Preheating facility for demineralized water of power plant

Abstract

The invention discloses a preheating facility for demineralized water of a power plant, and relates to the technical field of heat exchangers. The heat exchanger comprises a heat exchange box, a crossed cavity is formed in the middle of the heat exchange box, an upper heat exchange cavity and a lower heat exchange cavity which are distributed up and down are formed in the two sides of the crossed cavity, an upper heat medium cavity is formed in the side, away from the crossed cavity, of the upper heat exchange cavity, and a lower heat medium cavity is formed in the side, away from the crossed cavity, of the lower heat exchange cavity; flow guide holes are formed between the crossed cavity and the upper heat exchange cavity and between the crossed cavity and the lower heat exchange cavity, a through hole is formed between the upper heat exchange cavity and the lower heat exchange cavity, lifting windows are arranged between the upper heat exchange cavity and the upper heat medium cavity and between the lower heat exchange cavity and the lower heat medium cavity, and two Z-shaped heat exchange pipe sets are arranged in the heat exchange box. The angle of the inclined pipe is adjustable, and the height difference of an inlet and an outlet can be changed during adjustment, so that the device can be suitable for different working conditions, and the problems of local overheating, supercooling or unsmooth flowing caused by uneven pressure or flow velocity mismatching are solved.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a preheating facility for desalted water in a power plant. Background Art

[0002] Desalted water in thermal power plants (usually 20 to 40 t / h and 4 to 25°C) is primarily used to replenish normal water losses in the system. Because the quantity is relatively small, its addition to the condenser has little effect on the condensate temperature. However, since the heating units continuously supply steam to the outside (tens to hundreds of tons per hour), a relatively large amount of desalted water needs to be added, which lowers the condensate temperature and requires burning more coal, significantly increasing boiler coal consumption. Therefore, heat exchange is necessary. Tubular heat exchangers are a common type of heat exchange equipment, widely used in various water treatment systems in power plants. The structure of a tubular heat exchanger typically consists of multiple internal and external pipes. Fluid flows through the tubes, and heat is transferred to the fluid outside the tubes through the tube walls, or vice versa.

[0003] A Chinese patent (publication number: CN104949552B) discloses a shell-and-tube heat exchanger, which primarily comprises a shell, tube boxes located on both sides of the shell, tube sheets located between the tube boxes and the shell, and heat exchange tubes housed within the shell. A shell-side fluid inlet is provided on the shell outer wall near one end edge of the shell, and a shell-side fluid outlet is provided on the shell outer wall near the other end edge of the shell. Coolant enters the shell through the shell-side fluid inlet and flows through the gaps between the heat exchange tubes through the shell-side fluid outlet. A tube-side fluid inlet is provided on the tube box at one end of the shell-side fluid inlet, and a tube-side fluid outlet is provided on the other tube box. Both ends of the heat exchange tubes are fixed to the tube sheets, and both end openings of the heat exchange tubes are located in the tube boxes. Multiple sets of arched plates and circular plates are spaced apart within the shell, extending from the shell-side fluid inlet to the shell-side fluid outlet. A center hole is provided in the center of each arched plate for the flow of coolant, and a circle of drain holes is provided along the edge of the circular plate for the flow of coolant.

[0004] This patent and the prior art have the following technical problems in actual use: 1. Traditional tubular heat exchangers typically use a linear flow design, resulting in a relatively smooth fluid flow and a tendency to form laminar flow. Laminar flow has low heat transfer efficiency and is unable to fully utilize the temperature difference between the fluid and the tube wall. Some tubular heat exchangers use spiral or U-shaped pipe designs. While this improves heat transfer efficiency, it significantly affects fluid pressure. Under different operating conditions, uneven pressure or mismatched flow rates can easily lead to localized overheating, overcooling, or poor flow.

