CN112958751A - Online prediction and management method for continuous casting secondary cooling state - Google Patents
Online prediction and management method for continuous casting secondary cooling state Download PDFInfo
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- CN112958751A CN112958751A CN202110113632.9A CN202110113632A CN112958751A CN 112958751 A CN112958751 A CN 112958751A CN 202110113632 A CN202110113632 A CN 202110113632A CN 112958751 A CN112958751 A CN 112958751A
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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
Abstract
The invention relates to an online prediction and management method for a continuous casting secondary cooling state, belonging to the technical field of steelmaking and continuous casting. The technical scheme of the invention is as follows: developing software which can automatically acquire the water partial pressure and water flow of each branch, judge the working state of the secondary cooling branch and have the management function of the secondary cooling nozzle; software is used for automatically collecting the water partial pressure and the water flow of each branch at certain intervals in the continuous casting production process, logic judgment is carried out, and a judgment result is output. The invention has the beneficial effects that: under the condition of not increasing detection equipment of a continuous casting machine, an automatic control system instrument of the continuous casting machine is utilized to develop an online prediction and management method for the continuous casting secondary cooling state, additional investment is not needed, simplicity and effectiveness are achieved, the labor intensity of workers is reduced, and the method has an important supporting function for enhancing the uniformity of continuous casting secondary cooling and improving the quality of a casting blank.
Description
Technical Field
The invention relates to an online prediction and management method for a continuous casting secondary cooling state, belonging to the technical field of steelmaking and continuous casting.
Background
The continuous casting technology is that molten liquid metal is injected into a crystallizer, a primary solid blank shell is formed through the intensive cooling of a water-cooled copper plate, the blank shell enters a secondary cooling area of water mist spraying after exiting the crystallizer, and an inner molten steel liquid core is continuously solidified. The internal quality and the surface quality of the continuous casting slab are closely related to the secondary cooling effect. CN110788290A, CN108907127A and CN200963677Y disclose how to reduce nozzle clogging, and have certain effect in preventing clogging. However, in actual production, the blockage of the nozzle or the water leakage of the water channel of the spray frame cannot be completely avoided, and once the water flow distribution originally designed is changed abnormally, the casting blank quality is deteriorated. In order to keep the reasonableness of the distribution of the secondary cooling water, the operator is often required to enter the secondary cooling section to check the states of the nozzles one by one when the machine is stopped. However, a slab caster with one machine and one machine for one day often has hundreds of two cooling nozzles, which not only has high labor intensity, but also can not really check one by one, so that the secondary cooling effect of the caster is difficult to maintain in an optimal state. In this context, it is particularly important and urgent to develop a method capable of accurately predicting the state of the secondary cooling nozzle on line.
And the CN105880502A is provided with a vibration detector on the nozzle or the nozzle pipeline or other parts only fixedly connected with the nozzle, and the working state of the nozzle is judged by comparing the detected real-time vibration wave data with the reference vibration wave data. According to the invention, the CN103487249A is provided with the wireless temperature measurement node near the nozzle, and temperature measurement result data is transmitted to the upper computer through the wireless sensor to judge the state of the nozzle. Both the above two patents need to install a large amount of sensors additionally, so that the investment is large, the maintenance cost is high, and the management is difficult. CN104568410A utilizes the automatic control system of the continuous casting machine itself to compare the theoretical flow value and the measured flow value of each nozzle, thereby judging whether each nozzle is blocked or leaked. The invention is a very reliable on-line judging method of the working state of the secondary cooling nozzle, which is simple to operate. The invention adopts the deviation percentage of the theoretical flow and the actual flow as the judgment of the secondary cooling water supply state (including unblocked water paths, slight blockage and serious blockage), but the percentage is the same fixed value for each independent water supply branch, which is obviously not reasonable. In addition, none of the above methods has a nozzle daily management function.
Disclosure of Invention
The invention aims to provide an online prediction and management method for a continuous casting secondary cooling state, which is developed by utilizing an automatic control system instrument of a continuous casting machine under the condition of not increasing detection equipment of the continuous casting machine, does not need additional investment, is simple and effective, reduces the labor intensity of workers, has an important supporting function for enhancing the uniformity of continuous casting secondary cooling and improving the quality of a casting blank, and effectively solves the problems in the background technology.
