CN113333488B - Automatic slag flushing system and process for slag runner of hot rolling line - Google Patents
Automatic slag flushing system and process for slag runner of hot rolling line Download PDFInfo
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- CN113333488B CN113333488B CN202110629326.0A CN202110629326A CN113333488B CN 113333488 B CN113333488 B CN 113333488B CN 202110629326 A CN202110629326 A CN 202110629326A CN 113333488 B CN113333488 B CN 113333488B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application provides an automatic slag flushing system and an automatic slag flushing process for a slag runner of a hot rolling line, and relates to the field of hot rolling. The system comprises: the system comprises a central controller, a main cooling water pipe, a main electromagnetic valve, a sectional cooling water pipe, a sectional electromagnetic valve, a nozzle and a water level sensor; the system senses water level information in the slag runner in real time through the water level sensor, the central controller performs comprehensive judgment according to the received water level information and the hot rolling information of steel products, controls the opening and corresponding opening range of each electromagnetic valve, and sprays water through the nozzle extending into the slag runner, so that automatic and real-time slag flushing is realized, and the problem of slag runner blockage is effectively solved.
Description
Technical Field
The application relates to the field of hot rolling, in particular to an automatic slag flushing system and an automatic slag flushing process for a slag runner of a hot rolling line.
Background
The bar rolling system is divided into a phosphorus removal area, a rough rolling area, a medium rolling area, a finish rolling area and a finished product rack, in the production process of a bar line, rolled pieces can generate iron scales through high-temperature heating, and in the rolling process, the iron scales are different in thickness due to different steel types and different heating periods, wherein the phosphorus removal area and the rough rolling area have more iron scales, and the medium rolling area and the finish rolling area have fewer iron scales. The normally generated iron scale can flow into a slag runner of the rolling mill through cooling water of the roller and then is flushed into a rotational flow tank; however, when some steel grades are rolled, the iron scale is more due to the material performance of the steel, the rolling process and the like, the iron scale in the slag runner cannot be washed away by the cooling water of the roller alone, and the iron scale is accumulated after a long time, so that the slag runner is blocked. Because the rolling mill slag runner belongs to a limited space, the short-time production stoppage maintenance cannot carry out slag runner cleaning operation, and the long-time production stoppage is needed for cleaning, thereby seriously influencing the production of enterprises; moreover, scale can build up over time, which adds to the difficulty of cleaning.
In the prior art, CN207746217U discloses a hot-rolling slag flushing ditch structure, wherein the finish rolling slag flushing ditch and the heating slag flushing ditch are designed into a height difference structure, so that turbid circulating water with large water volume and high iron scale content in the finish rolling slag flushing ditch with low water level is positioned below turbid circulating water with small water volume and high iron scale content in the heating slag flushing ditch, and can be fully stirred and flushed at a junction, so that the iron scale continuously moves forward along with water flow and finally enters a cyclone well, thereby solving the problem of deposition of the iron scale at the junction. However, the design of the slag runner is only dependent on, the problem of slag runner blockage caused by a large amount of iron scale generated by certain steel types in certain sections cannot be solved, and the blockage position cannot be judged in real time, so that automatic and real-time slag flushing is difficult to realize, and the iron scale is scaled together after a long time, so that the difficulty is increased for subsequent cleaning.
Therefore, the technical problem to be solved by the technical personnel in the field is how to accurately judge the blockage position, realize automatic and real-time slag flushing and effectively solve the blockage of the slag runner.
Disclosure of Invention
Based on the technical problem, the application aims to provide the automatic slag flushing system and the automatic slag flushing process for the slag runner of the hot rolling line, the blocking position can be effectively judged through the system and the process, automatic and real-time slag flushing is realized, and the problem of slag runner blocking is effectively solved.
