A Method and System for Automatic Control of Reheater Flue Gas Damper Based on Predictive Control

Abstract

The present invention discloses a method and system for automatically controlling a reheater flue gas damper based on predictive control. The method of the present invention includes determining the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper; predicting the reheater steam temperature T at the moment of t1 re2 ; if T re2 is greater than the automatic control virtual set value T sp2 , then close the reheater flue gas damper, otherwise open the reheater flue gas damper; where T sp2 is obtained by dynamically correcting the reheater steam temperature set according to the automatic control of the flue gas damper, and the correction value is negatively correlated with the change rate of the reheater steam temperature and the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater. The purpose of the present invention is to realize the automatic control of the reheater flue gas damper by predicting the reheater steam temperature, and effectively improve the automatic control quality of the flue gas damper by combining the dynamic correction of the automatic control virtual set value, realize the high-precision control and adjustment of the reheater steam temperature, and improve the safety and economy of the unit.

Description

Technical Field

[0001] The present invention relates to the field of control engineering of thermal power generating units, and particularly to an automatic control method and system for reheater flue gas dampers based on predictive control. Background Art

[0002] At present, the reheating system of a thermal power unit boiler mainly relies on convective heat transfer. The adjustment method usually involves adjusting the reheater flue gas damper for control, with accident spray desuperheating as an auxiliary adjustment means. During the operation of the boiler, changes in unit load, ash fouling of the heating surface, fuel characteristics, and air distribution mode will all have a significant impact on the reheated steam temperature. The input of reheater desuperheating water increases the coal consumption of the unit, and if the reheated steam temperature exceeds the limit, it is likely to increase the risk of tube rupture in the reheater heating surface. Therefore, maintaining the stability of the reheated steam temperature and reducing the input of reheater desuperheating water are crucial for the safe and economic operation of thermal power generating units.

[0003] Currently, the control of reheated steam temperature in domestic large-scale thermal power generating units generally adopts a conventional single-loop PID control system. Taking the steam temperature at the outlet of the reheater as the control object, the opening of the reheater flue gas damper is directly controlled, and the flue gas damper on the superheater side changes in a follow-up and reverse manner. However, the adjustment of the flue gas damper has a large lag and nonlinearity, resulting in poor control quality of the reheated steam temperature, large fluctuations in the steam temperature, and often requiring manual intervention by operators. On the one hand, this increases the workload of the operators, and on the other hand, due to untimely adjustment, a large amount of desuperheating water often needs to be sprayed, reducing the economic efficiency of the unit operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: In view of the above problems of the prior art, to provide an automatic control method and system for reheater flue gas dampers based on predictive control, the present invention aims to improve the automatic control quality of the flue gas damper, achieve high-precision control and adjustment of the reheated steam temperature, and enhance the safety and economic efficiency of the unit.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] An automatic control method for reheater flue gas dampers based on predictive control, comprising:

[0007] S101, determining the delay time t1 of the change in the reheated steam temperature of the boiler with respect to the change in the reheater flue gas damper;

[0008] S102, predicting the reheated steam temperature T at time t1 based on the current reheated steam temperature and its change rate re2 ;

[0009] S103, judging whether the reheated steam temperature T after time t1 re2 is greater than the automatic control virtual set value T sp2Whether it holds. If it holds, close the flue gas damper of the reheater; otherwise, open the flue gas damper of the reheater. Among them, the automatic control virtual set value T sp2 is the reheater steam temperature T set according to the automatic control of the flue gas damper sp1 is obtained by dynamic correction, and the dynamic correction value is negatively correlated with the change rate of the reheater steam temperature and the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater

[0010] Optionally, when determining the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper in step S101, it includes measuring the delay time of the reheater steam temperature with respect to the change of the reheater flue gas damper for more than 3 steady-state operating conditions with different loads of the boiler respectively, and taking the average value of the obtained delay times under the steady-state operating conditions with different loads as the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper

[0011] Optionally, predicting the reheater steam temperature T at the moment t1 in step S102 re2 The function expression is:

[0012] T re2 = T re1 + dT re1 / dt * t1

[0013] In the above formula, T re1 is the reheater steam temperature at the current moment, dT re1 / dt is the change rate of the reheater steam temperature, and t1 is the delay time of the reheater steam temperature with respect to the change of the reheater flue gas damper

[0014] Optionally, the correction function expression of the automatic control virtual set value T in step S103 sp2 is:

