US1488248A - Rotary kilns - Google Patents

Description

March 25 1924.`

H. HOLZWARTH PROCESS AND APPARATUS FOR HEATING ROTARY KILNS Filed March 1. 1922 2 muti-Shut l r rain/frs Marsh lfy 1,488,248

H HQLZWARTH PROESS AND APFMA'US TOR HEATENG EOTARY KILNS Filed. Mwah 1 1922 2 Sheets-Shea?. S

BY [SMM Patented Mer. 2,5,` 1924. A

Letze.

l' eminem) ,errno-Doors 'corirona'rio'rt o'r mwN-mmHg, MIiq'i'nsoa'a, 4le ggg- 'roenmonr or" DELAWARE.

To ull-'wilma' it may concern.' i v 4 Be it known that I, .HANS Hoiizwnirrma eitizeii of Germany, resident of Mullieiniori-tlie-Ruhr,Germany, have invented a cei- I tainiiew and useful Improvement in Processes'ja'nd Apparatus for -Heating Rotary Kilhs, of whieli the following is a speoiiioa# tlOl'l;V i f l My present invention relates to tlieheat-y inggofd'iotary kilns, and has been devised part arly Afor the externa-l heating of rotaryokilnsiserving for'the distillation ofA coal ,ande other bituminous materials! .For operations-of. this Character, comparatively 16 lowitentpeisatures gare employed, andvell'z...

speccixil; 'requirements must he f observe First of all, the temperature of the kiln Wall,F tlironghoutitlie length .of thelrilinsliould be Application nien: March 1',

as u niiform as possible within the limitsl of 20 about; 450, and 500 centigrade.; at no point taken :to: avoid 'fainyi Ilocal exoeissiwe lieating Again, it-

of tliefiltiln walilt redtheat desirable thatl the material under treatment,

whiehjowingto the rotation of the. kiln as? a heating `device 0 2 is a horizontal sectionl substantially on line vQ-- of Fig. 1, and Fig. 3' is a sectional view similar to Fig. 1,Y illustrating another foi-inA of tlieiheating device. i

Thelfurnaee proper or combustion clrain- 5 bei' (i is located at a dist ance frein-the rotary' kiln or drum b. This furnace eonsistsof a.

'at a high temperature in a practically coin` plete manner.4 The fuel may hesolid (coal, semi-colte,

placed one grate a', or I inay use coal-dust or other powdered fuel, oiliquid or ygaseous fuel, for which purpose a nozzle o" has been coiitlicting conditions, and

is shown in theA4 t of inutile in which the fuel* is consumed' lignite, ete.) and used in lumpsl together. vThe liot products conduit-.milio walls of wliie 'ehargedagainst the (iron) will `.f/- in the direction indieated'by the arrow;

e, f, 1yill strike Athe ascendingportioiiwof,ttig@ tkilnevii vwhich the li'tillc of the nniterii'il l" and gaseous. cui-'rent to inipin'ge'agairistfl wall, particularly by givinglsaittieondilittfg?i deseending portion, as indiea-tdintFi- .W The conduit e is pi'eferably'llocatedf it plane perpendicular .to "1tlie loitgitnlle igfnl ol' theliih llie'feqiitl'tiit re proaelies the hiln,'and has inlets dd eohl or moderately lnelieateil faiisetting. The tonguef exten sq'uiteel a that'the heating.,r gases issuing tliro'ugl'i'rtlig' Channels h, i.-lret\\'een the led'ges or tongkuw The combustion gases p i'oducedinwtlie :fuif-P nace a have a` feinl'ieratue Yof :iloutk'l centigrade'. This "teniperatu're4 is lno down" to about 7509 eentigiade by the air a l initted ftlirougli xthe inlets The oooliiL etl'eet offthis air i'nay be i'egiilated by Vviii-y"- ing its temperature, that is, I may` employ either cool air,

or air preheated to a degree roportioned to the effect to be obtained, gut in any event only moderate reheating of the air would be employed. 'l e cooling effect of the air may also be regulated by varying the amount of air admitted, for which purpose the openin or inlets d may be adjusted or controlleds individually or ointly by valves or dampers of any wellnown or ap roved construction. Any unconsumed fue particles will be ignited upon striking the highly heated and even incandescent portions of the conduit c, and particular] the ledge or ton e e.

