CN211471475U - Efficient dephosphorization limestone powder spraying gun device for converter - Google Patents
Efficient dephosphorization limestone powder spraying gun device for converter Download PDFInfo
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- CN211471475U CN211471475U CN202020184724.7U CN202020184724U CN211471475U CN 211471475 U CN211471475 U CN 211471475U CN 202020184724 U CN202020184724 U CN 202020184724U CN 211471475 U CN211471475 U CN 211471475U
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- Prior art keywords
- converter
- limestone powder
- dephosphorization
- powder
- inner diameter
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- 239000000843 powder Substances 0.000 title claims abstract description 80
- 235000019738 Limestone Nutrition 0.000 title claims abstract description 52
- 239000006028 limestone Substances 0.000 title claims abstract description 52
- 238000005507 spraying Methods 0.000 title claims description 19
- 239000007789 gas Substances 0.000 claims abstract description 48
- 239000012159 carrier gas Substances 0.000 claims abstract description 26
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 9
- 235000013312 flour Nutrition 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 229940098458 powder spray Drugs 0.000 claims description 3
- 238000005422 blasting Methods 0.000 claims 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 28
- 229910052742 iron Inorganic materials 0.000 abstract description 14
- 229910000831 Steel Inorganic materials 0.000 abstract description 13
- 239000010959 steel Substances 0.000 abstract description 13
- 238000003723 Smelting Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 210000003437 trachea Anatomy 0.000 abstract description 4
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The utility model discloses a be used for converter high efficiency dephosphorization to spout lime stone powder rifle device, locate the circumferential weld trachea outside the center tube with the cover, the center tube has two air inlets, and one of them air inlet is the carrier gas powder flow entry, and another air inlet is the supplementary gas flow entry, and the air inlet department is kept away from for the internal diameter reducing earlier the reducing structure of back increase to the center tube, is equipped with circumferential weld low temperature protection gas entry on the circumferential weld trachea. The utility model discloses can spout the high pressure of limestone powder into converter molten bath inside and deep, fully contact with the molten iron to with the P contact reaction in the molten iron, and effectively improve the thermodynamics and the kinetic condition of molten bath dephosphorization reaction, thereby improve the dephosphorization rate, shorten the smelting time, improve the steel quality, improve economic benefits. The utility model is suitable for a ferrous metallurgy field.
Description
Technical Field
The utility model belongs to the ferrous metallurgy field relates to a high-efficient dephosphorization device in oxygen converter steelmaking process, specifically speaking is a be used for converter high-efficient dephosphorization to spout limestone flour rifle device.
Background
With the development of society, various industries gradually put higher requirements on the quality of steel, phosphorus in the steel belongs to harmful elements, and the lower the phosphorus content is, the better the service performance of the steel is. Therefore, how to smelt low-phosphorus molten steel in the converter smelting process becomes one of the key issues in the metallurgical field.
In the prior art, the converter dephosphorization process mainly adds lime to make alkaline slag, and firstly blows oxygen to oxidize P element in molten iron into P2O5，P2O5And the lime (CaO) in the slag is combined to form a stable composite phase to form slag, so that the aim of removing the slag is fulfilled.
The key point of the converter dephosphorization is to control the low-temperature environment in a converter molten pool in the smelting process, strengthen the stirring of the molten pool and create good dynamic and thermodynamic conditions for efficient dephosphorization to realize ideal dephosphorization rate and obtain high-quality molten steel. Recent research shows that limestone can be directly added into a converter to be used as a dephosphorizing agent, and the limestone releases a large amount of CO while the heat of desorption in the converter2Not only can properly reduce the temperature of the molten pool, CO2And micro-stirring can be formed in the molten pool, so that the limestone serving as the dephosphorization agent has unique advantages in thermodynamic and kinetic conditions of molten pool dephosphorization reaction. However, at the present stage, the limestone is mainly added directly from the furnace mouth in a block form, and the block limestone cannot be in full contact with molten iron, so that the block limestone cannot be in contact reaction with P in the molten iron, and cannot be used as the raw materialGood dephosphorization effect. For this reason, if limestone is injected into the converter molten bath from the side in the form of powder, it can not only be sufficiently contacted with molten iron to react with P but also improve thermodynamic and kinetic conditions of molten bath dephosphorization reaction, thereby achieving a desired dephosphorization ratio.
