Abstract
With the energy consumption increasing, the coal supply in China has been becoming tight, which has made it difficult for thermal power generation in Yunnan Province. Making full use of local inferior coal and biomass resources in Yunnan can remedy the lack of fuel in power plants. In this paper, an oxygen-rich atmosphere thermogravimetric experiment was performed for a blended sample of Xiaolongtan lignite, Yiliang tobacco rod, and Fuyuan bituminous coal. The combustion characteristics of the mixed fuel under several key operating parameters (i.e., mass ratios, oxygen concentration, and heating rates) were studied. The response surface methodology was used to determine the optimal blending ratio of the three fuels. The results show that the ignition and burnout temperature of coal decrease and the combustion time diminishes with the enrichment of oxygen. The optimal oxygen concentration in the practical application is around 30%. The activation energy and preexponential factor increase with the enlargement of oxygen concentration. Such complex evaluation and optimization approach ensure the stable operation of thermal power plant production.
Highlights
Combustion of solid fuel plays an essential role for the social development as it provides the energy needed in the practical operation [1,2,3]
Chen et al [5, 6] studied the mixed combustion characteristics of two kinds of pulverized coals with different ignition characteristics and found that the ignition characteristics of the blended coal are better than those of the single coal. e ignition temperature of blended coal tends to be higher as the proportion of pulverized coal with good ignition characteristics increases
It was found that when the low activation energy bituminous coal or lignite is mixed with the anthracite with high activation energy, the ignition characteristic of blended coal is the best
Summary
Combustion of solid fuel plays an essential role for the social development as it provides the energy needed in the practical operation [1,2,3]. Increasing the proportion of high volatile coal improves the ignition, stability, and burnout characteristics of blended coal. It was found that when the low activation energy bituminous coal or lignite is mixed with the anthracite with high activation energy, the ignition characteristic of blended coal is the best. After the biomass is mixed with coal, the blended fuels have complex combustion characteristics. Motivated by the above requirements, this article will study the optimization problem of the fuels blending via the response surface method, aiming at finding an optimal mix scheme for different fuels with the best combustion performance achieved.
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