JP3369454B2 - Purification device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a purifying device,
More specifically, the present invention relates to a purification device that is preferably used for treating gas discharged from a municipal solid waste treatment plant or the like.

[0002]

2. Description of the Related Art Municipal solid waste crushing and sorting plant and RD
In an urban waste treatment plant such as an F plant, a deodorizing device, which is a purifying device, is installed so as to prevent the odor generated from the waste from being discharged outside the plant. The conventional deodorizing device is an adsorption type deodorizing device which is mainly adsorbed by activated carbon, and exhaust gas containing odor is guided to the adsorption type deodorizing device to adsorb the odor to the activated carbon for deodorization.

[0003]

However, in the prior art, when the amount of activated carbon in the adsorption type deodorizing device reaches the saturated adsorption amount, the activated carbon must be regenerated or replaced, and the amount of the activated carbon to be filled and used. If the amount of activated carbon is large, the device can withstand long-term use, but the device becomes large and the equipment cost increases, and if the amount of activated carbon is small, the device can be downsized. There is a problem that the period becomes short, activated carbon must be frequently regenerated or replaced, and maintenance is time-consuming.

[0004] While the off-gas from municipal waste incineration plants contains harmful components such as hydrogen chloride, NO _X, SO _X and dioxins, removing the harmful components from the exhaust gas by the deodorizing device However, there is a problem in that a device for removing the harmful components is additionally required, which complicates the configuration of the equipment.

An object of the present invention is to provide a purifying device which requires no troublesome maintenance and can be simplified in construction.

[0006]

According to the present invention, a gas containing dust such as soot dust is supplied, and dust collecting means for collecting and removing dust from the gas, and gas from which the dust is removed are supplied. Plasma generating means for generating non-equilibrium plasma by discharge between the discharge electrode and the ground electrode, the discharge electrode is made of a linear body, the ground electrode extends along the axis of the discharge electrode, The purification device is characterized by being formed in a spiral shape having a substantially constant inner diameter as a center. Further, the present invention is provided with a gas containing dust such as soot dust, dust collecting means for collecting and removing the dust from the gas, and a gas from which the dust has been removed to supply the discharge between the discharge electrode and the ground electrode. Plasma generating means for generating non-equilibrium plasma by means of which the discharge electrode comprises a linear body, the ground electrode extends along the axis of the discharge electrode, and has a substantially constant inner diameter about the discharge electrode. A plurality of ring-shaped bodies that are formed in a ring shape and that are arranged at substantially constant intervals p2 along the axis of the discharge electrode, and that are fixed to the outer peripheral portion of each ring-shaped body. It is a purification device comprising a plurality of holding members for holding a space p2.

According to the present invention, the dust collecting means collects and removes dust from gas containing dust such as soot, for example, air containing dust such as soot and odorous components and harmful components, and the plasma collecting means removes the dust. Since only the gas from which dust has been removed is supplied, the plasma generated by the discharge can decompose and remove the odorous components and harmful components in the gas from which dust has been removed. The maintenance work of the purifying device can be facilitated with a simple structure without any trouble.

[0008]

According to the invention, the plasma generating means ionizes the gas between the discharge electrode and the ground electrode into electrons and ions by discharge, and the electrons are separated from each other in a state where the electron temperature of the electrons is higher than the ion temperature of the ions. Since non-equilibrium plasma, which is a plasma that is not thermodynamically balanced with ions, is generated, high-speed electrons are generated while the temperature of the gas in the plasma atmosphere between the electrodes generated by the discharge is kept at room temperature. Can be obtained by colliding these high-speed electrons with odorous components and harmful components in the gas from which dust has been removed,
It is possible to generate a highly reactive chemically active species and cause a chemical reaction to remove odorous components and harmful components in the gas. Also, since the temperature of the gas in the plasma atmosphere between the electrodes generated by the discharge is kept at room temperature,
It is not necessary to provide cooling means or the like in the plasma generating means.
Further, the temperature of the gas discharged from the plasma generating means is also kept at room temperature, high temperature gas is not discharged unlike the case of using thermal plasma, and it is not necessary to provide a cooling means for the discharged gas. The configuration can be simplified. According to the invention, the ground electrode extends along the axis of the discharge electrode and is formed in a spiral shape or a ring shape having a substantially constant inner diameter with the discharge electrode as a center. Can be kept constant, and the discharge distance can be kept with high accuracy.
In addition, the ground electrode is easy to manufacture, and the discharge region between the discharge electrode and the ground electrode where high-speed electrons are obtained is formed in a spiral shape or a ring shape. Therefore, the gas containing the odorous component and the harmful component from which dust has been removed can be reliably treated by passing the gas in either the axial direction of the earth electrode or the direction intersecting the axial direction. At the same time, the surface area of the ground electrode can be made smaller than the surface area of the ground electrode of the same size formed in a cylindrical shape, for example. As a result, the capacitance between the discharge electrode and the ground electrode can be reduced, the time required to reach the discharge potential can be shortened, non-equilibrium plasma can be easily generated, and high-speed electrons can be obtained.

[0010]

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

In the present invention, the dust collecting means is a bag filter surrounding the earth electrode.

According to the invention, since the dust collecting means is a bag filter which surrounds the earth electrode, a gas containing dust such as soot is guided to the bag filter from around the bag filter, and the bag filter causes soot and so on. Of the dust, and guides the gas from which the dust has been removed to the space between the discharge electrode and the ground electrode, and the odorous components in the gas from which the dust has been removed by the plasma generated between the discharge electrode and the ground electrode. It can decompose and remove harmful components. Further, since the dust-containing gas introduced to the bag filter is introduced from around the bag filter, the dust can be collected almost uniformly regardless of the installation position of the bag filter.

In the present invention, the dust collecting means includes an air guiding means for guiding the treated gas from a space between the discharge electrode and the ground electrode to a predetermined discharge position.

According to the present invention, the treated gas is introduced into the air introducing means, so that the air introducing means is less contaminated. In particular, since the dust collecting means includes the gas guiding means for guiding the treated gas from the space between the discharge electrode and the ground electrode to the predetermined discharge position, the gas guiding means allows dust such as soot and dust around the bag filter. The gas containing the gas is guided to the bag filter, dust such as soot and dust is collected by the bag filter, and the gas from which the dust is removed is guided to the space between the discharge electrode and the ground electrode,
The odorous and harmful components in the gas from which dust has been removed by the plasma generated between the discharge electrode and the ground electrode are decomposed and removed, and the gas after this treatment is guided, for example, in the direction along the axis of the ground electrode to a predetermined discharge position. Can lead to.

FIG. 1 is a sectional view showing a simplified structure of a purifying apparatus 1 which is an embodiment which is the basis of the present invention.
The purifying device 1 includes an inlet lid 2, a dust collector 3, a plasma generator 4, and an outlet lid 5, and includes a gas containing dust such as soot and dust such as soot and odor components. The air containing the harmful components is arranged in this order from the upstream side in the downward direction A. The inlet-side lid body 2 is connected to the first tubular portion 6 to which the duct for guiding the gas is connected, and is expanded to extend along the axial direction of the first tubular portion 6 and to be formed. Open part 7,
A second tubular portion 8 which is continuous with the expanding portion 7 and extends in the axial direction.
And an outward flange 9 that extends outward from the peripheral wall of the second tubular portion 8.

The dust collecting means 3 is supplied with a dust-containing dust, for example, a gas containing fibrous and particulate dust, and collects and removes the fibrous dust from this gas.
0, a gas containing particulate dust from which fibrous dust has been removed, and an electric dust collector 11 that collects and removes particulate dust from this gas; including. The filtration dust collecting portion 10 is a filter 12 that collects fibrous dust, a substantially cylindrical housing 13 in which the filtration filter 12 is housed, and a circumferential wall at both ends of the housing 13 in the axial direction. Outwardly extending flange 14,
15, a supply roll 16 provided on the upper part of the housing 13 and outside the gas passage region, to which the roll-shaped filtration filter 12 is mounted, and a filtration roll mounted on the lower part of the housing 13 and to the supply roll 16. The filter 12 is wound around and wound around a winding roll 17.

The filter 12 is made of, for example, a coarse filter cloth. A roll-shaped filter 12 is attached to the supply roll 16. The filtration filter 12 is stretched over the take-up roll 17, and when the ventilation resistance of the gas passing through the filtration filter 12 becomes large, the take-up roll 17 is provided.
Rolls up the filter 12 to expose a new filter surface. The area where the filtration filter 12 is bridged is
Includes gas passage areas. When the filtration filter 12 is entirely wound up by the winding roll 17, the filtration filter 1 after collecting dust
2 is removed from the winding roll 17 and a new filtration filter 1
2 is attached to the supply roll 16 and bridged over the winding roll 17.

The electric dust collector 11 is realized by, for example, an electric dust collector. The electric dust collector 11 includes a dust collecting portion 18 that collects particulate dust, and a hopper 19 that stores and collects the collected particulate dust. The dust collecting portion 18 includes, for example, a linear discharge electrode and a flat plate-shaped dust collecting electrode. The particulate dust is collected by using the discharge electrode as the negative electrode and the dust collecting electrode as the positive electrode to cause corona discharge between the discharge electrode and the dust collecting electrode to charge the particulate dust, and the dust collecting electrode by the Coulomb force. Adsorbed. When the particulate dust adhering to the dust collecting electrode reaches a predetermined thickness, it is blown off from the dust collecting electrode by hammering and is collected by the hopper 19. Further, outward flanges 21 and 22 are provided on the peripheral wall of the housing 20 of the electrostatic precipitator 11.

The plasma generating means 4 includes a housing 26.
A non-equilibrium plasma generating unit 27 that generates non-equilibrium plasma; and a hopper 28 that stores and collects solid matter generated by a chemical reaction caused by the non-equilibrium plasma. The housing 26 has outwardly facing flanges 29, 3
0 is provided. Here, the non-equilibrium plasma is plasma in which the electron temperature of electrons in the plasma is higher than the ion temperature of ions in the plasma and the electrons and ions are not thermodynamically balanced. The non-equilibrium plasma generating unit 27 includes a discharge electrode, a ground electrode, and a power source (not shown). To generate non-equilibrium plasma, corona discharge is generated between the discharge electrode and the ground electrode, and the gas between the discharge electrode and the ground electrode is ionized. At this time, as shown in FIG. 2, a DC voltage of 30 k to 200 kV, preferably 100 V is applied between the discharge electrode and the ground electrode.
k to 200 kV, frequency 100 to 2000 Hz, that is, period T = 500 μs to 10 ms, preferably frequency 1
A pulse voltage of 000 Hz, that is, a period T = 1 ms is applied. The rise time τ of the voltage is, for example, 20 to
It is 300 ns, preferably 100 ns, and during this extremely short rise time τ, only electrons having a small mass are accelerated to obtain high-speed electrons. Also, since the cycle of the pulse voltage is sufficiently longer than the rise time τ, cooling is performed during this period, and when the next pulse voltage is applied, it returns to the initial state again and the temperature rise of the gas is suppressed and the temperature of the gas is suppressed. Is kept at room temperature. Here, the polarity of the pulse voltage is such that the discharge electrode has a positive polarity and the ground electrode has a negative polarity. This is because the positive streamer corona has a strong development tendency, bridges the space between the discharge electrode and the ground electrode, generates non-equilibrium plasma over the entire space, and significantly improves the reaction effect per unit volume. is there.

