WO2010029100A2 - Durchlaufdampferzeuger - Google Patents
Durchlaufdampferzeuger Download PDFInfo
- Publication number
- WO2010029100A2 WO2010029100A2 PCT/EP2009/061677 EP2009061677W WO2010029100A2 WO 2010029100 A2 WO2010029100 A2 WO 2010029100A2 EP 2009061677 W EP2009061677 W EP 2009061677W WO 2010029100 A2 WO2010029100 A2 WO 2010029100A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tubes
- steam generator
- gas
- combustion chamber
- water
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B29/00—Steam boilers of forced-flow type
- F22B29/06—Steam boilers of forced-flow type of once-through type, i.e. built-up from tubes receiving water at one end and delivering superheated steam at the other end of the tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B21/00—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically
- F22B21/34—Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically built-up from water tubes grouped in panel form surrounding the combustion chamber, i.e. radiation boilers
- F22B21/341—Vertical radiation boilers with combustion in the lower part
-
- 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
- F22B37/26—Steam-separating arrangements
Definitions
- the invention relates to a continuous steam generator with a combustion chamber with a number of burners for fossil fuel, the heating gas side in a top region via a horizontal gas is followed by a vertical gas train, wherein the peripheral wall of the combustion chamber of gas-tight welded together, a Wasserabscheidesystem strömungsmediums- side upstream evaporator tubes and
- the Wasserabscheidesystem comprises a number of Wasserabscheide instituten, each of the Wasserabscheideimplantation comprises a connected to the respective upstream evaporator tubes Einströmrohr mosaic, seen in its longitudinal direction merges into a Wasserableitrohr voting, wherein in the transition area a number of Abströmrohr structurien branches, which with an inlet header of the respective downstream superheater Ro are connected.
- a fossil-fueled steam generator the energy of a fossil fuel is used to generate superheated steam, which can then be supplied to power a steam turbine, for example, in a power plant.
- Steam generators are usually designed as water tube boilers, in particular in the steam temperatures and pressures customary in a power plant environment, that is to say the supplied water flows in a number of pipes, which flow through the steam
- the steam generator tubes usually form the combustion chamber wall by being welded together in gas-tight fashion.
- the combustion chamber Smoke gas side downstream areas can also be provided in the exhaust duct arranged Dampfmaschineerrohe.
- Fossil fueled steam generators can be categorized by a variety of criteria: based on the flow direction of the gas flow, steam generators can be classified, for example, into vertical and horizontal types. In fossil-fueled steam generators in vertical construction usually single-pass and two-pass boilers are differentiated.
- the flue gas produced by the combustion in the combustion chamber always flows vertically from bottom to top. All arranged in the flue gas heating surfaces are flue gas side above the combustion chamber. Tower boilers offer a comparatively simple construction and easy control of the stresses caused by the thermal expansion of the tubes. Furthermore, all heating surfaces of the steam generator tube arranged in the flue gas duct are horizontal and therefore completely drainable, which may be desirable in frost-prone environments.
- a horizontal gas flue is connected downstream of the flue gas side in an upper region of the combustion chamber, which flows into a vertical gas flue.
- the gas usually flows vertically from top to bottom. It takes place at the two-pass boiler so a multiple deflection of the flue gas. Advantages of this design are, for example, the lower overall height and the resulting lower production costs.
- Steam generators may continue to be designed as a natural circulation, forced circulation or continuous steam generator.
- a continuous steam generator the heating of a number of evaporator tubes leads to complete evaporation of the flow medium in the evaporator tubes in one pass.
- the flow medium - usually water - is after its evaporation to the evaporator tubes downstream superheater supplied tubes and overheated there.
- the position of the evaporation end point, ie the location at which the water content of the flow is completely evaporated, is variable and mode-dependent.
- the evaporation end point is, for example, in an end region of the evaporator tubes, so that the overheating of the vaporized flow medium already begins in the evaporator tubes (with the nomenclature used, this description is strictly valid only for partial loads with subcritical pressure in the evaporator However, for the sake of clarity, this illustration will be used throughout the following description).
- a continuous steam generator In contrast to a natural or forced circulation steam generator, a continuous steam generator is not subject to any pressure limitation, so that it can reach steam pressures far above the critical pressure of water (P K ⁇ ⁇ 221 bar) - where water and steam can not occur simultaneously at any temperature and therefore no phase separation is possible - can be designed.
- such a continuous steam generator is usually operated with a minimum flow of flow medium in the evaporator tubes in order to ensure reliable cooling of the evaporator tubes.
