CN115672685B - Method for controlling baking quality of magnesia coating for producing oriented silicon steel - Google Patents
Method for controlling baking quality of magnesia coating for producing oriented silicon steel Download PDFInfo
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- CN115672685B CN115672685B CN202110852462.6A CN202110852462A CN115672685B CN 115672685 B CN115672685 B CN 115672685B CN 202110852462 A CN202110852462 A CN 202110852462A CN 115672685 B CN115672685 B CN 115672685B
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 238000000576 coating method Methods 0.000 title claims abstract description 60
- 239000011248 coating agent Substances 0.000 title claims abstract description 58
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 54
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000003908 quality control method Methods 0.000 claims abstract description 19
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 29
- 238000012937 correction Methods 0.000 claims description 15
- 238000000137 annealing Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000003993 interaction Effects 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract description 22
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000002912 waste gas Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
A baking quality control method for a magnesium oxide coating of oriented silicon steel is characterized in that real-time feedback adjustment of baking output power is established through real-time temperature measurement of strip steel, so that real-time control of baking quality based on the baking output power is formed. According to the baking quality control method for the magnesium oxide coating for producing the oriented silicon steel, disclosed by the invention, the set of online plate thermometer capable of moving in the transverse direction of the strip steel is added above the strip steel at the outlet of the baking furnace, the state of the baking furnace is monitored based on the online plate temperature detection value, and the baking output power control system is built for real-time adjustment, so that the baking quality of the magnesium oxide coating is uniform, the quality stability of an oriented silicon steel product is improved, and the energy consumption is saved.
Description
Technical Field
The invention belongs to the field of drying of magnesium oxide coatings on surfaces of strip steel in the production process of oriented silicon steel, and particularly relates to a baking quality control method of magnesium oxide coatings for producing oriented silicon steel.
Background
The magnesium oxide isolation coating of the oriented silicon steel is a very important process in the production of silicon steel, and the drying process has an important influence on the quality of the finally generated isolation coating, so that strict control on the process is needed in the production process to ensure the quality of the magnesium oxide isolation coating, and the quality of the magnesium oxide coating is a key influence factor influencing the quality and magnetic performance of the bottom layer of the finished oriented silicon steel and is a core technology of the preparation process of the oriented silicon steel. As shown in fig. 1, a magnesium oxide coating section and a coiling section of an annealing unit for producing oriented silicon steel are schematically shown, an oriented silicon steel strip 1 passes through a coating machine 2 at a certain process speed, the coating machine 2 rolls magnesium oxide slurry on the surface of the strip, the strip is dried by a baking furnace 3.1 and then is coiled after being cooled by an air cooling section 4, and the baking quality is adjusted by controlling a baking output power control system 3.2. The excellent magnesium oxide coating quality is a precondition for obtaining an oriented silicon steel product with excellent surface quality and excellent magnetic performance, and serious quality defects can be generated due to insufficient baking or excessive baking. In the existing control of the baking process of the magnesia coating in the oriented silicon steel production, products with the same specification thickness and running speed are controlled by adopting a fixed baking output power control system, so that the baking quality of strip steel cannot be monitored, and the baking quality difference of different positions in the width direction of the strip steel cannot be tracked.
As described above, this infrared baking oven system mainly has the following problems:
(1) The baking output power is manually adjusted according to the average value of the previous roll, and the adjustment accuracy is low;
(2) The baking output power adjustment has obvious lag;
(3) The number of the emitting plates in the baking oven is large, the baking quality difference in the width direction is large when part of the emitting plates are failed, and obvious quality abnormality easily occurs in the subsequent width direction:
(4) The thickness of the magnesium oxide coating changes with the hardness of the coating roller, the thickness of the strip steel and the like. The film thickness of the magnesium oxide coating and the water content of the coating are detected after the production of the steel coil is finished, and the detection time is delayed.
(5) Because the fluctuation of the baking power is large, the baking power is set to be higher and the consumption of natural gas is larger in order to avoid quality defects caused by insufficient baking.
