EP2184115B1 - Hydrophobe Beschichtung von Kondensatoren im eingebauten Zustand - Google Patents

Hydrophobe Beschichtung von Kondensatoren im eingebauten Zustand Download PDF

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Publication number
EP2184115B1
EP2184115B1 EP09174287A EP09174287A EP2184115B1 EP 2184115 B1 EP2184115 B1 EP 2184115B1 EP 09174287 A EP09174287 A EP 09174287A EP 09174287 A EP09174287 A EP 09174287A EP 2184115 B1 EP2184115 B1 EP 2184115B1
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EP
European Patent Office
Prior art keywords
condenser
coating
condenser tube
hydrophobic coating
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09174287A
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German (de)
English (en)
French (fr)
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EP2184115A1 (de
Inventor
Detlef Haje
Tobias Jockenhoevel
Heinrich Zeininger
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Siemens AG
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Siemens AG
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Publication date
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Priority to PL09174287T priority Critical patent/PL2184115T3/pl
Publication of EP2184115A1 publication Critical patent/EP2184115A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • 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
    • F28F13/182—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing especially adapted for evaporator or condenser surfaces
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2254/00—Tubes
    • B05D2254/02—Applying the material on the exterior of the tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • 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
    • F28F2245/04—Coatings; Surface treatments hydrophobic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49377—Tube with heat transfer means

Definitions

  • the present invention relates to a method for producing a condenser for a thermal power plant. Furthermore, the invention relates to a device for coating a built-in condenser tube with a hydrophobic coating.
  • a steam turbine In a steam turbine, the total enthalpy of a water vapor is exploited to convert a thermal energy, such as nuclear energy, coal or other energy sources, into mechanical energy.
  • a thermal energy such as nuclear energy, coal or other energy sources
  • steam is supplied from a liquid working medium, such as water, in a steam generator and fed to a turbine.
  • an enthalpy difference of the steam can be used to generate mechanical energy.
  • a condenser or a steam condenser Downstream of the turbine, a condenser or a steam condenser is arranged to provide an isobaric condensation of the water vapor.
  • vapor condensation surface capacitors for steam turbine plants wherein the surface capacitors have a plurality of uncoated capacitor tubes.
  • the condenser tubes which are filled with a cooling working medium, usually takes place a film condensation, so that the liquid vapor passes into a liquid state of matter.
  • the condenser tubes can be hydrophobic coated to provide a targeted transition from film condensation to dropwise condensation.
  • a droplet condensation By means of a droplet condensation, an increase in the heat transfer can be achieved, resulting in an improvement in the heat transfer coefficient about 20%. This in turn leads to an improvement of the efficiency of the capacitor (smaller Gr.technik) or to a reduction in the cost and space with the same Graderness.
  • DE 10 2007 008 038 A1 discloses a method by which heat exchanger tubes are sprayed with a hydrophobic layer.
  • the hydrophobic layer can be sprayed onto the condenser tubes via nozzles, wherein the nozzles have flexible feed lines and are arranged and fastened next to one another in an articulated chain.
  • the nozzles are attached to nozzle lances and can be pushed into a tube bundle.
  • the device has a clamping device which can be fastened and released on a support plate of the condenser tube bundle.
  • DE 10 2007 015 450 A1 discloses a coating for steam condensers.
  • This coating consists in particular of a hydrophobic coating.
  • the coating is applied by a sol-gel method.
  • GB 24 28 604 A discloses an antifouling coating on a heat exchanger.
  • a coating can be applied, for example, via a sol-gel process or via a dipping method.
  • a method for manufacturing a condenser for a thermal power plant is described.
  • a condenser tube is installed in a carrier for a condenser tube bundle of the condenser.
  • the built-in condenser tube is coated with a hydrophobic coating.
  • an apparatus for coating a built-in condenser tube having a hydrophobic coating according to the above-described manufacturing methods is provided.
  • the device has a spray head for coating the built-in condenser tube with the hydrophobic coating.
  • a condenser for a thermal power plant is provided.
  • the capacitor is manufactured by the method described above.
  • the condenser has a support with a built-in condenser tube, the built-in condenser tube having a hydrophobic coating.
  • condenser tube bundle may be understood to mean a condenser tube or a multiplicity of condenser tubes which are held in a carrier (condenser tube carrier) at a specific distance from one another and form a condenser tube unit or condenser tube bundle.
