CN116037879A - Intelligent water distribution method for secondary cooling section of billet continuous casting machine - Google Patents
Intelligent water distribution method for secondary cooling section of billet continuous casting machine Download PDFInfo
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- CN116037879A CN116037879A CN202310080593.6A CN202310080593A CN116037879A CN 116037879 A CN116037879 A CN 116037879A CN 202310080593 A CN202310080593 A CN 202310080593A CN 116037879 A CN116037879 A CN 116037879A
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- secondary cooling
- cooling water
- water distribution
- water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
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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
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to the technical field of metallurgical continuous casting, and particularly discloses a secondary cooling section intelligent water distribution method of a small square billet continuous casting machine, which comprises the steps of establishing a secondary cooling water distribution simulation system, requiring control of secondary cooling water quantity, linking with process conditions of drawing speed, superheat degree and secondary cooling water temperature, and displaying solidification change conditions of a casting blank in real time; the secondary cooling water branch is increased by 5 areas; five areas are added in the three-cooling chamber in a spraying way, spraying pipes are arranged in the upper, lower, left and right directions of a casting blank cooling line of each area, and the spraying pipes are detachably arranged on the supporting frame; establishing a secondary cooling water nozzle blockage early warning system; setting an adjustable mode concrete implementation scheme of the spray pipes and the brackets in each region of the two cold chambers; establishing a secondary cooling water distribution intelligent control system, wherein the secondary cooling water distribution intelligent control system designs 4 sections in total, and 10 specific water quantity curves are designed for each section; the invention solves the problem of frequent labor operation of personnel, solves the problem that the production water cannot be met, and reduces the generation of defective products.
Description
Technical Field
The invention relates to the technical field of metallurgical continuous casting, in particular to a secondary cooling section intelligent water distribution method of a billet continuous casting machine.
Background
The intelligent effect of water distribution of the secondary cooling section is poor, so that the water distribution is difficult to control, the defects of a casting blank are serious, the quality of the casting blank is caused by the reasons of injection angle, atomization effect and the like, such as quality accidents of slip, casting blank segregation, casting blank cracks and the like, and steel leakage accidents are easy to cause. In the current situation that competition in the steel industry is intensified and each steel plant is accelerated and upgraded, the mode cannot meet the requirements. The manual water distribution has the problems that the difference can not be automatically controlled according to the temperature and the casting blank pulling speed, and the quality accident, the steel leakage accident and the like are easily caused.
Taking a 165 x 165 specification billet continuous casting machine, each of which is provided with 8 flows as an example, the current average pulling speed is about 2.8-2.9m/min, and 2 flows are extracted for test after improving intelligent water distribution of the secondary cooling section and poor spraying angle and atomization effect of the secondary cooling section, and the test results are: the average pulling speed of the test flow is 3.2-3.4m/min. And (3) sampling and analyzing the casting blank of the test flow, wherein the quality exceeding phenomenon occurs, and the quality requirement is not met. Therefore, intelligent water distribution is realized, semi-automatic steering is intelligent, and improvement of a secondary cooling section is imperative. Therefore, a secondary cooling section intelligent water distribution method of a small square billet continuous casting machine needs to be designed, and intelligent water distribution research is implemented on a secondary cooling system of the continuous casting machine so as to solve the problem that the secondary cooling water distribution system cannot meet the requirement of casting blank cooling at high drawing speed and solve the production quality accidents such as casting blank slip, crack steel leakage and the like which are easy to cause.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a secondary cooling section intelligent water distribution method of a billet continuous casting machine.
