Analysis on Startup Process and Thermal Performance of Feed Water Pumps Coaxially Driven by Turbines
Aiming at the first application of feed water pumps coaxially driven by turbines in domestic power plant units,problems encountered during first start-up process of the unit were introduced in de-tail.The changes of the main parameters of the vorecon in the starting process are comprehensively ana-lyzed.Based on the operating data of the unit,the thermal performance of different feedwater pump drive schemes were calculated and analyzed.The research results indicate that:high lubricating oil pressure and unstable oil film of rotor at input end are the main cause of the accident of large shafting vibration at the input end of vorecon during impulse starting,which can be resolved by improving control logic and optimizing the startup process.During the process of lifting and lowering the load of the unit,the resi-dence time of the vorecon in the switching area should be minimized as much as possible to avoid rapid temperature rise of the anti friction bearing.The energy-saving effect of the coaxial drive feedwater pump scheme for steam turbines is significant.Under 100% THA,50% THA,and 30% THA,com-pared to the small turbine drive scheme,the coal consumption rate of the unit's power supply can be re-duced by 1.15,1.84,and 1.32 g/kWh,respectively.
coaxial drive of steam turbinefeed water pumpvoreconstartup processthermal performance
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