US421589A - to john mcmillan - Google Patents

Description

(No Model.) 2 Sheets-Sheet l.

W. LAWRIE 8v J. MCMILLAN.

PURNAGB.

110.421.589. Patented Feb. 18,1890.

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UNITED STATES APATENT OFFrcE.

VILLIAMLAWRIE AND J OI-IN MCMILLAN ASSIGNORS, BY IWIESNE ASSIGNMENTS, SAME PLACE.

, OF PETROLIA, ONTARIO, CANADA, TO JOHN MCMILLAN, TRUSTEE, OF

FU RNACE.

SPECIFICATION forming part of Letters Patent N o. 421,589, dated February 18, 1890.

Application filed J auuary 2.4, 1889. Renewed January 13, 1890.' Serial No. 336,718. (No model.)

To all whom it may concern'.-

Be it known that we, VILLIAM LAWRIE and JOHN MCMILLAN, citizens of the Dominion of Canada, residing at Petrolia, in the county of Lambton and Province of Ontario,

Canada? have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

Our invention relates to that class of fur- Io naces designed moreparticularly forburning gas or liquid fuel 5 and it consists in a novel construction and arrangement of the iiues thereof, whereby the combustion is rendered thorough.

In the accompanying drawings, Figure l is a front face view of our improved furnace; Fig. 2, a transverse vertical sectional view of the same; Figs. 3, 4, 5, and 6, horizontal views on the lines w y y, z e', and w w, respect- 2o ively; and Fig. 7, avertical longitudinal sectional view through the center of the furnace on the line 7 7.

While in the drawings we have shown the invention as applied to the heating of a z 5 steam-boiler, it is apparent that it is also applicable to oil-stills, whether horizontal or vertical, or lfor any other purposes where high temperature is required. v

In carrying out our invention we heat the 3o air before admitting it to the combustionchamber, and also superheat the steam by which the hydrocarbon gas or other liquid fuel is injected, thereby insuring a thorough commingling of the particles of air, steam,

3 5 and oil or gas, and a consequent economization of fuel and the production of an intense heat.

A indicates the furnace as a whole, provided at its rear with an opening or inlet B.

4o Extending along the iioor parallel with the side wallsA of the furnace are partitions C C, which extend nearly to the front wall of the furnace and terminate a short distance therefrom to form passages D, the said partitions O dividing the floor-space of the furnace into three chambers E, F, and G, as shown in Figs. 2, 3, and 7. The partitions C will be made of nre-brick or other heat-resisting substance, and the tops ofthe fines or passages E F G 5o thus formed will be made of fire-clay or other suitable material. Directly above'the passages or chambers E F Gare similarpassages H, I, and J, the first and last of which communicate with the iiues E and G at the rear end of the latter through openings K, formed by the roofs or covers of the ilues E G, stopping short of the rear end of the furnaces, as shown in Figs. 4 and 7. Directly over the partitions O are similar partitions L, which extend from the rear of the furnace-wall 6o nearly to the front and separate the chambers H, I, and J, except at the front end, where by forming recesses M inv the front wall of the furnace communication is established between the flues or passages HJ 'and 65 the central flue or passage I. It is not essential lthat the front Wall of the furnace be recessed, as sh'own in Fig. 4, as it is apparent that the partitions L may terminate a distance therefrom in a manner similar to the parti-V 7o tions O. (Shown in Fig. 3.)

The top of the combustionchamber I is covered by means of an arch N (shown in Figs. 2, 6, and 7) and communicates at the rear end of the furnace with the space bel neath the boiler by means of an opening O, formed through the arch, as shown in Figs. 6 and 7. From this arrangementit will be seen that the air entering at the rear end of the furnace through the central iiue F, passes for- Se ward to the front end thereof, thence through openings or passages D into the iiues E and Gback to the rear end of the furnace, up through openings K into the flues or passages H J, thence forward again to the front end of the furnace, thence, by means of passages Min the front wall of the furnace, into the front end of the central mixing-chamber I toward the rear end of the furnace, and finally up through the opening O into the 9o heating-chamber P.

The top of lthe flues H and J are provided with covers which extend from end to end of the furnace, thereby forming chambers or pockets Q, which are closed on all sides, as shown in Figs. 2 and 5.