  • a water vapor to be cooled can impinge on a condenser tube bundle so that the water vapor can flow past the individual condenser tubes through the condenser tube bundle.
  • the carrier may further be configured to space the individual condenser tubes a defined distance so that the water vapor can flow between the condenser tubes and be cooled by the condenser tubes.
  • the carrier may for example consist of tube plates and retaining walls, which have holes and receiving units where the individual condenser tubes can be attached.
  • hydrophobic or “hydrophobic coating” can be understood as meaning a surface which is water-repellent or on which dropwise condensation can take place.
  • hydrophobic coating may in the following also be understood to mean a coating which has an oleophobic effect, that is to say which has an oil-repellent effect.
  • a hydrophobic coating has a contact angle with liquid drops of over 90 °. The contact angle can range up to 130 ° in hydrophobic coatings. With structured surfaces, a superhydrophobic effect can be achieved with a contact angle of greater than 130 ° or greater than 160 ° (degrees) (eg, Lotus effect).
  • the contact angle defines an angle between a surface of a coating and a vector tangent to a drop of liquid at the point of contact of the drop with a component surface.
  • a contact angle of more than 90 ° a droplet shape forms on a surface in the case of a water droplet, so that droplet condensation can be provided at a contact angle of more than 90 °.
  • capacitor tubes are coated prior to installation in the carrier and inserted after the coating in the carrier for the condenser tube bundle.
  • Hydrophobic coatings have sensitive properties such that they have a low abrasion resistance and a high risk of injury to the hydrophobic coatings on the condenser tubes during installation.
  • a coating of the condenser tubes with superhydrophobic layers may be particularly desirable, with such superhydrophobic layers being particularly sensitive to mechanical stress such that retrofitting of the coated condenser tubes results in a high risk of coating damage.
  • the coating can also be damaged by the attachment methods of the condenser tubes to the support of the condenser tube bundle.
  • Condenser tubes are welded to the carrier, for example, which can result in injury to the hydrophobic coating.
  • a high maintenance is necessary to retrofit hydrophobically coated condenser tubes by means of pipe replacement, so that long maintenance and set-up times exist.
  • a hydrophobic coating is applied to a built-in condenser tube.
  • the hydrophobic coating is applied to a capacitor tube already fixed in a condenser tube bundle.
  • the outer tubes of a condenser tube bundle contribute most to the condensation performance of the condenser. Therefore, the advantages of the invention can already be achieved by the outer condenser tubes are first installed in the carrier of the condenser tube bundle and coated in an installed state with the hydrophobic coating. Thus, at least the outer condenser tubes of the condenser tube bundle have a high quality hydrophobic coating.
  • the coating of the built-in condenser tube with the hydrophobic coating has at least one positioning of a spray device on the carrier or relative to the carrier.
  • a spraying of the hydrophobic coating is then provided in order to coat the built-in condenser tube with the hydrophobic coating.
  • the spray coating By means of the spray coating, a very thin and uniform application of the hydrophobic coating on the built-in condenser tube can be provided due to a very fine spray dust of the hydrophobic coating dimensions.
  • the step of coating the built-in condenser tube with the hydrophobic coating comprises moving the spraying device during spraying at a uniform feed along an extending direction of the built-in condenser tube.
  • a uniform spraying or coating of the installed condenser tube can be provided automatically. Irregularities in the spray application of the hydrophobic coating can occur due to an irregular manual feed, especially with manual application of a coating, so that different layer thicknesses are achieved on the condenser tube.
  • the spray device which provides a uniform feed, a predefined and uniform layer thickness of the hydrophobic coating can be provided so that predefined and improved capacitor effects of the condenser tube can be achieved.
  • a plurality of layers of the hydrophobic coating can be applied by repeated method with the uniform feed.
  • a hydrophobic coating may consist of 10, 12 or more sublayers.
  • a uniform feed orthogonal to the extension direction of the built-in condenser tube can be provided.
  • the capacitor is mounted on the thermal power plant during coating and, e.g. already in operation before the coating process.
  • the power plant operator can thus make a repair or a job of hydrophobic coating on the built-condenser tube without emptying the condenser tubes and thus with minimal effort. An expansion of the condenser tube and thus interrupting the operation of the capacitor can be avoided.
