Jm'14’1947' I 5. wt. FLEMING ‘ ' _ 2,414,148‘ VERTICAL SETEAM BOILER Filed March 20, 1945 20' _ A 2/ 24' Attorney Patented Jan. 14, 1947 ' 2,414,148 UNITED STATES PATENT OFFICE 2,414,148 VERTICAL STEAM BOILER Samuel William Calderwood Fleming, Strathaven, Scotland Application March 20, 1945, Serial No. 583,805 In Great Britain February 28, 1944 3 Claims. (Cl. 122-166) 2 This invention relates to steam boilers of the so-called vertical type, that is to say steam boilers whose internal components are built inside a shell structure the main axis of which is vertical. The invention is especially intended for appli cation to small-output steam boilers such for ex ample as would be used for the propulsion of small steam ships and for auxiliary purposes on large ships. shell portion lc but connected with the chamber 3 by an internal ?ue 9, and an uptake Illa, lllb provided on the shell exterior in register with the chamber 3. The arrangement is such that the hot products sweep across the water tubes in their ?ow from the ?ue around the annular com bustion chamber to the uptake. The shell has slightly domed top plate I I. In the example, the downcomer 2 is cylindrical The object of this invention is to provide a 10 and is set eccentrically in the shell I so that as water-tube steam boiler of the type stated which hereinafter more fully explained, the cross-sec will be simple in construction and e?‘icient in tional area of the combustion chamber 3 gradually use and which can be designed for any given reduces as between the vicinity of the ?ue 9 and small output to have reduced overall dimensions the vicinity of the uptake. The arrangement is rendering such a boiler suitable for installations 15 such that the rate of reduction in cross-section in places where space is an important considera corresponds to the estimated reduction in volume tion. of the products in the chamber as they lose their ' Another object is to provide a water-tube steam heat, so that there will be substantial uniformity boiler in which an internal ?ue leads from the in the speed of the hot products through the furnace into an annular combustion chamber at 20 chamber. . one side thereof, an uptake for the hot products The smokebox portion l?b of the uptake is built from the chamber is arranged at the side of the on the shell portion lb about midway of the chamber opposite the fine and an internal down~ height of the shell. The chamber forming the comer between water spaces respectively above furnace 'l is built into the bottom of the shell, and below the chamber is oiTset in relation thereto being roughly hemispherical in form. ‘The in so that the cross-sectional area of the chamber ternal ?ue 9, which may be elliptical, as Fig. 3 reduces between the ?ue side thereof and the ' shows, or cylindrical, is arranged in the same uptake side thereof. The arrangement is such central vertical plane 13-13 (Fig; 2) as the uptake that the hot products sweep with substantially and is built at an upward and outward inclina uniform speed across water tubes extending be 30 tion at the side opposite the uptake between the tween said water spaces in the ?ow of such prod furnace chamber top and the lower-of the two ucts from the ?ue around the annular combus» horizontal tube-plates 4 and 5. The down» tion chamber to the uptake. comer 2 is a vertical-axis cylinder extending from The invention will now be described by way of one tube-plate .to the other and having its axis example with reference to the accompanying offset from the boiler shell axis A—A towards the drawing, in which uptake. Thus, the annular passage constitut ing the combustion chamber 3 formed by the according to the invention, the section being on downcomer cylinder 2 and intermediate shell por the line I-~I of Fig. 3. tion l b at the sides and by the tube-plates 4 and 5 Figs. 2 and 3 are fragmentary sections on the 40 at the top and bottom varies gradually in cross lines II-—II and III-III of Fig. 1 respectively. sectional area from a maximum above the flue The steam boiler shown is of the so-called to a minimum beside the uptake. The water vertical type, that is’ to say its internal com tubes 6 in the combustion chamber are arranged Fig. 1 is a sectional elevation of a steam boiler ponents are built inside a cylindrical shell la. lb and lo the axis A—A of which is vertical. v The therein as two banks of short straight vertical tubes, and these include a suitable proportion said components comprise an internal downcomer of stay tubes, all the tubes being equal in length 2, an annular passage within the intermediate and being connected, in usual manner, at their shell portion lb forming a combustion chamber top and bottom ends to the tube-plates, being 3 (Fig. 3) for the hot products between the down insertable and withdrawable through the upper comer 2 and the shell, said chamber being bounded 50 tube-plate ll. Each of the two banks of tubes top and bottom by tube-plates 4 and 5, respec extends in an are (as viewed in plan, Figs. 2 and 3) tively, upcomers in the form of water tubes 8 from one side of the ?ue 9 to the uptake. Between extending through the chamber 3 from tube the lower tube-plate 5 and the furnace top there plate to tube-plate, a furnace 1 separated from is the lower water space 8. The hemispherical the chamber 3 by a water space 8 within the lower 55 form of the furnace chamber surmounts an 2,414,148 4 annular pocket 8a as the lowest portion of the lower water space. Between the upper tube plate 4 and the