A safety monitoring system and method suitable for joint door participation in heat supply regulation of a thermal power unit

Abstract

The present application belongs to the field of steam turbine power generation, and discloses a safety monitoring method and system suitable for the heat supply of the middle link door in a thermal power unit. The present application can effectively predict the position of the high-temperature area of the last few stages of the high-pressure through-flow area, finely evaluate the stress peak value of the through-flow area partition plate, static blade and dynamic blade, effectively evaluate the strength of the valve rod of the middle link door and the vibration of the valve body, and prospectively warn the oil pressure stability of the high-pressure EH oil supply system, the leakage rate of the EH oil system and the piston wear and jam of the oil motor. The present application significantly improves the safety and stability of the unit operation under partial load conditions, and compared with the manual monitoring method, the present application eliminates the interference of human factors, is helpful to improve the monitoring accuracy and real-time performance, and has universal applicability to the safety monitoring and early warning of the current unit deep peak shaving and heat supply operation state.

Description

Technical Field

[0001] This invention belongs to the field of steam turbine power generation, specifically relating to a safety monitoring system and method for interlocking valve-controlled heating in thermal power units. Background Technology

[0002] As wind and solar power account for an increasingly larger share of the power system and gradually become the main component, the significant randomness, intermittency, and volatility of renewable energy pose a huge challenge to the stability and security of the power system. Enhancing the flexibility of the power system has become key to building a new type of power system. Deep peak shaving will become the norm for thermal power units, laying the foundation for large-scale grid integration of new energy sources.

[0003] High-temperature steam drawn from cold or hot reheat pipelines by thermal power units, after being desuperheated and depressurized, is supplied to heat users. This is an important and widely used method of industrial heating in cogeneration. However, with the normalization of deep peak shaving by the units, on the one hand, the sliding pressure of the cold or hot reheat steam will gradually decrease during operation; on the other hand, due to the influence of boiler reheater heat balance and unit axial thrust, technical problems often arise at the low and medium load boundaries where the pressure and flow of the cogeneration unit's heating main pipe do not meet user needs.

[0004] To ensure user demand under deep peak-shaving conditions, a throttling operation involving the intermediate valve can be adopted. The technical method involves adjusting the opening of the turbine's intermediate valve to throttle the steam, causing the steam entering the turbine's intermediate-pressure cylinder to stagnate in a limited local space before the valve, creating a "pressure buildup" effect. Under the influence of pressure wave energy transfer, this increases the steam pressure in the cold or hot reheat pipelines. Furthermore, after throttling the intermediate valve, the work capacity in the low-pressure flow zone of the unit decreases, leading to a reduction in load. This not only increases heating capacity but also further promotes peak-shaving depth and enhances the unit's thermoelectric decoupling capability.

[0005] Considering that the initial design boundary of conventional large-capacity thermal power units is to bear the grid's baseline load, the intermediate valve of the unit will be in a normally open and non-adjustable state under normal operating conditions. Therefore, existing operation monitoring and early warning systems mainly target operating conditions of 50% THA and above, and do not cover operating conditions where the intermediate valve participates in regulation. Under the current background of normalized long-cycle deep peak shaving, the existing system cannot comprehensively monitor and evaluate the safety status of the unit and provide early warnings, which will pose potential safety hazards to the unit. Therefore, it is urgent to develop a supplementary intelligent new intermediate valve-assisted heating safety monitoring system, which is of great significance for promoting the safe and reliable operation of the unit under partial load conditions. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a safety monitoring system and method suitable for intermediate valve-controlled heating in thermal power units, which can provide safety warnings and assessments of the turbine body operation, key components and major auxiliary systems during intermediate valve-controlled heating.

[0007] To achieve the above objectives, a safety monitoring method applicable to interlocking valve-controlled heating in thermal power units includes the following steps:

[0008] Under the Zhonglian Gate Parameter Adjustment Heating Mode, real-time monitoring is conducted on the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blower operation in the high-pressure flow zone, the static pressure difference between the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the high-pressure cylinder experiences flow-induced vibration.

