JP2021041319A - Treatment method and device of combustion exhaust gas - Google Patents

Treatment method and device of combustion exhaust gas Download PDF

Info

Publication number
JP2021041319A
JP2021041319A JP2019163912A JP2019163912A JP2021041319A JP 2021041319 A JP2021041319 A JP 2021041319A JP 2019163912 A JP2019163912 A JP 2019163912A JP 2019163912 A JP2019163912 A JP 2019163912A JP 2021041319 A JP2021041319 A JP 2021041319A
Authority
JP
Japan
Prior art keywords
exhaust gas
dioxins
combustion exhaust
activated carbon
adsorbent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2019163912A
Other languages
Japanese (ja)
Other versions
JP7202271B2 (en
Inventor
哲也 吉柳
Tetsuya Yoshiyanagi
哲也 吉柳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KAWASAKI GIKEN CO Ltd
Original Assignee
KAWASAKI GIKEN CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by KAWASAKI GIKEN CO Ltd filed Critical KAWASAKI GIKEN CO Ltd
Priority to JP2019163912A priority Critical patent/JP7202271B2/en
Publication of JP2021041319A publication Critical patent/JP2021041319A/en
Application granted granted Critical
Publication of JP7202271B2 publication Critical patent/JP7202271B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Treating Waste Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

To provide a treatment method and a device of combustion exhaust gas which reduce a percentage content of dioxins in a collected fly ash, and surely decompose dioxins in exhaust gas by a subsequent dioxin decomposition device.SOLUTION: A treatment method of combustion exhaust gas includes a collecting step of collecting mercury in exhaust gas and dust using an adsorbent that hardly adsorbs dioxins, and a decomposition step of decomposing the dioxins in the exhaust gas having passed through the collecting step, in which in the collection step, activated carbon having a pore of 2 nm or smaller is used.SELECTED DRAWING: Figure 1

Description

本発明は燃焼排ガスの処理方法及び装置に関し、特に、ダイオキシン類を吸着しにくい活性炭を使用することによって、回収した飛灰中のダイオキシン類の含有率を低減すると共に、後続のダイオキシン類分解装置によって排ガス中のダイオキシン類を確実に分解する燃焼排ガスの処理方法及び装置に関する。 The present invention relates to a method and an apparatus for treating combustion exhaust gas, and in particular, by using activated charcoal that does not easily adsorb dioxins, the content of dioxins in the recovered fly ash is reduced, and a subsequent dioxin decomposition apparatus is used. The present invention relates to a method and an apparatus for treating combustion exhaust gas that reliably decomposes dioxins in exhaust gas.

一般的に、廃棄物焼却処理施設では焼却処理後の排ガスは、灰分や塩素、硫黄等に由来するダスト、水銀、ダイオキシン類等の有害物質が含まれており、これらダストや有害物質は、集塵装置あるいは分解装置で除去された後に大気に排出される。
この集塵装置や分解装置では、アルカリ剤や酸性ガスを反応させて無害化処理を行い、あるいは、活性炭を集塵装置に吹き込む処理等により、ダイオキシン類の除去を行っている。
また、この集塵装置で捕集された飛灰は、水銀やダイオキシン類等の有害物質を多く含むため、溶融固化、セメント固化、薬剤処理、酸またはその他の溶媒による方法等の溶出を防止する処理が行われている。
このような廃棄物焼却処理施設における排ガス処理に関する技術として特許文献１、２の技術が知られている。 Generally, in waste incineration facilities, the exhaust gas after incineration contains harmful substances such as dust, mercury, and dioxins derived from ash, chlorine, sulfur, etc., and these dusts and harmful substances are collected. It is discharged to the atmosphere after being removed by a dust device or a decomposition device.
In this dust collector or decomposition device, dioxins are removed by reacting an alkaline agent or an acid gas to perform detoxification treatment, or by blowing activated carbon into the dust collector.
In addition, since the fly ash collected by this dust collector contains a large amount of harmful substances such as mercury and dioxins, it prevents elution by melt solidification, cement solidification, chemical treatment, acid or other solvent methods, etc. Processing is being performed.
The techniques of Patent Documents 1 and 2 are known as techniques related to exhaust gas treatment in such a waste incineration facility.

