Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
  • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
  • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B17/00—Methods preventing fouling
  • B08B17/02—Preventing deposition of fouling or of dust
  • B08B17/06—Preventing deposition of fouling or of dust by giving articles subject to fouling a special shape or arrangement
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
  • E03B7/00—Water main or service pipe systems
  • E03B7/006—Arrangements or methods for cleaning or refurbishing water conduits
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
  • F24D19/00—Details
  • F24D19/0092—Devices for preventing or removing corrosion, slime or scale
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D21/0015—Heat and mass exchangers, e.g. with permeable walls
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F1/00—Tubular elements; Assemblies of tubular elements
  • F28F1/003—Multiple wall conduits, e.g. for leak detection
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
  • F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
  • F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
  • F28C3/00—Other direct-contact heat-exchange apparatus
  • F28C3/06—Other direct-contact heat-exchange apparatus the heat-exchange media being a liquid and a gas or vapour
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D21/0001—Recuperative heat exchangers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
  • F28D21/0001—Recuperative heat exchangers
  • F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
  • F28F13/003—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by using permeable mass, perforated or porous materials
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
  • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
  • F28F13/185—Heat-exchange surfaces provided with microstructures or with porous coatings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2245/00—Coatings; Surface treatments
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2245/00—Coatings; Surface treatments
  • F28F2245/08—Coatings; Surface treatments self-cleaning

Definitions

• the present invention generally relates to the field of heat exchangers and more particularly relates to the problem of fouling of these surfaces.
• heat exchangers have simple or complex shapes, but are typically constructed so as to allow the transfer of a heat flow from a hot fluid to a cold fluid through a wall without direct contact between the two fluids (without mixing them).
• the cleaning agent is then dispersed in the volume, at a relative velocity with respect to the biofilm or high organic deposits and a surface action only. Thus, it does not penetrate the entire thickness of the biofilm or the deposit Inorganic to be treated, a large part of the volume of cleaning agent injected at the inlet is found at the output which requires large volumes of cleaning agents for reduced efficiency.
• the present invention proposes the use of a polymeric protective film applied to a surface of a wall in order to fight against fouling / scaling, the protective film being dense (therefore generally considered as non-porous / waterproof, in particular to liquids), but having a permeability to a gaseous cleaning agent.
• a polymeric protective film applied to a surface of a wall in order to fight against fouling / scaling
• the protective film being dense (therefore generally considered as non-porous / waterproof, in particular to liquids), but having a permeability to a gaseous cleaning agent.
• the invention relates to a heat exchanger system comprising a wall separating a first fluid from a second fluid and allowing a heat exchange between said fluids.
• the system is remarkable in that a protective film of polymer material is applied to said wall at least on the side of the first fluid, the protective film having a front face in contact with the first fluid and an opposite rear face facing the wall.
• gas distribution means are provided for dispensing a gaseous cleaning agent on the side of the rear face of the protective film
• the protective film is a dense polymer film, in particular sealed or not very permeable to the first fluid, while presenting a permeability to said gaseous cleaning agent, so as to allow the gaseous cleaning agent to pass through the protective film towards the front face thereof.
• the passage of the cleaning gas through the protective film takes place under the effect of the partial pressure difference between the rear face and the front face of the protective film.
• the cleaning action is therefore not based on the pressing force of the gaseous cleaning agent, but on its chemical action (eg oxidation or dissolution) with the deposits on the front side of the protective film.
• gaseous cleaning agent is brought directly and integrally to the base of the deposit.
• the consumption of gaseous cleaning agent can thus be minimized, which is economically and environmentally favorable.
• the contribution induces a strong concentration gradient at the interface between the support and the deposit; - flexibility of implementation: it is possible to modulate the frequency and the duration of treatment in order to limit the thicknesses of deposits / biofilms.
• the introduction of the gaseous cleaning agent through the protective film is independent of the presence or absence of liquid on the outer surface; there is therefore no need to stop the heat exchange process to proceed with the cleaning.
• a heat exchanger comprises at least one exchanger tube for the circulation of one of the two fluids, in heat exchange with the other fluid around the exchanger tube, said wall being constituted by at least a portion of said exchanger tube.
• the protective film is applied to the inner or outer surface of the exchanger tube on the side of the first fluid, and optionally another protective film is applied to the surface of the exchanger tube on the side of the second fluid.