The applied voltage is determined with respect to the discharge distance between the discharge electrode and the ground electrode. That is, a high voltage is applied when the discharge distance is large, and a low voltage is applied when the discharge distance is small. When the applied voltage is less than 30 kV, the discharge distance may be small, and accordingly, the number of discharge electrodes and ground electrodes provided in the non-equilibrium plasma generating unit 27 increases, which complicates the structure. There is. When the applied voltage exceeds 200 kV, there is a problem that such a power source is expensive and difficult to obtain.

The frequency of the applied pulse voltage is 100H
When it is less than z, the number of discharges is reduced and the number of electron emission is reduced. This reduces the number of times electrons collide with the gas, and in order to reliably process the gas, it is necessary to lengthen the residence time in the discharge region,
There is a problem that the gas processing efficiency decreases. When the frequency of the applied pulse voltage exceeds 2000 Hz, the gas is not sufficiently cooled during the pulse rest period,
There is a problem that the temperature of the gas rises and transitions to thermal plasma.

The rise time τ of the applied pulse voltage can be shortened by reducing the load on the power supply for supplying the power required for discharge, that is, the capacitance between the discharge electrode and the ground electrode. It To reduce the capacitance, the capacitance to the power source can be reduced by reducing the number of discharge electrodes connected to one power source or by reducing the surface area of the ground electrode. . Rise time τ is 20
When it is less than ns, it is necessary to reduce the number of discharge electrodes connected to the power source in order to shorten the rise time τ when the surface area of the ground electrode is not changed. Along with this, there is a problem that the number of power sources provided in the non-equilibrium plasma generating unit 27 increases. When the rise time τ exceeds 300 ns, the rise of the pulse voltage is not steep, and not only the electrons in the plasma but also the ions and molecules in the plasma are accelerated to cause a spark discharge and transition to thermal plasma. There is.

The outlet lid 5 is connected to the first tubular portion 31 having an inner diameter substantially equal to the inner diameter of the second tubular portion 8 of the inlet lid 2 and the first tubular portion 31, and the inner peripheral surface is the first. First throttle portion 32, which is formed so as to be inclined in a direction close to the axis of the first cylinder portion 31, second tubular portion 33 which is connected to the throttle portion 32 and which is connected to a duct through which clean gas is guided, and first tubular portion And an outward flange 34 extending outward from the peripheral wall of the open end 31 of the base member 31.

A filter dust collecting portion 10 of the inlet side lid 2 and the dust collecting means 3.
And are connected via outward flanges 9 and 14. The filter dust collecting portion 10 and the electric dust collecting portion 11 are the outward flange 2
It is connected to the cylindrical connecting pipe line 25 having 3, 24 via the outward flanges 15, 21. The electric dust collecting portion 11 of the dust collecting means 3 and the plasma generating means 4 are connected to the outward flange 2
2, 29 are connected. The plasma generating means 4 and the outlet cover 5 are connected to each other via outward flanges 30 and 34.

In this way, the inlet side lid 2, the housing 13 of the filter dust collector 10, the connecting conduit 25, the housing 20 of the electrostatic dust collector 11, the housing 26 of the plasma generator 4, and the outlet. The processed gas that has passed through the internal space formed including the side lid 5 is discharged from the opening 150a of the pipeline, which is a predetermined discharge position, through the air guiding means 150 realized by the pipeline or the like. Released into the atmosphere.

The gas containing dust such as soot and dust is used for the inlet side cover 2
The gas is supplied from the first tubular portion 6 in the downward direction A of the gas from the left side of FIG. 1 to the right side of FIG. The gas supplied to the first tubular portion 6 has a flow velocity of 1
It is decelerated to m / s and passes through the filtration filter 12. At this time, the filtration filter 12 collects the fibrous dust in the gas. The gas containing the particulate dust from which the fibrous dust has been removed is supplied to the electric dust collector 11. In the electric dust collector 11, particulate dust is collected by the dust collector 18, and the plasma generating means 4 is supplied with the dust-free gas. In the plasma generation means 4, high-speed electrons of non-equilibrium plasma generated between the discharge electrode and the ground electrode collide with odorous components and harmful components in the gas from which dust has been removed, so that ions, radicals, excited molecules, etc. Cleaner from which odorous components and harmful components are removed by chemically reacting the plasma generating means 4 with chemically reactive species that are highly reactive to chemically decompose the odorous components and harmful components. Such a gas is discharged from the plasma generating means 4. In this chemical reaction, a chemical reaction of an excited molecule and a chain reaction in which ions and radicals are used as a chain-linker are generated. The chemical reaction of the excited molecule and the chain reaction continue as long as at least high-speed electrons are emitted. The clean gas discharged from the plasma generating means 4 is throttled by the throttling portion 32 of the outlet cover 5 to increase the flow velocity, and is discharged from the purifying device 1 through the second tubular portion 33.

That is, the gas supplied to the plasma generating means 4, for example, odorous components such as ammonia, hydrogen sulfide, methyl mercaptan, methyl sulfide, trimethylamine, acetaldehyde, styrene, and methyl disulfide,
In addition, the air containing harmful components such as hydrogen chloride, NO _x , SO _x , and dioxin is generated between the high-speed electrons obtained between the discharge electrode and the ground electrode of the plasma generating means 4 and the odorous components and harmful components in the gas. The collision produces chemically active species and causes a chemical reaction to remove odorous components and harmful components in the gas. In this way, the air containing the odorous components and harmful components is treated to be clean air.

When a gas containing an odorous component and a harmful component is treated using this purifying apparatus 1, the odorous component is 9
About 9%, about 90-99% for dioxins, about 90% for nitric oxide NO, about 50% for NOx, SO
At x, about 90% is removed from the gas.

When dust is supplied to the plasma generating means 4, the dust is charged by the high-speed electrons of the non-equilibrium plasma and adheres to the ground electrode, which requires time and effort for cleaning the plasma generating means 4. When the dust is fibrous, the dust adheres to the ground electrode vertically,
A spark discharge is generated between the discharge electrode and the tip of the dust to lower the voltage, which causes a problem that high-speed electrons cannot be obtained. However, in the purifying device 1 of the present invention, since the gas from which dust has been removed is supplied to the plasma generating means 4, such a problem does not occur.

The dust collecting means 3 collects and removes dust from a gas containing dust such as soot dust, and since only the gas from which dust has been removed is supplied to the plasma generating means 4, plasma generated by discharge is generated. By this, the odorous components and harmful components in the gas from which the dust has been removed can be decomposed and removed, and the trouble of cleaning the plasma generating means 4 and the like is eliminated,
Maintenance of the purification device 1 can be facilitated with a simple configuration.

The plasma generating means 4 ionizes the gas between the discharge electrode and the ground electrode into electrons and ions by discharge, for example, corona discharge, and the electron temperature of the electrons is higher than the ion temperature of the ions. Since non-equilibrium plasma, which is a plasma in which electrons and ions are not thermodynamically equilibrated, is generated, the gas in the plasma atmosphere between the electrodes generated by the discharge is rapidly heated at room temperature. The electrons can be obtained, and these high-speed electrons collide with the odorous and harmful components in the gas from which dust has been removed to form radicals, which causes a chemical reaction to remove the odorous and harmful components in the gas. Can be removed. Furthermore, since the temperature of the gas in the plasma atmosphere between the electrodes generated by the discharge is kept at room temperature, it is not necessary to provide the plasma generating means 4 with a cooling means or the like. Further, the temperature of the gas discharged from the plasma generating means 4 is also kept at room temperature, high temperature gas is not discharged unlike the case of using thermal plasma, and it is not necessary to provide a cooling means for the discharged gas. The configuration can be simplified.

FIG. 3 is a simplified front view showing the discharge electrode 40 and the ground electrode 41 of the non-equilibrium plasma generator 27 provided in the purifying device 1, and FIG. 4 is a sectional line I of FIG.
It is sectional drawing seen from V-IV. In FIG. 3 and FIG. 4, the discharge electrode 40 is shown with its diameter enlarged for ease of illustration.

The discharge electrode 40 is made of a conductive material such as steel, and is a linear body having a circular cross section.
The ground electrode 41 is made of a conductive material, such as steel, and is made of a tubular body having a plurality of through holes 42 formed therein. That is, the ground electrode 41 is formed in a so-called mesh shape.
The discharge electrode 40 is coaxially arranged in the space 43 surrounded by the ground electrode 41. The discharge electrode 40 is arranged so as to face at least the entire length of the ground electrode 41 in the longitudinal direction.
A plurality of the discharge electrodes 40 and the ground electrodes 41 are provided in the non-equilibrium plasma generating unit 27 with the ground electrodes 41 in contact with each other. The gas from which the dust has been removed is supplied in the downward direction A of the gas from the lower side to the upper side in FIG. The gas is passed through the through holes 42 from the side surface of the ground electrode 41.
Is supplied to the space 43 surrounded by the ground electrode 41 in which non-equilibrium plasma is generated, and decomposes and removes odorous components and harmful components in the gas, and the decomposed and removed gas is discharged from the space 43 to the through holes 42. Discharge through.

As an example of the dimensions of the discharge electrode 40 and the ground electrode 41, the diameter D1 of the discharge electrode 40 is 1 to 5 mm.
Selected to the degree. The inner diameter D2 of the ground electrode 41 is 250
It is selected to be about mm. Axial length L of the earth electrode 41
1 is selected to be about 3 to 10 m. The thickness t of the peripheral wall of the ground electrode 41 is selected to be about 2 mm.

