System and method for combined control of backwashing water pump and drum-shaped filter screen

Abstract

The invention discloses a system and method for combined control of a backwashing water pump and a drum-shaped filter screen. An outlet of a first backwashing water pump is communicated with a washing water inlet of the drum-shaped filter screen through a first backwashing pipeline, and an outlet of a second backwashing water pump is communicated with a washing water inlet of the drum-shaped filter screen through a second backwashing pipeline; a first backwashing pipeline pressure gauge is arranged on the first backwashing pipeline, a second backwashing pipeline pressure gauge is arranged on the second backwashing pipeline, and the output end of the first backwashing pipeline pressure gauge and the output end of the second backwashing pipeline pressure gauge are connected with the input end of the control system; the output end of a drum net front and back differential pressure gauge is connected with the input end of the control system, and the output end of the control system is connected with the first backwashing water pump and the second backwashing water pump, so that various problems caused by manual control of the backwashing water pumps can be avoided, and linkage between the drum-shaped filter screen and the backwashing water pumps is realized; and the pressure-bearing hidden danger of the backwashing water pipes is avoided.

Description

technical field [0001] The invention belongs to the technical field of water filtration in nuclear power plants, and relates to a combined control system and method of a backwash water pump and a drum-shaped filter screen. Background technique [0002] The function of the cooling water filtration system of the nuclear power plant is to filter and pre-treat the seawater used by the nuclear power plant. The main equipment included in it is the grill decontamination machine, the drum filter and the nuclear backwash water pump. [0003] The drum screen is designed to be installed vertically with the main shaft placed horizontally. The direction of water flow is inside and out, and the dirt is intercepted inside the drum-shaped filter screen, and the filtered seawater flows into the water user's suction port through the flow channel beside the drum screen. Each drum-shaped filter screen drives the drum-shaped screen to rotate around the main shaft through two low-speed motors (o...

AI Technical Summary

Problems solved by technology

[0007] (2) There is no linkage between the drum filter and the backwash water pump: the function of the backwash water pump is to flush the dirt intercepted inside the drum filter to ensure the normal operation of the drum filter and not to be blocked by the internal dirt

Therefore, it is inappropriate to not track the state of the drum filter in the control logic of the backwash water pump

[0008] (3) There is a hidden danger of pressure in the backwash water pipe: In the existing backwash water pump control logic, in order to ensure the backwash water pressure, when the backup backwash water pump starts, the previously started backwash water pump does not stop

Water pressure from two pumps running simultaneously can cause the backwash hose to fail

[0009] (4) The two backwash pumps cannot run at the same time: the pressure signal of the drum filter is high (generally ﹥0.3mH 2 O), the backwash control logic of the existing system does not allow the backwash water pumps to start simultaneously, and when there are many foreign substances attached to the drum filter, a backwash water pump cannot quickly and effectively remove the foreign substances

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