CN115961137A - Temperature accurate control method of continuous annealing powerful water mist cooling system - Google Patents
Temperature accurate control method of continuous annealing powerful water mist cooling system Download PDFInfo
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- CN115961137A CN115961137A CN202211090114.0A CN202211090114A CN115961137A CN 115961137 A CN115961137 A CN 115961137A CN 202211090114 A CN202211090114 A CN 202211090114A CN 115961137 A CN115961137 A CN 115961137A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001816 cooling Methods 0.000 title claims abstract description 33
- 239000003595 mist Substances 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000137 annealing Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 64
- 239000010959 steel Substances 0.000 claims abstract description 64
- 239000007921 spray Substances 0.000 claims abstract description 56
- 230000008569 process Effects 0.000 claims abstract description 25
- 238000009826 distribution Methods 0.000 claims abstract description 14
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000009827 uniform distribution Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a temperature accurate control method of a continuous annealing strong water mist cooling system, which comprises the steps of constructing a discrete model of strip steel under the action of a single spray beam, collecting equipment process parameters and field feedback data of a water mist cooling section, calculating the number of effective nozzles corresponding to the strip steel, calculating the temperature absolute difference value of each unit of the strip steel, calculating the opening value of each nozzle, issuing the opening value of each nozzle, re-collecting the temperature value of the strip steel and judging whether the temperature distribution of the strip steel reaches the standard or not. The invention combines the water mist cooling equipment of the continuous annealing unit, ensures the transverse uniform distribution of the temperature of the strip steel in the water mist cooling section of the continuous annealing unit, improves the quality and performance of the finished product strip steel and reduces the production defects of the strip steel.
Description
Technical Field
The invention belongs to the technical field of continuous annealing, and particularly relates to a temperature accurate control method of a continuous annealing strong water mist cooling system.
Background
The strong water mist cooling technology is a main process of a rapid cooling section of strip steel in a continuous annealing process, can meet the requirement of the cooling rate of ultrahigh-strength steel, and influences the uniformity of the product performance and the plate shape due to the distribution of the temperature of the strip steel in the cooling process. Changes in the strip temperature can cause a redistribution of stresses within the strip which can lead to numerous uncontrolled defects in the strip during cooling. Therefore, the regulation and control of the transverse distribution uniformity of the strip steel temperature in the cooling process are main influence factors for the quality of the strip steel.
The control of the strip steel temperature of the water mist cooling section is mainly finished by nozzles, and the number of spray beams, the positions of the spray beams, the number of the nozzles and the opening degree of the nozzles are main factors for controlling the distribution positions and the sizes of the water mist. Because the transverse non-uniformity of the temperature can cause a plurality of defects of the strip steel, the main temperature regulation and control modes of the production field are as follows: 1. the integral regulation and control of the strip steel temperature are realized by adjusting the number of the spray beams; 2. the position of the spray beam is adjusted to realize the temperature change in the running direction of the strip steel; 3. the number and the opening degree of the nozzles are adjusted to realize the transverse distribution of the strip steel temperature. Although the temperature can be regulated in the modes, the temperature regulation of the strip steel cannot be accurately set under the coupling of various factors such as the number of the spray beams, the positions of the spray beams, the number of the nozzles and the opening degree of the nozzles, and the temperature distribution of the strip steel at the outlet can only be visually judged in a production field and can be roughly controlled by depending on experience.
In addition, the temperature of the strip changes at each location during the run as the strip advances, because each nozzle on each spray beam changes the strip temperature. Therefore, in order to realize the transverse uniform distribution of the temperature of the strip steel in the water mist cooling section in the continuous annealing process, ensure the quality and the performance of the finished product strip steel and reduce the production defects, the development of a new nozzle opening degree adjusting method is very important.
Disclosure of Invention
The invention aims to provide a temperature accurate control method of a continuous annealing strong water mist cooling system, which can accurately control the transverse temperature uniform distribution of a continuous annealing strip steel in a water mist cooling section and can also reduce strip steel plate shape defects caused by temperature distribution.
