CN108277337A - A kind of vertical continuous annealing furnace control method - Google Patents
A kind of vertical continuous annealing furnace control method Download PDFInfo
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- CN108277337A CN108277337A CN201810162362.9A CN201810162362A CN108277337A CN 108277337 A CN108277337 A CN 108277337A CN 201810162362 A CN201810162362 A CN 201810162362A CN 108277337 A CN108277337 A CN 108277337A
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- heating power
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- annealing furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to continuous annealing technical fields, disclose a kind of vertical continuous annealing furnace control method, including：In the case where the practical heating power of annealing furnace bringing-up section and the ratio of design heating power are more than first threshold, using ratio control model；In the case where the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power are less than second threshold, using zonal control pattern；In the case of between the second threshold, described first threshold or both, hysteresis area in order to control；Wherein, the zonal control pattern includes：Combustion fan start-up and shut-down control determines the unlatching quantity of bringing-up section combustion fan according to the ratio of the practical heating power of the annealing furnace bringing-up section and design heating power；Based on the unlatching quantity, the combustion fan for controlling corresponding number in bringing-up section is in running order.The present invention provides a kind of method that can reduce continuous annealing process exhaust gas remaining oxygen.
Description
Technical field
The present invention relates to continuous annealing technical field, more particularly to a kind of vertical continuous annealing furnace control method.
Background technology
Continuous annealing process is with the important component in steel-making process, correspondingly, as its main executing agency
The reliable control of continuous annealing furnace affect the stability of its technique.Wherein, the requirement of environment protection emission is vital one
Ring.
Wherein, discharge exhaust gas in solid particulate matter concentration be weigh whether the important indicator of qualified discharge.Existing row
Put in monitoring program, using comprehensive conversion by the way of, i.e., solid particulate matter converts concentration=coefficient of excess air actual value/sky
Gas coefficient of excess world value × solid particulate matter measured concentration.Wherein, (20.9- is real for coefficient of excess air actual value=20.9/
Oxygen determination content)；Coefficient of excess air world value=20.9/ (20.9-8)=1.6 of coal-burning boiler；That is, described solid
Body particulate matter converts concentration=11.6/ (20.9- surveys oxygen content) × solid particulate matter measured concentration.That is, after conversion
Solid particulate matter concentration and practical particle concentration in exhaust gas are directly related with the remaining oxygen in exhaust gas in exhaust gas.
In the prior art, the bringing-up section combustion control mode of annealing furnace controls for ratio, and wherein total 6 of bringing-up section is combustion-supporting
Wind turbine controls 6 heating regions respectively, and six area powers are consistent always during normal production.But in actual production, empty
Combustion ratio is reduced with the increase of annealing furnace heating load, and corresponding remaining oxygen etc. may also change accordingly, therefore existing ratio
Control mode has adverse effect to the solid particulate matter conversion concentration of discharge.
Invention content
The present invention provides a kind of vertical continuous annealing furnace control method, and the continuous annealing furnace ratio in the prior art that solves controls
Mode has the technical issues of adverse effect to the solid particulate matter conversion concentration of discharge.
In order to solve the above technical problems, the present invention provides a kind of vertical continuous annealing furnace control methods, including：
In the case where the practical heating power of annealing furnace bringing-up section and the ratio of design heating power are more than first threshold,
Using ratio control model；
It is less than the feelings of second threshold in the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power
Under condition, using zonal control pattern；
It is the second threshold, described the in the practical heating power of annealing furnace bringing-up section and the ratio of design heating power
In the case of between one threshold value or both, hysteresis area in order to control；
Wherein, the first threshold is more than the second threshold；
The zonal control pattern includes：
Combustion fan start-up and shut-down control, according to the ratio of the practical heating power of the annealing furnace bringing-up section and design heating power
Value determines the unlatching quantity of bringing-up section combustion fan；
Based on the unlatching quantity, the combustion fan for controlling corresponding number in bringing-up section is in running order.
Further, the first threshold is 50%, second threshold 45%.
Further, in the combustion fan start-up and shut-down control, practical heating power and the design of the annealing furnace bringing-up section
The ratio P of the heating power and unlatching quantity Q of bringing-up section combustion fanFANCorrespondence be：
As P≤15%, QFANValue is 1；
When 15%<When P≤25%, QFANValue is 2；
When 25%<When P≤35%, QFANValue is 3；
When 35%<When P≤45%, QFANValue is 4；
When 45%<When P≤50%, QFANValue is 5；
As P ＞ 50%, QFANValue is 6.
