WO2000062936A1 - Systeme et procede pour la purification de gaz en ecoulement - Google Patents

Systeme et procede pour la purification de gaz en ecoulement Download PDF

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Publication number
WO2000062936A1
WO2000062936A1 PCT/FI1999/000315 FI9900315W WO0062936A1 WO 2000062936 A1 WO2000062936 A1 WO 2000062936A1 FI 9900315 W FI9900315 W FI 9900315W WO 0062936 A1 WO0062936 A1 WO 0062936A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
flow duct
gas
electrode
duct
Prior art date
Application number
PCT/FI1999/000315
Other languages
English (en)
Inventor
Tapani Karhinen
Matti MALKAMÄKI
Original Assignee
Fortum Service Oy
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 Fortum Service Oy filed Critical Fortum Service Oy
Priority to PCT/FI1999/000315 priority Critical patent/WO2000062936A1/fr
Priority to AU34240/99A priority patent/AU3424099A/en
Publication of WO2000062936A1 publication Critical patent/WO2000062936A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
    • F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
    • F02C7/052—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/36—Controlling flow of gases or vapour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/10—Ionising electrode with two or more serrated ends or sides

Definitions

  • the present invention relates to an arrangement according to the preamble of Claim 1 and a method according to the preamble of Claim 14 for purifying a gas.
  • a gas turbine comprises three main sections: a compressor, a combustion chamber and a turbine.
  • the air required for combustion is initially led to the compressor section of the gas turbine, in which the pressure of the air is increased.
  • the combustion air is led to the combustion chamber, where it is mixed with fuel, after which the fuel-air mixture is burned.
  • the hot combustion gases are led through the turbine section and out of the gas turbine.
  • the quantity of combustion air led to a gas turbine is considerably greater than the theoretical quantity of air required for the combustion of the fuel, so that even a small pressure drop will significantly reduce the effective power of the gas turbine.
  • water may condense on the surface of the barrier filter and detach the dirt accumulated on the filter. In that case, devices, such as the gas turbine's compressor section, located downstream from the filter will be dirtied. Condensation of moisture is probable, if the temperature of the air being filtered is above 7°C. If the temperature of the air being filtered is about -1 °C ...
  • the moisture in the air may freeze on the surface of the filter and on surfaces downstream from the filter, due to the reduction in the static air pressure caused by the barrier filter.
  • air heated in the gas turbine's compressor section can be recirculated in front of the filter, though this will reduce the efficiency of the compressor section.
  • the power of the gas turbine will drop as the temperature of the air led to the compressor rises.
  • ion-blast technique in which, in one embodiment the flow of gas to be purified is led to a duct with a annular cross- section.
  • the flow develops strong vortices as it moves down the duct, while the gas is simultaneously ionized with the aid of electrodes located in the duct.
  • the mechanical and electrical forces acting on the particles in the mass of the flow of gas being purified and the centrifugal forces within the flow cause the particles to move to the surface of the duct wall.
  • One weakness in the above technique is the large pressure drop caused by the vortices in the gas being purified.
  • the present invention is intended to eliminate the defects in the above cleaning techniques and to create a new kind of arrangement and method for applying the ion- blast technique to purify a flow of gas.
  • the invention is based on leading the flow of gas to be purified to one or several flow ducts, inside each of which there is an electrode running parallel to the flow duct, with ion-producing tips attached to the electrode.
  • the electrode is a closed piece with a volume, in which case the gas to be purified does not flow through it and the flow of gas in the duct has a ring-shaped cross-sectional surface.
  • a voltage is connected to the electrode, so that electrically-charged ion beams are induced in the ends of the ion-producing tips.
  • the walls of the flow duct are earthed, so that the difference in potential between the electrode and the walls directs the ion beams towards the wall.
  • the ion beams meet the gas to be purified flowing through the flow duct, when substances in the mass of the gas other than those in a gas phase, such as particles and drops of water, are moved by the mechanical and electrical forces produced by the ion beam onto the surface of the inner wall of the flow duct.
  • the cleaning effect of an apparatus according to the invention is mainly due to the mechanical force directed on the gas to be purified, and not so much to electrostatic filtering, as, for example, in an electrostatic precipitator.
  • the invention provides essential benefits.
  • the aim is to create a flow, in the flow duct of an apparatus according to the invention, of the gas to be purified that is as steady and undisturbed as possible, so that the pressure drop in the flow will be substantially less than in other purifying apparatuses with a corresponding efficiency.
  • the pressure drop in the flow caused by an apparatus according to the invention may be only one-tenth of the pressure drop caused by a barrier filter, which increases the efficiency of the gas turbine and reduces freezing of moisture in the air caused by the static pressure drop.
  • a apparatus according to the invention will not only remove particles, but also drops of water from the gas being filtered, which also reduces freezing of the gas being purified.
  • the invention can be used to reduce the recirculation of warm air, thus reducing the temperature of the air led to the compressor section and increasing the efficiency of the gas turbine.
  • the pressure drop in an apparatus according to the invention remains practically constant and does not vary with dirtiness as in a barrier filter.
  • the drops of water removed from the gas flow flush away the particles collected on the walls of the flow duct, which considerably reduces the need to clean the surfaces and eliminates the additional shutdowns needed for the replacement of barrier filters.
  • An apparatus according to the invention is simple to construct and economical to implement, and can be used in many other applications besides cleaning the air led to the compressor section of a gas turbine.
  • Figure 1 shows one arrangement according to the invention.
  • Figure 2 shows one example of a cross-section of the flow ducts in the arrangement according to the invention.
  • Figure 3 shows another example of a cross-section of the flow ducts in the arrangement according to the invention.
  • Figure 4 shows third example of a cross-section of the flow ducts in the arrangement according to the invention.
  • Figure 5 shows the flow damping plate located in the lower part of the flow duct.
  • each flow duct 1 has an electrode 2, with ion-producing tips 3 attached, set longitudinally in it.
  • the ion-producing tips 3 can be made of e.g. metal wire.
