共查询到20条相似文献,搜索用时 406 毫秒
1.
通过发电机组定子线棒堵塞的实例分析,探讨了水内冷发电机线棒阻塞的原因,指出系统腐蚀形成疏松形态的氧化产物是主要原因,通过碱化运行提高pH值,抑制系统腐蚀,解决了线棒堵塞的问题。 相似文献
2.
通过对南热2×600 MW机组锅炉水冷壁的高温腐蚀、空预器的低温腐蚀及积灰堵塞和脱硫系统的情况分析,对锅炉高温腐蚀和低温腐蚀机理进行了阐述,论述了燃用高硫煤对机组运行带来的危害及应对措施。 相似文献
3.
4.
5.
6.
7.
为保证脱硫系统高效、稳定、经济运行,通过分析旁路挡板设计问题;脱硫效率的影响因素;增压风机和循环泵的运行方式以及脱硫系统堵塞、结垢、腐蚀、磨损的原因,进行了一系列试验后提出了优化措施。优化后脱硫效率长期维持在92%以上,脱硫电耗大幅降低,除雾器及GGH堵塞问题以及脱硫设备的腐蚀、磨损问题得到了有效地控制。 相似文献
8.
回转式空气预热器传热元件的防腐 总被引:1,自引:0,他引:1
回转式空气预热器位于锅炉尾部,因而会产生一定的腐蚀,燃用高硫煤时较为严重,受腐蚀对受热元件影响很大,在一定条件下,传热元件发生结露腐蚀,而不断粘结飞灰堵塞通道,严重地影响空气预热器的正常使用。文章阐述了产生腐蚀的机理和防止措施。 相似文献
9.
华能汕头电厂锅炉再热器发生短期过热爆管。经理化检验和分析,管子过热的原因锭行超温而是管内堵塞了大量粉未状FeO(约2kg)。FeO堵塞管子的主要原因是锅炉在安装调试阶段从水压试验到酸洗停了近一年,现场保养措施不足,腐蚀产生较多,加上酸洗和吹管动力不匀,将腐蚀产物带到再热器底部U型弯内积聚所致。 相似文献
10.
11.
12.
13.
14.
发电机内冷却水(内冷水)系统腐蚀及腐蚀产物沉积所引起的绝缘性能与通流冷却能力下降,是发电机运行的重要安全隐患。某发电厂发电机内冷水系统出现堵塞、超温异常,其腐蚀产物中单质铜含量高。为消除隐患,首次采用以氨基磺酸为主的复合酸并添加双氧水作为清洗介质,辅以分步去除氧化铜和单质铜的工艺,对该发电机内冷水系统实施了化学清洗。结果表明,所采用的清洗工艺技术有效去除了线棒内的腐蚀产物,且对线棒本体损伤较小;与清洗前相比,清洗后定子线棒最高温度下降了9.9 ℃,线棒间最大温差下降了10 ℃,不同线棒间出水最大温差下降了11 ℃,确保了发电机安全经济运行。 相似文献
15.
16.
17.
阐述了火力发电厂锅炉水冷壁管高温腐蚀和磨损的机理,总结了防止水冷壁高温腐蚀和磨损的方法。得出积极采用热喷涂技术是火电厂锅炉水冷壁高温防腐耐磨最可靠的解决方法的结论。 相似文献
18.
阐述了火力发电厂锅炉省煤器、水冷壁、过热器和再热器泄漏的原因,提出了相应的防范措施,有利于解决其磨损、腐蚀和超温问题,减少了锅炉临时检修次数,延长了锅炉的使用寿命,提高了锅炉的安全性和经济性. 相似文献
19.
A. S. Kurskii 《Thermal Engineering》2014,61(1):54-60
A newly developed procedure for predicting the growth of deposits on the fuel rods of a water-cooled water-moderated reactor under coolant boiling conditions is described. The results obtained from an experimental validation of the procedure carried out for fuel assemblies at different stages of their operation in a vessel-type boiling-water reactor are presented. It is shown on the basis of experimental data that the deposits forming on the fuel rods in a boiling-water reactor consist mainly of copper and iron. Copper exists in dissolved form and precipitates in pores between the particles of iron compounds, and the thickness of deposits is determined by the particles of iron corrosion products themselves. The corrosion products incipience and growth processes were investigated, and the effect of deposit formation from fine iron particles on fuel rod claddings operating under coolant boiling conditions was predicted theoretically and revealed experimentally. Relatively large particles moving along a fuel rod cannot penetrate into the laminar sublayer due to the effect of Magnus force on them. Based on the results of theoretical and experimental investigations, recommendations on decreasing the content of iron corrosion product particles in transient operating modes of boiling water reactors are worked out. The method of very fast decrease of pressure at low levels of reactor power worked out on a VK-50 reactor makes it possible to remove relatively large particles of shutdown corrosion products to the coolant purification system while keeping them from depositing on the fuel rods. With the use of this routine operation, matters concerned with radiation safety and durability of fuel assemblies in boiling light-water reactors are solved in a more efficient manner. 相似文献
20.
Zhigang Song Soh Ping Neo Chong Khiam Oh Redkar S. Yuan-Ping Lee 《Device and Materials Reliability, IEEE Transactions on》2005,5(2):206-211
As semiconductor device features shrink into deep-submicron regime, copper metallization is taking the place of aluminum (Al)-tungsten (W) metallization because of the higher electrical conductivity and electromigration resistance of copper. However, it is very difficult for copper to be etched by dry etching method, thus copper metallization is created with damascene process. In this process, chemical mechanical polishing (CMP) is the key step. The wet chemical treatment in CMP makes copper corrosion to be one of the critical issues for copper metallization. This paper has addressed the three different types of copper corrosion, namely copper chemical corrosion, copper galvanic corrosion and photo assistant copper corrosion. The failure analyses for how to differentiate them and identify their root causes have been also discussed in details. 相似文献