Thermo-economic Analysis Of Methanol Reforming Hydrogen Production-PEMFC Distributed Energy System For Combined Cooling-heating-power Generation

At present,the large-scale use of fossil energy has led to the emission of a large amount of greenhouse gases and other harmful gases to the environment,posing a threat to the sustainable development of society.The use of low-carbon energy to replace fossil energy is an important means to achieve the national strategy of "carbon peaking and carbon neutrality",and it is also an important direction for the development of the current energy industry.In this context,the system integration and optimization of methanol reforming for hydrogen production and Proton Exchange Membrane Fuel Cell（PEMFC）have attracted the attention of researchers.In view of the problems existing in the research of conventional methanol reforming hydrogen production-PEMFC combined cooling,heating and power distributed energy system,the kinetic model of methanol reforming hydrogen production alone is used,the system heat source is not compared,and the later system construction and operation plan is lacking.A new type of methanol reforming hydrogen production-PEMFC combined cooling,heating and power distributed energy system design and system construction and operation scheme based on crowdfunding are proposed,and indicators such as net electricity efficiency,energy utilization efficiency,exergy efficiency and levelized cost of electricity are adopted,and comprehensively analyze the influence of operating parameters,system heat source and crowdfunding mode on the energy efficiency and economy of the system.The main research contents are as follows:Firstly,based on the principles of temperature counterpart and cascade utilization,this thesis integrates the design of a methanol reforming hydrogen production-PEMFC combined cooling,heating and power distributed energy system.The system is heated by the burner subsystem and the trough solar collector subsystem in day mode,and by the burner subsystem in night mode.The methanol steam reforming reaction model,the burner model,the PEMFC model,the lithium bromide absorption refrigeration model and the trough solar collector model are strictly established and verified successively,and the system thermodynamic and economic evaluation indicators are proposed.Secondly,using net electricity efficiency,energy utilization efficiency,exergy efficiency and levelized cost of electricity as the evaluation indicators,the influence of the reforming reaction temperature on the energy efficiency and economy of the system is analyzed,and the direction for system optimization is provided.Under the selected standard operating conditions,from the aspects of energy efficiency,economy and feasibility,methanol combustion and geothermal energy are used as two reference heat sources to compare and evaluate the performance of the distributed energy system using solar energy and methanol combustion as heat sources in this paper.Finally,under the selected standard operating conditions and the use of solar energy and methanol combustion as heat sources,a model of debt crowdfunding model was established,and the 10-year plan was compared with the 15-year plan with evaluation indicators such as the total crowdfunding amount,the total net income of investors and the total net income of enterprises.then,based on the 15-year plan,a sensitivity analysis was carried out on the impact of the monthly flat rate,cold and heating power purchase price,methanol price and heat source on the system operation,and put forward suggestions for the debt crowdfunding model based on the established distributed energy system.