WO2011098477A1

WO2011098477A1 - Vibrating heat exchanger

Info

Publication number: WO2011098477A1
Application number: PCT/EP2011/051880
Authority: WO
Inventors: Jérôme DENIS; Sébastien LOGETTE; Marielle Coste
Original assignee: Veolia Water Solutions & Technologies Support
Priority date: 2010-02-12
Filing date: 2011-02-09
Publication date: 2011-08-18
Also published as: FR2956479B1; FR2956479A1

Abstract

The invention relates to a vibrating heat exchanger (10) including a plurality of plates (31) stacked on top of one another, said plates (31) defining a first channel enabling the flow of a first fluid (F1) and a second channel enabling the flow of a second fluid (F2), said first and second channels being arranged relative to one another so as to enable said first (F1) and second (F2) fluids to exchange heat. According to the invention, said plates (31) are circular and stacked concentrically along a stacking axis (Δ), and the exchanger includes means (12, 13, 20, 21, 22) for rotating and oscillating said exchanger around said stacking axis (Δ).

Description

Vibrating heat exchanger

1. Field of the invention

The field of the invention is that of the design and manufacture of heat exchangers.

The invention relates particularly to heat exchangers that can be used in the context of the treatment of fouling and / or corrosive fluids.

It finds particular application in the context of the treatment of any type of water (industrial water, wastewater, drinking water ...) or sludge (effiuent pasty).

More specifically, the invention relates to vibrating plate heat exchangers.

2. Prior Art

Plate heat exchangers are commonly used in the treatment of different types of water, for example to condense or evaporate compounds they contain.

The plate heat exchangers consist of a stack of plates, generally parallelepipedic, defining a first channel for the circulation of a first fluid and a second channel for the circulation of a second fluid, the first and second channels being disposed of. relative to each other to allow the first and second fluids to exchange heat.

The plates are stacked one on top of the other and can be welded together or held together with bolts.

The circulation of fluids in the channels of the heat exchangers generally causes the deposition of materials on the surface of the plates. This phenomenon of fouling is all the more important when the fluids circulating in the exchanger are fouling.

The fouling of the exchangers induces essentially two disadvantages: it reduces the exchange of heat between the fluids passing through the exchanger;

it impedes the smooth flow of fluids within the exchanger.

Heat exchangers must be cleaned regularly to recover their initial performance.

Known techniques known as curative whose implementation allows cleaning heat exchangers.

The cleaning of the plate heat exchangers can for example be obtained by injecting water at high speed by means of a pump. Japanese patent application JP-A-4306495 describes such a technique.

The cleaning of the heat exchangers can also be obtained by injecting a chemical cleaning solution.

Another technique, described in Japanese Patent Application JP-A-7091882, consists in scraping the surface of the plates of an exchanger with cleaning elements provided for this purpose, in order to remove the accumulated deposit on the surface of the plates. .

According to another technique, the exchanger plates are disassembled and cleaned before being reassembled.

Also known preventive techniques whose implementation prevents or at least limit the fouling of heat exchangers, and remove or reduce accordingly the frequency of implementation of curative techniques.

Japanese patent application JP-A-4306495 describes such a preventive technique which consists in vibrating a plate heat exchanger by translating it oscillatingly along an axis perpendicular to the plates.

These preventive or curative cleaning techniques are particularly advantageous insofar as they respectively make it possible to prevent the fouling of a heat exchanger or to unravel a heat exchanger. However, they have some disadvantages.

3. Disadvantages of prior art In particular, the technique of injecting water at high speed into the heat exchanger requires the use of a highly dimensioned pump whose implementation has the disadvantage of being relatively expensive.

The technique of scraping the surface of the plates of the exchanger requires the use of scraping means whose implementation proves to be quite complex and expensive.

