A steam seal regulating system for a steam turbine

Abstract

The application discloses a steam seal adjusting system of a steam turbine, and belongs to the field of steam seal equipment of steam turbines. The steam seal adjusting system comprises a gas supply system and a pressure stabilizing system. The gas supply system is communicated with the pressure stabilizing system, and the pressure stabilizing system is provided with a throttle orifice plate on the side close to the gas supply system. The gas supply system is used for providing a suitable gas source for the steam seal adjusting system. The temperature and gas pressure of the gas source in the pressure stabilizing system are mainly adjusted to meet the steam seal gas supply requirement and maintain the self-sealing system pressure. The throttle orifice plate between the gas supply system and the pressure stabilizing system can keep the minimum warm pipe flow of steam in the gas supply main pipe. The steam in the gas supply system passes through the throttle orifice plate and then enters the pressure stabilizing system. By using the throttling effect of the throttle orifice plate, on one hand, the steam in the pressure stabilizing system cannot be naturally cooled, and the steam can quickly provide a suitable gas source for the unit at any time; on the other hand, the waste of steam is avoided, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to a steam seal regulation system, and more specifically, to a steam seal regulation system for a steam turbine. Background Technology

[0002] Steam turbine seal regulation refers to the control and regulation of the steam turbine's seal system to ensure the normal operation and sealing effect of the seals. The seals play an important role in the steam turbine, preventing steam leakage, maintaining system pressure balance, and protecting bearings and other critical components from corrosion and damage. However, in existing steam seal regulation systems, if the steam in the pipeline is not used or flows for a long time, it will cool down naturally, causing the system to fail to reach the required steam seal supply temperature even when it needs to operate.

[0003] For example, Chinese Patent Publication No. CN103195521A, published on July 10, 2013, entitled "Dual-Turbine Regenerative Extraction Steam Thermal System," discloses a steam seal regulation system for two steam turbines, including a large steam turbine, a small steam turbine, and a regenerative circulation unit. The regenerative circulation unit includes one or more high-pressure heaters and two deaerators. This solution can improve the flow efficiency of the large steam turbine and ensure that the small steam turbine can obtain sufficient flow and power. However, when it is in standby mode, the steam in the system is not used for a long time and cools down naturally. When the system needs to run, it cannot meet the steam seal supply temperature requirements in time. Summary of the Invention

[0004] This invention overcomes the problem of steam naturally cooling down during prolonged periods of non-use in existing steam turbine sealing systems, and provides a steam turbine sealing regulation system. This system can provide a minimum steam warm-up flow rate during normal unit operation to meet the requirements of steam sealing gas supply parameters under various unit operating conditions. In addition, it can quickly reduce the temperature in the equalization box, achieving rapid temperature regulation to meet the gas supply needs of the steam sealing system more quickly.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a steam turbine sealing regulation system, comprising a gas supply system and a pressure stabilizing system, wherein the gas supply system is connected to the pressure stabilizing system, and the pressure stabilizing system is provided with a throttling orifice plate on the side closer to the gas supply system. The gas supply system is used to provide a suitable gas source for the steam turbine sealing regulation system. The pressure stabilizing system mainly regulates the temperature and pressure of the gas source to meet the steam turbine sealing gas supply requirements and maintain the self-sealing system pressure. The throttling orifice plate between the gas supply system and the pressure stabilizing system can maintain the minimum warm-up flow rate of steam in the gas supply header. When the unit is operating normally or in the open state, the steam in the gas supply system will pass through the throttling orifice plate and then enter the pressure stabilizing system. Utilizing the throttling effect of the throttling orifice plate, on the one hand, it ensures that the steam in the pressure stabilizing system does not cool down naturally, and can quickly provide a suitable gas source for the unit at any time; on the other hand, it also avoids steam waste and reduces energy consumption.

