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Молочнохозяйственный вестник, №4 (24), IV кв. 2016 227
рефераты
температуру. Повторность опытов – трехкратная. Выявлено, что чем больше высота
входного и выходного окон камеры, зависящая, в свою очередь, от толщины слоя
льнотресты, входящего по транспортеру в сушильную камеру, тем дольше нужно
сушить материал и тем больше величина вредных излучений. Разность температур
объекта сушки при закрытой и открытой камере составляет 20 °С (19%), а утечки
СВЧ-излучения увеличиваются от 0,5 мВт/ до 3,2 мВт (на 84%).
Определено, что нагрев льнотресты по объему в сушильной камере идет весьма не-
равномерно, при этом определенной закономерности распределения СВЧ-мощности
по объему навески льнотресты при изменении размеров входного и выходного
окон не наблюдается. В закрытой камере процесс сушки идет интенсивнее ввиду
незначительности утечек СВЧ-излучения, благодаря чему температура льнотресты
при сушке в закрытой камере в аналогичные периоды времени выше. Время
сушки при полностью закрытой камере снижается со 180 до 120 с (на 33%) при
используемой мощности СВЧ-излучения 160 Вт и со 100 до 60 с (на 40%) при
используемой мощности СВЧ-излучения 750 Вт.
Summary
The subject of our research is the regularity of the process of flax microwave drying
in the tape. The object of our research is a flax variety, Marilyn. Studies are conducted
in the Vologda region. The design of proposed device for microwave drying of flax is
offered. Experimental studies were carried out by three stages: determination of losses
of microwave power and magnitude of leakage of microwave radiation depending on
the size of the flap opening in the drying chamber simulating the height of the input
and output windows; determination of the uneven distribution of microwave energy by
the volume of extra dried material; research of the process of flax drying in the drying
chamber. To determine the losses of the microwave power and the magnitude of the
leakage in microwave radiation a container of water with an initial temperature of 17
°C was placed into the chamber. At different positions of flap the unit was switched
on for 1 min, then the magnitude of leakage and the temperature of the water were
measured. To determine the uneven distribution of microwave energy by the volume
of extra dried material a portion of the flax was placed in the drying chamber and
dried at a maximum power of 750 W for 3 minutes at different positions of the flap in
the drying chamber, then the temperature of flax at several points was determined.
To study the drying process a samples of flax were placed in the drying chamber and
dried with different capacities (750 W, 455 W, 160 W) to a moisture content of 12%
with a closed drying chamber and opened to 6 cm (which corresponds to the thickness
of the layer of flax), during the experiments, we measured the moisture content of flax
in accordance with GOST R 53143-2008, as well as its temperature. The repetition of
experiments is three times. It is determined that the greater the height of the input
and output windows of the camera, depending, in turn, on the thickness of the layer
of flax incoming onto the conveyor in the drying chamber, the longer you need to
dry the material, and the greater the amount of harmful radiation. The temperature
difference between the drying object in the open and closed chamber is 20 °C (19%),
and the leakage of microwave radiation increases from 0.5 mW/sq cm to 3.2 mW/sq
cm (84%). It is determined that the heating of flax by volume in the drying chamber
is not even, with certain patterns of distribution of microwave power over the volume
of the sample of flax when the change of size of the input and output windows is not
observed. In the closed chamber the drying process is more intense according to the
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