Combustor for transforming internal combustion type hot blast stove into top combustion type hot blast stove

Abstract

The utility model provides a burner for transforming an internal combustion type hot blast stove into a top combustion type hot blast stove, which comprises a first stove shell and a second stove shell, a gas inlet and an air inlet are arranged on the second stove shell, and an air loop and a gas loop are arranged between the first stove shell and the second stove shell. An air hole channel, a gas hole channel and a mixed gas hole channel are formed in the first furnace shell, and the mixed gas hole channel is communicated with the combustion chamber through a mixed gas nozzle; the mixed gas nozzle is inclined towards the vault, and the included angle between the axis of the mixed gas nozzle and the central axis of the combustor is 0-45 degrees; the included angle between the orthographic projection of the central axis of the mixed gas nozzle on the horizontal plane and the radial direction of the combustor is 0-45 degrees. According to the utility model, the combustor of the internal combustion hot-blast stove is transformed, the air ring channel and the gas ring channel are arranged outside the stove under the condition that the original furnace shell of the internal combustion hot-blast stove is not changed, the gas hole channel and the air hole channel are arranged on the first furnace shell, and meanwhile, the mixed gas hole channel is additionally arranged, so that the combustor is more stable in structure and higher in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast furnaces for blast furnace ironmaking, in particular to a burner which is transformed from an internal combustion hot blast furnace into a top combustion hot blast furnace. Background Art

[0002] Hot blast furnaces, as energy conversion equipment in ironmaking blast furnaces, provide approximately 30% of the energy consumed in ironmaking production by supplying hot air. Since the 20th century, hot blast furnace technology has evolved from internal combustion, external combustion, and top combustion. With its compact size, stable structure, and lower investment, top combustion has gradually replaced both internal and external combustion furnaces, becoming the mainstream type of new hot blast furnace. In practice, internal combustion hot blast furnaces suffer from structural issues, leading to problems such as "short-circuiting" burnout between the combustion chamber and the regenerator, uneven heating of checker bricks, and incomplete gas combustion. Therefore, relocating the internal combustion hot blast furnace burner to the top, thereby transforming it into a more structurally sound top combustion furnace, is an urgent technical challenge. Utility Model Content

[0003] In order to address the deficiencies in the prior art, the utility model provides a burner for converting an internal-combustion hot blast furnace into a top-combustion hot blast furnace. The utility model transforms the burner of the internal-combustion hot blast furnace. Without changing the original furnace shell of the internal-combustion hot blast furnace, the air ring and the gas ring are placed outside the furnace, and gas ducts and air ducts are arranged on the old first furnace shell. At the same time, a mixed gas duct connected to the gas duct and the air duct is added, so that the burner structure is more stable and the efficiency is higher.

[0004] In order to achieve the above purpose, the specific solution adopted by the utility model is:

[0005] A burner for converting an internal combustion hot blast furnace into a top-fired hot blast furnace, the burner comprising an existing first furnace shell and a newly added second furnace shell along the periphery of a dome support ring. The outer side of the second furnace shell is provided with a gas inlet and an air inlet in sequence from top to bottom. An air ring duct connected to the air inlet and a gas ring duct connected to the gas inlet are provided above and below between the first furnace shell and the second furnace shell. The first furnace shell is provided with a plurality of air ducts connected to the air duct, a plurality of gas ducts connected to the gas duct, and a plurality of mixed gas ducts, one end of which is connected to both the air duct and the gas duct and the other end of which is connected to a combustion chamber of the burner. The mixed gas ducts are connected to the combustion chamber of the burner via mixed gas nozzles.

[0006] The mixture nozzle is inclined toward the dome, and the angle between the axis of the mixture nozzle and the central axis of the burner is 0-45°; the angle between the orthographic projection of the central axis of the mixture nozzle on the horizontal plane and the radial direction of the burner is 0-45°.

[0007] Furthermore, the angles between the axes of all the mixture nozzles and the central axis of the burner are not completely the same.

[0008] Furthermore, the combustion chamber of the burner is divided into two parts, left and right, with the central axis as the center. The angles between the axes of all the mixture nozzles set on each part and the central axis of the burner are the same, and the angles between the axes of the mixture nozzles set on the two parts and the central axis of the burner are different.

