Steam turbine shaft seal air leakage recycling system

Abstract

The invention relates to the technical field of steam turbines, in particular to a steam turbine shaft seal air leakage recycling system which comprises a heat exchanger, a pressure release valve, an air guide pipe, a pressure maintaining valve, a base, a transfer tank, a steam inlet pipe and a purification assembly. A heat exchanger is arranged at the end, close to the transfer tank, of the top of the base, a pressure release valve is arranged between the output end of the side edge of the transfer tank and a steam inlet of the heat exchanger, and an air guide pipe is installed at the output end of the top of the transfer tank. A pressure stabilizing valve is installed on the air guide pipe, and the air guide pipe is communicated with a shaft seal of equipment such as a pump and a fan. According to the steam turbine shaft seal air leakage recycling system, shaft seal air leakage can be treated and recycled conveniently, and economic benefits are improved.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically to a steam turbine shaft seal leakage recovery and utilization system. Background Technology

[0002] During turbine operation, the shaft seal, as a crucial sealing structure between the rotor and cylinder, inevitably generates leaking steam. This leaking steam contains a certain amount of pressure and heat energy, typically at a pressure of 0.05–0.5 MPa and a temperature of 50–350°C. Furthermore, the working fluid is close to distilled water, possessing extremely high recycling value. Direct discharge not only results in a significant waste of working fluid and energy, but the high-temperature steam can also heat the lubricating oil in the bearing housing, leading to oil deterioration. Leaks at the low-pressure cylinder shaft seal may also allow outside air to infiltrate, reducing the condenser vacuum and affecting the unit's operating efficiency and safety.

[0003] The current mainstream method for recovering leaking steam from shaft seals in the industry is to directly heat the condensate using a shaft seal heater, utilizing the sensible heat of the leaking steam to raise the feedwater temperature and reduce boiler fuel consumption. However, this recovery model has significant technical limitations: on the one hand, it can only utilize the sensible heat of the steam, failing to effectively tap the pressure energy inherent in the steam itself, ignoring the core principle of energy cascade utilization, resulting in low energy recovery efficiency; on the other hand, the recovery method is relatively simple, only achieving preliminary recovery of the working fluid and thermal energy, and cannot reuse the purified leaking steam as a low-pressure sealing gas for shaft seals of pumps, fans, and other equipment, resulting in insufficient resource reuse and requiring the additional purchase of low-pressure sealing gas sources such as compressed air and nitrogen, increasing system operating costs and energy consumption. Summary of the Invention The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, the turbine shaft seal leakage recovery and utilization system of the present invention facilitates the treatment and recycling of shaft seal leakage, thereby improving economic efficiency.

[0005] The turbine shaft seal leakage recovery and utilization system of this invention includes: a heat exchanger, a pressure relief valve, a gas guide pipe, a pressure stabilizing valve, a base, a transfer tank, a steam inlet pipe, and a purification component. One end of the steam inlet pipe is connected to the turbine shaft seal leakage outlet, and the other end of the steam inlet pipe is connected to the purification component. The purification component includes a coarse filter, the inlet of which is connected to the outlet of the steam inlet pipe. A transfer tank is provided at one end of the top of the base, and the transfer tank is connected to the outlet of the purification component. A heat exchanger is provided at one end of the top of the base near the transfer tank. A pressure relief valve is provided between the output end on the side of the transfer tank and the steam inlet of the heat exchanger. A gas guide pipe is installed at the output end of the top of the transfer tank, and a pressure stabilizing valve is installed on the gas guide pipe. The gas guide pipe is connected to the shaft seal of equipment such as pumps and fans.

[0006] The turbine shaft seal leakage recovery and utilization system of the present invention facilitates the treatment and recovery of shaft seal leakage, thereby improving economic efficiency.

[0007] In some embodiments, the purification assembly includes a cyclone separator, a water tank, a coalescing oil separator, and a precision filter. The cyclone separator is fixed to the top of the base, and the air inlet of the cyclone separator is connected to the outlet of the coarse filter. The bottom of the cyclone separator is provided with a water tank, and the side of the cyclone separator is provided with a coalescing oil separator. The air inlet of the coalescing oil separator is connected to the exhaust end of the top of the cyclone separator, and the exhaust end of the coalescing oil separator is equipped with a precision filter. The exhaust end of the precision filter is connected to the transfer tank.

