CN110093495B - Control method for inhibiting buckling of strip steel in heating section - Google Patents
Control method for inhibiting buckling of strip steel in heating section Download PDFInfo
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- CN110093495B CN110093495B CN201910499613.7A CN201910499613A CN110093495B CN 110093495 B CN110093495 B CN 110093495B CN 201910499613 A CN201910499613 A CN 201910499613A CN 110093495 B CN110093495 B CN 110093495B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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Abstract
The invention provides a control method for inhibiting buckling of strip steel in a heating section, which comprises the following steps: acquiring furnace condition information of the annealing furnace, and acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller when the furnace condition information is the normal production furnace condition; judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, if the buckling type of the strip steel is hot buckling, reducing the running speed of the strip steel in the furnace area, and if the buckling type of the strip steel is cold buckling, improving the running speed of the strip steel in the furnace area; and when the furnace condition is the start-up furnace condition, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel. The technical problem that the buckling of the strip steel is aggravated due to the fact that a control method is inaccurate in the prior art is solved. The method achieves the technical effects that a targeted control strategy is carried out on the buckling of the band steel in the heating section according to the specific conditions of the furnace condition, the control strategy is more accurate, and the band breakage accident in the furnace caused by the continuous buckling of the buckled band steel in the furnace is inhibited.
Description
Technical Field
The invention relates to the technical field of annealing furnace control, in particular to a control method for inhibiting buckling of strip steel in a heating section.
Background
The cold rolling vertical annealing furnace is mainly divided into two large areas of a hot area and a cold area, wherein the hot area mainly comprises a preheating section, a heating section and a soaking section; the cold zone mainly comprises a slow cooling section, a fast cooling section, an overaging section, a final cooling section and a water quenching section, and when the steel strip in the furnace is buckled during production, not only can serious quality defects of the steel strip be caused, but also stable production of the continuous annealing production line is influenced (the belt breakage accident in the furnace caused by buckling needs at least 24 hours from treatment accident to production recovery). The main reason of buckling of the strip steel is compressed in the width direction caused by uneven tension distribution; thermal stress due to uneven temperature distribution; friction, extrusion of rotating furnace rollers, etc. Once the buckling of the strip steel occurs in the furnace, if effective measures cannot be taken timely, the non-planned furnace cover opening is caused with a high probability. According to the buckling region, the traditional definition of buckling in a strip steel furnace is that the buckling in a hot zone is hot buckling (buckling of a strip steel in a heating section and a soaking section), and the buckling in a cold zone is cold buckling (buckling of the strip steel in an overaging section and a final cooling section). The measures taken for different kinds of buckling are also different.
However, the applicant of the present invention finds that the prior art has at least the following technical problems:
in the prior art, buckling types and control methods are established according to buckling areas, and the technical problem of aggravation of band steel buckling caused by inaccurate control methods exists.
Disclosure of Invention
The embodiment of the invention provides a control method for inhibiting buckling of strip steel at a heating section, and solves the technical problem that buckling of the strip steel is aggravated due to inaccurate control method when buckling types and control methods are established according to a buckling region in the prior art.
In view of the above problems, the present invention provides a control method for suppressing buckling of a strip in a heating section of an annealing furnace, when buckling of the strip occurs in the heating section of the annealing furnace, the method comprising: obtaining furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting; when the furnace condition information is the normal production furnace condition, acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller; judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling; if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased; and when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel.
Preferably, the judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller comprises: when the temperature of the strip steel is higher than that of the furnace roller, the buckling type of the strip steel is cold buckling; and when the temperature of the strip steel is lower than that of the furnace roller, the buckling type of the strip steel is thermal buckling.
Preferably, the normal production furnace conditions include: a heating state furnace condition, a cooling state furnace condition and a constant temperature state furnace condition.
Preferably, when the furnace condition of the annealing furnace is the cooling state, if the buckling type of the strip steel is the hot buckling, the reduction amplitude for reducing the running speed of the strip steel in the furnace area is controlled to be 5-20 m/min.
