Top-fired hot blast stove combustion device

Abstract

The present invention provides a top-fired hot blast furnace combustion device, which relates to the technical field of combustion equipment. The top-fired hot blast furnace combustion device includes: a furnace shell having a combustion chamber; a furnace lining arranged in the furnace shell, wherein a first air-fuel mixing structure, a second air-fuel mixing structure, a third air-fuel mixing structure, and a fourth air-fuel mixing structure are sequentially arranged on the furnace lining along the height direction of the furnace lining, wherein the first air-fuel mixing structure is tilted downward at a first angle, and the fourth air-fuel mixing structure is tilted upward at a second angle; and a rotary gas introduction structure, wherein the rotary gas introduction structure is connected to the first air-fuel mixing structure, the second air-fuel mixing structure, the third air-fuel mixing structure, and the fourth air-fuel mixing structure, and the rotary gas introduction structure can supply rotating gas and air. The present invention can fully mix air and gas and appropriately extend the combustion time of the mixed gas, so that the mixed gas can be fully burned, thereby reducing the amount of nitrogen oxides generated.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, in particular to a top-fired hot blast stove combustion device. Background Art

[0002] In the prior art, most top-fired hot blast furnaces use a combustion structure consisting of a top burner and a lower combustion chamber. The top burner often uses a multi-structure nozzle arrangement with an upper gas nozzle and a lower combustion air nozzle. However, during use, the upper gas nozzle forms a columnar gas flow flowing downward in the burner cavity, and then the multi-structure combustion air flow is injected into the gas flow, causing the gas and combustion air to locally mix and burn. However, this layered gas distribution method results in a smaller contact surface between the gas and combustion air, resulting in poor mixing of the gas and combustion air, incomplete combustion of the gas, and a longer flame, which also increases the production of nitrogen oxides. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a top-fired hot blast stove combustion device for improving the mixing efficiency of air and gas and reducing the generation of nitrogen oxides.

[0004] The above-mentioned object of the present invention can be achieved by adopting the following technical solutions. The present invention provides a top-fired hot blast stove combustion device, comprising:

[0005] a furnace shell having a combustion chamber;

[0006] A furnace lining is provided in the furnace shell, wherein a first air-fuel mixing structure, a second air-fuel mixing structure, a third air-fuel mixing structure, and a fourth air-fuel mixing structure are sequentially provided on the furnace lining along a height direction of the furnace lining, wherein the first air-fuel mixing structure is tilted downward at a first angle, and the fourth air-fuel mixing structure is tilted upward at a second angle; and

[0007] A rotary gas introduction structure is connected to the first air-fuel mixing structure, the second air-fuel mixing structure, the third air-fuel mixing structure and the fourth air-fuel mixing structure, and is used to supply gas and air.

[0008] In a preferred embodiment of the present invention, the first air-fuel mixing structure includes a plurality of first air nozzles and a plurality of first gas nozzles arranged on the furnace lining, and the first air nozzles and the first gas nozzles are arranged in sequence and staggered at the same height, and the first air nozzles and the first gas nozzles are inclined downward at a first angle toward the middle of the combustion chamber.

[0009] In a preferred embodiment of the present invention, along the circumference of the furnace lining, each of the first air nozzles and each of the first gas nozzles are tangent to a first rotary circle preset in the combustion chamber along the same rotation direction.

[0010] In a preferred embodiment of the present invention, the first angle is in a range of 15°-45°.

[0011] In a preferred embodiment of the present invention, the second air-fuel mixing structure includes a plurality of second air nozzles and a plurality of second gas nozzles arranged on the furnace lining, and the second air nozzles and the second gas nozzles are arranged in sequence and staggered at the same height, and the second air nozzles and the second gas nozzles are arranged horizontally toward the middle of the combustion chamber.

[0012] In a preferred embodiment of the present invention, along the circumference of the furnace lining, each of the second air nozzles and each of the second gas nozzles are tangent to a second rotary circle preset in the combustion chamber along the same rotation direction.

