CA2613575A1 - Protected carbon steel pipe for conveying flue gases in a heat exchange apparatus - Google Patents
Protected carbon steel pipe for conveying flue gases in a heat exchange apparatus Download PDFInfo
- Publication number
- CA2613575A1 CA2613575A1 CA002613575A CA2613575A CA2613575A1 CA 2613575 A1 CA2613575 A1 CA 2613575A1 CA 002613575 A CA002613575 A CA 002613575A CA 2613575 A CA2613575 A CA 2613575A CA 2613575 A1 CA2613575 A1 CA 2613575A1
- Authority
- CA
- Canada
- Prior art keywords
- carbon steel
- flue gases
- heat exchange
- steel pipe
- corrosion
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F1/00—Tubular elements; Assemblies of tubular elements
- F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
- F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
-
- 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
- F28F21/08—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
- F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Geometry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A protected carbon steel pipe for conveying flue gases in a heat exchange apparatus, comprising an outer jacket made of carbon steel, which is provided internally with a plurality of contiguous sectors made of corrosion-resistant material and provided with variously shaped fins, a continuous layer made of corrosion-resistant material which is interposed and in contact between the outer jacket and the plurality of contiguous sectors being provided.
Description
The invention relates to a protected carbon steel pipe for conveying flue gases in a heat exchange apparatus.
It is known that there are heat exchange apparatuses, such as for example fire tube boilers for generating hot water or another heat transfer fluid, or different apparatuses of industrial thermal cycles, such as for example condensers, economizers, heat exchangers, which provide for the presence of pipes designed to convey flue gases produced by combustion in appropriately provided furnaces, inserted within a vessel which contains the fluid to be heated.
The pipes comprised within such apparatuses are made of carbon steel in order to ensure optimum quality of the welded joints between the pipes and the structures of the apparatuses, which are also made of carbon steel, and in the case of apparatuses such as for example condensing boilers, in which the water vapor contained in the flue gases condenses inside the flue gas conveyance pipes, forming corrosive condensation, the internal surface of the pipes is protected in different manners.
For example, pipes have been proposed which comprise an outer jacket which is made of carbon steel and is provided internally with a plurality of contiguous sectors which are made of corrosion-resistant material and are provided with variously shaped fins, but in this embodiment flue gases can penetrate between one sector and the other, with the consequent possibility of contact of such flue gas, which has cooled and therefore carries corrosive condensation, with the outer jacket, which accordingly is not protected fully.
The aim of the present invention is to provide a protected carbon steel pipe which comprises the elements described above and in which full protection of the outer jacket made of carbon steel is ensured.
The proposed aim is achieved by a protected carbon steel pipe for conveying flue gases in a heat exchange apparatus, according to the invention, comprising an outer jacket made of carbon steel, which is provided internally with a plurality of contiguous sectors made of corrosion-resistant material and provided with variously shaped fins, characterized by the presence of a continuous layer made of corrosion-resistant material which is interposed and in contact between said outer jacket and said plurality of contiguous sectors.
Further characteristics and advantages of the present invention will become better apparent from the description of two preferred but not exclusive embodiments of the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a transverse sectional view of the protected carbon steel pipe according to the invention;
Figure 2 is a transverse sectional view according to a different embodiment.
With reference to Figure 1, the reference numeral 1 generally designates a pipe according to the invention, which comprises an outer jacket 2 made of carbon steel and provided internally with contiguous sectors 3, 4, 5 made of corrosion-resistant material, such as for example aluminum alloy or stainless steel, and which are provided with fins 3a, 4a, 5a respectively for the sectors 3, 4, 5.
An important feature of the invention is the presence of a continuous layer 6 made of corrosion-resistant material, which is interposed between the outer jacket 2 and the sectors 3, 4, 5 and adheres both to the jacket and to the sectors.