[0015] T sp2 = T sp1 + δ

[0016] In the above formula, T sp1 is the reheater steam temperature set by the automatic control of the flue gas damper, and δ is the dynamic correction value

[0017] Optionally, after step S103, it further includes: dynamically adjusting the new dynamic correction value δ according to δ = k1K + k2 * dT re1 / dt, and then limiting the new dynamic correction value δ, where k1 and k2 are correlation coefficients, and both k1 and k2 are negative values, K is the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater, and dT re1 / dt is the change rate of the reheater steam temperature

[0018] Optionally, after step S103, it further includes:

[0019] S104, wait for the preset interval time Δt;

[0020] S105, determine whether the reheat steam temperature at the current moment and the change rate of the reheat steam temperature at the current moment meet the termination condition. If the termination condition is not met, jump to step S102 to continue automatic adjustment; otherwise, jump to step S104.

[0021] Optionally, the functional expression of the termination condition in step S105 is:

[0022] T sp1 -ΔT < T re1 < T sp1 + ΔT and |dT re1 / dt| < V T

[0023] In the above formula, T sp1 is the reheat steam temperature set for the automatic control of the flue gas damper, T re1 is the reheat steam temperature at the current moment, |dT re1 / dt| is the absolute value of the change rate of the reheat steam temperature at the current moment, ΔT is the automatic control dead zone threshold of the reheat steam temperature, and V T is the automatic control dead zone threshold of the change rate of the reheat steam temperature.

[0024] Optionally, in step S104, the preset interval time Δt ≤ 5s, the automatic control dead zone threshold ΔT of the reheat steam temperature ≤ 3°C, and the automatic control dead zone threshold V of the change rate of the reheat steam temperature T ≤ 0.5°C / min.

[0025] In addition, the present invention also provides a reheat flue gas damper automatic control system based on predictive control, including a microprocessor and a memory connected to each other, and the microprocessor is programmed or configured to execute the reheat flue gas damper automatic control method based on predictive control.

[0026] In addition, the present invention also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is used to be programmed or configured by a microprocessor to execute the reheat flue gas damper automatic control method based on predictive control.

[0027] Compared with the prior art, the present invention mainly has the following advantages: The method of the present invention includes determining the delay time t1 of the reheat steam temperature of the boiler with respect to the change of the reheat flue gas damper; predicting the reheat steam temperature T re2 at time t1 according to the reheat steam temperature at the current moment and its change rate; judging that the reheat steam temperature T re2 after time t1 is greater than the automatic control virtual set value T sp2Whether it holds. If it holds, close the reheater flue gas damper slightly; otherwise, open the reheater flue gas damper. Predict the reheater steam temperature T at time t1 re2 to achieve automatic control of the reheater flue gas damper to adjust the flue gas damper in advance, and through the automatic control of the virtual set value T sp2 The reheater steam temperature T is set according to the automatic control of the flue gas damper sp1 is obtained by dynamic correction, and the dynamic correction value is negatively correlated with the change rate of the reheater steam temperature and the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater. It can avoid the back-and-forth fluctuation of the steam temperature, overcome the problem of poor regulation quality caused by the lag of the flue gas damper and the sudden change of the operating conditions resulting in the sharp change of the reheater steam temperature, effectively improve the automatic control quality of the flue gas damper, achieve accurate prediction and fine control of the reheater steam temperature, and enhance the safety and economy of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic flow chart of the method in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention can be implemented in many different ways defined and covered by the claims.

[0030] Embodiment 1:

[0031] Refer to Figure 1 , the automatic control method of the reheater flue gas damper based on predictive control in this embodiment includes:

[0032] S101. Determine the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper;

[0033] S102. Predict the reheater steam temperature T at time t1 according to the current reheater steam temperature and its change rate re2 ;

[0034] S103. Judge whether the reheater steam temperature T after time t1 re2 is greater than the automatic control virtual set value T sp2 . If it holds, close the reheater flue gas damper slightly; otherwise, open the reheater flue gas damper. The automatic control virtual set value T sp2 is obtained by dynamic correction according to the reheater steam temperature T sp1 set for the automatic control of the flue gas damper, and the dynamic correction value is negatively correlated with the change rate of the reheater steam temperature and the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater.

[0035] The automatic control method of the reheater flue gas damper based on predictive control in this embodiment predicts the reheater steam temperature T at time t1 re2To achieve the automatic control of the reheater flue gas damper, it can effectively improve the automatic control quality of the flue gas damper, achieve high-precision control and adjustment of the reheater steam temperature, and enhance the safety and economy of the unit.

