Method of and apparatus for heating circulating air in drying eq

Details Method of and apparatus for heating circulating air in drying eq Method of and apparatus for heating circulating air in drying eq

1974-08-22

1976-02-10

Sprague, Kenneth W.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 54, 34 86, 34219, 34242, 432 72, 23277C, F26B 300

Patent

active

039369510

ABSTRACT:
In a method of and apparatus for heating circulating air, particularly circulating air in drying equipment, a portion of the circulating air is exhausted from the drying equipment and conveyed to a combustion chamber for the thermal incineration therein. Prior to entry into the combustion chamber, the exhaust portion of the circulating air is preheated by a transfer of heat with oxidyzed gases produced in the combustion chamber. Thereupon, an outlet channel conveys all or part of still-heated incinerated gases either directly to the remainder of the circulating air in the drying chamber, or indirectly to an air-lock, or alternatively to a heat exchanger to heat the remaining circulating air in the drying chamber. An intake and exhaust channel communicates with the outlet channel for allowing pollution-free air to enter the drying equipment to replace the portion of heated oxidyzed gases which has been discharged and to mix together with a portion of the heated incinerated gases so as to preheat the mixture thereby prior to entry into the drying chamber. Temperature sensor and flow control means cooperate so as to permit choice in selection of the path by which the exhausted portion of circulating air travels prior to entry into the combustion chamber through a preheat exchanger or by-pass.

REFERENCES:
patent: 2795054 (1957-06-01), Bowen
patent: 2898201 (1959-08-01), Hayes
patent: 3486841 (1969-12-01), Betz
patent: 3604824 (1971-09-01), Hardison
patent: 3752642 (1973-08-01), Early et al.

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