KR100458808B1 - Device for purification treatment of exhaust gas - Google Patents

Abstract

The present invention can redox and decompose environmental pollutants, such as dioxin, coplanar-PCB, etc., through the photocatalytic action of photocatalysts, and purify them to the extent that they can be released into the atmosphere. In addition, the present invention also provides an apparatus for purifying exhaust gas that can be installed in a large incinerator already installed.

Therefore, the rectangular filter tank 20 in which the connecting member 10 is connected to the exhaust gas supply passage and continuously connected, and the filter medium 25 is filled therein, and the heat resistant member 21 is passed through the filter tank 20. The photocatalyst tank 30 which is detachably connected continuously with or without through and the photocatalyst particles are filled therein, and the exhaust member 40 which is continuously connected with or without the heat resistant member 41 to the photocatalyst tank 30. And a plurality of casings 33 penetrating the inside of the photocatalyst tank 20 in a cylindrical shape having ultraviolet permeability, and mounted in each casing 30 to provide the photocatalyst particles. The photocatalyst extraction hole 31 is formed in the lower end of the side wall of the photocatalyst tank 20, and the bottom surface of the photocatalyst extraction hole 31 is formed at the center of the photocatalyst extraction hole 31. ) Lower side Facing is formed in the inclined hapgak head shape or a square shape or WOOJIN.

Description

Exhaust Gas Purification System {DEVICE FOR PURIFICATION TREATMENT OF EXHAUST GAS}

The present invention can oxidatively decompose environmental pollutants such as dioxin and the like at the high temperature state by photocatalytic reaction among the combustion exhaust gas discharged from the incinerator, and can also be installed in a large incinerator already installed. An apparatus for purifying exhaust gas.

An apparatus for purifying exhaust gas for treating combustion exhaust gas discharged from an incinerator, in which an electrostatic precipitator, a bug filter or a cyclone is installed in a combustion exhaust gas discharge path to remove dust in the combustion exhaust gas, or activated carbon or It is known to provide an adsorbent such as activated coke to adsorb and remove dioxin, coplanar-PCB, etc. in combustion exhaust gas.

In Japanese Patent Laid-Open No. 5-285342, a photocatalyst is mixed into a combustion exhaust gas and introduced into an exhaust gas decomposing tower, and ultraviolet rays are irradiated with a low pressure mercury lamp in the exhaust gas decomposing tower, and a dust collector connected to the exhaust gas decomposing tower is provided. A device for recovering a photocatalyst is disclosed.

However, according to the apparatus described in Japanese Patent Application Laid-Open No. 5-285342, since the photocatalyst is mixed in the combustion exhaust gas and the transparency of the exhaust gas cannot be enhanced so much, the photocatalyst present in a region relatively close to the light source can exhibit sufficient function. Although the photocatalyst separated from the light source to a certain extent can hardly be irradiated with excitation light, its function cannot be sufficiently exhibited, and the overall efficiency of the exhaust gas treatment by the photocatalyst is significantly reduced.

In addition, a dust collector is required to separate and recover the photocatalyst from the decomposed gas after the treatment, and there is also a problem that the apparatus is complicated and expensive.

On the other hand, in an apparatus for recovering and removing harmful substances such as dioxins in the combustion exhaust gas by installing an electrostatic precipitator, a bug filter, or a cyclone, among the dioxins contained in the combustion exhaust gas, dust contained in the dust is removed together with the dust. Although there was a problem, it was not possible to remove dioxins or low-boiling gaseous dioxins attached to very fine flying ashes.

In addition, when the exhaust gas discharged from the incinerator is hot, for example, when collecting and removing such harmful substances with a dust collector, it is necessary to quench using a cooling device before introduction into the dust collector, and the apparatus becomes complicated and expensive. The same applies to devices using bug filters or cyclones.

For this reason, the introduction of oxidative decomposition or reduction decomposition by metal catalysts, such as titanium, vanadium, and platinum as an auxiliary means, is proposed. However, according to the oxidative decomposition or reduction decomposition by a metal catalyst, since the effective temperature atmosphere is near 230 degreeC and narrow, as described above, after quenching the combustion exhaust gas using a cooling apparatus, it is introduced into a dust collector, a bug filter, and a cyclone. Therefore, it is very cumbersome to control the temperature of the combustion exhaust gas, such as the need to heat the cooled combustion exhaust gas again to a high temperature.

