Steam turbine and steam turbine quick start preheating system

Abstract

The utility model belongs to the technical field of steam turbines, and discloses a steam turbine and a quick start preheating system of the steam turbine. The steam turbine comprises an outer cylinder, a first confluence cavity, a second confluence cavity and a plurality of independent steam channels are arranged in the outer cylinder, the first confluence cavity is located at one end of the outer cylinder in the axial direction, the second confluence cavity is located at the other end of the outer cylinder in the axial direction, and the steam channels are arranged between the first confluence cavity and the second confluence cavity and arranged in the circumferential direction of the outer cylinder. One end of the steam channel communicates with the first confluence cavity, and the other end of the steam channel communicates with the second confluence cavity. According to the steam turbine, the steam channel is integrated in the outer cylinder to preheat the outer cylinder, the temperature difference of the outer cylinder is effectively reduced, meanwhile, the heating speed of the outer cylinder is high, and the starting speed and operation safety of the steam turbine are improved.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, and in particular to a steam turbine and a steam turbine rapid start-up preheating system. Background Technology

[0002] The current development of power systems requires steam turbines to have rapid and frequent start-up capabilities to support grid-connected power generation from new energy sources. During the steam turbine startup process, there is a temperature difference between the moving and stationary components (rotor and cylinder). An excessively rapid startup rate will increase the temperature difference between the rotor and cylinder, causing significant changes in the gap (expansion difference) between them. When the temperature difference exceeds a certain value, it will cause rubbing between the rotor and cylinder, leading to problems such as vibration and rotor blade breakage, seriously threatening the safe operation of the unit.

[0003] To address the issue of temperature difference between moving and stationary components during turbine startup, some turbines introduce steam between the inner and outer cylinders. However, research has revealed that during temporary turbine shutdowns, the temperature difference between the inner cylinder and rotor is minimal; the significant temperature difference lies in the outer cylinder. Therefore, while introducing steam between the inner and outer cylinders reduces the temperature difference between the rotor and the inner and outer cylinders to some extent, it results in slower heating of the outer cylinder. Furthermore, the temperature difference within the outer cylinder itself (between the inner and outer walls) remains high, making it difficult to meet the requirements for rapid startup under safe operating conditions.

[0004] Therefore, there is an urgent need to propose a steam turbine and a steam turbine rapid start-up preheating system to solve the above-mentioned technical problems. Utility Model Content

[0005] According to one aspect of the present invention, a steam turbine is provided that preheats the outer cylinder by integrating a steam channel inside the outer cylinder. This effectively reduces the temperature difference of the outer cylinder while increasing the heating rate of the outer cylinder, thereby improving the start-up speed and operational safety of the steam turbine.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A steam turbine includes an outer cylinder. The outer cylinder has a first confluence chamber, a second confluence chamber, and multiple independent steam passages. The first confluence chamber is located at one end of the outer cylinder in the axial direction, and the second confluence chamber is located at the other end of the outer cylinder in the axial direction. The multiple steam passages are arranged between the first confluence chamber and the second confluence chamber and are arranged circumferentially along the outer cylinder. One end of each steam passage is connected to the first confluence chamber, and the other end of each steam passage is connected to the second confluence chamber.

[0008] Optionally, the outer cylinder includes an inner wall and an outer wall, the inner wall and the outer wall forming a sandwich cavity. Along the axial direction of the outer cylinder, a first sealing plate and a second sealing plate are respectively provided at both ends of the outer cylinder to seal the sandwich cavity. Multiple partitions are provided in the sandwich cavity, and the multiple partitions divide part of the sandwich cavity into multiple steam channels. The first end of the multiple partitions and the first sealing plate form the first confluence cavity, and the second end of the multiple partitions and the second sealing plate form the second confluence cavity.

[0009] Optionally, the inner wall, the outer wall, and the partition form an integral structure.

[0010] According to another aspect of the present invention, the present invention also provides a steam turbine rapid start-up preheating system, including a heating module, a condensate drain module, and the steam turbine described in any of the above technical solutions; the heating module includes a steam generator, the steam outlet of the steam generator being connected to a first manifold through a steam inlet pipe, and the condensate drain module includes a condensate drain pipe, one end of which is connected to a second manifold.

