| LIU Yu-gang,LIU Yin-he,MO Chun-hong,PAN Shao-cheng,RAN Shen-ming,ZHANG Min-qiang.High Temperature Corrosion of S31035 for 630 ℃ Coal-fired Power Plant Boiler[J],51(4):176-182 |
| High Temperature Corrosion of S31035 for 630 ℃ Coal-fired Power Plant Boiler |
| Received:June 30, 2021 Revised:August 28, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.04.017 |
| KeyWord:630 ℃ boiler S31035 coal ash high temperature corrosion sulfate |
| Author | Institution |
| LIU Yu-gang |
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an , China;Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province, Chengdu , China;Dongfang Boiler Group Co., Ltd., Sichuan Zigong , China |
| LIU Yin-he |
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an , China |
| MO Chun-hong |
Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province, Chengdu , China;Dongfang Boiler Group Co., Ltd., Sichuan Zigong , China |
| PAN Shao-cheng |
Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province, Chengdu , China;Dongfang Boiler Group Co., Ltd., Sichuan Zigong , China |
| RAN Shen-ming |
Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province, Chengdu , China;Dongfang Boiler Group Co., Ltd., Sichuan Zigong , China |
| ZHANG Min-qiang |
Dongfang Boiler Group Co., Ltd., Sichuan Zigong , China |
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| Abstract: |
| The work aims to study high temperature sulfur corrosion resistance of S31035, which is used as the key candidate tube of high-temperature heating surface of 630 ℃ boiler. Corrosion tests were conducted by placing S31035 steel coated by high or low alkali coal ash in simulated flue gas (700 ℃, SO2 volume concentration of 0.3%). The samples were weighted at intervals during the test, then corrosion kinetics curve was plotted. The macro characteristics of the samples were observed, and the surface/cross-section morphology and composition of the corrosion products were analyzed by X-ray diffraction equipment, electron microscope and energy dispersive spectrometer. The results showed that the S31035 steel undergone corrosion after coated by low alkali coal ash, with relatively dense (FeCr)2O3 oxide film on the surface of the sample. Meanwhile corrosion product film was very thin. However, the corrosion products grew in layer and peeled off severely in the high alkali coal ash, weight loss exceeded 27 mg/cm2 after 2 000 h. Cr and S were enriched in the corrosion layer, resulting in serious high temperature sulfur corrosion. It showed that the alkali metal content of coal ash was the key factor affecting the high temperature sulfur corrosion resistance of S31035. In the same high sulfur environment, the high temperature sulfur corrosion resistance for low alkali coal ash was good, but for high alkali coal ash was poor. S31035 can be applied to the high temperature heat exchange components of 630 ℃ coal-fired boiler. When burning high sulfur coal with high alkali coal ash, the high temperature corrosion can be inhibited by strengthening the removal of coal ash on the surface of heating surface. |
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