CN1038414A - Air treatment system - Google Patents

Abstract

A kind of air treatment system, comprise preferably a corona electrode of lead shape (K) and a breathable target electrode (M) that is provided with around corona electrode coaxially, corona electrode and target electrode are received two opposite polarity lead-in wires of a dc source respectively or are extremely gone up.Corona discharge produces air ion and forms the so-called ion wind of passing through target electrode.This system also comprises air processor, as handle the device of air and/or change air themperature by machinery, static or chemical means.

Description

Air treatment system

The present invention relates to an air conveying system, especially also relate to carrying air to be for further processing, as remove air-borne particulates and/or staticize gas and/or heating or cooling air etc., simultaneously, use so-called electron ion wind or corona wind as effective air pumped (conveying) medium.

It is well-known carrying air by means of so-called electron ion wind or corona wind.The system that sets up for this purpose mainly comprises a corona electrode and a target electrode, this two electrode is spaced from each other and links to each other with corresponding dc source terminal or electrode, wherein the profile of corona electrode, mutually the distance between potential difference and corona electrode and the target electrode etc. all is to cause at corona electrode to form corona discharge and produce the factor of air ion.Therefore, the air ion of generation is moved to target electrode rapidly under the electric field action between corona electrode and the target electrode, and these ions discharge their electric charge at target electrode.Along this path between moving period, the electroneutral air molecule of ionic bombardment is also passed to these molecules with electrostatic force, also these air molecules is inhaled to target electrode, so carry air with the form of so-called ion wind or corona wind at these ions.This air conveying system is described in International Patent Application PCT/SE85/00538 and illustrates.

As what from this international patent application, seen, by means of ion wind or corona wind obtains bigger air velocity and rate of air circulation is possible.Yet when corona electrode and target electrode a good distance off, in order to keep corona discharge, must make has very big potential difference between corona electrode and the target electrode, just only can obtain high efficient under this condition.Cause that the big corona current that air velocity improves and rate of air circulation strengthens can produce such defective, promptly can near corona electrode, increase the generation of compound (mainly being bromine oxygen and nitrogen oxide), these materials can be because of there being serious excitant to be found out by the people, they in addition understand the health of harm humans.Therefore, people wish to provide the corona current of size appropriateness and make corona electrode and target electrode is separated by far away.Can also see that from this international patent application the corona electrode of this system of must carefully screening does not drift about or migration towards the direction of target electrode with the air ion that prevents to produce.Though people wish to obtain higher volume turnover rate, but just be not used to carry air in this system, promptly play a blower fan merely, but also to handle the air of being carried, when promptly will purify the air that has pollutant and/or changing air themperature, obtain very high flow velocity with regard to unnecessary making by the air of system.In fact, this system will realize this dual purpose, preferably adopt low air velocity, this is because near the air of air processor that low flow velocity can cause being installed in the system has the long time of staying, and can obtain higher efficient equally, and needn't make the direction that this device flows along air increase the axial distance that stretches, target electrode in the system and corona electrode are surrounded by the discharge in the air-flow, air processor in the system and target electrode put together or are placed on the downstream part of target electrode, this is the most common modal system architecture, and this system architecture has been found obvious defects.For example, it is difficult in and obtains even velocity on the entire cross section of the dust that flows and distribute.Uneven VELOCITY DISTRIBUTION will reduce the efficient of air processor again.When air flows through dust, also be difficult to avoid the very big resistance that causes to air processor, had this resistance just to need to increase potential difference between corona electrode and the target electrode, so that strengthen corona current.Yet, increase this mode of remedying of potential difference and can cause that bromine oxygen and NOX generate the defective that increases.In addition, the staubosphere that surrounds electrode can produce interference effect to corona electrode, carries out the discharge of corona electrode and produces corona current in the rational and effective mode such as the meeting overslaugh.

Therefore, the purpose of this invention is to provide a kind of described above the sort ofly carry and air treatment system through improved air, this system can overcome the problem of discussing above most of at least.