- the pure mass flow through the evaporator usually no longer suffices for cooling the evaporator tubes, so that an additional throughput of flow medium is superimposed on the passage of flow medium through the evaporator in circulation.
- the operationally provided minimum flow of flow medium in the evaporator tubes is thus not completely evaporated during startup or during low load operation in the evaporator tubes, so that in such a mode at the end of the evaporator tubes still unvaporized flow medium, in particular a water-steam mixture is present.
- the evaporator tubes of the continuous steam generator are usually designed for a flow through unvaporised flow medium after flowing through the combustion chamber walls, continuous steam generators are usually designed so that even when starting and in low load operation, water ingress into the superheater tubes is reliably avoided.
- the evaporator tubes are usually connected to the superheater tubes connected downstream via a water separation system.
- the water separator causes a separation of the emerging during the start or in low load operation of the evaporator tubes water-steam mixture in water and in steam.
- the steam is supplied to the water separator downstream superheater tubes, whereas the separated water can be fed back to the evaporator tubes, for example via a circulating pump or discharged through a decompressor.
- the water separation system can comprise a multiplicity of water separation elements which are integrated directly into the pipes.
- each of the parallel-connected evaporator tubes may be assigned a Wasserabscheideelement.
- the Wasserabscheideetic can continue to be designed as a so-called T-piece Wasserabscheideetic.
- each T-piece water separation element in each case comprises an inlet pipe piece connected to the upstream evaporator pipe, which, viewed in its longitudinal direction, merges into a water drainage pipe piece, wherein a discharge pipe piece connected to the downstream superheater pipe branches off in the transition region.
- the T-piece Wasserabscheideelement for inertial separation of the flowing from the upstream evaporator tube in the Einströmrohr Anlagen water-steam mixture is designed. Because of its comparatively higher inertia, the water content of the flow medium flowing in the inflow pipe section flows at the transition point preferably in the axial extension of the inflow pipe. Piece continues and thus enters the Wasserableitrohr Gi and from there usually further into a connected collecting container. By contrast, the vapor content of the water / steam mixture flowing in the inflow pipe section can better follow an imposed deflection because of its comparatively lower inertia and thus flows via the outflow pipe piece to the downstream superheater pipe section.
- a continuous steam generator of this type is known for example from EP 1 701 091.
- a distributor element being arranged on the steam side between the respective water separation element and the inlet collector.
- the invention is based on the consideration that the decentralized separation of water, which takes place separately in each of the parallel-connected evaporator tubes in the construction described above, a comparatively large number of T-piece Wasserabscheideijnn can lead to design problems in large-scale application. Due to the space problems that may be associated with the necessity of accommodating such a large number of water separation elements, such a construction can also entail significant additional costs and limitations of the continuous flow steam generator due to the high design effort involved.
- Wasserabscheidesystems be achieved.
- the number of Wasserabscheideieri used can be reduced.
- the basic design in the form of T-piece water separation elements should be maintained.
- the combination of the two aforementioned concepts can be achieved by a collection of the flow medium from a plurality of evaporator tubes in each case a Wasserabscheideelement.
- a distributor element is arranged on the steam side between the respective water separation element and the inlet header.
- the geometric parameters of a number of outlet pipes are chosen such that a homogeneous flow distribution is ensured on the inlet header of the respectively downstream superheater pipes.
- a homogeneous entry is already achieved in the inlet header, which continues accordingly in the downstream superheater tubes.
- the outlet tubes can, for example, have the same diameter and be guided at equal intervals parallel to one another in the inlet header.
- the distributor element is designed as a star distributor, d. H. it comprises a baffle plate, an inlet tube arranged perpendicular to the baffle plate, and a number of outlet tubes arranged in a star shape around the baffle plate in the plane thereof.
- the inflowing water impinges on the baffle plate and is distributed in a symmetrical manner perpendicular to the inflow direction and directed into the outlet tubes.
- the baffle plate in a particularly advantageous embodiment is circular and the exit tubes arranged concentrically to the center of the baffle plate at equal intervals to the respective adjacent outlet tubes. In this way, a particularly homogeneous distribution is ensured on the different outlet pipes.
- the advantages achieved by the invention are in particular that a uniform distribution of the flow medium is achieved on the superheater tubes by the vapor-side arrangement of an additional distribution element between the respective Wasserabscheideelement and the inlet header of the superheater heating even at a much lower number of Wasserabscheideimplantationn.