[0005] 2. When traditional tubular heat exchangers exchange desalted water, impurities easily accumulate inside the pipes, requiring regular maintenance and cleaning. Cleaning requires a long equipment downtime and is difficult. At the same time, a group of tubular heat exchangers can only use one heat source medium for heat exchange, and the heat exchange effect cannot be adjusted according to different working conditions, resulting in poor system adaptability. Summary of the Invention

[0006] The purpose of the present invention is to solve the above problems and provide a preheating facility for desalted water in a power plant.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A preheating facility for desalted water in a power plant includes a heat exchange box, wherein a cross chamber is provided in the middle of the heat exchange box, and an upper heat exchange chamber and a lower heat exchange chamber are provided on both sides of the cross chamber, the upper heat exchange chamber is provided on a side of the upper heat exchange chamber away from the cross chamber, and the lower heat exchange chamber is provided on a side of the lower heat exchange chamber away from the cross chamber. Diversion holes are provided between the cross chamber and the upper and lower heat exchange chambers, a through hole is provided between the upper and lower heat exchange chambers, and lifting windows are provided between the upper heat exchange chamber and the upper heat exchange chamber, and between the lower heat exchange chamber and the lower heat exchange chamber. Two groups of Z-shaped heat exchange tube groups are provided inside the heat exchange box. The Z-shaped heat exchange tube group includes multiple oblique tubes distributed in a linear array. The middle of the oblique tube is rotatably installed in the cross cavity. The oblique tubes of the two groups of Z-shaped heat exchange tube groups are cross-distributed. Both ends of the oblique tubes are provided with hinged joints. Horizontal tubes are hinged in the two groups of hinged joints. The horizontal tubes are connected to the oblique tubes through connecting hoses. A guide plate is provided on the outside of the horizontal tube. The guide plate can block the guide hole. A telescopic tube is provided on the end of the horizontal tube away from the oblique tube. The lifting window is slidably connected to the lifting window plate on the side away from the cross cavity. The telescopic tube is fixedly installed on the lifting window plate.

[0008] Furthermore, the top ends of the inclined tubes are connected in series via a connecting shaft, an arc-shaped guide opening is provided on the inner wall of the cross cavity, the center of the arc-shaped guide opening is on the same axis as the rotation center of the inclined tube, and the connecting shaft can slide along the arc-shaped guide opening.

[0009] Furthermore, two sets of telescopic cylinders are fixedly installed on the top of the heat exchange box, and a driving rod is fixedly installed on the telescopic end of the telescopic cylinder. A vertical guide groove is opened inside the driving rod. A sealing arc plate is fixedly installed on one end of the connecting shaft passing through the arc guide port. The sealing arc plate and the arc guide port are slidingly sealed. A transmission guide column is provided on the outside of the sealing arc plate, and the transmission guide column is inserted into the vertical guide groove.

[0010] Furthermore, connecting pipe openings are provided on the top and bottom of the cross cavity, the top of the upper heat exchange cavity, the bottom of the lower heat exchange cavity, and the outer sides of the upper heat medium cavity and the lower heat medium cavity.

[0011] Furthermore, a connecting flange is provided on the connecting pipe mouth.

[0012] Furthermore, the inner bottom of the upper heat exchange chamber and the inner top of the lower heat exchange chamber are both provided with valve plate assemblies, and the valve plate assembly consists of a valve plate and a connecting swing plate. The valve plate is slidably connected to the inner bottom of the upper heat exchange chamber, and a valve hole corresponding to the through hole is opened inside the valve plate. The two ends of the connecting swing plate are flexibly connected to the valve plate and the horizontal pipe respectively.

[0013] Furthermore, the flexible connection adopts copper sheet.

[0014] Furthermore, the valve hole and the through hole are both rectangular strips.

[0015] Furthermore, both ends of the guide plate and the guide hole are designed to be semicircular, the semicircular radius of the guide hole is the same as the outer diameter of the horizontal pipe, and the semicircular radius of the guide plate is larger than the outer diameter of the horizontal pipe.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention adopts a cross design of two groups of Z-shaped heat exchange tube groups as heat exchange tube groups, which makes the flow path of the fluid in the heat exchange tube become tortuous, increasing the turbulence of the fluid. Turbulence will promote faster heat transfer from the fluid to the tube wall. At the same time, under the guidance of the two groups of Z-shaped heat exchange tube groups, the desalted water can contact the pipe more evenly, thereby improving the heat exchange efficiency. The height difference between the inlet and outlet can also be used to reduce pressure loss, thereby reducing the pressure loss caused by heat exchange.

[0017] 2. The present invention has an adjustable angle of the inclined tube, and the height difference between the inlet and outlet can be changed during adjustment, so that the device can be applied to different working conditions, and prevent problems such as local overheating, overcooling or poor flow caused by uneven pressure or mismatched flow rates.

