Thermal insulation device of steam turbine

Abstract

The steam turbine heat insulation device comprises a bearing box, a rotor, a high-pressure cylinder, an intermediate-pressure cylinder and a low-pressure cylinder, one end of the rotor is installed on the bearing box, and the other end of the rotor is sequentially and rotationally installed in the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder. The high-pressure cylinder comprises a high-pressure outer cylinder, a high-pressure inner cylinder, a steam inlet pipe, a heat insulation part and a steam discharge pipe; the high-pressure outer cylinder sleeves the outer side of the high-pressure inner cylinder; the first end of the steam inlet pipe is connected with a steam source, and the second end is connected with the first end of the high-pressure inner cylinder; the first end of the steam discharge pipe is connected with the second end of the high-pressure inner cylinder, and the second end of the steam discharge pipe penetrates through and extends out of the second end of the high-pressure outer cylinder; the heat insulation component comprises an outer cylinder heat insulation assembly and an inner cylinder heat insulation assembly. According to the device, the temperature is distributed in a stepped mode, effective heat insulation is conducted, and meanwhile energy is utilized to the maximum degree; through the layered heat preservation design, more uniform temperature flow can be kept in different areas, so that the temperature gradient is reduced, the heat insulation performance is improved, and the energy loss is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbine thermal insulation, and in particular relates to a steam turbine thermal insulation device. Background Art

[0002] As one of the core equipment of thermal power plants, steam turbines play a vital role in the electricity production process. However, existing steam turbines still have some shortcomings in terms of thermal insulation performance and steam utilization, which not only affect the efficiency of steam turbines, but also lead to energy waste and increased operating costs.

[0003] The existing steam turbines have poor thermal insulation capabilities, resulting in energy loss. During the operation of the steam turbine, steam becomes low-temperature and low-pressure exhaust steam after passing through the blades at each stage, and this process is accompanied by a large amount of heat exchange. In order to reduce heat loss, steam turbines usually use thermal insulation materials to wrap their outer shells to reduce heat conduction losses. However, existing thermal insulation materials and technical means cannot completely prevent heat loss, especially under high temperature and high pressure working conditions. The existing thermal insulation layer is prone to aging and failure due to excessive temperature, resulting in a decrease in thermal insulation performance. In addition, the internal structure of the steam turbine is complex, and the joints between the various components often become weak links in heat leakage, further exacerbating the problem of energy loss. This heat loss not only reduces the thermal efficiency of the steam turbine, but may also affect the stable operation of the unit.

[0004] The existing steam turbines have a low utilization rate for the steam flowing out of the high-, medium- and low-pressure cylinders. During the operation of the steam turbine, the steam passes through the high-, medium- and low-pressure cylinders in turn to do work, and the steam discharged after each stage of the cylinder still carries a large amount of available energy. However, the current steam turbine design often fails to fully utilize the energy of this part of the steam, resulting in energy waste. For example, in some cases, the exhaust steam after the low-pressure cylinder is directly discharged into the condenser for cooling without being effectively utilized. Although some systems use heat recovery cycles to improve steam utilization, due to technical limitations, these systems still have low efficiency problems in actual operation. In addition, under different load conditions, the steam parameters of each cylinder of the steam turbine will change, and it is difficult for the existing control system to adjust in real time according to these changes to maximize the use of steam energy, resulting in a further decrease in steam utilization.

[0005] Existing steam turbines lack flexibility in design and are difficult to adapt to changing operating conditions. As the demand for electricity market continues to change, steam turbines need to be able to operate efficiently under different load conditions. However, existing steam turbine designs often focus on optimization under a specific operating condition, and their performance will be affected when operating conditions change. Especially when operating at low loads, the efficiency of the steam turbine will drop significantly due to the small steam flow rate, further exacerbating energy losses. In addition, when dealing with emergencies such as emergency shutdowns or sudden load changes, existing steam turbines have a slow response speed and are difficult to quickly adjust to the optimal working state, which also affects the utilization of steam.

[0006] In view of the above problems, it is necessary to propose a steam turbine thermal insulation device which has a reasonable design and can effectively improve the above problems. Summary of the invention

[0007] The present application aims to solve at least one of the technical problems existing in the prior art and provide a steam turbine thermal insulation device.

