Heat exchanger

Abstract

The present application provides a heat exchanger comprising: a frame; the core plate bundle is arranged in the frame and comprises a plurality of stacked heat exchange plates, a heat exchange flow channel is formed between every two adjacent heat exchange plates, and the heat exchange flow channels form at least one heat exchange process in the core plate bundle; the tube box assembly is arranged outside the core body plate bundle and communicates with a port of the heat exchange runner; the grid plate assembly is arranged in the tube box assembly, is located at a port inlet of the heat exchange process and comprises at least two grid plates which are arranged at intervals in the extending direction of the heat exchange process, each grid plate comprises a plurality of plate sheets which are stacked and arranged at intervals, and the stacking directions of the plate sheets of every two adjacent grid plates are staggered; and the plate sheet stacking direction of the grid plate close to the port inlet of the heat exchange flow is perpendicular to the stacking direction of the heat exchange plates of the core body plate bundle. The heat exchanger is simple in structure, convenient to manufacture, good in fluid distribution effect and long in service life, and the abrasion and blockage phenomena are greatly improved.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchanger. Background Art

[0002] Heat exchangers are devices that transfer part of the heat of hot fluids to cold fluids. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. In the application field of alumina, due to the intermediate cooling production process of supersaturated alumina solution, a large number of high-hardness alumina particles continuously agglomerate, decompose and grow in grains during the temperature reduction process, which causes the heat exchangers used in this process to suffer from abrasion, scaling, clogging and failure. For single-pass or multi-pass heat exchangers, at the inlet of each process, it is inevitable that biased flow and a large range of flow rate variations will occur, especially at the inlet after the second process, where abrasion and clogging problems are more serious. Therefore, there is an urgent need for a heat exchanger that can improve the abrasion phenomenon. Summary of the invention

[0003] In view of this, the purpose of the present application is to propose a heat exchanger to solve the related problems mentioned in the background technology.

[0004] Based on the above-mentioned purpose, the present application provides a heat exchanger, comprising: a frame; a core plate bundle, arranged in the frame, comprising a plurality of stacked heat exchange plates, a heat exchange channel is formed between adjacent heat exchange plates, and the heat exchange channel forms at least one heat exchange process in the core plate bundle; a pipe box assembly, arranged outside the core plate bundle and connected to the port of the heat exchange channel; a grid plate assembly, arranged in the pipe box assembly, located at the port inlet of the heat exchange process, comprising at least two grid plates arranged at intervals along the extension direction of the heat exchange process, each of the grid plates comprising a plurality of plates stacked and arranged at intervals, and the plate stacking directions of two adjacent grid plates are staggered; in the grid plate assembly, the grid plate close to the port inlet of the heat exchange process is the first grid plate, and the remaining grid plates are the second grid plates, and the plate stacking direction of the first grid plate is perpendicular to the stacking direction of the heat exchange plates of the core plate bundle.

[0005] Furthermore, the thickness of the plate is 6 mm to 15 mm, the spacing between the plates is 0.3 times to 2.0 times the spacing between the heat exchange channels, and the length of the plate along the extension direction of the heat exchange flow path is 50 mm to 200 mm.

[0006] Furthermore, the heat exchange flow channel includes a cold side flow channel and a hot side flow channel, the hot side flow channel forms at least one hot side process in the core plate bundle, the pipe box assembly includes a cold side pipe box and a hot side pipe box, and the grid plate assembly is arranged in the hot side pipe box and is located at the port inlet of each hot side process.

[0007] Furthermore, the plate spacing of the first grid plate is greater than or equal to the plate spacing of the second grid plate, the spacing between the first grid plate and the core plate bundle is greater than or equal to the spacing between the second grid plate and the first grid plate, or the spacing between the second grid plate and the first grid plate is equal to the spacing between two adjacent second grid plates.

[0008] Furthermore, a distance between the first grid plate and the core plate bundle is 200 mm to 400 mm, and a distance between the second grid plate and the first grid plate is 100 mm to 200 mm.

[0009] Furthermore, the heat exchange flow channel forms a multi-pass heat exchange process, a baffle is provided in the pipe box assembly, each group of the grid plate assemblies includes a first grid plate and a second grid plate arranged perpendicular to each other, and at least one group of the grid plate assemblies is arranged close to the baffle.

[0010] Further, in the grid plate assembly close to the baffle, the plate spacing in at least a portion of the area close to the baffle is greater than the plate spacing in at least a portion of the area away from the baffle.

[0011] Further, in the grid plate assembly close to the baffle, the second grid plate includes a first plate group and a second plate group stacked along the stacking direction of the heat exchange plate, the first plate group is arranged close to the baffle, and the plate spacing of the first plate group is greater than the plate spacing of the second plate group.

