JP3469142B2 - Exhaust gas treatment device and treatment method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to various incinerators such as an urban refuse incinerator, an industrial waste incinerator, a sludge incinerator, and the like.
Regarding technology for purifying exhaust gas discharged from thermal decomposition furnaces, melting furnaces, etc., especially halogenated aromatic compounds such as nitrogen oxides and dioxins contained in the exhaust gas, highly condensed aromatic hydrocarbons, and environmental hormones The present invention relates to an exhaust gas treatment device and a treatment method for making it harmless.

[0002]

BACKGROUND ART Exhaust gas discharged from various incinerators such as an urban refuse incinerator, an industrial waste incinerator, a sludge incinerator, and the like has harmful substances represented by dioxins and PCBs in addition to nitrogen oxides. Hazardous substances such as halogenated aromatic compounds, highly condensed aromatic hydrocarbons, and environmental hormones are contained, causing damage to humans and animals and plants, and destroying the natural environment, which has become a serious social problem.

Conventionally, in order to remove the harmful substances contained in the exhaust gas, there are a method of decomposing the harmful substances by using a catalyst, a method of adsorbing the harmful substances with an adsorbent and disposing of them separately. Proposed.

Among these, in the method of adsorption treatment using an adsorbent (activated carbon etc.), after the harmful substances in the exhaust gas are adsorbed by the adsorbent, the activated carbon adsorbing the harmful substances is burned at a high temperature to dioxins and the like. However, there is a problem in that the activated carbon is also burned at the same time during this combustion, and the adsorbent cannot be reused.

In the case of reusing the activated carbon that has been subjected to the adsorption treatment of dioxins, the activated carbon is moved in the adsorption tower in the direction orthogonal to the passage direction of the exhaust gas, and the activated carbon with reduced adsorption capacity is taken out of the system in order. It has been proposed to regenerate the activated carbon having adsorbed the extracted dioxins (see Japanese Patent Laid-Open No. 4-277005).

However, in the above-mentioned proposed technique, since the regeneration of the activated carbon needs to be carried out at a high temperature of 300 to 450 ° C., there is a problem that the apparatus becomes large in size. Further, in the temperature range, there is also a problem that dioxins are generated by re-synthesis of the eliminated dioxins precursor.

In view of the above problems, it is an object of the present invention to provide an exhaust gas treating apparatus and a treating method capable of treating harmful substances such as dioxins in exhaust gas with a high efficiency and a compact structure. To do.

[0008]

In order to solve the above-mentioned problems, the invention of claim 1 of the present invention is an exhaust gas for adsorbing and removing harmful substances in the exhaust gas discharged from an incinerator, a pyrolysis furnace, a melting furnace and the like. In the treatment apparatus, the first adsorbent for removing dust components in the exhaust gas is provided with a dust removal layer that is movable in a direction substantially orthogonal to the exhaust gas passage method, and a harmful substance in the exhaust gas that has passed through the dust removal layer. Exhaust gas adsorption device comprising a fixed adsorption layer filled with a second adsorbent to be adsorbed, and a sieve means for removing the dust component adhering to the first adsorbent outside the system and reusing the adsorbent At least two units are provided, and while one exhaust gas treatment device is adsorbing the harmful substances in the exhaust gas, the second adsorbent that adsorbs the harmful substances of the other exhaust gas adsorbing devices is not affected by high temperature. Introduce active gas to remove harmful substances from the second adsorbent Reproduces the adsorbent away, a heating regeneration gas containing harmful substances released the removal, characterized in that decomposed catalytically.

[0009] The invention of [claim 2] is, in claim 1, the third adsorbent which adsorbs fine powder on the downstream side of the second adsorbent.
The adsorbent is characterized by comprising a trapping layer which is movable in a direction substantially orthogonal to the exhaust gas passing method.

The invention of [claim 3] is characterized in that, in claim 1, two or more of the fixed adsorption layers are provided.

The invention of [claim 4] is characterized in that, in claim 1, the first adsorbent and the second adsorbent 14 are activated carbon.

The invention of [claim 5] is characterized in that, in claim 1, the second adsorbent is a mixture of activated carbon and an adsorbent other than activated carbon.

The invention of claim 6 is characterized in that, in claim 1, the second adsorbent has a mixing ratio of activated carbon and an adsorbent other than activated carbon of 90:10 to 50:50. .

