Intelligent switching and connecting system for high-pressure heater and control method thereof

Abstract

This application belongs to the field of feedwater heating technology for thermal power generation, specifically disclosing an intelligent switching and connection system for high-pressure heaters and its control method. The system includes: several high-pressure heaters arranged in series; a bypass pipe, the front end of which is connected to the inlet of the first high-pressure heater via a first-end high-pressure heater connection valve, and the rear end of which is connected to the outlet of the last high-pressure heater via a tail-end high-pressure heater connection valve; a connecting pipe, one end of which is connected to the bypass pipe, and the other end of which is connected to the pipe between two adjacent high-pressure heaters; electric valves are installed on both the connecting pipe and the pipe between two adjacent high-pressure heaters, specifically on the section before the connecting pipe interface and the section after the connecting pipe structure; and a control unit connected to the electric valves. Through the cooperation of the connecting pipe and the electric valves, the water flow path can be switched in the event of a single heater failure, while retaining the heating function of other high-pressure heaters, thus solving the problem in traditional series systems where a single high-pressure heater failure requires the entire system to be disconnected.

Description

Technical Field

[0001] This application relates to the field of feedwater heating technology for thermal power generation, and in particular to an intelligent switching and connection system for high-pressure heaters and its control method. Background Technology

[0002] The regenerative system of a thermal power generating unit is a key component for improving unit thermal efficiency and reducing coal consumption. The high-pressure heater, as an important part of the regenerative system, significantly increases the feedwater temperature by using steam extracted from the turbine to heat the boiler feedwater, thereby reducing boiler fuel consumption and improving overall thermal efficiency. In small and medium-sized units, two high-pressure heaters are typically installed and operate in series, meaning the feedwater is heated sequentially through both heaters.

[0003] Currently, in existing thermal power generating units, when high-pressure heaters are connected in series, if one of them fails, both high-pressure heaters typically need to be disconnected and shut down simultaneously to avoid further damage to the unit's operation. During maintenance or troubleshooting, if feedwater that has not been heated by the high-pressure heaters is directly supplied through a bypass pipeline, the unit can only operate with a lower feedwater temperature; the aforementioned process presents the following problems: Impaired operational stability and thermal efficiency: When a high-pressure heater fails and stops operating, in order to maintain the boiler's evaporation rate, it is often necessary to increase fuel consumption, which leads to increased heat loss and significantly reduces the overall thermal efficiency of the unit. Feedwater quality issues: After the series operation is disconnected, the feedwater temperature decreases, which may lead to excessive dissolved oxygen content and adversely affect the boiler water quality. Equipment safety risks: Low-temperature water supply may cause low-temperature corrosion of water-cooled wall tubes, which may lead to tube rupture and shorten the equipment's operating cycle; Unit output limitation: During the fault, the unit cannot operate stably at high feedwater temperature, which may lead to a decrease in unit output or forced load reduction; Long maintenance time and significant impact: When a fault occurs, it requires a long period of shutdown for repair, which has a significant impact on the power plant's production plan and economic benefits.

[0004] In addition, the faults of the high-pressure heater itself should not be ignored. For example, the steam flow inside a traditional high-pressure heater is relatively turbulent, especially at the inlet, which can easily cause a large impact on the internal tube bundle. Over time, the connection of the tube bundle will loosen, affecting the normal operation of the equipment. Summary of the Invention

[0005] The purpose of this application is to provide a high-pressure heater intelligent switching and connection system and its control method to solve the above problems.

[0006] To achieve the above objectives, the technical solution of this application is as follows: A high-pressure heater intelligent switching and connection system includes: Several high-pressure heaters connected in series; A bypass pipe, the front end of which is connected to the inlet of the first high-pressure heater via a first-end high-pressure heater connection valve, and the rear end of which is connected to the outlet of the last high-pressure heater via a tail-end high-pressure heater connection valve; The connecting pipeline has one end connected to the bypass pipeline and the other end connected to the pipeline between two adjacent high-pressure heaters; electric valves are provided on the connecting pipeline and the pipeline between the two adjacent high-pressure heaters, both in the section before the connecting pipeline interface and in the section after the connecting pipeline structure. The control unit is connected to the electric valve via a signal.

