Phychemi dynamics: Study of gas control based on proton exchange membrane fuel cell test system
Proton exchange membrane (PEM) fuel cell is a new type of fuel cell with "conductive ion polymeric membrane" as electrolyte, so that the battery runs in a highly efficient steady state, and has simple hydrothermal management and energy-saving characteristics, can adapt to a wide range of temperature differences, and is widely used in electric vehicles, portable power supplies, aerospace and other fields. Precise control of gas flow is the focus of proton exchange membrane (PEM) fuel cell technology. The 980Pro fuel cell test system is used to carry out gas control research, explore scientific and reasonable control strategies, and then improve the electrochemical performance of fuel cell monomer, which has high scientific research value.
(1) Simulation research based on mathematical modeling
Through the software programming of the fuel cell test system, the PEM fuel cell is accurately modeled from the electrochemical domain, fluid mechanics domain and thermodynamic dynamic domain, which can establish multi-parameter coupling model, current negative/anode flow model, humidification/thermal management model, and study the distribution of various chemical components and current density in the membrane electrode. Compare the operating state under different flow, humidity, temperature and air pressure conditions. Through the correlation test of input/output relationship, the comparison of simulation model and experimental data, the technological innovation scheme is explored.
The 980Pro fuel cell test system has a fast data extraction speed of 5points per second, a checkbox test condition editing screen, easy to fast programming modeling, key data is displayed separately, with safety logic, to ensure battery test stability.
(2) Strategy exploration based on gas distribution
The operation process of fuel cell system is a complex multi-physical field interaction of "gas - water - heat - electricity - force", and the study of gas components is the first. During the start-up of the fuel cell system, high purity hydrogen is supplied to the hydrogen pipeline, and then the stack is electronically loaded to avoid local undergas or serious hydrogen-oxygen interface accidents. Stack gas distribution affects the sufficiency of fuel gas supply of each single cell, and the quality of diffusion layer mass transfer of a single cell determines that the reaction can occur well [1]. The study of "gas ratio" strategy through PEM fuel cell test system is of great significance to explore the safety benefits, energy saving benefits and life expectancy of fuel cells.
The 980Pro fuel cell test system can be applied to gas mixture dynamic ratio (0-100%), preset 98 gas options, and uses NIST traceable calibration certificate gas flowmeters. Switching under different gas media to fully evaluate the performance and operating status of the fuel cell. These advantages will help promote the development and application of fuel cell technology.
(3) Safety system based on gas control
The fuel cell system consists of three gas supply modules: hydrogen supply, oxygen supply and nitrogen supply. The safety system based on gas control is also the focus of the research. Nitrogen purge is an important process. Nitrogen has the advantage of strong inertia, does not react with the underlying material, and the purge process ensures that there is no liquid water in the cathode and anode.
The 980Pro fuel cell test system has the function of "nitrogen purge", the built-in hardware hydrogen sensor, the alarm value can be set on the software (the maximum can be set 40000 ppm), and the preset PID automatic adjustment function can statically control the gas pressure and temperature.