CN109116891B - Control method for slow cooling of strip steel of heat treatment furnace - Google Patents
Control method for slow cooling of strip steel of heat treatment furnace Download PDFInfo
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- CN109116891B CN109116891B CN201810861616.6A CN201810861616A CN109116891B CN 109116891 B CN109116891 B CN 109116891B CN 201810861616 A CN201810861616 A CN 201810861616A CN 109116891 B CN109116891 B CN 109116891B
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- slow cooling
- strip steel
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
Abstract
The invention discloses a control method for slow cooling of strip steel of a heat treatment furnace, which relates to the technical field of metallurgy, and comprises the following steps of: performing matching control on the output power of the strip steel of different steel grades and the fan; carrying out matching control on the process speed and the electric heating output power; and maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate. The technical effects that when different steel types and different process speeds operate, the temperature of the strip steel at the slow cooling outlet is always in a stable state, the process index is controlled in a lower limit area, the output power of the fan and the electric heating is reduced to the maximum extent, and the power consumption cost is saved are achieved.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a control method for slow cooling of strip steel of a heat treatment furnace.
Background
A heat treatment furnace of the oriented silicon steel drawing and leveling coating treatment line is designed with a slow cooling section, the slow cooling has a structure of electric heating exchange and water cooling exchange, a heating or cooling bypass is automatically selected according to furnace temperature control, and strip steel is cooled by a circulating fan.
However, in the process of implementing the technical solution in the embodiment of the present invention, the applicant finds that the above prior art has at least the following technical problems:
in the prior art, because furnace temperature control has certain defects, the electric heating output of a circulating fan and an electric heating bypass is always in a full load output state, so that the temperature difference of a steel plate at a slow cooling outlet is large, and if the temperature is too low and cannot reach the process index, the temperature is too high, and the energy is wasted.
Disclosure of Invention
The embodiment of the invention provides a control method for slowly cooling strip steel of a heat treatment furnace, which is used for solving the technical problems that the temperature difference of the steel plate at the outlet of slow cooling is large because the electric heating output of a circulating fan and an electric heating bypass is always in a full load output state due to certain defects in furnace temperature control in the prior art, and the energy is wasted because the temperature is too high if the temperature is too low and cannot reach a process index.
In order to solve the above problems, an embodiment of the present invention provides a method for controlling slow cooling of a heat treatment furnace strip steel, where on the premise of controlling a slow cooling temperature, the method includes: performing matching control on the output power of the strip steel of different steel grades and the fan; carrying out matching control on the process speed and the electric heating output power; and maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate.
Preferably, the control of matching of different steel grades and the output power of the fan comprises: and according to the thickness of the strip steel, the output power of a fan is adjusted downwards, and the cooling amount is reduced, so that the temperature of the strip steel is between the upper limit areas of the process indexes of the plate temperature of the slow cooling outlet.
Preferably, the upper limit area of the process index of the slow cooling outlet plate temperature is 600-620 ℃.
Preferably, after the temperature of the strip steel is between the temperature of the slow cooling outlet plate and the upper limit area, the method comprises the following steps: and reducing the electric heating output power, increasing the cooling speed of the strip steel, and reducing the temperature of the slow cooling outlet plate from the upper limit area to the lower limit area of the process index of the temperature of the slow cooling outlet plate.
Preferably, the lower limit of the process index of the slow cooling outlet plate temperature is 500-.
Preferably, the performing of the matched control of the process speed and the electric heating output power comprises: and on the premise of the same steel grade, performing matching control on the process speed and the electric heating output power, and keeping the temperature of the slow cooling outlet plate unchanged.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a control method for slowly cooling strip steel of a heat treatment furnace, which comprises the following steps of: performing matching control on the output power of the strip steel of different steel grades and the fan; carrying out matching control on the process speed and the electric heating output power; and maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate. The technical problems that the temperature difference of the steel plate at the outlet of the slow cooling outlet is large, if the temperature is too low and cannot reach the process index, the temperature is too high and energy is wasted due to the fact that the electric heating output of a circulating fan and an electric heating bypass is always in a full load output state due to the fact that certain defects exist in furnace temperature control in the prior art are solved, the temperature of the steel plate at the outlet of the slow cooling outlet is always in a stable state when the steel plate runs at different steel grades and different process speeds, the process index is controlled in a lower limit area, the output power of the fan and the electric heating is reduced to the maximum, and the electricity consumption cost is saved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart of a control method for slowly cooling a strip steel in a heat treatment furnace according to an embodiment of the invention;
FIG. 2 is a diagram showing the matching relationship between steel grade and fan output power in the embodiment of the invention;
FIG. 3 is a graph showing the matching relationship between the process speed and the electric heating output power in the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a control method for slowly cooling strip steel of a heat treatment furnace, which is used for solving the technical problems that the temperature difference of a steel plate at a slowly-cooled outlet is large because the electric heating output of a circulating fan and an electric heating bypass is always in a full-load output state due to certain defects in furnace temperature control in the prior art, and the energy is wasted because the temperature is too high if the temperature is too low and cannot reach a process index.