In addition, in the treatment with an adsorbent such as activated carbon or activated coke as described above, in theory, gas boiling dioxins of low boiling point can be removed, but secondary treatment of used waste adsorbents that adsorb dioxins is required, and the combustion exhaust gas temperature is increased. If it is higher than 150 ° C, dioxins that have been adsorbed may be desorbed and released, or the adsorption performance of activated carbon may be deteriorated, so that desired adsorption and removal may not be performed, or the flue gas temperature fluctuates. Various problems are presently present, such as dioxin desorption and re-flying in combustion exhaust gas.

The present invention has been made in view of the above problems, and its object is to produce environmental pollutants such as dioxin, coplanar-PCB, etc., among the exhaust gases discharged from an incinerator, by photocatalytic action of a photocatalyst. It is an object of the present invention to provide a purification apparatus for exhaust gas that can be redoxed, purged to the extent that it can be released into the atmosphere, and can be installed in a large incinerator already installed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows roughly the external appearance shape when the exhaust gas purification processing apparatus which concerns on this invention is assembled.

FIG. 2 is a plan view of the connection member of FIG. 1. FIG.

3 is a side view schematically showing the purification apparatus of FIG. 1, the filter tank is partially broken, and only a part of the filter medium is shown.

4 is a perspective view of the photocatalyst tank unit of FIG. 1.

FIG. 5 is a front sectional view of the photocatalyst tank monolith of FIG. 1, with no photocatalyst particles shown.

FIG. 6 is a plan view of the photocatalyst monolith of FIG. 1, with the photocatalyst particles not shown.

Explanation of symbols on the main parts of the drawings

1: purification apparatus for exhaust gas 3: exhaust gas supply passage

5: photocatalytic particles 10: connecting member

12 intake port 14 heat-resistant sealing material

20: filter tank 21: heat resistant sealing material

22: shelf material 25: filter medium

30: photocatalyst tank 30a: photocatalyst tank

31: photocatalyst extraction hole 32: bottom surface

33 casing 34 light source

34 ': Sterilization lamp 34 ": Black light

35: heat resistant sealing material 40: exhaust member

41: heat resistant sealing material 42: discharge port

Therefore, the means adopted by the present invention is the invention of claim 1, wherein the filter member has a rectangular filter tank in which a connecting member is connected to the exhaust gas supply passage and continuously connected, and a filter medium is filled therein, and the filter tank is provided with or without a heat resistant member. A photocatalyst tank comprising a photocatalyst tank detachably detached and filled with photocatalyst particles therein and an exhaust member continuously connected to the photocatalyst tank with or without a heat resistant member, wherein the photocatalyst tank is UV-transmissive. The gist of the present invention includes a plurality of casings penetrating the inside of the photocatalyst tank having a cylindrical shape and a light source mounted in each casing to emit excitation light of the photocatalyst particles.

The invention according to claim 2, wherein in the invention according to claim 1, the photocatalyst extraction hole is formed at the lower end of the sidewall of the photocatalyst tank, and the bottom surface is a haptic head shape inclined toward the lower side of the photocatalyst extraction hole at the center or right-angled roof. The thing formed in the shape makes it the summary.

According to the invention of claim 3, in the invention of claim 1 or 2, the plural of the single photocatalyst tanks are connected in series with or without a heat resistant member.

The invention of claim 4 is to provide the exhaust gas without supplying temperature to the photocatalyst tank according to the invention according to any one of claims 1 to 3.

The invention according to claim 5, wherein the light source is a combination of a germicidal lamp and a black light according to the invention of any one of claims 1 to 4.

The invention according to claim 6, wherein the filter medium comprises any one of spherical ceramics or silica gels having a particle diameter of 5 to 25 mm that is alkali-treated. It is.

The invention according to claim 7 is to provide the air blowing means for blowing air toward the casing in order to air cool the light source. .

The invention according to claim 8, wherein the photocatalyst particles are formed of a titanium oxide film on the surface of the porous body or the porous ceramic carrier in which the surface of the porous metal carrier is coated with a titanium oxide film. Any of the porous bodies coated with this is made into the summary.

