US2560275A

US2560275A - Baffle for boiler tubes

Info

Publication number: US2560275A
Application number: US9572A
Authority: US
Inventors: Stanley J Clark
Original assignee: Acme Tank & Welding Co
Current assignee: Acme Tank & Welding Co
Priority date: 1948-02-19
Filing date: 1948-02-19
Publication date: 1951-07-10
Anticipated expiration: 1968-07-10

Description

Jul 10, 1951 v J, CLARK $560,275

BAFFLE FOR BOILER TUBES Filed Feb. 19, 1948 "INVENTOR. Sway/ward CLARK.

Patented July 10, 1951 UNITED PATENT oFiF-ics -:t Acme Tank 19:. "Welding (20., .a Division of Uni-ted Tool &"DiB Company, Hartford, 001m.

Application February 19, 1948,"Serial No.9;572

"7 Glaims.

This 'i-nvention relates to baliles for boiler tubes and more-particularly "-to :a device which "is used for retarding the new of l'1eat through a heat exchange tube so as to increase "the efiiciency of the boiler. V

An -o'biect-of the "invention is to provide such a'lbalile which is particularly adapted forboilers having'a plurality of fire tubes ex tending through a water chamber.

-A still further object of the invention is to provide abafile which will retard'th'e flow cf'heat through the iir-etr-i-beand at thesame timedirect a portion of said "flow: into contactwith the walls of the tube so as to increase'the-efiiciency of "the boiler. g

A still '-fu-rther object of the invention is the provision of a baflle which will .retard the flow of heat and which willtherebybecomesuper-heated so "(as to accelerate the transfer of .lreat through said tubes. f.

Further-objects and advantages of the invention will be more clearly understood from the Iollowing description and from the accompanying drawings, in which- Fig. 1 is-an elevationa-l'view ofa portion .of a boiler including a pairof fire tubes.

Fi 2 is aside -view --incentra-l vertical section through said tubes.

As shown in the drawings, the numerals 5-6 denote, respectively, the top and lower plates of a water chamber in a boiler of conventional construction, such as includes a plurality of fire tubes 18 which extend vertically through the water chamber and parallel to each other.

This invention is directed particularly to the provision of a bafiie which will retard the flow of heat through said tubes and direct said flow along the walls of the tubes so as to increase the transfer of heat from said tubes to the water in the water chamber.

My invention provides a baffle in the form of a tube which is preferably constructed of sheet metal of a suitable alloy to withstand high temperatures. The said tube 9 is provided with a cap, or top plate, In in the form of a disk extending and spaced from the top of the tube 9 and having the bottom surface thereof convex so as to direct the heat radially through the space H which is provided between the top edge of the tube 9 and the bottom surface of said disk II).

The said disk may be secured to the tube by means of ears l2 which are bent downwardly from the disk and spot-welded to the tube so as to support the disk in spaced position from the .2 'end ef the tube. The saitl disk is also provided "with radially projecting tabs 13 "which serve to center the balile within the tube and retain it in -positi'on wherein "the -walls of the baille "tube are spaced from the heat transfer tube to allow a heat passage therebetween. The'bottom portion of the tube is provided outwardly extending "tabs M which cooperate with th-e tabs to keep the baillle tube aligned within the fire tube.

'Inorder to support -my improved ha-files within the lire tubes, there is provided a Ill-shaped wire hanger'which 'has' depending side portions l 5- I 5, that are bis-axial :with and securedto the disk l0, and acrossbar 6 "which overlies the ends of a pair "of tire tubesand thereby suspends "a pair of 'baflle tubes therein, as clearly illustrated in Fig. 2.

The said L l-shaped wire "member provides a practical and economical means for supporting the "baffles "withinthe fire "tubes, since the said 'baflles may be simply mounted in pairs on said Ueshapeii member and-dropped in position within the "fire tubes wherein they will be supported by the {U shaped -m'em-ber resting upon the top edges or sa'idfire tubes. iInthe operationofmy improvedba'fllathe heat which "is indicated by :the arrows in Fig. :2, will travelupwardlyfin the tannularspace "between the bafile tube "9 "and'the'firetube ii and also into' the said bafile tube. Upon entering the bafile tube the flow of said heat will be retarded therein by the disk 9 and a restricted flow is permitted through the space H. Retarding the flow of heat in this manner will serve to super-heat the tube 9 so that it will in turn super-heat the heated air flowing between the said bafile tube and the wall of the tube 8 and thereby accelerate the transfer of the heat to the water in the boiler and increase the efliciency of the boiler.

