Plate Heat Exchanger Configuration

Abstract

The plate heat exchanger configuration (1) comprises at least a first plate pack (2) and a second plate pack (3) arranged adjacent to each other inside an outer casing, wherein the diameter of the first plate pack (2), defined by the outer edges of the heat exchange plates, is larger than the diameter of the second plate pack (3).

Description

[Technical Field]

[0001] The present invention relates to a plate heat exchanger arrangement according to the independent claims set out below. The present invention also relates to a modular construction comprising a plate heat exchanger arrangement according to the invention. [Background technology]

[0002] A plate-and-shell heat exchanger is composed of a plate pack formed by heat exchange plates and an outer casing surrounding the plate pack, functioning as a pressure vessel. The plate pack is composed of multiple plate pairs. Each plate pair is typically formed of two heat exchange plates attached to each other at least around their peripheries. Each heat exchange plate has at least two openings for the flow of a heat exchange medium. Adjacent plate pairs are attached to each other by connecting the openings of the adjacent plate pairs to each other. A primary circuit of the heat exchanger is formed between the openings of the heat exchange plates at the inner side where the plate pairs are connected to each other through the flow passages formed by the openings of the heat exchange plates. A secondary circuit is formed between the connecting portions of the outer casing surrounding the plate pack, and these are arranged in relation to the spaces between the plate pairs of the plate pack. The primary heat exchange medium flows through the spaces between every other plate, and the secondary heat exchange medium flows through the spaces between every other plate.

[0003] Some applications require several heat exchangers, but the space available for the heat exchangers is limited, so it is beneficial to arrange the heat exchangers as compactly as possible. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide a compact plate heat exchanger arrangement comprising at least two plate packs inside the same common outer casing, the plate packs having a common shell side, and which can be used as such a heat exchanger, but which can also be utilized in a modular construction.

[0005] It is also an object of the present invention to provide a plate heat exchanger structure that is easy to manufacture.

[0006] In order to achieve the objects set out above, the invention is characterized by what is presented in the characterizing parts of the independent claims. Some preferred embodiments of the invention are set out in the further claims. [Means for solving the problem]

[0007] A typical plate heat exchanger configuration according to the present invention comprises at least: - 1st Plate Pack - Second Plate Pack The first plate pack and the second plate pack are formed by heat exchanger plates, each having at least two openings, and arranged one on top of the other. The heat exchanger plates are attached to each other to form a plate pair, and inner portions of the plate pair are connected to each other via flow paths formed by the openings in the heat exchanger plates. A primary circuit of the heat exchanger is formed between the openings in the heat exchanger plates. -Common outer casing A common outer casing surrounds the first plate pack and the second plate pack, and the outer casing includes a cylindrical shell extending in a longitudinal direction and end plates disposed at opposite ends of the shell. - inlet and outlet connections of the first plate pack connected to the flow passages of the first plate pack; - inlet and outlet connections of the second plate pack connected to the flow path of the second plate pack; - inlet and outlet connections for the heat exchange medium flowing inside the shell; Inlet and outlet connections are arranged through the outer casing, a secondary circuit is formed between the connections of the outer casing, the outer casing is arranged in communication with the spaces between the plate pairs of the plate pack, the first and second plate packs have a common shell side in a heat exchanger configuration, and a heat exchange medium flows inside the shell.In the plate heat exchanger configuration, the first plate pack and the second plate pack are arranged side by side inside the common outer casing, and the first plate pack has a diameter defined by the outer edges of the heat exchange plates, the diameter being larger than the diameter of the second plate pack.

