Патент USA US2406077код для вставки
Aug. 20, 1946. 2,406,071 à A. F. Howe: COAL DEvoLATILI-'ZER Filed June 15, 1944 w@ . m». 5 Sheets-Sheet; 2 «à 11,l mk kh, Aug. 20, 1946. ' - ‘_ A. F. HowE COAL DEVOLATILIZER Filed June 15. 1944 ~ 2,406,077 l ' ' -5 Sheets-Sheet 3 WÚMMW Aug.. 20, 1946.V ' -- A. F. HowE coAL DEvoLATILIzER Filed’ June 15., 1944 ' - ' ` 2,405,077 _ 4 5 Sheets-Sheet 4 Aug. 2o, 1946. A. F. HQwE y , COAL DEVOLATILI ZER 63 57 " - 2,406,071 2,406,071 l Patented Aug. 20, `1946 UNITED STATES PATENT OFFICE COAL- DEVOLATILIZER Andrew F. Howe, University City, Mo., assignor to Centrifugal & Mechanical Industries, Inc., St. ` - Louis, Mo., a corporation of Missouri.A Application June 15, 1944, Serial No.->540,51-2V 7 Claims. (Cl. 202-26) y 2. 1 This invention relates to devolatilization of coal; and it has Special reference'to a method slurry coal or quantities of small bodiesr of coal and apparatus forreducing thesvolatil'e in coal briquettes or bodies for combustion, or is not soy so that slurry coal or small bo‘dies of coal that will formed. regardless of whether the coal is formed into . pass through a screen having a relatively fine Fig. 2` isa vertical longitudinal sectional‘view mesh may be readily formed into combustible of an apparatus for reducing the volatile content briquettes and nearly all of the combustible gases of slurry coal or of quantities of small bodiesoi burnt during combustion of the briquettes. coal, and also forming the devolatilized coal into An object of the invention is to provide a briquettes or solid bodies. Y f method and apparatus for removing the volatile- 10V Fig. 3 is an enlarged sectional view of a portion from slurry coal and from quantities of small of the conveyor for the slurry coal or srnall bodies of“ coal by carrying the same through a particles of coal and of one form of device for heated'oven by a constantly'moving conveyor so shaping the coal into solid bodies or briquettes. that most or a desired amount of the volatile Fig. 4 is a still further enlarged sectional view content of the coal will be detached and sepa 15 of a portionyof the device that shapes the coal rated therefrom, withdrawing the separated vola into solid bodies or briquettes. Y , tile content from the oven during -movement of Fig. >5 is a plan view of a portion of said device. ‘ thev coaly therethrough, andthen forming the sub Fig. 6 is. a perspective view` of a solid body or stantially devolatilized coal.` into briquettes or:` briquette of dev_olatilized slurry coal made by the other substantially solidbodies‘ convenient for 20 apparatus of the present invention. ' handling, transportati’omand combustion. ' Fig'. 7 is a‘vertical cross-sectional view on the Another object’ of--the invention is to provide `line '1_1 ofFig. 1. an apparatus for `separating a desired amount of ~ . ’ _ y Fig( 8 is aside elevationof the apparatus shown` ,_ the volatile content from slurry/coal `and from in Fig, 1. . . ì quantities of small bodies of coal by the appli 25 Fig. 9 is la sectional View of'a portion of an ap cationofheat generated by al combustion device paratus for Vforming the devolatiliz’ed coal into using 'and burning the separated volatile con solid bodies or briquettes. tent of .the coal, or using and-,burning other fuel Fig. 10 lis* an-enlarged side elevation of one of or using and burning both saidrseparated vola the cutting rolls shownin Fig.'9.v ' tile `content‘and said other fuel, as` desired, andV Fig. 11- is a similarly enlarged sidevelevation means for formingv thesubstantially devolatilized. of a portion ofa cooperating cutting roll. coal into solid bodies or briquettes that maybe conveniently handled and which will readily burn Fig. 12 is a perspective view of another form ` or shape of a solid body or briquette of devola Without discharging objectionable quantities ofv obnoxious smoke, fumes, and gases. ~ Another object of the invention is to provide an tili'zed coal formed by~ the rolls shown in Figs. 10` 2:5 and 11. ` improved method forreducing the volatile cont Fig. 13 is a vertical'longitudinal sectional view of an apparatus for practicing the invention by tent in slurry co-al or small bodies of coal» by the use of fuel gas only. passing Vor conveying’said coal into, through and ' , _ The apparatus