Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water

More attention has been paid to the exfoliation of oxide scale on high-temperature heating surface of utility boiler. The oxidation mechanism of HCM12A steel in supercritical water is proposed and the growth of oxide film is simulated. The duplex scale contains an outer magnetite layer and an inner...

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Autores principales:	Sun Li, Yan Weiping
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	supercritical water hcm12a thickness oxide scale pores Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
Acceso en línea:	https://doaj.org/article/dd225112dcc94ef9963a468edbb2c871
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spelling	oai:doaj.org-article:dd225112dcc94ef9963a468edbb2c8712021-12-05T14:10:50ZAnalysis of oxide scale thickness and pores position of HCM12A steel in supercritical water2191-032410.1515/htmp-2021-0016https://doaj.org/article/dd225112dcc94ef9963a468edbb2c8712021-03-01T00:00:00Zhttps://doi.org/10.1515/htmp-2021-0016https://doaj.org/toc/2191-0324More attention has been paid to the exfoliation of oxide scale on high-temperature heating surface of utility boiler. The oxidation mechanism of HCM12A steel in supercritical water is proposed and the growth of oxide film is simulated. The duplex scale contains an outer magnetite layer and an inner Cr-rich spinel layer. According to the data of Backhaus and Töpfer, the diffusion coefficient values of iron in magnetite layer are discussed and the function of R V, RI{R}_{\text{I}} for oxygen activity can be used for calculation of iron diffusion coefficients in Cr-rich spinel layer. Based on Wagner’s oxidation theory, the oxidation rate constants of HCM12A are calculated at 500 and 600°C in supercritical water, compared with experimental data of the relevant literatures. The oxygen activities at the interfaces of alloy/Cr-rich spinel oxide and magnetite/supercritical water are estimated. The simulation results of weight gain are matched with the test data. The iron diffusion mechanisms inside the magnetite layer and the Cr-rich spinel layer are analyzed. The iron diffusion coefficient at the interface of Cr-rich spinel/magnetite is discontinuous, while the oxygen activity is continuous in the whole double layer. The thickness of oxide scale on inner tube walls of the final superheater coils (T91) of a 600 MW supercritical boiler is calculated by using the calculation method provided by the paper. The modeling results, the measured data, and the calculation results by the method are compared. Accurate calculation of the thickness of the inner and outer oxide scales can provide a necessary basis for predicting the stress and exfoliation of oxide scales.Sun LiYan WeipingDe Gruyterarticlesupercritical waterhcm12athicknessoxide scaleporesTechnologyTChemical technologyTP1-1185Chemicals: Manufacture, use, etc.TP200-248ENHigh Temperature Materials and Processes, Vol 40, Iss 1, Pp 53-65 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	supercritical water hcm12a thickness oxide scale pores Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
spellingShingle	supercritical water hcm12a thickness oxide scale pores Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248 Sun Li Yan Weiping Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
description	More attention has been paid to the exfoliation of oxide scale on high-temperature heating surface of utility boiler. The oxidation mechanism of HCM12A steel in supercritical water is proposed and the growth of oxide film is simulated. The duplex scale contains an outer magnetite layer and an inner Cr-rich spinel layer. According to the data of Backhaus and Töpfer, the diffusion coefficient values of iron in magnetite layer are discussed and the function of R V, RI{R}_{\text{I}} for oxygen activity can be used for calculation of iron diffusion coefficients in Cr-rich spinel layer. Based on Wagner’s oxidation theory, the oxidation rate constants of HCM12A are calculated at 500 and 600°C in supercritical water, compared with experimental data of the relevant literatures. The oxygen activities at the interfaces of alloy/Cr-rich spinel oxide and magnetite/supercritical water are estimated. The simulation results of weight gain are matched with the test data. The iron diffusion mechanisms inside the magnetite layer and the Cr-rich spinel layer are analyzed. The iron diffusion coefficient at the interface of Cr-rich spinel/magnetite is discontinuous, while the oxygen activity is continuous in the whole double layer. The thickness of oxide scale on inner tube walls of the final superheater coils (T91) of a 600 MW supercritical boiler is calculated by using the calculation method provided by the paper. The modeling results, the measured data, and the calculation results by the method are compared. Accurate calculation of the thickness of the inner and outer oxide scales can provide a necessary basis for predicting the stress and exfoliation of oxide scales.
format	article
author	Sun Li Yan Weiping
author_facet	Sun Li Yan Weiping
author_sort	Sun Li
title	Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
title_short	Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
title_full	Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
title_fullStr	Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
title_full_unstemmed	Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water
title_sort	analysis of oxide scale thickness and pores position of hcm12a steel in supercritical water
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/dd225112dcc94ef9963a468edbb2c871
work_keys_str_mv	AT sunli analysisofoxidescalethicknessandporespositionofhcm12asteelinsupercriticalwater AT yanweiping analysisofoxidescalethicknessandporespositionofhcm12asteelinsupercriticalwater
_version_	1718371693578158080

Analysis of oxide scale thickness and pores position of HCM12A steel in supercritical water

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