CN110576160A - control system and method for crystallizer water of continuous casting machine - Google Patents
control system and method for crystallizer water of continuous casting machine Download PDFInfo
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- CN110576160A CN110576160A CN201910920067.XA CN201910920067A CN110576160A CN 110576160 A CN110576160 A CN 110576160A CN 201910920067 A CN201910920067 A CN 201910920067A CN 110576160 A CN110576160 A CN 110576160A
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- casting machine
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 129
- 238000009749 continuous casting Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052802 copper Inorganic materials 0.000 claims abstract description 25
- 239000010949 copper Substances 0.000 claims abstract description 25
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000005266 casting Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a control system and method for crystallizer water of a continuous casting machine, belonging to the technical field of metallurgy. The system comprises a crystallizer water inlet system with a water quantity disturbance function, a crystallizer system and a crystallizer water outlet system; the invention aims to provide a control system and a control method for crystallizer water of a continuous casting machine, which reduce or eliminate the boundary layer of crystallizer cooling water on the surface of a copper plate of the crystallizer by changing the flowing form of the crystallizer water in a water gap of the crystallizer, namely changing the laminar flow mode into the turbulent flow mode, thereby reducing the thermal resistance between the copper plate and the copper plate of the crystallizer, improving the heat transfer effect and improving the thickness and the strength of a blank shell in the crystallizer. The method is simple, low in cost and convenient to maintain.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a control system and method for crystallizer water of a continuous casting machine.
Background
As the economy of China shifts from a high-speed growth stage to a high-quality development stage, higher requirements are put forward on the improvement of the production efficiency of enterprises, in the field of the steel industry, the four major processes from raw materials to finished products are generally carried out, namely blast furnace iron making, converter steel making, continuous casting blank forming and steel rolling finished products, and at present, the continuous casting blank forming is a restrictive process for realizing high efficiency, so that the improvement of the continuous casting efficiency is the key for improving the production efficiency of the steel industry.
Continuous casting is a process of converting liquid molten steel into a solid casting blank with a specific shape by using liquid molten steel as a main raw material through a crystallizer, a guide roll, secondary cooling and other process links as shown in figure 1.
The biggest reason why the increase of the drawing speed in the continuous casting process is difficult to realize is that the probability of the occurrence of a breakout accident in the crystallizer area is greatly increased under high drawing speed, and huge economic loss is caused. The reason for the improvement of the breakout rate is 2: 1) internal factors, namely short stay time of a casting blank in the crystallizer at a high pulling speed, thin shell and high temperature, lead to low tensile strength; 2) under the external factor-high drawing speed, the friction force between the blank shell and the crystallizer is increased.
In order to solve the above problems, Daneliercado Tunni et al have proposed a high-efficiency continuous casting mold (patent name: a high-efficiency continuous casting mold patent number: 201420063767.4) in which a plurality of strip-shaped grooves are punched on the inner surface of the copper tube of the mold. So as to realize high casting speed pouring and high defect-free rate of casting blanks. Simultaneously, very big improvement the life of copper pipe. A novel crystallizer copper pipe (patent name: plum blossom mold copper pipe, patent number: 201520168790.4) is provided by the mesometallurgy continuous casting Li Fushuai and the like, the cross section of the upper curved surface of the crystallizer copper pipe is convex, the cross section of the middle curved surface is rectangular, and the cross section of the lower curved surface is rectangular with four convex corners, so that the surface temperature of a blank shell of the crystallizer copper pipe is more uniform along the circumferential length direction of the cross section, and the purpose of higher blank drawing speed is realized.
According to the scheme, in order to improve the pulling speed, the structure of the crystallizer is optimized, so that the structure of the crystallizer becomes complex, and the required processing and maintenance cost is high.
