Improved structure of external steam supply main pipeline of thermal power plant

Abstract

The invention discloses a transformation structure of an external steam supply mother pipeline of a thermal power plant, and relates to the technical field of external steam supply mother pipelines. According to the transformation structure of the external steam supply mother pipeline of the thermal power plant, through the arrangement of the inner disc frame, the assembly angle of the flow dividing pipeline can be adjusted by rotating the inner disc frame installed in the flow dividing disc, then the adjustment operation of the steam conveying angle is achieved, and meanwhile through the cooperation of the backflow pipeline and the plugging head, in the steam conveying process, the assembly angle of the flow dividing pipeline can be adjusted. By means of the structure, the plugging head is pressed to complete plugging of the backflow pipeline, automatic resetting is achieved after steam conveying is completed, automatic discharging treatment of liquid is achieved, compared with a traditional gas supply pipeline, the residual time of the liquid in the main pipeline can be effectively shortened, operation is more convenient, and meanwhile the maintenance convenience of equipment is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of external steam supply headers, and specifically to a reconstruction structure for the external steam supply main pipeline of a thermal power plant. Background Technique

[0002] The external steam supply main pipeline is mainly used to transport hot steam to meet a series of operations of the thermal power plant. When transporting steam through the external steam supply main pipeline, several branch pipes are generally connected to the outer wall of the external steam supply main pipeline to facilitate selective steam supply to different branch pipes. Referring to the Chinese patent with the publication number "CN117386897A" titled "A Reconstruction Structure for the External Steam Supply Main Pipeline of a Thermal Power Plant", this patent points out that the existing equipment is inconvenient for heat preservation of steam and removal of liquefied steam, inconvenient for keeping the inside of the external steam supply main pipeline dry after stopping work, not conducive to extending the service life of the external steam supply main pipeline, and prone to damage and rust of the external steam supply main pipeline; however, this equipment still has the problems of relatively cumbersome operation and poor maintenance convenience. For this reason, we propose a reconstruction structure for the external steam supply main pipeline of a thermal power plant to solve the above problems. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a reconstruction structure for the external steam supply main pipeline of a thermal power plant, which solves the problems raised in the above background technique.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A reconstruction structure for the external steam supply main pipeline of a thermal power plant includes a main pipeline. A flow splitting disc is connected to the end of the main pipeline and is connected to a plurality of flow splitting pipelines through the flow splitting disc for splitting the transported steam. A control valve is installed inside the flow splitting pipelines.

[0005] An inner disc frame is rotatably connected inside the flow splitting disc, and a plurality of the flow splitting pipelines are fixedly connected to the inner disc frame. The inner disc frame is used to adjust the angles of the plurality of flow splitting pipelines. A sealing assembly is provided between the flow splitting disc and the inner disc frame to ensure the sealing between the two.

[0006] A return pipeline is provided between the main pipeline and the flow splitting disc. A return pipe that is interconnected is fixedly installed at the bottom of the return pipeline for discharging the liquid adhering to the inner wall of the main pipeline.

[0007] A plug head is slidably installed at the end of the return pipe. A limiting ring frame is fixedly installed inside the return pipe. A plurality of support springs are fixedly installed between the limiting ring frame and the plug head. A plurality of liquid inlet holes are opened inside the plug head. The top surface of the plug head is inclined and a sealing gasket is rotatably installed, which is used to block the end of the return pipe by the sealing gasket and the plug head being pressed when the main pipeline is transporting steam.

[0008] Preferably, a limiting notch is formed on the top surface of the plugging head, a rotating shaft is rotatably installed inside the limiting notch, and the sealing gasket is rotatably connected to the rotating shaft.

[0009] Preferably, a sealing ring is fixedly installed at the bottom of the sealing gasket.

[0010] Preferably, limiting sleeves are fixedly installed on both sides inside the limiting ring frame, an inner sliding rod is slidably installed inside the limiting sleeve, one end of the inner sliding rod away from the limiting sleeve is fixedly connected to the plugging head, an airbag is fixedly installed at one end of the limiting sleeve away from the inner sliding rod, a connecting pull rope is fixedly installed between the airbag and the inner sliding rod, and an exhaust hole is formed at the end of the airbag.

