CN113046506A - Top combustion hot blast stove with variable cross-section nozzle burner - Google Patents
Top combustion hot blast stove with variable cross-section nozzle burner Download PDFInfo
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- CN113046506A CN113046506A CN202110187835.2A CN202110187835A CN113046506A CN 113046506 A CN113046506 A CN 113046506A CN 202110187835 A CN202110187835 A CN 202110187835A CN 113046506 A CN113046506 A CN 113046506A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/10—Other details, e.g. blast mains
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Abstract
The invention discloses a top combustion type hot blast stove with a variable cross-section nozzle burner, which comprises a burner at the top, a combustion chamber in the middle and a regenerator at the lower part; the combustor comprises a combustor heat insulation wall, a combustor inner cavity, a coal gas inlet, a coal gas annular cavity, a coal gas nozzle, an air inlet, an air annular cavity and an air nozzle; coal gas and air enter the coal gas annular cavity and the air annular cavity respectively through the coal gas inlet and the air inlet in a tangential air inlet mode; the sectional areas of the coal gas nozzle and the air nozzle are gradually enlarged along the airflow direction, and the coal gas and the air are uniformly sprayed into the inner cavity of the combustor; the coal gas and the air are fully mixed and then stably combusted in the combustion chamber, and the combusted high-temperature flue gas uniformly enters the regenerator for heat exchange. The invention can effectively solve the problem of air flow center offset in the hot blast stove, and achieves the purposes of improving the temperature of hot air and prolonging the service life of the hot blast stove.
Description
Technical Field
The invention relates to the field of blast furnace hot blast stoves in metallurgical industry, in particular to a top combustion type hot blast stove with a variable cross-section nozzle burner.
Background
The hot blast stove is a necessary configuration in the blast furnace ironmaking process and is mainly used for continuously providing high-temperature combustion-supporting air for the blast furnace. The top combustion hot blast stove has the characteristics of stable structure, high air temperature, long service life and low investment, and is widely applied to new construction and reconstruction projects of the hot blast stove and achieves good effect.
Air and coal gas of a traditional top combustion type hot blast stove enter an air annular cavity and a coal gas annular cavity along the radial direction of a combustor through an air inlet and a coal gas inlet, an included angle is formed between an air nozzle and the radial direction of the combustor and between the air nozzle and the coal gas nozzle, the air and the coal gas are sprayed out from a nozzle on the inner wall of the combustor and then are subjected to rotary cutting and mixing, the mixed gas enters a combustion chamber to complete combustion reaction, high-temperature flue gas generated by combustion enters a heat storage chamber to perform heat storage with checker bricks, cold air is introduced into the heat storage chamber after the heat storage is completed and is heated by the heat of the checker bricks, and the cold air is heated into high-temperature air with the temperature of more than 1200 ℃ after the heat storage.
The following problems are also commonly found in the practical application of top-fired stoves: the problems of local high temperature in the combustion chamber, uneven distribution of air flow in the furnace, uneven heating of checker bricks and the like seriously restrict the operation efficiency and the structural stability of the hot blast stove. Theoretical simulation analysis shows that: the gas and the air form high-speed rotating airflow in the combustion chamber after being mixed in a rotary cutting way in the inner cavity of the combustor, and the airflow deviates away from the center in the process of entering the combustion chamber from the combustor. The burner of the top-burning hot-blast stove determines the fuel mixing in the stove, the combustion effect and the distribution condition of the flow field, the air and the coal gas of the burner of the traditional top-burning hot-blast stove radially enter an air ring cavity and a coal gas ring cavity along the burner, the pressure and the flow of the nozzle close to an air inlet and a coal gas inlet are higher, the pressure and the flow of the nozzle far away from the air inlet and the coal gas inlet are lower, the pressure and the flow of each nozzle are different, the coal gas and the air can not be fully mixed and combusted, the flue gas velocity field and the temperature field after combustion are also uneven and stable, uneven high-temperature flue gas can cause checker bricks to be heated unevenly after entering a regenerator, and the problems of structural damage of the hot-blast stove, reduction of air temperature, increase of energy.
In recent years, various improved top-fired stoves have not fundamentally addressed the problem of off-center airflow. Therefore, in order to solve the above-mentioned problems, the structure of the conventional top-fired hot blast stove, especially the structure of the burner, must be improved to satisfy the requirements of high wind temperature and long life.