[0006] Preferably, the gas supply system includes a main steam supply system and an auxiliary steam supply system. The main steam supply system includes a main steam pipeline, and at least one first valve is installed on the main steam pipeline. During turbine startup or low-load operation, the steam seal gas is supplied by the main steam supply system, which sprays water into the pressure stabilizing system through a high-temperature water spray desuperheating component to meet the steam seal gas supply requirements. If the power plant has a suitable auxiliary gas source, the auxiliary steam supply system can also provide the gas source; either of the two suitable gas sources can be used. The main steam supply system includes a main steam pipeline for steam flow, and at least one first valve is installed on the main steam pipeline to control the supply of main steam. Having two or more first valves can prevent the inability to properly control the flow of steam due to a failed first valve.

[0007] Preferably, the auxiliary steam supply system includes a first branch and a second branch connected in parallel. The first branch is equipped with a first electric valve, and the second branch is equipped with a second valve. Both the first and second auxiliary steam branches are used for the flow of auxiliary steam. Under normal operating conditions, only the first branch is used for auxiliary steam flow, while the second branch is not used normally. The first electric valve on the first branch is mainly used to control the flow of auxiliary steam. When the first electric valve malfunctions and requires maintenance, but the auxiliary steam supply cannot be interrupted, the second valve on the second branch can be opened to supply auxiliary steam to the steam sealing system through the second branch. It is worth noting that a shut-off valve can be installed on each side of the first electric valve. Closing the shut-off valves on both sides of the first electric valve allows for maintenance of the first electric valve without worrying about steam leakage in the first branch.

[0008] Preferably, a cooling system is also included, comprising a high-pressure water spray cooling system and a low-pressure water spray cooling system. The pressure stabilizing system includes a pressure equalization box. The side of the pressure equalization box closest to the gas supply system is connected to the high-pressure water spray cooling system via a first nozzle, and the side of the pressure equalization box furthest from the gas supply system is connected to the low-pressure water spray cooling system via a second nozzle. The high-pressure water spray cooling system mainly sprays water into the pressure equalization box to meet the gas supply requirements of the steam seal and maintain the pressure of the self-sealing system. The low-pressure water spray cooling system mainly maintains the low-pressure shaft seal gas supply temperature, automatically keeping the low-pressure steam seal gas supply temperature below 200°C.

[0009] Preferably, an overflow device is also included, comprising a third branch and a fourth branch connected in parallel. The third branch is equipped with a second electric valve, and the fourth branch is equipped with a third valve. The overflow device is mainly used to overflow excess steam from the equalizing tank to the condenser, condensing the steam into water and maintaining normal steam pressure within the equalizing tank. The second electric valve is mainly used to open and close the overflow device. When the overflow device is in operation, opening the second electric valve allows excess steam to enter the overflow device and then the condenser, reducing the steam pressure inside the equalizing tank. Similarly, the third valve on the fourth branch is normally not open; it is only used temporarily when the second electric valve malfunctions and requires maintenance.

[0010] Preferably, the pressure stabilizing system has a steam output system on the side away from the gas supply system. The steam output system includes a first output pipe and a second output pipe connected in parallel to the pressure stabilizing system and respectively connected to the front steam seal and the rear steam seal of the turbine. The steam output system provides steam to the front and rear steam seals of the turbine through the first and second output pipes, preventing steam leakage at the front and rear shaft ends of the turbine, maintaining the unit's vacuum, saving energy consumption, and effectively preventing water ingress at the front and rear ends of the turbine.

[0011] Preferably, the high-pressure water spray desuperheating system includes a fifth branch and a sixth branch connected in parallel. The fifth and sixth branches are respectively connected to both ends of the first nozzle via flanges, and each branch is equipped with at least one shut-off valve. The fifth and sixth branches are high-pressure water pipes that introduce high-pressure water into the first nozzle. The water sprayed from the first nozzle regulates the temperature of the steam in the equalization tank. The opening and closing of the shut-off valves controls the flow of the fifth and sixth branches, thereby controlling the operation of the high-pressure water spray desuperheating system.