[0012] Furthermore, the plate spacing of the second plate group is greater than or equal to the spacing of the heat exchange flow channels, the plate spacing of the first plate group is less than or equal to 1.5 times the plate spacing of the second plate group, and the plate stacking thickness of the first plate group is 1 / 4 to 1 / 3 of the plate stacking thickness of the second grid plate.

[0013] Further, in the grid plate assembly close to the baffle, the plate spacing of the first grid plate is greater than or equal to the plate spacing of the second plate group; or, in the grid plate assembly close to the baffle, the first grid plate includes a third plate group and a fourth plate group stacked along the stacking direction of the heat exchange plate, a partition parallel to the baffle is provided between the third plate group and the fourth plate group, the third plate group is arranged close to the baffle, and the plate spacing of the third plate group is greater than the plate spacing of the fourth plate group.

[0014] As can be seen from the above, the heat exchanger provided in the present application includes: a frame; a core plate bundle, which is arranged in the frame and includes a plurality of stacked heat exchange plates, and a heat exchange channel is formed between adjacent heat exchange plates, and the heat exchange channel forms at least one heat exchange process in the core plate bundle; a pipe box assembly, which is arranged outside the core plate bundle and is connected to the port of the heat exchange channel; a grid plate assembly, which is arranged in the pipe box assembly and is located at the port inlet of the heat exchange process, including at least two grid plates arranged at intervals along the extension direction of the heat exchange process, each grid plate includes a plurality of plates stacked and arranged at intervals, and the plate stacking directions of two adjacent grid plates are staggered; in the grid plate assembly, the grid plate close to the port inlet of the heat exchange process is the first grid plate, and the remaining grid plates are the second grid plates, and the plate stacking direction of the first grid plate is perpendicular to the stacking direction of the heat exchange plates of the core plate bundle. By setting staggered grid plates at the port inlet of the heat exchange process, the uneven distribution of high-solid fluid entering the heat exchanger core plate bundle can be solved, thereby improving the abrasion, scaling and clogging of the heat exchanger core plate bundle, while ensuring the high heat transfer performance of the heat exchanger during operation, especially for the second pass and later heat exchange process port inlet fluid distribution improvement is more significant, the overall can extend the cleaning cycle of the heat exchanger and improve the service life. The heat exchanger has a simple structure, is easy to make, has a good fluid distribution effect, greatly improves the abrasion and clogging phenomenon, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of a three-dimensional structure of a heat exchanger in an embodiment of the present application; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the heat exchanger; Figure 3It is a side view of the hot side pipe box located at the hot side main inlet in the embodiment of the present application; Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of the medium heat side pipe box along the AA direction; Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of the medium-heat side pipe box along the BB direction; Figure 6 It is a side view of a hot side tube box located at the baffle in an embodiment of the present application; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure of the medium heat side pipe box along the CC direction; Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure of the medium-heat side pipe box along the DD direction; Fig. 9 It is a side view of another hot side tube box located at the baffle in an embodiment of the present application; Fig.10 for Fig. 9 Schematic diagram of the cross-sectional structure of the medium heat side pipe box along the EE direction; Fig.11 for Fig. 9 Schematic diagram of the cross-sectional structure of the medium heat side pipe box along the FF direction.

[0017] Figure numerals: 1. frame; 2. core plate bundle; 3. pipe box assembly; 3-1. cold side pipe box; 3-2. hot side pipe box; 3-3. baffle; 3-4. distributor; 3-5. hot side total inlet; 3-6. hot side total outlet; 4. grid plate assembly; 4-1. first grid plate; 4-2. second grid plate; 4-3. first plate group; 4-4. second plate group; 4-5. third plate group; 4-6. fourth plate group; 4-7. partition. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0019] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Heat exchangers are devices that transfer part of the heat of hot fluids to cold fluids. Heat exchangers play an important role in chemical, petroleum, power, food and many other industrial productions. In the application field of alumina, due to the intermediate cooling production process of supersaturated alumina solution, a large number of high-hardness alumina particles continuously agglomerate, decompose and grow in grains during the temperature reduction process, which causes the heat exchangers used in this process to suffer from abrasion, scaling, clogging and failure. For single-pass or multi-pass heat exchangers, at the inlet of each process, it is inevitable that biased flow and a large range of flow rate variations will occur, especially at the inlet after the second process, where abrasion and clogging problems are more serious. Therefore, there is an urgent need for a heat exchanger that can improve the abrasion phenomenon.

[0021] For a one-way heat exchanger, at the inlet of the heat exchanger, due to factors such as installation space limitations, pipe elbow layout, and filter blockage, bias flow and a large flow rate variation range are inevitable at the inlet of the heat exchanger. Excessive flow rate will cause local abrasion at the inlet pipe box and plate bundle inlet of the heat exchanger. Bias flow and low flow rate will cause the decomposition of sodium aluminate and grain growth in the fluid of the corresponding flow channel, thus causing blockage problems.

