CN1522351A - Steam generator heating surface comprising a multitude of approximately parallel heating tubes through which a cooling agent passes - Google Patents
Steam generator heating surface comprising a multitude of approximately parallel heating tubes through which a cooling agent passes Download PDFInfo
- Publication number
- CN1522351A CN1522351A CNA028133366A CN02813336A CN1522351A CN 1522351 A CN1522351 A CN 1522351A CN A028133366 A CNA028133366 A CN A028133366A CN 02813336 A CN02813336 A CN 02813336A CN 1522351 A CN1522351 A CN 1522351A
- Authority
- CN
- China
- Prior art keywords
- heating
- heating tube
- protective casing
- steam generator
- heating surface
- 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.)
- Granted
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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
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- 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
The invention relates to a heating surface of a steam generator comprising a multitude of approximately parallel heating tubes through which a cooling agent passes. Said heating tubes are arranged in the flow channel of the steam generator by means of mountings. The aim of the invention is to embody the heating surfaces of the steam generator in such a way as to prevent the continuous build-up of deposits in the form of slagging, and the disadvantages associated therewith, in the area through which the flue gases pass. To achieve this, the heating surface tubes are surrounded by protective sleeves which rest loosely on the surface of the heating surface tubes between the mountings thereof. The ends of the protective sleeves exhibit an expansion distance to the mountings of the heating surface tubes. The heat expansion coefficient of the material forming the protective sleeves is higher than that of the material forming the heating surface tubes.
Description
Technical field
The present invention relates to a kind of heating surface that has in a large number the steam generator of the heating tube that is distributed by roughly being parallel to each other of flowing through of cooling medium, heating tube is installed in the flow channel of steam generator by means of suspension arrangement.
Background technology
Has the heating surface that constitutes by tube bank on the combustion chamber or that be connected the back with the steam generator of the power plant of coal dust and other solid fuel ignitions and heating plant and fluidizing equipment and garbage incinerating system, they are by medium, as water or vapor stream mistake, so that absorb and export the heat of burnt fuel in the combustion chamber of steam generator.
The flue gas that forms when burning contains dust and cigarette ash.Because the high temperature that flue gas had surpasses cigarette ash fusing point (about 1000 °-1400 ℃) causes deposition and sintering on the heating surface in the combustion chamber near zone particularly, they are mainly become to be grouped into cigarette ash by sintering slag together.This deposition and sintering make to form so-called slag palpus on the pipe of heating surface along with the operation of steam generator increases.
Deposition and sintering cause in the combustion chamber heat exchange variation between the medium of the flue gas that flows and the quantity of heat given up in the pipe of heating surface on the one hand, the pipe of heating surface is subjected to very big heavy burden on the other hand, and this brings disadvantageous big load for the supporting structure of heating surface.Also there is such danger, promptly clinker arrive certain when big or small since its weight fall down from the pipe of heating surface, fall in the combustion chamber, and because damage for example appears in the equipment part of impact kinetic energy below being positioned at heating surface on funnel inclined-plane or the after-combustion fire bars.
The growth of slag sintering also brings the job security problem when burning office work when steam generator does not move.If the operating position is in the below in the heating surface zone that has very big slag sinter, in any case need get rid of slag in advance for the reason of labour protection so, but this brings very big expense again, for example adjusts equipment a long way off.
Remove the method for the slag sinter on the pipe of steam generator by the known a kind of usefulness of DE3819941A1, wherein make at least one tube vibration, particularly flexural vibrations, the slag deposits thing that adheres on the pipe is come off by means of a vibrator.By the vibration frequency of adjusting vibrator pipe is vibrated individually or in groups.
Here shortcoming is, not all zone can both fully be cleared up when the heating surface area is very big, because by multiple supporting vibration is interrupted.
In DE19630482A1, introduced a kind of heat exchanger, wherein be fixed in its wrapping range to the heat exchanger tube fixed-site, and the zone between the pitch of the laps and knock the pipe contact.The ballistic motion of knocking pipe here produces vibration equally in heat exchanger tube.Should reach coming off equally by the vibration that forms attached to the bits on the heat exchanger tube.
Here shortcoming is mechanical exciting device knocker, and it may cause the damage of heating tube, and cleaning effect is not so good when heating surface is very big.
Summary of the invention
Therefore the objective of the invention is, build the heating surface that designs steam generator in this wise, make the sedimental continuous increase of the heating surface slagging scorification form that prevents to be positioned at the flow of flue gas zone, and avoid the above-mentioned shortcoming of being correlated with therewith.
Realize by such method according to this purpose of the present invention; promptly the protected sleeve pipe of heating tube surrounds between its suspension arrangement; protective casing loosely is placed on the surface of heating tube; the end of protective casing has an expansion distance to the suspension arrangement of heating tube, and the material of protective casing is compared with the material of heating tube has bigger thermal coefficient of expansion.
