Temperature control device and method for superheated steam of boiler

Abstract

The invention relates to the technical field of automatic control, in particular to a temperature control device and method for boiler superheated steam, and the method comprises the steps that a first control device comprises a first actuator, a first controller and a temperature collection module, so that a first-stage control loop is formed; the second control device comprises a second actuator, a second controller and a feedforward controller to form a second-stage control loop, the first-stage control loop is used for collecting the actual temperature of a middle point in the boiler in real time and adjusting the actual temperature of the middle point to the preset temperature of the middle point, and the second-stage control loop is used for controlling the boiler to work based on the preset temperature of the middle point. And the actual temperature of the superheated steam in the boiler is adjusted to the preset temperature of the superheated steam. Therefore, the problems that in the related technology, the control precision is low, the execution speed is low, the flexibility and expansibility of the system are limited, and different working conditions and requirements cannot be met are solved.

Description

Technical Field

[0001] This application relates to the field of automatic control technology, and particularly to a temperature control device and method for superheated steam in a boiler. Background Art

[0002] Under the "dual carbon" goal, significant changes have occurred in the power source structure and power consumption structure of the power system. Higher requirements are put forward for the frequency regulation performance and rapid response capabilities of large-scale wind, light, etc. The intervention of intermittent power sources also poses higher requirements for the load change rate of thermal power generating units.

[0003] In related technologies, for a supercritical once-through boiler in a primary feedwater heating system, a desuperheating water control panel can be set at the inlet of the final superheater to control the main steam temperature at the outlet of the platen superheater. The desuperheating water uses an electric regulating device, introduces a dual-loop cascade PID (Proportional Integral Derivative) controller, and makes the main steam temperature meet the conditions by establishing a fuzzy system; alternatively, through mathematical modeling and constructing a state observer based on output feedback, the MPC (Model Predictive Control) controller and the PID regulator are cascaded to form a cascade control loop, and then the desuperheating water valve control signal is adjusted according to the deviation between the leading temperature and the output of the MPC controller.

[0004] However, in related technologies, the dual-loop fuzzy control requires regular maintenance of the rule base. If there is a lack of an effective data-driven mechanism, it will lead to response lag or overshoot, affecting the control accuracy and speed; using a state observer involves multiple control links and parameters, restricting the flexibility and expandability of the system, and unable to face different working conditions and requirements, so improvement is urgently needed. Summary of the Invention

[0005] This application provides a temperature control device and method for superheated steam in a boiler to solve the problems in related technologies, such as low control accuracy, slow execution speed, restricting the flexibility and expandability of the system, and being unable to face different working conditions and requirements.

[0006] In a first aspect embodiment of this application, a temperature control device for superheated steam in a boiler is provided, including: a first control device, the first control device includes a first actuator, a first controller, and a temperature acquisition module to form a primary control loop; a second control device, the second control device includes a second actuator, a second controller, and a feedforward controller to form a secondary control loop, wherein the primary control loop is used to collect the actual temperature of the intermediate point in the boiler in real time and adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point, and the secondary control loop adjusts the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam based on the preset temperature of the intermediate point.

[0007] Through the above technical solution, a primary control loop can be formed by using a first actuator, a first controller, and a temperature acquisition module, and a secondary control loop can be formed by using a second actuator, a second controller, and a feedforward controller. The actual temperature of the intermediate point is collected in real time through the primary control loop, and the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point. The actual temperature of the superheated steam is adjusted to the preset temperature of the superheated steam through the secondary control loop, thereby ensuring the stability and accuracy of the intermediate point temperature, achieving precise control of the superheated steam temperature, enhancing system stability, improving response speed and efficiency, and being able to adapt to different working conditions and requirements.

[0008] Optionally, in an embodiment of the present application, the first controller includes: a first input unit for obtaining the actual temperature of the intermediate point of the boiler; a first calculation unit for calculating a first error between the preset temperature of the intermediate point and the actual temperature of the intermediate point.

[0009] Through the above technical solution, the actual temperature of the intermediate point can be obtained in real time by using the first input unit, and the error between the preset temperature and the actual temperature of the intermediate point can be calculated by using the first calculation unit. Thus, the control device can timely understand the operating state of the boiler, more accurately reflect the current working condition information of the boiler, improve control accuracy and system stability by accurately calculating the error, and provide the possibility for rapid response and adjustment.

