US746957A - Furnace for steam-boilers. - Google Patents

Description

Patented December 15, 1903.

. UNITED STATES PATENT OFFICE.

PHILIP J. GRAU, on TYRONE, PENNSYLVANIA.

FURNACE FOR STEAM-BOILERS.

SPIEGIFIGATION forming part of Letters Patent No. 746,957, dated December 15, 1903.

l v Application filed October 15, 1992;. Serial No. 127.819. (No model.)

To all whom it may concern: w 2

Be it known that I, PHILIP. J. GRAU, off Tyrone, county of Blair, Stateof Pennsylvania, have inventedan Improvement in Fur-i naces for Steam-Boilers, of which the follow-;

' triangular in. cross-section, so as to presenting is a specification.

My invention hasreference to furnaces for steam-boilers; and it consists of certainim-j provements which are fully set forth in the{ following specification and shown in the ac-f companying drawings, which form a part 5 rear portion of each of the columns may be thereof.

v The object of my invention is to provide a. construction of boiler-setting which shall supply the furnace with superheated air at thei bridge to consume the carbon-d net and smoke or unburned gases passing fromthe furnace; under the boiler and at the same time cause 5 the air in the act of being heated to cool the g side walls or lining of the furnace proper, as l way d of the bridge-cap D. The inclined pointed out hereinafter.

My invention consists in providing the side I walls of the furnace with fines through which air is forced to cool the said side walls and also cause the air to be superheated, thesaid furnace being further provided with a bridge formedof fines through which the air from p the side walls is allowed to escape forthe purpose of burning the gases, carbon'parti- .1 any number) form between them throats L,

cles, and smoke passing from the furnace.

My invention also comprehends details of construction which, together with the above features, will be better understood by refe-rdotted lines in Fig. 2.

once to the drawings, in which- Figure 1 is a sectional elevation through a I furnace, showing my improvements applied to steam-boilers, the said section being taken i on the line 2 z of Fig. 2. Fig. 2 is a sectional plan view of same on line so a: of Fig. 1. Fig. 3 is a vertical sectional plan view of same on line y y of Fig. 1. tion through the upper part of the bridgewall and column, taken on the line 10 w of Fig. 5; and Fig. 5 is a transverse section of r the said column on line 8 s of Fig. 4.

A represents a steam-boiler and may be of i bridge-wall at the rear of the grate-bars. The" upper portion or cap of the bridge-wall I form of fire-brick, preferably molded into a tubu- Fig. 4 is a vertical sec- I larbox D, with an inclined front wall having a longitudinal air-passage d and a series of apertures at the top for receiving the air-col .umns.

E shows a series of air-coin mns, preferably toward. the grate-bars two inclined walls 2. The'lower part of these columns is provided with shanks T, adapted to fit into the upper part of the box-shaped fire-brick cap D of the bridge, as is clearly shown in Fig. 4. The

R, opening at the bottom into the passagefaces 6 of the columns are provided with a series of apertures 4, opening from the passage-way R. The height of the columns is preferably such as to fit approximately to the underside of. the boiler, as is shown clearly in Fig. 3, but would of course be shaped differently with difierent boilers. The series of vertical columns E (of which there may be gradually lessening in width as they approach from the front to the rear. The columns E may be staggered, if desired, as indicated in The side Walls K of the furnace are lined with inverted- L-shaped fire --brick, which when assembled formaseries of inclosed passage-ways k of sinuous form opening at the front of the boiler-setting into the air-supply pipes H. and at the cap D. l The supplypipes H are provided with valves 7:. of suitable construction and connect with a main flue H extending under the door to the blower J. A valve 1' may be employed in this main flue H to control the flow of air through it.

Air may be admitted to the bridge-cap D through a hollow floor F, which may be provided with a series of hal de-plates or walls f, forming a sinons passage-way G, communicating at one end of the cap D and at the free end in a pipe H, provided with a suitable valve I and, if desired, communicating with a blower or fan J of any suitable construction. The blower J may be omitted, if desired. In this manner the air, passing through the floor F becomes superheated and emerges from the apertures r of the columns E in a highly-superheated condition, it being first heated in the floor F and then superheated to a greater extent in passing through the bridge-wall and columns. When the air escapes from the columns, it is directed toward the passing products of combustion and is carried backward with said products of combustion and forced into intimate contact therewith while the said products are pass ing over the highly-heated surface of the columns, thus insuring the most thorough commingling and superheating of theentire gases. As these combined gases pass through the throats L they are condensed into the most thorough contact or admixture and lead from the rear in strong heating-flames. It will now be seen that the air may be directed wholly through the hollow-floor superheater F on its'way to the bridge-cap flue d or wholly through the main H and the side fines is of the furnace-walls K or wholly through each of the superheating devices, as desired. The air in either case is thoroughly heated before emerging from the upright columns E, and in case of the side flues it it may be regulated to insure a proper quantity of air passing through each of the walls K. While these furnace side walls act as perfect superl heaters for the air, the air, on the otherhand,

keepsthem from overheating and burning.

out. This construction overcomes the destruction difficulty'which so frequently occurs in furnaces of ordinary construction by insuring exceptionally long life to the lining; Aside from the saving in expense in labor and material there is also the great saving in loss of use of the boiler, which loss heretofore occurred whenever the side walls were required to be rebuilt. The side walls may be of any length found convenient and formed in any way desired so long as they cool the lining and act as flues for conveyance of air.

Where it is not desired to superheat the air before passing through the columns, it may be directly passed into the box-cap D by an air-fiue H provided with a suitable valve L which may be controlled by a chain 71, as clearly shown in Figs. 2 and 3. In some cases it is not desired toadmit air from the columns E at all, as the superheating effect of the said columns of refractory material insures all the requirements where a slower and more uniform temperature is necessary.

by Letters Patent, is

1. In a furnace for steam-boilers, the combination of the grate with side walls provided with sinuous air-passages formed by L-shaped fire-brick, a hollow bridge-wall having openings in its upper surface, and receiving heated air from the passages in the side walls, means for forcing air through the passages of the side walls, hollow columns of refractory material fitted into said openings and having inclined faces at, the front or forward end provided with air-orifices opening through them into the interior and which columns are so arranged as to form a series of parallel vertical passages through which the products of combustion from the grate are required to pass.

2. In a furnace for steam-boilers, the combination of the grate, side walls on each side of the grate provided with air-passages, arranged in sinuous form adapted to receive the air at the top and deliver it from the bottom in heated condition, a hollow bridge-wall having openings into the lower parts of the air-passages and also into the furnace-space above the grate, a blower, pipes leading from the blower to the upper part of the air-passages, and separate valves for controlling the supply of air to each of the air-passages.

3. In a furnace for steam-boilers, the combination of the grate, two independent and parallel side walls on each side of the grate provided with air-passages formed in sinuous form therein by the fire-brick lining, means for independently circulating air through the air-passages of the two side walls from the top downward, and altransverse passage-way across the rear of the fire-box in which the lower part of each of the passage-ways open and provided with apertures through which the combined heated currents of air pass into the furnace.

4. In a furnacevfor steam-boilers, the com- PHILIP J. GRAU.

Witnesses:

SAMUEL GRAHAM, R. S. YINGER.

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