US20120272929A1 - Once-through steam generator for burning dry brown coal - Google Patents

Once-through steam generator for burning dry brown coal Download PDF

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Publication number
US20120272929A1
US20120272929A1 US13/393,650 US201013393650A US2012272929A1 US 20120272929 A1 US20120272929 A1 US 20120272929A1 US 201013393650 A US201013393650 A US 201013393650A US 2012272929 A1 US2012272929 A1 US 2012272929A1
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US
United States
Prior art keywords
steam generator
combustion chamber
once
heating surface
walls
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.)
Abandoned
Application number
US13/393,650
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English (en)
Inventor
Thoralf Berndt
Qiurong Chen
Georg-Nikolaus Stamatelopoulos
Gerhard Weissinger
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General Electric Technology GmbH
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Individual
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Filing date
Publication date
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Assigned to ALSTOM TECHNOLOGY LTD reassignment ALSTOM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STAMATELOPOULOS, GEORG-NIKOLAUS, BERNDT, THORALF, WEISSINGER, GERHARD, CHEN, QIURONG
Publication of US20120272929A1 publication Critical patent/US20120272929A1/en
Assigned to GENERAL ELECTRIC TECHNOLOGY GMBH reassignment GENERAL ELECTRIC TECHNOLOGY GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ALSTOM TECHNOLOGY LTD
Abandoned legal-status Critical Current