[0013] In a preferred embodiment of the present invention, along the height direction of the furnace lining, the projections of the first rotary cutting circle and the second rotary cutting circle coincide with each other.

[0014] In a preferred embodiment of the present invention, the first air nozzle and the first gas nozzle are arranged along the same rotation direction as the first air nozzle and the first gas nozzle.

[0015] In a preferred embodiment of the present invention, the third air-fuel mixing structure includes a plurality of third air nozzles and a plurality of third gas nozzles arranged on the furnace lining, and the third air nozzles and the third gas nozzles are arranged in sequence and staggered at the same height, and the third air nozzles and the third gas nozzles are arranged horizontally toward the axis of the combustion chamber.

[0016] In a preferred embodiment of the present invention, the fourth air-fuel mixing structure includes a plurality of fourth air nozzles and a plurality of fourth gas nozzles arranged on the furnace lining, and the fourth air nozzles and the fourth gas nozzles are arranged in sequence and staggered at the same height, and the fourth air nozzles and the fourth gas nozzles are inclined upward at a second angle toward the axis of the combustion chamber.

[0017] In a preferred embodiment of the present invention, the second angle is in a range of 15°-45°.

[0018] In a preferred embodiment of the present invention, along the height direction of the furnace lining, the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are correspondingly arranged in the same row, and the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle are correspondingly arranged in the same row.

[0019] In a preferred embodiment of the present invention, along the height direction of the furnace lining, the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are evenly spaced, and the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle are evenly spaced.

[0020] In a preferred embodiment of the present invention, the rotary gas introduction structure includes:

[0021] A plurality of air channels are provided in the furnace lining, wherein the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle located in the same row are connected to one of the air channels;

[0022] an air supply ring pipe, the air supply ring pipe being arranged on the outside of the furnace shell;

[0023] a plurality of air branches disposed between the air supply ring and each of the air passages, each of the air branches being tangential to a third rotary circle preset in the combustion chamber along the same rotation direction, and capable of supplying rotating air to the air passage;

[0024] A plurality of gas channels are provided in the furnace lining, wherein the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle located in the same row are connected to one of the gas channels;

[0025] a gas supply ring pipe, the gas supply ring pipe being arranged on the outside of the furnace shell;

[0026] A plurality of gas branch pipes are arranged between the gas supply ring pipe and each of the gas channels, each of the gas branch pipes being tangent to a fourth rotary circle preset in the combustion chamber along the same rotation direction, and the gas branch pipes can supply rotating gas to the gas channels.

[0027] In a preferred embodiment of the present invention, the air supply ring pipe is provided with an air inlet, and the air inlet is connected to the air supply ring pipe along the tangential direction of the air supply ring pipe; the gas supply ring pipe is provided with a gas inlet, and the gas inlet is connected to the gas supply ring pipe along the tangential direction of the gas supply ring pipe.

[0028] The present invention also provides a hot blast stove, comprising the aforementioned top-fired hot blast stove combustion device.

[0029] The technical solution of the present invention has the following significant beneficial effects:

[0030] When used, the top-fired hot blast furnace combustion device of the present invention utilizes a rotary gas introduction structure to rotationally deliver gas and air to the first, second, third, and fourth air-fuel mixing structures. This allows the air and gas to achieve a certain rotational velocity before being ejected, significantly improving the mixing efficiency of the air and gas after ejection. The gas and air are further fully mixed by the first, second, third, and fourth air-fuel mixing structures and injected into the combustion chamber for combustion.