shown for removing» volatile from a heated oven at a selected 'rate of speed, 40 from slurry coalor from quantities of small bodies 1 withdrawing from said oven the volatile content emanating from the coal therein and thereby creating ¿or forming a partial vacuum in said of coal comprises Ya furnace having refractory enclosing walls I. This apparatus is an embodi-` emanates from the coal therein and which is may 'be divided-into at least two combustion chamber'sor fire-boxes 2 by a partition 3, alsoç preferably composed of refractory Vmaterial. Each combustion chamber ofthe furnace may ment of an idea of means comprising part of the` oven, supplying fresh air into Asaid oven to re invention for successfullyV practicing the methodv place r» or rreplenish the .volatile content that 45 portion ofthe invention. If desired, the Vfurnace withdrawn therefrom, and` discharging the coal4 in any form desired after it has passed from said oven. . ; Other objects will appear from the following 50 -enclose a chain grate yStoker `Il of known con description, reference being made to the annexed struction and actionfmounte'd at one side ofV they drawings, in which-_ . 1 , Fig. 1 `is a plan View showing one form of an furnace on a rotative operating or driving roll 5 and, at the opposite side of the furnace, on a apparatus for practicingv the present invention rotative supporting roll- 6». The rolls 5'and‘6 areof substantially 'reducingy the volatile contenty of 65 preferably. ofY the samev diameter and rotate about 2,406,077 3 Y c ends of the furnace. The shaft 20 may be con Í À horizontal axes in the same horizontal plane. Y In stantly or intermittently rotated by connections the modification of the apparatus shown, there . 3| operated by an electric motor 32 through suit- .Y l Vare two combustion chambers 2 each having‘ therein a chain grate stoker 4 and having the able speed reducing gearing (not shown). Be driving rolls for r`said respective chain grateï stokers mounted at opposite sides of the furnace. tween the sprocket Wheels 23 and I9 the chains ' I8 operate along and are supported by rigid rails Within the furnace, the ends of the chaingrate ‘ __ ` „ stokers 4î'o'perate'pn,and'along'supportingrails1. ‘ ` Each driving 'roll 5 may‘b'e -rotated' intermittently'j or continuously as desired by operating mecha-v , nism provided for that purpose; As shown, an ' electric motor 8 is operatively connected withthe l Y t »shaft 9 of each operating roll 5 yby suitable speed reducing gearing I 0. Any knowntypev of coni-2 nection driving roll from5 the maymotor be employed. 8 to the shaft SolidA3'fuel ofeach such tf as kcoal may be fed onto the endofyeach grate 4 ï _ f above Yor adjacentto the driving roll 5 through ' a hopper-Y II. The hoppers II extend Vthe' ‘full‘ 33 which support the uppers‘tretch >ofK the con veyor Í inra straight horizontal' plane; andïfprevent 1 . sagging thereof. iIf desired‘,“the‘"intermediate por tion of the conveyor bottom walls 29 between the chains I8 may be supported by any appropriate device. It will be noted in Fig. 2 that the bottom walls 23 of the conveyor pans 29-30 are close to -the covers I3 which form the bottom wall of the *oven I4 through which the coal is carried by the conveyor and subjected to heat emanating from Y _ the furnace.VV . The slurry coal or quantities of small bodies of - coal are deliveredonto the upper stretch ofthe y conveyor comprising the pans 29-30. The coal width will ,. discharger ofthe respective lthe coalchain onto grate said stokers grate stokersl 4, and 1 is delivered in controlled quantities Vthrough a for movementïinto the furnace. The two grates, shown move inlopposite directions across the fur lowerend extending nearly the fullwidth of thev nace .through the respective chambers 2, fromv which -the burnt gases, smoke, andlikeprodu‘cts» ofcombustion are conductedrand passthrough chute 34 `having a discharge opening 35 at'its conveyor between the side walls 30 of the piv ,otally connected conveyor pans.? The walls of the chute 34 forming the discharge opening 35 ter-Y minate immediately above the'side walls 30 of thef conveyor pans and doV not interfere WithY the free g Vcombustion chamber 2 at the opposite side of the`l movement and operation of said conveyor. A furnace .from