US695089A - Smoke-burning furnace. - Google Patents

Description

No. 695,089. Patented Mar. 11, I902.

J. E. CAVANAGH. SMOKE BURNING FURNACE.

(Application filed may 6, 1901.)

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jm. 695,089. Patented Mar. n, 1902.

J. E. CAVANAGH. v SMOKE BURNING FURNACE.

(Application filed may 6, 1901.)

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No. 695,089 Patented Mar. II, N902.

J. E. CAVANAGH. SMOKE BURNING FURNACE.

(Application filed m a. 1901.

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5,, turns JOHN E.

CAVANAGH, OF CLOQUET, MINNESOTA,

SMOKE BURNING FURNACE.

SPEGIFIOATIQN forming part of LettersPatent No. 695,089, dated March 11, 1902.

Application filed May 6, 1901. Serial No. 58,838. (No model.)

To (tZZ whom it rrtrty concern.-

Be it known that I, JOHN E. CAVANAGH, a citizen of the United States, residing at Gloquet, in the county of Carlton andState of Minnesota, have invented certain new and useful Improvements in Smoke-Burning Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide an improved steam-boiler furnace witha view of securing increased efficiency.

To this end my invention consists of the novel devices and combinations of devices hereinafter described, and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein like notations refer to like parts throughout-the several views.

In said drawings, Figure 1 is a view showin g the setting in vertical central section and the boiler chiefly in side elevation, with some parts broken away. Fig. 2 is a vertical crosssection on the line 00 a"? of Fig. 1. Fig. 3 is a vertical-cross-section on the line 03 00 0f Fig. 1; and Fig. a is a vertical cross-section on the same line as Fig. 2, but showing a modification in the construction of the fire-pot wherein a horizontal grate is employed instead of a grate with inclined sections.

The masonry setting 1 is of suitable form to support the return-flue boiler 2 and afford a rear-end extension or breech-chamber 3. The boiler 2 is provided with a front-end extension 4, having the stack 5. At its rear end the boiler-shell is tapped by a mud-leg 6,1eading to the mud-drum 7. From said muddrum 7 circulating-pipes 8 extend first upward and then lengthwise of the shell to the front-end extension 4 and then turn inward and tap the shell through the front-end flueplate. The circulating connections 8 are in pairs or sets of two each extending alongeach side of the boiler-shell at unequal heights, as best shown in Figs. 3 aud t. Of these circulating connections 8 three thereof tap the boiler each other.

the shell. This disposition of said circulating-pipes 8 insures a spiral motion to the wa ter within the boiler-shell under the heat from the furnace. This disposition of the circulating-pipes for securing the result above named, together with the resulting peculiar actions and advantages therefrom, are set forth in my pending application, Serial No. 55,611, filed April 13, 1901. The sections of the circulating-pipes 8 which extend lengthwise of the boiler-shell are disposed near to the shell, but are spaced apart a short distance therefrom.

The fire-pot has for its back the bridge-wall of the setting 1 and is provided with a front wall of any suitable construction with suitable doors properly located therein. The important feature of the fire-pot is the combination, with the grate, of segmental arches 9, converging inward from the side walls of the setting to the lower members of the circulat= ing-pipes 8 and abutting against the same at their upper end. These arches 9 are composed of refractory material, such as fire-tile, and when applied as above described flamepassages are afforded between the circulatingpipes 8, abutted thereby, and the boiler-shell.

In my preferred construction the grate-bars 10 are set at an angle to the horizontal plane, inclining downward from the arches 9 to the dead-plate 11 and are mounted for a rock ing motion. The dead-plate 11 has a base of metal and a face or body of refractory material, such as fire brick or tiling.

From the side walls of the setting 1 side arches 12 extend to a junction with the boilershell at a point above the center of the same. These arches 12 are preferably composed of two courses of refractory material (marked a and a and an outside course a of common brick. The inside course a is preferably a fire-tiling, and the intermediate course a is preferably of fire-brick, with these two courses so disposed as to break joints with The side arches 12 extend from the front end wall of the setting to the rear end wall of the same. The arches 9 extend from the back wall of the fire-pot or so-called bridge-wall of the setting to the front wall of the setting. Hence the arches 9 and 12, together with the side walls of the setting, cooperate to form large fines or flame-chambers 13, extending from the front end of the boilershell to the rear end or breech-chamber 3.

The arches 9 are shown as tapped by fuelfeed pipes 14, supplied from a mechanical stoker 15. The upper ends of the pipes 14 are subject to closures 16 under the control of a hand-lever 17, as shown in Fig. 1. This a mechanical stoker, however, may or may not be employed, as desired. The fuel may of course be supplied by hand through doors (not shown) in the front end wall of the firepot.

Having regard to the action, the chief feature for emphasis in this case is the more thorough combustion of the fuel. By combining with the grate the arches 9 of refractory material disposed as described I secure a smoke-consuming furnace. The combustion is so nearly perfect that no appreciable amount of carbon passes off with the gases and into the atmosphere through the stack 5. Under the action of the fire on the grate the arches 9 become heated to incandescence, and the burning gases on striking the same are successively reflected backward toward the grate, and under the intense heat produced from the burning fuel and the incandescent arches 9 complete combustion will be secured. The reflection from the boiler is also back downward onto the grate at an angle thereto, thereby causing redeflection toward the incandescent arches, and hence the cooling effect from the boiler-shell is counteracted by the repassage of the gases through the burning mass and their contact with the incandescent arches. In this Way, as I have demonstrated in practice, I secure almost perfect combustion. The flames and superheated gases on passing from the fire-pot completely envelop the circulating-pipes 8 and the sides of the boiler-shell in their passage rearward to the breech-chamber 3, at which point they enter the tubes of the boiler, thence out to the front end extension 4 of the stack 5. This course of travel is of such great length that substantially all the heat is utilized.

With this form of boiler and furnace I have found in practice that increased evaporation for any given unit of fuel can be secured.

With the form of grate shown in Fig. 2 the grate-bars would receive a rocking motion whenever necessary by suitable devices. (Not shown.) If the grate be horizontal, as shown in Fig. 4, the dead-plate would be disposed crosswise of the boiler and the sets of gratebars 10 would be applied lengthwise of the furnace. The grate might be of any suitable construction and provided with any suit-able means for cleaning the same.

What I claim, and desire to secure by Let ters Patent of the United States, is as follows:

1. The combination with a steam-boiler having water-circulating pipes on the side of the shell and spaced apart therefrom, of a firepot having combined with the grate segmental arches of refractory material disposed parallel to the shell and with their upper ends abutting against said circulating-pipes, substantially as and for the purposes set forth.

2. The combination with a return-flue boiler having water-oi rculating pipes along the sides of the shell and spaced apart therefrom, of a setting for said boiler, constructed to afford a rear-end extension or breech-chamber, side arches of refractory material connecting the side walls of the setting with the boiler-shell, and a fire-pot having combined with the grate segmental arches of refractory material disposed parallel to the shell, and abutting the lower members of said circulating-pipes, the said side arches and fire-pot arches cooperating with each other and the walls of the setting to afford large fiues or flame-chambers, receiving from the fire-pot and communicating with the breech-chamber,substantially as and for the purposes set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN E. OAVANAGH.

Witnesses:

WALTER L. CASE, M. K. VVHITTEMORE.

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