Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The invention relates to apparatus, so adapted that
coking oven doors, having a sealing edge for placing on the
door frame, can be driven for cleaning purposes in front of
said apparatus which is provided with nozzles for discharging
pressurized water on to the door regions which are situated
close to the sealing edge and are covered with encrusted
deposits.
It is known that the parts which are to provide a
metal-to-metal seal in coking ovens between the door member and
the door frame are contaminated with tarry deposits which often
harden into crusts and are produced by condensation from the
constituents of the gas that is produced in coking. Cleaning
of the doors by mechanical cleaning elements is not always
satisfactory. Very costly and complicated machines, equipped
with rotating parts, are occasionally used to this end.
Attempts were therefore made to find other means for
cleaning doors with metal-to-metal seals. The prior art already
discloses a method for cleaning the doors and door frames of
coking ovens by means of high pressure fluid nozzles which
remove the deposits on the sealing surfaces of the door and
door frames by means of jets of high pressure fluid, discharged
upon the sealing surfaces at a pressure of 200 atm gauge. The
apparatus with the high pressure fluid nozzles should be
traversable and should travel in front of the door frames or
of the lifted-off doors. Overlapping spray cones of water are
discharged from nozzles which are distributed over the entire
sealing surface of the door or of the frame.
The inventor has found that water is unsuitable as a
cleaning agent for cleaning the door frames because removal of
the water discharged for cleaning leads to difficulties on the
oven platforms. It was also recognized that it is not important
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to clean the sealing edges but to clean the region between the
sealing edge and the door plug because this region is liable
to be affected by crust-like deposits the structure of which
can be loosened in some cases only by using pressurized water
jets of very high pressure.
The inventor has also recognized that pressures of
the kind necessary to remove encrusted dirt from between the
door plug and the sealing edge can be obtained only by using
a single nozzle.
The invention, the object of which is also to effect
door cleaning by means of pressurized water, therefore proceeds
from the fact that only a few pressurized nozzles can be simul-
taneously actuated and arrives at a suitable solution of the
problem by arranging the nozzles to traverse in the cleaning
device in the vertical direction thereof so that a substantial
portion of the contaminated region between the sealing edge and
the door plug can be treated with a single nozzle.
In apparatus, so adapted that coking doors, having a
sealing edge for placing on the door frame, can be driven for
cleaning purposes in front of said apparatus, the invention
proposes that a pair of nozzles, which is situated on both
sides of the inward-driven door, i9 aimed at the gap between
the sealing edge and the door plug and is spaced at a distance
from each other equivalent to approximately half the door height,
is disposed in a vertically adjustable frame, so that the top
and bottom angle subtended by the sealing edge can be subjected
to pressurized water, namely by the top nozzle in the top
position and by the bottom nozzle in the bottom position.
In the top limiting position the top nozzles ca~ be
pivoted and in the bottom limiting position the bottom nozzles
can be pivoted to the middle of door regions situated on the
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top and bottom horizontal portion of the sealing edge so
that the said regions can be subjected to pressurized water
for cleaning purposes.
Advantageously, the nozzles are disposed in
horizontal tubes which are situated on both sides of the
plug of the inward-driven door and are connected to pres-
surized water ducts and the said tubes can be inwardly
pivoted.
According to the invention, the frame which
supports the nozzle tubes can traverse by means of rollers
on the track rails of a vertical support column and can
thus rise and fall.
To protect the traversing frame against heat
radiated by the door plug, a thermally insulating protec-
tive sheath which surrounds the door plug is provided on
the frame between the pivotable horizontal nozzle tubes
situated at the top and bottom of the frame when the door
is in the inward-driven positior.
According to al~broad aspect of the present
invention there is provided an apparatus for cleaning
the regions of coke oven doors between a surrounding
sealing edge and a refractory door plug~ The apparatus
comprises a frame vertically reciprocable along the end
of a coke oven door which carries the sealing plug. A
first pair of nozzles is carried on the upper portion
of the frame and arranged to force fluid into the upper
portions of those regions of the coke oven door between
a surrounding sealing edge and the door plug. A second
pair of nozzles is carried on the lower portion of the
frame and arranged to force fluid into the lower portions
of those regions of the coke oven door between the
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surrounding sealing edge and the door plug. The nozzles
are pivotal about generally vertical axes such that the
first pair of nozzles can be pivoted inwardly when they
reach the upper edge of the coke oven door upon upward
movement of the frame to clean the region between the
upper edge of the door plug and the upper horizontally-
extending portion of the sealing edge. The second pair
of nozzles is pivotal inwardly when they reach the lower
edge of the coke oven door upon downward movement of the
frame to clean the region between the lower edge of the
door plug and the lower horizontally-extending portion
of the sealing edge.
