USRE14480E - mcmanlgal - Google Patents

Description

R. D. MCMANIGAL.

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l@ @(@Wlf/ww' APFLICATION FILED JAN. 2l, i918.

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Reissued June i, 1918.

R. D. M CMANIGAL.

DRAFT AIR HEATING SYSTEM FOR FURNACES.

APPL|cAT|oN rLED MN.2|.1918,

Remed June 4, 191s. 1 4,480.

Z SHEETS-SHEET 2 'y "Figa: 'm

4-4 of Fig. 3;

at Logan,

t UNTTED sTATEs PATENT OFFICE,

:ROBERT n. MoMANIGAL, or LOGAN, omo, AssIGNon To THE MQMANIGAL GnATELEss FUnNacE COMPANY, or COLUMBUS, oHIo, A CORPORATION or omo.

DRAFT-AIB-HEATING SYSTEM FOR FUBNACES.

Specification of Beissued Letters Patent. Reissued June 4, 1918,

g'inal No. 1,146,188, dated July 18, 1915, Serial No. 860,059, filed September 3, 1914. Application for l reissue illed January 21, 191B. Serial 110.212,982,

TeaM/whom t may concer/n.:

Beit known that I, ROBERT D. MCMA N1 GAL, a citizen of the United States, residin in the county of Hocking an State of' Ohio, have invented certain new and useful Improvements in Draft-Air- Heating Systems for Furnaces; and I do declare the followin to be a full, clear, and exact description o the invention, such as willenable others skilled in the art it appertains to make and use the same.

My invention relates to improvements in furnaces, and, more particularly, to those of the type known as kilns for burning plastic material.

The main obj ect of the invention is to provide a system whereby the draft air for the furnace may be ypreheated by utilizing the 'waste heat radiating from the furnace,

thereby employing this waste heat to aid combustion. l

A further object of the invention lies in providing simple construction whereby the system may be applied to brick kilns.

With the above and otherobjects in view, the invention resides in certain novel features of construction and combination hereindescribed and claimed and shown in the 1 drawings wherein:

Figure 1 1s a vertical transverse section through a brick kiln constructed in accordance with my invention;

Fig. 2 is a horizontal section takenon the line 2--2 of Fig. 1;

3 is a detail Vertical section .taken on the line 3--3 of Fig. 2;

- Fig. 4 is a similarview as seen on the line Fig. 5 1s a vertical transverse section through one-half of a kiln of ordinary constructlon, showing the manner in which the preheating system may be applied thereto without unnecessary alterations; and

Fig. 6 is a horizontal section as seen on the line 6,-6 of Fig. 5.

In the accompanying drawm from Figs, 1 to 4 inclusive, the numera 1 designates aninner circular wall which supports, upon its upper end, a solid dome or crown 2, while the numeral 3 designates an outer wall which is spaced fromthe inner wall 1 at its u per portion as clearlfyI seen in Fig. 2, while e lower portions o said walls are united to form an integral structure as seen to which and 3. As more clearly seen` in 2, the

wall is formed with a plurality of u ri ht ribs 7 which contaet'with the wall 1, t ere y forming a` number of air passages 8 whose upper ends communicatewith the space between thetwo crowns while their lower ends communicate with upright tubes or pipes 9 which projectthrough arches l0 of fuel openings 11 which are formed through the united portion of the walls 1 and 3, horizontal partitions 12 being located beneath the openings 11 whereby to provide passages 13 through which ashes may be removed from a pluralit of internal re boxes 14 with. which sai passages 11 and 13 communicate. Y p

The supplemental crown 6 vis provided with a fresh air inlet 15 through which air,"

heated air will then be discharged into thefire boxes 14, thereby aidin combustion lwithinsaid fire boxes, the smo e and spent gases being then discharged through the usual perforated bottom 17 into a smoke pit which is provided with one or more outlets 19 which leadto a smoke stack (not shown).

`The amount of heated air fed to the fire boxes 14 may be regulated by the provision of a plurality of ldempers' 20 designed to close and open the upper ends of the tubes 9.

For the purpose of imparting rigidity to the structure above described, the upper end of the wall 3 is surrounded by a continuous metal band 21 which is here shown as located between upper and lower ribs 22.

