CN109207671B - Immersion type desulfurization device with mechanical stirring - Google Patents
Immersion type desulfurization device with mechanical stirring Download PDFInfo
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- CN109207671B CN109207671B CN201811244898.1A CN201811244898A CN109207671B CN 109207671 B CN109207671 B CN 109207671B CN 201811244898 A CN201811244898 A CN 201811244898A CN 109207671 B CN109207671 B CN 109207671B
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- spray gun
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- stirring
- stirrer
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to an immersion desulfurization device with mechanical stirring, which comprises an immersion spray gun and a mechanical stirrer, wherein the immersion spray gun is inserted into a hollow part in the center of the mechanical stirrer and comprises a spray gun flange connecting piece and a spray gun body connected with the spray gun flange connecting piece; the mechanical stirrer comprises a stirrer flange connecting piece, a stirring shaft and stirring blades, wherein the stirrer flange connecting piece is fixedly connected with the stirring shaft, the lower end of the stirring shaft is fixedly connected with the stirring blades, and the stirrer flange connecting piece is used for connecting stirring equipment. The device can ensure that a molten pool obtains full uniform mixing and stirring of the stirrer during immersion type blowing, and the dynamic conditions of the desulfurization process are greatly enhanced by using the dispersion of blowing powder and increasing the retention time.
Description
Technical Field
The invention relates to an immersion type desulphurization device with mechanical stirring, belonging to the technical field of molten iron pretreatment.
Background
Sulphur is one of the main harmful elements in steel products (except sulphur-containing steel), molten iron is used as the main raw material for smelting molten steel, and the components of the molten iron influence the quality of steel to a certain extent. With the continuous improvement of the quality requirements of the steel products in the market, the requirements of the steel products on high strength, low-temperature toughness, cold-working formability and welding performance are more and more strict. To meet this market demand, the steel industry in countries around the world strives to improve the quality of the steel by reducing the sulfur in the steel.
At present, the molten iron desulphurization mainly adopts a mechanical stirring method and a powder spraying method, wherein the mechanical stirring method has the problems of low desulphurization efficiency and serious temperature drop, but has sufficient power; the kinetic conditions of the powder injection method are insufficient, but the desulfurization speed is high and the desulfurization efficiency is high. Because the two methods have advantages and disadvantages, the improvement of the two desulfurization methods has been widely concerned by iron and steel enterprises at home and abroad.
Chinese patent publication No. CN203976850U describes a blowing and stirring combined molten iron pretreatment desulfurization device, which comprises a feeding system, a lifting system and a molten iron containing system, wherein a blowing system, a stirring system and a ladle cover are additionally arranged; the powder spraying stirrer consists of a powder spraying pipe, a protective sleeve and a stirring paddle, wherein the lower end of the powder spraying channel is provided with 2 spraying ports distributed in an inverted V-shaped line, all the parts are tightly connected to form a whole, and the carrier gas is used for spraying powder into molten iron from the powder spraying pipe while stirring, so that the desulfurization rate is increased, and the temperature drop of the molten iron is also reduced. Although the device has the advantages of a mechanical stirring process and a powder spraying process, the whole device is inconvenient to disassemble, and if a part of the device is in a problem, the whole powder spraying stirrer needs to be replaced, so that the cost is relatively high.
Disclosure of Invention
Technical problem to be solved
In order to solve the above problems of the prior art, the present invention provides a submerged desulfurization apparatus with mechanical agitation, which can greatly improve the utilization rate of the dust and can realize deep desulfurization in a short treatment time according to the steel grade.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the immersion type desulfurization device with mechanical stirring comprises an immersion type spray gun and a mechanical stirrer, wherein the immersion type spray gun is inserted into a hollow part in the center of the mechanical stirrer and comprises a spray gun flange connecting piece and a spray gun body connected with the spray gun flange connecting piece, the spray gun flange connecting piece is arranged at the upper end of a spray gun cavity, a powder inlet is arranged in the center of the spray gun flange connecting piece, a cavity is arranged in the center of the spray gun cavity, a spray outlet is arranged at the lower end of the spray gun cavity, the powder inlet is communicated with the cavity of the spray gun cavity and the spray outlet, the spray outlet is positioned at the lower end of the mechanical stirrer, and the spray gun flange connecting piece is used for connecting material conveying equipment;
the mechanical stirrer comprises a stirrer flange connecting piece, a stirring shaft and stirring blades, wherein the stirrer flange connecting piece is fixedly connected with the stirring shaft, the lower end of the stirring shaft is fixedly connected with the stirring blades, and the stirrer flange connecting piece is used for connecting stirring equipment.
In the desulfurization device, the lance flange connector is preferably integrally formed with the lance cavity or is connected together by internal threads and external threads.
