WO1999013268A1 - A device for steam generators - Google Patents
A device for steam generators Download PDFInfo
- Publication number
- WO1999013268A1 WO1999013268A1 PCT/SE1998/001569 SE9801569W WO9913268A1 WO 1999013268 A1 WO1999013268 A1 WO 1999013268A1 SE 9801569 W SE9801569 W SE 9801569W WO 9913268 A1 WO9913268 A1 WO 9913268A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- nozzle
- cup
- cup part
- steam
- area
- Prior art date
Links
Classifications
-
- 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
- F22B37/22—Drums; Headers; Accessories therefor
Definitions
- This invention relates to a device for steam genera- tors of the type which in a roof-forming upper part comprises a nozzle having the purpose of leading water steam out from the interior of the generator in a subsequent outlet pipe and in conjunction with this bringing about pressure recovery, and which has an inlet neck with a smallest hole area from which an upwardly diverging cavity extends, forming a transition to the outlet pipe, as well as a guide surface widening downwards and having an arched, trumpet-like shape which forms a transition to a lower surface on said upper part.
- An undisputed factor, which contributes to the emergence of unstable flows, is constituted by the so called separation in association with the diverging, usually cone- shaped wall surface in the nozzle.
- a primary object of the invention is to provide a device which, with simple and inexpensive means, can counteract irregularities in the inlet flow of the steam to the nozzle with the ultimate purpose of eliminating the risk for unstable flows in the outlet pipe and other parts of the flow-carrying structure.
- Another object is to provide a device which not only may be integrated in newly built steam generators, but also be mounted afterwards in existing steam generators .
- Fig 1 is a vertical section through the upper part of a steam generator together with a nozzle included therein and a device according to the invention mounted in association therewith
- Fig 2 is a planar view from below in fig 1 illustrating a first embodiment of the device according to the invention
- Fig 3 is an analogous planar view showing a second, alternative embodiment
- Fig 4 and 5 are partial views from below showing two further alternative embodiments of the device according to the invention
- Fig 6 is a section corresponding to fig 1 showing a further alternative embodiment of the device.
- Fig 7 is a perspective exploded view of the device shown in fig 6.
- numeral 1 generally designates a roof-forming upper part of a steam generator which is not closer shown in other respects.
- a nozzle designated 2 is included in this roof part.
- an outgoing angularly shaped pipe 3 is connected to the nozzle 2.
- Fluid in the form of water steam is fed with high speed (usually more than 100 m/sec) from the interior of the generator through the nozzle 2 and further on through the outgoing pipe, as is outlined by the arrows.
- the nozzle includes a diverging cavity 4, which in the example is assumed to have a cut down cone-shaped basic shape, i.e. the cavity is delimited by a cone-shaped wall surface 5.
- inlet 6 In the area of the bottom part of the nozzle there is an inlet 6, most often denominated neck, having a smallest diameter.
- the cavity 4 widens on the downstream side of said neck.
- arched guide surface 7 which widens in a trumpet- like way from the neck in the direction to the interior of the steam generator. It should also be mentioned that the nozzle 2 is centrally placed in relation to the generator house.
- the neck 6 may have a diameter of the magnitude of 400 mm at the same time as the wider outlet mouth 8 may have a diameter of 550 mm.
- the cone angle of the cavity 6 may then amount to 15°.
- the pipe 3 may have an inner diameter of 750 mm, the thickness of the tube wall being within the range of 50-80 mm. It should also be pointed out that the inlet end of the pipe 3 is united to the outlet end of the nozzle by a circumfering weld 9.
- a cup-shaped part or structure 10 is arranged on the bottom side of the roof part 1, centrically placed in relation to the nozzle 2.
- Said cup-shaped part has a plurality of mutually separated openings 11 having the purpose of distributing the flow of water steam passing through the cup part in a plurality of part flows with the purpose of bringing about an even or homogeneous main flow through the nozzle. These openings may be uniformly distributed.
- the cup part 10 is in the shape of a lattice work in which the openings 11 are wedge-shaped and defined between long narrow elements 12 extending between a central area and a peripherical area of the cup part.
- the individual elements 12 are at their interior ends jointly connected by means of a central hub-like member 13 having at least some radial extension. At their outer ends, the elements 12 are directly connected to the lower surface 14 on the roof part 1. In other words, the free end of each element is pointwisely united to the roof part, e.g. by means of welding. This means that the flow of steam is not disturbed in the area between two adjacent element ends, in that the surface 14 there is smooth.