Preferably, when the furnace condition of the annealing furnace is the temperature-rising state, if the buckling type of the strip steel is the cold buckling, the increase of the running speed of the strip steel in the furnace area is controlled to be 5-20 m/min.
Preferably, when the furnace condition of the annealing furnace is the constant-temperature state furnace condition, the annealing furnace is stopped if the buckling type of the strip steel is unknown.
Preferably, the start-up furnace condition includes: starting the vehicle immediately after stopping the vehicle, and starting the vehicle again after stopping the vehicle and reducing the temperature.
Preferably, when the furnace condition of the annealing furnace is the shutdown immediate start-up, and when the furnace condition information is the start-up furnace condition, controlling to increase the running speed of the strip steel in the furnace area to the strip steel minimum running speed comprises: and controlling the running speed of the strip steel in the furnace area to be quickly increased to the lowest running speed of the strip steel from 0m/min within preset time.
Preferably, when the furnace condition of the annealing furnace is the shutdown and temperature reduction, and then the annealing furnace is started again, when the furnace condition information is the furnace condition during the start of the annealing furnace, the operation speed of the strip steel in the furnace area is controlled to be increased to the lowest operation speed of the strip steel, and the method comprises the following steps: and controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages.
Preferably, the step of controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages comprises the following steps: obtaining the thickness of the strip steel; when the thickness T of the strip steel is less than or equal to T0In the first stage, the running speed of the strip steel is controlled to reach the crawling speed v of the strip steel in the furnace areasCrawling t01Duration of time, wherein T0＝[(Tmax-Tmin)/10+Tmin]，t01＝max(lHotsection/vsB) of the group A and B); the second stage controls the strip to (v)s+vr) Speed/2 crawling t02Duration of time, wherein t02＝max(t01,/2,); the third stage controls the strip steel to vrSpeed crawling t03Duration of time, wherein t03Is as follows; when the thickness of the strip steel is Tk-1＜T≤TkAnd the k is the thickness grade of the strip steel and is divided into sections, the k is a positive integer of 3-5, and the operation speed of the strip steel is controlled by the crawling speed v of the strip steel in the furnace section in the first stagesCrawling tk1Duration of time, where tk1＝max((t01-k >); the second stage controls the strip to (v)s+vr) Speed/2 crawling tk2Duration of time, where tk2＝max(tk1,/2,); the third stage controls the strip steel to vrSpeed crawling tk3Duration of time, wherein tk3Is ≡ wherein T0Based on the thickness, T, of the stripminDesigning a minimum thickness, T, for the stripmaxDesigning the maximum thickness, T, for the stripkIs the upper limit of the thickness interval of the kth group of strip steel, vsFor the furnace zone strip steel creep speed, /)HotsectionIs the length of the hot zone strip, vrAt the lowest operating speed, t01Is the thickness T of the strip steel0Corresponding to the first stage of the strip steel creep time t02Is the thickness T of the strip steel0Corresponding to the crawling time t of the second stage strip steel03Is the thickness T of the strip steel0Corresponding to the third stage of the creep time t of the strip steelk1Is the thickness T of the strip steelkCorresponding to the first stage of the strip steel creep time tk2Is the thickness T of the strip steelkCorresponding to the crawling time t of the second stage strip steelk3Is the thickness T of the strip steelkAnd corresponding to the third-stage band steel crawling time, the shortest hot roller time is 3-10 min.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
the embodiment of the invention provides a control method for inhibiting buckling of strip steel in a heating section, which is applied to an annealing furnace, and when buckling of the strip steel occurs in the heating section of the annealing furnace, the method comprises the following steps: obtaining furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting; when the furnace condition information is the normal production furnace condition, acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller; judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling, the buckling type is judged according to the actual conditions of the temperature of the strip steel and the temperature of the furnace roller under a specific furnace condition, the judgment result is more accurate, the effect of reasonably defining the buckling type according to the change of the furnace condition is realized, in the normal production furnace condition, if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased; and when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel. The method has the advantages that a targeted control strategy is carried out on buckling of the band steel in the heating section according to the specific conditions of the furnace conditions, the control strategy is more accurate, the band breakage accident in the furnace caused by continuous buckling of the buckled band steel in the furnace is effectively inhibited, the stable production of the production line of the annealing furnace is ensured, and the technical effects that the buckling type and the control method are established according to the buckling area in the prior art, and the technical problem that the band steel buckling is aggravated due to inaccurate control method is solved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of a control method for suppressing buckling of a strip steel in a heating section according to an embodiment of the present invention;
FIG. 2 is a control flow diagram of a control method for suppressing buckling of strip steel in a heating section in an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a control method for inhibiting buckling of strip steel at a heating section, which is used for solving the technical problem that buckling of the strip steel is aggravated due to inaccurate control method when buckling types and control methods are established according to a buckling area in the prior art.