[0011] Optionally, a first valve is provided on the steam inlet pipeline to control the opening and closing of the steam inlet pipeline, and a second valve is provided on the drain pipeline to control the opening and closing of the drain pipeline.

[0012] Optionally, the turbine rapid start-up preheating system further includes an external steam supply pipeline, one end of which is connected to the inlet of the first valve, and a third valve is provided on the external steam supply pipeline for controlling the on / off state of the external steam supply pipeline.

[0013] Optionally, a first temperature detection element is provided on the steam inlet pipe, which is used to detect the steam temperature in the steam inlet pipe and is located at the inlet of the first valve; a second temperature detection element is provided on the outer cylinder, which is used to detect the temperature of the outer cylinder.

[0014] Optionally, the turbine rapid start-up preheating system further includes an exhaust pipe, one end of which is connected to the second manifold and the other end is connected to the external steam supply pipe. A fourth valve is provided on the exhaust pipe to control the opening and closing of the exhaust pipe.

[0015] Optionally, the heating module further includes a water supply tank and a water supply pump, wherein the outlet of the water supply tank is connected to the inlet of the water supply pump, and the outlet of the water supply pump is connected to the inlet of the steam generator.

[0016] Optionally, the heating module further includes a boiler, a high-temperature molten salt storage tank, a low-temperature molten salt storage tank, and a molten salt pump; the molten salt outlet of the boiler is connected to the inlet of the high-temperature molten salt storage tank, the outlet of the high-temperature molten salt storage tank is connected to the molten salt inlet of the steam generator, the molten salt outlet of the steam generator is connected to the inlet of the low-temperature molten salt storage tank, the outlet of the low-temperature molten salt storage tank is connected to the inlet of the molten salt pump, and the outlet of the molten salt pump is connected to the molten salt inlet of the boiler.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides a steam turbine, including an outer cylinder. The outer cylinder contains a first manifold, a second manifold, and multiple independent steam channels. After steam is delivered to the first manifold, it enters different steam channels and exchanges heat with the outer cylinder. The steam condenses into water, which then enters and exits the second manifold. In other words, the outer cylinder of this steam turbine can be heated by introducing steam, reducing the temperature difference between the outer cylinder and the rotor, thus improving the safety of turbine operation. Furthermore, the large contact area between the steam and the outer cylinder allows for a faster heating rate, improving the turbine's start-up speed and better meeting the higher temperature rise requirements during rapid startup.

[0019] By setting multiple independent steam channels around the outer cylinder, it is beneficial to increase the steam flow rate, thereby increasing the steam heating rate of the outer cylinder, and also to improve the heating uniformity of the outer cylinder.

[0020] This invention also provides a rapid start-up preheating system for steam turbines, comprising a heating module, a condensate drain module, and the aforementioned steam turbine. Because this rapid start-up preheating system utilizes the aforementioned steam turbine, it offers both high rapid start-up speed and high operational safety. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional view of the outer cylinder provided in Embodiment 1 of this utility model. Figure 1 ;

[0023] Figure 2 This is a cross-sectional view of the outer cylinder provided in Embodiment 1 of this utility model. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the turbine rapid start-up preheating system provided in Embodiment 2 of this utility model.

[0025] In the picture:

[0026] 1. Steam turbine; 100. Outer cylinder; 1011. Outer wall; 1012. Inner wall; 1013. Baffle; 101. First manifold; 102. Second manifold; 103. Steam passage;

[0027] 2. Heating module; 21. Steam generator; 22. Steam inlet pipeline; 23. Makeup water tank; 24. Makeup water pump; 25. Boiler; 26. High-temperature molten salt storage tank; 27. Low-temperature molten salt storage tank; 28. Molten salt pump; 29. ​​Fifth valve;

[0028] 3. Drainage module; 31. Drainage piping;

[0029] 4. First valve; 5. Second valve; 6. Steam external supply pipeline; 7. Third valve; 8. First temperature sensor; 9. Second temperature sensor; 10. Exhaust pipeline; 11. Fourth valve. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] Example 1