[0008] In some embodiments, the purification assembly further includes a first solenoid valve, a second solenoid valve, a level gauge, and a controller. The first solenoid valve is disposed on the steam inlet pipe, and the inlet of the second solenoid valve is connected to the bottom of the water storage tank. The controller is connected to a level gauge, which is installed on the water storage tank to monitor the water level. The controller is also connected to the first solenoid valve box to open or close the first and second solenoid valves based on the data output by the level gauge. In some embodiments, the turbine shaft seal leakage recovery and utilization system further includes a pressure monitoring component, which is disposed at the outlet of the pressure regulating valve.

[0009] In some embodiments, the turbine shaft seal leakage recovery and utilization system further includes a temperature monitoring component, which is disposed at the outlet of the pressure regulating valve.

[0010] In some embodiments, the coarse filter includes a filter box, a connector, a filter screen, and a positioning mechanism. The connector is provided on one side of the filter box, and the filter screen is slidably inserted into the connector. The positioning mechanism for positioning the filter screen is provided on the side of the filter box.

[0011] In some embodiments, the positioning mechanism includes a slide groove, a plug, a spring, a pull block, and a socket. The slide groove is formed on the side of the plug interface, and the plug is slidably disposed inside the slide groove. A spring is provided between the end of the plug away from the filter screen and the end of the slide groove. A pull block is fixed to the side of the plug, and the end of the plug extends into the interior of the plug interface. A socket that mates with the plug is formed on the side of the filter screen.

[0012] In some embodiments, the insert block has a beveled surface at one end near the filter screen, and the pull block has anti-slip texture at its end. In some embodiments, the heat exchanger is a shell-and-tube heat exchanger, with the shell side of the heat exchanger serving as a steam passage connected to a pressure relief valve, and the tube side of the heat exchanger serving as a boiler feedwater passage, with the boiler feedwater inlet and boiler feedwater outlet at its two ends, respectively.

[0013] In some embodiments, the coalescing oil separator is provided with oleophilic and hydrophobic coalescing packing inside, and the bottom of the coalescing oil separator is provided with an oil drain port for discharging the separated oil sludge. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a steam turbine shaft seal leakage recovery and utilization system.

[0015] Figure 2 This is a schematic diagram of a coarse filter according to an embodiment of the present invention.

[0016] Figure 3 This is a schematic diagram of the exploded structure of the coarse filter according to an embodiment of the present invention.

[0017] Figure label: 1. Base, 2. Cyclone separator, 3. Water tank, 4. Coarse filter, 4. Filter box, 401. Socket, 402. Filter screen, 403. Slide, 404. Insert block, 405. Spring, 406. Pull block, 407. Socket, 408. Steam inlet pipe, 5. Coalescing oil separator, 6. Precision filter, 7. Transfer tank, 8. Heat exchanger, 9. Pressure relief valve, 10. Air guide pipe, 11. Pressure regulating valve, 12. Temperature monitoring component, 13. Pressure monitoring component, 14. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] The turbine shaft seal leakage recovery and utilization system of this invention includes: a transfer tank 8, a base 1, a heat exchanger 9, a gas guide pipe 11, a pressure regulating valve 12, a pressure relief valve 10, a steam inlet pipe 5, and a purification component. One end of the steam inlet pipe 5 is connected to the turbine shaft seal leakage outlet, and the other end of the steam inlet pipe 5 is connected to the purification component, which includes a coarse filter 4. The inlet of the coarse filter 4 is connected to the outlet of the steam inlet pipe 5. A transfer tank 8 is provided at one end of the top of the base 1. The transfer tank 8 is connected to the discharge port of the purification component. A heat exchanger 9 is installed at the top of the base 1 near the transfer tank 8. A pressure relief valve 10 is installed between the output end of the transfer tank 8 on its side and the steam inlet of the heat exchanger 9. A gas duct 11 is installed at the output end of the top of the transfer tank 8. A pressure stabilizing valve 12 is installed on the gas duct 11. The gas duct 11 is connected to the shaft seal of equipment such as pumps and fans.

