Abstract
Abstract Modern central-station power plants generating steam in slag-tap pulverized-coal-fired furnaces often report difficulties in operation as the result of excessive accumulations of slag on the heat-absorbing surfaces of the furnace. Such deposits of slag interfere with the expected transfer of heat from the furnace to the tube metal, and not only may cause trouble in maintaining superheat temperatures at proper levels, but also may be responsible for troubles experienced with circulation. Few means have been available in the past to evaluate the tendency of slags to form objectionable deposits. This paper describes methods of predicting the relative thickness of slag deposits on heat-absorbing surfaces and is based upon the application of data obtained in the laboratory on the flow properties of coal-ash slags at high temperatures. Although based on idealized furnace conditions, it should serve as a guide in comparing the behavior of different coal ashes in the same furnace under similar operating conditions, or in predicting the effect of change in these conditions on the action of a given coal ash. Also, it should serve as a guide for field tests of the effect of slag on furnace performance.
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