CN114999304A - Simulation method for exploring slag flowing and mixing behaviors in thick slag layer iron bath furnace - Google Patents
Simulation method for exploring slag flowing and mixing behaviors in thick slag layer iron bath furnace Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 242
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 225
- 238000004088 simulation Methods 0.000 title claims abstract description 118
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 113
- 238000002156 mixing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000006399 behavior Effects 0.000 title abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 238000007664 blowing Methods 0.000 claims abstract description 96
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000007921 spray Substances 0.000 claims abstract description 67
- 239000002562 thickening agent Substances 0.000 claims abstract description 31
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 17
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 3
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- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000000661 sodium alginate Substances 0.000 claims description 3
- 235000010413 sodium alginate Nutrition 0.000 claims description 3
- 229940005550 sodium alginate Drugs 0.000 claims description 3
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- 238000003723 Smelting Methods 0.000 abstract description 9
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Abstract
The invention relates to a simulation method for exploring the flowing and mixing behaviors of molten slag in a thick slag layer iron bath furnace, which comprises the following steps: s1, preparing simulated slag; s2, measuring the kinematic viscosity of the slag simulation liquid; s3, pouring slag simulation liquid; s4, inserting and fixing a side-blowing spray gun; s5, opening a side-blowing spray gun; s6, adding a saturated NaCl or KCl solution; and S7, analyzing the mixing time. By adding a certain amount of thickening agent into a certain amount of water, the kinematic viscosity of the solution and the slag is similar, the conductivity of the solution is good, and a tracer agent can be added into the liquid to quantitatively describe the flowing and mixing behavior of the slag in a molten pool of a simulated iron bath reactor. The method solves the technical problem that the physical simulation experiment of the existing smelting reduction iron-making process is not suitable for a thick slag layer.
Description
Technical Field
The invention relates to the technical field of metallurgical reactors, in particular to a simulation method for exploring the flowing and mixing behaviors of molten slag in a thick slag layer iron bath furnace.
Background
The iron bath reactor is the main reaction vessel in the thick slag layer smelting reduction iron making process, and the part of the inner cavity of the reactor for containing slag is a reaction molten pool. Iron ore which is not pre-reduced or has a certain pre-reduction degree can complete the final reduction reaction in the thick slag layer of the reaction bath and carry out slag-iron separation. At the same time, pulverized coal and oxygen are injected into the thick slag layer through the lance to be combusted, and a large amount of heat and reducing gas are generated. For this reason, the temperature in the thick slag layer is generally relatively high and is accompanied by gas-liquid-solid multiphase chemical reactions. From the point of view of metallurgical macro-dynamics. Chemical reactions within the reactor are always accompanied by mass and heat transfer, which are closely related to fluid flow. That is, the flow and mixing of the fluid in the thick slag layer is directly related to the rate of the chemical reaction. However, for practical reactors, because the smelting environment is relatively complex, a plurality of phenomena and mechanisms inside the reactor cannot be directly observed and detected. For this reason, it is necessary to directly observe and detect many phenomena and mechanisms inside the reactor through physical simulation based on a similar principle as a theoretical basis.
In a physical simulation experiment of a smelting reduction iron-making process, transparent organic glass is generally adopted to simulate an iron bath reactor according to a certain similar proportion; simulating molten iron by using water; slag was simulated using some organic oil with a kinematic viscosity similar to that of slag. A stimulus-response experimental technique, i.e. adding tracer (usually electrolyte) to the water, is used to quantitatively simulate the flow and mixing behavior of molten iron in the actual reactor molten bath. For the existing and common ironmaking technology, a slag layer is thin and is not a main chemical reaction site, and secondly, more importantly, organic oil is almost non-conductive, so that the experiment cannot be carried out by adopting a stimulus-response experiment technology. For this reason, neglect of slag flow and mixing behavior during the experiment results. Therefore, the physical simulation experiment of the existing smelting reduction iron-making process is not suitable for the thick slag layer.
For the iron bath smelting reduction process with a thick slag layer, the thick slag layer is the main place of chemical reaction, and the research on the flowing and mixing behaviors of the thick slag layer is particularly important. In order to obtain the flowing and mixing behavior of the thick slag layer in the iron bath reactor, the thick slag layer is simulated by adopting water with conductive property, but the viscosity of the water is lower than that of the slag, and the method ignores the influence of the viscosity on the flowing of the fluid, so that the accuracy of experimental data is lower. Furthermore, for iron bath furnaces with thick slag layers, the axial insertion depth of the lance mouth of the side-blowing lance from the slag level has a non-negligible effect on the flow mixing behavior within the slag layer. In the existing physical model of the iron bath furnace, only a round hole is drilled on the side wall for inserting a side-blowing spray gun. The axial insertion depth of the muzzle of the side-blown lance from the slag surface cannot be changed without changing other operating parameters (angle, horizontal insertion depth), so that the accuracy of the experimental results is affected. Therefore, there is a need to develop an improved physical simulation method of the slag flow and mixing behavior in the iron bath with a thick slag layer, so as to obtain an accurate description of the slag flow and mixing behavior, and provide a reference for the relevant research of the iron bath.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a simulation method for exploring the slag flowing and mixing behavior in a thick slag layer iron bath, which solves the technical problems that the existing physical simulation experiment of the smelting reduction iron making process is not suitable for the thick slag layer and the axial insertion depth of the muzzle of the side-blowing lance from the slag surface cannot be changed without changing other operation parameters, so that the accuracy of the experiment result is affected.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, preparing simulated slag: preparing a solution with the kinematic viscosity range of 10-600 cSt by using a thickening agent and water, and taking the solution as a slag simulation solution;
s2, pouring slag simulation liquid: pouring the slag simulation liquid in the step S1 into a simulation iron bath reactor to form a simulation molten pool;
s3, inserting and fixing the side-blowing spray gun: inserting a side-blowing spray gun into the simulated molten pool in the step S2, wherein the side-blowing spray gun can adjust the position parameters of the muzzle of the side-blowing spray gun relative to the simulated molten pool according to the requirement, and the side-blowing spray gun is adjusted and fixed after the position is determined;
s4, opening an air supply valve of the side-blowing spray gun: opening an air supply valve of the side-blowing spray gun to blow air into the simulated iron bath reactor in the step S2 by the side-blowing spray gun, and measuring the value of the conductivity in the simulated iron bath reactor through the electrode probe in the air blowing process until the value of the conductivity changes within the range of +/-5%, namely the conductivity value is stable;
s5, adding NaCl or KCl solution: adding saturated NaCl or KCl solution according to 0.1-0.8% of the material volume in the simulated iron bath reactor;
s6, analyzing the mixing time: in the process of step S5, the change of the conductivity value in the simulated molten pool is continuously recorded, and after the change of the conductivity value is within the range of ± 5%, that is, the conductivity value is stabilized again, data is derived and the time for homogenizing the simulated molten pool is analyzed.
