CN217202810U - Mixing chamber wall structure of top combustion type hot blast stove - Google Patents
Mixing chamber wall structure of top combustion type hot blast stove Download PDFInfo
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- CN217202810U CN217202810U CN202123370943.8U CN202123370943U CN217202810U CN 217202810 U CN217202810 U CN 217202810U CN 202123370943 U CN202123370943 U CN 202123370943U CN 217202810 U CN217202810 U CN 217202810U
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Abstract
The utility model provides a mixing chamber wall structure of a top combustion type hot blast stove, which is characterized in that the top end of a cylindrical section is covered with an annular choke reinforcing plate, on one hand, the gas blowby between a fuel gas flow loop and a combustion-supporting gas flow loop and between a fuel gas flow nozzle and a combustion-supporting gas flow nozzle can be prevented, the safe use of the hot blast stove is ensured, on the other hand, the pressure stress born by the lower combustion-supporting gas flow loop and the combustion-supporting gas flow nozzle can be reduced, and the stability and the service life of the structure are ensured; furthermore, the utility model provides a cylinder section supports on annular brick support to at least one department in the bottom inboard of cylinder section and the bottom outside is provided with trapezoidal structure, makes to form longitudinal stress buffer structure between the combustion chamber of mixing chamber and below, and the compressive stress that the mixing chamber produced can not direct action on the combustion chamber wall body of lower part, has guaranteed the stable in structure of combustion chamber, and, when maintaining, changing the mixing chamber, also can not influence other structures of hot-blast furnace.
Description
Technical Field
The utility model relates to a metallurgy, thermal energy engineering technical field, concretely relates to used mixing chamber wall structure of top combustion formula hot-blast furnace, especially a mixing chamber wall structure of top combustion formula hot-blast furnace to blast air or other gaseous medium heating to the uniform temperature.
Background
The main task of blast furnace production is to provide steel-making pig iron for a steel-making process, so that the iron-making industry plays a crucial role in the economic development of a country, and the hot blast stove is used as an important accessory equipment of an iron-making system and is mainly used for providing high-temperature hot air for blast furnace production.
The hot blast stove is used as an important energy conversion device in the steel manufacturing process, and the heat quantity supplied to the hot blast of the blast furnace accounts for about one third of the heat consumption of the iron-making production. Since the 20 th century, the structural style of the hot blast stove has undergone the evolution and transformation processes of internal combustion type, external combustion type and top combustion type, and in the three typical hot blast stoves, the top combustion type hot blast stove has gradually replaced the internal combustion type hot blast stove and the external combustion type hot blast stove to become the main stream stove style of the newly-built hot blast stove due to the multiple technical advantages of compact space, stable structure, less occupied land and the like.
After the development of the top-burning hot blast stove for more than 50 years, the development process is basically the continuous improvement process of a burner in the process of the development, the burner of the top-burning hot blast stove is arranged at the arch top part of a regenerative chamber of the hot blast stove, the arch top space is used as a combustion chamber, an independent combustion chamber structure is cancelled, and the appearance of the burner of the top-burning hot blast stove is evolved from an initial semi-spherical large arch top to a common semi-spherical small arch top at present.
At present, the existing hemispherical arch top combustion hot blast stove has the following defects: firstly, the appearance structure of the mixing chamber is unreasonable, so that the combustion-supporting gas flow and the fuel gas flow cannot be completely mixed in a cross way; secondly, although the angle orientation of the air flow of the air-fuel material is changed in the individual patents, the air flow can not be basically formed into the three-dimensional cross mixing. Therefore, the defects, shortcomings and drawbacks of the prior art and the existing hot blast stove need to be improved and solved fundamentally.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a mixing chamber wall structure of top combustion formula hot-blast furnace through optimizing mixing chamber wall structure, makes its structure more reasonable, and the material quantity still less, practices thrift the investment, obtains helping the gas stream and can the intercrossing mix with the fuel gas stream, reaches to mix fully, can the fast combustion completely, simultaneously, prevents that the inside lining from appearing the hot-blast furnace shell high temperature phenomenon that the collapse arouses in the mixing chamber wall body, guarantees the safe operation of hot-blast furnace.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a wall structure of a mixing chamber of a top-burning hot blast stove comprises a cylindrical section and a frustum section, wherein a combustion-supporting airflow inlet is arranged at the outer side of the cylindrical section, a combustion-supporting airflow loop is arranged in the cylindrical section, and a plurality of layers of combustion-supporting airflow nozzles communicated with the combustion-supporting airflow loop and a cavity of the mixing chamber are arranged at the inner side of the combustion-supporting airflow loop; the outer side of the cone section is provided with a fuel gas inflow port, a fuel gas flow loop is arranged in the cone section, the inner side of the fuel gas flow loop is provided with a plurality of layers of fuel gas flow nozzles communicated with the fuel gas flow loop and a mixing chamber cavity, a partition wall is arranged between the combustion assisting gas flow loop and the fuel gas flow loop, the top end of the cylindrical section is covered with an annular flow blocking reinforcing plate, the flow blocking reinforcing plate is clamped between the cylindrical section and the cone section and is arranged in the partition wall, and the included angle between the cone section and the flow blocking reinforcing plate is 65-70 degrees.
