Rolling rhythm self-adaptive energy-saving method for hot rolling descaling system
By using a computer control system to adaptively adjust the flow rate and power of the descaling system on the hot rolling production line, the problems of excessive performance and pressure fluctuations in the descaling system were solved, achieving energy saving, consumption reduction, and improved production efficiency.
Patent Information
- Application Number
- CN202411141611.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2026-03-03
AI Technical Summary
The existing hot rolling production line descaling system has problems of overperformance and abnormal pressure fluctuations, which leads to increased energy consumption and increased production labor load.
The computer control system pre-calculates the flow demand and pressure fluctuations of the descaling system at each location on the hot rolling production line, and automatically controls the start-up, shutdown, and operating power of the descaling pump and accumulator, so that the operating power of the descaling system adapts to the production rhythm.
This achieves low-cost and efficient reduction of energy consumption in hot rolling production lines and optimization of resource utilization efficiency without affecting product quality.
Smart Images
Figure CN121589136A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to hot rolling descaling technology, and more specifically, to an energy-saving method for a hot rolling descaling system with adaptive rolling rhythm. Background Technology
[0002] The descaling system is a crucial component of a hot rolling production line. Its primary function is to remove the oxide layer that forms on the surface of the strip during hot rolling, thereby obtaining hot-rolled steel coils with excellent surface quality. Descaling locations on a hot rolling line are typically categorized as follows: Descaling box #1 (removes the furnace-grown oxide layer from the strip), the inlet or outlet of each mill in the roughing rolling area, Descaling box #2 (removes the oxide layer generated during the roughing rolling process), and the finishing rolling area. During normal production, the computer system controls the opening and closing sequence of each descaling location based on the positional changes of the strip's virtual image. The basic principle is to activate the descaling water before the strip head reaches the descaling point and deactivate it after the strip tail has completely moved away, ensuring uniform descaling along the entire length of the strip. The main parameters for evaluating the performance of the hot rolling production line's descaling system are the stability of the system pressure and the system's energy consumption.
[0003] For a long time, cost reduction and efficiency improvement have been the main themes of the development of hot rolling production lines. To this end, the steel industry has undertaken a series of measures to improve energy efficiency in descaling systems, such as adding accumulators. A review of relevant data reveals that current energy-saving improvements to descaling systems in hot rolling production lines mainly focus on the investment in new equipment. The purchase and subsequent maintenance of new equipment will still incur significant expenses. Furthermore, to ensure constant descaling pressure during normal production, the descaling pumps in hot rolling production lines are always running, leading to a degree of over-performance. Simultaneously, in hot rolling production lines using accumulators, the reduction in descaling pumps can easily lead to insufficient water supply under extreme production rhythms, requiring manual control of the pumps' on / off states at different production rhythms, increasing the labor load on frontline production workers.
[0004] In summary, given the current problems of excessive performance and abnormal pressure fluctuations in hot rolling descaling systems, developing an energy-saving method for hot rolling descaling systems with adaptive rolling rhythm is of great significance. Summary of the Invention
[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide an energy-saving method for a hot rolling descaling system with adaptive rolling rhythm. This method addresses the deficiencies in current energy-saving efforts of hot rolling production line descaling systems, achieving energy conservation and consumption reduction in the descaling system at low cost and high efficiency without affecting product quality.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] An energy-saving method for a hot rolling descaling system with adaptive rolling rhythm:
[0008] Based on the speed diagram of the hot rolling production line, the actual information of the rolled strip steel, and the descaling process requirements of the strip steel, the flow demand and pressure fluctuation of the descaling system at each location on the hot rolling production line are pre-calculated by the computer control system. This is then compared with the existing water supply capacity of the descaling system, and the start-up, shutdown, and operating power of the descaling pump and accumulator in the descaling system are automatically controlled to achieve the adaptive adaptation of the operating power of the descaling system to the production rhythm of the hot rolling production line.
[0009] Preferably, the energy-saving method for the hot rolling descaling system specifically includes the following steps:
[0010] S1, calculate the descaling requirement;
[0011] S2, Calculate the supply capacity of the descaling system;
[0012] S3, compare the descaling demand with the supply capacity of the descaling system, and adjust the power.