[0009] Furthermore, the included angles between the orthographic projections of the central axes of all the mixture nozzles on the horizontal plane and the radial direction of the burner are completely the same or not completely the same.

[0010] Furthermore, support bricks are provided at intervals in the air ring duct and the gas ring duct.

[0011] Beneficial effects:

[0012] (1) The burner of the utility model is provided with a gas ring and an air ring outside, which does not reduce the inner diameter of the heat storage chamber, does not reduce the cross-sectional area of ​​the heat storage chamber, and does not cause an increase in the medium resistance loss of the heat storage chamber.

[0013] (2) The gas and air are pre-mixed and then sprayed into the combustion chamber to form a mixed gas for combustion. This results in more complete mixing, more thorough combustion, and lower pollutant emissions.

[0014] (3) The mixture gas channel in the present invention has an inclination angle in both the circumferential and radial directions. By changing multiple directions and angles, the mixing of air and gas is made more complete, thereby improving the mixing efficiency of the burner. The angle between the axis of the mixture gas nozzle and the central axis of the burner is 0-45°, so that the mixture gas has a circumferential swirl in the dome, and the circumferential airflow distribution is more uniform. The angle between the orthographic projection of the central axis of the mixture gas nozzle on the horizontal plane and the radial direction of the burner is 0-45°. The mixture gas nozzle sprays the mixture gas toward the center of the dome, fully utilizing the dome space and avoiding vertical upward spraying that causes thermal shock damage to the dome wall.

[0015] (4) The burner in the present invention can retain the existing internal combustion hot blast furnace combustion chamber, lattice bricks, grate and hot blast outlet to reduce the transformation investment, or it can remove the existing internal combustion hot blast furnace combustion chamber, lattice bricks and grate to expand the cross-sectional area of ​​the heat storage chamber and increase the heat storage capacity of the hot blast furnace, providing more options for later transformation plans.

[0016] (5) There are 1 to 2 gas inlets and air inlets respectively, and the layout is flexible to adapt to different site conditions.

[0017] (6) Support bricks are installed at intervals in the gas ring and the air ring to make the ring masonry structure more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the burner in this utility model.

[0019] Figure 2 for Figure 1 Cross-sectional view along the AA axis.

[0020] Figure 3 for Figure 1 Cross-sectional view along the BB direction.

[0021] Figure 4 for Figure 1 Cross-sectional view along CC direction.

[0022] Figure 5 for Figure 1 Cross-sectional view along the DD direction.

[0023] Figure 6 Schematic diagram of the connection between gas channel, air channel and mixed gas channel (along the Figure 5 E direction).

[0024] Graphic markings: 1. Second furnace shell, 2. Gas ring, 3. Air ring, 4. Air duct, 5. Gas duct, 6. Mixed gas duct, 601. Mixed gas nozzle, 7. Gas inlet, 8. Air inlet, 9. Dome, 10. Support brick, 11. First furnace shell. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "upper" and "lower" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0027] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0028] The utility model discloses a burner which is transformed from an internal combustion hot blast furnace into a top combustion hot blast furnace. Figure 1-6 The burner includes a first furnace shell 11, a second furnace shell 1, a gas ring channel 2, an air ring channel 3, an air hole 4, a gas hole 5, a mixed gas hole 6, a gas inlet 7, an air inlet 8, a dome 9, and a support brick 10. The burner is based on the old first furnace shell 11, with a new second furnace shell 1 added around the outer periphery of the arch 9 support ring. An air ring 3 and a gas ring 2 are built with refractory bricks in the gap between the first furnace shell 11 and the second furnace shell 1, and support bricks 10 are arranged in the rings. The second furnace shell 1 is provided with an air inlet 8 connected to the air ring 3 and a gas inlet 7 connected to the gas ring 2. The first furnace shell 11 is provided with an air duct 4 connected to the air ring 3, a gas duct 5 connected to the gas ring 2, and a mixed gas duct 6 with one end connected to both the air duct 4 and the gas duct 5 and the other end connected to the combustion chamber of the burner. The mixed gas duct 6 is connected to the combustion chamber of the burner through a mixed gas nozzle 601. Air enters the mixed gas channel 6 from the air inlet 8, the air annulus 2 and the air hole 3. At the same time, gas enters the mixed gas channel 6 from the gas inlet 7, the gas annulus 2 and the gas hole 5. The air and gas are mixed in the mixed gas channel 6 and then ejected through the mixed gas nozzle 601 to form a flame.

