Solid oxide fuel cell power generating system and cell stack thereof

Abstract

The invention discloses a cell stack. The cell stack comprises double-sided runner plates, cell substrates, an air dispersion cavity and a tail gas mixing burning cavity, wherein the upper surface and the lower surface of each double-sided runner plate are respectively provided with an air runner and a fuel gas runner, the cell substrates and the double-sided runner plates are alternately laminated, one cell substrate is arranged between two adjacent double-sided runner plates, the double-sided runner plates and the cell substrates are respectively provided with a fuel gas inlet penetrating through the double-sided runner plates and the cell substrates, the air dispersion cavity and the tail gas mixing burning cavity are respectively formed on two sides of the double-sided runner plates, the fuel gas runner extends from the fuel gas inlet to the tail gas mixing burning cavity, and the air runner extends from the air dispersion cavity to the tail gas mixing burning cavity. By adopting the cell stack, the structure is simplified, the natural gas inlet resistance is reduced, and the heat radiation loss of a pipeline can be reduced. The invention also discloses a solid oxide fuel cell power generating system with the cell stack.

Description

technical field [0001] The invention relates to the technical field of battery power generation systems, in particular to a battery stack of a solid oxide fuel cell power generation system with a relatively simple structure. The present invention also relates to a solid oxide fuel cell power generation system having the above cell stack. Background technique [0002] Solid oxide fuel cell is a new type of power generation device, which belongs to the third generation of fuel cell. power generation device. As the technology of solid oxide fuel cells continues to mature, it is generally considered to be a fuel cell that will be widely popularized and applied. [0003] The solid oxide fuel cell is mainly composed of an anode, a cathode and a solid oxide electrolyte. The anode is the place where the fuel is oxidized, and the cathode is the place where the oxidant is reduced. Both electrodes contain catalysts that accelerate the electrochemical reaction of the electrodes. The ...

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Problems solved by technology

[0007] The above-mentioned solid oxide fuel cell stack has two holes, which are the fuel gas inlet and the fuel gas outlet respectively, that is, the exhaust gas needs to be exported to the hot zone system for combustion and then introduced into the hot zone heating system, resulting in solid oxide fuel cell power generation system pipelines Complicated, which leads to greater resistance to natural gas intake. If ordinary urban pipelines are used to enter natural gas, a booster pump is required to boost the pressure, and the heat dissipation loss of the pipeline is large.

[0008] On the other hand, the above-mentioned solid oxide fuel cell stack still has the following problems: first, the exhaust gas heat exchange is close to the hot zone, the heat exchange efficiency is not high, and the waste heat utilization rate is low; Vertical expansion, but horizontal expansion is relatively limited and difficult; third, the solid oxide fuel cell stack array is a series structure, and the battery stacks are connected in parallel after series. If a battery stack is damaged (usually the damage will cause the internal circuit break of the stack), it can cause A string of stacks connected in series cannot output current, and the reliability is not high; fourth, the height of the vertical array of battery stacks will change during the heating process from low temperature to high temperature, and the gas pipeline needs to expand and contract accordingly, while the vertical gas distribution plate The existing pipelines in the room are connected by corrugated metal pipes, the actual production and installation are cumbersome and the reliability is low

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