Abstract
The utilization of blended coals has become popular in northwestern China. In this paper, investigations on coal properties and combustion characteristics of blended coals have been carried out to provide guidance for blended-coal-fired plants. Experimental results show that proximate, ultimate, and calorific value analyses of blended coals can be calculated by mass-weighted average of individual coals. However, grindability, ash composition, ash fusion temperatures, and some characteristics related to combustion performance of blended coals cannot be predicted accurately from those of individual coals and the mixture ratio. Blending a coal of high fusion temperatures with a coal of low fusion temperatures can significantly increase the ash fusion temperatures of blended coals. Thermogravimetric experimental results indicate that the intense combustion stage of blended coals is quite different from those of individual coals. Thermogravimetric curves of blended coals lie between those of individual coals b...
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