[0029] The mixture nozzle 601 is arranged obliquely toward the dome 9. The angle between the axis of the mixture nozzle 601 and the central axis of the burner is 0-45° (i.e., there is an inclination in the circumferential direction), so that the mixture gas has a circumferential swirl in the dome 9, and the circumferential airflow distribution is more uniform. The angle between the orthographic projection of the central axis of the mixture nozzle 601 on the horizontal plane and the radial direction of the burner is 0-45° (i.e., there is an inclination in the radial direction), so that the mixture gas is ejected toward the center of the dome 9, fully utilizing the space of the dome 9 and avoiding thermal shock damage to the wall of the dome 9 caused by vertical upward injection.

[0030] It should be noted that, within a burner, the circumferential inclination angles of the mixture nozzles 601 are not exactly the same. A common practice is to divide the combustion chamber of the burner into two parts, left and right, with the central axis as the center. The axes of all the mixture nozzles 601 provided on each part have the same angle with the central axis of the burner, while the axes of the mixture nozzles 601 provided on the two parts have different angles with the central axis of the burner. In this way, flames of different heights are formed in the left and right parts of the combustion chamber, thereby making the air-gas mixing more complete and improving the mixing efficiency of the burner. Similarly, within a burner, the radial inclination angles of the mixture nozzles 601 are exactly the same or not exactly the same, and can be designed according to actual conditions.

[0031] The following is an analysis of the number of components in the burner. The gas inlet 7 and air inlet 8 are each provided with one or two, with flexible arrangement. The gas duct 5, air duct 4, and mixed gas duct 6 are generally provided in multiple, evenly spaced locations along the circumference of the burner.

[0032] This burner can achieve the purpose of transformation without changing the first furnace shell 11 of the original internal combustion hot blast stove burner. The new burner makes the air-gas mixing more complete by adding the mixed gas channel 6, thereby improving the mixing efficiency of the burner.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any equivalent changes or modifications made according to the essence of the present invention should be included in the scope of protection of the present invention.

Claims

1. A burner for converting an internal combustion hot blast stove into a top combustion hot blast stove, characterized in that: The burner comprises an existing first furnace shell and a newly added second furnace shell along the periphery of the dome support ring. The outer side of the second furnace shell is provided with a gas inlet and an air inlet in order from top to bottom. An air ring duct connected to the air inlet and a gas ring duct connected to the gas inlet are provided above and below between the first furnace shell and the second furnace shell. The first furnace shell is provided with a plurality of air ducts connected to the air duct, a plurality of gas ducts connected to the gas duct, and a plurality of mixed gas ducts, one end of which is connected to both the air duct and the gas duct and the other end is connected to the combustion chamber of the burner. The mixed gas ducts are connected to the combustion chamber of the burner via mixed gas nozzles. The mixture nozzle is inclined toward the dome, and the angle between the axis of the mixture nozzle and the central axis of the burner is 0-45°; the angle between the orthographic projection of the central axis of the mixture nozzle on the horizontal plane and the radial direction of the burner is 0-45°.

2. The burner for converting an internal combustion hot blast stove into a top combustion hot blast stove according to claim 1, characterized in that: The angles between the axes of all the mixture nozzles and the central axis of the burner are not exactly the same.

3. The burner for converting an internal combustion hot blast stove into a top combustion hot blast stove according to claim 2, characterized in that: The combustion chamber of the burner is divided into two parts, left and right, with the central axis as the center. The angles between the axes of all the mixture nozzles set on each part and the central axis of the burner are the same, and the angles between the axes of the mixture nozzles set on the two parts and the central axis of the burner are different.

4. The burner for converting an internal combustion hot blast stove into a top combustion hot blast stove according to claim 1, characterized in that: The angles between the orthographic projections of the central axes of all the mixture nozzles on the horizontal plane and the radial direction of the burner are completely the same or not completely the same.

5. The burner for converting an internal combustion hot blast stove into a top combustion hot blast stove according to claim 1, characterized in that: Support bricks are provided at intervals in the air ring and the gas ring.

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