EP0658736B1 - Rippenrohrwärmeaustauscher - Google Patents
Rippenrohrwärmeaustauscher Download PDFInfo
- Publication number
- EP0658736B1 EP0658736B1 EP93850231A EP93850231A EP0658736B1 EP 0658736 B1 EP0658736 B1 EP 0658736B1 EP 93850231 A EP93850231 A EP 93850231A EP 93850231 A EP93850231 A EP 93850231A EP 0658736 B1 EP0658736 B1 EP 0658736B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fins
- heat exchanger
- tubular body
- carbon content
- ribs
- 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.)
- Expired - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 22
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 11
- 239000010962 carbon steel Substances 0.000 claims description 11
- 239000003546 flue gas Substances 0.000 description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010792 warming Methods 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
- 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
-
- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside 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
- 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
- F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
- F28F1/124—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and being formed of pins
-
- 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
Definitions
- the present invention relates to a heat exchange element with a tubular body and surface enlarging elements present thereon consisting of a number of fins welded to the outside of the body and pointing outwards from the latter, the tubular body and the entire fins being made of carbon steel.
- a heat exchanger is known from WO-A-9 002 917.
- finned tube heat exchangers which are also referred to as finned tubes
- finned tubes are known in a wide variety of designs and are used for various purposes.
- such finned tubes are very often used for cylinder steam boilers.
- generic finned tube heat exchangers have long been used for extracting heat from the flue gases as they pass through flue gas tubes, the flue gas tubes extending vertically upwards through the water and steam space above the boiler firing.
- the finned tubes are arranged coaxially to the flue gas tubes and within the flue gas tubes and connected to the water and steam space mentioned in order to ensure heat transfer to the medium in question here.
- a disadvantage of these known finned tubes is that a tendency to form cracks in the weld joint between the fins and the tubular body or between the latter and adjacent parts of the fins has often been found. This tendency is particularly noticeable for ribs which are bent by a cold deformation after welding to the tubular body, but can also occur with other ribs. In practice, the tendency to crack formation described above can cause serious problems. Very small initial cracks that arise during the production process can actually grow larger despite their originally minimal size Broaden cracks and gradually weaken the ribs in such a way that they are broken off from the tubular body by applying greater mechanical forces, such as those that occur, for example, when cleaning the flue gas ducts in which the finned tubes are arranged.
- the purpose of the present invention is to provide an improved heat exchange element of the type described in the generic type, in which the risk of cracking as described above is largely eliminated.
- the finned tube heat exchanger proposed according to the invention is characterized in that the fins are made from a carbon content with a significantly lower carbon content than the carbon content of the carbon content used for the production of the tubular body.
- the invention is based on the knowledge that the tendency towards any cracks, which is found in known finned tubes, can be attributed to the fact that the material in the parts of the fins that adjoin the tubular body is heated and then cooled when the fins are welded on the tubular body, get an increased brittleness due to the accidental hardening.
- the invention also proceeds from the finding that this inadvertent hardening is related to the fact that the fins were previously made from normal commercial grade carbon steel with approximately the same carbon content as the material used to make the tubular body.
- tubular body is usually made of a carbon steel with a carbon content of at least about 0.1%
- Ribs are preferably made from a material with a carbon content of at most about 0.05%.
- the ribs can preferably be produced from a material with a carbon content of only about 0.03%.
- the use of a steel with a very low carbon content in the ribs proposed according to the invention results in a further advantage in addition to the above-mentioned reduction in the risk of crack formation.
- the low carbon content leads to an improved thermal conductivity of the ribs, and thus to an improved thermal efficiency of the ribs and consequently to an improved total heat transfer coefficient of the tubular body.
- the cylinder steam boiler shown only partially in FIG. 1, generally designated 10, is provided with a furnace 11 and a pressure vessel 12 present above it, the latter forming the water and steam space of the boiler.
- Various vertical flue gas pipes 13 extend through the pressure vessel 12 and discharge the flue gases from the furnace 11 to a flue gas hood 14 located above the pressure vessel 12, from which the flue gases can be drawn off via a flue gas outlet 15.
- each flue gas pipe 13 there is a finned-tube heat exchanger, generally designated 16, consisting of a tubular body 17 and surface enlarging elements arranged thereon.
- these surface enlargement elements consist of a large number of ribs 18, one end of which is welded to the outside of the tubular body 17 and which protrude outwards from the body.
- Each finned tube heat exchanger 16 is provided at its lower end with an inlet line 19, by means of which the heat exchanger with that formed in the pressure vessel 12 Water and steam space is connected via an opening 20 in the wall of the associated flue gas pipe 13, while the heat exchanger is provided at its upper end with an outlet line 21, by means of which the heat exchanger with the pressure vessel 12 via an opening 22 in the wall of the flue gas pipe 13 communicates.