[0007] Preferably, a check valve is provided on both the section of the pipeline between two adjacent high-pressure heaters before the connecting pipeline interface and the section after the connecting pipeline structure.

[0008] Preferably, the number of high-pressure heaters is two, namely a first high-pressure heater and a second high-pressure heater; The electric valve and the check valve are each in pairs, and are arranged in the following order according to the water flow direction: first check valve, first electric valve, second electric valve, and second check valve.

[0009] Preferably, the control unit is a power plant distributed control system, which has preset control logic for the operation of a single high-voltage heater.

[0010] Preferably, the high-pressure heater has a buffer sleeve inside corresponding to the steam inlet. The bottom of the buffer sleeve has an upwardly protruding arc-shaped perforated plate. The bottom of the arc-shaped perforated plate has a conical flow divider. The bottom of the conical flow divider has a flow divider ring. The flow divider ring has flow divider holes that allow the steam flow to move radially.

[0011] Preferably, the bottom of the high-pressure heater is provided with a spiral centrifuge tube, the inner side of the spiral centrifuge tube is provided with an opening for steam discharge, the outer side is provided with a centrifuge hole for condensate discharge, the periphery of the spiral centrifuge tube is provided with a condensation pipe, the top of the condensation pipe is connected to a steam return pipe connected to the steam cooling section of the high-pressure heater, and the steam return pipe is provided with a one-way valve.

[0012] Preferably, the high-pressure heater has multiple layers of tube bundles arranged from the outside to the inside, and the tube bundles are connected to the inner wall of the high-pressure heater by connecting brackets.

[0013] Preferably, a connecting plate is provided on the outermost tube bundle, and buffers are provided on both the upper and lower sides of the connecting plate. The buffers include a damping rod and a spring sleeved on the outside of the damping rod. The two ends of the damping rod are connected to the connecting plate and the inner wall of the high-pressure heater, and the two ends of the spring abut against the connecting plate and the inner wall of the high-pressure heater, respectively.

[0014] A control method for the intelligent switching and connection system of the high-pressure heater according to any one of the preceding claims, comprising: When a fault is detected in the first high-pressure heater, the following operations are performed: By controlling the connecting valve at the head end of the high-pressure heater to prevent feedwater from entering the first high-pressure heater; closing the first electric valve and opening the corresponding electric valve on the connecting pipeline; controlling the feedwater to enter the inlet of the second high-pressure heater through the connecting pipeline and opening the second electric valve, finally the feedwater enters the boiler. When a malfunction is detected in the second high-pressure heater, the following steps are performed: Close the second electric valve; control the feedwater to pass through the first electric valve and open the corresponding electric valve on the connecting pipe; the feedwater enters the bypass pipe through the connecting pipe and finally enters the boiler through the bypass pipe.

[0015] Preferably, the operation is implemented through a logic program preset in the power plant's distributed control system.

[0016] The intelligent switching and connection system for high-pressure heaters disclosed in this application can switch the water flow path when a single unit fails, by coordinating the connection pipeline and electric valve, while retaining the heating function of other normal high-pressure heaters and maintaining a high feedwater temperature. This reduces fuel consumption, avoids feedwater quality deterioration, reduces equipment safety risks, and shortens the time that fault handling affects unit operation. It solves the problem that in traditional series systems, a single high-pressure heater failure requires the entire system to be disconnected. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pipeline connection in this application; Figure 2 This is a schematic diagram of the high-pressure heater structure of this application; Figure 3 This is a perspective view of the high-pressure heater structure of this application; Figure 4 This is another angle view of the high-pressure heater structure of this application; Figure 5 This is a top view of the high-pressure heater structure of this application; Figure 6 for Figure 5 Sectional view of section AA; Figure 7 for Figure 6Enlarged view of a portion of point A in the middle; Figure 8 for Figure 6 Enlarged view of a portion of point B in the middle; Figure 9 for Figure 5 Sectional view of section BB; Figure 10 This is another angle view of the high-pressure heater structure of this application.

