Pneumatic Conveying Systems

Transport Powders & Granules from one point to another quickly and efficiently

Pneumatic conveying systems use pipes or ducts called transportation lines to carry a mixture of materials and a stream of air.

Materials most suitable for pneumatic conveying systems are dry pulverized or free flowing or light powdery like cement, fly ash etc.

These materials are transported by means of a stream of high velocity air through the pipes or ducts.

The products are moved through various tubes via air pressure, allowing for extra vertical versatility. Pneumatic conveyors are either carrier systems or dilute-phase systems; carrier systems simply push items from one entry point to one exit point, such as the money-exchanging pneumatic tubes used at a bank drive-through window. Dilute-phase systems use push-pull pressure to guide materials through various entry and/or exit points.

Note that air compressors, vacuums, or blowers can all be used to generate air-flow. Deciding on which method of air-flow generation will depend on researching which method will be the most efficient and economical way of transporting your specific product.

Three basic systems that are used to generate high-velocity air stream:

  1. Suction or vacuum systems, utilizing a vacuum created in the pipeline to draw the material with the surrounding air.The system operated at a low pressure, which is practically 0.4–0.5 atm below atmosphere, and is utilized mainly in conveying light free flowing materials.
  2. Pressure-type systems, in which a positive pressure is used to push material from one point to the next. The system is ideal for conveying material from one loading point to a number of unloading points. It operates at a pressure of 6 atm (standard atmosphere) and upwards.
  3. Combination systems, in which a suction system is used to convey material from a number of loading points and a pressure system is employed to deliver it to a number of unloading points.
Although there are dozens of different pneumatic conveying configurations, the systems can be divided into two types:

1. Dilute Phase
2. Dense Phase

The basis of Dilute Phase Conveying is that the material is carried in a Continuous Stream of Air. The air has relatively high velocity and low pressure. This method is suitable for materials with low bulk density.
Dilute Phase Systems can be further divided into 2 main types:

1. Dilute Phase Pressure
The air blows into the line and conveys from the product source(s) to the product destination. A filter at the destination cleans the exhaust air. This is the most popular configuration

2. Dilute Phase Vacuum
The air is sucked through a filter at the destination, drawing product into the air stream. The method is ideal for manual or bag unloading stations or other portable product sources.
Dilute Phase for pneumatic conveying typically has the lowest initial investment cost

Dilute Phase

 

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