The invention of claim 9 is, in the invention of claim 8, the porous ceramic carrier is any one selected from the group consisting of activated carbon, activated alumina, silica gel, and porous glass.

The invention according to any one of claims 1 to 7, wherein the photocatalyst particles are any one of a woven fabric, a nonwoven fabric, a knitted fabric, and various other fibrous structures having heat-resistant fibers whose surface is coated with a titanium oxide coating. Is to the point.

The invention according to claim 11, wherein the photocatalyst particles comprise platinum, rhodium, ruthenium, barium, iron, silver, copper, or zinc in the invention according to any one of claims 8 to 10. It is made into the summary that it further coats with any 1 type of metal film selected from the group.

The invention according to claim 12, wherein the crystal form of the titanium oxide film is anatase in the invention according to any one of claims 8 to 11.

According to the apparatus for purifying exhaust gas according to the invention described in each claim employing such a structure, the exhaust gas discharged from the incinerator can be continuously supplied to the photocatalyst tank and brought into contact with the photocatalyst. Moreover, since the photocatalyst tank is provided with the light source which irradiates the excitation light which excites a photocatalyst in the cylindrical casing which has ultraviolet permeability | transmission, an excitation light can be irradiated to a photocatalyst and photoexcitation can be carried out, Since the excitation action due to heat excitation is added and this acts synergistically, even when the exhaust gas is directly contacted without temperature control, environmental pollutants such as dioxin, in particular, can be efficiently oxidized and decomposed (harmless). Can be made).

Unlike conventional purifiers using dust collectors, bug filters, cyclones, etc., the exhaust gas discharged from the incinerator does not need to be quenched using a cooling device, or the cooled exhaust gas is heated again to a high temperature. Temperature management of the exhaust gas becomes unnecessary. Moreover, unlike the apparatus which adsorb | sucks with an adsorbent, such as activated carbon and activated coke, secondary processing of the used waste adsorbent becomes unnecessary.

Particularly, according to the invention of claim 2, the bottom surface of the photocatalyst tank is formed in the shape of a haptic head or inclined angle at the center portion, and the photocatalyst extraction hole is formed in the vicinity of the connection portion between the bottom surface and the side wall. Through, the used photocatalyst particles can be easily recovered. It goes without saying that the used photocatalyst particles can be recycled by washing and reused.

According to the invention of claim 4, since the exhaust gas is supplied to the photocatalyst tank without temperature control in addition to the operation of the invention of each claim, troublesome temperature management of the exhaust gas is unnecessary. That is, a cooling device for quenching the exhaust gas and a heating device for the cooled combustion exhaust gas are not necessary again, and the high contrast of the whole device is simplified.

According to the invention of claim 5, the light source employs a structure using a sterilizing lamp which emits ultraviolet rays having a maximum wavelength near 254 nm and a black light emitting ultraviolet rays having a maximum wavelength near 380 nm. The surface of the photocatalyst particles can be excited by the ultraviolet rays emitted from the germicidal lamp. Since the ultraviolet rays emitted from the black light pass through the photocatalytic particles, the photocatalyst can be sufficiently irradiated with the photocatalyst located on the opposite side to the light source. Can work. That is, the active species (superoxide ion (O ₂ ⁻ ) or hydroxyl radical (· OH)) having excellent reactivity can be formed on all of the photocatalyst particles filled in the photocatalyst tank, thereby redoxing environmental pollutants in the exhaust gas. Can be disassembled.

According to the invention of claim 7, in addition to the function of the exhaust gas treatment apparatus described in each of the claims, in particular, since the light source is mounted to be air-cooled in the cylinder, the life of the light source can be extended.

According to the invention of claim 8 or 9, since photocatalyst particles having a titanium oxide film having a simple surface area with a simple manufacturing are used, oxidation of environmental pollutants in exhaust gas, in addition to the action indicated by the above-described claims, The decomposition treatment performance can be improved.

According to the invention of claim 10, the action substantially the same as that of the invention of claim 8 or 9 is obtained.

According to the invention of claim 11, in addition to the action exhibited by the invention of each claim, oxidative decomposition and reductive decomposition by a metal catalyst can be exerted synergistically.

According to the invention of claim 12, in addition to the action exhibited by the invention of each claim, the photocatalytic action superior to that of the rutile type and the brookite type can be obtained because the crystal form of the titanium oxide film is an anatase type.

