Compositional Analysis and Numerical Simulation of Slagging Process on a Water-Cooled Wall of an MSW Incinerator

Shanping Chen, Tianyuan Jia, Yong Chen, Lijie Yin (), Jingkuan Huang and Guoan Yuan
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Shanping Chen: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Tianyuan Jia: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Yong Chen: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Lijie Yin: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Jingkuan Huang: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China
Guoan Yuan: Thermal & Environmental Engineering Institute, Tongji University, Shanghai 200092, China

Waste, 2025, vol. 3, issue 1, 1-14

Abstract: The mechanism of slagging in municipal solid waste incinerators is complex, and the slagging process is simultaneously affected by the composition, temperature, and flue gas flow. In this study, slag samples on a water-cooled wall were first analysed, and the key components and fusion temperatures were measured. Second, a gas-phase combustion model of an incinerator was established, and the temperature and velocity distributions of the flue gas inside the incinerator were calculated. Based on the incineration process, coupled with a discrete-phase model, a numerical simulation model of the slagging process on the water-cooled wall of the incinerator was constructed, considering the transport and adhesion processes of ash particles. The influence of parameters such as the ash particle size and concentration on the degree of slagging on the water-cooled wall was analysed. Smaller ash particles were less likely to adhere to water-cooled walls, with approximately 2.72% of ash particles with a particle size of 10 mm adhering to water-cooled walls. The proportion of ash particles with a particle size of 50 mm adhering to water-cooled walls was approximately three times that of those with a particle size of 10 mm. As the concentration of ash particles increased, the number of ash particles adhering to the water-cooled wall increased, and the adhesion ratio decreased. These results are of great significance for optimising the operation of incinerators and reducing slagging rates.

Keywords: incinerator; slagging; numerical simulation; water-cooled wall (search for similar items in EconPapers)
JEL-codes: Q1 Q16 Q18 Q2 Q20 Q23 Q24 Q25 Q28 Q3 Q31 Q38 Q5 (search for similar items in EconPapers)
Date: 2025
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