Results of laboratory studies of grain drying in fluidized bed dryer

Abstract

A paper presents mathematical modelling and experimental results of grain drying in a dryer with pseudofluidized bed with intermittent drying media supply, working on producer gas. A system of four differential equations that interconnects the grain moisture content and temperature and drying media temperature humidity are presented. Straw and producer gas consumption for grain drying is presented. A multifactor experiment is done, where the drying media temperature, number of sections and sections blowing time are variable factors. Response surfaces are built on these data. Experimental results let us define the optimal calm period to the blow period ratio and drying media temperature that provide the highest grain moisture evaporation tempo. The obtained measurement results are in high correlation with the calculations. It illustrates that using gasifier technologies to supply grain dryers is expedient and provides high indexes of economical, energetic and ecological effectiveness, when using straw with the moisture content range of 10-30 %. Using this dryer lowers specific expenses on after harvesting post processing up to 30 %.