特開２０１４−２１３３０４号公報Japanese Unexamined Patent Publication No. 2014-213304 特開２０１３−１０７０２３号公報Japanese Unexamined Patent Publication No. 2013-107023

しかしながら、前記特許文献１、２の技術では、集塵装置で捕集された飛灰にはダイオキシン類が多く含まれており、ダイオキシン類の含有率ついては基準値が定められていることもあり、この基準値を超えた場合の処理が問題となっている。
本発明は係る従来の問題点を解決するためになされたものであって、その目的とするところは、ダイオキシン類を吸着しにくい活性炭を使用することによって、回収した飛灰中のダイオキシン類の含有率を低減すると共に、後続のダイオキシン類分解装置によって排ガス中のダイオキシン類を確実に分解する燃焼排ガスの処理方法及び装置を提供することにある。 However, in the techniques of Patent Documents 1 and 2, the fly ash collected by the dust collector contains a large amount of dioxins, and a standard value may be set for the content of dioxins. The processing when this standard value is exceeded has become a problem.
The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to contain dioxins in the fly ash recovered by using activated carbon that does not easily adsorb dioxins. It is an object of the present invention to provide a method and an apparatus for treating combustion exhaust gas, which reduces the rate and reliably decomposes dioxins in the exhaust gas by a subsequent dioxin decomposition apparatus.

前記目的を達成するための手段として請求項１記載の燃焼排ガスの処理方法では、ダイオキシン類が吸着されにくい吸着剤を使用して排ガス中の水銀を主とするダストを捕集する捕集工程と、前記捕集工程を通過した排ガス中のダイオキシン類を分解させる分解工程とを有することを特徴とする。 The method for treating combustion exhaust gas according to claim 1 as a means for achieving the above object includes a collection step of collecting dust mainly composed of mercury in the exhaust gas by using an adsorbent that does not easily adsorb dioxins. It is characterized by having a decomposition step of decomposing dioxins in the exhaust gas that has passed the collection step.

請求項２記載の燃焼排ガスの処理方法では、請求項１記載の燃焼排ガスの処理方法において、前記捕集工程において、２ｎｍ以下の細孔を有する活性炭を使用することを特徴とする。 The method for treating combustion exhaust gas according to claim 2 is characterized in that activated carbon having pores of 2 nm or less is used in the collection step in the method for treating combustion exhaust gas according to claim 1.

請求項３記載の燃焼排ガスの処理方法では、請求項１記載の燃焼排ガスの処理方法において、前記捕集工程において、２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用することを特徴とする。 In the method for treating combustion exhaust gas according to claim 3, in the method for treating combustion exhaust gas according to claim 1, in the collection step, the pore volume of 2 nm or less is one-third or more of the total pores. It is characterized by using the activated carbon contained in.

請求項４記載の燃焼排ガスの処理方法では、請求項１記載の燃焼排ガスの処理方法において、吸着剤としてゼオライトを使用することを特徴とする。 The method for treating combustion exhaust gas according to claim 4 is characterized in that zeolite is used as an adsorbent in the method for treating combustion exhaust gas according to claim 1.

請求項５記載の燃焼排ガスの処理方法では、請求項１、２、３または４記載の燃焼排ガスの処理方法において、分解工程において、排ガスの再加熱を行いダイオキシン類を分解することを特徴とする。 The method for treating combustion exhaust gas according to claim 5 is characterized in that, in the method for treating combustion exhaust gas according to claim 1, 2, 3 or 4, the exhaust gas is reheated to decompose dioxins in the decomposition step. ..

請求項６記載の燃焼排ガスの処理装置では、請求項１、２、３、４または５記載の処理方法に使用する装置であって、吸着剤を使用したろ過式集塵機と、捕集工程後の排ガスを加熱する加熱装置と、ダイオキシン類を分解するダイオキシン類分解装置を備えたことを特徴とする。 The combustion exhaust gas treatment device according to claim 6, which is the device used for the treatment method according to claim 1, 2, 3, 4 or 5, is a filtration type dust collector using an adsorbent and after the collection step. It is characterized by being provided with a heating device for heating exhaust gas and a dioxin decomposition device for decomposing dioxins.

請求項１記載の燃焼排ガスの処理方法では、ダイオキシン類が吸着されにくい吸着剤を使用して排ガス中の水銀を主とするダストを捕集する捕集工程と、前記捕集工程を通過した排ガス中のダイオキシン類を分解させる分解工程とを有するので、捕集工程で回収される飛灰中のダイオキシン類の含有率が低減される。
そのため、回収された飛灰のダイオキシン類の濃度は所定の基準値に抑えられ、その処理に際して環境負荷が低減される。 In the method for treating combustion exhaust gas according to claim 1, a collection step of collecting dust mainly composed of mercury in the exhaust gas using an adsorbent that does not easily adsorb dioxins, and an exhaust gas that has passed the collection step. Since it has a decomposition step of decomposing the dioxins in it, the content of dioxins in the fly ash recovered in the collection step is reduced.
Therefore, the concentration of dioxins in the recovered fly ash is suppressed to a predetermined reference value, and the environmental load is reduced during the treatment.

