Characterizing fly ash particles followed by prediction of removal efficiencies of fly ash and CO2 in an Indian Wet ESP
Characterizing fly ash particles followed by prediction of removal efficiencies of fly ash and CO2 in an Indian Wet ESP
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DOI：
10.1016/j.jece.2015.10.041
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发表时间：
2016-03
影响因子：
7.7
通讯作者：
P. K. Mandal;A. Bandyopadhyay
中科院分区：
文献类型：
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作者：
P. K. Mandal;A. Bandyopadhyay
本文报道了印度加尔各答M/S热电厂附设的湿式电除尘器(WESP)对飞灰颗粒的表征及其对飞灰和二氧化碳的去除效率的预测。对从WESP出入口和沉淀池收集的飞灰样品进行了表征，包括粒度分布、比表面积和孔容分析、傅立叶变换红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)和测量飞灰样品的pH值。样品的比表面积分别为3.292、3.641和9.809μ/g。红外光谱分析表明样品中含有莫来石、石英和二氧化硅。X-射线衍射仪分析表明，样品的矿物组成主要为石英和莫来石，并含有少量石灰、赤铁矿和磁铁矿。FTIR、BET和扫描电子显微镜分析的观察结果与所测定的颗粒大小趋势一致。在FTIR分析的基础上，进一步进行了X射线衍射分析。从沉淀池中收集的颗粒在碱处理前后的pH值分别为1.45和7.12。酸性气体的洗涤是导致酸性范围内pH降低的原因。最后，通过多元非线性回归分析，建立了不同系统变量对飞灰和二氧化碳脱除效率的预测关系。预测值与实测值吻合较好(飞灰和二氧化碳脱除的−偏差分别为4.36%和+10%)。
In this article, characterization of fly ash particles followed by prediction of removal efficiencies of fly ash and CO2by a wet electrostatic precipitator (WESP) attached to a coal fired thermal power plant of M/s CESC Ltd., located in Kolkata, India is reported. The characterization of the fly ash samples collected from the inlet and exit of the WESP as well as from the settling tank includes particle size distribution, Brauner–Emmette–Teller (BET) surface area and pore volume analyses, Fourier transform infra red (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and measuring the pH of fly ash samples. The area mean diameters of the respective samples were 39.73, 4.32 and 12.04 μm. The BET surface areas of the respective samples were 3.292, 3.641 and 9.809 m2/g. The peaks observed from FTIR analyses of the samples indicated presence of mullite, quartz and silica. The XRD of the samples showed the major mineralogical components as quartz and mullite with traces of lime, hematite and magnetite. The observations made from FTIR, BET and SEM analyses followed the trend of the particle size determined. XRD analyses further followed the results obtained in FTIR analyses. The values of pH of the particles collected from the settling tank before and after alkaline treatment were observed to be 1.45 and 7.12 respectively. Scrubbing of acidic gases was responsible for the reduction of pH in the acidic range. Finally, separate correlations were developed to predict the fly ash and CO2removal efficiencies by the WESP as functions of different system variables by multiple non-linear regression analysis. The predicted values agreed well with the measured values (−4.36% and +10% deviations for fly ash and CO2removals respectively).