WO2019141513A1

WO2019141513A1 - Swirling device for a plate heat exchanger and plate heat exchanger

Info

Publication number: WO2019141513A1
Application number: PCT/EP2019/025020
Authority: WO
Inventors: Manfred Steinbauer; Axel Lehmacher; Alexander WOITALKA
Original assignee: Linde Aktiengesellschaft
Priority date: 2018-01-22
Filing date: 2019-01-21
Publication date: 2019-07-25

Abstract

The invention relates to a swirling device (10) for a plate heat exchanger (1). The swirling device (10) has a swirling protrusion (14) and can be mounted on the plate heat exchanger in such a way that the swirling protrusion (14) is arranged in and/or at a flow channel (22) of the plate heat exchanger. The swirling protrusion (14) is designed to swirl a fluid flowing into the flow channel (22) in such a way that, downstream, the fluid flows completely through the same flow channel (22) while performing at least one swirling motion. The invention further relates to a plate heat exchanger.

Description

description

Swirling machine for a plate heat exchanger and

Plattenwärmeübertraaer

The invention relates to a swirling device for a heat exchanger or heat exchanger, as well as a heat exchanger. The invention is thus

in particular in the technical field of process engineering, in particular of heat exchangers, such as plate heat exchangers.

Vacuum brazed plate heat exchangers are known in the art (plate fin heat exchanger, PFHE), which have various technical advantages, such as an advantageous compactness and / or heat integration and / or inexpensive to produce. Such heat exchangers generally generally have a plurality of flow channels, which from a fluid to

Transfer heat to be flowed through. The plurality of flow channels can be structurally separated from one another, for example, by means of separating plates or separating sheets ("seperator plates", "parting sheets"). In each case a fin (English: "fin") is arranged between two adjacent partition plates, so that a plurality of parallel channels is formed between adjacent plates, which can be flowed through by a medium. To the sides of the slats are bounded by so-called sidebars (edge strips), which are soldered to the adjacent plates. In this way, a plurality of parallel heat transfer passages are formed so that media e.g. can be passed in countercurrent to each other to perform an indirect heat exchange.

By a suitable design of the slats, the heat transfer of the fluid flowing through the flow channels can additionally be influenced by the heat exchanger and / or another fluid which is in contact with the heat exchanger. In particular, the slats to an advantageous

Have surface structuring. For example, smooth and / or perforated and / or cut slats can be used and thus the heat transfer properties of the heat exchanger can be influenced in a targeted manner. Also "herringbone" lamellae are known, which are provided with a reminiscent of herringbone surface texturing. The lamellae are particularly useful for the improvement of the heat exchanger, since they increase the thermal contact area between the flow channel or the heat exchanger and the fluid flowing through the heat exchanger and thus adapting the heat exchanger to the respective

Enable requirements. For example, this can be a lesser

Heat transfer between fluid and wall can be increased, as is the case for example with low pressure gas streams.

However, the use of fins, particularly cut fins, also has the disadvantage that they typically significantly increase a pressure drop in the fluid flowing through the heat exchanger, the pressure loss typically being significant as the thermal expansion increases

Contact area increases.

The invention is therefore based on the object to provide and / or adapt a plate heat exchanger such that the efficiency of the plate heat exchanger can be increased without, however, to the same extent causing a concomitant pressure loss.

Disclosure of the invention

This object is achieved by a swirling device for a

Plate heat exchanger and a plate heat exchanger with the

Characteristics of the respective independent claims. preferred

Embodiments are subject of the dependent claims, as well as the following description.

In a first aspect, the invention relates to a swirling device for a plate heat exchanger, wherein the swirling device a

Having Verwirbelungsvorprung and is attachable to the plate heat exchanger such that the Verwirbelungsvorprung in and / or on a

Flow channel of the plate heat exchanger is arranged. It is the

Verwirbelungsvorprung trained to a flowing into the flow channel Fluid to fluidize such that the fluid while performing at least one

Whirling downstream flows completely through the same flow channel.

In a further aspect, the invention relates to a plate heat exchanger, which has at least one swirling device according to the invention. The

Vortexing device may preferably be attached to the plate heat exchanger and / or integrated into the plate heat exchanger.

