CN110624960A - Strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling - Google Patents
Strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling Download PDFInfo
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- CN110624960A CN110624960A CN201910904146.1A CN201910904146A CN110624960A CN 110624960 A CN110624960 A CN 110624960A CN 201910904146 A CN201910904146 A CN 201910904146A CN 110624960 A CN110624960 A CN 110624960A
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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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
The invention discloses a strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling, which divides the whole area through a control system, wherein an ultra-fast cooling section, a laminar cooling coarse cooling section and a laminar cooling fine cooling section are sequentially arranged on a rolling line along the rolling running direction of a steel plate, and the control system carries out sectional cooling on strip steel according to different water spraying amount of each cooling section; the temperature measuring device for detecting the surface temperature of the strip steel is arranged in front of the ultrafast cooling section, between an outlet of the ultrafast cooling section and a laminar flow cooling coarse cooling section, between the laminar flow coarse cooling section and a laminar flow fine cooling section and behind the laminar flow cooling fine cooling section.
Description
Technical Field
The invention relates to the technical field of cooling after rolling strip steel, in particular to a strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling.
Background
In the hot continuous rolling production process, the coiling temperature of the strip steel plays a decisive role in the product organization performance and the mechanical performance, in order to increase the market competitiveness of enterprises, an ultra-fast cooling control system is usually and independently added to meet the requirements of reducing the cost of products such as the existing structural steel, pipeline steel and the like, the product process means is promoted, the process technology and equipment support are provided for the hot continuous rolling strip steel production line products with the generalized reduction process potential, the low-cost high-performance stable and smooth production of products such as common carbon low alloy, pipelines and the like is realized, and the ideal coiling temperature and performance guarantee of the strip steel is realized.
According to the traditional hot continuous rolling conventional laminar cooling control system, strip steel passes through a rough cooling area and a fine cooling area from a finish rolling final stand, each cooling area consists of an upper collecting pipe and a lower collecting pipe, the water quantity of a single collecting pipe is controlled by a manual valve on site, and the water spraying quantity of the upper collecting pipe and the lower collecting pipe is calculated according to the strip steel speed, the coiling temperature and the like in system control, so that the whole cooling control process is completed.
Because the effective cooling length of the original laminar cooling is shortened, the requirement of the coiling temperature process cannot be met according to the original laminar flow mode.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling, wherein the pressure of an ultra-fast cooling system is reduced and is regarded as a part of laminar cooling to be used so as to ensure that the coiling temperature of the strip steel is hit and the organizational structure performance meets the standard.
In order to achieve the purpose, the invention adopts the following technical scheme:
a strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling is characterized in that the whole area is divided by a control system, an ultra-fast cooling section, a laminar cooling coarse cooling section and a laminar cooling fine cooling section are sequentially arranged on a rolling line along the rolling running direction of a steel plate, the control system carries out sectional cooling on strip steel according to different water spraying quantities of each cooling section, and a first pyrometer for detecting the surface temperature of the strip steel after final rolling is arranged in front of the ultra-fast cooling section; a second pyrometer for detecting the surface temperature of the strip steel after the ultra-fast cooling is arranged between the outlet of the ultra-fast cooling section and the laminar cooling coarse cooling section; a third pyrometer for detecting the surface temperature of the strip steel after laminar flow coarse cooling is arranged between the laminar flow coarse cooling section and the laminar flow fine cooling section; a fourth pyrometer for detecting the surface temperature of the strip steel after laminar flow fine cooling is arranged behind the laminar flow cooling fine cooling section; when cooling, belted steel is in proper order through ultrafast cold section, thick cold section and smart cold section to the actual temperature that the pyrometer that utilizes behind every cooling zone detected carries out feedback control in order to reach the precision that promotes each cooling zone control temperature, according to the demand of the different water pressures of ultrafast cold section, divides high pressure control mode and low pressure control mode into in control system, wherein:
high-pressure control mode: from the control of the finish rolling temperature, according to the actual temperature deviation value of the surface of the strip steel detected by the first pyrometer, the number of cooling water valve opening of the rough cooling section and the finish cooling section is controlled in a feedforward mode, and the number of cooling water valve opening of the ultra-fast cooling section is adjusted in a feedback control mode;
according to the deviation value of the surface temperature of the strip steel detected by the fourth pyrometer, the quantity of open valves of the finish cooling section is adjusted by feedback control so as to meet the requirement that the coiling temperature meets the process requirement;
and (3) a low-voltage control mode: from the control of the finish rolling temperature, according to the actual temperature deviation value of the strip steel detected by the third pyrometer, the valve opening number of the finish cooling section is controlled in a feedforward mode, and the valve opening number of the ultra-fast cooling section and the rough cooling section is adjusted in a feedback mode; and (4) according to the actual temperature deviation value of the strip steel detected by the fourth pyrometer, feedback control is performed to adjust the quantity of open valves of the fine cooling section so as to meet the requirement that the coiling temperature meets the process requirement.