[0031] The present invention can form a downward swirl of air and gas in the combustion chamber through the first air-fuel mixing structure, and the mixing efficiency of the air and gas can be increased by the downward swirl. The second air-fuel mixing structure can further strengthen the downward swirl in the combustion chamber, thereby further improving the mixing efficiency and mixing uniformity of the air and gas. The third air-fuel mixing structure can improve the stability of the air and gas during the mixing process, and further increase the air and gas distribution volume, thereby obtaining a better combustion effect. The fourth air-fuel mixing structure can form an upward swirl of air and gas in the combustion chamber, and the upward swirl can slow down the descending speed of the downward swirl, so that the air and gas can be fully mixed, and the combustion time of the mixed gas is appropriately extended, so that the mixed gas can be fully burned, thereby reducing the amount of nitrogen oxides generated. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0034] Figure 1 It is a schematic cross-sectional view of a combustion device of a top-fired hot blast stove;

[0035] Figure 2 for Figure 1 Schematic diagram of the middle AA section;

[0036] Figure 3 for Figure 1 Schematic diagram of the middle BB section;

[0037] Figure 4 for Figure 1 Schematic diagram of the middle CC section;

[0038] Figure 5 for Figure 1 Schematic diagram of the middle DD cross section.

[0039] Reference numerals in the above drawings:

[0040] 1. Furnace shell; 11. Combustion chamber; 12. Furnace lining; 13. First rotary cutting circle; 14. Second rotary cutting circle; 15. Third rotary cutting circle; 16. Fourth rotary cutting circle;

[0041] 2. First air-fuel mixing structure; 21. First air nozzle; 22. First gas nozzle;

[0042] 3. Second air-fuel mixing structure; 31. Second air nozzle; 32. Second fuel gas nozzle;

[0043] 4. Third air-fuel mixing structure; 41. Third air nozzle; 42. Third gas nozzle;

[0044] 5. Fourth air-fuel mixing structure; 51. Fourth air nozzle; 52. Fourth gas nozzle;

[0045] 6. Rotary gas introduction structure; 61. Air channel; 62. Air supply ring pipe; 63. Air branch pipe; 64. Air inlet; 65. Gas channel; 66. Gas supply ring pipe; 67. Gas branch pipe; 68. Gas inlet. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Please refer to Figure 1As shown, an embodiment of the present invention provides a top-fired hot blast furnace combustion device, comprising: a furnace shell 1 having a combustion chamber 11; a furnace lining 12 arranged in the furnace shell 1, and along the height direction of the furnace lining 12, a first air-fuel mixing structure 2, a second air-fuel mixing structure 3, a third air-fuel mixing structure 4 and a fourth air-fuel mixing structure 5 are sequentially provided on the furnace lining 12, the first air-fuel mixing structure 2 is tilted downward at a first angle, and the fourth air-fuel mixing structure 5 is tilted upward at a second angle; and a rotary gas introduction structure 6, the rotary gas introduction structure 6 is connected to the first air-fuel mixing structure 2, the second air-fuel mixing structure 3, the third air-fuel mixing structure 4 and the fourth air-fuel mixing structure 5, and the rotary gas introduction structure 6 can supply rotating gas and air.

[0048] Overall, when in use, the top-fired hot blast furnace combustion device utilizes a rotary gas introduction structure 6 to rotationally deliver gas and air to the first air-fuel mixing structure 2, the second air-fuel mixing structure 3, the third air-fuel mixing structure 4, and the fourth air-fuel mixing structure 5. This allows the air and gas to achieve a certain rotational speed before being ejected, significantly improving the mixing efficiency of the air and gas after ejection. The first air-fuel mixing structure 2, the second air-fuel mixing structure 3, the third air-fuel mixing structure 4, and the fourth air-fuel mixing structure 5 further allow the gas and air to be fully mixed and injected into the combustion chamber 11 for combustion, allowing the mixed gas to fully burn, thereby improving combustion efficiency, reducing flame length, and reducing the generation of nitrogen oxides.

[0049] In an embodiment of the present invention, Figure 2 In the embodiment shown, the first air-fuel mixing structure 2 includes a plurality of first air nozzles 21 and a plurality of first gas nozzles 22 arranged on the furnace lining 12, and the first air nozzles 21 and the first gas nozzles 22 are arranged in a staggered manner at the same height, and the first air nozzles 21 and the first gas nozzles 22 are inclined downward at a first angle toward the middle of the combustion chamber 11.

