US520684A - Edward s - Google Patents

Description

(No Model.)

E. S. T, KENNEDY. RADIAL TUBE STEAM BGILER.

Patented May 29, 1894.

1 I. Il Il @MMM/w? UNITE Tatras EDWARD S. T. KENNEDY, OF NEW YORK, N. Y.

RADIAL-TUBE STEAllvl-BOILER.`

SPECIFICATION forming' part 0f Letters Patent No. 520,684, dated. May 29, 1894.

Application filed August 27, 1889. Serial No. 322.108. (Nomotlel.)

To @ZZ whom it may concern.-

-Be it known that I, EDWARD S. T. KENNEDY, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Radial-Tube Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to radial tube or porcupine steam boilers of that type composed of a central water cylinder or stand pipe provided with radial water and steam tubes, and surrounded by a deflecting furnace and shell having deflecting plates at different heights above the fire-box, and more' particularly this invention comprises certain lmprovements in the construction of the central water cylinder or stand pipe of the boiler, covered by Patent No. 375,324-, granted to me under date of December 20, 1887.

As heretofore constructed, and in accordance with the description in the above patent, the central cylinder or stand pipe was constructed of short cylindrical sections, each of which had a vertical riveted seam, and the sections were joined at their ends by circular riveted seams. The short cylindrical sections composing the stand pipe were riveted together in such manner that the vertical riveted seams of adjacent sections extended in different'vertical lines at suitable distances apart, that is,-one fourth of the circumference of the cylinders, one from the other in successive order fromlef t to right, whereby the radial tubes could be arranged and spaced in the successive sections so as to divert and distribute the heated currents uniformly around the stand pipe in contact with all the radial tubes. By means of the above construction I was able to break up the vertical seam extending from top to bottom of the stand pipe, and thus avoid the formation of a direct flue, since in each section the tubes could be set in close regular order directly above the vertical seam of the section below and the iiame and hot products were thus more evenly distributed about the stand pipe and in contactwith the radial tubes, but still the short vertical flue spaces were left along the vertical seams for the reason that such seams interfered with the regular setting of radial tubes, materially decreasing the number of tubes which could be set in the stand pipe, and also necessarily leaving the short vertical iiues, through which the flames and hot products would pass in larger volume than through other portions of the combustion chamber, resultingin uneven heating and in uneven circulation of the water in the boiler.

` The object of my present invention-is to remedy the above difficulties and avoid all vertical seams and flues, whereby the radial tubes may be set in close regular order around the entire circumference of the stand pipe and from bottom to top thereof, and whereby a greater number of tubes may be set in a stand pipe of a given diameter. In order to accomplish this object I lap-weld together the vertical edges of the sections composing the stand pipe, thus doing away with the vertical riveted seams, avoiding the thickening of metal where the seams are usually placed, and providing for the regular setting of the radial tubes by doing away with the vertical seams and the resulting iiues necessarily formed where such seams were placed. The sections of stand pipe may be made longer andlessened in number; in fact, inthe smaller sized boilers, a single section might be used' composed of a sheet welded at its edges from bottom to top. In order to secure a more extended heating surface in this type of boiler, I provide the lower or fire box section of the stand pipe, which passes through the re bricks or deflecting furnace with corrugatlons as shown.

My invention is illustrated in the accompanying drawing, which illustrates an elevation of the boiler partly in section.

The furnace and shell A, of the boiler are built of brick and lined to a sufficient height with fire-brick suitably set upon a foundation W. The shell -is provided with numerous sight openings and doors u, and is surmounted by suitable hood and smoke stack. The usual fire chamber, ash-pit and grate are arranged at the lower part of the shell around the stand pipe, and deflectors c, c are arranged in the usual manner.

The stand pipe B, is composed of cylindrical sections 1,v 2, 3, and 4, or other convenient number, as shown. It is provided with a flanged and dished lower head I, riveted or welded to the cylindrical portion, and the walls of the cylinder extend down `and rest upon the circular foundation plate z', which is supported by the supplementary brick foundation n. As shown in the drawing the lower section Z, of the stand pipe is provided with circular corrugations above the grate for presenting a more extended heating surface, since such portion cannot be provided with radial tubes for the reason that such tubes would interfere with the proper firing of the boiler. The corrugations in this part of the boiler. take the place of the tubes so far as possible, and serve an advantageous and useful purpose in this type of boiler. The vertical seams of all the sections are welded, the best of iron or steel and of extra thickness being used, so that, when the tube holes are bored out, the required factor of safety is provided for. The tube holes are bored out at uniform distances apart and in regular order around the entire circumference of each section of the stand pipe, so that, when the radial tubes are properly secured in such holes, they extend uniformly from the stand pipe and avoid the formation of all fines of eXtra Width. The iiame and hot products are therefore distributed uniformly in contact with all the tubes about the standpipe, resulting in even heating of the tubes and regular circulation of water in the boiler, so that each tube will perform its full duty.

The number of sections may be increased or vdiminished at pleasure.

My improved round end Welded tubes are used in the stand pipe. The usual mud-drum L, with man-hole plate K, is formed at the lower end of the stand pipe. The steam drying tubes peculiar to my boiler are arranged at the top of the stand pipe and connected with the steam discharge pipe. The usual feed pipe and blow-off pipe connect with the stand pipe below the grate. The water-column pipe oc connects with the stand pipe below the grate and with the upper end thereof in the usual manner, and has connected at the junction of its horizontal and vertical portions a three-way valve, from which leads a discharge pipe into the ash-pit.

Having thus described my invention, what l claim, and desire to secure by Letters Patent is- Iii a radial tube boiler the stand pipe formed of one or more sections having vertical lap welded seams, the portion above the fire boX or deflector, c, having radial tubes set in close regular order around its entire circumference, and the fire box section or portion having circumferential corrugations, substantially as described.

yIn testimony whereof I-afiix my signature in presence of two witnesses.

EDWARD S. T. KENNEDY. Witnesses:

JOHN P. KENNEDY, LUTHER S. CoNKLIN.

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