Purified water is prepared to meet quality standards and transferred to the storage tank. It is then pumped to various usage points and recirculated back to the tank. During operation, the water quality and process are automatically controlled through elements such as level, temperature, conductivity, and flow rate.
The system includes pure water storage tanks, sanitary centrifugal pumps, sanitary heat exchangers, diaphragm valves, respirators, on-site display control systems, and various instruments.
1) Pure water is produced by the preparation equipment and then circulated through the pipeline system to the pure water buffer tank.
2) Pure water storage and recirculation temperatures are at room temperature.
3) The purified water recirculation system is equipped with a variable-frequency controlled recirculation sanitizing pump. It adjusts the pump's output based on the flow meter signal before returning to the tank, ensuring the pipeline flow rate meets the requirements.
4) The purified water conductivity is tested using an online conductivity meter before recharging the tank. If the conductivity value exceeds the required level, the meter sends a signal to the PLC, which then triggers an alarm signal. Simultaneously, the PLC controls the opening of an online pneumatic diaphragm valve to discharge the substandard water. If the conductivity value remains above the required level for a continuous period, the system automatically shuts down and emits an alarm signal to prompt the operator to inspect the equipment.
5) Install a temperature gauge and temperature sensor on the pipeline before the heat exchanger for temperature control during pasteurization.
6) The purified water storage tank is equipped with a level gauge and set with the maximum and minimum level parameters. When the level exceeds the maximum value, the inlet valve at the tank top closes. When the level is below the minimum value, the conveying pump shuts off.
7) Control the variable-frequency pump via an online flow meter installed before the return tank to ensure the flow rate of pure water within the pipeline is not less than the minimum flow rate of 1m/s.
8) During the sterilization process, the system records the temperature, pressure, flow rate, and electrical conductivity inside the pipelines and tanks.
9) The system features an electrical control system (1 set of PLC), with the control panel directly mounted inside a stainless steel control cabinet on the storage and distribution system支架. The cabinet houses electrical equipment, PLC & OIT. This control system facilitates the operator's operation, monitoring, and control of the equipment. The Operator Interface Terminal (OIT) is a monitoring panel that displays operational parameters of the equipment. Alarms, actions, sterilization steps, process setpoints, and process values are all displayed on the OIT.
