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Drying & Thermal Solids Processing Spotlight - October 2010

October 19, 2010

105843.tifRotary Calciners
Custom-designed to meet your processing requirements, Bartlett-Snow rotary calciners continuously process granular materials and powders at high temperatures, exceeding 1500ºC, in oxidizing, inert, or reducing atmospheres. The design consists principally of an inclined rotating cylinder that is enclosed in a furnace along its active length, featuring gas, oil, dual-fuel burners, or electric heating elements. Available in sizes from 6 to 120 in. in diameter, these units can be equipped with gas-tight seals that prevent interchange between the internal atmosphere and local ambient conditions. Special internal flight design promotes gentle tumbling action and provides for uniform exposure and efficient heat transfer. The benefits when compared to conventional tunnel kiln or mesh belt-style equipment include maximum product uniformity, reduced processing time, reduced operating costs, and lower capital costs. Alstom Power Inc., Air Preheater Co., Raymond Operations, Warrenville, IL 630-393-1000 www.bartlettsnowcalciners.com

105844.tifDrying/Thermal Processing Systems
This company supplies rotary dryers, coolers, kilns, calciners, and combination dryer-coolers. All designs are developed with efficiency, durability, and process flexibility in mind. Thermal systems can be designed in virtually any configuration: parallel flow or counter-current flow; direct or indirectly fired; utilizing a variety of fuel sources such as natural gas, oil, steam, waste heat, steam, etc. Single stand-alone thermal processing units or complete systems can be supplied. Feeco International Inc., Green Bay, WI 920-468-1000 www.feeco.com

105846.tifDehumidification Systems
These liquid and dry desiccant dehumidification systems deliver precise, energy-efficient temperature and humidity control for conveying and storing dry bulk products. Common applications include silos as well as unloading and conveying systems. In addition to providing consistent temperature and humidity control, the systems: eliminate mold growth; neutralize airborne microorganisms for bacteria-free air; improve product quality and extend shelf life; lower production costs for heat-sensitive drying; maximize production rates by eliminating downtime; prevent product sticking and lumping; help avoid blockages in conveying lines; stop product from sticking to silo walls. Kathabar Dehumidification Systems Inc., Buffalo, NY 716-875-2000 www.niagarablower.com

The Bella mixer/dryer/cooler dries and cools powders, granulates, and filter cakes. The dryer can be used for drying, mixing, spraying, agglomerating, and cooling in the same unit without additional equipment or costs. Operation is extremely efficient because air flows around material while it is suspended in the weightless zone of the mixer. This maximizes the total surface that is exposed to the air, increasing the desired effect. The drying process will go through an adiabatic evaporation with thermal efficiency at about 80 percent. Smaller air volumes are required when compared with other fluidizing dryers. Benefits include: better air distribution which increases drying/cooling efficiency; homogeneous mixing during drying/cooling process; low air volume reduces filter requirements, rotating paddles prevent material lumping and air channels. Dynamic Air Inc., St. Paul, MN 651-484-2900 www.dynamicair.com

109443.tifDewatering/Drying System
This dewatering/drying system consists of a 30-in.-diam circular vibratory screener that removes oversize and undersize particles and up to 50 gal of water per minute, integrated with a 40-in.-diam circular fluid bed dryer that dries up to 700 lb of on-size particles/hr. The screener’s vibratory action causes oversize particles to discharge through a spout at the upper screen’s periphery, on-size pellets to discharge through an extended spout at the lower screen’s periphery, and undersize fines and water passing through the lower screen to discharge through a third spout. The circular (versus rectangular) configuration of the fluid bed dryer consolidates system components, eliminates the need for heavy-gauge walls and braces, has fewer weld seams, cuts cleaning time 50+%, allows downsizing of vibratory motors, requires only one air inlet and outlet, and reduces cost, especially when finished to 3-A, FDA, and BISSC standards. Kason Corp., Millburn, NJ 973-467-8140 www.kason.com

105853.tifDispersion Dryer
The PCX dispersion dryer has an internal design that provides increased particle surface area, increased airflow, and higher temperatures to maximize drying efficiency. The design provides twice the evaporation rate of conventional PC dryers, saving time and energy. The unit has a small footprint, making it easy to accommodate your facility’s layout and save valuable plant space. Cleaning is fast and simple too, as all critical internal components are easy to access. Material can be tested in the company’s full-scale pilot plant to gather necessary data for scale-up to production size capacities required for specific applications. Bepex International, Minneapolis, MN 612-627-1415 www.bepex.com