Claims:We Claim:

1. Burner system for post ignition chamber of sinter plant comprising at least one pair of post ignition burners, each burner comprising of
a horizontal tubular gas supply;
a co-axially disposed horizontal cylindrical combustion air supply around the said gas supply;
operative control means for gas and air flow for desired selective air to gas ratio and /or isolation of gas supply for stopping burner operation.

2. Burner system for post ignition chamber of sinter plant as claimed in claim 1 comprising cooperative respective combustion air nozzle and fuel gas nozzle.
3. Burner system for post ignition chamber of sinter plant as claimed in anyone of claims 1 or 2 adapted for horizontal mounting just after the main ignition chamber of sinter plant.
4. Burner system for post ignition chamber of sinter plant as claimed in anyone of claims 1 to 3 provided to be maintained lighted up during normal sintering process.
5. Burner system for post ignition chamber of sinter plant as claimed in anyone of claims 1 to 4 having capacity for gas calorific value range of 1200 to 4500 Kcal/Nm3.
6. Burner system for post ignition chamber of sinter plant as claimed in anyone of claims 1 to 5 comprising plurality of said post ignition burners mounted horizontally on both the side walls covering the complete sinter bed width.
7. Burner system for post ignition chamber of sinter plant as claimed in anyone of claims 1 to 6 wherein said post ignition burners have a turn down ratio of 1:10 whereby the same are adapted to work even at fuel gas flow rate of 1/10 of its rated capacity.

8. A sintering plant comprising
ignition chamber wherein the top layer of the sinter mix is ignited and as the pallet moves forward air is sucked through wind boxes situated under the pallet providing for a high temperature combustion zone ;
post ignition chamber burner system located immediately after the said main ignition chamber;
said post ignition chamber burner system comprising at least one pair of post ignition burners, each burner having
a horizontal tubular gas supply;
a co-axially disposed horizontal cylindrical combustion air supply around the said gas supply;
operative control means for gas and air flow for desired selective air to gas ratio and /or isolation of gas supply for stopping burner operation.
9. A sintering plant as claimed in claim 8 comprising plurality of said post ignition burners mounted horizontally on both the side walls covering the complete sinter bed width.
10. A sintering plant as claimed in anyone of claims 8 or 9 wherein each said post ignition burners are horizontal mounted just after the main ignition chamber of sinter plant and provided to be maintained lighted up during normal sintering process and have a turn down ratio of 1:10 whereby the same are adapted to work even at fuel gas flow rate of 1/10 of its rated capacity.

Dated this the 15th day of February, 2016
Anjan Sen
Of Anjan Sen & Associates
(Applicants Agent)
, Description:FIELD OF THE INVENTION

The present invention relates to gas fired burner system for post ignition chamber of sintering plant. More particularly, the present invention is directed to provide burners with selective configuration for post ignition chamber of sintering plant suitable for burning mixed gas comprising mixture of coke oven gas and blast furnace gas having calorific value of 1200 to 4500 Kcal/Nm3 for generating stable flame in post ignition chamber. These burners are placed immediately after the main ignition chamber. Post ignition chamber burners according to the present invention are mounted on the side walls on each side to cover the sinter bed width. These are intended to further improve sinter quality.

BACKGROUND OF THE INVENTION

The raw sinter mix is loaded on sinter machine through a feeder onto a moving grate called pallet. The sinter bed passes through ignition chamber, located after raw sinter mix feeding on to the sinter bed. The top surface of the mix is ignited through stationary burners in an ignition chamber. Once the top layer is ignited and as the pallet moves forward, air is sucked through wind boxes situated under the pallet. A high temperature combustion zone is created in the charge-bed due to combustion of solid fuel in the form of coke breeze. Due to forward movement of pallet, the sintering process (zone) travels vertically down.

The present invention relates to the design of a post ignition burner for burning mixed gas, placed immediately after the main ignition chamber in order to improve sinter quality.

OBJECTS OF THE INVENTION

The basic object of the present invention is directed to provide gas fired burner system for post ignition chamber in a sinter plant for improving sinter quality.

A further object of the present invention is directed to provide burner system for post ignition chamber of sinter plant wherein the burners are capable of burning mixed gases having calorific value of 1200 to 4500 Kcal/Nm3 for generating stable flame in post ignition chamber.

A still further object of the present invention is directed to provide burner system for post ignition chamber of sinter plant which are mounted horizontally on the side walls on each side just after the main ignition chamber, intended to further improve sinter quality.

A still further object of the present invention is directed to provide burner system for post ignition chamber of sinter plant which would be kept in lighted-up condition during the normal sintering process for desired improvement of sinter quality.

Another object of the present invention is directed to provide gas fired burners for post ignition chamber of sinter plant which favour easy installation of burners.

Yet another object of the present invention is directed to provide gas fired burners for post ignition chamber of sinter plant having turn down ration of 1: 10.

A still further object of the present invention is directed to provide burners for post ignition chamber of sinter plant which would be capable to control of air flow, gas flow and air to gas ratio.

SUMMARY OF THE INVENTION

The basic aspect of the present invention is directed to burner system for post ignition chamber of sinter plant comprising at least one pair of post ignition burners, each burner comprising of
a horizontal tubular gas supply;
a co-axially disposed horizontal cylindrical combustion air supply around the said gas supply;
operative control means for gas and air flow for desired selective air to gas ratio and /or isolation of gas supply for stopping burner operation.

A further aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant comprising cooperative respective combustion air nozzle and fuel gas nozzle.
A still further aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant adapted for horizontal mounting just after the main ignition chamber of sinter plant.
Another aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant provided to be maintained lighted up during normal sintering process.
Yet another aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant having capacity for gas calorific value range of 1200 to 4500 Kcal/Nm3.
A further aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant comprising plurality of said post ignition burners mounted horizontally on both the side walls covering the complete sinter bed width.
A still further aspect of the present invention is directed to said burner system for post ignition chamber of sinter plant wherein said post ignition burners have a turn down ratio of 1:10 whereby the same are adapted to work even at fuel gas flow rate of 1/10 of its rated capacity.
Yet another aspect of the present invention is directed to a sintering plant comprising
ignition chamber wherein the top layer of the sinter mix is ignited and as the pallet moves forward air is sucked through wind boxes situated under the pallet providing for a high temperature combustion zone ;
post ignition chamber burner system located immediately after the said main ignition chamber;
said post ignition chamber burner system comprising at least one pair of post ignition burners, each burner having
a horizontal tubular gas supply;
a co-axially disposed horizontal cylindrical combustion air supply around the said gas supply;
operative control means for gas and air flow for desired selective air to gas ratio and /or isolation of gas supply for stopping burner operation.

A further aspect of the present invention is directed to said sintering plant comprising plurality of said post ignition burners mounted horizontally on both the side walls covering the complete sinter bed width.
A still further aspect of the present invention is directed to said sintering plant wherein each said post ignition burners are horizontally mounted just after the main ignition chamber of sinter plant and provided to be maintained lighted up during normal sintering process and have a turn down ratio of 1:10 whereby the same are adapted to work even at fuel gas flow rate of 1/10 of its rated capacity.
The objects and advantages of the present invention are described hereunder in greater details with reference to the following accompanying nonlimiting illustrative drawing.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING

Figure 1: is the cross sectional view along length of the post ignition burner according to the present invention showing its different parts.

DETAILED DESCRIPTION OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWING

The present invention relates to burner system for post ignition chamber of sinter plant for burning mixed gas (mixture of coke oven gas and blast furnace gas) having calorific value of 1200 to 4500 Kcal/Nm3 for generating stable flame in post ignition chamber. Post ignition burners are used to improve sinter quality. These burners are placed immediately after the main ignition chamber.

Accompanying Figure 1 shows the cross sectional view along length of the gas fired burner for post ignition chamber of sinter plant according to the present invention illustrating its different components.

Referring to the embodiment of the burner as shown in Figure 1, it can be seen that the burner consists of a horizontal outer tube/pipe(3) with air nozzle(1) for combustion air supply and a concentric inner tube(4) with gas nozzle (2) for supplying of fuel gas. The air and fuel gas is thoroughly mixed and burned at the nozzle to generate flame at required temperature which is utilized for sintering operation.

The gas fired post ignition burner for sinter machines according to the present invention is horizontal mounted comprising of cylindrical central tube with nozzle for fuel gas supply which has a co-axially disposed cylindrical air tube with nozzle for supplying air for combustion which fits around the gas tube. The burner is adapted to control gas and air flow and also maintain desired air to gas ratio. There is provision for isolation of gas supply to burner for stopping burner operation. The burner is configured to burn mixed gas having gas calorific value in the range of 1200 to 4500 Kcal/Nm3.

The post ignition burner is mounted horizontally just after the main ignition chamber and kept in lighted-up condition during the normal sintering process. The burners cover complete sinter bed width as the burners are mounted on both the side walls. The post ignition burners have turn down ratio of 1: 10. That means these burners can work even at fuel gas flow rate of 1/10 of its rated capacity and improves the quality of sinter.