[0009] Real-time monitoring of blade stage temperature information at the outlet of the second and final stage moving blades of the intermediate pressure cylinder during blow-through, changes in static pressure difference at the inlet and outlet sections of the final stage stationary blade of the intermediate pressure cylinder, and blade flutter pulse response during flow-induced vibration in the trailing edge region of the final stage moving blade of the intermediate pressure cylinder within the intermediate pressure flow passage.

[0010] Real-time monitoring of valve stem strength and valve body vibration information of Zhonglian gate;

[0011] Real-time monitoring of the oil pressure stability of the high-pressure EH oil supply system, the leakage rate of the EH oil system, and the wear and jamming information of the oil actuator piston;

[0012] All detected data are compared with preset thresholds, and the comparison results are output.

[0013] All monitored data are processed, and a safety boundary database is obtained through optimization calculations to establish the final safe operating boundary under the target load.

[0014] The real-time monitoring information on the stem strength and body vibration of the Zhonglian valve specifically includes:

[0015] Information on valve body strain of the outer valve cover of the intermediate pressure regulating valve, displacement information of the intermediate pressure regulating valve, and damage information of the intermediate valve of the turbine outside the intermediate valve.

[0016] The real-time monitoring of the high-pressure EH oil supply system's oil pressure stability, EH oil system leakage rate, and hydraulic actuator piston wear and jamming information specifically includes:

[0017] Information on oil pressure pulsation on the EH oil pump outlet pipeline, information on thermal aging and fracture of the O-ring seal of the regulating valve, and strain and displacement of the cylinder body.

[0018] A safety monitoring system for interlocking valve-controlled heating in thermal power units includes:

[0019] The high-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blower operation, the static pressure difference between the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the high-pressure cylinder is subjected to flow-induced vibration under the central gate parameter regulation heating mode.

[0020] The medium-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stages of the medium-pressure cylinder during blower operation, the change of static pressure difference between the inlet and outlet sections of the final stage stationary blade of the medium-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the medium-pressure cylinder is subjected to flow-induced vibration under the central gate-controlled heating mode.

[0021] The Zhonglian valve body monitoring module is used to monitor the strength of the Zhonglian valve stem and the vibration information of the valve body in real time under the Zhonglian valve parameter regulation heating mode.

[0022] The high-pressure fire-resistant oil system monitoring module is used to monitor the oil pressure stability, EH oil system leakage rate, and oil motor piston wear and jamming information of the high-pressure EH oil supply system in real time under the Zhonglianmen parameter regulation heating mode.

[0023] The control data analysis center is used to compare all detected data with preset thresholds and output the comparison results.

[0024] The high-voltage flow zone monitoring module includes a first temperature sensor, a first differential pressure sensor, and a first vibration measurement sensor;

[0025] The first temperature sensor is installed at the outlet of the second and final stage moving blades of the high-pressure cylinder, the first differential pressure sensor is installed before and after the final stage stationary blade of the high-pressure cylinder, and the first vibration measurement sensor is installed after the final stage moving blade of the high-pressure cylinder.

[0026] The medium-pressure flow zone monitoring module includes a second temperature sensor, a second differential pressure sensor, and a second vibration measurement sensor;

[0027] The second temperature sensor is installed at the outlet of the second and final stage moving blades of the intermediate pressure cylinder, the second differential pressure sensor is installed before and after the final stage stationary blade of the intermediate pressure cylinder, and the second vibration measurement sensor is installed after the final stage moving blade of the intermediate pressure cylinder.

[0028] The Zhonglian valve body monitoring module includes strain sensors, displacement sensors, and ultrasonic response sensors;

[0029] The strain sensor is installed on the outer valve cover of the medium-pressure regulating valve, the displacement sensor is installed in the inner valve cover and bushing area of ​​the medium-pressure regulating valve, and the ultrasonic response sensor is installed on the turbine platform outside the central valve.

