EP0314750A1 - Composition et procede servant a nettoyer les parties exposees au feu de dispositifs de chauffage - Google Patents
Composition et procede servant a nettoyer les parties exposees au feu de dispositifs de chauffageInfo
- Publication number
- EP0314750A1 EP0314750A1 EP19880904602 EP88904602A EP0314750A1 EP 0314750 A1 EP0314750 A1 EP 0314750A1 EP 19880904602 EP19880904602 EP 19880904602 EP 88904602 A EP88904602 A EP 88904602A EP 0314750 A1 EP0314750 A1 EP 0314750A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- compound
- cleaning
- fire
- tenside
- 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
Definitions
- the present invention relates to a composition for cleaning of fire-side parts of firing devices and a cleaning process applying this composition.
- Fire-side parts of boilers stoked with solid fuel, gas or oil need a permanent cleaning to remove combustion deposits from the boiler bottom, flue system and fire-tubes, because in consequence of these deposits the heat transfer coefficient is getting worse, fire-tubes and flue-system become chocked because of sooting as a consequence of the disadvantageous changing of the flue gas composition, etc.
- compositions described in it contains sodium hydrogen carbonate or sodium carbonate and a water soluble amine, such as triethanolamine, diethanolamine and/or triethanolamine phosphate in an aqueous solution.
- a pressure of 3-6 atmospheres about 44-88 psi
- carbon dioxide is necessary, because the formed triethanolammonium carbonate would decompose in air and could not display its cleaning effect.
- Object of the present invention is to obtain a composition for cleaning of fire-side parts of firing devices, which composition can be uged at elevated temperatures without a protecting atmosphere, furthermore results in a better efficiency of cleaning, and removes above all the sulfur compounds and persistent tarry sootings more effectively.
- composition containing an oxidating agent, a tenside and a compound suitable to maintain a basic milieu suites the aforementioned requirements and may be applicable for the effectual removal of inorganic and organic combustion deposits from fire-side parts of boilers stoked with any fuel.
- One of the ingredients of the composition according to the present invention is an oxidating agent, which is suitable for the rapid oxidation of organic filth and incrustant substances, making them soluble in water and oxidizing the sulfur compounds to sulfuric acid freely soluble in water.
- the resulting sulfuric acid in consequence of the basic milieu maintained by the composition forms immediately a neutral sulfate salt, which is not corrosive under the given conditions, so no corrosion effect occurs.
- the oxidizing agent in the composition may be hydrogen peroxide or any other water soluble peroxide compound with an oxidating feature, such as urea hydrogen peroxide addition compound.
- the proportion of the oxidating agent in the composition may be generally about 1 to 15%, preferably 2 to 10% on the basis of the total mass.
- the removal of the incrustant substances made water soluble by the action of the oxidizing agent from the metallic surface of the boiler may be significantly improved by the tenside component of the composition, which promotes both the stabilization of foam formation in the basic milieu and is suited for the removal of the greasy constituents of the sooting.
- the tenside may be ionic or non-ionic, e.g. an alkylsulfate, alkylsulfonate or alkylarylsulfonate.
- the proportion of the tenside in the composition may be generally about 5 to 25%, preferably about 10 to 20% on the basis of the total mass.
- the alkalinity of the composition may be assured practically by an alkali metal hydroxide, carbonate or hydrogen carbonate.
- Proportion of it may be generally about 65 to 94%, preferably about 70 to 88% on the basis of the total mass of the composition.
- the amount of the compound maintaining the basic milieu has to be enough to change the sulfuric acid forming on the action of the oxidizing agent into the appropriate sulfate salt immediately and to maintain the basic milieu.
- a composition of this invention may include the oxidating agent, the tenside and the compound maintaining the basic milieu together in a single admixture in solid foriu, however, it may include only the tenside and the oxidizing agent in an admixture, to which the oxidizing agent may be given in form of an aqueous solution immmediately before using .
- the effect of the oxidating agent is irreversible, because in the basic milieu the oxidized incrustant substances are transferred into the foam by the frothing agents, therefore they can not deposit again on the surface of the boiler and the foam containing the dirt can be completely removed by washing with water and the surface will be clean to metal.