Further, the method further includes：
Pid control parameter is adjusted, according to the ratio of the practical heating power of the annealing furnace bringing-up section and design heating power
Value adjustment P values and I values；
Wherein, pid control parameter adjust in, using with adjust P values and I values by the way of proportionality coefficient product；
Pair of the practical heating power of the annealing furnace bringing-up section and the ratio and the P values and I values of design heating power
Should be related to for：
Further, the pid control parameter, which is adjusted, further includes：
Output compensation when being switched to zonal control pattern by ratio mode, according to combustion fan shutoff operation time x and helps
Fire the rotating speed V before wind turbine is closedFANBringing-up section output power is compensated；
Wherein, the compensating operation executes according to the following formula：
Wherein, PnewpidFor the bringing-up section output power value after compensation, PoldpidFor the bringing-up section output power value before compensation.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
The vertical continuous annealing furnace control method provided in the embodiment of the present application is controlled for existing continuous annealing furnace ratio
Actual measurement solid particulate matter concentration caused by pattern is qualified, but the solid particulate matter conversion concentration over-standard of exhaust gas discharge is this pseudo- super
Target situation, by tracking the output power of bringing-up section, in the case where output power is less than first threshold, using zonal control
Replacement ratio controls, and the actual value for being specifically based on output power determines the unlatching quantity of combustion fan, closes part combustion air
Machine, to adapt to the practical demand for heat of continuous annealing furnace, is avoided excessively with reducing air inlet amount under bringing-up section low power condition
The situation for causing the setting sun amount in exhaust gas excessively high is supplied, it is pseudo- exceeded to solve the problems, such as.
Description of the drawings
Fig. 1 is vertical continuous annealing furnace control method principle schematic provided in an embodiment of the present invention.
Specific implementation mode
The embodiment of the present application solves continuous annealing in the prior art by providing a kind of vertical continuous annealing furnace control method
Stove ratio control mode has the technical issues of adverse effect to the solid particulate matter conversion concentration of discharge.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
It states technical solution to be described in detail, it should be understood that the specific features in the embodiment of the present invention and embodiment are to the application skill
The detailed description of art scheme, rather than to the restriction of technical scheme, in the absence of conflict, the embodiment of the present application
And the technical characteristic in embodiment can be combined with each other.
The present embodiment discharges the solution party of solid particulate matter puppet excessive problem as a kind of exhaust gas for continuous annealing furnace
Case, it is matched using zonal control pattern and original ratio control model by optimizing the control method of continuous annealing furnace
Mode overcomes ratio control model to cause remaining oxygen excessively high, to generate the defect of pseudo- excessive problem.
It will be illustrated by taking the continuous annealing furnace of six combustion fan bringing-up sections as an example below.
A kind of vertical continuous annealing furnace control method, including：
In the case where the practical heating power of annealing furnace bringing-up section and the ratio of design heating power are more than first threshold,
Using ratio control model；
It is less than the feelings of second threshold in the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power
Under condition, using zonal control pattern；
It is the second threshold, described the in the practical heating power of annealing furnace bringing-up section and the ratio of design heating power
In the case of between one threshold value or both, hysteresis area in order to control.
That is, according to the practical condition of continuous annealing furnace, i.e., the practical heating power of annealing furnace bringing-up section with
The ratio of heating power is designed, first threshold, the critical value as the switching than row control model and zonal control pattern are set.
Meanwhile the influence in order to avoid the fluctuation of systematic parameter to handover operation, second threshold of the setting less than first threshold
It is worth, forms control hysteresis area, that is, buffering area between two threshold values.Specifically, execute ratio control during, when than
Value is less than or equal to first threshold, when being more than or equal to second threshold, that is, when in the hysteresis area, still maintains ratio control,
Only when less than second threshold, just switch over；It is similar, during executing zonal control, when ratio is less than or equal to first
Threshold value still maintains zonal control, only when more than the first threshold when being more than or equal to second threshold, that is, when in the hysteresis area
When value, just switch over.
Wherein, the first threshold is more than the second threshold；
The zonal control pattern includes：
Combustion fan start-up and shut-down control, according to the ratio of the practical heating power of the annealing furnace bringing-up section and design heating power
Value determines the unlatching quantity of bringing-up section combustion fan；
Based on the unlatching quantity, the combustion fan for controlling corresponding number in bringing-up section is in running order.
That is, the substantial manipulation of zonal control is, output power situation in actual production process, selectivity are tracked
Closing or open combustion fan.To increase or decrease air inlet, on the one hand ensure the reliability of heating process,
On the other hand, in the case of being also avoided that low output power, the excessively high problem of remaining oxygen excessively in exhaust gas caused by gas supply, to
Avoid the appearance of pseudo- exceeded situation.
