Product-driven heat-balanced direct methanol fuel cell

Abstract

The invention discloses a product-driven heat-balanced direct methanol fuel cell and a working method thereof, the battery comprises a methanol fuel cell body, and a methanol buffer zone, a porous plate and a methanol evaporation zone arranged on an anode side of the methanol fuel cell body, wherein the liquid phase methanol is stably conveyed to the methanol evaporation zone by a pneumatic diaphragm pump driven by an anode product through a carbon dioxide control valve, and the waste heat of the cell is used for heating the methanol evaporation zone through a heat exchange pipeline of the cell. The invention applies the gradual shrinkage and gradual expansion structure to the methanol evaporation region, so that the methanol evaporation process is more energy-saving and efficient. The waste heat generated during the operation of the battery is used to heat the methanol evaporation zone through the battery heat exchange pipeline, and the carbon dioxide, the anode work product of the battery, provides power for the pneumatic diaphragm pump, thus realizing the methanol supply and evaporation process without additional power consumption. Through the accurate control of the heat exchange between methanol working zone and evaporation zone and the supply of carbon dioxide to pneumatic diaphragm pump, the constant flow of methanol vapor is obtained to participate in the cell reaction,and the working efficiency and stability of the methanol fuel cell are improved.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a product-driven heat balance direct methanol fuel cell. Background technique [0002] Fuel cell Direct methanol fuel cell is considered to be one of the most promising mobile power sources for electronic products due to its advantages of simple structure, normal temperature operation, high system volume specific energy, and convenient fuel storage and transportation. It is used in communications, transportation, and national defense. It has a wide application prospect, so it has become a research hotspot of many scholars at home and abroad. [0003] 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. The p...

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Problems solved by technology

[0003] 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

[0004] 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; at the same time, the use of a fuel supply pump for liquid-phase methanol supply will also bring additional power consumption and further reduce battery efficiency

[0005] 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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