• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    in the steel sheet temperature control equipment (1), which is an embodiment of the present invention, a state variable/disturbance evaluation unit (15) simultaneously evaluates the values for a state variable of the control model and the variable of temperature disturbance. using the values of the control model state variable and the temperature perturbation variable, a furnace temperature change magnitude calculation unit (16) calculates the furnace temperature change magnitude for each heating zone under constraint conditions so that the sum of squares of the deviation between the target value and the actual value of the steel plate temperature on the outlet side of the heating furnace is minimized. a kiln temperature control unit (17) controls the flow rate for the fuel used in each heating zone so that the calculated magnitude of kiln temperature change can be achieved.
    公开号:BR112018013742B1
    申请号:R112018013742-1
    申请日:2016-11-02
    公开日:2021-08-31
    发明作者:Tomoyoshi Ogasahara；Goki YAMADA
    申请人:Jfe Steel Corporation；
    IPC主号:
    专利说明:

    Field
    [1] The present invention relates to an equipment for controlling the temperature of a steel sheet and a method of controlling the temperature of the steel sheet. Background
    [2] In general, continuous annealing equipment for a steel plate includes a heating furnace, an isothermal heating furnace, a cooling furnace, etc. On the inlet side of the equipment, a tail portion of a preceding material and a nose portion of a subsequent material that have different sizes in plate thickness and width, standards, and annealing conditions are welded together and are continuously processed as a single steel plate. The purpose of this process is to carry out a heating process suitable for each annealing condition by changing the oven temperature set value of each heating zone in the heating oven before and after the welded part. Eventually, the steel sheet is cut and shipped in coil units or delivered to the next process on the output side of the equipment.
    [3] In a heating furnace, the temperature of a steel sheet is usually increased by radiating heat using a radiant tube. However, when the sizes of steel sheets, etc., are different before and after the welded part, the temperatures of the steel sheets vary because the heating conditions become the same before and after the welded part. Also, as the time constant required to control the radiant tube is large, the response is slow and the temperature variation period of the steel sheet is increased under normal feedback control. Consequently, for example, as described in Patent Literatures 1 and 2, the response is shortened by performing direct feed control based on information such as changing the size or standard of the steel sheet, and significantly changing the temperature of the furnace and the fuel flow rate in a short period of time.
    [4] More specifically, Patent Literature 1 describes a method for continuously adjusting the fuel flow rate by continuously measuring the emissivity of the steel sheet in advance using infrared rays, and canceling the temperature variation of the sheet. expected variation and emissivity, at a time when the steel plate passes immediately below the burner. Patent Literature 2 describes a method for controlling the fuel flow rate by precalculating the steel sheet temperature time series data and the fuel flow rate following a target value of the steel sheet temperature with an error from the target value being kept to a minimum value using a dynamic model of steel plate temperature, plate thickness, line speed, and fuel flow rate.
    [5] In direct feed control as described above, the furnace temperature and fuel flow rate are adjusted according to the model based on information obtained previously. However, as the direct feed control is not a control based on the measured value of the steel sheet temperature, a deviation from the control occurs due to model error. So the gain control needs to be adjusted according to the model error. Under these circumstances, Patent Literature 3 describes a method for specifying a steel sheet temperature response trajectory that changes towards the steel sheet temperature reference value using a certain parameter, and determining the temperature. of the furnace based on the dynamic model using variables related to the steel plate specifications such as plate thickness and plate width in order to achieve the response trajectory. List of Patent Literature Citations
    [6] Patent Literature 1: Japanese Patent No. 5510787 Patent Literature 2: Japanese Patent Application Opened to Public Inspection No. 64-28329 Patent Literature 3: Japanese Patent Application Opened to Public Inspection No. 3-236422 Summary Technical problem
    [7] The methods described in Patent Literatures 1 and 2 are considered to work effectively to improve the temperature responsiveness of steel sheet. However, with the methods described in Patent Literatures 1 and 2, when a certain measurable element of disturbance is introduced, the furnace temperature and the fuel flow rate of the heating furnace to reach the target value of the steel plate temperature are calculated using a model with an error. Consequently, a control deviation (stability deviation) appears in stability without the disturbing element. On the other hand, the method described in Patent Literature 3 implements good responsiveness control without deviation from stability, by collecting the actual steel plate temperature values on the output side of the heating furnace in a constant period , sequentially adjusting the temperature response trajectory of the steel sheet, and calculating an appropriate furnace temperature value by predicting the temperature of the steel sheet in the future taking into account differences between the preceding material and the subsequent material such as the thickness of the plate and the width of the plate in the model. However, in the method described in Patent Literature 3, when the insertion temperature of the steel sheet is varied on the inlet side of the heating furnace at a certain time, the model error is increased. Furthermore, when feedback control based only on the steel plate temperature measurement value is performed on the output side of the heating furnace, the responsiveness is reduced.
