Heat exchange plates and plate heat exchangers

Abstract

The utility model discloses a heat exchange plate piece and plate heat exchanger, heat exchange plate piece includes heat exchange area, flow guide area, set up in the corrugated structure of heat exchange area and set up in the flow guide structure of flow guide area, the corrugated structure includes a plurality of first convex stripe of interval arrangement along the first direction and a plurality of second convex stripe of interval arrangement along the first direction, first convex stripe and second convex stripe each interval along the first direction forms first flow channel, and first convex stripe and second convex stripe are alternately formula included angle joint along the second direction, wherein, first direction and second direction are perpendicular to each other, and the included angle joint of first convex stripe and second convex stripe is realized smooth transition through arc fillet, and the sharp corner of the included angle joint of first convex stripe and second convex stripe is eliminated, thereby avoiding the risk that the first flow channel is blocked to cause the first flow channel to be blocked by the risk that the elongated marine organism is hung in the sharp corner. The flow guide structure includes a plurality of interval distribution's convex, and the interval of convex along the second direction is used for constructing the second flow channel for guiding the fluid of flow guide area to first flow channel.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology for nuclear power plants, and in particular to a heat exchange plate and a plate heat exchanger. Background Technology

[0002] The cooling source systems of nuclear power plants include the Equipment Cooling Water System (RRI) and the Nuclear Power Plant Essential Water System (SEC). Both the RRI and SEC draw water downstream of the rotating drum filter in the Circulating Water Filtration System (CFI). The RRI / SEC heat exchanger is a key piece of equipment for cooling source water intake. Typically, the RRI / SEC heat exchanger uses a plate heat exchanger. Because the flowing medium inside the RRI / SEC heat exchanger comes from seawater in the marine environment, marine organisms frequently invade the equipment. In existing technologies, the upstream of the RRI / SEC heat exchanger is equipped with devices such as a drum filter and a net to intercept marine organisms with a diameter of 3 mm or more. However, some smaller marine organisms (such as helmet snails, with a shell opening diameter of about 1 mm and a length of about 5–25 mm) can still pass through the net and the drum filter to enter the RRI / SEC heat exchanger. The flow channels of the RRI / SEC heat exchanger are narrow and complex, and marine organisms entering the RRI / SEC heat exchanger can easily cause blockage of the flow channels. For example, existing plate heat exchangers have corrugated plates, which form sharp corners at the bends. When the pen cap screw moves along the corrugated flow path, it can easily get caught at these sharp corners, causing blockage. Blockage in the RRI / SEC heat exchanger's flow path can lead to an increase in the pressure differential of the nuclear power plant's cooling source-related systems, which is detrimental to the safe operation of the nuclear power plant. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an improved heat exchange plate and plate heat exchanger, addressing at least one deficiency mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to provide a heat exchange plate, which includes a heat exchange area, a flow guiding area, a corrugated structure and a flow guiding structure;

[0005] The corrugated structure is disposed in the heat exchange area; the corrugated structure includes a plurality of first convex strips and a plurality of second convex strips; the plurality of first convex strips are spaced apart along a first direction, and the plurality of second convex strips are spaced apart along the first direction, with each of the first and second convex strips forming a first flow channel along the interval of the first direction; the first and second convex strips are alternately connected along a second direction, and adjacent first and second convex strips along the second direction are connected at an angle; wherein, the first direction and the second direction are perpendicular to each other; and an arc-shaped rounded corner is formed at the angle where the first and second convex strips connected along the second direction are connected.

[0006] The flow guiding structure is disposed in the flow guiding region. The flow guiding structure includes a plurality of spaced protrusions. The spacing of the protrusions along the second direction is used to construct a second flow channel. The second flow channel is used to guide the fluid in the flow guiding region to the first flow channel.

[0007] Preferably, the radius of curvature of the arc-shaped fillet is 2 to 5 mm.