In this manner, the outer jacket 2 made of carbon steel has a complete protection against corrosion, because any infiltrations of flue gases between one sector and the other are blocked by the layer 6 and any contact between the flue gases and the jacket is thus prevented.
The embodiment of Figure 2 illustrates a pipe 7 in which the outer jacket 8 made of carbon steel is provided internally with a plurality of sectors 9 which are made of corrosion-resistant material and are provided with fins 9a, 9b, which are shaped so as to define a plurality of flue gas conveyance modules which are substantially shaped like sectors.
In the second embodiment, the reference numeral 10 designates the continuous layer made of corrosion-resistant material which, interposed so as to adhere between the outer jacket 8 and the plurality of sectors 9, provides full protection of the jacket against any infiltrations of flue gases which may occur between one sector and another.
The described invention is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements.
It is known that there are heat exchange apparatuses, such as for example fire tube boilers for generating hot water or another heat transfer fluid, or different apparatuses of industrial thermal cycles, such as for example condensers, economizers, heat exchangers, which provide for the presence of pipes designed to convey flue gases produced by combustion in appropriately provided furnaces, inserted within a vessel which contains the fluid to be heated.
The pipes comprised within such apparatuses are made of carbon steel in order to ensure optimum quality of the welded joints between the pipes and the structures of the apparatuses, which are also made of carbon steel, and in the case of apparatuses such as for example condensing boilers, in which the water vapor contained in the flue gases condenses inside the flue gas conveyance pipes, forming corrosive condensation, the internal surface of the pipes is protected in different manners.
For example, pipes have been proposed which comprise an outer jacket which is made of carbon steel and is provided internally with a plurality of contiguous sectors which are made of corrosion-resistant material and are provided with variously shaped fins, but in this embodiment flue gases can penetrate between one sector and the other, with the consequent possibility of contact of such flue gas, which has cooled and therefore carries corrosive condensation, with the outer jacket, which accordingly is not protected fully.
The aim of the present invention is to provide a protected carbon steel pipe which comprises the elements described above and in which full protection of the outer jacket made of carbon steel is ensured.
The proposed aim is achieved by a protected carbon steel pipe for conveying flue gases in a heat exchange apparatus, according to the invention, comprising an outer jacket made of carbon steel, which is provided internally with a plurality of contiguous sectors made of corrosion-resistant material and provided with variously shaped fins, characterized by the presence of a continuous layer made of corrosion-resistant material which is interposed and in contact between said outer jacket and said plurality of contiguous sectors.
Further characteristics and advantages of the present invention will become better apparent from the description of two preferred but not exclusive embodiments of the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:
Figure 1 is a transverse sectional view of the protected carbon steel pipe according to the invention;
Figure 2 is a transverse sectional view according to a different embodiment.
With reference to Figure 1, the reference numeral 1 generally designates a pipe according to the invention, which comprises an outer jacket 2 made of carbon steel and provided internally with contiguous sectors 3, 4, 5 made of corrosion-resistant material, such as for example aluminum alloy or stainless steel, and which are provided with fins 3a, 4a, 5a respectively for the sectors 3, 4, 5.
An important feature of the invention is the presence of a continuous layer 6 made of corrosion-resistant material, which is interposed between the outer jacket 2 and the sectors 3, 4, 5 and adheres both to the jacket and to the sectors.
In this manner, the outer jacket 2 made of carbon steel has a complete protection against corrosion, because any infiltrations of flue gases between one sector and the other are blocked by the layer 6 and any contact between the flue gases and the jacket is thus prevented.
The embodiment of Figure 2 illustrates a pipe 7 in which the outer jacket 8 made of carbon steel is provided internally with a plurality of sectors 9 which are made of corrosion-resistant material and are provided with fins 9a, 9b, which are shaped so as to define a plurality of flue gas conveyance modules which are substantially shaped like sectors.
