US20080142205A1 - 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
- US20080142205A1 US20080142205A1 US11/987,436 US98743607A US2008142205A1 US 20080142205 A1 US20080142205 A1 US 20080142205A1 US 98743607 A US98743607 A US 98743607A US 2008142205 A1 US2008142205 A1 US 2008142205A1
- Authority
- US
- United States
- 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
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 16
- 239000010962 carbon steel Substances 0.000 title claims abstract description 16
- 239000003546 flue gas Substances 0.000 title claims abstract description 13
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000013529 heat transfer fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
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
Definitions
- heat exchange apparatuses such as for example fire tube boilers for generating hot water or another heat transfer fluid
- 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.
- 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.
- 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, 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.
- FIG. 1 is a transverse sectional view of the protected carbon steel pipe according to the invention
- FIG. 2 is a transverse sectional view according to a different embodiment.
- 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 3 a , 4 a , 5 a 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.
- 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.
- FIG. 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 9 a , 9 b , which are shaped so as to define a plurality of flue gas conveyance modules which are substantially shaped like sectors.
- 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.
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMN2006A000071 | 2006-12-13 | ||
| IT000071A ITMN20060071A1 (it) | 2006-12-13 | 2006-12-13 | Tubo in acciaio al carbonio protetto per il convogliamento di fumi in apparecchio di scambio termico. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20080142205A1 true US20080142205A1 (en) | 2008-06-19 |
Family
ID=39111884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US11/987,436 Abandoned US20080142205A1 (en) | 2006-12-13 | 2007-11-30 | Protected carbon steel pipe for conveying flue gases in a heat exchange apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20080142205A1 (it) |
| EP (1) | EP1936315A1 (it) |
| CA (1) | CA2613575A1 (it) |
| IT (1) | ITMN20060071A1 (it) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757643A (zh) * | 2016-04-11 | 2016-07-13 | 深圳市龙瑞泰兴能源环境科技有限公司 | 一种使用强化传热件的锅炉 |
| US20180202724A1 (en) * | 2017-01-19 | 2018-07-19 | Dong Yong Hot Water System Inc. | Conductive structure of heat exchange pipe |
Families Citing this family (3)
| 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 (it) * | 2010-06-16 | 2013-07-18 | Unical Ag Spa | Tubo in caldaia a tubi di fumo. |
| EP2944910B1 (en) * | 2014-05-13 | 2016-05-25 | Grand Hall Enterprise Co., Ltd. | Heat exchanger tube |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070657A (en) * | 1994-03-24 | 2000-06-06 | Hoval Interliz Ag | Heat exchanger tube for heating boilers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4116692A1 (de) * | 1991-05-22 | 1992-11-26 | Kreis Truma Geraetebau | Waermetauschereinsatz fuer luftheizgeraete |
| ITMN20040019A1 (it) * | 2004-07-13 | 2004-10-13 | Unical Ag Spa | Tubo in caldaia a tubi di fumo |
| EP1872080A1 (en) | 2005-04-18 | 2008-01-02 | 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/it 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
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6070657A (en) * | 1994-03-24 | 2000-06-06 | Hoval Interliz Ag | Heat exchanger tube for heating boilers |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105757643A (zh) * | 2016-04-11 | 2016-07-13 | 深圳市龙瑞泰兴能源环境科技有限公司 | 一种使用强化传热件的锅炉 |
| US20180202724A1 (en) * | 2017-01-19 | 2018-07-19 | Dong Yong Hot Water System Inc. | Conductive structure of heat exchange pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2613575A1 (en) | 2008-06-13 |
| EP1936315A1 (en) | 2008-06-25 |
| ITMN20060071A1 (it) | 2008-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: UNICAL AG S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JAHIER, GIOVANNI;REEL/FRAME:020212/0393 Effective date: 20071122 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |