Influence of cylinder sagging to the adjustment of steam seal clearances and its countermeasures

Abstract

Abstract:

Abstract:In order to solve the high thermal loss problem of steam turbine for Jiangsu Huadian Yangzhou Power Generation Company Limited, the steam seal clearances of high and middle pressure cylinder body parts are readjusted.This paper analyzed the forming reasons of cylinder sagging and its influence to the adjustment of steam seal clearances.After remeasuring the values of sagging,the adjustment values of steam seal clearances of high/medium pressure cylinder are confirmed. At last,this paper proposed an adjustment method for the upper part of the steam seal clearance under the half casing condition.After the adjustment,the thermal loss of unit reduced to 7899kJ/(kW·h).

Key words: Keywords:steam turbine, steam seal, clearance, fully installed cylinder, semi installed cylinder, bore center, sagging

SHI Zhengsheng,TONG Xi,OU Suoshi,JI Jianyu,YIN Guang. Influence of cylinder sagging to the adjustment of steam seal clearances and its countermeasures[J]. Huadian Technology, 2016, 38(3): 26-28.

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Influence of cylinder sagging to the adjustment of steam seal clearances and its countermeasures

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