Rationale for the use of superheated steam for hydrothermal processing of cereal grains
In article it is offered for hydrothermal processing (HTP) of cereal grains (buckwheat) before his peeling to use as warm and the moisture carrier superheated steam with low overheating. Such treatment is represented by a continuous process of the step of heating and humidifying the grain by condensing steam on its surface to the step of drying at a constant rate. When using steam of low overheating of ∆Т = 10 - 15 К and completion of HTP with grain drying to moisture content of 16 - 17 %, it is possible to further dry to normalized moisture content in an autonomous dryer in one pass, which is optimal for this operation. With overheating of ∆Т = 20 - 30 К steam and duration of HTP 8.5 - 12.5 minutes, the pre-treatment process can be considered completed, and the grain is prepared for its further exfoliation. In the considered cases, the processed grain had satisfactory technological indicators: exfoliation coefficient 58 - 67 %, nucleus integrity coefficient 62 - 66 %, exfoliation efficiency coefficient 60 - 66 %.