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EP3472515B1 - Générateur de vapeur vertical à récupération de chaleur - Google Patents

Générateur de vapeur vertical à récupération de chaleur Download PDF

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Publication number
EP3472515B1
EP3472515B1 EP16741612.2A EP16741612A EP3472515B1 EP 3472515 B1 EP3472515 B1 EP 3472515B1 EP 16741612 A EP16741612 A EP 16741612A EP 3472515 B1 EP3472515 B1 EP 3472515B1
Authority
EP
European Patent Office
Prior art keywords
low
pressure
preheater
flow medium
hot gas
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.)
Active
Application number
EP16741612.2A
Other languages
German (de)
English (en)
Other versions
EP3472515A1 (fr
Inventor
Jan BRÜCKNER
Frank Thomas
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 Energy Global GmbH and Co KG
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Priority to PL16741612T priority Critical patent/PL3472515T3/pl
Publication of EP3472515A1 publication Critical patent/EP3472515A1/fr
Application granted granted Critical
Publication of EP3472515B1 publication Critical patent/EP3472515B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/003—Feed-water heater systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups

Definitions

  • the invention relates to a vertical heat recovery steam generator according to claim 1.
  • Heat recovery steam generators are used today in many power plants to increase the efficiency of the plant.
  • Current developments are aimed at developing an efficient vertical boiler in addition to the usual horizontal boiler design.
  • One consideration is to design all three pressure stages as a once-through system, so that in comparison to the current horizontal boiler design, the large and massive drums can also be dispensed with in the medium and low pressure range. This would also make the entire steel structure of the boiler leaner and cheaper.
  • the object of the invention is to provide an improved vertical heat recovery steam generator.
  • the low-pressure evaporator is no longer fed by the flow medium from the condensate preheater, but instead is implemented by its own preheating circuit, it must be ensured analogously to the condensate preheater that the temperature of the flow medium never falls below a system-relevant design temperature within the pipes of the low-pressure preheater. This is the only way to ensure that the pipes are not subject to corrosion during operation.
  • the vertical heat recovery steam generator has a condensate preheater with at least one condensate preheater heating surface through which hot gas flows and through which a flow medium flows, and a low-pressure preheater with at least one low-pressure preheater surface arranged in the hot gas duct and through which the flow medium flows comprises a low-pressure evaporator with at least one low-pressure evaporator heating surface arranged in the hot gas duct and through which the flow medium flows, the at least one low-pressure preheater heating surface and the at least one low-pressure evaporator heating surface being flowed through in succession and without additional pressure compensation by the flow medium.
  • a first of the at least one Low pressure preheater heating surfaces in the hot gas duct in the hot gas direction after a first of the at least one condensate preheater heating surfaces Preferably, a first of the at least one Low pressure preheater heating surfaces in the hot gas duct in the hot gas direction after a first of the at least one condensate preheater heating surfaces.
  • the low-pressure and the condensate preheater heating surfaces in the hot gas duct could also be arranged largely in the same area (for example, interlaced).
  • a separate low-pressure preheater (LP economizer) with corresponding low-pressure preheater heating surfaces is provided in the present invention.
  • LP economizer low-pressure preheater
  • a two-part arrangement of these heating surfaces is preferably selected, on the one hand behind the condensate preheater at the flue gas duct outlet and on the other hand from a thermodynamically suitable point of view between the heating surfaces of a two-part condensate preheater.
  • the arrangement of the low-pressure preheater in the coldest section of the flue gas duct ensures that the flow medium does not evaporate in the pipes with small internal diameters there, so that static and dynamic flow stability can be achieved.
  • the arrangement of the second low-pressure preheater heating surface at a suitable location between the two condensate preheater heating surfaces ensures that the feed water for the low-pressure system is preheated.
  • an arrangement which meets the requirements, namely to ensure a minimum temperature of the flow medium at the inlet of the low-pressure preheater, without additional economic or operational disadvantages occurring.
  • the flow medium at the inlet of the condensate preheater ie before the first condensate preheater heating surface, is removed to supply the low-pressure system.
  • This removal is advantageously carried out via a branch and a corresponding control valve behind or downstream of the integration of the condensate preheater circulating mass flow, which regulates the inlet temperature of the flow medium into the condensate preheater.
  • This ensures that the temperature of the flow medium at the entry of the first low-pressure preheating surface has the same temperature as at the entry of the first condensate preheating surface.
  • Both systems i.e. the condenser preheater and the low-pressure stage, are thus subjected to the same inlet temperature. This ensures that even in the low-pressure system, the minimum temperature of the flow medium required from a corrosion point of view is not exceeded.
  • the flow medium supplied at the inlet of the low-pressure preheater has almost the same temperature as at the inlet of the condensate preheater.