[0010] Optionally, in an embodiment of the present application, the first actuator includes: a first acquisition unit for obtaining a first target parameter in the primary control loop; a first adjustment unit for adjusting the first error according to the first target parameter by a first preset step length to adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point.

[0011] Through the above technical solution, the target parameter in the primary control loop can be obtained by using the first acquisition unit, and the actual temperature of the intermediate point can be adjusted to the preset temperature of the intermediate point according to the first preset step length in the first adjustment unit. Adjusting the first error by the first preset step length helps to avoid over-adjustment, achieve a smooth adjustment of the actual temperature of the intermediate point to the preset temperature, improve the stability and reliability of the system, gradually reduce the error, improve control accuracy, achieve precise control, and improve dynamic performance.

[0012] Optionally, in an embodiment of the present application, the second controller includes: a second input unit for obtaining the actual temperature of the superheated steam in the boiler; a second calculation unit for calculating a second error between the preset temperature of the superheated steam and the actual temperature of the superheated steam.

[0013] Through the above technical solution, the actual temperature of the superheated steam can be obtained through the second input unit, and the error between the preset temperature and the actual temperature of the superheated steam can be calculated by the second calculation unit, enabling timely understanding of the temperature state of the superheated steam, providing the possibility for rapid response and adjustment. By accurately calculating the error, the control accuracy and the stability of the system are improved, which helps to improve the overall efficiency of the boiler.

[0014] Optionally, in an embodiment of the present application, the second actuator includes: a second acquisition unit for acquiring a second target parameter in the secondary control loop; a second adjustment unit for adjusting the second error according to a second preset step size by using the second target parameter to adjust the actual temperature of the superheated steam to the preset temperature of the superheated steam.

[0015] Through the above technical solution, the second target parameter in the secondary control loop can be obtained through the second acquisition unit, and the second error can be adjusted according to the second preset step size in the second adjustment unit until the actual temperature of the superheated steam reaches the preset temperature. By gradually adjusting the error and avoiding over-adjustment, the actual temperature of the superheated steam can be adjusted to the preset temperature more smoothly, improving the stability and reliability of the system.

[0016] Optionally, in an embodiment of the present application, the transfer functions of the first controller and the second controller can be, but are not limited to:

[0017]

[0018] where k is the controller proportionality coefficient, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

[0019] Through the above technical solution, by generating the transfer functions of the first controller and the second controller, the control device can respond faster to temperature changes while maintaining the stability and reliability of the system.

[0020] Optionally, in an embodiment of the present application, the expression of the feedforward controller can be, but is not limited to:

[0021]

[0022] where P e is the unit load increase rate, d0 is the feedforward weighting coefficient, and τ0 is the calculated value of the intermediate point temperature rise.

[0023] Through the above technical solution, the expression of the feedforward controller can be designed, and the unit load increase rate, the feedforward weighting coefficient, and the calculated value of the intermediate point temperature rise are used as input parameters, so that the control device can respond to load changes faster, ensure that the control device can operate stably under various working conditions, reduce temperature fluctuations, adjust the temperature of the superheated steam in a timely manner, optimize the operating parameters of the boiler, improve the steam quality, and improve the control accuracy.

[0024] Optionally, in an embodiment of the present application,

[0025] The mathematical expression of the primary control loop can be, but is not limited to:

[0026]

[0027] where K1 is the steady-state gain, T1 is the time parameter, and τ1 is the delay time;

[0028] The mathematical expression of the secondary control loop can be, but is not limited to:

[0029]

[0030] where K2 is the steady-state gain, T2 is the time parameter, and τ2 is the delay time.

[0031] Through the above technical solution, the steady-state gain, the time parameter, and the delay time can be calculated using the control loop, so that the control device can respond to temperature changes more quickly, adjust the temperature of the superheated steam in a timely manner, optimize the operating parameters of the boiler, improve the steam quality, be more widely applied to different working environments and working condition changes, and improve the reliability and robustness of the system.

