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IMPROVED METHOD AND DEVICE FOR ROOF CARBON CUTTING FOR
COKE OVEN
FIELD OF INVENTION
This invention relates to improved method and device for roof carbon cutting for coke oven and more particularly to means for roof carbon cutters, which are reliable, restricts any possibility for the damage of the roof of the coke oven plant.
BACKGROUND
Carbon deposition at the rooftop of coke oven poses problems in gas flow, charging operation etc. Removing the same by regular cleaning operation is of utmost importance.
A coke oven is a retort in which coke is produced by the destructive distillation or carbonization of coal. During the coking operation the continuous inspection and cleaning procedure of the coke oven is extremely important by the operating personnel's. Inspection and cleaning of goosenecks and standpipes are required prior to each charge to a specified minimum diameter sufficient to effectively move the evolved gases from the oven to the collector mains. Similarly, the inspection for roof carbon build-up prior to each charge and removal of roof carbon is necessary to provide an adequate gas channel so that the gases are effectively moved from the oven into the collector mains. Roof carbon cutters or a compressed air system or both on the pusher machine rams are used to remove roof carbon in a coke oven.
Carbon builds up on the rooftop, the comers of the roof, and carbon and tar accumulate in the gas channel. These deposits must be cleaned off from the roof: (1) to maintain clearance tolerances in the free space zone so that the gas can flow from one end to other onside the oven; (2) to allow migration of gas produced in the coking process through the gas pipe i.e. accession pipe; (3) to

allow gas migration along the gas pipe to the main header i.e. gas collecting main at the top of the ovens and out of the ovens.
The surfaces to be cleaned are the roof top, the side corners, and the gas channel and these two surfaces are perpendicular to each other.
Earlier, the roof of the coke ovens is cleaned through the use of manual labor. A workman uses a suitable length of rod with a blade on the end to scrape off the carbon and tar. Now the above cleaning is done by a scrapper during pushing operation. Fig 1 shows the design of the existing scrapper.
Existing scrappers are not effective. Moreover, use of these is prone to oven wall damage. Since the existing one is made of a single piece handling of the same is difficult and time consuming during replacement. These Roof carbon cutters or a compressed air system or both on the pusher machine rams are used to remove roof carbon. Due to roof carbon formations thermal regime cannot be effectively controlled
Existing / conventional devices are made of single piece of cast steel heavy block. When cutting fingers are damaged or eroded, whole block has to be replaced.
To minimize the above problems and effective use a design modification is required which can be easily retrofitted in existing pusher machine.
SUMMARY OF THE INVENTION
Accordingly, the present invention discloses an improved device for roof carbon cutting for coke oven comprising of, a rectangular beam for carrying an assembly of cleaner blades mounted on a cylindrical shaft on its outer end. A slotted

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channel for mounting the beam to the pusher ram and cutter wheels assembly for carrying out the cleaning operation.
Such as herein disclosed an improved method for roof carbon cutting for coke oven comprising the steps of ; mounting the device on the pusher ram for the removal of carbon; pushing the ram in the coke oven; automatically cleaning the
corners, surface of the roof, the gas channel and the corners of the gas channel
in one operation utilizing a single force, the relative movement between the coke oven, pusher ram and the cleaning device, to accomplish all cleaning operations on the coke oven roof.
The objects of the present invention are to overcome the objections to and improved roof cleaning apparatus and method which:
a. can be readily mounted on the pusher ram for the removal of carbon;
b. cleans the coke oven roof in about a few seconds;
c. automatically cleans the corners, surfaces of the roof, the gas channel and the corners
of the gas channel in one operation;
d. is simple and rugged in structure and provides long maintenance free
operation life;
e. utilizes segmented cutter blades to satisfactorily clean irregular surfaces on the
coke oven roof caused by thermal cracking of gas and other particle depositions
on the coke oven roof and
f. utilizes a single force, the relative movenrnt between the coke oven pusher
ram and the cleaning device, to accomplish all cleaning operations on the coke oven roof.

It is therefore, an object of this invention to provide a device for use in a coke oven to clean
up the carbon deposits of roof top, the side corners and the carbon accumulated over the
gas channel.

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As per another exemplary embodiment of the present invention there is provided a device having replaceable cutting wheels, which can be easily replaced without removing whole block. Removal of block requires high manpower and other
infrastructural facilities causing the pushing car to remain inoperative for long period.
As per another embodiment of the present invention, the movement of the new device removes roof deposits easily with smooth movement of pusher ram without giving back thrust on the pushing mechanism in contrast to conventional device.
As per another object of the present invention the new device does not damage oven wall and pusher ram due to absence of heavy back thrust given by conventional device.
As per yet another object of the present invention, the new device is a more user friendly for operation and maintenance. In the conventional device, height of the whole body of the existing scrapper beam has to be adjusted frequently to
compensating reduced height of cutting fingers due to erosion and finally have to be replaced the whole device.

These together with other objects of the invention, along with the various features of novelty, which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better
understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter.

