Blast furnace gas access spray gun mechanism of sintering flue gas deep purification device

Abstract

The utility model discloses a blast furnace gas access spray gun mechanism of a sintering flue gas deep purification device, and solves the problem of how to realize safe operation of a gas access spray gun when blast furnace gas is accessed into a boiler. A spray gun access port (2) is arranged on the boiler membrane wall (1), a coal gas access spray gun (3) is connected onto the spray gun access port (2), the coal gas access spray gun (3) consists of a coal gas access pipe (7) and a sleeve (8), the coal gas access pipe (7) is arranged in the sleeve (8), an annular ventilating duct (10) is arranged between the coal gas access pipe (7) and the sleeve (8), and an outlet of the coal gas access pipe (7) and an outlet of the annular ventilating duct (10) are communicated with each other. The spray guns are arranged in the spray gun access port (2); a cold air inlet (11) is formed in the side wall of the upper end of the sleeve (8), a cooling air pipe (4) is connected to the cold air inlet (11), and the other end of the cooling air pipe (4) is communicated with a boiler secondary air duct (6).

Description

Technical Field

[0001] The utility model relates to a sintering fume multi-pollutant collaborative purification device for purifying sintering fume, in particular to a blast furnace gas access spray gun mechanism of a sintering fume deep purification device. Background Art

[0002] Existing circulating fluidized bed boilers are generally divided into steam boilers and hot water boilers. The fuel of circulating fluidized bed boilers is coal or other fuels with calorific value. The combustion air in the boiler is generally air, and the oxygen content in the air is about 21%. The flue gas generated in the furnace is discharged through the furnace, separator and tail flue in turn. The medium of the boiler is heat-exchanged with the high-temperature flue gas in the boiler through the economizer, water cooling system and superheater to form high-quality steam or hot water. In the ironmaking plant, the iron ore is first crushed into iron ore powder, mixed evenly with coke, limestone powder, etc., and then fired in a sintering machine for hot agglomeration and then used for subsequent ironmaking. In this process, the sintering machine will generate a large amount of sintering flue gas, which contains CO, SO 2 、NO x Toxic and harmful gases such as HCl and dioxins. The traditional process for treating these harmful gases is to add environmental protection equipment, which has the disadvantages of large equipment investment, high use and maintenance costs, and limited elimination of harmful gases. In view of the above situation, the prior art has adopted a technology for treating sintering flue gas with a circulating fluidized bed boiler. This special circulating fluidized bed boiler is also called a sintering flue gas multi-pollutant coordinated purification device. The main principle of the sintering flue gas multi-pollutant coordinated purification device is to replace the air with the sintering flue gas generated in the sintering machine as the combustion-supporting air of the circulating fluidized bed boiler, and through the high temperature environment in the furnace of the circulating fluidized bed boiler and the unique environmental protection advantages of the circulating fluidized bed boiler, the harmful gases in the sintering flue gas are burned and removed, and the steam or hot water generated by the circulating fluidized bed boiler is supplied to other processes in the iron and steel plant, achieving the effect of killing two birds with one stone.

[0003] The deep purification device for sintering flue gas in steel plants is developed based on the treatment of sintering flue gas and other waste gases. The deep purification device for sintering flue gas uses blast furnace gas for ignition, and the blast furnace gas is removed after ignition; but blast furnace gas is a by-product of steel plants, and most companies generally directly use torches to burn the generated blast furnace gas. This treatment method pollutes the environment and wastes the calorific value of the blast furnace gas. If the blast furnace gas is connected to the deep purification device for sintering flue gas, the calorific value therein can be effectively utilized, but because the combustion temperature in the furnace is as high as thousands of degrees, how to make the gas connection spray gun operate safely has become a problem that needs to be solved. Summary of the invention

[0004] The utility model provides a blast furnace gas access spray gun mechanism for a sintering fume deep purification device, which solves the technical problem of how to achieve safe operation of the gas access spray gun when the blast furnace gas is accessed to a boiler.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A blast furnace gas access spray gun mechanism of a sintering flue gas deep purification device comprises a boiler membrane wall, a gas access spray gun, a boiler secondary air duct and a blast furnace gas delivery pipe, a spray gun access port is arranged on the boiler membrane wall, the inner side of the spray gun access port is a furnace dense phase zone, a gas access spray gun is connected to the spray gun access port, the gas access spray gun is composed of a gas access pipe and a sleeve, the gas access pipe is arranged in the sleeve, an annular ventilation duct is arranged between the gas access pipe and the sleeve, the outlet of the gas access pipe and the outlet of the annular ventilation duct are both arranged in the spray gun access port; a cold air access port is arranged on the upper end side wall of the sleeve, a cooling air duct is connected to the cold air access port, the other end of the cooling air duct is connected to the boiler secondary air duct, and the input end of the gas access pipe is connected to the blast furnace gas delivery pipe.

[0007] An annular sealing plate is arranged between the sleeve outside the cold air inlet and the gas inlet pipe; an expansion joint is arranged on the cooling air duct.

[0008] The utility model is based on a sintering fume deep purification device, which sprays blast furnace gas into a furnace at a dense phase zone of the furnace, ignites the blast furnace gas by utilizing the high temperature in the furnace, and fully utilizes the heat of the blast furnace gas. At the same time, the secondary air cooling source of the purification device itself is utilized to cool the spray gun, thereby preventing the spray gun from being deformed and damaged due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a structural schematic diagram of the gas access spray gun 3 of the utility model;

[0011] Figure 3 yes Figure 2 AA section view in. DETAILED DESCRIPTION

[0012] The utility model is described in detail below with reference to the accompanying drawings:

[0013] A blast furnace gas access spray gun mechanism for a sintering flue gas deep purification device comprises a boiler membrane wall 1, a gas access spray gun 3, a boiler secondary air duct 6 and a blast furnace gas delivery pipe. The boiler secondary air duct 6 is inherent to the sintering flue gas deep purification device, i.e., a circulating fluidized bed. The blast furnace gas delivery pipe is connected to the blast furnace gas collecting bin of the ironmaking plant. A spray gun access port 2 is arranged on the boiler membrane wall 1. The inner side of the spray gun access port 2 is a furnace dense phase zone to ensure that the blast furnace gas entering the furnace through the gas access spray gun 3 is fully burned. A gas access spray gun 3 is connected to the spray gun access port 2. The gas access spray gun 3 is composed of a gas access pipe 7 and a sleeve 8. The gas access pipe 7 is provided with a gas access nozzle 2. The gas access nozzle 3 is provided with a gas access nozzle 3. The gas access nozzle 3 is provided with a gas access nozzle 3. The gas access nozzle 3 is provided with a gas access nozzle 7. The gas access nozzle 3 is provided with a gas access nozzle 7. The gas access nozzle 3 is provided with a gas access nozzle 7. The gas access nozzle 7 ... It is placed in the sleeve 8, and an annular ventilation duct 10 is arranged between the gas inlet pipe 7 and the sleeve 8. The outlet of the gas inlet pipe 7 and the outlet of the annular ventilation duct 10 are both arranged in the spray gun access port 2; a cold air inlet 11 is arranged on the upper end side wall of the sleeve 8, and a cooling air duct 4 is connected to the cold air inlet 11. The other end of the cooling air duct 4 is connected to the boiler secondary air duct 6, and the input end of the gas inlet pipe 7 is connected to the blast furnace gas delivery pipe; the cold air from the boiler secondary air duct 6 enters the furnace through the annular ventilation duct 10, which plays a role in cooling the gas inlet spray gun 3, and at the same time can prevent the flame in the furnace from flashing back to the gas inlet spray gun 3.

[0014] An annular sealing plate 9 is arranged between the sleeve 8 outside the cold air inlet 11 and the gas inlet pipe 7 to ensure that the cold air from the boiler secondary air duct 6 is blown toward the furnace; an expansion joint 5 is arranged on the cooling air duct 4 to absorb the expansion of the gas inlet spray gun 3 due to heat.

Claims

1. A blast furnace gas access spray gun mechanism for a sintering flue gas deep purification device, comprising a boiler membrane wall (1), a gas access spray gun (3), a boiler secondary air duct (6) and a blast furnace gas delivery pipe, characterized in that: A spray gun access port (2) is provided on the boiler membrane wall (1), the inner side of the spray gun access port (2) is a furnace dense phase zone, a gas access spray gun (3) is connected to the spray gun access port (2), the gas access spray gun (3) is composed of a gas access pipe (7) and a casing (8), the gas access pipe (7) is arranged in the casing (8), an annular ventilation duct (10) is arranged between the gas access pipe (7) and the casing (8), the outlet of the gas access pipe (7) and the outlet of the annular ventilation duct (10) are both arranged in the spray gun access port (2); a cold air access port (11) is provided on the upper end side wall of the casing (8), the cold air access port (11) is connected to a cooling air duct (4), the other end of the cooling air duct (4) is connected to the boiler secondary air duct (6), and the input end of the gas access pipe (7) is connected to the blast furnace gas delivery pipe.

2. The blast furnace gas access spray gun mechanism of the sintering flue gas deep purification device according to claim 1 is characterized in that: An annular sealing plate (9) is provided between the sleeve (8) outside the cold air inlet (11) and the gas inlet pipe (7); and an expansion joint (5) is provided on the cooling air pipe (4).

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