[0018] In the picture: 1. First high-pressure heater; 10. Initial high-pressure heater connecting valve; 11. First check valve; 12. First electric valve; 2. Second high-pressure heater; 20. Tail-end high-pressure heater connecting valve; 21. Second electric valve; 22. Second check valve; 3. Bypass pipe; 4. Connecting pipe; 50. Water inlet; 51. Preheating pipe; 52. Preheating chamber; 53. Preheating port; 54. Condensation pipe; 540. Spiral centrifuge tube; 541. Opening; 542. Centrifuge hole; 55. Steam inlet; 56. Water outlet; 57. Steam return pipe; 6. Tube bundle; 60. Connecting plate; 61. Damping rod; 62. Spring; 7. Connecting frame; 8. Steam cooling section; 90. Buffer sleeve; 91. Arc-shaped perforated plate; 92. Conical diverter shroud; 93. Diverter ring; 94. Diverter hole. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams, illustrating only the basic structure of the present application, and therefore only show the components relevant to the present application.

[0020] like Figure 1-10 As shown, a high-pressure heater intelligent switching and connection system includes: Several high-pressure heaters are connected in series. Several high-pressure heaters are connected in series in the direction of feedwater flow to form a stepped heating path, so that the feedwater is gradually heated as it flows through each high-pressure heater, thereby increasing the final feedwater temperature to meet the boiler requirements.

[0021] Bypass pipe 3 is connected at its front end to the inlet of the first high-pressure heater via the first high-pressure heater connection valve 10, and at its rear end to the outlet of the last high-pressure heater via the last high-pressure heater connection valve 20. During normal operation, one of the first high-pressure heater connection valves 10 and 20 connected to bypass pipe 3 is closed to ensure that all feedwater flows through the high-pressure heater. When it is necessary to disconnect the high-pressure heater as a whole, the one connected to bypass pipe 3 is opened, and feedwater can be directly delivered through bypass pipe 3.

[0022] In some other embodiments, the head-end high-pressure heater connecting valve 10 and the tail-end high-pressure heater connecting valve 20 are three-way valves.

[0023] Connecting pipe 4 is connected at one end to bypass pipe 3 and at the other end to the pipe between two adjacent high-pressure heaters. Electric valves are installed on both the section of connecting pipe 4 before the interface and the section of connecting pipe 4 after the structure of connecting pipe 4 on both the connecting pipe 4 and the pipe between the two adjacent high-pressure heaters. One end of connecting pipe 4 is connected to the middle area of ​​bypass pipe 3 and the other end is connected to the pipe between the two adjacent high-pressure heaters, forming a bridging channel. At the same time, electric valves are installed on the pipes between the two adjacent high-pressure heaters, on the pipes before (according to the water flow direction) and after the interface of connecting pipe 4. Electric valves are also installed on connecting pipe 4 to control the opening and closing of the corresponding pipes.

[0024] The control unit is connected to the electric valves via signal. The control unit establishes a signal connection with all electric valves via wired or wireless means, and can receive valve status feedback and send opening and closing commands.

[0025] By coordinating the connecting pipeline 4 and the electric valve, the water flow path can be switched when a single unit fails, while preserving the heating function of other normal high-pressure heaters and maintaining a high feedwater temperature. This reduces fuel consumption, prevents feedwater quality deterioration, lowers equipment safety risks, and shortens the time that fault handling affects unit operation. It also solves the problem that in traditional series systems, a single high-pressure heater failure requires the entire system to be disconnected.

