US1400853A - Superheater - Google Patents

Description

J. A.v BARNES.

SUFERHEATER.

APPLICATION FILED Nov. I. IQII.

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I. A. BARNES.

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APPLICATION FILED NOV. 7. 19|?.

. Patented m2o, 1921.

3 SHEETS-SHEEI' 2.

1. A. BARNES.

SUPERHEATER.

APPUCATION FILED NOV. 7| 1917. 194Q853., Patented Dec.. 20, 1921.

3 SHEETS-SHEET 3.

JOHN A. BARNES, 0F 'WEST NEVI BRG'ETUN, NJEN YORK, ASSEGNDR TO THEV SUPER-V reins..

HEATER COMPANY, Gl' NEW] YRK, N. Y., A CORPORATION 0F DELAWARE.

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Specification of Letters Patent. Pgybggntgd D99, 2Q, 19,21.

Application filed. November 7, i917. Serial No. 200,691;

To all 'whom t may cou-cem:

Be it known that l, JOHN A. BARNES, a citizen of the United States, residing at West New Brighton, county of Richmond, State of' New York, have invented certain new and useful improvements in Sugerheaters, of which the following is a specification.

My invention relates to superheaters of the type commonly referred to as fire tube superheaters, and has for its purpose the production of a superheater of this type, wherein a future addition of superheating surface may be readily made without necessitating any material alteration or any discarding of the parts installed in the first place.

The invention will be readily understood from the following* description, which is to be read in connectionwith the accompanying drawings forming part hereof. ln those dra-wings, Figure. l. shows a. view off a section on line ll of Fig; 2, and Fig. ,2 a sectional view taken on line lil-ll ot Fig'. l of a superheater as first installed. accordinp,- to my invention; Fig. 3 shows a sectional view on line lll-lll of Fig. el., and Fig'. et, a sectional View on line lV-lV of Fis'. 3, illustrating the addition, of more units; 5 to 8, are similar views of a modification, the section being taken respectively on lines V-Jf, Vl-Vl, vll-VH, andy Vilflfw VIH; 'Fig 9 shows a side view and Fig. l0 a bottom elevation of the header; Figs. l1 and l2 show similar views of a modified header.

Taking; up now a detailed description ot the invention, and referring first to Figs. l and 2, we have here illustrated an ordinary toi-m of fire tube superheater as applied to a Scotch marine boiler. The 'flues l have extending into them the loops 2 ot the superheater units 2, there beine' two loops to eachv unit, extending' into neighbon ing dues. Une eind of each unit is attached to and communicates with the chamber 3 et the header 4, and the other end with, chain ber 5. Fig'. 2 illustrates four rows of tlues occupied by superheater loops. lt will be understood that substantially all ot the dues in the first four vertical tiers, counting` trom 'the header outward, are supplied with such loops. The flues beyond the fourth (not shown) have no loops in them. The figure shows only those superheater units on the left Side of the header. It will be understood that there are units, symmetrical with those shown, on the right side, connected to .the right side of the header at the openings 6.

t Referring for a moment to Fig. 9, which 1s a side. view from the right of a complete header, it will be seen that the tops of the chambers 3 and 5, are provided with flanges 7 and 7 respectively. These flanges are for the purpose of attaching steam pipes to the two chambers, the one supplying the wet steam from the boiler being attached to chamber 3 and the other, conveying the superheated steam to the engine, to chamber 5. The two chambers are usually made separate and secured to each other by means of the straps 8, screwed to their sides by ieans of cap screws 9. i

The action of the superheater may be described as follows. Steam, entering chamber 3 from the boiler, leaves this chamber and circulates through the units 2, being delivered by them to chamber 5, whence it is carried to the engine. lWhile circulating through the units 2 it becomes superheated by the hot gases which are flowing' through the flues on their way from the fireboX to the Stack.

It happens occasionally that for certain reasons it may be undesirable at the time a superheater is installed to make it ot the size really possible and generally advisable as far as the size of' the boiler and number of its dues are concerned. lWith such an undersized superheater the superheat given the steam for a given rate Vof steam consumption will be less than is required for best economy( l/Vhen later on conditions are altered and a higher degree of superheat is wanted, the only practicable thing' with appliances as hitherto known i5 to remove the old superheater and install an entirely new one, having either more units or units with more loops each. The present invention makes it possible to install the additional superheating; surface without making?Y it necessary to discard any of the old material, or even to alter it. In other words, the old superheater units may be used in substantially the shape they are, all that is necessary being to connect them up diiferently and then to put in the additional units.

