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WO2017055002A1 - Procédé de nettoyage de turbines à vapeur au moyen de vapeur humide activée - Google Patents

Procédé de nettoyage de turbines à vapeur au moyen de vapeur humide activée Download PDF

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Publication number
WO2017055002A1
WO2017055002A1 PCT/EP2016/070538 EP2016070538W WO2017055002A1 WO 2017055002 A1 WO2017055002 A1 WO 2017055002A1 EP 2016070538 W EP2016070538 W EP 2016070538W WO 2017055002 A1 WO2017055002 A1 WO 2017055002A1
Authority
WO
WIPO (PCT)
Prior art keywords
steam
plasma
turbine
wet steam
cleaning
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.)
Ceased
Application number
PCT/EP2016/070538
Other languages
German (de)
English (en)
Inventor
Florian Eder
Christian Buske
Walter Gehringer
Detlef Haje
Marek Maleika
Felix Ntourmas
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.)
Plasmatreat GmbH
Siemens AG
Siemens Corp
Original Assignee
Plasmatreat GmbH
Siemens AG
Siemens Corp
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 Plasmatreat GmbH, Siemens AG, Siemens Corp filed Critical Plasmatreat GmbH
Publication of WO2017055002A1 publication Critical patent/WO2017055002A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/002—Cleaning of turbomachines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • 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 or arrangements for removing water, minerals or sludge from boilers ; Arrangement of cleaning apparatus in boilers; Combinations thereof with boilers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B2230/00—Other cleaning aspects applicable to all B08B range
    • B08B2230/01—Cleaning with steam