• the invention relates to an article with an anti-deposition wall, said article comprising a wall having a surface covered at least by partly by a protective film of polymeric material having a rear face facing the wall and an opposite front face.
• the protective film is a dense polymer film having permeability to a gaseous cleaning agent.
• Gas distribution means are provided for dispensing the gaseous cleanser on the back side, and thus allowing the cleaning of the front face of the protective film as the gaseous cleaning agent passes through the protective film from the back side to the back side. front face.
• the combination of the protective film with a support wall covered by the protective film thus forms an anti-deposition wall structure that can be used in many applications. This produces an article whose wall can be cleaned.
• Such an anti-deposition wall structure can be used, of course, in the field of exchangers, in particular heat, but also material, tubular, planar or other. But the invention is applicable in a variety of areas, in which a wall / surface is likely to be contaminated or foul.
• the article is a tube or pipe comprising a wall defining a passage for a liquid
• the protective film is applied to the inner and / or outer surface of the wall.
• the protective film is applied over the entire inner or outer periphery.
• the article is generally a tube, pipe or pipe and the protective film is applied to the inner surface of the wall.
• the aim here is in particular for use in water network systems, particularly ultra-pure water used in certain industries.
• the article could also comprise a substantially flat wall, the protective film covering at least partly the surface of the flat wall.
• the flat wall may be a table or bench, for example, in an analysis laboratory.
• the invention generally relates to an anti-deposition wall system, in which the protective film permeable to the gaseous cleaning agent covers a solid wall, gas distribution means being provided for dispensing a gaseous cleaning agent. on the side of the back side of the protective film.
• the protective film of polymer material is said to be "dense", that is to say that it is generally considered to be non-porous or impervious, or at the very least not very permeable to liquids.
• the dense polymer film exhibits permeability to gaseous cleaning agents.
• the protective film has a "selective" permeability to the gaseous cleaning agents, in that the polymer of the protective film is chosen for its affinity with predetermined gaseous cleaning agents, so as to present good permeability to these gaseous cleaning agents but not to other fluids likely to come into contact with the wall during use.
• the permeability of a polymer makes it possible to evaluate the amount of material passing through a material of given thickness per unit area and time, for a normed driving force.
• the permeability of the polymer materials with respect to different gaseous or liquid compounds is referenced for many systems and can be determined experimentally by standard techniques (time lag method for example).
• the polymer for the protective film will therefore be chosen so that it has a good permeability to the cleaning gas, for example of the order of 1 to 1000 Barrer, preferably between 100 and 1000 Barrer, while being substantially impermeable, or poorly permeable to the fluid in contact with the wall.
• the permeability cleaning gas of the protective film may in particular be of the order of 500 Barrer.
• the protective film preferably has a fluid permeability in contact with the wall below 100 Barrer. It should be noted in this context that the passage of the fluid in contact with the protective film can be greatly limited by setting a partial pressure downstream, rear side (eg use of a moist gas cleaning agent, to block the passage of water).
• the protective film may be made of PolyTetrafluoroethylene, PolyMethylPentene, PolyEtherSulfone, Polysulfone, Ethylene-Propylene-Diene (EPDM), Polyimide, Cellulose Acetate, Ethylcellulose, Polydimethylsiloxane, Polyamide, or PolyEtherBlocAmide.
• the gaseous cleaning agent is selected from the following agents: CO2, CI2, O3, H2O2, pure or diluted, and mixtures thereof.
• the above-mentioned polymers have the desired selectivity and permeability with respect to these gaseous cleaning agents, while offering a limited permeability to liquids such as water or the fluids used in the exchangers.
• the gas distribution means can take any suitable form to bring the gas to the back of the protective film, depending on the applications and implementation. As the gas flow takes place due to the partial pressure difference of the cleaning gas (low concentration in the front part), there is no need for high pressures in the distribution means, respectively at the rear of the protective film. .
• the gas distribution means are advantageously designed to distribute the cleaning gas substantially over the entire rear face of the protective film, to allow a uniform / homogeneous treatment.
• the gas distribution means comprise a network of channels for the distribution of gas. These channels can be formed directly in the wall, thus located under the protective film. It will be possible here to employ any technique of structuring the surface of the support wall (plate or tube), and in particular: grooves stamped, machined or extruded, chemical etching, abrasion; these surface preparations to allow the homogeneous distribution of the active agent (free circulation of cleaning gas).
