US890944A - Dry-kiln. - Google Patents

Description

PATENTED JUNE 16, 1908.

- A. JQUPHUS.

DRY K-ILN.

APPLICATION FILED DEC. 9, 1907.

2 SHEETS-SHEET l.

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ANTON J. UIH US, Ol SEATTLE, WASHINGTON, ASSIGNOR TO THE AMERICAN WOOD EXTRACT OOlliPANY, O1 SEATTLE, WASHINGTO N, A CORPORATION OF WASHINGTON.

DRY-ICILN.

Specification of Letters Patent.

Patented June 16, 1,908.

Application filed December 9, 1907. Serial No. 405,810.

To all whom it may concern:

Be it known that I, ANToN J. Urnos, a citizen oi the United States, residing at Seattle, in the county of King and State of Washington, have invented certain new and useful Improvements in Dry-Kilns, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to dry-kilns; and while it may advantageously be employed in various services, it is especially intended for use in the drying of lumber and other away.

wood products.

The object of the invention is the improvement in the efficiency of apparatus of this type through the utilization of a readily controlled drying agent to its maximum extent and of so applying such agent that it will act directly upon the material being treated as Well as serving to maintain the dry-house at a uniformly high temperature; and whereby the drying is reflected with a minimum of deterioration such as from warping, checking or splitting, and at a relatively low cost.

With these and other ends in view, the invention consists in the novel construction, adaptation and combination of parts, will be hereinafter described and claimed.

In the drawings, Figure l is a central longitudinal vertical section of a dry-kiln embodying my invention and with the inner part of the disclosed side wall partly broken Fig. 2 is a plan view taken through 2--2 of Fig. 1. Figs. 3 and 4 are transverse scctionai views taken respectively through and -t-4 of Figs. 1 and 2.

The kiln structure is comprised of side walls 5 and 5, a top 6, a floor 7, a rear wall 8, a.-d, at the front, a hinged door 9. Each of these walis as well as the roof and floor are chambered to provide communicating flues,

brought into or removed from the kiln with a charge of lumber.

12 is 2. pi e line leading from a source of steam supp y and is rovided with one or more branches 12 W ich extend into the kiln-chamber. These branches are closed at their extremities, as by caps 12, but are foraminated interio'rly of the kiln so that the steam is emitted by multitudinous 'ets into the kiln chamber. 13 represents val ves for re ulating the admission of steam to said branc 1 pipes. Opening into the kiln chamber is a dischar e pipe 14 for conducting the exhaust steam TI'ODl this chamber, after the steam has acted u on a charge, to the aftersaid ilues in the ki 11 structure. These fiues com rise a longitudinal one 15 at or near the )ottom of the wall 5', into which the exhaust steam first enters from the pipe 14 thence it flows by cross-fines 15 extendin through the floor 7 to vertically arranged ilues 15 in the other side wall 5, wherefrom it is led by return flues 15 in the kiln top 6 to down1:low i'lues 15 in the wall 5, whence it escapes through a passage 15 to an uptake flue 15" discharging ordinarily into the atmosphere. Under certain conditions, however, as for recovering the more volatile products from resinous woods, the flue 15 would be connected with a suitable condenser or with a gasometer.

The end of pipe 14 entering the flue 15 is desirably located about centrally of the length of the kiln and intermediate the fines 15 in order that the steam discharge from the pipe may be baffled in its course sufiiciently to distribute the same among several i'lues 15 and to furthermore retard its flow to enable a portion of the steam' entering through a passage 15 into communicating fiues 15 and 15 in the kiln wall 8 which, in turn, connect by a (luct15 with the uptake flue 15.

At the junction of the fines 15 with 15 is a'longitudinal assage 15 connecting them together and li 'ewise with the flue 15* to es tablish a flow therebetween to e ualize pressures in each. The transverse i ues are desirably formed with their bottoms sloping so that the condensation which may occur can be collected and drawn off by pipes such as 16.

Ventilating pipes such as 17. and 17' are respectively rovided at the lower and upper parts of the kiln chamber for the intake and egress of air which is oftentimes employed in the drying processes and are severally rovided with removable caps 17 or'equiva ent obturating devices, such as valves.

14 is an outlet to the pipe '14 whereby connection is made to a condenser instead of utilizing, as before explained, the steam within the kiln Walls, and to such ends valves 18 and 18' are provided to control the direction of the flow. Where it isdeterrnined to divert the exhaust steam from the kilnfiues, it is obvious that the flue-spaces of the wall will serve to render the latter .poori conductors of heat, and the loss thereof radiation would be less than if solid.