To make this possible there is provided,

as an integral part of chamber 3, a blind passage l0, which is closed at top and bottom, as evident from Fig. 9. A plug 11 at the bottom closes the opening providedto remove vthel corel used in casting. In the superheater as originally installed this passage 10 is not utilized. To increase the superheater to the desired Size, as shown in Figs. 3' and 4, the ends of the units 2 are detached from chambers 3 and' 5` and connected anew as shown in Fig. 3. Those ends which were "connected to chamber 3 are now connected to blind passage l0, while the remainding ends of one 'set of units now connect with' chamber 3, and the other with chamber 5. This leaves one tier of openings in chamber 3 free and also one tier in chamber 5; and to these openings are now connected the new units l2. The new units l2 are seen to comprise four loops each, and these loops occupy the next tour tiers of lines adjacent to the four occupied by the" oldV units. Y

4Tracing the course the steam will taire 1n the enlarged superheater, it will be seen that it passes Jr'om chamber 3 to chamber 5 by two parallel paths. Theone takes it throughthe original units 2,*one set'carrying'the'steain from chamber 3 to chamber 10, the other carrying it from chamber 10 to chamber 5. The other ofthe two parallel paths is through the new units l2. It will be noted lthat each Aof these two parallel paths comprises four loops, and that moreover the steam section, z'. e., the total free larea for the iiow of steam, has remained what it was before the'new units l2were added. Both oi these features are highly desirable from practical considerations.

It will be understood that while l have 'described the installation of' the additional units on the one side of the header only, a a

corresponding installation nmade on the other side, so that the total superheating surface becomes double what it was in the 'first place. Obviously the degree of superi"2 each comprise threejloops, while the new units 12 comprise six. lith this exception the two forms are alike, and m-utatsff/mmndz's, the description given with reference to Figs. l to 4l' applies equally well to Figs. 5to 8. It willbe evident that other modifications may be made. TheV header may, e. g., be located to` one side or above or below the iiues, in which case there are superheater units attached to only one side of the header; or the header might be placed at some other than a right angle tothe'flue` sheet; or the units might be altered to conform to a staggerediue arrangement; or the loops of the units in the form illustrated might lie vertically instead of horizontally; but these and similar variations are obvious and are yconsidered to be within the spirit of the ap-vk pended claims. l

Figs. ll'and l2 illustrate a variation that may be made in the header. Instead of having the chamber l() cast integral with chamber 8, it may be made as a separate casting;V

in which case it need not be supplied until the enlargement oi the superheater is undertaien. v t is then secured to the other two chambers by meansof the straps 8 as shown.

While the forms of the header shown are those preferred by me, some variations may Y the combination of a header provided with three chambers, a set of superheater elements connecting the lirstfand second chambers, a second set of elements connecting the first and third chambers, and a third set of elements connecting the thirdv and second chambers. y

2. VA superheater comprising a single three-chambered header, each chamber provided with the same number of openings for the attachment of superheater units, ,two of the chambers being provided with connectively.

tions for steam supply and delivery respec i 3. A superheater comprising a single'v header having three chambers each provided with the same number of openings for the attachment of superheater units, two of" them provided with connections for steam supply and delivery respectively, and units vcornmunicating with a vplurality of saidA chambers through the openings'.

l. ln a superheater oit' the classdes'cribed,

the combination of a Aheader provided with three chambers, a set of superheaterf elements connecting the iirst yand second chambers, a second set oic elements connection'the first and third chambers, and a third set ofelements connecting the third and second chambers, the number of elements in the three4 sets being substantially the same.

5. ln a superheater of the class described, the combination of a header provided with three chambers, a set of superheater eleilo ments connecting the first and second cham- Y bers, a second set of elements connecting the lirst and third chambers, and a third set" of elements connecting the third and second chambers, the total superheating surface of f the set connecting the Vfirst and third cham! bers being substantially equal to the sum of the superheating surfaces of the other two sets.

6. In a superheater of the class described, the combination of a Aheader provided with;

here a second set of elements connecting being substantially equal to the sum of the the iirst and third chambers, and a third supeiheating surfaces of the other two sets. 'set oit' eiemeiits connecting the third and secend chambers, the number of elements in JOHN A' BARNES' the three sets being substantially the same, 'Vitnesses: the totali superheating surface of the set G. E. KERSHAW, connecting the first and third chambers A .(1. LOUDON.

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