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一、概况我厂两台液态出渣煤粉炉,配有四台287/470型钢球磨煤机。设计要求煤种为磨半烟煤,其出力在20吨/时左右。1966年前经过设备改进、煤粉细度放粗等措施,磨煤机出力曾达到23吨/时,磨煤机单耗最低达到28度/吨煤左右。1978年两台液态炉恢复烧煤后,由于来煤复杂、煤质多变,经常出现二高一低(灰份、水份高,挥发份低)现象;同时,由于钢球直径大小不一,制粉出力最高仅22吨/时,制粉单耗经常维持在30～31度/吨煤水平。为了提高磨煤机出力,降低制粉单耗,赶超历史先进水平,我们采用了优选法。对制粉系统甲组进行试验,通过优选试验使13号炉甲组制粉单耗达到27度/吨煤,比调试前下降3度/吨煤左右。
I. Overview I plant two liquid slag pulverizer, equipped with four 287/470 ball mill. Design requirements for coal grinding half bituminous coal, its output at 20 tons / hour or so. Before 1966 through equipment improvements, coal fineness and other measures, mill output has reached 23 tons / hour, coal mill unit consumption as low as 28 degrees / ton of coal or so. In 1978 two liquid furnace resumed coal, due to complex coal, coal quality changeable, often appear two high and one low (ash, high moisture, low volatile) phenomenon; the same time, the ball diameter of different sizes , The highest milling output of only 22 tons / hour, milling unit consumption is often maintained at 30 ~ 31 degrees / ton coal level. In order to improve the coal mill output, reduce the consumption of milling, catch up with the advanced level in history, we have adopted the preferred method. The pulverizing system Group A was tested. Through the optimized test, the pulverized coal consumption of No.13 furnace group A reached 27 degrees per ton of coal, about 3 degrees per ton of coal before debugging.