Large high-reliability plate heat exchanger

Abstract

The invention provides a large high-reliability plate heat exchanger which comprises a plate sheet, a fixed pressing plate, a movable pressing plate, an upper guide beam and a lower guide beam, the plate sheet is located between the fixed pressing plate and the movable pressing plate, and the upper end and the lower end of the movable pressing plate and the upper end and the lower end of the plate sheet are connected with the upper guide beam and the lower guide beam in a sliding mode respectively. A stress optimization mechanism is arranged on the upper guide beam and used for optimizing stress distribution of the upper guide beam, the stress optimization mechanism comprises a supporting reinforcing part, and the supporting reinforcing part is arranged in the extending direction of the upper guide beam. According to the large high-reliability plate heat exchanger, the problem of deformation of suspension related parts is fundamentally solved, and the pressure bearing capacity and the overall reliability of a suspension structure are greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of plate heat exchangers, and in particular to a large-scale high-reliability plate heat exchanger. Background Art

[0002] Plate heat exchangers have the advantages of high heat transfer coefficient, large logarithmic mean temperature difference, small footprint, easy to change heat exchange area or process combination, light weight, low price, easy to make, easy to clean, small heat loss, and not easy to scale. Therefore, they are widely used in refrigeration, HVAC, chemical industry, machinery industry, electric power industry, petroleum, medicine, seawater desalination and shipbuilding.

[0003] The research, design and manufacturing of plate heat exchangers in my country began in the late 1960s. The conventional plate heat exchanger suspension structure is an I-beam, with a fixed mounting plate welded to the front end, and the I-beam is fixed to the fixed clamping plate and the pillar. The conventional plate heat exchanger has a small installation area per unit, and the total number of installed plates is small. The upper guide beam needs to bear the weight of the movable clamping plate, plates, sealing gaskets, roller racks and other parts and the weight of the operating medium. The overall weight is small, and the above structure can be used to achieve reliable installation.

[0004] However, large plate heat exchangers have large weights for single plates and sealing gaskets, a large number of plates installed in a single unit, and heavy tonnage of movable clamping plates. If the above structure is adopted, the upper guide beam will not only bear the weight of components and media, but also the shear stress caused by its own gravity after installation. It is easy to deform, resulting in problems such as uneven plate assembly, leakage, and failure of water pressure test. In order to ensure the performance of the plate heat exchanger suspension structure in high reliability design, especially when there are a large number of plates and a large total weight, how to prevent the suspension part from deformation and maintain the pressure bearing capacity and overall reliability during long-term operation has become a key issue that needs to be solved urgently.

[0005] Chinese patent CN111609739B discloses a large plate heat exchanger with large temperature difference and small end difference. In this invention, the right end face of the guide part is located on the left side of the right end face of the support part, and the right end of the support part is fixedly connected to the upper end face of the bracket. The reinforced upper guide beam can ensure that the equipment can hang the plate with the maximum installed area and always ensure safe interference and load bearing. Although this invention strengthens the upper guide beam, it cannot solve the problem of pressure bearing capacity and reliability of the plate heat exchanger from a structural point of view.

[0006] The present invention sets a stress optimization mechanism for the upper guide beam, and comprehensively designs multiple components, further providing an overall solution, so that the problem of deformation of suspension-related components is fundamentally solved, the pressure-bearing capacity and overall reliability of the suspension structure are greatly improved, and it is particularly suitable for large plate heat exchangers. Summary of the invention

[0007] In view of this, the present invention aims to provide a large-scale highly reliable plate heat exchanger, fundamentally solving the problem of deformation of the hanging related components, and greatly improving the pressure-bearing capacity and overall reliability of the hanging structure.