The technical scheme adopted for solving the technical problems is as follows: an intelligent water distribution method for a secondary cooling section of a billet continuous casting machine comprises the following steps:
1) Establishing a secondary cooling water distribution simulation system, requiring the control of the secondary cooling water quantity to be linked with the process conditions of the pulling speed, the superheat degree and the secondary cooling water temperature, and displaying the solidification change condition of the casting blank in real time;
2) The secondary cooling water branch is added with 5 areas, each area comprises a pressure transmitter, a regulating valve and a flowmeter, and the remote transmission pictures of the pressure, valve position and flow signals of each area are displayed on an upper computer;
3) Five areas are added in the three-cooling chamber in a spraying way, spraying pipes are arranged in the upper, lower, left and right directions of a casting blank cooling line of each area, and the spraying pipes are detachably arranged on the supporting frame;
4) Establishing a secondary cooling water nozzle blockage early warning system, and timely finding out the possible situations of nozzle blockage, water leakage and nozzle installation errors by constructing the relationship between the pressure and the flow of each secondary cooling water in each area of a secondary cooling water continuous casting machine, and timely early warning continuous casting to carry out relevant problem investigation;
5) The specific implementation scheme of the adjustable modes of the spray pipes and the brackets in each region of the two cold chambers is formulated, so that the on-line adjustment is realized, and the centering and angle adjustment of the spray pipes are convenient;
6) And 4 sections of the two-cold water distribution intelligent control system are designed to be selectable, 10 specific water quantity curves are designed for each section, the two-cold water distribution intelligent control system performs primary control or secondary control, and an operation interface performs primary control or secondary control.
Preferably, it is: and (3) reselecting and adjusting parameters of the regulating valve of the secondary cooling water in the step (2), wherein the regulating valve is required to be provided with valve position feedback, and the feedback value is displayed on an upper computer and is changed according to a corresponding program.
Preferably, it is: the supporting frame in step 3) is sleeved on the periphery of a casting blank cooling line, positioning frames are arranged on the outer sides of the supporting frame in the upper, lower, left and right directions, two positioning frames are arranged oppositely, a spray pipe is placed between the two positioning frames, the spray pipe adopts square pipes with the specification of 50 multiplied by 5mm, strip-shaped through holes are formed in the positioning frames, pin plates penetrate through the strip-shaped through holes, the pin plates are blocked on the outer sides of the spray pipe, nozzles are arranged on the inner sides of the spray pipe, and the nozzles face the direction of the casting blank cooling line.
Preferably, it is: the current nozzle blockage early warning conditions of all flows in each area are integrally browsed in the secondary cooling water nozzle blockage early warning system in the step 4), the current state of the nozzle is distinguished through colors, after the nozzle type or the water system is replaced and upgraded in each maintenance, the model is trained and calibrated, and warning records, training records, real-time data and fitting curves are checked, so that a user can analyze the problem through a multi-disc conveniently.
Preferably, it is: and (3) respectively setting corresponding specific water volumes according to the 10 specific water volume curves in the step 6).
The invention has the following beneficial effects:
the intelligent water distribution method of the secondary cooling section of the billet continuous casting machine designed by the invention establishes a secondary cooling intelligent water distribution simulation system, and the control of the secondary cooling water quantity is linked with the technological conditions such as the drawing speed, the superheat degree, the secondary cooling water temperature and the like, so as to display the solidification change condition of a casting blank in real time;
1. five areas are added in the three-cooling chamber in a spraying way, the specification of spraying strips is 50 multiplied by 5mm, the thermal deformation in the using process is reduced, and the quick-change function is realized in the connection mode of the spraying strips;
2. the secondary cooling water nozzle blockage early warning system is developed, and the conditions of nozzle blockage, water leakage, nozzle installation errors and the like which possibly occur are timely found out by constructing the relation between the pressure and the flow of each secondary cooling water in each area of the secondary cooling water continuous casting machine, so that the problems related to continuous casting are timely warned and inspected, and the quality loss caused by nozzle blockage is reduced;
3. the installation mode of the spray header of the two cold chambers is optimally designed, and an adjustable water distribution plate is adopted, so that the position and the angle can be conveniently adjusted;
4. the secondary cooling water distribution intelligent control system is designed with 4 sections which can be selected, 10 specific water quantity curves are designed for each section, and the secondary cooling water distribution intelligent control system can perform primary control and secondary control;
5. the qualification rate of casting blanks is 100 percent qualified, the generation of defective products is reduced, and the requirements of customers are met;
6. after the pulling speed is improved, the production efficiency is obviously improved, the steel yield per hour is improved from the original 293t/h to 303t/h, and the annual production is improved by about 16 ten thousand tons;
7. after the intelligent water distribution model operates, the quality of the steel billet is stably and reliably improved and stabilized, and the dynamic water distribution is an improvement on the basis of static water distribution, so that the cooling water distribution of the continuous casting machine is optimized;
8. the industrial control picture is visually displayed, the nozzle blockage alarm system is accurate, and the nozzle of the secondary cooling section, the atomization effect, the injection angle and the water distribution amount are all in the optimal state;
9. in practical application, the casting blank defect problem can be effectively solved, the problem of frequent labor operation of personnel is solved, the problem that the water for production cannot be met is solved, and the process method reaches the domestic leading level.