[0012] Preferably, the first nozzle includes symmetrically arranged nozzle seats, each with a spray pipe. Each spray pipe includes a fixed portion and a nozzle opening portion. The nozzle opening portion is located on the side wall of the spray pipe and has several nozzles facing the pressure stabilizing system. The symmetrically arranged nozzle seats correspond to the fifth and sixth branches, respectively, and the nozzles are of a narrow diameter, enabling the high-pressure water to be sprayed out in the form of a water mist. This maximizes the cooling effect of the water mist, rapidly reducing the temperature within the pressure equalization chamber and achieving rapid temperature regulation to more quickly meet the gas supply requirements of the steam sealing system.

[0013] Preferably, the fixing part is slidably connected to the nozzle seat along the nozzle seat axially, and a bushing is sleeved on the outside of the spray pipe. The bushing is fixed relative to the nozzle seat, and an elastic element is provided between the fixing part and the bushing. The spray pipe can slide axially relative to the nozzle seat. When the spray pipe slides on the nozzle seat, the number of nozzles exposed outside the bushing can be controlled, thereby controlling the amount of water sprayed from the nozzles and further controlling the temperature regulation efficiency in the pressure equalization box. When rapid cooling is required, the water pressure entering the first nozzle is increased. This increased pressure causes the fixed part of the nozzle to slide within the nozzle seat, exposing the nozzles on the nozzle sidewall to the bushing, increasing the number of effective nozzles and thus increasing the water flow rate to quickly lower the temperature within the equalization chamber. Once the temperature is lowered and controlled, the water pressure entering the first nozzle is reduced. This reduced pressure causes the nozzle to reset under the action of the elastic element, resealing some nozzles within the bushing, decreasing the number of effective nozzles and thus reducing the water flow rate to achieve temperature stabilization or heating. These operations allow for rapid adjustment of the temperature and pressure within the equalization chamber to quickly meet the needs of different gas sources supplying the turbine.

[0014] Preferably, the nozzle has an internal thread structure. With an internal thread, when water flows through the nozzle, the water encounters resistance within the thread, and simultaneously, the water exerts a reaction force on the thread, causing the nozzle to rotate. This allows the nozzle to rotate circumferentially around the nozzle, achieving a rotating water spraying effect. This spraying of water mist towards the pressure equalization box and the air supply system results in a more uniform temperature drop and a larger cooling area.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) It can prevent the steam in the pipeline from being unused and not flowing for a long time and naturally cooling down, and can quickly reach the steam seal gas supply temperature requirements; (2) It can effectively prevent steam leakage at the front and rear ends of the turbine, maintain the vacuum of the unit and save energy; (3) It has better sealing performance, can effectively prevent water from entering the front and rear shaft ends of the turbine, avoid water from entering the lubricating oil, and prevent the oil from emulsifying and endangering the safe operation of the turbine; (4) It can quickly realize the temperature adjustment in the equalization box and adapt to the requirements of different gas supply parameters. Attached Figure Description

[0016] Figure 1 This is a partial structural schematic diagram of the main view of the present invention.

[0017] Figure 2 This is a schematic diagram of the gas supply system of the present invention.

[0018] Figure 3 This is a partial structural schematic diagram of the top view of the present invention.

[0019] Figure 4 for Figure 3 Schematic diagram of overflow device in direction A.

[0020] Figure 5 This is a schematic diagram of the first nozzle in Embodiment 2 of the present invention.

[0021] Figure 6 for Figure 5 A magnified view of B in the middle.

[0022] Figure 7 for Figure 5 A magnified view of C.

[0023] Figure 8 This is a schematic diagram of Example 3.