the stoker _hoppers Il. Each com»` ' bustionA chamber4 2 is provided Witha cover YI3, :sa hopper 35 for containing the slurry coal Yor quan tities of rsmall Vbodies of coal tov be processedv by preferably of. metal and which may beof archil this invention opensvinto the upper end of the formationand whichprevents ignition and com-` chute 34. Measured quantities of slurry coal or bustion of a'slurry. coal or Quantities of smallî flues> iI2; _ One „of the ñues I2 ,opens fromV eachV . bodies fo coal conveyedA through the oven ¿I 4 «above t ' the furnace. * . The ovenV I4 is wholly out of communication' with 'the combustion chambers 2 and is covered by ag top -wall I5 which may be composed* ofthe î Ysameärefra‘ctory material iormingthe'walls I. and;V fof Íthe small bodies of coal contained in the hopper V35 are -moved from said hopper and discharged Vinto the chute34 automatically and as an inci dent to operation of the apparatus. A rotary l shaft 33 extends horizontally across the »comf-V Ymunication from the hopper 35 to the chuteA 34 'concentrically with opposite portions 3'I andl38 , 3, or of other appropriate material as desired..V An1_ Tof -theV Walls connecting'said hopperv withI said elongated-‘horizontal inlet fopening'zIS is formed through one of the walls I of thev furnaceV above»Y chute. Thefshaft 3B is rotated byvdrivingfcon-k " the cover I3, anda complementary horizontaliouta Y nections from the motorlß. . A pair of circular end -. Walls 33 are attached -to` the shaft 36 and are Y let opening I'I is formed through the opposite Wall lof the furnace. vThe, conveyor forv theslurry" 45 connectedcby4V walls A4I] extending rradially from the Ashaftf36, and cooperating withthe Wa11s39 to coal `or quantities of smallbodie's of coal passes;V form' measuring _compartments 4 I'. >Each meas through the opening I6 into the oven I4 and' passes .from saidV oven through the opposite -com plementary openingul'l. The conveyor itself is; `~ of ,novel` construction, comprising Vat least two , endless »series ‘of pivotally connected y_links YI8 forming endlessV chains engaged with two axially alined sprocketwheels VISÍattached to a rotary 1 actuator shaft 20 beyond,V the outlet openingV I'I.1 The sprocket chains I8 engage similar sprocket wheels 2I, 22 and 23 attached to shafts 24,25 and 26, respectively. All of the shafts 20, 24, 25 andv 26 extend horizontally and> parallel with Yeach other. 'It is evident that, when the shaft 20 is rotated in a counter-clockwise direction, as indi-v cated by the arrow 21V (Fig. 2) , the sprocket wheels _I3 Will be rotated in the same direction and' will; ' thereby move both or all of the sprocket chainsV I8 in theqi're'ctioii of the arrow 2a. Y' 1 „ « Y Y The` complementary links I8/ on the respective chainssupport -pans veach comprisingY a bottom uring 'compartment 4I will Yreceive and move a quantity of slurry coal orrsmall bodies of coal from the hopper 35 during rotation of the meas uring device and successively discharge said quan tities into the chute 34 from which the coal moves by gravity Aonto the conveyor. The shaft v36 is rotated by a'connection 36' operated by the ro- ` tary conveyor shaftiZB only whenAV the conveyor isY operated bythe shaftA 2IJ__ (Fig. V8). ». . . _ A pipe 42 opens through the topV wall I5 of the oven I4 and constitutes an outlet passage for With drawing gases and volatile liberated from the coal in and passing through the oven I4. r.A'vacuum pump 43 operated by connections 44 driven by al motor 45 is connected to the eñluent end "of theV passage 42 and functions to withdraw gases and" volatile from the oven and form or create a par tial vacuum therein. . The oven' I4 is airtight, and receives no outside air except .through -the open Wall 29 extending therfull distance betweenthev ings I6 and ' I1. tworrsidechains I8, and two end walls 30. `The Y the emanation and withdrawal of volatile con- ' Vheight'of the side walls 33 ,of thepans is less than. theriverticalrwidth of the vopenings VIG’and I’IfintoV and from the oven I4, sothat the conveyor'com prising theV sprocket chains I8» and the pans l-23-930 jmay pass'freelyßthrough said openings. The pair of shafts îßrand 24 and the complem?en, tent from the coal Within Vthe oven. This feature substantially aids From the Y f vacuum pump 43, a -pipe~46-conducts ythe gases and volatile into a tank 4'I which may be located in any place desired and which is shown Íbetween".y ~ one of the walls I ofthe furnace'and the _adja-' cent pair of>-shafts 2ûand 241~7A pipe 348 opens tary _pair of shafts 25 and yZtare beyond opposite >75 fromtheginsideoffthe lupp'erfend of the tanliz'pllr'l'V d sacem? 