6 \BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
FIG. 1 is a front & side view of a coke oven roof scraper as per the prior art;
FIG. 2 is a front & side view of a coke oven roof cutter as per the embodiment of the present invention;
DETAILED DESCRIPTION
The aforesaid objects of this invention and other objects which will become apparent as the description proceeds are achieved by providing an improved oven roof cleaning apparatus for removing deposits of carbon, tar, and the like from a coke oven.
Referring now to the drawings and particularly to FIG. 1, earlier cleaning of the coke ovens are done by cast steel scrappers during pushing operation.
Wheel cutters are tested to be more effective in removing hard roof carbon deposits from the coke oven roof than conventional finger type cutter, which quickly lost sharpness on use.
In the modified design the fixed teeth of the existing scraper were replaced by detachable rotating type cutting wheels, which can be replaced easily as and when required. The details of the modified design for the roof carbon cutter as shown in fig:2. The cutting wheels are replaceable and they cut the carbon deposit during the forward and backward movement of the pusher. Cutting wheels are fixed in such a way that whenever it corner in contact with any solid material can be rotated freely and act as a cutting tool. The whole assembly is adjusted in such a way that most of the deposition can be removed to the extent possible without damaging the wall. The wheels are be made of heat resistant
steel (grade IS 4522Gr. 4, 1986) to withstand the high temperature during the

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cutting operation. The existing is of a single piece material made of heat resistant steel, whereas in the modified one only the cutting will are made-up of heat resistant steel and rest can be made of cost effective material. Removal of the cutting tools is also very easy and less time consuming. The new device is a more user friendly for operation and maintenance. In the conventional device, height of the scrapper beam has to be adjusted frequently for compensating reduced height of cutting fingers due to erosion and finally have to be replaced the whole device.
Presently Durgapur Steel Plants use this new device. This device may be introduced in other plants having slotted type recovery coke ovens effectively.
For the purpose of cleaning the roof and the side corners of the gas channel which is not reachable by the conventional surface means either at the top, bottom, or both sides thereof, a cutter device (FIG. 1) is used. This device has a rectangular beam carrying an assembly of cleaner blades (round cutter) on its outer end, wheel blades are engage able with a corner to be cleaned of the deleterious deposits. These wheels are rotating type and reciprocally mounted on the shaft at the neck of the beam as viewed in (FIG. 2), and at its lower end is mounted to the pusher ram. The cutter wheel is free to move in a rotatory motion and thus have a less impact on the roof surface and prevents it from damaging. The design details of the new cutter are included in the specification.
It will be understood by those skilled in the art that the objects of the present invention have been achieved by providing an improved method and device for the cleaning of roof of coke ovens for removing carbon tar and the like. This device can be readily mounted on an pusher ram which automatically cleans the coke oven roof, side corners, cleans the tapered surfaces on comers, the gas channel in one operation; is simple and rugged in structure and provides a long maintenance-free operational life; not in any way damage the roof or gas channel; utilizes segmented cutter blades for the cutting of the carbon, tar

8 deposits to satisfactorily clean irregular / regular surfaces on the coke oven roof.
Although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof, it has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed. It will be apparent to those having ordinary skill in the art that a number of changes, modifications, variations, or alterations to the invention as described herein may be made, none of which depart from the spirit or scope of the present invention. The particular embodiments and applications were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are sujted to the particular use contemplated. All such changes, modifications, variations, and alterations should therefore be seen as being within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.

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We Claim :
1. An improved device for roof carbon cutting for coke oven comprising of :-
a beam for carrying cleaner blades on its outer end;
mounting means for mounting the rod to the beam; cutter wheels for carrying out the cleaning operation.
2. The device as claimed in claim 1, wherein the wheels are free to rotate
and reciprocally mounted on the rod, the said rod along with the wheel assembly
is inserted in the hole of beam neck and locked by screw.
3. The device as claimed in claim 1, wherein the cutter wheel is free to move
in a rotatory motion and thus have a less impact on the roof surface and prevents
it from damaging.
4. The device as claimed in claim 1, wherein the cutting wheel comprises
blades which are segmented.
5. The device as claimed in claim 1, wherein height of the pusher ram is not
adjusted frequently to compensate reduced height of segmented cutting blade
due to erosion.
6. The device as claimed in claim 1, wherein the wheel cutter is replaceable.
7. The device as claimed in claim 1, wherein a rotating means is for rotating
the blade across the corner while the blade is in contact with the roof and
corners,
8. An improved method for roof carbon cutting for coke oven comprising the
steps of:-
mounting the cutting device on the pusher ram for the removal of carbon; pushing the ram in the coke oven;

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automatically cleaning the corners, surfaces of the roof, the gas channel and the corners of the gas channel in one operation utilizing a single force, the relative movement between the coke oven pusher ram and the cleaning device, to accomplish all cleaning operations on the coke oven roof.
9. The method as claimed in claim 8, wherein the cutting device comprises of
a beam, a rod, spacer and wheel cutting blades.
10. The method as claimed in claim 8, wherein the cutting blades are
segmented.
11. The method as claimed in claim 8, wherein the mounting is done by press
fitting the device to the pusher ram.
12. An improved device for roof carbon cutting for coke oven, substantially as
herein described with particular reference to accompanying drawings.
13. An improved method for roof carbon cutting for coke oven, substantially as
herein described with particular reference to accompanying drawings.

The present invention relates to an improved device for roof carbon cutting for coke oven comprising of a beam for carrying cleaner blades on its outer end; mounting means for mounting the rod to the beam; cutter wheels for carrying out the cleaning operation and an improved method for roof carbon cutting for coke oven comprising the steps of mounting the cutting device on the pusher ram for the removal of carbon; pushing the ram in the coke oven; automatically cleaning the comers, surfaces of the roof, the gas channel and the corners of the gas channel in one operation utilizing a single force, the relative movement between the coke oven pusher ram and the cleaning device, to accomplish all cleaning operations on the coke oven roof.