EP2244848A2 - Method for cleaning a heat exchanger - Google Patents

Method for cleaning a heat exchanger

Info

Publication number
EP2244848A2
EP2244848A2 EP08871095A EP08871095A EP2244848A2 EP 2244848 A2 EP2244848 A2 EP 2244848A2 EP 08871095 A EP08871095 A EP 08871095A EP 08871095 A EP08871095 A EP 08871095A EP 2244848 A2 EP2244848 A2 EP 2244848A2
Authority
EP
European Patent Office
Prior art keywords
deposits
cleaning solution
cleaning
heat exchanger
steam generator
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
EP08871095A
Other languages
German (de)
French (fr)
Other versions
EP2244848B1 (en
Inventor
Ursula Hollwedel
Franz Ammann
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.)
Areva GmbH
Original Assignee
Areva NP 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 Areva NP GmbH filed Critical Areva NP GmbH
Publication of EP2244848A2 publication Critical patent/EP2244848A2/en
Application granted granted Critical
Publication of EP2244848B1 publication Critical patent/EP2244848B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/023Cleaning the external surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08Cleaning containers, e.g. tanks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22STEAM GENERATION
    • F22BMETHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00Component parts or details of steam boilers
    • F22B37/02Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28HEAT EXCHANGE IN GENERAL
    • F28GCLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the invention relates to a method for cleaning the secondary space of a heat exchanger, in particular a steam generator of a nuclear installation.
  • a method for cleaning the secondary space of a heat exchanger in particular a steam generator of a nuclear installation.
  • deposits which are present on the secondary side in a steam generator and which have formed there during operation are removed.
  • a heat exchanger has a primary and a secondary chamber, each of which flows through a primary or secondary coolant during operation.
  • the primary coolant heated while releasing a portion of its heat flowing through the secondary chamber secondary coolant.
  • a special heat exchanger is the steam generator of a nuclear installation. In a pressurized water reactor, the primary coolant heated in the reactor core is supplied to a steam generator. With the help of the steam generator, a secondary coolant is heated or evaporated, with which in turn a generator is operated to generate electricity.
  • the container and support of the heat exchanger tubes are usually made of carbon steel or other low alloy steels. During operation of the nuclear power plant, these parts are subject to corrosion.
  • Corrosion products mainly magnetite (Fe 3 O 4 ), settle as deposits on the surfaces of the secondary space of the heat exchange. These deposits and deposits mainly consist of magnetite, but also contain copper, nickel, zinc, chromium and other elements as well as their compounds.
  • a tube bundle of heat exchanger tubes extends into the secondary space.
  • the outer or shell sides of the heat exchanger tubes cover each other. On the shell side existing deposits are therefore difficult to remove.
  • other fixtures and brackets for mounting the heat exchanger tubes in the secondary chamber. Between the heat exchanger tubes and such support there are a number of hard to reach cracks and crevices in which deposits can accumulate.
  • the deposits present in the secondary space involve various technical problems.
  • the deposits present on the surface of the heat exchanger tubes lead to a deterioration of the heat transfer between the primary and the secondary coolant.
  • the deposits cause various damage mechanisms. For example, these can accelerate the corrosion of the affected components.
  • the secondary chamber of the heat exchanger is cleaned and freed as far as possible from the deposits.
  • a so-called maintenance cleaning can be carried out in addition to a complete cleaning. In such a maintenance cleaning only a part of the existing coverings is removed.
  • the aim of the maintenance cleaning is to remove the coverings to the extent that approximately the amount is removed from the steam generator, which has formed there since the last maintenance cleaning.
  • the state of the steam generator can be maintained or possibly slightly improved.
  • DE 102 38 730 A1 discloses such a chemical cleaning method.
  • the steam generator is filled with a cleaning solution containing a complexing agent for the dissolution of iron-containing deposits, and at pressures between 6 and 10 bar, and at temperatures when treated at about 140 0 C.
  • a cleaning solution containing a complexing agent for the dissolution of iron-containing deposits, and at pressures between 6 and 10 bar, and at temperatures when treated at about 140 0 C.
  • the cleaning solution is drained from the steam generator. If the deposits additionally contain copper or copper compounds, these are then treated with an alkaline cleaning solution. dissolved in the presence of an oxidizing agent and a complexing agent.
  • the object of the present invention is to provide an alternative purification process which operates with improved efficiency and, accordingly, with reduced use of chemicals.
  • the object is achieved by a method according to claim 1.
  • the method according to the invention for cleaning the secondary space of a heat exchanger of the type mentioned at the outset comprises the following steps: deposits which are present in the secondary space are dried, the secondary space being dried by the sewer. customer coolant is mostly emptied. Subsequently, a cleaning solution is introduced into the secondary chamber.
  • the method according to the invention is based on the following considerations: It has been found that the deposits present in the secondary space of the heat exchanger are mechanically destabilized by drying. As a result, they at least partially burst from the surfaces of the secondary space.
  • the existing on the shell side of the heat exchanger tubes deposits are mainly solved and fall on the tubesheet. In this way, at least a portion of the deposits present on the surfaces of the secondary space can be removed without the use of chemicals.
  • the deposits removed in this way accumulate on the tubesheet of the heat exchanger.
  • the deposits still present on the surfaces are then at least partially removed with the aid of the cleaning solution introduced into the secondary chamber.
  • the method according to the invention is thus a combined physicochemical cleaning method.
  • the chemicals used to dissolve the deposits can be dispensed more sparingly for the following reasons.
  • the cleaning chemicals can be metered in substoichiometrically based on the mass of impurities present in the secondary space.
  • the accumulated on the tubesheet of the heat exchanger deposits offer, based on their mass, the cleaning solution to a relatively small surface.
  • the deposits still present on the surfaces of the secondary space have a comparatively large surface area, based on their mass.
  • the total surface area of the deposits present on the surfaces of the secondary space will generally be many times greater than the surface area of the deposits piled up on the tubesheet.
  • the cleaning solution used for cleaning the secondary space of the heat exchanger therefore does not have to completely dissolve the deposits and impurities present in the secondary space, and can therefore be metered under the stoichiometric amount, based on the total mass of the deposits.
  • it is merely waited until the deposits which are still present on the surfaces of the secondary space of the heat exchanger are dissolved.
  • the accumulated on the tube plate deposits are removed after draining the cleaning solution, for example by means of a mechanical cleaning process from the secondary chamber of the heat exchanger.
  • it can, for example, be rinsed (tube sheet lancing).
  • the physical drying step upstream of the dry cleaning which can be done, for example, by introducing hot air or inert gas, also causes the water contained in the surface pores and channels of the deposits to be removed.
  • pores present in the deposits may still be filled with water, so that, on the one hand, the penetration of cleaning solution is severely hindered, and, on the other hand, due to the presence of water, a local dilution which reduces the cleaning action takes place.
  • the cleaning solution Due to the upstream physical drying, the cleaning solution can penetrate practically undiluted into the pores and channels of the deposits. The cleaning solution is thus used more effectively than with conventional
  • the drying of the deposits present in the secondary space is effected by evacuating the secondary space.
  • the drying takes place both by negative pressure, as well as at elevated temperatures, for example by utilizing an operational residual heat.
  • Another advantageous effect is that a part of the cleaning solution evaporates when it is introduced into the still hot and additionally subjected to negative pressure secondary chamber.
  • the gaseous cleaning solution condenses on the coverings and precipitates preferentially in the pores and cracks (capillary condensation).
  • the drying of the deposits causes them to be mechanically destabilized and at least partially flake off the surface of the secondary space.
  • This effect can be enhanced by boiling the cleaning solution introduced into the secondary chamber according to another embodiment.
  • the cleaning solution present in the pores and cracks of the deposits also begins to boil.
  • the resulting in the pores and cracks, so in the interior of the deposits, overpressure leads to a mechanical destabilization of the same.
  • the heating of the cleaning solution can be effected or assisted by introducing superheated steam into the secondary chamber.
