Operation performance of a pilot-scale gasification/melting process for liquid and slurry-type wastes |
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Authors: | Yongseung Yun Ji Sun Ju |
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Affiliation: | (1) Plant Engineering Center, Institute for Advanced Engineering, 633-2, Goan-ri, Baegam-myeon, 449-863 Yongin, Gyeonggi-do, Korea |
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Abstract: | A gasification/melting facility that can operate up to 10 bar and 1,550 °C with a maximum 1 ton/day capacity was developed
for liquid and slurry-type combustible wastes. The main focus of the system development was minimal use of expensive fuel
for maintaining the reaction temperature by replacing it with cheap waste oil for energy input. The carbon conversion obtained
was 97% while the cold gas efficiency reached 77.6% for the refined waste oil. When the feed was refined oil mixed with fly
ash from a municipal waste incinerator, the carbon conversion and cold gas efficiency were 93% and 71.9%, respectively, with
a slag conversion ratio of 0.93. The slag produced from fly ash exhibited environmentally acceptable heavy-metal leaching
values and thus can be applicable as road material and for other purposes. The optimal O2/feed ratio was 0.9–1.0 when only the refined waste oil was gasified, whereas the O2/feed ratio had to be higher than 1.2 when fly ash was mixed. In addition, data showed that gasifier temperature can be estimated
by on-line methane concentration measurements. |
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Keywords: | Gasification Melting Combustible Wastes Slag Fly Ash |
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