Efficient energy-saving automatic control method for laminar cooling water system

Abstract

The invention discloses an efficient energy-saving automatic control method for a laminar cooling water system, and belongs to the field of cooling water control. The method comprises the steps that after rolling of a finishing mill is completed, an image of a steel plate starts to be tracked, after the head of the steel plate is gripped in through a pre-straightening machine and detected through a grating SMS4 behind the pre-straightening machine, image and real object correction synchronization is conducted, then it is sequentially judged that the steel plate enters an A / B / C / D section, control instructions are sent out, and segmented water cut-off is conducted in order. The steel plates in the frame are transported in the logistics direction to be cooled, the system accurately positions the tails of the steel plates, a closing instruction is sent every time the steel plates reach a set position, header water of the previous section is closed, the segmented water cut-off function is achieved, a large amount of waste of cooling water is effectively avoided, water is supplied by a pump motor, loss of electric energy is reduced, and the service life of the system is prolonged. And good effects of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The invention relates to cooling water control, and in particular to an efficient energy-saving automatic control method for a laminar cooling water system. Background Art

[0002] Zhanjiang thick plate MULPIC (MULti-Purpose Interrupted cooling) post-rolling cooling system is one of the newest and most advanced post-rolling cooling systems in the world. This system has the characteristics of high cooling rate, good water uniformity and flow control accuracy, and flexible and diverse cooling modes. MULPIC has a higher cooling rate and better cooling effect than traditional laminar cooling systems, which brings finer grains and better crystal phase control, which is more conducive to reducing steel plate production costs and alloy composition.

[0003] Zhanjiang thick plate MULPIC is 24 meters long and divided into four sections: A / B / C / D. Each section contains 6 pairs of cooling headers, with a spacing of 1 meter. There are 48 headers in total, of which A and B sections are for high and low pressure, and C and D sections are for low pressure. It is divided into rapid cooling and direct quenching. The cooling system is divided into two parts: direct quenching jet cooling section (DQ, direct quenching) and laminar accelerated cooling section (ACC, accelerated cooling).

[0004] Combination Figure 1 Simple diagram of post-rolling cooling equipment and Figure 2 The original water shut-off sequence for post-rolling cooling is briefly described as follows: the original control sequence for manifold cooling and watering is that after the online cooling steel plate is rolled through the finishing mill, the steel plate establishes image tracking, and the A / B / C / D four-section manifolds open water to stabilize the water flow. After the steel plate is pre-straightened and straightened, the SMS4 grating behind the machine is corrected and synchronized. The head of the steel plate begins to enter the first manifold in section A for cooling. The system tracks the position of the steel plate throughout the spraying operation until the tail of the steel plate completely leaves the last manifold in section D. At this time, the system controls the A / B / C / D four-section cooling water to shut off, and the steel plate completes the process of grain refinement and organizational phase change.

[0005] The cooled steel plate is transported in the direction of logistics for cooling. When the tail of the steel plate leaves each section, the water in the header of this section is still spraying. As a result, a large amount of cooling water is wasted, which invisibly increases the processing cost of the steel plate. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to provide an efficient energy-saving automatic control method for a laminar cooling water system.

[0007] Technical solution: An efficient energy-saving automatic control method for a laminar cooling water system, comprising the following steps:

[0008] S1. After the finishing mill is finished, the image of the steel plate is tracked. When the head of the steel plate is bitten into the pre-straightening machine and detected by the grating SMS4 after the pre-straightening machine, the image and the physical object are corrected synchronously;

[0009] S2. According to the determined parameters, the tail of the steel plate is calculated through integration. After reaching the first header B1 of the safe position of the B section, the system determines that the tail of the steel plate has left the header of the A section. The program automatically calculates and issues the FLOW OFF1# instruction to close all the upper and lower headers of the A section. At this time, the regulating valve is closed;

[0010] S3, continue to track the tail of the steel plate, leave the B section header, and reach the first header C1 of the C section at the safe position. It is determined that the tail of the steel plate leaves the B section header, and the program automatically calculates and issues the FLOW OFF2# instruction to close all the upper and lower headers of the B section;

[0011] S4, continue to track the tail of the steel plate, leave the C section header, and after reaching the first header D1 of the D section at the safe position, determine that the tail of the steel plate leaves the C section header, automatically calculate and issue the FLOW OFF3# instruction, and close all the upper and lower headers of the C section;

[0012] S5. Track the tail of the steel plate until it completely leaves section D. The program automatically calculates and issues the FLOWOFF4# instruction to shut off all header water in section D and cut off water in sections in an orderly manner.

[0013] Preferably, in step S1, the length of the steel plate after rolling is constant, the head position of the steel plate has been confirmed after correction synchronization, and the tail position of the current steel plate can be confirmed after calculation.

[0014] Preferably, in step S2, the determined parameters include the physical location of the water tank and the cooling speed.

