High velocity running web dryer having hot air supply means

Details High velocity running web dryer having hot air supply means High velocity running web dryer having hot air supply means

1989-04-24

1990-07-31

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

432 59, 431 62, F26B 1300

Patent

active

049440985

ABSTRACT:
A high velocity web dryer which has a series of upper and lower air bars for floatingly suspending a running web as the web moves through the dryer. A hot air supplying system provides hot air to the bars for drying the web. The system includes a gas fired burner and a source of combustion air for the burner. A valve control is provided for controlling the admission of combustion air to the gas fired burner, and includes a movable valve for controllably admitting combustion air to the burner. The said valve control includes an initial air admitting valve for providing initial air through the valve control prior to partial opening of the valve control, to thereby provide a relatively smooth and excessive surge-free supply of air to the burner, whereby a stable air supply system in provided without oxygen starvation and without blowing out a flame of the burner. The initial air admitting valve is so sized so as to satisfy the pilot and low fire air requirements in a valve control fully closed position, and to insure proper air/gas ratio for stoichiometry combustion and minimize the pressure release and rush of air as the valve control begins to open.

REFERENCES:
patent: 2464698 (1949-03-01), Logan
patent: 3739491 (1973-06-01), Creapo et al.
patent: 4116620 (1978-09-01), Stibbe
patent: 4343769 (1982-08-01), Henkelmann

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