Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1975-09-15
1977-04-19
O'Dea, William F.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 30, 34 38, F26B 306
Patent
active
040179818
ABSTRACT:
Young grass having a moisture content of about 80% is dried in layers by forcing a stream of air through the layer. The thickness of the layer and the conditions of the drying air are adjusted so that when most of the grass in the layer is sufficiently dry (about 12% moisture), there will still be present an outer layer which is by far not dry (moisture content of about 65%). Thereby, the drying air emerging from the layer will have a humidity of approximately 100%, meaning that the drying capacity of the air has been exhausted. When the humidity of the drying air emerging from the layer falls substantially below 100%, the major part of the grass will have been dried to the desired dryness (about 12% moisture). It is then not economical to continue the drying process, which is consequently interrupted, the not yet dry minor part (outer layer) of the grass being transferred for drying together with further green grass in another drying process. Each process is carried out with non-heated atmospheric air from the beginning, but towards the end of the process, air of reduced relative humidity obtained by slightly heating atmospheric air must be used to reduce the moisture content in most of the grass to 12% before the moisture content in the outer layer goes below 65%. A simple, portable drying plant for carrying out the process in the field is also provided. The degree of heating and the beginning of the heated air drying can be varied, and the combination giving the best economy is determined by operational and local conditions, such as the number of drying plants operated together, the source of energy available etc.
REFERENCES:
patent: 1194351 (1916-08-01), Benjamin
patent: 2532530 (1950-12-01), Andersen et al.
patent: 2613452 (1952-10-01), Andersen et al.
patent: 3380174 (1968-04-01), McClaren
patent: 3417487 (1968-12-01), Harris
patent: 3449840 (1969-06-01), Francis
Johnson Arthur C.
Joyce Harold
O'Dea William F.
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