FR2937264A1 - Electrostatic and centrifugal effect dust separator for e.g. flue gas, has high voltage electrode placed in entire length of downstream tube connected to ground, where internal wall of tube defines anode of electrostatic effect zone - Google Patents

Electrostatic and centrifugal effect dust separator for e.g. flue gas, has high voltage electrode placed in entire length of downstream tube connected to ground, where internal wall of tube defines anode of electrostatic effect zone Download PDF

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Publication number
FR2937264A1
FR2937264A1 FR0805863A FR0805863A FR2937264A1 FR 2937264 A1 FR2937264 A1 FR 2937264A1 FR 0805863 A FR0805863 A FR 0805863A FR 0805863 A FR0805863 A FR 0805863A FR 2937264 A1 FR2937264 A1 FR 2937264A1
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electrostatic
tube
centrifugal
downstream
dust collector
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FR2937264B1 (en
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Leclerc Monique Huret
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Huret-Leclerc Technologies Fr
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    • 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
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/15—Centrifugal forces
    • 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
    • B03C3/06—Plant or installations having external electricity supply dry type characterised by presence of stationary tube 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
    • B03C3/36—Controlling flow of gases or vapour
    • B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
    • B03C3/363—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located before the filter
    • 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
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/74—Cleaning the electrodes
    • B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
    • B03C3/765—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact with electromagnetic rappers
    • 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
    • B03C3/74—Cleaning the electrodes
    • B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
    • B03C3/766—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact with pneumatic rappers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electrostatic Separation (AREA)

Abstract

The separator has a rotating unit for rotating gas flow to be purified during admission of the gas flow in an upstream tube (1), and a centrifugal effect zone (11) that is enclosed in the upstream tube. A high voltage electrode (7) is placed in an axle and in entire length of a downstream tube (2) that is connected to ground. An internal wall of the downstream tube defines an anode of an electrostatic effect zone (12). A flexible joint (14) mechanically separates the downstream tube from the separator.

Description

-2 -2

Une première zone, en amont par rapport au flux gazeux, utilise un effet centrifuge dans un premier tube sur la paroi interne duquel les particules sont plaquées avant de tomber par gravité dans une trémie collectrice, puis une seconde zone en aval, met en jeu un effet électrostatique tout le long d'un second tube dont la paroi interne se comporte comme l'anode d'un électrofiltre cylindrique. Cette conception permet, en jouant sur les diamètres et longueurs des tubes de respecter les impératifs des deux principes avec une grande vitesse des gaz au niveau centrifugation et une faible vitesse conjuguée à un long temps de séjour au niveau électrostatique. Par ailleurs, l'un des problèmes posés pour l'exploitation en continu des électrofiltres est celui du nettoyage périodique des électrodes collectrices pour en chasser la poussière en évitant que celle-ci soit reprise dans le flux gazeux. La présente invention résout ce problème en permettant au tube anode et à l'électrode de vibrer avec une forte amplitude sans transmettre les vibrations aux autres parties grâce à l'utilisation d'un joint souple reliant le tube anode au corps de l'appareil, en inversant éventuellement sa polarité au moment du nettoyage et en isolant par un volet l'élément en cours de nettoyage. A first zone, upstream with respect to the gas flow, uses a centrifugal effect in a first tube on the inner wall of which the particles are plated before falling by gravity into a collecting hopper, then a second zone downstream, involves a electrostatic effect all along a second tube whose inner wall behaves like the anode of a cylindrical electrofilter. This design makes it possible, by varying the diameters and lengths of the tubes, to respect the requirements of the two principles with a high speed of the gases at the centrifugation level and a low speed combined with a long residence time at the electrostatic level. Moreover, one of the problems posed for the continuous operation of the electrostatic precipitators is that of periodic cleaning of the collecting electrodes in order to drive away the dust by preventing it from being taken up in the gas flow. The present invention solves this problem by allowing the anode tube and the electrode to vibrate with a high amplitude without transmitting the vibrations to the other parts through the use of a flexible seal connecting the anode tube to the body of the apparatus, by possibly reversing its polarity at the time of cleaning and isolating by a shutter the element being cleaned.