[0030] The high-pressure fire-resistant oil system monitoring module includes a dynamic pressure sensor, an acoustic emission sensor, and a fiber optic grating sensor;

[0031] The dynamic pressure sensor is installed on the pipeline at the outlet of the EH oil pump, the acoustic emission sensor is installed next to the O-ring seal of the regulating valve, and the fiber optic grating sensor is installed on the wall of the hydraulic cylinder of the hydraulic actuator.

[0032] The control data analysis center connects to the boundary adjustment management terminal, which is used to perform optimization calculations on the data sent by the control data analysis center to obtain a safety boundary database and establish the safety operating boundary under the final target load.

[0033] Compared with existing technologies, this invention monitors key components in the high-pressure and medium-pressure flow zones in real time under the central valve-controlled heating mode. It also monitors the strength of the central valve stem and valve body vibration, as well as the oil pressure stability, leakage rate, and wear and jamming of the hydraulic actuator piston in the high-pressure EH oil supply system. Finally, all detected data is compared with preset thresholds, and the comparison results are output. This invention can effectively predict the location of the high-temperature zone in the last few stages of the high- and medium-pressure flow zones, accurately assess the peak stress of the baffles, stationary blades, and moving blades in the flow zone, effectively evaluate the strength of the central valve stem and valve body vibration, and provide early warnings of oil pressure stability, leakage rate, and wear and jamming of the hydraulic actuator piston in the high-pressure EH oil supply system. This significantly improves the operational safety and stability of the unit under partial load conditions. Compared with manual monitoring, it eliminates human interference, improving monitoring accuracy and real-time performance. The system is universally applicable to safety monitoring and early warning issues during the current deep peak-shaving heating operation of the unit.

[0034] Furthermore, the present invention can process all monitored data, obtain a safety boundary database through optimization calculation, establish the safety operating boundary under the final target load, and find and adjust the unit to the optimal operating boundary value under the target heating capacity in real time according to the prompts, thereby adjusting the safety and economy of the unit.

[0035] The system of this invention includes a high-pressure flow zone monitoring module, a medium-pressure flow zone monitoring module, a central valve body monitoring module, and a high-pressure fire-resistant oil system monitoring module. It can acquire full-time-domain linkage safety characteristic data of the unit during central valve parameter adjustment from multiple perspectives, including turbine operation, key components, and major auxiliary systems. The control data analysis center receives the transmitted safety characteristic data, compares it comprehensively with preset thresholds, and outputs the comparison results to evaluate the unit's operational safety.

[0036] Furthermore, the present invention is equipped with a boundary adjustment management terminal, which can use a built-in digital twin model and an adaptive particle swarm optimization algorithm to identify and adjust the unit to the optimal operating boundary value under the target heat supply. Attached Figure Description

[0037] Figure 1 This is a flowchart of the present invention;

[0038] Figure 2 This is a system diagram of the present invention. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] See Figure 1 A safety monitoring method for interlocking valve-controlled heating in thermal power units includes the following steps:

[0041] S1, under the central gate parameter regulation heating mode, real-time monitoring of the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blowering, the change of static pressure difference between the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the high-pressure cylinder is subjected to flow-induced vibration.

[0042] S2, real-time monitoring of the blade stage temperature information at the outlet of the second and final stage moving blades of the medium-pressure cylinder during blow-through, the change of static pressure difference at the inlet and outlet sections of the final stage stationary blade of the medium-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the medium-pressure cylinder is subjected to flow-induced vibration.

[0043] S3 monitors the strength of the valve stem and the vibration information of the valve body in real time, including the valve body strain information of the outer valve cover of the intermediate pressure regulating valve, the displacement information of the intermediate pressure regulating valve, and the damage information of the intermediate valve of the turbine outside the intermediate valve.

