EP1598629B1 - Method of chemical cleaning of a gas and vapor installation - Google Patents

Method of chemical cleaning of a gas and vapor installation Download PDF

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Publication number
EP1598629B1
EP1598629B1 EP04011890A EP04011890A EP1598629B1 EP 1598629 B1 EP1598629 B1 EP 1598629B1 EP 04011890 A EP04011890 A EP 04011890A EP 04011890 A EP04011890 A EP 04011890A EP 1598629 B1 EP1598629 B1 EP 1598629B1
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EP
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Prior art keywords
plant
deionate
circulation
volumes
pipes
Prior art date
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EP04011890A
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German (de)
French (fr)
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EP1598629A1 (en
Inventor
Heinz-Peter Borchardt
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Therm-Service fur Kraftwerke und Industrie GmbH
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Therm-Service fur Kraftwerke und Industrie GmbH
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Priority to EP04011890A priority Critical patent/EP1598629B1/en
Priority to AT04011890T priority patent/ATE313056T1/en
Priority to ES04011890T priority patent/ES2255694T3/en
Priority to DE502004000183T priority patent/DE502004000183D1/en
Publication of EP1598629A1 publication Critical patent/EP1598629A1/en
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Publication of EP1598629B1 publication Critical patent/EP1598629B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/52—Washing-out devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents

Definitions

  • the invention is therefore based on the object, the beginning to improve said method of chemical cleaning in such a way that its need for demineralised or fully desalted Water is significantly reduced and an economically water saving concept is set up.
  • the pickling and cleaning chemicals of Stage e directly into the degreasing solution of stages c and d dosed in, without the degreasing solution previously from the Plant was removed. This eliminates numerous intermediate rinse steps; also, by heating the wetting agent or degreasing solution in stages c and d the effect of the same elevated.
  • the method according to the invention achieves this Same procedural result as the prior art with lower plant volumes in that after the first Pre-rinse all treatments to be done in the circulation, what becomes possible by that between the network agent solution and the pickling / cleaning solution no negavtiven reactions occur, i. the hydrofluoric acid reacts with the inhibitor not with the wetting agent of degreasing.
  • the schematic sketch of FIG. 1 shows the boiler system to be cleaned, generally designated 3.
  • the boiler plant 3 is from an external circulation pump 1 from the associated Mixing container 2 with the desired chemical dosage 7 (Wetting agent solution ((TS LT 711)) and / or inhibited with Rodine 31 A. Hydrofluoric acid) and the deionate 9. Other products for the surfactant solution and the inhibitor are commercially available.
  • the line circuit has a by-pass with filter 4, which is backwashable. At the by-pass are backwash connections 5 and 6 connected.
  • the exit for the to be disposed of Solutions is labeled 8. It's for control the method according to the invention provides numerous valves, which are indicated at 11 to 20. In the boiler plant 3 there is an evaporator 22, while in between a superheater 21 is provided. It will be clear that the system Display instruments for the desired parameters. Also belong to the deionized supply appropriate tanks and a corresponding water treatment plant (not shown).
  • the plant valves After preparing the plant components to be treated and all temporary ports and connections have been created are, the plant valves must be 11 - 20 according to a valve position list closed or opened.
  • the first step after filling the system is pre-wash with deionized, for coarse impurities and loose dirt particles to remove.
  • the rinsing is done in the open-circuit method (OC method) with a pipe speed of> 0.5 m / s.
  • the prewash is complete when the turbidity at the outlet 8 of System falls below the limit specified below.
  • the aim is to reach the limit as soon as possible, to the water consumption as possible to a half to a maximum to limit an investment volume.
  • the system is of the OC method (open circuit) switched to circuit switching.
  • Pre-rinsing the system removes loose particles Service. As the pipeline surfaces and heating surfaces through However, transport and assembly are contaminated with oils and greases must be treated with wetting agents become.
  • Wetting agents form hydrophobic surfaces converted into hydrophilic to the water-based cleaning solution Contact with all surfaces to be cleaned enable.
  • the degreasing solution is at the circulation pump 1 directly into the Mixing container 2 dosed. It becomes a nonionic, biological degradable and suitable for a wide temperature range Wetting agent used. In addition, according to the invention ensured that the wetting agent with the inhibitor used Cleaning solution tolerates.
  • the wetting agent is metered in the circulation process until the Wetting agent solution reaches a concentration of about 0.05% Has.
  • the exposure time of the wetting agent solution should be at least 3 hours last for. During this exposure time, the wetting agent solution becomes heated to 50 - 80 ° C.
  • the wetting agent solution becomes continued in the circulation circuit. While The circulation of the wetting agent solution can produce larger particles be detached from the surfaces. These particles> 100 ⁇ m be by means of a built-in by-pass microfilter. 4 removed from the system.
  • the microfilter 4 has a capacity of 200 m 3 / h, filter size 100 microns.
  • the system is heated in the circulation circuit, m the reaction rate and the efficiency of the acid solution too increase. Doubled with the increase in temperature by 10 ° C the reaction rate of a chemical reaction. It is therefore ensured that the highest possible temperature is reached.
  • the system is heated to 50-80 ° C.
  • a heat source Serves either by the operator provided auxiliary steam or a separate oil-fired hot water boiler.
  • the heat exchanger is designed so that a temperature be reached from about 50 - 80 ° C within 6 - 10 hours can.
  • the heating of the systems must be stopped as soon as a temperature from 50 - 80 ° C at the return 10 is detected.
  • the circulation circuit will continue to be maintained.
  • the cleaning solution consists of Rodine inhibited 1% Hydrofluoric acid.
  • the hydrofluoric acid and the inhibitor Rodine are over the mixing container of the circulation pump 1 in the circulation process dosed directly into the wetting agent solution, with it It should be noted that the wetting agent and the inhibited hydrofluoric acid do not affect each other negatively.
  • the flow rate of the cleaning solution in the too treated piping is usually 0.2 m / s.
  • the concentration of dissolved iron must be the maximum iron concentration do not exceed.
  • the monitoring values are given below.
  • the cleaning is finished when the iron concentration at free acid is constant. With the achievement of constant Values, the circulation circulation is stopped. All valves (Inlet 20 and return 11) are closed. Yes according to plant type The acid can now remain in the system for up to 12 hours (Stance phase) to increase the cleaning performance.
  • Stage g displacing the acid and purging for conductivity
  • the acid is purged with deionized from the system repressed. After bleeding the system, all sections must and sections are checked for conductivity. This is using high-speed process with auxiliary pumps carried out.
  • the monitoring values are given below. As soon as the Values at the drains / drains of the system detectable are there, high-speed rinsing is over.
  • the entire system is after flushing with conductivity Deionat filled.
  • the circulation circuit is resumed.
  • ammonia water becomes metered into the system.
  • ammonia is the pH raised to> 10.2.
  • hydrogen peroxide becomes dosed into the circulation.
  • This oxidizing agent causes the formation of a passive layer on the stained, neutralized Metal surface. Passivation is completed when a positive redox potential is measured. The monitoring values are listed below.
  • the passivation solution is removed from the system and the sections statically, by geodetic height, emptied. If necessary, the auxiliary pumps for emptying used by the system.
  • the wastewater basin serves as intermediate storage.
  • the liquid acid concentration in the waste water is in the range between 0.01% to 0.2%.
  • the wastewater contains the inhibitor used and dissolved iron ions (Fe ++ ).
  • the pickling solution becomes online during the suppression with hydrated lime pre-neutralized. Following the pickling, the Waste water in the wastewater tank according to marre addition neutralized by hydrated lime.
  • the organic components of the wastewater are adsorbed separated on activated charcoal by adding powdered activated carbon is added to the wastewater.
  • the hydrofluoric acid reacts with the hydrated lime to form fluorspar (CaF 2 ) and water.
  • fluorspar (CaF 2 )
  • the water-insoluble fluorspar, the precipitated iron hydroxide Fe (OH) 3 and the activated carbon settle out.
  • the waste water from the alkalization and passivation contains Ammonia and hydrogen peroxide. This wastewater is in one additional wastewater tank, since it does not match the Fluid wastewater from the dressing can be mixed.
  • the wastewater is discharged via a water treatment plant in cation / anion exchange with upstream activated carbon filter. This ensures that both the dissolved ions retained, as well as the COD content of the water reduced becomes.
  • the wastewater has a temperature of max. 35 ° C.
  • the treated wastewater can be easily processed via the service or raw water returned to the water cycle of the plant become.
  • the precipitated calcium fluoride salts and the iron oxide forms together with the activated carbon a thin sludge mixture.
  • This Thin sludge also contains the purged out of the plant Solids.
  • the thin sludge is pressed off via a chamber filter press.
  • the resulting filter cake (water content 45-55%) is in Covered containers until disposal on a suitable Landfill temporarily stored. An approved local waste disposal company is assigned with the professional disposal. If necessary, the filter cake is examined by laboratory chemistry.
  • the permeate is discharged into the sewer. During the Delivery, the wastewater values are monitored.
  • the inventive method ensures that the treated Surfaces free of rust, scale and imitation Magnetite are.
  • the maximum total removal of iron during treatment will not exceed 20 g / m 2 , which also applies to chromium steels.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The cleaning process involves filling the plant with demineralized water, checking seals, flushing with two system volumes of demineralized water, dosing a degreaser into the pump (1), heating to 50-80 deg. C, dosing in a cleaning fluid, checking iron concentration, expelling HF acids, restarting the circulation and raising the pH value to 10.0. A passive layer of hydrogen peroxide is then dosed in to form a passive layer on the metal until a positive Redox potential of more than 10 mV is reached. The system is then flushed out again.

