Introduce the development of lignite drying and quality-improving technology at home and abroad. To solve the problems of high energy consumption, high investment and low safety existed in traditional thermal drying process in lignite power plants, conducted the experiments of superheated steam drying mechanism and pilot test. The results show that the effect of superheated steam drying is better than conventional hot air drying;and the pilot system can stably and continuously work, the dried products meet the requirements of brown coal drying practicalapplications. At last,proposed a kind of clean coal technology--SCU, which pre-drys and improvs low-quality coalby superheated steam. Analyze advantages of this technology from the aspects of energy saving and safety,etc.. The results show that the technology has the advantages of low consumption, high safety and energy-saving. Developing sets of superheated steam drying can promote the development of energy and power industry, and has broad application prospects.%论述了国内外褐煤干燥提质技术的发展现状.针对传统热力干燥在褐煤电厂应用中存在的高能耗、高投资和低安全性等问题,开展了褐煤过热蒸汽干燥机理的试验研究和中试试验.结果表明:过热蒸汽的干燥效果优于常规热空气；中试试验系统能稳定、连续地对褐煤进行干燥,且干燥产品符合褐煤干燥实际工业应用的要求.最后提出了过热蒸汽预干燥低质煤提质洁净煤技术(SCU技术),对其在节能、安全等方面的技术先进性作了具体的对比分析,结果表明:SCU技术节能节水、安全性高,符合中国可持续发展战略和节能减排的要求.
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