[0022] For multi-pass heat exchangers, especially at the inlet of each pass after the second pass of the heat exchanger, the deviation phenomenon is more obvious due to the influence of the size of the pipe box and the fluid deflection: the flow rate in the flow channel close to the baffle is smaller and scarring is prone to occur in the flow channel; the flow rate in the flow channel away from the baffle is larger and its inlet is prone to abrasion. In addition, the deviation flow also affects the heat transfer efficiency of the heat exchanger, making the heat exchange amount of the fluid unable to meet the cooling requirements of the decomposition tank design.

[0023] Some technologies propose to add a porous flow distribution grid plate to the total inlet of the hot side of the heat exchanger, which has a certain effect on improving the uniformity of fluid distribution at the first-pass inlet of the heat exchanger. However, for the multi-pass inlet after the second pass where the flow distribution is more uneven, it is not considered to install a grid plate for flow distribution. Moreover, the distribution is only distributed through the grid plate once, which has limited effect on improving the uniformity of fluid distribution in the flow channel, and the distribution method depends on the change of the hole area at different positions of the grid plate. However, if the hole area is too small, it will significantly increase the resistance of the fluid, causing the consumption of pump work, which is not conducive to energy saving. The small hole jet effect can easily lead to a large flow velocity after the hole, which can easily cause local abrasion at the inlet of the liquid-solid two-phase heat exchanger of the wide channel heat exchanger.

[0024] In some other technologies, an inner and outer two-stage perforated flow guide plate in an eight-shaped shape is set in the semicircular head to solve the problem of uneven fluid distribution at the inlet of the shell and tube heat exchanger. The two-stage flow guide plate has an obvious interval and separation effect, but the flow is still concentrated between the flow guide plates, while in the peripheral area of ​​the circular shell far away from the inlet, the flow is obviously insufficient, the flow rate is too low, and the distribution uniformity is not improved enough. In addition, this orifice plate is not suitable for the liquid-solid two-phase medium working condition of the wide channel heat exchanger, and its jet effect will accelerate the local abrasion phenomenon of the subsequent plate bundle inlet.

[0025] It is necessary to consider solving the problem of uniformity of fluid distribution at the inlet of the heat exchanger, improve abrasion, and alleviate scaling and clogging problems, especially for the inlet area after the second pass of the multi-pass heat exchanger. The fluid distribution problem should be improved without requiring a larger pipe box space and higher manufacturing costs, and the heat transfer performance of the heat exchanger should be further improved, extending the product cleaning cycle and service life.

[0026] Below, through specific embodiments and in combination with the attached Figures 1 to 11 The technical solution of this application is further described in detail.

[0027] In some embodiments of the present application, a heat exchanger is provided, such as Figure 1 and Figure 2As shown, it includes: a frame 1; a core plate bundle 2, which is arranged in the frame 1 and includes a plurality of stacked heat exchange plates, and a heat exchange flow channel is formed between adjacent heat exchange plates, and the heat exchange flow channel forms at least one heat exchange process in the core plate bundle 2; a pipe box assembly 3, which is arranged outside the core plate bundle 2 and is connected to the port of the heat exchange flow channel; a grid plate assembly 4, which is arranged in the pipe box assembly 3 and is located at the port inlet of the heat exchange process, including at least two grid plates arranged at intervals along the extension direction of the heat exchange process, each of the grid plates includes a plurality of plates stacked and arranged at intervals, and the plate stacking directions of two adjacent grid plates are staggered; in the grid plate assembly 4, the grid plate close to the port inlet of the heat exchange process is the first grid plate 4-1, and the remaining grid plates are the second grid plates 4-2, and the plate stacking direction of the first grid plate 4-1 is perpendicular to the stacking direction of the heat exchange plates of the core plate bundle 2.

[0028] like Figure 1 As shown, it is a schematic diagram of the structure of a heat exchanger, and the heat exchanger includes a frame 1, a core plate bundle 2 and a tube box assembly 3. The frame 1 is used to support the heat exchanger. The core plate bundle 2 is arranged in the frame 1, and is used for fluid heat exchange. The core plate bundle 2 is in the shape of a rectangular parallelepiped, and includes a plurality of stacked heat exchange plates. The H direction in the figure is the stacking direction of the heat exchange plates of the core plate bundle 2. Heat exchange channels are formed between adjacent heat exchange plates, and ports of the heat exchange channels are formed in the end areas of the heat exchange plates. The tube box assembly 3 is arranged outside the core plate bundle 2, and its shape is, for example, a semi-cylindrical or rectangular parallelepiped shape. The tube box assembly 3 is connected to the channel port of the core plate bundle 2 to provide space for the fluid to enter and exit and change the flow direction of the fluid. The heat exchange channel forms at least one heat exchange process in the core plate bundle 2, such as Figure 2 As shown, Figure 1 In the cross-sectional view of the heat exchanger, it can be seen that the heat exchange flow channel on the hot side has two heat exchange processes. The L direction in the figure is the extension direction of the heat exchange process, which is also the length direction of the core plate bundle 2. When the heat exchange process is an odd-numbered process, the total hot side inlet 3-5 and the total hot side outlet 3-6 correspond to different pipe box components 3 settings, and when the heat exchange process is an even-numbered process, the total hot side inlet 3-5 and the total hot side outlet 3-6 correspond to the same pipe box component 3 setting.

