超临界机组疏水系统发生流动加速腐蚀的影响因素以及预防
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摘要
电厂汽水管道运行中流动加速腐蚀(FAC)现象普遍存在,危及电厂安全。随着机组参数的提高,针对超临界机组,通过模拟与现场实时数据分析得到疏水系统与给水系统一样存在较高的流动加速腐蚀现象。流体动力学、环境和材料因素是造成流动加速腐蚀的主要因素。由沧东电厂660 MW超临界机组的实时数据分析得到p H值、电导率、含氧量对其疏水系统发生流动加速腐蚀的影响关系,结合其采用的水处理方式,分析超临界机组疏水系统发生FAC的机理和原因,给出预防和抑制超临界机组疏水系统发生流动加速腐蚀的有效措施。
In the operation of the power plant soda pipe,flow accelerated corrosion is widespread,which seriously affects the safe operation of the power plant. With the increase of unit parameters,according to real-time data analysis of simulation and real-time data for the supercritical units,there is a high flow accelerated corrosion phenomenon of the hydrophobic system and the water supply system. The main factors affecting the flow accelerated corrosion are fluid dynamic,environmental and material factor. The influence of p H value,conductivity and oxygen content on the flow accelerated corrosion in the hydrophobic system of Cangdong Power Plant was obtained by real-time data analysis of 660 MW supercritical unit and combined with its water treatment processes adopted,the formation mechanism and reason of FAC in supercritical units are analyzed and the effective measures to prevent the flow accelerated corrosion of supercritical hydrophobic system are given.
In the operation of the power plant soda pipe,flow accelerated corrosion is widespread,which seriously affects the safe operation of the power plant. With the increase of unit parameters,according to real-time data analysis of simulation and real-time data for the supercritical units,there is a high flow accelerated corrosion phenomenon of the hydrophobic system and the water supply system. The main factors affecting the flow accelerated corrosion are fluid dynamic,environmental and material factor. The influence of p H value,conductivity and oxygen content on the flow accelerated corrosion in the hydrophobic system of Cangdong Power Plant was obtained by real-time data analysis of 660 MW supercritical unit and combined with its water treatment processes adopted,the formation mechanism and reason of FAC in supercritical units are analyzed and the effective measures to prevent the flow accelerated corrosion of supercritical hydrophobic system are given.
引文
[1]蒋东方.超临界机组汽水系统腐蚀产物迁徙过程研究[D].北京:华北电力大学(北京),2017.
[2]R B Dooley,V K Chexal.Flow-accelerated corrosion of pressure vessels in fossil plants[J].International Journal of Pressure Vessels and Piping,2000,77(2):85-90.
[3]李志刚,田泽中,黄万启,等.直接空冷300MW机组凝汽器流动加速腐蚀研究[J].热力发电,2011,40(12):34-37.
[4]C Sanama,M Sharifpur,J P Meyer.Mathematical modeling of orifice downstream flow under flow-accelerated corrosion[J].Nuclear Engineering and Design,2018,326(1):285-289.
[5]张国军.电站汽水系统流动加速腐蚀机理及对策研究[D].北京:华北电力大学,2014.
[6]Md Aminul Islam,Zoheir Farhat.Erosion-corrosion mechanism and comparison of erosion-corrosion performance of API steels[J].Wear,2017,376/377(4):533-541.
[7]John M pietralik,Chris S Schefski,et al.Flow and mass transfer in bends under flow accelerated corrosion wall thinning conditions[J].Journal of Engineering for Gas Turbines and Power,2009,133(1):493-501.
[8]Masatoshi Kondo,Takeo Muroga,Akio Sagara,et al.Flow accelerated corrosion and erosion-corrosion of RAFMsteel in liquid breeders[J].Fusion Engineering and Design,2011,86(9):2500-2503.
[9]孟龙,黄万启,孙本达,等.直接空冷凝汽器流动加速腐蚀的影响因素[J].热力发电,2014,43(12):118-122.
[10]张桂英,顾宇,邵杰.核电站汽水管道流动加速腐蚀的影响因素分析及对策[J].动力工程学报,2012,32(2):170-176.
[11]邓迎春.超临界空冷机组给水高p H值加氧处理化学工况的控制与优化[J].热力发电,2012,41(9):100-104.
[12]李克刚.超临界直流炉给水加氧处理技术探讨[J].中国电力,2009(3):25-28.
[13]刘春红,施国忠.基建超超临界1000 MW机组精确给水加氧处理技术的研究[J].水处理技术,2013,39(6):109-111,115.
[14]潘向烽.碱化剂对核电厂二回路管道材料流动加速腐蚀的影响研究[D].上海:上海交通大学,2014.
[15]金小明.给水加氨、加氧联合处理工况(CWT)在600MW超临界燃煤机组中的应用[J].中国新技术新产品,2010(13):12-13.
[2]R B Dooley,V K Chexal.Flow-accelerated corrosion of pressure vessels in fossil plants[J].International Journal of Pressure Vessels and Piping,2000,77(2):85-90.
[3]李志刚,田泽中,黄万启,等.直接空冷300MW机组凝汽器流动加速腐蚀研究[J].热力发电,2011,40(12):34-37.
[4]C Sanama,M Sharifpur,J P Meyer.Mathematical modeling of orifice downstream flow under flow-accelerated corrosion[J].Nuclear Engineering and Design,2018,326(1):285-289.
[5]张国军.电站汽水系统流动加速腐蚀机理及对策研究[D].北京:华北电力大学,2014.
[6]Md Aminul Islam,Zoheir Farhat.Erosion-corrosion mechanism and comparison of erosion-corrosion performance of API steels[J].Wear,2017,376/377(4):533-541.
[7]John M pietralik,Chris S Schefski,et al.Flow and mass transfer in bends under flow accelerated corrosion wall thinning conditions[J].Journal of Engineering for Gas Turbines and Power,2009,133(1):493-501.
[8]Masatoshi Kondo,Takeo Muroga,Akio Sagara,et al.Flow accelerated corrosion and erosion-corrosion of RAFMsteel in liquid breeders[J].Fusion Engineering and Design,2011,86(9):2500-2503.
[9]孟龙,黄万启,孙本达,等.直接空冷凝汽器流动加速腐蚀的影响因素[J].热力发电,2014,43(12):118-122.
[10]张桂英,顾宇,邵杰.核电站汽水管道流动加速腐蚀的影响因素分析及对策[J].动力工程学报,2012,32(2):170-176.
[11]邓迎春.超临界空冷机组给水高p H值加氧处理化学工况的控制与优化[J].热力发电,2012,41(9):100-104.
[12]李克刚.超临界直流炉给水加氧处理技术探讨[J].中国电力,2009(3):25-28.
[13]刘春红,施国忠.基建超超临界1000 MW机组精确给水加氧处理技术的研究[J].水处理技术,2013,39(6):109-111,115.
[14]潘向烽.碱化剂对核电厂二回路管道材料流动加速腐蚀的影响研究[D].上海:上海交通大学,2014.
[15]金小明.给水加氨、加氧联合处理工况(CWT)在600MW超临界燃煤机组中的应用[J].中国新技术新产品,2010(13):12-13.