The control system is divided into a front-section main cooling part, a rear-section main cooling part, a sparse cooling part, an upper-section cooling part and a lower-section cooling part according to the technological performance requirements of steel production, wherein the front-section main cooling part is continuously opened from an ultra-fast cooling part in sequence, and a fine cooling part is used as auxiliary cooling;
the back-stage main cooling is that valves are continuously opened in sequence from the fine cooling section, and the ultra-fast cooling section is used as auxiliary cooling;
sparse cooling is realized by opening valves at intervals from the ultra-fast cooling section;
the upper section cooling is a mode that only the upper collecting pipe is arranged for spraying water, and the lower collecting pipe does not spray water;
the lower stage cooling is a mode in which only the lower header is provided to spray water, and the upper header does not spray water.
The total flow of the ultrafast cooling section comprising the upper and the lower 30 groups of water spraying headers is about 4200m3The total flow rate of the laminar flow coarse cooling section comprising the upper and lower 9 groups of collecting pipes is about 3200m3The total flow rate of the laminar flow fine cooling section comprising the upper and lower 18 groups of collecting pipes is about 3080m3/h。
The ultrafast cooling section adopts a form of matching a slit nozzle with a high-density nozzle;
the laminar flow rough cooling section adopts a single DN200 valve to control the rough cooling form of the 6-row collecting pipe;
the laminar flow fine cooling section adopts a fine cooling mode of a single DN100 valve control 3-row header.
The high-pressure control mode corresponds to the on-site water pressure requirement of 0.8Mpa, and the ultrafast cooling section is used as a main cooling section, so that the temperature of the inner surface of the strip steel is reduced by 250-350 ℃ in a short time, the cooling rate is 80 ℃/S, and crystals in the strip steel are converted into bainite from austenite; the low-pressure control mode corresponds to a combined mode of ultra-fast cooling and laminar cooling, the combined mode is regarded as a whole in the control model and is virtually divided according to the valve sequence, and when the steel rolling is subjected to real-time cooling control, the valve opening cooling is carried out according to the rule arranged by the cooling mode.
Has the advantages that:
the invention uses the ultra-fast cooling section to carry out fast cooling, so that the crystals in the strip steel are changed fast, thereby realizing the purpose of reducing the alloy content in the plate blank and promoting that the laminar cooling control must be more rigorous and accurate in the control of the hot continuous rolling process;
the rough cooling section is used as an auxiliary cooling section, and the fine cooling section is used as a feedback adjusting section for improving the control of the coiling temperature, so that the control precision of the coiling temperature is effectively improved.
Drawings
FIG. 1 is a schematic structural view of a strip steel cooling line according to the present invention;
wherein, 1, a first pyrometer; 2. a second pyrometer; 3. a third pyrometer; 4. a fourth pyrometer; 5. an ultrafast cold spray header; 6. a water spray collecting pipe of the rough cooling section; 7. and a water spray header of the fine cooling section.