請求項２記載の燃焼排ガスの処理方法では、捕集工程において、２ｎｍ以下の細孔を有する活性炭を使用するので、分子サイズが大きなダイオキシン類は活性炭に吸着されないまたは吸着されにくい。そのため回収された飛灰中のダイオキシン類の含有率は低減される。 In the method for treating combustion exhaust gas according to claim 2, since activated carbon having pores of 2 nm or less is used in the collection step, dioxins having a large molecular size are not adsorbed or hardly adsorbed on the activated carbon. Therefore, the content of dioxins in the recovered fly ash is reduced.

請求項３記載の燃焼排ガスの処理方法では、捕集工程において、２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用するので、メソ孔やマクロ孔が多少混在する活性炭を使用する場合であっても、回収された飛灰中のダイオキシン類の低減効果は実現される。 In the method for treating combustion exhaust gas according to claim 3, activated carbon containing a pore volume of 2 nm or less at a ratio of 1/3 or more with respect to the entire pores is used in the collection step, so that mesopores and macros are used. Even when activated carbon with some pores is used, the effect of reducing dioxins in the recovered fly ash is realized.

請求項４記載の燃焼排ガスの処理方法では、吸着剤としてゼオライトを使用するので、０.２〜１.０ｎｍで分子径に相当するミクロ孔を持った多孔体であるという構造上、分子サイズの大きなダイオキシン類は吸着されず、ろ過式集塵機で捕集された飛灰中のダイオキシン類の含有率は低く抑えられる。 In the method for treating flue gas according to claim 4, since zeolite is used as an adsorbent, it is a porous body having micropores corresponding to the molecular diameter at 0.2 to 1.0 nm, and therefore has a molecular size. Large dioxins are not adsorbed, and the content of dioxins in the fly ash collected by the filtration type dust collector is suppressed to a low level.

請求項５記載の燃焼排ガスの処理方法では、分解工程において、排ガスの再加熱を行いダイオキシン類を分解するので、ろ過式集塵機で活性炭の吸着に適した温度に減温した排ガスを、ダイオキシン類の分解に適した温度に戻し、後続のダイオキシン類分解装置で確実に分解することができる。 In the method for treating combustion exhaust gas according to claim 5, in the decomposition step, the exhaust gas is reheated to decompose dioxins. Therefore, the exhaust gas whose temperature has been reduced to a temperature suitable for adsorbing activated carbon by a filtration dust collector is used as a dioxin. It can be returned to a temperature suitable for decomposition and can be reliably decomposed by a subsequent dioxin decomposition device.

請求項６記載の燃焼排ガスの処理装置では、吸着剤を使用したろ過式集塵機と、捕集工程後の排ガスを加熱する加熱装置と、ダイオキシン類を分解するダイオキシン類分解装置を備えたので、飛灰中のダイオキシン類の含有率を低く抑えられると共に、排ガス中のダイオキシン類を確実に分解することができる。 The combustion exhaust gas treatment device according to claim 6 is provided with a filtration type dust collector using an adsorbent, a heating device for heating the exhaust gas after the collection process, and a dioxin decomposition device for decomposing dioxins. The content of dioxins in the ash can be kept low, and the dioxins in the exhaust gas can be reliably decomposed.

本実施例に係る燃焼排ガス処理装置の概略構成を示すブロック図である。It is a block diagram which shows the schematic structure of the combustion exhaust gas treatment apparatus which concerns on this Example. 活性炭の積算細孔容積分布を表すグラフである。It is a graph which shows the integrated pore volume distribution of activated carbon. 廃棄物処理施設の説明図である。It is explanatory drawing of a waste treatment facility.

