CN216891064U - KR desulfurization equipment for molten iron pretreatment - Google Patents
KR desulfurization equipment for molten iron pretreatment Download PDFInfo
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- CN216891064U CN216891064U CN202123269835.1U CN202123269835U CN216891064U CN 216891064 U CN216891064 U CN 216891064U CN 202123269835 U CN202123269835 U CN 202123269835U CN 216891064 U CN216891064 U CN 216891064U
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Abstract
The utility model relates to KR desulfurization equipment for molten iron pretreatment.A gas station is arranged on one side of a steel shell; the gas station is connected with one end of the gas guide pipe; the other end of the air duct is connected to one side of the steel shell close to the bottom; molten iron is contained in a steel shell with a refractory material layer inside, a desulfurizer is placed on the molten iron, nitrogen generated by a gas station is blown into the molten iron through a gas guide pipe to generate internal vortex, and meanwhile, a stirring paddle arranged in the molten iron is used for stirring the molten iron to assist in desulfurization; the KR desulfurization equipment for the molten iron pretreatment has the advantages of high desulfurization efficiency, short desulfurization time and less desulfurizer consumption.
Description
Technical Field
The utility model belongs to the field of molten iron pretreatment in steel smelting, and relates to KR desulfurization equipment, in particular to KR desulfurization equipment for molten iron pretreatment.
Background
Sulphur is one of the harmful elements in steel, and the main hazards are: resulting in hot embrittlement of the steel and anisotropy of the rolled steel, the sulphur content in the steel must be strictly limited. In particular, for high value added steel such as electrical silicon steel and IF steel, the requirement for sulfur content is more severe.
The molten iron is desulfurized through pretreatment, and the desulfurization treatment before the molten iron enters a converter is mainly referred to in steel-making production. The pretreatment of molten iron in a broad sense means three-step removal treatment including desulfurization, desiliconization and dephosphorization of molten iron, and in addition, pretreatment of special molten iron, such as vanadium extraction of vanadium-containing molten iron, and the like.
The main advantages of molten iron desulphurization are as follows:
1. the molten iron contains a large amount of silicon, carbon, manganese and other reductive elements, and when various desulfurizing agents are used, the burning loss of the desulfurizing agents is less, the utilization rate is high, and the desulfurizing agent is favorable for desulfurization.
2. The carbon and silicon in the molten iron can greatly improve the activity coefficient of the sulfur in the molten iron, improve the thermodynamic condition of desulfurization and enable the sulfur to be easily removed to a lower level.
3. The oxygen content in the molten iron is low, the distribution coefficient of sulfur in the slag iron is improved, and the desulfurization is facilitated.
4. The low temperature of the molten iron treatment makes the service life of the refractory material and the treatment device higher.
5. The cost of molten iron desulphurization is low, for example, one kilogram of sulfur is removed in a blast furnace, a converter and an external refining device, and the cost is respectively 2.6, 16.9 and 6.1 times of that of the molten iron desulphurization.
The change of molten iron components in the process of molten iron external desulfurization has less influence on the final steel grade components than the change of molten steel components in the process of steel making or molten steel external treatment.
By using molten iron desulphurization, the burden of the blast furnace can be reduced, the coke ratio can be reduced, the slag quantity can be reduced, the productivity can be improved, and the converter does not need to adopt large-slag-quantity high-alkalinity operation for desulphurization because the desulphurization is quite difficult under the condition of high-oxidizing slag of the converter. Therefore, molten iron desulphurization becomes an important means for optimizing the process flow in the modern steel industry, and is a main measure for improving the quality of steel and expanding the variety.
There are many early methods of hot metal desulfurization: for example, the desulfurizing agent is directly added at the bottom of the hot metal ladle and mixed by the impact of the iron flow to desulfurize. There is also a ladle shaking method in which a desulfurizing agent is added to a hot-metal ladle containing molten iron, and then the hot-metal ladle is eccentrically rotated or alternately rotated in the forward and reverse directions. Then, the KR stirring method and the blowing method of inserting the spray gun into the molten iron adopted today are gradually developed.