In order to achieve the technical purpose, the invention adopts the following technical scheme: the method for accurately controlling the temperature of the continuous annealing strong water mist cooling system is characterized by comprising the following steps of:
(A) Constructing a discrete model of the strip steel under the action of a single spray beam, determining the number of nozzles acting on the strip steel, performing corresponding unit division on the strip steel according to the positions of the nozzles, and adjusting the temperature of the corresponding unit strip steel by the single nozzle;
(B) Collecting equipment process parameters and field feedback data of a water mist cooling section, comprising: the number m of spray beams, the number N of nozzles contained in each row of spray beams and the maximum value K of opening degree of the nozzles max Opening K of each nozzle in each spray beam i,j The distance d between adjacent nozzles, the width B of the strip steel and the corresponding temperature value T of the single unit of the strip steel j ；
(C) Calculating to obtain the number n of effective nozzles corresponding to the strip steel, and performing integrated calculation on the temperature value corresponding to each unit of the strip steel to obtain the absolute temperature difference delta T of each unit of the strip steel at the outlet in the current process j ：
(D) Calculating the opening degree adjustment quantity delta K 'which should be made by each nozzle of the mth row of spray beams under the current temperature difference by adjusting the last row of spray beams as an initial adjustment state' m,j Wherein T is x As a current DeltaT j Corresponding to the maximum value of the temperature interval, K x As a current DeltaT j The following corresponding opening degree adjustment amounts:
(E) Calculating an opening value K 'of each nozzle of the m-th row of spray beams' m,j ：
(F) Judging that K is more than or equal to 0 m,j +△K′ m,j ≤△K max Is there any? If yes, switching to the step (J), and if not, switching to the step (G);
(G) Calculating the opening degree data that the m-th row of spray beams do not satisfy to obtain the opening degree adjustment quantity delta K 'that the m-1-th row of spray beams should make' m-1,j ：
(H) Calculating an opening value K 'of each nozzle of the m-1 row of spray beams' m-1,j ：
(I) Judging that K is more than or equal to 0 m-1,j +△K′ m-1,j ≤△K max Is there any? If yes, the process proceeds to step (J), and if no, the process proceeds to step (G) with m = m-1;
(J) Sending each nozzle opening value K of each row of spray beams to a PLC' i,j Keeping the adjusted opening value for 30 seconds, and re-collecting the temperature value T corresponding to the single unit of the strip steel j ；
(K) Calculating an annealing band steel temperature transverse distribution objective function G (X):
(L) determining whether G (X) ≦ e? Wherein epsilon is an on-site process value, if yes, the process is ended, and if not, the step (C) is carried out.
The invention has the beneficial effects that: by adopting the method, the nozzle opening degree optimization and adjustment method suitable for the water mist cooling process of the continuous annealing unit is designed by taking the transverse distribution of the temperature of the strip steel outlet as the target, and the uniformity control effect of the strip steel outlet temperature in the water mist cooling section is improved to a great extent.
The invention is applied to the water mist cooling equipment of the quick cooling section of a certain continuous annealing unit, can improve the quality of finished products of strip steel products and bring economic benefits to enterprises.
Drawings
FIG. 1 is a flow chart of the temperature accurate control method of the continuous annealing strong water mist cooling system of the invention
FIG. 2 is a discrete model of a strip under the action of a single spray beam in the present invention.
FIG. 3 is a temperature distribution chart before and after the control in example 1 of the present invention.
FIG. 4 is a temperature distribution diagram before and after control in example 2 of the present invention
Detailed Description
In order to further explain the application process of the technology, the production performance of a water mist cooling process section of a certain continuous annealing production line is taken as an example to explain the application condition of the method on the spot in detail.
Example 1
As shown in FIG. 1, the method for accurately controlling the temperature of the continuous annealing powerful water mist cooling system comprises the following implementation steps:
(1) In the step (A), constructing a discrete model of the strip steel under the action of a single spray beam, as shown in figure 2;
(2) In the step (B), collecting the main equipment process parameters and the field feedback data of the water mist cooling section comprises the following steps: the number of spray beams is m =10, each row of spray beams contains N =5 spray nozzles, and the maximum value of the opening degree of the spray nozzles is K max =100, opening degree K of each nozzle in each spray beam i,j See table 1, distance d =400 between adjacent nozzles, strip width B =1400, and temperature value T corresponding to a single unit of strip steel j = {219.2,237.8,253.1,241.5,221.3}, unit;
table 1 example 1 opening K of each nozzle in each spray beam i,j
(3) In the step (C), the effective nozzle number n corresponding to the strip steel is obtained through calculation, the temperature value corresponding to each unit of the strip steel is integrated and calculated, and the absolute temperature difference Delta T of each unit of the strip steel at the outlet in the current process is obtained j ：
Calculated n =5,. DELTA.T j = 15.4,3.2,18.5,6.9, -13.3}, in units of;
(4) In step (D), with the adjustment of the last row of spray beams as an initial adjustment state, calculating the opening degree adjustment quantity delta K 'which should be made by each nozzle of the mth row of spray beams under the current temperature difference value' m,j Wherein T is x As a current DeltaT j Corresponding to the maximum value of the temperature interval, K x As a current DeltaT j The following corresponding opening degree adjustment amounts:
calculated delta K' m,j ＝{-2.15,-0.29,1.24,0.08,-1.94}；
(5) In the step (E), an opening value K 'of each nozzle of the m-th row of spray beams is calculated' m,j ：
Calculated K' m,j ＝{37.75,39.71,41.24,40.08,38.06}；
(6) In the step (F), 0. Ltoreq.K is judged m,j +△K′ m,j ≤△K max Is there any? If the judgment result is true, the step (J) is carried out;
(7) In the step (J), the opening degree value K 'of each nozzle of each row of the spray beams is issued to the PLC' i,j Keeping the adjusted opening value for 30 seconds, and re-collecting the temperature value T corresponding to the single unit of the strip steel j = {225.1,239.5,244.8,236.6,228.2}, unit;
(8) In the step (K), calculating an annealing steel strip temperature transverse distribution objective function G (X):
calculated G (X) =65.7;
(9) In step (L), it is determined whether G (X) ≦ epsilon? Wherein epsilon =100, and the calculation is finished after the judgment is established.
