水泥窑低氮分级燃烧下脱硝工程技术的研究综述

Summary of Research on Denitrification Engineering Technology under Low Nitrogen Staged Combustion in Cement Kilns

水泥窑低氮分级燃烧一直是人们关注的重点,氮氧化物排放污染占据我国污染源的60%,本文通过对烟气中氮氧化物控制的技术特点、烟气脱硝现状、烟气脱硝种类和低氮分级燃烧技术进行细致的分析,在目前水泥窑低氮分级燃烧技术的基础上,充分利用分解炉内的烟气工况条件,并且对选择性非催化还原(SNCR)的活性氨基组分进行了改进,避免使用氨水量过高对设备的高腐蚀性,与同时匹配条件下室温智能干粉脱硝技术,使得氮氧化物在分解炉的还原区得到源头治理,以减少脱硝工程的不必要建设,在节能减排方面具有重要的意义。

Low-nitrogen staged combustion in cement kilns has always been the focus of people’s attention. Nitrogen oxide emissions account for 60% of China’s pollution sources. The nitrogen-staged combustion technology carries out detailed analysis. Based on the current low-nitrogen staged combustion technology of cement kilns, the flue gas working conditions in the decomposition furnace are fully utilized, and the active amino components of selective non-catalytic reduction (SNCR) are carried out. Improvements have been made to avoid the high corrosiveness of the equipment due to the excessive use of ammonia, and the room temperature intelligent dry powder denitrification technology under matching conditions at the same time enables nitrogen oxides to be sourced in the reduction zone of the decomposition furnace to reduce unnecessary construction of denitrification projects. It is of great significance in terms of energy saving and emission reduction.