Description

Derartige Verfahren sind in unterschiedlichen Ausführungsformen im Stand der Technik bekannt. Es wird hierzu beispielsweise verwiesen auf die VGB-Richtlinie R 513, von 2002- sowie auf die Patentschrift DE 198 43 442.Such methods are in different embodiments known in the art. It is for this purpose, for example referred to the VGB guideline R 513, from 2002- as well as to the Patent DE 198 43 442.

Nachteilig hat sich bei diesen Anlagen, die üblicherweise eine Leistung von zur Zeit bis 1000 MW besitzen, der extrem hohe Wasserverbrauch bemerkbar gemacht, der aus den Maßnahmen der Beizung/chemischen Reinigung (VGB-Standard: ca. zwölf Anlagenvolumina Deionat) entsteht. Diese Anlagenvolumina verteilen sich auf das Füllen und Vorspülen, bei dem üblicherweise drei Anlagenvolumina erforderlich sind. Beim Entfetten und Spülen auf Trübung werden ein bzw. weitere drei Anlagenvolumina benötigt, sowie beim Beizen und Spülen auf Gleitfähigkeit zusätzlich ein bzw. vier Anlagenvolumina. Es sind also zahlreiche Zwischenspülschritte erforderlich. Häufig ist allerdings nur eine begrenzte Verfügbarkeit an demineralisiertem oder voll entsalztem Wasser (Deionat) oder eine nicht ausreichende Rohrwasserversorgung vorhanden. Des Weiteren wird auch aus wirtschaftlichen und ökologischen Gründen immer eine Reduzierung des Wasserverbrauchs angestrebt.The disadvantage of these systems, which is usually a Power of currently up to 1000 MW own, the extremely high Water consumption made noticeable, resulting from the measures of Pickling / dry cleaning (VGB standard: approx. Twelve plant volumes Deionate) is formed. Distribute these asset volumes on filling and prewashing, which is usually three Investment volumes are required. When degreasing and rinsing turbidity requires one or more three volumes of equipment, as well as for pickling and rinsing for lubricity in addition one or four investment volumes. So there are many Intermediate rinse steps required. Often, however, only limited availability of demineralized or full desalinated water (deionized water) or insufficient water supply available. Furthermore, also from economic and ecological reasons always a reduction of water consumption.

Der Erfindung liegt deshalb die Aufgabe zugrunde, das eingangs genannte Verfahren zum chemischen Reinigen derart zu verbessern, dass sein Bedarf an demineralisiertem oder voll entsalztem Wasser erheblich verringert und ein wirtschaftlich Wasser sparendes Konzept aufgestellt wird.The invention is therefore based on the object, the beginning to improve said method of chemical cleaning in such a way that its need for demineralised or fully desalted Water is significantly reduced and an economically water saving concept is set up.

