基于恒电位法的阀冷却系统铝散热器腐蚀特性研究
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摘要
目前高压直流输电阀冷却系统普遍存在均压电极结垢问题,严重的甚至影响高压直流系统的正常运行。从均压电极结垢的源头即散热器的腐蚀出发,以安顺换流站的换流阀的内冷水系统为对象,基于电化学原理、恒电位法和测试技术,分析铝散热器的腐蚀机理,从温度、悬浮树脂浓度、水流速、溶解氧浓度和PH值5个方面讨论铝散热器腐蚀的影响因素和作用机制,得出了抑制铝散热器腐蚀的各因素最佳值,并建设性地提出了改善阀冷系统限制其腐蚀结垢的方法,为解决南方电网其他换流站内冷却水系统的腐蚀结垢提供科学依据。
At present,the problem of grading electrode scaling is common in the cooling system of HVDC converter valve,which seriously affects the normal operation of HVDC system. Based on the internal cooling water system of the converter valve of the Anshun converter station,the corrosion of the aluminum radiator which is the source of grading electrode scaling is analyzed by the electrochemical principle,the constant potential method and the testing technique. The influence factors and mechanism of corrosion of aluminum radiator are discussed from five aspects:temperature,suspension resin concentration,water flow rate,dissolved oxygen concentration and pH value. The optimum values of the factors that inhibit the corrosion of aluminum radiator are obtained. And the method of improving the corrosion and scaling of the valve cooling system is put forward constructively,in order to provide a scientific basis for solving corrosion and scaling of the other converter station cooling water system of China southern power grid.
At present,the problem of grading electrode scaling is common in the cooling system of HVDC converter valve,which seriously affects the normal operation of HVDC system. Based on the internal cooling water system of the converter valve of the Anshun converter station,the corrosion of the aluminum radiator which is the source of grading electrode scaling is analyzed by the electrochemical principle,the constant potential method and the testing technique. The influence factors and mechanism of corrosion of aluminum radiator are discussed from five aspects:temperature,suspension resin concentration,water flow rate,dissolved oxygen concentration and pH value. The optimum values of the factors that inhibit the corrosion of aluminum radiator are obtained. And the method of improving the corrosion and scaling of the valve cooling system is put forward constructively,in order to provide a scientific basis for solving corrosion and scaling of the other converter station cooling water system of China southern power grid.
引文
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[21]WEBER I,MALLICK B,SCHILD M,et al.Behavior of highly diluted electrolytes in strong electric fields-prevention of alumina deposition on grading electrodes in HVDC transmission modules by CO2-induced p H-control[J].ChemistryA European Joournal,2014,20(38):12091-12103.
[22]葛东阳.换流阀冷却系统腐蚀与沉积分析模型与影响因素研究[D].北京:华北电力大学,2016.GE Dongyang.Research on electrochemical corrosion and deposition analysis model and influencing factors of converter valve cooling systems[D].Beijing:North China Electric Power University,2016.
[2]田兴旺,邓本飞.兴安直流阀冷系统主过滤器堵塞原因分析及改进建议[J].高压电器,2010,46(10):45-48.TIAN Xingwang,DENG Benfei.Filter blocking analysis and improvements of valve cooling system of Xing’an HVDCproject[J].High Voltage Apparatus,2010,46(10):45-48.
[3]张培东,郝志杰,刘红太.贵广HVDC阀冷均压电极改造原理与实施[J].电工技术,2008(12):1-2.ZHANG Peidong,HAO Zhijie,LIU Hongtai.Principle and implement of improving Guiguang HVDC valve cold voltage sharing pole[J].Electric Engineering,2008(12):1-2.
[4]段涛,杨斌,李贤庆,等.±500 k V换流站阀水冷系统隐患分析治理[J].电力系统保护与控制,2014,42(18):132-138.DUAN Tao,YANG Bin,LI Xianqing,et al.Analysis of potential dangers in±500 kV converter station valve water cooling system[J].Power System Protection and Control,2014,42(18):132-138.
[5]邓本飞,孙恒明,曹继丰.高压直流阀冷系统的除垢工艺[J].南方电网技术,2008,2(3):73-76.DENG Benfei,SUN Hengming,CAO Jifeng.The scale removal techniques of HVDC valve cooling system[J].Southern Power System Technology,2008,2(3):73-76.
[6]赵文亮.高压直流输电换流阀晶闸管铝散热器腐蚀问题研究[J].清洗世界,2015,31(12):1-3.ZHAO Wenliang.Researching of converter valve thyristor aluminum heat sink corrosion problem of HVDC[J].Cleaning World,2015,31(12):1-3.
