CN102392119B - Online comprehensive control method for hot-galvanized continuous annealing furnace - Google Patents
Online comprehensive control method for hot-galvanized continuous annealing furnace Download PDFInfo
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- CN102392119B CN102392119B CN 201110333416 CN201110333416A CN102392119B CN 102392119 B CN102392119 B CN 102392119B CN 201110333416 CN201110333416 CN 201110333416 CN 201110333416 A CN201110333416 A CN 201110333416A CN 102392119 B CN102392119 B CN 102392119B
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Abstract
The present invention discloses an online comprehensive control method for a hot-galvanized continuous annealing furnace. The method collects the operating information, including band steel speed, processing technique, steel coil codes and band steel specifications, of band steel through an online detection module. According to the collected operating information of band steel, the method calls main parameters through an expert database, so as to complete thermal load setting and speed setting by the co-operation of a speed model, a heat transfer model and a band temperature feedback model. Therefore, according to the set parameters, the method automatically controls a primary control system, so as to achieve the online production control of an annealing furnace. Based on heat transfer mechanism analysis, the method achieves the online production control of an annealing furnace by building a one-dimensional math model and the expert database with two cross-control methods: coarse tuning and fining tuning. In addition, the method also provides an additional series of complete control strategies such as a transition control method, so as to form a relative perfect control method. The models can be built conveniently and operate fast. Therefore, the method is suitable for the online production computation and control of an annealing furnace.
Description
Technical field
The invention belongs to automation field, relate to the automatic on-line control of pot galvanize continuous annealing furnace, relating in particular to a kind of is research object with heat-transfer mechanism in the annealing furnace, adopts belt steel temperature to follow the tracks of mathematical model, adopts coarse adjustment, fine setting to regulate the on-line automatic control method that combines automatically for two kinds.
Background technology
At present, domestic to have zinc-plated annealing furnace more, but China's annealing furnace control level with abroad compare, have a certain distance, the control level of total system and single devices all remains to be improved further.Company of Nippon Steel monarch Tianjin steel mill of Japan maximum continuous annealing service line in the world that has been constructed and put into operation in August, 1991.In the annealing furnace section of this service line, its heating zone adopts the radiator tube heating, and remains the constant flow of controlling coal gas as target with the actual belt steel temperature that the heating zone outlet side records.
Domestic control method with regard to annealing furnace has proposed some patent applications at present, but major part is controlled to illustrate at one-level, patent such as CN201020204449.7, CN201020528237.4 for example, they mainly are realization equipment and furnace temperature, are with directly feedback control of temperature, lack mathematical model and theoretical basis.And the patent No. be the annealing furnace heating system of CN201020256197.2 mainly is at a kind of method of heating subregion control, lacks whole control method.
Summary of the invention
In view of this, the online integrated control method that the purpose of this invention is to provide a kind of pot galvanize continuous annealing furnace, this method is based on the heat-transfer mechanism analysis, set up One dimensional Mathematical Model and expert database, by coarse adjustment, two kinds of intersections of fine setting control method, realize the online production control of annealing furnace, its model is set up rapidly, operation is fast, is applicable to that online production is calculated and control.