[0011] Preferably, a heating sheet is fixedly installed inside the main pipeline.

[0012] Preferably, positioning flanges are provided between the main pipeline and the end parts of the return pipeline and the shunt plate.

[0013] Preferably, the sealing assembly includes a sealing gasket ring, the sealing gasket ring is fixed inside the shunt plate, the inner disc frame is in mutual fit with the sealing gasket ring, a limiting ring piece is fixedly installed on the outer side of the inner disc frame, a plurality of limiting insertion rods are slidably installed inside the limiting ring piece, and return springs are sleeved on the outer sides of the limiting insertion rods.

[0014] Preferably, a pressure detection valve, a pressure relief valve and a temperature detection valve are fixedly installed inside the main pipeline respectively.

[0015] Preferably, a drain pipe is fixedly installed at the end of the return pipeline, and a one-way valve is fixedly installed at the end of the drain pipe.

[0016] Preferably, a liquid level monitor is fixedly installed inside the drain pipe.

[0017] The present invention provides a transformation structure of an external steam supply main pipeline of a thermal power plant. Compared with the prior art, the following beneficial effects are achieved:

[0018] (1) For the transformation structure of the external steam supply main pipeline of the thermal power plant, through the setting of the inner disc frame, the assembly angle of the shunt pipeline can be adjusted by rotating the inner disc frame installed inside the shunt plate, so as to realize the adjustment operation of the steam transmission angle. At the same time, through the cooperation of the return pipeline and the plugging head, during the steam transmission process, the plugging head is pressed to complete the plugging of the return pipeline, and automatically resets after the steam transmission is completed, realizing the automatic discharge treatment of the liquid. Compared with the traditional gas supply pipeline, the liquid residue time inside the main pipeline can be effectively reduced, the operation is more convenient, and the maintenance convenience of the equipment is further improved.

[0019] (2) The modified structure of the external steam supply main pipeline of this thermal power plant, through the setting of the drain pipe and the one-way valve, when the liquid is discharged through the return pipeline, it can enter the inside of the drain pipe. Until the liquid level reaches the preset value, the one-way valve opens to discharge the liquid. On the one hand, it can improve the convenience of pipeline use, and at the same time, it can ensure the sealing performance during the transportation of the main pipeline, realize the automatic discharge treatment of the liquid, and avoid external impurities from entering the inside of the drain pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 is a schematic side view structure diagram;

[0022] Figure 3 For the present invention Figure 1 is a schematic sectional view structure diagram;

[0023] Figure 4 For the present invention Figure 3 is a schematic side view structure diagram;

[0024] Figure 5 For the present invention Figure 4 is a schematic enlarged structure diagram at position A in the present invention;

[0025] Figure 6 is a schematic sectional view structure diagram of the return pipeline and the return conduit of the present invention;

[0026] Figure 7 is a schematic sectional view structure diagram of the plugging head of the present invention;

[0027] Figure 8 For the present invention Figure 7 is a schematic enlarged structure diagram at position B in the present invention.

[0028] In the figure: 1, main pipeline; 101, heating sheet; 2, shunt disc; 3, inner disc frame; 301, limiting ring piece; 302, limiting insertion rod; 3021, return spring; 303, sealing gasket ring; 4, shunt pipeline; 5, control valve; 6, pressure detection valve; 7, pressure relief valve; 8, temperature detection valve; 9, positioning flange; 10, return pipeline; 11, return conduit; 12, plugging head; 1201, limiting notch; 1202, liquid inlet hole; 13, sealing gasket; 1301, rotating shaft; 1302, sealing ring; 14, support spring; 15, limiting ring frame; 16, limiting sleeve; 1601, inner sliding rod; 1602, airbag; 1603, connecting pull rope; 17, drain pipe; 1701, one-way valve; 1702, liquid level monitor. DETAILED DESCRIPTION OF THE INVENTION

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1-8 , the present invention provides two technical solutions, specifically including the following embodiments:

[0031] Embodiment 1:

[0032] A modified structure of the external steam supply main pipeline of a thermal power plant includes a main pipeline 1. The end of the main pipeline 1 is connected to a shunt plate 2 and is connected to a plurality of shunt pipelines 4 through the shunt plate 2 for shunting the transported steam. A control valve 5 is installed inside the shunt pipeline 4;

