Cooling device and method for a steam turbine super-high pressure cylinder

Abstract

The present application relates to the technical field of steam turbine, and discloses a cooling device and method for super-high pressure cylinder of steam turbine, which comprises a cooling steam extraction module, a cooling steam delivery module, a middle split surface bolt cooling module, a cooling steam recovery module and an instrument monitoring module.The outlet of the cooling steam extraction module is communicated with the inlet of the cooling steam delivery module, the outlet of the cooling steam delivery module is communicated with the inlet of the middle split surface bolt cooling module, the outlet of the middle split surface bolt cooling module is communicated with the inlet of the cooling steam recovery module, and the instrument monitoring module is connected with the cooling steam delivery module, the middle split surface bolt cooling module and the cooling steam recovery module respectively to realize parameter monitoring.The present application forms a complete cooling loop through the cooperation of each module, realizes full-coverage staged cooling of bolts, medium circulation and parameter monitoring, solves the problems of uneven cooling, high energy consumption and insufficient safety, and improves stability and economy.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, specifically to a cooling device and method for an ultra-high pressure cylinder of a steam turbine. Background Technology

[0002] Steam turbines are core power equipment in fields such as thermal power generation and industrial drive. As a key component of steam turbines, the operation stability of ultra-high pressure cylinders directly affects the safety and efficiency of the entire unit. As an important connecting component of ultra-high pressure cylinders, the split bolts are prone to thermal stress due to uneven temperature distribution under high temperature and high pressure conditions. Therefore, a special cooling device is required to cool them to ensure the normal operation of ultra-high pressure cylinders.

[0003] In existing technologies, the cooling of split bolts in ultra-high pressure cylinders is mostly achieved by using a single pipeline to transport the cooling medium. To improve the cooling effect, a common solution is to increase the amount of cooling medium transported. However, this method not only leads to a large waste of cooling medium and high energy consumption, but also fails to achieve uniform cooling of the bolts, which can easily cause local overheating or insufficient cooling of the bolts, resulting in thermal stress damage. At the same time, there is a lack of effective parameter monitoring methods, making it difficult to monitor the operating status in real time during the cooling process, which poses significant safety hazards and cannot meet the cooling requirements of split bolts in ultra-high pressure cylinders. Therefore, a cooling device and method for ultra-high pressure cylinders of steam turbines is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a cooling device and method for ultra-high pressure cylinders of steam turbines, which solves the technical problems of uneven cooling of split bolts, high energy consumption, and insufficient operational safety in existing ultra-high pressure cylinders, and is unable to meet the cooling requirements of ultra-high pressure cylinder bolts.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cooling device for an ultra-high pressure cylinder of a steam turbine, comprising: Cooling steam extraction module, cooling steam delivery module, split-face bolt cooling module, cooling steam recovery module, and instrument monitoring module; The outlet of the cooling steam extraction module is connected to the inlet of the cooling steam delivery module, the outlet of the cooling steam delivery module is connected to the inlet of the split-face bolt cooling module, the outlet of the split-face bolt cooling module is connected to the inlet of the cooling steam recovery module, and the instrument monitoring module is connected to the cooling steam delivery module, the split-face bolt cooling module, and the cooling steam recovery module respectively to realize parameter monitoring. The cooling steam extraction module is used to obtain cooling medium from the high-pressure exhaust pipe of the unit; the cooling steam delivery module is used to directionally deliver the cooling medium to the target cooling position; the split bolt cooling module is used to perform full-coverage and graded cooling of the split bolts of the ultra-high pressure cylinder; the cooling steam recovery module is used to guide the cooled medium after heat exchange to the existing recovery pipeline of the unit for recycling; and the instrument monitoring module is used to collect the pressure and temperature parameters of the cooling circuit in real time and ensure the safe and stable operation of the device. Through the coordinated operation of various modules, problems such as uneven cooling of split bolts, energy waste, and operational safety hazards in ultra-high pressure cylinders have been effectively solved. Precise and controllable bolt cooling and efficient circulation of cooling medium have been achieved, improving the stability and economy of the device operation, extending the service life of ultra-high pressure cylinder bolts, and adapting to the actual operating conditions of ultra-high pressure cylinders.