[0035] This embodiment provides a steam turbine that preheats the outer cylinder by integrating a steam channel inside the outer cylinder. This effectively reduces the temperature difference of the outer cylinder while increasing the heating rate of the outer cylinder, thereby improving the turbine's start-up speed and operational safety.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the steam turbine includes an outer cylinder 100, which contains a first manifold 101, a second manifold 102, and multiple independent steam passages 103. The first manifold 101 is located at one end of the outer cylinder 100 in the axial direction, and the second manifold 102 is located at the other end of the outer cylinder 100 in the axial direction. Multiple steam passages 103 are arranged between the first manifold 101 and the second manifold 102 and are circumferentially arranged around the outer cylinder 100. One end of each steam passage 103 communicates with the first manifold 101, and the other end communicates with the second manifold 102.

[0037] It is understandable that the first manifold 101 and the second manifold 102 are annular, and multiple steam channels 103 uniformly cover the outer cylinder 100 along the circumference of the outer cylinder 100 to ensure uniform heating in all parts of the outer cylinder 100.

[0038] It is understood that the first manifold 101 and the second manifold 102 are used to combine steam or condensate. Exemplarily, in this embodiment, steam for heating the outer cylinder 100 is continuously supplied to the first manifold 101. The steam in the first manifold 101 flows autonomously into each steam channel 103 and along the extension direction of the steam channel 103. During the flow, the steam exchanges heat with the outer cylinder 100, raising its temperature to achieve the purpose of heating the outer cylinder 100. After heat exchange, the steam condenses into water, which then enters the second manifold 102 from the other end of the steam channel 103 and is finally discharged from the second manifold 102. Of course, in other embodiments, steam can also be input from the second manifold 102 and output from the first manifold 101, depending on actual needs; this application does not impose specific limitations.

[0039] The steam turbine provided in this embodiment heats the outer cylinder 100 by integrating a steam channel 103 within the outer cylinder 100. This results in a larger contact area between the steam and the outer cylinder 100, increasing the temperature rise rate of the outer cylinder 100. This, in turn, facilitates a faster turbine start-up, meeting the higher requirements for temperature rise rate during rapid startup. Furthermore, the accelerated temperature rise of the outer cylinder 100 reduces the temperature difference between the outer cylinder 100 and the rotor, improving the turbine's operational safety. Additionally, by providing multiple independent steam channels 103 circumferentially around the outer cylinder 100, the steam flow rate is increased, thereby enhancing the heating rate of the outer cylinder 100, and also improving the uniformity of heating the outer cylinder 100.

[0040] It is worth noting that when the temperature of the outer cylinder 100 is the same as the temperature of the steam, the steam remains in steam form after entering the second manifold 102. That is, during the heating stage of the outer cylinder 100, the second manifold 102 contains condensate; during the heat preservation stage of the outer cylinder 100, the second manifold 102 contains steam.

[0041] Optionally, see [link to relevant documentation] Figure 1 and Figure 2 In this embodiment, the outer cylinder 100 includes an inner wall 1012 and an outer wall 1011, which together form a sandwich cavity. Along the axial direction of the outer cylinder 100, a first sealing plate and a second sealing plate are respectively provided at both ends of the outer cylinder 100 to seal the sandwich cavity. Multiple partitions 1013 are provided within the sandwich cavity, dividing a portion of the sandwich cavity into multiple steam channels 103. A first confluence cavity 101 is formed between the first end of each partition 1013 and the first sealing plate, and a second confluence cavity 102 is formed between the second end of each partition 1013 and the second sealing plate. This outer cylinder 100 has a simple structure and is easy to manufacture.

[0042] It is understood that the outer wall 1011 has an opening connecting the outside world and the first manifold 101 to ensure that steam can enter the first manifold 101. The outer wall 1011 also has an opening connecting the outside world and the second manifold 102 to ensure that steam or condensate in the second manifold 102 can be discharged.

[0043] Optionally, see [link to relevant documentation] Figure 2 One side of the partition 1013 is sealed to the inner wall 1012, and the other side of the partition 1013 is sealed to the outer wall 1011.

[0044] Furthermore, the inner wall 1012, the outer wall 1011, and the partition 1013 form an integrated structure. This arrangement ensures the reliability of the partition 1013 in dividing the interlayer cavity into multiple independent steam channels 103, and also facilitates processing.