[0033] Specifically, through the main pipeline 1, it can be used to transport steam until the steam is shunted and transported through the corresponding shunt pipeline 4. The control valve 5 is an existing device for controlling the opening and closing of the shunt pipeline 4;

[0034] An inner disc frame 3 is rotatably connected inside the shunt plate 2. A plurality of shunt pipelines 4 are fixedly connected to the inner disc frame 3. The inner disc frame 3 is used to adjust the angles of the plurality of shunt pipelines 4. A sealing sheet is provided between the shunt plate 2 and the inner disc frame 3 to ensure the sealing between the two;

[0035] Through the setting of the inner disc frame 3, the assembly angle of the shunt pipeline 4 can be adjusted by rotating the inner disc frame 3 installed inside the shunt plate 2, thereby realizing the adjustment operation of the steam transportation angle and ensuring the assembly convenience of the equipment;

[0036] A return pipeline 10 is provided between the main pipeline 1 and the shunt plate 2. The bottom of the return pipeline 10 is fixedly installed with a return pipe 11 communicating with each other for discharging the liquid attached to the inner wall of the main pipeline 1;

[0037] A plug head 12 is slidably installed at the end of the return pipe 11. A limiting ring frame 15 is fixedly installed inside the return pipe 11. A plurality of support springs 14 are fixedly installed between the limiting ring frame 15 and the plug head 12. A plurality of liquid inlet holes 1202 are opened inside the plug head 12. The top surface of the plug head 12 is provided as an inclined surface and a sealing gasket 13 is rotatably installed, so that when the main pipeline 1 is transporting steam, the sealing gasket 13 and the plug head 12 are pressed to block the end of the return pipe 11;

[0038] With the setting of the reflux pipeline 11, when the device conveys steam, the plugging head 12 can be pressed and retracted into the reflux pipeline 11, and the end of the reflux pipeline 11 is plugged by the sealing gasket 13. At this time, the steam will not leak. After the steam conveyance is completed, the cooperation of the support spring 14 can drive the plugging head 12 and the sealing gasket 13 to lift upward. At this time, the liquid remaining in the main pipeline 1 can automatically drain through the liquid inlet hole 1202 and the reflux pipeline 11, further improving the maintenance convenience of the device;

[0039] A limiting notch 1201 is formed on the top surface of the plugging head 12, and a rotating shaft 1301 is rotatably installed inside the limiting notch 1201. The sealing gasket 13 is rotatably connected to the rotating shaft 1301;

[0040] By rotatably connecting the sealing gasket 13 to the plugging head 12, when the plugging head 12 is compressed and inserted into the reflux pipeline 11, the sealing gasket 13 can rotate along the rotating shaft 1301 under force until it fits with the end of the reflux pipeline 11, further ensuring the sealing effect;

[0041] A sealing ring 1302 is fixedly installed at the bottom of the sealing gasket 13, and the sealing ring 1302 is used to improve the sealing performance between the sealing gasket 13 and the reflux pipeline 11;

[0042] On both sides inside the limiting ring frame 15, limiting sleeves 16 are fixedly installed, and an inner sliding rod 1601 is slidably installed inside the limiting sleeve 16. One end of the inner sliding rod 1601 away from the limiting sleeve 16 is fixedly connected to the plugging head 12. An airbag 1602 is fixedly installed at one end of the limiting sleeve 16 away from the inner sliding rod 1601. A connecting pull rope 1603 is fixedly installed between the airbag 1602 and the inner sliding rod 1601, and an exhaust hole is formed at the end of the airbag 1602;

[0043] Specifically, the driving of the plugging head 12 is driven by the steam pressure inside the main pipeline 1. When the steam is being conveyed, it can press the sealing gasket 13 and drive the plugging head 12 to retract. At this time, the inner sliding rod 1601 can be pushed into the limiting sleeve 16 through the plugging head 12, compressing the airbag 1602. At this time, the air inside the airbag 1602 can be discharged through the exhaust hole. When the steam stops being conveyed, at this time, the plugging head 12 and the sealing gasket 13 can be reset through the cooperation of the support spring 14, tensioning the connecting pull rope 1603, so that air can slowly enter the airbag 1602. Until the air completely enters the airbag 1602, the plugging head 12 moves to the uppermost position. Through the setting of the airbag 1602, the time required for the plugging head 12 to move upward can be extended, avoiding the high-temperature steam inside the main pipeline 1 from being discharged through the reflux pipeline 11, further ensuring the operation effect and safety of the pipeline,

[0044] Specifically, a heating sheet 101 is fixedly installed inside the main pipeline 1. The heating sheet 101 is an existing device used for heating steam.