The objective of the invention is to reach like this, a kind of air treatment system promptly is provided, it comprises that a corona electrode and at least one and this corona electrode are spaced apart, and can be through the target electrode of air, also comprise a dc source, its utmost point is received on the corona electrode, another utmost point is received on the target electrode, in this system, the shape of corona electrode, conditions such as potential difference between corona electrode and the target electrode and distance make the air ion that can occur producing corona discharge at the corona electrode place, and have at least a target electrode to be arranged on around the corona electrode substantially symmetrically, and around be arranged in one with the coaxial circle of this corona electrode on.

The favourable situation that further develops that basic principle of the present invention and it is contemplated that obtains is done detailed explanation according to some embodiment that enumerate with reference to the accompanying drawings.

Fig. 1 and Fig. 2 are respectively axial section and the radial section schematic diagrames of first embodiment of system of the present invention;

Fig. 3,4,5 and 6 is by instantiation, expresses schematically that the present invention is various to be it is contemplated that the target electrode structure that obtains and be arranged on air processor in the system;

Fig. 7,8,9,10 and 15 schematically expresses the various devices that dream up that are close to corona electrode in the system of the present invention by instantiation, and these devices are to be used to eliminate the pernicious gas that corona electrode produces;

Figure 11 schematically expresses the radial section figure of second embodiment of system of the present invention.

Figure 12 schematically expresses the axial section of the 3rd embodiment of system of the present invention;

Figure 13 and 14 is schematically expressed the radial section figure of another embodiment of system of the present invention.

System of the present invention shown in Fig. 1 and Fig. 2 example includes a corona electrode K, and it is made up of the thin wire that extends between the good electrode holder 1 of design, and these electrode holders illustrate that just the face of land goes out.Also include a target electrode M in this system, it is hollow cylinder and round corona electrode, and with the coaxial extension of corona electrode.In the diagram present embodiment, target electrode M is made up of the wide screen eye web plate that conductive material or semiconductive material are made, and it is positioned at annulus 2(such as the plastic circle ring of being made by insulating materials) between, this annulus is supporting (not shown) in certain suitable mode.Corona electrode K and target electrode M are connected on the terminal or electrode of dc source 3 separately.Voltage between corona electrode and the target electrode and distance, promptly the diameter of target electrode M should be matched suitablely, makes and can corona discharge occur at corona electrode K place.The ion that corona discharge produces to target electrode M drift or migration, causes air stream to flow towards target electrode again under effect of electric field then.The reader can be with reference to the detailed description of in the above-mentioned international patent application this situation that takes place being done.Therefore in system of the present invention, be that mode with 4 indications of arrow among Fig. 1 produces air and flows, i.e. the axle head of the opening of hollow cylindrical target electrode M is crossed in circulation of air, radially passes ventilative wall then basically and outwards flows.

The M of target electrode shown in the figure has some significant advantages around the kind electrode device of corona electrode K coaxially.For example, adopt this device, can make corona discharge appear at symmetrically whole corona electrode K around, therefore can obtain sizable total corona current; Because potential difference between corona electrode and the target electrode and adjacent distance are constant, therefore can obtain the target electrode described in above-mentioned international patent application and the arrangement of corona electrode.On the other hand, can adopt little potential difference and constant corona current.Can also see that air stream is very slow at the flow velocity of pressing close to corona electrode K place.Because the pernicious gas that corona discharge is produced can be easy to become innocuous gas as ozone and nitrogen oxide (NOX), so this is a great advantage.Below will be for a more detailed description to this.Another very important advantage of the present invention is for example can provide very big flow region by cylindrical target electrode M and cause low accordingly flow velocity.This low flow velocity also has very big superiority, because low flow velocity can make air dispose suspended particulate contaminants and/or gas pollutant effectively, perhaps can be by means of the appropriate device heating or the cooling air that are arranged in the gas channel, the optimum position of handling the air effect is the place that is close to or is close to hollow cylindrical target electrode M radial outside, or, perhaps handle air in these two positions simultaneously the open end of this electrode (air is exactly to flow into electrode with this openend).Because these position circulating areas are very big, so the resistance that is caused by air processor is not very big just.In addition, because corona electrode is all surrounded by target electrode basically, so these following phenomenons can never take place, promptly work as corona electrode and target electrode and every a segment distance place ring shielding electrode is set as a wall, these bucking electrodes preferably are connected on the circuit identical with the corona electrode current potential.This ring shielding electrode is schematically expressed in Fig. 1, referring to indicating the S place among the figure.