[0008] To achieve the above object, the technical solution of the present invention is realized as follows:

[0009] A large-scale highly reliable plate heat exchanger includes plate sheets, a fixed pressing plate, a movable pressing plate (3), an upper guide beam, and a lower guide beam. The plate sheets are located between the fixed pressing plate and the movable pressing plate. The upper and lower ends of the movable pressing plate and the plate sheets are respectively slidably connected to the upper guide beam and the lower guide beam. A stress optimization mechanism is provided for the upper guide beam to optimize the stress distribution of the upper guide beam. The stress optimization mechanism includes a support reinforcement member, and the support reinforcement member is arranged along the extending direction of the upper guide beam. The stress optimization mechanism enables the stress of the entire system to be reasonably distributed, thereby solving the stress concentration problem caused by load imbalance.

[0010] Further, the support reinforcement member at least includes one of a front support reinforcement member and a rear support reinforcement member; the front support reinforcement member is arranged at the front part of the upper guide beam, and the rear support reinforcement member is arranged at the rear part of the upper guide beam. This setting can adjust the moment distribution, balance the load, optimize the stress distribution of the upper guide beam, and improve the safety and stability of the structure.

[0011] Further, the stress optimization mechanism further includes an end face reinforcement member, and the end face reinforcement member at least includes one of a front end face reinforcement member and a rear end face reinforcement member; the front end face reinforcement member is arranged at the front end face of the upper guide beam, and the rear end face reinforcement member is arranged at the rear end face of the upper guide beam. This setting can effectively change the shear stress distribution at the end of the structure, thereby improving the overall strength and stability of the structure.

[0012] Further, the rear support reinforcement member is located between the upper guide beam and the support column, and the upper guide beam is fixedly connected to the top of the support column through the rear support reinforcement member. This setting enables the rear support reinforcement member to have both a connection function and a structure strengthening function, and makes the structure compact and the installation convenient.

[0013] Further, the front support reinforcement member is located above the front end face reinforcement member and the upper guide beam, and covers the top of the fixed pressing plate. This setting can balance the load, optimize the internal stress distribution at the front end of the upper guide beam, and improve the safety, stability and reliability of the structure.

[0014] Further, the front end face reinforcement member is located between the upper guide beam and the fixed pressing plate, and the upper guide beam is fixedly connected to the top of the fixed pressing plate through the front end face reinforcement member. This setting enables the front end face reinforcement member to have both a connection function and a stress optimization function, and makes the structure compact and the installation convenient.

[0015] Furthermore, the upper guide beam and the inverted T-shaped slide rail are integrally designed and processed from I-beams. The hanging area of the lower plate of the I-beam is processed into an inverted T-shaped slide rail to meet the hanging requirements of the plates. The original shape of the I-beam is retained in the rear end area of the upper guide beam, which is fixedly connected to the rear support reinforcement to ensure the structural strength.

[0016] Furthermore, lower guide beam reinforcements are provided along the length direction of the lower guide beam to enhance the strength of the lower guide beam.

[0017] Furthermore, reinforcement plates are provided at the movable connection openings at the upper ends of the plates to enhance the strength of the plate hanging points.

[0018] Furthermore, fixed anchor mounting holes are provided at positions near the two corners at the lower part of the movable pressing plate for fixedly connecting the movable pressing plate and the fixed anchor. This setting supports the movable pressing plate, avoids the upper guide beam from bearing the weight of the movable pressing plate during the long-term operation of the plate heat exchanger, prevents the upper guide beam from being deformed due to long-term stress, and improves the stability and reliability of the long-term operation of the plate heat exchanger.

[0019] Compared with the prior art, the large high-reliability plate heat exchanger of the present invention has the following advantages:

[0020] 1. A stress optimization mechanism is provided for the upper guide beam to optimize the stress distribution of the upper guide beam and improve the safety and reliability of the upper guide beam.