Although the embodiment of the waste gas purification processing apparatus which becomes this invention is described in more detail based on the specific example shown in drawing, this is shown to the representative thing and this invention is based on the following example, unless the summary is exceeded. It is not limited.

In the present invention, the photocatalytic particles are coated or supported with photocatalyst fine particles on the surface of the porous carrier or on the surface of a woven fabric, nonwoven fabric, knitted fabric or various other fibrous structures made of heat resistant fibers. Examples of porous carriers include representative porous metals such as nickel cadmium, stainless steel, permalloy, aluminum alloy and copper, and porous ceramics represented by activated carbon, activated alumina, silica gel, porous glass, and the like. It is preferable to use a porous cerasmix such as activated carbon, activated alumina, silica gel and the like as a carrier from the viewpoint of the large size and the cost. The shape of the porous carrier may be any shape, such as granular, plate, cylindrical, square, conical, spherical or rugby ball. Moreover, as long as the said heat resistant fiber is a fiber which has the heat resistance characteristic of 400 degreeC or more, More preferably, about 800 degreeC, organic fiber or an inorganic fiber may be sufficient. In view of having excellent heat resistance properties, inorganic fibers represented by glass fibers, alumina fibers, aluminosilicate fibers, silicon carbide fibers and the like are preferred.

Photocatalyst refers to the excitation (photoexcitation) of electrons in the lower electron band when irradiating light (excitation light) having a larger energy (that is, shorter wavelength) than the energy gap between the conduction band and the valence band of the crystal, Examples of the material capable of generating conduction electrons and holes include titanium oxide, tin oxide, zinc oxide, vanadium oxide, bismuth trioxide, tungsten trioxide, ferric oxide, strontium titanate, and cadmium sulfide. One or two or more of these can be used. It is preferable to use titanium oxide in the point which exhibits the outstanding photocatalytic effect compared with other things. As the crystalline titanium oxide, there are anatase type, rutile type, and brookite type. Any of these may be used, but from the viewpoint of showing the best photocatalytic action, it is preferable to use anatase type titanium oxide. Very preferred.

However, when ultraviolet rays are irradiated to the photocatalyst and photoexcited, electron-hole pairs are generated on the surface of the photocatalyst. Among these, the electrons reduce the surface oxygen to generate superoxide ions (O ₂ ⁻ ), and the holes oxidize the surface hydroxyl groups to generate hydroxyl radicals (· OH). Furthermore, these active species (superoxide ion (O ₂ ⁻ ) or hydroxyl radical (.OH)), which are excellent in reactivity, can efficiently and reliably redox decomposed pollutants in the combustion exhaust gas. Can).

In the embodiment according to the present invention, when the photocatalyst is titanium oxide, the photocatalyst is a dip coating method or a dropping method, for example, a titania sol obtained by suspending titanium oxide fine particles with water or a titania sol obtained by hydrolysis of an organic titanate. It is produced by coating the surface of the porous carrier described above by a spray method or the like and heating it.

In addition, a metal film such as platinum, rhodium, ruthenium, palladium, iron, silver, copper, and zinc is further deposited on the surface of the titanium oxide film covering the surface of the porous carrier, such as photoelectric deposition, CVD, sputtering, vacuum deposition, or the like. Can be coated by PVD method or the like, thereby facilitating charge separation of electrons or holes, promoting redox decomposition by photocatalytic action, and assisting oxidative decomposition or reduction decomposition by the metal catalyst as an auxiliary means. Can be introduced.

Further, the photocatalyst fine particles can be coated or supported on the surface of a woven fabric, nonwoven fabric, knitted fabric or various other fiber structures having heat resistance by the same manufacturing method as described above.

More specifically, the light source may be sterile lamp, black light, fluorescent lamp, incandescent lamp, mercury lamp, UV light, xenon lamp, halogen lamp, metal halide lamp or the like. In addition, when a combination of a sterilizing lamp that emits ultraviolet rays having a maximum wavelength near 254 nm and a black light that emits ultraviolet rays having a maximum wavelength near 380 nm is used as a light source, the surface of the photocatalytic particles is exposed to ultraviolet rays emitted from the germicidal lamp. It can be excited, and the ultraviolet rays emitted from the black light can pass through the photocatalyst particles to the inside. That is, sufficient excitation light can be irradiated to all the photocatalyst particles filled in the photocatalyst tank 20, and the photocatalyst can be fully excited.

