US1660926A

US1660926A - Steam superheater

Info

Publication number: US1660926A
Authority: US
Inventors: Kemnal James; Henry John
Original assignee: Babcock and Wilcox Co
Current assignee: Babcock and Wilcox Co
Priority date: 1918-05-22
Filing date: 1919-02-04
Publication date: 1928-02-28
Anticipated expiration: 1945-02-28

Description

Fb. 2s, 192s.

J. KEMNAL ET Al.

STEAM SUPERHEATER original Filed Feb. 4. 1919 3 Sheets-Sheet 1 ATTORNEYS.

Feb. 2s, 192s.

6 R. Mw... 2 w E ,9 2 fm N /T N 6, w n M 6 e 11i T 6, Ooowooooo x T l w oooooooooooooooco 7 li. e o o o o O o o o o O W h e o o o o o o o o o n o o o O o o o o o O s 0000000 OOOOOOOOO y s o oooooooo Y B O o o O o o O Y ooooo@ L l L M m 4. L R F M M w m .n K m m uw .un .n o

Feb. 2s, 192s. l u

J. KEMNAL ET AL STEAM SUPERHEATER original Filed Feb.4, 1919 3 Sheets-Sheet 3 /l//l//l/l. Phill/11,111,111

INV NToR.

AMMAP Milli/ 11111 I Anothenobjectis 'to provide-a construc-V Patented Feb. 28., 1928.

PATENTd oFF1cE-..

JAMEsxEMN-Anor CHISLEHUBSTTANIJ'JOHN HENRY, .oF-"NoRBURYg LoNDoNl imm LAND, ASSIGNOR A'IO BABGOCK 68s WILCGX SE1",V A'CORPORATIONZOFNEW JERSEYZ i STEAM SUPERHEATEB/i Applcationled February 4, 1919, SerialNoi`274,840, and in Great `Britain 'May 22,' `19f18`.` Renewed october s,- 1924.J y y i @un invention relates to improvements` in steam super-heaters; applicable more par`` ticularly toboilers of the locomotive type, though' also4 applicable to boilers ofd the marine orother ty es.`

OnehobjectA of t einventionis to insure readyaccessibilityo-all parts;includingre tubesandsuperheater` tubes, for cleaning orrepair. Y

tion of-"superheater which is easy to control, is simple-t0 manufacture,f presents arminimum numberl of joints to be kept tight; and` blytwhich the degreeA oi superheat can be regulated.L

Yet another Objectis to provide a construe'- tionlof superlieater :includingVV receivers dis-` posed horizontally in the smoke box transversely ofthe-"length ol` the main inlet? and outletboxes by means offwhieh receiverstlre heating f surface 6 capacity can beI increased withoutinterference With'the main `inlet and outlet boxes; said f receivers being connectible to `tl1e -'boxes-an'd 5to' 'thesuperheater tulies in suclr- WiseHl as to Vpermit convenient removal of one or` 1no1e-sections ofl the super-heater s without-interfrenceWitlithe mainrbones o1.

with other superheater sections; the several sections `bein adapted forl convenientA han dlin'g enfors 'ipment as self-'contained units.`

Still anotherobject is to provider;'con` struction in whichi theunainh inlet box-Risl always'openfto-saturated steam; the steam izethe pressure on 4the valve 'and to permit the**passage*ofdaflimited J volume of steam toV tlieen 'nef cylinders for' Warming@ pursA poses-gdr example-,wwhen the` engine star'rding;k Y y 6 Othfer objects" and f advantages will appear fonrthe-following description.-

In the` accompanyingdrawings, Fig; 1l is a longitudinal "section of'a steam superheater and associated parts,` `showing the regulator" in openpositiom' Fig. 2"'is a viewsimila'r to" Fig. 1 showing theregulator in" closed ositiong Fig: 3 is' anend vienI of' Figglf; dg. @isa sectional view, simila1tol`ig:l,` showinga modified arrangement; in which ja larger number of-lsuperlieaterA tubes are 'disposed Within each ofsevera'l large fire tubes Fig. 5 is an end vView ofFig: 4&1; 6 is a longitudinal section;` sliowing a'v modified y form of lnyinvention,` in vvlriclia1 valve of known form is located in the steam doyme; Fig. 7 1s anenlargedvlewrsimilar'to"Figi l,

and-Fig. 8"-is a fragmentary* section `similar' to Fig. `7 butshowing thefparts linpo'sition to` admit5v saturated steaml to the engine' cylinders. y