  • the regulation of the fluid temperature at the inlet of the condensate preheater which is usually ensured by the additional circulation circuit of the condensate preheater, thus also ensures the inlet temperature of the flow medium at the low-pressure preheater that is required from a corrosion point of view.
  • an increased temperature of the flow medium is thus also ensured in the inlet area of the low-pressure preheater.
  • an independent circulation circuit is integrated into the low-pressure system, consisting of low-pressure preheater and low-pressure evaporator, and the low-pressure evaporator is also over-fed.
  • the water that has not yet evaporated and is separated from the steam in a water-steam separator and is at the boiling temperature level is then returned to the inlet of the low-pressure preheater via a low-pressure circulation pump and mixed with the cold feed water.
  • the required minimum temperature of the flow medium at the inlet of the first low-pressure preheater heating surface can be set appropriately by a suitable choice of the degree of overfeeding of the low-pressure evaporator and the associated recirculation amount.
  • An advantage of this embodiment variant is that, due to the overfeeding, there is a comparatively high evaporator throughput, which in turn has a favorable influence on the stability properties of the flow in the low-pressure evaporator.
  • this embodiment has the disadvantage that additional equipment (such as a circulation pump, control valves, etc.) is required for the circulation circuit.
  • additional equipment such as a circulation pump, control valves, etc.
  • the flow medium cannot be overheated at any point in the entire operating range at the outlet of the low-pressure evaporator, since the low-pressure evaporator generally has to be operated in wet operation with an overfeeding level required to set the minimum temperature of the flow medium at the inlet of the low-pressure preheater.
  • FIG. 1 schematically shows the preferred embodiment variant of a forced-flow low pressure system of a vertical heat recovery steam generator to ensure flow stability.
  • This comprises a condensate preheater with a hot gas duct 1 through which hot gas H flows and a condensate preheater heating surface 20 through which a flow medium (S) flows, a low-pressure preheater with a low-pressure preheater heating surface 30 arranged in the hot gas channel 1 and through which the flow medium S flows, and a low-pressure evaporator with a low-pressure evaporator heating surface 40 arranged in the hot gas duct 1 and through which the flow medium S flows.
  • S flow medium
  • the low-pressure preheater heating surface 30 and the 40 are designed here so that the flow medium S flows through them in succession in a single pass and without additional pressure equalization.
  • the low-pressure preheater heating surfaces 30 is arranged in the hot gas duct 1 in the hot gas direction after the condensate preheater heating surfaces 20.
  • a branch 50 is provided in a first feed line 24 of the flow medium S to the condensate preheater for supplying part of the flow medium S to the low-pressure preheater. Furthermore, a control valve 35 is provided after the branch 50 in a second feed line 34 to the low pressure preheater, which regulates the amount of the branched flow medium S to the low pressure preheater.
  • a circulation pump 23 is provided here for the condensate preheater, which recirculates the flow medium heated in the condensate preheater heating surfaces via lines 25 and 27 and a first connection point 26, the first connection point 26 being arranged in the first supply line 24 in front of the branch 50 is.
  • FIG 2 shows a development of the previously described embodiment of a vertical heat recovery steam generator, but with a condensate preheater which comprises two condensate preheater heating surfaces 21 and 22, which are arranged spatially separated in the hot gas duct 1 and flowed through by the flow medium S in succession.
  • the heat recovery steam generator here has a low-pressure preheater, with two low-pressure preheater heating surfaces 31 and 32 arranged spatially separated in the hot gas duct 1 and through which the flow medium S flows in succession, and a low-pressure evaporator with at least one in the hot gas duct 1 arranged and flow medium from the flow medium S following the low pressure preheater heating surfaces on low pressure evaporator heating surface.
  • the first low-pressure preheater heating surface 31 through which the flow medium S flows is arranged in the hot gas duct 1 in the hot gas direction behind the first condensate preheater heating surface 21, and the second low-pressure preheater heating surface 32 through which the flow medium S flows is arranged in the hot gas direction between the first and the second condensate preheater heating surfaces 21 and 22.
  • a branch 50 is provided in a feed line 24 of the flow medium S to the condensate preheater for supplying part of the flow medium S to the low-pressure preheater, the amount of the branched-off flow medium S being regulated by a control valve 35.
  • FIG 3 and FIG 4 show an alternative embodiment of a vertical heat recovery steam generator.
  • the embodiment shown here is also provided for the low-pressure preheater and low-pressure evaporator circuit to return a low-pressure circulating pump 52 to the second feed line 34 via a water-steam separator 60, a return line 51 and a connection point 53 through which the low-pressure preheater and evaporator heating surfaces flow and are not evaporated.
  • the circulating mass flow conducted via the low-pressure circulating pump 52 and the return line 51 can be adjusted such that the desired temperature of the flow medium S is achieved at the entry into the first low-pressure preheating heating surface.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Claims (6)