boiler top H, the upper shell portion la encloses a drumlike water and steam space [2, The annular passage, in view of its function as the combustion chamber 3, is lined around the downcomer '2 in proximity to the ?uelf; with fire bricks l'3 that-are'held in place by adjacent water tubes 6; and the chamber 3 is lined around the shell portion lb by ?rebricks l4. These bricks l'éi ‘ are held by bolts Ma to the portion lb, which vis a casing composed of detachable plates flange which the steam generated has practically un restricted discharge. I claim: “ l. A steam boiler comprising an outer shell structure, an internal downcomer, an annular passage forming a combustion chamber for the hot products between said downcomer and the shell structure, tube-plates secure'dto said shell ‘structure and arranged to bound said chamber . top and bottom, upoomers in the form of water tubes extending through said chamber from one of said tube-plates to the other, a furnace sepa rated from said chamber by a water space, an jointed together (Fig. 3). The upper tube-plate 4 is stayed by gussets ‘l 5 above the ?ue 9. internal ?ue connecting said furnace with said chamber, and an uptake provided on the shell In the shell there is a mandoor 16 above the upper tube-plate and there is also a mandoor ll’ ‘downcomer being offset from the axis of said shell . The boiler would have the usual mountings, space, an internal flue connecting said furnace structure in register with said chamber, said structure so that the cross-sectional area of said below the lower tube-plate, so that the ‘interior ‘ chamber ‘reduces between the vicinity of said of the boiler is all accessible for cleaning, inspec~ 20 ?uid and the vicinity of said uptake. tion and repair. The refractory bricks i ii and the 2. A steam b'oi'ler of the type having a vertical cylindrical shell structure, comprising an internal plating of the casing I b, being removable, permit cleaning of- the ?resurfaces of the ‘tubes and tube downcomer formed ‘as a vertical cylinder, an annular passage forming a combustion chamber plates. Likewise, the front plating Hie oi‘ the smokebox is removable. 25 for the hot products between said downcomer At the lowest points of the lower water space S, and said shell structure, tube-plates secured vto that is on the annular pocket 8a, there are ?tted said shell structure and arranged to beundsaid a blow-down valve ISand a wash-out plug ! by chamber top and bottom, .upco'mer‘s in the fer-in of water tubes extending through said chamber virtue of which latter the boiler interior can be completely ‘drained of all water and sediment 30 from one of said tube-plates to the ‘other, a fur after cleaning. nace separated from said chamber by a water including a stop-valve (not shown) on the steam with said chamber, ‘and an uptake ‘provided on the shell structure in register with said chamber, steam collector 2|, and a feed-water check-valve 35 the cylindrical downcomer being eccentric to said (also not 'shown) on the feed inlet facing 22. shell structure so that the cross-sectional area The feted-water‘in the example is led from the of said chamber reduces between the vicinity of inlet 22 by a pipe 23 through the lower water said ?ue and the vicinity of said uptake. outlet ‘facing 20, which is ?tted with the usual space 8 to the downcomer 2. The pipe 23 rises up 3. A steam boiler comprising a shell structure one side of the downcomer and spreads in arcuate 40 composed of an upper portion enclosing a water perforated arms 24 around part of. the inner and~steam space, a lower portion enclosing a periphery of the downcomer top end. ‘It will be noted that'the wall of the furnace ‘i abuts against a cylindrical soleplate ‘la extending beyond the annular pocket 8a to provide the sup port of the boiler shell and to serve as an ashpit below the ?rebars 25 of the furnace. In use of the boiler, the water from the per forated arms .24 ?ows down the downcomer cylinder 2 into the lower water space 8, whence it rises through the vwater tubes 5 to the water and-steam space l2 above, returning downwards with still incoming feed water and continuing to circulate in this way. The hot products from the furnace 1 pass up the ?ue 9 into the combustion chamber 3 along which they sweep horizontally in both directions amongst the water tubes to the uptake l0, into which they are guided by curved plating 2B. The ef?ciency of the boiler is due largely to the arrangement whereby the hot products sweep at right angles across the water tubes and the arrangement of short straight vertical tubes from water space and an intermediate cylindrical cas ing, upper and lower tube-plates forming the bot tom and top of said spaces respectively, a cylin drical internal downcomer interconnecting said spaces and forming with said tube-"plates and intermediate casing a combustion chamber that extends round said downcomer, upcomers in the form of water tubes extending through'said cham ber from one of said tube-plates to the other, a furnace built into the bottom of said lower por tion of the shell structure, an internal ?uid lead ing from said furnace through the lower of said tube-plates into said chamber, ‘and an uptake for products from said chamber, said uptake being arranged at a side of said chamber opposite said ?ue and said'downcomer being eccentric to said casing so that the cross-sectional area'of ‘said chamber reduces between the ?ue side of said chamber and the uptake side thereof. SAMUEL WILLIAM _ l _ CALDEHWOGD FLEMING.