Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/02—Plant or installations having external electricity supply
  • B03C3/04—Plant or installations having external electricity supply dry type
  • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/019—Post-treatment of gases
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
  • B03C3/34—Constructional details or accessories or operation thereof
  • B03C3/38—Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
  • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
  • F24F8/192—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by electrical means, e.g. by applying electrostatic fields or high voltages
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
  • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
  • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
  • Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

Definitions

• the invention relates to an apparatus and a method for cleaning a contaminated with a group of particles gaseous medium.
• Air or exhaust gases are often contaminated with pollutants that may pose a health risk or affect well-being.
• pollutants are e.g. to small particles such as dust or cigarette smoke and organic particles such as spores, mites, bacteria, viruses or volatile organic compounds.
• Devices for cleaning a particle-contaminated gaseous medium (in particular air) which have a flow channel equipped with: a blower, an ionization region with an ionization device for ionizing the particles and an electrostatic precipitation device with a particle collection region for the electrostatic deposition of the ionized particles.
• the ionization device used in these devices generates very strong electric fields.
• the gaseous medium to be purified is air (or other oxygen-containing gases)
• the oxygen tends to combine to form triatomic ozone (O 3 ) in a strong electric field such as that produced by the ionization device.
• Ozone is an unpleasant one smelling gas, which in concentrations of> 200 ⁇ g / m 3 (> approx. 0.1 ppm) is harmful or toxic.
• the ozone is therefore an undesired by-product during the cleaning process, which should be removed to avoid health risks from the air or gas.
• barrier filters are also unable to remove organic particles such as spores, mites, bacteria, viruses, odors or volatile organic compounds from the gaseous medium.
• Either special barrier filter combinations are required for this purpose (eg an activated carbon filter in combination with a nanofilter), or additional systems such as Example radiation devices which irradiate the gaseous medium with ultraviolet light.
• Example radiation devices which irradiate the gaseous medium with ultraviolet light.
• the invention is therefore based on the object or the technical problem of providing a device and a method which makes it possible to use a gaseous medium (in particular air) which is contaminated with particles which are larger and smaller than 0.1 ⁇ m to cleanse these particles in a simple and effective way.
• a gaseous medium in particular air
• This device for cleaning a gaseous medium contaminated with a group of particles, in particular air, which group has particles larger and particles smaller than 0.1 ⁇ m, comprises a flow channel having: a) an ionization region with an ionization device for ionizing or charging the Particle; b) ozone generating means for generating ozone in the gaseous medium having an ozone generating capacity ranging from 200 ⁇ g / m 3 (about 0.1 ppm) to 1000 ⁇ g / m 3 (about 0 , 5 ppm), in particular 200 ⁇ g / m 3 to 950 ⁇ g / m 3 , in particular 200 ⁇ g / m 3 to 850 ⁇ g / m 3 ; c) an electrostatic precipitator having a particle collection region for electrostatically depositing ionized particles greater than 0.1 ⁇ m; d) a particle oxidation region for oxidizing ionized particles smaller than 0.1 ⁇ m by the
• the device according to the invention is preferably designed as a portable household air purification and / or air conditioning unit.
• the ionization device forms an electrostatic filter in conjunction with the electrostatic precipitator.
• the flow channel of the device can basically have one or more flow channel arms and also branch in its course.
• the ionization device preferably has a discharge electrode which is connected to a high voltage source and forms around it a charging zone for charging the particles located in the gaseous medium (corona effect).
• the discharge electrode may be in the form of one or more wires, or else in the form of an elongated element provided with needles, spines, serrations or other sharp or pointed edges or the like, or else in the form of a net or a grid.
• the electrostatic precipitator device expediently has at least two plate-shaped plates lying opposite each other at a distance Collector electrodes whose surfaces within the flow channel or as part of the same define the particle collection area.
• the arrangement and shape of the plate-shaped collector electrodes is adapted to the shape of the flow channel.
• the previously discussed electrostatic filter may be configured as a dry or wet filter.
• the ionization device is configured as the ozone generating device.
• a separate ozone generating device can in principle also be provided.
