Flat-plate solid-oxide fuel battery stack for double-layer connector

Abstract

The invention relates to a solid oxide fuel battery stack for a flat plate for a double-layer connecting body, comprising a connecting body and a plurality of single batteries formed by an anode, an electrolyte layer and a cathode. The plurality of the single batteries are arranged in the way that the anode of one piece of single battery is over against the anode of another single battery, and the cathode of one piece of the single battery is over against the cathode of another single battery. The connecting body is a double-layer connecting body formed by a first connecting body and a second connecting body, cross rods of the first connecting body and the second connecting body are arranged in a staggered way, and the gas flows in a winding way after the cross rods are perturbed. The solid oxide fuel battery stack can perturb fuel gas and the oxidized gas from the plane perpendicular to the single battery, and effectively increase the concentration of the fuel gas of the solid oxide fuel battery stack close to the side of the anode and the oxidized gas concentration of the solid oxide fuel battery stack close to the side of the cathode so as to intensify mass transfer; and the reaction interfaces on two sides are respectively formed in an anode gas duct and a cathode gas duct, thereby sufficiently utilizing the fuel gas and the oxidized gas and greatly increasing the power density of the flat plate typed solid oxide fuel battery stack.

Description

technical field [0001] The invention relates to a solid oxide fuel cell (SOFC), in particular to the structure of a double-layer connector flat solid oxide fuel cell stack. Background technique [0002] Petroleum prices continue to rise, and the prospect of fossil energy is not optimistic. The energy and resource crisis has long become the primary problem facing countries all over the world. Improving the efficiency of the energy system and developing efficient energy-saving new technologies are one of the research goals of researchers in the Department of Energy and Dynamics. Fuel cells are secondary energy devices that solve the dual problems of low energy utilization efficiency and environmental pollution. Solid oxide fuel cell (SOFC) has outstanding characteristics such as strong fuel applicability, high energy utilization rate, and no need for noble metal catalysts, so it has received more and more attention. In the field of stationary power plants, solid oxide fuel ce...

AI Technical Summary

Problems solved by technology

Usually, the oxidizing gas and fuel gas in the SOFC stack are mostly in a laminar flow state. Taking the fuel gas side as an example, the fuel gas concentration on the anode reaction interface is low, while the fuel gas concentration far away from the anode side is high but cannot participate in the anode reaction. make full use of

Similarly, on the oxidizing gas side, the concentration of oxidizing gas far away from the cathode side is high and cannot participate in the cathode reaction, and cannot be fully utilized

Such a structure leads to a large concentration difference between the fuel gas and the oxidizing gas on the plane perpendicular to the single cell, and the concentration polarization is high, which reduces the performance of the SOFC stack.

[0006] The existing planar SOFC stacks have a large concentration difference between fuel gas and oxidizing gas on the plane perpendicular to the single cell. Although SOFC stack structures disclosed in some patents use trough structures or corrugated structures to enhance mass transfer, these structures can only Disturb the fuel gas and oxidizing gas from the plane parallel to the single cell, but cannot disturb the fuel gas and oxidizing gas from the plane perpendicular to the single cell with a large concentration difference; cannot effectively enhance mass transfer, and cannot effectively improve the anode side reaction Fuel gas concentration at the interface and oxidant gas concentration at the reaction interface on the cathode side

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