CN111979375B - Molten iron KR stirring mixing characteristic quantitative characterization method and intelligent desulfurization method - Google Patents
Molten iron KR stirring mixing characteristic quantitative characterization method and intelligent desulfurization method Download PDFInfo
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Abstract
The invention discloses a quantitative characterization method for KR stirring mixing characteristics of molten iron and an intelligent desulfurization method, which realize the accurate measurement of the height of a molten iron slag surface and the height of a molten iron liquid level and the accurate calculation of a slag skimming amount through the installation and distance measurement of a molten iron slag skimming position laser level meter, thereby ensuring the accurate control of the insertion depth of a stirrer, simultaneously making up the deficiency of the slag skimming amount in the prior art and providing reliable original data for reducing the iron loss measurement caused by molten iron desulfurization and slag skimming. The method has the advantages that the installation of the high-definition video camera of the molten iron desulphurization position and the application of the image recognition software ensure the rapid recognition and acquisition of the video image quality and the characterization accurate parameters, and the aim of accurate, rapid and intelligent control of the stirring rotating speed is fulfilled according to the regulation rate of 5-10 r/min based on the difference of the established control range requirements of the characterization parameters of the desulfurizer adding stage and the stirring desulphurization stage.
Description
Technical Field
The invention relates to the technical field of molten iron pretreatment, in particular to a quantitative characterization method for KR stirring mixing characteristics of molten iron and an intelligent desulfurization method.
Background
The mechanical stirring desulfurization process of the molten iron KR comprises the following steps: a single-layer blade stirrer with an outer lining made of refractory material is vertically immersed in molten iron along the center of a molten iron tank to be rotationally stirred, the molten iron liquid surface generates a vortex, weighed desulfurizing agents are added to the molten iron surface through a feeder, the desulfurizing agents floating on the molten iron liquid surface are drawn into the molten iron by the vortex and are discharged and float under the action of centrifugal force and buoyancy lift force, the entrainment, discharge and float circulation motion of the desulfurizing agents in the molten iron is realized, and the aim of stably achieving the target requirement of molten iron desulphurization is fulfilled through continuous circulation mixed contact and surface reaction of the desulfurizing agents and high-temperature molten iron. Due to the excellent reaction kinetic conditions and the characteristics of stable and reliable deep desulfurization, the method is widely favored by iron and steel enterprises at home and abroad, and becomes a preferred process for deep desulfurization of iron in the production process of low-sulfur and ultra-low-sulfur steel.
According to the introduction of the molten iron KR desulfurization process, the molten iron KR stirring desulfurization reaction process is a molten iron and desulfurizer particle stirring mixed metallurgy reaction process which is completed in an open molten iron tank and a high-temperature metallurgy reactor which is formed by vertically inserting the stirrer along the center of a tank opening, the stirrer inserted into the molten iron tank is driven by a stirring motor to rotate and stir, entrainment circulation and continuous contact reaction of desulfurizer particles in the molten iron are realized, and the task of stable desulfurization of the molten iron is completed. Therefore, for the molten iron KR stirring and desulfurizing system, the main purpose of stirring is to fully roll in and uniformly disperse the desulfurizing agent floating on the liquid surface into the molten iron, so that the desulfurizing agent particles are in efficient mixing contact with the molten iron, the mass transfer distance of the desulfurization reaction is shortened, and the kinetic conditions and the reaction speed of the desulfurization reaction are remarkably improved, so that how to achieve the optimal desulfurizing agent stirring, mixing and dispersing effect with the lowest stirring power consumption is the main purpose of forced stirring of the molten iron KR desulfurization.
Because metallurgical reaction behaviors under the conditions of high temperature, multiple phases and large turbulence in a molten iron KR stirring Desulfurization reactor are very complex, in order to find the entrainment mixing Dispersion Behavior of a desulfurizing agent in molten iron in the molten iron KR stirring Desulfurization process, the documents of Yoshie NAKAI, Ikuhiro SUMI, Hidetoshi MATSUNO and the like, and the effects of fluorine Dispersion behavor on desulphurization of Hot Metal, ISIJ International, Vol.50(2010), No.3, pp.403-410 pass through 1/8 water model and 70 kg-level molten iron tests, the rule of the influence of stirring process parameters on the mixing Dispersion characteristics of the desulfurizing agent in the molten iron is researched, and the mixing Dispersion characteristics of the desulfurizing agent can be divided into three stages along with the change of the stirring process parameters, namely: the "no diffusion" phase, the "transition diffusion" phase and the "full diffusion" phase, i.e.: the stirring vortex depth is increased along with the increase of the stirring rotating speed, when the stirring vortex reaches the top surface of the stirrer blade, no desulfurizer particles are involved in the molten iron, the stage is a 'diffusion-free' stage, when the stirring vortex depth is positioned between the top surface of the blade and the bottom surface of the blade, the desulfurizer is involved in the molten iron, the amount of involved dispersed desulfurizer is increased rapidly along with the increase of the vortex depth, the stage is a 'transition diffusion' stage, when the stirring vortex depth exceeds the bottom surface of the stirrer blade, the amount of the involved dispersed desulfurizer in the molten iron is continuously increased, but the increase amplitude is gradually reduced along with the increase of the vortex depth, and the stage is a 'complete diffusion' stage; defining the ratio of the eddy depth to the bottom surface depth of the liquid level of the stirrer as a diffusion index I, and performing evaluation index of entrainment mixing characteristics of the desulfurizer, wherein when the diffusion index is greater than 1, complete diffusion occurs in a water model test, and in a hot pilot test of molten iron desulfurization, the apparent rate constant of desulfurization reaction is obviously improved; along with the increase of the insertion depth of the stirrer, the initial involving dispersion stirring rotating speed and the complete diffusion rotating speed of the desulfurizer particles are increased, compared with the situation that the insertion depth of the stirrer is half of the molten iron liquid level depth, when the insertion depth of the stirrer is 3/4 molten iron liquid level depth, the initial diffusion rotating speed and the complete diffusion rotating speed are respectively increased by 1/2 and 1/3, the diffusion quantity of the desulfurizer particles in the lower half part area of the molten iron liquid level is obviously increased, and therefore, the expansion of the mixing dispersion area of the desulfurizer particles in the molten iron is facilitated along with the increase of the insertion depth of the stirrer. Although the diffusion index I of the ratio of the vortex depth to the bottom surface depth of the liquid level of the stirrer is given in the text, in the actual stirring desulfurization production of the molten iron KR, the vortex depth cannot be measured due to the accumulation of a large amount of desulfurizing agents at the vortex bottom, and the mixing dispersion condition of the desulfurizing agents cannot be judged due to the non-visibility of the entrainment dispersion process of the desulfurizing agents in the molten iron, so that the practical application value of research results is influenced.
