US1826029A - Waste heat boiler - Google Patents

Description

Get. 6, 1931. SMITH 1,826,029

WASTE HEAT BOILER Filed Jan. 25, 1926 4 Sheets-Sheet l INVENTOR 5 By Q%%ww/ 7i/M A TTORNE m Oct 6, 1931. sMlTH 1,826,029

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WASTE HE AT BOILER Filed Jan. 23, 1926 4 Sheets-Sheet 3 Mm l/VVENTOR W M A TTORNE Vs H. B. SMITH WASTE HEAT BOILER Oct. 6, 1931.

Filed Jan. 23, 1926 -OOO N OO

I ooooood 4 Sheets-Sheet 4 OOOOOO oooooo' INVENTOR A TTOR/VEZS Patented Oct. 6, 1931 d UNITED STATES PATENT OFFICE HERMAN B. SMITH, OF PLAINFIELD, NEW JERSEY, ASSIGNOR TO THE BABCOGK &

WILCOX COMPANY, OF BAYONNE; NEW JERSEY, A CORPORATION OF NEW JERSEY WASTE HEAT BOILER Application filed January 23, 1926. Serial No. 83,187.

' This invention relates to a boiler for utilizing waste heat gases as, for example, gases from open-hearth furnaces, for generating steam, and will be understood from the de scription in connection with the accompanying drawings, in which Fig. 1 is a side elevation of the boiler, partly in section; Fig. 2 is a section along the line 22 of Fig. 1; Fig. 3 is a section along the line 3 -3 of Fig. 1

i, with the. superheater tubes omitted and Fig. dis a side view on an enlarged scale, partly in section and partly broken away..

In the drawings, reference characters l and 11 indicate upper and lower drums having their axes in substantially the same plane I that are connected by banks 13 and 14 of tubes, that are divided longitudinally into two groups with a space between the groups longitudinally of and located between the drums l0 and 11. Thedrums and tubes are surrounded by a casing 15, that is provided withan inlet 16 at its front end for hotgases, and an outlet 17 at the other end for the same. The casing is provided along the bottom thereof with soot 'pockets 18. The banks of tubes are not only spaced so as to leave the space 19 between the,banks, but each bank is also divided into groups with a similar num- 'ber of tubes in each front group, thus leave ing a space 20 transversely across the casing between the tubes, to form a superheater chamber. I

A pipe 21 extends from the steam space of the upper drum 10 from the dry pipe 22 to 5 the'inlet header 23 of the superheater. The

outlet header 24 of the superheater is 'connected to "the header 23 by a plurality of U- .tubes 25 that are located in the space 20 be- 6 tween the groups of tubes 13 and 14, and extend transversely across the casing, as indicated. The superheater headers may be horizontally disposed, and the U-tubes vertically disposed, as shown, or the superheater headers may be arranged vertically and located outside the casing with thesuperheater tubes horizontal.

Baflles 26 may be attached to the tubes and extend between the drums 10 and 11 and close the space'19 betweenthe groups of tubes 13 and 14, thus preventing the gases from laning through the space between the tubes. A feed water inlet 27 is shown by which the feed water is introduced into the water space at the rear or cool end of the upper drum 10. The curved plate 28 is provided as a splash plate, and the flow of water through the tubes will be as is indicated by the arrows in Fig. 4, with the water flowing downwardly through the rear tubes and upwardly through the front tubes at the hot or front end of the boiler. The drain pipe 29 is shown leading from the bottom of the mud drum 11, and the boiler may be provided with safety valves 30. o

The operation is as follows: Hot gases are introduced from some external source of heat into the casing through the inlet 16, and flow longitudinally. between the drums 10 and 11 in contact with the front group of w tubes, and then over the tubes of the superheater, and thence over the other tubes of the groups 13 and 14. The tubes 13 and l4, as well as the U-tubes of the superheater,

are preferablystaggered, and after the gases pass beyond the superheater, and a'few of the tubes 13 and 14 therebehind, they are diverted from the space 19 by means of the baflles 26, so as to force the same to flow over the remaining tubes of the groups 13 and so 14. Some of the gases which contact with the superheater flow through the space between the groups of tubes, and contact with the superheater before being cooled by the tubes 13 and 14:, thus giving up sufiicient heat to the superheater to raise the steam therein to the desired temperature.

I claim: I

In combination, a boiler comprising an upper and a lower drum having their axes disposed substantially in the same plane, a casing enclosing the boiler and forming a single straight gas pass longitudinally of said drums with an inlet and an outlet adjacent opposite ends of the drums, said inlet adapted to be connected to a source of heat outside the casing, two banks of'tubes connecting the drums and disposed on opposite sides of said plane and spaced apart, bafiles disposed in said space to prevent laning of gases therethrough, the tubes in said banks ein arranged in groups spaced lengthwise of t e drums, and a superheater extending transversely of the drums and disposed in spaces between said groups and across the space between said banks.

HERMAN B. SMITH.

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