Ways to increase the storage life of grain life.

• TRAY DRYER: A Tray dryer is a convectional drying equipment with enclosed insulated chambers and trays placed on top of each other in a trolley. The driers are used in processes where drying and heating are a crucial part of the industrial manufacturing process such as in the food products, pharmaceutical, dye stuff, chemicals and agricultural products.

• BAND DRYER: The band dryer is the typical continuous convection heat transfer type of dryer, which has been improved and modified over many years. This is a hot air type of dryer, where the materials are placed on a band conveyor (steel or perforated plate, etc.) and are dried by hot air as they move through the drying chamber. In general, the band dryer forcibly passes hot air through the gaps in the material layers to dry the material.

• ROTARY DRYER: Rotary dryers work by tumbling material in a rotating drum in the presence of a drying air. They can also be indirectly heated to avoid direct contact between the material and processing medium. The drum is positioned at a slight horizontal slope to allow gravity to assist in moving material through the drum.

• ROLLER DRYER: A roller dryer consist of a cylinder, heated from the inside by stream. A thin film of the product is sprayed on the outside of the cylinder and it is heated while the cylinder rotates. The rate of drying and the final water content in the product is affected by the a) Rotational spread of the roller, b) Steam pressure, c) Thickness of the film, and d) Properties of the product. Owing to the sort contact time in combination with high drying temperature, the roller dryer is well adapted to heat sensitive products. Typical applications are fabric drying in textile industries and paper band drying in paper mills.

• FLUIDIZED BED DRYER: In Fluidized dryer the particles are fluidized by air or gas in a boiling bed unit. The average time a particle stays in a bed is usually between 30 and 60s. If fine particles are present, there may be considerable solids carried over with the exit gas, and cyclones and bag filters are needed for their recovery.

• SPRAY DRYER: Spray drying is the transformation of feed from a fluid state into a dried particulate form by spraying the feed into a hot drying medium, used commercially for the production of food powders due to its effectiveness under optimum condition [15]. It involves evaporation of moisture from an atomized feed by mixing the spray and the drying medium (air). The drying proceeds until the desired moisture content is reached in the sprayed particles and the product is then separated from the air. The mixture being sprayed can be a solvent, emulsion, suspension or dispersion. The main objective of spray drying is to get most rapid liquid removal with minimal negative impact on product, with low water activity and reduced weight, resulting in easy storage and transportation.

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