It has been found by actual use that the baflle tubes 9 will increase the efficiency of the boiler, when the heat is retarded within said tubes by the disks I0, since this permits the tubes to act as bailles, which will direct a substantial portion of the heat flow into contact with the inner surfaces of the walls of the tubes 8, and the remaining portions of said heat flow to build up within thebafile tubes 9, due to the restricted flow permitted through the space H, and serve to super-heat the said baflle tubes so as to in turn increase the heat transfer through the fire tubes.

I claim:

1. For a fire tube of a boiler, a baflie including a tubular member smaller than the inside of said fire tube and adapted to be positioned within the said fire tube, and a plate extending across an end of said tubular member and spaced therefrom to retard the flow of heat through said tubular member and thereby increase the heating thereof by said flow and direct a portion of said fiow be tween the tubular member and the inner wall of the fire tube, the said plate beingseparate from the tube andh'aving tabs bent downwardly therefrom and secured to the tube for supporting it, and other tabs extending outwardly from said plate, substantially on the plane thereof, for spacing the baflie from the walls of the fire tube.

2. For a vertically disposedfire tube of a boiler, a baffle comprising a tubular memberof lesser outside diameter than the inside diameter of the fire tube and adapted to be supported within said fire tube co-axially therewith, a disk-shaped member extending across and spaced from the upper end of said tubular member and secured thereto by means of spaced tabs bent downwardly from said disk-shaped member, and radially extending tabs on said disk-shaped member for centering the said tubular member within the fire tube. r

3. For a fire tube of a boiler, a baflie including a vertically disposed tubular member of lesser outside diameter than the inside diameter of the fire tube, a disk-shaped member secured to and extending transversely of said tubular member and spaced from thetop thereof to retard the fiow of heat to said tubular member; the lower surface of said disk-shaped plate being convex to direct the heat fiow towards the space between said plate and the upper edge of the tubular member, tabs radiating from said plate and from the lower portion of said tubular member for centering'the said bafile within the fire tube, and means for supporting the said baffle within the fire tube.

4.- For the fire tube of a boiler, a baffle including a tubularmember of lesser outside diameter than the inside diameter of the fire tube, means for retarding the fiow of heat through said tubular member, and means for supporting said tubular member within the fire tube and longitudinally thereof including an integral inverted U-shaped wire hanger extending secured to said tubular member andadapted to extend into the fire tube over the edge thereof and into an adjacent fire tube for supporting a similar baiile therein.

5. For a boiler including a plurality of vertically extending fire tubes, a heat flow baflie including a plurality of tubular members having means for retarding the flow of heat therethrough and being of a lesser outside diameter than the inside diameter of said fire tubes, and an integral inverted U-shaped supporting member having said tubular members suspended from the ends thereof and'be'ing adapted to extend over the upper ends of two adjacent fire tubes for supporting one of said tubular members longitudinally in each of the fire tubes.

6. For a fire tube of a boiler, a baflie device including an. integral, inverted U-shaped wire hanger, a disk-shaped member secured to the end of each leg of said hanger on a plane perpendicular to the. sides thereof, and a tubular member suspended perpendicularly from each of said disk-shaped members and spaced therefrom; the said hanger being adapted to extend over the top edges of two adjacent fire tubes and, support said bafiie tubes therein andco-axially therewith.

7. For a boiler having a plurality of justapositioned vertically extending fire tubes, a bafiie device including a pair of baffles each comprising a disk-shaped plate, a tube suspended perpendicularly to and spaced from said plate, a plurality of tabs radiating from said disk-shaped plate and tubular member for centering them within the fire tubes, and an integral inverted U-shaped wire hanger connected to said pair of baffles and adapted to extend over the top edges of the two adjacent fire tubes and support one of saidv bafiles in each of said fire tubes.

STANLEY J. CLARK.

7 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Willett Apr. 25, 1939