The technical scheme of the invention is as follows: an online prediction and management method for a continuous casting secondary cooling state comprises the following steps: opening secondary cold water, continuously increasing the opening of a valve for each water supply branch by using the existing automatic control system of the continuous casting machine, recording the water partial pressure and the water flow of each region after the water partial pressure is stable, and establishing a mathematical relation between the water partial pressure and the water flow for each water supply branch; developing software which can automatically acquire the water partial pressure and water flow of each branch, judge the working state of the secondary cooling branch and have the management function of the secondary cooling nozzle, wherein the software interface is shown in the first drawing; the software is used for automatically acquiring the water partial pressure and the water flow of each branch in the continuous casting production process, carrying out logic judgment and outputting a judgment result, and the logic operation rule is shown as the attached figure II and is described as follows:
In the formula: qiThe actual water flow rate for the ith water supply circuit,
the ideal water flow rate of the ith water supply circuit is related to the water partial pressure of the ith water supply circuit; a isiIs a weight coefficient set for the ith water supply loop, 0 < ai＜1；biIs a mild coefficient set for the ith water supply loop, 0 < bi＜ai。aiAnd biThe actual number of the blocked nozzles and the water leakage degree are taken as the basis, and parameters set by human experience are combined.
When the relation between the actual water flow and the actual water partial pressure accords with the relation of 'serious blockage' or 'serious water leakage', the software interface generates red flashing alarm information at the corresponding water supply branch; when the relation of light blockage or light water running is met, the software interface generates yellow prompt information at the corresponding water supply branch; when the 'normal' relationship is met, the software interface is displayed as green at the corresponding water supply branch.
The treatment measures are as follows, when red flashing alarm information of 'serious blockage' or 'serious water leakage' is triggered, shutdown should be arranged in time for checking, replacing and maintaining; when the yellow warning of 'slight blockage' and 'slight water leakage' appears, the warning area is subjected to key inspection when the machine is stopped next time.
The nozzle management function is integrated, and the first triggering time of the alarm information of 'serious blockage' and 'serious water leakage' is automatically recorded; workers enter a secondary cooling room by using the downtime to check the state of the nozzle, and the checking result is recorded into software, so that a basis is provided for correcting the 'mild coefficient' and the 'severe coefficient'; the worker enters replacement nozzle information and other maintenance into the software.
The invention has the beneficial effects that: under the condition of not increasing detection equipment of a continuous casting machine, an automatic control system instrument of the continuous casting machine is utilized to develop an online prediction and management method for a continuous casting secondary cooling state, additional investment is not needed, simplicity and effectiveness are achieved, the labor intensity of workers is reduced, the daily management function of the secondary cooling working state is realized, and the method has an important supporting function for enhancing the uniformity of continuous casting secondary cooling and improving the quality of a casting blank.
Drawings
FIG. 1 is an interface diagram of online prediction and management software for continuous casting secondary cooling conditions;
FIG. 2 is a schematic diagram of a logical operation;
fig. 3 is a practical operation diagram of the on-line prediction and management software of the continuous casting secondary cooling state in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the following will describe the technical solutions of the embodiments of the present invention clearly, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Example (b):
step 1: and during the shutdown of the continuous casting machine, checking whether the cooling water of the foot roll, the secondary cooling water supply branches of the bending section and all the fan-shaped sections are blocked or leak water, and if so, maintaining until no blockage or no water leakage exists.
Step 2: and (2) starting secondary cold water, increasing the opening degree of the valve from 5% to 100% by utilizing the existing automatic control system of the continuous casting machine aiming at each water supply branch, taking 5% as an adjustment step length, and recording the water partial pressure and the water flow of each area after the water partial pressure is stable after each adjustment.
And step 3: through regression analysis, a mathematical relation between the water flow and the water partial pressure of each water supply branch is obtained, and the mathematical relation is the relation between the water flow and the water partial pressure in an ideal secondary cooling state and is shown in the following table.
