A continuous casting machine secondary cooling water state early warning method and device

Abstract

The present application belongs to the technical field of slab continuous casting control in steel metallurgy, and discloses a method and device for early warning of the state of secondary cooling water of a continuous caster, which comprises collecting the set flow, actual flow and actual valve position of the regulating valve of each loop of the secondary cooling water of the continuous caster; analyzing and determining the state of the secondary cooling water of each loop through the set flow, actual flow and actual valve position of the regulating valve; and outputting early warning according to the state of the secondary cooling water of each loop. The present application monitors the set flow, actual flow, fluctuation rate of the actual flow and fluctuation rate of the actual valve position of each secondary cooling water loop, effectively realizes the monitoring and control of the state of the secondary cooling water, avoids quality accidents of slab cracks and even malignant accidents such as breakout, and achieves good economic and social benefits.

Description

Technical Field

[0001] This invention belongs to the field of slab continuous casting control technology in iron and steel metallurgy, and particularly relates to a method and device for early warning of the secondary cooling water status of a continuous casting machine. Background Technology

[0002] The secondary cooling water in a continuous casting machine serves to forcefully and uniformly cool the surface of the billet, allowing it to solidify in a shorter time. The secondary cooling zone must ensure the billet is free of surface and internal cracks, free of central segregation, and minimize the chance of leakage during casting. To avoid localized, drastic cooling that could cause cracks on the billet surface, the secondary cooling zone requires uniform cooling both longitudinally and laterally. Slab continuous casting machines typically have 10 secondary cooling zones, with a total of 16 secondary cooling water loops.

[0003] Secondary cooling control methods often employ the specific water flow method. Due to the simple linear relationship between water flow and casting speed, any fluctuation in casting speed will cause a change in water flow. Typically, only regulating valves are installed on the cooling water of the 16 loops to adjust the secondary cooling water flow, without effectively monitoring and controlling the actual flow rate fluctuations of the cooling water in these 16 loops or the actual valve position fluctuations of the regulating valves. When the cooling water flow in one, some, or all loops is abnormal (large fluctuations, low actual flow, or even zero flow), operators or process engineers may not detect it in time, and casting may continue. This can lead to quality problems such as billet cracks or even serious accidents like steel leakage due to the abnormal secondary cooling water.

[0004] Therefore, it is necessary to provide a method and device for early warning of the secondary cooling water status of a continuous casting machine, which can analyze and judge the set flow rate, actual flow rate, fluctuation rate of actual flow rate and fluctuation rate of actual valve position of each circuit in real time. Once an abnormality is detected, an early warning will be issued to avoid quality accidents such as billet cracks or even steel leakage caused by abnormal secondary cooling water. Summary of the Invention

[0005] In order to overcome the defects of the existing technology, the purpose of this invention is to provide a method and device for early warning of the secondary cooling water status of a continuous casting machine, which analyzes and judges the set flow rate, actual flow rate, fluctuation rate of actual flow rate and fluctuation rate of actual valve position of each circuit in real time. Once an abnormality is detected, an early warning is issued to avoid quality accidents such as billet cracking or even steel leakage caused by abnormal secondary cooling water.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A method for early warning of the secondary cooling water status of a continuous casting machine, comprising:

[0008] Collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine;

[0009] The secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve.

[0010] Early warnings are output based on the status of the secondary cooling water in each loop.

[0011] Furthermore, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0012] Preset minimum and maximum traffic limits;

[0013] When the set flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the secondary cooling water status of the current loop is determined to be abnormal, and an early warning command is issued.

[0014] Furthermore, the determination of the secondary cooling water status for each loop by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve also includes:

[0015] When the actual flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the secondary cooling water status of the current loop is determined to be abnormal, and an early warning command is issued.