The invention according to claim 7 is the method according to claim 1 or 2, wherein the heat treatment of the second adsorbent is 250 to 300.
It is characterized in that it is performed at ℃.

The invention according to claim 8 is an incinerator, thermal decomposition
Adsorbs harmful substances in exhaust gas discharged from furnaces, melting furnaces, etc.
Exhaust gas treatment method for removing dust in exhaust gas
The first adsorbent for removing the components is made substantially orthogonal to the exhaust gas passage method.
The dust removal layer that can move freely in the direction
A second adsorbent that adsorbs harmful substances in the exhaust gas that has passed through
Fixed adsorbent bed filled and dust adhering to the first adsorbent
The sieving means for removing the adsorbent from outside the system and reusing the adsorbent
Provide at least two exhaust gas adsorption devices
Absorbs dust components in exhaust gas with one exhaust gas adsorption device.
While wearing, it is harmful to the exhaust gas of other exhaust gas adsorption devices.
Adsorbing a substance by introducing a high temperature inert gas into the adsorbent
Desorption of harmful substances from the adhesive and regeneration of the adsorbent
It is characterized by

According to the invention of claim 9, in claim 8, the harmful substance in the exhaust gas is selected from dioxins, polyhalogenated biphenyls, halogenated benzenes, halogenated phenols and halogenated toluenes. It is characterized by being at least one halogenated aromatic compound, a highly condensed aromatic hydrocarbon, and an endocrine disrupter.

The invention of claim 10 is the same as in claim 9, wherein the dioxins are polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs) and polybrominated dibenzo-p-dioxins. (PBDDs), polybrominated dibenzofurans (PBDDs)
DFs), polyfluorinated dibenzo-p-dioxins (P
FDDs), polyfluorinated dibenzofurans (PFDF)
s), polyiodinated dibenzo-p-dioxins (PI
DDs), polyiodinated dibenzofurans (PIDFs)
Is characterized in that.

The invention of an exhaust gas treatment system according to claim 11 is an exhaust gas treatment system for purifying harmful substances in exhaust gas, comprising a dust removing device for removing soot and dust in exhaust gas, and the exhaust gas treatment according to claim 1 or 2. And a device. Moreover, you may make it provide a denitration apparatus which processes the nitrogen oxide in exhaust gas.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below, but the present invention is not limited thereto.

FIG. 1 is a schematic diagram of an exhaust gas treating apparatus using the above catalyst, FIG. 2 is a detailed view thereof, and FIG. 3 is a schematic diagram of an exhaust gas purifying system incorporating the above treating apparatus. First, as shown in FIG. 3, the exhaust gas purification system 10
Reference numeral 0 denotes a gas cooling device 102 that cools exhaust gas 11 discharged from various incinerators 101 such as an urban refuse incinerator, an industrial waste incinerator, a sludge incinerator, and a dust removing device 103 that removes soot and dust in the exhaust gas 11. , An exhaust gas treatment device 104 provided with an adsorbent for adsorbing exhaust gas containing harmful substances such as halogenated aromatic compounds, highly condensed aromatic hydrocarbons, and environmental hormones, and a chimney for discharging purified exhaust gas to the outside. 10
It is composed of 5 and. According to this exhaust gas purification system, first, the dust remover 103 can remove soot and dust from the exhaust gas, and then the harmful substances in the exhaust gas 11 that have been dust removed by the exhaust gas treatment device 104 can be removed by the adsorbing action of the adsorbent. Can be purified.

An example of the exhaust gas treating apparatus 104 according to the present embodiment is shown in FIG. As shown in FIG. 1, the exhaust gas treatment device 104 is an exhaust gas treatment device for adsorbing and removing harmful substances in exhaust gas discharged from an incinerator, a pyrolysis furnace, a melting furnace, etc., and is a dust component in the exhaust gas 11. The first adsorbent 12 for removing the dust, the dust removing layer 13 that is movable in a direction substantially orthogonal to the exhaust gas passing method, and the dust removing layer 13
Fixed adsorbent layer 15 filled with a second adsorbent 14 that adsorbs harmful substances in the exhaust gas 11 that has passed through, and a third adsorbent that is provided downstream of the second adsorbent and adsorbs fine powder 1
6 is provided with a trapping layer 17 that is movable in a direction substantially orthogonal to the exhaust gas passing method, and a sieve means 18 that removes dust components adhering to the first adsorbent outside the system and reuses the adsorbent. At least two exhaust gas adsorption devices 19 (19A, 19
B) It is provided.

