目前市场供给小型工业锅炉(特别是生活采暖锅炉)的煤与原设计煤种不同,多系含灰量大、发热量低的Ⅱ类以下的烟煤,煤种也经常变更.各单位在使用过程中虽然都采取了一些措施:如在炉膛增设卫燃带和炉拱,改变配风方式等,合理组织燃烧,使煤尽量在炉膛内充分燃烧,以消除炭黑,减少烟囱冒黑烟机会,减轻对大气的污染。然而由于供应的煤含灰量大,烟气中飞灰多,再 At present, the coal supplied to the small industrial boilers (especially the domestic heating boilers) is different from the originally designed coal types, and the coal types below Grade II with large ash content and low calorific value are also frequently changed. Although some measures have been taken, such as adding deflagration flaps and furnace archs in the hearth, changing the method of distributing air, etc., organizing the combustion reasonably to make the coal fully burn in the furnace as much as possible so as to eliminate the carbon black and reduce the chance of black smoke in the chimney, Reduce the pollution of the atmosphere. However, due to the large supply of coal ash, flue gas in the fly ash and more