Optimization of Cold Quick Start for M701F4 Improved Gas-steam Combined Cycle Medium and Low Pressure Combined Cylinder Unit
In order to solve the problem of an extended cold start time of about 12 hours for the medium and low pressure combined cylinder unit in the M701F4 improved gas-steam combined cycle,this type of unit was analyzed by analyzing the cold warm-up,startup process,unit vibration,high pressure cylinder expansion,and differential expansion of the high pressure cylinder before startup.The unit maintenance opportunity was also used to clean the shaft seal and residual deformation of the high pressure cylinder,and some innovative solutions were adopted to connect steam from the high parameter drainage pipeline of the adjacent machine as a cold state heating source,improve the heating parameters,and combine with the starting method of the near intermediate pressure cylinder.After the turbine was driven to full speed and connected to the grid as soon as possible,it is beneficial for the high pressure cylinder to enter more steam and warm up the cylinder with load.During the startup process,methods such as predicting the expansion difference of the high pressure cylinder and controlling the load heating speed can shorten the cold start time of the unit to about 3 hours,greatly reducing the cold start time of the same type of gas turbine combined cycle power generation unit has reference significance for the optimization design or technical transformation of medium and low pressure combined cylinder units.
medium and low pressure combined cylinderpredict the expansion difference of the high pressure cylinderpreheatquick startvibration
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维普