Optionally, in step S1, the temperature of the water is between 40 ° and 50 °; the addition amount of the thickening agent is 0.1-1.0% of the mass of water.
Alternatively,
step S1 includes the following steps:
s11, continuously stirring for 30-60 minutes while adding the thickening agent to dissolve most of the thickening agent in water, and standing for 4-10 hours;
s12, continuing to stir the solution after standing in the step S11 for 10-30 minutes, so that the residual thickener is completely dissolved in the water.
Optionally, the thickener is any one of chitosan, sodium alginate or hydroxyethyl cellulose.
Alternatively,
the step S1 further includes the steps of:
s13, measuring the dynamic viscosity of the solution obtained in the step S1 through the digital rotary viscometer; when the dynamic viscosity is more than 100mpa · s, selecting a rotor with the rotating speed of 30 r/min; when the dynamic viscosity is less than 100mpa · s, selecting a rotor with the rotating speed of 60 r/min;
and S14, calculating the kinematic viscosity of the slag simulation liquid according to the dynamic viscosity measured in the step S13.
Or,
the step S3 includes the steps of,
s31, arranging a plurality of vertical elongated slots on the outer wall of the simulated iron bath reactor, wherein the vertical elongated slots are used for inserting the side-blown spray guns;
s32, after the side-blowing spray gun is inserted into the vertical elongated slot, the position parameters of the side-blowing spray gun are adjusted and then the side-blowing spray gun is fixed through a fixing component.
Optionally, in step S3, the position parameters of the side-blowing lance relative to the simulated weld puddle include: axial depth, horizontal depth, tangential angle, and horizontal angle;
the axial depth is the depth from the outlet of the side-blown spray gun to the slag surface of the simulated molten pool;
the horizontal depth is the width of the outlet of the side-blowing spray gun from the outer wall of the simulated iron bath reactor in the radial direction;
the tangential angle is an included angle formed by the side-blown spray gun and the axial section of the simulated molten pool;
the horizontal angle is an included angle formed by the side-blown spray gun and the slag surface of the simulated molten pool.
Optionally, the number of the vertical elongated slots opened in the step S31 is 4-10, and the vertical elongated slots are uniformly distributed along the circumferential direction of the simulated iron bath reactor; the height of the vertical elongated slot is 1-2 times of the height of a molten pool where the slag simulation liquid is located; the width of the vertical elongated slot is 1-6 times the diameter of the side-blown lance.
Optionally, the included angle of the tangential angle ranges from 0 ° to 72 °.
Optionally, the side-blowing lance in the step S3 is a single-layer lance, and the adjustment range of the axial depth of the outlet of the side-blowing lance from the slag surface in the molten bath is 0.2 times to 1.0 times of the slag layer thickness, or;
the side-blown spray gun in the step S4 is a double-layer spray gun, and the axial depth adjusting range of the outlet of the upper side-blown spray gun relative to the simulated molten pool is 0.2-0.5 time of the thickness of the slag layer; the axial depth adjusting range of the outlet of the side-blown lance at the lower layer relative to the simulated molten pool is 0.6-1.0 time of the thickness of the slag layer.
(III) advantageous effects
The invention has the beneficial effects that: the invention provides a simulation method for exploring the flowing and mixing behaviors of slag in a thick slag layer iron bath reactor, which is characterized in that a thickening agent is added into quantitative water to ensure that the kinematic viscosity of a solution is similar to that of the slag, the conductivity of the solution is good, and a tracer (a common electrolyte) can be added into the liquid to quantitatively describe the flowing and mixing behaviors of the slag in a molten pool of the simulated iron bath reactor. The invention solves the technical problem that the physical simulation experiment of the existing smelting reduction iron-making process is not suitable for a thick slag layer. Moreover, the simulated iron bath reactor is provided with a vertical long and thin slot which is long, and other operating conditions such as: under the condition of angle and horizontal insertion depth, the axial height of the spray gun can be flexibly adjusted, and more accurate and reliable analysis data can be obtained by using a physical simulation experiment of the flowing and mixing behaviors of molten slag in a thick slag layer iron bath reactor.
Drawings
FIG. 1 is a schematic structural view of a physical simulation experimental apparatus used in the simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to the present invention;
FIG. 2 is a schematic diagram of the construction of the simulated iron bath reactor of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic view of the construction of the simulated iron bath reactor and side-blowing lance of FIG. 1 in accordance with the present invention;
FIG. 4 is a schematic top view of the structure of FIG. 3;
FIG. 5 is a graph showing a change in the conductivity curve in example 1 of the present invention;
FIG. 6 is a graph showing a change in the conductivity curve in example 2 of the present invention;
fig. 7 is a graph showing a change in the conductivity curve of comparative example 1 of the present invention.
