EP1208344A1 - 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

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Publication number
EP1208344A1
EP1208344A1 EP00953171A EP00953171A EP1208344A1 EP 1208344 A1 EP1208344 A1 EP 1208344A1 EP 00953171 A EP00953171 A EP 00953171A EP 00953171 A EP00953171 A EP 00953171A EP 1208344 A1 EP1208344 A1 EP 1208344A1
Authority
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.)
Granted
Application number
EP00953171A
Other languages
German (de)
French (fr)
Other versions
EP1208344B1 (en
Inventor
Hermann MÜLLER-ODENWALD
Friedrich Weyland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom SA
Original Assignee
ABB Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP1208344A1 publication Critical patent/EP1208344A1/en
Application granted granted Critical
Publication of EP1208344B1 publication Critical patent/EP1208344B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 heating element designed as a profiled sheet steel for a regenerative heat exchanger.
  • heating elements are generally known.
  • a large number of heating elements form the storage mass of the regenerative heat exchanger.
  • the storage mass required for heat transfer is subject to special operational stresses when used in corrosive and / or dust-containing gas streams. This applies, for example, to the storage mass on the cold side of air preheaters, where the temperature of the storage mass is at least temporarily below the sulfuric acid dew point and corrosive deposits form in connection with flying dust.
  • Similar problems occur in gas preheaters for reheating pure gases from flue gas scrubbers, where sorbents or neutralizing agents and products from the flue gas cleaning system are deposited on the heating surfaces in addition to acid and dust.
  • the storage mass must therefore be sufficiently corrosion-resistant and the deposits should be easy to clean by blowing or rinsing.
  • Enamelled steel sheets have the disadvantage that, although enamel is relatively resistant to acids such as sulfuric acid and hydrochloric acid, it is not resistant to the hydrofluoric acid that is also found in flue gases, and it also has a basic attack, for example due to the precipitation of neutralizing agents (additives or sorbents) to form acidic gases , does not withstand sufficiently long and coverings stick more or less firmly due to the relatively good wettability of enamel.
  • Storage material made of inexpensive plastic has only proven itself to a limited extent, as a result of the complex stress (thermal cycling, chemical attack) the material embrittles too quickly and becomes damaged.
  • plastic storage materials cannot be cleaned with the usual blowing or flushing pressures.
  • Another disadvantage is the low heat storage capacity and thermal conductivity of plastics, which is thermally unfavorable when using plastics as storage material and must be compensated for by larger storage masses.
  • fluoropolymers such as PTFE, known from DE 195 12 351 C1
  • Fluoropolymers are almost chemically inert and are known to have another advantage of being particularly dirt-repellent.
  • the material is significantly more expensive than enamelled steel sheets and cannot be economically produced in any shape and size.
  • fluoroplastics also have the disadvantage of low heat storage capacity and thermal conductivity and cannot be economically represented in a profile shape that is favorable for heat transfer. It is the task of specifying a heating element of the type mentioned at the outset which is also resistant to hydrofluoric acid, has dirt-repellent properties and nevertheless has good heat storage capacity or thermal conductivity.
  • Corrosion protection is created with the enamelling.
  • the permeability of the fluoroplastic (PTFE) is therefore not of great importance, so that a thin PTFE coating is sufficient. It ensures the anti-adhesive properties and, due to the small layer thickness, has only an insignificant influence on the heat storage capacity and the thermal conductivity.
  • a layer thickness of 10 to 50 ⁇ m is preferably selected, since up to this layer thickness the PTFE can be applied in one operation.
  • the enamel layer is designed to be acid-proof.
  • a method for producing a heating element according to claim 1 is characterized by the following steps
  • the enamel layer can be roughened.
  • the fluoroplastic coating can be built up in one or more layers.
  • a storage mass can be produced in a particularly economical manner, which is corrosion-resistant and dirt-repellent and has no thermal and structural disadvantages or restrictions in terms of operation, since the steel sheet profiles optimized and proven with regard to heat exchange, pressure loss and mechanical stability can be used and the thin fluoroplastic layer affects the heat transfer performance only insignificantly (practically not).
  • Another advantage of the method according to the invention is that the fluoroplastic coating can be carried out with the devices customary for enamelling heating plates and thus no additional apparatus and devices are necessary for the production.
  • the dirt-repellent property of the inventive heating element profiles reduces or even completely prevents the build-up of pressure loss-increasing layers of dirt on the profiles. This brings operational advantages because the intervals for the cleaning of the storage mass necessary when the maximum permissible pressure drop is reached can then be extended and thus smaller amounts of waste water are also generated. If deposits nevertheless form, they will stick to fluoroplastic ger firmly and can be cleaned with a lower blowing or flushing pressure / and therefore with smaller amounts of blowing medium and flushing water.
  • the lowest possible flue gas outlet temperature (temperature of the flue gas after flowing through the heat exchanger) and thus the lowest possible cold end temperature of the heat exchanger is aimed at in air preheaters.
  • the limits were previously limited due to the rapid build-up of deposits and poor cleanability.
  • the inventive dirt-repellent heating plate profiles prevent the formation of deposits when the temperature falls below the dew point or it is at least easier to control, which ultimately allows a better lowering of the flue gas temperature.
  • a lower flue gas temperature means a higher boiler efficiency and thus lower CO 2 emissions, and the systems downstream of the air preheater (electrostatic precipitator, flue gas cleaning system) can be built smaller.
  • a heating element according to the invention and a method for producing the heating element are described using an exemplary embodiment.
  • a heating element consists of a sheet steel, which, after being profiled, is prepared for the enamelling by degreasing or pickling.
  • the fluoroplastic e.g. PTFE
  • the enamel surface can be roughened, for example by light sandblasting, pickling with hydrofluoric acid or a base, before applying the fluoroplastic coating.
  • the coating can be applied in one or more layers.
  • a particularly well adhering fluoropolymer primer is applied to the enamel without pretreatment, and a fluoropolymer cover layer is applied thereon.