  • An electrical current is connected to electrode 2, whereupon electrically-charged ion beams are produced at the ends of ion-producing tips 3.
  • the shape of the ion beams is dependent on, among other things, the shape of the ends of the ion-producing tips 3.
  • the voltage of the electrical current connected to electrode 2 is typically 100 - 250 kN.
  • the wall of the flow duct 1 is earthed, so that the difference in potential between the ion-producing tips 3 and the wall directs the ion beams towards the wall.
  • the gas being cleaned flows upwards in flow ducts 1, so that the gas meets the ion beam produced by the ion-producing tips 3, the mechamcal and electrical forces of which cause substances other than those in a gas phase, such as solid particles and drops of water, to separate from the flow and to move to the walls of the flow ducts 1.
  • the drops of water separated from the flow of gas flush the particles collected on the walls into, for example, a drain set under the flow ducts 1.
  • the purified gas is led out of the upper ends of the flow ducts 1.
  • the diameter of flow ducts 1 is large relative to the amount of gas used, the flow of gas in flow ducts 1 being made as steady and undisturbed as possible.
  • the velocity of the flow arising in duct 1 is greatest in the centre of flow duct 1 and least close to the inner walls. Therefore, air must be prevented from flowing through the interior of electrode 2 in the centre of duct 1, as otherwise a considerable part of the gas to be purified would flow through electrode 2.
  • the shape of electrode 2 is such that ion beams cannot be formed in its centre, and a cleaning effect cannot be created.
  • the cross-sectional surface of the flow of gas being purified in flow duct 1 thus has a ring-shaped shape, so that the gas flows close to the inner walls of flow duct 1, but not in the centre of duct 1 at electrode 2.
  • Electrode 2 may be, for example, a tube closed at least at one end in relation to the volume of flow duct 1 or a solid bar, through which the gas cannot flow.
  • the shape of flow duct 1 affects the location of electrode 2 inside flow duct 1.
  • Figures 2, 3, and 4 show the preferred cross-sectional shapes of flow ducts 1.
  • the flow of the gas being purified is made as steady as possible and is distributed uniformly between the various flow ducts 1.
  • Flow damping plates 4, which can be moved vertically, are located in the lower parts of the flow ducts 1, allowing control of the flow rates between the different flow ducts 1.
  • Figure 5 shows an example of the construction of a flow damping plate 4.
  • the earthed flow ducts 5 have a annular cross-section, making it preferable to locate electrode 2 and the attached ion-producing tips 3 in the centre of flow duct 5. This distributes ion beams produced by ion-producing tips 3 as evenly as possible over the entire cross-section of flow duct 1.
  • the gas to be cleaned is prevented from rising between flow ducts 1 by, for example, plates set between flow ducts 1.
  • the earthed flow ducts 6 are shaped as regular hexagons, so that the ion beams from ion-producing tips 3 of electrode 2 in the centre of flow duct 6 are also distributed evenly across the cross-section of flow duct 6. If flow duct 6 has a cross- section in the form of a regular hexagon, the ion beams will be distributed considerably more evenly than they would be, for instance, in a square-shaped duct.
  • a apparatus according to the invention can also be assembled according to the example in Figure 4, by means of concentrically arranged, annular flow ducts 7, 8, 9, ducts 7, 9 being earthed.
  • Electrode 2 is located inside flow duct 7 and has ion- producing tips 3 attached to it.
  • Flow duct 7 is surrounded by flow duct 8, which has ion-producing tips 3 attached to its external and internal surfaces.
  • An electrical current is connected to the wall of flow duct 8, causing it to act as an electrode.
  • the ion beams of ion-producing tips 3 attached to flow duct 8 are aimed at the surfaces of the earthed flow ducts 7, 9. Additional flow ducts to those shown in Figure 4 can be similarly set inside one another.
  • a flow damping plate 4 is located in the lower section of flow duct 1.
  • the quantity of gas flowing through flow duct 1 can be controlled by moving flow damping plate 4 in relation to plate-stop 10 attached to flow duct 1.
  • a solution according to the invention can also be used in other applications, in which other substances than those in a gas phase, such as particles and drops of water, are separated from the flow of gas.
  • the invention is particularly useful in cleaning air led to the compressor section of a gas turbine.
  • the number of the flow ducts 1, 5, 6, 7, 8, 9, and their diameter and length can be varied in individual applications, for example, according to the flow conditions.
  • the gas turbine has a fuel power of about 120 MW and the flow of combustion air is about 130 m 3 /s
  • Each flow duct contains an electrode, with an external diameter of 0.5 m.
  • the ion-producing tips attached to the electrode are about 5 cm long.
  • the electrode's external diameter is typically at least 38 cm, the ratio of the internal diameter of flow duct 1, 5, 6, 7 to the external diameter of electrode 2 being typically 2 - 5.
  • Flow duct 1, 5, 6, 7, 8, 9 can have a cross-section of any shape, besides the aforementioned circle and regular hexagon.
  • electrode 2 can also vary in cross-sectional shape, it is essential that the flow of gas being purified in flow duct 1, 5, 6, 7 has an ring-shaped cross- sectional surface.
  • the ring-shaped means that the gas being cleaned cannot flow through electrode 2, the flow being divided instead in the ring-shaped area between the external surface of electrode 2 and the inner wall of flow duct 1 , 5, 6, 7.
  • the outer circumference of the ring-shaped cross-sectional surface of the flow is thus limited by an optional closed curve and the inner circumference by another optional closed curve.
  • the ring-shaped nature of the cross-sectional surface of the flow of the gas being purified is not, as such, affected by the cross-sectional shape of flow duct 1, 5, 6, 7, or electrode 2.
  • Flow ducts 1, 5, 6, 7, 8, 9 need not necessarily be vertical while flow ducts 1, 5, 6, 7, 8, 9 and electrode 2 can also be curved, for example, to save space.
  • the flow of gas to be cleaned can enter flow duct 1, 5, 6, 7, 8, 9 from either end. To reduce pressure drops, it is preferable for the flow of gas to be cleaned to enter one end of flow duct
  • a flow damping plate 4 and plate-stop 10 can be located at either end, or both ends, of flow duct 1, 5, 6, 7, 8, 9.
  • the number of ion-producing tips 3 attached to electrode 2 must be selected to suit the application, as it is affected by such factors as the dimensions of flow duct 1, 5, 6, 7, 8, 9, the voltage of electrode
  • Ion-producing tips 3 are preferably attached to electrode 2 in such a way that the ion beams of the ion-producing tips 3 do not overlap, as this will reduce the swirling of the gas being cleaned and pressure drops.
  • more than one electrode 2 can be placed in flow duct 1, 5, 6, 7.
  • a voltage different to that of electrode 2 can be connected to them.
  • a different voltage to the 100 - 250 kN referred to can be used in electrode 2, if required, for example, by the dimensions of flow duct 1, 5, 6, 7, 8, 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Electrostatic Separation (AREA)