[0018] 3. The present invention can guide the flow of desalted water by setting the guide plate and the guide hole, so that it can pass through the heat exchange tube group more evenly. By adjusting the angle of the inclined tube, the guide plate can block the guide hole, which can change the heat exchange space in the heat exchange box, so that the equipment can be cleaned without stopping. It can also adjust the heat exchange of multiple media according to different working conditions, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 Schematic diagram of the heat exchange box structure of the present invention; Figure 4 This is a schematic diagram of the cross structure of two groups of Z-shaped heat exchange tube groups in the present invention Figure 1 ; Figure 5This is a schematic diagram of the cross structure of two groups of Z-shaped heat exchange tube groups in the present invention Figure 2 ; Figure 6 This is a schematic structural diagram of a Z-shaped heat exchange tube group according to the present invention; Figure 7 It is a structural schematic diagram of the valve plate assembly of the present invention.

[0020] Figure numerals: 1. heat exchange box; 11. cross cavity; 12. arc-shaped guide port; 13. upper heat exchange cavity; 14. lower heat exchange cavity; 15. upper heat medium cavity; 16. lower heat medium cavity; 17. guide hole; 18. through hole; 19. lifting window; 2. inclined tube; 21. hinged joint; 22. horizontal tube; 23. connecting hose; 24. telescopic tube; 25. lifting window plate; 26. guide plate; 27. sealing arc plate; 28. transmission guide column; 3. valve plate assembly; 31. valve plate; 32. connecting swing plate; 33. valve hole; 4. telescopic cylinder; 5. driving rod. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Example 1, as Figure 1-Figure 7 As shown, a preheating facility for desalted water in a power plant includes a heat exchange box 1. A cross chamber 11 is provided in the middle of the heat exchange box 1. An upper heat exchange chamber 13 and a lower heat exchange chamber 14 are provided on both sides of the cross chamber 11. An upper heat medium chamber 15 is provided on the side of the upper heat exchange chamber 13 away from the cross chamber 11. A lower heat medium chamber 16 is provided on the side of the lower heat exchange chamber 14 away from the cross chamber 11. A guide hole 17 is provided between the cross chamber 11 and the upper heat exchange chamber 13 and the lower heat exchange chamber 14. A through hole 18 is provided between the upper heat exchange chamber 13 and the lower heat exchange chamber 14. A lifting window 19 is provided between the upper heat exchange chamber 13 and the upper heat medium chamber 15, and between the lower heat exchange chamber 14 and the lower heat medium chamber 16. Two groups of Z-shaped heat exchange tube groups are provided inside the heat exchange box 1. The Z-shaped heat exchange tube group includes a plurality of inclined tubes 2 distributed in a linear array. The middle of the inclined tube 2 is rotatably installed in the cross cavity 11. The inclined tubes 2 of the two groups of Z-shaped heat exchange tube groups are cross-distributed. Both ends of the inclined tube 2 are provided with a hinged head 21. The two groups of hinged heads 21 are hinged with a horizontal tube 22. The horizontal tube 22 is connected to the inclined tube 2 through a connecting hose 23. A guide plate 26 is provided on the outside of the horizontal tube 22. The guide plate 26 can block the guide hole 17. A telescopic tube 24 is provided on the end of the horizontal tube 22 away from the inclined tube 2. The lifting window 19 is slidably connected to the lifting window plate 25 on the side away from the cross cavity 11. The telescopic tube 24 is fixedly installed on the lifting window plate 25.

[0023] Full-channel use: At this time, the guide plate 26 is away from the guide hole 17, and the guide plate 26 and the guide hole 17 are staggered. The inclination angle of the two groups of inclined tubes 2 is the smallest, that is, the slope is the smallest. The upper heat exchange chamber 13 and the lower heat exchange chamber 14 on both sides are connected to the cross chamber 11. At this time, the heat medium enters through the upper heat medium chamber 15 on the left, enters the upper horizontal tube 22 through the telescopic tube 24, and then enters the inclined tube 2. Finally, it is discharged into the lower heat medium chamber 16 on the right through the lower horizontal tube 22 and the telescopic tube 24, and flows out through the lower heat medium chamber 16, forming a Z-shaped flow route. Similarly, the heat medium enters the upper heat medium chamber 15 on the right and flows out from the lower heat medium chamber 16 on the left. The Z-shaped flow route not only makes the flow path of the fluid in the heat exchange tube become tortuous, but also increases the turbulence of the fluid. The turbulence will promote faster heat transfer from the fluid to the tube wall, and the height difference between the inlet and outlet can reduce pressure loss, thereby reducing pressure loss caused by heat exchange. Desalted water enters through the lower heat exchange chambers 14 on either side, first coming into contact with the horizontal tubes 22 below for heat exchange, then enters the cross chamber 11 and rises along the cross chamber 11 to exchange heat with the intersecting inclined tubes 2. It then enters the upper heat exchange chamber 13 through the guide holes 17. At this point, the guide plates 26 act as a barrier to the desalted water, allowing it to more evenly fill the upper heat exchange chamber 13. After heat exchange, the desalted water is discharged through the upper heat exchange chamber 13, resulting in an X-shaped flow path through the heat exchange tube bank, fully absorbing heat and achieving high heat exchange efficiency. It should be noted that the heat medium entering the upper heat medium chambers 15 on both sides can be different, allowing two heat sources to be utilized simultaneously.

