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随着高效率采煤机和自移支架的广泛应用,日产千吨煤的工作面的大量增加和工作面推进速度的加快,造成了综采工作面含尘量的急剧增加。在现代化机械破碎的条件下矿,煤和岩石受截齿强力磨碎,致使井下空气尘含尘量达到3—5千毫克/米~3以上。美国矿山监查局不久前对美国一些矿井的空气含量矿进行过调查。在所调查的50个工作面中,只有23个工作面合乎含尘量标准。美国匹茨堡罗契斯切尔恩德公司所属的三个矿井达到了标准(10毫克/米~3)。这三个矿井采取了综合
With the wide application of high-efficiency shearer and self-moving stent, the increase of working face of Nissan kiloton coal and the acceleration of work face speeding up resulted in a drastic increase of dust content in fully mechanized mining face. Under the conditions of the modern mechanical crushing, the mines, coal and rock are strongly ground by the picks, resulting in a dust volume of 3-5 thousand milligrams / m ~ 3 in the downhole air. The U.S. Mine Inspectorate recently conducted an investigation into the air content of some mines in the United States. Of the 50 facets surveyed, only 23 faces meet the dust content standards. The three mines owned by Rocchelschelde, Pittsburgh, USA, met the standards (10 mg / m 3). The three mines have been integrated