IT9020739A1 - PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS - Google Patents
PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS Download PDFInfo
- Publication number
- IT9020739A1 IT9020739A1 IT020739A IT2073990A IT9020739A1 IT 9020739 A1 IT9020739 A1 IT 9020739A1 IT 020739 A IT020739 A IT 020739A IT 2073990 A IT2073990 A IT 2073990A IT 9020739 A1 IT9020739 A1 IT 9020739A1
- Authority
- IT
- Italy
- Prior art keywords
- coating
- exchanger
- heat exchanger
- wall
- seconds
- Prior art date
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 12
- 229910052802 copper Inorganic materials 0.000 title claims description 12
- 239000010949 copper Substances 0.000 title claims description 12
- 238000000576 coating method Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 239000000049 pigment Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000011253 protective coating Substances 0.000 claims description 4
- 229920002050 silicone resin Polymers 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007605 air drying Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 230000000379 polymerizing effect Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 239000004447 silicone coating Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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)
Description
DESCRIZIONE DESCRIPTION
La presente invenzione concerne un nuovo scambiatore di calore in rame per caldaie murali che, essendo efficacemente protetto dai fenomeni corrosivi dovuti alle condense acide ed alle elevate temperature, consente il conseguimento di alti rendimenti e una maggiore durata della vita dello scambiatore stesso. The present invention relates to a new copper heat exchanger for wall-hung boilers which, being effectively protected from corrosive phenomena due to acid condensation and high temperatures, allows the achievement of high yields and a longer life span of the exchanger itself.
L'invenzione concerne pure lo specifico procedimento per l'applicazione di un siffatto rivestimento sullo scambiatore da proteggere. The invention also relates to the specific process for applying such a coating to the exchanger to be protected.
Dallo stato della tecnica sono già noti rivestimenti utilizzati per la protezione dello scambiatore di calore di caldaie murali, i quali sono generalmente costituiti da resine siliconiche pigmentate con allumino. From the state of the art coatings used for protecting the heat exchanger of wall-hung boilers are already known, which generally consist of silicone resins pigmented with aluminum.
I suddetti rivestimenti allumino- siliconici noti risultano efficacemente protettivi nei riguardi delle alte temperature ma presentano l 'inconveniente di non essere altrettanto efficaci nei confronti delle condense a causa della natura chimica del pigmento allumino che, come noto, è facilmente attaccabile da soluzioni acide e quindi deteriorabile con conseguente perdita dell'effetto barriera contro la corrosione del rame sottostante. The above known aluminum-silicone coatings are effectively protective against high temperatures but have the drawback of not being as effective against condensates due to the chemical nature of the aluminum pigment which, as known, is easily attacked by acid solutions and therefore perishable with consequent loss of the corrosion barrier effect of the underlying copper.
D'altra parte l'attuale tendenza a realizzare caldaie murali ad alto rendimento enfatizza il problema della corrosione del rame dello scambiatore per condense acide esaltando la suddetta carenza dei rivestimenti noti. On the other hand, the current tendency to produce high-efficiency wall-hung boilers emphasizes the problem of corrosion of the copper of the exchanger for acid condensates, enhancing the aforementioned lack of known coatings.
Scopo della presente invenzione è appunto quello di ovviare al suddetto inconveniente e di fornire quindi un rivestimento per lo scambiatore di calore in rame di caldaie murali che, oltre ad essere resistente alle alte temperature proprie delle moderne caldaie murali, crei una efficace barriera altamente anticorrosiva e quindi protettiva nei confronti delle condense acide particolarmente abbondanti nelle caldaie murali ad alto rendimento . The purpose of the present invention is precisely to obviate the aforementioned drawback and therefore to provide a coating for the copper heat exchanger of wall-hung boilers which, in addition to being resistant to the high temperatures typical of modern wall-mounted boilers, creates an effective highly anticorrosive barrier and therefore protective against particularly abundant acid condensates in high-performance wall-hung boilers.
Ciò viene sostanzialmente conseguito sostituendo il suddetto pigmento alluminio con altri pigmenti protettivi inerti all'azione aggressiva delle condense acide quali una miscela di ossido di ferro e grafite, che oltre ai suddetti vantaggi, conferisce al rivestimento e conseguentemente allo scambiatore anche una colorazione nera la quale accresce e favorisce lo scambio termico. This is substantially achieved by replacing the aforementioned aluminum pigment with other protective pigments inert to the aggressive action of acid condensates such as a mixture of iron oxide and graphite, which in addition to the aforementioned advantages, also gives the coating and consequently the exchanger a black color which increases and promotes heat exchange.
In definitiva, il rivestimento di protezione per lo scambiatore di calore in rame di caldaie murali, detto rivestimento essendo costituito da una resina siliconica, è caratterizzato dal fatto di contenere come pigmento una miscela di ossido di ferro e grafite. Ultimately, the protective coating for the copper heat exchanger of wall-hung boilers, said coating being made up of a silicone resin, is characterized by the fact that it contains a mixture of iron oxide and graphite as a pigment.
D'altra parte, come riscontrato sperimentalmente, l'efficacia di un siffatto rivestimento protettivo risulta strettamente vincolata, data la complessa geometria dello scambiatore, ad un particolare procedimento di applicazione per immersione che prevede ben definiti parametri operativi. On the other hand, as experimentally found, the effectiveness of such a protective coating is strictly linked, given the complex geometry of the exchanger, to a particular application process by immersion which provides for well-defined operating parameters.
