NL2018719A - Device for removing particles from the air and removing smog and method for use thereof - Google Patents

Device for removing particles from the air and removing smog and method for use thereof Download PDF

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Publication number
NL2018719A
NL2018719A NL2018719A NL2018719A NL2018719A NL 2018719 A NL2018719 A NL 2018719A NL 2018719 A NL2018719 A NL 2018719A NL 2018719 A NL2018719 A NL 2018719A NL 2018719 A NL2018719 A NL 2018719A
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Netherlands
Prior art keywords
filter
air
particles
transport channel
flow
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NL2018719A
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Dutch (nl)
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NL2018719B1 (en
Inventor
Van Der Burg Simon
Willem Van Wees Peter
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Van Wees Oil B V
Van Der Burg Simon
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Priority to NL2016610 priority Critical
Priority to NL2016050739 priority
Application filed by Van Wees Oil B V, Van Der Burg Simon filed Critical Van Wees Oil B V
Publication of NL2018719A publication Critical patent/NL2018719A/en
Application granted granted Critical
Publication of NL2018719B1 publication Critical patent/NL2018719B1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02Plant or installations having external electricity supply
    • B03C3/04Plant or installations having external electricity supply dry type
    • B03C3/14Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155Filtration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/38Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation, flames
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2259/00Type of treatment
    • B01D2259/80Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/818Employing electrical discharges or the generation of a plasma

Abstract

A device is provided for cleaning air contaminated with solid particles. The device comprises an air transport channel with a supply opening for supplying ambient air into the air transport channel and an output opening for removing air fed through the air transport channel from the device, as well as an ionizer placed in the air transport channel for ionizing the air flow and particles present therein. The device comprises at a position located between the ionizer and the outlet opening a filter with a pore size that is larger than the size of at least a part of solid particles present in the supplied air and to be removed therefrom and wherein the flow-through surface of the device is near the ionizer is smaller than the flow-through area of the device near the filter on the upstream side thereof.

Description

DEVICE FOR REMOVING PARTICLES FROM THE AIR AND REMOVING SMOG AND METHOD FOR USE THEREOF
The present invention relates to a device for cleaning air contaminated with solid particles, comprising an air transport channel with a supply opening for supplying ambient air into the air transport channel and an outlet opening for removing air fed through the air transport channel from the device, as well as a ionizer placed in the air transport channel for ionizing the air stream and particles present therein. The invention also relates to a filter and to a method for the use of the device in removing solid particulate contaminants from the air.
Such a device is known in the art. For example, the cleaning tower from Roosegaarde is known with which air is stripped of particulate contaminants by exposing the air to an ionizer.
However, such a device does not work optimally. The removal of particles is only limited due to the limited scope of the conductors.
There is therefore a need for an improved device for cleaning air by removing solid particles therefrom, in particular by means of an ionizer.
It is noted that WO 01/34854 discloses a method and apparatus for particle agglomeration in which fine particles of dust and other contaminants in gas streams are agglomerated into larger particles that are more easily filtered in downstream processing. In one embodiment, particles are charged in successive portions of the gas stream with opposite polarity and the gas stream is delayed in an Evasé portion (12). Particles of different sizes have differential delays thereby generally mixing in the flow direction, leading to agglomeration of oppositely charged particles. In another embodiment, a gas stream is divided into partial streams in respective parallel channels, and the particles in adjacent channels charged against opposite polarity. Deflectors at the downstream end of the passages cause partial streams of particles of opposite polarity to mix, resulting in agglomeration of oppositely charged particles. Fine dust particles and other contaminants in gas streams entering a channel (10) are agglomerated into larger particles that are more easily filtered in downstream processing. Particles in consecutive portions of the gas stream are charged by an AC ionizer (14) with opposite polarity and the gas stream becomes in an Evasé part (12) to slow it down. Particles of different sizes have differential delay and therefore generally mix in the flow direction aided by vibrators (13), leading to agglomeration of oppositely charged particles.
Further ionization flashers are known from EP 0 403 230 A1, US 2009/0084265 A1 and US 2013/0255231 A1.
The invention has for its object to provide an improved device of the type mentioned in the preamble.
In particular, it is an object of the invention to provide a device of the type mentioned in the preamble which can provide excellent removal of particles and in which substantially the entire air stream treated by the device can be stripped of solid particles originally present therein.
In order to obtain at least one of the aforementioned advantages, the invention provides a device according to a first embodiment which comprises the following measures: device for cleaning solid-contaminated air, comprising an air transport channel with a supply opening for feeding into the air transport channel of ambient air and an outlet opening for removing air fed through the air transport channel from the device, as well as an ionizer placed in the air transport channel for ionizing the air flow and particles present therein, the device being situated at a position between the ionizer and up to the side of the outlet opening comprises a filter with a pore size that is larger than the size of at least a part of solid particles present in the supplied air. This device has the advantage that the removal of solid particles can easily be 100%. Such a simple method of cleaning the air is an unexpected result.
It has also been found that the filter containing the captured particles that is used in the device according to the invention can be reused in an inexpensive manner. For example, the filter can be used as insulation material in construction. Such a synergistic operation of the device according to the invention is completely unexpected. The filter can easily be reused by grinding the entire filter, together with the contaminants caught, and processing it into concrete as a granulate. It can also be used as material for processing into subsoil for roads. The contaminants are effectively locked up and inactivated.
The invention therefore relates to a device for cleaning air contaminated with solid particles, comprising an air transport channel with a supply opening for supplying ambient air into the air transport channel and an outlet opening for removing air fed through the air transport channel from the device, and a ionizer placed in the air transport channel for ionizing the air stream and particles present therein, which device is characterized in that it comprises a filter having a pore size that is larger than the size of the pore size at a position between the ionizer and up to the outlet opening side at least a part of solid particles present in the supplied air. The filter is preferably placed at the end of the air transport channel, but may optionally be located at a position before it. This is particularly advantageous if the filter could get wet in rain, snow or the like. A canopy between the filter and the end of the device could prevent the filter from wetting.
A moist filter may on the one hand provide an increased filter effect but on the other hand may give a higher resistance to the air flow, whereby the power demanded by the device, when using a fan to pass the air through the device, will increase considerably.
It is preferred that in the device according to the invention the filter has a pore size that is greater than at least 80% of the solid particles present in the supplied air. As a result, in practice a substantially complete capture of the solid particles is obtained because the particles clump together because of the ionization and thus have a larger size than the individual particles. They will therefore nevertheless be captured in the filter. The larger pore size of the filter ensures that the resistance through the filter is significantly lower than that of a filter with a smaller pore size. Such an advantageous combined effect is surprising.
A further reduction of the resistance is obtained when the flow-through area of the device near the ionizer is smaller than the flow-through area of the device near the filter. The air speed through the filter is therefore lower than the air speed through the rest of the device, for example at the ionizer and the fan, which provides a high efficiency to the device.