[0008] Preferably, the included angle between the first convex strip and the second convex strip is 60° to 75°.

[0009] Preferably, the flow guiding region includes a first flow guiding region and a second flow guiding region, wherein the first flow guiding region and the second flow guiding region are located on opposite sides of the heat exchange region along the first direction;

[0010] The heat exchange plate further includes a first corner hole, which is located on the side of the first flow guiding region away from the heat exchange region along the first direction. The first corner hole is used to guide fluid into the first flow guiding region. The flow guiding structure is at least partially disposed in the first flow guiding region, and the projection of the flow guiding structure in the first direction and the projection of the first corner hole in the first direction at least partially overlap.

[0011] Preferably, the heat exchange plate further includes a second corner hole, which is located on the side of the second flow guiding region away from the heat exchange region along the first direction, and the second corner hole is used to guide the fluid in the second flow guiding region to flow out from the second corner hole. The flow guiding structure is at least partially disposed in the second flow guiding region, and the projection of the flow guiding structure in the first direction and the projection of the second corner hole in the first direction at least partially overlap.

[0012] Preferably, the heat exchange plate further includes a reinforcing rib structure disposed in the heat exchange area.

[0013] Preferably, the reinforcing rib structure includes a plurality of first reinforcing ribs and a plurality of second reinforcing ribs;

[0014] Each of the first reinforcing ribs extends along the first direction, and each of the first reinforcing ribs is arranged at intervals along the first direction and the second direction, respectively.

[0015] Each of the second reinforcing ribs extends along the second direction, and the second reinforcing ribs are spaced apart along the first direction.

[0016] This utility model also provides a plate heat exchanger, which includes a plurality of heat exchange plates as described in any one of the above claims, wherein the plurality of heat exchange plates are arranged at intervals.

[0017] Preferably, the spacing between adjacent heat exchange plates is 4.4 mm to 4.6 mm.

[0018] Preferably, the protrusions on adjacent heat exchange plates are in direct contact with each other, and the protrusions of two adjacent heat exchange plates, spaced along the second direction, together enclose and define the closed second flow channel.

[0019] This invention has at least the following beneficial effects: The angled junction of the first and second protrusions, which meet along the second direction, forms an arc-shaped rounded corner. That is, the arc-shaped rounded corner achieves a smooth transition at the junction of the first and second protrusions along the second direction. This eliminates the sharp angle at the junction of the first and second protrusions, thus avoiding the risk of slender marine organisms, such as pen cap snails, getting caught at the sharp corner and causing blockage of the first flow channel. Furthermore, the flow-guiding structure in the flow-guiding area includes multiple spaced protrusions, which increase the compressive strength of individual heat exchange plates. Simultaneously, the spacing of the protrusions along the second direction forms a second flow channel, which guides the fluid in the flow-guiding area to the first flow channel. When fluid enters the flow-guiding area from the first corner hole, at least a portion of the fluid is guided downwards to the heat exchange area by the second flow channel formed by the protrusions, thereby reducing the risk of fluid "short-circuiting." Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. In the accompanying drawings:

[0021] Figure 1 This is an exploded structural diagram of a plate heat exchanger in some embodiments of this utility model;

[0022] Figure 2 This is a schematic diagram of the planar structure of the heat exchange plate in some embodiments of this utility model;

[0023] Figure 3 yes Figure 2 A magnified structural diagram of part A in the diagram;

[0024] Figure 4 yes Figure 2 A magnified structural diagram of part B in the diagram;

[0025] Figure 5 This is a schematic cross-sectional view of the flow guiding structure of two adjacent heat exchange plates in some embodiments of the plate heat exchanger of the present invention along the thickness direction of the heat exchange plates.

