CN115404307B - Preparation method of electric furnace smelting riveting screw steel ML20 - Google Patents
Preparation method of electric furnace smelting riveting screw steel ML20 Download PDFInfo
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- CN115404307B CN115404307B CN202211114017.0A CN202211114017A CN115404307B CN 115404307 B CN115404307 B CN 115404307B CN 202211114017 A CN202211114017 A CN 202211114017A CN 115404307 B CN115404307 B CN 115404307B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C2005/5288—Measuring or sampling devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of steel materials, in particular to a preparation method of electric furnace smelting rivet-screw steel ML20, which comprises the following steps: detecting the inner boundary of the slag in the electric furnace by using a detection device, and transmitting the geometric figure of the inner boundary to a server; preliminarily judging the current desulfurization and dephosphorization conditions according to the geometric figure of the inner boundary of the slag, and controlling the speed of blowing oxygen; after controlling the electric furnace to tap steel, detecting the inner boundary of slag in the electric furnace after preset time so as to judge whether furnace shaking treatment is needed or not; controlling a closed outlet of the electric furnace to shake, detecting the diameter of slag in the electric furnace through a detection device, and judging that the electric furnace needs to be cleaned by a server if the diameter of the slag is larger than a preset diameter; by detecting the forms of the molten steel and the slag in the electric furnace in real time and utilizing the server to timely adjust the smelting process of the electric furnace, the efficiency of smelting the rivet screw steel by the electric furnace is effectively improved, and meanwhile, the loss of the electric furnace is reduced, so that the quality of smelting the rivet screw steel by the electric furnace is effectively improved.
Description
Technical Field
The invention relates to the technical field of steel materials, in particular to a preparation method of electric furnace smelting rivet-screw steel ML 20.
Background
The rivet-screw steel as a high-performance alloy has extremely strict requirements on the component content, and the nitrogen and phosphorus removal efficiency of the rivet-screw steel is an important contradiction limiting the smelting efficiency and the smelting quality during electric furnace smelting. Chinese patent publication No.: CN114085947A discloses a preparation method of electric furnace smelting rivet-screw steel ML20, wherein two annealing furnaces are arranged to cool steel in turn, so that the annealing efficiency of the steel is improved, and the time is saved; chinese patent publication No.: CN104232837A discloses a converter/electric furnace steel tapping monitoring device and a control method, by arranging an infrared detector A arranged at the steel tapping side of a furnace, an infrared detector B arranged at the slag pouring side of the furnace, and a camera arranged above a ladle steel tapping position, the omnibearing monitoring of the converter/electric furnace steel tapping is realized, thereby reducing the steel slag flowing into the ladle and improving the quality of molten steel; chinese patent publication No.: CN114150099A discloses an intelligent centralized control method for steelmaking, which utilizes a mode of establishing a steelmaking process flow to improve the operating environment and simplify operators.
Therefore, the technical scheme has the following problems: it is difficult to improve the nitrogen and phosphorus removal efficiency during steel making by controlling the electric furnace smelting process.
Disclosure of Invention
Therefore, the invention provides a preparation method of electric furnace smelting rivet-screw steel ML 20. The method is used for overcoming the problem that the nitrogen and phosphorus removal efficiency during steelmaking is difficult to be improved by controlling the smelting process of the electric furnace in the prior art, so that the quality of the electric furnace smelting riveting screw steel is improved.
In order to achieve the aim, the invention provides a preparation method of electric furnace smelting rivet-screw steel ML20, which comprises the following steps:
s1, detecting an inner boundary of slag in the electric furnace by using a detection device, and transmitting a geometric figure of the inner boundary to a server;
s2, the server preliminarily judges the current desulfurization and dephosphorization conditions according to the geometric figure of the inner boundary of the slag, and controls the oxygen blowing rate of the electric furnace;
s3, after the server controls the electric furnace to tap steel, the detection device detects the inner boundary of the slag in the electric furnace after preset time, and if the area of a geometric figure formed by the inner boundary of the slag is smaller than a preset area, the server judges that furnace shaking processing is needed;
s4, the server controls the electric furnace closed outlet to shake when the server judges that furnace shaking processing is needed, the diameter of slag in the electric furnace is detected through the detection device, if the diameter of the slag is larger than a preset diameter, the server judges that the electric furnace needs to be cleaned, and if the diameter of the slag is smaller than the preset diameter, the server judges that the smelting process is normal;
by means of increasing the reaction contact surface, the desulfurization and dephosphorization efficiency of the electric furnace during smelting of the riveting screw steel is improved, so that the smelting quality of the riveting screw steel is improved.