Since a plurality of through holes 42 are formed in the ground electrode 41, the dust-free gas is introduced into the space 43 surrounded by the ground electrode 41 where non-equilibrium plasma is generated through the through holes 42. The gas can be supplied to decompose and remove odorous components and harmful components in the gas, and the decomposed and removed gas can be discharged from the space 43 through the through holes 42. Further, not only the axial direction of the ground electrode 41, but also the gas from which dust has been removed can be passed in a direction intersecting with this axial direction. At the same time, the surface area of the ground electrode 41 can be made smaller than the surface area of the ground electrode of the same size in which the plurality of through holes 42 are not formed.
As a result, the capacitance between the discharge electrode 40 and the ground electrode 41 is reduced, the time required to reach the discharge potential is shortened, non-equilibrium plasma is easily generated, and high-speed electrons can be obtained.

Further, since the respective ground electrodes 41 are arranged in contact with each other, the gas is surely kept in contact with the ground electrodes 41.
Can be passed through, and the gas can be reliably processed. As a result, the processing efficiency of the gas can be improved. At the same time, each ground electrode does not need to be individually grounded, and the configuration can be simplified.

When the gas is passed in the axial direction of the ground electrode 41, the gas flows in the space 43 inside the ground electrode 41.
And a space 44 surrounded by a plurality of ground electrodes 41 adjacent to each other. In the space 43 inside the ground electrode 41, odorous components and harmful components in the gas are decomposed and removed by collision of electrons at high speed. In the space 44 surrounded by the plurality of ground electrodes 41 adjacent to each other, the odorous components and harmful components in the gas pass without being decomposed and removed. Therefore, in order to improve the processing efficiency of the gas, the space 44 should be as small as possible. Therefore, it is necessary to reduce the inner diameter D2 of the ground electrode 41 and arrange the ground electrodes 41 densely. When processing a large amount of gas, since the ground electrodes 41 are closely arranged, a large number of discharge electrodes 40 are provided.
Also, the ground electrode 41 must be used, which complicates the configuration. Also, with the ground electrode 41 densely arranged,
If the numbers of the discharge electrodes 40 and the ground electrodes 41 are reduced, the amount of gas to be processed must be reduced, and the amount of discharged gas is restricted. Therefore, by passing the gas in a direction intersecting the axial direction of the earth electrode 41, the gas can pass through the space 43 over the entire length of the earth electrode 41 in the longitudinal direction. As a result, the processing area of the gas is increased, and a large amount of gas can be processed.

Although the ground electrode 41 is formed in a cylindrical shape, it is not limited to this and may be formed in a rectangular tube shape. The ground electrodes 41 are arranged in contact with each other, but the invention is not limited to this.
They may be arranged apart from each other.

With this configuration, compared to the case where all the ground electrodes 41 are in contact with each other,
Even if one earth electrode 41 is displaced undesirably, the problem that all the earth electrodes are displaced does not occur,
The distance between each discharge electrode 40 and each ground electrode 41 can be maintained with high accuracy.

FIG. 5 is a simplified front view showing the discharge electrode 110 and the ground electrode 111 of the non-equilibrium plasma generating portion 27a provided in the purifying apparatus according to one embodiment of the present invention, and FIG. 6 is a non-equilibrium plasma. It is a top view which shows a part of generation part 27a. 5 and 6, the discharge electrode 1
In order to facilitate the illustration, reference numeral 10 is shown with its thickness enlarged.

The discharge electrode 110 is made of a conductive material such as steel, and is a linear body having a square cross section. The ground electrode 111 is made of a conductive material such as steel. Further, the ground electrode 111 is the spiral body 11
Two and a plurality (two in the present embodiment) of holding members 113. The spiral body 112 extends along the axis of the discharge electrode 110 and has a circular cross-section.
This linear body is formed in a spiral shape having a loop shape having a substantially constant inner diameter D10 and a substantially constant pitch p1 around the discharge electrode 110. A plurality of holding members 113
Extends in the axis of the discharge electrode 110 and has a circular cross section, and holds the pitch p1 of the spiral body 112 on the outer peripheral portion of the spiral body 112. Each holding member 1
13 is provided in line symmetry with respect to the central axis on one diameter line of the spiral body 112. Each holding member 113 is made of, for example, steel, and is welded to the outer peripheral portion of the spiral body 112 at a plurality of positions at intervals in the axial direction. In the space 114 surrounded by the ground electrode 111, the discharge electrode 1
10 are arranged coaxially. The discharge electrode 110 is arranged so as to face at least the entire length of the ground electrode 111 in the longitudinal direction.

Discharge electrode 110 and ground electrode 111
In the non-equilibrium plasma generating part 27a, a plurality of the holding members 113 are arranged so that the axial direction is the vertical direction (vertical direction in FIG. 5) and each holding member 113 faces a gas flowing direction A described later. In addition, each discharge electrode 110 and each ground electrode 1
11 are arranged in a zigzag pattern with an interval between them. A weight 115 is provided at the lower end of each discharge electrode 110. The gas from which the dust has been removed is supplied in the downward direction A of the gas from the lower side to the upper side in FIG. Here, in the embodiment of the present invention, "staggered" means that each discharge is at a predetermined first position 116 at equal intervals d10 in a direction perpendicular to the gas flow direction A (left-right direction in FIG. 6). The electrodes 110 are arranged, and the ground electrodes 111 are arranged so as to be coaxial with the discharge electrodes 110.
The second position 117, which is the position of the apex of an equilateral triangle whose side is the distance d10 between the adjacent discharge electrodes 110 in
In this state, the discharge electrodes 110 and the ground electrodes 111 are arranged.

At the second position 117, a pair of inner peripheral surfaces 26a and 26b extending in the vertical direction of the housing 26 (direction perpendicular to the paper surface of FIG. 6) and facing each other extend in the vertical direction and face the housing 26. A pair of baffle plates 118a, 1 protruding toward the inner peripheral surfaces 26a, 26b
18b are provided respectively. Each baffle plate 11
8a, 118b and each ground electrode 11 adjacent to each baffle plate 118a, 118b at the second position 117
The distance between the inner peripheral surfaces 26a, 26b and the respective ground electrodes 111c, 111d adjacent to the inner peripheral surfaces 26a, 26b at the first position 116 is selected to be equal to the distance between the inner peripheral surfaces 26a, 26b.

The gas is supplied to the space 114 surrounded by the ground electrode 111 where non-equilibrium plasma is generated from the side of the ground electrode 111 through the void 119 of the spiral body 112, and the gas in the gas is supplied. The odorous components and harmful components are decomposed and removed, and the gas thus decomposed and removed is the space 1
14 is discharged through the gap 119. Also the first
The gas passing between the ground electrodes 111 at the positions 116 is guided to the space 114 surrounded by the ground electrodes 111 in which the non-equilibrium plasma is generated at the second positions 117. In this way, the gas is treated.

Each discharge electrode 110 and each ground electrode 11
For example, the length B1 of one side of the cross section of the discharge electrode 110 is selected to be about 2 to 6 mm, preferably about 4 mm. The inner diameter D10 of the ground electrode 111 is 50 to 1
It is selected to be about 000 mm, preferably about 200 mm. The axial length L10 of the ground electrode 111 is 3 to 10
m, preferably about 3 m. Spiral 11
The diameter D11 of the linear body forming 2 is selected to be about 2 to 7 mm, preferably about 5 mm. The pitch p1 of the spiral body 112 is selected to be about 30 mm. Each discharge electrode 110
The distance d10 between them is selected to be about 220 mm. The axial length L11 of each holding member 113 is selected to be about 3 m. The diameter D12 of each holding member 113 is selected to be about 4 mm.

Since the earth electrode 111 is formed in a spiral shape, the distance between the discharge electrode 110 and the earth electrode 111 provided coaxially with the axis of the earth electrode 111 can be kept constant, and the discharge distance can be highly accurate. Can be held at.

Further, the ground electrode 11 according to the embodiment of the present invention.
1 is easier to manufacture than when it is formed in a net shape, for example. That is, when forming the ground electrode in a mesh shape, it is necessary to weld the intersections of the members forming the mesh to form a mesh member, then form the member in a cylindrical shape, and weld the connecting portion. . Therefore, it takes time and labor for manufacturing, and it is difficult to manufacture a ground electrode with high processing accuracy. In the ground electrode 111 according to the embodiment of the present invention, a linear body is wound around a roll or the like to form a spiral body 112, and a plurality of holding members 113 are provided on the outer peripheral portion of the spiral body 112 in the axial direction. It can be manufactured simply by opening and welding multiple points. Therefore, the ground electrode 111 with good processing accuracy can be easily manufactured.

Furthermore, the discharge region between the discharge electrode 110 and the ground electrode 111, in which high-speed electrons are obtained, is formed in a spiral shape. Further, by selecting the pitch of the spiral body 112 as p1, the discharge region between the discharge electrode 110 and the ground electrode 111 can be formed in a highly accurate virtual columnar shape. Therefore, the gas containing the odorous component and the harmful component from which dust is removed can be reliably treated by passing the gas in either the axial direction of the earth electrode 111 or the direction intersecting the axial direction. At the same time, the surface area of the ground electrode 111 can be made much smaller than the surface area of the ground electrode of the same size formed in a cylindrical shape, for example. As a result, the capacitance between the discharge electrode 110 and the ground electrode 111 can be reduced, the time required to reach the discharge potential can be shortened, non-equilibrium plasma can be easily generated, and high-speed electrons can be obtained.

Further, the pitch p1 of the ground electrodes 111
By changing, it is easy to adjust the surface area of the ground electrode 111 at a constant inner diameter D10 and a constant length L10.

Each holding member 113 has the spiral body 112.
Since each of the holding members 113 is welded and fixed to the outer periphery of the holding member 113, the spiral member 112 can be easily fixed.
At the same time, the welded portion does not protrude radially inward from the spiral body 112, and damage to the ground electrode 111 caused by the protrusion of the welded portion can be prevented.
That is, the discharge distance is shortened due to the protrusion of the welded portion, and spark discharge is likely to occur between the discharge electrode 110 and the welded portion in proportion to the square of the discharge distance, and transition to arc discharge occurs. Melts.
Arc discharge is further generated in the melted portion, and the ground electrode 111 is damaged. Ground electrode 1
In order to prevent damage to the welded portion 11,
It is realized by welding on the outer peripheral side of the spiral body 112 so as not to project from 12. With this configuration, arc discharge does not occur, and the earth electrode 111
Is prevented from being damaged.

Each holding member 113 has the spiral body 112.
Since the holding member 113 and the discharge electrode 110 are arranged in line symmetry with respect to the central axis line on one diameter line and face the downflow direction A of the gas, the holding member 113 and the discharge electrode 110 are parallel to the downflow direction A of the gas. It will be arranged on the diameter line. As a result, the pressure loss of the gas becomes smaller than that when each holding member 113 and the discharge electrode 110 are arranged on one diameter line parallel to the direction intersecting the flow-down direction A of the gas. The space 114 surrounded by the ground electrode 111 can easily pass through.