[0032] An embodiment of the second aspect of the present application provides a method for controlling the temperature of superheated steam in a boiler, including the following steps: real-time collecting the actual temperature of the intermediate point in the boiler; adjusting the actual temperature of the intermediate point to the preset temperature of the intermediate point; based on the preset temperature of the intermediate point, adjusting the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam.

[0033] Through the above technical solution, the actual temperature of the intermediate point collected in real time can be adjusted to the preset temperature of the intermediate point, thereby realizing the adjustment of the superheated steam temperature, timely and accurately understanding the operating state of the boiler, quickly responding to temperature changes, optimizing the operating parameters of the boiler, improving the steam quality, reducing temperature fluctuations, and improving the stability of the system.

[0034] An embodiment of the third aspect of the present application provides an electronic device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the method for controlling the temperature of superheated steam in a boiler as described in the above embodiment.

[0035] In the fourth aspect of the embodiments of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program, and when the program is executed by a processor, the temperature control method of the boiler superheated steam as described above is implemented.

[0036] In the fifth aspect of the embodiments of the present application, a computer program product is provided, including a computer program, and when the program is executed, the temperature control method of the boiler superheated steam as described above is implemented.

[0037] The embodiments of the present application can form a primary control loop using a first actuator, a first controller, and a temperature acquisition module, and form a secondary control loop using a second actuator, a second controller, and a feedforward controller. The actual temperature of the intermediate point is collected in real time through the primary control loop, and the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point. The actual temperature of the superheated steam is adjusted to the preset temperature of the superheated steam through the secondary control loop, thereby ensuring the stability and accuracy of the intermediate point temperature, achieving precise control of the superheated steam temperature, enhancing system stability, improving response speed and efficiency, and being able to adapt to different working conditions and requirements. Thus, the problems in the related art, such as low control accuracy, slow execution speed, limited flexibility and scalability of the system, and inability to face different working conditions and requirements, are solved.

[0038] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, where:

[0040] Figure 1 is a block diagram of a temperature control device for boiler superheated steam according to an embodiment of the present application;

[0041] Figure 2 is a flowchart of the working principle of a temperature control device for boiler superheated steam according to an embodiment of the present application;

[0042] Figure 3 is a flowchart of a temperature control method for boiler superheated steam according to an embodiment of the present application;

[0043] Figure 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, but should not be construed as limiting the present application.

[0045] The temperature control device and method for superheated steam of a boiler according to an embodiment of the present application will be described below with reference to the accompanying drawings. In view of the problems of low control accuracy, slow execution speed, limited flexibility and scalability of the system, and inability to face different working conditions and requirements mentioned in the above background art, the present application provides a temperature control device for superheated steam of a boiler. In this device, a primary control loop can be composed of a first actuator, a first controller, and a temperature acquisition module, and a secondary control loop can be composed of a second actuator, a second controller, and a feedforward controller. The actual temperature of the intermediate point is collected in real time through the primary control loop, and the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point. The actual temperature of the superheated steam is adjusted to the preset temperature of the superheated steam through the secondary control loop, thereby ensuring the stability and accuracy of the intermediate point temperature, achieving precise control of the superheated steam temperature, enhancing the system stability, improving the response speed and efficiency, and being able to adapt to different working conditions and requirements. Thus, the problems of low control accuracy, slow execution speed, limited flexibility and scalability of the system, and inability to face different working conditions and requirements in the related art are solved.

[0046] Specifically, Figure 1 FIG. is a schematic block diagram of a temperature control device for superheated steam of a boiler according to an embodiment of the present application.

[0047] As Figure 1 shown, the temperature control device 10 for superheated steam of a boiler includes: a first control device 100 and a second control device 200.

[0048] Among them, the first control device 100, the first control device includes a first actuator, a first controller, and a temperature acquisition module to form a primary control loop. Among them, the primary control loop is used to collect the actual temperature of the intermediate point in the boiler in real time and adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point. The mathematical expression of the primary control loop can be but is not limited to:

[0049]

[0050] Among them, K1 is the steady-state gain, T1 is the time parameter, and τ1 is the delay time.

[0051] It can be understood that, in the embodiment of the present application, the first actuator can be a steam flow regulating valve G1.