Below by taking the continuous annealing furnace including 6 combustion fan bringing-up sections as an example, it is specifically described.Certain actual production
In, there can be more or less combustion fan.
According to actual strip continuous annealing process, the first threshold is 50%, second threshold 45%, and hysteresis area is wide
Degree is 5%.
For the scheme of zonal control parameter, in the combustion fan start-up and shut-down control, the annealing furnace bringing-up section
Practical heating power with design heating power ratio P and bringing-up section combustion fan unlatching quantity QFANCorrespondence be：
As P≤15%, QFANValue is 1；
When 15%<When P≤25%, QFANValue is 2；
When 25%<When P≤35%, QFANValue is 3；
When 35%<When P≤45%, QFANValue is 4；
When 45%<When P≤50%, QFANValue is 5；
As P ＞ 50%, QFANValue is 6.
It is, according to specific combustion fan quantity, by first threshold and its interval division below at multiple outputs
Power control section, the quantity of corresponding combustion fan, the start and stop for controlling combustion fan, to control air inflow number.
It is worth noting that it is specifically in embodiment that above-mentioned first threshold and the practical value of second threshold, which are only one,
Value, with 1700 it is zinc-plated use DREVER annealing furnaces, specific calculating process is：
In order to ensure that solid particulate matter concentration≤15mg/m3 (executes standard and limit value DB13/2169- in exhaust gas after converting
2015), then practical particle concentration needs to meet with the remaining oxygen in exhaust gas in exhaust gas：Solid particulate matter measured concentration≤15
(20.9- surveys oxygen content)/11.6.
Such as need solid particulate matter concentration after ensureing to convert to meet discharge standard, then remaining oxygen in exhaust gas need≤
13.17%.
According to thermic load formula corresponding with actual measurement oxygen content：
F (x)=- 2.16e+04x3+1.417e+04x2-3239x+274.5
Wherein x:For the actual measurement oxygen content of exhaust gas, f (x):Bringing-up section power.
Obtain to be exactly when bringing-up section power is less than 45%, solid particulate matter concentration is more than discharge standard after conversion.Adding
Solid particulate matter concentration complies with standard after conversion when hot arc power >=45%, as second threshold, while hysteresis sector width is arranged
It is 5%, first threshold 50%.
In mode handover procedure, the larger temperature difference is may result in, in order to avoid influence production matter is widely varied in temperature
Amount.
The method further includes：Pid control parameter adjust, according to the practical heating power of the annealing furnace bringing-up section with set
Count the ratio adjustment P values and I values of heating power；Wherein, pid control parameter adjust in, using with by the way of proportionality coefficient product
Adjust P values and I values.It is updated by pid parameter, copes with pattern switching, ensure the stability of output power.
In general, by proportionality coefficient, that is, proportionality coefficient update, the annealing are multiplied by the basis of original parameter
The practical heating power of stove heat section and the ratio and the correspondence of the P values and I values of design heating power are：
Adjustment process itself needs the time, in order to make up the power loss of this process.
The pid control parameter is adjusted：
Output compensation when being switched to zonal control pattern by ratio mode, according to combustion fan shutoff operation time x and helps
Fire the rotating speed V before wind turbine is closedFANBringing-up section output power is compensated.
Wherein, the compensating operation executes according to the following formula：
Wherein, PnewpidFor the bringing-up section output power value after compensation, PoldpidFor the bringing-up section output power value before compensation.
Further, it is however generally that, when closing more combustion fans, typically interval is closed, such as in six combustion fans
It is interior to close three, the 2nd, 4,6 is often closed, without being continuous three, to ensure being evenly heated for bringing-up section.
On the other hand in order to promote the reliability of control model, gaspipe line structure is optimized referring to Fig. 1, is arranged
Automatically controlled valve group is performed in unison with the unlatching of gas safety key and closing, combustion fan is opened and closed when carrying out pattern switching,
Gas piping nitrogen purges and gas piping coal gas replacement nitrogen, realizes seamless switching.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
The vertical continuous annealing furnace control method provided in the embodiment of the present application is controlled for existing continuous annealing furnace ratio
Actual measurement solid particulate matter concentration caused by pattern is qualified, but the solid particulate matter conversion concentration over-standard of exhaust gas discharge is this pseudo- super
Target situation, by tracking the output power of bringing-up section, in the case where output power is less than first threshold, using zonal control
Replacement ratio controls, and the actual value for being specifically based on output power determines the unlatching quantity of combustion fan, closes part combustion air
Machine, to adapt to the practical demand for heat of continuous annealing furnace, is avoided excessively with reducing air inlet amount under bringing-up section low power condition
The situation for causing the setting sun amount in exhaust gas excessively high is supplied, it is pseudo- exceeded to solve the problems, such as.