The flow-through surface can vary by a factor of between 5 and 10 per meter in the air flow direction, for example by a factor of between 6-8 per meter, in particular around 7.5 per meter. For example an increase of a round tube with an inner diameter of 0.8 m, or a flow-through area of n (0, 8/2) 2 = 0.503 m2, to a rectangular shape of inside 1.22 mx 1.85 m = 2.277 m2, over a length in the air flow direction of 0.6 m, which amounts to a surface enlargement of the through-flow surface of approximately 7.5 times per meter of flow length. Such a course can be obtained by placing walls of the air transport channel at an angle of 45-70 degrees, in particular approximately 60 degrees with respect to a longitudinal axis of (the air transport channel of) the device.
A device which is easy to construct is obtained when the air transport channel has a substantially rectangular flow-through surface over at least a part of its length. The device can then simply be manufactured from rectangular plate materials. In particular, this is also advantageous when mounting the filter, since a rectangular filter usually has little to no material losses during production. The operating costs of the device, in particular the filter costs, will hereby be minimal.
The device can be rotatable relative to a fixed carrier and / or an undercarriage, in particular about a substantially vertical axis of rotation. As a result, an orientation of the device relative to the environment can easily be varied, for example to adjust the device relative to a wind direction. The device can be provided with a drive unit, which can be wired and / or wirelessly remote controlled. In addition or instead the device can be passively rotatable, for example as a wind vane rotatable under the influence of the wind, in particular for this purpose the device can be provided with one or more wings and / or protruding control surfaces.
In order to enable effective operation that is not dependent on the weather conditions, such as the wind, the device comprises a fan provided in the air transport channel for passing air to be cleaned through the device. A fan can also enhance an existing natural air flow.
Effective transport of the air to be cleaned is obtained in particular if the air transport channel at the area of the fan has a substantially circular surface. The fan, which will generally also have a circular diameter, can hereby be placed effectively and efficiently in the air transport channel.
The device may therefore comprise a widening near the transition from the air transport channel to the filter, which preferably also comprises a transition from a circular cross-section to a rectangular cross-section.
The clumped, or agglomerated, particles will have a charge because of the ionizer. In order to effectively remove the agglomerated particles in the filter, it is preferred that the filter be grounded. The filter can also be assigned an opposite charge with respect to the ionized particles, which can further improve the capture of the particles.
An effective removal is obtained just when the filter material is electrically conductive in order to obtain an optimum capture of the charged particles. Particularly preferred is a filter comprising a carbon-containing material, which has both excellent electrical conductivity and therefore very effectively and efficiently captures the ionized and agglomerated particles.
An additional advantage of the device according to the invention is that ozone is also removed from the air fed through the device. The system is not exactly clear, but the ionization probably causes ozone molecules to meet each other more quickly and to be converted into oxygen molecules. Another possibility of operation is based on the filter which, due to the ionized particles and their grounding, causes ozone molecules on the filter to be converted into oxygen molecules.
A surprising effect is furthermore that the device according to the invention is suitable for substantially completely removing the so-called pmlO and pm2.5 particles (particles with a size smaller than 10 and 2.5 micrometers respectively). For example, the air is passed through the filter at a speed of 4 to 8 m / s so that the cleaned air can partially return to the supply opening of the device to be treated again. The high effectiveness in the removal of very small solid particles from the air makes the device according to the invention a true "smog killer".
An efficient collection of the contaminants, in particular the aggregated particles, is obtained when the filter comprises at least two layers of filter material which are enclosed in a housing, such that the layers of filter material are successively passed through the air to be cleaned. The filter material can be a non-woven material that is commonly used in air filter boxes, such as for air conditioning systems, but as mentioned above, preferably comprising a carbon material as an additive. The carbon material may be in powder form, for example 100 mesh size or smaller for 90% of the particles, and it may in particular be provided as active carbon. The filter material can suitably be 15 mm thick. When used in a double layer, the total thickness is therefore 30 mm. A thicker layer ensures better capture of the (ionized) particles. However, a thinner layer thickness even up to a few mm may also suffice.
The layers of filter material are preferably separated from each other by means of the housing, which housing is preferably made of a non-woven or woven material. The housing can be an envelope of cotton or linen or the like, such that the filter material is enclosed within it.
A preference is furthermore for a device in which at least two ionizers are provided in the air transport channel. This provides an even distribution of ionization to the air to be cleaned through the device.
In particular, it is preferred here that the ionizers are then provided substantially evenly around the circumference of the air transport channel. Optionally, the ionizers can also be arranged distributed in the longitudinal direction of the device (that is, the direction in which the air is transported through the device). A combination of lengthwise and circumferential distribution is also possible.
According to a further aspect, the invention relates to a method for cleaning air contaminated with solid particles, comprising passing the air to be cleaned through an air transport channel through a supply opening of the air transport channel and removing the device through an air vent opening from the device air supplied, and passing the air to be purified past an ionizer placed in the air transport channel to ionize the air flow and particles contained therein and cause agglomeration of ionized solid particles. This method is characterized in that the method comprises a filter located at a position between the ionizer and up to the outlet opening with a pore size that is larger than the size of at least a part of solid particles present in the supplied air, removing agglomerated particles from the air with the filter.
The method according to the invention comprises, according to a preferred embodiment, the use of a device according to the invention, for example as described in particular in one or more of the following numbered clauses: 1. Device for cleaning solid-particle air, comprising a air transport channel with a supply opening for supplying ambient air into the air transport channel and an outlet opening for removing air fed through the air transport channel from the device, as well as an ionizer placed in the air transport channel for ionizing the air flow and particles present therein, in that the device comprises a filter at a position located between the ionizer and up to the outlet opening side with a pore size that is larger than the size of at least a part of solid particles present in the supplied air. Device according to clause 1, wherein the filter has a pore size that is greater than at least 80% of the solid particles present in the supplied air. Device according to clause 1, wherein the flow-through area of the device near the ionizer is smaller than the flow-through area of the device near the filter. Device according to clause 1, wherein the air transport channel has a substantially rectangular flow-through surface over at least a part of its length. Device as claimed in clause 1, wherein the device comprises a fan provided in the air transport channel for passing air to be cleaned through the device. Device as claimed in clause 1, wherein the air transport channel has a substantially circular flow-through surface at the location of the fan. Device according to clause 1, wherein the filter is grounded. The device of clause 1, wherein the filter comprises a carbon-containing material. 9. Device as claimed in any of the foregoing clauses, wherein the filter comprises at least two layers of filter material which are enclosed in a housing, such that the layers of filter material are successively passed through the air to be cleaned. Device according to clause 9, wherein the layers of filter material are separated from each other by means of the housing, which housing is preferably made of a non-woven or woven material. 11. Device as claimed in any of the foregoing clauses, wherein at least two ionizers are provided in the air transport channel. 12. Device as claimed in clause 11, wherein the ionizers are provided substantially evenly around the circumference of the air transport channel.
