US691398A - Steam-boiler furnace. - Google Patents

Description

Patented Ian. 24, I902.

T., a. m-Acv. STEAM BofILEB FURN'AQE.

(Application filed Mar. 23, 1901.)

2 Sheets-Sheet I.

(No Model.)

No. 69l,398. Patented Ian. 2|, I902.

T. a: mAcY. STEAM .BUILER FURNACE. (Application filed Mar. 23 1901.) (No Model.) 2 Sheets-Sheet 2,

' wax/ 4 UNITED STATES PATENT OFFICE.

THOMAS e. MAcY, or NEW YORK, N. Y.

STEAM-a-BO IL ER FURNACE.

SPECIFICATION forming part of Letters Patent No. 691,398, dated January 21 1902.

Application filed March 23, 1901. Serial No. 525513. (llo model.)

To all whom it may concern:

Be it known that I, THOMAS G. MACY, a citizen of the United States,residing at New York, borough of Manhattan, county and State of New York, have invented certain new and useful Improvements in Steam-Boiler Furnaces, of which the following is a specificasupplied by means of a suitable blower and having communication with one'or more parts of the furnace for drawing in the unconsumed combusible gases from the furnacespace in rear of the bridge-wall and from the forward end of the smoke-fines of the boiler and injecting said unconsumed gases into the fire-box and combustion-chamber of the furnace together with the air from the blower with which the gases are intimately mixed, so that the intimate mixture of said combustible gases and air will be consumed by the fire. The result of this arrangement will be the more perfect combustion of the fuel-and the prevention of smoke.

More specifically, my invention consists in a peculiar construction of injector for effecting the above-stated result. 1 provide upon the sides of the fire-box of the furnace and upon the sides of the ash-pit double conduits for the passage, respectively, of the currents of air from the blower and for the passage of the smoke and combustible gas drawn in from the different parts of the steam-boiler furnace, and from these double conduits at various points I provide injectors formed of asbestos and fire-clay. The injectors are arranged to direct the commingled air and combustible gases into the tire from beneath and above the grate.

In order that my invention may be fully understood, 1 will first describe the same with reference to the accompanying drawings and will afterward point out the novelty with more particularity in'the annexed claims.

In said drawings, Figure 1 is a vertical longitudinal sectional view of a steam-boiler furnace equipped with my improvements. Fig. 2 is a detail horizontal sectional View of the fire-box and combustion-chamber of the furnace. Fig. 3 is an enlarged detail horizontal sectional view of the fire-brick conduit and gas-conduit and one of the injectors. Fig. 4 is a detail front view of one of the injectors.

1 is a steam-boiler having the usual smokeflues (not shown) supported in a furnace of any suitable construction, of which 2 is the fire-box, having door 3. 4 is theash-pit, having door 5. 6 is the bridge-wall. 6 is the combustion-chamber. 7 is the space leading to the boiler-fiues,and 8 is the smoke-chamber, into which the boiler-flues lead at the forward end of the furnace. v

Arranged on each side of the fire-box 2 and combustion-chamber 6 of the furnace is an [upper flue orrconduit 10, formed of vitrified hollow brick. This flue or conduit 10 is located above the bridge-wall and communicates at 'its forward end with the intake branch pipe 11 of a blower-pipe 12, leading from a blower 13 of any suitable construction located above the smoke-chamber 8. 14. is a valve in the branch pipe 11 for controlling the supply of air to the conduit 10 from the blower.

Arranged between the upper conduit 1 0 and the fire-box of the furnace is a conduit 15 for the passage .of smoke and combustible gases. This conduit 15 has an intake-opening at 16, covered by a suitable screen to prevent the passage of soot and dirt. The intake-opening 16 is located in the combustionchamber 6* between the bridge-wall of the fire-box and the furnace-dues. The conduit 15 also has a vertical branch 17 leading from the smoke-chamber 8 at the forward end of the boiler, the open end of said branch 17 being covered by a suitable screen 19 to prevent the passage of soot and dirt.