In überraschender Weise wird diese Aufgabe oder das bestehende Problem dadurch gelöst, dass das Verfahren die nachstehend beschriebenen Stufen aufweist, die zusammen mit ihren Parametern und Stoffen fein aufeinander abgestimmt sind und maximal sechs Anlagenvolumina Deionat verbrauchen:

  • a. Füllen der Anlage mit Deionat, Entlüften und Abdrücken der Leitungen zum Überprüfen der Dichtigkeit, ggf. Beseitigen von Undichtigkeiten,
  • b. Vorspülen mit maximal zwei Anlagenvolumina Deionat zum Beseitigen von groben Verunreinigungen im Open-Circuit (OC)-Verfahren mit einer Geschwindigkeit von > 0,5 m/s bis die Trübung am Austritt (8) = < 0,5 (photometrisch 435 nm, 50 mm Küvette) unterschreitet,
  • c. Zudosieren einer Netzmittellösung (Entfetten) an der Pumpstation (2) in den Mischtank im Kreislaufbetrieb zum Beseitigen von Öl- und Fettresten bis sie eine Konzentration von 0,05 - 0,1 Vol. % erreicht hat, einwirken lassen von mindestens 2 Std. während des Aufheizens auf eine Temperatur von 50-80°C,
  • d. Beenden des Aufheizens, nachdem eine Temperatur von 50-80°C am Rücklauf 10 eingestellt ist,
  • e. Zudosieren einer mit der Netzmittellösung verträglichen Beiz-/Reinigungslösung in Form von etwa 0,8 - 1,5 Vol. % inhibierter Flusssäure über den Mischtank der Pumpstation im Kreislaufverfahren bei einer Strömungsgeschwindigkeit von > 0,2 m/s in den zu behandelnden Rohrleitungen,
  • f. mehrfaches Bestimmen der Konzentration von Fe-Konzentration bei ausreichend freier HF Säure bis die Fe-Werte konstant sind,
  • g. Verdrängen der HF-Säure mittels Zugabe von maximal vier Anlagenvolumina Deionat für die Spülung, Entlüften der Anlage, Prüfung auf Leitfähigkeit im Hochgeschwindigkeitsverfahren bis dieselbe < 10 bzw. 20 µs/cm über dem Eingangswert liegt,
  • h. Wiederaufnehmen des Zirkulationskreislaufs und Anheben des pH-Wertes auf > 10,0 (Alkalisieren) Zudosieren von H2O2 zum Ausbilden einer Passivschicht auf den Metallinnenflächen der Leitungen bis ein positives Redox-Potential > +10mV gemessen wird,
  • i. Spülen sämtlicher Leitungen, Entleeren der vorhandenen Lösungen.
    • Surprisingly, this object or the existing problem is solved in that the method has the steps described below, which are fine-tuned together with their parameters and materials and consume a maximum of six plant volumes of deionized:
  • a. Filling the system with deionized water, venting and pressing off the lines to check for leaks, if necessary, to eliminate leaks,
  • b. Pre-rinse with a maximum of two system volumes of deionized water to remove coarse impurities in the open-circuit (OC) process at a rate of> 0.5 m / s until the turbidity at the outlet (8) = <0.5 (photometric 435 nm, 50 mm cuvette),
  • c. Dosing a wetting agent solution (degreasing) at the pumping station (2) in the mixing tank in circulation operation for removing oil and grease residues until it has reached a concentration of 0.05-0.1 vol.%, Allow to act for at least 2 hours during heating to a temperature of 50-80 ° C,
  • d. Stopping the heating after a temperature of 50-80 ° C is set at the return 10,
  • e. Metering in a pickling / cleaning solution which is compatible with the wetting agent solution in the form of about 0.8-1.5% by volume inhibited hydrofluoric acid via the mixing tank of the pumping station in the circulation process at a flow rate of> 0.2 m / s in the pipes to be treated,
  • f. repeatedly determining the concentration of Fe concentration with sufficient free HF acid until the Fe values are constant,
  • G. Displacement of the HF acid by adding a maximum of four system volumes of deionized water for purging, venting the system, testing for high-speed conductivity until it is <10 or 20 μs / cm above the input value,
  • H. Resuming the circulation and raising the pH to> 10.0 (alkalization) metering H 2 O 2 to form a passive layer on the metal inner surfaces of the leads until a positive redox potential> + 10mV is measured,
  • i. Rinse all lines, empty existing solutions.

    • Erfindungsgemäß werden die Beiz- und Reinigungschemikalien der Stufe e direkt in die Entfettungslösung der Stufen c und d hineindosiert, ohne dass die Entfettungslösung vorher aus der Anlage entfernt wurde. Dadurch entfallen zahlreiche Zwischenspülschritte; auch wird durch das Aufheizen der Netzmittel- bzw. Entfettungslösung in den Stufen c und d die Wirkung derselben erhöht.According to the invention, the pickling and cleaning chemicals of Stage e directly into the degreasing solution of stages c and d dosed in, without the degreasing solution previously from the Plant was removed. This eliminates numerous intermediate rinse steps; also, by heating the wetting agent or degreasing solution in stages c and d the effect of the same elevated.

    Anders ausgedrückt, das erfindungsgemäße Verfahren erzielt das gleiche verfahrenstechnische Ergebnis wie der Stand der Technik mit geringeren Anlagenvolumina dadurch, dass nach dem ersten Vorspülen alle Behandlungen im Kreislauf durchgeführt werden, was dadurch möglich wird, dass zwischen der Netzmittellösung und der Beiz-/Reinigungslösung keine negavtiven Reaktionen auftreten, d.h. die Flusssäure mit dem Inhibitor reagiert nicht mit dem Netzmittel der Entfettung.In other words, the method according to the invention achieves this Same procedural result as the prior art with lower plant volumes in that after the first Pre-rinse all treatments to be done in the circulation, what becomes possible by that between the network agent solution and the pickling / cleaning solution no negavtiven reactions occur, i. the hydrofluoric acid reacts with the inhibitor not with the wetting agent of degreasing.

    Vorteilhafterweise werden im Extremfall nur 3,5 Anlagenvolumina Deionat insgesamt verbraucht, was gegenüber den zwölf Anlagenvolumina des Standes der Technik eine erhebliche Reduzierung darstellt.Advantageously, in extreme cases, only 3.5 system volumes Deionat consumed a total of, compared to the twelve plant volumes The prior art, a significant reduction represents.

    Weitere Vorteile und Merkmale der vorliegenden Erfindung gehen aus den Unteransprüchen hervor, die auch gemeinsam mit dem Hauptanspruch von erfinderischer Bedeutung sein können.Further advantages and features of the present invention are going From the dependent claims, which also together with the Main claim may be of inventive importance.

    Im folgenden wird ein bevorzugtes Ausführungsbeispiel anhand der Zeichnung zum besseren Verständnis der Erfindung erläutert. Es dürfte jedoch einleuchten, dass die Erfindung nicht auf dieses Ausführungsbeispiel beschränkt ist. Es zeigt:

  • Fig. 1 eine Schemaskizze der Anlage, die mit dem erfindungsgemäßen Verfahren chemisch gereinigt wird.
    • In the following a preferred embodiment will be explained with reference to the drawing for a better understanding of the invention. It will be understood, however, that the invention is not limited to this embodiment. It shows:
  • Fig. 1 is a schematic sketch of the system, which is chemically cleaned by the method according to the invention.