[0050] By arranging the multiple first air nozzles 21 and the multiple first gas nozzles 22 at the same height, stratification of the air and gas in the first air-fuel mixing structure 2 can be prevented, thereby avoiding the formation of a flame front during the mixed combustion of the gas and air. By eliminating the flame front, the thermodynamic reaction between oxygen and nitrogen at the flame front is reduced, thereby reducing the amount of nitrogen oxides generated.

[0051] In this embodiment of the present invention, along the circumference of the furnace lining 12, each of the first air nozzles 21 and each of the first gas nozzles 22 are tangential to a first rotary circle 13 preset within the combustion chamber 11 along the same rotational direction. The first air-fuel mixing structure 2 creates a downward swirling flow of air and gas within the combustion chamber 11, which improves the mixing efficiency of the air and gas. Specifically, the first rotary circle 13 is the circle with the maximum radius within the area enclosed by the first air nozzles 21 and the first gas nozzles 22 at the same height.

[0052] By controlling the injection direction of the first air nozzles 21 and the first gas nozzles 22, each first air nozzle 21 and each first gas nozzle 22 can be tangent to the first rotary cutting circle 13 in a clockwise or counterclockwise direction. By adjusting the size of the first rotary cutting circle 13, the injection direction of each first air nozzle 21 and first gas nozzle 22 can be controlled accordingly, thereby controlling the rotational direction and rotational speed of the air and gas entering the combustion chamber 11. By causing the air and gas to mix rotationally within the combustion chamber 11, the mixing speed of the air and gas can be significantly accelerated.

[0053] In an embodiment of the present invention, the first angle is between 15° and 45°. Specifically, in one feasible embodiment of the present invention, the first angle is set to 45°. Setting the first angle at 45° allows the first air nozzle 21 and the first gas nozzle 22 to spray toward the center of the combustion chamber 11, thereby generating a downward swirling flow within the combustion chamber 11, which facilitates the mixing of air and gas. Designers can adjust the first angle according to their needs, and this is not a specific limitation.

[0054] In an embodiment of the present invention, Figure 3 In the embodiment shown, the second air-fuel mixing structure 3 includes a plurality of second air nozzles 31 and a plurality of second gas nozzles 32 arranged on the furnace lining 12, and the second air nozzles 31 and the second gas nozzles 32 are arranged in sequence and staggered at the same height, and the second air nozzles 31 and the second gas nozzles 32 are arranged horizontally toward the middle of the combustion chamber 11.

[0055] By arranging the multiple second air nozzles 31 and the multiple second gas nozzles 32 at the same height, stratification of the air and gas in the second air-fuel mixing structure 3 can be prevented, thereby avoiding the formation of a flame front during the mixed combustion of the gas and air. By eliminating the flame front, the thermodynamic reaction between oxygen and nitrogen at the flame front is reduced, thereby reducing the amount of nitrogen oxides generated.

[0056] In this embodiment of the present invention, along the circumference of the furnace lining 12, each of the second air nozzles 31 and the second gas nozzles 32 are tangential to a second rotary circle 14 pre-set within the combustion chamber 11 and in the same rotational direction. The second air-fuel mixing structure 3 further enhances the swirl velocity of the downward swirl flow, thereby improving the mixing efficiency of the air and gas. Specifically, the second rotary circle 14 is the circle with the maximum radius within the area enclosed by the second air nozzles 31 and the second gas nozzles 32 at the same height.

