US1541902A - Drier - Google Patents

Description

June! 16 1925.

H. IR. COLLINS DRIER Filed April 26. 1922 5 Sheets-Sheet 1 June 166y 1925.

H. R. COLLINS DRIER Filed April 26 1922 5 Sheets-Shea?I 2 S14/vanto@ H. R. CoLL|N5 June 16, 1925.

4 H. R. coLLuNs DRIER Filed April 26 5 Sheets-Sheet 3 'iwf l 5mm/mica H. R.COLL|N5 Jimfe 16, 1925.-

H. R. COLLJNS DRIER Filed April 26. 1922 5 Sheets-Sheet 4 @5% @VCM/mmf f Pam@ 02%,; @Kw4 June 16, 1925.

H. R. coLLlNs DRIER Filed Aprl 2e 5 sheets-sheet 5 nvemto'c H.R.COLLIN5 Patented June 161925.

HABBYRAYMONB COLLINS, or ALLENTOWN, rENNsYLvANu, AssIGNon 'ro rumma- Lamer:l COMPANY, a Conronn'rroN Damn.

QF PENNSYLVANIA.

Application led April 26, 1922. Serial No. 556,679.

To all whom z't may concern.:

Be it'known that I, HARRY R. CoLnINs, a citizen of the United States,` residln at Allentown, in the county of Lehigh, tatev 5 of Pennsylvania, have invented certain new and useful Improvements in Driers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art l to which it appertains to make and use the same.

This invention relates to driers .and involves more particularly the provision of an improved form of rotary drier such as is -l employed in preparing fuel for. firing-1n pulverized form. In order that fuel may be successfully burned when pulverized, the

moisture content should ordinarily be reduced to one per cent or less except in the case of lignite coal. Installations for preparing, introducingv and burning pulverized fuel therefore include, among the various apparatus for crushing, pulverizing, con-v veying and burning of the fuel, a drier fdr reducin the moisture content so that the fueliwil be adapted for use in firing it in pulverized form. Such driers are common-l ly of the rotary type.

In construction rotary driers of this character, it has been common to provide a cylindrical casing or shell mounted to rotate aboutan inclined longitudinal axis and extending through a furnace for supplying heat to the material in the casin to be dried, both ends of the icasing extendlng outside the furnace walls. The casing is mounted to rotate by means of bands or tires encircling lthe casing near each endwhlch are supported on rollers, and the casing has 'gear connections with driving means vfor rotating it to agitate the material fed to the casing which then passes downwardly through the casing by gravity to the `discharge end thereof.- The material is heatedf in its downward passageto the casing by means of the gases of combustion Vfrom the furnace which are caused lto circulate about that portion of the casing-within the furnace, about the discharge end of the casing and through the latter'in direct Contact with ,the material. The heating ases are carried from the furnace for circu ation about the discharge end of the casing, thence through casing and the drive yfor supplying heat to the Casin the casing by means of. a hood or heatin jacket surrounding the dischar e end o the casing and connected to the urnace by means of a breeching affording a comparatively shallow passage, separate rom the casing, through which the gases pass from the furnace to the hood. Between the furnace and the hood the casin is exposed to the air and this portion of the casing is utilized for the sup orting means or rotatable mounting for t e discharge end of the connections. YThe'external heatin effect of the gases of combustion is there ore limited to the portion of the casing within the furnace and its discharge end. The casing, moreover in ap-l paratus of this construction hereto ore employed in practice, has been fitted on its interior surface with longitudinally extending buckets orshelves for agitatin rial, the shelves being arranger? circumferentially around the inner surface and leavthe -mateing an openv central space throughout the casing for the passage of the heating gases therethrough in direct contact with the material within the casing.