[0044] S4 monitors in real time the oil pressure stability of the high-pressure EH oil supply system, the leakage rate of the EH oil system, and the wear and jamming information of the oil motor piston, including the oil pressure pulsation information on the EH oil pump outlet pipeline, the heat aging and fracture information of the regulating valve O-ring seal, and the strain and displacement of the oil cylinder body.

[0045] S5 compares all detected data with preset thresholds and outputs the comparison results.

[0046] S6 processes all monitored data, obtains a safety boundary database through optimization calculations, and establishes the final safe operating boundary under the target load.

[0047] See Figure 2 A safety monitoring system for interlocking valve-controlled heating in thermal power units, comprising:

[0048] The high-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blower operation, the change of static pressure difference at the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response during flow-induced vibration in the trailing edge region of the final stage moving blade of the high-pressure cylinder under the central gate-controlled heating mode. The high-pressure flow zone monitoring module includes a first temperature sensor, a first differential pressure sensor, and a first vibration measurement sensor. The first temperature sensor is located at the outlet of the second and final stage moving blades of the high-pressure cylinder, the first differential pressure sensor is located before and after the final stage stationary blade of the high-pressure cylinder, and the first vibration measurement sensor is located after the final stage moving blade of the high-pressure cylinder.

[0049] The medium-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stage moving blades of the medium-pressure cylinder during blower operation, the static pressure difference change at the inlet and outlet sections of the final stage stationary blade of the medium-pressure cylinder, and the blade flutter pulse response during flow-induced vibration in the trailing edge region of the final stage moving blade of the medium-pressure cylinder under the central gate-controlled heating mode. The medium-pressure flow zone monitoring module includes a second temperature sensor, a second differential pressure sensor, and a second vibration measurement sensor. The second temperature sensor is located at the outlet of the second and final stage moving blades of the medium-pressure cylinder, the second differential pressure sensor is located before and after the final stage stationary blade of the medium-pressure cylinder, and the second vibration measurement sensor is located after the final stage moving blade of the medium-pressure cylinder.

[0050] The Zhonglian valve body monitoring module is used to monitor the valve stem strength and valve body vibration information in real time under the Zhonglian valve's parameter-controlled heating mode. The Zhonglian valve body monitoring module includes a strain sensor, a displacement sensor, and an ultrasonic response sensor. The strain sensor is installed on the outer valve cover of the medium-pressure regulating valve, the displacement sensor is installed on the inner valve cover and bushing area of ​​the medium-pressure regulating valve, and the ultrasonic response sensor is installed on the outer turbine platform of the Zhonglian valve.

[0051] The high-pressure fire-resistant oil system monitoring module is used to monitor the oil pressure stability, EH oil system leakage rate, and piston wear and jamming information of the high-pressure EH oil supply system in real time under the central valve-controlled heating mode. The high-pressure fire-resistant oil system monitoring module includes a dynamic pressure sensor, an acoustic emission sensor, and a fiber optic grating sensor. The dynamic pressure sensor is installed on the pipeline at the outlet of the EH oil pump, the acoustic emission sensor is installed next to the O-ring seal of the regulating valve, and the fiber optic grating sensor is installed on the wall of the oil cylinder of the oil motor.

[0052] The control data analysis center is used to compare all detected data with preset thresholds and output the comparison results.

[0053] The control data analysis center connects to the boundary adjustment management terminal, which is used to perform optimization calculations on the data sent by the control data analysis center to obtain a safety boundary database and establish the safety operating boundary under the final target load.

[0054] Example:

[0055] Taking a certain unit as an example, the present invention includes an equipment monitoring unit for acquiring core safety feature data of multiple components of the unit in the entire time domain when the unit is in the process of heating with the central gate parameter regulation.

[0056] The control data analysis center is used to receive safety feature data transmitted by the equipment monitoring unit, compare it with built-in expert data, and conduct a comprehensive evaluation of the unit's operational safety.

[0057] The boundary adjustment management terminal uses an embedded digital twin model and an adaptive particle swarm optimization algorithm to identify and adjust the unit to the optimal operating boundary value under the target heating capacity.