[0057] By controlling the injection direction of the second air nozzles 31 and the second gas nozzles 32, each second air nozzle 31 and each second gas nozzle 32 can be tangent to the second rotary cutting circle 14 in a clockwise or counterclockwise direction. By adjusting the size of the second rotary cutting circle 14, the injection direction of each second air nozzle 31 and second gas nozzle 32 can be controlled accordingly, thereby controlling the rotational direction and rotational speed of the air and gas entering the combustion chamber 11. By causing the air and gas to mix rotationally within the combustion chamber 11, the mixing speed of the air and gas can be significantly accelerated.

[0058] In this embodiment of the present invention, the projections of the first rotary circle 13 and the second rotary circle 14 overlap along the height direction of the furnace lining 12. By aligning the projections of the first rotary circle 13 and the second rotary circle 14, the first air-fuel mixing structure 2 and the second air-fuel mixing structure 3 can generate relatively similar swirl directions and swirl magnitudes, thereby improving the stability of the downward swirl within the combustion chamber 11 and facilitating the formation of a relatively stable swirl mixing field, thereby increasing the uniformity of the mixing of air and gas.

[0059] In this embodiment of the present invention, the first air nozzles 21 and the first gas nozzles 22 are arranged in the same rotational direction as the first air nozzles 21 and the first gas nozzles 22. By arranging them in the same rotational direction, the rotational speed of the first air-fuel mixing structure 2 and the rotational speed of the second air-fuel mixing structure 3 can be superimposed, thereby increasing the overall swirl speed within the combustion chamber 11. By increasing the swirl speed within the combustion chamber 11, the mixing efficiency of air and gas can be improved.

[0060] In an embodiment of the present invention, Figure 4 In the illustrated embodiment, the third air-fuel mixing structure 4 includes a plurality of third air nozzles 41 and a plurality of third gas nozzles 42 disposed on the furnace lining 12. Each of the third air nozzles 41 and third gas nozzles 42 is staggered and arranged at the same height. Each of the third air nozzles 41 and third gas nozzles 42 is horizontally arranged toward the axis of the combustion chamber 11. The third air-fuel mixing structure 4 improves the stability of the air and gas mixing process and further increases the air and gas distribution volume, thereby achieving better combustion results.

[0061] By staggering the third air nozzles 41 and third gas nozzles 42 at the same height, the air and gas are mixed immediately upon ejection, improving mixing efficiency. Placing multiple third air nozzles 41 and multiple third gas nozzles 42 at the same height prevents stratification of the air and gas in the third air-fuel mixing structure 4, thereby avoiding the formation of a flame front during the mixed combustion of gas and air. Eliminating this flame front reduces the thermodynamic reaction between oxygen and nitrogen at the flame front, thereby reducing the formation of nitrogen oxides.

[0062] In an embodiment of the present invention, Figure 5 In the embodiment shown, the fourth air-fuel mixing structure 5 includes a plurality of fourth air nozzles 51 and a plurality of fourth gas nozzles 52 arranged on the furnace lining 12, and the fourth air nozzles 51 and the fourth gas nozzles 52 are arranged in a staggered manner at the same height, and the fourth air nozzles 51 and the fourth gas nozzles 52 are inclined upward at a second angle toward the axis of the combustion chamber 11.

[0063] By arranging the plurality of fourth air nozzles 51 and the plurality of fourth gas nozzles 52 at the same height, stratification of the air and gas in the fourth air-fuel mixing structure 5 can be prevented, thereby preventing the formation of a flame front during the mixed combustion of the gas and air. By eliminating the flame front, the thermodynamic reaction between oxygen and nitrogen at the flame front is reduced, thereby reducing the amount of nitrogen oxides generated.

[0064] In an embodiment of the present invention, the second angle is between 15° and 45°. Specifically, in one feasible embodiment of the present invention, the second angle is set to 30°. By setting the second angle to 45°, the fourth air nozzle 51 and the fourth gas nozzle 52 can spray toward the center of the combustion chamber 11, thereby generating an upward swirl flow within the combustion chamber 11. This upward swirl flow slows the downward swirl flow, allowing the air and gas to mix thoroughly, extending the combustion time of the gas and ensuring complete combustion, thereby reducing the generation of nitrogen oxides. Designers can also adjust the first angle according to actual needs, and this is not specifically limited here.