The drier constituting the present invention is of the rotary type consisting of a cylindrical casing or shell which is mounted to rotate about a longitudinal axis, preferably in an inclined position from the inlet or feed end of the casng'to the discharge end thereof, and having appropriate means material fed therethrough. he heatin means for the casing are 'constructed an arranged in such manner that heat is applied to the exterior surface of the casing from its inlet end throughout to its discharge end.v Thus the material in the casing is subjected to heat substantially throughout its entire length both exteriorly and interiorly as distinguished from driers heretofore constructed'. having a considerable length of casing, the exterior surface of which is not reached by the heating gases,

to dry the 1,

and which, as a matter of fact, is I'exposed to the atmosphere that acts to cool the Casing along this -portion and thus counteract the effect of the heating gases passing through the casing the in et end thereof.

from the discharge to The heating means conveniently employed y in the drying apparatus ofthe present in-V vention 1s a urnace through which the casin or shell extends, the furnace preferably loeing one employing pulverized fuel and of the exterior surface of the casing may be subjected to the heating effect of the gases of 4combustion as indicated, means are provided for constraining the passage of the gases about the casing from the inlet or feed end thereof to the discharge end. In one form of construction, as described hereinafter, this is accomplished by providing the furnace with a horizontal wall or arch which divides it into a combustion chamber and a passage for the gases of combustion or flue situated above the combustion chamber and communicating with it,l and connected to the furnace in communication with the llue therein is a jacket or hood which surrounds or envelops the discharge end of the casing. The gases of combustion are constrained by the arch and the heating jacket to circulate about the casing from its inlet end to its discharge end, thence through the casing to its inlet end in direct contact with the material in the casing. Circulation of the gases in this manner is produced preferably by an exhauster located in the inlet end of the casing which serves also to produce an inward suction at the joints and cracks of the casing and associated parts' at its inlet end to 'prevent the escape of pulverized material to the atmosphere.

The casing is rotated by suitable driving means and is advantageously divided into a plurality of compartments by a series of longitudinally extending radial partitions which are preferably two in number, positioned at right angles to veach other and dividing the casing into four similar compartments. These partitions are spaced from the inlet end of the casing to provide a feed chamber intol which the pulverized material is introduced by feed devices consisting'of a hopper, spout and a feed sleeve. Each compartment is provided with a scoop, and these scoops operate by rotation of the casin to pick up the material in the feed cham er and introduce it into the respective compartments. The material received in the feed chamber lfrom the hopper and spout and` feed sleeve is pushed forwardly in the feed chamber in the path. of the compartment scoops by means of deiiector blades secured at the extreme inlet end of the casing. Situated in each of the casing com partments is a plurality of blades or buckets extending longitudinally of the casing and secured to the casing wall and to the radial partitions. The material scooped into each of the compartments is divided into a plumaioa rality of separate streams which slowly pass along the casing as the latter is rotatedv due to its inclination from the inlet 'to the discharge end thereof.V The matenal 1n each of these separate streams is kept in a con- `casing from the inner wall thereof to its axis and back again. Thus each particlel of the separate streams of material is subjected to the heat radiated through the casing wall and the direct drying action of the gases passing through the casing in contact with the material. The thorough distribution of the material in this way, combined with the more effective heat distribution in the manner described, not only accomplishes a more thorough dryingof the material with a less expenditure of heat, but the distribution of the material in the casing, during the drying action, in the manner described, results in the further advantage that there is a -balancingof the load to the extent that considerably less power is required to rotate the casing than that which is necessary Where the agitating devices or buckets are distributed circumferentially on the inner wall of the casing with a central open space through the latter as in prior devices.

Further features of the invention consist of the provision of seals of improved construction for sealing the opening between the casing and the furnace wall at the point near the inlet end of the casing where the latter projects through the wall, and a seal between the extreme end of the casing and the feed sleeve. These and other features of the invention will be brought out in the description hereinafter, in connection with the drawings, of the preferred form of drier construction.

The form ofthe invention at present preferred vis illustrated in the accompanying drawings, in which- Fig. 1 is a longitudinal section of the drier.

Fig. 2 is a top plan view,

Figs. 3 and 4 are sections on the lines 3-8 and 4 4 respectively, of Fig. l,

o Fig. 5 is an enlarged'detail section at the intermediate end of the drier casing,

Figs. 6, 7 and 11 are sections on the lines 66, 7-7 and 11-11 respectively, of Fig. 5,

Figs. 8f and 9 are sections on the lines 8 8 and 9-9 respectively, of Fig. 6, j

Fig. 10 is a section on the lines 10-10 of Fig. 7 and f' Fig. 12 is a transverse vertical section showing a modified construction of drier.