本実施例の燃焼排ガスの処理装置は、図３に示すように、ストーカ炉を備えた廃棄物処理施設に組み込まれて稼働する。
ストーカ炉１は、ごみピット２に貯留したごみをごみホッパ３に投入し、燃焼装置下部より空気を供給して、火格子４（ストーカ）上で乾燥・加熱し、攪拌・移動させ、燃焼させる構成となっている。 As shown in FIG. 3, the combustion exhaust gas treatment device of this embodiment is incorporated into a waste treatment facility equipped with a stoker furnace and operates.
The stoker furnace 1 puts the garbage stored in the garbage pit 2 into the garbage hopper 3, supplies air from the lower part of the combustion device, dries and heats it on the grate 4 (stalker), stirs, moves it, and burns it. It is composed.

前記ストーカ炉１で燃焼に伴って生じた燃焼排ガスは、ボイラ５、減温装置６を通過し、活性炭貯留サイロ７から活性炭を導入してろ過式集塵機８で処理され、誘引通風機９によって再加熱器１０に送られ、ダイオキシン類分解装置１１（触媒反応塔）を経たのち、最終的に清浄ガスとして煙突１２から外気へ放出される。 The flue gas generated by combustion in the stoker furnace 1 passes through the boiler 5 and the temperature reducing device 6, the activated carbon is introduced from the activated carbon storage silo 7, is treated by the filtration type dust collector 8, and is re-treated by the attracting ventilator 9. It is sent to the heater 10, passes through the dioxin decomposition apparatus 11 (catalytic reaction tower), and is finally discharged from the chimney 12 to the outside air as a clean gas.

図１に示すように、本実施例に係る燃焼排ガスの処理装置は、活性炭を利用したろ過式集塵機８と、ろ過式集塵機を経過した排ガスの再加熱を行う再加熱器１０と、再加熱後にダイオキシン類の分解を行うダイオキシン類分解装置１１を備えている。
廃棄物を燃焼させた後の排ガスは２００℃以下に減温されてろ過式集塵機に導入される。
ろ過式集塵機ではバグフィルターが設けられており、このバグフィルター内に排ガスと共に活性炭が導入される。
バグフィルター内では排ガスと活性炭が接触し、活性炭の細孔に水銀及び有害物質並びにダストが吸着される。
これらろ過式集塵機による捕集工程において水銀及び有害物質並びにダストを吸着した活性炭は飛灰として回収される。 As shown in FIG. 1, the combustion exhaust gas treatment apparatus according to the present embodiment includes a filtration type dust collector 8 using activated carbon, a reheater 10 for reheating the exhaust gas that has passed through the filtration type dust collector, and after reheating. The dioxin decomposition apparatus 11 for decomposing dioxin is provided.
The exhaust gas after burning the waste is cooled to 200 ° C. or lower and introduced into the filtration type dust collector.
A bag filter is provided in the filter type dust collector, and activated carbon is introduced into the bag filter together with the exhaust gas.
In the bag filter, the exhaust gas and activated carbon come into contact with each other, and mercury, harmful substances, and dust are adsorbed in the pores of the activated carbon.
In the collection process by these filtration type dust collectors, mercury, harmful substances, and activated carbon adsorbed with dust are recovered as fly ash.

ここで、活性炭は微細孔を有しており、活性炭が有する微細孔はその大きさにより次の分類がなされている。

Figure 2021041319
また、ダイオキシン類とは、ポリ塩化ジベンゾパラジオキシン（PCDD）、ポリ塩化ジベンゾフラン（PCDF）、ダイオキシン様ポリ塩化ビフェニル（DL-PCB）の総称であり、これらは塩素で置換された２つのベンゼン環という共通の構造を持っている。そして、このダイオキシン類は分子サイズが大きいため、活性炭のミクロ孔には吸着されにくい性質を有している。 Here, the activated carbon has fine pores, and the fine pores of the activated carbon are classified as follows according to their sizes.
Figure 2021041319
Dioxins are a general term for polychlorinated dibenzoparadioxin (PCDD), polychlorinated dibenzofuran (PCDF), and dioxin-like polychlorinated biphenyls (DL-PCB), which are referred to as two chlorine-substituted benzene rings. It has a common structure. Since these dioxins have a large molecular size, they have a property of being difficult to be adsorbed on the micropores of activated carbon.

本実施例ではろ過式集塵機によるダスト等の捕集工程では、直径２ｎｍ（ナノメートル）以下の細孔を有する活性炭のみを使用し、分子サイズの大きなダイオキシン類は活性炭に吸着されない方法としている。
このように直径２ｎｍ以下の細孔を有する活性炭を使用するので、ダイオキシン類は吸着されず、ろ過式集塵機で捕集された飛灰中のダイオキシン類の含有率は低く抑えられる。 In this embodiment, in the dust collecting step by the filtration type dust collector, only activated carbon having pores having a diameter of 2 nm (nanometers) or less is used, and dioxins having a large molecular size are not adsorbed by the activated carbon.
Since activated carbon having pores having a diameter of 2 nm or less is used in this way, dioxins are not adsorbed, and the content of dioxins in the fly ash collected by the filtration type dust collector can be suppressed to a low level.