[0052] In some embodiments, the first control device 100 of the embodiments of the present application includes a steam flow regulating valve G1, and also includes a first controller Z1, a temperature acquisition module, etc., and further forms a primary control loop through the steam flow regulating valve G1, the first controller Z1, and the temperature acquisition module.

[0053] In addition, in the embodiments of the present application, the controlled object of the primary control loop is the temperature of the intermediate point. By collecting the actual temperature of the boiler intermediate point in real time and adjusting the actual temperature of the intermediate point to the preset temperature of the intermediate point. Among them, the preset temperature of the intermediate point can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0054] It should be noted that the embodiments of the present application can carry out a dynamic response test on the primary control loop to determine the step response model of the controlled object of the primary control loop, and then determine parameters such as the steady-state gain K1, the time parameter T1, the delay time τ1, and the open-loop regulation time. Among them, the mathematical expression of the controlled object of the primary control loop can be, but is not limited to:

[0055]

[0056] Among them, K1 is the steady-state gain, T1 is the time parameter, and τ1 is the delay time.

[0057] Furthermore, the principle of using the steam flow regulating valve G1 to control the primary control loop in the embodiments of the present application is as follows: The high-pressure working medium hot water storage tank stores undersaturated steam. During the rapid load increase process of the unit, the steam flow regulating valve G1 opens, and the undersaturated steam enters the steam-water separator, directly increasing the flow rate at the outlet of the steam-water separator to meet the load increase demand of the unit. At this time, the embodiments of the present application can control the intermediate point temperature (i.e., the outlet temperature of the separator) through the steam flow regulating valve G1 to ensure the stable and controllable operation of the unit during the deep load process.

[0058] Optionally, in an embodiment of the present application, the first controller includes: a first input unit for obtaining the actual temperature of the intermediate point of the boiler; a first calculation unit for calculating the first error between the preset temperature of the intermediate point and the actual temperature of the intermediate point. Among them, the transfer function of the first controller can be, but is not limited to:

[0059]

[0060] Among them, k is the controller proportional coefficient, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

[0061] In some embodiments, the input of the first controller Z1 in the embodiments of the present application is the first error obtained by subtracting the preset temperature R at the intermediate point from the actual temperature Y at the intermediate point. The output of the first controller Z1 is U1. Then, U1 = Z1(R - Y) = eZ1, where U1 is the input value of the steam flow regulating valve G1.

[0062] Furthermore, in the embodiments of the present application, the transfer function of the first controller can be, but is not limited to:

[0063]

[0064] where k is the controller proportionality coefficient, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

[0065] In addition, it should be noted that the conversion relationship between the first controller in the embodiments of the present application and the traditional PID controller can be, but is not limited to:

[0066]

[0067] where T i , K p , T d , K d are respectively the integral time, proportionality coefficient, derivative time, and derivative coefficient of the traditional PID controller.

[0068] Furthermore, the embodiments of the present application can calculate the initial value of T c using the step response model, where and the PID control module of the DCS (Distributed Control System) control system of a thermal power unit has four parameters to be set, which can be T i , K p , T d , K d , and they can be obtained according to the conversion formula between T c and the initial parameters of the PID control module. The following is the expression of the conversion formula, which can be, but is not limited to, expressed as:

[0069] k p = 2αλ - λ 2 , k d = (1 - 2αλ + λ 2 ),

[0070] where

[0071] Further, during actual debugging of the embodiments of the present application, the initial value of λ can be selected as 0.1. Further, in the embodiments of the present application, λ can be gradually increased or decreased from the initial value. Each time T is increased c , then from half of the value of T c , the controller gain coefficient λ is gradually adjusted so that the closed-loop control effect meets the performance index, and the parameters λ, α, and T c are substituted into the above conversion formula, and then configured in the PID control module of the DCS control system.

[0072] Optionally, in an embodiment of the present application, the first actuator includes: a first acquisition unit for acquiring a first target parameter in the primary control loop; a first adjustment unit for adjusting the first error according to the first target parameter at a first preset step length to adjust the actual temperature at the intermediate point to the preset temperature at the intermediate point.

