SOLID OXIDE FUEL CELL OR SOLID OXIDE ELECTROLYZING CELL AND METHOD FOR OPERATING SUCH A CELL

摘要

A method for operating a solid oxide fuel cell having cathode-anode-electrolyte units, each including a first electrode for an oxidizing agent, a second electrode for combustible gas, and a solid electrolyte there between forming a metal interconnection between the CAE-units. The interconnect including a combustible gas distribution structure, and a second metallic gas distribution element having two channels for the oxidizing agent and separate channels for a tempering fluid. Cooling the second gas distribution element and a base layer of the first gas distribution element with the tempering fluid (O2). Measuring the first and second control temperatures T1 and T2. T1 being the tempering fluid temperature entering the fluid inlet side of the fuel cell. T2 being the tempering fluid temperature leaving the second gas distribution element. Where the amount of tempering fluid supplied to the second gas distribution element is controlled based on the difference between T1 and T2.

主权项

1. A method for operating a solid oxide fuel cell or a solid oxide electrolyzing cell, the solid oxide fuel cell having: a) a plurality of cathode-anode-electrolyte units, each CAE-unit including a first electrode for an oxidizing agent, a second electrode for a combustible gas, and a solid electrolyte between the first electrode and the second electrode, and b) a metal interconnect between the CAE-units, the interconnect including: a first metallic gas distribution element comprising a gas distribution structure for the combustible gas, and a second metallic gas distribution element comprising channels for the oxidizing agent and comprising separate channels for a tempering fluid, wherein the channels split the oxidizing agent (O) into two flow paths (O1, O2),), a channel for an oxidizing agent (O1) and a channel for a tempering fluid (O2), the method comprising:
introducing a tempering fluid (O2) which contacts and cools the second gas distribution element and a base layer of the first gas distribution element, contacting the first electrode of an adjacent CAE-unit with an oxidizing agent (O1), measuring at least a first and a second control temperatures (T1, T2), where the first temperature (T1) being the temperature of the tempering fluid (O2) entering the second gas distribution element or any representative temperature measured on the tempering fluid inlet side of the fuel cell, the second temperature (T2) being the temperature of one of: the exit temperature of the tempering fluid leaving the second gas distribution element, the temperature of the fuel cell stack, representative temperature measured on the tempering fluid outlet side of the fuel cell, and controlling the amount of tempering fluid (O2) supplied to the second gas distribution element based on a temperature difference between the first and second temperature (T1,T2).