BE1005573A3 - Improvements to heat exchange in copper boiler wall. - Google Patents
Improvements to heat exchange in copper boiler wall. Download PDFInfo
- Publication number
- BE1005573A3 BE1005573A3 BE9100591A BE9100591A BE1005573A3 BE 1005573 A3 BE1005573 A3 BE 1005573A3 BE 9100591 A BE9100591 A BE 9100591A BE 9100591 A BE9100591 A BE 9100591A BE 1005573 A3 BE1005573 A3 BE 1005573A3
- Authority
- BE
- Belgium
- Prior art keywords
- heat exchanger
- coating
- wall
- seconds
- minutes
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/089—Coatings, claddings or bonding layers made from metals or metal alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Echangeurs de chaleur en cuivre pour chaudière murales, protégés par un revêtement de résine silicone ave des pigments d'oxyde de fer et de graphite. On décrit également un procédé pour appliquer efficacement une telle couche de protection sur les échangeurs de chaleur en cuivre.Copper heat exchangers for wall-mounted boilers, protected by a coating of silicone resin with pigments of iron oxide and graphite. A method is also described for effectively applying such a protective layer to copper heat exchangers.
Description
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DESCRIPTION PERFECTIONNEMENT AUX ECHANGEURS DE CHALEUR EN CUIVRE POUR CHAUDIERES MURALES
La présente invention se rapporte à un nouvel échangeur de chaleur en cuivre pour chaudières murales protégé efficacement contre la corrosion due au condensat acide et à la température élevée, conférant ainsi un haut rendement et une longévité accrue à l'échangeur de chaleur.
L'invention concerne également le procédé spécifique pour appliquer le revêtement nécessaire sur l'échangeur de chaleur qui doit être protégé.
Les revêtements destinés à protéger l'échangeur de chaleur de chaudières murales sont déjà connus dans l'art, et consistent généralement en des résines silicones pigmentées avec de l'aluminium.
Les revêtements aluminium-silicone connus offrent une protection efficace contre les températures élevées, mais ils présentent l'inconvénient de ne pas avoir la même efficacité contre le condensat en raison de la nature chimique du pigment à l'aluminium dont on sait qu'il est facilement attaqué par des solutions acides et qu'il se détériore en conséquence, avec perte importante de l'effet de barrage contre la corrosion du cuivre sous-jacent.
De plus, la tendance actuelle aux chaudières murales à haut rendement aggrave le problème de la corro-
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sion de l'échangeur de chaleur en cuivre par le condensat acide, accentuant ainsi le défaut des revêtements connus.
La présente invention a pour but de venir à bout de cet inconvénient en fournissant un revêtement destiné aux échangeurs de chaleur en cuivre équipant des chaudières murales qui, mis à part sa résistance aux fortes températures qui règnent dans les chaudières murales modernes, crée une barrière anticorrosion très efficace contre le condensat acide qui est particulièrement abondant dans les chaudières murales à haut rendement.
Ce but est atteint pour une grande partie en remplaçant ce pigment à l'aluminium par d'autres pigments de protection, comme un mélange d'oxyde de fer et de graphite, insensibles aux agressions de condensats acides, qui, outre les avantages cités, confèrent au revêtement et par conséquent à l'échangeur de chaleur une couleur noire qui intensifie et favorise le transfert de chaleur.
Ainsi, le revêtement de protection destiné aux échangeurs de chaleur en cuivre équipant des chaudières murales constitué par une résine silicone est caractérisé par le fait qu'il contient un mélange d'oxyde de fer et de graphite comme pigment.
Des expériences ont démontré qu'en raison de la géométrie complexe de l'échangeur de chaleur, l'efficacité d'un tel revêtement de protection dépend strictement d'un procédé d'application par immersion qui fait intervenir des paramètres opératoires rigoureusement définis.
Le procédé d'application par immersion dudit revêtement sur les échangeurs de chaleur en cuivre équipant des chaudières murales est caractérisé plus précisément par les étapes suivantes : la viscosité au gobelet Ford n 4 du revêtement est ajustée par dilution appropriée dans un solvant dans une plage de 40-55 secondes ; l'échangeur de chaleur à protéger est maintenu pendant un
<Desc/Clms Page number 3>
laps de temps de 20 à 30 secondes à ladite viscosité dans un bain de revêtement judicieusement agité ; on laisse sé- cher la couche de revêtement appliquée sur l'échangeur de chaleur pendant un laps de temps qui ne peut être inférieur à 30 minutes ; et pour terminer, cette couche de revêtement
0 est mise à polymériser dans un four à 100-190 C pendant un laps de temps qui ne peut être inférieur à 30 minutes.