    [8] Thus, a method of controlling sheet steel temperature that simultaneously satisfies two control indices was desired to improve responsiveness using direct feed control and eliminate stability deviation using control. feedback. Although the two control indexes can be designed separately, the amount of operation of the direct feed control is the disturbance to the feedback control when a proper design or adjustment is not done. So it's a challenge to design the two control indices so that they don't interfere with each other.
    [9] The present invention was made in view of the above problem, and an object of the present invention is to provide a steel sheet temperature control equipment and a steel sheet temperature control method that can control the temperature of a sheet steel in a heating oven with good responsiveness and good follow-up capacity. Solution to problem
    [10] To solve the problem and achieve the goal, a steel sheet temperature control equipment in accordance with the present invention includes: a sheet temperature measuring unit that measures the temperature of a steel sheet in an inlet side and an outlet side of a heating furnace including a plurality of heating zones disposed along the direction of transport of the steel sheet; an oven temperature measuring unit that measures the oven temperature in each of the heating zones; an influence coefficient calculation unit that calculates an influence coefficient representing the change in temperature of the steel sheet at the output side of the heating furnace in response to the change in temperature of the steel plate at the input side of the heating furnace , and an influence coefficient representing the change in the temperature of the steel sheet on the output side of the heating furnace in response to the change in furnace temperature of each of the heating zones, using a capable heating model equation. of calculating the temperature of the steel sheet in the heating furnace by entering an adjusted value of the steel plate temperature on the inlet side of the heating furnace, and the adjusted values of the furnace temperature of each of the heating and speed zones plate passage; a control model adjustment unit that adjusts a control model by entering a kiln temperature change command value and taking the kiln temperature from each of the heating zones and the steel plate temperature on the output side of the Heating furnace, using the influence coefficient calculated by the influence coefficient calculation unit, the steel plate transfer time until the influence of the furnace temperature changes in each of the heating zones appears in the temperature of the steel plate. steel on the output side of the heating furnace, a constant time from when the furnace temperature change command value of each of the furnace heating zones is removed to when the furnace temperature is actually changed, and a variable representing an unknown temperature disturbance to be applied to the temperature of the steel sheet on the output side of the heating furnace; a state variable/disturbance evaluation unit that evaluates the values of a variable state and a temperature perturbation variable of the control model at the same time, introducing a deviation between an actual steel plate temperature value on the side of the heating furnace inlet measured by the plate temperature measuring unit and an adjusted value, a deviation between the current value of the steel plate temperature on the finishing furnace output side measured by the plate temperature measuring unit and an adjusted value, and a deviation between the actual value of the furnace temperature in each of the heating zones measured by the furnace temperature measuring unit and the adjusted initial value; an oven temperature change amount calculation unit that calculates an oven temperature change amount of each of the heating zones under a constraint condition such that the sum of the squares of a deviation between the target value and the value The actual temperature of the steel sheet on the output side of the heating furnace becomes minimal using the values of the state variable and the temperature of the perturbation variable from the control model which are evaluated by the variable/state evaluation unit. disturbance; and a furnace temperature control unit which controls the fuel flow rate used in each of the heating zones to achieve the furnace temperature change amount calculated by the furnace temperature change amount calculation unit.
    [11] Furthermore, in the steel sheet temperature control equipment according to the present invention, the furnace temperature change amount calculation unit includes at least one constraint condition relating to the upper and lower limit values of the furnace temperature, restriction conditions regarding the amount of change in the furnace temperature per unit of time, restriction conditions regarding the upper and lower limit values of the fuel flow rate, and condition regarding the amount of change of the flow rate of fuel per unit of time, as a condition of restriction.
    [12] In addition, in the steel sheet temperature control equipment according to the present invention, the influence coefficient calculation unit, the control model adjustment unit, the variable state/degree evaluation unit. disturbance, and the kiln temperature change amount calculation unit each perform a process for which the set value of a plurality of plate pass speeds assumed during an actual operation, and the temperature control unit The furnace controls the fuel flow rate used in each of the heating zones to achieve the amount of furnace temperature change calculated from the set plate pass speed value close to the actual plate pass speed.