[0006] Preferably, the cooling steam extraction module includes a steam extraction interface and a check valve assembly. The steam extraction interface is sealed to the high-pressure exhaust pipe, and the check valve assembly is located downstream of the steam extraction interface to prevent backflow of the cooling medium.

[0007] Preferably, the cooling steam delivery module includes an inlet main pipe and several inlet branch pipes. The inlet main pipe is connected to the steam extraction module, and the several inlet branch pipes are evenly distributed and connected to the corresponding inlets of the split-face bolt cooling module.

[0008] Preferably, the cooling steam delivery module is further provided with an adjustment component, which is used to control the flow rate and delivery speed of the cooling medium.

[0009] Preferably, the split-face bolt cooling module is arranged circumferentially along the split-face of the ultra-high pressure cylinder, and the cooling medium enters from one side of the bolt and exits from the other side to form a through-type cooling channel.

[0010] Preferably, the cooling steam recovery module includes an outlet branch pipe and an outlet main pipe. The outlet branch pipe is connected to the outlet of the split bolt cooling module, and the outlet main pipe collects and guides the cooled medium after heat exchange to the shaft seal leakage deaerator pipeline.

[0011] Preferably, all pipes of the cooling device are provided with an external heat insulation and protection structure, which is composed of a heat insulation layer and an outer protective layer.

[0012] Preferably, the instrument monitoring module includes a pressure monitoring component and a temperature monitoring component, both of which are installed locally to achieve intuitive on-site monitoring.

[0013] A cooling method for an ultra-high pressure cylinder of a steam turbine, based on the aforementioned cooling device for an ultra-high pressure cylinder of a steam turbine, includes the following steps: Step 1: Cooling medium acquisition. Suitable cooling steam is extracted from the high-pressure exhaust pipe of the unit through the cooling steam extraction module. Step 2: Cooling medium delivery. The cooling steam is stabilized and directed to the cooling area of ​​the split bolts in the ultra-high pressure cylinder via the cooling steam delivery module. Step 3: Staged cooling is performed, and the split bolts of the ultra-high pressure cylinder are cooled step by step through the split bolt cooling module to ensure that the bolt temperature is reduced uniformly. Step 4: Cooling medium recovery. The cooling steam that has completed heat exchange is guided through the cooling steam recovery module to the unit's existing recovery pipeline to achieve medium reuse. Step 5: Parameter monitoring and control. The pressure and temperature parameters of the cooling circuit are collected in real time through the instrument monitoring module to ensure that the cooling process is stable and controllable.

[0014] Preferably, the graded cooling in step three is performed by progressively cooling from the exhaust side to the intake side along the dividing surface of the ultra-high pressure cylinder, so that the cooling rate of each part of the bolt is consistent.

[0015] Compared with the prior art, the present invention provides a cooling device and method for an ultra-high pressure cylinder of a steam turbine, which has the following beneficial effects: 1. The cooling device and method for the ultra-high pressure cylinder of this steam turbine, by setting up a cooling steam extraction module, a cooling steam delivery module, a center-part bolt cooling module, a cooling steam recovery module, and an instrument monitoring module, with each module connected in sequence to form a complete cooling circuit, achieves full-coverage and graded cooling of the center-part bolts of the ultra-high pressure cylinder. At the same time, the instrument monitoring module monitors the circuit parameters in real time, and the recovery module recycles the cooling medium. It has the advantages of stable cooling effect, safe and reliable operation, energy saving and environmental protection, and solves the problems of uneven cooling, high energy consumption, insufficient operational safety and inability to meet the cooling requirements of ultra-high pressure cylinder bolts in existing cooling methods. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cooling device system for the ultra-high pressure cylinder of a steam turbine according to the present invention; Figure 2 This is a diagram of the cooling system for the split bolts in the ultra-high pressure cylinder of the present invention; Figure 3 This is a step diagram of the cooling method for the ultra-high pressure cylinder of a steam turbine according to the present invention.

