US740607A - Drier. - Google Patents

Description

10.740.607. Y PATNTBD 0011.6, 190s.

J. E. TU N Y.

DB1 I SSSSSSSSSSSSSS NSM/'40,601 RATBNTED 00T. s, isos.

- an n. Turman Y mush.. P'BLIGATIGK EIEBD JUNE 13, 1903. H MODEL. K 2 SHEETS-SHEETS.

y MA1- TV ks.

Patented October 6,' 190.

PATENT Qrricn.

Jol-1N n. TURNEY, or LoU1svILtE,nENTucKY.

omi-2R.y

SPECXFICATION forming partof Letters Patent No. 740,607, dated October 6, 1903.

Y Application filed June 13, 1903.

To d/ZZ whom it may concern/f Be it known that I, J OHN E. TRNEY, a sub-V ing is a specification, reference being had to the accompanying drawings, forming'a part thereof.

The general purpose ot this invention is to provide an improved drier for such material as may be delivered to the drier in such condition as to be handled conveniently-as, for example, in the condition. of a Wet or moist meal.

The specific purpose of the invention is to employ both direct and secondary heat-that is, to dry the material both by heat radiated from a surface heated by the products of com bustion and also to expose the meal directly to the products of combustion for further drying-combining thereby the advantages of both direct and v indirect drying, as

these two means or methods of drying are commonly designated.

lt consists in the structure and features of` construction set out in the claims.

In the drawings, Figure l isan axial section of my improved drier. tion at the line 2 2 on Fig. l. tionat the line 3 3 on Fig. l.A

My improved drier comprises a cylinder A, which is encompassed by an annular 'gear B and supported in a cradle@ on antifrictionrolls C and provided with means for rotating it in such cradle, consisting of the pinion D, meshed with the annular gear B and provided with any suitable means for rotating them to thus roll the cylinder in its cradle. This cylinder has extending longitudinally from end to end Within it a circular series of tubes E E Fatto., which are. rigidly secured to the cylinder at short intervals throughout its circumference and constitute lifts or iightsL-z'. c., means for lifting the pulverulent material which may be discharged into the. cylinder for drying as the cylinder rotates, such material being delivered in a shower from the several tubes operating as lifts as they successively reach a sufliciently high point to cause the material to fall from them to the bottom of the cylinder. To pre- Fig. 2 is a sec-A Fig. 3 is a sec-V Serial No. ll-,3 61. (No model.)

' vent such material from becoming lodged and retained between the tubesand the cylinder wall at the back side of said tubes, l complete the lifts or ledges which the tubes constitute by means of angle-irons AF F F, dac., bolted to the cylinder-wall ju st above and back of each tube, so that the horizontal or radially-extended lip of the angle-iron constitutes a shelf, which is continued inthe upper carrying-surface of the tube to which such lip extends. The cylinder A at its opposite ends extends into two iiXed heads, named for distinction, respectively, the receiving-head. and the discharge-head. l The discharge-head G consists merely of a rigid preferably castiron structure, having a suitable cavity with cylindrical opening at one side into which the discharge end of the cylinder protrudesy for'delivering the dried material which falls into the discharge-throat G',in which any suitable conveying means, as the screw H, may opcrate to carry away the dry material.

Preferably'the tubes E are supported at the discharge end by a spacing-ring FX, carried -by flat ironstraps Aor brackets E2, which are bolted tothe cylinder and extend off a short distance into the discharge-head for supporting the spacing-ring, as seen in Fig. l.

The cylinder at the receiving end has rigid with it, so as to revolve with it, an annular diaphragm, which is in the form o f a hollow annular head J, which constitutes a vestibule 'chamber for the tubes E, whose ends are let vthrough thev inner wall of said annular head, nso that they lead from its cavity. The'outer wall of the annular head J has an annular d opening iJ which faces and registers with the phragm K protrudes into the annular opening J through the outer wall of the hollow head J to make a suitably-close joint at the outer circumference of said opening, and a flange lo at the inner circumference of said annular diaphragm K telescopes with a corresponding iiange j' at the inner circumference of the diaphragm or hollow annular head J.