Detailed Description
The invention aims to provide a control method combining ultra-fast cooling and conventional laminar cooling, which is used for ensuring that the coiling temperature of strip steel is hit and the performance of a tissue structure meets the standard by using the pressure reduction of an ultra-fast cooling system as a part of laminar cooling.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined control method for ultra-fast cooling and laminar cooling mainly comprises the steps of regarding an ultra-fast cooling collecting pipe and a laminar cooling collecting pipe as a whole, dividing the whole area through a computer control system, and dividing the ultra-fast cooling collecting pipe into an ultra-fast cooling section, a coarse cooling section and a fine cooling section according to different collecting pipe types, wherein the ultra-fast cooling section comprises 30 groups of collecting pipes, and the total flow of the collecting pipes is about 4200m3The total flow rate of the coarse cooling section containing 9 groups of headers is about 3200m3The fine cooling section comprises 18 groups of collecting pipes with the total flow rate of about 3080m3H; the control system carries out sectional cooling on the strip steel according to different water spraying amount of each cooling section; when cooling, the strip steel sequentially passes through the ultra-fast cooling section, the rough cooling section and the fine cooling section, and feedback control is performed by using the actual temperature detected by the pyrometer behind each cooling section so as to improve the precision of the control temperature of each cooling section.
The invention uses the ultra-fast cooling section to carry out fast (extremely fast) cooling, so that the crystals in the strip steel are changed rapidly, thereby realizing the purpose of reducing the alloy content in the plate blank and promoting that the laminar cooling control must be more rigorous and accurate in the control of the hot continuous rolling process; the rough cooling section is used as an auxiliary cooling section, and the fine cooling section is used as a feedback adjusting section for improving the control of the coiling temperature, so that the control precision of the coiling temperature is effectively improved.
First pyrometer: the control of the cooling temperature point after rolling is started before the ultra-fast cooling equipment;
② second pyrometer: the temperature point is positioned between the ultrafast cooling outlet and the laminar cooling rough cooling section, is used for detecting the temperature point of the ultrafast cooling outlet, is used for calculating the quantity of the opened laminar cooling valves by a model, and simultaneously adjusts the increase or decrease of the quantity of the opened laminar cooling valves according to the feedback of the temperature point;
third pyrometer: the temperature point is positioned between the laminar flow coarse cooling section and the fine cooling section, is used for detecting the temperature point of the outlet of the coarse cooling section and is used for calculating the opening quantity of valves of the fine cooling section by a model;
fourth pyrometer: after the laminar cooling fine cooling section, the temperature of the cooled strip steel is mainly detected, whether the temperature point hits the temperature point directly influences the organization performance of a finished product or not is a key temperature control point in the production process;
the ultrafast cooling section adopts a form of matching a slit nozzle with a high-density nozzle;
the coarse cooling section adopts a single DN200 valve to control the coarse cooling form of the 6-row collecting pipe;
the fine cooling section adopts a fine cooling mode of controlling a 3-row collecting pipe by a single DN100 valve;
as shown in fig. 1, the whole cooling equipment after rolling is divided into three cooling sections, namely an ultra-fast cooling section, a rough cooling section and a fine cooling section according to different headers, wherein the ultra-fast cooling section comprises an upper water spray header and a lower water spray header of 30 groups, the rough cooling section comprises an upper water spray header of 9 groups, the fine cooling section comprises an upper water spray header of 18 groups, and a pyrometer is arranged behind each cooling section and used for measuring the temperature of an outlet of the cooling section; all cooling sections are regarded as a whole in the control system and are virtually divided into 128 sections in the upper and lower parts according to the valve sequence, modes such as front-section main cooling, rear-section main cooling, sparse cooling, upper-section cooling, lower-section cooling and the like are divided in the control system according to the requirements of the technological performance of steel grades, and the following description is given through specific embodiments in the actual production of different steel grades.
The front section is mainly cooled: the pipeline steel X70 is applicable to steel grade rapidly cooled in a high-temperature area;
rear-section main cooling: the gas cylinder steel HP295 is suitable for slow cooling in a high-temperature area and fast cooling in a low-temperature area
Sparse cooling: the general carbon structural steel Q235B is suitable for being uniformly cooled from the finish rolling temperature to the coiling temperature;
cooling the upper section: the checkered plate is suitable for special requirement steel;
cooling at the lower section: the checkered plate is suitable for special requirement steel;
the front-section main cooling is characterized in that a valve is continuously opened in sequence from an ultra-fast cooling section, and a fine cooling section is used as auxiliary cooling and is suitable for fast cooling in a high-temperature area; the back-stage main cooling is that valves are continuously opened in sequence from the fine cooling section, and the ultra-fast cooling section is used for auxiliary cooling, and is suitable for slow cooling in a high-temperature area and fast cooling in a low-temperature area; the sparse cooling is realized by opening valves at intervals from the ultra-fast cooling section, and is suitable for uniformly cooling from the finish rolling temperature to the coiling temperature; the upper section cooling is a mode that only the upper collecting pipe is arranged for spraying water, and the lower collecting pipe does not spray water; the lower section cooling is a mode that only the lower collecting pipe is arranged for spraying water, and the upper collecting pipe does not spray water;
after the strip steel passes through each cooling section, the temperature detected by the pyrometer is subjected to feedforward control and feedback control, and important feedback control is placed in a fine cooling section so as to adjust the size of the water spray header in time to realize the hit of the coiling temperature.
