US2013309A - Economizer - Google Patents

Description

p 1935- G. Pl JACKSON 2,013,309

ECONOMIZER Filed April 19, 1934 2 Sheets-Sheet l INVENTOR 'iumr zo sra'rsis of the tubes available ized, is illustrated in preferred form companying drawings, wherein- Patented Sept. 3, 1935 p rear wOFFIC E I ECONOMIZER George P. Jackson, Flushing-N. "5L, assignor to Combustion Engineering Company, 1110., New

York, N. Y., a corporation of Delaware Application April 19, 1934;, Serial No. 721,293

13 Claims (Cl. 257-240) This invention relates to economizers and has for its primary object the provision of efficient economizers of extremely simple and compact construction in which expansiondifliculties are -overcome.

More specifically, it is an object of my invention to provide an economizer employing head- 7 ers into which the economizer tubes are connected in which the headers are arranged in a manner to simplify the construction of the economizer .and to overcome expansion difliculties.

' I propose to arrange the headers so that they will constitute a leakproof wall of the heating medium passage and thus eliminate the necessity of a tube sheet and make the entire length for heat transfer while at the same time making adequate provision for variations in expansion and contraction during operation of the economizer. Another object resides'in the provision of an economizer of the character described in which the economizer tubes and headers are supported from the casing in a novel manner.

A-further object resides in increasing the heating surface of an economizer of the above character through the employment "of fins on the economizer tubes.

How the foregoing together with such other objects and advantages as may hereinafter appear, or are incident to my invention, are realin the ac- Fig'. 1 is a front View, partly in section, of an economizer constructed in accordance with my invention.

r Fig. 2 is an end viewo'f the 'economizer, the left hand half being in elevation, and the right hand half being insection on the line 2-2 of Fig. 1. Fig. 3 is a fragmentary plan section taken on theline' 33 of Fig. i

' My improved economizer comprises in general,

a casingA, of sheet metal construction suitably insulated as indicated at 4,'and a plurality of economizer tubes located within the casing.

. The casing A is'provided with an inlet and outlet fora heating medium such .as flue'gas, the

inlet 5 being" preferably'located atthe top, and

the outlet 6 at the bottom of the casing. The end 1- ofthe casing is provided with insulated doors 8 giving access to the interior of the economiz'er. i

The economizer tubes'B are of U-bent form and the open or free ends thereof are connected '"into'a plurality of headers located at the end portion i 1 of the casing.

in sliding contact.

The headers 9 are preferably ofsquare cross section and are arranged in superposed relation with a slight space is between adjacent headers,

which is filled with flexible packing material as indicated at l I. The economizer tubes extend crosswiseof the casing and are arranged in rows with the lower legs thereof connecting into the upper portion of the inner walls of the headers, and theupper' heating medium over the tubes is from top. to

bottom. Provision for a drain connection .is

made at M and for a relief valve at I 5.

The headers 9 are supported insuperposed slightly vertically spaced relation by support I.

from the casing A, comprising, in this instance, a plurality of vertically spaced supporting members 16 carried by the casing, and co-operating members I! carried by the headers 9. The spacing of the members l6 is such that -;each header is individually or independently supported from the casing inslightly vertically spaced relation, and the supporting members I 6 and co-operating members I l are of such construction that the headers are free to move or slide in the direction of the length of the tubes B. In the drawings, I have'illus'trated a very simple form of support in which the supporting members l6 carried by the casing are of angle form, as are also thecooperating members I! carried by t eheaders,

the extending flanges of the members I! being By thus individually or independently, supporting the headers with freedom to move or slide, 1 provision is made fortaliing care of variationin expansion and contraction between the difierent elements of the economizer. For example, it will be seen that since each U-tube is connected into a pair of headers, the headers will move with respect to each other as expansion and contraction of the tube occur. In this connection it is to be notedthat the fluid traversing the lower leg of each U-tubewlllbe colder than the fluid traversing the upper leg, so that there'is a difierential expansion and contractionbetween the legs of the tubes. Since the headers are spaced slightly apart vertically, there will be no friction between adjacent surfaces of the headers tending to prevent such movement. With referenceto the flexible packing l l which fills the spaces between headers, this will yield as relative movement of the headers takes place, but at the same time, provides a seal preventing leakage of heating medium past the headers.

In order to "further insure against leakage past the headers, I have provided vertical seals it? at the end portions of the headers, as will be seen from inspection of Figs. 1 and 3, in this instance comprising vertically extending angle members secured to the portions 2E3v of the casing and I spaced slightly from the outer wall of the headem, with flexible or yieldable packing material 2| filling the space. I r

Referring to Fig. 3, it will be seen that the end portion 1 of the casing is somewhat wider than the remaining portion thereof in order to accom- ,modate the end portions. ofthe headers 9 and the ;.supporting means therefor.

The-economizer tubes B are supported from the casing at their looped ends by; means of a .pl urality ,of vertically spaced supporting memibers 'izffsupported from the casing by means. of

/v'erltically extending members 24; The members 2 iare provide'd with spaced slots 25 for the ception of jtabs '25 secured to the tubes as by means of welding. ..-Thus a supporting arrange- I lime'ntis provided which enables free movement Ref theitube's,relative-.to each other.