  • the introduced into the cleaning solution hot steam causes in addition to the heating that it is mixed.
  • the deposits which form in operation on the surfaces of the secondary space of a heat exchanger or steam generator, contain mainly iron oxide (magnetite), but partly also metallic copper and copper compounds.
  • Cleaning solutions can be used to dissolve these deposits, as can be seen from the above-mentioned DE 102 38 730 A1, EP 0 198 340 A1, DE 198 57 342 A1 or EP 0 273 182 A1.
  • the drying step according to the invention is carried out at least once, namely before the steam generator is filled with the cleaning solution.
  • Such an approach is for example when using cleaning chemicals according to DE 198 57 342 Al, in which the steam generator between the magnetite and the copper removal is not emptied attached.
  • a further drying step can take place after draining off the first cleaning solution.
  • such an intermediate drying step can also be used a process are carried out in which first the copper and then the magnetite is removed, as is apparent, for example from EP 0 198 340 Al.
  • the cleaning solutions used are particularly effective at a temperature between 40 0 C and 160 0 C.
  • the dissolved deposits are removed by draining the cleaning solution from the secondary chamber of the heat exchanger.
  • the unresolved deposits, which have accumulated predominantly at the bottom of the heat exchanger, are removed by mechanical cleaning, for example by rinsing, from the heat exchanger.
  • the heat exchanger is the steam generator of a nuclear installation.
  • the deposits consist mainly of magnetite.
  • Fig. 1 shows a highly schematic steam generator in a longitudinal section
  • Fig. 2 is a detail view of such a steam generator.
  • the heated in the reactor core of a pressurized water reactor primary coolant flows through the primary chamber 5 of the indicated in Fig. 1 steam generator 2.
  • the steam generator 2 In the lower part of the steam generator 2 is a plurality of U-shaped bent tubes 4, which are also referred to as a tube bundle. For green the sake of clarity, only two U-tubes 4 are shown.
  • the primary coolant entering the primary chamber 5 flows through the U-tubes 4 while giving off part of its heat to a secondary coolant present in the secondary chamber 6.
  • the steam generator 2 in the lower region of the secondary chamber 6 supplied, now heated or evaporated secondary refrigerant is removed from this in the upper area, and used to operate a generator.
  • deposits 12 are formed in the secondary chamber 6. These form in the region of the holders 8, but especially on the outer or shell sides of the U-tubes 4 themselves.
  • FIG. 1 shows a section of the steam generator 2 known from FIG. 1 in the region of the bent U-tubes 4.
  • a U-tube 4 through which primary coolant flows is shown, which is held by a holder 8 and a bottom plate 10 penetrates into the primary region 5 opens.
  • the holder 8 and the U-tube 4 and the transitions between the bottom plate 10 and the U-tube 4, as well as on the shell side of the U-tubes 4 are themselves
  • the quantitatively predominant part of the deposits 12 is on the surface of the U-tubes 4 itself.
  • the secondary coolant is first discharged from the steam generator 2. Subsequently, the secondary space 6 subjected to a vacuum or evacuated. In this case, the negative pressure is chosen to be at least so great that at the given temperature the negative pressure is sufficient to evaporate the secondary coolant, usually water.
  • the secondary space 6 of the steam generator 2 is dried by introducing hot air. The impurities 12 dry very rapidly under the conditions described, with their surface forming cracks. As already mentioned, due to the loss of volume occurring during drying, the deposits partly burst from their base. The chipped
  • the secondary chamber 6 of the steam generator 2 is preferably kept under vacuum, while in this the cleaning solution is introduced.
  • the secondary chamber 6 of the steam generator 2 is preferably filled to the upper edge of the tube bundle with cleaning solution.
  • the cleaning solution used to dissolve the magnetite coatings contains a complex-forming acid, for example ethylenediaminetetraacetic acid (EDTA), an alkalizing agent, for example ammonia, morpholine or a mixture of the substances mentioned, and a reducing agent, for example hydrazine.
  • EDTA ethylenediaminetetraacetic acid
  • alkalizing agent for example ammonia, morpholine or a mixture of the substances mentioned
  • a reducing agent for example hydrazine.
  • other well-known cleaning solutions may also be used.
  • the cleaning solution is heated to a temperature in the range of 40 0 C to 160 0 C. This is preferably done by introducing hot steam into the steam generator.
  • the cleaning solution is heated by means of the main coolant pump via the primary circuit of the nuclear facility. If the cleaning solution heated to the extent that it boils, this leads to a thorough mixing of the cleaning solution.
  • inert gas is pressed into the steam generator for thorough mixing of the cleaning solution. Spent and unconsumed cleaning solution are mixed, in particular unused cleaning solution in places where still deposits 12 are present, so that they can be resolved.
  • the deposits 12 are additionally removed mechanically by the boiling cleaning solution from the surfaces of the steam generator.
  • the magnetite deposits dissolved by the cleaning solution are removed by draining the cleaning solution from the secondary chamber 6.
  • the remaining, not solved by the cleaning solution magnetite deposits, which are piled on the tube sheet 10 are removed mechanically, for example by rinsing the tube sheet 10, from the secondary chamber 6.
  • the copper-containing deposits 12 are dissolved by forming water-soluble complexes of the copper compounds.
  • a complexing agent for example, ethylenediamine (EDA), ethylenediaminetetraacetic acid (EDTA) in amoniakalischer solution under oxidizing conditions is suitable. Oxidizing conditions are achieved, for example, by metering in hydrogen peroxide and / or blowing in air or oxygen.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention relates to a physico-chemical method for cleaning the secondary chamber of a heat exchanger in a nuclear plant, wherein the secondary chamber (6) is dried. A cleaning solution is introduced into the chamber to treat the deposits present in the secondary chamber (6).

Description

Beschreibung description
Verfahren zur Reinigung eines WärmetauschersProcess for cleaning a heat exchanger
Die Erfindung betrifft ein Verfahren zur Reinigung des Sekundärraumes eines Wärmetauschers, insbesondere eines Dampferzeugers einer kerntechnischen Anlage. Mit einem solchen Verfahren, welches beispielsweise aus der EP 0 198 340 Al hervor- geht, werden in einem Dampferzeuger sekundärseitig vorhandene Ablagerungen entfernt, die sich während des Betriebs dort gebildet haben.The invention relates to a method for cleaning the secondary space of a heat exchanger, in particular a steam generator of a nuclear installation. With such a method, which results, for example, from EP 0 198 340 A1, deposits which are present on the secondary side in a steam generator and which have formed there during operation are removed.
Ein Wärmetauscher verfügt über einen Primär- und einen Sekun- därraum, welche im Betrieb jeweils von einem Primär- bzw. Sekundärkühlmittel durchströmt sind. Das Primärkühlmittel erhitzt dabei unter Abgabe eines Teils seiner Wärme das durch den Sekundärraum fließende Sekundärkühlmittel. Ein spezieller Wärmetauscher ist der Dampferzeuger einer kerntechnischen Anlage. Bei einem Druckwasserreaktor wird das in dem Reaktorkern erhitzte Primärkühlmittel einem Dampferzeuger zugeführt. Mit Hilfe des Dampferzeugers wird ein Sekundärkühlmittel erhitzt bzw. verdampft, mit welchem wiederum ein Generator zur Erzeugung von Elektrizität betrieben wird.A heat exchanger has a primary and a secondary chamber, each of which flows through a primary or secondary coolant during operation. The primary coolant heated while releasing a portion of its heat flowing through the secondary chamber secondary coolant. A special heat exchanger is the steam generator of a nuclear installation. In a pressurized water reactor, the primary coolant heated in the reactor core is supplied to a steam generator. With the help of the steam generator, a secondary coolant is heated or evaporated, with which in turn a generator is operated to generate electricity.
