The invention provides a physically and chemically coupled high-efficiency long-time
energy storage system and method.The physically and chemically coupled high-efficiency long-time
energy storage system comprises an electrolytic tank
hydrogen production
system, a Carnot
cell energy storage circulation system, a fuel
cell power generation system and a Carnot
cell energy release circulation system, and the electrolytic tank
hydrogen production system is used for converting first
electric energy into
hydrogen energy to be stored; the Carnot
battery energy storage circulating system is used for converting the second
electric energy into
heat energy and cold energy for storage; the fuel cell
power generation system is used for generating third
electric energy by utilizing an electrochemical reaction between the hydrogen prepared by the electrolytic tank
hydrogen production system and air, realizing conversion from hydrogen energy to the third electric energy, and combusting residual hydrogen
tail gas and air
tail gas in the electrochemical reaction to release heat so as to generate
combustion heat; and the Carnot
battery energy release circulation system is used for cooling the energy release first air by using the stored cold energy and then compressing the first air to obtain energy release second air, and heating the energy release fourth air by using the
combustion heat and the stored
heat energy and then expanding and doing work to generate fourth electric energy so as to realize conversion from the
combustion heat, the
heat energy and the cold energy to the fourth electric energy. According to the invention, physical and
chemical energy storage technologies are coupled, a large-scale long-time energy storage technology of a Carnot cell is taken as a basic load, an
electrolytic cell and fuel
cell technology is taken as a regulation and control load aiming at source-load side fluctuation, rapid
power consumption and supply are realized, and an efficient and flexible long-time energy storage system is created.