The target electrode M of system of the present invention is illustrated in the example of Fig. 1 and 2, supposes that the wide screen eye web plate that this target electrode is made by conductive material or semiconductive material forms.Should be noted that then the current value that this target electrode receives is extremely little, and " conduction " of indication or " semiconductive " should be interpreted as making the material of target electrode.Therefore, in fact the electric conductivity of the material of manufacturing target electrode may be very low.Be appreciated that target electrode M also can have other shape.Such as, target electrode can be made up of more axially extended bars, these bars be arranged in with being spaced from each other corona electrode K around and be with a coaxial circle of corona electrode on.On the other hand, target electrode also can be by forming along the axial of corona electrode K and with plate electrode element or layered electrode element that corona electrode be arranged in parallel, and the side surface of these elements radially extends, promptly with parallel by target electrode airflow direction radially.Target electrode also can be made up of many flat ring electrode elements, and these elements are spaced from each other vertically, be arranged in corona electrode K around, and coaxial with corona electrode.Target electrode also can be made with helical form lead or thin slice, coaxially the form of arranging round corona electrode.

Above-mentioned air processor can have different forms, and these devices are best contiguous with target electrode M, perhaps places the radial outside of target electrode.For example, air processor can include traditional, be used to purify the mechanical filter of the air that contains microactuator suspension dust pollution thing, be particulate, drop or chemism filter, activated carbon for example is housed, is used to remove airborne gaseous contaminant, because the pollution suspended particulates of following air-flow to flow out target electrode M are charged, so because corona discharge will produce ion, these charged pollution suspended particulates can lean on static to attract to come out from air-flow.In order to reach this purpose, can adopt for example a kind of ventilating structure, this ventilating structure can adopt and be positioned at the thin layer form that the target electrode outside is made by electret.Because polarity that target electrode is with is opposite with charged pollution polarity that suspended particulates are with, when so pollutant surrounds such through-flow dust, because the inner surface dust of wall is an electric insulation, and face of wall is conduction and ground connection, causes serious interference can for like this function of corona electrode K.

Have found that, when the kind electrode length of corona electrode K when stretch out vertically at the axial two ends of target electrode M has certain advantage.The device identical with target electrode M length with corona electrode K can make the electromotive force potential drop between corona electrode and the target electrode low than long corona electrode by comparison, and corona current is constant simultaneously, but also the total volume of air circulation by system is increased.The corona electrode K of system of the present invention and the radial distance between the target electrode M should be greater than 5cm, preferably greater than 8cm.In the system shown in Fig. 1,4, the radius of target electrode M, i.e. distance between corona electrode K and the target electrode M can equal the axial height of target electrode M approx.For example, when the radius of target electrode M was 10cm, corona electrode K can exceed axial two ends 3～4cm of target electrode M.

As shown in Figure 1, it is favourable that corona electrode K links to each other with voltage source 3 by high resistance measurement 5 with target electrode M, like this, under the situation of corona electrode K or target electrode M short circuit (for example being caused by unconscious contact), the size of short circuit current can be limited within the abampere total head.In other words, this system can not cause danger because of contact.In order to prevent that the people from directly contacting corona electrode or target electrode, the possibility of electrostatic field perhaps appears, at the outer setting protection network of axial two openends of target electrode M for the elimination system.This protection network can be made with plastic material, perhaps when the needs electrostatic screen, with semiconductive material or conductive material manufacturing, when adopting a kind of protection network in back, preferably with its ground connection, these several protection networks can be placed on from several centimeters in the end of corona electrode K (from axially), and can extend to the outer fringe surface of plastic circle ring 2.Corona electrode K is connected on a suitable positive potential or the negative potential (with respect to ground), target electrode M is connected on the opposite polarity current potential (with respect to ground) can prevents that corona current from flowing to protection network simultaneously.This arrangement has also reduced greatly because the Insulation Problems that high voltage (with respect to ground) may cause.For the corona current that further prevents corona electrode K flows to unwanted direction, can attracted on the target electrode to meeting with corona electrode K end axis, therefore, target electrode can be advantageously used for the pollutant deposition surface in the electro static filtering apparatus.Regulate that gas flow temperature promptly heats or when cooling off air when needs, the transverter with appropriate configuration can be disposed radially the outside at the cylindrical target electrode.