[0026] In some other embodiments, the number of high-pressure heaters can be flexibly set according to the unit capacity, and the electric valves can be intelligent valves with feedback function, which facilitates the control unit to monitor the status in real time.

[0027] In some further embodiments, a check valve is provided on both the section of the pipeline between two adjacent high-pressure heaters before the interface of the connecting pipeline 4 and the section after the structure of the connecting pipeline 4.

[0028] The check valve opens in the same direction as the water supply flow, allowing water to flow only along the normal heating path and preventing backflow.

[0029] Check valves can enhance the system's anti-interference capability, prevent water flow from back impacting the internal structure of the high-pressure heater due to pressure changes or malfunctions during valve switching, prevent abnormal fluctuations in water temperature and pressure, and further ensure the stability of unit operation.

[0030] In practice, check valves can be either lift or swing type. The appropriate model should be selected according to the pipeline diameter and pressure parameters. The sealing surface is made of wear-resistant material to extend its service life.

[0031] In some further embodiments, there are two high-pressure heaters, namely a first high-pressure heater 1 and a second high-pressure heater 2; There are two electric valves and two check valves, arranged in the order of water flow direction as follows: first check valve 11, first electric valve 12, second electric valve 21, and second check valve 22.

[0032] When there are two high-pressure heaters, they are defined as the first high-pressure heater 1 (upstream) and the second high-pressure heater 2 (downstream). The two are connected in series through connecting pipes. The water first flows through the first high-pressure heater 1 and then enters the second high-pressure heater 2.

[0033] Two electric valves and two check valves are provided, arranged in the following order according to the water flow direction: First check valve 11 (located between the outlet of the first high-pressure heater 1 and the interface of the connecting pipe 4), first electric valve 12 (downstream of the first check valve 11), second electric valve 21 (located between the interface of the connecting pipe 4 and the inlet of the second high-pressure heater 2), and second check valve 22 (downstream of the second electric valve 21).

[0034] In some further embodiments, the control unit is a power plant distributed control system, which has pre-set control logic for the operation of a single high-voltage heater.

[0035] The control unit utilizes the power plant's existing distributed control system (DCS). This system uses integrated sensors to collect real-time operating parameters of the high-pressure heaters (such as inlet and outlet temperatures, pressure, and liquid levels) and the status of each valve. The DCS has pre-set control logic for the operation of a single high-pressure heater, including fault judgment conditions (such as sudden temperature drops, abnormal pressure, etc.), valve switching sequence, and water flow path optimization programs. Its core effect is to achieve intelligent switching using the power plant's existing control system without the need for additional control equipment, reducing the difficulty and cost of modification; the pre-set logic ensures rapid response in the event of a fault, automatically completing valve switching, reducing manual intervention, avoiding operational errors, and ensuring the stability of feedwater temperature and flow rate during switching, maintaining efficient unit operation.

[0036] In some further embodiments, the interior of the high-pressure heater is provided with a buffer sleeve 90 corresponding to the steam inlet 55. The bottom of the buffer sleeve 90 is provided with an upwardly protruding arc-shaped perforated plate 91. The bottom of the arc-shaped perforated plate 91 is provided with a conical flow divider 92. The bottom of the conical flow divider 92 is provided with a flow divider ring 93. The flow divider ring 93 is provided with a flow divider hole 94 that allows the steam flow to move radially.

[0037] Inside the high-pressure heater, a buffer sleeve 90 is fixedly installed at the position corresponding to the steam inlet 55. The buffer sleeve 90 has a cylindrical structure and surrounds the steam inlet 55, which plays a preliminary deceleration and buffering role for the high-speed steam that has just entered.

[0038] The bottom of the buffer sleeve 90 is connected to an upwardly protruding arc-shaped perforated plate 91. The arc-shaped perforated plate 91 faces the steam inlet 55. Multiple through holes are evenly distributed on the plate. When the steam passes through the holes, it is dispersed, reducing the local flow velocity.

