EP0977964A1 - Generateur de vapeur a flux continu et son procede de demarrage - Google Patents

Generateur de vapeur a flux continu et son procede de demarrage

Info

Publication number
EP0977964A1
EP0977964A1 EP98931919A EP98931919A EP0977964A1 EP 0977964 A1 EP0977964 A1 EP 0977964A1 EP 98931919 A EP98931919 A EP 98931919A EP 98931919 A EP98931919 A EP 98931919A EP 0977964 A1 EP0977964 A1 EP 0977964A1
Authority
EP
European Patent Office
Prior art keywords
steam generator
heating surface
continuous
gas
tubes
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
EP98931919A
Other languages
German (de)
English (en)
Other versions
EP0977964B1 (fr
Inventor
Eberhard Wittchow
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0977964A1 publication Critical patent/EP0977964A1/fr
Application granted granted Critical
Publication of EP0977964B1 publication Critical patent/EP0977964B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F22B29/061—Construction of tube walls
    • F22B29/062—Construction of tube walls involving vertically-disposed water tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/06—Control systems for steam boilers for steam boilers of forced-flow type
    • F22B35/14—Control systems for steam boilers for steam boilers of forced-flow type during the starting-up periods, i.e. during the periods between the lighting of the furnaces and the attainment of the normal operating temperature of the steam boilers

