Grain-dryers with dust-cleaning, “Central separator” type
The basic function of grain-dryer manufactured by ROMAX is drying of grain crops, grain legumes and oil-producing crops, namely moisture reduction of dried product up to values, at which the product (grain) could be safely put for long-term storage, without fear of self-heating emergence. When drying mode is selected correctly, physiological ripening of the grain and its quality improvement takes place.
For exhaust air cleaning from grain dust, special mechanisms can be installed on ROMAX dryers. One of them is central separator (Centroseparator), which represents a fan with deposit chamber for light particles collection. A device of such type requires high power consumption and works with large air volume.
The grain for drying is loaded into the dryer, filling sections of buffering 1, drying 2 and cooling 3 until actuation of the upper level sensor.
The heated in the heat generator 4 air comes by the hot air inlet channel 5 into air inlet channels of drying (cooling) sections. Then the heated air passes through the grain mass layer, heats it up, absorbs moisture and leaves by cold (exhaust) air channels 7. Cooled and moisture saturated air enters the common outlet channel of exhaust air 8 and is drawn out by fans 9 with dust cleaning system “Centroseparator”. Light particles are separated from the exhaust air mass and enter the aspiration waste collection system.
Then the grain, fed from above, is moved downward from drying section 2 into cooling section 3, where dried (heated) grain is cooled. To do this, hot air flow channel 5 is blocked by valve 10 and opening valve 11. After that the access for atmospheric air is open to cooling section air channels 6. Atmospheric air absorbs heat of the heated grain and leaves through outlet air channels 7 into the common outlet channel 8.
The cooling section may be used as drying section. The valve 11 blocks access to atmospheric air, and by opening of valve 10, the air, heated in the heat generator, enters the cooling section air channel where grain is dried similarly to the procedure in the drying section 2.
The cooling section may be used as drying section in the following cases:
After cooling, the grain is moved towards discharge 1, where dried (cooled) material is dosed from wells by a system of rollers. This makes it possible to choose the accurate rate of grain speed, passing through the dryer, to reach corresponding end moisture content.
Dosing rollers supply grain into the hopper, where it is taken out by a discharge conveyor.