Fig. 3-6 illustrates the outer shape and the various circulation of air treating apparatus that can adopt of various different target electrodes by example.

Target electrode M shown in Figure 3 has the profile of target electrode represented among Fig. 1 and 2.In the embodiments of figure 3, target electrode M also has a hollow cylindrical electrode R who is disposed radially, it is made up of the perforate web plate of making of conductive material or semiconductive material, and ground connection, like this, electrode R just has current potential, and the polarity of the relative target electrode M of this current potential has the polarity identical with corona electrode K.As previously mentioned, owing to produce ion, the airborne particulates pollutant is charged, and they are striven being adsorbed onto and have on the target electrode M opposite polarity with it.These pollutants can just not be drawn onto on the target electrode M immediately, but pass this target electrode as the crow flies earlier, are forced to suck back target electrode M place again then under the electric field action between target electrode M and another electrode R, and will inevitably be bonded at above it.Therefore, must impose on the air-flow that charged contaminants power overcomes radially and pass outwards through electrode M and R by the electric field action between two electrode M and the R.Because the speed of ventilating air is low, so this point is easy to realize.Electrode R can be considered to substitute a reflecting electrode, and it changes the direction of motion of charged contaminants and thereby effectively pollutant is separated from air-flow.

Fig. 4 represents a similarly device, wherein the reflecting electrode R of ground connection is disposed radially the outside at target electrode M, in this case, target electrode is the flat electrodes element that has many ring-types, and these elements also are spaced from each other certain distance vertically round corona electrode coaxially.The electrode member of target electrode M will be as the electrostatic precipitation surface of suspended particulate contaminants in the air-flow.Similar with above-mentioned situation, because the deposition surface of target electrode has suitable big wider space at airflow direction, thereby thereby prolonged near the time of staying of charged contaminants deposition surface and increased possibility greatly to this surface migration.Like this, just, improved clean-up effect.

Fig. 5 has represented a kind of device, and wherein the device of target electrode M and Fig. 4 is similar, includes many flat ring electrode elements, and these elements are arranged on around the corona electrode coaxially, and Axially be spaced from each other certain distance.In the embodiment of Fig. 5, between the electrode member of target electrode M, be provided with similar plane ring-type electrode member 6, they are ground connection and constituted known the sort of electrostatic capacitance separator with the electrode member of target electrode M all.When air when target electrode M moves, charged suspended particulate contaminants is cemented on the electrode member of this target electrode under the electrode member and the electric field action between the electrode member 6 of target electrode M.Because air velocity is low, so the time that pollutant stops between electrode member M and 6 is just long, air cleaning efficient is improved.

Represented arrangement of electrodes and Fig. 3's is similar among Fig. 6.The arrangement of electrodes of Fig. 6 comprises a target electrode M and a reflecting electrode R who is disposed radially in the target electrode outside.Electrostatic separator of the common formation of target electrode and reflecting electrode, its effect is according to the mode of Fig. 3 suspended particulate contaminants to be separated from air draught.Transverter 7 with suitable configuration also is housed in the device of Fig. 6, and this transverter is cylindrical in this example, radially is placed on the outside of reflecting electrode R and surrounds reflecting electrode.Transverter 7 can change the temperature of air-flow, that is to say to make air heat or cooling.But have bigger circulating area, and because the flow velocity of air draught is low, so transverter 7 has very high efficient by transverter 7.And the mode that constitutes transverter can guarantee that the air-flow that flows through transverter can not form bigger resistance.Because suspended particulate contaminants can be separated from air effectively on target electrode,, do not need to clean or change so transverter 7 can keep clean.But must clean target electrode M, or just change electrode at regular intervals.If with connecting line ground connection, transverter 7 itself also can constitute reflecting electrode, can cancel reflecting electrode R like this.

