US662926A - Furnace. - Google Patents

Description

Patented Dec. 4, |900. F. J. FOVEAUX.

FURNACE,

(Application filed May 5, 1899. Renewed July 16, 1900.1

3 Sheets--Sheet l.

(No Model.)

" No. 662,925. Patented nec. 4, |900.

` F. J.rovEAux.

FURNACE.

(Application led May 5, 1899, Renewed Jx'xly 16, 1900.)

3 Sheets-Sheet 2.

(No Model.)

, WW1/www No. 662,926. Patented Dec. 4. i900. F. J. FOVEAUX.

FUHNACE.

(Applicatof led May 5, 1899. Renewed July 16, 1960i) (No Mudal.) 3 Sheeis--Slheet 3.

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iNITED STATES OOFFIC.

ATENT FURNACE.

SPECIFICATION forming part of Letters Patent N o. 662,926, dated December 4, 1900. Application ned Miy5,1999. Renewediuiy 16,1900. sans No. 23.824. (No modem furnaces; and it consists in the novel arrangement and construction of the parts, as hereinafter set forth.

In the drawings, Figure l is a side elevation of a boiler and furnace having this invention applied thereto. Fig. 2 is a plan View of the fire-box of the furnace, showing the arrangement of the air-distributing pipes. Fig. 3 is an end elevation, diagrammatic in form, to show the lines of intersection of the air as ejected from the air-pipes. Fig. 4. is an enlarged detail view, in side elevation, showing the forward end of the air-distributers. Fig. 5 is a sectional View of the same, taken on the lines X X, the view being directed,`as shown, by the arrow in Fig. 4. Fig. 6 is an enlarged detail View of the rear end of the airdistributing pipes. Fig. 7 is an end elevation of the view shown in Fig. 6.

One object which the present invention has in view is to provide a construction whereby air may be introduced into the fire-box of a furnace above the bed of the fire to spread the injected air across the entire surface of the fire-box and across the line of draft of the furnace to disperse the gas volumes and to admix therewith the oxygen contained in the injected air to produce a more complete and added combustion.

A further object is to produce a construction that may be applied to the existing furnaces without necessitating a change in construction of the present fire-box or necessitate the diminution of its surface.

With these objects in view the invention consists in extending across the surface of the lire-box and across the line of draft of the furnace pipes to be used in conjunction with an air-blast, the pipes being perforated on the under side to eject streams of air radially from and below the center of the pipes, the said pipes being distributed across the surface of the lire-box and supported by the walls thereof.

It further consists in the construction and arrangement of the pipes connected with the boiler and clustered about the said air-pipes and inclined to permit the water contained Within them to circulate for the purpose of protecting the air-pipes from the heat of the furnace while utilizing the heat for steam pro duction.

To facilitate the description of the invention with reference to the drawings, I will use the letter A to designate the lire-box of a fur nace of any desired construction. The letter B will be used to indicate the heatingtubes of the ordinary boiler construction, and the letter O the boiler. All of these parts may be any of the Known and desired constructions in which the fire-box is provided with feeding-doors, grate-bars, and passage below the same for the introduction of an airdraft.

The fire-box is provided with a front wall A and rear wall A2. In the style of construction shown in the drawings the rear wall A2 is utilized for the additional purpose of supporting the group of heating-tubes. These heating-tubes are provided at either end with what are styled lakes BB, from which the water contained in the tubes is received from the one at the lower or depressed end of the tubes and delivered into the one at the upper end, from whence it passes into the boiler C.

Between the front wall A and the rear wall A2 are suspended the air-distributing pipes constructed in accordance with this invention. The distributing or air pipes D are long enough to extend across the space between the front wall A and rear Wall A2 of the lirebox to be supported thereon. The inner or rear end is provided with a solid cap D2, while the forward end is extended through a hollow collar and is suitably connected with the main supply-pipe E. The pipe D is provided with a number of perforations D' on its undersurface. These perforations are so placed in the pipe that radial lilges drawn through the center of the pipe and he center of the extreme perforations would .extend at an angle to the perpendicular and the grate-bars.

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These extreme lines of the perforations, together with the intermediate perforations, produce when the invention is being operated aspray of atmospheric air striking down upon and spreading over the surface of the fire-bed. The main pipe E is connected with any suitable air-propelling device'. The number of the air-pipes D used in a furnace is dependent upon the width of the fire-box and the height at which the pipes D are placed above the hre-bed. It is designed that the radial lines drawn-through the center' of eachpipe and the extreme perforations D should in the adjacent pipes intersect above the fire-bed. Whether there are one or many of these perforated air-pipes used, however, does not necessitate the altering of the construction of the fire-box of the furnace further than to form the pockets or receptacles in the walls A/ A2 for the ends of the pipe to rest therein.

