US428631A - Steam-generator - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1.

N. W. PRATT. STEAM GENERATOR.

No 428,631. Patented May 27,1890.

WITNESSES.

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(No Model.) 2 Sheets- Sheet 2.

-N.- w. PRATT. STEAM GENERATOR.

No. 428,631. Patented May 27, 1890.

WITNESSES. [NVEzVTO/C.

A TTORNEY.

UNITED STATES PATENT OFFICE.

NAT. W. PRATT, OF BROOKLYN, NElV YORK.

STEAM-G EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 428,631, dated May 2'7, 1890.

Application filed January 28, 1888' fierial No. 262,210- (No model.)

, To all whom it may concern.-

Be it known that I, NAT. W. PRATT, a citizen of the United States, residing at Brook lyn, county of Kings, State of New York, have invented certain new and useful Improvements in Steam-Generators, of which the following is a specification.

This invention relates to sectional watertube steam-boilers wherein the heated furnace gases are passed between ranges of steam-generating tubesin a direction transverse to the tubes.

In order to enable others to understand and use my said invention, I will proceed to describe the details of its construction, and subsequently point out in the appended claims its novel characteristics.

Referring to the accompanyingdrawings, in which corresponding letters indicate like parts, Figure 1 is a longitudinal vertical section of a boiler constructed according to my invention, and Fig. 2 a front elevation partly in section on the line a: 00 of Fig. 1.

A A and A A are groups of generating water-tubes all connecting vertically by serpentine headers or at each end thereof, and by means of nipples b and c with one another, and by nipples d and ranges of tubes 6 with the manifoldsL of the steam-drums D.

O O are the combustion spaces or chambers between the said groups of generating-tubes, the same, as well as the interstices between the tubes, being divided by the central diaphragm B, faced with fire-brick or other suitable material, and extending transversely throughout the breadth of the boiler-space.

The range of heating-surface maybe extended by the employment of additional groups of tubes and combustion-spaces, the invention not being limited to the number shown.

The serpentine headers a interlock, as seen in Fig. 2, and form walls within which the draft-course is confined, the spaces between the nipples b and series of tubese being closed by fire-brick filling b and e, and in the instance of the opposite ends of the structures the draft being confined by the boiler-fronts and doors M. The draft-course is therefore directed upward from the furnace I, through the tubular groups A A and intervening combustion-space 0, through the combustionspace J, (as in common practice) thence downward through the tubular groups A A and intervening combustion-space Oto the point of delivery H,- which latter in the present instance of a battery of boilers traverses beneath the entire number, subsequently conducting to the stack or chimney.

The space N, back of each boiler independent of the draft-passages, serves the purpose of access to the hand-holes P opposite the tubes, whereby the products of cleaning are readily removed.

The water-tubes are inclined at substantially a common angle, in the manner usual in boilers of this class, so that upward circulation is promoted by the heat delivering the current to the front end of the steam-receiving drum D, thence to the rear and downward through the lower headers a. The mud-drum E, connecting transversely beneath the said lower header and having suitable blow-01f appliances, receives such water impurities as are separated by gravitation.

K are the steam-pipes connecting the drums D together and with the point of steam-delivery.

From the hoppers or reservoirs R R beneath the furnace ash-pits the accummulated ashes are removed by the leveroperating dumping device S, consisting of. a swinging lid pivoted at g and operated by the lever l.

T are receiving-chambers of suitable blowers, (not shown,) from which air-blast is admitted through dampers 2' to and beneath the grate-bars t to controllably accelerate the draft.

U is a regulating-damper, which maybe automatically or otherwise regulated to control the draft at its point of exit. The deliveryfiue O conducting to the main flue H is of a hopper shape, having inclined sides, and by closing the damper U acts as a receptacle for products of cleaning from the fines and chambers above, said products being removed through the door adjacent to said damper bya suitable implement introduced from the side.

The boiler-setting herein shown is especially adapted to the location of batteries of boilers in the successive stories of a building one above another. The walls "W are sustained upon the I-beams V, carried from the pillars F to and into the walls X, as the side or partition walls of the building. The transverse I-bcams G, extending between the beams V, sustain the furnace front-wall and bridgewall, as shown, the rear of the tubular strncture and the mud-drum being supported by the arch of the smoke-flue ll. The steamdruin D is suspended beneath each overhanging floor by rods Y, the weights of the several boiler structures being thus subdivided and distributed.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In combination with a water-tube steamboiler having an upward and downward draft across the tubes, a reservoir, ash-pit, a smokefiue, and a blast-pipe, all arranged substair the hopper when said closing-plate is closed. 30

NAT. W. PRATT. \Vitnesses:

(Jr-ms. L. MOELER, II. E. BUNKER.

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