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Патент USA US2412573

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Dec. 17, 1946.
2,412,573
w. G. FRASER, JR
HEAT EXCHANGE APPARATUS
Filed April 15, 1942
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2,412,573
Patented Dec. 17, 1946
UNITED, STATES vvHPA'l‘EN'l‘ ' OFFICE
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2,412,513
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HEAT EXCHANGE APPARATUS
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I
Walter G. Fraser, Jr., Prospect Park, Pa., assignor
to Westinghouse Electric Corporation, East
Pittsburgh, Pa., a corporation of Pennsylvania
Application April 15, 1942, Serial No. 438,972
6 Claims.
(Cl. 257-32)
1
2
,
This invention relates to heat exchangers, more
from the subcooling section into the condensin
‘ particularly to heat exchangers wherein provision
section.
Yet anotherobject of the invention is to pro
is made for subcooling the condensate, and it has
for an object the provision of improved apparatus
of this character.
vide a vertical heat exchanger with subcooler in
'which the usual external hot well and piping
therefrom to the subcooler are eliminated.
These and other objects are effected by the
invention as will be apparent from the following
description and claims taken in connection with
10 the accompanying drawing, forming a part of this
application, in which:
Fig; 1 is a longitudinal sectional view of a heat
'
The trend in high-pressureheater practice is
to use a subcooling section for increasing the heat
recovery from the bled steam and thus reduce
the quantity or" steam required. The subcooler
should be con?ned to the ?rst water pass, but
the amount of surface required is normally very
much less than the surface in this pass. While
ba?ie structure may be provided to segregate as
exchanger embodying the present invention;
Fig. 2 is a transverse sectional view taken along
much of the ?rst pass surface as is required for .
subcooling duty, generally this is not satisfactory, 15 the line Ii—lI of Fig. 1, loolfing in the direction
of the arrows; and,
as only part of the feedwater is thus utilized for
Fig. 3 is a view similar to Fig. 2, but showing
subcooling and the rise in temperature of the
a modi?cation of the invention.
feedwater in the subcooler is thus increased, with
Referring now to the drawing more in detail,
a resultant penalty on the mean temperature dif
ference between the cooling water and the con 20 there is shown, at l0, a heat exchanger of the
densate in this section. This, of course, increases '
the amount of surface irequired in both the sub
cooling and the condensing sections.
Hence, the most economical arrangement is to
partition off the required part of the ?rst vpass
nearest to the inlet tubeplate for use as a sub
cooling section.
Where the feedwater heater is of the vertical
type, it is proposed to partition on‘ the coolest
.
vertical type comprising a, shell ll having an eX- '
haust steam inlet l2 and a condensate outlet 53.
A plurality of tubes I! extend vertically within
the'shell H and have their lower terminal por
tions extending through and supported by a bot
tom tube plate l5 which serves to close the lower
end of the shell. A waterbox I6 is associated
with the tube plate l5 and it contains a trans
verse partition l‘l dividing the space within the
portion of the tubes of the ?rst Water pass (it 30 waterbox into an inlet chamber l8 and an outlet
chamber l9. _ The upper terminal portions of the
being assumed that the Water enters at the bot
tubes extend through and are supported by an
tom of the heater) and to collect the condensate
upper tube plate 21 having associated therewith
at the lowest portion of the condensing section
a cover 22, the plate and cover providing a re
and then to direct this condensate to the upper
portion of the separated subcooling section by ‘ versing chamber 23 which, in cooperation with the
divided waterbox l6, provides for circulation of
conduit means provided within the heat exchang
water through the tubes I‘ in two passes. The
er, thereby avoiding the necessity of providing the
upper end of the shell ll may be closed in any
usual external hot well and piping heretofore re
suitable manner, as by the cover 24. The space
lied upon for conveying condensate from the con
40 surrounding the cold ends of the tubes of the
densing section to the subcooler.
?rst water pass is separated from the‘remaining
In order to obtain maximum heat transfer be
space within the heat exchanger by a pair of
tween the condensate and ‘the tubes of the sub
vertical transversely-extending partitions 26 and
cooler, it is necessary to maintain relatively rapid
21 and a semi-cylindrical partition 28 cooperating
flow of condensate past the tube surfaces and
such rate of ?ow can be obtained best by the 45 therewith. The vertical partitions 26 and 21 are
spaced apart ‘to provide therebetween a, conduit ,
presence of a sufficient pressure differential be
29 communicating at the bottom, at 3|, with the
tween the condensing section and the exit of the
lowest portion of the condensing section of the
subcooling section. It will be apparent that leak
heat exchanger and at the top, at 32,'with the
age of steam from the condensing section to the
subcooling section would result in decreaseof 50 upper portion of the subcooling section 25.