[0045] Specifically, positioning flanges 9 are provided between the main pipeline 1, the return pipeline 10, and the ends of the flow dividing plate 2.

[0046] A pressure detection valve 6, a pressure relief valve 7, and a temperature detection valve 8 are respectively and fixedly installed inside the main pipeline 1. The pressure detection valve 6 is used to detect the pressure value inside the main pipeline 1. The pressure relief valve 7 is used for pressure relief operations. When the steam transportation inside the main pipeline 1 stops, the pressure relief valve 7 can perform pressure relief processing until the pressure value inside the main pipeline 1 drops to a safe value before subsequent operations are carried out. The temperature detection valve 8 is used to detect the temperature inside the main pipeline 1.

[0047] The pressure detection valve 6, the pressure relief valve 7, and the temperature detection valve 8 are all existing devices and will not be elaborated here.

[0048] Embodiment 2: Based on Embodiment 1, a modified structure of the external steam supply main pipeline of a thermal power plant includes a main pipeline 1. The end of the main pipeline 1 is connected to a flow dividing plate 2 and is connected to a plurality of flow dividing pipelines 4 through the flow dividing plate 2 for dividing the transported steam. A control valve 5 is installed inside the flow dividing pipeline 4.

[0049] Specifically, through the main pipeline 1, steam can be transported until the steam is divided and transported through the corresponding flow dividing pipelines 4. The control valve 5 is an existing device used to control the opening and closing of the flow dividing pipelines 4.

[0050] An inner disc frame 3 is rotatably connected inside the flow dividing plate 2. A plurality of flow dividing pipelines 4 are fixedly connected to the inner disc frame 3. The inner disc frame 3 is used to adjust the angles of the plurality of flow dividing pipelines 4. A sealing component is provided between the flow dividing plate 2 and the inner disc frame 3 to ensure the sealing between the two.

[0051] Through the setting of the inner disc frame 3, the assembly angle of the flow dividing pipelines 4 can be adjusted by rotating the inner disc frame 3 installed inside the flow dividing plate 2, thereby realizing the adjustment operation of the steam transportation angle and ensuring the assembly convenience of the equipment.

[0052] A return pipeline 10 is provided between the main pipeline 1 and the flow dividing plate 2. A return pipe 11 that is interconnected is fixedly installed at the bottom of the return pipeline 10 for discharging the liquid attached to the inner wall of the main pipeline 1.

[0053] A plugging head 12 is slidably installed at the end of the reflux pipeline 11. A limiting ring frame 15 is fixedly installed inside the reflux pipeline 11. A plurality of support springs 14 are fixedly installed between the limiting ring frame 15 and the plugging head 12. A plurality of liquid inlet holes 1202 are formed inside the plugging head 12. The top surface of the plugging head 12 is provided as an inclined surface and a sealing gasket 13 is rotatably installed, which is used to plug the end of the reflux pipeline 11 when the main pipeline 1 is conveying steam, with the sealing gasket 13 and the plugging head 12 being pressed;

[0054] Through the setting of the reflux pipeline 11, when the device is conveying steam, the plugging head 12 can be compressed and retracted into the reflux pipeline 11, and the end of the reflux pipeline 11 is plugged by the sealing gasket 13. At this time, the steam will not leak. After the steam conveying is completed, the plugging head 12 and the sealing gasket 13 can be driven to lift upward through the cooperation of the support springs 14. At this time, the liquid remaining in the main pipeline 1 can automatically drain through the liquid inlet holes 1202 and the reflux pipeline 11, further improving the maintenance convenience of the device;

[0055] A limiting notch 1201 is formed on the top surface of the plugging head 12. A rotating shaft 1301 is rotatably installed inside the limiting notch 1201. The sealing gasket 13 is rotatably connected to the rotating shaft 1301;