L'invention sera bien comprise à la lecture du descriptif qui suit et des dessins des planches annexées illustrant à titre d'exemples non limitatifs deux formes possibles d'exécution de l'invention. Sur le dessin de la planche 1/2, un dépoussiéreur selon l'invention est composé d'un tube amont (1) et d'un tube aval coaxial (2), d'un conduit (3) par où le gaz à traiter est admis tangentiellement à grande vitesse dans l'espace annulaire (4) constitué entre les deux tubes, d'un conduit (5) en sortie du tube aval (2), relié au circuit d'évacuation du gaz et d'une trémie inférieure (6) qui recueille les particules extraites du gaz. Durant leur parcours hélicoïdal dans l'espace (4) entre les deux tubes concentriques (1) et (2), les particules les plus lourdes sont plaquées par la force centrifuge sur la paroi interne du tube amont (1), échappent au flux gazeux lorsque celui-ci s'inverse pour pénétrer dans le tube aval (2) et tombent dans la trémie inférieure (6). Une électrode (7) alimentée en courant continu à haute tension par un câble (8) via un isolateur (9) est disposée axialement au centre et tout le long du tube aval (2). Cette électrode constitue la cathode du système et produit un effet "couronne" qui ionise les particules les plus fines, peu sensibles à l'effet centrifuge, donc toujours présentes dans le flux gazeux. Le tube aval (2) étant relié à la terre par un conducteur (10) il fait fonction d'anode ce qui attire vers lui les particules ionisées qui viennent se déposer sur sa face interne. The invention will be better understood on reading the following description and drawings of the attached plates illustrating by way of non-limiting examples two possible embodiments of the invention. In the drawing of the plate 1/2, a dust collector according to the invention is composed of an upstream pipe (1) and a coaxial downstream pipe (2), a pipe (3) through which the gas to be treated is admitted tangentially at high speed in the annular space (4) formed between the two tubes, a duct (5) at the outlet of the downstream tube (2), connected to the gas evacuation circuit and a lower hopper (6) which collects the particles extracted from the gas. During their helical path in the space (4) between the two concentric tubes (1) and (2), the heavier particles are pressed by the centrifugal force on the inner wall of the upstream tube (1), escape the gas flow when it is reversed to enter the downstream tube (2) and fall into the lower hopper (6). An electrode (7) supplied with high voltage direct current by a cable (8) via an insulator (9) is arranged axially in the center and all along the downstream tube (2). This electrode constitutes the cathode of the system and produces a "crown" effect which ionizes the finest particles, little sensitive to the centrifugal effect, therefore always present in the gas flow. The downstream tube (2) being connected to the earth by a conductor (10) it acts as anode which attracts towards it the ionized particles which are deposited on its inner face.