Während die Wärmetauscherrohre selbst üblicherweise aus korrosionsfesten Legierungen bestehen, sind der Behälter und die Halterung der Wärmetauscherrohre normalerweise aus C-Stahl oder anderen niedriglegierten Stählen hergestellt. Im Betrieb des Kernkraftwerkes unterliegen diese Teile der Korrosion.While the heat exchanger tubes themselves are usually made of corrosion resistant alloys, the container and support of the heat exchanger tubes are usually made of carbon steel or other low alloy steels. During operation of the nuclear power plant, these parts are subject to corrosion.
Korrosionsprodukte, hauptsächlich Magnetit (Fe3θ4) , setzen sich als Beläge auf den Oberflächen des Sekundärraumes des Wärme- tauschers ab. Diese Beläge und Ablagerungen bestehen hauptsächlich aus Magnetit, enthalten aber auch Kupfer, Nickel, Zink, Chrom und andere Elemente sowie deren Verbindungen.Corrosion products, mainly magnetite (Fe 3 O 4 ), settle as deposits on the surfaces of the secondary space of the heat exchange. These deposits and deposits mainly consist of magnetite, but also contain copper, nickel, zinc, chromium and other elements as well as their compounds.
Die Primär- oder Rohrseite eines Wärmetauschers, also dieThe primary or pipe side of a heat exchanger, so the
Innenseite der Wärmetauscherrohre, ist verhältnismäßig einfach über die primärseitige Wasserkammer zu erreichen, und daher relativ einfach von ggf. vorhandenen Ablagerungen zu reinigen. Der Sekundärraum eines Wärmetauschers ist vergleichsweise schlecht zugänglich und daher auch schwieriger zu reinigen.Inside the heat exchanger tubes, is relatively easy to achieve on the primary side water chamber, and therefore relatively easy to clean from any existing deposits. The secondary space of a heat exchanger is relatively poorly accessible and therefore more difficult to clean.
Üblicherweise erstreckt sich ein Rohrbündel aus Wärmetauscherrohren in den Sekundärraum hinein. Bei einem solchen Rohrbündel verdecken sich die Außen- oder Mantelseiten der Wärmetau- scherrohre gegenseitig. Auf der Mantelseite vorhandene Ablagerungen sind daher schwer zu entfernen. Außer dem Rohrbündel befinden sich weitere Einbauten und Halterungen zur Befestigung der Wärmetauscherrohre in dem Sekundärraum. Zwischen den Wärmetauscherrohren und solchen Halterung existiert eine Viel- zahl von schwer zugänglichen Ritzen und Spalten, in denen sich Ablagerungen ansammeln können.Usually, a tube bundle of heat exchanger tubes extends into the secondary space. In such a tube bundle, the outer or shell sides of the heat exchanger tubes cover each other. On the shell side existing deposits are therefore difficult to remove. In addition to the tube bundle are other fixtures and brackets for mounting the heat exchanger tubes in the secondary chamber. Between the heat exchanger tubes and such support there are a number of hard to reach cracks and crevices in which deposits can accumulate.
Die in dem Sekundärraum vorhandenen Ablagerungen bringen verschiedene technische Probleme mit sich. Die auf der Oberfläche der Wärmetauscherrohre vorhandenen Ablagerungen führen zu einer Verschlechterung des Wärmeüberganges zwischen dem Primär- und dem Sekundärkühlmittel. Außerdem rufen die Ablagerungen verschiedene Schädigungsmechanismen hervor. Beispielsweise können diese die Korrosion der betroffenen Bauteile beschleu- nigen. Um diesen technischen Problemen zu begegnen, wird der Sekundärraum des Wärmetauschers gereinigt und soweit wie möglich von den Ablagerungen befreit. Bei Dampferzeugern in kerntechnischen Anlagen kann neben einer vollständigen Reinigung eine sogenannte Wartungsreinigung (maintenance cleaning) durchgeführt werden. Bei einer solchen Wartungsreinigung wird lediglich ein Teil der vorhandenen Beläge entfernt. Ziel der Wartungsreinigung ist es, die Beläge soweit zu entfernen, dass in etwa diejenige Menge aus dem Dampferzeuger entfernt wird, die sich seit der letzten Wartungsreinigung dort gebildet hat. So kann der Zustand des Dampferzeugers gehalten oder ggf. geringfügig verbessert werden.The deposits present in the secondary space involve various technical problems. The deposits present on the surface of the heat exchanger tubes lead to a deterioration of the heat transfer between the primary and the secondary coolant. In addition, the deposits cause various damage mechanisms. For example, these can accelerate the corrosion of the affected components. To counteract these technical problems, the secondary chamber of the heat exchanger is cleaned and freed as far as possible from the deposits. In steam generators in nuclear installations, a so-called maintenance cleaning can be carried out in addition to a complete cleaning. In such a maintenance cleaning only a part of the existing coverings is removed. The aim of the maintenance cleaning is to remove the coverings to the extent that approximately the amount is removed from the steam generator, which has formed there since the last maintenance cleaning. Thus, the state of the steam generator can be maintained or possibly slightly improved.
Mechanische Reinigungsverfahren zur Entfernung der Ablagerun- gen, wie beispielsweise eine Spülung des Rohrbodens, sind nur begrenzt wirksam oder aufgrund der schlechten Zugänglichkeit des Innenraums des Dampferzeugers nur begrenzt einsetzbar. Zur Entfernung der Ablagerungen und Beläge werden daher vornehmlich chemische Reinigungsverfahren eingesetzt.Mechanical cleaning methods for removing the deposits, such as, for example, flushing the tube bottom, have only limited effectiveness or can only be used to a limited extent due to the poor accessibility of the interior of the steam generator. To remove the deposits and deposits, therefore, primarily chemical cleaning methods are used.
Die DE 102 38 730 Al offenbart ein solches chemisches Reinigungsverfahren. Der Dampferzeuger wird mit einer Reinigungslösung gefüllt, die einen Komplexbildner zur Auflösung von eisenhaltigen Ablagerungen enthält, und bei Drücken zwischen 6 und 10 bar, sowie bei Temperaturen wenn in etwa 1400C behandelt. Zur Durchmischung der Reinigungslösung wird der Dampferzeuger plötzlichen Druckentlastungen unterworfen. Nachdem die eisenhaltigen Beläge aufgelöst worden sind, wird die Reinigungslösung aus dem Dampferzeuger abgelassen. Enthalten die Ablagerungen zusätzlich Kupfer oder Kupferverbindungen, so werden diese im Anschluss mit einer alkalischen Reinigungslö- sung bei Anwesenheit eines Oxidationsmittels und eines Komplexbildners aufgelöst.DE 102 38 730 A1 discloses such a chemical cleaning method. The steam generator is filled with a cleaning solution containing a complexing agent for the dissolution of iron-containing deposits, and at pressures between 6 and 10 bar, and at temperatures when treated at about 140 0 C. For mixing of the cleaning solution of the steam generator is subjected to sudden pressure reliefs. After the iron-containing deposits have been dissolved, the cleaning solution is drained from the steam generator. If the deposits additionally contain copper or copper compounds, these are then treated with an alkaline cleaning solution. dissolved in the presence of an oxidizing agent and a complexing agent.
Ein weiteres Reinigungsverfahren geht aus der EP 0 198 340 Al hervor. Im Gegensatz zu dem zuvor beschriebenen Reinigungsverfahren werden bei diesem zuerst die Kupferverbindungen und anschließend die eisenhaltigen Beläge (Magnetit) aufgelöst.Another cleaning method is evident from EP 0 198 340 Al. In contrast to the cleaning method described above, first the copper compounds and then the iron-containing deposits (magnetite) are dissolved in this.
Es sind außerdem Verfahren bekannt, bei denen sowohl Magnetit, als auch Kupfer mit einer Reinigungslösung, d.h. ohne zwischenzeitliches Ablassen und erneutes Befüllen des Dampferzeugers, entfernt werden. Die in dem Dampferzeuger vorhandene Reinigungslösung wird nach Auflösen des Magnetits verändert, so dass anschließend Kupfer und Kupferverbindungen aufgelöst werden können. Ein solches Verfahren geht beispielsweise aus der DE 198 54 342 Al hervor.There are also known methods in which both magnetite and copper are mixed with a cleaning solution, i. without being temporarily drained and refilling the steam generator. The existing in the steam generator cleaning solution is changed after dissolution of the magnetite, so that then copper and copper compounds can be dissolved. Such a process is evident, for example, from DE 198 54 342 A1.