[0045] Example 2

[0046] This embodiment provides a steam turbine rapid start-up preheating system, which has a high rapid start-up rate and high operational safety.

[0047] Specifically, such as Figure 3 As shown, the turbine rapid start-up preheating system includes a heating module 2, a condensate drain module 3, and the turbine 1 provided in Embodiment 1. The heating module 2 includes a steam generator 21, the steam outlet of which is connected to the first manifold 101 via a steam inlet pipe 22. The condensate drain module 3 includes a condensate drain pipe 31, one end of which is connected to the second manifold 102.

[0048] The turbine rapid start-up preheating system can continuously supply steam to the first manifold 101 through the steam generator 21. The steam after heat exchange with the outer cylinder 100 can be discharged through the drain pipe 31, so that the steam can continuously heat the outer cylinder 100 until the temperature of the outer cylinder 100 is the same as the steam temperature.

[0049] It is understandable that the steam temperature should be the same as the target temperature that the outer cylinder 100 needs to achieve, and the steam temperature can be regulated by controlling the power of the steam generator 21 according to actual needs.

[0050] Optionally, see [link to relevant documentation] Figure 3 To facilitate the control of steam input and output, a first valve 4 is installed on the steam inlet pipe 22, and a second valve 5 is installed on the drain pipe 31. The first valve 4 controls the opening and closing of the steam inlet pipe 22, and the second valve 5 controls the opening and closing of the drain pipe 31. That is, when the turbine 1 is shut down, to prevent the outer cylinder 100 from becoming too cold, the first valve 4 and the second valve 5 can be opened to heat the outer cylinder 100, ensuring that the temperature of the turbine 1 remains at the target temperature for rapid startup during shutdown, thus preparing for the start-up of the turbine 1.

[0051] Optionally, the first valve 4 can be an electric valve, and the second valve 5 can also be an electric valve, which facilitates remote control.

[0052] It is worth noting that during normal operation of turbine 1, steam generator 21 can operate continuously to ensure that steam can be quickly supplied to outer cylinder 100 when turbine 1 is shut down. However, outer cylinder 100 does not require heating during normal operation of turbine 1; therefore, see [link to relevant documentation]. Figure 3 A steam external supply pipeline 6 can be set up to deliver the steam generated by the steam generator 21 during this process to other equipment that needs to be heated, thereby improving energy utilization efficiency. Exemplarily, in this embodiment, one end of the steam external supply pipeline 6 is connected to the inlet of the first valve 4, and a third valve 7 is provided on the steam external supply pipeline 6. The third valve 7 is used to control the opening and closing of the steam external supply pipeline 6.

[0053] Understandably, during normal operation of turbine 1, the third valve 7 should be opened, and the first valve 4 and the second valve 5 should be closed. During turbine 1 shutdown, the first valve 4 and the second valve 5 should be opened, and the third valve 7 should be closed.

[0054] Optionally, the third valve 7 can be an electric valve for easy remote control.

[0055] Further, see also Figure 3 A first temperature sensor 8 is installed on the steam inlet pipe 22 to detect the steam temperature inside the steam inlet pipe 22. The first temperature sensor 8 is located at the inlet of the first valve 4. A second temperature sensor 9 is installed on the outer cylinder 100 to detect the temperature of the outer cylinder 100. By installing the first temperature sensor 8 and the second temperature sensor 9, the temperatures of the steam inlet pipe 22 and the outer cylinder 100 can be detected.

[0056] For example, when the steam turbine 1 is shut down, the power of the steam generator 21 is first controlled until the steam temperature in the steam inlet pipe 22 detected by the first temperature detector 8 is the same as the temperature of the outer cylinder 100 detected by the second temperature detector 9. Then the first valve 4 is opened, and the power of the steam generator 21 is controlled again to make the steam temperature continue to rise until the temperature of the outer cylinder 100 detected by the second temperature detector 9 is equal to the target temperature. Then the steam generator 21 is controlled to keep the steam temperature constant to achieve heat preservation of the outer cylinder 100.

