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Патент USA US3062518

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Nov. 6, 1962
G. D. BRADDON
3,062,508
PELLET CLEANING FOR ROTARY AIR PREHEATER
Filed Jan. 9, 1961
INVENTOR.
Gearge 5 5’50/0/0/7
BY
a/W J02
United States Patent 0
3,862,508
Patented Nov. 6, 1962
2
1
outlet duct 22 to which an induced draft fan (not illus
trated) is usually connected. Upon rotation of the ro
3,062,508
PELLET CLEANING FOR ROTARY AIR
PREHEATER
George D. Braddon, Wellsville, N.Y., assignor, by mesne
assignments, to Combustion Engineering, Inc., a stock
corporation of Delaware
Filed Jan. 9, 1961, Ser. No. 81,625
2 Claims. (Cl. 257—265)
tor about its axis a stream of cool air from inlet 23 passes
over the heated plates to absorb heat therefrom before
being directed to a boiler furnace or other place of use
through an outlet duct 24. A housing 26 enclosing the
rotor is provided at either end with end or sector plates
28 that are apertured at 32 and 34 to permit the streams
of gas and air to be directed through the rotor.
The mass of heat transfer plates carried by the rotor
This invention relates to heat exchange apparatus of 10
10 is in accordance with the invention divided into up
the rotary regenerative type and particularly to a unique
per and lower element layers 36 and 38 respectively with
arrangement for the removal of caked products of com
an inter-element space 42 axially aligned with openings
bustion and other deposits from the heat absorbent ele
44 that are evenly spaced, one to a sectorial compart—
ments of such apparatus on which they become deposited
15 ment, around the periphery of the rotor post 14. Hard
and tend to accumulate during operation.
Rotary regenerative heat exchange apparatus of this
type comprises essentially a housing having spaced end
plates that are formed with openings through which hot
ened steel liners 46 are ?tted to each opening 44 to pro
vide maximum resistance to abrasion by a stream of
‘gas and cooler air are directed.
each opening 44 to the space 42 during operation of the
cleaning pellets that are periodically directed through
A rotor mounted for
rotation about its axis in said housing includes a cylin 20 cleaning device.
The apparatus for supplying the cleaning pellets to the
drical rotor shell that is joined to a central rotor post by
inter-envelope space 42 comprises essentially a supply
radial partitions to provide a series of sectorial compart
duct 48 that extends down through the hollow rotor post
ments. Each such compartment is packed with a mass
but is carried by the upper end plate 28 or other struc
of heat absorbent material in order that upon rotation of
the rotor the mass of heat absorbent material is alternate 25 ture independent from the rotor in order that the supply
duct may remain ?xed while the rotor turns about. The
ly subjected to the hot gas and cooler air. Thus upon
lower end 54} of supply duct 48 lying within the rotor
rotation of therrotor, heat from the hot gas is continu
post is bent normal thereto and ?ared to present its outer
ously transmitted to the cooler air through a heat absorb
periphery in substantial alignment with the liners 46 that
ent intermediary.
During operation of the heat exchanger, soot and other 30 surround the openings 44 in the rotor post. A cylin
drical valve housing 52 surrounding the ?ared end por
products of combustion tend to collect on the heat ab
tion of the supply duct is coaxial with the supply duct
sorbent elements and reduce the free area of the ?ow
48 and is secured thereto at 53 while an outlet duct 54
passageways therethrough so as to substantially reduce
depending from the funnel shaped lower end of housing
the effectiveness of the heat absorbent elements. Clean
ing apparatus that supplies a quantity of air, steam or water 35 52 is directed through the lower trunnion and support
bearing 16 to a collecting line 58 that is also connected
to the deposits on the elements is customarily used to
by means of a duct 60 with a collection hopper 62 sub
remove the deposits and open the ?ow passageways there—
jacent outlet duct 22 for the hot gas.
through. However, certain deposits defy removal by
The valve housing 52 has but a single radial opening
such usual means and the principal object of this inven
tion is therefore to provide an arrangement by which an 40 64 ?xedly aligned with the ?ared end 50 of the supply
duct 48. The housing 52 slidably abuts the end edge of
abrasive material in the form of pellets or shot may be
liners 46 to preclude ?uid ?ow therebetween while the
etfectively supplied during operation to the heat absorb
?ared end 50 is spaced from the inner surface of hous
ent element of a rotary regenerative heat exchange ap
ing 52 to permit pellets rebounding from liners 46 to fall
paratus whereby the deposited products of combustion
back into the housing 52. A series of ?ow vanes 66 are
may be removed therefrom.
axially spaced in the ?ared end 50 to project pellets
A further object of this invention is to provide an ar
therefrom to radially spaced portions of the rotor in or
rangement by which the cleaning action is supplied only
der that each compartment may receive a concentration
to a particular portion of the element that is subject to
of pellets in accordance with the frontal area of the heat
the greatest concentration of deposited combustion prod
ucts.
50 absorbent element carried thereby.
