热电厂工业循环冷却水腐蚀在线监测系统

在热电厂工业循环冷却水系统中,凝汽器铜管腐蚀和结垢是影响发电机组损坏和效率降低的主要原因。目前普遍采用的挂片腐蚀监测法试验周期长,反映的是金属累积腐蚀,无法了解和测试循环水腐蚀状态的波动情况。因此,建立一套实时在线监测系统,在机组正常运行的状态下有效测量出凝汽     

某热电厂凝汽器铜管腐蚀原因分析

河北南网某热电厂循环冷却水系统补水为地表水,检修时发现凝汽器中Hn70-1B铜管有腐蚀泄漏现象.通过现场检查发现腐蚀呈一定的规律性,通过试验分析结合现场检查情况判断总结该厂凝汽器铜管腐蚀成因,并针对这些腐蚀成因提出改进措施,保证机组的安全稳定运行.     

氨基磺酸在热电厂凝汽器铜管化学清洗中的应用

仪化热电厂针对凝汽器铜管腐蚀结垢严重、凝汽器端差大的情况,采用腐蚀性小、安全性高的氨基磺酸进行化学清洗,同时进行硫酸亚铁一次性成膜保护,通过科学配方和严格过程控制,清洗达到了除垢完全、腐蚀量小、成膜均匀致密的效果,经济效益显著,值得借鉴。     

交流阻抗法在凝汽器黄铜管腐蚀研究中的应用

探讨交流阻抗法研究凝汽器黄铜管在循环冷却水系统中的腐蚀问题.采用热电厂实际使用的黄铜管制作管状传感器,利用交流阻抗法在同种材料三电极体系电解池中测量传感器的电化学阻抗谱,并与经典三电极体系电解池下的数值作比较.结果表明,实验室数据与现场测试数据基本吻合,交流阻抗法可以提供凝汽器黄铜管在循环冷却水系统中的年腐蚀速率和极化电阻,帮助现场工作人员及时了解凝汽器黄铜管的腐蚀状况.交流阻抗法可以有效地评定黄铜管的耐腐蚀性能,为现场腐蚀监测,进而指导生产提供了有益信息.     

火力发电厂凝汽器铜管冲刷腐蚀原因

国内某滨海火力发电厂凝汽器BFe-30-1-1铜管管口发生了大面积的冲刷腐蚀,造成凝汽器长期频繁出现泄漏事故。本工作采用自行设计的动态模拟电化学腐蚀测试试验台,对该厂所使用的铜管在电厂提供的循环水样中进行了冲刷腐蚀试验,同时做了失重试验,对采用阴极保护后铜管的腐蚀速度进行了测量。结果表明,循环水中含砂是造成管口出现大面积冲刷腐蚀的主要原因,发生冲刷腐蚀的部位主要集中在距管口0~150 mm范围内,采用阴极保护能有效降低水中带砂引起的冲刷腐蚀速度。     

国产薄壁无缝钛管的性能及在我国滨海电厂凝汽器中的应用

介绍了我国滨海电厂铜管凝汽器的水质及铜管的腐蚀情况;比较系统地报导了国产簿壁无缝钛管(φ25×0.6mm)的各项性能及该种钛管在滨海电厂作模拟试验与试用的结果。试验结果表明,用钛管凝汽器取代铜管凝汽器是非常合适的。     

电感及pH腐蚀测量系统对电厂循环水处理的作用

从电厂循环水系统腐蚀特点与机理的方面讨论了循环水系统的防腐蚀工作重点,有针对性地采用电感及pH腐蚀测量系统来指导循环水处理与设备防腐蚀。通过在天津大唐盘山发电有限责任公司(以下称大唐盘电)3号凝汽器上的应用,验证了其有效性。     

水质稳定处理技术在热电厂循环冷却水系统中的应用

本文介绍了水质稳定处理技术在大庆石化公司热电厂循环水系统中的应用。热电厂循环水系统进行水质稳定处理后，解决了水冷设备的结垢问题，大大延长了设备的检修周期。节能降耗效果显著，年节水100万吨，节煤6000吨．取得了可观的经济效益。     

凝汽器铜管的役前涡流检测

本文介绍了凝汽器铜管役前涡流检测的工艺制定原则及典型的铜管涡流检测工艺。     

火力发电厂循环水系统的腐蚀现状及防护技术

１前言 火力发电是靠燃煤（或油）释放的热能将水加热成蒸汽，以推动汽轮机作功，转化为电能，作完功后的蒸汽经凝汽器冷却后循环使用。蒸汽的冷却是由冷却水系统通过凝汽器完成的。循环冷却水有淡水和海水之分，为了节约用水，冷却水常常循环使用，含盐量逐渐增高。随着含盐量的增高，循环冷却水的腐蚀性就显得更加突出。如何保障循环冷却水系统的安全经济运行对于火力发电厂的正常生产具有重要的意义，本文介绍了以淡水为补充水的敞开式循环冷却水系统的腐蚀及防护技术。 ２循环冷却水系统的腐蚀现状 火力发电厂冷却水系统中循环水管道、…     

