EP2473783A2 - Dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec - Google Patents

Dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec

Info

Publication number
EP2473783A2
EP2473783A2 EP10768370A EP10768370A EP2473783A2 EP 2473783 A2 EP2473783 A2 EP 2473783A2 EP 10768370 A EP10768370 A EP 10768370A EP 10768370 A EP10768370 A EP 10768370A EP 2473783 A2 EP2473783 A2 EP 2473783A2
Authority
EP
European Patent Office
Prior art keywords
steam generator
forced
combustion chamber
walls
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
Application number
EP10768370A
Other languages
German (de)
English (en)
Other versions
EP2473783B1 (fr
Inventor
Thoralf Berndt
Qiurong Chen
Georg-Nikolaus Stamatelopoulos
Gerhard Weissinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GE Vernova GmbH
Original Assignee
Alstom Technology AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alstom Technology AG filed Critical Alstom Technology AG
Priority to SI201031236A priority Critical patent/SI2473783T1/sl
Publication of EP2473783A2 publication Critical patent/EP2473783A2/fr
Application granted granted Critical
Publication of EP2473783B1 publication Critical patent/EP2473783B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • F22B37/04—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler and characterised by material, e.g. use of special steel alloy
    • 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
    • F22B37/14—Supply mains, e.g. rising mains, down-comers, in connection with water tubes
    • F22B37/143—Panel shaped heating surfaces built up from tubes

