US754999A - Smoke-consuming furnace. - Google Patents

Description

No. 754.999. PATEN'IED MAR. 22, 1904.

J. B. HARRIS. SMOKE GONSUMING FURNAGE.

APPLICATION FILED MAR. 27, 1903. no MODEL. I 4 sums-sans! 2.

'PATENTED MAR. 22, 1904.

J. B. HARRIS. SMOKE GONSUMING FURNACE.

APPLIOATION FILED MAR. 27, 1903.

4 SHEETS-3811331 4.

NO MODEL.

//v VENTOH Jain/M2222;

E y I umummmmuuuulmmuunu ll n II [II I u n n n n n I A 770/?NE VS.

WITNESSES line 3 3 of Fig. 1.

UNITED STATns Patented March 22, 1801.

ATENT FFICE.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 754,999, dated March 1904.

Application filed March 27, 1903.

To all whom it may concern:

Be it known that I, J OHN BROWN HARRIS, a citizen of the United States, and a resident of Nashville, in the count-y of Davidson and State of Tennessee, have invented a new and Improved Smoke-Consuming Furnace, of which the following is a full, clear, and exact description.

The invention relates to smoke-consuming furnaces such as shown and described in the Letters Patent of the United States N 0. 721,698, granted to me -March 3, 1903.

The object of the present invention is to provide a new and improved smoke-consuming furnace arranged to insure a complete combustion of the fuel in the fire-box and combustion-chamber by the introduction of heated air into the front top portion of the fire-box and into the combustion-chamber at the bridge-wall.

-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 inventioni 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 1 is a longitudinal sectional elevation of the improvement as applied to a horizontal tubular boiler, the section being on the line 1 1 of Fig. 2. Fig. 2 is a transverse section of the same on the line 2 2 of Fig. 1. Fig. 3 is a similar view of the same on the Fig. 1 is a longitudinal sectional elevation of the improvement as applied to a water-tube boiler, the section being on the line 4 40f Fig. 5. Fig. 5 is a crosssection of the same on the line 5 5 of Fig. 1, and Fig. 6 is a similar view of the same on the line 6 6 of Fig. 4:.

A boiler A is set in the usual manner in brickwork B containing a fire-box C, having a grate D, below which is arranged an ash-pit E, access to which and to the fire-box C is had by suitable doors E and C. At the rear end of the fire-box C is arranged a bridge-wall F, having its top in an inverted-arch shape and spaced from the under side of the boiler A to Serial No. 149,315. (No model.)

form a combustion-chamber Gr, the rear end of which leads to the rear end of the boilerA for heated gases to pass to and through the flues of the boiler A in ,a forward direction and to finally pass into a stack A.

In the front upper portion of the fire-box C is arranged an air-chamber H, formed by spaced concentric arches H and H extending from the side walls of the brickwork B, the top of the outer arch H being spaced from the under side of the boiler A to leave the latter unobstructed at this point, and thus maintain a full heating-surface of the boiler throughout the length thereof. The lower arch H extends above the door C, so as not to obstruct the entrance to the fire-box O.

In the air-chamber H are arranged air-retarding devices, preferably in the shape of checker-bricks H to retard the air in the said chamber H to insure heating thereof to a high degree previous to the heated air passing into the fire-box above the burning fuel on the grate D.

i The inner end of the upper arch H projects a distance beyond the inner end of the lower arch H so that the heated air passing from the chamber H at the inner open end is guided end thereof, are connected with air-ducts I,

extending rearwardly in the side walls of the brickwork B, to lead to the outer air at the back wall of the brickwork, and the rear ends of the said ducts I are adapted to be opened and closed by suitable hinged doors J each connected by a chain J with a bell-crank lever J fulcrumed on the top of the brickwork B, and connected by a link J with another bell-crank lever J arranged on the front of the brickwork B, and this bell-crank lever J 4 is provided with a depending handled chain or rope J 5 under the control of the operator. Thus when pulling the chains J 5 the doors J are swung open, so as to allow air to pass through the ducts I into the heating-chamber H and from the latter into the fire-box, it being understood that the air during its passage through the ducts I receives a preliminary heating, and this heated air is heated to a very high degree in the chamber H before it passes into the fire-box A.

A second air-chamber K is formed in the bridge-wall F, and this chamber leads to the inverted arched top of the bridge-wall, and on this top are arranged longitudinally-extending bricks K, spaced apart to form openings K for the air to pass from the chamber K,through the said openings, into the combustion-chamber Gr. (See Fig. 3.) To the bottom of the chamber K leads a door K for the convenient removal of ashes and cinders that may fall into the chamber K through the openings K Into the chamber K also open the forward ends of air-ducts L, built on the inner face of the side walls of the brickwork B, and the rear ends of the said ducts L connect by branch ducts L in the back wall of the brickwork B with ducts L extending forwardlyin the side Walls of the said brickwork B. The forward ends of the ducts L are adapted to be opened and closed by doors N, similar to the doors J and under the control of the operator by the employment of chains or ropes N, each of which is attached at one end to a corresponding door and then extends upward over a pulley N journaled on the top of-the brickwork B. The depending front end of the chain or rope N is adapted to be taken hold of by the operator, so that the latter on pulling the rope swings the corresponding door N into an open position to allow atmospheric air to pass into the front end of the duct L to travel rearwardly therein and to finally pass by the branch duct L into the duct L to finally reach the air-chamber K in the bridge-wall F.

