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WO1998046326A1 - Dispositif d'aspiration et procede de filtration de particules d'un fluide - Google Patents

Dispositif d'aspiration et procede de filtration de particules d'un fluide Download PDF

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Publication number
WO1998046326A1
WO1998046326A1 PCT/DE1998/000938 DE9800938W WO9846326A1 WO 1998046326 A1 WO1998046326 A1 WO 1998046326A1 DE 9800938 W DE9800938 W DE 9800938W WO 9846326 A1 WO9846326 A1 WO 9846326A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
basket
sieve
flow
suction
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.)
Ceased
Application number
PCT/DE1998/000938
Other languages
German (de)
English (en)
Inventor
Johann Meseth
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
Siemens Corp
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
Publication of WO1998046326A1 publication Critical patent/WO1998046326A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/902—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/02—Combinations of filters of different kinds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0091—Including arrangements for environmental or personal protection
    • B01D46/0094—Including arrangements for environmental or personal protection against radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/20—Combinations of devices covered by groups B01D45/00 and B01D46/00
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/28—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core
    • G21C19/30—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps
    • G21C19/307—Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products deterioration or corrosion products, impurities, e.g. by cold traps specially adapted for liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/188—Multiple filtering elements having filtering areas of different size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
    • B01D2273/28—Making use of vacuum or underpressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to a suction device and a method for filtering particles from a fluid, in particular from a cooling liquid, which is sucked from a chamber into a suction line in a nuclear power plant.
  • a coolant is supplied to the reactor for cooling.
  • coolant is drawn in from a condensation chamber via a suction or fluid line and pumped into the reactor pressure vessel. It must be ensured that dirt particles, for example insulating material, which can get into the condensation chamber in the event of a loss of coolant, do not impair the suction of the coolant from the condensation chamber.
  • the first-mentioned object is achieved according to the invention by an intake device of a cooling system of a nuclear power plant with an intake line which is connected to the reactor pressure vessel of the nuclear power plant and into one in one Fluid located in the chamber opens, a filter device being provided in the chamber at the end of the suction line.
  • the filter device has a strainer basket which extends into the suction line along a longitudinal axis thereof and which has an opening for the fluid to flow into the suction line and a cross-sectional area perpendicular to the longitudinal axis which is smaller than the cross-sectional area of the suction line. Means are provided which cover the differential area of the two cross-sectional areas in such a way that the entire fluid flows through the opening into the screen basket.
  • the strainer basket is spaced from at least one wall area of the flow channel.
  • An outer space is formed between the strainer basket and the flow channel, into which the fluid, in particular cooling water, can flow through the side surface of the strainer basket.
  • the strainer basket has an opening for the inflow of the fluid and a strainer plate at its end located in the direction of flow.
  • the strainer basket serves as a sort of collecting container for particles carried in the fluid over almost its entire length, without the flow resistance for the fluid changing significantly, so that large quantities of particles can be filtered out of the fluid.
  • the capacity of the screen basket i.e. the amount of material or particles that the strainer basket can accommodate is increased by compressing the deposited particles in the strainer basket due to the dynamic pressure exerted by the flowing fluid. This makes a decisive contribution to the sieve basket remaining functional for a long time and being able to filter out a large amount of particles from the fluid.
  • the means provided to cover the differential area of the two cross-sectional areas, due to which the fluid has to flow completely through the strainer basket, can form a cross-sectional widening for the flowing fluid, for example, in the area of the opening.
  • the cross-sectional expansion causes turbulence to develop immediately behind it and a backflow area to form.
  • the fluid flows in the backflow region along vortex lines outward through the side wall of the strainer basket towards the wall of the flow channel. On the wall, the fluid flows back against its main flow direction in the direction of the cross-sectional widening and from there through the side wall of the strainer basket inwards. In this backflow area, the fluid flows through the side surface of the screen basket in the area of the cross-sectional widening from the outside inwards, so that clogging of the screen basket is effectively avoided.