[0008] The present invention provides a steam turbine heat insulation device, comprising a bearing box, a rotor, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder;

[0009] The first end of the rotor is mounted on the bearing box, and the second end of the rotor is rotatably mounted in the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence;

[0010] The high-pressure cylinder comprises a high-pressure outer cylinder, a high-pressure inner cylinder, a steam inlet pipe, a heat insulation component and a steam exhaust pipe;

[0011] The high-pressure outer cylinder is sleeved on the outer side of the high-pressure inner cylinder;

[0012] The first end of the steam inlet pipe is used to be connected to a steam source, and the second end of the steam inlet pipe passes through the first end of the high-pressure outer cylinder and is connected to the first end of the high-pressure inner cylinder;

[0013] The first end of the steam exhaust pipe is connected to the second end of the high-pressure inner cylinder, and the second end of the steam exhaust pipe passes through and extends out of the second end of the high-pressure outer cylinder;

[0014] The heat insulation component includes an outer cylinder heat insulation component and an inner cylinder heat insulation component, wherein the outer cylinder heat insulation component is arranged on the high-pressure outer cylinder, and the inner cylinder heat insulation component is arranged on the high-pressure outer cylinder and the high-pressure inner cylinder.

[0015] Optionally, a plurality of first circulation intervals are arranged inside the high-pressure outer cylinder;

[0016] A plurality of second circulation intervals are arranged inside the high-pressure inner cylinder;

[0017] The inner wall of the high-pressure outer cylinder and the outer wall of the high-pressure inner cylinder are provided with a vacuum zone, and the vacuum zone is used for heat insulation.

[0018] Optionally, a first aerogel ring is fixedly provided on the outer wall of the steam inlet pipe, and the first aerogel ring is located in the vacuum zone;

[0019] A second aerogel ring is fixedly disposed on the outer wall of the steam exhaust pipe. Three second aerogel rings are disposed, and the three second aerogel rings are respectively located in the first circulation interval, the vacuum interval, and the second circulation interval.

[0020] Optionally, the outer cylinder heat insulation assembly includes a first air inlet pipe, a first electric air valve, a first air outlet pipe and a second electric valve;

[0021] The first end of the first air intake pipe is used to be connected to the steam exhaust pipe of the low-pressure cylinder of the steam turbine, the second end of the first air intake pipe is arranged on the outer wall of the high-pressure inner cylinder and is connected to the first circulation interval, and the first electric air valve is fixedly installed on the first air intake pipe;

[0022] The first end of the first air outlet pipe is arranged on the outer wall of the high-pressure inner cylinder and is connected to the first circulation zone, the second end of the first air outlet pipe extends out of the high-pressure outer cylinder, and the second electric air valve is fixedly installed on the first air outlet pipe.

[0023] Optionally, the inner cylinder heat insulation assembly includes a second air inlet pipe, a second air outlet pipe, a switch pipe and a blocking assembly;

[0024] The second air intake pipe is arranged on the inner wall of the high-pressure inner cylinder and is connected with the second circulation zone;

[0025] The two ends of the switch tube are plugged into the high-voltage outer cylinder and the high-voltage inner cylinder;

[0026] The top of the second air outlet pipe is fixedly mounted on the outer wall of the high-pressure inner cylinder, and the bottom of the second air outlet pipe is fixedly mounted on the steam exhaust pipe;

[0027] The blocking component is telescopically arranged in the switch tube; wherein,

[0028] When it is necessary to intercept the steam, the blocking assembly is extended to block the second air inlet pipe.

[0029] Optionally, the blocking assembly includes a switch motor, a bevel gear set, a threaded rod, a slide groove, a piston and a slider;

[0030] The base of the switch motor is fixedly mounted on the outer wall of the high-pressure outer cylinder;

[0031] The bevel gear at the input end of the bevel gear set is fixedly mounted on the rotating shaft of the switch motor, and the bevel gear at the output end of the bevel gear set is fixedly mounted on one end of the threaded rod;

[0032] The slide grooves are provided on both sides of the inner wall of the switch tube;

[0033] The piston is slidably mounted in the switch tube, and the sliders are fixedly mounted on both sides of the outer wall of the piston;

[0034] The sliding block is slidably installed in the sliding groove;

[0035] The other end of the threaded rod is threadedly inserted into one end of the piston, and the other end of the piston is inserted into the second air intake pipe.

