FORM 2 THE PATENT ACT 1970 (39 OF 1970) & The Patent Rules, 2003COMPLETE SPECIFICATION (See Section 10 and Rule 13)
1 TITLE OF THE INVENTION :A SYSTEM FOR CONTROL OF DUST EMISSION FROM DOORS OF NON-RECOVERY COKE OVENS.

2 APPLICANT (S)
Name : JSW Steel Limited.
Nationality : An Indian Company.
Address : Jindal Mansion, 5-A, Dr. G. Deshmukh Marg Mumbai – 400 026 State of Maharastra, India.
3 PREAMBLE TO THE DESCRIPTION COMPLETE

The following specification particularly descibes the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION
The present invention relates to a system for control of dust emission from doors of non-recovery coke oven. Importantly, the above system for control of dust emission from non-recovery coke oven is directed to reduce the levels of dust emission and importantly also maintain the oven doors and all the neighbouring areas clean, facilitating smooth operation of the system. Advantageously, the dust control system of the invention is directed to meet industrial emission norms and provide for environment friendly operation and use of non-recovery coke ovens.
BACKGROUND ART
It is well known that coke making process involves compaction of the coal blend into a cake followed by baking of the cake in the coke oven at a temperature of about 1000 to 1100°C for a duration of 48-60 hours followed by water quenching of the hot cake. In non-recovery ovens the volatile gases evolved are burnt in the oven itself by sending air for combustion. Control of combustion in the ovens is done through primary air windows and secondary air flue. The coking or heat transfer in the non-recovery ovens is vertical that is heating from both top and bottom.
It is also known in the art that non-recovery coke ovens, unlike conventional ovens, work under negative pressure. The coal cake made by vibro-compaction technique is introduced in the oven with the help of a charging car by opening the door of the charging side while the door on the opposite side or the discharging side is kept closed. At this point of time as soon as the charging begins, the negative pressure of the oven drops to its minimum. After completion of the charging process, the charging side door is closed and the negative pressure begins to build up again in the oven. It takes about 6 minutes for the charging process to complete and the negative pressure on the oven to build up to the desired level. During this period, due to the high temperature prevailing in the oven, smoke and dust generated from the coal cake emits from the primary air window on the oven door at the discharge side. The smoke and dust emission from the oven is a concern from the point of view of pollution and environmental control.
It would be clearly apparent from the above that the operation of non-recovery coke oven which usually work under negative pressure ,unlike conventional ovens, thus have serious
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problems in causing environmental pollution due to generation of smoke and dust. Importantly, such dust emission, which as mentioned above continues about 6 minutes is found to affect the desired continuous operation of the oven and further causes pollution in the neighbouring areas which add to the complexities in smooth operation of such non-recovery coke oven system.
Importantly also, considering the present day stringent requirement for industrial emission control as per standard norms, the dust emission from such non-recovery coke ovens is found to affect maintaining the standard industrial emission norms laid down by pollution control board / authority which can lead to violation of the norms prescribed for industrial operation of such non-recovery ovens with related consequences.
OBJECTS OF THE INVENTION
It is thus the basic object of the present invention to provide for a system for control of dust emission from doors of non-recovery coke ovens which is directed to take care of the smoke / dust emission and related problems of environmental pollution in operation of such non-recovery coke oven.
Another object of the present invention is directed to a system for control of dust emission from doors of non-recovery coke ovens, which would be simple and cost effective to obtain.
Yet another object of the present invention is directed to a system for control of dust emission from doors of non-recovery coke ovens which would be adapted for simple and user friendly operation and use and can be readily applied to conventional non-recovery coke ovens having known problems of pollution and environmental hazards.
A further object of the present invention is directed to a system for control of dust emission from doors of non-recovery coke ovens, which would facilitate the operation of non-recovery coke ovens by way of drastically reducing the dust emission period from about 6 minutes to less than about 30 seconds thereby facilitating the operation and productivity in non-recovery coke ovens.
Yet further object of the present invention is directed to a system for control of dust emission from doors of non-recovery coke oven, which would avoid unwanted pollution and
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dust emission and provide for required maintaining of oven doors and all the neighbouring areas clean facilitating smooth operation of the system.
Yet further object of the present invention is directed to a simple device for control of dust emission from doors of non-recovery coke ovens which would be adapted to favour movement in all directions and in the process be user friendly for ready and fast application and use in controlling dust emission from doors of non-recovery coke ovens.