[0065] In an embodiment of the present invention, along the height direction of the furnace lining 12, the first air nozzle 21, the second air nozzle 31, the third air nozzle 41 and the fourth air nozzle 51 are correspondingly arranged in the same column, and the first gas nozzle 22, the second gas nozzle 32, the third gas nozzle 42 and the fourth gas nozzle 52 are correspondingly arranged in the same column.

[0066] By arranging the first air nozzle 21, the second air nozzle 31, the third air nozzle 41 and the fourth air nozzle 51 in the same row, and arranging the first gas nozzle 22, the second gas nozzle 32, the third gas nozzle 42 and the fourth gas nozzle 52 in the same row, the air nozzles and the gas nozzles can be arranged in sequence and spaced apart along the circumference of the combustion chamber 11, thereby improving the uniformity of the distribution of air and gas along the circumference of the combustion chamber 11, completing the premixing operation of the air and gas before they are ejected, and significantly improving the mixing efficiency of the air and gas.

[0067] Designers can determine the number of air nozzles and gas nozzles according to usage needs. For example, 10 to 30 air nozzles or gas nozzles can be set in the same air-fuel mixing structure, and there is no limit here.

[0068] In an embodiment of the present invention, along the height direction of the furnace lining 12, the first air nozzle 21, the second air nozzle 31, the third air nozzle 41 and the fourth air nozzle 51 are evenly spaced, and the first gas nozzle 22, the second gas nozzle 32, the third gas nozzle 42 and the fourth gas nozzle 52 are evenly spaced.

[0069] By evenly spacing the air and gas nozzles, the uneven distribution of air and gas along the height of the furnace lining 12 is eliminated, and the uniformity of the premixing effect achieved by the air and gas nozzles is improved. When the air and gas are thoroughly and evenly mixed, the combustion efficiency of the gas is improved, resulting in a shorter flame length, known as short-flame combustion. By achieving short-flame combustion of the gas and air, the gas is fully burned, thereby reducing the generation of nitrogen oxides.

[0070] In an embodiment of the present invention, the rotary gas introduction structure 6 includes: a plurality of air channels 61 arranged in the furnace lining 12, the first air nozzle 21, the second air nozzle 31, the third air nozzle 41 and the fourth air nozzle 51 located in the same row are connected to one of the air channels 61; an air supply ring pipe 62, the air supply ring pipe 62 is arranged on the outside of the furnace shell 1; a plurality of air branches 63 arranged between the air supply ring pipe 62 and each of the air channels 61, each of the air branches 63 is tangent to the third rotary cutting circle 15 preset in the combustion chamber 11 along the same rotation direction, and the air branch pipe 63 can supply air to the air channel 61. The furnace lining 12 includes a plurality of gas channels 65, the first gas nozzle 22, the second gas nozzle 32, the third gas nozzle 42 and the fourth gas nozzle 52 located in the same row are connected to a corresponding gas channel 65; a gas supply ring pipe 66, the gas supply ring pipe 66 is arranged on the outside of the furnace shell 1; a plurality of gas branch pipes 67 are arranged between the gas supply ring pipe 66 and each of the gas channels 65, each of the gas branch pipes 67 is tangent to the fourth rotary circle 16 preset in the combustion chamber 11 along the same rotation direction, and the gas branch pipes 67 can supply rotating gas to the gas channels 65.

[0071] Specifically, in one embodiment of the present invention, the projections of the first rotary circle 13, the second rotary circle 14, the third rotary circle 15, and the fourth rotary circle 16 overlap along the height of the furnace lining 12. By aligning the projections of multiple rotary circles, a more stable rotating mixing field can be generated within the combustion chamber 11. Designers can determine the number of air branches 63 and gas branches 67 based on actual use, and this is not a limitation. For example, the number of air branches 63 can be the same as the number of air nozzles in the same air-fuel mixing structure, and the number of gas branches 67 can be the same as the number of gas nozzles in the same air-fuel mixing structure.