Landscapes

  • 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)
  • Paints Or Removers (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Containers And Plastic Fillers For Packaging (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

Heizelement für einen Regenerativ-Wärmetauscher und Verfahren zum Herstellen eines Heizelementes Heating element for a regenerative heat exchanger and method for producing a heating element
Beschreibungdescription
Die Erfindung betrifft ein als profiliertes Stahlblech ausgebildetes Heizelement für einen Regenerativ-Wärmetauscher.The invention relates to a heating element designed as a profiled sheet steel for 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 Wiederauf heizung von Reingasen aus Rauchgaswäschern, wo sich zusätzlich zu Säure und Staub Sorptions-oder Neutralisationsmitteln 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). 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 Bildung 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.Such heating elements are generally known. A large number of heating elements form the storage mass of the regenerative heat exchanger. The storage mass required for heat transfer is subject to special operational stresses when used in corrosive and / or dust-containing gas streams. This applies, for example, to the storage mass on the cold side of air preheaters, where the temperature of the storage mass is at least temporarily below the sulfuric acid dew point and corrosive deposits form in connection with flying dust. Similar problems occur in gas preheaters for reheating pure gases from flue gas scrubbers, where sorbents or neutralizing agents and products from the flue gas cleaning system are deposited on the heating surfaces in addition to acid and dust. The storage mass must therefore be sufficiently corrosion-resistant and the deposits should be easy to clean by blowing or rinsing. Storage compositions made from enamelled sheet steel profiles or storage materials made from plastic have become known for such applications (DE 32 07 213 C2). Enamelled steel sheets have the disadvantage that, although enamel is relatively resistant to acids such as sulfuric acid and hydrochloric acid, it is not resistant to the hydrofluoric acid that is also found in flue gases, and it also has a basic attack, for example due to the precipitation of neutralizing agents (additives or sorbents) to form acidic gases , does not withstand sufficiently long and coverings stick more or less firmly due to the relatively good wettability of enamel. Storage material made of inexpensive plastic has only proven itself to a limited extent, as a result of the complex stress (thermal cycling, chemical attack) the material embrittles too quickly and becomes damaged. Because of the relatively low mechanical strength, plastic storage materials cannot be cleaned with the usual blowing or flushing pressures. Another disadvantage is the low heat storage capacity and thermal conductivity of plastics, which is thermally unfavorable when using plastics as storage material and must be compensated for by larger storage masses.
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. 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.In order to avoid the problem of embrittlement and aging of plastic, special storage materials made of fluoropolymers such as PTFE, known from DE 195 12 351 C1, have been proposed. Fluoropolymers are almost chemically inert and are known to have another advantage of being particularly dirt-repellent. However, the material is significantly more expensive than enamelled steel sheets and cannot be economically produced in any shape and size. For these reasons, the use of storage masses that are made entirely of fluoroplastics is limited to cold-end applications with a layer height of approximately 300 mm, which makes additional containers with storage mass and thus additional design work necessary. In addition, fluoroplastics also have the disadvantage of low heat storage capacity and thermal conductivity and cannot be economically represented in a profile shape that is favorable for heat transfer. It is the task of specifying a heating element of the type mentioned at the outset which is also resistant to hydrofluoric acid, has dirt-repellent properties and nevertheless has 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 features specified in claim 1.
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.Corrosion protection is created with the enamelling. The permeability of the fluoroplastic (PTFE) is therefore not of great importance, so that a thin PTFE coating is sufficient. It ensures the anti-adhesive properties and, due to the small layer thickness, has only an insignificant influence on the heat storage capacity and the thermal conductivity.
Vorzugsweise wird eine Schichtdicke von 10 bis 50 μm gewählt, da etwa bis zu dieser Schichtdicke das PTFE in einem Arbeitsgang aufgebracht werden kann.A layer thickness of 10 to 50 μm is preferably selected, since 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 protection against corrosion, the enamel layer is designed to be acid-proof.
Ein Verfahren zur Herstellung eines Heizelementes nach Anspruch 1 zeichnet sich durch folgende Schritte ausA method for producing a heating element according to claim 1 is characterized by the following steps