  • the decisive advantage of the suction device is that, particularly in the event of a loss of coolant, the suction of cooling water from a chamber in the reactor pressure container is guaranteed.
  • the flow resistance for the fluid is largely unaffected by the filtered particles. This ensures sufficient cooling of the reactor pressure vessel.
  • the filter device has a flow segment with an inflow channel for inflowing the fluid into the strainer basket, as a result of which suitable flow conditions are achieved, e.g. a suitable flow velocity or a suitable flow profile, which ensure a high filter effect.
  • the inflow channel is advantageously aligned with the strainer basket, i.e. the inflow channel passes continuously into the strainer.
  • Inflow channel and strainer basket have the same flow cross-section. This arrangement favors the creation of a backflow area after the inflow channel.
  • strainer basket and / or the inflow channel are cylindrical.
  • the inflow channel is designed as an annular channel, as a result of which an internal backflow region is created in the direction of flow downstream of the annular channel, directly behind the central region enclosed by the annular channel.
  • the lead segment has a sieve structure.
  • the ring channel advantageously encloses a part of the sieve structure, in particular a preliminary sieve basket, so that particles are filtered out in the preliminary segment.
  • the flow strainer basket clogs, so that it forms a largely cylindrical mandrel, which is enclosed by the annular channel and cannot be flowed through by the fluid. The fluid flows in this case completely through the ring channel surrounding the mandrel.
  • the leading segment advantageously also has a sieve structure, for example, also on the outer boundary of the ring channel.
  • a sieve structure for example, also on the outer boundary of the ring channel. This is, for example, a cylindrical tube with sieve holes.
  • a coarse sieve is upstream of the sieve basket in terms of flow technology, as a result of which coarse and large-area particles are retained before the fluid flows into the sieve basket.
  • the feed segment is surrounded by the coarse sieve, so that the fluid flows from all sides through the coarse sieve into the feed segment and from there into the sieve basket.
  • the total area of the filter device is increased by the arrangement of the coarse screen in front of the screen basket, as a result of which larger amounts of dirt are retained by the filter device and the clogging of the filter device is thus effectively delayed.
  • the strainer basket advantageously comprises a plurality of sieve inserts which are arranged one inside the other and which can be displaced relative to one another along the longitudinal axis.
  • the strainer basket can simply be inserted into an already existing fluid line in a condensation chamber of a nuclear power plant and then telescopically pushed apart to enlarge the strainer area.
  • the suction device is preferably arranged in a condensation chamber of a boiling water nuclear power plant.
  • the suction device is not limited to the arrangement in a boiling water nuclear power plant, but can also, for example, be connected to the condensation chamber in a comparable chamber of a pressurized water nuclear power plant.
  • the object directed to the method is achieved according to the invention by a method for filtering particles from a fluid located in a chamber of a nuclear power plant, in which the fluid flows from the chamber into the reactor pressure vessel of the nuclear power plant via an intake line opening into the chamber.
  • the fluid is passed through a filter device arranged at the end of the suction line in the chamber and flows completely through a filter basket of the filter device which extends axially and in particular is cylindrical in the suction line.
  • vortices are generated in the fluid by means of a cross-sectional widening, so that particles are washed away from the side wall of the screen basket.
  • 1 shows a schematic cross section of a filter device for explaining the flow conditions; 2 also shows a schematic cross section of a filter device in which a fluid flows through an annular channel into a screen basket;
  • Filter device in a schematic view
  • 5 shows a schematic view of an end piece of an intake line on which a filter device with a screen basket, a feed segment and a coarse screen are arranged
  • 6 shows a schematic view of a section through the
  • Coarse sieve from Figure 5; 7 shows a simplified illustration of a section of a boiling water reactor system with a suction device.
  • the same reference numerals are assigned the same meaning in the individual figures.