    [13] In addition, a method of controlling steel sheet temperature in accordance with the present invention includes: a sheet temperature measurement step that measures the temperature of a steel sheet on an inlet side and on one side exit from a heating furnace including a plurality of heating zones disposed along the direction of transport of the steel sheet; an oven temperature measurement step that measures the oven temperature in each of the heating zones; an influence coefficient calculation step that calculates the influence coefficient representing the temperature change of the steel sheet on the output side of the heating furnace in response to the temperature change of the steel plate on the input side of the heating furnace, and an influence coefficient representing the change in temperature of the steel sheet on the output side of the heating furnace in response to the change in furnace temperature of each of the heating zones, using a heating model equation capable of calculating the temperature of the steel plate in the heating furnace, by entering an adjusted value of the temperature of the steel plate on the inlet side of the heating furnace, and adjusting values of the furnace temperature of each of the heating zones and the speed of passage of the plate; a control model adjustment step that adjusts the control model by introducing a kiln temperature change command value and removing the kiln temperature of each of the heating zones and the temperature of the steel plate in the output side of the heating furnace, using the influence coefficient calculated in the influence coefficient calculation step, the steel plate transfer time until the influence of the furnace temperature changes in each of the heating zones appears in the temperature of the steel sheet on the output side of the heating furnace, a time constant from when the furnace temperature change command value of each of the heating zones is removed to when the furnace temperature is actually changed, and a variable representing the unknown temperature disturbance to be applied to the temperature of the steel sheet on the output side of the heating furnace; a variable state/disturbance evaluation step that evaluates the values of a variable state and the temperature of the variable disturbance of the control model at the same time, introducing a deviation between the actual value of the steel plate temperature on the input side of the heating furnace measured in the plate temperature measurement step and the set value, a deviation between the actual value of the steel plate temperature on the output side of the heating furnace measured in the plate temperature measurement step and a value adjusted, and a deviation between an actual value of the furnace temperature in each of the heating zones measured in the step of measuring the furnace temperature and an adjusted initial value; a step of calculating the amount of change in oven temperature which calculates the amount of change in oven temperature of each of the heating zones under a constraint condition such that the sum of the squares sums the deviation between the target value and the The actual value of the steel sheet temperature on the output side of the heating furnace becomes minimal by using the variable state values and the temperature perturbation variable from the control model that are evaluated in the variable state evaluation step/ disturbance; and a step of controlling the furnace temperature which controls the fuel flow rate in each of the heating zones to achieve the furnace temperature change amount calculated in the step of calculating the furnace temperature change amount. Advantageous Effects of the Invention
    [14] With the steel sheet temperature control equipment and the steel sheet temperature control method according to the present invention, it is possible to control the temperature of a steel sheet in a heating furnace with a good responsiveness and good follow-up ability. Brief description of the drawings
    [15] Figure 1 is a block diagram illustrating a configuration of a steel sheet temperature control equipment according to an embodiment of the present invention. Figure 2 is a block diagram illustrating a configuration of temperature control equipment for a conventional steel sheet. output of a heating oven. Figure 4 is a diagram illustrating the furnace temperature of each heating zone and the temperature response of the steel sheet at the output side of the heating furnace in the method of the present invention. Figure 5 is a diagram illustrating the furnace temperature of each heating zone and the temperature response of the steel sheet on the output side of the heating furnace in a conventional method. Figure 6 is a diagram illustrating the disturbance applied to the temperature of the steel sheet on the output side of the heating furnace. Description of modalities
    [16] Hereinafter, the configuration of a steel plate temperature control equipment according to an embodiment of the present invention and its operation in relation to the attached drawings will be described in detail.
    [17] Figure 1 is a block diagram illustrating a configuration of a steel plate temperature control equipment according to the embodiment of the present invention. As illustrated in Figure 1, a steel sheet temperature control equipment 1 according to the embodiment of the present invention is an equipment that controls the temperature of a steel sheet in a heating furnace including n (> 1) pieces ( five in the present embodiment) of heating zones arranged along the direction of transport of the steel sheet.
    [18] The temperature control equipment of a steel sheet 1 according to the embodiment of the present invention includes a sheet temperature measuring unit 11, a temperature measuring unit of an oven 12, a temperature calculation unit influence coefficient 13, a control model adjustment unit 14, a variable state/disturbance evaluation unit 15, a furnace temperature change amount calculation unit 16, and a furnace temperature control unit 17 as main components.
