JP7133161B2 - Deodorizing system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a deodorizing system, and more particularly to a deodorizing system using electromagnetic waves.

Conventionally, chemical cleaning methods, adsorption methods, biological deodorization methods, and the like are known as methods for deodorizing gas containing odorous components such as exhaust gas.

Specifically, for example, Patent Literature 1 discloses a deodorizing device that uses zeolite containing a predetermined metal as an adsorbent to deodorize excrement odors by an adsorption method. Then, in the deodorizing device described in Patent Document 1, when removing odorous components that cause manure odor, a waveguide that generates electromagnetic waves is used to heat the adsorbent, thereby adsorbing the odorous components. It regenerates the agent and efficiently deodorizes manure odor.

Japanese Patent Application Laid-Open No. 2001-321424

However, the above conventional deodorizing device has room for improvement in terms of further increasing the deodorizing efficiency.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a deodorizing system having excellent deodorizing efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to advantageously solve the above problems. It is characterized by comprising an electromagnetic wave irradiation part for irradiation and a deodorizing part for bringing the gas to be treated irradiated with the electromagnetic waves by the electromagnetic wave irradiation part into contact with the deodorizing material. By providing the electromagnetic wave irradiation section and the deodorizing section in this manner and bringing the gas to be processed into contact with the deodorizing material after the electromagnetic wave irradiation, the gas to be processed can be efficiently deodorized.

Here, it is preferable that the deodorizing system of the present invention has a humidifying device for humidifying the gas to be treated on the upstream side of the electromagnetic wave irradiation section. If a humidifying device is provided on the upstream side of the electromagnetic wave irradiation section, the humidified gas to be treated can be supplied to the electromagnetic wave irradiation section, so that the gas to be treated can be efficiently subjected to electromagnetic wave treatment, and the deodorization efficiency can be further increased. .

Further, the deodorizing system of the present invention preferably has a heating device for heating the gas to be treated on the upstream side of the electromagnetic wave irradiation section. If a heating device is provided on the upstream side of the electromagnetic wave irradiation section, the heated gas to be treated can be supplied to the electromagnetic wave irradiation section, so that the gas to be treated can be efficiently subjected to electromagnetic wave treatment and the deodorization efficiency can be further enhanced. .

Here, in the deodorizing system of the present invention, the deodorizing material may be liquid. If a liquid deodorizing material is used, it is possible to efficiently absorb the odorous components contained in the gas to be treated.

The liquid is preferably an aqueous solution of a polymer flocculant. If an aqueous solution of a polymer flocculant is used as the deodorizing material, the malodorous components contained in the gas to be treated can be absorbed more efficiently.

Moreover, it is preferable that the deodorizing system of the present invention further includes a liquid electromagnetic wave irradiation device for irradiating the liquid with electromagnetic waves. By irradiating electromagnetic waves not only on the gas to be treated but also on the liquid used as the deodorizing material, it is possible to more efficiently absorb the odorous components contained in the gas to be treated.

Furthermore, in the deodorizing system of the present invention, the deodorizing material may be a porous member. If a porous member is used as a deodorizing material, it is possible to efficiently adsorb odorous components contained in the gas to be treated.

According to the deodorizing system of the present invention, it is possible to efficiently deodorize the gas to be treated that contains malodorous components.

It is an explanatory view showing a schematic structure of an example of a deodorizing system according to the present invention. 1 is an explanatory diagram showing a schematic configuration of a deodorizing system used in Examples 1-4 and Comparative Examples 1-2. FIG. FIG. 2 is an explanatory diagram showing a schematic configuration of a deodorizing system used in Examples 5-7 and Comparative Examples 3-4.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In addition, in each figure, the thing which attached|subjected the same code|symbol shall show the same component.

The deodorizing system of the present invention is not particularly limited, and can be used to deodorize a gas to be treated containing odorous components.

Here, the odor component is not particularly limited, and examples thereof include hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, butyric acid, valeric acid, ammonia, trimethylamine, acetaldehyde, formaldehyde, toluene, styrene, xylene, propion. acid, ethyl acetate, butyl acetate, methyl isobutyl ketone, methyl ethyl ketone, isobutanol, propionaldehyde, normal butyraldehyde, isobutyraldehyde, normal valeraldehyde, isovaleraldehyde, acrolein, indole, skatole, hexane, acetone and the like.