Drawings
FIG. 1 is a cross-sectional elevation view of a shower mounting.
Fig. 2 is a side view of a shower mounting.
In the figure: 1-a casting blank cooling line; 2-a spray pipe; 3-a support frame; 4-nozzles; 5-a positioning frame; 6-pin plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described in further detail below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-2, a process method for intelligent water distribution in a secondary cooling section of a billet continuous casting machine is implemented by the following steps:
1. principle of technical improvement
Secondary cooling has an important effect on the quality of the cast slab. The formation and development of defects such as internal cracks, surface cracks, bulging, dislocation, center segregation and the like of the continuous casting blank are closely related to secondary cooling.
The cooling mode of the casting blank is optimized by a technician, and the secondary cooling water distribution system is comprehensively modified on the premise of following the metallurgical rule of the maximum liquid core length rule, the surface temperature maximum cooling rate and temperature return rate rule, the straightening point minimum (or maximum) surface temperature rule and the minimum (or maximum) surface temperature rule of the surface of the secondary cooling zone casting blank.
2. Content of technical modification
1. And (3) establishing a secondary cooling water distribution simulation system, requiring the control of the secondary cooling water quantity to be linked with the process conditions of the pulling speed, the superheat degree and the secondary cooling water temperature, and displaying the solidification change condition of the casting blank in real time.
2. The secondary cooling water branch is added with 5 areas, each area comprises a pressure transmitter, a regulating valve and a flowmeter, and the remote transmission pictures of the pressure, valve position and flow signals of each area are displayed on an upper computer; the regulating valve of the secondary cooling water is reselected, parameters are regulated, the regulating valve needs to be provided with valve position feedback, and the feedback value is displayed on an upper computer and is changed according to a corresponding program.
3. Five areas are added in the three-cooling chamber in a spraying way, spraying pipes 2 are arranged in the upper, lower, left and right directions of a casting blank cooling line 1 in each area, and the spraying pipes 2 are detachably arranged on a supporting frame 3; the supporting frame 3 is sleeved on the periphery of the casting blank cooling line 1, the positioning frames 5 are arranged on the outer sides of the supporting frame 3 in the upper, lower, left and right directions, two positioning frames 5 are oppositely arranged in each group, the spray pipe 2 is placed between the two positioning frames 5, the spray pipe 2 adopts square pipes with the specification of 50 multiplied by 5mm, the thermal deformation in the use process is reduced, and the quick-change function is realized in the connection mode of the spray pipe 2.
The positioning frame 5 is provided with a strip-shaped through hole, the strip-shaped through hole is internally penetrated by a pin plate 6, the pin plate 6 is blocked at the outer side of the spray pipe 2, the inner side of the spray pipe 2 is provided with a nozzle 4, the nozzle 4 faces the direction of a casting blank cooling line 1,
4. establishing a secondary cooling water nozzle 4 blockage early warning system, and timely finding out possible conditions of nozzle 4 blockage, water leakage and nozzle 4 installation errors by constructing the relationship between the pressure and the flow of each secondary cooling water in each area of a secondary cooling water continuous casting machine, and timely early warning continuous casting to perform relevant problem investigation; the current nozzle 4 blockage early warning condition of each flow in each area is integrally browsed in the secondary cooling water nozzle blockage early warning system, the state of the current nozzle 4 is distinguished through the color, the type of the nozzle 4 or the water system is replaced and upgraded after each maintenance is carried out through setting time, flow number and area code, the model is trained and calibrated, and warning records, training records, real-time data and fitting curves are checked, so that a user can analyze the problem through the multiple disks conveniently.
5. And an adjustable mode specific implementation scheme of the spray pipe 2 and the bracket in each region of the two cold chambers is formulated, so that on-line adjustment is realized, and the centering and angle adjustment of the spray pipe 2 are convenient.