Each inner peripheral surface 26a, 2 of the housing 26
The baffle plate 118a, the second position 117 of 6b,
Since the respective 118b are provided, the gas flowing through the gap 120 between the respective inner peripheral surfaces 26a, 26b and the respective ground electrodes 111c, 111d adjacent to the respective inner peripheral surfaces 26a, 26b at the first position 116 is baffled by the baffle plate. 11
The gas can be guided to each of the ground electrodes 111 arranged at the second position 117 by 8a and 118b, and the gas can be reliably processed.

Since the respective ground electrodes 111 are arranged at a distance from each other, even if one ground electrode 111 is displaced undesirably compared with the case where all the ground electrodes 111 are in contact with each other, The problem that all the ground electrodes 111 are displaced does not occur, and the distance between each discharge electrode 110 and each ground electrode 111 can be maintained with high accuracy.

FIG. 7 is a plan view showing a part of non-equilibrium plasma generating portion 27a1 provided in the purifying apparatus according to another embodiment of the present invention. In the present embodiment, the same reference numerals are attached to the portions corresponding to the configurations of the above-described embodiments,
The description is omitted. In FIG. 7, the thickness of the discharge electrode 110 is shown in an enlarged scale for ease of illustration.

Discharge electrode 110 and ground electrode 111
The discharge electrode 110 in the non-equilibrium plasma generating unit 27a1.
And the holding electrode 11 such that the axial direction of the ground electrode 111 is the vertical direction (direction perpendicular to the paper surface of FIG. 7).
A plurality of 3 are arranged so as to face in the downward direction A (the direction from the lower side to the upper side in FIG. 7) of the gas containing the odorous component and the harmful component from which dust has been removed. The discharge electrodes 110 and the ground electrodes 111 are arranged in a zigzag pattern with a space between them. Here, in the embodiment of the present invention, "staggered" means a direction perpendicular to the gas flow direction A (see FIG. 7).
The number of each discharge electrode 110 arranged at a predetermined first position 121 at equal intervals d10 in the left-right direction), and the number of each ground electrode 111 arranged coaxially with each discharge electrode 110; Each of the discharge electrodes 110 arranged at the second position 122, which is the position of the apex of an equilateral triangle having the distance d10 between the discharge electrodes 110 at each position as one side, and each arranged so as to be coaxial with each discharge electrode 110. The number of the ground electrodes 111 is the same, and the discharge electrodes 110 and the ground electrodes 111 at the second position 122 are connected to the first position 121.
With respect to each discharge electrode 110 and each ground electrode 111 in the direction perpendicular to the gas flow direction A.
It means a state where they are displaced by half of 0.

A pair of inner peripheral surfaces 26a, 26b extending in the vertical direction of the housing 26 at the first position 121 and facing each other.
Among them, the inner peripheral surface 26a on one side (right side in FIG. 7) extends in the vertical direction and the inner peripheral surface 26 on the other side (left side in FIG. 7).
A first baffle plate 123a protruding toward b is provided. A second baffle plate 123b that extends in the vertical direction and projects toward the inner peripheral surface 26a on one side is provided on the inner peripheral surface 26b on the other side of the second position 122. First baffle plate 123a and first position 121
The distance from the ground electrode 111e adjacent to the first baffle plate 123a in the
The distance from the ground electrode 111f adjacent to the inner peripheral surface 26b on the other side at the first position 121 is selected to be equal. Second
The baffle plate 123b and the ground electrode 1 adjacent to the second baffle plate 123b at the second position 122
The distance between the inner peripheral surface 26a on one side and the second position 1
The distance to the ground electrode 111h adjacent to the inner peripheral surface 26a on one side of 22 is selected to be equal. First position 121
The distance between the first baffle plate 123a and the inner peripheral surface 26b on the other side is selected to be equal to the distance between the second baffle plate 123b and the inner peripheral surface 26a on the one side at the second position 122.

The gas containing the odorous component and the harmful component from which dust has been removed is supplied in the downward direction A. First position 12
The gas passing through the positions facing the respective ground electrodes 111 in No. 1 is the ground electrodes 111 in which non-equilibrium plasma is generated.
It passes through a space 114 surrounded by. First position 12
The gas passing between the respective ground electrodes 111 in No. 1 and between the first baffle plate 123a and the ground electrode 111b passes through the space 114 surrounded by the ground electrodes 111 in which the non-equilibrium plasma is generated at the second position 122. . The gas passing near the inner peripheral surface 26a on the one side on the upstream side of the gas downward direction A from the first position 121 is guided to the inner peripheral surface 26b on the other side by the first baffle plate 123a, and Space 114 surrounded by the ground electrode 111 in which equilibrium plasma is generated
Pass through. The inner peripheral surface 26b on the other side and the ground electrode 1
The gas passing through the gap 124 between the
The inner peripheral surface 26 on one side by the baffle plate 123b
It is guided to the a side and passes through the space 114 surrounded by the ground electrode 111 in which non-equilibrium plasma is generated. In this manner, the gas is discharged after the odorous components and harmful components in the gas are decomposed and removed by the nonequilibrium plasma.

The distance between the first baffle plate 123a and the inner peripheral surface 26b on the other side at the first position 121, and the second
Since the distance between the second baffle plate 123b and the inner peripheral surface 26a on one side at the position 122 is selected to be equal,
The change in the cross-sectional area of the flow path of the gas is reduced, and the pressure loss of the gas can be reduced. As a result, the gas is enclosed in the space 1 surrounded by the earth electrode 111.
The gas can be easily passed through and the gas can be reliably processed.

FIG. 8 is a simplified front view showing the discharge electrode 130 and the ground electrode 131 of the non-equilibrium plasma generating part 27b provided in the purifying apparatus according to still another embodiment of the present invention, and FIG. It is a top view which shows a part of equilibrium plasma generation part 27b. In FIG. 8 and FIG. 9, the discharge electrode 130 is shown by enlarging its thickness in order to facilitate the illustration.

The discharge electrode 130 is made of a conductive material such as steel, and is a linear body having a square cross section. The ground electrode 131 is made of a conductive material such as steel. The ground electrode 131 is composed of a plurality of ring-shaped bodies 132 and a plurality of (two in the present embodiment) holding members 133. Each of the plurality of ring-shaped bodies 132 is a linear body having a circular cross-section, and has a loop-shaped outer shape having a substantially constant inner diameter D13 centered on the discharge electrode 130 and a circular ring-shaped outer shape. Each ring-shaped body 132
A substantially constant interval p2 is provided along the axis of the discharge electrode 130.
Will be placed. The plurality of holding members 132 extend in the direction of the axis 2 and have a circular cross-sectional shape, and are provided line-symmetrically with respect to the central axis on one diameter line of each ring-shaped body 132. Each holding member 133 corresponds to each ring-shaped body 1
It is fixed to the outer peripheral portion of 32 and holds the interval p2 between the ring-shaped bodies 132. Each ring-shaped body 132 is arranged so that its central axis is coaxial with the axis of the discharge electrode 130. Each ring-shaped body 132 and each holding member 133 are welded on one diameter line of each ring-shaped body 132.
The discharge electrode 130 is coaxially arranged in the space 134 surrounded by the ground electrode 131. The discharge electrode 130 is
It is arranged so as to face at least the entire length of the ground electrode 131 in the longitudinal direction.

Discharge electrode 130 and ground electrode 131
In the non-equilibrium plasma generating unit 27b, a plurality of the holding members 133 are arranged so that the axial direction is the vertical direction (vertical direction in FIG. 8) and each holding member 133 faces a gas flowing direction A described later. In addition, each discharge electrode 130 and each ground electrode 1
The 31s are arranged in a zigzag pattern at intervals. A weight 135 is provided at the lower end of each discharge electrode 130. The gas from which the dust is removed is supplied in the downward direction A of the gas from the lower side to the upper side in FIG. Here, in the embodiment of the present invention, “staggered” means that each discharge is at a predetermined first position 136 with an equal interval d11 in the direction perpendicular to the gas flow direction A (left-right direction in FIG. 9). The electrodes 130 are arranged, and the ground electrodes 131 are arranged so as to be coaxial with the discharge electrodes 130.
The distance d11 between adjacent discharge electrodes 130 at 36
The second position 13 which is the position of the vertex of an equilateral triangle having
7 shows a state in which each discharge electrode 130 and each ground electrode 131 are arranged.

At the second position 137, a pair of inner peripheral surfaces 26a and 26b extending in the vertical direction of the housing 26 (direction perpendicular to the paper surface of FIG. 9) and facing each other extend in the vertical direction and face the housing 26. A pair of baffle plates 138a, 1 protruding toward the inner peripheral surfaces 26a, 26b
38b are provided respectively. Each baffle plate 13
8a, 138b and each ground electrode 1 adjacent to each baffle plate 138a, 138b at the second position 137.
The intervals between the inner peripheral surfaces 26a and 26b are 31a and 131b.
Is set to be equal to the distance between each of the ground electrodes 131c and 131d adjacent to each of the inner peripheral surfaces 26a and 26b at the first position 136.

The gas is supplied to the space 134 surrounded by the ground electrode 131 where non-equilibrium plasma is generated from the side of the ground electrode 131 through the gap 139 between the ring-shaped bodies 132, and The odorous components and harmful components are decomposed and removed, and the decomposed and removed gas is discharged from the space 134 through the void 139. Also,
The gas that has passed between the ground electrodes 131 at the first position 136 is surrounded by the ground electrode 131 at which the non-equilibrium plasma is generated at the second position 137.
Guided to 4. In this way, the gas is processed.

Each discharge electrode 130 and each ground electrode 13
For example, the length B2 of one side of the cross section of the discharge electrode 130 is selected to be about 2 to 6 mm, preferably about 4 mm. The inner diameter D13 of the ground electrode 131 is 50 to
It is selected to be about 1000 mm, preferably about 200 mm. Axial length of ground electrode 131 and holding member 1
The axial length L13 of 33 is selected to be about 3 to 10 m, preferably about 3 m. The diameter D14 of the linear body forming each ring-shaped body 132 is selected to be about 2 to 7 mm, preferably about 5 mm. Interval p between each ring-shaped body 132
2 is selected to be about 30 mm. The distance d11 between the discharge electrodes 130 is selected to be about 220 mm.