In addition, the gas to be treated is not particularly limited. Exhaust gas generated in various factories; Exhaust gas generated in various treatment plants such as sewage treatment plants, night soil treatment plants, and garbage disposal plants; Exhaust gas generated in small-scale facilities such as restaurants, public toilets, and building pits; Medical facilities, research facilities, and analysis facilities , exhaust gas generated in various facilities such as livestock facilities;

The deodorizing system of the present invention comprises an electromagnetic wave irradiation unit for irradiating the gas to be treated with electromagnetic waves, and a deodorizing unit for bringing the gas to be treated, which has been irradiated with electromagnetic waves by the electromagnetic wave irradiation unit, into contact with a deodorizing material. A humidifying device that humidifies the processing gas and/or a heating device that heats the gas to be processed is further provided on the upstream side of the electromagnetic wave irradiation section.

Specifically, as shown in FIG. 1, an example of the deodorizing system of the present invention includes a humidifying device 10 and a heating device 20 arbitrarily provided on the upstream side of an electromagnetic wave irradiation unit 30, an electromagnetic wave irradiation unit 30, an electromagnetic wave A deodorizing section 40 provided on the rear stage side of the irradiation section 30 is provided. In the deodorizing system 100 shown in FIG. 1, the heating device 20 is provided on the rear side of the humidifying device 10, but in the deodorizing system of the present invention, the heating device 20 may be provided on the front side of the humidifying device 10. Alternatively, instead of the separately provided humidifying device 10 and heating device 20, a device that simultaneously heats and humidifies the gas to be treated may be used.

Here, the humidifier 10 is not particularly limited as long as it can humidify the gas to be processed, and any humidifier such as a vaporization humidifier, a water spray humidifier, and a steam humidifier can be used. be able to. If the humidity of the gas to be treated is excessively low, static electricity is likely to be generated. Therefore, the effect of improving the deodorizing efficiency is reduced. However, if the humidifying device 10 is provided on the upstream side of the electromagnetic wave irradiation unit 30, the humidity of the gas to be treated can be sufficiently increased and the deodorization efficiency can be improved even in an environment where the gas to be treated tends to be low in humidity, such as in winter. can be improved enough. From the viewpoint of good electromagnetic wave treatment of the gas to be treated in the electromagnetic wave irradiation unit 30, it is preferable that the humidity of the gas to be treated supplied to the electromagnetic wave irradiation unit 30 is 35% RH or higher.
The water used for humidifying the gas to be processed may be irradiated with electromagnetic waves. The device for irradiating the water used for humidifying the gas to be treated with electromagnetic waves is not particularly limited, and the same device as the electromagnetic wave irradiation device that can be used in the electromagnetic wave irradiation unit 30 and will be described later can be used. .

The heating device 20 is not particularly limited as long as it can heat the gas to be treated, and any heating device such as a coil heater, band heater, mantle heater, etc. can be used. If the temperature of the gas to be treated is excessively low, the humidity tends to decrease, so even if the gas to be treated is irradiated with electromagnetic waves, the components contained in the gas to be treated cannot be effectively treated with electromagnetic waves, and the deodorizing efficiency is reduced. Improvement effect is reduced. However, if the heating device 20 is provided on the upstream side of the electromagnetic wave irradiation unit 30, the temperature of the gas to be treated can be sufficiently increased and the deodorization efficiency can be sufficiently improved even in an environment where the gas to be treated tends to be low in temperature, such as in winter. can be improved to From the viewpoint of good electromagnetic wave treatment of the gas to be treated in the electromagnetic wave irradiation unit 30, the temperature of the gas to be treated supplied to the electromagnetic wave irradiation unit 30 is preferably 10° C. or higher.

Further, in the electromagnetic wave irradiation unit 30, any electromagnetic wave irradiation device can be used to irradiate the gas to be processed with electromagnetic waves without any particular limitation as long as it is possible to irradiate the gas to be processed with electromagnetic waves.

Here, as the electromagnetic wave irradiation device, for example, an electromagnetic wave oscillating section for irradiating an electromagnetic wave to the gas to be processed is electrically connected to the electromagnetic wave oscillating section, and an electromagnetic wave is generated by passing an alternating current through the electromagnetic wave oscillating section. A device with an alternating current generator can be used. The electromagnetic wave oscillator is not particularly limited, and a coil or the like can be used, for example. In addition, the coil may be installed in a flow path of the gas to be treated such as a duct, or may be formed by winding a conductive wire around the outer periphery of the flow path of the gas to be treated such as a duct. In addition, the AC current generator is not particularly limited. can be used. Among them. The alternating current generator includes an alternating current generator that generates an alternating current such as a square wave or a sine wave whose frequency changes over time, as well as an alternating current with a single frequency or two or more single waves with different frequencies. It is preferable to use an alternating current generator that generates an alternating current with a frequency, and more preferably an alternating current generator that generates an alternating current with a single frequency or two or more alternating currents with a single frequency that are different from each other. preferable. The frequency of the alternating current generated by the alternating current generator is not particularly limited, and can be, for example, 10 Hz or more and 1 MHz or less. Moreover, the magnetic flux density of the generated electromagnetic wave is preferably 10 mG or more. The magnetic flux density can be measured on the electromagnetic wave oscillator (for example, on the cable forming the coil).

