JP2001246289A - Electric dust collector with two porous metal electrodes so disposed as to shut off inflow air having discharge wire wired thereon for applying charge to centers of two porous electrodes, and oil mist collector emitting negative electron discharged from discharge wires onto plasma area and provided with oxidization deodorizing function utilizing acceleration of decomposition of active oxygen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil mist collector having two porous metal electrodes classified each other with a discharge wire as their center, improving the dust collecting efficiency by the electric dust collecting force and the impact separating action, simultaneously forming oxygen radicals by emitting free electron discharged from a the discharge wire into a plasma area on the rear to form oxygen radical, and utilizing its strong oxidizing force to deodorize an odorous component. SOLUTION: Two porous metal bodies are so inserted as to shut off a flow path for the purpose of removing rough oil mist in the foregoing stage, and then an electric dust collecting section formed of two porous metal electrodes classified each other with the discharge wire as its center is provided, and low temperature weak ionization plasma generating bodies are disposed on the upper and lower parts of the rear section of the electric dust collecting section, and a catalyst is disposed as the final stage, and the functions capable of removing the oil mist, efficiently removing dust and also of deodorization in a series of flows as described above are incorporated in thus electric dust collector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention improves the contact efficiency between charged particles and an electrode by providing two porous metal dust collecting electrodes arranged so as to block inflow air. The present invention relates to an oil mist collector having a function of deodorizing by improving the dust collecting force by taking into account the collision separation effect caused by the quality of the material and by the oxidizing power of plasma and catalyst.

[0002]

2. Description of the Related Art A general oil mist removing device includes a device incorporating a collision separation function as a physical action and a method of incorporating and removing an electric dust collector known as a known fact. As a countermeasure against deodorization, a method has been adopted in which activated carbon is incorporated and a deodorizing effect by a physical adsorption method is expected.

[0003]

Among them, in the collision separation system, only the oil mist of 1 .mu.m or more is difficult to catch because of the mere physical dust removal. In addition, if the pores on the trapping surface are made smaller, the adsorption life is shortened with a pressure loss, and the efficiency becomes inefficient.

[0004] Further, in the electrostatic precipitating method, it is said that it is possible to capture particles up to a particle size of up to 0.001 µm by the principle of electrostatic adsorption. In the case of the electrostatic precipitating electrode structure,
It is difficult to adsorb and remove the oil mist sufficiently, and the trapping ability decreases with time.

[0005] Regardless of the collision separation method or the electric dust collection method,
In both types, there is no ability to remove fine oil mist flowing in as oily smoke, and further, there is no ability to deodorize odors associated with them and other odor components.

[0006] In order to improve the odor, there is a device that introduces the inflow air to an activated carbon tank and uses a physical adsorption of activated carbon to aim at a deodorizing effect. However, the inflowing oil mist is mixed with moisture and carbon black. Since it is formed, the fine pores, which are the adsorption surface of the activated carbon, are covered with moisture and oily components, which causes a problem before the function is sufficiently exhibited. Also, due to the nature of activated carbon, there are components that cannot be expected to have any deodorizing effect depending on the types of odor components, and the use of activated carbon for the purpose of deodorizing raises doubts about the situation.

On the other hand, the present inventor employs a porous metal in consideration of the collision separation function as an electrode, and inserts two electrodes in a form that shuts off inflow air, unlike the conventional method of mounting an electrostatic precipitating electrode. In addition, we developed a dust collection electrode composed of two electrodes sandwiching a discharge wire, and established a high dust collection efficiency and high dust collection method that simultaneously exerts the collision separation function and the electric dust collection function. In addition, negative free electrons emitted from the discharge line are irradiated to the plasma region to promote the decomposition of active oxygen while simultaneously adsorbing odor components and active oxygen to the normal temperature catalyst, and oxidizing power of the catalyst by the oxidizing power of active oxygen. It promoted and decomposed even hardly decomposable components into substances that were almost completely decomposed, and established it as a device that not only collects dust but also has a practical deodorizing function.

