JP2010029865A - Gas purifying apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas purifying method and a gas purifying apparatus capable of decomposing and removing chemical substances in high efficiency, low in cost and easy in maintenance. <P>SOLUTION: After removing particular substances from a gas 8 containing particular substances and chemical substances under atmospheric condition, while catching the chemical substances contained in the gas and catching moisture contained in the gas with an adsorbent 3 of a honeycomb structure, also while maintaining the absorbent 3 adsorbing the chemical substances; an electric discharge is generated between the adsorbent and an electrode to generate active species by reaction of the moisture existing in the atmosphere or on the surface of the adsorbent 3, and by the active species generated by reaction of the moisture, the chemical substances adsorbed to the adsorbent 3 are decomposed and removed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas purification apparatus, and more particularly to a gas purification apparatus suitable for cleaning an air containing chemical substances such as volatile organic compounds (VOCs) such as formaldehyde and acetaldehyde and ammonia. is there.

  In recent years, due to the deterioration of the global environment, air pollution in homes and workplaces has become a problem. One of the air pollution is the occurrence of various odors and allergies caused by chemical substances such as ammonia, hydrogen sulfide, and acetaldehyde, in order to realize a healthy and comfortable living environment. The removal of these chemical substances is an urgent task. Of the substances contained in the atmosphere, particulate substances such as dust are usually in the order of μm to mm, and can be removed with various commercially available filters. However, since the chemical substances that are the source of odors are on the order of nanometers, special filters such as activated carbon with fine pores are required to remove them with a filter. The filter used is prone to clogging and requires a lot of maintenance, and it is necessary to develop a new method for removing chemical substances, instead of using a commercially available filter. Met.

The conventional air cleaning device includes, for example, an ion generator 11, an air outlet 12, a pre-filter 13, an activated carbon filter 14, a HEPA filter 15, a blower fan 16, and an air suction port 17. The ion generator 11 includes a cylindrical glass tube 21, and an inner electrode 22 and an outer electrode 23 made of stainless mesh disposed so as to face each other with the cylindrical glass tube 21 interposed therebetween. 17 on the upstream side. Under atmospheric and 15KHz between the inner electrode 22 and outer electrode 23 of the ion generating device 11, an AC voltage of 1.1～1.4KV (effective value) is ^applied, H +, _{O 2} ^-, such as Positive ions and negative ions are generated. If these positive ions and negative ions are generated at the same time, oxygen and water contained in the atmosphere react with positive ions and negative ions, and hydrogen peroxide and water have a sterilizing effect. Active species such as oxidation radicals are generated. These active species generated by the reaction of oxygen and water contained in the atmosphere with positive ions and negative ions exhibit a powerful active action and, when released into space, decompose and remove chemical substances in the air. An air cleaner that is easy to maintain is realized (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2002-58731 (page 3, FIGS. 1 and 2)

  In the conventional air cleaner, since an alternating voltage is supplied to the ion generator 11, positive and negative charges are alternately applied to the inner electrodes 22 of the ion generator 11. The outer electrode 23 is grounded. Thus, when a positive voltage is applied to the inner electrode 22 of the ion generator 11, negative ions are attracted to the inner electrode 22 side and disappear by colliding with the inner electrode 22. At this time, positive ions move to the outer electrode 23 side, collide with the outer electrode 23 and disappear. Conversely, when a negative voltage is applied to the inner electrode 22 of the ion generator 11, positive ions are attracted to the inner electrode 22 side and disappear by colliding with the inner electrode 22, and the negative ions are removed from the outer electrode 22. It is attracted to the side 23 and disappears by colliding with the outer electrode 23.

  As described above, in the conventional air cleaner, positive and negative ions are generated by the application of an alternating current charge. Therefore, positive ions and negative ions generated from the ion generator are negatively generated in a short time after the generation. Since it loses its charge and disappears when it is electrically attracted to an adjacent electrode having a potential, positive potential or zero potential (ground potential), the generation efficiency of the active species having the above-mentioned sterilizing effect is extremely low. It was. In addition, the decomposition of the chemical substance by the active species also uses a mechanism that reacts with the chemical substance by floating the active species in the atmosphere, so the probability that the generated active species reacts with the chemical substance is low, Decomposition of chemical substances takes time, and active species may decompose naturally while floating in the atmosphere, so the efficiency of decomposition is low and it is difficult to decompose chemical substances at low cost Had.

  The present invention aims to solve such problems, and after removing the particulate matter from the gas containing the particulate matter and the chemical substance, the chemical substance contained in the gas is collected by the adsorbent, and in the gas While collecting the moisture contained in the adsorbent, a discharge is generated between the adsorbent and the electrode, and the chemical species adsorbed on the adsorbent is decomposed and removed by the active species generated by the discharge on the adsorbent surface. Is.

  A gas purification apparatus according to the present invention includes a particulate matter separation unit that separates particulate matter from a gas containing particulate matter and a chemical substance, an adsorbent having a honeycomb structure that adsorbs the chemical substance contained in the gas, A supply electrode provided in close contact with the adsorbent, a discharge electrode provided opposite the adsorbent, a potential adjusting means for adjusting the potential of the supply electrode, and a high-voltage power supply for supplying a high voltage to the discharge electrode Chemicals collected by the adsorbent by active species generated by the reaction of moisture present in the atmosphere or adsorbent surface by the discharge generated in the space formed by the adsorbent and the discharge electrode It decomposes and removes substances.

  According to the gas purification apparatus of the present invention, the particulate matter separating means for separating the particulate matter from the gas containing the particulate matter and the chemical substance, and the honeycomb structure adsorbent for adsorbing the chemical substance contained in the gas A supply electrode provided in close contact with the adsorbent, a discharge electrode provided opposite the adsorbent, a potential adjusting means for adjusting the potential of the supply electrode, and a high-voltage power supply for supplying a high voltage to the discharge electrode And collected by the adsorbent by active species generated by the reaction of moisture present in the atmosphere or adsorbent surface by the discharge generated in the space formed by the adsorbent and the discharge electrode. It is configured to decompose and remove chemical substances, so that the chemical substances can be efficiently adsorbed to the adsorbent and adsorbed on the adsorbent by radicals generated by discharge or discharge and moisture. To detoxifying agent, it is possible to perform the decomposition and removal of chemicals at high efficiency, low cost and easy maintenance gas purifying device can be realized.

Hereinafter, the present invention will be described with reference to the accompanying drawings to explain the present invention in more detail.
Embodiment 1
FIG. 1 is a configuration explanatory view showing an example of a gas purification apparatus according to the present invention. In such a gas purification apparatus, first, the gas 8 to be treated containing particulate matter and chemical substance is guided to the blower 2 and introduced into the discharge space through the filter 7. At this time, the particulate matter contained in the gas 8 to be treated is removed by the filter 7. As the filter 7, a filter that matches the type, size, or concentration of the particulate matter contained in the gas to be treated 8 can be used. For example, a commercially available resin filter, paper filter, HEPA filter, ULPA filter, A combination of these can be used.

