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Numerical Study of Thermochemistry and Trace Element Behavior during the Co-Combustion of Coal and Sludge in Boiler

School of Low-carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
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Academic Editor: Adam Smoliński
Energies 2022, 15(3), 888; https://doi.org/10.3390/en15030888
Received: 28 December 2021 / Revised: 21 January 2022 / Accepted: 24 January 2022 / Published: 26 January 2022
Sludge is one of the main pollutants from sewage treatment and contains a high content of water and organic matter. The co-combustion of sludge and coal can bring about the energy conversion of sludge. However, the high moisture content in sludge and the inorganic pollutants generated by co-combustion have adverse effects on combustion and the environment. In this work, through experimentation, it was demonstrated that co-combustion does not release obvious toxic elements or create an environmental hazard. On the basis of the TG/DTG curves, the ignition points of sludge and coal and the temperature of each group were obtained, which provided boundary conditions for a numerical simulation. Co-combustion with various mixing ratios and moisture contents was studied via the numerical simulation of a 330 MW boiler. The numerical results show that a high mixing ratio reduced the boiler temperature and created more moisture and fuel NOx. When the mixing ratio reached 40%, the boiler temperature became less than the combustion temperature. Sludge drying improved the internal temperature of the boiler, but it created thermal NOx. When the moisture content decreased to 40%, the temperature in the boiler rose, which improved combustion. View Full-Text
Keywords: sludge; co-combustion; toxic element; numerical simulation; moisture content sludge; co-combustion; toxic element; numerical simulation; moisture content
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MDPI and ACS Style

Liang, D.; Li, Y.; Zhou, Z. Numerical Study of Thermochemistry and Trace Element Behavior during the Co-Combustion of Coal and Sludge in Boiler. Energies 2022, 15, 888. https://doi.org/10.3390/en15030888

AMA Style

Liang D, Li Y, Zhou Z. Numerical Study of Thermochemistry and Trace Element Behavior during the Co-Combustion of Coal and Sludge in Boiler. Energies. 2022; 15(3):888. https://doi.org/10.3390/en15030888

Chicago/Turabian Style

Liang, Di, Yimin Li, and Zhongning Zhou. 2022. "Numerical Study of Thermochemistry and Trace Element Behavior during the Co-Combustion of Coal and Sludge in Boiler" Energies 15, no. 3: 888. https://doi.org/10.3390/en15030888

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