Coal gasification solid oxide fuel cell hybrid energy storage power generation system

Abstract

The invention discloses a coal gasification solid oxide fuel cell hybrid energy storage power generation system, and belongs to the technical field of energy storage power generation. The system comprises a coal gasification subsystem, a gas storage subsystem, a heat storage subsystem, a solid oxide fuel cell power generation subsystem and a gas turbine power generation subsystem. In the energy storage stage, the coal-to-gas process is completed by utilizing off-peak electric energy of a power grid load or electric energy generated by intermittent renewable energy sources, and air and synthesis gas are compressed and then stored in a compressed air storage tank and a synthesis gas storage tank. In the energy release stage, compressed air in the compressed air storage tank and compressed synthesis gas in the synthesis gas storage tank are released and supplied to the solid oxide fuel cell power generation subsystem and the gas turbine power generation subsystem. And the heat storage subsystem can carry out gradient storage and gradient utilization on heat energy of different tastes. The system can flexibly operate in different operation modes, is a novel energy storage power generation system, can perform clean utilization on coal, and has the characteristics of high fuel utilization rate, low pollutant discharge and the like.

Description

technical field [0001] The invention relates to a coal gasification solid oxide fuel cell hybrid energy storage power generation system, which belongs to the technical field of energy storage power generation. Background technique [0002] Among many fossil fuels, my country's coal reserves are the largest and the most widely distributed. Coal gasification technology is a key technology to improve coal utilization and reduce coal combustion pollution emissions. [0003] Solid oxide fuel cells can convert the chemical energy of fuel into electrical energy efficiently and environmentally friendly through electrochemical reaction pathways. Moreover, the solid oxide fuel cell is not limited by the Carnot cycle efficiency, and the energy conversion efficiency is higher than that of traditional coal-fired power generation, and the actual energy conversion efficiency can reach 50%-70%. [0004] The current power consumption continues to grow, and the share of renewable energy in ...

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Problems solved by technology

However, general fuel cells use hydrogen-rich gas as fuel, such as natural gas or coal gas. Due to the fact that my country's energy resources are "rich in coal and low in gas", if the energy system using natural gas as fuel is widely promoted, it is not in line with my country's use of coal as the main energy source. national conditions

[0006] Chinese patent CN109356813A discloses a combined system of compressed air energy storage and coal gasification using underground mines. This system needs to use large mines as gas storage chambers, and the coal gasification process is also completed in underground mines. Therefore, due to Restricted by geological conditions, the system cannot be applied on a large scale

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