Definitions

  • the invention relates to a forced once-through steam generator for the combustion of dry lignite without the aid of recirculated flue gas in the combustion chamber, the forced flow steam generator having a combustion chamber and a subsequent end of the upper flue and this surrounding Um chargedsleton, wherein the Um chargedsbuild are formed from tube walls whose tubes the working medium water / steam lead, the combustion chamber has at least one burner and are arranged in the flue gas Nachschaltsammlungdon.
  • Continuous flow or continuous flow steam generators are known from the publication "Kraftwerkstechnik", Springer-Verlag, 2nd edition 1994, Chapter 4.4.2.4-Zwang barnhopper (page 1 71 to 1 74), Prof. Dr.-Ing
  • a continuous flow or continuous flow steam generator the heating of the combustion chamber or the gas train forming pipe walls or enclosing walls - in contrast to a natural circulation or forced circulation steam generator with only partial evaporation of circulating water-steam mixture - to an evaporation of the flow or working medium in the tubes of the pipe walls or Um chargedsbin in a single pass.
  • a continuous flow steam generator fired with dry lignite (TBK) or a power plant designed therewith has a considerable efficiency increase potential compared to a forced flow steam generator conventionally fired with crude lignite (RBK) or a power plant formed therewith.
  • the TBK is generated in a process upstream of the combustion energetically favorable from RBK. Due to the reduced water content of the TBK compared to the RBK, the calorific value and the amount of heat to be transferred in the combustion chamber of the steam generator increases considerably.
  • the combustion chamber must be designed so that a final combustion chamber temperature in the range 950-1 150 ° C is established with the heat absorption of the surrounding walls of the combustion chamber.
  • the material T23 is listed, for example, in the VdTÜV material sheet 51 1/2, issue 06.2001 and the material T24 is listed, for example, in the standard sheet DIN EN 10216-2, October 2007 issue.
  • a flue gas recirculation system with a flue gas recirculation blower is necessary.
  • the convection heating surfaces used may be larger than if no flue gas recirculation is used.
  • the flue gas recirculation system and the additional heating surfaces represent high investment costs.
  • the flue gas recirculation system increases in a further disadvantageous way the electrical self-consumption of the power plant and increases the ongoing operating costs.
  • the heat absorption in the evaporator is not limited in a forced once-through steam generator, since the medium temperature at the evaporator outlet in forced continuous operation is already overheated and the amount of overheating can be set variably.
  • the associated temperature level of the steam or the associated calculation temperature in the enclosure walls is controlled by a suitable selection of materials and in the combustion of TBK by a suitable flue gas recirculation into the combustion chamber.
  • the object of the invention is therefore to provide a forced flow steam generator for the increase in price of dry brown coal, in which the aforementioned disadvantages are avoided or avoided in the cost of drying lignite the Einsharm a flue gas recirculation and the medium temperature in the Um Supersplinn or the pipe walls Compared to the raw lignite-fired forced-circulation steam generator is not increased.
  • the solution according to the invention provides a forced-circulation steam generator for the increase in price of dry lignite, which has the following advantages:
  • An advantageous embodiment provides that in the combustion chamber a part of the surrounding walls covering Schotten heating surface between the upper edge of the uppermost located burner and lower edge of the lowermost Nachschaltflowerization procedure is arranged.
  • At least part of the enclosing walls is formed from one of the materials T23, T24 or another material having a similar chemical composition.
  • at least the part of the surrounding walls is formed with the aforementioned materials, which is thermally highly loaded or higher than the remaining part of the surrounding walls.
  • the materials T23, T24 or another material with a similar chemical composition are high-quality materials which are commercially available and which meet the desired requirements or, after their welding, no heat post-treatment must be carried out on them.
  • An advantageous embodiment of the invention provides for the SchottenMap operation of martensitic materials with 9-12% chromium, austenitic materials or nickel-based alloys form or manufacture. This ensures that the requirements of the exposed in the combustion chamber Schottenflower Construction is satisfied in terms of temperatures.
  • the bulkhead heating surface is designed as a superheater or reheater heating surface.
  • the Schottenmos Design is efficient in integrated into the water / steam cycle of the forced flow steam generator or in the water / steam cycle of a power plant comprising such a forced flow steam generator.
  • An advantageous embodiment provides that the bulkhead heating surface is arranged parallel to the surrounding wall. This ensures that the Schottenmosization configuration as well as the surrounding wall is arranged vertically and provides a minimum possible attack surface for ash or slag from the combustion chamber.
  • An expedient embodiment provides that the bulkhead heating surface is arranged adjacent to the surrounding wall. This ensures that the enclosure wall is optimally covered by the bulkhead heating surface and that the lowest possible amount of heat reaches the enclosure wall.
  • FIG. 1 shows schematically a longitudinal section through a forced-circulation steam generator according to the invention
  • FIG. 2 as Figure 1, but alternative embodiment.
  • FIG. 1 schematically shows a continuous flow or forced circulation steam generator 1 (both designations mean the same thing, namely the generation of the steam within the steam generator in one pass) in a tower construction, ie the pipe walls 5 (as surrounding walls 4) and all secondary heating surfaces 7 are connected to resp housed in a single vertical throttle cable.
  • the vertical throttle cable which is formed or bounded by gas-tight enclosure walls 4, includes in its lower region
  • the combustion chamber 2 usually closes at the bottom with a combustion chamber funnel and extends up to the lowest Nachschaltflower Structure 7.
  • one or more burners 6 to increase the cost of Dry lignite arranged.
  • the burners 6 can be arranged either in the corners (corner burners) or in the walls (wall burners) of the combustion chamber 2.
  • the various Nachschaltsammlungvon 7 are arranged as Bermmungsflower lake. These are typically economizer heating surfaces, superheater and reheater heating surfaces.
  • the flue 3 closes up with a ceiling and he has at its upper end laterally a flue gas outlet 9.
  • the forced-circulation steam generator 1 has at least one sealing surface 8 which covers part of the surrounding walls 4 in the region of the combustion chamber 2 and whose area-side size is determined so that the heat absorption of the surrounding walls 4 and consequently their temperature is reduced to a value which reduces the Formation of the enclosing wall 4 made of modified, heat-resistant 2.25-2.5% chromium steels permits, which require no post heat treatment after their Sch dietechnischer processing.
  • the enclosing wall 4 in the region of the combustion chamber 2 with a predetermined surface-side size covering Schottenflower Design 8 takes from the combustion chamber 2 so much heat that the heat absorption of the perimeter wall 4 is reduced due to the cover such that the maximum medium temperature at the perimeter wall.
  • modified, heat-resistant 2.25-2.5% chromium steels which do not require post heat treatment after their welding processing.
  • These may be, for example, the materials T23 (a material approved by the American Society of Mechanical Engineers), T24 (7CrMoVTiB10-10) or another material of similar chemical composition covering steam temperatures up to about 500-510 ° C which are listed, for example, in the booklet "The T23 / T24 Book, New Grades for Waterwalls and Superheaters by Vallourec & Mannesmann Tubes" (booklet on modified, heat-resistant 2.25-2.5% chromium steels) in the enclosure wall 4 by means of the invention arranged Schotten heating surface 8 can on the use of Flue gas recirculation systems are dispensed with, the otherwise cooler flue gas lead into the combustion chamber 2 and thus lower the temperatures within the combustion chamber 2 and consequently the medium temperature in the enclosure wall 4.
  • these aforementioned high-grade materials which do not require any subsequent heat treatment after their welding processing, can be used either everywhere on the surrounding wall 4 or according to a commercially more advantageous variant, at least on the parts of the surrounding walls 4, whose high thermal load makes this necessary. These are, for example, the areas on the burners 6 and directly above the burner 6 within the combustion chamber 2. At the parts of the Um chargedssell 4, the thermal load is lower, such as in the lower part of the combustion chamber 2 (below the burner 6 including combustion chamber funnel) with medium temperatures of about ⁇ 400-460 ° C in the pipe walls, to reduce the investment costs in comparison to the aforementioned high quality materials lower valued materials, such as 16Mo3 or 1 3CrMo45. These materials also do not require post heat treatment after their welding processing.
  • the surrounding walls 4, which are formed as tube walls 5, are usually made of a welded pipe-web-tube combination, wherein the tubes of the tube walls 5, the working medium water / steam and within the enclosure walls 4 either obliquely or vertically or out a combination of oblique and vertical may be formed.
  • the arranged in the Um drawnstentn 4 tubes are used in the lower and middle part of the combustion chamber 2 as evaporator tubes, i. the fed and preheated water is evaporated in these evaporator tubes.
  • the tubes arranged in the surrounding wall 4 can already be switched as a superheater heating surface.
  • the Schotten heating surface 8 itself which now receives a portion of the heat from the combustion chamber 2 is formed according to the temperature requirements with suitable materials. Since very high temperatures are to be controlled, have for this martensitic 9- 1 2% chromium-containing steels, austenitic steels or nickel-based alloys have proven suitable.
  • the Schottenmositic materials T91 (X10CrMoVNb9-1), T92 (XI 0CrWMoVNb9-2) or VM1 2-SHC, the austenitic steels SUPER 304H, HR3C, DMV304HCu, DMV3101N or Ni-base alloys such as Alloy 61 7 (NiCr23Col 2Mo ) or Alloy 61 7mod (NiCr23Col 2Mo mod).
  • the Schottenterrorism Structure 8 may consist of individual, closely spaced and parallel tubes or a pipe-web-tube construction. The tubes of the Schottenflowering Structure 8 usually run horizontally within the heating surface, but can also extend vertically.
  • the Schottenflower Chemistry 8 is preferably arranged parallel to the Um chargedswand 4 and more preferably adjacent to the latter. By this arrangement it is ensured that the enclosure wall 4 is covered very efficiently by the Schottensammlung Structure 8 and thus the transfer of heat to the enclosure wall 4 is largely prevented. 2 shows an advantageous variant of the invention Schotten heating surface 8 is shown.
  • the enclosing wall 4 or pipe wall 5 which usually include the front and rear walls and two side walls of the forced once-through steam generator, in the combustion chamber 2 between the upper edge of the uppermost burner 6 and lower edge of the lowest Nachschaltsammlung Chemistry 7 (the range is in 2 with "S" designated or marked), partially covered by one or more Schottensammlung Operations (s) 8, wherein according to Figure 2 by way of example on each pipe wall a Schottensammlung reaction 8, that is a total of four, are arranged by the targeted arrangement of Scarf heating surface 8 Especially in this region of the combustion chamber 2, the generally hottest region of the surrounding wall 4 or pipe wall 5 can be covered within the combustion chamber 2.
  • the scarf heating surface 8 can advantageously be used as a superheater heating surface within the forced-circulation steam generator 1. However, it is possible also the use as a reheater heating surface. LIST OF REFERENCE NUMBERS