In a further aspect, the invention relates to a plate heat exchanger having a flow channel, which is designed to be flowed through by a fluid in a flow direction downstream, as well as a

A swirl projection disposed in the flow channel and / or upstream of the flow channel and configured to swirl at least a portion of the fluid flowing over the swirl projection such that the fluid flows completely through the same flow channel downstream by performing at least one preferably spiral swirl movement downstream.

That the swirl projection in and / or on a flow channel of the

Plate heat exchanger is arranged, means that the

Verwirbelungsvorsprung can be formed within the flow channel, i. in an interior of the flow channel, which of a fluid to

Heat transfer can be flowed through, and / or outside of the

Flow channel can be arranged on the plate heat exchanger. If the swirl projection on the flow channel, i. outside the

Flow channel is arranged, it may be advantageous if it is arranged at a fluid inlet of the plate heat exchanger, through which the fluid can flow into the flow channel.

The fact that the fluid flows downstream through the flow channel while carrying out at least one spiral vortex movement means that the fluid does not only move in a straight line through the flow channel, but also has a component of movement which is perpendicular to a longitudinal axis of the flow channel which passes through the preferred flow direction the

Flow channel pretends extends. The fact that the fluid flows completely through the entire flow channel while carrying out at least one vortex movement downstream means in particular that the entire fluid flowing through the flow channel while carrying out the at least one vortex movement flows through one and the same flow channel. In other words, the heat exchanger and / or the swirling device is designed such that the entire flowing through the flow channel fluid or the fluid added in a vortex flow continues to flow through the flow channel, but not by the swirling device and / or through the

Verwirbelungsvorsprung and / or by the vortex movement itself from the

Flow channel is led out. In other words, that changes

Swirling device and / or the Verwirbelungsvorsprung and / or the

Vortex movement does not mind that the fluid flowing through the flow channel continues to flow through the flow channel until the fluid reaches the outlet of the flow channel. Preferably, the swirling device and / or the swirling protrusion and / or the swirling motion does not cause the fluid flowing through the flow channel to prematurely, i. before reaching the regular outlet of the flow channel, is led out of the flow channel and / or escaped. Preferably, therefore, the swirling device and / or the swirling protrusion are designed such that they have no openings and / or recesses and / or passages in the boundaries of the

Have flow channels, which lead out of the fluid from the

Flow channel would allow. This offers the advantage that no redistribution of the fluid flowing through one or more channels takes place and thus a fluid flowing in a certain flow channel also comes out of the fluid again

Flow channel flows out at the outlet.

The invention offers the advantage that no redistribution of the fluid in the

Plate heat exchanger due to the swirling device or the

Verwirbelungsvorsprungs or the vortex movement takes place and therefore the

Plate heat exchangers can continue to perform its function.

The invention also offers the advantage that the heat transfer from the fluid to the plate heat exchanger or vice versa can be improved without increasing the thermal contact surface by the fluid vortex movement caused by the flow channel. Thus, by the invention the realization of plate heat exchangers are made possible, which allow a high degree of heat transfer and yet can be made compact.

Furthermore, the invention offers the advantage that the heat transfer from the fluid to the plate heat exchanger or vice versa can be increased without necessarily to the same extent a pressure drop of the by the

Plate heat exchanger flowing fluid occurs. In particular, the invention allows to realize a heat transfer with efficient plate heat exchanger even with such lamellae, which cause a small pressure loss (compared to other lamellae, such as cut lamellae), however

conventionally also cause a lower heat transfer. By providing a plate heat exchanger with fins which have a low heat transfer, such as smooth and / or perforated fins with large pitch, and with a swirling device according to the invention, the heat transfer can be significantly increased without significantly increasing the pressure loss, as for example the use of cut slats would be the case. Thus, the invention is particularly advantageous for the heat transfer of low-pressure fluids, such as low-pressure gas streams, in which a large pressure loss or a significant reduction of the outlet pressure at the outlet of the plate heat exchanger can be particularly disadvantageous.