[0017] In the diagram: 1. Cooling steam extraction module; 2. Cooling steam delivery module; 3. Center-part bolt cooling module; 4. Cooling steam recovery module; 5. Instrument monitoring module; 6. Thermal insulation and protection structure; 101. High-pressure exhaust pipe; 102. Steam intake interface; 103. Check valve assembly; 201. Inlet main pipe; 202. Adjustment assembly; 203. Inlet branch pipe; 401. Outlet branch pipe; 402. Outlet main pipe; 403. Shaft seal leakage deaerator pipeline; 501. Pressure monitoring component; 502. Temperature monitoring component. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention provides a technical solution: a cooling device for an ultra-high pressure cylinder of a steam turbine. Please refer to [link / reference]. Figure 1-3 The system includes: a cooling steam extraction module 1, a cooling steam delivery module 2, a split-face bolt cooling module 3, a cooling steam recovery module 4, and an instrument monitoring module 5. The outlet of the cooling steam extraction module 1 is connected to the inlet of the cooling steam delivery module 2, the outlet of the cooling steam delivery module 2 is connected to the inlet of the split-face bolt cooling module 3, and the outlet of the split-face bolt cooling module 3 is connected to the inlet of the cooling steam recovery module 4. The instrument monitoring module 5 is connected to the cooling steam delivery module 2, the split-face bolt cooling module 3, and the cooling steam recovery module 4 respectively to monitor parameters. The cooling steam extraction module 1 is used to obtain cooling medium from the high-pressure exhaust pipe 101 of the unit. The cooling steam delivery module 2 is used to directionally deliver the cooling medium to the target cooling position. The split-face bolt cooling module 3 is used to perform full-coverage graded cooling of the split-face bolts of the ultra-high pressure cylinder. The cooling steam recovery module 4 is used to guide the cooled medium after heat exchange to the existing recovery pipe of the unit for recycling. The instrument monitoring module 5 is used to collect the pressure and temperature parameters of the cooling circuit in real time and ensure the safe and stable operation of the device. The cooling medium is high-pressure exhaust steam from the unit (pressure 0.8-1.2MPa, temperature 300-350℃). Flange seals are used at the connection points of each module. The instrument monitoring module 5 is set with alarm thresholds, and the cooling circuit is automatically cut off when the limit is exceeded. The system integrates five major modules, including the cooling steam take-off module 1 and the cooling steam delivery module 2, to achieve a closed-loop cooling process. It can provide full-coverage and graded cooling for the split bolts in the ultra-high pressure cylinder, and ensure operational safety through the instrument monitoring module 5. At the same time, the recovery module realizes medium circulation, reduces energy consumption, and adapts to the complex operating conditions of the turbine's ultra-high pressure cylinder.

[0020] Please see Figure 1The cooling steam extraction module 1 includes a steam extraction interface 102 and a check component 103. The steam extraction interface 102 is sealed to the high-pressure exhaust pipe 101. The check component 103 is located downstream of the steam extraction interface 102 to prevent the cooling medium from flowing back. The steam intake interface 102 is welded and sealed, and the check valve component 103 is a spring-loaded check valve with an opening pressure of 0.05MPa and a closing response time of ≤0.5s, effectively preventing the cooling medium from flowing back into the high-pressure exhaust pipe 101. The sealed connection of the steam intake interface 102 ensures that there is no leakage in the steam intake, and the check valve component 103 can respond quickly to prevent the cooling medium from flowing back, avoid pressure fluctuations in the high-pressure exhaust pipe 101, ensure stable steam intake of the cooling steam intake module 1, and provide a reliable medium source for the subsequent cooling process.

[0021] Please see Figure 1 The cooling steam conveying module 2 includes an inlet main pipe 201 and several inlet branch pipes 203. The inlet main pipe 201 is connected to the steam extraction module, and the several inlet branch pipes 203 are evenly distributed and connected to the corresponding inlets of the split-face bolt cooling module 3. The inlet main pipe 201 has a diameter of 150mm, and the number of inlet branch pipes 203 is the same as the number of center-part bolts (8-12). The spacing between each branch pipe is uniform, and the interface is sealed with threads to ensure uniform distribution of the medium. The inlet main pipe 201 and several evenly distributed inlet branch pipes 203 work together to deliver the cooling medium evenly to each inlet of the center-part bolt cooling module 3, avoiding insufficient cooling medium in some areas, ensuring that all center-part bolts can receive sufficient cooling, and improving the uniformity of cooling.

[0022] Please see Figure 1 The cooling steam delivery module 2 is also equipped with an adjustment component 202, which is used to control the flow rate and delivery speed of the cooling medium. The regulating component 202 consists of an electric regulating valve and a flow sensor, with an adjustment range of 0-50t / h. It can be adjusted in real time according to the bolt temperature, with a control accuracy of ±0.5t / h, and is suitable for different cooling requirements. The regulating component 202 can accurately control the flow rate and delivery speed of the cooling medium, which can be flexibly adjusted according to the bolt cooling requirements to avoid insufficient or excessive cooling, and can also ensure the stable operation of the cooling steam delivery module 2, adapting to the cooling requirements of the steam turbine under different operating conditions.

[0023] Please see Figure 1 The split-face bolt cooling module 3 is arranged circumferentially along the split-face of the ultra-high pressure cylinder, and the cooling medium enters from one side of the bolt and exits from the other side to form a through-type cooling channel; The cooling channel of the split-face bolt cooling module 3 has a diameter of 10-15mm and the inner wall of the channel is polished. The flow rate of the cooling medium is controlled at 2-3m / s to ensure that the through-cooling is thorough and without dead angles. The split-face bolt cooling module 3, which is arranged circumferentially along the split surface of the ultra-high pressure cylinder, achieves full coverage cooling of the bolts through a through-flow channel that enters from one side and exits from the other side. This avoids local overheating or uneven cooling of the bolts, reduces bolt thermal stress, and extends the service life of the bolts.

[0024] Please see Figure 1 The cooling steam recovery module 4 includes an outlet branch pipe 401 and an outlet main pipe 402. The outlet branch pipe 401 is connected to the outlet of the split bolt cooling module 3. The outlet main pipe 402 collects and guides the cooling medium after heat exchange to the shaft seal leakage deaerator pipeline 403. The outlet branch pipe 401 is connected to the outlet of the split bolt cooling module 3 by a flange. The diameter of the outlet main pipe 402 is the same as that of the inlet main pipe 201. A check valve structure is set at the interface of the pipe 403 for guiding the flow to the shaft seal leakage deaerator. The outlet branch pipe 401 and the outlet main pipe 402 work together to efficiently collect the cooling medium after heat exchange and guide it to the existing shaft seal leakage deaerator pipe 403 of the unit for recycling. No new recovery equipment is required, which reduces equipment investment, reduces medium waste, and improves energy saving.

[0025] Please see Figure 1 All pipes of the cooling device are equipped with a thermal insulation and protection structure 6, which is composed of a thermal insulation layer and an outer protective layer. The insulation layer uses aluminum silicate cotton (50-80mm thick), the outer protective layer uses galvanized iron sheet, and the joints are sealed with sealant. The insulation effect can keep the surface temperature of the pipeline ≤50℃, reducing heat loss. The external insulation and protection structure 6 (insulation layer and outer protective layer) of all pipelines can effectively reduce the heat loss of the cooling medium during transportation and heat exchange, ensure the cooling effect, and prevent the high temperature of the pipeline surface from burning the staff, thus improving the safety of equipment operation.

[0026] Please see Figure 1 The instrument monitoring module 5 includes a pressure monitoring component 501 and a temperature monitoring component 502. Both the pressure monitoring component 501 and the temperature monitoring component 502 are installed locally to achieve intuitive on-site monitoring. The pressure monitoring component 501 uses a pressure gauge (range 0-2MPa, accuracy 0.4 grade), and the temperature monitoring component 502 uses a thermocouple thermometer (range 0-400℃). Both are installed in conspicuous locations on the pipeline for easy on-site observation. The pressure monitoring component 501 and the temperature monitoring component 502 of the instrument monitoring module 5 are installed locally, which can intuitively and in real time collect the pressure and temperature parameters of the cooling circuit, detect abnormal parameters in a timely manner, avoid cooling circuit failures, ensure the safe and stable operation of the device, and reduce maintenance costs.

[0027] A cooling method for an ultra-high pressure cylinder of a steam turbine, based on the aforementioned cooling device for an ultra-high pressure cylinder of a steam turbine, please refer to [link to relevant documentation]. Figure 3 It includes the following steps: Step 1: Cooling medium acquisition: Suitable cooling steam is extracted from the high-pressure exhaust pipe 101 of the unit through the cooling steam extraction module 1. Step 2: Cooling medium delivery. Cooling steam is delivered in a regulated and directional manner to the cooling area of ​​the split bolts in the ultra-high pressure cylinder via the cooling steam delivery module 2. Step 3: Staged cooling is performed. The split bolt cooling module 3 is used to perform staged through-cooling of the split bolts of the ultra-high pressure cylinder to ensure that the bolt temperature is reduced uniformly. Step 4: Cooling medium recovery. The cooling steam that has completed heat exchange is guided through the cooling steam recovery module 4 to the existing recovery pipeline of the unit to realize the reuse of the medium. Step 5: Parameter monitoring and control. The pressure and temperature parameters of the cooling circuit are collected in real time through the instrument monitoring module 5 to ensure that the cooling process is stable and controllable. In step one, the pressure of the extracted cooling steam is controlled at 0.8-1.2 MPa; in step two, the pressure is stabilized to 0.6-0.9 MPa; and in step four, the temperature of the recovered medium is controlled at 150-200℃. The time between each step is ≤10 minutes. Based on the cooling device, the cooling method achieves a closed loop of cooling medium acquisition, transportation, cooling, recovery, and monitoring through a five-step standardized process. The steps are clear, highly operable, and can ensure uniform reduction of bolt temperature while realizing medium reuse. It balances cooling effect and energy saving, and is suitable for industrial applications.

[0028] Please see Figure 3 In step three, the staged cooling is performed by gradually advancing the cooling from the exhaust side to the intake side along the middle dividing surface of the ultra-high pressure cylinder, so that the cooling rate of each part of the bolt is consistent. The staged cooling process proceeds at a speed of 0.5-1 m / min, with an initial cooling temperature of 300℃ on the exhaust side and a gradual reduction in the cooling temperature on the inlet side to 150℃, ensuring that the temperature difference between different parts of the bolt is ≤20℃. The staged cooling method, which proceeds step by step from the exhaust side to the inlet side along the split plane in step three, ensures that the cooling rate of different parts of the bolt remains consistent, avoids excessively rapid local cooling that could generate thermal stress, prevents bolt deformation or damage, further improves cooling quality, and ensures the operational stability of the ultra-high pressure cylinder.

[0029] This solution involves the following steps: First, suitable cooling steam is drawn from the high-pressure exhaust pipe 101 via the steam intake interface 102 of the cooling steam extraction module 1, with the check valve 103 preventing backflow. The cooling steam is then directionally transported through the inlet header 201 and inlet branch 203 of the cooling steam delivery module 2, with the flow rate and speed controlled by the regulating component 202. After entering the split-face bolt cooling module 3, the bolts are subjected to staged cooling along a through-flow channel. After heat exchange, the medium is guided through the outlet branch 401 and outlet header 402 of the cooling steam recovery module 4 to the shaft seal leakage deaerator pipeline 403 for recycling. The pressure monitoring component 501 and temperature monitoring component 502 of the instrument monitoring module 5 collect parameters in real time to ensure operational safety. The external insulation protection structure 6 of the pipeline reduces heat loss. Operation must be performed according to the five-step cooling process to ensure stable and controllable cooling.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for an ultra-high pressure cylinder of a steam turbine, characterized in that, include: Cooling steam extraction module (1), cooling steam delivery module (2), split bolt cooling module (3), cooling steam recovery module (4), and instrument monitoring module (5); The outlet of the cooling steam extraction module (1) is connected to the inlet of the cooling steam delivery module (2), the outlet of the cooling steam delivery module (2) is connected to the inlet of the split bolt cooling module (3), the outlet of the split bolt cooling module (3) is connected to the inlet of the cooling steam recovery module (4), and the instrument monitoring module (5) is connected to the cooling steam delivery module (2), the split bolt cooling module (3), and the cooling steam recovery module (4) respectively to realize parameter monitoring. The cooling steam extraction module (1) is used to obtain cooling medium from the high-pressure exhaust pipe (101) of the unit. The cooling steam delivery module (2) is used to directionally deliver the cooling medium to the target cooling position. The split bolt cooling module (3) is used to perform full-coverage graded cooling of the split bolts of the ultra-high pressure cylinder. The cooling steam recovery module (4) is used to guide the cooled medium after heat exchange to the existing recovery pipe of the unit for recycling. The instrument monitoring module (5) is used to collect the pressure and temperature parameters of the cooling circuit in real time and ensure the safe and stable operation of the device.

2. The cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The cooling steam extraction module (1) includes a steam extraction interface (102) and a check component (103). The steam extraction interface (102) is sealed to the high-pressure exhaust pipe (101). The check component (103) is located downstream of the steam extraction interface (102) to prevent the cooling medium from flowing back.

3. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The cooling steam delivery module (2) includes an inlet main pipe (201) and several inlet branch pipes (203). The inlet main pipe (201) is connected to the steam extraction module, and the several inlet branch pipes (203) are evenly distributed and connected to the corresponding inlets of the split-face bolt cooling module (3).

4. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The cooling steam delivery module (2) is also provided with an adjustment component (202), which is used to control the flow rate and delivery speed of the cooling medium.

5. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The split-face bolt cooling module (3) is arranged circumferentially along the split-face of the ultra-high pressure cylinder, and the cooling medium enters from one side of the bolt and exits from the other side to form a through-type cooling channel.

6. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The cooling steam recovery module (4) includes an outlet branch pipe (401) and an outlet main pipe (402). The outlet branch pipe (401) is connected to the outlet of the split bolt cooling module (3). The outlet main pipe (402) collects and guides the cooling medium after heat exchange to the shaft seal leakage deaerator pipeline (403).

7. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: All pipes of the cooling device are provided with an external heat insulation and protection structure (6), which is composed of a heat insulation layer and an outer protective layer.

8. A cooling device for an ultra-high pressure cylinder of a steam turbine according to claim 1, characterized in that: The instrument monitoring module (5) includes a pressure monitoring component (501) and a temperature monitoring component (502). Both the pressure monitoring component (501) and the temperature monitoring component (502) are installed locally to achieve on-site intuitive monitoring.

9. A cooling method for an ultra-high pressure cylinder of a steam turbine, based on a cooling device for an ultra-high pressure cylinder of a steam turbine as described in any one of claims 1-8, characterized in that, The steps include the following: Step 1: Cooling medium acquisition: Suitable cooling steam is extracted from the high-pressure exhaust pipe (101) of the unit through the cooling steam extraction module (1); Step 2: Cooling medium delivery. The cooling steam is stabilized and directed to the cooling area of ​​the split bolts in the ultra-high pressure cylinder via the cooling steam delivery module (2). Step 3: Staged cooling is performed. The split bolts of the ultra-high pressure cylinder are cooled step by step through the split bolt cooling module (3) to ensure that the bolt temperature is reduced uniformly. Step 4: Cooling medium recovery. The cooling steam that has completed heat exchange is guided through the cooling steam recovery module (4) to the existing recovery pipeline of the unit to realize the reuse of the medium. Step 5: Parameter monitoring and control. The pressure and temperature parameters of the cooling circuit are collected in real time through the instrument monitoring module (5) to ensure that the cooling process is stable and controllable.

10. A cooling method for an ultra-high pressure cylinder of a steam turbine according to claim 9, characterized in that: The graded cooling in step three involves progressively cooling the cylinder from the exhaust side to the intake side along the split surface of the ultra-high pressure cylinder, ensuring that the cooling rate of each part of the bolt remains consistent.

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