SUMMARY OF THE INVENTION
Thus according to the basic aspect of the present invention there is provided a system for control of dust emission from doors of non-recovery coke ovens comprising:
U shaped pipeline having openings at the two ends thereof;
cooling means provided thereon said U shaped pipeline to maintain it cool;
one said end of the U-shaped pipeline adapted to be introduced into the oven under charging with open oven door and dropping negative pressure while the other end adapted to be introduced into a neighboring oven having a higher negative pressure than said oven under charging such that the suction of emissions through said U-shaped pipeline from said oven under charging to said oven with higher negative pressure take place thereby favouring controlling said dust emission from oven the oven under charging.
According to a preferred aspect of the present invention there is provided a system for control of dust emission from doors of non-recovery coke ovens comprising:
U shaped pipeline having openings at the two ends thereof;
cooling means provided thereon said U shaped pipeline to maintain it cool;
one said end of the U-shaped pipeline adapted to be introduced into the oven under charging with open oven door and dropping negative pressure while the other end adapted to be introduced into a neighboring oven having a higher negative pressure
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than said oven under charging such that the suction of emissions through said U-shaped pipeline from said oven under charging to said oven with higher negative pressure take place thereby favouring controlling said dust emission from oven the oven under charging; and
means to introduce compressed air into said U shaped pipeline to create more suction of dust from the oven.
The above disclosed system for control of dust emission of doors of non-recovery coke ovens is thus a very simple device, which can be effective in the control of dust emission from non-recovery coke ovens.
As apparent from the disclosure the system basically involves a long U-shaped pipe having an end adapted to be inserted into the oven which is under charging while its other end is adapted inserted into a neighbouring oven having higher negative pressure. Preferably, the neighbouring oven can be the oven which is reaching its completion of coking since such an oven has higher negative pressure towards end of coking due to which suction of the emissions from the ovens under charging takes place.
In the above system for control of dust emission from doors of non-recovery coke ovens the source of compressed airline is preferably at pressure of about 3.5 bar pressure which is fed into the pipe adapted to create more suction of dust from the oven.
Preferably the U-shaped pipeline comprises mild steel pipeline with surrounding water cooling jacket to keep it cool.
The neighboring oven having a higher negative pressure used in the above system of control of dust emission comprises preferably the oven which is reaching its completion of cooking and having higher negative pressure.
In accordance with another preferred aspect of the invention the said system for control of dust emission from doors of non-recovery coke ovens is mounted on a trolley which is adapted for movement in all directions.
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The above disclosed system for control of dust emission of doors of non-recovery coke ovens is thus a very simple device involving a long U-shaped pipe having one end adapted to be inserted into the oven which is under charging while its other end is adapted to be inserted into a neighbouring oven having higher negative pressure.
The U-shaped pipe line as above is preferably provided with a water cooling jacket such as to maintain the same cool during its operation and use for controlling the dust emission.
In accordance with the preferred aspect of the system of control of dust emission from doors of non-recovery coke oven of the invention the system further includes provision for a compressed air line at about 3.5 bar pressure to create more suction of dust from the oven. The compressed air thus introduced into the system during its operation for controlling dust emission is adapted to create low pressure at the door and draw all the gases.
Preferably, the U-shaped pipe in the system of the invention is obtained of a U-shaped mild steel pipe provided with the cooling jacket to keep it cool.
In accordance with further aspect of the present invention in order to add features of ready and fast application and user friendly attributes, the system for control of dust emission of the invention is further adapted to be mounted on a trolley having arrangement for movement in all the directions.
The details of the invention, its objects and advantages are explained hereunder in greater details in relation to non-limiting exemplary illustration of the system for control of dust emission from doors of non-recovery coke oven as per following accompanying figure.
BRIEF DESCRIPTION OF ACCOMPANYING FIGURE
Figure 1 illustrates an embodiment of the system for control of dust emission from doors of non-recovery coke ovens in accordance with the present invention.
DETAILED DESCRIPTION OF THE ACCOMPANYING FIGURE
Reference is first invited to accompanying figure 1 which illustrates in sectional view an embodiment of the simple system for control of dust emission from doors of non-recovery coke oven of the present invention.
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As illustrated in figure 1, the system basically comprises a long U-shaped mild steel pipe (SP), one end (SP1) of the steel pipe is adapted for insertion into the oven which is under charging whereby a suction is created at primary air window. The other end (SP2) of the steel pipe is adapted to be inserted into a neighbouring oven where the thus sucked dust/smoke is delivered .Preferably the oven which is reaching its completion of coking is selected as the oven to deliver the sucked smoke/dust. Such a neighbouring oven, which is reaching its completion of coking has higher negative pressure towards end of coking due to which suction of the emission from the oven under charging takes place.
As further illustrated in the said figure, the U-shaped mild steel pipe (SP) is provided with a water cooling jacket (JK) to keep the pipe cool during the control of the dust emission to the pipe.For such purposes the cooling jacket is provided with a cooling water inlet (WI) and a water outlet (WO).