[0026] Figure 6 This is a partial structural schematic diagram of the heat exchange area of ​​the heat exchange plate in some embodiments of this utility model. Detailed Implementation

[0027] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] It should be noted that, unless otherwise explicitly specified and limited, terms such as "set up" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two elements or the interaction between two elements. When an element is referred to as being "on" or "below" another element, that element can be located "directly" or "indirectly" on the other element, or there may be one or more intermediary elements. The terms "first," "second," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] Please see Figure 1 This utility model provides a plate heat exchanger, which includes multiple heat exchange plates 1, which are spaced apart along a third direction C3. The third direction C3 is also the thickness direction of the heat exchange plates 1. In some embodiments, this plate heat exchanger is applied to the cold source filtration system of a nuclear power plant, and the plate heat exchanger is a key piece of equipment for the cold source water intake of a nuclear power plant.

[0030] In existing nuclear power plant plate heat exchangers, the spacing of the heat exchange plates 1 along the third direction C3 is typically 3.3mm to 3.8mm, which is sufficient to intercept most common, larger marine organisms. However, some smaller, slender marine organisms, such as helminth snails with a shell opening diameter of only about 1mm and a length of about 5 to 25mm, can easily pass through the interception nets and drum-shaped filters and enter the flow channels of the plate heat exchanger, causing blockage. To solve this problem, in some embodiments of the plate heat exchanger of this invention, the spacing D between adjacent heat exchange plates 1 is 4.4mm to 4.6mm. That is, increasing the spacing D of the heat exchange plates 1 improves the flowability of slender marine organisms in the plate heat exchanger and reduces the risk of blockage in the flow channels.

[0031] Please see Figures 1 to 4 The present invention also provides a heat exchange plate 1. The heat exchange plate 1 is used in a plate heat exchanger and includes a heat exchange region 11, a flow guiding region 12, a corrugated structure 13 and a flow guiding structure 14.

[0032] likeFigure 3 As shown, a corrugated structure 13 is disposed in the heat exchange region 11. The corrugated structure 13 includes a plurality of first protrusions 131 and a plurality of second protrusions 132. The plurality of first protrusions 131 are arranged at intervals along a first direction C1, and the plurality of second protrusions 132 are also arranged at intervals along the first direction C1. The first protrusions 131 and the second protrusions 132 each form a first flow channel 110 at the intervals along the first direction C1. The first direction C1 can be the length direction of the heat exchange plate 1. The first protrusions 131 and the second protrusions 132 are alternately connected along the second direction C2. That is, along the second direction C2, they are connected sequentially in the order of first protrusion 131-second protrusion 132-first protrusion 131 or second protrusion 132-first protrusion 131-second protrusion 132. The second direction C2 can be the width direction of the heat exchange plate 1. The first direction C1, the second direction C2, and the third direction C3 are mutually perpendicular to each other, forming a three-dimensional coordinate system.

[0033] Furthermore, the first protrusion 131 and the second protrusion 132 adjacent along the second direction C2 meet at an included angle. That is, the first protrusion 131 and the second protrusion 132 meeting along the second direction C2 form an included angle of 0 to 90°. In other words, the first protrusion 131 and the second protrusion 132 adjacent along the second direction C2 are bent and connected. An arc-shaped rounded corner 133 is formed at the junction of the included angle of the first protrusion 131 and the second protrusion 132 meeting along the second direction C2. That is, the junction of the included angle of the first protrusion 131 and the second protrusion 132 meeting along the second direction C2 achieves a smooth transition through the arc-shaped rounded corner 133. Thus, the sharp corner at the junction of the included angle of the first protrusion 131 and the second protrusion 132 is eliminated, thereby avoiding the risk of slender marine organisms such as pen cap snails getting caught at the sharp corner and causing blockage of the first flow channel 110.

[0034] Although increasing the spacing D of the heat exchange plates 1 in a plate heat exchanger can improve the flow of slender marine organisms within the plate heat exchanger, it also increases the amount of fluid flowing between adjacent heat exchange plates 1. This leads to a greater fluid impact force on individual heat exchange plates 1, making them more susceptible to insufficient rigidity and deformation. Within the flow guiding region 12 of a single heat exchange plate 1, the area near the corner holes is where the inter-plate flow velocity is highest, and it is also the weakest point in terms of overall pressure resistance.

