Vacuum plate heat exchanger structure and heat exchange system suitable for thermal power generating unit

Abstract

This invention belongs to the field of phase change heat exchange technology and discloses a vacuum plate heat exchange structure and a heat exchange system suitable for thermal power units. The structure includes a vacuum plate heat exchange structure with a flue for receiving flue gas generated by a thermal power plant; heat exchange components including a support frame and multiple vacuum corrugated plate heat exchange modules, which are fixedly connected to the flue through the support frame, with the flue gas flowing parallel to the modules. The modules are connected to an external main water collection pipeline; an anti-wear structure is installed on the windward side of the modules to reduce wear from the flue gas; and a sealing structure is installed on the modules to prevent flue gas bypass. This invention completely solves the problems of rapid wear, easy bypass, and short lifespan of traditional circular tube heat pipes, offering significant advantages such as zero wear, high efficiency, low resistance, long lifespan, and easy maintenance.

Description

Technical Field

[0001] This invention belongs to the field of phase change heat exchange technology, and particularly relates to a vacuum plate heat exchange structure and a heat exchange system suitable for thermal power units. Background Technology

[0002] The flue gas at the tail end of a thermal power plant boiler contains a large amount of waste heat. Recovering this heat is an important means to improve the overall energy efficiency of the power plant and reduce coal consumption. Currently, common flue gas waste heat recovery devices include traditional heat pipe heat exchangers, circular tube economizers, and rotary flue gas heat exchangers. Among them, although circular tube heat pipe modules can be arranged inside the flue, they have the following inherent drawbacks in practical engineering applications: 1. Significant wear problem: The circular pipe has an impact angle against the wind. Dust particles in the flue gas directly impact the windward side of the circular pipe under high-speed flow conditions, causing the pipe wall to wear, thin, and leak rapidly. The typical service life is only 3-5 years, which seriously affects the reliability of the system.

[0003] 2. Difficulty in sealing and serious bypass: The gap between the round tube bundle is large, making it difficult to achieve effective sealing between the module and the inner wall of the flue, and between modules. Flue gas can easily bypass through the gap, reducing heat exchange efficiency.

[0004] 3. Low volume utilization and large material consumption: The circular tube bundles are loosely arranged, resulting in a small heat exchange area per unit volume, a large amount of metal materials, a high system weight, and high requirements for the support structure.

[0005] 4. Numerous vacuum points and high risk of leakage: Traditional heat pipes are individually sealed, with dozens or even hundreds of heat pipes in a module. Each heat pipe is a vacuum point, making it difficult to control the reliability of the seal and the maintenance cost.

[0006] 5. Low standardization: Existing technologies cannot form a matching and standardized system solution with large-size and numerous thermal power unit flues, resulting in high design, manufacturing, installation and operation and maintenance costs.

[0007] Therefore, there is an urgent need for a vacuum plate heat exchanger structure and a heat exchange system structure suitable for thermal power units to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a vacuum plate heat exchange structure and a heat exchange system suitable for thermal power units, so as to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides a vacuum plate heat exchange structure, comprising: a flue for receiving flue gas generated by a thermal power plant; a heat exchange assembly including a support frame and multiple vacuum corrugated plate heat exchange modules, wherein the vacuum corrugated plate heat exchange modules are fixedly connected to the flue through the support frame, and the flue gas in the flue flows parallel to the vacuum corrugated plate heat exchange modules, and the multiple vacuum corrugated plate heat exchange modules are connected to and connected to an external main water collection pipeline; an anti-wear structure installed on the windward side of the vacuum corrugated plate heat exchange modules to reduce the wear of the vacuum corrugated plate heat exchange modules by the flue gas; and a sealing structure disposed on the vacuum corrugated plate heat exchange modules to prevent flue gas bypass.

[0010] Preferably, the vacuum corrugated plate heat exchange module includes a corrugated heat exchange plate, a vacuum chamber is provided inside the corrugated heat exchange plate, an outer sleeve is connected to the corrugated heat exchange plate, adjacent outer sleeves are connected by a pipe, a cooling water inlet is provided on one side of the outer sleeve, a cooling water outlet is provided on the other side of the outer sleeve, and a phase change working fluid is stored in the vacuum chamber of the corrugated heat exchange plate.

