JP2003144979A - Corona discharge cyclone separation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dust collector of high processing speed, small size, and high processing capacity. SOLUTION: As illustrated in Fig. 1, a discharge port 7 is formed in the upper part face of a cylinder and a tapered lower part is made to be a recovery part 9 and a blowing port 8 is formed in the side face. Corona discharge electrodes 6 are installed in the inside at a prescribed constant distance. Ground voltage (0 V) is applied to the cyclone separation apparatus 4 from a d.c. high voltage power source. Minus d.c. high voltage is applied to the discharge electrodes 6. The discharge gas of roasting meat or an automobile is separated and dust-collected by a centrifugal force and an electrostatic attraction force in a dust collector.

Description

[Detailed Description of the Invention] [Field of Industrial Application] Decomposition and adsorption of smoke emitted from smoke emitting devices such as grilled meat and yakitori for business use, separation and recovery of oil from oil smoke, and deodorization. PM (carbon-containing particles), D contained in exhaust gas from automobiles, especially black smoke from diesel engines
Decomposition and recovery of oxidized substances such as EP (disel exhaust particulate) NOx and SOx. Decomposition and recovery of oxidized substances such as dioxins, NOx, and SOx contained in smoke from garbage incinerators and boilers. 2. Description of the Related Art At present, there is a catalyst filter system, a filter system, or a combination of a filter and a corona discharge. The conventional technology of using a filter or the like as an electrostatic precipitating electrode and combining it with a discharge wire to perform corona discharge and perform electric precipitating includes: 1) a method of passing air, etc. through a filter, and 2) a method of passing along a filter surface. There is a method of collecting electricity on the surface. In both cases 1 and 2, if the wind speed through which the air passes is high, the adsorption capacity is reduced, and if the filter becomes dirty, the capacity is reduced. If the speed of passing through the apparatus is increased in order to increase the processing capacity, the surface wind speed passing through the filter is increased and the efficiency is reduced. Therefore, in order to increase the processing capacity, in the case of 1, a device having a large filter surface is required. In the case of 2, it is necessary to increase the length of the passage surface of the electrostatic precipitating electrode serving as a filter. However, in reality, there is a disadvantage that the apparatus becomes large. At present, when a filter is installed in a diesel vehicle, the filter is clogged with PM in exhaust gas and cannot be used. Electrostatic dust collection by corona discharge is used in various fields because it surely captures fine particles of about 0.1 μ / m. However, the speed at which electrons pass through the dust collection surface is limited by the movement of electrons. If the speed (Coulomb force) is exceeded, the particles will flow at the wind speed and cannot be electrostatically attracted to the dust collecting surface. The only solution to this problem is to widen and lengthen the collecting electrode surface or reduce the wind speed. In order to solve this problem, the present invention provides a small-sized apparatus having a large processing capacity by increasing the processing speed by the following. Air containing particles such as smoke, dust, oily smoke, or exhaust gas from a vehicle is blown into the cyclone classification device "4" so as to generate a rotating swirling airflow along the inner surface of the device. The distance of the inner surface “12” of the cylinder which becomes the corona discharge collecting electrode plate by rotating and rotating is the diameter × 3.14.
X The number of rotations becomes substantially longer and a centrifugal force is applied to the particles. Cyclone classification device "4" The material is made of a material such as metal that conducts electricity, and it is used as a dust collecting electrode plate, and the ground (0V) from the DC high voltage power supply is connected.
6 "(hereinafter referred to as a discharge electrode" 6 "), and a DC high voltage (-) is applied thereto to apply an inner surface" 12 "to the discharge electrode"
In a space where a swirling airflow is generated between 6 ", a corona discharge is caused, particles are charged with electrons (-), and the particles are pseudo-negatively ionized. It is adsorbed on the cylinder inner surface “12” by the three synergistic effects of the substantial extension effect of the inner surface “12.” [Function] The function of the cyclone classification device is to remove dust, PM, etc. in the cylinder of the cyclone classification device “4”. When the air containing the particles is rotated at a high speed, the particles are separated and dropped by the centrifugal force due to the weight difference from the air to the lower recovery portion “9” of the cyclone, and the air is discharged from the upper exhaust port “7”. Smoke as small as about 1 micro / m, oily smoke, etc. cannot be separated.
In order to adsorb and remove this, cyclone classification device "4"
Smoke, oily smoke, PM blown in from "8"
The air containing particles such as is the inner surface of the cylinder of the anode (+) “12”.
In the process of turning around the inside of the cylinder (cyclone swirling air current phenomenon), the cathode (-) inside the cylinder inner surface "12" of the anode (+)
The electron (-) emitted from the discharge electrode "6" is charged and charged as a pseudo-negative ion. Particles are generated on the inner surface "12" of the anode (+) outside the cyclone by centrifugal force and electric dust collection. Adsorbed on the principle of. Compared with the conventional type electrostatic precipitating electrode, the cyclone type of the present invention has a cylindrical inner surface "12" serving as a precipitating electrode having a circumference of diameter x 3.14 and a circumference of this 3.times. It is several times to several tens times the length and area of the dust electrode. The oil and particles attached to the inner surface “12” of the anode (+) grow into large particles over time, separate from the inner surface “12” and fall to the lower portion “9” of the cyclone, and are collected. . In order to efficiently collect (adsorb) particles such as smoke, oil smoke, dust, PM, etc., electrons (-) may be supplied to more than the number of particles flowing into the cyclone. Increasing the supply of electrons (-) can be solved by increasing the effective length of the corona discharge wire or increasing the number of discharge needles. [Embodiment] A hood "1", which is a source of smoke, etc., is a blower
The suction side of 2 "is connected with a duct" 3 "or the like, and further connected to a blow-in port" 8 "on the side of a cyclone sorter" 4 "by a duct" 3 ". "Or connected to the suction side of the suction fan 2". In the case of a car, the exhaust port "7" is the exhaust port of the muffler to the atmosphere. For the cyclone classification device "4" made of metal or other electric conducting material Ground from DC high voltage power supply (0
V) is applied to keep a certain distance on the inner surface of the cylinder "12", a plurality of discharge electrodes "6" are provided, and a DC high voltage of the cathode (-) is applied. The same effect can be expected even if the discharge electrode "6" has a wire, a single wire, or a discharge needle. The applied voltage varies depending on the distance between the anode and the cathode and the shape of the electrode. The area of the cylinder inner surface "12" can be increased by forming a waveform. The dust collecting area can be increased by arranging a plate serving as another electrode plate in a strip shape with a slight distance inside the cylinder inner surface "12" along the cylinder inner surface "12". The dust collecting area can be increased even if a perforated plate or an open-cell sintered plate serving as another electrode plate is arranged on the inner surface of the cylinder "12" at a small distance along the inner surface of the cylinder "12". It is known that negative corona discharge produces ozone. When the distance between the discharge electrode of the cathode (-) and the counter electrode is short, the same voltage causes the phenomenon of "corrosion", and electrons from the cathode jump out toward the counter electrode. In this case, the electrons move at a high speed and dissociate molecules. And activates (radicals), the amount of converting oxygen to ozone increases. If NOx (NO. NO2) is present, NOx is dissociated and finally "N2". Decomposes into "O2" and renders it harmless. However, if the distance is slightly increased with the same voltage, the electrode becomes “glow corona” (film corona), and the discharge electrode “6” of the cathode protrudes all around (360 °) in the case of a wire or wire. As the electrons do not fly toward the surface, the speed of movement of the electrons is weakened and the amount of ozone is reduced, but it is advantageous for use in electrostatic precipitating because it diffuses in all directions of the discharge wire. Depending on the distance between the opposing electrodes, the electron (-) can be expected to have two functions: to effectively utilize the action of electron diffusion and decomposition (dissociation) of harmful molecules by generation and activation of ozone. By arranging a plurality of cathode (-) discharge electrodes "6" arranged a little apart from the inner surface "12" of the counter electrode, which is a counter electrode, a plurality of cathode (-) discharge electrodes "6" and electrons necessary for electric dust collection are arranged. -) Is diffused and supplied into the cyclone Preparative Preparative becomes possible decomposition of NOx and the like in the activation of deodorization and molecular by oxidizing the odor substances with ozone to generate ozone within the cyclone. Outlet "
Since the air exhausted from the outlet of the 7 "is free of oil, dust, etc., even if a deodorizing filter is provided in this area, the clogging is small, so that the air can be efficiently deodorized for a long period of time. By blowing ozone into the outlet or blowing port “8”, a deodorizing effect is obtained by the oxidizing power of ozone.The cyclone corona discharge particle classification apparatus of the present invention blows the first exhaust port “7” through the second machine. It is possible to further improve the effect by operating in connection with the mouth “8”.
Even if it is not a cyclone classification device with a narrowed lower part "4" but a simple cylindrical axial cyclone, the same effect can be obtained by performing corona discharge in a swirling airflow where centrifugal force acts. The classifier could not separate particles of about 0.1 micro / m or less such as smoke from air, but in the present invention, the smoke was electrically neutralized and annihilated, and oil particles from oil smoke, PM, DEP, NOx, SOx, etc. can also be separated and electroadsorbed. Since no filter was used, performance degradation due to filter contamination was eliminated. Since no filter is used, it is not necessary to increase the area of the filter in proportion to the amount of air to be sucked. Since the air containing particles rotates several tens of times in a cylinder due to the cyclone phenomenon, the adsorption distance is several tens times that of the conventional filter that passes over the surface of a filter or passes through a filter. Will have. In addition, since the effect increases as the blowing speed increases to a certain extent, the size can be simplified and reduced in size.

