US680593A - Steam-generator. - Google Patents

Description

STEAM GENERATOR.

(Application filed Mar. 18, 1901.)

4 shans-sheet (No Model.)

fl a U ll MUAHHH lll No. &80,593. Patented Aug. 3, eo.

' w. HOBNSBY & D. ROBERTS.

STEAM GENEBATOR.

(Application filed Mar. 18, 1901.

4 Sheets-Sheet 2.

I (No Model.)

OOOO

. O. w a

O OOOOO M ,w 'I A &Law 'V 1" QMW No. 680,593. Patented Aug. !3. 1904.. W. HORNSBY &. D. ROBERTS.

'STEAM GENERATOR.

(Appcation filed Mar. 18, 1901.)

No Model.) v

mms

m: NORRIS perms coi mo'rum No. 680,593.- Patented Aug. !3, !901.

W. HORNSBY & D. ROBERTS. STEAM'GENERATOB.

(Application fllad Mar. 18, 1901.)

4 Sheets-Sheet 4.

(Holanda-li i? -OOOOOOO O'OOOOOOO OOOOOOO J.- o KQ o o o o o o o o o o o o o HHHHHHHHHH 'UNITED STATES,

PATENT OFFICE.

WILLIAM HORNSBY AND DAVID ROBERTS, OF GRANTHAM, ENGLAND.

STEAM-G EN ERATO R.

SPECIFICATION forming part of Letters Patent No. 680,593, dated August 13, 1901.

' Application filed March 18, 1901.

To all w/wm 't may concerns Be it known that we, WILLIAM HORNSBY and DAVID ROBERTS, subjects of the King of' Great Britain, residingat Spittlegate Iron lVorks, Grantham, England, have invented new and useful Improvements in Stean-Generators, of which the following is a specification.

This invention relates to improvements in steam-generators, and has for its object to insure the development of more power upon a given floor-space and also greater efficiency than is possible with .steam -generators as leretofore usually made.

The invention is applicable to steam-generators of the water-tube type, as constructed with a series of straight, inclined, or curved tubes over a furnace, either or both ends being suitably connected to a steam and water drum or drums.

According to this in vention We arrange one or more furnaces, each' with its own ash-pit, below the usual furnace and ash-pit, the gases from the lower furnace or furnaces passing into and through the combustion-chamber and thence over the heating-surface of the boiler. To obtain more heating-surface, we make the headers with extra rows of tubes in height or depth, and we may also arrange over the lower furnace or furnaces one or more rows of tubes, which may be connected to the usual slab or sectioual headers so as to form part of the boiler. On some of the tubes over the furnace We place fire-clay tiles or specially-shaped fire-clay bricks, so' as to cause the gases to travel over the bridge-wall of the furuace into the oombustion chamber or chambers before passing upward over the heating-surface of the boiler. A series of suitable battles is arranged so as to cause the gases of combustion to circulate over the whole of the heatingsurface (and superheater, if used) before passing to the chimney.

When boilers such as those previously described are fitted with superheaters, instead of placing the su perheater in the usual position-7l. e., inmediately under the steamdrum and above the tubes and using one stack of tubes -we divide the tubes into two stacks and place the superheater between them, so that it will be subjected to the action of hot- Serial No. 51,716. No model.)

ter gases of combustion than it would be when placed in the ordinary position.

In .the accompanying drawings, Figure 1 is a sectioual elevation of a stean-generator having our improvements applcd thereto. Fig. 2 is a cross-section on the line 2 2, Fig. 1.

Fig. 3 is a cross-section on the line 3 3, Fig. '1.

Fg. 4 is a front elevation of the generator. Fig. 5 is a View, similar to Fig. 1, of a generator having a superheater arranged according, to the invention. Fig. (5 is a crosssection on the line 6 6, Fig. 5. Fig. 7 is a cross-section on the line 7 7, Fig. 5, and Fg. 8 is a front elevation of the generator.

Referring first to the arrangement illustrated in Figs. l to 4 of the drawings, a is the upper furnace of the generator, and b is its ash-pit. -c is the lower f urnace, and d the ashpit thereof, said furnaces having in rear there- .both furnaces to cause the gases from both upper and lower furnaces to pass over the -bridges and into and. through the combustioncham ber and thence over the heating-surface of'the boiler in the usual manner. fis the steam and water drum, g g are the Watertubes over the upper furnace a, and h and 'i the front and back headers, respectively, to which the said tubes are connected. j j are the tubes arranged between the upper and lower furnaces. k is the front header and Z the back header and mud-drum, to which the said tubes are connected. The header h is con- 11 ected to the steam and water drnmfby the nipples m m and to the header k by the tubes nn, while the header and mud-drum lare connected to the header i by the tubes o o and to the steam and water drum f by the tubesp 19.

Referring now to the arrangement shown in Figs. 5 to 8, the same letters of reference designate the same parts asin Figs. l to 4, and the arrangement of the furnaces, ashpits, combustion-chambers, stoking-levels, and boiler generally is also the same, with the eXception that the headers h and and tubes g are divided into two stacks, the divided headers being connected by the nipples q q and r r, respectively. s is the su- IOO perheater, placed between the stacks of tubes g. t is the steam-inlet and u the steam-outlet fron the snperheater. o and 'w are stopvalves, and w is the steam-supply pipe from the generator. By regnlating the stop-valves 1; and w either satnrated, superheated, or mixed steam passes into the said supply-pipe a). By arranging the superheater between the divided stack of tubes it will be subjected to the action of hotter gases than is the case when it is placed immediately under the steam and water drum in the usual manner.

Having now particularly described and asce'tained the nature of our said invention and in what manner the same is to be performed, we declare that what we claim is- 1. In a steam-generator, the combination with two fnrnaces arranged one above the other and a common combnstion-chamber communicating with both fnrnaces, of aboiler comprising a steam-drum, a water-tube section located above the upper furnace and connected with the steam-drun and a watertube section interposed between said furnaces, connections extending therefrom to the upper water-tube section from said lower tube-section directly to the steam-drum, substantially as described.

2. In a steam-generator, the conbination with two furnaces arranged one above the other and a common combustion-chamber communicating with both furnaces, and a deflecting-plate above each furnace extending from the front thereof to the combustionchamber, of a boiler comprising a stean-drum, a water-tube section located above the upper fu rnace and connected with the steam-drum, a water-tube section located above the lower furnace, connections from said lower watertnbe section to the upper water-tube section and' direct connections from said lower waler-tube section to the steam-drnm, said water-tube sections extending 'earwardly into and over the combustion-chamber, substantially as described. t

3. In a stean-generator, the combination with two fnrnaces, arranged one above the other and a common combustion-chamber commnnicating with both furnaces, of a boiler comprising a steam-drum an upper watertube section located above the npper fnrnace, said section being divided horizont-any into two parts and connected with the steam-drnm, asuperheater arranged between the two parts of the u pper water-tu be section and connected With the steam-drum, a lower Water-tu be section interposed between the two furnaces, connections extending therefrom to the npper water-tube sections and direct connections eXtending from said lower water-tube section to the steam-drnm, substantially as described.

4:. In a'steam-generator, the combination with a fnrnace and combustion-chamber, of a boiler comprising a steam-drum, a watertube section formed in two horizontal parts and connected to the steam-drum and a superheater interposed between the parts of the water-tube section and connected with' the steam-drum, snbstantially as described.

VVILLIAM HORNSBY. DAVID ROBERTS.

Witnesses:

SAMUEL WILLIAM PAYNE, ROBERT ABLEWHITE BROWN.

Images