[0058] The equipment monitoring unit includes a high-pressure flow zone monitoring module, a medium-pressure flow zone monitoring module, a central valve body monitoring module, and a high-pressure fire-resistant oil system monitoring module.

[0059] The high-pressure flow zone monitoring module is used to evaluate the condition of the last few stages of the high-pressure flow zone blower and the strength of the high-pressure baffle, stationary blades, and moving blades under the interlocking gate heating mode. The high-pressure flow zone monitoring module has a built-in first temperature sensor, a first differential pressure sensor, a first vibration measurement sensor, and a first multi-core processor.

[0060] The measurement signals acquired by all sensors in the high-voltage current-carrying zone monitoring module are modulated using double-sideband modulation with suppressed carrier. Here, the band signal is m(t), the carrier frequency is fc, and the modulated signal is s(t).

[0061] S(t)=m(t)cos(2πf c )t

[0062] After demodulation and transmission to a multi-core processor, the data is initially processed using a threshold discrimination method.

[0063] The first temperature sensor is an integrated temperature sensor based on CMOS technology. The resistor, MOSFET or BJT provided by standard CMOS technology are used as temperature sensing devices. It is installed at the outlet of the moving blades of the 8th and 9th stages of the high-pressure cylinder to monitor the blade-level temperature information when the blower is generated.

[0064] The first differential pressure sensor features a robust stainless steel housing. Its two pressure ports are equipped with high-quality AISI 316L stainless steel alloy diaphragms. Pressure is transmitted to the sensor chip via an oil-filled, media-isolated sensor unit. It integrates signal conditioning and provides a calibrated analog output signal with high electromagnetic interference (EMI) immunity from 0.5V to 4.5V. Installed before and after the nozzle of the 9th stage stator vane in the high-pressure cylinder, it monitors changes in the static pressure difference between the inlet and outlet sections of the final stage stator vane, providing early warning of blowout phenomena. An alarm signal will be output when the current measured value of the differential pressure sensor reaches 1.3 times the measured value under 40% THA conditions.

[0065] The first vibration measurement sensor uses a high-frequency reflective eddy current sensor. The characteristic relationship between the eddy current of the measured object, the outer and inner diameters of the probe coil, the eddy current depth, and the physical parameters of the measured material and the coil excitation frequency is as follows:

[0066] D represents the diameter of the probe coil, R is the outer radius of the eddy current, h is the depth of the eddy current, r is the inner radius of the eddy current, ρ is the resistivity of the measured object, μ is the relative permeability of the measured object, and f is the excitation frequency of the coil.

[0067] 2R = 2.48D

[0068] 2r = 0.625D

[0069]

[0070] The measurement signals acquired by all sensors are demodulated and transmitted to the first multi-core processor for data forwarding.

[0071] The medium-pressure flow zone monitoring module is used to assess the blower conditions of the last few stages in the medium-pressure flow zone under the interlocking gate-controlled heating system, as well as the strength of the baffles, stationary blades, and moving blades. The medium-pressure flow zone monitoring module incorporates a second temperature sensor, a second differential pressure sensor, a second vibration measurement sensor, and a second multi-core processor.

[0072] The second temperature sensor also uses an integrated temperature sensor based on CMOS technology. The standard CMOS technology provides resistors, MOSFETs, or BJTs as temperature sensing devices. The second temperature sensor is installed at the outlet of the moving blades of the 12th and 13th stages of the intermediate pressure cylinder to monitor the blade-level temperature information when the blower is generated.

[0073] The second differential pressure sensor features a robust stainless steel housing. Its two pressure ports are equipped with high-quality AISI 316L stainless steel alloy diaphragms. Pressure is transmitted to the sensor chip via an oil-filled, media-isolated sensor unit. It integrates signal conditioning and provides a calibrated analog output signal with high electromagnetic interference (EMI) immunity from 0.5V to 4.5V. The differential pressure sensor is installed before and after the 13th stage stator vane of the intermediate-pressure cylinder to monitor changes in the static pressure difference between the inlet and outlet sections of the final stage stator vane, providing early warning of blower phenomena. An alarm signal will be output when the current measured value of the second differential pressure sensor reaches 1.15 times the measured value under 50% THA conditions.