Ein Nachteil der genannten chemischen Verfahren ist vor allem der hohe Verbrauch an Reinigungschemikalien.A disadvantage of the mentioned chemical processes is above all the high consumption of cleaning chemicals.
Aufgabe der vorliegenden Erfindung ist es, ein alternatives Reinigungsverfahren anzugeben, welches mit verbesserter Effizienz und dementsprechend mit verringertem Chemikalieneinsatz arbeitet .The object of the present invention is to provide an alternative purification process which operates with improved efficiency and, accordingly, with reduced use of chemicals.
Die Aufgabe wird gelöst mit einem Verfahren nach Anspruch 1.The object is achieved by a method according to claim 1.
Das erfindungsgemäße Verfahren zur Reinigung des Sekundärraumes eines Wärmetauschers der eingangs genannten Art umfasst die folgenden Schritte: In dem Sekundärraum vorhandene Ablagerungen werden getrocknet, wobei der Sekundärraum von dem Se- kundärkühlmittel überwiegend entleert ist. Anschließend wird eine Reinigungslösung in den Sekundärraum eingebracht.The method according to the invention for cleaning the secondary space of a heat exchanger of the type mentioned at the outset comprises the following steps: deposits which are present in the secondary space are dried, the secondary space being dried by the sewer. customer coolant is mostly emptied. Subsequently, a cleaning solution is introduced into the secondary chamber.
Dem erfindungsgemäßen Verfahren liegen dabei die folgenden Überlegungen zu Grunde: Es konnte herausgefunden werden, dass die in dem Sekundärraum des Wärmetauschers vorhandenen Ablagerungen durch eine Trocknung mechanisch destabilisiert werden. In Folge dessen platzen diese zumindest teilweise von den Oberflächen des Sekundärraums ab. Die auf der Mantelseite der Wärmetauscherrohre vorhandenen Ablagerungen werden überwiegend gelöst und fallen auf den Rohrboden. Auf diese Weise kann zumindest ein Teil der auf den Oberflächen des Sekundärraumes vorhandenen Ablagerungen ohne Einsatz von Chemikalien entfernt werden. Die auf diese Weise entfernten Ablagerungen häufen sich auf dem Rohrboden des Wärmetauschers an. Die noch auf den Oberflächen vorhandenen Ablagerungen werden im Anschluss mit Hilfe der in den Sekundärraum eingeleiteten Reinigungslösung zumindest teilweise entfernt. Bei dem erfindungsgemäßen Verfahren handelt es sich also ein kombiniertes physikalisch- chemisches Reinigungsverfahren.The method according to the invention is based on the following considerations: It has been found that the deposits present in the secondary space of the heat exchanger are mechanically destabilized by drying. As a result, they at least partially burst from the surfaces of the secondary space. The existing on the shell side of the heat exchanger tubes deposits are mainly solved and fall on the tubesheet. In this way, at least a portion of the deposits present on the surfaces of the secondary space can be removed without the use of chemicals. The deposits removed in this way accumulate on the tubesheet of the heat exchanger. The deposits still present on the surfaces are then at least partially removed with the aid of the cleaning solution introduced into the secondary chamber. The method according to the invention is thus a combined physicochemical cleaning method.
Im Vergleich zu konventionellen Reinigungsverfahren können erfindungsgemäß die zur Auflösung der Ablagerungen verwendeten Chemikalien aus den folgenden Gründen sparsamer dosiert wer- den. Insbesondere können die Reinigungschemikalien bezogen auf die in dem Sekundärraum vorhandene Masse an Verunreinigungen unterstöchometrisch dosiert werden. Die auf dem Rohrboden des Wärmetauschers aufgehäuften Ablagerungen bieten, bezogen auf ihre Masse, der Reinigungslösung eine vergleichsweise kleine Oberfläche an. Die noch auf den Oberflächen des Sekundärraumes vorhandenen Ablagerungen weisen hingegen, bezogen auf ihre Masse, eine vergleichsweise große Oberfläche auf. Auch im absoluten Vergleich wird in der Regel die Gesamtoberfläche der auf den Oberflächen des Sekundärraumes vorhandenen Ablagerungen um ein vielfaches größer sein, als die Oberfläche der auf dem Rohrboden aufgehäuften Ablagerungen. Die noch auf den Oberflächen des Sekundärraumes, insbesondere auf den Mantelseiten der Wärmetauscherrohre vorhandenen Ablagerungen bieten der Reinigungslösung also eine vergleichsweise große Angriffsfläche. Aus diesem Grund werden die nach wie vor auf den Oberflächen des Sekundärraumes des Wärmetauschers vorhandenen Ablagerungen um ein vielfaches schneller aufgelöst, als diejenigen Ablagerungen, welche aufgehäuft auf dem Rohrboden liegen .Compared to conventional cleaning methods, the chemicals used to dissolve the deposits can be dispensed more sparingly for the following reasons. In particular, the cleaning chemicals can be metered in substoichiometrically based on the mass of impurities present in the secondary space. The accumulated on the tubesheet of the heat exchanger deposits offer, based on their mass, the cleaning solution to a relatively small surface. By contrast, the deposits still present on the surfaces of the secondary space have a comparatively large surface area, based on their mass. Also in In absolute comparison, the total surface area of the deposits present on the surfaces of the secondary space will generally be many times greater than the surface area of the deposits piled up on the tubesheet. The deposits still present on the surfaces of the secondary space, in particular on the shell sides of the heat exchanger tubes, thus provide the cleaning solution with a comparatively large attack surface. For this reason, the deposits still present on the surfaces of the secondary space of the heat exchanger are dissolved many times faster than those deposits piled on the tubesheet.
Die zur Reinigung des Sekundärraumes des Wärmetauschers ver- wendete Reinigungslösung muss die im Sekundärraum vorhandenen Ablagerungen und Verunreinigungen also nicht vollständig auflösen, und kann daher, bezogen auf die Gesamtmasse der Ablagerungen, unterstöchometrisch dosiert werden. Bei dem erfindungsgemäßen Reinigungsverfahren wird lediglich abgewartet, bis die noch auf den Oberflächen des Sekundärraumes des Wärmetauschers vorhandenen Ablagerungen aufgelöst sind. Die auf dem Rohrboden aufgehäuften Ablagerungen werden nach Ablassen der Reinigungslösung beispielsweise mit Hilfe eines mechanischen Reinigungsverfahrens aus dem Sekundärraum des Wärmetauschers entfernt. Zur Entfernung der auf dem Rohrboden des Wärmetauschers liegenden Ablagerungen kann dieser beispielsweise gespült werden (tube sheet lancing) .The cleaning solution used for cleaning the secondary space of the heat exchanger therefore does not have to completely dissolve the deposits and impurities present in the secondary space, and can therefore be metered under the stoichiometric amount, based on the total mass of the deposits. In the cleaning method according to the invention, it is merely waited until the deposits which are still present on the surfaces of the secondary space of the heat exchanger are dissolved. The accumulated on the tube plate deposits are removed after draining the cleaning solution, for example by means of a mechanical cleaning process from the secondary chamber of the heat exchanger. To remove the deposits lying on the tubesheet of the heat exchanger, it can, for example, be rinsed (tube sheet lancing).
