US2366966A

US2366966A - Segmental retort

Info

Publication number: US2366966A
Application number: US385061A
Authority: US
Inventors: Fred G Julyan; William M Schweickart
Original assignee: POCAHONTAS FUEL Co Inc
Current assignee: POCAHONTAS FUEL Co Inc
Priority date: 1940-08-03
Filing date: 1941-03-25
Publication date: 1945-01-09
Anticipated expiration: 1962-01-09

Description

Jan. 9, 1945. F. G. JULYAN ETAL SEGMFNTAL. RETORT Original 'Filed Aug. `3, 1940 lNvlaN-rolasv l n www n. www an @www @u Patented Jan. 9,

:2,366,966 sEGMENrALRmoRT tFred G. 'Jul'yan "and William ;M. sohweickarr,

Euclid, Ohio, assignors :to .Rocahontas AfFuel Company Incorporated, New iouk,.tN. Xaraecorfporatonfof Yirginia original .applieation August ls, "1940, serial trio. '350,500. Divided fand this application March :25,1941,"s-eria1-Nn 385,061

renna.

v .'I'his ,'invention relates to `stclsers and 'particu- :iarly to those ,rn-ade :.for ydorrresjtic and ...anallQeQllS "The object ,of :the invention gis .lto provide .sa Ysimple and vinexpensive burner unit for :such ,a `v`Stoker in which the portion ojf *the exposed ftp I-theheat of 'the ,rejis notinjured'by 'warpaga due, lfor example, Lto the vexistence of `-different temperaturesin different parts of the hurner' 'In the .accompanying drawing,

`stker enoodying the invention; jEig. '251s a verticalsectional view `vvof 'the ,burner unit takenalong the axis of the VAconveyor asindicated jby the 1line v412---2in '.Eig. ,1;

Fgs ..3 rand fi are elevational 'views ,offtuyre sfgmerits ,'f-rom different angles., and ,F5g.`5 is a ,plan view vof lone of :the .tuyre segments; "and e :Referring Sto .1 rand g2., .the burner unit .consistsof anu-mer xbody `6 ,tting @over'the conveyor pipe `4 and ,clamped in .positionlby the ,'hurnerbodyyokel. 'The top ;of theppe! ,is pyrovded with Va ,generally .circular `coal .opening ,8

'thezedges of whiohvare engagedhy thebo-ttom ,of

`the inner annular retort .surface ,'9 lprovided :in burner body Ii. .Bolted toithe top o'f 'therburner body is 'theretort .base .IIIJ the interior 4,annular rsurfacelll thereof .forming upward continuation of the Aretort surface .9. .Positioned above and secured to retort base XID are ,the tuyre segments I2. f

Bumer'body .6 ,hascahollowportion ,I3 with ,a Arectangular Aopening at Kone side .of conveyor pipe '4 forreceiving .theburnerend-.of the -.'rectang.ular j, air ,tube I4. From this opening the 'burner ,hody has apassageway .I 5 ,communicating `with theannular :air chamber 'LB ,formed therein .between the inner annular wall .9 andan outernannular `wall .I`I, :this air `.chamber IIB ,being positioned above -theconveyor pipe '4. LRetortbase .-I D .is provided mman-.annulerenpassageway ..Libetween e the inner :annular wall `9 and ,an outer annular fwall its, .this ,air fpassageway ,I8 :communicating .with the bui-'ner fairy-'chamber 1&6 below :randa-the fence :of fthe ibase `I'll. 'The ange :2| son the :outer wall il 9 Jis, continuous, throughout the `circumfer- -ence -of ffthe ibase I II except .fior :ra port-ion, shown atf22 in Fig. 1, where it-lis omitted, this omitted 'portion being 'fof --sucient jlength to "permit the iinserltionio'f the 'tlly're `segments l2.

FrIfhe *ituy're segments I2 "('see Figs. `:3-155) Jare substantially LU-'shaped l'members having ltheir outer surfaces T21 ftransversely farcuate `about :a

radial lto y-such center so that when .a `number ,of Ptheserare assembled rslide Ahy rside they form a ,ring with the sinner surfaces 26 :of ithe ftuyre ,segments i *forming a surface vextending Lupwardly .from *fthe 35 *top -of `retortfflilase A1I) which is substantially an upward lextension fof -retort `surfaces 1,9 vand :I rI. The lower endsof the inner and :outer `surfaces 216,2'1of the tuyrefsegments :are provided with lgrooves '28 -and 29 respectively, the groove 128 '"20 'on 'the inner surface' 26 ffa'cing 'inwardly (i. ye. towar'dfthe center of fthe assembled ring) -while *the-'groove -29 on the outer surface 21 faces outvwardly =i. -e. away "from the .xcenter of fthe Tassembled ring) so that the grooves2'8 'and 29 care F25 lengaged byitheretortfring-flanges `2l) Aandi I, re-

spectively) In 'assembling the bur-ner sunit, -fthe ftuyre seg- 'merits lI2 are individually inserlted in theportion r22 uo'f"t1f1e'retortibase "IIl "while tting ithe retort Segment fgroove 28 over the inner flange 2.0 and `'then 4'each `re'tor't*segment is zslid around 4circiurl- T'erertia-lly Aso that =-retort segment groove `29 'ts rover 'the outer flange "2 I T'I'h'e *last tuyre isegment to -lbe inserted Iis, the

radiairib ,34a or the-key segment extending the ,whole fhe'ight ,of fthe Ksurfaeesin ,order to Yprevent springing Aof fthesegmentmnder excessive 'fasten- 'silpressuneofthe setgscrewi. l f