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Air Supply (AREA)

Abstract

La présente invention concerne un dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec sans avoir recours à des gaz de combustion réintroduits dans sa chambre de combustion, le dispositif de production de vapeur à circulation forcée (1) présentant une chambre de combustion (2) et une aspiration de gaz de combustion (3) qui se raccorde à son extrémité supérieure, ainsi que des parois périphériques (4) qui les entourent. Selon l'invention : les parois périphériques (4) se présentent sous la forme de parois tubulaires (5) dont les tubes mènent au milieu de travail eau/vapeur; la chambre de combustion (2) présente au moins un brûleur (6); l'aspiration de gaz de combustion (3) comprend des surfaces de chauffage aval (7); une partie des parois périphériques (4) est recouverte dans la zone de la chambre de combustion (2) par au moins une surface de chauffage de cloison étanche (8) dont la taille côté surface est définie de sorte que la quantité de chaleur reçue par les parois périphériques (4) et la température à la quelle elles sont portées en conséquence, sont réduites à une valeur qui permet la formation des parois périphériques (4) à partir d'aciers chromés à 2,25-2,5% modifiés résistants à la chaleur qui, après leur traitement par une technique de soudure, n'ont pas besoin de subir de post-traitement thermique.
EP10768370.8A 2009-09-04 2010-08-20 Dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec Not-in-force EP2473783B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201031236A SI2473783T1 (sl) 2009-09-04 2010-08-20 Generator pare s prisilnim tokom za sežig suhega rjavega premoga