- composition according to the present invention is also suitable for cleaning firing devices cooled only to a temperature of about 80-90oC, because it does not decompose even at this temperature, it is not necessary to use an inert carrier gas, it is also effective in presence of air and it is suitable for the removal of any combustion deposit from boilers.
- the following examples are intended to illustrate some characteristic compositions of the present invention and are in no way intended to limit the invention except as limited in the appended claims.
- a composition in form of powder contains the following ingredients:
- Example 2 5 grams of the obtained 100 grams of powder are dissolved in 1 litre of water at room temperature.
- Example 2 5 grams of the obtained 100 grams of powder are dissolved in 1 litre of water at room temperature.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Detergent Compositions (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
La composition décrite contient un agent d'oxydation, un dérivé tensio-actif et un composant assurant un milieu basique. L'application d'une telle composition permet d'enlever les dépôts de combustion qui se forment dans les chaudières sans produire d'effets corrosifs et permet de débarrasser la surface des résidus mécaniques avec un simple rinçage à l'eau.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
HU223887A HU198096B (en) | 1987-05-19 | 1987-05-19 | Composition for cleaning furnaces from the combustion side |
HU223887 | 1987-05-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0314750A1 true EP0314750A1 (fr) | 1989-05-10 |
Family
ID=10958447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880904602 Withdrawn EP0314750A1 (fr) | 1987-05-19 | 1988-05-18 | Composition et procede servant a nettoyer les parties exposees au feu de dispositifs de chauffage |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0314750A1 (fr) |
HU (1) | HU198096B (fr) |
PL (1) | PL272544A1 (fr) |
WO (1) | WO1988009368A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69012104T2 (de) * | 1989-12-20 | 1994-12-22 | Hughes Aircraft Co | Peroxidzusammensetzung zum entfernen von zunder und verfahren zu deren verwendung. |
US5269850A (en) * | 1989-12-20 | 1993-12-14 | Hughes Aircraft Company | Method of removing organic flux using peroxide composition |
DE69203851T2 (de) * | 1991-11-13 | 1995-12-07 | Hughes Aircraft Co | Verfahren und vorrichtung zur entfernung von verunreinigungen. |
US5244000A (en) * | 1991-11-13 | 1993-09-14 | Hughes Aircraft Company | Method and system for removing contaminants |
GB2349892A (en) * | 1999-05-13 | 2000-11-15 | Warwick Internat Group Ltd | Metal cleaning |
EP1143037B1 (fr) * | 2000-04-07 | 2007-02-14 | Asahi Glass Co., Ltd. | Procédé d'enlèvement d'un dépôt acide |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2882237A (en) * | 1956-05-29 | 1959-04-14 | Shell Dev | Method for oxidizing carbonaceous deposits |
DE2911259A1 (de) * | 1979-03-22 | 1980-10-02 | Shell Ag | Mittel zur feuerungsseitigen reinigung von heizkesseln |
DD223734A1 (de) * | 1984-05-17 | 1985-06-19 | Leuna Werke Veb | Verfahren zur abloesung von kohlenwasserstoffrueckstaenden von festen oberflaechen |
-
1987
- 1987-05-19 HU HU223887A patent/HU198096B/hu not_active IP Right Cessation
-
1988
- 1988-05-18 EP EP19880904602 patent/EP0314750A1/fr not_active Withdrawn
- 1988-05-18 WO PCT/HU1988/000035 patent/WO1988009368A1/fr not_active Application Discontinuation
- 1988-05-18 PL PL27254488A patent/PL272544A1/xx unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8809368A1 * |
Also Published As
Publication number | Publication date |
---|---|
HU198096B (en) | 1989-07-28 |
PL272544A1 (en) | 1989-02-20 |
HUT46733A (en) | 1988-11-28 |
WO1988009368A1 (fr) | 1988-12-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19890529 |
|
17Q | First examination report despatched |
Effective date: 19901105 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19910316 |