    • Die Schemaskizze der Fig. 1 zeigt die zu reinigende Kesselanlage, die allgemein mit 3 bezeichnet ist. Die Kesselanlage 3 wird von einer externen Umwälzpumpe 1 aus dem damit verbundenen Mischbehälter 2 mit der gewünschten Chemikaliendosierung 7 (Netzmittellösung ((TS LT 711)) und/oder mit Rodine 31 A inhibierte Flusssäure) und dem Deionat 9 versorgt. Andere Produkte für die Netzmittellösung und den Inhibitor sind im Handel erhältlich. Der Leitungskreislauf weist einen by-pass mit Filter 4 auf, der rückspülbar ist. An den by-pass sind Rückspülanschlüsse 5 und 6 angeschlossen. Der Austritt für die zu entsorgenden Lösungen ist mit 8 bezeichnet. Es sind zur Steuerung des erfindungsgemäßen Verfahrens zahlreiche Ventile vorgesehen, die bei 11 bis 20 angedeutet sind. In der Kesselanlage 3 befindet sich ein Verdampfer 22, während dazwischen ein Überhitzer 21 vorgesehen ist. Es dürfte einleuchten, dass das System Anzeigeinstrumente für die gewünschten Parameter aufweist. Ebenso gehören zur Deionat-Versorgung entsprechende Tanks und eine entsprechende Wasseraufbereitungsanlage (nicht gezeigt).The schematic sketch of FIG. 1 shows the boiler system to be cleaned, generally designated 3. The boiler plant 3 is from an external circulation pump 1 from the associated Mixing container 2 with the desired chemical dosage 7 (Wetting agent solution ((TS LT 711)) and / or inhibited with Rodine 31 A. Hydrofluoric acid) and the deionate 9. Other products for the surfactant solution and the inhibitor are commercially available. The line circuit has a by-pass with filter 4, which is backwashable. At the by-pass are backwash connections 5 and 6 connected. The exit for the to be disposed of Solutions is labeled 8. It's for control the method according to the invention provides numerous valves, which are indicated at 11 to 20. In the boiler plant 3 there is an evaporator 22, while in between a superheater 21 is provided. It will be clear that the system Display instruments for the desired parameters. Also belong to the deionized supply appropriate tanks and a corresponding water treatment plant (not shown).

    Nachfolgend wird das Wasser- bzw. Deionat sparende erfindungsgemäße Verfahren der chemischen Reinigung des Wasser-Dampf-Kreislaufs mit Flusssäure nach dem Zirkulationsverfahren beschrieben, wobei für sämtliche Verfahrensschritte vollentsalztes Wasser eingesetzt wird.Hereinafter, the water or deionized saving inventive Method of dry cleaning the water-steam cycle described with hydrofluoric acid according to the circulation method, demineralized for all process steps Water is used.

    Stufe a. Füllen und Dichtigkeitsprüfung Stage a. Filling and leak testing

    Nachdem die zu behandelnden Anlagenkomponenten vorbereitet und alle temporären Anschlüsse und Verbindungen erstellt worden sind, müssen die Anlagenventile 11 - 20 gemäß einer Ventilstellungsliste geschlossen, bzw. geöffnet werden.After preparing the plant components to be treated and all temporary ports and connections have been created are, the plant valves must be 11 - 20 according to a valve position list closed or opened.

    Während des langsamen Füllens der Anlage mit Wasser wird die Dichtigkeit des Systems kontrolliert. Sobald das System gefüllt und entlüftet ist, werden alle Leitungen, einschl. der temporären Rohrleitungen und provisorischen Verbindungen mit dem maximalen Pumpendruck (oder max. 10 bar) abgedrückt.During the slow filling of the system with water, the Tightness of the system controlled. Once the system is filled and vented, all lines, including the temporary pipelines and temporary connections with Pressed down to the maximum pump pressure (or 10 bar max.).

    Evtl. auftretende Undichtigkeiten werden beseitigt. Die Dichtigkeit des Systems wird in einem Druckprobenprotokoll festgehalten.Possibly. occurring leaks are eliminated. The tightness of the system is recorded in a pressure test record.

    Stufe b. Vorspülen auf niedrige Trübung Stage b. Pre-wash for low turbidity

    Der erste Schritt nach dem Füllen des Systems ist das Vorspülen mit Deionat, um grobe Verunreinigungen und lose Schmutzpartikel zu entfernen. Das Spülen erfolgt im Open-Circuit-Verfahren (OC-Verfahren) mit einer Rohrleitungsgeschwindigkeit von > 0,5 m/s. The first step after filling the system is pre-wash with deionized, for coarse impurities and loose dirt particles to remove. The rinsing is done in the open-circuit method (OC method) with a pipe speed of> 0.5 m / s.

    Das Vorspülen ist beendet, wenn die Trübung am Austritt 8 des Systems den weiter unten angegebenen Grenzwert unterschreitet.The prewash is complete when the turbidity at the outlet 8 of System falls below the limit specified below.

    Es wird angestrebt, den Grenzwert schnellstmöglich zu erreichen, um den Wasserverbrauch möglichst auf ein halbes bis maximal ein Anlagevolumen zu begrenzen.The aim is to reach the limit as soon as possible, to the water consumption as possible to a half to a maximum to limit an investment volume.

    Nachdem das Vorspülen beendet ist, wird das System vom OC-Verfahren (offener Kreislauf) auf Kreislaufschaltung umgestellt.After the pre-purge is completed, the system is of the OC method (open circuit) switched to circuit switching.

    Stufe c: Dosierung von Netzmittel Stage c: dosage of wetting agent

    Durch das Vorspülen des Systems sind lose Partikel entfernt worden. Da die Rohrleitungsoberflächen und Heizflächen durch den Transport und die Montage jedoch mit Ölen und Fetten verschmutzt sein können, muss eine Behandlung mit Netzmittel vorgesehen werden.Pre-rinsing the system removes loose particles Service. As the pipeline surfaces and heating surfaces through However, transport and assembly are contaminated with oils and greases must be treated with wetting agents become.

    Durch die Netzmittelbehandlung werden hydrophobe Oberflächen in hydrophile überführt, um der auf Wasser basierenden Reinigungslösung Kontakt mit allen zu reinigenden Oberflächen zu ermöglichen.Wetting agents form hydrophobic surfaces converted into hydrophilic to the water-based cleaning solution Contact with all surfaces to be cleaned enable.

