Claims:We Claim:

1. A system for heating coke oven battery comprising:

plurality of ovens each said oven sandwiched between pair of heating walls;
each said heating walls having plurality of vertical ducts/flues for movement of fuel gas and air for combustion and heat generation for the ovens or product of combustion selectively ; wherein

the end vertical ducts/flues which are subject to comparatively more heat loss due to radiation , exposure to atmosphere during oven opening & closing operations is supplied with additional coke oven gas (COG) as said flue gas while all intermediate vertical ducts/flues therebetween the end vertical ducts/flues are provided with blast furnace gas (BFG)

said end vertical ducts/flues alongwith the said intermediate vertical ducts/flues therebetween the end vertical ducts/flues all synchronized with normal heating reversing system involving in one reversal odd no. of the vertical flues are under heating by passage of said fuel gas and air therethrough and even no. of the vertical flues for passage of product of combustion which is reversed in the next reversal and continued likewise.

2. A system as claimed in claim 1comprising
Heating walls consisting of even number of verticals/ flues interconnected connected at the top in pairs wherein flue gases after combustion goes up in the flue duct and comes down through the interconnection at the top with the pair flue, then passes through vertical inclined flue to the regenerators ( on heating cycle) and escapes out through bus flue opening to Waste Gas tunnel to Chimney which develops natural draft characterized by
end verticals/flues of heating walls on pusher side and coke side connected to coke oven gas supply source through a separate header connection from the Coke Oven Gas(COG) main and all other flues/verticals of all heating walls are connected to blast furnace gas(BFG) main supply header;
said coke oven gas connection header comprising four numbers of branch lines in which both isolation cocks and reversing cocks are installed; and wherein four numbers of reversing cocks are located in line with the BFG reversing loop and another four numbers of reversing cocks are installed in line with the COG reversing loop such that the header supplying gas to end flues of odd heating walls will be ON when corresponding flues burn in the general reversing system and the other header supply will be OFF and vice versa, synchronizing with the general reversal pattern of the corresponding flues burning.

3. A system as claimed in anyone of claims 1 or 2 wherein said header connection from the Coke Oven Gas(COG) main comprising DN 250 pipe line and said four branch lines comprising DN 80 pipe lines.

4. A system as claimed in anyone of claims 1 to 3 wherein from each set of said four reversing cocks, two lines of DN 80 pipe are routed in the pusher side and other two in the coke side so that out of the two lines going to pusher and coke side, one header is connected to end flues of odd heating wall and another header connected to end flues of even heating walls.

5. A system as claimed anyone of claims 1 to 4 wherein COG supply to end flues are controlled by installation of varying diameter nozzles in the end flues connection arrangement so that required temperature can be maintained through these control nozzles.

6. A system as claimed anyone of claims 1 to 5 wherein only one reversing loop i.e. either the BFG reversing loop or COG reversing loop only will be in operation at a time.

7. A system as claimed anyone of claims 1 to 6 wherein four reversing cocks are installed each in COG and BFG reversing loop with necessary interconnection and isolation arrangements to facilitate easy changeover of heating medium from BFG to COG and vice versa.

8. A system as claimed anyone of claims 1 to 7 wherein said four headers connected to COG and BFG reversing loops are interconnected through isolation cocks arrangement.

9. A system as claimed anyone of claims 1 to 8 wherein whenever the heating medium to be changed over to COG or BFG, only the corresponding inter-connecting valves are to be opened or closed according to supply of the COG to the flues favouring easy changeover of heating medium.

10. A method for maintaining uniform scheduled temperature of heating walls of coke oven using the system as claimed in anyone of claims 1 to 9 comprising
heating end vertical/flues with additional rich Coke oven gas while the rest of the coke oven battery is on lean Blast Furnace gas heating;
connecting headers to the corresponding flues synchronizing with the reversal of burning and non burning flues of Blast Furnace Gas heating system;
changing over of heating medium from BOG to COG or vice versa as required for heating the whole battery by interconnecting respective reversing loops through isolation cocks arrangement.