Based on the research results, the design method of the KR desulfurization stirrer for molten iron of the Chinese patent of Euro-Yang Degang, Li-Minghui, Luo-Anzhi, application publication No.: CN 109918834A', found through a large number of water model and digital model experiments that when the vortex bottom of the stirring vortex reaches the bottom surface of the stirrer blade, the stirring, entrainment and dispersion effect of the desulfurizer is appropriate, the stirring process is stable, and the stirring power is reasonable; therefore, the stirring vortex depth is equal to the bottom surface depth of the stirrer blade as a quantification criterion, the vortex structure parameters and the stirring device structure parameters and the theoretical correlation formula among the stirring process parameters are adopted, the corresponding process parameter control values under different molten iron KR stirring desulfurization equipment conditions are determined by calculation for the first time, the structural parameters of the molten iron tank and the stirrer are further optimized based on the limited conditions of partial process parameter variation ranges, the quantification design of the molten iron KR stirring device is completed, the consistency and the scientificity of the design of KR stirring desulfurization devices on different production lines are ensured, and the purposes of stabilizing the desulfurization reaction kinetic conditions and improving the desulfurization technical and economic indexes are achieved. Although the defects of the empirical design of the stirring device are overcome, the optimization result of the process parameters cannot be applied in the actual production due to the factors of incapability of monitoring the stirring vortex depth on line, poor measurement precision of the molten iron liquid level and the like, and the function of guiding the KR stirring desulfurization production operation of the molten iron is difficult to play. In addition, due to the quantitative design target of the proper stirring, entrainment and dispersion effect of the desulfurizer, the optimal stirring and mixing effect cannot be realized, and the corresponding process parameter control range cannot be provided, so that the quantitative criterion of the stirring, entrainment, mixing and dispersion effect of the desulfurizer needs to be further researched, and the design method of the KR desulfurization stirrer for molten iron is perfected.
Aiming at the problems, Chinese patent' Euro-Yang Degang, Wang Xiu, Li Minghui, etc., high-efficiency and low-consumption desulfurization method by mechanical stirring of molten iron, granted bulletin number: CN 108588318B "discloses a stirring desulfurization method comprising eight steps, which mainly comprises: calculating and correcting a conventional model of the adding amount of the desulfurizer and the stirring time; measuring the level height of molten iron and calculating and correcting the insertion depth of the stirrer based on a stirring vortex surface shape equation; monitoring the splash condition of iron filings, controlling the stirring speed under the condition of limiting the maximum stirring speed, and the like. Therefore, the invention is characterized by calculation of the insertion depth of a stirrer and control of the stirring rotating speed based on the shape equation of the stirring vortex surface, focuses on improvement of the stirring desulfurization reaction kinetic condition, and obtains better application effect in actual production, but operators monitor the stirring vortex shape and the iron flower splashing condition through experience analysis and judgment on line to correct and adjust related operation process parameters, and the experience accumulation and judgment level of the operators cannot be kept away.
Aiming at the defects of difficult implementation and low monitoring precision of manual monitoring of stirring vortex form and iron flower splashing condition in the patent, the Chinese patent 'Euonymus fortunei, Liming, Luojiang river and the like, and the application publication No. CN 109666772A' discloses a molten iron KR stirring desulfurization method based on image recognition, which comprises the following four steps: 1) collecting the weight of molten iron and the temperature measurement sampling analysis result of the molten iron, and calculating the stirring time tau, the adding amount W of a desulfurizing agent, the liquid level height H of the molten iron, the insertion depth H0 of the stirrer and the bottom height H-H0 of the stirrer. 2) Monitoring pictures through a high-definition video system to adjust the stirring speed; 3) after the desulfurizer is added, monitoring a picture through a high-definition video system to adjust the stirring speed, and controlling the length L0 of the intersection point of the liquid level of the stirring vortex and the upper surface of the stirrer blade from the central axis of the stirring shaft to be r0+50mm, L0 and less than or equal to 0.7r, wherein r0 is the section circle radius of the stirring shaft along the upper surface of the stirrer blade, and r is the original rotation radius of the stirrer blade; 4) with the advance of the service time of the stirrer, the stirring speed is continuously adjusted until the service of the stirrer is terminated. The invention monitors the characteristic parameters of the shape of the stirring vortex liquid level and the mutual position relation between the stirring vortex liquid level and the stirrer blade on line through high-definition video, realizes the real-time control of the reaction dynamics conditions of the whole molten iron desulphurization stirring process, provides a whole-process visual monitoring means for the actual production operation, solves the defects brought by manual monitoring and empirical judgment, but the implementation effect is limited by the accurate measurement of key parameters, the random and universal accurate judgment of the vortex shape and the accurate control of process parameters, particularly the measurement accuracy of the molten iron liquid level, once the measurement is inaccurate, the accurate control of the insertion depth of the stirrer is directly caused, and finally the loss control of the stirring and mixing effect is caused, in addition, the patent only carries out the rotating speed regulation control by taking r0+50mm < L0 < 0.7r as the judgment standard in the step 3, and can not reflect the amount of the liquid level desulfurizer involved in the molten iron, is not favorable for improving the utilization rate of the desulfurizer.
Aiming at the problem of poor measuring precision of the molten iron liquid level, the Chinese patent 'Oghonglin, Shanghai hong, Wangzhao Qiang, mechanical stirring method molten iron desulphurization system, application publication No. CN 108754071A' indicates that the molten iron liquid level automatic detection is one of the technical difficulties of molten iron KR stirring desulphurization automation, the defects of the prior art are analyzed, and for the method of determining the molten iron liquid level height by measuring the tension change of a steel wire rope of a suspension stirrer driving device in a stirrer whether entering molten iron or not, the measurement error is large and the desulphurization automation degree of the mechanical stirring method is reduced due to the small tension change value. For the laser range finder to measure the liquid level of molten iron, because the molten iron surface often floats with iron slag, the measurement error of the method is larger, the requirement on the installation angle of the laser range finder is more severe, and the use effect is not good enough; therefore, a molten iron liquid level height measurement system is disclosed, including the steel platform, be provided with on the steel platform and wind vertical axis pivoted stirring head, directly over the removal route of stirring head position in hot metal bottle, still include: the binocular camera is used for acquiring distance information between the binocular camera and the liquid level in the molten iron tank; the control processor is used for collecting and processing distance information detected by the binocular camera so as to calculate the height difference between the stirring head and the liquid level in the molten iron tank; and the stirring head driving mechanism is used for driving the stirring head to vertically move according to the height difference calculated by the control processor and controlling the working state by the control processor. Therefore, the core of the patent technology lies in the distance measurement of adopting the binocular camera, but the distance measurement principle and the measurement accuracy assurance of binocular camera fail to explain, and reliability, accuracy of measurement remain to be testified, and in addition, although this patent passes through the rational arrangement of binocular camera, can make partial structural parameter survey in advance, nevertheless in the actual mass production because of the restriction of controlling the precision, relevant parameter fluctuation range is great, is difficult to guarantee molten iron liquid level height measurement's accuracy.