  The gas to be treated 8 from which the particulate matter has been removed passes through the discharge space between the adsorbent 3 whose outer periphery is covered with the supply electrode 4 and the metal electrode (discharge electrode or line electrode) 1 and passes through the adsorbent 3. When passing, the chemical substance contained in the gas 8 to be treated is adsorbed by the adsorbent 3. This adsorbent 3 is a conductive and adsorbent material such as graphite or activated carbon, or an adsorbent that is non-conductive but highly water adsorbent, such as silica gel or zeolite, that is, to be treated. It is made of a non-conductive adsorbent that is made to adsorb moisture together with the substance, and is provided with pores that serve as passages for the gas to be treated. The to-be-processed gas 8 from which the chemical substance has been removed by the adsorbent 3 is discharged to the outside through a discharge port (not shown).

At this time, the potential adjustment device 5 sets the potential of the supply electrode 4 to zero potential (ground), and the high voltage power source 6 applies a high voltage to the metal electrode 1. As a result, corona discharge occurs between the metal electrode 1 and the adsorbent 3, and plasma is generated in the vicinity of the metal electrode 1. In general, the gas 8 to be treated is often air, and oxygen and water in the air are present. Therefore, in this plasma portion, electrons and positive and negative ions such as H ⁺ and O ₂ ⁻ coexist. ing. The metal electrode 1 is a metal frame provided with a thin wire having a diameter of 0.1 to 0.2 mm, and the thin wire is attached to the metal frame via a metal spring (not shown). The device is designed so that it will not bend under a certain tension. Moreover, the metal electrode 1 does not need to be a metal, and can be substituted by a conductive object.

  When a negative high voltage is applied to the metal electrode 1, positive ions are electrically attracted to the metal electrode 1 and disappear when they collide with the metal electrode 1. On the other hand, negative ions and electrons can move from the metal electrode 1 toward the adsorbent 3 and be guided to the adsorbent 3. Moreover, since this moving direction is the same as the moving direction of the gas caused by the blower 2, negative ions and electrons generated in the vicinity of the metal electrode 1 are efficiently guided to the adsorbent 3 having a relatively positive potential. be able to. Since negative ions and electrons are very reactive, when introduced to the adsorbent 3, it reacts with the chemical substance adsorbed on the surface of the adsorbent 3 and decomposes the chemical substance. In addition, when water is present in the atmosphere or on the surface of the adsorbent, negative ions react with this water and generate new radicals (active species) with high activity such as hydroxyl radicals. These radicals are also powerful. It has an oxidizing action and decomposes chemical substances. On the contrary, when a positive high voltage is applied to the metal electrode 1, the plasma region expands (the plasma space moves toward the adsorbent 3 side) compared to the case where a negative high voltage is applied. Therefore, radicals are generated in the vicinity of the surface of the adsorbent 3 by the ions and electrons that have reached the vicinity of the adsorbent 3, and react with the chemical substance adsorbed on the surface of the adsorbent 3 to decompose the chemical substance. .

  Similarly to the case of applying a negative voltage, when moisture is present in the atmosphere or on the surface of the adsorbent, negative ions react with this moisture and new radicals (active species) having high activity such as hydroxyl radicals. And the adsorbed chemical substance can be decomposed more efficiently. As described above, the chemical substance adsorbed on the adsorbent 3 is rendered harmless by the radicals generated by the discharge that occurs between the adsorbent 3 and the metal electrode 1 and is released to the outside.

If particulate matter such as dust is present in the atmosphere, the particulate matter is charged and discharge power is consumed, energy used for radical generation is reduced, or particulate matter is adsorbed on the adsorbent 3. It adheres and causes the problem that the chemical substance adsorption performance of the adsorbent 3 is lowered. However, in this apparatus, since the particulate matter is previously removed by the filter 7, the energy used for radical generation is reduced by the particles, or the chemical adsorption performance of the adsorbent is reduced by the presence of the particles. There is no.
As described above, in the gas purification apparatus according to the present invention, in the atmosphere, particulate matter present in the gas to be treated such as the atmosphere or exhaust gas is removed in advance by collection, and the chemical substance is adsorbed by the adsorbent. By doing so, since the adsorbent is not used for adsorbing the particulate matter but only used for adsorbing the chemical substance, the chemical substance is efficiently adsorbed by the adsorbent.

  Further, by being adsorbed by the adsorbent, the chemical substance has a higher concentration than the concentration in the gas to be treated, and is substantially concentrated. Furthermore, by causing a discharge between the adsorbent and the metal electrode while adsorbing the chemical substance with the adsorbent, radicals are efficiently generated in the vicinity of the adsorbent, and the chemical substance adsorbed on the adsorbent is efficiently produced. Will react. At this time, if moisture exists on the surface of the adsorbent, new radicals having high activity such as hydroxyl radicals are generated, and the chemical substances adsorbed on the adsorbent are also decomposed by these radicals. That is, according to the gas purification apparatus according to the present invention, the active species (radicals) generated by the discharge are efficiently guided to the adsorbent and the chemical substance adsorbed on the adsorbent is rendered harmless. A gas purification apparatus that can decompose and remove substances, is inexpensive, and is easy to maintain is realized.

  In the present embodiment, the case where the adsorption operation of the chemical substance to the adsorbent 3 and the discharge operation between the adsorbent 3 and the metal electrode 1 are performed simultaneously and continuously is described. May be performed continuously, and the discharge operation may be performed intermittently. By doing so, the concentration of chemical substances by adsorption progresses, and the chemical substances can be decomposed by discharge in a more concentrated state, so the energy required to decompose the chemical substances is reduced, that is, high efficiency. With this, the effect of decomposing chemical substances can be obtained. However, since the temperature of the adsorbent 3 rises at the start of discharge, a part of the adsorbed chemical substance may be desorbed, and this may not be applicable when leakage of such a chemical substance becomes a problem. .

  In the above configuration, the blower 2 is disposed on the leeward side of the metal electrode 1, but the blower 2 may be disposed on the leeward side of the adsorbent 3. With such an arrangement, there is an advantage that the durability of the blower 2 can be improved when a corrosive gas is contained in the gas 8 to be treated. FIG. 2 is an example when the blower 2 is arranged on the leeward side of the adsorbent 3 based on the configuration of FIG. 1. In addition, since the above processing can be performed in the atmosphere, this apparatus does not necessarily require high airtightness. However, if the gas introduced into the adsorbent 3 contains particulate matter, the adsorbent 3 In addition to the fact that the adsorption capacity for chemical substances is substantially reduced, and the adsorbent 3 cannot completely remove the particulate substances, some of the particulate substances The energy that is released into the space between the adsorbent 3 and the metal electrode 1 to generate radicals and the like is used to charge these particulate substances and consumed. For this reason, it is preferable that the apparatus has an air tightness that can prevent the inflow of particulate matter into the space between the filter 7 and the metal electrode 1.

