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Catalysts 2019, 9(2), 182;

Experimental Studies on Co-Combustion of Sludge and Wheat Straw

Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
Author to whom correspondence should be addressed.
Received: 17 January 2019 / Revised: 29 January 2019 / Accepted: 12 February 2019 / Published: 15 February 2019
(This article belongs to the Special Issue Catalytic Biomass to Renewable Biofuels and Biomaterials)
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This work presents studies on the co-combustion of sludge and wheat straw (30 wt % sludge + 70 wt % wheat straw). Prior to the combustion experiment, thermogravimetric analysis was performed to investigate the combustion characteristic of the blended fuel. Results indicated that the blended fuel could remedy the defect of each individual component and also promote the combustion. Co-combustion experiments were conducted in a lab-scale vertical tube furnace and the ash samples were analyzed by Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM). Thermodynamic calculations were also made to study the interactions that occurred. Addition of sludge could raise the melting point of wheat straw ash and reduce the slagging tendency. Co-combustion also restrained the release of K and transferred it into aluminosilicate and phosphate. Transfer of Pb and Zn in the co-combustion was also studied. The release and leaching toxicity of the two heavy metals in the co-combustion were weakened effectively by wheat straw. PbCl2(g) and ZnCl2(g) could be captured by K2SiO3 in wheat straw ash particles and generate silicates. Interactions that possibly occurred between K, Zn, and Pb components were discussed at the end of the paper. View Full-Text
Keywords: sludge; wheat straw; co-combustion; thermodynamic calculation sludge; wheat straw; co-combustion; thermodynamic calculation

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Xue, Z.; Zhong, Z.; Zhang, B. Experimental Studies on Co-Combustion of Sludge and Wheat Straw. Catalysts 2019, 9, 182.

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