[0035] To increase the compressive strength of a single heat exchange plate 1, such as Figure 4 As shown, a flow guiding structure 14 is disposed in the flow guiding region 12. The flow guiding structure 14 includes a plurality of spaced protrusions 140, which can increase the compressive strength of a single heat exchange plate 1. Specifically, the protrusions 140 can be obtained during the forming stage of the heat exchange plate 1 by designing a specific mold and then by processes such as stamping. Each protrusion 140 can be circular or other shapes.

[0036] like Figure 2 As shown, the heat exchange plate 1 includes a first corner hole 151, a second corner hole 152, a third corner hole 153, and a fourth corner hole 154. The first corner hole 151, second corner hole 152, third corner hole 153, and fourth corner hole 154 are arranged in a counter-clockwise order at the four corners of the heat exchange plate 1. When the plate heat exchanger is in use, the higher-temperature fluid enters the flow guiding region 12 through the first corner hole 151, passes through the heat exchange region 11, and then flows out through the second corner hole 152 to the next heat exchange plate 1. Because the heat exchange plates 1 of the plate heat exchanger are installed vertically, the fluid medium, under the influence of gravity, tends to concentrate its flow in the flow guiding region 12 directly below the first corner hole 151, which may lead to a fluid "short-circuit" phenomenon. The fluid "short-circuit" phenomenon refers to the fluid not flowing from the first corner hole 151 to the second corner hole 152, but instead flowing directly from the first corner hole 151 along the second direction C2 to the fourth corner hole 154. Fluid flowing directly from the first corner hole 151 to the fourth corner hole 154 along the second direction C2 does not pass through the heat exchange zone 11 for heat exchange, which will lead to a decrease in heat exchange efficiency.

[0037] To reduce fluid "short circuit" phenomena, please refer to [link / reference]. Figure 4 and Figure 5 As shown. Among them, Figure 5 A cross-sectional schematic diagram of the flow guiding structure 14 of two adjacent heat exchange plates 1 along the thickness direction of the heat exchange plates 1 is shown. The intervals of the protrusions 140 along the second direction C2 are used to construct a second flow channel 120. The second flow channel 120 is connected to the first flow channel 110. The second flow channel 120 is used to guide the fluid in the flow guiding region 12 to the first flow channel 110. When the fluid enters the flow guiding region 12 from the first corner hole 151, at least a portion of the fluid is forced downward to the heat exchange region 11 by the second flow channel 120 formed by the protrusions 140, thereby reducing the risk of fluid "short-circuiting".

[0038] Furthermore, in some embodiments, such as Figure 5 As shown, the protrusions 140 on two adjacent heat exchange plates 1 along the third direction C3 are in direct contact with each other, and the protrusions 140 of the two adjacent heat exchange plates 1 together enclose and define a closed second flow channel 120 along the second direction C2. Specifically, as Figure 5In the illustrated embodiment, two adjacent heat exchange plates 1 along the third direction C3 are defined as the first plate and the second plate, respectively. The protrusions 140 on the flow guiding region 12 of the first plate are spaced apart along the second direction C2, and this spacing is defined as the first interval. Similarly, the protrusions 140 on the flow guiding region 12 of the second plate are spaced apart along the second direction C2, and this spacing is defined as the second interval. The opening directions of the first and second intervals are directly opposite each other. Thus, the first and second intervals together enclose a closed second flow channel 120. This second flow channel 120 extends along the first direction C1, guiding at least a portion of the fluid in the flow guiding region 12 to the first flow channel 110 on the heat exchange region 11. After heat exchange in the heat exchange region 11, the fluid flows out through the second corner hole 152, thereby achieving effective heat exchange.