5 6 and has .stretches or .extensions ¿49.:across~1each combustion .chamber :'2 substantially .above ithe stokergrates 4.and below the.covers ‘|53 iofthere spective combustion chambers 2. The stretcheso? extensions V4.9 are providedwith numerous gas out for «the fshaft §25, '.etc. .At i the ¿opposite :endthe mechanism .i comprising 'the shafts' 120, Í 24, lthe briquetting device, .the 'mechanism' "58-159-'161 and itheïbrushi63-“B.4, are enclosed ina~com- par-tmentformed by Said enclosing wall .69. let` openings '50 :for.discharginggasfinto the >com bustionchambers for mixture with the gases and fumes rising from the v.burning coal V`en_thek stoker YAir .maybe admitted into the space 'enclosed by the Walls 'I9 >and th'ence intothe oven-'Min order .to prevent formation of excessive'va'cuum grates, and thus burning said gases constantly therein 'by operation of the vacuum pump .43 during voperation of the apparatus. 'By making 10 which withdraws gases and air from theoven >Ifl‘l the-areas of the holes 50 of proper size,:they will through 'the pipe 42. An air inlet device 1| opens co'ntrolthe pressure of the gases .pumped there into one end_of said space .which is Venclosed by throughanddispense .with .the necessity of .using the kwallsï 69 Yand Vfunctions'to admit air into said valves‘ior the like in connection with .the pipe .138 space and thence into .the oven f|4¿th'rough.`the ofithe. :extensions '48. . 15 openings I6 andtlr'l. Thus, >theair inthe oven L'Ilwo Aparallel `horizontal shafts A5IA and ¿52;a're isreplenished> andv formation of vexcessive :vacuum supported ¿forrotation above the conveyorZB-Bß adjacent -.to .and ¿beyond ¿the outlet .opening :l1 therein is‘prevented. _ « ~ ïBy. themodiñcation shown‘inFigs. .9, »10=andf I1, from the oven -M :and between the v'furnaceîwall thedevolatili'zed coalon the conveyor i2 9-430 may I and the vertical plane or discharge end »oflthe 20 becompressed and cutíinto‘solidbodies orlbri shaft 2i).V A 'pair oflsprocket'wheelsf53.is attached to'eachof said shafts 5I .and‘:52. An endless de vice fror forming the .'devolatilized coal intosolíd quettes 12 (Fig. 12) otherwise than >.by the `de viceshown in Figs. A3, 4 and ».5. In substitution for said zdevice, the said »mechanism shown in. bodies or briquettes is enga ged _upon the sprocket Figs.- `9, v10V and 11 may `be used for compressing, wheels 53. .Saiddevice comprises as'eries of piv 25 shaping and cutting the coa'l on the conveyor otally connected .transversely elongated 'links 54 £9435 into solid bodies or briquettes. An- end in which are formed `molds .'orcutters 55;forcut-lesspresser- devicei13 is mounted> on the- sprockety ting and compressingthc layer of substantially Wheels 53 in substitution for the endless cutter devolatilized sheet of slurryY coal orsheet of small 518-455„and isA formed with a smooth outer sur bodies of coal spreadupon'th‘e conveyor bottom 30 face instead of thermolds or cutters >55. ‘The walls '29'.and which had. been carried Athereby presser device operates inthe same manner as through the >heated oven I4. The moldsxor cut the endless device 54 which contains th‘e molds tersï55 ¿cut vand compress the substantially `devola or .cutters‘55 and functionsto compress, smooth tilized layer of coal into solidV bodies orîbriquettes and flatten thedevolatilized coal on the »conveyor 56 (Fig.r 6), leavingzsaid solidîbodies .or .briquettes ‘2Q-13D. Forwardly beyond the presser `device 13 56 on'the .conveyor for :discharge therefrom Ibe yond the s'haft2û. vOne of the shafts `5| Aorf52 may be’rotated by the connections 3l .operated 'by ‘the motor 32 for rotating the shaft 12a (Fig. '8),or otherwise as desired. Thus, lthe >-conveyor and the 'briquetting device may be concurrently oper v a roller 'M extends parallel with the upper sur-V ated. ' .From the conveyor 252-30, the briquettes ‘are discharged >intoa ch‘ute T51 and conducted >to a rotary discharge fdevice comprising a shaft 58 attached Vto circular end Walls-"59 connected‘by Walls 6i) extending radially from 'the shaft 58. The shaft>53 is rotated by’connections 58’ oper ated by :the motor 32. The walls ‘5S-6U ’form compartments 6| lwhich receive quantities of briquettes from’the chute :51.and deliver them into a discharge chute 62. 