• the particle oxidation region forms or is disposed within the flow channel.
• the ionization region and the particle oxidation region may preferably partially or (substantially) completely overlap or merge.
• the ionization and oxidation of the particles then takes place in the same or approximately the same volume element of the medium flowing through the flow channel.
• the ionization region and / or the particle oxidation region may also overlap with the particle collection region.
• the ozone treatment portion forms part of the flow passage (preferably, an end portion thereof) and is disposed within the same.
• the ozone treatment region in which the ozone is subjected to a treatment
• these regions can nevertheless at least partially overlap slightly or merge into one another.
• the electrostatic filter serves as a first filter stage, specifically for the particles greater than 0.1 ⁇ m. Furthermore, in accordance with the inventive solution within the electrostatic filter, a large amount of ozone is produced in a targeted manner, resulting in a high ozone content (or much higher ozone content than usual) in the gaseous medium to be purified. By means of this ozone, the ionized particles, which are less than or equal to 0.1 microns and can hardly be captured by the electrostatic filter, oxidized in the particle oxidation region and thereby destroyed, decomposed or rendered harmless.
• the gaseous medium can also be cleaned of organic particles such as spores, mites, bacteria, viruses, odors or volatile organic compounds.
• the particle oxidation region thus acts as the second filter stage, specifically for the particles less than or equal to 0.1 ⁇ m. Since, as already mentioned above, the ionization region and the particle oxidation region (and possibly also the particle collection region) substantially or completely overlap in this configuration and form a common, uniform region of the flow channel, the first and second filter stages form in FIG in a sense a unity or a unified, integral functional component. This leads to an extremely compact design and a very low construction volume of the device and allows based on a predetermined length of the flow channel a very high cleaning performance.
• barrier filter In order to remove the particles smaller than or equal to 0.1 .mu.m from the medium, it is not absolutely necessary to use a barrier filter in the solution according to the invention. Rather, the "filtering" or rendering the particles less than or equal to 0.1 ⁇ m in the free passage cross-section of the flow channel can be done.This way, the flow resistance in the flow channel compared to conventional device is considerably reduced, which also has a positive effect on the noise emission of the device And if the device is equipped with a blower to direct the gaseous medium through the flow channel, then only a small blower power and consequently only a low energy consumption is required. Since barrier filtration is not mandatory for particles larger or smaller than 0.1 ⁇ m, there is no need to replace a barrier filter.
• the cleaning of the flow channel of the device according to the invention is extremely simple. If, for example, the plate-shaped collector electrodes of the electrostatic precipitator device ("first filter stage") are cleaned, the cleaning of the integral "second filter stage” inevitably takes place at the same time. This is very simple and effective.
• the ionization device is configured as the ozone generating device, and / or the ionization region and the particle oxidation region overlap partially or completely, this leads to a further positive technical synergy effect namely, ionization performance of the ionization device will not only improve the electrostatic deposition performance (first filter stage), but will also increase the production of ozone (which is usually undesirable in conventional devices but not in the invention) and thus the performance of the above mentioned improve second filter level.
• the very high ozone content generated within the flow channel must, of course, be reduced back to a permissible value before the gaseous medium purified by the particles leaves the flow channel and is conducted into the environment or ambient air. This is done in the ozone treatment area by means of the ozone reduction device.
• the ozone reduction device As an ozone-reducing device, various elements and means described in greater detail below can be used, which in turn can be streamlined integrated into the flow channel. This also contributes to the reduction of flow resistance, low energy consumption and noise reduction.
• the ozone-reducing device Since the ozone treatment area of the electrostatic precipitator and the particle oxidation region is connected downstream and thus only of such Volumes of the gaseous medium is flowed through, which are already cleaned of the particles, the ozone-reducing device will not clog with particles and is therefore extremely durable.
• the device according to the invention thus makes it possible to effectively and effectively clean a gaseous medium (in particular air) which is contaminated with particles which are both larger and smaller than 0.1 ⁇ m in a simple and effective manner.
• a gaseous medium in particular air