  1. Générateur de vapeur vertical à récupération de la chaleur perdue, dont les étages de basse pression sont constitués en système à circulation forcé, comprenant
    - un préchauffeur de condensat ayant au moins une surface (20, 21, 22) de chauffe de préchauffeur de condensat, disposée dans un conduit (1) pour du gaz (H) chaud et parcourue par un fluide (S) en écoulement,
    - un préchauffeur de basse pression ayant au moins une surface (30, 31, 32) de chauffe de préchauffeur de basse pression, disposée dans un conduit (1) pour du gaz chaud et parcourue par le fluide (S) en écoulement,
    - une évaporateur de basse pression ayant au moins une surface (40) de chauffe d'évaporateur de basse pression, disposée dans le conduit (1) pour du gaz chaud et parcourue par le fluide (S) en écoulement,
    - dans lequel la au moins une surface (30, 31, 32) de chauffe de préchauffeur de basse pression et la au moins une surface (40) de chauffe d'évaporateur de basse pression sont, dans un passage, parcourues l'une après l'autre et sans compensation de pression supplémentaire par le fluide (S) en écoulement, et dans lequel une première (30, 31) de la au moins une surface de chauffe de préchauffeur de basse pression est disposée dans le conduit (1) pour le gaz chaud dans la partie de sortie du conduit pour le gaz chaud et dans le sens du gaz chaud après une première (20, 21) des au moins une surface de chauffe de préchauffeur de condensat ou dans le sens du gaz chaud, dans une grande mesure, dans la même partie que la première (20, 21) de la au moins une surface de chauffe de préchauffeur de condensat.
  2. Générateur de vapeur vertical à récupération de la chaleur perdue suivant la revendication 1,
    caractérisé en ce que
    le préchauffeur de condensat comprend deux surfaces (21, 22) de chauffe de préchauffeur de condensat, disposées dans le conduit (1) pour du gaz chaud d'une manière séparées dans l'espace et parcourues l'une après l'autre par le fluide (S) en écoulement et le préchauffeur de basse pression comprend deux surfaces (31, 32) de chauffe de préchauffeur de basse pression, disposées séparément dans l'espace dans le conduit (1) pour le gaz chaud et parcourues l'une après l'autre par le fluide (S) en écoulement, la première surface (31) de chauffe de préchauffeur de basse pression parcourue par le fluide (S) en écoulement étant disposée dans le conduit (1) pour le gaz chaud, dans le sens du gaz chaud, après la première surface (21) de chauffe de préchauffeur de condensat et la deuxième surface (32) de chauffe de préchauffeur de basse pression parcourue ensuite par le fluide (S) en écoulement, étant disposée, dans le sens du gaz chaud, entre la première et la deuxième surfaces (21, 22) de chauffe de préchauffeur de condensat.
  3. Générateur de vapeur vertical à récupération de la chaleur perdue suivant la revendication 1 ou 2,
    caractérisé en ce que
    dans une première arrivée (24) du fluide (S) en écoulement vers le préchauffeur de condensat, est prévue une dérivation (50) d'alimentation du préchauffeur de basse pression en une partie du fluide (S) en écoulement.
  4. Générateur de vapeur vertical à récupération de la chaleur perdue suivant la revendication 3,
    caractérisé en ce qu'
    après la dérivation (50), dans une deuxième arrivée (34) en direction du préchauffeur de basse pression, est prévue une vanne (35) de réglage, qui règle la quantité du fluide (S) en écoulement dérivée allant au préchauffeur de basse pression.
  5. Générateur de vapeur vertical à récupération de la chaleur perdue suivant la revendication 3 ou 4,
    caractérisé en ce qu'
    il est prévu pour le préchauffeur de condensat, en outre, une pompe (23) de recirculation, qui retourne à la première arrivée (24), par des conduits (25, 27) et un premier point (26) d'entrée, le fluide en écoulement chauffé dans les surfaces de chauffe de préchauffeur de condensat, le premier point (26) d'entrée étant disposé dans la première arrivée (24), avant la dérivation (50).
  6. Générateur de vapeur vertical à récupération de la chaleur perdue suivant la revendication 1 ou 2,
    caractérisé en ce qu'
    il est prévu, pour le préchauffeur de basse pression et l'évaporateur de basse pression, une pompe (52) de recirculation de basse pression, qui, par un séparateur (60) eau-vapeur, un conduit (51) de retour et un deuxième point (53) d'entrée, retourne dans une deuxième arrivée (34) allant vers le préchauffeur de basse pression, le fluide (S) en écoulement non évaporé et passant dans les surfaces (30, 31, 32, 40) de chauffe du préchauffeur de basse pression et de l'évaporateur de basse pression.
EP16741612.2A 2016-07-19 2016-07-19 Générateur de vapeur vertical à récupération de chaleur Active EP3472515B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16741612T PL3472515T3 (pl) 2016-07-19 2016-07-19 Pionowy parowy kocioł odzysknicowy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/067169 WO2018014941A1 (fr) 2016-07-19 2016-07-19 Générateur de vapeur vertical à récupération de chaleur