In a first aspect, the present application provides an automatic slag flushing system for a slag runner of a hot rolling line, which is characterized by comprising: the system comprises a central controller, a main cooling water pipe, a main electromagnetic valve, a sectional cooling water pipe, a sectional electromagnetic valve, a nozzle and a water level sensor;
wherein, the slag runner arranges along rolling line direction, includes: a dephosphorization section slag channel, a rough rolling section slag channel, a finish rolling section slag channel and a cyclone tank section slag channel; a water level sensor is arranged on the side wall of the slag runner and used for sensing the water level condition in the slag runner;
the main cooling water pipe is used for supplying water to the subsection cooling water pipes, and the main solenoid valve is used for controlling the opening of the main cooling water pipe;
the sectional cooling water pipe is provided with a sectional electromagnetic valve and a nozzle, wherein the nozzle extends into the slag runner, and the direction of the nozzle faces to the flowing direction of the slag flushing water so as to be used for flushing slag;
and the central controller controls the opening of the main electromagnetic valve and the subsection electromagnetic valve according to the hot rolling information and the water level condition in the slag runner, so that automatic slag flushing is realized.
The system senses water level information in the slag runner in real time through the water level sensor, the central controller performs comprehensive judgment according to the received water level information and combined with hot rolling information and the like of steel, the opening and corresponding opening amplitude of each electromagnetic valve are controlled, and water is sprayed through the nozzles extending into the slag runner, so that automatic and real-time slag flushing is realized, and the problem of blockage of the slag runner is effectively solved.
In one possible implementation mode, water level sensors are respectively arranged on the side walls of the slag runner of the dephosphorization section, the rough rolling section and the cyclone tank section; correspondingly, the slag chutes of the dephosphorization section, the rough rolling section and the cyclone tank section are also respectively provided with the nozzles extending into the slag chutes. In each hot rolling section, compared with a middle rolling section and a finish rolling section, the iron scale generated in a dephosphorization section and a rough rolling section is the most, so that a slag runner is easily blocked; in addition, the cyclone tank section is a confluence part of each section and is easy to block, so that a water level sensor and a nozzle are respectively arranged on the dephosphorization section, the rough rolling section and the slag runner of the cyclone tank section.
In a possible realization mode, the slag chutes of the middle rolling section and the finish rolling section are also provided with water level sensors and nozzles for flushing slag when the slag chutes of the middle rolling section and the finish rolling section are blocked.
In a possible implementation manner, a main pipe manual valve is further arranged on the main cooling water pipe, and a sectional manual valve is arranged on the sectional cooling water pipe.
In one possible implementation, the slag runner includes a sidewall and a bottom, wherein the bottom is semi-circular; the depth of the slag runner is gradually increased from the dephosphorization section to the cyclone tank section, and the slag runner has an inclination of 5-8 degrees. Specifically, the slope may be 5 °, 5.5 °, 6 °, 6.5 °, 7 °, 7.5 °, 8 °, or the like; through the design of the bottom and the depth of the slag runner, the slag can be flushed by water flow conveniently, and the resistance during slag flushing is reduced.
In one possible realization mode, the water level sensor is arranged at the position 2/5-4/5 of the height from the bottom of the slag runner. Specifically, the position can be 2/5, 3/5 or 4/5, etc.; during normal operation, water flow in the slag runner is generally located at 1/3 of the depth of the slag runner, and the water level sensor is arranged at the 1/3 of the depth of the slag runner, so that the smooth condition of the water flow in the slag runner can be effectively sensed, and whether slag flushing operation is needed or not can be fed back to the central controller.
In one possible implementation, the nozzle is a long stainless steel tube, the length of which is 15-30 cm. Specifically, the length of the tube is 15cm, 20cm, 25cm or 30cm and the like; when the slag flushing is started, the long stainless steel pipe nozzle can generate vibration due to the ejection of high-pressure water, the vibration is larger along with the increase of water pressure, and the generated vibration can loosen the iron oxide scales blocked at the periphery of the water pipe, so that the slag flushing is facilitated.
