用二级脱氟处理方法可使高纯煤中氟含量达到实际应用所允许的要求，接近原煤中的氟含量。
The fluorine content in cleaned coal will be nearly same as its original matrix by two grade defluorination treatment.
这一方土地与纯黑色的煤有关。
大纯时延、煤种多变和蒸汽负荷频繁变化是链条炉难以进行良好燃烧控制的原因。
It is difficult to have good performance for chain boiler combustion control system due to large delay time, varying coal's quality and steam load.
实验证明，根据这一原则设计的开缝纯体燃烧器对低挥发分煤粉的着火与火焰稳定具有较好的适应性。
Experiments show that a new-type pulverized coal burner with a slit bluff-body designed on the said principle is suitable for the ignition and flame stability of low volatile pulverized coal.
用煅烧石油焦和煤沥青为基本原料，采用热压和石墨化工艺制备了几种纯石墨材料。
Bulk graphite was prepared from calcined coke and coal tar pitch precursors by hot pressing and graphitization.
用煅烧石油焦和煤沥青为基本原料，采用热压和石墨化工艺制备了几种纯石墨材料。
Bulk graphite was prepared from calcined coke and coal tar pitch precursors by hot pressing and graphitization.
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