EP1208344B1 - Heating element for a regenerative heat exchanger and method for producing a heating element - Google Patents

Heating element for a regenerative heat exchanger and method for producing a heating element Download PDF

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Publication number
EP1208344B1
EP1208344B1 EP00953171A EP00953171A EP1208344B1 EP 1208344 B1 EP1208344 B1 EP 1208344B1 EP 00953171 A EP00953171 A EP 00953171A EP 00953171 A EP00953171 A EP 00953171A EP 1208344 B1 EP1208344 B1 EP 1208344B1
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EP
European Patent Office
Prior art keywords
heating element
fluoroplastic
heat exchanger
regenerative heat
enamelled
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.)
Expired - Lifetime
Application number
EP00953171A
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German (de)
French (fr)
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EP1208344A1 (en
Inventor
Hermann MÜLLER-ODENWALD
Friedrich Weyland
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Alstom SA
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Alstom SA
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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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular 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
    • 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
    • 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
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F28D19/044—Rotors; Assemblies of heat absorbing masses shaped in sector form, e.g. with baskets
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/905—Materials of manufacture
    • 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
    • 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
    • Y10T29/49357—Regenerator or recuperator making
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • 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
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
    • Y10T428/31645—Next to addition polymer from unsaturated monomers
    • Y10T428/31649—Ester, halide or nitrile of addition polymer

Definitions

  • the invention relates to a profiled steel sheet designed as a heating element for a A regenerative heat exchanger.
  • Such heating elements are well known.
  • the storage mass of the regenerative heat exchanger The heat transfer required storage mass is when used in corrosive and / or dusty Gas streams subjected to special operational demands. This is true Example of the storage mass on the cold side of air preheaters to where the Temperature of the storage mass at least temporarily below the sulfuric acid dew point and forms corrosive deposits in connection with flue dust.
  • gas preheaters for reheating of clean gases from flue gas scrubbers where in addition to acid and dust sorbents or neutralizers and products deposit the flue gas cleaning system on the heating surfaces, similar problems occur on.
  • the storage mass must therefore be sufficiently resistant to corrosion and the deposits should be as easy as possible to clean off by blowing or rinsing.
  • For such applications are storage masses of enameled sheet steel profiles or storage materials become known from plastic (DE 32 07 213 C2).
  • Enamelled steel sheets have the disadvantage that enamel against acids such Sulfuric acid and hydrochloric acid is relatively well resistant, against those in flue gases too occurring hydrofluoric acid but is unstable and also a basic attack to Example by precipitation of neutralizing agents (additives or sorbents) for binding acidic gases, does not resist long enough and covers because of the relative good wettability of enamel more or less firmly adhere.
  • Memory material off inexpensive plastic has proven only conditionally. In consequence of the complex stress (Thermal cycling, chemical attack) embrittles the Material too fast and will be damaged. Because of the relatively low mechanical strength Also, plastic storage media can not work with the usual blas- or Flushing pressures are cleaned. Another disadvantage is the low heat storage capacity and thermal conductivity of plastics, resulting in the use of plastics as storage material is thermally unfavorable and by larger storage masses must be compensated.
  • PTFE fluoroplastic
  • a layer thickness of 10 to 50 microns is chosen because about up to this Layer thickness, the PTFE can be applied in one operation.
  • the enamel layer is in acid-resistant form executed.
  • a thin layer of fluoroplastic from For example, 10 to 50 microns thickness without special pretreatment of the enamel surface sufficiently well on the email liable.
  • the fluoroplastic coating can be built up in one or more layers become.
  • the enameled and fluoroplastic coated heating element profiles can be on especially economical way to represent a storage mass that is corrosion resistant and dirt-repellent and no thermotechnical and constructive disadvantages or with regard to the mode of operation, since those relating to heat exchange, Pressure loss and mechanical stability optimized and proven sheet steel profiles can be used and the thin fluoroplastic layer, the heat transfer performance only insignificantly (practically not) influenced.
  • Another Advantage of the inventive method is that the fluoroplastic coating with the for enamelling of Schublechen usual facilities can be done and thus for the production no additional equipment and facilities are necessary.
  • the dirt-repellent property of the inventive Schuelementprofile reduced or even completely prevents the build-up of pressure loss increasing dirt layers on the profiles. This brings operational benefits, because then the intervals for the necessary to achieve the maximum allowable pressure loss cleaning the Storage mass can be extended and thus smaller amounts of wastewater attack. If deposits are formed anyway, they will adhere less to fluoroplastic firmly and can be with less blowing or rinsing pressure / and therefore with lower Clean quantities of blowing medium and rinse water.
  • the lowest possible flue gas outlet temperature (temperature of the flue gas after flowing through the heat exchanger) and therefore also the lowest possible cold end temperature of the heat exchanger is sought in air preheaters.
  • dusty flue gases were previously set because of too fast formation of deposits and poor cleanability limits.
  • inventive dirt-repellent Schublechprofilen a deposit formation is prevented at extreme dew point below or it is at least better controllable, which ultimately allows a better reduction of the flue gas temperature.
  • a lower flue gas temperature means a higher boiler efficiency and thus a lower CO 2 emission and the downstream of the air preheater plants (electrostatic precipitator, flue gas cleaning system) can be built smaller.
  • SCR-De NOx Nitrogen oxides
  • a heating element consists of a steel sheet, which after its profiling by Degreasing or pickling is prepared for enameling. After enamelling with an acid-resistant enamel is without pretreatment of enamelled surface the fluoroplastic (eg PTFE) in a layer thickness of 10 to 50 microns, for example by spraying, applied, dried and tempered.
  • the Adhesive force can be a roughening of the before applying the fluoroplastic coating Enamel surface, for example, by light sandblasting, pickling with hydrofluoric acid or a base done.
  • the coating can be applied in one or more layers. After a preferred Embodiment will be particularly good on the enamel without pretreatment adhering fluoropolymer primer and then applied a fluoropolymer topcoat.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Resistance Heating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
  • Paints Or Removers (AREA)