In one possible implementation, the hot rolling information includes steel material property information and tapping cycle information. Specifically, the steel material property information includes yield strength, material quality, and the like.
In a second aspect, the application provides an automatic slag flushing process for a slag runner of a hot rolling line, which applies the automatic slag flushing system, and the process comprises the following steps:
s1, opening a main pipe manual valve and a sectional manual valve;
s2, receiving hot rolling information by a central controller, and determining the opening amplitude of a main pipe electromagnetic valve according to the hot rolling information, wherein the hot rolling information comprises steel material performance information and steel tapping period information;
s3, feeding back water level information by the water level reactor, judging the slag runner section where the blockage is located by the central controller according to the water level information, determining a segmented electromagnetic valve to be opened, and starting slag flushing;
s4, after the slag is flushed for a certain time, the central controller judges the slag flushing condition according to the latest water level information fed back by the water level reactor;
when the water level sensor does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve, closing each subsection electromagnetic valve, and completing slag flushing circulation;
when the water level sensor feeds back the water level to continue rising, the slag flushing is judged to be not smooth, the opening range of the main pipe electromagnetic valve is increased, the plurality of segmented electromagnetic valves are opened until the slag flushing is smooth, and the slag flushing circulation is completed.
In a possible implementation manner, in the step S2, the opening amplitude of the main pipe electromagnetic valve is determined according to the steel material performance information and the steel tapping period information,
when the yield strength of the steel is lower than 515MPa and the tapping period is 40-60 s, the main pipe electromagnetic valve is opened for 15-20%;
when the yield strength of the steel is higher than 515MPa and the tapping period is 60-120 s, the main pipe electromagnetic valve is opened by 20-30%;
when the tapping period is more than 120s, the main pipe electromagnetic valve is opened by 30-40%.
In a possible implementation manner, the steel material with the yield strength lower than 515MPa is any one of HRB400 and HRB 400E; the steel with the yield strength higher than 515MPa is any one of BS460, HRB600, HRB500E, nuclear power steel, mild steel and alloy steel.
When steel grades with different strengths are rolled, the required heating process temperature and the tapping period are different, and the thicknesses of the generated iron scales are different; when common steel with yield strength lower than 515MPa, such as HRB400 and HRB400E, is rolled, forced heating can be performed, the rolling line speed is increased, the tapping period is 40-60 s, the heating time of a steel billet in a furnace is short, the tapping process temperature is 1050-1100 ℃, the scale of the produced steel billet is thin, the possibility of slag runner blockage is low, and even if the blockage occurs, the steel billet is easy to dredge, so that the main pipe electromagnetic valve is opened by 15-20% at the moment; specifically, the opening range may be 15%, 16%, 17%, 18%, 19%, 20%, or the like. When rolling steel with yield strength higher than 515MPa, such as BS460, HRB600, HRB500E, nuclear power steel, high-quality carbon steel, alloy steel and the like, forced heating cannot be performed, the temperature difference between the inside and the outside of a steel billet must be reduced, accidents such as steel billet fracture and the like caused by thermal stress are prevented, the rolling line speed is slow, the steel tapping period is 60S-120S, the heating time of the steel billet in a heating furnace is long, the scale generated at the time is thick, and slag runner blockage is easily caused, so that the main pipe electromagnetic valve is opened by 20% -30%, specifically, the opening amplitude is 20%, 22%, 25%, 27% or 30%. However, when the tapping period is higher than 120s, the heating time of the billet in the heating furnace is too long, and at this time, no matter what kind of billet is, a large amount of scale is generated, and the slag runner is easily blocked, so that the opening range of the main pipe electromagnetic valve needs to be increased, for example, 30 to 40%, specifically, 30%, 32%, 35%, 37%, 40%, and the like.