[0039] The bottom of the arc-shaped perforated plate 91 is connected to the conical diverter 92, with the tip of the conical structure facing the steam inlet 55, further guiding the dispersed steam to the surroundings to avoid concentrated impact.

[0040] The bottom of the conical flow divider 92 is connected to the flow divider ring 93. The flow divider ring 93 is annular, and multiple flow divider holes 94 are opened on the ring wall in a radial (horizontal) manner. After the steam passes through the flow divider holes 94, it diffuses radially and flows through the tube bundle 6 region.

[0041] By using multi-stage buffering and diversion, the impact force of steam on tube bundle 6 is reduced, the risk of loosening of tube bundle 6 is reduced, and the service life of the equipment is extended.

[0042] In some further embodiments, the bottom of the high-pressure heater is provided with a spiral centrifugal tube 540, the inner side of the spiral centrifugal tube 540 is provided with an opening 541 for steam discharge, the outer side is provided with a centrifugal hole 542 for condensate discharge, the periphery of the spiral centrifugal tube 540 is provided with a condensation pipe 54, the top of the condensation pipe is connected to a steam return pipe 57 connected to the steam cooling section 8 of the high-pressure heater, and a one-way valve is provided on the steam return pipe 57.

[0043] A spiral centrifuge tube 540 is installed at the bottom of the high-pressure heater. The spiral centrifuge tube 540 extends spirally along the axial direction. A spiral opening 541 is opened on its inner wall (near the center of the spiral) to discharge uncondensed steam. Multiple centrifuge holes 542 are opened on the outer wall. The centrifugal force generated by the spiral motion is used to make the condensate formed by the condensation of steam throw out through the centrifuge holes 542.

[0044] A condenser pipe 54 is provided around the spiral centrifuge tube 540. The spiral centrifuge tube 540 is located inside the condenser pipe 54. The condensate thrown out from the centrifuge hole 542 will be discharged from the outlet through the condenser pipe 54.

[0045] The top of the condenser pipe 54 is connected to the steam return pipe 57. The other end of the steam return pipe 57 is connected to the steam cooling section 8 of the high-pressure heater. A one-way valve is installed on the steam return pipe 57, which only allows uncondensed steam to return from the spiral centrifugal tube 540 to the cooling section through the return pipe to participate in the heating again.

[0046] The spiral centrifugal separator achieves efficient separation of steam and condensate, allowing the condensate to be discharged in time to avoid affecting heating efficiency, while the uncondensed steam is recycled to reduce heat loss.

[0047] The one-way valve is used to prevent steam from flowing back into the spiral centrifuge tube 540 in the cooling section, thus ensuring the separation effect.

[0048] The connection between the condenser pipe 54 and the steam return pipe 57 is chamfered to collect steam and ensure the return effect.

[0049] In some further embodiments, the interior of the high-pressure heater is provided with multiple layers of tube bundles 6 from the outside to the inside, and the tube bundles 6 are connected to the inner wall of the high-pressure heater by connecting brackets 7.

[0050] Inside the high-pressure heater, multiple layers of tube bundles 6 are arranged radially from the outside to the inside. Each layer of tube bundles 6 consists of multiple parallel heat exchange tubes, forming multiple heating zones.

[0051] The tube bundles 6 are fixedly connected by connecting brackets 7. The two ends of the connecting brackets 7 are connected to the inner wall of the high-pressure heater to ensure that the multi-layer tube bundles 6 are stable inside the equipment and do not shake or shift.

[0052] In some further embodiments, a connecting plate 60 is provided on the outermost tube bundle 6, and buffers are provided on both the upper and lower sides of the connecting plate 60. The buffers include a damping rod 61 and a spring 62 sleeved on the outside of the damping rod 61. The two ends of the damping rod 61 are connected to the connecting plate 60 and the inner wall of the high-pressure heater, and the two ends of the spring 62 abut against the connecting plate 60 and the inner wall of the high-pressure heater, respectively.

