【摘要】 面向煤炭清洁高效利用的需求,基于"SCR+ESP+FGD+WESP"超低排放技术路线,通过对某660MW燃煤机组污染物控制单元性能试验分析,全流程考察了各污染物控制单元超低排放性能状态。试验结果显示:烟尘、SO₂和NO_x排放浓度分别为2.7、6.2、17.6mg/m³,分别为超低排放限值的27.0%、17.7%、35.2%。污染物控制单元之间对SO₃和烟尘具有协同控制效应:SO₃综合脱除效率为91.5%,烟尘综合脱除效率为99.98%。湿式电除尘器有利于协同控制烟气中细颗粒物(PM_2.5)、SO₃和液滴排放。结果表明:湿式电除尘器对PM_2.5的脱除效率分别为82.9%和81.8%,平均值82.5%;对SO₃协同脱除效率分别为58.8%和52.9%,平均值为52.9%;对液滴协同脱除效率分别为76.9%和72.3%,平均值为74.6%。以100%负荷的B工况为例,WESP出口烟气量为2235693m³/h,根据中国电力企业联合会2020年度中国电力行业发展报告中火电发电设备利用小时数4307h计算,现行排放浓度与超低排放限值相比,烟尘、SO₂和NO_x分别减排了约70.3、277.3、312.0t,环境效益显著。所述路线、结果可为提升燃煤机组污染物控制能力提供技术参考。更多还原

【Abstract】 Facing the major strategic demand for clean and efficient use of coal, performance test analysis of a 660MW coal-fired unit pollutant control unit was studied based on the SCR+ESP+FGD+WESP ultra-low emission technology route. The ultra-low emission performance of each pollutant control unit was investigated in the whole process. It is showed that emission concentrations of dust, SO₂ and NO_x are 2.7, 6.2 and 17.6 mg/m³, respectively, which are 27.0%, 17.7% and 35.2% of the ultra-low emission limits. Pollutant control units have a synergistic control effect on SO₃ and dus. Comprehensive removal efficiency of SO₃ is 91.5%. The comprehensive removal efficiency of dust is 99.98%. Wet electrostatic precipitator is beneficial to co-control the emission of fine particulate matter(PM_2.5), SO₃ and liquid droplets in flue gas. The results show that the removal efficiency of PM_2.5 by wet electrostatic precipitator is 82.9% and 81.8%, respectively, with an average number of 82.5%. The synergistic removal efficiency of SO₃ is 58.8% and 52.9%,with an average of 52.9%. The synergistic removal efficiency of droplet is 76.9% and 72.3%, respectively, with an average of 74.6%. Taking condition B with 100% load working condition as an example, the export flue gas volume of WESP is 2235693 m³/h, which is calculated according to 4307 h utilization hours of thermal power generation equipment in the 2020 China Electric Power Industry Development Report of China Electricity Council. Compared with the ultra-low emission limit, emission reduction of dust, SO₂ and NO_x is about 70.3 t, 277.3 t and 312.0 t, respectively. Environmental benefits are very significant. The ultra-ultra-low emission technology route provides a technical reference for further improving pollutant control ability of coal-fired units.更多还原