Disclosure of Invention
For solving exist among the prior art more than not enough, the utility model aims at providing a be used for converter high efficiency dephosphorization to spout the limestone powder rifle device to reach with the likepowder form from the lateral part high pressure spout into the converter molten bath, improve the purpose of dephosphorization rate.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a be used for converter high efficiency dephosphorization to spout lime stone powder rifle device, locates the circumferential weld trachea outside the center tube with the cover, the center tube has two air inlets, and one of them air inlet is the entry of carrier gas powder flow, and another air inlet is supplementary gas flow inlet, and the air inlet department is kept away from to the center tube for the internal diameter reducing structure that the back increases that reduces earlier, is equipped with circumferential weld low temperature protection gas entry on the circumferential weld trachea.
By way of limitation, the carrier gas powder flow inlet and the auxiliary gas flow inlet are vertically arranged.
By way of further limitation, a mixing control chamber with a spherical cavity is arranged at the communication position of the carrier gas powder flow inlet and the auxiliary gas flow inlet.
As another limitation, the inner diameter of the central tube at the straight tube is 10-40 mm.
As a further limitation, the minimum size of the inner diameter of the reducing structure is 5mm-8mm, and the maximum size of the inner diameter is 40-60 mm.
As still another limitation, the circumferential seam gas tube has an inner diameter width of 1-5 mm.
As the last limitation, the limestone powder spraying gun device for efficiently dephosphorizing the converter is arranged at the middle and lower parts of the converter, and at the position 200-800mm below the horizontal liquid level of the molten pool in the converter, the included angle alpha between the limestone powder spraying gun device and the liquid level of the molten pool in the converter is 30 degrees, and the included angle beta between the limestone powder spraying gun device and the tangent plane of the installation point of the converter lining is 45 degrees.
Since the technical scheme is used, compared with the prior art, the utility model, the beneficial effect who gains lies in:
(1) the utility model discloses can spout the high pressure of limestone flour into converter molten bath inside and deep, fully contact with the molten iron to with the P contact reaction in the molten iron, and release a large amount of CO when limestone flour is in the converter desorption heat2Not only can properly reduce the temperature and CO in the converter molten bath2Micro-stirring can be formed in the molten pool, and thermodynamic and kinetic conditions of molten pool dephosphorization reaction are improved, so that the dephosphorization rate is effectively improved, the smelting time is shortened, the steel quality is improved, and the economic benefit is improved;
(2) the utility model adopts a double-sleeve type reducing structure, which comprises a central tube and a circular seam air tube sleeved outside the central tube, wherein the central tube is provided with two air inlets, one of the air inlets blows in carrier gas powder flow, namely powder spraying carrier gas and limestone powder, and the other air inlet blows in auxiliary shielding gas which has the same component as the powder spraying carrier gas and is low-temperature, and the auxiliary shielding gas reduces the temperature of the powder flow while providing auxiliary power for the powder flow in the central tube, thereby playing the role of low-temperature protection; annular seam low-temperature protective gas is introduced into the annular seam gas pipe, so that the central pipe is further protected at low temperature, the state of powder airflow, namely limestone powder, in the central pipe is ensured at low temperature, and the service life of the whole device is prolonged; the central tube is of a reducing structure with the inner diameter firstly reduced and then increased far away from the air inlet, and powder airflow with higher speed is obtained by utilizing pressure difference change so as to convey limestone powder to the deep part of a converter molten pool;