[0008] In a typical plate heat exchanger configuration according to the present invention, at least two plate packs have different diameters, the diameters being defined by the outer edges of the heat exchange plates of the plate packs, and the at least two plate packs are arranged adjacent to each other inside the same common outer casing. This configuration provides more space for arranging the inlet and / or outlet connections of the plate packs through the same end plate of the outer casing. Arranging two or more plate packs inside the same outer casing also allows for the division of a common shell side in the heat exchanger configuration. This is an advantageous configuration when the space available for multiple heat exchangers is limited. In a typical embodiment according to the present invention, the shell side is common to all plate packs in the arrangement. The shell side can be simply constructed without complex structures, for example, simplifying the piping work required for the heat exchanger configuration according to the present invention.

[0009] A typical module construction according to the invention comprises at least two modules arranged inside the same outer casing, the modules being separated from each other by a partition wall, with at least one module being formed from a plate heat exchanger arrangement according to the invention comprising at least two plate packs.

[0010] According to one embodiment of the present invention, the construction of the arrangement according to the present invention provides a fully welded plate heat exchanger construction, which does not affect the pressure tightness of the heat exchanger. [Brief explanation of the drawings]

[0011] The present invention will now be described in more detail with reference to the accompanying drawings, in which: FIG. 1 shows a plate heat exchanger configuration according to one embodiment of the invention with two plate packs arranged inside the same common outer casing. FIG. 2 shows a plate heat exchanger configuration according to another embodiment of the invention, in which two plate packs are arranged inside the same common outer casing. FIG. 3 shows a plate heat exchanger configuration according to one embodiment of the invention with three plate packs arranged inside the same common outer casing. DETAILED DESCRIPTION OF THE INVENTION

[0012] The plate heat exchanger configuration according to the present invention comprises at least two plate packs, a first plate pack and a second plate pack, and an outer casing surrounding them. The outer casing comprises a shell, a first end plate, and a second end plate, the end plates being disposed at the ends of the shell. In a typical embodiment according to the present invention, the shell is a substantially horizontal cylindrical shell, and the end plates are vertical end plates. The longitudinal direction of the outer casing or cylindrical shell is the direction between the end plates of the outer casing, and typically means the horizontal direction. When the cylindrical shell of the outer casing is a straight cylinder, its longitudinal direction is the same as the direction of the central axis of the cylinder.

[0013] In the plate heat exchanger configuration according to the present invention, a first plate pack and a second plate pack are formed by heat exchange plates, each having at least two openings and arranged one above the other. The plate pack has an end portion in the direction of the heat exchange plates and an outer surface defined by the outer edges of the heat exchange plates. In a preferred embodiment of the present invention, both ends of the plate pack are provided with separate supporting end plates. The plate pack is composed of a plurality of plate pairs. Each plate pair is typically formed by two heat exchange plates, which are attached together at least along their peripheries. Each heat exchange plate has at least two openings for the flow of a heat exchange medium. Adjacent plate pairs are attached to each other by attaching the openings of the adjacent plate pairs to each other. The inner portions of the plate pairs are arranged to be connected to each other via channels formed by the openings in the heat exchange plates. In the plate pack, the heat exchange medium can flow from one plate pair to another through the openings. In an embodiment according to the present invention, the heat exchange plates are typically circular, and the plate pack is mainly cylindrical in shape. The plate pack can also be formed, for example, of semicircular or elliptical heat exchanger plates, the longitudinal direction of the plate pack being the same as the longitudinal direction of the cylindrical shell.

[0014] A common outer casing surrounds the plate packs arranged adjacent to each other inside the outer casing, and preferably a common cylindrical shell surrounds the plate packs. In an embodiment of the invention, a first plate pack and a second plate pack are arranged adjacent to each other inside the same common outer casing, and the first plate pack has a diameter defined by the outer edges of the heat exchange plates that is larger than the diameter of the second plate pack.

[0015] According to one embodiment of the present invention, at least one partition plate is arranged between the first plate pack and the second plate pack. According to one embodiment of the present invention, the partition plate arranged between adjacent plate packs is sized to at least correspond to the size of the larger diameter plate pack. In one embodiment of the present invention, the partition plate is sized so that one edge of the partition plate is connected to the inner surface of the outer case. The partition plate between adjacent plate packs provides a tight structure for plate packs of different sizes defined by the diameters of the heat exchange plates. In one embodiment of the present invention, the partition plate is arranged in an elongated shape on one side of the plate pack from the outer surface of the plate pack toward the inner surface of the shell, thereby forming multiple paths for the heat exchange medium on the common shell side of the heat exchanger.