[ description of reference ]
1: an airflow stabilizer; 2: simulating an iron bath reactor; 21: a vertical elongated slot; 3: slag simulation liquid; 4: a side-blown spray gun; 5: an electrode probe; 6: a conductivity meter; 7: a computer; 8: a gas flow meter; 9: and a pressure gauge.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings.
Referring to fig. 1-2, a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath according to an embodiment of the present invention includes the following steps:
in fact, before the physical simulation experiment of the invention is carried out, a pre-experiment needs to be carried out, and it should be noted that in the pre-experiment process, the slag simulation liquid with different kinematic viscosities is obtained correspondingly by continuously increasing the proportion between the thickening agent and the water. And then, in the following physical experiment, firstly, determining the kinematic viscosity of the actual slag to be examined, and finally, determining the amount of the thickening agent to be added in the experiment according to the requirement of the kinematic viscosity and the result of the preliminary experiment.
S1, preparing simulated slag: a fixed amount of water is taken. Further, in step S1, the temperature of the water is between 40-50. Specifically, the water with the temperature of 40-50 ℃ is obtained by directly heating the water to 50 ℃ or mixing the water with the boiled water with the temperature of 100 ℃. Then adding thickening agent with the addition amount of 0.1-1.0% of the water mass into the warm water, so that the thickening agent is completely dissolved in the water to prepare a solution with the kinematic viscosity range of 10-600 cSt, and the solution is used as slag simulation liquid 3.
Further, step S1 includes the steps of:
s11, adding the thickening agent, continuously stirring for 30-60 minutes to dissolve most of the thickening agent in water, and standing for 4-10 hours.
And S12, continuing stirring the solution after standing in the step S11 for 10-30 minutes to ensure that the residual thickening agent is completely dissolved in the water. The thickening agent is completely dissolved in water, so that the prepared solution has better conductivity and certain viscosity, and the kinematic viscosity of the solution is closer to that of a thick slag layer, and the solution is used as good simulated slag in a physical simulation experiment.
Further, the thickener is any one of chitosan, sodium alginate or hydroxyethyl cellulose. Wherein, the chitosan has better intermiscibility with water, and is convenient to form good simulated slag.
Further, the step S1 further includes the following step, which is performed after S12, in order to ensure the kinematic viscosity accuracy of the slag simulation liquid 3 in the experiment again:
s13, measuring the dynamic viscosity of the solution obtained in the step S1 by a digital rotary viscometer. When the dynamic viscosity is more than 100mpa · s, a rotor with the rotating speed of 30r/min is selected. When the dynamic viscosity is less than 100mpa · s, a rotor with the rotation speed of 60r/min is selected.
It should be noted that, the dynamic viscosity of the solution is measured by a digital rotational viscometer, and when the dynamic viscosity is measured, the rotors with different rotation speeds are correspondingly adopted according to the dynamic viscosity of the solution, so that the measured dynamic viscosity error is minimum, and accordingly, the dynamic viscosity value measured at the rotation speed is most stable. And then make the kinematic viscosity value that the experiment calculated more accurate, and then improved the precision of experiment, reduced the error.
And S14, calculating the kinematic viscosity of the slag simulation liquid 3 according to the dynamic viscosity measured in the step S21.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated molten bath. That is, the part of the simulated iron bath reactor 2 containing the slag simulant liquid 3 forms a simulated molten bath naturally, and the slag layer of the simulated molten bath is thicker and thus is a simulated thick slag layer.
S3, inserting and fixing the side-blow lance 4: inserting the side-blowing lance 4 into the simulated molten pool in the step S2, adjusting the position parameters of the muzzle of the side-blowing lance 4 relative to the simulated molten pool according to the requirements, adjusting the position of the side-blowing lance 4, and fixing the side-blowing lance 4.
Further, referring to fig. 3, in step S3, the position parameters of the side-blowing lance 4 with respect to the simulated molten bath include: axial depth, horizontal depth, tangential angle, and horizontal angle.
Referring to fig. 3, the axial depth is the depth h of the outlet of the side-blowing lance 4 from the slag surface of the simulated molten bath.
The horizontal depth is the width l of the outlet of the side-blowing lance 4 from the outer wall of the simulated iron bath reactor 2.
Referring to fig. 4, the tangential angle is the angle β formed by the side-blowing lance 4 and the central axis of the axial cross-section of the simulated molten bath. In addition, in fig. 4, when the side-blow lances 4 are broken lines and solid lines, that is, when the tangential angle β of the side-blow lance 4 is constant, the side-blow lance 4 can be deviated in two directions.
The horizontal angle is an included angle alpha formed by the side-blowing lance 4 and the slag surface of the molten pool.
It should be noted that the side-blowing lance 4 of the present invention not only has an adjustable axial depth h of axial insertion, but also has a horizontal depth l of horizontal insertion and an included angle β with an axial cross-section of the simulated molten pool, and the axial cross-section may be a cross-section of the central axis B-B in fig. 4, which is vertically downward. Namely, the tangential angle and the included angle alpha formed by the slag surface of the molten pool, namely the horizontal angle are both adjustable, namely, the 4 position parameters can be independently changed. So that the experimental data are more accurate.