(3) the carrier gas powder flow inlet and the auxiliary airflow inlet of the utility model are vertically arranged, so that the size and matching effect of two kinds of airflows can be conveniently controlled; a mixing control chamber in a spherical cavity is arranged at the communication position of the carrier gas powder flow inlet and the auxiliary gas flow inlet, and the spherical design can ensure that the carrier gas powder flow and the auxiliary protective gas are fully mixed, thereby reducing unnecessary energy loss;
(4) the inner diameter of the straight pipe of the central pipe is 10-40mm, the minimum dimension of the inner diameter of the reducing structure is 5-8 mm, the maximum dimension of the inner diameter is 40-60mm, and the inner diameter width of the circular seam gas pipe is 1-5mm, so that the central pipe is suitable for the dephosphorization process of an 80-300-ton oxygen converter, the thermodynamic and kinetic conditions of the dephosphorization process in a converter molten pool are improved, the P content of the molten steel at the end point is reduced by about 0.015%, the steel quality is improved, and the economic benefit is improved;
(5) the utility model is arranged at the middle and lower part of the converter, and is positioned at the position of 200 plus 800mm below the horizontal liquid level of the molten pool in the converter, the included angle alpha between the included angle alpha and the liquid level of the molten pool in the converter is 30 degrees, and the included angle beta between the included angle beta and the tangent plane of the installation point of the furnace lining of the converter is 45 degrees, so that the blowing-in direction of the powder flow and the flow of the molten iron in the molten pool of the converter are kept consistent as much as possible, the limestone powder can reach the deep part and;
to sum up, the utility model discloses can spout the high pressure of limestone powder into converter molten bath inside and deep, fully contact with the molten iron to with the P contact reaction in the molten iron, and effectively improve the thermodynamics and the kinetic condition of molten bath dephosphorization reaction, thereby improve the dephosphorization rate, shorten the smelting time, improve steel quality, improve economic benefits. The utility model is suitable for a ferrous metallurgy field.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention;
FIG. 2 is a sectional view of the installation position of the efficient dephosphorization limestone powder spraying gun device for the converter in the embodiment 1 of the invention on the converter;
fig. 3 is a sectional view taken along line a-a of fig. 2.
In the figure: 1. a central tube; 2. circularly sewing the air pipe; 3. a carrier gas powder flow inlet; 4. an auxiliary airflow inlet; 5. a mixing control chamber; 6. a diameter-variable structure; 7. a circumferential seam low temperature shielding gas inlet; 8. and (4) rotating the furnace.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the device for efficiently dephosphorizing and spraying limestone powder for converter described herein is a preferred embodiment, which is only used for illustration and explanation of the present invention, and does not constitute a limitation of the present invention.
The terms or positional relationships in the directions such as "up", "down", "left", "right", etc. according to the present invention are based on the positional relationships in fig. 1 to fig. 3 of the drawings of the present invention, and are only for convenience of description of the present invention and for simplification of description, and are not intended to indicate or imply that a device or element must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation to the contents of the present invention.
Embodiment 1 is used for converter high efficiency dephosphorization to spout limestone flour rifle device
The structure of this embodiment is as shown in fig. 1, and includes a central tube 1 and a circular seam gas tube 2 sleeved outside the central tube 1, two vertical gas inlets are provided on the central tube 1, one of the gas inlets is a carrier gas powder flow inlet 3, the other gas inlet is an auxiliary gas flow inlet 4, a mixing control chamber 5 with a spherical cavity is provided at the communication position of the carrier gas powder flow inlet 3 and the auxiliary gas flow inlet 4, a diameter-changing structure 6 with an inner diameter that is first reduced and then increased is provided at the position of the central tube far from the gas inlets, and a circular seam low-temperature protective gas inlet 7 is provided on the circular seam gas.