Then, in the deodorizing section 40, the gas to be treated which has been irradiated with electromagnetic waves by the electromagnetic wave irradiation section 30 is brought into contact with a deodorizing material to remove odorous components contained in the gas to be treated. In the deodorizing unit 40, the gas to be treated that has been irradiated with electromagnetic waves comes into contact with the deodorizing material, so that odorous components are removed more efficiently than in the case where the gas to be treated is not irradiated with electromagnetic waves. Although the reason for this is not clear, it is presumed that the irradiation of the electromagnetic waves changes the zeta potential of the components contained in the gas to be treated.

Here, as the deodorizing material, any deodorizing material can be used, such as a liquid deodorizing material that absorbs and removes malodorous components, or a solid deodorizing material that absorbs and removes malodorous components. Specifically, as the liquid deodorizing material, for example, water, an aqueous solution of a polymer flocculant, or the like can be used. preferable. Examples of solid deodorizing materials include structures formed by processing inorganic fiber sheets made of inorganic fibers such as ceramic fibers into a honeycomb shape, activated carbon, zeolite, silica, apatite, metal organic structures, polymer adsorbents, and the like. A porous member can be used.

The contact between the gas to be treated and the deodorizing material can be achieved by spraying or spraying the liquid deodorizing material into the flow path of the gas to be treated, such as a duct, or by pouring the gas to be treated into a container filled with the solid deodorizing material. Any technique, such as aeration, can be used.

When a liquid deodorizing material is used in the deodorizing unit 40, it is preferable to provide a liquid electromagnetic wave irradiation device (not shown) for irradiating the liquid with electromagnetic waves before contacting the gas to be treated. If an electromagnetic wave irradiation device for liquid is provided and the liquid irradiated with the electromagnetic wave is brought into contact with the gas to be treated, the malodorous components contained in the gas to be treated can be absorbed more efficiently. Here, the electromagnetic wave irradiation device for liquid is not particularly limited, and a device similar to the device exemplified as the electromagnetic wave irradiation device that can be used in the electromagnetic wave irradiation section 30 can be used.

Further, when an aqueous solution of a polymer flocculant is used as the liquid deodorant, the polymer flocculant may be an amphoteric polymer flocculant or a component in the gas to be treated by irradiation with electromagnetic waves in the electromagnetic wave irradiation unit 30. It is preferable to use a polymer flocculant having a charge opposite to the zeta potential to be imparted, and a high polymer flocculant having a charge opposite to the zeta potential imparted to the components in the gas to be treated by the irradiation of the electromagnetic waves in the electromagnetic wave irradiation unit 30. More preferably, a molecular flocculant is used.

Although the deodorizing system of the present invention has been described above, the deodorizing system of the present invention is not limited to the contents described above.

EXAMPLES The present invention will be described in more detail below using examples, but the present invention is not limited to these examples.

(Example 1)
Using the deodorizing system 100A shown in FIG. 2, the electrostatic coating booth exhaust gas as the gas to be treated was deodorized under the following conditions.
Here, the deodorizing system 100A includes an exhaust duct 50 having a cross section of 900 mm square, a coil 31 formed by winding a conductive wire around the exhaust duct 50, and an alternating current generator 32 that generates an electromagnetic wave by passing an alternating current through the coil 31. and a deodorizing unit 40 for spraying an aqueous polymer flocculant solution as a deodorant into the exhaust duct 50 on the downstream side of the electromagnetic wave irradiating unit 30 . The deodorizing system 100</b>A also has a drain (not shown) as a mechanism for collecting the polymer coagulant aqueous solution sprayed into the exhaust duct 50 .
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Table 1 shows the results.
<Deodorization conditions>
・ Outside air humidity: 43% RH
・Outside temperature: 10℃
・Humidity in exhaust duct: 48% RH
・Temperature inside exhaust duct: 15℃
・ Exhaust gas flow rate: 175 m ³ /min (flow velocity: 3.6 m / sec)
・AC current frequency: 6 kHz and 6.5 kHz
・Zeta potential imparted by electromagnetic waves: negative ・Polymer flocculant: acrylamide-based amphoteric polymer flocculant ・Polymer flocculant aqueous solution concentration: 0.2 to 0.33%
・Polymer flocculant aqueous solution spray amount: 16 mL/m ³ -exhaust gas