[0036] Optionally, it also includes a third aerogel ring and a fourth aerogel ring;

[0037] The third aerogel ring is fixedly mounted on the outer wall of the switch tube, and the third aerogel ring is located in the first circulation interval, the vacuum interval and the second circulation interval;

[0038] The fourth aerogel ring is fixedly mounted on the second air outlet pipe, and the fourth aerogel ring is located in the vacuum interval and the second circulation interval.

[0039] Optionally, a third electric valve is also included;

[0040] The third electric gas valve is fixedly mounted on the second gas outlet pipe.

[0041] Optionally, a contact groove is provided on the inner wall of the high-pressure outer cylinder;

[0042] The outer wall of the high-pressure inner cylinder is provided with a contact ring, and the contact ring is embedded in the contact groove.

[0043] Optionally, the high-pressure outer cylinder includes a first sub-high-pressure outer cylinder and a second sub-high-pressure outer cylinder which are symmetrically distributed;

[0044] The first sub-high-pressure outer cylinder and the second sub-high-pressure outer cylinder are detachably connected.

[0045] The steam turbine heat insulation device of the present invention divides the steam turbine into a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, wherein the inner and outer cylinders of the high-pressure cylinder are arranged to include a high-pressure inner cylinder and a high-pressure outer cylinder. By utilizing the temperature of the steam output from the high-pressure inner cylinder itself and the temperature of the steam output from the low-pressure cylinder by the high-pressure outer cylinder, the temperature is distributed in a step-by-step manner, effective heat insulation is performed, and energy is utilized to the greatest extent at the same time. Through the layered thermal insulation design, a more uniform temperature flow can be maintained in different areas, thereby reducing the temperature gradient, avoiding local overheating, and more effectively preventing heat transfer, thereby improving the thermal insulation performance, while improving the optimization and utilization of heat energy and reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the overall structure of a steam turbine heat insulation device proposed by the present invention from a first perspective;

[0047] Figure 2 A schematic diagram of the overall structure of a steam turbine heat insulation device proposed by the present invention from a second perspective;

[0048] Figure 3 A cross-sectional view of a high-pressure outer cylinder of a steam turbine thermal insulation device proposed by the present invention

[0049] picture

[0050] Figure 4 A steam turbine heat insulation device proposed by the present invention Figure 3 A magnified image of point A;

[0051] Figure 5 A steam turbine heat insulation device proposed by the present invention Figure 3 The enlarged view of point B;

[0052] Figure 6 A steam turbine heat insulation device proposed by the present invention Figure 3 Enlarged view of point C;

[0053] Figure 7 A steam turbine heat insulation device proposed by the present invention Figure 3 The enlarged view of point D;

[0054] Figure 8 A steam turbine heat insulation device proposed by the present invention Figure 3 Enlarged view of point E. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] like Figures 1 to 8As shown, the present invention provides a steam turbine heat insulation device, comprising a bearing box, a rotor, a high-pressure cylinder 1, a medium-pressure cylinder and a low-pressure cylinder. The first end of the rotor is mounted on the bearing box, and the second end of the rotor is rotatably mounted in the high-pressure cylinder 1, the medium-pressure cylinder and the low-pressure cylinder in turn.

[0057] The high-pressure cylinder comprises a high-pressure outer cylinder 2, a high-pressure inner cylinder 3, a steam inlet pipe 4, a heat insulating component 5 and a steam exhaust pipe 6. The high-pressure outer cylinder 2 is sleeved on the outer side of the high-pressure inner cylinder 3.

[0058] The first end of the steam inlet pipe 4 is used to be connected to a steam source, and the second end of the steam inlet pipe 4 passes through the first end of the high-pressure outer cylinder 2 and is connected to the first end of the high-pressure inner cylinder 3 .

[0059] The first end of the steam exhaust pipe 6 is connected to the second end of the high-pressure inner cylinder 3 , and the second end of the steam exhaust pipe 6 passes through and extends out of the second end of the high-pressure outer cylinder 2 .