In view of the above disadvantages, chinese patents "wann min, beam army, qi calculation and bin, etc., a method and a device for measuring molten iron depth of a hot metal ladle, which are issued with the following publication numbers: CN103884400B "discloses a hot metal ladle liquid level measuring device composed of a hot metal ladle tipping trolley, a limit collision ruler, a limit switch, a distance meter, a controller and the like, and the measuring method is as follows: the controller control molten iron jar platform truck that tumbles moves to measuring position to limit switch is closed to trigger signal, and the perpendicular distance between liquid level and distancer after control distancer measures the hot metal jar and takes off the sediment obtains clearance height and molten iron liquid level degree of depth after the hot metal jar takes off the sediment through the difference between the perpendicular distance of distancer and hot metal jar top, the distancer be radar level meter, be located the hot metal jar and incline and overturn the platform truck track central line directly over the hot metal jar top and predetermine the height, avoided slag blanket thickness to measuring result's influence and artifical visual estimation precision low not enough. The literature, "wanmin, zhao jia and gao wen, control and research of the insertion accuracy of the KR desulfurization paddle, 2016, No 5", indicates that the key to influence the KR desulfurization effect is that the rotating speed of the paddle and the insertion depth of the molten iron level must be both optimal values to optimize the dynamic conditions of KR treatment. For accurately controlling the insertion depth of the stirrer, a radar level meter is specially adopted as a distance meter, a set of automatic measuring system for molten iron clearance of the hot metal ladle is designed and installed at a molten iron KR desulfurization slag skimming station, and the distance between the level meter and the hot metal ladle is larger than 3m for reducing high-temperature radiation of molten iron high temperature in the hot metal ladle to the level meter. The molten iron depth and the slag layer thickness are calculated and obtained according to the height of a pre-stored level meter in the PLC from the guide rail reference and the height of the molten iron tank opening through measuring the vertical distance between the slag surface of the molten iron before slag removal and the liquid level of the molten iron after slag removal, and the slag removal amount is further calculated and obtained. Through practical production application, the error of molten iron depth measurement is reduced to within 10mm from 100-200 mm. And providing accurate parameters for the secondary model to calculate the optimal insertion depth of the stirring paddle.
In summary, with the continuous development of scientific technology, the parameter detection technology, the stirring mixing characteristic representation technology, the stirring process control technology and the like of the molten iron KR stirring desulfurization process are greatly improved, so that the development of the molten iron KR stirring desulfurization technology is effectively promoted, but the development of the molten iron KR stirring desulfurization technology is limited by the research depth and detection means of the prior art, the effective entrainment dispersion amount of a desulfurizing agent in the molten iron KR stirring process, the accurate judgment of desulfurization reaction kinetics, the optimization of a stirring process model, the accurate regulation and control of stirring process parameters and the like are far from achieving the purpose of efficient desulfurization, the insertion depth and the stirring rotating speed of a stirrer which are key in the core are controlled, the empirical operation of one-key desulfurization model parameter correction and process regulation still needs to be carried out by depending on manual experience, and the development of the molten iron KR efficient intelligent desulfurization technology is restricted.
Disclosure of Invention
The invention aims to provide a molten iron KR stirring and mixing characteristic quantitative characterization method and an intelligent desulfurization method aiming at the defects of the prior art, the stirring and mixing state is rapidly identified and judged through the real-time dynamic detection of KR stirring and mixing characteristic characterization parameters, the insertion depth and the stirring rotation speed of a stirrer are accurately controlled through the establishment of the optimal control range of the stirring and mixing characteristic characterization parameters, the intelligent control of the insertion depth and the rotation speed of the stirrer and the efficient stirring and mixing of a desulfurizer are realized, and the aims of reducing the desulfurization cost, improving the economic index of the desulfurization technology and improving the stability of deep desulfurization are fulfilled.
In order to achieve the aim, the quantitative characterization method for the stirring and mixing characteristics of the molten iron KR comprises the steps of determining quantitative characterization parameters of the stirring and mixing characteristics and setting the control range of the quantitative characterization parameters;
the quantitative characterization parameters of the stirring and mixing characteristics comprise: the device comprises a stirrer blade upper surface intersecting vortex radius R, molten iron liquid level desulfurizer coverage rate eta, a stirrer insertion depth L, a stirrer blade upper surface intersecting vortex radius Rt when desulfurizer is added, a radial distance L1 between a desulfurizer dropping point and a stirring shaft central line when desulfurizer is added, and a stirrer blade upper surface intersecting vortex radius Rj when stirring and desulfurizing;
and (3) quantifying the control range of the characterization parameters: the insertion depth L of the stirrer is half of the molten iron depth h (namely L ═ h/2), the range of Rt is r0+50mm, Rt is more than or equal to 0.624r, the range of L1 is more than Rt, L1 and less than or equal to 0.80r, the range of Rj is more than or equal to 0.624r and less than or equal to 0.85r, and the coverage rate eta of the molten iron liquid surface desulfurizing agent is less than or equal to 10%;
wherein: r0 is the radius of the section circle of the stirring shaft along the upper surface of the stirrer blade, and r is the rotation radius of the stirrer blade.