[0024] In the diagram: 1. Steam supply system, 2. Pressure stabilizing system, 3. Orifice plate, 4. Main steam supply system, 5. Auxiliary steam supply system, 6. Main steam pipeline, 7. First valve, 8. First branch, 9. Second branch, 10. Second electric valve, 11. Second valve, 12. Cooling system, 13. High-pressure water spray desuperheating system, 14. Low-pressure water spray desuperheating system, 15. Equalizing box, 16. First nozzle, 17. Second nozzle, 18. Overflow device, 19. Third branch. 20. Fourth branch, 21. Second electric valve, 22. Third valve, 23. First output pipe, 24. Second output pipe, 25. Fifth branch, 26. Sixth branch, 27. Flange, 28. Shut-off valve, 29. Nozzle seat, 30. Nozzle pipe, 31. Fixing part, 32. Nozzle part, 33. Nozzle, 34. Bushing, 35. Elastic element, 36. Internal thread, 37. First instrument assembly, 38. Second instrument assembly, 39. Filter, 40. Shut-off valve. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] Example 1: As Figures 1 to 4The steam turbine sealing regulation system shown includes a steam supply system 1, a pressure stabilizing system 2, and a cooling system 12. The steam supply system 1 is connected to the pressure stabilizing system 2, and the cooling system 12 is also connected to the pressure stabilizing system 2. The pressure stabilizing system 2 is mainly a pressure equalization box 15 structure. The steam supply system 1 includes a main steam supply system 4 and an auxiliary steam supply system 5. A throttling orifice plate 3 is installed between the steam supply system 1 and the pressure stabilizing system 2, and the throttling orifice plate 3 is located at the end of the pressure stabilizing system 2 closer to the steam supply system 1. The steam in the main steam supply system 4 and the auxiliary steam supply system 5 will enter the pressure stabilizing system 2 through the throttling orifice plate 3. By utilizing the throttling effect of the throttling orifice plate 3, the throttling orifice plate 3 can maintain the minimum warm-up flow of steam in the steam supply header. On the one hand, this ensures that the steam in the pressure stabilizing system 2 will not cool down naturally, and can quickly provide a suitable steam source for the unit at any time. On the other hand, it also avoids steam waste and reduces energy consumption.

[0027] The main steam supply system 4 includes a main steam pipeline 6, on which two first valves 7 are installed. When the steam turbine is started or when the steam turbine is at a low load, the steam seal regulating system is supplied with air by the main steam supply system 4. The first valves 7 are used to control the opening and closing of the main steam supply system 4. Two first valves 7 are provided to prevent leakage caused by valve failure. The auxiliary steam supply system 5 includes a first branch 8 and a second branch 9, which are connected in parallel. The first branch 8 is equipped with a first electric valve 10 and two shut-off valves 40, located on either side of the first electric valve 10. The second branch 9 is equipped with a second valve 11. Both the first and second branches 8 and 9 are used for the flow of auxiliary steam. Under normal operating conditions, only the first branch 8 is used for auxiliary steam flow; the second branch 9 is not used normally. The first electric valve 10 on the first branch 8 is mainly used to control the flow of auxiliary steam. When the first electric valve 10 malfunctions and requires maintenance, but the auxiliary steam supply cannot be interrupted, the second valve 11 on the second branch 9 can be opened to supply auxiliary steam to the steam sealing system through the second branch 9. It is worth noting that a shut-off valve 40 is installed on each side of the first electric valve 10. Closing the shut-off valves 40 on both sides of the first electric valve 10 allows for maintenance of the first electric valve 10 without worrying about steam leakage from the first branch 8.

[0028] The cooling system 12 includes a high-pressure water spray cooling system 13 and a low-pressure water spray cooling system 14. The high-pressure water spray cooling system 13 is connected to the equalization box 15 of the pressure stabilizing system 2, and the connection point is close to the side of the gas supply system 1. A first nozzle 16 is provided at the connection point. The high-pressure water spray cooling system 13 sprays high-pressure water into the pressure stabilizing system 2 through the first nozzle 16 to achieve the cooling effect and meet the gas supply requirements of the steam seal, maintaining the pressure of the self-sealing system. The low-pressure water spray cooling system 14 is connected to the tail end of the pressure stabilizing system 2. That is, the connection point between the low-pressure water spray cooling system 14 and the pressure stabilizing system 2 is located on the side of the equalization box 15 away from the gas supply system 1, and a second nozzle 17 is provided at the connection point. The low-pressure water spray cooling system 14 provides a water flow with low temperature and pressure to the equalization box 15 through the second nozzle 17 to maintain the low-pressure shaft seal gas supply temperature and automatically maintain the low-pressure steam seal gas supply temperature not exceeding 200°C.

