EP0296064A1 - Wasserreinigungsbehälter mit einem Dampferzeuger - Google Patents

Wasserreinigungsbehälter mit einem Dampferzeuger Download PDF

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Publication number
EP0296064A1
EP0296064A1 EP88401502A EP88401502A EP0296064A1 EP 0296064 A1 EP0296064 A1 EP 0296064A1 EP 88401502 A EP88401502 A EP 88401502A EP 88401502 A EP88401502 A EP 88401502A EP 0296064 A1 EP0296064 A1 EP 0296064A1
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EP
European Patent Office
Prior art keywords
water
purification tank
water purification
pipe
tank according
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
EP88401502A
Other languages
English (en)
French (fr)
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EP0296064B1 (de
Inventor
Alain Holcblat
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.)
Areva NP SAS
Original Assignee
Framatome SA
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 Framatome SA filed Critical Framatome SA
Publication of EP0296064A1 publication Critical patent/EP0296064A1/de
Application granted granted Critical
Publication of EP0296064B1 publication Critical patent/EP0296064B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • 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
    • F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
    • F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators

Definitions

  • the subject of the present invention is a steam generator water purification tank.
  • the water in the secondary circuit contains particles which are mainly oxidation products such as magnetite. These particles tend to settle in areas with low flow velocity, and in particular near the tube plate, thus promoting corrosion of the exchange tubes.
  • the inventions of these three patents relate to purification tanks placed on the horizontal roof of an envelope containing the tubes in which the primary fluid circulates.
  • the water from the secondary circuit of the steam generator which is the subject of purification, circulates between the shell of the steam generator and the envelope of the tube bundle downwards, then inside the envelope towards the top ; it then vaporizes on contact with the tubes and rises in vertical pipes piercing the roof of the envelope.
  • Various devices placed at the top of the steam generator, in the two-phase zone make it possible to dry the steam produced by separating it from the water it still contains. Such devices are cyclones that act by centrifugation and herringbone dryers.
  • This water separated from the vapor phase, is more charged with particles than the water in the water returns or at the bottom of the beam because the boiling concentrates the solid particles in non-vaporized water.
  • it flows to a purification tank located on the roof of the bundle envelope where it settles before being recycled. The particles are deposited at the bottom of the tank, and they are thus left to remain until the tank is drained.
  • These purges can take place between two operating cycles or during a cycle using a special device comprising a water spray hose and a purge or draw pipe.
  • the purification tank is open at the top; its bottom is formed by the roof of the envelope and its side wall is vertical cylindrical.
  • the water collects until it overflows and cascades over the top edge of the side wall. It is then recycled.
  • the purge is ensured by a withdrawal pipe opening into the center of the bottom of the tank.
  • This device has the following drawback: as the cyclones and the dryers are distributed over the entire surface of the steam generator, the side wall of the tank must be of large diameter, in practice almost as large as that of the shell of the generator. steam itself, to be able to encompass all the runoff paths of the water separated from the steam. As a result, a very large plate must be moved and installed in the upper parts of the steam generator which are difficult to access during construction.
  • the second patent proposes a lighter solution since the single container is replaced by small closed containers whose top is perforated. These tanks are placed entirely in the liquid phase. The particle-laden water passes over them and part of it enters. As the flow speed is very low inside, the particles settle at the bottom of the tanks.
  • the racking device is completed by a device sprinkler consisting of a pipe entering the tank from its top and terminated by radial nozzles spraying its interior like a shower head.
  • the envelope which contains the bundle of tubes has a triple apex in the form of three parallel horizontal plates.
  • the upper plate is perforated
  • the middle plate includes a central orifice and does not extend radially to the periphery of the envelope
  • the lower fluid-tight plate corresponds to the roof of the envelope.