11. A method as claimed in claim 10 wherein heating end flues with rich Coke oven gas comprising supplying COG through separate gas headers, involving reversing cocks, end flue connections from the existing coke oven gas supply main.
12. A method as claimed in anyone of claims 10 or 11 comprising controlling End Vertical Temperatures on both pusher and coke side as per the requirement of minimum 1100 °C implemented through control nozzles of appropriate diameter.
13. A method as claimed in anyone of claims 10 to 12 comprising operating reversing cocks of the respective headers to supply COG to any one of the headers on pusher or coke side synchronising with the battery reversing cycle.
14. A method as claimed in anyone of claims 10 to 13 comprising burning odd flues of odd number Heating walls and even flues of even numbered Heating walls in one reversal and passing the product of combustion through even flues of odd numbered heating walls and odd flues of even numbered Heating walls, while burning even flues in the odd numbered heating walls and odd flues in even numbered heating walls in the next reversal, and passing the product of combustion through the other flues.
15. A method as claimed in anyone of claims 10 to 14 wherein said odd and even flue burning reversal cycle repeats every 20 to 30 minutes.

Dated this the 16th day of December, 2016
Anjan Sen
Of Anjan Sen & Associates
(Applicants Agent)

, Description:FIELD OF THE INVENTION

The present invention relates to a system and method of heating coke oven battery involving heating of End Vertical/flues with additional coke oven gas to attain desired End Vertical/flues Temperature (EVT) on both pusher and coke side and remaining flues of all heating walls with blast furnace gas. More particularly, the present invention is directed to provide a scheme of heating coke oven battery wherein to maintain scheduled temperatures in the end flues at minimum 1100°C, the end flue/verticals of all heating walls are heated with rich coke oven gas having higher calorific value while heating the whole coke oven battery is heated with lean Blast Furnace gas/Mixed gas.

BACKGROUND OF THE INVENTION
The coke oven process is conventionally known to be a coal carbonisation process ( Heating of coal in absence of air). Since the process is endothermic, it is carried out at elevated temperature above 1200 °C. The coke oven is constructed of silica refractory bricks and the operating temperature is in the range of 1250 to 1320 °C. The brickwork temperature is maintained using gaseous fuels like Coke Oven Gas (COG) or Blast Furnace Gas (BFG)/Mixed Gas ( COG+ BFG Mixure)
The constructional details are as follows:
The coke oven battery construction is broadly classified in to in five zones as below: ( Refer Figure 1)
1. Bus Flue zone
2. Regenerator Zone
3. Inclined Flue Zone
4. Heating walls
5. Oven Roofing
The ovens are sandwiched between two heating walls. For each oven, charged with coal cake, heating is done from both the side heating walls.
In case of applicant’s coke oven plant at JSW, Dolvi Works, there are 32 verticals/ flues in each Heating walls, there are 56 Heating walls for 55 nos of ovens. In the above configuration there are two batteries consisting of 2x 55 = 110 ovens.
Out of the 32 verticals/ flues (which are in 16 interconnected pairs), flue nos 1 and 32 are the end flues/ verticals as they are situated at the end of the Heating Walls. The heat loss in the end flues are more than the inside flues as the end flues are subjected to more radiation heat losses.
In the heating process, air drawn from atmosphere is preheated in the regenerators ( on cooling cycle ) filled with Checker bricks and passes through inclined zone to the heating wall bottom where fuel gas and air comes into contact at elevated temperature resulting in combustion. The product of combustion moves up along the heating walls vertical ducts called flues/ verticals. The Heating walls consists of even nos of verticals/ flues (Varies between 28 to 32 nos based on the design). The verticals are interconnected at the top in pairs ( say 1&2, 3&4, ….etc). The flue gases after combustion goes up in the flue duct and comes down through the interconnection at the top with the pair flue, then passes down through vertical ducts then to inclined flue to the regenerators ( on heating cycle) and escapes out through bus flue opening to Waste Gas tunnel to Chimney which develops natural draft. A typical schematic sectional view of coke oven indicating above features is shown in accompanying figure 1. The cycle of heating and cooling is repeated every 20 to 30 minutes by changing the bus flue/ regenerators and interconnected flues in the Heating walls, which is called Reversing system.
As explained above, in a Heating Wall, in one reversal odd no of flues ( nos 1,3 , 5, ….) will be under heating and through the interconnected even no flues ( nos 2,4,6,…) the product of combustion comes down. In the adjacent Heating Walls it will be reverse ie Even nos under heating and odd nos discharging the product of combustion. In the next reversal after 20 to 30 minutes, it will be reverse of above.
The whole coke oven battery / heating walls are either heated with coke oven gas or with Blast Furnace gas. While heating a coke oven battery with Blast Furnace gas (Lean gas), the End Vertical/flues Temperature (EVT) on both pusher and coke side remains on lower side than the desired temperature. It is always a challenge to the coke oven operators to maintain scheduled temperatures in the end flues while heating the coke oven battery with Blast Furnace gas/Mixed gas. Whenever a coke oven battery is getting heated with lean Blast Furnace Gas (BFG), the temperature of end flues on both pusher and coke side remains low due to various factors like insufficient gas flow, regenerator burning due to air ingress from face wall of the regenerator, gas burning at bus flue due to air ingress etc. In the conventional design of coke oven, provision is made either to heat the entire battery either with coke oven gas or BF/Mixed gas. There are some designs in which, in one battery, some heating walls on Coke oven gas firing and some on BFG/Mixed Gas firing exists. Generally in an integrated steel plant, heating with only higher CV COGis uneconomical as it results in flaring of excess lower CV BFG in the plant.
When a coke oven battery is heated with BFG/Mixed Gas(MG), the end flues are vulnerable for drop in temperature due to following reasons:
• The distribution of gas to individual flues cannot be controlled very preciously as in case of COG heating;
• The air ingress through the end regenerator face walls, bus flue joints etc results in burning of some gases in regenerator itself with the available oxygen, starving the end vertical flues;
It is always a challenge for coke oven operators to maintain End Vertical/flue Temperature (EVT) to the desired value, while heating with BFG/Mixed Gas. In applicants coke oven plant, the problem was very acute. This is attributable to issues related to port holes jamming, heavy air ingress through bus flues and regenerator flues, burning of gases at bus flue/ regenerator level etc due to some deviations in civil & equipment during the coke oven erection stage. These deviations cannot be rectified in the operating coke oven battery.
Various conventional options of increasing the end flue temperature like sealing of bus flue brick joints, regenerator face walls dismantling and re-lining etc were contemplated, but the result was only marginal increase up to 850 °C from < 800°C. There was a huge gap between requirement and achievement due to the inherent defects as mentioned above.
The end flue temperatures could not be raised beyond 850 °C against the requirement of minimum 1100 °C. This resulted in under coking of end portion, causing huge emissions during pushing operation. There was threat of plant closure due to this emission. The production was reduced by increasing the coking cycle.