Each "tuyte segment "L2, ,including key vsegment 30, has its inner surface '26 provided with two halves of inner tuyre openings 36, the halves being at opposite sides so that they cooperate with 55. they half openings of the adjacent tuyre segcommon-'center and their ,sideslying inplanes ments to form the full-sized, substantiallyy circular, inner tuyre openings 36. These tuyre openings are downwardly directed at a small angle, about and are provided at their lower edge with a lip or shelf 38 projecting within the tuyre segment a substantial amount (about the thickness of the wall of the tuyre segment) so as to tend to catch any ash or other fine particles not in operation. The particles caught bythe shelves 38 are blown out into the re by the air passing through the tuyre openings 36 when the stoker resumes active or forced draft operation. Each tuyre segment l2, including key segment 30, has its outer surface 21 provided with two halves of outer tuyre openings 31, the halves being at opposite sides so that theycooperate with the half openings of the adjacent tuyre segments to form the full-sized, substantially circular, outer tuyre openings 31. These tuyre openings are substantially horizontal and somewhat smaller in diameter than the inner tuyre openings 36, (about one-half). Outer'tuyre openings 31 are also provided with lips or shelves 39 similar to the shelves 3S and for the same purpose, the shelves 39 projecting within the tuyre segment a somewhat smaller amount than the shelves 38 (about one-third), in view of the smaller size of the outer tuyre openings.

Surrounding the retort and below the crest of the tnyre segments I2 are the grates 41 which are supported for rotation about the retort. The inner edge 41a of the grates extends substantially to the outer tuyre surface 21 above the lower edge thereof. Thus,` the inner grate edge 41a, and the ashes which collect thereon, tend to shield the top oi the outer annular wall I9, and the key segment set screw 33 which is threaded therein, from the heat of the combustion Zone over the grate. The grates are removably supported above a annular ash table 48 which is rotatably supported upon the exterior of the retort by a ball bearing construction including the balls 53. The ash table serves to carry the ash which passesthrough the grates 41 around to the ash discharge conduit 16, where the stationary7 blade 18 scrapes the ash off the ash table 48 into the ash conduit 19, the ash then passing down this conduit and down through ash input opening |00 into the ash portion of conveyor pipe 4. The ash table is substantially enclosed around its periphery by a dead ring 42 which is supported upon the burner body 6.

The grates themselves are in four sections, each of which has a downwardly projecting boss 61 which engages the upwardly extending boss 68 -formed on the ash table 48. In addition, each grate boss 61 has a toothed lugA 69 which fits under a bridge portion 10 formed in each ash table boss 68 for securing the grate segments in place. One of the toothed lugs 69 for each grate segment is shorter than the other so. thai-the l grate segment. is placed in position by iirst fitting In assembling the burner unit I the burner body 6 is first clamped to the conveyor pipe 4 by means of the burner body yoke 1. The dead ring 42 is then secured to the burner body (if not previously secured thereto) and then the ash table 48 and balls 53 are put in place. Theretort base I0 is then secured to the burner body, the tuyre segments I2 then inserted on the retort base as described, and then the grate segments 41 mounted upon the ash table 48, as described.

In operation, the coal is drawn to the burner unit I by the coal flight of the conveyor screw 5 and then pushed up into the enclosed portion or retort 9, Il, 26 of the burner unit by the coal and reverse coal flights of the conveyor screw. Some of the coal is burned within the retort while the rest of it is burned above and outside of the retort. When the coal is a coking coal, much of the coking occurs within the retort, the coke then burning above and outside of the retort. The ashV resulting from the combustion sifts or is shaken through the grates 41 into the ash pocket 46, and onto the ash table 48 from which the ash passes to the conveyor pipe 4 as described where the ash flight of the conveyor screw 5 conveys the ash to suitable disposal means, not shown.

The burner unit described is durable, simple in construction, and contains few expensive parts. Thus, only the tuyre segments I2 (including key segment 30) and the grate segments 41 need be made of expensive heat-resisting material, and these are such that there is a minimum of tool Work ufpon these parts. All the remaining parts are either suflciently air co-oled or protected from the heat of the combustion as to enable them to be made of cast iron or other materials which are not only inexpensive but easy to fabricate.

The tuyre ring formed of the tuyre segments I2 and 30 has a substantially unlimited life. The individual vsegments allow for differences in expansion and contraction under heat and cooling arising from the fact that the retort is subjected to varying temperatures at varying points, around its circumference. Thus the individual segments are free to expand or contract without affecting their neighbors. The expansion and contraction of the individual segments is facilitated by the flange and groove mounting of the segments, this mounting at the same time preventing the dislocation of any of the tuyre segments,

This caseis a division of application Serial No. 350,500, led August 3, 1940.

We claim:

A retort structure for an underfeed stoker comprising a retort .base having base and body castings bolted together and carrying a surrounding relatively rotatable ash table, the upper of said castings having oppositely directed annular ilanges with a portion of one of the flanges omitted, a plurality of inverted U-shaped tuyre segments transversely arcuate about a common center with their sides lying in planes radial to such center, the ends of said segments being provided with grooves lfacing away from each other, said segments'being mounted on said'retort base with the flanges fitting 4into corresponding portions of said grooves,l and a removable vannluar grate restingon said ash'v table and rotatable therewith and surrounding said segments below the crown thereof. v FRED G. JULYAN.

WILLIAM v SCHWE-ICKART.