Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Utility Patent
1998-06-26
2001-01-02
Mayekar, Kishor (Department: 3745)
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
C204S177000, C422S186040, C422S186300, C588S253000
Utility Patent
active
06168689
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method and an apparatus to clean exhaust gas conveying through the chamber, by burning up granular particles under plasma atmosphere, by removing chemical gaseous materials with negative ions, and by eliminating NOx with ultraviolet rays,
which are induced by high voltage electric field. Specifically, the present invention relates to a method and an apparatus which can clean exhaust gas and reduce noise, wherein the method comprises the step of burning up the granular particles with corona discharge after changing particles into plasma state, the step of eliminating NOx with ultraviolet rays, and the step of reducing noise.
The main cause of circumstance pollution are smoke and noise produced by industrial equipments and automobiles. Especially, diesel engines are popularly used, by virtue of their high power and low cost. By the way, in the event of using diesel engines, there occur some problems because diesel engines push out smoke including granular particles, hydrocarbons, NOx, noise and so on, which must be solved to prevent the circumstantial pollution. In order to solve these problems, intensive studies have been carried out about cleaning exhaust gas and reducing noise.
BACKGROUND OF ART
Heretofore known methods make use of catalytic filters, electric field and recombustion of exhaust gas.
In DE 3834920, the system has been described, wherein it burns up the deposited carbon particles in ceramic filter with ozone produced by electric field of 20 KHz and 20 MV.
In WO 9200442, method and device have been described, wherein exhaust gases are taken into a channel of ceramic body where an electric field is generated across the direction of flow, and the soot particles deposited on the walls of the channel are first negatively charged by a discharge electrode and then oxidized by ions adhering to oxygen.
In DE 3711312, the method and apparatus have been described, wherein particles are removed by being ionized with UV rays and by being collected to the plate.
In DE 3314168, the system have been described, wherein neutral particles are divided into two side streams which are directed over electrodes of large surface area, held at opposite potentials.
In U.S. Pat. No. 5,074,112, an apparatus has been described, wherein a filter disposed within the cavity removes particulate products of combustion from exhaust gases passing the cavity and electromagnetic waves produce heat for incinerating particulate products of combustion.
As described above, conventional methods can be applied to eliminate only a kind of soot particle, and so the other ingredients including NOx and noise are pushed out without eliminating.
Accordingly, the inventors of the present invention invented a method and apparatus for cleaning exhaust gas as well as reducing engine noise.
SUMMARY OF THE INVENTION
An object of this invention is to provide a method and an apparatus for cleaning exhaust gas pushed out from engines or industrial equipments and reduce engine noise.
Specially, the object of the present invention is to provide method and apparatus which can clean exhaust gas and reduce engine noise, by partitioning the granular particles and noxious materials in exhaust gas, and then by burning up directly the granular particles under plasma atmosphere, by burning up again the minute particles by means of DC high voltage and AC high voltage, by removing noxious materials with negative ions, by removing NOx by oxidizing it into NO
3
with ultraviolet rays and ozone, which can be easily dissolved in water which is produced by Sellen's effect of PN diode in this apparatus, and by cutting off engine noise and electromagnetic interference.
The apparatus in the present invention is divided into seven units in order to enhance productivity and efficiency of after-service, which can be used in combination or in separately according to the kind of exhaust gas since it has an exhaust gas reducing effect in each unit.
In this invention, a partition unit renders exhaust gas to pass through at high speed and burns up particles which have been collected the partition unit.
In the partition unit, to pass exhaust gas at high speed, EHD(electro-hydro dynamics) method and electrostatic method are applied at a bottle necked nozzle to accelerate the flow of exhaust gas.
The negatively charged particles accelerate much more by voltage difference between an ion pin and attractor electrode, and therefore staying or slowing down of exhaust gas in a chamber is prevented.
The negatively charged particles are attracted by electrostatic force on the collector electrode which is made of a metal mesh and particles which can not pass through the collector electrode of a metal mesh drop down into the manhole where one set of discharge poles is disposed to burn up large particles.
In plasma unit, particles passed through collector electrode are burned by using corona process, wherein small particles are burned by streamer corona generated between a plasma unit pole and mesh. In order to clean exhaust gas more efficiently, exhaust gas is conveyed to electron unit after passing through the plasma unit. Electron unit burns up minute particles by means of DC high voltage and AC high voltage. AC high voltage is applied across a pole plate and hole plate in order to generate streamer corona to burn up minute particles.
DC high voltage is applied across the hole plate and ion pin which pushes particles to the hole plate in order to enhance the efficiency of corona discharge between the hole plate and pole plate.
By the above-mentioned process, granular ingredients of exhaust gas are nearly cleared.
Also, there are noxious chemical materials including NOx in exhaust gas, which are removed with negative ions generated by ionization unit which generates UV rays between plasma jet and opposite electrode, and this UV rays generate a great deal of negative ions. Noxious materials combine with negative ions and ozones to be changed into other materials.
In order to remove NOx which is not removed in the above-mentioned ionization unit, a screen unit is used.
The screen unit comprises a first ceramic plate, and second ceramic plate having hexagonal holes in which PN diodes are disposed.
By action of 10K voltage applied across the plates, UV rays are generated around hexagonal hole in a large amount, and these UV rays let O
2
to be changed into ozone. In addition, PN diodes cause temperature dropping by Sellen's effect to condense gaseous H
2
O into water. During above process, the efficiency of removing NOx will be enhanced by taking air into plates.
This invention can contain a union unit, which absorbs engine noise and shields electromagnetic wave to be radiated by high frequency. Union unit is used to meet the regulations of EMI, EMC specification of this inventive apparatus.
According to the above, this invention can clear exhaust gas and can be substituted for a noise absorber.
REFERENCES:
patent: 4871515 (1989-10-01), Reichle et al.
patent: 1224639 (1971-10-01), None
patent: 2287630 (1995-09-01), None
Lee Yong-hee
Park Chan-ho
Dilworth & Barrese
Mayekar Kishor
Seondo Electric Co., Ltd.
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