Here axially to make manifold, especially two-part be favourable to protective casing, for example is mutually permanently connected by welding at the each several part of this protective casing.The thermal coefficient of expansion that the material coefficient of thermal expansion coefficient of protective casing cans be compared to tube material most is big 1.5 times; mostly to be most 1mm be favourable in gap between heating tube shell surface and the protective casing inner surface in addition; so that guarantee the expansion of protective casing, and prevent again that on the other hand dust from entering.
The slag that when steam generator moves, forms attached to heating tube on, especially especially near on those heating tubes of steam generator combustion chamber.That is to say first heating tube bundle and particularly be positioned at the slag sintering that the flow of flue gas path heating tube front, that flow through at first produces especially severe there, slag is anchored on the protective casing by loading onto protective casing around these heating tubes.
The present invention is based on such understanding; promptly compare and because the thermal coefficient of expansion of protective casing material coefficient of thermal expansion coefficient ratio tube material is big with the heating tube of medium (water, steam) cooling by flowing through it; protective casing is axially producing much bigger expansion when steam generator moves, and protective casing extends to the suspension arrangement direction.Therefore protective casing also cover heating tube when protective casing is installed as the unlapped zone of reserving from the expansion distance of the suspension arrangement of heating tube.
If now steam generator is out of service or along with the variations in temperature generation load variations of flue gas, just heating tube produces cleaning effect so, that is peeling off appears in the slag sintering on the protective casing.Protective casing is more much bigger than the contraction of heating tube when cooling off but, and this contraction of protective casing impels the slag sintering to peel off, thereby the heating surface that makes danger owing to the slag sintering be equipped with protective casing obtains cleaning.
Description of drawings
Should describe the present invention in detail with an embodiment below.Wherein accompanying drawing is represented:
The schematic, fragmentary side view of the heating tube bundle of two the overlapping settings of Fig. 1-in steam generator;
Fig. 2-heating tube is together with the diagrammatic side view of the protective casing of installing around heating tube;
Fig. 3-have schematic sectional view of the heating tube that is contained in the protective casing above it.
The specific embodiment
In the flow path of the flue gas 6 that when the heating surface of high pressure on the steam generator of burning brown coal powder and intermediate pressure superheater is suspended on brown coal powder in the steam generator internal combustion by means of a series of suspension arrangements 1 that are fixed on the steam generator lid, forms (Fig. 1).Brown coal powder is in about 30 meters height place is blown into the combustion chamber 2 of steam generator, and burning.Many mutual parallel heating tube bundles 3 side by side are fixed on the suspension arrangement 1 in the flow side end of the about 100 meters combustion chamber 2 of height.In these heating tube bundles 3 each is made of many heating tubes 4 that distribute that roughly are parallel to each other, and as the superheater surface of steam generator, the heating tube 4 of heating tube bundle 3 is provided with so here, and overlapped heating tube 4 is positioned on the vertical line.The whole overlapped heating tube 4 of one heating tube bundle 3 is also referred to as the pipe dish.
The heating tube bundle 3 that is arranged side by side abreast leaves about 1 meter fixed distance mutually on suspension arrangement 1.Middle cavity between each heating tube bundle 3 constitutes a slype.Above the superheater surface that constitutes by the heating tube bundle 3 that is arranged side by side mutually abreast, on suspension arrangement 1, fix the superheater surface that another is made of heating tube bundle 5.The heating tube 4 that also has above cigarette ash softening temperature (about 1000 ℃-1400 ℃) at the flue gas 6 that flows through from its next door is equipped with by protective casing 7 of the present invention.Here protective casing 7 is separately fixed between two suspension arrangements 1 of heating tube 4 (Fig. 2).This preferably carries out like this, and promptly protective casing 7 is made up of two semicanals that axially separate, and they are placed around heating tube 4, and interconnect by means of welding.Protective casing 7 is installed on the heating tube 4 center between two suspension arrangements 1.The end of protective casing 7 has an expansion distance 8 from adjacent suspension arrangement 1.
Here the exotic material of protective casing 7 is selected like this, makes it have the thermal coefficient of expansion more much higher than the material of heating tube 4.The internal diameter of protective casing 7 is equivalent to the external diameter of heating tube 4 basically, makes the inboard of protective casing 7 be fitted on the surface of heating tube 4 (Fig. 3).The about 0-1mm in slit that forms between heating tube 4 and protective casing 7 is big.Here the length of protective casing 7 is selected like this, makes the two ends of protective casing 7 have an expansion distance 8 respectively to suspension arrangement 1.When moving, steam boiler, makes heating tube almost completely protected sleeve covers between suspension arrangement respectively because thermal expansion makes protective casing to the suspension arrangement direction heating tube section that two ends are not capped when protective casing is installed that expands.The wall thickness of protective casing (about 3-5mm) is selected like this, the feasible heat transmission that hinders from flue gas to the medium that flows in heating tube only bigly.Play now that the slag sintering is deposited on the protective casing when steam generator moves, and grow up to certain size along with flowing through of high-temperature flue gas.