[0016] Furthermore, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0017] Under constant-speed casting conditions, the actual flow rate fluctuation rate of each circuit is calculated by comparing the current actual flow rate with the actual flow rate at the previous moment. When the absolute value of the actual flow rate fluctuation rate is greater than 0.02 for a period of more than 10-15 seconds, the secondary cooling water status of the current circuit is determined to be abnormal, and an early warning command is issued.

[0018] Furthermore,

[0019] Where A is the actual flow fluctuation rate. 1 represents the current actual traffic. 0 represents the actual flow rate at the previous moment, t1 represents the current moment, and t0 represents the previous moment.

[0020] Furthermore, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0021] Under constant-speed casting conditions, the actual valve position fluctuation rate of each circuit is calculated by comparing the current actual valve position with the actual valve position at the previous moment. When the absolute value of the actual valve position fluctuation rate is greater than 0.02 for a period of more than 10-15 seconds, the secondary cooling water status of the current circuit is determined to be abnormal, and an early warning command is issued.

[0022] Furthermore,

[0023] Where B is the actual valve position fluctuation rate. 1 represents the current actual valve position. 0 represents the actual valve position at the previous moment, t1 represents the current moment, and t0 represents the previous moment.

[0024] Furthermore, based on the secondary cooling water status of each loop, an early warning is output, including:

[0025] When the secondary cooling water status of any loop is abnormal, an alarm message bar is issued on the human-machine interface, and the relevant alarm loop image is displayed on the screen while triggering an audible and visual alarm.

[0026] On the other hand, the present invention discloses a secondary cooling water status early warning device for a continuous casting machine, comprising:

[0027] The data acquisition module is used to collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine.

[0028] The analysis and judgment module is used to analyze and determine the secondary cooling water status of each loop by using the set flow rate, actual flow rate, and actual valve position of the regulating valve.

[0029] The early warning output module is used to output early warnings based on the status of the secondary cooling water in each loop.

[0030] Furthermore, the data acquisition module includes an electromagnetic flowmeter and a regulating valve with valve position feedback function;

[0031] The analysis and judgment module includes remote I / O, a programmable logic controller, a switch, and a first human-machine interface;

[0032] The early warning output module includes a screen, a second human-machine interface, and an audible and visual alarm.

[0033] The audible and visual alarm is connected to the remote I / O, and the screen and the second human-machine interface are connected to the analysis and judgment module via a switch.

[0034] The technical effects and advantages of this invention are as follows:

[0035] The continuous casting machine secondary cooling water status early warning method of the present invention includes collecting the set flow rate, actual flow rate and actual valve position of the regulating valve for each circuit of the continuous casting machine secondary cooling water; analyzing and determining the secondary cooling water status of each circuit through the set flow rate, actual flow rate and actual valve position of the regulating valve; and outputting an early warning based on the secondary cooling water status of each circuit.

[0036] This invention effectively monitors and controls the status of the secondary cooling water by monitoring the set flow rate, actual flow rate, actual flow rate fluctuation rate, and actual valve position fluctuation rate of each secondary cooling water circuit. This avoids quality accidents such as billet cracks or even serious accidents such as steel leakage, and achieves good economic and social benefits.

[0037] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0038] Figure 1 This is a flowchart of a method for early warning of the secondary cooling water status of a continuous casting machine according to the present invention;

[0039] Figure 2 This is a schematic diagram of a continuous casting machine secondary cooling water status early warning device according to the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, the present invention provides a method for early warning of the secondary cooling water status of a continuous casting machine, comprising:

[0042] Collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine;

[0043] The secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve.

[0044] Early warnings are output based on the status of the secondary cooling water in each loop.

[0045] In some embodiments of the present invention, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0046] Preset minimum and maximum traffic limits, for example, set the minimum traffic limit to 80% of normal operating traffic and the maximum traffic limit to 105% of normal operating traffic;

[0047] When the set flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the secondary cooling water status of the current loop is determined to be abnormal, and an early warning command is issued.

[0048] In some embodiments of the present invention, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, and further includes:

[0049] When the actual flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the secondary cooling water status of the current loop is determined to be abnormal, and an early warning command is issued.