    [19] The plate temperature measuring unit 11 measures the temperature (plate temperature) of a steel plate on the inlet side and on the outlet side of the heating furnace at each predetermined period, and delivers an electrical signal representing the plate temperature for variable state/disturbance evaluation unit 15.
    [20] The oven temperature measurement unit 12 measures the actual temperature value (oven temperature) of each heating zone in the heating oven in each predetermined period, and delivers an electrical signal representing the measured oven temperature of each heating zone, for the variable state/disturbance evaluation unit 15, the furnace temperature change amount calculation unit 16, and the furnace temperature control unit 17.
    [21] The influence coefficient calculation unit 13 obtains a setting value of the temperature of the steel sheet at the inlet side of the heating furnace, a setting value of the furnace temperature, and a setting value of the pass speed of the plate of each heating zone which are taken from a process computer 21 in response to receiving an annealing command from the steel plate. The influence coefficient calculation unit 13 calculates an influence coefficient representing the change in temperature of the steel sheet at the output side of the heating furnace in response to the temperature change of the steel plate at the input side of the heating furnace , and an influence coefficient representing the change in the temperature of the steel sheet at the output side of the heating furnace in response to the change in temperature of the steel sheet in each heating zone, using information obtained from the process computer 21. A The influence coefficient calculation unit 13 then delivers electrical signals representing the influence coefficients to the control model fit unit 14. A method for the calculation of the influence coefficient will now be described.
    [22] When the set value of the steel plate temperature at the inlet side of the heating furnace is Tin, the set value of the plate pass speed is Vs, and the set value for the furnace temperature of each heating zone is Twi (i = 1 to 5), the temperature Ts of the steel plate on the output side of the heating furnace is represented by Ts = f (Tin, Vs, Tw1, Tw2, Tw3, Tw4, Tw5). In this example, the function f is a model equation for heating a steel sheet in the heating furnace based on equation (1) below. In calculating a numerical value, equation (1) calculates the difference by discretizing in a step of sufficient time Δt. In equation (1), p represents the specific heat [kcal/kg/K] of the steel sheet, C represents the specific gravity [kg/m3] of the steel sheet, h represents the thickness [m] of the sheet's sheet, Ts represents the temperature [°C] of the steel plate, Tw represents the furnace temperature [°C], Φcg represents the total heat transfer coefficient [- ], a represents the Stefan-Boltzmann constant (= 1.3565e -11 [kcal/s/m2/K4]), t represents the time [s]. g
    [23] The influence coefficient calculation unit 13 calculates the influence coefficient using information obtained from the process computer 21, and using equations (2) to (7) below. In this example, equation (2) represents an influence coefficient that expresses the temperature change of the steel sheet on the output side of the heating furnace in response to the temperature change of the steel plate on the input side of the heating furnace, and d1 in equation (2) represents a variable that represents the temperature variation of the steel sheet on the inlet side of the heating furnace. Equations (3) to (7) represent the influence coefficients that express the change in the temperature of the steel sheet on the output side of the heating furnace in response to the change in temperature of the steel sheet in each heating zone.

    [24] The adjustment unit of the control model 14 obtains from the process computer 21 the adjustment value of the speed of passage of the plate of each heating zone and the time constant of the temperature of the furnace. The control model adjustment unit 14 calculates the control model equation required in the variable state/disturbance evaluation unit 15 and the furnace temperature change amount calculation unit 16 using the information obtained from the computer 21. The control model fit unit 14 then delivers an electrical signal representing a parameter of the control model equation calculated to the variable state/disturbance evaluation unit 15 and to the quantity calculation unit. Oven temperature change 16. A method for calculating the control model equation will now be described.
    [25] When the transfer time L1 [s] to transfer a steel plate from the inlet position of the 1st heating zone to the position on the output side of the heating oven (distance/set value of the speed of passage of the platen position from the inlet side of the heating zone i to the outlet side of the heating furnace) is required, the temperature Ts of the steel sheet on the output side of the heating furnace is represented by equation (8) below using the coefficient of influence in equations (2) to (7). In this example, ΔTwi in equation (8) is a differential value between the actual value of the furnace temperature and the adjusted value of the furnace temperature of each heating zone, and represents the variation of the furnace temperature. Also, s is a Laplace operator.