Die physikalische Trocknung der Ablagerungen führt außerdem dazu, dass diese rissig werden. Diese Risse vergrößern diePhysical drying of the deposits also causes them to crack. These cracks enlarge the
Oberfläche der Ablagerungen, folglich bieten diese der Reinigungslösung eine größere Angriffsfläche. Außerdem ermöglichen die Risse einen leichteren Zutritt der Reinigungslösung in das Innere der Ablagerungen. Innerhalb der Ablagerungen ggf. vorhandene Einschlüsse oder Poren werden durch die Risse für die Reinigungslösung zugänglich. Im Vergleich zu konventionellen Reinigungsverfahren werden die Ablagerungen von der Reinigungslösung wirkungsvoller angegriffen.Surface of the deposits, therefore, these provide the cleaning solution a larger attack surface. Also allow the cracks facilitate access of the cleaning solution to the interior of the deposits. Contaminations or pores that may be present within the deposits become accessible through the cracks for the cleaning solution. Compared to conventional cleaning processes, the deposits are more effectively attacked by the cleaning solution.
Der der chemischen Reinigung vorgelagerte physikalische Trocknungsschritt, der beispielsweise durch Einleiten von heißer Luft oder Inertgas erfolgen kann, bewirkt außerdem, dass das in oberflächlichen Poren und Kanälen der Ablagerungen enthaltene Wasser entfernt wird. Bei herkömmlichen Verfahren sind in den Ablagerungen vorhandene Poren ggf. noch mit Wasser gefüllt, so dass zum einen das Eindringen von Reinigungslösung stark behindert ist, und zum anderen aufgrund des vorhandenen Wassers eine die Reinigungswirkung verringernde lokale Verdünnung erfolgt. Durch die vorgelagerte physikalische Trocknung kann die Reinigungslösung praktisch unverdünnt in die Poren und Kanäle der Ablagerungen eindringen. Die Reinigungslösung wird somit effektiver genutzt, als dies bei herkömmlichenThe physical drying step upstream of the dry cleaning, which can be done, for example, by introducing hot air or inert gas, also causes the water contained in the surface pores and channels of the deposits to be removed. In conventional methods, pores present in the deposits may still be filled with water, so that, on the one hand, the penetration of cleaning solution is severely hindered, and, on the other hand, due to the presence of water, a local dilution which reduces the cleaning action takes place. Due to the upstream physical drying, the cleaning solution can penetrate practically undiluted into the pores and channels of the deposits. The cleaning solution is thus used more effectively than with conventional
Verfahren möglich ist. In kostensparender Weise kann die Reinigung somit schneller und unter verringertem Einsatz von Reinigungschemikalien vonstatten gehen.Procedure is possible. In a cost-saving manner, the cleaning can thus go faster and with less use of cleaning chemicals.
Bei einer besonders bevorzugten Verfahrensvariante wird die Trocknung der in dem Sekundärraum vorhandenen Ablagerungen durch Evakuieren des Sekundärraums bewirkt. Zur Unterstützung der Wasserverdunstung erfolgt nach einer weiteren Ausführungsform die Trocknung sowohl durch Unterdruck, als auch bei er- höhten Temperaturen, etwa unter Ausnutzung einer betriebsbedingten Restwärme. Es hat sich nun überraschenderweise herausgestellt, dass die Reinigungswirkung einer nach dem Trock- nungsschritt eingefüllten Reinigungslösung besonders hoch ist, wenn dabei der im Sekundärraum vorhandene Unterdruck vorzugsweise während der gesamten Einfüllphase aufrechterhalten wird. Eine mögliche Erklärung ist, dass die Reinigungslösung unter Vakuum leichter in die evakuierten Risse und Poren eindringen kann, als dies bei Normaldruck möglich ist. Infolge der Evakuierung enthalten die Risse und Poren praktisch kein Gas mehr, welches ansonsten von der Reinigungsflüssigkeit verdrängt werden muss. Die Reinigungslösung kann somit einfacher in die Poren und Risse eindringen.In a particularly preferred variant of the method, the drying of the deposits present in the secondary space is effected by evacuating the secondary space. To support the evaporation of water according to a further embodiment, the drying takes place both by negative pressure, as well as at elevated temperatures, for example by utilizing an operational residual heat. It has now surprisingly been found that the cleaning effect of a cleaning solution is particularly high, if it is maintained in the secondary chamber vacuum preferably during the entire filling phase. One possible explanation is that the cleaning solution can penetrate more easily under vacuum into the evacuated cracks and pores than is possible under atmospheric pressure. As a result of the evacuation, the cracks and pores contain virtually no gas, which otherwise has to be displaced by the cleaning liquid. The cleaning solution can thus more easily penetrate into the pores and cracks.
Ein weiterer vorteilhafter Effekt ist, dass ein Teil der Reinigungslösung bei Einleiten in den noch heißen und zusätzlich mit Unterdruck beaufschlagten Sekundärraum verdampft. Die gasförmige Reinigungslösung kondensiert an den Belägen, und schlägt sie sich bevorzugt in den Poren und Rissen nieder (Kapillarkondensation) .Another advantageous effect is that a part of the cleaning solution evaporates when it is introduced into the still hot and additionally subjected to negative pressure secondary chamber. The gaseous cleaning solution condenses on the coverings and precipitates preferentially in the pores and cracks (capillary condensation).
Wie bereits erwähnt, bewirkt die Trocknung der Ablagerungen, dass diese mechanisch destabilisiert werden, und zumindest teilweise von der Oberfläche des Sekundärraumes abplatzen. Dieser Effekt kann verstärkt werden, indem nach einer weiteren Ausführungsform die in den Sekundärraum eingeleitete Reinigungslösung zum Sieden gebracht wird. Auch die in den Poren und Rissen der Ablagerungen vorhandene Reinigungslösung beginnt zu sieden. Der dadurch in den Poren und Rissen, also im Inneren der Ablagerungen, entstehende Überdruck führt zu einer mechanischen Destabilisierung derselben. Die Erwärmung der Reinigungslösung kann durch Einleiten von Heißdampf in den Sekundärraum bewirkt oder unterstützt werden. Der in die Reinigungslösung eingeleitete Heißdampf bewirkt neben der Erwärmung, dass diese durchmischt wird. Somit gelangt unverbrauchte Reinigungslösung an diejenigen Stellen, an denen vermehrt Ablagerungen vorliegen, die nunmehr aufgelöst werden können.As already mentioned, the drying of the deposits causes them to be mechanically destabilized and at least partially flake off the surface of the secondary space. This effect can be enhanced by boiling the cleaning solution introduced into the secondary chamber according to another embodiment. The cleaning solution present in the pores and cracks of the deposits also begins to boil. The resulting in the pores and cracks, so in the interior of the deposits, overpressure leads to a mechanical destabilization of the same. The heating of the cleaning solution can be effected or assisted by introducing superheated steam into the secondary chamber. The introduced into the cleaning solution hot steam causes in addition to the heating that it is mixed. Thus, unused Cleaning solution to those areas where there are increasingly deposits that can now be resolved.
Die Ablagerungen, welche sich im Betrieb auf den Oberflächen des Sekundärraumes eines Wärmetauschers oder Dampferzeugers bilden, enthalten hauptsächlich Eisenoxid (Magnetit) , teilweise aber auch metallisches Kupfer und Kupferverbindungen. Zur Auflösung dieser Ablagerungen können Reinigungslösungen verwendet werden, wie sie aus den eingangs genannten Druckschrif- ten DE 102 38 730 Al, EP 0 198 340 Al, DE 198 57 342 Al oder auch aus der EP 0 273 182 Al hervorgehen.The deposits, which form in operation on the surfaces of the secondary space of a heat exchanger or steam generator, contain mainly iron oxide (magnetite), but partly also metallic copper and copper compounds. Cleaning solutions can be used to dissolve these deposits, as can be seen from the above-mentioned DE 102 38 730 A1, EP 0 198 340 A1, DE 198 57 342 A1 or EP 0 273 182 A1.
