Counterflow plate heat exchanger module and counterflow plate heat exchanger

Abstract

The invention proposes a counterflow plate heat exchanger module (1) with individual plates (2) which are assembled to form a plate stack (3), wherein a flow channel for a first gaseous medium or for a second gaseous medium is formed alternately between two adjacent individual plates (2) in the vertical direction of the plate stack (3), wherein at least one spacer (4, 5) is arranged between adjacent individual plates (2) of the plate stack (3), wherein the individual plates (2) each have different materials in the longitudinal direction (18), wherein the individual plates (2) each have a first plate section (16) made of a first material and a second plate section (17) made of a second material, wherein the second plate section (17) is arranged downstream of the first plate section (16) in the flow direction (20) of a medium that condenses upon cooling.and wherein the second plate section (17) is made of a corrosion-resistant stainless steel.

Description

[0001] The invention relates to a counterflow plate heat exchanger module with individual plates assembled to form a plate stack, wherein a flow channel for a first gaseous medium or for a second gaseous medium is formed alternatingly between two adjacent individual plates in the vertical direction of the plate stack, wherein at least one spacer is arranged between adjacent individual plates of the plate stack, wherein the individual plates each comprise different materials in the longitudinal direction. Such a module is known from DE 20 2019 104 813U1. The invention further relates to a counterflow plate heat exchanger.

[0002] Plate heat exchangers are well known in the art, so a separate written reference is unnecessary here. Reference is therefore made, merely as an example, to DE 1 501 586 A1, which discloses a heat exchanger in which corrugated plates can be laminated together using edge spacer strips. In a composite of alternating plates and a flat back plate, spacer strips are inserted between edge sections of the plates. The spacer strips are straight and run the entire length of both sides of the two plates. At locations where lateral inlet and outlet openings are provided, the spacer strips are shaped like an "L."

[0003] Plate heat exchangers that operate in crossflow are known. Plate heat exchangers that operate in counterflow are also known.

[0004] Crossflow plate heat exchangers have the advantage of being relatively easy to adapt to individual requirements. In particular, the plate sizes and spacing of such a heat exchanger can be varied. This allows the material temperature of the heat exchanger to be influenced, which offers advantages against corrosion. Furthermore, even particle-laden gases can flow relatively easily through a heat exchanger with a comparatively large plate spacing.

[0005] However, cross-flow plate heat exchangers are limited in their efficiency. Furthermore, such heat exchangers cannot be operated effectively at comparatively high flow rates.

[0006] Counterflow plate heat exchangers, on the other hand, exhibit comparatively high efficiency and can effectively handle comparatively large volume flows. However, due to their design, they cannot be customized to individual requirements. Instead, they are generally only built and offered in standardized versions. Therefore, it frequently happens that customers have to order counterflow plate heat exchangers whose maximum performance is not required or which do not optimally utilize the available installation space.

[0007] There is therefore a vital economic interest in providing a heat exchanger that can be adapted to individual requirements and, moreover, can implement comparatively large volume flows with high efficiency.

[0008] The invention is therefore based on TaskThe aim is to provide a heat exchanger that is improved in terms of its customizability and efficiency compared to the state of the art, while at the same time reducing manufacturing costs.

[0009] To Solution To achieve this object, the invention proposes a counterflow plate heat exchanger module of the type mentioned at the outset, which is characterized in that the individual plates each have a first plate section made of a first material and a second plate section made of a second material, wherein the second plate section is arranged downstream of the first plate section in the flow direction of a medium which condenses upon cooling, and wherein the second plate section is formed from a corrosion-resistant stainless steel.

[0010] Furthermore, the invention proposes Solution The object is to provide a counterflow plate heat exchanger with at least one counterflow plate heat exchanger module according to the invention.

[0011] The spacers keep the individual plates spaced apart from one another. "Height direction" in the context of the invention refers to the direction in which the individual plates are stacked to form the plate stack. The spacing between the individual plates can essentially be freely selected using the spacers. The size of the spacers is also freely selectable. The counterflow plate heat exchanger module, and thus also the counterflow plate heat exchanger, can be customized with regard to the required performance by adjusting the plate spacing using the spacers. Furthermore, due to counterflow operation, a high level of efficiency is achieved. Furthermore, the counterflow plate heat exchanger according to the invention can essentially be adapted to any volume flow rate due to its modular design comprising counterflow plate heat exchanger modules according to the invention.The lower the volume flow to be processed, the fewer modules are required, and the higher the volume flow, the more modules the heat exchanger according to the invention can be constructed from. Retrofitting existing counterflow plate heat exchangers according to the invention with additional modules is also possible.