  The adsorbent 3 preferably has a honeycomb structure in view of the pressure loss of the gas flow when the chemical substance is concentrated and the mobility of ions when the surface is treated with ions. Further, in order to adjust the potential of the adsorbent 3, the adsorbent 3 needs to be configured to be electrically connected to the supply electrode 4. FIG. 3 shows an example of the configuration of the adsorbent 3 integrated with the supply electrode 4, and shows a configuration in which the outer periphery of the adsorbent 3 is held by the supply electrode (metal frame) 4. . The metal frame is not particularly limited as long as it is a conductor.

  Moreover, as a structure of the adsorbent 3 and the supply electrode 4, it can replace with the structure which surrounds the circumference | surroundings of an adsorbent with a metal frame, and can use what formed the adsorbent on the surface of a metal honeycomb. FIG. 4 is a cross-sectional view showing an example of the case where the adsorbent 3 and the supply electrode 4 are integrally formed. Conductivity such as activated carbon or graphite is applied to the surface of a corrosion-resistant material such as stainless steel or platinum. Adsorbent material or non-conductive such as silica gel or zeolite, but adsorbent with high hygroscopicity of water, that is, by adsorbing moisture together with the substance to be treated, it is made conductive. A non-conductive adsorbent material is shown.

Such a monolith can be obtained, for example, by immersing a metal honeycomb in a slurry-like solution in which activated carbon is dissolved and firing it at a suitable temperature after drying. In the case of such an integral body, external charges are directly supplied to the metallic honeycomb.
In addition, as a configuration of the adsorbent 3 and the supply electrode 4, it is also possible to adopt a configuration in which a gas-permeable electric conductor is disposed in close contact with the adsorbent 3 in the gas passage portion on the lee side of the adsorbent 3. it can.

  As such a breathable conductor, for example, a metal product such as a conductive metal mesh or punching metal, a metal fiber such as fibrous stainless steel, or a conductive fiber such as carbon paper can be used. . In addition, when taking such a structure, it is important that the adsorbent 3 and the supply electrode 4 are in close contact so as not to cause a discharge between the adsorbent 3 and the supply electrode 4. Thus, it is possible to prevent discharge from occurring on the leeward side of the adsorbent 3.

In the above embodiment, the conductive material is adsorbed by adsorbing moisture together with the substance to be treated to a conductive adsorbent such as graphite or activated carbon or a non-conductive adsorbent such as silica gel or zeolite. Although the case where the non-conductive adsorbent made to have was used was described, manganese dioxide (MnO ₂ ), titanium dioxide (TiO ₂ ), zinc oxide (ZnO), platinum (Pt), copper on the adsorbent surface If a substance having a catalytic action such as (Cu) is supported, the chemical substance decomposition and removal effect can be further enhanced.
In the above embodiment, the case where the potential of the supply electrode 4 is set to zero potential (ground) by the potential adjusting device 5 and the high voltage is applied to the metal electrode 1 by the high voltage power source 6 has been described. A high voltage may be applied to the metal electrode 1 by 6, and a positive voltage or a negative voltage may be applied to the supply electrode 4 by the potential adjusting device 5. When a positive voltage is applied to the supply electrode 4, the adsorbent 3 is charged positively, and a chemical substance charged negatively in the gas, such as nitrogen oxide, is selectively and efficiently used. Can be adsorbed on. Further, when a negative voltage is applied to the supply electrode 4, the adsorbent 3 is negatively charged, and a positively charged chemical substance in the gas, such as a volatile organic compound or ammonia, is selected. Can be adsorbed efficiently and efficiently. From the above, by applying a voltage to the supply electrode 4 by the potential adjusting device 5, an effect of selectively and efficiently removing a certain substance can be obtained. However, power is consumed to charge the adsorbent 3, which causes a problem that the amount of power consumption increases. Further, it is necessary to devise such that an object serving as a counter electrode is not placed on the leeward side of the adsorbent 3 to which a voltage is applied. In order to ensure electrical safety, voltage protection measures are required to prevent humans or objects from touching the adsorbent 3 to which a voltage is applied.
Furthermore, a high voltage may be applied to the supply electrode 4 by the high voltage power source 6 and the potential of the metal electrode 1 may be set to zero potential by the potential adjusting device 5. FIG. 5 is an example in which a high voltage is applied to the supply electrode 4 by the high voltage power source 6 and the potential of the metal electrode 1 is set to zero potential by the potential adjusting device 5 based on the configuration of FIG. Even in this case, a discharge can be caused in the vicinity of the adsorbent surface, and the adsorbed chemical substance can be decomposed. However, when a discharge occurs on the lee side of the adsorbent 3, ozone and nitrogen oxides of the discharge product are included in the clean gas, causing a problem that the clean gas is contaminated. Therefore, it is necessary to devise such that an object serving as a counter electrode is not placed on the leeward side of the adsorbent 3 to which a high voltage is applied. Further, in order to ensure electrical safety, a high voltage protection measure is required to prevent a human or an object from touching the adsorbent 3 or the supply electrode 4 to which a high voltage is applied.

  Next, the relationship between the chemical substance concentration and the decomposition efficiency when the chemical substance is decomposed by discharge will be described. FIG. 6 is a diagram showing the change over time in the amount of acetic acid decomposed (μmol) when acetic acid, which is a representative of a hardly decomposable organic chemical substance, is irradiated with negative ions generated by electric discharge. A TOC meter (Total Organic Carbon: manufactured by Shimadzu Corporation) measures the time change of acetic acid decomposed by spraying negative ions to an aqueous solution having two types of non-concentrated concentrations, and measuring the amount of organic carbon contained in the aqueous solution. TOC5000). In the figure, the vertical axis represents the amount of acetic acid decomposed (μmol), and the horizontal axis represents the decomposition time (hr).

In the figure, 101 indicated by a solid line indicates a case where the acetic acid concentration is 5 mg / L (liter) (concentration), and 102 indicated by a dotted line indicates a case where the acetic acid concentration is 1 mg / L (non-concentration). As other experimental conditions, the acetic acid solution amount is 300 mL, the negative ion concentration is 10 ⁶ ions / cm ³ , the flow rate of the gas containing ions is 200 L / min, and the distance between the ion generator and the liquid surface is 2 cm. .

  When the acetic acid concentration indicated by 101 in the figure is high, the acetic acid decomposition amount increases with time, indicating that acetic acid is efficiently decomposed by negative ion irradiation. On the other hand, when the concentration of acetic acid indicated by 102 in the figure is low, the amount of acetic acid decomposed hardly increases even after a certain period of time, indicating that the decomposition of acetic acid by negative ion irradiation has not progressed. . Thus, it can be seen that in the decomposition of a chemical substance using radicals generated by discharge, the higher the concentration of the chemical substance, the more efficiently it can be decomposed. That is, it can be seen that radicals generated by discharge can be used more efficiently when the chemical substance is concentrated and then irradiated.