When big variation takes place in out of service or load at steam generator along with the cooling of the heating surface that causes thus since the protective casing material have bigger thermal coefficient of expansion it shunk more tempestuously than heating tube itself.The contraction of protective casing now impels the slag sintering to peel off from protective casing.Thereby the corresponding cleaning effect of steam generator heating surface appears.
In order to reduce the expense that protective casing is installed, the heating tube that also can only be defined as slag sintering especially severe when steam generator moves is equipped with protective casing.
Reach following advantage by the present invention:
1. in the continuous cleaning of operation and heating face out of service zone;
2. reduce in back out of service in the cleaning up cost aspect inspection preparation, evaluation and the repairing;
3. do not need the technique device that is used to clear up that adds, as knocking device, vibrator or the like;
4. reduce the thickness of heating tube upper caldding layer, thereby improve the heat transmission under the situation of considering protective casing.
The pictorial symbolization table
1 suspension arrangement, 2 combustion chambers, 3 heating tube bundles
4 heating tubes, 5 heating tube bundles, 6 flue gases
7 protective casings, 8 expansion distances
Claims (4)
1. have flow through in a large number by cooling medium, the be parallel to each other heating surface of steam generator of the heating tube that distributes roughly, heating tube is installed in the flow channel of steam generator by means of suspension arrangement, it is characterized by:
Heating tube (4) protected sleeve pipe (7) between its suspension arrangement (1) surrounds; protective casing loosely is placed on the surface of heating tube (4); the end of protective casing (7) has an expansion distance (8) from the suspension arrangement (1) of heating tube (4), and the material of protective casing (7) has bigger thermal coefficient of expansion with respect to the material of heating tube (4).
2. by the heating surface of claim 1, it is characterized by: protective casing (7) is made manifold vertically, and is especially two-part, and wherein the each several part of protective casing (7) is mutually permanently connected.
3. by the heating surface of claim 1 or 2, it is characterized by: the material of protective casing (7) is compared with the material of heating tube (4) has high at least 1.5 times thermal coefficient of expansion.
4. by one of claim 1 to 3 or several heating surface, it is characterized by: the gap between heating tube (4) shell surface and protective casing (7) inner surface is for 1mm is so big at the most.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2001131524 DE10131524B4 (en) | 2001-07-02 | 2001-07-02 | 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 |
| DE10131524.4 | 2001-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1522351A true CN1522351A (en) | 2004-08-18 |
| CN1231698C CN1231698C (en) | 2005-12-14 |
Family
ID=7689998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02813336 Expired - Fee Related CN1231698C (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 |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1402214A2 (en) |
| CN (1) | CN1231698C (en) |
| AU (1) | AU2002321138B9 (en) |
| DE (1) | DE10131524B4 (en) |
| WO (1) | WO2003004934A2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI122481B (en) * | 2004-12-29 | 2012-02-15 | Metso Power Oy | Superheater design |
| CN106196000B (en) * | 2016-08-30 | 2019-03-05 | 江苏汇能锅炉有限公司 | Low temperature vertical convection superheater for boiler |
| CN106196001B (en) * | 2016-08-30 | 2019-02-12 | 江苏汇能锅炉有限公司 | The vertical convection superheater of medium-pressure boiler |
Family Cites Families (8)
| 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 (en) * | 1932-11-27 | 1934-11-23 | Joachim Schade | Device for removing crusts in heat exchange apparatus and pipelines by means of elastic changes in shape |
| CH444188A (en) * | 1967-02-21 | 1967-09-30 | Sulzer Ag | Steam generator with panel-like heating surfaces arranged above the combustion chamber |
| DE3123060A1 (en) * | 1981-06-11 | 1983-01-13 | Erich 8139 Bernried Falke | Pipe for high temperatures |
| DE3819941A1 (en) * | 1988-06-11 | 1989-12-21 | Heinz Hilke | Method for cleaning the tubes in a steam generator, and device for carrying out the method |
| DE19630482A1 (en) * | 1996-07-27 | 1998-01-29 | Metallgesellschaft Ag | Heat exchanger |
| 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 |
-
2001
- 2001-07-02 DE DE2001131524 patent/DE10131524B4/en not_active Expired - Lifetime
-
2002
- 2002-06-27 EP EP02754786A patent/EP1402214A2/en active Pending
- 2002-06-27 WO PCT/EP2002/007144 patent/WO2003004934A2/en active IP Right Grant
- 2002-06-27 AU AU2002321138A patent/AU2002321138B9/en not_active Ceased
- 2002-06-27 CN CN 02813336 patent/CN1231698C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003004934A3 (en) | 2003-11-27 |
| AU2002321138B9 (en) | 2005-07-28 |
| DE10131524A1 (en) | 2003-01-23 |
| EP1402214A2 (en) | 2004-03-31 |
| WO2003004934A2 (en) | 2003-01-16 |
| AU2002321138B2 (en) | 2005-07-21 |
| CN1231698C (en) | 2005-12-14 |
| DE10131524B4 (en) | 2004-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051214 Termination date: 20140627 |
|
| EXPY | Termination of patent right or utility model |