ろ過式集塵機を通過した排ガスは、再加熱器によってダイオキシン類の分解に適した１８０℃以上に加熱されてダイオキシン類分解装置に導入される。
再加熱は廃棄物焼却に伴って生成する蒸気等の熱源による。
ダイオキシン類分解装置では、排ガスはハニカム状の処理槽に導入され、この処理槽を数ｍにわたり通過する間に触媒との接触によりダイオキシン類が分解される。
ダイオキシン類が分解された排ガスは清浄ガスとして煙突を介して大気に排出される。
本実施例では、ろ過式集塵機においてダイオキシン類は捕集されないので、飛灰中のダイオキシン類の含有率は低く、自治体等の定める基準値を超えることなく回収処理される。 The exhaust gas that has passed through the filtration type dust collector is heated to 180 ° C. or higher suitable for decomposing dioxins by a reheater and introduced into the dioxins decomposing device.
Reheating depends on a heat source such as steam generated by incineration of waste.
In the dioxin decomposition apparatus, the exhaust gas is introduced into a honeycomb-shaped treatment tank, and the dioxins are decomposed by contact with the catalyst while passing through the treatment tank for several meters.
Exhaust gas from which dioxins are decomposed is discharged to the atmosphere as clean gas through a chimney.
In this embodiment, since dioxins are not collected by the filtration type dust collector, the content of dioxins in the fly ash is low, and the dioxins are collected without exceeding the standard value set by the local government or the like.

次に、第２実施例に係る燃焼排ガスの処理方法を説明する。
前記実施例では直径２ｎｍ以下の細孔を有する活性炭のみを使用する方法としたが、本実施例では、メソ孔やマクロ孔が多少混在する活性炭を使用する方法である。
本実施例では直径２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用する。
ろ過式集塵機による捕集工程において水銀及び有害物質並びにダストを吸着した活性炭は飛灰として回収される。
直径２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用する場合であっても、ろ過式集塵機で捕集された飛灰中のダイオキシン類の含有率の低減効果は実現される。
なお、図２は本実施例で一例として使用される活性炭の積算細孔容積分布を表したグラフである。このグラフでは、横軸に細孔直径、縦軸に積算細孔容積を設定している。 Next, a method for treating the combustion exhaust gas according to the second embodiment will be described.
In the above embodiment, only activated carbon having pores having a diameter of 2 nm or less is used, but in this example, activated carbon in which mesopores and macropores are slightly mixed is used.
In this example, activated carbon having a pore volume of 2 nm or less in diameter at a ratio of 1/3 or more with respect to the entire pores is used.
In the collection process using a filter-type dust collector, mercury, harmful substances, and activated carbon that has adsorbed dust are recovered as fly ash.
Even when activated carbon containing a pore volume of 2 nm or less in a proportion of 1/3 or more of the total pores is used, the content of dioxins in the fly ash collected by the filtration type dust collector is contained. The effect of reducing the rate is realized.
Note that FIG. 2 is a graph showing the cumulative pore volume distribution of activated carbon used as an example in this example. In this graph, the horizontal axis is the pore diameter and the vertical axis is the integrated pore volume.

次に、第３実施例に係る燃焼排ガスの処理方法を説明する。
第３実施例の燃焼排ガスの処理方法は、前記実施例で説明した吸着剤（活性炭）としてゼオライトを使用する方法である。
ゼオライトはその構造固有の細孔を有しており、通常０.２〜１.０ｎｍで分子径に相当するミクロ孔を持った多孔体である。
このゼオライトを使用することにより、分子サイズの大きなダイオキシン類は吸着されず、ろ過式集塵機で捕集された飛灰中のダイオキシン類の含有率は低く抑えられる。
その他の構成、方法については前記実施例と同様である。 Next, a method for treating the combustion exhaust gas according to the third embodiment will be described.
The method for treating the combustion exhaust gas of the third embodiment is a method of using zeolite as the adsorbent (activated carbon) described in the above-described embodiment.
Zeolite has pores peculiar to its structure, and is usually a porous body having micropores corresponding to the molecular diameter at 0.2 to 1.0 nm.
By using this zeolite, dioxins having a large molecular size are not adsorbed, and the content of dioxins in the fly ash collected by the filtration type dust collector can be suppressed to a low level.
Other configurations and methods are the same as those in the above embodiment.