[0039] In some embodiments, the radius of curvature of the arc-shaped fillet 133 is 2 to 5 mm. The included angle formed by the first protrusion 131 and the second protrusion 132 is 60° to 75°.

[0040] Please see Figure 2 In some embodiments, the flow guiding region 12 includes a first flow guiding region 121 and a second flow guiding region 122, which are located on opposite sides of the heat exchange region 11 along the first direction C1. (See reference...) Figure 2 In the orientation of the heat exchange region 11, the first flow guiding region 121 and the second flow guiding region 122 are located on the upper and lower sides of the heat exchange region 11, respectively. The first corner hole 151 is located on the side of the first flow guiding region 121 away from the heat exchange region 11 along the first direction C1. The first corner hole 151 is used to guide fluid into the first flow guiding region 121. The flow guiding structure 14 is at least partially disposed in the first flow guiding region 121, and the projection of the flow guiding structure 14 in the first direction C1 and the projection of the first corner hole 151 in the first direction C1 at least partially overlap. That is, referring to... Figure 2 The flow guiding structure 14 is positioned at least partially directly below the first corner hole 151. When the plate heat exchanger is in use, the higher-temperature fluid enters the first flow guiding region 121 through the first corner hole 151, and at least a portion of the fluid is forced downwards to the heat exchange region 11 through the second flow channel 120 formed by the protrusion 140. Therefore, the flow guiding structure 14 is positioned at least partially directly below the first corner hole 151 used to guide the fluid in, which helps to guide more fluid to the heat exchange region 11 and reduces the risk of fluid "short-circuiting".

[0041] Please see Figure 2In some embodiments, the second corner hole 152 is located on the side of the second flow guiding region 122 away from the heat exchange region 11 along the first direction C1, and the second corner hole 152 is used to guide the fluid in the second flow guiding region 122 to flow out from the second corner hole 152. Specifically, when the plate heat exchanger is working, the fluid first enters from the first corner hole 151, then flows sequentially through the first flow guiding region 121, the heat exchange region 11, the second flow guiding region 122, and the second corner hole 152, and flows out from the second corner hole 152. The flow guiding structure 14 is at least partially disposed in the second flow guiding region 122, and the projection of the flow guiding structure 14 in the first direction C1 and the projection of the second corner hole 152 in the first direction C1 at least partially overlap. That is, referring to... Figure 2 In the orientation of the flow guide structure 14, at least part of it is located directly above the second corner hole 152. That is, the flow guide structure 14 is simultaneously provided in the first flow guide region 121 and the second flow guide region 122. During the process of fluid flowing from the heat exchange region 11 to the second flow guide region 122, at least part of the fluid is forced downward to the second corner hole 152 through the second flow channel 120 formed by the protrusion 140, reducing the probability of fluid "short-circuiting" by flowing directly from the second flow guide region 122 along the second direction C2 to the third corner hole 153.

[0042] like Figure 2 and Figure 6 As shown, in some embodiments, the heat exchange plate 1 further includes a reinforcing rib structure 16 disposed in the heat exchange region 11. This reinforcing rib structure 16 is used to increase the compressive strength of a single heat exchange plate 1. Further, in some embodiments, the reinforcing rib structure 16 includes a plurality of first reinforcing ribs 161 and a plurality of second reinforcing ribs 162. Each first reinforcing rib 161 extends along a first direction C1, and the first reinforcing ribs 161 are spaced apart along the first direction C1 and the second direction C2, respectively. Each second reinforcing rib 162 extends along the second direction C2 to both edges of the heat exchange region 11 along the second direction C2, and the second reinforcing ribs are spaced apart along the first direction C1.

