Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1980-05-19
1982-01-05
Schwartz, Larry I.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 65, 34168, 34174, 34236, 432 14, F26B 314
Patent
active
043086691
ABSTRACT:
A continuous grain drying and conditioning apparatus of a type including a burner and blower, or a multiplicity of burners and blowers, surrounded by a plenum chamber, air pervious grain holding walls positioned outwardly with respect to the plenum chamber is characterized by having a plenum divider which is selectively adjustable in position to divide the grain holding walls into a heating section and a cooling section. A multiplicity of grain turning apparatus of full and partial width of the grain column is disposed in the grain column for separating the grain mass into two or more separate divisions and then turning the cooler-wetter grain inwardly as it moves downwardly and turning the hotter-dryer grain outwardly as it moves downwardly in the grain column. Grain is constantly removed from the bottom of the apparatus at a rate governed by the average temperature of the air exiting the grain at a point adjacent the position of the plenum divider and a point closer to the input of the grain. Grain to be dried and conditioned is constantly introduced into the top of the apparatus at a rate that satisfies the rate of discharge of the dried and conditioned grain as it is delivered out of the bottom of the apparatus. Structure and management is also provided for controlled recycling of unsaturated exhaust air back through the dryer, whereby, the exhaust air is selectively proportioned and controlled based on the degree of saturation of the lower portion of the exhaust air. Further control of the recycled air is obtained at the level adjacent to the closed plenum divider level by a door positioned in the weathershield which design causes a separation between upper heated exhaust air which is diverted into the corner column for return to the blower, and the lower cooling air which is drawn by vacuum through the grain column cooling the grain. A still further consideration in this air control door is that the sloped separator panel is controlled by gravity, spring, or other closing means such that when grain particles or other foreign material builds up on the upper surface to a weight greater than the force holding the door closed, the door automatically begins to open, giving visual indication of needed cleanout, of vital importance in column grain dryers for optimum timing of housekeeping to maintain clean grain panel exhaust area and prevent fire hazards. A further modification of this air control door provides a means of using the entire grain column for drying when cooling of the grain is not desired by closing all cool air inlet louvers and positioning the air control doors at a position intermediate between fully closed as discussed above and fully open as for cleanout or supplemental cooling air inlet.
REFERENCES:
patent: 2548262 (1951-04-01), Hintz
patent: 2654590 (1953-10-01), Molenaar
patent: 3864845 (1975-02-01), Cooper
patent: 4149844 (1979-04-01), Noyes
Noyes Ronald T.
Williams Eugene E.
Beard Industries, Inc.
Schwartz Larry I.
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