[Means for Solving the Problems]

In order to solve the above-mentioned problem, a grease filter made of a porous metal, which is known as a known fact, is provided on the suction side to remove coarse oil mist of 1 μ or more in advance, and a grease filter is provided behind the grease filter. An electric precipitator in which a discharge wire is formed between two metal porous precipitating electrodes and two metal porous precipitating electrodes so as to block air, and further behind it A low-temperature weakly ionized plasma generator with a structure to which oil and fat components are difficult to adhere is arranged, a catalyst is inserted at the end, and an oil mist separator is configured as a unit in a series of flows. It is a feature.

According to the first aspect of the present invention, two dust collecting electrodes formed of a porous metal are arranged so as to block an air inflow path, and a gap between the two dust collecting electrodes is divided into equal distances. In addition, a discharge wire for adding an electric charge is stretched to form an electrostatic precipitator. By arranging the dust collecting electrode so as to block the air inflow path, oil mist contained in the inflowing air and passing through the inside of the dust collecting electrode, and other contained particles, i.e., dust, contact the dust collecting electrode most efficiently. In addition to the Coulomb force based on the principle of electric dust collection, it is possible to cause a physical adsorption force to act.

According to the above configuration, the oil mist and dust pass through the first dust collection electrode made of a porous metal and are subjected to an impact separation action due to the nature of the porous metal. The air flow that passes through the filter fibrous tissue, which is a characteristic of the porous metal material, passes through the compression, expansion, and collision actions randomly and repeatedly. Causes physical attachment to quality tissue and is taken up and removed.

According to the first aspect of the present invention, when passing through the first dust collecting electrode, the fine oil is supplied in a state where the load is reduced due to physical adhesion to a considerable extent, and is irradiated with electrons from a discharge line. Mist and dust are given a negative charge.

[0012] According to the above configuration, the dust collection electrode composed of two metal porous bodies is configured so as to block the inflow air before and after the discharge wire, so that the oil mist provided with the negative charge is provided. And dust, due to the mass transfer force, or Coulomb force,
It is attracted to the front and rear metal dust collection electrodes. In this case, a mass transfer force higher than the flow velocity must be added to the oil mist and dust. However, it is possible to increase the mass transfer force by widening the passage area and reducing the surface wind speed. If the mass transfer force exceeds the flow velocity, it will electrostatically adhere to the back surface of the dust collecting electrode on the inflow side and the opposite dust collection electrode surface on the inflow / outflow side against the flow velocity. Further, on the opposite side of the dust collecting electrode on the inflow / outlet side, a physical adsorption action is also generated, similar to the dust collection electrode on the inflow side, and this leads to more efficient adsorption and removal action.

By making effective use of the above-mentioned phenomenon, not only the electrostatic attraction force in the electrostatic precipitator but also the physical adsorption action can be utilized by forming the dust collecting electrode with a metal porous material.
A finer oil mist and dust are trapped by the synergistic effect of electrostatic adsorption and physical adsorption, and higher dust collection efficiency can be expected than by the sole action of electric dust collection.

According to a second aspect of the present invention, the plasma region is irradiated with the emission of free electrons by the discharge line according to the first aspect, whereby the electrons are reduced to various active oxygens generated in the plasma region, and oxidative decomposition is performed. It is designed to promote power. Since various types of active oxygen (including ozone) generated in the plasma region proceed in a stepwise oxidative decomposition reaction, the oxidizing power of the active oxygen here is weak and the reaction rate is slow.
However, when electrons are given and reduced, the oxidative decomposition reaction of active oxygen is promoted, and a stronger oxidizing power and a higher reaction rate can be expected.

In order to effectively utilize the above phenomenon, free electrons emitted by a discharge line must be effectively irradiated to the plasma region. However, if a dust collection electrode made of a porous metal is disposed behind the discharge line, In addition, the free electrons that have been released are neutralized on the dust collecting electrode, which leads to the inability to reach the plasma region.

However, in the dust collecting electrode formed of a porous metal disposed on the inflow / outlet side, since the ion wind is generated by the flow velocity and the mass transfer force, the flow velocity is slightly faster than the original flow velocity by the addition of the ion wind. Some free electrons pass through the dust collection electrode formed of porous metal and reach the plasma region.