[0024] Semi-channel use: control one group of inclined tubes 2 to swing so that the inclination angle of the inclined tube 2 reaches the maximum. Due to the swing of the inclined tube 2, the horizontal tube 22 swings, and the horizontal tube 22 always remains horizontal under the action of the telescopic tube 24 and the lifting window plate 25. Therefore, the horizontal tube 22 will move horizontally toward the cross chamber 11 while also rising and falling vertically. Therefore, the horizontal tube 22 can drive the guide plate 26 that was originally misaligned with the guide hole 17 to just block the guide hole 17. For example, the guide holes 17 on the upper heat exchange chamber 13 on the left and the lower heat exchange chamber 14 on the right are blocked. At this time, the desalted water enters through the lower heat exchange chamber 14 on the left, then enters the cross chamber 11, and rises along the cross chamber 11, and then enters the upper heat exchange chamber 13 on the right through the guide hole 17, so that the desalted water flows through the heat exchange tube group in a Z-shaped route, which can fully absorb the heat of a single group of heat exchange tube groups. At this time, the inside of the heat exchange tube group where the inclined tube 2 swings to the maximum angle can be flushed, and the outer tube of the horizontal tube 22 can also be flushed at the same time, so that cleaning can be achieved without stopping the machine.

[0025] Three-channel use: simultaneously control the swing of the two groups of inclined tubes 2 to maximize the inclination angle of the two groups of inclined tubes 2, block all the guide holes 17, and open the through hole 18 at the same time. The upper heat exchange chamber 13 and the lower heat exchange chamber 14 on the same side are connected. At this time, the upper heat exchange chamber 13 and the lower heat exchange chamber 14 on the left form a channel, the cross chamber 11 forms a channel, and the upper heat exchange chamber 13 and the lower heat exchange chamber 14 on the right form a channel. Three different cold media can be exchanged, and the channels on both sides can also be used. The cross chamber 11 is flushed to clean the outer surface of the inclined tube 2.

[0026] The present invention can realize different heat exchange adjustments according to different working conditions, and the heat exchange adjustment in each state can achieve uniform heat exchange. When the inclined tube 2 is not swung to the maximum inclination angle, the flow rate of the heat medium can also be adjusted. During the heat exchange process, pressure stabilization control can be achieved, which can eliminate the influence of unstable heat medium water pressure on heat exchange.

[0027] Embodiment 2, based on the above embodiment, further includes that the top end of the oblique tube 2 is connected in series through a connecting shaft, the inner wall of the cross cavity 11 is provided with an arc-shaped guide opening 12, the center of the arc-shaped guide opening 12 and the rotation center of the oblique tube 2 are on the same axis, and the connecting shaft can slide along the arc-shaped guide opening 12.

[0028] Furthermore, two sets of telescopic cylinders 4 are fixedly installed on the top of the heat exchange box 1, and a driving rod 5 is fixedly installed on the telescopic end of the telescopic cylinder 4. A vertical guide groove is opened inside the driving rod 5, and a sealing arc plate 27 is fixedly installed on one end of the connecting shaft passing through the arc guide port 12. The sealing arc plate 27 is slidably sealed with the arc guide port 12, and a transmission guide column 28 is provided on the outside of the sealing arc plate 27, and the transmission guide column 28 is inserted into the vertical guide groove.

