EP0420902A1 - Procede et appareil de traitement de fluides - Google Patents

Procede et appareil de traitement de fluides

Info

Publication number
EP0420902A1
EP0420902A1 EP19890907209 EP89907209A EP0420902A1 EP 0420902 A1 EP0420902 A1 EP 0420902A1 EP 19890907209 EP19890907209 EP 19890907209 EP 89907209 A EP89907209 A EP 89907209A EP 0420902 A1 EP0420902 A1 EP 0420902A1
Authority
EP
European Patent Office
Prior art keywords
fluid
pump
probe
rotating
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.)
Withdrawn
Application number
EP19890907209
Other languages
German (de)
English (en)
Inventor
Michael Cole
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.)
Genevac Ltd
Original Assignee
Genevac Ltd
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 Genevac Ltd filed Critical Genevac Ltd
Publication of EP0420902A1 publication Critical patent/EP0420902A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/18—Centrifugal pumps characterised by use of centrifugal force of liquids entrained in pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/12—Pumps with scoops or like paring members protruding in the fluid circulating in a bowl

Definitions

  • This invention relates to a method and apparatus for processing a fluid (liquid or gas), particularly using a pump of a type in which an aperture in a probe is exposed to a body of rotating fluid within the apparatus.
  • a method of pumping comprising the steps of:
  • the pumping action therefore uses the increase in the pressure of the fluid in the pump to expel fluid therefrom.
  • the pumped fluid may be the same as the fluid rotating within the pump.
  • the fluid rotating within the pump it is preferred for the fluid rotating within the pump to have a higher density than the pumped fluid.
  • the body of fluid rotating within the pump may be of a heavy inert gas such as Xenon or Sulphur hexafluoride.
  • the pumped fluid may be water using a body of rotating liquid within the pump, which may itself be water or more preferably a liquid of heavier density than water.
  • the body of rotating fluid need not fill the internal space defined between the relatively rotating inner and outer parts.
  • suction it is not always necessary for suction to be created at the probe; for example in the separation of fluids it may be preferred to feed the mixed fluids to the aperture under pressure.
  • pumping apparatus comprising:
  • a Pitot tube having an aperture exposed to the body of rotating fluid and through which fluid is expelled from the pump.
  • its inlet end is preferably exposed to "the body of rotating fluid near the outer periphery thereof, where the rotating fluid is travelling at its highest speeds.
  • the suction effect into the probe can be increased by the provision of one or more protrusions on one of the relatively rotating parts which cause the rotating fluid to be locally squeezed as it passes the probe aperture. This locally increases the fluid velocity and thereby enhances suction.
  • the effect is increased when one or other of the probe and the protrusion or protrusions, but not both, is or are rotating with the body of fluid.
  • the less dense fluid may be expelled through a centre outlet, and the mo ⁇ .e dense fluid expelled via a Pitot tube having its inlet disposed in the radially outer regions.
  • This method is especially effective where a liquid/gas mixture is sucked in through the one or more apertured probes, but is also generally applicable to fluid mixtures containing fluids of differing densities.
  • the pump Since the pump is capable of pumping mixtures ranging from 100% gas to 100% liquid, it may be applied to che pumping and separating of oil/gas mixtures such as occur in oilfields. In such case the pump would discharge virtually pure oil out from the Pitot tube, positioned near the outside of the rotating fluid mixture, and virtually pure gas through the centre of the pump.
  • a preferred probe is in the form of a wing extending parallel to the axis of the pumping apparatus and apertured parallel to said axis.
  • this wing may be supported either by a strut attached to the fixed hub or to a fixed supporting disc mounted within the rotating pump housing. It is important for the wing not to reduce the ram effect of the rotating fluid on the Pitot tube and, if the Pitot tube is located adjacent the wing close to the periphery of the rotating body of liquid, the wing may be cut away in line with the Pitot tube inlet.
  • the Pitot tube inlet is positioned radially within the wing (i.e. at a smaller radius from the pump axis than the wing) .
  • the apparatus is self-priming.
  • Gas scrubbing has hitherto typically involved the passage of a contaminated gas through a body of neutralising liquid (ie a bath or curtain or spray of the neutralising liquid) . This has required a fan or compressor to effect the passage through the liquid and intimate mixing has been difficult to achieve.
  • neutralising liquid ie a bath or curtain or spray of the neutralising liquid
  • the present invention allows very intimate mixing of a gas and a neutralising liquid if the latter is employed as the working fluid in a pump of the type described in the aforementioned UK Patent No.2159579.
  • the pumping action therefore uses the increase in the pressure of the fluid in the pump to expel gas therefrom.
  • the active fluid is chosen to dissolve or otherwise remove unwanted impurities in the incoming gas.
  • the active fluid may be a gas or a liquid or a vapour.
  • the passage of the above mentioned protrusions over the probe(s) is believed to generate shock waves which cause relatively large bubbles of gas to be broken up to a very small size so as to give a large area of contact between the fluid and the gas, thereby improving the gas scrubbing.
  • Clean fresh active fluid may be added via the suction probe (normally used to input the gas) or via a central port in a static part of the pump, and spent active fluid may be recovered using a radially inwardly positioned Pitot scoop.
  • two such pumps may be multiplexed and the spent active fluid from the one may be replaced with fresh active fluid whilst the other is operational and vice versa.
  • the pump in accordance with the invention may analogously be used to purify a liquid by liquid scrubbing, in which a gas is passed through the liquid to remove or replace unwanted contaminants in the liquid.
  • a gas for example, clean air may be used to remove volatile solvents in solution in oil; or as a further example, nitrogen may be passed through water (eg sea water) containing dissolved oxygen, in order to strip out and replace the oxygen and thus help to prevent oxidisation eg in pipes.
  • FIG. 1 shows one embodiment of apparatus in accordance with the invention
  • Figure 2 shows a second embodiment
  • Figure 3 shows a modification thereto.
  • the pump shown in Figure 1 has a cylindrical housing 10, and a tubular probe 12 extending through the housing wall. Filling the housing is a body of fluid 14.