Next, the performance of the adsorbent that adsorbs the chemical substance when the chemical substance is decomposed by causing a discharge between the adsorbent 3 and the metal electrode 1 will be described. FIG. 7 is a comparison of the adsorption characteristics of various adsorbents by investigating the change of formaldehyde concentration using air containing formaldehyde, one of the substances causing sick house syndrome, as a treatment target. In the figure, the vertical axis represents formaldehyde concentration (ppm) and the horizontal axis represents elapsed time (min). In the figure, reference numerals 103 to 107 denote hydrophobic zeolite (SiO ₂ / Al ₂ O ₃ = 10), activated carbon, hydrophilic zeolite (SiO ₂ / Al ₂ O ₃ = 2), and MnO ₂ catalyst-supported hydrophobic zeolite ( It shows changes in formaldehyde concentration when SiO ₂ / Al ₂ O ₃ = 10) and MnO ₂ catalyst-supported hydrophilic zeolite (SiO ₂ / Al ₂ O ₃ = 2) are used as adsorbents. For the test, a formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm was treated with the above-mentioned gas purifier using a closed container having a capacity of 72 liters. Measured with an electric machine XP-308-2).

As shown by 103 in the figure, when hydrophobic zeolite is used as the adsorbent, the concentration of formaldehyde hardly decreases even after the treatment time has passed, indicating that hydrophobic zeolite is not suitable as an adsorbent. ing. Moreover, as shown by 104 to 106 in the figure, when activated carbon, hydrophilic zeolite, and MnO ₂ catalyst-supported hydrophobic zeolite are used as the adsorbent, the concentration of formaldehyde changes with almost the same tendency. There was found. That is, the concentration of formaldehyde decreases to about 0.1 ppm with time, indicating that these adsorbents are applicable as formaldehyde adsorbents. On the other hand, as shown by 107 in the figure, when MnO ₂ catalyst-supported hydrophilic zeolite was used as the adsorbent, the ultimate concentration of formaldehyde after a lapse of a certain time was 0.06 ppm, and among the adsorbents used in the experiment, Shows the highest adsorption performance. Thus, when a chemical substance is adsorbed by an adsorbent, it is more effective to use a hydrophilic adsorbent than to use a hydrophobic adsorbent, and the ratio of SiO ₂ / Al ₂ O ₃ is 5 or less. It has been found desirable to use a zeolite. Further, in the presence of MnO ₂担時, it can be seen that efficiently adsorb chemicals when used担時zeolite with MnO _2. That is, it has been found that chemical substances can be effectively concentrated when MnO ₂ catalyst-supported hydrophilic zeolite is used.

Next, the influence of the material of the adsorbent on the chemical substance decomposition when the chemical substance is decomposed by causing a discharge between the adsorbent 3 and the metal electrode 1 will be described. In FIG. 8, air containing formaldehyde which is one of the substances causing sick house syndrome is treated, and activated carbon, hydrophobic zeolite (SiO ₂ / Al ₂ O ₃ = 10), hydrophilic zeolite (SiO ₂ ) as an adsorbent. / Al ₂ O ₃ = 2), MnO ₂ catalyst-supported hydrophobic zeolite (SiO ₂ / Al ₂ O ₃ = 10), and MnO ₂ catalyst-supported hydrophilic zeolite (SiO ₂ / Al ₂ O ₃ = 2) By examining the changes in formaldehyde concentration when chemical substances are decomposed, the adsorption characteristics of various adsorbents are compared. In the figure, the vertical axis represents formaldehyde concentration (ppm) and the horizontal axis represents elapsed time (min). For the test, a closed container having a capacity of 72 liters was used, and formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm was treated by applying a negative high voltage to the metal electrode 1 of the above-described gas purification apparatus, and the formaldehyde concentration Was measured with a formaldehyde measuring instrument (XP-308-2 manufactured by New Cosmos Electric Co., Ltd.).

The obtained results have exactly the same tendency as in the case of the adsorption characteristics described above, and as shown by 103 in the figure, the decrease in formaldehyde concentration is small when hydrophobic zeolite is used as the adsorbent, and the hydrophobic zeolite is adsorbed. It turned out to be unsuitable as an agent. In addition, as indicated by 104 to 106 in the figure, the concentration of formaldehyde when activated carbon, hydrophilic zeolite, and MnO ₂ catalyst-supported hydrophobic zeolite are used as the adsorbent is almost the same change (decrease). showed that. Thus, these adsorbents are not suitable as adsorbents used in the present apparatus. On the other hand, as shown by 107 in the figure, when MnO ₂ catalyst-supported hydrophilic zeolite is used as the adsorbent, the ultimate concentration after a certain time (about 30 to 40 minutes) has elapsed is 0.03 ppm, and the decomposition performance is It shows the best. Thus, in order to decompose a chemical substance using a discharge that occurs between the adsorbent and the metal electrode, it is more effective to use a hydrophilic adsorbent in comparison between hydrophilic and hydrophobic, Further, in the presence of MnO ₂担時, it is understood that the adsorbent for担時the MnO ₂ can be effectively adsorbed chemicals. That is, it was found that the chemical substance can be decomposed most effectively when MnO ₂ catalyst-supported hydrophilic zeolite is used as the adsorbent.

Next, in the case where a chemical substance is decomposed by generating a discharge between the adsorbent 3 and the metal electrode 1, the influence of the polarity of the high voltage applied to the metal electrode 1 on the decomposition of the chemical substance will be described. FIG. 9 shows formaldehyde in a case where air containing formaldehyde, which is one of the substances causing sick house syndrome, is treated, MnO ₂ catalyst-supported hydrophilic zeolite is used as an adsorbent, and positive and negative high voltages are applied. By investigating the change of concentration, the relationship between the difference in polarity of the applied voltage and the adsorption property was compared. In the figure, the vertical axis represents formaldehyde concentration (ppm) and the horizontal axis represents treatment time (min). For the test, a closed electrode having a capacity of 72 liters was used, and formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm was adjusted so that the current flowing through the adsorbent 3 of the gas purification device was 0.5 mA. No. 1 was processed by applying a high voltage, and the change in formaldehyde concentration over time was measured with a formaldehyde measuring instrument (New Cosmos Electric XP-308-2).

  The formaldehyde concentration when the negative high voltage indicated by 109 in the figure is applied, and the formaldehyde concentration when the positive high voltage indicated by 110 in the figure is 108 is the formaldehyde concentration of 108 when no discharge is performed. Compared to the above, it is greatly decreased with the passage of time, indicating that the decomposition of formaldehyde proceeds due to discharge. In addition, when the data of 109 and 110 are compared, the concentration of formaldehyde is lower when positive polarity is applied, and the decomposition performance of formaldehyde is improved by applying a positive voltage. As described above, in order to decompose the chemical substance using the discharge that occurs between the adsorbent and the wire electrode, the polarity of the voltage applied to the metal electrode 1 may be either, but it is better to apply a positive voltage. It was found that chemical substances can be decomposed more efficiently.

