【作者】 徐锐；

【导师】 罗运柏；

【作者基本信息】 武汉大学 ， 应用化学， 2004， 硕士

【摘要】 本论文简单介绍了我国典型大型发电机内冷水系统的基本结构，阐述当前我国大型发电机内冷水系统的运行现状及存在问题，介绍了几种常用的内冷水水质调节方式，分析了这些调节方式的特点及局限性，列举出几种有关发电机内冷水的水质要求和控制指标。结合发电机铜线棒的材质性能和内冷水的水质特性，通过对铜腐蚀机理的理论分析，讨论了大型发电机铜线棒的腐蚀控制原理。通过不同水质条件下铜试片的静态腐蚀试验，即铜腐蚀指示片在不同的pH值、不同的pH值调节液、初始铜离子不同浓度、是否除氧、是否脱除二氧化碳等条件下的腐蚀速率进行测试，分析讨论了不同水质条件对铜腐蚀的影响。 根据大型发电机铜线棒的腐蚀控制原理，借鉴国内外大型发电机内冷水系统设计运行经验，开发了发电机内冷水微碱性循环处理技术。发电机内冷水微碱性循环水处理技术原理就是采用离子交换方式对部分内冷水进行连续处理，以调节发电机内冷水水质，使水质达到高pH值、低电导率、低含铜量、杂质含量少的要求。它同传统内冷水处理方式的区别在于：不添加任何药剂，通过离子交换处理使得内冷水中含有微量的NaOH，水质的高pH值使铜处于自钝化状态，减少铜线棒腐蚀。 为将微碱性循环处理技术进行工业应用，根据微碱性循环处理原理设计了现场动态模拟试验装置，在江西九江发电厂两台125MW机组和两台200MW机组内冷水旁路上进行了动态模拟试验。通过模拟试验确定了微碱性循环处理的最佳离子交换树脂的选型配比，并进行了最佳运行周期试验。根据微碱性循环处理动态模拟试验结果，结合江西新余发电有限责任公司2号200MW发电机内冷水系统实际情况，提出了工业应用性试验方案，对该系统进行微碱性循环处理改造，工业试验取得了圆满成功。经过不断的改进与完善，截至目前为止，发电机内冷水微碱性循环处理技术已在7台300MW发电机、4台200MW发电机和1台125MW发电机上得到推广应用。更多还原

【Abstract】 The paper introduced the typical structure of internal cooling water system of large generators, illuminated the running actuallity and problems of these cooling water system. Some methods to inprove the quality of the cooling water are introduced, the speciality and technical limitations of these means are discussed, some kinds of requirements of internal cooling water quality were enuminated too. According to the material of large generator’s stator bar and the speciality of internal cooling water, we analysised the mechanism of corrosion of copper, discussed the principle to alleviate the erosion of large generator’s stator copper bar. According to the results of some static corrosion experiments of copper in different kinds of water, the corrosion information of copper under different situations was understood.According to the principle to alleviate the erosion of large generator’s stator copper bar, referenced the design principle of the internal cooling water system of generators manufactured by different corporations in the world, we developed the technology of low-alklinous recycling treatment of internal cooling water for large generator. A little of cooling water is purified through an special equipment, the quality of the whole water in the system is improved through the method, it can meet the require of some regulations, such as higher value of pH, lower conductivity, few of impurity, this is the principle of the technology of low-alklinous recycling treatment. The key difference between the technology with other methods is without adding any chemical reagent, without supplying or changing water, and very little NaOH contained in the water by ion-exchange, its quality is much better than the requirement in DL801-2002, Under these water quality conditions, copper is in the state of self- passivity. Thus, the copper bar is protected well.In order to put the technology into practice, we designed a local dynamic simulative tester, and processed the dynamic simulative experiments through the bypass of the internal cooling water system in 125MW and 200MW generators, the types of ion-exchange resin were selected through these experiments. Associated with the actuality of the internal cooling water system of Xinyu power plant unit 2 generator, we reconstructed the system and made test in the 200MW generator, the result of this test is very satisfied. With continuous perfection of the technology, the technology of low-alklinous recycling treatment of internal cooling water for large generator has been successfully applied in seven 300MW, four 200MW and one 125MW generators.更多还原