[0013] Preferably, step S1 specifically includes:
[0014] The computer control system calculates the time it takes for each strip on the hot rolling production line to reach the next descaling point and the duration of descaling, based on the speed diagram, the actual information of the rolled strip, and the descaling process requirements of the strip.
[0015] Preferably, step S2 specifically includes:
[0016] The computer control system calculates the supply capacity of the descaling system when the high-pressure descaling water jet valve is opened once the production line is connected, based on the available liquid level in the descaling water tank and the current water supply capacity of the descaling system.
[0017] Preferably, step S3 specifically includes:
[0018] The computer control system makes the following comparison and judgment based on the calculation results of step S1 and step S2:
[0019] If the current operating power of the descaling system is less than the power required for the next descaling operation, the computer control system issues a command to increase the power of the descaling system to meet the descaling power requirement.
[0020] If the current operating power of the descaling system is greater than the power required for the next descaling operation, the computer control system issues a command to reduce the power of the descaling system.
[0021] If the current operating power of the descaling system is within the deviation range compared to the power required for the next descaling cycle, the computer control system will not issue any instructions, i.e., it will maintain the current power level.
[0022] Preferably, the speed diagram includes one or more of the following: the steel extraction speed of the heating furnace on the hot rolling production line, the conveying speed and acceleration of the roller conveyors in each area, the rolling speed and acceleration of each stand, and the descaling speed and acceleration of each descaling point.
[0023] Preferably, the actual information of the rolled strip includes one or more of the following: initial slab thickness, initial slab width, initial slab length, target strip thickness, target strip width, and theoretically calculated strip length.
[0024] Preferably, the descaling process requirements for the strip include one or more of the following: descaling speed at each descaling point, descaling delay start time, and number of descaling water groups used.
[0025] Preferably, the calculation of the descaling requirement is as follows:
[0026] The running speeds v1, v2, ..., v of each strip on the hot rolling production line are obtained from the speed diagram. n ;
[0027] Based on the descaling process requirements of the strip steel, the distances s1, s2, ..., s of each strip steel on the hot rolling production line from the next descaling position are obtained. n ;
[0028] Therefore, the time t1, t2, ..., t for each strip steel on the hot rolling production line to reach the next descaling point can be calculated. n ;
[0029] n is the number of strips on the hot rolling line;
[0030] The water consumption for normal descaling at each descaling point is w1, w2, ..., w n Let n be the total number of descaling points on the hot rolling production line, and at the current time t0, the descaling water consumption on the hot rolling production line is W0 = w j +w j+1 +,……,+w j+k Let j≥1, j+k≤n, and the change W of descaling water consumption on the hot rolling production line at any future time t. 变 This is the sum of the opening and closing times of the descaling water on the hot rolling production line from the current time to time t;
[0031] At any future time t, the descaling water consumption W on the hot rolling production line t =W0+W 变 .
[0032] Preferably, the supply capacity of the descaling system is calculated as follows:
[0033] Under the pressure conditions required to meet the descaling requirements of the hot rolling production line, the water supply of the descaling pump is between W min To W max scope;
[0034] Therefore, the maximum water supply W is calculated. 供给max =W 1max +W 2max +...+W nmax , where n is the number of descaling pumps that are already in operation.
[0035] Preferably, the available liquid level of the descaling tank is the difference between the real-time liquid level of the descaling tank and the alarm liquid level.
[0036] Preferably, the water supply capacity of the descaling system is determined by the sum of the maximum water supply of each descaling pump in normal operation, provided that the output pressure is within the allowable fluctuation range, with an output pressure of 15MPa to 40MPa.
[0037] Preferably, the command issued by the computer control system to increase the power of the descaling system includes at least one of turning on x descaling pumps or increasing the speed of the descaling pumps.
[0038] The computer control system issued a power reduction command for the descaling system, which includes at least one of shutting down x descaling pumps or increasing the speed of the descaling pumps.
[0039] x = 1, 2, 3, ..., n
[0040] The deviation range is between -10% and 10%.