According to the requirements of different water pressures of an ultra-fast cooling section, a high-pressure control mode and a low-pressure control mode are divided in a mathematical model control system, the high-pressure control mode and the low-pressure control mode respectively correspond to the field water pressure requirements of 0.8Mpa and 0.4Mpa, the number of water supply pumps is 3, 2, the effect of replacing gold with water is realized in a fast cooling mode in the high-pressure mode, and the ultra-fast cooling and laminar cooling combined mode is used for cooling in the low-pressure mode, so that the specification of rolled products is expanded, and the market share is increased.
Example (b): the process of the plain carbon steel Q235B requires a finish rolling temperature of 880 ℃ and a coiling temperature of 620 ℃, and introduces the ideas of feedback control of cooling in a high-pressure mode and a low-pressure mode respectively.
High-pressure control mode: starting from the control of the final rolling temperature of 880 ℃, feedforward controlling the open valve number of a rough cooling section and a fine cooling section according to the actual temperature deviation value of the surface of the strip steel detected by an ultra-fast cooling pyrometer, and feedback controlling and adjusting the open valve number of the ultra-fast cooling section; according to the deviation value of the surface temperature of the strip steel detected by the coiling pyrometer, the quantity of valve opening of the fine cooling section is adjusted by feedback control so as to meet the requirement that the coiling temperature reaches 620 ℃ of the process requirement.
And (3) a low-voltage control mode: starting from the control of the final rolling temperature of 880 ℃, feedforward controlling the number of open valves of a finish cooling section and feedback adjusting the number of open valves of an ultra-fast cooling section and a rough cooling section according to the actual temperature deviation value of the strip steel detected by a middle pyrometer; according to the actual temperature deviation value of the strip steel detected by the coiling pyrometer, the quantity of valve opening of the fine cooling section is adjusted by feedback control so as to meet the requirement that the coiling temperature reaches 620 ℃ of the process requirement.
Claims (5)
1. A strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling divides the whole area through a control system, three parts of an ultra-fast cooling section, a laminar cooling coarse cooling section and a laminar cooling fine cooling section are sequentially arranged on a rolling line along the rolling running direction of a steel plate, and the control system carries out sectional cooling on strip steel according to different water spraying quantities of each cooling section; a second pyrometer for detecting the surface temperature of the strip steel after the ultra-fast cooling is arranged between the outlet of the ultra-fast cooling section and the laminar cooling coarse cooling section; a third pyrometer for detecting the surface temperature of the strip steel after laminar flow coarse cooling is arranged between the laminar flow coarse cooling section and the laminar flow fine cooling section; a fourth pyrometer for detecting the surface temperature of the strip steel after laminar flow fine cooling is arranged behind the laminar flow cooling fine cooling section; when cooling, belted steel is in proper order through ultrafast cold section, thick cold section and smart cold section to the actual temperature that the pyrometer that utilizes behind every cooling zone detected carries out feedback control in order to reach the precision that promotes each cooling zone control temperature, according to the demand of the different water pressures of ultrafast cold section, divides high pressure control mode and low pressure control mode into in control system, wherein:
high-pressure control mode: from the control of the finish rolling temperature, according to the actual temperature deviation value of the surface of the strip steel detected by the first pyrometer, the number of cooling water valve opening of the rough cooling section and the finish cooling section is controlled in a feedforward mode, and the number of cooling water valve opening of the ultra-fast cooling section is adjusted in a feedback control mode;
according to the deviation value of the surface temperature of the strip steel detected by the fourth pyrometer, the quantity of open valves of the finish cooling section is adjusted by feedback control so as to meet the requirement that the coiling temperature meets the process requirement;
and (3) a low-voltage control mode: from the control of the finish rolling temperature, according to the actual temperature deviation value of the strip steel detected by the third pyrometer, the valve opening number of the finish cooling section is controlled in a feedforward mode, and the valve opening number of the ultra-fast cooling section and the rough cooling section is adjusted in a feedback mode; and (4) according to the actual temperature deviation value of the strip steel detected by the fourth pyrometer, feedback control is performed to adjust the quantity of open valves of the fine cooling section so as to meet the requirement that the coiling temperature meets the process requirement.