The technical scheme provided by the invention has the following general idea:
obtaining furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting; when the furnace condition information is the normal production furnace condition, acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller; judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling; if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased; and when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel. The targeted control strategy for buckling of the band steel in the heating section according to the specific conditions of the furnace condition is achieved, the control strategy is more accurate, the band breakage accident in the furnace caused by continuous buckling of the buckled band steel in the furnace is effectively inhibited, and the technical effect of stable production of the annealing furnace production line is ensured.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
FIG. 1 is a schematic flow chart of a control method for suppressing buckling of a strip steel in a heating section in an embodiment of the present invention. The embodiment of the invention provides a control method for inhibiting buckling of strip steel in a heating section, which is applied to an annealing furnace, and when buckling of the strip steel occurs in the heating section of the annealing furnace, please refer to fig. 1, the method comprises the following steps:
step 10: and acquiring furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting.
Specifically, if buckling occurs in the annealing furnace in the production process, in order to avoid serious band breakage accidents caused by buckling, a control strategy is formulated according to the specific situation of band steel buckling, the reason for buckling of the band steel is firstly determined, specific analysis is performed according to the buckling reason to make the control strategy, and the main reason for buckling of the band steel is as follows: the buckling of the strip steel caused by the reasons is relieved by adjusting the running speed of the strip steel in a hot area in the furnace, and the influence of unplanned furnace opening cover on normal production caused by the aggravation of buckling is avoided. When buckling occurs in the annealing furnace, the current furnace condition of the annealing furnace is determined firstly, a specific control strategy is analyzed according to different furnace conditions, and the buckling type analysis is inaccurate due to the change of the furnace conditions in the actual production, so that the buckling strategy is influenced.
Step 20: and when the furnace condition information is the normal production furnace condition, acquiring the strip steel temperature and the furnace roller temperature in the annealing furnace.
Step 30: and judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling.
Further, according to the strip steel temperature and the furnace roller temperature, the type of buckling of the strip steel is judged, and the method comprises the following steps: when the temperature of the strip steel is higher than that of the furnace roller, the buckling type of the strip steel is cold buckling; and when the temperature of the strip steel is lower than that of the furnace roller, the buckling type of the strip steel is thermal buckling.
Specifically, when the buckling phenomenon occurs, when the annealing furnace is in a normal production furnace condition, different control strategies are specifically selected according to the buckling type of the strip steel, the method of the embodiment of the invention defines the buckling type according to the temperature difference between the temperature of the strip steel and the temperature of the furnace roller, and is different from the prior art that the type division is performed according to the buckling region, if the temperature of the strip steel is higher than the temperature of the furnace roller, the buckling is performed as cold buckling, if the temperature of the strip steel is lower than the temperature of the furnace roller, the buckling is performed, the type division is performed according to the temperature of the strip steel and the temperature of the furnace roller, the buckling type of the strip steel is reflected more accurately, and strategy errors and the buckling of the strip steel are prevented from being aggravated due to inaccurate buckling types. The buckling definition of hot buckling and cold buckling is reasonably carried out according to the change of the furnace condition, and the type of the buckling of the strip steel is more accurately reflected.