(Example 2)
The electrostatic coating booth exhaust gas as the gas to be treated was deodorized in the same manner as in Example 1, except that the deodorizing conditions were changed to the following conditions.
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Table 1 shows the results.
<Deodorization conditions>
・ Outside air humidity: 43% RH
・Outside temperature: 10℃
・Humidity in exhaust duct: 48% RH
・Temperature inside exhaust duct: 15℃
・ Exhaust gas flow rate: 175 m ³ /min (flow velocity: 3.6 m / sec)
・AC current frequency: 0.5 kHz and 1 kHz
・Zeta potential imparted by electromagnetic waves: positive ・Polymer flocculant: acrylamide-based amphoteric polymer flocculant ・Polymer flocculant aqueous solution concentration: 0.2 to 0.33%
・Polymer flocculant aqueous solution spray amount: 16 mL/m ³ -exhaust gas

(Comparative example 1)
The electrostatic coating booth exhaust gas as the gas to be treated was deodorized in the same manner as in Example 1, except that the electromagnetic wave irradiation unit 30 did not irradiate the electromagnetic wave.
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Table 1 shows the results.

(Example 3)
Using the deodorizing system 100A having the same configuration as that used in Example 1 except that the cross-sectional dimension of the exhaust duct 50 is 400 mm square, the hot air drying furnace (heat source: LPG) exhaust gas as the gas to be treated is treated as follows. was deodorized under the conditions of
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Also, the VOC (volatile organic compound) concentrations of the gas to be treated and the gas to be treated were measured with a VOC monitor (MiniRAE 3000 manufactured by RAE) to determine the VOC removal rate. Table 2 shows the results.
<Deodorization conditions>
・ Outside air humidity: 43% RH
・Outside temperature: 10℃
・Humidity inside the duct: 94% RH
・Temperature inside the duct: 170℃
・ Exhaust gas flow rate: 30 m ³ /min (flow velocity: 3.2 m / sec)
・AC current frequency: 6 kHz and 6.5 kHz
・Zeta potential imparted by electromagnetic waves: negative ・Polymer flocculant: acrylamide-based amphoteric polymer flocculant ・Polymer flocculant aqueous solution concentration: 0.2 to 0.33%
・Polymer flocculant aqueous solution spray amount: 17.4 mL/m ³ -exhaust gas

(Example 4)
Exhaust gas from a hot-air drying furnace as the gas to be treated was deodorized in the same manner as in Example 3, except that the polymer flocculant was changed to an acrylamide-based cationic polymer flocculant.
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Table 2 shows the results.

(Comparative example 2)
The hot-air drying furnace exhaust gas as the gas to be treated was deodorized in the same manner as in Example 3, except that the electromagnetic wave irradiation unit 30 did not irradiate the electromagnetic wave.
Then, the odor concentration of the gas to be treated and the gas to be treated was measured with an odor sensor (XP-329, manufactured by New Cosmos Electric) to obtain the odor removal rate. Also, the VOC (volatile organic compound) concentrations of the gas to be treated and the gas to be treated were measured with a VOC monitor (MiniRAE 3000 manufactured by RAE) to determine the VOC removal rate. Table 2 shows the results.

(Example 5)
The deodorizing system 100B shown in FIG. 3 was used to deodorize the kitchen exhaust as the gas to be treated under the following conditions.
Here, the deodorizing system 100B includes a flexible duct 61 with a diameter of 100 mm connected to the kitchen duct 60, a coil 31 formed by winding a conductive wire around the flexible duct 61, and an alternating current that generates electromagnetic waves by passing an alternating current through the coil 31. An electromagnetic wave irradiation unit 30 consisting of a current generator 32, a flexible duct 62 connected to the latter side of the flexible duct 61 via an exhaust fan 70, and a vinyl chloride resin container 41 (width 315 mm × height 315 mm × depth 1000 mm). ), a deodorizing section 40 in which three structures 42 (width 200 mm×height 200 mm×thickness 60 mm) formed by processing a ceramic fiber sheet into a honeycomb shape as a deodorizing material are installed in a deodorizing section 40, and a rear stage side of the deodorizing section 40. and a flexible duct 63 connected to the
Then, the odor concentrations of the gas to be treated and the gas to be treated were measured by the three-point comparison type odor bag method to obtain the odor removal rate. Table 3 shows the results.
<Deodorization conditions>
・Outdoor humidity: 48% RH
・Outside temperature: 5℃
・Humidity inside the duct: 75% RH
・Temperature inside the duct: 28℃
・Exhaust temperature: 21℃
・Exhaust volume: 0.94 m ³ /min (flow velocity: 2.0 m / sec)
・AC current frequency: 6 kHz and 6.5 kHz
・Zeta potential given by electromagnetic waves: Minus