Furthermore, the fuel airflow nozzles and the combustion-supporting airflow nozzles are respectively provided with a plurality of layers, the fuel airflow nozzle positioned on the uppermost layer is horizontally arranged, the fuel airflow nozzle positioned on the lower layer is obliquely and downwards arranged, and is obliquely inclined towards the inner wall of the frustum section in the horizontal direction;
the combustion-supporting airflow nozzle at the lowermost layer is horizontally arranged, and the combustion-supporting airflow nozzle at the upper layer is obliquely and upwards arranged and is inclined towards the inner wall of the cylindrical section in the horizontal direction.
Furthermore, the wall structure of the mixing chamber further comprises a spherical top section arranged at the top of the frustum section, and the frustum section and the spherical top section form a conical spherical structure together.
Furthermore, the combustion-supporting airflow inlet, the combustion-supporting airflow nozzle, the fuel gas inflow inlet and the fuel airflow nozzle are all made of steel plate supporting molds, and are integrally cast and molded by using high-strength ceramic wear-resistant castable.
Furthermore, the bottom of the mixing chamber wall structure is provided with an annular brick support for supporting the cylindrical section, and at least one of the inner side of the bottom and the outer side of the bottom of the cylindrical section is provided with a trapezoidal structure.
Furthermore, the section width of the combustion-supporting airflow nozzle is smaller than that of the fuel airflow nozzle.
Compared with the prior art, the beneficial effects of the utility model are that:
firstly, because the hot-blast stove is in the operation, the wall body of the mixing chamber, especially the fuel airflow loop and the combustion-supporting airflow loop are influenced by high-pressure airflow for a long time, the brick body of the hot-blast stove is easy to loose and crack, and even the gas blowby between the combustion-supporting airflow and the fuel airflow can be caused, so as to cause certain potential safety hazard, therefore, the utility model discloses the top end of the cylindrical section is covered with an annular flow-blocking reinforcing plate, the flow-blocking reinforcing plate is clamped between the cylindrical section and the frustum section and is arranged in the partition wall, the arrangement of the flow-blocking reinforcing plate can prevent the gas blowby between the fuel airflow loop and the combustion-supporting airflow loop and between the fuel airflow nozzle and the combustion-supporting airflow nozzle on one hand, and ensure the safe use of the hot-blast stove, and on the other hand, can reduce the pressure stress borne by the combustion-supporting airflow loop and the combustion-supporting airflow nozzle on the lower hand, and ensure the stability and the service life of the structure;
second, the utility model provides a cylinder section supports on annular brick holds in the palm, and at least one department in the bottom inboard of cylinder section and the bottom outside is provided with step-shaped structure, can adopt the smooth seam structure of step-shaped between the combustion chamber wall body of cylinder section and below, make and form longitudinal stress buffer structure between the combustion chamber of mixing chamber and below, the compressive stress that the mixing chamber produced can not direct action on the combustion chamber wall body of lower part, the stable in structure of combustion chamber has been guaranteed, and, maintain the mixing chamber, when changing, can not influence other structures of hot-blast furnace yet.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
the labels in the figure are: 1. the device comprises a frustum section, 2 a cylindrical section, 3 a flow blocking reinforcing plate, 4 a fuel airflow loop, 5 a fuel gas inflow port, 6 a fuel airflow nozzle, 7 a combustion-supporting airflow inflow port, 8 a combustion-supporting airflow nozzle, 9 a combustion-supporting airflow loop, 10 an annular brick support, 11 a fuel gas flow nozzle wall, 12 a fuel airflow outer loop wall, 13 a combustion-supporting airflow nozzle wall, 14 a combustion-supporting airflow outer loop wall, 15 a dome section.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the present invention are combined below to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments, rather than all embodiments of the present invention, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present invention.
As shown in fig. 1, the wall structure of the mixing chamber of the top-combustion hot-blast stove is a conical-column composite structure, that is, the wall structure of the mixing chamber is composed of an upper conical section 1, a lower cylindrical section 2 and a spherical top section 15 arranged on the top of the conical section 1, and the conical section 1 and the spherical top section 15 form a conical-spherical structure together.