Next, the influence of the input power amount on the chemical substance decomposition in the case where the chemical substance is decomposed by causing discharge between the adsorbent 3 and the metal electrode 1 will be described. FIG. 10 shows a process using air containing formaldehyde, which is one of the substances causing sick house syndrome, as an object to be treated, using MnO ₂ catalyst-supported hydrophilic zeolite and other adsorbents to produce positive and negative high voltages as metal electrodes. 1 is a comparative study of the relationship between the difference in polarity of applied voltage and the formaldehyde removal rate by changing the input power. In the figure, the vertical axis represents the formaldehyde removal rate (%) during 1 minute treatment, and the horizontal axis represents the discharge power (W). In the test, formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm was treated for 1 minute by applying a high voltage to the metal electrode 1 of the above-mentioned gas purifier using a closed container having a capacity of 72 liters. The removal rate was measured with a formaldehyde measuring instrument (XP-308-2 manufactured by New Cosmos Electric Co., Ltd.).

In the figure, the formaldehyde removal rate indicated by the vertical axis is defined by the following equation (1).
Formaldehyde removal rate (%) = {(concentration before treatment) − (concentration after treatment)} / (concentration before treatment) * 100 (1)
The amount of input power (discharge power) indicated on the horizontal axis indicates the amount of power input to the adsorbent per unit area.
Comparing the formaldehyde removal rate when the negative high voltage shown by 112 in the figure is applied and the formaldehyde removal rate when the positive high voltage shown by 111 in the figure is applied, the discharge power is It has been found that the formaldehyde removal rate increases as it increases. In addition, as described above, even when the discharge power (W) is the same, the formaldehyde removal rate is lower when positive polarity is applied, and the decomposition characteristics of formaldehyde are improved by applying a positive voltage. ing. Thus, in order to decompose the chemical substance using the discharge generated between the adsorbent and the metal electrode, the polarity of the voltage applied to the metal electrode 1 may be either, but it is better to apply a positive voltage. It was found that chemical substances can be decomposed slightly efficiently. In the case of formaldehyde, when the concentration in the space becomes 0.25 to 0.5 ppm, it is said that 20% or more of people complain of an abnormality. To reduce the environmental standard value to 0.08 ppm or less, 70% A removal rate of ˜85% or more is required.

However, it has been found from the research results of the inventors of the present application that the generation of nitrogen oxides increases when the input power amount is increased. FIG. 11 is a diagram showing the relationship between the formaldehyde residual rate after decomposition treatment, the nitrogen oxide concentration in the container, and the amount of discharge power. In FIG. 11, the left vertical axis represents the formaldehyde residual rate (%) after the decomposition treatment, the right vertical axis represents the nitrogen oxide concentration (ppb) in the container, and the horizontal axis represents the discharge power (Wh). In the figure, 113 indicates the relationship between the formaldehyde remaining rate after the decomposition treatment and the discharge power amount, and 114 indicates the relationship between the nitrogen oxide concentration in the container and the discharge power amount. In the test, a formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm was applied to the metal electrode 1 of the above-described gas purifier using a semi-sealed container (ventilation rate 0.5 times / hour) having a capacity of 1000 liters. Was applied for 60 minutes, and the residual rate of formaldehyde was measured with a formaldehyde measuring device (XP-308-2 manufactured by Shin Cosmos Electric). Further, the nitrogen oxide concentration in the container was measured using a NOx analyzer (GLN-32 type manufactured by DKK).
In the figure, the remaining rate after the decomposition process indicated by the left vertical axis is defined by the following equation (2).
Formaldehyde residual rate (%) = (Remaining amount in the container after treatment) / (Initial injection amount) × 100 (2) Also, in the figure, the concentration of nitrogen oxides in the container indicated by the right vertical axis is It shows the final concentration reached in the container when operated for a long time. As shown in FIG. 11, when an excessively large amount of discharge electric energy, for example, an electric energy larger than the discharge electric energy that can achieve the above-mentioned required formaldehyde removal rate of 85% (residual rate 15%), is generated. This is considered a problem. The reference value of nitrogen oxide is 80 ppb, and the nitrogen oxide concentration is considered to be 80 ppb or less. Therefore, it is considered that the discharge power amount needs to be 10 Wh or less in order to keep the concentration regulation of nitrogen oxides while ensuring the formaldehyde decomposition rate. In addition, even if it is the same amount of discharge power, it can be seen that the amount of nitrogen oxide produced is smaller when a positive high voltage is applied, and if the amount of nitrogen oxide produced becomes a problem, the positive voltage It is preferable to apply.

  In the above-described embodiment, the case where the metal electrode 1 is fixed has been described. However, a movable type linear electrode having a slide mechanism that makes the distance between the metal electrode 1 and the adsorbent 3 variable is used. Anyway. FIG. 12 shows an example in which a movable line electrode 11 is provided instead of the metal electrode 1 based on the configuration of FIG. With this configuration, the chemical substance can be decomposed more efficiently.

  Moreover, in the said embodiment, although shown about the case where the metal electrode 1 was comprised by the thin line (line electrode), the metal electrode 1 is like a needle-like electrode with a needle-like protrusion, or a brush. A brush-like electrode in which a metal wire is implanted may be used. FIG. 13A is a perspective view showing an example in which the needle electrode 12 having needle-like protrusions is provided instead of the metal electrode 1 based on the configuration of FIG. 1, and FIG. It is the side view to which the part of the acicular electrode 12 was expanded. 14A is a perspective view showing an example in which the brush-like electrode 13 is provided instead of the metal electrode 1 based on the configuration of FIG. 1, and FIG. It is the side view which expanded the part. In the case of using the electrode having such a shape, the tip portions of the needle-like electrode 12 and the brush-like electrode 13 can be arranged in the vicinity of the adsorbent 3 or can be inserted into the space in the honeycomb. FIG. 15 is a perspective view for explaining an example when the tip portion of the needle-like electrode 12 is arranged in the vicinity of the adsorbent 3 based on the configuration of FIG. When such a configuration is adopted, a discharge can be caused inside or on the surface of the adsorbent 3, and the chemical substance adsorbed on the adsorbent 3 can be decomposed more efficiently. However, if the needle electrode 12 is brought too close, a spark discharge occurs and a large amount of current flows. Therefore, by incorporating an output current control device in the high voltage power supply 6 or by making the output voltage waveform of the high voltage power supply 6 pulsed, It is necessary to devise measures to prevent a large current from flowing. Further, when discharging in the honeycomb space, it is necessary to determine the insertion position so that the discharge product is not released to the outside.