[0057] Optionally, in one possible embodiment, both the first temperature detection element 8 and the second temperature detection element 9 are temperature sensors.

[0058] Optionally, see [link to relevant documentation] Figure 3 The turbine rapid start-up preheating system also includes an exhaust pipe 10. One end of the exhaust pipe 10 is connected to the second manifold 102, and the other end is connected to the external steam supply pipe 6. A fourth valve 11 is provided on the exhaust pipe 10 to control the opening and closing of the exhaust pipe 10. Specifically, during the turbine 1 shutdown process, when the temperature of the outer cylinder 100 reaches the target temperature, the temperature of the steam passing through the first manifold 101, the steam passage 103, and the second manifold 102 will remain unchanged. Directly discharging this part of the steam would result in energy waste. Therefore, the second valve 5 can be closed and the fourth valve 11 can be opened to transport the steam to the external steam supply pipe 6 through the exhaust pipe 10 for reuse, thereby improving energy utilization efficiency.

[0059] Optionally, the fourth valve 11 can be an electric valve for easy remote control.

[0060] Further, see also Figure 3The heating module 2 also includes a water supply tank 23 and a water supply pump 24. The outlet of the water supply tank 23 is connected to the inlet of the water supply pump 24, and the outlet of the water supply pump 24 is connected to the inlet of the steam generator 21. Through the water supply tank 23 and the water supply pump 24, water can be continuously supplied to the steam generator 21 to ensure that the steam generator 21 can continuously generate steam.

[0061] Optionally, the water supply tank 23 can be connected to the water inlet of the steam generator 21 via a water pipe, and the water pipe is equipped with a water supply pump 24 and a fifth valve 29. By controlling the opening and closing of the fifth valve 29, the flow of the water pipe can be controlled, so as to control whether the water supply tank 23 supplies water to the steam generator 21 according to the actual working conditions.

[0062] Optionally, the fifth valve 29 can be an electric valve for easy remote control.

[0063] Further, see also Figure 3 In this embodiment, the heating module 2 further includes a boiler 25, a high-temperature molten salt storage tank 26, a low-temperature molten salt storage tank 27, and a molten salt pump 28. The molten salt outlet of the boiler 25 is connected to the inlet of the high-temperature molten salt storage tank 26, the outlet of the high-temperature molten salt storage tank 26 is connected to the molten salt inlet of the steam generator 21, the molten salt outlet of the steam generator 21 is connected to the inlet of the low-temperature molten salt storage tank 27, the outlet of the low-temperature molten salt storage tank 27 is connected to the inlet of the molten salt pump 28, and the outlet of the molten salt pump 28 is connected to the molten salt inlet of the boiler 25.

[0064] It is understandable that molten salt thermal energy storage technology is generally used in generator sets to improve the load ramp-up rate of the generator set; this is an existing technology. The turbine rapid start-up preheating system provided in this embodiment utilizes this technology to control the steam generator 21 to generate steam. On the one hand, it eliminates the need for additional heating devices, reducing the use of components and lowering equipment costs; on the other hand, it improves energy utilization efficiency and reduces energy consumption.

[0065] In one possible embodiment, the control method for the turbine rapid preheating start-up system includes the following steps:

[0066] S100, control the boiler 25 and the water pump 24 to start, keep the first valve 4, the second valve 5 and the fourth valve 11 closed, the third valve 7 open, and acquire the steam temperature value detected by the first temperature detection element 8 and the outer cylinder 100 temperature value detected by the second temperature detection element 9 in real time.

[0067] S200: When the steam temperature is equal to the outer cylinder temperature, control the first valve 4 and the second valve 5 to open, and the third valve 7 and the fourth valve 11 to close, while increasing the power of the boiler 25.

[0068] S300 When the temperature of the outer cylinder 100 reaches the target temperature, control the first valve 4 and the fourth valve 11 to open, and the second valve 5 and the third valve 7 to close, so as to maintain the temperature of the outer cylinder 100 and keep the turbine 1 in hot standby state.