Disclosure of Invention
Aiming at the problems in the prior top-burning hot blast stove technology, the invention mainly aims to provide a top-burning hot blast stove with a variable cross-section nozzle burner, which solves the problems of air flow center offset and the like of the prior top-burning hot blast stove, and aims to realize uniform distribution of a velocity field and a temperature field in the hot blast stove, improve the utilization efficiency of a heat accumulator and prolong the service life of the hot blast stove.
The invention adopts the technical scheme that the top combustion type hot blast stove with the variable cross-section nozzle burner comprises a burner at the top, a combustion chamber in the middle and a regenerator at the lower part; the combustor comprises a combustor heat insulation wall, a combustor inner cavity, a coal gas inlet, a coal gas annular cavity, a coal gas nozzle, an air inlet, an air annular cavity and an air nozzle; the gas inlet is tangentially connected with a gas annular cavity, and the gas annular cavity is annularly arranged at the upper part of the heat insulation wall of the burner and is communicated with the inner cavity of the burner through a plurality of gas nozzles; the air inlet is tangentially connected with an air annular cavity, and the air annular cavity is annularly arranged at the lower part of the heat insulation wall of the combustor and is communicated with the inner cavity of the combustor through a plurality of air nozzles.
Furthermore, the gas nozzle is annularly arranged on the outer side of the inner cavity of the combustor, and the sectional area of the gas nozzle is gradually enlarged along the direction far away from the gas inlet.
Further, the air nozzle is annularly arranged outside the inner cavity of the combustor, and the sectional area of the air nozzle is gradually enlarged along the direction far away from the air inlet.
Further, the direction of the gas nozzle and the gas flow direction of the gas ring cavity are not more than 90 degrees.
Further, the direction of the air nozzle and the airflow direction of the air ring cavity are not more than 90 degrees.
Furthermore, the cross section of the coal gas inlet is transited from a circular section to a rectangular section along the flowing direction of the coal gas, the width of the coal gas inlet is continuously reduced in the horizontal direction, and the height of the coal gas inlet is continuously increased in the vertical direction.
Further, the cross section of the air inlet is changed from a circular section to a rectangular section along the air flowing direction, the width of the air inlet is continuously reduced in the horizontal direction, and the height of the air inlet is continuously increased in the vertical direction.
Compared with the prior art, the invention has at least the following beneficial effects:
the gas inlet and the air inlet are changed into tangential air inlet along the air ring cavity and the gas ring cavity, so that the impact of inlet airflow on the wall surfaces of the gas ring cavity and the air ring cavity can be reduced, the sudden change of gas pressure and speed and the flow dead zone can be effectively solved, the local resistance loss of gas flow is reduced, and uniform and stable pressure of the air ring cavity and the gas ring cavity is obtained.
The sectional areas of the gas nozzle and the air nozzle are gradually increased along the direction far away from the inlet, so that the gas flow attenuation of the nozzle caused by the gradual change of the pressure of the gas annular cavity and the pressure of the air annular cavity can be reasonably adjusted, and the problem of the deviation of the gas flow center is solved.
The combustion reaction in the combustion chamber is more fully carried out, the distribution uniformity of the temperature of the flue gas is good, and the generation of thermal nitrogen oxides is obviously reduced.
The flue gas flow and the temperature are more uniformly distributed on the cross section of the checker brick of the regenerator, the checker brick can store heat more fully, the utilization efficiency is higher, the hot air temperature is effectively improved, and the service life of the hot air furnace is prolonged.
Drawings
FIG. 1 is a schematic view of a top-fired stove with a variable cross-section nozzle burner;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a cross-sectional view B-B of FIG. 1;
FIG. 4 is a cross-sectional view of C-C, D-D, E-E of FIG. 2.
In the figure: 1. a burner; 2. a combustor inner chamber; 3. a gas ring cavity; 4. an air ring cavity; 5. a gas nozzle; 6. a gas inlet; 7. an air inlet; 8. an air nozzle; 9. a burner insulation wall; 10. a combustion chamber; 11. a regenerator.
Detailed Description
The invention discloses a top-burning hot-blast stove with a variable cross-section nozzle burner, which solves the problems of air flow center offset and the like of the existing top-burning hot-blast stove, and aims to realize uniform distribution of an air flow velocity field and a temperature field, improve the heat exchange efficiency of the hot-blast stove and prolong the service life.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1:
the invention provides a top-combustion hot blast stove with a variable cross-section nozzle burner, which comprises a burner 1 at the top, a combustion chamber 10 in the middle and a regenerative chamber 11 at the lower part, as shown in figures 1-3; the combustor 1 comprises a combustor heat insulation wall 9, a combustor inner cavity 2, a coal gas inlet 6, a coal gas annular cavity 3, a coal gas nozzle 5, an air inlet 7, an air annular cavity 4 and an air nozzle 8; the gas inlet 6 is tangentially connected with the gas ring cavity 3; the gas ring cavity 3 is annularly arranged at the upper part of the heat insulation wall 9 of the burner and is communicated with the inner cavity 2 of the burner through a plurality of gas nozzles 5; the air inlet 7 is tangentially connected with the air annular cavity 4; the air ring cavity 4 is annularly arranged at the lower part of the heat insulation wall 9 of the combustor and is communicated with the inner cavity 2 of the combustor through a plurality of air nozzles 8.
When the hot blast stove starts to burn, coal gas tangentially enters the coal gas annular cavity 3 from the coal gas inlet 6, flows around at a high speed along the circumferential direction of the coal gas annular cavity 3 and is filled in the whole coal gas annular cavity 3; the tangential gas inlet of the coal gas can not only reduce the impact of the gas flow of the coal gas inlet 6 on the wall surface of the coal gas annular cavity 3, but also effectively solve the sudden change of the pressure and the speed of the coal gas in the coal gas annular cavity 3 and the flow dead zone, reduce the local resistance loss of the coal gas flow and ensure that the internal pressure distribution of the coal gas annular cavity 3 is relatively balanced; the gas in the gas ring cavity 3 is sprayed into the inner cavity 2 of the burner through the gas nozzle 5. The air inlet 7 also injects air into the burner interior 2 in the same manner. Coal gas and air are respectively and uniformly sprayed out through the coal gas nozzle 5 and the air nozzle 8 and flow and mix around the center of the inner cavity 2 of the combustor in a rotating mode, the mixed gas enters the combustion chamber 10 to be fully combusted and generate high-temperature flue gas, and the utilization efficiency of checker bricks in the regenerator 11 is improved.
Example 2:
as shown in fig. 2 and 3, on the basis of the embodiment 1, the gas flows around the gas ring cavity 3 in a rotating manner, and the pressure of the gas ring cavity 3 slightly changes along the gas flowing direction under the action of the on-way resistance; the gas nozzles 5 are annularly arranged on the outer side of the inner cavity 2 of the combustor, the sectional area of each gas nozzle 5 is gradually enlarged along the direction far away from the gas inlet 6, and the influence of the pressure of the gas annular cavity 3 on the flow of each gas nozzle 5 along the flowing direction of the gas is further improved; the sectional area of the gas nozzle 5 can also be calculated according to the pressure distribution of the gas ring cavity 3; the direction of the gas nozzle 5 and the gas flow direction of the gas ring cavity 3 are not more than 90 degrees, so that the local resistance loss of the gas entering the gas nozzle 5 from the gas ring cavity 3 is reduced. The air nozzles 8 are also arranged on the same principle. Thereby further improving the problem of air flow center deviation in the hot blast stove and enabling the coal gas and the air to be fully mixed and combusted.
Example 3:
as shown in fig. 4, on the basis of embodiment 1 or 2, as shown in fig. 4, the cross section of the gas inlet 6 is changed from a circular section to a rectangular section along the gas flowing direction, and the width of the gas inlet 6 is gradually reduced in the horizontal section and gradually increased in the vertical section. The cross section of the gas inlet 6 is in gradual change type transition from round to rectangular, so that gas can smoothly enter the gas annular cavity 3 through the gas inlet 6; the air inlet 7 is also arranged on the same principle. Further reduce the flow resistance loss of gas, improve the problem of gas flow center skew.
It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.