The adverse effects on low EVT in a coke oven battery are:
– Green Pushing ( Not fully coked)
– Emissions during pushing
– Deterioration of coke quality
– Premature failure of end silica bricks.

There has been thus a continuing need in the related field to develop a system and method for heating of vertical/flues through the walls of the coke oven battery which would ensure attaining uniform temperature of all heating walls as per the requirement of coking cycle, including achieving desired temperature of end verticals/flues when using BF lean gas for purpose of heating the entire coke oven battery to favour improved coke quality and productivity with reduced emission.

OBJECTS OF THE INVENTION
The basic object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein all the heating walls of all ovens are heated with blast furnace lean gas while the end verticals/flues on both pusher and coke side of all heating walls are additionally heated with rich coke oven gas to maintain the desired end vertical temperature(EVT).
A further object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein the required temperature of end verticals is maintained at a level of minimum 1100°C for desired coke quality and reduced emission.
A still further object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein end verticals of all heating walls will be heated through additional supply of coke oven gas while the entire coke oven is heated with lean BF gas, involving separate heating system comprising of gas headers, reversing cocks, end flue connections etc from the existing coke oven gas supply main.
Another object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein connections are so designed as to supplement the burning and non burning flues, synchronizing with the normal heating reversing system.
Yet another object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein regulation mechanism to maintain End Vertical Temperatures as per the requirement, is implemented through control nozzles.

A still further object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein easy changeover of heating media would be possible whenever the whole battery is required to be changed over back to coke oven gas heating.
A still further object of the present invention is directed to provide a system and method for heating of coke oven heating walls wherein problem related to distribution of gas evenly among the Heating walls is resolved by providing regulating system through orifices.