[0016] According to one embodiment of the present invention, the partition plates disposed between adjacent plate packs have a thickness of approximately 20 to 100 mm. The intermediate plates support the structure of the plate packs, improving their pressure resistance.

[0017] According to one embodiment of the present invention, the plate heat exchanger configuration further includes a third plate pack, in which three plate packs, namely, the first plate pack, the second plate pack, and the third plate pack, are arranged adjacent to one another inside the same common outer casing. Like the first and second plate packs, the third plate pack also has at least two openings and is formed of heat exchange plates arranged one on top of another. The third plate pack has an end portion facing the heat exchange plates and an outer surface defined by the outer edges of the heat exchange plates, the heat exchange plates being attached as plate pairs, and the inner portions of the plate pairs are connected to one another through channels formed by the openings in the heat exchange plates. According to one embodiment of the present invention, these three plate packs are arranged adjacent to one another inside the same common outer casing, and at least the first plate pack has a diameter larger than the second and third plate packs. According to one embodiment of the present invention, the third plate pack has a diameter defined by the outer edges of the heat exchange plates, which is at least smaller than the diameter of the first plate pack. According to one embodiment of the present invention, the third plate pack has a diameter defined by the outer edges of the heat exchange plates that is smaller than the diameters of the first and second plate packs. The plate packs can be arranged adjacent to one another inside the outer casing in any order. According to the present invention, at least one plate pack has a larger diameter than the other plate packs. In an embodiment according to the present invention, all plate packs arranged adjacent to one another have different diameters.

[0018] When the plate heat exchanger configuration includes three plate packs, the plate heat exchanger configuration can also include a second partition plate disposed between the third plate pack and the adjacent plate pack. The partition plate corresponds to the partition plate between the first and second plate packs described above. The partition plate has a size at least equivalent to the size of the larger-diameter plate pack. In a typical embodiment, the partition plate is sized so that one edge of the partition plate is connected to the inner surface of the outer casing. In an embodiment of the present invention including three adjacent plate packs, the middle plate pack is located between the partition plates, and these partition plates can also define a flow path for the heat exchange medium flowing inside the common shell side. That is, these partition plates extend from the outer surface of the plate pack to the inner surface of the shell on one side of the plate pack. In one embodiment of the present invention, the shell side has one common inlet connection, and the shell side outlet connection is located in the space between the partition plates.

[0019] Also, the plate heat exchanger configuration according to the invention can comprise more than three plate packs, with at least a first plate pack having a larger diameter than the other plate packs. The invention is not limited to the above-mentioned configurations with plate packs of two or three different sizes. Although the plate heat exchanger configuration may comprise plate packs of similar sizes, the invention is based on at least two different sized plate packs arranged adjacent to each other inside the same common outer casing, thus providing more space for arranging the inlet and outlet connections of the plate pack with a smaller diameter on the same end plate of the same outer casing.

[0020] The plate pack according to the present invention may contain different amounts of plate pairs and can be sized based on the requirements of the application.

[0021] The plate heat exchanger configuration according to the present invention comprises an inlet connection and an outlet connection of each plate pack, which are connected to the flow passages of the plate pack. Thus, the primary circuit of the plate pack is formed between the inlet and outlet connections of the plate pack. The inlet and outlet connections of the secondary circuit are connected to the inside of the outer casing via the outer casing and are arranged in the space between the plate pairs. Typically, the plate pack primary and secondary circuits are separated from each other, i.e., the heat exchange medium flowing in the inner part of the plate pack cannot mix with the heat exchange medium flowing in the outer casing and the heat exchange medium flowing in the inner part of another plate pack.

