Solid oxide fuel cell device

Abstract

A solid oxide fuel cell device that prevents the temperature inside a fuel cell module from rising excessively during a startup step is provided. During the startup step, a control unit: controls the supply volumes of fuel gas, oxidant gas, and steam supplied to a reformer (20), based on the temperature of a cell stack and the temperature of the reformer; moves the solid oxide fuel cell device through a POX step, an ATR step, an SR step and then to a power generation step; and is configured to control such that the solid oxide fuel cell device moves to the next step when the cell stack temperature and the reformer temperature in each step fulfill move conditions set for each. When the control unit (110) finds that there is a risk of temperature increase, the control unit controls the solid oxide fuel cell device so as to move to the next step with the fuel gas supply amount reduced compared to when a risk of temperature increase is not found.

Description

technical field [0001] The present invention relates to a solid oxide fuel cell device, and more particularly to a solid oxide fuel cell device that prevents excessive temperature rise of a reformer and the like during start-up. Background technique [0002] Conventionally, a solid oxide fuel cell device (SOFC) is configured to pass through a plurality of steps of reforming fuel gas in a reformer in a start-up step, that is, a partial oxidation reforming reaction step (POX step), an automatic Thermal reforming reaction process (ATR process), steam reforming reaction process (SR process), and transfer to power generation process (for example, refer to Patent Document 1). [0003] In the SOFC, by sequentially performing the above steps, the temperature of the reformer, the fuel cell stack, and the like arranged in the fuel cell module housing chamber can be raised to the operating temperature. [0004] Furthermore, the operating temperature of SOFC is as high as 600 to 800° C...

AI Technical Summary

Problems solved by technology

As a result, during the restart operation, the temperature of the reformer rises at a higher rate than that during the normal start operation, which may cause an excessive temperature rise that exceeds the predetermined operating temperature.

Furthermore, there is a possibility that the reformer may be deteriorated or damaged due to the excessive temperature rise.

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