Abstract

A heating element is described for a regenerative heat exchanger that is constructed as a profiled steel sheet. The aim of the invention is to produce a heating element that is resistant to acids, has anti-soiling properties and, however, has a good thermal output. To these ends, the heating element is provided with an enameling, and a fluoroplastic coating is applied to the enameled surface.

Description

Die Erfindung betrifft ein als profiliertes Stahlblech ausgebildetes Heizelement für einen Regenerativ-Wärmetauscher.The invention relates to a profiled steel sheet designed as a heating element for a A regenerative heat exchanger.

Derartige Heizelemente sind allgemein bekannt. Eine Vielzahl von Heizelementen bilden die Speichermasse des Regenerativ-Wärmetauschers. Die zur Wärmeübertragung benötigte Speichermasse ist beim Einsatz in korrosiven und/oder staubhaltigen Gasströmen besonderen betrieblichen Beanspruchungen unterworfen. Dies trifft zum Beispiel für die Speichermasse auf der kalten Seite von Luftvorwärmern zu, wo die Temperatur der Speichermasse zumindest zeitweise unterhalb des Schwefelsäuretaupunktes liegt und sich in Verbindung mit Flugstaub korrosive Beläge bilden. In Gasvorwärmern zur Wiederaufheizung von Reingasen aus Rauchgaswäschern, wo sich zusätzlich zu Säure und Staub Sorptions-oder Neutralisationsmittel und Produkte aus der Rauchgasreinigungsanlage auf den Heizflächen ablagern, treten ähnliche Probleme auf. Die Speichermasse muß deshalb hinreichend korrosionsfest sein und die Beläge sollen möglichst leicht durch Blasen oder Spülen abzureinigen sein. Für solche Anwendungen sind Speichermassen aus emaillierten Stahlblechprofilen oder Speichermaterialien aus Kunststoff bekannt geworden (DE 32 07 213 C2). Such heating elements are well known. To form a variety of heating elements the storage mass of the regenerative heat exchanger. The heat transfer required storage mass is when used in corrosive and / or dusty Gas streams subjected to special operational demands. This is true Example of the storage mass on the cold side of air preheaters to where the Temperature of the storage mass at least temporarily below the sulfuric acid dew point and forms corrosive deposits in connection with flue dust. In gas preheaters for reheating of clean gases from flue gas scrubbers, where in addition to acid and dust sorbents or neutralizers and products deposit the flue gas cleaning system on the heating surfaces, similar problems occur on. The storage mass must therefore be sufficiently resistant to corrosion and the deposits should be as easy as possible to clean off by blowing or rinsing. For such applications are storage masses of enameled sheet steel profiles or storage materials become known from plastic (DE 32 07 213 C2).

