Operation control method, device, equipment, medium and program product of thermal power generating unit

Abstract

The application relates to the technical field of thermal power unit control of a power system, in particular to a thermal power unit operation control method, device, equipment, medium and program product, wherein the method comprises the following steps: monitoring the operation condition of a thermal power unit; when the operation condition is a primary air fan RB operation condition, obtaining the current load and current operation data of the thermal power unit, wherein the operation data comprises at least one of the operation state of a coal mill in the thermal power unit, the opening degree of a target feed water pump adjusting valve and feed water flow; based on the current load, the operation of an induced draft fan in the thermal power unit is controlled to stabilize the furnace pressure of the thermal power unit; based on the operation state of the coal mill, the coal mill is stopped according to a preset coal mill stop sequence, and based on the opening degree of the target feed water pump adjusting valve and the feed water flow, the opening degree of the target feed water pump adjusting valve is superordinated. Therefore, the problems that in the related art, it is difficult to guarantee the safe and stable operation of the thermal power unit under the RB operation condition are solved.

Description

Technical Field

[0001] This application relates to the field of thermal power unit control technology in power systems, and particularly to a method, device, equipment, medium and program product for the operation control of thermal power units. Background Technology

[0002] In actual operation of thermal power units, the primary air fan RB (Runback, representing rapid load reduction due to auxiliary machine failure) condition is quite common. It is mostly caused by a sudden drop in air volume due to primary air fan failure or protection action, which poses a significant challenge to boiler combustion stability, furnace pressure control, fuel quantity matching, and safe operation of the feedwater system.

[0003] In related technologies, after the primary air blower experiences RB operating conditions, the furnace pressure is usually adjusted using a feedback loop with fixed parameters. The coal mill is shut down at fixed time intervals, and the minimum flow valve of the feedwater pump is adjusted in a conventional manner. This can easily lead to problems such as slow furnace pressure response, large fluctuations, air-coal mismatch, and fluctuations in feedwater flow and pressure, making it difficult to ensure the safe and stable operation of the unit under RB operating conditions. Summary of the Invention

[0004] This application provides a method, device, equipment, medium, and program product for the operation control of thermal power units, in order to solve the problems in related technologies that make it difficult to ensure the safe and stable operation of thermal power units under RB conditions.

[0005] The first aspect of this application provides an operation control method for a thermal power unit, comprising the following steps: monitoring the operating conditions of the thermal power unit; when the operating condition is the primary air fan RB condition, acquiring the current load and current operating data of the thermal power unit, wherein the operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate; controlling the operation of the induced draft fan in the thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit; shutting down the coal mill according to a preset coal mill shutdown sequence based on the coal mill operating status, and controlling the opening degree of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override.

[0006] Optionally, controlling the operation of the induced draft fan in the thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit includes: determining the corresponding induced draft feedforward command based on the current load; acquiring the induced draft fan command of the thermal power unit; superimposing the induced draft feedforward command and the induced draft fan command, and controlling the operation of the induced draft fan in the thermal power unit based on the superimposed command to adjust the furnace pressure.

[0007] Optionally, before superimposing the induced draft feedforward command and the induced draft fan command, the following steps are included: obtaining the number of induced draft fans operating in the thermal power unit; if the number of operating fans is the target number, then modifying the induced draft feedforward command.

[0008] Optionally, after controlling the operation of the induced draft fan in the thermal power unit based on the superimposed command, the method further includes: if the primary fan RB condition is restored, setting the induced draft feedforward command as the target induced draft feedforward command and setting a speed limit for the induced draft feedforward command.

[0009] Optionally, the coal mills are shut down according to a preset shutdown sequence based on their operating status, including: determining the operating coal mills based on their operating status; sorting the operating coal mills according to the preset shutdown sequence, directly shutting down the coal mill ranked first, and shutting down the other coal mills in sequence at preset shutdown time intervals, wherein the preset shutdown time interval is less than the shutdown time interval for other types of RB operating conditions except for the primary air fan RB operating condition.

[0010] Optionally, the override control of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate includes: obtaining the reference feedwater flow rate of the thermal power unit; if the opening degree of the target feedwater pump regulating valve is less than the preset opening degree and the feedwater flow rate is less than the reference feedwater flow rate within a preset proportional range, then the override control thermal power unit adjusts the opening degree of the target feedwater pump regulating valve to the preset opening degree.