Definitions

  • the present invention relates to a wet steam process for steam turbines and a steam turbine with wet steam device. It is known that turbines in steam power plants are subject to the problem of salinization of their blading. In operation, a mixture of partially sparingly soluble salts is deposited on the blade surfaces, in particular the guide blade surfaces .
  • the salts are mostly sodium, aluminum or silicon salts to their oxides,
  • Chlorides, sulfates, carbonates, hydroxides and phosphates can easily adversely affect only the steam flow behavior, is already thicker coverings affect the performance of the turbine. In the advanced operation of the turbine, such thick layers of salt can form on the blade surfaces that they reduce the flow cross-section of the turbine. A power loss of up to 4% can then be observed.
  • the cause of the salinity of a turbine must be assessed on an individual basis, but usually depends on the use of a Kesselwas ⁇ sers from that does not meet the standard, or is in the wrong dosage of anti-corrosion additives in the boiler water.
  • the steam flow of the corrosion protection additives used can also have a negative effect on the salinisation behavior.
  • the operating parameters of the turbine may favor salinization of the blading.
  • Turbine housing open and the turbine even partially de ⁇ mounted to reach the affected areas can and thus effectively mechanically clean to be able to.
  • Such a cleaning operation means a longer downtime of the turbine, at the same cost high service ⁇ and correspondingly financial losses for the Be ⁇ driver.
  • a (partial) disassembly of the turbine is error-prone.
  • An alternative cleaning process is condenser cleaning, in which the turbine also has to be shut down in order to be able to flood it with boiling water. This cleaning process is also adversely affected by a longer downtime, except ⁇ this measure is only suffi ⁇ cient for thin deposits.
  • online washing a wet steam cleaning for turbines is known in which a turbine dismantling, at least ⁇ in less advanced cases of salinisation, can be avoided. In this case, wet steam is flowed into the turbine, which removes at least the water-soluble components of the salt encrustation. The success of wet steam cleaning depends so much on the different composition of the salt deposits.
  • wet steam cleaning can, for example, be carried out with the turbine running down, which runs without load, ie in which no electricity is generated, but which is still rotating. The turbine is then already slightly cooled. This process of wet steam cleaning in turn has the disadvantage of downtime during which no electricity is generated, it is also less effective and poorly soluble components can still be removed only in a mechanical cleaning step.
  • Insbesonde ⁇ re to propose a cleaning process that actually, that can be performed during operation of the turbine online to be proposed solution, and downtime vermei ⁇ det. It is a further object of the invention to provide an improved device thereto.
  • the inventive method for cleaning a steam turbine comprises an activation step in which a cleaning liquid is flown with a plasma, the plasma-activated cleaning liquid is evapo ⁇ rationed to active wet steam, and then with the active wet steam to be cleaned Object like the interior of a steam turbine or their blading is streamed.
  • a Vor ⁇ part of this plasma process is that so far the much less effective wet steam cleaning process can be replaced while continuing to avoid the use of chemicals, especially of aggressive substances.
  • This process for cleaning a steam turbine can therefore be referred to as an active wet steam process.
  • a plasma Under a plasma is understood to mean a mixture of particles on a molecular level atomar- whose components are at least partially electrically charged particles, ions and so Elect ⁇ Ronen. This means that a plasma contains free charge carriers. This active wet steam process is preferred to a
  • a steam turbine is in the Re ⁇ gel of a rapidly rotating shaft, which is equipped with many turbine blades. This rotating shaft is impinged by water vapor and driven.
  • the active wet steam process is of particular advantage for the purification of
  • Blading ie the entirety of the blades of a turbine.
  • a previously neutral or mild cleaning liquid such as water can be enriched intrinsically with dissolving ingredients. Thus, no chemicals are introduced into the turbine cycle.
  • Silicon salts can be converted into a soluble form by the active wet steam and thus be removed from the turbine circuit .
  • the sparingly soluble salt deposits on the turbine blades are mostly oxides, chlorides, sulfates, hydroxides, carbonates and phosphates.
  • Particularly preferred is the embodiment of the invention in which water is used as the cleaning liquid.
  • ⁇ sondere in the active-wet steam method as cleaning liquid the boiler water of the steam turbine used ⁇ the.
  • deionized water so-called demineralized water or deionized water, which does not contain the minerals found in normal spring or tap water and is therefore frequently used as a fuel, especially in technical applications.
  • the boiler water of the steam turbine is the working medium in the steam generator ⁇ , the steam flows onto the turbine. In general, this also contains a proportion of Korrosionsschutzadditi ⁇ ven. Using this boiler water as a cleaning agent has the advantage of operating only one cycle and of being able to integrate the active wet steam process directly into the operation of a steam turbine.
  • An advantage of the embodiment of the invention in which the active wet steam process comprises an activation step in which the cleaning liquid is flowed through an atmospheric pressure plasma and activated.
  • atmospheric pressure plasma a plasma is referred to, which exists in a rich ⁇ Druckbe to the so-called normal pressure, i.e. at atmospheric pressure.
  • a decisive technical advantage of the atmospheric pressure plasma is that no special or designed for high pressure differences reaction vessel , as et wa for low-pressure plasmas or high-pressure plasmas, is necessary.
  • only low current densities are needed to produce an atmospheric pressure plasma.
  • the excitation of the plasma is usually done by a Konstromanre ⁇ tion by low-frequency alternating currents, for example in the radio wave or in the microwave range.
  • the advantage therefore lies in the very good technical feasibility of the atmospheric ⁇ pressure plasma. This is generated for example in a plasma nozzle.
  • an air plasma is generated in the activation step of the active wet steam method. Under air plasma is ionized air.
  • the plasma generation ⁇ device is supplied for this with air as the process gas.
  • Air is the gas mixture of the earth's atmosphere, wel ⁇ ches two main components namely nitrogen, with around 78 vol .-%, and oxygen, with around 21 vol .-%, has.
  • Dane ⁇ ben an air mixture on other components such as argon, carbon dioxide and traces of other gases.
  • the advantage to use an air plasma is example ⁇ as the fact is that air as the process gas very easily and cost-effectively available.
  • an oxygen plasma can be used to activate the cleaning liquid, in which oxygen is introduced as process gas into the plasma apparatus.
  • oxygen is introduced as process gas into the plasma apparatus.
  • H2O2 hydrogen peroxide
  • the cleaning liquid can be adjusted to the solving of the coverings to rei ⁇ nigenden article about the choice of the process gas for the plasma activation of the cleaning fluid as well as its concentration. For even a too low pH value may in turn be disadvantageous if thereby the active wet steam would become too aggressive.
  • the active wet steam can be mixed with other water or vapor streams in order to achieve an adjustment of the pH.
  • the activated water can be brought to a higher pressure level, for example by means of a pump.
  • the pump can be a power plant ⁇ usual pump, such as a condensate or Lucaswasserpum ⁇ pe be used.
  • a pump already existing or old natively use a separate pump.
  • the evaporation can be done by a steam generator of a power plant or a separate steam generator.
  • the duration of the activation step is so- ⁇ selects that a pH of the cleaning liquid below 6, in particular below 5 is obtained.
  • the desired pH of the cleaning fluid may also be less than 4, in particular less than 3.
  • An advantage of the acidic active wet steam is to be able to transfer ⁇ with in a soluble form of the sparingly soluble salt deposits there.
  • the Entsal ⁇ is preferably carried wetting step after the condensation of the wet steam-activated.
  • the working medium of a steam turbine that is to say in particular the so-called boiler water, is thereby circulated for example via a condenser. This happens, for example, in a condensation turbine.
  • the condensate can then be returned to the turbine circuit after desalination.
  • the steam turbine according to the invention comprises an active wet steam device, which comprises a plasma generating device, which is arranged so that a cleaning liquid ⁇ is wetted with the plasma, also includes an evaporator, which is arranged so that the plasma-activated cleaning liquid to active wet steam is evapo ⁇ gurable and it is a means for flow to the steam turbine comprises that directs the active wet steam in the in ⁇ nenraum the steam turbine and the blades.
  • an active wet steam device which comprises a plasma generating device, which is arranged so that a cleaning liquid ⁇ is wetted with the plasma
  • an evaporator which is arranged so that the plasma-activated cleaning liquid to active wet steam is evapo ⁇ gurable and it is a means for flow to the steam turbine comprises that directs the active wet steam in the in ⁇ nenraum the steam turbine and the blades.
  • Such a steam turbine has to hold up permanently with an inter ⁇ NEN cleaning device and its versalzung
  • the steam turbine can be equipped with a monitoring unit, which controls, for example, the duration of the activation step and the activation parameters, the process gas, its concentration and the duration of flow of the turbine, including the actual cleaning step.
  • FIG. 1 shows a reservoir with an aqueous washing solution 10, which is in particular the washing water from the boiler or hotwell of the condenser.
  • the described activation pretreatment of the wash water 10 with the plasma 12 is carried out to generate the plasma 12 is preferably a plasma nozzle 20, also called plasma jet used.
  • the plasma nozzle 20 has for this purpose at least ei ⁇ NEN inlet for a process gas 11, which may in particular be air.
  • this process gas 11 is flowed through a concentric annular inlet into the main chamber of the plasma nozzle, in which the plasma 12 is generated.
  • This central cavity of the plasma nozzle 20 is surrounded by a ring electrode 24 which is isolated from the gas inlets 21 via a dielectric ring 22. Also isolated from the outer ring electrode 24 is the centrally mounted pin electrode 23 which acts as a counter electrode.
  • Electrodes 23, 24 are closed to an AC voltage source 25, which applies an AC voltage in the kV range to the two electrodes 23, 24.
  • the process gas 11 is excited to a plasma 12 in the cavity of the plasma nozzle 20. This emerges from the nozzle head 26 and is introduced directly into the boiler ⁇ water 10 about.
  • the plasma nozzle 20 is connected to the plasma discharge from the nozzle head 26 with a hollow body 30 made of a Sinterma ⁇ TERIAL.
  • the hollow body 30 has at least one partial section of a sintered material. Through the pores of the sintered material, the plasma 12 passes in fine bubbles 31 into the liquid 10. Due to the increased surface, a better solution of the active plasma species in the liquid 10 is ensured.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Thermal Sciences (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