The application number is: the invention application of CN201010282520.8 discloses a method for baking painted steel strip by heating far infrared electric heating tubes and catalytically burning waste gas at low temperature and a catalytic incinerator thereof, wherein painted steel strip is sent into a steel strip baking furnace for baking, and the waste gas in the baking furnace is led into the catalytic incinerator for burning, so that part of the waste gas after the decomposition and oxidation treatment of toxic combustible components in the waste gas is led into the baking furnace for recycling, and the rest is discharged outwards through a heat exchanger, an exhaust fan and a chimney. The method comprises the following two steps: a. arranging 3-4 far infrared electric heating sections in a steel belt baking furnace, and adopting the far infrared electric heating sections for main heating; b. the waste gas in the steel belt baking furnace is pumped out and sent into a low-temperature catalytic incinerator for incineration, an organic waste gas purifying catalyst is arranged in the catalytic incinerator, and far infrared electric heating tubes are used for assisting in heating the waste gas, so that the temperature of the waste gas reaches the ignition temperature of catalytic reaction with the catalyst.
The application number is: the invention application of CN200510019090.X discloses a baking method and a device of a strip steel coating, wherein clean air is heated in a gas/gas heat exchanger by hot flue gas of an incinerator, and the strip steel coating is baked in a baking furnace by the hot air; the waste gas containing solvent generated in the baking furnace during baking the strip steel is sent to another gas/gas heat exchanger, heated by the hot flue gas of the incinerator and then sent to the incinerator for incineration; the hot flue gas discharged from the incinerator is subjected to heat exchange by the two gas/gas heat exchangers and then discharged to the atmosphere. The device comprises a baking furnace, an incinerator, an air/flue gas heat exchanger and an exhaust gas/flue gas heat exchanger which are connected through a pipeline and a fan.
Disclosure of Invention
In order to solve the problems, the invention provides a baking quality control method for a magnesia coating for producing oriented silicon steel, which has the following technical scheme:
a baking quality control method for a magnesia coating for producing oriented silicon steel is characterized by comprising the following steps of:
establishing real-time feedback adjustment of baking output power through real-time temperature measurement of strip steel, thereby forming real-time control of baking quality based on the baking output power;
the real-time temperature measurement of the strip steel specifically comprises the following steps:
s1: a plate thermometer bracket is arranged above the baking outlet, and a plate thermometer capable of reciprocating along the width direction of the strip steel is arranged on the bracket;
s2: driving the plate thermometer to move according to the set motion trail to finish the actual temperature acquisition in one motion period;
s3: calculating according to the acquired actual temperatures in a plurality of movement periods to form a numerical value capable of representing the actual temperature of the current strip steel, wherein the numerical value is used as the actual temperature value of the current strip steel;
the step S2 specifically comprises the following steps:
the method comprises the steps of arranging measurement points of a plate thermometer along the width direction of strip steel, driving the plate thermometer to move to each measurement point according to a set time interval, and completing real-time measurement for a plurality of times within the residence time according to residence time of each measurement point;
the actual temperature value of the current strip steel in the step S3 is determined according to the actual temperature value of each measuring point and the average value of the point number measured in real time.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
the establishment of the real-time feedback adjustment of the baking output power comprises the following specific steps:
and carrying out difference value operation on the measured actual value and the set target value, carrying out correction operation on the output power according to the operation result, and carrying out real-time adjustment on the baking output power according to the correction operation result.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
and the real-time feedback adjustment of the baking output power is performed within the condition of meeting the output power constraint, otherwise, the alarm is not performed and triggered.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
the set target value is set according to an annealing curve.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
after each measuring point completes the real-time measurement for a plurality of times within the residence time according to the residence time of the set time, firstly finding out the measurement maximum value and the measurement minimum value within one period, comparing the difference value of the measurement maximum value and the measurement minimum value with the set threshold value, if the difference value is smaller than or equal to the set threshold value, entering a step S3, otherwise triggering an alarm.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
a feedback control operation unit which can perform information interaction with the data calculation unit is arranged on the process computer,
the feedback control operation unit is used for receiving real-time actual data and completing the calculation of the actual temperature value of the current strip steel according to the receiving.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
the correction operation of the output power is specifically as follows:
P x ＝P (x-1) +c(T target value -T Detection value )(x∈N*)；
Wherein,,
P x : when producing genuine rolls, the output power of baking after adjusting according to the temperature measurement value is as follows: kw;
x: detecting the plate temperature in an x-th period;
P x-1 : baking output power before board temperature detection x-th period correction, unit: kw;
T target value : target temperature value, unit: the temperature is lower than the temperature;
T detection value : real worldMeasurement values, unit: the temperature is lower than the temperature;
c: constant, and c is more than or equal to 5 and less than or equal to 100 kw/DEG C, unit: kw/. Degree.C.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
the initial set value of the baking output power is determined based on the consideration of three dimensional factors of manufacturer design, the set width of the current strip steel and the set running speed of the current strip steel;
the output power constraint condition is set according to the initial set value of the baking output power.
