FI115118B - Method and apparatus for collecting particulates from a gas stream - Google Patents

Description

115118

Method and apparatus for collecting particulates from a gas stream - Förfarande och anordning for uppsamling av partiklar frän en gasströmming

The invention relates generally to the separation of substance states and in particular to the separation of the gaseous phase of an aerosol from a particulate phase, which may be solid and / or liquid.

Separation of particulate solid or liquid from gaseous is an old industrial problem in the field of manufacturing technology, purification and sampling. Separation may be part of the process 10 intended to recover a portion of the material moving with the flow, or to prevent, at least in part, the passage of a particular portion past the separator. Onglema is well known both in industry and laboratory. There are many solutions to the problem, based on different techniques applied from slightly different perspectives, under conditions of use and amounts of material, as well as temperature and chemical environment.

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The effect of static electricity on smoke was known long before electricity was known as such. As early as the 19th century, electricity was also used to separate particles. An electrostatic filter for purification of industrial gases became more common in the 20th century and is known from early wire-tube filters and more recent plate-to-plate and 20-wire plate-type devices that supply electricity to one electrode to provide an electric field between said and another electrode. to collect particles. In this case, the device is often dimensioned so that the electric field also charges as it collects. There may be a plurality of collecting fields in a modern device in the direction of flow of gas to be treated. The electrostatic filter is described as · ;;; 25 with regard to the charge-off effect of the corona discharge as compared to the electric-field collection effect • «» 'for various uses quite thoroughly, for example in [1] Industrial; '· Electrostatic Precipitator, Harry White 1963, incorporated herein by reference; to refer to the description of the technology. One disadvantage of an electrostatic filter is • V; the problems encountered in fine particle collection, as well as their solution. · * ·. 30 large size of electric filter used. In addition, the probability of charging is often quite low in the samplers, and thus the particle yield to the collection medium may be modest. For example, statistical analysis of nanoparticle particles can then be <· * rather deficient.

Prior art electrodynamic devices, derivatives of the Millikan chamber, modified to hold a single charged particle for analytical purposes were known. In this case, a single charged particle floats on electric fields: without touching the substrate or other surface. The individual charged particle is then • centered on the center axis of the tubular electrode by an electro-dynamic alternating electric field 40, whereby the particle is floated by a rotational geometric electric field near the center of the chamber. Quite often, a DC voltage field of 2,115,118 can also be used to adjust and hold the position of the particle on the center axis of the torus electrode, for example, for study centered on a laser beam. Similar techniques that follow the Pico Balance principle are widely known as sample holders or the like, as widely described by Aerosol Science and Technology in A History of Single Aerosol Particle Levitation, 1997 by James Davis 5. In addition, a number of different sample holders for vacuum applications are known in which, in a similar manner, the ionized material is held in a specific location for examination. Said reference [2] is incorporated herein by reference for reference to the description of prior art.

It is also known to use a complex device for taking a particle sample described in U.S. Patent No. 5,439,513 to Perisiamy, 1994. However, it describes a rather complicated structure with a large number of precision-machined electrodes and electric fields between them to be controlled, whereby reliability may prove to be a limiting factor in addition to the number of precision parts and manufacturing costs.

It is an object of the invention to provide a new simple and compact device and method for collecting particles from a filing gas, whereby the particles can be separated from the gas stream, at least in part, without the above-mentioned drawbacks of the prior art. This object is achieved by the device and method according to the invention.

The device according to the invention is characterized by what is said in the characterizing part of the independent claim.

The method according to the invention is characterized by what is said in the characterizing part of the independent claim.

I <t

The device arrangement according to the invention is characterized by what is said in the characterizing part of the independent claim relating thereto.

: '; *; 30

Other preferred embodiments of the invention are disclosed in the dependent claims.