In other words, the invention offers the possibility to realize a plate heat exchanger with a high heat transfer coefficient while still minimizing the pressure loss occurring. Another advantage of the invention is that it can realize a plate heat exchanger with particularly good effective performance parameter (English: Effective Performance Parameter, EPP), wherein the effective performance parameter by a ratio of

Heat transfer increase and the pressure loss is defined. The effective one

Performance parameter EEP is given by the following mathematical relationship:

wherein Nu _yy the heat transfer of a heat exchanger with

_{Verwirbelungsvorrichtung} , Nu _oVV the heat transfer of a heat exchanger without swirling _device , D Pu _vv the pressure drop in a heat exchanger with swirling device and APU _{oVV represent} the pressure loss in a heat exchanger without swirling _device .

Preferably, the swirling device has a plurality of swirling projections, which are designed to swirl a fluid flowing into the flow channel. The plurality of swirling projections can be arranged side by side, in particular perpendicular to the longitudinal axis of the flow channel and overlap with a cross-sectional area of a single flow channel. This offers the advantage that the degree of turbulence or an extent of the swirling movement of the fluid flowing through the flow channel can be increased. Particularly preferably, the swirl projection forms a ramp which increases along the direction of flow relative to the flow channel.

Alternatively or additionally, the swirling device may preferably have a plurality of swirling projections and be attachable to a plate heat exchanger in such a way that the plurality of swirling protrusions are connected to a plurality of swirling protrusions

Flow channels of the plate heat exchanger are arranged. In this case, for example, a single swirling projection can be arranged on each flow channel and / or a plurality of channels can be arranged on each flow channel

Verwirbelungsvorsprünge be arranged. This offers the advantage that at least one swirling movement of the fluid flowing through the respective flow channels can be caused in several or even all flow channels of a plate heat exchanger. Preferably, therefore, the plate heat exchanger on a plurality of flow channels, wherein at least a portion of the flow channels each having at least one Verwirbelungsvorsprung. These swirling projections can be arranged side by side.

Alternatively or additionally, a plurality of swirling projections can be arranged behind one another in a flow channel. In other words, therefore, the at least one flow channel preferably has a plurality of swirling projections, wherein the plurality of swirling protrusions in the at least one flow channel are arranged downstream successively. As a result, for example, a longitudinal extent and / or a duration of the swirling movement of the fluid flowing through the flow channel can be increased or extended, and thus the heat transfer along the longitudinal axis of the flow channel can be increased. Particularly preferably, the plurality can be arranged one behind the other

Verwirbelungsvorsprünge be arranged such that they cause and / or maintain a spiral movement of the fluid flowing through the flow channel and thus allow a particularly efficient heat transfer over preferably the entire length of the flow channel.

Preferably, the swirling device is designed to be arranged and / or fastened to a fluid inlet of the plate heat exchanger. This offers the advantage that a vortex movement is already caused before and / or at the entrance of the fluid into the flow channel or into the heat exchanger, and thus a high heat transfer coefficient can be achieved at the beginning of the heat transfer.

The plate heat exchanger preferably has at least one lamella. This offers the advantage that the heat exchanger can be provided in a particularly compact and / or particularly cost-efficient manner. In this case, the lamella is particularly preferably designed such that it spatially separates at least two flow channels, in particular flow channels adjoining one another, the lamella preferably being smooth and / or perforated and / or cut. Particularly preferably, a plate heat exchanger, which has smooth and / or perforated fins, be equipped with a swirling device, as this leads to a greater heat transfer with a particularly low pressure loss of the fluid flowing through the plate heat exchanger.

The at least one lamella of the plate heat exchanger can preferably have the at least one swirling projection. The swirling projection can be designed, for example, as an integral part of the at least one lamella and / or attached thereto. Alternatively or additionally, the entire

Swirling device as a lamella and / or as a lamellar arrangement, which may for example comprise a plurality of fins, be formed. This offers the advantage that the swirling device and / or the at least one Verwirbelungsvorsprung made in a particularly simple manner and / or can be integrated into the plate heat exchanger.