Der erfindungsgemäße Trocknungsschritt wird, abhängig davon welche Chemikalienkombination für die Reinigungslösung verwen- det wird, zumindest einmal, nämlich bevor der Dampferzeuger mit der Reinigungslösung befüllt wird, durchgeführt. Ein solches Vorgehen ist beispielsweise bei Verwendung von Reinigungschemikalien nach der DE 198 57 342 Al, bei dem der Dampferzeuger zwischen der Magnetit- und der Kupferentfernung nicht entleert wird, angebracht. Bei einem Reinigungsverfahren, bei dem zwischen der Magnetit- und der Kupferentfernung die Reinigungslösung abgelassen wird, wie beispielsweise bei der DE 102 38 730 Al vorgesehen, kann optional ein weiterer Trocknungsschritt nach Ablassen der ersten Reinigungslösung erfol- gen. Selbstverständlich kann ein solcher Zwischentrocknungsschritt ebenso bei einem Verfahren durchgeführt werden, bei dem zuerst das Kupfer und anschließend der Magnetit entfernt wird, wie es beispielsweise aus der EP 0 198 340 Al hervorgeht .Depending on which combination of chemicals is used for the cleaning solution, the drying step according to the invention is carried out at least once, namely before the steam generator is filled with the cleaning solution. Such an approach is for example when using cleaning chemicals according to DE 198 57 342 Al, in which the steam generator between the magnetite and the copper removal is not emptied attached. In a cleaning process in which the cleaning solution is drained between the magnetite and the copper removal, as provided, for example, in DE 102 38 730 A1, optionally a further drying step can take place after draining off the first cleaning solution. Of course, such an intermediate drying step can also be used a process are carried out in which first the copper and then the magnetite is removed, as is apparent, for example from EP 0 198 340 Al.
Die eingesetzten Reinigungslösungen sind bei einer Temperatur zwischen 400C und 1600C besonders wirkungsvoll. Aus diesem Grund wird, gemäß einer Weiterbildung des erfindungsgemäßen Verfahrens, die in dem Sekundärraum des Dampferzeugers vorhandene Reinigungslösung auf eine Temperatur in dem vorgenannten Bereich erwärmt. Die aufgelösten Ablagerungen werden durch Ablassen der Reinigungslösung aus dem Sekundärraum des Wärmetauschers entfernt. Die nicht aufgelösten Ablagerungen, die sich überwiegend am Boden des Wärmetauschers angesammelt haben, werden durch mechanische Reinigung, beispielsweise durch Spülen, aus dem Wärmetauscher entfernt.The cleaning solutions used are particularly effective at a temperature between 40 0 C and 160 0 C. For this Reason is, according to a development of the method, the existing in the secondary space of the steam generator cleaning solution heated to a temperature in the aforementioned range. The dissolved deposits are removed by draining the cleaning solution from the secondary chamber of the heat exchanger. The unresolved deposits, which have accumulated predominantly at the bottom of the heat exchanger, are removed by mechanical cleaning, for example by rinsing, from the heat exchanger.
Nach einer weiteren Ausführungsform handelt es sich bei dem Wärmetauscher um den Dampferzeuger einer kerntechnischen Anlage. Bei Dampferzeugern in kerntechnischen Anlagen bestehen die Ablagerungen zum überwiegenden Teil aus Magnetit. Besonders vorteilhaft kann mit dem erfindungsgemäßen Verfahren derAccording to a further embodiment, the heat exchanger is the steam generator of a nuclear installation. For steam generators in nuclear facilities, the deposits consist mainly of magnetite. Particularly advantageous can with the inventive method of
Dampferzeuger im Rahmen einer sogenannten Wartungsreinigung (maintenance cleaning) von magnetithaltigen Belägen befreit werden .Steam generators are freed as part of a so-called maintenance cleaning (maintenance cleaning) of magnetite-containing coverings.
Das erfindungsgemäße Verfahren zur Reinigung eines Wärmetauschers wird im folgenden beispielhaft anhand eines Dampferzeugers einer kerntechnischen Anlage näher erläutert. Dabei zeigt die Zeichnung in: Fig. 1 einen stark schematisierten Dampferzeuger in einem Längsschnitt und inThe inventive method for cleaning a heat exchanger will be explained in more detail below by way of example with reference to a steam generator of a nuclear installation. The drawing in: Fig. 1 shows a highly schematic steam generator in a longitudinal section and in
Fig. 2 eine Detailansicht eines solchen Dampferzeugers.Fig. 2 is a detail view of such a steam generator.
Das in dem Reaktorkern eines Druckwasserreaktors erhitzte Primärkühlmittel strömt durch den Primärraum 5 des in Fig. 1 angedeuteten Dampferzeugers 2. Im unteren Teil des Dampferzeugers 2 befindet sich eine Vielzahl von U-förmig gebogenen Rohren 4, die auch als Rohrbündel bezeichnet werden. Aus Grün- den der Übersichtlichkeit sind lediglich zwei U-Rohre 4 dargestellt. Das in den Primärraum 5 eintretende Primärkühlmittel durchströmt die U-Rohre 4 unter Abgabe eines Teils seiner Wärme an ein in dem Sekundärraum 6 vorhandenes Sekundärkühl- mittel. Das dem Dampferzeuger 2 im unteren Bereich des Sekundärraums 6 zugeführte, nunmehr erhitzte bzw. verdampfte Sekundärkühlmittel wird diesem im oberen Bereich entnommen, und zum Betrieb eines Generators verwendet. Im Betrieb des Dampferzeugers 2 bilden sich in dem Sekundärraum 6 Ablagerungen 12. Diese bilden sich im Bereich der Halterungen 8, vor allem aber auf den Außen- oder Mantelseiten der U-Rohre 4 selbst.The heated in the reactor core of a pressurized water reactor primary coolant flows through the primary chamber 5 of the indicated in Fig. 1 steam generator 2. In the lower part of the steam generator 2 is a plurality of U-shaped bent tubes 4, which are also referred to as a tube bundle. For green the sake of clarity, only two U-tubes 4 are shown. The primary coolant entering the primary chamber 5 flows through the U-tubes 4 while giving off part of its heat to a secondary coolant present in the secondary chamber 6. The steam generator 2 in the lower region of the secondary chamber 6 supplied, now heated or evaporated secondary refrigerant is removed from this in the upper area, and used to operate a generator. During operation of the steam generator 2, deposits 12 are formed in the secondary chamber 6. These form in the region of the holders 8, but especially on the outer or shell sides of the U-tubes 4 themselves.
Fig. 2 zeigt einen Ausschnitt des aus Fig. 1 bekannten Dampferzeugers 2 im Bereich der gebogenen U-Rohre 4. Beispielhaft ist ein von Primärkühlmittel durchströmtes U-Rohr 4 dargestellt, das von einer Halterung 8 gehalten ist und eine Bodenplatte 10 durchstoßend in den Primärbereich 5 ausmündet. An den Übergängen zwischen der Halterung 8 und dem U-Rohr 4, sowie an den Übergängen zwischen der Bodenplatte 10 und dem U- Rohr 4, sowie auf der Mantelseite der U-Rohre 4 selbst sind1 shows a section of the steam generator 2 known from FIG. 1 in the region of the bent U-tubes 4. By way of example, a U-tube 4 through which primary coolant flows is shown, which is held by a holder 8 and a bottom plate 10 penetrates into the primary region 5 opens. At the transitions between the holder 8 and the U-tube 4, and at the transitions between the bottom plate 10 and the U-tube 4, as well as on the shell side of the U-tubes 4 are themselves
Ablagerungen 12 vorhanden. Dabei befindet sich der mengenmäßig überwiegende Teil der Ablagerungen 12 auf der Oberfläche der U-Rohre 4 selbst.Deposits 12 available. In this case, the quantitatively predominant part of the deposits 12 is on the surface of the U-tubes 4 itself.