In the accompanying drawings:-
FIGURE 1 is a side view of the apparatus accord-
ing to the invention with a raised coke oven door driven
in front of the apparatus for cleaning purposes,
FIGURE 2 is a section of Figure 1 to an
enlarged scale:
FIGURE 3 is a vertical section along the line
III-III of Figure l;
FIGURE 4 is a vertical section corresponding to
the line IV-IV of Figure 1 through the frame which supports
the traversable nozzle tube,
FIGURE 5 is a horizontal section according to
the line V-V of Figure 1 and shows a partial plan view
the rise and fall frame of the door cleaner; and
FIGURE 6 is a horizontal section according to
the line VI-VI of Figure 1.
As can be seen more particularly by reference to
Figures 1 and 5, the door to be cleaned has a door member 10
of U-shaped cross-section. Situated on the door member are the
sealing edge 31, clamped by means of hook bolts 30, and the
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refractory door plug 33, surrounded by the metallic plug holder
32,
More or less crusty, tarry deposits are usually formed
during the coking operation directly in the space situated
between the door plug 33 and the sealing edge 31, the removal
of which said deposits is the main object of the novel
apparatus.
The door which i9 lifted off the oven by known devices
is driven in ~ront of apparatus according to the invention for
the purpose of cleaning.
Apparatus of this kind can be fixedly installed on a
coke guide car or on the coke pushing machine and can be
arranged so that the removed door can be driven into said
apparatus with the side of its refractory plug, the sealing
edge being nearest to the cleaning apparatus.
The cleaning apparatus extends between a top roof
member 35 and a baseplate 36 and comprises a rigid support
column 11 with track rails 12 and 13. The frame which supports
the nozzle tubes can reciprocate vertically upon the said
support column. The frame comprises a fixed rear wall 14 and
a plurality of su~stantially square frames 34 mounted thereon.
The frame can be ralsed and lowered by the lifting device which
can be constructed as a hydraulically actuated jack 28.
Figures 1 and 2 show the frame in its lowest position.
A total of four roller holders 35 with rollers 15
which are rotatable about horizontal axes and run on both sides
on the track rails 12 and 13 of the support column 11 are situ-
ated on both side parts of the frames 34. The rollers 16 run
on the outsides of the track rails 12 and 13 and rotate about
horizontal axes which are situated perpendicularly to those of
the rollers 15.
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The nozzle tubes 18 and 19 are supported at the top
end of the frame and the nozzle tubes 20 and 21 are supported
at the bottom end of the frame so as to be pivot~ble about the
pivoting points 24 to 27, In the inoperative position the
nozzle tubes 18 to 21 are situated parallel with the side walls
of the refractory plug 33. The said nozzle tubes are able to
pivot due to their rear ends being coupled to the piston rods
22 of the two double-acting jacks 23 (Figure 5 shows a nozzle
tube in hatched form in the inward pivoted position). A
thermally insulating shield 17 which surrounds the refractory
plug 33 of the inward-driven door is arranged on the front of
the frame between the two planes in which the tubes 18 and 19
are situated on the one hand and the tubes 20 and 21 are situ-
ated on the other hand.
Pressurized water is supplied to the nozzle tubes 18
to 21 from the connecting duct 29 through the duct 39 to the
tube 19 and from there via the duct 40 to the tube 18, then
through the line 41 to the tube 21 and thereafter to the tube
20 through a connection 42 which corresponds to the line 40.
A valve member is installed into the supply duct of each indi-
vidual tube so that each individual nozzle tube or each group
of nozzle tubes can be supplied separately with pressurized water,
To operate the apparatus the top nozzle tubes 19 and
20 are biased after the lifted door is driven into the cleaning
apparatus which can be in the position illustrated in Figure 1
and the frame is then slowly moved by the lifting device 28 into
the top limiting position. Spraying the pressurized water into
the region situated between the door plug 33 and the sealing edge
31 flushes away the accretions situated thereat. The upper of
the two cylinders 22 is operated when the frame reaches its top
limiting position. The piston rods 23 cause the tubes 18 and 19
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to pivot inwardly to effect cleaning between the top cross-
member of the sealing edge 31.
After shutting off and pivoting back of the nozzle
tubes 18 and 19 the two bottom nozzle tubes 20 and 21 are then
biased and the frame is slowly lowered into its bottom position'
the gap between the sealing edge and the refractory plug is then
cleaned in the bottom half of the door member. On arrival at
the bottom limiting position the lower of the cylinders 22 is
actuate~ and the bottom nozzle tubes 20 and 21 are pivoted in-
wardly so that the region of the bottom cross-member of the
sealing edge is cleaned. The supply of pressurized water to
the tubes 20 and 21 is shut down after the inward pivoting
operation and the tubes 20 and 21 are returned into their
starting position by means of the bottom thrust jacks 22.
Cleaning of the door is thus completed.
A plurality of nozzles each of which is individually
closable can be arranged in uniform distribution on the frame
instead of only one pair of nozzles arranged on both sides of
the apparatus, in which case the dimensions of the frame are
higher than half the door height. The lifting height of the
frame is reduced in this case.