  • the filter device 1 has a strainer basket 2 arranged in an intake line designated as a flow channel 6 and a flow segment 4 upstream of the flow channel 6.
  • the strainer basket 2 extends along a longitudinal axis 8 in the flow channel 6.
  • the flow segment 4 opens into the flow channel 6.
  • the flow segment 4 according to FIG. 1 can also be regarded as a line section or inflow channel 4a upstream of the flow channel 6. This upstream line section is, for example, a pipe.
  • a fluid f in particular cooling water, can flow through the flow segment 4 via an opening 7 into the strainer basket 2 and through it into the flow channel 6.
  • the main flow direction x of the fluid f coincides with the direction of the longitudinal axis 8.
  • the strainer basket 2 and the lead segment 4 each have a cross-sectional area al of the same size, oriented perpendicular to the longitudinal axis 8, which is smaller than the cross-sectional area a2 of the flow channel 6.
  • the lead segment 4 merges into the strainer basket 2 without a step, i.e. the flow segment 4 is aligned with the strainer basket 2.
  • the direct connection of the strainer basket 2 to the flow segment 4 ensures that the fluid f which flows into the flow channel 6 through the flow segment 4 flows completely through the strainer basket 2.
  • the strainer basket 2 has a side wall 12 and a strainer plate at its end in the direction of flow of the fluid f the 10th.
  • the screen basket 2 is cylindrical, for example. Its sieve surface, namely the surface of the sieve plate 10 together with the surface of the side wall 12, is formed, for example, from a perforated sheet or a wire mesh. Alternatively, the sieve plate 10 can also be designed impermeable to the fluid.
  • Flow lines 13 of the fluid f are shown in FIG. 1 to explain the mode of operation of the filter device 1. Due to the sudden cross-sectional widening 9 at the transition of the flow segment 4 into the flow channel 6, backflow vortices q1 occur in a return flow region 14.
  • the backflow region 14 is formed directly behind the cross-sectional widening 9, namely essentially between the side wall 12 of the screen basket 2 and the wall of the flow channel 6.
  • the fluid f flows downstream through the side wall 12 outwards, i.e. towards the wall 16 of the flow channel 6. Particles p entrained in the fluid f are retained by the strainer basket 2, so that only cleaned fluid flows in a, for example annular, outer space 17 between the strainer basket 2 and the flow channel 6. Immediately at the cross-sectional widening 9 there is a lower pressure, so that the cleaned fluid f flows again along the drawn vortex line of the return flow vortex ql in the direction of the flow segment 4 against the main flow direction x of the fluid f.
  • this cleaned portion of the fluid f again penetrates the side wall 12 from the outside, i.e. the fluid f flows through the side wall 12 in the direction of the longitudinal axis 8 and flushes the side wall 12 from the outside.
  • Dirt particles carried in the fluid f cannot therefore deposit on the side wall 12 in this area and the sieve basket 2 clog.
  • a deposit on the side wall 12 is also effectively avoided by the axial flow direction of the fluid f, ie in the direction of the longitudinal axis 8. Rather, particles p carried in the fluid f settle at the end of the sieve basket 2 on the sieve plate 10 and increasingly clog the sieve plate 10. As long as the latter is not completely blocked, the fluid f flows through both the sieve plate 10 and through the side wall 12. With increasing clogging of the sieve plate 10, the proportion of the fluid f flowing through the sieve plate 10 becomes smaller and smaller until finally all the fluid f flows through the side wall 12.
  • the side wall 12 can also clog with particles p. Due to the flow conditions, however, this only occurs in the area of the sieve plate 10 or at the point in the sieve basket 2 where the fluid f is forced to flow through the side wall 12 due to deposits.
  • a major advantage of this filter device 1 is that the strainer basket 2 gradually closes exclusively from the sieve bottom 10, so that fluid f can flow out through the side wall 12 at any time.