[0036] In order to improve the detection accuracy of the delay time t1 of the reheater steam temperature in the boiler with respect to the change of the reheater flue gas damper, when determining the delay time t1 of the reheater steam temperature in the boiler with respect to the change of the reheater flue gas damper in step S101 of this embodiment, it includes measuring the delay time of the reheater steam temperature with respect to the change of the reheater flue gas damper under steady-state conditions of more than 3 different loads for the boiler respectively, and taking the average value of the obtained delay times under steady-state conditions of different loads as the delay time t1 of the reheater steam temperature in the boiler with respect to the change of the reheater flue gas damper to ensure the accuracy of the delay time t1. The larger the delay time t1, the slower the dynamic response characteristics of the flue gas damper. In this embodiment, the average delay time t1 of a certain 1000MW supercritical opposed fired boiler is 10min.

[0037] In this embodiment, in step S102, the reheater steam temperature T at time t1 is predicted re2 The function expression is:

[0038] T re2 = T re1 + dT re1 / dt * t1

[0039] In the above formula, T re1 is the reheater steam temperature at the current moment, dT re1 / dt is the change rate of the reheater steam temperature, and t1 is the delay time of the reheater steam temperature with respect to the change of the reheater flue gas damper.

[0040] In this embodiment, the automatic control virtual set value T sp2 is the reheater steam temperature T set according to the automatic control of the flue gas damper. Specifically, it means adding the dynamic correction value to the reheater steam temperature T set by the automatic control of the flue gas damper as the automatic control virtual set value T sp1 . Specifically, in step S103, the correction function expression of the automatic control virtual set value T sp1 is: sp2 . Specifically, in step S103, the correction function expression of the automatic control virtual set value T sp2 is:

[0041] T sp2 = T sp1 + δ

[0042] In the above formula, T sp1 is the reheater steam temperature set by the automatic control of the flue gas damper, and δ is the dynamic correction value.

[0043] In order to prevent overshoot from causing the steam temperature to fluctuate back and forth and accurately control the reheated steam temperature, in this embodiment, the dynamic correction value δ is dynamically variable. The dynamic correction value δ is negatively correlated with the sum K of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater and the change rate dT re1 / dt of the reheated steam temperature. Based on the above technical inspiration, those skilled in the art can adopt the required negative correlation function expression as needed. For example, as an optional implementation manner, after step S103 of this embodiment, it further includes: according to δ = k1K + k2*dT re1 / dt, dynamically adjust the new dynamic correction value δ, and then limit the new dynamic correction value δ, where k1 and k2 are correlation coefficients, and both k1 and k2 are negative values (so it is negatively correlated), K is the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater, and dT re1 / dt is the change rate of the reheated steam temperature. Through the above method, the accuracy of the automatic control virtual set value T sp2 can be improved.

[0044] It should be noted that when limiting the new dynamic correction value δ, the value range can be set according to actual needs. For example, in this embodiment, the value range of the dynamic correction value δ is limited to: -15°C ≤ δ ≤ 15°C. If the new correction value δ exceeds 15°C, it takes the value of 15°C. If the new dynamic correction value δ is lower than -15°C, it takes the value of -15°C, so as to limit the new dynamic correction value δ within -15°C ≤ δ ≤ 15°C. In addition, the value range of the correlation coefficient k1 is: -12 ≤ k1 ≤ -8, and the value range of the correlation coefficient k2 is: -1 ≤ k2 ≤ -5. For example, when the sum K of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater is 10%, and the change rate dT re1 / dt of the reheated steam temperature is 1.5°C / min, set the correlation coefficient k1 = -10 and the correlation coefficient k2 = -4, then the dynamic correction value δ of the virtual set value of the reheated steam temperature = -10 * 10% - 4 * 1.5 = -7°C. If T sp1 = 600°C, then the virtual set value T sp1 is 593°C. When the current reheated steam temperature is lower than the set value of 600°C and is rising rapidly, when the predicted reheated steam temperature T re2 reaches or even exceeds 593°C, the flue gas damper will be closed in advance to achieve early adjustment, prevent overshoot from causing the steam temperature to fluctuate back and forth, and achieve the purpose of accurately controlling the reheated steam temperature.

[0045] See Figure 1 , after step S103 of this embodiment, it further includes:

[0046] S104, wait for a preset interval time Δt;

[0047] S105. Determine whether the reheat steam temperature at the current moment and the change rate of the reheat steam temperature at the current moment meet the termination condition. If the termination condition is not met, jump to step S102 to continue automatic adjustment; otherwise, jump to step S104.