[0029] A grid plate assembly 4 is provided in the pipe box assembly 3 and is located at the port inlet of the heat exchange process. The grid plate assembly 4 can be specifically provided at a position according to the distribution requirements, for example, only provided at the port inlet after the second heat exchange process, or only provided at the port inlet of the first heat exchange process, or provided at the port inlet of each heat exchange process, etc., without specific limitation. Each group of grid plate assemblies 4 includes at least two grid plates spaced apart along the extension direction of the heat exchange process, and the number of grid plates is, for example, two, three or four, etc., without specific limitation, and can be adjusted according to the distribution effect.

[0030] like Figure 2 As shown, a group of grid plate assemblies 4 are arranged at the port inlet of each heat exchange process. Each group of grid plate assemblies 4 includes two grid plates arranged at intervals along the extension direction of the heat exchange process. The grid plate near the inlet of the heat exchange process in the grid plate assembly 4 is the first grid plate 4-1, and the remaining grid plates are the second grid plates 4-2. Each grid plate includes a plurality of plates stacked and arranged at intervals. Figure 4 and Figure 5 As shown, it is a schematic cross-sectional view of the grid plate assembly 4 at the inlet of the first pass in different directions. The grid plate includes a plurality of plates stacked and arranged at equal intervals in a single direction. The plate surface of a single plate is arranged parallel to the extension direction of the heat exchange process. The flow of the fluid along the grid plate can be redistributed to make the distribution more uniform. Compared with the orifice plate, the grid plate design, on the one hand, because the plate occupies a smaller channel space and has a smaller flow resistance, can ensure the subsequent heat exchange effect. On the other hand, the fluid flows along the plate without forming a jet, the flow rate is more stable, and local abrasion is avoided.

[0031] The stacking directions of the plates of two adjacent grid plates are staggered, that is, the angle between the stacking directions of the plates of two adjacent grid plates is greater than 0° and less than or equal to 90°, for example, the angle is 30°, 45°, 60° or 90°, etc., which is not specifically limited, and can further improve the fluid distribution effect. Figure 5 As shown, the angle between the stacking directions of the two grid plates is 90°. After the fluid enters from the inlet, it first passes through the second grid plate 4-2 for preliminary uniform distribution, and is mixed once in the space between the two grid plates. Then, the distribution direction is changed, and then it enters the first grid plate 4-1 to change the distribution direction and redistribute, thereby making the distribution of the fluid more uniform, avoiding the situation where the fluid is not evenly distributed after only one distribution, forming laminar flow and maintaining the distribution effect to enter the core plate bundle 2, which will still cause abrasion and clogging.

[0032] The plate stacking direction of the first grid plate 4-1 close to the port inlet of the heat exchange process in each grid plate assembly 4 is perpendicular to the heat exchange plate stacking direction of the core plate bundle 2. Figure 2As shown, this can further improve the distribution effect. After the fluid is distributed through the first grid plate 4-1, it is mixed for the second time in the space between the first grid plate 4-1 and the core plate bundle 2, and finally the distribution direction is changed again to enter the core plate bundle 2. Through multiple distribution, mixing, changing direction and redistribution, remixing and changing direction and redistribution, the distribution of the fluid is more uniform, and the distribution dead zone is significantly reduced.

[0033] The grid plate assembly 4 includes at least two grid plates, ensuring that the grid plate assembly 4 performs at least two fluid distributions to ensure the fluid distribution effect. The more grid plates there are in the grid plate assembly 4, the higher the final distribution effect. Generally, two grid plates can achieve a uniform distribution effect, but the severity of the bias flow in different working conditions is different. For working conditions with severe bias flow, more staggered grid plates can be set to improve the fluid distribution effect. However, as the number of grid plates increases, more space is occupied, and a longer pipe box assembly 3 needs to be set, which has a higher manufacturing cost and a greater resistance loss, which is not conducive to energy saving.