[0022] In the plate heat exchanger configuration of the present invention, the inlet and outlet connections of the first plate pack are arranged to connect to the flow paths of the first plate pack. The inlet and outlet connections comprise connecting pipes, which are arranged through an end plate of the outer casing and connected to the flow paths of the plate pack. The inlet and outlet connections of the second plate pack, which are arranged to connect to the flow paths of the second plate pack, comprise connecting pipes, which are arranged through an end plate of the outer casing and connected to the flow paths of the plate pack. Correspondingly, according to one embodiment of the present invention, the third plate pack has inlet and outlet connections and comprises connecting pipes, which are arranged through an end plate of the outer casing and connected to the flow paths of the plate pack.

[0023] Adjacent plate packs with different outer diameters allow the inlet and / or outlet connections of the larger-sized plate pack to be easily arranged through the same end plate of the outer casing as the inlet and outlet connections of the smaller-sized plate pack. According to one embodiment of the present invention, the first plate pack has a diameter defined by the outer edges of the heat exchanger plates that is larger than the diameter of the second plate pack, and the inlet and / or outlet connections of the first plate pack are arranged outside the outer surface of the second plate pack. And / or the second plate pack has a diameter defined by the outer edges of the heat exchanger plates that is larger than the diameter of the third plate pack, and the inlet and / or outlet connections of the second plate pack are arranged outside the outer surface of the third plate pack. In a preferred embodiment of the present invention, the inlet and / or outlet connections of the first plate pack and the outlet and inlet connections of the second plate pack are arranged through the same end plate, and the first plate pack has a diameter defined by the outer edges of the heat exchanger plates that is larger than the diameter of the second plate pack, and the inlet and / or outlet connections of the first plate pack are arranged outside the outer surface of the second plate pack. Also in the same way, in embodiments of the invention comprising three or more plate packs, the inlet and / or outlet connections of each plate pack are preferably arranged through the same end plate.

[0024] According to one embodiment of the present invention, the inlet and outlet connections of the plate pack comprise connecting pipes, which are arranged in a nested manner, and the outer diameter of the inlet connecting pipe is smaller than the diameter of the outlet connecting pipe and the flow passages of the plate pack. This allows the inlet and outlet connections of the plate pack to be arranged through the same end plate of the outer casing, providing a more compact structure. When the inlet and outlet connections are arranged in a nested manner and connected to one of the flow passages of the plate pack, a connecting pipe is arranged through the outlet connection of the plate pack to form the inlet connection of the plate pack, the inlet connecting pipe extends inside the flow passages of the plate pack, and the outlet connecting pipe is attached to the end of the plate pack to form a connection with the flow passage.

[0025] According to one embodiment of the present invention, the inlet and outlet connections of the plate pack can be arranged through one end plate of the outer casing, so that the plate heat exchanger arrangement provides a compact structure. This type of plate heat exchanger arrangement according to the present invention can be made with an openable end plate structure, so that the plate pack can be easily removed from the outer casing if necessary, for example for cleaning.

[0026] In the plate heat exchanger configuration of the present invention, the inlet and outlet connections for the heat exchange medium flowing inside the shell are arranged through the outer casing, typically the shell of the outer casing. The inlet and outlet connections on the shell side can be arranged through the end plates, through the shell, or any combination thereof. In a preferred embodiment of the present invention, a single heat exchange medium flows inside, i.e., through the shell side of the plate heat exchanger configuration and is common to all plate packs. According to one embodiment of the present invention, the plate heat exchanger configuration has one inlet connection and two outlet connections for the heat exchange medium flowing on the shell side, and if a partition plate between adjacent plate packs divides the shell section into two separate sections at the edge of the outer casing, each section has its own outlet connection. In an embodiment of the present invention, if the configuration has three plate packs and two partition plates, the plate heat exchanger configuration can have one inlet connection and three outlet connections for the heat exchange medium flowing on the shell side, and each section divided by the partition plate has its own outlet connection.