6. And 4 sections of the two-cold water distribution intelligent control system are designed and can be selected, and the sections of a square billet with 165 multiplied by 165mm are used currently, and the other 3 sections (standby 1, standby 2 and standby 3) are reserved for standby. 10 specific water volume curves are designed for each section, and from a 1# curve, a 2# curve, a 3# curve and a 4# curve … … # curve, the current curves correspond to the following:
the 1# curve corresponds to a water content of 1.2 ratio
The 2# curve corresponds to 1.4 specific water volume
3# curve corresponds to 1.6 specific water volume
The other 7 curves (4 # curve … … # curve) can be used for adjusting the specific water quantity according to the production needs in the future.
The intelligent control system for the secondary cooling water distribution performs primary control or secondary control, and the operation interface selects primary control or secondary control.
6.1 first-level Water control Specification
Taking the specific water quantity of the 1# curve 1.2 as an example, the primary control is adopted, and specific numerical values in the primary control are as follows:
foot roller section:
when the pull speed V is less than 0.4m/min, Q=0.5;
the pulling speed V is more than or equal to 0.4m/min, and V is less than 2.5 m/min;
Q＝(1.39V+7.84)K m 3 /h；
when the pulling speed V is more than or equal to 2.5 m/min:
Q＝(1.01V2-0.34V+5.87)K m 3 /h
spraying for a section:
when the pull speed V is less than 0.6m/min, Q=0.5;
the pulling speed V is more than or equal to 0.6m/min, and V is less than 2.5 m/min;
Q＝(4.07V+4.16)K m 3 /h；
when the pulling speed V is more than or equal to 2.5 m/min:
Q＝(1.28V2-0.44V+7.44)K m 3 /h
spraying two sections:
when the pull speed V is less than 0.8m/min, Q=0.5;
the pulling speed V is more than or equal to 0.8m/min, and V is less than 2.5 m/min;
Q＝(2.07V+4.16)K m 3 /h；
when the pulling speed V is more than or equal to 2.5 m/min:
Q＝(0.54V2-0.18V+3.13)K m 3 /h
and (3) spraying three sections:
when the pull speed V is less than 1.0m/min, Q=0.5;
the pulling speed V is more than or equal to 0.8m/min, and V is less than 2.5 m/min;
Q＝(1.56V-0.12)K m 3 /h；
when the pulling speed V is more than or equal to 2.5 m/min:
Q＝(0.34V2-0.11V+1.96)K m 3 /h
spraying four sections:
when the pull speed V is less than 2.0m/min, Q=0.5;
the pulling speed V is more than or equal to 2.0m/min, and V is less than 2.5 m/min;
Q＝(0.93V-0.06)K m 3 /h；
when the pulling speed V is more than or equal to 2.5 m/min:
Q＝(0.20V2-0.07V+1.17)K m 3 /h
k value in the formula is defaulted to be 1.0, fine adjustment can be carried out according to casting state, the adjustment range is 0.5-1.5, K value can be adjusted by taking 0.1 as a unit each time, for example, if the superheat degree of a tundish is 10 DEG higher, the K value of a foot roller zone can be 1.1 (or higher, depending on casting blank test conditions).
6.2 second-level Water control Specification
Q＝K1[(1+K)(AV^2+BV+C)δ]
K1 is an integral adjusting parameter (which can be manually adjusted) and can be adjusted according to the casting condition, the default value of the system is 1.0, and the adjusting range is 0.5-1.5.
K is a superheat coefficient (automatic control), the value is 0 when the superheat degree of normal casting is less than or equal to 30, the value is 0.1 when the superheat degree is 30 < superheat degree is less than or equal to 40, and the value is 0.2 when the superheat degree is more than 40.
Delta is the secondary cooling water coefficient (automatic control), the secondary cooling water temperature is set to be 30 DEG normally, the on-site secondary cooling water temperature value is read, the data is subtracted by 30, the range from-5 to 5 is 1, if the data is more than 5 to 1.004, the data is more than 10 to 1.008, and the data is more than 15 to 1.012. With-5 being 0.996, with-10 being 0.992, with-15 being 0.988. A. B, C with reference to primary water control. A. B, C and the primary secondary cooling control remain similar. A. B, C is identical to the primary control. K is the superheat control, and the normal value is 1.0.
