过去,上海电缆厂生产某些需对外护层浸涂液态沥青的电缆,采用明火敞开式加热沥青,产生大量沥青烟气,严重污染作业环境。据测定,工人作业带空气中含沥青烟气量达135.7毫克/米~3。工厂为改善工人的劳动条件,自1983年以来,投资66万元,成功地建成了封闭式熔化沥青装置,还安装了烟气 In the past, some of the cables in Shanghai Cable Factory that needed to be dip-coated with liquid asphalt on outer sheaths were heated open-pitched with open flame to produce a large amount of bitumen smoke, which seriously polluted the working environment. According to the determination, the workers in the air with asphalt flue gas volume of 135.7 mg / m ~ 3. In order to improve the working conditions of workers, the factory invested 660,000 yuan since 1983 and successfully built an enclosed melted asphalt plant and installed flue gas