CN103286143B - Hot rolling slab Edge Heating Temperature Measure Control method - Google Patents
Hot rolling slab Edge Heating Temperature Measure Control method Download PDFInfo
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- CN103286143B CN103286143B CN201210044530.7A CN201210044530A CN103286143B CN 103286143 B CN103286143 B CN 103286143B CN 201210044530 A CN201210044530 A CN 201210044530A CN 103286143 B CN103286143 B CN 103286143B
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Abstract
The present invention relates to hot rolling slab Edge Heating field, particularly relate to a kind of slab Edge Heating Temperature Measure Control System and method.A kind of hot rolling slab Edge Heating Temperature Measure Control System, including sets of temperature sensors, Edge Heating inductive head, heater power source, data acquisition unit, PLC and industrial control computer.A kind of hot rolling slab Edge Heating Temperature Measure Control method, calculates according to supplied materials intermediate blank parameter and arranges heating frequency and initialization power, sets inductive head outlet intermediate blank target control temperature difference T；The comparison object temperature difference and actual measurement outlet temperature are poor, it may be judged whether need to carry out power back-off；Obtain power compensating value in conjunction with inductive head entrance temperature difference data, adjust the output of heater power source, complete to control.The present invention, according to the edge of intermediate blank and internal temperature approach before and after heating, controls output in real time, eliminates the measurement error brought due to strip edge heater gateway environment so that control accuracy greatly improves, and improves product quality.
Description
Technical field
The present invention relates to hot rolling slab Edge Heating field, particularly relate to a kind of hot rolling slab Edge Heating temperature survey control
Method processed.
Background technology
During hot strip rolling, the temperature of intermediate blank is gradually lowered, near intermediate blank edge, owing to its surface is subject to
Radiation cooling is greater than middle part, thus edge cools down faster in body.In general, away from this district of limit 50mm to edges of plate
The obvious temperature drop that territory is about 50 ~ 100 DEG C.In finishing stands, the reduction of edge temperature can bring the problem of respective various kinds, main
Have: 1) reduce mild steel and the mechanical performance of micro alloyed steel；2) increase stainless roll-force, cause rolled-in scale, table
Planar defect and limit are split；3) cause thick control difficulty and increase the abrasion of working roll.
For the problems referred to above overcoming edge temperature drop to bring, it is ensured that obtain width and thickness direction before entering mm finishing mill unit
The made-up belt of homogeneous temperature, typically arranged strip edge heater, to local in the range of made-up belt edge about 50 ~ 100mm before finishing mill
Heating, makes this region heat up 30 ~ 80 DEG C.
The computer heating control of currently advanced edge sensing heater is typically based on the physics ginsengs such as the different specific heat of steel grade, proportions
Number combines the theoretical velocity of roller-way and target temperature rise to be improved, and is calculated the heater-driven needing to control by mathematical model
The parameter of power supply, performs at the PLC that setting data is sent to control heater.Because intermediate blank after Edge Heating can not be measured
True temperature rise, so cannot be carried out the feedback control of Edge Heating, the effect that comes into operation also is difficult to obtain in time, evaluate accurately.
Summary of the invention
The technical problem to be solved is to provide a kind of hot rolling slab Edge Heating Temperature Measure Control method, right
During the output power of heater power source, in Main Basis intermediate blank, the relative temperature in same cross section is poor, so can ensure that biography
The concordance of sensor environment, eliminates the measurement system error brought due to strip edge heater gateway environment so that control essence
Degree greatly improves, and reaches to improve the purpose of product quality.
The present invention is achieved in that a kind of hot rolling slab Edge Heating Temperature Measure Control System, including temperature sensing
Device group, Edge Heating inductive head, heater power source, data acquisition unit, PLC and industrial control computer, described temperature sensor
Group has two, and two sets of temperature sensors are separately positioned on porch and the exit of strip edge heater；Each temperature sensing
Being respectively provided with at least three temperature sensors in device group, three temperature sensors are positioned on the same cross section of intermediate blank, wherein
One temperature sensor is arranged on the center of intermediate blank, and another two temperature sensor is symmetricly set on the both sides edge of intermediate blank；
The outfan of described sets of temperature sensors is connected with PLC by data acquisition unit, and described PLC controls to connect by heater power source
Edge Heating inductive head, described industrial control computer is connected with PLC.
A pair temperature sensor distance intermediate blank limit of both sides edge in described inductive head entry and exit sets of temperature sensors
Edge is from for 20 ~ 50mm.
Two described sets of temperature sensors are 1500 ~ 5000mm with the distance of the sensing heating head of strip edge heater.