Des résultats expérimentaux exceptionnels en termes d'échangeur de chaleur protégé efficacement et par conséquent à longue durée de vie ont été obtenus en
EMI3.1
immergeant l'échangeur de chaleur pendant 20 secondes dans un bain de résine silicone avec adjonction d'oxyde de fer 0 et de graphite d'une viscosité au gobelet Ford n 4 de 42 secondes, en séchant ensuite à l'air la couche de revêtement de l'échangeur de chaleur appliquée pendant 30
EMI3.2
minutes et finalement en mettant ladite couche de revêtement à polymériser pendant 30 minutes dans un four à 165 0 C.
<Desc / Clms Page number 1>
DESCRIPTION IMPROVEMENT IN COPPER HEAT EXCHANGERS FOR WALL BOILERS
The present invention relates to a new copper heat exchanger for wall-mounted boilers effectively protected against corrosion due to acid condensate and high temperature, thus giving high efficiency and increased longevity to the heat exchanger.
The invention also relates to the specific method for applying the necessary coating to the heat exchanger which is to be protected.
The coatings intended to protect the heat exchanger of wall-mounted boilers are already known in the art, and generally consist of silicone resins pigmented with aluminum.
Known aluminum-silicone coatings provide effective protection against high temperatures, but they have the disadvantage of not having the same effectiveness against condensate due to the chemical nature of the aluminum pigment which is known to be easily attacked by acid solutions and deteriorates as a result, with significant loss of the barrier effect against corrosion of the underlying copper.
In addition, the current trend towards high-efficiency wall-mounted boilers exacerbates the problem of corro-
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sion of the copper heat exchanger by the acid condensate, thus accentuating the defect in known coatings.
The object of the present invention is to overcome this drawback by providing a coating intended for copper heat exchangers fitted to wall boilers which, apart from its resistance to the high temperatures which prevail in modern wall boilers, creates an anti-corrosion barrier. very effective against acid condensate which is particularly abundant in high efficiency wall-hung boilers.
This goal is achieved for the most part by replacing this aluminum pigment with other protective pigments, such as a mixture of iron oxide and graphite, insensitive to the attacks of acid condensates, which, in addition to the advantages mentioned, give the coating and therefore the heat exchanger a black color which intensifies and promotes heat transfer.
Thus, the protective coating intended for copper heat exchangers equipping wall boilers constituted by a silicone resin is characterized by the fact that it contains a mixture of iron oxide and graphite as pigment.
Experiments have shown that due to the complex geometry of the heat exchanger, the effectiveness of such a protective coating depends strictly on a method of application by immersion which involves rigorously defined operating parameters.
The method of application by immersion of said coating on copper heat exchangers fitted to wall-mounted boilers is characterized more precisely by the following steps: the viscosity of the Ford No. 4 cup of the coating is adjusted by appropriate dilution in a solvent within a range of 40-55 seconds; the heat exchanger to be protected is maintained for one
<Desc / Clms Page number 3>
time period of 20 to 30 seconds at said viscosity in a judiciously stirred coating bath; the coating layer applied to the heat exchanger is allowed to dry for a period of time which cannot be less than 30 minutes; and finally, this coating layer
0 is set to polymerize in an oven at 100-190 C for a period of time which cannot be less than 30 minutes.
Exceptional experimental results in terms of an effectively protected heat exchanger with a long service life have been obtained in
EMI3.1
immersing the heat exchanger for 20 seconds in a silicone resin bath with the addition of iron oxide 0 and graphite with a viscosity to the Ford n 4 cup of 42 seconds, then air-drying the coating layer of the heat exchanger applied for 30
EMI3.2
minutes and finally by putting said coating layer to be polymerized for 30 minutes in an oven at 165 ° C.
