Product Information
The QJY automatic chemical dosing system is a packaged unit that integrates chemical dissolving, storage, metered dosing, and automatic control. As an automatic circulating water dosing machine, it adjusts the dosing rate based on online water quality data to keep parameters stable. In wastewater treatment, this dosing system is often used to feed flocculants or phosphorus removal agents to aid solid-liquid separation. The whole unit is typically skid-mounted, compact, and ready to run once water and power are connected.
Get a QuoteQJY Automatic Chemical Dosing System|Automatic Circulating Water Dosing Machine
Working Principle
The chemical is diluted with water in the dissolving tank, and the mixer ensures it dissolves fully. The metering pump receives signals from the PLC controller and injects the solution precisely into the pipeline or reaction tank. The system uses online sensors—such as pH meters, conductivity meters, chlorine analyzers, or flow meters—to collect real-time data. It compares this to the setpoint and automatically adjusts the pump stroke or frequency for closed-loop control. A level switch in the tank triggers an alarm and shutdown when the chemical runs low. The whole process runs unattended and stays continuous and stable.
Application Fields
1.Circulating cooling water: automatically dosing corrosion and scale inhibitors and biocides to prevent scaling, corrosion, and biofouling.
2.Wastewater treatment: dosing flocculants like PAC and PAM to improve settling efficiency.
3.Boiler water treatment: dosing oxygen scavengers and scale inhibitors to protect the boiler system.
4.Water reuse: dosing disinfectants or stabilizers to ensure reclaimed water quality.
FAQ
Q1: What control methods does the QJY automatic dosing system offer?
A: Common options are timer control and flow-proportional control, which dose on a set schedule or in proportion to flow. A more advanced setup is online closed-loop control, where sensors feed real-time water quality data to the PLC, which calculates and adjusts the dose automatically. Some models support remote communication and can tie into a central DCS.
Q2: What chemicals does an automatic circulating water dosing machine usually handle?
A: Mainly corrosion and scale inhibitors, biocides, and dispersants. The specific chemical and concentration depend on circulating water parameters—hardness, alkalinity, chloride levels—and the cycles of concentration. Chemicals are usually diluted and dosed continuously, or dosed in periodic shock treatments.
Q3: Can the metering pump in a dosing system hold its accuracy?
A: A standard mechanical diaphragm or plunger pump holds accuracy within about ±1% to ±2%. For extremely tight tolerances, a high-precision metering pump is available. The back-pressure valve and pulsation dampener in the system also help by reducing line pressure fluctuations, which further stabilizes dosing accuracy.