US1641999A

US1641999A - Heat-transfer device

Info

Publication number: US1641999A
Application number: US42335A
Authority: US
Inventors: Webster Hosea
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1925-07-09
Filing date: 1925-07-09
Publication date: 1927-09-13
Anticipated expiration: 1944-09-13

Description

Sept. 13, 1927. 1,641,999

-H. WEBSTER HEAT TRANSFER DEVICE ATTORNEYS Sept. 13,1927. 1,641,999

lH. WEBSTER HEAT TRANSFER DEVICE' Filed July9, 1925 5 Sheets-Sheet 2 l j 'w a Q M l i g I' i ||l|| l: I i J u l u@ t I KH r, .I

w HH w\ is N l Y L w @nl l\ .l DI] IN i N INVENTOR www ATTORNEYS Se t. 192

p 13 7 H. WEBSTER HEAT TRANSFER DEVICE Filed JulyQ, 1925 5 Sheets-Sheet 5 7(/NVENTOR BY WJ 7 1 ATTORNEYS Patented Sept. 13, 1927.

. Amartin) STATES PATENT oFFlcE. A

11081EA WEBSTER, OEMONTCLAIR, NEW JERSEY, ASSIGNOR TO THE BAECOCK & WILCOX COMPANY, F BAYONNE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

HEAT-TRANSFER DEVICE.

Application led July 9,

My `invention relates to heat transfer dey vices and has particular reference to means for insuring that one of the thermally con'- tacting fluids is distributed over the heat o transfer surfaces with substantial uniformity. In the case of air heaters for steam boilers where, for example, the air to be heated enters and leaves at right-angles to the heating surface, there is a tendency for lo the air to'take the shortest paththrough the heater and thus to avoid contact with a considerable part ofthe heating surface.

My invention will best be understood by reference to the following detailed descrip-I Ir tion and lto the annexed drawin s of air heaters for steam boilers and the li e, which I have chosen as illustrative embodiments of the invention. Fig. 1 of the drawings is a view in vertical section of said embod1ment'; Fig. 2 is a view of a section taken aiong line II-II of Fig. 1; Fig. 3 is a view also in vertical section, showin@ a modification; Fig. 4 isa similar view s owing a second modification, partl broken away; Figs. 5 and 6 areviews o ysections taken similarly to Fig. 2 yand show modifications of the arrangement of the tubes and. construction of the baffles.

Referring to Fi 1, 10 denotes the casing of an air

heater having headers

11, 11 in whi'ch are held conduits or tubes 12. Furnace gases from the boiler pass through the damper-controlled duet 13, and through the tubes or conduits 12 to the stack. The air to be heated enters the heater through inlet openings 14 and leaves by exit opening 15, both said openings being disposed sidewise of casing 1Q. l

For insuring a more uniform distribution of air over the tubes 12, I mayprovide one or more baies 16 opposite inlet opening 14.

Baies 16 arespaced across the heater andv extend graduated distances into the region opposite the inlet opening; that'is, with the bale furthest from inlet 14 extending furthest across the rojection of such openin on the plane t, ereof and each of the oter bales a. successivel less distance. This, in effect, produces si e openings in a series-of parallel ducts extending longitudinally of the tubes. Preferably similar baliles 17 are similarly disposed with reference to exit o nin 15.

In the mo `ificatlon shown in Fig. 3, another set of bames- 16, is placed near the 1925. Serial No. 42,335.

mouth of the inlet opening 14 at an angle to the baiiies 16 so as to provide a series of ducts leading into proximity7 with the/ducts formed by the baffles 16. These bales 163 extend across the tubes 12 to different distances as indicated in the drawing so as to minimize the tendency for an excessively large proportion of the air tov follow the shortest path and consequently fail to come into eective contact with all of the heat exchanging surfaces of the tubes. A similar set of cross baies may be installed ,atlthe other end of the tubes 12 as shown at 173 in proper relation to the baies 17, if desired. y

In the modification shown in Fig. 4, the transverse bafiles 164 are made as prolongations of the baies 16, which lie along the tubes, being joined thereto along curved lines and extendin across the tubes 12 in proximity to the in et opening 14.

In Figs. 2, 5 and 6, I have shown different methods' of disposing the battles between tubes 12. In Fig. 2, the bales 16 are given a sinuous or corrugated shape in order to accommodate them to the tube spacin In this construction, as it is applied to t e arrangement shown in Fig. 1, the battles are preferably inserted while the tubes are beiner secured in place duringthe construction o? the heater. If it should become necessary to remove the baiiies, the tube rows adjacent the baile to be removed are first cut out whereupon the bale 16 may be removed sidewise of the heater. While this arrangement is not so convenient for the removal. of the baiiies, it is advantageous because 'it permits a close spacing of the tubes in a staggered relation.

