CN105710348A - Device and method for removing inclusions by refining bubbles - Google Patents
Device and method for removing inclusions by refining bubbles Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007670 refining Methods 0.000 title claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 83
- 239000010959 steel Substances 0.000 claims abstract description 83
- 238000007664 blowing Methods 0.000 claims abstract description 32
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000011449 brick Substances 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 18
- 238000007667 floating Methods 0.000 description 12
- 229910052786 argon Inorganic materials 0.000 description 9
- 238000000746 purification Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000725 suspension Chemical group 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- -1 automotive sheet Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
一种细化气泡去除夹杂物装置及方法，包括盛钢桶、电磁制动磁场发生器和电磁搅拌器；盛钢桶侧面设有电磁制动磁场发生器，盛钢桶底部透气砖外围设置电磁搅拌器。将盛有钢水盛钢桶放置在两套电磁制动磁场发生器之间，并将电磁搅拌器安装在盛钢桶底部透气砖外围。在开启吹气阀后，启动电磁搅拌器和电磁制动磁场，通过电磁搅拌，使透气砖附近钢水流动速度加快，有助于小气泡的产生；通过电磁制动磁场发生器抑制容器中、上部钢水的流动速度，延长气泡停留时间。当钢水中小尺寸夹杂物含量达到要求后停止吹气，关闭电磁制动磁场发生器和电磁搅拌器。本发明可提高气泡捕捉＜5μm夹杂物的效率，减少钢水温降和吹气总量，节约能源和资源。
A device and method for removing inclusions by refining air bubbles, comprising a steel drum, an electromagnetic braking magnetic field generator, and an electromagnetic stirrer; the side of the steel drum is provided with an electromagnetic braking magnetic field generator, and the periphery of the breathable brick at the bottom of the steel drum is provided with an electromagnetic mixer. A steel drum filled with molten steel is placed between two sets of electromagnetic braking magnetic field generators, and an electromagnetic stirrer is installed on the periphery of the breathable brick at the bottom of the steel drum. After opening the blowing valve, start the electromagnetic stirrer and the electromagnetic braking magnetic field. Through electromagnetic stirring, the molten steel flow speed near the breathable brick will be accelerated, which will help the generation of small bubbles; the electromagnetic braking magnetic field generator will suppress the middle and upper parts of the container. The flow speed of molten steel prolongs the residence time of bubbles. When the content of small-sized inclusions in molten steel reaches the requirement, stop blowing, and turn off the electromagnetic brake magnetic field generator and electromagnetic stirrer. The invention can improve the efficiency of air bubbles capturing inclusions of less than 5 μm, reduce the temperature drop of molten steel and the total amount of gas blowing, and save energy and resources.
Description
技术领域technical field
本发明属于电磁冶金和炼钢领域，特别涉及一种通过细化气泡去除钢液中夹杂物的装置及方法。The invention belongs to the fields of electromagnetic metallurgy and steelmaking, and in particular relates to a device and method for removing inclusions in molten steel by refining air bubbles.
背景技术Background technique
为了提供比以前更具有高性能、高可信度的钢材产品，目前许多钢铁产品，如汽车用薄板、钢帘线、电工用钢等需要不断提高其最终产品的洁净度水平。夹杂物是危害钢液、钢材质量的主要杂质，尽可能多的去除夹杂物是炼钢的主要目标之一。在众多去除夹杂物的方法中，气泡上浮法被认为是最有发展前景的，这是由于一些有害夹杂物如Al2O3具有较大的接触角，容易被气泡捕捉。In order to provide steel products with higher performance and high reliability than before, many steel products such as automotive sheet, steel cord, and electrical steel need to continuously improve the cleanliness level of the final product. Inclusions are the main impurities that endanger the quality of molten steel and steel, and removing as many inclusions as possible is one of the main goals of steelmaking. Among the many methods for removing inclusions, the bubble flotation method is considered to be the most promising, because some harmful inclusions such as Al 2 O 3 have a large contact angle and are easily captured by air bubbles.