• the ozone reducing device has an ozone filter which has a catalytically active agent which promotes the conversion of ozone to oxygen.
• the catalytically active agent can be, for example, manganese oxide, titanium oxide, aluminum oxide, zirconium oxide, spinel or mullite. Spinel is defined as a mixture of magnesium and alumina. Mullite is defined as a mixture of aluminum and silicon oxide. A combination of these and any other suitable catalytic agents which promote the conversion of ozone to oxygen may also be used.
• the catalytically active agent can, for example, in the form of a paint, a coating, a plate-shaped or differently shaped element or the like flow-integrated into the flow channel.
• a further preferred embodiment of the device according to the invention provides that it has a fan for forcibly passing the gaseous medium through the flow channel.
• the blower can in principle be arranged at any suitable point of the flow channel. However, if the blower is a pressure blower, it is expedient to arrange this in an input region of the flow channel. With the help of the blower, the flow rate of the gaseous medium through the flow channel can be increased.
• the fan is a suction fan connected downstream of the electrostatic precipitator for forcibly sucking through the gaseous medium through the flow channel.
• At least part of the suction fan is designed as an ozone filter.
• the fan can partially take over the function of an ozone filter.
• the part of the suction fan designed as an ozone filter has a flow-associated surface which is associated with the gaseous medium and which is provided with the catalytically active agent. Due to this construction, a relatively large, catalytically effective surface can be provided, which comes into contact with the gaseous medium, which is moved by the suction fan. This makes it possible to improve the reduction of the ozone content in the air at the end portion of the flow channel.
• the suction fan has fan blades, and that the flow-bearing surface provided with the catalytically active agent is a surface of the fan blades.
• the flow-bearing surface provided with the catalytically active agent is a surface of the fan blades.
• one particularly large surface can be provided, which is providable with the catalytically active agent. This makes it possible to further improve the reduction of the ozone content in the gaseous medium at the end portion of the flow channel.
• At least a portion of a flow-bearing surface of the flow channel is formed as an ozone filter and provided with the catalytically active agent.
• the portion of the flow-containing inner surface of the flow channel provided with the catalytically active agent is preferably connected downstream of the ionization device (and its discharge electrode) and upstream of the suction blower.
• the portion of the flow-bearing inner surface of the flow channel provided with the catalytically active agent forms a jacket of the suction fan.
• This sub-area thus functions not only as a jacket of the suction fan, but at the same time as an ozone filter or part of an ozone filter and thus performs an advantageous dual function.
• the portion of the flow-bearing inner surface of the flow channel provided with the catalytically active agent is an outlet region of the flow channel. If the device has a suction fan, this output range may be downstream of the suction fan or at least partially a sheath form the suction fan. In this way, the ozone content of the emerging from the flow channel gaseous medium can be further reduced.
• an additional, advantageous embodiment of the device according to the invention provides that the ozone filter has a flow grid which can be integrated into the flow channel and whose surface is provided with the catalytically active agent.
• a flow grid which can be integrated into the flow channel and whose surface is provided with the catalytically active agent.
• the flow channel is provided with an ozone pre-filter, which is downstream of the ionization device (and its discharge electrode) in relation to the flow direction in the flow channel and upstream of the ozone filter.
• the pre-filter can basically be constructed the same or similar to the ozone filter described above.
• this device has a control device for controlling the amount of ozone to be generated by the ozone generating device.
• the control device here is preferably associated with a particle sensor which directly and / or indirectly detects the amount of particles contained in the gaseous medium less than or equal to 0.1 .mu.m and supplies a measurement signal to the control device.
• the control device controls and / or regulates the amount of ozone to be generated by the ozone generating device and thus the level of the ozone content. If the gaseous medium is only slightly loaded with particles less than or equal to 0.1 ⁇ m, it is thus possible to generate a low ozone content which is sufficient for the desired cleaning action. If, on the other hand, the medium has a high load of particles smaller than or equal to 0.1 .mu.m, a high ozone content can be generated and a high cleaning performance can be achieved. By means of the control device, the ozone production can therefore always be adapted to the respective particle load ratios (based on particles smaller than or equal to 0.1 ⁇ m). This also protects the ozone filter (or the ozone prefilter) and increases its service life.