[0021] 2. Through the comprehensive design of multiple components, an overall solution is given, fundamentally solving the problem of deformation of the suspension-related components, and greatly improving the pressure-bearing capacity and overall reliability of the suspension structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic structural diagram of the large high-reliability plate heat exchanger according to Embodiment 1 of the present invention;

[0024] Figure 2 is a schematic diagram of the positional relationship between the lower guide beam and the stress optimization mechanism of the large high-reliability plate heat exchanger according to Embodiment 1 of the present invention;

[0025] Figure 3 is a schematic diagram of the positional relationship between the lower guide beam, the fixed pressing plate and the support columns of the large high-reliability plate heat exchanger according to Embodiment 1 of the present invention;

[0026] Figure 4Structural schematic diagram of the movable pressing plate of the large-scale highly reliable plate heat exchanger described in Embodiment 1 of the present invention;

[0027] Figure 5 Structural schematic diagram of the fixed pressing plate of the large-scale highly reliable plate heat exchanger described in Embodiment 1 of the present invention;

[0028] Figure 6 Structural schematic diagram of the lower guide beam of the large-scale highly reliable plate heat exchanger described in Embodiment 1 of the present invention;

[0029] Figure 7 Schematic diagram of the assembly relationship between the lower guide beam and the plate of the large-scale highly reliable plate heat exchanger described in Embodiment 1 of the present invention;

[0030] Figure 8 Schematic diagram of the assembly relationship between the upper guide beam and the plate of the large-scale highly reliable plate heat exchanger described in Embodiment 1 of the present invention;

[0031] Explanation of reference numerals:

[0032] 1, plate; 2, fixed pressing plate; 3, movable pressing plate; 4, upper guide beam; 5, lower guide beam; 6, support column; 7, fixed floor; 8, roller frame combination; 10, reinforcing plate; 31, fixed floor mounting hole; 41, front-end face reinforcing member; 42, front support reinforcing member; 43, rear support reinforcing member; 44, rear-end face reinforcing member; 50, lower guide beam reinforcing member; 51, first plug of the lower guide beam; 52, second plug of the lower guide beam. Detailed implementation manners

[0033] In order to make the technical means, objectives and effects of the present invention easy to understand, the embodiments of the present invention will be described in detail below with reference to specific drawings.

[0034] It should be noted that all the terms indicating directions and positions in the present invention, such as: "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "top", "bottom", "lateral", "longitudinal", "center", etc., are only used to explain the relative positional relationship and connection situation between components in a specific state (as shown in the drawings), and are only for the convenience of describing the present invention, rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0037] Example 1

[0038] like Figure 1 As shown, a large-scale high-reliability plate heat exchanger includes a plate 1, a fixed pressing plate 2, a movable pressing plate 3, an upper guide beam 4, a lower guide beam 5, and a support 6. The plate 1 is located between the fixed pressing plate 2 and the movable pressing plate 3, and the upper and lower ends of the movable pressing plate 3 and the plate 1 are slidingly connected to the upper guide beam 4 and the lower guide beam 5 respectively. A stress optimization mechanism is provided at the end of the upper guide beam 4 for optimizing the stress distribution of the upper guide beam 4.

[0039] Stress distribution optimization refers to making the stress state in a structure or mechanical component more uniform and reasonable through design, material selection, manufacturing process, etc. Its purpose is to ensure that when bearing load, the stress can be more evenly distributed throughout the structure, thereby avoiding material damage or failure caused by excessive local stress. By optimizing stress distribution, not only can the safety and performance of the structure be improved, but also the cost can be effectively reduced and the service life can be extended.

[0040] The stress optimization mechanism makes the stress of the whole system reasonably distributed, thus solving the stress concentration problem caused by load imbalance. Load imbalance will cause certain parts of the structure to bear excessive stress, forming stress concentration areas. Under high stress for a long time, the material is prone to micro cracks, which will cause fatigue damage and deformation. If the local stress is too large, the fatigue life of the structural parts will be significantly shortened, increasing maintenance costs and replacement frequency.