    Die Entfettungslösung wird an der Umwälzpumpe 1 direkt in den Mischbehälter 2 dosiert. Es wird ein nichtionisches, biologisch abbaubares und für einen großen Temperaturbereich geeignetes Netzmittel verwendet. Zudem wird erfindungsgemäß darauf geachtet, dass sich das Netzmittel mit dem Inhibitor der eingesetzten Reinigungslösung verträgt.The degreasing solution is at the circulation pump 1 directly into the Mixing container 2 dosed. It becomes a nonionic, biological degradable and suitable for a wide temperature range Wetting agent used. In addition, according to the invention ensured that the wetting agent with the inhibitor used Cleaning solution tolerates.

    Das Netzmittel wird im Kreislaufverfahren dosiert, bis die Netzmittellösung eine Konzentration von ca. 0,05 % erreicht hat. The wetting agent is metered in the circulation process until the Wetting agent solution reaches a concentration of about 0.05% Has.

    Die Einwirkzeit der Netzmittellösung sollte mindestens 3 Stunden andauern. Während dieser Einwirkzeit wird die Netzmittellösung auf 50 - 80°C aufgeheizt.The exposure time of the wetting agent solution should be at least 3 hours last for. During this exposure time, the wetting agent solution becomes heated to 50 - 80 ° C.

    Das Verdrängen der Netzmittellösung nach dem Stand der Technik entfällt.The displacement of the wetting solution according to the prior art eliminated.

    Nachdem das Netzmittel dosiert worden ist, wird die Netzmittellösung weiter im Zirkulationskreislauf gefahren. Während der Zirkulation der Netzmittellösung können größere Partikel von den Oberflächen gelöst werden. Diese Partikel > 100 µm werden mittels eines im by-pass installierten Mikrofilters 4 aus dem System entfernt.After the wetting agent has been metered, the wetting agent solution becomes continued in the circulation circuit. While The circulation of the wetting agent solution can produce larger particles be detached from the surfaces. These particles> 100 μm be by means of a built-in by-pass microfilter. 4 removed from the system.

    Der Mikrofilter 4 hat eine Kapazität von 200 m3/h, Filtergröße 100 µm.The microfilter 4 has a capacity of 200 m 3 / h, filter size 100 microns.

    Das System wird im Zirkulationskreislauf aufgeheizt, m die Reaktionsgeschwindigkeit und die Effizienz der Säurelösung zu erhöhen. Mit der Zunahme der Temperatur um 10°C verdoppelt sich die Reaktionsgeschwindigkeit einer chemischen Reaktion. Es wird daher darauf geachtet, dass eine möglichst hohe Temperatur erreicht wird.The system is heated in the circulation circuit, m the reaction rate and the efficiency of the acid solution too increase. Doubled with the increase in temperature by 10 ° C the reaction rate of a chemical reaction. It is therefore ensured that the highest possible temperature is reached.

    Über einen im by-pass installierten Wärmeaustauscher (nicht gezeigt) wird das System auf 50 - 80°C erhitzt. Als Wärmequelle dient entweder vom Betreiber bereitgestellter Hilfsdampf oder ein eigener ölgefeuerter Warmwasserkessel.About a by-pass installed heat exchanger (not shown), the system is heated to 50-80 ° C. As a heat source Serves either by the operator provided auxiliary steam or a separate oil-fired hot water boiler.

    Der Wärmeaustauscher ist so ausgelegt, dass eine Temperatur von ca. 50 - 80°C innerhalb von 6 - 10 Stunden erreicht werden kann.The heat exchanger is designed so that a temperature be reached from about 50 - 80 ° C within 6 - 10 hours can.

    Es ist zu beachten, dass alle Öffnungen der Kesselanlage 1, einschließlich der Rauchgasklappe (nicht gezeigt), geschlossen sind. Werden diese Öffnungen nicht vollständig geschlossen, entsteht durch die Anwärmung der Kessel- und Rohrleitungsflächen eine Kaminwirkung, die einen Durchzug entstehen lässt. Dieser Durchzug würde die erwärmten Rohrleitungen schnell wieder auskühlen, so dass die spezifizierte Temperatur mit einem Hilfskessel nicht erreicht werden kann.It should be noted that all the openings of the boiler system 1, including the flue gas flap (not shown), closed are. If these openings are not completely closed, is created by the heating of the boiler and piping surfaces a fireplace effect that creates a draft. This draft would quickly return the heated piping cool down so that the specified temperature with a Auxiliary boiler can not be reached.

    Während das Hauptsystem erhitzt wird, werden nacheinander auch die Nebensysteme durchströmt, um diese ebenfalls zu erhitzen.While the main system is being heated, so will one after another flows through the auxiliary systems in order to heat them as well.

    Stufe d:Stage d:

    Die Beheizung der Systeme ist zu beenden, sobald eine Temperatur von 50 - 80°C am Rücklauf 10 festgestellt wird. Der Zirkulationskreislauf wird weiterhin aufrecht erhalten.The heating of the systems must be stopped as soon as a temperature from 50 - 80 ° C at the return 10 is detected. The circulation circuit will continue to be maintained.

    Stufe e: Dosierung inhibierter Flusssäure Stage e: Dosage of inhibited hydrofluoric acid

    Die Reinigungslösung besteht mit Rodine aus inhibierter 1%iger Flusssäure. Die Flusssäure und der Inhibitor Rodine werden über den Mischbehälter der Umwälzpumpe 1 im Zirkulationsverfahren direkt in die Netzmittellösung hineindosiert, wobei darauf zu achten ist, dass das Netzmittel und die inhibierte Flusssäure sich nicht gegenseitig negativ beeinflussen.The cleaning solution consists of Rodine inhibited 1% Hydrofluoric acid. The hydrofluoric acid and the inhibitor Rodine are over the mixing container of the circulation pump 1 in the circulation process dosed directly into the wetting agent solution, with it It should be noted that the wetting agent and the inhibited hydrofluoric acid do not affect each other negatively.

    Die Strömungsgeschwindigkeit der Reinigungslösung in den zu behandelnden Rohrleitungen beträgt in der Regel 0,2 m/s.The flow rate of the cleaning solution in the too treated piping is usually 0.2 m / s.

    Stufe f:Stage f:

    Während der Kreislauf weiterhin aufrecht erhalten wird, und die einzelnen Teilsysteme durchströmt werden, werden sowohl die Eisenkonzentration als auch die Konzentration der Flusssäure in regelmäßigen Abständen und herkömmlicher Weise bestimmt. While the circulation continues to be sustained, and the individual subsystems are traversed, both the iron concentration as well as the concentration of hydrofluoric acid determined at regular intervals and conventionally.

