粒径和入炉煤水分对白音华褐煤热解特性的影响

摘要

为获得粉状褐煤蓄热式下行床快速热解适宜工艺参数,通过蓄热式下行床快速热解试验装置,在900℃高温热解试验条件下,研究了白音华褐煤煤粉粒度分布和入炉煤水分对热解产物产率和热解气体组成的影响.结果表明:粒径＜6 mm时,随煤粉粒径增大,热解半焦产率增加,热解焦油产率均低于3％,热解气产率逐渐降低,该粒径范围内的热解气产率较高(＞35％).因此,＜6 mm煤粉均适用于蓄热式下行床热解工艺,工业生产过程中可依据下游除尘要求,在＜6 mm内筛选煤粉粒径.煤粉粒径＜3 mm、入炉煤水分在15.10％～25.03％时,随入炉煤水分的增加,热解水、热解气产率增加,半焦产率降低,因此,高入炉煤水分有利于粉状褐煤热解,提高褐煤煤粉干燥效率,降低烟尘和小颗粒煤粉的排放量.%In order to obtain the optimal process parameters,the Baiyinhua lignite was pyrolyzed at 900 ℃ in a regenerative downer reactor.The influence of lignite particle size and moisture content in lignite on the yield of pyrolysis product and characteristics of gas was analyzed.Results indicate that with the lignite particle size increasing from 0 to 6 mm,yield of pyrolysis gas decreases.The lignite with particle size of 0-6 mm is suitable for pyrolysis,because the yields of pyrolysis gas are greater than 35％.For the lignite particle size ＜3 mm,the yield of pyrolysis water and pyrolysis gas increase,and the yield of char decreases with the rise of moisture content from 15.10％ to 25.03％.Thus,the lignite with higher moisture content in the range of 15.10％ to 25.03％ is suitable for pyrolysis.With the raising of moisture content,the drying efficiency could be remarkably enhanced,and the soot amount could be reduced.