[0041] The stress optimization mechanism includes at least one of the end face reinforcement and the support reinforcement. In terms of material selection, materials with strength and stiffness matching or stronger than those of the upper guide beam 4 should be chosen to ensure the overall performance after connection. For dynamic loads or repeated loading conditions, the fatigue performance of the end face reinforcement should also be considered to ensure its long-term reliability. In terms of welding process, appropriate welding processes such as TIG welding, MIG welding, etc. should be adopted to ensure welding quality and avoid welding defects.

[0042] The end face reinforcement is located at both end faces of the upper guide beam 4, which can effectively change the shear stress distribution at the end of the structure, thereby improving the overall strength and stability of the structure. Welding can be used for connection. This setting can improve the local stiffness and make it more difficult for this area to deform. At the same time, by reasonably designing the shape and size of the end face reinforcement, the stress concentration phenomenon can be effectively reduced, avoiding structural failure caused by excessive local stress. The geometric shape of the end face reinforcement should be optimized according to the surface shape of the upper guide beam 4, and it can be circular, square or other special shapes.

[0043] The end face reinforcement includes at least one of the front end face reinforcement 41 and the rear end face reinforcement 44. As Figure 2 shown, the front end face reinforcement 41 is arranged at the front end face of the upper guide beam 4, optimizing the front end stress distribution. The rear end face reinforcement 44 is arranged at the rear end face of the upper guide beam 4, optimizing the rear end stress distribution.

[0044] Preferably, the front end face reinforcement 41 is located between the upper guide beam 4 and the fixed pressing plate 2, and the upper guide beam 4 is fixedly connected to the top of the fixed pressing plate 2 through the front end face reinforcement 41. This setting enables the front end face reinforcement 41 to have both connection function and stress optimization function, and makes the structure compact and convenient for installation.

[0045] The support reinforcement is located at both ends of the upper guide beam 4 and is arranged along the extension direction of the upper guide beam 4, and includes at least one of the front support reinforcement 42 and the rear support reinforcement 43. The front support reinforcement 42 is arranged at the front part of the upper guide beam 4, and the rear support reinforcement 43 is arranged at the rear part of the upper guide beam 4.

[0046] The front support reinforcement 42 is located above the front end face reinforcement 41 and the upper guide beam 4, and presses on the top of the fixed pressing plate 2. Since the plates 1 are usually concentrated and suspended at the front part of the upper guide beam 4, stress concentration is more likely to occur at the front part of the upper guide beam 4 compared to other parts. On the one hand, the front support reinforcement 42 is arranged at the front part of the upper guide beam 4, which can adjust the moment distribution in this area, balance the load, and optimize the internal stress distribution at the front end of the upper guide beam 4. For the mechanical system composed of the upper guide beam 4 and the fixed pressing plate 2, the addition of the front support reinforcement 42 and the front end face reinforcement 41 changes the mechanical structure at the front end of the upper guide beam 4. By adding the front support reinforcement 42 near the fulcrum, the system moment distribution is optimized, and the safety and stability of the structure are improved. At the same time, the front support reinforcement 42 fixedly connects the front end face reinforcement 41 and the upper guide beam 4, further enhancing the ability of the upper guide beam 4 to withstand shear stress. On the other hand, the front support reinforcement 42 is located above the front end face reinforcement 41 and the upper guide beam 4, and presses on the top of the fixed pressing plate 2, which can share the load applied to the upper guide beam 4, reduce the shear stress of the connecting device between the front end face reinforcement 41 and the fixed pressing plate 2, and improve the reliability of the connection.

[0047] The rear support reinforcement 43 is located between the upper guide beam 4 and the support column 6, and the upper guide beam 4 is fixedly connected to the top of the support column 6 through the rear support reinforcement 43. This setting enables the rear support reinforcement 43 to have both a connecting function and a structural strengthening function. The rear support reinforcement 43 is located between the top surface of the support column 6 and the lower side surface of the upper guide beam 4, so that the upper guide beam 4 is placed on the support column 6 after the frame is assembled. This setting reduces the shear stress caused by installation at the rear end of the upper guide beam 4 and enhances the stability of the structure.