- the finned tube heat exchangers 16 can be provided with fins 18 which protrude in radial directions from the tubular body 17 and which are at least the same length over most of the tubular body.
- the ribs 18 can preferably be formed in the manner shown in FIG. 3, namely with a decreasing length in the direction of the lower end of the tubular body in order to ensure this that they are not exposed to excessive warming.
- the upper part of the tubular body can also be equipped with bent ribs of greater length, ie after the normal ribs have been welded to the tubular body. Such a longer and bent rib 18 'is indicated in Fig. 2 with dash-dotted lines.
- Both the tubular body 17 and the ribs 18 are made of carbon steel.
- the tubular body 17 is in a known manner made of a material with an appropriate carbon content of at least about 0.1% in order to achieve the desired strength properties.
- the material used for the production of the ribs 18 should preferably have a maximum carbon content of approximately 0.05%. If the ribs as indicated in Fig. 2 for the rib 18 'is after welding on the tubular If the body is exposed to a deformation, it is advisable to manufacture these ribs from a material with a carbon content of only about 0.03%.
- the invention is not limited to the embodiments described above and shown in FIGS. 1-4, but can also be used for finned tube heat exchangers of another design. 5, 6 and 7, examples of other uses for finned tube heat exchanges 16 ', 16' 'and 16' '' are illustrated.
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)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Details Of Heat-Exchange And Heat-Transfer (AREA)
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK93850231.7T DK0658736T3 (da) | 1993-12-14 | 1993-12-14 | Ribberørsvarmeveksler |
ES93850231T ES2101285T3 (es) | 1993-12-14 | 1993-12-14 | Intercambiador de calor con cuerpo en forma tubular. |
EP93850231A EP0658736B1 (de) | 1993-12-14 | 1993-12-14 | Rippenrohrwärmeaustauscher |
DE59305979T DE59305979D1 (de) | 1993-12-14 | 1993-12-14 | Rippenrohrwärmeaustauscher |
NO944756A NO303087B1 (no) | 1993-12-14 | 1994-12-08 | Varmevekslerr÷r |
FI945801A FI945801A (fi) | 1993-12-14 | 1994-12-09 | Lämmönvaihdinputki |
JP30894194A JP3567000B2 (ja) | 1993-12-14 | 1994-12-13 | 熱交換チューブ |
KR1019940033986A KR100359141B1 (ko) | 1993-12-14 | 1994-12-13 | 열교환튜브 |
CN94119606A CN1052065C (zh) | 1993-12-14 | 1994-12-13 | 热交换器管 |
US08/355,072 US5626187A (en) | 1993-12-14 | 1994-12-13 | Heat-exchanger tube |
PL94306258A PL306258A1 (en) | 1993-12-14 | 1994-12-13 | Heat exchanger tube |
GR970400842T GR3023182T3 (en) | 1993-12-14 | 1997-04-21 | Heat exchanger with finned tubes. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP93850231A EP0658736B1 (de) | 1993-12-14 | 1993-12-14 | Rippenrohrwärmeaustauscher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0658736A1 EP0658736A1 (de) | 1995-06-21 |
EP0658736B1 true EP0658736B1 (de) | 1997-03-26 |
Family
ID=8215312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93850231A Expired - Lifetime EP0658736B1 (de) | 1993-12-14 | 1993-12-14 | Rippenrohrwärmeaustauscher |
Country Status (12)
Country | Link |
---|---|
US (1) | US5626187A (ko) |
EP (1) | EP0658736B1 (ko) |
JP (1) | JP3567000B2 (ko) |
KR (1) | KR100359141B1 (ko) |
CN (1) | CN1052065C (ko) |
DE (1) | DE59305979D1 (ko) |
DK (1) | DK0658736T3 (ko) |
ES (1) | ES2101285T3 (ko) |
FI (1) | FI945801A (ko) |
GR (1) | GR3023182T3 (ko) |
NO (1) | NO303087B1 (ko) |
PL (1) | PL306258A1 (ko) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE505923C2 (sv) * | 1996-01-26 | 1997-10-20 | Aalborg Ind As | Anordning vid inloppsrör till värmeväxlingsenhet i rökgastub |
KR100918551B1 (ko) * | 2004-04-01 | 2009-09-21 | 알보르그 인더스트리 에이/에스 | 열교환기 및 열교환기를 포함하는 보일러 |