[0012] The distance between two adjacent individual plates can be adjusted using the spacers. Preferably, a distance between 5 mm and 30 mm can be adjusted. In the plate stack, each individual plate, with the exception of the two outermost individual plates, has an immediately adjacent individual plate on each of its flat sides. The aforementioned individual plates therefore each delimit a flow channel for the first medium with one of their two flat sides and a flow channel for the second medium with the other of the two sides. It is preferably provided that at least some of the individual plates, in particular all individual plates except for the two outermost individual plates, have a different distance from their two adjacent individual plates. In this respect, the flow channels for the first medium have a different flow cross-section than the flow channels for the second medium.In this context, it is particularly preferred to arrange the individual plates, which form flow channels for the first medium between them, at a distance of between 5 mm and 30 mm from one another. It is further preferred to arrange the individual plates, which form flow channels for the second medium between them, at a distance of between 5 mm and 30 mm from one another.

[0013] The individual panels are preferably rectangular in shape. They have two opposite short sides and two opposite long sides. The individual panels are aligned in the panel stack so that the long and short sides run parallel to each other.

[0014] According to the invention, the individual plates each comprise a first plate section made of a first material and a second plate section made of a second material. The second plate section is arranged downstream of the first plate section in the flow direction of a medium that condenses upon cooling. According to the invention, this second plate section is made of a corrosion-resistant stainless steel.

[0015] In typical use cases, one of the two media condenses upon cooling. This could be water vapor, for example. However, other gaseous media, such as flue gases, can also lead to the formation of condensate upon cooling, which then condenses on the individual plates.

[0016] Typically, such condensate does not form immediately upon the medium entering the counterflow plate heat exchanger module, but only after it has traveled a certain flow path within the module. In this respect, the flow path can be functionally divided into a non-condensation zone on the one hand and a condensation zone on the other.

[0017] According to the invention, the individual plates comprise a first plate section made of a first material and a second plate section made of a second material. This makes it possible to provide the second plate section for the condensation area and to select a corrosion-resistant stainless steel as the material for this plate section. This advantageously ensures that a material resistant to condensate is used in the condensation area, thus ensuring longevity.

[0018] The first plate section, located outside the condensation zone, does not need to be made of corrosion-resistant stainless steel, because condensate does not yet form in this area. This makes it possible to choose a much more cost-effective material for the first plate section than corrosion-resistant stainless steel. This results in significant material savings, making production more cost-effective and thus more economical.

[0019] Investigations by the applicant have shown that up to 40% of material costs can be saved if a single plate is not made entirely of corrosion-resistant stainless steel, but is formed in the manner according to the invention from two plate sections each made of different materials.

[0020] As an alternative to the different material design of an individual plate, it could also be provided to have two modules, each made of a different material, arranged one after the other in the direction of flow. However, such a design would have the disadvantage of resulting in flow losses, particularly pressure losses, in the transition area between the individual modules. Therefore, according to the invention, it is not provided to have two modules made of different materials arranged one after the other, but rather to form the individual plates of a module from different materials in accordance with the design according to the invention.This avoids undesirable pressure losses while simultaneously reducing material costs, whereby the design according to the invention synergistically not only reduces manufacturing costs but also enables a flow pattern free of pressure losses in the transition area between the two plate sections.

[0021] The result of the inventive design is that only the area of ​​an individual plate is made of corrosion-resistant stainless steel where condensate forms during intended use. The area upstream of this area in the flow direction can be made of a more cost-effective material than corrosion-resistant stainless steel, since condensate does not form in this area, thus eliminating the need for a corrosion-resistant design in this area.

[0022] According to a further feature of the invention, it is provided that the second plate section is formed from a high-alloy stainless steel, preferably an austenitic stainless steel, in particular 1.4539 or higher alloyed.

[0023] The corrosion-resistant stainless steel is preferably a high-alloy stainless steel. This can preferably be an austenitic stainless steel, for example, type 1.4539 stainless steel. This type of stainless steel is characterized by its high corrosion resistance and is therefore suitable as a material for the second plate section.

[0024] According to a further feature of the invention, the first plate section is formed from a low-alloy stainless steel, preferably of type 1.4301. Such a stainless steel is comparatively inexpensive, particularly compared to a high-alloy stainless steel such as that used to form the second plate section. As a result, significantly reduced manufacturing costs can be achieved compared to forming the entire individual plate from a high-alloy stainless steel. Both the low-alloy stainless steel of the first plate section and the high-alloy stainless steel of the second plate section can be processed, in particular welded, using conventional methods and devices.

[0025] According to a further feature of the invention, the two plate sections are connected to one another without any protrusions, preferably by welding. This protrusion-free connection of the two plate sections ensures that no unwanted pressure losses occur if flow overflows the connection area between the first plate section and the second plate section. The protrusion-free connection is easily achieved by welding the two plate sections together. This can be done, for example, using laser welding. The two plate sections are placed face-to-face and then welded together.If necessary, the connecting area between the first and second plate sections can then be reworked, for example by grinding, so that a flat, protrusion-free transition between the first plate section and the second plate section is ensured.

[0026] According to a further feature of the invention, it is provided that the first plate section has an extension in the longitudinal direction of the individual plate of 30% to 70%, preferably of 50% of the total longitudinal extension of the individual plate.

[0027] The longitudinal extent of a plate section depends primarily on its later application, i.e. the media to be conducted through the heat exchanger. When selecting the longitudinal extent of the first plate section, particular attention must be paid to ensuring that no condensate forms in this area during normal use. Typically, the longitudinal extent of the first plate section can be selected to be 50% of the total longitudinal extent of an individual plate. In this case, the first plate section and the second plate section are therefore the same length. Depending on the intended use, the first plate section can also be selected to be shorter or longer. It is crucial that the longitudinal extent ratio of the first plate section to the second plate section is selected so that condensate forms exclusively in the second plate section.The extension of the first plate section should be as long as possible so that maximum cost savings are achieved.

[0028] According to a preferred feature of the invention, the individual plates, particularly in the area of ​​the flow channels, are designed without embossing. This simplifies the manufacturing process, as complex embossing and the associated embossing machines are eliminated. Furthermore, the spacers make it possible to use not only completely embossed individual plates, but even completely flat individual plates. Preferably, individual plates with standardized sizes are used, which are then ready for immediate use and can be assembled into a plate stack.

[0029] According to a preferred feature of the invention, the individual plates can be designed with variable dimensions. This allows the counterflow plate heat exchanger to be further customized. In particular, it is provided that the individual plates have a thickness between 0.8 mm and 6 mm, preferably between 1 mm and 3 mm. This allows the corrosion resistance and mechanical stability of the heat exchanger to be adjusted. Furthermore, it is provided that the individual plates have a width between 1000 mm and 2000 mm. This is particularly advantageous compared to counterflow plate heat exchangers known from the prior art, since their width is fixed.

[0030] In principle, the individual panels can be of any length. However, for practical reasons, it is preferred that the individual panels have a length of 1 m to 10 m, preferably 1 m to 4 m, more preferably 2 m to 3.5 m, and most preferably 3 m.

[0031] Heat exchangers with modules constructed from individual plates of the same width are preferred. However, heat exchangers with modules made from plates of different widths can also be constructed. This allows the heat exchanger to be more flexibly adapted to the given installation space. This depends on the individual requirements of the heat exchanger according to the invention.

[0032] According to a preferred feature of the invention, at least one spacer is designed as an elongated, rectangular profile. It can be designed in the form of a rectangular frame. The spacers are preferably arranged in the edge regions of the long sides of the respective individual panels. Preferably, two spacers are arranged between each two adjacent individual panels. The two spacers are arranged in opposite edge regions of the individual panels. They run parallel to each other along the long sides of the individual panels.

[0033] The areas extending between the short sides of adjacent individual plates arranged one above the other in the vertical direction of the plate stack are open. In particular, they are designed without spacers. This allows inlets and outlets of the flow channels for the first and second medium to be formed on the short sides. The respective openings of the inlets and outlets can be adapted, particularly with regard to flow cross-section and position, to individual requirements such as pressure loss, accessibility, and the like.

[0034] It is preferred that the cross-section of a spacer formed as a profile be substantially rectangular. A solid profile is preferred. The spacers are preferably connected to the individual plates in a gas-tight manner. The spacers thus seal the flow channels laterally in a gas-tight manner. The spacers form the respective side walls of the flow channels.

[0035] It is further preferred that the spacer be L-shaped when viewed from above. When positioned as intended between the individual panels, it thus forms part of a frame. In this case, the frame part extends along the long side of the individual panels and at least part of the short side of the individual panels. This particularly improves mechanical stability. The L-shaped spacer is preferably formed from two spacers that are connected to each other at right angles, preferably welded, and are rectangular when viewed from above.