Extending from the air-conduit 10 inwardly A have contracted ends 20, fitting snugly in openings in the conduits 10. The injector pipes or tubes 20 extend across the conduit and into the side walls of the fire-box, and they are surrounded within the side walls by rectangular pipes or tubes 25, integrally connected with the pipes by webs 26 and forming around the pipes 20 passage-ways 27 in the side walls for the passage of the smoke and combustible gases drawn through the conduit 15.

Arranged beneath the fire-box 2 in the side walls of the ash-pit 4 are the injectors 30, communicating with the lower air-conduit 10, connected at its forward end to the branch air-supply pipe 31, having a controlling-valve 32 and leading from the blower supply-pipe 12. The injectors 30 have communication with a lower air-conduit 35, leading from an intake 36, covered by a screen and located at a point behind the bridge-wall 6 for the purpose of drawing from the combustion-chamber combustible gases in the same manner as above explained in connection with the injectors which lead to the fire-box and combustionchamber.

The operation of my improved furnace will be clear with but slight explanation. Then the furnace is operating, a blast of air is supplied from the blower 13 to the branch supply-pipes 11 and 31 and the pipes or conduits 10 and 10. The air-blasts pass through the injector pipes or tubes into the fire-box and combustion-chamber or beneath the gratebars, as the case maybe, and create a suction in the gas-supply conduits 15 and 35, into which the combustible gases are drawn from the combustion-chamber and from the smokechamber 8. The combustible gases so drawn in are intimately mingled with the blasts of air and the mixture of air and combustible gases is injected into the fire, where it is eifectively consumed.

The lower series of injectors located in the side walls of the ash-pit are used only when it is desired to have a forced draft for the furnace.

A very important feature of my invention is the construction of the injectors of asbestos and fire-clay and the construction of the conduits of fire-brick, whereby the life of the structure is prolonged. The importance of my invention depends upon the well-recognized fact that the more intimate themixture of air or oxygen with the combustible gases of a fire the more nearly perfect will be the resulting combustion.

Having thus described nay-invention, the following is what I claim as new therein and desire to secure by Letters Patent- 1. The combination of a furnace comprising a bridge-wall, a fire-box, a combustion-chamber, side walls, having gas-conduits, and intakes to the gas-conduits at the combustionchamber in rear of the bridgerwall, air-conduits located in the gas-conduits, and series of transverse injectors formed with outer tubes fitting in openings in the side walls of the furnace with inner tubes extending across the gas-00nd nits and partly through the outer tubes leaving commingling-spaces at their outer ends with contracted inner ends fitting in openings in the air-conduits, and with webs supporting the inner tubes in the outer tubes, ablower and pipes connecting the blower with the air-conduits.

2. The combination of a furnace comprising a bridge-wall, a fire-box, a combustion-chamher, side walls having gas-conduits and intakes to the gas-conduits at the combustionchamber in rear of the bridge-wall, air-conduits located in the gas-conduits, and series of transverse injectors connected with the air-conduits, a boiler having smoke-fines, a smoke-chain ber at the forward end of the boiler, vertical smoke-pipes connecting the smoke chamber with the gas conduits, a blower and pipes connecting the blower with the air-conduits.

3. The combination of a furnace comprising a bridge-wall, a fire-box, a combustion-chamber, side walls having upper and lower gasconduits and upper and lower intakes at the combustion-chamber, in rear of the bridgewall, air-conduits located in the gas-conduits, and series of transverse injectors connected with the air-conduits, a boiler having smokefiues, a smoke-chamber at the forward end of the boiler, vertical smoke-pipes connecting the smoke-chamber with the upper gas-conduits, a blower and pipes connecting the blower with the upper and lower air-conduits.

THOMAS G. MAOY.

\Vitnesses:

WM. E. KNIGHT, J. GREEN.

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