以上、本発明の実施例を説明したが、本発明の具体的な構成はこの実施例に限定されるものではなく、発明の要旨を逸脱しない範囲における設定変更等があっても本発明に含まれる。
例えば、直径２ｎｍ以下の細孔容積が細孔全体に対して４０％以上、あるいは過半数の割合で含まれる活性炭を使用する場合であっても本発明に含まれる。
また、前記実施例で説明した再加熱器、ダイオキシン類分解装置については、これに限らず、公知技術を採用する場合であっても本発明に含まれる。
また、前記実施例で説明した排ガス温度は適宜設定することが可能であり、減温塔で１６５℃に減温した排ガスを、さらに１５５℃に減温してろ過式集塵機に導入し、再加熱器によって１８０℃に加熱してダイオキシン類分解装置に導入する方法であっても本発明に含まれる。
さらに、減温塔で１９５℃に減温した排ガスを、さらに１８５℃に減温してろ過式集塵機に導入し、再加熱器を経由せずに、直接ダイオキシン類分解装置に導入する方法であっても本発明に含まれる。 Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment and is included in the present invention even if there is a setting change or the like within a range not deviating from the gist of the invention. Is done.
For example, even when activated carbon having a pore volume of 2 nm or less in diameter of 40% or more or a majority of the total pores is used, it is included in the present invention.
Further, the reheater and the dioxin decomposition apparatus described in the above-described embodiment are not limited to this, and are included in the present invention even when a known technique is adopted.
Further, the exhaust gas temperature described in the above-described embodiment can be appropriately set, and the exhaust gas whose temperature has been reduced to 165 ° C. in the temperature reducing tower is further reduced to 155 ° C., introduced into the filtration type dust collector, and reheated. The present invention also includes a method of heating to 180 ° C. with a container and introducing it into a dioxin decomposition apparatus.
Further, the exhaust gas cooled to 195 ° C. in the temperature reducing tower is further cooled to 185 ° C. and introduced into the filtration type dust collector, and directly introduced into the dioxin decomposition apparatus without going through the reheater. Even included in the present invention.

１ ストーカ炉
２ ごみピット
３ ごみホッパ
４ 火格子
５ ボイラ
６ 減温装置
７ 活性炭貯留サイロ
８ ろ過式集塵機
９ 誘引通風機
１０ 再加熱器
１１ ダイオキシン類分解装置
１２ 煙突
1 Stoker furnace 2 Garbage pit 3 Garbage hopper 4 Grate 5 Boiler 6 Heat reducing device 7 Activated carbon storage silo 8 Filtration type dust collector 9 Attracting ventilator 10 Reheater 11 Dioxin decomposition device 12 Chimney

前記目的を達成するための手段として請求項１記載の燃焼排ガスの処理方法では、ダイオキシン類が吸着されにくい吸着剤を使用して排ガス中の水銀並びにダストを捕集する捕集工程と、前記捕集工程を通過した排ガスの再加熱を行いダイオキシン類を分解させる分解工程と、前記捕集工程において、排ガス中の水銀並びにダストを捕集した活性炭を回収する工程を有し、前記捕集工程において、２ｎｍ以下の細孔を有する活性炭を使用することを特徴とする。 The method for treating combustion exhaust gas according to claim 1 as a means for achieving the above object includes a collection step of collecting mercury and dust in the exhaust gas using an adsorbent that does not easily adsorb dioxin, and the above-mentioned collection. The collection step includes a decomposition step of reheating the exhaust gas that has passed through the collection step to decompose dioxin, and a step of recovering activated carbon that has collected mercury and dust in the exhaust gas in the collection step. It is characterized by using activated carbon having pores of 2 nm or less.

請求項２記載の燃焼排ガスの処理方法では、ダイオキシン類が吸着されにくい吸着剤を使用して排ガス中の水銀並びにダストを捕集する捕集工程と、前記捕集工程を通過した排ガスの再加熱を行いダイオキシン類を分解させる分解工程と、前記捕集工程において、排ガス中の水銀並びにダストを捕集した活性炭を回収する工程を有し、前記捕集工程において、２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用することを特徴とする。 In the method for treating combustion exhaust gas according to claim 2, a collection step of collecting mercury and dust in the exhaust gas using an adsorbent that does not easily adsorb dioxin, and a reheating of the exhaust gas that has passed the collection step. In the collection step, there is a step of recovering activated carbon that has collected mercury and dust in the exhaust gas, and the pore volume of 2 nm or less is small in the collection step. It is characterized by using activated carbon contained in a ratio of one-third or more with respect to the entire pores.