Since the plurality of ring-shaped bodies 132 are formed in a loop shape along the axis of the discharge electrode 130 with a space between each other, the ground electrode 131 is formed.
The distance between the discharge electrode 130 and the ground electrode 131 provided coaxially with the axis can be kept constant, and the discharge distance can be kept with high accuracy.

Further, the ground electrode 13 according to the embodiment of the present invention.
1 is easier to manufacture than when it is formed in a net shape, for example. That is, when forming the ground electrode in a mesh shape, it is necessary to weld the intersections of the members forming the mesh to form a mesh member, then form the member in a cylindrical shape, and weld the connecting portion. . Therefore, it takes time and labor for manufacturing, and it is difficult to manufacture a ground electrode with high processing accuracy. In the ground electrode 131 according to the embodiment of the present invention, a linear body is formed in a ring shape to form a plurality of ring-shaped bodies 132.
A plurality of holding members 133 can be manufactured by simply welding the plurality of holding members 133 to the outer peripheral portion of 32 at intervals in the axial direction. Therefore, the ground electrode 131 with good processing accuracy can be easily manufactured.

Furthermore, the discharge region between the discharge electrode 130 and the ground electrode 131, in which high-speed electrons are obtained, is formed in a disc shape. In addition, the interval between the ring-shaped bodies 132 is p
By selecting 2, the discharge region between the discharge electrode 130 and the ground electrode 131 can be formed in a highly accurate virtual columnar shape. Therefore, the gas containing the odorous component and the harmful component from which dust has been removed can be reliably treated by passing the gas in either the axial direction of the ground electrode 131 or the direction intersecting the axial direction. At the same time, the surface area of the ground electrode 131 can be made much smaller than the surface area of the ground electrode of the same size formed in a cylindrical shape, for example. As a result, the capacitance between the discharge electrode 130 and the ground electrode 131 can be reduced, the time required to reach the discharge potential can be shortened, non-equilibrium plasma can be easily generated, and high-speed electrons can be obtained.

When the spacing between the ring-shaped bodies 132 is selected to be larger than p2, the discharge regions are formed with a spacing in the axial direction. Along with this, the gas passes through a region in which high-speed electrons cannot be obtained between the discharge regions, resulting in a problem that the gas is not processed. In order to solve this problem, each ring-shaped body 132 of the ground electrode 131 at the second position 137 is replaced by the first position 13
The ground electrode 131 of No. 6 may be arranged at a position so as to face the intermediate portion between the ring-shaped bodies 132. As a result, the second position 137 is located at a position facing the region where high-speed electrons cannot be obtained between the discharge regions of the ground electrode 131 at the first position 136.
The discharge area of the ground electrode 131 where high-speed electrons can be obtained is exposed, and the gas can be reliably processed.

Further, since the axis of each ring-shaped body 132 is provided coaxially with the axis of the discharge electrode 130, each ring-shaped body 132 has a spiral ground electrode 131 when viewed from the upstream side of the gas flow direction A. The opening area between the ring-shaped bodies 132 is larger than when they are formed. Therefore, it is possible to reduce the pressure loss when the gas is passed through the ground electrode 131, and the gas is prevented from flowing into the ground electrode 1.
It is possible to easily pass through the space 134 surrounded by 31.

Each holding member 133 has a ring-shaped body 132.
Since each of the holding members 133 is fixed to the ring-shaped body 132 by welding and fixed to the outer peripheral portion thereof, it is easy to fix the holding members 133 to the ring-shaped bodies 132. At the same time, the welded portion does not protrude radially inward from each ring-shaped body 132, and damage to the ground electrode 131 caused by the protrusion of the welded portion can be prevented. That is, the protrusion of the welded portion shortens the discharge distance, and the discharge electrode 130 is proportional to the square of the discharge distance.
Also, spark discharge is likely to occur between the welded portions, transition to arc discharge, and the ground electrode 131 is melted. Arc discharge is further generated in the melted portion, and the ground electrode 131 is damaged. In order to prevent the ground electrode 131 from being damaged, welding is performed on the outer peripheral side of each ring-shaped body 132 so that the welded portion does not protrude from each ring-shaped body 132. With this structure, arc discharge does not occur and the ground electrode 131 is prevented from being damaged.

Each holding member 133 has a ring-shaped body 132.
The holding member 133 and the discharge electrode 130 are arranged in line symmetry with respect to the central axis line on one diameter line and face the downflow direction A of the gas. It will be arranged on the diameter line. As a result, the pressure loss of the gas becomes smaller than that when each holding member 133 and the discharge electrode 130 are arranged on one diameter line parallel to the direction intersecting the downflow direction A of the gas. The space 134 surrounded by the ground electrode 131 can easily pass through.

Each inner peripheral surface 26a, 2 of the housing 26
The second position 137 of 6b has a pair of baffle plates 13
Since 8a and 138b are provided respectively, the first position 1
The gas flowing through the gap 140 between the respective inner peripheral surfaces 26a, 26b adjacent to the respective inner peripheral surfaces 26a, 26b in the reference numeral 36 and the respective inner peripheral surfaces 26a, 26b is moved to the second position 137 by the respective baffle plates 138a, 138b. The gas can be guided to each of the arranged ground electrodes 131, and the gas can be reliably processed.

Since the respective ground electrodes 131 are arranged at a distance from each other, even if one ground electrode 131 is undesirably displaced as compared with the case where all the ground electrodes 131 are in contact with each other, The problem that all the ground electrodes 131 are displaced does not occur, and the distance between each discharge electrode 130 and each ground electrode 131 can be maintained with high accuracy.

FIG. 10 shows a non-equilibrium plasma generating section 27 provided in a purifying apparatus according to still another embodiment of the present invention.
It is a top view which shows a part of b1. In this embodiment,
The same reference numerals are given to the portions corresponding to the configurations of the above-described embodiments, and the description will be omitted. In FIG. 10, the discharge electrode 1
Reference numeral 30 shows the thickness in an enlarged manner for ease of illustration.

Discharge electrode 130 and ground electrode 131
The discharge electrode 130 in the non-equilibrium plasma generating unit 27b1.
And the axial direction of the ground electrode 131 is vertical (see FIG.
(Perpendicular to the paper surface of) and each holding member 1
A plurality of 33 are arranged so as to face the downward direction A of the gas containing the odorous component and the harmful component from which dust has been removed (the direction from the lower side to the upper side in FIG. 10). In addition, each discharge electrode 13
The zero electrodes and the ground electrodes 131 are arranged in a zigzag pattern with a space therebetween. Here, in the embodiment of the present invention, "staggered" is arranged at a predetermined first position 141 at equal intervals d11 in a direction perpendicular to the gas flow direction A (left-right direction in FIG. 10). The number of discharge electrodes 130 and the number of ground electrodes 131 arranged coaxially with each discharge electrode 130, and the apex of an equilateral triangle having the distance d11 between the discharge electrodes 130 at the first position 141 as one side. The number of the discharge electrodes 130 arranged at the second position 142, which is the position, and the number of the ground electrodes 131 arranged coaxially with the discharge electrodes 130 are equal to each other. Each ground electrode 131
Of the first position 141 with respect to each of the discharge electrodes 130 and each of the ground electrodes 131 are displaced by a half of the distance d11 in the direction perpendicular to the gas flow direction A.

A pair of inner peripheral surfaces 26a, 26b extending in the vertical direction of the housing 26 at the first position 141 and facing each other.
Of the inner peripheral surface 26a on one side (right side of FIG. 10),
The first baffle plate 143 that extends in the vertical direction and projects toward the inner peripheral surface 26b on the other side (the left side in FIG. 10).
a is provided. Inner peripheral surface 26 on the other side of second position 142
The b is provided with a second baffle plate 143b that extends in the vertical direction and projects toward the inner peripheral surface 26a on one side. First baffle plate 143a and first position 1
The space between the first electrode 41e and the ground electrode 131e adjacent to the first baffle plate 143a is equal to the inner peripheral surface 26b on the other side.
And the ground electrode 131f adjacent to the inner peripheral surface 26b on the other side at the first position 141 are selected to be equal to each other.
The interval between the second baffle plate 143b and the ground electrode 131g adjacent to the second baffle plate 143b at the second position 142 is equal to the inner peripheral surface 26a on one side and the second inner surface 26a.
The distance to the ground electrode 131h adjacent to the inner peripheral surface 26b on one side at the position 142 is selected to be equal. The distance between the first baffle plate 143a and the inner peripheral surface 26b on the other side at the first position 141 is selected to be equal to the distance between the second baffle plate 143b and the inner peripheral surface 26a on the one side at the second position 142.

The gas containing dust-removed odorous components and harmful components is supplied in the downward direction A. First position 14
The gas passing through the positions facing the respective ground electrodes 131 in No. 1 has the ground electrodes 131 in which non-equilibrium plasma is generated.
It passes through a space 134 surrounded by. First position 14
The gas passing between the respective ground electrodes 131 in No. 1 and between the first baffle plate 143a and the first ground electrode 131e passes through the space 134 surrounded by the ground electrodes 131 in which the non-equilibrium plasma is generated at the second position 142. To do. The gas passing near the inner peripheral surface 26a on the one side on the upstream side in the downward direction A of the gas from the first position 141 is guided to the inner peripheral surface 26b on the other side by the first baffle plate 143a to be unbalanced. The plasma passes through a space 134 surrounded by the ground electrode 131. The inner peripheral surface 26b on the other side and the ground electrode 131
The gas passing through the space 144 between the earth electrode 13 and the inner electrode 26a is guided by the second baffle plate 143b toward the inner peripheral surface 26a on one side, and the non-equilibrium plasma is generated.
It passes through a space 134 surrounded by 1. In this manner, the gas is discharged after the odorous components and harmful components in the gas are decomposed and removed by the nonequilibrium plasma.

The distance between the first baffle plate 143a and the inner peripheral surface 26b on the other side at the first position 141, and the second
Since the distance between the second baffle plate 143b and the inner peripheral surface 26a on one side at the position 142 is selected to be equal,
The change in the cross-sectional area of the flow path of the gas is reduced, and the pressure loss of the gas can be reduced. As a result, the gas is enclosed in the space 1 surrounded by the earth electrode 131.
The gas can be easily passed through 34, and the gas can be reliably processed.

FIG. 11 shows a non-equilibrium plasma generating part 27c provided in the purifying apparatus which is the basic embodiment of the present invention.
12 is a simplified front view showing the discharge electrode 50 and the ground electrode 51 of FIG. 12, and FIG. 12 is a section line XII-XI of FIG.
It is the sectional view seen from I. In FIGS. 11 and 12, the discharge electrode 50 is shown with its diameter enlarged for ease of illustration.