在喷气净化过程中，弥散分布的细小气泡是提高精炼效率的重要条件。有学者进行了水模试验，结果表明在偏心搅拌模式下能促进气泡在熔池内的细化和分散，但搅拌方式为机械搅拌。机械搅拌钢液时搅拌器在高温钢水中易腐蚀损坏，因而在实际生产中应用较少。In the jet purification process, the fine air bubbles dispersedly distributed is an important condition to improve the refining efficiency. Some scholars have carried out water model tests, and the results show that the refinement and dispersion of bubbles in the molten pool can be promoted under the eccentric stirring mode, but the stirring method is mechanical stirring. When the molten steel is mechanically stirred, the stirrer is easily corroded and damaged in the high-temperature molten steel, so it is rarely used in actual production.
气泡携带夹杂物上浮的整个过程分析前人已经进行了研究报道。整个过程至少需要三个步骤：靠近过程；碰撞并粘附过程；夹杂物和气泡一起上浮去除过程。气泡上浮速度过快，在相同的条件下所能吸附和带走去除的夹杂物数量相对会减少。如果能够降低气泡上浮速度，则可以让夹杂物有更充分的时间靠近气泡，同时，与气泡粘附在一起的夹杂物也不容易脱落，这样有利于提高去除夹杂物的效率。当去除效率提高后，吹较少的气体即可达到相同的效果，可以节约气体(如N2、Ar等)，减少钢包热量损失。同时，气泡上浮速度慢，有助于对较小尺寸夹杂物(<5μm)的去除。The analysis of the whole process of bubbles carrying inclusions up to the surface has been reported by previous researchers. The whole process requires at least three steps: the process of approaching; the process of collision and adhesion; the process of removing inclusions and air bubbles together. If the bubbles float too fast, the number of inclusions that can be adsorbed and removed under the same conditions will be relatively reduced. If the floating speed of the bubbles can be reduced, the inclusions can have more time to approach the bubbles, and at the same time, the inclusions adhering to the bubbles are not easy to fall off, which is conducive to improving the efficiency of removing inclusions. When the removal efficiency is improved, the same effect can be achieved by blowing less gas, which can save gas (such as N2, Ar, etc.) and reduce the heat loss of the ladle. At the same time, the floating speed of bubbles is slow, which is helpful for the removal of small-sized inclusions (<5μm).
钢包底吹氩用透气砖平均孔径为2～4mm在常用的吹氩流量范围内产生的气泡直径为10～20mm。并且气泡在上浮过程中会迅速膨胀。因此底吹氩产生的气泡捕获小颗粒夹杂物的概率很小。而有效去除夹杂物的最佳气泡直径为2～15mm。为了去除钢中细小夹杂物，可以将氩气引入到足够湍流强度的钢液中，依靠湍流产生的剪切力将气泡打碎，将大气泡击碎为小气泡。同时气泡上浮速度过快也不利于夹杂物的去除，因而若能抑制钢包中、上部钢水由于气泡上浮引起的流动速度，则可以让气泡在钢水中停留的时间延长，夹杂物有更多的时间向气泡靠近或被吸附去除。The average pore diameter of the permeable bricks for argon blowing at the bottom of the ladle is 2-4mm, and the diameter of the bubbles generated within the commonly used flow range of argon blowing is 10-20mm. And the bubbles will expand rapidly during the floating process. Therefore, the bubbles generated by bottom blowing argon have little probability of trapping small particle inclusions. The optimum bubble diameter for effectively removing inclusions is 2-15mm. In order to remove small inclusions in steel, argon gas can be introduced into molten steel with sufficient turbulent flow strength, and the shear force generated by turbulent flow can be used to break the bubbles and break the big bubbles into small bubbles. At the same time, if the bubbles rise too fast, it is not conducive to the removal of inclusions. Therefore, if the flow velocity of the molten steel in the middle and upper part of the ladle is suppressed due to the bubbles rising, the bubbles can stay in the molten steel for a longer time, and the inclusions have more time. Close to the bubbles or be removed by adsorption.