Step 40: if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased.
Further, the normal production furnace conditions include: a heating state furnace condition, a cooling state furnace condition and a constant temperature state furnace condition.
Further, when the furnace condition of the annealing furnace is the cooling state, if the buckling type of the strip steel is the hot buckling, the reduction amplitude for reducing the running speed of the strip steel in the furnace area is controlled to be 5-20 m/min.
Further, when the furnace condition of the annealing furnace is the temperature-rising state, if the buckling type of the strip steel is the cold buckling, the amplitude of increasing the running speed of the strip steel in the furnace area is controlled to be 5-20 m/min.
Further, when the furnace condition of the annealing furnace is the constant-temperature state, the annealing furnace is stopped if the buckling type of the strip steel is unknown.
Specifically, under the normal production furnace condition, different control strategies are selected for different buckling types, the normal production furnace condition is divided into a cooling state, a heating state and a constant temperature state, as shown in fig. 2, under the cooling state, namely when DT/DT is less than 0, DT is the temperature variation of the strip steel, DT is the time variation, and the temperature variation of the strip steel along with time variation is less than zero, it is indicated that the temperature variation of the strip steel under the cooling state is gradually reduced along with time, the temperature of the strip steel is lower than the furnace roller temperature, the buckling type of the strip steel is thermal buckling, and in order to inhibit buckling, the hot roller is fully performed by reducing the running speed of the strip steel in a furnace zone, so that the temperature difference between the strip steel temperature and the furnace roller is reduced, and the buckling of the strip steel is gradually relieved; in a temperature rising state, namely DT/Dt is greater than 0 in figure 2, the temperature of the strip steel is in a temperature rising state, so that the variation of the strip steel is greater than zero, the temperature variation of the strip steel is recently increased along with time, the temperature of the strip steel is higher than the temperature of the furnace roller, the buckling type of the strip steel is cold buckling, the contact time of the strip steel and the furnace roller is reduced by increasing the running speed of the strip steel, the temperature difference between the strip steel and the furnace roller is reduced, and the strip steel buckling is prevented from being aggravated again; if the temperature of the strip steel is unchanged, namely the temperature of the strip steel is constant, the type and the reason of buckling cannot be determined because the temperature of the strip steel is the same as the temperature of the furnace roller, the furnace area is required to be stopped at the moment, and buckling of the strip steel in the heating section is specifically controlled by different measures according to the furnace condition, so that the buckling situation is effectively inhibited.
Step 50: and when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel.
Further, the start-up furnace condition includes: starting the vehicle immediately after stopping the vehicle, and starting the vehicle again after stopping the vehicle and reducing the temperature.
Further, when the furnace condition of the annealing furnace is the shutdown and immediate start-up, and when the furnace condition information is the start-up furnace condition, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel, comprising: controlling the running speed of the strip steel in the furnace zone to be quickly increased to the lowest running speed of the strip steel from 0m/min within a preset time (for example, within 2 minutes).
Further, when the furnace condition of the annealing furnace is that the annealing furnace is started again after being shut down and cooled, when the furnace condition information is the furnace condition when the annealing furnace is started, the operation speed of the strip steel in the furnace area is controlled to be increased to the lowest operation speed of the strip steel, and the method comprises the following steps: and controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages.