In the form ofthe invention illustrated in Figs. 5 and 6 the numeral 1 designates an upright innerfwall, 2 the crown or dome thereof, 11 and 13 designate respectively the fuel and ash openings, while. 3 identifies a number of independent upright posts or pillars which are built upon the exterior -cures other functions, chie Ible crown crown ,fand as theintervening chamber or ace isofy relatively large capacity, and as the air flowing through` it is brought into direct' contact with the surface ofthe 'highly heated inner .crown or dome it is apparent that. air in large volume will be preheated tozarelatively high temperature, and ow -throu h the series of down-draft fiues to the re es, such preheated air flowing through the lire boxesso as to render the combustion more -erlcient therein and to becomereheated to the relatively high temperture required of the heat to ybe supplied to, the kilnchamber.

The external crown or dome, in addition to .producing with the inner crown or dome thechambm` 0r Space for reheating air, se-

i) among which are that it affords means for protecting such inner crown or dome `from weather conditions, and, further, that it contributes in a measure to a reduction in the temperature of the inner crown so as to preclude overheating thereof. Experience shows that sin.

gle me kilns when operating on high heats are liable to serious damage by a heavy snow or rainlfpll but this is not the case in my doultiln, for the reasons that the outer crowny or dome alfords a protection to the highly heated inner crown against the accession of rain or snow., and, further, that the circulation of air to be preheated .between the two crowns precludes overheating of the innerl crown and keeps the outer crown at a relativelyl low temperature, it being apparent 'that the large percentage `of heat radiated from the` inner crown or dome becomes abf air whichis blown through the intervening s ace or chamber from the centrally located a1r inlet at the apex of theouter crown, such circulation of coldatmospheric -air tending .to reduce the temperature of the inner crown or domevand operating alsoto reduce the tranmission of heat to the outer crown or dO'IIlBLLf.A` .i

Having thus described my invention, what I declare as new and desire to secure by Let` ters Patent is 1' 1. The combination with a furnace comprising an upright continuous wa1la plurality of re boxes adjacentthe interior of said wall, a smoke outlet from the furnace, and amamicrown supported by said wall., ot a supplemental crown spaced above the main crown, a fresh air inlet into the space between the two crowns, and a. lurality of hot air outlets leading from sais space to said fire boxes.

2. The combination with a furnace comprising an upright continuous wall, a plurality of fire. boxes adjacent the inner side of said wall, said fire boxes having air inlet openin through said wall, a smoke outlet from t e furnace, and a main crown sup-- spaced abovethe mam crown,.a fresh air inlet -into the s ace between the two crowns, and a plurality of hot air outlets leading from said space to said air inlets of the fire boxes. l

3. A furnace comprisin an inner continuous wall having a plura ity of radiall air inlets formed through its lower portion, a plurality of fire boxes within said inner continuous wall, one fire box being provided adjacenteach air inlet, an outer wall surroundin -the inner wall and having a plurality .o upright grooves formed in its inner face whereby to provide hot air passa s, oneof said hot air passages being provid above each of said air inlets, other hot air passa-ges establishin communication between the first name passages and said airl inlets, inner and outer crowns spaced one from the 4other and. Supported by said inner ,crown spaced rom said imperforate crown and reducing therewith an intermediate cham er, a fresh air inlet to said chamber `and a. p uralit of re boxes, of an outer- I intermediate said crowns, and a plurality of A separate hot air outlets for distributin preheated air from said chamber to sai fire boxes individually, said hot air outlets leading substantially from the marginal portion `of the intermediate chamber. v sorbexL in or is taken up by the atmospheric `positioned over the main furnace chamber so as to -be exposed to the direct action of the heat circulating therein, and a plurality of reboxes connected with said main furnace chamber, of a second crown spaced rela ytively to the imperforate crown and roduc` ing therewith an intermediate cham er the cross sectional area of which is equal atleast to the area of the heating surface presented by saidim rforate crown, means for feeding atmosp eric air to the chamber intermediate said: crowns, whereby -atmospheric air is caused to iiow wlthin said chamber and l' into contact with the surfaces of said crowns producing therewith a relatively shallow'y -so as to be preheated thereby, and means C11-@mmm @www @tummyloa the'combination1'y awstibtamiiilly impar r chamberzoffrasecondferowhvspgcedjreltivelzz, to Saad fimpmnmne; harem 'mediate 'chambery n testimony whereof I have hereunto Seil;y 2

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