Emaillierte Stahlbleche haben den Nachteil, daß Email zwar gegen Säuren wie Schwefelsäure und Salzsäure relativ gut beständig ist, gegen die in Rauchgasen auch vorkommende Flusssäure aber unbeständig ist und auch einen basischen Angriff zum Beispiel durch Niederschläge von Neutralisationsmitteln (Additive oder Sorptionsmittel) zur Bindung saurer Gase, nicht hinreichend lang widersteht und Beläge wegen der relativ guten Benetzbarkeit von Email mehr oder weniger fest haften. Speichermaterial aus preiswertem Kunststoff hat sich nur bedingt bewährt. In Folge der komplexen Beanspruchung (Temperaturwechselbeanspruchung, chemischer Angriff) versprödet das Material zu schnell und wird schadhaft. Wegen der relativ geringen mechanischen Festigkeit können Speichermassen aus Kunststoff auch nicht mit den üblichen Blas-oder Spüldrücken abgereinigt werden. Ein weiterer Nachteil ist die geringe Wärmespeicherkapazität und Wärmeleitfähigkeit von Kunststoffen, was beim Einsatz von Kunststoffen als Speichermaterial wärmetechnisch ungünstig ist und durch größere Speichermassen ausgeglichen werden muß.Enamelled steel sheets have the disadvantage that enamel against acids such Sulfuric acid and hydrochloric acid is relatively well resistant, against those in flue gases too occurring hydrofluoric acid but is unstable and also a basic attack to Example by precipitation of neutralizing agents (additives or sorbents) for binding acidic gases, does not resist long enough and covers because of the relative good wettability of enamel more or less firmly adhere. Memory material off inexpensive plastic has proven only conditionally. In consequence of the complex stress (Thermal cycling, chemical attack) embrittles the Material too fast and will be damaged. Because of the relatively low mechanical strength Also, plastic storage media can not work with the usual blas- or Flushing pressures are cleaned. Another disadvantage is the low heat storage capacity and thermal conductivity of plastics, resulting in the use of plastics as storage material is thermally unfavorable and by larger storage masses must be compensated.

Um das Problem der Versprödung und Alterung von Kunststoff zu umgehen, wurden spezielle, aus der DE 195 12 351 C1 bekannte Speichermaterialien aus Fluorpolymeren wie PTFE vorgeschlagen. Fluorpolymere sind nahezu chemisch inert und haben bekannterweise einen weiteren Vorteil besonders schmutzabweisend zu sein. Das Material ist im Vergleich zu emaillierten Stahlblechen aber deutlich teurer und läßt sich wirtschaftlich nicht in beliebiger Form und Abmessung herstellen. Aus diesen Gründen beschränkt sich der Einsatz von Speichermassen, die voll aus Fluorkunststoffen bestehen, auf Anwendungen als Kaltendlage mit Lagenhöhe von zirka 300 mm, was zusätzliche Behälter mit Speichermasse und damit konstruktiven Mehraufwand notwendig macht. Außerdem haben Fluorkunststoffe auch den Nachteil der geringen Wärmespeicherkapazität und Wärmeleitfähigkeit und können wirtschaftlich nicht in für den Wärmeübergang günstiger Profilform dargestellt werden. To circumvent the problem of embrittlement and aging of plastic have been special, known from DE 195 12 351 C1 storage materials of fluoropolymers as PTFE suggested. Fluoropolymers are almost chemically inert and have known to be another advantage especially dirt-repellent. The Material is in comparison to enamelled steel sheets but significantly more expensive and can be not economically produce in any shape and dimension. For these reasons limited the use of storage masses, which are made entirely of fluoroplastics, For applications as cold end layer with layer height of about 300 mm, which additional Container with storage mass and thus additional design effort necessary power. In addition, fluoroplastics also have the disadvantage of low heat storage capacity and thermal conductivity and can not be economically in for heat transfer favorable profile shape are presented.