Figure 12 is the axial section of another useful embodiment of system of the present invention.Embodiment difference among this embodiment and above-mentioned Fig. 1 and 2 is that an axial end of its target electrode is by impermeable dull and stereotyped 15 sealings, in order to replace plastic hoop 2.The central part of circular slab 15 is preferably adorned an insulating materials, in order to connect the end of corona electrode K.From one section radial distance of circular slab 15 central parts, one section conductive material or semiconductive material are arranged, or the coating of this material, the best ground connection of this material.The target electrode M of Figure 12 embodiment has the sort of structure shown in Figure 5, and the earth electrode element 6 of ring-type is also to be provided with the similar mode of Fig. 5 embodiment.The air-flow of system shown in Figure 12 is along the path flows of arrow 4 indications.In this structural system, the axial height of target electrode M equals half of axial height of the target electrode of system shown in Fig. 1 and 2 or device approx.

As mentioned above, when adopting system of the present invention, near the air velocity the corona electrode K is very slow, and this just is easy to remove effectively harmful or hazardous gas, and these gases are become innocuous gas, these danger or pernicious gas mainly are foul smell and the nitrogen oxide that produces with corona discharge.

For example, by means of device shown in Figure 7, the form that corona electrode K can lead (schemes) to support not shown by rights along the central shaft of hollow cylindrical target electrode (Fig. 7 is not shown).The element 8 of small sleeve shape is fixed to the two ends of corona electrode K, and element 8 is equipped with chemically reactive substance (as activated carbon).These materials can absorb or the above-mentioned pernicious gas as ozone or nitrogen oxide of catalytic decomposition.Because very little, so this method is very effective near near the electric current the corona electrode K.As shown in Figure 7, these chemism absorber elements 8 can be received than on the low slightly current potential of corona electrode K, thereby element 8 just can play exciting electrode or exciting element, make corona electrode K keep corona discharge, reduce the potential difference between corona electrode and the target electrode simultaneously.

Figure 15 further illustrates a kind of similar device, and near the pernicious gas that this device is used for producing corona electrode owing to corona discharge becomes innocuous gas.In the present embodiment, have many vertically apart from one another by the annular plate of arranging 21 coaxially round corona electrode K, plate 21 is equipped with chemically reactive substance or with the surface of chemically reactive substance coated board, the pernicious gas that this chemically-reactive substance mass-energy absorbs or catalytic decomposition produces owing to corona discharge.Because near the air-flow the corona electrode is very little, so plate 21 can be converted into innocuous gas with these gases in very effective mode.The visible trend that these gases are not taken away by gas.The air ion that corona discharge produces can free migration to the target electrode (Figure 15 is not shown) between the annular slab 21 on every side.In order to prevent that 21 couples of corona electrode K of plate from having shielding action and disturbing corona discharge, plate 21 is the ground connection by the very big resistance 22 of resistance preferably, so that the electric charge that plate 21 is received passes away.Plate 21 can be made by conduction, semiconductive or insulating materials.Be appreciated that, comprise or be equipped with can absorb or other structure of the chemically reactive substance of catalytic decomposition pernicious gas also can be arranged on corona electrode K around, suppose also that simultaneously this structure has the geometry that ion is passed through, and suppose that this structure is connected one and can produce on the current potential of shielding corona electrode.

Fig. 8 illustrates another kind of device, and this device is used for from removing near the corona electrode K by being harmful to or hazardous gas that corona electrode produces.This device include one with the pipe 9 that links to each other as extractor fan (not shown)s such as blower fan or air pumps, the inlet 9a of pipe 9 directly faces toward the end of corona electrode K vertically, therefore be present in around the corona electrode, the air layer that contains above-mentioned pernicious gas, under the effect of exhausting, constantly extracted out by pipe 9.Because the air-flow around corona electrode K is very little, therefore, have only gas in a small amount to take away by managing 9.By managing 9 air of taking away, together be pumped to the device that be used for Purge gas with the pernicious gas of following by extractor fan, perhaps in certain suitable position, promptly them are drained in this gas position that can not constitute harm.As shown in Figure 8, the pipe 10 that links to each other with the compressed air source (not shown) is arranged on the other end of corona electrode K, with steering current along corona electrode K towards exhaust column 9 direction move, enter exhaust column 9 then.This will be more effective in order to the method for carrying the pernicious gas that is produced by corona discharge.Pipe 9 and 10 also can be used for exciting electrode, and method is that an end that will guarantee pipe at least conducts electricity, and above-mentioned pipe is received than on the low slightly current potential of the current potential of corona electrode then.