发明内容Contents of the invention
本发明的目的是提供一种既能在钢水中产生小气泡，同时又能降低钢水中气泡上浮速度，提高去除＜5μm夹杂物效率的装置及方法，以减少钢水温降和吹气总量，节约能源和资源。The purpose of the present invention is to provide a device and method that can not only generate small bubbles in molten steel, but also reduce the floating speed of bubbles in molten steel, and improve the efficiency of removing inclusions <5 μm, so as to reduce the temperature drop of molten steel and the total amount of air blowing. Save energy and resources.
为此，本发明所采取的解决方案是：For this reason, the solution that the present invention takes is:
一种细化气泡去除夹杂物装置，其特征在于，包括盛钢容器、电磁制动磁场发生器和电磁搅拌器；盛钢容器侧面设有电磁制动磁场发生器，盛钢容器底部透气砖外围设置电磁搅拌器；电磁制动磁场发生器包括箱体、制动线圈、制动铁芯及吊环；电磁搅拌器由壳体、搅拌铁芯及搅拌线圈组成，所述搅拌铁芯磁轭垂直于磁背上表面，搅拌铁芯外缠绕有搅拌线圈。A device for removing inclusions by refining air bubbles, which is characterized in that it includes a steel container, an electromagnetic brake magnetic field generator and an electromagnetic stirrer; An electromagnetic stirrer is set; the electromagnetic brake magnetic field generator includes a box body, a brake coil, a brake iron core and a suspension ring; the electromagnetic stirrer is composed of a shell, a stirring iron core and a stirring coil, and the magnetic yoke of the stirring iron core is perpendicular to the On the upper surface of the magnetic back, a stirring coil is wound outside the stirring iron core.
一种细化气泡去除夹杂物的方法，其特征在于：A method for refining air bubbles to remove inclusions, characterized in that:
1、将冶炼温度1550～1650℃的钢水倒入具有底吹或顶底复合吹气装置的盛钢容器中。1. Pour molten steel with a smelting temperature of 1550-1650°C into a steel container with bottom blowing or top-bottom composite blowing device.
2、将盛钢容器放置在两套电磁制动磁场发生器之间，电磁制动磁场发生器的两个磁轭距离钢包中部侧壁50～200mm，并将电磁搅拌器铁芯端部靠近盛钢容器底部安装在盛钢容器底部透气砖外围。2. Place the Shenggang container between two sets of electromagnetic braking magnetic field generators. The distance between the two magnetic yokes of the electromagnetic braking magnetic field generator The bottom of the steel container is installed on the periphery of the air brick at the bottom of the Shenggang container.
3、在开启吹气阀后，启动电磁搅拌器和电磁制动磁场，控制电磁搅拌频率为1～50Hz，钢水位置处的磁感应强度达到0.005～0.2T，透气砖附近的钢液流速在0.2～3m/min；透气砖附近钢水流动速度加快，有助于小气泡的产生，提高净化的效率。3. After opening the blowing valve, start the electromagnetic stirrer and the electromagnetic braking magnetic field, control the electromagnetic stirring frequency to 1-50Hz, the magnetic induction intensity at the position of molten steel reaches 0.005-0.2T, and the flow rate of molten steel near the breathable brick is 0.2- 3m/min; the flow speed of molten steel near the permeable brick is accelerated, which is conducive to the generation of small air bubbles and improves the efficiency of purification.
电磁制动磁场发生器控制钢液中心部位的磁感应强度在0.005～0.5T，将钢水的流动速度降低为无电磁制动时的50％以下。通过电磁制动磁场发生器抑制容器中、上部钢水由于气泡上浮产生的流动速度，这可以延长气泡在钢水中的停留时间，气泡上浮速度慢，让夹杂物有足够的时间向气泡靠近和被吸附，从而提高去除夹杂物的效率。The electromagnetic brake magnetic field generator controls the magnetic induction intensity at the center of the molten steel to be 0.005-0.5T, and reduces the flow speed of the molten steel to less than 50% of that without electromagnetic brake. The flow velocity of the molten steel in the upper part of the container due to the floating of the bubbles is suppressed by the electromagnetic brake magnetic field generator, which can prolong the residence time of the bubbles in the molten steel, and the floating speed of the bubbles is slow, so that the inclusions have enough time to approach and be absorbed by the bubbles , thereby increasing the removal efficiency of inclusions.