[0048] The installation positions and shapes of the front end face reinforcement 41 and the front support reinforcement 42 can be adjusted according to the specific requirements of the model. Preferably, the top of the front end face reinforcement 41 is flush with the upper edge of the upper guide beam 4, the rear part of the front support reinforcement 42 is fixedly connected to the top of the front end face reinforcement 41, the rear part of the front support reinforcement 42 is fixedly connected to the position near the front side of the upper edge of the upper guide beam 4, and the front end of the front support reinforcement 42 protrudes forward beyond the front end face reinforcement 41; the rear part of the front support reinforcement 42, the top of the front end face reinforcement 41, and the front part of the upper guide beam 4 are closely and fixedly connected together to achieve the optimal stress structure. Preferably, the front end of the front support reinforcement 42 extends to be flush with the outside of the fixed pressing plate 2.

[0049] The installation positions and shapes of the rear end face reinforcement 44 and the rear support reinforcement 43 can be adjusted according to the specific requirements of the model. Preferably, the top of the rear end face reinforcement 44 is flush with the upper edge of the upper guide beam 4, and the bottom of the rear end face reinforcement 44 is flush with the bottom surface of the rear support reinforcement 43. The rear end face reinforcement 44 fixedly connects the rear support reinforcement 43 and the upper guide beam 4 into one body, changes the shear stress distribution near the rear end face of the upper guide beam 4, and improves the local stiffness and strength.

[0050] During the assembly and later operation of the plate heat exchanger, the two ends of the above upper guide beam 4 are provided to avoid phenomena such as bending deformation of the upper guide beam 4 and uneven assembly of the plate 1.

[0051] Preferably, the upper guide beam 4 is made of square steel or I-beam with sufficient strength. Taking the P350 plate heat exchanger as an example, the number of installed plates 1 is 602, and 28# I-beam is used.

[0052] Taking the P350 plate heat exchanger as an example, a rectangular plate-shaped steel is used as the front-end surface reinforcement 41, and a thickened rectangular plate-shaped steel is used as the front support reinforcement 42. As Figure 2 shown, a space for embedding the front-end surface reinforcement 41 is cut out at the front part of the I-beam upper guide beam 4, and the front-end surface reinforcement 41 is embedded. The plate surface of the front-end surface reinforcement 41 is fixedly connected to the front cross-section of the I-beam by full welding, and the front-end surface reinforcement 41 is perpendicular to the inverted T-shaped slide rail. This setting strengthens the structure near the front-end surface of the upper guide beam 4, and the T-shaped slide rail under the front-end surface reinforcement 41 can still be used normally. The upper edge of the front-end surface reinforcement 41 is flush with the upper surface of the upper guide beam 4, which is convenient for welding the front support reinforcement 42 to the upper edge of the front-end surface reinforcement 41 and the upper surface of the upper guide beam 4 into a whole. The front-end surface reinforcement 41 is positioned and fixed to the fixed pressing plate 2 through a connecting piece.

[0053] Taking the P350 plate heat exchanger as an example, both the rear support reinforcement 43 and the rear-end surface reinforcement 44 are made of rectangular plate-shaped steel. The plate surface of the rear-end surface reinforcement 44 is fixedly connected to the rear end surface of the I-beam by full welding. The top end of the rear-end surface reinforcement 44 is flush with the upper edge of the upper guide beam 4, and the bottom end of the rear-end surface reinforcement 44 is flush with the bottom surface of the rear support reinforcement 43. The rear support reinforcement 43 adds a support structure to the rear part of the upper guide beam 4, improving the structural strength of the rear part; the rear-end surface reinforcement 44 fixedly connects the rear support reinforcement 43 and the upper guide beam 4 into one body, changing the shear stress distribution near the structural end surface and enhancing the local stiffness and strength.

