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Note: VINCENT CORPORATION WITHDREW FROM THE DRYER BUSINESS IN 2007.
IT WAS A GOOD RUN, FROM 1931 TO 2007. To fill your needs, you are referred to
- Baker-Rullman, Bruce Miller, brucem@baker-rullman.com, in Wisconsin
- Cook Machinery, John Cook, cookmachinery@verizon.net, in Florida; and
- FOMESA AGROINDUSTRIAL, Felipe Aunion, faunion@fomesa.net, in Spain.
Vincent drying systems convert waste foodstuffs from many industries into profitable by-products.
The Vincent Vacuo-Dehydrator removes moisture from a continuous flow of material. It is a direct fired dehydration system available in sizes ranging in capacity from 1,000 to 20,000 pounds per hour of water evaporation.
The Vincent Dehydrator is a three pass rotating drum machine with special lifting paddles on the inner and outer surface of each pass. The curtain formed by the material falling from these paddles as the drum rotates assures that all material being fed to the unit receives maximum exposure to the warm gas stream. The drum design and gradually reducing temperatures serve to form an operational balance between declining gas flow energy and declining material moisture content, thereby reducing the chances of burning the product or having it stick to the walls.
Upon leaving the Dehydrator, the material is separated from the air stream in a uniquely designed “low intake” Expansion Chamber. The dried material is drawn through this combination separation and drying chamber under vacuum stream conditions while being cascaded through the hot air stream.
A conventional “high inlet” Cyclone Separator can also be employed. This second devise can be installed in series with the Expansion Chamber when a natural grading of material size is desired.
The Vincent Dehydrator drum is available either in the rotating or stationary outer shell design. The stationary outer design allows the capability of re-cycling partially dried material. Many soupy or sticky materials, which are difficult to dry in most dehydrators, are effectively handled in the Vincent Dehydrator.
When specified with this recycling capability, the Dehydrator allows partially dried material to be mixed with incoming wet material, absorbing excess moisture. In this manner the moisture becomes distributed through a greater number of particles, allowing the mixture to dry easily and quickly. This mode of operation does not reduce the capacity of the Dehydrator.
Operation with the recycling feature is automatic and continuous, yielding high product quality with a minimum of operator attention. Extraction gates allow easy adjustment to compensate for changes in product consistency.
The Dehydrator is fed by a variable speed air lock screw conveyor. This can be easily adjusted through a wide range of speeds to match variations in required evaporation rates.
The Vincent Dehydrator drum is completely assembled and aligned for ease of installation. All parts subject to thermal expansion are provided with expansion joints, resulting in long trouble free operation. The unit is mounted on a rigid frame, which minimizes the cost of the concrete foundations and which keeps the machine in better alignment. The standard drive arrangement for the Vincent Dehydrator is a heavy duty gear reducer, mounted on a jackshaft with roller bearing pillow blocks.
All models are of fabricated design and are available in carbon steel, partial stainless, and all stainless construction. The drum assembly turns on machined steel tires at either end which are supported by roller bearing trunnions.
PRINCIPLES OF OPERATION
Material enters the Vincent Dehydrator drum at the furnace end through the throat, and removal of water begins immediately. The evaporation of water maintains the product temperature at the dew point condition where the highest efficiency of evaporation occurs.
A temperature monitor at the inlet to the third pass of the drum senses any variation in gas temperature. This correlates to the moisture in the product and automatically adjusts the fuel supply to the furnace. This controls the moisture content of the dried product. Moisture content of plus or minus 1/2% on overall product dryness at pre- determined levels can be attained.
Material is drawn through the concentric drums by the exhaust fan vacuum. As the material dries the density decreases so that it is drawn further through the Dehydrator until only particles of the required moisture content pass out of the drum. The possibility of damage to the product by high temperatures is avoided in the process.
EXPANSION CHAMBER AND CYCLONE SEPARATOR
The Expansion Chamber is fitted to the output end of the Vincent Dehydrator. It is a large tank in which the dried material is separated out of the hot air stream. Material collected in the chamber is then screw fed out of the base through an air lock.
| MODEL | FOOTPRINT | SYSTEM POWER REQUIREMENT |
HEAT INPUT ‘000 BTU/HR |
WATER EVAPORATION (LB/HR) |
|---|---|---|---|---|
| 10 | 5’3″ x 34′ | 10 hp | 1,760 | 1,000 |
| 25 | 7’6″ x 48′ | 20 hp | 4,000 | 2,500 |
| 50 | 8’6″ x 60′ | 37 hp | 8,000 | 5,000 |
| 75 | 9’6″ x 66′ | 50 hp | 12,000 | 7,500 |
| 100 | 10’3″ x 70′ | 63 hp | 15,000 | 10,000 |
| 150 | 11’6″ x 76′ | 84 hp | 22,500 | 15,000 |
| 200 | 13’6″ x 88′ | 125 hp | 30,000 | 20,000 |
VINCENT DIRECT HEAT FURNACES
Vincent Furnaces are designed to form part of a complete Dehydrator system, which includes the Controls, Burner, Furnace, Dehydrator, Expansion Chamber, and Exhaust Fan. Each furnace is performance matched to supply direct heat to the product. Furnaces can be fired with heavy or light fuel oil, or natural gas, or they can be fitted with combination burners. In addition the furnaces are designed for either direct flow-through of the hot gases or they may be designed to recycle part of the heating gases. The selection depends on the type of material to be dehydrated.
The standard furnace configuration allows the products of combustion to pass directly through the drum, separation equipment and out the stack. In more demanding situations provision is made to recirculate a portion of the gasses from the discharge of the separation equipment back to the inlet of the furnace. This arrangement both reduces dryer temperatures and increases the combustion of noxious fumes and combustibles.
A final option available is an afterburner furnace. This is used where there is a severe need to oxidize fumes and particulates prior to discharge to the atmosphere.