In the case shown in FIG. 1, the valve B
1, B2, B5, B6 closed, valves B3, B4, B
7 and B8 are open and one exhaust gas adsorption device 19A
While adsorbing the harmful substance in the exhaust gas 11, the high temperature inert gas (for example, N ₂ gas or the like) is applied to the second adsorbent 14 which has already adsorbed the harmful substance in the other exhaust gas adsorbing device 19B. The adsorbent can be regenerated while introducing and desorbing harmful substances from the second adsorbent 14. Further, the heated regeneration exhaust gas 20 containing the desorbed harmful substances is subjected to a catalytic action in the catalytic device 21 to decompose dioxins. On the other hand, when the adsorbent becomes equal to or more than the adsorption allowable amount due to the treatment of the exhaust gas in the above state, the valves B1, B2, B5, B6 are immediately opened and the valves B3, B4, B7, B8 are closed. Thus, the adsorbent is regenerated in the one exhaust gas adsorbing device 19A and the harmful substance is adsorbed in the other exhaust gas adsorbing device 19B.

According to the above device, the exhaust gas adsorption device 19A
In the dust removal layer 1
After being removed in 3, the harmful substances in the exhaust gas 11 are adsorbed by the second adsorbent 14 which is movable in a direction substantially orthogonal to the exhaust gas passage method. In the one exhaust gas adsorbing device 19B, the N ₂ gas is heated by the heating means 22 such as a heater to heat the second adsorbent 14 that adsorbs the harmful substance, and the heated second adsorbent 14 is heated. The toxic substance can be desorbed from the material and the adsorbent can be regenerated to be reused, and the desorbed toxic material can be decomposed by the catalytic action of the catalyst device 21 filled with the dioxin catalyst. The heated N ₂ gas is circulated by the blower 23 to improve the regeneration efficiency and desorption efficiency of the adsorbent. Therefore, by operating the exhaust gas adsorbing devices 19A and 19B alternately, efficient exhaust gas treatment becomes possible. Further, even when performing maintenance work on one device, exhaust gas treatment can be performed on the other, so continuous operation is possible because the exhaust gas treatment is not stopped.

Here, the dust removing layer 13 is the exhaust gas 11 which is still present even after passing through the dust removing device 103.
The fine dust component inside is removed to prevent deterioration and clogging of the adsorbent 14 of the fixed adsorption layer 15 provided on the downstream side. The first adsorbent moving in the removal layer 13 is separated by the sieving means 18 outside the system and is reused in order to separate the dust component. The sieving means 1
In order to remove the harmful substances adhered to or contained in the dust in the dust component separated by 8, the harmful substances are separately treated by known means such as high temperature incineration.

In the present embodiment, the fixed fixed adsorption layer 15 is provided in two stages, and the harmful substances in the exhaust gas are sequentially adsorbed to improve the adsorption efficiency. Further, the adsorption efficiency may be further improved by providing a plurality of stages of three or more. When a plurality of fixed adsorption layers 15 are provided, the particle size of the adsorbent may be gradually reduced from the upstream side to the downstream side to prevent clogging.

Further, in the present embodiment, the third adsorbent 16 for adsorbing the fine powder generated when the exhaust gas passes through the second adsorbent 14 is movable in a direction substantially orthogonal to the exhaust gas passing method. The second adsorbent 1 is provided with a different trapping layer 17.
4 collects fine dust (for example, carbon dust in the case of activated carbon) generated by vibration caused by passage of exhaust gas and prevents discharge to the outside. Further, as shown in FIG. 2, the third adsorbent 16 is mixed with the first adsorbent 12 and sieved by the sieving means 18 for reuse.

Further, in the present embodiment, the dust removing layer 13, the fixed adsorption layer 15 and the trapping layer 17 are contained in the same container 22 so that exhaust gas sequentially passes therethrough. They may be connected by pipes as separate containers.

In this embodiment, the first adsorbent 1 is used.
2, activated carbon is used as the second adsorbent 14 and the third adsorbent 16. Examples of the activated carbon include coal coal, coconut charcoal, resinous charcoal, wood charcoal, and peat charcoal, but the present invention is not limited thereto.