    [26] It is considered that a feedback control system is built from the kiln temperature command value to the actual kiln temperature value, and the kiln temperature control system can be approximated by the dynamic characteristic described in equation (9) below. In this example, ΔTwiref in equation (9) represents the target furnace temperature value of each heating zone, and Ti represents the time constant from the furnace temperature command value to the actual furnace temperature value of each heating zone. heating.

    [27] It is also assumed that the e-Lis transfer time element in equation (8) can be linearized by the Pade approximation as illustrated in Equation (10) below. Equation (10) is a third-order equation. However, the order of the equation can be properly adjusted by the designer. When equation (10) is expressed in state space representation, equation (11) below can be obtained. In equation (11), x1, x2, and x3 are internal state variables, and can be optionally implemented. Consequently, x1, x2, and x3 have no physical meaning.

    [28] When equation (8) and equation (11) are considered together, the state space representations for the temperature variation of the Tsi plate from the temperature variation of the DTwi furnace of each heating zone and the Temperature variation d1 of the steel sheet on the inlet side of the heating furnace are expressed by equations (12) and (13) below. In this example, equation (12) represents the equation for the first heating zone, together, the state space representations for the temperature variation of the sheet Tsi from the furnace temperature variation ΔTwi of each heating zone and the Temperature variation d1 of the steel sheet on the inlet side of the heating furnace are expressed by equations (12) and (13) below. In this example, equation (12) represents the equation for the first heat zone, and equation (13) represents the equation for the second through fifth heat zone. In addition, Tsi represents the plate temperature variable indicating the 8th term in equation (8).

    [29] In addition, the equation representation of dynamic characteristics of the furnace temperature control system represented by equation (9) is expressed as equation (14) below.

    [30] The output that can be observed from the furnace temperature control system is the furnace temperature variable ΔTwi of each heating zone and the temperature Ts of the steel plate on the output side of the heating furnace. When an unknown variable d2 indicating a disturbance applied to the temperature of the steel sheet on the output side of the heating furnace is introduced into the temperature Ts of the steel sheet, the temperature Ts of the steel sheet is expressed by equation (15) below. When it is considered that the time difference of the temperature variable d1 of the steel sheet on the input side of the steel sheet is 0, as expressed by equation (16), the state space representation expressed by equation (17) below is obtained from equations (12) to (16).

    [31] The control model fit unit 14 then delivers the result obtained by discretizing the matrices A to F in equation (17) (hereinafter the continuous-time representation and the discrete-time representation are represented by the same symbol) by the control period, for the variable state/disturbance evaluation unit 15 and the furnace temperature change amount calculation unit 16, as a parameter of the control model equation.
    [32] The state variable/disturb evaluation unit 15 evaluates the state variable and the perturbation variable of the control model equation calculated by the control model fit unit 14 in each control period, using such an evaluation method. as observer and Kalman filter, and delivers electrical signals representing the evaluated values to the furnace temperature change amount calculation unit 16. When the observer is used for evaluation, the state variable/disturbance evaluation unit 15 modifies the equation (17) to equation (18) below. The variable state/disturbance evaluation unit 15 then projects an observer into the system. Equation (19) below is the observer, and is obtained by multiplying the observer gain L by a deviation between the observed value y and the model's forecast value, while adjusting the estimated state value for x' and the estimated value of perturbation for d2'. Equation (19) below updates the estimated values or the amount of state and disturbance. In equation (19), u(k) represents the target value of the furnace temperature of each input to the heating zone by the furnace temperature control unit 17. To project the observer gain, a design method has been known to stabilize the system (eg System Control Theory Introduction (Jikkyo Shuppan, 1979)).

    [33] The kiln temperature change amount calculation unit 16 calculates the kiln temperature change amount so that the sum of squares of the sum of the deviation between the target value and the actual steel plate temperature value on the output side of the heating furnace becomes minimal, in other words, the variation from the target value of the steel sheet temperature on the output side of the heating furnace becomes minimal using the evaluated values of the variable state and the delivery of the disturbance variable from the state variable/disturbance evaluation unit 15. This leads to a problem of minimizing the desired function under constraint conditions. More specifically, although equation (18) is already obtained as the control model equation, the input is modified as equation (20) below to deal with the restriction of the target furnace temperature range variation. The furnace temperature change amount calculation unit 16 then calculates the amount of furnace temperature change Δu(k) by which the temperature change of the sheet Ts2 becomes minimal using the control model equation. This is an optimization problem for calculating the time data series of the amount of change in furnace temperature Δu(k) to minimize the evaluation function expressed by equation (21) below.