Preferably, the at least one swirl projection protrudes at least 2 mm, more preferably at least 5 mm, even more preferably at least 1 cm, much more preferably at least 2 cm, most preferably at least 5 cm perpendicular to the longitudinal axis of the flow channel into the flow channel. Preferably, the at least one swirl projection extends in a direction perpendicular to the longitudinal axis of the flow channel over at least 5% of the width of the flow channel, more preferably at least 10% of the width of the flow channel, even more preferably at least 15% of the width of the flow channel, much more preferably at least 20 % of the width of the flow channel, much more preferably at least 25% of the width of the flow channel. As the width of the flow channel while the width of the inner dimensions of the flow channel is considered perpendicular to the longitudinal axis. Preferably, the at least one swirl projection extends in one

Direction perpendicular to the longitudinal axis of the flow channel over not more than 75% of the width of the flow channel, more preferably not more than 50% of the width of the flow channel, even more preferably not more than 40% of the width of the flow channel, most preferably not more as 30% of the width of the flow channel. As a result, a suitable degree of swirling of the fluid flowing over the at least one swirling projection is preferably achieved.

Further advantages and embodiments of the invention will become apparent from the

Description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically with reference to an embodiment in the drawing and will be described below with reference to the drawing.

figure description FIG. 1 shows schematically and in perspective a preferred embodiment of a plate heat exchanger according to the invention before (FIG. 1A) and after the attachment of inlet and outlet attachments (FIG. 1B).

FIG. 2 schematically shows a swirling device according to a first preferred embodiment.

FIG. 3 schematically shows a swirling device according to a second preferred embodiment.

FIG. 4 shows, in a schematic illustration, a lamination arrangement on which swirl projections are formed in a processing step.

Figures 5 and 6 each show in schematic representations

Verwirbelungsvorrichtungen which are formed as a lamellar arrangement.

FIG. 7 shows a schematic representation of a swirling device according to a further preferred embodiment.

Detailed description of the figures

FIG. 1 shows a preferred embodiment of a device according to the invention

Plate heat exchanger shown schematically and in perspective and designated 1.

The plate heat exchanger 1 according to Figure 1 A has a cuboid

Central body 8 with a length of, for example, several meters and a width or height of, for example, about one or a few meters. In essence, the central body 8 is an arrangement of alternating separating plates 9 and lamellae 2, 2a (so-called fins). The central body 8 of the

Plattenwärmeübertragers 1 thus has a plurality of partition plates and a plurality of fins, wherein in each case a blade is arranged between two adjacent partition plates. Both the dividers and the fins may be made of aluminum, for example. On their sides, the slats 2, 2a by

Sidebars 4, which can also be made of aluminum, completed, so that by the stack construction with the partition plates 9 a

Sidewall is formed. The outer slats (here 2a) of the

Central body 8 are by a parallel to the slats and the separating plates lying cover 5 (cover plate) usually also made of aluminum

completed.

To produce the plate heat exchanger 1, the usually solder-plated partitions 9, edge strips 4 and slats (here only the slats 2 and 2a

designated) in a stack to the central body 8 shown here superimposed, which is then soldered in a soldering oven under vacuum. Subsequently, the input and output of the heat exchanging fluids required inputs and

Outlet attachments 6, 6a attached, as shown in Figure 1 B.

On the top of the central body 8, on its sides and below the central body 8 can be seen in Figure 1 B essays 6 and 6a. The located below the central body 8 and on the side facing away from the side facing 6 and 6a are partially hidden.

Through nozzle 7, the plate heat exchanger 1, a fluid or process flow supplied or this be removed again. The attachments 6 and 6a serve to distribute the fluid introduced through the connecting pieces 7 or to collect and concentrate the fluid to be taken from the plate heat exchanger 1, the distribution or collection via distributor fins 3 (cf. Figure 1 A) to or from the heat exchanger fins 2, 2a takes place. Within the

Plate heat exchanger 1 then exchange the various fluid streams

Heat energy out.

The plate heat exchanger 1 shown in Figure 1 is designed to pass fluid streams in separate passages for heat exchange to each other. A part of the streams can be passed in opposite directions to each other, another part crosswise or in the same direction.

According to a preferred embodiment of the invention, the

Plate heat exchanger 1 at least one swirling device, as will be explained in more detail below. Each slat of the plate heat exchanger 1 separates Each of a plurality of flow channels from each other, which are each designed to be flowed through by a fluid downstream in a flow direction. In and / or at such flow channels is in each case a

Vortex projection of a preferred embodiment of a swirling device according to the invention arranged, wherein such a swirling protrusion is adapted to fluidize a flowing into the respective flow channel fluid such that the fluid flows while performing at least one vortex movement downstream completely through the same flow channel, as described below with respect to the figures 2 to 7 will be explained.

