US761829A - Water-tube boiler. - Google Patents

Description

No. 761,829. PATBNTED JUNE 7, 1904. E. T.A HANNAM. l

WATER lTUBE BO'ILBR.

APPLICATION YILED HOV.`27`. 1903.

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No. 761,829. PATENTED JUNE f7, 1904. Y E. T. HANNAM.

WATER TUBE BOILER.

APPLIOATION FILED Nov. 27. 190s. No MODEL, 2 SHEETS-SHEET z.

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I l l 50099609099900616900 @GEOG .OGOOOOGOOOOO .OGOOOOOOOGOO .IGOOOGOOOGOGO @@OOOOGOQOOOQOOOOGO :OOOOOGOOO-OO-O @www-mow@ vl?l W'nesoe@ Inman/or NAM, a citizen of the United States, residing to provide a steam drum or drums above and of Ohio, have invented certain new and useful 'together than would be required were the delivery from the water -legs freevand4 open i UNITED STATES Patented June 7, 1904.

PATENT OEEICE.

WATER-TUBE BOILER.

SPECIFICATION forming part of LettersV Patent N0. 761,829, dated June 7, 1904.

Application iiled November 27, 190,3.

'o, @ZL wle/om t may concern,.-

Be it known that I, EDWARD THOMAS HAN- at Cincinnati, county of Hamilton, and State Improvements in Water Tube Boilers, of which the following is a full, clear, and exact description, reference being had to the`accompanying drawings, forming part of this speciiication.

It is usual in water-tube-boiler construction parallel to the series of Water-tu bes and to rivet the water-legs at front and reartothesteam-drum. This riveting necessarily has to be done by hand or by hand-machine, amatter of considerable expense in construction, and in addition material is wasted in cutting the water-leg plates to fit, and the plates have to be heated and shaped in various ways to conform to the surface of the drum. In older constructions the water-leg throats are necessarily constricted, which tends to impede the circulation, which necessitates as much depth as possible of each water-leg, and consequently longer stay-bolts to hold the water-leg plates throughout. In addition to this in Yexpanding the water-tubes into the Water-legs a longer mandrel has to be employed, and the expense and difficulty of operation is necessarily increased where-there is considerable space between the front and the rear plate of the waterleg. In such older constructions the boiler cannot be shipped'in sections, and great expense is frequently incurred in installing such boilers by reason of their cumbersome dimensions. I/Vhere ordinary steam-drums are employed in connection with the Watertubes and in order to furnish superheated steam, superheating appliances have to be added at considerable additional expense, as the steamdrums alone obviously cannot be used for superheating purposes.

My invention is directed toward overcoming these difficulties; and its object is to provide a safe, durable, and economical watertube boiler which may be shipped in sections when required, which can be riveted by ma- Serial No. 182,861. (No model.)

chine without hand-driven rivets, in which no Hanging or iitting of the water-legs to the steam-drum is required and no waste of material incurred, in which there are no seams exposed to the fire or hot gases, in which superheated steam isalways furnished without additional superheating appliances, and which in many other ways to be hereinafter referred to is very economical in construction, occupies less space with the same length of tube-surface, and which can be used for marine construction as well as on land.

In the drawings, Figure l is a sectional side elevation of my improved water-tube-boiler construction. Fig. 2 is a cross-sectional elevation of same. Fig. 3 is a vertical section of a modified construction of water-leg and drum. Fig. 4 isy a plan view of a portion of the water-leg drum, showing method of bracing the throat of the water-leg.

The boiler is provided with the usual heating appliances, in which A is the base, and B is the-front wall; C, the rear wall; D, the gratebars; E, the ash-pit; F, the bridge wall, and Gr the combustion-chamber.

H represents the series of water-tubes running lengthwise of the furnace arranged in the usual staggered series and provided with the front and rear water-legs L M, into which the Water-tubes are expanded lin the usual way. The outer plates of the water-legs are provided with the usual hand-holes for access to the water-tubes, the hand-holes being closed by hand-hole plates with gaskets and the usual crabs and bolts a a.

N P are water-leg steam-drums, which are a part ofthe water-leg construction andwhich run parallel to and opening into the leg portion throughout its entire width.

In the usual construction of water-tube boilers it is customary, as heretofore noted, to provide one or more steam drums parallel with the water-tubes and to which the front and rear water-legs are riveted, with necessarily narrow and constricted openings from the water-legs into the steam-drums. My construction is a complete departure from this older arrangement. My stearndrums are a part of the water-legs and can be called very properly water-leg drums. These steam- IOO drums and water-leg portions are preferably made ot' suitable wrought-steel plates-a vfront plate, and a rear plate. rIhe upper portions of these plates I) c are rolled in a cylindrical shape, the lower portions (l e being flat and in which flat portions are punched the holes for the water-tubes and the hand-hole openings, and the two plates making up the steamdrum and water-leg are then riveted together at the top at f and at the bottom at g. Instead of this construction the water-leg drum can be rolled in a single cylinder and the water-leg riveted thereto, as shown in Fig'. 3. In either ease, however, it is necessary to properlyT brace the construction at the opening between the water-leg and the drum. In order not to obstruct this passage-way, I provide the necessary number of brace-plates fm m of suiicient width and thickness and twist these brace or stay plates, so that the iiat ends Z Z may be riveted to the drum on each side and the twisted edge of the plates will extend across the opening. In this way without obstructing the opening I obtain ample strength and rigidity of construction. rIhc heads for the drums and waterlegs are then riveted in place, and the water-leg and drum construction is complete.

