Safe variable-frequency power supply system for nuclear power unit

Abstract

The invention discloses a safe frequency conversion power supply system for nuclear power units, which includes a feedwater pump steam turbine, a first gear box, a second gear box, a feedwater pump, a generator, a changeover switch, a frequency conversion busbar and a power frequency busbar; wherein, the The main shaft of the feedwater pump steam turbine is connected to one end of the drive shaft of the feedwater pump through the first gear box, and the other end of the drive shaft of the feedwater pump is connected to the drive shaft of the generator through the second gear box connected, the output end of the generator is respectively connected to the variable frequency bus and the power frequency bus through the transfer switch; the air inlet of the feed pump steam turbine is connected to the steam of the nuclear power unit through the main steam pipeline of the nuclear power unit generator. The invention utilizes the waste heat of the reactor core to heat the feed water, can fully export the waste heat of the reactor core, ensures the safety of the reactor, and can also provide emergency power supply for nuclear power units.

Description

technical field [0001] The invention relates to a safe power supply system, in particular to a safe variable frequency power supply system for nuclear power units. Background technique [0002] In the process of nuclear power production and operation, the unit usually needs a large number of auxiliary machines to maintain the basic steam-water power cycle of the primary and secondary circuits of nuclear power, including main pumps, condensate pumps, main feed water pumps, etc. The power supply of these auxiliary machines generally comes from the plant power, and the plant power of the nuclear power unit is mostly supplied by the generator of the unit; when the generator of the unit is out of operation, the plant power is supplied by the ultra-high voltage grid through the main transformer step-down . [0003] The power consumption rate of pressurized water reactor nuclear power plants is generally about 6.5%, which is lower than that of thermal power units with the same cap...

AI Technical Summary

Problems solved by technology

[0005] Since it takes a certain amount of time for the diesel generator to start to run with full load, the waste heat of the core will continue to accumulate before the auxiliary machines of the primary and secondary circuits resume power supply. If the waste heat cannot be exported in time, the core will melt risk, will create a major safety hazard

If the emergency diesel generator fails and the power supply of the nuclear power unit cannot be restored within a short period of time, a serious safety accident will occur

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