SUMMARY OF THE INVENTION
The basic aspect of the present invention is directed to a system for heating coke oven battery comprising:

plurality of ovens each said oven sandwiched between pair of heating walls;
each said heating walls having plurality of vertical ducts/flues for movement of fuel gas and air for combustion and heat generation for the ovens or product of combustion selectively ; wherein

the end vertical ducts/flues which are subject to comparatively more heat loss due to radiation , exposure to atmosphere during oven opening & closing operations is supplied additional coke oven gas (COG) as said fuel gas, while rest of the vertical ducts/flues there are provided with blast furnace gas (BFG)

said end vertical ducts/flues alongwith the said intermediate vertical ducts/flues therebetween the end vertical ducts/flues all synchronized with normal heating reversing system involving in one reversal odd no. of the vertical flues are under heating by passage of said fuel gas and air therethrough and even no. of the vertical flues for passage of product of combustion which is reversed in the next reversal and continued likewise.

A further aspect of the present invention is directed to said system comprising
heating walls consisting of even number of verticals/ flues interconnected at the top in pairs wherein flue gases after combustion goes up in the flue duct and comes down through the interconnection at the top with the pair flue, then passes through inclined flue to the regenerators ( on heating cycle) and escapes out through bus flue opening to Waste Gas tunnel to Chimney which develops natural draft wherein
end verticals/flues of heating walls on pusher side and coke side connected to coke oven gas supply source through a separate header connection from the Coke Oven Gas(COG) main and all other flues/verticals of all heating walls are connected to blast furnace gas(BFG) main supply header;
said coke oven gas connection header comprising four numbers of branch lines in which both isolation cocks and reversing cocks are installed; and wherein four numbers of reversing cocks are located in line with the BFG reversing loop and another four numbers of reversing cocks are installed in line with the COG reversing loop to facilitate flues burning even if it is required to be changed over to COG underfiring, such that the header supplying gas to end flues of odd heating walls will be ON when corresponding flues burn in the general reversing system and the other header supply will be OFF and vice versa, synchronizing with the general reversal pattern of the corresponding flues burning.

A still further aspect of the present invention is directed to said system wherein said header connection from the Coke Oven Gas(COG) main comprising DN 250 pipe line and said four branch lines comprising DN 80 pipe lines.

A still further aspect of the present invention is directed to said system wherein from each set of said four reversing cocks, two lines of DN 80 pipe are routed in the pusher side and other two in the coke side so that out of the two lines going to pusher and coke side, one header is connected to end flues of odd heating wall and another header connected to end flues of even heating walls.

A still further aspect of the present invention is directed to said system wherein COG supply to end flues are controlled by installation of varying diameter nozzles in the end flues connection arrangement so that required temperature can be maintained through these control nozzles.

Yet another aspect of the present invention is directed to said system wherein four reversing cocks are installed each in COG and BFG reversing loop to facilitate easy changeover of heating medium from BFG to COG and vice versa.

A further aspect of the present invention is directed to said system wherein said four headers connected to COG and BFG reversing loops are interconnected through isolation cocks arrangement.

A still further aspect of the present invention is directed to said system wherein whenever the heating medium to be changed over to COG or BFG, only the corresponding inter-connecting valves are to be opened or closed according to supply of the COG to the flues facilitating easy changeover of heating medium.

A further aspect of the present invention is directed to said A method for maintaining uniform scheduled temperature of heating walls of coke oven using the system as described above comprising
heating end vertical/flues with additional rich Coke oven gas while the whole coke oven battery is on lean Blast Furnace gas heating;
connecting headers to the corresponding flues synchronizing with the reversal of burning and non burning flues of Blast Furnace Gas heating system;
changing over of heating medium from BOG to COG or vice versa as required for heating the whole battery by interconnecting respective reversing loops through isolation cocks arrangement.

A still further aspect of the present invention is directed to said method wherein heating end flues with rich Coke oven gas comprising supplying COG through separate gas headers, involving reversing cocks, end flue connections from the existing coke oven gas supply main.

A still further aspect of the present invention is directed to said method comprising controlling End Vertical Temperatures on both pusher and coke side as per the requirement of minimum 1100 °C implemented through control nozzles of appropriate diameter.

A still further aspect of the present invention is directed to said method comprising operating reversing cocks of the respective headers to supply COG to corresponding headers on pusher or coke side synchronising with the battery reversing cycle.