[0050] In some embodiments of the present invention, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0051] Under constant-speed casting conditions, the actual flow rate fluctuation rate of each loop is calculated by comparing the current actual flow rate with the actual flow rate at the previous moment. The actual flow rate at the previous moment is the actual flow rate collected before the current actual flow rate is collected. The time interval between the two collections is adjusted according to the actual flow rate collection frequency required. For example, if the collection frequency is 1 time / s, the actual flow rate at the previous moment is the actual flow rate collected 1 second ago. When the absolute value of the fluctuation rate is greater than 0.02 for a period longer than 10-15 seconds, the secondary cooling water status of the current loop is determined to be abnormal, and an early warning command is issued.

[0052] In some embodiments of the present invention

[0053]

[0054] Where A is the actual flow fluctuation rate. 1 represents the current actual traffic. 0 represents the actual flow rate at the previous moment, t1 represents the current moment, and t0 represents the previous moment.

[0055] In some embodiments of the present invention, the secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve, including:

[0056] Under constant-speed casting conditions, the actual valve position fluctuation rate of each circuit is calculated by comparing the current actual valve position with the actual valve position at the previous moment. The actual valve position at the previous moment is the actual valve position acquired before the current actual valve position is acquired. The time interval between the two acquisitions is adjusted according to the actual valve position acquisition frequency required. For example, if the acquisition frequency is 1 time / s, the actual valve position at the previous moment is the actual valve position acquired 1 second ago. When the absolute value of the actual valve position fluctuation rate is greater than 0.02 for a period longer than 10-15s, the secondary cooling water status of the current circuit is determined to be abnormal, and an early warning command is issued.

[0057] In some embodiments of the present invention

[0058]

[0059] Where B is the actual valve position fluctuation rate. 1 represents the current actual valve position. 0 represents the actual valve position at the previous moment, t1 represents the current moment, and t0 represents the previous moment.

[0060] In some embodiments of the present invention, an early warning is output based on the secondary cooling water status of each loop, including:

[0061] When the secondary cooling water status of any loop is abnormal, an alarm message bar is issued on the human-machine interface, and the relevant alarm loop image is displayed on the screen while triggering an audible and visual alarm.

[0062] On the other hand, such as Figure 2 As shown, this invention discloses a secondary cooling water status early warning device for a continuous casting machine, comprising:

[0063] The data acquisition module is used to collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine.

[0064] The analysis and judgment module is used to analyze and determine the secondary cooling water status of each loop by using the set flow rate, actual flow rate, and actual valve position of the regulating valve.

[0065] The early warning output module is used to output early warnings based on the status of the secondary cooling water in each loop.

[0066] Optionally, the data acquisition module includes an electromagnetic flowmeter and a control valve with valve position feedback function;

[0067] The analysis and judgment module includes remote I / O, a programmable logic controller, a switch, and a first human-machine interface;

[0068] The early warning output module includes a screen, a second human-machine interface, and an audible and visual alarm.

[0069] The audible and visual alarm is connected to the remote I / O, and the screen and the second human-machine interface are connected to the analysis and judgment module via a switch.

[0070] To better illustrate this solution, the following embodiments are also provided:

[0071] The accessories of the continuous casting machine's secondary cooling water status early warning device are an electromagnetic flow meter with 4-20mA remote transmission function, a regulating valve with 4-20mA valve position feedback function, a Siemens S7-400PLC and its ET200M remote I / O programmable logic controller, and an alarm output device including a second human-machine interface, a screen and an audible and visual alarm.

[0072] Install relevant hardware when the continuous casting machine system is shut down for annual maintenance;

[0073] In a programmable logic controller (PLC), a secondary cooling water status early warning function control module FCB_Spray coolingwater is developed. Based on the flow regulation control program of each secondary cooling water control loop, the secondary cooling water function control module FCB_Spray cooling water is added. To minimize the amount of programming, modular programming is adopted, and relevant parameters are defined as temporary variables. The secondary cooling water status early warning function control program is edited into a function control module FCB_Spraycooling water to monitor and control the secondary cooling water status.

