Metering Pumps for Paper Mill Bleaching Chemical Dosing: Practical Application Insights

Metering Pumps for Paper Mill Bleaching Chemical Dosing: Practical Application Insights

In paper manufacturing, bleaching chemical dosing is a critical step that directly affects pulp brightness, product consistency, and operating cost. Whether the dosing chemical is chlorine dioxide, hydrogen peroxide, sodium hypochlorite, or other oxidizing agents, stable and accurate dosing is essential. Overdosing increases chemical consumption and may harm downstream processes, while underdosing leads to unstable brightness and quality fluctuations.

For these reasons, metering pumps are widely used in paper mill bleaching chemical dosing systems.

Why Dosing Stability Matters in Bleaching Applications

Bleaching is sensitive to dosage control. In real mill operation, common problems often originate from unstable dosing rather than the chemical itself:

Brightness varies from batch to batch

Chemical consumption increases unexpectedly

Local over-concentration causes process instability

Scale formation or line blockage occurs at dosing points

A metering pump helps transform dosing from “manual adjustment” into a controlled and repeatable process.

Key Advantages of Metering Pumps in Bleaching Chemical Dosing

1) Accurate Flow Control

Metering pumps deliver a precise and adjustable flow rate, enabling consistent dosing and better process control.

2) Compatible with Corrosive and Oxidizing Liquids

Bleaching chemicals can be corrosive and highly oxidative. Properly configured metering pumps use suitable wet-end materials and valve components to ensure long-term durability.

3) Stable Operation in Continuous Production

Paper mills typically run continuously. Metering pumps support stable, uninterrupted dosing, improving overall production consistency.

4) Easy Integration with Control Systems

Metering pumps can be integrated with flow meters, PLC systems, or dosing controllers for proportional dosing and automated operation.

Practical Selection Considerations

To ensure reliable performance in paper mill bleaching applications, engineers typically evaluate:

Chemical type, concentration, and temperature

Required dosing flow range and discharge pressure

Wet-end material compatibility (pump head, seals, valves)

Need for accessories such as back-pressure valves, pulsation dampeners, or injection quills

Mixing conditions and dosing point location to avoid poor dilution and scaling

Selection based only on flow rate and pressure can lead to dosing instability or maintenance issues over time. An application-focused configuration is often the most effective approach.

Application-Oriented Engineering Support

Manufacturers such as Shanghai Shangcheng Pump & Valve focus on matching metering pump configurations to real paper mill operating conditions, including chemical properties, dosing pressure, and long-term reliability requirements. This helps reduce downtime, improve dosing accuracy, and control chemical consumption.

Learn more about metering pump solutions here:

👉 https://www.scpv.cn/jiliangbeng/