[0074] The second vibration measurement sensor is installed after the last stage moving blade of the intermediate pressure cylinder to monitor the blade flutter pulse response during flow-induced vibration in the trailing edge region and to assess the strength of the moving blade.

[0075] The measurement signals acquired by all sensors are demodulated and transmitted to the second multi-core processor for data forwarding.

[0076] The Zhonglian valve body monitoring module is used to evaluate and monitor the valve stem strength and valve body vibration of Zhonglian valves under the parameter-controlled heating mode. The module incorporates a strain sensor, a displacement sensor, an ultrasonic response sensor, and a multi-core processor.

[0077] The strain sensor uses the RFID tag antenna itself as the strain sensing unit, and indirectly measures strain by utilizing the linear relationship between the strain and resonant frequency drift of the microstrip patch antenna. The characteristic relationship between the resonant frequency and the length of the microstrip patch antenna is as follows:

[0078]

[0079] The radiating patch has a length of L, a width of W, and a thickness of h. The relative permittivity of the dielectric substrate is ε. r The resonant frequency is f0; the radio frequency identification strain sensor is installed on the outer valve cover of the medium-pressure regulating valve to monitor the strain information of the valve body.

[0080] The displacement sensor employs a magnetostrictive displacement sensor, which accurately measures position by generating a strain pulse signal through the intersection of two different magnetic fields. During the measurement process, a current pulse is generated within the sensor's electronic chamber. This current pulse propagates within the waveguide, generating a circumferential magnetic field outside the waveguide. When this magnetic field intersects with the magnetic field generated by a movable magnetic ring fitted on the waveguide to indicate position change, a strain mechanical wave pulse signal is generated within the waveguide under the action of magnetostriction. The displacement sensor is installed in the valve cover and bushing area inside the medium-pressure regulating valve to capture and monitor the valve's displacement information and provide early warning of valve body vibration.

[0081] The ultrasonic response sensor has a detection range of 300–500 mm wavelength and an acoustic emission angle of 12°–15°. It features temperature compensation and can achieve a repeatability accuracy of up to 0.6 mm over a wide temperature range.

[0082] The temperature compensation calculation formula is as follows:

[0083] V = 335.6 + 0.725T

[0084] In the formula: V is the speed of ultrasonic wave propagation in air; T is the ambient temperature.

[0085] An ultrasonic response sensor is installed on the turbine platform outside the central gate to assess the type of damage to the central gate under abnormal conditions.

[0086] The measurement signals acquired by the strain sensor, displacement sensor, and ultrasonic response sensor of the Zoomlion valve body monitoring module are demodulated and transmitted to the multi-core processor, where the data is initially processed using a threshold discrimination method.

[0087] The high-pressure fire-resistant oil system monitoring module is used to evaluate and monitor the oil pressure stability, EH oil system leakage rate, and wear and jamming of the oil actuator piston under the Zhonglian valve-controlled heating mode. The Zhonglian valve body monitoring module incorporates a high-frequency dynamic pressure sensor, an acoustic emission sensor, a fiber optic grating sensor, and a multi-core processor.

[0088] The high-frequency dynamic pressure sensor has a measurement range of 0.200Pa-100MPa, a constant current power supply range of 6-10mA DC, a constant voltage power supply range of 15VDC, a zero-point output range of VOS-±10mV, and an operating temperature range from -40℃ to +550℃, with instantaneous high temperatures exceeding 600℃. It is installed on the pipeline at the outlet of the EH oil pump to measure and evaluate pipeline oil pressure pulsations.

[0089] The piezoelectric material of the acoustic emission sensor is a quartz crystal, which is installed in the O-ring area of ​​the regulating valve to monitor the heat aging and fracture of the sealing ring and assess the damage and oil leakage rate.