[0060] The heat insulation component 5 includes an outer cylinder heat insulation component 7 and an inner cylinder heat insulation component 8, wherein the outer cylinder heat insulation component 7 is arranged on the high-pressure outer cylinder 2, and the inner cylinder heat insulation component 8 is arranged on the high-pressure outer cylinder 2 and the high-pressure inner cylinder 3.

[0061] Specifically, the steam inlet pipe 4 is connected to the external steam equipment, and enters the high-pressure inner cylinder 3 through the steam inlet pipe 4, thereby driving the rotor in the high-pressure inner cylinder 3 to rotate. The temperature in the working area of ​​the high-pressure cylinder 1 is relatively high, and the temperature supply is more likely to be lost in the environment. The heat insulation of the high-pressure cylinder 1 is particularly important. The loss of temperature and heat of the high-pressure cylinder 1 is transferred to the high-pressure outer cylinder 2 through the high-pressure inner cylinder 3, and then the high-pressure outer cylinder 2 transfers the heat to the outside. The initial temperature of the steam entering the high-pressure cylinder 1 is above 500°C, and the temperature of the steam leaving the high-pressure cylinder 1 is between 300°C and 400°C.

[0062] The steam turbine heat insulation device of the present invention divides the steam turbine into a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, wherein the inner and outer cylinders of the high-pressure cylinder are arranged to include a high-pressure inner cylinder and a high-pressure outer cylinder. By utilizing the temperature of the steam output from the high-pressure inner cylinder itself and the temperature of the steam output from the low-pressure cylinder by the high-pressure outer cylinder, the temperature is distributed in a step-by-step manner, effective heat insulation is performed, and energy is utilized to the greatest extent at the same time. Through the layered thermal insulation design, a more uniform temperature flow can be maintained in different areas, thereby reducing the temperature gradient, avoiding local overheating, and more effectively preventing heat transfer, thereby improving the thermal insulation performance, while improving the optimization and utilization of heat energy and reducing energy loss.

[0063] For example, Figure 3 As shown, a plurality of first circulation intervals 2.4 are arranged inside the high-pressure outer cylinder 2, and a first connecting block 2.5 is fixedly arranged inside the first circulation interval 2.4.

[0064] A plurality of second circulation zones 3.2 are arranged inside the high-pressure inner cylinder 3, and a second connection block 3.3 is fixedly arranged on the inner wall of the second circulation zone 3.2.

[0065] The inner wall of the high-pressure outer cylinder 2 and the outer wall of the high-pressure inner cylinder 3 are provided with a vacuum zone 9. That is, the vacuum zone 9 is a vacuum area for heat insulation.

[0066] For example, Figure 3 As shown, a first aerogel ring 4 . 1 is fixedly arranged on the outer wall of the steam inlet pipe 4 , and the first aerogel ring 4 . 1 is located in the vacuum space 9 .

[0067] like Figure 6 As shown, a second aerogel ring 6.1 is fixedly arranged on the outer wall of the steam exhaust pipe 6. There are three second aerogel rings 6.1, and the three second aerogel rings 6.1 are respectively located in the first circulation interval 2.4, the vacuum interval 9 and the second circulation interval 3.2.

[0068] In this embodiment, the first aerogel ring 4.1 and the second aerogel ring 6.1 are used to insulate heat transfer.

[0069] For example, Figure 4 and Figure 5 As shown, the outer cylinder heat insulation assembly 7 includes a first air inlet pipe 7.1, a first electric air valve 7.2, a first air outlet pipe 7.3 and a second electric valve 7.4.

[0070] The first end of the first air intake pipe 7.1 is used to be connected to the steam exhaust pipe of the low-pressure cylinder of the steam turbine, the second end of the first air intake pipe 7.1 is arranged on the outer wall of the high-pressure inner cylinder 3 and is connected to the first circulation zone 2.4, and the first electric air valve 7.2 is fixedly installed on the first air intake pipe 7.1.