Specifically, when buckling of the strip steel occurs, under the condition that the annealing furnace is started, the annealing furnace needs to be started to operate from stop operation, so that the operation speed of the strip steel in the annealing furnace is in a state of increasing the operation speed, but the buckling of the strip steel needs to be specifically controlled according to the buckling condition of the strip steel, so that the buckling of the strip steel is relieved, the starting condition is divided into starting immediately after shutdown (t 1 is less than t2 in fig. 2, namely the actual residence time t1 of the strip steel in the furnace is less than the longest residence time t2), and restarting after shutdown cooling (the actual residence time t1 in the strip steel is more than the longest residence time t2, and the residence time and the temperature of the strip steel are reduced) when the strip steel starts immediately after shutdown, and at the moment, the temperature of the strip steel in the starting furnace is higher than the temperature of a furnace roller in the furnace immediately after shutdown, so that the buckling type of the strip steel is, in order to relieve the cold buckling, the speed needs to be quickly increased to the lowest running speed of the strip steel, so that the contact time of the strip steel and a furnace roller can be reduced, the buckling of the strip steel is avoided to be aggravated, and if the strip steel falls during the quick speed increasing, the furnace temperature needs to be reduced and then the strip steel is started again. If the buckling of the strip steel occurs when the strip steel is started again after being stopped and cooled, the temperature of the strip steel is lower than that of the furnace roller, the buckling is thermal buckling, the running speed of the strip steel is slowly increased to the lowest running speed of the strip steel at the moment, and the hot roller is fully used to avoid the aggravation of the buckling. The method has the advantages that a targeted control strategy is carried out on buckling of the band steel in the heating section according to the specific conditions of the furnace conditions, the control strategy is more accurate, the band breakage accident in the furnace caused by continuous buckling of the buckled band steel in the furnace is effectively inhibited, the stable production of the production line of the annealing furnace is ensured, and the technical effects that the buckling type and the control method are established according to the buckling area in the prior art, and the technical problem that the band steel buckling is aggravated due to inaccurate control method is solved.
Further, the step of controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages comprises: obtaining the thickness of the strip steel; when the thickness T of the strip steel is less than or equal to T0In the first stage, the running speed of the strip steel is controlled to reach the crawling speed v of the strip steel in the furnace areasCrawling t01Duration of time, wherein T0＝[(Tmax-Tmin)/10+Tmin]，t01＝max(lHotsection/vsB) of the group A and B); the second stage controls the strip to (v)s+vr) Speed/2 crawling t02Duration of time, wherein t02＝max(t01,/2,); the third stage controls the strip steel to vrSpeed crawling t03Duration of time, wherein t03Is as follows; when the thickness of the strip steel is Tk-1＜T≤TkAnd the k is the thickness grade of the strip steel and is divided into sections, the k is a positive integer of 3-5, and the operation speed of the strip steel is controlled by the crawling speed v of the strip steel in the furnace section in the first stagesCrawling tk1Duration of time, where tk1＝max((t01-k >); the second stage controls the strip to (v)s+vr) Speed/2 crawling tk2Duration of time, where tk2＝max(tk1,/2,); the third stage controls the strip steel to vrSpeed crawling tk3The length of time is,wherein, tk3Is equivalent to 3-10 min, wherein T is0Based on the thickness, T, of the stripminDesigning a minimum thickness, T, for the stripmaxDesigning the maximum thickness, T, for the stripkIs the upper limit of the thickness interval of the kth group of strip steel, vsFor the furnace zone strip steel creep speed, /)HotsectionIs the length of the hot zone strip, vrAt the lowest operating speed, t01Is the thickness T of the strip steel0Corresponding to the first stage of the strip steel creep time t02Is the thickness T of the strip steel0Corresponding to the crawling time t of the second stage strip steel03Is the thickness T of the strip steel0Corresponding to the third stage of the creep time t of the strip steelk1Is the thickness T of the strip steelkCorresponding to the first stage of the strip steel creep time tk2Is the thickness T of the strip steelkCorresponding to the crawling time t of the second stage strip steelk3Is the thickness T of the strip steelkAnd corresponding to the third-stage band steel crawling time, the shortest hot roller time is 3-10 min.