However, the KR stirring method is mainly based on the principle that the desulfurizing agent is added to the surface of molten iron and then stirred and desulfurized by a stirring paddleThe sulfur in the molten iron is removed by contacting the desulfurizing agent with the surface of the molten iron, but the specific gravity of the molten iron reaches 7.8 tons/m3Only by the stirring paddle, the stirring effect is poor, so that the desulfurization efficiency is low, the desulfurization time is long, the consumption of a desulfurizer is high, and the economic efficiency is poor on the whole.
Therefore, how to improve the stirring effect of molten iron, reduce the pretreatment desulfurization time, reduce the consumption of a desulfurizing agent and reduce the treatment cost is particularly important, and the utility model provides a solution. .
SUMMERY OF THE UTILITY MODEL
An object of an embodiment of the present invention is to provide KR desulfurization equipment for molten iron pretreatment, which has high desulfurization efficiency, short desulfurization time, and a small amount of a desulfurizing agent.
In order to achieve the above object, an embodiment of the present invention provides KR desulfurization equipment for molten iron pretreatment, including: the device comprises a gas station, a gas guide pipe, a desulfurizing agent, a steel shell, a stirring paddle, a refractory material layer and molten iron;
the gas station is arranged on one side of the steel shell; the gas station is connected with one end of the gas guide pipe; the other end of the air duct is connected to one side of the steel shell close to the bottom;
the molten iron is placed in the steel shell with the refractory material layer inside, the desulfurizer is placed on the molten iron, nitrogen generated by the gas station is blown into the molten iron through the gas guide tube to generate internal vortex, and meanwhile, the stirring paddle arranged in the molten iron is used for stirring the molten iron to assist in desulfurization.
Furthermore, the inner diameter of the air duct is 1-10 mm.
Further, the thickness of the desulfurizer is 10-200 mm.
Furthermore, the stirring paddle is in a cross shape.
Furthermore, a rotary driving device is arranged above the stirring paddle and drives the stirring paddle to rotate.
Compared with the prior art, the embodiment of the utility model,compare with traditional KR desulfurization mode, introduce side gas station and air duct, the introduction of gas station and air duct, can blow in the molten iron through the high-pressure nitrogen gas of air duct in with the gas station, on traditional basis of going on stirring to the molten iron through the stirring rake, because of increased the high-pressure gas side blow stirring, make the stirring effect of molten iron strengthen greatly, accelerated the stirring of molten iron, make the area of contact of molten iron and desulfurizer increase, contact time accelerates. Therefore, the pretreatment time of the molten iron is obviously reduced, the using amount of the desulfurizer can be greatly reduced, the desulfurization efficiency is improved, the temperature drop of the molten iron is reduced, and the cost of the final process is reduced. Solves the problem that the prior KR stirring method only carries out stirring desulfurization by a stirring paddle after a desulfurizing agent is added on the surface of molten iron, and the main principle is that the desulfurizing agent is contacted with the surface of the molten iron to remove sulfur in the molten iron, but the specific gravity of the molten iron reaches 7.8 tons/m3The stirring effect is poor only by the stirring paddle, so that the desulfurization efficiency is low, the desulfurization time is long, the consumption of the desulfurizer is high, and the economic efficiency is poor on the whole.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic top view of the steel shell and refractory layer of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.
An embodiment of the present invention relates to KR desulfurization equipment for hot metal pretreatment, as shown in fig. 1 and 2, including: the device comprises a gas station 1, a gas guide pipe 2, a desulfurizer 3, a steel shell 4, a stirring paddle 5, a refractory material layer 6, molten iron 7 and a rotary driving device 8;
the gas station 1 is arranged at one side of the steel shell 4; the gas station 1 is connected with one end of a gas guide tube 2; the other end of the air duct 2 is connected to one side of the steel shell 4 close to the bottom; the gas station 1 is used for providing high-pressure nitrogen gas, and the nitrogen gas is mainly used for protecting the molten iron 7.
