CN1297338C - Indoor air purifying method with introduced magnetic field - Google Patents
Indoor air purifying method with introduced magnetic field Download PDFInfo
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- CN1297338C CN1297338C CNB2004100735733A CN200410073573A CN1297338C CN 1297338 C CN1297338 C CN 1297338C CN B2004100735733 A CNB2004100735733 A CN B2004100735733A CN 200410073573 A CN200410073573 A CN 200410073573A CN 1297338 C CN1297338 C CN 1297338C
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- magnetic field
- plasma
- electrode
- collecting plate
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Abstract
The present invention discloses an indoor air purification method with an introduced magnetic field, particularly an indoor air purification method with an introduced magnetic field, which is used for low-temperature plasma. Harmful suspended particles in air are eliminated by using grounding corona discharge plasma of the introduced magnetic field; pre-charging discharging pins are fixed to one side of a grounding dust collecting plate of a pre-charging dust collecting electrode, negative ion discharge pins are fixed to the other side, and the spacing between a high-voltage dust collecting plate and the grounding dust collecting plate is from 1.5 to 2.0cm; both ends of the pre-charging dust collecting electrode are applied with high-voltage DC power supplies and permanent magnets, and voltage is from-6kV to-6.5kV; the harmful gas in the air can be eliminated by using impulsive discharge plasma of the introduced magnetic field. Because of the introduced magnetic field, dedusting efficiency is probably improved by about 4 times, and the purification efficiency of adding a parallel magnetic field is obviously higher than that of adding a vertical magnetic field. A dust collecting power supply is used so as to generate negative ions, and the present invention has the advantages of small volume of a purifier and cost saving.
Description
Technical field
The invention belongs to the crossing domain of electric field and field of environment protection, relate to a kind of air purification method, particularly a kind of low temperature plasma indoor air purification method of introducing magnetic field.
Technical background
At present, the purification method of room air mainly contains absorption, static, anion, photocatalysis, low temperature plasma etc.Absorption method is to utilize some material that adsorption capacity is arranged such as active carbon, Al
2O
3, suspension and small part harmful substance in the adsorbents adsorb air such as silica gel and molecular sieve, thereby reach the purpose of eliminating noxious pollutant.But this method can't be eliminated the air pollution that the odor smell in the room air, pathogen, virus, microorganism and decorations cause at all, exists simultaneously environment is caused secondary pollution, and sorbing material is difficult to regeneration recycling, the shortcoming that cost is high.Electrostatic technique is used for indoor air purification can be continued under people's the condition dynamic to purify sterilization having, and has characteristics such as dedusting effect efficiently (efficiency of dust collection is more than 90%) and degerming simultaneously.But this method can not effectively be removed pernicious gas such as VOCS in the room air.Anion can make the electrical two-stage on bacterioprotein top layer put upside down, and impels bacterium death, reaches the purpose of sterilization and sterilization, and is indoor but this method can not make dust thoroughly clear out of, and degradable organic pollutant effectively.Photocatalytic method can effectively be removed organic pollution and the killing microorganisms in the room air, but it can not solve suspension and the very big fine particulates problem of harm in the room air, and the catalyst micropore is caused catalysqt deactivation by obstruction such as dust and particle easily simultaneously.Non-thermal plasma trap can effectively be removed indoor suspended particulate and organic pollution, but exists the not high shortcoming of purification efficiency.
Summary of the invention
At defective that exists in the above-mentioned prior art and deficiency, the object of the present invention is to provide a kind of low temperature plasma indoor air purification method of introducing magnetic field, can improve purification efficiency, cost is low, volume is little, intelligently remove airborne harmful suspended particulate and pernicious gas.
To achieve these goals, the technical solution used in the present invention is:
(1) utilize the corona discharge plasma of introducing magnetic field to remove airborne harmful suspended particulate:
1) pre-charged collecting electrode is made of staggered stainless steel collecting plate, the collecting plate of interlayer is electrically connected, wherein be fixed with pre-charged spray point on the side of ground connection collecting plate, every row 3-4 root, needle gage is 20mm, every pin 20mm is long, opposite side is fixed with the anion spray point, 6 of every rows, and needle gage is 10mm, every pin 20mm is long, and the spacing between high pressure collecting plate and ground connection collecting plate is 1.5cm-2.0cm;
2) apply high-voltage DC power supply at the two ends of pre-charged collecting electrode, voltage at-6kV between-the 6.5kV;
3) at the two ends of pre-charged collecting electrode permanent magnet is set, the permanent magnet spacing is 4.5cm-6cm, and the coercivity of permanent magnet is 600-900kA/m, and need make the magnetic direction of generation consistent with the electrostatic field direction that is applied.