In order to solve the technical problems, the technical scheme provided by the invention has the following general idea: performing matching control on the output power of the strip steel of different steel grades and the fan; carrying out matching control on the process speed and the electric heating output power; and maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate. The technical problems that the temperature difference of the steel plate at the outlet of the slow cooling outlet is large, if the temperature is too low and cannot reach the process index, the temperature is too high and energy is wasted due to the fact that the electric heating output of a circulating fan and an electric heating bypass is always in a full load output state due to the fact that certain defects exist in furnace temperature control in the prior art are solved, the temperature of the steel plate at the outlet of the slow cooling outlet is always in a stable state when the steel plate runs at different steel grades and different process speeds, the process index is controlled in a lower limit area, the output power of the fan and the electric heating is reduced to the maximum, and the electricity consumption cost is saved.
The technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict.
Example one
The embodiment of the present invention provides a method for controlling slow cooling of a heat treatment furnace strip steel, please refer to fig. 1 to 3, and on the premise of controlling the slow cooling temperature, the method includes:
s110, performing matching control on the output power of the strip steel and the fan of different steel types;
further, carry out different steel grades and fan output power matching control, include: according to the thickness of the strip steel, the output power of a fan is adjusted downwards, and the cooling amount is reduced, so that the temperature of the strip steel is between the upper limit areas of the process indexes of the plate temperature of the slow cooling outlet; the upper limit area of the process index of the slow cooling outlet plate temperature is 600-620 ℃.
Further, after the temperature of the strip steel is between the temperature of the slow cooling outlet plate and the upper limit area, the method comprises the following steps: reducing the electric heating output power, increasing the cooling speed of the strip steel, and reducing the temperature of the slow cooling outlet plate from an upper limit area to a lower limit area of the process index of the temperature of the slow cooling outlet plate; the lower limit of the process index of the slow cooling outlet plate temperature is 500-535 ℃.
Specifically, the embodiment of the invention optimizes the design of the temperature control system of the slow cooling area, and performs matching control on the output power of the steel type and the fan, the process running speed and the electric heating output power, so as to control the temperature of the slow cooling outlet plate in a lower limit area (the process index is 500-. Under the current slow cooling temperature control mode, the fan and the electric heating are simultaneously in an upper amplitude limiting output state. Under the condition of the same process speed, the steel types are different (the widths of the steel strips are consistent), and the thinner the steel strips are, the faster the steel strips are cooled, therefore, the embodiment of the application proposes to perform matching control on the output power of the steel strips of different steel types and the fan, namely correspondingly lower the output power of the fan according to the thickness of the steel strips, and reduce the cooling amount, so that the temperature of the steel strips is between the upper limit areas of the process indexes of the plate temperature of the slow cooling outlet, wherein the upper limit area of the process indexes of the plate temperature of the slow cooling outlet is 600-. After the temperature of the strip steel is between the upper limit areas of the temperature of the slow cooling outlet plate, the electric heating output power is reduced, the cooling speed of the strip steel is increased, the temperature of the slow cooling outlet plate is reduced to 535 ℃ from the upper limit areas, namely the temperature of the slow cooling outlet plate is reduced to the lower limit area of the process index, so that the technical effects that when different steel types run, the temperature of the strip steel at the slow cooling outlet is controlled to be in the lower limit area of the process index, the output power of a fan and electric heating is reduced, and the power consumption cost is greatly saved are achieved.
Step S120, carrying out matching control of the process speed and the electric heating output power;
and S130, maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel to be in a lower limit area of the process index of the temperature of the slow cooling outlet plate.
Further, the performing of the matching control of the process speed and the electric heating output power includes: and on the premise of the same steel grade, performing matching control on the process speed and the electric heating output power, and keeping the temperature of the slow cooling outlet plate unchanged.
