Ruan Ren-Hui, Tan Hou-Zhang, Duan Yu-Feng, Du Yong-le, Liu He-Xin, Xiao Jia-Fan, Yang Fu-Xin, Zhang Peng
Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China.
Huan Jing Ke Xue. 2019 Jan 8;40(1):126-134. doi: 10.13227/j.hjkx.201805184.
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 PM, PM, and PM 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 PM by 52.11%. 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 SO and particulates, but it increases PM. The mass concentration of PM increases by 59.41% and the water-soluble Mg, Cl, and SO in PM increases. The WESP has a high removal efficiency with respect to PM, PM, and PM and can further reduce the dust concentration. Based on an ultra-low emission reform, the final PM emission of this 660 MW unit is 2.04 mg·m.
本研究选取了京津冀地区一座超低排放燃煤电厂的一台660兆瓦机组。采用德卡蒂低压冲击器（DPLI）在包括选择性催化还原（SCR）、低低温省煤器（LLTe）、静电除尘器（ESP）、湿法烟气脱硫（WFGD）和湿式静电除尘器（WESP）在内的烟气净化装置的进出口对颗粒物进行采样。在WFGD和WESP的进出口还使用了过滤采样系统。在进行超低排放改造后，获得了不同烟气净化装置对PM、PM和PM的去除效率。结果表明，SCR使细颗粒物和PM的质量浓度增加了52.11%。LLTe提高了ESP的去除效率，尤其是对粒径范围为0.1 - 1μm的颗粒。高效WFGD既能去除SO又能去除颗粒物，但它增加了PM。PM的质量浓度增加了59.41%，且PM中水溶性Mg、Cl和SO增加。WESP对PM、PM和PM具有较高的去除效率，能够进一步降低粉尘浓度。基于超低排放改造，该660兆瓦机组最终的PM排放量为2.04毫克·立方米。
