The Design Of Steam Reforming Of Natural Gas System And Experimental Research Of The PEMFC

Shortages of energy sources, single energy consumption configuration and badly polluted environment have become important society problems of nowadays. As a kind of clean, high efficient, low-cost of power generation technology, fuel cell using hydrogen will improve the configuration and efficiency of energy sources and the environment.This paper brings forward a design of the small-scale system of hydrogen production. The system is applied to supply hydrogen for the 1～3kW PEMFC stack. The system adopts the design of integrating catalytic combustion with steam reforming, combining with high efficiency heat exchange technology that is multi-medium integrative mode. This makes the distribution of equipment more compact. At the same time, the heat utilization efficiency of system is greatly improved. Based on thermal calculations, the technology and structure of system is optimized, and a small-scale hydrogen production system from the nature gas for PEMFC is established. This will promote the research on miniaturization of hydrogen production system from the nature gas. In this system, catalytic combustion device is placed in the cavity of hydrogen production tank. The effect of catalytic combustion is the key factor of the feasibility and safety in this system. Therefore, the pre-catalytic combustion experiments are quite necessary. Experiment results indicate that the catalytic combustion technology can provide enough heat and safety for the reforming of the nature gas.Understanding of the characteristics of fuel cell is of great significance to the quite stable efficient economic natural gas fuel cell power generation system. A heat and humidifying equipment is designed to analyse the effect on the performance of PEMFC. Effcet on performance of PEMFC of parameters such as temperature, pressure and etc are studied. The results shows that the higher temperature and pressure, the better the performance of PEMFC; the excessive air factorλshould be maintained among 2～3; under the condition of non-humidification of reactant gas, PEMFC has an optimal work temperature. Once the temperature exceed, its performance declines; it has great diffience between the performance of PEMFC in non-humidification condition and in humidification condition; Under the condition that P is 0.2MPa,T is 67℃,λis 2.5, the performance of PEMFC is best, and the largest load is 850W. The above-mentioned results provide some basic data for the improvement of the technology of fuel cell power generation.