Compared with the prior art, the invention has the following beneficial effects:
the application provides an automatic slag flushing system, through the water level condition in the water level inductor response slag runner, central controller combines the hot rolling information of steel etc. to carry out comprehensive judgement according to received water level information, controls each solenoid valve from this and opens and corresponding opening range, sprays water through the nozzle that stretches into in the slag runner, realizes from this that automatic, real-time towards the sediment, effectively solves the slag runner and blocks up the problem.
The utility model provides an automatic towards sediment system, nozzle have adopted long nonrust steel pipe, and the vibrations that the high pressure water spray produced can effectively improve towards the sediment effect.
According to the automatic slag flushing process, the central controller determines the opening amplitude of the main pipe electromagnetic valve according to the yield strength of steel, the steel tapping period and other information, different slag flushing strategies are executed according to different amounts and thicknesses of iron oxide blank slag generated by different steel and heating periods, and water consumption and power consumption cost can be effectively saved while the slag flushing effect is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic structural view of an automatic slag flushing system of a slag runner of a hot rolling line according to the present invention;
FIG. 2 is a schematic structural view of the bottom of the slag runner of the present invention
FIG. 3 is a schematic view of a side wall of the slag runner according to the present invention.
The following are shown in the figure: 1-total cooling water pipe, 2-main manual valve, 3-main electromagnetic valve, 401-first section cooling water pipe, 402-second section cooling water pipe, 403-third section cooling water pipe, 404-fourth section cooling water pipe, 501-first section manual valve, 502-second section manual valve, 503-third section manual valve, 504-fourth section manual valve, 601-first section electromagnetic valve, 602-second section electromagnetic valve, 603-third section electromagnetic valve, 604-fourth section electromagnetic valve, 7-slag runner, 801-first nozzle, 802-second nozzle, 803-third nozzle, 804-fourth nozzle, 901-first water level sensor, 902-second water level sensor, 903-third water level sensor, 904-fourth cyclone water level sensor and 10-cyclone water tank.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Fig. 1 shows an automatic slag flushing system for a slag runner of a hot rolling line, which comprises: a central controller (not shown in the figure), a main cooling water pipe 1, a main electromagnetic valve 3, a sectional cooling water pipe, a sectional electromagnetic valve, a nozzle and a water level sensor;
wherein, the slag runner 7 is arranged along the rolling line direction, and comprises: a dephosphorization section slag runner, a rough rolling section slag runner, a middle rolling section slag runner, a finish rolling section slag runner and a cyclone tank section slag runner (the section where the slag runner is located, is not marked in the figure); four water level sensors are arranged on the side wall along the slag runner 7, and the water level sensors are arranged at the positions 2/5-4/5 of the height from the bottom of the slag runner; wherein, a first water level sensor 901 is arranged at the cyclone tank section, a second water level sensor 902 is arranged at the finish rolling section, a third water level sensor 903 is arranged at the rough rolling section, and a fourth water level sensor 904 is arranged at the dephosphorization section. In each hot rolling section, compared with a medium rolling section and a finish rolling section, the scale generated in a dephosphorization section and a rough rolling section is the most, so that slag chutes are easy to block; in addition, the cyclone pool section is a confluence section of each section, and is easy to block; therefore, in one embodiment, water level sensors may be provided only at the slag chutes of the dephosphorization stage, the roughing stage and the cyclone tank stage.
The main cooling water pipe 1 is used for supplying water to the subsection cooling water pipes, and the main solenoid valve 3 is used for controlling the opening of the main cooling water pipe 1; in one embodiment, a main manual valve 2 is further arranged on the main cooling water pipe 1 upstream of the main electromagnetic valve 3.