    [34] In this example, the output values of the state variable/disturb evaluation unit 15 are used as initial values for the state variable and the disturbance variable. In equation (21), x(k)T represents the transport of a vector. N in equation (21) is the forecast period and means that the future control period N is evaluated from the current time. By setting Q = cTc (c represents the last line corresponding to the temperature of the matrix steel sheet [CF O6x5]), the evaluation function can minimize the temperature variation of the steel sheet including the disturbance on the input side and on the output side of the heating oven.
    [35] In addition, constraint conditions include constraint conditions relating to upper and lower limit values of the furnace temperature, constraint conditions relating to the amount of change in oven temperature per unit of time, constraint conditions relating to limit values upper and lower fuel flow rate, and conditions relating to the amount of change in fuel flow rate per unit of time. In addition, it is possible to obtain a relationship between the fuel flow rate and the target kiln temperature value u(k) and integrate the relationship into constraints, or constrain the target kiln temperature value u(k). , it is possible to integrate the restriction conditions of the operation. Among the time data series of the furnace temperature change amount Δu(k) calculated in this process, the furnace temperature change amount calculation unit 16 delivers the furnace temperature change amount Δu(k) of first up to the oven temperature control unit 17.
    [36] The kiln temperature control unit 17 adds the amount of change from the kiln temperature Δu(0) to the current target kiln temperature, and adjusts the usage amount of the fuel amount flow rate in each heating zone to achieve the goal, It is preferable that the influence coefficient calculation unit 13, the control model adjustment unit 14, the variable state/disturbance evaluation unit 15, and the quantity calculation unit temperature changers of the furnace 16 each perform a process for each setting value of a plurality of plate pass speeds that can be considered during the actual operation. It is also preferable that the kiln temperature control unit 17 control the fuel flow rate used in each heating zone to achieve the amount of change in the kiln temperature calculated from the adjusted plate pass speed value close to the actual plate pass speed.
    [37] As is evident from the above description, in the steel sheet temperature control equipment 1 according to the modality of the present invention, the state variable/disturbance evaluation unit 15 evaluates the value of the state variable and the variable of temperature perturbation of the control model at the same time. In addition, the furnace temperature change amount calculation unit 16 calculates the oven temperature change amount of each heating zone under the constraint condition so that the sum of the squares of the sum of the deviation between the target value and the actual value of the steel sheet temperature on the output side of the heating furnace becomes minimal using the values of the state variable and the temperature perturbation variable from the control model. In addition, the kiln temperature control unit 17 controls the fuel flow rate used in each heating zone to achieve the calculated kiln temperature change amount. Consequently, it is possible to control the temperature of the steel sheet in the heating furnace with good responsiveness and good followability. Examples
    [38] The effectiveness of the method of the present invention was validated by simulation. The set values for the heating zones are described in Table 1 below and the set values for the steel sheets are described in Table 2 below. As a constraint condition of the method of the present invention, the target amount of change in oven temperature (°C/sec) in all heating zones is set equal to or less than ±1.0°C/sec. The prediction period N of the evaluation function is set to 30. Meanwhile, an example configuration of a conventional method is illustrated in Figure 2. As illustrated in Figure 2, in the exemplary configuration of the conventional method, the plate temperature variation due to temperature disturbance on the inlet side of the heating furnace is suppressed by direct feed (FF) control (FF correction), and the actual control deviation of the steel sheet temperature on the output side of the heating furnace is suppressed by controlling the proportional-integral derivative (PID) (feedback correction (FB)). The two controls are designed independently, and the conventional method differs from the method of the present invention in that the information of the oven temperature correction values is not exchanged with each other. The feedback control calculates the amount of furnace temperature change to remove the influence of the disturbance, which is applied to the temperature of the steel plate on the inlet side of the heating furnace, applied to the temperature of the steel plate on the output side of the heating oven using the influence coefficients. To compare the responses between the method of the present invention and the conventional method when the disturbance is applied, the disturbance shown in Figure 3 is applied to the temperature of the steel sheet in the inlet side and in the outlet side of the heating furnace. Table 1
    Table 2

    [39] The furnace temperatures of the heating zones (1 to 5z) and the temperature response of the steel sheet on the output side of the heating furnace in the method of the present invention are illustrated in Figures 4(a) and 4(b) ). The furnace temperatures of the heating zones (1 to 5z) and the temperature response of the steel sheet on the output side of the conventional method heating furnace are illustrated in Figures 5(a) and (b). As illustrated in Figures 4(a) and (b), in the method of the present invention, the temperature of the steel sheet at the output side of the heating furnace is converged to the target value (0°C) for at least about 60 seconds they passed. Alternatively, as illustrated in Figures 5(a) and (b), in the conventional method, the control deviation is still present in the steel sheet temperature on the output side of the heating furnace even though 100 seconds or more has passed. In this way, it was confirmed that the time required for the temperature of the steel sheet on the output side of the heating furnace to converge to the target value is short, and the control deviation is eliminated in the method of the present invention.
