Selecting the source of the UV irradiation of grain in the belt-type plant

When treating grain before germination, high bactericidal effect is observed if grain is disinfected with ultraviolet (UV) irradiation. It is expedient to treat grain and seeds and disinfect food products with the help of linear irradiation sources. However, there are no studies on the determination of a linear source and its location, taking into account the design features of the considered device. Proceeding from this, the authors justified the choice of a linear irradiation source for UV treatment of grain on the belt-type unit. To implement the method of UV treatment in mobile belt-type units, they suggest a mathematical model for calculating the energy illumination from a linear source of UV radiation, taking into account the suspension height, power, length of the irradiation source and the recommended level of energy illumination of the conveyor belt not less than 9 W/m². The experiment was conducted to study the performance of the lamps of DKBU‑7 and Uniel ESL‑36 types. A UV lamp with reflector was placed at different control distances above the irradiation zone. Taking into account the design features of the belt-type unit, the authors chose the width of the treatment zone of 200 mm, the height of the irradiation source suspension of 100 mm, and the length of the treatment zone of 1200 mm. Energy illumination parameters were measured using a three-channel UV-radiometer “TKA-PKM”. The discrepancy between the calculated and experimental values of energy illumination did not exceed 5%, which proved the adequacy of the proposed model. The analysis of the distribution of energy illumination of the surface within the width of the conveyor belt showed the expediency of using a lamp of the Uniel ESL‑36 type with the power of 36 W. The use of a parabolic reflector made of etched aluminum with the size equal to the width of the processing zone is preferable.

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