Further, when the electric furnace is used for smelting, the server controls the detection device to observe the boundary condition of the slag in the furnace through a periscope so as to judge the smelting condition in the furnace.
Further, when smelting is carried out, the detection device shoots a boundary image of slag and molten steel in the electric furnace and transmits the image to the server, for the ith shot image, the server sets the area enclosed by the slag and the molten steel in the image as Si, wherein i =1,2,3, \8230, n is the maximum shooting frequency, a first preset area S alpha and a second preset area S beta are arranged in the server, wherein S alpha is more than 0 and less than S beta, the first preset area S alpha is the minimum reaction area, the second preset area S beta is the maximum reaction area, the server compares Si with S alpha and S beta to judge the desulfurization and dephosphorization efficiency in the current smelting process,
if Si is less than S alpha, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process is lower than a preset standard, and increases the oxygen introduction rate;
if the S alpha is less than or equal to Si and less than S beta, the server preliminarily judges that the desulfurization and dephosphorization efficiency in the current smelting process meets the preset standard, and further judges the hardness of the slag according to the appearance of the slag;
and if the S beta is not more than Si, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process meets the preset standard and does not adjust the oxygen introduction rate.
Further, when the server further judges the hardness of the slag according to the appearance of the slag, the maximum diameter of the j-th slag shot once is Dj, wherein j =1,2,3, \8230, m, m is the maximum slag quantity shot once, the maximum standard diameter D0 of a single slag block is arranged in the server, the server compares the Dj with the D0 to further judge the desulfurization and dephosphorization efficiency in the current smelting process,
if the maximum diameter Dj of any one piece of slag in single shooting meets the condition that Dj is less than or equal to D0, the server judges that the desulfurization and dephosphorization efficiency of the electric furnace meets the preset standard and does not adjust the oxygen introduction rate;
and if the maximum diameter Dj of any one piece of slag in single shooting meets the condition that Dj is larger than D0, the server judges that the desulfurization and dephosphorization efficiency of the electric furnace is lower than a preset standard, and simultaneously controls the electric furnace to start cleaning the slag.
Further, after the electric furnace is subjected to single tapping, the detection device shoots a boundary image of slag and molten steel in the electric furnace after delaying preset time and transmits the image to the server, for the image Si shot at the ith time, a third preset area S gamma is arranged in the server, wherein the third preset area S gamma is a waste material image threshold value, the server compares Si with S gamma to judge the image efficiency of the slag in the current smelting process on desulfurization and dephosphorization and judges whether to carry out furnace shaking treatment on the electric furnace according to the comparison result,
if Si is less than S gamma, the server judges that the occupied surface area of the slag in the current smelting process is higher than a preset standard, so that the desulfurization and dephosphorization efficiency of the electric furnace is judged to be lower than the preset standard, and the electric furnace is controlled to shake in a preset amplitude so as to reduce the occupied surface area of the slag;
and if the Si is larger than or equal to the S gamma, the server judges that the occupied surface area of the slag in the current smelting process is smaller than a preset standard, so that the desulfurization and dephosphorization efficiency of the electric furnace is judged to meet the preset standard, and the electric furnace is controlled to shake.
Further, when the server controls the electric furnace to shake, the detection device waits for a preset time to shoot a boundary image of slag and molten steel in the electric furnace and transmits the image to the server, a preset maximum shaking slag diameter threshold value D delta is set in the server for the diameter Dj of the jth slag, the server compares the Dj with the D delta to judge the hardness of the slag,
if Dj of any one piece of slag in single shooting is smaller than D delta, the server judges that the slag accumulation in the electric furnace is smaller than a preset size and the hardness is lower than a preset standard, and simultaneously judges that the slag does not need to be cleaned;
and if Dj of any one piece of slag in single shooting is larger than or equal to Ddelta, the server judges that the slag accumulation in the electric furnace is larger than a preset size and the hardness is higher than a preset standard, and controls the electric furnace to start cleaning the slag.