[0034] In addition, although the grid plate assembly 4 is arranged at the port inlet of each heat exchange process, the fluid distribution effect at the inlet of each heat exchange process can be improved, the first heat exchange process is connected to the overall inlet of the heat exchange flow channel, such as Figure 2 As shown, there is usually a longer straight pipe section there, so the fluid unevenness or deviation is not obvious, while the deviation is obvious in the heat exchange process after the second stage because the fluid will bend and the flow direction will change. That is to say, the grid plate assembly 4 can better improve the fluid distribution effect at the port inlet of the heat exchange process after the second stage, avoid abrasion at the inlet, and improve the heat exchange effect. From the perspective of cost or occupied space, the grid plate assembly 4 can also be set only at the port inlet of the heat exchange process after the second stage.

[0035] By arranging staggered grid plates at the port inlet of the heat exchange process, the problem of uneven distribution of high-solid fluid entering the heat exchanger core plate bundle 2 can be solved, and the abrasion, scaling and clogging of the heat exchanger core plate bundle 2 can be improved. At the same time, the high heat transfer performance of the heat exchanger during operation is guaranteed, especially for the heat exchange process port inlet fluid distribution after the second pass. The improvement is more significant, which extends the cleaning cycle of the heat exchanger as a whole and improves the service life.

[0036] The heat exchanger has a simple structure, is easy to manufacture, has a good fluid distribution effect, greatly improves abrasion and clogging phenomena, and has a long service life.

[0037] In some embodiments, Figures 3 to 5As shown, the thickness of the plate is 6 mm to 15 mm, the spacing between the plates is 0.3 times to 2.0 times the spacing between the heat exchange channels, and the length of the plate along the extension direction of the heat exchange process is 50 mm to 200 mm.

[0038] like Figure 4 As shown, the thickness T of the plate is 6mm to 15mm, for example, 6mm, 8mm, 10mm, 12mm or 15mm, etc., and there is no specific limitation, which can ensure the structural strength and heat exchange effect. Avoid too thin plates, the grid plate strength is low, the assembly and welding are inconvenient, and the wear-resistant thickness margin is small, the service life is short, and the replacement cycle is short; also avoid too thick plates, which will occupy a large channel space, significantly increase the fluid flow resistance, reduce the heat exchange effect, and increase the manufacturing cost.

[0039] like Figure 2 As shown, the spacing of the heat exchange flow channel is D0, and the spacing of the plates is set to (0.3~2.0) D0, for example, the spacing is 0.3D0, 0.5D0, 1.0D0, 1.5D0 or 2.0D0, etc., without specific limitation, which can ensure the fluid distribution effect and heat exchange effect. Avoid too small spacing, too large flow resistance, reduced heat exchange effect, and increased production cost; also avoid too large spacing, poor fluid distribution effect, and impurities or large particles in the fluid will enter the core plate bundle 2, causing blockage, deflection and abrasion, etc., which is difficult to repair.

[0040] In some embodiments, Figure 2 As shown, the heat exchange flow channel includes a cold side flow channel and a hot side flow channel, the hot side flow channel forms at least one hot side process in the core plate bundle 2, the pipe box assembly 3 includes a cold side pipe box 3-1 and a hot side pipe box 3-2, and the grid plate assembly 4 is arranged in the hot side pipe box 3-2, located at the port inlet of each hot side process.

[0041] The heat exchange flow channel includes a cold side flow channel and a hot side flow channel, which are arranged alternately. Accordingly, the pipe box assembly 3 includes a cold side pipe box 3-1 and a hot side pipe box 3-2. The hot side flow channel forms at least one hot side process in the core plate bundle 2, such as Figure 2 As shown, the hot side flow channel forms a two-pass hot side process in the core plate bundle 2. Because the fluid in the hot side flow channel will usually cool down and crystallize after heat exchange, it is more likely to suffer from serious abrasion, scaling, clogging and failure. The grid plate assembly 4 is set in the hot side pipe box 3-2, located at the port inlet of each hot side process, which can more effectively ensure the heat exchange effect and improve the service life. The fluid in the cold side flow channel usually has fewer impurities, so the grid plate assembly 4 can be omitted to reduce the production cost and reduce the occupied space.

[0042] In some embodiments, Figure 2As shown, the plate spacing of the first grid plate 4-1 is greater than or equal to the plate spacing of the second grid plate 4-2, the spacing between the first grid plate 4-1 and the core plate bundle 2 is greater than or equal to the spacing between the second grid plate 4-2 and the first grid plate 4-1, or the spacing between the second grid plate 4-2 and the first grid plate 4-1 is equal to the spacing between two adjacent second grid plates 4-2.