Im Folgenden wird der Ablauf einer zweistufigen Reinigung des Dampferzeugers 2 erläutert, wobei beispielhaft die Ablagerungen zum überwiegenden Teil Eisenoxid (Magnetit) und in geringerem Umfang Kupfer enthalten sollen:The sequence of a two-stage purification of the steam generator 2 will be explained below, wherein by way of example the deposits are to contain for the most part iron oxide (magnetite) and to a lesser extent copper:
Nach Abschalten des Reaktors auf der Primärseite des Dampferzeugers 2, wird zunächst das Sekundärkühlmittel aus dem Dampferzeuger 2 abgelassen. Anschließend wird der Sekundärraum 6 mit einem Unterdruck beaufschlagt bzw. evakuiert. Dabei wird der Unterdruck mindestens so groß gewählt, dass bei der gegebenen Temperatur der Unterdruck ausreichend ist, um das Sekundärkühlmittel, üblicherweise Wasser, zu verdampfen. Alternativ wird der Sekundärraum 6 des Dampferzeugers 2 durch Einleiten von heißer Luft getrocknet. Die Verunreinigungen 12 trocknen unter den beschriebenen Bedingungen sehr schnell, wobei ihre Oberfläche Risse ausbildet. Wie bereits erwähnt, platzen durch den bei der Trocknung auftretenden Volumenverlust die Ablage- rungen teilweise von ihrer Unterlage ab. Die abgeplatztenAfter switching off the reactor on the primary side of the steam generator 2, the secondary coolant is first discharged from the steam generator 2. Subsequently, the secondary space 6 subjected to a vacuum or evacuated. In this case, the negative pressure is chosen to be at least so great that at the given temperature the negative pressure is sufficient to evaporate the secondary coolant, usually water. Alternatively, the secondary space 6 of the steam generator 2 is dried by introducing hot air. The impurities 12 dry very rapidly under the conditions described, with their surface forming cracks. As already mentioned, due to the loss of volume occurring during drying, the deposits partly burst from their base. The chipped
Ablagerungen häufen sich im Bereich des unteren Rohrbodens 10 des Dampferzeugers 2 auf. Der Sekundärraum 6 des Dampferzeugers 2 wird vorzugsweise unter Vakuum gehalten, während in diesen die Reinigungslösung eingebracht wird. Dabei wird der Sekundärraum 6 des Dampferzeugers 2 vorzugsweise bis zur Oberkante des Rohrbündels mit Reinigungslösung gefüllt.Deposits accumulate in the region of the lower tube plate 10 of the steam generator 2. The secondary chamber 6 of the steam generator 2 is preferably kept under vacuum, while in this the cleaning solution is introduced. In this case, the secondary chamber 6 of the steam generator 2 is preferably filled to the upper edge of the tube bundle with cleaning solution.
Die zur Auflösung der Magnetitbeläge eingesetzte Reinigungslösung enthält eine komplexbildende Säure, beispielsweise Ethy- lendiamintetraessigsäure (EDTA), ein Alkalisierungsmittel, beispielsweise Ammoniak, Morpholin oder einer Mischung der genannten Substanzen und ein Reduktionsmittel, beispielsweise Hydrazin. Zur Entfernung der magnetithaltigen Beläge können ebenso andere, allgemein bekannte Reinigungslösungen verwendet werden.The cleaning solution used to dissolve the magnetite coatings contains a complex-forming acid, for example ethylenediaminetetraacetic acid (EDTA), an alkalizing agent, for example ammonia, morpholine or a mixture of the substances mentioned, and a reducing agent, for example hydrazine. To remove the magnetite-containing deposits, other well-known cleaning solutions may also be used.
Zur Verbesserung der Reinigungswirkung wird die Reinigungslösung auf eine Temperatur im Bereich von 400C bis 1600C erhitzt. Dies geschieht vorzugsweise durch Einleiten von Heiß- dampf in den Dampferzeuger. Alternativ wird die Reinigungslösung mit Hilfe der Hauptkühlmittelpumpen über den Primärkreislauf der kerntechnischen Anlage erhitzt. Wird die Reinigungs- lösung soweit erhitzt, dass diese aufkocht, so führt dies zu einer Durchmischung der Reinigungslösung. Alternativ wird zur Durchmischung der Reinigungslösung Inertgas in den Dampferzeuger gepresst. Verbrauchte und unverbrauchte Reinigungslösung werden gemischt, wobei insbesondere unverbrauchte Reinigungslösung an Stellen gerät, an denen noch Ablagerungen 12 vorhanden sind, so dass diese dadurch aufgelöst werden können. Die Ablagerungen 12 werden durch die aufkochende Reinigungslösung zusätzlich mechanisch von den Oberflächen des Dampferzeugers entfernt.To improve the cleaning effect, the cleaning solution is heated to a temperature in the range of 40 0 C to 160 0 C. This is preferably done by introducing hot steam into the steam generator. Alternatively, the cleaning solution is heated by means of the main coolant pump via the primary circuit of the nuclear facility. If the cleaning solution heated to the extent that it boils, this leads to a thorough mixing of the cleaning solution. Alternatively, inert gas is pressed into the steam generator for thorough mixing of the cleaning solution. Spent and unconsumed cleaning solution are mixed, in particular unused cleaning solution in places where still deposits 12 are present, so that they can be resolved. The deposits 12 are additionally removed mechanically by the boiling cleaning solution from the surfaces of the steam generator.
Die von der Reinigungslösung aufgelösten Magnetit-Ablagerungen werden durch Ablassen der Reinigungslösung aus dem Sekundärraum 6 entfernt. Die übrigen, von der Reinigungslösung nicht aufgelösten Magnetit-Ablagerungen, welche aufgehäuft auf dem Rohrboden 10 liegen, werden mechanisch, beispielsweise durch Spülen des Rohrbodens 10, aus dem Sekundärraum 6 entfernt.The magnetite deposits dissolved by the cleaning solution are removed by draining the cleaning solution from the secondary chamber 6. The remaining, not solved by the cleaning solution magnetite deposits, which are piled on the tube sheet 10 are removed mechanically, for example by rinsing the tube sheet 10, from the secondary chamber 6.
Bevor anschließend die kupferhaltigen Ablagerungen 12 aus dem Dampferzeuger 2 entfernt werden, wird dieser erneut getrocknet. Dieser weitere Trocknungsschritt führt erneut zu einer physikalischen/mechanischen Destabilisierung der nach dem ersten Reinigungsschritt übrig gebliebenen Ablagerungen 12.Before the copper-containing deposits 12 are subsequently removed from the steam generator 2, it is dried again. This further drying step again leads to a physical / mechanical destabilization of the deposits 12 remaining after the first cleaning step.
Die kupferhaltigen Ablagerungen 12 werden aufgelöst, indem wasserlösliche Komplexe der Kupferverbindungen gebildet werden. Als Komplexbildner ist beispielsweise Ethylendiamin (EDA) , Ethylendiamintetraessigsäure (EDTA) in amoniakalischer Lösung unter oxidierenden Bedingungen geeignet. Oxidierende Bedingungen werden beispielsweise durch Zudosieren von Wasserstoffperoxid und/oder Einblasen von Luft oder Sauerstoff erreicht. Nach erfolgter Auflösung der kupferhaltigen Ablage- rungen 12, wird die Reinigungslösung aus dem Dampferzeuger 2 abgelassen . The copper-containing deposits 12 are dissolved by forming water-soluble complexes of the copper compounds. As a complexing agent, for example, ethylenediamine (EDA), ethylenediaminetetraacetic acid (EDTA) in amoniakalischer solution under oxidizing conditions is suitable. Oxidizing conditions are achieved, for example, by metering in hydrogen peroxide and / or blowing in air or oxygen. After the dissolution of the copper-containing storage ments 12, the cleaning solution is discharged from the steam generator 2.