Abstract

L'invention concerne un système et un procédé pour la purification de gaz en écoulement. Il existe au moins une conduite (1, 5, 6, 7) présentant un premier potentiel, qui possède une dimension interne et par laquelle le gaz s'écoule, et au moins une électrode (2) présentant un second potentiel, en position parallèle à celle de la conduite (1, 5, 6, 7), électrode à laquelle sont fixées des extrémités productrices d'ions (3), lesquelles utilisent la tension qui les parcourt pour ioniser le gaz s'écoulant dans la conduite (1, 5, 6, 7). L'électrode (2) est un élément fermé par rapport à la conduite (1, 5, 6, 7), présentant un volume dans lequel le gaz ne peut pas s'écouler, si bien que le gaz s'écoulant dans la conduite (1, 5, 6, 7) obéit à un flux dont la surface offre un profil transversal annulaire.
PCT/FI1999/000315 1999-04-19 1999-04-19 Systeme et procede pour la purification de gaz en ecoulement WO2000062936A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI1999/000315 WO2000062936A1 (fr) 1999-04-19 1999-04-19 Systeme et procede pour la purification de gaz en ecoulement
AU34240/99A AU3424099A (en) 1999-04-19 1999-04-19 Arrangement and method for purification of flowing gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1999/000315 WO2000062936A1 (fr) 1999-04-19 1999-04-19 Systeme et procede pour la purification de gaz en ecoulement

