CN104962727A - Continuous annealing furnace heating section furnace-temperature control system and method - Google Patents
Continuous annealing furnace heating section furnace-temperature control system and method Download PDFInfo
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Abstract
The invention provides a continuous annealing furnace heating section furnace-temperature control system and method. The method comprises the following steps: a basic automatic facility controls and regulates the furnace temperature, and continuously transmits a first working condition message of working condition information in the annealing furnace, which is collected in real time by an on-site device, to a process control facility; a production process execution management facility acquires production line state information of a steel strip in the heating section during processing, generates a second working condition message on such basis, and continuously transmits the second working condition message to the process control facility; and the process control facility receives and analyzes the messages, and resets the heating section furnace temperature value and forms a furnace control message transmitted to the basic automatic facility when the difference between the steel strip actual temperature acquired according to the in-furnace working condition information and production line state information and the preset steel strip target temperature exceeds the set range, thereby controlling the furnace temperature. The method can control and regulate the furnace temperature in time when the steel strip specification changes, and can smoothly transit various change conditions, thereby enhancing the productivity and yield of the steel strip and saving the cost.
Description
Technical field
The present invention relates to continuous annealing furnace technology, particularly relate to continuous annealing furnace heating zone Control for Kiln Temperature technology.
Background technology
Continuous annealing furnace heat treatment process efficiency is very high, and it is used for the band steel that production tension stress intensity is large and plasticity is strong.For the manufacturing and designing of continuous annealing furnace unit, domesticly substantially be in inlet condition, according to the development trend of the maximization of modern times band steel continuous annealing unit, product diversification, high quality and low cost, for continuous annealing unit modeling and calculate the design of machine automatic control system, especially the modeling of continuous annealing furnace and optimal control are the technology of domestic urgently R & D design.Continuous strip annealing furnace has following characteristic, and continuous annealing furnace is generally divided into the multistages such as preheating section, heating zone, soaking zone, and segmentation is many and each section of heat transfer characteristic is almost completely different, stove useful length overlength.In addition, due to the often change such as strip steel specification, heat treatment cycle, tape running speed, make the working of a furnace unstable, stove thermal inertia time is much larger than the band residence time of steel in stove.To sum up, furnace temperature disturbance can be there is in continuous annealing furnace in operational process, or due to band steel just plant, the change of size etc., the furnace temperature when being with steel to produce on a production line is also not suitable for this band steel, and furnace temperature for band steel fine distinction will make be with steel quality produce bigger difference, therefore, should this deviation of furnace temperature be monitored and be adjusted, thus produce high-quality band steel.
Summary of the invention
Object to be solved by this invention is a kind of continuous annealing furnace heating zone Furnace Temperature Control System and method, operating mode when running continuous annealing furnace is monitored, and the operating mode of band steel annealing process is controlled, it is special in strip steel specification converts, timely regulating and controlling furnace temperature, can the various change situation of transition more reposefully, band steel productivity, lumber recovery are improved, saves cost.
For solving the problem, the present invention proposes a kind of continuous annealing furnace heating zone Furnace Temperature Control System, comprising: basic automatization equipment, process control equipment, and production process performs management equipment; Wherein,
Basic automatization equipment connection controls the field device of annealing inner operating, the stove that receiving course operating device issues controls message with regulating and controlling furnace temperature, and continues the first operating mode message of work information in the annealing furnace of process control equipment transmission field device Real-time Collection;
Production process performs management equipment acquisition band steel and in heating zone, adds the production line status information in man-hour and generate the second operating mode message according to this, and continues to send this second operating mode message to process control equipment;
Process control equipment receives and resolves described first operating mode message and the second operating mode message, when the deviation at every turn existed between the band steel actual temperature obtained according to inner operating information and production line status information and the band steel target temperature of setting exceeds setting range, all reset heating zone furnace temperature value and form stove and control message and send to basic automatization equipment thus control furnace temperature.
According to one embodiment of present invention, in described annealing furnace, work information comprises furnace temperature, production line transfer rate in stove, furnace pressure, belt steel temperature.
According to one embodiment of present invention, production line status information comprises annealing curve, and following combination several arbitrarily: strip length, strip width, belt steel thickness, band steel density, band steel steel grade.
For solving the problem, the present invention also proposes a kind of continuous annealing furnace heating zone method for controlling furnace temperature, and basic automatization equipment forms the first operating mode message according to work information in the annealing furnace of field device Real-time Collection and continues to send it to process control equipment; Production process performs management equipment acquisition band steel and in heating zone, adds the production line status information in man-hour and form the second operating mode message and continue to send it to process control equipment; The method comprises:
Step S1: the annealing curve that process control equipment performs management equipment transmission according to production process carries out initialize, to each branch furnace temperature value initialize of heating zone, furnace temperature value sends to basic automatization equipment to control furnace temperature by process control equipment, enters step S2;
Step S2: process control equipment is in message accepting state, if receive the first operating mode message and/or the second operating mode message, enters step S3;
Step S3: process control equipment carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature, the target effective heat energy value of effective heat energy end value and setting is compared, if the deviation that effectively heat energy end value and target effective heat energy value exist exceeds setting range, then enter step S4, otherwise return execution step S2;
Step S4: the furnace temperature value resetting each branch of heating zone according to effective heat energy end value, process control equipment forms stove control message according to the furnace temperature value of setting and sends to basic automatization equipment thus regulating and controlling furnace temperature, returns execution step S2 and reduces the deviation of effective heat energy end value and the existence of target effective heat energy value with adjusting furnace temperature by iterative manner.
According to one embodiment of present invention, described heating zone is divided at least three pairs of heating zone, and often pair of heating zone will do not had to be divided into several branches.
According to one embodiment of present invention, the method for the furnace temperature value of the process control equipment setting each branch of heating zone comprises:
The entry value of the first branch of the first heating zone is set to the assignment set by process control equipment, export value is set to its entry value and adds dt; The entry value of the second branch of the first heating zone is set to the export value of the first branch of the first heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The entry value entry value of the first branch of the second heating zone being set to the first branch of the first heating zone adds the step-length of two heating intervals set in annealing curve, export value is set to its entry value and adds dt; The entry value of the second branch of the second heating zone is set to the export value of the first branch of the second heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The rest may be inferred in heating zone after second heating zone;
Wherein
To is band steel exports temperature; Ti is band steel temperature in; Elements is branch's number summation of all heating zone.
According to one embodiment of present invention, in step sl, be close to house temperature by the entry value Initialize installation of the first branch of the first heating zone.
According to one embodiment of present invention, in step s3, the formula that process control equipment carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature is
Wherein, y is effective heat energy end value, m_flow is band steel flow, enth (to) is the heat content under band steel exports temperature to, enth (ti) is the heat content under band steel temperature in ti, STEFAN is that Si Difen-Bo grows graceful constant, and fact is radiation coefficient, and surf is swept area.
According to one embodiment of present invention, in step s 4 which, the method resetting the furnace temperature value of each branch of heating zone according to effective heat energy end value is
If y<0, tr=to, otherwise
Wherein, tr is in order to arrange the assignment set by the process control equipment of the entry value of the first branch of the first heating zone.
According to one embodiment of present invention, basic automatization equipment determines band steel exports temperature according to the thermal conduction formula of heating zone, and formula is as follows:
σ
0·φ·S·(TF
4-TB
4)＝v·t·w·ρ·C·(TBE-TBI)
Wherein, TF is heating zone furnace temperature, and TB is belt steel temperature, σ
0for Si Difen-Bo grows graceful constant, φ is radiation coefficient, and S is heat exchange area, and v is production line transfer rate in stove, and t is belt steel thickness, and C is thermal capacitance, and ρ is band steel density, and TBE, TBI are respectively heating zone heat conducting band steel exports temperature and band steel temperature in.