[0020] The turbine shaft seal leakage recovery and utilization system of the present invention facilitates the treatment and recovery of shaft seal leakage, thereby improving economic efficiency.

[0021] Leaking steam from the turbine shaft seal enters the device through steam inlet pipe 5. It first flows through a purification component for preliminary treatment of impurities and oil, removing most solid particles and oil mist. The clean steam then enters the transfer tank 8 for buffering and pressure stabilization. The vent pipe 11 at the top of the transfer tank 8 serves as a sealing gas supply channel. The pressure stabilizing valve 12 is pre-set to match the working pressure of the shaft seals of pumps, fans, and other equipment. When the steam pressure in the transfer tank 8 reaches the set value, the pressure stabilizing valve 12 automatically opens, and steam is stably delivered to the shaft seals of each piece of equipment via the vent pipe 11, achieving a substitute supply of low-pressure sealing gas. If the steam pressure in the transfer tank 8 exceeds the set value of the pressure stabilizing valve 12, the pressure relief valve 10 automatically activates, introducing the overpressure steam into the heat exchanger 9. The steam flows in the shell side of the heat exchanger 9, exchanging heat with the boiler feedwater in the tube side. After releasing heat energy to preheat the feedwater, the steam condenses into condensate for further recovery, ultimately achieving the initial cascade utilization of the leaking steam pressure and heat energy. The base 1 provides stable support for the entire device, ensuring the coordinated operation of all components.

[0022] Leaking steam first enters the coarse filter 4 in the purification component through the steam inlet pipe 5. The purification component can specifically remove solid impurities and some oil mist and other pollutants from the shaft seal leakage steam to ensure that the steam cleanliness meets the sealing gas source standard and is convenient for subsequent equipment use.

[0023] The purification component of this invention, consisting of a coarse filter 4, a coalescing oil separator 6, and a precision filter 7, can specifically remove solid impurities, oil mist, and other contaminants from the leaking steam of the shaft seal, ensuring that the steam cleanliness meets the sealing gas source standards and laying a core foundation for subsequent reuse. The purified steam first enters the transfer tank 8 for buffering, and then the pressure is controlled by the air guide pipe 11 and the pressure regulating valve 12 to stably supply the shaft seals of equipment such as pumps and fans. This effectively replaces externally purchased compressed air, nitrogen, and other sealing gas sources, reducing the procurement cost of external gas sources and the operating energy consumption of supporting equipment such as air compressors and nitrogen generators. At the same time, for steam with excessive pressure, it is guided to the heat exchanger 9 through the pressure relief valve 10 to preheat the boiler feedwater. The pressure energy of the steam is used for sealing, while the heat energy is used to preheat the boiler feedwater or to exchange heat with the heating hot water to heat the heating hot water. This cascaded energy extraction avoids the energy waste of the traditional single heating mode and realizes multiple reuse of the steam working fluid, greatly improving the system's operational flexibility and economy, and reducing the overall energy consumption of the unit.

[0024] In some embodiments, the purification assembly includes a cyclone separator 2, a water tank 3, a coalescing oil separator 6, and a precision filter 7. The cyclone separator 2 is fixed to the top of the base 1. The air inlet of the cyclone separator 2 is connected to the outlet of the coarse filter 4. The water tank 3 is provided at the bottom of the cyclone separator 2. The coalescing oil separator 6 is provided on the side of the cyclone separator 2. The air inlet of the coalescing oil separator 6 is connected to the exhaust end at the top of the cyclone separator 2. The precision filter 7 is installed at the exhaust end of the coalescing oil separator 6. The exhaust end of the precision filter 7 is connected to the transfer tank 8.