Similar reference characters denote similar part-s 1in therseveral viewss" Referring,` yfirst to lthe' construction `sliovvrr in Figs. .1 t`o 3, Adenotes the main .saturated steaminletbox, and B the mainsu erheated steam "outlet box, bothlioxes "Al arr `B bein disposed crossvvisey inthe smole The mam inletfhox Aris-connected" u to" the` boilerbyL meansfofisliortltubes"(l," t e latter being,r expanded inthe header A and the boilerl tube"` plate,- and connectedl on `the boilerf'side to one* `or more dry pipe'sgpre`A erably fitted in 1 the steamA dome;` or located near the *highest portion` 1 of ythe boiler `vvli'ere there `isino steam :dome-.p Nolvalvesf are con' nected l with fthe* dry fp'pes; so that steam is continuouslyadmittd i`1'rt`o2tlieibox A. Expanded in lthe boxes A and 1B l arenip-- ples xD, also expanded into tlieupperihalves of` doubleseupped receivers E, orL `receiver-'f6 having separateccom ,art'mentsg which` ein tendhorizontally in 4t efsirrolr'e boxinlaA dil` rectionf "transverse *tothe *length of J the boxes A an'elfB.' Inspractice, thefupperland lovver halves 1 ofi said receivers l E are preferably each stamped or foutlin one piece.

The superheater-tubes E are expended into the lower 1 halves 'l of? the` double-cupped rei` ceivers Ef'each tuble beingled `ffom loneconn pertinent of` the re' Jeetvef kreceiver E into andl throughv oneoflt lire tubes ofthe boiler," and thence; back tethfe other com-pertinent of the receiverl" l THe-*l receivers are `divclecl along a plane substantially parallelttorlthe headers and -secured together by suitable flanges.

G denotes the superheated steam regulator, which serves the entire installation and which is fitted on the 'top of the main outlet box B and connected to the boiler tube plate.

Movable within the casing of the regulator is the piston valve H fitted to the hollow valve spindle II, and controllable by operation ot the lever H2.

. I( denotes pipes connecting the regulator to the engine cylinders.

In Fig. l the regulator' is shown open, permitting the passage of superheated steam from the main outlet box B, by way of the regulator G and the pipes K, to the engine cylinders. In Fig. 2 the valveI'I is shown in position to close the regulator, so that the superheated steam is sluit ott i'rom the engine cylinders, but is tree to circulate back into the boiler without being throttled.

As shown, the tubular i spindle II is formed adjacent to the valve I'I with a slot or port I controllable by ajustment oiE the internal spindle J, iitted with the hand-wheel L They slot or port I permits passage of saturated steam into and through the interior of the valve spindle II to mix with the superheated steam and thus to regulate the degree of superheat.

In the end of the internal spindle .I is a narrow passage J which may be brought into register with the slot or port I, so that, for example, when the engine is standing, a limited volume oi steam may be admitted by way ot the said passage to the back et' the valve I-I, so as to equalize the pressure thereon, and whence such volume of steam may be led to the engine cylinders for warming the latter.

When saturated steam is to be led to Jthe cylinders for warming purposes and super-` heated steamvexcluded therefrom, the pistou valve H is moved slightly to the right of the position indicated in Fig. 2 so as slightly to uncover the port leading to the cylinders, and at the same time prevent the free flow or' superheated steam to the back of the piston valve, as illustrated in Fig. 8. It will be apparent with the Jform ot valve-operating meansdisclosed that the tubular stem I-I, together with its valve H, is susceptible of rotation on its axis, whereby the elongated portion of the valve may be moved from the position shown in Fig. 2 through an arc oit 1800 or less, thus completely closing the out p let from the box B and opening up a free communication between the steam space of the boiler and the engine cylinder.

The parts above described are preferably all ot wrought and solid drawn steel.

As will be evident, the arrangement above described answers entirely the objects of the invention as above set forth.