The objective of the invention is to be achieved through the following technical solutions:
Said method comprising the steps of:
Step 1: by online detection module collection band steel operation information, comprise strip speed, treatment process, coil of strip code and band steel specification; According to the band steel operation information of gathering, by expert data library call significant parameter, described expert database is according to the thermal treatment process temperature curve, set each section thermal load set(ting)value, make the band steel all reach the desired target value of thermal treatment process temperature curve in each stroke exit, finish speed initial setting and thermal load initial setting by rate pattern and heat transfer model, thereby control first class control system automatically according to the parameter of setting, begin the online production of annealing furnace is controlled;
Step 2: the calculating of every section each row thermal load is that given each section respectively is listed as initial thermal load, utilize the belt steel temperature trace model to heat calculating then, obtain the belt steel temperature in each stroke exit, the belt steel temperature that calculates and the target temperature of being with each stroke outlet band steel in the steel heat treatment process temperature curve are compared, according to correction thermal load as a result, until the belt steel temperature that calculates and the error between the target value within the range of permission, calculate and finish;
Wherein, it is length one dimension trace model that belt steel temperature is followed the tracks of mathematical model, is used for following the tracks of the temperature variations of node in stove, obtains in the following manner:
Annealing furnace is launched along band steel travel direction, because the band steel is very thin, ignore the temperature difference on the thickness, the strip width direction gradient is less simultaneously, is assumed to zero, according to thermal conduction study, sets up the one-dimensional and unsteady state heat conduction equation:
In the formula: x-furnace superintendent direction coordinate, m;
T-time, s;
T
f-belt steel temperature, K;
λ-band steel thermal conductivity, W/ (mK);
Q-length is the heat that the band steel of Δ x obtains, W;
ρ-band steel density, kg/m
3
C-band steel specific heat, J/ (kg K);
V-band steel volume, m
3
ν=hw Δ x, h-belt steel thickness, m; W-strip width, m;
When setting up model, in stove, the band steel is divided into some nodes along furnace superintendent, each node adopts the one dimension trace model, will form full furnace temperature model in conjunction with the temperature of all nodes, namely follows the trail of model with one and can realize following the tracks of and the distribute calculating of two modes of full stove with temperature;
Wherein the value of time step is decided by the ratio of space step-length and speed, that is:
△t=△x/V(t)
In the formula: V (t)-strip speed, m/s;
Step 3: described band temperature feedback model is according to the result of thermal load corrected Calculation, each section of combined belt steel temperature out is carried out feedback optimized control, according to thermal lag and temperature deviation, by different adjusting ratios each section control parameter is optimized control, comprise the real-time setting of thermal load and the real-time setting of speed, automatically control first class control system according to the parameter of setting, make the control of each section of band steel thermal treatment temp fast and stable near target temperature.
Further, described significant parameter comprises heat treatment cycle curve, thermal load set(ting)value and top speed recommended value;
Further, present method also establishes band steel transition control model, described band steel transition control model is to judge control mode by the band steel information that detects the weld seam front and back, control belt speed and heating cycle respectively, come the smooth transition of optimal control weld seam front and back band steel heat treatment cycle curve, reduce owing to not reaching the scratch tape that heat treatment requirements produces;
Further, the control mode of described band steel transition control model is:
The last band steel of weld seam adopts the thermal load under this specification to preset, when weld seam enters annealing furnace, each section of amendment tape temperature export goal value, the purpose that reaches cooling or heat up, this moment is by regulating the output valve of thermal load set(ting)value with warm target value and the ratio that feeds back to, in this stage, strip speed generation stepped change, the temperature if the temperature out under this specification oversteps the extreme limit, then belt speed does not change, in temperature out reaches capacity scope; When weld seam went out annealing furnace, model then called database thermal load set(ting)value and target temperature out according to a specification behind the weld seam, and control gradually returns to normal production;
Further, present method comprises also being rapidly heated and the two kinds of patterns of lowering the temperature that when outlet was with warm target value and detected value to differ above set scope, model can be regulated radiator tube automatically, directly adjusts to the pattern of standard-sized sheet or complete shut-down in control process; When the scene occurs unexpectedly, need to strengthen or when reducing the radiator tube temperature, can the quick adjustment target value, control heating cycle fast;
Further, described control method also is provided with system's broken belt forecast function, when system detects the band steel information of weld seam front and back, mathematical model can be poor according to belt steel thickness, stand out and thermal treatment grade are judged, when surpassing welding scope, system can send broken belt forecast warning, and band steel information comprises strip speed, treatment process, coil of strip code, band steel specification, and weld seam is to the distance of annealing furnace point.
The invention has the beneficial effects as follows:
The present invention is based on the heat-transfer mechanism analysis, by setting up One dimensional Mathematical Model and expert database, by coarse adjustment, two kinds of intersections of fine setting control method, realize the online production control of annealing furnace, also increased a series of complete control strategies such as transition control method simultaneously in addition, thereby formed comparatively perfect control method, its model construction is convenient, operation is fast, is applicable to that the online production of annealing furnace is calculated and control.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can obtain instruction from the practice of the present invention.Target of the present invention and other advantages can realize and obtain by following specification sheets and claims.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is band steel Continuous Hot Dip Galvanizing Annealing Furnace control strategy synoptic diagram;
Fig. 2 is thermal load set(ting)value calculation flow chart;
Fig. 3 is the variation strategy (only with speed drop to example, do not limit belt speed version) of strip speed in the tape swapping process along with the time;
Fig. 4 sets the variation strategy (only with temperature rising be example, do not limit furnace temperature version) of band temperature along with the time for RTF outlet in the tape swapping process.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
Vertical pot galvanize continuous annealing furnace is made up of preheating section, heating zone, soaking zone, fast cold section, equalizer section.Preheating section all is by recirculation blower the band steel to be carried out heating and cooling to handle with fast cold section, heating zone and soaking zone then are that the power by radiator tube adds thermal control, equalizer section is to be with warm control of export by naturally cooling and partial radiation pipe, and retainer belt steel exports temperature satisfies zinc-plated temperature requirement.
