US1839133A - Superheater heated by superheated steam - Google Patents

Description

Dec. 29, 1931. R. UHDE 1,839,133

SUPERHEATER HEATED BY vSUPERHEA'IED -STEAM vFiled oct. 23. 1.929

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In: the.seCond:.1240116t the tlmpeft 'f e p heatingstea-,mgandits ,con 'i ,-1substantiailly.v u nitornu over, t i d ,oi the heating tulesysternsqthatatlex tfas -gregandstheavailablefallfof,tgin `lof 11.10 sonsequenee ,whetherthe Patented Dec. 29, 1931 STATES; QF E ESE;

ROBERT UHDE, or mssEL-wrLnELMsgonE, BESCHNKTER GERMANY, sssIGNoa lro scHMrnTsoHE iaArjTUNG, o1 KASSEL-WIL;-

nnmsnoma; GERMANY, e YW SULERHEATEn Hamlin BY SUBERHEA'IIED STEAM Application led (letobqr 23, 19849, Serial I To.

The invention relates to super-heaters es:

pecially interstage Superhilis, hfl-@i Y superheated steam, vin Whih the heat' steam gives up its superheat in a 'n and its heat of evaporaten, nzliqy part, in .a second Zone.

The construction of such jpg@- sents ditculties in practiqe ,due to tthe :f at thatspecial conditions beafild ith? two zones 'in v0111er that heat from the heating steam gto the steain o .be superheated'may ibefas eitje A t as possible m already superheated to a certain extentip tute fheatt-ortheffsteamtobegsuperh d, t e latterishouldbeheated by hgttqleilldf Q Per .steain-:asiits tempenatnre risesglfrqrnpgin Nto pointfalongiitsfpat),.

This requirement is satisfedif theqssteam da flows, throughout the Tiir st egheatinggsteamtu it cient transmissionbfdheatin tional area, ofI flow .for

heated by help @1fpuede@satrnsed tbati ces yene high temperatureot 4:superlieatlfxr agiven'Vv am tow,

surrounding interstage steam thus 4014330, and il; @www November 3, 1928- perheated throughout the rst Zone in counffefdrrent tothe' heating steam so as toutilize t vailable temperature drop vefficiently and an extended fiiter age ,'lieatfer in whichl the r,space Within Ythe,a aier' A1s.advantageusly utilized vand ,thehe lngj surface` favorably distributed.

il o In'Figurel, thesuperheater container 1s dering at the'bottom bv the inlet,

A2,1W`1 t, ye, superlieated steam leaves at the t mtheioutlet, Heating coils, 4, are

led,y to thel upper ends, 5, otwhich the vsupe "ated heatngsteam is led, the confdensa wilqwing away from the lowerends,.6.

letter' part'otthe'fsuperheater is subdiv'lded ,byverticaly partitions, 7 and` 8, of

beetles `d istanze above 1thebottom, 10, of the convc: l r; 1,,jt'vh`ile the partition, 7, starts from 'thef loottoni,y 1 0, of the container and stops a certain `"distancebelow the transverse Wall, 79. 'ljhiswtraisverse WallneXtends over the greater p Q rt ofthe breadth of the container arranged nat aboutthe level tvhere the heafti'rigp tefain'passing throughthe coils, 4,

. lven yup itsfsuperheat and passed into egsatulztdist'fe- The,chaniberfcorresponding to the irst zone 70;.itli`t/.liperheaterin Ywhich the steani in the 'heating c'oil'sgives up its superheat tothe A K lies above fthejrans'verseWall, ,While below this Wall ponding to the second ,giveslup', itsfheat of evaporatiomivholly or 1 1n part, 'and is correspondingly condensed.

c'li the lpair.titin, r 8,' is connected at its upy d` tq atraiisvers'etvall, 9, and ends a cer so as to 'prolsectioiifa practical construction vof an o ,7o .noted by the nuril'exjal, l, the steam to be super* If the arrangement of the two superheater zones in a common container makes the apparatus too cumbrous and bulky, two separate containers may be provided, one for each Zone.

The steam to be superheated, as shown in Figure 1, flows through the second, i. e., the lower zone of the superheater, with two reversals of direction, its velocity being comparatively high because the cross-sectional areas available for iiow are small in consequence of the sub-division of the container by the partitions.