4、吹气一定时间钢水满足浇铸条件后，停止吹气，关闭电磁制动磁场发生器和电磁搅拌器，出钢浇铸。4. After blowing air for a certain period of time, after the molten steel meets the casting conditions, stop blowing, turn off the electromagnetic brake magnetic field generator and electromagnetic stirrer, and tap the steel for casting.
所述盛钢容器为坩埚或钢包。The steel holding container is a crucible or a ladle.
吹气净化钢液时，吹气时间的长短、单位时间吹气量等会直接影响净化效果。吹气时间的延长和单位时间吹气量的增加固然可以提高净化效果，但这会增加钢液的温降和吹氮总量，造成能源和资源的浪费，同时还可能影响生产的正常进行。若加速透气砖附近的钢水的流速，则在钢水剪切的作用下，气泡的直径将会显著降低，而数量会明显增加，这样的气泡群能够有效提高净化效率。When blowing air to purify molten steel, the length of air blowing time and the amount of air blowing per unit time will directly affect the purification effect. Prolonging the blowing time and increasing the blowing volume per unit time can certainly improve the purification effect, but this will increase the temperature drop of molten steel and the total amount of nitrogen blowing, resulting in waste of energy and resources, and may also affect the normal production. If the flow rate of the molten steel near the permeable brick is accelerated, the diameter of the bubbles will be significantly reduced under the action of the shearing of the molten steel, and the number will be significantly increased. Such a bubble group can effectively improve the purification efficiency.
随着吹气量的增加，钢水的流动会加快，这样会促进气泡上浮，减少了气泡在钢水中的停留时间，气泡在没有捕捉到较小尺寸的夹杂物的时候就会上浮到钢水液面，这会降低净化效率。气泡上浮的速度与钢水的流动状态息息相关。不同的钢水流动条件下，气泡上浮速度也不同，一般分为4种情况：Re＜2时，可以采用斯托克斯公式计算上浮速度；2＜Re＜400时，气泡群内产生环流，减少了运动阻力，气泡上浮速度比斯托克斯公式计算值要大500％；400＜Re＜5000时，气泡形状呈椭圆形，上浮时气泡摆动，呈螺旋形运动，比较分散；Re>5000时，气泡呈球帽形，上浮时对液体有强烈的搅拌作用，此时气泡上浮，速度与液体性质无关，与当量直径dg的平方根成正比。电磁制动可以无接触、无污染降低金属液流动速度，已经成熟应用于结晶器电磁制动方面。本发明则是利用电磁制动降低由于气泡上浮等引起的钢水流速变化，进而延长气泡在钢水中的停留时间，提高气泡捕捉较小尺寸夹杂物(<5μm)的效率。With the increase of air blowing volume, the flow of molten steel will be accelerated, which will promote the floating of bubbles and reduce the residence time of bubbles in molten steel. When the bubbles do not catch smaller-sized inclusions, they will float to the surface of molten steel. This reduces purification efficiency. The speed at which bubbles float up is closely related to the flow state of molten steel. Under different molten steel flow conditions, the floating speed of the bubbles is also different, generally divided into four situations: when Re<2, the floating speed can be calculated using the Stokes formula; when 2<Re<400, circulation occurs in the bubble group, reducing Taking into account the movement resistance, the floating speed of the bubbles is 500% greater than the value calculated by the Stokes formula; when 400<Re<5000, the shape of the bubbles is elliptical, and when they float up, the bubbles swing and move in a spiral shape, which is relatively dispersed; when Re>5000 , the bubbles are in the shape of a spherical cap, and when they float up, they have a strong stirring effect on the liquid. At this time, the bubbles float up, and the speed has nothing to do with the properties of the liquid, and is proportional to the square root of the equivalent diameter d g . Electromagnetic braking can reduce the flow speed of molten metal without contact and pollution, and has been maturely applied to the electromagnetic braking of molds. The present invention utilizes electromagnetic braking to reduce the flow rate change of molten steel caused by floating bubbles, etc., thereby prolonging the residence time of bubbles in molten steel and improving the efficiency of the bubbles in capturing small-sized inclusions (<5 μm).