• This method according to the invention for purifying a gaseous medium contaminated with a group of particles, in particular air, which group comprises particles larger and particles smaller than 0.1 ⁇ m comprises the following steps: a) ionizing and charging the particles; b) generating an ozone content or ozone content in the gaseous medium which is in a range from 200 ⁇ g / m 3 (about 0.1 ppm) to 1000 ⁇ g / m 3 (about 0.5 ppm); c) electrostatic precipitation of the ionized particles greater than 0.1 ⁇ m; d) oxidizing the ionized particles smaller than 0.1 ⁇ m by means of the generated ozone; and e) reducing the amount of ozone contained in the gaseous medium to less than or equal to 100 ⁇ g / m 3 (about 0.05 ppm).
• the method according to the invention can be carried out, for example, by means of the device according to the invention described above.
• the method according to the invention substantially the same advantages can be achieved, which have already been explained above in connection with the device according to the invention.
• the process of the invention is carried out as a continuous flow process. In this way it is possible to effectively clean even large quantities of the gaseous medium from the particles.
• steps a) and b) take place simultaneously (or substantially simultaneously). Furthermore, it is preferable to carry out steps b) and c) simultaneously (or substantially simultaneously).
• steps c) and d) can take place simultaneously (or substantially simultaneously).
• step e) reducing the proportion of ozone contained in the gaseous medium by means of a catalytically active agent which promotes the conversion of ozone to oxygen.
• a particularly advantageous preferred embodiment of the method according to the invention provides that at least steps c) and d) are performed approximately simultaneously in a same volume element of the gaseous medium.
• two cleaning or filtering functions on the one hand for the particles larger particles 0.1 microns and the other for the particles less than or equal to 0.1 microns
• FIG. 1 shows a schematic longitudinal sectional view through a device according to the invention according to a first embodiment
• FIG. 2 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a second embodiment
• 3 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a third embodiment
• FIG. 4 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a fourth embodiment
• Fig. 5 is a schematic longitudinal sectional view through an inventive device according to a fifth embodiment.
• FIG. 1 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a first embodiment.
• This device is used to clean a contaminated with a group of particles gaseous medium (in this case, air), which group has particles P G larger and particles P ⁇ less than or equal to 0.1 microns.
• the device has a flow channel 2 with a channel inlet 2a and a channel outlet 2b.
• a pressure fan 4 for forcibly passing the air through the flow channel 2 is arranged.
• the direction of flow of the air flow in the flow channel 2 is indicated by arrows L.
• the flow channel 2 further has an ionization region B, with an ionization device for ionizing the particles P G , P K contained in the air.
• This ionization device is provided with a thin, wire-shaped discharge electrode 6, which is connected via an electrical line 8a to a high voltage source 8 (first electric potential).
• the ionization by means of the discharge electrode 6 is then carried out by the so-called. Corona effect.
• the area around the discharge electrode 6, in which the corona effect is sufficiently effective, is indicated schematically in FIG. 1 by a dashed line.
• an ozone generating device is further arranged, which serves to generate ozone in the air.
• This ozone generating device has an ozone generation capacity ranging from 200 ⁇ g / m 2 (about 0.1 ppm) to 1,000 ⁇ g / m 3 (about 0.5 ppm).
• the discharge electrode 6 serves as the ozone generating means at the same time.
• the flow channel 2 is further provided with an electrostatic precipitator 10 having a particle collecting area Bs.
• the electrostatic precipitator 10 forms an electrostatic precipitator for electrostatic precipitation of ionized particles P G larger than 0.1 ⁇ m.
• the particle collecting region B s is essentially formed by two plate-shaped collector electrodes 12, which lie opposite one another at a distance, and which define two side walls of the flow channel 2.
• the collector electrodes 12 are connected to a second and / or third electrical potential (electrical high voltage).
• the length of the collector electrodes 12 in the direction of flow L may vary depending on the embodiment of the device according to the invention and consequently deviate from the variant shown schematically in FIG.
• the ozone production of the ozone generating device ie, here the discharge electrode 6, is proportional to the flow strength I, which flows between the discharge electrode 6 and the collector electrodes 12.
• the distance R between the discharge electrode and an adjacent collector plate 12 can be considered as an ohmic resistance.