[0073] In some embodiments, after the temperature at the intermediate point of the embodiments of the present application is adjusted by the steam flow regulating valve G1, the temperature at the intermediate point changes, and the actual temperature at the intermediate point updated through the temperature acquisition module is Y1.

[0074] Further, the content of adjusting the temperature at the intermediate point in the embodiments of the present application can be: setting the second actuator to manual control, putting the primary control loop into automatic, and adjusting the first target parameters λ and α at a first preset step length, such as 0.1, until the actual temperature at the intermediate point is adjusted to the preset temperature at the intermediate point. Among them, the initial value of λ is selected as 0.1, the adjustment range of λ is 0 < λ < min(1, 2α); the damping ratio α has a value range of 0 < α < 1.

[0075] In addition, in the embodiments of the present application, the first preset step length can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0076] The second control device 200, which includes a second actuator, a second controller, and a feedforward controller, to form a secondary control loop. Among them, the secondary control loop adjusts the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam based on the preset temperature at the intermediate point. Among them, the mathematical expression of the secondary control loop can be but is not limited to:

[0077]

[0078] Among them, K2 is the steady-state gain, T2 is the time parameter, and τ2 is the delay time.

[0079] It can be understood that in the embodiments of the present application, the second actuator is the spray desuperheating regulating valve G2, and in combination with the second controller Z2 and the feedforward controller D, a secondary control loop is formed.

[0080] In some embodiments, the secondary control loop of the embodiments of the present application can adjust the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam based on the preset temperature of the intermediate point. Wherein, the preset temperature of the superheated steam can be set by those skilled in the art according to the actual situation, and the present application does not make specific limitations.

[0081] Furthermore, the embodiments of the present application can conduct a dynamic response test on the secondary control loop, determine the step response model of the controlled object of the secondary control loop, and determine key parameters including the steady-state gain K2, time parameter T2, delay time τ2, and open-loop regulation time. Among them, the mathematical expression of the controlled object of the secondary control loop can be but is not limited to:

[0082]

[0083] Wherein, K2 is the steady-state gain, T2 is the time parameter, and τ2 is the delay time.

[0084] Furthermore, in the embodiments of the present application, the working principle of controlling the secondary control loop by using the desuperheating regulating valve G2 is as follows: when a large amount of additional undersaturated steam enters the working fluid cycle, the embodiments of the present application can ensure the stability of the main steam parameters. When a load increase instruction arrives and the boiler output increases, the temperature of the superheated steam can be appropriately increased. The desuperheating effect is controlled by the desuperheating regulating valve G2 to adjust the temperature of the superheated steam. The specific relationship is: when the load increase rate Pe is relatively high, a weaker desuperheating effect is required to quickly increase the temperature of the superheated steam; when the load increase rate Pe is relatively low, a stronger desuperheating effect is required to prevent the temperature of the superheated steam from rising too fast. That is, in the embodiments of the present application, the load increase rate Pe acts on the desuperheating regulating valve G2 in the reverse direction.

[0085] Optionally, in an embodiment of the present application, the second controller includes: a second input unit for obtaining the actual temperature of the superheated steam in the boiler; a second calculation unit for calculating the second error between the preset temperature of the superheated steam and the actual temperature of the superheated steam. Among them, the transfer function of the second controller can be but is not limited to:

[0086]

[0087] Wherein, k is the controller proportionality coefficient, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

[0088] In some embodiments, the input of the second controller Z2 of the embodiments of the present application is the second error e2 obtained by subtracting the preset temperature R2 of the superheated steam from the actual temperature Y2 of the superheated steam, and the output is U2. Then, there is

[0089] U2 = Z2(R2 - Y2) = e2Z2。

[0090] Further, in the embodiments of the present application, the transfer function of the second controller may but is not limited to:

[0091]

[0092] where k is the controller proportionality coefficient, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

[0093] In addition, it should be noted that the conversion relationship between the second controller in the embodiments of the present application and the traditional PID controller may but is not limited to:

[0094]

[0095] where T i , K p , T d , K d are respectively the integral time, proportionality coefficient, derivative time, and derivative coefficient of the traditional PID controller.