It is then particularly emphasized that the invention makes it possible, for the 4 positional parameters mentioned above, to set the tangential angle to 0 °, and for the other 3 parameters horizontal depth, axial depth and horizontal angle to be adjusted without changing the other 2 parameters. That is, the invention adopts the vertical elongated slot 21, if only the axial depth h of the side-blowing lance 4 is changed, the other three parameters are not changed, which can be realized for the invention, but the existing simulation experiment is a round hole, once the axial depth of the lance is changed, the existing horizontal angle alpha or the existing horizontal depth l must be changed at the same time, so that the existing method cannot change only one parameter, and the position parameter is very important for laboratory research. Comparative experimental studies of single parameter changes could not be performed. Thereby affecting the experimental results. Compared with the existing round hole drilling method, the invention can also change the inserted tangential angle of the side-blown spray gun 4, so that the experimental parameters are more comprehensive, and more accurate experimental data can be obtained.
In the prior art, a series of circular holes are formed in the side wall of the simulated iron bath reactor 2 and used for inserting the side-blowing spray gun 4. However, the insertion position of the side-blowing lance 4 in the prior art cannot be changed, and many parameters cannot be studied in a simulation experiment. In this embodiment, unlike the prior art, a long groove is formed in the height direction of the simulated iron bath reactor 2 so that the lance can be moved to different positions in the height direction.
And S31, a plurality of vertical elongated slots 21 are formed in the outer wall of the simulated iron bath reactor 2, and the vertical elongated slots 21 are used for inserting the side-blowing lance 4.
And S32, after the side-blowing spray gun 4 is inserted into the vertical elongated slot 21, the angle and the position are adjusted and then the side-blowing spray gun is fixed through a fixing component.
Specifically, the specific position of the side-blowing spray gun 4 is determined, then the vertical elongated slot 21 is plugged by a soft plastic sheet, then the plastic sheet is punched, the side-blowing spray gun 4 is inserted, the angle and the position of the side-blowing spray gun 4 are determined, and then the gap between the side-blowing spray gun 4 and the plastic sheet hole is plugged by plasticine or glue. The angle at which the side-blowing lance 4 is inserted into the simulated iron bath reactor 2 is the angle alpha formed by the side-blowing lance 4 and the slag surface of the simulated molten bath and the angle beta formed by the side-blowing lance 4 and the axial cross-section, and these angles can naturally be adjusted. The side-blowing lance 4 is inserted in a position simulating the iron bath reactor 2, where the position refers to the horizontal depth l of horizontal insertion of the lance mouth of the side-blowing lance 4 in the radial direction and the axial depth h of vertical insertion of the lance mouth in the axial direction. When the insertion height of the side-blowing lance 4 on the wall surface is adjusted, the soft plastic sheet is replaced and the hole is punched again.
It should be noted that, the side-blowing spray gun 4 is connected to the air current flow stabilizer 1, the air current stabilizer 1 can introduce air into the side-blowing spray gun 4, and the air current stabilizer 1 includes a gas flowmeter 11 for measuring the amount of the introduced air and a pressure gauge 12 for detecting the pressure in the air current stabilizer 1.
Furthermore, the height of the vertical elongated slot 21 is 1-2 times of the height of the simulated molten pool in which the slag simulation liquid 3 is located, so that the insertion position of the side-blowing lance 4 on the wall surface can be flexibly adjusted, and the influence of different positions of the muzzle of the side-blowing lance 4 in the slag layer on the slag flowing and mixing behaviors can be researched.
The width of the vertical elongated slot 21 is 1-6 times the diameter of the side-blown lance 4, which facilitates the flexible adjustment of the position parameters of the side-blown lance 4 and the simulated iron bath reactor 2.
Further, the included angle of the tangential angle ranges from 0 to 72.
Further, the side-blown lance 4 in the step S3 is a single-layer lance, and the adjustment range of the axial depth of the outlet of the side-blown lance 4 from the slag surface in the thick slag layer is 0.2 to 1.0 times the thickness of the slag layer, so as to study the influence rule of the single-layer lance on the slag flowing and mixing behavior in the slag layer, or;
the side-blown spray gun 4 in the step S3 is a double-layer spray gun, and the adjustment range of the axial height of the outlet of the side-blown spray gun 4 on the upper layer from the slag surface in the thick slag layer is 0.2-0.5 time of the thickness of the slag layer. The adjusting range of the axial height of the outlet of the spray gun of the lower layer side-blown spray gun 4 from the slag surface in the slag layer is 0.6-1.0 time of the thickness of the slag layer, the aim is to separate the working areas of the upper layer spray gun and the lower layer spray gun, and the influence rule of the arrangement of the upper layer spray gun and the lower layer spray gun in the respective working areas on the flow and mixing behavior of the molten slag is researched.
It should be noted that whether the side-blowing lance 4 is a single-layer side-blowing lance or the side-blowing lance 4 is a double-layer side-blowing lance is determined depending on the iron bath reactor. And blowing parameters of different layers are different.
S4, opening the side-blowing lance 4: the air supply valve of the side-blowing lance 4 was opened to blow air into the simulated iron bath reactor 2 in step S2 from the side-blowing lance 4, and the electric conductivity in the simulated iron bath reactor 2 was measured by the electrode probe 5 during the blowing until the electric conductivity value stabilized.
S5, introducing NaCl or KCl solution: according to the volume of the material in the simulated iron bath reactor 2 of 0.1-0.8 percent, saturated NaCl or KCl solution is quickly added by a pulse injection method.
S6, analyzing the mixing time: in the process of step S5, the change in the value of the electrical conductivity in the simulated iron bath reactor 2 is continuously recorded, the electrode probe 5 is taken out after the electrical conductivity has stabilized again, the data is derived, and the time for homogeneous mixing of the simulated thick slag layer is analyzed.