Now it will be seen that the air in its rearward and forward passage in the ducts L L, and L receives a preliminary heating and a final heating to a high degree in the chamber K to pass in this condition through the openings K into the combustion-chamber G. In the latter are arranged checker-bricks O to somewhat retard the rearward flow of the smoke and gases and to cause a thorough intermingling of the air with the gases to insure complete combustion. As indicated in Fig. 1, at the front end the checker-bricks O are set in step form, so that the air and gas are caused to travel in an upward direction toward the under side of the boiler A to thoroughly heat the same.

Now from the foregoing it will be seen that when the fuel is burning on the grate D and the doors J and N are opened then air passes through the ducts described into the airchambers H and K, and the heated air in the chamber H passes directly into the smoke and gases arising from the fuel on the burning-grate D, so as to insure combustion of the gases and reduction of the smoke, and the mixture in passing over the bridge-wall F comes in contact with a fresh supply of highly-heated air from the chamber K, and

this air is thoroughly mixed with the smoke and gases in the combustion-chamber G, es-

pecially by the aid of the checker-bricks O, to

insure a complete combustion previous to the heated gases leaving the said combustionchamber and passing through the boiler A into the smoke-stack A.

In water-tube boilers A as shown in Figs. 4, 5, and 6, the arrangement is similar to that above described in reference to the horizontal tubular boiler A, it being understood that the boiler A is set in the usual manner in the brickwork B and the heating-chamber H* is arranged in the front upper portion of the fire-box C while the heating-chamber K is arranged in the bridge-wall F, and the said chambers H and K* have ducts I and L, the

entrances to which are controlled by doors J and N, as plainly indicated in Fig. 4. The checker-bricks O in the combustion-chamber G are arranged in a slanting condition to conform to the inclination of the boiler-tubes, but have the same relation to the spaced bricks K forming the outlet-openings K for the heated air from the heating-chamber K; but instead of having the top of the bridge-wall F in an inverted-arch shape it is perfectly straight, as will be readily understood by reference to Fig. 6.

The operation is the same as above described in reference to the horizontal tubular boiler, so that further description of the same is not deemed necessary.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent 1. A smoke-consuming furnace, comprising a fire-box, air-chambers for delivering heated air to the smoke and gases arisingfrom burning fuel in the fire-box, one of the air-chambers being arranged in the front top portion of the fire-box and the other in the bridge-wall in the rear of the fire-box, an air-duct extending in the side wall of the furnace and leading from the said front air-chamber to the rear end of the furnace and opening into the outer air, and a second air-duet in the side wall of the furnace, leading from the bridge wall chamber to the rear of the furnace and to the front thereof and opening into the outer air, as set forth.

2. A smoke-consuming furnace, comprising a fire-box, air-chambers for delivering heated air to the smoke and gases arising from burning fuel in the fire-box, one of the air-chambers being arranged in the front top portion of the fire-box and the other in the bridgewall in the rear of the fire-box, air-ducts ex-- end of the furnace and opening into the outer air, as set forth.

3. In a smoke-consuming furnace, a firebox having a grate, an air-chamber in the front top portion of the fire-box and formed of spaced arches, said chamber extending horizontally partially over the grate, and air-ducts leading from the said chamber to the rear end of the furnace and opening into the outer air, as set forth.

4. In a smoke-consuming furnace, a firebox having a grate, an air-chamber in the front top portion of the fire-box and formed of spaced arches, the upper one of which projects beyond the lower one, said chamber extending horizontally partially over the grate, and air-ducts leading from the chamber to the rear end of the furnace and opening into the outer air, as set forth.

5. In a smoke-consuming furnace, a firebox having a grate, an air-chamber in the front upper portion of the fire-box and formed of spaced arches, the upper one of which pro jects beyond the lower one, said chamber extending horizontally partially over the grate, and filled with retaining devices in the form of checker-bricks, air-ducts leading from the chamber to the rear of the furnace and opening into the outer air, and doors for said ducts, under the control of the operator, as set forth.

6. A smoke-consuming furnace provided with a fire box, a combustionchamber, a bridge-wall in the rear of the fire-box, an airchamber in the bridge wall, bricks spaced apart on the top of the chamber, to form spaced top openings for the escape of the air from the said air-chamber into thesaid comthe check-bricks being arranged in step form,

as set forth.

8. A smoke-consuming furnace provided with a fire-box, a combustion-chamber having retarding means therein, a bridge-wall in the rear of the fire-box, an air-chamber in the bridge-wall, bricks spaced apart on the top of the chamber, to form spaced top openings for the escape of the air from the said air-chamber into the said combustion-chamber, and air-ducts opening into the said air-chamber and extending first rearwardly, along the side walls of the furnace, to then connect by branch ducts in the back of the furnace with longitudinal ducts arranged in the side walls of the furnace, and opening to the outer air at the front of the furnace, as set forth.

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

JOHN BROI/VN HARRIS.

Witnesses:

ADAM GEBI-IARDT, GRACE DAWSON.

Images