    [40] The difference between the method of the present invention and the conventional method is the directivity of the amount of change in the furnace temperature when the disturbance is applied to the temperature of the steel plate at the inlet side of the heating furnace. In other words, in the conventional method, even when the temperature of the steel plate on the output side of the heating furnace is lower than the target value, the furnace temperature is decreased when the positive disturbance is applied to the temperature of the steel plate in the inlet side of the heating oven. However, this is the reverse operation when viewed from the temperature of the steel sheet on the output side of the heating furnace. Thus, the oven temperature varies, and it takes time to converge. Alternatively, in the method of the present invention, even when the positive disturbance is applied to the temperature of the steel plate at the inlet side of the heating furnace, when the current temperature of the steel plate at the output side of the heating furnace is less than the target value, the oven temperature will not be lowered, and the oven temperature is controlled to a condition that can eventually eliminate the deviation from steady state. This is because the disturbance applied to the temperature of the steel sheet on the output side of the heating furnace is evaluated for each control period as illustrated in Figure 6, and an adequate operating amount is optimally calculated.
    [41] Although the embodiment has been described in accordance with the invention made by the present inventors, the present invention is not limited to the description and drawings which form a part of the description of the present invention in accordance with the present embodiment. That is, all other embodiments made by those skilled in the art based on the present embodiment, examples of operating techniques, etc., are all included within the scope of the present invention. industrial applicability
    [42] With the present invention, it is possible to provide steel sheet temperature control equipment and steel sheet temperature control method that can control the temperature of a steel sheet in a heating furnace with a good responsiveness and good follow-up ability. List of reference signals 1 Steel sheet temperature control equipment 11 Sheet temperature measuring unit 12 Oven temperature measuring unit 13 Influence coefficient calculation unit 14 Control model setting unit 15 Unit of variable state evaluation/disturbance 16 Oven temperature change amount calculation unit 17 Oven temperature control unit
    权利要求:
    Claims (4)
    [0001]
    1. Steel sheet temperature control equipment characterized in that it comprises: a sheet temperature measuring unit that measures the temperature of a steel sheet on an inlet side and an outlet side of a furnace. heating including a plurality of heating zones disposed along the direction of transport of the steel sheet; an oven temperature measuring unit, which measures the oven temperature in each heating zone; an influence coefficient calculation unit that calculates the influence coefficient representing the temperature change of the steel sheet at the output side of the heating furnace in response to the temperature change of the steel plate at the input side of the heating furnace, and an influence coefficient representing the change in temperature of the steel sheet on the output side of the heating furnace in response to the change in furnace temperature of each heating zone, using a heating model equation capable of calculating the temperature of the plate. of steel in the heating furnace, entering an adjusted value of the temperature of the steel plate on the inlet side of the heating furnace and adjusting the values of the furnace temperature of each of the heating zones and the speed of passage of the plate; a control model adjustment unit that adjusts the control model by inputting a kiln temperature change command value and taking the kiln temperature of each heating zone and the steel plate temperature on the output side of the kiln. heating, using the influence coefficient calculated by the influence coefficient calculation unit, the steel plate transfer time until the influence of the furnace temperature change in each of the heating zones appears on the steel plate temperature in the output side of the heating furnace, the time constant from when the furnace temperature change command value of each heating zone is delivered to when the furnace temperature is actually changed, and a variable representing unknown temperature disturbances to be applied at temperature to the steel plate on the output side of the heating furnace; a state variable/disturbance evaluation unit that evaluates values of a state variable and a temperature perturbation variable from the control model at the same time, introducing a deviation between the actual steel plate temperature value on the input side of the heating furnace measured by the plate temperature measuring unit and the set value, a deviation between the actual value of the steel plate temperature on the output side of the heating furnace measured by the plate temperature measuring unit and an adjusted value , and a deviation between the actual value of the oven temperature of each of the heating zones measured by the oven temperature measuring unit and the set initial value; a unit for calculating the amount of change in oven temperature that calculates the amount of change in oven temperature of each heating zone under the constraint condition such that the sum of the squares sums the deviation between the target value and the actual value The temperature of the steel sheet on the output side of the heating furnace becomes minimal using the values of the state variable and the temperature perturbation variable from the control model which are evaluated by the state variable/disturbance evaluation unit ; and a kiln temperature control unit which controls the fuel flow rate used in each heating zone to achieve the kiln temperature change amount calculated by the kiln temperature change amount calculation unit.