The intelligent desulfurization method based on the quantitative characterization of the KR stirring and mixing characteristics of the molten iron comprises the following steps:
1) acquiring the loading capacity W of the hot metal ladle according to the weight difference of the hot metal ladle before and after being subjected to iron; after the hot metal tank is conveyed to the slag skimming position, carrying out hot metal temperature measurement and sampling component analysis to obtain the front temperature Tq of hot metal and hot metal components; calculating the amount Wt of molten iron after slagging off before slag skimming, the level Ht of the liquid level of the molten iron and the depth h of the molten iron for storage;
2) transporting the molten iron tank from the slag skimming position to the desulfurization position, and calculating desulfurization stirring time tau and the addition amount Wj of a desulfurizing agent according to the data of the molten iron foretemperature Tq, the molten iron components and the molten iron amount Wt stored in the step 1); according to the molten iron liquid level height Ht and the molten iron depth h in the step 1), calculating the bottom surface elevation Hd of the stirrer blade as Ht-1/2h according to the control requirement that the insertion depth L of the inserted stirrer is half of the molten iron depth h;
3) calculating to obtain the data of the radius R of the intersected vortex at different stirring rotating speeds, and adjusting the speed according to 5-10 revolutions per minute; when the radius R of the intersected vortex is in the control range required by the radius Rt of the feeding intersected vortex, namely R0+50mm < Rt is less than or equal to 0.624R, the stirring rotating speed is controlled to be constant, a feeding groove or a feeding spray pipe is extended for feeding a desulfurizing agent, the radial distance L1 of a feeding falling point of the desulfurizing agent from the central line of the stirring shaft is controlled to be Rt < L1 which is less than or equal to 0.80R, and the feeding of the desulfurizing agent is completed until the calculation and determination are completed;
4) calculating the coverage rate eta of the desulfurizing agent on the molten iron liquid surface, and adjusting the speed according to 5-10 revolutions per minute; when the radius R of the intersected vortex circle of the upper surface of the blade of the stirrer is in the control range required by the radius Rj of the intersected vortex of stirring and desulfurization and the coverage rate eta of a desulfurizing agent on the liquid level of molten iron is less than or equal to 10 percent, keeping the stirring rotating speed unchanged until the desulfurization and stirring are finished, and then lifting the stirrer to a normal waiting station; wherein Rj is required to be controlled within the range of 0.624r to 0.85 r;
5) conveying the molten iron tank subjected to molten iron stirring desulfurization to a slagging-off position, carrying out molten iron temperature measurement and sampling component analysis, and obtaining the desulfurized temperature Th and the desulfurized molten iron component; after the requirement of molten iron desulphurization is met, calculating the weight Wh of slag after molten iron slagging; calculating the obtained molten iron amount Wt and the desulfurizer adding amount Wj according to the molten iron post-slag skimming amount Wh and the molten iron desulfurization temperature drop DeltaT and the molten iron desulfurization skimming amount Wg of the converter after the molten iron desulfurization, wherein the DeltaT is Tq-Th and the Wg is Wt + Wj-Wh;
6) and (3) storing the temperature measurement sampling result of the molten iron obtained in the step 5) and the calculated data of the molten iron desulphurization temperature drop Delta T, the components of the molten iron after desulphurization, and the amount Wg of molten iron transferred to the converter after desulphurization and slagging-off of the molten iron.
Further, the specific process of calculating the molten iron amount Wt, the molten iron liquid level elevation Ht and the molten iron depth h after pre-slagging in the step 1) is as follows:
starting a laser level meter arranged right above the slag-off position molten iron tank, measuring a vertical distance Lz between the molten iron slag surface and the laser level meter, and calculating a molten iron slag surface elevation Hz and a molten iron tank clearance height Ez on the slag surface by utilizing a laser level meter elevation hw, a molten iron tank opening elevation hgk and a tank bottom elevation hgd; then, tipping the hot metal ladle to remove slag before the hot metal is tapped, returning the hot metal ladle, starting the laser level meter, measuring the vertical distance Lt between the liquid level of the hot metal and the level meter, and calculating the liquid level Ht of the hot metal, the clearance height Et of the hot metal ladle on the liquid level and the depth h of the hot metal; calculating the thickness delta of a slag layer according to the height difference between the slag surface of the hot-metal ladle before slag skimming and the liquid level of the molten iron after slag skimming; calculating to obtain a pre-slag-slagging volume Vz, a slagging weight Wz and a pre-slagging and post-slagging molten iron amount Wt according to the inner diameter D of the molten iron tank and the molten iron slag density rho z;
wherein Hz-hw-Lz, Ez-hgk-Hz, Ht-hw-Lt, Et-hgk-Ht, h-Et-hgd, delta-Ez-Et, Vz-delta-pi-D2/4、Wz＝Vz×ρz、Wt＝W-Wz。
Further, in the step 2), the desulfurization stirring time τ and the desulfurization agent addition amount Wj are calculated through a neural network model based on the historical data.
Further, the calculation process of the radius R of the intersected vortex at different stirring speeds in the step 3) is as follows:
the descending stirrer lifting truck drives the stirrer to descend and insert into the molten iron tank until the elevation Hd of the bottom surface of the stirrer is equal to H-1/2H, then a stirring motor is started, the rotating speed of the stirrer is gradually increased, the diameter and the depth of a stirring vortex are continuously increased, and a high-definition video camera arranged above the molten iron tank at the desulfurization position is used for recording a stirring vortex change video image; based on the color difference between the profile and the liquid level, carrying out gray processing on the video image by adopting image recognition software, recognizing and extracting the intersecting vortex circular profile and the stirring shaft profile image of the stirring vortex and the upper surface of the stirrer blade at different rotating speeds, and obtaining the distance p between the intersecting vortex circular profile and the stirring shaft profile, wherein R is R0+ p.
Further, the calculation process of the molten iron liquid surface desulfurizing agent coverage rate η in the step 4) is as follows:
after the desulfurizer is added, the stirring rotation speed is increased, on the basis of the recording of the stirring vortex change video graph in the step 3) and the calculation of the radius R of the intersected vortex circle, on the basis of the color difference between the molten iron surface and the desulfurizer surface, image recognition software is further adopted to perform gray level processing on the video image, the floating distribution state of the desulfurizer on the vortex liquid surface is extracted, the total coverage area St of the desulfurizer on the vortex liquid surface and the total exposed area Sl of the molten iron in the video image are calculated, and then the coverage rate eta of the desulfurizer on the molten iron liquid surface is calculated, namely eta is St/(St + Sl). times.100%.
Further, the calculation process of the weight Wh of the molten iron post-slag in the step 5) is as follows:
according to the method in the step 1), a laser material level meter arranged right above the slagging-off position molten iron tank is started, the level of the molten iron desulphurization slag surface is measured and calculated, then the measurement calculation of the molten iron slagging-off slag and the level of the molten iron liquid surface after desulphurization is carried out, and the slagging-off weight Wh of the molten iron is calculated.