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009040249A DE102009040249B4 (de) 2009-09-04 2009-09-04 Zwangdurchlaufdampferzeuger für die Verfeuerung von Trockenbraunkohle
PCT/DE2010/000982 WO2011026462A2 (fr) 2009-09-04 2010-08-20 Dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec

Publications (2)

Publication Number Publication Date
EP2473783A2 true EP2473783A2 (fr) 2012-07-11
EP2473783B1 EP2473783B1 (fr) 2016-04-20

Family

ID=43649691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10768370.8A Not-in-force EP2473783B1 (fr) 2009-09-04 2010-08-20 Dispositif de production de vapeur à circulation forcée pour la combustion de lignite sec

Country Status (10)

Country Link
US (1) US20120272929A1 (fr)
EP (1) EP2473783B1 (fr)
CN (1) CN102782405B (fr)
AU (1) AU2010291653B2 (fr)
DE (1) DE102009040249B4 (fr)
HU (1) HUE029835T2 (fr)
IN (1) IN2012DN02835A (fr)
PL (1) PL2473783T3 (fr)
SI (1) SI2473783T1 (fr)
WO (1) WO2011026462A2 (fr)

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US3125995A (en) * 1964-03-24 forced flow vapor generating unit
US2770030A (en) * 1950-06-15 1956-11-13 Babcock & Wilcox Co Welded joint between dissimilar metals
DE897706C (de) * 1950-11-04 1953-11-23 Babcock & Wilcox Dampfkessel W Dampferzeuger fuer hohe Dampftemperatur und hohe Luftvorwaermung
DE950670C (de) * 1951-05-17 1956-10-11 Babcock & Wilcox Dampfkessel W Aus gusseisernen Rohren bestehender feuergasbeheizter Rekuperativ-Lufterhitzer
US2960390A (en) * 1954-07-30 1960-11-15 Combustion Eng Superheater for chemical recovery unit
BE620763A (fr) * 1961-07-27
US3274977A (en) * 1964-11-12 1966-09-27 Combustion Eng Arrangement of a buckstay system for wide furnace steam generators
US3267908A (en) * 1965-08-03 1966-08-23 Sulzer Ag Steam generator with flue gas return
DE1576887A1 (de) * 1967-11-11 1970-05-27 Steinmueller Gmbh L & C Mit Zwanglauf betriebener Dampferzeuger
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US5308698A (en) * 1992-05-21 1994-05-03 Inco Alloys International, Inc. Flux for coated welding electrode
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WO2000042354A1 (fr) * 1999-01-13 2000-07-20 Abb Alstom Power Inc. Technique de lancement a cycle multimodal dans un systeme de fourniture d'energie a cycle kalina
DE10039317A1 (de) * 2000-08-11 2002-04-11 Alstom Power Boiler Gmbh Dampferzeugeranlage
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US7028882B2 (en) * 2004-02-02 2006-04-18 General Electric Company Process and apparatus for boiler tube panel welding and straightening
US6957630B1 (en) * 2005-03-31 2005-10-25 Alstom Technology Ltd Flexible assembly of once-through evaporation for horizontal heat recovery steam generator
DE102008037085B3 (de) * 2008-08-08 2009-08-06 Alstom Technology Ltd. Verfahren zur Herstellung von Dampferzeuger-Rohrwänden bestehend aus überwiegend 9-12% chromhaltigen, martensitischen Stählen

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Also Published As

Publication number Publication date
US20120272929A1 (en) 2012-11-01
HUE029835T2 (en) 2017-04-28
WO2011026462A2 (fr) 2011-03-10
EP2473783B1 (fr) 2016-04-20
PL2473783T3 (pl) 2016-12-30
IN2012DN02835A (fr) 2015-07-24
AU2010291653B2 (en) 2016-03-17
AU2010291653A1 (en) 2012-04-12
WO2011026462A3 (fr) 2012-08-16
DE102009040249B4 (de) 2011-12-08
CN102782405B (zh) 2016-01-13
CN102782405A (zh) 2012-11-14
SI2473783T1 (sl) 2016-08-31
DE102009040249A1 (de) 2011-09-08
WO2011026462A8 (fr) 2012-04-05

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