US2041142A - Production of cement - Google Patents

Description

May 19, 1936.

J. NoRvlG PRODUCTION OF` CEMENT Filed May 2, 1930 3 Sheets-Sheet 1 INVENTOR JMA/v Nw? V/ BY ATTORNEY Po-.terxtedMay 19, 1 936 i A r u u `2,04%1442 Y 1 PRODUCTION OF CEMENT v- Johan `Norvig', Hartsdale, NQ Y.; `assignorro Internatlonaluv Cement Corporation, New` York, N. Y., a corporation ol Maine u i i l y `Application MayfZ, 1930, Serial No. `449,117

` u comms. (crasse-Sappi]` V u I, L t This invention relates 4to theproduction of grammaticrepresentation of aside elevation of cement and more particularly to th'e cooling of an embodiment of my` improved cooler `vvth'the` the cement 'clinkers after they leave the firing "forward portlonshown'in section. `Figures 2 and kiln, r y i f y l o `3 aresect'ions taken on the lines 2-2 and 3--3, l 5 `"Inthelproductionof cementit has been the r`espectively',of`Figure 1M. "Figure lisa fractionalA 5 practice tolcool the clinkers produced in' `the kiln View similar'to Figure 1 showing the hopper filled vby merely dumpingj them into bins or piles and with clinker." j u `allowing the mass to cool slowly by radiation. `The numeral lIf-indicatesja cementikiln` of the 7 oSuchaprocedure is necessarilylslow, and it rerotary type. The lower lend of the'kilnis sur-` lu quires a great deal of space and results ina conrounded byari insulated kiln hood 2 Which is cOn- 10 siderable loss of heatA units. I u nected with acollecting chamber 3. An `opening I y In order to avoid these disadvantagesfattempts f 4 is provided in the lower portion .of one side-'of have been made to articially coolthe clinkers, the collecting lchamber,,through which thehot i such as by cascading themy through `vertical 'staclinkers run by gravity onto amoving chain grate y l5 tionary towersiin the presence ofa counter-eurs 5. The'chaingrate moves continuously around 15 rent flow of cooling `air, or ybypassing them the wheels, 6 as indicated by.v the arrows andthe -throughrotaryccolers provided withvanes to lift clinkers are carried vby" the grate Vtoward the the clinkers and cascadeithem as they are prohopper l. `flhe level o f 'the' clinkers upon the gressedthrough the kiln in Contact with a coungrate may be regulated by a guide lip 8 at the out- 20 ter-current stream of air. The apparatus `relet from the collecting chamber (as illustrated in l0 quired for such operations is very voluminous and Figure 4) or the pile of clinkers may be allowedto thequantity of air necessary to accomplish the take their naturallslope after adjusting the dicooling is greaterthan that needed for the` commensionsandspeedl of the grate to take the nor- Abuston of thefuel in the kiln;I Furthermore, the mal output from the kiln. j i 'air temperature, resulting from the cooling of the The first portion` of the chain'` grate 5 ist sur- 25 clinkersfgisnot raised .sufficiently highzto assist roundedbya hot airchanfiber9fandthe` cooling greatly in `the `combustion of fuel. Also theair air is forced into `this chamber through a'flue I0 leaving this type of cooler is laden with dust par- A"connected with a. pressure `blower II.` The outticles which interfere Withthe practical operation let from the chamber 9 is connected through a u i 439 of the kilnand constitute a nuisance ifnot caught flue lI2 to the rotary kiln ait a point adjacent the 30 y in dust collectors. y f 1 I y fuel pipe I3for supplying powered coal,` oil or gas.

It is an object of my` invention to avoid the Asecond hot air chamber I4 is built aroundthe above difficulties by providing an improved remaining portion V of the uppersurface of the method and means for cooling theclinkers. `It is moving grate` 5' and cooling may be drawn d o further object of the invention to improve the through this portion ortho ,grat-o, `tmroogn the 35 characteristics of the clinkers resulting from. the flue I5 and intothe dust collector I6,`jby`the succooling operation Anothervobjectis to provide `tion`f`an"l'l." e `i quicker and more effective cooling Withla mini- Inperatingmy mprovedcooler, the cllnkers l `mum amount of air and to thereby obtain a `f from the rotary kilnI fall into the collecting and greaterV concentration of `heat units in the` predistributing chamber 3 and form a pile I8 atthe heatedair supplied for combustion in the kiln. bottom vvhich'takes a natural slope and protects A further object is to reduce the quantity of dust the bottomof the chamber from the contact of in the preheated air suppliedto the kiln. Another hot` clinkers, The clinkers"drop ontothe moving `object is to provide an apparatus for accomplishgrate: 5 and spread over the surface of Lthe grate y ing such results. `Other objectsrwill become ap- `to form a smooth layer; This layer isf continuparent. y f 1 I 1 "ously progressed with the grate5throu`ghthe`hot I have `found that by cooling the clinkersvery air chamber 9 where it is quickly cooled.' The quickly after they leave the kiln, the `grindability `liighlyheated air from this portion ofthe cooler of theclinkers will be'greatly improved. To ac- `is lead to theekiln I at a point adjacent thefuel o complish this the clinkers are subjected to conppeand is utilized in the combustion of the fuel. 5