[0071] The first end of the first air outlet pipe 7.3 is arranged on the outer wall of the high-pressure inner cylinder 3 and is connected to the first circulation zone 2.4. The second end of the first air outlet pipe 7.3 extends out of the high-pressure outer cylinder 2. The second electric air valve 7.4 is fixedly installed on the first air outlet pipe 7.1.

[0072] Specifically, the high-pressure outer cylinder 2 is connected to the pipeline of steam discharged from the low-pressure cylinder of the turbine through the first air inlet pipe 7.1. The steam portion of the low-pressure cylinder is discharged into the first circulation interval 2.4 at a temperature of about 100°C and then discharged from the first air outlet pipe 7.3, thereby realizing temperature insulation of the high-pressure outer cylinder 2.

[0073] In this embodiment, the first air inlet pipe 7.1 and the first air outlet pipe 7.3 are used to connect the first circulation section 2.4 to facilitate the circulation of steam.

[0074] For example, Figure 4 and Figure 6 As shown, the inner cylinder heat insulation assembly 8 includes a second air inlet pipe 8.1, a second air outlet pipe 8.10, a switch tube 8.2 and a blocking assembly.

[0075] The second air inlet pipe 8.1 is arranged on the inner wall of the high-pressure inner cylinder 3 and is connected to the second circulation zone 2.4. The two ends of the switch pipe 8.2 are plugged into the high-pressure outer cylinder 2 and the high-pressure inner cylinder 3. The top of the second air outlet pipe 8.10 is fixedly mounted on the outer wall of the high-pressure inner cylinder 3, and the bottom of the second air outlet pipe 8.10 is fixedly mounted on the steam exhaust pipe 6. The plugging component is telescopically arranged in the switch pipe 8.2. When it is necessary to intercept the steam, the plugging component is extended to block the second air inlet pipe 8.1.

[0076] For example, Figure 4 As shown, the blocking assembly includes a gear set 8.4, a threaded rod 8.5, a slide groove 8.6, a piston 8.7 and a slider 8.8. Both ends of the switch tube 8.2 are plugged into the high-pressure outer cylinder 2 and the high-pressure inner cylinder 3. The base of the switch motor 8.3 is fixedly mounted on the outer wall of the high-pressure outer cylinder 2. The input end bevel gear of the bevel gear set 8.4 is fixedly mounted on the rotating shaft of the switch motor 8.3. The output end bevel gear of the bevel gear set 8.4 is fixedly mounted on one end of the threaded rod 8.5. The slide groove 8.6 is provided on both sides of the inner wall of the switch tube 8.2. The piston 8.7 is slidably mounted in the switch tube 8.2. The slider 8.8 is fixedly mounted on both sides of the outer wall of the piston 8.7, and the slider 8.8 is slidably mounted in the slide groove 8.6. The other end of the threaded rod 8.5 is threadedly plugged into one end of the piston 8.7. The other end of the piston 8.7 is plugged into the second intake pipe 8.1.

[0077] Specifically, the high-pressure inner cylinder 3 of the high-pressure cylinder 1 is insulated, and when the steam leaves the high-pressure cylinder 1, the steam is intercepted, and the switch motor 8.3 is started. The rotation of the switch motor 8.3 drives the rotation of the bevel gear set 8.4, and the rotation of the bevel gear set 8.4 drives the rotation of the threaded rod 8.5. The rotation of the threaded rod 8.5 drives the piston 8.7 to extend and retract in the switch tube 8.2. The extension of the piston 8.7 blocks the second air inlet pipe 8.1, preventing the steam in the high-pressure cylinder 1 that is ready to leave from the second air inlet pipe 8.1 from passing through the second air inlet pipe 8.1 and then entering the second circulation interval 3.2 from the second air inlet pipe 8.1.

[0078] When the piston 8.7 is shortened and no longer blocks the second air inlet pipe 8.1, steam will enter the second circulation section 3.2 from the second air inlet pipe 8.1 to increase the temperature of the high-pressure inner cylinder 3. The second circulation section 3.2 will converge with the steam exhaust pipe 6 through the opening of the second air outlet pipe 8.10 and the third electric air valve 8.12.

[0079] For example, Figure 4 and Figure 6As shown, the inner cylinder insulation assembly 8 further includes a third aerogel ring 8.9 and a fourth aerogel ring 8.11.

