Abstract
Boiler’s combustion efficiency directly reflects the status of its operation and affects the economical efficiency of the power plant. As we know, what mainly influences the combustion efficiency is the heat loss, and the excess air coefficient is an important factor affecting the heat loss. This paper’s objective is to explore a method for calculating the optimum excess air coefficient. Firstly, by analyzing combustion mechanism of boilers, the mechanism analysis model is employed to obtain the relationships between excess air coefficient and all the heat loss. Secondly, the unconstrained function optimization model is carried out to determine the optimum excess air coefficient, then the golden section method and the quadratic interpolation method are used to obtain the optimum excess air coefficient minimizing the sum of all the heat loss under different loads. While in order to simplify the problem, some reasonable assumptions are made. Moreover, using the data of a certain power plant, the method in this paper is verified, and the optimum excess air coefficient should be around 1.21.Thus this primary study provided some basis for the exploration about optimum operation of boilers. Keywords-optimum excess air coefficient ; heat loss; mechanism analysis; unconstrained function optimization; golden section
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