The invention aims at the problem that the stirring and mixing characteristics of molten iron KR can not be sensed and represented quantitatively on line in the prior art, establishes a quantitative characterization method of the stirring and mixing characteristics of the molten iron KR, discovers quantitative relations between the quantitative rules of the stirring and mixing characteristics and vortex structures under different stirrer insertion depths and the quantitative relations between different combinations of related parameters and stirring and mixing uniformity and desulfurizer consumption through a large number of water model tests, digital-analog computational analysis and industrial tests, provides characterization parameters of the stirring and mixing characteristics of the molten iron KR (the intersecting vortex radius R of the upper surface of a stirrer blade and the desulfurizer coverage rate eta of the molten iron liquid surface), and determines a control principle that the insertion depth (the vertical distance from the bottom surface of the stirrer to the static liquid surface of the molten iron) L is half of the molten iron depth h, namely: setting the optimal control range of sectional stirring and mixing characteristic parameters R and eta of the addition and stirring desulfurization of the desulfurizer and the control range of the addition and dropping point of the desulfurizer; by applying the technology, the online depth perception of the entrainment mixing dispersion state of the desulfurizer in the stirring process of the molten iron KR is realized, and the high-efficiency utilization of the desulfurizer in different stirring stages is ensured, wherein in the desulfurizer adding stage, the smooth entrainment of the desulfurizer is ensured, the desulfurizer dust emission is reduced, and the desulfurizer escape loss is reduced by online monitoring of the stirring mixing characteristics and process parameter adjustment; in the stirring desulfurization stage, the high efficiency of the desulfurizer in the molten iron is involved and mixed and dispersed by the online monitoring and the process parameter adjustment of the stirring mixing characteristic, the desulfurizer mixing area is enlarged, the liquid level floating rate of the desulfurizer is reduced, the desulfurization reaction utilization rate of the desulfurizer and the deep desulfurization stability are improved, and therefore, the dynamic condition of the molten iron desulfurization reaction is greatly improved, the consumption of the desulfurizer is reduced, and the economic index of the KR desulfurization technology of the molten iron is obviously improved.
According to the intelligent desulfurization process based on the molten iron KR stirring mixing characteristic quantitative characterization method, the molten iron slag level height, the molten iron liquid level height and the slag skimming amount are accurately measured and calculated through the installation and distance measurement of the molten iron slag skimming position laser material level meter, so that the accurate control of the insertion depth of a stirrer is guaranteed, meanwhile, the defect of the lack of the slag skimming amount in the prior art is overcome, and reliable original data are provided for reducing iron loss measurement caused by molten iron desulfurization and slag skimming. The method has the advantages that the installation of the high-definition video camera of the molten iron desulphurization position and the application of the image recognition software ensure the quick recognition and acquisition of the video image quality and the characterization accurate parameters, and the aim of accurately, quickly and intelligently controlling the stirring rotating speed is fulfilled according to the regulation rate of 5-10 r/min based on the difference of the established control range requirements of the characterization parameters of the desulfurizer adding stage and the stirring desulphurization stage.
According to data reports, the key influencing the KR desulfurization effect is that the rotating speed of the stirring paddle and the insertion depth of the molten iron liquid level must be optimal simultaneously so as to optimize the dynamic conditions of KR treatment. Therefore, the accurate measurement of the liquid level of the molten iron is the core key for accurately controlling the insertion depth of the stirrer, and the collaborative optimization of the insertion depth and the stirring rotating speed of the stirrer is the key for ensuring the dynamic conditions of KR stirring desulfurization of the molten iron. However, most steel mills currently measure the liquid level height of molten iron and the clearance height of a molten iron tank by a visual measurement method, generally, the height of a slag line is visually measured after the molten iron tank is tipped over, and then the molten iron depth is obtained according to the depth structure size of the molten iron tank, wherein the slag amount is an empirically set fixed value and is generally fixed to be 0.6% of the actual loading amount of the molten iron tank; but the deviation of the visual inspection method is large, and the depth error of the general molten iron is 100-200 mm; the principle that the tension of the steel wire rope changes when the stirring paddle goes up and down is also utilized by some steel mills to measure the height of the liquid level, but the tension is basically unchanged when the stirring paddle goes down to the liquid level, when the stirring paddle contacts the liquid level, the tension of the steel wire rope is reduced at once due to the resistance of the molten iron slag surface, the sensor gives a tension change signal, the PLC records the height value of the stirring paddle at the moment, and the clearance value of the molten iron tank is obtained through PLC operation automatic calculation. The method has the advantages that firstly, the measurement error is large due to the influence of uneven distribution positions and thicknesses of slag blocks of the molten iron tank; and the influence of the monitoring fluctuation of the steel wire rope tension sensor is large, and false alarm or no alarm is frequently generated. For the control of the stirring rotating speed and the insertion depth of the stirrer, at present, according to a KR one-key desulfurization experience model of molten iron, the insertion depths of the top surfaces of blades of the stirrer are set by grouping calculation according to the difference between the actual loading total amount of the molten iron tank and the actual service tank age of the molten iron tank, and the rotating speed is regulated and controlled according to the principle that the stirring power and the stirring rotating speed are simultaneously lower than the online setting, so that the fluctuation of the actual insertion depth of the bottom surface of the stirrer is large, the stirring desulfurization rotating speed is high, the stirring power is high, the stirring resonance frequency is frequent, and the like, so that the stirring and mixing effect is poor, the deep desulfurization stability is poor, the desulfurizer consumption is high, the stirring time is long, and the safe and stable operation of the stirring equipment is endangered.
According to the image identification and area measurement method reported in the document "Zhao Songbai, Zan Haiyun, Chenpu Chun, etc.". based on MATLAB irregular area image measurement [ J ]. Automation technology and application, 2012, 31(9), 14-16 ", the invention obtains vortex liquid level digital image in molten iron KR stirring desulfurization process by high-definition video camera, carries out gray level processing on the image by image identification software to obtain gray level of each pixel in the image, then marks each pixel in the image according to different gray level in the image, carries out image region segmentation according to the gray level of the surface coverage of desulfurizing agent, the surface exposed surface of molten iron, the intersected vortex circular contour of the upper surface of stirrer blade and the surface contour of stirring shaft, sums the number of pixel points of the surface coverage of desulfurizing agent and the surface exposed surface of molten iron respectively, and carries out identification and calculation by a plurality of images (more than 5 sheets), obtaining the total area St of a desulfurizing agent covering surface and the total area Sl of a molten iron exposed surface in the image, and calculating to obtain the coverage rate eta of the desulfurizing agent on the molten iron liquid surface, namely: and eta is St/(St + Sl) multiplied by 100%, the intersecting vortex circle profile of the upper surface of the stirrer blade and the surface profile of the stirring shaft are subjected to regional division and connection to obtain the distance p between the intersecting vortex circle profile and the stirring shaft profile, the data of the intersecting vortex circle radius R (R is R0+ p) under different stirring speeds are obtained through calculation, and the accuracy of the molten iron liquid surface desulfurizing agent coverage rate eta and the intersecting vortex circle radius R is ensured through the identification and statistical averaging of a plurality of images (more than 5 images).