In accordance with the further preferred aspect of the invention the system for control of dust emission is also provided with a compressed air line (AL) for supplying compressed air into the pipe line. Such compressed air line having about 3.5 bar pressure into the pipe line (SP) is provided to create more suction of dust from the oven. Such compressed air creates low pressure at the door and draws all the gases.
In accordance with yet further aspect of the invention the system for control of dust emission in accordance with the invention is advantageously adapted for mounting on a trolley having arrangement for movement in all directions. Such an arrangement facilitates ready and fast application and use of the system for control of dust emission in non-recovery coke oven.
It is found that the above disclosed system for control of dust emission installed with respect to non-recovery coke ovens facilitates drastically reducing the dust emission period from about 6 minutes to less than about 30 seconds. Importantly, such control over dust emission help maintaining the oven doors and all the neighbouring areas clean, facilitating the smooth operation of the system. Importantly also, the system is directed to meet and even surpass the industrial emission norms laid down by pollution control authority and is directed to serve in favouring avoiding environmental pollution and meeting the present date required standards of industrial emission norms.
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WE CLAIM:
1. A system for control of dust emission from doors of non-recovery coke ovens
comprising:
U shaped pipeline having openings at the two ends thereof;
cooling means provided thereon said U shaped pipeline to maintain it cool;
one said end of the U-shaped pipeline adapted to be introduced into the oven under charging with open oven door and dropping negative pressure while the other end adapted to be introduced into a neighboring oven having a higher negative pressure than said oven under charging such that the suction of emissions through said U-shaped pipeline from said oven under charging to said oven with higher negative pressure take place thereby favouring controlling said dust emission from the oven under charging.
2. A system for control of dust emission from doors of non-recovery coke ovens
comprising:
U shaped pipeline having openings at the two ends thereof;
cooling means provided thereon said U shaped pipeline to maintain it cool;
one said end of the U-shaped pipeline adapted to be introduced into the oven under charging with open oven door and dropping negative pressure while the other end adapted to be introduced into a neighboring oven having a higher negative pressure than said oven under charging such that the suction of emissions through said U-shaped pipeline from said oven under charging to said oven with higher negative pressure take place thereby favouring controlling said dust emission from the oven under charging; and
means to introduce compressed air into said U shaped pipeline.
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3. A system for control of dust emission from doors of non-recovery coke ovens as claimed in anyone of claims 1 or 2 wherein there is provided a source of compressed airline at about 3.5 bar pressure into the pipe adapted to create more suction of dust from the oven.
4. A system for control of dust emission from doors of non-recovery coke ovens as claimed in anyone of claims 1 to 3 wherein the compressed air is introduced such as to create low pressure at the door and draw all the gases.
5. A system for control of dust emission from doors of non-recovery coke ovens as claimed in anyone of claims 1 to 4 wherein the U-shaped pipeline comprises mild
steel pipeline with surrounding water cooling jacket to maintain it cool.
6. A system for control of dust emission from doors of non-recovery coke ovens as claimed in anyone of claims 1 to 5 wherein the neighboring oven having a higher negative pressure comprises preferably the oven which is reaching its completion of cooking and having higher negative pressure.
7. A system for control of dust emission from doors of non-recovery coke ovens as claimed in anyone of claims 1 to 6 which is mounted on a trolley which is adapted for movement in all directions.
8. A system for control of dust emission from doors of non-recovery coke ovens substantially as hereindescribed and illustrated with reference to the accompanying figure 1.
Dated this 26th day of December,2006 Anjan Sen
Of Anjan Sen & Associates (Applicants Agent)
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ABSTRACT
A SYSTEM FOR CONTROL OF DUST EMISSION FROM DOORS OF NON-RECOVERY COKE OVENS.
A system for control of dust emission from doors of non-recovery coke oven directed to control of dust emission from non-recovery coke oven. The system basically comprises a long U-shaped mild steel pipe (SP), one end (SP1) of the steel inserted into the oven creating a suction at primary air window. The other end (SP2) of the steel pipe is inserted into a neighbouring oven where the dust/smoke thus sucked is delivered, preferably in the oven which is reaching its completion of coking having higher negative pressure. The U-shaped mild steel pipe (SP) is provided with a water cooling jacket (JK) to keep the pipe cool during the control of the dust emission to the pipe. For such purposes the cooling jacket is provided with a cooling water inlet (WI) and a water outlet (WO). The system is also provided with a compressed air line (AL) for supplying compressed air into the pipe line. Such compressed air line having about 3.5 bar pressure into the pipe line (SP) favoring more suction of dust from the oven.
Figure 1.
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