The vibration of the heat exchanger contributes to limit its fouling by reducing the adhesion on the plates of the particles present in the fluids. This technique is not optimal, however. It only allows to limit the clogging of the exchanger but not to avoid it. Therefore, it is in practice necessary to implement, although more spacially in time, curative cleanings of the exchanger.

Furthermore, the vibration of the exchanger tends to weaken the welds of the exchangers whose plates are welded together.

4. Objectives of the invention

The invention particularly aims to overcome these disadvantages of the prior art.

More specifically, an object of the invention is to provide a vibrating plate heat exchanger whose implementation helps to prevent clogging of the plates at least in better proportions than allow the techniques of the art prior.

The invention also aims to provide such a technique that avoids, or at least limit the implementation of curative cleanings of a plate heat exchanger.

In particular, an object of the invention is to provide such a technique which prevents, or all the month limits the implementation of chemical to ensure the cleaning of a plate heat exchanger. Another object of the invention is to implement such a technique that improves the heat exchange between the fluids flowing inside a plate heat exchanger.

The invention also aims to provide a heat exchanger whose size is smaller than that of a heat exchanger according to the prior art with equivalent performance.

The invention also aims to provide such a plate heat exchanger that is simple and economical to manufacture.

5. Presentation of the invention

These objectives, as well as others that will appear later, are achieved by means of a vibrating heat exchanger comprising a plurality of plates stacked on each other, said plates defining a first channel allowing the circulation of a first fluid and a second channel for circulating a second fluid, said first and second channels being disposed relative to each other to allow said first and second fluids to exchange heat.

According to the invention, said plates are circular and stacked concentrically along a stack axis, and the heat exchanger comprises means for rotating oscillating said exchanger around said stack axis.

For the purposes of the invention, an oscillating or oscillatory rotation of the exchanger consists of driving it in rotation about its axis in one direction then in the other according to at least one portion of a turn: the exchanger is driven in the direction hourly then counterclockwise, then clockwise ...

Thus, the invention is based on a completely original approach which consists in providing a circular plate heat exchanger stacked concentrically along a stack axis around which the exchanger can be driven in oscillatory rotation by means of means for rotating.

The combined use of concentric circular plates and means for rotating the exchanger in an oscillating manner along the axis of stacking plates, when the exchanger is set in motion, to create shear phenomena on the surface of the plates, due to the kinetic energy of the fluid, said kinetic energy being derived from the mechanical energy produced by the setting means in oscillating rotation of the exchanger. These phenomena tend to limit or suppress the adhesion to the surface of the plates of the particles present in the fluids.

Therefore, the implementation of the invention allows:

to avoid or at least significantly reduce the fouling of the plate heat exchanger;

to promote heat exchange between the fluids circulating inside the exchanger.

It is thus possible to avoid or at least limit the implementation of curative cleaning of the plate heat exchanger. It is also possible to avoid the use of cleaning chemicals.

The technique according to the invention also makes it possible to reduce the size of the heat exchanger with equivalent performances.

It also reduces energy expenditure because it leads to avoid the implementation of highly dimensioned pumps to introduce water into the exchanger.

Preferably, said plates are recessed in their center.

On each side of each of the plates constituting the exchanger generally reigns a different pressure. It often happens that the plates are deformed in their center inside an exchanger. This phenomenon is called bending. To avoid this phenomenon, the thickness of the plates of the heat exchangers according to the prior art is relatively large. Providing according to the invention that the plates are recessed in their center prevents fluids from circulating inside the exchanger at the center of the plates. There is therefore no difference in pressure in this region of the plates which leads to prevent the occurrence of the phenomenon of bending. It is thus possible to reduce the thickness of the plates. This helps, on the one hand, to improve exchange of heat between the fluids circulating inside the exchanger, and secondly to reduce the amount of material required for the manufacture of a heat exchanger and therefore the cost of its manufacture.

This feature also has the advantage of ensuring that the fluid velocity at the surface of the plates is never zero, which helps prevent fouling on the entire surface of the plates.