Compare with traditional KR desulfurization mode, introduce gas station 1 and air duct 2 of side-blown, the introduction of gas station 1 and air duct 2, can blow in molten iron 7 through air duct 2 with the high-pressure nitrogen gas in the gas station, on the traditional basis that carries out the stirring to molten iron 7 through stirring rake 5, because of increased the high-pressure gas side-blown stirring, make the stirring effect of molten iron 7 strengthen greatly, the stirring of molten iron 7 has been accelerated, make the area of contact increase of molten iron 7 and desulfurizer 3, contact time accelerates. Therefore, the pretreatment time of the molten iron is obviously reduced, the using amount of a desulfurizing agent can be greatly reduced, the desulfurizing efficiency is improved, the temperature drop of the molten iron is reduced, and the cost of the final process is reduced. Solves the problem that the prior KR stirring method only carries out stirring desulfurization by a stirring paddle after a desulfurizer 3 is added to the surface of molten iron 7, and the main principle is that the desulfurizer 3 is contacted with the surface of the molten iron 7 to remove sulfur in the molten iron, but the specific gravity of the molten iron 7 reaches 7.8 tons/m3Only by the stirring paddle 5, the stirring effect is poor, so that the desulfurization efficiency is low, the desulfurization time is long, the consumption of the desulfurizer 3 is high, and the economic efficiency is poor on the whole.
In a KR desulfurization facility for pretreating molten iron in an embodiment of the present invention, the inner diameter of the gas-guide tube 2 is 1 to 10 mm. The thickness of the desulfurizer 3 is 10-200 mm. The stirring paddle 5 is in a cross shape, and the rotary driving device 8 is arranged above the stirring paddle 5 and drives the stirring paddle 5 to rotate.
With the KR desulfurization equipment for molten iron preliminary treatment in this embodiment be used for domestic some 250 tons KR desulfurization stations to carry out desulfurization test, 10 stoves of each group of embodiment field test are compared with its present desulfurization condition simultaneously, and the effect is as shown in following table 1:
TABLE 1 comparison of the results of use in the case of different examples
From the above embodiments, it can be seen that, the KR desulfurization equipment for molten iron pretreatment in this embodiment has the characteristics of high desulfurization efficiency, short desulfurization time, small usage amount of the desulfurizing agent, and the like, and the desulfurization efficiency can reach over 98%, and the content of sulfur in molten iron can be reduced to below 0.001%, thereby providing basic conditions for smelting high-quality steel.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the utility model, and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model in practice.
Claims (5)
1. The utility model provides a KR desulfurization equipment for molten iron pretreatment which characterized in that includes: the device comprises a gas station, a gas guide pipe, a desulfurizing agent, a steel shell, a stirring paddle, a refractory material layer and molten iron;
the gas station is arranged on one side of the steel shell; the gas station is connected with one end of the gas guide pipe; the other end of the air duct is connected to one side of the steel shell close to the bottom;
the molten iron is placed in the steel shell with the refractory material layer inside, the desulfurizer is placed on the molten iron, nitrogen generated by the gas station is blown into the molten iron through the gas guide tube to generate internal vortex, and meanwhile, the stirring paddle arranged in the molten iron is used for stirring the molten iron to assist in desulfurization.
2. The KR desulfurization apparatus for molten iron pretreatment according to claim 1, wherein the inner diameter of the gas conduit is 1-10 mm.
3. The KR desulfurization apparatus for molten iron pretreatment according to claim 1, wherein the thickness of the desulfurizing agent is 10-200 mm.
4. The KR desulfurization device for molten iron pretreatment of claim 1, wherein the stirring blade is cross-shaped.
5. The KR desulfurization device for molten iron pretreatment of claim 4, wherein a rotation driving device is arranged above the stirring paddle to drive the stirring paddle to rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123269835.1U CN216891064U (en) | 2021-12-23 | 2021-12-23 | KR desulfurization equipment for molten iron pretreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123269835.1U CN216891064U (en) | 2021-12-23 | 2021-12-23 | KR desulfurization equipment for molten iron pretreatment |
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| Publication Number | Publication Date |
|---|---|
| CN216891064U true CN216891064U (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123269835.1U Active CN216891064U (en) | 2021-12-23 | 2021-12-23 | KR desulfurization equipment for molten iron pretreatment |
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| CN (1) | CN216891064U (en) |
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2021
- 2021-12-23 CN CN202123269835.1U patent/CN216891064U/en active Active
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