由于采煤工艺的变化和老矿井储量减少,顿(?)茨无烟煤急剧变差:灰分和水分增加,发热量减少。表中列出了燃用顿(?)茨无烟煤的七个电站20年来煤质分析资料。根据预测,在1995～2000年间顿(?)茨无烟煤还要变差,其平均特性将是:Qn(?)t·(?)·ar=17200kJ/kg,Aa=40％,Mt.ar=10％～11％。煤质变差,给锅炉运行带来很多麻烦。前先,由于水分的增加,在制粉系统中需要蒸发 Due to changes in the coal mining process and the reduction in reserves of old mines, Daytonite anthracite drastically deteriorates: ash and moisture increase, and heat generation decreases. The table lists coal quality analysis data for seven years at seven power plants burning Dayton? S anthracite. It is predicted that the anthracite coal will have worsened between 1995 and 2000. The average characteristics of the anthracite coal will be: Qn (?) T · (·) · ar = 17200kJ / kg, Aa = 40%, Mt.ar = 10% ~ 11%. Poor quality of coal, boiler operation to bring a lot of trouble. Before the first, due to the increase of moisture, it needs to be evaporated in the milling system