[0025] Specifically, leaked steam first enters the coarse filter 4 through the steam inlet pipe 5. The pre-filtered steam then enters the cyclone separator 2, where centrifugal force separates the condensate carried in the steam. The condensate flows along the inner wall of the cyclone separator 2 to the bottom water tank 3 for collection, facilitating subsequent recycling and reuse. The steam after condensate separation enters the coalescing oil separator 6 from the top exhaust end of the cyclone separator 2 for deep oil removal. The oil-removed steam then passes through the precision filter 7 for fine filtration, removing residual micro-impurities and oil mist particles to ensure the steam cleanliness meets the requirements of the sealed air source. The coarse filter 4 can filter larger solid particles, while the fine filter can filter smaller particles to remove residual micro-impurities and oil mist.

[0026] Steam first flows through coarse filter 4 to initially intercept larger particulate impurities. Then, steam enters cyclone separator 2, where centrifugal separation is used to separate condensate from the steam. The condensate is collected in water tank 3 to prevent liquid water from affecting subsequent oil removal and sealing.

[0027] After condensation separation, the steam enters the coalescing oil separator 6, where the internal oleophilic and hydrophobic coalescing packing captures oil mist particles in the steam. The coalesced oil is discharged from the bottom oil outlet, achieving oil-vapor separation. Next, the steam passes through a precision filter 7 to remove residual micro-impurities and oil mist, ensuring the steam cleanliness meets the equipment's shaft seal sealing standards. The purified clean steam then enters a transfer tank 8 for buffering. A pressure gauge at the top of the transfer tank 8 monitors the internal pressure in real time, providing a basis for pressure regulation.

[0028] When the steam pressure in the transfer tank 8 meets the equipment shaft seal requirements, the pressure regulating valve 12 opens, and the steam is accurately delivered to the shaft seal of the pump, fan and other equipment through the air guide pipe 11 for sealing, replacing the externally purchased sealing air source to achieve the sealing function; if the steam pressure exceeds the set value of the pressure regulating valve 12, the pressure relief valve 10 opens automatically, and the overpressure steam is introduced into the shell side of the heat exchanger 9 to exchange heat with the boiler feedwater flowing in the tube side of the heat exchanger 9. The steam releases heat energy to preheat the feedwater and reduce the boiler heating load. The steam condensate after heat exchange can be recycled to the turbine regenerative system together with the condensate collected in the water storage tank 3 to achieve working fluid reuse.

[0029] After condensation separation, the steam enters the coalescing oil separator 6, where the internal oleophilic and hydrophobic coalescing packing captures oil mist particles in the steam. The coalesced oil is discharged from the bottom oil outlet, achieving oil-vapor separation. Next, the steam passes through a precision filter 7 to remove residual micro-impurities and oil mist, ensuring the steam cleanliness meets the equipment's shaft seal sealing standards. The purified clean steam then enters a transfer tank 8 for buffering. A pressure gauge at the top of the transfer tank 8 monitors the internal pressure in real time, providing a basis for pressure regulation.

[0030] In some embodiments, the purification assembly further includes a first solenoid valve, a second solenoid valve, a level gauge, and a controller. The first solenoid valve is disposed on the steam inlet pipe 5, and the inlet of the second solenoid valve is connected to the bottom of the water storage tank 3. The controller is connected to the level gauge, which is installed on the water storage tank 3 to monitor the level of the water in the water storage tank 3. The controller is also connected to the first solenoid valve box to open or close the first solenoid valve and the second solenoid valve according to the output data of the level gauge.

[0031] Specifically, the controller is connected to a level gauge to monitor the liquid level in the water storage tank 3. When the liquid level is sufficient, some water needs to be drained from the tank. At this time, the controller controls the first solenoid valve to close the steam inlet pipe 5 and the second solenoid valve to open, thus draining the water from the tank and stopping the system. When the level gauge detects a sufficiently low liquid level, the controller controls the first solenoid valve to open the steam inlet pipe 5 and close the second solenoid valve, thus restarting the system. In some embodiments, the turbine shaft seal leakage recovery and utilization system further includes a pressure monitoring component 14, which is located at the outlet of the pressure regulating valve 12 to measure the actual pressure after the pressure regulating valve 12, providing data for operators or automated control systems, thereby facilitating verification, fine-tuning or even correction of the valve opening, and ensuring that the pressure of the recovered steam is accurately maintained within the set range.