;;; The device according to one embodiment of the invention has a certain rotation symmetry; * 'axis-symmetrical AC electrode for providing dynamic electric field and; A pair of DC electrodes, mimicked to provide a substantially static electric field parallel to said axis of rotation symmetry in the separation chamber of the device between a pair of certain DC electrodes. The apparatus further comprises an inlet flow passage for introducing a sample aerosol into the separation chamber of the apparatus, an outlet passage from which the treated aerosol can be degassed, and a collecting electrode 40 for tracking the collecting pad 115 on the In an apparatus according to one embodiment of the invention, the AC electrode is mapped so as to at least partially surround the separation chamber, and the inlet flow channel is preferably mimicked to direct the incoming aerosol stream upon arrival at its separation chamber, preferably toward the rotation element. way.

According to a preferred embodiment of the invention, the input current channel passes through a first DC electrode. The separation chamber may also have a side flow passage from which a second aerosol stream or gas stream may be introduced into the separation chamber. Most preferably, the AC electrode is of a torus-shaped or shaped rotary body 10 with respect to the axis of rotation symmetry. The AC electrode is arranged to be coupled to provide an alternating field to the separation chamber by a voltage having a certain frequency, amplitude and waveform, each of which may be independently adjustable. By means of an alternating electric field, according to the geometry of the AC electrode, the charged aerosol particles entering the separation chamber are subjected to a net force component concentrating them towards the axis of rotation symmetry, the central axis of the AC electrode. The DC field ensures that the aerosol particles deposited on the collection tray are directed to the collection tray.

In a method according to an embodiment of the invention, by means of the tubular 20 AC electrode and its electro-dynamic field, the charged aerosol particles arriving at the separation chamber are centered on the axis of rotation symmetry to collect the charged aerosol particles. In a method according to an embodiment of the invention, the particles to be collected are also subjected to an electrostatic force, in the direction of the axis of rotation of the collection chamber, to collect charged aerosol particles at a collection object, e.g. which is connected to the DC electrode. Accumulating aerosol particles are collected on a collecting tray, according to an embodiment of the invention, continuously.

'(: The remainder of the aerosol is discharged into the discharge channel, for example, a pair of DC electrodes;': through a hollow portion tracked in proximity to the second electrode and / or for the purpose of the AC electrode and through holes in the separation chamber. The AC electrode, which is either hollow or provides a hollow space with, for example, a separation chamber wall, is preferably provided with a groove having holes on the side of the separation chamber to drain the gas portion of the treated aerosol gas phase from the separation chamber, The net force of the AC electrode centers the charged collected aerosol particles toward the axis of rotation symmetry.

It is obvious to a person skilled in the art that the device according to the invention, the EDP device, can collect mainly charged particles by its electric fields, but also other mechanisms of accumulation can cause some particle accumulation. If neutral particles are collected with the EDP-4 115118, they must first be charged before the separation chamber by a charger, which may be a separate charger according to the prior art or a charger integrated in the inlet flow channel. The charge may be based on radioactivity and / or corona discharge (for example, an electric filter or a 5 degree charge of one). The accumulator may then have corona discharge means for effecting the corona discharge. The device according to one embodiment of the invention has fastening means for a collection tray, such as a TEM (Transmission Electron Microscope) grid or the like. The fastening means may be mechanical and / or electromagnetic. The collecting tray can then be, for example, a TEM lattice for microscopic analysis, but also a silicon tray having a sufficiently smooth surface suitable for AFM analysis.

Preferred embodiments of the invention will now be described in more detail by way of example with reference to the following figures, wherein: Figure 1 is a sectional view of an electrodynamic EDP device according to a preferred embodiment of the invention; -electrode.

Fig. 2b shows a detail of the example of Fig. 2, and · · 25 Fig. 3 schematically illustrates a preferred embodiment of the invention »· *« *,; circuitry to form a cascade.

· ... · The pictures use the same numbers as the equivalent parts. Other advantages of the invention; Embodiments are described in the dependent claims, wherein the disclosed features 30 may be freely combined to describe other embodiments of the invention, as appropriate.

A sectional diagram of a device according to a preferred embodiment of the invention is shown in Fig. 1. In it, the section is made at a level 35 parallel to, for example, the axis of symmetry 118 of the AC electrode 107.