In order to effectively use the above phenomenon, if a structure is adopted in which a low-temperature weakly ionized plasma generator is arranged behind a dust collecting electrode formed of a porous metal disposed on the inflow / outlet side, free electrons are generated in the plasma region. Can be contacted more effectively.

By doing so, the various active oxygens generated in the plasma region are efficiently contacted with the free electrons emitted from the discharge line, the active oxygen is reduced by the free electrons, and the oxidative decomposition reaction of the active oxygen is reduced. Speed increases. In addition, since the oxygen radicals are converted into stronger oxygen radicals, the decomposition and deodorization power accompanying the oxygen radicals is also improved, which leads to the fact that the hardly decomposable components can be completely decomposed.

The invention according to claim 3 relates to the shape and specifications of the low-temperature weakly ionized plasma generator according to claim 2. No matter how sophisticated the dust collection mechanism is incorporated, it is almost impossible to completely capture oil mist and dust, and some leakage will necessarily occur.However, if a low-temperature weakly ionized plasma generator is incorporated in the same series, Oil mist and dust leakage may adhere to the surface of the low-temperature weakly-ionized plasma generator, leading to a discharge failure or a fire. To achieve this, the distance between the applied electrode of the low-temperature weakly ionized plasma generator and the dielectric electrode is increased, and the dielectric itself covering the electrode material is made as thin as possible to maintain the discharge temperature at room temperature. And the discharge energy must be set low.

In order to form the above structure, a discharge electrode and a dielectric electrode made by sintering dielectric glass as thin as possible on the surface of a tungsten electrode are made, and they are inserted into insulators having holes at appropriate intervals from the left and right. Then, a low-temperature weakly ionized plasma generator is manufactured.

By doing so, it is possible to set the discharge energy low and to suppress the generation of heat energy due to the discharge. In addition, an appropriate distance between the discharge electrode and the dielectric electrode suppresses particles adhering to the discharge electrode surface and the dielectric electrode surface, and also contributes to the dissipation of heat energy accompanying the discharge.

According to a fourth aspect of the present invention, various active oxygens generated by the low-temperature weakly ionized plasma generator according to the third aspect and intermediate products decomposed by oxygen radicals reduced by irradiation with free electrons are efficiently used. An object of the present invention is to allow the catalyst to be well adsorbed to a room temperature catalyst, to promote the oxidizing power of the room temperature catalyst by the oxidizing power of various active oxygens, and to decompose and deodorize more efficiently.

In order to effectively utilize the above phenomenon, it is important to efficiently adsorb the odor components and the intermediates of some odor components which have started to react with active oxygen and oxygen radicals on the surface of the room temperature catalyst. Therefore, it is necessary to incorporate a mechanism for increasing the catalyst adsorption efficiency into the catalyst storage unit.

Therefore, as a factor considered to increase the adsorption efficiency, it is necessary to reduce the flow rate passing through the catalyst, that is, the passing velocity LV value, and to take the contact time between the catalyst and the odor component contained in the passing air. However, when the contact time is taken, the pressure loss increases, the static pressure in the device increases, and the energy consumption increases as the fan capacity increases. That translates into running costs and is an inefficient device.

In order to minimize the factors that adversely affect the apparatus, the room temperature catalyst is made into a honeycomb structure to minimize the pressure loss, and in order to further increase the contact time, a felt in which activated charcoal is electrically implanted with activated carbon in a urethane porous material is used. By sandwiching the deodorizing sheet of the type, a structure is formed in which the contact time of the odor in contact with the catalyst is increased without losing much pressure.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a schematic diagram of a dust collecting portion of an oil mist collector according to the present invention, FIG. 2 is an operation form diagram illustrating a dust collecting mechanism thereof, FIG. 3 is a schematic diagram of an electrode used, and FIG. FIG. 5 is a schematic view of the embodiment.