Further, when the electric furnace is used for tapping, the server controls the cleaning valve to be opened so as to clean the periscope arranged on the detection device, and therefore the dust attached to the periscope in the electric furnace steel making process is prevented from affecting the observation result of the detection device.
Further, when the server controls the electric furnace to shake, the electric furnace closes the steel tapping hole, and controls the electric furnace to shake in a reciprocating manner for a preset number of times by taking the steel tapping angle of the electric furnace as the maximum inclination angle.
Further, when the server controls the electric furnace to shake, the electrodes in the electric furnace are lifted away from the molten steel to avoid damage to the electrodes.
Further, when the server judges that the single smelting enters the oxidation period, the server controls the detection device to shoot.
Compared with the prior art, the method has the beneficial effects that the smelting process of the electric furnace is timely adjusted by using the server in a mode of detecting the forms of the molten steel and the slag in the electric furnace in real time, so that the efficiency of smelting the rivet screw steel by the electric furnace is effectively improved, the loss of the electric furnace is reduced, and the quality of smelting the rivet screw steel by the electric furnace is effectively improved.
Further, through setting up detection device to the mode that sets up the periscope on detection device observes the electric stove and smelts the condition of smelting when riveting the spiral shell steel, when effectively having avoided causing being difficult to observe in the electric stove because of high temperature, has promoted the visibility of smelting the process, thereby has further promoted the quality that the spiral shell steel was riveted in the electric stove smelting.
Furthermore, the efficiency of the redox reaction is judged by analyzing the ratio of the surface area of the molten steel to the surface area of the slag through a server, so that the waste of oxygen is effectively avoided, and the quality of the electric furnace smelting rivet steel is further improved.
Furthermore, the impurity condition in the electric furnace is judged by analyzing the shape of the slag, so that the accuracy of judging the running condition of the electric furnace is effectively improved, and the quality of the electric furnace smelting riveting steel is further improved.
Further, the electric furnace is shaken to disturb slag distribution in the electric furnace, so that the nitrogen and phosphorus removal efficiency is improved while the smelting reaction contact surface is effectively improved, and the quality of the electric furnace smelting riveting steel is further improved.
Furthermore, through the mode of cleaning the periscope in the time of no waste gas in the electric furnace, the quality of the electric furnace smelting riveting steel is further improved while the image stability is effectively ensured.
Further, the electric furnace is rocked by the application of the tapping function of the electric furnace, so that the structural safety of the electric furnace is effectively guaranteed, and the quality of the electric furnace smelting riveting steel is further improved.
Further, the maximum inclination angle of the electric furnace is used as the maximum shaking amplitude, so that the quantity of electric furnace modification engineering is effectively reduced, and the quality of electric furnace smelting rivet steel is further improved.
Further, when the electric furnace shakes, the electrode is lifted away from the molten steel, the safety of the electrode is effectively guaranteed, and meanwhile the quality of the electric furnace smelting riveting steel is further improved.
Furthermore, through the mode of observing the interior of the electric furnace at enough time intervals, the detection accuracy is effectively improved, and meanwhile, the quality of the electric furnace smelting riveting steel is further improved.
Drawings
FIG. 1 is a flow chart of a preparation method of electric furnace smelting rivet-screw steel ML 20;
FIG. 2 is a block diagram showing the structure of an apparatus using the production method of the present invention;
FIG. 3 is a schematic view of the position of a periscope according to an embodiment of the present invention;
FIG. 4 is a schematic view of a periscope according to an embodiment of the present invention;
wherein: 1: a periscope; 11: a purge tube; 12: a middle lens; 13: an observation lens; 14: a purge hole; 2: a dust collecting port; 3: and an electrode.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a flow chart of a method for manufacturing rivet-screw steel ML20 by electric furnace smelting according to the present invention. The preparation method of the electric furnace smelting rivet-screw steel ML20 comprises the following steps:
s1, detecting an inner boundary of slag in the electric furnace by using a detection device, and transmitting a geometric figure of the inner boundary to a server;
s2, preliminarily judging the current desulfurization and dephosphorization conditions by the server according to the geometric figure of the inner boundary of the slag, and controlling the oxygen blowing rate of the electric furnace;
s3, after the server controls the electric furnace to tap steel, detecting the inner boundary of the slag in the electric furnace by the detection device after preset time, and if the area of a geometric figure formed by the inner boundary of the slag is smaller than a preset area, judging that furnace shaking treatment needs to be carried out by the server;
s4, when the server judges that furnace shaking is needed, controlling a closed outlet of the electric furnace to shake, detecting the diameter of slag in the electric furnace through a detection device, judging that the electric furnace needs to be cleaned if the diameter of the slag is larger than a preset diameter, and judging that the smelting process is normal if the diameter of the slag is smaller than the preset diameter;
by means of increasing the reaction contact surface, the desulfurization and dephosphorization efficiency of the electric furnace during smelting the riveting screw steel is improved, so that the smelting quality of the riveting screw steel is improved.
