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Where is the water from the nuclear power plant?
Release time:
2017-09-01 14:33
Source:
CNNC
A nuclear power plant is a beautiful and complex system. It is mainly divided into three circuits.
Circulating water process:
1. Sea → 2. Channel → 3. Water inlet front pool → 4. Coarse grid (with chlorination device) → 5. Gate → 6. Fine grid (with cleaning machine) → 7. Drum net → 8. Circulating water pump → 9.GD water inlet pipe gallery → 10. Debris filter → 11. Condenser → 12.GD drainage pipe gallery → 13.CC well (siphon well) → 14. Drainage culvert → 15. Sea (of which items 4-7 belong to the circulating water filtration system)
The circulating water pump is the largest pump in the nuclear power plant and has an amazing liquid conveying capacity, which can transport up to 110000 cubic meters of seawater per hour. If you convert the flow rate into a unit of seawater weight delivered per second, you may have a more intuitive feeling. Take Unit 5/6 of Fuqing Nuclear Power Plant as an example, its circulating water pump flow rate is 29.75 m3/s, which is equivalent to delivering 30.64 tons of seawater per second!
Motor of circulating water pump of Fuqing Project
The seawater circulating pump motor generally adopts vertical AC asynchronous motor, the motor adopts air water cooling, the air water cooler is installed on both sides of the motor casing, and the cooling water is provided by the regular island closed cooling water system.
Circulating water pump gearbox
Using a planetary gearbox as the deceleration mechanism, the motor transmits power and motion to the sun gear through a toothed coupling. The sun gear drives four symmetrically arranged planetary gears, and then the planetary gears drive the planet carrier during the rotation, and finally the planet carrier Drive the output shaft (low-speed end, connected to the water pump) to complete the deceleration process. The lower part of the planetary gearbox is designed with a radial thrust combination bearing, which not only bears the radial force of the gearbox and the water pump, but also bears the weight of the rotating parts of the gearbox, the weight of the water pump rotor and the axial thrust generated by the water pump. The gearbox is lubricated by a circulating water pump lubrication system (WCL).
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