As shown in Figure 1, method of the present invention may further comprise the steps:
Step 1: by online detection module collection band steel operation information, comprise strip speed, treatment process, coil of strip code and band steel specification; According to the band steel operation information of gathering, by expert data library call significant parameter, described expert database is according to the thermal treatment process temperature curve, set each section thermal load set(ting)value, make the band steel all reach the desired target value of thermal treatment process temperature curve in each stroke exit, finish speed initial setting and thermal load initial setting by rate pattern and heat transfer model, thereby control first class control system automatically according to the parameter of setting, begin the online production of annealing furnace is controlled; Among the present invention, described significant parameter comprises heat treatment cycle curve, thermal load set(ting)value and top speed recommended value.
Step 2: respectively be listed as at given each section on the basis of initial thermal load, calculate every section each row thermal load, utilize the belt steel temperature trace model to heat calculating then, obtain the belt steel temperature in each stroke exit, the belt steel temperature that calculates and the target temperature of being with each stroke outlet band steel in the steel heat treatment process temperature curve are compared, according to correction thermal load as a result, until the belt steel temperature that calculates and the error between the target value within the range of permission, calculate and finish;
It is length one dimension trace model that belt steel temperature is followed the tracks of mathematical model, is used for following the tracks of the temperature variations of node in stove, obtains in the following manner:
Annealing furnace is launched along band steel travel direction, because the band steel is very thin, ignore the temperature difference on the thickness, the strip width direction gradient is less simultaneously, is assumed to zero, according to thermal conduction study, sets up the one-dimensional and unsteady state heat conduction equation:
In the formula: x-furnace superintendent direction coordinate, m;
T-time, s;
T
f-belt steel temperature, K;
λ-band steel thermal conductivity, W/ (mK);
Q-length is the heat that the band steel of Δ x obtains, W;
ρ-band steel density, kg/m
3
C-band steel specific heat, J/ (kg K);
V-band steel volume, m
3
ν=hw Δ x, h-belt steel thickness, m; W-strip width, m.
When setting up model, in stove, the band steel is divided into some nodes along furnace superintendent, each node adopts the one dimension trace model, will form full furnace temperature model in conjunction with the temperature of all nodes, namely follows the trail of model with one and can realize following the tracks of and the distribute calculating of two modes of full stove with temperature; Both guarantee the convergency that DIFFERENCE EQUATIONS is calculated, and can shorten model computing time again.
Wherein the value of time step is decided by the ratio of space step-length and speed, that is:
△t=△x/V(t)
In the formula: V (t)-strip speed, m/s.
The discrete one dimension fully implicit solution finite difference method that adopts of governing equation carries out discretize, obtains following discretization equation:
(1) internal node (i point) discrete form:
i=1～N-1
(2) boundary node (0 and N point) discrete form:
Make up expert database according to mathematical model, according to the thermal treatment process temperature curve, set each section thermal load set(ting)value, make the band steel all reach the desired target value of thermal treatment process temperature curve in each stroke exit;
Step 3: with the result of warm feedback model according to the thermal load corrected Calculation, each section of combined belt steel temperature out is carried out feedback optimized control, according to thermal lag and temperature deviation, by different adjusting ratios each section control parameter is optimized control, comprise the real-time setting of thermal load and the real-time setting of speed, automatically control first class control system according to the parameter of setting, make the control of each section of band steel thermal treatment temp fast and stable near target temperature.
Fig. 2 is the principle flow chart that calculates the thermal load set(ting)value.As can be seen from the figure, at first given each section respectively is listed as initial thermal load, utilizes the belt steel temperature trace model to heat calculating then, obtains the belt steel temperature in each stroke exit.The target temperature of each stroke outlet band steel in the belt steel temperature that calculates and the band steel heat treatment process temperature curve is compared, according to correction thermal load as a result, until the belt steel temperature that calculates and the error between the target value within the range of permission, calculate and finish.(the adjacent iterative computation difference of △ T representation temperature among the figure, ε represents the setting accuracy of iteration difference)
Present method also establishes band steel transition control model, and described band steel transition control model is to judge control mode by the band steel information that detects the weld seam front and back, controls belt speed and heating cycle respectively.Transition herein refers to that last specification band steel changes the interior transition situation of a time period between the one specification band steel of back into.And the control strategy of band steel transient process is an important component part in the annealing furnace control process, band steel specifications vary is frequent in the annealing furnace, the thermal treatment temperature difference is bigger, suitable transition control model need be arranged, the quick adjustment heating mode, make the effective transition of thermal treatment temp, reduce the generation of scratch tape.