• the distance or resistance R and the flow strength I is therefore approximately the Ohm's law
• the regulation of the ozone production or the control or regulation of the ozone content can therefore be realized either by changing the size of the high voltage U, the current I or the distance R (which occurs here as a resistor) between the discharge electrode 6 and the relevant collector electrode 12.
• the distance R is structurally fixed.
• the flow channel 2 has a particle oxidation region Bo for oxidizing ionized particles P K smaller than or equal to 0.1 ⁇ m by the generated ozone.
• the ionization region B 1 , the particle collection region B s and the particle oxidation region Bo overlap at least partially.
• the flow channel 2 is further provided with an ozone reducing device 14 which is connected downstream of the particle oxidation region Bo and defines an ozone treatment region B B (ie a region in which the ozone is subjected to a treatment).
• the ozone reducing device 14 is designed to reduce the content of the ozone contained in the air to less than or equal to 100 ⁇ g / m 3 (about 0.05 ppm).
• the ozone reducing device 14 has at least one ozone filter 16, which has a catalytically active agent 16a, which promotes the conversion of ozone to oxygen.
• the catalytically active agent 16a was manganese oxide.
• the ozone filter 16 is arranged in the channel exit 2b.
• the ozone filter 16 has an in the flow channel 2 integrated, removable flow grille 16b, the surface of which is provided with the catalytically active agent 16a.
• the apparatus is further equipped (optionally) with a controller 18 for controlling the amount of ozone to be generated by the ozone generating means 6.
• the control device 18 is associated with a particle sensor 20, which detects the amount of particles P K , which are less than or equal to 0.1 microns and are contained in the air, which enters the flow channel 2.
• the particle sensor 20 supplies via a signal line 22 to the control device 18 a measurement signal representing the amount of the detected particles P k smaller than or equal to 0.1 ⁇ m.
• the control device 18 controls and / or regulates the quantity of the ozone Generating device 6 to be generated ozone and thus the amount of ozone in the air in the flow channel 2.
• control and / or regulation can be done for example by changing the voltage applied to the ozone generating / discharge electrode 6 high voltage.
• the control device 18 is functionally coupled to the high voltage source 8.
• the level of the ozone content could also be affected by the ozone generating power of this device.
• Step a The compressed by the pressure fan 4 in the flow channel 2 air is ionized by means of the discharge electrode 6.
• the particles P G , P K contained in the air are also charged larger and smaller than 0.1 ⁇ m.
• Step b Since the discharge electrode 6 in this case also as ozone Generating device is generated, with an appropriate size of the high voltage U and the current I simultaneously with the ionization and charging of the particles P G , P K also an ozone content or ozone content in the air generated in a range of 200 micrograms / m 3 ( about 0.1 ppm) to about 1000 ⁇ g / m 3 (0.5 ppm) (step b).
• the steps a) and b) are thus carried out simultaneously or substantially simultaneously.
• the ionized particles are electrostatically deposited on the collector electrodes 12. In this case, particles P G greater than 0.1 ⁇ m are mainly detected (step c).
• the generated ozone are primarily the ionized particles P ⁇ , which are less than or equal to 0.1 microns, oxidized and thus destroyed, decomposed or rendered harmless (step d). Since the ionization region B 1 extends partially around the discharge electrode 6 as far as into the particle collection region Bs, steps b) and c) thus take place simultaneously or substantially simultaneously. Further, since the ozone produced by the ozone generating means (here: discharge electrode) 6 is carried by the air in the flow direction L through the flow channel 2 and also passes through the particle collecting area B s , the steps c) and d) are carried out successively. also at the same time or almost simultaneously.
• the proportion of ozone contained in the air by means of the catalytically active agent 16a is reduced to a proportion of less than or equal to 100 ⁇ g / m 3 (about 0.05 ppm) (step e).
• the thus cleaned of the particles P G , P K and essentially free of ozone air leaves the ozone filter 16 and the channel output 2 b of the flow channel 2 in the flow direction L.
• Fig. 2 shows a schematic longitudinal sectional view through an inventive device according to a second embodiment.
• the particle collection region Bs is designed differently.
• the two plate-shaped collector electrodes 12 are each outwardly bulged (12a), resulting in an extended flow channel intermediate region 2c.
• a flow-around, rod-like body 24 is arranged, which extends over the entire height of the flow channel 2.
• the plate-shaped collector electrodes 12 are connected to a first electric potential.
• This first electrical potential is earth in the present embodiment.
• the rod-like body 24 in turn is connected to a second electrical potential, ie in this case to a high voltage electrical.
