US1072186A - Rotary drier. - Google Patents

Description

C. B. SMITH.

ROTARY DRIER.

APPLICATION FILED 00T. 2B, 1912.

l,0'72,1 86. Patented Sept. 2, 1913.

Z SHEETS-BHEET l.

C. B. SMITH.

ROTARY DRIER.

APPLIoATIoN FILED oonzs, 1912.

1,072,1 86, 1 Patnted sept. 2, 1913.

2 SHEETS*SEBBT 2.

Zisjzamiy tion has PATENT' @hhlm apecicetion of Lettera Patent.

Patented sept. e, i913.

.application filed october 2d, 19m. aerial No. 7,208.

To all wh-om t may concern Be it known that l, (bien. Bass SMITH, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Uhio, have invented certain new and. useful improvements in Rotary Driers, of which the following is a specification..

My invention relates to the type of driers that are used for drying granu ated or pulverized material, such as sand or cement, wherein the material to, be treated is fed into one end of' an inclined, rotating cylinder and discharged at the other end. ln the travel of the material through the cylinder it is cascaded and agitated, permitting hot1 air from a heating medium to come 1n contact with, and impregnato the. mass and thereby eliminate the moisture and thoroughly dry the material.

The objects of the invention are to provide a cylinder so constructed that the greatest quantity of heat is imparted to the material at the primary stage; the increasing of the heat distributin surface throu hout the entire length of te cylinder an" at ythe same time (providing the means for bringing the heate air fromthe furnace into direct contact with the material in a most advantageous manner, thereb enhancinor the etiiciency of the drier by utilizing the heat so that the greatest benefit is obtained therefrom. By this construction it is possible to economize in the size of-drier wlthout decreasil the capacity, and at the same time obtain etter results with less time required,

by the emplo ing of a vast amount of the t yat in former drier construceen wasted.

In my invention I rovide at the feed. end of the drier` an anni iary heater ordonble cylinder so .arranged that the mass of materlal, pregnant with moisture, is separated and subjected immediately to the direct heat from the furnace and to the heat imparted from the combined areas of the two cylinheat ener ders, thereby. giving. to the. material the greatest volume of heat atthe time when it contains the most moisture. From this rimarygtreatment the mxateriall passes into what mav be called` a secondary" orton of the 031m er which le provided w1 h a series c of lifting blades containing chambers in open communication with the furnace, whereby the two sides of the blades are heated to substantially the same de e as the casing, thus increasing the heat radidting area and creating a greater eiiiciency from the heat, by retaining an even temperature throughout the entire cylinder.

The invention also includes the providing of a series of longitudinal, radial, erforated yartitions that divide the interior of co artments, each of which is provided with thel improved blades which co-act with the said partitions for cascading and agitatin the material.

`he embodiment of my invention is illustrated in the drawings forming a part of this specification in which- Figure l. is a longitudinal view of the drier and appurtenances, with the furnace and a portion of the `cylinder in horizontal, vertica section. Fig. 2. is an enlar ed crosssection on line 2-2 of Fi 1` and i 3. is a like view on line 3-3 o Fig. l. Fig. 4 is a sectional view of one of the lifting blades on line 4-4 of Fig. 5. Fig. 5. is a fragmentary view of one of the said blades. Fig. 6. is a fragmentary view of the cylinder showing the perforated partitions. Fig. 7. is an enla d Sectio al vlew on line 7--7 of Fig. 6. i 8 an 9 are fragmentary views showinga 'fting blade in juxtaposition to one of the artitions.

Similar c aracters of reference desi ate similar parts in the drawings and specification.

In the construction of the improved drier the ordinary furnace is used and the cylinder is mounted and rotated in anv manner well known to those familiar with this art. While the casing of the cylinder 1 is preferably continuous and of the same diameter throughout its entiret from the feed end to t-he discharge terminal, to facilitate the explanation it will be referred to in sections. I construct the feed end of the casing for a certain predetermined distance, wlth an, outer shell 1n of light gage sheet metal and a lining sheet 1" of heavier gage and perforated as shown. Within the porthe c inder into a number of longitudinal.

i to ail driers o-f this type.