In the embodiment, a double-sleeve type reducing structure is adopted, carrier gas powder flow, namely limestone powder and powder spraying carrier gas, is blown in through a carrier gas powder flow inlet 3 of a central tube 1, the particle size of the sprayed limestone powder is 0.5-1.5mm, the powder spraying carrier gas can be nitrogen, carbon dioxide or argon, auxiliary shielding gas is introduced through an auxiliary gas flow inlet 4 of the central tube 1, the auxiliary shielding gas and the powder spraying carrier gas have the same components, but low temperature is adopted, the carrier gas powder flow introduced through the carrier gas powder flow inlet 3 and the auxiliary shielding gas introduced through the auxiliary gas flow inlet 4 are mixed in a mixing control chamber 5, and the auxiliary shielding gas provides auxiliary power for the powder conveying gas flow of the central tube 1 and reduces the temperature of the powder flow at the same time, so that the low-temperature; the central tube 1 is provided with a reducing structure 6 with the inner diameter firstly reduced and then increased at the position far away from the air inlet, and carrier gas powder flow with higher speed is obtained by utilizing pressure difference change so as to convey limestone powder to the deep part of a converter molten pool; the circumferential seam low-temperature protective gas is blown in through the circumferential seam low-temperature protective gas inlet 7 on the circumferential seam gas pipe 2, the circumferential seam low-temperature protective gas can be nitrogen, the central pipe 1 is further protected at low temperatureNot only ensures the state of the powder airflow, namely limestone powder, in the central tube 1, but also prolongs the service life of the whole device. The embodiment can ensure that the limestone powder is in full contact with the molten iron in the molten pool of the converter so as to be in contact reaction with P in the molten iron, and the limestone powder releases a large amount of CO while absorbing heat in the converter2Not only can properly reduce the temperature of the molten pool, CO2And micro-stirring can be formed in the molten pool, and thermodynamic and kinetic conditions of molten pool dephosphorization reaction are improved, so that the dephosphorization rate is effectively improved, the smelting time is shortened, the steel quality is improved, and the economic benefit is improved. In addition, because the temperature of a molten pool in the converter is generally between 1300 and 1600 ℃, limestone powder can absorb heat and decompose instantly when entering the molten pool, thereby reducing the peripheral temperature of the spray gun head in the high-efficiency dephosphorization limestone powder spray gun device, avoiding the damage of the spray gun head due to high temperature caused by long-time use, playing a role in protecting the spray gun head and further prolonging the service life of the spray gun head.
The inner diameter of the straight pipe of the central pipe 1 is 10-40mm, the inner diameter of the straight pipe of the central pipe 1 is preferably 25mm in the embodiment, the inner diameter of the circular seam gas pipe 2 is 1-5mm in width, the inner diameter of the circular seam gas pipe 2 is preferably 3mm in the embodiment, the minimum size of the inner diameter of the reducing structure 6 is 5mm-8mm, the minimum size of the inner diameter is preferably 6mm in the embodiment, the maximum size of the inner diameter is 40-60mm in the embodiment, the maximum size of the inner diameter is preferably 50mm in the embodiment, the efficient dephosphorization limestone powder spraying gun device is suitable for the dephosphorization process of an 80-300-ton oxygen converter, the preferable size value of the embodiment is suitable for a 150-ton oxygen converter type, the P content of the molten steel at the end point is reduced by about 0.
As shown in fig. 2 and fig. 3, the efficient dephosphorization limestone powder injection lance device is installed at the middle and lower part of the converter 7, 200-800mm below the horizontal liquid level of the molten pool in the converter, and 500mm below the horizontal liquid level of the molten pool in the converter at the optimal position; the included angle alpha between the slag line and the liquid level of a molten pool in the converter is 30 degrees, the included angle beta between the slag line and the tangent plane of the installation point of the lining of the converter is 45 degrees, limestone powder is guaranteed to reach the deep part and the inner part of molten steel in the converter, and dephosphorization efficiency is guaranteed.