After adopting technique scheme, the present invention has following beneficial effect compared to existing technology: by the operating mode in basic automatization device real-time monitoring annealing furnace, and constantly work information is sent to process control equipment with message form, and, production line status information when management equipment monitoring band steel is produced on a production line is performed by production process, and constantly production line status information is sent to process control equipment with message information, process control equipment can monitor the operating mode under annealing furnace all working state on the one hand, situation when ad hoc producing band steel is on the other hand monitored, in the firm kind of band steel, when the situations such as size change, and when making to be with the deviation existed between steel actual temperature and the band steel target temperature of setting to exceed setting range, by (process control equipment and the basic automatization equipment of iterating, production process performs the repeatedly information interaction between management) control furnace temperature deviation is constantly reduced, thus realize the smooth transition of the furnace temperature when being with steel conversion.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the continuous annealing furnace heating zone Furnace Temperature Control System of one embodiment of the invention;
Fig. 2 is the schematic flow sheet of the continuous annealing furnace heating zone method for controlling furnace temperature of one embodiment of the invention;
Fig. 3 is the structural representation of the continuous annealing furnace heating zone of one embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public concrete enforcement.
Continuous annealing furnace of the present invention divides and such as comprises preheating section, heating zone and soaking zone.
Preheating section is that the waste gas produced after being burnt by heating zone heats hydrogen nitrogen hybrid protection gas by heat exchanger and carries out thermal conduction heating, and protection gas fully contacts with being with steel, can blow belt steel surface off and to swim impurity, play the effect of heating zone steel simultaneously.The belt steel temperature of preheating section outlet can reach 120 ~ 150 DEG C, greatly reduces the temperature difference between heating zone first deflector roll and band steel simultaneously, is conducive to the band correction of steel and the recycling of the energy.
Heating zone and soaking zone are radiator tube heating, ensure to be with steel not oxidized in continuous annealing process.Thermal process in the heating zone of continuous annealing furnace, the stove of soaking zone is divided into burning, heat transfer and furnace gases flowing towa taud.Combustion processes mainly discharges the chemical heat for furnace burner fuel in stove; Heat transfer process be then fuel chemical heat by radiator tube radiation delivery give band steel with reach band steel required by target temperature, heat transfer is mainly carried out with radiant exchange and convective heat exchange two kinds of modes, heating zone heat transfer is mainly based on radiant exchange, and convective heat exchange is auxiliary.The belt steel temperature of soaking zone is roughly consistent with stove district temperature, this is also the determinative of production different varieties band steel, and in the annealing curve that production process execution management equipment 3 issues also is the set(ting)value (set(ting)value of Ye Shilu district temperature) of the belt steel temperature to this region.
The control of the present invention to the heating zone furnace temperature of continuous annealing furnace controls for the Control for Kiln Temperature two kinds of situations when Control for Kiln Temperature under normarzing annealing condition and the attribute change of band steel.Controlling furnace temperature makes deviation constantly reduce, thus realizes the smooth transition of the furnace temperature when being with steel conversion.Below the present invention is described in detail.
Referring to Fig. 1, in the present embodiment, continuous annealing furnace heating zone Furnace Temperature Control System comprises: basic automatization equipment 1, process control equipment 2, and production process performs management equipment 3.
Wherein, basic automatization equipment 1 is directly connected with all kinds of device in scene as lower computer, such as transmitter, performer, recording meter, combustion unit etc., the stove that basic automatization equipment 1 receiving course operating device 3 sends controls message D3 and (comprises furnace temperature with regulating and controlling annealing furnace operating mode, strip speed, furnace pressure etc.), what especially control in the present invention is furnace temperature, basic automatization equipment 1 is to process control equipment 2 characteristic data sending field device and the real time data collected, in other words, basic automatization equipment 1 continues the first operating mode message D1 of work information in the annealing furnace of process control equipment transmission field device Real-time Collection, work information in annealing furnace is contained in first operating mode message D1, in annealing furnace, work information such as can comprise furnace temperature, production line transfer rate in stove, furnace pressure, belt steel temperature.
Production process performs management equipment 3 (only managing in process of production) and obtains the production line status information being with steel to add man-hour in heating zone, certainly can obtain from the database stored, also can obtain by other means, and generate the second operating mode message D2 according to this, and continue to send this second operating mode message D2 to process control equipment 2, production line status information is contained in second operating mode message D2, production line status information such as can comprise annealing curve, and following combination several arbitrarily: strip length, strip width, belt steel thickness, band steel density, band steel steel grade.
