Fluidised bed dryer

Under tropical climatic conditions of high rainfall serious problems are encountered during drying of paddy. A study was undertaken to develop and efficient low cost fluidized bed dryer for parboiled paddy which utilizes paddy husk as fuel for heating of drying air.

The optimum conditions for drying parboiled paddy having a moisture content of 32% in the fluidized bed dryer delivering 8 m/s and pressure 1000 Pa were drying 0.632 tons of grain at a bed thickness 200 mm and drying air temperature 50 C.

The advantages associated with fluidized bed drying of parboiled paddy are simplicity of design, shorter drying time, low temperature drying, low energy consumption, improvement of grain quality and the by-passing of the tempering periods.

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