Fig. 9 illustrates another embodiment, and this embodiment is used for similar purpose, and it includes a ported sub 11 that is provided with along hollow cylindrical target electrode central shaft.Yet ported sub 11 is connected to an extractor fan (not shown) that matches in the embodiment of Fig. 9 in the mode of the pipe in Fig. 89, the end of pipe 11 is sealed, like this, the air that is sucked will be only by the hole on the tube wall, in this case, corona electrode is made up of the electrode member K of many lead shapes, and these elements be arranged in parallel round pipe 11 and with pipe 11, like this, corona current is just passed to target electrode (not shown Fig. 9) on every side from all directions.In order to reduce necessary potential difference between corona electrode and the target electrode, the mode as described of also having pipe 11 encourages the function of corona electrode, method is with conductive material or semiconductive material manufacturing pipe 11, and will manage 11 and receive than on the low slightly current potential of the current potential of corona electrode K.

As shown in figure 10, opposite arrangement also can be used to remove near ozone and the nitrogen oxide that abuts against the corona electrode.In the embodiment of Figure 10, round corona electrode K and with corona electrode some (such as three or four) perforated pipes 16 are being set abreast, these Guan Yuyi axle wind apparatus link to each other, and can take away by the cinclides of ported sub 16 abutting against near the air of corona electrode K like this.These pipes 16 also have the beneficial functions that can encourage corona electrode K, and its method also is to make these pipes with conductive material or semiconductive material, and these pipes are received than on the low slightly current potential of the current potential of corona electrode K.

From being calculated, the theory that above-mentioned international patent application carried out to learn, distance between corona electrode and the target electrode, promptly pressing shown in Fig. 1 and 2 the diameter of target electrode M in the system, is according to the size of potential difference between corona electrode and the target electrode and required corona current and definite.Therefore, if utilize the device of Fig. 1 and 2,, just can not increase the cumulative volume circulation of air only by the size of aggrandizement apparatus and the diameter of increase target electrode.Just need the bigger device of axial length if will increase the volume turnover rate of air.But, if increase the axial length of device, will reduce the area that is positioned at cylindrical target electrode axial open end import department, the reducing of this area is for the lip-deep discharge area of the porous circular cylinder of above-mentioned electrode.The increase that reduces to cause flow resistance of inlet-duct area may also can cause the air-flow skewness by target electrode.Device described in Figure 11 has solved this predicament well.This device is equipped with some air propulsion device 12, each air propulsion device is all pressed the structure setting among above-mentioned Fig. 1 and 2 embodiment, these devices are spaced from each other certain distance vertically and are arranged in order, so just, form a space between neighboring devices 12, air can be pressed the type of flow of arrow indication among Figure 11 by in this space inflow device 12.This embodiment of system of the present invention can also install an air processor, as cylindric transverter and/or chemical absorbing body 13, air processor is provided with around air propulsion device 12, and and air propulsion device between separated by a distance, like this, the air that flows into and flow out just all passes through transverter 13, perhaps other air processor by being provided with in a similar manner.

Figure 13 illustrates the axial sectional drawing of another embodiment of system of the present invention.This embodiment has bigger axial length so that increase the total volume of air circulation.They are arranged on its target electrode is divided into several (being two in the present embodiment) arc-shaped electrode element M1 and M2 coaxially on the same periphery of corona electrode K, between them apart from one another by one section circular arc distance, so at target electrode element M1, form a space 14 between the M2, system shown in air-flow just passes through by the direction shown in the arrow of Figure 13, just be radially by target electrode element M1 basically, space 14 between the M2, and radially flow out by these electrode members basically.The circulation area in each space 14 preferably equals by target electrode M1, the circulation area of M2.In structure shown in Figure 13, around the corona electrode of center, two or more arc target electrodes are set coaxially.If the radius of curvature of arc target electrode less than it to the radial distance of corona electrode, promptly the end of each arc-shaped electrode to the distance of corona electrode less than this target electrode middle body to corona electrode apart from the time, then be favourable.Signal has been made in Figure 14 contrast.Have been found that said structure will make the air-flow by the whole circulation area of target electrode distribute more even.