L'invention concerne une turbine à vapeur et un procédé de nettoyage de turbines à vapeur. Ce procédé consiste, au cours d'une étape d'activation, à faire circuler un plasma dans un liquide de nettoyage aqueux, puis à procéder à une évaporation. La vapeur humide activée par plasma permet de supprimer efficacement même les dépôts de sel difficilement solubles se trouvant sur les aubes de turbine. Ce procédé peut être mis en œuvre pendant le fonctionnement de la turbine à vapeur. Cette invention concerne également un dispositif de génération de vapeur humide activée qui peut être installé sur une turbine à vapeur au moment de sa fabrication ou par exemple être installé ultérieurement sur des centrales thermiques à vapeur existantes.
PCT/EP2016/070538 2015-09-30 2016-08-31 Procédé de nettoyage de turbines à vapeur au moyen de vapeur humide activée Ceased WO2017055002A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015218930.9A DE102015218930A1 (de) 2015-09-30 2015-09-30 Aktiv-Nassdampf-Verfahren für Dampfturbinen und Dampfturbine mit Aktiv-Nassdampf-Vorrichtung
DE102015218930.9 2015-09-30

Publications (1)

Publication Number Publication Date
WO2017055002A1 true WO2017055002A1 (fr) 2017-04-06

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Family Applications (1)

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PCT/EP2016/070538 Ceased WO2017055002A1 (fr) 2015-09-30 2016-08-31 Procédé de nettoyage de turbines à vapeur au moyen de vapeur humide activée

Country Status (2)

