A device and method for warming up a steam turbine using high-temperature nitrogen

Abstract

The present application relates to the technical field of steam turbine warming, in particular to a device and method for warming steam turbine by high-temperature nitrogen. The device for warming steam turbine by high-temperature nitrogen comprises a nitrogen input system, a nitrogen heating system and a nitrogen circulation system. The nitrogen input system is connected to the nitrogen heating system for inputting nitrogen. The nitrogen heating system is connected to the nitrogen input system and the nitrogen circulation system for heating the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system for inputting the heated nitrogen into the high-pressure cylinder of the steam turbine for warming and outputting the heated nitrogen from the high-pressure cylinder to the nitrogen heating system. The present application warms the high-pressure cylinder by high-temperature circulating nitrogen with good inertia, which can save the consumption of warming steam during the cold-state starting process of the thermal power unit, reduce the starting time of the unit and save the consumption of starting fuel of the unit.

Description

Technical Field

[0001] This invention relates to the field of steam turbine cylinder warming technology, and specifically to an apparatus and method for steam turbine cylinder warming using high-temperature nitrogen gas. Background Technology

[0002] Currently, during the cold start-up of steam turbines in thermal power units of various capacities, a high-pressure cylinder warm-up is necessary. This warm-up requires steam with specific parameters, obtained from the boiler by burning No. 0 diesel and coal. This process is time-consuming (even longer for units with poor vibration), resulting in energy waste. According to incomplete statistics, the fuel cost for a 600,000 kW thermal power unit during cold start-up ranges from approximately 1.2 million to 2.4 million yuan. Assuming the warm-up time accounts for about 1 / 4 of the total cold start-up time, the fuel cost for warm-up is estimated at 300,000 to 600,000 yuan. Based on the plant's two 600,000 kW units undergoing four cold starts per year, the annual fuel cost for warm-up is approximately 1.2 million to 2.4 million yuan.

[0003] The main function of traditional steam turbine cylinder warm-up is to heat the internal components of the turbine, including the rotor, stator, inner cylinder, outer cylinder, and main valves, using high-temperature, high-pressure steam. It also involves closely monitoring parameters such as differential expansion and cylinder expansion to prevent rubbing during high-speed turbine rotation. With energy conservation and emission reduction now in a critical phase, energy saving during unit startup is extremely important. To conserve fuel consumed during cold-start thermal power units due to cylinder warm-up, a reliable, energy-efficient, and highly effective cylinder warm-up system is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a device for warming up a steam turbine cylinder using high-temperature nitrogen gas, so as to solve the problems of high energy waste and high cost in the existing high-temperature and high-pressure steam cylinder warming technology.

[0005] To address the aforementioned problems, this invention proposes a device for warming up a steam turbine cylinder using high-temperature nitrogen gas. The technical solution employed is as follows: A device for warming up a steam turbine cylinder using high-temperature nitrogen gas includes: a nitrogen gas input system, a nitrogen gas heating system, and a nitrogen gas circulation system. The nitrogen input system is connected to the nitrogen heating system and is used to input nitrogen. The nitrogen heating system is connected to the nitrogen input system and the nitrogen circulation system, and is used to heat the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system and is used to input heated nitrogen into the high-pressure cylinder of the steam turbine for warming, and then output the heated nitrogen flowing out of the high-pressure cylinder and circulate it back to the nitrogen heating system.

[0006] Furthermore, the nitrogen circulation system includes a heated nitrogen input system and a heated nitrogen output system. The heated nitrogen input system is connected to the nitrogen heating system and to the high-pressure cylinder, and is used to input heated nitrogen into the high-pressure cylinder. The heated nitrogen output system is connected to the high-pressure cylinder and to the nitrogen heating system, and is used to circulate the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system.

[0007] Furthermore, the heated nitrogen output system includes either a cylinder warming exhaust system or a turbine body condensate exhaust system. The cylinder warming and exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The turbine body's condensate exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system.

[0008] Furthermore, the heated nitrogen output system includes two types: a cylinder warming exhaust system and a turbine body condensate exhaust system. The cylinder warming and exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The turbine body's condensate exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system.

[0009] Furthermore, the heated nitrogen output system also includes a nitrogen venting system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, respectively, to reduce the pressure of the heated nitrogen circulating into the nitrogen heating system.

[0010] Furthermore, the nitrogen circulation system also includes a nitrogen booster system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, and is also connected to the nitrogen heating system to increase the pressure of the heating gas circulating to the nitrogen heating system.

[0011] Furthermore, the turbine body drain and exhaust system includes a turbine body drain pipe exhaust control valve and a turbine body drain pipe exhaust pipe. The turbine body drain and exhaust system is located between the turbine body drain control valve and the condenser. The turbine body drain pipe exhaust control valve is located on the turbine body drain pipe exhaust pipe. The turbine body drain pipe exhaust pipe is connected to the turbine body drain control valve and connected to the nitrogen heating system.

[0012] Furthermore, the nitrogen heating input system includes a temperature detection system and a pressure detection system. The pressure detection system is connected to the nitrogen heating system and to the temperature detection system; the temperature detection system is connected to the pressure detection system and to the high-pressure cylinder.

[0013] Furthermore, the nitrogen heating system includes a nitrogen electric heater, a heater inlet low-temperature nitrogen manual valve, and a heater outlet low-temperature nitrogen manual valve, wherein the nitrogen electric heater is disposed between the heater inlet low-temperature nitrogen manual valve and the heater outlet low-temperature nitrogen manual valve.

[0014] This invention also proposes a method for warming up a steam turbine cylinder using high-temperature nitrogen gas. Based on the above-mentioned apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas, the method includes the following steps: S1, nitrogen is introduced into the nitrogen heating system through the nitrogen input system to obtain heated nitrogen; S2, heated nitrogen is fed into the high-pressure cylinder of the steam turbine through the nitrogen circulation system for warming, and the heated nitrogen flowing out of the high-pressure cylinder is transported to the nitrogen heating system to form a warming cycle.

[0015] Compared with the prior art, the present application has the following beneficial effects: This invention is an improved version. It introduces nitrogen through a nitrogen input system, heats the nitrogen via a nitrogen heating system, and then circulates it through a nitrogen recirculation system into the high-pressure cylinder of the steam turbine. The heated nitrogen flowing out of the high-pressure cylinder is then recirculated back to the nitrogen heating system, forming a warm-up cycle. This cycle maintains the high-temperature nitrogen in the turbine's cylinder warming device, ensuring the high-pressure cylinder completes its warm-up task. Furthermore, by using high-temperature circulating nitrogen with good inertia for high-pressure cylinder warming, this invention saves on steam consumption during cold starts of thermal power units, reduces start-up time, conserves fuel during startup, and lowers the cost of cylinder warming.

[0016] The nitrogen circulation system includes a heated nitrogen input system and a heated nitrogen output system. The heated nitrogen input system is connected to the nitrogen heating system and to the high-pressure cylinder, and is used to input heated nitrogen into the high-pressure cylinder. The heated nitrogen output system is connected to the high-pressure cylinder and the nitrogen heating system. It is used to circulate the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system, so as to facilitate the circulation of high-temperature and high-pressure nitrogen.

[0017] The heated nitrogen output system includes either a cylinder warming exhaust system or a turbine body condensate exhaust system. The cylinder warming and exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The turbine body's condensate exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system. Only one of these systems is needed to heat the high-pressure cylinder.

[0018] The heated nitrogen output system includes two types: a cylinder warming exhaust system and a turbine body condensate exhaust system. The cylinder warming and exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The turbine body's condensate exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system, allowing for simultaneous circulation between the two systems and making the heating of the high-pressure cylinder more effective.

[0019] The heated nitrogen output system also includes a nitrogen venting system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, respectively, to reduce the pressure of the heated nitrogen circulating to the nitrogen heating system and prevent the high-temperature and high-pressure nitrogen in the device from being too high.

[0020] The nitrogen circulation system also includes a nitrogen booster system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, and is also connected to the nitrogen heating system. This system is used to increase the pressure of the heating gas circulating to the nitrogen heating system, preventing the high-temperature and high-pressure nitrogen pressure in the device from being too low.

[0021] The nitrogen heating input system includes a temperature detection system and a pressure detection system. The pressure detection system is connected to the nitrogen heating system and the temperature detection system. The temperature detection system is connected to the pressure detection system and the high-pressure cylinder. The nitrogen in the device is replenished at any time through pressure detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device for warming up a steam turbine cylinder using high-temperature nitrogen gas according to the present invention. In the diagram, 1. Nitrogen cylinder assembly; 2. Nitrogen electric heater; 3. Manual valve for low-temperature nitrogen at the heater inlet; 4. Manual valve for low-temperature nitrogen at the heater outlet; 5. High-pressure cylinder; 6. Nitrogen booster fan; 7. Manual valve for nitrogen booster fan inlet; 8. Primary valve for cylinder warming intake; 9. Secondary valve for cylinder warming intake; 10. Primary valve for cylinder warming exhaust; 11. Secondary valve for cylinder warming exhaust; 12. Primary valve for exhaust from turbine body drain pipe; 13. Secondary valve for exhaust from turbine body drain pipe; 14. Primary valve for turbine body drain; 15. Secondary valve for turbine body drain; 16. High-pressure exhaust check valve; 17. Condenser; 18. Primary valve for nitrogen venting; 19. Secondary valve for nitrogen venting. Detailed Implementation

[0023] As cited in the background section, existing high-temperature, high-pressure steam cylinder warming methods suffer from high energy waste and high costs. Therefore, this invention provides a device for warming a steam turbine cylinder using high-temperature nitrogen, comprising: a nitrogen input system, a nitrogen heating system, and a nitrogen circulation system. The nitrogen input system is connected to the nitrogen heating system for inputting nitrogen. The nitrogen heating system is connected to both the nitrogen input system and the nitrogen circulation system for heating the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system and is used to input the heated nitrogen into the high-pressure cylinder 5 of the steam turbine for warming, and then circulate the heated nitrogen flowing out of the high-pressure cylinder 5 back to the nitrogen heating system. This invention inputs nitrogen through the nitrogen input system, heats it through the nitrogen heating system, and then circulates it into the high-pressure cylinder 5 through the nitrogen circulation system. The heated nitrogen flowing out of the high-pressure cylinder 5 is then circulated back to the nitrogen heating system. This cycle maintains the high-temperature nitrogen in the steam turbine cylinder warming device, thus completing the cylinder warming task for the high-pressure cylinder 5. This invention uses high-temperature circulating nitrogen with good inertness to warm up the high-pressure cylinder 5, which can save the consumption of warm-up steam during the cold start of thermal power units, reduce the start-up time of the unit, and save the fuel consumption for the start-up of the unit.

[0024] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] Specific embodiment 1 of the device for warming up a steam turbine cylinder using high-temperature nitrogen gas according to the present invention: In this embodiment, as Figure 1As shown, the device for warming up a steam turbine cylinder using high-temperature nitrogen includes: a nitrogen input system, a nitrogen heating system, and a nitrogen circulation system. The nitrogen input system is connected to the nitrogen heating system for inputting nitrogen. The nitrogen heating system is connected to both the nitrogen input system and the nitrogen circulation system for heating the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system and is used to input the heated nitrogen into the high-pressure cylinder 5 of the steam turbine for warming, and then circulate the heated nitrogen flowing out of the high-pressure cylinder 5 back to the nitrogen heating system. The nitrogen input system includes multiple nitrogen cylinder groups 1 for replenishing and inputting nitrogen. The nitrogen heating system includes a nitrogen electric heater 2, a heater inlet low-temperature nitrogen manual valve 3, and a heater outlet low-temperature nitrogen manual valve 4. The nitrogen electric heater 2 is positioned between the heater inlet low-temperature nitrogen manual valve 3 and the heater outlet low-temperature nitrogen manual valve 4. The heater inlet low-temperature nitrogen manual valve 3 is connected to the nitrogen input system, and the heater outlet low-temperature nitrogen manual valve 4 is connected to the nitrogen circulation system. In use, nitrogen is input into the nitrogen heating system through the high-pressure nitrogen input system to obtain heated nitrogen. The heated nitrogen is then input into the high-pressure cylinder 5 through the nitrogen circulation system for warming, and the heated nitrogen flowing out of the high-pressure cylinder 5 is transported to the nitrogen heating system to form a warming cycle.

[0027] In this embodiment, the nitrogen circulation system includes a heated nitrogen input system and a heated nitrogen output system. The heated nitrogen input system is connected to the nitrogen heating system and to the high-pressure cylinder 5, for inputting heated nitrogen into the high-pressure cylinder 5. The heated nitrogen input system includes a heated nitrogen input pipe and a primary warm-up inlet valve 8 and a secondary warm-up inlet valve 9 installed on the heated nitrogen input pipe. The heated nitrogen input pipe is connected to the heater outlet low-temperature nitrogen manual valve 4 and then to the high-pressure cylinder 5. The heated nitrogen output system is connected to the high-pressure cylinder 5 and to the nitrogen heating system, for circulating the heated nitrogen flowing out of the high-pressure cylinder 5 back to the nitrogen heating system.

[0028] Specific embodiment 2 of the device for warming up a steam turbine cylinder using high-temperature nitrogen gas according to the present invention: Based on the above-described technical concept of the present invention, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0029] In this embodiment, as Figure 1 As shown, the heated nitrogen output system includes either a cylinder warming exhaust system or a turbine body condensate exhaust system. The cylinder warming exhaust system is connected to the high-pressure cylinder 5 and then to the nitrogen heating system; the turbine body condensate exhaust system is connected to the high-pressure cylinder 5 and then to the nitrogen heating system. In operation, heated nitrogen is input into the high-pressure cylinder 5, and the heated nitrogen flowing out of the high-pressure cylinder 5 is then output to the nitrogen heating system via either the cylinder warming exhaust system or the turbine body condensate exhaust system.

[0030] To more effectively implement the warm-up of high-pressure cylinder 5, the heated nitrogen output system includes two components: a warm-up exhaust system and a turbine body condensate exhaust system. The warm-up exhaust system is connected to high-pressure cylinder 5 and also to the nitrogen heating system; the turbine body condensate exhaust system is connected to high-pressure cylinder 5 and also to the nitrogen heating system. During operation, heated nitrogen is input into high-pressure cylinder 5, and the heated nitrogen flowing out of high-pressure cylinder 5 simultaneously passes through both the warm-up exhaust system and the turbine body condensate exhaust system before being output to the nitrogen heating system.

[0031] Specifically, the cylinder warming exhaust system is located between the high-pressure exhaust check valve 16 and the high-pressure cylinder 5. It includes a cylinder warming exhaust primary valve 10, a cylinder warming exhaust secondary valve 11, and a cylinder warming exhaust pipe. The cylinder warming exhaust primary valve 10 and the cylinder warming exhaust secondary valve 11 are located on the cylinder warming exhaust pipe and are used to control the output of heated nitrogen gas flowing out of the high-pressure cylinder 5.

[0032] The turbine body drain and venting system includes a turbine body drain pipe venting control valve and a turbine body drain pipe venting pipe. The system is located between the turbine body drain pipe control valve and the condenser 17. The turbine body drain pipe venting control valve is located on the turbine body drain pipe venting pipe, which is connected to both the turbine body drain pipe control valve and the nitrogen heating system. The turbine body drain pipe control valve includes a primary turbine body drain valve 14 and a secondary turbine body drain valve 15; the turbine body drain pipe venting control valve includes a primary turbine body drain pipe venting valve 12 and a secondary turbine body drain pipe venting valve 13, both located on the turbine body drain pipe venting pipe.

[0033] Specific embodiment 3 of the device for warming up a steam turbine cylinder using high-temperature nitrogen gas according to the present invention: Based on the above-described technical concept of the present invention, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0034] In this embodiment, as Figure 1As shown, the heated nitrogen output system also includes a nitrogen venting system, which is connected to both the cylinder warming exhaust system and the turbine body drain exhaust system to reduce the pressure of the heated nitrogen circulating into the nitrogen heating system. Specifically, the nitrogen venting system includes a primary nitrogen venting valve 18 and a secondary nitrogen venting valve 19, which are connected in series and are respectively connected to the cylinder warming exhaust system and the turbine body drain exhaust system. In use, when the heated nitrogen output system only includes the cylinder warming exhaust system, the primary nitrogen vent valve 18 and the secondary nitrogen vent valve 19 reduce the pressure of the heated nitrogen output from the cylinder warming exhaust system; when the heated nitrogen output system only includes the turbine body drain exhaust system, the primary nitrogen vent valve 18 and the secondary nitrogen vent valve 19 reduce the pressure of the heated nitrogen output from the turbine body drain exhaust system; when the heated nitrogen output system includes both the cylinder warming exhaust system and the turbine body drain exhaust system, the primary nitrogen vent valve 18 and the secondary nitrogen vent valve 19 simultaneously reduce the pressure of the heated nitrogen output from both the cylinder warming exhaust system and the turbine body drain exhaust system.

[0035] Specific embodiment 4 of the device for warming up a steam turbine cylinder using high-temperature nitrogen gas according to the present invention: Based on the above-described technical concept of the present invention, or based on the specific embodiments of the present invention described above, another embodiment is provided below.

[0036] In this embodiment, as Figure 1 As shown, the nitrogen circulation system also includes a nitrogen booster system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, and is also connected to the nitrogen heating system to increase the pressure of the heated gas circulating into the nitrogen heating system. The nitrogen booster system includes a nitrogen booster fan 6 and a nitrogen booster fan inlet manual valve 7. In operation, when the pressure of the heated nitrogen output from the cylinder warming exhaust system and the turbine body drain exhaust system is insufficient, the nitrogen booster fan 6 is used to boost the pressure by controlling the nitrogen booster fan inlet manual valve 7, so that the pressure of the heated nitrogen entering the nitrogen electric heater 2 is maintained at the cylinder warming parameters.

[0037] The heated nitrogen input system includes a temperature detection system and a pressure detection system. The pressure detection system is connected to the nitrogen heating system and also to the temperature detection system; the temperature detection system is connected to the pressure detection system and also to the high-pressure cylinder 5. The temperature and pressure detection systems are connected in series to detect the temperature of the heated nitrogen entering the heated nitrogen input system from the nitrogen heating system, and to detect the pressure of the heated nitrogen entering the heated nitrogen input system from the nitrogen heating system. When the pressure is insufficient, the nitrogen input system needs to replenish nitrogen.

[0038] Specific embodiment 1 of the method for warming up a steam turbine cylinder using high-temperature nitrogen according to the present invention: In this embodiment, as Figure 1 As shown, a method for warming up a steam turbine cylinder using high-temperature nitrogen gas, based on the aforementioned apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas, includes the following steps: First, nitrogen is introduced into the nitrogen heating system through the nitrogen input system to obtain heated nitrogen; Then, heated nitrogen is fed into the high-pressure cylinder 5 of the steam turbine through a nitrogen circulation system for warming, and heated nitrogen flowing out of the high-pressure cylinder 5 is transported to the nitrogen heating system to form a warming cycle.

[0039] Specifically, the method of using high-temperature nitrogen gas for turbine cylinder warming includes the following steps: First, nitrogen is introduced into nitrogen electric heater 2 through nitrogen cylinder group 1 to obtain heated nitrogen; Secondly, the heated nitrogen passes through the pressure detection system and the detection system, and enters the high-pressure cylinder 5 through the steam turbine steam pipe in the heated nitrogen input system, thereby warming the high-pressure cylinder 5. Then, the heated nitrogen gas is discharged from the pipeline before the exhaust check valve of the high-pressure cylinder 5 and the pipeline after the drain valve of the high-pressure cylinder 5 body, that is, it is output through the turbine body drain exhaust system and the warm cylinder exhaust system. Finally, the heated nitrogen output is pressurized by the nitrogen booster fan 6 and enters the nitrogen electric heater 2 to maintain the parameters for cylinder warming. This cycle continues, maintaining the high-temperature nitrogen parameters to complete the cylinder warming task for the high-pressure cylinder 5 of the steam turbine.

[0040] From the above description of specific embodiments of the turbine cylinder warming device using high-temperature nitrogen of the present invention, it can be seen that the device includes: a nitrogen input system, a nitrogen heating system, and a nitrogen circulation system. The nitrogen input system is connected to the nitrogen heating system and is used to input nitrogen. The nitrogen heating system is connected to the nitrogen input system and to the nitrogen circulation system and is used to heat the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system and is used to input the heated nitrogen into the high-pressure cylinder 5 of the turbine for warming, and then output the heated nitrogen flowing out of the high-pressure cylinder 5 and circulate it back to the nitrogen heating system. The present invention inputs nitrogen through the nitrogen input system, heats the nitrogen through the nitrogen heating system, and then enters the high-pressure cylinder 5 through the nitrogen circulation system to heat the high-pressure cylinder 5. The heated nitrogen flowing out of the high-pressure cylinder 5 is then output and circulated back to the nitrogen heating system. This cycle maintains the high-temperature nitrogen in the turbine cylinder warming device, thus completing the cylinder warming task of the high-pressure cylinder 5 of the turbine. This invention uses high-temperature circulating nitrogen with good inertness to warm up the high-pressure cylinder 5, which can save the consumption of warm-up steam during the cold start of thermal power units, reduce the start-up time of the unit, and save the fuel consumption for the start-up of the unit.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A device for warming up a steam turbine cylinder using high-temperature nitrogen gas, characterized in that, include: Nitrogen input system, nitrogen heating system, and nitrogen circulation system. The nitrogen input system is connected to the nitrogen heating system and is used to input nitrogen. The nitrogen heating system is connected to the nitrogen input system and the nitrogen circulation system, and is used to heat the input nitrogen. The nitrogen circulation system is connected to the nitrogen heating system and is used to input heated nitrogen into the high-pressure cylinder of the steam turbine for warming, and to output heated nitrogen flowing out of the high-pressure cylinder and circulate it back to the nitrogen heating system. The nitrogen circulation system includes a heated nitrogen input system and a heated nitrogen output system; The heated nitrogen output system includes a cylinder warm-up exhaust system and / or a turbine body condensate exhaust system. The cylinder warming and exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The turbine body's condensate exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The heated nitrogen input system is connected to the nitrogen heating system and to the high-pressure cylinder, and is used to input heated nitrogen into the high-pressure cylinder. The heated nitrogen input system includes a heated nitrogen input pipe and a primary valve and a secondary valve for warming the cylinder, which are installed on the heated nitrogen input pipe. The heated nitrogen input pipe is connected to the nitrogen heating system and to the high-pressure cylinder. The heated nitrogen output system also includes a nitrogen venting system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system to reduce the pressure of the heated nitrogen circulating to the nitrogen heating system. The nitrogen venting system includes a primary nitrogen venting valve and a secondary nitrogen venting valve, which are connected in series and are connected to the cylinder warming exhaust system and the turbine body drain exhaust system, respectively. The nitrogen circulation system also includes a nitrogen booster system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system, and is also connected to the nitrogen heating system to increase the pressure of the heating gas circulating to the nitrogen heating system. The turbine body drain exhaust system includes a turbine body drain pipe exhaust control valve and a turbine body drain pipe exhaust pipe. The turbine body drain exhaust system is located between the turbine body drain pipe control valve and the condenser. The turbine body drain pipe exhaust control valve is located on the turbine body drain pipe exhaust pipe. The turbine body drain pipe exhaust pipe is connected to the turbine body drain pipe control valve and is connected to the nitrogen heating system. The cylinder warm-up exhaust system is located between the high-pressure exhaust check valve and the high-pressure cylinder, and includes a primary cylinder warm-up exhaust valve, a secondary cylinder warm-up exhaust valve, and a cylinder warm-up exhaust pipe.

2. The apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas according to claim 1, characterized in that, The heated nitrogen output system is connected to the high-pressure cylinder and to the nitrogen heating system, and is used to circulate the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system.

3. The apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas according to claim 2, characterized in that, The nitrogen heating input system includes a temperature detection system and a pressure detection system. The pressure detection system is connected to the nitrogen heating system and to the temperature detection system. The temperature detection system is connected to the pressure detection system and to the high-pressure cylinder.

4. The apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas according to claim 1, characterized in that, The nitrogen heating system includes a nitrogen electric heater, a heater inlet low-temperature nitrogen manual valve, and a heater outlet low-temperature nitrogen manual valve. The nitrogen electric heater is located between the heater inlet low-temperature nitrogen manual valve and the heater outlet low-temperature nitrogen manual valve.

5. A method for warming up a steam turbine cylinder using high-temperature nitrogen gas, characterized in that, The apparatus for warming up a steam turbine cylinder using high-temperature nitrogen gas according to any one of claims 1-4 includes the following steps: S1, nitrogen is introduced into the nitrogen heating system through the nitrogen input system to obtain heated nitrogen; S2, heated nitrogen is fed into the high-pressure cylinder of the steam turbine through the nitrogen circulation system for warming, and the heated nitrogen flowing out of the high-pressure cylinder is transported to the nitrogen heating system to form a warming cycle.

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