Preferably, the spray outlets are provided in a plurality, and the spray outlets are uniformly distributed in the circumferential direction of the tail end of the spray gun cavity.
Preferably, the number of the spray outlets is 2-12.
In the desulfurization apparatus as described above, preferably, the stirring blade includes a plurality of blades uniformly distributed in a circumferential direction of the stirring shaft.
In the above desulfurization device, preferably, the number of the blades is 2 to 12.
In the desulfurization device, the shape of the blade may be square, wave or V-shaped, and when the blade is fixedly connected with the stirring shaft, the blade and the stirring shaft are arranged at an angle of 45-90 °.
In the desulfurization apparatus as described above, preferably, the outer layers of the stirring shaft and the stirring blades are provided with a refractory material layer.
In the desulfurization device, the distance between the outer side wall of the lance body and the hollow inner wall of the center of the stirrer is preferably 2-50 cm.
According to the desulfurization device, preferably, a groove is formed in the inner side wall of the upper end of the stirrer flange connecting piece, the diameter of the groove is larger than the diameter of the spray gun flange connecting piece by 5 cm-10 cm, and the height of the groove is higher than the height of the spray gun flange connecting piece by 3 cm-8 cm, so that the stirrer flange is in butt joint with stirring equipment.
In the molten iron pretreatment process, the powder utilization rate is closely related to the powder floating time, the powder floating time is related to the powder floating path, and the powder floating path in a blowing method can be seen from the outlet of a spray gun to the surface of a ladle, so that the retention time of the powder in the molten iron is short, and the powder is used only once. According to the immersed desulfurization device with the mechanical stirring, the desulfurizer sprayed from the tail end of the spray gun is downward, the molten iron can flow downward due to the stirring energy generated by the mechanical stirring, and the desulfurizer is just driven by the stirring to enter the deep part of the molten iron, so that the floating time of the powder in the molten iron is increased. Therefore, the powder is mechanically stirred while being sprayed, the utilization rate of the powder can be greatly improved, and deep desulfurization can be realized in a short treatment time according to the steel grade.
(III) advantageous effects
The invention has the beneficial effects that:
the immersion desulfurization device with mechanical stirring comprises an immersion spray gun and a mechanical stirring device, wherein the immersion spray gun and the mechanical stirring device are independent and do not interfere with each other; the device can ensure that the molten pool obtains full mixing and stirring of the stirrer during immersion type blowing, utilizes the blowing powder to disperse and increase the retention time, greatly strengthens the dynamic condition of the desulfurization process, has low manufacturing cost, effectively improves the utilization rate of the desulfurizer, and obtains ideal desulfurization effect.
The device is convenient to disassemble and install, convenient to replace and maintain and low in cost.
Drawings
FIG. 1 is a schematic view of a submerged lance;
FIG. 2 is a schematic structural view of a mechanical agitator;
FIG. 3 is a schematic diagram of the structure of a preferred combined mechanical agitation submerged powder injection desulfurization device of the present invention.
[ description of reference ]
1: powder is fed into the inlet;
2: a spray gun flange connection;
3: a mixer flange connection;
4: a stirring shaft;
5: a layer of refractory material;
6: a stirring blade;
7: a powder outlet;
8: the spray gun robbes the body.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Example 1
The utility model provides a take mechanical stirring's immersion desulphurization unit, including immersion spray gun and mechanical agitator, the immersion spray gun inserts the fretwork department at mechanical agitator center, the immersion spray gun includes spray gun flange joint spare 2 and spray gun rifle body 8 as shown in figure 1, spray gun flange joint spare 2 locates the upper end of spray gun cavity 8, but spray gun flange joint spare 2 and spray gun cavity 8 an organic whole form, also can adopt internal thread and external screw thread to link together, the central authorities of spray gun flange joint spare 2 are equipped with powder entry 1, 1 intercommunication spray gun rifle body 8 of powder entry, the central authorities of spray gun cavity 8 are the cavity, be equipped with powder export 7 at the end of spray gun rifle body 8, and spray export 7 is located the lower extreme of mechanical agitator, namely powder entry 1 and spray gun rifle body 8 and powder export 7 intercommunication, spray gun flange joint spare 2 can be with logical spray gun rifle body 8 an organic whole synthetically. The number of the powder outlet 7 can be more than one, and generally 2 to 12 powder outlets can be provided. The powder outlets 7 are evenly distributed in the circumferential direction at the end of the lance body 8. The powder can be uniformly sprayed out and mixed when being sprayed out by uniform arrangement. The spray outlet 7 is located at the lower end of the mechanical stirrer, so that the powder can be easily sprayed out.
As shown in fig. 2, the mechanical stirrer comprises a stirrer flange connecting piece 3, a stirring shaft 4 and stirring blades 6, wherein the stirrer flange connecting piece 3 is fixedly connected with the stirring shaft 4, the lower end of the stirring shaft 4 is fixedly connected with the stirring blades 6, and the stirring blades 6 are composed of 2-12 blades which are uniformly distributed in the circumferential direction of the stirring shaft. The centers of the stirrer flange connecting piece 3 and the stirring shaft 4 are hollowed out and used for penetrating the spray gun body 8,
and a refractory material layer 5 is arranged on the outer layers of the stirring shaft and the stirring blades. The refractory material layer 5 can effectively protect the stirring shaft and the stirring blades, so that the service life of the equipment is prolonged, and the material proportioning ratio of the molten iron cannot be changed.
The shape of the blade can be square, wave or V-shaped, and when the blade is fixedly connected with the stirring shaft, the blade and the stirring shaft are arranged at an angle of 45-90 degrees.
As shown in figure 3, the immersion type spray gun can be drawn out or inserted from the hollow part at the center of the stirrer, the distance between the outer side wall of the spray gun body and the hollow inner wall at the center of the stirrer is 2cm-50cm, no influence on the spray gun is ensured when the stirrer rotates, and the fixed state of the spray gun is kept.
The device can ensure that a molten pool obtains full uniform mixing and stirring of the stirrer during immersion type blowing, greatly strengthens the dynamic conditions of the process, has low manufacturing cost and can obtain the ideal effect of desulfurization.
The spray gun flange connecting piece 2 is arranged at the top of the immersion type spray gun and is used for butting the immersion type spray gun with material conveying equipment.
Stirrer flange connecting piece 3 sets up on mechanical agitator's top, and stirrer flange connecting piece 3's upper end inside wall is equipped with a recess, and the recess diameter is greater than spray gun flange connecting piece 2's diameter 5cm ~ 10cm, highly is higher than spray gun flange connecting piece 2's height 3cm ~ 8cm to guarantee that stirrer flange 3 docks with agitated vessel. The stirrer is connected with the stirring equipment through a flange, the stirring shaft is driven by the stirring equipment to rotate, and the stirring blade is driven to rotate, so that the liquid is in a stirring state.
The treatment process of the device in use comprises the following steps:
the blast furnace molten iron is transported to a steelmaking workshop by a molten iron tank transport vehicle. And then the hot metal ladle is placed on a desulfurization station tipping trolley and is conveyed to a molten iron desulfurization treatment station, the hot metal ladle is poured for a certain angle after entering a slag skimming treatment station to carry out slag skimming, and the hot metal ladle is moved to the desulfurization treatment station after the slag skimming.
And starting a lifting device, descending the stirrer and the spray gun to a position 2-10 cm above the liquid level of molten iron under the control of the PLC and the secondary system, starting a high-pressure gas source, and spraying inert gas.
And opening a charging switch to enable the powder to enter the molten iron through the immersion type spray gun under the driving of the carrier gas.
And starting the stirring device, lowering the mechanical stirrer and the immersion type spray gun to the working position, gradually increasing the rotating speed of the stirrer and the powder spraying speed until the numerical value required by the work is reached, wherein the mechanical stirrer can be lifted up and down in the stirring process, the immersion depth of the immersion type spray gun can be lifted up or lowered down in the desulfurization process, and the highest outlet of the spray gun is lower than the lower edge of the stirrer. The desulfurization treatment is completed within 2-6 minutes.
And when the desulfurization is finished, temperature measurement sampling is carried out, if the sulfur content does not reach a target value, secondary desulfurization operation is carried out, if the sulfur content reaches the target value, the spray gun and the stirrer are drawn out from the molten steel together, the stirrer is rotated, and the phenomenon that slag is solidified between the spray gun and the hollow inner wall of the center of the stirrer is avoided and the stirring head is cleaned is avoided. Stopping rotating the stirrer and blowing after the molten iron is separated,
removing slag, lifting a ladle, and adding molten iron into a converter for steelmaking.