Più specificatamente il procedimento per l'applicazione del suddetto rivestimento sullo scambiatore di calore in rame di caldaie murali, detto procedimento essendo per immersione, è caratterizzato dal fatto di comprendere le fasi di regolare la viscosità del rivestimento, mediante appropriata diluizione con solvente, entro un range di 40-55 secondi in tazza FORD n.4, di mantenere lo scambiatore da proteggere nel bagno di rivestimento alla suddetta viscosità e convenientemente movimentato per un tempo compreso tra 20 e 30 secondi, di effettuare l'appassimento dello strato di rivestimento applicato allo scambiatore per un tempo non inferiore a 30 minuti in aria ed infine di effettuare la polimerizzazione del suddetto strato di rivestimento in forno a 100÷190° C per un tempo non inferiore a 30 minuti. More specifically, the process for applying the aforementioned coating on the copper heat exchanger of wall boilers, said process being by immersion, is characterized in that it comprises the steps of regulating the viscosity of the coating, by means of appropriate dilution with solvent, within a range of 40-55 seconds in FORD cup n.4, to keep the exchanger to be protected in the coating bath at the aforementioned viscosity and conveniently moved for a time between 20 and 30 seconds, to carry out the drying of the coating layer applied to the exchanger for a time of not less than 30 minutes in air and finally to carry out the polymerization of the aforementioned coating layer in an oven at 100 ÷ 190 ° C for a time of not less than 30 minutes.
In particolare si sono ottenuti sperimentalmente risultati eccezionalmente buoni di uno scambiatore di rame efficacemente protetto e quindi di lunga vita immergendo per 20 secondi lo scambiatore in un bagno di una resina siliconica all'ossido di ferro e grafite avente una viscosità di 42 secondi in tazza FORD n.4, nel far appassire od essiccare all'aria lo strato di rivestimento applicato allo scambiatore per 30 minuti ed infine nel polimerizzare il suddetto strato di rivestimento in forno per 30 minuti a 165° C. In particular, exceptionally good results have been obtained experimentally with an effectively protected and therefore long-lasting copper exchanger by immersing the exchanger for 20 seconds in a bath of an iron oxide and graphite silicone resin having a viscosity of 42 seconds in a FORD cup. 4, in drying or air-drying the coating layer applied to the exchanger for 30 minutes and finally in polymerizing the aforementioned coating layer in the oven for 30 minutes at 165 ° C.
Claims (3)
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT02073990A IT1248980B (en) | 1990-06-22 | 1990-06-22 | PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS |
| CH1793/91A CH682258A5 (en) | 1990-06-22 | 1991-06-17 | |
| GB9113025A GB2245276B (en) | 1990-06-22 | 1991-06-17 | Improved copper heat exchanger for wall-mounted boilers |
| BE9100591A BE1005573A3 (en) | 1990-06-22 | 1991-06-19 | Improvements to heat exchange in copper boiler wall. |
| FR919107590A FR2663725B1 (en) | 1990-06-22 | 1991-06-20 | IMPROVED COPPER HEAT EXCHANGER FOR WALL-MOUNTED WATER HEATERS. |
| ES09101666A ES2048032B1 (en) | 1990-06-22 | 1991-06-20 | COATING FOR A PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS. |
| DE4120563A DE4120563A1 (en) | 1990-06-22 | 1991-06-21 | COPPER HEAT EXCHANGER FOR WALL MOUNTABLE BOILERS |
| NL9101073A NL193471C (en) | 1990-06-22 | 1991-06-21 | Method of applying a protective coating on a copper heat exchanger. |
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 (3)
| Publication Number | Publication Date |
|---|---|
| IT9020739A0 IT9020739A0 (en) | 1990-06-22 |
| IT9020739A1 true IT9020739A1 (en) | 1991-12-22 |
| IT1248980B IT1248980B (en) | 1995-02-11 |
Family
ID=11171333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT02073990A IT1248980B (en) | 1990-06-22 | 1990-06-22 | PERFECTED COPPER HEAT EXCHANGER FOR WALL BOILERS |
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 |
Family Cites Families (9)
| 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 |
| DK132333C (en) * | 1973-01-09 | 1976-04-26 | J Hardenfelt | FILLER OR COATING MIXTURE WITH METAL LOOKING EFFECT |
| JPS5690853A (en) * | 1979-12-25 | 1981-07-23 | Toray Silicone Co Ltd | Silicone rubber composition |
| NL8204731A (en) * | 1982-12-07 | 1984-07-02 | Pyrotec Nv | INSTALLATION FOR THERMAL CRACKING OF A HYDROCARBON OUTPUT MATERIAL TO OLEGINS, TUBE HEAT EXCHANGER USED IN SUCH INSTALLATION AND METHOD FOR MANUFACTURING A 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 |
| DK559887A (en) * | 1986-11-28 | 1988-05-29 | Hoffmann La Roche | PROCEDURE FOR THE PREPARATION OF CARBINOOL DERIVATIVES |
| 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 |
-
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 NL NL9101073A patent/NL193471C/en not_active IP Right Cessation
- 1991-06-21 DE DE4120563A patent/DE4120563A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE4120563A1 (en) | 1992-01-02 |
| BE1005573A3 (en) | 1993-11-09 |
| GB9113025D0 (en) | 1991-08-07 |
| IT9020739A0 (en) | 1990-06-22 |
| GB2245276A (en) | 1992-01-02 |
| DE4120563C2 (en) | 1993-04-29 |
| CH682258A5 (en) | 1993-08-13 |
| IT1248980B (en) | 1995-02-11 |
| NL193471B (en) | 1999-07-01 |
| NL9101073A (en) | 1992-01-16 |
| ES2048032A1 (en) | 1994-03-01 |
| GB2245276B (en) | 1994-04-13 |
| NL193471C (en) | 1999-11-02 |
| FR2663725B1 (en) | 1994-03-04 |
| FR2663725A1 (en) | 1991-12-27 |
| ES2048032B1 (en) | 1994-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 0001 | Granted | ||
| TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19970627 |