[0048] In step S105 of this embodiment, the functional expression of the termination condition is:

[0049] T sp1 -ΔT < T re1 < T sp1 + ΔT and |dT re1 / dt| < V T

[0050] In the above formula, T sp1 is the reheat steam temperature set for the automatic control of the flue gas damper, T re1 is the reheat steam temperature at the current moment, |dT re1 / dt| is the absolute value of the change rate of the reheat steam temperature at the current moment, ΔT is the automatic control dead zone threshold of the reheat steam temperature (representing the minimum deviation for causing the flue gas damper to act), and V T is the automatic control dead zone threshold of the change rate of the reheat steam temperature (representing the minimum deviation for causing the flue gas damper to act).

[0051] In this embodiment, the preset interval time Δt ≤ 5 s in step S104, the automatic control dead zone threshold ΔT of the reheat steam temperature ≤ 3 °C, and the automatic control dead zone threshold V T of the change rate of the reheat steam temperature ≤ 0.5 °C / min. For example, in this embodiment, the steam temperature dead zone ΔT is set to 2 °C, T sp1 = 600 °C, and the dead zone V T of the change rate of the reheat steam temperature = 0.3 °C / min. Then, when the reheat steam temperature is in the range of 598 °C ≤ T re1 ≤ 602 °C, and the change rate of the reheat steam temperature |dT re1 / dt| ≤ 0.3 °C / min, it indicates that the reheat steam temperature is stable within the set target value range, and the flue gas damper will suspend operation. At this time, the damper opening is the target opening under the stable operating condition.

[0052] In summary, the automatic control method for the reheater flue gas damper based on predictive control in this embodiment first calculates the delay time of the reheat steam temperature with respect to the flue gas damper, intelligently predicts the reheat steam temperature after the delay time, and adjusts the flue gas damper opening by comparing the predicted reheat steam temperature with the virtual set value, which can effectively improve the automatic control quality of the flue gas damper. Further, the automatic control virtual set value T sp2Dynamic correction is carried out through the opening of the attemperating water for the reheater and the change rate of the reheater steam temperature, and the gas baffle is adjusted in advance, avoiding the back-and-forth fluctuation of the steam temperature, overcoming the problems of poor regulation quality caused by the lag of the gas baffle and the sudden change of the operating conditions resulting in the sharp change of the reheater steam temperature, realizing the accurate prediction and precise control of the reheater steam temperature, and improving the safety and economy of the unit operation.

[0053] In addition, this embodiment also provides an automatic control system for the gas baffle of the reheater based on predictive control, including a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the automatic control method for the gas baffle of the reheater based on predictive control. In addition, this embodiment also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be programmed or configured by the microprocessor to execute the automatic control method for the gas baffle of the reheater based on predictive control.

[0054] Embodiment 2:

[0055] This embodiment is basically the same as Embodiment 1, and the main difference is that considering the correlation between the sum of the opening degrees of the attemperating water valves on the left and right sides of the reheater and the total attemperating water volume of the reheater, the automatic control virtual set value T sp2 in this embodiment is dynamically corrected according to the reheater steam temperature T sp1 set by the automatic control of the gas baffle, and the dynamic correction value is negatively correlated with the change rate of the reheater steam temperature and the total attemperating water volume of the reheater. Similarly, it can also achieve the purpose of dynamically correcting the automatic control virtual set value T sp2 through the opening of the attemperating water valves for the reheater and the change rate of the reheater steam temperature, adjusting the gas baffle in advance, avoiding the back-and-forth fluctuation of the steam temperature, overcoming the problems of poor regulation quality caused by the lag of the gas baffle and the sudden change of the operating conditions resulting in the sharp change of the reheater steam temperature, and realizing the accurate prediction and precise control of the reheater steam temperature, and improving the safety and economy of the unit operation. Specifically, after step S103 of this embodiment, a new dynamic correction value δ is dynamically adjusted according to δ = k1K + k2*dT re1 / dt. When limiting the new dynamic correction value δ, K is the total attemperating water volume of the reheater, and the value range of k1 is: -0.2 < k1 < -0.05.

[0056] In addition, this embodiment also provides a reheater flue gas damper automatic control system based on predictive control, including a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the reheater flue gas damper automatic control method based on predictive control. In addition, this embodiment also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be programmed or configured by a microprocessor to execute the reheater flue gas damper automatic control method based on predictive control.