Disclosure of Invention
in view of the above, the present invention provides a system and a method for controlling water in a crystallizer of a continuous casting machine, which change a flow form of the water in a water gap of the crystallizer, i.e., a laminar flow manner into a turbulent flow manner, so as to reduce or eliminate a boundary layer of cooling water of the crystallizer on a copper plate surface of the crystallizer, thereby reducing a thermal resistance between the copper plate and the copper plate of the crystallizer, so as to improve a heat transfer effect and improve a thickness and strength of a blank shell in the crystallizer. The method is simple, low in cost and convenient to maintain.
in order to achieve the purpose, the invention provides the following technical scheme:
A control system for crystallizer water of a continuous casting machine comprises a crystallizer water inlet system, a crystallizer system and a crystallizer water outlet system which are sequentially connected and used for water quantity disturbance.
Optionally, the crystallizer water inlet system includes a crystallizer normal state water inlet subsystem and a crystallizer emergency state water inlet subsystem.
Optionally, the crystallizer normal state water inlet subsystem comprises a pneumatic regulating valve for remote regulation, a check valve and a water inlet pipeline.
optionally, the crystallizer emergency state water inlet subsystem comprises a check valve and a water inlet pipeline.
Optionally, a local pressure gauge and a temperature sensor I are arranged between the crystallizer water inlet system and the crystallizer system.
Optionally, in the crystallizer system, a crystallizer copper plate, a crystallizer water seam, crystallizer cooling water and a crystallizer back plate are sequentially arranged along a direction away from the inner cavity of the crystallizer.
Optionally, the crystallizer water gap is formed by a gap between a crystallizer back plate and a crystallizer copper plate, and is used for enabling crystallizer cooling water to flow through the crystallizer water gap and continuously take away heat.
optionally, the crystallizer water outlet system comprises a temperature sensor II, a flow sensor and a water outlet pipeline.
The control method of the crystallizer water of the continuous casting machine based on the system sets a target set value Qi of the water inlet amount of the crystallizer system, wherein the target set value Qi comprises a conventional set water amount Qc and a disturbance water amount Qt, and Qi is Qc + Qt;
the disturbed water quantity Qt is related to the conventional set water quantity Qc and changes along with time;
Disturbed water quantity Qt＝Asin(ωt)，A＝αQcWherein alpha is 1-10%, omega is pi-20 pi, and t is time unit s;
disturbed water quantity Qt，
A＝αQcWherein alpha is 1-10%, t1，t2The value range of the time period is 5 s-20 s, T is the period, omega is pi-20 pi, and T is the time unit s;
When the water amount is set, the crystallizer with the disturbance amount is directly and dynamically adjusted through a flow regulating valve or is realized by independently setting a disturbance water amount water path.
Optionally, the temperature sensor I transmits the measured temperature of the cooling water of the crystallizer to the programmable logic controller PLC, and performs a high temperature alarm, and when the temperature of the cooling water is higher than a certain temperature, sends an alarm signal to the PLC;
The temperature sensor II remotely transmits the measured temperature To the PLC system, performs temperature difference alarm, and transmits an alarm signal To the PLC system when the temperature difference To-Ti between the water temperature To of the crystallizer water outlet system and the water temperature Ti of the crystallizer water inlet system is greater than a certain value;
The flow sensor transmits a flow signal to the PLC system, and when the flow is larger than a set value and exceeds a certain limit, a high-flow alarm signal is transmitted to the PLC system; or when the flow is lower than a set value by a certain limit, transmitting a low-flow alarm signal to the PLC system.
The invention has the beneficial effects that: the function of reducing the cooling water boundary layer between the crystallizer water and the crystallizer copper plate can be realized by simply modifying the crystallizer water inlet system or dynamically adjusting the flow regulating valve of the crystallizer water inlet system, so that the thermal resistance between the crystallizer water and the crystallizer copper plate is reduced, and the purpose of improving the heat transfer efficiency is further achieved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of a continuous caster;
FIG. 2 is a schematic view of a crystallizer cooling system;
FIG. 3 is a schematic diagram of a crystallizer.
