燃煤烟气污染物脱除技术研究进展

Research Progress on Removal of Pollutants from Coal-fired Flue Gas

烟气除尘技术由静电除尘、袋式除尘,发展到电袋复合除尘。烟气脱硫有干法、半干法、湿法等多种技术,但目前应用最广的仍是石灰石-石膏湿法。电厂烟气脱硝主要采用选择性催化还原技术,其关键在于低负荷、全负荷烟气脱硝催化剂的开发以及催化剂的再生。活性炭喷射是烟气脱汞较为成熟的技术,但其成本高昂,并影响飞灰的综合利用,近年来,催化烟气脱汞技术得到了发展,并取得了一系列成果。多种污染物联合脱除技术可减少单种污染物各自脱除的运行成本,已成为发展趋势。

In the flue gas pollutants emission reduction technology, the flue gas dust removal technology is developed from electrostatic precipitation and bag dust collection, to the electrostatics fabric filter,wet dust removal, low-low temperature electrostatic precipitator and agglomeration technology. Flue gas desulfurization methods include dry, semi-dry,wet and other technologies,but the most widely used is still limestone-gypsum wet method. Flue gas denitrification technology mainly includes selective non-catalytic reduction（ SNCR） and selective catalytic reduction（ SCR）,etc. SCR flue gas denitrification technologies more widely used in the power plant, the key technologies lie in the developing low load,full load denitration catalyst and catalyst regeneration.Activated carbon injection is a more technology mature of flue gas mercury removal,but its cost is high,and it also affects the comprehensive utilization of fly ash. In recent years,catalysis and other flue gas mercury removal technology has been developed,with a series of results obtained.The combined removal of multiple pollutants can reduce the operating cost of single pollutant removal and it becomes a trend of development.