A kind of hot rolling slab Edge Heating Temperature Measure Control method, comprises the following steps:
Step one, calculating heater power source power, initialization power and target setting control temperature difference T, computer control
System processed obtains every machined parameters of the intermediate blank entering Edge Heating inductive head, including material, temperature, plate width, thickness of slab, speed
Degree, is calculated initialization power and the operating frequency of heater power source, controls Edge Heating by PLC by machined parameters
Device power supply is powered to Edge Heating inductive head, and Edge Heating inductive head produces high frequency magnetic field, enters the edge of the intermediate blank passed through
Row heating；
Step 2, measure collection in real time by being arranged on two sets of temperature sensors at Edge Heating inductive head gateway
The gateway temperature data of intermediate blank, is calculated outlet according to the temperature data that the sets of temperature sensors in exit collects
Temperature difference Δ Texit, Δ TexitFor being positioned in the sets of temperature sensors in Edge Heating inductive head exit the intermediate blank center that is arranged on
Temperature sensor and the temperature difference being arranged on measured by the temperature sensor of intermediate blank edge；
Step 3, comparison object temperature difference T and outlet temperature difference Δ Texit, and make lower column selection,
1) as Δ TexitDuring≤Δ T, the output of heater power source is constant,
2) as Δ TexitDuring ＞ Δ T, it is calculated according to the temperature data that the sets of temperature sensors of porch collects
Inlet temperature difference Δ Tent, Δ TentIt is arranged in intermediate blank for being positioned in the sets of temperature sensors of Edge Heating inductive head porch
The temperature sensor of the heart and the temperature difference measured by temperature sensor being arranged on intermediate blank edge, by inlet temperature difference Δ
TentΔ T poor with outlet temperatureexit, it being calculated power compensating value Δ P with formula (1), PLC adjusts according to power compensating value Δ P
The output of heater power source；
ΔP=ken×ΔTent-kex×ΔTexit (1)
In formula: Δ P is power compensating value,
kenFor entrance penalty coefficient, kexFor export restitution coefficient, two penalty coefficients are empirical parameter, test obtain；
Repeat step 2, three composition temperature control closed loop system, until the afterbody of intermediate blank leaves Edge Heating sensing
Head), the Edge Heating temperature completing one piece of intermediate blank controls.
Hot rolling slab Edge Heating Temperature Measure Control method for heating and controlling of the present invention is according to the limit of intermediate blank before and after heating
Portion and internal temperature approach, control the output of heater power source in real time by PLC, improves the effect of Edge Heating, to heating
The relative temperature difference in same cross section rather than compare entrance limit in Main Basis intermediate blank during the output power of device power supply
The absolute temperature difference in portion carries out computer heating control；So can ensure that the concordance of sensor environment, eliminate due to Edge Heating
The measurement system error that device gateway environment brings, for the temperature sensor of same accuracy, uses the present invention to carry out temperature control
System makes control accuracy greatly improve, and reaches to improve the purpose of product quality.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of hot rolling slab Edge Heating Temperature Measure Control System of the present invention；
Fig. 2 is the control flow chart of hot rolling slab Edge Heating Temperature Measure Control method of the present invention.
In figure: 1 intermediate blank, 2 sets of temperature sensors, 3 Edge Heating inductive heads, 4 heater power sources, 5 data acquisition units,
6PLC, 7 industrial control computers.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further.Should be understood that these embodiments are merely to illustrate the present invention
Rather than restriction the scope of the present invention.In addition, it is to be understood that after having read the content of present invention statement, people in the art
The present invention can be made various changes or modifications by member, and these equivalent form of values fall within the application appended claims equally and limited
Scope.
Embodiment 1
As it is shown in figure 1, a kind of hot rolling slab Edge Heating Temperature Measure Control System, including sets of temperature sensors 2, edge
Heat induced 3, heater power source 4, data acquisition unit 5, PLC6 and industrial control computer 7, described sets of temperature sensors 2 is altogether
Having two groups, two sets of temperature sensors 2 are separately positioned on porch and the exit of Edge Heating inductive head 3；Each temperature passes
Being respectively provided with at least three temperature sensors in sensor group 2, three temperature sensors are positioned on the same cross section of intermediate blank 1,
One of them temperature sensor is arranged on the center of intermediate blank 1, and another two temperature sensor is symmetricly set on the both sides of intermediate blank 1
Edge；The outfan of described sets of temperature sensors 2 is connected with PLC6 by data acquisition unit 5, and described PLC 6 is by adding
Hot device power supply 4 controls to connect Edge Heating inductive head 3, and described industrial control computer 7 is connected with PLC6.
In the present embodiment, in order to ensure that sets of temperature sensors 2 can record middle part and the edge temperature of intermediate blank 1 accurately
Difference, is arranged on a pair temperature sensor distance intermediate blank of the both sides edge of intermediate blank 1 in described each sets of temperature sensors 2
The edge of 1 is 20 ~ 50mm, and in the present embodiment, this distance selects 25mm.