[0011] A second aspect of this application provides an operation control device for a thermal power unit, comprising: a monitoring module for monitoring the operating conditions of the thermal power unit; an acquisition module for acquiring the current load and current operating data of the thermal power unit when the operating condition is the primary air fan RB condition, wherein the operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate; a first control module for controlling the operation of the induced draft fan in the thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit; and a second control module for shutting down the coal mill according to a preset coal mill shutdown sequence based on the coal mill operating status, and controlling the opening degree of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override.

[0012] Optionally, the first control module is further configured to: determine the corresponding induced draft feedforward command based on the current load; acquire the induced draft fan command of the induced draft fan in the thermal power unit; superimpose the induced draft feedforward command and the induced draft fan command, and control the operation of the induced draft fan in the thermal power unit based on the superimposed command to adjust the furnace pressure.

[0013] Optionally, it also includes: a correction module, used to obtain the number of induced draft fans in the thermal power unit before superimposing the induced draft feedforward command and the induced draft fan command; if the number of fans is the target number, then the induced draft feedforward command is corrected.

[0014] Optionally, it also includes: a setting module, which, after controlling the operation of the induced draft fan in the thermal power unit based on the superimposed command, sets the induced draft feedforward command as the target induced draft feedforward command and sets a speed limit for the induced draft feedforward command if the primary fan RB condition is restored.

[0015] Optionally, the second control module is further configured to: determine the operating coal mills based on their operating status; sort the operating coal mills according to a preset coal mill shutdown order, directly shut down the coal mill ranked first, and shut down the other coal mills in sequence at preset shutdown time intervals, wherein the preset shutdown time interval is less than the shutdown time interval for coal mills under other types of RB operating conditions except for the primary air fan RB operating condition.

[0016] Optionally, the second control module is further configured to: obtain the reference feedwater flow rate of the thermal power unit; if the opening degree of the target feedwater pump regulating valve is less than the preset opening degree and the feedwater flow rate is less than the reference feedwater flow rate within the preset proportional range, then the override control thermal power unit adjusts the opening degree of the target feedwater pump regulating valve to the preset opening degree.

[0017] A third aspect of this application provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. The processor executes the program to perform the operation control method for a thermal power unit as described in the above embodiments.

[0018] The fourth aspect of this application provides a computer-readable storage medium having a computer program or instructions stored thereon, which is executed by a processor to perform the operation control method for a thermal power unit as described in the above embodiments.

[0019] The fifth aspect of this application provides a computer program product, including a computer program or instructions, which, when executed, implement the operation control method for a thermal power unit as described in the above embodiments.

[0020] Therefore, this application has at least the following beneficial effects: This application embodiment can control the operation of a thermal power unit based on its current load and operating data when the primary air fan is in RB mode. Specifically, it rapidly stabilizes the furnace pressure by adjusting the operation of the induced draft fan based on the unit load, controls the coal consumption and timely matches the air volume by combining the coal mill shutdown sequence, and achieves overrun safety protection of the feedwater pump regulating valve through dual-condition judgment. This makes the control more targeted, reduces the impact of the primary air fan RB mode on furnace pressure, fuel consumption control, and the feedwater system, and achieves coordinated control of furnace pressure, coal mill, and feedwater pump regulating valve, significantly improving the operational stability and safety of the thermal power unit under the primary air fan RB mode. Therefore, it solves the technical problems in related technologies that make it difficult to ensure the safe and stable operation of thermal power units under RB mode.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of the operation control method for a thermal power unit provided according to an embodiment of this application; Figure 2 This is an example diagram of an operation control device for a thermal power unit provided according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of this application. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 intended to explain this application, and should not be construed as limiting this application.

[0024] In existing thermal power plant operations, the primary air fan RB (Reduced Air Flow) condition is a common operating state. It typically occurs when the primary air fan automatically reduces its airflow due to a fault or control system protection activation. The primary air fan RB condition poses significant challenges to boiler combustion stability, furnace pressure control, fuel quantity regulation, and the normal operation of the feedwater system.