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
the set threshold value is corresponding to the value interval of [5 ℃ and 30 ℃).
The baking quality control method for the magnesia coating of the oriented silicon steel is characterized by comprising the following steps of:
when the output power falls into the interval [0.8P0,3P0], the determination of the output power is completed according to the correction, otherwise, an alarm is triggered.
According to the baking quality control method for the magnesium oxide coating for producing the oriented silicon steel, disclosed by the invention, the set of online plate thermometer capable of moving in the transverse direction of the strip steel is added above the strip steel at the outlet of the baking furnace, the state of the baking furnace is monitored based on the online plate temperature detection value, and the baking output power control system is built for real-time adjustment, so that the baking quality of the magnesium oxide coating is uniform, the quality stability of an oriented silicon steel product is improved, and the energy consumption is saved.
Drawings
FIG. 1 is a schematic view of the structure of the magnesia coating section and the coiling section of the annealing unit in the prior art;
FIG. 2 is a schematic diagram of a real-time temperature measurement step according to the present invention;
FIG. 3 is a schematic view of the structure of the magnesia coating section and the coiling section of the annealing unit in the embodiment of the invention.
In the drawing the view of the figure,
1-silicon steel strip;
2-magnesia coating machine;
3.1-baking oven;
3.2-a bake output power control system;
4-an air cooling section of the silicon steel strip;
5-a coiling machine;
6.1-plate thermometer holder;
6.2-plate thermometer;
6.3-feedback controller.
Detailed Description
The baking quality control method for the magnesia coating for producing the oriented silicon steel is further specifically described below according to the attached drawings and the specific embodiments of the invention.
A baking quality control method for a magnesia coating of oriented silicon steel,
and establishing real-time feedback adjustment of the baking output power through real-time temperature measurement of the strip steel, thereby forming real-time control of the baking quality based on the baking output power.
Wherein, as shown in figure 2,
the real-time temperature measurement of the strip steel specifically comprises the following steps:
s1: a plate thermometer bracket is arranged above the baking outlet, and a plate thermometer capable of reciprocating along the width direction of the strip steel is arranged on the bracket;
s2: driving the plate thermometer to move according to the set motion trail to finish the actual temperature acquisition in one motion period;
s3: and calculating a numerical value capable of representing the actual temperature of the current strip steel according to the acquired actual temperature, and taking the numerical value as the actual temperature value of the current strip steel.
Wherein,,
a feedback control operation unit which can perform information interaction with the data calculation unit is arranged on the process computer,
the feedback control operation unit is used for receiving real-time actual data and completing the calculation of the actual temperature value of the current strip steel according to the receiving.
Wherein,,
the establishment of the real-time feedback adjustment of the baking output power comprises the following specific steps:
and carrying out difference value operation on the measured actual value and the set target value, carrying out correction operation on the output power according to the operation result, and carrying out real-time adjustment on the baking output power according to the correction operation result.