The sectional cooling water pipe is provided with a sectional electromagnetic valve and a nozzle, wherein the nozzle extends into the slag runner, and the direction of the nozzle faces to the flowing direction of the slag flushing water so as to be used for flushing slag. The slag flushing system shown in fig. 1 is provided with 4 segmented cooling water pipes, and according to the slag channel section where the water level sensor is located, a first segmented cooling water pipe 401 is arranged on the cyclone pool section, and is provided with a first segmented manual valve 501, a first segmented electromagnetic valve 601 and a first nozzle 801; the second sectional cooling water pipe 402 is arranged at the finish rolling section, and a second sectional manual valve 502, a second sectional electromagnetic valve 602 and a second nozzle 802 are arranged on the second sectional cooling water pipe; the third sectional cooling water pipe 403 is arranged at the rough rolling section, and a third sectional manual valve 503, a third sectional electromagnetic valve 603 and a third nozzle 803 are arranged on the third sectional cooling water pipe; the fourth subsection cooling water pipe 404 is arranged at the phosphorus removal section, and a fourth subsection manual valve 504, a fourth subsection electromagnetic valve 604 and a fourth nozzle 804 are arranged on the fourth subsection cooling water pipe. In one embodiment, sectional cooling water pipes, nozzles and the like can be arranged at the slag chutes of the dephosphorization section, the rough rolling section and the cyclone tank section.
In one embodiment, the nozzle is a long stainless steel tube having a length of 15 to 30cm.
In the specific slag flushing operation process, the central controller can control the opening of the main electromagnetic valve and the subsection electromagnetic valve according to the hot rolling information and the water level condition in the slag runner, so that automatic slag flushing is realized.
In one possible implementation, the hot rolling information includes steel material property information and tapping cycle information.
In one embodiment, the slag runner includes sidewalls and a bottom, wherein the bottom is semi-circular, as can be seen in particular in fig. 2; the slag runner gradually increases in depth from the dephosphorization section to the cyclone tank section, and has an inclination of 5-8 degrees, so that the slag runner is convenient for water flow to flush slag, and the resistance during flushing slag is reduced.
Fig. 3 also shows an embodiment of the slag runner sidewall having an inverted "splayed" shape.
The embodiment also provides an automatic slag flushing process for the slag runner of the hot rolling line, which applies the automatic slag flushing system provided by the embodiment, wherein the water pressure of the water main is 0.4-0.6 MPa, and the following steps are specifically adopted in the normal production operation process:
s1, opening a main pipe manual valve 2 and each section manual valve;
s2, the central controller receives hot rolling information, and determines the opening amplitude of the main pipe electromagnetic valve according to the hot rolling information, wherein the hot rolling information comprises steel material performance information and steel tapping period information;
when the yield strength of the steel is lower than 515MPa, such as common steel HRB400, HRB400E and the like, and the tapping period is 40-60 s, the main solenoid valve 3 is opened for 15-20%;
when the yield strength of the steel is higher than 515MPa, such as BS460, HRB600, HRB500E, nuclear power steel, high carbon steel, alloy steel and other steel types, and the tapping period is 60-120 s, the main solenoid valve is opened by 20-30%;
when the tapping period is more than 120s, the main pipe electromagnetic valve is opened by 30-40%;
s3, feeding back water level information by the water level reactor, judging the slag runner section where the blockage is located by the central controller according to the water level information, determining a segmented electromagnetic valve to be opened, and starting slag flushing;
s4, after the slag is flushed for a certain time, the central controller judges the slag flushing condition according to the latest water level information fed back by the water level reactor;
when the water level sensor does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve, and closing each sectional electromagnetic valve to finish the slag flushing circulation;
when the water level sensor feeds back the water level to continue rising, the slag flushing is judged to be not smooth, the opening range of the main pipe electromagnetic valve is increased, the plurality of segmented electromagnetic valves are opened until the slag flushing is smooth, and the slag flushing circulation is completed.
The specific embodiment of the slag flushing process is as follows.
Example 1
The hot rolled steel is common steel HRB400E, the tapping period is 40-60 s, and the water pressure of a total cooling water pipe is 0.5MPa.