In Fig. 5 I have shown the use of straight baiiies 16h,` tubes which'would normally 4be positioned in the plane of such baliles being removed. In this construction the bales 16b are removable without the necessity of cut-4 ting out any of the tubes. In Fig. 6 I have shown the baiiles as made up in sections 16 100 of a width equal the distance between adjacent tubes in line with the batlie, each of which sections may be passed through the diagonal lanes between the tubes 12. By means of this construction the tube spacing 105 is not disturbed while the bailes may be removed witho'ut necessitating the removal of any of lthe tubes. If desired, the bailies secJ tions 16" may be made of a width equal to a small multiple of the distance between ad- 110 jacent tubes in the plane of the baille, so long as they are capable ot being inserted betvveen the diagonal lanes through the tubes.

It will be seen that by reason of this baille arranement the air or other fluid contacting with the heat-exchanging surfaces is substantially uniformly distributed over such surfaces by being divided into a plurality of streams which are caused to come into effective heat exchanging relationship with the heat exchanging surfaces as the streams are guided in approximately parallel pat-hs to the tubes or other form of heat-exchanging surface throughout practically their entire lengths. In the preferred embodiment I have shown the bullies 16 parallel to the heatexchanging surfacesbut itis obvious that the bales may be inclined toward the entrance or exit openings.

I claim zW 1. In a heat transfer device. a casing, longitudinally extending conduits therein, means for passing a first fluid through said conduits, said casing having longitudinally separated openings in the side thereotfor admission and Withdrawal, respectivel of a. second fluid externally' of' said con uits, transversely spaced, detlecting bafHes entending graduated distances into the region oposite at least one of said openines so as to Ilivide said second fluid into a plurality of streams and guide said streams in approxi mately parallel pat-hs to the conduits.

2. In a heat transfer device, a casing, longitudinally extending tubes therein, means for passing a rst fluid therethrough, said casing having longitudinally separa-ted openings in the side thereof for admission and withdrawal, respectively, of a second fluid externally of said tubes, parallel, transversely spaced battles, each disposed between adjacent tube rows, said balles extending graduated distances into the region opposite at least one of said openings so as to divide said second fluid into a plurality of streams and guide said streams in approximately parallel paths to the tubes.

3. In a heat transfer device, a casing, lon- ,oitudinally extendin tubes therein, means for passing a. first uid therethrough, said casing having longitudinally separated openings in the side thereof for admission and Withdrawal, respectively, of a second fluid externally of said tubes, parallel transversely spaced battles, each composed of sections ot' widthsequal at least to the distance between adjacent tubes in the line of the battle, said bafiles extending graduated dis- Learner;

tances int-o the region opposite at least one of said openings so as to divide said second duid into a plurality of streams and guide said streams in approximately parallel paths to the tubes.

l. In a heat transfer device, a casing, longitudinally extending conduits therein, means for. passing a first fluid through said conduits, said casing havinO' longitudinally separated openings 1n the sides thereof for admission and Withdrawal, respectively, of a second fluid externally of said conduits, and a baille extending into the region opposite at least one of said openings so as to divide said second fluid into a plurality of streams and guide said streams in approximately parallel paths to the conduits.

5. In a heat transfer device, a casing, longitudinally extending conduits therein, means for passing a Erst iluid through said conduits, said casing havinor longitudinally separated openings in the sides thereof for admission and Withdrawal, respectively, of a second fluid externally of said conduits, a baille extending into the region opposite at least one oi said openin s so as to divide said second fluid into a p urality of streams and guide said streams in approximately parallel paths to the conduits, and a transverse baffle leading from said opening approximately toV said first named baffle.

6.111 a` heat transiter device, a casing, longitudinally extending conduits therein, means for passing a first fluid through said conduits, said casing having longitudinally separated openings in the sides thereof for admission and Withdrawal, respectively, of a second fluid externally of said conduits, and meansextending into the region opposite at least one of said openings so as to divide said second fluid into a plurality of streams and guide said streams in paths approximately parallel to the conduits.

7. In a heat transfer device, a casing, longitudinally extending conduits therein, means for passing a first fluid through said conduits, said casing having longitudinally separated openings 1n the sides thereof for admission and Withdrawal, respectively, of a second fluid externally of said conduits, and means extendinrv into the region opposite at least one of said openinfrs so as to divide said second fluid into a plurality of streams and guide said stream in paths approximately parallel to the conduits, said means comprising a plurality of bullies.

HOSEA WEBSTER.

CERTIFICATE or coluxEtzTloN.

Patent No. 1,641,999. ,y .Granted sepiembnis, 1927, to,

' HosEA WEBSTER.

1t is hereby certified that error `appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, lines 25, 38,

and 52, claims 1,I 2, and 3, for the word "side" read "sides"; same page, line 112, claim 7, for "stream" read "streams"; and that the said Lettere Patent should be read with these correction's therein that the same may conform to the recordof the case in the Patent Office.

Signed and sealed this 11th day of October, A. D. 1927.

M. J.y Moore, I Seal. Actingomminioner of Patents.