US1747669A - Cupola top - Google Patents

Description

Feb. 18, 1930.

C. G. HAWLEY CUPQLA TOP Filed March l1, 1926 3mm ww@ jp/z Patented F eb. 18, 1930 as STAT-.B2S

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artesania Marsh 11,. la Samira-@efrainvention. relatest to in113110elngllts in foun dry, 'cup olas, and ithelike, which: emit great quantities Q'f dust@ the detriment if rounding neighborhoods yand'4 which', in'n'iy 5 vievv,runnec,essjarily WasteA greatqua'iititis of heat. The obj ectof ,inyinventiongisl to Y oliviate both, and y, invention comprises `('irtai'n elements adapted tobe place'datthe top of such a stack and which act to conserve the waste heat and the gases emitted by the stack and to prevent the escape of the dust Which accompanies the gas.

The invention Will be readily understood on reference to the accompanying drawing, in Which Fig. l is an elevation of a typical foundry cupola with itsupper part in section and equipped With apparatus embodying this invention; Fig. 2 is a horizontal section on the line 2 2 of Fig. l; and Fig. 3 is a horizontal section on the line 3-3 of Fig. l.

lt Will presently become apparent that my invention is by no means limited to use upon foundry cupolas but is of a much more eX- tensive utility. But a foundry cupola presents opportunities for accomplishments of both of the objects of the invention and for that reason has been selected for special illustration.

Furthermore, cupolas are usually made ,30 much higher than necessary for the sake of the combustion Within the cupola and usually with the mere object of sending the gases high enough to prevent the immediate drop of the dust. In contrast Where my in- 9,6 vention is used, the cupola need be very little higher than called for by the height of the charging floor and the charging door`2. As usual the cupola is arranged on an elevated base and comprises a metal shell 3 that con- 4;() tains a refractory lining 4; the latter extends to the top of the shell, and according to my invention is made to support a Waste heat recovering appliance 5. As well shown in Figs. l and 2, that appliancecomprises a 4,5 tight blast boX 6, arranged on the top of the cupola together With a copper screen S, the edges of which entendY into the blast box 6. The blast box is supplied With pressure air through the connection 6', shown in Fig. 3,

5-.0 and the air is therein heated to a high temperature ,and then by the Way Tof th e pipe 7, is i clondufcted to the bha1 or c hainbei" 8 atthelbbtf toni of 'the cupolaffrom Which thefcupo'la tuyeres are supplied. 'Insulating -material Ii) covers the exposedjslu'rfaces of the, boX Y6 V.and the parts'v 7'v aicl'g., E Because'fof -thevhigh con'- au'avgaypf Copper, @Opper rodear-e1 angustia for malaria *the screen Si Andwitlmaf'itterfeing 'Vvvith 4the tightness of the oint' ifijthe boi: 6,' (loosejoii'its would involveaflossof pressare'l air)` the 'Whole screen is' preferably made'j'o; that it 'may' be 'remoived when 'the door plate 9 is detahed'froiii the remainder of lthe box 6. Mostl conveniently' the' screen isno't Wovenbut instead there'is firsftxa lower course oflcopper rods S 'eatending' in'one direction 'and preferably corrugated' `o"r" 's`pi" rana t@ hola an, pposaeiy @attain-g mais@ or' layer efffstr'yigla'roas Cep-'periferie of frmforiafourthxto onefhalf'inch in diarn'elter ar'e used and their ends extend liberally into the Aspace Within the'boX 6. Generally, they may,4 'be or otherwise zsealed' 'in and become' permanent with 'the' internal Collar 6" 'of 'the blastbon 6,'but in' every'case itfi'ssbelievel' that'the removable section"9 ofn the lblast-boi;l will prove a convenience, both @imag @agian insta-union 'of al# are@ and attimes when repairs are required.

' ,'As 'about' to bejxplained', the dust 1catcher is. erectedpdirectl'y uponthe top' 6a 'of the blast box, 6 'and that 'partl 'of' theblast boX'is used for thejadditiIia-l radiation' ofl'ie'atto the air iii the box'. To supplement the' radiating sniffac'e, the underside of the'ring'ais,provided With a'large number of circumferential or ribs 6"( yl: rieily,`'the copper screenreadily takes up heatfrom thehot gases ascending from'thea cupolaiand "as readily'iiparts that heat tov the,l air zthat moving 'in 'the'A box. Furthermore', this', abstraction of heat so re- ,clu'c'esl the temperature 'ofthe ygases'that any flame' l'that .may flasher exist in the cupola top is suppressed and does not persist 'above' the screen. lThis last lis a practical pier'equisiteto Lso the use of a dustI catcher composed of in'eta'l 'i' and positioned' at the top' of the `cupola. Another ad-vantageof the 'copper' screen flows from the character of the' metal itself Which beingtopgh'resists the abrasive vvearof'the dust particles that rise with the swiftly moving gases.

Rising from the floor ring 6a that forms the top of the blast boX 6, is a plurality of circular series of tangentially positioned blades 10, between every pair of which is a tangential tuyere 11. Obviously, the member thus erected is of about the same internal diameter as the cupola, in practice only slightly larger, and is of no great weight. At their tops the blades 10 are fastenedto' a ringlO and that ring supports a cover plate 10 which is made preferably of very thin metal to the .end that the transmission of any residual heat shall be as little as possible obstructed at that point. Protected by the heat absorbing member 5, the metal parts above it become quite permanent in character. i f VUnder the direction lof the members 10 and 10l the gases rising from the cupola are directed backward against the opposed substantially cylindrical wall 12, which also rises from the plate 6a. This part 12 therefore receives the impact of the dust particles which are deposited thereon by the whirling movement of the gases and are thus separated from the latter. The gases whirl upwardly toward a large central outlet 13 at the top of the casing 14 which surrounds the member 12. Thus, the dust which is centrifugally separated against the air casing 12 is conveyed to the top of that member where it whirls out into the top of the encompassing dust extending transversely of saidV stack, 'heat i conserving means for accepting the heat from saidscreen, and a dust catcher positioned above and defended by said screen.

2. A stack, incombination with a heat absorbing screen at the top thereof, a blast box there positionedto accept the heat from said screen, and meansforsupplying air to said box and also for conducting the heated air from said, box.

In testimony whereof I have hereunto set 1 my handthis 9th day of March, A. D. 1926.

CHARLES GILBERT HAVVLEY.

pocket 15, while the clear gases depart 'l discharge of the collected dust. Usually sev- .y eraldown pipes 19 extend therefrom to one or more dust pockets 2O suspended beneath the charging floor A. That floor having been pointed out the lines B are identified as belonging to the roof of the cupola house.

It is believed the foregoing description will make it clear that such dust as may rise from the cupola with the gases is intercepted by the described dust catcher, second, that the heat of the gases is utilized with great advantage at the base of the cupola, and that third the means employed for absorbing the otherwise waste heat serve to prevent destructively high temperatures within the dust catcher; and all without detrimentally affecting the draft of the cupola or other stack.

Various modifications of my invention will readily suggest themselves to those skilled in the art and it is to be understood that the i invention is by no means limited tothe preclse structures herein shown and described.

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