USRE11793E - Furnace - Google Patents

Description

Reissued Dec. I2', |899.

M. C. HAWLEY.

FURNAGE.

(Application Bled. Npv. 1, 1899.).

5 Sheets-Sheet 2.

Reissued Dec. 12,1899.

HAwLEY.

FunNAcE. (Application led Nov. l, 1889() 5 Sheets-Sinaai 4.

Nu. H593. Ressued Dec. I2, |899. M. C. HAWLEY.

FUBNACE.

(Appucmon med mv. 1, 1899.)

5 Sheets-Sheet 5.

45 same parts.

UNITED lSTATES PATENT OEEICE. s

MELVILLE C. HAWLY, OF ST. LOUIS, MISSOURI, ASSIGNOR TO lTHE HANLEY DOWN DRAFT FURNACE COMPANY, A CORPORATIONV OF lLLlNOiS, OF

CHICAGO, ILLNOJS,

r-'ularuxczaV SPECIFICATION forming part of Reissued Letters Patent No. 11,793, dated-December 12, 1899- Original No. 4;?,179 dated February 24,1891. Application for reissue filed November 1I 1899,- Serial No'. 736,490.

To LZZ whom it 12mg/ concern:

Be it known that I, MELVILLE C. HAWLEY, of St. Louis, Missouri, havemade a new and useful Improvement iu Furnaces, of lwhich 5 the following is a full, clear, and exact dets the combination-f a lower upward-burning grate with an upper downward-burnin g grate, the bars of said upper grate being spaced an unusual distance apart or so constructed as to provide unusually wide spaces between the ao bars, whereby ample provision for a downward draft through the upper fire is. provided, as well as for the consumption Vof such partially-consumed fuel as maydrop from the upper grate, al1 substantially as is hereinafter z set forth and claimed, aided by the annexed drawings, making part'of""'ls specilication, and exhibitingadesirable means for carrying out the improvement, and in which- Figure lis a front elevation of an ordinary 3o stationary multitubular boiler arranged accordin' to this invention. Fie'. 2 is a lon b b g tudinal View of the same within the boiler,.

and the parts constituting my invention are shown in side elevation, while the lower firel grate, ash-pit, and flue are shown in section.

Fig. 3 is a ltransverse section on the line3 3 of Fig. 2; and Fig. Il is a plan, partly in horizontal section, corresponding to Figs. 1, 2, and

A l 3. Fig. `5 is a detail in section showing actual 4o size, as well as distance apart, of the several bars of the upper grate. Fig. 6 is a detailin plan to show the distance apart in an actual grate of thelower grate-bars. v

The same letters of reference denote the In Figs. l, 2, 3, and 4' the upper fire-grates consist of an upper and a `lower row of inclined tubes, (marked A and B, respectively.)

These tubes are sufficiently thick to resist the 5o weer and destruction thereof which occurs through the action of firing, and the lower tubes B are respectively opposite the spaces between the uppertube A. Thus the two rows of tubes A* and' B constitute an upper fire-grate having `a series of zigzag spaces, which, while being suiiciently contracted for effectively supporting the fuel d urin g-the rst 1 Stages of its combustion, are yet suliiciently wide to provide for avdownward draft and to allow the'fuel after the earlier part of its com station is @neer-ed to fau down 'through the bars of the upper grate and be caught upon l the second fire-grate C bel'wi This last= named grate C is constructed of ordinary bars arranged in the ordinary manner, and it is preferably a dumping-grate.

The tubes A in practice are arranged'rabout two' and three-quarter inches apart horizontally, and the distance betweenthe bars A and' B is about one and one-half inches.

The tubes Aand'B are supported in position by having their front ends fixed into the water-bridge D and their inner ends vsimilarly fixed into the water-bridge E. The front or outer water-bridge D is united to the boiler F by means of the pipes D D2 D3, through which water may be conducted downward from a lower level in the boiler into the lower ends of the inclined Water-tubes, and the bach` or inner water-bridge E is connected therewith by the pipes E E2, through which water may be conducted upward from the higher ends of the water-tubes and delivered back to the boiler at a higher ievel therein,

By means of these connections a compiete circulation of water from the boiler through the water-bridges D E and through the tubes A and B is at all times maintained.

Fire-'doors G are provided for enabling the fuel to be fed'onto the upper grate, and a second set of iire-doorsH are also providedfo:` giving access to the fuel o n the lower grate C. The lower grate-bars Cgmay be arranged in two sets, as shown in the drawings, with a division of brickwork between them formed with an inclined top, asshown at J, Fig. 3, while at the outer sides of ,these tire-bars similar brickwork with au inclined top is used. These inclined surfaces cause the fuel which falls from the upper grate to locate itself 45 wasoriginally taken.

sto pass thence sidewise y155 nplper grate. l`

upon the lower grate. The ash-pit K at the front end thereof is shown as closed over with aplate or plates L, in which a register of .the ordinary kind for regulating the passage "of`airlg1naylbe fitted, or the ash-pits at that point may be `left open or connected with a forced draft.