The drier consists essentially' of a tubular casing or shell 1 which is mounted to rotate on its longitudinal axis within a furnace 2, the casing extending through .the furnace at both its ends. .A The casingV is supported e in a position inclined downwardly from the front or inlet end for material to the Irear or discharge end thereof as shown inFig. 1, so that the material fed into the casing at the inlet end will travel through the casing to the discharge end as the casingis rotated.

The casing is supported at its `front or inlet end by means of a bearing permitting rotation of the casing which consists of rollers 3, journaled in brackets 1 on a support or pedestal and a tire ring 6` with which this end of the casing is fitted,the tire rim engaging the rollers 4. The rear or discharge end of the casing 'is rotatably supported by means cfa. spider 7 secured within this end of the casing, and a shaft Sheld within the spider, the shaft being journaled in a sectional bearing 9 on. a pedestal 10. A thrust collar 11 is arranged on the shaft betweenthe bear- ;ing and the spider, and the shaft is driven by-a worm wheel 12 mounted thereon which meshes with a worm on the worm shaft 13,

- driven in a manner to be presently described,

and -journaledj on a `suitable support or A pedestal 14:. When, therefore, power is applied to the worm shaft 13, this will be transmitted to the casing to cause its rotation through the worm wheel 12 and the shaft 11, the inlet end of the casing riding v on' the rollers 3,'and the discharge end being supported in the bearing 9. I

The furnace 2 for supplying the heat to the casing is built of any suitable refractory material as, for instance, brick, and it is/ supported externally by buck stays l5 ar# ranged at o posite sidesl of the furnace and connected a ove the-top of the furnace by -tie rods 16. The tie rods pass through the buckstays at their ends, and are engaged-by` nuts outside the buckstays, and between the latter and the nuts are coil springs 17 which are arranged to exercise a ylelding pressure on the buckstays toward the furnace-walls. The discharge end of the casing is enclosed by a heating jacket or hood 18 which surrounds or encloses the rear end of the casing in spaced relation therewith, and is connected tothe furnace 'in communication with the passage for the gases of combustion or Hue 18a situated above the combustion chamber 21 'of the.furnace. The jacket or hood 18 has a dischargev tube 19 at its extreme outer endthrough which the material assing through the casing is discharged t erefrom. Clean out'openings are provided in the Alower part of the jacket below the casing` which are normally closed by sliding doors 20.

lThe furnace may be arranged to utilize any character of fuel, in the present instance being designfed to burn pulverized fuel as, forexample, pulverized coal which is blown into the combustion chamber 21 through the rear wall of the `:furnace with the proper admixture of air by means of a burner 22 preferably of the induction type, as is usual. A wall or arch 23 separates the combustion chamber21 of the furnace from y the upper p'ortion thereof, the arch being spaced from the front wall of the furnace to provide a passageway for the gases of comv I bustion which are constrained to passupwardly over., the arch 23 through the pas-l sageway or flue 18a circulating about the casing 1, thenceinto the jacket or hood 18,a

circulating about the rear portion of the casing, and then through, the casing to the front. end thereof, this circulation of the gases being produced in a manner to be presently described. The furnace is provided with bottom doors 25 opening into the bottom of the combustion chamber byv e it may be removed by raking or hoeing o ut 'of the bottom doors.