[0025] Once the primary blower RB is triggered, the control strategies for the circuits such as furnace pressure control, fuel control, and feedwater flow control are crucial to ensure stable operation of the unit. Improper control can easily lead to unstable operation of the unit, reduced efficiency, or even equipment damage.

[0026] However, the control methods in the relevant technologies have the following shortcomings: First, after the primary air blower RB is activated, the adjustment of the induced draft feedforward command is usually not adaptive, which may lead to large fluctuations in furnace pressure and affect combustion stability. Second, after any RB is activated, the time interval for the pulverizer trips is often fixed, without distinguishing the pulverizer trip times of the primary air blower RB from other types of RBs. This may result in untimely fuel quantity control when the primary air blower RB is activated, thus affecting the stability of furnace temperature and steam parameters. Finally, after the primary air blower RB is activated, the minimum flow control valve of the feedwater pump lacks optimization, which may cause fluctuations in the flow and pressure of the feedwater system, affecting the quality of feedwater regulation.

[0027] To this end, this application provides an operation control method for thermal power units, which optimizes the feedforward command for induced draft after the primary air fan RB action, improving the response speed and accuracy of furnace pressure control; optimizes the time interval for stopping the coal mill after the primary air fan RB action is triggered, enabling it to adaptively adjust according to the unit load and operating status, improving the timeliness and accuracy of fuel quantity control; in addition, it also involves the optimization of the minimum flow control valve of the feedwater pump after the primary air fan RB override action, so as to ensure the stable operation of the feedwater system.

[0028] Specifically, Figure 1 This is a flowchart illustrating an operation control method for a thermal power unit provided in an embodiment of this application.

[0029] like Figure 1 As shown, the operation control method of this thermal power unit includes the following steps: In step S101, the operating conditions of the thermal power unit are monitored.

[0030] The operating conditions include the thermal power unit being in normal operation, the primary air fan RB, and other fault conditions.

[0031] In step S102, when the operating condition is the primary air blower RB condition, the current load and current operating data of the thermal power unit are acquired. The operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate.

[0032] Among them, the primary air fan RB condition refers to the tripping of a single primary air fan in a thermal power unit, and the unit enters a state of rapid load reduction due to auxiliary equipment failure; the current load is the current active power of the thermal power unit; the target feedwater pump regulating valve can be the feedwater pump minimum flow recirculation regulating valve.

[0033] It is understood that the embodiments of this application can obtain the current load and current operating data of the thermal power unit when the operating condition of the thermal power unit is the primary air fan RB condition, so as to facilitate subsequent control of the thermal power unit.

[0034] In step S103, the operation of the induced draft fan in the thermal power unit is adjusted based on the current load to stabilize the furnace pressure of the thermal power unit.

[0035] Among them, the induced draft fan is a fan used to regulate the negative pressure and pressure of the furnace.

[0036] It is understood that the embodiments of this application can adjust the operation of the induced draft fan in the thermal power unit based on the current load to quickly stabilize the furnace pressure and avoid large fluctuations in the furnace pressure.

[0037] In step S104, the coal mill is shut down according to the preset coal mill shutdown sequence based on the coal mill operating status, and the opening of the target feedwater pump regulating valve is adjusted based on the opening of the target feedwater pump regulating valve and the feedwater flow rate overshoot.

[0038] Among them, the preset coal mill shutdown sequence and the pre-configured coal mill shutdown priority can be generated by combining the combustion characteristics of thermal power units and the coal mill load distribution. By sorting according to this order, fuel can be reduced rapidly while avoiding uneven combustion in the furnace caused by disorderly shutdown of coal mills, and preventing local combustion deterioration. Override adjustment is superior to conventional control and forcibly controls the opening of valves.

[0039] It is understood that the embodiments of this application can shut down the coal mill according to the preset coal mill shutdown sequence based on the coal mill's operating status, so as to orderly and quickly cut off the fuel, adapt to the situation of sudden drop in air volume, and adjust the opening of the target feedwater pump regulating valve based on the opening of the target feedwater pump regulating valve and the feedwater flow overshoot, so as to provide forced safety protection for the feedwater system and prevent the feedwater pump from tripping.