First, the outline of the dust collecting portion of the oil mist collector shown in FIG. 1 will be described. In the dust collection unit 1 of the oil mist collector, two metal porous filters 4-1 and 4-2 (same shape) serving as a grease filter are arranged at equal intervals a, and the captured oil mist is disposed on the bottom surface thereof. A drain discharge groove 2 having a gradient so as to be efficiently discharged out of the apparatus and a drain port 3 provided in the center. Next, a dust collecting electrode 5-1 formed of a metal porous material, and a discharge wire 6 for discharging a negative charge is provided behind the dust collecting electrode 5-1 in parallel with the dust collecting electrode 5-1. A porous dust collecting electrode 5-2 is provided. Also, the dust collecting electrode 5-1 and the dust collecting electrode 5
-2 are completely the same, and are equally spaced b around the discharge wire 6.
Separated by. Subsequently, on the upper and lower surfaces behind the dust collecting electrode 5-2, the low-temperature weakly ionized plasma discharge body 7-1 having the same shape is formed so that free electrons transmitted from the dust collecting electrode 5-2 are likely to collide.
And 7-2 are attached. Further, catalysts 8-1 and 8-2 that end a series of steps are arranged at a fixed interval c. The catalysts 8-1 and 8-2 have the same quality and the same shape.

Next, the operation of the dust collecting portion of the oil mist collector will be described. As can be seen from the operation form diagram of FIG. 2, air a-1 containing oil mist and dust.
Collides with the metal porous filter 4-1 which is the first obstacle, receives the collision separation action b-1, and is captured so as to be enveloped in the metal porous filter 4-1.

Further, the oil mist captured so as to be wrapped is agglomerated inside the metal porous filter 4-1, falls as an oil pick c, flows along the drain discharge groove 2, and flows into the drain port 3. Is efficiently discharged out of the apparatus.

Further, a metal porous filter 4-2 having the same shape and the same shape is provided behind the metal porous filter 4-1 at the same interval d. The metal porous filter 4-2 also exerts the same function as the metal porous filter 4-1. However, the metal porous filters 4-1 and 4-2
Since there is an interval d that separates each other, the inflow air a-2 that has passed through the metal porous filter 4-1 is subjected to an expansion action, the wind speed is once reduced, and then the next metal porous filter 4
-2, so that it receives the collision separation action b-2 of the metal porous filter 4-1 or more. By doing so, it is possible to capture an oil mist having a smaller diameter than the oil mist captured by the metal porous filter 4-1.

Subsequently, fine oil mist or dust-containing air a of 1 μm or less passing through the metal porous filter 4-2.
-3 are distributed at the same interval e around the discharge line 6,
It is blocked by the metal porous dust collecting electrode 5-1 on the inflow side and collides. At that time, since the metal porous filter 4-2 and the metal porous dust collecting electrode 5-1 are manufactured in the same shape and the same shape, after being subjected to the same collision separating action b-3 as in the previous stage, there is a certain point. The object is a collision separation action b-3 of the metal porous dust collection electrode 5-1.
Will be captured.

However, fine oil mist or dust-containing air a-4 of 1 μm or less escapes trapping in the collision separation operation, passes through the metal porous dust collecting electrode 5-1 and is free to be discharged by the discharge wire 6. Electrons (e ⁻ ) are charged by the attachment of the electrons (e ⁻ ) to form negatively charged particles a-5. The particles a-5 ride on the generated ionic wind and are distributed to the metal porous dust collection electrode 5-1 and the metal porous collection electrode 5-1 at the rear. It is attracted to the dust electrode 5-2 by Coulomb force and is adsorbed and removed. This adsorption phenomenon is an electric dust collection technology known as a known fact, and the trapping ability is 0.001.
It is hard to imagine that we can capture enough up to μ.

However, in the present apparatus, the dust collecting electrode is not arranged along the inflow air as seen in a general electric dust collecting apparatus. A metal porous dust collecting electrode 5-1 having a sufficient opening area and a metal porous dust collecting electrode 5-
2 is inserted into the inflowing air in the same manner as the filter to cut off the flow path. Is added, and more effective dust collection efficiency can be expected.