Publications (1)

Publication Number Publication Date
WO2000062936A1 true WO2000062936A1 (fr) 2000-10-26

Family

ID=8556748

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000315 WO2000062936A1 (fr) 1999-04-19 1999-04-19 Systeme et procede pour la purification de gaz en ecoulement

Country Status (2)

Country Link
AU (1) AU3424099A (fr)
WO (1) WO2000062936A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003002861A1 (fr) * 2001-06-05 2003-01-09 Fortum Oyj Procede pour nettoyer l'air d'alimentation d'une turbine a gaz
WO2006001705A1 (fr) * 2004-06-23 2006-01-05 Roger Gale Filtre electrostatique de ventilateur de tunnel
EP1769851A1 (fr) * 2005-09-27 2007-04-04 Balcke-Dürr GmbH Filtre électrostatique
CH699458A1 (de) * 2008-09-10 2010-03-15 Ompeg Gmbh Vorrichtung zur Ionisierung von Gasen und Partikeln.
EP1958696A3 (fr) * 2007-02-16 2013-04-24 Otto Spanner GmbH Electrofiltre
EP3383545A4 (fr) * 2015-12-02 2018-12-26 Lundberg LLC Système, appareils, et procédés pour améliorer le fonctionnement d'une turbine à l'aide d'une précipitation électrostatique
EP3470144A1 (fr) * 2017-10-12 2019-04-17 Aavi Technologies Ltd Canal de collecteur présentant un dispositif de réglage de débit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007298B (de) * 1951-01-29 1957-05-02 Apra Precipitator Corp Elektrische Gasentstaubungsanlage, insbesondere fuer die Reinigung von Rauchgasen
GB968065A (en) * 1962-04-21 1964-08-26 Metallgesellschaft Ag Improvements in or relating to the removal of mists and solids from gases by electrostatic precipitation
DE2006298A1 (fr) * 1969-02-13 1970-09-03
DE3930872A1 (de) * 1989-09-15 1991-03-28 Rolf Hertfelder Elektrostatische filtereinrichtung
EP0715894A1 (fr) * 1994-12-10 1996-06-12 Rolf Hertfelder Installation de filtrage électrostatique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1007298B (de) * 1951-01-29 1957-05-02 Apra Precipitator Corp Elektrische Gasentstaubungsanlage, insbesondere fuer die Reinigung von Rauchgasen
GB968065A (en) * 1962-04-21 1964-08-26 Metallgesellschaft Ag Improvements in or relating to the removal of mists and solids from gases by electrostatic precipitation
DE2006298A1 (fr) * 1969-02-13 1970-09-03
DE3930872A1 (de) * 1989-09-15 1991-03-28 Rolf Hertfelder Elektrostatische filtereinrichtung
EP0715894A1 (fr) * 1994-12-10 1996-06-12 Rolf Hertfelder Installation de filtrage électrostatique

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003002861A1 (fr) * 2001-06-05 2003-01-09 Fortum Oyj Procede pour nettoyer l'air d'alimentation d'une turbine a gaz
WO2006001705A1 (fr) * 2004-06-23 2006-01-05 Roger Gale Filtre electrostatique de ventilateur de tunnel
US7767005B2 (en) 2004-06-23 2010-08-03 Roger A Gale Tunnel fan electrostatic filter
AU2005257672B2 (en) * 2004-06-23 2010-10-21 Roger Gale Tunnel fan electrostatic filter
CN101005901B (zh) * 2004-06-23 2011-04-06 罗杰·格尔 隧道风扇静电过滤器
EP1769851A1 (fr) * 2005-09-27 2007-04-04 Balcke-Dürr GmbH Filtre électrostatique
EP1958696A3 (fr) * 2007-02-16 2013-04-24 Otto Spanner GmbH Electrofiltre
CH699458A1 (de) * 2008-09-10 2010-03-15 Ompeg Gmbh Vorrichtung zur Ionisierung von Gasen und Partikeln.
EP3383545A4 (fr) * 2015-12-02 2018-12-26 Lundberg LLC Système, appareils, et procédés pour améliorer le fonctionnement d'une turbine à l'aide d'une précipitation électrostatique
AU2016362314B2 (en) * 2015-12-02 2020-04-02 Airtech Innovations, Llc System, apparatuses, and methods for improving the operation of a turbine by using electrostatic precipitation
EP3470144A1 (fr) * 2017-10-12 2019-04-17 Aavi Technologies Ltd Canal de collecteur présentant un dispositif de réglage de débit

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