US2044976A

US2044976A - Apparatus for the treatment of slurry-like materials

Info

Publication number: US2044976A
Application number: US714248A
Authority: US
Inventors: Johan S Fasting
Original assignee: FLSmidth and Co AS
Current assignee: FLSmidth and Co AS
Priority date: 1933-03-09
Filing date: 1934-03-06
Publication date: 1936-06-23
Anticipated expiration: 1953-06-23

Description

LIKE MATERIALS 3 Sheets-Sheet l I j mvlzltrrdR June 23, 1936. J. 5. FASTI NG APPARATUS FOR THE TREATMENT 'OF SLURRY Filed March 6, 19:54

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| l v I 1 I June 23, 1936 J. 5'. FASTING- APPARATUS FOR THE TREATMENT OF SLURRi-LIKE, MATERIALS Filed March 6, 1934 s SheQtS -Sheet 2 Iii),

VENTOR IN if June 23,1936. J. s. FASTING APPARATUS FOR THE TREATMENT OF SLURRY-LIKE MATERIALS Q s Sheets-Sheet :s

Filed March 6, 1934 Patented June 23, 1936 PATENT OFFICE APPARATUS FOR THE TREATMENT OF SLURRY-LIKE MATERIALS Johan S. Fasting, Valby, near Copenhagen, 4

Denmark, assignor to F. L. Smidth & 00., New York, N. Y., a corporation of New Jersey Application March 6, 1934, Serial No. 714,248 In Great Britain March 9,1933

6 Claims. (01.. 263732)- This invention relates to apparatus for drying and heating slurry-like materials, such as cement raw slurry, and may be applied with advantage to preheaters for drying, heating, and, it may be,

partially calcining slurry on' its way to rotary kilns in which the manufacture of cement clinker is carried on and from which the waste gases may be used in the preliminary treatment of the slurry.

7 It has been'proposed heretofore to employ in con-- nection with rotary kilns preheaters in which carrier bodies, such as chains, are suspended from a support which is arranged to rotate about a vertical axis, the carrier bodies, as they move with the support about the vertical axis, being caused to move through a tank to which the liquid slurry is supplied and then to move through a chamber. into which the hot gases from the kiln are directed, the slurry with which the chains are coated being thus dried and heated, and the dried and heated slurry being then separated from the carrier bodies by agitation thereof and discharged into the kiln. It is the object of the present invention to improve the construction of preheaters of this general type with a view to making the api.5 paratus more compact, more readily installed,

less expensive and more eiiicient and in accordance with the invention the carrier bodies, such as chains or plates, are suspended upon a gas permeable, traveling support, such as a drum 80 or an endlesschain conveyor, located in the path of the hot gases from the kiln, provision being made for-the coating of the-carrier bodies with the slurry at a suitable point in their movement and for the subjection of the slurry on thecarrier I bodies to the'action of the. hot gases from the kiln.

In their movement with the upper part of the conveyor the carrier bodies lie upon the conveyor in a horizontal or nearly horizontal position, while in their movement with the lower part of the conveyor' they depend therefrom vertically. The carrier bodies are thus exposed most effectively both for the application of the slurry thereto and for the action of the hot gases. The coating of the carrier bodies with slurry may be accomplished either by causing the carrier bodies to move through a slurry-filled tank or by delivering the slurry through a suitable conduit upon the carrier bodies. Separation of the dried slurry from the, carrier bodies may be effected by relative movement of the, carrier bodies or by mechanical agitation. The invention. will be more fully explained hereinafter with reference to the --.--accompanying drawings in which several em bodiments are illustrated, and in which: 65 Y Figure 1 isa view partly inoutline and partly in section of one embodiment of the inventioma portion of a rotary kiln being also shown.

Figure 2 is a partial view in detail showing the construction of the gas permeable conveyor shown in Figure 1 and the relation of the chain-like 5 carrier bodies thereto.

' Figures 3 and a are-partial views in detail show a ing plates as carrier bodies. g

Figure 5 is a view generally similar to Figure 1, but showing a slightly different embodiment of 10 the invention.

Figure 6 is a partial view in detail illustrating the gonstruction of the conveyor shown in Figure Figure! is a view generally similar to Figure 1, 15 but showing an endless chain belt conveyor for the carrier bodies in place of the drum conveyor shown in Figures 1 and 5.

Figure 8 is a partial view in detail illustrating the construction of the conveyor shown in Fig- 20 ure Figure 9 is a view generally similar to Figure 7, but illustrating a diiferent arrangement of the conveyor.