[0043] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A heat exchange plate (1), characterized in that, It includes a heat exchange area (11), a flow guiding area (12), a corrugated structure (13), and a flow guiding structure (14); The corrugated structure (13) is disposed in the heat exchange area (11); the corrugated structure (13) includes a plurality of first protrusions (131) and a plurality of second protrusions (132); the plurality of first protrusions (131) are spaced apart along a first direction (C1), the plurality of second protrusions (132) are spaced apart along the first direction (C1), and the first protrusions (131) and the second protrusions (132) each form a first flow channel (110) at the interval along the first direction (C1); the first protrusions (131) and the second protrusions (132) are alternately connected along a second direction (C2), and the first protrusions (131) and the second protrusions (132) adjacent along the second direction (C2) are connected at an angle; wherein, the first direction (C1) and the second direction (C2) are perpendicular to each other; an arc-shaped rounded corner (133) is formed at the angle where the first protrusions (131) and the second protrusions (132) connected along the second direction (C2) are connected at an angle; The flow guiding structure (14) is disposed in the flow guiding region (12). The flow guiding structure (14) includes a plurality of spaced protrusions (140). The spacing of the protrusions (140) along the second direction (C2) is used to construct a second flow channel (120). The second flow channel (120) is used to guide the fluid in the flow guiding region (12) to the first flow channel (110).

2. The heat exchange plate (1) according to claim 1, characterized in that, The radius of curvature of the arc-shaped fillet (133) is 2 to 5 mm.

3. The heat exchange plate (1) according to claim 1, characterized in that, The included angle formed by the first protrusion (131) and the second protrusion (132) is 60° to 75°.

4. The heat exchange plate (1) according to claim 1, characterized in that, The flow guiding region (12) includes a first flow guiding region (121) and a second flow guiding region (122), wherein the first flow guiding region (121) and the second flow guiding region (122) are respectively located on opposite sides of the heat exchange region (11) along the first direction (C1); The heat exchange plate (1) further includes a first corner hole (151), which is located on the side of the first flow guiding region (121) away from the heat exchange region (11) along the first direction (C1). The first corner hole (151) is used to guide fluid into the first flow guiding region (121). The flow guiding structure (14) is at least partially disposed in the first flow guiding region (121), and the projection of the flow guiding structure (14) in the first direction (C1) and the projection of the first corner hole (151) in the first direction (C1) at least partially overlap.

5. The heat exchange plate (1) according to claim 4, characterized in that, The heat exchange plate (1) further includes a second corner hole (152), which is located on the side of the second flow guiding region (122) away from the heat exchange region (11) along the first direction (C1). The second corner hole (152) is used to guide the fluid of the second flow guiding region (122) to flow out from the second corner hole (152). The flow guiding structure (14) is at least partially disposed in the second flow guiding region (122), and the projection of the flow guiding structure (14) in the first direction (C1) and the projection of the second corner hole (152) in the first direction (C1) at least partially overlap.

6. The heat exchange plate (1) according to claim 1, characterized in that, The heat exchange plate (1) also includes a reinforcing rib structure (16) disposed in the heat exchange area (11).

7. The heat exchange plate (1) according to claim 6, characterized in that, The reinforcing rib structure (16) includes a plurality of first reinforcing ribs (161) and a plurality of second reinforcing ribs (162); Each of the first reinforcing ribs (161) extends along the first direction (C1), and each of the first reinforcing ribs (161) is arranged at intervals along the first direction (C1) and the second direction (C2); Each of the second reinforcing ribs (162) extends along the second direction (C2), and the second reinforcing ribs are spaced apart along the first direction (C1).

8. A plate heat exchanger, characterized in that, It includes a plurality of heat exchange plates (1) as described in any one of claims 1 to 7, wherein the plurality of heat exchange plates (1) are arranged at intervals.

9. The plate heat exchanger according to claim 8, characterized in that, The spacing (D) between adjacent heat exchange plates (1) is 4.4 mm to 4.6 mm.

10. The plate heat exchanger according to claim 8, characterized in that, The protrusions (140) on adjacent heat exchange plates (1) are in direct contact with each other, and the protrusions (140) of two adjacent heat exchange plates (1) together enclose and define the closed second flow channel (120) along the second direction (C2).

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