[0040] This application embodiment can control the operation of a thermal power unit based on the current load and current operating data when the unit is operating under the primary air fan RB condition. Specifically, it quickly stabilizes the furnace pressure by adjusting the operation of the induced draft fan based on the unit load, controls the coal consumption and timely matches the air volume by combining the coal mill shutdown sequence, and achieves override safety protection of the feedwater pump regulating valve through dual-condition judgment. The control is more targeted, reduces the impact of the primary air fan RB condition on furnace pressure, fuel consumption control and feedwater system, and realizes coordinated control of furnace pressure, coal mill and feedwater pump regulating valve, significantly improving the operational stability and safety of the thermal power unit under the primary air fan RB condition.

[0041] In one embodiment of this application, controlling the operation of the induced draft fan in a thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit includes: determining the corresponding induced draft feedforward command based on the current load; acquiring the induced draft fan command of the induced draft fan in the thermal power unit; superimposing the induced draft feedforward command and the induced draft fan command; and controlling the operation of the induced draft fan in the thermal power unit based on the superimposed command to adjust the furnace pressure.

[0042] Among them, the induced draft feedforward command is a rapid adjustment amount of the induced draft fan given in advance according to the load, which is used to suppress disturbances in advance; the induced draft fan command is the original PID regulation output of the induced draft fan.

[0043] It is understood that the embodiments of this application can determine the corresponding induced draft fan feedforward command based on the current load, and superimpose the induced draft fan feedforward command with the original induced draft fan command. Based on the superimposed command, the induced draft fan is controlled to operate, thereby providing an adjustment amount in advance based on the current load before the furnace pressure fluctuates significantly, improving the adjustment response speed of the furnace pressure, suppressing the large pressure fluctuations caused by RB in advance, and achieving more stable furnace pressure control.

[0044] The wind feedforward command in this embodiment can be obtained through a preset function. The current load of the thermal power unit is input to... middle, Output the corresponding induced draft feedforward command, where, It is a function that corresponds to the unit load and the feedforward command of the primary air fan RB controlled by the induced draft fan, which is obtained in advance by the boiler professional through test verification. The preset function can be a piecewise function or a linear function of a piecewise interval. For example, if the unit load is within a certain range, the feedforward command is the corresponding value. It can also be a one-to-one piecewise linear function, with one unit load corresponding to one feedforward command.

[0045] In one embodiment of this application, before superimposing the induced draft feedforward command and the induced draft fan command, the method includes: obtaining the number of induced draft fans operating in the thermal power unit; if the number of operating fans is the target number, then modifying the induced draft feedforward command.

[0046] The target quantity can be 1 unit.

[0047] It is understood that the embodiments of this application can determine the number of induced draft fans operating in a thermal power unit, and when the number of operating fans is the target number, correct the induced draft feedforward command to adapt to the operating mode of different numbers of induced draft fans in the thermal power unit, so as to avoid insufficient adjustment capacity when a single induced draft fan is running.

[0048] In this embodiment of the application, when the number of induced draft fans is 1, the induced draft feedforward command can be increased by 20% on the original induced draft feedforward command.

[0049] For example, in this embodiment of the application, when the RB action of the primary fan is triggered, the number of induced draft fans currently in operation is determined. If only one induced draft fan is in operation, the induced draft feedforward command is increased by 20% and superimposed on the induced draft fan guide vane control command (i.e., induced draft fan command). If both induced draft fans are in operation, the induced draft feedforward command is directly superimposed on the two induced draft fan control commands (i.e., induced draft fan commands) respectively.

[0050] In one embodiment of this application, after controlling the operation of the induced draft fan in the thermal power unit based on the superimposed command, the method further includes: if the primary fan RB condition is restored, setting the induced draft feedforward command as the target induced draft feedforward command and setting a speed limit for the induced draft feedforward command.

[0051] Among them, the target induced draft feedforward command can be 0.

[0052] It is understood that, in this embodiment of the application, after the primary fan RB operating condition of the thermal power unit is restored, the induced draft feedforward command is set as the target induced draft feedforward command, and a speed limit is set for the induced draft feedforward command to avoid the sudden disappearance of the feedforward causing secondary fluctuations in the furnace pressure, thereby achieving smooth cut-off of the feedforward when the RB is withdrawn.

