US2181473A - Water-cooled stoker - Google Patents

Description

Nov. 28, 1939. J. 5. BENNETT WATER-COOLED STOKER Filed Nov. 4, 1937 2 She ets-Sheet l JMW J Nov.'28, 1939. J, s, BEQNETT 2.1s1,473

WATER-COOLEID STOKER Filed Nov. 4, 19 37 2 Sheets-Sheet 2 I T l u I Patented Nov. 28, 1939 UNITED STATES 2,181,473 wArER-oooLEn STOKER Joseph S. Bennett, Merion, Pa.,

ican Engineering Company,

assignor to Amer- Philadelphia, I a.,

a corporation of Pennsylvania. Application November 4, 1937, Serial No. 172,711

1 Olaim.

This invention relates to furnace stokers, and more particularly to furnace stokers of the fluid cooled type.

In stokers of this type certain of the fluid conducting tubes of the cooling system associated therewith are protected, at least in part, from the heat of the furnace. Circulation of the fluid through such tubes therefore often becomes sluggish, causing overheating of the tubes, and ultimately, damage thereto.

One object of the present invention is to provide an improved circulatory system for the fluid cooled section of furnace stokers of the stated character which will eliminate the abovementioned difficulties. I

Another object is to so arrange the riser connections for the fluid cooled section of stokers that they will be exposed directly to the heat of the furnace, thereby inducing rapid circulation in the system. v

A further object is to arrange the riser connections of the fluid cooled system of the stoker in such a manner that they will serve the dual function of inducing rapid circulation in the system, and of cooling a portion of the walls of the furnace.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawings:

Fig. 1 is a longitudinal sectional view taken through a stoker furnace showing a construction wherein the tubes forming the cooling medium for the tuyres, and the riser connections for the cooling section of the retorts, extend upwardly and form a portion of the front wall of the furnace.

Fig. 2 is an enlarged detail sectional View of the upper header shown in Fig. 1, and

Fig. 3 is an elevational view with a portion of the header broken away, taken substantially along line 33 of Fig. 2.

The drawings illustrate a construction wherein the boiler 56 of'the furnace 51 is fired by a stoker 58 of the dump type. Boiler 56 comprises steam drums 59 and connected by tubes 6|, and a mud drum 62 which is connected to the steam drums by the usual banks of tubes 63. The inner bank of tubes 64 may be block covered at the lower end thereof, as shown at 65, and constitutes the bridge wall of the furnace. Stoker 5B is of the inclined grate underfeed type consisting of alternately disposed retorts 66 and tuyere rows 61. Each retort 66 has provided at the bottom thereof a series of feeding pushers 68, the lowermost of which rests upon a fuel supporting or dead plate 69. Mounted on a shaft 10, extending transversely at the lower, rearwardly disposed end of the stoker, are a series of dump plates ll. These plates are arranged in spaced relation with the lower ends of the boiler tubes 64 forming a pas- 5 sage l2 therebetween through which the refuse fed from the stoker may pass. Adjustable means for shaft '10 may be provided to vary the size of the discharge passage 12 if so desired.

Each tuyre row 61 of this construction has. 10 also provided in cooling relation therewith one or. more tubes 13. These tubes are bent upwardly, as shown at 14, so as to extend along the inner surface of the front wall 15 of the furnace, and terminate in a header [6. The lower ends of tubes 15 13 extend beyond the tuyere rows 61 and are bent downwardly, as shown at 11, and terminate in a header |8 disposed beneath dump plates II. The dead plates 69 have also mounted in cooling relation therewith one or more tubes 19. The for- 2 wardly disposed ends oftubes 19 are connected to a header 80 mounted in any suitable manner beneath the stoker, while the rearwardly disposed ends thereof are bent downwardly in parallel relation with the extended portions of tubes 13 and 25 also terminate at their lower ends in header 18. Header 86 is. connected to header I6 by risers 8|. These risers extend upwardly along wall 15 and may be disposed between the portions of the tubes 13 extending upwardly from the tuyre rows. 30 Header I8 is connected to the mud drum 62 of the boiler bydowntake connections 82, while header 16 is connected to steam drum 66 by tubes 83, the latter of which extending along the inner surface of the upper wall 84 of the furnace.

As shown more particularly in Figs. 2 and 3, the upper ends of risers 8| are connected to the corresponding tubes 83 by elbow connections 85. The enlarged end 86 of each elbow 85 telescopes over the upper end of its corresponding riser 8| and may be secured in position by any suitable means, such as by welding. The reduced end 81 of each elbow on the other hand simply abuts the inner end of a corresponding tube 83. By this construction proper circulation between the fluid 45 cooled. section of the stoker and the boiler is assured. I

It will be observed that the risers 8|, the upper portions of the tubes 13, as well as the tubes 83, are directly exposed to the heat of the furnace, 50 and consequently relatively rapid circulation will be induced in the system.

While the embodiment herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that the 55 invention is not to be limited thereto, since it may be embodied in other forms, all coming within the scope of the claim which follows.

What is claimed is:

In a furnace, the combination of a boiler, a StOkBI for firing said boiler, said stoker comprising alternately disposed retorts and tuyere rows, fuel supporting means provided at the bottom of each of said retorts and extending between adjacent tuyere rows, front, side and top walls for said furnace, a pair of fluid conducting tubes mounted in cooling relation with each of said tuyere rows, extensions for said tubes extending vertically along said front wall, a header mounted interiorly of said furnace connected to the upper ends of said extensions, a series of tubes extending along said top wall connecting said header to said boiler, one or more fluid conducting tubes mounted in cooling relation with each of said fuel supporting means, a second header connected to the lower ends of all of said tubes, means connecting said second header to said boiler, a third header connected to the upper ends of the tubes mounted in cooling relation with each of said fuel supporting means, risers connecting said third and first headers, said risers extending vertically along said front wall between pairs of said first mentioned tubes, and a plurality of connecting means mounted within said vfirst mentioned header and establishing communication between

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