[0032] In some embodiments, the turbine shaft seal leakage recovery and utilization system further includes a temperature monitoring component 13, which is located at the outlet of the pressure regulating valve 12.

[0033] In some embodiments, the coarse filter 4 includes a filter box 401, an insertion interface 402, a filter screen 403, and a positioning mechanism. The insertion interface 402 is provided on one side of the filter box 401, and the filter screen 403 is slidably inserted into the insertion interface 402. The side of the filter box 401 is provided with a positioning mechanism for positioning the filter screen 403.

[0034] In some embodiments, the positioning mechanism includes a slide groove 404, a plug 405, a spring 406, a pull block 407, and a socket 408. The slide groove 404 is formed on the side of the insertion interface 402. The plug 405 is slidably disposed inside the slide groove 404. A spring 406 is provided between the end of the plug 405 away from the filter screen 403 and the end of the slide groove 404. A pull block 407 is fixed to the side of the plug 405. The end of the plug 405 extends into the interior of the insertion interface 402. A socket 408 that mates with the plug 405 is formed on the side of the filter screen 403.

[0035] Specifically, the filter box 401 provides a cavity for filtration. Steam passes through the filter screen 403 inside the insertion port 402. The filter screen 403 intercepts larger solid impurities in the steam, achieving preliminary filtration. The filter screen 403 is installed using a plug-in method and is quickly positioned using a positioning mechanism. The insertion block 405 is embedded into the insertion hole 408 of the filter screen 403 under the elastic force of the spring 406, firmly fixing the filter screen 403 in the filter box 401 and preventing the filter screen 403 from shifting due to steam impact. When the filter screen 403 needs to be replaced, the operator pulls the pull block 407. The pull block 407 drives the insertion block 405 to slide along the slide groove 404 and compress the spring 406, causing the insertion block 405 to disengage from the insertion hole 408. The filter screen 403 can then be pulled out from the insertion port 402. After replacement, the operation is reversed to complete the installation.

[0036] Steam leaking from the turbine shaft seal first enters the device through steam inlet pipe 5. Base 1 provides a stable mounting foundation for all components, ensuring structural stability during operation. The steam first flows through coarse filter 4, where large particles are initially intercepted by filter screen 403. The positioning mechanism, through the cooperation of insert block 405 and spring 406, reliably fixes and facilitates easy disassembly and assembly of filter screen 403. Subsequently, the steam enters cyclone separator 2, where centrifugal separation separates condensate from the steam. The condensate is collected in water storage tank 3 to prevent liquid water from affecting subsequent oil removal and sealing effects.

[0037] This embodiment uses a coarse filter 4 composed of a filter box 401, a plug-in interface 402, a filter screen 403, a slide 404, a plug block 405, a spring 406, a pull block 407, and a plug hole 408. The filter screen 403 is installed and fixed through a plug-in structure. During disassembly and assembly, only the pull block 407 needs to be operated to drive the plug block 405 to compress the spring 406, which can quickly complete the removal and replacement of the filter screen 403 without complicated disassembly procedures. This design significantly shortens the maintenance and replacement time of the filter screen 403, reduces the operation difficulty for maintenance personnel, and has higher practicality.

[0038] Furthermore, the insertion block 405 has a beveled surface at one end near the filter screen 403, and the end of the pull block 407 has anti-slip texture to guide the filter screen 403 to be inserted smoothly. The anti-slip texture at the end of the pull block 407 also improves the ease of operation.

[0039] Furthermore, the heat exchanger 9 is a shell-and-tube heat exchanger 9. The shell side of the heat exchanger 9 is a steam passage that is connected to the pressure relief valve 10, and the tube side of the heat exchanger 9 is a boiler feedwater passage with the boiler feedwater inlet and boiler feedwater outlet at its two ends, respectively.