[0029] In actual production, the steam gas temperature of the main steam supply system 4 introduced into the pressure stabilizing system 2 is 535℃, and the pressure is 8.83~9.8MPa, while the steam gas temperature of the auxiliary steam supply system 5 introduced into the pressure stabilizing system 2 is 500℃, and the pressure is 0.6MPa. The normal pressure of the system is between 0.103~0.15MPa. Therefore, it is necessary to treat the high-pressure steam in a certain way to maintain the normal pressure. An overflow device 18 is also provided on the pressure stabilizing system 2. The overflow device 18 includes a third branch 19 and a fourth branch 20, which are connected in parallel. A second electric valve 21 and two shut-off valves 40 are provided on the third branch 19, and a third valve 22 is provided on the fourth branch 20. The overflow device 18 is mainly used to overflow excess steam in the equalization tank 15 to the condenser, condense the steam into water, and maintain the normal steam pressure in the equalization tank 15. The second electric valve 21 is mainly used to open and close the overflow device 18. When the overflow device 18 is in operation, the second electric valve 21 is opened to allow excess high-temperature and high-pressure steam to enter the overflow device 18 and then enter the condenser through the overflow device 18, reducing the steam pressure inside the equalization tank 15. Similarly, the third valve 22 on the fourth branch 20 is not open under normal circumstances. The third valve 22 is used as a temporary measure when the second electric valve 21 is malfunctioning and under maintenance. When the steam turbine is under high load, steam is supplied from the high-pressure steam seal leakage to the low-pressure steam seal, and the steam flow rate is sufficient to meet the sealing requirements of the low-pressure steam seal.

[0030] The high-pressure water spray desuperheating system 13 also includes a fifth branch 25 and a sixth branch 26, which are connected in parallel. The fifth branch 25 is fixedly connected to one end of the first nozzle 16 via a flange 27, and the sixth branch 26 is fixedly connected to the other end of the first nozzle 16 via a flange 27. At least one shut-off valve 28 is also provided on the fifth branch 25 and the sixth branch 26 for switching on and off. The fifth branch 25 and the sixth branch 26 are high-pressure water pipes that introduce high-pressure water into the first nozzle 16. The water sprayed through the first nozzle 16 regulates the temperature of the steam in the equalization tank 15. The opening and closing of the shut-off valve 28 can switch on and off the fifth branch 25 and the sixth branch 26, thereby controlling the operation of the high-pressure water spray desuperheating system 13.

[0031] A steam output system is also installed at the end of the pressure stabilizing system 2 furthest from the gas supply system 1. The steam output system includes a first output pipe 23 and a second output pipe 24. The first output pipe 23 and the second output pipe 24 are respectively connected to the gas supply interfaces of the high-pressure steam seal and the low-pressure steam seal of the steam turbine through pipes. After the steam is processed by the pressure stabilizing system 2, it meets the gas supply requirements of the steam turbine and can be supplied through the first output pipe 23 and the second output pipe 24. This effectively prevents steam leakage at the front and rear shaft ends of the steam turbine, maintains the vacuum of the unit, saves energy consumption, and effectively prevents water from entering at the front and rear ends of the steam turbine, preventing steam from the front shaft end of the steam turbine from entering the front bearing housing and causing water to enter the lubricating oil, thus avoiding oil emulsification that could endanger the safe operation of the steam turbine.

[0032] The equalizing chamber 15 is also equipped with a first instrument assembly 37, which includes thermocouples, thermometers and pressure gauges, etc., for real-time detection of various parameters of water vapor in the equalizing chamber 15. At the same time, a second instrument assembly 38 and a filter 39 are also installed in the first output pipe 23 and the second output pipe 24 of the steam output system. The second instrument assembly 38 is used to detect whether the various parameters of the output steam meet the requirements, and the filter 39 can prevent impurities from entering the shaft seal of the steam turbine.

[0033] Example 2: As Figures 1 to 7 The steam turbine sealing regulation system shown differs from Embodiment 1 only in that nozzle seats 29 are symmetrically arranged on the first nozzle 16, and nozzle pipes 30 are respectively provided on the two nozzle seats 29. Each nozzle pipe 30 includes a fixing part 31 and a nozzle part 32. Two nozzles 33 are provided on the side wall of the nozzle part 32. The nozzles 33 are arranged along the axial direction of the nozzle pipe 30 and face the pressure stabilizing system 2. The fixing part 31 of the nozzle pipe 30 is slidably connected in the nozzle seat 29, and a bushing 34 is sleeved on the outside of the nozzle pipe 30. One end of the bushing 34 is a fixed end, which is embedded between the nozzle seat 29 and the main body of the first nozzle 16. An elastic member 35 is provided between the fixing part 31 and the fixed end of the bushing 34.

[0034] The symmetrically arranged nozzle seats 29 correspond to the fifth branch 25 and the sixth branch 26, respectively. The nozzles 33 are narrow-diameter, allowing high-pressure water to be sprayed out as a mist, maximizing the cooling effect of the mist and rapidly reducing the temperature within the equalizing chamber 15. This enables rapid temperature regulation to meet the gas supply requirements of the steam sealing system more quickly. The nozzle pipe 30 can slide axially relative to the nozzle seat 29. When the nozzle pipe 30 slides on the nozzle seat 29, the number of nozzles 33 exposed outside the bushing 34 can be controlled, thereby controlling the amount of water sprayed from the nozzles 33 and further controlling the temperature regulation efficiency within the equalizing chamber 15. When rapid cooling is required, the water pressure entering the first nozzle 16 is increased. This increased pressure causes the fixed part 31 of the nozzle 30 to slide within the nozzle seat 29, exposing the nozzles 33 on the side wall of the nozzle 30 to the bushing 34. This increases the number of effective nozzles 33, thereby increasing the water flow and achieving a rapid temperature reduction in the equalization box 15. Once the temperature is reduced and controlled, the water pressure entering the first nozzle 16 is reduced. With the reduced pressure, the nozzle 30 resets under the action of the elastic element 35, and some nozzles 30 re-close inside the bushing 34, reducing the number of effective nozzles 33 and thus decreasing the water flow. This achieves temperature stabilization or heating. Through these operations, the temperature and pressure within the equalization box 15 can be quickly adjusted to rapidly meet the needs of different gas sources supplying the turbine.

[0035] The vent diameter of flange 27 is larger than that of nozzle fixing part 31, so that the part of fixing part 31 located at the vent of flange 27 can withstand the steam pressure, improve the stress effect of nozzle, and better control the movement of nozzle 30. Furthermore, a sealing ring is required at the connection between flange 27 and nozzle seat 29 to prevent steam leakage.

[0036] Example 3: As Figures 1 to 8 The steam turbine sealing adjustment system shown is different from that of Embodiment 2 only in that the nozzle 30 has an internal thread 36 structure.

[0037] The nozzle 30 is designed with an internal thread 36. When water flows into the nozzle 30, the water will be resisted by the internal thread 36 as it flows through it. At the same time, the water will exert a reaction force on the internal thread 36, causing the nozzle 30 to rotate. This allows the nozzle 33 to rotate around the nozzle 30, achieving the effect of rotating water spraying. Water mist is sprayed in the direction of the equalizing box 15 and the air supply system 1, resulting in a uniform temperature drop and a larger cooling area.

[0038] To ensure the nozzle 30 can rotate within the bushing 34, the bushing 34 and the nozzle 30 are allowed to rotate freely with a clearance fit. A connecting baffle is provided between the elastic element 35 and the fixing part 31 of the nozzle 30 to prevent the elastic element 35 from rotating along with the nozzle 30, which could cause it to stretch and be damaged. The friction between the connecting baffle and the fixing part 31 is kept as low as possible, which facilitates the rotation of the nozzle 30 while preventing excessive shearing force on the elastic element 35. Simultaneously, the fixing part 31 of the nozzle 30 and the nozzle seat 29 are also with a clearance fit to prevent excessive friction between them, which could prevent the nozzle 30 from rotating.

Claims

1. A steam seal regulating system for a steam turbine, characterized in that, It includes a gas supply system and a pressure stabilizing system, wherein the gas supply system is connected to the pressure stabilizing system, and the pressure stabilizing system is provided with a throttling orifice plate on the side of the gas supply system closer to the gas supply system; The pressure stabilizing system includes a pressure equalization box, which is connected to a high-pressure water spray cooling system via a first nozzle on the side near the gas supply system. The first nozzle has symmetrically arranged nozzle seats, each with a spray pipe. Each spray pipe includes a nozzle opening and a fixed part slidably connected within the nozzle seat. The nozzle opening is located on the side wall of the spray pipe and has several nozzles facing the pressure stabilizing system. The nozzles are arranged axially along the spray pipe. The first nozzle is connected to the high-pressure water spray cooling system via a flange, the vent diameter of which is larger than the vent diameter of the fixed part of the spray pipe. A bushing is fitted around the outside of the spray pipe, and the bushing is fixed relative to the nozzle seat. An elastic element is provided between the fixed part and the bushing. The inside of the spray pipe has an internal thread structure. When performing a cooling operation, the water pressure entering the first nozzle is increased. The increased water pressure will push the fixed part of the nozzle to slide inside the nozzle seat, causing the nozzle on the side wall of the nozzle to protrude from the bushing, thereby increasing the water spray volume.

2. The steam seal regulating system for a steam turbine according to claim 1, characterized in that, The gas supply system includes a main steam supply system and an auxiliary steam supply system. The main steam supply system includes a main steam pipeline, and at least one first valve is installed on the main steam pipeline.

3. The steam seal regulating system for a steam turbine according to claim 2, characterized in that, The auxiliary steam supply system includes a first branch and a second branch connected in parallel. The first branch is equipped with a first electric valve, and the second branch is equipped with a second valve.

4. The steam seal regulating system for a steam turbine according to claim 1, characterized in that, It also includes a cooling system, which includes a high-pressure water spray cooling system and a low-pressure water spray cooling system. The side of the equalizing box away from the gas supply system is connected to the low-pressure water spray cooling system through a second nozzle.

5. A steam turbine steam seal regulation system according to any one of claims 1 to 4, characterized in that, It also includes an overflow device, which includes a third branch and a fourth branch connected in parallel. The third branch is equipped with a second electric valve, and the fourth branch is equipped with a third valve.

6. A steam turbine steam seal regulating system according to any one of claims 1 to 4, characterized in that, The pressure stabilizing system is provided with a steam output system on the side away from the gas supply system. The steam output system includes a first output pipe and a second output pipe that are connected in parallel to the pressure stabilizing system and are respectively connected to the front steam seal of the steam turbine and the rear steam seal of the steam turbine.

7. The steam seal regulating system for a steam turbine according to claim 4, characterized in that, The high-pressure water spray cooling system includes a fifth branch and a sixth branch connected in parallel. The fifth branch and the sixth branch are respectively connected to the two ends of the first nozzle through flanges, and each of the fifth branch and the sixth branch is equipped with at least one shut-off valve.

8. The steam seal regulating system for a steam turbine according to claim 7, characterized in that, One end of the bushing is a fixed end, which is embedded between the nozzle seat and the body of the first nozzle.

9. A steam turbine steam seal regulating system according to claim 8, characterized in that, The symmetrically arranged nozzle seats correspond to the fifth and sixth branches respectively, and the nozzles are narrow-diameter, which can spray high-pressure water in the form of water mist.

10. A steam turbine sealing regulation system according to claim 8 or 9, characterized in that, The nozzle is externally connected to a bushing; when water flows through the nozzle, the water is resisted by the internal thread, causing the nozzle to rotate.

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