Particularly, when the belted steel buckling takes place to shut down when cooling back start-up again, this moment because the temperature of belted steel has reduced, and the temperature of furnace roller increases because of the start-up, promptly the belted steel temperature is less than the furnace roller temperature, the buckling that then takes place is the hot buckling, and the hot buckling that takes place when starting up should slowly improve the functioning speed to fully carry out the hot-rolling, make the temperature of furnace roller with the difference in temperature between the belted steel temperature reduces, avoids the aggravation of belted steel buckling condition. And the buckling generated when the car is started again after the car is stopped and cooled down is slowly accelerated in stages, so that the hot roller is fully carried out, the temperature difference between the strip steel and the furnace roller is reduced, the buckling state is adjusted, the thickness factor of the strip steel is considered, different stage strategies are adopted according to different thicknesses, the strip breakage condition is avoided, and the stable production of the annealing furnace production line is ensured.
Example two
In order to better describe the technical characteristics and the application of the control method for inhibiting the buckling of the strip steel in the heating section, the application of the invention will be described in detail with reference to specific embodiments.
The embodiment of the invention relates to an application of a control method for inhibiting buckling of strip steel in a heating section on a 1700 continuous annealing unit of A iron and steel company, wherein the length of a hot zone of an annealing furnace in the 1700 continuous annealing unit of A iron and steel company is 915m, the crawling speed of the furnace zone is 30m/min, the design thickness of the strip steel at the running speed of 60m/min is 0.3-2.5 mm, the application of an immediate start-up strategy on the 1700 continuous annealing unit after shutdown is shown in the following table 1, and the table 1 is an immediate start-up speed control strategy of the 1700 continuous annealing furnace after shutdown:
TABLE 1
The application of the re-start strategy on the 1700 continuous annealing unit after shutdown and temperature reduction is shown in table 2, and the table 2 is the re-start speed control strategy after shutdown and temperature reduction of the 1700 continuous annealing furnace:
TABLE 2
By controlling the buckling strategy through the embodiment of the invention, the buckling condition of the strip steel on the A steel company 1700 continuous annealing unit is effectively controlled, the strip breakage accident in the furnace caused by the continuous buckling of the buckled strip steel in the furnace is inhibited, and the stable production of the annealing furnace production line is ensured.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
the embodiment of the invention provides a control method for inhibiting buckling of strip steel in a heating section, which is applied to an annealing furnace, and when buckling of the strip steel occurs in the heating section of the annealing furnace, the method comprises the following steps: obtaining furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting; when the furnace condition information is the normal production furnace condition, acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller; judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling; if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased; and when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel. The method has the advantages that a targeted control strategy is carried out on buckling of the band steel in the heating section according to the specific conditions of the furnace conditions, the control strategy is more accurate, the band breakage accident in the furnace caused by continuous buckling of the buckled band steel in the furnace is effectively inhibited, the stable production of the production line of the annealing furnace is ensured, and the technical effects that the buckling type and the control method are established according to the buckling area in the prior art, and the technical problem that the band steel buckling is aggravated due to inaccurate control method is solved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (5)
1. A control method for inhibiting buckling of strip steel in a heating section is applied to an annealing furnace, and when buckling of the strip steel occurs in the heating section of the annealing furnace, the method is characterized by comprising the following steps:
obtaining furnace condition information of the annealing furnace, wherein the furnace condition information comprises normal production furnace conditions and furnace conditions during vehicle lifting;
when the furnace condition information is the normal production furnace condition, acquiring the temperature of the strip steel in the annealing furnace and the temperature of a furnace roller;
judging the buckling type of the strip steel according to the temperature of the strip steel and the temperature of the furnace roller, wherein the buckling type of the strip steel comprises hot buckling and cold buckling;