  • the water to be purified circulates, as in the previous solution, above the upper perforated plate and penetrates through it. It goes towards the central orifice of the middle plate which it therefore also crosses downwards. It then enters a baffle device which guarantees a laminar flow conducive to the deposition of particles; the water then circulates towards the periphery of the envelope and is recycled after having made a vertical movement which causes it to pass externally to the middle plate and through the peripheral holes of the perforated plate. In this device, no particular means of purging or drawing off is provided.
  • the object of the invention is to avoid these various drawbacks and more particularly the drawback associated with perforated covers which do not guarantee a good performance of the treatment tank.
  • a particular object of the invention is therefore to propose a purification tank which is practically a closed envelope, with the exception of orifices, possibly small, used for the evacuation, and of an upper chimney allowing a pipe in which flows the water loaded with particles to lead into the tank.
  • the invention relates to a water purification tank circulating in a steam generator, separated from the steam by means of dryers and having flowed into a water supply pipe into the tank, characterized in that 'It includes an envelope consisting of a bottom, a side wall pierced with water discharge orifices and a roof pierced with a central chimney into which penetrates the lower end of the pipe.
  • the invention can also be applied to certain steam generators, the construction of which requires that the water contained in the tank may be rapidly available for cooling purposes. Under these conditions, the orifices are extended by vertical slots extending towards the bottom and thus possibly allowing rapid and almost complete emptying of the tank.
  • the purging device comprises a water spray pipe tangent to the bottom, passing through a median line of this bottom and pierced with holes allowing sprinkling tangent to the bottom, as well as a collecting pipe communicating with the tank by fittings passing through said tank near the junction of its bottom and its side wall.
  • the primary water circulates according to the arrows A: it first penetrates inside the bottom of the casing 1 by a primary inlet pipe 2 and circulates inside inverted U-shaped tubes 3, the end of the branches is planted in a tubular plate 4.
  • the primary water leaves the tubes 3 to leave the steam generator by a primary outlet pipe 5.
  • a separator plate 6 is formed between the tubular plate 4 and the enclosure 1 of the steam generator so as to force the primary fluid to pass through the tubes 3.
  • the secondary water circulates according to the arrows B, C and D. It firstly penetrates inside the enclosure 1 of the steam generator by a secondary inlet pipe 19 supplemented by a supply device not shown here.
  • the liquid phase water flows down the steam generator, between the enclosure 1 and an envelope 7 inside thereof, which is concentric with it and which includes the tubes 3.
  • the secondary water is stopped by the tube plate 4 and then flows radially towards the interior of the steam generator passing through openings 8 formed between the bottom of the envelope 7 and the tube plate 4.
  • the secondary water then rises, is reheated on contact with the tubes 3 and vaporizes partially.
  • the circulation of wet steam is more particularly represented by the arrows C: the water-steam mixture rises towards the roof 9 of the casing 7, which is also the bottom of the purification tank which will be described below. , and circulates in vertical pipes 10 communicating with the interior of the casing 7 through holes in which the roof 9 is pierced.
  • the water-steam mixture rises towards the top of the steam generator 1, but it is still very loaded with moisture. This is why there are devices for separating steam and water.
  • cyclones 11 are provided at the top of the tubes 10 which operate a first separation of the water droplets suspended in the vapor by centrifugation. The water thus collected passes through collecting devices 12 and then flows by gravity (downwards), along the pipes 10 outside of them until reaching the liquid / vapor interface H.
  • the tops of the cyclones are braced by a solid plate 44, equipped with drains 13 which serve to evacuate the droplets not separated by the cyclones and falling by gravity.
  • These drains 13 can open onto the vertical drain 20 which itself opens into a purification tank 30 described below. In this case, the water separated by gravity is purified by the device proposed by the inventor.
  • the wet steam continues to rise according to the arrows C until it leaves the enclosure 1 of the steam generator by a secondary outlet pipe 14, but in the meantime it passes through the dryers 15, which are structures suspended at the top of the envelope 1 and in which the droplets contained in the vapor and not centrifuged by the cyclones 11 are captured by corrugated sheets.