The heatin mixture, aving a emperature of about 50 centigrade, travels lengthwise of the lower portion of the kiln, in the contracting channels .1, and also around the kiln b in the annular chamber k, to reach the discharge ilue g. The wall of the kiln is thus heated to an average tem erature of bout 450 centigade, and at t e time of caving the cham r il: the gases have cooled down to approximately 450 centigradi.

.In order to obtain a better utilization of the heatin gases, I may cause them to ass throu h a eat-exchange up aratus on t ezr way rom the heating chum r k to the discharge llue g to give up part of'their heat to the air whic is on its way to the inlets d. In this manner the temperature of the ses may be reduced to about 150 centigra e before they enter the disc flue.

Various modifications may be made without departing from the nature of my. invention as set forth in the appended claims.

I claim:

1. The process o f heating rotary kilns for the distillation of coal and other bituminous materials, which consists in reducing combastion .i :t: of com arative y ature, u mixin em wit air of lower temperature, and t en.brin 'ng the mixtuie thus cooled into contact with the kiln.

2. .The process of heating rota kilns for the distillation of coal and other ituminous materials, which consists in reducing combustion gases of com arativ y high temperature, then mixing em wi* h a gaseous medium of lower temperature,I and then brin ing the mixture thus cooled linto contact'wit the kiln.

3. The process of heating totals 'kilns for the distillation of coal and other ituminous materials, which consists in reducing combastion of comparative y high tem erature, en mixing them with a ilui of lower temperature, and then bringi the piture thus cooled into contact wit the Y4. The process of heating rotarlg1 kilns for the distillation of coal and other ituminous materials, which consists in producin combastion, gases of comparatively higi temperature, then mixing them with a fluid of high temperlower temperature to obtain a. mixture of about 750 centigrade, and then bringin such mixture into contact with the kiln.

5. The process of heating rotary kilns for the distillation of coal and other bituminous materials, which consists in producing comd bastion` ases of comparative y high tem ature, t en mixing them with a flui fof lower temperature to obtain a mixture of about 750 centigrade, then bringi slich.Y mixture into contact `with the kiln, an thereupon cooling the used mixture to a temperature of about 150 by bringing it into eat-exchange relation to the Said fluid while the latter is on its way to be mixed with the combustion gases.

6. A device for heatin rotary kilns, coinprisingn a combustion ciamber, a conduit eadin therefrom in a plane erpendicular to the ongitudinal axis of the kiln, channels extendin laterally from said conduit on op oslte si es thereof adjacent to the kiln and' engthwise thereof, tongues extendi len fthwse of the kiln on opposite sides o said channels, an annular chamber surrounding the kiln and communicating with sad channels, and a discharge flue conununicacing with said annular chamber and extending from a point adjacent to one of said tongues.'

7. A device for heatin rotary kilns, com.- prising a combustion c amber, a conduit eading therefrom in a plane perpendicular to the'lon itudinal axis of the kiln, channels exten ing laterali from said conduit on opsosite sides thereo adjacent to the kiln lengthwise thereof, said channels being provide .with inlets for a coolin medium.

8. A device for heatin tures, comprising a com conduit leading therefrom toward the central portion o the structure to be heated, spaced tongues extending lengthwise of said structure adjacent thereto, lateral channels located between said tongues and communieating with said conduit, said channels having inlets for a cooling medium, an annular chamber communicating with said channels and extendin around said structure, and

ustion chamber, a

a dlscharge ue extending from said annular chamber adjacent to one of said tongues.

9. A device for heating kilns or like structures, comprising a combustion chamber, a. conduit "leadm therefrom toward the cen- -tra] portion o the structure to be heated spaced tongues extending lengthwise of sai structure adjacent thereto, lateral channels extending in opposite directions from said conduit and contracted away from such conduit, said channels terminating adjacent to said structure between said tongues, and having inlets for a cooling medium, an annular chamber sur! ounding said structure and communicating with said channels, and a kilns or ike strucv discharge flue extending from said annular conduit, an annular chamber surrounding chamber adjacent to one of said tongues. the kiln and communicating with said chan 10. A device for heating rotary kilns, comnel, and a discharge flue extendimz` from said rising a combustion chamber, a conduit annular chamber adjacent to the first-named eadng therefrom, spaced tongues extending tongue, 0n the side thereof opposite to said 15 lengthwise of the kiln, one of said tongues channel. extending close to the periphery of the kiln, In testimony whereof I have hereunto set and the other terminating at a greater dismy hand. tance therefrom, a channel located between 10 said tongues and communicating with said HANS HOLZWARTH.

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