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Distribution and emission characteristics of filterable and condensable particulate matter before and after a low-low temperature electrostatic precipitator

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Abstract

The low-low temperature electrostatic precipitator (LLT-ESP), a combination of a traditional temperature electrostatic precipitator (ESP) and a non-leakage media gas-gas exchange (MGGH), could reduce the inlet flue gas temperature below the dew point and improved the performance of the ESP. Particulate matter (PM) from the stationary sources contains filterable particulate matter (FPM) and condensable particulate matter (CPM). In this study, coal with a high ash content (coal-HA) was burned, and the emission characteristics and removal efficiencies of the particulate matter in an LLT-ESP were investigated. The standards used to test filterable and condensable PM were ISO standard 23210-2009 and U.S. EPA Method 202, respectively. The LLT-ESP was efficient in removing filterable PM, with a total filterable PM removal efficiency as high as 99.6%. The removal efficiency of filterable PM increased with increasing particulate size and decreasing imported flue gas temperature. The LLT-ESP also provided excellent removal of condensable PM with a condensable PM removal efficiency exceeding 77%. Upstream of the LLT-ESP, the concentrations of filterable PM were much higher than those of condensable PM. Downstream of the LLT-ESP, the relationship between the quantities of condensable and filterable PM reversed. To reduce the emissions of PM from coal-fired power plants, more attention should be paid to controlling condensable PM. The temperature of the flue gas upstream of the LLT-ESP played an important role in eliminating condensable PM. At lower imported flue gas temperature operation conditions, the removal efficiency of the LLT-ESP for the condensable PM and the escaping mass concentration of condensable PM increased. Among the organic fraction of the condensable PM, hydrocarbons and esters were dominant. Meanwhile, SO42− was the primary component, followed by Cl− in anions. Na+, Ca2+, and Fe3+ were the main components in metal ions. Particles with diameters ≥ 10 μm, which contained most of the Si and Al, were dominant in the fly ash collected from sections 1 and 2 of the LLT-ESP. The main particles in sections 3 and 4 were PM10, which contained the highest concentrations of Ca and Fe.

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Authors and Affiliations

  1. State key laboratory of Clean Energy Utilizition, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, China

    Xiaodong Li, Chenyang Zhou, Jingwei Li, Shengyong Lu & Jianhua Yan

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  1. Xiaodong Li
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  2. Chenyang Zhou
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  3. Jingwei Li
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  4. Shengyong Lu
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  5. Jianhua Yan
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Correspondence to Xiaodong Li.

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Responsible editor: Bingcai Pan

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Li, X., Zhou, C., Li, J. et al. Distribution and emission characteristics of filterable and condensable particulate matter before and after a low-low temperature electrostatic precipitator. Environ Sci Pollut Res 26, 12798–12806 (2019). https://doi.org/10.1007/s11356-019-04570-y

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