Figure 14 also illustrates the embodiment of two arc target electrodes different, that can imagine.The target electrode M1 that is illustrated in figure left side is by many plate electrode elements, or the sheet electrode element forms, and these elements are parallel to each other, and with the setting that axially meets at right angles of corona electrode K, the mode shown in this and Fig. 4 is basic identical.In the present embodiment, with auxiliary electrode element ground connection, these electrodes are equivalent to the electrode member 6 among Fig. 5 embodiment, and these auxiliary electrode elements can be arranged between the target electrode element.Target electrode M2 shown in Figure 14 right side is made up of many plate electrode elements or sheet electrode element, and they represent a slice wherein in insulating end plate 17(figure) between extend vertically, these elements are to be positioned in the radial position of corona electrode R basically.Target electrode element M2 is arranged between plate electrode element or the sheet electrode element 18, and element 18 is provided with in the mode that is similar to target electrode element M2, but will be with they ground connection.These electrode members 18 have the effect identical with the electrode member 6 described in Fig. 5, and therefore, they and target electrode M2 be common to constitute an electric capacity separator.If these auxiliary electrodes 18 are a bit larger tham the distance of target electrode element M2 to corona electrode K to the distance of corona electrode K, then be favourable, because corona current can not pass through electrode member 18 basically like this.

If the device shown in employing Figure 13 and 14, can very effectively ozone and nitrogen oxide be removed, its method is that the air of comfortable compressed air source in the future is by a slit shape air channel 19 that is attached thereto, then from one of the corona electrode K corona electrode K that blew side, meanwhile, by a similar slit shape air channel 20 that links to each other with extractor fan, air is evacuated to the opposite side of corona electrode K, therefore, be respectively equipped with air port 19a and 20a on the air channel 19 and 20, these air ports face corona electrode K, and it is shaped as slit shape, and along extending perpendicular to the direction on diagram plane, the length of extension is the whole length of corona electrode K substantially.The corona discharge at corona electrode K place can not obviously be disturbed in air channel 19,20, thereby can not change potential difference required between corona electrode and the target electrode significantly yet.The air channel 19 and the 20 couples of corona electrode K also can play the effect of exciting electrode.The mode of exciting electrode is with foregoing identical, promptly air channel 19,20 at least will near the part of corona electrode K with conductive material or semiconductive material manufacturing, and this part received than on the low slightly current potential of the current potential of corona electrode K.

Structure shown in Figure 13 and 14 and Fig. 1,2 or structure shown in Figure 12 have identical substantially advantage.

The quantity that is appreciated that set arc target electrode can be more than two, such as can three or four.Be further appreciated that on the other hand target electrode also mutually diverse ways constitute and can make up (as previously mentioned) with air processor.Target electrode M1 for example embodiment illustrated in fig. 13, M2 can make up (referring to Fig. 3) with reflecting electrode element R1 and R2 respectively.Be further appreciated that air processor can also be arranged on as its contiguous place in the space 14 of air flow inlet.In the system that constitutes in mode shown in Figure 13 or 14, preferably the axial end portion of closed system passes through this end inflow to prevent air.

Claims (24)

1, a kind of air treatment system, comprise that a corona electrode (K) and at least one and this corona electrode are spaced apart, and can be through the target electrode (M) of air, also comprise a dc source (3), its utmost point is received on the corona electrode, another utmost point is received on the target electrode, in this system, the shape of corona electrode, conditions such as potential difference between corona electrode and the target electrode and distance make the air ion that can occur producing corona discharge at the corona electrode place, it is characterized in that, have at least a target electrode (1) to be arranged on corona electrode (K) substantially symmetrically on every side, and around be arranged in one with the coaxial circle of this corona electrode on.

2, according to the described system of claim 1, it is characterized in that having at least a target electrode (1) on the whole circumference of described circle, to extend.

3, according to the described system of claim 2, it is characterized in that having at least a target electrode (1) that a cylindrical substantially spreading range is arranged.

According to the described system of claim 1, it is characterized in that 4, described true target electrode includes several separate parts, and (M1, M2), these parts have identical current potential each other, and are spaced from each other setting round the circumference of described circle.

