US669771A - Water-tube boiler. - Google Patents

Description

No. 669,.77I. Patented Mar. 12, I90I.

" E. R. STETTINIUS;

WATER TUBE BOILER. (A P1168 fil d F 'b 28 1 0 v (Flo Model.) 2 Sheets-Shaet l.

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E. n. STETTINIUS. WATER TUBE. BOILER. (Application fllad Feb. 28, IQOOJ A} Eyi,

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NTTED STATES PATENT OFFI E.

EDWARD R. S'IETTINIUS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STIRLING COMPANY, OF SAME PLACE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent N 0. 669,771. dated March 12, 1901. Application filed February 28, 1900. Serial No. 6,841. (No model.)

T0 at 21/77/071 it may concern;

Be it known that I, EDWARD R. STETTINIUS,

a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have in vented a new and useful Improvementin Water-Tube Boilers, of which the following is a specification.

The object of my invention is to improve the vertical water-tn be boiler of the type commonly known as the Stirling boiler; and the invention consists in the features and combinations hereinafter described and claimed.

In the accompanying drawings, Figure l is a cross-sectional elevation of my improved boiler,the circulating-pipe being shown in dotted lines; Fig. 2, a longitudinal sectional elevation of part of the boiler, showing one of the circulating-pipes embedded in the wall or setting; Fig. 3, a longitudinal sectional elevation showing the circulating-pipes inside the wall or setting; and Fig. 4:, a longitudinal sectional elevation showing the circulating-pipes outside the wall or setting.

A, A, and A are elevated steam and water drums, a, pipes communicating between the steam-spaces thereof, and a pipes communicating between the water-spaces thereof; B, lower mud-drums; 0, banks of tubes connecting the elevated steam and water drums with the lower mud-drums; D, circulating-pipes connecting the ends of the rear elevated steam and water drum with the ends of the front lower mud-drum; E, the fireplace, and e a fire-brick arch over the same, and F firebrick partitions in rear of and adjacent to the front and middle banks of tubes, respectively.

The Stirling type of boiler, to which my in vention relates, is so well known that I do not consider it necessary to describe its construction or operation in detail. In this view, and because they are clearly shown in the drawings, no description is considered necessary of the elevated steam and water drums and connecting-pipes, lower muddrums, banks of tubes connecting the lower mud-drums with the elevated steam and water drums, fire-brick arches and partitions, and other features in common use as parts thereof. In addition to these parts or features,

however, I provide special circulating-pipes between the rear elevated steam and water drum and the front lower mud-drum, which circulating-pipes communicate with these drums at or near their ends, respectively, and are embedded in the wall or setting of the boiler or placed inside or outside thereof, as desired. In Fig. 2, which illustrates only a part of the boiler, one of these circulating pipes is shown as embedded in the wall or setting. In Fig. 3 the two circulating-pipes are shown inside the wall or setting and in Fig. 4 outside the wall or setting. As already stated, these pipes communicate with the end portions of the drums to which they are attached, respectively; but their connections are not necessarily at the extreme ends of the drums, connection near the ends being suificient. As shown, feed-water is to be introduced into the rear mud-drum; but it may be introduced into the rear elevated steam and water drum or elsewhere as desired.

In filling, the feed-water being introduced into the rear mud-drum passes up through the rear and middle banks of tubes into the rear and middle elevated steam and water drums, and from the rear elevated steam and water drum it passes down through the circulatingpipes to the front mud-drum and thence up through the front bank of tubes to the front elevated steam and waterdrum also, from the middle elevated drum through the connectingpipes to the front steam and water drum. In operation the front bank of tubes beingin the hottest part of the boiler the most rapid up- Ward circulation will be through this bank; but the circulating-pipes permit a constant downflowand supply of water to take the place of water converted into steam in this bank of tubes and also the place of water passing from the front steam and water drum into the middle steam and water drum or elsewhere. The water-spaces of the elevated steam and Water drums communicating with each other, water passes from one drum to the other as required bycirculation and other conditions. In other words, the circulating and connecting pipes provide for a powerful circulation of water up through the front bank of tubes and across from the front steam and water drum to the middle and rear steam and water drums and down to the front mud-drum,

and so on in circuit, the practical effect being that the tubes of the front bank are more completely filled with cooler Water or water free from steam and the transmission of heat in this bank thereby greatly increased. 00- incident with this primary circulation there is also a secondary circulation of the feed-water up through the middle bank of tubes to the middle steam and water drum, thence across to the rear steam and water drum and v down through the rear. bank of tubes, and so on in circuit, this circulation serving to heat the feed-water and thereby provide for separation and a settlement of scale-forming matter in the rear and cooler parts of the boiler. If feed-water be introduced in the rear or middle steam and water drum or elsewhere in the rear part of the boiler, the circulation will be practically unchanged.

The circulating-pipes being of larger diameter than the diameter of the tubes of the several banks and being located in a comparatively cool part of the boiler provide for a constant and abundant supply of water from the rear part of the boiler to the front part and this Without having serious counter currents in the tubes furnishing the heating-surface and primarily intended tor the generation of steam.

Although I have shown and described one circulating-pipe at each end of the boiler, it will be understood that one or more may be used, as desired. It will also be understood that instead of two circulating-pipes, one at each end, a single circulating-pipe may be used at one end only.

I claim 1. In a water-tube boiler, the combination of a front elevated steam and water drum, a middle elevated steam and water drum, a

rear elevated steam and water drum, pipes communicating between the steam and the Water spaces of said drums respectively, a front lower mud-drum,a rear lower mud-dru m, banks of tubes connecting the rear mud-drum with the middle and rear steam and water drums respectively, a bank of tubes connecting the front mud-drum with the front steam and water drum, a circulating pipe or pipes at or near the ends and communicating between the rear steam and water drum and the front mud-drum, located in cool relation to the boiler-setting and giving an auxiliary circulation at the end between the two drums, means for introducing feed-water, and means for drawing off steam, substantially as described.

2. In a water-tube boiler, the combination of a front elevated steam and water drum, a middle elevated steam and water drum, a rear elevated steam and water drum, pipes communicating between the steam and the water spaces of said drums respectively, a front lower m ud-d ru m,a rear lower mud-drum, banks of tubes con necting the rear m ud-d ru in with the middle and rear steam and water drums respectively, abank of tubes connecting the front mud-drum with the front steam and water drum, a circulating-pipe at each end of and communicating between the rear steam and water drum and the front muddrum and giving an auxiliary circulation between the two drums, each pipe embedded in the boiler Wall or setting, means for introducing feed-water, and means for drawing of]? steam, substantially as described.

EDWARD R. STETTINIUS.

Witnesses:

FRANK O. WAGNER, THOMAS B. MCGREGOR.

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