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.

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这一方土地与纯黑色的煤有关。

Side of the land and the pure black coal.

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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.

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