1 shows a simple EDP device 100 with one EDP degree. Breast and / or »: serial connection with other and / or EDP devices is illustrated as an example in connection with Figure 3 40. It is also noted that the device according to the embodiment of Figure 1 represents an example of a laboratory scale device with appropriate voltage values. The device 5115118 can then also be scaled on the basis of the exemplary values shown in the invention to mechanical dimensions but also to a smaller scale. In this case, based on the free space of the chamber and the values of the electric quantities shown, the magnitudes of the voltages required to generate the corresponding electric fields can be estimated as some design parameters. On a larger scale, it can be used for industrial scale devices up to several meters in diameter, but also on a smaller scale for fine-mechanical EDP devices on a near microscopic scale.

An EDP device according to a preferred embodiment of the invention has end pieces 102 and 103 and a wall 101, a tubular AC electrode 107, after being connected to an AC voltage source 113 having a certain waveform, frequency and maximum value relative to a reference potential 210, for example. The torus may also be modified, but most preferably rotationally symmetrically. The curvature of the AC-15 electrode 107 is shown in Figure 1 such that the surface of the AC-electrode 107 is curved inward, toward the axis of rotation symmetry. In this case, the large circle defined by the point 107 of the narrowest AC electrode defines a plane substantially perpendicular to the imaginary axis of rotation symmetry 118 of the chamber. According to another preferred embodiment of the invention, the curvature direction 20 of the AC electrode 107 on the side of the separation chamber is opposite to that shown in Figure 1. The surface shape of the AC electrode on the side of the separation chamber plays a role in the shape of the AC field. In the case of a hollow AC electrode, another form of the electrode has its own significance in providing a suitable steady flow of the gas exiting • the J. hollow AC electrode.

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The apparatus of Figure 1 according to one embodiment of the invention also has DC electrodes 104 and 105 disposed at the narrowest point '· · of the tubular AC electrode 107. * on both sides, symmetrically rotatable on an axis of rotation symmetry: 118 in cross-section according to Fig. 1, curved surfaces of electrodes 104, 105; 30 facing in opposite directions of curvature. The curvature directions of the DC electrodes 104, 105 may also be parallel to one another in accordance with a preferred embodiment of the invention. According to yet another embodiment of the invention, both DC-! the directions of curvature of the electrodes 104, 105 are opposite to those of Fig. 1; Figure 1 is confined to showing only one example of the invention; 35 curves. It is noted that with the AC electrode 107 *; said electrode shapes with curves can be combined with various DC electrode shapes with curves to illustrate various embodiments of the invention. The electrode 105 is preferably insulated with the insulator 106 from the other device.

Figure 1 shows that electrode 104 has a hole 111 for the inlet flow passage to direct aerosol flow to the separation chamber 112. Through the DC electrode 105 passes a 115118 insulating sleeve 108 containing a conductive material holder 109 to hold the collecting tray 110 in the center of the electrode 105 sample tray, as shown. Preferably, the collecting pad 110 may be arranged to be coupled to a specific reference potential, e.g., ground potential, 5 (such as in Figure 2), or to the potential generated by the collisional voltage difference (such as, for example, Figure 1) with respect to ground potential. Here, for example, a negative voltage to the ground on the collection pad can be applied to the positively charged particles. The gas purified from duct 115, outlet 116, and outlet 117 may be discharged from the EDP-10.

According to one embodiment of the invention, the AC electrode may be hollow for conveying a flow of gas through the surface of the AC electrode away from the separation chamber through the gas holes, openings, leading to the hollow space. The openings are most preferably located at the bottom of the grooves machined on the surface of the AC electrode 117b to maximize the effect of the net force component. The curvature may then vary on the surface of the AC electrode, depending on the shape of said grooves. Fig. 2 illustrates an EDP device 200 of the present invention having a hollow AC electrode 117b and an aperture 202 as part of a plurality of openings through which gas can be introduced from the separation chamber 112 into the hollow AC electrode interior 201 and further out of the passage 207. 2 illustrates a cross-sectional view of an AC-20 electrode showing an aperture 202 for introducing gas into the hollow space 201 within the AC electrode, but it is obvious from the invention that there may be a plurality of openings of the same or / or location on AC electrode 117b for other openings:. in relation to. The opening 202 on the side of the separation chamber may be similar to the cross section _ ·; 2, but preferably located in a groove or recess. The part of the electric field at the edge of the recess may then target: "the aerosol particles towards the net component of the separation chamber away from the opening · ... * itself, while the neutral gas may flow from the opening into the hollow section 201 of the AC electrode 117b.