[0043] like Figure 4 As shown, the plate spacing of the first grid plate 4-1 is D1. Figure 5 As shown, the plate spacing of the second grid plate 4-2 is D2, and D1≥D2 is set, for example, D1≥D0 is set, and D2≤D0, so that the fluid distribution effect can be ensured and the service life of the heat exchanger can be improved. The core plate bundle 2 is usually a thin plate structure, and the heat exchange plate is prone to wear and failure, and is difficult to repair. The plate thickness of the grid plate is much greater than the plate thickness of the heat exchange plate, and the wear margin is large. It is located in the pipe box assembly 3 and is easy to repair and replace. The hot side fluid carries impurities or large particles into the heat exchanger and first passes through the second grid plate 4-2 with a smaller plate spacing, which can block and filter impurities, and prevent impurities from entering the core plate bundle 2 to cause blockage, deflection and abrasion. After that, the fluid enters the first grid plate 4-1 with a larger spacing for fluid distribution. The fluid is evenly distributed and the flow resistance is small, and the heat exchange effect is good, especially when the grid plate assembly 4 is set at the port inlet of the first heat exchange process, the filtering effect is better.

[0044] like Figure 2 As shown, the spacing between the first grid plate 4-1 at the entrance of the first pass and the core plate bundle 2 is L1, the spacing between the first grid plate 4-1 at the entrance of the second pass and the core plate bundle 2 is L3, the spacing between the first grid plate 4-1 at the entrance of the first pass and the second grid plate 4-2 is L2, and the spacing between the first grid plate 4-1 and the second grid plate 4-2 at the entrance of the second pass is L4. The spacing between the first grid plate 4-1 and the core plate bundle 2 is set to be greater than or equal to the spacing between the second grid plate 4-2 and the first grid plate 4-1, that is, L1≥L2, L3≥L4 are set to ensure that the fluid can be fully mixed before entering the core plate bundle 2. L1 can be equal to or unequal to L3, and L2 can be equal to or unequal to L4, and there is no specific limitation, and it can be adjusted according to the degree of fluid distribution at the actual position. In addition, in the case where a group of grid plate assemblies 4 has a plurality of second grid plates 4-2, the distance between two adjacent second grid plates 4-2 may be equal to L2 or L4, which is convenient for design.

[0045] In some embodiments, the spacing between the first grid plate 4 - 1 and the core plate bundle 2 is 200 mm to 400 mm, and the spacing between the second grid plate 4 - 2 and the first grid plate 4 - 1 is 100 mm to 200 mm.

[0046] L1 is set to 200mm to 400mm, for example, L1 is 200mm, 300mm or 400mm, etc., without specific limitation, so that the secondary distributed fluid can be mixed more effectively, avoiding L1 being too large, occupying a large space, and the fluid will be unevenly distributed again due to the influence of particle sedimentation in the fluid; it also avoids L1 being too small, insufficient fluid mixing, excessive impact, and abrasion or scaling blockage on the inlet of the core plate bundle 2.

[0047] L2 is set to 100 mm to 200 mm, for example, L2 is 100 mm, 150 mm or 200 mm, etc., without specific limitation, so that the once distributed fluid can be effectively mixed and redistributed.

[0048] In some embodiments, Figures 3 to 5 As shown, the heat exchange flow channel forms a multi-pass heat exchange process, and at least one baffle 3-3 is provided in the pipe box assembly 3. A group of grid plate assemblies 4 are provided at the port inlet of each heat exchange process after the second pass. The grid plate assembly 4 is arranged close to the baffle 3-3, including the first grid plate 4-1 and the second grid plate 4-2 which are arranged perpendicular to each other.

[0049] like Figure 2 As shown, the heat exchange flow channel forms a two-pass heat exchange process. A baffle 3-3 is provided in the pipe box assembly 3 at the inlet of the second pass, which is used to change the flow direction of the fluid, increase the number of fluid flows in the core plate bundle 2, increase the flow length, and improve the heat exchange effect. In addition, a diverter plate 3-4 is provided in the pipe box assembly 3 at the inlet of the first pass, which is used to isolate the fluid of the first pass and the second pass.

[0050] The grid plate assembly 4 includes a first grid plate 4-1 and a second grid plate 4-2 which are arranged perpendicular to each other. The grid plates which are arranged perpendicular to each other have the best effect on fluid distribution. The two grid plates are arranged to ensure the fluid distribution effect and the space utilization rate. A group of grid plate assemblies 4 are arranged at the port inlet of each heat exchange process after the second pass. The grid plate assembly 4 is arranged close to the baffle 3-3, which can focus on improving the fluid distribution at the port inlet after the second pass to avoid abrasion and clogging.

[0051] In some embodiments, Figures 6 to 8 As shown, in the grid plate assembly 4 near the baffle 3-3, the plate spacing in at least a portion of the area near the baffle 3-3 is greater than the plate spacing in at least a portion of the area away from the baffle 3-3.