[0011] Preferably, a condenser tube is provided inside the outer tube, the condenser tube is connected to the corrugated heat exchange plate, and a cooling water jacket is provided between the condenser tube and the outer tube.

[0012] Preferably, the wear-resistant structure includes a wear-resistant plate with a width of H1 and the vacuum corrugated plate heat exchange module with a width of H2, satisfying H1 > H2.

[0013] Preferably, the thickness of the wear-resistant plate is ≥30mm.

[0014] Preferably, the sealing structure includes a metal elastic sealing sheet or a high-temperature resistant fiber sealing gasket.

[0015] Preferably, the phase change working fluid is deionized water or an ethanol-water mixture, the working fluid charge is 15%-25% of the internal volume of the corrugated heat exchange plate, and the internal absolute pressure of the corrugated heat exchange plate is 0.01-0.05 MPa.

[0016] Preferably, the corrugated heat exchange plate is formed by double-plate welding followed by pressurized bulging, and the cross-section of the corrugated heat exchange plate is corrugated.

[0017] A heat exchange system suitable for thermal power units includes multiple vacuum plate heat exchange structures, the number of which is configured according to the capacity of the thermal power unit.

[0018] Preferably, a 200MW thermal power unit is configured with ≥2 of the flues, a 600MW thermal power unit is configured with 4 of the flues, and a 1000MW thermal power unit is configured with 6 of the flues.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects: This invention provides a vacuum plate heat exchange structure and a heat exchange system suitable for thermal power units. By setting vacuum corrugated plate heat exchange modules and making the flue gas flow parallel to the module surface, the windward impact angle of traditional circular tube structures is completely eliminated, fundamentally reducing the impact and wear of fly ash on the heat exchange surface. A support frame ensures reliable fixation and arrangement of the modules within the flue. An anti-wear structure further protects the windward side, and a sealed structure prevents flue gas bypass, ensuring that all flue gas undergoes efficient heat exchange through the internal flow channels of the modules. Multiple modules are connected in parallel to the main water collection pipeline, facilitating system integration and flow distribution. This structure lays the foundation for subsequent long-life, high-efficiency, and low-resistance flue gas waste heat recovery. This invention completely solves the problems of rapid wear, easy bypass, and short lifespan of traditional circular tube heat pipes, offering outstanding advantages such as zero wear, high efficiency, low resistance, long lifespan, and easy maintenance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall front structure of the vacuum plate heat exchanger structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the overall side structure of the vacuum plate heat exchanger structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the vacuum corrugated plate heat exchange module structure of the present invention.

[0024] Figure 4 This is a schematic diagram showing the flow direction of flue gas and cooling water in this invention.

[0025] Figure 5 This is a schematic diagram of the flue gas flow inside the vacuum plate heat exchanger structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the wear-resistant plate structure of the present invention.

[0027] Figure 7 This is a schematic diagram of the plate heat exchange structure of the present invention subjected to flue gas impact.

[0028] Figure 8 This is a schematic diagram of a tubular heat exchanger structure subjected to flue gas impact in existing technology.

[0029] Figure 9 This is a schematic diagram of the heat exchange system structure of the present invention.

[0030] The components are: 1. Flue; 2. Support frame; 3. Vacuum corrugated plate heat exchange module; 31. Corrugated heat exchange plate; 32. Outer jacket; 33. Cooling water inlet; 34. Cooling water outlet; 35. Phase change working fluid; 36. Condenser tube; 37. Cooling water jacket; 4. Wear-resistant plate; 5. Sealing structure. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1-9 This invention provides a vacuum plate heat exchange structure, comprising: a flue 1 for receiving flue gas generated by a thermal power plant; a heat exchange assembly including a support frame 2 and multiple vacuum corrugated plate heat exchange modules 3, wherein the vacuum corrugated plate heat exchange modules 3 are fixedly connected to the flue 1 through the support frame 2, and the flue gas in the flue 1 flows parallel to the vacuum corrugated plate heat exchange modules 3, and the multiple vacuum corrugated plate heat exchange modules 3 are connected to and connected to an external main water collection pipeline; an anti-wear structure installed on the windward side of the vacuum corrugated plate heat exchange modules 3 to reduce the wear of the vacuum corrugated plate heat exchange modules 3 by the flue gas; and a sealing structure 5 disposed on the vacuum corrugated plate heat exchange modules 3 to prevent flue gas bypass.