In order to prevent the escape of heating gases from the furnace to the atmosphere lbetween the front ,wall ofthe furnace and the inlet end of the casing projecting therethrough, there is provided means for seal-v ing the space 'between the furnace wall and the casing which comprises a ring 26, se. vcured to the furnace wall by means of anchor bolts 27, a ring 28 mounted on the casing 1,- and a floatin or sealing ring 30 .carrying rollers 30a ri ing on the ring 28 (Fig. `5). The ring 26 consists of portions offsetwith respect to each other and connectedby an lntegral web, one of the p01*-, .tions-being secured to the furnace wall by means of the anchor bolts'and the other'portion` extending toward the casing or shell 1, but spaced therefrom` at the inner edge of the'ring. The ring 28, mounted on the casing, is secured thereto -in any convenient manner, and this ring extends alongside the shell spaced therefrom along a portion of its width. The floating or sealing ringY 30 is connected to the ring 26 and coacts with this 'ring and the ring 28 in sealing or closing the space between these rings. The ring 30 has radial perforated projections 31 through which pass screw bolts,` 3 2 from the ring 26. The screw bolts are axial to the openings and engage the ring 26. A plate or disc 33 is held over each perforation by the -bolt 32, and a nut 34 and a washer 35 are arranged between each plate and the ring 26. The rollers 30" on the ring 30 ride'upon thering'28 to reduce the friction between these parts. The inner edge similar compartments by means of longitudinal radial partitions 36, four partitions being provided in the present instance which divide the shell into four like compartments. The compartments of the casing are each supplied with material from the feed chamber at the forward or front end of the cas- `ing' by means of scoops 50, in a manner presently to be described, and the material therefore passes through the casing in a plurality of streams, each of which, due to the rotatio of the shell, is subjected to precisely tif/Same conditions of drying as all the ot ers. By making the partitions radial, the greatest possible radial movement is obtained and hence a maximum of agitation. The partitions extend from a point near the spider 7 to a point just beyond the furnace wall at the front end of the shell as shown in Fig. 5, and the partitions are slidably connected at the center of the shell to permit of theirexpansion and contraction. Referring particularly to Fig. I11, it will be noticed. that each partition is connected to the shell by means of angle plates 37, and the inner edge of each partition has riveted thereto an angle plate 38. Each of these angle plates has a portion which engages the partition extending at right angles to the partition on which the angle plate is riveted and this portion is slidably connected to the partition by means of clips 39, the clips loosely engaging the portion ofthe angle plate so that the partition may slide relative to the plate to which it is clipped. Secured to the partitions and to the interior of the shell are stirring plates or buckets 40 and, as showny in Fig. 11, these plates or buckets are situated midway between the ends of the partitions, each partition being provided with two buckets extending in opposite directions. This arrangement of radial partitions and buckets not only insures a thorough stirring or agitation of the material as it passes through the casing by which the material is more effectively and completely subjected to the heat within the casing and the drying cases passing therethrough, but by this means a more even distribution of the material within the casing is obtained with the result that less power is required to rotate the casing.

The forward ends of the partitions are spaced apartfrom the inlet end of the shell 1, as shown in Fig. 5, to provide a feed chamber, and the material to be dried is fed into this chamber from a hopper 41'throu`gh an inclined chute 42 extending from the hopper into the feed chamber. The hopper lthe casing from the with its chute is supported upon a feed sleeve 43 situated at the inlet end of the shell 1, the sleeve being mounted upon a bracket 44 on the pedestal 5, as before stated. The feed sleeve 43 projects into an opening in the end of the casing or shell 1, which opening is made somewhat larger than the feed sleeve in order to allow for lateral movement of the casing relative to the sleeve; For closing the opening between the casing and'sleeve while'perrnitting a certain amount of lateral movement of the casing in its rotation, a sealV is provided which consists of an angle ring 45 secured within the feed end of the shell, and a sealing ring 46 which is connected with the angle ring by means of screw bolts 47 that pass through openings in proiections or lugs on the sealing ring. Cover plates 48 are held by the screws 47 over the openings in the lugs, the screw bolts being engaged by nuts to clamp the cover plates in place, and spacing washers are arranged between the cover plates andthe angle rings. The inner edge of thesealing ring fits closely about the feed sleeve 43 and the ring carries rollers 49 which engage the outer surface of the feed sleeve to assist in supporting the shell.

For feeding the material to thev several compartments of the shell, there is provided a scoop 50 for each compartment, the scoops being secured to the partitions and to the wall of the casing; These scoops, as the casing rotates, scoop up the material fed into chute 42, and as the casing continues to rotate, the material slides down the inclined bottom 51 of the scoop into the compartment through which it is fed by gravity and by the rotation of the casing. In order that the material thus let into the feeding chamber may be pushed along the feed chamber to the path of the scoops 50, a plurality of deflectors 52 are provided, each of which is in the form of an angle plate consisting of two portions extending at an acute angle with respect to each other. One of these portions is secured to the ring 45, while the other inclines outwardly away from the ring into the feed chamber. The deflectors constitute in ef- .fect a spiral conveyor which acts to push the .material rearwardly of the casing and feed it to the scoops 50. The arrangement of the deilectors will depend upon the rotation of the shell 1 and the apices of the deflectors will preferablvfbe pointed in the direction in which the shell is arranged to rotate.