The discharge electrode 50 is made of a conductive material such as steel, and is a linear body having a circular cross section.
In addition, a plurality of them are provided at intervals. Ground electrode 5
Reference numeral 1 denotes a conductive material, for example, steel, which is a flat plate-like body having a plurality of through holes 52 formed therein, and is arranged on both sides of the plurality of discharge electrodes 50 with a certain distance d2. . That is, the ground electrode 51 is formed in a so-called mesh shape. The plurality of discharge electrodes 50 are provided in a plurality of rows in the non-equilibrium plasma generating unit 27c. The discharge electrode 50 is arranged so as to face at least the entire length of the ground electrode 51 in the longitudinal direction.

The gas from which the dust has been removed is supplied in the downward direction A of the gas from the lower side to the upper side in FIG. This gas is supplied to the space 53 between the ground electrodes 51 where non-equilibrium plasma is generated from the side surface side of the ground electrode 51 through each through hole 52, and decomposes and removes the odorous components and harmful components in the gas. The decomposed and removed gas is discharged from the space 53 through each through hole 52.

As an example of the dimensions of the discharge electrode 50 and the ground electrode 51, the diameter D1 of the discharge electrode 50 is 1 to 5 m.
m is selected. The distance d1 between the discharge electrodes 50 is 1
It is selected to be around 00m. The distance d2 between each discharge electrode 50 and the ground electrode 51 is selected to be about 125 mm. The thickness t of the ground electrode 51 is selected to be about 2 mm, for example. The width W of the ground electrode 51 is selected to be about 3 m. The length L2 in the longitudinal direction of the ground electrode 51 is selected to be about 3 to 10 m.

Since a plurality of through holes 52 are formed in the ground electrode 51, the space 5 between the ground electrodes 51 in which non-equilibrium plasma is generated through the through holes 52 for the gas from which dust has been removed
3, the odorous components and harmful components of the gas are decomposed and removed, and the decomposed and removed gas can be discharged from the space 53 through each through hole 52. Further, not only in the direction parallel to the ground electrode 51 and in the direction intersecting with the discharge electrode 50 and the direction along each discharge electrode 50, but also in the direction in which the dust is removed from the ground electrode 51 side in the direction intersecting each discharge electrode 52. Can be processed at high flow rates to treat the gas. Along with this, the surface area of the ground electrode 51 can be made smaller than the surface area of the ground electrode of the same size in which the plurality of through holes 52 are not formed.
As a result, the capacitance between each discharge electrode 50 and the ground electrode 51 can be reduced, the time required to reach the discharge potential can be shortened, non-equilibrium plasma can be easily generated, and high-speed electrons can be obtained.

Further, since the earth electrode 51, which is a plate-shaped body in which the plurality of through holes 52 are formed, is formed in a flat plate shape,
A flat plate member that is easily available can be used as the ground electrode 51, whereby the plasma generating means 4 having a simple structure and a low cost can be formed.

Further, by disposing one or a plurality of second ground electrodes in the central portion between the discharge electrodes 50, the area where high-speed electrons can be obtained is increased and the gas processing capability can be improved.

FIG. 13 is a non-equilibrium plasma generating section 27d provided in the purifying apparatus according to the embodiment of the present invention.
14 is a simplified front view showing the discharge electrode 60, the ground electrode 61, and the second ground electrode 63 of FIG. 14, and FIG. 14 is a sectional view taken along the section line XIV-XIV of FIG.
13 and 14, the diameter and width of the discharge electrode 60 and the second ground electrode 63 are shown in an enlarged manner for the sake of simplicity of illustration.

The discharge electrode 60 is made of a conductive material such as steel, and is a linear body having a circular cross section.
In addition, a plurality of them are provided at intervals. Earth electrode 6
Reference numeral 1 denotes a conductive material, for example, steel, which is a corrugated plate-shaped body having a plurality of through holes 62 formed therein, and is disposed on both sides of the plurality of discharge electrodes 60 at regular intervals. . That is, the ground electrode 61 is formed in a so-called mesh shape, and the plurality of discharge electrodes 60 are provided in a plurality of rows in the non-equilibrium plasma generating unit 27d. The positions of the discharge electrodes 60 adjacent to each other are arranged so as to form an equilateral triangle.
The second ground electrode 63 is arranged in the central portion between the discharge electrodes 60 adjacent to each other. Second ground electrode 63
Is made of an electrically conductive material such as steel and has a linear shape with a square cross section. The ground electrode 61 is curved so as to form a part of an imaginary cylindrical surface whose radius is the distance between each discharge electrode 60 and the second ground electrode 63 adjacent to this discharge electrode. The discharge electrode 60 and the second ground electrode 63 are arranged so as to face at least the entire length of the ground electrode 61 in the longitudinal direction.

The gas from which dust has been removed is supplied in the downward direction A of the gas from the lower side to the upper side in FIG. This gas is supplied from the ground electrode 61 side through each through hole 62 to the space 64 between the ground electrodes 61 where non-equilibrium plasma is generated, decomposes and removes odorous components and harmful components in the gas, and decomposes and removes them. The generated gas is discharged from the space 64 through the through holes 62.

Discharge electrode 60, earth electrode 61 and second
As an example of the dimensions of the ground electrode 63 of the discharge electrode 60,
The diameter D1 is selected to be about 1 to 5 mm. The width W of the ground electrode 61 is selected to be about 3 m. The length L2 in the longitudinal direction of the ground electrode 61 is selected to be about 3 to 10 m. The thickness t of the ground electrode 61 is selected to be about 2 mm. The radius R of the curved surface of the earth electrode 61 facing the discharge electrode 60 is
It is selected to be about 125 mm. The length B of one side of the second ground electrode 63 is selected to be about 4 mm. Each discharge electrode 60
The distance d3 between them is selected to be, for example, about 250 mm.
Distance d4 between the discharge electrode 60 and the second ground electrode 63
Is selected to be 125 mm. The distance d5 between each discharge electrode 60 and the ground electrode 61 is selected to be about 125 mm, for example.

Since a plurality of through holes 62 are formed in the ground electrode 61, a space 6 between the ground electrodes 61 where non-equilibrium plasma is generated through the through holes 62 for the gas from which dust has been removed.
4, the odorous components and harmful components in the gas are decomposed and removed, and the decomposed and removed gas can be discharged from the space 64 through the through holes 62. Further, not only the direction parallel to the ground electrode 61 and the direction intersecting the discharge electrode 60 and the direction along each discharge electrode 60, but also the gas from which dust is removed from the ground electrode 61 side in the direction intersecting each discharge electrode 60. Can be processed at high flow rates to treat the gas. Along with this, the ground electrode 61
Can be made smaller than the surface area of the ground electrode of the same size in which a plurality of through holes are not formed. As a result, the capacitance between each discharge electrode 60 and the ground electrode 61 is reduced, the time required to reach the discharge potential is shortened, non-equilibrium plasma is easily generated, and high-speed electrons can be easily obtained. it can.

Further, since the ground electrode 61, which is a plate-shaped body in which the plurality of through holes 62 are formed, is formed in a corrugated plate shape,
A region in which high-speed electrons can be obtained between the discharge electrode 60 and the ground electrode 61 is increased as compared with the case where the ground electrode 61 is formed in a flat plate shape, and gas is generated more than when the ground electrode 61 is formed in a flat plate shape. It is possible to form the plasma generating means 4 with improved processing ability, simple structure, and low cost.

Further, by forming the ground electrode 61 in a corrugated plate shape, the interval between the ground electrodes 61 is made smaller than that in the case where the ground electrode 61 is formed in a flat plate shape, and the corrugated plate ground electrode 61 is formed. The plasma generating means 4 can be arranged, and the size of the plasma generating means 4 can be reduced.

Further, since the second ground electrode 63 is arranged in the central portion between the discharge electrodes 60 adjacent to each other, high-speed electrons can be obtained between the discharge electrode 60 and the ground electrode 61, and the discharge electrode 60 can be obtained. And the second ground electrode 6
High-speed electrons can be obtained even during the period of time 3, and the ability of the plasma generating means 4 to process the gas can be further improved.

In this embodiment, the second ground electrode 63
Is made of a linear body having a quadrangular cross section, but may be made of a linear body having a circular cross section or a strip plate instead. Further, a through hole may be formed in this strip. Furthermore, the second
Although one earth electrode 63 is provided in the central portion between the discharge electrodes 60 adjacent to each other, a plurality of earth electrodes 63 may be provided.

Further, in the present embodiment, the ground electrode 61
Is composed of a corrugated plate-shaped body in which a plurality of through holes 62 are formed. Alternatively, it may be composed of a corrugated plate-shaped plate in which a plurality of through holes are not formed. .

FIG. 15 is a sectional view showing a simplified structure of a purifying apparatus 70 which is an embodiment of the present invention, and FIG. 16 is an enlarged sectional view taken along the section line XVI-XVI of FIG. FIG. 17 is an enlarged vertical sectional view showing a simplified structure near the bag filter 72. In this embodiment, the same reference numerals are given to the portions corresponding to the configurations of the above-described embodiments.

The purifying device 70 comprises a housing 71, a bag filter 72 as a dust collecting means, and a plasma generating means 4
And a dust collecting means 100. The housing 71 is
An end plate 71a extending substantially horizontally and formed in a rectangular shape,
Four side plates 71b extending vertically downward from both ends in the longitudinal direction of the end plate 71a and both ends in the width direction perpendicular to the longitudinal direction are connected to the lower ends of the respective side plates 71b, and are inclined in a direction closer to each other toward the vertically downward direction. Hopper part 73 having a guide surface
Including and

A partition plate 76 is provided on each side plate 71b at a distance from the end plate 71a. The peripheral edge 76a of the partition plate 76 is airtightly fixed to the upper portion of each side plate 71b. A plurality of through holes 79 are formed in the partition plate 76 over the entire surface at intervals. In this way, the internal space 75 of the housing 71 has a first space 77 to which a gas containing dust such as soot is supplied by the partition plate 76,
It is partitioned into a second space 78 to which the gas after the treatment is supplied.

The bag filter 72 is made of glass fiber, for example, and is formed in a bag shape. The upper end portion of the bag filter 72 is externally attached to the attachment means 93 that is airtightly provided on the partition plate 76, so that the bag filter 72 is attached to the partition plate 76.
The inner space of the bag filter 72 and the second space 78 communicate with each other through the through holes 79. Housing 7
1 has an end plate 71a and an upper part 71 of each side plate 71b.
A header 92 is formed by b1, the partition plate 76, and the attachment means 93. Further, below the lower end portion of the bag filter 72 in the lower part of the housing 71, a supply pipeline 80 for supplying a gas containing dust such as soot dust to the first space 77 is connected.