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The device of Fig. 2 shows two DC voltage sources connected in series and a connection point 211 connected to a reference potential 210 shown in the following:! in the example the second pole of the sample holder 109 and the AC voltage source 113 are also connected. The first terminal of the AC voltage source 113 is connected to the 212 AC electrode IIb. Preferably, the electrode 105 is connected to a terminal of voltage source 114 of 214 having the same polarity as the particles to be collected, but electrode 105 may also be at 0-voltage. Similarly, electrode 104 may be connected to 213 having the same polarity as the particles to be collected , or at a voltage of 0. In this case, by selecting: polarity, the accumulation of charged particles on electrode surfaces 40 other than sample substrate 110 in Fig. 2b may be limited. The DC voltage may be steady as battery voltage or also pulsating such as rectified unfiltered DC.

7, 115118

In Figure 2, the shaken gas can be led out of the conduit 207. The gas purged from the conduit 115 may be conducted through the conduit 203, for example to the next degree, which may be similar to the apparatus of Figure 1 or 2, or any other device, e.g. From conduit 115 and / or conduit 207, gas 204, 205 can be recirculated through a suitable conduit. Thereby, said gas may be introduced into the same EDP device 200, for example, into a lateral flow passageway 119, or said gas may be introduced through a pipeline 204,205,206 mutatis mutandis to another device upstream and / or downstream of device 200, as appropriate.

Fig. 2b illustrates in detail 222 the sample holder of Figs. 1 and 2. Fig. 2b shows a specimen holder 109 and a collecting tray, a specimen tray 110, on one surface thereof. In addition, an insulating sleeve 108 is also depicted. For example, the sample holder 109 may be magnetic so that, for example, a nickel TEM grid (Transmission Electron Microscope) can be used as a sample substrate 110. The sample substrate 110 may also have a particularly flat portion, e.g., a silicon substrate for AFM analysis (Atom Force Microscope).

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Figure 3 illustrates a device cascade 300 according to an embodiment of the invention. It has a device 1310, a device 2 311, a device 3 312 and a device 4 313. The devices are connected by flow illustrating arrows. Flow 301 is the inlet flow of the device cascade. Flow 302 is the inlet flow of the device 2 311, but at the same time an outflow of J. i 25 of the device 1310. Device 1 310 is provided with a second inlet flow 309 and device 2,; 311 is further plotted with inlet flow 308. The streams 308 and 309 are taken from the outlet flow 307 of device 4: The device 4 may be, for example, an EDP device 200 as shown in FIG. are charged particles, \ '· they can be collected by an EDP placed on the 1310 position of the device. In a cascade you can: ''; 30 may also be another EDP device, for example device 2 311, which is in communication with device 1310, to maximize collection efficiency in the flow through the devices. Devices 3 312 and 4 313 are connected in parallel with their input currents 303 and 306 as shown in FIG. 303 and 306 in said stiffening. The devices 3 and 4 may be EDP devices, for example according to the EDP device 200 of Figure 2. Parallel connection is obtained; ; ': 35 times greater flow to process than one device. Outflow 304 of device 3 312 ·. and the outlet flow 305 of the device 4 is marked in the figure. These currents can be taken from the output of each EDP device, for example, in the case of the device of Figure 2, from channel 207: and / or channel 116.

40 Of the aforementioned devices (devices 1-4 of Table 1), one of the 311, 312, 313, 314 may be an electric filter (ESP), an electric mobility analyzer (DMA) or a charger (VAR).

8 115118 As an extreme example of a device, a bypass flow channel (OVK) is also considered as such. The electric fields of the EDP collect charged particles. In this case, one skilled in the art will know, according to the invention, that most preferably the electric filter or other accumulator is located upstream of the EDP device, or a group thereof.