In order to induce circulation of the heating gases through the system` and to provide an effective seal for preventing the escape of the finely pulverized material during the operation of the drier, means are provided for setting up a circulation of gases which at the same time serve to reduce 7" the pressure in the casing' at vthe inlet end' vldean inward cracks. Such means 1s 1n the form of a blower or exhauster 51a which is connected to the outer end ofthe sleevey 43, the blower deliverin to a separator 52a to which it is connecte bmea'ns of a pipe 53. The exhauster for ower is driven by a suitable motor 54 connectedto the shaft of the ex` hauster by a belt as indicated in Figs. 1 and The chute 19 at the end of the hood or jacket 18 delivers the material discharged from the end of the casing to a screw conveyor indicated generally at 55, and this screw conveys the material from the chute to anelevator indicated generally at 56- by which it is 'carried tol suitable receptacles for storage or distribution. l

The separator 52 is connected by a pipe 59 with the casing of the screw conveyor 55 so that the pulverized fuel which has been `carried in suspension to the separator passes into the screw conveyor after it has. been separated from the air in ,which it was held in suspension. The elevator 56 is driven in any suitable manner and it is connected to the screw conveyor to drive the latter by the' pulley 'and by the mechanism indicated at 60.

The shell or casing 1 is driven ,by a motor 57 connected to a pulley 58 on the shaft 13, preferably by means of a silent chain sprocket.

As before noted, 4the furnace for supplying heat to the casing in the present instance is arranged for the burning of pul- Verized fuel, and this fuel` with the proper admixture of air, is delivered to the combustion chamber of the furnace by the burner 22. The .fuel is injected into the combustion chamber through the burner by means of a blower 61 connected to the burner and driven by a motor 62 throughthe belt and pulley connection indicated. Fuel is supplied to the burner from a hopper or receptacle 63l by means of a feeder indicated 4at 64. Suitable cleanout doors 24 are provided above the partition wall or arch 23, and 4addi-tional air inlet openings 66 are provided in the rear Wall of the combustion chamber as shown in Fig. ,4. Situated -between the exhauster 51a and the casing is a blast cap or damper 67 bywhich the draft or circulation of gases through the system is regulated. p V

In Fig. 12 there is shown an alternative construction, wherein the partition wall 67* between the combustion chamber and the drier casi and corresponding to the partition 23 Id? Fig. 1, ris provided with open- -ings 68. hrou h these openings heated gases pass into t e chamber in which the 'of the shell to itsdl nthrough the openings in shell of the drier.

t e jacket. The area of these openings is determined by the amount of fuel burned per of time in each size drier, and the emngs are arranged in the arched -roof o the combustion chamber, so that the direct action of the hot gases will not be immediately u on theshell of the drier at its lowest point, Ibut diverted to each side and around the shell, preventing direct impingement and possible damage to the shell at is lowest point.. It will be understood that the be modified tosuit the fuel burned, but, however constructetL-the arrangement will be such that thehot gases follow the surface 'scharge end, thence within the shell to the feed end thereof. The hot gases heat the 'material indirectly during the first part of their travel and af-y terwards directly thereby to provide a safeguard against ignition of the'material.'

. The combustion chamber in Fig. 12 has its inner walls entirely constructed of firebrick, forming an enclosed chamber. One of the objects of this construction is toy obtain the action of the radiant heat from the firerick after the walls have become thoroughly heated. action of the radiant heat Will yignite all ofthe volatile gases that may arise from the fuel in its process of combustion in the chamber before passingv the arch and end wall, thereby `overcoming 'heat losses and passage of smoke into the main body of furnace and to the chamber. This action will tend to reduce the quantity of fuel necessary for the drier' operation, after the walls have become thoroughly heated, promoting consequent economy. Suiicient air must be admitted' to the bottom of this chamber through proper clean out doors and air inlets to furnish the oxygen necessary for complete combustion.

