CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China.
CAS Key Laboratory of Crust-Mantle Materials and Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, The Chinese Academy of Sciences, Xi'an, Shaanxi, 710075, China.
Chemosphere. 2019 Oct;233:440-451. doi: 10.1016/j.chemosphere.2019.05.256. Epub 2019 Jun 1.
A combination of thermogravimetric analysis and lab-scale fixed bed combustion experiments was carried out to study the thermochemical, kinetic and heavy metals emission behavior during co-combustion of industrial coal slurry (CS) and sewage sludge (SS). The results found that the blends had integrative combustion profiles which reflected both coal slurry and sewage sludge. During co-combustion, the ignition performance of CS could be significantly improved with the addition of SS. Synergetic effects of the co-combustion were observed at lower temperature, while the high-temperature char combustion of the blends was inhibited because of high ash components of SS or formation of inactive alkali metal aluminosilicates. Kinetic analysis confirmed the improve iginition behavior of blends. Both the comprehensive combustibility index S and the activation energy suggested that the blends with 20% SS may have the best promoting effects. Compared with CS, the higher concentration of Cl in SS increased the volatilization ratios of Cu, Zn, As, and Pb. When added CS into SS, the volatilization ratios of arsenic decreased during combustion. The inhibition effects for arsenic during co-combustion might be associated with the capture of arsenic vapors by the new-formed Ca/Al from CS thermal decomposition.
采用热重分析和实验室固定床燃烧实验相结合的方法，研究了工业煤浆（CS）和污水污泥（SS）共燃烧过程中的热化学、动力学和重金属排放特性。结果表明，混合物具有综合燃烧曲线，反映了煤浆和污水污泥的特性。在共燃烧过程中，SS 的添加可显著提高 CS 的点火性能。在较低温度下观察到协同效应，而由于 SS 高灰分成分或形成非活性碱金属铝硅酸盐，混合物的高温焦炭燃烧受到抑制。动力学分析证实了混合物的点火性能得到改善。综合燃烧指数 S 和活化能均表明，添加 20% SS 的混合物可能具有最佳的促进效果。与 CS 相比，SS 中较高浓度的 Cl 增加了 Cu、Zn、As 和 Pb 的挥发率。当 CS 添加到 SS 中时，燃烧过程中砷的挥发率降低。在共燃烧过程中对砷的抑制作用可能与新形成的 CS 热解产生的 Ca/Al 对砷蒸气的捕获有关。
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