![]() Once the pressure vessel is filled, the inlet and vent valves close and seal, and highpressure air is gradually introduced into the pressure vessel. Low-pressure displacement blowers or fans supply a beginning pressure below 15 psig and an ending pressure near atmospheric pressure.įirst, the materials is charged into the pressure vessel through the rotary air lock. Systems using high-pressure compressed air, operate with pressures above 15 psig, usually with a beginning pressure of about 45 psig and an ending pressure near atmospheric pressure. A pressure vessel, the conveying line, and the receiver make-up the balance of the system. The basic components of a pressure system are a rotary air lock feeder valve, a high pressure air compressor system or a low-pressure positive displacement blower or fan to serve as the power source. Material is constantly supplied at the pickup point and is conveyed to the receiver without interruption. Dilute phase systems usually deliver the material continuously. In this type of system, the material is most often fluidized, or suspended in the air flow, and moves at relatively high velocities depending on the particle size and density. Valving systems can be adjusted to reduce the air pockets.ĭillute phase conveying systems have a high air-tomaterial ratio. Dense phase systems, therefore, move the material through the piping in batches, with discrete dunes or plugs of material separated by pockets of air. Velocities are below the saltation level, the critical velocity at which particles fall from suspension in the pipe. Pressure and vacuum systems can be used for dense (high pressure/ low velocity) or dilute (low pressure/high velocity) phase operation.ĭense phase conveying systems have a low air-to-material ratio. Pneumatic conveyors can utilize either a pressure system that introduces compressed air at the system inlet in order to push the material through the piping or a vacuum at the delivery end in order to pull the material through the piping. The Differences and Similarities in Pneumatic Conveyors Pneumatic conveyor systems, which use an air stream to move materials through horizontal and/or vertical piping, come in two forms: pressure or vacuum. Another important advantage is flexibility in routing – we can convey material to places others can’t.Choosing a Pneumatic Conveying System: Pressure or Vacuumīecause they are efficient and inherently dust-tight, pneumatic conveying systems provide the most practical method for moving large quantities of dry materials, whether powdered, granulated, or pelletized. Fewer moving parts mean fewer headaches, and an enclosed system means easy dust control. There are many advantages to pneumatic railcar unloading compared to mechanical conveying. Savings in the use of horsepower translates into less system heat and product degradation. Our unique design concept provides for limited maintenance and prevents premature wear on components. Each component of a system acts on the air and materials in ways specific to the properties of the air and materials and to the air-to-material ratio itself. ![]() However, applying an off-the-shelf solution can – but usually does not – give customers the best value so we custom-design our systems around your specific application and material.Ĭarrying tons of dry bulk material through a pipe with air molecules requires tons of air molecules operating under a given amount of pressure. Pneumatic conveying is an elegant, efficient solution for moving dry bulk material.
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