1, A drier including a tubular casing` or shellwhich is rotatably mounted and is constructed and arranged to receive material to be dried at one end thereof and'to carry it to the other end of the casing for discharge, and a furnace' for supplying heat to dr the material in the casingV as it passes t erethrough, the furnace having a combustion chamber and a passage for the gases of combustion, and the shell being mounted to extend through said passage and to project outside the furnace at both ends thereof, an

extension casing connected to the furnace shape of the furnace will ilo which the discharge end of the shell is i housed, the passage and extension casing being constructed and arranged to constrain circulation of the gases ofA combustion about the exterior surface of thev shell from its feed end throughout to its discharge' end,

, shell which is rotatably mounted and -is constructed and arranged to receive material to be dried at one end thereof and to carry it to the other end of the casing for discharge,

and a furnace for supplying heat to the material in the casing as it passes therethrough,

the furnace having a combustion chamber, a gas flue, and a hood connected thereto at one end and communicating with the flue, and the casing being mounted to extend through the flue projecting outside the furnace at both ends thereof and into the hood at its discharge end, the ueand hood being constructed and arranged to constrain circulation of the gases of combustion about the exterior surface of the casing from its inlet end throughout to its discharge end, around the latter, thence through the casing toward the feed end thereof, and means for causing circulation of the hot gases, substantially as described.

3. A drier including a tubular casing or shell, devices for feeding material into the casing at the inlet end thereof and 'for receiving the material discharged from its outlet end, a furnace for supplying heat4 to the exterior surface of the casing, the casing extending through and projecting outside the furnace at both its ends, a rotatable mounting for the casing at its inlet end, and a mounting for the easing at its outlet end comprising a, shaft mounted in a bearing, means at this end of the casing by which the latter is centrally supported upon the shaft, and an extension housing communicating with the furnace and surrounding the outer end of the casing, substantially as described.

4. A drier including a tubular casing or shell, and a furnace for supplying heat'to the casing, the furnace havingy a combustion chamber and a passage' for the gases of combustion, and the casing being mounted to extend through the said passage and to project outside the furnace at both ends thereof, devices for feeding material to be dried to one end of the casing and for receiving the dried material discharged from the other end thereof, a rotatable mounting for the casing at its feed end, a shaft mounted in a bearing for supporting the casing at its discharge end, and an extension housing surrounding the discharge end of the casing which is connected to the furnace and communicates with the passage for the gases of combustion therein, substantially as described.

5. A drier including a tubular casing or shell, a furnace for supplying heat to the casing, the furnace having a combustion chamber and a passage for the gases of combustion, the casing being mounted to extend throu h the passage and to project outside the urnace at both ends thereof, and devices for feeding material to be dried to the casing at one end thereof and for receiving the dried material discharged at its other. end, the casing having at its discharge end a spider, a shaft upon which the discharge end of the casing is mounted by means of said spider, a tire at the feed end of the casing and rollers upon which said tire is supported, and means for rotating the casing, substantially as described.

6. A drier including a tubular casing or shell, and a furnace for heating the casing having a combustion chamber and a flue for the gases of combustion, devices for feeding material to the casing at one end thereof and for receiving the dried material discharged from the other end thereof, the casing being inclined downwardly from the feed to the discharge end thereof and extending through the furnace iue projecting outside the furnace at bo'th ends thereof, a rotatable mounting for the casing comprising a tire supported on rollers at the feed end thereof, a shaft at the discharge end thereof mounted in a bearing, a spider at this end of the casing upon which the latter is supported on the shaft, and a hood connected with the furnace, communicating with the iue and surrounding the discharge end of the casing, substantially as described.

7 ln a drier, a tubular casing or shell, means `for rotating the casing about its longitudinal axis, radial partitions dividing the casing into similar compartments extending longitudinally of the casing, and a slidable connection between the partitions at the center' of lthe casing to permit expansion and contraction of the partitions, substantially as described. j

8. In a drier, a tubular casing or shell, means for rotating the casing about its longitudinal axis, radial partitions dividing the casing into similar compartments -extending longitudinallyV of the casing, a slidable connection between the partitions at the center of the casing to permit expansion and contraction of the partitions, and means operative by rotation of the casing for feeding material to be dried to the several compartments, substantially as described.

