Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1983-01-06
1984-08-28
Camby, John J.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 92, F26B 504, F26B 1330
Patent
active
044675321
ABSTRACT:
An apparatus and process for drying lumber under vacuum conditions using a drying vessel operationally connected to a sump which collects the extracted moisture. Vaccum conditions are maintained in the vessel and in the sump within the range of 10,000 to 15,000 microns, which reduces the boiling point of water to less than 80.degree. F. The temperature within the vessel is raised to approximately 105.degree. F. by a heating source and this combination of reduced pressure and elevated temperature causes the moisture in the lumber to boil off as vapor. This vapor is condensed inside the vessel by refrigeration coils cooled to a temperature between 36.degree. F. and 42.degree. F., and the liquid condensed on the coils is carried to the sump through a drain pipe where it is pumped to waste disposal through a flow meter. The process is capable of producing dried lumber with as little as 0% final moisture content, or the final moisture content can be predetermined by correlating empirical data on the density, amount, and moisture content of the lumber being dried from the amount of liquid passing through the flow meter.
REFERENCES:
patent: 2296546 (1942-09-01), Toney
patent: 2830382 (1958-04-01), Petersen
patent: 3018561 (1962-01-01), Wells
patent: 3574949 (1971-04-01), Farnsworth
patent: 3921309 (1974-08-01), Nakayashiki
patent: 4058906 (1977-11-01), Pagnozzi
patent: 4194296 (1980-03-01), Pagnozzi et al.
Camby John J.
Hobbs Marmaduke A.
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