In this case, said plates preferably have a thickness of less than one millimeter.

According to an advantageous characteristic, said means for rotating comprise an unbalance motor and a shaft connected to said motor and secured to said exchanger, the axis of said shaft coinciding with said stack axis.

This implementation makes it possible to rotate the exchanger around the stacking axis of the plates in a simple, reliable and efficient manner.

According to an advantageous characteristic, said stacking axis extends vertically.

According to another advantageous characteristic, said stacking axis extends horizontally.

The choice of the direction of the stacking axis is related to the nature of the rotating means used.

According to a preferred aspect of the invention, said rotating means are provided for printing said exchanger oscillating rotation movement around said stack axis at a frequency between 10 and 60 Hz and preferably between 25 and 50 Hz.

The oscillating rotation of the exchanger at such frequencies makes it possible to generate a large shear force on the surface of the plates while preserving the integrity of the exchanger.

According to an advantageous characteristic, said exchanger is rotatable about said stacking axis (Δ) in oscillations of angular amplitude less than or equal to 15 °.

An exchanger according to the invention preferably comprises seals sealing means interposed between said plates, a lower clamping plate and an upper clamping plate, said plates being held together between said lower and upper clamping plates by means of bolts.

The plates of an exchanger according to the invention are not secured to each other by means of weld seams. On the contrary, they are fixed together by bolts. The exchangers according to the invention are therefore easy and inexpensive to manufacture. They also resist vibration well.

According to a preferred feature, said plates are traversed by perforations for the passage of said fluids, said perforations being provided at the periphery of said plates.

This makes it possible to promote the path of the fluid over the total exchange surface and to induce a maximum of shear stresses to the fluid when it arrives on a plate.

This also makes it possible to limit the risk of fouling, or even obstruction, of perforations of the plates. Indeed, the fact of placing the perforations at the periphery of the plate, increases the shear stresses and thus limit fouling.

According to an advantageous characteristic, each of said plates is traversed by two perforations, said perforations being provided along two axes orthogonal to said stacking axis which extend in the plane of said plate and form between them a non-zero angle α. Said seals each have two diametrically opposed fluid passages. Said plates are stacked in pairs so that one of their perforations coincides with one of the perforations of the superimposed plate and the other of its perforations is diametrically opposed to the other perforation of said superimposed plate. Said seals are arranged between said plates so that they each have a passage which coincides with two coinciding perforations of two superimposed plates.

This implementation allows each of the fluids circulating in the exchanger to enter the space formed between two plates and to leave them by means of diametrically opposed ports. The flow directions of the hot and cold fluids intersect. The heat transfers within the heat exchanger are thus optimized because the flow of fluids within the exchanger is close to a flow of the countercurrent type.

Preferably, the value of said angle α is of the order of 90 °. This makes it possible to further improve heat exchange within the exchanger.

According to an advantageous characteristic of the invention, said exchanger comprises means for activating / deactivating said rotating means at a predetermined time interval.

The exchanger can thus be momentarily rotated and then momentarily kept stationary for predetermined periods. This may especially be the case when the fluids flowing there are weakly fouling. It is thus possible to save energy.

According to another advantageous characteristic, an exchanger according to the invention comprises means for injecting at least one abrasive agent into at least one of said first and second fluids upstream of said first and / or second channels.

The combined effect of the vibration and these abrasive agent (s) in the fouling fluid (s) is intended to reduce, even more, the possible risks of deposition on the surfaces of exchange. Furthermore, the addition of abrasive agent (s) in the fouling fluid (s) does not influence the normal operation of the heat exchanger and makes it possible to overcome phase curative cleansing. These abrasive agents may advantageously be in the form of abrasive particles.