[0053] For example, in this embodiment of the application, after the primary air blower RB is triggered, the feedforward command is superimposed on the original induced draft fan command for control, so that the induced draft fan command is reduced rapidly to ensure that the furnace negative pressure is quickly stabilized after the primary air volume is reduced. When the primary air blower RB is reset, the induced draft feedforward command can be set to 0, and a speed limit of 0.02% per second is added to prevent the furnace negative pressure from fluctuating too much due to the feedforward command changing too quickly after the RB is reset.

[0054] In one embodiment of this application, shutting down coal mills according to a preset shutdown sequence based on their operating status includes: determining the operating coal mills based on their operating status; sorting the operating coal mills according to the shutdown sequence, directly shutting down the coal mill ranked first, and shutting down the other coal mills in sequence at preset shutdown time intervals, wherein the preset shutdown time interval is less than the shutdown time interval for other types of RB operating conditions except for the primary air fan RB operating condition.

[0055] Direct shutdown means immediate tripping without delay; preset duration is the time interval between shutdowns of coal mills; other types of RB operating conditions can be blower RB, feedwater pump RB, etc.

[0056] It is understood that the embodiments of this application can identify the currently operating coal mills and sort the currently operating coal mills in the thermal power unit according to the preset coal mill shutdown sequence. The coal mill with the highest priority is directly shut down to reduce fuel more quickly and match the air volume rapidly. Other coal mills are shut down in sequence at preset intervals to achieve a smooth reduction in fuel supply and avoid furnace pressure shock caused by sudden fuel reduction. Furthermore, since the core characteristic of the primary air fan RB operating condition is a sudden drop in primary air volume, the risk of air-coal imbalance is higher and the occurrence speed is faster compared to other RB operating conditions. Therefore, the preset shutdown interval is shorter than the shutdown interval of other RBs to further accelerate the overall fuel removal speed and ensure that the fuel reduction speed matches the sudden drop speed of primary air volume.

[0057] Specifically, in this embodiment of the application, after the primary air blower RB is triggered, the first coal mill is tripped without delay, and then the coal mills are tripped in a preset order at preset intervals. The preset interval must be less than the coal mill tripping time interval T of other types of RBs except the primary air blower RB. The time interval T can be determined based on boiler professionals according to the design and operation experience of the unit, the response speed of the control system and the requirements for combustion stability, etc. The preset time of this application can be set to half of the tripping time of other RBs.

[0058] In one embodiment of this application, the control of the opening of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate includes: obtaining the reference feedwater flow rate of the thermal power unit; if the opening degree of the target feedwater pump regulating valve is less than a preset opening degree and the feedwater flow rate is less than the reference feedwater flow rate within a preset proportional range, then the thermal power unit is controlled to adjust the opening degree of the target feedwater pump regulating valve to the preset opening degree.

[0059] Among them, the reference feedwater flow rate can be the maximum feedwater flow rate of the thermal power unit; the preset opening degree is the safety protection opening degree, which can be set according to the actual situation and is not specifically limited; the preset ratio range can be set according to the specific situation and is not specifically limited.

[0060] It is understood that, in the embodiments of this application, when the opening of the target feedwater pump regulating valve is less than the preset opening and the feedwater flow is less than the reference feedwater flow within the preset proportional range, the override control thermal power unit can adjust the opening of the target feedwater pump regulating valve to the preset opening, preventing the feedwater pump from cavitation and tripping due to excessively low flow, protecting the safety of the feedwater system during the primary fan RB load reduction process, and avoiding further tripping of the thermal power unit due to feedwater failure.

[0061] For example, in this embodiment of the application, after the primary fan RB is triggered, if the valve position feedback of the feedwater pump minimum flow recirculation regulating valve is less than the preset opening degree of 33% and the feedwater flow is less than the preset proportional range of 30% to 40% of the maximum feedwater flow of the thermal power unit, the feedwater pump minimum flow recirculation regulating valve is over-released to 33%. The preset opening degree and preset proportional range of the feedwater pump minimum flow regulating valve can be adjusted by the turbine specialist according to the unit and equipment conditions, and no specific limitation is made thereto.

