Abstract:
Cement industry yields a large air pollution emission including particulate matters. As the particulate concentration limits in the industrial emission standard has been very strict, it leaves smaller and smaller space to further reduce the pollutant emission by setting stricter standard limits. Therefore, the emission reduction by standard has been difficult to make cement industry to achieve a higher reduction target. There are several processes in cement production that emit waste gases. Under the same emission standard limits, the total emissions of various pollutants will be determined by the total waste gas volumes of various kinds. Through case studies, it was shown that the kiln end afterwinds could be recycled to reduce the primary air ratio in kiln end coal feeding and the coal-feeding fan air volume in calcining combustors, so as to realize reduction of high-temperature waste gas volume. The cement kiln end low-temperature waste heat could be used to dry materials and thus realize reduction of waste gas volume in low-temperature drying. The room-temperature exhaust gas could be used as pulverized coal combustion air in cement kiln ends and calcining combustors and thus realize reduction of the room-temperature waste gas volume. The reduction amount of pollutants including particulates through waste gas volume reduction was further analyzed. This research could provide a new way of thinking for cement industry to carry out advanced pollutant emission reduction