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1 March 29, 1949.
Filed June 25, 1946
2 Sheets-Sheet 1
March 29, 1949.
Filed June 25, 1946
2 Sheets-Sheet 2
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' 70M I P
Patented Mar. 29, 1949
- 2,465,921
Tom J. Peters, Chicago, 111., wignor to Carnegie
Illinois Steel Corporation, a corporation of New
Application June 25, 1946, Serial No. 879,108
2 Claims. (01.1344)
of cleaning is thus expensive, particularly be
This invention relates to a method of clean
ing ?ues. such method being‘ particularly advan
cause of the necessary relatively long period of
inactivity of the furnace. In addition, it is not
very effective, since the slag accumulations in
tageous when employed in the cleaning of rec
- tangular dues of relatively small cross section,
such as those in open hearth checkers and blast
ii the ?ues are hard and resist hand scraping and
furnace stoves.
Among the objects of the invention is the pro
, The present invention provides a power driven
vision of an improved method of cleaning ?ues of
?ue cleaning apparatus in which one or more
?exible cleaning members, traveling. in an arc
the type described above, such method being
characterized by‘the ease with which it is carried 10 when free of contact with the ?ue, such are in
out and the thoroughness 'of cleaning effected
tersecting the surface of the ?ue, are caused
initially to strike the ?ue surface with a substan
tial impact and subsequently to travel thereover
These and further objects of the invention will
be more readily apparent in the following de
, with a wiping action. Such cleaning action pref
scription of preferred embodiments of the method 15 erably takes places in the vicinity of the one or
more sharp longitudinally extending corners in
and apparatus which are illustrated in connec
the ?ue.~ Such cleaning member thus cracks
tion with the cleaning of lines in open hearth fur
the accumulation of slag on the ?ue, by reason of
nace checker work. It is to be understood, how
its initial impact thereon, arid then removes it
ever, that the invention is not restricted to the
particular illustrative example, but that it may 20 from the ?ue surface by its subsequent wiping
be used to advantage in the cleaning of various
action._ The application of such member in the
types of fines, particularly ?ues of-relatively small
vicinity of the sharp corners, where the slag de
cross section of which the inner surface includes .. posit is heaviest, is particularly advantageous
since it was at such corner that previous ?ue
one or more relatively sharp longitudinally ex
25 cleaning methods were least effective.
tending corners.
The invention will _be more readily understood
Air for combustion in an open hearth furnace
is preheated by passage through hot checker
by reference to the accompanying drawings, in
bricks. The products of combustion are drawn
off the furnace through checker bricks on the
opposite side from the burner being operated,
such hot products of combustion yielding, their
heat to the checker bricks through which they
pass on their way to the stack. The direction of
the ?ow of the gas is periodically reversed, one
Figure 1 is a view in side elevation of a preferred
embodiment of a cleaning head, portions of such
head being shown in cross section, the section be
ing taken along the line I-I of Figure 2;
Figure 2 is a view in end elevation of the por
tion of the cleaning head shown in Figure 1 in
set _of checkers being cooled while the other is 03 ,v1 the vicinity of the cleaning means;
heated. It is inevitable that the products of com
Figure 3 is a view in end elevation of a modi
bustion carry with them fumes and ?nely divided
fied cleaning means;
particles of oxides and slags. and that such fumes
Figure 4 is a view partially in side elevation and
and particles gradually accumulate on the checker
partially in section of the cleaning means shown
brick so that the checker openings eventually 40 in Figure 3, the section being taken along the line
become coated therewith to such depth that the
IV,-IV, of Figure 3;
passage of gas is impeded. When such point of
Figure 5 is a view in isometric projection of a
the operation of the furnace is reached, the fur
checker work with the preferred embodiment of
nace must be shut down and the checker work
the cleaning head inserted therein in operative
cleaned so as to remove such deposits from the 45 position; and
?ues of the checker work and to restore the ?ues
Figure 6 is a schematic view showing the man
to their original cross section.
ner of operation of the preferred cleaning means,
Heretofore the ?ues and checker work has been
such view being an end elevation taken from a
cleaned by laborers using long, handled scrapers
plane containing the end wall 54, and in the di
and brushes which were inserted in and pushed 50 rection toward the reader, in Figure 5.