• the channels may be provided in an intermediate layer, between the wall and the protective film. This is to place a porous interlayer such as a textile film, polymer foam or metal, perforated metal, allowing the realization of a space between the protective film and the wall, suitable for conveying the cleaning gas.
• a porous interlayer such as a textile film, polymer foam or metal, perforated metal
• the gas distribution means comprise an inlet manifold in communication with said channel network. They may also include an outlet manifold to allow purging, e.g. circulating a purge gas between the inlet and outlet manifold.
• the fixing of the protective film on the wall which supports it can be done by any appropriate means, in particular by gluing or by mechanical means (eg crimping), at the periphery of the plate.
• the protective film may have adhesion properties, especially during its implementation.
• the protective film and the wall may be made of the same material, preferably with the distribution network of the cleaning gas.
• a fraction of the fluid can diffuse through the wall on the side of the back side.
• the distribution means flutes and others
• a condensate including condensed water vapor.
• the distribution means form a cul de sac for the gas, which is not conducive to the flow of the fluid coming from the front face by permeance, despite a low permeance.
• This condensate can be evacuated by purging, for example.
• Fig.1 a diagram illustrating the principle of the invention with a) configuration of conventional heat exchanger, b) cleaning operation of the conventional exchanger and c) heat exchanger embodying the invention;
• Fig.2 diagram of a pipe comprising a protective film on its outer surface
• Fig.3 diagram of a pipe comprising a protective film on its inner and outer surfaces
• Fig.4 an embodiment of a heat exchanger plate
• Fig.5 schematic diagram of a worktop with a protective film
• FIG. 6 schematic diagram of a pipe including a protective film on its inner surface.
• the principle of the invention will first be explained with respect to FIG. FIG. 1 schematizes a conventional heat exchanger principle, in which a transfer of heat between two fluids, represented respectively by arrows 2 and 4, takes place through a wall 6 (heat exchange wall), without mixing between the fluids.
• the wall 6 is generally made of a solid, non-porous polymer with appropriate mechanical and chemical resistance. With time, the exchange surface of the wall 6 becomes dirty: a deposit 8 of biofilm is formed on the side of the fluid 4.
• the fight against fouling of the surface is conventionally done by adding a cleaning agent, also called active agent (eg chlorine) in the fluid 4 to come into contact with the deposit of the liquid vein side, as shown schematically in FIG. Fig.1 b).
• a cleaning agent also called active agent (eg chlorine)
• active agent eg chlorine
• the principle of the invention is illustrated in Figure 1 c). It recognizes the wall 6 (solid and non-porous) which separates the two fluids and allows a heat transfer between them without direct contact.
• the wall 6 comprises two opposite faces 6.1 and 6.2 which constitute heat exchange surfaces.
• the reference sign 10 denotes a protective film of polymer material which at least partially covers the surface 6.1 of the wall 6 on the side of the fluid 4.
• the polymer film 10 has a front face 10.1 in contact, in use, with the fluid 4 and a rear face 10.2 opposite, facing the wall 6.
• the protective film 10 is dense, so fluid tight 4, while being permeable to a gaseous cleaning agent (represented by the horizontal arrows), which can be introduced on the side of the rear face of the protective film 10 so as to pass through the protective film and attack the deposition 8 to "countercurrent".
• a gaseous cleaning agent represented by the horizontal arrows
• the distribution of the gaseous cleaning agent behind the protective film 10 is by means of gas distribution explained below.
• the present concept therefore proposes the addition of gaseous cleaning active agent (eg CO2, CI2, O3, H2O2 ”) through a dense polymer film having a predetermined and selective permeability for the gaseous cleaning agent, allowing a cleaning action at the surface / deposit interface.
• gaseous cleaning active agent eg CO2, CI2, O3, H2O2
• a dense polymer film having a predetermined and selective permeability for the gaseous cleaning agent
• control means conventionally used to prevent scale deposits or biofilms are based on pretreatments of the fluids to be treated (addition of sequestering agents or biocides, for example), or else sequences of cleaning of the surfaces by circulation of active solutions (procedures of the type "Cleaning In Place", CIP, and “Disinfection In Place", DIP: acids, bases, biocides ).
• the use of a deposition gas-guiding agent by countercurrent injection via the wall material of the exchanger has the following advantages:
• the supply of cleaning gas is selectively, i.e. intermittently, adjusting the frequency and duration of gas supply according to the desired treatment.
