US721698A - Smoke-consuming furnace. - Google Patents

Description

N0. 721,698. PATENTED MAR. 3, 1903. y J. B. HARRIS.

SMOKE GONSUMING FURNACE.

APPLICATION FILED APR. 2, 1902.

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No. 721,698. PATENTED MARJ3, 1903.

\J. B. HARRIS. SMOKE GONSUMING FURNACE.

APPLIQATION FILED APR. 2, 1902- 3 SHEETS-SHEET 2 Emit; iwfiiin q M M ii: I r mi Emmi? V w r mum 3:; i .Z n .DDDU 7 w 1:": WI 4/ mw fl m/W Um i: q L Uu 51 n n n n u n n u u n W m 2 T H ununuumnn w v N, 2F 2K l u u o o o n o0 o o u a u o no J. B. HARRIS. sMoKE GONSUMING FURNAG APPLICATION FILED APR. 2, 1902. a SHEETS-SHEET s Q I I WITNESSES: a Q

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UNITED STATES PATENT OFFICE.

JOHN BROWN HARRIS, OF NASHVILLE, TENNESSEE. I

SMOKE-CONSU MING FURNACE.

EPECIFICATION forming part of Letters Patent N 0. 721,698, dated March 3, 1903. Application filed April 2, 1902. Serial No- 101,069. (No model.) A

description.

The invention relates to furnaces for use on boilers, stoves, open fire-grates, kitchen stoves and ranges, and the like; and its object is to provide a new and improved smoke-consunning furnace which is simple and durable V in construction, very efiective in operation, and arranged to utilize the units of heat contained in the fuel to thefnllest advantage to insure complete combustion. v

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a sectional side elevation of the improvement as applied to a stove. Fig. 2 is an enlarged sectional plan view of the same on the line2 2 of Fig. 1. Fig. 3 is an enlarged sectional side elevation of the filling-chute, parts being in a different position. Fig. 4 is a front elevation of the improvement as applied to an open fire-grate, parts being broken out. Fig. 5 is a transverse section of the same on the line 5 5 of Fig. 4:. Fig. 6 is a longitudinal sectional elevation of the improvement as applied to a boiler. Fig. 7 is a sectional plan view of the same on the line 7 7 of Fig. 6, and Fig. 8 is a transverse section of the same ontheline 8 8 of Fig. 6.

The stove or heater illustrated in Figs. 1 2, and 3 consists, essentially, of a fire-box A, preferably made in the form of an inverted frustum of a cone, opening at its apex end into the ash-pit B, the top plate A of the said fire-box beingprovided with a central opening A leading into the combustionchamber 0, having an opening 0 in its crown to conduct the heat arising from the burning fuel in the fire-box A into a shell D, concentrically surrounding the combustion-chamber O-and connected at its lower end with the chimney-flue E, the upper end of the said shell having a damper connection F with the saidchimney-fiue E to produce adirect draft in the combustion-chamber on starting the fire in the fire-box A. The damper connection F is closed after the fire is started in the In the fire-clay wall of the fire-box A is arranged a hot-air-supply pipe G, preferably in the form of a coil and having its lower end G extending to the outside of the heater, the outer end being preferably provided with a valve H to open the pipe end G to the atmosphere or to close the said pipe end whenever desired. The inner end of the supplypipe G opens into an annular chamber I, formed in the top plate A of the fire-box A, and the said annular chamber I is connected by inwardly-extending radial branch pipes J with the lower ends of vertically-disposed perforated pipes K, arranged in a circle and somewhat spaced apart, as plainly indicated in Fig. 2, the perforations in the tubes K extending on the lateral faces thereof, so as to cause the hot air topass into the path of the smoke and gases arising from the firebox A through the central opening A as indicated by the arrows in Fig. 2. The perforated tubes K support at their upper ends a deflector-plate L to cause the heat to spread in'the lower portion of the combustion-chamber C before passing to the crown outletopeuing C. The fuel isintroduced into the .fire-box A through a ohuteN, extending in an inclined direction from the top plate A through the lower portion of the combustionchamber 0 and shell D, the outer end of the said chute being normally closed by a cap 0 in the shape of a scoop and hinged at O to the bottom of the chute, at the upper end thereof. The cap 0 is connected by a linkP with a gate Q, hung at its upper end'at Q" in the chute N, so as to close the latter at the time the cap 0 is open, and when the cap is swung into a closed position the link P swings the gate Q open, as indicated inFig. 1. Now in order to charge the fire-box with fuel the latter-is placed into the open cap 0, (see Fig. 3,) and then the cap is swung into a closed position, as shown in Fig. 1, so that the fuel slides down the chute N into the fire-box loo without any danger of cold atmospheric air passing into the fire-box during the introduction of the charge into the fire-box.

In starting the fire in the fire-box the valve H is closed and the damper F is opened, and after the fuel is burning in the fire-box the damper F is closed and the valve H is opened, so that atmosheric air passing through the pipe G becomes heated, as the pipe is heated from the burning fuel in the fire-box heating the wall thereof. The heated air from the pipe G passes into the annular chamber I and through the branch pipes J, so as to be heated to a still higher degree, the highlyheated air finally passing through the perforations in the tubes K to the smoke and gases arising through the opening A so that a complete combustion of the smoke and gases takes place in the combustion-chamber O by the introduction of the highly-heated air. The heat now passes through the crown-opening 0 into the shell D and down the latter around the outside of the combustion-chamber G, to finally pass into the chimney-flue E.

