Design And Application Study Of Methanol Fuel Processing System For PEMFC

With the massive consumption of fossil energy and the resulting increase in environmental pollution,people are forced to change the existing way of energy utilization.As an environmentally friendly and efficient renewable energy,hydrogen energy is expected to replace fossil energy in the future and has attracted wide attention.Proton exchange membrane fuel cell(PEMFC)is suitable for the power source of mobile occasions such as automobiles because of its high efficiency,low working temperature and high power density.However,the low hydrogen storage density of high-pressure cylinders used at present limits the further promotion of fuel cells.On-site hydrogen production uses hydrocarbons to produce hydrogen,which has high energy storage density and avoids the transportation of hydrogen and is expected to achieve breakthroughs in hydrogen supplyment for fuel cells.In this thesis,a fuel processing system based on "methanol steam reforming + CO selective methanation + methanol catalytic combustion" for LT-PEMFC was designed.The main contents of this paper are as follows:1)The reactions of the fuel processing system was thermodynamiclly analyzed and the catalyst for each reaction was tested.The process of the system was proposed and a simulation model was set up to balance the energy and meterial in the system.2)Based on the reactor integrating methanol steam refonning,CO selective methanation and methanol catalytic combustion,a fuel processing system was built.The hardware structure of the PLC control system is designed and the control algorithm is developed to achieve the automatic control of the system.3)The performance of the fuel processing system was evaluated through experiments.The start-up and steady-stage behavior of the system under different conditions was studied and the parameters were optimized to reduce the methanol consumption during the start-up time and improve the efficiency of the system.Finally,the dynamic response characteristics and stability of the system were tested.4)The fuel processing system was used to supply hydrogrn for a LT-PEMFC system.The experimental device was modified to improve the power and energy efficiency of the system.Finally,the stability and energy efficiency of the entire system were examed experimentally.