CN111715711B - Efficient descaling control method for hot-rolled strip production line - Google Patents
Efficient descaling control method for hot-rolled strip production line Download PDFInfo
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- CN111715711B CN111715711B CN202010374511.5A CN202010374511A CN111715711B CN 111715711 B CN111715711 B CN 111715711B CN 202010374511 A CN202010374511 A CN 202010374511A CN 111715711 B CN111715711 B CN 111715711B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B2037/002—Mass flow control
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Abstract
The invention relates to a high-efficiency descaling control method for a hot-rolled strip production line, and belongs to the technical field of hot rolling in the metallurgical industry. The technical scheme is as follows: a system pressure sensor signal, a finish rolling energy accumulator liquid level switch signal and a finish rolling minimum liquid level valve electromagnetic valve signal on a finish rolling energy accumulator pipeline are connected into a furnace and rough rolling descaling PLC control system, and the signals are completely disconnected with the finish rolling descaling PLC control system; and then adding program sections in the PLC control system program for controlling the liquid level and the lowest liquid level valve of the finish rolling energy accumulator after the furnace and the rough rolling descaling, and using the system pressure of the finish rolling energy accumulator in the program sections for controlling the speed increase and decrease of the rough rolling descaling pump after the furnace. The invention has the beneficial effects that: through the transformation of the finish rolling descaling equipment, the use efficiency and the stability of a dephosphorization system are improved, the descaling impact force is improved, the descaling effect is improved, the surface quality of a product is improved, and a solid foundation is laid for producing high-surface product quality varieties.
Description
Technical Field
The invention relates to a high-efficiency descaling control method for a hot-rolled strip production line, and belongs to the technical field of hot rolling in the metallurgical industry.
Background
As is well known, the general conventional slab hot rolling strip steel production line aims at high productivity, high efficiency, high product grade and high variety proportion. The 1700mm line is a conventional hot-rolled plate strip production line of a medium plate blank, the technology is automatically integrated, production line equipment and automatic control level are low when the production line is put into operation in the early 2005, partial basic automation facilities are incomplete, the product grade is not high, the production line efficiency is low, a descaling system of the 1700mm medium plate blank production line is designed and installed as a heavy pump, and the whole line has two sets of descaling systems: after the furnace, a set of water pumps for rough rolling and descaling is arranged, a set of water pumps for finish rolling and descaling is arranged, and a set of water pumps for 2# is arranged, and the pressure of the water pumps is 18.5-19.5 MPa. The design of descaling after the furnace and rough rolling has defects, so that the time for descaling at two points of after the furnace and rough rolling is short (generally about 5S), the hourly output is less than 400 tons/day, and the descaling device is in the middle and lower level of domestic similar production lines. The finish rolling descaling adopts double-pump double-beam, but because of the low system pressure, the hitting power is insufficient, the descaling effect is poor, and the surface quality is seriously influenced. And the production line is short in production and the equipment has more defects.
Disclosure of Invention
The invention aims to provide a high-efficiency descaling control method for a hot-rolled strip production line, which improves the productivity of a rolling line by more than 800 tons/day through the work of equipment transformation, program optimization and the like of a 1700mm line furnace rear and rough rolling descaling system and a finish rolling descaling system; meanwhile, through the transformation of the finish rolling descaling equipment, the descaling impact force is improved, the descaling effect is improved, the surface quality of the product is improved, a solid foundation is laid for producing high-surface product quality varieties, and the problems in the background art are effectively solved.
The technical scheme of the invention is as follows: a high-efficiency descaling control method for a hot-rolled strip production line comprises the following steps:
(1) the hot rolled plate strip production line is 1700mm medium plate blank production lines and is provided with two sets of descaling systems:
a furnace rear and rough rolling descaling system: two descaling pumps (one for one), a descaler (one for a descaling water beam), a rough rolling descaler (one for a water beam) and a rough rolling descaling PLC control system;
finish rolling descaling system: a finish rolling descaling pump (using two to prepare one), a finish rolling descaling machine (using two for a water beam) and a finish rolling descaling PLC control system.