Reference numerals: the system comprises a crystallizer water inlet system 1, a crystallizer system 2, a crystallizer water outlet system 3, a pneumatic regulating valve 101, a check valve 102, a crystallizer emergency state water inlet subsystem 103, a temperature sensor 104, a local pressure gauge 105, liquid molten steel 201, a crystallizer copper plate 202, a crystallizer water seam 203, a crystallizer back plate 204, a solidified shell 205, a temperature sensor 301, a flow sensor 302 and a crystallizer return water pipeline 303.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-3, the reference numbers in the figures refer to the following elements: the crystallizer water system comprises a crystallizer water inlet system 1 with a water quantity disturbance function, a crystallizer system 2, a crystallizer water outlet system 3, a pneumatic regulating valve 101, a check valve 102, a crystallizer emergency state water inlet subsystem 103, a temperature sensor 104, a local pressure gauge 105, liquid molten steel 201, a crystallizer copper plate 202, a crystallizer water seam 203, a crystallizer back plate 204, a solidified shell 205, a temperature sensor 301, a flow sensor 302 and a crystallizer water return pipeline 303.
The invention is suitable for the continuous casting process, and provides a control system and a control method for crystallizer water of a continuous casting machine.
A crystallizer water inlet system with a water quantity disturbance function comprises a crystallizer normal state water inlet subsystem and a crystallizer emergency state water inlet subsystem.
optionally, the crystallizer normal state water inlet subsystem comprises a pneumatic adjusting valve, a check valve and a water inlet pipeline which can be remotely adjusted.
Alternatively, the flow rate adjustment valve has a function of remote adjustment, that is, a function of adjusting the opening degree of the valve by an electric signal.
Alternatively, the target crystallizer feed water quantity set value Qi includes a regular set water quantity Qc-400L/min and a disturbance water quantity Qt-20 sin (1.5t), and Qi-Qc + Qt.
Optionally, the set water amount of the crystallizer with the disturbance amount can be directly and dynamically adjusted through a flow control valve, and can also be realized by independently setting a disturbance water amount waterway.
Optionally, the crystallizer emergency state water inlet subsystem comprises a check valve and a water inlet pipeline.
optionally, before the pipeline of the water inlet system of the crystallizer is connected to the crystallizer, a local pressure gauge and a temperature sensor are installed.
Alternatively, the temperature sensor has a function of transmitting the measured temperature of the cooling water of the crystallizer to a PLC (programmable logic controller) and a high temperature alarm function, and when the temperature of the inlet water of the cooling water is higher than a certain temperature, such as 40 ℃, an alarm signal is sent to the PLC.
a crystallizer system is characterized in that a crystallizer copper plate, a crystallizer water seam, crystallizer cooling water and a crystallizer back plate are sequentially arranged along the direction away from an inner cavity of a crystallizer.
Optionally, the crystallizer water gap is formed by a gap between a crystallizer back plate and a crystallizer copper plate, and crystallizer cooling water flows through the crystallizer water gap and continuously takes away heat.
A crystallizer water outlet system comprises a temperature sensor, a flow sensor and a water outlet pipeline.
Optionally, the temperature sensor has a function of remotely transmitting the measured temperature To the PLC system, and the temperature sensor has a temperature difference alarm function, and transmits an alarm signal To the PLC system when a temperature difference To-Ti between a water temperature To of the crystallizer water outlet system and a water temperature Ti of the crystallizer water inlet system is greater than a certain value, for example, 10 ℃.
Alternatively, the flow sensor has a function of transmitting a flow signal to the PLC system, and the flow sensor has a function of transmitting a flow high alarm signal to the PLC system when the flow is greater than a set value by more than a certain limit, for example, by more than 110% of the set value. Or when the flow rate is lower than the set value by a certain limit, such as lower than 90 percent of the set value, the low-flow alarm signal is transmitted to the PLC system.
The working principle of the invention is as follows: the flowing form of the crystallizer water in the water gap of the crystallizer is changed from a laminar flow mode to a turbulent flow mode, so that the boundary layer of the crystallizer cooling water on the surface of the crystallizer copper plate is reduced or eliminated, the thermal resistance between the copper plate and the crystallizer copper plate is further reduced, the heat transfer effect is improved, and the thickness and the strength of the blank shell in the crystallizer are improved.
finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A control system of crystallizer water of a continuous casting machine is characterized in that: the system comprises a crystallizer water inlet system, a crystallizer system and a crystallizer water outlet system which are connected in sequence and used for water quantity disturbance.
