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Патент USA US3080003

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March 5, 1963
i ed July 17, 1959
J'fy- ff
United States Patent Óñice
Patented Mar. 5, 1963
FIGURE 2 is an axial section of the rotary regenera
tive heat exchanger as seen from line 2-2 of FIGURE 1.
FIGURE 3 is a diagrammatic representation of thermal
distortion in a rotor partition having a temperature gra
dient running from end -to end.
3,079 991
Ted- C. Evans and Charles A. Lyle, Welisville, NSY., as
signors, by mesne assignments, to Combustion Engi
FIGURE 4 is a diagrammatic representation of the
even expansion of a rotor partition ‘according to this in
vention wherein opposite sides of the same partition are
neermg, Ine., a corporation of Delaware
Filed July 17, 1959, Ser. No. 827,774
1 Claim. (Cl. 165-7)
subjected to opposite extremes of temperature.
In the drawing numeral 10 designates the cylindrical
This invention relates to rotary regenerative heat ex 10
shell of a rotor divided into sector shaped compartments
change apparatus and particularly lto an arrangement
11 by radial partitions 12 that connect to an axially cen
that substantially precludes its thermal distortion dur
tral rotor post 14 which is driven by a gearing arrange
ing periods of normal operation.
' In rotary regenerative heat exchange apparatus a cylin
ment 16 and dri-ving means (not illustrated) that turns
drical rotor having sectoral compartments provided by 15 the rotor slowly about its axis. The sector shaped‘com
partments 11 are adapted to contain regenerative heat
radial partitions or diaphragms that connect a central
transfer material 24 which first absorbs> heat from a
rotor post to a concentric rotor shell is adapted to carry
heating ñuid entering the regenerator through a duct
a mass of regenerative heat exchange material. The rotor
18 from a combustor or other source and is discharged
is adapted for rotation in such a manner that the heat
exchange material is ñrst exposed to a heating iiuid to 20 through an outlet 22‘ after havingl passed through the
bank of perforate heat Itransfer material 24. As the
`absorb heat therefrom, and as the rotor is turned about
rotor turns slowly about its axis the heated material 2_4
its axis, the heat exchange material is then disposed in
a passageway for a fluid to be heated'where the heat ab
is transported into a stream of the Huid to be heated
sorbed by the heat exchange material is imparted to the
that is admitted through duct 26. After passing over
the heated material 24 and -absorbing -heat therefrom,
the stream of heated iluid is conveyed through duct 28
ñuid ñowing therethrough.
During operation such apparatus is continuously sub
jected to varying degrees of temperature whereby varia
tions of thermal expansion resulting therefrom produce a
warping and twisting of the rotor and its surrounding
housing that generally precludes an efficient sealing of
to any predetermined place of use.
A housing 32 encloses the rotor and is provided at
either end opposite the latter with end or sector plates 34
which are apertured as at 36 in alignment with ducts
18-22 and 26-28. In order that the streams of heat
ing ñuid and the fiuid to be heated may be maintained
in completely different duets, sealing means are pro
vided at the `ends of the rotor to wipe against the sector
one fluid from another.
This invention is directed to a rotary regenerative
heat exchanger having a structural arrangement such
that temperature variations thereof induce substantially
constant expansion or contraction that results in -a mini
plates of other fixed pants of the rotor housing.
Since the heating fluid and the fluid to be heated are
usually directed through the heat exchanger in a counter
ñow arrangement, the inlet for the heating duid and the
outlet for the heated ñuid lie at adjacent ends of the
June l, 1954 to Per Hilmer Karlsson. In this patent the 40 rotor While the outlet for the cooled heating ñuid and
the inlet for the ñuid to be heated lie at the same end of
heat exchange element of a rotary regenerative heat ex
the rotor. Thus the rotor is divided into two basic tem
changer is arranged in axially disposed banks in such a
manner that fluid flowing through the heat exchange ma
perature zones, the one which lies adjacent the inlet for
the heating fluid being termed the “hot end” While that
terial is required to ñow in a radial direction to make
possible the use of a heat exchange element having a 45 adjacent the inlet for the liuid to be heated is termed the
“cold end” of the rotor. The radial partitions being part
large surface area and a relatively shallow depth.
of the rotor are thereby subjected t-o a temperature dif
Such -an arrangement directs the heating fluid and
ferential that effect an expansion 'at the “hot end” in the
the fluid to be heated across each partition in a manner
manner illustrated in FIGURE 3. A Series of such
such that the hottest fluid contacts one end of the parti
tion and the coldest ñuid contacts the other. The result 50 partitions formed into a rotor and similarly expanded
by variations of temperature produces a serious degree
ing temperature ditferential at opposite ends of a metallic
partition produces a variation of expansion that induces
of rotor distort-ion that precludes eñicient rotor operation.
severe deformation of vthe partitions and connecting hous
In accordance with the present invention the heat trans
mum of distortion.