[Brief description of the drawings] FIG. 1 is a partial sectional view of a corona discharge cyclone classification device. [Explanation of symbols] 1, Hood installed at source of smoke 2. Suction blower fan 3, duct 4. Cyclone classification device 5, Negative electrode support connecting rod 6, Corona discharge electrode 7. Exhaust port 8. Inlet 9. Lower collection section 10. On the negative electrode support plate 11, under the negative electrode support plate 12. Inner surface of cylinder

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F01N 3/02 301 F01N 3/02 311Z 311 3/08 C 3/08 B03C 3/14 D

Claims (1)

Claims: 1. A cyclone classification device "4" for blowing dust-containing air or exhaust gas into a cylinder so as to generate a swirling airflow rotating along a cylinder inner surface "12". A corona discharge dust collecting electrode is formed by passing through the material, and a plurality of corona discharge electrodes "6" are arranged inside the corona discharge dust collecting electrode at a fixed distance. A ground (0 V) from a DC high-voltage power supply is applied to the cyclone classification device “4”. A negative voltage from a DC high-voltage power supply is applied to the corona discharge electrode “6” and the inner surface of the cylinder “12”
A corona discharge cyclone classification device for generating a corona discharge in a space where a swirling airflow is generated between a discharge electrode "6" and a discharge electrode "6".