The advantages of the device described above are thus obtained in the method in a corresponding manner.
In order to obtain at least one of the aforementioned advantages, the invention provides, according to an embodiment, a device comprising the following measures: device for cleaning solid-contaminated air, comprising an air transport channel with a supply opening for supplying ambient air into the air transport channel and an outlet opening for removing air fed through the air transport channel from the device, as well as one or more ionizers placed in the air transport channel for ionizing the air flow and particles present therein, the device being situated at a position between the ionizer (s) and the outlet opening comprises a filter for removing at least a part of the solid particles present in the supplied air with a pore size that is larger than the size of at least a part of the solid particles present in the supplied air and to be removed therefrom particles and w where the flow-through area of the device near and / or at the location of the ionizer (s) is smaller than the flow-through area of the device near and / or at the location of the filter on the upstream side thereof.
In this disclosure, the terms "upstream" and "downstream" refer to the air flow through the device, in particular through its air transport channel.
A controlled air flow is provided through the transport channel. Part of the particles to be filtered are electrically charged by the ionizer so that they are induced to agglomerate. The agglomerated particles are captured by the filter and removed from the air stream. The relatively large pores slow clogging of the filter and extend its useful life. By increasing the through-flow area of the device, pressure of the through-flow air is reduced and turbulence is promoted which induces entrained, and at least partially, charged particles to agglomerate. The enlargement of the through-flow surface and the resulting increase in the through-flow volume also facilitate occurrence and / or persistence of speed differences between the particles, which favors further agglomeration. The device promotes agglomeration of small particles in an efficient manner so that the small particles thus agglomerated can be efficiently filtered out by a relatively coarse filter. The device makes it possible to effectively remove fine dust particles and smaller particles including ultra-fine dust particles from the air stream.
In one embodiment, the filter is a first filter and the device comprises a second filter located at a position between the first filter and the outlet opening. Thus, particles can still be captured that pass through the first filter. The second filter can have a pore size that is larger than the pore size of the first filter, whereby the air flow after passing through the first filter behind the first filter is not strongly influenced.
In one embodiment the device comprises a fan provided in the air transport channel for passing air to be cleaned through the device. An air flow thus forced facilitates control of the air flow and makes the air flow (at least for the most part) independent of external influences. By means of the fan, particles of different sizes and / or different masses can also be effectively accelerated and, furthermore, turbulence in the air flow can be provided. The fan can be placed upstream of the filter and / or upstream of at least a part of the one or more ionizers. A fan or other blower thus placed essentially causes a propulsion flow instead of a suction flow which can lead to increased turbulence and particle diffusion in the airflow channel relative to a suction flow, in particular downstream of objects in the airflow.
In one embodiment the air transport channel has a substantially rectangular flow-through surface over at least a part of its length. This makes the device easy to manufacture and operate with rectangular materials, for example rectangular filter materials.
In one embodiment, at least the air transport channel is rotatably placed on a chassis. This makes (re) orienting the air transport channel possible.
In one embodiment, the (first) filter and / or, if applicable, the second filter is grounded or, respectively, electrically charged, for which it may be electrically conductive. This facilitates agglomeration of particles, in particular charged particles, and increases the chance of attracting and capturing charged particles.
In one embodiment, the first filter and / or, if present, the second filter comprises a carbon material, in particular active carbon. Carbon, in particular active carbon, has a high physical filtering capacity through adsorption and / or absorption and it can have a high chemical reactivity. It is therefore extremely suitable for the current application. Furthermore, such carbon materials are easily electrically conductive, which simplifies combining with an ionization step.
In one embodiment, at least the (first) filter comprises at least one layer of carbon material surrounded by the filter material and / or wherein the carbon material is provided as a layer between layers of filter material. This protects (active) carbon materials from external influences, including wear. The pollution of the environment can also be prevented by the release of carbon material.
In one embodiment the (first) filter comprises at least two layers of filter material which are fixed relative to each other, such that in operation of the device the layers of filter material are successively passed through the air to be cleaned. Suitable filter materials are cotton cloth and glass fiber cloth, but other materials are also possible. Thus, improved filter performance can be achieved by a greater chance of trapping particles passing through the filter. Any carbon material present may be provided between the layers of filter material, as described above.
The carbon material may be provided as granular or powdered material with an average particle size of about 100 microns or less with a standard standard deviation of particle sizes of 5-15%, e.g. 10%, it may also be more, e.g. 20%, but preferably in in any case such that the carbon material remains in the filter material during normal use of the device.
The (first) filter is preferably made of a non-woven material and / or a woven material. This combines a large effective surface with advantageous properties for processing and use, for example, pliability, transmissibility for air and mechanical strength, and generally low manufacturing costs.
The (first) filter can be made of a filter material of F9 quality (see for example the standard EN779: 2012). A finer filter quality, aimed at the enhanced filtering of ultra small particles, can be used which could lead to accelerated clogging of the filter material. It is expected that in a widening device as generally described herein with an F9 filter or finer filter that a carbon material material and / or as an electrically conductive filter as described elsewhere herein is useful in itself for achieving a positive and useful filter result, for example also without ionization or with a high effective degree of ionization of the particles present in the air stream.
At least the (first) filter can be designed as a bag filter, for example with a number of filter bags placed next to each other in a common container, wherein the bags can be substantially round or rectangular and are closed on three peripheral sides so that a cavity surrounded by the filter material becomes provided with a supply port on one side which, in use, points in the direction of the incoming air flow, and whereby leaks along and between adjacent bags are prevented, for example, by connecting adjacent parts of adjacent filter bags such as by stitching, gluing, welding, clamping together, etc. Pocket filters unite a relatively large active filter surface with a relatively small installation dimension (for example expressed as surface transverse to an air supply flow). With a built-in dimension which is substantially equal to the flow-through surface upstream near the filter, a relatively large effective filter surface is thus made possible, with respect to substantially flat, curved and / or pleated filters.
The filter is preferably shaped and positioned such that the air flow near or at the location of the filter substantially shaves onto the filter material. The filter material can therefore be oriented mainly at a smaller angle than 30 degrees with respect to the air flow near and / or at the location of the filter, preferably an angle of less than 15 degrees and more preferably an angle of less than 10 degrees such as for example an angle of between approx. 3 and 10 degrees. Due to a shearing incidence of the air flow, the air cannot flow through the filter, or hardly so at all, but because of their size, mass and / or inertia, the particles will have a higher chance of touching the filter material and thereby being trapped. The filter effectiveness therefore appears to increase to an unexpected extent, particularly for ultrafine particles. For such an embodiment, preferably more than 50% of the active filter surface, in particular more than 75% thereof, such as for example 80% -90% thereof, or an even higher part, is formed and positioned for such a shearing incidence. Such an embodiment can be effectively realized when the filter is formed as a conical filter and / or a bag filter, in particular a relatively narrow and deep bag filter in relation to its opening and / or built-in dimension (for example expressed as surface transverse to the air supply flow). .