請求項３記載の燃焼排ガスの処理装置では、請求項１または２記載の処理方法に使用する装置であって、吸着剤を使用したろ過式集塵機と、捕集工程後の排ガスを加熱する加熱装置と、ダイオキシン類を分解するダイオキシン類分解装置を備えたことを特徴とする。 In the processing apparatus of the combustion exhaust gas according to claim 3 is an apparatus for use in processing method according to claim 1 or 2, wherein a filtration type dust collector using an adsorbent, a heating device for heating the exhaust gas after absorption step It is characterized by being equipped with a dioxin decomposition device that decomposes dioxins.

請求項１記載の燃焼排ガスの処理方法では、捕集工程において、２ｎｍ以下の細孔を有する活性炭を使用するので、分子サイズが大きなダイオキシン類は活性炭に吸着されないまたは吸着されにくい。そのため回収された飛灰中のダイオキシン類の含有率は低減される。 In the method for treating combustion exhaust gas according to claim 1, since activated carbon having pores of 2 nm or less is used in the collection step, dioxins having a large molecular size are not adsorbed or hardly adsorbed on the activated carbon. Therefore, the content of dioxins in the recovered fly ash is reduced.

請求項２記載の燃焼排ガスの処理方法では、捕集工程において、２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用するので、メソ孔やマクロ孔が多少混在する活性炭を使用する場合であっても、回収された飛灰中のダイオキシン類の低減効果は実現される。 In the method for treating combustion exhaust gas according to claim 2, activated carbon containing a pore volume of 2 nm or less at a ratio of 1/3 or more with respect to the entire pores is used in the collection step, so that mesopores and macros are used. Even when activated carbon with some pores is used, the effect of reducing dioxins in the recovered fly ash is realized.

本願の燃焼排ガスの処理方法では、分解工程において、排ガスの再加熱を行いダイオキシン類を分解するので、ろ過式集塵機で活性炭の吸着に適した温度に減温した排ガスを、ダイオキシン類の分解に適した温度に戻し、後続のダイオキシン類分解装置で確実に分解することができる。 In the method for treating combustion exhaust gas of the present application, the exhaust gas is reheated to decompose dioxins in the decomposition step. Therefore, the exhaust gas whose temperature has been reduced to a temperature suitable for adsorbing activated carbon by a filtration type dust collector is suitable for decomposition of dioxins. It can be returned to the normal temperature and can be reliably decomposed by the subsequent dioxin decomposition device.

請求項３記載の燃焼排ガスの処理装置では、吸着剤を使用したろ過式集塵機と、捕集工程後の排ガスを加熱する加熱装置と、ダイオキシン類を分解するダイオキシン類分解装置を備えたので、飛灰中のダイオキシン類の含有率を低く抑えられると共に、排ガス中のダイオキシン類を確実に分解することができる。 The combustion exhaust gas treatment device according to claim 3 is provided with a filtration type dust collector using an adsorbent, a heating device for heating the exhaust gas after the collection process, and a dioxin decomposition device for decomposing dioxins. The content of dioxins in the ash can be kept low, and the dioxins in the exhaust gas can be reliably decomposed.

Claims (6)

