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Analytical Tool for Analysing Slagging Characteristic of High Ash Coals in Utility Boilers

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Document pages: 12 pages

Abstract: In today’s competitive market, the performance of electric utility industry is a serious concern to the nation. Majority of power plants are Coal-Fired Power plants in India. Due to the wide variation in the quality of coal being fired, it affects the performance of the power plant like furnace wall slagging, convective pass slagging (both Low and High Temperature), soot blower effectiveness, erosion and grindability. At this juncture, a reliable prediction is needed to assess the slagging problem which in turn affects the performance parameters of power plant like heat transfer rate, exit gas temperature, surface corrosion and frequency of soot blowing. Though conventional indices and ash fusion temperature measurement techniques do not aid in predicting slagging condition with field performance hence, it is reported to be highly subjective in nature and poor accuracy.In this work an alternative approach is made based on shrinkage measurement up to 1400 °C of coal ash prepared at 800 °C. Sensitive shrinkage measurements indicate temperatures of rapid change which correspond to the formation of liquid phases. A preliminary evaluation of shrinkage data for coal ash collected at different power stations firing wide variety of coal indicates that, the shrinkage profiles of the ashes are differing widely and rate of shrinkage measurement can provide an alternative approach to characterize assess the slagging potential. Shrinkage measurement of coal ash has been carried out for the coal ashes collected at different power stations using different quality of coal.

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