TABLE 1 mathematical relationship between water flow and partial pressure of water
| Water supply branch | Mathematical relation (Q water flow L/min, P water pressure Mpa) |
| 1 zone wide face | Q＝1462.9P+80.201，R2＝0.9943 |
| |
Q＝240.86P+35.097，R2＝0.989 |
| Zone 2 inner and outer arcs | Q＝1044.9P-13.627，R2＝0.9926 |
| Zone 3 inner and outer arcs | Q＝2577.7P-160.29，R2＝0.9717 |
| Zone 4 outer arc | Q＝402.13P-30.938，R2＝0.9922 |
| 4 inner arc | Q＝371.86P-21.345，R2＝0.9943 |
| Zone 5 outer arc | Q＝730.32P+44.747，R2＝0.9692 |
| Zone 5 inner arc | Q＝628.03P-82.863，R2＝0.9799 |
| Outer arc of zone 6 | Q＝477.79P-1.9575，R2＝0.9869 |
| Inner arc of 6 zone | Q＝876.41P-41.680，R2＝0.9790 |
| 7 zone outer arc | Q＝901.31P-87.234，R2＝0.9996 |
| 7 inner arc | Q＝239.73P-10.239，R2＝0.9913 |
| Zone 8 | Q＝657.20P-60.795，R2＝0.9231 |
And 4, step 4: and (3) presetting the mathematical relationship shown in the step (3) into software during programming, starting online prediction and management software of the continuous casting secondary cooling state when the continuous casting machine works normally, and continuously searching and correcting the 'mild coefficient' and the 'severe coefficient' after comparing a software prediction result with an inspection result, wherein the 'mild coefficient' and the 'severe coefficient' are shown in a table 2. The 'light coefficient' and 'heavy coefficient' are input at the corresponding interface of the on-line prediction and management software of the continuous casting secondary cooling state.
TABLE 2 Mild and Severe coefficients for each zone
| Water supply branch | Mild degree coefficient a | Coefficient of |
| 1 zone wide face | 0.05 | 0.21 |
| |
0.06 | 0.24 |
| Zone 2 inner and outer arcs | 0.05 | 0.22 |
| Zone 3 inner and outer arcs | 0.07 | 0.30 |
| Zone 4 outer arc | 0.06 | 0.31 |
| 4 inner arc | 0.07 | 0.26 |
| Zone 5 outer arc | 0.06 | 0.20 |
| Zone 5 inner arc | 0.06 | 0.16 |
| Outer arc of zone 6 | 0.06 | 0.22 |
| Inner arc of 6 zone | 0.08 | 0.24 |
| 7 zone outer arc | 0.08 | 0.25 |
| 7 inner arc | 0.06 | 0.25 |
| Zone 8 | 0.06 | 0.16 |
And 5: when the software predicts 'serious blockage' or 'serious water leakage', the red alarm signal indicator lamp flickers to indicate that shutdown needs to be arranged in time for checking, replacing and maintaining; when the software predicts light blockage and light water leakage, the yellow warning signal lamp flickers, and the warning area is mainly inspected when the machine is stopped next time. Software automatically records the first time that the alarm information of 'serious blockage' and 'serious water leakage' is triggered. And entering a secondary cooling chamber for inspecting or replacing the nozzle by using the downtime, and recording an inspection result or replacement information into a corresponding interface of online prediction and management software of the secondary cooling state of the continuous casting to realize the daily management of the secondary cooling state of the continuous casting machine.
Claims (5)
1. An online prediction and management method for a continuous casting secondary cooling state is characterized by comprising the following steps: opening secondary cold water, continuously increasing the opening of a valve for each water supply branch by using the existing automatic control system of the continuous casting machine, recording the water partial pressure and the water flow of each region after the water partial pressure is stable, and establishing a mathematical relation between the water partial pressure and the water flow for each water supply branch; developing software which can automatically acquire the water partial pressure and water flow of each branch, judge the working state of the secondary cooling branch and have the management function of the secondary cooling nozzle; the software is used for automatically collecting the water partial pressure and the water flow of each branch in the continuous casting production process, carrying out logic judgment and outputting a judgment result.
2. The on-line prediction and management method of the secondary cooling state of the continuous casting according to claim 1, characterized in that: a light coefficient and a heavy coefficient setting window is reserved for each independent secondary cooling water supply loop, and the logic for judging the working state of the secondary cooling branch is as follows:
In the formula: qiThe actual water flow rate for the ith water supply circuit,
the ideal water flow rate of the ith water supply circuit is related to the water partial pressure of the ith water supply circuit; a isiIs a weight coefficient set for the ith water supply loop, 0 < ai＜1；biIs a mild coefficient set for the ith water supply loop, 0 < bi＜ai；aiAnd biThe parameters are set by human experience based on the actual nozzle blockage number and the water leakage degree.