[0027] According to one embodiment of the present invention, a separate stop plate is arranged at least on one side of the plate pack between the outer surface of the plate pack and the inner surface of the shell to form a plurality of paths for the heat exchange medium on the shell side of the heat exchanger. According to one embodiment of the present invention, the stop plate may be welded to a partition plate arranged between adjacent plate packs. According to one embodiment, the stop plate is substantially planar in the direction of the heat exchange plates and is arranged on the plate heat exchanger structure in the direction of the heat exchange plates of the plate pack.

[0028] In the plate heat exchanger according to the invention, the heat exchange medium may be arranged in co-flow, counter-flow or cross-flow.

[0029] The plate heat exchanger arrangement according to the invention may for example be the heat exchanger itself or may be part of a modular structure.

[0030] The modular structure according to the invention comprises at least two modules arranged inside the same outer casing, the modules being separated from one another by a partition wall, at least one module being formed from a plate heat exchanger arrangement according to the invention, comprising at least two plate packs. According to one embodiment, the outer casing of the module is continuous over the length of the modular structure. In the modular structure, the partition wall between the plate heat exchanger arrangement and the adjacent module is an end plate of the outer casing of the plate heat exchanger arrangement. The structure according to the invention provides a compact modular structure, since at least two plate packs with heat exchange medium circulation can be arranged inside one modular section. These types of structures are advantageous when the space for the heat exchanger application is limited.

[0031] For clarity of description, the same reference numbers are used for corresponding parts in the different embodiments.

[0032] The plate heat exchanger arrangement 1 shown in Figures 1 to 3 comprises an outer casing formed by a substantially horizontal cylindrical shell 4 and first and second substantially vertical end plates 5a, 5b.

[0033] In Figures 1 and 2, a first plate pack 2 and a second plate pack 3 are arranged inside the same common outer casing. The first plate pack 2 and the second plate pack 3 are arranged overlapping each other with two openings, and the heat exchanger plates in the plate pack are attached to each other as plate pairs, with the inner portions of the plate pairs connected to each other via flow paths 2a, 2b, 3a, 3b formed by the openings in the heat exchanger plates. Each plate pack includes several plate pairs. The number of plate pairs is not constant, and the lengths of the plate packs in the longitudinal direction of the plate pack may differ from each other. The diameter of the first plate pack 2 is determined by the outer edges of the heat exchanger plates and is larger than the diameter of the second plate pack 3.

[0034] The first plate pack 2 and the second plate pack 3 are arranged adjacent to each other, and a partition plate 9 is arranged between the plate packs. As shown in the figure, the partition plate 9 has a size larger than that of the larger-diameter plate pack, and one edge of the partition plate is connected to the inner surface of the outer case, forming multiple paths for the heat exchange medium on the shell side of the heat exchanger. Typically, the partition plate 9 is arranged over at least the entire area of the larger-diameter plate pack.

[0035] In FIG. 1, the inlet and outlet connections 6a, 6b of the first plate pack 2 are arranged via different end plates 5a, 5b of the outer casing. As shown in FIG. 1, one of the connections 6b is arranged outside the outer surface of the second plate pack 3, so it can be easily arranged via the end plate 5b of the outer casing. Therefore, the outlet connection 6b of the first plate pack 2 and the inlet and outlet connections 7a, 7b of the second plate pack 3 are arranged via the same end plate 5b. The inlet and outlet connections 6a, 6b of the first plate pack 2 are arranged in a nested manner, and at least a portion of the internal connecting pipe (not shown in FIG. 1) can extend into the flow path 2b. The heat exchange medium circuit of the first plate pack 2 is formed between the inlet and outlet connections 6a, 6b, and may flow in either direction. In FIG. 1, the heat exchange medium circuit of the second plate pack 3 is formed between the inlet connection 7a and the outlet connection 7b, and may flow in either direction.