Besides the above-mentioned activated carbon, as a porous adsorbent for adsorbing dioxins, for example, silica-based substances such as volcanic ash, silica gel, shirasu, chromosolve, zeolites, clay minerals such as mordenite, apatite, bone charcoal, phosphoric acid, etc. Phosphoric acid compounds such as ammonium magnesium granules, coral fossils, carbonic acid compounds such as calcium carbonate, alumina, crystalline silicate, silica-alumina, etc. are used, especially silica gel, crystalline silicate, ammonium magnesium phosphate granules, It is preferable to use coral fossil, zeolite and volcanic ash.

The activated carbon used for the second adsorbent 14 to be recycled may be a mixture of activated carbon and an adsorbent other than the above activated carbon. This is because in the case of activated carbon alone, as will be described later, when the temperature is increased in the step of desorbing harmful substances, the adsorbents other than the activated carbon release heat and prevent spot-like ignition.

The mixing ratio is 90:10 when the second adsorbent 14 is a mixture of activated carbon and an adsorbent other than activated carbon.
It is good to be set to 50:50. This is because when the ratio is 50:50 or more, the blending amount of activated carbon is reduced and the adsorption effect of activated carbon is reduced.

The above heat regeneration treatment of the second adsorbent is performed by using N ₂
It is performed while introducing gas, and is performed at 250 to 300 ° C. This is because heating below 250 ° C is not desirable for desorption efficiency, while above 300 ° C, the activated carbon is prone to ignition and fire, and the heating equipment is large-scale and compact. Because it will not be possible.

Here, the harmful substances in the exhaust gas to be decomposed by the catalyst of the present invention are harmful halogenated aromatic compounds represented by dioxins and PXB (X represents halogen), high condensation degree. It refers to harmful substances such as aromatic hydrocarbons, but is not limited to these as long as they are harmful substances (or environmental hormones) in exhaust gas that can be decomposed by the oxidation catalytic action of the present invention.

The aromatic halogen compounds to be decomposed in the present invention are not limited to these as long as they are harmful substances represented by dioxins and PCBs (eg, environmental hormones). Here, the dioxins are polyhalogenated dibenzo-p-dioxins (P
XDDs) and polyhalogenated dibenzofurans (PX
DFs) is a general term (X represents halogen), and it is said that a small amount is generated when a halogen-based compound and a certain organic halogen compound are burned. Depending on the number of halogens, there are monohalides to octahalides, of which dibenzo-p-dioxin tetrachloride (T ₄ CDD)
Is known to have the highest toxicity. As the harmful halogenated aromatic compound, in addition to dioxins, various organic halogen compounds as precursors thereof (for example, aromatic compounds such as phenol and benzene (for example, halogenated benzenes, halogenated phenols and halogens) are used. Toluene, etc.), alkyl halide compounds, etc.) are included and must be removed. That is, dioxins represent not only chlorinated dioxins but also halogenated dioxins such as brominated dioxins. In addition, PXBs (polyhalogenated biphenyls) is a general term for compounds in which several halogen atoms are added to biphenyl. There are isomers depending on the number of halogen substitutions and the substitution position, but in the case of PCB (polychlorinated biphenyls) , 2,6-dichlorobiphenyl, 2,2'-dichlorobiphenyl, 2,3,5-trichlorobiphenyl, etc. are typical, and are highly toxic and may cause dioxins when incinerated. Known as a thing and needs to be removed. Needless to say, the PXBs also include the coplanar PXB.

The high-condensation aromatic hydrocarbon is a general term for polynuclear aromatic compounds, may contain one or more OH groups, is recognized as a carcinogen, and needs to be removed from the exhaust gas. .

Further, in many manufacturing processes, in addition to soot dust, an exhaust gas containing a gaseous organic compound such as formaldehyde, benzene or phenol may be generated. These organic compounds are also environmental pollutants and significantly impair human health, and thus need to be removed from exhaust gas.

The nitrogen oxides to be treated in the present invention usually mean NO and NO ₂ as well as mixtures thereof.
Also called NOx. However, in addition to these, the NOx often contains unstable nitrogen oxides of various oxidation numbers. Therefore, x is not particularly limited, but is usually a value of 1-2. It is said that it becomes nitric acid, nitrous acid, etc. in rainwater, etc., or NO is one of the main causative substances of photochemical smog, and is a compound harmful to the human body.