[0062] The following describes the operation control method of the thermal power unit according to an embodiment of this application through a specific example, mainly focusing on the control method of the primary air fan RB operating condition, which includes the following three control parts: I. The control section for furnace pressure after the primary blower RB is triggered.

[0063] When the primary fan RB action is triggered, the current power value P0 of the unit is automatically recorded; the corresponding induced draft feedforward instruction to reduce the induced draft fan instruction is selected according to the current unit power; after the primary fan RB action is triggered, the above induced draft feedforward instruction is not speed-limited; when the primary fan RB action is restored, the induced draft feedforward instruction is restored to 0, and a speed limit of 0.02% per second is added.

[0064] Specifically, the unit power is used as input, and the corresponding feedforward is obtained through the function f(x). Based on the feedforward, the induced draft feedforward command is generated.

[0065] After the primary air blower RB is triggered, the induced draft feedforward command is not limited, so that the induced draft fan control command is reduced quickly to ensure that the furnace negative pressure is stabilized quickly after the primary air volume of the unit is reduced by the primary air blower RB. When the primary air blower RB is reset, the feedforward is set to 0, and a speed limit of 0.02% per second is added to prevent the furnace negative pressure from fluctuating too much due to the feedforward command changing too quickly after the RB is reset.

[0066] In addition, when a fan RB action is triggered, the number of induced draft fans currently in operation is determined. If only one induced draft fan is in operation, the induced draft feedforward command is increased by 20% and superimposed on the guide vane control command of that induced draft fan. If both induced draft fans are in operation, the induced draft feedforward command is directly superimposed on the control commands of the two induced draft fans respectively.

[0067] II. The adaptive control section of the coal mill stops after the primary fan RB is activated.

[0068] When a blower RB action is triggered, the tripping operation of the first coal mill is executed immediately without delay, based on the total number of currently operating coal mills and the pre-set shutdown sequence of coal mills. Subsequently, after a preset time interval T, the tripping operations of the subsequent coal mills are executed in a predetermined order. This time interval must be shorter than the coal mill shutdown time interval of other types of RB.

[0069] It should be noted that the shutdown of the coal mill mainly applies to medium-speed coal mill direct-fired pulverizing systems. This is because such systems lack a pulverized coal silo buffer, and the fuel supply is directly coupled with the primary air volume. Under the RB condition of the primary air fan, the risk of air-coal imbalance is higher and occurs faster. By shortening the shutdown interval of the coal mill, the fuel removal speed can be accelerated, matching the fuel reduction rate with the rapid drop in primary air volume, thereby quickly stabilizing the air-coal ratio and suppressing furnace pressure fluctuations. However, this method can also be applied to other coal mill systems.

[0070] III. Control section of the minimum flow control valve for the feedwater pump after the override action of the primary blower RB.

[0071] When the RB action of the blower is triggered, if the valve position feedback of the minimum flow recirculation regulating valve of the feedwater pump is less than 33% and the feedwater flow is less than 30%~40% of the maximum feedwater flow of the unit, the minimum flow recirculation regulating valve of the feedwater pump is over-released to 33%.

[0072] According to the operation control method for thermal power units proposed in the embodiments of this application, when the thermal power unit is operating under the primary air fan RB condition, the operation of the thermal power unit can be controlled based on the current load and current operating data of the thermal power unit. Specifically, the furnace pressure is quickly stabilized by adjusting the operation of the induced draft fan based on the unit load, the coal quantity is controlled in conjunction with the coal mill shutdown sequence, and the air volume is matched in a timely manner. Override safety protection of the feedwater pump regulating valve is achieved through dual-condition judgment. The control is more targeted, reducing the impact of the primary air fan RB condition on the furnace pressure, fuel quantity control, and feedwater system. It realizes the coordinated control of furnace pressure, coal mill, and feedwater pump regulating valve, and significantly improves the operation stability and safety of the thermal power unit under the primary air fan RB condition.

[0073] Next, the operating control device for thermal power units proposed according to embodiments of this application is described with reference to the accompanying drawings.

[0074] Figure 2 This is a block diagram of the operation control device of a thermal power unit according to an embodiment of this application.

[0075] like Figure 2 As shown, the operation control device 10 of the thermal power unit includes: a monitoring module 100, an acquisition module 200, a first control module 300, and a second control module 400.