Claims (3)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT02073990A IT1248980B (en) | 1990-06-22 | 1990-06-22 | PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS |
Publications (1)
Publication Number | Publication Date |
---|---|
BE1005573A3 true BE1005573A3 (en) | 1993-11-09 |
Family
ID=11171333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE9100591A BE1005573A3 (en) | 1990-06-22 | 1991-06-19 | Improvements to heat exchange in copper boiler wall. |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE1005573A3 (en) |
CH (1) | CH682258A5 (en) |
DE (1) | DE4120563A1 (en) |
ES (1) | ES2048032B1 (en) |
FR (1) | FR2663725B1 (en) |
GB (1) | GB2245276B (en) |
IT (1) | IT1248980B (en) |
NL (1) | NL193471C (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1300543C (en) * | 2003-10-22 | 2007-02-14 | 北京化工大学 | Method for corrosion resistant protection of condensed water system |
DE102006054723A1 (en) * | 2006-11-21 | 2008-05-29 | Behr Gmbh & Co. Kg | Heat exchanger, in particular exhaust gas heat exchanger |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2400962A1 (en) * | 1973-01-09 | 1974-07-11 | Jarl Hardenfelt | PAINTING OR COATING MATERIAL |
EP0110486A1 (en) * | 1982-12-07 | 1984-06-13 | Pyrotec N.V. | Installation (plant) for thermo-cracking a hydrocarbon starting material to alkene, shell and tube heat exchanger for use in such an installation and process for manufacturing shell and tube heat exchanger |
JPS60171349A (en) * | 1984-02-16 | 1985-09-04 | Matsushita Electric Ind Co Ltd | Heat exchanger |
US4582727A (en) * | 1984-03-20 | 1986-04-15 | Amax Inc. | Varnish-bonded, carbon-coated metal products |
JPH024195A (en) * | 1988-06-20 | 1990-01-09 | Furukawa Electric Co Ltd:The | Copper or copper alloy u-tube coated with inner surface anti-corrosion coating film for heat exchanger |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3380836A (en) * | 1965-08-13 | 1968-04-30 | Interchem Corp | Corrosion inhibiting pigment |
ES364354A1 (en) * | 1968-03-05 | 1970-12-16 | Hutter Kg S | Treatment of metal surfaces |
JPS5690853A (en) * | 1979-12-25 | 1981-07-23 | Toray Silicone Co Ltd | Silicone rubber composition |
DK559887A (en) * | 1986-11-28 | 1988-05-29 | Hoffmann La Roche | PROCEDURE FOR THE PREPARATION OF CARBINOOL DERIVATIVES |
-
1990
- 1990-06-22 IT IT02073990A patent/IT1248980B/en active IP Right Grant
-
1991
- 1991-06-17 CH CH1793/91A patent/CH682258A5/it not_active IP Right Cessation
- 1991-06-17 GB GB9113025A patent/GB2245276B/en not_active Expired - Fee Related
- 1991-06-19 BE BE9100591A patent/BE1005573A3/en not_active IP Right Cessation
- 1991-06-20 ES ES09101666A patent/ES2048032B1/en not_active Expired - Lifetime
- 1991-06-20 FR FR919107590A patent/FR2663725B1/en not_active Expired - Fee Related
- 1991-06-21 DE DE4120563A patent/DE4120563A1/en active Granted
- 1991-06-21 NL NL9101073A patent/NL193471C/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2400962A1 (en) * | 1973-01-09 | 1974-07-11 | Jarl Hardenfelt | PAINTING OR COATING MATERIAL |
EP0110486A1 (en) * | 1982-12-07 | 1984-06-13 | Pyrotec N.V. | Installation (plant) for thermo-cracking a hydrocarbon starting material to alkene, shell and tube heat exchanger for use in such an installation and process for manufacturing shell and tube heat exchanger |
JPS60171349A (en) * | 1984-02-16 | 1985-09-04 | Matsushita Electric Ind Co Ltd | Heat exchanger |
US4582727A (en) * | 1984-03-20 | 1986-04-15 | Amax Inc. | Varnish-bonded, carbon-coated metal products |
JPH024195A (en) * | 1988-06-20 | 1990-01-09 | Furukawa Electric Co Ltd:The | Copper or copper alloy u-tube coated with inner surface anti-corrosion coating film for heat exchanger |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 10, no. 10 (M-446)(2067) 16 Janvier 1986 & JP-A-60 171 349 ( MATSUSHITA DENKI SANGYO KK ) 4 Septembre 1985 * |
PATENT ABSTRACTS OF JAPAN vol. 14, no. 135 (M-949)14 Mars 1990 & JP-A-02 004 195 ( FURUKAWA ELECTRIC CO LTD ) 9 Janvier 1990 * |
Also Published As
Publication number | Publication date |
---|---|
NL9101073A (en) | 1992-01-16 |
FR2663725B1 (en) | 1994-03-04 |
DE4120563C2 (en) | 1993-04-29 |
IT1248980B (en) | 1995-02-11 |
ES2048032B1 (en) | 1994-10-01 |
GB2245276A (en) | 1992-01-02 |
NL193471C (en) | 1999-11-02 |
IT9020739A0 (en) | 1990-06-22 |
NL193471B (en) | 1999-07-01 |
GB2245276B (en) | 1994-04-13 |
FR2663725A1 (en) | 1991-12-27 |
CH682258A5 (en) | 1993-08-13 |
ES2048032A1 (en) | 1994-03-01 |
IT9020739A1 (en) | 1991-12-22 |
GB9113025D0 (en) | 1991-08-07 |
DE4120563A1 (en) | 1992-01-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CA | Change of address of the owner of the patent | ||
CH | Change of patent owner | ||
RE | Patent lapsed |
Owner name: *BIASI S.P.A. Effective date: 20020630 |