[0072] In another embodiment, since the third air-fuel mixing structure 4 and the fourth air-fuel mixing structure 5 are both arranged toward the axis of the combustion chamber 11, the third air-fuel mixing structure 4 and the fourth air-fuel mixing structure 5 cannot generate swirl, and therefore the air branch pipes 63 and the gas branch pipes 67 connected to the third air-fuel mixing structure 4 and the fourth air-fuel mixing structure 5 can be arranged perpendicular to the axis of the combustion chamber 11.

[0073] The air branch pipe 63 allows the air to rotate during the air delivery process. Multiple air branch pipes 63 are used to rotationally deliver the air within the air supply annular pipe 62 to the various air nozzles, thereby imparting a certain rotational velocity to the air before it is ejected into the combustion chamber 11. The gas branch pipe 67 allows the gas to rotate during the gas delivery process. Multiple gas branch pipes 67 are used to rotationally deliver the gas within the gas supply annular pipe 66 to the various gas nozzles, thereby imparting a certain rotational velocity to the gas before it is ejected into the combustion chamber 11. The rotating air and gas mix rapidly, thereby improving the mixing efficiency and uniformity of the air and gas.

[0074] By arranging the air supply ring pipe 62 and the gas supply ring pipe 66 outside the furnace shell 1, the air supply ring pipe 62 and the gas supply ring pipe 66 can be prevented from being affected by the high temperature of the furnace body, and the air supply ring pipe 62 and the gas supply ring pipe 66 are facilitated for maintenance.

[0075] In an embodiment of the present invention, an air inlet 64 is provided on the air supply ring pipe 62, and the air inlet 64 is connected to the air supply ring pipe 62 along the tangential direction of the air supply ring pipe 62; a gas inlet 68 is provided on the gas supply ring pipe 66, and the gas inlet 68 is connected to the gas supply ring pipe 66 along the tangential direction of the gas supply ring pipe 66.

[0076] By arranging the air inlet 64 tangentially to the air supply annular tube 62, air can be rotationally introduced into the annular tube 62 through the air inlet 64. This allows the rotating air within the annular tube 62 to further superimpose the rotational effect of the air branch 63, significantly increasing the air's rotational speed. By arranging the gas inlet 68 tangentially to the annular tube 66, gas can be rotationally introduced into the annular tube 66 through the gas inlet 68. This allows the rotating gas within the annular tube 66 to further superimpose the rotational effect of the gas branch 67, significantly increasing the gas's rotational speed. By increasing the rotational speed of the air and gas before being ejected, the air and gas have a higher rotational speed after being ejected, significantly improving the mixing efficiency of the air and gas after ejection.