本发明的有益效果为：The beneficial effects of the present invention are:
通过电磁搅拌无污染细化钢水中气泡，同时通过电磁制动减缓钢水气泡上浮速度，延长气泡在钢水中停留时间，可以提高气泡捕捉较小尺寸(＜5μm)夹杂物的效率，同时可以减少钢水温降和吹气总量，节约能源和资源。The bubbles in the molten steel are refined without pollution through electromagnetic stirring, and at the same time, the floating speed of the bubbles in the molten steel is slowed down by electromagnetic braking, and the residence time of the bubbles in the molten steel is prolonged. Water temperature drop and total air blowing save energy and resources.
附图说明Description of drawings
图1是去除夹杂物装置结构示意图；Fig. 1 is the structural schematic diagram of removing inclusion device;
图2是电磁搅拌器铁芯立体图；Fig. 2 is a three-dimensional view of the iron core of the electromagnetic stirrer;
图3是电磁制动磁场发生器结构示意图。Fig. 3 is a structural schematic diagram of the electromagnetic braking magnetic field generator.
图中：钢包1、电磁制动磁场发生器2、透气砖3、电磁搅拌器4、磁轭背5、磁轭6、吊环7、制动铁芯8、制动线圈9、箱体10。In the figure: steel ladle 1, electromagnetic brake magnetic field generator 2, air-permeable brick 3, electromagnetic stirrer 4, yoke back 5, yoke 6, suspension ring 7, brake iron core 8, brake coil 9, box 10.
具体实施方式detailed description
由图1可见，本发明细化气泡去除夹杂物装置主要是由钢包1、电磁制动磁场发生器2及电磁搅拌器4所组成。钢包1侧面设有电磁制动磁场发生器2，钢包1底部透气砖3的外围设置电磁搅拌器4。It can be seen from FIG. 1 that the air bubble removal device of the present invention is mainly composed of a ladle 1 , an electromagnetic braking magnetic field generator 2 and an electromagnetic stirrer 4 . An electromagnetic braking magnetic field generator 2 is provided on the side of the ladle 1, and an electromagnetic stirrer 4 is provided on the periphery of the air-permeable brick 3 at the bottom of the ladle 1.
电磁搅拌器4包括壳体、搅拌铁芯及搅拌线圈，搅拌铁芯外缠绕有搅拌线圈，搅拌铁芯由磁轭背5、磁轭6组成，磁轭6垂直于磁轭背5的上表面(见图2)。The electromagnetic stirrer 4 includes a shell, a stirring iron core and a stirring coil. The stirring coil is wound outside the stirring iron core. The stirring iron core is composed of a yoke back 5 and a yoke 6. The yoke 6 is perpendicular to the upper surface of the yoke back 5. (See Figure 2).
电磁制动磁场发生器2包括吊环7、制动铁芯8、制动线圈9、箱体10。(见图3)The electromagnetic braking magnetic field generator 2 includes a suspension ring 7 , a braking iron core 8 , a braking coil 9 and a box body 10 . (See Figure 3)
实施例1：Example 1:
对于小尺寸的盛放金属液的坩埚，如盛放500公斤钢水的坩埚，可以将电磁搅拌器4放置在坩埚底部靠近透气砖3附近，促进钢水流动，电磁搅拌磁感应强度在0.005～0.04T左右，钢水的流动速度约为0.2～1.5m/min。电磁制动磁场发生器2放置在坩埚中部。电磁制动磁场发生器2的箱体长950mm，宽550mm，高700mm。箱体8材质选用白钢，厚度在2mm。因为制动铁芯8和制动线圈9较重，约200kg,因而在箱体10内部需用槽钢做骨架，起支撑作用，并安装吊环7，以便于运输和安装。依靠该设备，可以产生最强约0.04T的磁场。利用电磁制动磁场发生器2可以将气泡在钢水中停留的时间延长10～30％左右。吹气净化过程中，在透气砖3附近施加搅拌磁场，同时在坩埚中上部施加制动磁场，能有效将去除<5μm夹杂物的效率提高40％以上，同时能够减少净化时间，减少金属液温降，节约能源和资源。For a small-sized crucible containing molten metal, such as a crucible containing 500 kg of molten steel, the electromagnetic stirrer 4 can be placed near the bottom of the crucible near the breathable brick 3 to promote the flow of molten steel. The magnetic induction intensity of electromagnetic stirring is about 0.005-0.04T , The flow velocity of molten steel is about 0.2 ~ 1.5m/min. The electromagnetic braking magnetic field generator 2 is placed in the middle of the crucible. The casing of the electromagnetic