Research on the Problem of Large Fluctuation of Feed Water Flow in 1000MW Double Reheat Unit
In this paper,1000MW double reheat units with a single feed pump is designed to analyze the problem of large feed water flow fluctuation under medium and low load(generally within 65％load).It is pointed out that the disturbance caused by the unstable state of the two-phase flow on the boiler side of the unit under medium and low load,and the characteristic curve of the feed water pump is too flat in the medium and low load range,and the combination of the two factors causes the violent fluctuation of the feed water flow.By redeveloping the hydraulic model of the feed pump,the feed pump is modified to make the head characteristic curve steeper,which can restrain the fluctuation of the feed water flow and significantly improve the economy and safety of the low load operation of the unit.In addition,by analyzing the source and nature of the disturbance,it points out that the boiler design needs to be improved accordingly to reduce the disturbance amplitude.
double reheatsteam turbinefeed water bumpflow fluctuation
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