WO2003004934A2 - Heizfläche eines dampferzeugers mit zahlreichen, von einem kühlmedium durchströmten, etwa parallel zueinander verlaufenden heizflächenrohren - Google Patents
Heizfläche eines dampferzeugers mit zahlreichen, von einem kühlmedium durchströmten, etwa parallel zueinander verlaufenden heizflächenrohren Download PDFInfo
- Publication number
- WO2003004934A2 WO2003004934A2 PCT/EP2002/007144 EP0207144W WO03004934A2 WO 2003004934 A2 WO2003004934 A2 WO 2003004934A2 EP 0207144 W EP0207144 W EP 0207144W WO 03004934 A2 WO03004934 A2 WO 03004934A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heating surface
- heating
- tubes
- steam generator
- protective sleeves
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G5/00—Cleaning by distortion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/10—Water tubes; Accessories therefor
- F22B37/107—Protection of water tubes
Definitions
- the invention relates to a heating surface of a steam generator with numerous heating surface tubes through which a cooling medium flows and which run approximately parallel to one another and which are arranged in the flow channel of the steam generator by means of suspensions.
- the flue gases that are produced during combustion are loaded with dust and ash. Due to the high temperature of the flue gases (approx. 1000 - 1400 ° C), which is above the melting point of the ash, deposits and caking occur, particularly on heating surfaces in the area near the combustion chamber, which are mainly composed of sintered slag and ash components put together.
- the mechanical excitation means knockers which can lead to damage to the heating surface tubes, and the inadequate cleaning action in the case of very large heating surface expansions are disadvantageous here.
- the object of the invention to propose to design heating surfaces of steam generators in such a way that a constant growth of the deposits in the form of slagging of the heating surfaces located in the flow area of the flue gases is prevented and the above-mentioned disadvantages are avoided.
- the object is achieved in that the heating flat tubes are surrounded by protective sleeves between their suspensions, which lie loosely on the surface of the heating flat tubes, the ends of the protective sleeves have an expansion distance from the suspensions of the heating flat tubes and the material of the protective sleeves compared to the material of the heating flat tubes has higher coefficients of thermal expansion.
- the protective sleeves axially in several parts, preferably in two parts.
- the parts of the protective sleeve are z. B. firmly connected by welding.
- the coefficient of thermal expansion of the material of the protective sleeves should advantageously be 1.5 times higher than the coefficient of heat of the material of the heating flat tubes. It also makes sense to measure the gap between the outer surface of the heating surface tubes and the inner surface of the protective sleeve with up to 1 mm in order to ensure that the protective sleeve expands and, on the other hand, to prevent dust from penetrating.
- the slag that forms on the heating surface tubes when the steam generator is in operation adheres above all to those heating surface tubes that are particularly close to the combustion chamber of the steam generator.
- the first heating surface tube bundle, and in particular the heating surface tubes lying at the front in the flow path of the flue gases are particularly badly affected by slag caking.
- the invention is based on the knowledge that compared to the heating surface tubes, which are cooled by a medium flowing through them (water, steam) and due to the higher coefficient of thermal expansion of the material of the protective sleeves compared to the material of the heating surface tubes, the protective sleeves during operation of the steam generator are much more efficient experienced greater expansion in the axial direction.
- the protective sleeves expand in the direction of the suspensions.
- the protective sleeves also cover the area of the heating flat tubes, which remains uncovered as an expansion distance to the suspensions of the heating flat tubes when the protective sleeves are installed.
- the cleaning effect of the flat heating pipes, ie the flaking off of the slag cakes on the protective sleeves now occurs when the steam generator is taken out of operation or load changes occur with temperature changes of the flue gases.
- the protective sleeves contract significantly more when cooling than the flat heating pipes. This contraction of the protective sleeve causes the slag cakes to flake off and thus the heating surfaces, which have been provided with the protective sleeves due to the risk of slag caking, to be cleaned off.