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. Es hat sich überraschend gezeigt, daß sich eine dünne Schicht von Fluorkunststoff von beispielsweise 10 bis 50 μm Dicke ohne besondere Vorbehandlung der Emailoberfläche hinreichend gut auf dem Email haftet.a. Steel coils are profiled with the help of profile rollers and cut from them according to the required dimensions of heating elements, b. the heating element is enamelled and c. the fluoroplastic is applied. It has surprisingly been found that a thin layer of fluoroplastic, for example 10 to 50 μm thick, adheres sufficiently well to the enamel without special pretreatment of the enamel surface.
Zur Verbesserung der Haftung kann eine Aufrauhung der Emailschicht vorgenommen werden.To improve the adhesion, the enamel layer can be roughened.
Grundsätzlich kann die Fluorkunststoff-Beschichtung ein- oder mehrlagig aufgebaut werden.In principle, the fluoroplastic coating can be built up in one or more layers.
Mit den emaillierten und fluorkunststoffbeschichteten Heizelementprofilen läßt sich auf besonders wirtschaflticher 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 mechanische Stabilität optimierten und bewährten Stahlblechprofile eingesetzt werden können und die dünne Fluorkunststoffschicht die Wär- meübertraguπgsleistung 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 enamelled and fluoroplastic-coated heating element profiles, a storage mass can be produced in a particularly economical manner, which is corrosion-resistant and dirt-repellent and has no thermal and structural disadvantages or restrictions in terms of operation, since the steel sheet profiles optimized and proven with regard to heat exchange, pressure loss and mechanical stability can be used and the thin fluoroplastic layer affects the heat transfer performance only insignificantly (practically not). Another advantage of the method according to the invention is that the fluoroplastic coating can be carried out with the devices customary for enamelling heating plates and thus no additional apparatus and devices are necessary for the production.
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 weni- ger 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 heating element profiles reduces or even completely prevents the build-up of pressure loss-increasing layers of dirt on the profiles. This brings operational advantages because the intervals for the cleaning of the storage mass necessary when the maximum permissible pressure drop is reached can then be extended and thus smaller amounts of waste water are also generated. If deposits nevertheless form, they will stick to fluoroplastic ger firmly and can be cleaned with a lower blowing or flushing pressure / and therefore with smaller amounts of blowing medium and flushing 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 geringerer CO2 -Emission und die dem Luftvorwärmer nachgeschalteten Anlagen (Elektrofilter, Rauchgasreinigungsanlage) können kleiner gebaut werden.For reasons of better economic efficiency of a boiler system, the lowest possible flue gas outlet temperature (temperature of the flue gas after flowing through the heat exchanger) and thus the lowest possible cold end temperature of the heat exchanger is aimed at in air preheaters. In the case of dust-containing flue gases, the limits were previously limited due to the rapid build-up of deposits and poor cleanability. The inventive dirt-repellent heating plate profiles prevent the formation of deposits when the temperature falls below the dew point or it is at least easier to control, which ultimately allows a better lowering of the flue gas temperature. A lower flue gas temperature means a higher boiler efficiency and thus lower CO 2 emissions, and the systems downstream of the air preheater (electrostatic precipitator, flue gas cleaning system) can be built smaller.
Auch bei Regenerativ-Wärmetauschem 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 Be- schichtungskombination leichter abreinigen.Even in the case of regenerative heat exchangers in plants for the selective reduction of nitrogen oxides (SCR-De NOx), the deposits of ammonium sulfates which form on the hot layer or middle layer can be cleaned more easily using the coating combination according to the invention.
Anhand eines Ausführungsbeispieles wird ein erfindungsgemäßes Heizelement und ein Verfahren zur Herstellung des Heizelementes beschrieben.A heating element according to the invention and a method for producing the heating element are described using an exemplary embodiment.
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 Bei- spiel 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 sheet steel, which, after being profiled, is prepared for the enamelling by degreasing or pickling. After enamelling with an acid-resistant enamel, the fluoroplastic (e.g. PTFE) is applied in a layer thickness of 10 to 50 μm without pretreating the enamelled surface. play by spraying, applied, dried and tempered. To improve the adhesive force, the enamel surface can be roughened, for example by light sandblasting, pickling with hydrofluoric acid or a base, before applying the fluoroplastic coating.
Die Beschichtung kann ein- oder mehrlagig aufgebracht werden. Nach einer bevorzugten Ausführungsform wird auf das Email ohne Vorbehandlung eine besonders gut haftende Fiuorpolymergrundierung und darauf eine Fluorpolymerdeckschicht aufgebracht. The coating can be applied in one or more layers. According to a preferred embodiment, a particularly well adhering fluoropolymer primer is applied to the enamel without pretreatment, and a fluoropolymer cover layer is applied thereon.

Claims

Patentansprüche claims
1. Heizelement für einen Regenerativ-Wärmetauscher, das als profiliertes Stahlblech ausgebildet ist, dadurch gekennzeichnet, daß das Stahlblech emailliert ist und daß die emaillierte Oberfläche mit einer Beschichtung aus Fluorkunststoff versehen ist.1. Heating element for a regenerative heat exchanger, which is designed as a profiled steel sheet, characterized in that the steel sheet is enamelled and that the enamelled surface is provided with a coating of fluoroplastic.
2. Heizelement nach Anspruch 1 , dadurch gekennzeichnet, daß die Fluorkunststoff-Beschichtung eine Schichtstärke von 10 bis 50 μm aufweist.2. Heating element according to claim 1, characterized in that the fluoroplastic coating has a layer thickness of 10 to 50 microns.
3. Heizelement nach Anspruch 1 , dadurch gekennzeichnet, daß die emaillierte Oberfläche säurefest ausgebildet ist.3. Heating element according to claim 1, characterized in that the enamelled surface is acid-resistant.
4. Verfahren zur Herstellung eines Heizelements für Regenerativ- Wärmetauscher nach Anspruch 1 , dadurch gekennzeichnet, daß Stahlcoils mit Hilfe von Profilwalzen profiliert und daraus entsprechend der geforderten Maße das Heizelement zugeschnitten wird, daß das Stahlblech emailliert wird und daß die Fluorkunststoff-Beschichtung aufgebracht wird.4. A method for producing a heating element for regenerative heat exchangers according to claim 1, characterized in that steel coils are profiled with the aid of profile rollers and the heating element is cut therefrom according to the required dimensions, that the steel sheet is enamelled and that the fluoroplastic coating is applied.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die emaillierte Oberfläche des Stahlbleches aufgerauht wird.5. The method according to claim 4, characterized in that the enamelled surface of the steel sheet is roughened.
6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Fluorkunststoff- Beschichtung ein-oder mehrlagig aufgebracht wird. 6. The method according to claim 4, characterized 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)

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DE19940627 1999-08-27
DE19940627A DE19940627A1 (en) 1999-08-27 1999-08-27 Heating element for a regenerative heat exchanger and method for producing a heating element
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

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

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KR (1) KR100632452B1 (en)
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US6648061B2 (en) 2003-11-18
PL195191B1 (en) 2007-08-31
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CA2391837A1 (en) 2001-03-08
KR100632452B1 (en) 2006-10-09
CN1371465A (en) 2002-09-25
KR20020053805A (en) 2002-07-05
DE50001304D1 (en) 2003-03-27
CZ293669B6 (en) 2004-06-16
CN1148561C (en) 2004-05-05
IL148160A0 (en) 2002-09-12
TW448287B (en) 2001-08-01
TR200200481T2 (en) 2002-06-21
PL352370A1 (en) 2003-08-25
BR0013580A (en) 2002-04-30
CZ2002584A3 (en) 2002-09-11
MXPA02001209A (en) 2004-10-15
US20020108245A1 (en) 2002-08-15
DE19940627A1 (en) 2001-03-01
CA2391837C (en) 2007-06-26
ATE232965T1 (en) 2003-03-15
JP2003508715A (en) 2003-03-04
EP1208344B1 (en) 2003-02-19
AU6571100A (en) 2001-03-26
ES2190981T3 (en) 2003-09-01

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