Solid Oxide Fuel Cell Device

Abstract

The present invention provides a solid oxidizer capable of eliminating the temperature unevenness of the fuel cell module, ensuring the evaporation performance of water in the evaporator, and improving the heat exchange performance in the heat exchanger, thereby realizing effective temperature rise at startup Physical fuel cell device. Specifically, the solid oxide fuel cell device has: a plurality of fuel cell units; a module case for accommodating the plurality of fuel cell units; a heat insulating material provided to cover the periphery of the module case; a reformer , which uses water vapor to reform the raw fuel gas to generate fuel gas; the combustor, which burns the residual fuel gas to heat the reformer; the heat exchanger, which exchanges heat between the oxidant gas and the exhaust gas; and the evaporator , disposed inside the heat insulating material and outside the module case, heat exchange is performed between the exhaust gas and water immediately after the heat exchange in the heat exchanger to generate water vapor.

Description

technical field [0001] The present invention relates to a solid oxide fuel cell device, in particular to a solid oxide fuel cell device in which an evaporator is provided outside a module case for accommodating a plurality of fuel cell cells. Background technique [0002] Solid Oxide Fuel Cell (Solid Oxide Fuel Cell: hereinafter also referred to as "SOFC") device uses an oxide ion conductive solid electrolyte as an electrolyte, installs electrodes on both sides, supplies fuel gas on one side, and supplies fuel gas to the other side. A fuel cell that supplies oxidant gas (air, oxygen, etc.) to one side and operates at a relatively high temperature. [0003] Japanese Unexamined Patent Application Publication No. 2012-221659 (Patent Document 1) describes a single-cell burner type solid oxide fuel cell device in which a plurality of fuel cell cells are arranged in a module case, and these Above the plurality of fuel cells, the remaining fuel gas (surplus gas) that is not used f...

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Problems solved by technology

[0006] However, in the configuration described in Patent Document 1 in which the heat exchanger is provided downstream of the evaporator, since a large amount of heat of the exhaust gas is taken away from the upstream evaporator, the heat exchanger on the downstream side The heat exchange performance (heat recovery performance) of the heat exchanger is reduced, so that the temperature of the oxidant gas cannot be properly raised in the heat exchanger

Therefore, the operating temperature of the solid oxide fuel cell device at the time of start-up cannot be raised rapidly, and it takes time to raise the temperature at the time of start-up.

In addition, when trying to speed up the temperature rise at the time of starting, it is necessary to introduce more surplus gas for heat self-sufficiency, etc., and there is a tendency to increase the operating cost of the solid oxide fuel cell device.

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