  • the sieve basket 2 forms a collecting vessel for particles p carried in the fluid, in which the particles p collect. As a result of the flowing fluid f, this collection of particles p has an indentation with a parabolic profile. Vertebrae q2 also form immediately in front of and behind this collection.
  • the flow resistance of the strainer basket 2 remains essentially unchanged, since the fluid f can flow out completely through the side wall 12 via the outer space 17 formed between the strainer basket 2 and the flow channel 6.
  • the flow resistance only changes significantly when the sieve basket 2 is almost completely filled with particles p.
  • the filter device 1 also achieves a particularly advantageous effect because the particles p in the Sieve basket 2 are compressed. Due to the flow of the fluid f, there is a high dynamic pressure in front of the sieve plate 10 or in front of the accumulation of particles p, which leads to the compression. As a result, the capacity of the screen basket 2 is increased, ie the amount of particles p collected in the screen basket 2 is increased.
  • the flow segment 4 has an annular channel 20 as the inflow channel 4a.
  • the screen basket 2 arranged in the flow channel 6 is aligned with the outer boundary 22 of the ring channel 20, so that it is ensured that the fluid f flowing through the ring channel 20 flows completely through the screen basket 2.
  • the outer diameter d1 of the ring channel 20 therefore corresponds to the diameter d2 of the, for example, cylindrical strainer basket 2 and is smaller than the diameter d3 of the for example tubular flow channel 6.
  • the cross-sectional widening 9 forms an inner backflow region 24 immediately following the flow segment 4.
  • the inner backflow area 24 is formed in particular behind the central, for example massive, area which is enclosed by the annular channel 20 and is referred to as the mandrel 25.
  • the two backflow areas 14, 24 prevent in the region of the transition from the flow segment 4 to the
  • the filter device 1 comprises a screen basket 2 arranged centrally in a flow channel 6, i.e. the
  • Sieve basket 2 is evenly spaced from wall 16 of flow channel 6. The fluid f can therefore flow into the flow channel 6 anywhere through the side wall 12 of the strainer basket 2.
  • the strainer basket 2 is arranged in the flow channel 6 with the aid of a flange 26.
  • Flange 26 can therefore be regarded as an insert for a flow channel 6.
  • the flange 26 is configured, for example, as a type of pinhole, so that the fluid f completely flows through the opening of the pinhole first into the strainer basket 2 and from there into the flow channel 6.
  • the strainer basket 2 is arranged asymmetrically, that is to say not centrally, in the flow channel 6.
  • the screen basket 2 is only spaced from a partial area of the wall 16 of the flow channel 6.
  • a partial area of the side wall 12 of the strainer basket 2 is formed by a partial area of the wall 16a of the flow channel 6.
  • the strainer basket 2, seen in section, is curved in an approximately S-shape.
  • the front curve 28a at its front end, i.e. At the end of the strainer basket 2 through which the fluid f flows in, an at least partial spacing of the strainer basket 2 from the wall 16 is ensured.
  • the strainer basket 23 has a smaller cross-sectional area al than the cross-sectional area a2 of the flow channel 6.
  • the strainer basket 2 is connected directly to the flow channel 6 in the area of the front curve 28a and in the area of a rear curve 28b. so that the fluid f must flow completely through the screen surface of the screen basket 2.
  • the two curvatures 28a, 28b form the means which ensure that the fluid f is completely guided through the screen basket 2, which also includes the two curvatures 28a, 28b.
  • the front curve 28a merges into the side wall 12 and the rear curve 28b into the sieve bottom 10.
  • the front curvature 28a is designed to be impermeable to the fluid f, so that a vortex flow is formed following the front curvature 28a, which prevents the side wall 12 from clogging.
  • FIG. 5 shows a section of an intake line, also referred to as flow channel 6, on the other side thereof
  • the filter device 1 has a coarse sieve 30 which corresponds to the nal 6 arranged screen basket 2 is connected upstream and includes the lead segment 4.