(2) utilize the pulsed discharge plasma of introducing magnetic field to remove airborne pernicious gas:
1) the discharge of plasma in low temperature electrode is pin-plate electrode, be fixed with and have 6 discharging acusectors on the high-pressure stage of spray point, every row 3-4 root, needle gage is 17mm, every pin 20mm is long, and the high-pressure stage of discharge of plasma in low temperature electrode and the distance between the earthing pole are 2cm-3cm;
2) discharge of plasma in low temperature electrode two ends apply the high voltage narrow pulse power supply, and pulse voltage is amplitude 20kV-22kV, and the rise time is 10 μ s, and pulse frequency is 100Hz;
3) at discharge of plasma in low temperature electrode two ends permanent magnet is set, permanent magnet produces the magnetic induction intensity of 35mT, and the direction in magnetic field is consistent with the direction of an electric field that is applied.
More than (1) and (2) two parts independently carry out respectively.
The present invention is owing to introduce magnetic field, and its efficiency of dust collection all is higher than the situation that does not have magnetic field far away, and efficiency of dust collection has probably improved about 4 times, under the situation in same introducing magnetic field, adds parallel magnetic field and is significantly improved than the purification efficiency that adds vertical magnetic field.
The present invention utilizes the control of dust power supply to produce anion, has reduced the clarifier volume, has saved cost.
Adopt spacing of needle and plate of the present invention, its purification efficiency is the highest after introducing magnetic field.
Description of drawings
Fig. 1 is pre-charged collecting electrode schematic diagram
Fig. 2 is the influences of different big or small magnetic fields to purification efficiency
Fig. 3 is the influence of magnetic direction to purification efficiency
Fig. 4 is a plasma discharge electrode schematic diagram
Fig. 5 is the movement locus of electronics in constant electromagnetic field of different initial velocity
Fig. 6 is efficient is removed in magnetic field to sulfur dioxide influence
Specific embodiment
Accompanying drawing is specific embodiments of the invention;
Below in conjunction with accompanying drawing content of the present invention is described in further detail:
(1) utilize ground, introducing magnetic field corona discharge plasma to remove airborne harmful suspended particulate:
With reference to shown in Figure 1, wherein, 1 is permanent magnet, and 2 is the high pressure collecting plate, and 3 is the ground connection collecting plate, and 4 is the anion spray point, and 5 is pre-charged control of dust spray point.Pre-charged collecting electrode is made of staggered stainless steel high pressure collecting plate 2 and ground connection collecting plate 3, the high pressure collecting plate 2 and the ground connection collecting plate 3 of interlayer are electrically connected, wherein be fixed with pre-charged spray point 5 on the side of a utmost point, every row 3-4 root, needle gage is 20mm, every pin 20mm is long, opposite side is fixed with anion spray point 4,6 of every rows, and needle gage is 10mm, every pin 20mm is long, and the spacing that high pressure collecting plate 2 and ground connection collecting plate are 3 is 1.5cm-2.0cm.Two ends at pre-charged collecting electrode apply high-voltage DC power supply, voltage at-6kV between-the 6.5kV.Permanent magnet 1 spacing that is provided with at the two ends of pre-charged collecting electrode is 4.5cm-6cm, and the coercivity of permanent magnet 1 is 600-900kA/m, and need make the magnetic direction of generation consistent with the electrostatic field direction that is applied.
Pre-charged control of dust utilizes needle electrode (spray point) to form non-uniform electric field, corona discharge takes place produce plasma, a large amount of electronics that wherein comprise and negative ions are under the effect of electric-force gradient, with airborne harmful particle generation inelastic collision, attached to top, make it to become charged particle, under the effect of extra electric field power, adsorbed by collecting plate.Its processing procedure is divided three phases [4]: (1) e+M (contaminant molecule) → M
-(2) M
-+ SP (harmful particle) → (SPM)
-(3) (SPM)
-→ SPM (being deposited on the collecting plate).
Particle is after charging area is charged, because the convection fan effect enters accumulation area.Charged particle with initial velocity is at electric field force (f
e=qE, f
e: electric field force; Q: particle electric weight; E: electric-field intensity.) act on down and being adsorbed by collecting plate, track becomes parabolic shape, and the part particle may be overflowed between collecting plate owing to initial velocity is excessive.As shown in Figure 1, after adding the Inbound magnetic field parallel (parallel magnetic field), also be subjected to Lorentz force (f by charged particle with electric field 3 of collecting plates
m=qv * B, f
m: Lorentz force; Q: particle electric weight; V: particle initial velocity; B: magnetic induction intensity.) effect, make particle that the trend of circular motion be arranged, circumferential plane is vertical with paper, circular motion radius r=mvsin θ/qB (r: circular motion radius; M: mass particle; V: particle initial velocity; θ: the angle of particle initial velocity direction and magnetic induction intensity direction; Q: particle electric weight; B: magnetic induction intensity.), f
eAnd f
mActing in conjunction makes the particle motion of spinning, helical axis is parallel to the direction of magnetic induction density B shown in Figure 1, and helicoid is perpendicular to paper, thereby has prolonged the time of particle in 3 stops of collecting plate, suppressed the effusion of particle from 3 of collecting plates effectively, purification efficiency is improved.
Add higher negative voltage on the anion spray point 4 of Fig. 1, voltage, makes it in aerial discharge between-the 6.5kV at-6kV, and air is dissociated into electronics, anion and cation.Because on the electrode be negative voltage, the electric field that produces in the space makes electronics and anion against electrode movement, to the space diffusion, attracts cation simultaneously, and electronics combines with the airborne gas molecule gas molecule that particularly electronegativity is stronger and forms electronegative particle.Just produce a large amount of electronegative particles by the negative electrode discharge like this, under the effect that adds wind-force, be diffused into the interior space, brought into play the effect that it purifies air.The present invention utilizes the control of dust power supply to produce anion, has reduced the clarifier volume, has saved cost.
With reference to shown in Figure 2, be of the influence of the big or small magnetic field of difference to purification efficiency, abscissa is the clarification time, ordinate CPM is pollutant relative mass concentration shown on the used air-borne dust instrument, and is linear with pollutant levels, is used for representing pollutant levels.Magnet pitch is big more, and the magnetic field that is added in accumulation area is more little.When permanent magnet 3 spacings were 4.5cm and 6cm, purification efficiency was than higher.
With reference to shown in Figure 3, be the influence of magnetic direction to purification efficiency, axis of ordinates is represented clarification time t among the figure
p, abscissa is represented different corona voltage U.Be respectively at discharge voltage-4500V ,-5000V ,-5500V and-situation of 6000V under, measured the clarification time when not adding magnetic field, add parallel magnetic field and adding vertical magnetic field, the altimeter of cylinder is shown in the purification process among the figure, and the shown CPM value of digital dust instrument drops to 300 o'clock used time from 2500.No matter be under the voltage of that grade, the efficiency of dust collection of introducing under the situation of magnetic field all is higher than the situation that does not have magnetic field far away, efficiency of dust collection has probably improved about 4 times, under the situation in same introducing magnetic field, adds parallel magnetic field and is significantly improved than the purification efficiency that adds vertical magnetic field.
(2) utilize the pulsed discharge plasma of introducing magnetic field to remove airborne pernicious gas:
With reference to shown in Figure 4,6 is the earthing pole of plasma discharge electrode, 7 is the high-pressure stage of plasma discharge electrode, 8 is the plasma discharge pin, and the low temperature plasma electrode is pin-plate electrode, is fixed with one of plasma discharge pin 8 and has 6 discharging acusectors on extremely, every row 3-4 root, needle gage is 17mm, and every pin 20mm is long, and the distance between pin-plate is 2cm-3cm.Apply the high voltage narrow pulse power supply at discharge of plasma in low temperature electrode two ends, pulse voltage is amplitude 20kV-22kV, and the rise time is 10 μ s, and pulse frequency is 100Hz.At discharge of plasma in low temperature electrode two ends permanent magnet 1 is set, the magnetic induction intensity that permanent magnet 1 produces about 35mT, and the direction in magnetic field is consistent with the direction of an electric field that is applied.
Will form corona discharge pulse under the precipitous high-voltage pulse effect of rising edge, certain space produces low temperature plasma around sparking electrode.On the one hand, in producing the process of low temperature plasma, the instantaneous high-energy that high-frequency discharge produces is enough to open the chemical bond of some pernicious gas molecule, makes it resolve into simple substance atom or harmless molecule.On the other hand, free groups such as N, the O of a large amount of strong oxidizing properties of meeting generation, OH in the low temperature plasma, the chemical reaction of its generation is as follows:
Thereby these free groups and pernicious gas generation chemical reaction are eliminated pernicious gas.