[0096] Furthermore, the embodiments of the present application can calculate the initial value of T c using the step response model. The PID control module of the DCS control system of the thermal power unit has four parameters to be set, which can be T i , K p , T d , K d respectively, and they can be obtained according to the initial parameter conversion formula of T c and the PID control module. Further, during actual debugging in the embodiments of the present application, the initial value of λ can be selected as 0.1. Gradually increase or decrease λ from the initial value. Each time T c is increased, then gradually adjust the controller gain coefficient λ from half of the value of T c to make the closed-loop control effect meet the performance index, and substitute the parameters λ, α, and T c into the above conversion formula for configuration in the PID control module of the DCS control system.

[0097] Optionally, in an embodiment of the present application, the second actuator includes: a second acquisition unit for acquiring the second target parameter in the secondary control loop; a second adjustment unit for using the second target parameter to adjust the second error according to the second preset step size to adjust the actual temperature of the superheated steam to the preset temperature of the superheated steam.

[0098] In some embodiments, after being weighted by the feedforward controller, D + U2 is the input value of the desuperheating control valve G2. After being adjusted by the desuperheating control valve G2, the temperature of the superheated steam changes, and the temperature of the adjusted superheated steam value obtained through the temperature acquisition module is the output value Y2.

[0099] Among them, in the embodiments of the present application, the initial value of the feedforward controller weighting coefficient can be set to The steam flow control valve G1 is manually controlled, the secondary control loop is put into automatic, and the parameter α is adjusted at a second preset step, such as 0.1, until there is no residual difference between the preset temperature of the superheated steam and the actual temperature of the superheated steam.

[0100] Optionally, in an embodiment of the present application, the expression of the feedforward controller can be but not limited to:

[0101]

[0102] Among them, P e is the unit load increase rate, d0 is the feedforward weighting coefficient, and τ0 is the calculated value of the intermediate point temperature rise.

[0103] It can be understood that in the embodiments of the present application, the working principle of the feedforward controller is as follows: when a large amount of undersaturated steam enters the steam-water separator, it will not be directly reflected in the temperature of the superheated steam, that is, it has a certain delay. At this time, the embodiments of the present application can feedback the change of the intermediate point temperature to the secondary control loop in advance to prevent the situation that the desuperheating control valve G2 cannot make timely adjustments. The specific relationship is: when the intermediate point temperature rises rapidly, a stronger desuperheating effect is required; when the intermediate point temperature rises slowly, a weaker desuperheating effect is required. That is, the rising rate of the intermediate point temperature acts positively on the desuperheating control valve G2.

[0104] Among them, in the embodiments of the present application, the input value of the feedforward controller is the intermediate point temperature Y1, and the output value of the feedforward controller is one of the input values of the second controller Z2. Its expression can be but not limited to:

[0105]

[0106] Among them, P eis the load increase rate of the unit, d0 is the feed-forward weighting coefficient, and τ0 is the calculated value of the intermediate point temperature rise. On the one hand, the influence of the increase in the intermediate point temperature on the superheated steam temperature has a certain delay. On the other hand, to meet the rapid load increase demand of the unit, the load change rate needs to be quickly reflected in the superheated steam temperature control. Setting up a feed-forward controller can well solve the problem that the second controller Z2 has a slow response. According to the formula, the specific relationship can be described as: the intermediate point temperature is positively correlated with the desuperheating water spray effect, and the load change rate is negatively correlated with the desuperheating water spray effect.

[0107] The working principle of the temperature control device for boiler superheated steam proposed in the embodiments of the present application will be introduced below in conjunction with a specific embodiment.

[0108] Among them, Figure 2 is the flowchart of the working principle of the temperature control device for boiler superheated steam provided by an embodiment of the present application.

[0109] Step S201: Construct a primary control loop.

[0110] Among them, in the embodiments of the present application, the primary control loop may but is not limited to including a first actuator, a first controller, a temperature acquisition module, etc., and the present application does not make specific limitations.

[0111] Step S202: Construct a secondary control loop.

[0112] Among them, in the embodiments of the present application, the secondary control loop may but is not limited to including a secondary control loop, etc., and the present application does not make specific limitations.

[0113] Step S203: Obtain the transfer functions of the first controller and the second controller.