Es stellt sich die Aufgabe ein Heizelement der eingangs genannten Art anzugeben, das auch gegen Flusssäure beständig ist, schmutzabweisende Eigenschaften hat und trotzdem eine gute Wärmespeicherkapazität beziehungsweise Wärmeleitfähigkeit aufweist.It has as its object to provide a heating element of the type mentioned, the Also resistant to hydrofluoric acid, has dirt-repellent properties and nevertheless has a good heat storage capacity or thermal conductivity.

Gelöst wird diese Aufgabe erfindungsgemäß durch die im Anspruch 1 angegebenen Merkmale.This object is achieved according to the invention by the specified in claim 1 Characteristics.

Mit der Emaillierung wird ein Korrosionsschutz erzeugt. Die Permeabilität des Fluorkunststoffes (PTFE) ist daher nicht von so großer Bedeutung, so daß eine dünne PTFE-Beschichtung ausreicht. Sie gewährleistet die antiadhäsiven Eigenschaften und beeinflußt aufgrund der geringen Schichtdicke die Wärmespeicherkapazität und die Wärmeleitfähigkeit nur unwesentlich.Enamelling produces corrosion protection. The permeability of the fluoroplastic (PTFE) is therefore not of such importance, so that a thin PTFE coating is sufficient. It provides anti-adhesive properties and influenced due to the small layer thickness, the heat storage capacity and the Thermal conductivity only insignificant.

Vorzugsweise wird eine Schichtdicke von 10 bis 50 µm gewählt, da etwa bis zu dieser Schichtdicke das PTFE in einem Arbeitsgang aufgebracht werden kann.Preferably, a layer thickness of 10 to 50 microns is chosen because about up to this Layer thickness, the PTFE can be applied in one operation.

Zur Erhöhung des Korrosionsschutzes ist die Emailschicht in säurefester Ausbildung ausgeführt.To increase the corrosion protection, the enamel layer is in acid-resistant form executed.

Ein Verfahren zur Herstellung eines Heizelementes nach Anspruch 1 zeichnet sich durch folgende Schritte aus

  • a. Stahlcoils werden mit Hilfe von Profilwalzen profiliert und daraus entsprechend der geforderten Maße Heizelemente zugeschnitten,
  • b. das Heizelement wird emailliert und
  • c. der Fluorkunststoff wird aufgebracht.
    • A method for producing a heating element according to claim 1 is characterized by the following steps
  • a. Steel coils are profiled with the aid of profile rollers and from these are cut to size according to the required dimensions,
  • b. the heating element is enamelled and
  • c. the fluoroplastic is applied.

    • Es hat sich überraschend gezeigt, daß eine dünne Schicht von Fluorkunststoff von beispielsweise 10 bis 50 µm Dicke ohne besondere Vorbehandlung der Emailoberfläche hinreichend gut auf dem Email haftet.It has surprisingly been found that a thin layer of fluoroplastic from For example, 10 to 50 microns thickness without special pretreatment of the enamel surface sufficiently well on the email liable.

    Zur Verbesserung der Haftung kann eine Aufrauhung der Emailschicht vorgenommen werden.To improve the adhesion, a roughening of the enamel layer can be made become.

    Grundsätzlich kann die Fluorkunststoff-Beschichtung ein- oder mehrlagig aufgebaut werden.In principle, the fluoroplastic coating can be built up in one or more layers become.

