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Pneumatic low-pressure conveying

Excellent availability and operational safety

To ensure an excellent level of availability and operational safety for an extraction plant, discharge devices and conveying mechanisms are just as crucial as fans and filter systems. For more than 50 years, Scheuch has been producing rotary valves, screw conveyors, dosage devices and pendulum flaps.

Extraction, filtration and material discharge devices, as well as conveying systems, thus form a single unit that consists of sophisticated and time-tested components. Conveying systems consist of a material feed unit (discharge device), a conveyor and a separator at the silo or container.

Three different varieties:

Low-pressure conveying systems

The conveying system transports the material separated in the filter to a location where it can be stored temporarily. In this case, the system is a pneumatic low-pressure type. The conveying air must be filtered in the storage area once the material has been fed in, and then released into the atmosphere.

1. Material separation in silo – axial inlet and integrated filter
The material is blown into the centre via the silo roof. The conveying air is purified by a filter integrated in the silo and then released into the atmosphere. Slight overpressure can occur in the silo.

2. Material separation in silo – filter and rotary valve
The material is separated by a filter and is allowed to drop freely through the silo roof via a rotary valve. The conveying air is purified by the filter and then released into the atmosphere.

Low-pressure conveying systems with closed circular pipelines

The conveying system transports the material separated in the filter to a location where it can be stored temporarily. In this case, the system is a simple low-pressure type. In this case, the conveying system is a closed circular pipeline type. Once the material has been fed into the storage area via the piping, the conveying air is carried to the feed unit and connected to the conveyor line. The conveying air is carried by the closed circular pipeline – therefore, in a ring.

1. Cyclone and rotary valve
The material is separated by a cyclone and is allowed to drop freely through the silo roof via a rotary valve. The conveying air is sucked in again through the closed circular pipeline.

2. Axial inlet and return line
The material is blown into the centre via the silo roof. The conveying air is sucked in again through the closed circular pipeline. Slight overpressure can occur in the silo. An air compensation shutter is provided to prevent negative pressure.

Scheuch PAEM 500

The Scheuch PAEM 500 filling device is installed in the centre of the silo roof. This is hypothetically based on a cyclone with an integrated pressure-relief stack. The material is blown in via the PAEM 500 and falls into the silo in the centre. The conveying air is sucked in again through the closed circular pipeline. Slight overpressure can occur in the silo. An air compensation shutter is provided to prevent negative pressure.

Pneumatic low-pressure conveying in Action