  • an impeller 16 which has a central core 18 and a number of radial blades 20.
  • An external motor (not shown) drives the impeller 16 in rotation and the rotating blades 20 act on the fluid 14 to set this in motion.
  • the rotating impeller causes the fluid to move in a circular path.
  • a Pitot tube 26 mounted in the housing is a Pitot tube 26, having its inlet near the periphery of the rotating fluid.
  • the Pitot tube 26 will be used to remove the separated liquid, while the gas is removed from an outlet (not shown) towards the centre of the pump.
  • the liquid can either be removed at low pressure and at a high flow rate from the said central outlet, or at a high pressure and at a low- flow rate from the Pitot tube 26.
  • a flow control valve such as a one-way valve is to be incorporated in the inlet or outlet or both it may be located at equivalent positions such as are shown at 53 and 55 in Figure 2.
  • the outlet of the Pitot tube 26 will be connected to the inlet of the next stage of the pump.
  • the probe 12 shown is in the form of a cylidrieal tube and this tube will be connected to the space to be evacuated. Near the bottom of the tube is an opening 28 in the tube side wall. The end of the tube is closed. As shown, this opening 28 is open in the direction generally perpendicular to the flow of fluid indicated by the arrows 30. As the body of fluid 14 rotates, fluid is drawn through the tubular probe 12, through the opening 28 into the interior of the pump. At the same time, fluid is rammed into the inlet of the Pitot tube 26, thence to be expelled to atmosphere.
  • More than one tubular probe 12 and more than one Pitot tube 26 may be located around the cylindrical housing to provide separate independent pumping devices or if connected in parallel to increase the pumping speed or throughput.
  • the pump When pumping fluids (gases or liquids) which are less dense than the fluid medium within the pump, it is not essential for the pump to be filled, and it may operate with a rotating ring of fluid medium. Clearly the pump may alternatively act in the pressurisation mode.
  • the pump shown in Figure 2 has a housing 40 which is set in rotation in the direction of arrows 42 by an external motor (not shown) .
  • the housing rotates about a central hub 44.
  • a ring of fluid medium is shown at 46 in the position the latter will occupy when in use.
  • Radial protrusions 48 are provided around the inner surface of the housing 40. These protrusions help to set the fluid medium 46 in motion when the housing rotates, but also serve to enhance the suction effect in the probe as above described.
  • the protrusions 48 may extend parallel to the axis of the housing or may be skewed relative thereto. Additionally or alternatively the probe may likewise be skewed.
  • a stem 50 extends radially from the hub 44 and carries a probe 52 which is located within the flowing fluid medium 46.
  • the probe is wing shaped and is aligned with the liquid flow direction and extends nearly the full length of the cylinder.
  • Suction passage 54 opens in the radially outer surface of the probe and may be a circular hole 56 (or holes) or more preferably a slot, parallel to the pump axis.
  • An exhaust passage 58 opens into the cylindrical space 60 at the centre of the pump, and both passages 54 and 58 pass out of the pump through the central hub 44.
  • a Pitot tube 26 communicates with a separate outlet 27 through the central hub 44.
  • the Pitot tube 26 is located adjacent the wing probe 52, the latter if necessary having a cut-out to allow the rotating fluid medium to impact freely on the Pitot tube inlet. Also if necessary, cut-outs may be provided in the protrusions 48.
  • the chamber into which the gas is to be pumped is connected to the exhaust passage 58 and the inlet 54 to the liquid/gas mixture source.
  • a chamber into which liquid is to be expelled is connected to the outlet 27 from the Pitot tube 26.
  • References 53 and 55 denote possible positions for flow control valves, such as one way valves, if either or both is required, in the Figure 2 embodiment .
  • the fluid medium 14 or 46 may, in use of the pump for evacuation or for compression purposes, be oil or possibly water or, if hydrocarbon absence is essential, a low melting point liquid metal or alloy.
  • more than one probe and stem assembly such as 50, 52 and likewise more than onf Pitot tube 26, may be mounted to extend radially from the hub 44, so as to be circularly spaced around the housing.
  • Figure 3 shows a modification of the probe 52 of Figure 2.
  • the probe 70 carried by the stem 50 has a basic wing shape based on an axis which is curved.
  • the basic wing shape 74 is, however, cut away to form a linear ramp 76 on the leading side of the wing.
  • the aperture 78 corresponding to the aperture 56 of Figure 2, lies at the top of this linear ramp 76.
  • the ramp may alternatively be convexly or concavely curved.
  • Filters and/or valve means may be employed in the inlet and outlet as required, as exemplified by the previously referred to control valves 53 and 55.
  • FIG. 3 also shows the Pitot tube 26 relocated in a position below the probe 70. This modification has the advantage that the pump is self-priming.
  • the precise positioning of the Pitot tube (or tubes, where more than one is employed) and the stem and the probe (or probes) need not be as shown, but may involve the positioning of the Pitot tube(s) at circumferentially spaced positions relative to the stem(s) .
  • the invention also envisages the provision of means for adjusting the position of the Pitot tube(s) relative ho the stem(s) and probe(s) to enable positions of maximum efficiency to be found.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La pompe à fluide décrite comprend un logement cylindrique externe (14) tournant par rapport à un moyeu central (44) d'où s'étend une sonde radiale (52), laquelle est ajourée dans sa surface externe pour être exposée à l'écoulement d'une couronne rotative de fluide opérationnel (14). La sonde comporte un passage interne (54) destiné à placer l'ouverture (56) en communication avec l'extérieur, de sorte que le fluide est aspiré dans la pompe grâce à la force d'aspiration créée au niveau de la sonde. Un tube de Pitot (26) est également exposé au fluide en rotation et est pourvu d'une ouverture à partir de laquelle le fluide est expulsé de la pompe. Le fluide aspiré dans la sonde (52) peut être constitué par un gaz devant être nettoyé par friction et le fluide opérationnel en rotation peut être constitué par un liquide actif destiné à dissoudre les impuretés contenues dans le gaz.
EP19890907209 1988-06-10 1989-06-07 Procede et appareil de traitement de fluides Withdrawn EP0420902A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888813745A GB8813745D0 (en) 1988-06-10 1988-06-10 Improved method of pumping & pumping apparatus
GB8813745 1988-06-10