[0053] A connecting plate 60 is fixedly connected to the outermost tube bundle 6 on its outer side wall, and the connecting plate 60 extends along the length of the tube bundle 6. Buffers are installed on both the upper and lower sides of the connecting plate 60. Each buffer includes a damping rod 61 and a spring 62 sleeved on the outside of the damping rod 61. One end of the damping rod 61 is connected to the connecting plate 60, and the other end is connected to the inner wall of the high-pressure heater. One end of the spring 62 abuts against the connecting plate 60, and the other end abuts against the inner wall of the high-pressure heater, forming an elastic support structure.

[0054] When the tube bundle 6 is subjected to steam impact, the spring 62 absorbs part of the impact force through elastic deformation, while the damping rod 61 attenuates the vibration energy through damping. The two work together to reduce the vibration amplitude and stress of the tube bundle 6, further protecting the tube bundle 6, avoiding long-term vibration that could cause the tube bundle 6 and connecting parts to loosen, reducing the risk of failure, and extending the maintenance cycle of the equipment.

[0055] The high-pressure heater is equipped with an inlet 50 and an outlet 56; The bottom of the high-pressure heater is also provided with a preheating chamber 52, which is connected to the water inlet 50 pipe. The preheating chamber 52 is provided with a preheating port 53. When supplying water, it can be added first through the preheating port 53, and then enter the preheating chamber 52 to preheat the water supply by utilizing the residual heat of the condensate at the bottom of the high-pressure heater. After that, it enters the interior of the high-pressure heater through the water inlet 50 via the preheating pipe 51.

[0056] A control method for a high-pressure heater intelligent switching and connection system includes: When a malfunction is detected in the first high-pressure heater 1, the following operations are performed: By controlling the first high-pressure heater connecting valve 10 to prevent feedwater from entering the first high-pressure heater 1; closing the first electric valve 12 and opening the corresponding electric valve on the connecting pipe; controlling the feedwater to enter the inlet of the second high-pressure heater 2 through the connecting pipe and opening the second electric valve 21, finally entering the boiler. When a malfunction is detected in the second high-pressure heater 2, the following operations are performed: Close the second electric valve 21; control the feedwater to pass through the first electric valve 12 and open the corresponding electric valve on the connecting pipeline 4; the feedwater enters the bypass pipeline 3 through the connecting pipeline 4, and finally enters the boiler through the bypass pipeline 3.

[0057] This control method is mainly used to achieve precise switching when a single high-pressure heater fails, ensuring that at least one high-pressure heater continues to work (the second high-pressure heater is retained when the first high-pressure heater 1 fails, and the first high-pressure heater is retained when the second high-pressure heater fails), maintaining a high feedwater temperature, and solving problems such as low thermal efficiency and poor feedwater quality caused by traditional full disconnection.

[0058] In practice, fault detection can be achieved through real-time monitoring of preset temperature and pressure sensors in the DCS. When the parameters exceed the preset threshold, the switching process is automatically triggered.

[0059] In some further embodiments, the operation is implemented through a logic program preset in the power plant's distributed control system.

[0060] All operational steps in the above control method are automatically executed through a logic program preset in the power plant's distributed control system (DCS) to achieve fully automated control, reduce response time and errors of manual operation, and ensure the stability and safety of the switching process. At the same time, the logic program can be visually edited and debugged in the DCS, making it easy to optimize the switching strategy according to the unit's operating requirements.

[0061] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A high-pressure heater intelligent switching and connection system, characterized in that, include: Several high-pressure heaters connected in series; Bypass pipe (3), the front end of the bypass pipe (3) is connected to the inlet of the first high-pressure heater through the first high-pressure heater connection valve (10), and the rear end is connected to the outlet of the last high-pressure heater through the tail high-pressure heater connection valve (20); The connecting pipeline (4) is connected at one end to the bypass pipeline (3) and at the other end to the pipeline between two adjacent high-pressure heaters; the connecting pipeline (4) and the pipeline between two adjacent high-pressure heaters are equipped with electric valves in the section before the interface of the connecting pipeline (4) and the section after the structure of the connecting pipeline (4); The control unit is connected to the electric valve via a signal.

