Pneumatic conveyor system DFP/DFH
The pressure vessel has established itself for pneumatic conveying with high pressures (long conveying distances) and high product concentrations (high delivery rates). In the case of poorly flowing products, it is possible to increase the flowability using additional measures (cone venting, mechanical discharge aids). Depending on the conveyed material and conveying distance, gravity draining (connection of the delivery line underneath the discharge funnel) or cover emptying (connection of the delivery line from above vertically into the protruding pressure vessel riser pipe) and various ratios of the upper, lower and secondary air supply. The pressure vessel can be loaded either in free fall or using suitable mechanical feeders.
The operation of a pressure vessel is always discontinuous; therefore a buffer container is arranged above the pressure vessel for continuously occurring material. If large delivery rates are required, two pressure vessels can be operated in parallel. While one is being filled, the other is emptying. An almost continuous delivery is achieved in this way. In every case, the supplied amount of material must not be larger than the capacity of the pressure vessel. The average availability of a single pressure vessel is 50% and that of a twin pressure vessel is approx. 90%.
The achievable delivery rate of any pressure vessel is decisively determined by the net capacity of the pressure vessel and the diameter of the delivery line. However, due to the often very different bulk weights, grain sizes, grain distributions and other physical properties of the bulk materials, no specific specifications for known delivery line cross sections and pressure vessel capacities can be made in advance.
Design of the MAHR pneumatic conveyor system: The conveyor system consists of the pressure vessel with the completely attached valves. It is ready for operation when connected to the compressed air supply and the electric controller.