2. The control system of crystallizer water of continuous casting machine according to claim 1, characterized in that: the crystallizer water inlet system comprises a crystallizer normal state water inlet subsystem and a crystallizer emergency state water inlet subsystem.
3. The control system of crystallizer water of continuous casting machine according to claim 2, characterized in that: the crystallizer normal state water inlet subsystem comprises a pneumatic regulating valve for remote regulation, a check valve and a water inlet pipeline.
4. the control system of crystallizer water of continuous casting machine according to claim 2, characterized in that: the crystallizer emergency state water inlet subsystem comprises a check valve and a water inlet pipeline.
5. The control system of crystallizer water of continuous casting machine according to claim 1, characterized in that: and a local pressure gauge and a temperature sensor I are arranged between the crystallizer water inlet system and the crystallizer system.
6. The control system of crystallizer water of continuous casting machine according to claim 1, characterized in that: in the crystallizer system, a crystallizer copper plate, a crystallizer water seam, crystallizer cooling water and a crystallizer back plate are sequentially arranged along the direction far away from the inner cavity of the crystallizer.
7. The control system of crystallizer water of continuous casting machine according to claim 6, characterized in that: the crystallizer water gap is formed by a crystallizer back plate and a crystallizer copper plate gap and is used for enabling crystallizer cooling water to flow through the crystallizer water gap and continuously taking away heat.
8. The control system of crystallizer water of continuous casting machine according to claim 1, characterized in that: the crystallizer water outlet system comprises a temperature sensor II, a flow sensor and a water outlet pipeline.
9. The control method of the crystallizer water of the continuous casting machine based on the system of any one of claims 1 to 8 is characterized in that: setting a target set value Qi of the water inlet quantity of the crystallizer system, wherein the target set value Qi comprises a conventional set water quantity Qc and a disturbance water quantity Qt, and Qi is Qc + Qt;
The disturbed water quantity Qt is related to the conventional set water quantity Qc and changes along with time;
Disturbed water quantity Qt＝Asin(ωt)，A＝αQcwherein alpha is 1-10%, omega is pi-20 pi, and t is time unit s;
Disturbed water quantity Qt，
A＝αQcWherein alpha is 1-10%, t1，t2The value range of the time period is 5 s-20 s, T is the period, omega is pi-20 pi, and T is the time unit s;
When the water amount is set, the crystallizer with the disturbance amount is directly and dynamically adjusted through a flow regulating valve or is realized by independently setting a disturbance water amount water path.
10. the method for controlling water of a crystallizer of a continuous casting machine according to claim 9, wherein: the temperature sensor I transmits the measured temperature of the cooling water of the crystallizer to the programmable logic controller PLC, performs high-temperature alarm, and sends an alarm signal to the PLC when the temperature of the inlet water of the cooling water is higher than a certain temperature;
the temperature sensor II remotely transmits the measured temperature To the PLC system, performs temperature difference alarm, and transmits an alarm signal To the PLC system when the temperature difference To-Ti between the water temperature To of the crystallizer water outlet system and the water temperature Ti of the crystallizer water inlet system is greater than a certain value;
The flow sensor transmits a flow signal to the PLC system, and when the flow is larger than a set value and exceeds a certain limit, a high-flow alarm signal is transmitted to the PLC system; or when the flow is lower than a set value by a certain limit, transmitting a low-flow alarm signal to the PLC system.
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| CN201910920067.XA CN110576160B (en) | 2019-09-26 | 2019-09-26 | Control system and method for crystallizer water of continuous casting machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112317713A (en) * | 2020-11-04 | 2021-02-05 | 中冶赛迪重庆信息技术有限公司 | Continuous casting control method, system, medium and electronic terminal |
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| EP1103323A2 (en) * | 1999-11-29 | 2001-05-30 | SMS Demag AG | Process and device for continuous casting of steel |
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| CN112317713A (en) * | 2020-11-04 | 2021-02-05 | 中冶赛迪重庆信息技术有限公司 | Continuous casting control method, system, medium and electronic terminal |
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