[0041] The present invention provides an energy-saving method for a hot rolling descaling system that adapts to the rolling rhythm. When the hot rolling production line has a fast rhythm, the total power of the descaling system can be automatically increased, and when the rhythm is slowed down, the total power of the descaling system can be automatically reduced, thereby maximizing resource utilization efficiency and reducing energy consumption of the hot rolling production line. Attached Figure Description
[0042] Figure 1 This is a schematic flowchart of the energy-saving method for the hot rolling descaling system of the present invention;
[0043] Figure 2 This is a schematic diagram showing the power changes of the existing hot rolling production line descaling system and the hot rolling production line descaling system after adopting the energy-saving method of the present invention. Detailed Implementation
[0044] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0045] This invention provides an energy-saving method for a hot rolling descaling system with adaptive rolling rhythm:
[0046] Based on the speed diagram of the hot rolling production line, the actual information of the rolled strip steel, and the descaling process requirements of the strip steel, the flow demand and pressure fluctuation of the descaling system at each location on the hot rolling production line are pre-calculated by the computer control system and compared with the existing water supply capacity of the descaling system. Then, the start-up, shutdown and operating power of the descaling pump and accumulator in the descaling system are automatically controlled to achieve the adaptive adaptation of the operating power of the descaling system to the production rhythm of the hot rolling production line.
[0047] Combination Figure 1 As shown, the energy-saving method of the hot rolling descaling system of the present invention specifically includes the following steps:
[0048] S1, Calculate the descaling requirement.
[0049] The computer control system calculates the time it takes for each strip on the hot rolling production line to reach the next descaling point and the duration of descaling by using speed diagrams, actual information on the rolled strip, and the descaling process requirements.
[0050] S2, Calculate the supply capacity of the descaling system.
[0051] The computer control system calculates the supply capacity of the descaling system when the high-pressure descaling water jet valve is opened on the production line, based on the available liquid level in the descaling water tank and the current water supply capacity of the descaling system.
[0052] S3 compares the descaling demand with the descaling system's supply capacity and adjusts the power accordingly.
[0053] The computer control system makes the following comparison and judgment based on the calculation results of steps S1 and S2:
[0054] If the current operating power of the descaling system is less than the power required for the next descaling cycle, the computer control system will issue a command to increase the power of the descaling system to meet the descaling power requirement.
[0055] If the current operating power of the descaling system is greater than the power required for the next descaling cycle, the computer control system will issue a command to reduce the power of the descaling system.
[0056] If the current operating power of the descaling system is within the deviation range compared to the power required for the next descaling cycle, the computer control system will not issue any instructions, that is, maintain the current power unchanged.
[0057] In step S1 above, the speed diagram includes one or more of the following: the steel drawing speed of the heating furnace on the hot rolling production line, the conveying speed and acceleration of the roller conveyor in each area, the rolling speed and acceleration of each stand, and the descaling speed and acceleration of each descaling point.
[0058] In step S1 above, the actual information of the rolled strip includes one or more of the following: initial slab thickness, initial slab width, initial slab length, target strip thickness, target strip width, and theoretically calculated strip length.
[0059] In step S1 above, the descaling process requirements for the strip include one or more of the following: descaling speed at each descaling point, descaling delay start time, and number of descaling water groups used.
[0060] In step S1 above, the calculation of the descaling requirement further includes:
[0061] The running speeds v1, v2, ..., v of each strip on the hot rolling production line are obtained from the speed diagram. n ;
[0062] Further, based on the descaling process requirements of the strip steel, the distances s1, s2, ..., s of each strip steel on the hot rolling production line to the next descaling position are obtained. n ;
[0063] Therefore, the time t1, t2, ..., t for each strip of steel on the hot rolling production line to reach the next descaling point can be calculated. n ;
[0064] In the above, n represents the number of strips on the hot rolling line.
[0065] The water consumption for normal descaling at each descaling point is w1, w2, ..., w n (The relevant parameters are the basic parameters of the descaling system, and n is the total number of descaling points on the production line). At the current time t0, the descaling water consumption on the hot rolling production line is W0 = w j +w j+1 +,……,+w j+k (j≥1, j+k≤n), the change W of descaling water consumption on the hot rolling production line at any future time t. 变 This is the sum of the opening and closing times of the descaling water on the hot rolling production line from the current time to time t.
[0066] At any future time t, the descaling water consumption W on the hot rolling production line t =W0+W 变 .