    Mit den emaillierten und fluorkunststoffbeschichteten Heizelementprofilen läßt sich auf besonders wirtschafltiche Weise eine Speichermasse darstellen, die korrosionsfest und schmutzabweisend ist und keine wärmetechnischen und konstruktiven Nachteile oder Einschränkungen hinsichtlich der Betriebsweise aufweist, da die bezüglich Wärmetausch, Druckverlust und mechanischer Stabilität optimierten und bewährten Stahlblechprofile eingesetzt werden können und die dünne Fluorkunststoffschicht die Wärmeübertragungsleistung nur unwesentlich (praktisch nicht) beeinflußt. Ein weiterer Vorteil des erfinderischen Verfahrens ist, daß die Fluorkunststoffbeschichtung mit den zum Emaillieren von Heizblechen üblichen Einrichtungen erfolgen kann und somit für die Herstellung keine zusätzlichen Apparate und Einrichtungen notwendig sind.With the enameled and fluoroplastic coated heating element profiles can be on especially economical way to represent a storage mass that is corrosion resistant and dirt-repellent and no thermotechnical and constructive disadvantages or with regard to the mode of operation, since those relating to heat exchange, Pressure loss and mechanical stability optimized and proven sheet steel profiles can be used and the thin fluoroplastic layer, the heat transfer performance only insignificantly (practically not) influenced. Another Advantage of the inventive method is that the fluoroplastic coating with the for enamelling of Heizblechen usual facilities can be done and thus for the production no additional equipment and facilities are necessary.

    Die schmutzabweisende Eigenschaft der erfinderischen Heizelementprofile vermindert oder verhindert sogar ganz den Aufbau von druckverlusterhöhenden Verschmutzungsschichten auf den Profilen. Das bringt betriebliche Vorteile, weil dann die Intervalle für die bei Erreichen des maximal zulässigen Druckverlustes notwendigen Reinigungen der Speichermasse verlängert werden können und damit auch geringere Mengen an Abwasser anfallen. Bilden sich trotzdem Beläge, so haften diese auf Fluorkunststoff weniger fest an und lassen sich mit geringerem Blas-oder Spüldruck/und daher mit geringeren Mengen an Blasmedium und Spülwasser reinigen.The dirt-repellent property of the inventive Heizelementprofile reduced or even completely prevents the build-up of pressure loss increasing dirt layers on the profiles. This brings operational benefits, because then the intervals for the necessary to achieve the maximum allowable pressure loss cleaning the Storage mass can be extended and thus smaller amounts of wastewater attack. If deposits are formed anyway, they will adhere less to fluoroplastic firmly and can be with less blowing or rinsing pressure / and therefore with lower Clean quantities of blowing medium and rinse water.

    Aus Gründen der besseren Wirtschaftlichkeit einer Kesselanlage wird bei Luftvorwärmern eine möglichst tiefe Rauchgasaustrittstemperatur (Temperatur des Rauchgases nach Durchströmen des Wärmetauschers) und damit auch eine möglichst tiefe Kaltendtemperatur des Wärmetauschers angestrebt. Bei staubhaltigen Rauchgasen waren bisher wegen zu schneller Belagsbildung und schlechter Abreinigbarkeit die Grenzen gesetzt. Mit den erfinderischen schmutzabweisenden Heizblechprofilen wird eine Belagsbildung bei extremer Taupunktunterschreitung verhindert oder sie ist zumindest besser beherrschbar, was letztlich eine bessere Absenkung der Rauchgastemperatur zuläßt. Eine tiefere Rauchgastemperatur bedeutet einen höheren Kesselwirkungsgrad und damit eine geringere CO2-Emission und die dem Luftvorwärmer nachgeschalteten Anlagen (Elektrofilter, Rauchgasreinigungsanlage) können kleiner gebaut werden.For reasons of better economy of a boiler system, the lowest possible flue gas outlet temperature (temperature of the flue gas after flowing through the heat exchanger) and therefore also the lowest possible cold end temperature of the heat exchanger is sought in air preheaters. In dusty flue gases were previously set because of too fast formation of deposits and poor cleanability limits. With the inventive dirt-repellent Heizblechprofilen a deposit formation is prevented at extreme dew point below or it is at least better controllable, which ultimately allows a better reduction of the flue gas temperature. A lower flue gas temperature means a higher boiler efficiency and thus a lower CO 2 emission and the downstream of the air preheater plants (electrostatic precipitator, flue gas cleaning system) can be built smaller.

