EP1598629B1 - Procédé de nettoyage chimique d'une installation de gaz et de vapeur - Google Patents

Procédé de nettoyage chimique d'une installation de gaz et de vapeur 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
Authority
EP
European Patent Office
Prior art keywords
plant
deionate
circulation
volumes
pipes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04011890A
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German (de)
English (en)
Other versions
EP1598629A1 (fr
Inventor
Heinz-Peter Borchardt
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.)
Therm-Service fur Kraftwerke und Industrie GmbH
Original Assignee
Therm-Service fur Kraftwerke und Industrie 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.)
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Publication date
Application filed by Therm-Service fur Kraftwerke und Industrie GmbH filed Critical Therm-Service fur Kraftwerke und Industrie GmbH
Priority to ES04011890T priority Critical patent/ES2255694T3/es
Priority to AT04011890T priority patent/ATE313056T1/de
Priority to DE502004000183T priority patent/DE502004000183D1/de
Priority to EP04011890A priority patent/EP1598629B1/fr
Publication of EP1598629A1 publication Critical patent/EP1598629A1/fr
Application granted granted Critical
Publication of EP1598629B1 publication Critical patent/EP1598629B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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.

Landscapes

  • 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)

Claims (6)

  1. Procédé de nettoyage chimique d'une installation ou centrale de gaz et de vapeur (GV) contenant préchauffeur, évaporateur, surchauffeur, conduites, pompes, soupapes, clapets, réservoirs et/ou cuves et similaires, comprenant les étapes suivantes, qui concordent étroitement au niveau de leurs paramètres et substances et consomment au maximum six volumes unité installation d'eau déminéralisée :
    a. remplissage de l'installation avec de l'eau déminéralisée, aération et dépressurisation des conduites pour contrôler l'étanchéité, le cas échéant remédiation aux lacunes d'étanchéité,
    b. prérinçage avec au maximum deux volumes unité installation d'eau déminéralisée pour éliminer les impuretés grossières dans le procédé en circuit ouvert (CO) à une vitesse de > 0,5 m/s jusqu'à obtention d'une turbidité à la sortie (8) = < 0,5 (photométriquement 435 nm, cuvette 50 mm),
    c. addition d'une solution mouillante (dégraissage) au niveau de la station de pompage (2) dans le réservoir de mélange, en mode de fonctionnement circuit, pour éliminer les résidus d'huile et de graisse, jusqu'à obtention d'une concentration de 0,05 à 0,1 % en volume, temps de repos d'au moins 2 heures pendant le chauffage à une température de 50 à 80°C,
    d. arrêt du chauffage, après avoir ajusté une température de 50 à 80°C au reflux (10),
    e. addition d'une solution de décapage/nettoyage compatible avec la solution mouillante prenant la forme d'environ 0,8 à 1,5 % en volume d'acide liquide inhibé, par le biais du réservoir de mélange de la station de pompage dans le procédé en circuit pour une vitesse de circulation de > 0,2 m/s dans les conduites à traiter,
    f. détermination répétée de la concentration en Fe pour un acide HF suffisamment libre, jusqu'à ce que les valeurs Fe soient constantes,
    g. refoulement de l'acide HF par addition d'au maximum quatre volumes unité installation d'eau déminéralisée, aération de l'installation, vérification de la conductivité dans le procédé haute vitesse, jusqu'à ce que celle-ci se situe à < 10 ou 20 µs/cm au-dessus de la valeur d'entrée,
    h. reprise du circuit de circulation et élévation du pH à > 10,0, (alcalisation) addition de H2O2 pour former une couche passive sur les surfaces internes métalliques des conduites jusqu'à mesurer un potentiel rédox positif > +10mV,
    i. rinçage de toutes les conduites, vidange des solutions présentes.
  2. Procédé selon la revendication 1, caractérisé en ce que le prérinçage des étapes a et b est réalisé avec au maximum 0,5 à 1 volume unité installation d'eau déminéralisée, aucun volume unité installation supplémentaire d'eau déminéralisée n'étant mis en oeuvre pour les étapes adjointes c à f, et des volumes unité installation de 3 à 3,5 d'eau déminéralisée étant mis en oeuvre à l'étape g.
  3. Procédé selon la revendication 1 et 2, caractérisé en ce que l'élimination des particules superficielles > 100 nm se fait par le biais d'un filtre (4) installé dans le bypass pendant la circulation de la solution mouillante.
  4. Procédé selon l'une ou plusieurs des revendications précédentes 1 à 3, caractérisé en ce qu'environ 1 % en volume d'acide liquide inhibé est additionné à la solution de décapage/nettoyage à l'étape e.
  5. Procédé selon l'une ou plusieurs des revendications précédentes 1 à 4, caractérisé en ce que la circulation est arrêtée à l'étape f et que l'on passe à une phase de repos durant jusqu'à 12 heures.
  6. Procédé selon l'une ou plusieurs des revendications précédentes 1 à 5, caractérisé en ce qu'au moins 90 % des eaux usées sont réintroduites dans la circulation d'eau de la centrale après traitement dans une station d'épuration des eaux usées.
EP04011890A 2004-05-19 2004-05-19 Procédé de nettoyage chimique d'une installation de gaz et de vapeur Expired - Lifetime EP1598629B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES04011890T ES2255694T3 (es) 2004-05-19 2004-05-19 Procedimiento de limpieza quimica de una instalacion de gas y vapor.
AT04011890T ATE313056T1 (de) 2004-05-19 2004-05-19 Verfahren zum chemischen reinigen einer gas- und dampfanlage
DE502004000183T DE502004000183D1 (de) 2004-05-19 2004-05-19 Verfahren zum chemischen Reinigen einer Gas- und Dampfanlage
EP04011890A EP1598629B1 (fr) 2004-05-19 2004-05-19 Procédé de nettoyage chimique d'une installation de gaz et de vapeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04011890A EP1598629B1 (fr) 2004-05-19 2004-05-19 Procédé de nettoyage chimique d'une installation de gaz et de vapeur

