UNIT CELL OF HONEYCOMB-TYPE SOLID OXIDE FUEL CELL BY THE METHOD OF MIXED GAS FUEL CELL, STACK DESIGN USING THEREIT, METHOD TO WORK THE SAME

摘要

In the present invention, a honeycomb SOFC unit cell comprising: a fuel electrode channel having a catalyst for hydrocarbon partial oxidation (oxyreforming), into which a mixed gas of hydrocarbon and air is injected; An anode channel installed independently of the anode channel and having a hydrocarbon inert catalyst and into which a mixed gas of hydrocarbon and air is injected; And an ion conductive solid electrolyte layer formed between the anode channel and the cathode channel. The single cell of the honeycomb SOFC by the MGFC method is further disclosed. The honeycomb type SOFC according to the MGFC method is characterized in that a net-shaped current collector having a pore size having the same size as the pore size of the anode channel and the cathode channel of the battery is installed at the upper end or the lower end of the anode channel and the cathode channel. Disclosed is a stack structure using a single cell, and further comprising the steps of: filling or coating a catalyst powder for hydrocarbon partial oxidation in a cathode channel of a honeycomb SOFC stack structure (S1); Filling or coating a hydrocarbon inert catalyst powder in the cathode channel of the honeycomb SOFC stack structure (S2); And injecting a mixed gas of hydrocarbons and air into the anode channel and the cathode channel at the same time (S3). The method of operating a honeycomb SOFC according to the MGFC method comprises a. In the honeycomb type SOFC according to the unit cell of the honeycomb type solid oxide fuel cell using the mixed gas fuel cell method, the stack structure using the same, and a method of operating the same, in the honeycomb type SOFC, the hydrocarbon and the air mixed gas are directly added to the cathode and the anode. By injecting, it is possible to operate the honeycomb type SOFC battery without the need for gas sealing, and has the advantage of being resistant to thermal shock and easy to stack in the z-axis direction. In addition, it is possible to increase the output density by maximizing the fuel cell reaction area per unit volume, and to improve the conversion of hydrocarbons by the hydrocarbon partial oxidation catalyst charged on the anode side, thereby solving the carbon deposition problem on the anode side. In addition, the catalyst for hydrocarbon partial oxidation formed in the anode side channel can maintain a reducing atmosphere at low temperatures during the heat cycle, thereby minimizing the cell structure change due to oxidation-reduction of the anode. In addition, since the anode channel is formed independently of the cathode channel, anode fuels such as hydrogen and carbon monoxide generated on the anode side can be prevented from mixing with cathode fuel, that is, oxygen, thereby achieving high open circuit voltage and cell performance. In addition, it is possible to reduce the crossover phenomenon between the anode and the cathode than the conventional MGFC-type SOFC stack. In addition, by manufacturing the electrolyte in a honeycomb form, it is possible to use a conventional extrusion process and the like, thereby lowering the manufacturing cost.