Through the central opening of the annular diaphragm K' a funnelL from the central opening of the cylinder leads up to the top of the main cavity of the stationary head K and loo there communicates with the vapor-discharge pipe M. The stationary head K is connected at the outer side, by means of a pipe N, with the discharge-passage of a furnace, which is not shown, but which should preferably be adapted for coal, coke, oil, or other fuel which may be perfectly consumed, so that the products of combustion constitute clear gas, such intensely-heated gas being conducted by way of the fixed head K around the funn el L, through the apertures 7610 7010 7010, &c., of the diaphragm K into the annular hollow head J, and thence directly into the tubes E. The material to be dried is fed in from a hopper P through a horizontal feed-pipe PQ-which, crossing the main cavity of the head K, opens into the side of the funnel L, near the bottom of that funnel. A spiral screw conveyer Q operates in the pipe P to conduct the material positively from the bottom of the hopper for discharge at the lower part of the funnel L, by which it is delivered into the cylinder through the central opening in the hollow head J.

rlhe operation of this structure is such that as the material to be dried is fed in by the screw conveyer it falls upon the heated tubes E and is carried up by the rotation of the cylinder and showered down across the open cen tral space in which the heated products of combustion, having first passed through the pipes B the whole length of the cylinder and heated said pipes, are, by the draft introduced to the final passage M, drawn back through said open central space to encounter the material which is being lifted and showered therethrough, as described. combustion having thus first heated the tubes E, so that they operate by radiation to heat the central portion of the cylinder and by direct conduction to heat and dry the material, which is constantly and repeatedly being lodged upon them as the cylinder revolves and showers it down, afterward operate directly in their return course through the open center of the cylinder upon the material .showered therethrough to further effect the drying process.

I t will be noticed that in this process the gaseous products of combustion from the furnace'pass through the whole length of the cylinder within the pipes E, secluded from the moisture of the material which is to be dried,so

that these products of combustion emerge from the pipes E at the discharge end of thev cylinderin a dry condition, and there starting on their return course meet the material which is to be dri-ed at its driest stage, because it has already passed through the whole length of the cylinder and is at the point of discharge.l

The driest gases thus meet the driest material and are in a condition to more completely dry that material because they have no moisture to give to it and may take some additional moisture from it. lt is to be noticed also that the wet material, at its entrance into the cylinder, encounters the hot pipes P at their The gases of4 `hottest` point, because at the point at which they are exposed to the gases of combustion just emerging from the furnace. The wettest material, therefore, is in condition best protected by its moisture from the danger of burning when it falls upon the very hot pipes, and these pipes by their extreme heat tend most rapidly to drive o the moisture, and the largest quantity of moist ure is thus driven off at the very entrance to the final vapordischarge pipe M, and so passes immediately out without therisk of encountering any material in condition to reabsorb it or any drier gaseous currents which might become moisture laden from it.

It will be further noticed that any very light and dry material which by reason of its extreme lightness and dryness may be carried up with the outgoing draft through the pipe M is in such position that it if may be arrested or held in suspension in its upward course until it can be precipitated it will fall back directly into the incoming current of wet material and be reabsorbed and intermingled therewith and carried on through the drying process and that thereby all loss which would otherwise occur by reason of such light material being carried off by the escaping gases is prevented.

It will be evident that it is merelyconvenient but not necessary that the annular diaphragm through which the tubes E lead toward the receiving-head should be in the form of an annular chambered head J, as illustrated, the purpose to be effected calling only for a means of confining the communication of the tubes E to the portion of the cavity of the fixed receiving-head K into which the products of combustion from the furnace are admitted and means of confining to thecentral portion of the cylinder within the circular group of tubes E the communication of the fixed duct, which leads to the vapor-discharge pipe M. Any mechanic would readily modify or transpose the elements of the structure so that the annular diaphragm in the cylinder which is penetrated by the receiving end of the tubes would not of itself present the form of a hollow annular head, and I do not limit myself to this specific form, though for certain purposes it is desirable and is made the subjectof a specific claim.