When the pipes D are connected to the main pipe E, the operation of the invention isas follows: When the lire is started and under way, the draft through the stack or other forms of draft being established, the

air is admitted into the main pipe E, which,

` as shown in the drawings, extends across the' front of the furnace and by it` is con'- du'cted into the distributing-pipes D under greater or less pressure, which has the effect of forcing it through the perforations Dlv with greater or less force to produce smallA streams o'f air striking downward and slightly diffused over the bedof the ire. Under ordinary circumstances, and particularly when burning bituminous coal, there is liberated an amount of heavy monoXid gas, which passes away so rapidly as to avoid being consumedin which avoidance it is aided by its tendency to hold together and also by the fact of its non-combustibility until properly admixed with'oxygen. The effect of driving this air by the diffused streams spoken of onto the fire-bed is that besides injecting an amount of oxygencontaining atmosphere into this gas, and thereby rendering it readily combustible, the gas forms are broken up and dispersed, so that when in full operation the total gases of the kind specified are thrown back within the influence of the com` bustion and there consumed. v

It is to prevent the overheating of the airpipes D that I have provided the cluster of water-circulating pipes F. These are arranged about the under side of theV pipe D, spaces being left between the pipes E for the passage of the air from the perforations. The pipes F rest near or against thepipe D. They extend between two hollow chambers F and`F2. The chamber F, besides receiving the pipes F, also receives and supports the'upper and forward end of the pipe D, as' shown particularly in Fig; LLof the drawings. This chamber F' is connected by a suitable pipe to the upper lake of the boiler-heat'- in'g tubes. n The hollovwc'hamber F2 is semicircular in form,as shown in Figs. 6 and '7, and is connected,by means of suitablepipes F4,to the cylinder or drum F5, which is connected to the lower of the two lakes forming part of the heating-tubes for the boiler. By means of these connections with the upperand lower lakes of the boiler-heating tubes the pipes F are maintained lilled with water. They are Ainclined to the same angle as are the heatingtubes B in order that an even circulation of water may be maintained in the pipes F when the-Water contained therein is heated. In this manner the heat, which might otherwise destroy the distributing-pipes D, is carried away and its surface is maintained relatively icool. The pipes F are suitably mounted in lthe hollow chambersV F' F2 in the form of iclusters, and the construction is independlen'tly completed by the tie-rods F6, which eX- ltend through certain of the pipes F and through the hollow'chambers, to be secured and tightened as desired. The chambers F are provided with screw-plugs F7 of the iusual construction, in line with the pipes F, lwhereby the said pipes are cleaned.

While I have here described the construction as embodying an air-blast and the main iSupply-pipe used in'conjunction therewith, I do not wish to limit myself to such construcv3tion, for very excellent eifects may be' ob- Etained by merely opening the outer ends of the pipesD and permitting the air to' flow through them into the'fire-box. Thisis parlti'cularly true where a forced air-'draft is used iin firing, which causes aV partial vacuum in 5the fire-space, to fill which the air rushes through the pipes D land the perforations therein. This construction, together with `regulating-dampers, I wish to be understood fas' claiming. f

p It willnow be observed that with a construction such as described the' apparatus maybe appliedfto any of theWell-known constructions of furnaces of any width without necessitating the'alterationof the construe# tion of the fire-box as has heretofore existed. All that is required in applying the present invention is merely'to use'a large enough number of air-pipes D, so that they will not become separated too far..

Having thus described this invention, it is claimed- 1. In a furnace, a front and rear hollow chamber, s aidfrontchamber having an opening therethrough, an airpipe extending through said opening and above the grateba'rs and having its under surface provided with perforations, a clusterof water-tubes abo'ut'the under side of said pipe and opening into said chambers, said tubes being separated on lines corresponding withl the lines of the perforation's in theV air-pipe to permit the `egress of the air, and connecting waterchannelsbetween the said chambers'and the water-space of the boiler; substantially as described. l

2. In afurna'ce,v a series offwaterstubes,

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1o sponding with the lines of the perforations in the air-pipe to permit the egress of thel air, and connecting Water-channels between the said chambers and the said corresponding lakes; substantially as described.

In testimony whereof I have hereunto set 15 my hand this 24th day of April, 1899.

FRANK J. FOVEAUX. Witnesses:

E. F. MURDooK, BALDWIN VALE.

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