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
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
to next page.
To Expand - 81KB
Continuous sluice conveying:
Schematic diagram of cellular wheel sluice conveying with air leakage
To Expand - 72KB
Discontinuous pressure vessel conveying:
Schematic diagram of pneumatic, discontinuous pressure conveying
Top Expand - 40KB
Flow diagram of a pneumatic suction conveying