Molecular Dynamics Simulation of Low Temperature Corrosion Mechanism of Waste Incinerator

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Molecular Dynamics Simulation of Low Temperature Corrosion Mechanism of Waste Incinerator

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[1]TANG Songzhen,HAN Kui,ZHOU Junjie.Molecular Dynamics Simulation of Low Temperature Corrosion Mechanism of Waste Incinerator[J].Journal of Zhengzhou University (Engineering Science),2023,44(04):48-53.[doi:10.13705/j.issn.1671-6833.2023.01.016]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 04 Page number: 48-53 Column: Public date: 2023-06-01

Title:: Molecular Dynamics Simulation of Low Temperature Corrosion Mechanism of Waste Incinerator

Author(s):: TANG Songzhen; HAN Kui; ZHOU Junjie; School of Mechanical and Power Engineering, Zhengzhou University, 450001, Zhengzhou, Henan

Keywords:: waste incineration; low temperature corrosion; sulfuric acid; molecular dynamics; coating

CLC:: TQ051.5；TK223.3

DOI:: 10.13705/j.issn.1671-6833.2023.01.016

Abstract:: Aiming at the problem of low temperature corrosion on the surface of the heat exchanger in the waste incineration system, the corrosion process of sulfuric acid molecules on the surface of nickel alloy coatings was simulated by molecular dynamics research methods, the corrosion rates of different coatings were explored, and the corrosion process model was established. The results show that H2 SO4 dissociates two hydroxide ions on the surface of nickel metal coating, and the decomposed O—H ions and O—S—O ions are captured by the Surface of Ni metal seperatively. O in O—H ions forms bond chains with Ni atoms only. Compared with aluminum oxide, nickel alloy and nickel chromium alloy, nickel chromium alloy has the best inhibition effect on the initial slagging layer, while nickel alloy coating has the worst inhibition effect. The selection of coating materials with strong oxidation resistance can effectively reduce the phenomenon of low temperature corrosion on the surface of the heating surface of the waste incineration system.

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