Publications (2)

Publication Number Publication Date
EP3472515A1 EP3472515A1 (fr) 2019-04-24
EP3472515B1 true EP3472515B1 (fr) 2020-06-24

Family

ID=56507591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16741612.2A Active EP3472515B1 (fr) 2016-07-19 2016-07-19 Générateur de vapeur vertical à récupération de chaleur

Country Status (9)

Country Link
US (1) US11118781B2 (fr)
EP (1) EP3472515B1 (fr)
JP (1) JP6745971B2 (fr)
KR (1) KR102229868B1 (fr)
CN (1) CN109477633B (fr)
CA (1) CA3031202C (fr)
ES (1) ES2819906T3 (fr)
PL (1) PL3472515T3 (fr)
WO (1) WO2018014941A1 (fr)

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Also Published As

Publication number Publication date
ES2819906T3 (es) 2021-04-19
JP6745971B2 (ja) 2020-08-26
CN109477633A (zh) 2019-03-15
KR20190026913A (ko) 2019-03-13
JP2019522168A (ja) 2019-08-08
PL3472515T3 (pl) 2020-12-14
US11118781B2 (en) 2021-09-14
WO2018014941A1 (fr) 2018-01-25
US20190170344A1 (en) 2019-06-06
CN109477633B (zh) 2020-10-13
EP3472515A1 (fr) 2019-04-24
KR102229868B1 (ko) 2021-03-19
CA3031202C (fr) 2020-07-21
CA3031202A1 (fr) 2018-01-25

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