FIG. 2 shows a swirling device 10 according to a first preferred embodiment as well as a material strip 12 from which the

Verwirbelungsvorrichtung 10 can be produced. The strip of material 12 can be present, for example, as a flat metal, which can be shaped for example by means of a stamping process to the swirling device 10. The swirling device 10 has two swirling protrusions 14, which according to the preferred embodiment shown protrude from the plane of the previous material strip 12.

The swirling protrusions 14 serve to swirl a fluid flowing over the swirling device 10 so that the flowing fluid downstream of the swirling device 10 makes a swirling movement.

FIG. 3 shows a swirling device 10 according to a second preferred embodiment, which can be manufactured from a blank 12a. The

Verwirbelungsvorrichtung 10 according to the second preferred embodiment, in contrast to the first preferred embodiment, a frame member 16 which has a rectangular cross-section. The frame member 16 may be formed such that the swirling device 10 can be preferably arranged and secured to a heat exchanger so that the Verwirbelungsvorsprünge 14 at least partially overlap with inlet openings of a flow channel or of a plurality of flow channels of the heat exchanger. For example, the dimensions of the frame member 16 may be substantially equal to the dimensions of one side of the heat exchanger

be dimensioned at which the swirling device 10 is to be attached, and / or equal to the dimensions of an inlet opening of one or more

Flow channels. The swirling protrusions 14 can be punched out of the blank 12a, for example by means of a stamping method, so that they extend into the interior of the frame element 16 which is produced during the stamping process.

FIG. 4 shows a schematic representation of a lamination arrangement 18, on which, in one processing step, swirling projections 14 are formed in order to obtain a swirling device 10. The lamellar assembly 18 is designed as a planar component, which is folded meandering to

Partitions or fins 20 for limiting arranged between the partitions 20 channels or flow channels 22 to form. For example, the fin assembly 18 may be disposed in a surrounding frame structure (not shown) which closes the channels 22 at the top and bottom and thus form flow channels disposed between the fins 20.

In order to form the swirling device 10, the swirling projections 14 can be punched out of the slat arrangement, for example by means of a stamping process, which then extend into the cross section of the channels 22, with the fluid flowing into a channel 22 or flow channel in one To put vertebrae motion.

It should be noted that by forming the Verwirbelungsvorsprünge 14 no holes and / or leaks occur in the channels 22, but that even after forming the Verwirbelungsvorsprünge 14, the fluid can flow through the flow channel 22, without any openings due to the

Verwirbelungsvorsprünge 14 can escape. If the training of

Verwirbelungsvorsprünge 14 yet one or more openings in the

Slat arrangement 18 leaves, this is done advantageously on one side, which is covered by another component anyway and / or sealed. In the illustrated embodiment, therefore, the Verwirbelungsvorsprünge 14 are formed only at the top and bottom of the fin assembly 18, since they are already covered by a frame member in its arrangement in a heat exchanger and thus there is no risk of escape of fluid due to the formed Verwirbelungsvorsprünge 14 , On the other hand, in the vertical walls or Slats 20 no Verwirbelungsvorsprünge 14 formed, which would cause an opening in the fins 20 and would lead to a fluid connection of two adjacent flow channels.

Figures 5 and 6 show in schematic representations

Verwirbelungsvorrichtungen 10, which are formed as a lamellar assembly 18. The turbulators 10 can be an integral part of the

Be plate heat exchanger or to an arrangement in the

Plate heat exchanger to be formed. The lamellar arrangement 18 has a plurality of lamellae 20, which extend in the vertical direction perpendicular to the longitudinal axis 102 of the flow channels 22 and adjacent

Separate or separate flow channels 22 from each other. The lamellar arrangement 18 is designed to be flowed through by a fluid which flows along the flow direction 100 via the fluid inlets 24 into the flow channels 22. However, prior to the flow of the fluid, the flow channels 22, the fluid flows over the swirl projections 14, so that the fluid is not

moves along the flow direction 100 parallel to the longitudinal axis 102 through the flow channels 22, but also has a component of motion perpendicular to the longitudinal axis 102 of the flow channels 22. FIG. 6 shows by way of example movement trajectories 104 along which

For example, the fluid may move while flowing through the flow channels 22. By this vortex movement, the heat exchange of the fluid with the

Lamellar assembly 18 and thus increased with the heat exchanger, but without causing a significantly increased pressure drop during the flow through the flow channels 22.