[0036] In Figure 2, the inlet and outlet connections 6a, 6b of the first plate pack 2 are arranged via the same end plate 5a, and the inlet and outlet connections 7a, 7b of the second plate pack 3 are arranged via the other end plate 5b of the outer casing.

[0037] 1 and 2, the shell side of the plate heat exchanger arrangement comprises one inlet connection 8a and two outlet connections 8b, 8c. The shell side comprises two paths formed by partition plates 9 arranged between the plate packs.

[0038] In the embodiment shown in FIG. 3, the plate heat exchanger configuration 1 comprises three plate packs: a first plate pack 2, a second plate pack 3, and a third plate pack 10. The diameter of the third plate pack 10 is defined by the outer edges of the heat exchange plates and is smaller than the diameters of the first plate pack 2 and the second plate pack 3. The diameter of the second plate pack 3 is also smaller than the diameter of the first plate pack 2. The plate packs are separated by partition plates 9, 11 disposed between the plate packs. As shown in FIG. 3, the partition plates 9, 11 extend at one edge to the inner surface of the outer casing, forming multiple paths for the heat exchange medium on the shell side of the heat exchanger. The partition plates 9, 11 cover the entire area of the larger plate pack to which they are connected. The heat exchange medium circuit of the first plate pack 2 is formed between the inlet and outlet connections 6a, 6b, as in FIG. 1. The inlet connection 7a of the second plate pack 3 is located inside the outlet connection 7b of the second plate pack, and the connections 7a, 7b are nested, with at least a portion of the inlet connection 7a extending inside the flow path 3b. In FIG. 3, the heat exchange medium circuit of the third plate pack 10 is formed between the inlet and outlet connections 12a, 12b, and the flow direction may be either direction. The inlet and outlet connections 12a, 12b are connected to the flow paths 10a, 10b of the third plate pack. In FIG. 3, one of the connecting portions of the first plate pack 2 is located outside the outer surface of the second plate pack 3, and the diameter of the first plate pack, defined by the outer edges of the heat exchange plates, is larger than the diameter of the second plate pack. Furthermore, the inlet and outlet connections 7a, 7b of the second plate pack 3 are arranged outside the outer surface of the third plate pack 10, and the diameter of the second plate pack defined by the outer edges of the heat exchange plates is larger than the diameter of the third plate pack. Therefore, the inlet or outlet connection of the first plate pack 2, the outlet and inlet connection of the second plate pack 3, and the outlet and inlet connection of the third plate pack 10 are arranged via the same end plate 5b of the outer casing.

[0039] In Figure 3, the shell side of the plate heat exchanger arrangement has one inlet connection 8a and three outlet connections 8b, 8c, 8d. The shell side has three paths for the heat exchange medium flowing inside the shell, which are formed by partition plates 9, 11 arranged between the plate packs. The outlet connections 8b, 8c, 8d are connected to the shell sections separated by the partition plates 9, 11, each shell section having its own outlet connection.

[0040] In the figure, the first plate pack 2 has supporting end plates 13a, 13b at the ends of the plate pack, the second plate pack 3 has supporting end plates 14a, 14b, and the third plate pack 10 has supporting end plates 15a, 15b.

[0041] The plate heat exchanger arrangement shown in Figures 1 to 3 may form such a plate heat exchanger or may be part of a modular structure, in which the plate heat exchanger arrangement shown in Figures 1 to 3 may be one module of the modular structure, with the end plate 5a forming a partition between the modular structure and a second module.

