US1734850A

US1734850A - Dry kiln

Info

Publication number: US1734850A
Authority: US
Publication date: 1929-11-05
Anticipated expiration: 1946-11-05

Description

Nov. 5, 1929. F. M. CREIGHTONET AL DRY KILN Filed April 13, 1926 2 Sheets-Sheet l 3 J m n w.

1929 F. M. CREIGHTON ET AL 1,734,850

7 DRY KILN Filed April 13, 1926 2 Sheets-Sheet 2 Patented Nov. 5, 1929 UNITED STATES PATENT OFFICE FRANK M. GREIGHTON, OF AMERICUS, GEORGIA, AND WILLIAM E. GRAY, OF MEMPHIS,

TENNESSEE, ASSIGNORS 'lO MOORE DRY KILN COMPANY, OF JACKSONVILLE, FLOR- IDA, A CORPORATION OF FLORIDA DRY KILN Application filed April 13,

Our invention relates to an improvement in dry kilns, and more particularly of the socalled charge kiln type.

The fundamental feature of this invention is the attainment of the uniformity of heat and humidity throughout the entire kiln. This is attained by the perfect control of the elements or factors, such as heat, humidity, and circulatory movement of the air of the kiln, that contribute to bring about this uniformity.

Our results are obtained by conditioning the air in the kiln by properly heating, humidifying and circulating and recirculating the air in the kiln uniformly throughout the entire interior of the kiln without admitting fresh air from the outside. As a result, the air in the kiln is brought to the required condition for the attainment of these results in a relatively short space of time after the operation of the kiln is started, thus appreciably reducing the time required for the curing of the contents of the kiln. All of this is accomplished by the use of comparatively simple.

mechanism.

The means for accomplishing our objects include a closed kiln in which the material under treatment is placed, means for heating and means for humidifying the air confined within the kiln, and means for circulating and re-circulating the conditioned air by simultaneously withdrawing it from the ends of the kiln, and re-heating it, and returning it back into the lower portion of the kiln in the region of the center, whence it rises and re-circulates in countercurrents at the top, being again withdrawn at the opposite ends and re-circulated as before in continuous cycles, with the attendant result that an approximately uniform temperature and uniform humidity is maintained throughout the entire interior of the kiln, and until the contents shall have been cured and is ready to be removed from the kiln.

In the accompanying drawings:

Fig. 1 is a vertical longitudinal section;

Fig. 2 is a horizontal section;

Fig. 3 is an enlarged transverse section on the line 3-3 of Fig. 1, looking in the direction of the arrow.

1926. Serial No. 101,762.

The kiln illustrated is a charge kiln. By charge kiln is meant one in which the material is placed in the kiln and subjected to the curing process for the required length of time, and then is bodily removed.

The number 1 represents the kiln. This may have doors 2, at one or both ends, and it has ventilators 3 of any approved type in the roof.

The numeral 4 represents heating-coils. These may be arranged in any approved manner, and are located at the bottom of the kiln usually beneath the rails 5. Spray pipes 6 may be arranged wherever desired to meet the requirements. In the illustrated form of the kiln there are shown four such pipes extending longitudinally of the kiln, two at the top spraying downwardly, and two at some point near the bottom spraying upwardly. These sprays are regulated by hand or control regulators (not shown). These pipes are at opposite sides of the kiln.

At opposite ends of the kiln are intake hoppers 7. These are preferably covered over by screens 8, and the conditioned air of the kiln is drawn in opposite directions downwardly into these air inlets or hoppers as indicated by the arrows. From these air intakes or hoppers, an air conduit or conduits 9 extend inwardly in opposite directions, or toward the center preferably so that their discharge ends 10 extend far enough beyond each other to insure a discharge of their contents in opposite directions into the kiln, and sufficiently separated to prevent the two discharges from materially influencing each other. The air in these conduits is moved forward toward the center and accelerated by any suitable mechanism, as for instance jets 11 of steam or compressed air, or fans if desired, two of these being shown in each of the two conduits illustrated. These jets are supplied by a pipe 12 controlled by some form of simultaneous control which may be in the form of a hand-valve or regulator control 13.

By this arrangement of mechanical means, such as air conduit or conduits 9, which withdraw the air of the kiln simultaneously from opposite points and return it to and disly opposite directions to points beyond the ends of each other, and discharging a drying medium in approximately opposite directions.

9. A charge kiln having a longitudinal drying chamber, and conduits communicating with said chamber and Withdrawing the drying media from the region of the opposite ends, each of said conduits extending beyond the center and discharging said drying media.

10. A charge kiln having a longitudinal drying chamber, and conduits communicating With said chamber and Withdrawing the drying media from the region of the opposite ends, each of said conduits conveying said drying media beyond the center and dis charging in the direction of the opposite end from Which said conduit extended.

11. A charge kiln comprising an elongated drying chamber having doors at the opposite ends thereof, hoppers extending transversely of the drying chamber in the regions or" the doors, and conduits communicating with said hoppers and extending to and discharging in intermediate portions of the chamber.

In testimony whereof We aifix our signatures.

FRANK M. CREIGHTON. WILLIAM E. GRAY.