| 超低排放改造后燃煤电厂细颗粒物排放特征 |
| 摘要点击 2432 全文点击 784 投稿时间：2019-04-17 修订日期：2019-08-15 |
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| 中文关键词 燃煤电厂 超低排放 湿式电除尘 细颗粒物 水溶性离子 微形貌分析 |
| 英文关键词 coal-fired power plant ultra-low emissions wet electrostatic precipitators fine particulate matter water-soluble ions micromorphology analysis |
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| 中文摘要 |
| 超低排放改造后，燃煤电厂细颗粒物排放特征发生了变化，为定量评估颗粒物中各组分的排放特征及环保设备对细颗粒物的影响，选取了3台超低排放机组为研究对象，利用DGI分级撞击采样器对湿法烟气脱硫装置（WFGD）、湿式静电除尘器（WESP）进、出口颗粒物取样并用多种指标分析研究.结果表明，3台机组出口处排放的PM1、PM2.5和PM10质量浓度范围分别为0.25~0.38、0.31~0.42和0.42~0.57 mg·m-3，两种改造工艺下排放的PM10质量浓度相当，但是颗粒物粒径分布和成分组成存在差异，相比FP1和FP2机组，FP3机组PM2.5/PM10比值最高，可能原因是FP3机组安装了WESP，对粒径2.5 μm以上的颗粒有更好地脱除效果.FP2和FP3机组排放的PM2.5中水溶性离子总浓度分别为0.20 mg·m-3和0.06mg·m-3，FP2机组排放水溶性离子以Ca2+和SO42-为主，FP3机组以NH4+和SO42-为主.FP2机组WFGD进出口颗粒物分析结果显示，WFGD过程会通过夹带含石灰石、石膏的脱硫浆液增加水溶性离子排放.在WFGD后加WESP能有效去除PM2.5、PM10颗粒物，降低水溶性离子对大气环境的影响. |
| 英文摘要 |
| Since the introduction of ultra-low emissions, the characteristics of particulate matter (PM) emissions from coal-fired power plants have changed. We quantitatively evaluate the emission characteristics of each component in PM and the impact of purification equipment by analyzing three ultra-low emission units of coal-fired power plants (FP1, FP2, and FP3). A DGI was used to sample particles from the wet flue gas desulfurization (WFGD) unit and wet electrostatic precipitator (WESP) inlet and outlet, which were then analyzed by various methods. The results showed that the mass concentrations of PM1, PM2.5, and PM10 discharged from the outlets of the three units were 0.25-0.38, 0.31-0.42, and 0.42-0.57 mg·m-3, respectively, and that the mass concentration of PM10 discharged under the two kinds of units was equivalent. However, there were differences in the particle size distribution and composition of the particles. In comparison to the FP1 and FP2 units, the PM2.5/PM10 ratio of the FP3 unit was the highest. A possible reason for this is that the unit was equipped with a WESP, which can better remove particle sizes of 2.5 μm or more. The total concentrations of water-soluble ions in PM2.5 discharged from the FP2 and FP3 units were 0.20 and 0.06 mg·m-3, respectively. The water-soluble ions emitted from the FP2 unit were mainly Ca2+ and SO42-, whereas those mainly emitted from the FP3 unit were NH4+ and SO42-. Analysis of the PM from the WFGD import and export of the FP2 unit showed that the WFGD process increased the water-soluble ion discharge by entraining the desulfurization slurry containing limestone and gypsum. Addition of a WESP after WFGD can effectively remove PM2.5 and PM10 particles and reduce the influence of water-soluble ions on the atmospheric environment. |
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