Material separation heat balance direct methanol fuel cell and working method thereof

Abstract

The invention discloses a material separation heat balance direct methanol fuel cell and a working method thereof. A methanol delivery pipeline and a carbon dioxide flow path are independently arranged; an anode product carbon dioxide is directly discharged through the carbon dioxide flow path after being generated, so that the mixing of carbon dioxide and the methanol vapor is reduced, the utilization rate of the methanol vapor is increased, and meanwhile carbon dioxide collection and utilization are facilitated; after the methanol vapor is generated, the methanol vapor directly enters a membrane electrode to participate in the reaction, so that the additional power consumption is reduced; the waste heat generated in the operation process of the cell is used for heating a methanol evaporation area through a methanol evaporation heat exchange pipeline, and the cell anode working product carbon dioxide provides power for a pneumatic diaphragm pump, so that the methanol supply and evaporation process is realized on the premise of no extra power consumption; and the working efficiency and the stability of the methanol fuel cell are improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a material separation heat balance direct methanol fuel cell and a working method thereof. Background technique [0002] Direct methanol fuel cells are considered to be one of the most promising mobile power sources for electronic products due to their advantages such as simple structure, normal temperature operation, high system volume specific energy, and convenient fuel storage and transportation. Therefore, it has become a research hotspot of many scholars at home and abroad. The electrode and cell reactions of a direct methanol fuel cell are as follows: [0003] The anode reaction is CH 3 OH+H 2 0→6H + +6e - +CO 2 [0004] The cathode reaction is 3 / 2O 2 +6H + +6e - →3H 2 o [0005] The total reaction of the battery is CH 3 OH+3 / 2O 2 →2H 2 O+CO 2 [0006] At present, most of the research on direct methanol fuel cells is concentrated in the field of using l...

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Problems solved by technology

[0006] At present, most of the research on direct methanol fuel cells is concentrated in the field of using liquid methanol as fuel, but because most of the fuel supply of methanol fuel cells needs to be mixed with water, this reduces the energy density of the fuel, and at the same time there is serious methanol in the process of operation. Penetration problem, while causing a lot of waste of raw materials, reduces the energy utilization rate and seriously weakens the performance of the battery, which brings great difficulties to the improvement of the performance of methanol fuel cells

[0007] Studies have shown that methanol participating in the fuel cell reaction in the form of vapor can reduce methanol breakthrough and further improve the utilization efficiency of methanol. However, the fuel supply method of the battery using methanol vapor as fuel is mostly in the form of evaporation film evaporation and heating by external heating equipment. Evaporation mode, in which the evaporation mode of the evaporation film makes the flow of methanol cannot be accurately controlled during use, which further affects the stable operation of the fuel cell, and the external heating device heating evaporation mode increases the extra power consumption of the battery operation, further reducing the battery life. Efficiency; the use of a fuel supply pump for liquid-phase methanol supply will also bring additional power consumption and further reduce battery efficiency

At the same time, during the working process of the battery using methanol vapor as fuel, there are often problems such as uneven distribution of methanol concentration on the anode side, insufficient methanol reaction, and difficulty in discharging carbon dioxide, which greatly affects the working efficiency of the fuel cell.

[0008] Therefore, in view of the aforementioned low efficiency, difficult distribution, and easy leakage of methanol fuel cells, a methanol fuel cell with high working efficiency, strong control precision, and no need for additional power consumption is urgently needed.

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