It should be noted that, the judgment of the liquid stability cannot be carried out by naked eyes, and the measurement is carried out by the conductivity meter 6, one end of the conductivity meter 6 is connected with the computer 7 by a data line, the other end of the conductivity meter 6 is connected with the electrode probe 5, and the electrode probe 5 extends into the simulated thick slag layer, so that the conductivity in the simulated iron bath reactor 2 can be accurately measured, as shown in fig. 1. The slag melt is stable only when the conductivity change on the computer 7 is within ± 5% by data on the computer 7.
The invention provides a simulation method for exploring the slag flowing and mixing behaviors in a thick slag layer iron bath furnace, which is characterized in that a certain amount of thickening agent is added into a certain amount of water, so that the kinematic viscosity of a solution is similar to that of slag, the conductivity of the solution is good, and a tracer (common electrolyte) can be added into the liquid to quantitatively describe the slag flowing and mixing behaviors in a molten pool of a simulated iron bath reactor 2. The technical problem that a physical simulation experiment of the existing smelting reduction iron-making process is not suitable for a thick slag layer is solved. Moreover, the simulated iron bath reactor 2 is provided with a vertical elongated slot 21, the vertical elongated slot 21 is in a strip shape, and other operating conditions such as: under the condition of angle and horizontal insertion depth, the axial height of the spray gun can be flexibly adjusted, and more accurate and reliable analysis data can be obtained by using the spray gun in a physical simulation experiment of slag flowing and mixing behaviors in a thick slag layer iron bath furnace.
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, taking a specified amount of water according to the experimental requirements, mixing with a certain amount of boiled water to obtain 34L of warm water with the temperature of 40-50 ℃, and then adding chitosan powder into the warm water, wherein the adding amount is 0.24 percent of the mass of the water. Continuously stirring for 30-60 min, dissolving most of chitosan in water, standing for 4-10 hr, and stirring for 10-30 min to dissolve the rest of thickener in water.
The kinematic viscosity of the slag simulant 3 was measured to be 42.9cSt using a digital rotational viscometer.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated molten bath with the experimentally specified height. It should be noted that, in practical application, the simulated iron bath reactor 2 is manufactured first, then the step S4 is completed, and then the molten slag simulation liquid 3 is poured, so that the amount of the molten slag simulation liquid 3 in the simulated iron bath reactor 2 is conveniently controlled, and the accuracy of the simulation experiment is further improved.
S3, setting the horizontal angle of the upper layer lance to be 45 degrees and the tangential angle to be 0 degree, setting the horizontal insertion depth of the lance outlet from the wall surface to be 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the lance outlet from the slag layer surface to be 0.3 times of the thickness (0.072m) of the slag layer of the slag simulation liquid 3. The horizontal angle of the lower layer lance is 50 degrees, the tangential angle is 0 degree, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulation liquid 3. And pouring the prepared liquid into a physical model of the iron bath furnace to enable the liquid level to reach the designated height.
S4, opening the air valve of the side-blowing lance 4, and adjusting the air flow of the upper side-blowing lance 4 to 3.99Nm 3 H, the gas flow of the lower side-blown lance 4 was adjusted to 6.37Nm 3 And/h, blowing for about ten minutes to stabilize the slag simulation liquid 3 in the equipment, and fixing the electrode probe 5 at a proper position. The electrode probe 5 is connected with a computer 7 through a conductivity meter 6, and after the reading of the conductivity meter 6 is stable, the conductivity changes within the range of +/-5%.
S5, 100ml of saturated NaCl solution is added.
S6, continuously recording the change of the value, taking out the electrode probe 5 after the reading is stabilized again, deriving data, and analyzing the mixing time of the slag simulation liquid 3, wherein the mixing time determination method is to determine that the slag simulation liquid 3 in the simulated molten pool is mixed uniformly when the conductivity reaches within ± 5% of the stable value, and the result is shown in fig. 5: the slag simulation liquid 3 in the simulated molten pool is mixed evenly in the 8 th time.
Example 2:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, taking a specified amount of water according to the experimental requirement, mixing with a certain amount of boiled water to obtain 34L of warm water with the temperature of 40-50 ℃, and then adding chitosan powder into the warm water, wherein the adding amount is 0.3 percent of the mass of the water. Continuously stirring for 30-60 min to dissolve most of chitosan in water, standing for 4-10 hr, and stirring for 10-30 min to dissolve the rest of thickener in water.
The kinematic viscosity of the slag simulation liquid 3 was measured to be 57.3cSt using a digital rotational viscometer.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated thick slag layer. The prepared liquid is poured into the simulated iron bath reactor 2, so that the liquid level reaches the designated height. It should be noted that, in practical application, the step S4 is completed before the slag simulation liquid 3 is poured, so that the amounts of the slag simulation liquid 3 and the simulated iron bath reactor 2 are conveniently controlled, and the accuracy of the simulation experiment is further improved.
S3, setting the horizontal angle of the inserted upper layer lance at 45 degrees and the tangential angle at 0 degrees, setting the horizontal insertion depth of the lance outlet from the wall surface to be 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the lance outlet from the surface of the slag layer to be 0.3 times of the thickness (0.072m) of the slag layer of the slag simulated liquid 3. The horizontal angle of the lower layer lance is 50 degrees, the tangential angle is 0 degree, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulation liquid 3. And pouring the prepared liquid into the physical model of the iron bath furnace to enable the liquid level to reach the designated height.
S4, opening the air supply valve of the side-blowing lance 4 to adjust the air quantity of the upper side-blowing lance 4 to 3.99Nm 3 H, the air flow of the lower layer side-blowing lance 4 is adjusted to 6.37Nm 3 And/h, blowing for about ten minutes to stabilize the slag simulation liquid 3 in the equipment, and fixing the electrode probe 5 at a proper position. The electrode probe 5 is connected with a computer 7 through a conductivity meter 6, and after the reading of the conductivity meter 6 is stable, the conductivity changes within the range of +/-5%.