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Table 1. As an example of a device cascade according to an embodiment of the invention, arrangements 1-4 are provided wherein each device 2-4 can be selected such that the device cascade according to said arrangement has at least one EDP device ._____ Arrangement 1 Arrangement 2 Arrangement 3 Arrangement 4

Device 1 DMA VAR_ESP EDP_

Device 2 DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP,

OVK, EDP OVK, EDP OVK, EDP VAR, OVK, EDP

Device 3 DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP,

OVK, EDP OVK, EDP OVK, EDP VAR, OVK, EDP

Device 4 DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP, VAR, DMA, ESP, ___ | OVK, EDP OVK, EDP OVK, EDP VAR, OVK, EDP

For example, when the device 1 310 is a charger, it is advisable to place the EDP device in place of, for example, the device 2 311, or the device could be any EDP device 100, 200 or a combination of these. With device 311 there could be a second EDP device 200 to optionally collect collection efficiency, and a third EDP device 200 alongside it to provide greater flow in parallel with the chicken Saija. Based on Table 1 and as disclosed in the invention, one skilled in the art will be able to select equipment suitable for a cascade such that the cascade has at least one EDP device capable of collecting charged particles. Table 1 as such does not limit the number of EDP device combination combinations and switching possibilities with each other in parallel and / or Saija, nor does it per se allow EDP device switching variants to a device exodus. An EDP device according to the 20th embodiment. If EDP devices other than the invention are included in the cascade discussion, it is also clear that the devices may have different flows in and out, so that one skilled in the art can provide each of said other devices with a suitable flow and / or power feed. by. The description in Table 1 also shows a number of other device cascades, but to be in accordance with an embodiment of the invention, the device cascade must have at least one EDP device. It is further noted that not all EDP combinations shown in Table 1 are preferred embodiments of the invention; In a device cascade having at least two EDP devices and / or degrees and thus two AC electrodes 107, their curves may have different cross-sections, also viewed from the side of the separation chamber 112.

9, 115118

Fig. 3 is an exemplary diagram of an EDP device according to an embodiment of the invention connected in cascade to a plurality of EDP devices according to, for example, Fig. 1 and / or Fig. 2. The device then has a first stage and a second stage connected to each other from the first output to the second stage input. The second-order inlet may be upstream or downstream, for example to provide recirculation. The flow from the first-order output can also be derived to a parallel second-order formed by another similar EDP device, although only one second-order 10 is drawn in the figure for simplicity. To optimize operation, each step of the cascade can be provided with its own AC and / or DC controls or settings if the other device in the cascade is an EDP device. Although not depicted as one EDP device for another device, the other device may also be, for example, an electronic mobility analyzer known per se, an electric filter or a charger, and also a device cascade arrangement according to Table 1. In this case, for example, an electronic classifier can be used to select particles of a certain mobility for collection on an EDP device. The particles can also be charged separately on a separate charge prior to the degree formed by an EDP device, even though, for example, particles in the air naturally have a certain charge distribution. This has the advantage of providing more charged particles and higher particle yields than uncharged aerosols.

There may also be a plurality of corresponding degrees arranged either in series to maximize the effect of repetitive operation or to increase the operating capacity of the parallel. It is also possible to track feedback to derive the once treated aerosol component from, for example, channel 115 or its extension, for example, by 'tube and / or channel for reprocessing, with either an EDP stage, a functional precursor of the scroll' '* in the upstream direction and / or , · * Downstream. In this case, a supply channel 119 and / or a main flow channel 111. may be used. The skilled artisan will recognize that; the voltages and currents at different degrees may be different to optimize the collection efficiency of each stage.

; According to one embodiment of the invention, the collection tray may alternatively be placed on a DC electrode 104, 105, as previously described, in a form of a film thereof; 35 having a thickness, and most preferably preformed to conform to the shapes of the DC electrode so that said film does not obstruct the flow of a flow in the vicinity or through the electrode to an undesirable extent or block the can. The film may be: insulation on one side and conductive material on the other. Another aspect of the invention; In an embodiment of the DC electrode or under said film, or a film 40 acting as a leading side of the DC electrode, to set the radiation detector of the radiation monitor, which is supplied from said film material 10 to cluster 115 118 in the radioactive material. The detector may be, for example, a sodium iodide detector, a germanium detector or any other detector known per se for the detection of radioactive substances.