    Die Konzentration an gelöstem Eisen darf die maximale Eisenkonzentration nicht überschreiten. Die Überwachungswerte sind weiter unten angegeben.The concentration of dissolved iron must be the maximum iron concentration do not exceed. The monitoring values are given below.

    Die Reinigung ist beendet, wenn die Eisenkonzentration bei freier Säure konstant ist. Mit dem Erreichen der konstanten Werte wird der Zirkulationskreislauf gestoppt. Alle Ventile (Zulauf 20 und Rücklauf 11) werden geschlossen. Ja nach Anlagentyp kann die Säure jetzt bis zu 12 h im System verbleiben (Standphase), um die Reinigungsleistung zu erhöhen.The cleaning is finished when the iron concentration at free acid is constant. With the achievement of constant Values, the circulation circulation is stopped. All valves (Inlet 20 and return 11) are closed. Yes according to plant type The acid can now remain in the system for up to 12 hours (Stance phase) to increase the cleaning performance.

    Stufe g: Verdrängen der Säure und Spülen auf Leitfähigkeit Stage g: displacing the acid and purging for conductivity

    Die Säure wird im Durchstoßverfahren mit Deionat aus dem System verdrängt. Nach dem Entlüften des Systems müssen alle Abschnitte und Teilabschnitte auf Leitfähigkeit geprüft werden. Dieses wird im Hochgeschwindigkeitsverfahren mit Hilfs-Pumpen durchgeführt.The acid is purged with deionized from the system repressed. After bleeding the system, all sections must and sections are checked for conductivity. This is using high-speed process with auxiliary pumps carried out.

    Die Überwachungswerte sind weiter unten angegeben. Sobald die Werte an den Entwässerungen / Entleerungen des Systems feststellbar sind, ist da Hochgeschwindigkeitsspülen beendet.The monitoring values are given below. As soon as the Values at the drains / drains of the system detectable are there, high-speed rinsing is over.

    Für das Verdrängen der Säure und das anschließende Hochgeschwindigkeitsspülen werden etwa min. drei bis max. vier Anlagenvolumina Deionat benötigt.For displacing the acid and then high speed rinsing be about min. three to max. four plant volumes Deionat needed.

    Stufe h: Alkalisierung und Passivierung Stage h: alkalization and passivation

    Das gesamte System ist nach dem Spülen auf Leitfähigkeit mit Deionat gefüllt. Der Zirkulationskreislauf wird wieder aufgenommen.The entire system is after flushing with conductivity Deionat filled. The circulation circuit is resumed.

    Um die gebeizte Metalloberfläche zu neutralisieren, wird Ammoniakwasser in das System dosiert. Durch das Ammoniak wird der pH-Wert auf > 10,2 angehoben. Zeitgleich wird Wasserstoffperoxyd in den Kreislauf dosiert. Dieses Oxidationsmittel bewirkt die Ausbildung einer Passivschicht auf der gebeizten, neutralisierten Metalloberfläche. Die Passivierung ist abgeschlossen, wenn ein positives Redox-Potential gemessen wird. Die Überwachungswerte sind weiter unten aufgeführt.To neutralize the stained metal surface, ammonia water becomes metered into the system. By the ammonia is the pH raised to> 10.2. At the same time, hydrogen peroxide becomes dosed into the circulation. This oxidizing agent causes the formation of a passive layer on the stained, neutralized Metal surface. Passivation is completed when a positive redox potential is measured. The monitoring values are listed below.

    Stufe i: SystementleerungStage i: System emptying

    Nach der Alkalisierung und Passivierung müssen alle anlageneigenen am System angeschlossenen Mess- und Dosierleitungen gespült werden.After alkalization and passivation, all plant-owned Rinsed the measuring and metering lines connected to the system become.

    Wenn möglich, wird die Passivierungslösung aus dem System und den Teilabschnitten statisch, durch geodätische Höhe, entleert. Gegebenenfalls werden die Hilfs-Pumpen zur Entleerung des Systems eingesetzt.If possible, the passivation solution is removed from the system and the sections statically, by geodetic height, emptied. If necessary, the auxiliary pumps for emptying used by the system.

    In der nachfolgenden Tabelle werden die erfindungsgemäßen Überwachungswerte während des Reinigungsverfahrens angegeben: Stufe Erforderliche Analysen/ mit: b: Hochgeschwindigkeitsspülen bis Trübung =< 0,5
    (photometrisch 435 mm, 50 mm Küvette)         e: Beizung mit Flusssäure alle 30 Minuten Leitfähigkeit (Handmessgerät)
    Säurekonzentration (Titration) gelöstes Eisen in der Lösung (photometrisch m. 500 nm, 10 mm)         f: Spülen auf Leitfähigkeit Leitfähigkeit < 20 µS/cm über dem Eingangswert h: Passivierung alle 30 Minuten pH-Wert ≥ 10,2
    Redox-Potential >+10 mV (positiv) (Handmessgerät m. pH-/Redoxelektrode)         The following table shows the monitoring values according to the invention during the purification process: step Required analyzes / with: b: high speed rinsing to turbidity = <0.5
    (photometric 435 mm, 50 mm cuvette)     e: Treatment with hydrofluoric acid every 30 minutes Conductivity (handheld device)
    Acid concentration (titration) Dissolved iron in the solution (photometrically at 500 nm, 10 mm)     f: Rinse for conductivity Conductivity <20 μS / cm above the input value h: Passivation every 30 minutes pH ≥ 10.2
    Redox potential> +10 mV (positive) (handheld instrument with pH / redox electrode)

    Bei den erf. Verfahren der Reinigung des Wasser-Dampf-Kreislaufs fällt Abwasser an. Dieses Abwasser wird aufgefangen und nach einer Behandlung bei Bedarf wieder in den Wasserkreislauf des Kraftwerks zurückgegeben. Der ausgefällte Dünnschlamm wird mit einer Kammerfilterpresse entwässert und deponiert.In the erf. Method of cleaning the water-steam cycle wastewater accumulates. This wastewater is collected and after treatment, if needed, back into the water cycle returned to the power plant. The precipitated thin sludge is drained with a chamber filter press and dumped.

    Das gesamte Vorspülwassser, die Beizlösung und das Spülwasser werden in einem Abwasserbecken gesammelt. Durch das Wasser sparende Konzept wird nun das ca. 3,5 - 6-fache Anlagevolumina an Deinonat verwendet. Damit das gesamte Abwasser aufgefangen werden kann, ist das Abwasserbecken entsprechend auszulegen. Das Abwasserbecken dient als Zwischenlagerung.All pre-rinse water, pickling solution and rinse water are collected in a wastewater basin. Through the water saving concept is now about 3.5 - 6 times the investment volume used on deionate. So that the entire wastewater collected the wastewater tank is to be designed accordingly. The wastewater basin serves as intermediate storage.