[0036] According to a preferred feature of the invention, at least one spacer is designed as a separate component. Preferably, several, in particular all, spacers are designed as separate components. Preferably, the spacer(s) is / are welded to the individual plates. In particular, the connecting surfaces are welded to the individual plates. According to a preferred feature of the invention, only one, in particular a single, spacer is arranged, which is formed as a separate component, between the, in particular each, short sides of adjacent individual plates. It is preferred, however, to use spacers made of different materials, corresponding to the materials used for the plate sections of an individual plate. Accordingly, the material used for spacers in the region of the second plate section is preferably the same material from which the second plate section is also formed.Accordingly, the spacers in the area of ​​the first plate sections are made of the same material as the first plate sections. This also allows for a further reduction in manufacturing costs.

[0037] According to a further feature of the invention, at least one spacer is formed integrally with at least one of the individual plates. The spacer is preferably formed by bending an edge section of the individual plate. The free end of the spacer is integrally connected, preferably welded, to an immediately adjacent further individual plate to form the plate stack. This advantageously eliminates a weld seam. This leads to a reduction in production costs and to an improvement in the mechanical stability, particularly with regard to corrosion, of the plate heat exchanger. The spacer is preferably formed by bending a corresponding edge section of each of two adjacent individual plates towards the other edge section.The bent edge section of one individual plate is connected, in particular welded, to an edge section of the other individual plate. According to a particularly preferred feature of the invention, a spacer formed by bending is arranged only between the long sides of adjacent individual plates, in particular between each long side. In accordance with the embodiment according to the invention, an individual plate consists of two plate sections made of different materials. Accordingly, the plate sections are first manufactured and then joined together to form a single plate. The edge of the individual plate is then folded to form the spacers, thus producing not only plate sections made of different materials, but also spacers made of corresponding materials.

[0038] According to a preferred feature of the invention, additional spacers, in particular in the form of studs, are arranged between individual plates. The additional spacers serve to ensure consistent plate spacing across at least part of the flow channel. In principle, the spacers arranged in the edge region are already sufficient for this purpose. However, if comparatively large individual plates are used, it may be advantageous to provide the aforementioned additional spacers. Preferably, the additional spacers, in particular the studs, are welded onto at least one of the individual plates. This nevertheless allows the individual plates to be designed completely free of embossing, as preferably provided. A stud field is preferably formed by a plurality of studs arranged at regular intervals from one another and distributed across the flow channel.The stud array advantageously contributes to improving the dimensional stability of the heat exchanger. The height of the studs can be adjusted to the desired spacing between the individual plates. The studs are preferably made of the same material as the plate section that supports them. Accordingly, studs for a second plate section are preferably made of a high-alloy stainless steel, whereas studs for a first plate section are made of a low-alloy stainless steel.

[0039] According to a preferred feature of the invention, at least one reinforcing element is arranged between two individual plates. It is preferably arranged in the flow channel along at least one of the long sides. The reinforcing element preferably extends from one of the individual plates to the immediately adjacent individual plate. It is preferably integrally connected, in particular welded, to the first individual plate at one end. The other end of the reinforcing element is preferably integrally connected, in particular welded, to the second individual plate. The reinforcing element is preferably made of a weldable material, in particular metal, preferably steel. To increase mechanical stability, the reinforcing element is designed in the style of a "comb" with a comb-like contour.It has an elongated web and prongs extending away from this web at an angle, in particular a right angle. The web is arranged such that it extends parallel to the long sides of the individual plates. Its side facing away from the prongs is connected, in particular welded, to the first individual plate. The free ends of the prongs, in contrast, are connected, in particular welded, to the second individual plate. A reinforcing element preferably consists of the material of the plate section to which the reinforcing element is connected. Preferably, a reinforcing element is divided into two sections corresponding to the plate design, which sections are welded together. The sections of the connecting element consist of the same materials from which the plate sections of the individual plate are formed, to which the connecting element is connected in the finally assembled state.This material design also serves to improve corrosion protection on the one hand and to reduce production costs on the other.

[0040] The reinforcement element can extend over the entire length of the flow channel or only over a specific section. The length of the section can be freely selected. Preferably, the reinforcement element extends over the entire length of the flow channel.

[0041] It may preferably be provided that at least one reinforcing element is arranged in the edge region of the adjacent individual panels. It can be connected, in particular welded, at least in sections to the spacer running along the long side.