丁二烯装置冷凝器E-203A腐蚀原因分析

本文针对某公司丁二烯装置冷凝器E-203A的严重腐蚀情况,对冷凝器清洗使用的水质进行了分析和腐蚀性评价、对冷凝器管束外垢样进行了分析并对现场循环冷却水系统的清洗预膜效果进行了监测,根据分析和监测结果,深入地分析了冷凝器E-203A的腐蚀原因．     

Electrochemical corrosion characteristics of Ni-Resist type 2 in sea water containing ferrous sulphate

Abstract

The corrosion characteristics of Ni-Resist type 2 alloy in sea water have been determined in relation to dissolved oxygen (DO) content, pH, and concentration offerrous sulphate (injected to inhibit corrosion of copper based alloy condenser tubes). The alloy underwent uniform cathodically controlled corrosion so that relatively high pH and low DO provide an acceptable environment. Compared with similar pH conditions in the absence of added iron, Fe²⁺ dosing of aerated sea water to ≤100 ppm at pH<5 increased the corrosion rate, whereas dosing at 1000-2400 ppm (pH<5) decreased it. Addition of ferrous sulphate to deaerated sea water further suppressed the already low corrosion rates in this medium. Even under aggressive conditions of anodic polarisation, the alloy showed near uniform attack of the major constituent metals, leaving, however, a graphitised surface. The possible stagnation of a concentrated ferrous sulphate solution injected into the condenser circulating cooling water system has been considered. It is also concluded that ferrous sulphate dosing does not alter the stress corrosion cracking susceptibility of the alloy.     

徐州发电厂凝汽器的腐蚀与防护

凝汽器的腐蚀泄漏严重影响机组的水汽品质，威胁机组的安全经济运行，徐州发电厂通过及时检查和涡流探伤掌握铜管腐蚀情况。采用加强循环冷却水的加药管理，保持铜管清洁，管板刷漆联合阴极保护，FeSO4镀膜等防护措施，在凝汽器腐蚀治理方面取得一定的效果。     

淡水环境下铜凝汽器的腐蚀与防护

以内地某100MW机组为例,介绍了淡水环境下铜合金凝汽器的腐蚀情况和相应解决方法的确立、实施及注意事项.     

Discussion of paper: The peeling of the zinc layer in galvanised coatings

Abstract

Copper is basically a corrosion resistant metal in a wide variety of environments and many copper alloys are available to make possible the selection of mechanical properties and corrosion resistance appropriate to many industrial applications. Some more recent methods of enhancing the corrosion resistance of copper metals are described, including the use of corrosion inhibitors such as benzotriazole, and the protection of copper alloy condenser tubes by iron corrosion products.

Cathodic protection techniqueseither with impressed current or with the use of aluminium anodes are effective in preventing the corrosion of copper domestic water cylinders in areas having particularly aggressive water supplies. The possibilities of water treatment are also discussed.

Finally, the resistance of copper to atmospheric corrosion is described with particular reference to the development of artificial patination processes as well as the maintenance of the original surface appearance through the use of protective lacquers.     

Corrosion of Condenser Tubes Due to Carbonaceous Film on the Surface

Abstract

This paper describes pitting corrosion that has occurred in the condenser tubes in a numbu of power stations in the Republic of South Africa. The power stations concerned are situated inland and use fresh surface water, concentrated in cooling towers, for condenser cooling. Investigations indicate that the corrosion is similar to the pitting of copper potable water tubes caused in the U.K. and elsewhere by the presence of carbon film formed on the surface during tube manufacture. Many turbine and condenser tube manufacturers, however, disagree with these findings and some of their views are given in this paper. The author is of the opinion that accelerated corrosion due to this cause is more general than most corrosion engineers believe.     

循环冷却水污垢垢样中各元素含量的机理解释

垢样中铁元素含量是判定循环冷却水装置腐蚀程度的重要标志.为了满足污垢特性预测的需要,实验设计为动态封闭式循环冷却水系统模拟垢样生成,并在模拟试验期间实时取动态水样检测其中的铁离子含量、微生物数;在线监测pH、溶解氧、腐蚀速率等.在垢样的精准分析中,以JY/T 015-1996等离子体发射光谱分析方法测得的垢样中铁离子、铜离子、有机物含量.结果表明,水中铁离子高,垢样中的铁元素检出值高,表明腐蚀程度也相对高;另外,垢样中的铜离子含量高,垢样中的有机物的含量就低,二者呈负相关.     

某石化厂循环水冷凝器管束腐蚀穿孔原因与建议

通过对天津石化分公司某石化厂循环水冷凝器管束腐蚀部位检查,腐蚀部位的垢样组成,循环水中微生物分析等项目测试分析,对该厂循环水冷凝器管束腐蚀穿孔原因进行了分析,并提出了有针对性的腐蚀控制建议.     

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 通过化学、金相、扫描电镜等系统检测分析,对冷凝器铜管的腐蚀情况进行研究,结果表明：冷凝管铜管穿孔是从内壁向外壁发展并沿晶界腐蚀开裂,属于沿晶界脱锌腐蚀。对冷凝器铜管进行化学清洗和缓蚀剂预膜处理,可以提高铜管耐腐蚀性能。