  • the fluid f which flows into the screen basket 2, first flows through the coarse screen 30. Bulky and large-volume particles p are thereby already retained by the coarse screen 30.
  • the fluid f passes through the feed segment 4 into the sieve basket 2 and flows through it into the flow channel 6.
  • the flow channel 6 typically has a diameter of approximately 0 .5 m on.
  • the screen basket 2 comprises three screen inserts 32a, b, c, which are arranged one inside the other and are displaceable relative to one another.
  • the screen inserts 32a, b, c each have a length of approximately 1.5 m to 1.6 m and a diameter of 0.38 m, 0.37 m and 0.36 m, for example.
  • the individual sieve inserts 32a, b, c are each spaced from the wall 16 of the flow channel 6, for example by spacers 34.
  • the strainer basket 2 in which the strainer inserts 32a, b, c are first telescopically pushed into one another, is inserted into the flow channel 6, and then the strainer inserts 32 are displaced relative to one another in the flow channel 6.
  • the fluid f flows into the strainer basket 2 from a flow segment 4 which has an annular channel 20.
  • Part of the lead segment 4 can be formed by one of the screen inserts 32a.
  • the sieve insert 32a with the largest diameter which belongs to a sieve structure 36 of the feed segment 4, forms the outer boundary 22 of the ring channel 20.
  • the ring channel 20 itself encloses a feed sieve basket 2a, which is also part of the sieve structure 36.
  • the screen structure 36 therefore includes an end piece of the screen insert 32a and the lead screen basket 2a.
  • the outer strainer insert 32a is fastened to an end flange 38 of the fluid line 6 by means of a flange 26.
  • the screen basket 2 and the screen structures 36, in contrast to the coarse screen 30, are referred to as fine screens.
  • fine screens for example, a perforated plate is used in which the individual holes have a diameter of, for example, 4 mm with a hole spacing of, for example, 6 mm, and the rows of holes are offset from one another.
  • the percentage of holes in the perforated plate is, for example, 40%.
  • the coarse screen 30 is also attached to the end flange 38.
  • it also has perforated plates as the sieve surface, with a hole diameter of 40 mm, with a hole spacing of 60 mm, the rows of holes being offset and the proportion of holes being 40%.
  • the coarse screen 30 is approximately cuboid and has, for example, an edge length of approximately 1.6 m.
  • a plurality of the perforated plates described are arranged in almost the entire volume of the coarse screen 30. The arrangement of the individual perforated plates is such that it is ensured that inflowing fluid f must flow through at least one perforated plate.
  • a large part of the particles p carried in the fluid f is already retained by the coarse sieve 30. Finer fractions reach the area of the leading segment 4.
  • the fluid f can initially flow into the flow channel 6 from all directions through the leading segment 4, since the ring channel 20 of sieve structures 36, namely a part of the outer sieve insert 32a of the sieve basket 2 and the leading sieve basket 2a , is formed.
  • the flow strainer basket 2a is largely encompassed by the ring channel 20.
  • the fluid f therefore flows, for example, from the outside through the sieve insert 32a into the ring channel 20.
  • the sieve insert 32a can in this area, in which it is part of the lead segment 4, be added over time with particles p.
  • the sieve structure 36 designed as a leading sieve basket 2a can clog over time. However, even in the event that all sieve structures 36 of the feed segment 4 are blocked, a sufficient flow path for the fluid f via the ring channel 20 to flow into the flow channel 6 remains open.
  • the advantage of the sieve structures 36 in the leading segment 4 is that an additional sieve surface is hereby created.
  • the filter device 1 described, with coarse sieve 30, feed segment 4 and sieve basket 2 has a large sieve area in order to collect even very large quantities of particles p, and thus to keep the flow path through the flow channel 6 open.
  • FIG. 6 shows a section along the line VI-VI in FIG. 5 through the coarse sieve 30.
  • FIG. 6 shows an example of an arrangement of the perforated plates in the coarse sieve 30.