    Die Flüsssäurekonzentration im Abwasser liegt in dem Bereich zwischen 0,01 % bis 0,2 %. Zusätzlich befinden sich im Abwasser der eingesetzte Inhibitor und gelöste Eisenionen (Fe++).The liquid acid concentration in the waste water is in the range between 0.01% to 0.2%. In addition, the wastewater contains the inhibitor used and dissolved iron ions (Fe ++ ).

    Die Beizlösung wird während des Verdrängens online mit Kalkhydrat vorneutralisiert. Im Anschluss an die Beizung wird das Abwasser im Abwasserbecken entsprechend durch weitre Zugabe von Kalkhydrat neutralisiert.The pickling solution becomes online during the suppression with hydrated lime pre-neutralized. Following the pickling, the Waste water in the wastewater tank according to weitre addition neutralized by hydrated lime.

    Um den Neutralisationsvorgang und die Oxidation der Fe++-Ionen zu beschleunigen, wird Pressluft aus kleinen Schlauchöffnungen in das Abwasser eingedüst.In order to accelerate the neutralization process and the oxidation of the Fe ++ ions, compressed air from small tube openings is injected into the wastewater.

    Die organischen Bestandteile des Abwassers werden durch Adsorption an Aktivkohle abgetrennt, indem pulverförmige Aktivkohle dem Abwasser zugegeben wird.The organic components of the wastewater are adsorbed separated on activated charcoal by adding powdered activated carbon is added to the wastewater.

    Die Flusssäure reagiert mit dem Kalkhydrat zu Flussspat (CaF2) und Wasser. Der wasserunlösliche Flussspat, das ausgefällte Eisenhydroxid Fe(OH)3 und die Aktivkohle setzen sich ab. The hydrofluoric acid reacts with the hydrated lime to form fluorspar (CaF 2 ) and water. The water-insoluble fluorspar, the precipitated iron hydroxide Fe (OH) 3 and the activated carbon settle out.

    Nachdem sich die Klarphase vom Schlamm getrennt hat, wird der geklärte und pH-neutrale Überstand abgepumpt.After the clear phase has separated from the mud, the clarified and pumped neutral pH supernatant.

    Das Abwasser aus der Alkalisierung und Passivierung enthält Ammoniak und Wasserstoffperoxid. Dieses Abwasser wird in einem zusätzlichen Abwassertank aufgefangen, da es nicht mit dem fluoridhaltigen Abwasser aus der Beizung gemischt werden kann.The waste water from the alkalization and passivation contains Ammonia and hydrogen peroxide. This wastewater is in one additional wastewater tank, since it does not match the Fluid wastewater from the dressing can be mixed.

    Die Abwasserabgabe erfolgt über eine Wasseraufbereitungsanlage im Kationen/Anionenaustausch mit vorgeschaltetem AktivkohleFilter. Dadurch wird erreicht, dass sowohl die gelösten Ionen zurückgehalten, als auch der CSB-Gehalt des Wassers reduziert wird.The wastewater is discharged via a water treatment plant in cation / anion exchange with upstream activated carbon filter. This ensures that both the dissolved ions retained, as well as the COD content of the water reduced becomes.

    Folgende Grenzwerte werden eingehalten:The following limits are met:

    pH-WertPH value 6, 5 - 9,06, 5 - 9,0 absetzbare Stoffedeductible substances max. 5 ml/lMax. 5 ml / l ungelöste Stoffeundissolved substances max. 20 mg/lMax. 20 mg / l CSB-WertCOD max. 100 mg O2/lMax. 100 mg O 2 / l Eisen (Fe)Iron (Fe) max. 5 mg/lMax. 5 mg / l Ammonium (NH4 +)Ammonium (NH 4 + ) max. 2 mg/lMax. 2 mg / l Fluorid (F-)Fluoride (F - ) max. 5 mg/lMax. 5 mg / l Färbungcoloring klar, farblosclear, colorless

    Das Abwasser hat eine Temperatur von max. 35°C.The wastewater has a temperature of max. 35 ° C.

    Das so aufbereitete Abwasser kann problemlos über das Service- oder Rohwasser in den Wasserkreislauf der Anlage zurückgegeben werden.The treated wastewater can be easily processed via the service or raw water returned to the water cycle of the plant become.

    Die ausgefällten Kalziumfluoridsalze und das Eisenoxid bildet zusammen mit der Aktivkohle ein Dünnschlammgemisch. Dieser Dünnschlamm enthält auch die aus der Anlage heraus gespülten Feststoffe.The precipitated calcium fluoride salts and the iron oxide forms together with the activated carbon a thin sludge mixture. This Thin sludge also contains the purged out of the plant Solids.

    Der Dünnschlamm wird über eine Kammerfilterpresse abgepresst. The thin sludge is pressed off via a chamber filter press.

    Der entstandene Filterkuchen (Wassergehalt 45 - 55%) wird in abgedeckten Containern bis zur Entsorgung auf einer geeigneten Deponie zwischengelagert. Ein zugelassenes lokales Entsorgungsunternehmen wird mit der fachgerechten Entsorgung beauftrag. Gegebenenfalls wird der Filterkuchen laborchemisch untersucht.The resulting filter cake (water content 45-55%) is in Covered containers until disposal on a suitable Landfill temporarily stored. An approved local waste disposal company is assigned with the professional disposal. If necessary, the filter cake is examined by laboratory chemistry.

    Das Permeat wird in die Kanalisation abgegeben. Während der Abgabe werden die Abwasserwerte überwacht.The permeate is discharged into the sewer. During the Delivery, the wastewater values are monitored.

    Folgende Grenzwerte zum Abpumpen in die öffentliche Kanalisation oder in die vorhandene Aufbereitungsanlage werden eingehalten: pH-Wert 6,5 - 9,0 absetzbare Stoffe max. 50 ml/l ungelöste Stoffe max. 100 mg/l CSB-Wert max. 2.000 mg O2/l Eisen (Fe) max. 10 mg/l Ammonium (NH4 +/NH3) max. 20 mg/l Fluorid (F-) max. 50 mg/l Färbung klar, farblos The following limit values for pumping out into the public sewage system or into the existing treatment plant are complied with: PH value 6.5 - 9.0 deductible substances Max. 50 ml / l undissolved substances Max. 100 mg / l COD Max. 2,000 mg O 2 / l Iron (Fe) Max. 10 mg / l Ammonium (NH 4 + / NH 3 ) Max. 20 mg / l Fluoride (F - ) Max. 50 mg / l coloring clear, colorless

    Das erfindungsgemäße Verfahren gewährleistet, dass die behandelten Oberflächen frei von Rost, Zunder und nachgebildetem Magnetit sind.The inventive method ensures that the treated Surfaces free of rust, scale and imitation Magnetite are.