  In addition to the above configuration, a temperature controller 14 may be provided to adjust the temperature of the adsorbent 3. FIG. 16 is a perspective view illustrating a configuration example when the temperature controller 14 is provided in the configuration illustrated in FIG. 1. As described above, when the chemical substance to be treated is adsorbed, it is possible to increase the concentration density of the chemical substance on the surface of the adsorbent 3 by lowering the temperature of the adsorbent 3 by the temperature controller 14. Chemical substances can be decomposed efficiently. In the case of decomposing, by increasing the temperature, it is possible to increase the efficiency of generating radicals on the surface of the adsorbent, and it is possible to decompose the chemical substance more efficiently.

  Furthermore, in the said embodiment, although shown about the case where one chemical substance process part comprised by the metal electrode 1, the adsorbent 3, and the feed electrode 4 was provided after the filter 7 and the air blower 2, the air blower 2 After this, it can also be set as the structure which provided the some chemical substance process part. That is, a plurality of metal electrodes, adsorbents, and supply electrodes are provided after the blower 2, and when the adsorption of the chemical substance in the first chemical substance treatment unit is completed, the second chemical substance treatment part is switched to. By adopting a configuration in which chemical substances are adsorbed by a new chemical substance processing unit while chemical substances are decomposed by electric discharge in the chemical substance processing part after adsorption is completed, the chemical substance is sufficiently adsorbed and has a high concentration It becomes possible to treat the chemical substance concentrated in this manner by electric discharge, and it is possible to continuously purify the gas with high efficiency without stopping the blower 2. This switching can be performed by arranging a plurality of chemical substance processing units in parallel and sequentially moving the chemical substance processing units arranged in parallel, and also connecting the blower 2 and the plurality of chemical substance processing units with piping. It is also possible to adopt a configuration in which the chemical substance processing unit is selected by connecting and switching the gas flow using a valve or the like.

  Further, in the above embodiment, the adsorbent 3 is fixed to the chemical substance processing unit. However, the adsorbent 3 may be provided with a rotation mechanism in which the left and right surfaces are reversed in the chemical substance processing unit. . For example, a rotating shaft that penetrates the chamber may be provided, and a mechanism for rotating the adsorbent 3 around the rotating shaft may be provided. By providing such a mechanism and allowing the left and right surfaces of the adsorbent to be reversed, the chemical substance is more efficiently decomposed by electric discharge. That is, the adsorbent 3 normally adsorbs a large amount of chemical substances on the left side in the figure, but by inverting the left and right sides by the aforementioned rotation mechanism before discharge, more chemical substances are present on the discharge side. Therefore, it is possible to realize efficient decomposition and removal of chemical substances, which is preferable.

  As described above, according to the gas purification apparatus of the present invention, after removing the particulate matter contained in the gas to be treated, the chemical substance is adsorbed by the adsorbent having the honeycomb structure, and is provided in close contact with the adsorbent. Discharge occurs between the electrode and the discharge electrode provided opposite the adsorbent, and is present in the atmosphere or on the adsorbent surface by the discharge generated in the space formed by the adsorbent and the discharge electrode. When the chemicals collected by the adsorbent are decomposed and removed by the active species generated by the reaction of moisture, the surface is treated with the pressure loss and ions of the gas flow during chemical concentration. Ion mobility is preferable, and since no discharge occurs between the adsorbent and the supply electrode, it is possible to prevent discharge on the leeward side of the adsorbent, and the chemical substance is efficiently adsorbed by the adsorbent. Both chemicals are efficiently decomposed by radicals that are generated by the reaction of radicals or moisture are generated by the discharge. In addition, the chemical substance is substantially concentrated by being adsorbed by the adsorbent, and the decomposition efficiency of the chemical substance by the radical generated by the reaction with the radical generated by the discharge or moisture is improved. As a result, it is possible to provide a gas purification device that can decompose and remove chemical substances with high efficiency, is inexpensive, and is easy to maintain.

Embodiment 2
FIG. 17 is a configuration explanatory view showing another example of the gas purification apparatus according to the present invention. The gas purification apparatus according to the present embodiment is different from the apparatus shown in the first embodiment in the configuration of the discharge unit. That is, in Embodiment 1, radicals are generated by discharge, but in this embodiment, radicals are generated by irradiating a metal frame with ultraviolet rays.

  The radical generation mechanism is as follows. That is, when the ultraviolet lamp 21 is turned on and ultraviolet rays are emitted, the emitted ultraviolet rays reach the metal frame 22 and electrons are ejected from the metal frame 22 by the photoelectric effect of the ultraviolet rays. The electrons adhere to oxygen molecules in the atmosphere and negative ions (radicals) are generated. At this time, if the blower 2 blows air from right to left in the figure, the generated negative ions are released out of the metal frame 22 toward the adsorbent 3, and the reaction mechanism shown in the first embodiment. The chemical substance adsorbed on the adsorbent 3 is decomposed. As a material of the metal frame 22, a metal having a low work function, which is usually an optoelectronic material, that is, a metal that easily emits electrons is appropriate, and gold, titanium, and the like correspond to this.

  Further, the negative ions disappear when they come into contact with the particulate matter existing in the space or the surface of the metal cylinder, but the particulate matter is previously removed by the filter 7, and the blowing action by the blower 2 and the adsorbent 3. Due to the ion acceleration action by the electric field from the adsorbent 3 formed between the adsorbent 3 and the metal frame 22 to the metal frame 22, the contact opportunity between the negative ions and the metal frame is suppressed. Furthermore, if moisture exists on or near the surface of the adsorbent 3, negative ions and moisture react to generate new radicals (active species) having high activity such as hydroxyl radicals, and decompose chemical substances. Is as shown in the first embodiment.

  In the above embodiment, the case where radicals are generated by using electrons emitted by the ultraviolet lamp 21 and the metal frame 22 has been described. However, radicals are generated by using electrons released into the space by ultraviolet irradiation and discharge. However, the same chemical substance decomposition effect can be obtained. FIG. 18 is a perspective view showing a configuration example when the ultraviolet lamp 21 is provided in the configuration shown in FIG.

  As described above, according to the gas purification apparatus of the present invention, the negative ions (radicals) are generated by the ultraviolet lamp, and the chemical substance is decomposed by the negative ions or the radicals generated by the negative ions and moisture, so that Embodiment 1 In combination with the effects shown in (1), a gas purification device with a simple configuration and easy maintenance is realized.

Embodiment 3
FIG. 19 is a configuration explanatory view showing another example of the gas purification apparatus according to the present invention. The gas purification apparatus according to this embodiment differs from the apparatus shown in FIG. 1 in that a dehumidifying device 31 is provided between the filter 7 and the blower 2. That is, in the present embodiment, the gas that has passed through the filter 7 is dried by the dehumidifier 31, and the dehumidified water is sucked out by the pump 32, passes through the nozzle 33, and is introduced to the vicinity of the adsorbent 3. It is configured to be written. By adopting such a configuration, it is possible to prevent radicals from being generated in the vicinity of the metal electrode 1 due to a reaction with moisture, and it is possible to efficiently generate radicals in the vicinity of the adsorbent 3.

