Case

Roots blowers are widely used as the core air source equipment in pneumatic conveying systems for powder and granular materials. With the advantages of stable air volume, adjustable pressure, oil-free clean air, strong adaptability and continuous operation, they have become the preferred power for closed conveying of various powders in modern industrial production.

1. Working Principle

Roots blowers provide stable positive pressure or negative pressure airflow to form a gas-solid two-phase flow in the pipeline. Under the action of airflow, powder materials are suspended and transported from the starting point to the destination, realizing closed, dust-free and efficient conveying.

2. Main Application Methods

Positive Pressure Pneumatic Conveying

The blower generates stable positive pressure to push powder forward in the pipeline.

• Suitable for long-distance, large-capacity conveying
• One sending point to multiple receiving points
• Widely used in chemical, building materials, food and other industries

Negative Pressure Pneumatic Conveying

Using Roots vacuum pumps to form negative pressure to suck materials into the pipeline.

• Suitable for multi-point feeding to one receiving point
• Clean and dust-free during feeding
• Ideal for fine powder, toxic or easily polluted materials

Mixed Pressure Conveying

Combines negative pressure suction and positive pressure discharge, with high flexibility and wide application range.

3. Typical Application Materials

• Chemical powder: calcium carbonate, talc, titanium dioxide, carbon black, starch, etc.
• Building materials: cement, fly ash, desulfurized powder, quartz powder
• Food and feed: flour, milk powder, grain, soybean meal, additives
• Environmental protection and metallurgy: dust removal ash, alumina, powder coating
• New energy materials: lithium battery powder, graphite powder, rare earth powder

4. Core Advantages

1. Fully closed conveying, no dust leakage, meeting environmental protection requirements
2. Constant air volume ensures stable conveying speed, no blockage or deposition
3. Oil-free air source avoids material contamination and ensures product purity
4. Flexible layout, can bypass equipment and adapt to complex plant environment
5. Simple structure, low failure rate, suitable for 24-hour continuous production
6. Can realize automatic control with frequency conversion to save energy

5. Application Features

• Conveying distance: horizontal up to hundreds of meters, vertical up to tens of meters
• Conveying pressure: generally 20–80 kPa for positive pressure
• Strong adaptability to materials: fine powder, ultrafine powder, high-viscosity powder, hygroscopic powder
• Can be combined with silos, mixers, packaging machines, extruders and other equipment

6. Conclusion

Roots blowers are the core power component of modern powder pneumatic conveying systems. They effectively solve the problems of dust pollution, easy moisture absorption, easy caking and difficult transportation of powder materials, and realize high-efficiency, clean, stable and automated conveying. They are widely used in various industrial fields and have become key equipment to improve production efficiency and environmental protection level.