    Der während der Behandlung maximale Gesamtabtrag an Eisen wird 20 g/m2 nicht übersteigen, gilt auch für Chromstähle.The maximum total removal of iron during treatment will not exceed 20 g / m 2 , which also applies to chromium steels.

    Maximaler Leitfähigkeitszuwachs nach einem Kationenfilter, gemessen in der Frischdampfleitung nach 10 h durchgehenden Vollastbetrieb = 0,3 µS/cm. Maximaler Eisenanstieg, gemessen in der Frischdampfleitungen nach 10 h durchgehenden Vollastbetrieb = 20 µS/l, nach 50 h durchgehenden Schwachlastbetrieb = 20 µS/1.Maximum increase in conductivity after a cation filter, measured in the main steam line after 10 h continuous full load operation = 0.3 μS / cm. Maximum iron increase, measured in the main steam lines after 10 h continuous full load operation = 20 μS / l, after 50 h continuous low load operation 20 μS / 1.

    Claims (6)

    1. Method for the chemical cleaning of a gas and steam plant or power station containing preheaters, evaporators, superheaters, pumps, pipes, valves, flaps, tanks and/or boilers and the like, with the following steps, which are precisely matched to one another together with their parameters and materials and consume a maximum of six plant volumes of deionate:
      a. filling the plant with deionate, venting and pressure ejecting of the pipes for checking tightness and if necessary eliminating leaks,
      b. prerinsing with a maximum of two plant volumes of deionate for removing coarse impurities in the open circuit process at a rate of > 0.5 m/s until the turbidity at the outlet (8) drops below < 0.5 (photometrically 435 nm, 50 mm cell),
      c. dosing in a wetting agent solution (degreasing) at pumping station (2) into the mixing tank in recycling operation for eliminating oil and grease residues until a concentration of 0.05 to 0.1 vol.% is reached and allowing to act for at least 2 h during heating to a temperature of 50 to 80°C,
      d. ending heating when a temperature of 50 to 80°C is set at return (10),
      e. dosing in a scouring/cleaning solution, compatible with the wetting agent solution, in the form of an approximately 0.8 to 1.5 vol.% inhibited hydrofluoric acid via the pumping station mixing tank in the recycling process at a flow rate of > 0.2 m/s into the pipes to be treated,
      f. multiple determination of the Fe concentration in the case of adequate free hydrofluoric acid until the values are constant,
      g. displacing the hydrofluoric acid through the addition of a maximum of four plant volumes of deionate, venting the plant, conductivity testing in the high speed process until it is < 10 or 20 µs/cm above the initial value,
      h. resumption of the circulation cycle and raising the pH value to > 10.0 (alkalizing), dosing in H2O2 for forming a passive layer on the inner metallic faces of the pipes until a positive redox potential > +10mV is measured,
      i. rinsing all the pipes and emptying the solutions present.
    2. Method according to claim 1, characterized in that the prerinsing of steps a and b is performed with max. 0.5 to 1 plant volume of deionate and for the following steps c-f no additional deionate plant volumes are used and where in step g 3 to 3.5 deionate plant volume are used.
    3. Method according to claims 1 and 2, characterized in that > 100 nm surface particles are removed during the wetting agent solution circulation y means of a bypass-installed filter (4).
    4. Method according to one or more of the claims 1 to 3, characterized in that approximately 1 vol.% inhibited hydrofluoric acid is dosed in to the scouring/cleaning solution in step e.
    5. Method according to one or more of the claims 1 to 4, characterized in that in step f the circulation is stopped and there is a passage into a holding phase lasting up to 12 h.
    6. Method according to one or more of the claims 1 to 5, characterized in that min. 90% of the waste water is returned to the power station water cycle following treatment in a waste water treatment plant.
    EP04011890A 2004-05-19 2004-05-19 Method of chemical cleaning of a gas and vapor installation Expired - Lifetime EP1598629B1 (en)

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    EP04011890A EP1598629B1 (en) 2004-05-19 2004-05-19 Method of chemical cleaning of a gas and vapor installation
    AT04011890T ATE313056T1 (en) 2004-05-19 2004-05-19 METHOD FOR CHEMICAL CLEANING A GAS AND STEAM SYSTEM
    ES04011890T ES2255694T3 (en) 2004-05-19 2004-05-19 CHEMICAL CLEANING PROCEDURE OF A GAS AND STEAM INSTALLATION.
    DE502004000183T DE502004000183D1 (en) 2004-05-19 2004-05-19 Process for the chemical cleaning of a gas and steam plant

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    EP1598629B1 true EP1598629B1 (en) 2005-12-14

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    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102269400A (en) * 2011-07-26 2011-12-07 西安热工研究院有限公司 Feeding device for hydrogen peroxide in chemical cleaning of power plant boiler

    Families Citing this family (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102537930B (en) * 2010-12-17 2015-04-01 冯伟忠 Cleaning method for concurrent boiler
    CN102944137A (en) * 2012-11-09 2013-02-27 青海电力科学试验研究院 Pipeline device for chemically cleaning boiler
    CN103063082B (en) * 2012-12-31 2014-07-16 江苏肯创环境科技股份有限公司 Cleaning and anti-scaling process without shut-down of gas-gas heater (GGH) and device thereof
    CN103090700B (en) * 2013-03-04 2015-04-01 杨铭 Baffle high-efficient heat exchanger
    CN114951159B (en) * 2022-06-02 2023-07-07 中天钢铁集团(南通)有限公司 Metallurgical oxygen production pipeline thermal state cleaning method

    Family Cites Families (3)

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    Publication number Priority date Publication date Assignee Title
    AT281541B (en) * 1966-08-02 1970-05-25 Beratherm Ag Process for pickling metallic inner surfaces of closed vessels
    DE3533886A1 (en) * 1985-04-16 1987-03-26 Kraftwerk Union Ag CLEANING PROCEDURE
    DE19843442C1 (en) * 1998-09-22 2000-03-02 Siemens Ag Steam boiler unit components cleaning arrangement e.g. for power station equipment

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102269400A (en) * 2011-07-26 2011-12-07 西安热工研究院有限公司 Feeding device for hydrogen peroxide in chemical cleaning of power plant boiler
    CN102269400B (en) * 2011-07-26 2013-04-10 西安热工研究院有限公司 Feeding device for hydrogen peroxide in chemical cleaning of power plant boiler

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