[0090] Fiber Bragg grating (FBG) sensors are tubularly packaged and primarily manufactured from stainless steel tubes, FBGs, and metal rings. FBGs are Bragg fiber grating structures, with the fiber core changing periodically along the axial direction while the optical period remains constant, resulting in high reflectivity and a narrow reflection spectrum. FBG sensors are mounted on the wall of hydraulic actuator cylinders to measure cylinder strain and displacement, and to identify wear and jamming. Measurement signals acquired by dynamic pressure sensors, acoustic emission sensors, and FBG sensors are demodulated and transmitted to a multi-core processor, where a threshold discrimination method is used for preliminary data processing.

[0091] The Control Data Analysis Center, based on an embedded web platform, receives safety characteristic data transmitted from equipment monitoring units and periodically stores it in a MySQL database. It features real-time information monitoring, historical alarm information, and historical environmental data analysis. Every 5 seconds, the Control Data Analysis Center retrieves safety characteristic data from the equipment monitoring units and stores it in the MySQL database. It connects to the database by executing SQL statements and releases the connection after the data processing is complete. Historical alarm information is displayed in a linked format using pie charts and bar charts, facilitating timely detection of faults and safety hazards. The historical environmental data analysis function visualizes alarm information from four dimensions: annual, monthly, weekly, and daily reports. The Control Data Analysis Center also has a built-in expert database covering characteristic parameter safety boundaries from unit tests and simulations under different steam inlet parameters, installed capacities, and heating flow rates. The Control Data Analysis Center conducts multi-source data fusion analysis on the received and transmitted safety characteristic data, comprehensively compares it with the built-in expert data, and ultimately evaluates the unit's operational safety.

[0092] The boundary adjustment management terminal is associated with the plant-level real-time and historical monitoring information system. It has an embedded digital twin model and uses an adaptive particle swarm optimization algorithm to optimize the safety boundary database obtained through calculation. It establishes the optimal safe operating boundary under the final target load, prompts the identification and adjustment of the unit to the optimal operating boundary value under the target heat supply, and finally prompts the unit to make safety and economic adjustments.

Claims

1. A safety monitoring method applicable to interlocking gate heating in thermal power units, characterized in that, Includes the following steps: Under the Zhonglian Gate Parameter Adjustment Heating Mode, real-time monitoring is conducted on the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blower operation in the high-pressure flow zone, the static pressure difference between the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the high-pressure cylinder experiences flow-induced vibration. Real-time monitoring of blade stage temperature information at the outlet of the second and final stage moving blades of the intermediate pressure cylinder during blow-through, changes in static pressure difference at the inlet and outlet sections of the final stage stationary blade of the intermediate pressure cylinder, and blade flutter pulse response during flow-induced vibration in the trailing edge region of the final stage moving blade of the intermediate pressure cylinder within the intermediate pressure flow passage. Real-time monitoring of valve stem strength and valve body vibration information of Zhonglian gate; Real-time monitoring of the oil pressure stability of the high-pressure EH oil supply system, the leakage rate of the EH oil system, and the wear and jamming information of the oil actuator piston; All detected data are compared with preset thresholds, and the comparison results are output.

2. The safety monitoring method for interlocking valve-controlled heating in thermal power units according to claim 1, characterized in that, All monitored data are processed, and a safety boundary database is obtained through optimization calculations to establish the final safe operating boundary under the target load.

3. The safety monitoring method for interlocking valve-controlled heating in thermal power units according to claim 1, characterized in that, The real-time monitoring information on the stem strength and body vibration of the Zhonglian valve specifically includes: Information on valve body strain of the outer valve cover of the intermediate pressure regulating valve, displacement information of the intermediate pressure regulating valve, and damage information of the intermediate valve of the turbine outside the intermediate valve.

4. The safety monitoring method for interlocking valve-controlled heating in thermal power units according to claim 1, characterized in that, The real-time monitoring of the high-pressure EH oil supply system's oil pressure stability, EH oil system leakage rate, and hydraulic actuator piston wear and jamming information specifically includes: Information on oil pressure pulsation on the EH oil pump outlet pipeline, information on thermal aging and fracture of the O-ring seal of the regulating valve, and strain and displacement of the cylinder body.

5. A safety monitoring system suitable for interlocking valve-controlled heating in thermal power units, characterized in that, include: The high-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stage moving blades of the high-pressure cylinder during blower operation, the static pressure difference between the inlet and outlet sections of the final stage stationary blade of the high-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the high-pressure cylinder is subjected to flow-induced vibration under the central gate parameter regulation heating mode. The medium-pressure flow zone monitoring module is used to monitor in real time the blade-level temperature information at the outlet of the second and final stages of the medium-pressure cylinder during blower operation, the change of static pressure difference between the inlet and outlet sections of the final stage stationary blade of the medium-pressure cylinder, and the blade flutter pulse response when the trailing edge region of the final stage moving blade of the medium-pressure cylinder is subjected to flow-induced vibration under the central gate-controlled heating mode. The Zhonglian valve body monitoring module is used to monitor the strength of the Zhonglian valve stem and the vibration information of the valve body in real time under the Zhonglian valve parameter regulation heating mode. The high-pressure fire-resistant oil system monitoring module is used to monitor the oil pressure stability, EH oil system leakage rate, and oil motor piston wear and jamming information of the high-pressure EH oil supply system in real time under the Zhonglianmen parameter regulation heating mode. The control data analysis center is used to compare all detected data with preset thresholds and output the comparison results.

6. A safety monitoring system for interlocking valve-based heating in thermal power units according to claim 5, characterized in that, The high-voltage flow zone monitoring module includes a first temperature sensor, a first differential pressure sensor, and a first vibration measurement sensor; The first temperature sensor is installed at the outlet of the second and final stage moving blades of the high-pressure cylinder, the first differential pressure sensor is installed before and after the final stage stationary blade of the high-pressure cylinder, and the first vibration measurement sensor is installed after the final stage moving blade of the high-pressure cylinder.

7. A safety monitoring system for interlocking valve-controlled heating in thermal power units according to claim 5, characterized in that, The medium-pressure flow zone monitoring module includes a second temperature sensor, a second differential pressure sensor, and a second vibration measurement sensor; The second temperature sensor is installed at the outlet of the second and final stage moving blades of the intermediate pressure cylinder, the second differential pressure sensor is installed before and after the final stage stationary blade of the intermediate pressure cylinder, and the second vibration measurement sensor is installed after the final stage moving blade of the intermediate pressure cylinder.

8. A safety monitoring system for interlocking valve-controlled heating in thermal power units according to claim 5, characterized in that, The Zhonglian valve body monitoring module includes strain sensors, displacement sensors, and ultrasonic response sensors; The strain sensor is installed on the outer valve cover of the medium-pressure regulating valve, the displacement sensor is installed in the inner valve cover and bushing area of ​​the medium-pressure regulating valve, and the ultrasonic response sensor is installed on the turbine platform outside the central valve.

9. A safety monitoring system for interlocking valve-controlled heating in thermal power units according to claim 5, characterized in that, The high-pressure fire-resistant oil system monitoring module includes a dynamic pressure sensor, an acoustic emission sensor, and a fiber optic grating sensor; The dynamic pressure sensor is installed on the pipeline at the outlet of the EH oil pump, the acoustic emission sensor is installed next to the O-ring seal of the regulating valve, and the fiber optic grating sensor is installed on the wall of the hydraulic cylinder of the hydraulic actuator.

10. A safety monitoring system for interlocking valve-controlled heating in thermal power units according to claim 5, characterized in that, The control data analysis center connects to the boundary adjustment management terminal, which is used to perform optimization calculations on the data sent by the control data analysis center to obtain a safety boundary database and establish the safety operating boundary under the final target load.

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