As shown in fig. 3, the inner layer of the cylindrical section 2 is a combustion-supporting airflow spout wall 13, the outer layer is a combustion-supporting airflow outer annular wall 14, a combustion-supporting airflow inlet 7 is arranged on the outer side of the combustion-supporting airflow outer annular wall 14, a combustion-supporting airflow loop 9 is arranged in the combustion-supporting airflow outer annular wall 14 around the combustion-supporting airflow spout wall 13 in a circumferential manner, a plurality of layers of combustion-supporting airflow spouts 8 communicating the combustion-supporting airflow loop 9 and the mixing chamber cavity are arranged on the inner side of the combustion-supporting airflow loop 9, the combustion-supporting airflow spout 8 on the lowermost layer is horizontally arranged, and the combustion-supporting airflow spout 8 on the upper layer is obliquely and upwardly arranged in a trumpet shape from the inner circular wall of the combustion-supporting airflow spout wall 13 to the outer circular wall of the combustion-supporting airflow spout wall and is inclined toward the inner wall of the cylindrical section 2 in the horizontal direction.
As shown in FIG. 2, the inner layer of the cone section 1 is a fuel gas flow jet opening wall 11, the outer layer is a fuel gas flow outer ring wall 12, the outer side of the fuel gas flow outer ring wall 12 is provided with a fuel gas flow inlet 5, a fuel gas flow annular channel 4 is arranged in the fuel gas flow outer ring wall 12 around the fuel gas flow jet opening wall 11 in a circumferential manner, the inner side of the fuel gas flow annular channel 4 is provided with a plurality of layers of fuel gas flow jet openings 6 which are communicated with the fuel gas flow annular channel 4 and the mixing chamber cavity, the fuel gas flow jet opening 6 positioned at the uppermost layer is horizontally arranged, and the fuel gas flow jet openings 6 positioned at the lower layer are obliquely downwards arranged in a trumpet shape from the inner circular wall of the fuel gas flow jet opening wall 11 to the outer circular wall of the fuel gas flow jet opening wall and are inclined towards the inner wall of the cone section 1 in the horizontal direction.
As shown in fig. 1, a partition wall is arranged between the combustion-supporting airflow loop 9 and the fuel airflow loop 4, an annular choked flow reinforcing plate 3 covers the top end of the cylindrical section 2, the choked flow reinforcing plate 3 is clamped between the cylindrical section 2 and the frustum section 1 and is arranged in the partition wall, and an included angle between the frustum section 1 and the choked flow reinforcing plate 3 is 65-70 degrees.
Furthermore, the fuel gas flow nozzle wall 11 and the combustion-supporting gas flow nozzle wall 13 are formed by casting, the fuel gas flow outer ring wall 12 and the combustion-supporting gas flow outer ring wall 14 are formed by masonry, the combustion-supporting gas flow inlet 7, the combustion-supporting gas flow nozzle 8, the fuel gas flow inlet 5 and the fuel gas flow nozzle 6 are all formed by steel plate formwork support, and high-strength ceramic wear-resistant castable is used for integral casting.
Furthermore, an annular brick support 10 is arranged on a furnace shell of the hot blast furnace, the cylindrical section 2 of the wall body of the mixing chamber is supported on the annular brick support 10, and a stepped sliding seam structure is adopted between the cylindrical section and the wall body of the combustion chamber positioned below the cylindrical section, so that a longitudinal stress buffering structure is formed.
Furthermore, the section width of the combustion-supporting airflow nozzle 8 is smaller than that of the fuel airflow nozzle 6, and the arrangement density of the combustion-supporting airflow nozzle 8 and the fuel airflow nozzle 6 is adjusted according to the design requirements of the hot blast stove so as to meet the mixing proportion of the combustion-supporting airflow and the fuel airflow in the mixing chamber.
In the operation process of the hot blast stove, the wall body of the mixing chamber, especially the fuel airflow loop 4 and the combustion-supporting airflow loop 9, are influenced by high-pressure airflow for a long time, and the brick body of the mixing chamber is easy to loosen and crack, and even leads the blow-by between the combustion-supporting airflow and the fuel airflow to cause certain potential safety hazard, therefore, the choke reinforcing plate 3 in the utility model can prevent the blow-by between the fuel airflow loop 4 and the combustion-supporting airflow loop 9 and between the fuel airflow nozzle 6 and the combustion-supporting airflow nozzle 8 on one hand, and ensure the safe use of the hot blast stove, and can reduce the pressure stress borne by the combustion-supporting airflow loop 9 and the combustion-supporting airflow nozzle 8 on the other hand, and ensure the stability and the service life of the structure; the fuel airflow sprayed out of the fuel airflow nozzle 6 forms a central rotational flow which moves downwards in a rotating mode at the center of the mixing chamber, the combustion-supporting airflow sprayed out of the combustion-supporting airflow nozzle 8 forms a peripheral rotational flow which moves upwards in a rotating mode around the central rotational flow along the inner wall of the mixing chamber, the airflow speed sprayed out of the fuel airflow nozzle 6 is larger than that of the peripheral rotational flow, and when the peripheral rotational flow moves upwards to the fuel airflow nozzle 6, the peripheral rotational flow can change the flow direction and can be converged into the central rotational flow to form mixed gas of the fuel airflow and the combustion-supporting airflow.