It will be noticed that the water-leg being a part of the drum construction there is no waste of material nor shaping and titting of the water-leg' to the steam-drum, and, moreover, that there is no seam in any way exposed to the hot gases. Inasmuch as the water-legs open throughout their entire length into the drums, these openings are in no way constricted, so that I am able to provide less depth Jfor the water-legs, and therefore shorter stay-bolts can be used, giving greater rigidity and durability at less expense.

The rear water-leg drum can be of considerably larger diameter than the .front drum, as it is into this drum that the feed-water is delivered. In this drum I arrange a mud-pan or puriiier, and it is evident th at a much larger purifier can be employed than in the ordinary constructions, as the mud -pan can extend nearly the entire length of the drum.I

To provide for the water circulation between the drums II I), I arrange in the length of the drums a series of equalizer-pipes S, the lower set below and the upper set above the usual water-line of the drums, and, as usual, to insure proper circulation, the water-tubes H ot' the boiler are inclined to the rear. Located intermediate the end drums, parallel thereto and somewhat higher, is a steam-d rum T with the steam-outlet U, and the drum is connected with each water-leg drum above the waterline by the tubes V, which can be otl a number of rows to get a greater superheat in the steam. Above the steam-tubes V the tile-roeic W ot' the boiler is constructed. Flue-partitions can be arranged to direct the course of the lire and hot gases in any desired way; but I prefer to provide two horizontal partitions Y Y, one at the bottoni and one at the top ol' the water-tubes H, so as to direct the course o t the lire from the combustion-chalnber at the rear to the liront water-leg at the top, so as to obtain the tull eliect ot the lire throughout the length of the water-tubes. The course of the lire and hot gases is then around the equalizer-tubes S and the steam-tubes V and out through the smoke-outlet Z. Itis evident that the equalizer-tubes will furnish a much more economical exposed surface to the lire than the usual steam drum or drums and that the steam-tubes V V will become superheatertubes, so that only superheated steam will be carried to the steam-drum T, which drum also has considerable heating-surface.

By means ot' the construction in which the water-drums are located across the ends ot the boiler-tubes at right angles thereto with the steam-drum above the plane ot the water-leg drums it is evident that my construction ol boiler can be used in marine propulsion, as the rolling and tossing of the vessel will not be suilicient to throw any water into the intermediate steam-drum, which can be placed, as will be readily understood, at any desired height. As will be seen, practically all ol the heating-surface of the boiler is a tubular su r- `face, so that circulation is positive, steam conversion very eifective, and all with great economy in construction. The boiler can either be shipped as a whole or in sections, as may be required. The front water-leg with its drum, the rear water-leg with its drum, the superheatcr steam-druln, the water-tubes, equalizer-tubes, and superheater-tubes may all be transported separately and the tubes expanded into the water-legs and drums at the place of installation. The brickworhY ol the boiler is also less than is ordinarily required, as the water-legs and drums malte up the entire front and rear walls at and above the boiler.

It will be of course understood without detailed description that the usual boiler accessories are provided, such as safety valve, steam-gage, water-level gage, blow-oil pipes, and feed-inlet pipe, damper, &c.

In connection with the damper I might add that with my construction the damper-traino and damper can be placed lower than in the longitudinal steam-drum constructions, for the reason that I can omit certain ot the tubes V running to the rear drum, and thus leave a space in which to swing the damper in the, smoke-inlet with the damper-frame considerably lower than in most older constructions.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isu

l. Ina water-tube boiler, a series ot watertubcs, water-leg therefor, and unter-leg drum, with passage between the leg and drum, and stay-plates secured across the passage-way,

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the stay-plates being bent to present their edges across the opening.

2. In a water-tube boiler, a series of watertubes, and water-legs therefor, with water-leg drums running parallel to the water-legs, and stay-plates riveted to the drum across the opening between drum and water-leg, the stayplates being bent to present their edges across the opening.

3. In a water-tube boiler, the combination with a series of water-tubes, of water-legs and water-leg drums therefor, equalizer-tubes between the water-leg drums, and an intermediate steam-drum-with steam-tubes connecting the intermediate drum with the water-leg drums.

4. In a water-tube boiler, the combination with a series of water-tubes, of water-legs and water-leg drums therefor, equalizer-tubes between the water-leg drums, an intermediate drum located above the plane of the water-leg drums, with tubesconnecting the intermediate drum with the water-leg drums above the water-line.

5. In a water-tube boiler, a water-leg with a water-leg drum formed in a piece with the water-leg plates, with seams at the top of the drum and bottom of the water-leg, whereby no seam will be exposed to the hot gases.

6. In a water-tube boiler, the combination with a series of water-tubes, water-legs at front and rear into which the water-tubes are eX- panded, drums at right angles to the watertubes, into which the water-legs open throughout their length, and to which the water-legs are riveted, equalizer-tubes connecting said drums, and an intermediate centrally-located drum, parallel to and in a plane above said water-leg drums, with tubes connecting the central drum with the water-leg drums.

' E. THOMAS HANNAM.

Witnesses:

W. S. KYLE, C. W. HOFFMAN.

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