Rotofeed Pneumatic Injector0 pages

Rotofeed Pneumatic Injector

Introduction
Schenck Process RotoFeed range is designed to effectively inject
solid materials into processes, either continuously or on a batch
basis, to one or multiple points.
This system injects materials with accuracies of 2% by volume
or 0.5% by weight depending on the control method employed volumetric or weight related respectively. Materials can be injected
into processes at distances of up to 500 metres, with back pressure
of up to 30 bar(g).
The vessel utilises the Original Dome Valve™ and the RotoFeed
pneumatic injection dispensing unit.

The original Dome Valve®
Central to the operating efficiency of all Schenck Process pneumatic
conveying systems, or as a stand alone valve is the original Dome
Valve ® which incorporates a unique and highly reliable inflatable
sealing arrangement. The original Dome Valve ® was developed by
Clyde Materials Handling* in 1974 for use with pneumatic conveying
systems and as a stand alone product.

The Operation of a RotoFeed
The RotoFeed machine consists of two pressure vessels, a rotating
volumetric feeder at the outlet and valves to control the air supply,
material flow and vessel pressure. The volumetric feeder will be driven
through a gearbox by a standard induction motor.

The dispensing vessel is used to provide a constant
supply of material to the volumetric feeder. When
material is being injected, the dispensing vessel will
be pressurised. The lock vessel is used to periodically
replenish the dispensing vessel with material. In
this way, injection of material to the process can be
continually maintained.
The conveying air will enter the cupola along with the
material and will leave the cupola along with the other
process gases.

RotoFeed Applications
The RotoFeed system has been widely used in the
steel and pig-iron industries, in order to continuously
inject coal into their blast furnaces, reducing the
requirements of coke, and allowing fines to be injected
straight into the blast furnace.
Injection rates usually average at 185kg/ton of hot
metal, although some operations have injected up to
210kg/ton.
Example: A pulverised charcoal injector, with injection
capacity equal or superior to 150kg/ton of pig iron.

*Clyde Materials Handling Ltd was purchased by Schenck Process in 2011 and the Original Dome Valve™ is part of Schenck Process technologies