Movable drum-shaped filter screen flushing device

Abstract

The invention discloses a movable drum-shaped filter screen flushing device. The movable drum-shaped filter screen flushing device comprises two guide rails, a main pipeline and a plurality of spraying branch pipe assemblies, the two guide rails are arranged in parallel; the two ends of the main pipeline are slidably connected to the two guide rails, the main pipeline moves between a first position away from the drum-shaped filter screen and a second position located above the drum-shaped filter screen along the guide rails, and at least one end of the main pipeline is provided with a water inlet; and the spraying branch pipe assemblies are connected to the main pipeline at intervals and convexly extend towards the drum-shaped filter screen. When flushing is not needed, the main pipeline slides to be away from the drum-shaped filter screen, flushing is needed, the main pipeline slides to the position above the drum-shaped filter screen, total cross-section flushing of the drum-shaped filter screen is achieved, the back flushing efficiency of the drum-shaped filter screen is greatly improved, and compared with an existing mode that a fire gun is manually held by hand for flushing, a large amount of manpower can be saved; and personnel or foreign matters can be prevented from falling to the bottom of the drum net, the reliability of the cold source of the power plant is greatly improved, and personnel accident risks can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of cold source protection for nuclear power plants, in particular to a movable drum filter washing device for nuclear power plants. Background technique [0002] The nuclear power plant drum filter is used to filter the seawater at the water intake of the nuclear power unit. The drum filter has a rotating cylindrical skeleton, and a filter mesh is installed in the circumferential direction of the skeleton. The water flow enters the drum-shaped filter screen from both sides of the end face, and flows out of the drum-shaped filter screen after being filtered through the mesh on the filter screen (water enters the screen and water flows out of the screen). [0003] The drum-shaped filter rotates under the drive of the drive motor, and the marine organisms captured on the inside of the filter are lifted above the operating platform, and then the flushing water sprayed from the outside of the filter of the drum-s...

AI Technical Summary

Problems solved by technology

When a large number of marine organisms such as hairy shrimps and small jellyfish invade, the flushing water of the drum filter itself cannot wash away all the marine organisms attached to the inside of the filter mesh. When the filter mesh is seriously clogged, it will affect the drum filter. When the water level in the downstream of the drum screen reaches a certain water level difference between the inner and outer sides of the drum screen, it will cause the circulating water pump to trip, and even cause the machine to trip and the stack to jump, which will affect the water supply of the important plant water system that exports the heat of the nuclear island system, and seriously affect the safety of the nuclear power unit.

[0004] At present, during the cold source emergency of nuclear power plants, the filter mesh of the drum screen is mainly washed by hand-held fire guns. This washing method cannot effectively wash the entire section of the drum filter in time, and it needs Intensive manpower consumption and the risk of people or foreign objects falling downstream of the drum net

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