According to the present invention, while the harmful substances are first adsorbed by the adsorbent of the one exhaust gas adsorbing device 19A, the N ₂ from the heating regeneration means 22 is adsorbed in the other exhaust gas adsorbing device 19B.
Hazardous substances are separated from the second adsorbent 14 by the supply of gas, and then by the catalytic action of the catalyst device 21, harmful substances such as halogenated aromatic compounds and highly condensed aromatic hydrocarbons, which are the above-mentioned harmful substances, The gaseous organic compound can be catalytically decomposed to be rendered harmless. As described above, according to the present invention, the harmful substances in the exhaust gas are not directly decomposed but are first adsorbed by the adsorbent to purify the exhaust gas components, and the adsorbed harmful substances are separately desorbed in the heated regeneration exhaust gas 20. Since the harmful substances contained in are removed by decomposition, the catalytic performance can be efficiently exhibited without being affected by the heavy metals present in the exhaust gas. That is, heavy metals are attached to fine dust components in the exhaust gas from the dust remover, and the heavy metals and chlorine and precursors of dioxins react synergistically to re-synthesize dioxins. Like the invention, it first adsorbs harmful substances and then
Since the harmful substances can be desorbed separately and only the harmful substances such as dioxins can be decomposed by the catalyst device, the decomposition efficiency is improved. Here, as the dioxin decomposition catalyst, a known dioxin decomposition catalyst may be used.

Here, as the dioxins decomposition catalyst, for example, titanium (Ti), silicon (Si), aluminum (Al), Zr (zirconium), P (phosphorus),
For example, vanadium (V), tungsten (W), molybdenum (Mo), niobium (Nb) is added to a carrier composed of at least one selected from B (boron) or a carrier composed of a composite oxide containing two or more of these elements. Alternatively, a catalyst such as a tantalum (Ta) oxide carrying an active component composed of at least one kind of oxide or a known dioxin decomposition catalyst can be used, and the catalyst is not particularly limited.

Due to the catalytic action of the dioxins decomposition catalyst, halogenated aromatic compounds in the exhaust gas of the above harmful substances, precursors of halogenated aromatic compounds, halogenated aromatic compounds such as PXB, and highly condensed aromatic compounds. It can decompose hydrocarbons and environmental hormones.

Further, as the dioxins decomposition catalyst, for example, the detoxification treatment can be more effectively carried out by the oxidative decomposition of the oxidation catalyst having a pyridine adsorption acid amount of 0.30 mmol / g or more.

FIG. 4 shows another example of the outline of the exhaust gas treatment system using the above-mentioned adsorbent, but the treatment system using the exhaust gas treatment apparatus of the present invention is not limited to this.

As shown in FIG. 4, as another treatment system, in the system shown in FIG.
A denitration device 106 is separately provided on the downstream side of 03, and after removing harmful substances such as dioxins by the exhaust gas treatment device 103, nitrogen oxides and the like are decomposed and removed.

[0044]

As described above, according to the invention of [Claim 1] of the present invention, the exhaust gas treatment for adsorbing and removing the harmful substances in the exhaust gas discharged from the incinerator, the pyrolysis furnace, the melting furnace, etc. First device for removing dust components in exhaust gas
Of the adsorbent, which is movable in a direction substantially orthogonal to the exhaust gas passage method, and a fixed adsorption layer filled with a second adsorbent for adsorbing harmful substances in the exhaust gas that has passed through the dust removal layer, Since at least two exhaust gas adsorbing devices equipped with a sieve means for removing the dust component adhering to the first adsorbent outside the system and reusing the adsorbent are provided, one exhaust gas treating device can be used. Second, while adsorbing the harmful substances in the exhaust gas, adsorbing the harmful substances of another exhaust gas adsorbing device
High-temperature inert gas is introduced into the adsorbent to desorb the harmful substances from the second adsorbent to regenerate the adsorbent, and at the same time, the heated regeneration exhaust gas containing the desorbed harmful substances is decomposed by catalytic action. Can be processed.

According to the invention of [Claim 2], in Claim 1, a third adsorbent for adsorbing fine powder is provided on the downstream side of the second adsorbent in a direction substantially orthogonal to the exhaust gas passage method. Since the movable trapping layer is provided, the fine dust of the second adsorbent is trapped to form a further purified exhaust gas.