FIG. 2 is a block diagram of an apparatus using the manufacturing method of the present invention. The device using the preparation method comprises an electric furnace, a server and a detection device. Wherein the content of the first and second substances,
the electric furnace is used for smelting the rivet screw steel, the top of the electric furnace is provided with a dust collecting port for collecting waste gas generated in the smelting process, a periscope is arranged above the dust collecting port for observing the smelting condition in the electric furnace, and the collected smelting condition is transmitted to a detection device through a lens arranged in the periscope; the server is connected with the detection device and the electric furnace and is used for observing the smelting condition in the electric furnace, judging the smelting action required by smelting according to the smelting condition and controlling the electric furnace to perform corresponding smelting action; the monitoring device is connected with the periscope and used for collecting smelting conditions in the electric furnace.
By detecting the forms of the molten steel and the slag in the electric furnace in real time and utilizing the server to timely adjust the smelting process of the electric furnace, the efficiency of smelting the rivet screw steel by the electric furnace is effectively improved, and meanwhile, the loss of the electric furnace is reduced, so that the quality of smelting the rivet screw steel by the electric furnace is effectively improved.
The detection device is arranged outside the dust collecting port of the electric furnace and is provided with a periscope device to prevent the detection device from damaging components due to high temperature and/or waste gas and collect the boundary condition of slag in the electric furnace during smelting of the electric furnace.
Through setting up detection device to the mode that sets up the periscope on detection device observes the electric stove and smelts the condition of smelting when riveting the spiral shell steel, when effectively having avoided causing being difficult to the observation in the electric stove because of the high temperature, has promoted the visibility of smelting process, thereby has further promoted the quality that the spiral shell steel was riveted in the electric stove smelting.
Please refer to fig. 3, which is a schematic position diagram of the periscope of the present invention.
The periscope 1 is arranged on one side, far away from the electrode 3, near the dust collection port 2 so as to observe the interior of the electric furnace; the dust collecting port 2 is positioned on one side of the top of the electric furnace, which is far away from the center, and is used for collecting waste gas generated in the smelting of the electric furnace; the electrode 3 is arranged above the electric furnace, and the energy source of the electrode is arranged outside the electric furnace so as to provide energy for smelting in the electric furnace; when the server controls the detection device to work, the detection device receives images in the electric furnace through the dust collection port 2 through the periscope 1 so as to provide the images in the electric furnace for the server.
When the device is used for smelting, the detection device shoots a boundary image of slag and molten steel in the electric furnace and transmits the boundary image to the server, for the ith shot image, the server sets the area enclosed by the slag and the molten steel as Si, wherein i =1,2,3, \8230, n is the maximum shooting frequency, a first preset area S alpha and a second preset area S beta are arranged in the server, wherein S alpha is more than 0 and less than S beta, the first preset area S alpha is the minimum reaction area, the second preset area S beta is the maximum reaction area, the server compares the Si with the S alpha and the S beta to judge the desulfurization and dephosphorization efficiency in the current smelting process,
if Si is less than S alpha, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process is low, and increases the oxygen introduction rate;
if the S alpha is less than or equal to Si and less than S beta, the server judges the desulfurization and dephosphorization efficiency in the current smelting process, and further judges according to the appearance of the slag;
and if the S beta is not more than Si, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process is high, and does not adjust the oxygen introduction rate.
The server is used for analyzing the ratio of the surface areas of the molten steel and the slag to judge the efficiency of the redox reaction, so that the waste of oxygen is effectively avoided, and the quality of the electric furnace smelting riveting steel is further improved.
