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Description of control cabinet of industrial ultrapure water production equipment
It adopts 800*600*400 standard control box, and is equipped with isolating switch fuse, and circuit breaker switch. The contactor, control relay, thermal relay, circuit breaker, and fuse in the power distribution device all adopt Chint products.
Design requirements for motor control loops of industrial ultrapure water production equipment
One raw water booster pump, one reverse osmosis high-pressure pump, and one mixed-bed booster pump are required to be controlled by a soft starter. Soft start is required when starting, and soft stop is required when shutting down.
Instructions for automatic control of industrial ultrapure water production equipment
The control range of this system starts from the water out of the original water tank, becomes qualified desalinated water after system treatment, and ends when it enters the desalinated water tank. It adopts a microprocessor-based programmable controller PLC, which has the characteristics of high reliability, convenient programming, easy use, and convenient configuration with other devices. The programs and data of each production process are stored in the CPU of the PLC to run independently , The staff can monitor its operation through the computer playground as a station. Once the computer station fails, it will not affect the normal operation of the PLC. PLC has strong computing functions and can complete complex operations. It can coordinate with the operating station to run graphical configuration software to centrally monitor the operating parameters and status of the entire production process on the CRT to achieve program control and operation of the entire system And remote operation and other processes.
Control method of industrial ultrapure water production equipment
1) The entire process of system operation, withdrawal, backwashing, and commissioning, the operation mode is automatic, according to the liquid level of the desalinated water tank can be automatically shut down and commissioned
2) The entire process of operation, withdrawal, backwashing and commissioning of the system's multi-media filter is automatic. It is mainly realized according to its produced water flow or time accumulation value. The flow rate of the filter and the working status of the on-site valve are displayed on the touch screen.
3) The entire process of the operation, regeneration, and commissioning of the mixed bed of the ultrapure water system is automatic. The exit, regeneration, and operation of the mixed bed are mainly realized based on the resistivity of the produced water. The flow rate of the mixed bed and the working status of the valves on site are displayed on the touch screen.
4) Protection system of high-pressure pump: high-pressure and low-pressure protection switches are installed at the inlet and outlet of the high-pressure pump. When the water supply is insufficient and the water pressure at the high-pressure inlet is lower than a certain set value (normal pressure is 0.1Mpa), it will automatically send a signal to stop the high-pressure pump to protect the high-pressure pump from working under idling conditions. When the outlet pressure of the high-pressure pump exceeds a certain set value due to misoperation due to other reasons, the outlet high-pressure protection of the high-pressure pump will automatically cut off the power supply of the high-pressure pump, and the protection system will not run under high pressure.
5) RO (reverse osmosis) system control: the reverse osmosis device is equipped with an on-site instrument panel and an on-site operation panel, and the relevant process parameters of reverse osmosis can be read on the on-site panel, and can be started and stopped on the on-site operation panel Reverse osmosis water inlet, high pressure pump, intermediate pump, concentrated water pump and related electric valves.
6) RO start and stop protection: In order to prevent misoperation, a pressure relief device is installed at the RO product water end to automatically relieve pressure in the case of ultra-high pressure. When the RO is out of use, the electric water inlet valve is automatically closed, the RO flushing pump is started, the RO flushing electric valve, the concentrated water end electric discharge valve and the water production electric valve are opened, and the automatic flushing is about 10-50 minutes, and the standby is stopped.
7) Post-processing system: In addition to the manual regeneration of the mixed bed, the ammonia adding system and the carbon dioxide removal device are all automatically controlled. The production water flow and quality of the mixed bed are all displayed on the touch screen. When the water quality exceeds the standard, there will be an audible alarm, and the alarm record will be saved for inquiries.