[0034] In one embodiment of the present invention, by setting up a vacuum corrugated plate heat exchange module 3 and making the flue gas flow parallel to the module surface, the windward impact angle in the traditional circular tube structure is completely eliminated, fundamentally reducing the impact and wear of fly ash on the heat exchange surface. The support frame 2 ensures reliable fixation and arrangement of the modules within the flue duct 1. The wear-resistant structure further protects the windward side, and the sealing structure 5 prevents flue gas bypass, ensuring that all flue gas undergoes efficient heat exchange through the internal flow channels of the module. Multiple modules are connected in parallel to the main water collection pipeline, facilitating system integration and flow distribution. This structure lays the structural foundation for subsequent realization of long-life (≥10 years), high-efficiency, and low-resistance flue gas waste heat recovery.

[0035] As an optional implementation, the vacuum corrugated plate heat exchange module 3 includes a corrugated heat exchange plate 31, a vacuum chamber is provided inside the corrugated heat exchange plate 31, an outer sleeve 32 is connected to the corrugated heat exchange plate 31, and adjacent outer sleeves 32 are connected by a pipe. A cooling water inlet 33 is provided on one side of the outer sleeve 32, and a cooling water outlet 34 is provided on the other side of the outer sleeve 32. A phase change working fluid 35 is stored in the vacuum chamber of the corrugated heat exchange plate 31.

[0036] In one embodiment of the present invention, the corrugated heat exchange plate 31 has a vacuum chamber filled with a phase change working fluid 35, achieving efficient heat transfer using the vacuum phase change principle: flue gas heats the working fluid to vaporize it, the vapor rises to the outer casing area where it is condensed and releases heat by cooling water, and the condensate flows back, forming a natural circulation. Adjacent outer casings 32 are connected by pipes, and cooling water flows from the inlet to the outlet, achieving continuous heat exchange. Compared with circular tube heat pipes, this structure integrates the dispersed tube-vacuum system into a plate-vacuum system, reducing sealing points by more than 90% and greatly reducing the risk of leakage. The corrugated plate structure expands the heat exchange area, enhances the heat transfer coefficient, and is also lighter and consumes less metal.

[0037] As an optional implementation, a condenser tube 36 is provided inside the outer tube 32, the condenser tube 36 is connected to the corrugated heat exchange plate 31, and a cooling water jacket 37 is provided between the condenser tube 36 and the outer tube 32.

[0038] In one embodiment of the present invention, the structure achieves one-cavity-one-tube interconnection, with each corrugated heat exchange plate 31's vacuum cavity independently connected to a condenser tube 36, and a cooling water jacket 37 disposed outside the condenser tube 36. The condenser tube 36 and the cooling water jacket 37 form a sleeve-type condensation structure, with cooling water flowing within the jacket, and working fluid vapor condensing and releasing heat on the inner wall of the condenser tube 36, resulting in high heat transfer efficiency and a compact structure. Simultaneously, each vacuum cavity is independent, and leakage in one module does not affect other modules, significantly improving system reliability. The cooling water jacket 37 is designed for easy parallel water collection, has a simple manufacturing process, and is convenient to maintain.

[0039] As an optional implementation, the wear-resistant structure includes a wear-resistant plate 4 with a width of H1 and a vacuum corrugated plate heat exchange module 3 with a width of H2, satisfying H1 > H2.