Specifically, under the condition of the same steel grade, the faster the process speed is, the worse the cooling effect is, and the smaller the electric heating output power is, in view of this, the embodiment of the present application proposes to perform matching control on the process running speed and the electric heating output power, that is, on the premise of the same steel grade, to perform matching control on the process speed and the electric heating output power, to maintain the temperature of the slow cooling outlet plate unchanged, and to control the strip steel temperature at the slow cooling outlet plate temperature between the lower limit areas of the process indexes, thereby achieving the technical effects that when the strip steel runs at different process speeds, the strip steel temperature at the slow cooling outlet is always in a steady state, and is controlled at the lower limit areas of the process indexes, and the electric heating output power is reduced.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a control method for slowly cooling strip steel of a heat treatment furnace, which comprises the following steps of: performing matching control on the output power of the strip steel of different steel grades and the fan; carrying out matching control on the process speed and the electric heating output power; and maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate. The technical problems that the temperature difference of the steel plate at the outlet of the slow cooling outlet is large, if the temperature is too low and cannot reach the process index, the temperature is too high and energy is wasted due to the fact that the electric heating output of a circulating fan and an electric heating bypass is always in a full load output state due to the fact that certain defects exist in furnace temperature control in the prior art are solved, the temperature of the steel plate at the outlet of the slow cooling outlet is always in a stable state when the steel plate runs at different steel grades and different process speeds, the process index is controlled in a lower limit area, the output power of the fan and the electric heating is reduced to the maximum, and the electricity consumption cost is saved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (3)
1. A control method for slow cooling of strip steel of a heat treatment furnace is characterized by comprising the following steps of:
performing matching control on the output power of the strip steel of different steel grades and the fan;
carrying out matching control on the process speed and the electric heating output power;
maintaining the temperature of the slow cooling outlet plate unchanged, and controlling the temperature of the strip steel between the lower limit areas of the process indexes of the temperature of the slow cooling outlet plate;
wherein, carry out different steel grades and fan output power match control, include:
according to the thickness of the strip steel, the output power of a fan is adjusted downwards, and the cooling amount is reduced, so that the temperature of the strip steel is between the upper limit areas of the process indexes of the plate temperature of the slow cooling outlet;
wherein, after the temperature of the strip steel is between the temperature of the slow cooling outlet plate and the upper limit area, the method comprises the following steps:
reducing the electric heating output power, increasing the cooling speed of the strip steel, and reducing the temperature of the slow cooling outlet plate from an upper limit area to a lower limit area of the process index of the temperature of the slow cooling outlet plate;
wherein, the process speed and the electric heating output power matching control comprises the following steps:
and on the premise of the same steel grade, performing matching control on the process speed and the electric heating output power, and keeping the temperature of the slow cooling outlet plate unchanged.
2. The method of claim 1, wherein the slow cooling outlet plate temperature process specification has an upper limit of 600-620 ℃.
3. The method of claim 1, wherein the slow cooling outlet plate temperature process indicator has a lower limit of 500-535 ℃.
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| CN111154966A (en) * | 2020-01-16 | 2020-05-15 | 宝钢湛江钢铁有限公司 | Online automatic adjusting method suitable for continuous annealing unit slow cooling section and fast cooling section cooling fans |
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| WO1994000605A1 (en) * | 1992-06-23 | 1994-01-06 | Nkk Corporation | Metal band cooling apparatus and cooling method therefor |
| CN102279607A (en) * | 2011-07-06 | 2011-12-14 | 联众（广州）不锈钢有限公司 | Annealing furnace zone temperature control method |
| CN203715692U (en) * | 2013-12-31 | 2014-07-16 | 中山凯旋真空技术工程有限公司 | Temperature control system and vacuum air-cooling thermal treatment furnace |
| CN205024290U (en) * | 2015-08-18 | 2016-02-10 | 本钢板材股份有限公司 | Continuous annealing furnace overaging section belted steel cooling device |
| CN107447099A (en) * | 2016-05-31 | 2017-12-08 | 宝钢工业炉工程技术有限公司 | Silicon strip steel heat treatment stove controls cooling section hot blast cooling device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105573350A (en) * | 2015-12-28 | 2016-05-11 | 佛山市索奥斯玻璃技术有限公司 | Frequency automatic tracking control method of cooling fan of glass tempering furnace |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994000605A1 (en) * | 1992-06-23 | 1994-01-06 | Nkk Corporation | Metal band cooling apparatus and cooling method therefor |
| CN102279607A (en) * | 2011-07-06 | 2011-12-14 | 联众（广州）不锈钢有限公司 | Annealing furnace zone temperature control method |
| CN203715692U (en) * | 2013-12-31 | 2014-07-16 | 中山凯旋真空技术工程有限公司 | Temperature control system and vacuum air-cooling thermal treatment furnace |
| CN205024290U (en) * | 2015-08-18 | 2016-02-10 | 本钢板材股份有限公司 | Continuous annealing furnace overaging section belted steel cooling device |
| CN107447099A (en) * | 2016-05-31 | 2017-12-08 | 宝钢工业炉工程技术有限公司 | Silicon strip steel heat treatment stove controls cooling section hot blast cooling device |
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