[0052] like Figure 8As shown, in the retention area near the baffle 3-3, the fluid flow resistance is large, and a more sparsely arranged plate can be set; in the area far from the baffle 3-3, the fluid flow resistance is small, and a relatively densely arranged plate can be set to make the overall distribution of the fluid more uniform. For the adjustment of the spacing density of the plates, the first grid plate 4-1 and the second grid plate 4-2 can be adjusted at the same time, or only the second grid plate 4-2 can be adjusted, because the second grid plate 4-2 is closer to the position where the flow direction of the fluid changes, and the fluid distribution there is more uneven.

[0053] In some embodiments, Figures 6 to 8 As shown, in the grid plate assembly 4 near the baffle 3-3, the second grid plate 4-2 includes a first plate group 4-3 and a second plate group 4-4 stacked along the stacking direction of the heat exchange plate, the first plate group 4-3 is arranged close to the baffle 3-3, and the plate spacing of the first plate group 4-3 is greater than the plate spacing of the second plate group 4-4.

[0054] like Figure 8 As shown, in the grid plate assembly 4 at the inlet after the second pass, the second grid plate 4-2 includes a first plate group 4-3 and a second plate group 4-4 stacked along the stacking direction of the heat exchange plates, the first plate group 4-3 is arranged close to the baffle plate 3-3, the plate stacking direction of the first plate group 4-3 is the same as the stacking direction of the heat exchange plates, the plate stacking direction of the second plate group 4-4 is also the same as the stacking direction of the heat exchange plates, the plate spacing of the first plate group 4-3 is D3-1, the plate spacing of the second plate group 4-4 is D3-2, and D3-1>D3-2 is set, so that the fluid in the retention area close to the baffle plate 3-3 is subjected to less resistance, which is conducive to uniform distribution.

[0055] In some embodiments, the plate spacing of the second plate group 4-4 is greater than or equal to the spacing of the heat exchange flow channels, the plate spacing of the first plate group 4-3 is less than or equal to 1.5 times the plate spacing of the second plate group 4-4, and the plate stacking thickness of the first plate group 4-3 is 1 / 4 to 1 / 3 of the plate stacking thickness of the second grid plate 4-2.

[0056] Set D3-2≥D0, because there are few impurities or large particles in the fluid flowing out of the core plate bundle 2, the impact of impurity blockage can be ignored, and the focus is on improving the resistance difference caused by the change in flow direction. Set D3-2<D3-1≤1.5D3-2 to ensure the improvement effect of the resistance difference in the retention area. Figure 8 As shown, the plate stacking thickness of the first plate group 4-3 is H1, and the plate stacking thickness of the second grid plate 4-2 as a whole is H0. It is set that H1=(1 / 4~1 / 3)H0 to ensure a uniform effect on the overall resistance of the fluid.

[0057] In some embodiments, Figures 6 to 8 As shown, in the grid plate assembly 4 near the baffle plate 3-3, the plate spacing of the first grid plate 4-1 is greater than or equal to the plate spacing of the second plate group 4-4; or Figures 9 to 11 As shown, in the grid plate assembly 4 near the baffle 3-3, the first grid plate 4-1 includes a third plate group 4-5 and a fourth plate group 4-6 stacked along the stacking direction of the heat exchange plate, and a partition 4-7 parallel to the baffle 3-3 is provided between the third plate group 4-5 and the fourth plate group 4-6, the third plate group 4-5 is arranged close to the baffle 3-3, and the plate spacing of the third plate group 4-5 is greater than the plate spacing of the fourth plate group 4-6.

[0058] On the basis of adjusting the spacing density of the plates of the second grid plate 4-2, the first grid plate 4-1 does not need to adjust the spacing density of the plates because it is farther away from the position where the flow direction of the fluid changes than the second grid plate 4-2. Figure 7 As shown, the plate spacing of the first grid plate 4-1 is D4, and D4≥D3-2 is set. The structure is simple and can ensure the flow distribution effect, so that the overall resistance of the fluid passing through the baffle 3-3 does not increase significantly.

[0059] In addition, the spacing density of the first grid plate 4-1 can be adjusted, such as Fig.10 and Fig.11 As shown, the first grid plate 4-1 includes a third plate group 4-5 and a fourth plate group 4-6 stacked along the stacking direction of the heat exchanger plates. A partition 4-7 parallel to the baffle plate 3-3 is provided between the third plate group 4-5 and the fourth plate group 4-6 for easy fixation. The third plate group 4-5 is arranged close to the baffle plate 3-3. The plate stacking direction of the third plate group 4-5 is perpendicular to the stacking direction of the heat exchanger plates. The plate stacking direction of the fourth plate group 4-6 is also perpendicular to the stacking direction of the heat exchanger plates. The plate spacing of the third plate group 4-5 is D4-1, and the plate spacing of the fourth plate group 4-6 is D4-2. D4-1>D4-2 is set, which also makes the fluid in the retention area close to the baffle plate 3-3 less subject to resistance, which is conducive to uniform distribution.

