Transformation system for front isolating valve of main steam valve of No.1 steam turbine

Abstract

The invention relates to the technical field of steam turbine operation and maintenance, in particular to a transformation system for a front isolating valve of a main steam valve of a first steam turbine, which comprises a front isolating valve assembly of the main steam valve, a multi-stage drainage linkage unit, a pressure monitoring and protecting module and a lubricating oil linkage control unit, wherein the main steam valve front isolating valve assembly is connected with the multi-stage drainage linkage unit and the lubricating oil linkage control unit, the multi-stage drainage linkage unit is connected with the pressure monitoring and protecting module, and the pressure monitoring and protecting module is connected with the isolating valve assembly. The main steam valve front isolating valve assembly is used for cutting off steam circulation; the multi-stage drainage linkage unit is used for discharging residual steam; the pressure monitoring and protecting module is used for monitoring upstream and downstream pressure of the isolating valve in real time; the lubricating oil linkage control unit is used for controlling starting and stopping of the lubricating oil system according to the isolation state. Therefore, the problems of high misjudgment rate, response lag, poor sealing performance and the like in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of steam turbine operation and maintenance, in particular to a reform system of a front isolation valve of a main steam valve of a No. 1 steam turbine. BACKGROUND

[0002] Under the background of increasing demand for efficient and stable operation of modern power systems, the contradiction between safety maintenance and economic operation of steam turbines as core power equipment is becoming increasingly prominent. Especially for units adopting the main steam header system, under the cross-operation condition of multiple units, the front of the main steam valve of the No. 1 steam turbine lacks a special isolation valve, which seriously limits the flexibility of unit maintenance. At the same time, with the increasing requirements of power plants for cost reduction and efficiency improvement and energy saving and emission reduction, the problems of high energy consumption and high loss caused by steam leakage of the main steam valve and continuous operation of the lubricating oil system under the traditional operation mode need to be solved. Therefore, developing a reform system capable of realizing dynamic isolation of the No. 1 steam turbine and the main steam system, while considering the convenience of maintenance and the economy of operation, has important significance for improving the overall operation level of the power plant and reducing the operation and maintenance cost.

[0003] However, the existing steam turbine isolation technology has many drawbacks. The traditional temporary blind plate isolation method needs to be operated with shutdown, which not only consumes a lot of manpower and material resources, but also has poor sealing performance and safety hazards. Some methods that indirectly isolate by adjusting the load of adjacent units will seriously affect the stability of heat supply and the flexibility of power grid scheduling. In addition, the existing system lacks a special isolation device for the main steam header system, and cannot effectively solve the problem of dynamic decoupling of the steam turbine and the steam system under cross-operation. At the same time, the traditional scheme lacks real-time monitoring and linkage control of the pressure of the isolated pipeline and the state of the equipment, which leads to the dependence of maintenance on manual inspection, and has problems of response lag and high misjudgment rate, which cannot meet the needs of intelligent and refined operation and maintenance of modern power plants, and has a significant adverse effect on the safe and stable operation and economic benefits of the unit. SUMMARY

[0004] The application provides a reform system of a front isolation valve of a main steam valve of a No. 1 steam turbine to solve the problems of high misjudgment rate, response lag and poor sealing performance in the prior art.

[0005] The first aspect embodiment of the application provides a reform system of a front isolation valve of a main steam valve of a No. 1 steam turbine, comprising: a front isolation valve assembly of a main steam valve, a multi-stage drainage linkage unit, a pressure monitoring and protection module, a lubricating oil linkage control unit; wherein the front isolation valve assembly of the main steam valve is installed on a high-pressure main steam pipeline in front of a main steam valve of a No. 1 steam turbine, and is connected with the multi-stage drainage linkage unit and the lubricating oil linkage control unit, the multi-stage drainage linkage unit is connected with the pressure monitoring and protection module, and the pressure monitoring and protection module is connected with the isolation valve assembly. The front isolation valve assembly of the main steam valve is used for cutting off steam flow; the multi-stage drainage linkage unit is used for discharging residual steam; the pressure monitoring and protection module is used for monitoring the upstream and downstream pressures of the isolation valve in real time; and the lubricating oil linkage control unit is used for controlling the start and stop of a lubricating oil system according to the isolation state.

[0006] Preferably, the front isolation valve assembly of the main steam valve comprises a manual gate valve, a valve rod sealing structure and a flange connecting component, wherein the manual gate valve is used to manually cut off or open the steam flow when needed; the valve rod sealing structure adopts a metal bellows combined with a polytetrafluoroethylene sealing to reduce the leakage amount of high-temperature and high-pressure steam passing through the valve rod; and the flange connecting component is used to ensure the sealing of the flange connection under high-temperature and high-pressure conditions, so as to prevent steam leakage from causing safety accidents.

[0007] Preferably, the metal bellows of the valve rod sealing structure has ≥5 layers, and the compensation amount is ≥3 mm; the polytetrafluoroethylene sealing ring adopts a V-shaped structure, and cooperates with a spring loading mechanism to make the valve rod leakage amount ≤5 ml / h.

[0008] Preferably, the multi-stage drainage linkage unit comprises a first-stage drainage flash tank, a second-stage pressureless water collecting funnel and a drainage pipeline temperature control valve, wherein the first-stage drainage flash tank is used to flash and depressurize the condensed water to convert high-pressure condensed water into low-pressure steam and drainage; the second-stage pressureless water collecting funnel is used to collect the drainage processed by the first-stage drainage flash tank and discharge it into a main plant house drainage system for unified treatment; and the drainage pipeline temperature control valve automatically adjusts the opening degree according to the steam superheat degree, and when the steam superheat degree decreases and the drainage is not smooth, the temperature control valve is automatically opened to ensure that the drainage is discharged in time.

[0009] Preferably, the pressure monitoring and protection module comprises a double-redundancy pressure sensor, an intelligent digital display meter and a pressure interlocking device, wherein the double-redundancy pressure sensor is used to accurately measure the upstream and downstream pressures; the intelligent digital display meter is used to display the pressure difference in real time, and when the pressure difference exceeds 0.5 MPa, an audible and light alarm is triggered to prompt the operator that the isolation valve may have a blockage abnormality; and the pressure interlocking device is used to protect the system and prevent damage due to excessively high pressure, and automatically closes the isolation valve when the upstream pressure is higher than 120% of the rated value.

[0010] Preferably, the lubricating oil linkage control unit comprises a pressure threshold comparator, a PLC controller and an AC lubricating oil pump contactor, wherein the pressure threshold comparator compares the pressure downstream of the isolation valve with a set value of 0.1 MPa, and when the downstream pressure is less than or equal to 0.1 MPa, it indicates that the system may be in a low load or shutdown state; the PLC controller is used to receive a comparison signal, and when the condition is met, the power supply of the lubricating oil pump is cut off after a delay of 15 minutes to avoid unnecessary long-time operation of the lubricating oil pump; the AC lubricating oil pump contactor is used to prevent misoperation and has a mechanical interlock to ensure the safe operation of the lubricating oil system.

[0011] Preferably, the high-pressure main steam pipe of the No. 1 steam turbine is made of 12Cr1MoVg, the pipe diameter is φ194*14, a DN175 isolation valve is selected, the material is 12Cr1MoVg, and the pipe size is φ194*14. A drain valve group is installed before the isolation valve, and the drain pipe is φ38*3.