  On the other hand, since moisture is introduced in the vicinity of the adsorbent 3, ions and electrons generated in the space by the discharge react with the moisture in the vicinity of the adsorbent 3, and as described above, active species such as hydroxyl radicals. Are generated and these radicals are subjected to chemical decomposition. Note that these radicals are active and disappear by reacting with the particulate matter present in the atmosphere or spontaneously decomposing while drifting in the atmosphere. It can be efficiently used for decomposition of chemical substances. Further, moisture adsorbed on the surface of the adsorbent 3 improves the electrical conductivity of the surface of the adsorbent 3 and has an effect of facilitating the adjustment of the potential by the potential adjusting means 5.

Next, the influence that the amount of water in the processing gas has on the chemical substance decomposition when the chemical substance is decomposed by causing a discharge between the adsorbent 3 and the metal electrode 1 will be described. FIG. 20 shows a process using air containing formaldehyde, which is one of the substances causing sick house syndrome, with a hydrophilic zeolite or other adsorbent supporting MnO ₂ catalyst at a temperature of 25 ° C. and a relative humidity of 40% and 80%. It is the figure which compared the decomposition | disassembly characteristic of the chemical substance in the atmosphere of%. In the figure, the vertical axis represents formaldehyde concentration (ppm) and the horizontal axis represents elapsed time (min). In the test, formaldehyde-containing air whose formaldehyde concentration was adjusted to 1 ppm using a closed container having a capacity of 72 liters was treated by applying a negative high voltage to the metal electrode 1 of the above-described gas purification apparatus, The time change of the concentration was measured with a formaldehyde measuring instrument (XP-308-2 manufactured by Shin Cosmos Electric).

  Comparing the formaldehyde concentration in the atmosphere with relative humidity of 40% indicated by 116 in the figure and the formaldehyde concentration in the atmosphere with relative humidity of 80% indicated by 117 in the figure, the concentration of formaldehyde after the passage of a certain time is relative humidity. It is lower in the case of 80% atmosphere, indicating that the decomposition performance is increased by increasing the relative humidity. As described above, it was found that in order to decompose a chemical substance using a discharge generated between the adsorbent and the metal electrode, the chemical substance can be decomposed more efficiently by increasing the water concentration in the processing gas.

  In the above embodiment, the moisture in the taken processing gas is removed and humidified using the removed moisture, and radicals are efficiently generated in the vicinity of the adsorbent, but a humidifier is newly provided. Even if the vicinity of the adsorbent 3 is humidified, the same chemical substance decomposition effect can be obtained. FIG. 21 shows an example where a humidifier 34 is additionally installed in the configuration shown in FIG.

  As described above, a dehumidifying device is installed between the particulate matter removal filter and the ion blower fan to dehumidify the water and guide the water to the vicinity of the adsorbent. Radicals generated by the reaction of moisture are generated in the vicinity of the chemical substance. That is, according to the gas purification apparatus according to the present invention, the decomposition efficiency of the chemical substance by the radicals generated by the discharge and the radicals generated by the reaction of the water by the discharge is improved. In addition to the effect, a gas purification device capable of decomposing chemical substances at a lower cost is realized.

Embodiment 4
FIG. 22 is a configuration explanatory view showing another example of the gas purification apparatus according to the present invention. The gas purification apparatus according to this embodiment is different from the apparatus shown in FIG. 1 in that a gas composition adjusting device 41 is provided. That is, in the present embodiment, the gas can be blown out uniformly between the metal electrode 1 and the adsorbent 3 so that the gas composition of the atmosphere constituting the metal electrode 1 and the adsorbent 3 is rich in O _2. A gas supply plate 42 is provided, and a gas having a predetermined composition is supplied from the gas composition adjusting device 41. As a result, the active species derived from oxygen are generated more efficiently and in a large amount by the discharge between the metal electrode 1 and the adsorbent 3 than in the normal atmosphere.

Examples of the gas composition adjustment device 41 include an oxygen permeable membrane oxygen enrichment device, a PSA type oxygen generator, and a cryogenic separation type oxygen generator, and a combination of oxygen gas cylinders. It doesn't matter.
In the above embodiment, the case where the gas supply plate 42 is provided on the windward side of the metal electrode 1 has been described. However, even if the gas insertion pipe 43 is separately provided and the gas is supplied from one place, the self-concentration diffusion of the gas Due to the action, a uniform gas can be supplied to the adsorbent 3. FIG. 23 shows an example in which a gas insertion tube 43 is additionally installed in the configuration shown in FIG.

As described above, according to the gas purifying apparatus according to the present invention, by adjusting the gas composition of the atmosphere comprising between adsorbent and a metal electrode, in gas composition adjusting device 41 so that O ₂ is rich, metal electrodes As a result of the discharge between the adsorbent 1 and the adsorbent 3, active species derived from oxygen are generated more efficiently and in a larger amount than in the normal atmosphere. In addition to the effects shown in the first embodiment, the adsorbent The adsorbed chemical is decomposed more efficiently and is preferable.

Embodiment 5
FIG. 24 is a configuration explanatory view showing another example of the gas purification apparatus according to the present invention. The gas purification apparatus according to this embodiment is different from the apparatus shown in FIG. 1 in that a MnO ₂ supporting electrode 51 is provided on the leeward side of the adsorbent 3 and the supply electrode 4 for adjusting the potential of the adsorbent 3 is omitted. Is different. That is, in the present embodiment, the adsorbent 3 is sandwiched between the metal electrode 1 and the MnO ₂ supporting electrode 51, a high voltage is applied to the MnO ₂ supporting electrode 51 by the high voltage power source 6, and the potential adjusting device 5 The potential is set to zero potential. As a result, it is possible to cause a discharge at a site downstream of the adsorbent 3 and to decompose the chemical substance adsorbed on the adsorbent 3 more efficiently. Even in such a structure, ozone and nitrogen oxides, which are long-lived discharge products generated in the downstream part of the adsorbent 3, are decomposed by the catalytic action of MnO ₂ supported on the surface of the MnO ₂ supported electrode 51. In other words, discharge products are not released to the outside. Therefore, the chemical substance adsorbed on the adsorbent 3 can be decomposed more efficiently without discharging discharge products to the outside.