Definitions

  • the invention relates to a once-through steam generator according to the preamble of claim 1.
  • a steam generator is known from EP 0 308 728 AI.
  • a continuous steam generator In a once-through steam generator, the heating of a number of evaporator tubes, which together form the gas-tight peripheral wall of a combustion chamber, leads to complete evaporation of the flow medium in the evaporator tubes in one pass. After its evaporation, the flow medium - usually water - is fed to the superheater tubes connected downstream of the evaporator tubes and overheated there.
  • a high live steam pressure favors high thermal efficiency and thus low C0 2 emissions from a fossil-fired power plant.
  • Such a continuous steam generator can be designed as a single-pass or double-pass design.
  • steam generator pipes are usually welded together in a gas-tight manner to form the peripheral wall of a single gas train, the gas train being arranged vertically.
  • the steam generator tubes forming the peripheral wall of the gas train generally include both evaporator tubes and superheater tubes connected downstream of these on the fluid side.
  • a combustion chamber with a number of burners for fossil fuel is usually provided in a lower area of the gas train.
  • steam generator pipes are usually also welded to one another in a gas-tight manner to form the peripheral wall of a vertically arranged first gas train.
  • the first gas flue is followed by a second vertically arranged gas flue on the hot gas side via a horizontal gas flue, the peripheral wall of which is also formed by steam generator tubes and through which the heating gas usually flows from top to bottom.
  • a continuous steam generator in a two-pass design usually has a lower overall height in comparison to a pass-through steam generator in a pull-in type and differs from this in a number of design parameters.
  • the steam generator pipes forming the peripheral wall of the first gas train are usually designed as evaporator pipes, whereas steam generator pipes designed as superheater pipes are part of the peripheral wall of the second gas train and / or part of a wall heating surface of the horizontal gas train.
  • the steam generator pipes assigned to the horizontal gas train and the second gas train are usually connected downstream of the steam generator pipes assigned to the first gas train on the flow medium side.
  • the steam generator tubes assigned to the first gas train open out on the output side into an outlet collector common to them, which is followed by an inlet collector for the steam generator tubes assigned to the second gas train via a water-steam separation device and a number of heating surfaces arranged in the horizontal gas train.
  • a number of steam generator tubes connected in parallel for the flow of a flow medium are connected to one another to form an evaporator heating surface which is part of a peripheral wall of the first gas flue.
  • the steam generator tubes forming the evaporator heating surface open out on the output side into a common outlet manifold, which is lower than the bottom edge of the horizontal throttle cable.
  • the invention is therefore based on the object of specifying a two-pass steam generator which has a particularly long service life even with frequent start-up processes.
  • a particularly favorable method for starting up such a once-through steam generator is to be specified.
  • a bulkhead heating surface is connected directly downstream of the outlet header on the flow medium side.
  • the bulkhead heating surface is to be understood as a number of steam generator tubes connected in parallel for the flow of the flow medium and opening into a common inlet and a common outlet header, the steam generator tubes lying close together in one plane and thus forming a number of plate-like heating surfaces. which are suspended within the throttle cable.
  • the invention is based on the consideration that for a particularly long service life of the once-through steam generator, the thermal stresses between the peripheral wall of the first throttle cable and the walls of the horizontal throttle cable should be kept particularly low, even with frequent starting operations.
  • the temperature differences between the steam generator tubes, which are filled with cold feed water and assigned to the first gas flue immediately before the burners are ignited, and the walls of the horizontal gas flue, which are still comparatively hot during a warm start, should be kept particularly low.
  • the outlet header of the steam generator tubes assigned to the first gas flue is arranged at a height such that direct contact of the steam generator tubes filled with cold feed water before starting is avoided with the walls of the horizontal gas flue that are still hot during a warm start.
  • the heating surfaces provided for steam generation are dimensioned particularly large during the start-up.
  • the bulkhead heating surface is connected downstream of the steam generator tubes forming the evaporator heating surface as an additional heating surface provided for steam generation.
  • the bulkhead heating surface is expediently in a room area within the first gas flue above that in the first Throttle cable provided combustion chamber.
  • the bulkhead heating surface is thus arranged in a particularly heated area when the continuous steam generator is started up and contributes to a particularly high degree to the steam generation.
  • a large amount of steam is generated, which contributes to a particularly effective cooling of the steam generator pipes which are arranged downstream of the steam generator pipes and are designed as superheater pipes.
  • an advantageous embodiment of the evaporator tubes through which the evaporating flow medium flows and which is separated from the superheater tubes through which evaporated flow medium flows is connected downstream of the bulkhead heating surface on the flow side.
  • a steam-side outlet of the water-steam separating device is connected to an inlet header for a number of further steam generator tubes provided as superheater tubes, these steam generator tubes forming the upper part of the peripheral wall of the first gas flue, and this inlet header in one compared to Lower edge of the horizontal throttle cable is arranged at a lower height.
  • the above-mentioned object is achieved in that after the onset of water ejection from the steam generator tubes forming the evaporator heating surface, the flow medium throughput thereof is temporarily reduced.
  • the water output should therefore be kept particularly low.
  • This is achievable for the continuous steam generator shown above by first filling the steam generator tubes assigned to the peripheral wall of the first gas flue with undamped flow medium up to a height of the outlet collector connected downstream of them before igniting the burners. Excess unevaporated flow medium or water can be passed directly to the water-steam separating device bypassing the bulkhead heating surface via a bypass valve. When the burners are ignited, an initial mass flow of flow medium or feed water is initially supplied to the steam generator tubes designed as evaporator tubes. The flow medium partially evaporates in the steam generator tubes opening into the outlet header, the non-evaporated flow medium reaching the bulkhead heating surface downstream of the outlet header. Since this is also designed as an evaporator heating surface and is therefore filled with undevaporated flow medium c ⁇ c ⁇ to to P> P 1 c ⁇ O C ⁇ o C ⁇ o C ⁇
  • DJ Hi d »PJ rt ⁇ tr C ⁇ Hi P. ddd ⁇ d - ⁇ d N ⁇ ⁇ s: d ii ⁇ cn ⁇ d O tsi ⁇ ⁇ d ⁇ rt P- PJ rt ⁇ Q ⁇ d - y ⁇ rt z ⁇ ⁇ ⁇ ⁇ do vQ> « r cn M yQ ö tr Z d P- d ⁇ 3 PJ ⁇ ⁇ ö P- ⁇ Q P- ⁇ P- ⁇ PJ P- O tr dd ⁇ N cn DJ ⁇ P- • d tr P- N ⁇ TJ d PJ d ⁇ d il cn tr d 3 d ⁇ -i -3 ⁇ PJ dd il ⁇ 3 cn ⁇ ⁇ ⁇ dd Hi yQ d ⁇ ⁇ -
  • FIG. 2 shows a section of a peripheral wall of the once-through steam generator according to FIG. 1, and
  • FIG. 3 shows an inlet header and an outlet header of the once-through steam generator according to FIG. 1.
  • the continuous steam generator 1 comprises a number of burners 2 for a fossil fuel, which are shown schematically in FIG. 1 on the basis of their main axes.
  • the burners 2 are arranged in a combustion chamber 4, which is formed by a lower part of the peripheral wall 6 of a vertically arranged first gas flue 8.
  • the surrounding wall 6 merges into a funnel-shaped base 10 at the lower end of the first throttle cable 8 formed by it.
  • the continuous steam generator 1 according to FIG. 1 is of the two-pass design.
  • a second gas train 14 is connected downstream of the first gas train 8 for heating gas resulting from the combustion of the fossil fuel via a horizontal gas train 12.
  • the second throttle cable 14 is also arranged vertically.
  • the surrounding wall 6 of the first throttle cable 8 is constructed from steam generator tubes 16, 17, which are connected to one another in a gas-tight manner on their longitudinal sides, for example welded.
  • the surrounding wall 18 of the second throttle cable 14 is also made of steam LO o to ro P>P>

Landscapes

  • 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)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un générateur de vapeur à flux continu (1) du type à deux passages. Un deuxième passage de gaz (14) est monté en aval d'un premier passage de gaz (8) côté gaz chauds par l'intermédiaire d'un passage de gaz horizontal (12). Dans un générateur de vapeur (1) de ce type, lequel doit avoir une durée de vie particulièrement longue même en cas de démarrages fréquents, un certain nombre de tuyaux (16) du générateur de vapeur, reliés en parallèle pour la circulation d'un milieu en écoulement, sont interconnectés pour former une surface chauffante d'évaporation (22) faisant partie d'une paroi périphérique (6) du premier passage de gaz (8). Les tuyaux (16) formant cette surface chauffante d'évaporation (22) débouchent côté sortie dans un collecteur de sortie commun (24) monté plus bas par rapport à un bord inférieur (44) du passage de gaz horizontal (12). Une surface chauffante de cloison étanche (26) est montée en aval de ce connecteur de sortie (24), côté milieu en écoulement.
EP98931919A 1997-04-23 1998-04-14 Generateur de vapeur a flux continu et son procede de demarrage Expired - Lifetime EP0977964B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19717158A DE19717158C2 (de) 1997-04-23 1997-04-23 Durchlaufdampferzeuger und Verfahren zum Anfahren eines Durchlaufdampferzeugers
DE19717158 1997-04-23
PCT/DE1998/001055 WO1998048217A1 (fr) 1997-04-23 1998-04-14 Generateur de vapeur a flux continu et son procede de demarrage

