超低排放燃煤电厂颗粒物脱除特性
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摘要
在京津冀某660 MW超低排放发电机组,通过低压撞击器(DLPI)颗粒物取样系统对选择性催化还原装置(SCR)、低低温省煤器(LLTe)、静电除尘器(ESP)、高效湿法脱硫塔(WFGD)、湿式静电除尘器(WESP)进出口烟气中的颗粒物取样,通过滤膜取样系统对WFGD、WESP进出口颗粒物进行同步取样.获得了超低排放改造后,不同烟气处理设备对PM1、PM1~2.5、PM_(2.5~10)的脱除效率.结果表明,SCR能够明显增加PM1的质量浓度,PM1增加了52.11%;LLTe能够显著提高ESP的脱除效率,尤其是0.1~1μm范围内的颗粒物;WFGD能够协同脱除SO_2和颗粒物,但会增加PM1的排放,PM1质量浓度增加了59.41%,PM10中水溶性Mg2+、Cl-、SO2-4组分增加;WESP对PM1、PM1~2.5、PM_(2.5~10)均有较高的脱除效率,能够进一步降低颗粒物质量浓度.超低排放技术路线下,该燃煤电厂最终排放的PM10质量浓度为2.04 mg·m~(-3).
A 660 MW unit of an ultra-low emission coal-fired power plant in the Beijing-Tianjin-Hebei area was chosen for this study.The particulate matter was sampled with a Dekati low-pressure impactor(DPLI) at the inlet and outlet of flue gas cleaning devices including selective catalytic reduction(SCR),low-low temperature economizer(LLTe),electrostatic precipitator(ESP),wet flue gas desulfurization(WFGD),and wet electrostatic precipitator(WESP).A filter sampling system was also used at the inlet and outlet of the WFGD and WESP.The removal efficiencies of PM1,PM1-2.5,and PM_(2.5)-10 from different flue gas cleaning devices were obtained after ultra-low emission modification.The results show that SCR increases the mass concentration of fine particulates and PM1 by52.11%.The LLTe improves the removal efficiency of the ESP,especially for particles with a range of 0.1-1 μm.The high-efficiency WFGD removes both SO2 and particulates,but it increases PM1.The mass concentration of PM1 increases by 59.41% and the watersoluble Mg2+,Cl-,and SO2-4 in PM10 increases.The WESP has a high removal efficiency with respect to PM1,PM1-2.5,and PM_(2.5)-10 and can further reduce the dust concentration.Based on an ultra-low emission reform,the final PM10 emission of this 660 MW unit is2.04 mg·m~(-3).
A 660 MW unit of an ultra-low emission coal-fired power plant in the Beijing-Tianjin-Hebei area was chosen for this study.The particulate matter was sampled with a Dekati low-pressure impactor(DPLI) at the inlet and outlet of flue gas cleaning devices including selective catalytic reduction(SCR),low-low temperature economizer(LLTe),electrostatic precipitator(ESP),wet flue gas desulfurization(WFGD),and wet electrostatic precipitator(WESP).A filter sampling system was also used at the inlet and outlet of the WFGD and WESP.The removal efficiencies of PM1,PM1-2.5,and PM_(2.5)-10 from different flue gas cleaning devices were obtained after ultra-low emission modification.The results show that SCR increases the mass concentration of fine particulates and PM1 by52.11%.The LLTe improves the removal efficiency of the ESP,especially for particles with a range of 0.1-1 μm.The high-efficiency WFGD removes both SO2 and particulates,but it increases PM1.The mass concentration of PM1 increases by 59.41% and the watersoluble Mg2+,Cl-,and SO2-4 in PM10 increases.The WESP has a high removal efficiency with respect to PM1,PM1-2.5,and PM_(2.5)-10 and can further reduce the dust concentration.Based on an ultra-low emission reform,the final PM10 emission of this 660 MW unit is2.04 mg·m~(-3).
引文
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[22]Xu Y S,Liu X W,Zhang Y,et al.Field measurements on the emission and removal of PM2.5from coal-fired power stations:3.Direct comparison on the PM removal efficiency of electrostatic precipitators and fabric filters[J].Energy&Fuels,2016,30(7):5930-5936.
[23]束航,张玉华,杨林军,等.SCR烟气脱硝对PM2.5排放特性的影响机制研究[J].燃料化学学报,2015,43(12):1510-1515.Shu H,Zhang Y H,Yang L J,et al.Effects of SCR-DeNOx system on emission characteristics of fine particles[J].Journal of Fuel Chemistry and Technology,2015,43(12):1510-1515.
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