Formation and Growth Behavior Analysis of Slagging Rings in Rotary Kiln-Type Hazardous Waste Incineration Systems

Jing Zhao, Zirui Zhang, Bo Li and Xiaolin Wei
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Jing Zhao: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Zirui Zhang: State Key Laboratory of High-Temperature Gas Kinetics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Bo Li: State Key Laboratory of High-Temperature Gas Kinetics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
Xiaolin Wei: State Key Laboratory of High-Temperature Gas Kinetics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2021, vol. 14, issue 22, 1-14

Abstract: Rotary kiln incineration technology has the advantages of strong material adaptability and a simple treatment process and has been widely used in hazardous waste treatment. However, the actual incineration process has caused problems such as ring formation in the treatment system due to the lack of research on the slagging mechanisms. In this paper, slagging phenomena occurring in the second half of the rotary kiln, the exit flue of the secondary combustion chamber, and the wall of the quench tower are analyzed and discussed in detail through characterization methods. The results indicate that the adhesion of low-melting alkali metal salts on the refractory surface in the second half of the rotary kiln is the key factor in forming the initial slagging layer. In the growth process of the slagging ring, the formed liquid phase can bond incineration residues of different sizes together and form a dense embryo body through liquid phase sintering. The deposition and solidification of molten/semi-molten fly ashes cause slagging formation in the exit flue of the secondary combustion chamber. The slagging phenomenon occurring in the inner wall of the quench tower belongs to the “crystalline-coalesce-hardening” process of the inorganic salts precipitating out of the high-salt wastewater.

Keywords: rotary kiln; hazardous waste treatment; slagging phenomena; characterization methods; mechanism analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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