[0069] When turbine 1 finishes shutdown and restarts, control valves 4, 5, and 11 to close and valve 7 to open, supplying steam to the outside.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A steam turbine, characterized in that, The device includes an outer cylinder (100), which has a first manifold (101), a second manifold (102), and a plurality of independent steam channels (103). The first manifold (101) is located at one end of the outer cylinder (100) in the axial direction, and the second manifold (102) is located at the other end of the outer cylinder (100) in the axial direction. The plurality of steam channels (103) are arranged between the first manifold (101) and the second manifold (102) and are arranged along the circumference of the outer cylinder (100). One end of the steam channel (103) is connected to the first manifold (101), and the other end of the steam channel (103) is connected to the second manifold (102).

2. The steam turbine according to claim 1, characterized in that, The outer cylinder (100) includes an inner wall (1012) and an outer wall (1011). The inner wall (1012) and the outer wall (1011) form a sandwich cavity. Along the axial direction of the outer cylinder (100), a first sealing plate and a second sealing plate are respectively provided at both ends of the outer cylinder (100) to seal the sandwich cavity. Multiple partitions (1013) are provided in the sandwich cavity. The multiple partitions (1013) divide part of the sandwich cavity into multiple steam channels (103). The first end of the multiple partitions (1013) and the first sealing plate form the first confluence cavity (101), and the second end of the multiple partitions (1013) and the second sealing plate form the second confluence cavity (102).

3. The steam turbine according to claim 2, characterized in that, The inner wall (1012), the outer wall (1011), and the partition (1013) form an integral structure.

4. A steam turbine rapid start-up preheating system, characterized in that, It includes a heating module (2), a hydrophobic module (3), and a steam turbine (1) according to any one of claims 1-3; The heating module (2) includes a steam generator (21), the steam outlet of which is connected to the first manifold (101) through a steam inlet pipe (22), and the drainage module (3) includes a drainage pipe (31), one end of which is connected to the second manifold (102).

5. The turbine rapid start-up preheating system according to claim 4, characterized in that, The steam inlet pipe (22) is provided with a first valve (4), which is used to control the opening and closing of the steam inlet pipe (22). The drain pipe (31) is provided with a second valve (5), which is used to control the opening and closing of the drain pipe (31).

6. The turbine rapid start-up preheating system according to claim 5, characterized in that, The turbine rapid start-up preheating system also includes a steam external supply pipeline (6), one end of which is connected to the inlet of the first valve (4). A third valve (7) is provided on the steam external supply pipeline (6), which is used to control the opening and closing of the steam external supply pipeline (6).

7. The turbine rapid start-up preheating system according to claim 6, characterized in that, The steam inlet pipe (22) is provided with a first temperature detection element (8), which is used to detect the steam temperature in the steam inlet pipe (22) and is located at the inlet of the first valve (4); the outer cylinder (100) is provided with a second temperature detection element (9), which is used to detect the temperature of the outer cylinder (100).

8. The turbine rapid start-up preheating system according to claim 6, characterized in that, The turbine rapid start-up preheating system also includes an exhaust pipe (10), one end of which is connected to the second manifold (102) and the other end is connected to the external steam supply pipe (6). A fourth valve (11) is provided on the exhaust pipe (10), and the fourth valve (11) is used to control the opening and closing of the exhaust pipe (10).

9. The turbine rapid start-up preheating system according to claim 4, characterized in that, The heating module (2) also includes a water supply tank (23) and a water supply pump (24). The outlet of the water supply tank (23) is connected to the inlet of the water supply pump (24), and the outlet of the water supply pump (24) is connected to the inlet of the steam generator (21).

10. The steam turbine rapid start-up preheating system according to any one of claims 4-9, characterized in that, The heating module (2) also includes a boiler (25), a high-temperature molten salt storage tank (26), a low-temperature molten salt storage tank (27), and a molten salt pump (28); The molten salt outlet of the boiler (25) is connected to the inlet of the high-temperature molten salt storage tank (26), the outlet of the high-temperature molten salt storage tank (26) is connected to the molten salt inlet of the steam generator (21), the molten salt outlet of the steam generator (21) is connected to the inlet of the low-temperature molten salt storage tank (27), the outlet of the low-temperature molten salt storage tank (27) is connected to the inlet of the molten salt pump (28), and the outlet of the molten salt pump (28) is connected to the molten salt inlet of the boiler (25).

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