Another aspect of the present invention is directed to said method comprising burning odd flues of odd number Heating walls and even flues of even numbered Heating walls in one reversal and passing the product of combustion through even flues of odd numbered heating walls and odd flues of even numbered Heating walls, while burning even flues in the odd numbered heating walls and odd flues in even numbered heating walls in the next reversal, and passing the product of combustion through the other flues.

Yet another aspect of the present invention is directed to said method wherein said odd and even flue burning reversal cycle repeats every 20 to 30 minutes.

The above and other objects and advantages of the present invention are described hereunder in greater details with reference to the following accompanying non limiting illustrative drawings.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1: is the schematic diagram showing sectional view of the coke oven battery walls illustrating the coke oven battery brickwork cross section and position of verticals/flues, bus flue, inclined flue etc.
Figure 2: is the schematic diagram showing the scheme of coke oven battery heating walls, flue and ovens indicating the position of end flues(1, 32) at pusher and coke side on each wall.
Figure 3: is the schematic flow diagram illustrating the supply lines from headers, interconnections, valves etc for supply of COG to end verticals/flues and BF gas to all other flues of heating walls and the reversing loop for BF gas and COG according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS
The present invention is directed to provide a system for heating of coke oven heating walls wherein all the heating walls of all ovens are heated with blast furnace lean gas except the end verticals/flues on both pusher and coke side of all heating walls which are heated with rich coke oven gas to maintain the desired end vertical temperature(EVT) is maintained at a level of minimum 1100C and a method of implementing the same for desired coke quality with improved productivity and reduced emission.
As already explained, that the coke oven plant conventionally have series of heating walls in a battery with each oven located in between a pair of walls and each heating wall having a number of verticals or flues positioned within the wall brick work as shown in the accompanying Figure 1. In the conventional coke oven design, the entire coke oven is heated with Coke oven Gas or with BF gas. Means all the Heating walls and all the verticals/ flues heated either with COG or BFG. Following features can be identified in Figure 1 and marked with references as follows:
A-Air line
B-BF Gas line
C- Waste Gas line
D-Bus Flue
E-Coke Oven(CO) Gas line
F-Regenerator
G-Inclined Flue
H-Oven Top

The Heating walls consists of even nos of verticals/ flues (Varies between 28 to 32 nos based on the design). The verticals are interconnected at the top in pairs ( say 1&2, 3&4, ….etc). The flue gases after combustion goes up in the flue duct and comes down through the interconnection at the top with the pair flue, then passes through pair vertical, inclined flue to the regenerators ( on heating cycle) and escapes out through bus flue opening to Waste Gas tunnel to Chimney which develops natural draft. A typical schematic sectional view of coke oven indicating above features is shown in accompanying figure 1. The cycle of heating and cooling is repeated every 20 to 30 minutes by changing the bus flue/ regenerators and interconnected flues in the Heating walls, which is called Reversing system. The above reversals take place through an elaborate automatically controlled Reversing Mechanism. This is conventional system. There will be reversing loops moved by electrical or hydraulic drives. The loops are connected with all reversing valves of the entire battery. There is separate loops for COG reversing cocks & BFG valves operation.
Out of the 32 verticals/ flues (which are in 16 interconnected pairs), flue nos 1 and 32 are the end flues/ verticals as they are situated at the end of the Heating Walls. The heat loss in the end flues are more than the inside flues as the end flues are subjected to more radiation heat losses. Accompanying Figure 2 illustrates the schematic diagram showing the scheme of coke oven battery heating walls, flue and ovens indicating the position of end flues(1, 32) at pusher and coke side on each wall.
In the configuration and working scheme as explained above, the Heating walls and the verticals/ flues of heating walls make up the coke oven battery. All the above are of silica refractory construction. Theoretically all the flues and in turn the heating walls are to be in uniform temperature. The end verticals/flues are subjected to more heat loss due to radiation, exposure to atmosphere during ovens opening & closing operations. Further through the minor gaps developed in regenerators face walls and the bus flue opening gaps developed during operation, air ingresses inside the brickwork gaps, affecting the heating process in the end flues. As a result of above affects the End verticals/ flues temperature drops beyond the permissible limit at times. It is always a challenge for the coke oven operators to maintain the End flues temperature as per the requirement.