or pulled through each ?ue. Such work is diffi
A preferred embodiment of the cleaning appa
cult and time consuming, requiring, on a 110 ton
ratus is shown in Figures 1 and 2. ‘Such appa
capacity open hearth furnace, approximately 84
ratus consists of a cleaning head having a cas
man hours with a lay-down period of the fur
ing consisting of a main portion 2 housing a ro
nace of approximately 24. hours. Such method 55 tary air motor supplied with compressed air
‘through the ?exible hose 6, the air supply being
slag and the like from the ?ue. particularly at
controlled by the shut-off valve 4. When used in
the corners will be somewhat clearer by consid
eration of Figure 6, in which the modi?cation
employing chains as the cleaning members is
illustrated. It will be seen that but for the dis;
the preferred manner the cleaning head as a
whole is lowered‘ progressively through each ?ue
by means of the air hose 6. The main portion 2
of the casing is provided on its forward end with
a casing sleeve 8 Within which is rotatably car
ried the shaft l0 driven by the air motor. Con
nectedto‘the' forward end of sleeve 8 is a further
housing portion l2 positioned transverse to sleeve
8, housing portion l2 rotatably carrying the driven
transverse shaft I4.
turbance in their position caused by contact with
the ?ue walls, the chains 28, which in Figure 6
are shown traveling counterclockwise, tend" to
occupy positions ‘radial of the disk‘ and the outer
10' ends thereof tend to travel-'in the are A when
free of 'the ?ue walls. Initial contact between
the outer end of each chain and ?ue wall is in the
Shafts Ill and I4 are drivingly interconnected
nature of a hammer blow, subsequent contact be
by means of meshing bevel'gears, gear It being ': tween the chain and the ?ue wall in one traverse
keyed to shaft l0 and gear i8 being keyed to'
thereof being in the nature of a wiping contact.
shaft l4. The two outer ends of transverse shaft
Such initial hammer blow and the subsequent
l4 are provided with reduced outer ends 20 which
are threaded as shown to receive the disks 22 and
the retaining nuts 24. The portions of shaft l4
" wiping or scraping of the ?ue wall by the outer
between the further transverse housing portion
l2 and the disks are protected by sleeves 26. In
the embodiment shown in Figures 1 and 2 disks
22 are provided at the rim thereof with a plural
ity of short chains 28 spaced at equal angles
around the disk. The chains are chosen of such 25
end of-the chain cracks the slag accumulation
and removes it from the ?ue in the vicinity of
the portion contacted by the chain.
In some instances ‘it is su?icient to pass the
cleaning head through the ?ue in one angular
position only relative to the ?ue since the crack
ing of the accumulation on one side of the corner
of the ?ue tends to loosen it in other positions,
length, as will be apparent from a consideration
such as on the other wallat the other side of
of Figures 5 and 6, discussed below, that when
the disks are rotating at su?‘icient speed to main
the corner. It is preferred, however, particularly
in view of the speed with which the operation is
accomplished, where the ?ue is of such dimen
tain the chains in a position substantially radial
of the disks, the outer ends of the chains, when 30 sion as to receive the cleaning head in two angu
free of contact with the ?ue, travel in an are
larly spaced positions, to employ a plurality of
which intersects the sides of the ?ue into which
such. passes through the ?ue. In the case of the
the cleaning head is introduced.
square ?ue illustrated in Figure 5, after one pass
In a further modi?cation of the apparatus,
of the cleaning head in the angular disposition
shown in Figures 3 and 4, relatively stiff but ?ex
shown the head is withdrawn from the ?ue and
ible brushelements are employed on the disks
reinserted in a position 90° from that in the ?rst
rather than chains. In this modi?cation the
pass so that the ends of the chains then act upon
brush element carrying disks are designated 30,
the end walls 52 and 54 in locations slightly in
such disks being provided on their outer sides
wardly of the corners.
