Open AccessAnalysis and treatment of abnormal shutdown of 150MW unit due to low feed water flow
Author(s) -
Wanjun Li,
Xiaoxia Li,
Yuan Chen,
Chong Li
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/612/4/042022
Subject(s) - drum , shutdown , boiler (water heating) , water flow , environmental science , boiler feedwater , nuclear engineering , power unit , check valve , high pressure , marine engineering , waste management , materials science , engineering , mechanical engineering , power (physics) , environmental engineering , engineering physics , physics , quantum mechanics
The water level of NO.2 high pressure heater rised when the 150MW turbogenerator set of a power plant operated normally, it was unassembled and checked. After the high pressure heater was put into operation, the water level of the boiler drum droped. After the standby electric pump was started and the electric load was reduced, the water level of the boiler drum still droped, resulting in the boiler feed water flow reduced to the protection action and the unit shutdown. Through inspection, it was found that the connecting rod pin of the manual valve at the outlet of the high-pressure heater was broken, which maked the manual valve at the outlet not fully open and lead to low water flow rate at the water side of the high-pressure heater.After the corresponding improvement and optimization measures were taken, the unit can be restarted and run normally .