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OALib Journal期刊
ISSN: 2333-9721
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水对氧煤燃烧方式下煤粉热解及燃烧过程的影响
, PP. 62-67
Keywords: 氧煤燃烧,水,热解,脱挥发分,燃尽率,co,停留时间,沉降炉
Abstract:
为了探究湿式氧煤燃烧过程产生的高体积分数水对煤粉脱挥发分、煤焦气化、颗粒燃尽及co生成特性的影响,利用自行搭建的沉降炉系统,在0.2s,0.3s和0.5s停留时间条件下分别进行了模拟烟气气氛下的煤粉热解和燃烧实验。其中,热解实验采用纯n2气氛、纯co2气氛和co2+水(不同体积分数比)气氛,燃烧实验则在此基础上分别加入了体积分数为5%,10%,21%和30%的o2来替换气氛中的n2或co2。结果表明:相较于空气燃烧,氧煤燃烧中的高体积分数co2会抑制煤粉挥发分的析出,而高体积分数水的加入则会提高氧煤燃烧初期煤粉脱挥发分的速率,且在煤粉热解阶段,水和co2不会与煤焦发生气化反应;水在高氧体积分数、足够的停留时间条件下对煤粉燃尽率基本无影响,但会降低低氧体积分数条件下的煤粉燃尽率;水能够促进co的氧化,从而降低炉内的co体积分数。
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