Specifically, the maximum diameter of the j-th slag shot once is Dj, wherein j =1,2,3, \ 8230, m and m are the maximum slag quantity shot once, the maximum standard diameter D0 of a single slag is arranged in the server, the server compares Dj with D0 to judge the desulfurization and dephosphorization efficiency in the current smelting process,
if Dj of any one slag in single shooting is less than or equal to D0, the server judges that the oxygen introducing rate is not adjusted in the desulfurization and dephosphorization efficiency of the electric furnace;
if Dj of any one slag in single shooting is larger than D0, the server judges that the electric furnace is low in desulfurization and dephosphorization efficiency, and controls the electric furnace to start cleaning the slag.
The impurity condition in the electric furnace is judged by analyzing the shape of the slag, so that the accuracy of judging the running condition of the electric furnace is effectively improved, and the quality of the electric furnace smelting riveting steel is further improved.
Specifically, after the electric furnace is subjected to single tapping, the detection device waits for a preset time to shoot a boundary image of slag and molten steel in the electric furnace and transmits the boundary image to the server, a third preset area S gamma is arranged in the server for the image Si shot at the ith time, the third preset area S gamma is a waste image threshold value, the server compares Si with S gamma to judge the image efficiency of the slag in the current smelting process on desulfurization and dephosphorization, and therefore the shaking of the electric furnace is determined,
if Si is less than S gamma, the server judges that the occupied surface area of the slag in the current smelting process is large, so that the low desulfurization and dephosphorization efficiency of the electric furnace is judged, and the electric furnace is controlled to shake in a preset amplitude so as to reduce the occupied surface area of the slag;
if the Si is larger than or equal to the S gamma, the server judges that the occupied surface area of the slag in the current smelting process is small, so that the desulfurization and dephosphorization efficiency of the electric furnace is judged to be reasonable, and the electric furnace is controlled to shake.
Through rocking the electric stove with the slay distribution in disturbing the electric stove, when effectively having promoted smelting reaction contact surface, promoted the efficiency of nitrogen and phosphorus removal to the spiral shell steel is riveted in the electric stove smelting quality has further been promoted.
Specifically, when the server controls the electric furnace to shake, the detection device waits for a preset time to shoot a boundary image of slag and molten steel in the electric furnace and transmits the boundary image to the server, a preset maximum shaking slag diameter threshold value D delta is set in the server for the diameter Dj of the jth slag, the server compares the Dj with the D delta to judge the hardness of the slag,
if Dj of any one piece of slag in single shooting is smaller than D delta, the server judges that the slag in the electric furnace is less accumulated and the hardness is low, and further judges according to Si;
and if Dj of any one piece of slag in single shooting is larger than or equal to Ddelta, the server judges that the slag in the electric furnace is large in accumulation and high in hardness, and controls the electric furnace to start cleaning the slag.
Through rocking the electric stove with the slay distribution in disturbing the electric stove, when effectively having promoted smelting reaction contact surface, promoted the efficiency of nitrogen and phosphorus removal to the spiral shell steel is riveted in the electric stove smelting quality has further been promoted.
Please refer to fig. 4, which is a schematic structural diagram of a periscope according to the present invention. The outside of the periscope 1 is provided with a purging pipe 11 which is connected with an oxygen pipeline, the upper end of the periscope is provided with a cleaning valve for introducing oxygen into the purging pipe 11, an observation lens 13 is cleaned through a purging hole 14, when observation is carried out, images are transmitted through the observation lens 13 and a middle lens 12 in sequence by taking molten steel and light emitted by electrodes as light sources, wherein the observation lens 13 is formed by a small-hole imaging principle so as to avoid the damage of a lens structure caused by high-temperature atmosphere, and the lens 14 is positioned on the focus of the lens 13 and used for transmitting the images to a detection module.
Specifically, when the electric furnace is tapped, the server controls the cleaning valve to be opened so as to clean the periscope arranged on the detection device and prevent dust attached to the periscope from influencing the observation result of the detection device in the electric furnace steel making process.
The electric furnace is rocked by the application of the self tapping function of the electric furnace, so that the quality of the electric furnace for smelting the riveting screw steel is further improved while the structural safety of the electric furnace is effectively ensured.
Specifically, when the server controls the electric furnace to rock, the electric furnace closes the steel-tapping hole, and controls the electric furnace to rock repeatedly for a preset number of times by taking the steel-tapping angle of the electric furnace as the maximum inclination angle.