6. List of figures

Other characteristics and advantages of the invention will appear more clearly on reading the following description of a preferred embodiment, given as a simple illustrative and nonlimiting example, and the appended drawings, among which:

FIG. 1 illustrates a perspective view of a heat exchanger vibrator according to the invention capable of rotating about a vertical axis; FIG. 2 illustrates means for transmitting an oscillating rotational movement to an exchanger according to the invention;

Figure 3 is a sectional view of the exchanger illustrated in Figure 1 along a plane passing through the axis of this exchanger;

FIG. 4 illustrates a view from above of a plate of an exchanger according to the invention;

Figure 5 illustrates a top view of a central seal intended to be interposed between two plates of an exchanger according to the invention;

FIG. 6 illustrates a perspective view of a peripheral seal intended to be interposed between two plates of an exchanger according to the invention;

FIG. 7 illustrates an exploded view of a stack of plates and joints of an exchanger according to the invention;

Figure 8 illustrates a perspective view of a vibrating heat exchanger according to the invention capable of rotating about a horizontal axis.

7. Description of an embodiment of the invention

7.1. Recall of the principle of invention

The general principle of the invention is based on a heat exchanger with circular plates concentrically stacked along a stack axis and which can be driven in oscillatory rotation by means of rotation around the axis of rotation. stacking.

The combined use of concentric circular plates and means for rotating the exchanger in an oscillating manner along the stack axis of the plates makes it possible, when the exchanger is set in motion, to create shear phenomena on the surface of the plates. plates, due to the kinetic energy of the fluid, said kinetic energy being derived from the mechanical energy produced by the oscillating rotation means of the exchanger. These phenomena tend to limit or suppress the adhesion to the surface of the plates of the particles present in the fluids.

The invention thus makes it possible in particular: avoid or at least significantly reduce the fouling of the plate heat exchanger;

to promote heat exchange between fluids circulating inside the exchanger.

7.2. Example of a heat exchanger according to the invention

In relation with FIG. 1, an embodiment of a vibrating heat exchanger according to the invention is presented.

As shown in this FIG. 1, such a vibrating heat exchanger 10 comprises a concentric circular plate heat exchanger 11.

This heat exchanger 11 is mounted on a shaft 12 whose axis coincides with the axis along which the plates of the exchanger 11 are stacked.

The shaft 12 is connected to oscillating rotation means of the exchanger 11 around the stack axis of the plates.

In this embodiment, the rotating means comprise an unbalance motor 13 and transmission means (not shown) by means of which the shaft 12 is connected to the motor 13.

As shown in FIG. 2, the transmission means may for example comprise a connecting rod 20, one end of which is secured to the output shaft 21 of the motor 13, and the other end of which is secured to a pulley 22 secured to the shaft 12. The rotation of the motor 13 generates an oscillating rotation according to the arrow A of the shaft 12 and the exchanger 11 which is integral therewith.

The oscillating rotation means of the exchanger are provided so that the frequency of the oscillations is equal to 40 Hz. In variants, the frequency of the oscillations may be between 10 and 60 Hz and preferably between 25 and 50 Hz.

Other rotation means may be implemented in variants of this embodiment. In this embodiment, the shaft 12 extends vertically and the plates of the exchanger 11 extend horizontally.

FIG. 3 illustrates a sectional view along the plane P of the plate heat exchanger 11, which in this embodiment is of multipass type and the circulation of the fluids is countercurrent.

As appears from this FIG. 3, the heat exchanger 11 comprises a plurality of plates 31 stacked concentrically one above the other along a stacking axis Δ. Seals 32 and 48 are interposed between the plates 31. The plates 31 and the seals 32, 48 are held stacked between a lower clamping plate 33 and an upper clamping plate 34 secured to each other by means of screws 35. which pass right through the upper clamping plate 34, the plates 31, the seals 32 and are screwed into the lower clamping plate 33.

A compensation plate 36 is interposed between the lower clamping plate 33 and the last plate 31 '. This compensation plate 36 may allow, when removed, the addition of other plates 31 to modify the performance of the heat exchanger 11 according to the desired performance. It also makes it possible to modulate the mass of the exchanger according to the number of plates and seals used so as to respect the torsional stress allowable by the shaft.