- the elements 12 in the embodiment according to fig 1 and 2 are radially directed and equidistantly placed. In this case, ten long narrow elements are included in the device, the angle between adjacent elements throughout being 36°.
- the cup part 10 composed of the elements 12 has an arched shape.
- this arched shape is not spherical but rather determined of a bending radius that is largest in the central area so as to thereafter successively decrease in the direction towards the periphery.
- the water steam will flow in in a similar way irrespective of the direction of flow. Therefore, a peripheral flow which sweeps under the bottom side of the roof part will meet the geometric arch of the cup part at an angle of approximately 90° similar to a central flow in the direction vertically from below.
- the embodiment according to fig 3 differs from the embodiment according to fig 2 only in that the elements 12 at the interior ends thereof extend tangentially out from the hub member 13 made as a trundle. By the fact that the elements are positioned in this way, the device will also operate as a rotary producer which applies at least some rotary movement to the passing flow of steam before it enters the nozzle.
- the long narrow elements 12 which together forms a cup-shapedly arched lattice are shown only schematically in the shape of evenly thick bars.
- the cross-section shape of the individual element may be realized in many different ways.
- the elements may, for instance, be made as wings having a flattened cross-section shape .
- fig 4 and 5 schematically illustrate how the cup part 10 may also be in the shape of an arched sheet-metal plate or board in which a plurality of holes 11' are recessed which form the steam distributing openings. In the two the embodiments, these holes 11' are arranged in a plurality of ring-shaped sets which are radially separated.
- the holes should be confor- mal and of the same size as well as be equidistantly placed.
- the holes 11' in the outer ring set are somewhat larger than the holes in the outermost but one set, and then the holes in the sets being inside thereof successively decreases in size.
- the flow will be distributed in a plurality of equivalent part flows which after passage is reintegrated in a continuous main flow being substantially homogeneous or conformal irrespective of the flow taking place linearly or with some rotary movement. This counteracts the risk for separation along the nozzle wall and thereby the risk for emergence of unstable flows in the nozzle together with the subsequent pipe.
- the arched, substantially cap-shaped cup part 10 is composed of a plurality of wedge-shapedly tapering, sector-shaped part boards 15 each one which having an arched shape.
- these part boards may consist of sheet- metal plates which along converging side edges has bent flanges 16 which may be interconnected by means of suitable joints, e.g. welding or screw oints.
- suitable joints e.g. welding or screw oints.
- a number of holes 17 are outlined in the drawing for screw joints which are schematically illustrated by a screw 18 and a nut 19.
- radially separated sets of holes 11" are provided.
- tne hole ⁇ which are located on one hand closest to the peripheral edge of * ⁇ e part board and on the other hand near tne taperj ng tip of the board are smaller than the holes which are placed in the area approximately halfway between the peripheral edge and the tip, respectively.
- curve graph A in fig 6 these varying hole sizes result m the fact that the share of holes per surface unit becoming largest in an area between the centre and periphery of the cup part.
- this hole area distribution entails that the liquid flow becomes larger in a ring area, the diameter of which occurs within the range of 40-70 % of the outer diameter of the cup part. This is something which has shown to give an optimally stable main flow through the nozzle.
- the cup part made in the shape of a lattice may be made in another way than those which are exemplified in fig 2 and 3.
- individual, substantially radial elements may be mutually united by means of rings having different diameters instead of by a central hub member.
- the lattice may also have a net-like character or be provided similar to a floor board lattice.
- the board-shaped basic embodiment according to fig 4 and 5 may be modified in many ways, above all in respect of the choice of shapes and dimensions of the individual, small holes.