S5, adding 100ml of saturated NaCl solution.
S6, continuously recording the numerical value change, taking out the electrode probe 5 after the read number is stabilized again, deriving data and analyzing the mixing time of the slag simulation liquid 3 in the simulated molten pool, wherein the mixing time is determined by considering that the slag simulation liquid 3 in the simulated molten pool is mixed uniformly when the conductivity reaches the range of +/-5% of the stable value, and the result is shown in figure 6: the slag simulation liquid 3 in the simulated molten pool is mixed evenly at the 13 th s.
Example 3:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, taking a specified amount of water according to the experimental requirements, mixing with a certain amount of boiled water to obtain 34L of warm water with the temperature of 40-50 ℃, and then adding chitosan powder into the warm water, wherein the adding amount is 0.5 percent of the mass of the water. Continuously stirring for 30-60 min to dissolve most of chitosan in water, standing for 4-10 hr, and stirring for 10-30 min to dissolve the rest of thickener in water.
The kinematic viscosity of the slag simulation liquid 3 is measured to be 129cSt by a digital rotational viscometer.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated thick slag layer. The prepared liquid is poured into the simulated iron bath reactor 2, so that the liquid level reaches the designated height. It should be noted that, in practical application, the step S4 is completed before the slag simulation liquid 3 is poured, so that the amounts of the slag simulation liquid 3 and the simulated iron bath reactor 2 are conveniently controlled, and the accuracy of the simulation experiment is further improved.
S3, setting the horizontal angle of the inserted upper layer lance at 45 degrees and the tangential angle at 0 degrees, setting the horizontal insertion depth of the lance outlet from the wall surface to be 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the lance outlet from the surface of the slag layer to be 0.3 times of the thickness (0.072m) of the slag layer of the slag simulated liquid 3. The horizontal angle of the lower layer lance is 50 degrees, the tangential angle is 0 degree, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulation liquid 3. And pouring the prepared liquid into the physical model of the iron bath furnace to enable the liquid level to reach the designated height.
S4, opening the air supply valve of the side-blowing lance 4 to adjust the air quantity of the upper side-blowing lance 4 to 3.99Nm 3 H, the air flow of the lower layer side-blowing lance 4 is adjusted to 6.37Nm 3 And/h, blowing for about ten minutes to stabilize the slag simulation liquid 3 in the equipment, and fixing the electrode probe 5 at a proper position. The electrode probe 5 is connected with a computer 7 through a conductivity meter 6 to be conductedAfter the readings of the rate meter 6 are stabilized, the conductivity changes within a range of + -5%.
S5, adding 100ml of saturated NaCl solution.
S6, continuously recording the numerical value change, taking out the electrode probe 5 after the read number is stabilized again, deriving data and analyzing the mixing time of the slag simulation liquid 3 in the simulated molten pool, wherein the mixing time determination method is that when the conductivity reaches the range of +/-5% of the stable value, the slag simulation liquid 3 in the simulated molten pool can be considered to be mixed uniformly, and the result is that: the solution in the simulated bath was mixed evenly at 35 s.
Example 4:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, taking a specified amount of water according to the experimental requirement, mixing with a certain amount of boiled water to obtain 34L of warm water with the temperature of 40-50 ℃, and then adding chitosan powder into the warm water, wherein the adding amount is 0.7 percent of the mass of the water. Continuously stirring for 30-60 min to dissolve most of chitosan in water, standing for 4-10 hr, and stirring for 10-30 min to dissolve the rest of thickener in water.
The kinematic viscosity of the slag simulation liquid 3 is measured to be 342cSt by a digital rotational viscometer.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated thick slag layer. The prepared liquid is poured into the simulated iron bath reactor 2, so that the liquid level reaches the designated height. It should be noted that, in practical application, the step S4 is completed before the slag simulation liquid 3 is poured, so that the amounts of the slag simulation liquid 3 and the simulated iron bath reactor 2 are conveniently controlled, and the accuracy of the simulation experiment is further improved.
S3, setting the horizontal angle of the upper layer lance to be 45 degrees and the tangential angle to be 0 degree, setting the horizontal insertion depth of the lance outlet from the wall surface to be 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the lance outlet from the slag layer surface to be 0.3 times of the thickness (0.072m) of the slag layer of the slag simulation liquid 3. The horizontal angle of the lower layer lance is 50 degrees, the tangential angle is 0 degree, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulated liquid 3. And pouring the prepared liquid into a physical model of the iron bath furnace to enable the liquid level to reach the designated height.
S4, opening an air supply valve of the side-blowing spray gun 4, adjusting the air flow of the upper layer side-blowing spray gun 4 to 3.99Nm3/h, adjusting the air flow of the lower layer side-blowing spray gun 4 to 6.37Nm3/h, blowing air for about ten minutes to stabilize the slag simulation liquid 3 in the device, and fixing the electrode probe 5 at a proper position. The electrode probe 5 is connected with a computer 7 through a conductivity meter 6, and after the reading of the conductivity meter 6 is stable, the conductivity changes within the range of +/-5%.
S5, adding 100ml of saturated NaCl solution.
S6, continuously recording the numerical value change, taking out the electrode probe 5 after the read number is stabilized again, deriving data and analyzing the mixing time of the slag simulation liquid 3 in the simulated molten pool, wherein the mixing time determination method is that when the conductivity reaches the range of +/-5% of the stable value, the slag simulation liquid 3 in the simulated molten pool can be considered to be mixed uniformly, and the result is that: the slag simulation liquid 3 in the simulated molten pool is mixed evenly at the 113 th s.