braking magnetic field generator 2 is 950mm long, 550mm wide, and 700mm high. The box body 8 is made of white steel with a thickness of 2 mm. Because the brake iron core 8 and the brake coil 9 are heavier, about 200kg, there is a need to use channel steel as the skeleton inside the casing 10 to play a supporting role, and the suspension ring 7 is installed to facilitate transportation and installation. Depending on this device, the strongest magnetic field of about 0.04T can be generated. Utilizing the electromagnetic braking magnetic field generator 2 can prolong the time for bubbles to stay in molten steel by about 10-30%. During the air blowing purification process, a stirring magnetic field is applied near the permeable brick 3, and a braking magnetic field is applied to the middle and upper part of the crucible, which can effectively increase the removal efficiency of <5 μm inclusions by more than 40%, and at the same time reduce the purification time and reduce the temperature of the molten metal. drop, saving energy and resources.
实施例2：Example 2:
利用100吨钢包1，采用底吹氩气净化钢液，电磁搅拌器4在钢包1底部透气砖3附近，搅动钢水，当透气砖3附近磁感应强度达到0.005T时钢水的流动速度可以达到0.5m/min以上。电磁制动磁场发生器2的尺寸在2m×1.5m×2m左右，可以将两套电磁制动磁场发生器2成对放置在钢包1两侧，这样可以增加电磁场的穿透深度，有利于钢包1中间钢水的电磁制动。在钢水中产生的磁场强度达到0.005～0.02T左右。利用该装置在相同的吹气时间内，可以将钢水中小尺寸夹杂物(<5μm)的去除效率提高30％以上，同时能够缩短精炼时间，降低钢液温降，节约能源和资源。一般来说软吹氩流量在60～200L/min，当吹氩5分钟以上时，钢水温降可能达到20℃。利用电磁搅拌器4细化氩气泡，同时利用电磁制动磁场发生器2延长气泡在钢液中的停留时间，可以缩短吹氩时间1～2分钟，这能够减少钢水温降4～8℃，对生产顺行和降本增效具有重要作用。Use 100 tons of ladle 1, use bottom blowing argon gas to purify molten steel, electromagnetic stirrer 4 is near the ventilating brick 3 at the bottom of ladle 1, stir molten steel, when the magnetic induction intensity near ventilating brick 3 reaches 0.005T, the flow speed of molten steel can reach 0.5m /min or more. The size of the electromagnetic braking magnetic field generator 2 is about 2m×1.5m×2m, and two sets of electromagnetic braking magnetic field generators 2 can be placed in pairs on both sides of the ladle 1, which can increase the penetration depth of the electromagnetic field and is beneficial to the ladle. 1 Electromagnetic braking of the middle molten steel. The magnetic field strength generated in molten steel reaches about 0.005-0.02T. Using the device within the same blowing time can increase the removal efficiency of small-sized inclusions (<5 μm) in molten steel by more than 30%, and can shorten the refining time, reduce the temperature drop of molten steel, and save energy and resources. Generally speaking, the flow rate of soft argon blowing is 60-200L/min. When blowing argon for more than 5 minutes, the temperature drop of molten steel may reach 20°C. Use the electromagnetic stirrer 4 to refine the argon bubbles, and at the same time use the electromagnetic brake magnetic field generator 2 to prolong the residence time of the bubbles in the molten steel, which can shorten the argon blowing time by 1 to 2 minutes, which can reduce the temperature drop of the molten steel by 4 to 8°C. It plays an important role in smooth production and cost reduction and efficiency increase.
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