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Claims (11)

11, 115118 1. A method of collecting particles from a flowing medium for sampling and / or purifying a gas, wherein the particles are electrically charged, introduced into a rotationally symmetric separation chamber through a gas stream through a space defined by an electrode, by the radial component of the annular AC field and the centered particles are guided to the collection point by a DC field which is perpendicular to said AC field component 10. 2. Apparatus for att uppsamla particle ur ur strömmande gas för provtagning och / eller preparation av gasen, vice apparat innefattar en separationskammare (112), en 5 inströmningskanal (111) för att leda gasströmmen till en separationskammare, en utströmningskanal (115, 116) , 117) för att led gasström ur separationskammaren (112), that uppsamlingssubstrat (110) i separationskammaren (112) and electroder (104,105,107,109) för att picture fält i separationskammaren (112) med avsikt atty stamra part skeleton som skall uppsamlingssubstratet (110), tilt paths av att 10 uppsamlingssubstratet (110) om belägen mittemot inströmningskanalen (111), som åppnas till separationskammaren (112), pulling omges av en AC-electrode (107) arrangerad for the image AC-Fält, -electrodes (107) and rotationsymmetric DC ordnad i relation till separationskammaren (112), och av att separationskammaren (112) access to motsaende sidor har rotationssymmetric DC The electrode for the separating chamber (112) is provided with a DC-Fält detector, som defmeras av AC electrode fertilizer stack. An apparatus for collecting particles from a flowing gas for sampling and / or gas purification, comprising a separation chamber (112), an inlet flow passage (111) for directing a gas flow into the separation chamber, an outflow passage (115, 116, 117) 110) in the separation chamber (112) and electrodes (104, 105, 107, 109) for generating an electric field in the separation chamber (112) for directing the particles to be collected to the collection target (110), characterized in that the collection target (110) (112) surrounded by an AC-20 electrode (107) tracked to generate an AC field, rotationally symmetrically with respect to the separation chamber, and having opposite rotation symmetric DC electrodes with respect to a narrow plane r defined by the narrowest point of the AC electrode (107, 117b). to create a field, a separator mmion (112). 3. Apparatus enligt patent krav 2, tilt screws av att uppsamlingssubstratet (110) and provided with uppsamlingssubstrat eller electrodes. Device according to Claim 2, characterized in that the collection target is a removable sample collection tray or an electrode part. 4. En apparat enligt patentkrav 2, kännetecknad av att i uppsamlingssubstratet är arrangerat en yta för parteposition, att like this en vskom film, ytan av et filmband eller den inre ytan av utrymme, som ligger efter ett frän separationskammare ledande undertryckbelastat häl. ! 25 5. Apparatus encompassing patent No. 2, the threading means of the AC electrode (117b) being annealed to the perforator (202) and the arrangement of the gas electrode (201) to the AC electrode (117b). : 6. Apparatus enligt patentkrav 5, rotary encoding av ac electrode; 30 (117b) har ett avlopsrör (207) för avlägsnande av gasströmmen med ställbar och / eller reglerbar strömhastighet. Device according to Claim 2, characterized in that the collection target has: an arranged surface for particle deposition, said surface being one of the following:. 30 liquid film surface, strip film surface, or inner tube surface in a post-vented state leading out of the vacuum chamber. A device according to claim 2, characterized in that the AC electrode (117b) has a first surface for perforating the gas flow to the AC electrode (117b) with a perforated (202). 35 inside the cavity (201). A device according to claim 5, characterized in that the cavity (201) of the AC electrode (117b) has an outlet tube (207) for venting the gas flow at an adjustable and / or adjustable flow rate. Device according to Claim 5 or 6, characterized in that it comprises, at least in part, a recirculation circuit of a gas flow of 2 115118. 