The reason why the metal porous dust collecting electrode 5-1 located on the inflow path side can capture particles in accordance with the law of electric dust collection is as follows.
If it is slower than the moving speed of the particles a-5 charged by the above, the particles are attracted to the metal porous dust collection electrode 5-1. However, on the other hand, the metal porous dust collection electrode 5
In the case of -2, the surface wind speed of the inflow air a-4 and the moving speed of the charged particles a-5 are synergistic, which may be a factor of reducing the adsorption capacity.

However, even if the performance of the metal porous dust collecting electrode 5-2 is reduced, the metal porous dust collecting electrode 5-2 is not separated from the metal porous dust collecting electrode 5-1 by collision separation. It does not matter at all because it is affected.

At this time, most of the oil mist and dust can be captured and removed, but the odor component and other molecular components and the particles having a particle size of 0.001 μm or less, and the metal porous dust collecting electrode 5
Part of the free electrons that escaped the electrical neutralizing action at -2 pass through the metal porous dust collection electrode 5-2.

In order to effectively use a part of the free electrons that have passed, low-temperature weakly-ionized plasma generators 7-1 and 7-2 are arranged at the upper and lower portions behind the metal porous dust collection electrode 5-2. By doing so, effective free electrons are brought into contact with various active oxygens (including ozone) generated by the low-temperature weakly ionized plasma generators 7-1 and 7-2, and various active oxygens are reduced. Thus, it can be converted into oxygen radicals having higher oxidizing power.

The converted oxygen radicals collide with odor components and are deodorized by an oxidative decomposition reaction. However, some of the hardly decomposable components flow out as a reaction intermediate or as it is.

The reaction intermediates flowing out in the preceding step and the odor components which have escaped the collision of oxygen radicals, together with the active oxygen and oxygen radicals generated one after another, form the low-temperature weakly ionized plasma generators 7-1 and 7-2. It is sent to the catalyst 8-1 provided behind and is adsorbed on the surface of the catalyst 8-1.

The adsorbed odorous component is promoted by the oxidizing power of the catalyst 8-1 and the oxidizing power of active oxygen and oxygen radicals, and takes time to reach an odorless component and complete decomposition.

Further, behind the catalyst 8-1, the catalyst 8-1
The catalyst 8-2 having the same shape and the same shape as the above is arranged at an appropriate interval f. With the decrease, a structure convenient for adsorbing a very small amount of odor components reaching the surface of the catalyst 8-2 is formed.

Each oil mist collector employs a general electric dust collecting method, and is a device which only incorporates activated carbon for deodorization. The synergistic effect of the electric dust collecting function and the collision separating action as in a metal porous dust collecting electrode. There is no device that can use the to perform an efficient dust collection function. In addition, plasma is irradiated with free electrons to convert various active oxygens into stronger oxygen radicals,
There is no oil mist collector that incorporates a device that decomposes and deodorizes with its oxidizing power. In order to overcome severe conditions such as oil mist and perform high dust collection performance and reliable deodorizing treatment, an oil mist collector other than the present invention cannot solve the problem.

[Brief description of the drawings]

FIG. 1 is a schematic view of a dust collecting section according to the first, second and fourth embodiments of the present invention.

FIG. 2 is an operation diagram illustrating a dust collecting mechanism according to the first, second, and fourth embodiments of the present invention.

FIG. 3 is a schematic view of a low-temperature weakly ionized plasma generator according to the third embodiment of the present invention.

FIG. 4 is a schematic view of a catalyst used in the present invention.

FIG. 5 is an embodiment diagram of an example of the present invention.