In the embodiment, the opening of the nozzle of the water mist cooling section is regulated and controlled, so that the temperature at the outlet of the strip steel is transversely distributed and homogenized, the probability of the strip steel having defects is reduced, and the conditions before and after regulation and control are shown in figure 3.
Example 2
As shown in FIG. 1, the method for accurately controlling the temperature of the continuous annealing powerful water mist cooling system comprises the following implementation steps:
(1) In the step (A), constructing a discrete model of the strip steel under the action of a single spray beam, as shown in figure 2;
(2) In the step (B), collecting the main equipment process parameters and the field feedback data of the water mist cooling section comprises the following steps: the number of spray beams is m =10, each row of spray beams contains N =5 spray nozzles, and the maximum opening K of the spray nozzles max =100, opening degree K of each nozzle in each spray beam i,j See table 2, distance d =400 between adjacent nozzles, strip width B =1600, temperature value T corresponding to single unit of strip j = {221.4,235.3,255.4,242.2,221.6}, unit;
table 2 example 2 opening K of each nozzle in each spray beam i,j
(3) In the step (C), the effective nozzle number n corresponding to the strip steel is obtained through calculation, the temperature value corresponding to each unit of the strip steel is integrated and calculated, and the absolute temperature difference Delta T of each unit of the strip steel at the outlet in the current process is obtained j ：
Calculated n =5,. DELTA.T j = 9, -1.1,19,6, -14.8}, in units;
(4) In the step (D), the current temperature is calculated by adjusting the last row of spray beams as an initial adjusting stateOpening degree adjustment quantity delta K 'to be made by each nozzle of the mth row of spray beams according to difference value' m,j Wherein T is x As a current DeltaT j Corresponding to the maximum value of the temperature interval, K x As a current DeltaT j The following corresponding opening degree adjustment amounts:
calculated delta K' m,j ＝{-1.62,-0.83,1.18,-0.12,1.18}；
(5) In the step (E), an opening value K 'of each nozzle of the m-th row of spray beams is calculated' m,j ：
Calculated K' m,j ＝{0,0,1.18,0,1.18}；
(6) In the step (F), it is judged that K is 0. Ltoreq.K m,j +△K′ m,j ≤△K max Is there any? If the judgment is not true, the step (G) is carried out;
(7) In the step (G), the opening degree data that the m-th row spray beam does not satisfy is calculated to obtain the opening degree adjustment quantity delta K 'that the m-1-th row spray beam should make' m-1,j ：
Calculated Delta K' m-1,j ＝{-0.95,-0.19,0.64,0.52,0.64}；
(8) Calculating the opening degree value K 'of each nozzle of the m-1 row of spray beams' m-1,j ：
Calculated K' m-1,j ＝{39.05,39.81,40.64,40.52,40.64}；
(9) Judging k is more than or equal to 0 m-1，j+ ΔK′ m-1，j ≤ΔK max Is there any?If the judgment result is true, the step (J) is carried out;
(10) In the step (J), the opening value K 'of each nozzle of each row of the spray beams is issued to the PLC' i,j Keeping the adjusted opening value for 30 seconds, and re-collecting the temperature value T corresponding to the single unit of the strip steel j = {229.2,236.3,243.5,242.3,223.6}, unit;
(11) In step (K), an annealing strip temperature transverse distribution objective function G (X) is calculated:
calculated G (X) =58.2;
(12) In step (L), it is determined whether G (X) ≦ epsilon? Wherein epsilon =100, and the calculation is finished after the judgment is true.
In the embodiment, the opening of the nozzle of the water mist cooling section is regulated and controlled, so that the temperature at the outlet of the strip steel is transversely distributed and homogenized, the probability of the strip steel having defects is reduced, and the conditions before and after regulation and control are shown in figure 4.
