660MW超临界机组凝汽器真空值异常分析及处理  

Analysis of vacuum anomaly for a certain 660MW supercritical unit

作　　者：张世海 马新惠 范斌 Zhang Shihai Ma Xinhui Fan Bin(Guizhou Electric Power Research Institute , Guiyang 550002 Guizhou, China Guizhou Electric Power Vocational Technology College, Qingzheng 551417 Guizhou,china)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550002 [2]贵州电力职业技术学院,贵州清镇551417

出　　处：《贵州电力技术》2017年第6期11-13,26,共4页Guizhou Electric Power Technology

摘　　要：660 MW超临界机组正常运行时,DCS上真空值显示异常。当凝汽器压力达到一定值后,DCS上真空值显示基本保持不变,与就地真空表、排汽温度变化不一致,甚至在做真空严密性试验时,其值变化也很小。机组真空是运行中重要监视参数,真空值异常严重影响机组的安全和经济运行。根据传压管布置情况,引入理想气体状态方程,通过计算分析产生真空异常的根本原因,并提出相应的解决方法和整改措施,提高了机组运行安全性和经济性。The vacuum value displayed on the DCS is abnormal when a 660MW supercritical unit runs normally. The vacuum value displayed on the DCS almost remains constant when the condenser pressure reaches a certain value, and it~ also inconsistent with local vacuum-meter or exhaust steam temperature changes, even in the vacuum tightness test, the value of change is very small. The vacuum of the unit is an important monitoring parameter in operation, and the abnormality of vacuum value seriously affects the safety and economic operation of the unit. According to the layout of the pressure tube, the ideal gas state equation is introduced, and the primary cause of vacuum anomaly is calculated and analyzed. The corresponding solutions and rectification measures are put forward to improve the safety and economy of the unit.

关 键 词：超临界机组 凝汽器压力 传压管 真空严密性 理想气体 

分 类 号：TK26[动力工程及工程热物理—动力机械及工程]