[0076] The monitoring module 100 is used to monitor the operating conditions of the thermal power unit; the acquisition module 200 is used to acquire the current load and current operating data of the thermal power unit when the operating condition is the primary air fan RB condition, wherein the operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate; the first control module 300 is used to control the operation of the induced draft fan in the thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit; the second control module 400 is used to shut down the coal mill according to the preset coal mill shutdown sequence based on the coal mill operating status, and to control the opening degree of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override.

[0077] In one embodiment of this application, the first control module 300 is further configured to: determine the corresponding induced draft feedforward command based on the current load; obtain the induced draft fan command of the induced draft fan in the thermal power unit; superimpose the induced draft feedforward command and the induced draft fan command, and control the operation of the induced draft fan in the thermal power unit based on the superimposed command to adjust the furnace pressure.

[0078] In one embodiment of this application, the thermal power unit control device 10 of this application embodiment further includes: a correction module.

[0079] The correction module is used to obtain the number of induced draft fans in the thermal power unit before superimposing the induced draft feedforward command and the induced draft fan command; if the number of fans is the target number, the induced draft feedforward command is corrected.

[0080] In one embodiment of this application, the thermal power unit control device 10 of this application embodiment further includes: a setting module.

[0081] The setting module is used to set the induced draft feedforward command as the target induced draft feedforward command and set a speed limit for the induced draft feedforward command after the induced draft fan in the thermal power unit is restored after the primary fan RB condition is controlled based on the superimposed command.

[0082] In one embodiment of this application, the second control module 400 is further configured to: determine the operating coal mills based on the operating status of the coal mills; sort the operating coal mills according to a preset coal mill shutdown order, directly shut down the coal mill ranked first, and shut down the other coal mills in sequence at preset shutdown time intervals according to the sorted order, wherein the preset shutdown time interval is less than the time interval for shutting down coal mills in other types of RB operating conditions except for the primary air fan RB operating condition.

[0083] In one embodiment of this application, the second control module 400 is further configured to: obtain the reference feedwater flow rate of the thermal power unit; if the opening degree of the target feedwater pump regulating valve is less than the preset opening degree and the feedwater flow rate is less than the reference feedwater flow rate within a preset proportional range, then the override control thermal power unit adjusts the opening degree of the target feedwater pump regulating valve to the preset opening degree.

[0084] It should be noted that the foregoing explanation of the embodiment of the thermal power unit control method also applies to the thermal power unit control device of this embodiment, and will not be repeated here.

[0085] According to the operating control device for thermal power units proposed in the embodiments of this application, when the operating condition of the thermal power unit is the primary air fan RB condition, the operation of the thermal power unit can be controlled based on the current load and current operating data of the thermal power unit. Specifically, the furnace pressure is quickly stabilized by adjusting the operation of the induced draft fan based on the unit load, the coal quantity is controlled in combination with the coal mill shutdown sequence and the air volume is matched in a timely manner, and the override safety protection of the feedwater pump regulating valve is realized through dual condition judgment. The control is more targeted, reducing the impact of the primary air fan RB condition on the furnace pressure, fuel quantity control and feedwater system, realizing the coordinated control of furnace pressure, coal mill and feedwater pump regulating valve, and significantly improving the operating stability and safety of the thermal power unit under the primary air fan RB condition.

[0086] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device may include: The memory 301, the processor 302, and the computer program stored on the memory 301 and capable of running on the processor 302.

[0087] When the processor 302 executes the program, it implements the operation control method for thermal power units provided in the above embodiments.

[0088] Furthermore, electronic devices also include: Communication interface 303 is used for communication between memory 301 and processor 302.

[0089] The memory 301 is used to store computer programs that can run on the processor 302.

[0090] The memory 301 may include high-speed RAM memory, and may also include non-volatile memory, such as at least one disk storage device.

[0091] If the memory 301, processor 302, and communication interface 303 are implemented independently, then the communication interface 303, memory 301, and processor 302 can be interconnected via a bus to complete communication between them. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. Buses can be categorized as address buses, data buses, control buses, etc. For ease of representation, Figure 3 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0092] Optionally, in a specific implementation, if the memory 301, processor 302, and communication interface 303 are integrated on a single chip, then the memory 301, processor 302, and communication interface 303 can communicate with each other through an internal interface.

