摘要
对某电厂4号600MW机组凝汽器端差高于3号机组进行了分析。结果表明,其主要原因是真空泵4A出力下降和闭式循环冷却水(闭冷水)温度偏高。真空泵4A叶轮汽蚀严重,部分叶片穿孔以及由汽蚀产生的铁屑积聚在真空泵板式冷却器表面,使其出力下降。将真空泵4A的叶轮及转子的材质由铸铁更换为不锈钢,在该机组的开式循环冷却水(开冷水)回路中加装1台开冷泵,并定期起动开冷泵对闭冷器进行反冲洗后,4号机组凝汽器端差较之前相同工况下降约1.5℃。
Output decrease of NO.4 A vacuum pump and temperature increase of the close-cycle cooling water are considered as the main reasons for problem takes place in a 600 MW level power plant which leads to the terminal temperature difference of condenser on NO.4 unit higher than that on NO.3.Serious cavitation occurs on impeller of NO.4 vacuum,and some blades perforate,moreover,iron filings caused by cavitation accumulate on the surface of plate cooler in vacuum pump.All these cause decrease of the pump output.Measurements such as changing the material of impeller and rotor on NO.4 A vacuum pump into stainless steel,installing an additional open-cycle cooling pump in the open-cycle cooling water loop of this unit,and starting the open-cycle cooling pump regularly to backwash the close-cycle cooler,can make the terminal temperature deviation drop by about 1.5 ℃,compared with that under the same condition.
出处
《热力发电》
CAS
北大核心
2012年第12期101-103,共3页
Thermal Power Generation
关键词
600
MW机组
凝汽器
端差
真空泵
闭冷水
开冷泵
600 MW unit
condenser
terminal temperature deviation
vacuum pump
close-cycle cooling water
open-cycle cooling pump