Wherein,,
the correction operation of the output power is specifically as follows:
P x ＝P (x-1) +c(T target value -T Detection value )(x∈N*)；
Wherein,,
P x : when producing genuine rolls, the output power of baking after adjusting according to the temperature measurement value is as follows: kw;
x: detecting the plate temperature in an x-th period;
P x-1 : baking output power before board temperature detection x-th period correction, unit: kw;
T target value : target temperature value, unit: the temperature is lower than the temperature;
T detection value : actual measured value, unit: the temperature is lower than the temperature;
c: constant, and c is more than or equal to 5 and less than or equal to 100 kw/DEG C, unit: kw/. Degree.C.
Wherein,,
the step S2 specifically comprises the following steps:
the method comprises the steps of arranging measurement points of a plate thermometer along the width direction of strip steel, driving the plate thermometer to move to each measurement point according to a set time interval, and completing real-time measurement for a plurality of times within the residence time according to residence time of each measurement point;
the actual temperature value of the current strip in step S3 is determined accordingly from a weighted average of the actual temperature values for each measurement point.
Wherein,,
step S3 is completed according to actual temperature acquisition and calculation in one movement period.
Wherein,,
and step S3, acquiring and calculating according to the actual temperatures in the set movement periods.
Wherein,,
and the real-time feedback adjustment of the baking output power is performed within the condition of meeting the output power constraint, otherwise, the alarm is not performed and triggered.
Wherein,,
the set target value is set according to an annealing curve.
Wherein,,
the actual temperature value of each measuring point is determined according to the average value of the point number measured in real time.
Wherein,,
after each measuring point completes the real-time measurement for a plurality of times within the residence time according to the residence time of the set time, firstly finding out the measurement maximum value and the measurement minimum value within one period, comparing the difference value of the measurement maximum value and the measurement minimum value with the set threshold value, if the difference value is smaller than or equal to the set threshold value, entering a step S3, otherwise triggering an alarm.
Wherein,,
the initial set value of the baking output power is determined based on consideration of three dimensional factors of manufacturer design, the set width of the current strip steel and the set running speed of the current strip steel. The output power constraint condition is set according to the initial set value of the baking output power.
Working principles and examples
An online plate thermometer capable of moving in the transverse direction of the strip steel is additionally arranged above the strip steel at the outlet of the baking furnace, the state of the baking furnace is monitored based on an online plate temperature detection value, and a baking output power control system and a plate temperature relation are established, so that the baking output power control system is adjusted in real time, the baking quality of the magnesia coating is uniform, the quality stability of oriented silicon steel products is improved, and the energy consumption is saved. The specific advantages are as follows:
1. and a plate thermometer capable of moving in the transverse direction of the strip steel is additionally arranged at the outlet of the baking furnace, so that the temperature of the strip steel when the strip steel is discharged out of the baking furnace is monitored in real time. The baking quality of each steel coil in the longitudinal direction is ensured to be stable;
2. the state of the baking furnace is monitored by detecting the temperature of each transverse point of the strip steel;
3. the relation between the baking output power control system and the strip steel temperature is established, the baking quality stability of the magnesia coating is improved by adjusting the baking output power control system in real time, and the natural gas consumption is reduced;
4. the thickness of the magnesium oxide coating changes with the hardness of the coating roller, the thickness of the strip steel and the like. And detecting the temperature of the baked board, adjusting baking power in real time, and ensuring the quality of the magnesia coating.
Specific work is shown in fig. 3, a thermometer bracket 6.1 is arranged at the outlet of the baking furnace, a plate thermometer 6.2 is arranged on the bracket, and the plate thermometer bracket with an electric control system can freely move the plate thermometer in the transverse direction of the strip steel and detect the temperature of each point in the transverse direction of the strip steel.