[0114] Step S204: Conduct a dynamic response test on the primary control loop and the secondary control loop to determine the initial parameters of the PID control module.

[0115] Step S205: Superheated steam temperature control.

[0116] Among them, in the embodiments of the present application, the second actuator can be set to manual control, the primary control loop is put into automatic, and the first target parameters λ and α are adjusted in steps of 0.1 until the actual temperature at the intermediate point is adjusted to the preset temperature at the intermediate point.

[0117] After that, in the embodiments of the present application, the initial value of the feed-forward controller weighting coefficient can be set, the steam flow regulating valve G1 is set to manual control, the secondary control loop is put into automatic, and the parameter α is adjusted in steps of 0.1 until there is no residual difference between the preset temperature of the superheated steam and the actual temperature of the superheated steam.

[0118] The temperature control device for boiler superheated steam proposed according to the embodiments of the present application can form a primary control loop using a first actuator, a first controller, and a temperature acquisition module, and form a secondary control loop using a second actuator, a second controller, and a feedforward controller. The actual temperature of the intermediate point is collected in real time through the primary control loop, and the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point. The actual temperature of the superheated steam is adjusted to the preset temperature of the superheated steam through the secondary control loop, thereby ensuring the stability and accuracy of the intermediate point temperature, achieving precise control of the superheated steam temperature, enhancing the system stability, improving the response speed and efficiency, and being able to adapt to different working conditions and requirements. Thus, the problems in the related art, such as low control accuracy, slow execution speed, limited flexibility and scalability of the system, and inability to face different working conditions and requirements, are solved.

[0119] Next, a temperature control method for boiler superheated steam proposed according to the embodiments of the present application is described with reference to the accompanying drawings.

[0120] Figure 3 FIG. is a flowchart of the temperature control method for boiler superheated steam provided according to the embodiments of the present application.

[0121] As Figure 3 shown, the temperature control method for the boiler superheated steam includes the following steps:

[0122] In step S301, the actual temperature of the intermediate point in the boiler is collected in real time.

[0123] In step S302, the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point.

[0124] In step S303, based on the preset temperature of the intermediate point, the actual temperature of the superheated steam in the boiler is adjusted to the preset temperature of the superheated steam.

[0125] It should be noted that the foregoing explanation of the embodiments of the temperature control device for boiler superheated steam also applies to the temperature control method for boiler superheated steam in this embodiment, and will not be repeated here.

[0126] According to the temperature control method of the boiler superheated steam proposed in the embodiments of the present application, a primary control loop can be formed by using a first actuator, a first controller, and a temperature acquisition module, and a secondary control loop can be formed by using a second actuator, a second controller, and a feedforward controller. The actual temperature of the intermediate point is collected in real time through the primary control loop, and the actual temperature of the intermediate point is adjusted to the preset temperature of the intermediate point. The actual temperature of the superheated steam is adjusted to the preset temperature of the superheated steam through the secondary control loop, thereby ensuring the stability and accuracy of the intermediate point temperature, achieving precise control of the superheated steam temperature, enhancing the system stability, improving the response speed and efficiency, and being able to adapt to different working conditions and requirements. Thus, the problems in the related art, such as low control accuracy, slow execution speed, limited flexibility and scalability of the system, and inability to face different working conditions and requirements, are solved.

[0127] Figure 4 FIG. is a schematic structural diagram of an electronic device provided according to an embodiment of the present application. The electronic device may include:

[0128] A memory 401, a processor 402, and a computer program stored on the memory 401 and executable on the processor 402.

[0129] When the processor 402 executes the program, it implements the temperature control method of the boiler superheated steam provided in the above embodiments.

[0130] Furthermore, the electronic device further includes:

[0131] A communication interface 403 for communication between the memory 401 and the processor 402.

[0132] The memory 401 is used to store a computer program executable on the processor 402.

[0133] The memory 401 may include a high-speed RAM memory, and may also include a non-volatile memory, such as at least one disk memory.

[0134] If the memory 401, the processor 402, and the communication interface 403 are implemented independently, the communication interface 403, the memory 401, and the processor 402 can be interconnected via a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 only a thick line is used in Figure 4 , but it does not mean that there is only one bus or one type of bus.