7. Apparatus enligt patentkrav 5 eller 6, kännetecknad av att den har en ätminstone 'lotter teroppoppäppling av gasströmmen. :: 35 » 8. Apparatus according to claim 2, which comprises the uplinks of the DC electrodes (104, 105) and the electric current (104,105) of the DC electrodes (104,105). Device according to Claim 2, characterized in that the collecting base of the collection target is separated from the DC electrode (104, 105) so that an electric field can be connected between said collection target 5 and the DC electrode (104,105). 9. Apparatus Enhancement Patent No. 2, Turning Attack AC-Electrode (107) Har E Urine Conical Section Mrledbart Transmitter & Atten (107) Har E Attach Shape Electric E 115118 j fait, som har en maximal torque, frequency och vagform. Apparatus according to claim 2, characterized in that the AC electrode (107) has a conic derivative cross-section and is (107) imaged to form an electric field having a certain maximum intensity, frequency and waveform. 10 10. Apparatus enligt blinking the Heist av patent kraven 2-9 rotating node av electrode DC electrodes (104, 105), the som ir ordnats för att copy en strälningsdetektor in i 5 DC electrodes. Apparatus according to any one of claims 2 to 9, characterized in that it has a DC electrode (104, 105), which is tracked for connecting a radiation detector to said DC electrode. 11. A device arrangement comprising a first device tracked for gas flow in parallel and / or interconnected with another device, characterized in that said first device is a device for collecting particles from a flowing gas for sampling and / or purifying the gas comprising a separation chamber ( 112), to direct gas flow of the inlet flow passage (111) to the separation chamber, to discharge gas flow out of the separation chamber (112), to the collecting object (110) in the separation chamber (112) and electrodes (104, 105, 107, 109) to generate an electric field guiding the particles to be collected to the collection point (110), the collection target (110) facing the inlet flow channel (111) which opens into a separation chamber (112) surrounded by an AC electrode (107) arranged to generate an AC field rotationally symmetrically with respect to the separation chamber; on the opposite sides of the chamber are: * · rotationally symmetrical DC electrodes to generate a DC field perpendicular to the plane defined by the narrowest point of the AC electrode (107, 117b) in the separation chamber (112), and wherein said second device is one of electric; . 30, a motion analyzer, an electric filter, a charger and said first device. Patenkrav • 1. En method för att uppsamla parturar ur ett strömmande medium för provtagning. 35 och / eller organizing av gas, i am using method particle, som scall uppsamlas, laden electric, led med en gasström account en rotationssymetrisk separationskammare genome »thats part somar begränsat av en electrodes, att partarl blir styrda mot ett: uppsamlingsspstrat med h av electric falt, teleconverting av att partikama, som är: riktande frän strömmen mot uppsamlingssubstratet, centreras med en radiel component 40 accounts et ringformigt AC-falt, som rictat i strömmens tvärrikting, och centrerade partyrar mot uppsamlingssubstret Business Corset Tips for Components to This AC-Falt, 3,115,118 11. En apparatanording, som innefattar en första apparat anordand fran gaströmmen sett parallellt och / eller i serie kopplad med en annan apparat, attnant apparat for första upsamla partur ur ur strömmande gas för 10 provtagning och / eller av gasen, apparel apparat innefattar en separationskammare (112), en inströmningskanal (111) för att leda gasströmmen account en separationskammare, en utströmningskanal (115, 116, 117) för att leda gasström ur separationskammaren (112), ett uppsamlingssubstrat (110) i separationskammaren (112) och electroder (104, 105, 107, 109) fört picture et electriskt Fält i separationskammaren 15 (112) med avsikt att styra particle scales uppsamlingssubstratet (110), i wear clothes uppsamlingssubstratet (110) a non-instructing channel (111), a separate account separationskammaren (112), an omnidirectional AC electrode (107) arranging the image of the AC wall, activating the AC electrode (107) and rotating the symmetry connection to the separating chamber (112), och av att 20 separating the chamber (112) to the motsaende sidor har rotation symmetric DC electrode for the separating chamber (112) , som defineras av AC-electrode fertilizer stoll, och att nämda andra apparat är en av föjande: en elektrisk mobilitetsanalysator, et electrofilter, en laddare och en nämnd första apparat. »T