'close contact with the tion of the cylinder thus formed and concentric therewit-h, is an auxiliary cylinder 1 provided with a jacket 1d, forming an annular chamber 1 The chamberle is in open connection with the furnace chamber 2, through a series of tubes 1g. The heat from the chamber 2 is :drawn through the tubes 1g into the cham-y .bcr le and forward through the interlor of the thin outer shell la allows a higher del gree of heat to penetrate to the interior, and

the combination of the two shells gives strength and durability to this section of the casing. 'In this part of the cylinder the lifting blades are dispensed with, the material being agitated by-rolling over 0n itself in two concentric shells, the temperature of the heat being regulated according to the material to be treated. If

the material should be of such a consistency that an extremely high degree of heat is desirable, which would intime burn that por- I tion of the cylinder directly over the fire ondly that o box, the entire cylinder is not rendered useless but can readily be repaired by substituting a new head section to conform to the unimpaired portion of the cylinder. It being feasible toattach the head portion of the remainder of the cylinder 'just beyond the fire zone.

Now proceeding to the construction of .the cylinder, for what may be called, for convenience, the secondary treatment of the materlal, the v cylinder 1,A forwardv of the -ire zonecis provided with a series-of lifting blades 4, the particular construction .of

which will lpresently be described, these.

blades are attached to the interior of the shell, extend longitudinally therein and, for.

the purpose of obtainingthe best results they are equally spaced circumferentially.

The construction ofthe 'lifting blades is such that they perform a three fold function in the efficiency of the drier, first the cascading and agitating the material during its con-` tinuous passa e through the cylinder, secact-in as heat distributers auxiliary to'` the s ell of the cylinder and thirdly that'of providing air ducts from the furnace to the interior of the cylinder, keeping the blades at a temperature that will facilitate the drying and at the sameA time admitting heated air into the cylinder throughout its length, and co-acting with closed at the head end 1f.

i juxtaposition Locales the forced draft to kee through the cylinder a ove the point of the air traveling saturation and always in condition to absorb moisture.`

rllhe construction ofthe lifting blades is best shown in Figs. 4 and 5. To facilitate the manufacturing and assembling, the blades are made in sections or units, each of which is provided with a angefln for attachment to the shell of the cylinder. An

air chamber 4b is provided inthe body of l the blade and has one or more ports 4 opening into the cylinder. The ports 4* are protected by hoods 4d.

While in the construction of a cylinder as above described the drying i roperties are raised to a high degree of per ection, l propose to furtherincrease the drying capacity by a series of perforated partitions 5 placed vlongitudinally in the cylinder and dividing said cyllnder into a series of compartments 5a. Each of said compartments contains one of the lifting blades 4. By the use of'these partitions material is divided, and in the rotation of thecylin'der a certain amount of said material is continually escaping from one compartment to another through the perforations, and while in suspension it is subjected to the actionr of the heated air entering at the lower part of the cylinder, andrising through the perforations in the plates. It will be lseen that by the coc-'action of the lifting blades .with the perforated partitions and the interior wallsof the cylinder, and during the rotation of said cylinder, the cascading, "dropping and agitating of the material in conjunction with the counter currents of heated air combine to form ,a drier -of great eiiciency. The lifting blades may be placed midway of the compartments 5 or they, may be placed in to the partitions 5 as` shown in Fig. 8. rlfhe prevention of the inrush of air at the top of discharge end deris provided for by a stationary plate 6 which blinds a portion ofthe discharge opening. i

While I have described my invention as ,shown in drawings the detailed construction may vary in many respects, vbeing limited only so far as included in the claims of the cylinand made necessary by the priorstate ofv the4 normen located within the main cylinder near the feed endthereof and concentric thereto, in combination with a cylindrical casing surrounding said auxiliary cylinder, an annular air chamber between said cylindrical casing and the auxiliary cylinder, said air chamber being closed at the feed end and open at the opposite end, and air connections from the exterior of the main cylinder to the annular air chamber.

3. In a rotary drier, that portion of the feed end of the cylinder extending over the fire zone of the furnace, provided with.. a perforated lining,I in combination with an auxiliary cylinder located within the lined portion of the main cylinder, and concentric thereto, a cylindrical lcasing surrounding the auxiliary cylinder, an annular airchamber between said cylindrical casing and the auxiliary cylinder, said air chamber being closed at the feed end and open at the opposite end, and air connections from the exterior of the main cylinder to the annular air chamber, whereby heated air from the furnace circulates through the auxiliary cylinder.