Country Link
DE (1) DE102015218930A1 (fr)
WO (1) WO2017055002A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190076537A1 (en) * 2016-03-18 2019-03-14 The George Washington University Compositions for treatment of cancer, methods and systems for forming the same
CN112031881A (zh) * 2020-08-06 2020-12-04 中天合创能源有限责任公司化工分公司 一种汽轮机在线除垢的方法
CN114278398A (zh) * 2021-12-09 2022-04-05 青岛华捷汽轮机有限公司 汽轮机防尘防腐蚀在线维保系统及其维保方法
CN115186400A (zh) * 2022-06-15 2022-10-14 中国船舶重工集团公司第七0三研究所 一种轴流压气机叶片失速与堵塞裕量的预设计方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH171130A (de) * 1933-07-21 1934-08-15 Sulzer Ag Verfahren zur Ausscheidung von Salzen in Röhrendampferzeugern.
JPS5621333A (en) * 1979-07-31 1981-02-27 Fujitsu Ltd Cleaning method of equipment for manufacturing semiconductor element
DE4414263A1 (de) * 1994-04-23 1995-10-26 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur plasmachemischen Reinigung von Substraten
EP0708295A1 (fr) * 1994-10-21 1996-04-24 Energy Support Corporation Appareil pour former des films de protection dans des conduites d'alimentation d'eau pour chaudière
WO2007063987A1 (fr) * 2005-12-02 2007-06-07 Osaka University Procede de traitement/lavage avec des mousses de plasma dans de l’eau ultra-pure et appareil correspondant
DE202008011646U1 (de) * 2008-09-02 2010-01-28 BECKMANN-INSTITUT für Technologieentwicklung e.V. Einrichtung zum Plasmapolieren unter Verwendung eines flüssigen Elektrolyten
WO2011138463A1 (fr) * 2010-05-07 2011-11-10 Inp Greifswald - Leibniz-Institut Für Plasmaforschung Und Technologie E. V. Procédé de stérilisation par un gaz généré par un plasma
DE102011003781B3 (de) * 2011-02-08 2012-05-24 Meiko Maschinenbau Gmbh & Co. Kg Verfahren und Vorrichtung zur Speiseresteentsorgung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2931958T3 (pl) 2012-12-11 2020-07-13 Plasmatreat Gmbh Urządzenie czyszczące i sposób czyszczenia przedmiotów wodą
US20150159122A1 (en) 2013-12-09 2015-06-11 General Electric Company Cleaning solution and methods of cleaning a turbine engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH171130A (de) * 1933-07-21 1934-08-15 Sulzer Ag Verfahren zur Ausscheidung von Salzen in Röhrendampferzeugern.
JPS5621333A (en) * 1979-07-31 1981-02-27 Fujitsu Ltd Cleaning method of equipment for manufacturing semiconductor element
DE4414263A1 (de) * 1994-04-23 1995-10-26 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur plasmachemischen Reinigung von Substraten
EP0708295A1 (fr) * 1994-10-21 1996-04-24 Energy Support Corporation Appareil pour former des films de protection dans des conduites d'alimentation d'eau pour chaudière
WO2007063987A1 (fr) * 2005-12-02 2007-06-07 Osaka University Procede de traitement/lavage avec des mousses de plasma dans de l’eau ultra-pure et appareil correspondant
DE202008011646U1 (de) * 2008-09-02 2010-01-28 BECKMANN-INSTITUT für Technologieentwicklung e.V. Einrichtung zum Plasmapolieren unter Verwendung eines flüssigen Elektrolyten
WO2011138463A1 (fr) * 2010-05-07 2011-11-10 Inp Greifswald - Leibniz-Institut Für Plasmaforschung Und Technologie E. V. Procédé de stérilisation par un gaz généré par un plasma
DE102011003781B3 (de) * 2011-02-08 2012-05-24 Meiko Maschinenbau Gmbh & Co. Kg Verfahren und Vorrichtung zur Speiseresteentsorgung

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190076537A1 (en) * 2016-03-18 2019-03-14 The George Washington University Compositions for treatment of cancer, methods and systems for forming the same
US11771770B2 (en) * 2016-03-18 2023-10-03 The George Washington University Compositions for treatment of cancer, methods and systems for forming the same
CN112031881A (zh) * 2020-08-06 2020-12-04 中天合创能源有限责任公司化工分公司 一种汽轮机在线除垢的方法
CN114278398A (zh) * 2021-12-09 2022-04-05 青岛华捷汽轮机有限公司 汽轮机防尘防腐蚀在线维保系统及其维保方法
CN115186400A (zh) * 2022-06-15 2022-10-14 中国船舶重工集团公司第七0三研究所 一种轴流压气机叶片失速与堵塞裕量的预设计方法
CN115186400B (zh) * 2022-06-15 2024-04-09 中国船舶重工集团公司第七0三研究所 一种轴流压气机叶片失速与堵塞裕量的预设计方法

Also Published As

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