Process control equipment 2 is as upper computer, industrial computer and HMI (HumanMachine Interface can be adopted, human-computer interaction interface), complete display operation, setup algorithm, control loop configuration and parameter modification, optimizing process process, realize the real-time monitoring of annealing process.Process control equipment is used for receiving and resolves the first operating mode message D1 and the second operating mode message D2, the band steel actual temperature obtained according to inner operating information and production line status information and the band steel target temperature of setting, when being with the deviation existed between steel actual temperature and the band steel target temperature of setting to exceed setting range, reset heating zone furnace temperature value and form stove control message and send to basic automatization equipment 1 thus control furnace temperature, and, basic automatization equipment 1 and production process perform management equipment 3 and send the first operating mode message D1 to process control equipment 2 and the second operating mode message D2 continues to carry out, process control equipment 2 sends stove control message to production process execution management equipment 3 also to be continued to carry out, the Control for Kiln Temperature of heating zone is utilized to realize band temperature, the temperature difference of itself and expected value is made to reach minimum, because furnace temperature is used for adjustment belt temperature, and band temperature changes and needs to feed back to process control equipment 2 and reset furnace temperature, therefore basic automatization equipment 1, it is repeatedly mutual that production process performs between management equipment 3 and process control equipment 2, by successive ignition, the temperature difference is restrained, thus be adjusted to suitable band temperature.
Fig. 2 shows continuous annealing furnace heating zone method for controlling furnace temperature of the present invention, and the Controlling System shown in Fig. 1 can be adopted to realize present method.Basic automatization equipment 1 forms the first operating mode message D1 according to work information in the annealing furnace of field device Real-time Collection and continues to send it to process control equipment 2; Production process performs management equipment 3 acquisition band steel and in heating zone, adds the production line status information in man-hour and form the second operating mode message D2 and continue to send it to process control equipment 2; The method comprises:
Step S1: the annealing curve that process control equipment performs management equipment transmission according to production process carries out initialize, to each branch furnace temperature value initialize of heating zone, furnace temperature value sends to basic automatization equipment to control furnace temperature by process control equipment, enters step S2;
Step S2: process control equipment is in message accepting state, if receive the first operating mode message and/or the second operating mode message, enters step S3;
Step S3: process control equipment carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature, the target effective heat energy value of effective heat energy end value and setting is compared, if the deviation that effectively heat energy end value and target effective heat energy value exist exceeds setting range, then enter step S4, otherwise return execution step S2;
Step S4: the furnace temperature value resetting each branch of heating zone according to effective heat energy end value, process control equipment forms stove control message according to the furnace temperature value of setting and sends to basic automatization equipment thus regulating and controlling furnace temperature, returns execution step S2 and reduces the deviation of effective heat energy end value and the existence of target effective heat energy value with adjusting furnace temperature by iterative manner.
Heating zone can be divided at least three pairs of heating zone, and often pair of heating zone will do not had to be divided into several branches.Referring to Fig. 3, in the present embodiment, heating zone is divided into 3 pairs of heating zone, and wherein, the first heating zone is more divided into 5 branches, and the second heating zone is divided into 4 branches, and the 3rd heating zone is divided into 3 branches.
The method that process control equipment 2 sets the furnace temperature value of each branch of heating zone comprises:
The entry value of the first branch of the first heating zone is set to the assignment set by process control equipment, export value is set to its entry value and adds dt; The entry value of the second branch of the first heating zone is set to the export value of the first branch of the first heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The entry value entry value of the first branch of the second heating zone being set to the first branch of the first heating zone adds the step-length of two heating intervals set in annealing curve, export value is set to its entry value and adds dt; The entry value of the second branch of the second heating zone is set to the export value of the first branch of the second heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The rest may be inferred in heating zone after second heating zone;
Wherein
To is band steel exports temperature; Ti is band steel temperature in; Elements is branch's number summation of all heating zone.
