生物质锅炉12Cr1MoV二级过热器腐蚀原因
Corrosion of 12Cr1MoV Super-heater in a Biomass Fired Boiler
摘 要
国内某台振动炉排的生物发电锅炉, 累计运行仅200天后, 二级过热器(材质为12Cr1MoVG)外壁即发生严重的腐蚀。对管子外壁附近进行了显微组织、EDS成分和XRD分析。发现: 腐蚀优先沿晶界发展, 腐蚀前沿富含氯离子。认为生物质燃料中的氯离子是造成管子外壁腐蚀的主要原因, 而碱金属的存在由于形成低熔点共晶物会促进腐蚀过程。提出了降低腐蚀速率的措施。
过热器
12Cr1MoV
腐蚀
措施
biomass boiler
super-heater
12Cr1MoV
corrosion
measure
Abstract
The 12Cr1MoV secondary super-heater of a biomass vibration grate boiler suffered serious surface corrosion after service for only 200 h. Tubes were analyzed by optical microscopy, EDX and XRD. Grain boundary attack was found, and Cl- was rich at reaction front. The corrosion was ascribed mainly to Cl- in the biomass. The existence of alkali metal may promote the corrosion process because it tends to form low melting point salts. Some measures were proposed to reduce the corrosion rate.
中图分类号 TG172
所属栏目 失效分析
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收稿日期 2011/9/29
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联系人作者刘蕊(elf_213@163.com)
备注刘蕊,工程师,硕士,
引用该论文: LIU Rui,YUE Zeng-wu. Corrosion of 12Cr1MoV Super-heater in a Biomass Fired Boiler[J]. Corrosion & Protection, 2012, 33(9): 823
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参考文献
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【2】Miltner A,Beckmann G,Freidl A. Preventing the chlorine-induced high temperature corrosion in power boilers without loss of electrical efficiency in steam cycles[J]. Applied Thermal Engineering,2006(26):2005-2011.
【3】Markus Brostrom,Hakan kassman,Anna Helgesson,et al. Sulfation of corrosive alkali chlorides by ammonium sulfate in a biomass fired CFB boiler[J]. Fuel Processing Technology,2007(88):1171-1777.
【4】Henderson P,Szakalos P,Pettersson R,et al. Reducing superheater corrosion in wood-fired boilers[J]. Materials and Corrosion,2006,57(2):128-134.
【5】Cha S C,Spiegel M. Local reactions of KCl particles with iron,nickel and chromium surfaces[J]. Materials and Corrosion,2006,57(2):159-164.
【6】Jan Sandberg,Christer Kalsson,Rebei Bel Fdhila. A 7 year long measurement period investigating the correlation of corrosion,deposit and fuel in a biomass fired circulated fluidized bed boiler[J]. Applied Energy,2011(88):99-110.
【7】Martti Aho,Pasi Vainikka,Raili Taipale,et al. Effective new chemicals to prevent corrosion due to chlorine in power plant superheaters[J]. Fuel,2008(87):647-654.
【8】Grabke H J,Reese E,Spiegel M. The effects of chlorides, hydrogen chloride,and sulfur dioxide in the oxidation of steels below deposits[J]. Corrosion Science,1995,37(7):1023-1043.
【9】Demirbas A. Combustion characteristics of different biomass fuels[J]. Progress in Energy and Combustion Science,2004,30(2):219-230.
【10】Jensen P A,Sander B,Dam-Johansen K. Pretreatment of straw for power production by pyrolysis and char wash[J]. Biomass & Bioenergy,2001(20):431-446.
【11】Khan A A,Jong W D,Jansens P J,et al. Biomass combustion in fluidized bed boilers-potential problems and remedies[J]. Fuel Processing Technology,2009(90):21-50.
【12】Leckner B. Fluidized bed combustion:Mixing and pollutant limitation[J]. Progress in Energy and Combustion Science,1998,24(1):31- 61.
【13】Montgomery M,Vilhelmsen T,Jensen S A. Potential high temperature corrosion problems due to co-firing of biomass and fossil fuels[J]. Materials and Corrosion,2008,59(10):783-793.
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