Flat plate type solid oxide electrolytic cell pile with novel sealed structure

Abstract

The invention discloses a flat plate type solid oxide electrolytic cell pile with a novel sealed structure, belonging to the field of hydrogen production by electrolyzing high-temperature steam. The flat plate type solid oxide electrolytic cell pile is formed by the means that a top plate, a base plate and at lest two of flat plate type solid oxide electrolytic cell units are connected with one another in series; each flat plate type solid oxide electrolytic cell unit consists of a metal bipolar plate, a meal sealed frame, a flat plate type solid oxide electrolytic cell piece and a current-collecting mesh; and the electrolytic cell piece is embedded in the meal sealed frame to be sealed and insulated by an inner sealing strip. By improving a seal structure of the pile, the flat plate type solid oxide electrolytic cell pile can be used for separating the outer seal from the inner seal, so that a contact area between the electrolytic cell piece and the adjoining components can be effectively reduced, the thermal stress caused by the thermal expansion coefficient difference of the different components can be reduced, the stability of the electrolytic cell piece can be kept, and the seal effect and the thermal cycle stability of the flat plate type solid oxide electrolytic cell pile can be improved, therefore the flat plate type solid oxide electrolytic cell pile has an important meaning for the development of a high-temperature solid oxide electrolytic cell technology, thereby being used for producing the hydrogen by electrolyzing high-temperature steam on a large scale.

Description

technical field [0001] The invention belongs to the field of hydrogen production by high-temperature water vapor electrolysis, and in particular relates to a flat plate solid oxide electrolytic cell stack with a novel sealed structure. Background technique [0002] The high-temperature solid oxide electrolytic cell is a high-efficiency, low-pollution energy conversion device. Using it to electrolyze water vapor to produce hydrogen is a hot research topic in the energy field at present, and has broad development prospects. The development of high temperature solid oxide electrolytic cell stack technology is the key to its practical application. The operating condition of the high-temperature solid oxide electrolytic cell is a high-temperature environment. For the flat-plate stack, whether the sealing problem at high temperature can be solved is the key issue for the development of this technology. [0003] At present, the sealing requirements of the flat solid oxide electrol...

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Problems solved by technology

[0005] The purpose of the present invention is for the sealing of the flat plate solid oxide electrolytic cell stack in the prior art, when the heat cycle operation is performed, a large mechanical stress will be generated, thereby causing the problem of cracking of the electrolytic cell sheet, and an improved bipolar The plate and sealing frame design can effectively reduce the sealing surface of the electrolytic cell, thereby helping to solve the thermal cycle problem of the flat solid oxide electrolytic cell stack. A new type of sealed structure of the flat solid oxide electrolytic cell stack is proposed. It is characterized in that the flat-type solid oxide electrolytic cell stack with a new sealed structure includes a top plate 1, a bottom plate 7 and at least two flat-type solid oxide electrolytic cell units; 2 to 100 flat-type solid oxide electrolytic cell unit strings Connected to form a flat-plate solid oxide electrolytic cell stack, the first metal bipolar plate 6 of the first-level flat solid oxide electrolytic cell unit is the second metal bipolar plate of the upper-level flat solid oxide electrolytic cell unit 6 Cathode side, the second metal bipolar plate of the first level flat solid oxide electrolytic cell unit 6 Anode side is the first metal bipolar plate of the lower level flat solid oxide electrolytic cell unit 6 Anode side, bottom plate 7 The anode side replaces the anode side of the first metal bipolar plate of the first-stage flat-plate solid oxide electrolytic cell unit, and the cathode side of the top plate 1 replaces the second metal bipolar plate of the last-stage flat-plate solid oxide electrolytic cell unit On the cathode side, use a screw to pass through the bolt holes 8 on the top plate 1 and the bottom plate 7 and use insulating sleeves and insulating gaskets to connect the flat-type solid oxide electrolytic cell units in series to form a stack of flat-type solid oxide electrolytic cells. The anode of the bottom plate 7 The surface is the anode of the flat-plate solid oxide electrolytic cell stack, the cathode surface of the top plate 1 is the cathode of the flat-plate solid oxide electrolytic cell stack, a group of gas inlet and outlet channels 12 parallel to the oxygen flow channel 11 on the bottom plate 7 and each stage of the flat plate The air of the solid oxide electrolytic cell unit is communicated with the oxygen circuit, and the group of gas inlet and outlet channels 12 is the air and oxygen inlet and outlet connected to the flat solid oxide electrolytic cell stack and the outside, and the gas on the bottom plate 7 is perpendicular to the oxygen flow channel 11. The inlet and outlet channels 12 are in communication with the water vapor and hydrogen circuits of each level of flat-plate solid oxide electrolytic cell unit, and the group of gas inlet and outlet channels 12 are the water vapor and hydrogen inlet and outlet connected to the outside of the flat-plate solid oxide electrolytic cell stack;

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