[0135] Optionally, in a specific implementation, if the memory 401, the processor 402, and the communication interface 403 are integrated on a single chip, the memory 401, the processor 402, and the communication interface 403 can communicate with each other through an internal interface.

[0136] The processor 402 may be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0137] The embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the temperature control method of the boiler superheated steam as described above is implemented.

[0138] The embodiments of the present application also provide a computer program product, including a computer program, and when the program is executed, the temperature control method of the boiler superheated steam as described above is implemented.

[0139] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or N embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0140] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, the meaning of "N" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0141] Any process or method description shown in a flowchart or described in other ways herein can be understood to represent a module, segment, or portion of code including one or N executable instructions for implementing a customized logic function or process, and the scope of the preferred embodiments of this application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of this application belong.

[0142] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definite sequence list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device), or used in conjunction with these instruction execution systems, apparatus, or devices. For the purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection portion (electronic device) having one or N wirings, a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically by optically scanning the paper or other media, followed by editing, interpretation, or otherwise processing as appropriate, and then stored in a computer memory.

[0143] It should be understood that various parts of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or a combination of the following techniques well-known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application-specific integrated circuits having suitable combinational logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), and the like.

[0144] Those of ordinary skill in the art of this technology can understand that all or part of the steps carried by the method of the above-described embodiments can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0145] In addition, each functional unit in various embodiments of the present application may be integrated into a processing module, may exist physically alone for each unit, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0146] The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A temperature control device for superheated steam in a boiler, characterized in that, Including: A first control device, which includes a first actuator, a first controller, and a temperature acquisition module to form a primary control loop; A second control device, which includes a second actuator, a second controller, and a feedforward controller to form a secondary control loop. Among them, the primary control loop is used to collect the actual temperature of the intermediate point in the boiler in real time and adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point. The secondary control loop adjusts the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam based on the preset temperature of the intermediate point.

2. The device according to claim 1, characterized in that, The first controller includes: A first input unit for obtaining the actual temperature of the intermediate point of the boiler; A first calculation unit for calculating the first error between the preset temperature of the intermediate point and the actual temperature of the intermediate point.

3. The device according to claim 2, characterized in that, The first actuator includes: A first acquisition unit for obtaining the first target parameter in the primary control loop; A first adjustment unit for adjusting the first error according to the first preset step size by using the first target parameter to adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point.

4. The device according to claim 1, characterized in that The second controller includes: A second input unit for obtaining the actual temperature of the superheated steam in the boiler; A second calculation unit for calculating the second error between the preset temperature of the superheated steam and the actual temperature of the superheated steam.

5. The device according to claim 4, characterized in that, The second actuator includes: A second acquisition unit for obtaining the second target parameter in the secondary control loop; A second adjustment unit for adjusting the second error according to the second preset step size by using the second target parameter to adjust the actual temperature of the superheated steam to the preset temperature of the superheated steam.

6. The device according to claim 1, characterized in that, The transfer functions of the first controller and the second controller are: where k is the proportional coefficient of the controller, α is the damping ratio, T c is the bandwidth of the active disturbance rejection controller, and T0 is the bandwidth of the error feedback control rate.

7. The device according to claim 1, wherein The expression of the feedforward controller is: where P e is the unit load increase rate, d0 is the feedforward weighting coefficient, and τ0 is the calculated value of the intermediate point temperature rise.

8. The device according to claim 1, characterized in that, Wherein, The mathematical expression of the primary control loop is: Wherein, K1 is the steady-state gain, T1 is the time parameter, and τ1 is the delay time; The mathematical expression of the secondary control loop is: Wherein, K2 is the steady-state gain, T2 is the time parameter, and τ2 is the delay time.

9. A method for controlling the temperature of superheated steam in a boiler, characterized in that, Including the following steps: Collect the actual temperature of the intermediate point in the boiler in real time; Adjust the actual temperature of the intermediate point to the preset temperature of the intermediate point; Based on the preset temperature of the intermediate point, adjust the actual temperature of the superheated steam in the boiler to the preset temperature of the superheated steam.

10. An electronic device, characterized in that, Including: A memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to implement the temperature control method for the superheated steam of the boiler as described in any one of claims 9.

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