Publications (2)

Publication Number Publication Date
EP1598629A1 EP1598629A1 (fr) 2005-11-23
EP1598629B1 true EP1598629B1 (fr) 2005-12-14

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EP04011890A Expired - Lifetime EP1598629B1 (fr) 2004-05-19 2004-05-19 Procédé de nettoyage chimique d'une installation de gaz et de vapeur

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EP (1) EP1598629B1 (fr)
AT (1) ATE313056T1 (fr)
DE (1) DE502004000183D1 (fr)
ES (1) ES2255694T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102269400A (zh) * 2011-07-26 2011-12-07 西安热工研究院有限公司 一种电厂锅炉化学清洗中双氧水的加药装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102537930B (zh) * 2010-12-17 2015-04-01 冯伟忠 直流锅炉的清洗方法
CN102944137A (zh) * 2012-11-09 2013-02-27 青海电力科学试验研究院 一种用于锅炉化学清洗的管道装置
CN103063082B (zh) * 2012-12-31 2014-07-16 江苏肯创环境科技股份有限公司 Ggh不停运清洗阻垢工艺及其装置
CN103090700B (zh) * 2013-03-04 2015-04-01 杨铭 折流高效热交换器
CN114951159B (zh) * 2022-06-02 2023-07-07 中天钢铁集团(南通)有限公司 一种冶金制氧管道热态清洗方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT281541B (de) * 1966-08-02 1970-05-25 Beratherm Ag Verfahren zum Beizen von metallischen Innenflächen geschlossener Gefäße
DE3533886A1 (de) * 1985-04-16 1987-03-26 Kraftwerk Union Ag Reinigungsverfahren
DE19843442C1 (de) * 1998-09-22 2000-03-02 Siemens Ag Vorrichtung und Verfahren zur Reinigung von dampfführenden Komponenten in Anlagen mit Dampfkesseln

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102269400A (zh) * 2011-07-26 2011-12-07 西安热工研究院有限公司 一种电厂锅炉化学清洗中双氧水的加药装置
CN102269400B (zh) * 2011-07-26 2013-04-10 西安热工研究院有限公司 一种电厂锅炉化学清洗中双氧水的加药装置

Also Published As

Publication number Publication date
DE502004000183D1 (de) 2006-02-02
EP1598629A1 (fr) 2005-11-23
ATE313056T1 (de) 2005-12-15
ES2255694T3 (es) 2006-07-01

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