FIG. 7 shows, in a schematic representation, a swirling device 10 according to a further preferred embodiment, which comprises two in one

Flow channel 22 along the longitudinal axis 102 arranged one behind the other

Verwirbelungsvorsprünge 14 has. These cause, preferably over the entire length of the flow channel 22, the swirling motion of the through

Flow channel 22 flowing fluid is maintained. This offers the advantage that over the entire length of the flow channel an improvement of the

Heat transfer can be achieved. Bezuaszeichen

1 plate heat exchanger

2 lamella

2a lamella

3 distributor blades

4 sidebars

5 cover

6 essay

6a essay

7 nozzles

8 central body

9 separating plate

10 swirling device

12 strips of material

12a blank

14 Vortex Advantage

16 frame element

18 lamellar arrangement

20 lamella

22 channel or flow channel

24 fluid inlet

100 flow direction

102 longitudinal axis of a flow channel

Claims

claims

1. swirling device (10) for a plate heat exchanger (1), wherein

- The swirling device (10) has a swirl projection (14);

- Is attached to the plate heat exchanger so that the

Verwirbelungsvorsprung (14) is arranged in and / or on a flow channel (22) of the plate heat exchanger; and

- The Verwirbelungsvorsprung (14) is adapted to vortex a fluid flowing in the flow channel (22) such that the fluid flows while performing at least one vortex movement downstream completely through the same flow channel (22).

2. swirling device (10) according to claim 1, wherein the

Swirling device (10) comprises a plurality of swirling projections (14), which are designed to swirl a fluid flowing into the flow channel (22).

3. swirling device (10) according to claim 1 or 2, wherein the

Vortexing device (10) has a plurality of swirling protrusions (14) and can be attached to a plate heat exchanger in such a way that the plurality of swirling protrusions (14) are connected to a plurality of flow channels (22) of the

Plate heat exchanger are arranged.

A swirling device (10) according to any one of the preceding claims, wherein the swirling device (10) is adapted to be arranged and / or fixed to a fluid inlet (24) of the plate heat exchanger.

5. swirling device (10) according to one of the preceding claims, wherein the swirling device (10) as a lamella (20) and / or as a lamellar assembly (18) is formed.

6. plate heat exchanger (1), comprising at least one swirling device (10) according to one of the preceding claims.

7. Plate heat exchanger according to claim 6, wherein the swirling device (10) is attached to the plate heat exchanger and / or in the

Plate heat exchanger is integrated.

8. Plate heat exchanger, comprising:

a flow passage (22) adapted to be flowed downstream by a fluid in a flow direction (100);

a swirl projection (14) disposed in the flow channel (22) and / or upstream of the flow channel (22) and configured to swirl at least a portion of the fluid flowing over the swirl projection (14) such that the fluid is under execution at least one swirling movement downstream flows completely through the same flow channel (22).

9. Plate heat exchanger according to claim 8, wherein the swirl projection (14) relative to the flow channel (22) forms along the flow direction (100) rising ramp.

10. Plate heat exchanger according to claim 8 or 9, comprising a plurality

Flow channels (22), wherein at least a part of the flow channels (22) each have at least one swirl projection (14).

1 1. Plate heat exchanger according to one of claims 8 to 10, wherein the

at least one flow channel (22) has a plurality of swirling projections (14), wherein the plurality of swirling protrusions (14) are arranged downstream of one another in the at least one flow channel (22).

12. Plate heat exchanger according to one of claims 8 to 1 1, which has at least one lamella (20).

13. Plate heat exchanger according to one of claims 8 to 12, wherein the lamella (20) at least two flow channels (22) from each other, wherein the lamella (20) is preferably formed smooth and / or perforated and / or cut.

14. Plate heat exchanger according to claim 13, wherein the swirl projection (14) is formed on the at least one lamella (20) and / or as an integral part of the lamella (20).