Actually accessing a system pressure sensor signal, a finish rolling energy accumulator liquid level switch signal and a finish rolling minimum liquid level valve electromagnetic valve signal on a finish rolling energy accumulator pipeline into a furnace and a rough rolling descaling PLC control system on site, and completely disconnecting the signals from the finish rolling descaling PLC control system; the adding module modifies the hardware configuration of the PLC control system after the furnace and the rough rolling descaling system, then adds a program section to control the liquid level and the lowest liquid level valve of the finish rolling energy accumulator in the PLC control system program after the furnace and the rough rolling descaling system, uses the system pressure of the finish rolling energy accumulator in the control program section of the speed increase and decrease of the pump in the system after the furnace and the rough rolling descaling system, and completely replaces the corresponding position of the system pressure of the rough rolling energy accumulator in the speed increase and decrease control;
(2) adjusting the closing time of the rough rolling minimum flow valve, and reducing the impact on a pump and a pipeline in a system after a furnace and in a rough rolling descaling system;
(3) modifying the programs of a post-furnace and rough rolling descaling system: when no heat detection signal is detected 3 minutes after the furnace and the rough rolling and the system pressure is higher than 19.2MPa, the pump speed reduction in the system is controlled, and in addition, the pumps in the system are kept in a high-speed state; detecting that heat detection signals exist after the furnace and in the rough rolling, and immediately accelerating the speed of a pump in the system after the furnace and in the rough rolling descaling system, and simultaneously, immediately accelerating the speed of the pump in the system after the furnace and in the rough rolling descaling system when the pressure of the system is lower than 18.2 MPa; the control mode of the minimum flow valve of the pump outlet in the system for descaling the rough rolling and the after-furnace is realized under the long-term high-speed state of the pump, namely, the precondition is unchanged, and the minimum flow valve is opened and closed according to the pressure of the pump outlet only in the process of raising the speed of the pump in the system for descaling the rough rolling and the after-furnace.
The 1700mm line finish rolling descaling system is low in pressure, surface iron sheet defects often appear when some high-strength acid pickling varieties with high requirements on surface quality are produced, meanwhile, after the finish rolling descaling speed exceeds 1.1m/s in a large production-promoting environment, the descaling effect is obviously reduced, the further improvement of the production line rolling efficiency and the guarantee of the surface quality of high-surface products are seriously influenced by the current descaling effect, the descaling striking height is reduced on the premise that the current water supply amount is not changed after the problem is fully evaluated, and a 6P3 high-striking-force nozzle is adopted to improve the descaling striking force and improve the surface quality.
In the step (2), the opening and closing time of the rough rolling minimum flow valve is adjusted: the minimum flow valve of the pump in the system for descaling and the finish rolling descaling is controlled in a control mode under the long-term high-speed state of the pump in the system for descaling and the finish rolling descaling, namely, the minimum flow valve is closed according to the pressure of the outlet of the pump under the precondition that the pump is not changed and the pump in the system for descaling and the finish rolling descaling is only in the process of increasing the speed and the high-speed state.
In the step (3), after the furnace and the rough rolling descaling system program are modified, the response time of the descaling pump is improved by more than 1.5S, and meanwhile, the descaling system is more stable.
The invention has the beneficial effects that: the production capacity of the rolling line is improved by more than 800 tons/day through the work of equipment transformation, program optimization and the like of a 1700mm line furnace rear and rough rolling descaling system, a finish rolling descaling system and the like; meanwhile, through the transformation of the finish rolling descaling system equipment, the descaling impact force is improved, the descaling effect is improved, the surface quality of the product is improved, and a solid foundation is laid for producing high-surface product quality varieties.
Drawings
FIG. 1 is a graph showing rolling tempo analysis after the implementation of step (1), step (2) and step (3) of the present invention;
FIG. 2 shows the surface quality of SPHC 3.0mm steel before step (3) of the present invention;
FIG. 3 shows the surface quality of SPHC 3.0mm steel after the step (3) of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A high-efficiency descaling control method for a hot-rolled strip production line comprises the following steps:
(1) the hot rolled plate strip production line is 1700mm medium plate blank production lines and is provided with two sets of descaling systems:
furnace back and rough rolling descaling system: two descaling pumps (one for one), a descaler (one for a descaling water beam), a rough rolling descaler (one for a water beam) and a rough rolling descaling PLC control system;
finish rolling descaling system: a finish rolling descaling pump (using two to prepare one), a finish rolling descaling machine (using two for a water beam) and a finish rolling descaling PLC control system.