According to the data ' but ' bin ', chenquinine, zhanghua and the like ', the molten iron KR desulfurization prediction model based on the neural network, computer application and software, and the method for establishing the molten iron KR desulfurization neural network prediction model provided by 2011 and No1 ', the actual investigation finds that the addition amount of the desulfurizing agent and the quality of the molten iron, the sulfur content in the molten iron, the using times of a stirring head and an iron tank and the temperature of the molten iron are in a positive relation, and the stirring time and the addition amount of the desulfurizing agent are in a positive relation. For this purpose, the model input parameters are determined as: the quality of molten iron, the temperature of the molten iron, the sulfur content in the molten iron, the use times of a stirring head and the use times of an iron tank; the output parameters are: adding the mass of the desulfurizer and the required stirring time. A large amount of historical data of more than one month in actual production is collected as samples to be trained, and a three-layer neural network BP model with an output layer containing 2 neurons, an input layer containing 5 neurons and a hidden layer is constructed. And determining the adding amount of the desulfurizer and the stirring time according to a one-key desulfurization technology application method provided by the literatures of Xucheng clarity, Wang Anjun, Liao, Dingjin, KR method molten iron desulfurization technology and one-key desulfurization technology, Wu Steel technology, 2013 and No2, wherein the calculation of the adding amount of the desulfurizer takes a large amount of high-quality data in the early stage as samples, sample data is counted by repeated training of the model, and the acquired original data (molten iron weight, early temperature, early sulfur and the like) are only required to be input into the model in production, so that the required desulfurization dose of the tank can be automatically calculated. The stirring time is designed to be set according to the desulfurization dose, and is also adjusted slightly according to the front temperature of the molten iron and the front silicon content.
In conclusion, the method overcomes the problems of inaccurate empirical control of the insertion depth and the stirring rotating speed of the stirrer, large fluctuation of the dynamic condition of the desulfurization reaction, poor deep desulfurization stability and the like in the conventional molten iron KR stirring desulfurization process, provides a reliable quantitative characterization method for efficient stirring and mixing of the molten iron KR, and provides a novel accurate and intelligent operation control process for low-cost and stable desulfurization of the molten iron KR.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The quantitative characterization method for the KR stirring and mixing characteristics of the molten iron comprises the steps of determining quantitative characterization parameters of the stirring and mixing characteristics and setting the control range of the quantitative characterization parameters;
the quantitative characterization parameters of the stirring and mixing characteristics comprise: the device comprises a stirrer blade upper surface intersecting vortex radius R, molten iron liquid surface desulfurizer coverage rate eta, a stirrer insertion depth (vertical distance from the bottom surface of the stirrer to the static liquid surface of molten iron) L, a stirrer blade upper surface intersecting vortex radius Rt when desulfurizer is added, a radial distance L1 from a desulfurizer dropping point to a stirring shaft central line when desulfurizer is added, and a stirrer blade upper surface intersecting vortex radius Rj when stirring desulfurization;
and (3) quantifying the control range of the characterization parameters: the insertion depth L of the stirrer is half of the molten iron depth h (namely L ═ h/2), the range of Rt is r0+50mm, Rt is more than or equal to 0.624r, the range of L1 is more than Rt, L1 and less than or equal to 0.80r, the range of Rj is more than or equal to 0.624r and less than or equal to 0.85r, and the coverage rate eta of the molten iron liquid surface desulfurizing agent is less than or equal to 10%;
wherein: r0 is the radius of the section circle of the stirring shaft along the upper surface of the stirrer blade, and r is the rotation radius of the stirrer blade.
The intelligent desulfurization method based on the KR stirring mixing characteristic quantitative representation of the molten iron comprises the following specific steps:
1) according to the front and back scale of the molten iron tank receiving ironObtaining the loading amount W of the hot metal ladle by the weight difference; after the molten iron tank is conveyed to a slagging-off position, carrying out molten iron temperature measurement and sampling component analysis to obtain the molten iron front temperature Tq and molten iron components (the molten iron components mainly comprise S, Si, Mn and C); starting a laser level meter MSE-SL30 (the measuring range is 30 meters, the repetition precision is +/-0.5 mm) arranged right above a slag-raking position molten iron tank, measuring the vertical distance Lz between the molten iron slag surface and the laser level meter, and calculating the molten iron slag surface elevation Hz (Hz-hw-Lz) and the molten iron tank height clearance Ez (Ez-hgk-Hz) on the slag surface by using the laser level meter elevation hw, the molten iron tank opening elevation hgk and the tank bottom elevation hgd; then, tipping the hot metal ladle to remove slag before the hot metal is removed, returning the hot metal ladle to the position, starting the laser level meter, measuring the vertical distance Lt between the liquid level of the hot metal and the level meter, and calculating the liquid level height Ht (Ht-hw-Lt), the clearance height Et (Et-hgk-Ht) of the hot metal ladle on the liquid level and the depth h (h-Et-hgd) of the hot metal; calculating the thickness delta of a slag layer (delta-Ez-Et) according to the level difference between the slag surface of the hot-metal ladle before slag skimming and the liquid level of the molten iron after slag skimming; according to the inner diameter D of the hot metal ladle and the density rhoz of the molten iron slag, calculating to obtain a molten iron pre-slag raking volume Vz (Vz is delta x pi x D)2(vi)/4), slag skimming weight Wz (Wz is Vz multiplied by rhoz) and pre-slag skimming molten iron amount Wt (Wt is W-Wz); uploading data of the front temperature Tq of molten iron, the components of the molten iron, the quantity Wt of molten iron, the height Ht of the level of the molten iron and the depth h of the molten iron to a secondary computer of a molten iron KR stirring and desulfurizing control system (the molten iron KR stirring and desulfurizing control system is a control system in a one-key desulfurizing technology application method provided by the literature 'Xucheng Cheng Shen, Wang Anjun, Liao, Dingjin Fang, KR method molten iron desulfurizing technology and one-key desulfurizing technology, Wu Steel technology, No 2013, No 2');
2) the method comprises the steps of carrying out operation on a molten iron tank from a slagging-off position to a desulfurization position, uploading molten iron front temperature Tq, molten iron components and molten iron amount Wt data to a secondary computer according to the step 1), and calculating desulfurization stirring time tau and desulfurizer addition Wj by using historical data built in the secondary computer through a neural network model (the neural network model is 'but bin, Chen-quinine, Zhang and the like, a molten iron KR desulfurization prediction model based on a neural network, computer application and software, and a molten iron KR desulfurization neural network prediction model establishing method provided by 2011, No 1'); according to the molten iron liquid level height Ht and the molten iron depth h uploaded to the secondary computer in the step 1), calculating the agitator blade bottom surface elevation Hd-Ht-1/2 h according to the control requirement that the insertion depth L of the inserted agitator is half of the molten iron depth h;
