Thermochemical and Toxic Element Behavior during Co-Combustion of Coal and Municipal Sludge |
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| Authors: | Yongchun Chen Herong Gui Ziwei Xia Xing Chen Liugen Zheng |
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| Affiliation: | 1.National Engineering Laboratory for Protection of Coal Mine Eco-Environment, Huainan 232001, China;2.National Engineering Research Center of Coal Mine Water Hazard Controlling, Suzhou University, Suzhou 234000, China;3.School of Resource and Environment Engineering, Anhui University, 111 Jiulong Road, Hefei 230601, China; (Z.X.); (X.C.);4.Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei 230601, China |
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| Abstract: | The thermochemical and kinetic behavior of co-combustion of coal, municipal sludge (MS) and their blends at different ratios were investigated by thermogravimetric analysis. Simulation experiments were performed in a vacuum tube furnace to determine the conversion behavior of toxic elements. The results show that the combustion processes of the blends of coal and municipal sludge are divided into three stages and the combustion curves of the blends are located between those of individual coal and municipal sludge samples. The DTGmax of the sample with 10% sludge addition reaches a maximum at the heating rate of 20 °C/min, indicating that the combustion characteristics of coal can be improved during co-combustion. Strong interactions were observed between coal and municipal sludge during the co-combustion. The volatilization rates of toxic elements decrease with an increasing proportion of sludge in the blends during co-combustion, which indicates that the co-combustion of coal and sludge can effectively reduce the volatilization rate of toxic elements. The study reflects the potential of municipal sludge as a blended fuel and the environmental effects of co-combustion of coal and municipal sludge. |
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| Keywords: | coal municipal sludge co-combustion thermochemical analysis toxic elements |
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