4. In a rotary drier, in combinationwith the main cylinder, an auxiliary cylinder located within the main cylinder, concentric thereto and at the feed end thereof, over the fire zone of the furnace, a hopper adapt- 4ed to feed material to both the main and auxiliary cylinders, an annular air chamber surrounding the auxiliary cylinder, said air chamber being closed at the feed end and open at the opposite end, and air connections from the exterior of the main cylinder to the annular air chamber near the feed end thereof, whereby heated air from the furnace circulates through the said air chamber and the auxiliary cylinder.

5. In a rotary drier, a cylinder having a plurality of longitudinal shelves or blades therein, air chambers in the body of said blades, openings from said 'air chambers through the cylinder shell to the exterior thereof, and openings from the air chambers to the interior of the cylinder.

6. In a rotary drier, a cylinder having a plurality of longitudinal shelves or blades therein, said blades being attached to the cylinder shell, air chambers in the body of said blades, openings from said air chambers through the cylinder shell to the exterior thereof, openings from the air chambers to the interior of the cylinder, whereby heated air is circulated from the furnace through the blades to the interior of the cylinder thereby heating said blades, and means for protecting theopenings from the air cham# bers to the interior of cylinders to prevent he admission of material to said air chamers.

7. In a rotary drier, a cylinder provided lwitlr ai seriesof longitudinal,A- radiah, perfo rated partitions, whereby said cylinder is i dividedinto a. series of compartments, longiitudinal shelves or blades attached to the fshell within said compartments, air charnbers in the body of said blades, openings 3 from said air chambers through the cylinder shell to the exterior thereof, openings from the lair chambers to the interior ofthe cylinder, whereby heated air is circulated from the furnace through the blades to the interior compartments, thereby heating the blades and distributing the heat, and means for protectin the openings from the air chambers to t e interior of cylinder to prevent the admission of material to said air chamber.

8. In a rotary drier a cylinder having a plurality of longitudinal shelves or blades therein, air chambers in the body of said blades, openings from said air chambers through the cylinder shell, openings from the air chambers to the interior of the cylinder, and a stationary shield adapted to close the upper portion of the discharge opening of the cylinder, whereby the inrush of air to top of cylinder is prevented. 9. In a rotary drier, the combination of a main cylinder, an auxiliary cylinder located within the main cylinder concentric therewith and at the feed end thereof, over the tire zone of the furnace, a hopper adapted to feed lnaterial to both the main and auxiliary cylinders, an annular air chamber surrounding the auxiliary cylinder, said air chamber being closed at the feed end and open at the opposite end, air connection from the exterior of the main cylinder to the annular air chamber, a plurality of longitudinal shelves in the main cylinder forward of the fire zone, air chambers in the body of said shelves, openings from said air chambers through the cylinder shell, openings from the air chamber to the interior of the cylinder and means for protecting the openings from the air chambers to the interior of the cylinder to prevent the admission of material to said au chamber.

10. In a rotary drier, the combination of a main drying cylinder, an auxiliary cylinder located within the main cylinder concentric therewith and at the feed end thereof extending over the tire zone of the furnace, an annular air chamber surrounding the auxiliary cylinder, said air chamber being closed at the feed end thereof, air connections from the exterior of the main cylinder to the annular air chamber, a series of longitudinal, radial, 4perforated partitions arranged in the main cylinder forward of the fire zone and dividing the cylinder into a series of compartments, longitudinal shelves attached to the shell within said com artments, air chambers in the body o the @4g l imma@ shelves, o enings from said air chambers 'adapted to iprevent the inrush of air at the through Vt e lcylinder shell, openings from upper part of the discharge opening of the the air chambers to the interior of the cylincylinder.'

` der, means for protecting the openings from I CECIL BASS SMITH. 5 the air chambersto thev interior of the cylin- Wltnesses: Y v

der to prevent the admission of material into L. F. Gmswom,

said air chamber, and a stationary shieldl.v FRED C. SCHLATTER.

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