The mounting means 93 is in contact with the cylindrical mounting body 94 extending vertically downward from the peripheral edge of each through hole 79 of the end plate 76 and the outer peripheral surface of the mounting body 94, and the bag filter 72 externally inserted. The net-like reinforcing member 95 that supports the inner peripheral surface of the bag filter 72 and reinforces the bag filter 72 and the outer peripheral surface of the upper portion of the bag filter 72 are contacted, and the bag filter 72 is fastened to the mounting member 94 through the reinforcing member 95. And a holding body 96 for holding. A packing 97 is interposed between the upper end surface of the bag filter 72 and one surface of the partition plate 76 facing the lower side, and an airtight state between the first space 77 and the second space 78 which is an internal space of the header 92 is provided. Hold.

The plasma generating means 4 includes a non-equilibrium plasma generating section 27 for generating non-equilibrium plasma, and the non-equilibrium plasma generating section 27 has a plurality of discharges having the same configurations as those shown in FIGS. 3 and 4. It includes an electrode 40, a plurality of ground electrodes 41, and a power supply 98. The bag filters 72 surround the ground electrodes 41 and are provided at intervals so as not to contact each other.

The air guiding means 74 has at least the mounting means 93.
, Header 92, first conduit 81, and suction fan 82
And a second conduit 83 and a first opening / closing valve 90. Strictly speaking, the air guiding means 74 includes the supply pipeline 80, the housing 71 including the header 92, the mounting means 93, and the first pipeline 81.
A suction fan 82, a second conduit 83, and a first opening / closing valve 9
0, the second opening / closing valve 86, the third conduit 84, and the plurality of third
An on-off valve 87 and a plurality of fourth conduits 85 are included.

One end of the first conduit 81 has a header 92.
Of the second space 78 in the header 92 by connecting the other end to the supply port of the suction fan 82.
Communicates with the space inside the suction fan 82. Suction fan 8
The second conduit 83 is connected to the second exhaust port. The third conduit 84 is connected to the second conduit 83 on the downstream side in the gas flow direction. Further, a first opening / closing valve 90 is interposed in the second pipeline 83 on the downstream side in the gas flow direction with respect to a connection position 89 between the second pipeline 83 and the third pipeline 84.

One end of the third conduit 84 is the third conduit 84.
A plurality of fourth tubes that are respectively connected to the downstream side in the downflow direction and face the space 43 surrounded by the ground electrodes 41, which is the space between the discharge electrode 40 and the ground electrode 41 at the other end. A path 85 is provided. Third conduit 84
A second opening / closing valve 86 is provided on the upstream side of the gas flow direction. A third opening / closing valve 87 is interposed in each of the fourth conduits 85. The dust collecting means includes a bag filter 72 and the air introducing means 74 described above.

The dust collecting means 100 includes the hopper section 73.
, Screw conveyor 101, and rotary feeder 1
02 and a discharge port 103. Screw conveyor 1
01 is provided in the lower part of the hopper unit 73, and is driven to rotate about a horizontal axis perpendicular to the paper surface of FIG.
The dusts stored in are discharged to the discharge port 73a. The rotary feeder 102 is provided below the discharge port 73a of the hopper 73. Further, the rotary feeder 102 has a rotary valve 107 provided with a rotor 106 which is rotationally driven in a casing 105, and a motor 108 which rotationally drives the rotor 106 at a predetermined rotational speed. Further, the rotary feeder 102 includes the screw conveyor 10
The dust transferred by the rotary feeder 102
It is transferred to and discharged from the discharge port 103 provided below.
More specifically, the screw conveyor 101 is driven regularly or when a predetermined storage amount is reached, forcibly discharging powder particles containing dust by the screw conveyor 101 and guiding them to the rotary feeder 102, and the casing 105. The gas inside can be discharged from the discharge port 103 without leaking.

The first opening / closing valve 90 is opened and the second opening / closing valve 8 is opened.
When the suction fan 82 is operated while the 6 and each third on-off valve 87 are closed, the pressure in the second space 78, which is a space inside the header 92, becomes a negative pressure, and the bag filter 72
The space surrounded by is made negative pressure, and the gas containing dust such as soot is supplied to the first space 77 from the supply pipeline 80. The supplied gas is guided from the periphery of the bag filter 72 to the bag filter 72, and the bag filter 72 removes dust such as soot and dust from the gas. The gas from which dust such as soot has been removed is guided to the space 43 surrounded by the ground electrode 41. The gas introduced into the space 43 surrounded by the ground electrode 41 decomposes and removes odorous components and harmful components in the gas from which dust has been removed by the non-equilibrium plasma generated between the discharge electrode 40 and the ground electrode 41. The gas after this treatment, that is, clean air, is guided upward in the axial direction of the ground electrode 41 and is guided to the second space 78 through the through hole 79, the first conduit 81, and the suction fan 82.
And it is discharged to a predetermined discharge position 88 via the second conduit 83 and the first opening / closing valve 90.

In order to collect the dust collected by the bag filter 72, the first opening / closing valve 90 is closed and the second opening / closing valve 8 is closed.
Bag filter 7 that tries to collect dust by opening 6
The third opening / closing valve 87 corresponding to 2 is opened. As a result, the clean air flowing through the second pipe line 83 passes through the third pipe line 84.
Is guided to the selected fourth pipeline 85 via the selected third opening / closing valve 87, and is guided to the space 43 surrounded by the ground electrode 41. The clean air guided to the space 43 is discharged from the inside to the outside of the bag filter 72 and blows off the dust trapped in the bag filter 72. The dust blown off is stored in the hopper 73 by being dropped, and then discharged through the rotary feeder 102.
Recovered from 03.

The dust collecting means is a bag filter 72 surrounding the earth electrode 41, and the dust collecting means is the earth electrode 4
A predetermined discharge position 8 from the space 43 surrounded by 1
8 includes the gas guiding means 74 for guiding the processed gas, the suction fan 82 of the gas guiding means 74 causes the inside of the bag filter 72 to have a negative pressure, so that the gas containing dust such as soot dust around the bag filter 72 is bagged. The dust-removed gas is guided to the filter 72 and is guided to the space 43 surrounded by the ground electrode 41. Thereby, the discharge electrode 40 and the ground electrode 41
The non-equilibrium plasma generated in between decomposes and removes the odorous components and harmful components in the gas from which the dust has been removed, guides the gas after this treatment in the direction along the axis of the earth electrode 41, and determines the predetermined discharge position 88. Can lead to. Further, by providing the bag filter 72 around the earth electrode 41, the structure is simplified as compared with the embodiment of the present invention shown in FIGS. 1 to 14, and the dust collecting means is provided near the plasma generating means 4. Can be placed in As a result, the purification device 70 can be downsized as compared with the embodiment of the present invention shown in FIGS.
Further, since the dust-containing gas guided to the bag filter 72 is guided from around the bag filter 72, the dust can be collected almost uniformly regardless of the installation position of the bag filter 72. At the same time, the treated gas is guided to the air guiding means 74, so that the air guiding means 74, particularly the suction fan 82, is less likely to be contaminated.

In the embodiment shown in FIGS. 1 to 17, the discharge electrodes 40, 50, 60, 110, 130, the ground electrodes 41, 51, 61, 111, 131 and the second ground electrode 63 are made of steel. However, it may alternatively be made of another electrically conductive material such as copper or aluminum.

The ground electrodes 41, 51, 61 may be formed by punching the through holes 42, 52, 62 into a plate-like body by machining, or the ground electrodes 41, 51, 61.
Alternatively, a lath plate or a wire mesh may be used.

In the embodiment shown in FIGS. 3 and 4 and FIGS. 11 to 17, the discharge electrodes 40, 50, 6 are provided.
Although 0 has a circular cross-sectional shape, it is not limited to this and may have another shape such as an annular shape or a polygonal shape.

In the embodiment of the present invention shown in FIGS. 5 to 10, the spiral body 112 and the ring-shaped body 132 forming the ground electrodes 111 and 131 are made of a linear body having a circular cross section. However, instead of this, it may be formed of a band-shaped body having a rectangular cross section. At this time, the length of the long side in the cross section of the strip is selected to be about 10 to 20 mm, and the length of the short side is selected to be about 2 to 3 mm.

In the embodiment of the present invention shown in FIGS. 5 to 10, the discharge electrodes 110 and 130 have a square cross section, but the shape is not limited to this, and the discharge electrodes 110 and 130 are not limited to the circular, annular and polygonal shapes. Other shapes such as

Further, in the embodiment of the present invention shown in FIGS. 5 to 10, the ground electrodes 111 and 131 are arranged at a distance from each other, but as still another embodiment of the present invention, The ground electrodes 111 and 131 may be arranged in contact with each other. With this configuration, the dust-removed gas containing the odorous component and the harmful component can be reliably supplied to the ground electrodes 111, 13.
1 can be passed and the gas can be reliably processed. As a result, the processing efficiency of the gas can be improved. Along with this, each ground electrode 111, 1
31 does not need to be individually grounded, and the configuration can be simplified.

Further, in the embodiment of the present invention shown in FIGS. 5 to 10, the ground electrodes 111 and 131 are formed in a substantially cylindrical shape, but the present invention is not limited to this, and each of the ground electrodes is generally formed. Other shapes such as a tubular shape may be used.

In the embodiment of the present invention shown in FIGS. 8 to 10, each of the ring-shaped bodies 132 of the ground electrode 131 is formed in a circular ring shape.
Are arranged so that the central axis line of the is coaxial with the axis line of the discharge electrode 130 and are fixed to the holding members 133. It may be formed in a ring shape, arranged so that the central axis of each ring-shaped body intersects the axis of the discharge electrode 130, and fixed to each holding member 133. With this structure, the ground electrode can be formed into a substantially cylindrical shape. At the same time, the gas can reliably pass through each discharge region between the discharge electrode 130 and the ground electrode, and the gas can be reliably treated. At this time, the interval between the ring-shaped bodies may be selected as p2.

In the embodiment shown in FIGS. 3 to 10, the discharge electrodes 40, 110, 130 are made of linear bodies, but the present invention is not limited to this, and they may be made of spiral bodies, for example. Good. With this configuration, the area occupied by the discharge electrodes in the spaces 43, 114, 134 surrounded by the ground electrodes 41, 111, 131 increases. Since the distance between the discharge electrode and the ground electrodes 41, 111, 131 does not change with respect to a predetermined voltage applied between the discharge electrode and the ground electrode, the area occupied by the discharge electrode in the spaces 43, 114, 134 is reduced. With the increase, the diameter of the ground electrode can be increased. Therefore, the non-equilibrium plasma generators 27, 2
The number of discharge electrodes and ground electrodes 41, 111, 131 provided in 7a, 27a1, 27b, 27b1 is reduced, and the configuration can be simplified.