[0012] The second aspect embodiment of the present application provides a retrofit method for the isolation valve before the main steam valve of the No. 1 steam turbine, comprising: obtaining the upstream and downstream pressure data and the steam superheat degree data of the isolation valve; processing the pressure data and the steam superheat degree data to determine whether the upstream and downstream pressure difference exceeds a preset threshold value and whether the steam superheat degree decreases; based on the determination result, performing an operation, when the pressure difference is greater than 0.5 MPa, triggering an audible and light alarm, and when the steam superheat degree decreases, automatically adjusting the opening degree of the drain pipe temperature control valve; when the pressure difference is less than or equal to 0.1 MP, cutting off the power supply of the lubricating oil pump through the PLC controller after a delay of 15 minutes; according to the operation process, generating a pressure change curve and a drain valve action record, forming an equipment operation state evaluation report, and according to the equipment operation state evaluation report, retrofitting the isolation valve before the main steam valve of the No. 1 steam turbine.

[0013] The third aspect embodiment of the present application provides an electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the retrofit method for the isolation valve before the main steam valve of the No. 1 steam turbine as described in the above embodiments.

[0014] The fourth aspect embodiment of the present application provides a computer readable storage medium having a computer program stored thereon, wherein the program is executed by a processor to implement the retrofit method for the isolation valve before the main steam valve of the No. 1 steam turbine as described in the above embodiments.

[0015] Therefore, the present application has the following beneficial effects: The steam cut-off function of the main steam valve front isolation valve assembly is used to quickly cut off the steam in the maintenance or abnormal working condition, and safety is provided for subsequent operation. The multi-stage drainage linkage unit timely and efficiently discharges residual steam, avoids the water hammer phenomenon caused by steam condensation and water accumulation, and reduces the damage risk of pipelines and equipment. The pressure monitoring and protection module dynamically monitors the pressure of the upstream and downstream of the isolation valve in real time. Once the pressure fluctuates abnormally, the protection mechanism can be triggered quickly to prevent equipment damage caused by overpressure or negative pressure. The lubricating oil linkage control unit intelligently controls the start and stop of the lubricating oil mechanism according to the working state of the isolation valve, ensures sufficient lubrication during equipment operation, reduces energy consumption when the isolation valve is closed and the equipment is shut down, and avoids the lubricating oil idling loss. The safety, stability and economy of the operation of the No. 1 steam turbine are improved, the equipment failure rate is greatly reduced, the service life of the equipment is prolonged, the energy utilization efficiency is optimized, and the operation and maintenance cost is reduced. Therefore, the problems of high misjudgment rate, slow response and poor sealing in the prior art are solved.

[0016] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the application will become apparent and be readily understood by considering the following detailed description, including the accompanying drawings, in which: Figure 1 A structural schematic diagram of a reform system of a No. 1 steam turbine main steam valve front isolation valve provided according to an embodiment of the application is shown in FIG. 1. Figure 2 A schematic diagram of a main steam valve front isolation valve assembly provided according to an embodiment of the application is shown in FIG. 2. Figure 3 A schematic diagram of a certain large-scale thermal power generation project provided according to an embodiment of the application is shown in FIG. 3. Figure 4 A schematic diagram of a multi-stage drainage linkage unit provided according to an embodiment of the application is shown in FIG. 4. Figure 5 A schematic diagram of a steam energy supply system of a certain large-scale food processing enterprise provided according to an embodiment of the application is shown in FIG. 5. Figure 6 A schematic diagram of a pressure monitoring and protection module provided according to an embodiment of the application is shown in FIG. 6. Figure 7 A schematic diagram of a lubricating oil linkage control unit provided according to an embodiment of the application is shown in FIG. 7. Figure 8 A structural schematic diagram of a reform system of a No. 1 steam turbine main steam valve front isolation valve provided according to an embodiment of the application is shown in FIG. 1. Figure 9 A schematic diagram of a No. 1 steam turbine main steam valve front isolation valve after reform provided according to an embodiment of the application is shown in FIG. 8. Figure 10 A schematic diagram of a retrofit method of a front isolation valve of a main steam valve of a No. 1 steam turbine according to an embodiment of the present application is provided. Figure 11 A schematic diagram of a night low load operation detection of a No. 1 steam turbine of a certain thermal power plant according to an embodiment of the present application is provided. Figure 12 A schematic diagram of a retrofit method of a front isolation valve of a main steam valve of a No. 1 steam turbine according to an embodiment of the present application is provided. Figure 13 A structural schematic diagram of an electronic device according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0019] A retrofit system of a front isolation valve of a main steam valve of a No. 1 steam turbine according to an embodiment of the present application is described below with reference to the drawings. In response to the problem of response lag mentioned in the background art, the present application provides a retrofit system of a front isolation valve of a main steam valve of a No. 1 steam turbine. In the system, the steam is rapidly cut off by the steam cut-off function of the front isolation valve assembly under maintenance or abnormal working conditions, providing safety protection for subsequent operations. The multi-stage drainage linkage unit timely and efficiently discharges residual steam, avoiding water hammer caused by steam condensation and water accumulation, and reducing the damage risk of pipelines and equipment. The pressure monitoring and protection module dynamically monitors the pressure of the upstream and downstream of the isolation valve in real time. Once the pressure fluctuates abnormally, the protection mechanism can be triggered quickly to prevent equipment damage caused by overpressure or negative pressure. The lubricating oil linkage control unit intelligently controls the start and stop of the lubricating oil mechanism according to the working state of the isolation valve, ensuring sufficient lubrication during equipment operation, reducing energy consumption when the isolation valve is closed and the equipment is shut down, and avoiding lubricating oil idling loss. The safety, stability and economy of the No. 1 steam turbine operation are improved, the equipment failure rate is greatly reduced, the service life of the equipment is prolonged, the energy utilization efficiency is optimized, and the operation and maintenance cost is reduced. Thus, the problems of high misjudgment rate, response lag and poor sealing in the prior art are solved.

[0020] Figure 1 A structural schematic diagram of a retrofit system of a front isolation valve of a main steam valve of a No. 1 steam turbine according to an embodiment of the present application is provided.

[0021] The retrofit system of a front isolation valve of a main steam valve of a No. 1 steam turbine according to an embodiment of the present application is provided, and the system 10 comprises: The main steam valve front isolation valve assembly 100, the multi-stage drain linkage unit 200, the pressure monitoring and protection module 300, and the lubricating oil linkage control unit 400.

[0022] The main steam valve front isolation valve assembly 100 is installed on the high-pressure main steam pipeline in front of the main steam valve of the No. 1 steam turbine, is connected with the multi-stage drain linkage unit 200 and the lubricating oil linkage control unit 400, the multi-stage drain linkage unit 200 is connected with the pressure monitoring and protection module 300, and the pressure monitoring and protection module 300 is connected with the isolation valve assembly 100. The main steam valve front isolation valve assembly 100 is used to cut off the steam flow; the multi-stage drain linkage unit 200 is used to discharge residual steam; the pressure monitoring and protection module 300 is used to monitor the upstream and downstream pressures of the isolation valve in real time; and the lubricating oil linkage control unit 400 is used to control the start and stop of the lubricating oil system according to the isolation state.

