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Патент USA US2355021

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Aug. 1, 1944.
J. wArrKus
2,355,021
WASHING APPARATUS FOR AIR PREHEATERS
Filed Aug.’ 8, 1941
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ATTORNEY‘
2,355,021
Patented Aug. 1, 1944
UNITED STATES; PATENT OFFICE
7 ~ WASHING
~ ~ ~
PREHEATERS
APPARATUS FOR Am :
Joseph Waitkus,y_Wellsville, N. Y., assigno'r'to The '
Air Preheater Corporation, New York, N. Y.v
Application August 8, 1941, Serial No. 405,939
‘
6 Claims.
The present invention relates to heat transfer
apparatus and particularly to improvements in
apparatus for washing the heat transfer surfaces
of rotary, regenerative, air’ preheaters, such as
Ljungstrom preheaters;
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'
1
In the Liun‘gstrom ‘air preheater metallic heat
transfer plates carried in compartments of a
rotor absorb heat in passing through the gas side
(01. 257-1)
‘
"
fer elements 16 in the form of undulated metallic
plates. The rotor is turned slowly clockwise, for
example, aboutza vertical axis by a motor 20'
geared by a speed'reducer 22 to the'rotor shaft
_ 24 so that the heat transfer elements are turned
slowly to vfirst absorb heat from hot gases pass.
ing to the outlet duct 26 at the gas side of the air
preheater and when rotor movement positions
them in the air side of the preheater the heat
of the preheater and subsequently. they are turned
into position to yield their heat to air flowing 10; transfer elements yield their heat to air entering
the preheater through the‘ air inlet duct 28'.
In accordance with the present invention the
preheater is provided preferably on the air side
transfer plates from the gases ?owing thereover.
with. a nozzle >30 rotatable in a circular path
Soot blowers ‘are ordinarily provided for remov-'
ing these deposits. However, experience has in 15.; above the rotor [2. As shown, the nozzle is at
the end-of a right angled extension 32 of a pipe
dicated that the deposits are heaviest‘ at points
34 mounted for rotation clockwise, for example,
near the innermost portions and also in the outer
about a vertical axis-substantially in the center
parts of the compartments because the soot
of the air duct. The diameter of the circle of
blower does not clean these surfaces as effec
rotation
of the nozzle-is preferably nearly equal
20'
tively'as it cleans ‘the plates which are in the
to the radial depth of the sector compartments
center portion of the various‘compartments of‘
in which the heat transfer'plates are mounted so
the rotor.
that all may be washed. The pipe 34 is guided
' The present invention contemplates apparatus
forrrotation in a bearing 36 on a housing 38
for cleaning the heat transfer surfaces in the
rotor compartments bycontinuously directing a '25 suitably attached/to'the air duct wall or'the
framework of the preheater. Intermeshing bevel
stream of water thereover. This is eifected by 7 gears 40, 42 on the-pipe-34 and a shaft 44 driven
means of a nozzle rotating in av circular path
throughsuitable reduction gearing by a motor 46
above the rotor in the same direction as the latter
provide a means by which the pipe 34- maybe
on the air side of the preheater. Near the center
rotated and the nozzle 30 swung slowly in a cir
30
and also near the outer edge of the rotor the
cular path. Water is- supplied to the nozzle pipe '
path of‘ the nozzle is tangential to the ‘path of
through a supply line 48 which extends into the
movement of the heat transfer elements in these
housing 38 and is provided with a coupling 5!]
parts of the rotor: compartments. Hence, largerv
suitable for connecting it to the rotatable pipe 34.
quantities of water ‘?ow over these‘elements be-'
Preferably, the motor 46 operates whenever the.
cause of the fact that the movement of the nozzle
preheater is in- use and water is continuously
relatively to the movement of the elements‘is
supplied to the nozzle 30. As the latter is moved
slowest at'the'se points.
'
clockwise, for example, in a circular path above
The invention will be best understood upon
the heat transfer plates passing therebeneath,
consideration of the following detailed descrip
tion of an illustrative embodiment when read in‘ 40. the particles of soot, ash-and other deposits are
removed from‘ the heat transfer elements by the
conjunction with the accompanying drawing in
stream of water ?owing thereover. Inasmuch as
the
clockwise movement of the nozzle is tangen
of
a
Ljungstrom
air‘
Figure 1 is a plan view
tialto the path; ofclockwise movement of the
preheater provided ‘with washing apparatus in
accordance with the present invention, some 45 elements when the nozzle is near the outer ends
of the compartments, the rate of relative move
parts being shown in section;
ment
between the nozzle and plates is lowest due
Figure 2 is a sectional view on the line 2—2 in
through the air side of the preheater. Soot and
ashes are deposited on the surfaces of the heat
which
'
Figure 1; and
'
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T
'
,
Figures 3 and 4 are sectional views of an al
to their moving in the same direction and a rela
tively greater amount of water flows over the heat
50 transfer elements in the outer parts of the com
ternative detail of construction.
partments than over elements located nearer to
In the drawing the numeral l0 designates the
the center of the rotor. The speed of the rotor
casing of a Ljungstrom air preheater having a
may also be slowed down, if desired, to decrease
rotor l2 subdivided by radial partitions I4 to
the rate of relative movement and thereby in
form a number of sector-shaped compartments
each of which contains a plurality of heat trans 55 crease the effectiveness of the washing.