In the embodiments of the present invention shown in FIGS. 15 to 17, the bag filters 72 are provided so as to surround the ground electrodes 41, respectively. As a form, a plurality of ground electrodes 41
You may provide one bag filter 72 so that it may surround. With this configuration, the bug filter 72
The installation work of becomes easy.

In the embodiment of the present invention shown in FIGS. 15 to 17, the dust collected in the bag filter 72 is removed from the bag filter 72 by guiding it to a predetermined discharge position 88. The clean air is guided to the space 43 surrounded by the ground electrode 41 and is discharged from the inside to the outside of the bag filter 72. Instead, the bag filter 72 is vibrated to remove dust. May be removed.

Further, in the embodiment which is the basis of the present invention shown in FIG. 15 to FIG. 17, the gas containing dust such as soot dust sucks the clean air in the header 92 by the suction fan 82, and the gas inside the header 92 is sucked. Although the negative pressure is supplied to the first space 77, instead of this, a blower fan is provided on the upstream side of the gas in the supply pipeline 80 in the downstream direction, and the header 92 is opened to the atmosphere to release the gas. It may be supplied to one space 77. Further, the gas may be supplied to the first space 77 by the exhaust pressure of the gas without using a blower fan.

Further, in the embodiment which is the basis of the present invention shown in FIGS. 15 to 17, the bag filter 72 is provided so as to surround the cylindrical ground electrode 41. In the embodiment of the invention, the spiral electrodes or the ring electrodes shown in FIGS.
It is provided by surrounding 31.

[0133]

According to the present invention, the dust collecting means collects and removes dust from a gas containing dust such as soot, for example, dust containing soot and air containing odorous components and harmful components,
Since only the gas from which dust has been removed is supplied to the plasma generation means, the plasma generated by the discharge causes
It is possible to decompose and remove odorous components and harmful components in the gas from which dust has been removed, does not require cleaning of the plasma generation means, etc., and facilitates maintenance and management of the purification device with a simple configuration. You can

The plasma generating means ionizes the gas between the discharge electrode and the ground electrode into electrons and ions by discharge, and the electrons and ions are thermodynamically kept in a state where the electron temperature of the electrons is higher than the ion temperature of the ions. Since it generates a non-equilibrium plasma which is a plasma in the state of not being balanced,
High-speed electrons can be obtained while the temperature of the gas in the plasma atmosphere between the electrodes generated by the discharge is kept at room temperature, and these high-speed electrons can remove odorous and harmful components in the gas from which dust has been removed. It is possible to remove the odorous component and the harmful component in the gas by causing a chemically active species having a high reactivity to generate a chemical reaction. Further, since the temperature of the gas in the plasma atmosphere between the electrodes generated by the discharge is kept at room temperature, it is not necessary to provide the plasma generating means with a cooling means or the like. Further, the temperature of the gas discharged from the plasma generating means is also kept at room temperature, high temperature gas is not discharged unlike the case of using thermal plasma, and it is not necessary to provide a cooling means for the discharged gas. The configuration can be simplified.

Since the ground electrode extends along the axis of the discharge electrode and is formed in a spiral shape or a ring shape having a substantially constant inner diameter with the discharge electrode as the center, the distance between the discharge electrode and the ground electrode is reduced. It can be kept constant and the discharge distance can be kept with high accuracy. Also, the production of the earth electrode is easy, and the discharge area between the discharge electrode and the earth electrode where high-speed electrons are obtained is
It is formed in a spiral shape or a ring shape. Therefore, the gas containing the odorous component and the harmful component from which dust has been removed can be reliably treated by passing the gas in either the axial direction of the earth electrode or the direction intersecting the axial direction. At the same time, the surface area of the ground electrode can be made smaller than the surface area of the ground electrode of the same size formed in a cylindrical shape, for example.
As a result, the capacitance between the discharge electrode and the ground electrode can be reduced, the time required to reach the discharge potential can be shortened, non-equilibrium plasma can be easily generated, and high-speed electrons can be obtained.

[0136]

[0137]

[0138]

[0139]

[0140]

According to the present invention, since the dust collecting means is a bag filter which surrounds the earth electrode, a gas containing dust such as soot dust is guided to the bag filter from the periphery of the bag filter, and the soot dust and the like are caused by the bag filter. Of the odor component in the gas from which dust is removed by the plasma generated between the discharge electrode and the ground electrode. It can decompose and remove harmful components. Further, since the dust-containing gas introduced to the bag filter is introduced from around the bag filter, the dust can be collected almost uniformly regardless of the installation position of the bag filter.

According to the present invention, the treated gas is introduced into the air introducing means, so that the air introducing means is less contaminated. In particular, since the dust collecting means includes the gas guiding means for guiding the treated gas from the space between the discharge electrode and the ground electrode to the predetermined discharge position, the gas guiding means allows dust such as soot and dust around the bag filter. The gas containing the gas is guided to the bag filter, dust such as soot and dust is collected by the bag filter, and the gas from which the dust is removed is guided to the space between the discharge electrode and the ground electrode,
The odorous and harmful components in the gas from which dust has been removed by the plasma generated between the discharge electrode and the ground electrode are decomposed and removed, and the gas after this treatment is guided, for example, in the direction along the axis of the ground electrode to a predetermined discharge position. Can lead to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a simplified configuration of a purification device 1 that is an embodiment that is the basis of the present invention.

FIG. 2 is a waveform diagram of a pulse voltage applied between a discharge electrode and a ground electrode.

FIG. 3 is a simplified front view showing a discharge electrode 40 and a ground electrode 41 of a non-equilibrium plasma generation part 27 provided in the purification device 1.

FIG. 4 is a sectional view taken along the section line IV-IV in FIG.

FIG. 5 is a simplified front view showing a discharge electrode 110 and a ground electrode 111 of a non-equilibrium plasma generating unit 27a included in the purifying apparatus according to the embodiment of the present invention.

FIG. 6 is a plan view showing a part of a non-equilibrium plasma generating unit 27a.

FIG. 7 is a plan view showing a part of a non-equilibrium plasma generating unit 27a1 included in a purifying apparatus according to another embodiment of the present invention.

FIG. 8 is a discharge electrode 1 of a non-equilibrium plasma generating unit 27b provided in a purifying apparatus according to still another embodiment of the present invention.
It is a front view which simplifies and shows 30 and the earth electrode 131.

FIG. 9 is a plan view showing a part of a non-equilibrium plasma generating unit 27b.

FIG. 10 is a plan view showing a part of a non-equilibrium plasma generating unit 27b1 provided in a purifying apparatus according to still another embodiment of the present invention.

FIG. 11 is a simplified front view showing a discharge electrode 50 and a ground electrode 51 of a non-equilibrium plasma generating unit 27c included in a purifying apparatus that is an embodiment that is the basis of the present invention.

12 is a cross-sectional view taken along the section line XII-XII in FIG.

FIG. 13 is a discharge electrode 60, a ground electrode 61 and a second ground electrode 6 of the non-equilibrium plasma generating unit 27d provided in the purifying apparatus according to the embodiment which is the basis of the present invention.
It is sectional drawing which simplifies and shows 3.

14 is a cross-sectional view taken along the section line XIV-XIV in FIG.

FIG. 15 is a cross-sectional view showing a simplified configuration of a purifying device 70 that is an embodiment that is the basis of the present invention.

16 is an enlarged cross-sectional view taken along the section line XVI-XVI of FIG.

FIG. 17 is an enlarged vertical sectional view showing a simplified configuration around the bag filter 72.

[Explanation of symbols]

1,70 Purification device 3 Dust collection means 4 Plasma generation means 40, 50, 60, 110, 130 Discharge electrodes 41, 51, 61, 111, 131 Ground electrode 42, 52, 62 through hole 43,114,134 Space in the ground electrode 63 Second ground electrode

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-312115 (JP, A) JP-A-4-363115 (JP, A) JP-A-2-227117 (JP, A) JP-A-5- 309231 (JP, A) JP 7-116460 (JP, A) JP 8-155249 (JP, A) JP 7-265653 (JP, A) JP 7-265655 (JP, A) JP-A-11-128657 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 53/34-53/75 B01D 53 / 32,46 / 42 B01J 19/08 H05H 1 / 46

Claims (6)

(57) [Claims] 1. A gas containing dust such as soot is supplied,
The discharge device includes a dust collecting unit that collects and removes dust from the gas, and a plasma generating unit that is supplied with the dust-free gas and that generates a non-equilibrium plasma by the discharge between the discharge electrode and the ground electrode. The purification device is characterized in that the electrode is made of a linear body, and the ground electrode extends along an axis of the discharge electrode and has a spiral shape having a substantially constant inner diameter with the discharge electrode as a center. 2. The ground electrode extends along an axis of the discharge electrode, and has a spiral shape having a substantially constant inner diameter and a substantially constant pitch p1 about the discharge electrode, and The purification apparatus according to claim 1, comprising a plurality of holding members that extend along an axis of the discharge electrode, are fixed to an outer peripheral portion of the spiral body, and hold a pitch p1 of the spiral body. . 3. A gas containing dust such as soot is supplied,
The discharge device includes a dust collecting unit that collects and removes dust from the gas, and a plasma generating unit that is supplied with the dust-free gas and that generates a non-equilibrium plasma by the discharge between the discharge electrode and the ground electrode. The electrode comprises a linear body, the ground electrode extends along the axis of the discharge electrode,
A plurality of ring-shaped bodies which are formed in a ring shape having a substantially constant inner diameter with the discharge electrode as a center and are arranged at a substantially constant interval p2 along the axis of the discharge electrode, and the outer periphery of each ring-shaped body. A purification device comprising a plurality of holding members fixed to a portion and holding a space p2 between the ring-shaped bodies. 4. The plasma generating means includes a housing for accommodating a plurality of sets of a discharge electrode and a ground electrode so as to be arranged in a zigzag pattern at intervals, and a baffle plate is provided on an inner peripheral surface of the housing. The purification device according to claim 1, wherein the purification device is provided. 5. The dust collecting means is a bag filter which surrounds the earth electrode.
The purifying device according to any one of 1. 6. The dust collecting means includes an air guiding means for guiding the treated gas from a space between the discharge electrode and the ground electrode to a predetermined discharge position.
The purifier according to any one of 5 to 5.