This compensation plate is therefore a security element. In order for the shaft to twist properly, the heat exchanger must have a given mass which is determined by the mechanical and geometrical characteristics of the shaft. Thus, if the number of plates and joints is insufficient to reach this determined mass, we must add the mass, hence the implementation of the compensation plate.

In this embodiment, the plates 31 are recessed in their center. A threaded rod 37 screwed into the lower clamping plate 33 extends perpendicularly thereto. The plates 31 are stacked along the threaded rod 37. A nut 38 screwed to the end of the threaded rod 37 is tightened against the upper clamping plate 34 to hold the plates 31 compressed against each other at their center.

An end 39 of the shaft 12 is secured to the lower clamping plate 33 by means of screws 40 such that the axis Θ of the shaft 12 coincides with the stacking axis Δ.

The plates 31 define a first channel for the circulation of a first fluid and a second channel for the circulation of a second fluid, the first and second channels being arranged relative to each other to allow the first and second fluids to exchange heat.

The exchanger 1 1 has a first inlet 41 and a first outlet 42 for the first fluid. It also has a second input 43 and a second output 44 for the second fluid.

FIG. 4 illustrates a view from above of a plate 31.

As is shown in this FIG. 4, the plates 31 have a circular contour and a central recess 47. They are pierced all along their periphery by holes 45 provided to allow the screws 35 to pass. They are also traversed by two perforations 46 formed along two axes orthogonal to the stacking axis Δ which extend in the plane of each plate 31 and form between them a non-zero angle α. In this embodiment, the angle α is equal to 90 °. These perforations 46 are formed at the periphery of the plates 31 and respectively allow the passage of the first and second fluids. The plates 31 have a thickness of less than 1 millimeter. They can be made of conventional metal alloys (steels, stainless steels, etc.), plastics, noble materials such as titanium or high qualifications in terms of boilermaking (tantalum, zirconium ...). They can also be made of multilayer materials (for example bi or three-layer) which make it possible to reduce the resistance to heat transfer and to increase the resistance to corrosion (for example a titanium / carbon steel bilayer material). The choice of the material used for the manufacture of the plates 31 depends on the nature of the fluids circulating on their surface. Figure 5 illustrates a central seal 48 to be interposed between the plates 31 at the contour of their central recess 47. This is for example a rubber O-ring.

Figure 6 illustrates a peripheral seal 32 to be interposed between the plates 31 at their outer peripheral contour. This is a flat annular seal. It is traversed all along its periphery by holes 49 provided to allow the passage of screws 35. This seal also has two diametrically opposed fluid passages 50 provided to coincide with some of the perforations 46 of certain plates 31 as will be explained more in detail thereafter. It is for example made of rubber.

FIG. 7 illustrates the manner in which the plates 31 are stacked. In this embodiment, the heat exchange is of the single-pass type and is done in countercurrent. The plates 31 are stacked in pairs so that one of their perforations 46 coincides with one of the perforations 46 of the superimposed plate 31 and the other of its perforations 46 is diametrically opposed to the other perforation 46 of the plate 31. superimposed. The peripheral seals 32 are arranged between the plates 31 so that they each have a passage 50 which coincides with two perforations 46 coinciding with two plates 31 superimposed.