- These measures make it possible to reduce the number of water separation elements in the first place. This means a considerably lower production outlay and a comparatively lower complexity of the pipe system of the continuous-flow steam generator, and a particularly high operational flexibility can also be achieved in start-up or low-load operation.
- FIG. 1 shows a continuous steam generator in Zweizugbauweise in a schematic Dar- position.
- the continuous-flow steam generator 1 comprises a combustion chamber 2 designed as a vertical gas flue, which is located in an overhead ren region 4 a horizontal gas train 6 is connected downstream. At the horizontal gas train 6, another vertical gas train 8 connects.
- a number not shown burner is provided which burn a liquid or solid fuel in the combustion chamber.
- the surrounding wall 12 of the combustion chamber 2 is formed from steam generator tubes which are welded together in a gastight manner and into which a flow medium, usually water, is pumped in by a pump (not shown in greater detail), which is heated by the heat generated by the burners.
- the steam generator tubes can be aligned either spirally or vertically. Due to differences both in the geometry of the individual tubes and in their heating, different mass flows and temperatures of the flow medium (imbalances) in parallel tubes set. In a helical arrangement, a comparatively higher design effort is required, but the resulting imbalances between parallel connected pipes are comparatively lower than in the case of a perpendicularly annealed combustion chamber 2.
- the continuous steam generator 1 shown further comprises, to improve the flue gas duct, a nose 14, which merges directly into the bottom 16 of the horizontal gas flue 6 and projects into the combustion chamber 2. Furthermore, a grid 18 is arranged from further superheater tubes in the transition region from the combustion chamber 2 to the horizontal gas flue 6 in the flue gas duct.
- the steam generator tubes in the lower part 10 of the combustion chamber 2 are designed as evaporator tubes.
- the flow medium is first evaporated in them and fed via outlet collector 20 to the water separation system 22.
- Wasserabscheidesystem 22 not yet evaporated water is collected and removed. This is especially necessary during start-up operation if a larger amount of flow medium has to be pumped in for safe cooling of the evaporator tubes than in a Steam tube run can be evaporated.
- the generated steam is conducted into the walls of the combustion chamber 2 in the upper region 4 and optionally distributed to the arranged in the walls of the horizontal gas flue 6 superheater tubes.
- the water separation system 22 comprises a number of T-piece Wasserabscheide 1952. Each number of evaporator tubes opens via an outlet header 20 in a common transition pipe piece 26, each of which a T-piece Wasserabscheideelement 24 is connected downstream.
- the T-piece Wasserabscheideelement 24 includes an inflow pipe section 28, which, viewed in its longitudinal direction merges into a Wasserableitrohr Gi 30, wherein a Abströmrohr- piece 32 branches off in the transition region.
- the Wasserableitrohr consensus 30 opens into a collector 34. To the collector 34 is connected via connecting lines 35, a collecting container 36 (bottle) downstream. To the collecting container 36, an outlet valve 38 is connected, via which the separated water can either be discarded or re-fed to the evaporation circuit.
- the outlet valve 38 can be closed and thus an overfeed of the T-piece Wasserabscheideieri 24 brought about.
- still unevaporated water enters the superheater tubes, so that they can still be used for further evaporation, d. h.,
- the evaporation end point can be moved into the superheater tubes, which allows a relatively higher flexibility in the operation of the continuous steam generator 1.
- T-piece water separator elements 24 In order to allow a particularly simple construction of the continuous steam generator 1, a comparatively smaller number of T-piece water separator elements 24 should be used. In order to compensate for the resulting inhomogeneities in terms of distribution to the superheater tubes and thus to allow such a configuration in the first place, the T-piece Wasserabscheideijnn 24 distributor elements 42 are interposed in the manner of star distributors. These provide for a pre-distribution of the flow medium in the event of over-feeding of the T-piece Wasserabscheideimplantation 24 on the inlet header 40th
- the flow medium strikes a circular baffle plate and bounces from there into star-shaped, concentrically-symmetrically arranged outlet tubes 44.
- the symmetrical arrangement allocates approximately the same amount of flow medium to each outlet tube 44.