[Explanation of symbols]

Fig. 1 1 Dust collection unit 2 Drain discharge groove 3 Drain port 4-1 Metal porous filter 4-2 Metal porous filter 5-1 Metal porous dust collection electrode 5-2 Metal porous dust collection electrode 6 Discharge wire 7- DESCRIPTION OF SYMBOLS 1 Low temperature weak ionization plasma generator 7-2 Low temperature weak ionization plasma generator 8-1 Catalyst 8-2 Catalyst a Equal interval b Equal interval c Constant interval Fig. 2 1 Dust collection unit 2 Drain discharge groove 3 Drain port 4-1 Metal Porous filter 4-2 Metal porous filter 5-1 Metal porous dust collecting electrode 5-2 Metal porous dust collecting electrode 6 Discharge line 7-1 Low temperature weakly ionized plasma generator 7-2 Low temperature weakly ionized plasma generator 8 -1 Catalyst 8-2 Catalyst a-1 Air containing oil mist and dust a-2 Inflow air a-3 Oil mist and dust containing air a-4 Oil mist and dust containing air a-5 Negatively charged particles b-1 Collision Separation Action b-2 Collision Separation Action b-3 Collision Separation Action c Oiling d Same spacing e Same spacing f Appropriate spacing Figure 3 1 Tungsten wire 2 Glass sintered dielectric 3 Glass sintered dielectric coated electrode Reference Signs List 4 Insulator 5 Discharge gap 6 Applied electrode (dielectric electrode) 7 Dielectric electrode (applied electrode) a Appropriate interval Fig. 4 1 Activated carbon-supported porous filter 2 MnO ₂ room temperature catalyst 3 Frame Fig. 5 1 Oil mist collector body cover 2 Oil mist Collector body 3 Drain discharge groove 4 Drain port 5-1 No. 1 metal porous filter 5-2 No. 1 2 Metal porous filter 6 Discharge wire 7-1 No. No. 1 metal porous dust collecting electrode 7-2 No. 2 metal porous dust collecting electrode 8-1 No. No. 1 low temperature weakly ionized plasma generator 8-2 No. 2 Low temperature weakly ionized plasma generator 9 Oil mist collector power supply 10-1 No. No. 1 catalyst unit 10-2 No. 2 Catalyst unit 11 Inlet flange 12 Outlet flange 13 Inspection door

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01J 19/08 B03C 3/00 G B03C 3/00 3/02 B 3/02 3/41 A 3/155 3/45 Z 3/41 H05H 1/24 3/45 B01D 53/36 H // H05H 1/24 B03C 3/14 A F term (reference) 4C080 AA05 AA07 BB02 CC02 CC12 HH05 JJ03 JJ06 KK08 LL10 MM02 MM05 NN01 NN28 QQ11 4D048 AA22 AA24 AB01 AB03 BA28X BB07 CC25 CD01 EA03 4D054 AA09 AA13 BA01 BA19 BB02 BC03 EA01 EA27 EA30 4G075 AA03 AA37 BA06 BA08 BD12 CA47 CA54 EB42 (54) An electrostatic precipitator with a discharge wire that spreads the charge at the center of the two metal porous electrodes, and a negative electron emitted from the discharge wire illuminating the plasma region And oil mist collector provided with the oxide deodorizing function using accelerated degradation of the active oxygen.

Claims (4)

[Claims] 1. An oil mist in which a dust collecting electrode is formed of porous metal, two metal porous electrodes are arranged so as to block air passing therethrough, and a discharge wire for giving a charge is provided between the two electrodes. collector. 2. A plasma region formed by a plasma generator is irradiated with negative free electrons emitted from a discharge line to promote the decomposition of various active oxygens generated in the plasma region, and to oxidize and decompose odor components. Oil mist collector that incorporates the function of decomposing and deodorizing quickly. 3. It is difficult to remove 100% of the dust collection performance. In order to prevent the leaked oily mist from adhering to the plasma discharge body and hindering discharge or causing a fire, discharge heat is prevented. Oil mist collector with a deodorizing function using a low-temperature weakly ionized plasma discharge body manufactured in a shape that keeps the temperature at room temperature and inhibits adhesion. 4. A method for irradiating various types of active oxygen generated by plasma with negative free electrons to accelerate the decomposition of active oxygen, and to efficiently attach intermediate products and active oxygen during decomposition to the catalyst surface. An oil mist collector that adds higher deodorization performance due to the synergistic effect of the oxidizing power of the catalyst and the oxidizing power of active oxygen.