[0080] The third aerogel ring 8.9 is fixedly mounted on the outer wall of the switch tube 8.2. The third aerogel ring 8.9 is located in the first circulation interval 2.4, the vacuum interval 9 and the second circulation interval 3.2.

[0081] The fourth aerogel ring 8.11 is fixedly mounted on the second air outlet pipe 8.10, and the fourth aerogel ring 8.11 is located in the vacuum zone 9 and the second circulation zone 3.2.

[0082] like Figure 6 As shown, the inner cylinder heat insulation assembly 8 also includes a third electric valve 8.12; the third electric gas valve 8.12 is fixedly mounted on the second gas outlet pipe 8.10.

[0083] In this embodiment, the third aerogel ring 8.9 and the fourth aerogel ring 8.11 are used to isolate heat transfer.

[0084] For example, Figure 7 As shown, the inner wall of the high-pressure outer cylinder 2 is provided with a contact groove 2.6; the outer wall of the high-pressure inner cylinder 3 is provided with a contact ring 3.4, and the contact ring 3.4 is embedded in the contact groove 2.6.

[0085] In this embodiment, the contact area between the high-pressure outer cylinder 2 and the high-pressure inner cylinder 3 through the contact groove 2.6 and the contact ring 3.4 is greatly reduced, thereby limiting the heat transfer to the greatest extent.

[0086] Exemplarily, as shown in the figure, the high-pressure outer cylinder 2 includes a first sub-high-pressure outer cylinder and a second sub-high-pressure outer cylinder which are symmetrically distributed; the first sub-high-pressure outer cylinder and the second sub-high-pressure outer cylinder are detachably connected.

[0087] Specifically, Figure 1 , Figure 2 and Figure 8 As shown, the high-pressure outer cylinder 2 is symmetrically arranged, a first flange 2.1 is fixedly arranged at the bottom of the high-pressure outer cylinder 2, a first threaded hole 2.2 is opened on the outer surface of the first flange 2.1, and second threaded holes 2.3 are opened at both ends of the high-pressure outer cylinder 2. The outer walls of both ends of the high-pressure inner cylinder 3 are opened with third threaded holes 3.1. Figure 2 As shown, the high-pressure cylinder 1 also includes a first fixing bolt 10 and a second fixing bolt 11, wherein the threaded end of the first fixing bolt 10 is threadedly inserted in the first threaded hole 2.2, the threaded end of the second fixing bolt 11 is threadedly inserted into the second threaded hole 2.3, and the threaded end of the second fixing bolt 11 is threadedly inserted in the third threaded hole 3.1. The first fixing bolt 10 and the second fixing bolt 11 better connect the high-pressure outer cylinder 2 and the high-pressure inner cylinder 3 together.

[0088] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A steam turbine heat insulation device, characterized in that: It includes a bearing box, a rotor, a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder; The first end of the rotor is mounted on the bearing box, and the second end of the rotor is rotatably mounted in the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder in sequence; The high-pressure cylinder comprises a high-pressure outer cylinder, a high-pressure inner cylinder, a steam inlet pipe, a heat insulation component and a steam exhaust pipe; The high-pressure outer cylinder is sleeved on the outer side of the high-pressure inner cylinder; The first end of the steam inlet pipe is used to be connected to a steam source, and the second end of the steam inlet pipe passes through the first end of the high-pressure outer cylinder and is connected to the first end of the high-pressure inner cylinder; The first end of the steam exhaust pipe is connected to the second end of the high-pressure inner cylinder, and the second end of the steam exhaust pipe passes through and extends out of the second end of the high-pressure outer cylinder; The heat insulation component includes an outer cylinder heat insulation component and an inner cylinder heat insulation component, wherein the outer cylinder heat insulation component is arranged on the high-pressure outer cylinder, and the inner cylinder heat insulation component is arranged on the high-pressure outer cylinder and the high-pressure inner cylinder.

2. The steam turbine heat insulation device according to claim 1, characterized in that: A plurality of first circulation intervals are arranged inside the high-pressure outer cylinder; A plurality of second circulation intervals are arranged inside the high-pressure inner cylinder; The inner wall of the high-pressure outer cylinder and the outer wall of the high-pressure inner cylinder are provided with a vacuum zone, and the vacuum zone is used for heat insulation.