  • This residual water is loaded with solid particles which must undergo purification. This water can even entrain particles which detach from these sheets following an accidental oxidation during a stop.
  • the water from the dryers is more charged than the water recirculated by the cyclones, and the proposed device has the advantage of purifying the water from the dryers before it mixes with the rest of the recirculated water.
  • the droplets flow by gravity, first along the dryers 15, then inside a collection tank 16 suspended from the dryers 15 where they collect, and finally inside a vertical drain 20 which collects the water from the collection tank 16 and possibly that which falls from the drains 13.
  • the path of this water is represented by the arrows D.
  • the drain 20 opens at its lower end 21 into a purification tank 30 located below the liquid-vapor interface H, which constitutes the object of the invention and will now be described in detail.
  • the purification tank 30 is of generally cylindrical shape and comprises a bottom 9 here merged with the roof of the envelope 7, a side wall 31 and a roof 32.
  • the bottom 9 and the roof 32 can be crossed, in the case of a large diameter tank 30, by the vertical pipes 10 which convey the water-steam mixture.
  • the roof 32 is pierced with a chimney 33 consisting of a cylindrical sleeve placed in the center of the roof 32.
  • the drain 20 penetrates into the interior of the chimney 33 and makes with the sleeve a slight clearance in order to tolerate thermal expansions and location uncertainties due to manufacturing.
  • the chimney 33 is obstructed by a grid 34 which rests on the roof 32.
  • the lower end 21 of the drain 20 is above the grid 34.
  • the utility of the grid 34 is to create pressure losses of the water flowing in the drain 20 and in particular to rapidly reduce the vertical component of its speed.
  • the same result can be achieved by means of a drain 20 ′ penetrating more deeply into the purification tank 30 and whose lower end 21 ′ is clearly at below the roof 32.
  • the section of the drain 20 ′ is not open but obstructed by a plate 29, and the flow of water out of the drain 20 ′ is made radially by orifices 22 drilled in the circumference of the drain 20 ′, under the roof 32.
  • the water entering the drain 20 -or 20′- in the purification tank 30 loses its polluting particles in suspension by depositing them on the bottom 9. This is achieved by creating a flow that is as laminar and calm as possible, especially at the bottom of the tank 30, which allows not to entrain again the particles already deposited.
  • Evacuation orifices 35 regularly distributed along the side wall 31 and at the same level in the upper part thereof ensure a radial flow of the water meeting these characteristics.
  • the radial flow allows the water entering the purification tank 30 to be slowed down very sharply, and the long transit time promotes the deposition of particles on the bottom 9.
  • the lower part of the tank 30 is little affected by the flow and therefore constitutes a calm zone.
  • the purified water leaving through the orifices 35 then mixes with the general flow represented by the arrows B.
  • the purification tank 30 according to the invention therefore has various advantages over the solutions known and disclosed in the patents mentioned.
  • the closed nature of the device makes it possible to maintain the same efficiency whatever its environment, and in particular if the tank 30 is entirely in the liquid phase.
  • a spray hose 40 passes inside the purification tank 30 and on the bottom 9.
  • the spray hose 40 is straight in the purification tank 30 and arranged in a central or diametral course. It is pierced with horizontal spraying orifices 41, thus allowing a flow of spraying water which is horizontal and tangent to the bottom 9 when purging.
  • the particles flow in the form of mud, repelled by the spraying water towards the periphery of the purification tank 30. It then passes through fittings 42 arranged along the side wall 31 and near the bottom 9, and which communicate the interior of the purification tank 30 with a recuperator pipe 43 of annular shape around the side wall 31 outside of the latter. The mud can then be vacuumed and collected.
  • suction pipes 40 and recuperator 43 do not pass through either the casing 7 or the enclosure 1, but are bent upwards and open above the interface H near a hole secondary man 50. When the operation of the steam generator is interrupted, it is thus easy to open the cover of the manhole 50 and to connect the sprinkler and recovery pipes 40 and 43 to pumps.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Separation Of Particles Using Liquids (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
EP88401502A 1987-06-18 1988-06-16 Wasserreinigungsbehälter mit einem Dampferzeuger Expired - Lifetime EP0296064B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8708517 1987-06-18
FR8708517A FR2616883B1 (fr) 1987-06-18 1987-06-18 Bac d'epuration d'eau de generateur de vapeur

