墙式对冲燃烧锅炉高温腐蚀原因分析与治理
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摘要
某机组锅炉水冷壁存在高温腐蚀问题,通过试验研究与分析认为,其主要因煤粉刷墙、两侧墙附近呈强还原性气氛以及存在高浓度H2S所致。对此,通过设备改造和专项治理后,两侧墙壁面气氛良好,高温腐蚀发生的条件消除,屏式过热器与高温再热器受热面不再超温,排烟中CO浓度在100μL/L以下,设备改造前后相同试验条件下SCR入口NOx变化在20mg/m3以内。
High temperature corrosion occurred on two sides of water wall in a boiler.Experiment showes the pulverized coal scour on water wall tube,strong reductive atmosphere near side walls and high density of H2 S are the major reasons.Thus,regulations on relative equipments were conducted.After the improvement,the atmosphere at two sides of the water wall turned well,meaning the condition that may lead to high temperature corrosion was eliminated.The temperature at platen superheater and high temperature reheater surface was no longer over high.The CO concentration in flue gas dropped below 100μL/L,and the variation of NOx concentration at inlet of the SCR was within 20mg/m3 under the same experimental conditions before and after the equipment modification.
High temperature corrosion occurred on two sides of water wall in a boiler.Experiment showes the pulverized coal scour on water wall tube,strong reductive atmosphere near side walls and high density of H2 S are the major reasons.Thus,regulations on relative equipments were conducted.After the improvement,the atmosphere at two sides of the water wall turned well,meaning the condition that may lead to high temperature corrosion was eliminated.The temperature at platen superheater and high temperature reheater surface was no longer over high.The CO concentration in flue gas dropped below 100μL/L,and the variation of NOx concentration at inlet of the SCR was within 20mg/m3 under the same experimental conditions before and after the equipment modification.
引文
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[2]梁少华,黄磊,张恩先.锅炉高温腐蚀在线监测技术的研究[J].动力工程,2009,29(12):1093-1095.LIANG Shaohua,HUANG Lei,ZHANG Enxian.Study on on-line monitoring technology for high temperature corrosion of boilers[J].Journal of Power Engineering,2009,29(12):1093-1095.
[3]郭鲁阳,孙旭光,刘志超,等.锅炉水冷壁高温腐蚀原因分析及预防对策[J].中国电力,2000,33(11):17-20.GUO Lu-ang,SUN Xuguang,LIU Zhichao,et al.Causes analysis of high temperature corrosion of boiler water walls and its preventive measures[J].Electric Power,2000,33(11):17-20.
[4]陈鸿伟,李永华,梁化忠.锅炉高温腐蚀实验研究[J].中国电机工程学报,2003,23(1):167-170.CHEN Hongwei,LI Yonghua,LIANG Huazhong.Experimental study on boiler high temperature corrosion[J].Proceedings of the CSEE,2003,23(1):167-170.
[5]刘兆俊.锅炉水冷壁高温腐蚀的原因及对策[J].华电技术,2010,32(1):43-48.LIU Zhaojun.Reason of high temperature corrosion of boiler water wall and countermeasures[J].Water Conservancy&Electric Power Machinery,2010,32(1):43-48.