In one embodiment, the second filter comprises a carrier and a carbon material, in particular active carbon, which is applied as a layer to or in the carrier, wherein "in the carrier" can be realized by a multi-layered structure of the filter wherein the carbon material if a layer is provided between carrier layers. The carrier can be a mat of woven and / or non-woven material. A foam as a carrier is also possible. The carrier and / or the layer of carbon material, for example active carbon, can be electrically conductive and / or chemically reactive.
In one embodiment, at least two ionizers are provided in the air transport channel, wherein the ionizers can be provided substantially evenly around the circumference of the air transport channel. This increases the effect of ionization. A uniform distribution promotes a large and substantially homogeneous spatial distribution of ionization charge and charged particles.
The device described herein may be adapted to provide a low effective degree of ionization of the particles present in the air stream.
In one embodiment, the device, in particular the ionizer, or, where applicable, the ionizers, are adapted to ionize only a part of the particles present in the air stream, in particular less than about 30% thereof, for example 2 0.25 '. thereof.
In particular, the ionizer / ionizers have an effective ionization range that is / are arranged such that only a part, in particular between approximately 20 and 40%, for example between approximately 25% -30%, of the through-flowed surface at the area of the ionizer (s) is effectively achieved for ionizing the particles.
Thus, only a portion of the particles will be ionized. The device can also be arranged and / or alternatively, in particular the one or more ionizers are arranged for ionizing a part of the particles present in the air stream with mutually opposite polarities such that the number of ionized particles of the one polarity and / or the total ionization charge of the one polarity transferred to the particles is an excess of more than about 20% of the number of particles of the other polarity and / or, respectively, of the total charge of the other polarity transferred to the particles, for example in an excess of 25% to 30% thereof. Thus, the ionizer, or, where applicable, the ionizers, are adapted to ionize a first part of the particles present in the air stream with a first polarity (positive or negative) and a second part of the particles present in the air stream with opposite polarity (negative or positive) and such that the number of particles of the first polarity and / or the total charge of the first polarity transferred to the particles is more than about 20% of the number and / or the charge of the second polarity, for example 25% -30% thereof. Through electrostatic interaction, oppositely charged particles will bond to each other to form neutral agglomerates that can further agglomerate with the excess polarized charged particles to the first polarity that can be filtered better, with little to no adverse effects of relatively high concentrations of similarly charged particles as described above.
By providing a low effective degree of ionization of the particles present in the air stream, for example by partial neutralization through agglomeration of oppositely charged particles and / or by providing only partial ionization, (further) agglomeration of particles is facilitated by mutual electrostatic repulsion of similar (positively or negatively) charged particles is limited with respect to air in which a relatively large amount of the particles present is ionized, in particular ionized with the same polarity. The present device can therefore be operative through a combination of uncharged interaction (e.g. Van der Waals forces) and electrostatic interaction. Ionization can also initiate or maintain favorable chemical processes. The result of a low effective ionization was unknown, but appears to be particularly advantageous for agglomerating and capturing ultrafine particles. An additional advantage is that a low effective ionization rate, in particular through ionization of a small part of the particles, reduces the risk of ozone and other harmful products. Ozone formation is further reduced by (operating the ionizers for) positive ionization compared to negative ionization.
In one embodiment, one or more components are provided in the device for promoting turbulence in the air stream, which may promote agglomeration of small particles into larger particles. One or more ionizers can also be placed in the air stream in advance for this purpose.
In order to obtain a sufficient degree of ionization at a high air flow rate, an elongated ionizer may be provided and / or different ionizers may be placed one behind the other in the flow direction.
A degree of ionization can be determined by determining one or more operating parameters of one or more ionizers, for example a time and / or location dependent charge loss and / or current intensity thereof. These one or more operating parameters can be related to flow parameters of the air fed through the air transport channel, for example a flow rate, a degree of humidity, a temperature, a particle amount and the like. One or more flow parameters can be influenced by suitably provided air treatment components, in particular an air humidifier and / or the fan. A control unit may be provided to control operating parameters of one or more ionizer (s) and one or more air treatment components in coordination with one another, possibly provided with a feedback system which may or may not be automated.
In one embodiment, the device is provided with one or more air guides near the outlet opening, whereby the flow-through surface of the device is enlarged between the filter and the outlet opening and / or, where appropriate, between the second filter and the outlet opening. As a result, an additional pressure drop can be created behind the relevant filter, which can improve flow through the filter.
In one embodiment, means are provided for forming and / or generating an additional air flow near the supply opening and / or the outlet opening on and / or along the outside of the device, for example one or more fans, one or more spoilers and the like, which can influence an air flow in or out of the air transport channel in a desired manner, for example, generating suction or causing impulsion.
In one embodiment, the air transport channel between the ionizer and the filter is provided with a widening and narrowing, such that the air transport channel in the air flow direction successively provides an enlargement and a reduction of the flow-through surface and wherein the flow-through surface of the device at or near the filter on the upstream side thereof is larger than the through-flowed area after the narrowing.
Thus, additional zones of deceleration and, respectively, acceleration, or pressure increase and, respectively, pressure reduction, are provided which can lead to increased relative velocity differences and interaction possibilities between the particles, and thus increased agglomeration of particles, prior to the flow-through increase described elsewhere herein surface and the interaction zone near and / or at the location of the filter.
The device may comprise a baffle placed in the air transport channel, wherein more than one baffle may also be provided. The baffle can be provided with a filter material, in particular a screen filter which can be displaceable over the baffle and for which displacement a drive can be provided. Due to the displacement, part of the filter can be replaced and / or "refreshed". The baffle can be at a non-perpendicular angle, in particular a small angle with the air flow direction in the air transport channel, for example less than 45 degrees, such as in a range of 20-30 degrees. The baffle can be substantially flat or have an at least partially curved shape, for example be provided with an aerodynamic shape (wing, vane, etc.) for guiding, controlling and / or otherwise influencing the air flow in a desired direction. The position and / or the angle of the baffle with the air flow direction in the air transport channel can be reversibly adjustable for which setting a drive can be provided.
By such a baffle part of the air flow can be influenced differently with respect to the basic shape of the flow channel, for instance for locally increasing and / or reducing pressure and / or increasing turbulence; a Venturi effect and / or a Coanda effect may also be generated in a part of the device for applying and / or reinforcing a desired flow profile.