`centrated cooling by passing the cooling air f "The bed of clinkers is thencon'veyed through through a moving grate or grid upon which they the second cooling chamber where asecond draft are supported. i of cooling air is passed through it. 'I'he air from `In describing my invention reference will be this cooling step may be conducted to the dust 5 made to the drawings in which Figure lis a diacollector and thereafter used for heating, drying 55 @UNITE-D: STATES *PLATENTFFICE-f 7 or any other desired use. The cooled clinkers may then be drawn oi through the hopper l and disposed of as desired. n

If preferred theA second cooling chamber Il may also be connectedv with a pressure blower and the cooling air maybe forced through the grate and clinkers. versed and drawn or forced through the clinkers and grate in a downwardly direction. It is also apparent that the cooling may be accomplished in a single chamber extending over the entire length of the grate and the air may be drawn or forced through the clinkers and grate within this chamber after which a portion or all of the preheated air may be lead to the kiln hood through a suitable flue. The dow of air through the first cooling chamber may also be in a downwardly direction, if such operation is preferred.

By following the procedure described the clinkers may be cooled from the temperature of the kiln down to 200-400 F. or lower in about to minutes. The clinkers resulting from this rapid cooling is of such a structure that they may be more easily ground or broken in the subsequent treatment to produce the finished cement.

It is apparent that many other forms of apparatus may be used in place of that described in the illustrations and it isnot intended to hereby restrict the invention to the particular embodi- `ment shown. l For example, the moving grate may be replaced by moving cars having perforated bottoms and the movement of the grate or cars may be intermittent rather than continuous. The improved clinker cooler may also be used with other types of cement burning apparatus, such as a vertical kiln or a chain kiln. y

The preheated air led to the kiln may, of course,

be cleared of dust particles by passing it through a cyclone or'other dust separator if that is oonsidered necessary.'

Since the bed of clinkers is stationaryrelative to the grate the cooling will be` accomplished with the minimum dusting. The concentration of the cooling and the intimate contactof the cooling medium with the clinkers will provide the maximum em'ciency of operation. The passage of the cooling air through the 'grates and hot clinkers v will protect the grades from the heat given of! by the hot clinkers.

What I` claim is:

`1.'In an apparatus of. the class described, a kiln'a hood surrounding the outlet end of said kiln, a perforated longitudinally progressing conveyor in communication with said hood, an enclosure A.surrounding the receiving end portion of said conveyor, means for forcing air upwardly through the portion of said conveyor within the enclosure,` and meansrfor conducting air from said enclosure to the kiln at a position adjacent the fuel feed.: r

` 2.*In anA apparatus of the' classy described, a kiln, a perforated longitudinally progressing conveyor communicatingat its receiving end with the outlet from the kiln, a hood surrounding thereceiving end portion of said conveyor, means for passing air through the clinkers upon the portion of the conveyor within said hood, a conduit for conducting air from the hood to the kiln, a

Xsecond hood surrounding a' subsequent portion of the conveyor and means forcausing air to pass through the conveyor in said second hood and through a dust separator connected therewith.

Also thev current of air may be re` vkiln and adapted to receive hot clinkers from 3. Apparatus for the manufacture and treatment of cement clinkers comprising, in combination, a primary combustion chamber wherein cement clinkers are formed, a clinker treatment chamber arranged at one end to receive a continu- 5 ous discharge of highly heated cement clinker from the combustion chamber, means for advancing said clinkers as a continuous stream through said treatment chamber from van intake at one end thereof to a discharge at the opposite end, 1o means for directing an air draft through said advancing stream of clinkers within the treatment chamber, means separating the air space within the treatment chamber from the primary combustion chamber to prevent iiow of air from 15 the treatment lchamber into the primary combusflue, separate from the kiln discharge, to the kiln and means for passing air through the bed of clinkers upon the grate and through the flue into the kiln.

v5. An apparatus of the class described, comprising a kiln, a perforated longitudinally progressing conveyor grate communicating with said kiln for moving the hot clinkers from the outlet of the kiln, a hood surrounding the first portion of said Vconveyor and communicating with the kiln, a ysecond hood surrounding another portion o'f the conveyor and communicating with an outlet ue and means for passing air through the bed of clinkers on the portions of the conveyor within said hoods.

6. In an apparatus of the class described, a kiln, a conveyor communicating with the outlet of the the kiln and convey them in a relatively thin .layer, an enclosure surrounding the receiving end portion of said conveyor, means for causing air to pass through the portion of said layer of hot clinkers within the enclosure, means for conducting said air to the kiln and means for passing-a separate quantity of air through the layer -of clinkers after it leaves the said enclosure.

'7. An apparatus as defined in claim 6 in which the air from the enclosure is fed to the kiln at a point adjacent the fuel inlet for the kiln.

8. In an apparatus of the class defined, a kiln, a

conveyor communicating with the outlet of the said kiln and adapted to receive hot clinkers therefrom and convey them in a. relatively thin layer, separate enclosures for the iirst and subsequent portions o'f said conveyor, means for causing air to pass through the layer of clinkers in said enclosures, means for conducting the air from the firstl of said enclosuresl to the kiln for combustion therein, and means for separately disposing of the air from the other of said enclosures.

JOHAN NoRvIG.

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