[0060] like Fig.11 As shown, the length of the third plate group 4-5 along the stacking direction is H2, and H2≤H1 can be set to ensure uniform effect on overall resistance of the fluid. In addition, D4-1≥D3-1 and D4-2≥D3-2 can be set to ensure flow distribution effect.

[0061] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of the above embodiments of the present application, which are not provided in detail for the sake of simplicity.

[0062] In addition, when details are set forth to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the present application embodiments can be implemented without these details or with changes in these details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0063] While the present application has been described in conjunction with embodiments thereof, many alternatives, modifications and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

[0064] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A heat exchanger, characterized in that: include: frame; A core plate bundle is arranged in the frame, and includes a plurality of stacked heat exchange plates, and heat exchange channels are formed between adjacent heat exchange plates, and the heat exchange channels form at least one heat exchange process in the core plate bundle; A pipe box assembly is arranged outside the core plate bundle and communicated with the port of the heat exchange flow channel; A grid plate assembly is arranged in the pipe box assembly, located at the port inlet of the heat exchange process, and includes at least two grid plates arranged at intervals along the extension direction of the heat exchange process, each of the grid plates includes a plurality of plates stacked and arranged at intervals, and the plate stacking directions of two adjacent grid plates are staggered; in the grid plate assembly, the grid plate close to the port inlet of the heat exchange process is the first grid plate, and the remaining grid plates are the second grid plates, and the plate stacking direction of the first grid plate is perpendicular to the heat exchange plate stacking direction of the core plate bundle.

2. The heat exchanger according to claim 1, characterized in that The thickness of the plate is 6 mm to 15 mm, the spacing between the plates is 0.3 times to 2.0 times the spacing between the heat exchange channels, and the length of the plate along the extension direction of the heat exchange flow path is 50 mm to 200 mm.

3. The heat exchanger according to claim 1, characterized in that The heat exchange flow channel includes a cold side flow channel and a hot side flow channel, the hot side flow channel forms at least one hot side process in the core plate bundle, the pipe box assembly includes a cold side pipe box and a hot side pipe box, and the grid plate assembly is arranged in the hot side pipe box and is located at the port inlet of each hot side process.

4. The heat exchanger according to claim 1, characterized in that The plate spacing of the first grid plate is greater than or equal to the plate spacing of the second grid plate, the spacing between the first grid plate and the core plate bundle is greater than or equal to the spacing between the second grid plate and the first grid plate, or the spacing between the second grid plate and the first grid plate is equal to the spacing between two adjacent second grid plates.

5. The heat exchanger according to claim 4, characterized in that The distance between the first grid plate and the core plate bundle is 200 mm to 400 mm, and the distance between the second grid plate and the first grid plate is 100 mm to 200 mm.

6. The heat exchanger according to claim 1, characterized in that The heat exchange flow channel forms a multi-pass heat exchange process, and at least one baffle is provided in the pipe box assembly. A group of grid plate assemblies are provided at the port inlet of each heat exchange process after the second pass. The grid plate assembly is arranged close to the baffle, and includes a first grid plate and a second grid plate arranged perpendicular to each other.

7. The heat exchanger according to claim 6, characterized in that In the grid plate assembly close to the baffle, the plate spacing in at least a portion of the region close to the baffle is greater than the plate spacing in at least a portion of the region away from the baffle.

8. The heat exchanger according to claim 7, characterized in that In the grid plate assembly close to the baffle, the second grid plate includes a first plate group and a second plate group stacked along the stacking direction of the heat exchange plate, the first plate group is arranged close to the baffle, and the plate spacing of the first plate group is greater than the plate spacing of the second plate group.

9. The heat exchanger according to claim 8, characterized in that The plate spacing of the second plate group is greater than or equal to the spacing of the heat exchange flow channels, the plate spacing of the first plate group is less than or equal to 1.5 times the plate spacing of the second plate group, and the plate stacking thickness of the first plate group is 1 / 4 to 1 / 3 of the plate stacking thickness of the second grid plate.

10. The heat exchanger according to claim 8, characterized in that In the grid plate assembly close to the baffle, the plate spacing of the first grid plate is greater than or equal to the plate spacing of the second plate group; or, in the grid plate assembly close to the baffle, the first grid plate includes a third plate group and a fourth plate group stacked along the stacking direction of the heat exchange plate, a partition parallel to the baffle is provided between the third plate group and the fourth plate group, the third plate group is arranged close to the baffle, and the plate spacing of the third plate group is greater than the plate spacing of the fourth plate group.

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