The baffle can be provided as a liquid carrier and / or a liquid conductor and the device can be provided with a liquid supply and / or liquid discharge coupled or to be coupled thereto. Thus particles can be trapped in liquid and / or a vapor can be provided for that purpose in a part of the device. The baffle can be profiled and / or can be provided with one or more protruding parts such as ribs, studs and / or mesh. A desired liquid (flow) distribution over the baffle can thus be achieved. The protruding parts and / or the mesh can be arranged for supporting a filter material on the profile parts and / or protruding parts such that gaps are formed between the baffle and the filter for liquid that can be such that contact between the filter and the liquid is prevented. Thus, a humidified filter, in particular a screen filter, can be used which has an increased particle capture capacity and the filter can also at least partially influence and limit evaporation of the liquid from the space below. The liquid can be used for rinsing at least a part of the filter and / or for catching particles and discharging them. The filter can be relatively coarse, for example with a pore size in a range of 200-2000 micrometres, preferably between 300 and 1000 micrometres such as between 500 and 800 micrometres. Relatively coarse particles can be trapped by the filter, smaller particles can pass through the filter and be trapped by the liquid, and fine dust and ultra-fine dust can be agglomerated and / or trapped by any vapor in the gap, and / or they can be trapped by the filter further flows into the device to be filtered out afterwards.
The device can comprise a number of baffles placed in the air transport channel, a first baffle being at a first angle with the flow direction and a second baffle being at a second angle with the flow direction, such that at least a part of the air flow through the first baffle the second baffle is directed, and wherein at least a portion of the directed air flow is directed through the second baffle around the first baffle. The baffle plates preferably overlap each other, viewed in the main direction of the air flow through the device. The second baffle is in particular provided as a liquid carrier and / or a liquid conductor as indicated above. Thus, by controlling the air flow, a part of the particles entrained therein, in particular relatively large and heavy particles, can be captured by and / or on the second baffle, in particular on / in a baffle provided on the second baffle (e) filter and / or liquid.
One or more baffles can be placed in or near the above-described widening and / or narrowing in the air transport channel, whereby influencing of a flow profile and / or an installation space can be used effectively. More and / or differently designed baffles can be provided.
Hereby is further provided a filter for a device as described herein, comprising a multi-layer filter material of F9 quality or a finer filter quality, wherein the filter material is provided with a carbon material, in particular active carbon, wherein the carbon material can be provided as a powder are between layers of the filter material, the filter being essentially a cloth material, in particular a non-woven and / or woven material. The carbon may be provided with an average particle size of about 100 microns or less with a standard deviation of 5-15%, e.g. 10%, although that may also be more, e.g. 20%, but in any case such that the carbon material remains in the filter material.
The filter can be designed as a bag filter with the walls of the bag or bags containing the one or more layers of filter material. In particular, the filter may comprise F9 filter cloth.
Furthermore, in connection with the foregoing, a method for cleaning air contaminated with solid particles is hereby provided, comprising passing the air to be cleaned through an air transport channel of a device through a supply opening of the air transport channel and discharging it through an output opening. device removing the air fed through the air transport channel, and passing the air to be cleaned past an ionizer placed in the air transport channel to ionize the air flow and particles present therein and agglomerating ionized solid particles, the flowed surface of the device near the ionizer is smaller than the flow-through surface of the device near the filter upstream thereof, characterized in that the method comprises filtering with a filter located at a position between the ionizer and the outlet opening where the filter has a pore size that is larger then the size of at least a portion of solid particles present in the supplied air, and removing agglomerated particles from the air with the filter. The method may include application of a device as described herein.
With the device and / or method as set forth herein, particulate matter particles (particle size 10-2.5 micrometers) and ultrafine particles (particle sizes up to 100 nanometers) and particles of intermediate orders of magnitude (compare: Most Penetrating Partial Size "MPPS" in HEPA flashes) ) are filtered out with greeting efficiency and with a long service life of the filters.
It should be noted that filters of F9 quality and / or a finer quality have until now only been used for filtering - preferably pre-treated - indoor air. However, it appears that such material can also be suitably used in the outside air, and for cleaning thereof, and in combination with large flow volumes, especially when the flow surface of the filter material is increased by providing the filter material in bag filter form. It also appears that filters of F9 quality and / or a finer quality can be suitably provided with an (active) carbon layer and that an increased filter effect for MPPS and ultrafine particles can thereby be achieved. Surprisingly, it appears that in particular F9 material with a carbon powder layer of a few tens to a few hundred micrometers in thickness (for example 0.2 millimeters thick) in combination with high flow rates in spite of conventional insights is sufficient to filter the air flowing through the filter of MPPS and ultrafine particles. The interaction time of a few minutes deemed necessary to date for adsorption of particulate matter and smaller particles with active carbon appears to be unnecessarily long when using the device as described herein.
The invention will be explained in more detail below with reference to the drawings. The drawings show in:
FIG. 1 a schematic section through a device according to the invention;
FIG. 2 is a schematic section through another device according to the invention;
FIG. 3 is a partial schematic section through the device according to FIG. 2, as indicated therein with the line III-III;
FIG. 4 a further embodiment of the device;
FIG. 5 is a schematic section through another device according to the invention.
In the figures, the same parts are indicated by the same reference numerals. However, the parts necessary for a practical implementation of the invention are not all shown, due to the simplicity of the representation.
FIG. 1 shows a schematic section through a device 1 according to the invention. The device 1 essentially comprises an envelope 2 which defines an air transport channel 3. The air transport channel 3 has a substantially elongated shape which extends from a supply opening 4 for supplying ambient air into the air transport channel. The air transport channel 3 extends to an outlet opening 5 for removing air fed through the air transport channel 3 from the device 1. The device 1 further comprises an ionizer 6 placed in the air transport channel 3 for ionizing the air flow and particles present therein.
Effective transport of the air to be cleaned is obtained by a fan 7 which, in the embodiment shown, is located between the supply opening 4 and the ionizer 6. The ionizer ensures a static, electrical charge of particles present in the air stream. If only a few particles are statically charged, other particles will be attracted to the electrical charge and therefore form statically charged particle agglomerates. Such agglomerates have a larger size than the particles individually.
The particles, in particular the agglomerates, are collected in a filter 8.
The device 1 comprises a first part F which defines a first flow-through surface of the air transport channel 3 and a flared second part S which forms a widening whereby the flow-through surface of the air transport channel 3 of the device 1 increases to the filter 8 which substantially the air transport channel close.
The agglomerates can be trapped easily with a filter material that has significantly larger pores than the size of the individual, non-agglomerated particles. This furthermore has the effect that the filter 8 will have a considerably lower resistance than a filter that is designed to capture the said small particles and therefore will have much smaller pores.