[0077] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0078] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A top-fired hot blast stove combustion device, characterized in that: include: a furnace shell having a combustion chamber; A furnace lining is provided in the furnace shell, wherein a first air-fuel mixing structure, a second air-fuel mixing structure, a third air-fuel mixing structure and a fourth air-fuel mixing structure are sequentially provided on the furnace lining along a height direction of the furnace lining, wherein the first air-fuel mixing structure is tilted downward at a first angle, and the fourth air-fuel mixing structure is tilted upward at a second angle; as well as a rotary gas introduction structure, the rotary gas introduction structure being in communication with the first air-fuel mixing structure, the second air-fuel mixing structure, the third air-fuel mixing structure, and the fourth air-fuel mixing structure, the rotary gas introduction structure being capable of supplying rotating gas and air; The first air-fuel mixing structure includes a plurality of first air nozzles and a plurality of first gas nozzles provided on the furnace lining, wherein the first air nozzles and the first gas nozzles are arranged alternately in sequence at the same height, and the first air nozzles and the first gas nozzles are inclined downward at a first angle toward the middle of the combustion chamber; The second air-fuel mixing structure includes a plurality of second air nozzles and a plurality of second gas nozzles provided on the furnace lining, wherein the second air nozzles and the second gas nozzles are arranged alternately in sequence at the same height, and the second air nozzles and the second gas nozzles are arranged horizontally toward the middle of the combustion chamber; The third air-fuel mixing structure includes a plurality of third air nozzles and a plurality of third gas nozzles provided on the furnace lining, wherein the third air nozzles and the third gas nozzles are staggered and arranged at the same height, and the third air nozzles and the third gas nozzles are all arranged horizontally toward the axis of the combustion chamber; The fourth air-fuel mixing structure includes a plurality of fourth air nozzles and a plurality of fourth gas nozzles provided on the furnace lining, wherein the fourth air nozzles and the fourth gas nozzles are staggered and arranged in sequence at the same height, and each of the fourth air nozzles and the fourth gas nozzles are inclined upward at a second angle toward the axis of the combustion chamber; the magnitude of the second angle is 15°-45°; The rotary gas introduction structure includes: a plurality of air channels arranged in the furnace lining, wherein the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle located in the same row are connected to corresponding one of the air channels; an air supply ring pipe, wherein the air supply ring pipe is arranged on the outside of the furnace shell; a plurality of air branches arranged between the air supply ring pipe and each of the air channels, wherein each of the air branches is tangent to a third rotary circle preset in the combustion chamber along the same rotation direction, and the air branches are capable of supplying rotating air to the air channels; a plurality of gas channels arranged in the furnace lining, wherein the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle located in the same row are connected to corresponding one of the gas channels; a gas supply ring pipe, wherein the gas supply ring pipe is arranged on the outside of the furnace shell; a plurality of gas branches arranged between the gas supply ring pipe and each of the gas channels, wherein each of the gas branches is tangent to a fourth rotary circle preset in the combustion chamber along the same rotation direction, and the gas branches are capable of supplying rotating gas to the gas channels.

2. The top-fired hot blast stove combustion device according to claim 1, characterized in that: Along the circumference of the furnace lining, each of the first air nozzles and each of the first gas nozzles are tangent to a first rotary circle preset in the combustion chamber along the same rotation direction.

3. The top-fired hot blast stove combustion device according to claim 1, characterized in that: The first angle is between 15° and 45°.

4. The top-fired hot blast stove combustion device according to claim 2, characterized in that: Along the circumference of the furnace lining, each of the second air nozzles and each of the second gas nozzles are tangent to a second rotary circle preset in the combustion chamber along the same rotation direction.

5. The top-fired hot blast stove combustion device according to claim 4, characterized in that: Along the height direction of the furnace lining, the projections of the first rotary cutting circle and the second rotary cutting circle coincide with each other.

6. The top-fired hot blast stove combustion device according to claim 5, characterized in that: The first air nozzle and the first gas nozzle are arranged along the same rotation direction as the first air nozzle and the first gas nozzle.

7. The top-fired hot blast stove combustion device according to claim 1, characterized in that: Along the height direction of the furnace lining, the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are correspondingly arranged in the same column, and the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle are correspondingly arranged in the same column.

8. The top-fired hot blast stove combustion device according to claim 7, characterized in that: Along the height direction of the furnace lining, the first air nozzle, the second air nozzle, the third air nozzle and the fourth air nozzle are evenly spaced, and the first gas nozzle, the second gas nozzle, the third gas nozzle and the fourth gas nozzle are evenly spaced.

9. The top-fired hot blast stove combustion device according to claim 1, characterized in that: The air supply ring pipe is provided with an air inlet, which is connected to the air supply ring pipe along the tangent direction of the air supply ring pipe; the gas supply ring pipe is provided with a gas inlet, which is connected to the gas supply ring pipe along the tangent direction of the gas supply ring pipe.

Images