3. The steam turbine heat insulation device according to claim 2, characterized in that: A first aerogel ring is fixedly arranged on the outer wall of the steam inlet pipe, and the first aerogel ring is located in the vacuum zone; A second aerogel ring is fixedly disposed on the outer wall of the steam exhaust pipe. Three second aerogel rings are disposed, and the three second aerogel rings are respectively located in the first circulation interval, the vacuum interval, and the second circulation interval.

4. The steam turbine heat insulation device according to claim 2, characterized in that: The outer cylinder heat insulation assembly includes a first air inlet pipe, a first electric air valve, a first air outlet pipe and a second electric valve; The first end of the first air intake pipe is used to be connected to the steam exhaust pipe of the low-pressure cylinder of the steam turbine, the second end of the first air intake pipe is arranged on the outer wall of the high-pressure inner cylinder and is connected to the first circulation interval, and the first electric air valve is fixedly installed on the first air intake pipe; The first end of the first air outlet pipe is arranged on the outer wall of the high-pressure inner cylinder and is connected to the first circulation zone, the second end of the first air outlet pipe extends out of the high-pressure outer cylinder, and the second electric air valve is fixedly installed on the first air outlet pipe.

5. The steam turbine heat insulation device according to claim 2, characterized in that: The inner cylinder heat insulation assembly includes a second air inlet pipe, a second air outlet pipe, a switch pipe and a plugging assembly; The second air intake pipe is arranged on the inner wall of the high-pressure inner cylinder and is connected with the second circulation zone; The two ends of the switch tube are plugged into the high-voltage outer cylinder and the high-voltage inner cylinder; The top of the second air outlet pipe is fixedly mounted on the outer wall of the high-pressure inner cylinder, and the bottom of the second air outlet pipe is fixedly mounted on the steam exhaust pipe; The blocking component is telescopically arranged in the switch tube; wherein, When it is necessary to intercept the steam, the blocking assembly is extended to block the second air inlet pipe.

6. The steam turbine heat insulation device according to claim 5, characterized in that: The blocking assembly includes a switch motor, a bevel gear set, a threaded rod, a slide groove, a piston and a slide block; The base of the switch motor is fixedly mounted on the outer wall of the high-pressure outer cylinder; The bevel gear at the input end of the bevel gear set is fixedly mounted on the rotating shaft of the switch motor, and the bevel gear at the output end of the bevel gear set is fixedly mounted on one end of the threaded rod; The slide grooves are provided on both sides of the inner wall of the switch tube; The piston is slidably mounted in the switch tube, and the sliders are fixedly mounted on both sides of the outer wall of the piston; The sliding block is slidably installed in the sliding groove; The other end of the threaded rod is threadedly inserted into one end of the piston, and the other end of the piston is inserted into the second air intake pipe.

7. The steam turbine heat insulation device according to claim 5, characterized in that: Also included is a third aerogel ring and a fourth aerogel ring; The third aerogel ring is fixedly mounted on the outer wall of the switch tube, and the third aerogel ring is located in the first circulation interval, the vacuum interval and the second circulation interval; The fourth aerogel ring is fixedly mounted on the second air outlet pipe, and the fourth aerogel ring is located in the vacuum interval and the second circulation interval.

8. The steam turbine heat insulation device according to claim 5, characterized in that: Also included is a third electric valve; The third electric gas valve is fixedly mounted on the second gas outlet pipe.

9. The steam turbine heat insulation device according to any one of claims 1 to 8, characterized in that: The inner wall of the high-pressure outer cylinder is provided with a contact groove; The outer wall of the high-pressure inner cylinder is provided with a contact ring, and the contact ring is embedded in the contact groove.

10. The steam turbine heat insulation device according to any one of claims 1 to 8, characterized in that: The high-pressure outer cylinder comprises a first sub-high-pressure outer cylinder and a second sub-high-pressure outer cylinder which are symmetrically distributed; The first sub-high-pressure outer cylinder and the second sub-high-pressure outer cylinder are detachably connected.

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