feedback signal is sent to the flow and pressure regulating module, the flow drops to zero, the pressure drops to normal pressure, and the electronic valve K1 opens to exhaust the excess gas in the pipeline.

[0013] Furthermore, when the hydrogen concentration monitoring and alarm device detects that the hydrogen content in the pipeline exceeds the set safety value, it feeds back a signal to the flow and pressure regulating module, the flow drops to zero, the pressure drops to normal pressure, and the electronic valve K1 opens to exhaust the excess gas in the pipeline.

[0014] Furthermore, a concentration sensor is provided on the connection channel between the one-way valve and the gas supply pipeline for measuring the concentration of the mixed gas.

[0015] Compared with other prior arts, the present invention has the following beneficial effects:

[0016] The mixed gas is not limited to the mixture of hydrogen and oxygen. The oxygen source can be replaced with other gases as the gas source. For example, when simulating the reduction of the supply gas concentration, inert gases such as nitrogen can be connected as a mixed gas source to achieve the desired purpose of the test.

[0017] The present invention provides a fuel cell carbon monoxide poisoning recovery device and method with a gas mixing function, which comprises an oxygen gas source, a pressure regulating module, and a flow regulating module. During the operation of the fuel cell system, by controlling the flow and pressure of the oxygen gas source, the performance of the membrane electrode contaminated by carbon monoxide can be restored without the need to operate the fuel cell at a high current for a long time. At the same time, it also solves the problem that the current fuel cell system does not have the gas mixing and regulation functions. Description of the drawings:

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the structure of the gas pressure regulating module;

[0020] Figure 2 This is a schematic diagram of the gas flow adjustment module structure;

[0021] Figure 3 A schematic diagram of a fuel cell carbon monoxide poisoning recovery device with a gas mixing function according to an embodiment of the present invention

[0022] Among them, the figures are marked as: 101-first pipeline pressure sensor, 102 second pipeline pressure sensor, 103-pressure reducing valve, 201-first gas flow meter, 202-second gas flow meter, 203-gas flow controller, 301-exhaust pipeline electronic valve K1, 302-exhaust pipeline, 303-check valve. Specific implementation method:

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] like Figure 3As shown, the present invention embodies a fuel cell carbon monoxide poisoning recovery device and method with a gas mixing function, comprising:

[0026] The gas source, pressure adjustment module, flow adjustment module, one-way valve and gas mixer are connected in sequence, an exhaust channel with an electronic valve K1 is connected to the flow adjustment module, and a hydrogen flow monitoring and alarm device is connected to the one-way valve and the flow adjustment module.

[0027] Based on the above structure, connect the oxygen gas source, monitor the gas source pressure according to the first pressure sensor to avoid affecting the pressure balance inside the pipeline, adjust the pressure reducing valve, and monitor the second pressure sensor at the same time to adjust the gas output pressure to a pressure suitable for mixing.

[0028] Set the hydrogen alarm concentration of the hydrogen monitoring and alarm module, and connect the electronic valve K1 signal to the fuel cell test system.

[0029] When the device is connected to a fuel cell system, when the system detects that the fuel cell performance has declined due to carbon monoxide contamination, the device starts and can set the oxygen mixing ratio according to the amount of gas required under the current density of the fuel cell. The recovery time of the fuel cell will vary with different oxygen mixing concentrations.

[0030] When the hydrogen monitoring and alarm module detects that the hydrogen concentration exceeds the set value, a feedback signal is sent to the flow control module. After receiving the signal, the flow control module closes, the gas flow rate is zero, and a signal is transmitted to the electronic valve K1 to discharge the excess unmixed gas in the pipeline.

[0031] After the fuel cell system stops running, a feedback signal is sent to the flow regulating module. After receiving the signal, the flow regulating module is closed, the gas flow rate is zero, and a signal is transmitted to the electronic valve K1 to discharge the excess unmixed gas in the pipeline.

[0032] 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 with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fuel cell carbon monoxide poisoning recovery device and method with gas mixing function, characterized in that: include: The oxygen gas source, pressure regulating module, flow regulating module, gas one-way valve and gas mixer are connected in sequence, a hydrogen concentration monitoring and alarm device is arranged between the flow regulating module and the gas one-way valve, the flow regulating module is connected to the electronic valve and the exhaust channel, and the gas mixer is connected to the gas supply pipeline of the fuel cell test system.

2. The flow regulating module according to claim 1, characterized in that: The gas volume is calculated according to the type of gas, the gas flow is adjusted, the resistance of the mixed gas to the fuel cell gas supply path is reduced, and the impact of gas fluctuations in the main gas supply pipeline on the fuel cell performance is reduced when the gas is introduced.

3. According to the requirements of claim 1, a pressure regulating module is connected to the oxygen gas source to monitor the gas source pressure, and the gas source is replenished or replaced in time when the gas source pressure is too low.

4. According to claim 1, the exhaust pipeline flow regulating module is connected to the electronic valve and the exhaust channel. After the electronic valve receives the start signal of the hydrogen concentration monitoring alarm module and the shutdown of the fuel cell system, the electronic valve opens to exhaust the excess gas in the pipeline.

5. The hydrogen concentration monitoring and alarm module according to claim 1, claim 2, and claim 4 is characterized in that: When the monitored concentration exceeds the set value, it is directly fed back to the flow regulation module and the electronic valve of the exhaust pipeline, directly stopping ventilation and exhausting the residual gas in the pipeline.

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