[0029] By controlling the extension of the telescopic cylinder 4, the telescopic cylinder 4 drives the driving rod 5 to move toward the middle of the cross cavity 11, and the driving rod 5 drives the connecting shaft to slide along the arc-shaped guide opening 12 through the transmission guide column 28, and the transmission guide column 28 will rise along the vertical guide groove, and the connecting shaft drives the top end of the inclined tube 2 to swing upward, thereby making the inclination angle of the inclined tube 2 reach the maximum, and under the action of the blocking arc plate 27, the arc-shaped guide opening 12 always remains sealed, and no leakage will occur. The swing control of multiple inclined tubes 2 of the same heat exchange tube group can be achieved at one time, and the control is simple.

[0030] Embodiment 3, based on the above embodiment, further includes that the top and bottom of the cross cavity 11, the top of the upper heat exchange cavity 13, the bottom of the lower heat exchange cavity 14, the outer sides of the upper heat medium cavity 15 and the lower heat medium cavity 16 are all provided with connecting pipe openings.

[0031] Furthermore, a connecting flange is provided on the connecting pipe mouth.

[0032] The design of the connecting pipe port makes it easy to connect with external pipelines.

[0033] Embodiment 4, based on the above embodiment, further includes that a valve plate assembly 3 is provided at the inner bottom of the upper heat exchange chamber 13 and the inner top of the lower heat exchange chamber 14, and the valve plate assembly 3 is composed of a valve plate 31 and a connecting swing plate 32. The valve plate 31 is slidably connected to the inner bottom of the upper heat exchange chamber 13, and a valve hole 33 corresponding to the through hole 18 is opened inside the valve plate 31. The two ends of the connecting swing plate 32 are flexibly connected to the valve plate 31 and the horizontal pipe 22 respectively.

[0034] Furthermore, the flexible connection uses a copper sheet.

[0035] Furthermore, the valve hole 33 and the through hole 18 are both rectangular strips, and after being connected, the flow rate is greater.

[0036] By controlling the extension of the telescopic cylinder 4, the telescopic cylinder 4 drives the driving rod 5 to move toward the middle of the cross cavity 11, and the driving rod 5 drives the connecting shaft to slide along the arc-shaped guide opening 12 through the transmission guide column 28, and the transmission guide column 28 will rise along the vertical guide groove, and the connecting shaft drives the top end of the inclined tube 2 to swing upward, thereby making the inclination angle of the inclined tube 2 reach the maximum. As the inclined tube 2 swings, the horizontal tube 22 swings, and the horizontal tube 22 always remains horizontal under the action of the telescopic tube 24 and the lifting window plate 25. Therefore, while the horizontal tube 22 moves horizontally toward the cross cavity 11, it will also rise and fall vertically. Therefore, the horizontal tube 22 can drive the guide plate 26 that was originally misaligned with the guide hole 17. The guide hole 17 is just blocked. At this time, the horizontal tube 22 located in the upper heat exchange chamber 13 rises, and the horizontal tube 22 drives the connecting swing plate 32 to rise. The connecting swing plate 32 drives the valve plate 31 to approach the cross chamber 11, so that the valve hole 33 that was originally misaligned with the through hole 18 moves to correspond to the through hole 18. However, the through hole 18 is still blocked by the valve plate 31 in the lower heat exchange chamber 14 at this time. Therefore, during semi-channel heat exchange, the upper heat exchange chamber 13 and the lower heat exchange chamber 14 on the same side are not connected. Only when the two groups of inclined tubes 2 swing to the maximum angle at the same time, the upper and lower valve holes 33 both correspond to the through hole 18, and the upper heat exchange chamber 13 and the lower heat exchange chamber 14 are connected, so that three-channel heat exchange can be carried out.

[0037] Embodiment 5, based on the above embodiment, further includes that the guide plate 26 and both ends of the guide hole 17 are designed to be semicircular, the semicircular radius of the guide hole 17 is the same as the outer diameter of the horizontal tube 22, and the semicircular radius of the guide plate 26 is larger than the outer diameter of the horizontal tube 22.