- the holes in the external, peripheral set of holes may also be outwardly open instead of being concluded at some distance inside the peripheral edge of the arched board.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98943142A EP1021680A1 (en) | 1997-09-08 | 1998-09-04 | A device for steam generators |
AU91000/98A AU9100098A (en) | 1997-09-08 | 1998-09-04 | A device for steam generators |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9703218-9 | 1997-09-08 | ||
SE9703218A SE9703218L (en) | 1997-09-08 | 1997-09-08 | Steam outlet device with nozzle and distribution cup, located in the roof of a steam generator |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999013268A1 true WO1999013268A1 (en) | 1999-03-18 |
Family
ID=20408163
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1998/001569 WO1999013268A1 (en) | 1997-09-08 | 1998-09-04 | A device for steam generators |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1021680A1 (en) |
AU (1) | AU9100098A (en) |
SE (1) | SE9703218L (en) |
WO (1) | WO1999013268A1 (en) |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB341532A (en) * | 1929-10-18 | 1931-01-19 | Frederick Knox Ouseley Moynan | Improvements in steam dryer, or grit and dust extractor from air or gases and the like |
DE2104355A1 (en) * | 1970-02-02 | 1971-10-21 | Westinghouse Electric Corp | Device for separating water or other loads from flowing vapors and gases |
CH582852A5 (en) * | 1973-11-21 | 1976-12-15 | Kraftwerk Union Ag | |
DE2751297A1 (en) * | 1976-11-24 | 1978-06-01 | Combustion Eng | CENTRIFUGAL STEAM WATER SEPARATOR FOR STEAM GENERATORS |
US4166477A (en) * | 1975-06-26 | 1979-09-04 | Bertin & Cie | Discharge conduits of steam generators and the like |
EP0023808A2 (en) * | 1979-07-25 | 1981-02-11 | Westinghouse Electric Corporation | Nuclear steam generator |
EP0055413A1 (en) * | 1980-12-29 | 1982-07-07 | Combustion Engineering, Inc. | Orificing of steam separators for uniform flow distribution in riser area of steam generators |
US4530212A (en) * | 1982-11-02 | 1985-07-23 | Kraftwerk Union Aktiengesellschaft | Turbine condenser with at least one bypass steam inlet leading into the steam dome |
US4602925A (en) * | 1984-12-27 | 1986-07-29 | Westinghouse Electric Corp. | Moisture separator |
EP0296064A1 (en) * | 1987-06-18 | 1988-12-21 | Framatome | Steam generator comprising a water purification tank |
SE502765C2 (en) * | 1991-09-03 | 1996-01-08 | Vattenfall Utveckling Ab | Separator |
-
1997
- 1997-09-08 SE SE9703218A patent/SE9703218L/en not_active IP Right Cessation
-
1998
- 1998-09-04 WO PCT/SE1998/001569 patent/WO1999013268A1/en not_active Application Discontinuation
- 1998-09-04 EP EP98943142A patent/EP1021680A1/en not_active Withdrawn
- 1998-09-04 AU AU91000/98A patent/AU9100098A/en not_active Abandoned
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB341532A (en) * | 1929-10-18 | 1931-01-19 | Frederick Knox Ouseley Moynan | Improvements in steam dryer, or grit and dust extractor from air or gases and the like |
DE2104355A1 (en) * | 1970-02-02 | 1971-10-21 | Westinghouse Electric Corp | Device for separating water or other loads from flowing vapors and gases |
CH582852A5 (en) * | 1973-11-21 | 1976-12-15 | Kraftwerk Union Ag | |
US4166477A (en) * | 1975-06-26 | 1979-09-04 | Bertin & Cie | Discharge conduits of steam generators and the like |
DE2751297A1 (en) * | 1976-11-24 | 1978-06-01 | Combustion Eng | CENTRIFUGAL STEAM WATER SEPARATOR FOR STEAM GENERATORS |
EP0023808A2 (en) * | 1979-07-25 | 1981-02-11 | Westinghouse Electric Corporation | Nuclear steam generator |
EP0055413A1 (en) * | 1980-12-29 | 1982-07-07 | Combustion Engineering, Inc. | Orificing of steam separators for uniform flow distribution in riser area of steam generators |
US4530212A (en) * | 1982-11-02 | 1985-07-23 | Kraftwerk Union Aktiengesellschaft | Turbine condenser with at least one bypass steam inlet leading into the steam dome |
US4602925A (en) * | 1984-12-27 | 1986-07-29 | Westinghouse Electric Corp. | Moisture separator |
EP0296064A1 (en) * | 1987-06-18 | 1988-12-21 | Framatome | Steam generator comprising a water purification tank |
SE502765C2 (en) * | 1991-09-03 | 1996-01-08 | Vattenfall Utveckling Ab | Separator |
Non-Patent Citations (1)
Title |
---|
DERWENT'S ABSTRACT, No. 82-06279J/49, week 8249; & SU,A,901 724 (KUKUSHKINA V F) 5 February 1982. * |
Also Published As
Publication number | Publication date |
---|---|
SE9703218D0 (en) | 1997-09-08 |
SE509216C2 (en) | 1998-12-21 |
AU9100098A (en) | 1999-03-29 |
SE9703218L (en) | 1998-12-21 |
EP1021680A1 (en) | 2000-07-26 |
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