The top of the subcooler is closed by a hori
this pressure di?erential, and any such leakage
zontal partition 33 upon which rests a sheet of
should be avoided. Therefore, it is an object of packing material 34 held in place by a plate 35.
this invention to provide a suitable water seal
It will be noted that the partition structure 33,
between the condensing and subcooling sections,
particularly at the point where the tubes pass 55 34 and 35 is positioned slightly below the upper
aciasva
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4
iii
edge of the partitions 26 and 28 so" that there is
provided an upwardly projecting dam member 36
' valve when the level of condensate in the con
adapted to retain on the horizontal partition a
layer of condensate falling thereon from the con
respectively, with respect to the point of com
munication oi the vertical passageway with the
densing portions of the tubes of the ?rst water
condensing space.
densing space of the heat-exchanger rises or falls,
_
3.. A heat exchanger comprising a vertically
case.
disposed shell having a steam inlet and a con
To maintain the subcooling section ?ooded at
densate outlet; a, plurality of tubes extending lon »
all times, the condensate discharge conduit Mi is
gitudinally of said shell; 2. tube plate closing the
provided with valve means Bl controlled through
suitable linkage t2 and (it to respond to change in 10 lower-‘end of the shell; waterbox structure asso
ciated with said tubes and tube plate and provid
position of a ?oat member Mi disposed within the
ing for circulation of water through the tubes in
housing 65, the latter being in communication
a plurality of passes; means dividing the space
with the condensate collection space of the heat
within the shell into a condensing section and a
exchanger through conduits 86 and 431.
Any suitable vent means, such as the tube 139, 15 subcooling section, the latter including the con
densate outlet and the cold ends of the tubes of
serves to maintain the suhcooler free from accu
mulations of gases.
m Fig. 3, which is a view similar to Fig. 2 but
the first water pass; said means comprising a, ver
tical partition surrounding the‘subcooling section
and having sealing engagement at its lower edge
taken at a slightly higher plane and looking down
upon the top of the 'subcooling section, there is 20 with the tube plate, and a horizontal partition
having sealing engagement with the upper end of
shown a modi?cation of the partition structure
the vertical partition and closing the subcooling
de?ning the subeooling section. In this arrange
section; and means providing a conduit for ?ow oi’
ment, the vertically-disposed transverse ha?fies
condensate from the lowermost portion of the con
26a and 27a extend the full width of the shell and
are sealed in respect to the side walls of the latter 25 densing section to the uppermost portion of the ‘
subcooling section.
by suitable means, such as the laminated metallic
4. Structure as speci?ed in claim 3, wherein the
seals 51!. Likewise, the horizontal ba?e 3342 ex
tubes of the first water pass extend through the
tends to the side walls of the shell and is sealed
horizontal partition, and the upper edge of the
with respect thereto by a similar seal 52,, this
arrangement permitting omission of the semi 30 vertical partition extends above the horizontal
partition to form a dam for maintaining the lat
cylindrical partition 28.
,
ter covered with condensate to provide a liquid
While the invention has been shown in but one
form, it will be obvious to those skilled in the art
seal thereon.
5. A heat exchanger comprising a, vertically
that it is not so limited, but is susceptible of vari
clisposed shell having a steam inlet and a con
ous changes and modi?cations without departing
densate outlet; a plurality of tubes extending lon
from the spirit thereof, and it is desired, therefore,
gitudinally of said shell; 8. tube plate closing the
that only such limitations shall be placed there
' upon as are speci?cally set forth in the appended
lower end of the shell; waterbor»: structure asso
ciated with said tubes and tube plate and pro
What is claimed is:
40 viding for circulationpf water through the tubes
1. A heat exchanger comprising a vertically
in a plurality of passes; means dividing the space
disposed shell having a steam inlet and a con
within the shell into a condensing section and a
subcooling section, the latter including the con
densate outlet, a plurality of tubes extending ver
tically of said shell, waterbox structure associated ' densate outlet and the cold ends of the tubes of
‘with said tubes and providing for circulation of ' the ?rst water pass; said means comprising a
water through the latter in a. plurality of passes,
vertical partition structure having sealing en
- gagement at its side edges and bottom edge with
and means segregating a section of the heat ex
the shell and the tube plate, respectively, and a
changer which includes the condensate outlet and
horizontal partition having sealing engagement
‘the cold ends of the tubes of the ?rst water pass
from the remainder of the heat exchanger to de 50 with the shell and the upper end of the vertical
partition structure; and means providing a Pas
?ne a subcooler, said means including a pair of
vertical partitions arranged in spaced substan
sage for ?ow of condensate from the lowermost
portion of the condensing section to the upper
tially parallel relation to de?ne therebetween a
most portion of the subcooling section.
vertical passageway communicating at the bottom
with the lowest portion of the heat exchanger 55 6. Structure as speci?ed in claim 5, wherein the
condensing space and communicating at the top
tubes of the ?rst water pass extend through the
horizontal partition, and the upper edge of the
with the interior of the subcooler for ?ow of con
densate from the condensing space to the sub
vertical partition structure extends above the hor
izontal partition to provide a dam for maintaining
cooler interiorly of the shell.
2. Structure as speci?ed in claim 1, including 60 the latter covered with condensate to form a liquid
valve means controlling discharge of condensate
seal thereon.
through the condensate outlet from the subcooler
and including means for opening and closing the
WALTER G. FRASER, JR.
’ claims.
.
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