(Comparative Example 3)
Kitchen exhaust as the gas to be treated was deodorized in the same manner as in Example 5, except that the electromagnetic wave irradiation unit 30 did not irradiate the electromagnetic wave.
Then, the odor concentrations of the gas to be treated and the gas to be treated were measured by the three-point comparison type odor bag method to obtain the odor removal rate. Table 3 shows the results.

(Example 6)
Kitchen exhaust as the gas to be treated was deodorized in the same manner as in Example 5 except that the number of structures 42 installed in the container 41 was changed to two.
Then, the odor concentrations of the gas to be treated and the gas to be treated were measured by the three-point comparison type odor bag method to obtain the odor removal rate. Table 3 shows the results.

(Comparative Example 4)
Kitchen exhaust as the gas to be treated was deodorized in the same manner as in Example 6, except that the electromagnetic wave irradiation unit 30 did not irradiate the electromagnetic wave.
Then, the odor concentrations of the gas to be treated and the gas to be treated were measured by the three-point comparison type odor bag method to obtain the odor removal rate. Table 3 shows the results.

(Example 7)
Kitchen exhaust as the gas to be treated was deodorized in the same manner as in Example 5, except that the deodorizing conditions were changed to the following conditions.
Then, the odor concentrations of the gas to be treated and the gas to be treated were measured by the three-point comparison type odor bag method to obtain the odor removal rate. Table 3 shows the results.
<Deodorization conditions>
・Outdoor humidity: 48% RH
・Outside temperature: 5℃
・Humidity inside the duct: 75% RH
・Temperature inside the duct: 28℃
・Exhaust temperature: 21℃
・Exhaust volume: 0.94 m ³ /min (flow velocity: 2.0 m / sec)
・AC current frequency: 0.5 kHz and 1 kHz
・Zeta potential given by electromagnetic waves: Plus

From Tables 1 to 3, it can be seen that in Examples 1 to 7 in which electromagnetic waves were irradiated, the odor removal rate was improved compared to Comparative Examples 1 to 4 in which electromagnetic waves were not irradiated.
In addition, from Examples 3 and 4 in Table 2, it can be seen that when a polymer flocculant having a charge opposite to the zeta potential imparted to the components in the gas to be treated by the irradiation of the electromagnetic wave in the electromagnetic wave irradiation unit 30 is used, the odor can be removed. It can be seen that the rate can be further improved.

According to the deodorizing system of the present invention, it is possible to efficiently deodorize the gas to be treated that contains malodorous components.

10 Humidifier 20 Heating device 30 Electromagnetic wave irradiation part 31 Coil 32 AC current generator 40 Deodorizing part 41 Container 42 Structure 50 Exhaust duct 60 Kitchen duct 61, 62, 63 Flexible duct 70 Exhaust fan 100, 100A, 100B Deodorizing system

Claims (4)

A deodorizing system for deodorizing a gas to be treated containing odorous components,
an electromagnetic wave irradiation unit that irradiates the gas to be processed with an electromagnetic wave;
a deodorizing unit for bringing the gas to be treated, which has been irradiated with electromagnetic waves by the electromagnetic wave irradiation unit, into contact with a deodorizing material;
The electromagnetic wave irradiating section is electrically connected to a coil as an electromagnetic wave oscillating section for irradiating the gas to be treated with an electromagnetic wave, and is electrically connected to the coil, and generates an alternating current that generates an electromagnetic wave by passing an alternating current through the coil. and
The deodorizing system , wherein the deodorizing material is an aqueous solution of a polymer flocculant having a charge opposite to the zeta potential imparted to the components in the gas to be treated by the electromagnetic wave irradiation section . 2. The deodorizing system according to claim 1, further comprising a humidifying device for humidifying the gas to be treated on the upstream side of the electromagnetic wave irradiation section. 3. The deodorizing system according to claim 1, further comprising a heating device for heating the gas to be treated on the upstream side of the electromagnetic wave irradiation unit. 4. The deodorizing system according to any one of claims 1 to 3 , further comprising a liquid electromagnetic wave irradiation device for irradiating the liquid with electromagnetic waves.

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