Example 5:
a simulation method for exploring the flow and mixing behavior of molten slag in a thick slag layer iron bath furnace comprises the following steps:
s1, taking a specified amount of water according to the experimental requirement, mixing with a certain amount of boiled water to obtain 34L of warm water with the temperature of 40-50 ℃, and then adding chitosan powder into the warm water, wherein the adding amount is 1.0 percent of the mass of the water. Continuously stirring for 30-60 min to dissolve most of chitosan in water, standing for 4-10 hr, and stirring for 10-30 min to dissolve the rest of thickener in water.
The kinematic viscosity of the slag simulant 3 was measured to be 564cSt using a digital rotational viscometer.
S2, pouring slag simulation liquid 3: the slag simulation liquid 3 in the step S1 is poured into the simulated iron bath reactor 2 to form a simulated thick slag layer. The prepared liquid is poured into the simulated iron bath reactor 2, so that the liquid level reaches the designated height. It should be noted that, in practical application, the step S4 is completed before the slag simulation liquid 3 is poured, so that the amounts of the slag simulation liquid 3 and the simulated iron bath reactor 2 are conveniently controlled, and the accuracy of the simulation experiment is further improved.
S3, setting the horizontal angle of the inserted upper layer lance at 45 degrees and the tangential angle at 0 degrees, setting the horizontal insertion depth of the lance outlet from the wall surface to be 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the lance outlet from the surface of the slag layer to be 0.3 times of the thickness (0.072m) of the slag layer of the slag simulated liquid 3. The horizontal angle of the lower layer lance is 50 degrees, the tangential angle is 0 degree, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulation liquid 3. And pouring the prepared liquid into the physical model of the iron bath furnace to enable the liquid level to reach the designated height.
S4, opening the gas valve of the side-blowing lance 4, and adjusting the gas amount of the upper side-blowing lance 4 to 3.99Nm 3 H, the gas flow of the lower side-blown lance 4 was adjusted to 6.37Nm 3 And/h, blowing for about ten minutes to stabilize the slag simulation liquid 3 in the equipment, and fixing the electrode probe 5 at a proper position. The electrode probe 5 is connected with a computer 7 through a conductivity meter 6, and after the reading of the conductivity meter 6 is stable, the conductivity changes within the range of +/-5%.
S5, 100ml of saturated NaCl solution is added.
S6, continuously recording the numerical value change, taking out the electrode probe 5 after the read number is stabilized again, deriving data and analyzing the uniform mixing time of the slag simulation liquid 3 in the simulated molten pool, wherein the uniform mixing time determination method is that when the electric conductivity reaches the range of +/-5% of the stable value, the solution in the slag simulation liquid 3 in the simulated molten pool is considered to be uniformly mixed, and the result is that: the slag simulation liquid 3 in the simulated molten pool is mixed evenly at 190 s.
Comparative example 1:
step one, taking 34L of normal-temperature water.
And step two, setting the horizontal angle of the upper layer spray gun to be 45 degrees, wherein the horizontal insertion depth of the spray gun outlet from the wall surface is 0.6r (0.135m), and the axial insertion depth of the spray gun outlet from the slag layer surface is 0.3h (0.072 m). The horizontal angle of the lower layer lance insertion is 50 degrees, the horizontal insertion depth of the lance outlet from the wall surface is 0.6 times of the radius (0.135m) of the simulated iron bath reactor 2, and the axial insertion depth of the lance outlet from the slag surface is 0.8 times of the thickness (0.16m) of the slag layer of the slag simulation liquid 3. Pouring the prepared liquid into a physical model of the iron bath furnace, enabling the liquid level to reach the designated height, setting the horizontal angle of the insertion of the upper layer spray gun at 45 degrees, setting the horizontal insertion depth of the spray gun outlet from the wall surface to be 0.6 time of the radius (0.135m) of the simulated iron bath reactor 2, and setting the axial insertion depth of the spray gun outlet from the surface of the slag layer to be 0.3 time of the thickness (0.072m) of the slag layer of the slag simulation liquid 3. The horizontal angle of the lower layer of the lance is 50 degrees, the horizontal insertion depth of the outlet of the lance from the wall surface is 0.6r (0.135m), and the axial insertion depth of the outlet of the lance from the slag surface is 0.8h (0.16 m). And pouring the prepared liquid into the physical model of the iron bath furnace to enable the liquid level to reach the designated height.
Step three, opening a gas valve, and adjusting the gas quantity of the upper layer spray gun to 3.99Nm 3 The gas flow of the lower layer spray gun is adjusted to 6.37Nm 3 The solution in the apparatus was stabilized by blowing air for about ten minutes, and the electrode probe 5 was fixed in place.
And step four, connecting the conductivity meter 6 with a computer 7, adding 100ml of saturated NaCl solution after the reading of the conductivity meter 6 is stable, continuously recording the numerical value change of the saturated NaCl solution, taking out the electrode probe 5 after the reading is stable again, deriving data and analyzing the mixing time of the molten pool, wherein the mixing time is determined by considering that the solution in the molten pool is mixed uniformly when the conductivity reaches the range of +/-5% of the stable value. The results are shown in FIG. 7: the solution in the simulated iron bath reactor 2 reached homogeneous mixing at 6 s.
As is clear from the above examples 1 to 5 and comparative example 1, the viscosity of the slag simulant 3 greatly affects the solution mixing time of the slag simulant 3.