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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 once-through steam generator for burning dry brown coal without the aid of recycled flue gas in its combustion chamber, the once-through steam generator having a combustion chamber, a flue gas pass which adjoins the upper end of said combustion chamber, and enclosure walls which enclose them, the enclosure walls being formed from tube walls, the tubes of which conduct the working medium water/steam, the combustion chamber having at least one burner, and heating surfaces being arranged in the flue gas pass.
  • a once-through steam generator which is fired with dry brown coal (DBC) or a power plant which is configured with said steam generator has considerable potential to increase the degree of efficiency over a once-through steam generator which is fired conventionally with raw brown coal (RBC) or a power plant which is configured with said steam generator.
  • the DBC is produced in an energetically favorable manner from RBC in a process which takes place before the combustion.
  • the calorific value and the heat quantity to be transferred thereby in the combustion chamber of the steam generator rise considerably.
  • the combustion chamber has to be designed in such a way that a final combustion chamber temperature in the range from 950 to 1150° C.
  • the medium-side steam temperature which results on account of the heat absorption of the enclosure walls is pivotal for the material selection of the tube walls which are used as enclosure walls and are produced from a tube-web-tube connection.
  • the material T23 is listed, for example, in the VdTÜV material sheet 511/2, edition 06.2001 and the material T24 is listed, for example, in the standard specification sheet DIN EN 10216-2, edition October 2007.
  • a flue gas recirculation system with a flue gas recirculation fan is necessary.
  • the convection heating surfaces which are used are in some circumstances 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 the internal electric consumption of the power plant and increases the running operating costs.
  • the heat absorption is not limited in a once-through steam generator in its evaporator, since the medium temperature at the evaporator outlet is already superheated during once-through operation and the level of the superheating can be fixed variably.
  • the associated temperature level of the steam or the corresponding design temperature in the enclosure walls is controlled by a suitable material selection and, if DBC is burnt, by suitable flue gas recirculation into the combustion chamber.
  • the solution according to the invention provides a once-through steam generator for burning dry brown coal, which once-through steam generator has the following advantages:
  • the platen heating surface which covers part of the enclosure walls in the region of the combustion chamber is arranged between the upper edge of the uppermost burner and the lower edge of the lowermost heating surface.
  • At least part of the enclosure walls is formed from one of the materials T23, T24 or another material with a similar chemical composition.
  • at least that part of the enclosure walls is configured with the abovementioned materials which is thermally loaded highly or more highly than the remaining part of the enclosure walls.
  • the materials T23, T24 or another material with a similar chemical composition are high-quality materials which are commercially available and satisfy the desired requirements or on which no thermal post-treatment has to be carried out after they have been welded.
  • One advantageous embodiment of the invention provides for the platen heating surface to be formed or produced from martensitic materials with a 9-12% chromium proportion, austenitic materials or nickel-based alloys. This ensures that, with regard to the temperatures, the requirements made of the platen heating surface which lies exposed in the combustion chamber are satisfied.
  • the platen heating surface is configured as a superheater heating surface or a reheater heating surface.
  • the platen heating surface is therefore incorporated efficiently into the water/steam circuit of the once-through steam generator or into the water/steam circuit of a power plant which comprises a once-through steam generator of this type.
  • the platen heating surface is arranged parallel to the enclosure wall. This achieves a situation where the platen heating surface is arranged vertically just like the enclosure wall and affords as small as possible an action surface for ash or cinder from the combustion chamber.
  • the platen heating surface is arranged such that it bears against the enclosure wall. This ensures that the enclosure wall is covered as satisfactorily as possible by the platen heating surface and the smallest possible quantity of heat passes to the enclosure wall.
  • FIG. 1 diagrammatically shows a longitudinal section through a once-through steam generator according to the invention
  • FIG. 2 shows the same as FIG. 1 , but in an alternative embodiment.
  • FIG. 1 diagrammatically shows a once-through steam generator 1 (the designation means the generation of the steam within the steam generator in one pass) of tower design, that is to say the tube walls 5 (as enclosure walls 4 ) and all the heating surfaces 7 are accommodated on or in a single vertical gas flue.
  • the vertical gas flue which is formed or delimited by gastight enclosure walls 4 contains, in its lower region, the combustion chamber 2 and the flue gas pass 3 which adjoins above said combustion chamber 2 .
  • the combustion chamber 2 terminates to the bottom as a rule with a combustion chamber hopper and reaches upward as far as the lowermost heating surface 7 .
  • One or more burners 6 for burning dry brown coal are arranged in the lower region of the combustion chamber 2 .
  • 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 heating surfaces 7 are arranged as convection heating surfaces in the flue gas pass 3 . Said heating surfaces 7 are as a rule economizer heating surfaces, superheater heating surfaces and reheater heating surfaces.
  • the flue gas pass 3 terminates at the top with a ceiling and has a flue gas outlet 9 laterally at its upper end.
  • the once-through steam generator 1 has at least one platen heating surface 8 which covers part of the enclosure walls 4 in the region of the combustion chamber 2 and the surface-side size of which is defined such that the heat absorption of the enclosure walls 4 and, as a consequence, their temperature are reduced to a value which permits the configuration of the enclosure wall 4 from modified, heat-resistant 2.25-2.5% chromium steels which do not require any thermal post-treatment after they have been processed using welding technology.
  • the platen heating surface 8 which covers the enclosure wall 4 in the region of the combustion chamber 2 with a predefined surface-side size, absorbs so much heat from the combustion chamber 2 that the heat absorption of the enclosure wall 4 is reduced as a consequence of the covering, in such a way that the maximum medium temperature at the enclosure wall 4 remains below a value which allows the use of modified, heat-resistant 2.25-2.5% chromium steels which do not require any thermal post-treatment after they have been processed using welding technology.
  • They can be, for example, the materials T23 (a material which is approved by the ASME (American Society of Mechanical Engineers)), T24 (7CrMoVTiB10-10) or another material with a similar chemical composition which can cover steam temperatures up to approximately 500-510° C.
  • these abovementioned high-quality materials which do not require any thermal post-treatment after they have been processed using welding technology can either be used everywhere on the enclosure wall 4 or, according to one commercially more advantageous variant, at least at those parts of the enclosure walls 4 where the high thermal loading makes it necessary. They are, for example, the regions at the burners 6 and directly above the burners 6 within the combustion chamber 2 .
  • lower-quality materials such as 16Mo3 or 13CrMo45, are used at those parts of the enclosure walls 4 where the thermal loading is lower, such as in the lower part of the combustion chamber 2 (below the burners 6 including combustion chamber hopper) with medium temperatures of approximately ⁇ 400-460° C. in the tube walls.
  • Said materials likewise do not require any thermal post-treatment after they have been processed using welding technology.
  • the enclosure walls 4 which are configured as tube walls 5 are produced as a rule from a welded tube-web-tube combination, the tubes of the tube walls 5 conducting the working medium water/steam, and it being possible for them to be formed within the enclosure walls 4 either helically or vertically or from a combination of helically and vertically.
  • the tubes which are arranged in the enclosure walls 4 are used in the lower and middle part of the combustion chamber 2 as evaporator tubes, that is to say the water which is fed in and pre-heated is evaporated in said evaporator tubes.
  • the tubes which are arranged in the enclosure wall 4 can already be connected as a superheater heating surface.
  • the platen heating surface 8 itself which then absorbs part of the heat from the combustion chamber 2 , is formed using suitable materials according to the temperature requirements. Since very high temperatures have to be handled, martensitic 9-12% chromium-containing steels, austenitic steels or nickel-based alloys have proven to be suitable for this purpose.
  • the platen heating surface 8 can consist of individual tubes, which are arranged close to one another and in parallel, or of a tube-web-tube construction. The tubes of the platen heating surface 8 run as a rule horizontally within the heating surface, but can also run vertically.
  • the platen heating surface 8 is preferably arranged parallel to the enclosure wall 4 and more preferably so as to bear against the latter. This arrangement ensures that the enclosure wall 4 is covered very efficiently by the platen heating surface 8 , and the transmission of heat to the enclosure wall 4 is therefore suppressed as far as possible.
  • FIG. 2 shows one advantageous variant of the platen heating surface 8 according to the invention.
  • the enclosure wall 4 and tube wall 5 which as a rule contain the front and rear walls and two side walls of the once-through steam generator, are covered partially by one or more platen heating surfaces 8 in the region of the combustion chamber 2 , to be precise between the upper edge of the uppermost burner 6 and the lower edge of the lowermost heating surface 7 (the region is marked or denoted by “S” in FIG.
  • the platen heating surface 8 can advantageously be used as a superheater heating surface within the once-through steam generator 1 .
  • the use as a reheater heating surface is also possible.