The present invention is incorporated into magnetic field in the low temperature plasma purifying harmful gas, and its influence mainly contains two aspects: at first, at the area of space near spray point, because electric-field intensity is very big, electronics just can obtain bigger energy on very short distance.When electron energy reaches excitation threshold, begin to take place inelastic collision.
With reference to shown in Figure 5, among the figure, ordinate is represented electronics motion distance in vertical direction, and abscissa is represented electronics motion distance in the horizontal direction, wherein
Among the figure
M is an electron mass, and e is an electron charge, and B is a magnetic induction intensity, and E is an electric-field intensity, v
0Be the electronics initial velocity.The electronics motion of in electromagnetic field, spinning, distance in the axial direction increases, and the holdup time is elongated.Therefore, the metastable state of this time space collision, excitation state collision, ionizing collision frequency are all many soon than no magnetic field, thereby energy will produce the free group of more removal pernicious gas in the unit interval, make that denitrification efficiency is very big must improve.
In addition, will be when pernicious gas enters low temperature plasma by the charged charged particle that becomes, under the acting in conjunction of electric field force and magnetic field force, the movement locus of charge particle also is complicated eddy flow track, its radius of gyration r is
V in the formula
⊥-Charged particle is perpendicular to the speed on the magnetic direction;
m
-The quality of charged particle;
q
-The charged particle electric weight;
B
-The magnetic field size.
This swirling motion of pernicious gas molecule makes them elongated in the time of plasma internal stops, thereby has prolonged the time that contacts with free group, makes pernicious gas fully to be purified.Therefore as long as introduce suitable magnetic field, removal efficient is improved.
With reference to shown in Figure 6, be the influence that efficient is removed to sulfur dioxide in magnetic field, abscissa is the removal time, ordinate is for removing efficient.Added the stationary magnetic field between sparking electrode, the direction in magnetic field is parallel with the spray point direction, and the magnetic induction density B size is 35mT.The peak value of pulse voltage is 20kV during experiment, and frequency is 100Hz, and the number of the spray point of sparking electrode is 4 rows, keeps magnetic field intensity constant in the spacing of needle and plate that changes sparking electrode.As can be seen from Figure 6, when spacing of needle and plate was 3cm, the removal behind the introducing magnetic field was most effective.
Concrete grammar is: (1) pre-charged collecting electrode is made of staggered stainless steel collecting plate, the high pressure collecting plate 2 and the ground connection collecting plate 3 of interlayer are electrically connected, wherein be fixed with pre-charged spray point 5 on the side of a utmost point, every row 3-4 root, needle gage is 20mm, every pin 20mm is long, opposite side is fixed with anion spray point 4,6 of every rows, and needle gage is 10mm, every pin 20mm is long, and the spacing that high pressure collecting plate 2 and ground connection collecting plate are 3 is 1.5cm-2.0cm; Two ends at pre-charged collecting electrode apply high-voltage DC power supply, voltage at-6kV between-the 6.5kV; At the two ends of pre-charged collecting electrode permanent magnet 1 is set, permanent magnet 1 spacing is 4.5cm-6cm, and the coercivity of permanent magnet 1 is 600-900kA/m, and need make the magnetic direction of generation consistent with the electrostatic field direction that is applied.
(2) the discharge of plasma in low temperature electrode is pin-plate electrode, be fixed with one of plasma discharge pin 8 and have 6 discharging acusectors on extremely, and every row 3-4 root, needle gage is 17mm, and every pin 20mm is long, and the distance between pin-plate is 2cm-3cm; Apply the high voltage narrow pulse power supply at discharge of plasma in low temperature electrode two ends, pulse voltage is amplitude 20kV-22kV, and the rise time is 10 μ s, and pulse frequency is 100Hz; At discharge of plasma in low temperature electrode two ends permanent magnet 1 is set, the magnetic induction intensity that permanent magnet 1 produces about 35mT, and the direction in magnetic field is consistent with the direction of an electric field that is applied.