3) the descending stirrer lifting truck drives the stirrer to descend and insert into the molten iron tank until the elevation Hd of the bottom surface of the stirrer is equal to H-1/2H, then a stirring motor is started, the rotating speed of the stirrer is gradually increased, the diameter and the depth of a stirring vortex are continuously increased, and a high-definition video camera arranged above the molten iron tank at the desulfurization position is used for recording a stirring vortex change video image; based on the profile and liquid level chromatic aberration, performing gray level processing on a video image by adopting image recognition software, recognizing and extracting intersecting vortex circular profiles and stirring shaft profile images of the stirring vortex and the upper surface of the stirrer blade at different rotating speeds, acquiring the distance p between the intersecting vortex circular profiles and the stirring shaft profiles, calculating to obtain intersecting vortex circular radius R (R is R0+ p) data at different stirring rotating speeds, and adjusting the speed according to 5-10R/min; when the radius R of the intersected vortex is in the control range required by the radius Rt of the feeding intersected vortex, namely R0+50mm < Rt is less than or equal to 0.624R, the stirring speed is controlled to be unchanged, a feeding groove or a feeding spray pipe is extended for feeding a desulfurizing agent, the radial distance L1 of the feeding falling point of the desulfurizing agent from the central line of the stirring shaft is controlled to be Rt < L1 which is less than or equal to 0.80R, and the feeding of the desulfurizing agent is completed after the calculation and determination are finished;
4) after the desulfurizer is added, improving the stirring rotation speed, on the basis of the record of the stirring vortex change video image in the step 3) and the calculation of the radius R (R is R0+ p) of the intersected vortex circle, further adopting image recognition software in a secondary computer to perform gray level processing on the video image based on the color difference between the molten iron surface and the desulfurizer surface, extracting the floating distribution state of the vortex liquid surface desulfurizer, calculating the total coverage area St of the vortex liquid surface desulfurizer and the total exposure area Sl of the molten iron in the video image, and calculating to obtain the coverage rate eta of the molten iron liquid surface desulfurizer, namely: eta is St/(St + Sl) multiplied by 100%, and the regulation rate is 5-10 r/min; when the intersected vortex radius R of the upper surface of the stirrer blade is in the control range required by the stirring desulfurization intersected vortex radius Rj (Rj is more than or equal to 0.624R and less than or equal to 0.85R) and the coverage rate eta of the desulfurizing agent on the molten iron liquid surface is less than or equal to 10 percent, keeping the stirring rotating speed unchanged until the desulfurization stirring is finished, and then lifting the stirrer to a normal waiting station;
5) conveying the molten iron tank subjected to molten iron stirring desulfurization to a slagging-off position, carrying out molten iron temperature measurement and sampling component analysis, and obtaining the desulfurized temperature Th and the desulfurized molten iron components (the molten iron components comprise S, Si, Mn and C); after the molten iron desulphurization requirement is met, according to the method in the step 1), starting a laser level meter arranged right above a slagging-off position molten iron tank, measuring and calculating the molten iron desulphurization slag surface elevation, then measuring and calculating the slag after molten iron slagging-off and the molten iron liquid surface elevation after desulphurization, and calculating the slagging-off weight Wh of the molten iron after slag-off; calculating the obtained molten iron amount Wt, the desulfurizer adding amount Wj and the post-slag skimming amount Wh according to the step 1), and calculating to obtain a molten iron desulphurization temperature drop delta T (delta T-Tq-Th) and a molten iron desulphurization and slag skimming iron amount Wg (Wg-Wt + Wj-Wh) delivered to a converter;
6) uploading the temperature measurement sampling result of the molten iron obtained in the step 5) and the calculated molten iron desulphurization temperature drop Delta T, the components of the molten iron after desulphurization, and the Wg data of the molten iron amount of the converter after desulphurization and slagging-off to a secondary computer of a control system and a converter process control system, and supplementing and perfecting a KR desulphurization database of the molten iron; and finally, finishing the desulphurization pretreatment of the molten iron in one tank and the transmission and storage of related data information.
Claims (1)
1. The utility model provides an intelligent desulfurization method based on KR stirring mixing characteristic quantization of characteristics which characterized in that: the quantitative characterization method for the KR stirring and mixing characteristics of the molten iron comprises the steps of determining quantitative characterization parameters of the stirring and mixing characteristics and setting the control range of the quantitative characterization parameters;
the quantitative characterization parameters of the stirring and mixing characteristics comprise: the device comprises a stirrer blade upper surface intersecting vortex radius R, molten iron liquid level desulfurizer coverage rate eta, a stirrer insertion depth L, a stirrer blade upper surface intersecting vortex radius Rt when desulfurizer is added, a radial distance L1 between a desulfurizer dropping point and a stirring shaft central line when desulfurizer is added, and a stirrer blade upper surface intersecting vortex radius Rj when stirring and desulfurizing;
and (3) quantifying the control range of the characterization parameters: the insertion depth L of the stirrer is half of the molten iron depth h, the range of Rt is r0+50mm which is more than Rt and less than or equal to 0.624r, the range of L1 is Rt which is more than L1 and less than or equal to 0.80r, the range of Rj is more than or equal to 0.624r and less than or equal to 0.85r, and the coverage rate eta of a desulfurizing agent on the molten iron surface is less than or equal to 10%;
wherein: r0 is the section radius of the stirring shaft along the upper surface of the stirrer blade, and r is the rotation radius of the stirrer blade;
the desulfurization method comprises the following steps:
1) acquiring the loading capacity W of the hot metal ladle according to the weight difference of the hot metal ladle before and after being subjected to iron; after the hot metal tank is conveyed to the slag skimming position, carrying out hot metal temperature measurement and sampling component analysis to obtain the front temperature Tq of hot metal and hot metal components; calculating the amount Wt of molten iron after slagging off before slag skimming, the level Ht of the liquid level of the molten iron and the depth h of the molten iron for storage;
the specific process of calculating the molten iron amount Wt, the molten iron liquid level elevation Ht and the molten iron depth h before and after slagging-off in the step 1) is as follows:
starting a laser material level meter arranged right above the slag-off position molten iron tank, measuring a vertical distance Lz between the molten iron slag surface and the laser material level meter, and calculating a molten iron slag surface elevation Hz and a molten iron tank clearance height Ez on the slag surface by utilizing a laser material level meter elevation hw, a molten iron tank opening elevation hgk and a tank bottom elevation hgd; then, tipping the hot metal ladle to remove slag before the hot metal is tapped, returning the hot metal ladle, starting the laser level meter, measuring the vertical distance Lt between the liquid level of the hot metal and the level meter, and calculating the liquid level elevation Ht of the hot metal, the clearance height Et of the hot metal ladle on the liquid level and the depth h of the hot metal; calculating the thickness delta of a slag layer according to the height difference between the slag surface of the hot-metal ladle before slag skimming and the liquid level of the molten iron after slag skimming; calculating to obtain a pre-slag-slagging volume Vz, a slagging weight Wz and a pre-slagging and post-slagging molten iron amount Wt of the molten iron tank according to the inner diameter D of the molten iron tank and the molten iron slag density rho z;
wherein Hz-hw-Lz, Ez-hgk-Hz, Ht-hw-Lt, Et-hgk-Ht, h-Et-hgd, delta-Ez-Et, Vz-delta-pi-D2/4、Wz＝Vz×ρz、Wt＝W-Wz；
2) Transporting the molten iron tank from the slagging-off position to the desulfurization position, and calculating desulfurization stirring time tau and desulfurizer adding amount Wj according to the molten iron foretemperature Tq, molten iron components and molten iron amount Wt data stored in the step 1); according to the molten iron liquid level height Ht and the molten iron depth h in the step 1), calculating the bottom surface elevation Hd of the stirrer blade as Ht-1/2h according to the control requirement that the insertion depth L of the stirrer is half of the molten iron depth h;
3) calculating to obtain the data of the radius R of the intersected vortex at different stirring rotating speeds, and adjusting the speed according to 5-10 revolutions per minute; when the radius R of the intersected vortex is in the control range required by the radius Rt of the feeding intersected vortex, namely R0+50mm < Rt is less than or equal to 0.624R, the stirring speed is controlled to be unchanged, a feeding groove or a feeding spray pipe is extended for feeding a desulfurizing agent, the radial distance L1 of the feeding falling point of the desulfurizing agent from the central line of the stirring shaft is controlled to be Rt < L1 which is less than or equal to 0.80R, and the feeding of the desulfurizing agent is completed after the calculation and determination are finished;
the calculation process of the radius R of the intersected vortex at different stirring speeds in the step 3) is as follows:
the stirrer is driven by a descending stirrer lifting truck to descend and be inserted into the hot metal ladle until the elevation Hd of the bottom surface of the stirrer is equal to H-1/2H, then a stirring motor is started, the rotating speed of the stirrer is gradually increased, the diameter and the depth of a stirring vortex are continuously increased, and a high-definition video camera arranged above the hot metal ladle at the desulfurization position is used for recording a stirring vortex change video image; based on the profile and liquid level chromatic aberration, performing gray level processing on the video image by adopting image recognition software, recognizing and extracting the intersecting vortex circular profile and the stirring shaft profile image of the stirring vortex and the upper surface of the stirrer blade at different rotating speeds, and acquiring the distance p between the intersecting vortex circular profile and the stirring shaft profile, wherein R is R0+ p
4) Calculating the coverage rate eta of the desulfurizing agent on the molten iron liquid surface, and adjusting the speed according to 5-10 revolutions per minute; when the radius R of the intersected vortex circle of the upper surface of the blade of the stirrer is in the control range required by the radius Rj of the intersected vortex of stirring and desulfurization and the coverage rate eta of the desulfurizing agent on the liquid level of the molten iron is less than or equal to 10 percent, keeping the stirring rotating speed unchanged until the desulfurization stirring is finished, and then lifting the stirrer to a normal waiting station; wherein Rj is required to be controlled within the range of 0.624r to 0.85 r;
the calculation process of the coverage rate eta of the molten iron liquid surface desulfurizing agent in the step 4) is as follows:
after the desulfurizer is added, improving the stirring rotation speed, performing gray level processing on the video image based on the color difference between the molten iron surface and the desulfurizer surface and further adopting image recognition software on the basis of the recording of the stirring vortex change video image in the step 3) and the calculation of the radius R of the intersected vortex circle, extracting the floating distribution state of the desulfurizer on the vortex liquid surface, calculating the total coverage area St of the desulfurizer on the vortex liquid surface and the total exposed area Sl of the molten iron in the video image, and then calculating to obtain the coverage rate eta of the desulfurizer on the molten iron liquid surface, namely eta which is St/(St + Sl). times.100%;
5) conveying the molten iron tank subjected to molten iron stirring desulfurization to a slagging-off position, carrying out molten iron temperature measurement and sampling component analysis, and obtaining the desulfurized temperature Th and the desulfurized molten iron component; after the molten iron desulphurization requirement is met, calculating the weight Wh of the slag after the molten iron is removed; calculating the obtained molten iron amount Wt and the desulfurizer adding amount Wj according to the molten iron post-slag skimming amount Wh and the molten iron desulfurization temperature drop DeltaT and the molten iron desulfurization skimming amount Wg of the converter after the molten iron desulfurization, wherein the DeltaT is Tq-Th and the Wg is Wt + Wj-Wh;
the calculation process of the weight Wh of the slag after molten iron in the step 5) is as follows:
according to the method in the step 1), starting a laser material level meter arranged right above a slagging-off position molten iron tank, measuring and calculating the level of the desulfurized slag surface of molten iron, then measuring and calculating the slag after the molten iron is subjected to slagging-off and the level of the liquid level of the desulfurized molten iron, and calculating the slagging-off weight Wh of the molten iron after the molten iron is subjected to slagging-off;
6) and (3) storing the temperature measurement sampling result of the molten iron obtained in the step 5) and the data of the molten iron desulphurization temperature drop Delta T, the molten iron components after desulphurization, the molten iron desulphurization slag removal and the molten iron amount Wg of the converter.
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| EP0040044A1 (en) * | 1980-05-10 | 1981-11-18 | Foseco International Limited | Method for the manufacture of desulphurisation agents |
| CN102471814A (en) * | 2009-06-30 | 2012-05-23 | 杰富意钢铁株式会社 | Method of desulfurization of molten iron |
| CN103884400A (en) * | 2014-04-09 | 2014-06-25 | 莱芜钢铁集团有限公司 | Method and device for measuring depth of hot metal in hot metal bottle |
| CN108342536A (en) * | 2018-03-09 | 2018-07-31 | 武汉钢铁有限公司 | Desulfurizing iron is with from pulse blender |
| CN108588318A (en) * | 2018-05-22 | 2018-09-28 | 武汉钢铁有限公司 | Molten iron mechanical agitation efficient low-consume sulfur method |
| CN109666772A (en) * | 2019-02-28 | 2019-04-23 | 武汉钢铁有限公司 | Molten iron KR stirring desulphurization method based on image recognition |
| CN109918834A (en) * | 2019-03-21 | 2019-06-21 | 武汉钢铁有限公司 | Molten iron KR desulfurization agitator design method |
| CN111394535A (en) * | 2020-03-30 | 2020-07-10 | 安徽工业大学 | Step-by-step KR stirring desulfurization method for molten iron |
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