And the whole treatment period is 20-40 minutes, and the molten iron desulphurization process is completed.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (8)
1. The immersion type desulfurization device with the mechanical stirring function is characterized by comprising an immersion type spray gun and a mechanical stirrer, wherein the immersion type spray gun is inserted into a hollow part in the center of the mechanical stirrer and comprises a spray gun flange connecting piece and a spray gun body connected with the spray gun flange connecting piece, the spray gun flange connecting piece is arranged at the upper end of a spray gun cavity, a powder inlet is arranged in the center of the spray gun flange connecting piece, a cavity is arranged in the center of the spray gun cavity, a spray outlet is arranged at the lower end of the spray gun cavity, the powder inlet is communicated with the cavity of the spray gun cavity and the spray outlet, the spray outlet is arranged at the lower end of the mechanical stirrer and is positioned at the tail end of the lower part of the immersion type spray gun, and the immersion type spray gun is positioned at; the spray gun flange connecting piece is used for connecting material conveying equipment; the mechanical stirrer comprises a stirrer flange connecting piece, a stirring shaft and stirring blades, wherein the stirrer flange connecting piece is fixedly connected with the stirring shaft, the lower end of the stirring shaft is fixedly connected with the stirring blades, and the stirrer flange connecting piece is used for connecting stirring equipment;
the spray outlets are arranged in a plurality, and the spray outlets are uniformly distributed in the circumferential direction of the tail end of the spray gun cavity; the inner side wall of the upper end of the stirrer flange connecting piece is provided with a groove, the diameter of the groove is 5 cm-10 cm larger than that of the spray gun flange connecting piece, and the height of the groove is 3 cm-8 cm higher than that of the spray gun flange connecting piece.
2. The mechanically agitated submerged desulfurization apparatus of claim 1, wherein the lance flange connection is integrally formed with the lance cavity or is internally and externally threaded.
3. The mechanically-agitated immersion desulfurization apparatus in accordance with claim 1, wherein 2 to 12 spray outlets are provided.
4. The mechanically-agitated immersion desulfurization apparatus in accordance with claim 1, wherein the agitating blade includes a plurality of blades uniformly distributed in a circumferential direction of the agitating shaft.
5. The mechanically-agitated immersion desulfurization apparatus in accordance with claim 4, wherein 2 to 12 blades are provided.
6. The mechanically-agitated immersion desulfurization apparatus in accordance with claim 4, wherein the shape of the blade is square, wave-shaped or V-shaped, and the blade is disposed at an angle of 45 ° to 90 ° with the stirring shaft when the blade is fixedly connected to the stirring shaft.
7. The mechanically-agitated immersion desulfurization apparatus according to claim 1, wherein the agitating shaft and the outer layer of the agitating blade are provided with a refractory layer.
8. The mechanically-agitated submerged desulfurization apparatus of claim 1, wherein the distance between the outer sidewall of the lance body and the inner wall of the agitator center hollow is set to be 2cm to 50 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244898.1A CN109207671B (en) | 2018-10-24 | 2018-10-24 | Immersion type desulfurization device with mechanical stirring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811244898.1A CN109207671B (en) | 2018-10-24 | 2018-10-24 | Immersion type desulfurization device with mechanical stirring |
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| CN109207671A CN109207671A (en) | 2019-01-15 |
| CN109207671B true CN109207671B (en) | 2020-01-10 |
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| CN201811244898.1A Active CN109207671B (en) | 2018-10-24 | 2018-10-24 | Immersion type desulfurization device with mechanical stirring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110564907A (en) * | 2019-10-14 | 2019-12-13 | 武汉科技大学 | High-efficiency rotary composite spray gun for molten iron desulphurization and application thereof |
| CN110699508B (en) * | 2019-10-31 | 2022-02-01 | 武汉科技大学 | Blowing type spiral stirrer for molten iron desulphurization |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880752A (en) * | 2009-05-07 | 2010-11-10 | 营口东邦冶金设备耐材有限公司 | Pretreating desulfurization/dephosphorization spray gun for molten iron |
| CN102344994A (en) * | 2011-09-22 | 2012-02-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization spray gun |
| CN203256293U (en) * | 2013-04-22 | 2013-10-30 | 南京钢铁股份有限公司 | Molten iron pretreatment device |
| CN104388624A (en) * | 2014-12-04 | 2015-03-04 | 武汉钢铁(集团)公司 | Direct injection molten iron desulphurization spray gun |
| CN206646135U (en) * | 2017-04-25 | 2017-11-17 | 唐山国丰钢铁有限公司 | Steel and iron manufacturing molten iron preprocessing unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003166009A (en) * | 2001-11-28 | 2003-06-13 | Kawasaki Steel Corp | Desulfurization method for molten pig iron |
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- 2018-10-24 CN CN201811244898.1A patent/CN109207671B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880752A (en) * | 2009-05-07 | 2010-11-10 | 营口东邦冶金设备耐材有限公司 | Pretreating desulfurization/dephosphorization spray gun for molten iron |
| CN102344994A (en) * | 2011-09-22 | 2012-02-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization spray gun |
| CN203256293U (en) * | 2013-04-22 | 2013-10-30 | 南京钢铁股份有限公司 | Molten iron pretreatment device |
| CN104388624A (en) * | 2014-12-04 | 2015-03-04 | 武汉钢铁(集团)公司 | Direct injection molten iron desulphurization spray gun |
| CN206646135U (en) * | 2017-04-25 | 2017-11-17 | 唐山国丰钢铁有限公司 | Steel and iron manufacturing molten iron preprocessing unit |
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