[0023] It can be understood that, in the embodiment of the present application, the steam cutting function of the main steam valve front isolation valve assembly can quickly cut off the steam in the maintenance or abnormal working conditions, thereby providing safety guarantee for subsequent operation; the multi-stage drain linkage unit can timely and efficiently discharge residual steam, thereby avoiding the water hammer phenomenon caused by steam condensation and water accumulation and reducing the damage risk of the pipeline and the equipment. The pressure monitoring and protection module can monitor the upstream and downstream pressures of the isolation valve in real time, and can quickly trigger the protection mechanism once the pressure appears abnormal fluctuation, thereby preventing the equipment damage caused by overpressure or negative pressure; the lubricating oil linkage control unit can intelligently control the start and stop of the lubricating oil mechanism according to the working state of the isolation valve, thereby ensuring the sufficient lubrication of the equipment during operation, reducing the energy consumption when the isolation valve is closed and the equipment is stopped, and avoiding the lubricating oil idle loss. The safety, stability and economy of the No. 1 steam turbine operation are improved, the equipment failure rate is greatly reduced, the service life of the equipment is prolonged, the energy utilization efficiency is optimized, and the operation and maintenance cost is reduced. Thus, the problems of high misjudgment rate, slow response and poor sealing in the prior art are solved.

[0024] In the embodiment of the present application, the main steam valve front isolation valve assembly 100 further comprises: as shown in Figure 2 a manual gate valve, a valve rod sealing structure and a flange connecting component.

[0025] The manual gate valve is used to manually cut off or open the steam flow when needed; the valve rod sealing structure adopts a metal bellows and a polytetrafluoroethylene combined sealing to reduce the leakage amount of high-temperature and high-pressure steam passing through the valve rod; and the flange connecting component is used to ensure the sealing property of the flange connection under high-temperature and high-pressure working conditions, thereby preventing the steam leakage from causing safety accidents.

[0026] It is understood that the embodiments of this application grant operators flexible control authority through manual gate valves, enabling rapid manual intervention in steam on / off in emergency or special conditions, ensuring timely and reliable control. The valve stem sealing structure adopts a combination design of metal bellows and polytetrafluoroethylene (PTFE). Leveraging the high elasticity of the metal bellows and the excellent temperature resistance, wear resistance, and low friction properties of PTFE, it resists high-temperature and high-pressure steam erosion, significantly reducing the risk of leakage at the valve stem and avoiding energy waste and safety hazards caused by steam overflow. The flange connection components, through precise structural design and material selection, maintain good sealing performance even under harsh high-temperature and high-pressure conditions, preventing steam leakage from the flange connection, comprehensively improving safety, sealing, and stability, and reducing maintenance frequency and costs.

[0027] For example, such as Figure 3 As shown, in a large-scale thermal power generation project, the steam turbine used is a supercritical, single-shaft, three-cylinder, four-exhaust condensing steam turbine with one intermediate reheat. During long-term operation, the main steam valve of this turbine faces frequent scouring by high-temperature, high-pressure steam, placing extremely high demands on the performance of the valve stem sealing structure. Its valve stem seal employs an innovative combined structure. The inner side features a multi-layer stainless steel bellows seal, utilizing the bellows' extensibility to effectively compensate for the axial displacement of the valve stem during hot operation, ensuring that steam does not leak to the external environment along the valve stem even at steam pressures up to 16 MPa. The outer side is fitted with a sealing ring filled with polytetrafluoroethylene (PTFE). This sealing ring possesses excellent self-lubricating properties and chemical stability, maintaining a good sealing effect even at steam temperatures reaching 540°C, further reducing the risk of steam leakage. Through this unique valve stem sealing structure, the steam turbine not only reduces energy loss caused by steam leakage, saving an amount of steam equivalent to 300 tons of standard coal per year, but also significantly extends the maintenance cycle of the main steam valve from twice a year to once every two years, greatly improving the stability and economy of the steam turbine operation and providing a solid guarantee for the efficient and stable operation of the entire power generation system.

[0028] In this embodiment, the valve stem sealing structure has ≥5 layers of metal bellows, a compensation amount ≥3mm, and a V-shaped polytetrafluoroethylene sealing ring with a spring loading mechanism to ensure that the valve stem leakage is ≤5ml / h.

[0029] Among them, the polytetrafluoroethylene (PTFE) sealing ring is a ring-shaped part made of PTFE. With its excellent high and low temperature resistance, corrosion resistance, self-lubrication and low coefficient of friction, it is used for sealing between mechanical parts and can achieve reliable sealing in a temperature range of -200℃ to 260℃ and in a variety of media environments.

[0030] It can be understood that the polytetrafluoroethylene sealing ring can isolate the fluid medium, can work stably in an extreme chemical environment such as strong acid and strong base, and is not afraid of medium corrosion; excellent high and low temperature resistance makes it maintain sealing properties in a temperature range of -200 DEG C to 260 DEG C, and is suitable for various temperature difference environments; good self-lubricity can reduce part friction, reduce wear and energy consumption; low permeability ensures sealing tightness, prevents leakage, reduces equipment failure frequency, reduces maintenance cost, improves equipment operation efficiency and safety, and avoids environmental pollution and resource waste caused by leakage.

[0031] In the embodiment of the application, the multi-stage hydrophobic linkage unit 200 includes: as shown in Figure 4 a first-stage hydrophobic expansion vessel, a second-stage non-pressure water collecting funnel, and a hydrophobic pipeline temperature control valve.

[0032] The first-stage hydrophobic expansion vessel is used for flash evaporation of the condensed water to convert high-pressure condensed water into low-pressure steam and hydrophobic water; the second-stage non-pressure water collecting funnel is used for collecting the hydrophobic water treated by the first-stage hydrophobic expansion vessel and discharging the hydrophobic water into a main plant hydrophobic system for unified treatment; and the hydrophobic pipeline temperature control valve automatically adjusts the opening degree according to the steam superheat degree, and when the steam superheat degree decreases and the hydrophobic water is not smooth, the temperature control valve is automatically opened to ensure that the hydrophobic water is discharged in time.

[0033] It can be understood that the first-stage hydrophobic expansion vessel flash evaporates and depressurizes the high-pressure condensed water to efficiently convert the high-pressure condensed water into low-pressure steam and hydrophobic water, greatly reducing the processing pressure of the subsequent hydrophobic system; the second-stage non-pressure water collecting funnel orderly collects the treated hydrophobic water, and seamlessly connects with the main plant hydrophobic system, thereby guaranteeing the standardization and safety of the centralized treatment of the hydrophobic water; and the hydrophobic pipeline temperature control valve intelligently dynamically adjusts the opening degree according to the sensitive perception of the steam superheat degree, increases the flow in time when the hydrophobic water is not smooth, and avoids problems such as pipeline water accumulation and cavitation. The hydrophobic efficiency is improved, the equipment failure and energy loss caused by the unsmooth hydrophobic water are reduced, the stability and reliability of the entire hydrophobic system are enhanced, the operation and maintenance cost is reduced, and the long-term efficient operation of the equipment is guaranteed.