Publications (1)

Publication Number Publication Date
EP0420902A1 true EP0420902A1 (fr) 1991-04-10

Family

ID=10638408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890907209 Withdrawn EP0420902A1 (fr) 1988-06-10 1989-06-07 Procede et appareil de traitement de fluides

Country Status (3)

Country Link
EP (1) EP0420902A1 (fr)
GB (1) GB8813745D0 (fr)
WO (1) WO1989012170A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2356895A (en) * 1999-06-04 2001-06-06 Russell White Vacuum pump
US7597784B2 (en) * 2002-11-13 2009-10-06 Deka Products Limited Partnership Pressurized vapor cycle liquid distillation
US7488158B2 (en) 2002-11-13 2009-02-10 Deka Products Limited Partnership Fluid transfer using devices with rotatable housings
US11826681B2 (en) 2006-06-30 2023-11-28 Deka Products Limited Partneship Water vapor distillation apparatus, method and system
US11884555B2 (en) 2007-06-07 2024-01-30 Deka Products Limited Partnership Water vapor distillation apparatus, method and system
MX2011001778A (es) 2008-08-15 2011-05-10 Deka Products Lp Aparato expendedor de agua.
DE102009021922B3 (de) * 2009-05-19 2010-09-09 Ksb Aktiengesellschaft Staurohrpumpe
WO2014018896A1 (fr) 2012-07-27 2014-01-30 Deka Products Limited Partnership Commande de la conductivité dans une sortie d'eau de production destinée à un évaporateur
US10151314B2 (en) 2013-03-15 2018-12-11 Envirotech Pumpsystems, Inc. Gear-driven flow-through pitot tube pump

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1193759A (fr) * 1959-11-04
US3936214A (en) * 1975-01-22 1976-02-03 Sun Oil Company Pumping two-phase fluids
SU840485A1 (ru) * 1979-09-27 1981-06-23 Предприятие П/Я М-5356 Самовсасывающий черпаковый насос
DE3138315A1 (de) * 1980-10-08 1982-06-16 Siemens AG, 1000 Berlin und 8000 München Staudruckfoerdereinrichtung fuer fluessigkeiten, gase oder deren gemische

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8912170A1 *

Also Published As

Publication number Publication date
GB8813745D0 (en) 1988-07-13
WO1989012170A1 (fr) 1989-12-14

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