2. The intelligent switching and connection system for high-pressure heaters according to claim 1, characterized in that, Check valves are provided on the section of the pipeline between two adjacent high-pressure heaters before the interface of the connecting pipeline (4) and the section after the structure of the connecting pipeline (4).

3. The intelligent switching and connection system for high-pressure heaters according to claim 2, characterized in that, The number of high-pressure heaters is two, namely the first high-pressure heater (1) and the second high-pressure heater (2). The electric valve and the check valve are each in pairs, and in order of water flow direction, they are the first check valve (11), the first electric valve (12), the second electric valve (21), and the second check valve (22).

4. The intelligent switching and connection system for high-pressure heaters according to claim 1 or 3, characterized in that, The control unit is a power plant distributed control system, which has preset control logic for the operation of a single high-voltage heater.

5. The intelligent switching and connection system for high-pressure heaters according to claim 1, characterized in that, The high-pressure heater is provided with a buffer sleeve (90) corresponding to the steam inlet (55). The bottom of the buffer sleeve (90) is provided with an upwardly protruding arc-shaped perforated plate (91). The bottom of the arc-shaped perforated plate (91) is provided with a conical flow divider (92). The bottom of the conical flow divider (92) is provided with a flow divider ring (93). The flow divider ring (93) is provided with a flow divider hole (94) that allows the steam flow to move radially.

6. The intelligent switching and connection system for high-pressure heaters according to claim 1, characterized in that, The bottom of the high-pressure heater is provided with a spiral centrifuge tube (540). The inner side of the spiral centrifuge tube (540) is provided with an opening (541) for steam discharge, and the outer side is provided with a centrifuge hole (542) for condensate discharge. The outer periphery of the spiral centrifuge tube (540) is provided with a condensation pipe (54). The top of the condensation pipe is connected to a steam return pipe (57) that is connected to the steam cooling section (8) of the high-pressure heater. A one-way valve is provided on the steam return pipe (57).

7. The intelligent switching and connection system for high-pressure heaters according to claim 1, characterized in that, The high-pressure heater has multiple layers of tube bundles (6) arranged from the outside to the inside, and the tube bundles (6) are connected to the inner wall of the high-pressure heater by connecting brackets (7).

8. The intelligent switching and connection system for high-pressure heaters according to claim 7, characterized in that, A connecting plate (60) is provided on the outermost tube bundle (6). Buffers are provided on both the upper and lower sides of the connecting plate (60). The buffer includes a damping rod (61) and a spring (62) sleeved on the outside of the damping rod (61). The two ends of the damping rod (61) are connected to the connecting plate (60) and the inner wall of the high-pressure heater. The two ends of the spring (62) abut against the connecting plate (60) and the inner wall of the high-pressure heater, respectively.

9. A control method for the intelligent switching and connection system of the high-pressure heater according to any one of claims 1-8, characterized in that, include: When a fault is detected in the first high-pressure heater (1), the following operations are performed: By controlling the first high-pressure heater connecting valve (10) to prevent feedwater from entering the first high-pressure heater (1); closing the first electric valve (12) and opening the corresponding electric valve on the connecting pipe; controlling the feedwater to enter the inlet of the second high-pressure heater (2) through the connecting pipe and opening the second electric valve (21), finally entering the boiler. When a fault is detected in the second high-pressure heater (2), the following operations are performed: Close the second electric valve (21); control the feedwater to pass through the first electric valve (12) and open the corresponding electric valve on the connecting pipeline (4); the feedwater enters the bypass pipeline (3) through the connecting pipeline (4) and finally enters the boiler through the bypass pipeline (3).

10. The control method according to claim 9, characterized in that, The operation is implemented through a logic program preset in the power plant's distributed control system.

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