[0056] Through the rotating connection between the sealing gasket 13 and the plugging head 12, when the plugging head 12 is compressed and inserted into the reflux pipeline 11, the sealing gasket 13 can rotate along the rotating shaft 1301 under force until it fits with the end of the reflux pipeline 11, further ensuring the sealing effect;

[0057] A sealing ring 1302 is fixedly installed at the bottom of the sealing gasket 13, and the sealing ring 1302 is used to improve the sealing performance between the sealing gasket 13 and the reflux pipeline 11;

[0058] On both sides inside the limiting ring frame 15, limiting sleeves 16 are fixedly installed. An inner sliding rod 1601 is slidably installed inside the limiting sleeve 16. One end of the inner sliding rod 1601 away from the limiting sleeve 16 is fixedly connected to the plugging head 12. An airbag 1602 is fixedly installed at one end of the limiting sleeve 16 away from the inner sliding rod 1601. A connecting pull rope 1603 is fixedly installed between the airbag 1602 and the inner sliding rod 1601, and an exhaust hole is formed at the end of the airbag 1602;

[0059] Specifically, the driving of the plugging head 12 is driven by the steam pressure inside the main pipeline 1. When the steam is being transported, it can compress the sealing gasket 13 and drive the plugging head 12 to retract. At this time, the inner sliding rod 1601 can enter the limit sleeve 16 through the push of the plugging head 12 and compress the airbag 1602. At this time, the air inside the airbag 1602 can be discharged through the exhaust holes. When the steam transportation stops, the plugging head 12 and the sealing gasket 13 can be reset through the cooperation of the support spring 14, tension the connecting pull rope 1603, and make the air slowly enter the airbag 1602. Until the air completely enters the airbag 1602, the plugging head 12 moves to the uppermost position. Through the setting of the airbag 1602, the time required for the plugging head 12 to move upward can be extended, avoiding the high-temperature steam inside the main pipeline 1 from being discharged through the return pipeline 11, and further ensuring the operation effect and safety of the pipeline.

[0060] Specifically, a heating sheet 101 is fixedly installed inside the main pipeline 1. The heating sheet 101 is an existing device and is used to heat-treat the steam.

[0061] Specifically, positioning flanges 9 are provided between the main pipeline 1 and the ends of the return pipeline 10 and the flow dividing plate 2.

[0062] The sealing assembly includes a sealing gasket ring 303. The sealing gasket ring 303 is fixed inside the flow dividing plate 2. The inner disc frame 3 is in mutual contact with the sealing gasket ring 303. A limit ring piece 301 is fixedly installed on the outer side of the inner disc frame 3. A plurality of limit insertion rods 302 are slidably installed inside the limit ring piece 301, and reset springs 3021 are sleeved on the outer sides of the limit insertion rods 302.

[0063] When transporting the steam, the inner disc frame 3 can be pressed to squeeze the sealing gasket ring 303, thereby ensuring the sealing performance between the inner disc frame 3 and the flow dividing plate 2 and further ensuring the use effect of the pipeline. Through the cooperation of the limit insertion rods 302, the position of the inner disc frame 3 can be limited, and then the transportation angle of the flow dividing pipeline 4 can be locked.

[0064] A pressure detection valve 6, a pressure relief valve 7, and a temperature detection valve 8 are respectively fixedly installed inside the main pipeline 1. The pressure detection valve 6 is used to detect the pressure value inside the main pipeline 1. The pressure relief valve 7 is used for pressure relief operations. When the steam transportation inside the main pipeline 1 stops, the pressure relief valve 7 can perform pressure relief treatment until the pressure value inside the main pipeline 1 drops to a safe value and then subsequent operations can be carried out. The temperature detection valve 8 is used to detect the temperature inside the main pipeline 1.

[0065] The pressure detection valve 6, the pressure relief valve 7, and the temperature detection valve 8 are all existing devices and will not be elaborated here.