The device 1 is placed on a mounting table 9 in order to be able to place the device 1 on any desired surface. For example, the device can be placed on a building to clean ambient air. The device can also be placed in a living room or the like to clean the air. In both cases an effect is obtained that the air in the wide environment of the device is also stripped of solid particles. According to the physical principle of distribution of substances in a medium, such as solid particles in the air, their distribution will settle as much as possible. This means that the concentration of solid particles will be quickly compensated when the particles are removed from the air at a single position, such as near the device 1 according to the present invention. Particles from the surrounding air will migrate towards the device 1 so that the cleaning of the air is also noticeable at a great distance from the device 1 according to the invention.
The filter 8 can comprise a rectangular shaped filter material, through which the filter material can cover a rectangular shaped outlet opening 5 of the device 1. The filter material can be included in a cotton or linen cover to hold the filter material together. The cover or the like is preferably of a light color, so that it can easily be determined visually that contamination has taken place and the filter must be replaced.
A pressure sensor can also be provided in the device 1 on the inflow side 10 and the outflow side 11 of the filter 8, so that the pressure difference can be used as a measure of the contamination of the filter 8. A higher pressure difference will indicate a greater contamination than a lower pressure difference. A measurement relative to an ambient air pressure and / or another reference value such as a measured value after a service and / or under certain controlled operating conditions can also be used. In particular for such cases (use of) a single sensor in the device is sufficient.
The filter preferably comprises an electrically conductive material that is substantially processed throughout the filter to optimize the capture of the ionized particles. For example, the filter material may comprise carbon, in particular active carbon, and the filter may be grounded. Earthing will cause the filter to charge to the ionized particles in the opposite direction and effectively capture and bind them. Instead of a grounded filter, an electrically charged filter can also be used in which the electrical charge is opposite to the ionized charge of the particles.
The device can be controlled wireless or wired to check the condition. If a wireless system is used, this can be done via WiFi, mobile phone, Zigbee or any other wireless system.
To facilitate access to the device 1, for example, a part 13 of the device can be pivotally pivoted away from a main part 12 of the device 1 near the fan. The main part 12 of the device 1 can be fixedly connected to the mounting table 9, while the fan 7 is provided on the part 13 to be pivoted away. At the other end of the device 1, a filter part 14 can be hingedly connected to the main part 12, so that the filter 8 can easily be replaced. By hinging the part 12 or 13 away from the main part 12, access is also granted to the ionizers, for example for maintenance or replacement thereof.
The device can easily be designed for treatment of 15,000 cubic meters of air per hour, through an air transport channel with a diameter of 80 cm and an outlet opening (filter surface) of 0.80 meters by 1.4 meters.
The air passes through the air transport duct at 8 m / s, and through the filter at around 4.5 m / s. By increasing the filter surface (1.40 m by 2.4 m) and increasing the diameter of the air transport channel to approximately 1.4 meters, the capacity can be increased to 60,000 cubic meters per hour (the air goes with 30 km / u through the filter). These values are indications and are not a limitation.
A self-supporting embodiment of the device 1 is possibly obtained when it comprises solar panels. The solar panels can arrange for the fan and the communication equipment to communicate the condition of the device.
A rain sensor can be advantageously connected to the device 1 when it is arranged in the outside air to clean the ambient air. In rainy conditions the air pollution is very low, because it is flushed out with the rain. Operation of the device is then not necessary. Furthermore, a delay can be provided for, after a period of rain, to prevent the device from coming into operation for, for example, an hour or any other desired period of time.
A particle meter can measure the concentration of contamination to determine whether or not the device 1 is to be put into operation. The particle meter can be placed in the immediate vicinity of the device 1 or at a greater distance, since the effectiveness can be measured at a great distance. For example, the distance can vary from approximately 0 meters to 500 meters, or even to 1 kilometer.
FIG. 2 shows another embodiment which is very similar to that of FIG. 1, so that only deviations are emphasized here. An optional grid 16 is provided at the supply opening 4 in order to prevent disturbances of the device due to coarse dirt, objects and / or animals that could otherwise be entrained by the air flow through the device (see arrow W). The ionizer 6 projects into the air transport channel 3 in advance.
The device 1 is rotatably mounted on the mounting table 9, or another chassis (not shown) about a vertical axis A, for example with the aid of one or more bearings. Alternatively or additionally, in one embodiment, the device 1 can be rotatably arranged about a horizontal axis transversely of the longitudinal axis, and / or the device 1 can be arranged translatably, in particular height-adjustable. Optionally, the device 1 is provided with one or more drives (not shown) so as to set a position and / or orientation, which drives can be operated and / or controlled wirelessly or wired. The drives can be arranged to also allow non-driven changes of position and / or orientation of the device, e.g. with an unlocking device and / or a freewheel device. An optional control surface 17 can help rotate the device so that the feed opening 4 faces the wind direction.
The embodiment shown has, in the air flow direction, a first filter 18 and a second filter 19. The first filter 18 is, for example, a bag filter, comprising, as is usual for a bag filter, a series of juxtaposed bags 18A (Fig. 3; only a few shown), for example 5 or 10 bags, which together form the filter with a proportionally increased effective filter surface. In this case, however, the bags 18A mainly consist of a carbon material 21 arranged between two layers of F9 filter cloth 22. Other filter materials that have a higher filtering effect for MPPS particles and / or ultrafine particles can also be used. It is further possible to provide a first, possibly relatively coarser, filter material in such a filter on an upstream side of the filter and to provide another, possibly relatively finer filter material on a downstream side, and / or to have two different layers of filter cloth, to provide. Different layers of carbon material or other filter material can also be provided in such bag flashers. A series of consecutive pocket flashers and possibly other types of fine filters (for example HEPA or ULPA flashes) is possible, but seems unnecessary. The filter materials can be made with one or more electrically conductive materials and / or the carbon layer can be electrically conductive. Conductive elements may also be provided at the front and / or back of the filter to allow a desired charge and / or a desired potential difference with the ionizers to be applied and / or to drain absorbed static charge through entrapped charged particles.
The second filter 19 is placed downstream of the first filter 18, near the outlet opening 5. The second filter 19 comprises (not shown) a carrier provided with an active carbon layer, for example an active carbon-coated PE foam (PE = polyethylene) . The pore size of the second filter 19 is preferably larger than that of the first filter 18, but it may also be smaller or equal to it.
Behind the second filter 19, viewed in the direction W of the air flow, an optional third filter 20 or a grid is provided which provides protection for the first and second filters 18, 19. With a lightly colored second or third filter 19, 20 of sufficiently small pore size, a discolouration on the second or third resp. third filter 19, 20, indicate aging of filter material.