  • the individual perforated sheets or rows of perforated sheets are arranged in such a way that, seen in cross section, they form triangular sieve surfaces 39.
  • triangular gussets 40 are also formed, which are suitable for collecting coarse material. These gussets 40 therefore serve to ensure the largest possible volume in the filter device 1 for collecting dirt particles.
  • the filter device 1 is arranged in a condensation chamber 42 of a boiling water nuclear power plant, which is shown very schematically.
  • the filter device 1 is arranged on a suction line 44 which opens into the condensation chamber 42.
  • the suction line 44 forms, together with the filter device 1, a suction device for conveying coolant c, for example water, into a reactor pressure vessel 46 of the boiling water nuclear power plant.
  • the condens sationshunt 42 and the reactor pressure vessel 46 are arranged in a safety vessel 48.
  • the suction device is part of a cooling system, in particular an emergency cooling system, with which adequate cooling of the reactor pressure vessel 46 is ensured.
  • a cooling system in particular an emergency cooling system, with which adequate cooling of the reactor pressure vessel 46 is ensured.
  • large amounts of coolant c which is free of impurities and particles p can be reliably introduced into the reactor pressure vessel 46.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Le dispositif d'aspiration comprend une conduite d'aspiration (44) au moyen de laquelle un fluide (f) provenant de préférence d'une chambre de condensation (42) d'une installation de réacteur à eau bouillante, est aspiré, en vue de son refroidissement, dans le récipient à pression du réacteur (46). A l'extrémité de la conduite d'aspiration (44) est monté un dispositif de filtration (1) présentant un panier-tamis longitudinal (2) s'étendant dans la conduite d'aspiration (44). Du fait de l'élargissement de la section (9), il se forme, lors de l'admission du fluide (f), des tourbillons empêchant un colmatage des parois latérales (12) du panier-tamis (2) par les particules (p) entraînées par le fluide (f). Les particules (p) se rassemblent à la base du tamis (10) du panier-tamis (2) qui est en mesure de recueillir une grande quantité de particules (p) sans que la résistance à l'écoulement en soit sensiblement modifiée.
PCT/DE1998/000938 1997-04-15 1998-04-02 Dispositif d'aspiration et procede de filtration de particules d'un fluide Ceased WO1998046326A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19715633 1997-04-15
DE19715633.9 1997-04-15

Publications (1)

Publication Number Publication Date
WO1998046326A1 true WO1998046326A1 (fr) 1998-10-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/000938 Ceased WO1998046326A1 (fr) 1997-04-15 1998-04-02 Dispositif d'aspiration et procede de filtration de particules d'un fluide

Country Status (1)

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WO (1) WO1998046326A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152582B (de) * 1956-11-30 1963-08-08 Rockwell Mfg Co Rohrleitungssieb
FR1600223A (fr) * 1968-12-31 1970-07-20
US4565631A (en) * 1982-12-17 1986-01-21 Taprogge Gesellschaft Mbh Backflow-type self-cleaning filter
EP0216729A1 (fr) * 1985-08-16 1987-04-01 Alusuisse-Lonza Services Ag Bougie filtrante de purification de gaz d'échappement de moteurs diesel
DE3842436A1 (de) * 1988-12-16 1990-06-21 Weinhold Karl Rohrleitungsfilter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1152582B (de) * 1956-11-30 1963-08-08 Rockwell Mfg Co Rohrleitungssieb
FR1600223A (fr) * 1968-12-31 1970-07-20
US4565631A (en) * 1982-12-17 1986-01-21 Taprogge Gesellschaft Mbh Backflow-type self-cleaning filter
EP0216729A1 (fr) * 1985-08-16 1987-04-01 Alusuisse-Lonza Services Ag Bougie filtrante de purification de gaz d'échappement de moteurs diesel
DE3842436A1 (de) * 1988-12-16 1990-06-21 Weinhold Karl Rohrleitungsfilter

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