• the protective film is a dense polymer film, i.e. it is generally considered non-porous or waterproof, and is particularly impermeable to liquids.
• the dense polymer film has a permeability to gaseous cleaning agents, in particular to CO2, Cl 2, O 3, H 2 O 2.
• polymers such as PolyTetrafluoroethylene, PolyMethylPentene, PolyEtherSulfone, Polysulfone, Ethylene-Propylene-Diene (EPDM), Polyimide, Cellulose acetate, Ethylcellulose, Polydimethylsiloxane, Polyamide,
• PolyEtherBlocAmide or Teflon-AF. These polymers are particularly interesting because they are dense and combine mechanical, thermal, and chemical resistance, while being gas permeable but impermeable to liquids (or low permeability). These examples are not limiting and the skilled person may use other polymers meeting these criteria.
• the gas permeance of the protective film can be adjusted by varying the thickness and choice of the polymer. This allows certain adaptations with respect to the choice of cleaning gas.
• the protective film may have a thickness of the order of 0.1 ⁇ to 2 mm, more particularly from 0.5 to 10 ⁇ .
• the protective film and the wall may be made of the same material, for example by extrusion. This allows in particular to make splines in the support wall for the distribution of cleaning gas. This solution avoids the difficulties that could be encountered with a composite material.
• a protective film with a wall thickness of the order of a millimeter, with a material permeable to one of the targeted active agents, is compatible with extrusion, the support wall having a greater thickness to form a solid sealed wall.
• the protective film is fixed by means of an adhesive. It will also be noted that, since no overpressure of the active gaseous agent with respect to the biofilm generating fluid is necessary, there is no risk of deformation or degradation of the geometry of the system by the pressure of the gaseous agent. It is therefore possible to apply the protective film without seeking complete adhesion of the surface.
• the polymer film can be maintained at least at its ends and at least to seal the device allowing a homogeneous supply of the active agent between the latter and the support (plate, tube).
• the tube 20 comprises a cylindrical wall 22 having an inner surface 22.1 and an outer surface 22.2 and defining an internal passage 24.
• the tube 20 may be made of any suitable material, metal or polymer, depending on the intended application.
• the wall 22 constitutes a heat exchange wall between a first fluid, flowing in the internal passage 24 and a second fluid, on the opposite side of the wall 22.
• the outer surface 22.2 of the tube is covered , over its entire periphery, a protective film 26 dense polymer material as explained with reference to Figure 1.
• the protective film 26 is impervious to the second fluid which circulates outside the tube 20.
• the protective film 26 may be made such a tubular sheath having a diameter corresponding to the outer diameter of the tube 20 and held in place by its ends.
• the protective film 26 is chosen to have a selective permeability to one or more gaseous cleaners while being leak-tight (or less permeable) to the second fluid (in particular liquid) circulating outside the tube 20 and in contact with the outer face of the 26.
• the cleaning gas is conveyed to the rear of the protective film 26 by a series of splines 28 (longitudinal grooves parallel to the axis of the tube) formed in the outer surface of the tube. By introducing the cleaning gas into these grooves 28 it can be distributed over the entire length of the tube 20.
• the protective film 26 As the protective film 26 is permeable vis-à-vis the cleaning gas, it will be able to pass from the rear face 26.1 of the film 26 to the front face 26.2, and thus meet the base deposits (biofilms or other) that have tendency to form. However, since the protective film 26 is tight, in particular to the second fluid in contact with the protective film, the second fluid does not penetrate into the grooves 28. It will also be noted with interest that the passage of the cleaning gas through the film 26 takes place mainly due to the difference in partial pressure of the cleaning gas between the two faces of the protective film 26. It is therefore not necessary to maintain a significant gas pressure in the spline network. Thus, the cleaning of the deposits on the surface 26.2 is due to the chemical activity of the cleaning agent chosen, and therefore not because of the use of gas pressures to loosen the deposits.
• FIG. 3 Another embodiment is illustrated in FIG. 3, in which the tube 20 of FIG. 2 is provided with a protective film 26 on the inner and outer surface.
• the tube 20 thus comprises splines 28 'in the inner periphery of the wall, that is to say in the inner surface 22.2.
• the wall 22 of the tube 20 acts as a structural wall and heat exchange, as well as as a protective film support.
• the splines 28 and 28 ' which form a gas distribution means or network, are formed directly in the wall 22 of the tube. Such grooves or grooves for gas distribution are obviously easily made by extrusion conventionally used for the manufacture of tubes, or by machining or 3D printing.
