US1051912A

US1051912A - Water tube boiler.

Info

Publication number: US1051912A
Application number: US70741912A
Authority: US
Inventors: Arthur D Pratt
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1912-07-03
Filing date: 1912-07-03
Publication date: 1913-02-04
Anticipated expiration: 1930-02-04

Description

A. D. PRATT.

WATER TUBE BOILER.

AYPLIOATION 211.31) 111111111 2.

H F j I 1/ INVENTOR Mam was era-res ERNIE OE NEW-YORK, IQ. Y., ASSIGNOR TO THE EBABCOCK & WILCOX COI- BANY, GE BAYENNE, NEW-JERSEY, LCOBBQBATQON OF. NEW JERSEY.

warez-ma norms.

I Specification of Letters ream.

Patented Feb. 4, 1913.

To all whom it may concern:

Be it known that I,- An'rHUR-D. Piwrr, a

citizen of the United States, residing in New- York city, borough of Manhattan,- in the county of New York and State of New York, i

ing a bank of inclined water tubes, are-symmetrically arranged above a common fuel chamber extending from one side of the boiler to the other and fired at both thefront and rear. The disposition of the boiler units provides an A-shaped combustion chamber of large volume, separate portions of the furnace gases being directed from the central combustion chamber in independent streams toward the outlet fines.

The invention will be understood by reference to the accompanying drawing which is a section through a boiler embodying the invention.

In the drawing I have shown two units each comprising a bank of inclined watertubes, the tubes 1 of the left hand unit being expanded into lower andupper headers 2 and 3, and the tubes 4 of the right hand unit being expanded into lower and upper headers 5 and 6. These headers extend transversely of-the boiler from one side wall of the setting to the other side wall. Each bank is divided by transverse bafiles 7 and 8, the battles 7 rising from bafiles 9 supported upon the lowermost row of tubes and extending from the lower headers toward the rear, thus providing a plurality of transverse passes for the gases across and around the tubes, as indicated by the arrows. The upper headers 3 are connected by short vertical pipes 10 with a longitudinal steam and water drum 11, and the latter is connected with the lower headers by pipes 12. The upper headers 6 are connected by short vertical pipes 13 with a longitudinal steam and water drum 14, and the latter is connected with the lower headers 5 by pipes 15. Walls 8' extend from the transverse battles 8 to the drums 11 and 14:, and inthe space between these walls and the roof of the setting above the banks of tubes, and above the first and second passes, are placed superheaters 16 and 17 of any approved type. In the form shown these conisist of transverse boxes connected by U- .sba-ped pipes, the upper boxes being conpected to the steam spaces of the correspond- ;ing drum.

The boiler units above described are suspended over a common furnace extending from the front to the rear of the boiler. In thedesign shown, the furnace is divided galong lts center by a low wall 18 extending ?transversely of the setting from one side wall to the other. This wall serves as a rear wall {for the two fuel bed sections, in this instance two chaln grate stokers, 19 and 20 of any apiproved construction, and operated independently of each other, one from the front and the other from the rear of the setting. The

fmud' drums 25 of the boiler are at the rear of and protected by the ignition arches 21 and 22.

The-two boiler units are so disposed relat1ve to each other that the upper headers 3 and 6 converge toward each other downwardly and their lower ends are in proximity to the central transverse vertical plane of the setting. There is thus provided a large A-shaped combustion chamber 23 common to the boiler units. To insure against burning the lower ends of the upper headers I nipple to said headers transverse boxes 24:, the lowermost row of tubes of the bank being expanded into said boxes and into the mud Y drums 25.

Inthe present design I connect the upper I headers. 3 and 6, through the boxes 24, by a series of shortcirculation pipes 26 covered by roof tiles 26. The A-shaped combustion chamber is therefore closed at the apex and is open only along the upper portions of the inclined sides thereof, that is, at the uptake ends'of the inclined tubes. The gases from the combustion chamber divided into separate streams, enter the banks of tubes at their uptake ends and, following the path indicated by the arrows, escape through the enced through a stream or lane of excess air or unconsumed combustible gases passing through the boiler and escaping to the stacks will be avoided.

The angle of inclination of the tubes and the heating surfaces is approximately 45 to the horizontal, and the planes of the upper headers approximately at an angle of 90 to each other. I do not however restrict myself to these angles, the essential feature being the disposition of the units relative to each other over a common furnace and combustion chamber to provide an I l-shaped combustion chamber of relatively large volume.

In my application Serial No. 707,420, filed July 3, 1912, I have described a water tube boiler of the same general type as described herein, the design shown in said application comprising a transverse drum at the apex of the combustion chamber to which the lower ends of the upper headers are nippled.

What I claim is:

1. In a water tube boiler, the combination of two units each comprising a bank of inclined water tubes, lower and upper headers into which said tubes are expanded, said units being so disposed that the upper headers converge toward each other downwardly, pipes connecting said upper headers with each other, drums located above and connected with the lower and upper headers of the corresponding unit, and a central combustion chamber common to said units.

2. In a water tube boiler, the combination of two units each comprising a bank of inclined water tubes, lower and upper headers into which said tubes are expanded, said units being so disposed that the upper headers converge toward each other downwardly, pipes connecting said upper headers with each other, and a bathe in each unit extending from the lower header toward the upper, whereby an A-shaped combustion chamber is provided common to the two units and open to the gases along the upper portions of the inclined sidesthereof, and a furnace chamnoaneia ber extending from the front to the rear of theboiler.

3. In a water tube boiler, the combination of two units each comprising a bank of inclined water tubes, lower and upper headers into which said tubes are expanded, said units being so disposed that the upper "headers converge toward each other downwardly, pipes connecting said upper headers with each other, superheaters above said banks of tubes, and a central combustion chamber common to said units.

4:. In a water tube boiler, the combination of two units each-comprising a bank of in clined water tubes, lower and upper headers into which said tubes are expanded, said units being so disposed that the upper headers converge toward each other downwardly, pipes connecting the lower ends of the upper headers, transverse baflies dividing said banks into a plurality of passes beginning at the steam uptake ends, and a baffle extending from therearward to the first pass, whereby an Ah-shaped combustion chamber is provided common to the two units and open to the gases along the upper portions of the inclined sides thereof, and a furnace cham-.

ber extending from the front to the rear of the boiler.

5. In a water tube boiler, the combination of two units each comprising a bank of inclined Water tubes, lower and upper headers into which said tubes are expanded, said units being so disposed that the upper head- ARTHUR l).- PRATT.

Witnesses:

CHAnLns A. Joints, M. E. ll/lohlmon.