烟气S含量对700 ℃超超临界锅炉候选合金腐蚀行为影响

doi:10.11902/1005.4537.2015.203

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 505-512 DOI: 10.11902/1005.4537.2015.203

本期目录 | 过刊浏览

烟气S含量对700 ℃超超临界锅炉候选合金腐蚀行为影响

李琰^1,²,鲁金涛¹(

),杨珍¹,朱明²,谷月峰¹

1. 西安热工研究院有限公司国家能源清洁高效火力发电技术研发中心西安 710032
2. 西安科技大学材料科学与工程学院西安 710054

Effect of Sulfur Content on Corrosion Behavior of Candidate Alloys Used for 700 ℃ Level A-USC Boiler in Simulated Coal Ash and Flue Gas Environments

Yan LI^1,²,Jintao LU¹(

),Zhen YANG¹,Ming ZHU²,Yuefeng GU¹

1. National Energy R&D Center of Clean and High-efficiency Fossil-fired Power Generation Technology, Xi′an Thermal Power Research Institute Co., Ltd., Xi′an 710032, China
2. College of Materials Science and Engineering, Xi′an University of Science and Technology,Xi′an 710054, China

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摘要:

在不同S含量模拟锅炉煤灰和烟气环境中,研究了两种典型先进超超临界锅炉候选Ni-Co基合金CCA 617和Ni-Fe基合金GH 2984在750 ℃时的热腐蚀行为。结果表明：在0.02%SO₂气氛中,两种合金腐蚀速率均较小,腐蚀层致密性较好,内硫化较轻;在1.5%SO₂气氛中,两种合金腐蚀速率均明显加快,腐蚀层显著增厚并伴随破裂剥落发生,内硫化加剧。在两种S含量气氛中,合金的腐蚀产物基本相同：CCA 617腐蚀产物主要以Cr₂O₃为主,以及少量 (Ni,Co)Cr₂O₄,Al₂O₃和硫化物;GH 2984合金主要为Fe₂O₃,Cr₂O₃,少量NiCr₂O₄和硫化物。基于实验结果讨论了两种合金的腐蚀机理及S含量对合金腐蚀过程的影响。

关键词 ：超超临界, 合金, S含量, 高温腐蚀, 腐蚀机理

Abstract：

Corrosion behavior of two typical advanced ultra-supercritical (A-USC) boiler alloys, Ni-Co based CCA 617 and Fe-Ni based GH 2984, in simulated coal ash and flue gas environments with different sulfur content at 750 ℃ was studied. Results indicated that in the 0.02%SO₂ containing environment, the corrosion rate of the two alloys was slow and the formed oxide scale was compact, dense and adherent to the substrate, while there existed only minor inner sulfides beneath the oxide scale. In the 1.5%SO₂ containing environment, the corrosion rate was increase significantly, and the oxide scale thickened and suffered from spallation, while the inner sulfidation became significant. In the environments with different sulfur contents, the two alloys formed more or less the same corrosion products: the corrosion products of GH 2984 consisted of Fe₂O₃, Cr₂O₃, minor NiCr₂O₄ and sulfide; while that of CCA 617 consisted mainly of Cr₂O₃ with a small amount of (Ni, Co)Cr₂O₄, Al₂O₃and sulfide. Besides, the corrosion mechanism and the effect of sulfur content on the corrosion process of two alloys were also discussed.

Key words： A-USC alloy sulfur content high temperature corrosion corrosion mechanism

基金资助:国家自然科学基金项目 (51301130和51401163) 及中国华能集团公司重点科技项目资助

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引用本文:

李琰,鲁金涛,杨珍,朱明,谷月峰. 烟气S含量对700 ℃超超临界锅炉候选合金腐蚀行为影响[J]. 中国腐蚀与防护学报, 2016, 36(5): 505-512.
Yan LI, Jintao LU, Zhen YANG, Ming ZHU, Yuefeng GU. Effect of Sulfur Content on Corrosion Behavior of Candidate Alloys Used for 700 ℃ Level A-USC Boiler in Simulated Coal Ash and Flue Gas Environments. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 505-512.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.203 或 https://www.jcscp.org/CN/Y2016/V36/I5/505

图1 实验装置示意图

表1 CCA 617和GH 2984合金的化学成分

表2 腐蚀实验中烟气成分

图2 CCA 617和GH 2984合金在750 ℃下SO2气氛中的腐蚀增重曲线

图3 CCA 617和GH 2984合金在750 ℃SO2气氛中腐蚀500 h后腐蚀产物的XRD谱

图4 CCA 617合金在750 ℃下SO2气氛中腐蚀500 h后氧化膜的形貌

图5 GH 2984合金在750 ℃下SO2气氛中腐蚀500 h后氧化膜的形貌

图6 合金在750 ℃高硫气氛中腐蚀500 h后腐蚀层成分扫描图

图7 CCA 617合金腐蚀过程示意图

图8 GH 2984合金腐蚀过程示意图

图9 M-O-S 体系平衡相图

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