Moreover, the design of the fuel gas inflow port 5 and the nozzle part known in the prior art adopts a bricklaying mode, the problems of dislocation, brick falling and the like are easy to occur to the nozzle brick in the operation of the hot blast stove, the use effect is influenced, the whole inlet and the nozzle part form an integrated structure by adopting a construction mode of formwork pouring and forming at the corresponding inlet and the nozzle part, the stress is stable, and the problem that the fuel inlet and the small brick shape of the nozzle are easy to fall off and collapse in the operation of the conventional hot blast stove is solved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A mixing chamber wall structure of a top combustion type hot blast stove comprises a cylindrical section (2) and a frustum section (1), wherein a combustion-supporting airflow inlet (7) is arranged at the outer side of the cylindrical section (2), a combustion-supporting airflow loop (9) is arranged in the cylindrical section (2), and a plurality of layers of combustion-supporting airflow nozzles (8) communicated with the combustion-supporting airflow loop (9) and a mixing chamber cavity are arranged at the inner side of the combustion-supporting airflow loop (9); the conic section outside of frustum section (1) sets up fuel gas inflow inlet (5), sets up fuel gas flow circuit (4) in the conic section, and the inboard of fuel gas flow circuit (4) sets up fuel gas flow spout (6) of multilayer intercommunication fuel gas flow circuit (4) and mixing chamber cavity, is equipped with partition wall, its characterized in that between combustion-supporting gas flow circuit (9) and fuel gas flow circuit (4):
the top end of the cylindrical section (2) is covered with an annular flow blocking reinforcing plate (3), the flow blocking reinforcing plate (3) is clamped between the cylindrical section (2) and the frustum section (1) and is arranged in the partition wall, and an included angle between the frustum section (1) and the flow blocking reinforcing plate (3) is 65-70 degrees.
2. The mixing chamber wall structure of a top combustion stove according to claim 1, characterized in that: the fuel airflow nozzles (6) and the combustion-supporting airflow nozzles (8) are all provided with multiple layers, the fuel airflow nozzle (6) positioned on the uppermost layer is horizontally arranged, and the fuel airflow nozzle (6) positioned on the lower layer is obliquely and downwards arranged and is inclined towards the inner wall of the frustum section (1) in the horizontal direction;
the combustion-supporting airflow spout (8) positioned at the lowermost layer is horizontally arranged, and the combustion-supporting airflow spout (8) positioned at the upper layer is obliquely and upwards arranged and is inclined towards the inner wall of the cylindrical section (2) in the horizontal direction.
3. The wall structure of the mixing chamber of a top combustion stove according to claim 1, characterized in that: the mixing chamber wall structure further comprises a spherical top section (15) arranged at the top of the frustum section (1), and the frustum section (1) and the spherical top section (15) jointly form a conical spherical structure.
4. The mixing chamber wall structure of a top combustion stove according to claim 1, characterized in that: the combustion-supporting airflow inlet (7), the combustion-supporting airflow nozzle (8), the fuel gas inflow inlet (5) and the fuel airflow nozzle (6) are all made of steel plate supporting molds and are integrally cast and molded by using high-strength ceramic wear-resistant castable.
5. The mixing chamber wall structure of a top combustion stove according to claim 1, characterized in that: the bottom of the mixing chamber wall structure is provided with an annular brick support (10) for supporting the cylindrical section (2), and at least one of the inner side and the outer side of the bottom of the cylindrical section (2) is provided with a trapezoidal structure.
6. The mixing chamber wall structure of a top combustion stove according to claim 1, characterized in that: the section width of the combustion-supporting airflow nozzle (8) is smaller than that of the fuel airflow nozzle (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123370943.8U CN217202810U (en) | 2021-12-30 | 2021-12-30 | Mixing chamber wall structure of top combustion type hot blast stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123370943.8U CN217202810U (en) | 2021-12-30 | 2021-12-30 | Mixing chamber wall structure of top combustion type hot blast stove |
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| Publication Number | Publication Date |
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| CN217202810U true CN217202810U (en) | 2022-08-16 |
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| CN202123370943.8U Active CN217202810U (en) | 2021-12-30 | 2021-12-30 | Mixing chamber wall structure of top combustion type hot blast stove |
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| CN (1) | CN217202810U (en) |
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