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Method for determining parameters of solid oxide fuel cell system
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A fuel cell system, solid oxide technology, applied in fuel cells, fuel cell additives, circuits, etc., can solve problems such as high temperature and suboptimal efficiency
Active Publication Date: 2014-08-06
HUAZHONG UNIV OF SCI & TECH
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[0006] Aiming at the defect that the temperature of the existing SOFC system is too high during operation and the efficiency is not optimal, the present invention provides a method for determining the parameters of the SOFC system, which can maintain the system temperature at a safe level while maximizing the system efficiency Within the range, so as to ensure a stable and optimal working environment for the stack, improve system efficiency, and ensure the service life of the stack
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example 1
[0086] Example 1: First set four operating parameters, namely stack current I st , the bypass valve opening BP, the excess air ratio AR and the fuel utilization rate FU have a value range of I st =[10A, 80A], BP=[0.0, 0.3], AR=[6, 12], FU=[0.6, 0.9], the discrete precision is 2A, 0.05, 0.5 and 0.05 respectively, so the discrete numbers are respectively 36, 7, 13, 7. Each set of values after discretization of the four operating parameters constitutes the operating point (I st ,BP,AR,FU) for traversal collection, namely (10,0.0,6,0.6), (10,0.05,6,0.6), (10,0.05,6.5,0.6), (10,0.05,6.5,0.65 )...(80,0.3,12,0.9), so that the total number of operation points of the first operation point group is 22932.
[0087] Then set the operating parameter stack current I st , the bypass valve opening BP, the excess air ratio AR and the fuel utilization rate FU interpolation accuracy are 2A, 0.05, 0.125 and 0.00625 respectively, that is, the operation parameter stack current I st and bypas...
example 2
[0089] Example 2: First set four operating parameters, namely stack current I st , the bypass valve opening BP, the excess air ratio AR and the fuel utilization rate FU have a value range of I st =[10A, 80A], BP=[0.0, 0.3], AR=[6, 12], FU=[0.6, 0.9], the discrete precision is 5A, 0.1, 1 and 0.1 respectively, so the discrete numbers are respectively 15, 4, 7, 4. Each set of values after discretization of the four operating parameters constitutes the operating point (I st ,BP,AR,FU) for traversal collection, namely (10,0.0,6,0.6), (10,0.1,6,0.6), (10,0.1,7,0.6), (10,0.1,7,0.7 )...(80,0.3,12,0.9), so that the total number of operation points of the first operation point group is 1680.
[0090] Then set the operating parameter stack current I st , bypass valve opening BP, air excess ratio AR and fuel utilization rate FU interpolation accuracy are 5A, 0.1, 0.25 and 0.02 respectively, that is, the operation parameter stack current I st and bypass valve opening BP accuracy rem...
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Abstract
The invention discloses a method for determining parameters of a solidoxide fuel cellsystem, and belongs to the field of fuel cells. The solidoxide fuel cellsystem is analyzed in a static mode, and the tree-form classification statistical method is adopted to collect steady-state output operation points of the system in a traversal mode to form an operation point set; furthermore, the cubic convolution interpolation algorithm is used for obtaining a large number of operation point data; based on the expanded steady-state output operation point set and output feature parameters, a safety operation range meeting the system temperature restrain requirement is found out, and the optimal operation points under different power can be found out. The found system optimal operation points are the optimal parameter combination of the solidoxide fuel cell system working in a steady state and are the foundation for optimal control of the solid oxide fuel cell system, and stable and efficient operation of the system can be guaranteed.
Description
technical field [0001] The invention belongs to the field of fuel cells, and more specifically relates to a method for determining parameters of a solid oxide fuel cell system. Background technique [0002] A solid oxide fuel cell (SolidOxide Fuel Cell, hereinafter referred to as SOFC) system is a system that directly converts chemical energy into electrical energy through an electrochemical reaction. With outstanding features such as high energy conversion efficiency, zero pollution, and zero noise, it is an ideal alternative energy source, so it is considered to be one of the most promising fuel cells at present. [0003] There are many important indicators to measure the SOFC system, such as the price, power density, safety, reliability, durability, efficiency and life of the battery of the fuel cell system. In the application process of the SOFC system, first of all, under the premise of ensuring its output required power and normal and safe operation (often limited by...
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