In the first or upper zone, the pre-superheated steam flows throughout in the opposite direction to the heating steam and there fore the pre-superheated interstage steam definitely increases its temperature of superheat along the whole length of its path through this zone to the outlet.

In the form of the invention shown in Figure 2, the superheater container is formed in two sections, the upper section, 11, forming a chamber serving for the first Zone, in which the heating steam gives up its superheat, and the lower section, 12, forming a chamber for the second zone, in which the heating of the interstage steam is effected by the heat of eva oration of the heating steam.

he inlet connection, 13, for theinterstage steam to be superheated is arranged at the upper end of the section, 12, ofthe container and the outlet connection, 14, for the superheated interstage steam at the upper end of the section, 11, of the container.

In the lower section, 12, a cylindrical partition, l5, is arranged which is provided with feet, 16, resting on the bottom, 17, of the container, openings, 1S, of sufficient size being provided between the feet for the passage of the interstage steam, as shown by the arrows. The cylindrical partition, 15, is carried up as far as the joint between the two container sections, 11 and 12, that is, as far as the plane of separation of the two superheater Zones, and is connected at this level to a horizontal transverse wall, 19, which is formed as a twopart ring formingI a cover to the space between the. cylindrical partition, 15, and the wall of the container section, 12.

The superheated heating steam flows through heating coils, 20 and 21, arranged concentrically in the container, the upper ends of all these coils issuing from' a chamber, 24, provided in the end, 23, of the container, the chamber, 24, being shut off from the interior of the container by a plate, 25, and receiving the superheated heating steam through the inlet 2G.

A corresponding chamber` 28, in communication with the outlet, 29, for the heating steam, is provided in the bottom, 17, of the container, the inner heating coils, 20, which run uniformly through the two Zones of the container being connected to this chamber.

The two outer coils, 21, in the first superheater Zone are interwound in such a way that their convolutions lie on the surface of a common cylinder but after passing into the second zone they are rearranged in the form of two concentric helices lying one within the other and are connected at their lower ends to an outlet, 30, provided in the container wall.

In order to prevent flow of interstage steam through the space within the heating coils, an obturator, 31, is provided taking the form of a closed cylinder of sheet metal.

By means of the cylindrical partition, 15, the interior of the second superheater Zone is sub-divided so that the heating surface arranged in this space is traversed by the steam to be superheated at a comparatively high velocity. The cross-sectional area of that part of the second Zone lying within the partition, 15, is approximately equal to the crosssectional area of the first superheater zone, which the steam to be superheated passes through in counter-current to the heating steam, and as a consequence, on passing from the second into the iirst Zone, no substantial alteration of velocity occurs, especially when it is borne in mind that the volume of the interstage steam increases with increasing superheat.

Due to the fact that the convolutions of the two outer coils, 21, in the first zone are wound into one another and in the outer section of the second Zone lie one within the other, a uniform distribution and compact arrangement of heating surface are securedd What I claim is:

1. A superheater heated by superheated steam comprising a container divided into two chambers, tubular heating coils for su perheated heating steam passing through said chambers, the first of the chambers being adjacent the inlet side of said heating coils and the second of said chambers being adjacent the outlet side of said heating coils,- said second chamber having an inlet opening for the steam to be superheated and said first chamber having an outlet opening for the steam to be superheated at the side adjacent the inlet of said heating coils, said second chamber communicating with said first cham-f ber at the side adjacent the intermediate portion of said heating coils, and partitions dividing said second chamber into a plurality of connected sections, said partitions being so arranged as to provide a tortuous path of reduced cross section for the steam to be superheated through said second section, whereby the steam to be superheated passes through said second section at a high velocity in heat exchange relation to the heating steam in the second part of its path and then through the iirst section in heat exchange and counter current relation to the heating steam in the first part of its path, said heaing steam giving up its superheat in the first .part of its path and its heat of evaporation in the second part of its path. l

2. A superheater as claimed in claim 1 wherein the partitions are arranged to divide the second chamber into two sections, one of which is in direct connection with the first said chamber, some of the heating coils running uniformly through the rst chamber and that section of the second chamber directly connecting with the irst chamber, and other of the heating coils having inter- Wound convoiutions lying one above the other in the iirst chamber and convolutions concentrically arranged but of different radius in that section of the second chamber Which is separated by the partitions from the section directly connecting with the first Y chamber. y In testimony whereof I have affixed my signature.

ROBERT Uli-IDE.l

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