  • the built-in capacitor tube is coated with the hydrophobic coating by means of a spread coating.
  • a condenser tube can be coated in a simple and rapid manner by means of the hydrophobic coating.
  • coating brush devices can be used.
  • the spray device comprises a spray head, wherein coating the built-in condenser tube with the hydrophobic coating further comprises the step of introducing the spray head into the carrier to coat the built-in condenser tube with the hydrophobic coating.
  • the spray head in addition to the spraying of the outer condenser tubes of the condenser tube bundle, there is also provided a way to coat the inside of a condenser tube bundle.
  • the spray head can be introduced into the carrier in such a way that the spray head can be guided between the condenser tube spacings and thus can coat internal condenser tubes which, for example, have no direct connection to the conurbation of the condenser tube bundle.
  • concealed condenser tubes can be coated with the hydrophobic coating in the installed state, so that an expansion of these inner tubes also may not be necessary.
  • the spray device can be positioned on or in the carrier of the condenser tube bundle and provide a spray application of the coating by means of the uniform feed along the condenser tubes.
  • the step of coating the built-in condenser tube with the hydrophobic coating further comprises electroplating the built-in condenser tube.
  • electro-spray painting for example, the degree of coating can be improved by electrostatic effects.
  • the spray of the hydrophobic coating can be electrostatically charged during application, for example at 35kV (kilovolts), 40kV or 50kV, and sprayed onto grounded capacitor tubes.
  • the condenser tubes are connected to a ground potential.
  • the carrier of the condenser tube bundle may be a metallic conductor and thus be used as an electrically conductive structural component.
  • the condenser tubes themselves or the electrically conductive structural components can be provided with a connection to the ground (ground, ground potential).
  • the hydrophobic coating may be, for example, a voltage source be electrostatically charged.
  • the spray head may nevertheless deposit on the opposite side of the condenser tubes due to the electrostatic charge, so that a hydrophobic coating can also be provided at opposite points of the condenser tubes.
  • electrospraying by properly selecting the dosage of the hydrophobic coating, and with appropriate choice of feed or applied static stress, a predefined thin and uniform hydrophobic coating can be provided on the condenser tubes so that predefined hydrophobic properties can be provided on each of the condenser tubes.
  • the hydrophobic coating on the built-in condenser tube is crosslinked by means of UV curing, dual cure and / or thermal curing.
  • crosslinking can be understood as meaning a connection of the coating to a surface of the condenser tubes.
  • crosslinking may mean that the coating is firmly bonded to the surface of the condenser tubes. This is made possible for example by the fact that the molecules of the coating combine with the atoms / molecules of the condenser tube surface or that molecules of the coating intervene in cavities of the surface of the condenser tube and thus create a firm connection.
  • UV curing an ultraviolet (UV) light is irradiated in the direction of the coating by means of a UV emitter, so that crosslinking of the coating occurs due to the excitation of the molecules in the coating and due to the resulting temperature.
  • UV emitter In the case of UV curing, an ultraviolet (UV) light is irradiated in the direction of the coating by means of a UV emitter, so that crosslinking of the coating occurs due to the excitation of the molecules in the coating and due to the resulting temperature.
  • Another technology for crosslinking by means of UV curing is the dual-cure process, in which the curing is first initiated by UV radiation and then the hydrophobic coating is completely cured at room temperature, so that crosslinking takes place.
  • thermal cure describes crosslinking by curing due to the application of thermal energy.
  • the temperature ranges in the thermal curing can be between 50 ° C to 100 ° C or in the range between 100 ° C and 200 ° C or between 100 ° C to 250 ° C.
  • the thermal energy can be applied for example by means of radiant heaters, heating coils, resistance heaters or hot air blower.
  • the thermal energy can be achieved for curing by means of a heating fluid in the condenser tubes, so that no further thermal energy sources can be needed.
  • the working fluid in the condenser tubes can be drained to avoid adverse heat capacity of a fluid-filled tube.
  • X organic modification of the alkoxide
  • the coating is produced by hydrolysis and condensation of the metal alkoxides.
  • the organic modification of the metal oxide can affect the properties of the coating.
  • the hydrophobic side chains X e.g., alkyl chains, alkyl groups, fluoroalkyl chains, siloxane groups
  • the organic modification may have sufficient water vapor stability.