The points of the control points are as follows:
when producing the non-genuine coil without the magnesia coating liquid, the baking output power is a fixed value, and the fixed value is determined based on the consideration of three dimensional factors of factory design, the set width of the current strip steel and the set running speed of the current strip steel. The following describes a control method for producing a genuine roll coated with a magnesium oxide coating liquid:
initial bake output power:
after the finished product is produced, the baking output power is determined based on the consideration of three dimensional factors of the manufacturer design, the set width of the current strip steel and the set running speed of the current strip steel, and the baking output power is used as an initial set value of the baking output power.
T Detection value Is defined by:
after the silicon steel coated with magnesium oxide is taken out of the baking furnace, a plate thermometer bracket with an electric control system drives the plate thermometer to rotate at a speed v x (0.1m/min≤v x Less than or equal to 10 m/min) to reciprocate in the transverse direction of the silicon steel strip, and detecting the temperature of each point in the transverse direction of the steel strip. The temperature average value of the transverse one period of the silicon steel belt is defined as T after being processed by the feedback controller 6.3 Detection value . When the extremely poor temperature (temperature maximum value-temperature minimum value) is less than or equal to T in 1 detection period 0 (5℃≤T 0 When the temperature is less than or equal to 30 ℃, calculating the average value of the plate temperature of the period, and taking the calculated value as the actual value T of the strip steel Detection value The method comprises the steps of carrying out a first treatment on the surface of the To comprehensively consider actual respectiveThe optimization of the situation and the scheme can also be achieved here by calculating the average value over a set number of cycles and taking this as the actual value of the strip.
The baking furnace state monitoring method comprises the following steps:
when the extremely bad temperature (temperature maximum value-temperature minimum value) is more than T in 1 detection period 0 (5℃≤T 0 When the temperature is less than or equal to 30 ℃, the feedback controller gives an alarm on the picture to remind staff to check the baking furnace equipment;
and alarming when the Px is more than 0.8P0 and less than or equal to 3P 0.
And (3) adjusting baking output power:
and adding a feedback controller 6.3, and transmitting the plate thermometer position and the plate temperature online detection value to the feedback controller. Detecting the temperature of the plate T Detection value The processed signals are input into a baking output power control system through a feedback controller and are controlled by the baking output power control system. The power of the baking oven is according to the formula P x ＝P (x-1) +c(T Target value -T Detection value ) Dynamically adjusting (x epsilon N) on the basis of the original power Px; wherein,,
P x : when producing the genuine roll, adjusting the post baking output power according to the temperature measurement value, wherein the unit is kw (kilowatt);
x: detecting the plate temperature in an x-th period;
P x-1 : the baking output power before the x-th period correction is detected by the plate temperature, and the unit is kw (kilowatt);
T target value : setting according to an annealing curve, wherein the unit is a ℃ (celsius degree);
T detection value : is the actual measurement in degrees Celsius;
c: is constant, and c is more than or equal to 5 and less than or equal to 100 kw/DEG C, and the unit is kw/DEG C.
The baking power abnormality determination has two conditions: 1. is uneven baking of strip steel in transverse direction (when extremely bad temperature (temperature maximum value-temperature minimum value) is more than T in 1 detection period 0 (5℃≤T 0 At less than or equal to 30 ℃); 2. the baking power is abnormally lower or higher (0.8P0 is less than or equal to Px is less than or equal to 3P 0).
Baking output power control systemIs characterized by comprising the following steps: and adding a feedback controller, and transmitting the plate thermometer position and the plate temperature online detection value to the feedback controller. Detecting the temperature of the plate T Detection value The processed signals are input into a baking output power control system through a feedback controller and are controlled by the baking output power control system.
A specific embodiment according to the above principle is as follows (actual values in this embodiment are calculated in one cycle):
as shown in fig. 3, a strip steel 1 is coated with a magnesia coating with a certain thickness by a magnesia coating machine 2, is dried by a baking furnace 3.1, a plate thermometer bracket 6.1 provided with an electric control system is arranged at the outlet of the baking furnace, a plate thermometer 6.2 is arranged on the bracket, and then a silicon steel strip is coiled 5 after being cooled by an air cooling section 4. Wherein the plate thermometer detection equipment and the baking output power control system are both connected to the feedback controller 6.3, and the baking output power control system 3.2 adjusts the baking output power control system in real time based on the plate temperature value output by the feedback controller 6.3.