The limit temperature difference that the transition control strategy to need in control process to require to guarantee two kinds of band steel of arbitrary distance of run all should satisfy the temperature bound shown in the table 1, if go beyond the limit of requirement, then preferentially satisfies the higher thermal treatment process temperature of band steel quality requirements.
The control requirement of each each section of grade temperature bound of table 1
| The technology grade | The secondary Accounting Legend Code | The heating zone upper limit ℃ | Heating zone lower |
| CQ | |||
| 1 | +U1 | -D1 | |
| DQ | 2 | +U2 | -D2 |
| DDQ | 3 | +U3 | -D3 |
| EDDQ | 4 | +U4 | -D4 |
The tape swapping strategy is at first to control according to the thermal load set(ting)value ordinary production under the last band steel of the weld seam specification, when weld seam enters annealing furnace, revise current each section of band temperature export goal value, the purpose that reaches cooling or heat up, then by regulating the output valve of thermal load set(ting)value with warm target value and the ratio that feeds back to, shown in Fig. 4 and table 3.In this stage, strip speed generation stepped change as shown in Figure 3, makes the belt steel temperature fluctuation, therefore increase the restricted condition of heating zone outlet belt steel temperature, satisfy when actual band temperature under the situation of limit range requirement, can carry out the speed blocked operation, otherwise, keep present speed, see Table 2.When weld seam went out annealing furnace, model then called database thermal load set(ting)value and target temperature out according to a specification behind the weld seam, and control gradually returns to normal production.
The condition that each grade permissible velocity of table 2 is switched
| The technology grade | The secondary Accounting Legend Code | Heating zone | Allow operation | Heating zone | Allow |
| CQ | |||||
| 1 | Lower value | Speed descends | ＜higher limit | Speed rises | |
| DQ | 2 | Lower value | Speed descends | ＜higher limit | Speed rises |
| DDQ | 3 | Lower value | Speed descends | ＜higher limit | Speed rises |
| EDDQ | 4 | Lower value | Speed descends | ＜higher limit | Speed rises |
The control requirement of transition temperature T3 during each grade tape swapping of table 3
Present method comprises also being rapidly heated and the two kinds of patterns of lowering the temperature that when outlet was with warm target value and detected value to differ above set scope, model can be regulated radiator tube automatically, directly adjusts to the pattern of standard-sized sheet or complete shut-down in control process; When the scene occurs unexpectedly, need to strengthen or when reducing the radiator tube temperature, can the quick adjustment target value, control heating cycle fast.
Control method also is provided with automatic control mode and manual master mode; Described automatic control mode does not need manual intervention, directly according to information setting target outlet band temperature and the radiator tube power division of coil of strip, is applicable to ordinary production; Described manual mode is when the information input error or midway during the unit fault, carries out manual intervention, and working method such as heating mode or other patterns are set.