  • the described hydrophobic sol-gel based coating material can be further modified by the incorporation of surface treated nano- or microscale particles, for example, whereby the mechanical abrasion resistance or the corrosion resistance can be improved.
  • the hydrophobic sol-gel coatings can be applied to the substrate (condenser tube) in the sol-gel process, for example by wet chemical methods such as spraying, dipping, flooding, rolling or brushing.
  • the coatings are then thermally cured or crosslinked.
  • the temperature ranges of the crosslinking step described above can be used, but also a curing temperature in temperature ranges from room temperature up to 400 ° C (Celsius) are possible. A higher curing temperature above 400 ° C can lead to a vitreous layer, whereby the hydrophobic properties can be reduced.
  • a film thickness in a range of 100 nm (nanometers) to 100 ⁇ m (micrometers) can be achieved.
  • the hydrophobic coating on the built-in condenser tube can be applied by means of the sol-gel method such that, for example, the contact angle of the hydrophobic coating is 90 ° (degrees), 100 ° or 120 °.
  • the condenser is a steam condenser and the thermal power plant is a steam turbine plant.
  • the apparatus for coating a built-in condenser tube with the hydrophobic coating according to the manufacturing method described above has positioning means for positioning the device relative to the carrier of the condenser tube bundle. Furthermore, the device has a movement device for moving the spray head along and / or transversely to an extension direction of the condenser tube.
  • the positioning device may for example be an independent unit and be fixed relative to the carrier. On the other hand, the positioning device can be attached to the carrier itself and support the coating device.
  • the device for coating the built-in condenser tube may be, for example, the spraying device.
  • the coating apparatus has the spray head for coating the built-in condenser tube with the hydrophobic coating.
  • the spray head may, for example, consist of a nozzle which can apply the hydrophobic coating in a fine atomization on a surface of the condenser tubes.
  • the movement device can be movably connected to the positioning device and moved along a predefined linear movement direction, so that a uniform application of the hydrophobic coating to the condenser tubes can be provided by means of the spray head.
  • the spray head is set up such that the hydrophobic coating can be applied to the built-in condenser tube by means of electro-spray painting.
  • the spray head can be connected to a voltage source and thus electrostatically charge a spray of the hydrophobic coating.
  • the device for coating the built-in condenser tube has a connecting tube.
  • the connecting tube can connect the moving device and the spray head.
  • the connecting tube has a helical shape, wherein the pitch of the helical shape can be adapted to a condenser tube radius and to the condenser tube spacings of the condenser tubes in the condenser tube bundle.
  • the helix shape of the connecting tube describes a helical line, similar to a corkscrew.
  • the pitch of the helical shape can be predefined fixedly on condenser tube radii and on the condenser tube distances, and the spray head can be screwed or screwed in along the condenser tubes by rotation of the connecting tube.
  • the connecting tube can thus be adapted already during its manufacture firmly to the condenser tube radii and the condenser tube spacings.
  • the connecting tube may be made of an elastic material or deformable material, such as For example, rubber, be prepared so that during rotation, the connecting tube in the condenser tube bundle adjusts the connecting tube to the condenser tube radii and the condenser tube distances and thus forms the helical shape.
  • a way can be provided for coating an existing condenser tube bundle of a plurality of condenser tubes with a hydrophobic coating.
  • a hydrophobic coating Even inside condenser tubes of the condenser tube bundle can be coated with the hydrophobic coating. An expansion of the inside and thus hidden condenser tubes from the condenser tube bundle is thus no longer necessary to provide a hydrophobic coating of the condenser tubes.
  • the capacitor is designed as a heating capacitor.
  • a heating condenser can be understood to mean a condenser which is supplied with a higher vapor pressure in order to shift the condensation point of the vapor into higher temperature ranges.
  • the high vapor pressure in the heating condenser can be generated, for example, by taking high-pressure, high-temperature steam from a turbine stage of a thermal power plant and then supplying it to the heating condenser.
  • the Graedtechnik ie the temperature difference between a primary and secondary return temperature
  • the Graedtechnik ie the temperature difference between a primary and secondary return temperature
  • a slightly higher temperature of the heat transfer medium fluid of the district heating network
  • a smaller heat exchanger surface can be used at the same rate (cost and / or space savings), or the performance of an existing heat exchanger can be increased.