2
2,355,021
Instead of employing a separate motor 46 to
operate the nozzle 30 suitable connections may be
made so that it may be driven from the rotor
shaft 24.
about a center substantially coincident with that
of one of said ducts for swinging said nozzle in a
circular path with respect to the rotor portion
in said duct, said path having a diameter sub
stantially equal to the radial depth of the rotor
compartments; and means for slowly rotating
It may be considered undesirable for some in
stallations to wet the heat transfer plates l6
when they are positioned in locations where they
said arm in the same direction as said rotor.
will enter the hot gas side of the preheater before
4. In a regenerative air preheater having a ro
there has been an opportunity for water to drain
tor divided into compartments carrying heat
properly from their surfaces. For example, the 10 transfer surfaces for absorbing heat from hot
elements at the upper left hand portion of the ro- ~
tor in Fig. 1 might, if wetted, carry water into the
gas side of the preheater. One means of meeting 1 '
this condition is diagrammatically illustrated in
Figs. 3 and 4. In these ?gures the nozzle pipe
34a and the coupling member 50a are arranged '
like a plug valve. Part of the wall of the pipe 34a ,
is cut away near its upper end to receive water
gases ?owing through a gas duct and imparting
it to air ?owing through an air duct; a nozzle
‘supplied with a ?uid for cleaning said heat trans
fer surfaces; means for supporting said nozzle
for movement with respect to said rotor in a cir
cular path centered approximately in the middle
of one of said ducts, said path having a radius
approximately one-half the radial depth of the
rotor compartments; means for slowly rotating
from the chamber in the coupling member 50a.
When the port 501) leading from the chamber and 20 said nozzle and rotor in the same direction; and
coupling member 50a is obscured by the uncut
means controlled by the position of said nozzle
portion of the wall of the pipe 34a the ?ow of
for automatically discontinuing the supply of ?uid
washing ?uid to the nozzle 30 is cut off. By prop
erly proportioning and locating the port and the
to said nozzle as it moves, through a predeter
mined portion of its path.
uncutportion of the wall of the pipe 34a the ?ow 25
5. In a regenerative air preheater having a
of ?uid to the nozzles 30 may ‘be automatically cut
horizontally disposed rotor divided into compart
off over the desired arc in the circle of rotation'of
ments carrying heat transfer surfaces for ab-'
the nozzle pipe 30.
'
sorbing heat from gases ?owing through its gas
What I claim is:
’
duct and impart it to air ?owing through its air
1. In a regenerative 'air preheater having a ro
tor divided into compartments carrying heat
transfer surfaces for . absorbing heat from hot
30 duct; a rotatable arm of a length approximat
ing half theyradial depth of the rotor compart
ments; a nozzle carried at one end of said arm;
gases ?owing through a gas duct and imparting it
means for supplying a cleaning ?uid to said
to air ?owing through an 'air duct; a nozzle sup
nozzle; means for supporting said arm at‘ its
plied with a ?uid for cleaning said heat transfer 35 other end for movement about a center substan
surfaces; means for supporting said nozzle for
tially coincident with that of the air ducts for
movement with respect'to said rotor in a circu
swinging said nozzle in a circular path above the
lar path centered approximately in the middle
part of the rotor passing through said duct, said
path having a diameter substantially equal to the
radial depth of the rotor compartments; and
of one of said ducts, said path having a radius
approximately one-half the radial depth of the
rotor compartments; and means for slowly ro
tating said nozzle and rotor in the same direction.
2.'In a regenerative air preheater having a
means for slowly rotating said arm and rotor in
horizontally disposed rotor divided into compart
horizontally disposed rotor divided into ‘com;
partments carrying heat transfer surfaces for ab
sorbing heat from gases ?owing through its gas
duct and impart it to air ?owing through its air
ments carrying heat transfer plates for absorb
ing heat from gases ?owing through a gas duct
and impart it to air ?owing through an air duct;
the same direction.
,
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6. In a regenerative air' preheater having a
a nozzle supplied with ?uid for cleaning said
duct; a rotatable arm of a length approximating
plates; means for supporting said nozzle for
half the radial depth of the rotor compartments;
movement above said rotor in a circular path cent
tered approximately in the middle of one of said
ducts, said path having a radius approximately
one-half the radial depth of the rotor compart
ments; and means for slowly rotating said nozzle
and rotor in the same direction‘
3. In a regenerative air preheater having a
horizontal rotor divided into compartments car
rying heat transfer ‘plates for absorbing heat from
a nozzle carried at one end of said arm; means for
supplying a cleaning ?uid to said nozzle; means.
for supporting saidarm at its other end for move
ment about a center substantially coincident with
that of the air ducts for swinging said nozzle in
r a circular path above the part of the rotor pass
ing through said duct, said path having a diame
ter substantially equal to the radial depth of the
rotor compartments; means for slowly rotating
hot gases ?owing through a gas duct and im
said arm and rotor in the same direction; and
parting it to air ?owing through an air duct; a 60 means controlled by the position of said nozzle
rotatable arm positioned on the air duct above
for discontinuing the supply of water to said noz
said rotor; a nozzle carried by said arm; means
zle as it moves through a predetermined portion
for supplying a cleaning liquid to ‘said nozzle;
of its path.
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means for supporting said arm for movement
JOSEPH WAITKUS.
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