with counterbores 32 to receive the retaining nut 40 ' Use of the preferred embodiment of the ?ue
24 and thus to allow the disk closely to approach
cleaner shown in Figures 1 and 2 has markedly
the ?ue end wall. Each disk 30 is provided with
reduced the amount of labor necessary to clean
a plurality of radially disposed brush elements
?ues in apparatus such as open hearth checkers
34 on the rim, elements 34 conveniently being
and hot blast stoves. When the checkers of the
stiff wire brushes. Each disk may further be pro—
110 ton capacity furnace previously mentioned
vided on its outer side with a plurality of equally
are cleaned by such apparatus. it is necessary to
spaced brush elements 36 extending parallel to
expend but seven man hours for the total op
the axis of the disk. Elements 36 may, as shown
eration. In addition, the overall furnace lay
in Fig. 3, be spaced at varying radial distances
down time to allow such operation is but 8 hours
on the disk in order completely to cover the ?ue
as compared to the 24 hours previously required
end wall.
when the described hand cleaning methods were
A typical manner of use of the cleaning appa
ratus of the invention is shown in Figure 5, in
Having thus fully disclosed prefered embodi
which there is shown the upper surface of a typi
ments of the method and apparatus for cleaning
cal open hearth checker work 38 made up of
?ues in accordance with the teaching of the in
checker bricks 40 laid in a basket weave. In such
vention, I desire to claim as new the following:
checker construction the ?ues 42 extend verti
1. A method of cleaning ?ues having two op
posed longitudinal corners comprising progres
cally and are square in cross section. The clean
ing head is inserted into a ?ue as shown and is
progressively let down into the ?ue by paying
sively subjecting the ?ue longitudinally thereof
in two opposed locations in the vicinity of and
on one side of said corners, to successive impacts
followed by wiping contact by at least one ?ex
ible member the outer end of which travels in
out the hose 6. The apparatus is designed so that
the length of shaft I 4 is slightly smaller than
the length of the ?ue dimension to which it is
parallel. It will thus be seen that when the motor
an approximately circular are when free of con
2 is initiated and the disks 22 set in rapid rota 86 tact with the ?ue, said are intersecting the ?ue
tion, the chains 28 will be impelled outwardly by
surfaces adjacent each of said opposed corners
centrifugal force, in the portions of their travel
and lying substantially in a plane containing the
wherein they are free from contact with the ?ue
opposed ?ue corners, and repeating the process
walls, and that they will strike such walls in the
above described with the ?exible member con
vicinity of the opposed corners 43. of the ?ue. In 70 tacting the ?ue surfaces on the other side of each
Figure 5 the opposed walls 48 and 50 are desig
of the opposed corners.
nated side walls and the opposed walls 52 ‘and 54
2. A method of cleaning a ?ue having a pas
are designated end walls.
‘ The manner in which the ?exible cleaning
sage in the form of a parallelopiped and a rec
tangular cross section having opposed side and
members function to remove the deposits 46 of 76 end walls comprising progressively subjecting
the ?ue longitudinally thereoi in two locations
summons cum
The following references are of record in the
?le of this patent:
on one side wall, adjacent its corners, and in two
locations on the opposed side wall, likewise ad'a
cent its corners, to successive impacts iollowed .
by wiping contact by at least two ?exible mem
bers, one oi which acts successively upon the ?ue
surfaces on the two opposed side walls adiacent
acts successively upon the ?ue surfaces on the
two opposed side walls adjacent the other end 10
wall of the ?ue, the outer end of each ?exible
member traveling in an approximately circular
arc when tree 0! contact with the ?ue, laid arcs
Henchen ........ -_ Mar. 1'1, 1931
Aurand .......... _.. Aug. 30, 1932
McCarthy ........ _. July 11, 1933
Turner .......... .._ Mar-.720, 1934
'rou ammo.
end walls, and repeating the process above de
scribed with the ?exible members contacting the
opposed end walls of the ?ue in the vicinity of
Fletcher ......... -- July 10, 1929
‘ 2,151,671 v
intersecting the opposed ?ue side walls and 1!
the corners.
Wright .......... .. Mar. 21. 1939
roman rs'rm'rs
Date 1
Great Britain ..... -..'. .... -- 1909
Great Britain ............ .. 1911
Germany --..--..---... Apr. 16, 1934
Germany -------- -. Jul! 14, 193'!
Germany “n-..”- Mar. 19, 1939
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