“干燥无挥基”指标的确立及其在褐煤制半焦中的应用

Establishment of dry volatile-free basis and its application in semi-coke preparation from lignite

在阐述煤的工业分析指标及煤质分析基准的基础上,提出了一个新的基准状态——"干燥无挥基",并分析了不同基准之间的换算关系。利用干燥无灰基的组分之和对应收到基褐煤的产率将褐煤分为3个级别,即产率=50%为三级、产率=55%为二级、产率=60%为一级,其对应的产品分别称为三级半焦、二级半焦和一级半焦。最后对各级别褐煤及半焦指标进行了分析,结果表明:干燥无灰基(挥发分+固定碳)=50%时,应将制焦煤质的上限定为收到基(水分+灰分)不大于50%,且单一指标收到基水分上限不大于40%,收到基灰分上限不大于20%;当干燥无灰基(挥发分+固定碳)=55%时,半焦产品的产率为40%～45%;当干燥无灰基(挥发分+固定碳)=60%时,半焦产品的产率为41%～43%。

Based on proximate analysis and coal quality analysis, provide a new reference index, dry volatile-free basis. The lignite for semi-coke preparation is divided into three grades according to the yield of dt7 ash-free basis. The lignite is eonsidered as：the third grade when yield is 50 percent, the second grade when yield is 55 percent and the first grade when yield is 60 percent. According to these grades, semi-coke products are third grade, second grade and first grade separately. The results of analysis on different grades lignite and semi-coke analytical items demonstrate that when the dry ash free item （volatile ＋ fixed carbon） is 50 percent, the lignite upper limit of moisture and ash should not exceed 50 percent,the sole item of moisture is no more than 40 pereent and the ash is no more than 20 percent. When the dry ash-flee basis （ volatile ＋ fixed carbon） is 55 percent, the yield of semi-coke preparation from lignite is between 40 pereent and 45 percent. When the dry ash free item （ volatile ＋ fixed carbon） is 60 percent,the yield is between 41 percent and 43 percent.