Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes
Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the prod...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/14/3860 |
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| author | Mária Hagarová Milan Vaško Miroslav Pástor Gabriela Baranová Miloš Matvija |
| author_facet | Mária Hagarová Milan Vaško Miroslav Pástor Gabriela Baranová Miloš Matvija |
| author_sort | Mária Hagarová |
| collection | DOAJ |
| description | Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube. |
| first_indexed | 2024-03-10T09:33:40Z |
| format | Article |
| id | doaj.art-b4543c7fcd0048fa9d800612fed77a24 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T09:33:40Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-b4543c7fcd0048fa9d800612fed77a242023-11-22T04:15:54ZengMDPI AGMaterials1996-19442021-07-011414386010.3390/ma14143860Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator TubesMária Hagarová0Milan Vaško1Miroslav Pástor2Gabriela Baranová3Miloš Matvija4Institute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, 04200 Košice, SlovakiaDepartment of Applied Mechanics, Faculty of Mechanical Engineering, University of Žilina, 01026 Žilina, SlovakiaDepartment of Applied Mechanics and Mechanical Engineering, Faculty of Mechanical Engineering, Technical University of Košice, 04200 Košice, SlovakiaInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, 04200 Košice, SlovakiaInstitute of Materials and Quality Engineering, Faculty of Materials, Metallurgy and Recycling, Technical University of Košice, 04200 Košice, SlovakiaCorrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube.https://www.mdpi.com/1996-1944/14/14/3860municipal waste incineratorcorrosionsteel surfaceflue gaschloridesfeedwater |
| spellingShingle | Mária Hagarová Milan Vaško Miroslav Pástor Gabriela Baranová Miloš Matvija Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes Materials municipal waste incinerator corrosion steel surface flue gas chlorides feedwater |
| title | Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes |
| title_full | Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes |
| title_fullStr | Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes |
| title_full_unstemmed | Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes |
| title_short | Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes |
| title_sort | effect of flue gases corrosive components on the degradation process of evaporator tubes |
| topic | municipal waste incinerator corrosion steel surface flue gas chlorides feedwater |
| url | https://www.mdpi.com/1996-1944/14/14/3860 |
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