[0040] In one embodiment of the present invention, by setting an anti-wear plate 4 with a width greater than the module width, it is ensured that the anti-wear plate 4 completely covers the heat exchange plate and its weld seams or edge areas on both sides on the windward side, so that fly ash particles in the flue gas impact the anti-wear plate 4 first rather than the heat exchange plate. Even if the anti-wear plate 4 wears down after long-term operation, the heat exchange plate remains intact, achieving the design goal of zero wear on the heat exchange plate. The dimensional relationship of H1 > H2 ensures that the anti-wear plate 4 provides full coverage protection for the heat exchange area, eliminating the leakage risk caused by edge wear in traditional structures.

[0041] As an optional implementation, the thickness of the abrasion plate 4 is ≥30mm.

[0042] In one embodiment of the present invention, based on a typical coal-fired unit flue gas dust concentration of 20-40 g / m³, flue gas velocity of 10-15 m / s, and an annual wear rate of 2-3 mm for the wear-resistant steel material of the wear-resistant plate 4, a thickness ≥30 mm can ensure a service life of more than 10 years. The wear-resistant plate 4, as a sacrificial protective component, can be replaced separately after wear, while the vacuum corrugated plate heat exchange module body does not need to be replaced, significantly reducing the total life-cycle maintenance cost.

[0043] As an optional implementation, the sealing structure 5 includes a metal elastic sealing sheet or a high-temperature resistant fiber sealing gasket.

[0044] In one embodiment of the present invention, the metal elastic sealing sheet has excellent high-temperature resistance (≥400℃) and elastic compensation capability, which can adapt to the expansion difference between the module and the inner wall of the flue under thermal conditions and maintain sealing pressure for a long time. The high-temperature resistant fiber sealing gasket (such as ceramic fiber, expanded graphite) has both sealing and heat insulation functions and is easy to install. Both methods can achieve full circumferential sealing between the module and the inner wall of the flue, and between modules. Flue gas can only pass through the corrugated flow channel inside the module, eliminating bypass and ensuring 100% flue gas participation in heat exchange. The heat exchange efficiency is significantly higher than that of traditional circular tube bundle systems.

[0045] As an optional implementation, the phase change working fluid 35 is deionized water or an ethanol-water mixture, the working fluid charge is 15%-25% of the internal volume of the corrugated heat exchange plate 31, and the internal absolute pressure of the corrugated heat exchange plate 31 is 0.01-0.05 MPa.

[0046] In one embodiment of the present invention, deionized water has the advantages of high latent heat of vaporization, non-toxicity, non-corrosiveness, and low cost, making it suitable for conventional flue gas temperatures (120-160℃). The ethanol-water mixture can adjust the phase change temperature, adapting to a wider range of operating conditions. A charge volume of 15%-25% ensures sufficient working fluid circulation while avoiding excessive charge that could increase liquid resistance. An absolute pressure of 0.01-0.05 MPa corresponds to a working fluid boiling point of approximately 45-85℃, ensuring rapid vaporization and heat exchange initiation under flue gas heating conditions, while reducing the stringent requirements for vacuum sealing. This parameter range was determined through optimization experiments to achieve optimal heat transfer performance and start-up characteristics.

[0047] As an optional implementation, the corrugated heat exchange plate 31 is formed by double-plate welding followed by pressurized bulging, and the cross section of the corrugated heat exchange plate 31 is corrugated.

[0048] In one embodiment of the invention, after the perimeters of the double plates are welded, the plates are inflated using internal hydraulic or pneumatic pressure to form corrugated flow channels. This process requires no molds, is low-cost, and produces uniform molding. The corrugated cross-section significantly increases the heat exchange area (1.5 to 2 times higher than that of a flat plate), while also enhancing the structural rigidity and resistance to external pressure of the plates. The corrugated flow channels guide the flue gas to generate localized disturbances, enhancing convective heat transfer with limited increase in resistance.

[0049] A heat exchange system suitable for thermal power units includes multiple vacuum plate heat exchange structures, and the number of flues 1 is configured according to the capacity of the thermal power unit.