S1, opening a main pipe manual valve 2 and each segmented manual valve;
s2, the central controller determines that the main pipe electromagnetic valve is opened by 15% according to the hot rolling information;
s3, if slag blocking occurs in the cyclone tank section, the water level rises, the first water level sensor 901 is electrified, the first sectional electromagnetic valve 601 is opened, the first nozzle 801 carries out high-pressure slag flushing, steel pipes vibrate due to the fact that high-pressure water is sprayed out in the slag flushing process, the generated vibration can loosen iron scales blocked at the periphery of the water pipe, and the iron scales are prevented from being accumulated as the high-pressure water is flushed into the cyclone tank;
s4, when the water level is lowered and the first water level sensor 901 does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve 3 and closing the first sectional electromagnetic valve 901 to finish the slag flushing circulation;
when the water level continues to rise, the second water level sensor 902 is powered on, the central controller judges that slag flushing is not smooth, the opening range of the main pipe electromagnetic valve 3 is increased to 40%, the second sectional electromagnetic valve 602 is opened, and the first nozzle 801 and the second nozzle 802 flush slag simultaneously. And so on until the slag flushing is smooth, the slag runner is ensured to be smooth.
Example 2
The hot rolled steel is HRB600, the tapping period is 60-120 s, and the water pressure of the total cooling water pipe is 0.5MPa.
S1, opening a main pipe manual valve 2 and each section manual valve;
s2, the central controller determines 25% of the total pipe electromagnetic valve to be opened according to the hot rolling information;
s3, if slag blockage occurs in the cyclone tank section, the water level rises, the first water level sensor 901 is electrified, the first sectional electromagnetic valve 601 is opened, and the first nozzle 801 carries out high-pressure slag flushing.
S4, when the water level is lowered and the first water level sensor 901 does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve 3 and closing the first sectional electromagnetic valve 601 to finish the slag flushing circulation;
when the water level rises rapidly, the second water level sensor 902 is powered on, the central controller judges that slag flushing is not smooth, the opening range of the main pipe electromagnetic valve 3 is increased to reach 50%, the second sectional electromagnetic valve 602 and the third sectional electromagnetic valve 603 are opened simultaneously, and the first nozzle 801, the second nozzle 802 and the third nozzle 803 flush slag simultaneously. And so on until the slag is washed smoothly, ensuring the slag runner to be smooth.
Example 3
The hot rolled steel is common steel HRB400E, the steel tapping period is more than 60min due to the shutdown maintenance of the changed variety specification, and the water pressure of a total cooling water pipe is 0.5MPa.
S1, opening a main pipe manual valve 2 and each section manual valve;
s2, because of shutdown maintenance, the heat preservation time of the billet in the heating furnace is too long, so that the oxide scale is very thick, and the central controller determines that the main pipe electromagnetic valve is opened by 40 percent according to the information;
s3, if slag blockage occurs in the cyclone tank section, the water level rises, the first water level sensor 901 is electrified, at the moment, the first sectional electromagnetic valve 601 and the second sectional electromagnetic valve 602 are opened simultaneously, and the first nozzle 801 and the second nozzle 802 perform high-pressure slag flushing simultaneously;
s4, when the water level is lowered and the first water level sensor 901 does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve 3, and closing the first sectional electromagnetic valve 601 and the second sectional electromagnetic valve 602 to finish the slag flushing circulation;
when the water level rises rapidly, the third water level sensor 903 is powered on, the central controller judges that slag flushing is not smooth, the opening amplitude of the main pipe electromagnetic valve 3 is increased to 60%, the third section electromagnetic valve 603 and the fourth section electromagnetic valve 604 are opened, and at the moment, the first nozzle 801, the second nozzle 802, the third nozzle 803 and the fourth nozzle 804 are simultaneously flushed with slag; until the slag is flushed smoothly, the slag channel is ensured to be smooth.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. The automatic slag flushing process for the slag runner of the hot rolling line is characterized in that an automatic slag flushing system is applied, and the automatic slag flushing system comprises: the system comprises a central controller, a main cooling water pipe, a main electromagnetic valve, a sectional cooling water pipe, a sectional electromagnetic valve, a nozzle and a water level sensor;