  • the condenser is designed as a high-pressure preheater or as a low-pressure preheater.
  • a low pressure preheater may be placed in front of a feed water tank and the working fluid (e.g., water) in condensed liquid state obtained from so-called condensate pumps.
  • the working fluid e.g., water
  • steam from the steam turbine can be used to remove pressurized steam and supply it to the low pressure preheater.
  • the temperature level of the working fluid is increased in the low-pressure preheater and thus also in the subsequent feed water tank. This increase in the temperature level increases the efficiency of the steam cycle in the thermal power plant.
  • an improvement / restoration of the function and / or a cost reduction and / or a power increase of the apparatus is achieved by means of the new solution.
  • a high-pressure preheater can be arranged between the feed water tank and the steam generator of the thermal power plant. Similar to the low-pressure preheater, the high-pressure preheater is supplied with a hot steam from the steam turbines that is under (higher) pressure. Thus, the energy level, in particular the temperature level, of the feed water entering the steam generator is increased. Thus, an efficiency of the steam cycle in the thermal power plant can be increased. Improvements in function, cost and / or performance can be achieved in a similar manner to the low pressure preheater.
  • this is used in the thermal power plant of a cogeneration plant.
  • a cogeneration plant generates electricity and heat using a cogeneration process.
  • the branched heat of the steam cycle in the heating power plant can be dissipated via the condenser (eg designed as a heating condenser) or another heat exchanger to a working medium of a district heating circuit.
  • the condenser eg designed as a heating condenser
  • the unused waste heat can thus be used in a district heating system for further use.
  • Fig. 1 shows an exemplary embodiment of a capacitor 100, such as a steam condenser 100, for a thermal power plant, such as a steam turbine plant.
  • the capacitor 100 can be coated with the described production method with a hydrophobic coating.
  • the capacitor 100 in this case has a carrier 105, in which built-in condenser tubes 101 are attached.
  • a built-in condenser tube 101 has a hydrophobic coating.
  • a condenser tube 101 is first installed in the carrier 105 for a condenser tube bundle 203 of the condenser 100.
  • the built-in condenser tube 101 is coated with a hydrophobic coating.
  • the carrier 105 may be used to support and fix each of the condenser tubes 101 so that the condenser tube bundle 203 may be provided from the plurality of fixed condenser tubes 101.
  • the condenser tube bundle 203 has outer condenser tubes 101 and inner condenser tubes 101, which have no contact with the surroundings of the condenser tube bundle 203.
  • the built-in condenser tubes 101 have a cooling fluid, for example cooling water, in order to provide condensation of the water vapor by cooling down a passing steam. Due to the hydrophobic coating of the built-in condenser tubes 101, there is also a dropwise condensation of the passing steam.
  • a cooling fluid for example cooling water
  • a hydrophobic coating can be applied to the condenser tubes 101 by means of the spraying device 106.
  • the condenser tubes 101 are already in an installed state on the carrier 105 when the hydrophobic coating is applied, so that a time-consuming expansion for coating the condenser tubes 101 is not necessary. Furthermore, it is avoided that the hydrophobic coating of a condenser tube 101 is damaged during its installation.
  • the spray device 106 may, for example, have a spray head 102 with which a hydrophobic coating can be sprayed onto the condenser tubes 101.
  • a defined spray cone 104 forms.
  • a curtain coating e.g. using brush devices, possible.
  • the spray head 102 can be moved along the longitudinal direction (extension direction) of the outer condenser tubes 101, so that at least the outer condenser tubes 101 can be charged with the hydrophobic coating. Furthermore, the spray head 102 of the spray device 106 may be made so small that the spray head 102 can be inserted between a condenser tube distance a. Thus, the spray device 106 may at least also coat the second row of the condenser tubes 101 in the condenser tube bundle 203 with a hydrophobic coating.
  • the spraying device 106 can have a connecting tube 103, so that all the inner condenser tubes 101 of the condenser tube bundle 203 can also be coated with the hydrophobic coating in an installed state.
  • the connecting tube 103 can have a helical shape (helix), wherein the pitch of the helical line can be selected such that the pitch adapts to the condenser tube radii r and to the condenser tube spacings a.
  • each inner condenser tube 101 can be coated by means of the hydrophobic coating.