9. In a drier, a tubular casing mounted to rotate about its longitudinal axis, radial partitions extending longitudinally of the casing and throughout its length and dividing it into a plurality of sector-shaped compartments extending uninterrup'tedly substantially from the inlet to the outlet of the casing, and means at the inlet end of each compartment for scooping material into such compartment, substantially as described. l

10. in a drier, a tubular casing mounted v 'to rotate about its longitudinal axis, parti- Y ,tions mounted radially i inlet to the'outlet of the casin ing uninterruptedly substantially from` the f mg material from the chamber tothe com-` .25

' means for feeding v ed gases from the furnace tions'te inating` short of the inlet end of inlet to s .outlet of the casing, the partithe cas' g to provide a feed chamber with Awhich all the compartments communicate,

means forV feeding material to the chamber, means at the several compartments for feedpartmen'ts, and means operative by rotation of the casing for advancing the material along the feedv chamber Vand toward the compartments.

12. In a drier, a tubular casing mounted to rotate'about its longitudinal axis, partitions mounted radially in the casing and forming sector-likev compartments extending -'fl substantially from the in- `unintnerruptedly let to the outlet ofthe casing, the partitions terminating'short of the inlet/end of th'ecasing to 'provide a feed chamber with which all the compartments communicate, material to the chamber, means at the several compartments for feeding material from the chamber to the compartments, and deiector blades situated at the end of the casing for pushing the material forwardly toward the compartments.

13. Ina drier, a tubularcasing, a furnace in which the casing is mounted to' rotate, the casing extending beyond the furnace at both ends, means for feeding material to be dried to one end of the casing, means for receiving the material at the other end, means for constraining the heatto circulate about the casing from the inlet end thereof .casing a plurality throughout to the discharge end, thence through the casing, the latter being divided into a plurality of longitudinal compartments extending uninterruptedlyl substantially from the inlet to the outlet of the of longitudinally extending buckets therein, andmeans at the inlet end of each compartment for feeding material to be dried thereto and for causing circulation of the hot as described.

14. In a drier including a tubular Casin mounted to rotate `about its ,longitudina to provide a feed chamber with gases, substantially axis and through which the material to be dried is passed, means for heating the casing, a plurality of radial partitions extending longitudinally of the casing, and dividing the casing substantially throughout its length into' compartments which extend uninterruptedly substantially from the inlet to the outlet of the casing, means for feeding material to each compartment, and' a plurality of buckets situated in each of the compartments, substantially as described.

15. In a drier including a .tubular casing mounted to rotate about itsv longitudinal axis and through which the material to be dried is passed, means for heating the casing, a plurality of radial partitions extending longitudinally of the casing substantially throughout its length and dividing the casing into compartments extending uninterruptedly substantially from theI inlet to' the outlet of the casing, means for feeding material to each compartment, and a plurality of buckets in each of the compartments extending 'longitudinally of the casing and secured on the scribed. l

16. VIn a drier,

partitions, substantially as dea tubular casing 'or shell and a furnace for supplying heat to the casing having a combustion chamber and a ue for gases of combustion, the casing being mounted 'to rotate and extending through said ue and projecting outsidethe furnace at both its ends, devices for feedin material to lthe casing at the inlet end thereof for material to be dried, said devices Aincluding a sleeve opening into the inlet end of the casing, a seal between the furnace wall and the casing, and a seal between the end of the casing and the sleeve, a conduit connecting said sleeve with a separator, and a blower for drawing olf dust in suspension at Vthe inlet end of the drier and feeding it to said separator, a feed screw at the discharge end of the casingand a conduit connecting the separator outlet with said feed screw for conducting material separated from the air to the discharge end of the drier, substantially as described.

17. In a drier, a tubular casing or shell and a furnace for -supplying heat to the casing having a combustion chamber and a llue Jfor the gases of combustion, the casing being mounted to rotate and extending through said flue projecting outside the furnace at both its ends, and a seal between the furnace wall and the 4casing comprising a ring secured to the furnace wall and surrounding the casing, a ring secured to the casing adjacent the first mentioned ring, and a sealing ring co-acting with the casing and furnace rings to maintain a tight fit and prevent the escape of hot gases from the combustion chamber, said sealing ring to thecasing wall and ring mounted at the end df the Vcasing and coacting with the sleeve, a plurality of cir-4 cumferential apertures in said ring, and fastening means passin through said apertures and into the en of the casing and having cover plates for closing the outer end of said apertures, substantially as ldescribed.

In testimony whereof I aiix my signature.

HARRY RAYMOND COLLINS.

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