[0042] According to a preferred feature of the invention, the long sides of the counterflow plate heat exchanger are provided with a cover. The cover covers the connection points, in particular weld seams, between the spacers and the individual plates. This serves, on the one hand, to protect the weld seams from corrosion. On the other hand, it creates an additional diffusion barrier, which prevents the media from escaping via the long sides of the counterflow plate heat exchanger. The cover is preferably formed from a sheet, in particular sheet steel. The cover is preferably integrally connected, in particular welded, to the individual plates and / or spacers.

[0043] According to the invention, the counterflow plate heat exchanger comprises at least one counterflow plate heat exchanger module according to the invention. This may be sufficient for simple applications, since the modules themselves can be customized by selecting the dimensions of the individual plates and the plate spacing.

[0044] However, in the range of high volume flows, it is preferably provided that the counterflow plate heat exchanger according to the invention comprises a plurality of counterflow plate heat exchanger modules. In this case, the modules are arranged one above the other and / or next to each other in such a way that the long sides of the individual plates run parallel to each other.

[0045] It is further preferably provided that the individual counterflow plate heat exchanger modules have different dimensions, in particular with regard to the thickness of the individual plates, the width of the individual plates, the length of the individual plates, and / or the spacing between the individual plates. This allows the heat exchanger according to the invention to be further adapted to the spatial and process-related conditions, thereby allowing for further optimized use of the available installation space.

[0046] The invention is explained below using an embodiment which is not intended to be limiting for the person skilled in the art. Fig. 1 shows a counterflow plate heat exchanger module according to the invention in a schematic representation in a perspective view and Fig. 2 shows a schematic plan view of an individual plate of a module according to the invention.

[0047] Figure 1shows a counterflow plate heat exchanger module 1. This has a plate stack 3 assembled from individual plates 2.

[0048] Adjacent individual plates 2 are each arranged at a distance from one another with the interposition of two spacers 4, 5 and with the formation of flow channels for a first medium and for a second medium.

[0049] The first medium flows through the respective flow channel in flow direction A. The second medium, on the other hand, flows through the flow channel in flow direction B which is formed between the flow channels for the first medium.

[0050] The disk stack 3 carries 2 separating elements 6 in the area of ​​the short sides of the individual disks. One separating element 6, 7 is arranged on each of the opposite short sides of the disk stack 3. The separating elements 6, 7 extend over the entire height of the disk stack 3 in the stacking direction to keep the two media separate from each other.

[0051] A separating element 6, 7 each divides a short side of the plate stack 3 into an inflow section 8 and an outflow section 9 for the second medium, and an inflow section 10 and an outflow section 11 for the first medium. In the present case, two inlet openings 12 for the flow channels of the second medium are formed in the inflow section 8 delimited by the separating element 6. The flow channel for the first medium, which runs between the flow channels for the second medium, is sealed gas-tight in the region 13 between the two inlet openings 9. In the present case, an outlet opening 14 for the flow channel of the first medium is formed in the outflow section 11 delimited by the separating element 6. The flow channels for the second medium, which run at a distance from one another with the flow channel for the first medium interposed, are each sealed gas-tight in the region 15 adjacent to the outlet opening 14.The inflow / outflow sections 10, 9, defined by the separating element 7, are formed corresponding to the inflow / outflow sections 8, 11. This ensures that the flow channels can be flowed through via the two inlet openings and the outlet opening for the first and second medium, respectively, but mixing of the first and second medium is excluded.

[0052] The spacers 4, 5 form the side walls of the respective flow channels.

[0053] They seal them gas-tight along the long sides of the individual plates 2.

[0054] The spacers 4, 5 are designed as solid profiles with a rectangular cross-section. When viewed from above, the solid profiles are essentially L-shaped. The two sides of the profile are each welded to one of the adjacent individual plates 2.

[0055] The individual plates 2 are designed completely free of embossing and with a completely flat surface. This improves the flow characteristics within the plate stack 3. The possibility of designing the individual plates 2 in this way is only made possible by the spacers 4, 5 according to the invention, which ensure the necessary mechanical stability of the plate stack 3 even without embossing.

[0056] The individual panels are arranged equidistant from each other with a spacing of 6 mm. They have a thickness of 1 mm. Furthermore, the individual panels are 1000 mm wide and 2 m long.

[0057] Fig. 2shows a schematic plan view of a single plate 2 according to the invention. This plate has two plate sections, namely a first plate section 16 and a second plate section 17, which are arranged one after the other in the longitudinal direction 18. The second plate section 17 is arranged downstream of the first plate section 16 in the flow direction 20 of a medium that condenses upon cooling. During normal operation, the medium therefore first passes through the first plate section 16 in the flow direction 20 before reaching the second plate section 17.