- Fig. 1 - a schematic section of a side view of two superimposed heating surface tube bundles in a steam generator
- Fig. 2 - a schematic side view of a heating surface tube with a protective sleeve mounted around the heating surface tube
- Fig. 3 - a schematic section through a heating surface tube with a mounted protective sleeve
- the heating surfaces of the high-pressure and intermediate-pressure superheaters are suspended from a lignite-dust-fired steam generator by means of a series of suspensions 1 fastened to the ceiling of the steam generator in the flow path of the flue gases 6 which are generated in the steam generator during combustion of the lignite dust (FIG. 1).
- the lignite dust is blown into the combustion chamber 2 of the steam generator at a height of approximately 30 m and burned.
- a plurality of heating surface tube bundles 3 are fastened in parallel to the suspensions 1.
- Each of these heating surface tube bundles 3 is formed from a plurality of heating surface tubes 4 running approximately parallel to one another and represents a superheater heating surface of the steam generator.
- the heating surface tubes 4 of the heating surface tube bundles 3 are arranged in such a way that the heating surface tubes 4 lying one above the other are in a vertical alignment. All superimposed heating surface tubes 4 of a heating surface tube bundle 3 are also referred to as tube disks.
- the parallel heating surface tube bundles 3 are attached to the suspensions 1 at a distance of approximately 1 m from one another. The space between the individual heating surface tube bundles 3 forms an alley.
- the ends of the protective sleeves 7 have an expansion distance 8 from the adjacent suspensions 1.
- the high temperature resistant material of the protective sleeves 7 is selected so that it has a much higher coefficient of thermal expansion (1.5 times) than the material of the heating surface tube 4.
- the inner diameter of the protective sleeve 7 corresponds essentially to the outer diameter of the heating surface tube 4, so that the inside of the protective sleeve 7 rests on the surface of the heating surface tube 4 (Fig. 3).
- the gap formed between the heating surface tube 4 and the protective sleeve 7 is approximately 0-1 mm in size.
- the length of the protective sleeve 7 is chosen so that the two ends of the protective sleeve 7 are each at an expansion distance 8 from the suspensions 1.
- the protective sleeve expands in the direction of the suspensions during operation of the steam boiler due to the thermal expansion, so that the heating surface tube between the suspensions is almost completely covered with the protective sleeve.
- the wall thickness of the protective sleeve (approx. 3 - 5 mm) is selected so that the heat transfer from the flue gas to the medium flowing in the heating surface tubes is not excessively impeded.
- the heating flat tubes can be equipped with the protective sleeves, on which particularly strong slag caking was found during the operation of the steam generator.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Incineration Of Waste (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Catching Or Destruction (AREA)
- Financial Or Insurance-Related Operations Such As Payment And Settlement (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002321138A AU2002321138B9 (en) | 2001-07-02 | 2002-06-27 | Steam generator heating surface comprising a multitude of approximately parallel heating tubes through which a cooling agent passes |