[0050] In one embodiment of the present invention, by combining multiple independent flues 1 and their internal modules into a system, and flexibly configuring the number of flues according to the unit capacity, the upgrade from a single product to a systematic solution is realized. Different capacity units require different amounts of waste heat recovery and different heat exchange areas. The total heat exchange capacity can be linearly adjusted by increasing or decreasing the number of flues without redesigning the modules. The system has high standardization and scalability, and significantly reduces design, manufacturing and installation costs.

[0051] As an optional implementation, a 200MW thermal power unit is configured with ≥2 flues1, a 600MW thermal power unit is configured with 4 flues1, and a 1000MW thermal power unit is configured with 6 flues1.

[0052] In one embodiment of the present invention, the flue gas volume of a 200MW unit is approximately 600,000 Nm³ / h, and two flues can achieve a full-section modular arrangement, with the total heat exchange capacity meeting design requirements. Furthermore, 50% of the heat exchange capacity remains even during maintenance of a single flue. For a 600MW unit, the flue gas volume is approximately 1.8 million Nm³ / h, and four flues are symmetrically arranged, resulting in a uniform flue gas flow field. Maintenance of a single flue results in only a 25% loss of heat exchange capacity, without affecting the unit's load capacity. For a 1000MW unit, the flue gas volume is approximately 3 million Nm³ / h, and six flues further reduce the heat load on a single flue, increasing system redundancy. Even during maintenance of any single flue, the system can still maintain over 83% of its heat exchange capacity.

[0053] In one embodiment of the present invention, a single flue 1 of a 600MW unit is taken as an example. The cross-sectional dimensions of flue 1 are 3.5m × 2.2m. A vacuum corrugated plate heat exchange module 3 is fabricated: a double-plate weld of 1.5mm thick 304 stainless steel is used, and after perimeter sealing welding, it is formed by hydraulic expansion at 1.0MPa, with a corrugation height of 6mm, forming a vacuum chamber. The vacuum chamber is filled with deionized water at 20% capacity, and then evacuated to an absolute pressure of 0.03MPa before sealing. A sleeve structure is formed by condenser tubes 36 and outer sleeves 32, with cooling water jackets 37 spaced 5mm apart. The wear-resistant plate 4 is made of NM500 wear-resistant steel, with a width H1 = 230mm, a module width H2 = 200mm, and a thickness of 32mm. The sealing structure 5 uses a high-temperature resistant ceramic fiber gasket. The module is fixed inside the flue by a support frame, with the modules arranged closely together laterally and longitudinally, and the gasket compacted. The cooling water inlets and outlets of multiple modules are connected in parallel to a DN200 main water pipe. After the system was put into operation, the flue gas flowed parallel to the corrugated plate, the wear plate 4 was subjected to fly ash impact, the heat exchange plate was unworn, the system resistance was 260Pa, after 2 years of continuous operation, the wear of the wear plate 4 was about 4.2mm, the heat exchange plate was intact, and the vacuum degree remained stable.

[0054] In one embodiment of the present invention, the system configuration of units with different capacities is as follows: 200MW unit: Equipped with 2 independent flues, each flue has 12 sets of vacuum corrugated plate heat exchange modules, with wear-resistant plates 4 and a thickness of 30mm, and a total heat exchange of about 5.2MW, which can reduce the exhaust temperature by about 25℃.

[0055] 600MW unit: Equipped with 4 independent flues, each flue has 16 modules, wear-resistant plates with a thickness of 32mm, total heat exchange of about 10.4MW, reducing coal consumption by about 1.8g / kWh.

[0056] 1000MW unit: Equipped with 6 independent flues, each flue has 20 modules, wear-resistant plates with a thickness of 35mm, total heat exchange of about 19.5MW, saving about 6,000 tons of standard coal per year.

