Performance Evaluation And Cost Analysis On A Hydrogen Fueled Compressed Air Energy Storage System With Water Electrolysis Hydrogen Production

With the development of society,the use of fossil energy increases year by year,which leads to the depletion of fossil energy and environmental pollution.The development and utilization of renewable energy has become the main development goal of all countries in the world.In the rapid development of wind power,photoelectric,but also exposed a lot of problems.Wind power and photoelectric power have the disadvantages of intermittency and randomness.When connected to the power grid,it will make the power grid run unstable,so there will be a large number of wind and light abandonment phenomenon.Energy storage technology is considered to be a good solution to these problems.There are many kinds of energy storage technologies,among which compressed air energy storage can carry out large-scale energy storage and has low requirements for geographical location,so it has been widely concerned.This paper will improve the advanced adiabatic compressed air energy storage system by coupling hydrogen fuel.Firstly,on the basis of the compressed air energy storage system,the water electrolysis hydrogen generator device is added,and the proton exchange membrane fuel cell(PEMFC)and solid oxide fuel cell(SOFC)are added respectively.Three systems are proposed:compressed air energy storage power generation system coupled with water electrolysis hydrogen generator,compressed air energy storage power generation system coupled with hydrogen production and proton exchange membrane fuel cells,and compressed air energy storage power generation system coupled with hydrogen production and solid oxide fuel cells.The PEMFC and SOFC have different preheating methods for hydrogen and oxygen fuel.The PEMFC use domestic hot water generated by the system for heating,while SOFC use hydrogen combustion chamber for heating.Then model the compressed air energy storage part and the water electrolysis hydrogen generator device,such as compressor,gas storage chamber,expansion machine,heat exchanger,intercooler and hydrogen combustion chamber,and model the fuel cell.Given the system parameters,the performance indexes of each system were calculated respectively.Among them,the round-trip efficiency and energy storage density of the compressed air energy storage power generation system coupled with hydrogen production and proton exchange membrane fuel cells were the highest,which were 68.79%and 9.45k Wh/m~3.Exergy efficiency of compressed air energy storage power generation system coupled with water electrolysis hydrogen generator reached 79.23%.As for the compressed air energy storage power generation system coupled with hydrogen production and solid oxide fuel cells,the performance of the system was in the middle position,with round-return efficiency,Exergic efficiency and energy storage density of 65.57%,77.21%and 7.18k Wh/m~3,respectively.Then,Exergic loss of the three systems was analyzed respectively to figure out the proportion of exergic loss of major components.It was found that for each system,the exergy loss of water electrolysis hydrogen generator device accounted for the largest proportion.Secondly,the sensitivity analysis of the main parameters of the three systems is carried out.For the compressed air energy storage power generation system with coupled water electrolysis hydrogen generator,the energy consumption of water electrolysis hydrogen generator has the greatest influence on the round-trip efficiency.For the compressed air energy storage power generation system coupled with hydrogen production and proton exchange membrane fuel cells,the energy consumption of water electrolysis hydrogen generator has the greatest influence on the round-trip efficiency of the system.For the compressed air energy storage power generation system coupled with hydrogen production and solid oxide fuel cells,the sensitivity of energy consumption for water electrolysis hydrogen generator is not analyzed,because the increase of energy consumption for water electrolysis hydrogen generator is obvious to the system.The fuel cell operating temperature has the greatest influence on the round-trip efficiency of the system.Finally,the an economic model is established,with net present value as the main performance index.The net present value of the compressed air energy storage power generation system coupled with water electrolysis hydrogen generator is$1,446,210,the compressed air energy storage power generation system coupled with hydrogen production and proton exchange membrane fuel cells is$2,343,788,and the compressed air energy storage power generation system coupled with hydrogen production and solid oxide fuel cells is$2,447,403.