Through the mode of regarding the biggest inclination angle of electric stove as the biggest range of rocking, when effectively having reduced electric stove repacking engineering volume, further promoted the electric stove and smelted the quality of riveting spiral shell steel.
Specifically, when the server controls the electric furnace to shake, the electrodes in the electric furnace are lifted away from the molten steel to avoid damage to the electrodes.
When the electric furnace shakes, the electrode is lifted away from the molten steel, so that the safety of the electrode is effectively guaranteed, and the quality of the electric furnace smelting riveted steel is further improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the electric furnace smelting riveting screw steel ML20 is characterized by comprising the following steps:
s1, detecting an inner boundary of slag in the electric furnace by using a detection device, and transmitting a geometric figure of the inner boundary to a server;
s2, preliminarily judging the current desulfurization and dephosphorization conditions by the server according to the geometric figure of the inner boundary of the slag, and controlling the oxygen blowing rate of the electric furnace;
s3, after the server controls the electric furnace to tap steel, the detection device detects the inner boundary of the slag in the electric furnace after preset time, and if the area of a geometric figure formed by the inner boundary of the slag is smaller than a preset area, the server judges that furnace shaking processing is needed;
s4, the server controls the electric furnace closed outlet to shake when the server judges that furnace shaking processing is needed, the diameter of slag in the electric furnace is detected through the detection device, if the diameter of the slag is larger than a preset diameter, the server judges that the electric furnace needs to be cleaned, and if the diameter of the slag is smaller than the preset diameter, the server judges that the smelting process is normal;
by means of increasing the reaction contact surface, the desulfurization and dephosphorization efficiency of the electric furnace during smelting the riveting screw steel is improved, so that the smelting quality of the riveting screw steel is improved.
2. The method for preparing the electric furnace smelting rivet-screw steel ML20 according to claim 1, wherein the server controls the detection device to observe the boundary condition of the slag in the furnace through a periscope to judge the smelting condition in the furnace when the electric furnace smelting is performed.
3. The method for preparing electric furnace smelting rivet-screw steel ML20 according to claim 2, characterized in that when smelting is carried out, the detection device shoots a boundary image of slag and molten steel in the electric furnace and transmits the image to the server, for the ith shot image, the server sets the area enclosed by the slag and the molten steel in the image as Si, wherein i =1,2,3, \8230, n, n is the maximum shooting frequency, a first preset area S alpha and a second preset area S beta are arranged in the server, wherein S alpha is greater than 0 and less than S beta, the first preset area S alpha is the minimum reaction area, the second preset area S beta is the maximum reaction area, the server compares Si with S alpha and S beta to judge the desulfurization and dephosphorization efficiency in the current smelting process,
if Si is less than S alpha, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process is lower than a preset standard, and increases the oxygen introduction rate;
if the S alpha is less than or equal to Si and less than S beta, the server preliminarily judges that the desulfurization and dephosphorization efficiency in the current smelting process meets the preset standard, and further judges the hardness of the slag according to the appearance of the slag;
and if the S beta is not more than Si, the server judges that the desulfurization and dephosphorization efficiency in the current smelting process meets the preset standard and does not adjust the oxygen introduction rate.
4. The method for preparing electric furnace smelting rivet-screw steel ML20 as claimed in claim 3 is characterized in that when the server further judges the hardness of the slag according to the appearance of the slag, the maximum diameter of the j-th slag in a single shot is Dj, wherein j =1,2,3, \8230, m, m is the maximum number of the slag in a single shot, the server is provided with the maximum standard diameter D0 of a single slag, the server compares Dj with D0 to further judge the desulfurization and dephosphorization efficiency in the current smelting process,
if the maximum diameter Dj of any one piece of slag in single shooting meets the condition that Dj is less than or equal to D0, the server judges that the desulfurization and dephosphorization efficiency of the electric furnace meets the preset standard and does not adjust the oxygen introduction rate;
and if the maximum diameter Dj of any one piece of slag in single shooting meets the condition that Dj is larger than D0, the server judges that the desulfurization and dephosphorization efficiency of the electric furnace is lower than a preset standard, and simultaneously controls the electric furnace to start cleaning the slag.