As such MnO ₂ carrying electrode 51, for example, it can be used carrying MnO ₂ strong metal honeycomb and the surface of the mesh oxidation such as stainless steel. Such a monolith can be obtained, for example, by immersing a metal honeycomb in a slurry-like solution in which, for example, MnO ₂ is dissolved and firing it at an appropriate temperature after drying.
In the above embodiment, the case where the MnO ₂ supported electrode 51 is simply provided on the downstream side of the adsorbent 3 has been described. However, even if the MnO ₂ supported electrode 51 is heated by the heating device, ozone or nitrogen oxides are used. The discharge products such as can be decomposed more efficiently. FIG. 25 shows an example in which a heating device 52 is additionally installed in the configuration shown in FIG.

As described above, according to the gas purification apparatus of the present invention, the adsorbent 3 is sandwiched between the metal electrode 1 and the MnO ₂ supporting electrode 51, a high voltage is applied to the MnO ₂ supporting electrode 51 by the high voltage power source 6, and the potential adjusting device 5 Since the discharge is performed by setting the potential of the metal electrode 1 to zero potential, the discharge can be performed at the downstream portion of the adsorbent 3 without discharging the discharge product to the outside. In addition to the effects shown above, the chemical substance adsorbed on the adsorbent is more efficiently decomposed, which is preferable.

Embodiment 6
FIG. 26 is a configuration explanatory view showing another example of the gas purification apparatus according to the present invention. The gas purification apparatus according to this embodiment differs from the apparatus shown in FIG. 1 in that a concentrating adsorbent 61 is provided on the windward side of the metal electrode 1. That is, by providing a concentrating adsorbent 61 on the upstream side of the metal electrode 1 and repeating the adsorption and desorption of the chemical substance so that the gas composition of the atmosphere constituting the metal electrode 1 and the adsorbent 3 is rich in the chemical substance. A gas containing a high concentration of chemical substances is supplied. This increases the probability of collision between the radical generated by the discharge between the metal electrode 1 and the adsorbent 3 and the chemical substance, and radicals that disappear without colliding with the chemical substance compared to the case where the chemical substance is not concentrated. It will be greatly reduced. Examples of means for releasing the concentrated chemical substance from the concentration adsorbent 61 include a pressure swing method and a temperature swing method.

  As mentioned above, according to the gas purification apparatus concerning this invention, the adsorption agent 61 for concentration is provided in the windward side of the metal electrode 1 so that the gas composition of the atmosphere which comprises between a metal electrode and adsorption agent may become a chemical substance rich. As a result, the probability of collision between the radical generated by the discharge between the metal electrode 1 and the adsorbent 3 and the chemical substance is increased, and radicals that disappear without colliding with the chemical substance are significantly larger than when not concentrated. In addition to the effects shown in the first embodiment, the chemical substance adsorbed by the adsorbent is decomposed more efficiently, which is preferable.

It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a structure explanatory drawing explaining the structure of the adsorption agent of the gas purification apparatus concerning this invention. It is a structure explanatory drawing explaining the structure of the adsorption agent of the gas purification apparatus concerning this invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a figure which shows the time change of the acetic acid decomposition amount when ion irradiation is carried out to an acetic acid solution. It is a figure which shows the time change of the formaldehyde density | concentration at the time of adsorb | sucking formaldehyde containing gas. It is a figure which shows the time change of the formaldehyde density | concentration when discharge-treating formaldehyde containing gas. It is a figure which shows the time change of the formaldehyde density | concentration when discharge-treating formaldehyde containing gas. It is a figure which shows the time change of the removal rate of formaldehyde when formaldehyde containing gas is discharge-processed. It is a figure which shows the relationship of the residual rate of formaldehyde when a formaldehyde containing gas is discharge-processed, the nitrogen oxide density | concentration in a container, and discharge electric power. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a figure which shows the time change of the formaldehyde density | concentration when discharge-treating formaldehyde containing gas. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention. It is a configuration explanatory view explaining the configuration of the gas purification apparatus according to the present invention.

1 metal electrode, 2 blower, 3 adsorbent, 4 supply electrode, 5 potential adjustment device,
6 High voltage power supply, 7 Filter, 8 Gas to be processed, 11 Mobile discharge electrode,
12 needle electrode, 13 brush electrode, 14 temperature controller,
21 UV lamp, 22 metal frame, 31 dehumidifier, 32 pump,
33 humidifying nozzle, 34 humidifying device, 41 gas composition adjusting device,
42 gas supply plate, 43 gas insertion tube, 51 MnO ₂ supported electrode,
52 heating device, 61 adsorbent for concentration,
101 Relationship between the amount of acetic acid decomposed and the treatment time when the acetic acid concentration is high,
102 Relationship between the amount of acetic acid decomposition and treatment time when the acetic acid concentration is low,
103 Relationship between formaldehyde concentration and treatment time when using hydrophobic zeolite,
104 Relationship between formaldehyde concentration and treatment time when activated carbon is used,
105 Relationship between formaldehyde concentration and treatment time when hydrophilic zeolite is used,
106 Relationship between formaldehyde concentration and treatment time when using MnO ₂ -supported hydrophobic zeolite
107 Relationship between formaldehyde concentration and treatment time when using MnO ₂ -supported hydrophilic zeolite,
108 Relationship between formaldehyde concentration and treatment time without discharge,
109 Relationship between formaldehyde concentration and treatment time when negative voltage is applied,
110 Relationship between formaldehyde concentration and treatment time when positive voltage is applied,
111 Relationship between formaldehyde decomposition and discharge power when positive voltage is applied,
112 Relationship between formaldehyde decomposition and discharge power when negative voltage is applied,
113 Relationship between formaldehyde residual rate and discharge energy,
114 Relationship between nitrogen oxide concentration and discharge energy,
115 Relationship between formaldehyde concentration and treatment time without discharge,
116 Relationship between formaldehyde concentration and treatment time at 40% relative humidity
117 Relationship between formaldehyde concentration and treatment time at 80% relative humidity.

Claims (5)

Particulate matter separation means for separating the particulate matter from a gas containing particulate matter and a chemical substance;
An adsorbent having a honeycomb structure that adsorbs the chemical substance contained in the gas;
A supply electrode provided in close contact with the adsorbent;
A discharge electrode provided opposite to the adsorbent;
A potential adjusting means for adjusting the potential of the supply electrode;
A high-voltage power supply for supplying a high voltage to the discharge electrode,
Captured by the adsorbent by active species generated by the reaction of moisture present in the atmosphere or the surface of the adsorbent by the discharge generated in the space formed by the adsorbent and the discharge electrode. A gas purification apparatus characterized by decomposing and removing the chemical substance. The gas purification apparatus according to claim 1, wherein the supply electrode is made of a metal plate having an opening and is in close contact with the lee of the adsorbent. The gas purification apparatus according to claim 1, wherein the potential of the supply electrode is zero. The gas purification apparatus according to claim 1, wherein the adsorbent is a hydrophilic zeolite carrying MnO ₂ . The ultraviolet ray generator for supplying ultraviolet light to a discharge space formed by the adsorbent and the discharge electrode is provided upstream of a discharge space formed by the adsorbent and the discharge electrode. Gas purification equipment.

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