More specifically, a peripheral seal 32 is placed on the lower clamping plate 33 so that one of its passages 50 coincides with the second outlet 44. A central seal 48 is deposited in the center of the lower clamping plate 33. plate 31 is then deposited on the seal 32 so that one of its perforations 46 coincides with the passage 50 of the seal 32 coinciding with the second outlet 44, and the other of its perforations 46 is diametrically opposed to the first inlet 41. Another peripheral seal 32 is deposited on the plate 31 in such a way that one of its passages 50 coincides with the perforation 46 diametrically opposed to the first inlet 41. A central seal 48 is deposited in the center of the plate 31. A new plate 31 is deposited on the seals 32 and 48 in such a way that one of its perforations 46 coincides with the passage 50 of the seal 32 coinciding with the perforation 46 and that the other of its perforations ations 46 diametrically opposed to the other perforation 46 of the plate 31 above. A plurality of plates 31 and seals 32, 48 are stacked according to this principle, the last plate consisting of the upper clamping plate 34 whose first outlet 42 is diametrically opposite one of the perforations 46 of the previous plate 31 and the second entry 43 coincides with the other perforation 46.

The plates 31 thus define a first channel for the circulation of the first fluid Fl and a second channel for the circulation of the second fluid F2, the first and second channels being arranged relative to each other to allow the first and second fluids to exchange heat. The first fluid F1 enters the exchanger via the first inlet 41 and leaves it through the first outlet 42. The second fluid F2 enters the exchanger via the second inlet 43 and leaves it through the second outlet 44. The first and second fluids circulate inside the exchanger and exchange heat without coming into contact with each other.

As can be seen more clearly in FIG. 1, the lower clamping plates 33 and upper 34 are traversed by four bores 14 capable of providing the input or output function. Depending on the number of plates used, two of the holes in each clamping plate will be closed so that the fluids circulate inside the exchanger as just described.

7.3. variants

FIG. 8 illustrates a variant of a vibrating heat exchanger according to the invention in which the shaft 12 extends horizontally and the plates of the exchanger 11 extend vertically.

According to one variant, the plates of the exchanger may not be recessed in their center.

The materials used for the manufacture of plates and seals may be chosen according to the nature of the circulating fluids through the exchanger. The fluids passing through the heat exchanger may be in the liquid state or in the gaseous state. The different fluids passing through the exchanger may each have a different state. One may be in the liquid state and the other in the gaseous state.

In addition, depending on the characteristics of the fluids and in particular their fouling power, it may be provided to add, periodically or continuously, particles having abrasive properties. The combined effect of vibration and abrasive particles in fouling fluids is to further reduce the potential risk of deposition on the exchange surfaces. Furthermore, the addition of abrasive particles in the fouling fluids does not prevent the normal operation of the heat exchanger and eliminates curative cleaning phase.

The particles having abrasive properties may be of the glass microbead type, ceramic microbead, microsand, metal oxide particle. Preferably, the added particles will have a hardness lower than that of the material constituting the heat exchange plates so as not to damage said plates. Finally, the abrasive particles will have a particle size of between 30 and 200 μm.

These abrasive particles will be introduced into the fouling fluids upstream of the heat exchanger directly into the feed pipe of the fouling fluid.

In a variant, the feed pipe of a static mixer placed downstream of the zone of introduction of the abrasive particles into the feed pipe will be equipped to ensure a homogeneous mixture of the abrasive particles in the fouling fluid.

The heat exchanger can be single-pass or multi-pass. The circulation of the two fluids in the exchanger can be carried out either against the current or co-current.

The exchanger may optionally be equipped with means for activating / deactivating the oscillating rotation means at intervals predetermined. Starting, at a predetermined time interval, the oscillating rotation means, makes it possible to save energy. However, the choice to activate the oscillating rotation means will be based on the characteristics of the fluids and in particular their fouling power. Also, depending on the nature of the fouling fluid, it may be decided that the rotating means operate continuously or discontinuously.

The activation / deactivation means comprise in particular a timer or an automaton capable of being programmed to switch on or off, at predetermined time intervals, the oscillating rotation means.

7.4. Advantages

The implementation of the invention prevents clogging of a plate heat exchanger without requiring the use of adjuvants or chemicals. It thus also makes it possible to increase heat transfer within the exchanger.

Since the technique according to the invention makes it possible to improve heat transfer within the heat exchanger, it is possible to reduce the size of the heat exchanger to an equal level of performance. This helps reduce the cost of manufacturing a heat exchanger.

