Energy storage and conversion system based on solid oxide cells

Abstract

A solid oxide cell (SOC) system composed of a solid oxide fuel cell (SOFC) and a solid oxide electrolysis cell (SOEC) produces water while generating power in an SOFC working mode, water reacts with a nanocrystalline metal on a carrier to produce hydrogen, and the hydrogen is supplied to the SOFC for working; and in an SOEC working mode, the water is electrolyzed by the electric energy from a solar wind energy cell to produce the hydrogen, the hydrogen reacts with the nanocrystalline metal on the carrier to produce water, and the water is supplied to the SOEC for electrolysis. As the metal and a metallic oxide are used as intermediate conversion material to recycle the fuel, so that the fuel does not need to be frequently injected, the purpose of continuous seal is achieved, and meanwhile the phenomenon that the fuel is loaded for multiple times to cause a lot of impurities to lead to damage to the cells is avoided.

Description

technical field [0001] The invention belongs to the technical field of energy utilization, and relates to an energy storage and conversion system based on a solid oxide battery, in particular to a system for realizing energy storage and conversion of a solid oxide battery through conversion of metal and metal oxide. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an effective device that has been invented to directly convert chemical fuel into electrical energy. It is composed of solid oxides made of ceramics and has the advantages of high efficiency, modularity, easy site selection, and low emissions. The solid oxide electrolytic cell (SOEC) is the reverse operation of the solid oxide fuel cell, and it is a high-efficiency, low-pollution energy conversion device that converts electrical energy and thermal energy into chemical energy. Due to the advantages of high energy conversion efficiency, all solid state, modular assembly, and zero pollution, solid oxide f...

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Problems solved by technology

[0003] Wind energy and solar energy are renewable and clean energy, and they are effective substitutes for fossil energy such as coal, oil, and natural gas. The amount of light radiation changes, and the amount of power generation is unstable

The existing technology proposes to use SOEC to convert wind energy and solar energy into stable chemical energy storage, and then use SOFC to convert chemical energy into electrical energy output, so as to improve the current situation that is difficult to use due to the instability of wind energy and solar energy

[0004] However, in the prior art, the SOFC and SOEC systems are separated, and each needs to feed gas to maintain its operation, which increases the cost of gas preparation and storage, and it is difficult to achieve real and complete system coupling, and the SOFC is continuously fed with fuel (H 2 、CH 4 etc.) in the anode reaction, there are problems such as incomplete sealing and fuel impurities, which may easily cause fuel cell failure and damage

For example, sulfur, a common impurity in fuel, if its content reaches 1%, SOFC cannot operate normally

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