[0093] Processor 302 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of this application.

[0094] This application also provides a computer-readable storage medium storing a computer program or instructions thereon, which, when executed by a processor, implements the above-described operation control method for thermal power units.

[0095] This application also provides a computer program product, including a computer program or instructions, which, when executed, implement the above-described operation control method for thermal power units.

[0096] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0097] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0098] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0099] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0100] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

Claims

1. A method for operating and controlling a thermal power unit, characterized in that, Includes the following steps: Monitor the operating conditions of thermal power units; When the operating condition is the primary air fan RB condition, the current load and current operating data of the thermal power unit are acquired, wherein the operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate. The operation of the induced draft fan in the thermal power unit is controlled based on the current load to stabilize the furnace pressure of the thermal power unit. Based on the operating status of the coal mill, the coal mill is shut down according to the preset coal mill shutdown sequence, and the opening of the target feedwater pump regulating valve is controlled based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override.

2. The operation control method for thermal power units according to claim 1, characterized in that, The method of controlling the operation of the induced draft fan in the thermal power unit based on the current load to stabilize the furnace pressure of the thermal power unit includes: Determine the corresponding draft feedforward command based on the current load; Obtain the induced draft fan command from the induced draft fan in the thermal power unit; The induced draft feedforward command is superimposed with the induced draft fan command, and the operation of the induced draft fan in the thermal power unit is controlled based on the superimposed command to regulate the furnace pressure.

3. The operation control method for thermal power units according to claim 2, characterized in that, Before superimposing the induced draft feedforward command with the induced draft fan command, the following steps are included: Obtain the number of induced draft fans operating in the thermal power unit; If the number of operations is the target number, then the induced draft feedforward command is corrected.

4. The operation control method for thermal power units according to claim 2, characterized in that, After controlling the operation of the induced draft fan in the thermal power unit based on the superimposed instructions, the method further includes: If the primary wind turbine RB operating condition is restored, the induced draft feedforward command is set as the target induced draft feedforward command, and a speed limit is set for the induced draft feedforward command.

5. The operation control method for thermal power units according to claim 1, characterized in that, The step of shutting down the coal mill according to a preset shutdown sequence based on the operating status of the coal mill includes: The operating coal mill is determined based on the aforementioned operating status; The operating coal mills are sorted according to the preset coal mill shutdown order. The coal mill ranked first is shut down directly, and the other coal mills are shut down sequentially at preset shutdown time intervals according to the sorted order. The preset shutdown time interval is less than the shutdown time interval for coal mills in other types of RB operating conditions except for the primary air fan RB operating condition.

6. The operation control method for thermal power units according to claim 1, characterized in that, The method of controlling the opening of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override includes: Obtain the reference feedwater flow rate of the thermal power unit; If the opening degree of the target feedwater pump regulating valve is less than the preset opening degree, and the feedwater flow rate is less than the reference feedwater flow rate within the preset proportional range, then the override control of the thermal power unit will adjust the opening degree of the target feedwater pump regulating valve to the preset opening degree.

7. An operation control device for a thermal power unit, characterized in that, include: The monitoring module is used to monitor the operating conditions of thermal power units; The acquisition module is used to acquire the current load and current operating data of the thermal power unit when the operating condition is the primary air fan RB condition. The operating data includes at least one of the following: the operating status of the coal mill in the thermal power unit, the opening degree of the target feedwater pump regulating valve, and the feedwater flow rate. The first control module is used to control the operation of the induced draft fan in the thermal power unit based on the current load, so as to stabilize the furnace pressure of the thermal power unit. The second control module is used to shut down the coal mill according to a preset coal mill shutdown sequence based on the coal mill's operating status, and to control the opening of the target feedwater pump regulating valve based on the opening degree of the target feedwater pump regulating valve and the feedwater flow rate override.

8. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the operation control method for a thermal power unit as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, The computer program or instructions are executed by a processor to implement the operation control method for thermal power units as described in any one of claims 1-6.

10. A computer program product, comprising a computer program or instructions, characterized in that, When the computer program or instructions are executed, they implement the operation control method for thermal power units as described in any one of claims 1-6.

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