Before the strip steel enters the baking furnace, setting initial output power based on the consideration of three dimensional factors of factory design, the set width of the current strip steel and the set running speed of the current strip steel;
after the silicon steel coated with magnesium oxide is taken out of the baking furnace, a plate thermometer bracket with an electric control system drives the plate thermometer to rotate at a speed v x (0.1m/min≤v x At a speed of less than or equal to 10 m/min) to reciprocate in the transverse direction of the silicon steel strip, and detecting the temperature of each point in the transverse direction of the steel strip. When the extremely poor temperature (temperature maximum value-temperature minimum value) is less than or equal to T in 1 detection period 0 (T 0 Is an empirical value and is less than or equal to 5 ℃ and less than or equal to T 0 When the temperature is less than or equal to 30 ℃, calculating the average value T of the plate temperature in the period Detection value . The online detection value is transmitted to a feedback controller, and the board temperature detection value T is transmitted to a control circuit Detection value And target board temperature T Target value Comparing, wherein the feedback controller requires the baking output power to be according to a formula P x ＝P (x-1) +c(T Target value -T Detection value ) And dynamically adjusting the power Px based on the original power Px.
When the extremely bad temperature (temperature maximum value-temperature minimum value) is more than T in 1 detection period 0 (5℃≤T 0 And when the temperature is less than or equal to 30 ℃, the feedback controller gives an alarm on a picture to remind staff to check baking furnace equipment, and when the temperature exceeds the range of 0.8P0 and Px and is less than or equal to 3P0, the alarm is given.
According to the invention, a plate thermometer bracket and a plate thermometer with an electric control system are added behind the baking furnace, so that transverse plate temperature data of the silicon steel belt can be detected, the baking quality of the magnesium oxide coating on the surface of the silicon steel belt is detected according to the plate temperature data, and a baking output power control system is controlled according to the plate temperature detection value. Compared with the baking output power control, the control method of the plate temperature control is adopted, the baking power qualification rate of the magnesia coating is improved to 99.3 percent from 91.1 percent, the water content of the coating is improved to 100.0 percent from 97.0 percent, the plate temperature average value after baking is reduced by 21.7 ℃, the plate temperature standard deviation is reduced to 3.1 ℃ from 9.7 ℃, the baking power average value is reduced by 5.4 percent, the natural gas consumption is reduced by 3.3 percent, and the abnormal recognition rate of baking equipment in production is 100 percent. The drying quality of the magnesia coating in the production of the oriented silicon steel is obviously improved, the consumption of natural gas is reduced, and the quality stability of the oriented silicon steel product is further improved.
According to the baking quality control method for the magnesium oxide coating for producing the oriented silicon steel, disclosed by the invention, the set of online plate thermometer capable of moving in the transverse direction of the strip steel is added above the strip steel at the outlet of the baking furnace, the state of the baking furnace is monitored based on the online plate temperature detection value, and the baking output power control system is built for real-time adjustment, so that the baking quality of the magnesium oxide coating is uniform, the quality stability of an oriented silicon steel product is improved, and the energy consumption is saved.
