Solid oxide fuel cell and solid oxide electrolysis cell combined power generation system

Abstract

The invention discloses a solid oxide fuel cell and solid oxide electrolysis cell combined power generation system, which comprises a solid oxide fuel cell stack unit, a solid oxide electrolysis cell stack unit, a solar power supply device, a power converter, a fuel storage tank and corresponding inlet and outlet channels and flow control valves, a CO2 capture storage tank and corresponding inlet and outlet channels and flow control valves, a heat exchanger unit, an air exhaust bypass control valve, an air inlet control valve and an air compressor. By the solid oxide electrolysis cell stack unit, CO2 and H2O can be converted into fuel gases CH4, H2 and the like by externally supplied electric energy (for example, solar energy and the like) in a high-pressure environment, so that fuel exhaust and air exhaust discharged from a solid oxide fuel cell are introduced into an electrolysis cell; reaction is carried out by the solar power supply device to generate a new fuel gas; and the new fuel gas is introduced into a fuel cell stack again for power generation.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a combined power generation system of a solid oxide fuel cell (SOFC) and a solid oxide electrolytic cell (SOEC). , so as to improve the system efficiency and realize the recycling system of carbon elements. Background technique [0002] A solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) is a device that can convert chemical energy in hydrocarbons into electrical energy through an electrochemical reaction, and usually works at 600-800°C. It has the advantages of high efficiency, no pollution, quietness, etc., and is known as one of the most promising green power generation technologies in the 21st century. Among them, planar SOFC has become the mainstream of SOFC technology application due to its advantages of high energy ratio and easy assembly. [0003] SOFC mainly uses hydrocarbons as fuel for its power generation, such as methane, hydrogen, etc. Among them...

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Problems solved by technology

[0004] The current research on SOFC power generation systems mainly focuses on how to better control the performance of the system, improve the efficiency of the system, and achieve faster and safer power tracking, etc., but has not done more about the CO2 in the exhaust gas emitted by the system. The treatment is simply discharged into the atmosphere. In this way, when the SOFC power generation system is used on a large scale, the exhaust gas will aggravate global warming and cause the greenhouse effect

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