In order to solve the above problem of the existing coke oven operation, a system and method of heating of coke oven is implemented by way of the present invention wherein all the heating walls of all ovens are heated with blast furnace lean gas except the end verticals/flues on both pusher and coke side of all heating walls which are additionally heated with rich coke oven gas to maintain the desired end vertical temperature(EVT) at a level of minimum 1100°C for desired coke quality with improved productivity and reduced emission.
In some existing design, partial battery is heated with COG and rest with BFG. It means some particular heating walls will be heated with COG and rest heating walls will be heated with BFG. Which means all the flues of the particular Heating walls will be either on COG or BFG.
But according to the scheme of the present invention, when the entire battery is on BFG heating, only the end verticals / flues of all the Heating walls are being additionally heated with Coke oven gas to increase the end verticals/ flues temperature to the desired 1100 °C plus. Hence, this is a unique design.
To achieve this a separate heating system comprising of gas headers, reversing cocks, end flue connections etc from the existing coke oven gas supply main have been implemented. The connections are so designed to supplement the burning and non burning flues, synchronizing with the normal heating reversing system. The design envisages regulation mechanism to maintain End Vertical Temperatures as per the requirement, through control nozzles. The additional design features facilitate easy changeover of heating media whenever the whole battery is required to be changed over back to coke oven gas heating.

Accompanying Figure 3 shows schematically a flow diagram illustrating the supply lines from headers, interconnections, valves etc for supply of COG to end verticals/flues and BF gas to all other flues of heating walls and the reversing loop for BF gas and COG according to the present invention. Following features of the system can be identified with respective reference number marked as follows:
(1)-New COG Header
(1’)-New COG Header for BF
(2)-Existing COG Line
(3)-Branch lines for COG
(3’)-Branch lines for BFG
(4)-Isolation cock
(5)-Reversing cock for CO
(5’)-Reversing cock for BF
(6)- BFG Reversing loop
(7)-COG Reversing loop
(8)-Odd heating wall end flue
(9)-Even heating wall end flue

In order to supply COG to the end flues, a separate header connection(1) was taken through DN 250 pipe from the existing Coke Oven Gas main(2). These headers are the new COG supply sources to end flues. In these headers, four numbers of branch lines(3,3’) of DN 80 in which both isolation cocks(4) and reversing cocks(5,5’) are installed. Four numbers of reversing cocks(5) are located in line with the BFG reversing loop(6) and another four numbers of reversing cocks(5’) are installed in line with the COG reversing loop(7). From each set of four reversing cocks(5,5’) two lines(3,3’) of DN 80 pipe are routed in the pusher side and other two(3,3’) in the coke side. Out of the two lines going to Pusher and coke side, one header(8) is connected to odd heating wall end flues and another header(9) connected to end flues of even heating walls.
The reversing cocks(5,5’) are connected with the system in such a way that the header supplying gas to end flues of odd heating walls will be ON when corresponding flues burn in the general reversing system and the other header supply will be OFF and vice versa synchronizing with the general reversal pattern of the corresponding flues burning.
The additional COG supply to end flues are controlled by installation of varying diameter nozzles, say 8mm/ 10mm/12mm etc dia., in the end flues connection arrangement. The gas to each connection is regulated by installing required size nozzles in the flue connections. Thus the required temperature can be maintained through these control nozzles.
At a time only one reversing loop i.e. either the BFG reversing loop or COG reversing loop only will be in operation. There are four reversing cocks installed each in COG and BFG reversing loop to facilitate easy changeover of heating medium from BFG to COG and vice versa. The four headers connected to COG & BFG reversing loops are interconnected through isolation cocks arrangement. Whenever the heating medium to be changed over to COG or BFG, only the corresponding inter-connecting valves are to be opened or closed according to supply of the COG to the flues. Thus the changeover of heating medium becomes easy, whenever required.

It is thus possible by way of the present invention to provide a system for heating of coke oven battery wherein the end vertical/flues on pusher and coke side are heated with coke oven gas while all the flues of all heating walls are heated with blast furnace gas and a cost effective and eco-friendly method involving controlled burning of fuel gases to attain desired temperature of heating walls including the end verticals/flues to ensure complete carbonization of coal to coke of desired quality with improved productivity while also minimizing the emission levels.