Moreover, although the structure which opens only one end of a casing may be open | released outside, since the light source can be cooled by air when both ends open together, the air cooling blower which blows air for air cooling from one end to another end (blow means) If the external shell is enclosed, the light source can be cooled more effectively and the light source life can be extended, which is very preferable.

In the present specification, the term "titanium oxide" is any one selected from the group consisting of titanium oxide, silica oxide, zinc oxide, vanadium oxide, bismuth trioxide, tungsten trioxide, ferric trioxide, strontium titanate, and cadmium sulfate. It may be replaced with a species or a mixture of two or more kinds.

(Example)

Hereinafter, the exhaust gas purification processing apparatus 1 which embodies this invention further is demonstrated.

The exhaust gas purifying apparatus 1 intends both sides of the incinerator to be installed as an essential structural unit and to be attached after the year of the already installed incinerator. However, it is preferably detachably mounted.

Fig. 1 is an external perspective view schematically showing the entire assembly of the exhaust gas purifying apparatus 1 according to the embodiment. FIG. 2 is a plan view of the connecting member 10, FIG. 3 is a side view schematically showing the entire purification apparatus 1 of FIG. 1, the filter tank 20 is partially broken, and only a part of the filter medium is shown. have. 4 is a perspective view of the photocatalyst tank monolith of FIG. 1, FIG. 5 is a front cross-sectional view of the photocatalyst tank monolith of FIG. 1, FIG. 6 is a plan view of the photocatalyst tank monolith of FIG. 1, and all of the photocatalyst particles are not shown.

In the figure, the purification apparatus 1 includes a rectangular filter tank 20 in which a connecting member 10 is connected to the exhaust gas supply passage 3 and continuously connected thereto, and the filter medium 25 is filled therein; The photocatalyst tank 30 in which the heat-resistant member 21 is detachably and airtightly connected to the filter tank 20 in a detachable manner, and the photocatalyst particles 5 are filled therein, and the photocatalyst tank 30 ) Is provided with the exhaust member 40 which is airtightly connected continuously or without the heat-resistant sealing material 41, and the single photocatalyst tank 30 is laminated | stacked in three layers.

The connecting member 10 is a heat-resistant stainless steel product and has an inlet 12 formed in the same dimension as the cross section of the exhaust gas supply passage 3, and a lower opening formed in the same dimension as the cross section of the filter tank 20 (shown in FIG. The heat-resistant sealing material 14 is provided between the exhaust gas supply path 3 and the filter tank 20.

The filter tank 20 is also made of heat-resistant stainless steel, and its outer shape is box-shaped, and a shelf member 22 formed in a mesh shape and filled with the filter medium 25 is embedded therein. The filter medium 25 is either ceramic balls or silica gel balls having a particle size of 5 to 25 mm subjected to alkali treatment, and the photocatalyst particles can be mixed as necessary. In addition, the alkali-filtered filter medium 25 has an effect of neutralizing hydrogen chloride.

Next, the photocatalyst tank 30 is also a heat-resistant stainless steel product, which is formed in a dimension of 1500 x 1500 x 500 mm, and has a photocatalyst particle coated with a photocatalyst (titanium oxide film) on the surface of a transparent silica gel. 5) is filled with 1100 liters. As shown in FIG. 4, the photocatalyst extraction hole 31 for taking out photocatalyst particle at the time of exchanging photocatalyst particle is formed in the vicinity of the connection part of a bottom surface and a side wall. The bottom surface 32 is formed in the shape of the angled head or the right angle inclined at the center portion and is connected to the side wall above the photocatalyst extraction hole 31. In addition, a plurality of casings 33 are spaced at substantially equal intervals so as to penetrate the inside thereof, and sterilization lamps 34 'and black lights 34 " It is attached so as to be in another positional relationship (lattice-like positional relationship).

The casing 33 is a hollow cylindrical quartz glass product, but may be formed using a transparent, UV-transparent, heat-resistant material, and other than quartz glass products, such as molten quartz glass products or hard glass products, A light transmissive alumina product may be sufficient.

