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RAP Preheating System Provides Economical Solution
The Shelly Company, an asphalt producer with 47 plants located throughout Ohio, puts new RapSaver technology to the test in an effort to economically increase the use of reclaimed asphalt pavement (RAP), while lowering emissions
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How does it work?
The RapSaver is a preheating system comprised of a continuously fed sealed conductive heating system that allows cold wet RAP to be heated and dried using a slow moving hollow screw heating auger and heated trough.
Heat exchange fluid is brought to a temperature level of about 600 degrees F with a direct-fired tube in tube exchanger or helically coiled hot oil heater. The hot fluid is pumped through the hollow jacket and the hollow auger flights slowly elevating overall RAP temperatures to 165 to 185 degrees F with a portion of the smaller particle sizes ranging in excess of 350 degrees F forcing moisture to escape.
In a single pass with variable 4- to 12-minute dwell times a process flow rate of 80 to 100 tons per hour can be achieved depending upon moisture content. With inlet RAP moistures of 5 percent of less, RapSaver has been able to dry RAP to 1 percent moisture and less in a single pass.
A shared interest
The Shelly Company, an Oldcastle Materials Inc. subsidiary with 47 plants in the state of Ohio had shown keen interest in the RapSaver prototype. On several factory visits to Burke's Carrolton manufacturing facility, Vice President Jim Tharp and Operations Manager Paul Protengeier were impressed with the RapSaver concept and production capacity and decided to install one at their #93 plant site in Columbus, OH.
"RAP is here to stay, and we felt if we are going to stay, we need to know and do more about using it," says Protengeier.
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