[0034] For example, as shown in Figure 5As shown, in the steam energy supply system of a large food processing enterprise, the length of the steam pipeline is up to 3 kilometers. Due to the frequent start and stop of steam equipment required by the production process, the problem of condensate accumulation in the pipeline is very prominent. Before the installation of the steam trap temperature control valve, water hammer caused by condensate accumulation occurs 15 times a year, each maintenance takes an average of 8 hours, the direct economic loss is more than 300,000 yuan, and the production efficiency is reduced by about 12% due to the unplanned shutdown of equipment. To solve this problem, the enterprise installs a steam trap temperature control valve in the steam pipeline drainage system. The valve can monitor the superheat degree of steam in real time. When the steam superheat degree is lower than the set threshold (such as 5℃) at the initial stage of equipment start-up, the temperature control valve opens to 100% opening within 3 seconds, rapidly discharging about 200 kg of initial accumulated condensate in the pipeline to avoid water hammer; during normal operation of the equipment, if the steam superheat degree decreases due to changes in production load, the temperature control valve will accurately adjust the opening according to the temperature data fed back by the sensor to ensure that the condensate is discharged in time. After the transformation, the number of steam pipeline water hammer failures of the enterprise is reduced to 0, the stability of equipment operation is greatly improved, the steam heat transfer efficiency is increased by 18%, about 1200 tons of steam consumption is saved per year, equivalent to a cost of about 480,000 yuan, at the same time, the production efficiency returns to normal level, significantly improving the economic benefit and production continuity of the enterprise.

[0035] In the embodiment of the present application, the pressure monitoring and protection module 300 comprises: Figure 6 As shown, double-redundant pressure sensors, intelligent digital display meters and pressure interlocking devices.

[0036] Among them, the double-redundant pressure sensors are used to accurately measure the upstream and downstream pressures; the intelligent digital display meters are used to display the pressure difference in real time, and trigger an audible and visual alarm when the pressure difference exceeds 0.5 MPa, prompting the operator that the isolation valve may have a blockage abnormality; the pressure interlocking device is used to protect the system and prevent damage due to excessive pressure, and automatically closes the isolation valve when the upstream pressure is higher than 120% of the rated value.

[0037] It can be understood that the double-redundant pressure sensors in the embodiment of the present application adopt a double-measurement structure, and if a single sensor fails, the other group can still continuously and accurately measure the upstream and downstream pressures of the isolation valve, with a measurement error controlled within ±0.05 MPa, ensuring data reliability; the intelligent digital display meters present the pressure difference in real time, and have an intelligent early warning program, which triggers an audible and visual alarm as soon as the pressure difference exceeds the 0.5 MPa warning line, and transmits the abnormal information to the operator within 3 seconds, helping to promptly investigate the isolation valve blockage hidden danger; when the upstream pressure rises to 120% of the rated value, the pressure interlocking device can execute the isolation valve closing instruction within 0.5 seconds, effectively blocking the impact of excessive pressure on the system, avoiding serious accidents such as pipeline rupture and equipment damage, improving the accuracy of pressure abnormality monitoring, reducing the equipment failure rate, reducing the downtime loss and maintenance cost caused by pressure problems, and enhancing the safety and stability of system operation.

[0038] For example, in the pressure monitoring system of a high-pressure reactor at a large petrochemical company, the reactor's working pressure is typically maintained at 15 MPa, in a complex and corrosive environment. To ensure production safety and data accuracy, the company installed dual-redundant pressure sensors. One set of sensors uses a high-temperature and corrosion-resistant alloy piezoresistive sensing element, while the other set uses a ceramic capacitive sensing element. During normal operation, both sets of sensors simultaneously collect pressure data, which is then cross-validated by the data processing module. During one production process, the alloy sensing element experienced abnormal fluctuations in its measurement data due to material corrosion. The system quickly identified that the difference between the two sets of data exceeded the threshold of 0.08 MPa and immediately activated the data from the ceramic capacitive sensing element as valid data, maintaining the continuity of pressure monitoring. After using dual-redundant pressure sensors, the reliability of the company's pressure monitoring system was significantly improved, with the pressure data error rate decreasing from 6% to 0.2%. This successfully avoided the risk of reactor overpressure caused by multiple pressure monitoring failures, reducing annual production losses due to equipment failures by approximately 1.5 million yuan, and effectively ensuring stable and safe production.

[0039] In this embodiment, the lubricating oil linkage control unit 400 includes, as follows: Figure 7 As shown, the components include a pressure threshold comparator, a PLC controller, and an AC lubricating oil pump contactor.

[0040] The pressure threshold comparator compares the downstream pressure of the isolation valve with a set value of 0.1 MPa. When the downstream pressure is ≤0.1 MPa, it indicates that the system may be under low load or in a shutdown state. The PLC controller receives the comparison signal and cuts off the power to the lubricating oil pump after a 15-minute delay when the condition is met, to prevent the lubricating oil pump from running for an extended period of time unnecessarily. The AC lubricating oil pump contactor is used to prevent accidental start and has a mechanical interlock to ensure the safe operation of the lubricating oil system.

[0041] Understandably, this embodiment of the application uses a pressure threshold comparator to continuously and accurately compare the downstream pressure of the isolation valve with the 0.1MPa set value. When the pressure reaches or falls below this threshold, it quickly detects a low-load or shutdown signal in the system, achieving an accuracy rate of 99.5%. After receiving the comparison signal, the PLC controller initiates a 15-minute delay program based on preset logic, effectively preventing misjudgment and shutdown caused by instantaneous pressure fluctuations. This ensures the unit can smoothly transition under unstable operating conditions and precisely cuts off the power supply to the unnecessary lubricating oil pump, reducing unnecessary energy consumption. The AC lubricating oil pump contactor, with its mechanical interlock design, constructs a physical safety barrier, eliminating the risk of accidental start-up of the lubricating oil pump and preventing equipment damage and safety accidents caused by electrical faults. This reduces equipment malfunction rate, decreases equipment wear and maintenance costs, and extends the service life of key turbine components.

[0042] For example, in the pressure regulating system of a certain long-distance natural gas pipeline, the pipeline delivery pressure needs to be strictly maintained within the range of 8-12 MPa to ensure safe and efficient gas transmission. For this purpose, a pressure threshold comparator is deployed in the system, which compares the real-time collected pipeline pressure data with the pre-set low pressure threshold of 8 MPa and high pressure threshold of 12 MPa. When the pipeline pressure suddenly drops to 7.8 MPa due to fluctuations in gas supply, the pressure threshold comparator instantly identifies that the pressure has reached the low pressure threshold and immediately sends a signal to the control system. After receiving the signal, the control system quickly starts the standby compressor and restores the pressure to the safe range within 5 minutes; when the pressure suddenly rises to 12.5 MPa due to a sudden failure at the downstream gas utilization end, the comparator also responds quickly and triggers the emergency relief valve opening instruction, allowing the pressure to return to normal within 3 minutes. After using the pressure threshold comparator, the response time of the abnormal pressure event of the natural gas pipeline system is shortened by 60%, and the pressure overrun accident rate is reduced from an average of 8 times per year to 1 time per year, effectively ensuring the safe and stable operation of the pipeline and avoiding major safety accidents and economic losses caused by abnormal pressure, such as pipeline rupture and natural gas leakage.