'Any particles of vcoal adhering to the conveyor may ‘bedetached there-V from by‘a brush-63 (Fig. 2) supported andoper ated by a rotary shaft `«lit below the plane of the shaft 2G. 'I'he brush 63 maybe rotated in'th'e direction o'f the arrow f55 (Fig. 2) >and thereby impel and cause the detached particles of coal to drop by'gravity into Va space 66 from vwhich they may be Vremoved and replaced, or otherwise disposed of as desired. The -end of each combustion chamber 2 .oppo face of the conveyor 29--~30 and `has numerous circumferential and longitudinally spaced cutting knives or ñanges 15 which cut the compacted de volatilized coalinto parallel longitudinal-strips y during movement ofthe conveyor 21S-30 «under th‘e .said roller 1.4. Adjacent to v:the rol1erf1ï4 another roller `16' havingnumerous longitudinal cuttingknive's or flanges 11 .is >arrangedjtorcut transversely 'the pressed devolatilized .rcoal `that had been cut into parallellongitudinal:stripsfby the circumferential flanges'or‘ cutters 15.> The roller 14 with its circumferential flanges .or cut ters 15 and the roller 16 Withgits longitudinal flanges or cutters 11 cut the pressed Vdevolatilizl-:id coal intosaid solid bodies or briquettes12 which are discharged or dropped Ifrom the «conveyor 29-30 into th'e hopper 51, asïdo the -solid ‘bodies or briquettes 56. The relative positions ofthe rollers 14 -and 16 may be reversed, and they may be positively driven or freely rotative if desired. The modiñcation shown in Fig. 13 is designed for the exclusive use of gas asv a‘fuel Within the combustion chambers. That is, from the said modiñcation of the invention shown in Fig. 13, the coal Stoker gratos 4, motors 8 and >connec tions therefrom for operating said stoker grates, th‘e ashpits 61.for receiving ashes andsolidrefuse from the combustion chambers 2, and other parts» site from the fuel feed h'opper Il -and'driving roll 5 discharges the ashes and’waste remnants required when coal is used as a fuel and ,that are of the burnt coal into a'closed ashpit'61. -Above not required when gas alone is >used as a fuel, each ashpit 61, the ends of ~thecornbustion Vcharn bers2 are-provided with clean-out doors'ßß‘which are omitted._ In this form of the invention, .the areí closed during operation of the apparatus and vertical >height of the> combustion chambers 18 . which lmay be opened to Vpermit ‘the respective is considerably less than the vertical height of combustion chambers to be `cleaned Vby removal 70 the combustion chambers >2 to which they are of solids therefrom. Beyond the'ends vof thev otherwise analogous. From the stretches . or ex furnace, Yenclosing Walls 69 extend. At one end tensions 49 of the gas conduit pipe 4.8, numerous the fchute -34 opens through the topof -the- enclos gas burners '19 receive gas and extend toward »the ing wall A69 'which encloses the lmechanismfcom metallic covers I3 for said combustion chambers prising the shafts 25, S26, adjusting devices ‘10 75 18. Additional -qu-antities #of -either natura-l »or 2,406,077 7 8 Í movement >of said coal through 'said oven,V and manufactured gas may be supplied into the tank lll.:v or .directlyto -th‘e pipeV ¿I8V or stretches 49,. compressing said coal flatwise on said conveyor ‘only after said coal has been moved out of said 5 through -a pipe ’80, so that a'constant supply of i ì Y a suiiicient amount of gas is always delivered and oven. ' v e . 