The door 9 is arranged with a acking strip, or gasket, 9 about its edges, w il'fe the door itself should be lined with asbestos bran equivalent heat non-conducting material. 3

The charge of lumber, shinglesflath or othermill products which is to be dried, is loaded upon acar in such a mannerithat kiln to immediately act upon the charge which, in being subjected to a high temperature, affects the same to cause the exudation of its contained liquids by a sweating process, as it were, and also such of the solid com- 'ponents thereof as would be rendered into fluids by the action of the prevailing heat.

Such exuded substances are to an extent taken up by the steam and conveyed therewith, in the earliest portion of the'drying, through the outlet 14 to a condenser for separating the foreign volatilized substances from the steam. The residue of the exuded substances, that is, the less volatile, gravitates to the floor of the chamber whence it can be drawn on by the pipes 16. After thus continuin the process for a time dependent upon tie character of the wood being treated, or until the more volatile of the exudations have been removed, thecurrent of the discharge steam is caused to flow into and through the fiues of the kiln structure and thus continued until the drying of the charge is completed, or nearly so, when the steam may be entirely out ofl'.

The ventilating pipes 17 and 17 are respectively employe to admit dry air into the kiln and liberate the same without the kiln the charge.

superheated steam is.

in a moist condition and when the drying of the charge has been nearly completed through the direct action of the steam upon The air in being allowed to flow through the previously heated kiln is capable of completing the drying operations through its capacity to absorb heat and moisture.

Among the advantages inherent to the present invention isthe rapidity with which the drying-of lumber may be attained, thus accomplishing by a relatively small kiln, .by a repetition of drying rocesses' upon successive charges, the wor which has hitherto been "subjected for longer periods in other and larger types of kilns.

Mill products which are dried in the de-' 1'. The combination with a dry-kiln pro- I vided with communicating flues in its walls, a pipe leading from a source of steam supply and extending mto'the chamber, air mlet and outlet pipes making communication with the interior of-the chamber and the atmosphere eXteriorly of the kiln, and means to regulate the flow of air through such last named pipes,

of a pipe conduit for discharging the steam from the kiln chamber into said flues.

2. The combination with a dry-kiln pro-- vided with communicating flues in its top,

bottom and vertical walls, a pipe leading from a source of steam supply and extending into the chamber, air inlet and outlet pipes making communication between the interior of the chamber and the atmosphere exteri- 3. The combination with a dry-kiln pro-- vided with communicating flues in its walls, and a pipe leading from a source of steam supply and extending into the chamber and provided with perforations within such chamber, of a pipe conduit for discharging the steam from the kilncharnber into said Hues. -l. The combination with a dry-kiln provided with communicating flues in its walls, and a pipe leading from a source of steam supply and extending into the chamber and provided with perforations within such chamber, of apipe conduit for discharging the steam from the kiln-chamber into said flues, and means whereby such flow of steam may be discharged without entering said from a source of steam supply and extending into the chamber, of a pipe conduit for discharging the steam from the kiln chamber regulate the flow of air through such last named pipes,/of a pipe conduit for discharging the steam from the kiln chamber into said ilucs, and means whereby such flow of steam may be discharged without enter1ng sa1d flues.

vided with communicating flues in its top, bottom and vertical walls, a pipe leading from a source of steam supplyand extending into the chamber and provided with perforations within such chamber, air inlet and outlet pipes making communication between the interior of the chamber and the atmosphere cxtcriorly of the kiln, and means to regulate 7. The combination with a dry-kiln prothe flow of air through such last named pipes, of a pipe conduit for discharging thesteam from the kiln chamber into said flues, and a valve for regulating theflow of steam through said conduit pipe.

-8. The combination with a dry-kiln provided with communicating flues in its top, bottom and vertical walls, a pipe leading from a source of steam supply and extending into the chamber and provided with perforations within such chamber, air inlet and outlet pipes making communication between the interior of the chamber and the atmosphere exteriorly of the kiln, and means to regulate the flow of air through such last named pipes, of a pipe conduit for discharging the steam from the kiln chamber into said ilues, a valve for regulating the flow of the steam through said conduit pipe, and

tering said flues. t In testimony whereof I aflix my signature in presence of two witnesses.

ANTON J. UPIIUS. Witnesses:

N. TALLENTIRE, HORACE BARNES.

means whereby the flow of steam may be discharged without en-.

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