Analysis and Countermeasures of Overhauls of Turbine in Trough Photothermal Power Station
The typical problems encountered in the first overhaul of the steam turbine of CGN Delingha 50 MW trough photothermal Demonstration Power Station are analyzed in this paper,such as excessive measurement errors in the center finding of the dual-axis rotor,water erosion of the turbine′s high and low pressure cylinder end-stage dynamic and static blades,and frequent leakage of the elbows of the steam and water drainage pipelines,etc.The reason for the exceeding measurement errors in the center finding of the dual axis system rotor is determined to be the measurement error caused by the sinking of the high-speed shaft of the reducer due to self weight traction.The serious water erosion of the dynamic and static blades at the end stage of the turbine high and low pressure cylinders is caused by steam with water in the exhaust steam of the high pressure cylinder of the high pressure and medium temperature unit,and the long time operation of the unit with low load and low backpressure leads to the increase of the humidity of the steam at the end stage of the high and low pressure cylinders and aggravates the effect of water erosion.The frequent leakage of steam and water drainage pipeline elbows was caused by frequent use of unit drainage,increased steam humidity,incomplete blowing during installation,and impurities such as welding slag,which prevent the floating steam trap from forming condensate.The steam and drainage pipeline elbows are subjected to erosion for a long time by the steam and watermixture,resulting in the thinning and leakage of the pipe wall at the elbow.After treatment,the above problems are solved.
trough photothermal power stationsteam turbinedual-axis rotorend stage bladedrainage pipeline
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