R indicates a steam-pipe extending from the dome of the boiler into one of the pock ets or chambers Q, as shown in Figs. 2 and 5,

the said pipe traversing the length of the roo chamber one or more times and extending to the opposite side of the furnace, where 1t traverses in a similar manner the other pocket Q. After leaving the pocket Q the pipe passes out at the front Wall of the furnace and re-enters the same at the front end of the mixing or combustion chamber I, as shown in Figs. l, 4, and 7, Where it is provided with an injector-burner of any suitable construction, by means of which the liquid fuel or gas is injected into the mixing-chamber. It will be noticed from this construction that the steam will be highly superheated, and that as it issues from the pipe Q into the mixing-chamber I it will suck or draw in through the opening in the front end of said chamber a large quantity of air which has become heated by its circuitous travel through the flues E, F, G, I-I, I, and J. By making the mixingchamber I comparatively small the liame from the injector-burner is caused to impinge on the lire-brick or fire-clay linings or covers of the air-lines, thereby splitting up the hydrocarbon into minute particles and mixing it thoroughly with the heated air, tbc., and producing practically complete combustion and a saving of fuel over prior plans.

IVe are aware that it is not broadly new to cause the air to travel circuitously, and thereby become heated before being delivered into the combustioil-chamber.

Having thus described our invention, what We claim isl. In a furnace, the combination, With the central air-inlet flue F and the return-fines E G, communicating therewith, of the flues II J, located above and communicating with the rear ends of the flues E G, a mixingchainber I, located directly over the flue F an communicating at its forward end with the lues II J, a chamber I) above the chamber I, and an arch N, covering chamber I provided with an opening O, all substanf as shown. The furnace A, provided With central passage F, return-passages E G, communicating with passage F at the front of the Vfurnace by openings D D, dues or passages I-I I J directly above the llues E F G, openings K K, connecting th'e rear ends of the lues E' G and II J, and openings M M, connecting the passages II and J with the passage I at the front end of the latter, and

an outlet C) at the rear end of the passage I. 3. The furnace A, provided with the airinlet flue F, return-flues E, G, II, and J, eon

necting at alternate ends and causing a eircuitous travel of the air, the mixing-chamber I, receiving the heated air from the fines II J, and an injector-burner projecting. into 6o the end of the mixing-chamber, whereby the air, steam, and oil or gas are thoroughly mixed and perfect combustion secured.

Li. In a furnace, the combination, with the main body having an air-inlet B, of the short 6 5 partitions C C, dividing the floor-space in-to flues E, F, and G, the latter' E G connecting with the former F by passages D D, covers for said iiues E F G, partitions Il, dividing the space above the flues E F G into similar 7o flues II I J two of which II and J communicate with the line I and the flues E G, an outlet in fiue or chamberI, and an injector-burner extending into the chamber I, all substan tially as shown.

5. In a furnace for burning hydrocarbons or other liquid fuels, the combination, with the mixing-chamber I, of the closed pockets Q Q, and the steam-pipe passing throughsaid pockets and serving to deliver superhcated 8o steam to the injector-burner.

(. In a furnace, the combination, with the communicating passages E F G and II I J, ar-

ranged in two series, one above the other,

and having their walls made of nre-clay or 35 other heat-resisting substance, of the poele ets Q Q and the injector-burner extending into the chamber or passage I.

'7. In a furnace of the class described, the

combination, with the recessed front wall, of 9o the mixing-chamber I, provided 'with an opening in its front end and adischarge-opening at its rear, the air-fines on each side of the mixing-chamber communicating therewith,

and an injector-burner extending into the open end of the mixing-ehamber- S. In a furnace for burning liquid fuel or gas, the combination, with the mixing-chamber provided with an injector-burner and with openings around said burner, ol' a se` ries of fines or passages within the furnace communicating with the mixing chamber through the openings thercin,whereby heated air is delivered into the mixing-chamber.

In witness whereof we hereunto set our hands in the presence of two witnesses.

WILLIAM LAWRI'E. JOHN MCMILLAN. Witnesses:

1I. J. DAWSON, WM. J. CLARKE.

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