if the buckling type of the strip steel is the hot buckling, the running speed of the strip steel in the furnace area is reduced, and if the buckling type of the strip steel is the cold buckling, the running speed of the strip steel in the furnace area is increased;
when the furnace condition information is the furnace condition during starting, controlling and increasing the running speed of the strip steel in the furnace area to the lowest running speed of the strip steel;
wherein, according to the belted steel temperature with the stove roller temperature, judge the type of belted steel buckling includes:
when the temperature of the strip steel is higher than that of the furnace roller, the buckling type of the strip steel is cold buckling;
when the temperature of the strip steel is lower than the temperature of the furnace roller, the buckling type of the strip steel is thermal buckling;
wherein the start-up furnace conditions include: starting the vehicle immediately after stopping the vehicle, and starting the vehicle again after stopping the vehicle and reducing the temperature;
when the furnace condition of the annealing furnace is the shutdown and immediate start-up, when the furnace condition information is the start-up furnace condition, the operation speed of the strip steel in the furnace area is controlled to be increased to the lowest operation speed of the strip steel, and the method comprises the following steps:
controlling the running speed of the strip steel in the furnace area to be quickly increased to the lowest running speed of the strip steel from 0m/min within preset time;
when the annealing stove furnace condition is when shutting down when cooling back is started again, when the furnace condition information is when the car is started, control improves the functioning speed of stove district belted steel is to the minimum functioning speed of belted steel, include:
controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages;
wherein, the step of controlling the running speed of the strip steel in the furnace area to gradually increase to the lowest running speed of the strip steel in stages comprises the following steps:
obtaining the thickness of the strip steel;
when the thickness T of the strip steel is less than or equal to T0In the first stage, the running speed of the strip steel is controlled to reach the crawling speed v of the strip steel in the furnace areasCrawling t01Duration of time, wherein T0＝[(Tmax-Tmin)/10+Tmin]，t01＝max(lHotsection/vs,)；
The second stage controls the strip to (v)s+vr) Speed/2 crawling t02Duration of time, wherein t02＝max(t01/2,)；
The third stage controls the strip steel to vrSpeed crawling t03Duration of time, wherein t03＝；
When the thickness of the strip steel is Tk-1＜T≤TkAnd the k is the thickness grade of the strip steel and is divided into sections, the k is a positive integer of 3-5, and the operation speed of the strip steel is controlled by the crawling speed v of the strip steel in the furnace section in the first stagesCrawling tk1Duration of time, where tk1＝max((t01-k*),)；
The second stage controls the strip to (v)s+vr) Speed/2 crawling tk2Duration of time, where tk2＝max(tk1/2,)；
The third stage controls the strip steel to vrSpeed crawling tk3Duration of time, wherein tk3≡，
Wherein, T0Based on the thickness, T, of the stripminDesigning a minimum thickness, T, for the stripmaxDesigning the maximum thickness, T, for the stripkIs the upper limit of the thickness interval of the kth group of strip steel, vsFor the furnace zone strip steel creep speed, /)HotsectionIs the length of the hot zone strip, vrAt the lowest operating speed, t01Is the thickness T of the strip steel0Corresponding to the first stage of the strip steel creep time t02Is the thickness T of the strip steel0Corresponding to the crawling time t of the second stage strip steel03Is the thickness T of the strip steel0Corresponding to the third stage of the creep time t of the strip steelk1Is the thickness T of the strip steelkCorresponding to the first stage beltSteel creep time, tk2Is the thickness T of the strip steelkCorresponding to the crawling time t of the second stage strip steelk3Is the thickness T of the strip steelkAnd corresponding to the third-stage band steel crawling time, the shortest hot roller time is 3-10 min.
2. The method of claim 1, wherein the normal production furnace conditions include: a heating state furnace condition, a cooling state furnace condition and a constant temperature state furnace condition.
3. The method of claim 2, wherein when the furnace condition of the annealing furnace is the cooling state furnace condition, if the type of the strip buckling is the hot buckling, the reduction of the running speed of the strip in the furnace area is controlled to be 5-20 m/min.
4. The method of claim 2, wherein when the furnace condition of the annealing furnace is the temperature-rising state furnace condition, if the type of the strip buckling is the cold buckling, the increase of the running speed of the strip in the furnace area is controlled to be 5-20 m/min.
5. The method according to claim 2, wherein when the furnace condition of the annealing furnace is the constant temperature state furnace condition, the strip buckling type is shut down regardless.
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