In the second embodiment, the reference numeral 10 designates the continuous layer made of corrosion-resistant material which, interposed so as to adhere between the outer jacket 8 and the plurality of sectors 9, provides full protection of the jacket against any infiltrations of flue gases which may occur between one sector and another.
The described invention is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements.
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGES IS CLAIMED ARE DEFINED AS FOLLOWS:
A protected carbon steel pipe for conveying flue gases in a heat exchange apparatus, comprising an outer jacket made of carbon steel, which is provided internally with a plurality of contiguous sectors made of corrosion-resistant material and provided with variously shaped fins, wherein a continuous layer made of corrosion-resistant material which is interposed and in contact between the outer jacket and said plurality of contiguous sectors is provided.
PROPERTY OR PRIVILEGES IS CLAIMED ARE DEFINED AS FOLLOWS:
A protected carbon steel pipe for conveying flue gases in a heat exchange apparatus, comprising an outer jacket made of carbon steel, which is provided internally with a plurality of contiguous sectors made of corrosion-resistant material and provided with variously shaped fins, wherein a continuous layer made of corrosion-resistant material which is interposed and in contact between the outer jacket and said plurality of contiguous sectors is provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT000071A ITMN20060071A1 (en) | 2006-12-13 | 2006-12-13 | CARBON STEEL PIPE PROTECTED FOR THE CONVEYANCE OF FUMES IN HEAT EXCHANGE APPLIANCE. |
| ITMN2006A000071 | 2006-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2613575A1 true CA2613575A1 (en) | 2008-06-13 |
Family
ID=39111884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002613575A Abandoned CA2613575A1 (en) | 2006-12-13 | 2007-12-04 | Protected carbon steel pipe for conveying flue gases in a heat exchange apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20080142205A1 (en) |
| EP (1) | EP1936315A1 (en) |
| CA (1) | CA2613575A1 (en) |
| IT (1) | ITMN20060071A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120058044A1 (en) * | 2009-05-08 | 2012-03-08 | E.I. Du Pont De Nemours And Company | Process of using an improved flue in a titanium dioxide process |
| IT1401296B1 (en) * | 2010-06-16 | 2013-07-18 | Unical Ag Spa | TUBE IN BOILER WITH SMOKE PIPES. |
| EP2944910B1 (en) * | 2014-05-13 | 2016-05-25 | Grand Hall Enterprise Co., Ltd. | Heat exchanger tube |
| CN105757643B (en) * | 2016-04-11 | 2019-12-17 | 深圳市龙瑞泰兴能源环境科技有限公司 | Boiler using reinforced heat transfer element |
| US20180202724A1 (en) * | 2017-01-19 | 2018-07-19 | Dong Yong Hot Water System Inc. | Conductive structure of heat exchange pipe |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4116692A1 (en) * | 1991-05-22 | 1992-11-26 | Kreis Truma Geraetebau | HEAT EXCHANGER INSERT FOR AIR HEATERS |
| DE9405062U1 (en) * | 1994-03-24 | 1994-05-26 | Hoval Interliz Ag | Heat exchanger tube for boilers |
| ITMN20040019A1 (en) * | 2004-07-13 | 2004-10-13 | Unical Ag Spa | TUBE IN A SMOKE TUBE BOILER |
| WO2006111315A1 (en) | 2005-04-18 | 2006-10-26 | Unical Ag S.P.A. | Protected carbon steel pipe for fire tube heat exchange devices, particularly boilers |
-
2006
- 2006-12-13 IT IT000071A patent/ITMN20060071A1/en unknown
-
2007
- 2007-11-28 EP EP07023047A patent/EP1936315A1/en not_active Withdrawn
- 2007-11-30 US US11/987,436 patent/US20080142205A1/en not_active Abandoned
- 2007-12-04 CA CA002613575A patent/CA2613575A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1936315A1 (en) | 2008-06-25 |
| US20080142205A1 (en) | 2008-06-19 |
| ITMN20060071A1 (en) | 2008-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |
Effective date: 20131204 |