[0015] Beneficial effects: The steel plates in the frame are transported in the direction of logistics for cooling. The system accurately locates the tail of the steel plate. Every time it reaches the set position, it sends a closing command to shut down the water in the upper section of the header, realizing the segmented water cut-off function and effectively avoiding a large amount of waste of cooling water. The water is supplied by the pump motor, which reduces the loss of electric energy and achieves a good effect of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the working principle of the original post-rolling cooling equipment;

[0017] Figure 2 This is the timing diagram for shutting down the cooling water of the original post-rolling cooling equipment;

[0018] Figure 3 This is a timing diagram of closing cooling water for the post-rolling cooling equipment of the present invention;

[0019] Figure 4 This is the cooling water shut-off condition of the header before use in Example 1;

[0020] Figure 5 This is the cooling water shut-off condition of the header after use in Example 2. DETAILED DESCRIPTION

[0021] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 3 As shown, after the head of the steel plate is bitten into the pre-straightening machine and detected by the grating SMS4 after the pre-straightening machine, the image and the real object are first corrected synchronously. The physical position of the grating is constant. The system receives the length of the steel plate sent by L2 and can confirm the tail position of the current steel plate after calculation. The physical position of the water tank is confirmed, and the cooling speed is confirmed. Through integral calculation, it is determined that the tail of the steel plate has left the A-section header and arrived at the first header B1 of the safe section B. The system automatically issues the FLOW OFF1# instruction to close all the upper and lower headers of the A section, and the regulating valve is closed at this time; the system continues to track the tail of the steel plate, leaves the B-section header, and arrives at the first header C1 of the safe section C. The system automatically issues the FLOW OFF2# instruction to close all the upper and lower headers of the B section; the program continues to track the tail of the steel plate, leaves the C-section header, and arrives at the first header D1 of the safe section D. The system automatically issues the FLOWOFF3# instruction to close all the upper and lower headers of the C section; the calculation and tracking of the tail of the steel plate continues until the tail of the steel plate completely leaves the D section, and the FLOW OFF4# instruction is issued to close all the header water of the D section, and the water is cut off in sections in an orderly manner.

[0023] Example 1

[0024] Figure 4 Taking section A as an example, after the online cooled steel plate is rolled through the finishing mill, image tracking is established for the steel plate, and the water flow rate of the four-section headers A / B / C / D is stabilized. After the SMS4 grating correction synchronization after the pre-straightening machine, the head of the steel plate begins to enter the first header of section A for cooling. The system tracks the position of the steel plate throughout the spraying operation until the tail completely leaves the last header of section D. The entire spraying operation time of the current steel plate is 79s, and the cooling speed of the steel plate is 0.54m / s. The operation result is that after the tail of the steel plate leaves section A, the header water of section A is still spraying for 37s, and a large amount of cooling water is wasted at this time.

[0025] Example 2

[0026] After adopting this method, taking section A as an example, the timing of controlling the closing of cooling water is as follows: Figure 5 As shown in the figure, after the tail of the steel plate leaves the A section header and reaches the first header B1 of the B section at the safe position, the system determines that the tail of the steel plate leaves the A section header, and the program automatically calculates and issues the FLOW OFF1# instruction to close all the upper and lower headers of the A section. The entire spraying operation time of the current steel plate is 56s, and the cooling speed of the steel plate is 0.76m / s. After optimization, after the tail of the steel plate leaves the A section header, the cooling water of the A section is closed, which can reduce the waste of cooling water by about 27s.

[0027] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An efficient energy-saving automatic control method for a laminar cooling water system, characterized in that: The following steps are involved: S1. After the finishing mill is finished, the image of the steel plate is tracked. When the head of the steel plate is bitten into the pre-straightening machine and detected by the grating SMS4 after the pre-straightening machine, the image and the physical object are corrected synchronously; S2. According to the determined parameters, the tail of the steel plate is calculated through integration. After reaching the first header B1 of the safe position of the B section, the system determines that the tail of the steel plate has left the header of the A section. The program automatically calculates and issues the FLOW OFF1# instruction to close all the upper and lower headers of the A section. At this time, the regulating valve is closed; S3, continue to track the tail of the steel plate, leave the B section header, and reach the first header C1 of the C section at the safe position. It is determined that the tail of the steel plate leaves the B section header, and the program automatically calculates and issues the FLOW OFF2# instruction to close all the upper and lower headers of the B section; S4, continue to track the tail of the steel plate, leave the C section header, and after reaching the first header D1 of the D section at the safe position, determine that the tail of the steel plate leaves the C section header, automatically calculate and issue the FLOW OFF3# instruction, and close all the upper and lower headers of the C section; S5. Track the tail of the steel plate until it completely leaves section D. The program automatically calculates and issues the FLOW OFF4# instruction to shut off all header water in section D and cut off water supply in sections in an orderly manner.

2. The efficient energy-saving automatic control method for laminar cooling water system according to claim 1 is characterized in that: In step S1, the length of the steel plate after rolling is constant, and the head position of the steel plate has been confirmed after correction synchronization, and the tail position of the current steel plate can be confirmed after calculation.

3. The efficient energy-saving automatic control method for a laminar cooling water system according to claim 1 is characterized in that: In step S2, the parameters determined include the physical location of the water tank and the cooling speed.

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