US1839125A

US1839125A - Steam boiler

Info

Publication number: US1839125A
Application number: US247486A
Authority: US
Inventors: Herman B Smith
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1928-01-18
Filing date: 1928-01-18
Publication date: 1931-12-29
Anticipated expiration: 1948-12-29

Description

H. B. SMITH STEAM BOILER Dec. 29, 1931.

Filed Jan. 18. 1928 3 Sheets-Sheet INVENTOR 1 W/EM 769;, ATTORNEYS Patented Dec. 29, 1931 UNITED STATES A PATENT OFFICE HZEBMAN B. SMITH OF I'LAINFIELD, NEW JERSEY,AS8IGNOR TO THE BABGOCK WIL- x COMPANY, OF BAYONNE, NEW JERSEY A CORPORATION OF NEW JERSEY arm norms.

Application fledlanuary 18, 1928. Serial No. 247,486.

My invention will best be understood by reference to the accompanying drawings, in which Fig. 1 is a longitudinal vertical section of a, boiler embod ing my invention taken along the plane 0 the line 11 of Fig. 2; Fig. 2 is a transverse section taken on the line 22 of Fig. 1; Fig. 3 is a'fragmentary section similar to Fig. 2, and showing a portion of Fig. 2 on a larger scale; Fig. 4 is a section taken on the line 4-4 of Fig. 3, and Fig. 5 is a section taken on the line 5.5'of Figs. 1 and 3.

Like reference characters indicate like parts throu bout the drawings.

. Re erring now to the drawings, is an upper steam and water drum, and 11 and 12 are lower spaced water drums preferably arranged substantially parallel to the steam and water drum and connected thereto by water tubes indicated generally at 13. Thetubes '13 are preferably straight and vertical and substantially parallel throughout the major ortion of their lengths as at 131, as 1nicated in Figs. 4 and 5, the tubes bein arranged in rows extending transversely o the boiler, the tubes of each row lying in a plane which is preferably substantially at right angles to the drums, and the tubes of one row preferablybeing staggered with respect to those of an adjacent row as illustrated in Fi 3.

llie lower ends of the tubes are bent outwardly as illustrated in Figs. *1 and 5, both ends of all the tubes preferably entering the drum radially. e

In the embodiment of my invention illustrated, the tubes are divided into groups,

and, in the arrangement shown, there arefour rows of tubes in the front group of tubes 133, which are located in front of a su erheater indicatedgenerally at 15. The tubes of the group 133 are preferabl uni fonnlyaglspaced transversely of the b0 er as are thefitnbes of the remaining groups-i 'l'he second'group of tubes 134 are arranged at the rear of the su rheater 15, and are also unitransversely of the boiler.

I tudinally of the boiler, as best shown in Fi s.

2, 3 and 5, the space between the two banks being spanned by a plurality of bafiies 14 extendlng from the lower portions of the tubes to the top of the boiler, as indicated in Fig. 5, and which are located suflicientl close together to prevent any substantia short circuiting of the gases through the space between the two banks. The tubes of the outer rows are preferably located substantially in the same planes adjacent to the setting, thereby permitting the inner wall of the setting to be substantially flat throughout.

I have indicated generally at 15 a supheater comprising an inlet header 16 and an outlet header 17, the inlet header being connected to a dry pipe 18 in the top of the steam and water drum 10 by one or more pipes 19. The headers of the superheater are connected by tubes 20, which are here shown as arranged in three rows extending downwardly from the headers into the space between the front group 133 andthe second group 134 of water tubes. A bafile 21 referably extends upwardly from the outlet eader 17 throu h the flue to revent short circuiting of t egases from t e su erheater.

, While,as state my invention is not limited thereto, it is particularly applicable for use with waste heat gases, which, in some cases, ma carry a considerable amount of dust, sue for example, as cement dust. 1" have shown a flue22 which may carry such waste heat gases and which pass in succession, in a single pass, over the front group of tubes 133, the tubes of the su rheater 15, the second and third groups 0 tubes, and leave the boiler through a gas exit 23located below a baflie 24 that extends downwardly from the roof, as best shown in Fig. 1. The purpose of ilroviding an'exit 23 at the lower portion of t e last tubes 'of the pass is to prevent an accumulation of a layer of dead, or nearly dead, gases at the. bottom of the boiler. When the gases flow rather'sluggishly over the tubes. of the boiler, there is a tendency for the cooled gases, particularly towards the end of the pass, to settle in the'bottom of the boiler and form a more or less dead layer; that is to say, a layer that does not move as rapidly as the other gases. By providing a as exit at the lower portion of the pass as illustrated, any cooled gases at the lower portions of the tubes are forced to pass over the tubes, and the gases are thereby revented from forming a more or less dea layer of the character above indicated.

After leaving the gas exit 23, the gases are directed upwardly by an inclined plate 25, and pass downwardly over the tubes 26 of an economizer which, in the embodiment illustrated, are bent back and forth in rows transversely of the flue 28 in which the economizer is located in a manner not illustrated in the drawings. The lower ends of the economizer tubes are connected to an inlet header 27, and the upper ends thereof are connected to an outlet header 29. The gases 'may be drawn through the boiler and the economizer by a fan 30 (see Fig. 2).

Beneath the boiler, is preferably located a hopper-shaped dust receptacle 31 to the bottom of which is connected a plurality of chutes 32 for the removal of dust and ashes from the receptacle 31.

A plurality of spaced bafiies 33 extend upwardly from the bottom of the dust receptacle 31 between the lower ends of the tubes sulficiently to prevent the gases from being short circuited around the tubes through the dust receptacle itself. These bafiles, of course, closely surround the drums 11 and 12.

A feed pipe for the boiler is indicated at 34.