[0040] Furthermore, the coalescing oil separator 6 is internally equipped with oleophilic and hydrophobic coalescing packing, and the bottom of the coalescing oil separator 6 is provided with an oil drain port for discharging the separated oil sludge. In the description of this invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A turbine shaft seal leakage recovery and utilization system, characterized in that, include: The system includes a base, a steam inlet pipe, and a purification assembly. One end of the steam inlet pipe is connected to the turbine shaft seal leakage outlet, and the other end of the steam inlet pipe is connected to the purification assembly, which includes a coarse filter. The inlet of the coarse filter is connected to the outlet of the steam inlet pipe. The transfer tank is located at one end of the top of the base and is connected to the outlet of the purification component. A heat exchanger and a pressure relief valve are provided. The heat exchanger is located at the top of the base near the transfer tank. A pressure relief valve is located between the output end of the transfer tank on the side and the steam inlet of the heat exchanger. The gas duct and pressure stabilizing valve are installed at the output end of the top of the transfer tank. The gas duct is connected to the shaft seal of equipment such as pumps and fans.

2. The turbine shaft seal leakage recovery and utilization system according to claim 1, characterized in that, The purification assembly includes a cyclone separator, a water tank, a coalescing oil separator, and a precision filter. The cyclone separator is fixed to the top of the base. The air inlet of the cyclone separator is connected to the outlet of the coarse filter. The water tank is located at the bottom of the cyclone separator. The coalescing oil separator is located on the side of the cyclone separator. The air inlet of the coalescing oil separator is connected to the exhaust end at the top of the cyclone separator. A precision filter is installed at the exhaust end of the coalescing oil separator. The exhaust end of the precision filter is connected to the transfer tank.

3. The turbine shaft seal leakage recovery and utilization system according to claim 2, characterized in that, The purification assembly also includes a first solenoid valve, a second solenoid valve, a level gauge, and a controller. The first solenoid valve is mounted on the steam inlet pipe, and the inlet of the second solenoid valve is connected to the bottom of the water storage tank. The controller is connected to a level gauge, which is installed on the water storage tank to monitor the water level in the tank. The controller is also connected to the first solenoid valve box to open or close the first and second solenoid valves based on the data output by the level gauge.

4. The turbine shaft seal leakage recovery and utilization system according to claim 2, characterized in that, It also includes a pressure monitoring component, which is located at the outlet of the pressure regulating valve.

5. The turbine shaft seal leakage recovery and utilization system according to claim 2, characterized in that, It also includes a temperature monitoring component, which is disposed at the outlet of the pressure regulating valve.

6. The turbine shaft seal leakage recovery and utilization system according to claim 1, characterized in that, The coarse filter includes a filter box, a connector, a filter screen, and a positioning mechanism. The connector is located on one side of the filter box, and the filter screen is slidably inserted into the connector. The positioning mechanism for positioning the filter screen is located on the side of the filter box.

7. The turbine shaft seal leakage recovery and utilization system according to claim 6, characterized in that, The positioning mechanism includes a slide groove, a plug, a spring, a pull block, and a socket. The slide groove is opened on the side of the plug interface. The plug is slidably arranged inside the slide groove. A spring is provided between the end of the plug away from the filter screen and the end of the slide groove. A pull block is fixed on the side of the plug. The end of the plug extends into the interior of the plug interface. A socket that mates with the plug is opened on the side of the filter screen.

8. The turbine shaft seal leakage recovery and utilization system according to claim 7, characterized in that, The insert block has a beveled surface at one end near the filter screen, and the pull block has anti-slip texture at the end.

9. The turbine shaft seal leakage recovery and utilization system according to claim 1, characterized in that, The heat exchanger is a shell-and-tube heat exchanger. The shell side of the heat exchanger is a steam passage that is connected to a pressure relief valve, and the tube side of the heat exchanger is a boiler feedwater passage with the boiler feedwater inlet and boiler feedwater outlet at its two ends, respectively.

10. The turbine shaft seal leakage recovery and utilization system according to any one of claims 2-9, characterized in that, The coalescing oil separator has an oleophilic and hydrophobic coalescing packing inside, and an oil drain port at the bottom for discharging the separated oil.

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