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  • 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)
US13/393,650 2009-09-04 2010-08-20 Once-through steam generator for burning dry brown coal Abandoned US20120272929A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009040249A DE102009040249B4 (de) 2009-09-04 2009-09-04 Zwangdurchlaufdampferzeuger für die Verfeuerung von Trockenbraunkohle
DE102009040249.7 2009-09-04
PCT/DE2010/000982 WO2011026462A2 (de) 2009-09-04 2010-08-20 Zwangdurchlaufdampferzeuger für die verfeuerung von trockenbraunkohle

Publications (1)

Publication Number Publication Date
US20120272929A1 true US20120272929A1 (en) 2012-11-01

Family

ID=43649691

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/393,650 Abandoned US20120272929A1 (en) 2009-09-04 2010-08-20 Once-through steam generator for burning dry brown coal

Country Status (10)

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

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770030A (en) * 1950-06-15 1956-11-13 Babcock & Wilcox Co Welded joint between dissimilar metals
US2960390A (en) * 1954-07-30 1960-11-15 Combustion Eng Superheater for chemical recovery unit
US3125995A (en) * 1964-03-24 forced flow vapor generating unit
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
US3534713A (en) * 1968-07-01 1970-10-20 Foster Wheeler Corp Flow circuit for division wall
US4442796A (en) * 1982-12-08 1984-04-17 Electrodyne Research Corporation Migrating fluidized bed combustion system for a steam generator
US5146878A (en) * 1990-12-21 1992-09-15 A. Ahlstrom Corporation Boiler and a supported heat transfer bank
US5308698A (en) * 1992-05-21 1994-05-03 Inco Alloys International, Inc. Flux for coated welding electrode
US5946901A (en) * 1997-12-17 1999-09-07 Combustion Engineering, Inc. Method and apparatus for improving gas flow in heat recovery steam generators
WO2000042354A1 (en) * 1999-01-13 2000-07-20 Abb Alstom Power Inc. Startup technique using multimode operation in a kalina cycle power generation system
US20020017100A1 (en) * 2000-08-11 2002-02-14 Thoralf Berndt Steam generator plant
US6957630B1 (en) * 2005-03-31 2005-10-25 Alstom Technology Ltd Flexible assembly of once-through evaporation for horizontal heat recovery steam generator
US20060124077A1 (en) * 2002-11-22 2006-06-15 Gerhard Weissinger Continuous steam generator with circulating atmospheric fluidised-bed combustion
US20100031506A1 (en) * 2008-08-08 2010-02-11 Ruben Hartwig Method for producing steam generator tube walls consisting primarily of 9-12% martensitic chromium steels