Claims (1)
1, a kind of low temperature plasma indoor air purification method of introducing magnetic field is characterized in that, realizes by the following method:
(1) utilize the corona discharge plasma of introducing magnetic field to remove airborne harmful suspended particulate:
1) pre-charged collecting electrode is made of staggered stainless steel collecting plate, the collecting plate of interlayer is electrically connected, wherein be fixed with pre-charged spray point (5) on the side of ground connection collecting plate (3), every row 3-4 root, needle gage is 20mm, every pin 20mm is long, opposite side is fixed with anion spray point (4), 6 of every rows, and needle gage is 10mm, every pin 20mm is long, and the spacing between high pressure collecting plate (2) and ground connection collecting plate (3) is 1.5cm-2.0cm;
2) apply high-voltage DC power supply at the two ends of pre-charged collecting electrode, voltage at-6kV between-the 6.5kV;
3) permanent magnet (1) is set at the two ends of pre-charged collecting electrode, the permanent magnet spacing is 4.5cm-6cm, and the coercivity of permanent magnet is 600-900kA/m, and need make the magnetic direction of generation consistent with the electrostatic field direction that is applied;
(2) utilize the pulsed discharge plasma of introducing magnetic field to remove airborne pernicious gas:
1) the discharge of plasma in low temperature electrode is pin-plate electrode, be fixed with and have 6 discharging acusectors (8) on the high-pressure stage (7) of spray point, every row 3-4 root, needle gage is 17mm, every pin 20mm is long, and the distance between the high-pressure stage of discharge of plasma in low temperature electrode and the earthing pole (6) is 2cm-3cm;
2) discharge of plasma in low temperature electrode two ends apply the high voltage narrow pulse power supply, and pulse voltage is amplitude 20kV-22kV, and the rise time is 10 μ s, and pulse frequency is 100Hz;
3) at discharge of plasma in low temperature electrode two ends permanent magnet (1) is set, permanent magnet (1) produces the magnetic induction intensity of 35mT, and the direction in magnetic field is consistent with the direction of an electric field that is applied;
More than (1) and (2) two parts independently carry out respectively.
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| CNB2004100735733A CN1297338C (en) | 2004-12-31 | 2004-12-31 | Indoor air purifying method with introduced magnetic field |
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| CNB2004100735733A CN1297338C (en) | 2004-12-31 | 2004-12-31 | Indoor air purifying method with introduced magnetic field |
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| CN1297338C true CN1297338C (en) | 2007-01-31 |
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Cited By (1)
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|---|---|---|---|---|
| US8691360B2 (en) | 2001-12-13 | 2014-04-08 | Tac-Fast Georgia L.L.C. | Structures for creating spaces while installing anchor sheet and attachment piece subfloors |
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| CN103639043B (en) * | 2013-11-29 | 2015-12-16 | 山东大学 | A kind of synergistic fine particle removal method of many/power and device |
| CN105817321B (en) * | 2015-01-04 | 2018-03-02 | 中国科学院宁波材料技术与工程研究所 | Magnetic field auxiliary electrostatic formula oil fume purifier |
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| CN108626398B (en) * | 2018-06-08 | 2019-11-05 | 中国船舶重工集团公司第七一九研究所 | A kind of system that high pressure oil-containing gases leakage reclaiming clean recharges |
| CN109261354A (en) * | 2018-08-30 | 2019-01-25 | 东北师范大学 | Cylinder flue spiral outer rim under sensor is adjusted reinforces dust-extraction unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474547A (en) * | 1990-07-16 | 1992-03-09 | Aeria:Kk | Air cleaner |
| JPH11276842A (en) * | 1998-03-30 | 1999-10-12 | Toshiba Corp | Gas purification apparatus |
| US6224837B1 (en) * | 1997-10-31 | 2001-05-01 | Kabushiki Kaisha Toshiba | Exhaust gas processing apparatus |
-
2004
- 2004-12-31 CN CNB2004100735733A patent/CN1297338C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0474547A (en) * | 1990-07-16 | 1992-03-09 | Aeria:Kk | Air cleaner |
| US6224837B1 (en) * | 1997-10-31 | 2001-05-01 | Kabushiki Kaisha Toshiba | Exhaust gas processing apparatus |
| JPH11276842A (en) * | 1998-03-30 | 1999-10-12 | Toshiba Corp | Gas purification apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8691360B2 (en) | 2001-12-13 | 2014-04-08 | Tac-Fast Georgia L.L.C. | Structures for creating spaces while installing anchor sheet and attachment piece subfloors |
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| CN1672777A (en) | 2005-09-28 |
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