It should be noted last that the above specific implementation mode is merely illustrative of the technical solution of the present invention and unrestricted,
Although being described the invention in detail with reference to example, it will be understood by those of ordinary skill in the art that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit of the technical scheme of the invention and range, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. a kind of vertical continuous annealing furnace control method, which is characterized in that including：
In the case where the practical heating power of annealing furnace bringing-up section and the ratio of design heating power are more than first threshold, use
Ratio control model；
In the case where the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power are less than second threshold,
Using zonal control pattern；
It is the second threshold, described the in the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power
In the case of between one threshold value or both, hysteresis area in order to control；
Wherein, the first threshold is more than the second threshold；
The zonal control pattern includes：
Combustion fan start-up and shut-down control, it is true according to the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power
Determine the unlatching quantity of bringing-up section combustion fan；
Based on the unlatching quantity, the combustion fan for controlling corresponding number in bringing-up section is in running order.
2. vertical continuous annealing furnace control method as described in claim 1, which is characterized in that the first threshold is 50%,
Second threshold is 45%.
3. vertical continuous annealing furnace control method as described in claim 1, which is characterized in that the combustion fan start-up and shut-down control
In, the unlatching of the practical heating power and the ratio P and bringing-up section combustion fan of design heating power of the annealing furnace bringing-up section
Quantity QFANCorrespondence be：
As P≤15%, QFANValue is 1；
When 15%<When P≤25%, QFANValue is 2；
When 25%<When P≤35%, QFANValue is 3；
When 35%<When P≤45%, QFANValue is 4；
When 45%<When P≤50%, QFANValue is 5；
As P ＞ 50%, QFANValue is 6.
4. such as claims 1 to 3 any one of them vertical continuous annealing furnace control method, which is characterized in that the method is also
Including：
Pid control parameter is adjusted, according to the ratio tune of the practical heating power of the annealing furnace bringing-up section and design heating power
Whole P values and I values；
Wherein, pid control parameter adjust in, using with adjust P values and I values by the way of proportionality coefficient product；
The corresponding pass of the practical heating power of the annealing furnace bringing-up section and the ratio of design heating power and the P values and I values
System is：
5. vertical continuous annealing furnace control method as claimed in claim 4, which is characterized in that the pid control parameter is adjusted
Further include：
Output compensation, when being switched to zonal control pattern by ratio mode, according to combustion fan shutoff operation time x and combustion air
Organ close before rotating speed VFANBringing-up section output power is compensated；
Wherein, the compensating operation executes according to the following formula：
Wherein, PnewpidFor the bringing-up section output power value after compensation, PoldpidFor the bringing-up section output power value before compensation.
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| CN103836642A (en) * | 2014-03-14 | 2014-06-04 | 江南大学 | Method for controlling pulse combustion of multiple burners of fuel gas furnace |
| CN104775022A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Combustion-supporting fan linkage control system and method |
| CN105546572A (en) * | 2016-01-06 | 2016-05-04 | 北京首钢自动化信息技术有限公司 | Automatic control system and method for temperature of combustion section of vertical type annealing furnace |
| CN107245570A (en) * | 2017-07-20 | 2017-10-13 | 山东钢铁集团日照有限公司 | A kind of cold rolled annealed stove heat combination control method |
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2018
- 2018-02-27 CN CN201810162362.9A patent/CN108277337A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296171A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Burner control method varying with heating load |
| CN103261791A (en) * | 2010-12-15 | 2013-08-21 | 庆东纳碧安株式会社 | Gas boiler including output adjusting device, and method of adjusting output of gas boiler |
| CN104775022A (en) * | 2014-01-15 | 2015-07-15 | 宝山钢铁股份有限公司 | Combustion-supporting fan linkage control system and method |
| CN103836642A (en) * | 2014-03-14 | 2014-06-04 | 江南大学 | Method for controlling pulse combustion of multiple burners of fuel gas furnace |
| CN105546572A (en) * | 2016-01-06 | 2016-05-04 | 北京首钢自动化信息技术有限公司 | Automatic control system and method for temperature of combustion section of vertical type annealing furnace |
| CN107245570A (en) * | 2017-07-20 | 2017-10-13 | 山东钢铁集团日照有限公司 | A kind of cold rolled annealed stove heat combination control method |
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Application publication date: 20180713 |