I claiml. A drier comprising a horizontal cylinder having a circular series of tubes extending longitudinally through it in position to constitute lifts or flights for the material to be dried; fixed receiving and discharge heads with which such cylinder and said tubes communicate at the ends; means for supporting and rotating the cylinder, the receiving-head being partitioned to'separate an annular portion from a central-portion, the annular portion communicating with .the tubes, and the central portion communicating with the cylinder within the series of tubes; an inlet for a heating medium leading into IIO said annular portion, and a vapor-discharge throat leading from said centralportion across the annular portion, and a iinal vapor-discharge pipe communicating with such throat.

2. A drier comprisinga horizontal cylinder having a circular series of tubes extending longitudinally and arranged circumferentially within it; fixed chambers with which the cylinder and its tubes communicate at opposite ends, one being areceiving-chamber and the other a discharge-chamber for the material to be dried; means for .supporting and rotating the cylinder with its ends in communication with said chambers respectively, the receiving-charnber being partitioned to form a passage leading from the upper side and opening centrally toward the cylinder; a final vapor-discharge pipe leading from said passage at the upper side; an inlet for a heating medium leading into said receiving chamber; a partition or diaphragm extending from the margin of the central opening of said vapor-discharge passage to the tubes, whereby said heating medium is directed into the tubes, and means for conducting the material to be dried across the outer portion of -the cavity of said receivingchamber into said dischargapassage.

3. A drier comprising ahorizontal cylinder having a series of tubes extending longitudinally and arranged circumferentially within it; xed heads comprising chambers with which the cylinder and its tubes communicate at the receiving and discharge ends respectively, the cylinder having at its receiving end an annular chamber into which the tubes open, said chamber being open at the side toward the receiving-head, said head having partitioned oii from the remainder of its cavity a passage registering with the inner circumference of said annular chamber and opening therethrough into the cylinder, such passage extending from such central opening across the cavity of the receiving-head ;v a vapor-discharge pipe leading from such passage,

and an inlet for a drying medium' into the re.

ceiving -chamber outside said partitioned passage, whereby. such medium is directed through the annular chamber into the tubes'.

4L. A drier comprising a horizontal cylinder having a series of tubes extending longitudinally and arranged circumferentially within it; means for supporting and rotating the cylinder;l iixed heads having chambers with which the cylinder and its tubes communicate at the receiving and discharging ends respectively, the cylinder having at the receiving end a hollow annular head through whose inner wall the ends of the tubes lead,

and whose outer wall is open for communica tion with the fixed head, said head having a diaphragm facing said annular head of the cylinder and apertured for communication with the cavity thereof, and having an annnlar flange which telescopes with the inner margin of said annular head; a passage opening through said diaphragm within said iiange and extending therefrom acrossv the cavity i of the head to the circumference thereof; a

vapor-discharge pipe communicating with it at the circumference, and an inlet into the iixed head for adrying medium outside said passage. f

5. A drier comprising a horizontal cylinder having a series of tubes extendinglongitudinally and arranged circumferentially within it; means for supporting and rotating the cylinder; fixed heads having chambers with which the cylinder and its tubes communicate at the receiving and discharge ends respectively; an annular diaphragm at the receiving end of the cylinder through which the tubes lead; a passage partitioned in the iixed head leading from the inner margin of' said annular diaphragm through the cavity of the iixed head to the outside thereof, and a vapor-discharge pipe connecting with it; an inlet into the cavity of the fixed head outside said partitioned passage for a drying medium, and a conduit leading from outside the head across the outer portion of its cavity into said partitioned passage; wherebythe material to be dried may be introduced through said passage into the cylinder within the circumferential series of tubes, and the drying medium may be introduced around said passage into the tubes.

In testimony whereoi:` I have hereunto set my hand, in the presence'of two witnesses, at Louisville, Kentucky, this 8th day of June, A. D. 1903.

JOHN E. TURNEY.

In presence of-A IRvrN DUGAN, C. W. LONG;

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