[0058] The two plate sections 16 and 17 are each made of different materials. The second plate section 17 is made of a corrosion-resistant stainless steel, for example, an austenitic stainless steel. In particular, a stainless steel with the type designation 1.4539 can be used.

[0059] In contrast to the second plate section 17, the first plate section 16 is made of a low-alloy stainless steel, for example a stainless steel with the type designation 1.4301.

[0060] The low-alloy stainless steel of the first plate section 16 is much cheaper than the high-alloy stainless steel of the second plate section 17, so that the individual plate 2 is overall much more cost-effective to manufacture, in contrast to an individual plate 2 which is made entirely of a high-alloy stainless steel.

[0061] The second plate section 17 has a longitudinal extension in the longitudinal direction 18, which, in its intended use, corresponds to the subsequent condensation area. Accordingly, high-alloy stainless steel is used only in the area of ​​the individual plate 2 where condensation occurs in its intended use. The area in which no condensation occurs in its intended use corresponds to the first plate section, which is why it does not need to be made of high-alloy stainless steel.

[0062] The two plate sections 16 and 17 are connected to each other without any protrusions, for example by welding. Therefore, a weld seam 19 extends between the two plate sections 16 and 17.

[0063] To produce the single plate 2, the two plate sections 16 and 17 must first be formed. These are then placed face-to-face and joined by welding. Subsequently, post-processing can take place, for example, by grinding, so that an overall single plate 2 with a flat surface configuration is created. This advantageously prevents undesirable flow losses in the transition area between the first plate section 16 and the second plate section 17. Reference symbol

[0064] 1 Counterflow plate heat exchanger module 2 Single plate 3 Plate stack 4 Spacer 5 Spacer 6 Separator 7 Separator 8 Inflow section 9 Outflow section 10 Inflow section 11 Outflow section 12 Inlet opening 13 Sealed area 14 Outlet opening 15 Sealed area 16 First plate section 17 Second plate section 18 Longitudinal direction 19 Weld seam 20 Flow direction

Claims

1. Counterflow plate heat exchanger module comprising individual plates (2) which are joined together to form a plate stack (3), wherein a flow channel for a first gaseous medium or for a second gaseous medium is formed alternately between two adjacent individual plates (2) in the height direction of the plate stack (3), wherein at least one spacer (4, 5) is arranged between adjacent individual plates (2) of the plate stack (3), wherein the individual plates (2) each comprise different materials in the longitudinal direction (18), characterized in that the individual plates (2) each comprise a first plate section (16) made of a first material and a second plate section (17) made of a second material, wherein the second plate section (17) is arranged downstream of the first plate section (16) in the flow direction (20) of a medium condensing during cooling, and wherein the second plate section (16) is made of corrosion-resistant stainless steel.

2. Counterflow plate heat exchanger module according to claim 1, characterized in that the first plate section (16) is made of a low-alloy stainless steel, preferably 1:4301.

3. Counterflow plate heat exchanger module according to claim 1 or 2, characterized in that the second plate section (17) is made of a high-alloy stainless steel, preferably an austenitic stainless steel, in particular 1:4539 or higher alloyed.

4. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the plate sections (16, 17) are connected to one another without projections, preferably by welding.

5. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the first plate section (16) has an extension in the longitudinal direction (18) of the individual plate (2) of 30% to 70%, preferably 50% of the total longitudinal extension of the individual plate (2).

6. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that at least some of the individual plates (2) are completely free of embossing, in particular completely flat.

7. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the distance between two individual plates (2) is between 5 mm and 30 mm.

8. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the spacers (4, 5) are arranged in the edge regions of the respective individual plates (2) along the long sides of the individual plates (2).

9. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the spacers (4, 5) seal the flow channels laterally in a gas-tight manner.

10. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that at least part of the spacers (4, 5) is welded to the individual plates.

11. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the individual plates (2) have a thickness between 0.8 mm and 6 mm.

12. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the individual plates (2) have a width between 1000 mm and 2000 mm.

13. Counterflow plate heat exchanger module according to any of the preceding claims, characterized in that the individual plates (2) have any length, preferably a length of at least 1 m to 10 m, more preferably 1 m to 4 m.

14. Counterflow plate heat exchanger comprising at least one counterflow plate heat exchanger module (1) according to any of the preceding claims 1 to 13.

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