The heat exchange apparatus particularly referred to
in this application comprises an improvement to the
type generally described in U.S. Patent 2,680,008, issued
ing structure to greatly reduce its operating efficiency.
fer material is supported in axially disposed banks inter
mediate the rotor shell and rotor post whereby laterally
adjacent banks of material together form a composite
annular mass of element concentric with the rotor axis.
structure that directs hot duid on one side of a metallic
The annular bank of heat transfer material 24 is provided
partition Iand cold ñuid on the side laterally opposite
with a multitude of radially disposed perforations in order
whereby the temperature of the partition tends to ap
proach a mean between the ‘temperature of the heating 60 that huid flowing between inlet and outlet ports is di
rected through the heat transfer material in a radial di
fluid and the lluid to be heated that is approximately
rection and in order that fluid will ñow in radial -opposite
uniform throughout the partition. Thus, while each
directions while traversing adjacent sectoral compart
partition is free to expander contract, with normal varia
ments, axial passageways 42 and 44 «are provided with
tions of temperature, the expansion will be uniform and
65 closure plates 46 at alternate ends thereof in the manner
not subject to distortion.
illustrated by FIGURE 2 of the drawing. By this ar
The invention will be more clearly described with
rangement, ñuid entering a radial outer passageway 4Z
reference to the embodiment Ithereof shown by way or" ex
The present invention is directed to an improvement
of the above described apparatus having a particular
flows axially until it is turned radially inward through
ample in the accompanying diagrammatic drawing in
the bank of heat exchange material to the inner passage
70 way 44. Here the fluid is again directed iaxially to con
FIGURE 1 is a partial top View of the heat exchanger
tinue its ñow to the exhaust duct. Conversely, ñuid en
utilizing the invention.
ytering Ia radial inner-passageway 44 ñows axially until
rotor post, and a housing surrounding the rotor shell pro`
vided at opposite ends with paired inlet and outlet ducts
it is directed radially outward through the bank of heat
exchange material to passageway 42 where it again is
Vdirected axially to the exhaust duct.
t „Thus >while fluid isll'owing radially> outward through
the'bank of -heat exchange material in one >sectoralv coru
jpartrnent, it is ñ'owing through thebanks of~e1ement in Y
for the ñow of a heating fluid and a fluid to be heated
to and through the rotor; axially extending banks of per
forate heat exchange material disposed similarly between
partitions of adjacent compartments Ito provide a com
posite annular mass of _heatexvchange material concen
tric with the rotor »taxis;taxia1 flow passageways adjacent
the. radial inner and outer Jsidesv of /thebanksrof heat-ex
~[the adjacentcompartments lin a yradially opposite direc
tion in such a manner that opposite vsides .of each partition
are subjected `to opposite extremesof temperature. Thus 10 change -material?providing radial inner and outerr'pas
_the1` partitions tend to1 arrive at. a mean between fthe aver
sageways for the flow ofiñuid toand fromthebanks of
heat exchange material; and closure means positioned
Yage‘temperature of the heatingfluid and Vthetfluid to be
heated. Under theseconditions the‘diaphragms will ex
:pand evenlywith they increase of temperature inthe man
4,11er„.illustratedçin FIGURE 4, therewill be no variable
_expansion a or. distortion, and» sealing. surfaces will _retain
„their .original clearance settings.
Í While this inventionthas been described with reference
.to _embodimentiillustrated :in the drawing, it is evident
`:that numerouschangestmay be made Awithout departing 20
.fromthe spiritof the invention. It is therefore intended
«that allnmatter contained .in the above description or
lnhowninîthe accompanying `drawings shall be interpreted
.as illustrative and Tnotiinla limiting sense.
`lWhat we claim-is:
-Rotaryregenerative ,heat exchange apparatus or .the
ilike lhaving‘a :rotor including a cylindrical rotor _shell
-îdividedfinto sectoral compartments by partitions that ex
tend radially. from .the rotor shell to an axiaIly central
«at alternate ends'iof laterally adjacent passageways and
_at alternate ends `of the radially inner and outerï passage
ways adapted to ,direct ñuid ñow ¿in radially `opposite di
rections through banks of: elementlying inla'terally .ad
jacent compartments whereby laterally opposite sides of
¿the radial partitions are subjected .to oppositeextremes
‘of iluid temperature.
SRefereneesïCite?in theiñle oflthis patent
1,586,816 ` >Ljungstrmn ____ ___`_`____ June„1,¿î19y2_6
Ljungstrom _____ -_
' Frey ___________ _a
__ Sept. 24, 1,929 '
jKarlsson ___*_______ _f_an'lunel, v19514
v_.,_tDera 27,1926
Great Britain _ _________ __ Aug. 7, _l-K9`57
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