• FIG. 4 schematically illustrates a plate 30 for a plate heat exchanger according to a variant of the invention.
• the plate 30 has a generally rectangular shape and includes orifices 32 for the passage of pipes (not shown) for the introduction or collection of fluid.
• the plate 30 forms a partition wall between two fluids and therefore comprises a front face 30.1 and an opposite rear face, which form exchange surfaces.
• the front face 30.1 is partially covered by a protective film 34 (shown in dotted lines) which covers the majority of its surface.
• the protective film 34 is of the same type as the protective film described above, that is to say that it is fluid / liquid tight which will come into use, in contact with the protective film and that it has a permeability to a gaseous cleaning agent brought by the rear face of the film 34, that turned towards the front face 30.1 of the plate 30.
• the protective film 34 is fixed on the plate at its periphery by gluing or by any appropriate means, eg. crimping (not shown).
• the cleaning gas distribution means comprise a plurality of longitudinal grooves 36 formed in the front face 30.1 and forming a cleaning gas distribution network.
• the cleaning gas is introduced into the grooves 36 through a transverse groove 38 forming an inlet manifold, communicating with an inlet port 40 via a pipe 42.
• the grooves 36, 38 are closed. , in the plane of the surface 30.1 of the plate, by the protective film 34.
• the cleaning gas is therefore in contact with the rear face of the film 34 and diffuses towards the front face thereof by the effect of the partial pressure difference of the cleaning gas between the two faces.
• a gas source 44 comprising a line 46 with a regulating valve 48 is connected to the inlet port 40.
• the valve 48 allows the selective introduction of predetermined quantities of gas into the groove network 38.
• the protective film sealingly closes them to the circulating exchanger fluid.
• the cleaning gas is directly in contact with the rear face of the protective film but the fluid / liquid on the side of the front face can not penetrate into the distribution channels of the cleaning gas.
• FIG. 5 A last variant concerning a worktop 50 with an anti-deposition wall is schematically represented in FIG. 5.
• a table with four legs 52 and a plate 54 defining a worktop are recognized.
• the upper surface of the work surface is entirely covered by a protective film 56 of dense polymer, generally liquid-tight and having a permeability to a gaseous cleaning agent.
• an intermediate layer 58 forming a gas distribution network.
• This is for example a rigid polymer polymer with open pores or a polymer woven (sieve type).
• the reference sign 60 designates an inlet manifold (shown in dotted lines) which extends over the entire width of the intermediate layer 58 and over its thickness.
• Reference sign 61 designates a gas supply pipe with a tap, which allows the selective introduction of cleaning gas into the intermediate layer.
• the supply pipe 61 terminates in a coupling which cooperates with an inlet manifold connector 60, which makes it possible to separate the two connections and thus to disconnect the gas source, which is required only when the it is desired to operate a cleaning of the work surface.
• the inlet manifold is optionally an outlet manifold 64 similar to the inlet manifold 60.
• a valve (not shown) is associated with the outlet manifold and allows, if necessary, to communicate intermediate layer with outside, for example in the event of a purge. This valve is generally closed so that all of the gas introduced via the inlet manifold 60 flows towards the front face of the protective film.
• Figure 6 relates to an application of the invention to water network systems.
• the reference sign 20 designates a pipe whose wall 22 carries on its inner face 22.1 the protective film 26.
• splines 28 'allow the distribution of the gaseous cleaning agent to the gasket.
• the fluid flowing in the internal passage 24 of the pipe 20 is in contact with the protective film 26 and its surface can be kept clean by injection of the gaseous cleaning agent.
• Such a pipe provided with an anti-settling wall can be used for water supply in general, and finds a particularly interesting application for the supply of ultra-clean water.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Combustion & Propulsion (AREA)
• Chemical & Material Sciences (AREA)
• Water Supply & Treatment (AREA)
• Public Health (AREA)
• Health & Medical Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Life Sciences & Earth Sciences (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)

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• 2017
  • 2017-11-07 FR FR1760452A patent/FR3073277B1/fr active Active
• 2018
  • 2018-11-06 ES ES18796673T patent/ES2942747T3/es active Active
  • 2018-11-06 WO PCT/EP2018/080290 patent/WO2019091960A1/fr unknown
  • 2018-11-06 EP EP18796673.4A patent/EP3707456B1/de active Active

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