5. The method for preparing electric furnace smelting rivet-screw steel ML20 as claimed in claim 4 wherein after the electric furnace has been tapped a single time, the detection means captures an image of a boundary between slag and molten steel in the electric furnace after a delay of a preset time and transmits the image to the server, and for the image Si captured for the ith time, the server has a third preset area S γ, wherein the third preset area S γ is a waste image threshold, the server compares Si with S γ to determine the image efficiency of the slag in the current smelting process for removing sulfur and phosphorus and determines whether to carry out furnace sloshing treatment on the electric furnace according to the comparison result,
if Si is less than S gamma, the server judges that the occupied surface area of the slag in the current smelting process is higher than a preset standard, so that the desulfurization and dephosphorization efficiency of the electric furnace is judged to be lower than the preset standard, and the electric furnace is controlled to shake in a preset amplitude so as to reduce the occupied surface area of the slag;
and if the Si is larger than or equal to the S gamma, the server judges that the occupied surface area of the slag in the current smelting process is smaller than a preset standard, so that the desulfurization and dephosphorization efficiency of the electric furnace is judged to meet the preset standard, and the electric furnace is controlled to shake.
6. The method for preparing electric furnace smelting rivet-screw steel ML20 as claimed in claim 5, wherein when the server controls the electric furnace to swing, the detection device waits for a preset time to shoot a boundary image of slag and molten steel in the electric furnace and transmits the image to the server, for the diameter Dj of the jth slag, a preset maximum swing slag diameter threshold D δ is set in the server, the server compares Dj with D δ to judge the hardness of the slag,
if Dj of any one piece of slag in single shooting is smaller than D delta, the server judges that the slag accumulation in the electric furnace is smaller than a preset size and the hardness is lower than a preset standard, and simultaneously judges that the slag does not need to be cleaned;
and if Dj of any one piece of slag in single shooting is larger than or equal to Ddelta, the server judges that the slag accumulation in the electric furnace is larger than a preset size and the hardness is higher than a preset standard, and controls the electric furnace to start cleaning the slag.
7. The method for preparing ML20 through electric furnace smelting of rivet-screw steel according to claim 6, wherein when the electric furnace is tapping, the server controls the cleaning valve to be opened so as to clean the periscope arranged on the detection device, and thus dust attached to the periscope in the electric furnace steelmaking process is prevented from affecting the observation result of the detection device.
8. The method for preparing electric furnace smelted rivet-screw steel ML20 according to claim 7, wherein when the server controls the electric furnace to rock, the electric furnace closes the tap hole and controls the electric furnace to rock back and forth a preset number of times with the tap angle of the electric furnace as the maximum tilting angle.
9. The method for preparing electric smelting rivet-screw steel ML20 according to claim 8, characterized in that when the server controls the electric furnace to shake, the electrodes in the electric furnace are lifted away from the molten steel to avoid damage to the electrodes.
10. The method for preparing the electric furnace smelting rivet-screw steel ML20 according to claim 9 is characterized in that when the server judges that a single smelting enters an oxidation period, the server controls the detection device to shoot.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH09182953A (en) * | 1995-12-27 | 1997-07-15 | Tokai Carbon Co Ltd | Method for detecting slag |
| CN102921915A (en) * | 2012-10-23 | 2013-02-13 | 杭州谱诚泰迪实业有限公司 | Slag carry-over detection method and device based on image recognition of vortex on surface of molten steel |
| CN104232837B (en) * | 2014-09-24 | 2016-08-24 | 杭州谱诚泰迪实业有限公司 | A kind of converter/electric furnace steel tapping monitoring device and control method |
| JP7292627B2 (en) * | 2018-11-29 | 2023-06-19 | オーエム金属工業株式会社 | Automatic slag removal device and automatic slag removal program |
| CN110631709A (en) * | 2019-09-24 | 2019-12-31 | 湖北理工学院 | Non-contact molten steel temperature detection method during converter steelmaking and converter reversing |
| CN113005254A (en) * | 2021-02-23 | 2021-06-22 | 山东钢铁股份有限公司 | Unmanned intelligent steelmaking system and steelmaking method |
| CN114085947A (en) * | 2021-11-11 | 2022-02-25 | 福建三宝钢铁有限公司 | Preparation method of electric furnace smelting rivet-screw steel ML20 |
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