Main pump electromagnetic flywheel of PWR (Pressurized Water Reactor) nuclear power station

Abstract

The invention discloses a main pump electromagnetic flywheel of a PWR (Pressurized Water Reactor) nuclear power station, aiming to provide a main pump electromagnetic flywheel of the PWR nuclear power station, substituting the coupling of an electromagnetic field for the mechanical connection between a flywheel and a main pump shafting, greatly improving the main pump running down time by separating a main pump shaft from a flywheel shaft, lowering the manufacture requirements on the main pump shafting, reducing the vibration energy of the main pump shafting, shortening the start time of a main pump and lessening the influence of the main pump start process on peripheral equipment. The main pump electromagnetic flywheel of the PWR nuclear power station comprises a mechanical flywheel, a synchronous motor, a DC start motor, a start control unit and a synchronous control unit, wherein the mechanical flywheel and the synchronous motor are mechanically connected with the rotating shaft ofthe DC start motor, the synchronous motor is connected in parallel with the main pump motor through a switch and a lead, the DC start motor is controlled by the start control unit, the electromagnetic flywheel is started by the DC motor, the synchronous motor keeps synchronous rotation, and the mechanical flywheel, the synchronous motor and the main pump motor jointly provide the main pump with running down energy. The invention is suitable for all PWR nuclear power stations.

Description

technical field [0001] The invention relates to a main pump structure of a pressurized water reactor nuclear power plant, in particular to an electromagnetic flywheel of the main pump of a pressurized water reactor nuclear power plant. Background technique [0002] In the water-cooled reactor nuclear power plant, the main pump is used to provide the reactor coolant circulation power to ensure the effective export of core heat. As a key means to alleviate the power plant's loss of external power supply accidents, the main pump is equipped with a large-mass flywheel to provide sufficient idle time for the main pump after power failure. The traditional design is to directly connect a mechanical flywheel with the main pump shaft to increase the moment of inertia of the shaft system to meet the requirements for idle time. But this also created some problems: [0003] The manufacturing requirements for the pump shaft and individual bearings have become more stringent. The main ...

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Problems solved by technology

[0009] The present invention mainly solves the limitations of the flywheel energy storage capacity caused by various reasons in the prior art, high requirements for the manufacture of the shafting of the main pump, large vibration energy of the shafting, long start-up time of the main pump, and low power when the main pump starts. For advanced technical problems, provide a voltage that can prolong the idling time of the main pump, reduce the manufacturing requirements of the main pump shaft system, reduce the vibration of the main pump shaft system, shorten the start-up time of the main pump, and reduce the influence of the main pump start-up process on the power bus voltage. Electromagnetic flywheel of main pump of water reactor nuclear power plant

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