Used Dryer equipment

Dryers
Industrial dryers are used to remove moisture from a product. They operate under different pressures and temperatures depending on the material and process used. Special Projects International offers used dryers of all kinds from well-known manufacturers like Boen Engineering, Carman, Devine, Gemco, Groen, Komline-Sanderson, Niro, Patterson-Kelley, Proctor-Wolverine, Stokes, Unico, Virtis, Wyssmount, and more. The different types of dryers we have are categorized and described below.

Belt Dryers/Apron Dryers
Belt dryers (aka conveyor dryers or apron dryers) are rotating belt conveyors typically equipped with a perforated belt to allow heated air to circulate through the belt and the wet feed. As the drying gas flows through the perforations, the wet feed is dried. These dryers are commonly used in the chemical, pharmaceutical, and food industries. Belt dryers are generally suitable for coarse materials such as pellets or granules.

Double Cone Vacuum Dryers
Double cone vacuum dryers have a jacketed outer cone that is heated and an inner cone with a vacuum applied. The product to be dried is warmed as it enters the cone. The slow rotation and strong vacuum within the cone continuously moves and dries the starting material. The double cone vacuum dryer is commonly used to dry all types of moist, crystalline, and amorphous heat-sensitive materials.

Electric Air Duct Heater
Electric air duct heaters use electricity to warm the air that passes through a duct. A heating element within the duct converts electricity to heat, and the resulting heat is transferred by conduction or convection to the air passing through the device. Electric air duct heaters are used in various settings to heat air and/or gas process streams for humidity control, machinery pre-heating, or HVAC comfort heating. These machines are commonly found in oil refineries, petrochemical plants, or warehouse buildings.

Fluidized Bed Dryer
Fluidized bed dryers work on the principle of fluidization, a process where material is converted from a static solid-like state to a dynamic fluid-like state. In order to do this, the fluidized bed dryer has a perforated distribution plate where hot gas or air is pumped from beneath as the solid particles flow on top. When the upward force on the particles increase enough to equal the gravitational forces below, the particles enter a state of fluidization where they appear to be suspended in a boiling bed of liquid. This state of fluidization allows each particle to be in direct contact with, and surrounded by, the hot gas or air which produces an efficient and uniform drying process.

Freeze Dryers
A freeze dryer works by first freezing the material, then reducing pressure and adding heat to allow the frozen water in the material to change directly into a vapor through sublimation. Freeze dryers are commonly used in the food industry.

Fumigators
Fumigators add or remove amounts of moisture to bulk products such as tobacco, starches, etc. This is accomplished by adding steam heat, evaporating by reducing pressure (vacuum), and repeating as necessary.

Rotary Steam Tube Dryers
“A steam tube dryer is an indirect heat dryer that uses steam tubes disposed inside the rotating shell as the heat source. Steam is introduced into a header through a rotary joint and then distributed into the tubes. The header is also provided with condensate ejection pipes which discharge condensate as quickly as formed. The material to be dried is fed into a screw feeder through a chute and then into the steam tube dryer. Drying temperature can easily be adjusted by controlling steam pressure, thereby providing favorable conditions for heat-sensitive materials.” Rotary steam tube dryers are the most efficient of all dryers.

Rotary Tray Dryers
Rotary tray dryers (also called turbo dryers) consist of a stack of slowly rotating circular trays. Material is fed onto the top tray. After one revolution the material is wiped onto the next lower tray where it is mixed, leveled, and then after one revolution, is wiped to the next tray where operation is repeated. The trays are contained in an enclosure in which heated air or gas is circulated by internal fans. Rotary tray dryers can operate as a dryer, cooler, reactor, heat treater, calciner, humidifier, agglomerator, sublimer, or roaster by adjusting temperature and timing settings.

Rotary Vacuum Dryers
A rotary vacuum dryer is a horizontal cylindrical jacketed shell with hollow agitator, rotating in close clearance. Rotary vacuum dryers function in batch operation where drying is done under vacuum and heating is accomplished through the jacket. The dryer offers a simple but effective method of drying wet cakes and sometimes slurries. These dryers are commonly found in the chemical and mineral industry. In the food industry, they are often used to dehydrate waste materials like citrus peels or vegetable trimmings.

Screw Dryers
Screw dryers consist of a helical screw blade mounted in an enclosed U-shaped trough. The screw is connected to a rotating drive shaft. The material is fed at the infeed, and the screws convey the material forward while drying until it reaches the discharge. Some screw dryers have heated screws and jacketed troughs to make drying a faster and more efficient process. Screw dryers are often used to dry powders.

Twin Shell V Tumble Dryers
Twin shell v-shaped tumble dryers are some of the most cost effective and energy efficient drying machines. These dryers are often jacketed, so the temperature and pressure is controlled accurately. This makes them ideal for drying delicate and friable solids such as crystals, pharmaceutical powders, or agglomerated solids.

Vacuum Shelf Dryers
Vacuum shelf dryers are air-tight vessels ideal for drying products that require uniform, low temperature drying with no agitation or compression. Reducing the atmospheric pressure within a vessel makes material dry faster through low temperature evaporation. These dryers are often used to dry pharmaceuticals, nutraceuticals, vitamin extracts, and fine chemicals.