The first filter 18 can be electrically grounded or charged. Grounding can prevent a charge from building up on the filter 18 that is similar (negative / positive) to the one supplied to the particles by the ionizer 6. The second filter 19 can be electrically grounded or charged, for example opposite (positive / negative) with respect to the ionizer 6 (negative / positive). As a result, between the first and second filters 18, 19, an electric field can be applied which can help agglomerate and / or attract charged particles to one of the two filters 18, 19.
In an embodiment (not shown) a chemical filter is provided on or near the supply opening 4 of the device 1 for capturing and / or rendering harmless aggressive chemicals, for example sulfur-containing substances. As a result, the device 1, and in particular the first and / or second filters 18, 19, is affected less rapidly by those substances.
An optional module 23 is connected to one or more optional sensors of the device for detecting and possibly processing signals therefrom, such as, for example, signals from the fan 7, the ionizer 6, a pressure sensor 24, a rain sensor 25, an air flow sensor and further sensors (not shown). The module 23 can be connected (wirelessly or otherwise) to an optional external control module 26 which can be in the form of an application on a more widely usable user module, for example a mobile telephone.
On the outflow side 11, the device is provided with optional air guides 27, each having an entrance opening 28 with a first through-flow surface and an exit opening 5A with a second through-flow surface that is larger than the first through-flow surface, thereby increasing the through-flow surface of the device between the second filter 19 and individual partial outlet openings 5A which together form the entire outlet opening 5.
An air flow through the device 1 from the inlet opening 4 to the outlet opening 5 successively undergoes (i) an acceleration and pressure difference through the fan 7, (ii) ionization of particles present in the air flow through the ionizer 6, (iii) a delay through the enlargement of inner dimensions of the air transport channel, that is to say the flowed-through surface, whereby the delay according to current insights of the applicant has an uneven effect on the particles and results in speed differences between particles, Then (iv) a pressure increase (just) before the first filter 18 mechanical and electrical effects of the first filter 18. By one or more of the aforementioned effects, small particles are stimulated to agglomerate so that thereafter (v) in the first filter 18 a high proportion of the particles present in the air are captured. Subsequently (vi) a new pressure drop is created behind the first filter 18, and (vii) a new (local) pressure build-up is created by the presence of the second filter and (viii) a possible charge difference between the first and second filter 18, 19, as a result of which non-trapped particles are strengthened after all to be agglomerated so that they can thus be trapped in the second filter 19.
The current conviction of the applicants that agglomeration of particles can be achieved so successfully through the alternating pressures and potentials that particulate particles (particle size <10 micrometer) up to ultra-fine particle particles (particle size <0.1 micrometer) with particularly high effectiveness can also be achieved with relatively coarse filters an air stream can be removed, up to almost 100% for some particle sizes.
FIG. 4 shows an embodiment 100 that is highly similar to that of FIGs. 2-3, and further provided with a widening D and a narrowing C, such that the air transport channel 3 in the air flow direction W is successively provided with an enlargement and a reduction of the through-flow surface. The dilation D thus functions as a diffuser and the restriction C as a compressor. Due to the widening S downstream of the narrowing C, a waist T is created and the flowed-on area of the device at or near the filter 8 on the upstream side thereof is clearly larger than the flowed-through area in the waist T after the narrowing C. The dimensions of the flow-through surface of the air transport channel 3 upstream and downstream of the widening D and the narrowing C may be uneven. The dilations D and S can lead to an increase in the flow-through area of 10% -50% or more; a magnification between 50% -75% can be preferred. The dilations D and S can also lead to different dimensions.
FIG. 5 shows an embodiment 110 similar to FIG. 4. In this embodiment, various ionizers 6 are visible, both in the first part F and at the waist T, and arranged such that they also promote turbulence in addition to ionization of particles. Furthermore, a first baffle plate 30 and a second baffle plate 32 are placed in the air transport channel 3. The first baffle plate 30 is at a first angle α with the flow direction W, the second baffle plate 32 is at a second angle β with the flow direction W, both about 45 degrees or less; the angles α and β are reversibly adjustable, for example by means of hinges 34. Through the first baffle plate 30, an air flow is led from the first part F to the second baffle plate 32, after which the air passes through a gap between the two baffle plates 30, 32, and flows around an end of the first baffle 30, guided by the second baffle 32. The baffles 30, 32 can be placed at a distance from inner walls of and / or parts in the air transport channel 3 so that gaps are provided through which the air can flow. The baffles 30, 32 can thus cause increased pressure differences and / or turbulence in the air flow.
The second baffle plate 34 is provided with a filter material 36, in particular a cloth filter, a supply of which may be present, for example on rollers 38. The baffle plate 34 is provided with ribs, here mainly in the plane of FIG. 5, whereby the filter cloth 36 is carried and gaps for liquid transport are provided. A part of the filter material can be displaceable over the baffle 34, for example by rotation of the rollers 38 in order to be able to replace (parts of) the filter, for example in connection with contamination and / or wear. An adjustable drive may be provided for such displacement (not shown). The baffle 34 is provided as a liquid carrier and a liquid guide and the device 110 is provided with an optional liquid supply 40 and liquid discharge 42 which are connected with one or more lines to respective optional reservoirs 44, 46 and here also with an optional pump and / or washing installation 48 for pumping and / or cleaning or otherwise conditioning one or more used and / or used fluids. The liquid can be used, for example, to moisten and / or rinse the filter 36, whereby liquid running through the filter 36 can be discharged through the baffle 34 and the drain 42, possibly for cleaning and / or reuse. The liquid preferably has a high vapor pressure so that it does not evaporate quickly at (expected) operating temperatures and is preferably toxic to the environment and biodegradable. Glycol solutions are considered suitable. The material of the filter 36 is preferably machine washable.
The filter 36 preferably has a coarser pore size than the filters located further downstream. Through this filter, coarse impurities, for example sand, pollen and the like, can be effectively removed from the air stream.
In FIG. 5, bag filters 18A are further indicated, the filter material 18B of which is oriented mainly at angle γ of about 5 degrees with respect to the airflow direction W (the opening angle δ = 2γ of the filters shown is about 10 degrees) whereby the airflow direction W near or at the location of the filter 18 substantially shaves onto the filter material 18A. The invention is not limited to the embodiments described above and shown in the figures. The invention is only limited by the appended claims. The device may, for example, contain more dilations and narrowings. The device can be used on land and / or on board ships.
The invention also extends to any combination of measures described above independently of and / or in other combinations of one another.

Claims (18)

  1. Device for cleaning air contaminated with solid particles, comprising an air transport channel with a supply opening for supplying ambient air into the air transport channel and an output opening for removing air fed through the air transport channel from the device, as well as one or more in the air transport channel ionizers for ionizing the air stream and particles contained therein, the device comprising a filter at a position located between the ionizer (s) and the outlet opening with a pore size that is larger than the size of at least a part of the feed airborne solid particles present and to be removed therefrom and in which the flow-through area of the device near and / or at the location of the ionizer (s) is smaller than the flow-through area of the device near and / or at the location of the filter on the upstream side thereof and wherein the device is arranged to have a low ef effective ionization degree of the particles present in the air stream.