I Itwill be .seen from the foregoing, that Ihave provided a very simple andcompact economizer in which-tube. sheets such as commonly employed in tubeec onomizers are eliminated because of the novel arrangement of the tubes and .headers whereby the ;headers;constitute a sealed end wall lio rthe heating medium passage. Furthermore,

arranging" the headers in close superposed relation,,the economizertubes are kept in relatively close spacing yertically of'the economizer -.so,that.the;-vertical space is effectively used,:and since,,no tubejsheetsiare.necessary, the entire Qlen'g'th .of the tubes wis ,madelavailable for heat transfer;

}an-economizer constructed in accordance-with my invention because considerable heating surilfac e .is thereby added without the increase in weight which would .result'if 'a' greater number'of tubes andheaderswere added in order toobtain the additional heating surface, it being pointed tout-in this connectionthat in ,order toproperly "support such added :Weight, it would-be necessary to make the casing of heavier construction 41, claim:

. In an econ omizer, a, pluralityof headers,

'eoonomizer tubes connected into, said headers, meansmovably supporting the headers in super- .fposed close proximity, whereby they may move relatively to each other without friction therebetween, and sealing means'between superposed headers;

2. In .an economizer, a plurality of headers,

leconomizer tubes connected into said headers, means movably supporting the. headers in super-' posedfbut slightly vertically spaced relation, and

sealingmeans for the spaces between headers.

Q3. In an economizer, a pluralityof superposed headers, economizer tubes connected into said headers, means movably supporting said headers I as to-further increasethe heating surjface of the .economizer, Iemploy fins 27 on the tub'es B. -Thisis particularly advantageous in spaces-between the headers,

independently of each other in slightly vertically spaced relation, and sealing means for thespaces between headers.

4. An economizer comprising in combination,

acasing having inlet and'outlet for a 'heating medium, economizer tubes within said casing,

horizontally disposed superposed headers into which said tubes are connected; 'means individually supporting each header fromthe casing Withthe headers slightly spaced vertically, and means sealing the spaces between headers.

'5. In an economizer, a plurality of horizontally disposed superposed headers, U-benteconomizer tubes having their open ends connected into "said headers,- means movably supporting said headersfindependently .of each other inslightly spaced relation, sealing means for "the spaces between headers, and means movably supporting saidlU-bent tubes at their loop portion-s.

.6. In an economizer, a plurality of horizontally disposed superposed headers, U-bent economizer tubes havingtheir-openendsconnected into said 1 headers, means movably supporting said headers independently of each other in slightly spaced,

relation, sealing means for the spaces between headers, and, means movably supporting said supporting means oomprising' vertically spaced supporting members carried ,by the casing and tie-operating members carriedby the headers, andsaid tube supporting means comprising ver- U-bent. tubes at theirloop portions saidheader.

tically spaced supporting members carried by'the 7 casing and ,co-operatingmembers carried;.by thetubes. 5

7. An economizer acomprising in combination,

a casing having inlet and 'outlethfor' a heating. medium, a plurality of U-bent, tubes in said casing extending crosswisethereofla plurality of horizontally disposed superposed headers at one wall of said casingintowhichthe free ends of said tubes are connected, means individually supporting each header. from: the casing with v the headers slightly sspaced,:verticallywmeansl supporting said tubes from :the, casing'attheir between the headers. v l

8. An veconomizerv comprising combination,

, a casing .having inlet and outlet fora heating medium, a plurality of U-bent tubes in said casing extending crosswisethereof 'a plurality 0f horizontally disposed headers arrangedin superposed but slightly vertically spaced relation, means individuallysupporting each header-from the casing with freedom to move relative to ;its

9. ,An economizer comprising in combination, a

a casing having inlet and outlet for -a,- heating :medium, a plurality of -U-bent tubes in'saidcas- .ing extending-crosswisethereof, .a plurality ,of

horizontally disposed headers arranged' inisuper posed but slightly vertical ly spacedfirelation,

means individually supporting each yheader from end portions with :freedom to; move Pas; such ex: pansion takes place, and, means sealing ethe .0- An Economizer m-P s gi combination,

la e si a a -iae in e endtolutlet ona heating medium, economizer tubes; a gaging,

:45. bent end portions, and-means sealing the spaces .55 adjacent headers asexpansion.takesplace in a direction lengthwise .of the tubes; and means sealing the .spaces between the headers;

end portions of said headers providing support for the headers from the casing independently of each other, in slightly spaced relation, and

means sealing the space between headers.

11. An economizer comprising in combination, a casing having inlet and outlet for a heating medium, economizer tubes within said casing, 10.

horizontally disposed superposed headers into which said tubes are connected, a plurality of vertically spaced header supporting members carried by the casing, means carried by said headers engaging said supporting members, the spacing of said members being such that the headers are individually supported in close vertically spaced relation, and means for sealing the spaces between headers.

12. An economizer comprising in combination,

a casing having inlet and outlet for a heating medium, a, plurality of U-bent tubes in said casing extending crosswise thereof, a plurality of horizontally disposed superposed headers at one wall of said casing into which the free ends of said tubes are connected, means individually supporting each header from the casing With the headers slightly spaced vertically, means sealing the spaces between the headers and means supporting said tubes from the casing, including slotted supporting members carried. by the casing, and vertical tabs carried by the tubes at their bent portions fitting the slots in said supporting members.

13. An economizer comprising in combination, a, casing having inlet and outlet for a heating medium, a plurality of superposed headers and tubes connected thereinto located Within the casing, means supporting said headers and tubes from the casing, and fins secured to said tubes to increase the heating surface thereof.

GEORGE P. JACKSON.

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