Grain Drying Systems
The NECO fan, delivers large quantities of air through the transition. An adjustable baffle, I is located within this transition. It divides the air, letting part go through the heater, and part bypass the heater going directly into a section of the dryer dedicated to cooling the grain.
This baffle can be adjusted to fine tune the air distribution, providing the exact amount necessary for drying and cooling efficiently, based on ambient temperatures. Converting the NECO dryer to all heat requires only closing this baffle and opening a door within the plenum chamber.
The heated air is sent into the plenum chamber, In the plenum chamber there are a number of openings into inlet ducts, These inlet ducts are made in the shape of inverted "V's'. The inlet ducts are open on the inside of the air plenum, and on the bottom, but are not open to the outside of the dryer.
They extend through the grain column allowing air to enter the grain through their open bottom Because of their shape, there are no screens required to hold grain in the dryer.
Similar outlet ducts, are staggered between the inlet ducts. These ducts differ from the inlet ducts in that they are open to the outside of the dryer, but not to the inside of the air plenum. These ducts, like the inlet ducts, are open on their bottom.
The grain flows completely around both sets of ducts. For the air, that has entered the inlet ducts, to exit the dryer it must pass through the grain between the inlet and outlet ducts. In so doing, it picks up excess moisture from the grain. The moisture laden air then moves out of the dryer through the outlet ducts.
The grain columns are made up of a number of levels, or tiers, containing many sets of inlet and outlet ducts along their length.
All the grain must pass by a set of ducts in each tier as it moves downward through the dryer. Because of this action, the grain is exposed to the hottest air, for a short duration, several times while in the dryer.
Between exposures to the hottest air, the moisture within each kernel has the opportunity to equalise, this makes it easier to remove excess moisture during its next encounter with the hottest air.
Because the grain is moving around the ducts, it's automatically loosened and turned many times while travelling through the dryer, allowing the air to encircle each kernel, absorbing surplus moisture. The result is that all kernels are dried evenly without overheating or stress cracking.
A set of metering rolls, are located beneath the grain columns on each side of the dryer. The rolls are driven by a variable speed motor. The speed of these rolls is regulated by an electronic moisture control that measures the actual moisture content of the grain.
Metering roll speed is increased if the grain is drier, and decreased if it is wetter, than a preset level. These fluted rolls meter the grain into the column unloading augers. which moves the grain to the back of the dryer.
A cross auger, located at the rear of the dryer, collects the grain from the column unloading augers. This auger discharges the grain into a take away auger. This cross auger can be configured to unload to the right side, left side, or to the middle of the dryer
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