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Questionnaire
BrochureDilute Phase Vacuum Conveying Systems
Theory
Lean Phase Vacuum Conveying Systems (also known as Dilute Phase) generally use positive displacement (Roots type) exhausters providing up to 50% vacuum to convey materials through a pipeline to the destination where the air and product are separated at a receiving vessel with a filter, or a cyclone. Lower capacity systems are also available which use fans as the prime mover.
The product enters the convey line directly, or if metering is required, via a special feeding device such as a rotary valve or screwfeeder. The product is frequently suspended in the airflow, moving at relatively high velocities depending on the particle sizes and densities.
The conveyed product is discharged from the receiving vessel either on a continuous basis by a rotary airlock or intermittently by valves.
Applications
Lean Phase Vacuum Conveying Systems are particularly suitable for systems which convey materials at low to moderate capacities over medium distances, from multiple points to a single destination. These systems are versatile and adaptable for different materials and the low operating pressures allow lower cost pipelines and fittings. This method is frequently used for Central Vacuum Cleaning Systems and other applications, which require a reticulated network of vacuum pipes to convey product to a single collection point.
Specifications
| Convey Rates: | Low to Medium, typically <10 tonnes/hr |
| Convey Velocities: | Typically 15-30 m/s |
| Convey Distances: | Up to 100m or longer |
| Air Mover: | Positive displacement (Roots Type) Exhauster, or Fan |
| Operating Pressure: | Up to 50% Vacuum |
| Material/Air Ratios: | Low to medium, typically 3-15 kg/kg |
| Note All values approximate, refer Nu-Con for advice about how to convey your product. | |
Options
A wide variety of options for system and component design are available to suit particular system requirements, including the following:
- Weighing and dosing equipment
- Specialised feeding systems for cohesive, sticky or lumpy products, and other special properties
- Air Filtration, dehumidification and cooling systems
- Noise attenuation systems
- In-Line sifting, sampling, delumping, metal detection and magnetic separation systems
- Sanitary systems for food, dairy and pharmaceutical products
- Stainless Steel construction for sanitation or corrosion resistance
- Demountable and polished designs to USDA 3A standards for ease of cleaning
- Stepped convey lines to reduce terminal velocities, abrasion and degradation
- And more ...