ダイオキシン類が吸着されにくい吸着剤を使用して排ガス中の水銀並びにダストを捕集する捕集工程と、
前記捕集工程を通過した排ガス中のダイオキシン類を分解させる分解工程とを有することを特徴とする燃焼排ガスの処理方法。 A collection process that collects mercury and dust in the exhaust gas using an adsorbent that does not easily adsorb dioxins,
A method for treating combustion exhaust gas, which comprises a decomposition step of decomposing dioxins in the exhaust gas that has passed through the collection step. 前記捕集工程において、２ｎｍ以下の細孔を有する活性炭を使用することを特徴とする請求項１記載の燃焼排ガスの処理方法。 The method for treating combustion exhaust gas according to claim 1, wherein activated carbon having pores of 2 nm or less is used in the collection step. 前記捕集工程において、２ｎｍ以下の細孔容積が細孔全体に対して３分の１以上の割合で含まれる活性炭を使用することを特徴とする請求項１記載の燃焼排ガスの処理方法。 The method for treating combustion exhaust gas according to claim 1, wherein in the collection step, activated carbon containing a pore volume of 2 nm or less at a ratio of 1/3 or more with respect to the entire pores is used. 吸着剤としてゼオライトを使用することを特徴とする請求項１記載の燃焼排ガスの処理方法。 The method for treating combustion exhaust gas according to claim 1, wherein zeolite is used as an adsorbent. 分解工程において、排ガスの再加熱を行いダイオキシン類を分解することを特徴とする請求項１、２、３または４記載の燃焼排ガスの処理方法。 The method for treating combustion exhaust gas according to claim 1, 2, 3 or 4, wherein in the decomposition step, the exhaust gas is reheated to decompose dioxins. 請求項１、２、３、４または５記載の処理方法に使用する装置であって、吸着剤を使用したろ過式集塵機と、捕集工程後の排ガスを加熱する加熱装置と、ダイオキシン類を分解するダイオキシン類分解装置を備えたことを特徴とする燃焼排ガスの処理装置。 A device used for the treatment method according to claim 1, 2, 3, 4 or 5, which decomposes a filtration type dust collector using an adsorbent, a heating device for heating exhaust gas after a collection step, and dioxins. A combustion exhaust gas treatment device characterized by being equipped with a dioxin decomposition device.
JP2019163912A 2019-09-09 2019-09-09 Combustion exhaust gas treatment method and device Active JP7202271B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2019163912A JP7202271B2 (en) 2019-09-09 2019-09-09 Combustion exhaust gas treatment method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2019163912A JP7202271B2 (en) 2019-09-09 2019-09-09 Combustion exhaust gas treatment method and device

Publications (2)

Publication Number Publication Date
JP2021041319A true JP2021041319A (en) 2021-03-18
JP7202271B2 JP7202271B2 (en) 2023-01-11

Family

ID=74861858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2019163912A Active JP7202271B2 (en) 2019-09-09 2019-09-09 Combustion exhaust gas treatment method and device

Country Status (1)

Country Link
JP (1) JP7202271B2 (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0775718A (en) * 1993-09-09 1995-03-20 Takuma Co Ltd Method for simultaneously removing heavy metal, chlorinated hydrocarbon and acidic gas in waste gas
JPH10249156A (en) * 1997-03-12 1998-09-22 Kato Kenji Method of removing dioxins in combustion treating system and device therefor
JPH11226394A (en) * 1998-02-12 1999-08-24 Unitika Ltd Adsorbing material for low-concentration organic chlorine compound
JP2009000662A (en) * 2007-06-25 2009-01-08 Kobelco Eco-Solutions Co Ltd Method and apparatus for treating exhaust gas of waste treatment equipment
JP2017060905A (en) * 2015-09-24 2017-03-30 太平洋セメント株式会社 Processing apparatus and method of cement kiln exhaust gas
JP2018089607A (en) * 2016-11-30 2018-06-14 株式会社カーボテック Mercury adsorbent

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0775718A (en) * 1993-09-09 1995-03-20 Takuma Co Ltd Method for simultaneously removing heavy metal, chlorinated hydrocarbon and acidic gas in waste gas
JPH10249156A (en) * 1997-03-12 1998-09-22 Kato Kenji Method of removing dioxins in combustion treating system and device therefor
JPH11226394A (en) * 1998-02-12 1999-08-24 Unitika Ltd Adsorbing material for low-concentration organic chlorine compound
JP2009000662A (en) * 2007-06-25 2009-01-08 Kobelco Eco-Solutions Co Ltd Method and apparatus for treating exhaust gas of waste treatment equipment
JP2017060905A (en) * 2015-09-24 2017-03-30 太平洋セメント株式会社 Processing apparatus and method of cement kiln exhaust gas
JP2018089607A (en) * 2016-11-30 2018-06-14 株式会社カーボテック Mercury adsorbent

Also Published As

Publication number Publication date
JP7202271B2 (en) 2023-01-11

Similar Documents

Publication Publication Date Title
KR101721614B1 (en) Apparatus and method for treating gas discharged from cement kiln
US6589318B2 (en) Adsorption powder for removing mercury from high temperature, high moisture gas streams
JP4022403B2 (en) Adsorbed powder for removing mercury from hot and humid gas streams
US6582497B1 (en) