Blast furnace gas burner with built-in flue

Abstract

The utility model relates to the technical field of blast furnace gas burners, in particular to a blast furnace gas burner with a built-in flue, which comprises the flue, burners connected with the inside are arranged in the middles of two side surfaces of the flue, stable combustion chambers are sleeved at the inner ends of the burners, and a guide plate is arranged below the position between the two burners in the flue. The combustor comprises an air channel and a peripheral blast furnace gas annular cavity connected with the left end of the air channel, and a central ignition tube penetrating through the combustor is arranged at the right end of the air channel; according to the blast furnace gas burner with the built-in flue, the two symmetrical burners are arranged, the peripheral blast furnace gas annular cavity circumferentially and uniformly distributes blast furnace gas to the outlets of the burners through a plurality of distribution branch pipes, swirl vanes are matched with an expansion structure to achieve internal gas inlet to be of a swirl structure, flames are stabilized for ignition cooperation, and the combustion efficiency is improved. Under the cooperation of the contraction section and the sudden expansion section, the stable combustion chamber forms hedging flames with high rigidity to heat cold flue gas in the flue.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace gas burners, in particular to a flue built-in blast furnace gas burner. Background Art

[0002] Blast furnace gas is a by-product of the blast furnace ironmaking process, which is obtained by gasifying coke in the blast furnace. There is still a lot of room for improvement in pollutant emissions and high efficiency energy saving of blast furnace gas burners. Due to the low calorific value of blast furnace gas and different on-site working conditions, most blast furnace gas burners need to adopt external hot blast furnace internal combustion technology, which uses a hot blast furnace with a higher ambient temperature outside the main flue of the steel plant to perform swirl combustion on the blast furnace gas.

[0003] The utility model with the announcement number CN210772158U discloses a blast furnace gas and coke oven gas combined burner, which is composed of a fire-watching cylinder and a four-layer circular cylinder, which is coaxially connected around the fire-watching cylinder as a whole, and the four-layer circular cylinder is respectively a coke oven gas air distribution cylinder, a coke oven gas cylinder, a blast furnace gas cylinder, and a blast furnace gas air distribution cylinder from the inside to the outside, and the coke oven gas air distribution cylinder, the coke oven gas cylinder, the blast furnace gas cylinder, and the blast furnace gas air distribution cylinder are respectively equipped with a coke oven gas air distribution inlet, a coke oven gas inlet, a blast furnace gas inlet, and a blast furnace gas air distribution inlet, and their inlets are respectively connected to a gas transmission pipeline, a control valve is installed on the gas transmission pipeline, and the outlet of each cylinder is installed on the side of the boiler furnace;

[0004] The above technical scheme can effectively eliminate the problem that the gas burner is easily burned and the gas combustion efficiency is low when the two gases are directly mixed and burned; however, the existing blast furnace gas burners generally have the disadvantages of external burner, need to be equipped with a hot air type furnace body, poor flame rigidity, poor stability, inability to effectively burn out CO in the flue, etc., resulting in energy waste, small range of adaptability to working conditions, poor mixing effect of fuel and combustion aid, excessively high combustion temperature, the existence of local high temperature areas, complex structure and other disadvantages. Utility Model Content

[0005] The utility model aims to provide a flue-mounted blast furnace gas burner to solve the problem of a blast furnace gas and coke oven gas combined burner with the authorization announcement number CN210772158U proposed in the above background technology. However, the existing blast furnace gas burners generally have the disadvantages of external burner, need to match the hot air type furnace body, poor flame rigidity, poor stability, inability to effectively burn out CO in the flue, etc., resulting in energy waste, small adaptability to working conditions, poor mixing effect of fuel and combustion aid, too high combustion temperature, presence of local high temperature area, complex structure and other shortcomings.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A flue-mounted blast furnace gas burner comprises a flue, wherein burners connected to the interior are arranged at middle positions on both sides of the flue, a combustion stabilization chamber is sleeved on the inner end of the burner, a guide plate is arranged at the lower part of the flue between the two burners, the burner comprises an air channel and a peripheral blast furnace gas annular cavity connected to the left end of the air channel, a central ignition tube penetrating the burner is arranged at the right end of the air channel, a peripheral gas inlet communicating with the interior is arranged below the air channel, an air inlet communicating with the interior is arranged on the side wall of the peripheral blast furnace gas annular cavity, an expansion structure is arranged at the center of the left end of the peripheral blast furnace gas annular cavity, a swirl blade is arranged at the central position of the expansion structure, a plurality of distribution branches are interspersed at the outer wall of the swirl blade corresponding to the outer blast furnace gas annular cavity, and a central blast furnace gas channel is sleeved on the outer wall of the central ignition tube.

[0008] Preferably, an air inlet is provided in the flue below the guide plate, and an air outlet is provided in the flue above the guide plate.

[0009] In the utility model, the cooperation of the flue with the air inlet helps to continuously guide the air inlet, and with the cooperation of the air outlet, the timely discharge of the gas after the internal combustion is achieved, which helps to continuously carry out the corresponding gas treatment.

[0010] Preferably, a narrow guide plate is provided in the middle of the guide plate, and an inclined wide guide plate is provided on the lower surface of the guide plate near the narrow guide plate.

[0011] In the utility model, the cold flue gas from below the burner is affected by the guide plate and flows closely to the flue wall in the side wide guide plate area, and the central narrow guide plate distributes the flue gas to the center, thereby avoiding the central temperature of the counter-flame being too high and ablating the flue wall.

[0012] Preferably, the burner is welded and fixed to the combustion stabilization chamber, a sudden expansion section is provided at the right end of the combustion stabilization chamber, and a contraction section is provided at the left end of the combustion stabilization chamber.

[0013] In the utility model, the formed flame first passes through the sudden expansion section of the blast furnace gas stable combustion chamber to slow down, and after the gas is completely burned out, it is ejected from the blast furnace gas stable combustion chamber through the contraction section and enters the flue to form a strong rigid counter-flame, completing the heating effect on the cold flue gas in the flue.

[0014] Preferably, the air passage is fixed to the outer blast furnace gas annular cavity by welding, and the left end of the outer blast furnace gas annular cavity is fixed to the right end of the sudden expansion section by welding.

[0015] In the utility model, the stability of the combined installation of the air channel and the peripheral blast furnace gas ring cavity is increased, and the welding of the sudden expansion section and the peripheral blast furnace gas ring cavity increases the stability of the overall structure, which helps to guide the processed smoke into the flue.

[0016] Preferably, a flame monitor is provided at the right end of the air channel near the top, the central ignition tube is welded and fixed to the air channel and the outer blast furnace gas ring cavity, and the central blast furnace gas channel and the central ignition tube are an integrally formed structure.

[0017] In the utility model, blast furnace gas is divided into two paths, one path enters the central blast furnace gas channel and is ejected from the center of the burner in the form of a jet; the other path enters the peripheral blast furnace gas annular cavity and is evenly distributed circumferentially to the burner outlet through a plurality of distribution branch pipes.

[0018] Preferably, the peripheral gas inlet is welded and fixed to the air channel, and the interiors are interconnected; the air inlet is welded and fixed to the peripheral blast furnace gas ring cavity, and the interiors are interconnected.

[0019] In the utility model, the stability of the combined installation between adjacent parts is increased, which is helpful for stable processing and use.

[0020] Preferably, the distribution branch pipes are distributed in a ring shape with equal spacing, and the distribution branch pipes are all connected and coordinated with the interior of the peripheral blast furnace gas ring cavity, the swirl blades are distributed in a ring shape with equal spacing, and the expansion structure is fixedly connected to the swirl blades by screws.

[0021] In the utility model, after the combustion air enters the air channel, it passes through the swirl blades and the expansion structure in the axial direction in sequence, forming a stable strong swirl structure in the expansion structure for stabilizing the flame. The blast furnace gas and the combustion air are fully mixed downstream of the expansion structure, and the flame formed by the central ignition tube is ignited at the shear layer position and is observed by the flame monitor, thereby ensuring the safety of the burner during use.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The utility model sets two symmetrical burners, and with the cooperation of the central blast furnace gas inlet and the central ignition tube, the center of the burner sprays out in a jet, and the outer blast furnace gas ring cavity distributes the blast furnace gas circumferentially and evenly to the burner outlet through a plurality of distribution branches. The swirl blades cooperate with the expansion structure to realize the internal air intake presenting a swirl structure, and the stable flame is ignited. With the cooperation of the contraction section and the sudden expansion section, the stable combustion chamber forms a relatively rigid counter-flame to heat the cold flue gas in the flue.

[0024] 2. The utility model sets a flue in conjunction with an air inlet and an air outlet, which helps to continuously and fully burn the gas inside the flue. The guide plate is set in conjunction with a wide guide plate and a narrow guide plate to reduce the flow of cold flue gas close to the flue wall, avoid the center temperature of the counter-flame being too high and ablating the flue wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the combined structure of the flue and the burner of the utility model;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the flue part of the utility model;

[0027] Figure 3 This is a schematic diagram of the combined structure of the burner and the combustion stabilization chamber of the utility model;

[0028] Figure 4 This is a schematic diagram of the burner structure of the utility model;

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the burner and the combustion stabilization chamber combination of the utility model.

[0030] The meaning of each number in the figure is:

[0031] 1. Flue; 10. Air inlet; 11. Air outlet;

[0032] 2. Burner; 20. Air inlet; 21. Peripheral gas inlet; 22. Central blast furnace gas inlet; 23. Flame monitor; 24. Distribution branch pipe; 25. Swirl blade; 26. Expansion structure; 27. Central ignition tube; 270. Central blast furnace gas channel; 28. Air channel; 29. ​​Peripheral blast furnace gas ring cavity;

[0033] 3. Combustion stabilization chamber; 30. Contraction section; 31. Sudden expansion section;

[0034] 4. Guide plate; 40. Wide guide plate; 41. Narrow guide plate. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1-Figure 5 , this embodiment provides a technical solution:

[0037] A flue-mounted blast furnace gas burner comprises a flue 1. Burners 2 connected to the interior are arranged at the middle positions of both sides of the flue 1. A guide plate 4 is arranged below the two burners 2 inside the flue 1. An air inlet 10 is arranged below the guide plate 4 in the flue 1. An air outlet 11 is arranged above the guide plate 4 in the flue 1.

[0038] In the utility model, the flue 1 cooperates with the air inlet 10 to help continuously guide the air inlet, and with the cooperation of the air outlet 11, the gas after internal combustion is discharged in time, which helps to continuously carry out the corresponding gas treatment.

[0039] Furthermore, a narrow guide plate 41 is provided in the middle of the guide plate 4 , and an inclined wide guide plate 40 is provided on the lower surface of the guide plate 4 near the narrow guide plate 41 .

[0040] In the utility model, the cold flue gas from below the burner 2 is affected by the guide plate 4, flows close to the wall of the flue 1 in the area of ​​the side wide guide plate 40, and distributes the flue gas volume to the center at the central narrow guide plate 41, thereby avoiding the central temperature of the counter-flame being too high and burning the wall of the flue 1.

[0041] Specifically, a combustion stabilizing chamber 3 is sleeved on the inner end of the burner 2, and the burner 2 is welded and fixed to the combustion stabilizing chamber 3. A sudden expansion section 31 is provided at the right end of the combustion stabilizing chamber 3, and a contraction section 30 is provided at the left end of the combustion stabilizing chamber 3.

[0042] In the utility model, the formed flame first passes through the sudden expansion section 31 of the blast furnace gas stable combustion chamber 3 to slow down. After the gas is completely burned out, it is ejected from the blast furnace gas stable combustion chamber 3 through the contraction section 30 and enters the flue 1, forming a relatively rigid counter-flame to complete the heating effect on the cold flue gas in the flue 1.

[0043] It should be noted that the air passage 28 is welded and fixed to the outer blast furnace gas annular cavity 29 , and the left end of the outer blast furnace gas annular cavity 29 is welded and fixed to the right end of the sudden expansion section 31 .

[0044] In the utility model, the stability of the combined installation of the air channel 28 and the peripheral blast furnace gas ring cavity 29 is increased, and the welding of the expansion section 31 and the peripheral blast furnace gas ring cavity 29 increases the stability of the overall structure, which helps to guide the processed flue gas into the flue 1.

[0045] It is worth adding that the burner 2 includes an air channel 28 and a peripheral blast furnace gas annular cavity 29 connected to the left end of the air channel 28, a central ignition tube 27 penetrating the burner 2 is provided at the right end of the air channel 28, a peripheral gas inlet 21 connected to the interior is provided below the air channel 28, an air inlet 20 connected to the interior is provided on the side wall of the peripheral blast furnace gas annular cavity 29, an expansion structure 26 is provided at the center of the left end of the peripheral blast furnace gas annular cavity 29, a swirl blade 25 is provided at the center position of the expansion structure 26, a number of distribution branch pipes 24 are interspersed at the outer wall of the swirl blade 25 corresponding to the outer blast furnace gas annular cavity 29, and a central blast furnace gas channel 270 is sleeved on the outer wall of the central ignition tube 27.

[0046] Furthermore, a flame monitor 23 is provided at the right end of the air channel 28 near the top, the central ignition tube 27 is welded and fixed to the air channel 28 and the outer blast furnace gas ring cavity 29, and the central blast furnace gas channel 270 and the central ignition tube 27 are an integrally formed structure.

[0047] In the utility model, blast furnace gas is divided into two paths, one path enters the central blast furnace gas channel 270 and is ejected from the center of the burner 2 in the form of a jet; the other path enters the outer blast furnace gas annular cavity 29 and is evenly distributed circumferentially to the outlet of the burner 2 through a plurality of distribution branches 24.

[0048] Secondly, the outer gas inlet 21 is welded and fixed to the air passage 28, and the insides are interconnected. The air inlet 20 is welded and fixed to the outer blast furnace gas annular cavity 29, and the insides are interconnected.

[0049] In the utility model, the stability of the combined installation between adjacent parts is increased, which is helpful for stable processing and use.

[0050] Furthermore, the distribution branch pipes 24 are distributed in a ring shape with equal spacing, and the distribution branch pipes 24 are all connected and coordinated with the interior of the peripheral blast furnace gas ring cavity 29, the swirl blades 25 are distributed in a ring shape with equal spacing, and the expansion structure 26 is fixedly connected to the swirl blades 25 by screws.

[0051] In the utility model, after the combustion air enters the air channel 28, it passes through the swirl blades 25 and the expansion structure 26 in the axial direction in sequence, forming a stable strong swirl structure in the expansion structure 26 for stabilizing the flame. The blast furnace gas and the combustion air are fully mixed downstream of the expansion structure 26, and the flame formed by the central ignition tube 27 is ignited at the shear layer position and observed by the flame monitor 23, thereby ensuring the safety of the burner 2 during use.

[0052] When the flue-mounted blast furnace gas burner of this embodiment is used, the user first connects the air inlet 20 with the outer blast furnace gas annular cavity 29, the central blast furnace gas inlet 22 with the air channel 28, the outer blast furnace gas annular cavity 29 with the air channel 28 and the sudden expansion section 31 on the stable combustion chamber 3, the expansion structure 26 with multiple swirl blades 25 is installed on one side end of the outer blast furnace gas annular cavity 29, the central ignition tube 27 runs through the burner 2, and the flame monitor 23 is installed on the burner 2, the burner 2 is fixed on the two side walls of the flue 1 as a whole, and the guide plate 4 with a narrow guide plate 41 and a wide guide plate 40 is installed at the bottom of the flue 1 and close to the stable combustion chamber 3 on one end of the burner 2;

[0053] When full combustion is required, after the combustion-supporting air pipe and the blast furnace gas gas pipe are connected to the burner, the blast furnace gas and the combustion-supporting air enter independent gas channels respectively. The relative independence of the two channels ensures the safety of the combustion device in use. In order to achieve uniform distribution of the flame, the blast furnace gas is divided into two paths, one enters the central blast furnace gas channel 270 and is ejected from the center of the burner 2 in a jet, and the other enters the peripheral blast furnace gas annular cavity 29. The blast furnace gas is evenly distributed to the burner 2 outlet in the circumferential direction through multiple distribution branches 24. After the combustion-supporting air enters the air channel 28, it passes through the swirl blades 25 and the expansion structure 26 in the axial direction in turn, forming a stable strong swirl structure in the expansion structure 26 for stabilizing the flame. The blast furnace gas and the combustion-supporting air are fully mixed downstream of the expansion structure 26, and the flame formed by the central ignition tube 27 is ignited at the shear layer position and observed by the flame monitor 23, ensuring the safety of the burner in use;

[0054] The formed flame first passes through the sudden expansion section 31 of the blast furnace gas stable combustion chamber 3 to slow down. After the gas is completely burned out, it is ejected from the blast furnace gas stable combustion chamber 3 through the contraction section 30 and enters the flue 1, forming a relatively rigid counter-flame to complete the heating of the cold flue gas in the flue 1. The cold flue gas from below the burner 2 is affected by the guide plate 4 and flows close to the wall of the flue 1 in the area of ​​the wide guide plate 40. The narrow guide plate 41 at the center distributes a reasonable amount of flue gas to the center, thereby avoiding excessively high center temperature of the counter-flame and ablating the wall of the flue 1. The overall combination is easy to install and the simple structure helps to stabilize the combustion-supporting coordination and reduce resource waste.

Claims

1. A flue-mounted blast furnace gas burner, comprising a flue (1), wherein burners (2) connected to the interior are arranged at the middle positions of both sides of the flue (1), and a combustion stabilization chamber (3) is sleeved on the inner end of the burner (2), characterized in that: A guide plate (4) is provided at the lower part of the flue (1) between the two burners (2). The burner (2) comprises an air channel (28) and a peripheral blast furnace gas annular cavity (29) connected to the left end of the air channel (28). A central ignition tube (27) penetrating the burner (2) is provided at the right end of the air channel (28). A peripheral gas inlet (21) communicating with the interior is provided below the air channel (28). An air inlet (20) communicating with the interior is provided on the side wall of the peripheral blast furnace gas annular cavity (29). An expansion structure (26) is provided at the center of the left end of the peripheral blast furnace gas annular cavity (29). A swirl blade (25) is provided at the center of the expansion structure (26). A plurality of distribution branch pipes (24) are inserted at the outer wall of the swirl blade (25) at positions corresponding to the peripheral blast furnace gas annular cavity (29). A central blast furnace gas channel (270) is sleeved on the outer wall of the central ignition tube (27).

2. The flue built-in blast furnace gas burner according to claim 1, characterized in that: An air inlet (10) is provided in the flue (1) below the guide plate (4), and an air outlet (11) is provided in the flue (1) above the guide plate (4).

3. The flue built-in blast furnace gas burner according to claim 1, characterized in that: A narrow guide plate (41) is provided in the middle of the guide plate (4), and an inclined wide guide plate (40) is provided on the lower surface of the guide plate (4) near the narrow guide plate (41).

4. The flue built-in blast furnace gas burner according to claim 1, characterized in that: The burner (2) is welded and fixed to the combustion stabilization chamber (3); a sudden expansion section (31) is provided at the right end of the combustion stabilization chamber (3); and a contraction section (30) is provided at the left end of the combustion stabilization chamber (3).

5. The flue built-in blast furnace gas burner according to claim 1, characterized in that: The air passage (28) is welded and fixed to the outer blast furnace gas annular cavity (29), and the left end of the outer blast furnace gas annular cavity (29) is welded and fixed to the right end of the sudden expansion section (31).

6. The flue built-in blast furnace gas burner according to claim 1, characterized in that: A flame monitor (23) is provided at the right end of the air channel (28) near the top, the central ignition tube (27) is welded and fixed to the air channel (28) and the peripheral blast furnace gas ring cavity (29), and the central blast furnace gas channel (270) and the central ignition tube (27) are an integrally formed structure.

7. The flue built-in blast furnace gas burner according to claim 1, characterized in that: The peripheral coal gas inlet (21) and the air channel (28) are welded and fixed, and the interiors are interconnected; the air inlet (20) and the peripheral blast furnace coal gas annular cavity (29) are welded and fixed, and the interiors are interconnected.

8. The flue built-in blast furnace gas burner according to claim 1, characterized in that: The distribution branch pipes (24) are distributed in an annular shape with equal spacing, and the distribution branch pipes (24) are all connected and matched with the interior of the peripheral blast furnace gas ring cavity (29); the swirl blades (25) are distributed in an annular shape with equal spacing, and the expansion structure (26) is fixedly connected to the swirl blades (25) by screws.

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