The operation of the boiler. embodying my invention will be readily understood from the foregoing description and is as follows:

Gases, which may consist of waste heat gases, enter the boiler through the flue 22, and pass in a direction generally indicated by the'arrows. As the gases impinge against the tubes, the movement of a portion of the gases is retarded, and an opportunity is afforded the dust, which'is carried by the gases, to separate from the gases, and such separation is progressive as the gases pass from row to row of tubes. The arrangement of the tubes in planes transversely of the boiler, and with the major portions of the tubes vertical and the lower ends bent outwardlyaway from the center and towards the drums, provides an advantageous arrangement for the sep aration of dust from the gases. The dust tends to separate in the manner above indicated, and such separation is further facilitated by the fact that the tubes are vertical for the major porton of their lengths and do not form shelves on which the dust can accumulate Furthermore, bending the bottoms of the tubeslaterally towards the drums, provides a free space at the bottom through which the dust so separated can drop into the hopper-shaped dust receptacle.

After the gases have been largely deprived of their heat in the boiler, they pass over the economizer and to the outlet flue.

Spacing certain of the tubes over which the gases last pass in the manner described, provides a decreased flow area for the gases, which promotes the heat exchange from the gases to the fluid in the tubes. It will, of course, be understood that other means could be utilized for producing such decreased flow area.

I claim:

1. In a steam boiler, an upper drum, two lower spaced drums substantially parallel to the upper drum and connected thereto by water tubes, means for causing the gases to flow over the tubes in a single pass in a direction substantially parallel to the drums from the front to the rear of the boiler, certain tubes over which the gases last pass being divided into two spaced banks longitudinally of the boiler, and spaced baflles extending transversely across the space between said banks, the spacing and diameter of the tubes being such that a decreased fiow area for the gases is provided in the direction of their ow. r

2. In a steam boiler, an upper drum, two lower spaced drums substantially parallel to the upper drum and connected thereto by water tubes, the tubes being arranged in planes substantially at right angles to the drums and the tubes for the major portion of their len ths being straight and substantially paral el and uniformly spaced transversely of the boiler, the tubes over which the gases last pass being divided into two spaced banks, spaced baflies extending transversely across said space, whereby a decreased flow area for the gases is provided, and means for causing the gases to flow over the tubes in a single pass .in a direction substantially parallel to the drums.

3.'In a steam boiler, an u per drum, two

lower spaced drums substantially parallel to the upper drum and connected thereto by water tubes, the tubes being divided into two banks spaced transversely of the boiler 11 free space-being provided beneath the tu s for the reception of dust, spaced bafiles extending transversely across the space between the banks of tubes and other spaced bafiles between said lower spaced drums and extending across the free space beneath the tubes. 4. In a steam boiler, an n per drum, two lower spaced drums substantially parallel to the upper drum and connected thereto by water tubes, the tubes divided into two banks spaced transversely of the boiler, a free space being provided beneath the tubes for the reception of dust, spaced baflles extending transversely across the space between the banks of tubes and other spaced bafiies between .said lower spaced drums and extending across the free space beneath the tubes and u wardly among'said tubes to a point above t e lower ends of the first-mentioned bafiles.

.5. In a steam boiler, an upper drum, two

lower spaced drums substantially arallel to the upper drum and connected t ereto by water tubes, the tubes being divided into two banks spaced transversely of the boiler, a free space being provided beneath the tubes for the reception of dust, spaced baflles extending transversely acrossthe space between the banks of tubes and other spaced baflies between said lower spaced drums and extending across the free space beneath the tubes and upwardly among said tubes to a point a short distance only above the lower ends of said tubes.

6. In a steam boiler, an upper drum, two lower spaced drums substantially parallel to the upper drum and connected thereto by tubes, and means for causing the gases to flow over the tubes in a single pass in a direction substantially parallel to the drums from front to rear of the boiler, some of the tubes over which the gases last pass being divided into two spaced banks longitudinally of the boiler and arranged with baflling efiects transversally with respect to the space between said banks, the arrangement of the tubes also providing a decreased flow area for the gases in the direction of their flow.

HERMAN B. SMITH.

lower spaced drums substantialliy arallel to the upper drum and connecte t ereto by water tubes, the tubes being divided into two banks spaced transversely of the boiler, a free space being provided beneath the tubes for the reception of dust, spaced bafiies extending transversely across the space between the banks of tubes and other spaced baflles be tween said lower spaced drums and extending across the free space beneath the tubes and upwardly among said tubes to a point a short distance only above the lower ends of said tubes.

6. In a steam boiler, an upper drum, two lower spaced drums substantially parallel to the upper drum and connected thereto by tubes, and means for causing the gases to flow over the tubes in a single pass in a direction substantially parallel to the drums from front to rear of the boiler, some of the tubes over which the gases last pass being divided into two spaced banks lon itudinally of the boiler and arranged with baflling effects transversally with respect to the space between said banks, the arrangement of the tubes also providing a decreased flow area for the gases in the direction of their flow.

HERMAN B. SMITH.

csarmcnre or CORRECTION.

Patent No. 1, 839,125.

HERMAN B. SMITH.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

first paragraph of the specification:

Myinvention is particularly applicable to wasteheat boilers. although it is to be understood that my invention is not limited to this application.

and that the said Letters Patent should be read with this correction therein that the same may conform [0 the record oi the case ,in the Patent Office.

Signed and sealed this 16th day of February,

(Seal) M. J. Moore, Acting Commissioner of Patents.

Granted December 29, 1931, to

Page I, insert as the CERTIFICATE OF CORRECTION.

Patent No. 1,839,125. Granted December 29, I931. to

HERMAN B. SMITH.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page I, insert a the first paragraph of the specification:

My invention is particularly applicable to waste heat boilers, although it is to be understood that my invention is not limited to this application.

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 16th day of February, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents.