Device and method for steam turbine cylinder warming through high-temperature nitrogen

Abstract

The invention relates to the technical field of steam turbine cylinder warming, in particular to a device and method for conducting steam turbine cylinder warming through high-temperature nitrogen. The device for heating the cylinder of the steam turbine through the high-temperature nitrogen comprises a nitrogen input system, a nitrogen heating system and a nitrogen circulating system, and the nitrogen input system is connected to the nitrogen heating system and used for inputting nitrogen; the nitrogen heating system is connected to the nitrogen input system and the nitrogen circulating system and is used for heating input nitrogen; the nitrogen circulation system is connected with the nitrogen heating system and used for inputting the heated nitrogen into a high-pressure cylinder of the steam turbine to be heated and outputting and circulating the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system. The high-pressure cylinder is warmed through the high-temperature circulating nitrogen with good inertia, consumption of cylinder warming steam in the cold-state starting process of the thermal power generating unit can be saved, the starting time of the unit is shortened, and consumption of starting fuel of the unit is saved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbine cylinder warming, and in particular to a device and method for steam turbine cylinder warming using high-temperature nitrogen. Background Art

[0002] At present, during the cold start of high-pressure and medium-pressure cylinders or the start of medium-pressure cylinders, the high-pressure cylinders of steam turbines of thermal power units of various capacities must be warmed up. Warming up the cylinders requires the use of steam with certain parameters, which is obtained by burning No. 0 diesel and coal in the boiler. This process takes a long time (the warm-up process of some units with poor vibration takes longer), resulting in energy waste. According to incomplete statistics, the fuel cost consumed by the cold start of a 600,000-class thermal power unit ranges from about 1.2 million to 2.4 million yuan. According to the estimate that the warm-up time accounts for about 1 / 4 of the total cold start, the fuel cost consumed by the warm-up is about 300,000 to 600,000 yuan. According to the calculation that the two 600,000-class units in the whole plant are cold-started 4 times a year, the annual fuel cost consumed by the warm-up is about 1.2 million to 2.4 million yuan.

[0003] The main function of traditional steam turbine cylinder warming is to heat the rotor, stator, inner cylinder, outer cylinder, and main valves inside the steam turbine through high-temperature and high-pressure steam, and closely monitor the expansion difference and cylinder expansion of the steam turbine to ensure that the steam turbine avoids friction when rotating at high speed. At present, energy conservation and emission reduction have entered the deep water zone, and energy conservation during the unit startup process is also very important. In order to save the fuel consumption required for cylinder warming during the cold start of thermal power units, it is necessary to seek a reliable, energy-saving and efficient cylinder warming system. Summary of the invention

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

[0005] In order to solve the above problems, the present invention proposes a device for warming the cylinder of a steam turbine using high-temperature nitrogen. The technical solution adopted is: A device for warming the cylinder of a steam turbine using 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 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 the heated nitrogen into the high-pressure cylinder of the steam turbine for warming, and output the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system for circulation.

[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 connected to the high-pressure cylinder, and is used to input the 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 for outputting the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system for circulation.

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

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

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

[0010] Furthermore, the nitrogen circulation system also includes a nitrogen boosting system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system respectively, and is connected to the nitrogen heating system for increasing the pressure of the heating gas circulated to the nitrogen heating system.

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

[0012] Furthermore, 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 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 comprises a nitrogen electric heater, a low-temperature nitrogen manual valve at a heater inlet and a low-temperature nitrogen manual valve at a heater outlet, and the nitrogen electric heater is arranged between the low-temperature nitrogen manual valve at a heater inlet and the low-temperature nitrogen manual valve at a heater outlet.

[0014] The present invention also proposes a method for warming up a steam turbine cylinder using high-temperature nitrogen. Based on the above-mentioned device for warming up a steam turbine cylinder using high-temperature nitrogen, the method comprises the following steps: S1, inputting nitrogen into a nitrogen heating system through a nitrogen input system to obtain heated nitrogen; S2, the heated nitrogen is input 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 invention has the following beneficial effects: The present invention is an improved invention. The present invention inputs nitrogen through a nitrogen input system, and after the nitrogen is heated by a nitrogen heating system, the nitrogen enters the high-pressure cylinder of the steam turbine through a nitrogen circulation system to heat the high-pressure cylinder, and the heated nitrogen flowing out of the high-pressure cylinder is output and circulated to the nitrogen heating system to form a warm cycle. In this way, the high-temperature nitrogen of the steam turbine cylinder warming device can be maintained, and the high-pressure cylinder in the steam turbine can complete the cylinder warming task. At the same time, the present invention warms the high-pressure cylinder through high-temperature circulating nitrogen with good inertness, which can save the consumption of cylinder warming steam during the cold start of the thermal power unit, reduce the unit start-up time, save the consumption of unit start-up fuel, and reduce 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 connected to the high-pressure cylinder, and is used to input the 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 output the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system for circulation, so as to form a high-temperature and high-pressure nitrogen circulation.

[0017] The heated nitrogen output system includes a cylinder warming exhaust system or a turbine body drain exhaust system. The cylinder warming exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The steam turbine body drain exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system. Only one of the systems is needed to achieve the heating of the high-pressure cylinder.

[0018] The heated nitrogen output system includes two types: a warm cylinder exhaust system and a turbine body drain exhaust system. The cylinder warming exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The steam turbine body drain exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system, and the two systems circulate simultaneously, making the heating of the high-pressure cylinder more effective.

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

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

[0021] 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 to the temperature detection system; the temperature detection system is connected to the pressure detection system and to the high-pressure cylinder. Through pressure detection, the nitrogen of the device can be replenished at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of a device for warming a steam turbine cylinder using high-temperature nitrogen according to the present invention; In the figure, 1. nitrogen cylinder group, 2. nitrogen electric heater, 3. low-temperature nitrogen manual valve at heater inlet, 4. low-temperature nitrogen manual valve at heater outlet, 5. high-pressure cylinder, 6. nitrogen booster fan, 7. nitrogen booster fan inlet manual valve, 8. warm cylinder air intake primary valve, 9. warm cylinder air intake secondary valve, 10. warm cylinder exhaust primary valve, 11. warm cylinder exhaust secondary valve, 12. turbine body drain pipe exhaust primary valve, 13. turbine body drain pipe exhaust secondary valve, 14. turbine body drain primary valve, 15. turbine body drain secondary valve, 16. high-discharge check valve, 17. condenser, 18. nitrogen release primary valve, 19. nitrogen release secondary valve. DETAILED DESCRIPTION

[0023] As cited in the background technology, the high-temperature and high-pressure steam cylinder warming in the prior art has high energy waste and high cost. Therefore, the present invention provides a device for warming the cylinder of a steam turbine using high-temperature nitrogen, including: 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 connected to 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 5 of the steam turbine for warming, and outputting the heated nitrogen flowing out of the high-pressure cylinder 5 for circulation to the nitrogen heating system. The present invention inputs nitrogen through the nitrogen input system, and after the nitrogen is heated by the nitrogen heating system, the nitrogen enters the high-pressure cylinder 5 through the nitrogen circulation system to heat the high-pressure cylinder 5 and outputs the heated nitrogen flowing out of the high-pressure cylinder 5 for circulation to the nitrogen heating system, and in this way, the high-temperature nitrogen of the device for warming the cylinder of the steam turbine is maintained, and the high-pressure cylinder 5 of the steam turbine is completed. The present invention warms up the high-pressure cylinder 5 by using high-temperature circulating nitrogen with good inertness, which can save the consumption of warming steam during the cold start of the thermal power unit, reduce the unit start-up time, and save the consumption of unit start-up fuel.

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

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] Specific embodiment 1 of the device for warming the cylinder of a steam turbine using high-temperature nitrogen of the present invention: In this embodiment, Figure 1As shown, a device for warming the cylinder of a steam turbine 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 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 5 of the steam turbine for warming, and outputting the heated nitrogen flowing out of the high-pressure cylinder 5 to the nitrogen heating system for circulation. Among them, the nitrogen input system includes a plurality of nitrogen cylinder groups 1 for replenishing and inputting nitrogen. The nitrogen heating system includes a nitrogen electric heater 2, a low-temperature nitrogen manual valve 3 for the heater inlet, and a low-temperature nitrogen manual valve 4 for the heater outlet. The nitrogen electric heater 2 is arranged between the low-temperature nitrogen manual valve 3 for the heater inlet and the low-temperature nitrogen manual valve 4 for the heater outlet. The low-temperature nitrogen manual valve 3 for the heater inlet is connected to the nitrogen input system, and the low-temperature nitrogen manual valve 4 for the heater outlet is connected to the nitrogen circulation system. When 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 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 warm 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, and is used to input the heated nitrogen into the high-pressure cylinder 5; wherein the heated nitrogen input system includes a heated nitrogen input pipeline and a warm cylinder air intake primary valve 8 and a warm cylinder air intake secondary valve 9 arranged on the heated nitrogen input pipeline, and the heated nitrogen input pipeline is connected to the low-temperature nitrogen manual valve 4 at the heater outlet and is connected 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, and is used to output the heated nitrogen flowing out of the high-pressure cylinder 5 to the nitrogen heating system.

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

[0029] In this embodiment, Figure 1 As shown, the heated nitrogen output system includes a cylinder warming exhaust system or a turbine body drain exhaust system, the cylinder warming exhaust system is connected to the high-pressure cylinder 5 and connected to the nitrogen heating system; the turbine body drain exhaust system is connected to the high-pressure cylinder 5 and connected to the nitrogen heating system. When in use, after the heated nitrogen is input into the high-pressure cylinder 5, the heated nitrogen flowing out of the high-pressure cylinder 5 is output to the nitrogen heating system through the cylinder warming exhaust system or the turbine body drain exhaust system.

[0030] In order to more effectively implement the high-pressure cylinder 5 warming, the heated nitrogen output system includes two types: a warming cylinder exhaust system and a turbine body drain exhaust system. The warming cylinder exhaust system is connected to the high-pressure cylinder 5 and connected to the nitrogen heating system; the turbine body drain exhaust system is connected to the high-pressure cylinder 5 and connected to the nitrogen heating system. When in use, after the heated nitrogen is input into the high-pressure cylinder 5, the heated nitrogen flowing out of the high-pressure cylinder 5 is simultaneously output to the nitrogen heating system through the warming cylinder exhaust system and the turbine body drain exhaust system.

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

[0032] The steam turbine body drain exhaust system includes a steam turbine body drain pipe exhaust control valve and a steam turbine body drain pipe exhaust pipeline. The steam turbine body drain exhaust system is arranged between the steam turbine body drain control valve and the condenser 17. The steam turbine body drain pipe exhaust control valve is arranged on the steam turbine body drain pipe exhaust pipeline. The steam turbine body drain pipe exhaust pipeline is connected to the steam turbine body drain control valve and connected to the nitrogen heating system. Among them, the steam turbine body drain control valve includes a steam turbine body drain primary valve 14 and a steam turbine body drain secondary valve 15; the steam turbine body drain pipe exhaust control valve includes a steam turbine body drain pipe exhaust primary valve 12 and a steam turbine body drain pipe exhaust secondary valve 13, which are arranged on the steam turbine body drain pipe exhaust pipeline.

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

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

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

[0036] In this embodiment, Figure 1 As shown, the nitrogen circulation system also includes a nitrogen boosting system, which is connected to the cylinder warming exhaust system and the steam turbine body drain exhaust system, and is connected to the nitrogen heating system, for increasing the pressure of the heated gas circulated to the nitrogen heating system. The nitrogen boosting system includes a nitrogen boosting fan 6 and a nitrogen boosting fan inlet manual valve 7. When in use, when the pressure of the heated nitrogen output from the cylinder warming exhaust system and the steam turbine body drain exhaust system is insufficient, the nitrogen boosting fan 6 is used to increase the pressure by controlling the nitrogen boosting fan inlet manual valve 7, so that the pressure of the heated nitrogen entering the nitrogen electric heater 2 maintains 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 to the temperature detection system. The temperature detection system is connected to the pressure detection system and to the high-pressure cylinder 5. The temperature detection system and the pressure detection system 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 supplement the nitrogen.

[0038] Specific embodiment 1 of the method for warming the cylinder of a steam turbine using high-temperature nitrogen of the present invention: In this embodiment, Figure 1 As shown, a method for warming up a steam turbine cylinder using high-temperature nitrogen is based on the above-mentioned device for warming up a steam turbine cylinder using high-temperature nitrogen, and comprises the following steps: Firstly, nitrogen is input into a nitrogen heating system through a nitrogen input system to obtain heated nitrogen; Then, the heated nitrogen is input into the high-pressure cylinder 5 of the steam turbine 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 warm cycle.

[0039] Specifically, the method for warming up the cylinder of a steam turbine using high-temperature nitrogen comprises the following steps: First, nitrogen is input into the nitrogen electric heater 2 through the 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 guide pipe in the heated nitrogen input system, thereby warming the high-pressure cylinder 5; Then, the heated nitrogen is discharged from the pipeline before the exhaust check valve of the high-pressure cylinder 5 and the pipeline after the steam trap valve of the high-pressure cylinder 5 body, that is, it is output through the steam turbine body steam trap exhaust system and the warm cylinder exhaust system; Finally, the output heated nitrogen is pressurized by the nitrogen booster fan 6 and enters the nitrogen electric heater 2 to maintain the cylinder warming parameters. In this way, the high temperature nitrogen parameters are maintained to complete the cylinder warming task of the steam turbine high pressure cylinder 5.

[0040] Through the above description of the specific embodiment of the device for warming the cylinder of a steam turbine using high-temperature nitrogen of the present invention, it can be seen that the device for warming the cylinder of a steam turbine using high-temperature nitrogen of the present invention 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 connected to 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 5 of the steam turbine for warming, and outputting the heated nitrogen flowing out of the high-pressure cylinder 5 for circulation to the nitrogen heating system. The present invention inputs nitrogen through the nitrogen input system, and after the nitrogen is heated by the nitrogen heating system, the nitrogen enters the high-pressure cylinder 5 through the nitrogen circulation system to heat the high-pressure cylinder 5, and outputs the heated nitrogen flowing out of the high-pressure cylinder 5 for circulation to the nitrogen heating system, and in this way, the high-temperature nitrogen of the device for warming the cylinder of the steam turbine is maintained, and the high-pressure cylinder 5 of the steam turbine is completed. The present invention warms up the high-pressure cylinder 5 by using high-temperature circulating nitrogen with good inertness, which can save the consumption of warming steam during the cold start of the thermal power unit, reduce the unit start-up time, and save the consumption of unit start-up fuel.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A device for warming up a steam turbine using high-temperature nitrogen, 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 the heated nitrogen into the high-pressure cylinder of the steam turbine for warming, and output the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system for circulation.

2. The device for warming up a steam turbine using high temperature nitrogen according to claim 1, characterized in that: 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 connected to the high-pressure cylinder, and is used to input the 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 for outputting the heated nitrogen flowing out of the high-pressure cylinder to the nitrogen heating system for circulation.

3. The device for warming up a steam turbine using high temperature nitrogen according to claim 2, characterized in that: The heated nitrogen output system includes a cylinder warming exhaust system or a turbine body drain exhaust system. The cylinder warming exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The steam turbine body drain exhaust system is connected to the high-pressure cylinder and connected to the nitrogen heating system.

4. The device for warming up a steam turbine using high temperature nitrogen according to claim 2, characterized in that: The heated nitrogen output system includes two types: a warm cylinder exhaust system and a turbine body drain exhaust system. The cylinder warming exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system; The steam turbine body drain exhaust system is connected to the high-pressure cylinder and to the nitrogen heating system.

5. The device for warming up a steam turbine using high temperature nitrogen according to claim 4, characterized in that: The heated nitrogen output system also includes a nitrogen release system, which is respectively connected to the cylinder warming exhaust system and the turbine body drain exhaust system to reduce the pressure of the heated nitrogen circulated in the nitrogen heating system.

6. The device for warming up a steam turbine using high temperature nitrogen according to claim 4, characterized in that: The nitrogen circulation system also includes a nitrogen boosting system, which is connected to the cylinder warming exhaust system and the turbine body drain exhaust system respectively, and is connected to the nitrogen heating system for increasing the pressure of the heating gas circulated to the nitrogen heating system.

7. The device for warming up a steam turbine cylinder using high temperature nitrogen according to claim 5 or 6, characterized in that: The steam turbine body drain exhaust system comprises a steam turbine body drain pipe exhaust control valve and a steam turbine body drain pipe exhaust pipeline. The steam turbine body drain exhaust system is arranged between the steam turbine body drain control valve and the condenser. The steam turbine body drain pipe exhaust control valve is arranged on the steam turbine body drain pipe exhaust pipeline. The steam turbine body drain pipe exhaust pipeline is connected to the steam turbine body drain control valve and connected to the nitrogen heating system.

8. The device for warming up a steam turbine using high temperature nitrogen according to claim 2, characterized in that: 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 to the temperature detection system; the temperature detection system is connected to the pressure detection system and to the high-pressure cylinder.

9. The device for warming up a steam turbine using high temperature nitrogen according to claim 1, characterized in that: The nitrogen heating system comprises a nitrogen electric heater, a low-temperature nitrogen manual valve at a heater inlet and a low-temperature nitrogen manual valve at a heater outlet, wherein the nitrogen electric heater is arranged between the low-temperature nitrogen manual valve at a heater inlet and the low-temperature nitrogen manual valve at a heater outlet.

10. A method for warming up a steam turbine using high temperature nitrogen, characterized in that: The device for warming the cylinder of a steam turbine using high-temperature nitrogen according to any one of claims 1 to 9 comprises the following steps: S1, inputting nitrogen into a nitrogen heating system through a nitrogen input system to obtain heated nitrogen; S2, the heated nitrogen is input 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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