[0043] In the embodiment of the present application, the No. 1 steam turbine high-pressure main steam pipeline is made of 12Cr1MoVg, with a pipe diameter of φ194*14, and a DN175 isolation valve is selected, which is made of 12Cr1MoVg and has a connecting pipe size of φ194*14. A drain valve group is installed before the isolation valve, with a drain connecting pipe of φ38*3.

[0044] It can be understood that the No. 1 steam turbine high-pressure main steam pipeline and the DN175 isolation valve in the embodiment of the present application are both made of 12Cr1MoVg, and the pipe diameter and the connecting pipe size are accurately matched (the pipeline is φ194*14, and the isolation valve connecting pipe is of the same specification). This material has excellent high-temperature strength and oxidation resistance, and can effectively resist steam erosion and thermal stress damage under the working conditions of 540℃ high temperature and 10 MPa or more pressure, ensuring the sealing and structural stability of the isolation valve and the pipeline connection, reducing the risk of leakage and safety hazards. At the same time, the drain valve group (connecting pipe φ38*3) added before the isolation valve can drain the condensate water in the pipeline in time, avoiding the impact damage of water hammer phenomenon on the pipeline and the isolation valve, effectively reducing equipment vibration and wear, prolonging equipment service life, ensuring the safe and stable operation of the No. 1 steam turbine main steam under complex working conditions, reducing maintenance frequency and maintenance cost, and improving overall operation economy and reliability.

[0045] The reconstruction system of the front isolation valve of the main steam valve of the No. 1 steam turbine provided by the embodiments of the present application can rapidly cut off steam under maintenance or abnormal conditions through the steam cut-off function of the front isolation valve assembly of the main steam valve, thereby providing safety guarantee for subsequent operation. The multi-stage drainage linkage unit timely and efficiently discharges residual steam, thereby avoiding water hammer phenomenon caused by steam condensation and reducing damage risk of pipelines and equipment. The pressure monitoring and protection module dynamically monitors the pressure of the upstream and downstream of the isolation valve in real time. Once abnormal fluctuation of the pressure occurs, the protection mechanism can be quickly triggered to prevent equipment damage caused by overpressure or negative pressure. The lubricating oil linkage control unit intelligently controls the start and stop of the lubricating oil mechanism according to the working state of the isolation valve, thereby ensuring sufficient lubrication during equipment operation, reducing energy consumption when the isolation valve is closed and the equipment is shut down, and avoiding lubricating oil idling loss. The safety, stability and economy of the operation of the No. 1 steam turbine are improved, the equipment failure rate is greatly reduced, the service life of the equipment is prolonged, the energy utilization efficiency is optimized, and the operation and maintenance cost is reduced. Thus, the problems of high misjudgment rate, delayed response and poor sealing in the prior art are solved.

[0046] The reconstruction system of the front isolation valve of the main steam valve of the No. 1 steam turbine will be described below through a specific embodiment. As shown in Figure 8 , the reconstruction system of the front isolation valve of the main steam valve of the No. 1 steam turbine comprises the following components. In the No. 1 steam turbine system of a certain thermal power plant, the main steam pipeline related manual gate valve is selected from DN175, 12Cr1MoVg material, the connecting pipe size is matched with the No. 1 steam turbine high-pressure main steam pipeline, the flange is accurately connected, and the valve is installed in the 1.8-meter straight pipe section in front of the main steam valve as shown in Figure 9 , thereby reducing fluid resistance. The valve rod adopts a combination structure of 5-layer metal bellows (compensation amount 3.5 mm) and a V-shaped polytetrafluoroethylene sealing ring, cooperates with a spring loading mechanism, and controls the valve rod leakage to be less than 4.5 ml / h under the working condition of 8.83 MPa pressure and 535 ℃ temperature, thereby ensuring sealing performance.

[0047] The first-stage drainage expansion vessel is a horizontal vessel with a volume of 2 m³, a design pressure of 10 MPa and a temperature of 550 ℃, is connected to the pipeline in the drawing, and is installed below the downstream pipeline of the isolation valve to rapidly flash and depressurize high-pressure condensed water. The second-stage pressureless water collection funnel is made of stainless steel, receives the first-stage processed drainage and discharges into the main plant for unified disposal. The intelligent electric temperature control valve has a temperature control range of 100-600 ℃ and a flow rate adjustment range of 0-50 m³ / h, automatically opens when the steam superheat degree is lower than 50 ℃, and increases the drainage flow rate to 30 m³ / h within 2 minutes to prevent poor drainage.

[0048] The double-redundant diffusion silicon pressure sensor with precision of 0.2 level and range of 0-16 MPa is installed at the upstream and downstream positions of the isolation valve in the figure to realize the redundancy backup through 4-20 mA signal transmission; the intelligent digital display table displays the pressure difference in real time, and triggers the audible and light alarm within 1 second when the pressure exceeds 0.5 MPa; the electromagnetic pressure interlocking valve automatically closes the isolation valve within 0.3 seconds when the pressure reaches 110% of the rated value (9.713 MPa), and the simulation test has a closing accuracy of 100%, thereby ensuring the safety of the system.

[0049] The high-precision voltage comparator chip compares the pressure downstream of the isolation valve with the set value of 0.1 MPa, and outputs a high-level signal when the condition is met; the Siemens S7-1200 series PLC starts a 15-minute delay program after receiving the signal, and cuts off the power supply of the lubricating oil pump when the delay is over; the CJX2 series mechanical interlocking contactor is installed in the control circuit to prevent the lubricating oil pump from being started by mistake.

[0050] When the No. 1 steam turbine is under maintenance or low load, the isolation valve is manually closed to cut off the steam, and the multi-stage drainage linkage unit (corresponding to the drainage-related pipelines and equipment in the figure) is started to handle the condensate water; the pressure monitoring and protection module monitors the pressure in real time and alarms or automatically closes the isolation valve when the pressure is abnormal; when the pressure downstream is less than or equal to 0.1 MPa, the lubricating oil linkage control unit delays for 15 minutes to shut down the lubricating oil system. After the maintenance is completed, the lubricating oil system is started, the parameters are stabilized, the isolation valve is opened, and the operation is restored, and all components work together to ensure safety and efficiency.

[0051] After the transformation, when the No. 1 steam turbine is cross-operated or under maintenance, the lubricating oil system is reduced by 2000 hours of operation per year, and 2.4 million kWh of electricity (equivalent to 800 tons of standard coal) is saved; the leakage of the main steam valve is eliminated, and the annual steam-water loss is reduced by 112,000 tons, saving water treatment costs of 350,000 yuan; the equipment maintenance cycle is reduced from 4 times per year to 2 times, and the single maintenance time is shortened by 20%; the pressure monitoring makes the abnormal monitoring accuracy of the system reach 99.9%, and the equipment failure rate is reduced by more than 70%, thereby ensuring the stable operation of the steam turbine.

[0052] In summary, the special structural design of the main steam pipeline manual gate valve in the embodiments of the present application effectively controls the leakage, reduces the steam-water loss and water treatment cost; the optimized configuration of the drainage system ensures efficient treatment of condensate water and avoids poor drainage; the high-precision pressure monitoring and intelligent control device realizes rapid response and automatic disposal in abnormal conditions, the abnormal monitoring accuracy of the system reaches 99.9%, and the equipment failure rate is reduced by more than 70%. After the transformation, the lubricating oil system is reduced by 2000 hours of operation per year, 2.4 million kWh of electricity is saved, equivalent to 800 tons of standard coal, and the leakage of the main steam valve is eliminated, reducing the annual steam-water loss by 112,000 tons; the equipment maintenance cycle is reduced from 4 times per year to 2 times, and the single maintenance time is shortened by 20%, thereby achieving the goals of energy saving and consumption reduction, prolonging the service life of the equipment, and ensuring the safe and stable operation of the steam turbine.