As the gases, smoke, flame, and the volatile products of combustion given ed by the fuel Io on the upper hre-grate connot, by reason of the space between the water-bridge E and the boiler F being stopped by the fire-brick c or any equivalent wall, escape upward, they pass by the action of the draft downward 3x5 through the spaces between the tubes A and ABand into the combustion-chamber M bctween the grates, where they meet and bec'ome mixed with the 'like products escaping upward from the lower grate C, and the prod- .zo ucts of combustion from both the upper and lower grates 'are further consumed in the chamber M and thence escape together under the back water-bridge E into the Hue N and thence through the remaining dues of the 25 boiler.

In carrying ont this invention I desire not to be limited to any particular construction at the inner end of the upper grate, whereby the downward draft from the upper fire-grate 3o int@ the chamber Mis completed. Any suitable form of wall, partition, water-leg, or combined water-bridge and wall may be used. Nor do I desire to be restricted to any special form of-grate-bar or mode of directing a water circulation through the grate-bars and boiler, except that the upper grate shall be formed of inclined water-tubes, one or more rows, as desired, and shall have such connections as will permit water to be conducted 4o down from near thc bottom of the boiler into their lower ends and after passing through A the tubes conducted upward from their higher vends and delivered back to the boiler at a point higher than the point from which it I prefer, however, the Various forms exhibited in the drawings, and so far as forming an upper/grate so that a downward draft may be successfully? obtained andthe fuel enabled to drop and the 5o npper grate thereb5T kept from choking is i concerned the zigzag system of bars A B shown is much the best, as by means thereof such lumps of the f uel as find their way downward onto 'the lower bars B have ample room and downward into chamber M. *The herein-described improved grate con- St'ruotion is adaptable to almost an y ordinary boiler. The upper grate, including the wa- 6q.tercha1nbers D and E, can be applied as an attachment to existing boilers substantially in the same manner and as readily as to new f boilers, and in either case the lower grate can be arranged, as described, to coact with the draft furnace,

l. In a combinedv downward and upward draft furnace, the combination of a lower upward-burning grate, an upper downwardburning grate consisting of inclined watertubes spaced widely apart,an intermediate combustion-chamber and an escape-[lue leading from the combustion-chamber, means for conducting water down from near the bottom of the boiler into the lower ends of the Watertubes, and means for conducting waterupward from the higher ends of the water-tubes and deiivering the same back to the boilerat a higher level therein, the barsof the lower grate being spaced closer together than the tubes of the upper grate, substantially as described.

2. In a combined downward and upward draft furnace, "the combination of the lower upward burning grate, an upper downwardburning-grate, an intermediate combustionchamber, and an escape-'flueleading from the combustionbhamber, the upper grate being formed of inclined water-tubes spaced widely apart as described, and at each end thereof connecting with a water-chamber in turn con-l nected with the boiler, the connection with the lower end of the tubes being at or near the bottom of the boiler and the connection with the higherend thereof being at a higher level in the boiler, and the bars in' the lower grate being spaced closer together than the tubes of the u scribed.

3. In a combined downward and upward draft furnace, the combination of the lower upward-burning grate, an upper downwardburning-grate, an intermediate combustionchamber and an escape-iiueileading from the combustion-chamber, the upper grate being formed of inclined water-tubes spaced widely apart and forming a series of zigzag spaces, as described, and at each end thereof connecting with a water-chamber in turn connected with the boiler, the connection with the lower ends of the tubes being ator near the bottom of the boiler and the connection with the higher ends thereof being ata higher levelin the boiler, and the bars :in the lower grate being spaced closer together than the tubes of the upper grate, substantially as described.

4. In a combined downward and upward the combination of the lower upward-burning grato, an upper downwardburning grate, an intermediate combustionchamber, andan escape-flue leading from said combustion-chamber, the bars in said upper grate being spaced widely apart and forming a Iseries of zigzag spaces, as described, and at each end thereof connecting with a waterchamber in turn connected with the boiler, and the barsin said lower grate being spaced closer together than are the bars of said. upper'grate, substantially as described.

5. In-a combined downward and upward draft furnace, the combination of the lwer upward-burning grate, an upper downwardburning grate, an intermediate eombustioncloset-together than are thebars of said upchamber,and an escapevfiue leadngfrom saidper grate, and the ash-pitvextending 'beiowro combustion-chamber, the bars in said upper the Hoor of the boiler-room and beyond he grate being spaced widely apart and forming ffurnace'front, substantially as described.

a, series of zigzag spaces, as described, and at 1 MELVILLE C. HAWLEY.. each end thereof connecting with a Waterl NVitnesses: l chamber in.turnconnected with the boiler, EPHRAIM BANNING,

and the bars in said lower grate being spaced THOMAS A. BANNING.

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