- the flow medium in the inlet collectors 40 would not be the same. can be distributed moderately, since these are not suitable due to their width for such a homogeneous distribution of, for example, a single supply line.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200980126382XA CN102089583B (zh) | 2008-09-09 | 2009-09-09 | 连续蒸汽发生器 |
US13/062,700 US9267678B2 (en) | 2008-09-09 | 2009-09-09 | Continuous steam generator |
EP09782807.3A EP2321578B1 (de) | 2008-09-09 | 2009-09-09 | Durchlaufdampferzeuger |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08015862A EP2180250A1 (de) | 2008-09-09 | 2008-09-09 | Durchlaufdampferzeuger |
EP08015862.9 | 2008-09-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010029100A2 true WO2010029100A2 (de) | 2010-03-18 |
WO2010029100A3 WO2010029100A3 (de) | 2010-05-14 |
Family
ID=41796588
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/061677 WO2010029100A2 (de) | 2008-09-09 | 2009-09-09 | Durchlaufdampferzeuger |
Country Status (5)
Country | Link |
---|---|
US (1) | US9267678B2 (de) |
EP (2) | EP2180250A1 (de) |
CN (1) | CN102089583B (de) |
RU (1) | RU2011113816A (de) |
WO (1) | WO2010029100A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012028502A3 (de) * | 2010-09-03 | 2012-06-28 | Siemens Aktiengesellschaft | Solarthermischer durchlaufdampferzeuger mit einem dampfabscheider und nachgeschaltetem sternverteiler für solarturm-kraftwerke mit direkter verdampfung |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2182278A1 (de) * | 2008-09-09 | 2010-05-05 | Siemens Aktiengesellschaft | Durchlaufdampferzeuger |
EP2180251A1 (de) * | 2008-09-09 | 2010-04-28 | Siemens Aktiengesellschaft | Durchlaufdampferzeuger |
EP2213936A1 (de) * | 2008-11-10 | 2010-08-04 | Siemens Aktiengesellschaft | Durchlaufdampferzeuger |
DE102013215457A1 (de) * | 2013-08-06 | 2015-02-12 | Siemens Aktiengesellschaft | Durchlaufdampferzeuger in Zweizugkesselbauweise |
CN104048105A (zh) * | 2014-05-29 | 2014-09-17 | 中国五冶集团有限公司 | 用于300m2烧结低温余热发电系统中的低压管道安装工艺 |
US9920924B2 (en) * | 2016-04-05 | 2018-03-20 | The Babcock & Wilcox Company | High temperature sub-critical boiler with steam cooled upper furnace and start-up methods |
CN113375139B (zh) * | 2021-07-16 | 2024-08-23 | 亿斯德特种智能装备(大连)有限公司 | 瓦斯低氮燃烧生产蒸汽的装置 |
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-
2008
- 2008-09-09 EP EP08015862A patent/EP2180250A1/de not_active Withdrawn
-
2009
- 2009-09-09 RU RU2011113816/06A patent/RU2011113816A/ru not_active Application Discontinuation
- 2009-09-09 US US13/062,700 patent/US9267678B2/en not_active Expired - Fee Related
- 2009-09-09 CN CN200980126382XA patent/CN102089583B/zh not_active Expired - Fee Related
- 2009-09-09 WO PCT/EP2009/061677 patent/WO2010029100A2/de active Application Filing
- 2009-09-09 EP EP09782807.3A patent/EP2321578B1/de active Active
Patent Citations (5)
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US3021824A (en) * | 1956-11-22 | 1962-02-20 | Sulzer Ag | Forced flow steam generating plant |
GB893371A (en) * | 1957-07-16 | 1962-04-11 | Babcock & Wilcox Ltd | Improvements in vapour generating and heating units and an improved method of generating and heating vapour |
GB2015129A (en) * | 1978-02-17 | 1979-09-05 | Kraftwerk Union Ag | Water Tube Steam Generators |
EP1701091A1 (de) * | 2005-02-16 | 2006-09-13 | Siemens Aktiengesellschaft | Durchlaufdampferzeuger |
EP1710498A1 (de) * | 2005-04-05 | 2006-10-11 | Siemens Aktiengesellschaft | Dampferzeuger |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012028502A3 (de) * | 2010-09-03 | 2012-06-28 | Siemens Aktiengesellschaft | Solarthermischer durchlaufdampferzeuger mit einem dampfabscheider und nachgeschaltetem sternverteiler für solarturm-kraftwerke mit direkter verdampfung |
Also Published As
Publication number | Publication date |
---|---|
RU2011113816A (ru) | 2012-10-20 |
WO2010029100A3 (de) | 2010-05-14 |
CN102089583B (zh) | 2013-04-10 |
US20110197830A1 (en) | 2011-08-18 |
EP2321578B1 (de) | 2016-11-02 |
EP2321578A2 (de) | 2011-05-18 |
US9267678B2 (en) | 2016-02-23 |
EP2180250A1 (de) | 2010-04-28 |
CN102089583A (zh) | 2011-06-08 |
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