[0074] Start the secondary cooling water pump and perform simulation testing of the secondary cooling water status early warning function control program.

[0075] Production resumed after annual maintenance. The control parameters of the secondary cooling water status early warning function were tracked and optimized. The secondary cooling water status early warning function was put into formal operation only after it was fully normal.

[0076] This invention effectively monitors and controls the status of the secondary cooling water by monitoring the set flow rate, actual flow rate, actual flow rate fluctuation rate, and actual valve position fluctuation rate of each secondary cooling water circuit. This avoids quality accidents such as billet cracks or even serious accidents such as steel leakage, and achieves good economic and social benefits.

[0077] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for early warning of the secondary cooling water status of a continuous casting machine, characterized in that, include: Collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine; The secondary cooling water status of each loop is determined by analyzing the set flow rate, actual flow rate, and actual valve position of the regulating valve. Preset minimum and maximum traffic limits; When the set flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the current loop's secondary cooling water status is determined to be abnormal, and an early warning command is issued. When the actual flow rate of any one or more loops is less than the lower limit flow rate or greater than the upper limit flow rate, the current loop's secondary cooling water status is determined to be abnormal, and an early warning command is issued. Under constant-speed casting conditions, the actual flow rate fluctuation rate of each circuit is calculated by the current actual flow rate and the actual flow rate at the previous moment. When the absolute value of the actual flow rate fluctuation rate is greater than 0.02 for a period of more than 10-15 seconds, it is determined that the secondary cooling water status of the current circuit is abnormal and an early warning command is issued. Where A is the actual flow fluctuation rate. 1 represents the current actual traffic. 0 represents the actual flow rate at the previous moment, t1 represents the current moment, t0 represents the previous moment, and the sampling frequency is 1 time / s; Under constant speed casting conditions, the actual valve position fluctuation rate of each circuit is calculated by the current actual valve position and the actual valve position at the previous moment. When the absolute value of the actual valve position fluctuation rate is greater than 0.02 for a period of more than 10-15 seconds, it is determined that the secondary cooling water status of the current circuit is abnormal and an early warning command is issued. Where B is the actual valve position fluctuation rate. 1 represents the current actual valve position. 0 represents the actual valve position at the previous moment, t1 represents the current moment, t0 represents the previous moment, and the sampling frequency is 1 time / s; Early warnings are output based on the status of the secondary cooling water in each loop.

2. The method for early warning of the secondary cooling water status of a continuous casting machine according to claim 1, characterized in that, The aforementioned early warning output based on the secondary cooling water status of each loop includes: When the secondary cooling water status of any loop is abnormal, an alarm message bar is issued on the human-machine interface, and the relevant alarm loop image is displayed on the screen while triggering an audible and visual alarm.

3. A continuous casting machine secondary cooling water status early warning device, characterized in that... ,include: The data acquisition module is used to collect the set flow rate, actual flow rate, and actual valve position of the regulating valve for each circuit of the secondary cooling water of the continuous casting machine. The analysis and judgment module is used to analyze and determine the secondary cooling water status of each loop based on the set flow rate, actual flow rate, and actual valve position of the regulating valve. The early warning output module is used to output early warnings based on the status of the secondary cooling water in each loop.

4. The continuous casting machine secondary cooling water status early warning device according to claim 3, characterized in that, The data acquisition module includes an electromagnetic flowmeter and a regulating valve with valve position feedback function; The analysis and judgment module includes remote I / O, a programmable logic controller, a switch, and a first human-machine interface; The early warning output module includes a screen, a second human-machine interface, and an audible and visual alarm. The audible and visual alarm is connected to the remote I / O, and the screen and the second human-machine interface are connected to the analysis and judgment module through the switch.

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