Parvenu à l'extrémité du tube aval (2) le gaz est ainsi très bien dépoussiéré et peut sortir de l'appareil par le conduit (5). On remarquera que les dessins schématisent un tube aval (2) de grand diamètre offrant aux gaz une section de passage très importante par rapport à la section annulaire (4) pour illustrer le fait que si la vitesse dans la zone à effet centrifuge (11) est de l'ordre de 10 à 15 m/s, elle s'abaisse à environ 1 à 3 m/s dans la zone de capture électrostatique (12) en regard de l'électrode. La longueur de la zone de capture électrostatique (12) étant par ailleurs calculée pour que le temps de séjour des gaz y soit d'au moins '/2 seconde. Périodiquement il convient de décoller et de récupérer à la base de l'appareil les poussières déposées sur la face interne du tube aval (2). Pour cela des moyens (13) tels que des vibreurs ou des marteaux sont reliés au tube aval (2) et un joint souple (14) sépare mécaniquement le tube aval (2) du reste du dépoussiéreur. Lors des opérations de nettoyage ce joint souple (14) permet de faire vibrer uniquement le tube aval (2) et son électrode (7) avec une amplitude suffisante pour décoller les poussières. Le joint souple (14) étant également électriquement isolant, le tube aval (2) normalement relié à la terre par le conducteur (10) peut être momentanément rendu positif par ce même conducteur (10) tandis que l'alimentation de l'électrode d'ionisation (7) est coupée, dans ce cas l'attractivité du tube aval (2) sur les particules est supprimée. Enfin, pour éviter que des particules précédemment capturées soient reprises par le flux gazeux lors des opérations de nettoyage, il est prévu qu'un volet (15) placé par exemple dans le conduit (5) se ferme lors du processus afin de stopper la circulation du gaz et pour que la mise hors service périodique d'un élément du dépoussiéreur ne perturbe pas le fonctionnement global de l'installation il suffit de prévoir un élément de dépoussiéreur en surnombre par rapport au débit à traiter. Cet élément surnuméraire remplaçant alors celui qui se trouve en cours de nettoyage. Arrived at the end of the downstream tube (2) the gas is thus very well dusted and can exit the device through the conduit (5). It will be noted that the drawings schematize a downstream tube (2) of large diameter giving the gases a very large passage section with respect to the annular section (4) to illustrate that if the speed in the centrifugal zone (11) is of the order of 10 to 15 m / s, it falls to about 1 to 3 m / s in the electrostatic capture zone (12) facing the electrode. The length of the electrostatic capture zone (12) is also calculated so that the residence time of the gases is at least 2 seconds. Periodically it is necessary to take off and recover at the base of the device dust deposited on the inner face of the downstream tube (2). For this, means (13) such as vibrators or hammers are connected to the downstream tube (2) and a flexible seal (14) mechanically separates the downstream tube (2) from the rest of the dust collector. During cleaning operations this flexible seal (14) makes it possible to vibrate only the downstream tube (2) and its electrode (7) with a sufficient amplitude to take off the dust. Since the flexible seal (14) is also electrically insulating, the downstream tube (2) normally connected to earth by the conductor (10) can be momentarily made positive by the same conductor (10) while the power supply of the electrode ionization (7) is cut off, in this case the attractiveness of the downstream tube (2) on the particles is eliminated. Finally, to prevent previously captured particles from being taken up by the gas flow during the cleaning operations, it is provided that a flap (15) placed for example in the duct (5) closes during the process in order to stop the circulation. gas and so that the periodic shutdown of a dust collector element does not disrupt the overall operation of the installation is enough to provide a dust collector element in excess of the flow rate to be treated. This supernumerary element then replacing the one that is being cleaned.

Une autre forme de réalisation de l'invention est représentée sur le dessin de la planche 2/2. Dans ce cas un dépoussiéreur selon l'invention comporte une tuyère d'injection du gaz (16) pouvant être de section correspondante à celle du conduit qu'elle prolonge ou dans lequel elle s'insère. Au débouché de cette tuyère (16) un déflecteur (17) comportant des ailettes inclinées imprime au flux gazeux un mouvement hélicoïdal rapide permettant aux particules les plus lourdes d'être chassées vers l'extérieur par effet centrifuge. Le tube amont (1) entoure et prolonge co-axialement la tuyère (16), ainsi aussitôt après le déflecteur (17) les particules 2937264 -4 Another embodiment of the invention is shown in the drawing of the board 2/2. In this case a dust collector according to the invention comprises a gas injection nozzle (16) which may be of corresponding section to that of the conduit that extends or in which it is inserted. At the outlet of this nozzle (16) a deflector (17) with inclined fins prints the gas flow rapid helical movement allowing the heavier particles to be driven outwardly by centrifugal effect. The upstream tube (1) surrounds and coaxially extends the nozzle (16), and immediately after the deflector (17) the particles 2937264 -4