From the foregoing it is evident that the air is highly heated in its passage through the pipe G, annular chamber 1, and branch pipes J, so that the hot air readily produces complete combustion of the rising smoke and gases to insure full utilization of all the units of heat contained in the fuel in the fire-box A.

In the modified form shown in Figs. 4 and 5 the hot-air-supply pipe G is arranged in the wall R of the open grate having the firebox A the ash-pit B, and the combustionchamber 0 leading at its upper end into the chimney-flue E. The lower end of the pipe G has an outward extension G containing a valve H, and the upper end of the pipe G opens into a chamber I, arranged in the wall R, and from the said chamber I extend the perforated tubes K in a transverse direction and within the upper end of the combustionchamber 0 so that the heated air passing out of the perforated tubes K comes directly in contact with the smoke and gases rising in the fire-box and combustion-chamber C so that complete combustion of the smoke and gases takes place by the introduction of the hot air.

In the modified form shown in Figs. 6, 7, and 8 the hot-airsupply pipe (l is arranged in the brickwork S, supporting the boiler T, one end G5 of the pipe opening to the atmosphere and the other end opening into a chamber I in the form of a coil of pipe, arranged in the top of the bridge-wall, located in the rear of the fire-box A, as plainly indicated in Fig. 6. From the chamber I extend the perforated tubes K so that the heated air issuing through the perforations in the tubes K comes in direct contact with the smoke and gases passing over the bridge-wall through the combustion-chamber C to finally pass through the boiler-fines, the heat in passing through the combustion-chamber C heating the pipe G", so that the air is highly heated at the time it leaves the tubes K As indicated in Fig. 6, the pipe G4 is arranged in the shape of a coil, forming part of the bottom and rear of the combustion-chamber. In all cases it is understood, however, that atmospheric air is heated and is charged into the smoke and gases arising from the burning fuel in the fire-box to cause complete consumption of the smoke and gases and produce a high heat.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. A smoke-consuming furnace, compris ing a fire-box, a coiled hot-air pipe arranged in a Wall of the furnace and heated by the burning fuel in the fire-box, said pipe opening at one end into the open air, an air-chamber arranged in a wall of the furnace and into which the other end of the hot-air pipe opens, said chamber having oppositely arranged and spaced portions forming an opening between said portions at right angles to the passage of the chamber, and oppositely-arranged and perforated pipes projecting from the said portions of thechamber, as set forth.

2. A smoke-consuming furnace, comprising a fire-box, a combustion-chamber, an airpipe in the wall of the fire-box, opening at one end into the open air, an annular chamber between the fire-box and the combustion-chamher, into which opens the other end of the said air-pipe, and perforated tubes rising in the combustion-chamber and connected with the said annular chamber, as set forth.

3. A smoke-consuming furnace, comprising a fire-box, a combustion-chamber, an airpipe in the wall of the fire-box, opening at one end into the open air, an annular chamber between the fire-box and the combustion-chamber, into which opens the other end of the said air-pipe, perforated tubes rising in the combustion-chamber and connected with the said annular chamber by branch pipes, and

a deflector-plate on the top of the said tubes, as set forth.

4. A smoke-consuming furnace, comprisinga fire-box, a combustion-chamber connected with the fire-box by a central opening in *the top plate of the fire-box, a hot-air pipe in the wall of the fire-box, opening at one end into the open air and at its other end into an annular chamber formed in the said top plate, and perforated tubes concentric to the said central opening, connected by branch pipes with the said annular chamber, as set forth.

5. A smoke-consuming furnace, comprising a fire-box, a combustion-chamber connected with the fire-box by a central opening in the top plate of the fire-box, a hot-air pipe in the wall of the fire-box, opening at one end into the open air and at its other end into an annular chamber formed in the said top plate, and perforated tubes concentric to the said central opening, connected by branch pipes pipes extending in the said top plate, asset forth.

6. A smoke-consuming furnace, comprising a combustion-chamber, a fire-box, in the form of an inverted frustum of a cone and provided with a top plate having a central opening leadingto the combustion-chamber, an annular chamber, and radial pipes extending inwardly from' the said. chamber, a plu-.

rality of perforated tubes projecting into the combustion-chamber and arranged around the central opening of the top plate of the fire-boxfthe lower ends of the tubes being connected with the radial pipes, a deflectorplate on the'upper end of the'perforated tubes,

- and a pipe coiledin the wall of the fire-box 1 and having one end connected with the said annular chamber and its other end opening into the open air, as set forth.

7. A smoke-consuming furnace, comprising a fire-box having a coiled pipe arranged in its wall, and provided with a top plate having a central opening, an annular chamber with which the other end of the coiled pipe is connected, and branch pipes leading'inwardly from the annular chamber, a combustionsame, having a hinged gate and a'hinged fuel receiving scoop-shaped cap, the gate and cap being connected with eachother and arranged to close the gate on swinging the cap open,

and to open the gate on closing the cap, to dump the contents thereof into the chute, as set forth.

In testimony whereofl have signed my name to this specification in the presence of two subscribing witnesses.

JOHN BROWN HARRIS.

Witnesses:

F. A. DRAPER, R. H. NEAL.

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