[0066] Furthermore, a drain pipe 17 is fixedly installed at the end of the return pipe 11, and a one-way valve 1701 is fixedly installed at the end of the drain pipe 17;

[0067] A liquid level monitor 1702 is fixedly installed inside the drain pipe 17;

[0068] Through the arrangement of the drain pipe 17 and the one-way valve 1701, the automatic discharge treatment of the liquid can be completed, and at the same time, external impurities are prevented from entering the inside of the drain pipe 17. When the liquid is discharged through the return pipe 11, it can enter the inside of the drain pipe 17. When the liquid level reaches the preset value, the one-way valve 1701 opens to discharge the liquid. On the one hand, the convenience of pipeline use can be improved, and on the other hand, the tightness during the conveying process of the main pipeline 1 can be ensured.

[0069] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0070] The above has described in detail an embodiment of the present invention, but the content described is only the preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the present invention.

Claims

1. A transformation structure of an external steam supply main pipeline of a thermal power plant, including a main pipeline (1), characterized in that: The end of the main pipeline (1) is connected to a shunt plate (2) and is connected to a plurality of shunt pipelines (4) through the shunt plate (2) for shunting the transported steam, and a control valve (5) is installed inside the shunt pipeline (4); An inner disc frame (3) is rotatably connected inside the shunt plate (2), and the plurality of shunt pipelines (4) are all fixedly connected to the inner disc frame (3). The inner disc frame (3) is used to adjust the angles of the plurality of shunt pipelines (4). A sealing assembly is provided between the shunt plate (2) and the inner disc frame (3) to ensure the sealing between the two; A return pipeline (10) is provided between the main pipeline (1) and the shunt plate (2). A return pipe (11) that is interconnected is fixedly installed at the bottom of the return pipeline (10) for discharging the liquid attached to the inner wall of the main pipeline (1); A plugging head (12) is slidably installed at the end of the return pipe (11). A limiting ring frame (15) is fixedly installed inside the return pipe (11). A plurality of support springs (14) are fixedly installed between the limiting ring frame (15) and the plugging head (12). A plurality of liquid inlet holes (1202) are opened inside the plugging head (12). The top surface of the plugging head (12) is provided as an inclined surface and a sealing gasket (13) is rotatably installed. When the main pipeline (1) is transporting steam, the sealing gasket (13) and the plugging head (12) are pressed to block the end of the return pipe (11).

2. The modified structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: A limiting notch (1201) is opened on the top surface of the plugging head (12), and a rotating shaft (1301) is rotatably installed inside the limiting notch (1201). The sealing gasket (13) is rotatably connected to the rotating shaft (1301).

3. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 2, characterized in that: A sealing ring (1302) is fixedly installed at the bottom of the sealing gasket (13).

4. The modified structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: Limiting sleeves (16) are fixedly installed on both sides inside the limiting ring frame (15), and inner sliding rods (1601) are slidably installed inside the limiting sleeves (16). One end of the inner sliding rod (1601) far away from the limiting sleeve (16) is fixedly connected to the plugging head (12). An airbag (1602) is fixedly installed at one end of the limiting sleeve (16) far away from the inner sliding rod (1601). An connecting pull rope (1603) is fixedly installed between the airbag (1602) and the inner sliding rod (1601), and an exhaust hole is opened at the end of the airbag (1602).

5. The retrofitting structure of the external steam supply main pipeline of a thermal power plant according to claim 1, wherein: A heating sheet (101) is fixedly installed inside the main pipeline (1).

6. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: Positioning flanges (9) are provided between the main pipeline (1) and the return pipeline (10) and at the ends of the shunt plate (2).

7. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: The sealing assembly includes a sealing gasket ring (303). The sealing gasket ring (303) is fixed inside the shunt plate (2). The inner disc frame (3) is mutually attached to the sealing gasket ring (303). A limiting ring piece (301) is fixedly installed on the outer side of the inner disc frame (3). A plurality of limiting insertion rods (302) are slidably installed inside the limiting ring piece (301), and return springs (3021) are sleeved on the outer sides of the limiting insertion rods (302).

8. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: A pressure detection valve (6), a pressure relief valve (7) and a temperature detection valve (8) are respectively and fixedly installed inside the main pipeline (1).

9. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 1, characterized in that: A drain pipe (17) is fixedly installed at the end of the return pipeline (11), and a one-way valve (1701) is fixedly installed at the end of the drain pipe (17).

10. The retrofit structure of the external steam supply main pipeline of a thermal power plant according to claim 9, characterized in that: A liquid level monitor (1702) is fixedly installed inside the drain pipe (17).

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