Claims

1. The plate heat exchanger configuration (1) comprises at least: - a first pack of plates (2), and a second pack of plates (3), a first plate pack (2) and a second plate pack (3), each formed by heat exchanger plates having at least two openings and arranged one on top of the other, the heat exchanger plates being attached to each other as a plate pair, inner portions of the plate pairs being arranged to be connected to each other via flow paths (2a, 2b, 3a, 3b) formed by the openings in the heat exchanger plates, and a primary circuit of the heat exchanger plates being formed between the openings in the heat exchanger plates; a common outer casing surrounding the first plate pack (2) and the second plate pack (3), the outer casing comprising an elongated cylindrical shell (4) and end plates (5a, 5b) arranged at both ends of the shell; - inlet and outlet connections (6a, 6b) of said first plate pack (2) connected to the channels (2a, 2b) of said first plate pack (2); - inlet and outlet connections (7a, 7b) of said second plate pack (3) connected to the channels (3a, 3b) of said second plate pack (3); inlet connections (8a) and outlet connections (8b, 8c) for the heat exchange medium flowing inside the shell, which are arranged through the outer casing and are connected to the spaces between the plate pairs of the plate pack, a secondary circuit being formed between the connections of the outer casing; Equipped with the first plate pack (2) and the second plate pack (3) are arranged adjacent to each other inside the common outer casing, the first plate pack (2) having a diameter defined by the outer edges of the heat exchange plates, the diameter being larger than the diameter of the second plate pack (3); A partition plate (9) is disposed between the first plate pack (2) and the second plate pack (3), The partition plate (9) has a size at least corresponding to the size of the first plate pack, The partition plate (9) is arranged on one side of the plate pack so as to further extend from the outer surface of the plate pack to the inner surface of the shell to form a plurality of paths for heat exchange medium on the shell side of the plate heat exchanger arrangement; the first and second plate packs have a common shell side in the plate heat exchanger arrangement (1) for a heat exchange medium flowing inside the shell, a single heat exchange medium is configured to flow through the shell side of the plate heat exchanger arrangement (1); Plate heat exchanger configuration (1).

2. 2. The plate heat exchanger arrangement according to claim 1, further comprising a third plate pack (10), the diameter of which is defined by the outer edges of the heat exchange plates, the diameter being at least smaller than the diameter of the first plate pack (2).

3. The plate heat exchanger arrangement further comprises a third plate pack (10), the diameter of which is defined by the outer edges of the heat exchange plates, and which is smaller than the diameters of the first plate pack (2) and the second plate pack (3).

3. A plate heat exchanger arrangement according to claim 1 or 2.

4. 4. A plate heat exchanger arrangement according to claim 2 or 3, characterized in that the first plate pack, the second plate pack and the third plate pack are arranged next to each other inside the same common outer casing.

5. The plate heat exchanger arrangement according to any one of claims 2 to 4, characterized in that the plate heat exchanger arrangement comprises a second partition plate (11) arranged between the third plate pack (10) and the plate pack arranged adjacent to each other.

6. The inlet and / or outlet connections (6a, 6b) of the first plate pack (2) are arranged outside the outer surface of the second plate pack (3), A plate heat exchanger arrangement according to any one of claims 1 to 5.

7. The inlet and / or outlet connection parts (7a, 7b) of the second plate pack (3) are arranged outside the outer surface of the third plate pack (10). A plate heat exchanger arrangement according to any one of claims 2 to 6.

8. 8. A plate heat exchanger arrangement according to any one of claims 1 to 7, characterized in that the inlet and outlet connections (6a, 6b, 7a, 7b, 12a, 12b) of the plate pack (2, 3, 10) comprise connecting pipes arranged in a nested manner, the outer diameter of the inlet connecting pipes being smaller than the diameter of the outlet connecting pipes and of the flow channels of the plate pack.

9. 9. A modular construction comprising at least two modules arranged inside the same outer casing and separated from one another by a partition wall, characterized in that at least one module is formed with a plate heat exchanger arrangement according to any one of claims 1 to 8.

10. 10. The modular structure of claim 9, wherein the outer casing of the module is continuous within the length of the modular structure.

11. 11. A modular structure according to claim 9 or 10, characterized in that the partition between the plate heat exchanger arrangement and the adjacent module is an end plate (5a) of the outer casing of the plate heat exchanger arrangement (1).

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