The application process of this embodiment is as follows:
blowing the sieved and ground limestone powder into the reaction kettle by high-pressure carrier gasThe carrier gas powder flows into the inlet 1, the powder spraying flow is 25-100kg/min, the powder spraying time is determined according to the oxygen blowing smelting process of the converter, generally 15min, the particle size of the sprayed limestone powder is 0.5-1.5mm, and simultaneously the flow velocity of the carrier gas in the pipeline is ensured to be larger than the critical fluidization velocity of the limestone powder to prevent the powder state from changing; in order to ensure the speed of the powder flow in the transportation process, auxiliary protective gas is applied through the auxiliary gas flow inlet 4, and the flow rate of the auxiliary protective gas is 300-500Nm3The pressure is 0.5-1.0 MPa; the two are mixed in a middle mixing control chamber 5 and then enter the middle part of the high-efficiency dephosphorization limestone powder spraying gun device; simultaneously, annular seam low-temperature protective gas is blown in through an annular seam low-temperature protective gas inlet 7 on the annular seam gas pipe 2, and the annular seam gas flow is 50-500Nm3The pressure is 0.5-1.0 MPa; when the powder airflow approaches the head of the spray gun, the inner diameter is firstly reduced and then increased, so that the powder airflow is compressed and then released, the powder airflow obtains higher impact velocity, and the powder airflow is directly sprayed into a high-temperature molten iron molten pool to complete subsequent reaction and operation.
Claims (8)
1. The utility model provides a be used for converter high efficiency dephosphorization to spout limestone flour rifle device which characterized in that: the central tube is provided with two air inlets, one of the two air inlets is a carrier gas powder flow inlet, the other air inlet is an auxiliary gas flow inlet, the position, far away from the air inlet, of the central tube is of a reducing structure with the inner diameter being reduced firstly and then increased, and the circular seam air tube is provided with a circular seam low-temperature protective gas inlet.
2. The efficient dephosphorization limestone powder blasting device for the converter according to claim 1, which is characterized in that: the carrier gas powder flow inlet and the auxiliary gas flow inlet are vertically arranged.
3. The efficient dephosphorization limestone powder blasting device for the converter according to claim 2, which is characterized in that: and a mixing control chamber with a spherical cavity is arranged at the communication position of the carrier gas powder flow inlet and the auxiliary gas flow inlet.
4. The apparatus of the limestone powder spray gun for efficient dephosphorization of a converter according to any one of claims 1 to 3, wherein: the inner diameter of the straight pipe of the central pipe is 10-40 mm.
5. The efficient dephosphorization limestone powder blasting device for the converter according to claim 4, which is characterized in that: the minimum size of the inner diameter of the reducing structure is 5mm-8mm, and the maximum size of the inner diameter is 40-60 mm.
6. The apparatus of the limestone powder blasting gun for efficient dephosphorization of a converter according to any one of claims 1 to 3 and 5, wherein: the inner diameter width of the circular seam air pipe is 1-5 mm.
7. The efficient dephosphorization limestone powder blasting device for the converter according to claim 4, which is characterized in that: the inner diameter width of the circular seam air pipe is 1-5 mm.
8. The apparatus of the limestone powder spray gun for efficient dephosphorization of the converter according to any one of claims 1 to 3, 5 and 7, wherein: the limestone powder spraying gun device for efficiently dephosphorizing the converter is arranged at the middle and lower parts of the converter, the included angle alpha between the limestone powder spraying gun device and the liquid surface of a molten pool in the converter is 30 degrees and the included angle beta between the limestone powder spraying gun device and the tangent plane of the installation point of the converter lining is 45 degrees at the position 200-800mm below the horizontal liquid surface of the molten pool in the converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020184724.7U CN211471475U (en) | 2020-02-19 | 2020-02-19 | Efficient dephosphorization limestone powder spraying gun device for converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020184724.7U CN211471475U (en) | 2020-02-19 | 2020-02-19 | Efficient dephosphorization limestone powder spraying gun device for converter |
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| Publication Number | Publication Date |
|---|---|
| CN211471475U true CN211471475U (en) | 2020-09-11 |
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|---|---|---|---|
| CN202020184724.7U Expired - Fee Related CN211471475U (en) | 2020-02-19 | 2020-02-19 | Efficient dephosphorization limestone powder spraying gun device for converter |
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| Country | Link |
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| CN (1) | CN211471475U (en) |
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- 2020-02-19 CN CN202020184724.7U patent/CN211471475U/en not_active Expired - Fee Related
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Granted publication date: 20200911 |