Reducing the size of the exchanger also makes it possible to reduce the size of the pumps used to circulate the fluids through the exchanger.

The fact of using recessed plates at their center makes it possible to avoid bending the plates. This makes it possible to reduce the thickness of the plates and to reduce accordingly the quantity of raw material necessary for the manufacture of a vibrating exchanger. The implementation of this characteristic thus leads to lowering the manufacturing cost of a vibrating exchanger. It also improves heat exchange within the exchanger.

The assembly of the plates by bolting also facilitates assembly compared to welding assembly techniques. It also allows the use of materials with high corrosion resistance which are most of the time difficult to weld. This assembly mode is also versatile in that it allows the addition or removal of plates to change the performance level of the exchanger as needed.

Claims

A vibrating heat exchanger (10) comprising a plurality of plates (31) stacked on each other, said plates (31) defining a first channel for the circulation of a first fluid (F1) and a second channel for circulating a second fluid (F2), said first and second channels being arranged relative to each other to allow said first (Fl) and second (F2) fluids to exchange heat,

characterized in that said plates (31) are circular and stacked concentrically along a stack axis (Δ),

and in that it comprises oscillating rotation means (12, 13, 20, 21, 22) of said exchanger around said stacking axis (Δ).

2. Exchanger according to claim 1, characterized in that said plates (31) are recessed in their center.

3. Exchanger according to claim 2, characterized in that said plates (31) have a thickness of less than one millimeter.

4. Exchanger according to any one of claims 1 to 3, characterized in that said oscillating rotation means comprise an unbalance motor (13) and a shaft (12) connected to said motor (13) and secured to said exchanger, the axis of said shaft (12) coinciding with said stacking axis (Δ).

5. Exchanger according to any one of claims 1 to 4, characterized in that said stacking axis (Δ) extends vertically.

6. Exchanger according to any one of claims 1 to 4, characterized in that said stacking axis (Δ) extends horizontally.

7. Exchanger according to any one of claims 1 to 6, characterized in that said rotating means (12, 13, 20, 21, 22) are provided to print said exchanger an oscillating rotational movement about said axis of rotation. stacking (Δ) at a frequency of between 10 and 60 Hz.

8. Exchanger according to any one of claims 1 to 7, characterized in that it comprises seals (32) interposed between said plates (31), a lower clamping plate (33) and an upper plate of Tightening (34), said plates (31) being held together between said lower (33) and upper (34) clamping plates by means of bolts (35).

9. Exchanger according to any one of claims 1 to 8, characterized in that said plates (31) are traversed by perforations (46) for the passage of said fluids, said perforations (46) being formed at the periphery of said plates ( 31).

10. Exchanger according to claim 9, characterized in that each of said plates (31) is traversed by two perforations (46), said perforations (46) being provided along two axes perpendicular to said stacking axis (Δ) which extend in the plane of said plate (31) and form between them a non-zero angle (a) and in that said seals (32) each have two diametrically opposed fluid passages (50), said plates (31) being stacked two to two so that one of their perforations (46) coincides with one of the perforations (46) of the plate (31) superimposed and the other of its perforations (46) is diametrically opposed to the other perforation (46). ) of said superimposed plate (31), and said seals (32) are arranged between said plates (31) so that they each have a passage (50) which coincides with two perforations (46) coinciding with two plates (31) superimposed.

11. Exchanger according to any one of claims 1 to 10, characterized in that said exchanger is rotatable about said stack axis

(Δ) according to oscillations of angular amplitude less than or equal to 15 °.

12. Exchanger according to any one of claims 1 to 11, characterized in that it comprises means for activating / deactivating said means for rotating at a predetermined time interval.

13. Heat exchanger according to any one of claims 1 to 12, characterized in that it comprises means for injecting at least one abrasive agent into at least one of said first and second fluids upstream of said first and / or or second channel.