[0054] As Figure 2 shown, the upper guide beam 4 and the inverted T-shaped slide rail are integrally designed and processed from I-beam. According to the opening size and shape of the hanging of the plate 1, the lower horizontal structure of the I-beam is cut and polished into the shape required for the inverted T-shaped slide rail for directly hanging the plate 1. The integral design of the upper guide beam 4 and the inverted T-shaped slide rail has higher overall strength because there are no welds or other connection points, reducing stress concentration and potential fracture points.

[0055] Preferably, the front and middle parts of the upper guide beam 4 are the suspension areas of the plate 1. The lower part of the I-beam is processed into an inverted T-shaped slide rail to meet the suspension requirements of the plate 1. The rear end area of the upper guide beam 4 retains the original shape of the I-beam, ensuring the structural strength and facilitating the welding with the rear support reinforcement 43. The suspension area and the rear end area are connected by a gradually changing transition section to ensure the continuity and stability of the structure.

[0056] The lower guide beam reinforcement 50 is arranged along the length direction on the lower guide beam 5, and the cross-section of the lower guide beam reinforcement 50 is square. This setting has both functions of enhancing the load-bearing strength and installation positioning.

[0057] Preferably, as Figure 6 shown, the lower guide beam 5 is made of 100*100 square steel, and the lower guide beam reinforcement 50 is made of 40*40 square steel. The 40*40 square steel is placed at the center position on the upper side of the 100*100 square steel and is fully welded by argon arc welding. After welding, the whole is straightened; this improves the load-bearing strength of the lower guide beam 5 and can ensure the accurate positioning after the plate 1 is suspended, thus effectively improving the qualified rate of the assembly of the plate heat exchanger and the operation reliability.

[0058] A reinforcing piece 10 is arranged at the movable connection opening at the upper end of the plate 1, and the reinforcing piece 10 is fixedly attached to the surface of the plate 1.

[0059] Preferably, the reinforcing piece 10 is welded at the suspension position on one side of each plate 1, effectively improving the strength of the plate suspension position. The assembly positioning structure of the plate 1, as Figure 7 and Figure 8 shown, realizes the suspension positioning of the plate 1 through five-point positioning, effectively preventing problems such as the deformation of the upper guide beam 4 and the leakage of the installed machine caused by the dislocation of the plate 1 during the suspension of the plate.

[0060] Preferably, using a bolt hydraulic pre-tightener to pre-tighten the plate 1 can ensure that the pre-tightening force is uniform, consistent, and controllable, and it can visually ensure that the assembly stops at the optimal clamping size through the pressure change, greatly improving the assembly efficiency and the operation reliability of the plate heat exchanger after assembly. Taking the P350 plate heat exchanger as an example, hydraulic pressure tests of 2.1MPa / 3.25MPa / 3.9MPa are respectively qualified, which can meet the design pressure requirements of plate heat exchangers for supporting various industries such as heating ventilation, chemical engineering, and shipbuilding.

[0061] Fixed floor mounting holes 31 are arranged at the positions close to the two corners at the lower part of the movable pressing plate 3 for fixedly connecting the movable pressing plate 3 and the fixed floor 7. Preferably, taking the P350 plate heat exchanger as an example, the weight of the movable pressing plate is about 3t, as Figure 4As shown in the figure, fixed floor mounting holes 31 are provided at positions near the two corners at the lower part of the movable pressing plate 3. After the assembly of the plate heat exchanger is completed, the fixed floor 7 is installed through these holes to support the movable pressing plate, sharing the weight from the movable pressing plate for the upper guide beam 4, avoiding long-term fatigue deformation of the upper guide beam 4 due to force, and improving the stability and reliability of the long-term operation of the plate heat exchanger.

