超低排放燃煤电厂颗粒物脱除特性  

Particle Removal Characteristics of an Ultra-low Emission Coal-fired Power Plant

作　　者：阮仁晖 谭厚章 段钰锋 杜勇乐 刘鹤欣 萧嘉繁 杨富鑫 张朋 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 Engindering,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)

机构地区：[1]西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室,西安710049 [2]东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《环境科学》2019年第1期126-134,共9页Environmental Science

基　　金：国家自然科学基金项目(91544108);国家重点研发计划项目(2016YFB0601504);浙江省重点研发计划项目(2018C03036)

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 PM2.5-10 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 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 SO2 and particulates, but it increases PM1. The mass concentration of PM1 increases by 59.41% and the water-soluble Mg^2+, Cl^-, and SO4^2- in PM10 increases. The WESP has a high removal efficiency with respect to PM1, PM1-2.5, and PM2.5-10 and can further reduce the dust concentration. Based on an ultra-low emission reform, the final PM10 emission of this 660 MW unit is 2.04 mg·m-3.

关 键 词：超低排放 煤燃烧 烟气处理设备 颗粒物 水溶性离子 

分 类 号：X513[环境科学与工程—环境工程]