  • Fig. 2 11 illustrates a plan view of built-in condenser tubes 101 in the condenser tube bundle 203.
  • the carrier 105 of the condenser tube bundles 203 has, for example, a condenser tube bottom 202 and a plurality of support walls 201 for supporting the condenser tubes 101.
  • the hydrophobic coating can be applied either along the longitudinal direction or along the transverse direction of the condenser tubes.
  • the spray device 106 may be applied to the hydrophobic coating either in one direction or alternately. Furthermore, the spraying device 106 can be moved along the longitudinal direction or the transverse direction of the condenser tubes 101.
  • the spray device 106 may move the spray head alternately or alternately in a direction along the extending direction of the condenser tubes 101 or along the transverse direction.
  • a mixture of both directions of movement is possible.
  • the spraying device 106 can be moved along a positioning device or a moving device and during the process, the spraying head 102 can rotate transversely relative to the direction of movement of the spraying device 106 or perform a pitching motion, so that a mixture of two spraying directions is made possible. This allows a rapid application of the hydrophobic coating.
  • Fig. 3 shows an exemplary embodiment of a structure for applying the hydrophobic coating by means of electro-spray painting.
  • the condenser tubes 101 or the carrier 105 can be electrically conductive and thus represent electrically conductive structural components 303. These electrically conductive Structural components 303 may be connected to a ground potential 302.
  • the spray device 106 and / or the spray head 102 are connected to a voltage source 301 so that the spray of the hydrophobic coating can be electrostatically charged, for example at 30kV, 40kV, 50kV or 60kV (kilovolts). Due to the grounded condenser tubes 101, the electrostatically charged spray of the hydrophobic coating is attracted, so that the spray evenly applied to the condenser tubes 101.
  • a built-in condenser tube 101 comprising the hydrophobic coating can be sprayed. Even if the spray head 102 applies the spray mist on one side of the condenser tube, the spray mist can be attracted to the opposite side of the condenser tube 101 due to the electrostatic attraction, so that the hydrophobic coating also deposits on the opposite side. Thus, even with poorly accessible condenser tubes 101 in the installed state, a uniform coating of the hydrophobic coating can be provided.
  • a condenser tube bundle 203 may be provided for a condenser 100 having built-in and hydrophobically coated condenser tubes 101. Due to the coating of the condenser tubes 101 in the installed state, the manufacturing process of the condenser tube bundle 203 can be accelerated since the coating process need not be performed individually for each condenser tube 101, but once for the entirety of the condenser tubes 101 installed. In addition, in the course of the maintenance of a capacitor 100 already mounted on the steam turbine plant and in operation, a coating of the condenser tubes 101 can be provided without the condenser tubes 101 having to be removed.
  • Damage to the hydrophobic coating which occurs when installing a condenser tube 101 in the carrier 105 of the condenser tube bundle 203, can also be avoided because the condenser tubes 101 are coated after the installation of the condenser tubes 101 in the carrier 105 of the condenser tube bundle 203 with the hydrophobic coating.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP09174287A 2008-11-10 2009-10-28 Hydrophobe Beschichtung von Kondensatoren im eingebauten Zustand Not-in-force EP2184115B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09174287T PL2184115T3 (pl) 2008-11-10 2009-10-28 Powłoka hydrofobowa kondensatorów w stanie zamontowanym

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DE102008056621A DE102008056621B4 (de) 2008-11-10 2008-11-10 Verfahren zur Herstellung eines Dampfkondensators, sowie Dampfkondensator für eine Dampfturbinenanlage und Vorrichtung zum Beschichten eines Kondensatorrohres

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WO2015153651A1 (en) 2014-03-31 2015-10-08 Trane International Inc. Phobic/philic structures in refrigeration systems and liquid vapor separation in refrigeration systems
CN107036337B (zh) * 2015-10-23 2021-03-02 开利公司 再生热交换器疏水性涂层的方法
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US8580351B2 (en) 2013-11-12
EP2184115A1 (de) 2010-05-12
PL2184115T3 (pl) 2013-08-30
US20100115950A1 (en) 2010-05-13
CN101786060A (zh) 2010-07-28
BRPI0905392A2 (pt) 2011-06-14
DE102008056621A1 (de) 2010-05-20
DE102008056621B4 (de) 2012-01-05

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