Control method also is provided with system's broken belt forecast function, this function is the band steel information that detects the weld seam front and back by system, starting predefined comparison program compares, judge according to front and back band steel thickness difference, stand out and thermal treatment grade, when surpassing welding scope, system sends broken belt forecast warning.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (5)
1. the online integrated control method of pot galvanize continuous annealing furnace is characterized in that: said method comprising the steps of:
Step 1: by online detection module collection band steel operation information, comprise strip speed, treatment process, coil of strip code and band steel specification; According to the band steel operation information of gathering, by expert data library call significant parameter, described expert database is according to the thermal treatment process temperature curve, set each section thermal load set(ting)value, make the band steel all reach the desired target value of thermal treatment process temperature curve in each stroke exit, finish speed initial setting and thermal load initial setting by rate pattern and heat transfer model, thereby control first class control system automatically according to the parameter of setting, begin the online production of annealing furnace is controlled;
Step 2: respectively be listed as at given each section on the basis of initial thermal load, calculate every section each row thermal load, utilize the belt steel temperature trace model to heat calculating then, obtain the belt steel temperature in each stroke exit, the belt steel temperature that calculates and the target temperature of being with each stroke outlet band steel in the steel heat treatment process temperature curve are compared, according to correction thermal load as a result, until the belt steel temperature that calculates and the error between the target value within the range of permission, calculate and finish;
Wherein, it is length one dimension trace model that belt steel temperature is followed the tracks of mathematical model, is used for following the tracks of the temperature variations of node in stove, obtains in the following manner:
Annealing furnace is launched along band steel travel direction, because the band steel is very thin, ignore the temperature difference on the thickness, the strip width direction gradient is less simultaneously, is assumed to zero, according to thermal conduction study, sets up the one-dimensional and unsteady state heat conduction equation:
In the formula: x-furnace superintendent direction coordinate, m;
T-time, s;
T
f-belt steel temperature, K;
λ-band steel thermal conductivity, W/ (mK);
Q-length is the heat that the band steel of Δ x obtains, W;
ρ-band steel density, kg/m
3
C-band steel specific heat, J/ (kg K);
V-band steel volume, m
3
ν=hw Δ x, h-belt steel thickness, m; W-strip width, m;
When setting up model, in stove, the band steel is divided into some nodes along the furnace superintendent direction, each node adopts the one dimension trace model, will form full furnace temperature model in conjunction with the temperature of all nodes, namely follows the trail of model with one and can realize following the tracks of and the distribute calculating of two modes of full stove with temperature;
Wherein the value of time step is decided by the ratio of space step-length and speed, that is:
△t=△x/V(t)
In the formula: V (t)-strip speed, m/s;
Step 3: with the result of warm feedback model according to the thermal load corrected Calculation, each section of combined belt steel temperature out is carried out feedback optimized control, according to thermal lag and temperature deviation, by different adjusting ratios each section control parameter is optimized control, comprise the real-time setting of thermal load and the real-time setting of speed, automatically control first class control system according to the parameter of setting, make the control of each section of band steel thermal treatment temp fast and stable near target temperature.
2. the online integrated control method of pot galvanize continuous annealing furnace according to claim 1, it is characterized in that: described significant parameter comprises heat treatment cycle curve, thermal load set(ting)value, top speed recommended value.
3. the online integrated control method of pot galvanize continuous annealing furnace according to claim 1, it is characterized in that: present method also establishes band steel transition control model, described band steel transition control model is to judge control mode by the band steel information that detects the weld seam front and back, control belt speed and heating cycle respectively, come the smooth transition of optimal control weld seam front and back band steel heat treatment cycle curve, reduce owing to not reaching the scratch tape that heat treatment requirements produces;
The control mode of described band steel transition control model is:
The last band steel of weld seam adopts the thermal load under this specification to preset, when the weld seam detection device before weld seam is annealed the stove entrance detects, each section of beginning amendment tape temperature export goal value, the purpose that reaches cooling or heat up, this moment is by coming ratio to regulate the output valve of thermal load set(ting)value with warm target value and value of feedback, in this stage, strip speed generation stepped change, the temperature if the temperature out under this specification oversteps the extreme limit, then belt speed does not change, in temperature out reaches capacity scope; When weld seam went out annealing furnace, model then called database thermal load set(ting)value and target outlet according to a specification behind the weld seam, and control gradually returns to normal production.
4. the online integrated control method of pot galvanize continuous annealing furnace according to claim 1, it is characterized in that: present method is in control process, also comprise and be rapidly heated and lower the temperature two kinds of patterns, when outlet is with warm target value and detected value to differ above set scope, model can be regulated radiator tube automatically, directly adjusts to the pattern of standard-sized sheet or complete shut-down; When the scene occurs unexpectedly, need to strengthen or when reducing the radiator tube temperature, can the quick adjustment target value, control heating cycle fast.
5. the online integrated control method of pot galvanize continuous annealing furnace according to claim 1, it is characterized in that: described control method feasible system broken belt forecast function, this function is when detecting the band steel information of weld seam front and back by system, starting predefined comparison program compares, according to the front and back band steel thickness difference, stand out and thermal treatment grade are judged, when surpassing welding scope, system sends broken belt forecast warning, band steel information comprises strip speed, treatment process, the coil of strip code, band steel specification, and weld seam is to the distance of annealing furnace point.
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| CN102392119A (en) | 2012-03-28 |
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