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Incinerator Slag Formation and Control of Excursion Temperatures

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An evaluation of slag formation was initiated to reduce incinerator slag. A factorial test was used to determine the effect of polymers, primary/secondary sludge ratio, and dewatering equipment on ash fusion temperatures (ASTM D-1857). None of the parameters affected the initial deformation or softening temperatures, 1141 and 1181 °C, respectively. Incinerators experience slag formation several hundred degrees lower than the measured ash fusion temperature test results.

A new test was developed to determine ash fusion temperature. More than seventy 5-cm ash cubes were formed and heated in sets to temperatures of 816, 871, 899, 927, 954, 982, 1038, and 1093 °C. The compressive strength of each cube was measured to determine at what temperature fusion begins. A water spray system was built to control excursion temperatures and slag formation. Supplemental water for cooling excursion temperatures requires approximately 4 times less mass than air. Water injected to the incinerator condenses in the wet scrubber; therefore, there is no additional mass load to the incinerator fan. This process study defined the effect of temperature on slag formation.


Document Type: Research Article


Publication date: 2003-07-01

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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