Actually accessing a system pressure sensor signal, a finish rolling energy accumulator liquid level switch signal and a finish rolling minimum liquid level valve electromagnetic valve signal on a finish rolling energy accumulator pipeline into a furnace and a rough rolling descaling PLC control system on site, and completely disconnecting the signals from the finish rolling descaling PLC control system; the adding module modifies the hardware configuration of the PLC control system after the furnace and the rough rolling descaling system, then adds a program section to control the liquid level and the lowest liquid level valve of the finish rolling energy accumulator in the PLC control system program after the furnace and the rough rolling descaling system, uses the system pressure of the finish rolling energy accumulator in the control program section of the speed increase and decrease of the pump in the system after the furnace and the rough rolling descaling system, and completely replaces the corresponding position of the system pressure of the rough rolling energy accumulator in the speed increase and decrease control;
(2) adjusting the closing time of the rough rolling minimum flow valve, and reducing the impact on a pump and a pipeline in a system after a furnace and in a rough rolling descaling system;
(3) modifying the programs of a post-furnace and rough rolling descaling system: when no heat detection signal is detected 3 minutes after the furnace and the rough rolling and the system pressure is higher than 19.2MPa, the speed of the pump in the system is reduced after the furnace and in the rough rolling descaling system, and in addition, the pump in the system is kept in a high-speed state after the furnace and in the rough rolling descaling system; detecting that heat detection signals exist after the furnace and in the rough rolling, and immediately accelerating the speed of a pump in the system after the furnace and in the rough rolling descaling system, and simultaneously, immediately accelerating the speed of the pump in the system after the furnace and in the rough rolling descaling system when the pressure of the system is lower than 18.2 MPa; the control mode of the minimum flow valve at the outlet of the pump in the system for descaling the steel plate after the furnace and in the system for descaling the steel plate after the rough rolling under the long-term high-speed state of the pump is realized, namely the precondition is unchanged, and the minimum flow valve is opened and closed according to the pressure at the outlet of the pump only in the speed increasing process and the high-speed state of the pump in the system for descaling the steel plate after the furnace and in the high-speed state.
In the step (2), the opening and closing time of the rough rolling minimum flow valve is adjusted: the minimum flow valve of the pump in the system for descaling and the finish rolling descaling is controlled in a control mode under the long-term high-speed state of the pump in the system for descaling and the finish rolling descaling, namely, the minimum flow valve is closed according to the pressure of the outlet of the pump under the precondition that the pump is not changed and the pump in the system for descaling and the finish rolling descaling is only in the process of increasing the speed and the high-speed state.
In the step (3), after the furnace and the rough rolling descaling system program are modified, the response time of the descaling pump is improved by more than 1.5S, and meanwhile, the descaling system is more stable.
Adjusting the striking height of the 1700mm line finish rolling descaling:
modification of a descaling water beam and a water nozzle of a 1700mm finishing mill:
after the invention is adopted, the speed of the rolling mill is increased, the scale removal speed of the specification below 4.0 is increased to more than 1.111m/s, and the inspection surface effect is good; the rhythm can be improved by 8 seconds on average for each steel, and the hourly output can be improved by more than 35t/h on average (more than 800 tons can be produced per day).