KR100640290B1 (ko) * | 2005-01-29 | 2006-11-10 | 강림기연 주식회사 | 열교환 튜브의 제조방법 |
US7823544B2 (en) * | 2008-01-04 | 2010-11-02 | Ecr International, Inc. | Steam boiler |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2093686A (en) * | 1936-10-27 | 1937-09-21 | Jr Thomas E Murray | Method of and means for operating boilers of certain types |
US2566318A (en) * | 1949-03-21 | 1951-09-04 | Svenska Maskinverken Ab | Method of making an extended surface heat exchange device or similar composite article |
US2719354A (en) * | 1950-11-13 | 1955-10-04 | Svenska Maskinverken Ab | Method of making extended surface heat exchanger |
US3731738A (en) * | 1971-07-26 | 1973-05-08 | H Cooper | Tube fins of outwardly-organized materials |
SE346370B (ko) * | 1971-09-03 | 1972-07-03 | Svenska Maskinverken Ab | |
AT341561B (de) * | 1972-04-14 | 1978-02-10 | Nyby Bruk Ab | Verwendung eines stahles fur die herstellung von langzeitig mit heisswasser in beruhrung stehenden gegenstanden |
JPS5760194A (en) * | 1980-09-27 | 1982-04-10 | Nippon Kentetsu Co Ltd | Fin tube |
JPS57153105A (en) * | 1981-03-18 | 1982-09-21 | Mitsubishi Heavy Ind Ltd | Mounting of anticorrosive stud |
JPS5965273U (ja) * | 1982-10-21 | 1984-05-01 | 前田 勉 | ボイラチユ−ブ |
JPS6066901U (ja) * | 1983-10-07 | 1985-05-13 | 三菱重工業株式会社 | 防食スタツド |
JPS61284530A (ja) * | 1985-06-12 | 1986-12-15 | Nippon Steel Corp | 加工性,接着性,耐蝕性に優れた鋼箔の製造法 |
US4714049A (en) * | 1986-10-08 | 1987-12-22 | Dorr-Oliver Incorporated | Apparatus to reduce or eliminate fluid bed tube erosion |
SE462002B (sv) * | 1988-09-09 | 1990-04-23 | Brava Patent & Invent Handelsb | Saett och anordning foer vaegning av i synnerhet svaart sjuka saengliggande patienter |
SE8803193L (sv) * | 1988-09-12 | 1990-03-13 | Gadelius Sunrod Ab | Vaermevaexlartub med ytfoerstorande element |
SE8803215D0 (sv) * | 1988-09-13 | 1988-09-13 | Gadelius Sunrod Ab | Ytforstoringselement for vermevexlartub |
JP2660577B2 (ja) * | 1989-06-09 | 1997-10-08 | エービービー株式会社 | 回転再生式熱交換装置用難燃性伝熱エレメント集積体 |
US5107798A (en) * | 1991-04-08 | 1992-04-28 | Sage Of America Co. | Composite studs, pulp mill recovery boiler including composite studs and method for protecting boiler tubes |
JPH05320753A (ja) * | 1992-05-21 | 1993-12-03 | Kawasaki Steel Corp | 高温強度の優れた炭素鋼の製造方法 |
-
1993
- 1993-12-14 DE DE59305979T patent/DE59305979D1/de not_active Expired - Fee Related
- 1993-12-14 EP EP93850231A patent/EP0658736B1/de not_active Expired - Lifetime
- 1993-12-14 ES ES93850231T patent/ES2101285T3/es not_active Expired - Lifetime
- 1993-12-14 DK DK93850231.7T patent/DK0658736T3/da active
-
1994
- 1994-12-08 NO NO944756A patent/NO303087B1/no unknown
- 1994-12-09 FI FI945801A patent/FI945801A/fi unknown
- 1994-12-13 PL PL94306258A patent/PL306258A1/xx unknown
- 1994-12-13 CN CN94119606A patent/CN1052065C/zh not_active Expired - Fee Related
- 1994-12-13 KR KR1019940033986A patent/KR100359141B1/ko not_active IP Right Cessation
- 1994-12-13 JP JP30894194A patent/JP3567000B2/ja not_active Expired - Lifetime
- 1994-12-13 US US08/355,072 patent/US5626187A/en not_active Expired - Fee Related
-
1997
- 1997-04-21 GR GR970400842T patent/GR3023182T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
NO303087B1 (no) | 1998-05-25 |
KR100359141B1 (ko) | 2003-02-11 |
EP0658736A1 (de) | 1995-06-21 |
PL306258A1 (en) | 1995-06-26 |
US5626187A (en) | 1997-05-06 |
CN1106918A (zh) | 1995-08-16 |
ES2101285T3 (es) | 1997-07-01 |
FI945801A (fi) | 1995-06-15 |
KR950019613A (ko) | 1995-07-24 |
NO944756D0 (no) | 1994-12-08 |
FI945801A0 (fi) | 1994-12-09 |
DK0658736T3 (da) | 1997-10-13 |
NO944756L (no) | 1995-06-15 |
CN1052065C (zh) | 2000-05-03 |
JP3567000B2 (ja) | 2004-09-15 |
JPH07253285A (ja) | 1995-10-03 |
DE59305979D1 (de) | 1997-04-30 |
GR3023182T3 (en) | 1997-07-30 |
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