Claims

Ansprüche claims
1. Verfahren zur Reinigung des im Betrieb von einem Sekundärkühlmittel durchströmten Sekundärraumes (6) eines Wärmetauschers (2) einer kerntechnischen Anlage, von während des Betriebes an und auf den Oberflächen des Sekundärraumes (6) gebildeten Ablagerungen (12), gekennzeichnet durch die folgen- den Schritte:1. A process for purifying the secondary space (6) through which a secondary coolant flows during operation of a heat exchanger (2) of a nuclear installation, of deposits (12) formed during operation and on the surfaces of the secondary space (6), characterized by the following the steps:
- Trocknen der Ablagerungen (12) bei von dem Sekundärkühlmittel überwiegend entleertem Sekundärraum (6),Drying of the deposits (12) in the case of the secondary coolant (6) which is predominantly emptied by the secondary coolant,
- Einbringen einer Reinigungslösung in den Sekundärraum (6).- Introduce a cleaning solution in the secondary chamber (6).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Sekundärraum (6) zur Trocknung der Ablagerungen (12) mit Unterdruck beaufschlagt wird.2. The method according to claim 1, characterized in that the secondary space (6) for drying the deposits (12) is subjected to negative pressure.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Reinigungslösung in den mit Unterdruck beaufschlagten Sekundärraum (6) eingebracht wird.3. The method according to claim 1 or 2, characterized in that the cleaning solution is introduced into the pressurized with negative pressure secondary chamber (6).
4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Reinigungslösung auf eine Temperatur zwischen 400C und 1600C erhitzt wird. 4. The method according to any one of the preceding claims, characterized in that the cleaning solution is heated to a temperature between 40 0 C and 160 0 C.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Reinigungslösung dadurch erhitzt wird, dass Heißdampf in den Sekundärraum (6) eingeleitet wird.5. The method according to claim 4, characterized in that the cleaning solution is heated by hot steam is introduced into the secondary chamber (6).
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Reinigungslösung in dem Sekundärraum (6) zum Sieden ge- bracht wird.6. The method according to any one of the preceding claims, characterized in that the cleaning solution in the secondary chamber (6) is brought to boiling.
7. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die in dem Sekundärraum (6) vorhandenen Ablagerungen (12) zumindest teilweises durch Spülen, aus diesem entfernt werden,7. The method according to any one of the preceding claims, characterized in that in the secondary chamber (6) existing deposits (12) are at least partially removed by rinsing, from this
8. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Sekundärraum (6) des Wärmetauschers (2) von Ablagerungen (12) gereinigt wird, die überwiegend magnetithaltig sind.8. The method according to any one of the preceding claims, characterized in that the secondary space (6) of the heat exchanger (2) of deposits (12) is cleaned, which are predominantly magnetite.
9. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass als Wärmetauscher der Dampferzeuger (2) einer kerntechnischen Anlage gereinigt wird. 9. The method according to any one of the preceding claims, characterized in that is cleaned as a heat exchanger of the steam generator (2) of a nuclear facility.
EP08871095.9A 2008-01-18 2008-12-23 Method for cleaning a heat exchanger Not-in-force EP2244848B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008005199.3A DE102008005199B4 (en) 2008-01-18 2008-01-18 Process for cleaning a heat exchanger
PCT/EP2008/068258 WO2009089991A2 (en) 2008-01-18 2008-12-23 Method for cleaning a heat exchanger

Publications (2)

Publication Number Publication Date
EP2244848A2 true EP2244848A2 (en) 2010-11-03
EP2244848B1 EP2244848B1 (en) 2015-04-08

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EP08871095.9A Not-in-force EP2244848B1 (en) 2008-01-18 2008-12-23 Method for cleaning a heat exchanger

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US (1) US20100313913A1 (en)
EP (1) EP2244848B1 (en)
JP (1) JP5627468B2 (en)
KR (1) KR20100123696A (en)
AR (1) AR070183A1 (en)
CA (1) CA2706303A1 (en)
DE (1) DE102008005199B4 (en)
ES (1) ES2537807T3 (en)
WO (1) WO2009089991A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8999072B2 (en) 2008-12-03 2015-04-07 Westinghouse Electric Company Llc Chemical cleaning method and system with steam injection
DE102010039413B4 (en) * 2010-08-17 2012-03-29 Areva Np Gmbh Method and device for taking a sample from a steam generator
CN103182389B (en) * 2011-12-30 2016-01-27 中国原子能科学研究院 Physical and chemical mixed cleaning process for reactor heat exchanger
WO2015044709A1 (en) 2013-09-24 2015-04-02 Gd Energy Services, S.A.R.L. Chemical cleaning procedure for heat exchangers
JP7067217B2 (en) * 2018-04-09 2022-05-16 株式会社Soken Heat exchanger
JP6938421B2 (en) * 2018-04-17 2021-09-22 株式会社神戸製鋼所 Fluid flow device
US20220331846A1 (en) * 2021-04-16 2022-10-20 BWXT Isotope Technology Group, Inc. Clean-in-place and product recovery method

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB849053A (en) * 1958-11-18 1960-09-21 Exxon Research Engineering Co Removing deposits from oil fired furnaces
US3013909A (en) * 1960-03-31 1961-12-19 Guyon P Pancer Method of chemical decontamination of stainless steel nuclear facilities
DE2817435A1 (en) * 1978-04-21 1979-10-31 Cleamax Ltd METHOD AND DEVICE FOR THE SURFACE TREATMENT OF OBJECTS
US4277289A (en) * 1978-07-19 1981-07-07 Aluminum Pechiney Process for removing titaniferous and silico-aluminous incrustations from surfaces
DD147718A1 (en) * 1979-12-05 1981-04-15 Bernhard Wimmler ARRANGEMENT FOR THE THERMAL CLEANING OF SURFACE CONDENSERS
CA1215967A (en) * 1982-11-22 1986-12-30 Jan Kramb Cleaning of heat exchangers
DE3243114C1 (en) * 1982-11-22 1984-05-30 Jan Ing.(grad.) 6540 Simmern Kramb Method for cleaning heat exchangers for exhaust gases from internal combustion engines of stationary plants
DE3533886A1 (en) * 1985-04-16 1987-03-26 Kraftwerk Union Ag CLEANING PROCEDURE
EP0273182B1 (en) 1986-12-01 1991-07-31 Siemens Aktiengesellschaft Method of cleaning a container
US5082502A (en) * 1988-09-08 1992-01-21 Cabot Corporation Cleaning apparatus and process
FR2708628B1 (en) * 1993-07-29 1997-07-18 Framatome Sa Method of chemical cleaning of metallic material parts.
JP2831333B2 (en) * 1996-08-29 1998-12-02 ウエスチングハウス・エレクトリック・コーポレイション Removal method of deposits such as sludge
DE19821336C1 (en) 1998-04-23 1999-06-10 Masch Und Werkzeugbau Gmbh Chuck fitting system and roll store
CA2345096A1 (en) * 1998-09-23 2000-03-30 C S Energy Ltd. Exfoliated magnetite removal system and controllable force cooling for boilers
DE19857342A1 (en) 1998-12-11 2000-02-17 Siemens Ag Cleaning of container, especially a nuclear power plant steam generator, by modifying the solution resulting from iron oxide dissolution to dissolve copper and/or copper compounds before emptying the container
GB9828333D0 (en) * 1998-12-23 1999-02-17 Crown Cork & Seal Tech Corp Rinsing device
SE518075C2 (en) * 2000-12-07 2002-08-20 Stora Kopparbergs Bergslags Ab Ways of Removing Hard Soluble Coatings
AU2003248720A1 (en) * 2002-06-17 2003-12-31 Basf Corporation Method for scale removal
DE10238730A1 (en) 2002-08-23 2004-03-04 Framatome Anp Gmbh Process for cleaning the steam generator of a pressurized water reactor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009089991A2 *

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WO2009089991A2 (en) 2009-07-23
WO2009089991A3 (en) 2009-12-10
ES2537807T3 (en) 2015-06-12
JP5627468B2 (en) 2014-11-19
US20100313913A1 (en) 2010-12-16
DE102008005199A1 (en) 2009-07-30
KR20100123696A (en) 2010-11-24
DE102008005199B4 (en) 2014-01-23
AR070183A1 (en) 2010-03-17
EP2244848B1 (en) 2015-04-08
JP2011511918A (en) 2011-04-14
CA2706303A1 (en) 2009-07-23

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