Publications (2)

Publication Number Publication Date
EP0977964A1 true EP0977964A1 (fr) 2000-02-09
EP0977964B1 EP0977964B1 (fr) 2002-08-28

Family

ID=7827504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98931919A Expired - Lifetime EP0977964B1 (fr) 1997-04-23 1998-04-14 Generateur de vapeur a flux continu et son procede de demarrage

Country Status (9)

Country Link
US (1) US6192837B1 (fr)
EP (1) EP0977964B1 (fr)
KR (1) KR100543383B1 (fr)
CN (1) CN1126905C (fr)
CA (1) CA2287177A1 (fr)
DE (2) DE19717158C2 (fr)
DK (1) DK0977964T3 (fr)
RU (1) RU2188357C2 (fr)
WO (1) WO1998048217A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP1288567A1 (fr) * 2001-08-31 2003-03-05 Siemens Aktiengesellschaft Générateur de vapeur et procédé de démarrage d'un générateur de vapeur ayant un canal de gas de chauffage, celui-ci étant traversé par le gas de chauffage avec une direction sensiblement horizontale
US20050072379A1 (en) * 2003-08-15 2005-04-07 Jupiter Oxygen Corporation Device and method for boiler superheat temperature control
CN101056719A (zh) * 2004-11-12 2007-10-17 朱比特氧气公司 用于锅炉过热温度控制的装置和方法
US7516620B2 (en) 2005-03-01 2009-04-14 Jupiter Oxygen Corporation Module-based oxy-fuel boiler
EP1710498A1 (fr) * 2005-04-05 2006-10-11 Siemens Aktiengesellschaft Générateur de vapeur
KR100902538B1 (ko) 2007-05-15 2009-06-15 주피터 옥시젠 코포레이션 보일러 및 보일러의 버너 개조 방법
EP2065641A3 (fr) * 2007-11-28 2010-06-09 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur en flux continu, ainsi que générateur de vapeur en flux à sens unique
EP2119880A1 (fr) 2008-02-15 2009-11-18 Siemens Aktiengesellschaft Procédé destiné à démarrer une chaudière à vapeur
EP2194320A1 (fr) * 2008-06-12 2010-06-09 Siemens Aktiengesellschaft Procédé de fonctionnement d'un générateur de vapeur à passage unique et générateur de vapeur à passage unique
EP2204611A1 (fr) * 2008-09-09 2010-07-07 Siemens Aktiengesellschaft Générateur de vapeur à récupération de chaleur
EP2180251A1 (fr) * 2008-09-09 2010-04-28 Siemens Aktiengesellschaft Générateur de vapeur en continu
EP2180250A1 (fr) * 2008-09-09 2010-04-28 Siemens Aktiengesellschaft Générateur de vapeur en continu
EP2182278A1 (fr) * 2008-09-09 2010-05-05 Siemens Aktiengesellschaft Générateur de vapeur en continu
DE102009024587A1 (de) * 2009-06-10 2010-12-16 Siemens Aktiengesellschaft Durchlaufverdampfer
DE102009040250B4 (de) * 2009-09-04 2015-05-21 Alstom Technology Ltd. Zwangdurchlaufdampferzeuger für den Einsatz von Dampftemperaturen von über 650 Grad C
US20120012036A1 (en) * 2010-07-15 2012-01-19 Shaw John R Once Through Steam Generator
DE102013215457A1 (de) 2013-08-06 2015-02-12 Siemens Aktiengesellschaft Durchlaufdampferzeuger in Zweizugkesselbauweise
CN104154513A (zh) * 2014-04-23 2014-11-19 盐城市锅炉制造有限公司 罐式煅烧炉的余热锅炉
CN112162484B (zh) * 2020-09-24 2023-03-14 华北电力大学（保定） 一种适用于深调峰运行的火电机组柔性协调控制方法

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Also Published As

Publication number Publication date
CA2287177A1 (fr) 1998-10-29
CN1249807A (zh) 2000-04-05
KR20010012074A (ko) 2001-02-15
EP0977964B1 (fr) 2002-08-28
US6192837B1 (en) 2001-02-27
WO1998048217A1 (fr) 1998-10-29
RU2188357C2 (ru) 2002-08-27
DE19717158C2 (de) 1999-11-11
DE19717158A1 (de) 1998-11-05
KR100543383B1 (ko) 2006-01-20
DK0977964T3 (da) 2002-12-30
CN1126905C (zh) 2003-11-05
DE59805320D1 (de) 2002-10-02

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