US2203370A - Power boiler - Google Patents

Description

June 1940- E. H. TAYLOR 2,203,370

POWER BOILER Filed June 25. 193B 2 Sheets-Sheet 2 F161 HGlY.

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Patented June 4, 19 40 I om'reo STATES PATENT OFFICE 2,203,370 POWER. BOILER Ernest H. Taylor, Strcudsburg, Pa., assignor to The International Boiler Works 00., East Stroudsburg, Pa., a corporation of Pennsylvania Application June 25, 1938, Serial No. 215,788 2 Claims. (Cl. 122-140) This invention relates to boilers for generating adapted to be fired through a door opening 9 high pressure steam, of a type intended for use in its front end wall 2 near the top of the fire box more particularly in power plants. I; while the products of combustion leave by way In connection with boilers of the kind referred of an opening II] in the rear end wall 3 near the 5 to, I aim to secure a greater output of dry steam bottom and are exhausted through a connecting 5 per square footof heating surface than was posflue or chimney II. Extending longitudinally of sible heretofore without the use of special or the lower part of the combustion chamber I and additional super-heating means; to attain a maxconnecting the hollows of the end walls 2 and imum yield of dry steam with a minimum con- 3 are water tubes I2 which slope downwardly sumption of fuel; and to reduce the flue gas temsomewhat toward the front end of the boiler. A 10 perature to a minimum degree consistent with transverse diaphragm I3 of heavy refractory magood draft conditions. terial sets apart a firebox I4 in the top of the These objectives I realize as hereinafter more combustion chamber I, said diaphragm extending fully disclosed in a boiler wherein a continuous rearwardly from the front wall 2 and terminating water jacket extends over the top and down opposhort of the rear wall 3 of the boiler as shown in 15 site side walls of its combustion chamber; wherein Fig. II. About midway of the height of the lower a multiplicity of water tubes inclined somewhat subdivision of the chamber occupied by the tubes in respect to the horizontal, extend longitudinally I2, is a substantially horizontal bafiie It which of the combustion chamber beneath a diaphragm reaches forwardly from the rear wall 3 and terwhich sets apart a fire box in the upper portion minates short of the front wall 2. By virtue of 20 of said chamber and connects the hollows of this construction, a devious course is defined for opposite walls so that a ring circuit is estabthe heated gas of combustion in the lower sublished for the water; wherein the gases of comdivision of the firebox I as indicated by the full busticn emanating from the fire box are caused line arrows in Fig. II, the gases flowing between to follow a devious course,.with changed direcand along the tubes I2 throughout the length 25 ticn of flow between and along the water pipes, of the latter in opposite directions before passing enroute to a fiue outlet in one of the walls at into the flue II. In practice, the water is maina level below said pipes. tained approximately at the level shown at ll A further aim of my invention is to attain the in the upper arched hollow of the boiler, its cirabove advantages in a boiler which lends itself culation through the jacketing and tubing being 30 to manufacture from a small number of inter-. as indicated by the dotted line arrows in Fig. II. fitting components fashioned from sheet metal Water is introduced into the boiler at the front secured one to another in such manner as to end near the bottom through a pipe I8, see Fig. form. strong, rigid hollow steam power unit III; and the generated steam passes out of the capable of withstanding high internal pressures. top of the boiler at the center through a pipe 35 Other objects and advantages of my invention I9, see Figs. I and II. The boiler is also provided will appear from the detailed description of the at the top with a tapped opening 20 for connecattached drawings, whereof Fig. Iis a view, partly tion of a safety valve (not shown), and with a in plan and partly in horizontal section, of a tapped opening 2i which may be used for in-.

power boiler conveniently embodying the present stallation of a steam injector. The additional 40 improvements. tapped pipe openings shown at 22 and 23 re- Fig. II is a central longitudinal sectional view spectively at the top and at one side of the of the boiler drawn toa larger scale. boiler (Figs. I-III) are intended to be used for Fig. III shows the front or firing end of the connection of a water column. There is also boiler; and -a tapped opening for a fusible safety plug, which 45 Fig. IV is a tranverse sectional view of the latter is shown at 24 in Fig. II. In order that structure taken as indicated by the arrows IVIV the exterior surfaces of the tubes I 2 may be in Fig. II. cleaned when required from time to time an As herein shown, my improved power boiler opening 25 is provided in the side wall l of the has a combustion chamber I with jacketed front boiler, said opening being normally closed by a 5 and rear end walls 2, 3, jacketed side walls 4, 5 removable panel or door 26 which is preferably and a transversely-arched jacketed roof 6, the lined with refractory material after common prachollows of which are all directly communicative, tice in the art. the bottom or floor 7 of said box paved or lined In its construction, my improved boiler comwith heavy refractory material 8. The boiler is prises suitably shaped and spaced inner and outer 5,5

2 head sheets 21, 28 and 29, 30 of steel (Fig. 11) which respective pairs jointly form the hollow end walls 2 and 3; and suitably shaped and spaced enveloping sheets 3|, 32 likewise of steel, which jointly form the hollow side walls 4, 5 and the arched top 6. As shown, continuous inwardly-directed marginal flanges 21a, 28a. and 29a, 30a extending around the sides and top edges of the outerand inner head sheets 21, 28 and 29, 30 are overlapped by the side edges of the enveloping sheets 3! and 32. The water jacketing of the boiler is well reinforced by suitably allocated stay bolts 33 certain of which serve to unite the sheets 21, 29 and 3! at the regions of overlap; while rivets shown at 34 and 35 serveto unite the sheets 28, 30 and 32 at the regions of overlap. The arched portion of the outer enveloping sheet is additionally reinforced by diagonal braces shown at 36.-

The hollow end walls 2 and 3 are closed at the bottom by filler bars 31 and 38 respectively to which the sheets 21, 28 and 29, 30 are permanently secured either by riveting or welding. The jacketings of the side walls 4 and 5 are similarly closed at the bottom by fillers 39 and 40 respectively; and the four walls are joined at the bottom by a base plate M which is secured by screw bolts 52 engaging upwardly into the several filler blocks, see Figs. II and IV. At the door openings 9 and H), the edge margins of the head sheets 21, 28 and 29, 30 are directed inwardly toward each other into: abutting relation as shown and the abutting edges welded together as conventionally indicated at 43, M to form water tight joints. The opening 25 for the door or panel 26 in the side wall 4 of the boiler is similarly formed as shown in Fig. IV, and the inner abutting edges of the inwardly-directed margins likewise permanently united by welding. The water tubes I2 are accessible for internal cleaning or for removal when replacement becomes necessary, upon removing the screw plugs shown at from aligned openings in the outer head sheets 28 and 30 of the end walls 2 and 3.

From the foregoing it will be apparent that I have provided a highly efficient power boiler embodying in its construction but a few preformed parts which lend themselves individually to economical manufacture, and which, when assembled, form a strong, rigid and compact unit capable of resisting rupture or distortion under high pressures. Due to down draft and devious flow of the combustion gases between and along the length of the water tubes (which provide the greater part of the heating surface of the boiler) in the lower part of the firebox, most of the available heat is employed to the best advantage and the temperature of the gases reduced to a degree slightly above the dew point before being discharged into the flue. As a consequence I secure' a high output of dry steam with minimum consumption of fuel, and without requiring the aid of superheating tubes as ordinarily.

Having thus described my invention, I claim:

1. Apower boiler having a combustion chamber formed by a horizontal top wall, vertical side walls and vertical front and rear end walls; a continuous water jacket extending over said top and down said vertical front and rear end walls; a longitudinal diaphragm at an intermediate level forming the bottom of a firing chamber within the combustion chamber at the top, said diaphragm sloping upward slightly from the front end wall and terminating short of the rear wall,

with provision of a connecting passage between the upper and lower subdivisions of the com- F bustion chamber by the diaphragm; a second diaphragm below the first in parallel relation thereto but extending from the rear end wall and terminating short of the front end wall; a

multiplicity of water tubes connecting the hol- T lows of the opposite end walls, said tubes being inclined in parallel relation to the diaphragms and disposed, some above and others below the lower diaphragm; a firing opening in the front end wall above the upper diaphragm; and a flue opening in the rear end wall beneath the lower diaphragm.

2. A power boiler according to claim 1, in

which the water jacketing also extends down n the side walls of the boiler.

ERNEST I-I. TAYLOR.

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