4. An apparatus for reducing the volatile con tent of a loose and unpressed layer of slurry coal . . supplied to the burners 'i9 when theapparatus i -is' `in use.. Necessaryïair may be admitted intoV and small bodies 'of coal," comprising .walls form- " ing and enclosing an oven and including two IBIV provided for that purpose. In other particu opposite walls having elongated horizontal openf lars, the construction and form of the apparatus i shown Vin Fig. l3§is th'e sameV as that’already de 10 ings Ytherethrough near the bottom of said oven, said walls also forming and enclosing a;com.scribed and as shown in Fig. 2, and like reference q lbusti'on chamber below said oven forY heating the numerals are applied to the same parts.k .Y _"From ’the `foregoing disclosure, it is evident ‘K same, an impervious metallic coverforsaidicom-f bustion chamber forming the bottom Wall of said that this invention produces solid bodies or bri- ; quettes of devolatilized‘coal ready for satisfactory § Y oven and supported Vby and cooperating ,With >said first walls toseal said oven from said combustion userV as `substantially “smokeless” fuel. 'The ap- ` proximate'temperatures to which theV coal must j chamber and also Qto heat said oven, afseriesfof four parallel shafts outside of said oven and said besubjected while the coal is .Withinjthe oven VIll the. combustion chambers'lß rthrough openings combustion chamber, an endless conveyor .sup or during movement of the coal through said ‘ oven may be predetermined and the apparatus 20. ported by said shafts and extending: through said l ` ' oven and through said openings adjacent toy said mayv be regulated to supply said required tem cover for receiving and moving through said oven peratures. The speed of continuous or intermit said loose and unpressed layer» of saidcoal, other tent movement of the coal through the oven I4 walls forming 'two compartments enclosing »said maybe regulated as desired by controlling the speed Vof continuous or intermittent operation 25 shafts wholly out of Vcommunication >with said oven, a measuring device operated by one of said of -the motor 32 and the connections therefrom` for- rotating the shaft 20 and moving >the con shafts for delivering a layer 'orV measured quanti veyor continuously ¿„ or intermittently. The ap- " ties of saidfcoal onto said conveyor >inone of said I paratus specifically disclosed isY for Aprocessing compartmentsl adjacent to said one shaft, a 'tank slurry coal to lower the volatile thereof to any 13o enclosed in the other oneof said compartments, extent desired, and such volatile may be used and consumed as fuel in the combustion cham means forming a passage. for conducting from ’ said oven into said tank volatile content emanat bers that supply heat for devolatilizing or lower-. .ing fromfsaidcoal in said oven, and a burnerin ing the volatile content of the coal. said combustion chamber having connections f . The invention may be varied in equivalent par 35 communicating. withfsaid tank for burning said Y ticulars other than those speciñcally shown and volatile content and heating said oven.„, l , _ 5. An apparatus for reducing the volatile «con described Ywithout departure from the nature and ' ' tent of a loose andqunpressed layer of »slurry coal principle thereof. and small bodies of coal, comprising Iwalls form-v ing and enclosing an oven and including two op v 1. The method of reducing the volatile con tent of slurry coal, which consists in depositing a ` y posite walls having elongated horizontal openings layerpof> slurryY coal upon a vmoving conveyor, therethrough near the bottom of said oven,„said walls-alsogiorming and enclosing a combustion ` >moving said conveyor and the layer of loose and unpressedslurry coal thereon >into and through chamberbelow ksaid oven forrheating the same,` l" Va. heated oven 'containing ‘onlyair and the lvola-1 45 an4 impervious metallic cover _for said combustion chamber forming the'bottom Wall vof said-'oven tile and gases emanatingr from said coal, With-î and supportedby and cooperating with said ñrst drawing >said air and saidfvolatile and gases em- ‘Y walls to Iseal said oven fromsaid combustion' anating from said coal duringmovement of lsaid chamber'v and also to heat said oven, ran endless coal through said oven, and compressing and ap plying pressure to form said layer'of coal into 50 conveyor extending vthrough said oven and solid bodies or briquettes after »said layer hasv through said openings adjacent to said cover for receiving and moving through «said Voven said been »moved through said oven by said conveyor. .2.' The method of reducing the volatile content nism for moving said conveyor and thereby said tions of said conveyor beyond said oven, a meas gases emanating from said‘coal in said oven „dur compartments,` a. burner in