It was found experimentally that the homogenisation time increases with increasing viscosity of the solution. If no thickener is added and only water is used, the mixing time is only 6s under the same experimental conditions, and the mixing time is obviously prolonged after the thickener is added. Therefore, the effect of slag viscosity on the homogenization time is not negligible, and water alone cannot be used to simulate slag.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A simulation method for exploring the flowing and mixing behavior of molten slag in a thick slag layer iron bath furnace is characterized by comprising the following steps of: the method comprises the following steps:
s1, preparing simulated slag: preparing a solution with the kinematic viscosity range of 10cSt-600cSt by using a thickening agent and water as a slag simulation solution (3);
s2, pouring slag simulation liquid (3): pouring the slag simulation liquid (3) in the step S1 into a simulation iron bath reactor (2) to form a simulation molten pool;
s3, inserting and fixing the side-blowing spray gun (4): inserting a side-blowing lance (4) into the simulated molten pool in the step S2, wherein the side-blowing lance (4) can adjust the position parameters of the muzzle of the side-blowing lance relative to the simulated molten pool according to the requirement, and the side-blowing lance (4) is adjusted, determined and fixed;
s4, opening an air supply valve of the side-blowing spray gun (4): opening an air supply valve of the side-blowing lance (4) to blow air into the simulated iron bath reactor (2) in the step S2 by the side-blowing lance (4), and measuring the value of the conductivity in the simulated iron bath reactor (2) through an electrode probe (5) during the air blowing process until the value of the conductivity changes within the range of +/-5 percent, namely the value of the conductivity is stable;
s5, adding NaCl or KCl solution: adding saturated NaCl or KCl solution according to 0.1-0.8% of the volume of the material in the simulated iron bath reactor (2);
s6, analyzing the mixing time: in the process of step S5, the change of the conductivity value in the simulated molten pool is continuously recorded, and after the change of the conductivity value is within the range of ± 5%, that is, the conductivity value is stabilized again, data is derived and the time for homogenizing the simulated molten pool is analyzed.
2. The simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to claim 1, wherein: in step S1, the temperature of the water is between 40 ° and 50 °; the addition amount of the thickening agent is 0.1-1.0% of the mass of water.
3. A simulation method for exploring the flow and mixing behavior of slag in a thick slag layer iron bath according to claim 1, characterized by: step S1 includes the following steps:
s11, continuously stirring for 30-60 minutes while adding the thickening agent to dissolve most of the thickening agent in water, and standing for 4-10 hours;
and S12, continuing stirring the solution after standing in the step S11 for 10-30 minutes, so that the rest of the thickening agent is completely dissolved in the water.
4. A simulation method for exploring the flow and mixing behavior of slag in a thick slag layer iron bath according to claim 1, characterized by: the thickening agent is any one of chitosan, sodium alginate or hydroxyethyl cellulose.
5. A simulation method for exploring the flow and mixing behavior of slag in a thick slag layer iron bath according to claim 3, characterized in that: the step S1 further includes the steps of:
s13, measuring the dynamic viscosity of the solution obtained in the step S1 through the digital rotary viscometer; when the dynamic viscosity is more than 100mpa · s, selecting a rotor with the rotating speed of 30 r/min; when the dynamic viscosity is less than 100mpa · s, selecting a rotor with the rotating speed of 60 r/min;
and S14, calculating the kinematic viscosity of the slag simulation liquid (3) according to the dynamic viscosity measured in the step S13.
6. A simulation method for exploring the flow and mixing behavior of slag in a thick slag layer iron bath according to claim 1, characterized by: the step S3 includes the steps of,
s31, a plurality of vertical elongated slots (21) are formed in the outer wall of the simulated iron bath reactor (2), and the vertical elongated slots (21) are used for being inserted into the side-blowing spray guns (4);
s32, after the side-blowing spray gun (4) is inserted into the vertical elongated slot (21), the position parameters of the side-blowing spray gun (4) are adjusted and then fixed through a fixing component.
7. The simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to claim 1, wherein: in step S3, the position parameters of the side-blowing lance (4) relative to the simulated weld puddle include: axial depth, horizontal depth, tangential angle, and horizontal angle;
the axial depth is the depth from the outlet of the side-blowing lance (4) to the slag surface of the simulated molten pool;
the horizontal depth is the width of the outlet of the side-blowing spray gun (4) from the outer wall of the simulated iron bath reactor (2) in the radial direction;
the tangential angle is an included angle formed by the side-blown spray gun (4) and the axial section of the simulated molten pool;
the horizontal angle is an included angle formed by the side-blown spray gun (4) and the slag surface of the simulated molten pool.
8. The simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to claim 6, wherein: the number of the vertical elongated slots (21) opened in the step S31 is 4-10, and the vertical elongated slots (21) are uniformly distributed along the circumferential direction of the simulated iron bath reactor (2); the height of the vertical elongated slot (21) is 1-2 times of the simulated molten pool height; the width of the vertical elongated slot (21) is 1-6 times of the diameter of the side-blowing lance (4).
9. The simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to claim 8, wherein: the included angle of the tangential angle ranges from 0 degrees to 72 degrees.
10. The simulation method for exploring the slag flow and mixing behavior in a thick slag layer iron bath according to claim 1, wherein: the side-blown lance (4) in the step S3 is a single-layer lance, and the adjusting range of the axial depth of the outlet of the side-blown lance (4) from the slag surface in the molten pool is 0.2-1.0 time of the thickness of the slag layer, or;
the side-blown spray gun (4) in the step S4 is a double-layer spray gun, and the axial depth adjusting range of the outlet of the upper layer side-blown spray gun (4) relative to the simulated molten pool is 0.2-0.5 time of the thickness of the slag layer; the axial depth adjusting range of the outlet of the side-blown lance (4) at the lower layer relative to the simulated molten pool is 0.6-1.0 time of the thickness of the slag layer.
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Application publication date: 20220902 |