Solid oxide fuel cell system and starting method thereof

Abstract

The invention discloses a solid oxide fuel cell system and a starting method thereof. The starting method of the solid oxide fuel cell system comprises the following steps: heating air; heating fuel;and making heated air and fuel enter a fuel cell stack to complete preheating, wherein the step of heating fuel comprises the following specific step: heating fuel with a first heater, and the first heater is connected in series with a fuel reformer; and/or the step of heating air comprises the following specific step: heating air with a second heater, and the second heater is connected in serieswith an air heater. Through adoption of the starting method of the solid oxide fuel cell system disclosed by the invention, the heating speed of the fuel and/or air can be increased, thereby increasing the preheating speed of the fuel cell stack, and shortening the starting time of the solid oxide fuel cell system.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, and more specifically, to a solid oxide fuel cell system and a starting method thereof. Background technique [0002] A solid oxide fuel cell is an all-solid-state chemical power generation device that directly converts the chemical energy in the fuel into electrical energy through an electrochemical reaction under medium-high temperature conditions. Such as figure 1 As shown, the solid oxide fuel cell system mainly includes: air heater, fuel reformer, stack and exhaust gas burner, wherein, the stack usually includes several or even more than a dozen stack units, and each stack unit needs The air and fuel required for the fuel cell reaction are provided separately. [0003] Since the solid oxide fuel cell is a medium-high temperature fuel cell, and the operating temperature of the stack is as high as 600°C-1000°C, both air and fuel need to be heated before entering the stack. Th...

AI Technical Summary

Problems solved by technology

However, the start-up time of the solid oxide fuel cell system for several hours is a key difficulty in its application and promotion, which seriously restricts the application of the solid oxide fuel cell system in the field of vehicles.

[0006] In addition, the solid oxide fuel cell system requires fuel injection, ignition and control devices, which makes the whole system more complicated. Moreover, fuel combustion will inevitably produce some harmful gas emissions, which is difficult to meet the needs of cleanliness and environmental protection

[0007] In addition, solid oxide fuel cells include multiple stack units, and each stack unit is composed of hundreds of battery cells. The overall mass of the stack is large, and the material of the stack is also a material with a large heat capacity, such as ceramics and metals. etc., resulting in a large heat capacity of the stack and a slow heating rate

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