Operation method of proton exchange membrane fuel cell based on non-uniformity of physical field distribution

A technology of proton exchange membrane and non-uniformity, which is applied in the direction of fuel cells, fuel cell control, fuel cell additives, etc., can solve the problems of complex mapping relationship process, time-consuming, low efficiency, etc., to improve durability and prolong durability resistance, reducing the effect of local temperature

Active Publication Date: 2022-06-07
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of establishing the mapping relationship between the non-uniformity represented by the cloud map and the operating conditions is relatively complicated, and there are problems of low efficiency and long time consumption

Method used

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  • Operation method of proton exchange membrane fuel cell based on non-uniformity of physical field distribution
  • Operation method of proton exchange membrane fuel cell based on non-uniformity of physical field distribution
  • Operation method of proton exchange membrane fuel cell based on non-uniformity of physical field distribution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The invention adopts the operation of the PEMFC under suitable temperature conditions to optimize, and proposes an operation method based on the non-uniformity of the PEMFC, which is used to optimize the selection of the operation temperature in different current regions when the operating life of the PEMFC is considered. The detailed steps mainly involved in the proton exchange membrane fuel cell operating method based on the non-uniformity of physical field distribution of the present invention are as follows:

[0062] In step 1, a PEMFC experimental test model is prepared, and the PEMFC experimental test model includes a plurality of printed circuit (PCB) boards with the same size and multiple regions. Through the printed circuit (PCB) board to obtain the current density and temperature of the PEMFC operation;

[0063] Step 2: Carry out the polarization curve test. The current density changes as a step function change, from zero to the limit current density. For each...

Embodiment 2

[0084] The steps of Embodiment 2 and Embodiment 1 are basically the same, except that the actual PEMFC model used in the real experiment is not used, but the simulated PEMFC simulation model established by the simulation software.

[0085] The process of establishing the simulation model is as follows:

[0086] Using computational fluid dynamics simulation software, firstly establish a PEMFC model with the same dimensions, materials and parameters as the PEMFC used in the experimental test; use the PEMFC module and user-defined functions in the simulation software to simulate the PEMFC model according to the operating parameters during the experimental test. The polarization curve under the operating parameters is also obtained; the validity of the simulation result is verified by comparing the polarization curve of the experiment and the simulation. If it is within the acceptable error range, proceed to the next step, otherwise, repeat the steps of establishing the simulation ...

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Abstract

The invention provides a proton exchange membrane fuel cell operating method based on the non-uniformity of physical field distribution, comprising the following steps: establishing an experimental model; performing a polarization curve test on the experimental model; adjusting operating conditions; drawing a polarization curve and a power curve; establishing a corresponding The numerical matrix of the physical field distribution is numerically expressed to obtain the size of the PEMFC non-uniformity; under different operating conditions, the relationship between the temperature distribution of the PEMFC and the non-uniformity of the current density distribution with respect to the current density is drawn in the same coordinate system; Draw curves about current density non-uniformity and PEMFC output power, temperature non-uniformity and PEMFC output power; extract corresponding characteristic expressions to calculate PEMFC output power; compare traditional polarization / power curves with non-uniform PEMFC The curve of the output power, and the calculated PEMFC output power, can obtain the optimal operating temperature under different current densities.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a proton exchange membrane fuel cell operating method based on the non-uniformity of physical field distribution. Background technique [0002] For a long time, the international community has paid great attention to the problems of energy shortage and environmental pollution caused by fossil energy consumption, and has gradually developed environmentally friendly and sustainable energy conversion technologies. Proton exchange membrane fuel cell (PEMFC) is a "chemical power generation" device that directly converts chemical energy in raw materials into electrical energy. Its energy conversion efficiency is not limited by the Carnot cycle, and the power generation efficiency of the battery pack can reach 50%. As mentioned above, PEMFC has the characteristics of environmental friendliness, excellent start-up characteristics and high energy conversion efficiency, and is expected ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04992H01M8/04298
CPCH01M8/04305H01M8/04992Y02E60/50
Inventor 张雪霞蒋宇黄磊刘祥荣黄平
Owner SOUTHWEST JIAOTONG UNIV
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