Concrete, continue referring to Fig. 2, in step sl, the entry value of the first branch of the first heating zone is set to be set to its entry value add dt close to house temperature, export value; The entry value of the second branch of the first heating zone is set to the export value of the first branch of the first heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone; The entry value entry value of the first branch of the second heating zone being set to the first branch of the first heating zone adds the step-length of two heating intervals set in annealing curve, export value is set to its entry value and adds dt; The entry value of the second branch of the second heating zone is set to the export value of the first branch of the second heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone; The rest may be inferred in heating zone after second heating zone.
In step s 2, process control equipment 2 enters in wait-receiving mode message pattern, as long as basic automatization equipment 1, production process execution management equipment 3 sends message and comes just to receive, when receiving the second operating mode message D2, the production sequence of coil of strip is also determined after carrying out packet parsing, calculate coil of strip and estimate the welding moment, and judge whether production status changes, this production status refers to whether the attribute of coil of strip creates change, if change, need to recalculate in coil of strip sequence and be with steel target temperature, coil of strip is arranged to enter on production line, be convenient to produce according to coil of strip specification, process control equipment 2 triggers Control for Kiln Temperature pattern after receiving arbitrary message.
In step s3, the formula that process control equipment 2 carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature is
Wherein, y is effective heat energy end value, m_flow is band steel flow, enth (to) is the heat content under band steel exports temperature to, enth (ti) is the heat content under band steel temperature in ti, STEFAN is that Si Difen-Bo grows graceful constant, and fact is radiation coefficient, and surf is swept area.
If effectively heat energy value can not make be with steel actual temperature and be with the temperature deviation of steel target temperature within the specific limits, so need to reset furnace temperature value, thus control cincture steel actual temperature adjusts further again, deviation and deviation range all can make physical condition and determine.
In step s 4 which, if reset the method for the furnace temperature value of each branch of heating zone according to effective heat energy end value for y<0, tr=to, otherwise
wherein, tr is in order to arrange the assignment set by the process control equipment of the entry value of the first branch of the first heating zone.The entry value of the first branch of the first heating zone is set to tr, export value is set to its entry value and adds dt; The entry value of the second branch of the first heating zone is set to the export value of the first branch of the first heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone; The entry value entry value of the first branch of the second heating zone being set to the first branch of the first heating zone adds the step-length of two heating intervals set in annealing curve, export value is set to its entry value and adds dt; The entry value of the second branch of the second heating zone is set to the export value of the first branch of the second heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone; The rest may be inferred in heating zone after second heating zone.
Basic automatization equipment 1 determines band steel exports temperature according to the thermal conduction formula of heating zone, and formula is as follows:
σ
0·φ·S·(TF
4-TB
4)＝v·t·w·ρ·C·(TBE-TBI)
Wherein, TF is heating zone furnace temperature, and TB is belt steel temperature, σ
0for Si Difen-Bo grows graceful constant, φ is radiation coefficient, and S is heat exchange area, and v is production line transfer rate in stove, and t is belt steel thickness, and C is thermal capacitance, and ρ is band steel density, and TBE, TBI are respectively heating zone heat conducting band steel exports temperature and band steel temperature in.Heating zone thermal conduction relies on band steel and the temperature difference of furnace temperature and thickness, width, density etc., heating section strip steel temperature in and perform temperature level difference in the message that management equipment 3 sends and some velocity informations by production process.
The thermal conduction formula of soaking zone is a linear formula due to its heat conducting singularity, as follows:
TFS=a*tbs+b+c*lsd+d*width, determines the furnace temperature of soaking zone thus;
Wherein: a, b, c, d model calculated factor, tbs is the length of band steel, and lsd is the width of band steel, and width is the thickness of band steel.
The present invention performs the annealing curve requirement of management equipment 3 transmission by band steel its data and production process, corresponding stove district desired temperature can be calculated, and send to basic automatization equipment 1 by this set(ting)value of process control equipment 2 in the mode of message, again by PID (the proportion integration differentiation of basic automatization equipment 1, proportion integration differentiation) controller implementation closed-loop control, reach required target.When coil of strip data variation, when the state in stove district has to change before and after weld seam exactly, make its smooth transition.
