Solid oxide fuel cell pile internal temperature distribution prediction method

Abstract

The invention belongs to the fuel cell field, and discloses a solid oxide fuel cell (SOFC) pile internal temperature distribution prediction method. The solid oxide fuel cell pile internal temperature distribution prediction method comprises steps (a) a finite element dynamic model is established for the SOFO pile; (b) the linear processing of the steady state operation point of the dynamic model is carried out; (c) after rationality verification, the linearized pile model is combined with a Kalman filtering temperature observer, and the pile internal temperature distribution is predicted. The actual total current, the inlet hydrogen flow, and the inlet air flow are used as input, the prediction of the actual system pile internal temperature distribution is realized, and therefore the pile temperature is effectively analyzed and controlled, and then the safe, stable, long-service time operation of the pile is guaranteed.

Description

technical field [0001] The invention belongs to the field of fuel cells, and more particularly relates to a method for predicting the internal temperature distribution of a solid oxide fuel cell stack. Background technique [0002] Solid Oxide Fuel Cell (SOFC) power generation technology has become one of the most promising power supply technologies in the 21st century due to its advantages of high efficiency, environmental protection and quietness. Although SOFC-related technologies have developed rapidly in recent years, there are still many problems to be solved in order to realize its commercialization as soon as possible, and the monitoring of temperature and temperature gradient in SOFC stacks is one of the most prominent obstacles. [0003] During the operation of the stack, the concentration of the reactant on the gas flow will gradually become uneven with the electrochemical reaction of the anode-electrolyte-negative electrode (PEN) layer, so that the corresponding ...

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Problems solved by technology

A large spatial temperature gradient will generate a large thermal stress on the battery, and the three-layer structure of the PEN battery determines that the thermal stress it can withstand is limited. Excessive thermal stress will cause the battery sheet to deform or even rupture, thereby shortening the battery life. On the other hand, if the maximum working temperature inside the SOFC stack is too high, it will damage the durability of the material and the performance of the battery. Therefore, for the stable and long-life operation of the SOFC, the maximum temperature and the maximum temperature gradient of the stack must be controlled It is within the range that the material can withstand; however, from the perspective of physical development, too many temperature detection devices such as thermocouples cannot be installed on the cells inside the SOFC stack, otherwise the good airtightness of the stack and high power generation The performance will be seriously affected, so the temperature distribution of the stack that needs to be used in the stack temperature control system cannot be directly obtained through sensor measurement

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