600MW机组凝结水含氧量超标的危害和预防.pptxVIP

600MW机组凝结水含氧量超标的危害和预防;１;凝结水溶解氧存在的原因：;针对上述原因，从以下方面进行防范和处理：;运行中真空系统的查漏以氦介质检漏为主。方法是在运行真空泵出口布置氦介质检漏装置，利用专用的喷枪在所有负压系统的阀门、法兰、管道焊缝、排大气口等处喷氦气，然后观察1-2分钟，如果检测点有泄露，检漏装置就会发出报警，泄漏量越大，报警数值就越大，即使很微量的泄露，也能检测出来。并且这种方法灵活，不受时间限制，消除漏点后随时可以检测溶解氧的变化。缺点是工作量大，耗时长。;1.vacuum system leak;灌水查漏。方法是：凝结器灌水至末级叶片下100mm高度，然后查漏处理。需要注意的是灌水过程中有专人监视水位，防止水位过高进入汽轮机。但这种方法必须停机后才能进行。; Condenser irrigation to the last stage blades under 100mm height , then leak to handle . Should be noted that there is someone to monitor the water level,in order to prevent the high water level enter the turbine in the irrigation process . However , this method must be shut down after .; 2.凝结水泵系统的改造;3.对加入凝结水的回收水进行处理;3 . Join condensate recycled water treatment;4．凝补水系统的改造;4. Condensate replenishment system transformation;案例分析:;Case Study:;Another investigation found : vacuum system leakage points are more concentrated in the condenser pipe valve and condensate pump inlet pipe valve etc. , reason of air leakage cause to increase oxygen content of condensate .