Claims (5)
1. A baking quality control method for a magnesia coating for producing oriented silicon steel is characterized by comprising the following steps of:
establishing real-time feedback adjustment of baking output power through real-time temperature measurement of strip steel, thereby forming real-time control of baking quality based on the baking output power;
the real-time temperature measurement of the strip steel specifically comprises the following steps:
s1: a plate thermometer bracket is arranged above the baking outlet, and a plate thermometer capable of reciprocating along the width direction of the strip steel is arranged on the bracket;
s2: driving the plate thermometer to move according to the set motion trail to finish the actual temperature acquisition in one motion period;
s3: calculating according to the acquired actual temperatures in a plurality of movement periods to form a numerical value capable of representing the actual temperature of the current strip steel, wherein the numerical value is used as the actual temperature value of the current strip steel;
the step S2 specifically comprises the following steps:
the method comprises the steps of arranging measurement points of a plate thermometer along the width direction of strip steel, driving the plate thermometer to move to each measurement point according to a set time interval, and completing real-time measurement for a plurality of times within the residence time according to residence time of each measurement point; the actual temperature value of each measuring point is determined according to the average value of the point number measured in real time;
the actual temperature value of the current strip steel in the step S3 is determined according to the average value of the actual temperature values of each measuring point;
the establishment of the real-time feedback adjustment of the baking output power comprises the following specific steps:
performing difference operation on the measured actual value and the set target value, performing correction operation on the output power according to the operation result, and performing real-time adjustment on the baking output power according to the correction operation result, wherein the corresponding expression is as follows:
correction operation of output power:
P x ＝P (x-1) +c(T target value -T Detection value )(x∈N*)；
Wherein,,
P x : when producing genuine rolls, the output power of baking after adjusting according to the temperature measurement value is as follows: kw;
x: detecting the plate temperature in an x-th period;
P x-1 : baking output power before board temperature detection x-th period correction, unit: kw;
T target value : target temperature value, unit: the temperature is lower than the temperature;
T detection value : actual measured value, unit: the temperature is lower than the temperature;
c: constant, and c is more than or equal to 5 and less than or equal to 100 kw/DEG C, unit: kw/. Degree.C.
2. The method for controlling baking quality of a magnesia coating for producing oriented silicon steel according to claim 1, which is characterized in that:
the real-time feedback adjustment of the baking output power completes the determination of the output power according to the correction when the output power falls into a section [0.8P0,3P0], otherwise, an alarm is triggered.
3. The method for controlling baking quality of a magnesia coating for producing oriented silicon steel according to claim 1, which is characterized in that:
the set target value is set according to an annealing curve.
4. The method for controlling baking quality of a magnesia coating for producing oriented silicon steel according to claim 1, which is characterized in that:
in the step S2 of the process,
after each measuring point completes the real-time measurement for a plurality of times within the residence time according to the residence time of the set time, firstly finding out the measurement maximum value and the measurement minimum value within one period, comparing the difference value of the measurement maximum value and the measurement minimum value with the set threshold value, if the difference value is smaller than or equal to the set threshold value, entering a step S3, otherwise triggering an alarm;
the set threshold value is corresponding to the value interval of [5 ℃ and 30 ℃).
5. The method for controlling baking quality of a magnesia coating for producing oriented silicon steel according to claim 1, which is characterized in that:
a feedback control operation unit which can perform information interaction with the data calculation unit is arranged on the process computer,
the feedback control operation unit is used for receiving real-time actual data and completing the calculation of the actual temperature value of the current strip steel according to the receiving.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061372A (en) * | 1989-11-21 | 1992-05-27 | 东芝机械株式会社 | Sheet material thermometry and equipment |
| TWI599656B (en) * | 2016-05-19 | 2017-09-21 | 中國鋼鐵股份有限公司 | Steel hot rolling system and temperature controlling method thereof |
| CN109883170A (en) * | 2018-11-06 | 2019-06-14 | 邯郸钢铁集团有限责任公司 | A kind of Electro-galvanizing Production Line resistance and fingerprint resistance drying oven control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015118606A1 (en) * | 2014-02-04 | 2015-08-13 | 東芝三菱電機産業システム株式会社 | Temperature control unit of hot-rolling machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061372A (en) * | 1989-11-21 | 1992-05-27 | 东芝机械株式会社 | Sheet material thermometry and equipment |
| TWI599656B (en) * | 2016-05-19 | 2017-09-21 | 中國鋼鐵股份有限公司 | Steel hot rolling system and temperature controlling method thereof |
| CN109883170A (en) * | 2018-11-06 | 2019-06-14 | 邯郸钢铁集团有限责任公司 | A kind of Electro-galvanizing Production Line resistance and fingerprint resistance drying oven control method |
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