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Pneumatic conveying


Pneumatic conveying

Fundamentals - 1

1. Pressure conveying

The layout of pneumatic pressure conveyance basically consists of a pressure source, a material feed tank, a pressure conveying tank (or a cellular wheel sluice) with material feeding attachmet, as well as a receiving tank with a dust extraction filter at the end of the conveying pipe.

Within the scope of pneumatic pressure conveyance a distinction is made between continuous and discontinuous conveyance, and within the same context between between 3 different pressure stages:

1. Low pressure systems 0,0 - 1,0 bar
2. Medium pressure systems 1,0 - 2,0 bar
3. High pressure systems 2,0 - 5,0 bar

1.1 Continuous sluice conveying
Our extensive experience has shown that continuous sluice conveying finds only limited application. It is only used with conveying pressure of up to 0.5 bar. This results is a correspondingly low output.

The disadvantage of sluice conveying is that there is a continuously turning part within the material flow which leads to increased wear. This applies especially to the seals on the cellular wheel.

A further disadvantage arises due to air leakage. The cellular wheel sluice acts as an air pump - part of the conveying air constantly escapes through the gate and is therefore no longer available for conveying. The higher the conveying pressure, the higher the volume of escaping air.

1.2 Discontinuous pressure vessel conveying
Discontinuous pressure vessel conveying eliminates the above mentioned disadvantageous and allows conveying with pressures up to 5 bar, resulting in a correspondingly high output of up to 100 t (with a tandem conveying plant) and conveying distances of up to 2000 m.
Since there is no continuously turning part within the material flow, wear is appreciably reduced.

2. Suction conveying
Pneumatic suction conveying is especially suited to continuous conveying of bulk materials. Additionally, several material feeding points are possible in only one conveying line. Suction conveying is also suitable for the batching of raw materials. Here the material is conveyed in a suction weighing tank.

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Click To Expand - 81KB

Continuous sluice conveying:
Schematic diagram of cellular wheel sluice conveying with air leakage connection.

Click To Expand - 72KB

Discontinuous pressure vessel conveying:
Schematic diagram of pneumatic, discontinuous pressure conveying

Click Top Expand - 40KB

Flow diagram of a pneumatic suction conveying system

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Technical changes and errors excepted. 2001 Beckschulte Verfahrenstechnik GmbH