EP02754786A EP1402214A2 (de) | 2001-07-02 | 2002-06-27 | Heizfläche eines dampferzeugers mit zahlreichen, von einem kühlmedium durchströmten, etwa parallel zueinander verlaufenden heizflächenrohren |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2001131524 DE10131524B4 (de) | 2001-07-02 | 2001-07-02 | Heizfläche eines Dampferzeugers mit zahlreichen, von einem Kühlmedium durchströmten, etwa parallel zueinander verlaufenden Heizflächenrohren |
DE10131524.4 | 2001-07-02 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003004934A2 true WO2003004934A2 (de) | 2003-01-16 |
WO2003004934A3 WO2003004934A3 (de) | 2003-11-27 |
Family
ID=7689998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/007144 WO2003004934A2 (de) | 2001-07-02 | 2002-06-27 | Heizfläche eines dampferzeugers mit zahlreichen, von einem kühlmedium durchströmten, etwa parallel zueinander verlaufenden heizflächenrohren |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1402214A2 (de) |
CN (1) | CN1231698C (de) |
AU (1) | AU2002321138B9 (de) |
DE (1) | DE10131524B4 (de) |
WO (1) | WO2003004934A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI122481B (fi) * | 2004-12-29 | 2012-02-15 | Metso Power Oy | Tulistimen rakenne |
CN106196000B (zh) * | 2016-08-30 | 2019-03-05 | 江苏汇能锅炉有限公司 | 用于锅炉的低温立式对流式过热器 |
CN106196001B (zh) * | 2016-08-30 | 2019-02-12 | 江苏汇能锅炉有限公司 | 中压锅炉用立式对流式过热器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB278811A (en) * | 1926-07-16 | 1927-10-17 | Henry Pelham Smith | Improvements in or relating to water tube boilers |
US1969003A (en) * | 1931-11-06 | 1934-08-07 | Superheater Co Ltd | Coating |
DE606028C (de) * | 1932-11-27 | 1934-11-23 | Joachim Schade | Einrichtung zum Beseitigen von Krusten in Waermeaustauschapparaten und Rohrleitungen durch elastische Formaenderungen |
CH444188A (de) * | 1967-02-21 | 1967-09-30 | Sulzer Ag | Dampferzeuger mit über der Brennkammer angeordneten tafelartigen Heizflächen |
US6152087A (en) * | 1996-12-12 | 2000-11-28 | Ngk Insulators, Ltd. | Boiler tube protector and a method for attaching such protector to a boiler tube |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3123060A1 (de) * | 1981-06-11 | 1983-01-13 | Erich 8139 Bernried Falke | Rohre fuer hohe temperaturen |
DE3819941A1 (de) * | 1988-06-11 | 1989-12-21 | Heinz Hilke | Verfahren zum abreinigen der rohre in einem dampferzeuger und vorrichtung zur durchfuehrung des verfahrens |
DE19630482A1 (de) * | 1996-07-27 | 1998-01-29 | Metallgesellschaft Ag | Wärmeaustauscher |
-
2001
- 2001-07-02 DE DE2001131524 patent/DE10131524B4/de not_active Expired - Lifetime
-
2002
- 2002-06-27 EP EP02754786A patent/EP1402214A2/de active Pending
- 2002-06-27 WO PCT/EP2002/007144 patent/WO2003004934A2/de active IP Right Grant
- 2002-06-27 AU AU2002321138A patent/AU2002321138B9/en not_active Ceased
- 2002-06-27 CN CN 02813336 patent/CN1231698C/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB278811A (en) * | 1926-07-16 | 1927-10-17 | Henry Pelham Smith | Improvements in or relating to water tube boilers |
US1969003A (en) * | 1931-11-06 | 1934-08-07 | Superheater Co Ltd | Coating |
DE606028C (de) * | 1932-11-27 | 1934-11-23 | Joachim Schade | Einrichtung zum Beseitigen von Krusten in Waermeaustauschapparaten und Rohrleitungen durch elastische Formaenderungen |
CH444188A (de) * | 1967-02-21 | 1967-09-30 | Sulzer Ag | Dampferzeuger mit über der Brennkammer angeordneten tafelartigen Heizflächen |
US6152087A (en) * | 1996-12-12 | 2000-11-28 | Ngk Insulators, Ltd. | Boiler tube protector and a method for attaching such protector to a boiler tube |
Also Published As
Publication number | Publication date |
---|---|
WO2003004934A3 (de) | 2003-11-27 |
AU2002321138B9 (en) | 2005-07-28 |
DE10131524A1 (de) | 2003-01-23 |
CN1522351A (zh) | 2004-08-18 |
EP1402214A2 (de) | 2004-03-31 |
AU2002321138B2 (en) | 2005-07-21 |
CN1231698C (zh) | 2005-12-14 |
DE10131524B4 (de) | 2004-04-15 |
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