According to the invention of [Claim 3], in Claim 1, since two or more of the fixed adsorption layers are provided, the adsorption efficiency is improved.

According to the invention of [Claim 4], in Claim 1, since the first adsorbent and the second adsorbent 14 are activated carbon, the adsorption efficiency of harmful substances in the exhaust gas is improved. .

[0048] According to the invention of [Claim 5], in Claim 1, since the second adsorbent is a mixture of activated carbon and an adsorbent other than activated carbon, the adsorbent other than activated carbon releases heat. It is possible to prevent spot-like ignition.

According to the invention of [Claim 6], the mixing ratio of activated carbon to the adsorbent other than activated carbon in the second adsorbent is 90:10 to 50:50.
Adsorbents other than the above-mentioned activated carbon can release heat and prevent spot-like ignition.

According to the invention of [Claim 7], the heat treatment of the second adsorbent according to Claim 1 or 2 is 250 to
Since it is performed at 300 ° C., desorption of harmful substances is efficiently performed.

According to the invention of [Claim 8], there is provided an exhaust gas treatment method for adsorbing and removing harmful substances in exhaust gas discharged from an incinerator, a pyrolysis furnace, a melting furnace, etc., wherein dust components in the exhaust gas are removed. A fixed type in which a first adsorbent to be removed is movable in a direction substantially orthogonal to the exhaust gas passage method, and a second adsorbent that adsorbs harmful substances in the exhaust gas that has passed through the dust removal layer is filled. At least two exhaust gas adsorbing devices provided with an adsorption layer and a sieve means for removing dust components adhering to the first adsorbent outside the system and reusing the adsorbent are provided, and one exhaust gas is provided. While adsorbing the dust components in the exhaust gas with the adsorption device, introduce a high temperature inert gas into the adsorbent that has adsorbed the harmful substances in the exhaust gas from another exhaust gas adsorption device to desorb the harmful substances from the adsorbent. As well as regenerate the adsorbent, adsorption The adsorption process harmful substances adsorbed separately can be decomposed by the catalytic action becomes effective.

According to the invention of [Claim 9], the harmful substance in the exhaust gas is at least one selected from dioxins, polyhalogenated biphenyls, halogenated benzenes, halogenated phenols and halogenated toluenes. It can decompose halogenated aromatic compounds as well as highly condensed aromatic hydrocarbons and environmental hormones.

According to the invention of [Claim 10], the dioxins are polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDF).
s), polybrominated dibenzo-p-dioxins (PBD
Ds), polybrominated dibenzofurans (PBDFs), polyfluorinated dibenzo-p-dioxins (PFDDs),
Polyfluorinated dibenzofurans (PFDFs), polyiodinated dibenzo-p-dioxins (PIDDs), and polyiodinated dibenzofurans (PIDFs) can be decomposed.

An invention of an exhaust gas treatment system according to [claim 11] is an exhaust gas treatment system for purifying harmful substances in exhaust gas, comprising a dust removing device for removing soot and dust in exhaust gas, and the exhaust gas treatment according to claim 1 or 2. Since it is composed of a device, it is possible to first remove soot and dust in the exhaust gas with a dust remover and remove harmful substances in the exhaust gas by the adsorbing action of the adsorbent, thereby purifying the exhaust gas.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an exhaust gas treatment apparatus according to the present embodiment.

FIG. 2 is a schematic view of a main part of an exhaust gas adsorption device according to the present embodiment.

FIG. 3 is a schematic diagram of an exhaust gas treatment system according to the present embodiment.

FIG. 4 is a schematic view showing an example of another exhaust gas treatment system.

[Explanation of symbols]

11 exhaust gas 12 First adsorbent 13 Dust removal layer 14 Second adsorbent 15 Fixed adsorption layer 16 Third adsorbent 17 Collection layer 18 sieving means 19A, 19B Exhaust gas adsorption device 20 Heating regeneration exhaust gas 21 Catalytic device 22 containers 23 Blower B1 to B8 valves 100 Exhaust gas purification system 101 incinerator 102 gas cooling device 103 dust remover 104 Exhaust gas treatment equipment 105 chimney 106 Denitration equipment

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Doroguchi 5 34-6 Shiba, Minato-ku, Tokyo Mitsubishi Heavy Industries Environmental Engineering Co., Ltd. (56) Reference JP-A-8-332343 (JP, A) JP Hei 5-261243 (JP, A) JP-A-11-179140 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B01D 53/04 B01D 53/34

Claims (12)

(57) [Claims] 1. An exhaust gas treatment device for adsorbing and removing harmful substances in exhaust gas discharged from an incinerator, a pyrolysis furnace, a melting furnace, etc., wherein the first adsorbent for removing dust components in the exhaust gas is exhaust gas. A dust removal layer that is movable in a direction substantially orthogonal to the passing method, a fixed adsorption layer filled with a second adsorbent that adsorbs harmful substances in the exhaust gas that has passed through the dust removal layer, and a first adsorbent At least two exhaust gas adsorbing devices equipped with a sieving means for removing dust components adhering to the outside of the system and reusing the adsorbent are provided, and one exhaust gas adsorbing device can remove harmful substances in exhaust gas. While adsorbing, a high temperature inert gas is introduced into the second adsorbent which has adsorbed the harmful substance of another exhaust gas adsorption device, and the harmful substance is desorbed from the second adsorbent to remove the adsorbent. And contains the desorbed harmful substances. Exhaust gas treatment apparatus, wherein a thermal regeneration gas decomposing catalytically. 2. The trapping layer according to claim 1, further comprising a third adsorbent for adsorbing fine powder, the trapping layer being movable in a direction substantially orthogonal to the exhaust gas passage method on the downstream side of the second adsorbent. An exhaust gas treatment device characterized by the following. 3. The exhaust gas treating apparatus according to claim 1, comprising two or more fixed adsorption layers. 4. The exhaust gas treating apparatus according to claim 1, wherein the first adsorbent and the second adsorbent are activated carbon. 5. The exhaust gas treating apparatus according to claim 1, wherein the second adsorbent is a mixture of activated carbon and an adsorbent other than activated carbon. 6. The exhaust gas treating apparatus according to claim 1, wherein the second adsorbent has a mixing ratio of activated carbon and an adsorbent other than activated carbon of 90:10 to 50:50. 7. The exhaust gas treating apparatus according to claim 1 or 2, wherein the heat treatment of the second adsorbent is performed at 250 to 300 ° C. 8. An exhaust gas treatment method for adsorbing and removing harmful substances in exhaust gas discharged from an incinerator, a pyrolysis furnace, a melting furnace, etc., wherein the first adsorbent for removing dust components in the exhaust gas is exhaust gas. A dust removal layer that is movable in a direction substantially orthogonal to the passing method, a fixed adsorption layer filled with a second adsorbent that adsorbs harmful substances in the exhaust gas that has passed through the dust removal layer, and a first adsorbent At least two exhaust gas adsorbing devices equipped with a sieving means for removing the dust component adhering to the outside of the system and reusing the adsorbent are provided, and the dust component in the exhaust gas is removed by one exhaust gas adsorbing device. While adsorbing, it is possible to introduce a high temperature inert gas into the adsorbent that has adsorbed the harmful substances in the exhaust gas of other exhaust gas adsorbing devices to desorb the harmful substances from the adsorbent and regenerate the adsorbent. A characteristic exhaust gas treatment method. 9. The toxic substance in the exhaust gas according to claim 8, wherein the toxic substance is at least one halogenated aromatic selected from dioxins, polyhalogenated biphenyls, halogenated benzenes, halogenated phenols and halogenated toluenes. A method for treating exhaust gas, which comprises a compound, a highly condensed aromatic hydrocarbon, and an endocrine disrupter. 10. The dioxin according to claim 9, wherein the dioxins are polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polybrominated dibenzo-p-dioxins (PBDDs), polyodors. Dibenzofurans (PBD
Fs), polyfluorinated dibenzo-p-dioxins (PF
DDs), polyfluorinated dibenzofurans (PFDFs),
Polyiodinated dibenzo-p-dioxins (PIDD
s), a polyiodinated dibenzofurans (PIDFs), an exhaust gas treatment method. 11. An exhaust gas treatment system for purifying harmful substances in exhaust gas, comprising a dust remover for removing soot dust in the exhaust gas, and claim 1.
An exhaust gas treatment system, comprising: 12. The exhaust gas treatment system according to claim 11, further comprising a denitration device for treating nitrogen oxides in the exhaust gas.