[0057] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) containing computer-usable program code. The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 a block or multiple blocks. These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device realizes the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 a block or multiple blocks. These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 a block or multiple blocks.

[0058] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. An automatic control method for reheater flue gas damper based on predictive control, characterized in that, Including: S101, determining the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper; S102, predict the reheat steam temperature T at time t1 according to the reheat steam temperature at the current moment and its rate of change re2 ; S103, determine the reheater steam temperature T after time t1 re2 is greater than the automatic control virtual set value T sp2 If it holds, close the reheater flue gas damper; otherwise, open the reheater flue gas damper. The automatic control virtual set value T sp2 is obtained by dynamically correcting according to the reheater steam temperature T set by the automatic control of the flue gas damper sp1 and the dynamic correction value is negatively correlated with the change rate of the reheater steam temperature and the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater.

2. The automatic control method for the reheater flue gas damper based on predictive control according to claim 1, characterized in that When determining the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper in step S101, it includes measuring the delay time of the reheater steam temperature with respect to the change of the reheater flue gas damper for more than 3 different load steady-state conditions of the boiler respectively, and taking the average value of the obtained delay times under different load steady-state conditions as the delay time t1 of the reheater steam temperature of the boiler with respect to the change of the reheater flue gas damper.

3. The automatic control method for the reheater flue gas damper based on predictive control according to claim 2, characterized in that Predict the reheat steam temperature T at time t1 in step S102 re2 The functional expression of which is: T re2 = T re1 + dT re1 / dt* t1 In the above formula, T re1 is the reheat steam temperature at the current moment, dT re1 / dt is the change rate of the reheat steam temperature, and t1 is the delay time of the reheat steam temperature with respect to the change of the reheat flue gas damper.

4. The automatic control method for the reheater flue gas damper based on predictive control according to claim 3, wherein The correction function expression of the automatically controlled virtual set value T in step S103 sp2 is as follows: T sp2 = T sp1 + δ In the above formula, T sp1 is the reheater steam temperature set for the automatic control of the flue gas damper, and δ is the dynamic correction value.

5. The automatic control method for the reheater flue gas damper based on predictive control according to claim 4, characterized in that, After step S103, it further includes: dynamically adjusting a new dynamic correction value δ according to δ = k1K + k2*dT re1 / dt, and then limiting the new dynamic correction value δ, where k1 and k2 are correlation coefficients, and both k1 and k2 are negative values, K is the sum of the opening degrees of the desuperheating water regulating valves on the left and right sides of the reheater or the total desuperheating water volume of the reheater, and dT re1 / dt is the change rate of the reheater steam temperature.

6. The automatic control method for the reheater flue gas damper based on predictive control according to any one of claims 1 to 5, characterized in that After step S103, it further includes: S104, waiting for a preset interval time Δt; S105, judging whether the reheater steam temperature at the current moment and the change rate of the reheater steam temperature at the current moment meet the termination condition. If the termination condition is not met, jump to step S102 to continue automatic adjustment; otherwise, jump to step S104.

7. The automatic control method of the reheater flue gas damper based on predictive control according to claim 6, characterized in that, The functional expression of the termination condition in step S105 is: T sp1 -ΔT < T re1 < T sp1 + ΔT and |dT re1 / dt| < V T In the above formula, T sp1 is the reheat steam temperature set for the automatic control of the flue gas damper, T re1 is the reheat steam temperature at the current moment, |dT re1 / dt| is the absolute value of the change rate of the reheat steam temperature at the current moment, ΔT is the automatic control dead zone threshold of the reheat steam temperature, V T is the automatic control dead zone threshold of the change rate of the reheat steam temperature.

8. The automatic control method for the reheater flue gas damper based on predictive control according to claim 7, characterized in that In step S104, the preset interval time Δt ≤ 5 s, the automatic control dead zone threshold ΔT of the reheated steam temperature ≤ 3 °C, and the automatic control dead zone threshold V of the change rate of the reheated steam temperature T ≤ 0.5 °C / min.

9. A reheater flue gas damper automatic control system based on predictive control, comprising a microprocessor and a memory connected to each other, characterized in that, The microprocessor is programmed or configured to execute the automatic control method of the reheater flue gas damper based on predictive control described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program therein, characterized in that, The computer program is used to be programmed or configured by the microprocessor to execute the automatic control method of the reheater flue gas damper based on predictive control described in any one of claims 1 to 8.

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