Vsaid combustion ing movement of lsaid coal through said oven. V3. The method of reducing the volatile content . Yloose and unpressed layer" of said coaLYmecha-V ` of slurry coal or of quantities of small bodies of coal, which consists in depositing a loose and 55 . unpressed layer of said coal upon a moving con veyor, moving said conveyor and 'said loose and unpressed layer of said coal thereon into and through a heated oven containing only air and` the volatile and gases emanating Vfrom `said coal,` and creating andforming a partial vacuum in> and withdrawing said air and said .volatile and of Yslurry coal or of quantities of small bodies of ` . coal, Which consists in depositing a loose andïun-l layer of loose and unpres‘sed'coal through _said oven and discharging said coal therefrom, other Walls forming two compartments enclosing por-Y uring device operated by said mechanism for de livering a (layer, of measured quantities of said coal onto said conveyor in one ofi-said compart ments, a tank enclosed in the other lone of‘said chamber; andY meansv for conducting:- from said g tank to said burner Yvolatile content emanating from said coal in said oven. „ .à . 6. An apparatus for reducing the volatile con tent of a looseV and unpressed layer of. slurrycoal and small bodies of coal,Y comprising walls form-j pressed' layer of said coal upon a moving con veyor, moving said conveyor and said loose and unpressed layer of said coal thereon into Yandv 70 ing and enclosing anoven and includingV two op through a heatedroven- containing only yair and the volatile and gases emanating from said coal, posite Walls having elongated horizontal open' creating and forming; a partial vacuum in .andY ' said Ywalls also forming* and enclosing a combus-` withdrawing saidV air and said volatile and gases tion chamber below said oven for heating the ings therethrough near the bottom of said oven,` 1A emanatingv from vsaid coal in@ said ovenduring 75.. same, an impervious metallic cover for said com-4 2,406,077 10 bustion chamber forming the bottom Wall of said oven and supported by and cooperating with said ñrst Walls to seal said oven' from said combustion chamber and also to heat said oven, an endless conveyor extending through said oven and through said openings adjacent to said cover for receiving and moving through said oven said loose and unpressed layer of said coal, mechanism for moving 'said conveyor and thereby said layer of loose and unpressed coal through said oven and discharging said coal therefrom, other walls forming two compartments enclosing portions ings therethrough near the bottom of said oven, said Walls also forming and enclosing a combus tion chamber below said oven for heating the same, an impervious metallic cover for said com bustion chamber forming the bottom Wall of said oven and supported by and cooperating with 'said g first Walls to seal said oven from said combustion chamber and also to heat said oven, an endless conveyor extending through said oven and through said openings adjacent to said cover for receiving and moving through said oven said loose and unpressedlayer of said coal, mecha nism for moving said conveyor and thereby said layer of loose and unpressed coal through said ing a layer of measured quantities of said coal 15 oven and discharging said coal therefrom, other walls forming two compartments enclosing por onto said conveyor in one of said compartments, tions of said conveyor beyond said oven, a meas a burner in said combustion chamber, and means suring device operated by said mechanism for de forming a passage for conducting from said oven livering a layer of measured quantities of said coal to said burner the volatile combustible content emanating from said coal in said oven. 20 onto said conveyor in one of said compartments, and mechanism in the other one of said compart ’7. An apparatus for reducing the volatile con _ ments for pressing and compacting said coal into tent of a loose and unpressed layer of slurry coal separate combustible briquettes. and small bodies of coal, comprising Walls form ing and enclosing an oven and including two op of said conveyor beyond said oven, a measuring device operated by said mechanism for deliver posite walls having elongated horizontal open 25 ANDREW F. HoWE.