摘要
研究不同机组负荷、还原剂制备方式下超低排放燃煤机组SO_(3)和NH_(3)生成及迁移规律,结果表明:负荷的升高促进SCR(选择性催化还原)系统内SO2转化为SO_(3),也会促进氨逃逸上升;机组负荷的升高抑制SO_(3)和NH_(3)在空预器段迁移;3种还原剂制备方式的机组,SO_(3)迁移比例在空预器为1.5%~10.4%,在LLT-ESP(低低温电除尘器)为33.7%~53.9%,在FGD(脱硫塔)为17.0%~29.3%;NH_(3)在空预器和LLT-ESP的迁移比例分别为23%~50%和50%~67%,进入FGD量极少;还原剂制备方式短时对NH_(3)和SO_(3)生成及迁移影响不明显,长期运行可能造成氨逃逸上升,进而影响SO_(3)迁移。
In this paper,the formation and migration characteristics of SO_(3)and NH_(3)in ultra-low emission coal-fired units under different unit loads and reductant preparation methods are studied.The results show that load increase accelerates the conversion of SO2 to SO_(3)in a selective catalytic reduction(SCR)system,and also increases the escaped ammonia.The increase of unit load inhibits the migration of SO_(3)and NH_(3)in the air pre-heater.The migration ratios of SO_(3)in air pre-heater,LLT-ESP(low-low temperature electrostatic precipitator),and FGD(flue gas desulfurization)of different reductant preparation methods units are respectively 1.5%~10.4%,33.7%~53.9%,and 17.0%~29.3%of the total SO_(3).The migration ratios of NH_(3)in air pre-heater and LLT-ESP of different reducing agent preparation methods units are 23%~50%and 50%~67%respectively with a small amount of NH_(3)entering FGD.The preparation method of the reductant has no obvious impact on the generation and migration of NH_(3)and SO_(3)in a short time,but its long-term operation may cause ammonia escape increase,which in turn affects the SO_(3)migration.
作者
李文华
吴贤豪
陈彪
胡剑利
LI Wenhua;WU Xianhao;CHEN Biao;HU Jianli(Zhejiang Zheneng Wenzhou Power Co.,Ltd.,Wenzhou Zhejiang 325602,China;Zhejiang Energy R&D Institute,Hangzhou 311121,China;Zhejiang Provincial Key Laboratory of Energy Efficiency and Pollution Control Technology for Thermal Power Generation in Zhejiang Province,Hangzhou 311121,China)
出处
《浙江电力》
2021年第8期91-95,共5页
Zhejiang Electric Power
基金
浙江省能源集团2019年科技项目(ZNKJ-2019-032)。