In the embodiment of the invention shown in 25 Figures 1 and 2 the traveling support or conveyor 1 for the carrier bodies is shown as a skeleton drum made up of rings I and cross rods l and as arranged to be rotated, by suitable means not necessary to be shown, upon a horizontal axis l, 30 r within a chamber 2 to which the hot gases from the upper or'feed end of a rotary ldln 3 are delivered and from which such hot gases. after having acted upon the slurry coated carrier bodies, may be conducted to the stack through a conduit 3 I. 'The carrier bodies I, which are represented maintained at a constant level. In this instance the drum or conveyor is rotated in a counterclockwise direction and the carrier bodies, as they move with the lower part of the drum, hang in vertical positions and in such positions are caused 5 to move through the slurry in the tank 5. As the carrier bodies move with the drum or conveyor above the horizontal diameter thereof they lie against the periphery of the conveyor and in such position are effectively exposed to the hot gases 50 from the kiln 3 which pass through the layer of superimposed and slurry-coated carrier bodies within the drum and then pass out from the drum through the depending carrier bodies after they have passed from the slurrytank. A partition 2.

may be placed in the chamber 2 for the purpose of causing the hot gases from the kiln to pass through the layer of carrier bodies into the interior of the drum I and thence outward through the layer of carrier bodies on the way to the stack.

It is obvious that the relative positions of the carrier bodies as they approach the horizontal diameter of the drum in their downward movement will change, as indicated in Figure 1 of the drawings, and that by such relative change in position the separation of the now dried material from the carrier bodies will be accomplished in some measure. In order to promote such separation the carrier bodies may be retained for a time in position against the periphery of the drum a id then released so that the separation may be further promoted by the sudden change in position of the carrier bodies. For this purpose there may be provided a keeper 2 pivoted, as at 2 and arranged to rest against the carrier bodies. To further promote the separation of the dried slurry from the carrier bodies there may be provided, as at 6, a rotating beater, angular in cross-section, upon which the carrier bodies fall as they'are released by the keeper 2* and are thereby further agitated. The dried slurry, separated from the carrier bodies, may fall into a screw conveyor 1 by which it is conveyed to an elevator 8, from which it may be delivered through a chute a to the upper or feed end of the kiln.

It will be obvious that the carrier bodies may be formed other than as shown as lengths of chain. As represented in Figures 3 and 4 they may be formed, for example, as plates 4 piv otally mounted upon the cross rods I and arranged in staggered relation, the plates hung on "one of the rods I jresting during the greater part of their movement above their horizontal diameter above the-drum,- upon the next rod. It

will. be obvious-that such plates change their relative positions in the movement of the drum conveyor and that by such relative movementthe dried'slurry with which they are coated is separated therefrom. During their movement below the horizontal diameterof the drum they hang vertically and in such positions pass through the slurry in the tank and so receive the coating of slurry, while 'in' their movement above the horizontal diameter of the drum they lie against the periphery of the drum and the hot gases pass through'the spaces between the plates. In this manner the plates are eifectively coated with slurry and the slurry coating is thereafter dried and heated efiectively. 55

In the embodiment of the invention illustrated in Figure 5 the drum l constructed substantially as already described with reference to Figure 1, is rotated in a clockwise direction and the carrierbodies or

chains

4 and 4 are so secured to the drum that some of the chains or parts of chains 4 are within the periphery of the drum, while the chains or parts of chains 4 are, as before, outside of the drum. In this embodiment of the invention the slurry is supplied through a trough I2 and is allowed to spill over the inner edge of the trough and to fall upon the carrier bodies 4 outside of'the drum at the upper part of the movement of the carrier bodies, where theylie against the periphery of the drum. Some of the slurry percolates through the layer of carrier bodies t outside of the drum and trickles down upon the carrier bodies 4 where they hang in vertical lines within the drum. The hot gases from the kiln 3 pass from the lower part of the chamber 2 upward through the coated carrier carrier bodies 4 are caused to pass through the the drum and the carrier bodies above the horizontal diameter to the conduit 9 by which they may be conducted to the stack or other outlet. 5 In the rotation of the drum conveyor some of the dried slurry may be separated from the carrier bodies 4 where the carrier bodies change their relative positions as shown at the right hand of Figure 5 and from the carrier bodies 4, where they change their relative positions within the drum, as indicated at the left hand of Figure 5. To insure the complete separation of the dried material from the carrier bodies 4, there is provided at l3 a beater actuated by an

eccentric I

4, 15 by which the outer carrier bodies 4 as they pass upward toward the horizontal diameter of the drum, are agitated. The dried material separated from the carrier bodies in this instance may be delivered directly into the rotary kiln 3 by a chute 2 which forms the bottom of the chamber 2*.

