US277361A - slater - Google Patents

Description

2 Sheets-Sheet 1.

(No Model.)

R.L.SLAT-BR. STEAM BOILER PURNAGB.

Patented May 8, A1883.

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STEAM BOILEB PURNAGB. No. 277,361; Patented May 8,1883.

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UNITED. STATES PATENT OFFICE.

RICHARD L. SLATER, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO PERKINS H. BAGLEY, OF SAME PLACE.

STEAM-BOILER F'URNAGE.

' SPECIFICATION forming part of Letters Patent No. 277,361, dated May 8, 1883.

` vApplication tiled January 4, 1883. (No model.)

To all whom 'it may concern:

Be it known that I, RICHARD L..SLATER, residing at San Francisco, in the county of San Francisco and State of California, have invented certain new and useful'Improvements in Steam-Boiler Furnaces, of which the following is a specification.

My invention relates to improvements in the construction of furnaces adapted for the heating of steam boilers placed above the flame and combustion -chamber and the objects of my invention are, first, to provide afurnace with means whereby the draft and degree of heat may be greatly increased and the combustion of the gases and vapors arising from the burning' fuel may be accomplished; second, to provide a means whereby thin streams.

of vital heated air may be discharged into the com bustion-chain ber above the bed of bu-rning fuel, and al'so to certain details of construction, which will be more fully described hereinafter. I attain'these objects by the means illustrated in the accompanying drawings, in which- Figure lis a cross-sectional view of a furnace embodying my improvements. Fig. 2 is a perspective view of one of the grooved bricks. Fig. 3 represents a modied form of brick. Fig. 4 is a longitudinal section through the tire-box, taken on line X X of Fig. l.

Similar letters are used to designate like parts throughout the several views.

A A represent the steam boilers of a double furnace; B B, the side walls, and C the bridge-wall, ofthe combustion-chamber. Ihc

front, bridge, and side walls are made hollow, or with a chamber, D, extending throughout their entire length and from below the line of grate-bars to any convenient height above them. A series of perforations or holes, E, are made in the fire'face of the walls, and commnnicate with the chamber D near the lower edge or base thereof. Near the upper end of the chamber I make one or more series of perforatious, F, whichcommunicate with the tirebox at any convenient height above the bed of coal upon the grate-bars G. At or near the center of the combustion-chamber, and extending from the front to the bridge-wall, I ereeta partition-wall, H, which extends up to or above the top of the bridge-wall, and thus divides the tire-box into two compartments, and, in furnaces where double boilers are used, causes an equal amount of heat and flame to pass under each boiler. The wall H is made hollow, as shown in Fig. 1, and its chamber I is provided with apertures J and K at the top and bottom, which communicate with the combustionchamber above and the ash-pit below the gratebars. Near the center of each 6o subdivision of the combustion-chamber I lay upon and boltto the grate-bars a strip of casting, L, which extends throughout the length of the tirebox, and is sufficiently wide to lap the top faces of two adjacent grate-bars. This casting carries a series of vertical pipes, M, which extend a short distance Within the ashpit, and are sufficiently high to clear the bed of burning fuel. The door N of the lire-box is also made hollow, or with a chamber, O, having at its base an opening, P, communicating with the outer air, and at the top the openings Q, communicating with theinterior of the rebox. A series of air pipes, R, are passed through the front wall, S, and extend with a slightly-downward curve into the nre-box, as Shown in Fig. 4. Theoor T of the ash-pit is to be provided with the usual ventilator, and there may be other ventilators let into the front wall, if found 8o desirable. The air which enters the ash-pit f will be drawn up through and rbetween the grate-bars, and will keep the lower portion of the fuel in a steady blaze. A portion will also enter the pipe M, and will be discharged into the lire-box above. Another portion will enter the hollow walls, and, after being heated by contact therewith, will be discharged into the combustion-chamber above the bed of fuel, and by mingling with the gases, vapors, and unburned products of combustion will thereby supply them with an increased supply of oxygen, and thus insure their almost total con# sumption and greatly increase the effectiveness ot' the fuel by supplying av larger per- 95 centage of live air to the burning coal 'than has heretofore been done without the aid of a fan-blower. The openings inthe doors of the lire-box and the pipes R in the front lwall supply-air directly from the outside without beloo ing first heated in the ash-pit, and their main oflce is simply t augment the supply of vital air.

The bricks Y, which form the courses where the inner air-'openings appear in the furnace walls or hinges, are made in the form shownthat is to say, upon one side I make three semicircular recesses, Z 5 but the outer recesses may be made on the edge ot the brick, and only onequarter round, as shown at Fig. 3. These recesses are given a taper from the outside to theinside end, so as Jto-concentrate the currents of air ilowing through them. The brick are laid in a course with the recessed face uppermost. The next course is then laid on with the recessed face downward, and thus by the two halves coming opposite each other a tubular aperture is formed.

Having-thus described my invention, what I claim, and desire to secure by Letters Patent, 1s-

In a steam-boiler furnace, the combination of the boilers A A, side walls, B B, and bridgewall C, formed with an airchamber,D, extending from the ash-pit to the fire-chamber, and provided with openings E F, the hollow partition-wall H, provided with openings J K, the gratebars G L, air-pipes M R, and the hollow furnace-door N, having openings P Q, as and for the purposes described.

In testimony that I claim the foregoing I have hereunto set my hand and seal.

RICHARD L. SLATER. '[L. s]

Witnesses:

WlLMER BRADFORD, GHAs, E. KELLY.

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