centrifugées vont se plaquer sur la paroi interne du tube amont (1) et échappent au flux gazeux qui suit globalement l'axe du tube. Sensiblement au dessus du déflecteur (17) le joint souple et isolant (14) assure la liaison et l'étanchéité avec le tube aval (2) dans l'axe duquel est placée l'électrode (7) qui ionise les particules encore présentes dans le flux gazeux. Ces 5 particules sont alors attirées par effet électrostatique par la paroi interne du tube aval (2) relié à la terre. Pour favoriser l'effet électrostatique on sait qu'il convient de diminuer le plus possible la vitesse du flux gazeux, c'est pourquoi le tube aval (2) comporte un renflement au niveau de l'électrode (7), afin d'offrir une plus grande section de passage des gaz dans la zone d'ionisation (12).centrifuged will be pressed on the inner wall of the upstream tube (1) and escape the gaseous flow that follows generally the axis of the tube. Substantially above the deflector (17) the flexible and insulating joint (14) provides the connection and sealing with the downstream tube (2) in the axis of which is placed the electrode (7) which ionizes the particles still present in the gas flow. These particles are then electrostatically attracted by the inner wall of the downstream tube (2) connected to the earth. To promote the electrostatic effect it is known that it is necessary to reduce as much as possible the speed of the gas flow, that is why the downstream tube (2) comprises a bulge at the electrode (7), in order to offer a larger gas passage section in the ionization zone (12).

10 Dans tous les cas un dépoussiéreur à double effet selon l'invention comporte deux zones distinctes et consécutives (11) et (12). En suivant le sens de circulation, immédiatement après son admission dans l'appareil le gaz à épurer acquière une grande vitesse angulaire de circulation pour assurer la séparation des particules les plus lourdes par effet centrifuge, d'autre part, dans une seconde partie, en regard d'une électrode axiale (7) la vitesse de 15 circulation est réduite et le temps de séjour est long pour favoriser la séparation des particules plus légères par effet électrostatique. La présente invention dont les descriptions qui précèdent sont données à titre d'exemples non limitatifs trouve principalement ses applications dans le domaine du dépoussiérage et de l'épuration des effluents gazeux de toutes natures, en particulier pour l'épuration des fumées 20 de combustion de biomasse, des gaz de pyrolyse, etc. In all cases a double-acting dust collector according to the invention has two distinct and consecutive zones (11) and (12). Following the direction of circulation, immediately after admission to the apparatus the gas to be purified acquires a high angular velocity of circulation to ensure the separation of the heavier particles by centrifugal effect, secondly, in a second part, in With regard to an axial electrode (7) the circulation velocity is reduced and the residence time is long to promote the separation of the lighter particles by electrostatic effect. The present invention, the preceding descriptions of which are given by way of non-limiting examples, is mainly applicable to the field of dust removal and purification of gaseous effluents of all kinds, in particular for the purification of combustion fumes. biomass, pyrolysis gases, etc.

Claims (6)