2. The strip steel cooling control method combining the ultra-fast cooling and the conventional laminar cooling according to claim 1, wherein the control system is divided into a front-stage main cooling, a rear-stage main cooling, a sparse cooling, an upper-stage cooling and a lower-stage cooling according to the process performance requirements of steel production, wherein the front-stage main cooling is continuously opened in sequence from the ultra-fast cooling section, and the fine cooling section is used as an auxiliary cooling;
the back-stage main cooling is that valves are continuously opened in sequence from the fine cooling section, and the ultra-fast cooling section is used as auxiliary cooling;
sparse cooling is realized by opening valves at intervals from the ultra-fast cooling section;
the upper section cooling is a mode that only the upper collecting pipe is arranged for spraying water, and the lower collecting pipe does not spray water;
the lower stage cooling is a mode in which only the lower header is provided to spray water, and the upper header does not spray water.
3. The method for controlling cooling of strip steel by combining ultra-fast cooling with conventional laminar cooling according to claim 1, wherein said ultra-fast cooling section comprises upper and lower 30 sets of water spray headers with a total flow rate of about 4200m3The total flow rate of the laminar flow coarse cooling section comprising the upper and lower 9 groups of collecting pipes is about 3200m3The total flow rate of the laminar flow fine cooling section comprising the upper and lower 18 groups of collecting pipes is about 3080m3/h。
4. The method for controlling cooling of strip steel by combining ultrafast cooling with conventional laminar cooling according to claim 1, wherein the ultrafast cooling section is in the form of a slot nozzle and a high-density nozzle;
the laminar flow rough cooling section adopts a single DN200 valve to control the rough cooling form of the 6-row collecting pipe;
the laminar flow fine cooling section adopts a fine cooling mode of a single DN100 valve control 3-row header.
5. The strip steel cooling control method combining ultra-fast cooling and conventional laminar cooling according to claim 1, characterized in that the high-pressure control mode corresponds to the on-site water pressure requirement of 0.8Mpa, and the ultra-fast cooling section is used as a main cooling section, so that the temperature of the inner surface of the strip steel is reduced by 250-; the low-pressure control mode corresponds to a combined mode of ultra-fast cooling and laminar cooling, the combined mode is regarded as a whole in the control model and is virtually divided according to the valve sequence, and when the steel rolling is subjected to real-time cooling control, the valve opening cooling is carried out according to the rule arranged by the cooling mode.
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| CN112090968B (en) * | 2020-08-28 | 2022-03-25 | 中冶华天工程技术有限公司 | Water cooling control system and control method for long material rolling |
| CN112090969B (en) * | 2020-08-28 | 2022-04-22 | 中冶华天工程技术有限公司 | Through water cooling control method and system for long material rolling |
| CN112090970B (en) * | 2020-08-28 | 2022-04-22 | 中冶华天工程技术有限公司 | Water cooling control system and control method for long material rolling |
| CN112474814A (en) * | 2020-10-29 | 2021-03-12 | 鞍钢集团自动化有限公司 | Energy-saving control method for ultra-fast cold pressure |
| CN114250413A (en) * | 2021-11-24 | 2022-03-29 | 邯郸钢铁集团有限责任公司 | Tempering-free hot-rolled Gepa-grade high-strength steel and production method thereof |
| CN117463794A (en) * | 2023-12-26 | 2024-01-30 | 东北大学 | Multi-target cooperative control method based on UFCT, MT and CT |
| CN117463794B (en) * | 2023-12-26 | 2024-02-23 | 东北大学 | Multi-target cooperative control method based on UFCT, MT and CT |
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