7. The two-cold spraying connection mode is changed from the prior nut plane seal to the nut spherical seal, thereby avoiding the phenomena of aging of an internal sealing gasket or coking when encountering high temperature, and the like, and easily causing the problem of water leakage.
The present invention is not limited to the above embodiments, and any person who can learn the structural changes made under the teaching of the present invention can fall within the scope of the present invention if the present invention has the same or similar technical solutions.
The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.
Claims (5)
1. The intelligent water distribution method for the secondary cooling section of the billet continuous casting machine is characterized by comprising the following steps of:
1) Establishing a secondary cooling water distribution simulation system, requiring the control of the secondary cooling water quantity to be linked with the process conditions of the pulling speed, the superheat degree and the secondary cooling water temperature, and displaying the solidification change condition of the casting blank in real time;
2) The secondary cooling water branch is added with 5 areas, each area comprises a pressure transmitter, a regulating valve and a flowmeter, and the remote transmission pictures of the pressure, valve position and flow signals of each area are displayed on an upper computer;
3) Five areas are added in the three-cooling chamber in a spraying way, spraying pipes are arranged in the upper, lower, left and right directions of a casting blank cooling line of each area, and the spraying pipes are detachably arranged on the supporting frame;
4) Establishing a secondary cooling water nozzle blockage early warning system, and timely finding out the possible situations of nozzle blockage, water leakage and nozzle installation errors by constructing the relationship between the pressure and the flow of each secondary cooling water in each area of a secondary cooling water continuous casting machine, and timely early warning continuous casting to carry out relevant problem investigation;
5) The specific implementation scheme of the adjustable modes of the spray pipes and the brackets in each region of the two cold chambers is formulated, so that the on-line adjustment is realized, and the centering and angle adjustment of the spray pipes are convenient;
6) And 4 sections of the two-cold water distribution intelligent control system are designed to be selectable, 10 specific water quantity curves are designed for each section, the two-cold water distribution intelligent control system performs primary control or secondary control, and an operation interface performs primary control or secondary control.
2. The intelligent water distribution method for the secondary cooling section of the billet caster of claim 1, wherein: and (3) reselecting and adjusting parameters of the regulating valve of the secondary cooling water in the step (2), wherein the regulating valve is required to be provided with valve position feedback, and the feedback value is displayed on an upper computer and is changed according to a corresponding program.
3. The intelligent water distribution method for the secondary cooling section of the billet caster of claim 1, wherein: the supporting frame in step 3) is sleeved on the periphery of a casting blank cooling line, positioning frames are arranged on the outer sides of the supporting frame in the upper, lower, left and right directions, two positioning frames are arranged oppositely, a spray pipe is placed between the two positioning frames, the spray pipe adopts square pipes with the specification of 50 multiplied by 5mm, strip-shaped through holes are formed in the positioning frames, pin plates penetrate through the strip-shaped through holes, the pin plates are blocked on the outer sides of the spray pipe, nozzles are arranged on the inner sides of the spray pipe, and the nozzles face the direction of the casting blank cooling line.
4. The intelligent water distribution method for the secondary cooling section of the billet caster of claim 1, wherein: the current nozzle blockage early warning conditions of all flows in each area are integrally browsed in the secondary cooling water nozzle blockage early warning system in the step 4), the current state of the nozzle is distinguished through colors, after the nozzle type or the water system is replaced and upgraded in each maintenance, the model is trained and calibrated, and warning records, training records, real-time data and fitting curves are checked, so that a user can analyze the problem through a multi-disc conveniently.
5. The intelligent water distribution method for the secondary cooling section of the billet caster of claim 1, wherein: and (3) respectively setting corresponding specific water volumes according to the 10 specific water volume curves in the step 6).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116618594A (en) * | 2023-07-26 | 2023-08-22 | 兴化市盛大精密铸钢有限公司 | Casting blank guiding water spraying device of square billet continuous casting machine |
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2023
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116618594A (en) * | 2023-07-26 | 2023-08-22 | 兴化市盛大精密铸钢有限公司 | Casting blank guiding water spraying device of square billet continuous casting machine |
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