In the present embodiment, in order to prevent the heating efficiency of Edge Heating inductive head 3 from having influence on the survey of sets of temperature sensors 2
From heater too far, the change of intermediate blank 1 occurrence temperature makes measurement result inaccurate, described for accuracy of measurement or sets of temperature sensors 2
The distance of two sets of temperature sensors 2 and Edge Heating inductive head 3 be 1500 ~ 5000mm, in the present embodiment, two temperature
Sensor group 2 is symmetricly set on the position of distance Edge Heating inductive head 3 gateway two ends 2000mm.
As in figure 2 it is shown, a kind of hot rolling slab Edge Heating Temperature Measure Control method, comprise the following steps:
Step one, calculating heater power source power, initialization power and target setting control temperature difference T, computer control
System 7 processed obtains every machined parameters of the intermediate blank 1 entering Edge Heating inductive head 3, including material, temperature, plate width, plate
Thick, speed, is calculated initialization power and the operating frequency of heater power source 4, by PLC6 control by machined parameters
Strip edge heater power supply 4 powers to Edge Heating inductive head 3, and Edge Heating inductive head 3 produces high frequency magnetic field, to the centre passed through
The edge of base 1 heats；
Step 2, measure in real time and adopt by being arranged on two sets of temperature sensors 2 at Edge Heating inductive head 3 gateway
The gateway temperature data of collection intermediate blank 1, is calculated according to the temperature data that the sets of temperature sensors 2 in exit collects
Outlet temperature difference Δ Texit, Δ TexitIt is arranged on intermediate blank for being positioned in the sets of temperature sensors in Edge Heating inductive head exit
The temperature sensor at center and the temperature difference measured by temperature sensor being arranged on intermediate blank edge；Due to two temperature sensing
Having certain distance between device group 2, there is time difference by gateway sensor group 2 in the same cross section of intermediate blank 1, therefore two temperature
The intermediate blank 1 same section temperature data asynchronous that sensor group 2 gathers.In other words, Edge Heating inductive head 3 gateway temperature
The temperature data of degree sensor group 2 synchro measure collection is not the temperature before and after the heating of intermediate blank 1 same cross section, it is impossible to completely
Variations in temperature before and after reaction intermediate blank 1 Edge Heating.Length (typically having tens meters long) and mobile speed in view of intermediate blank 1
Degree (70m/min), it is believed that in the case of not having Edge Heating, intermediate blank 1 longitudinally (intermediate blank traffic direction) temperature is divided
Cloth is almost uniformity.Analyze and practical condition based on above, temperature measurement time can be ignored poor.
Step 3, comparison object temperature difference T and outlet temperature difference Δ Texit, and make lower column selection,
1) as Δ TexitDuring≤Δ T, the output of heater power source 4 is constant,
2) as Δ TexitDuring ＞ Δ T, it is calculated according to the temperature data that the sets of temperature sensors 2 of porch collects
Inlet temperature difference Δ Tent, Δ TentIt is arranged on intermediate blank for being positioned in the sets of temperature sensors 2 of Edge Heating inductive head 3 porch
The temperature sensor at 1 center and the temperature difference measured by temperature sensor being arranged on intermediate blank 1 edge, poor by inlet temperature
ΔTentΔ T poor with outlet temperatureexit, it being calculated power compensating value Δ P with formula (1), PLC6 is according to power compensating value Δ P
Adjust the output of heater power source 4；
ΔP=ken×ΔTent-kex×ΔTexit (1)
In formula: Δ P is power compensating value,
kenFor entrance penalty coefficient, kexFor export restitution coefficient, two penalty coefficients are empirical parameter, test obtain；
Repeat step 2, three composition temperature control closed loop system, and control system 7 is according to the sets of temperature sensors 2 in exit
Signal judge that the afterbody of intermediate blank 1 has already been through inductive head 3, heating of plate blank completes, and the edge completing one piece of intermediate blank 3 adds
Hot temperature controls.
Embodiment 2
The specific embodiment of an intermediate blank Edge Heating is described below, and all calculating control data and are monolateral heating,
Another side is symmetrical or individually controls
The intermediate blank 1 of ordinary carbon steel material that one piece of thickness is 40mm, a length of 60m, the speed of service are 1.5m/s, edge
The section temperature that heat induced 3 inlet temperature sensor group 2 records is: intermediate blank 1 central temperature is 1050 DEG C, distance limit
Temperature at edge 25mm is 950 DEG C.In order to ensure the concordance of intermediate blank 1 transverse temperature, need it is carried out Edge Heating, make
Temperature at intermediate blank 1 edge distance 25mm raises 100 DEG C, it is desirable to the transverse temperature difference Δ T of the intermediate blank 1 after heating controls
Within 10 DEG C, concrete heating calculates data and the process of control is as follows.