[0062] The design strength of the upper guide beam 4 should meet the requirement of being greater than 1.5 times of all the loads it bears. The loads that the upper guide beam 4 is designed to bear should consider: the loads of the upper guide beam 4, the movable pressing plate 3, the intermediate partition, the maximum number of lower plates 1, and the weight of the filled medium water or other fluids with a larger density, etc. This setting is for the design of the safety factor, which can significantly improve the safety of the structure, reduce the risk of failure, and cope with uncertainties; at the same time, the higher design strength can effectively slow down the fatigue damage, thereby extending the service life of the structure or equipment and improving the reliability and economy.

[0063] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A large-scale high-reliability plate heat exchanger, comprising a plate (1), a fixed pressing plate (2), a movable pressing plate (3), an upper guide beam (4), and a lower guide beam (5), wherein the plate (1) is located between the fixed pressing plate (2) and the movable pressing plate (3), and the upper and lower ends of the movable pressing plate (3) and the plate (1) are slidably connected to the upper guide beam (4) and the lower guide beam (5), respectively, and characterized in that: A stress optimization mechanism is provided on the upper guide beam (4) for optimizing the stress distribution of the upper guide beam (4); the stress optimization mechanism comprises a support reinforcement member, and the support reinforcement member is provided along the extension direction of the upper guide beam (4).

2. The large-scale high-reliability plate heat exchanger according to claim 1 is characterized in that: The support reinforcement member comprises at least one of a front support reinforcement member (42) and a rear support reinforcement member (43); the front support reinforcement member (42) is arranged at the front part of the upper guide beam (4), and the rear support reinforcement member (43) is arranged at the rear part of the upper guide beam (4).

3. The large-scale high-reliability partial heat exchanger according to claim 2 is characterized in that: The stress optimization mechanism further comprises an end face reinforcement member, the end face reinforcement member comprising at least one of a front end face reinforcement member (41) and a rear end face reinforcement member (44); the front end face reinforcement member (41) is arranged at the front end face of the upper guide beam (4), and the rear end face reinforcement member (44) is arranged at the rear end face of the upper guide beam (4).

4. The large-scale high-reliability heat exchanger according to claim 2 is characterized in that: The rear support reinforcement member (43) is located between the upper guide beam (4) and the pillar (6), and the upper guide beam (4) is fixedly connected to the top end of the pillar (6) via the rear support reinforcement member (43).

5. The large-scale high-reliability heat exchanger according to claim 3 is characterized in that: The front support reinforcement member (42) is located above the front end face reinforcement member (41) and the upper guide beam (4), and covers the top end of the fixed clamping plate (2).

6. The large-scale high-reliability plate heat exchanger according to claim 3 is characterized in that: The front end face reinforcement member (41) is located between the upper guide beam (4) and the fixed pressing plate (2), and the front end face reinforcement member (41) is fixedly connected to the fixed pressing plate (2).

7. The large-scale high-reliability plate heat exchanger according to claim 2, characterized in that: The upper guide beam (4) and the inverted T-shaped slide rail are of an integrated design and are processed from an I-beam; the lower plate suspension area of ​​the I-beam is processed into an inverted T-shaped slide rail; the rear end area of ​​the upper guide beam (4) retains the original shape of the I-beam and is fixedly connected to the rear support reinforcement (43).

8. The large-scale high-reliability plate heat exchanger according to claim 1, characterized in that: The lower guide beam (5) is provided with a lower guide beam reinforcement member (50) along the length direction, so as to enhance the strength of the lower guide beam (5).

9. The large-scale high-reliability plate heat exchanger according to claim 1, characterized in that: A reinforcing sheet (10) is provided at the movable connection opening at the upper end of the plate (1) to enhance the strength of the hanging portion of the plate (1).

10. The large-scale high-reliability plate heat exchanger according to claim 1, characterized in that: Fixed foot mounting holes (31) are provided at the lower portion of the movable clamping plate (3) near two corners, and are used to fixedly connect the movable clamping plate (3) and the fixed foot (7).

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