Metering Pumps for Chemical Dosing in Paper Mill Bleaching Processes

 Metering Pumps for Chemical Dosing in Paper Mill Bleaching Processes

In modern paper production, bleaching plays a central role in achieving desired brightness and product quality. Precise chemical dosing is a critical part of this step—both underdosing and overdosing can lead to inconsistent brightness, increased chemical costs, or downstream process issues. For this reason, metering pumps have become a key component in bleaching chemical dosing systems.

Metering pumps are designed to deliver chemical solutions with high precision and repeatability. This makes them particularly suitable for applications such as bleaching, where continuous and controlled dosing of oxidizing agents like sodium hypochlorite, hydrogen peroxide, or chlorine dioxide is required.

Why Metering Pumps Are Ideal for Bleaching Chemical Dosing

1. Accurate and Adjustable Flow Control

Metering pumps can be calibrated for precise output by adjusting stroke length or frequency. This allows paper mills to maintain stable and controlled dosing, which directly supports consistent brightness outcomes and reduces chemical waste.

2. Continuous and Stable Operation

Bleaching operations typically run continuously or over extended shifts. Metering pumps are well suited for such environments, providing stable dosing over long periods with minimal fluctuation—critical for high-quality paper products.

3. Compatibility with Corrosive Chemicals

Bleaching chemicals often exhibit corrosive properties. Metering pumps built with appropriate materials and seals ensure long-term resistance to chemical attack, reducing maintenance downtime and extending service life.

4. Integration with Automation Systems

Metering pumps can be integrated into PLC or DCS control systems, enabling dynamic adjustments based on real-time process data such as flow speed, chemical concentration, and white water conditions. This promotes higher levels of process automation and operational efficiency.

Application Highlights in Paper Mill Bleaching

In a typical bleaching line, metering pumps are positioned at key chemical injection points, including:

Primary bleaching agent injection into the pulp stream

Additive dosing in blending tanks or mixers

Staged chemical dosing where multiple bleaching steps are required

Fine control adjustments to maintain desired whiteness levels

In each of these scenarios, accurate and responsive dosing helps maintain product quality while controlling chemical use.

Practical Considerations for Metering Pump Selection

Selecting the right metering pump involves assessing several operational parameters:

Chemical compatibility (materials of wetted parts)

Required dosing range and pressure

Viscosity and temperature of chemical solution

Ease of maintenance and calibration

Integration with control and safety systems

Simply choosing a pump based on flow rate and pressure tables may not yield the desired performance. A comprehensive evaluation of process requirements ensures more reliable and efficient operation.

Engineering-Oriented Solutions

Manufacturers such as Shanghai Shangcheng Pump & Valve focus on matching metering pump designs to actual process conditions encountered in paper mill bleaching lines. Rather than relying on off-the-shelf models, they analyze the specific chemical properties, dosing patterns, and control requirements before recommending a tailored solution. This engineering-driven approach reduces trial-and-error adjustments and supports long-term performance.

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