The first step, according to the thickness of intermediate blank 1, material, the speed of service, the entrance temperature difference, temperature rise value, determines heater power source
The frequency of 4 is 320Hz, monolateral power 1500kW.PLC6 is energized to inductive head 3 according to set value calculation heater power source 4, starts
The intermediate blank 1 of process is heated.
Second step, measures Edge Heating inductive head 3 entrance and exit temperature and calculates the entrance temperature difference and the outlet temperature difference.Entrance
Sets of temperature sensors 2 records the section temperature value of the most heated intermediate blank 1: 1050 DEG C of center, edge 950 DEG C, calculates
To entrance temperature difference Tent=1050-1030=20℃；Outlet temperature sensor group 2 records the cross section of the intermediate blank 1 after heating
Temperature value is: 1050 DEG C of center, edge 1030 DEG C, is calculated outlet temperature difference Texit=1050-1030=20℃；
3rd step, compares Δ TexitSize with Δ T.Because Δ Texit=20 DEG C of ＞ 10 DEG C=Δ T, so needing heating
The power setting of device power supply 4 compensates, and offset is △ P, the basis formula (1) of △ P.
In the present embodiment, the coefficient value of formula (1) is ken=kex=3kW/℃；
According to formula (1), obtain △ P=ken×ΔTent-kex×ΔTexit=3×100-3×20=240kW.PLC6 according to
It is 1740kW that power compensating value Δ P adjusts the output of heater power source 4, changes the output power of Edge Heating inductive head 3.
Repeating second step, survey calculation obtains entrance temperature difference TentConstant；The centre that outlet temperature sensor group 2 records
The section temperature value of base 1 is: 1050 DEG C of center, edge 1045 DEG C, exports temperature difference Texit=5 DEG C of ＜ 10 DEG C=Δ T, keeps sensing
Heating power supply 4 power is constant.
4th step, control system 7 has judged the afterbody of intermediate blank 1 according to the signal of the sets of temperature sensors 2 in exit
Pass through heat induced 3, have two selections herein:
(1) measured value of three temperature sensors in outlet temperature sensor group 2 does not has big fluctuation, returns to second
Step；
All temperature sensor measurement values in outlet temperature sensor group 2 are below 600 DEG C, and the tail of intermediate blank 1 is described
Portion has already been through inductive head, and heating of plate blank completes, and the Edge Heating temperature completing one piece of intermediate blank controls.
Claims (1)
1. a hot rolling slab Edge Heating Temperature Measure Control method, is characterized in that, comprises the following steps:
Step one, calculating heater power source power, initialization power and target setting control temperature difference T, and computer controls system
System (7) obtains every machined parameters of the intermediate blank (1) entering Edge Heating inductive head (3), including material, temperature, plate width, plate
Thick, speed, is calculated initialization power and the operating frequency of heater power source (4), by PLC (6) by machined parameters
Controlling strip edge heater power supply (4) to power to Edge Heating inductive head (3), Edge Heating inductive head (3) produces high frequency magnetic field, right
The edge of the intermediate blank (1) passed through heats；
Step 2, measure in real time and adopt by being arranged on two sets of temperature sensors (2) at Edge Heating inductive head (3) gateway
The gateway temperature data of collection intermediate blank (1), calculates according to the temperature data that the sets of temperature sensors (2) in exit collects
Obtain outlet temperature difference Δ Texit, Δ TexitSet for being positioned in the sets of temperature sensors (2) in Edge Heating inductive head (3) exit
The temperature difference putting temperature sensor at intermediate blank (1) center and be arranged on measured by the temperature sensor of intermediate blank (1) edge；
Step 3, comparison object temperature difference T and outlet temperature difference Δ Texit, and make lower column selection,
1) as Δ TexitDuring≤Δ T, the output of heater power source (4) is constant,
2) as Δ TexitDuring ＞ Δ T, the temperature data collected according to the sets of temperature sensors (2) of porch be calculated into
Mouth temperature difference Δ Tent, Δ TentIt is arranged on centre for being positioned in the sets of temperature sensors (2) of Edge Heating inductive head (3) porch
The temperature sensor at base (1) center and the temperature difference measured by temperature sensor being arranged on intermediate blank (1) edge, pass through entrance
Temperature difference Δ TentΔ T poor with outlet temperatureexit, it is calculated power compensating value Δ P, PLC (6) with formula (1) and mends according to power
Repay value Δ P and adjust the output of heater power source (4)；
ΔP=ken×ΔTent-kex×ΔTexit (1)
In formula: Δ P is power compensating value,
kenFor entrance penalty coefficient, kexFor export restitution coefficient, two penalty coefficients are empirical parameter, test obtain；
Repeat step 2, three composition temperature control closed loop system, until the afterbody of intermediate blank (1) leaves Edge Heating inductive head
(3) the Edge Heating temperature, completing one piece of intermediate blank controls.
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