[0053] Secondly, the reform method of the front isolation valve of the main steam valve of the No. 1 steam turbine is described with reference to the drawings according to the embodiments of the present application.

[0054] As shown in the figure, the reform method of the front isolation valve of the main steam valve of the No. 1 steam turbine includes the following steps: Figure 10 In step S101, the upstream and downstream pressure data and the steam superheat degree data of the isolation valve are obtained.

[0055] It can be understood that, by obtaining the upstream and downstream pressure data of the isolation valve, the embodiments of the present application help the operator to master the working state of the isolation valve in real time, and judge whether the isolation valve has abnormal conditions such as blockage, leakage, etc. through pressure difference analysis, so as to avoid equipment damage or safety accidents caused by abnormal pressure; obtaining the steam superheat degree data prevents condensate accumulation from causing water hammer phenomenon, reduces the wear of pipelines and equipment, and at the same time assists in optimizing the steam use efficiency and reducing energy loss.

[0056] In step S102, the pressure data and the steam superheat degree data are processed to determine whether the upstream and downstream pressure difference exceeds the preset threshold value and whether the steam superheat degree decreases.

[0057] It can be understood that, by analyzing the upstream and downstream pressure data to calculate the pressure difference, when the pressure difference exceeds the preset threshold value of 0.5 MPa, the embodiments of the present application quickly identify that the isolation valve may have abnormal working conditions such as blockage, jamming, etc., and timely trigger an audible and light alarm to remind the operator to intervene and handle quickly, so as to avoid steam transportation interruption or pipeline damage caused by valve failure; monitoring the steam superheat degree data and determining whether it decreases, when the steam superheat degree is lower than 50℃, the drain pipeline temperature control valve adjustment mechanism can be automatically activated to increase the drain flow to 30m³ / h within 2 minutes, effectively preventing water hammer phenomenon caused by steam condensation and water accumulation, reducing the wear of pipelines and equipment. The running state is monitored dynamically in all directions, potential risks are predicted in advance, the safety, stability and reliability of system operation are improved, and the number of unplanned shutdowns and equipment maintenance costs are reduced.

[0058] In step S103, based on the judgment result, the operation is carried out, when the pressure difference is greater than 0.5 MPa, the audible and light alarm is triggered, when the steam superheat degree decreases, the opening of the drain pipeline temperature control valve is automatically adjusted; when the pressure difference is less than or equal to 0.1 MPa, the PLC controller is used to cut off the power supply of the lubricating oil pump for 15 minutes.

[0059] The lubricating oil pump power supply is an energy supply device for providing power support for the lubricating oil pump, which converts electrical energy into mechanical energy to drive the lubricating oil pump to operate, and transports lubricating oil to the bearings, transmission components and other devices of the steam turbine, etc. to play the roles of lubrication, cooling, cleaning and rust prevention, etc.

[0060] ​It is understood that in this embodiment of the application, the power supply to the lubricating oil pump is cut off after a 15-minute delay by the PLC controller. On the one hand, this avoids the lubricating oil pump from running continuously under unnecessary conditions, thereby reducing energy consumption and operating costs. On the other hand, it prevents the lubricating oil from circulating unnecessarily when the equipment is under low load or stopped, thereby reducing lubricating oil loss and oxidation, extending the service life of the lubricating oil, and reducing the mechanical wear of the lubricating oil pump, thus reducing the frequency of equipment maintenance and repair costs.

[0061] For example, such as Figure 11 As shown, during a nighttime low-load operation of the No. 1 turbine at a thermal power plant, the pressure threshold comparator detected that the downstream pressure of the isolation valve dropped to 0.08 MPa, below the set value of 0.1 MPa. The PLC controller then initiated a 15-minute delay program. After 15 minutes, the AC lubricating oil pump contactor activated, cutting off the power supply to the lubricating oil pump. During this period, the power supply to the lubricating oil pump had been stable, ensuring normal lubrication of turbine bearings and other components, preventing wear. This timely power cut-off prevented the lubricating oil pump from idling for 4 hours, reducing electricity consumption by approximately 4.8 kWh. Following this operating mode, after the upgraded system is put into use, the No. 1 turbine can reduce the lubricating oil system operating hours by 2000 hours annually, saving 2.4 million kWh of electricity, equivalent to approximately 800 tons of standard coal. Simultaneously, it reduces mechanical wear on the lubricating oil pump, reducing the equipment maintenance cycle from 4 times per year to 2 times, shortening the single maintenance time by 20%, significantly reducing maintenance costs, and achieving the dual goals of energy saving and equipment protection.

[0062] In step S104, pressure change curves and steam trap action records are generated according to the operation process, and an equipment operation status assessment report is formed. Based on the equipment operation status assessment report, the isolation valve in front of the main steam valve of No. 1 steam turbine is modified.

[0063] Among them, the pressure change curve is a graphical curve that visually presents the dynamic change of pressure value of a system or equipment over a specific period of time through coordinate axes.

[0064] It is understood that, by analyzing the trend of the curve, the embodiments of this application can intuitively determine whether the system pressure is stable and promptly detect potential problems such as abnormal pressure fluctuations and peak values ​​exceeding limits. For example, when the curve shows an abnormally steep increase or decrease, the fault point can be quickly located. By comparing the pressure change curves at different time periods, the operating performance and modification effect of components such as isolation valves and pressure monitoring and protection modules can be effectively evaluated, helping technicians to optimize equipment parameter settings. In addition, the pressure change curves can also be combined with the condensate drain valve action records to deeply analyze the correlation between pressure changes and condensate drain operations, accurately identify weak links in system operation, and provide data support for the scientific modification of the isolation valve before the No. 1 steam turbine main steam valve, thereby improving the safety, stability, and economy of system operation and reducing equipment failure rate and maintenance costs.

[0065] For example, in the daily operation monitoring of No. 1 steam turbine in a certain thermal power plant, the pressure change curve suddenly appeared abnormal. The originally smooth upstream pressure curve appeared continuous peaks at a certain period of time, and the instantaneous pressure rose from 8.8 MPa to 9.5 MPa, and the downstream pressure fluctuated violently, and the minimum dropped to 7.5 MPa. Technical personnel combined with the pressure change curve and the action record of the drain valve to analyze that it was the fault of the temperature control valve of the drain pipeline, which caused the condensate water to be unable to be discharged in time, and caused the pressure abnormality. The maintenance personnel quickly replaced the temperature control valve and re-adjusted the control parameters. After the transformation, the pressure change curve returned to smooth, the upstream and downstream pressure fluctuation range was controlled in a very small interval, the number of unplanned shutdown of the equipment was reduced by 80%, the maintenance cost caused by pressure abnormality was saved by more than 800,000 yuan per year, and the safety and stability of the steam turbine operation were greatly improved.

[0066] According to the transformation method of the isolation valve before the main steam valve of No. 1 steam turbine provided by the embodiment of the present application, the steam cut-off function of the isolation valve assembly before the main steam valve can rapidly cut off the steam under maintenance or abnormal working conditions, and provide safety guarantee for subsequent operation. The multi-stage drain linkage unit can timely and efficiently discharge residual steam, avoid water hammer phenomenon caused by steam condensation and water accumulation, and reduce the damage risk of pipelines and equipment. The pressure monitoring and protection module can perform real-time dynamic monitoring on the upstream and downstream pressures of the isolation valve. Once the pressure appears abnormal fluctuation, the protection mechanism can be quickly triggered to prevent equipment damage caused by overpressure or negative pressure. The lubricating oil linkage control unit can intelligently control the start and stop of the lubricating oil mechanism according to the working state of the isolation valve, ensure sufficient lubrication during equipment operation, reduce energy consumption when the isolation valve is closed and the equipment is shut down, and avoid lubricating oil idling loss. The safety, stability and economy of No. 1 steam turbine operation are improved, the equipment failure rate is greatly reduced, the service life of the equipment is prolonged, the energy utilization efficiency is optimized, and the operation and maintenance cost is reduced. Thus, the problems of high misjudgment rate, response lag and poor sealing in the prior art are solved.

[0067] The transformation method of the isolation valve before the main steam valve of No. 1 steam turbine will be described below through a specific embodiment, as shown in FIG. 1, which includes the following steps. Figure 12 A double-redundancy diffused silicon pressure sensor with a precision of 0.2 level and a range of 0-16 MPa is installed on the pipeline 1 meter upstream and 0.8 meters downstream of the isolation valve respectively, to collect the upstream and downstream pressure data of the isolation valve in real time. The data acquisition frequency is 10 times per second, and the data is transmitted to the data processing system through 4-20 mA signal. At the same time, a K-type thermocouple temperature sensor is installed on the downstream pipeline of the isolation valve, and the steam superheat degree is calculated combined with the flow sensor data. The temperature measurement accuracy is ±1℃, which provides a data basis for the control of the drain system.

[0068] ​The collected pressure data and steam superheat data are transmitted to an industrial data processing server (configured with an Intel Xeon E5-2620v4 processor and 32 GB of memory). The data analysis software in the server calculates the pressure difference upstream and downstream of the isolation valve in real time based on a preset algorithm, and compares it with the preset threshold of 0.5 MPa; at the same time, it judges whether the steam superheat is lower than the set value of 50°C. If the pressure difference exceeds 0.5 MPa or the steam superheat decreases, the system immediately generates the corresponding control instructions.

[0069] When the data analysis software determines that the upstream and downstream pressure difference exceeds 0.5 MPa, an alarm signal is sent to the intelligent digital display meter. The intelligent digital display meter immediately issues an audible and visual alarm, and displays the abnormal pressure difference value in red font on the screen, and pushes the alarm information to the handheld terminal of the operator and the monitoring screen in the control room through industrial Ethernet, reminding the operator to check whether the isolation valve is blocked or other abnormal conditions. If the steam superheat is detected to be reduced to below 50°C, the data processing system sends an open command to the drain pipe temperature control valve (an intelligent electric temperature control valve is selected, with a temperature control range of 100-600°C and a flow regulation range of 0-50 m³ / h). The electric actuator of the temperature control valve starts to act within 2 seconds after receiving the command, and adjusts the valve opening from the initial state to the appropriate position within 2 minutes, so that the flow of the drain pipe is increased to 30 m³ / h, and the condensed water is discharged in time to prevent water hammer phenomenon. When the pressure difference is reduced to 0.1 MPa or below, the pressure threshold comparator outputs a high level signal to the Siemens S7-1200 series PLC controller. After receiving the signal, the PLC controller starts a 15-minute delay program, and after the timing is over, sends a power-off command to the AC lubricating oil pump contactor (a CJX2 series contactor with mechanical interlocking function is selected), cuts off the power supply of the lubricating oil pump, and stops the operation of the lubricating oil system, to avoid the lubricating oil pump running for a long time in unnecessary conditions, reduce energy consumption and equipment wear.

[0070] Throughout the operation, the data processing system records pressure data collected by the pressure sensor, the action time and opening changes of the steam trap in real time, and generates pressure change curves and steam trap action records at one-minute intervals. Weekly, professional technicians use equipment health management software to comprehensively assess the equipment's operating status based on this data, combined with equipment operating parameters and historical fault records, generating a detailed equipment operating status assessment report. The assessment report includes pressure fluctuation trend analysis, steam trap action effectiveness evaluation, and lubricating oil pump start-up and shutdown rationality analysis. For example, if the report shows frequent abnormal fluctuations in the pressure change curve with weak correlation to steam trap action, it indicates a potential design flaw in the drainage system, requiring optimization of the drainage pipeline layout and steam trap selection. If unnecessary frequent starts of the lubricating oil pump are found, the pressure threshold comparator settings are adjusted or the PLC control program is optimized. Based on the improvement suggestions in the assessment report, targeted modifications are made to the isolation valve before the main steam valve of turbine No. 1 and related systems to continuously improve the safety, stability, and economy of equipment operation.

[0071] Through the implementation of the above-mentioned modification methods, the steam and water loss of No. 1 steam turbine was reduced by 90% during cross-operation or maintenance, saving approximately 350,000 yuan in water treatment costs annually; the energy consumption of the lubricating oil system was reduced by 25%, reducing operating time by approximately 2,000 hours annually and saving 2.4 million kWh of electricity, equivalent to approximately 800 tons of standard coal; the accuracy rate of equipment anomaly monitoring was improved to 99.9%, downtime due to malfunctions was reduced by 70%, the maintenance cycle was extended from 4 times per year to 2 times, and the time for each maintenance was shortened by 20%, significantly reducing maintenance costs and downtime losses, and achieving efficient and safe operation of the isolation valve system before the main steam valve of No. 1 steam turbine.

[0072] In summary, this embodiment utilizes dual redundant pressure and temperature sensors working in tandem to collect pressure and steam superheat data 10 times per second. Combined with an industrial-grade server and data analysis software, it precisely controls the system using a 0.5MPa pressure difference and 50℃ superheat threshold, increasing the accuracy of equipment anomaly monitoring to 99.9% and reducing downtime by 70%. Intelligent digital displays and multi-terminal alarm push notifications ensure second-level response to abnormal situations. The steam trap responds to commands within 2 seconds and increases the flow rate to 30m³ / h within 2 minutes, effectively preventing water hammer and ensuring system safety. The lubricating oil pump starts and stops on demand, reducing annual operating hours by 2000 hours, saving 2.4 million kWh of electricity (equivalent to 800 tons of standard coal), and reducing energy consumption by 25%. Based on minute-level data recordings of pressure change curves and equipment action records, combined with professional evaluation reports, dynamic optimization of the system is achieved, reducing steam and water loss by 90%, saving 350,000 yuan in water treatment costs annually, extending maintenance cycles, and shortening single maintenance time by 20%, significantly improving the safety, stability, and economy of equipment operation.

[0073] Figure 13 The structure schematic diagram of the electronic device provided by the embodiment of the present application is provided. The electronic device can include: The memory 1301, the processor 1302 and the computer program stored in the memory 1301 and executable on the processor 1302.

[0074] The processor 1302 implements the reforming method of the front isolation valve of the main steam valve of the No. 1 steam turbine provided in the above embodiment when executing the program.

[0075] Further, the electronic device further includes: The communication interface 1303 is used for communication between the memory 1301 and the processor 1302.

[0076] The memory 1301 is used for storing the computer program executable on the processor 1302.

[0077] The memory 1301 can include a high-speed RAM (Random Access Memory, random access memory) memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0078] If the memory 1301, the processor 1302 and the communication interface 1303 are independently implemented, the communication interface 1303, the memory 1301 and the processor 1302 can be connected to each other through a bus and complete the communication between each other. The bus can be an ISA (Industry Standard Architecture, industry standard architecture) bus, a PCI (Peripheral Component, peripheral component interconnect) bus or an EISA (Extended Industry Standard Architecture, extended industry standard architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 13 In the figure, only one thick line is used to represent, but it does not mean that there is only one bus or one type of bus.

[0079] Optionally, in specific implementation, if the memory 1301, the processor 1302 and the communication interface 1303 are integrated on a chip, the memory 1301, the processor 1302 and the communication interface 1303 can complete the communication between each other through an internal interface.

[0080] The processor 1302 can be a CPU (Central Processing Unit), or an ASIC (Application Specific Integrated Circuit), or be configured as one or more integrated circuits implementing embodiments of the application.

[0081] The embodiment of the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method for reconstructing a main steam valve front isolation valve of a 1# steam turbine.

[0082] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0083] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0084] Any process or method descriptions in flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing the specified logic functions (or steps) and / or can be implemented as computer-executable instructions. The preferred embodiments of the application include additional program instructions, which can not be explicitly identified in the description of the flow charts, and the scope of the preferred embodiments of the application includes additional implementations in which the functions described in the flow charts are performed in a different order, in substantially simultaneous fashion, or in reverse order, as will be understood by those skilled in the art.

[0085] It should be understood that portions of the application can be implemented in hardware, software, firmware, or combinations thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. As such, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or combinations thereof, can be employed: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0086] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0087] Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A retrofit system for a front isolating valve of a main steam valve of a steam turbine, characterized in that The application relates to a main steam valve front isolation valve assembly, a multi-stage drainage linkage unit, a pressure monitoring and protection module and a lubricating oil linkage control unit. The main steam valve front isolation valve assembly is used for cutting off steam flow. The multi-stage drainage linkage unit is used for discharging residual steam. The pressure monitoring and protection module is used for monitoring the upstream and downstream pressures of the isolation valve in real time. The lubricating oil linkage control unit is used for controlling the start and stop of a lubricating oil system according to the isolation state. The main steam valve front isolation valve assembly comprises a manual gate valve, a valve rod sealing structure and a flange connecting component.

2. The retrofit system for a main steam isolation valve of a steam turbine high pressure governor valve according to claim 1, characterized in that The valve rod sealing structure adopts a metal bellows and a polytetrafluoroethylene combined seal to reduce the leakage amount of high-temperature and high-pressure steam at the valve rod.

3. The retrofit system for a main steam isolation valve of a steam turbine high pressure governor valve according to claim 2, wherein The flange connecting component is used for ensuring the sealing property of the flange connecting part under high-temperature and high-pressure conditions, preventing steam leakage from causing safety accidents.

4. The retrofit system for a main steam isolation valve for a steam turbine high pressure governor valve of claim 1, wherein, The metal bellows of the valve rod sealing structure has more than 5 layers, and the compensation amount is more than 3mm.

5. The retrofit system for a main steam isolation valve of a number 1 steam turbine of claim 1, wherein, The polytetrafluoroethylene sealing ring adopts a V-shaped structure, and cooperates with a spring loading mechanism to make the valve rod leakage amount less than 5ml / h.

6. The retrofit system for a main steam isolation valve for a steam turbine high pressure governor valve of claim 1, wherein, The multi-stage drainage linkage unit comprises a first-stage drainage expansion vessel, a second-stage pressureless water collecting funnel and a drainage pipeline temperature control valve. The first-stage drainage expansion vessel is used for flash evaporation and pressure reduction of condensed water, converting high-pressure condensed water into low-pressure steam and drainage. The second-stage pressureless water collecting funnel is used for collecting the drainage treated by the first-stage drainage expansion vessel and discharging the drainage into a main plant house drainage system for unified treatment. The drainage pipeline temperature control valve automatically adjusts the opening degree according to the steam superheat degree. The pressure monitoring and protection module comprises double-redundancy pressure sensors, an intelligent digital display meter and a pressure interlocking device. The double-redundancy pressure sensors are used for accurately measuring the upstream and downstream pressures. The intelligent digital display meter is used for displaying the pressure difference in real time. When the pressure difference exceeds 0.5MPa, an audible and light alarm is triggered to prompt the operator that the isolation valve may be blocked. The pressure interlocking device is used for protecting the system from being damaged due to excessively high pressure. When the upstream pressure is higher than 120% of the rated value, the isolation valve is automatically closed. The lubricating oil linkage control unit comprises a pressure threshold comparator, a PLC controller and an alternating current lubricating oil pump contactor. The pressure threshold comparator compares the downstream pressure of the isolation valve with a set value of 0.1MPa. When the downstream pressure is less than or equal to 0.1MPa, the system may be in a low-load or shutdown state. The PLC controller is used for receiving the comparison signal. When the condition is met, the power supply of the lubricating oil pump is cut off after a delay of 15 minutes to avoid long-time operation of the lubricating oil pump under unnecessary conditions. The alternating current lubricating oil pump contactor is used for preventing misoperation and has a mechanical interlock to ensure the safe operation of the lubricating oil system.

7. The retrofit system for a main steam isolation valve for a steam turbine high pressure governor valve of claim 1, wherein, 1# steam turbine high pressure main steam pipe material 12Cr1MoVg, pipe diameter φ194*14, DN175 isolation valve is selected, material 12Cr1MoVg, pipe size φ194*14. A drain valve group is installed before the isolation valve, and the drain pipe is φ38*3.

8. A method of retrofitting a front isolation valve of a main steam valve of a steam turbine, characterized in that It comprises: acquiring pressure data and steam superheat degree data upstream and downstream of the isolation valve; processing the pressure data and steam superheat degree data, judging whether the pressure difference between the upstream and downstream exceeds a preset threshold value, and whether the steam superheat degree decreases; based on the judgment result, performing operations, when the pressure difference is greater than 0.5 MPa, triggering an audible and light alarm, when the steam superheat degree decreases, automatically adjusting the opening of the drain pipe temperature control valve, when the pressure difference is less than or equal to 0.1 MPa, cutting off the power supply of the lubricating oil pump through the PLC controller for 15 minutes; according to the operation process, generating a pressure change curve and a drain valve action record, forming a device operation state evaluation report, and according to the device operation state evaluation report, reforming the isolation valve before the main steam valve of the 1# steam turbine.

9. An electronic device, comprising: It comprises: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the reforming method of the isolation valve before the main steam valve of the 1# steam turbine according to claim 8.

10. A computer readable storage medium having stored thereon a computer program or instructions, characterized in that, The computer program or instructions are executed to implement the reforming method of the isolation valve before the main steam valve of the 1# steam turbine according to claim 8.

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