结果表明，HF酸对高硅低钙含量的煤和石墨有显著的脱灰效果；
The results showed that HF acid has remarkable deashing capacity for coal and graphite with high Si and low Ca content.
一般说来，电站煤质的品位低、灰含量高(低的固定碳含量)，直接气化效果很差。
Generally speaking, the coal of power plant is low-grade, high-ash (the low content of fixed carbon) and the effect of direct gasification is bad.
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