REVENDICATIONS1) Dépoussiéreur à double effet centrifuge et électrostatique caractérisé par le fait qu'il est constitué de deux zones distinctes et consécutives contenues à l'intérieur de tubes co-axiaux, qu'il comporte des moyens destinés à mettre en rotation le flux gazeux à épurer lors de son admission dans le tube amont (1) qui englobe la zone (11) ou s'exerce l'effet centrifuge et comporte une électrode à haute tension (7) placée dans l'axe et sur toute la longueur du tube aval (2) relié à la terre, dont la paroi interne constitue l'anode de la zone (12) ou s'exerce l'effet électrostatique. CLAIMS1) Dust collector double centrifugal and electrostatic characterized in that it consists of two separate and consecutive zones contained inside coaxial tubes, it comprises means for rotating the gas flow to purify during its admission into the upstream tube (1) which includes the zone (11) or exerts the centrifugal effect and comprises a high voltage electrode (7) placed in the axis and over the entire length of the downstream tube (2) connected to the earth, the inner wall of which constitutes the anode of the zone (12) where the electrostatic effect is exerted. 2) Dépoussiéreur à double effet centrifuge et électrostatique selon la première revendication caractérisé par le fait que les moyens utilisés pour mettre en rotation le flux gazeux peuvent être une admission tangentielle des gaz dans un espace (4) constitué entre les deux tubes amont (1) et aval (2) concentriques ou bien un déflecteur (17) muni de pales placé au débouché d'une tuyère (16) d'injection des gaz coaxiale et précédant les tubes amont (1) et aval (2). 2) Dust collector with double centrifugal and electrostatic effect according to the first claim characterized in that the means used to rotate the gas flow may be a tangential admission of gases in a space (4) formed between the two upstream tubes (1) and concentric downstream (2) or a deflector (17) provided with blades placed at the outlet of a nozzle (16) coaxial gas injection and preceding the upstream tubes (1) and downstream (2). 3) Dépoussiéreur à double effet centrifuge et électrostatique selon la première revendication caractérisé par le fait que le tube aval (2) en regard de l'électrode (7) est dimensionné pour que la vitesse du flux gazeux dans la zone (12) à effet électrostatique soit de l'ordre de 1 à 3 m/s et le temps de séjour d'au moins 1/2 seconde. 3) centrifugal and electrostatic dust collector according to the first claim characterized in that the downstream tube (2) opposite the electrode (7) is dimensioned so that the velocity of the gas flow in the zone (12) effect electrostatic is of the order of 1 to 3 m / s and the residence time of at least 1/2 second. 4) Dépoussiéreur à double effet centrifuge et électrostatique selon les revendications précédentes caractérisé par le fait qu'il comporte des moyens (13) permettant de mettre en vibration le tube aval (2) et que la jonction de ce tube avec le corps de l'appareil se fait par un joint souple (14) permettant au seul tube aval (2) et à l'électrode (7) de vibrer avec une amplitude suffisante pour décoller les poussières. 4) Dust collector centrifugal and electrostatic double effect according to the preceding claims characterized in that it comprises means (13) for vibrating the downstream tube (2) and that the junction of this tube with the body of the The apparatus is provided by a flexible joint (14) allowing the only downstream tube (2) and the electrode (7) to vibrate with a sufficient amplitude to take off the dust. 5) Dépoussiéreur à double effet centrifuge et électrostatique selon les revendications précédentes caractérisé par le fait qu'il comporte des moyens permettant de couper l'arrivée de la haute tension sur l'électrode (7) et de rendre momentanément positif le tube aval (2) durant les opérations de nettoyage, le joint souple (14) étant aussi électriquement isolant. 5) Dust collector centrifugal and electrostatic double effect according to the preceding claims characterized in that it comprises means for cutting off the arrival of the high voltage on the electrode (7) and momentarily positive the downstream tube (2 ) during the cleaning operations, the flexible seal (14) being also electrically insulating. 6) Dépoussiéreur à double effet centrifuge et électrostatique selon les revendications précédentes caractérisé par le fait qu'il comporte des moyens tels que des volets (15) permettant de stopper la circulation du flux gazeux dans un élément pendant son nettoyage. 6) Dust collector centrifugal and electrostatic double effect according to the preceding claims characterized in that it comprises means such as flaps (15) for stopping the flow of gas in an element during its cleaning.
FR0805863A 2008-10-22 2008-10-22 DOUBLE EFFECT DUST COLLECTOR Active FR2937264B1 (en)

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FR3073430A1 (en) * 2017-11-14 2019-05-17 Christian Huret Leclerc ELECTROSTATIC DEODUSING MODULE
CN112915707A (en) * 2021-01-26 2021-06-08 中国科学院过程工程研究所 Coupling cyclone electric bag particle separation device and separation method

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CN112915707A (en) * 2021-01-26 2021-06-08 中国科学院过程工程研究所 Coupling cyclone electric bag particle separation device and separation method

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