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.

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。

youdao

One article is added as article 24: "the State promotes the dressing of coal by washing to reduce the sulfur and ash in coal, and restricts the mining of high-sulfur or high-ash coal."

增加一条，作为第二十四条：“国家推行煤炭洗选加工，降低煤的硫份和灰份，限制高硫份、高灰份煤炭的开采。”

youdao

Then the data that are produced can be put into models to determine how far, how high and how wide the ash will spread that will be based more on fact than on guesswork.

最后，我们测得的数据可以构建一个模型，用来确定火山灰可以扩散多远、多高还有多广。 这些预测基于事实，而不是臆断。

youdao

Usually, the prevailing south-westerly wind would take the ash cloud away from Europe and over the polar region, but a high-pressure area is bringing it over Europe, where it is sitting and barely moving as the ash spreads.

BBC: Volcano cloud threatens Formula 1 preparations

Both BA and KLM, after all, had direct experience of what flying through volcanic ash can do to a high-bypass turbofan jet engine.

ECONOMIST: The effect on business and leisure

Ryanair said the "red zone" over Scottish airspace where ash has been classified "high-density" was invented by the Met Office and the Civil Aviation Authority (CAA).

BBC: NI flights cancelled as ash cloud approaches