Although the present invention with preferred embodiment openly as above; but it is not for limiting claim; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible variation and amendment, the scope that therefore protection scope of the present invention should define with the claims in the present invention is as the criterion.
Claims (10)
1. a continuous annealing furnace heating zone Furnace Temperature Control System, is characterized in that, comprising: basic automatization equipment, process control equipment, and production process performs management equipment; Wherein,
Basic automatization equipment connection controls the field device of annealing inner operating, the stove that receiving course operating device issues controls message with regulating and controlling furnace temperature, and continues the first operating mode message of work information in the annealing furnace of process control equipment transmission field device Real-time Collection;
Production process performs management equipment acquisition band steel and in heating zone, adds the production line status information in man-hour and generate the second operating mode message according to this, and continues to send this second operating mode message to process control equipment;
Process control equipment receives and resolves described first operating mode message and the second operating mode message, when the deviation at every turn existed between the band steel actual temperature obtained according to inner operating information and production line status information and the band steel target temperature of setting exceeds setting range, all reset heating zone furnace temperature value and form stove and control message and send to basic automatization equipment thus control furnace temperature.
2. continuous annealing furnace heating zone Furnace Temperature Control System as claimed in claim 1, it is characterized in that, in described annealing furnace, work information comprises furnace temperature, production line transfer rate in stove, furnace pressure, belt steel temperature.
3. continuous annealing furnace heating zone Furnace Temperature Control System as claimed in claim 1, it is characterized in that, production line status information comprises annealing curve, and following combination several arbitrarily: strip length, strip width, belt steel thickness, band steel density, band steel steel grade.
4. a continuous annealing furnace heating zone method for controlling furnace temperature, is characterized in that, basic automatization equipment forms the first operating mode message according to work information in the annealing furnace of field device Real-time Collection and continues to send it to process control equipment; Production process performs management equipment acquisition band steel and in heating zone, adds the production line status information in man-hour and form the second operating mode message and continue to send it to process control equipment; The method comprises:
Step S1: the annealing curve that process control equipment performs management equipment transmission according to production process carries out initialize, to each branch furnace temperature value initialize of heating zone, furnace temperature value sends to basic automatization equipment to control furnace temperature by process control equipment, enters step S2;
Step S2: process control equipment is in message accepting state, if receive the first operating mode message and/or the second operating mode message, enters step S3;
Step S3: process control equipment carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature, the target effective heat energy value of effective heat energy end value and setting is compared, if the deviation that effectively heat energy end value and target effective heat energy value exist exceeds setting range, then enter step S4, otherwise return execution step S2;
Step S4: the furnace temperature value resetting each branch of heating zone according to effective heat energy end value, process control equipment forms stove control message according to the furnace temperature value of setting and sends to basic automatization equipment thus regulating and controlling furnace temperature, returns execution step S2 and reduces the deviation of effective heat energy end value and the existence of target effective heat energy value with adjusting furnace temperature by iterative manner.
5. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 4, it is characterized in that, described heating zone is divided at least three pairs of heating zone, and often pair of heating zone will do not had to be divided into several branches.
6. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 5, is characterized in that, the method for the furnace temperature value of the process control equipment setting each branch of heating zone comprises:
The entry value of the first branch of the first heating zone is set to the assignment set by process control equipment, export value is set to its entry value and adds dt; The entry value of the second branch of the first heating zone is set to the export value of the first branch of the first heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The entry value entry value of the first branch of the second heating zone being set to the first branch of the first heating zone adds the step-length of two heating intervals set in annealing curve, export value is set to its entry value and adds dt; The entry value of the second branch of the second heating zone is set to the export value of the first branch of the second heating zone, entry value that export value is set to the second branch adds dt; The rest may be inferred in the follow-up branch of the first heating zone;
The rest may be inferred in heating zone after second heating zone;
Wherein
To is band steel exports temperature; Ti is band steel temperature in; Elements is branch's number summation of all heating zone.
7. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 6, it is characterized in that, in step sl, be close to house temperature by the entry value Initialize installation of the first branch of the first heating zone.
8. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 6, is characterized in that, in step s3, the formula that process control equipment carries out effective heat energy calculating according to the band steel temperature in work information in annealing furnace and band steel exports temperature is
Wherein, y is effective heat energy end value, m_flow is band steel flow, enth (to) is the heat content under band steel exports temperature to, enth (ti) is the heat content under band steel temperature in ti, STEFAN is that Si Difen-Bo grows graceful constant, and fact is radiation coefficient, and surf is swept area.
9. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 8, it is characterized in that, in step s 4 which, the method resetting the furnace temperature value of each branch of heating zone according to effective heat energy end value is
If y<0, tr=to, otherwise
Wherein, tr is in order to arrange the assignment set by the process control equipment of the entry value of the first branch of the first heating zone.
10. continuous annealing furnace heating zone method for controlling furnace temperature as claimed in claim 4, is characterized in that, basic automatization equipment determines band steel exports temperature according to the thermal conduction formula of heating zone, and formula is as follows:
σ
0·φ·S·(TF
4-TB
4)＝v·t·w·ρ·C·(TBE-TBI)
Wherein, TF is heating zone furnace temperature, and TB is belt steel temperature, σ
0for Si Difen-Bo grows graceful constant, φ is radiation coefficient, and S is heat exchange area, and v is production line transfer rate in stove, and t is belt steel thickness, and C is thermal capacitance, and ρ is band steel density, and TBE, TBI are respectively heating zone heat conducting band steel exports temperature and band steel temperature in.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106435160A (en) * | 2016-11-22 | 2017-02-22 | 首钢京唐钢铁联合有限责任公司 | Method and system for controlling the temperature in annealing furnace |
| CN108034804A (en) * | 2017-12-08 | 2018-05-15 | 中国地质大学（武汉） | A kind of method and system of continuous annealing unit stove area energy consumption modeling |
| CN108330257A (en) * | 2018-02-26 | 2018-07-27 | 首钢京唐钢铁联合有限责任公司 | Annealing furnace bringing-up section temprature control method and device |
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| CN110408771B (en) * | 2019-07-18 | 2021-08-20 | 首钢京唐钢铁联合有限责任公司 | Annealing furnace process transition control method and device with temperature |
| CN110408771A (en) * | 2019-07-18 | 2019-11-05 | 首钢京唐钢铁联合有限责任公司 | A kind of annealing furnace band temperature process transition control method and device |
| CN110362129A (en) * | 2019-07-19 | 2019-10-22 | 于政军 | A kind of heating cycle generation method based on steel billet key temperatures |
| CN110904327A (en) * | 2019-11-29 | 2020-03-24 | 北京首钢冷轧薄板有限公司 | Galvanizing unit, zinc ash defect control method, device and system thereof and storage medium |
| CN110904327B (en) * | 2019-11-29 | 2021-07-23 | 北京首钢冷轧薄板有限公司 | Galvanizing unit, zinc ash defect control method, device and system thereof and storage medium |
| CN111286598A (en) * | 2020-03-20 | 2020-06-16 | 首钢京唐钢铁联合有限责任公司 | Method, device and system for controlling temperature of preheating section of annealing furnace |
| CN112430727A (en) * | 2020-10-15 | 2021-03-02 | 宝钢日铁汽车板有限公司 | Method and system for early warning furnace temperature of continuous annealing furnace |
| CN112512146A (en) * | 2020-12-04 | 2021-03-16 | 深圳市拉普拉斯能源技术有限公司 | Asymmetric wire winding structure and thermal field temperature control method |
| CN112512146B (en) * | 2020-12-04 | 2023-02-10 | 深圳市拉普拉斯能源技术有限公司 | Thermal field temperature control method |
| CN115232955A (en) * | 2022-07-22 | 2022-10-25 | 安徽工业大学 | Optimized control method for strip steel temperature in dynamic heating process of continuous annealing furnace |
| CN115232955B (en) * | 2022-07-22 | 2023-07-18 | 安徽工业大学 | Optimization control method for strip steel temperature in dynamic heating process of continuous annealing furnace |
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