    [0002]
    2. Steel sheet temperature control equipment according to claim 1, characterized in that the unit for calculating the amount of change in the furnace temperature includes at least one of the restriction conditions relating to the upper and lower limit values of the furnace temperature, restriction conditions regarding the amount of change in the furnace temperature per unit of time, restriction conditions regarding the upper and lower limit values of the fuel flow rate, and condition reactive to the amount of change of the flow rate of fuel per unit of time, such as restriction conditions.
    [0003]
    3. Steel sheet temperature control equipment according to claim 1 or 2, characterized in that the influence coefficient calculation unit, the control model adjustment unit, the variable state evaluation unit /disturbance, and the furnace temperature change amount calculation unit, each performs a process for each set value of a plurality of plate passage speeds assimilable during an actual operation, and the furnace temperature control unit controls the flow rate of fuel used in each of the heating zones to achieve the amount of kiln temperature change calculated from the set plate pass speed value close to the actual plate pass speed.
    [0004]
    4. Method of controlling the temperature of the steel sheet, characterized in that it comprises: a step of measuring the temperature of the sheet that measures the temperature of a steel sheet on an inlet and an outlet side of a furnace heating zones including a plurality of heating zones disposed along the direction of transport of the steel sheet; an oven temperature measurement step that measures the oven temperature of each of the heating zones; an influence coefficient calculation step that calculates the influence coefficient representing the temperature change of the steel sheet at the output side of the heating furnace in response to the temperature change of the steel plate at the input side of the heating furnace , and an influence coefficient representing the change in temperature of the steel sheet on the output side of the heating furnace in response to the change in furnace temperature of each of the heating zones, using a heating model equation capable of calculating the temperature of the steel sheet in the heating furnace, by entering an adjusted value of the temperature of the steel plate on the inlet side of the heating furnace, and adjusting values of the furnace temperatures of each of the heating zones and the speed of plate passage; a control model adjustment step that adjusts a control model by entering a kiln temperature change command value and removing the kiln temperature of each of the heating zones and the temperature of the steel plate in the output side of the heating furnace, using the influence coefficient calculated in the influence coefficient calculation step, the steel plate transfer time until the influence of the furnace temperature change in each of the heating zones appears in the temperature of the steel sheet on the output side of the heating furnace, the time constant from when the furnace temperature change command value of each of the heating zones is taken to when the furnace temperature is actually changed, and a variable representing an unknown temperature disturbance to be applied to the temperature of the steel sheet at the output side of the heating furnace; a state variable/disturbance evaluation step that evaluates the values of a state variable and a temperature perturbation variable of the control model at the same time, introducing a deviation between the actual temperature value of the steel sheet in the inlet side of the heating furnace measured in the plate temperature measurement step and an adjusted value, a deviation between the actual plate temperature value on the heating furnace output side measured in the plate temperature measurement step, and a set value, and a deviation between the actual oven temperature value of each of the heating zones measured in the oven temperature measurement step and the set initial value; a kiln temperature change amount calculation step that calculates the kiln temperature change amount of each of the heating zones under a constraint condition such that the sum of the squares of the sum of a deviation between the target value and the actual value of the steel sheet temperature on the output side of the heating furnace becomes minimal using the values of the state variable and the temperature perturbation variable from the control model that are evaluated in the step of assessment of variable/disturbed status; and a furnace temperature control step that controls the fuel flow rate used in each of the heating zones to achieve the furnace temperature change amount calculated in the furnace temperature change amount calculation step.
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    同族专利:
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    JP6146553B1|2017-06-14|
    JPWO2017130508A1|2018-02-01|
    BR112018013742A2|2018-12-11|
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    法律状态:
    2020-03-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-07-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-24| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    2021-08-31| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 02/11/2016, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2016-014429|2016-01-28|
    JP2016014429|2016-01-28|
    PCT/JP2016/082552|WO2017130508A1|2016-01-28|2016-11-02|Steel sheet temperature control device and temperature control method|
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