A pneumatic feeding device 68 collects pellets from
The invention will be best understood upon considera
tion of the following detailed description of an illustra
tive embodiment thereof when read in conjunction with
the accompanying drawings in which:
FIGURE 1 is a sectional elevation of a rotary regen
erative heat exchanger showing the basic arrangement
of apparatus that comprises the invention.
55
ducts 58 and 60 and elevates them to a pellet release
tank 69 where they are maintained under a residual pres
sure determined by a relief valve 70.
In operation pellets maintatined under pressure in pel~
let release tank 69 are directed down through duct 48v
to its ?ared end 50 where the pellets are projected radial
FlGURE 2 is a horizontal section of the valving ar
ly outward into the inter-element space 42. As the pel
rangement as seen from line 2—2 of FIGURE 1.
lets fall and strike the element layer 38 on which excess
60
In FIGURE 1 the numeral 10 designates the cylindrical
products of combustion have accumulated, the deposited
shell of a rotor that is divided into sector shaped com
combustion products are freed from the element by the
abrading action of the pellets. The combustion products
partments by a series of radial partitions 12 that are con
are entrained in the gas stream while the heavier pellets
nected to the rotor post 14 and to the rotor shell 10.
The rotor post 14 is rotatably supported by bearings 15 65 descend to hopper 62 and to collecting line 58 where they
are directed to release tank 69 by means of feeding de
and 16 and is rotated about its axis by driving means il
vice 68. As the rotor turns about its axis each opening
lustrated at 18. The rotor compartments each contain
44 is sequentially aligned with the ?ared end 50 of duct
a mass of heat absorbent material, usually in the form of
48 such that the heat absorbent element 38 of each com
spaced metallic plates, which absorb heat from hot gases
entering the preheater through a duct 20. After the hot 70 partment is periodically subjected to the abrading action
of the pellets.
gases pass over the metallic plates and transfer a portion
While this invention has been ‘described with respect
of their heat thereto, the then cooled gases pass to an
8,062,508
a
a.)
4
to the embodiment illustrated in this drawing, it is evi
dent that various changes may be made without depart
ing from the spirit of the invention. It is therefore in
tended that all matter contained in the above descrip
tion or shown in the accompanying drawing shall be in
streams of hot gas ‘and cooler air; a rotor mounted for
rotation within said housing having a cylindrical rotor
shell; a rotor post coaxial with said rotor shell; radial
partitions extending vbetween the rotor shell and rotor
post to provide a series of sectorial compartments there
between; upper and lower element layers in each com
terpreted as illustrative ‘and not in a limiting sense.
What I claim is:
partment spaced to include an inter-element space; a se
ries of circumferentially spaced openings in the rotor post
in axial alignment with the inter-element space; a pellet
1. Rotary regenerative heat exchange apparatus hav
ing a housing including spaced end plates formed with
openings for the ?ow therethrough of spaced streams of
release tank above said rotor and mounted independent
therefrom; duct means carried by the pellet release tank
and extending through the rotor post; a ?ared pellet noz
zle connected to said duct means extending normal there
to into confronting relation with the openings in said
rotor post adapted to project a stream of pellets from
said tank to the lower element layer; an inner housing
within the rotor post enclosing the flared nozzle and in
cluding an opening in radial alignment therewith; a pneu
hot gas and cooler ‘air; a rotor mounted in said housing
having a cylindrical rotor shell; a rotor post coaxial with
said rotor shell; radial partitions extending between the
rotor post and rotor shell to provide a series of sectorial
compartments there‘between; upper and lower layers of
heat absorbent element having an inter-element space,
carried in each sectorial compartment; a series of circum
ferentially spaced ports in the rotor post in axial align
matic feeding device; duct means directing pellets from
tank mounted independent from said rotor and adapted 20 said inner housing and said cylindrical housing to the
pneumatic feeding device; and duct means interconnect
to carry a supply of cleaning pellets; duct means extend
ing the pellet feeding device and the pellet release tank
ing through the rotor post from said tank having a radi
adapted to direct pellets under pressure to said tank
ally facing end port confronting the spaced ports of the
whereby they may 'be continuously supplied to the com
rotor post; a cylindrical housing within the rotor post en
closing the radially facing end of said duct and having 25 partments of the rotor.
an opening therethrough in alignment with said end port
References Cited in the ?le of this patent
in the end of said duct whereby pellets are directed
through the housing opening to the inter-envelope space;
UNITED STATES PATENTS
land duct means depending from said cylindrical house
2,762,610
Puhr-Westerheide ____ .__ Sept. 11, 1956
ing adapted to carry pellets that rebound into said hous 30 2,766,969
Cooper et al. ________ .._ Oct. 16, 1956
ing after striking the inner end of the radial partitions.
2,809,018
Broman _____________ __ Oct. 8, 1957
ment with the space between element layers; an enclosed
2. Rotary regenerative heat exchange apparatus hav
ing ‘a cylindrical housing including spaced end plates
formed with openings for the flow therethrough of spaced‘
FOREIGN PATENTS
35
1,139,747
France ______________ __ Feb. 18, 1957
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