Design And Analysis Of PEM Fuel Cell Combined Heat And Power System

The fuel cell is a power device that directly converts chemical energy in fuel into electrical energy.It has the advantages of high energy conversion efficiency,small footprint,and flexible layout.It has broad application prospects and market space in the future.The fuel cell-based combined heat and power system realizes the power supply and heat supply to users,and at the same time does not emit any pollution products during operation,it has high application and environmental protection value.In this paper,a cogeneration system based on proton exchange membrane fuel cell(PEMFC)is designed,the control strategy of the system under various working conditions is proposed,and simulation analysis is carried out.Finally,the "5kW proton exchange membrane fuel cell cogeneration system" test platform was built to verify the feasibility of the fuel cell cogeneration system designed in this paper.The main work content and conclusions are as follows:(1)A simulation model including the output characteristics and the heat management system of the proton exchange membrane fuel cell was established.On the basis of the simulation results,the steady-state and dynamic output characteristics of the fuel cell were studied and analyzed,and the influence of temperature on fuel cell performance was explored.The simulation results show that the fuel cell model constructed in this paper can effectively reflect the actual operating conditions of the fuel cell.(2)The conventional fuel cell power generation system has been improved,and the heat supply function has been increased while generating electricity.The fuel cell cogeneration system has been constructed.And solved the problem of matching between the stack thermal power and thermal load under the electric load following strategy.The improved stack temperature and cooling mode switching control strategy are designed.while effectively controlling the operating temperature of the stack,the overall energy utilization of the system is improved.(3)The "5kW proton exchange membrane fuel cell cogeneration system" test platform was established,the feasibility of the fuel cell cogeneration system designed in this paper and the accuracy of the fuel cell cogeneration system model was verified by the test results,Provide support for the application of fuel cell cogeneration system.