    Auch bei Regenerativ-Wärmetauschern an Anlagen zur selektiven Reduktion von Stickoxiden (SCR-De NOx) lassen sich die auf der heißen Lage beziehungsweise Mittellage bildenden Beläge von Ammoniumsulfaten mit der erfindungsgemäßen Beschichtungskombination leichter abreinigen.Also in regenerative heat exchangers to plants for the selective reduction of Nitrogen oxides (SCR-De NOx) can be applied to the hot layer or middle layer forming deposits of ammonium sulfates with the coating combination according to the invention easier to clean.

    Anhand eines Ausführungsbeispieles wird ein erfindungsgemäßes Heizelement und ein Verfahren zur Herstellung des Heizelementes beschrieben.Based on an embodiment, a heating element according to the invention and a Method for producing the heating element described.

    Ein Heizelement besteht aus einem Stahlblech, das nach seiner Profilierung durch Entfetten oder Beizen für die Emaillierung vorbereitet wird. Nach erfolgter Emaillierung mit einem säurebeständigen Email wird ohne Vorbehandlung der emaillierten Oberfläche der Fluorkunststoff (z. B. PTFE) in einer Schichtstärke von 10 bis 50 µm, zum Beispiel durch Aufsprühen, aufgebracht, getrocknet und getempert. Zur Verbesserung der Haftkraft kann vor dem Aufbringen der Fluorkunststoffbeschichtung ein Aufrauhen der Emailoberfläche zum Beispiel durch leichtes Sandstrahlen, Beizen mit Flusssäure oder einer Base erfolgen.A heating element consists of a steel sheet, which after its profiling by Degreasing or pickling is prepared for enameling. After enamelling with an acid-resistant enamel is without pretreatment of enamelled surface the fluoroplastic (eg PTFE) in a layer thickness of 10 to 50 microns, for example by spraying, applied, dried and tempered. To improve the Adhesive force can be a roughening of the before applying the fluoroplastic coating Enamel surface, for example, by light sandblasting, pickling with hydrofluoric acid or a base done.

    Die Beschichtung kann ein- oder mehrlagig aufgebracht werden. Nach einer bevorzugten Ausführungsform wird auf das Email ohne Vorbehandlung eine besonders gut haftende Fluorpolymergrundierung und darauf eine Fluorpolymerdeckschicht aufgebracht.The coating can be applied in one or more layers. After a preferred Embodiment will be particularly good on the enamel without pretreatment adhering fluoropolymer primer and then applied a fluoropolymer topcoat.

    Claims (6)

    1. A heating element for a regenerative heat exchanger, which is constructed as a profiled steel plate and is enamelled, characterised in that the enamelled surface is provided with a coating of fluoroplastic.
    2. A heating element according to Claim 1, characterised in that the fluoroplastic coating has a layer thickness of 10 to 50 µm.
    3. A heating element according to Claim 1, characterised in that the enamelled surface is constructed to be acid-resistant.
    4. A process for manufacturing a heating element for regenerative heat exchangers according to Claim 1, characterised in that steel coils are profiled with the aid of profiling rollers and the heating element is cut therefrom according to the required size, in that the steel plate is enamelled and in that the fluoroplastic coating is applied.
    5. A process according to Claim 4, characterised in that the enamelled surface of the steel plate is roughened.
    6. A process according to Claim 4, characterised in that the fluoroplastic coating is applied in one or more layers.
    EP00953171A 1999-08-27 2000-08-17 Heating element for a regenerative heat exchanger and method for producing a heating element Expired - Lifetime EP1208344B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19940627A DE19940627A1 (en) 1999-08-27 1999-08-27 Heating element for a regenerative heat exchanger and method for producing a heating element
    DE19940627 1999-08-27
    PCT/EP2000/008018 WO2001016545A1 (en) 1999-08-27 2000-08-17 Heating element for a regenerative heat exchanger and method for producing a heating element

    Publications (2)

    Publication Number Publication Date
    EP1208344A1 EP1208344A1 (en) 2002-05-29
    EP1208344B1 true EP1208344B1 (en) 2003-02-19