When the photocatalyst extraction hole 31 is opened, since the bottom surface 32 is formed in the shape inclined in the center part, the photocatalyst particle 5 can be easily recovered through the photocatalyst extraction hole 31, and regeneration Can be processed. The photocatalyst tank 30 is removed from the filter tank 20, and the regenerated photocatalyst particles 5 are filled, and then both are assembled. By repeating these processes, cumbersome replacement of the photocatalyst particles 5 can be performed easily, and the photocatalyst particles 5 can be regenerated and used repeatedly.

The exhaust member 40 is a member that is hermetically connected to the lower end of the photocatalyst tank 30 farthest from the exhaust gas supply passage 3 through or without heat-resistant sealing material 41, and has an overall shape. Is substantially the same as the connecting member 10, but has a discharge port 42 for processing gas.

In the purification processing apparatus 1, three tanks of the single photocatalyst tank 30 are hermetically connected and connected in series via the heat resistant seal 35, but the connection quantity of the photocatalyst tank 30, the cross-sectional shape, and the overall dimensions thereof. The shape and the like are matters that can be appropriately changed based on the processing capacity of each incinerator.

Next, a purification treatment apparatus 1 including a photocatalyst tank in which three photocatalyst tanks are connected to a chimney of an incinerator installed in an industrial waste treatment facility is connected, and an exhaust gas supply passage (inlet) and an outlet port ( The concentration of dioxins in the exhaust gas collected at each outlet) and the coplanar-PCB concentrations subject to new regulation under the Special Measures Act were measured at intervals of one month and one week. The dioxin concentration was measured in accordance with the Ministry of Health, Labor and Welfare "Dioxin Standard Measurement in Waste Treatment" (February 9, 2017). As described above, the monolithic photocatalyst tank 30 is formed in a dimension of 1500 x 1500 x 500 mm, and inside thereof is filled with 1100 liters of photocatalyst particles coated with a photocatalyst (titanium oxide film) on the surface of the transparent silica gel. It is. The obtained measurement results are shown in Table 1.

Table 1 Dioxin Reduction Test Results in Waste Incinerator Flue Gas Run No. Measurement date Catalyst inlet temperature condition (℃) PCDDs / Fs (ngTEQ / Nm ³ ) Co-PCBs (ngTEQ / Nm ³ ) Removal rate (%) Entrance exit Entrance exit PCDDs / Fs Co-PCBs One 2/17 210 53 0.16 1.1 0.000036 99.7 100 2 2/24 190 45 0.058 1.4 0.000032 99.9 100 3 3/02 335 81 0.45 2.1 0.014 99.4 99.3 4 3/11 271 130 1.6 3.7 0.052 98.8 98.6 5 3/17 202 49 1.2 1.1 0.025 97.6 97.7

PCDDs / Fs: Polychlorodibenzoparadioxin / polychlorodibenzofuran

Co-PCBs: Coplanar-PCB

In experiments 1 to 5, the concentration of dioxins in the exhaust gas discharged from the incinerator of the irradiation facility was in the range of 45 ngTEQ / m ³ N to 130 ngTEQ / m ³ N, but when treated in this exhaust gas purification apparatus, 0.06 It was found that the range of ngTEQ / m ³ N to 1.6 ngTEQ / m ³ N was remarkably decreased, and the removal rate of dioxins was 97.6% to 99.9%. On the other hand, the coplanar-PCB concentration in the exhaust gas discharged from the incinerator of the irradiation facility was in the range of 1.1 ngTEQ / m ³ N to 3.7 ngTEQ / m ³ N, but when treated with this exhaust gas purification treatment device, it was 0.000032ngTEQ / It was remarkably reduced to the range of m ³ N to 0.052 ngTEQ / m ³ N, and the removal rate of coplanar-PCB was found to be 97.7% to 100%.

Next, although details such as actual values are not shown, the total amount of dioxins or coplanar-PCB contained in the extracted liquid extracted from the recovered photocatalyst is determined by the total amount of dioxins or coplanar-PCB in the treated exhaust gas. It was about 1 to 3%, respectively. For this reason, it was found that the dioxins or coplanar-PCBs removed in each experiment were not adsorbed to the photocatalytic particles but were so-called redox by the catalytic ability of the photocatalytic particles.