[0057] This invention completely eliminates the windward impact angle through a full-coverage anti-wear plate design and parallel flue gas flow, achieving zero wear on the heat exchange plates and a system lifespan of ≥10 years. The fully circumferential sealed structure eliminates flue gas bypass, ensuring 100% of the flue gas participates in heat exchange through the heat exchange modules, resulting in significantly higher heat exchange efficiency than traditional circular tube heat pipe systems. Flue gas flows parallel to the corrugated plate surface, without flow around or eddies, reducing system resistance by approximately 30%-40% compared to traditional circular tube heat pipe systems. The independent modular design allows for quick disassembly and replacement, and individual flue ducts can be independently inspected without affecting the overall system operation. The corrugated plate structure has high specific strength, with metal consumption per unit heat exchange area only 50-60% of that of circular tube bundles. The overall plate-type vacuum structure minimizes vacuum sealing points, significantly reducing the risk of leakage. The number of flue ducts is standardized according to unit capacity, suitable for 200MW, 600MW, and 1000MW thermal power units.

[0058] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vacuum plate heat exchanger structure, characterized by, include: Flue (1) is used to receive flue gas generated by thermal power plants; The heat exchange assembly includes a support frame (2) and multiple vacuum corrugated plate heat exchange modules (3). The vacuum corrugated plate heat exchange modules (3) are fixedly connected to the flue (1) through the support frame (2), and the flue gas in the flue (1) flows parallel to the vacuum corrugated plate heat exchange modules (3). The multiple vacuum corrugated plate heat exchange modules (3) are connected to and connected to an external main water collection pipeline. The wear-resistant structure is installed on the windward side of the vacuum corrugated plate heat exchange module (3) to reduce the wear of the vacuum corrugated plate heat exchange module (3) by the flue gas. A sealing structure (5) is provided on the vacuum corrugated plate heat exchange module (3) to prevent flue gas bypass.

2. A vacuum panel heat exchanger structure according to claim 1, characterized in that: The vacuum corrugated plate heat exchange module (3) includes a corrugated heat exchange plate (31), a vacuum chamber is provided inside the corrugated heat exchange plate (31), an outer tube (32) is connected to the corrugated heat exchange plate (31), and two adjacent outer tubes (32) are connected by a pipe. A cooling water inlet (33) is provided on one side of the outer tube (32), and a cooling water outlet (34) is provided on the other side of the outer tube (32). A phase change working fluid (35) is stored in the vacuum chamber of the corrugated heat exchange plate (31).

3. A vacuum plate heat exchanger according to claim 2, characterized in that: A condenser tube (36) is provided inside the outer tube (32). The condenser tube (36) is connected to the corrugated heat exchange plate (31). A cooling water jacket (37) is provided between the condenser tube (36) and the outer tube (32).

4. A vacuum panel heat exchanger structure according to claim 1, characterized in that: The wear-resistant structure includes a wear-resistant plate (4), the width of the wear-resistant plate (4) is H1, and the width of the vacuum corrugated plate heat exchange module (3) is H2, satisfying H1 > H2.

5. A vacuum panel heat exchanger structure according to claim 4, characterized in that: The thickness of the wear-resistant plate (4) is ≥30mm.

6. A vacuum panel heat exchanger structure according to claim 1, characterized in that: The sealing structure (5) includes a metal elastic sealing sheet or a high-temperature resistant fiber sealing gasket.

7. A vacuum panel heat exchanger structure according to claim 2, characterized in that: The phase change working fluid (35) is deionized water or ethanol-water mixture, and the working fluid charge is 15%-25% of the internal volume of the corrugated heat exchange plate (31). The absolute pressure inside the corrugated heat exchange plate (31) is 0.01-0.05 MPa.

8. A vacuum panel heat exchanger structure according to claim 2, characterized in that: The corrugated heat exchange plate (31) is formed by double-plate welding followed by pressurized bulging, and the cross section of the corrugated heat exchange plate (31) is corrugated.

9. A heat exchange system suitable for a thermal power unit, comprising a plurality of the vacuum plate heat exchange structures according to claim 1, characterized in that: The number of flues (1) is configured according to the capacity of the thermal power unit.

10. The heat exchange system for a thermal power unit according to claim 9, characterized in that: A 200MW thermal power unit is equipped with ≥2 of the aforementioned flues (1), a 600MW thermal power unit is equipped with 4 of the aforementioned flues (1), and a 1000MW thermal power unit is equipped with 6 of the aforementioned flues (1).

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