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00953171A Expired - Lifetime EP1208344B1 (en) 1999-08-27 2000-08-17 Heating element for a regenerative heat exchanger and method for producing a heating element

    Country Status (19)

    Country Link
    US (1) US6648061B2 (en)
    EP (1) EP1208344B1 (en)
    JP (1) JP2003508715A (en)
    KR (1) KR100632452B1 (en)
    CN (1) CN1148561C (en)
    AT (1) ATE232965T1 (en)
    AU (1) AU6571100A (en)
    BR (1) BR0013580A (en)
    CA (1) CA2391837C (en)
    CZ (1) CZ293669B6 (en)
    DE (2) DE19940627A1 (en)
    DK (1) DK1208344T3 (en)
    ES (1) ES2190981T3 (en)
    IL (1) IL148160A0 (en)
    MX (1) MXPA02001209A (en)
    PL (1) PL195191B1 (en)
    TR (1) TR200200481T2 (en)
    TW (1) TW448287B (en)
    WO (1) WO2001016545A1 (en)

    Families Citing this family (8)

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    DE10320462B3 (en) * 2003-05-08 2005-03-03 Alstom Power Energy Recovery Gmbh Heating element for a regenerative heat exchanger and method for producing a heating element
    DE102004023027A1 (en) * 2004-05-06 2005-12-08 Babcock Borsig Service Gmbh Corrosion protection process for heat exchanger, involves forming coating layer made of fluoroplastic to cover pipes or parts of heat exchanger, and heating base layer of heat exchanger to melt coating layer into purified or fine dust form
    JP4464796B2 (en) * 2004-11-15 2010-05-19 日立アプライアンス株式会社 Heat exchanger and manufacturing method thereof
    DE102008030733A1 (en) 2008-06-27 2009-12-31 Munters Euroform Gmbh Plate packet for cold end coating of regenerative gas preheater, has plates alternatively arranged in packet such that retaining slots extend from upper longitudinal edge and lower longitudinal edge of plates
    DE102009006855A1 (en) 2008-11-04 2010-05-06 Munters Euroform Gmbh Plate package for cold end layer
    DE102009008593A1 (en) * 2009-02-12 2010-08-19 Robert Bosch Gmbh Heat exchanger for use in e.g. oil condensing boilers for heat exchange between hot gas and boiler water, has coating consisting of plastic, which is processed in form of powder coating or in fluid phase
    DE102012203278A1 (en) 2012-03-01 2013-09-05 Sgl Carbon Se Rotary heat exchanger with heat exchanger plates or heat exchanger tubes made of carbon and graphite materials
    CN108444131A (en) * 2018-04-09 2018-08-24 杨厚成 A kind of regenerator and its manufacturing method, acoustic energy refrigeration machine and the course of work for acoustic energy refrigeration machine

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    Also Published As

    Publication number Publication date
    US20020108245A1 (en) 2002-08-15
    CN1148561C (en) 2004-05-05
    KR20020053805A (en) 2002-07-05
    PL195191B1 (en) 2007-08-31
    KR100632452B1 (en) 2006-10-09
    CN1371465A (en) 2002-09-25
    DK1208344T3 (en) 2003-06-10
    BR0013580A (en) 2002-04-30
    IL148160A0 (en) 2002-09-12
    CA2391837C (en) 2007-06-26
    CA2391837A1 (en) 2001-03-08
    CZ2002584A3 (en) 2002-09-11
    DE19940627A1 (en) 2001-03-01
    EP1208344A1 (en) 2002-05-29
    TW448287B (en) 2001-08-01
    US6648061B2 (en) 2003-11-18
    TR200200481T2 (en) 2002-06-21
    DE50001304D1 (en) 2003-03-27
    AU6571100A (en) 2001-03-26
    ATE232965T1 (en) 2003-03-15
    PL352370A1 (en) 2003-08-25
    JP2003508715A (en) 2003-03-04
    MXPA02001209A (en) 2004-10-15
    CZ293669B6 (en) 2004-06-16
    ES2190981T3 (en) 2003-09-01
    WO2001016545A1 (en) 2001-03-08

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