Corrosion Analysis of High-Temperature Superheater Tubes of a Waste Incineration Boiler

QU Yanmiao, YUAN Wei, XU Yunfeng, LI Hao

doi:10.16577/j.issn.1001-1560.2025.0032

Materials Protection >

2025 , Vol. 58 >Issue 2: 131 - 142

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0032

Corrosion Analysis of High-Temperature Superheater Tubes of a Waste Incineration Boiler

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(1.Henan Boiler and Pressure Vessel Inspection Technology Research Institute， Zhengzhou 450016， China；2a.Analytical Testing and Instrument Sharing Center， 2b.Hubei Provincial Engineering Technology Research Center for Marine Engineering Materials and Service Safety， Wuhan University of Science and Technology， Wuhan 430000， China)

QU Yanmiao(1987-)， Master， Senior Engineer， Research Focus: Special Equipment Inspection and NDT Research， Tel.: 0371-89933618， E-mail: qumiao217＠126.com

Received date: 2024-05-14

Revised date: 2024-11-06

Accepted date: 2024-11-10

Online published: 2025-03-21

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Abstract

The corrosion failure of high-temperature superheater tubes in waste incineration boilers is one of the important causes of forced shutdowns.In order to provide reference for the protection of high-temperature superheater tubes on heating surfaces of waste incinerators， this study compared the original high-temperature superheater tubes with those that had been in service for 20 000 h in a waste incineration boiler.The metallographic structures were observed using an optical microscope， while mechanical properties were tested using a tensile testing machine and impact testing machine.Corrosion products on the inner and outer surfaces of the service tubes were analyzed using an electron probe and X-ray diffraction (XRD).The evolution of corrosion behavior of the high-temperature superheater tubes under operational conditions was investigated.Results showed that the 12Cr1MoVG high-temperature superheater tubes experienced significant metallic oxidation corrosion on both the inner and outer walls.A dense iron oxide layer formed on the inner wall，while the corrosion products on the outer wall were divided into two layers: the inner layer being a metallic oxidation corrosion layer， and the outer layer consisting of a thicker alkali metal sulfate corrosion scale.The wall of the service pipe became thinner， the pearlite spheroidization occurred in the inner wall， the pearlite poor zone narrowed in the outer wall， and the core microstructure changed slightly but the grain coarsened slightly.The tensile strength， elongation and impact energy of the tube wall showed little change， but the yield strength decreased by more than 60 MPa.

Key words： waste incineration; boiler; high-temperature superheater tube; high-temperature corrosion; failure

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QU Yanmiao, YUAN Wei, XU Yunfeng, LI Hao . Corrosion Analysis of High-Temperature Superheater Tubes of a Waste Incineration Boiler[J]. Materials Protection, 2025 , 58(2) : 131 -142 . DOI: 10.16577/j.issn.1001-1560.2025.0032

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