The above description is only for the purpose of illustrating the technical solutions of the present invention, and those skilled in the art can make simple modifications or equivalent substitutions on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (1)
1. The method for accurately controlling the temperature of the continuous annealing powerful water mist cooling system is characterized by comprising the following steps of:
(A) Constructing a discrete model of the strip steel under the action of a single spray beam, determining the number of nozzles acting on the strip steel, performing corresponding unit division on the strip steel according to the positions of the nozzles, and adjusting the temperature of the corresponding unit strip steel by the single nozzle;
(B) Collecting equipment process parameters and field feedback data of a water mist cooling section, comprising the following steps: the number m of spray beams, the number N of nozzles contained in each row of spray beams and the maximum value K of opening degree of the nozzles max Opening K of each nozzle in each spray beam i,j The distance d between adjacent nozzles, the width B of the strip steel and the corresponding temperature value T of the single unit of the strip steel j ；
(C) Calculating to obtain the number n of effective nozzles corresponding to the strip steel, and performing integrated calculation on the temperature value corresponding to each unit of the strip steel to obtain the absolute temperature difference delta T of each unit of the strip steel at the outlet in the current process j ：
(D) Calculating the opening degree adjustment quantity delta K 'which should be made by each nozzle of the mth row of spray beams under the current temperature difference by adjusting the last row of spray beams as an initial adjustment state' m,j Wherein T is x As a current DeltaT j Corresponding to the maximum value of the temperature interval, K x As a current DeltaT j The following corresponding opening degree adjustment amounts:
(E) Calculating an opening degree value K 'of each nozzle of the m-th row of spray beams' m,j ：
(F) Judging that K is more than or equal to 0 m,j +△K′ m,j ≤△K max Is there any? If yes, switching to the step (J), and if not, switching to the step (G);
(G) Calculating the opening degree data that the m-th row of spray beams do not meet to obtain the opening degree adjustment quantity delta K 'that the m-1 th row of spray beams should make' m-1,j ：
(H) Calculating an opening value K 'of each nozzle of the m-1 row of spray beams' m-1,j ：
(I) Judging that K is more than or equal to 0 m-1,j +△K′ m-1,j ≤△K max Is there any? If yes, the process proceeds to step (J), and if no, the process proceeds to step (G) with m = m-1;
(J) Sending each nozzle opening value K of each row of spray beams to PLC i ′ ,j Keeping the adjusted opening value for 30 seconds, and re-collecting the temperature value T corresponding to the single unit of the strip steel j ；
(K) Calculating an objective function G (X) of transverse distribution of the temperature of the annealing steel strip:
(L) determining whether G (X) ≦ e? Wherein epsilon is an on-site process value, if yes, the process is ended, and if not, the step (C) is carried out.
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| JP2000271626A (en) * | 1999-03-29 | 2000-10-03 | Kawasaki Steel Corp | Method for controlling coiling temperature |
| WO2010083726A1 (en) * | 2009-01-21 | 2010-07-29 | 中冶赛迪工程技术股份有限公司 | Shape control method of hot rolled strip or slab and device thereof |
| KR20110012734A (en) * | 2009-07-31 | 2011-02-09 | 주식회사 포스코 | Method for controlling coiling temperature of milling slab |
| US20140350746A1 (en) * | 2011-12-15 | 2014-11-27 | Posco | Method and Apparatus for Controlling the Strip Temperature of the Rapid Cooling Section of a Continuous Annealing Line |
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| CN111154965A (en) * | 2020-01-06 | 2020-05-15 | 宝钢湛江钢铁有限公司 | Calculation method suitable for strip steel temperature of rapid cooling section of continuous annealing unit |
| CN113637837A (en) * | 2021-08-11 | 2021-11-12 | 宝钢湛江钢铁有限公司 | Horizontal adjusting method for spray process of water mist cooling section of continuous annealing unit by taking control plate shape as target |
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- 2022-09-07 CN CN202211090114.0A patent/CN115961137A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000271626A (en) * | 1999-03-29 | 2000-10-03 | Kawasaki Steel Corp | Method for controlling coiling temperature |
| WO2010083726A1 (en) * | 2009-01-21 | 2010-07-29 | 中冶赛迪工程技术股份有限公司 | Shape control method of hot rolled strip or slab and device thereof |
| KR20110012734A (en) * | 2009-07-31 | 2011-02-09 | 주식회사 포스코 | Method for controlling coiling temperature of milling slab |
| US20140350746A1 (en) * | 2011-12-15 | 2014-11-27 | Posco | Method and Apparatus for Controlling the Strip Temperature of the Rapid Cooling Section of a Continuous Annealing Line |
| CN110184447A (en) * | 2018-02-23 | 2019-08-30 | 宝山钢铁股份有限公司 | A kind of normalizing pickling unit intelligence spray cooling control method |
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| CN113637837A (en) * | 2021-08-11 | 2021-11-12 | 宝钢湛江钢铁有限公司 | Horizontal adjusting method for spray process of water mist cooling section of continuous annealing unit by taking control plate shape as target |
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