Increased reaction time, smaller coal particle size and increased reburn fuel fraction lead to higher NO reduction rate.

所以,在使煤粉成为超细粉的基础上,利用低挥发分烟煤作为再燃燃料是具有可行性的。

The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.

短壁刀柱采煤法即条带开采,目前在陕西省小煤矿开采中较广泛应用。