Publications (2)

Publication Number Publication Date
EP0296064A1 true EP0296064A1 (de) 1988-12-21
EP0296064B1 EP0296064B1 (de) 1992-03-18

Family

ID=9352191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401502A Expired - Lifetime EP0296064B1 (de) 1987-06-18 1988-06-16 Wasserreinigungsbehälter mit einem Dampferzeuger

Country Status (8)

Country Link
US (1) US4898123A (de)
EP (1) EP0296064B1 (de)
JP (1) JPS6488007A (de)
KR (1) KR890000834A (de)
CN (1) CN1011333B (de)
DE (2) DE3869224D1 (de)
ES (1) ES2006448T3 (de)
FR (1) FR2616883B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999013268A1 (en) * 1997-09-08 1999-03-18 Vattenfall Ab (Publ) A device for steam generators
FR2909161A1 (fr) * 2006-11-24 2008-05-30 Babcock & Wilcox Canada Ltd Systeme collecteur de boues a tambour a boues et generateur de vapeur a recirculation
EP2246616A1 (de) * 2008-02-29 2010-11-03 Mitsubishi Heavy Industries, Ltd. Dampferzeuger

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2705759B1 (fr) * 1993-05-27 1995-07-07 Framatome Sa Générateur de vapeur équipé d'un dispositif de piégeage de corps migrants.
FR2789128B1 (fr) * 1999-01-29 2001-04-20 Framatome Sa Procede et dispositif de conduite d'une turbomachine de maniere a limiter l'encrassement de parties internes de la turbomachine par des salissures provenant du gaz de procede
FR2789127B1 (fr) * 1999-01-29 2001-04-20 Framatome Sa Procede et dispositif d'enlevement de salissures dans une partie interne d'une turbomachine, pendant le fonctionnement de la turbomachine
CN1092967C (zh) * 1999-12-31 2002-10-23 岳云春 治疗婴幼儿单纯性腹泻的散剂
KR100487845B1 (ko) * 2002-07-25 2005-05-06 주식회사 엘지화학 프로필렌 기상 부분산화반응용 촉매 조성물 및 그것의 제조방법
KR100561073B1 (ko) * 2004-02-25 2006-03-17 주식회사 엘지화학 기상 부분 산화 반응용 촉매 및 그의 제조방법
US7993426B2 (en) * 2006-08-28 2011-08-09 Mitsubishi Heavy Industries, Ltd. Moisture separator
CN101691259B (zh) * 2009-10-20 2012-03-21 昆明碧真环保科技有限公司 一种防垢质及其防垢除垢方法
CN109681858A (zh) * 2019-01-30 2019-04-26 中广核工程有限公司 一种用于压水堆核电站蒸汽发生器的泥渣收集装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664069A (en) * 1984-12-24 1987-05-12 Combustion Engineering, Inc. Removal of suspended sludge from nuclear steam generator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2507742A1 (fr) * 1981-06-16 1982-12-17 Commissariat Energie Atomique Generateur de vapeur muni d'un dispositif de purge dynamique
FR2573320B1 (fr) * 1984-11-20 1989-06-30 Delas Weir Sa Dispositif de degazage d'un fluide liquide
US4762091A (en) * 1984-12-03 1988-08-09 Westinghouse Electric Corp. Sludge trap with internal baffles for use in nuclear steam generator
KR910002216B1 (ko) * 1985-03-29 1991-04-08 가부시끼가이샤 도시바 습분분리 재열장치

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664069A (en) * 1984-12-24 1987-05-12 Combustion Engineering, Inc. Removal of suspended sludge from nuclear steam generator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999013268A1 (en) * 1997-09-08 1999-03-18 Vattenfall Ab (Publ) A device for steam generators
FR2909161A1 (fr) * 2006-11-24 2008-05-30 Babcock & Wilcox Canada Ltd Systeme collecteur de boues a tambour a boues et generateur de vapeur a recirculation
EP2246616A1 (de) * 2008-02-29 2010-11-03 Mitsubishi Heavy Industries, Ltd. Dampferzeuger
EP2246616A4 (de) * 2008-02-29 2015-04-08 Mitsubishi Heavy Ind Ltd Dampferzeuger

Also Published As

Publication number Publication date
US4898123A (en) 1990-02-06
CN1011333B (zh) 1991-01-23
CN1030469A (zh) 1989-01-18
FR2616883A1 (fr) 1988-12-23
DE296064T1 (de) 1989-06-01
ES2006448A4 (es) 1989-05-01
EP0296064B1 (de) 1992-03-18
JPS6488007A (en) 1989-04-03
DE3869224D1 (de) 1992-04-23
FR2616883B1 (fr) 1990-03-30
KR890000834A (ko) 1989-03-16
ES2006448T3 (es) 1992-10-16

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