wherein, the slag runner arranges along rolling line direction, includes: a dephosphorization section slag channel, a rough rolling section slag channel, a finish rolling section slag channel and a cyclone tank section slag channel; a water level sensor is arranged on the side wall of the slag runner and used for sensing the water level condition in the slag runner;
the main cooling water pipe is used for supplying water to the sectional cooling water pipes, and the main electromagnetic valve is used for controlling the opening of the main cooling water pipe;
the sectional cooling water pipe is provided with a sectional electromagnetic valve and a nozzle, wherein the nozzle extends into the slag runner, and the direction of the nozzle faces to the flowing direction of the slag flushing water so as to be used for flushing slag;
the central controller controls the opening of the main electromagnetic valve and the subsection electromagnetic valve according to the hot rolling information and the water level condition in the slag runner, so that automatic slag flushing is realized;
the automatic slag flushing process comprises the following steps:
s1, opening a main pipe manual valve and a sectional manual valve;
s2, receiving hot rolling information by a central controller, and determining the opening amplitude of a main pipe electromagnetic valve according to the hot rolling information, wherein the hot rolling information comprises steel material performance information and steel tapping period information;
s3, feeding back water level information by the water level reactor, judging the blocked slag runner section by the central controller according to the water level information, determining a segmented electromagnetic valve to be opened, and starting slag flushing;
s4, after the slag is flushed for a certain time, the central controller judges the slag flushing condition according to the latest water level information fed back by the water level reactor;
when the water level sensor does not sense the water level, judging that the slag flushing is smooth, closing the main pipe electromagnetic valve, closing each subsection electromagnetic valve, and completing slag flushing circulation;
when the water level sensor feeds back the water level to continue rising, the slag flushing is judged to be not smooth, the opening range of the main pipe electromagnetic valve is increased, the plurality of segmented electromagnetic valves are opened until the slag flushing is smooth, and the slag flushing circulation is completed.
2. The automatic slag flushing process according to claim 1, wherein in the step S2, the opening amplitude of the main pipe electromagnetic valve is determined according to the steel material performance information and the steel tapping period information,
when the yield strength of the steel is lower than 515MPa and the tapping period is 40-60 s, the main pipe electromagnetic valve is opened for 15-20%;
when the yield strength of the steel is higher than 515MPa and the tapping period is 60-120 s, the main pipe electromagnetic valve is opened by 20-30%;
when the tapping period is more than 120s, the main pipe electromagnetic valve is opened by 30-40%.
3. The automatic slag flushing process of claim 2, wherein the steel material with the yield strength lower than 515MPa is HRB400 or HRB 400E; the steel with the yield strength higher than 515MPa is any one of BS460, HRB600, HRB500E, nuclear power steel, high-carbon steel and alloy steel.
4. The automatic slag flushing process of claim 1, wherein water level sensors are respectively arranged on the side walls of the dephosphorization stage slag runner, the rough rolling stage slag runner and the cyclone tank stage slag runner; correspondingly, the dephosphorization zone slag runner, the rough rolling zone slag runner and the cyclone tank zone slag runner are respectively provided with the nozzles extending into the slag runners.
5. The automatic slag flushing process of claim 1, wherein a main pipe manual valve is further arranged on the main cooling water pipe, and a sectional manual valve is arranged on the sectional cooling water pipe.
6. The automatic slag flushing process of claim 1, wherein the slag runner includes a sidewall and a bottom, wherein the bottom is semi-circular; the depth of the slag runner is gradually increased from the dephosphorization section to the cyclone tank section, and the slag runner has an inclination of 5-8 degrees.
7. The automatic slag flushing process of claim 6, wherein the water level sensor is arranged at a position 2/5-4/5 of the height of the bottom of the slag runner.
8. The automatic slag flushing process according to claim 1, wherein the nozzle is a long stainless steel pipe, and the length of the pipe is 15-30 cm.
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