Bottom cleaning system and bottom cleaning method for inside-in and outside-out type drum-shaped filter screen

Abstract

The invention discloses a bottom cleaning system and a bottom cleaning method for an inside-in and outside-out type drum-shaped filter screen. The bottom cleaning system comprises a suction pipe row arranged in the bottom of the drum-shaped filter screen, a sewage pump arranged on a maintenance platform of the drum-shaped filter screen, an input pipeline connected between the suction pipe row and the inlet end of the sewage pump, an output pipeline connected between the outlet end of the sewage pump and a power station sewage system, and a control valve arranged on the output pipeline; and the sewage pump sucks garbage in the bottom of the drum-shaped filter screen through the suction pipe row, and the garbage is discharged to a power station sewage system through the output pipeline. According to the invention, deposited garbage at the inner bottom is cleaned under the normal running state of the drum-shaped filter screen without shutdown, so that the cost of manpower and material resources is greatly reduced, and the safety of the cleaning operation is improved; and the defect that garbage at the bottom of the inside-in and outside-out drum-shaped filter screen cannot be cleaned in time is overcome, the cleanliness of the drum-shaped filter screen is guaranteed, normal operation of the drum-shaped filter screen is guaranteed, and the safety and reliability of a cold source of a unit are maintained.

Description

technical field [0001] The invention relates to the technical field of seawater filtration in nuclear power plants, in particular to a bottom cleaning system and a bottom cleaning method for an inside-in and out-out drum-shaped filter screen. Background technique [0002] At present, domestic nuclear power plants under construction and in operation are located along the coast, and all nuclear power plants rely on seawater as a cooling source. The seawater intake of nuclear power plants is mainly to filter and clean the seawater through three barriers from the water intake to the pumping station. The first barrier is the interception net in front of the water intake, the second is the coarse grille and the fine grille (including the cleaning machine), and the third is the drum-shaped filter. The meshes of the three barriers decrease successively to realize the step-by-step filtration of seawater. Among them, the gap between the coarse grid bars is 200mm, which is mainly use...

AI Technical Summary

Problems solved by technology

[0004] The traditional drum-shaped filter device needs to rotate the clogged mesh to a high position to clear it. Even if it is rotated to a high position at high speed, it takes more than 1 minute. Once a large amount of dirt flows through the drum-shaped filter in a short period of time, it will easily cause short-term comprehensive blockage. , causing the liquid level difference on both sides of the drum filter to rise, the cooling water flow is insufficient, and the unit shuts down

At the same time, the mesh is easy to fall early in the process of carrying the dirt and rotating to a high position, so that the seawater cannot be effectively cleaned

Especially for the inside-in and out-out drum filter, the garbage with a relatively large proportion in the water flow is deposited at the bottom of the drum filter equipment, but under normal operating conditions, the drum filter is in continuous operation, long-term accumulation and sudden marine biological invasion Once the clogging rate of the drum filter screen exceeds the standard, the cooling water of the unit will be insufficient, and the power will have to be reduced, the reactor will be shut down, and even cause serious consequences such as loss of nuclear safety cooling water.

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