From these results, remarkable removal performance can be obtained even in the vicinity of the exhaust gas temperature of 300 ° C. where dioxins have been produced up to now, and coplanar-PCB, which has a low decomposition removal rate in conventional redox catalysts, is also obtained. In addition, it can be confirmed that the reduction can be effectively performed in the same manner as PCDDs and PCDFs.

As described above, according to the exhaust gas purification treatment apparatus described in each claim of the present application, which cannot be obtained in the conventional combustion exhaust gas purification treatment apparatus,

① It is different from a purifier using a dust collector, a bug filter, a cyclone, etc., and there is no need to quench the combustion exhaust gas discharged from the incinerator using a cooling device or to heat the cooled combustion exhaust gas again to a high temperature. In addition, it is unnecessary to control the temperature of the combustion exhaust gas, simplify the entire incinerator, provide them inexpensively, and attach it to the back of the combustion exhaust gas discharge furnace of the already installed incinerator.

(2) Unlike an apparatus for adsorbing with an adsorbent such as activated carbon or coke, secondary processing of used waste adsorbents, for example, adsorbing dioxins, coplanar-PCB, or the like, becomes unnecessary.

③ The excitation light irradiated from the light source can reliably photoexcite the photocatalyst, and the excitation action due to the heat excitation of titanium oxide is added and they act synergistically, so that the combustion exhaust gas is included in the combustion exhaust gas without temperature control, for example. It is extremely effective in that it can effectively oxidize and decompose environmental pollutants such as dioxin and coplanar-PCB, and can purify exhaust gas to the extent that it can be released into the atmosphere. Effect is obtained.

Claims (12)

A rectangular filter tank in which the connecting member is connected to the exhaust gas supply passage for continuous connection, and therein is filled with a filter material therein; An apparatus for purifying exhaust gas provided with an exhaust member which is continuously connected with or without a heat resistant member to the photocatalyst tank, The photocatalyst tank comprises a plurality of casings penetrating the inside of the photocatalyst tank in a tubular shape having ultraviolet permeability, and a light source mounted in each casing to emit excitation light of the photocatalyst particles. Processing unit. The photocatalyst extraction hole is formed in the lower end of the sidewall of the photocatalyst tank, and the bottom surface is formed in the shape of a haptic head inclined toward the lower side of the photocatalyst extraction hole or in a right angle. Exhaust gas purification treatment apparatus. 3. The apparatus for purifying exhaust gas according to claim 1 or 2, wherein a plurality of single photocatalyst tanks are connected in series with or without a heat resistant member. The exhaust gas purifying apparatus according to claim 1 or 2, wherein the exhaust gas is supplied to the photocatalyst tank without temperature control. The exhaust gas purifying apparatus according to claim 1 or 2, wherein the light source is a combination of a sterilizing lamp and a black light. The exhaust gas purifying apparatus according to claim 1 or 2, wherein the filter medium comprises any one of spherical ceramics or silica gel having an alkali treatment of 5 to 25 mm in diameter. The exhaust gas purifying apparatus according to claim 1 or 2, further comprising blowing means for blowing air toward the casing for air-cooling the light source. The purification of the exhaust gas according to claim 1, wherein the photocatalyst particles are either a porous body in which the surface of the porous metal carrier is coated with a titanium oxide coating, or a porous body in which the surface of the porous ceramic carrier is coated with a titanium oxide coating. Processing unit. The exhaust gas purifying apparatus according to claim 8, wherein the porous ceramic carrier is any one selected from the group consisting of activated carbon, activated alumina, silica gel, and porous glass. 2. The apparatus for purifying exhaust gas according to claim 1, wherein the photocatalyst particles are any one of a woven fabric, a nonwoven fabric, a knitted fabric, and various other fibrous structures having heat-resistant fibers whose surface is coated with a titanium oxide film. The said photocatalyst particle is any one type of metal in any one of Claims 8-10 whose surface of the said titanium oxide film is selected from the group which consists of platinum, rhodium, ruthenium, palladium, iron, silver, copper, and zinc. An exhaust gas purification treatment apparatus, further coated with a film. The exhaust gas purifying apparatus according to any one of claims 8 to 10, wherein the crystal form of the titanium oxide film is anatase.