• a particularly shaped electric field is formed (indicated in FIG. 2 by arrows 26), which contributes to an increase in the deposition power for the particles P G greater than 0.1 ⁇ m.
• a portion of the flow-shaped inner surface of the flow channel 2 (namely, the inner surface of a flow channel L downstream of the ozone filter 16 in the flow direction L) is formed as an additional ozone filter and provided with the catalytic agent 16a.
• the means 16a on the ozone filter 16 is not shown pictorially in FIG.
• FIG. 3 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a third embodiment.
• the fan is designed as a suction fan 28, which is arranged in an end region of the flow channel 2.
• the suction fan 28 is formed in this example as a radial fan. It can, however basically be designed as axial fan.
• the special feature of the variant according to FIG. 3 is that at least part of the suction fan 28 is designed as an ozone filter.
• the portion of the suction fan 28 designed as an ozone filter is a flow-attached surface of the suction fan 28 associated with the air passing through the fan.
• This surface is provided with a catalytically active agent 16a.
• the suction fan 28 has fan blades 28a having a relatively large surface area. This surface of the fan blades 28a is provided with a catalytically active agent 16a. In principle, however, other surfaces of the suction fan 28, which come into contact with the air passing through the fan, may be provided with the catalytically active agent 16a.
• a partial region 2d of the flow-bearing inner surface of the flow channel 2 which is connected downstream of the ionization device and its discharge electrode 6 (and also preferably the particle collection region B s ) and upstream of the suction blower 28, provided with the catalytically active agent 16a.
• FIGS. 4 shows a schematic longitudinal sectional view through a device according to the invention in accordance with a fourth embodiment.
• This variant essentially represents a combination of the embodiments according to FIGS. 2 and 3.
• Fig. 5 shows a schematic longitudinal sectional view through a device according to the invention according to a fifth embodiment.
• This variant largely corresponds to that according to FIG. 1.
• the ozone filter is designed as a porous ozone filter 32.
• This Porous ozone filter 32 is a kind of barrier filter, which compared to the variants of FIGS. 1 to 4 has an increased flow resistance.
• a very high ozone reduction performance can also be achieved.
• the device according to the invention and the method according to the invention may also assume other than the embodiments or embodiments specifically described above.
• the device may in particular have features that represent a combination of the features of the exemplary embodiments explained above.
• the flow channel with an ozone prefilter, which is downstream of the ionization device and its discharge electrode downstream of the flow directions and upstream of the ozone filter or main ozone filter.
• ozone prefilter downstream of the ionization device and its discharge electrode downstream of the flow directions and upstream of the ozone filter or main ozone filter.
• the ozone generating capacity in the apparatus and the method according to the invention is particularly preferably in a range from 200 ⁇ g / m 3 (about 0.1 ppm) to 1000 ⁇ g / m 3 (about 0.5 ppm), the Ozone generating capacity may in certain cases also be considerably greater than 1000 ⁇ g / m 3 , eg 1500 ⁇ g / m 3 to 5000 ⁇ g / m 3 . Even then, the advantages of the invention are still achievable.
• Several of the flow channels of the device can also be connected in parallel and have a common or separate blower. If the device does not have a fan, the gaseous medium can also be passed, for example, by natural convection through the flow channel.
• the device can at Need also be equipped with other filters and a heat exchanger.
• Flow channel a Channel input of 2 b Channel output of 2 b1 Flow channel output area c Extended flow channel intermediate d Subarea of 2 e Subrange of 2 pressure blowers Discharge electrode (simultaneously ozone generator) High voltage source a Electrical line 0 Electrostatic precipitator 2 Collector electrodes 2a Bulges of 12 4 Ozone reduction device 6 Ozone filter 6a Catalytically active agent 6b Flow grid 8 Control device 0 Particle sensor 2 Signal line 4 Flowable rod-like body 6 Electric field 8 Suction blower 8a Blower blades of 28 0 Sheath of 28 2 Porous ozone filter B B ozone treatment area

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electrostatic Separation (AREA)
• Oxygen, Ozone, And Oxides In General (AREA)
• Exhaust Gas Treatment By Means Of Catalyst (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39166422

Family Applications (1)

Country Status (3)

Citations (3)

Family Cites Families (5)

• 2006
  • 2006-12-11 ES ES200603221A patent/ES2301414B1/es not_active Expired - Fee Related
• 2007
  • 2007-12-07 DE DE202007018887U patent/DE202007018887U1/de not_active Expired - Lifetime
  • 2007-12-07 WO PCT/EP2007/063515 patent/WO2008071633A1/de active Application Filing

Patent Citations (3)

Also Published As

Similar Documents

Legal Events