[0067] In step S2 above, the calculation of the supply capacity of the descaling system is as follows:
[0068] Under the pressure conditions required to meet the descaling requirements of the hot rolling production line, the water supply of the descaling pump is between W... min To W max scope;
[0069] The relevant parameters are determined by the design parameters of the descaling pump, from which the maximum water supply W can be calculated.供给max =W 1max +W 2max +...+W nmax (n is the number of descaling pumps that are already in operation).
[0070] In step S2 above, the available liquid level of the descaling tank is the difference between the real-time liquid level of the descaling tank and the alarm liquid level.
[0071] In step S2 above, the current water supply capacity of the descaling system is determined by the sum of the maximum water supply of each descaling pump in normal operation under the condition that the output pressure is within the allowable fluctuation range, and the output pressure is 15MPa to 40MPa.
[0072] In step S3 above, the command issued by the computer control system to increase the power of the descaling system includes at least one of turning on x descaling pumps or increasing the speed of the descaling pumps.
[0073] In step S3 above, the command issued by the computer control system to reduce the power of the descaling system includes at least one of shutting down x descaling pumps or increasing the speed of the descaling pumps.
[0074] x = 1, 2, 3, ..., n
[0075] The deviation between the current operating power of the descaling system and the power required for the next descaling operation is between -10% and 10%.
[0076] Combination Figure 2 As shown, the usual practice for the descaling system power in current hot rolling production lines is to keep it in a constantly open state, i.e., the maximum power operation mode. The energy-saving method for hot rolling descaling system with adaptive rolling rhythm of the present invention makes the operating power of the descaling system close to the demand power, reduces the performance overflow, and achieves the purpose of energy saving.
[0077] Example 1
[0078] The normal descaling water consumption at each descaling point on a certain hot rolling production line is 200m³. 3 / h, each descaling pump has an output flow rate of 180m³ / h while maintaining the required pressure. 3 / h-220m 3 At a certain moment, four strips of steel, numbered 001-004, are being produced on the production line. Three descaling pumps are operating, and the maximum water supply of the descaling system is 660 m³ / h. 3 / h, the current descaling water output of the production line is 400m³ / h. 3 Based on the speed of each strip, the system calculates that the maximum descaling water consumption after 20 seconds is 800 m³ / h. 3 / h exceeds the current system's maximum water supply, therefore a command to start the descaling pump is issued.
[0079] Example 2
[0080] The normal descaling water consumption at each descaling point on a certain hot rolling production line is 200m³. 3 / h, each descaling pump has an output flow rate of 180m³ / h while maintaining the required pressure. 3 / h-220m 3 At a certain moment, four strips of steel, numbered 001-004, are being produced on the production line. Four descaling pumps are operating, and the maximum water supply of the descaling system is 880 m³ / h. 3 / h, the current descaling water output of the production line is 800m³ / h. 3 Based on the speed of each strip, the system calculates that the maximum descaling water consumption after 15 seconds is 600 m³ / h. 3 The flow rate is less than the current system's maximum water supply, therefore an instruction to shut down the descaling pump is issued.
[0081] Example 3
[0082] The normal descaling water consumption at each descaling point on a certain hot rolling production line is 200m³. 3 / h, each descaling pump has an output flow rate of 180m³ / h while maintaining the required pressure. 3 / h-220m 3 At a certain moment, three strips of steel, numbered 001-003, are being produced on the production line. Three descaling pumps are operating, and the maximum water supply of the descaling system is 660 m³ / h. 3 / h, the current descaling water output of the production line is 200m³ / h. 3 Based on the speed of each strip, the system calculates that the maximum descaling water consumption after 10 seconds is 600 m³ / h. 3 / h, the current system's maximum water supply has not been reached, so an instruction to maintain the current level is issued.
[0083] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.
Claims
1. An energy-saving method for a hot rolling descaling system with adaptive rolling rhythm, characterized in that: Based on the speed diagram of the hot rolling production line, the actual information of the rolled strip steel, and the descaling process requirements of the strip steel, the flow demand and pressure fluctuation of the descaling system at each location on the hot rolling production line are pre-calculated by the computer control system. This is then compared with the existing water supply capacity of the descaling system, and the start-up, shutdown, and operating power of the descaling pump and accumulator in the descaling system are automatically controlled to achieve the adaptive adaptation of the operating power of the descaling system to the production rhythm of the hot rolling production line.
2. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 1, characterized in that, The energy-saving method of the hot rolling descaling system is specifically... Includes the following steps: S1, calculate the descaling requirement; S2, Calculate the supply capacity of the descaling system; S3, compare the descaling demand with the supply capacity of the descaling system, and adjust the power.
3. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 2, characterized in that, Step S1 specifically includes: The computer control system calculates the time it takes for each strip on the hot rolling production line to reach the next descaling point and the duration of descaling, based on the speed diagram, the actual information of the rolled strip, and the descaling process requirements of the strip.
4. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 3, characterized in that, Step S2 specifically includes: The computer control system calculates the supply capacity of the descaling system when the high-pressure descaling water jet valve is opened once the production line is connected, based on the available liquid level in the descaling water tank and the current water supply capacity of the descaling system.
5. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 4, characterized in that, Step S3 specifically includes: The computer control system makes the following comparison and judgment based on the calculation results of step S1 and step S2: If the current operating power of the descaling system is less than the power required for the next descaling operation, the computer control system issues a command to increase the power of the descaling system to meet the descaling power requirement. If the current operating power of the descaling system is greater than the power required for the next descaling operation, the computer control system issues a command to reduce the power of the descaling system. If the current operating power of the descaling system is within the deviation range compared to the power required for the next descaling cycle, the computer control system will not issue any instructions, i.e., it will maintain the current power level.
6. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 3, characterized in that: The speed diagram includes one or more of the following: the steel extraction speed of the heating furnace on the hot rolling production line, the conveying speed and acceleration of the roller conveyors in each area, the rolling speed and acceleration of each stand, and the descaling speed and acceleration of each descaling point.
7. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 3, characterized in that: The actual information of the rolled strip includes one or more of the following: initial slab thickness, initial slab width, initial slab length, target strip thickness, target strip width, and theoretically calculated strip length.
8. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 3, characterized in that: The descaling process requirements for the strip steel include one or more of the following: descaling speed at each descaling point, descaling delay start time, and number of descaling water groups used.
9. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 3, characterized in that, The calculation of the descaling requirement further includes: The running speeds v1, v2, ..., v of each strip on the hot rolling production line are obtained from the speed diagram. n ; Based on the descaling process requirements of the strip steel, the distances s1, s2, ..., s of each strip steel on the hot rolling production line from the next descaling position are obtained. n ; Therefore, the time t1, t2, ..., t for each strip steel on the hot rolling production line to reach the next descaling point can be calculated. n ; n is the number of strips on the hot rolling line; The water consumption for normal descaling at each descaling point is w1, w2, ..., w n Let n be the total number of descaling points on the hot rolling production line, and at the current time t0, the descaling water consumption on the hot rolling production line is W0 = w j +w j+1 +,……,+w j+k Let j≥1, j+k≤n, and the change W of descaling water consumption on the hot rolling production line at any future time t. 变 This is the sum of the opening and closing times of the descaling water on the hot rolling production line from the current time to time t; At any future time t, the descaling water consumption W on the hot rolling production line t =W0+W 变 .
10. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 9, characterized in that, The calculation of the supply capacity of the descaling system is as follows: Under the pressure conditions required to meet the descaling requirements of the hot rolling production line, the water supply of the descaling pump is between W min To W max scope; Therefore, the maximum water supply W is calculated. 供给max =W 1max +W 2max +...+W nmax , where n is the number of descaling pumps that are already in operation.
11. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 5, characterized in that: The available liquid level in the descaling tank is the difference between the real-time liquid level and the alarm liquid level in the descaling tank.
12. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 5, characterized in that: The water supply capacity of the descaling system is determined by the sum of the maximum water supply of each descaling pump in normal operation, under the condition that the output pressure is within the allowable fluctuation range, with an output pressure of 15MPa to 40MPa.
13. The energy-saving method for a hot rolling descaling system with adaptive rolling rhythm according to claim 5, characterized in that: The computer control system sends a power-increasing command to the descaling system, which includes at least one of turning on x descaling pumps or increasing the speed of the descaling pumps. The computer control system issued a power reduction command for the descaling system, which includes at least one of shutting down x descaling pumps or increasing the speed of the descaling pumps. x = 1, 2, 3, ..., n The deviation range is between -10% and 10%.