In the modiiication oit our invention shown in Figs. i and 5, the arrangement oi the regulator' is the saine as shown in Figs. loto 3, but a larger number of superheater tubes are arranged within yeach ot `several large fire tubes than shown vin Figs. 1` to Y In the modiiication shown inFig. G, a

alve Gr is within the steam dome, the steam entry being controlled onthe inlet side of the super-heater.

In the modiiied forms shown in Figs. 4 and 5, and in Fig. G, the superheater tubes F are expanded into the lower halves ot doubleeupped receivers E, wliielrare nippled to the main inlet box A and main outlet box What we claim and desire to secure by Letters Patent oil the United States is zl. A steam superheater comprising, in combination, main inlet and outlet boxes,

a regulator comprising a cylinder' litted to.

the outlet box and a slide-valve, and a tubular valve-spindle connected to and` passing through said valve and exposed to saturated.

steam, said spindie being pin-vided with a port through said exposed portion communieating with the interior of said spindle, ,vhereby saturated steam may pass directly to the rear of said valve.

2. A steam superheater comprising, in combination, main inlet and outlet boxes, a regulator comprising a cylinderiitted to the outlet box and a slide-valve, a tubular valvespindle connected to and passing through said valveand exposed to saturated steam, said spindle being provided witha port through said exposed portion communicating with the interior et said spindle, where by saturated steam may pass directly to the rear of said valve, and means'i'or controlling said port.

3. A steam superheater comprising, in combination, main inlet and outlet boxes, a regulator comprising a cylinder itted to the outlet box and a slide-valve, a tubular valvespindle connected to and passing through said valve and exposed to saturated steam, said spindle being provided with a port through said exposed portion torthe passage` of saturated steam to the interior thereof, and a second spindle arranged within the first and having a slot adapted tobe brought into registry with said port.

4i. A steam superheater comprising main inlet and outlet boxes, superheaterrtubes-con? nected to said boxes, a regulator 'tor con-V trolling the ilow oi' superheated steam onl the outlet side of lthe superheaterl to the engine cylinders, said regulator comprising a cylinder and its piston, the piston being exposed on one side to saturated steam, means i-'or introducing saturated steam to t-he other side oi said piston, the parts being constructed and arranged to admit a mixture of superheated and saturated steam to the engine cylinders in one position of-Ythe piston and in another position of the piston i `by-side main inlet and outlet headers, a

receiver extending transversely of said headiers and havingl compartments communicat ing with the respective headers, said receiver being divided alone a plane` substantially parallel to ysaid headers into two sections removably secured together, and superheater tubes connected to the respective compartments of said receiver on the side remote from said headers, whereby the superheater tubes and the sections of the compartments to which they are connected may be moved as a unit laterally with respect to the headers. 6. A steam superheater for a steam boiler of the locomotive type and having fire tubes comprising side-by-side main inlet and outlet headers, a receiver extending t `ansversely of saidheadcrs and having compartments communicating with the respective headers, said receiver being divided along a plane substantially parallel to said headers into two sections removably secured together,` and superheater tubes located in part in the lire tubes of the locomotive and having the ends thereof outside bent away irom the axes of said tubes and connected'at their ends to the respective compartments of said receiver.

7. A steam superheater for a Steam boiler of the locomotive type having fire tubes comprising side-by-side main inlet and outlet headers, a receiver extending transversely of said headers and having compartments,

, the compartments of said receivers being connected to the respective headers by nipples, said receiver `beiniT divided along a plane substantially parallel to said headers into two sections removably secured together, and superheater tubes located in part in the lire tubes ot' the locomotive and having the ends thereof outside bent away from the axes ot said ire tubes and connected at their ends to the respective compartments of said receiver.

8. A steam superheater for a steam boiler of the locomotive type having fire tubes comprising side-by-side main inlet and outlet headers, a receiver arranged horizontally in the smoke box transversely of said headers and having compartments communicating with the respective headers, said receiver ybeing divided along a plane substantially parallel to said headers 1n two sections removably secured together, and superheater tubes bent away from the axes of said fire tubes and connected at their ends to the respective compartments of said receiver.

In testimony whereof, we have hereunto signed our names.

` JAMES KEMNAL.

y JOHN HENRY.