3. The on-line prediction and management method of the secondary cooling state of the continuous casting according to claim 2, characterized in that: when the relation between the actual water flow and the actual water partial pressure accords with the serious blockage or serious water leakage relation, the software interface generates red flashing alarm information at the position corresponding to the water supply branch; when the slight blockage or slight water leakage relation is met, the software interface generates yellow prompt information at the position corresponding to the water supply branch; and when the normal relation is met, the software interface is displayed as green at the position corresponding to the water supply branch.
4. The on-line prediction and management method of the secondary cooling state of continuous casting according to claim 3, characterized in that: the treatment measures are as follows, when the red flashing alarm information of serious blockage or serious water leakage is triggered, the machine should be scheduled to be shut down in time for checking, replacing and maintaining; when slight blockage and slight water leakage yellow warning occur, key inspection and replacement are carried out on the warning area when the machine is stopped next time.
5. The on-line prediction and management method of the secondary cooling state of the continuous casting according to claim 2, characterized in that: the nozzle management function is integrated, and the time for triggering the serious blockage and the serious water leakage alarm information for the first time is automatically recorded; workers enter a secondary cooling room by using the downtime to check the state of the nozzle, and the checking result is recorded into software to provide a basis for correcting the mild coefficient and the severe coefficient; the worker enters replacement nozzle information and other maintenance into the software.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026256A (en) * | 2022-07-11 | 2022-09-09 | 中冶赛迪工程技术股份有限公司 | Identification method and system for continuous casting secondary cooling spraying state |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2477925A1 (en) * | 1980-03-13 | 1981-09-18 | Fives Cail Babcock | METHOD FOR CONTROLLING THE COOLING OF THE COLORED PRODUCT IN A CONTINUOUS CASTING PLANT |
| JPS57154364A (en) * | 1981-03-20 | 1982-09-24 | Kobe Steel Ltd | Controlling method for surface temperature of ingot in continuous casting |
| CN101347822A (en) * | 2008-09-12 | 2009-01-21 | 攀钢集团研究院有限公司 | Method for testing on-line temperature field of bloom continuous casting and method for controlling secondary cooling water |
| CN104722735A (en) * | 2015-04-08 | 2015-06-24 | 安徽工业大学 | Detecting device of nozzle operating condition in continuous casting secondary cooling area with laser |
| CN106180622A (en) * | 2016-07-18 | 2016-12-07 | 中冶赛迪工程技术股份有限公司 | The dynamic judgment method of a kind of secondary cooling nozzle of continuous casting duty and system |
| CN111451469A (en) * | 2020-03-09 | 2020-07-28 | 柳州钢铁股份有限公司 | Method and device for judging state of continuous casting secondary cooling water nozzle |
| CN111651729A (en) * | 2020-06-02 | 2020-09-11 | 山东莱钢永锋钢铁有限公司 | Method for predicting blockage of secondary cooling water nozzle in continuous casting |
-
2021
- 2021-01-27 CN CN202110113632.9A patent/CN112958751A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2477925A1 (en) * | 1980-03-13 | 1981-09-18 | Fives Cail Babcock | METHOD FOR CONTROLLING THE COOLING OF THE COLORED PRODUCT IN A CONTINUOUS CASTING PLANT |
| JPS57154364A (en) * | 1981-03-20 | 1982-09-24 | Kobe Steel Ltd | Controlling method for surface temperature of ingot in continuous casting |
| CN101347822A (en) * | 2008-09-12 | 2009-01-21 | 攀钢集团研究院有限公司 | Method for testing on-line temperature field of bloom continuous casting and method for controlling secondary cooling water |
| CN104722735A (en) * | 2015-04-08 | 2015-06-24 | 安徽工业大学 | Detecting device of nozzle operating condition in continuous casting secondary cooling area with laser |
| CN106180622A (en) * | 2016-07-18 | 2016-12-07 | 中冶赛迪工程技术股份有限公司 | The dynamic judgment method of a kind of secondary cooling nozzle of continuous casting duty and system |
| CN111451469A (en) * | 2020-03-09 | 2020-07-28 | 柳州钢铁股份有限公司 | Method and device for judging state of continuous casting secondary cooling water nozzle |
| CN111651729A (en) * | 2020-06-02 | 2020-09-11 | 山东莱钢永锋钢铁有限公司 | Method for predicting blockage of secondary cooling water nozzle in continuous casting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115026256A (en) * | 2022-07-11 | 2022-09-09 | 中冶赛迪工程技术股份有限公司 | Identification method and system for continuous casting secondary cooling spraying state |
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Application publication date: 20210615 |