  2. Device as claimed in claim 1, wherein for applying the low effective degree of ionization of the particles present in the air stream, the device is arranged, in particular the one or more ionizers are arranged for ionizing only a part of the particles present in the air stream, in particular less than about 30% thereof, for example 2 01-23V. thereof and / or wherein the device is arranged, in particular the one or more ionizers are arranged, for ionizing a part of the particles present in the air stream with mutually opposite polarities such that the number of ionized particles of the one polarity and / or whether the total ionization charge of the one polarity transferred to the particles is an excess of more than about 20% of the number of ionized particles of the other polarity and / or, respectively, an excess of more than about 20% of the total on the particle transferred charge of the other polarity, for example in an excess of 25% -30% thereof, wherein in particular the one or more ionizers can provide an effective ionization range which is arranged such that only a part, in particular between approximately 20% and 40%, for example between about 25% -30%, of the flow-through surface at the location of the ionizer (s) is effectively achieved before the ionizing the particles.
  3. 3. Device as claimed in any of the foregoing claims, wherein the device comprises an actuator provided in the air transport channel, for instance a fan, for passing air to be cleaned by the device through the device, wherein the fan upstream of the filter and / or upstream of at least a portion of the one or more ionizers.
  4. Device as claimed in any of the foregoing claims, wherein the filter is a first filter and the device at a position situated between the first filter and the outlet opening a second filter for removing at least a part of the air supplied in the supplied air solid particles, which in particular has a pore size that is larger than the pore size of the first filter.
  5. Device as claimed in any of the foregoing claims, wherein the filter, and / or the second filter, if present, comprises a carbon material, in particular active carbon, wherein preferably at least the filter comprises at least one layer of carbon material surrounded by the filter material and / or wherein the carbon material may be provided as a layer between layers of filter material.
  6. Device as claimed in any of the foregoing claims, wherein the filter is mainly made of a non-woven or woven material, and / or the filter comprises at least two layers of filter material which are fixed relative to each other, such that in operation of the device the layers of filter material are successively passed through the air to be cleaned, and / or in which the filter material is of F9 quality or a finer filter quality, and / or in which the filter is designed as a cloth filter or a bag filter, such that the air flow is near or on site of the filter substantially shaves onto the filter material, wherein for example the filter material is oriented substantially at a smaller angle than 30 degrees with respect to the air flow near and / or at the location of the filter, preferably an angle of less than 15 degrees and more preferably an angle of less than 10 degrees such as, for example, an angle of between approximately 3 and 10 degrees.
  7. Device as claimed in any of the foregoing claims, wherein the filter, and / or the second filter, if present, is electrically conductive and is earthed or electrically charged.
  8. 8. Device as claimed in any of the foregoing claims, wherein near the outlet opening the device is provided with one or more air conductors whereby the flow-through surface of the device is enlarged between the filter and the outlet opening and / or between the second filter if present and the outlet opening.
  9. Device as claimed in any of the foregoing claims, wherein the air transport channel between the ionizer and the filter is provided with a widening and narrowing such that the air transport channel in the air flow direction successively provides an enlargement and a reduction of the flow-through surface and wherein the flow-through surface of the device at or near the filter on the upstream side thereof is larger than the flow-through surface after the narrowing.
  10. Device as claimed in any of the foregoing claims, comprising a baffle placed in the air transport channel, wherein the baffle can be provided with a filter material, in particular a cloth filter which can be displaceable over the baffle and for which displacement a drive can be provided, and wherein the baffle can be at a non-perpendicular angle, in particular a small angle with the air flow direction in the air transport channel and / or wherein the position and / or the angle of the baffle with the air flow direction in the air transport channel is reversibly adjustable for which setting a drive may be provided.
  11. Device as claimed in claim 10, wherein the baffle can be provided as a liquid carrier and / or a liquid conductor and the device can thereby be provided with a liquid supply and / or a liquid discharge and wherein the baffle can be profiled and / or can be provided with a or more protruding parts such as ribs, studs and / or mesh, possibly arranged for supporting a filter material on the profile parts and / or protruding parts such that gaps are formed between the baffle and the filter for liquid that can be such that contact between the filter and the liquid is prevented.
  12. 12. Device as claimed in any of the claims 10-11, comprising a number of baffles placed in the air transport channel, wherein a first baffle is at a first angle with the flow direction and a second baffle is at a second angle with the flow direction, such that at least a part of the airflow through the first baffle is directed at the second baffle, and wherein at least a portion of the directed airflow through the second baffle is directed around the first baffle.
  13. Device as claimed in claim 9 and one of the claims 10-11, wherein the baffle is placed in or near the widening and the narrowing in the air transport channel
  14. Device as claimed in any of the foregoing claims, wherein at least the air transport channel is rotatably placed on a chassis.
  15. A filter for a device according to any one of the preceding claims, comprising a multi-layer filter material of F9 quality or a finer filter quality, wherein the filter material is provided with a carbon material, in particular active carbon, wherein the carbon material is preferably a layer is provided between layers of the filter material, in particular as a layer of granules or powder between layers of the filter material, wherein the filter can be essentially a cloth material, for example, of a non-woven and / or woven material.
  16. The filter of claim 15, wherein the filter is shaped as a bag filter with an access opening wherein the walls of the bag or bags contain the one or more layers of the filter material and the carbon material.
  17. 17. Method for cleaning solid-air contaminated air, comprising passing the air to be cleaned through an air transport channel of a device via a supply opening of the air transport channel and removing the air fed through the air transport channel from an apparatus via an outlet opening, and passing the air to be cleaned past an ionizer placed in the air transport channel to ionize particles present in the air stream and cause the ionized particles to agglomerate, the flow-through area of the device near the ionizer being smaller than the flow-through area of the device near the filter upstream thereof, characterized in that the method comprises filtering with a filter located at a position between the ionizer and the outlet opening wherein the filter has a pore size that is larger than the size of at least a part of the one in the solid particles present in the supplied air, and removing agglomerated particles from the air with the filter, the method comprising providing a low effective degree of ionization of the particles present in the air stream by ionizing only a part of the particles present in the air stream, in particular less then about 30% thereof, for example 20% -25% thereof and / or by ionizing particles with mutually opposite polarities such that the number of ionized particles of the one polarity and / or the total ionization charge of the one polarity transferred to the particles is an excess represents more than about 20% of the number of particles of the other polarity and / or, respectively, of the total charge of the other polarity transferred to the particles, for example in an excess of 25% -30% thereof.
  18. A method according to claim 17, comprising the use of a device according to any one of claims 1-15.
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