In the embodiment of the invention illustrated in Figures 7 and 8 an endless chain belt conveyor l5, formed of chains l5 and cross-rods I5, is mounted upon rollers I6, l1, preferably disposed angularly, as shown, and has hung thereon, asshown in detail in Figure 8, chain-like carrier bodies 4 In this instance the conveyor travels in a counterclockwise direction and the carrier bodies, depending from its lower side, are caused to move through the liquid slurry in a tank 5 where they are coated-with the slurry. In their continued movement they lie against the upper side of the conveyor and are exposed in the chamber 2 vin thatposition to the hot gases from the kiln 3- A keeper or heater 6 may be provided below the upper roller l 6'to promote, through rapid change in relative positions of thecarrier'bodies, or through direct agitation thereof, the separation of the dried slurry from the carrier bodies and the dried slurry so separated falls into a screw conveyor 1 by which it may be delivered to an elevator 8 for delivery to the kiln through a suitable chute. In this embodiment of the invention the hot gases are delivered into the chamber 2 at the upp r portion thereof and are discharged from the chamber near the lower end thereof through a conduit-9 In order to direct and control the movement of the hot gases through the carrier bodies a partition I8 is placed between the upper and lower members of the conveyor and a partition l9 is'extended from the wall of the chamber 2 nearly to the conveyor.

In theembodiment of the invention shown in Figure 9 the carrier bodies 4 are applied to an endlesschain conveyor l5, supported in a nearly horizontal position upon rollers I6 I1 within the chamber 2 into which the hot gases. are directed from the kiln 3 and from which they escape through a conduit S A slurry tank 5 is arranged below the conveyor, near the roller I6 and in the movement of the conveyor the slurry and thence into the lower right hand portion 2| of the chamber 2*, about the roller I1 and through the upper part of the chamber 2 A beater 6 is disposed near the roller IE to agitate the carrier bodies as they pass downward over the roller 16 and separate the dried slurry which is then discharged into the kiln by a chute 20. In this embodiment of the invention the ear rier bodies, after they have been coated with slurry in their passage through the tank 5",

hang freely and vertically in the chamber 2! through which they travel for a considerable distance so that excess slurry may drain oil? into the conduit 2| for ultimate return to the slurry tank, while the still adherent slurry is subjected to a preliminary drying before the carrier bodies move about the roller I1 and rest upon one another on the upper side of the conveyor. In this manner a risk of the choking of the openings between the carrier bodies and the consequent prevention of the passage ofhot gases between the carrier bodies is avoided.

It will be understood that various changes in details of construction and arrangement may be made to suit different conditions of use and that, except as pointed out in the accompanying claims, the invention is not restricted to the particular construction shown and described herein.

I claim asmy invention:

1. An apparatus for the drying and heating of slurry-like materials which comprises a chamber to which hot gases may be delivered, a gas permeable conveyor mounted in said chamber upon 'a substantially horizontal axis, carrier bodies hung on the conveyor, such carrier bodies depending fromone side of the conveyor and lying upon the other side of the conveyor in their movement therewith, means to coat with liquid slurry the carrier bodies at a point in their movement with the conveyor, and means to separate the dried material from the carrier bodies after their passage through the chamber.

2. An apparatus for the drying and heating of slurry-like material which comprises a chamber to which hot gases may be delivered, a gas permeable conveyor mounted in said chamber upon a substantially horizontal axis, carrier bodies hung on the outside of the conveyor, such carrier bodies depending from one side of the conveyor and lying upon the other side of the conveyor in their movement therewith, means to 'coat with liquid slurry the carrier bodies at a point in their movement with the conveyor, and means to separate the dried material'trom the carrier bodies after their passage through the chamber.

3. An apparatus for the drying and heating of slurry-like materials which comprises a chamber to which hot gases may be delivered,'a gas permeable conveyor mounted in said chamber upon a substantially horizontal axis, carrier bodies hung on the inside of the conveyor, such carrier bodies depending from one side of the conveyor and lying upon the other side of the conveyor in their movement therewith,-means to coat with liquid slurry the carrier bodies at a point in their movement with the conveyor, and means to separate the dried material from the carrier bodies after their passage through the chamber.

4. An apparatus for the drying and heating of i0 slurry-like materials which comprises a chamber to which hot gases may be delivered, a gas permeable-conveyor mounted in said chamber upon a substantially horizontal axis, carrier bodies hung on the conveyor, such carrier bodies depending from one side of the conveyor and lying upon the other side of the conveyor in their movement therewith, a slurry tank through which the carrier bodies are caused to move in their movement with the conveyor, and means to separate 0 the dried material from the carrier bodies after their passage through the chamber.

their passage through the chamber. 6. An apparatus for the drying and heating of slurry-like materials which comprises a chamber to which hot gases may be delivered, a gas permeable chain conveyor mounted in said chamber upon substantially horizontal axes, carrier bodies hung on the conveyor, such carrier bodies de- .the dried material from the carrier bodies after pending from one side of the conveyor and lying upon the other side of the conveyor in their movement therewith, means to coat with liquid slurry the carrier bodies at a point in their move-' ment with the conveyor, and means to separate the dried material from the carrier bodies after their passage throughthe chamber.

, JOHAN 8. FAS'I'ING.