Claims (2)
1. A high-efficiency descaling control method for a hot-rolled strip production line is characterized by comprising the following steps:
(1) the hot rolled plate strip production line is 1700mm medium plate blank production lines and is provided with two sets of descaling systems:
a furnace rear and rough rolling descaling system: two descaling pumps are arranged, one is used for preparing the other; two descaling water beams are arranged on the descaler behind the furnace, and one descaling water beam is used for preparing the other descaling water beam; the rough rolling descaler is provided with one water beam; a rough rolling descaling PLC control system;
finish rolling descaling system: setting three finish rolling descaling pumps, namely preparing one from the other; two water beams are arranged on the finish rolling descaler; a precision rolling descaling PLC control system;
actually accessing a system pressure sensor signal, a finish rolling energy accumulator liquid level switch signal and a finish rolling minimum liquid level valve electromagnetic valve signal on a finish rolling energy accumulator pipeline into a furnace and a rough rolling descaling PLC control system on site, and completely disconnecting the signals from the finish rolling descaling PLC control system; firstly, adding a module to modify the hardware configuration of a furnace and a rough rolling descaling PLC control system, then adding a program section to control the liquid level and the lowest liquid level valve of a finish rolling energy accumulator after the furnace and in the rough rolling descaling PLC program, using the system pressure of the finish rolling energy accumulator in the speed increasing and decreasing control program section of a pump in the rough rolling descaling system after the furnace, and completely replacing the corresponding position of the system pressure of the rough rolling energy accumulator in the speed increasing and decreasing control;
(2) adjusting the closing time of the rough rolling minimum flow valve, and reducing the impact on a pump and a pipeline in a system after a furnace and in a rough rolling descaling system;
(3) modifying the programs of a post-furnace and rough rolling descaling system: when no heat detection signal is detected 3 minutes after the furnace and the rough rolling and the system pressure is higher than 19.2MPa, the pump speed reduction in the system is controlled, and in addition, the pumps in the system are kept in a high-speed state; detecting that heat detection signals exist after the furnace and in the rough rolling, immediately increasing the speed of a pump in a descaling system after the furnace and in the rough rolling, and simultaneously controlling the speed of the pump in the descaling system after the furnace and in the rough rolling to be immediately increased when the pressure of the system is lower than 18.2 MPa; the control mode of the minimum flow valve at the outlet of the pump in the system for descaling the steel plate after the furnace and in the system for descaling the steel plate after the rough rolling under the long-term high-speed state of the pump is realized, namely the precondition is unchanged, and the minimum flow valve is opened and closed according to the pressure at the outlet of the pump only in the process of increasing the speed of the pump in the system for descaling the steel plate after the furnace and in the high-speed state.
2. The efficient descaling control method for the hot-rolled strip production line according to claim 1, wherein the efficient descaling control method comprises the following steps: the 1700mm line finish rolling descaling system reduces the descaling striking height on the premise of not changing the current water supply amount, and adopts a high striking force nozzle to improve the descaling striking force and the surface quality.
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| CN202010374511.5A CN111715711B (en) | 2020-05-06 | 2020-05-06 | Efficient descaling control method for hot-rolled strip production line |
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| CN202010374511.5A CN111715711B (en) | 2020-05-06 | 2020-05-06 | Efficient descaling control method for hot-rolled strip production line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2174729A1 (en) * | 2008-10-07 | 2010-04-14 | Siemens Aktiengesellschaft | Ignition device with pump drive with variable speed |
| CN201524703U (en) * | 2009-05-26 | 2010-07-14 | 广州金关节能科技发展有限公司 | Multi-section descaling and energy-saving control device |
| JP5790528B2 (en) * | 2012-02-09 | 2015-10-07 | 東芝三菱電機産業システム株式会社 | Control device for rolling descaling equipment |
| CN107249767B (en) * | 2015-02-09 | 2019-03-01 | 东芝三菱电机产业系统株式会社 | Derusting system and its control device and control method |
| CN105710143B (en) * | 2016-03-16 | 2018-04-20 | 北京金自能源科技发展有限公司 | A kind of energy-conserving reconstruction method of the hot rolling high-pressure water descaling system based on accumulator and high voltage converter |
| JP6819627B2 (en) * | 2018-02-08 | 2021-01-27 | 東芝三菱電機産業システム株式会社 | Pump control device for rolling descaling device |
| CN108906897B (en) * | 2018-06-25 | 2023-08-29 | 鑫鹏源智能装备集团有限公司 | High-pressure water dephosphorization system |
| JP6733827B1 (en) * | 2018-08-20 | 2020-08-05 | 東芝三菱電機産業システム株式会社 | Descaling device pump system controller |
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