5, according to the described system of claim 4, it is characterized in that, described target electrode parts (M1, M2) be circular arc and a circumferencial direction extension arranged, this extension and about equally around the circumferencial direction extension in the space (14) between the target electrode adjacent part of described circle.

According to the described system of claim 5, it is characterized in that 6, (M1, M2) have is the extension of partial circle cylindricality to described target electrode parts substantially.

7, according to each described system in the claim 4 to 6, (M1, radius of curvature M2) is less than the radial distance of target electrode to corona electrode (K) to it is characterized in that described target electrode parts.

8,, it is characterized in that corona electrode (K) is the form of lead, and be positioned at the position that the central axis with described circle roughly coincides according to each described system in the claim 1 to 7.

9, according to the described system of claim 8, the length of corona electrode (K) that it is characterized in that lead shape is greater than the length that extends axially of target electrode (M).

10,, it is characterized in that locating, and the pernicious gas material that element (8,21) can absorb or the catalytic decomposition corona discharge produces of chemically reactive substance is housed by means of being arranged near corona electrode (K) according to each described system in the claim 1 to 9.

11, according to each described system in the claim 1 to 9, it is characterized in that will draining and drain simultaneously the pernicious gas material that produces by corona discharge near near the air separation the corona electrode (K) by device, also recyclable air of draining be mixed in this airborne pernicious gas material.

12, according to claim 8 and 10 described systems, it is characterized in that described device includes a pipe that links to each other with extractor fan (9), an end of pipe is facing to the place that extends axially of lead shape corona electrode (K) end.

13, according to the described system of claim 12, it is characterized in that described system also includes a pipe (10), it links to each other with a compressed air source, facing to the other end of described corona electrode (K), steering current or air flow along corona electrode one end of pipe (10) by this way vertically.

14, according to the described system of claim 11, it is characterized in that described device includes perforated pipe (11) on the wall, this Guan Yuyi extractor fan links to each other, and with the coaxial extension of the central axis of described circle, the feature of this system also is, its corona electrode includes the electrode member (K) of some lead formulas, and they are parallel with described pipe (11), and be arranged in pipe (11) around.

15, according to the described system of claim 11, it is characterized in that described device includes pipe porose on some walls (16), they are connected on the extractor fan, and are arranged in parallel around corona electrode with corona electrode (K).

16, according to the described system of claim 11, it is characterized in that described device includes device (19), be used for air from the corona electrode (K) that blew side perpendicular to one of electrode lengthwise position, this system also includes device (20), be used for the opposite side of corona electrode (K) with substantially perpendicular to corona electrode longitudinally direction the air that attracts is drained.

17,, it is characterized in that by being adjacent to target electrode (M) and being positioned at the treating apparatus of target electrode radial outside, to handle the air that radially blows out from target electrode substantially according to each described system in the claim 1 to 16.

18,, it is characterized in that being positioned at cylindrical target electrode (M) corresponding axis by one handles the air-flow that enters target electrode substantially vertically by this openend to the air processor of open end according to the described system of claim 3.

19,, it is characterized in that (M1, the M2) air processor in the space between (14) is handled basically and radially passed through these spaces and leaked-in air by being arranged on each parts of target electrode according to the described system of claim 5.

20, according to the described system of claim 3, it is characterized in that this system includes some cylindrical target electrodes (12) with auxiliary corona electrode, they also are spaced from each other vertically around a common axis setting, so just, between the adjacent target electrode, form an annulus, air processor in this system (13) is arranged in each present situation space, is used to handle the air-flow that radially passes through described space basically.

21,, it is characterized in that described air processor is by means purifying gas flow such as machinery, static or chemistry and/or change the temperature of air according to each described system in the claim 17 to 20.

22,, it is characterized in that the radial distance between its corona electrode (K) and the target electrode (M) is 5cm at least, preferably 8cm at least according to each described system in the claim 1 to 21.

23,, it is characterized in that two axial ends of its cylindrical target electrode (M) are openings according to the described system of claim 3; The axial length of target electrode equates substantially with distance between corona electrode (K) and the target electrode (M).

24,, it is characterized in that an axial end portion of Style Columu Talget electrode (M) seals with air tight manner according to the described system of claim 3; Half of radial distance between the axial length of target electrode and corona electrode (K) and the target electrode (M) equates substantially.

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