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
NL129291C (de) * 1961-07-27
US3274977A (en) * 1964-11-12 1966-09-27 Combustion Eng Arrangement of a buckstay system for wide furnace steam generators
US6675747B1 (en) * 2002-08-22 2004-01-13 Foster Wheeler Energy Corporation System for and method of generating steam for use in oil recovery processes
DE10257305A1 (de) * 2002-12-07 2004-06-17 Kümmel, Joachim, Dipl.-Ing. Verfahren und Vorrichtung zum Überhitzen von Dampf in korrosiver Rauchgasatmosphäre
US7028882B2 (en) * 2004-02-02 2006-04-18 General Electric Company Process and apparatus for boiler tube panel welding and straightening

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US2960390A (en) * 1954-07-30 1960-11-15 Combustion Eng Superheater for chemical recovery unit
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
US3534713A (en) * 1968-07-01 1970-10-20 Foster Wheeler Corp Flow circuit for division wall
US4442796A (en) * 1982-12-08 1984-04-17 Electrodyne Research Corporation Migrating fluidized bed combustion system for a steam generator
US5146878A (en) * 1990-12-21 1992-09-15 A. Ahlstrom Corporation Boiler and a supported heat transfer bank
US5308698A (en) * 1992-05-21 1994-05-03 Inco Alloys International, Inc. Flux for coated welding electrode
US5946901A (en) * 1997-12-17 1999-09-07 Combustion Engineering, Inc. Method and apparatus for improving gas flow in heat recovery steam generators
WO2000042354A1 (en) * 1999-01-13 2000-07-20 Abb Alstom Power Inc. Startup technique using multimode operation in a kalina cycle power generation system
US20020017100A1 (en) * 2000-08-11 2002-02-14 Thoralf Berndt Steam generator plant
US20060124077A1 (en) * 2002-11-22 2006-06-15 Gerhard Weissinger Continuous steam generator with circulating atmospheric fluidised-bed combustion
US6957630B1 (en) * 2005-03-31 2005-10-25 Alstom Technology Ltd Flexible assembly of once-through evaporation for horizontal heat recovery steam generator
US20100031506A1 (en) * 2008-08-08 2010-02-11 Ruben Hartwig Method for producing steam generator tube walls consisting primarily of 9-12% martensitic chromium steels

Also Published As

Publication number Publication date
IN2012DN02835A (de) 2015-07-24
HUE029835T2 (en) 2017-04-28
WO2011026462A8 (de) 2012-04-05
EP2473783B1 (de) 2016-04-20
SI2473783T1 (sl) 2016-08-31
EP2473783A2 (de) 2012-07-11
PL2473783T3 (pl) 2016-12-30
DE102009040249B4 (de) 2011-12-08
CN102782405B (zh) 2016-01-13
AU2010291653B2 (en) 2016-03-17
AU2010291653A1 (en) 2012-04-12
WO2011026462A3 (de) 2012-08-16
WO2011026462A2 (de) 2011-03-10
CN102782405A (zh) 2012-11-14
DE102009040249A1 (de) 2011-09-08

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERNDT, THORALF;CHEN, QIURONG;STAMATELOPOULOS, GEORG-NIKOLAUS;AND OTHERS;SIGNING DATES FROM 20120302 TO 20120313;REEL/FRAME:028217/0757

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