随着我国双碳战略目标提出,电站锅炉向高参数方向发展。为研究新疆典型高氯煤在高参数锅炉焚烧过程中可能存在的腐蚀问题,探索防护措施,模拟了高参数下燃用高氯煤的锅炉气氛,对比了Super304、T92、C-HRA-5、TP347H和12Cr1MoV的抗氯腐蚀能力并研究腐蚀温度(600、650和700℃)对氯腐蚀特性的影响。同时探究不同氧化钇质量分数(0%、0.2%、0.4%、0.6%和0.8%)的Inconel625涂层的抗氯腐蚀能力。结果表明:腐蚀温度对材料的抗氯腐蚀能力影响很大,当温度高于700℃时,Super304、T92、C-HRA-5、TP347H和12Cr1MoV均无法满足实际投产使用。在650℃时,C-HRA-5和TP347H表现良好,其拟合的腐蚀增重曲线分别为:y2=312.371x,R2=0.96和y=1.927x,R2=0.94。Inconel625涂层明显提高了12Cr1MoV基体抗氯腐蚀能力。随着涂层中氧化钇含量增加,抗氯腐蚀效果呈先升高后降低趋势,添加0.4%氧化钇效果最好。

With the proposal of the national dual carbon strategy, power station boilers tend to develop towards high parameters. In order toinvestigate the chlorine corrosion that may exist during the combustion of typical high-chlorine coal in Xinjiang in high-parameter boilersand to investigate its protective measures, the chlorine corrosion resistance of Super 304, T92, C-HRA-5, TP347H, and 12Cr1MoVwere compared and the effect of corrosive temperatures (600, 650, and 700 ℃ ) on the chlorine corrosion characteristics were investigatedin the atmosphere of simulating burning high - chlorine coal in high - parameter boilers. The chlorine corrosion resistance of Inconel625 coatings with different yttrium oxide contents (0%, 0.2%, 0.4%, 0.6% and 0.8%) were also studied. The results show that the corrosion temperature has a great influence on the chlorine corrosion resistance of the material, and when the temperature is higher than700 ℃ , some of the materials will have great deformation, and Super 304, T92, C-HRA-5, TP347H and 12Cr1MoV are unable to meetthe actual production use. At 650 ℃ , C-HRA-5 and TP347H perform better with fitted corrosion weight gain curves of y2 = 312.371x,R2 = 0.96 and y= 1.927x,R2 = 0.94. Inconel 625 coating significantly improves the 12Cr1MoV substrate resistance to chloride corrosion.With the increase of yttrium oxide content in the coating, the anti-chlorine corrosion effect shows a trend of first increase and then decrease, adding 0.4% yttrium oxide has the best effect.

0 引言

1 试验

   1.1 材料

   1.2 高温腐蚀试验系统及方法

2 结果及讨论

   2.1 温度对不同材料氯腐蚀的影响

   2.2 不同材料氯腐蚀的对比

   2.3 不同涂层对氯腐蚀的影响

   2.4 腐蚀样品的SEM-EDS分析

3 结论