[0038] This design enables the horizontal pipe 22 to be stably raised and lowered in the guide hole 17 , making the adjustment of the horizontal pipe 22 more stable.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A preheating facility for desalted water in a power plant, comprising a heat exchange box (1), characterized in that: A cross chamber (11) is provided in the middle of the heat exchange box (1), and an upper heat exchange chamber (13) and a lower heat exchange chamber (14) are provided on both sides of the cross chamber (11), and an upper heat medium chamber (15) is provided on the side of the upper heat exchange chamber (13) away from the cross chamber (11), and a lower heat medium chamber (16) is provided on the side of the lower heat exchange chamber (14) away from the cross chamber (11). A guide hole (17) is provided between the cross chamber (11) and the upper heat exchange chamber (13) and the lower heat exchange chamber (14), and a through hole (18) is provided between the upper heat exchange chamber (13) and the lower heat exchange chamber (14). A lifting window (19) is provided between the upper heat exchange chamber (13) and the upper heat medium chamber (15), and between the lower heat exchange chamber (14) and the lower heat medium chamber (16). Two groups of Z-shaped heat exchange tube groups are provided inside the heat exchange box (1). The Z-shaped heat exchange tube group includes a plurality of inclined tubes (2) distributed in a linear array. The middle of the inclined tube (2) is rotatably installed in the cross cavity (11). The inclined tubes (2) of the two groups of Z-shaped heat exchange tube groups are cross-distributed. Both ends of the inclined tube (2) are provided with hinged joints (21). Both groups of hinged joints (21) are hinged with horizontal tubes (22). The horizontal tubes (22) are connected to the inclined tubes (2) through connecting hoses (23). A guide plate (26) is provided on the outside of the horizontal tube (22). The guide plate (26) can block the guide hole (17). A telescopic tube (24) is provided at one end of the horizontal tube (22) away from the inclined tube (2). A lifting window plate (25) is slidably connected to the lifting window plate (25) on the side of the lifting window (19) away from the cross cavity (11). The telescopic tube (24) is fixedly installed on the lifting window plate (25).

2. The desalted water preheating facility for a power plant according to claim 1, characterized in that: The top ends of the inclined tubes (2) are connected in series via a connecting shaft. An arc-shaped guide opening (12) is provided on the inner wall of the cross cavity (11). The center of the arc-shaped guide opening (12) and the rotation center of the inclined tube (2) are on the same axis, and the connecting shaft can slide along the arc-shaped guide opening (12).

3. The desalted water preheating facility for a power plant according to claim 2, characterized in that: Two sets of telescopic cylinders (4) are fixedly installed on the top of the heat exchange box (1), and a driving rod (5) is fixedly installed on the telescopic end of the telescopic cylinder (4). A vertical guide groove is provided inside the driving rod (5). One end of the connecting shaft passing through the arc-shaped guide opening (12) is fixedly installed with a blocking arc plate (27). The blocking arc plate (27) and the arc-shaped guide opening (12) are slidably sealed. A transmission guide column (28) is provided on the outside of the blocking arc plate (27), and the transmission guide column (28) is inserted into the vertical guide groove.

4. The desalted water preheating facility for a power plant according to claim 1, characterized in that: The top and bottom of the cross cavity (11), the top of the upper heat exchange cavity (13), the bottom of the lower heat exchange cavity (14), the outer sides of the upper heat medium cavity (15) and the lower heat medium cavity (16) are all provided with connecting pipe openings.

5. The desalted water preheating facility for a power plant according to claim 4, characterized in that: The connecting pipe mouth is provided with a connecting flange.

6. The desalted water preheating facility for a power plant according to claim 1, characterized in that: The inner bottom of the upper heat exchange chamber (13) and the inner top of the lower heat exchange chamber (14) are both provided with a valve plate assembly (3), the valve plate assembly (3) consisting of a valve plate (31) and a connecting swing plate (32), the valve plate (31) being slidably connected to the inner bottom of the upper heat exchange chamber (13), the valve hole (33) corresponding to the through hole (18) being opened inside the valve plate (31), and the two ends of the connecting swing plate (32) being flexibly connected to the valve plate (31) and the horizontal pipe (22) respectively.

7. The desalted water preheating facility for a power plant according to claim 6, characterized in that: The flexible connection adopts copper sheet.

8. The desalted water preheating facility for a power plant according to claim 7, characterized in that: The valve hole (33) and the through hole (18) are both rectangular strips.

9. The desalted water preheating facility for a power plant according to claim 1, characterized in that: Both ends of the guide plate (26) and the guide hole (17) are designed to be semicircular. The semicircular radius of the guide hole (17) is the same as the outer diameter of the horizontal tube (22), and the semicircular radius of the guide plate (26) is larger than the outer diameter of the horizontal tube (22).

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