Claims (7)
1. The utility model provides a take top combustion formula hot-blast furnace of variable cross section nozzle combustor which characterized in that: comprises a burner at the top, a combustion chamber at the middle part and a regenerative chamber at the lower part; the combustor includes combustor heat-proof wall, combustor inner chamber, coal gas entry, coal gas ring chamber, coal gas nozzle, air inlet, air ring chamber, air nozzle, its characterized in that: the gas inlet is tangentially connected with a gas annular cavity, and the gas annular cavity is annularly arranged at the upper part of the heat insulation wall of the burner and is communicated with the inner cavity of the burner through a plurality of gas nozzles; the air inlet is tangentially connected with an air annular cavity, and the air annular cavity is annularly arranged at the lower part of the heat insulation wall of the combustor and is communicated with the inner cavity of the combustor through a plurality of air nozzles.
2. The top-fired hot blast stove with a variable cross-section nozzle burner as claimed in claim 1, characterized in that: the gas nozzle is annularly arranged on the outer side of the inner cavity of the combustor, and the sectional area of the gas nozzle is gradually enlarged along the direction far away from the gas inlet.
3. The top-fired hot blast stove with a variable cross-section nozzle burner as claimed in claim 1, characterized in that: the air nozzle is annularly arranged on the outer side of the inner cavity of the combustor, and the sectional area of the air nozzle is gradually enlarged along the direction far away from the air inlet.
4. The top-fired stove with a variable cross-section nozzle burner according to claim 1 or 2, characterized in that: the direction of the gas nozzle and the gas flow direction of the gas ring cavity are not more than 90 degrees.
5. The top-fired stove with a variable cross-section nozzle burner according to claim 1 or 3, characterized in that: the direction of the air nozzle and the airflow direction of the air ring cavity are not more than 90 degrees.
6. The top-fired hot blast stove with a variable cross-section nozzle burner as claimed in claim 1, characterized in that: the cross section of the coal gas inlet is transited from a circular cross section to a rectangular cross section along the flowing direction of coal gas, the width of the coal gas inlet is continuously reduced in the horizontal direction, and the height of the coal gas inlet is continuously increased in the vertical direction.
7. The top-fired hot blast stove with a variable cross-section nozzle burner as claimed in claim 1, characterized in that: the cross section of the air inlet is changed from a circular cross section to a rectangular cross section along the air flowing direction, the width of the air inlet is continuously reduced in the horizontal direction, and the height of the air inlet is continuously increased in the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110187835.2A CN113046506A (en) | 2021-02-09 | 2021-02-09 | Top combustion hot blast stove with variable cross-section nozzle burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110187835.2A CN113046506A (en) | 2021-02-09 | 2021-02-09 | Top combustion hot blast stove with variable cross-section nozzle burner |
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| Publication Number | Publication Date |
|---|---|
| CN113046506A true CN113046506A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110187835.2A Withdrawn CN113046506A (en) | 2021-02-09 | 2021-02-09 | Top combustion hot blast stove with variable cross-section nozzle burner |
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| CN (1) | CN113046506A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201269526Y (en) * | 2008-08-20 | 2009-07-08 | 北京首钢国际工程技术有限公司 | High-efficiency rotational flow diffusion type combustor of top-burning hot blast stove |
| CN203652424U (en) * | 2013-12-20 | 2014-06-18 | 天津商业大学 | Air supply structure for air channel of refrigerated container |
| EP2821700A1 (en) * | 2013-07-02 | 2015-01-07 | COTRACO Holding GmbH | Lance for combustion or flaring of combustible waste gases |
| CN108662581A (en) * | 2018-05-24 | 2018-10-16 | 姜凤山 | three-dimensional vortex burner |
| WO2019138146A1 (en) * | 2018-01-09 | 2019-07-18 | Orkli, S.Coop. | Mixer device for a gas burner |
-
2021
- 2021-02-09 CN CN202110187835.2A patent/CN113046506A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201269526Y (en) * | 2008-08-20 | 2009-07-08 | 北京首钢国际工程技术有限公司 | High-efficiency rotational flow diffusion type combustor of top-burning hot blast stove |
| EP2821700A1 (en) * | 2013-07-02 | 2015-01-07 | COTRACO Holding GmbH | Lance for combustion or flaring of combustible waste gases |
| CN203652424U (en) * | 2013-12-20 | 2014-06-18 | 天津商业大学 | Air supply structure for air channel of refrigerated container |
| WO2019138146A1 (en) * | 2018-01-09 | 2019-07-18 | Orkli, S.Coop. | Mixer device for a gas burner |
| CN108662581A (en) * | 2018-05-24 | 2018-10-16 | 姜凤山 | three-dimensional vortex burner |
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Application publication date: 20210629 |