[7]蔡超.纯铝在中性NaCl溶液中的腐蚀研究[D].银川:宁夏大学,2005.CAI Chao.Corrosion studies on pure aluminum in aqueous neutral sodium chloride solutions[D].Yinchuan:Ningxia University,2015.
[8]程鹏,王江顺,陶利佳,等.中性水介质中铝的腐蚀行为[J].腐蚀与防护,2012,33(6):507-509.CHENG Peng,WANG Jiangshun,TAO Lijia,et al.Corrosion behavior of aluminum in neutral water medium[J].Corrosion and Protection,2012,33(6):507-509.
[9]杨振海,徐宁,邱竹贤.铝的电位-pH图及铝腐蚀曲线的测定[J].东北大学学报,2000,21(4):401-403.YANG Zhenhai,XU Ning,QIU Zhuxian.Measurement of Aluminum corrosive potential-pH and the polarization curve[J].Journal of Northeastern University,2000,21(4):401-403.
[10]刘叡,程从前,李会芳,等.2205双相钢临界点蚀温度测量方法的比较[J].腐蚀与防护,2016,37(5):419-423.LIU Rui,CHENG Congqian,LI Huifang,et al.Comparison of measuring methods for CPT of DSS 2205[J].Corrosion and Protection,2016,37(5):419-423.
[11]王华.聚吡咯涂层的制备及耐腐蚀性能研究[J].表面技术,2015,44(3):111-115.WANG Hua.Preparation and corrosion performance of polypyrrole film[J].Surface Technology,2015,44(3):111-115.
[12]覃奇贤,刘淑兰.电极的极化和极化曲线(Ⅰ)--电极的极化[J].电镀与精饰,2008,30(6):28-30.QIN Qixian,LIU Shulan.Polarization of electrode and polarization curve(Ⅰ)-polarization of electrode[J].Plating&Finishing,2008,30(6):28-30.
[13]覃奇贤,刘淑兰.电极的极化和极化曲线(Ⅱ)--极化曲线[J].电镀与精饰,2008,30(7):29-34.QIN Qixian,LIU Shulan.Polarization of electrode and polarization curve(Ⅱ)-polarization curve[J].Plating&Finishing,2008,30(7):29-34.
[14]王威,任呈强,曾德智,等.316L不锈钢在溶有不同气体NaCl溶液中的点蚀敏感性[J].机械工程材料,2015,39(7):95-98.WANG Wei,REN Chengqiang,ZENG Dezhi,et al.Pitting susceptibility of 316L stainless steel in NaCl solution with different dissolved gases[J].Materials for Mechanical Engineering,2015,39(7):95-98.
[15]王圣平.实验电化学[M].武汉:中国地质大学出版社,2010.WANG Shengping.Experimental electrochemistry[M].Wuhan:China University of Geosciences Press,2010.
[16]庄继华.物理化学实验[M].北京:高等教育出版社,2004.ZHUANG Jihua.Physical chemistry experiments[M].Beijing:Higher Education Press,2004.
[17]白新德.材料腐蚀与控制[M].北京:清华大学出版社,2005.Baixinde.Corrosion and control of materials[M].Beijing:Tsinghua University Press,2005.
[18]NOROUZI S,HAZERI K,MIROSLAW L.Investigation on the effects of temperature,dissolved oxygen and water on corrosion behaviour of aluminium and copper exposed to diesel-type liquid fuels[J].Fuel Processing Technology,2014(128):220-231.
[19]PARK I J,YOO Y H,KIM J G,et al.Corrosion characteristics of aluminum alloy in bio-ethanol blended gasoline fuel:Part 2.The effects of dissolved oxygen in the fuel[J].Fuel,2011,90(2):633-639.
[20]葛科.盐酸介质中铝的腐蚀与防护研究[D].重庆:重庆大学,2007.GE Ke.Corrosion and protection of aluminum in the hydrochloric acid[D].Chongqing:Chongqing University,2007.
[21]WEBER I,MALLICK B,SCHILD M,et al.Behavior of highly diluted electrolytes in strong electric fields-prevention of alumina deposition on grading electrodes in HVDC transmission modules by CO2-induced p H-control[J].ChemistryA European Joournal,2014,20(38):12091-12103.
[22]葛东阳.换流阀冷却系统腐蚀与沉积分析模型与影响因素研究[D].北京:华北电力大学,2016.GE Dongyang.Research on electrochemical corrosion and deposition analysis model and influencing factors of converter valve cooling systems[D].Beijing:North China Electric Power University,2016.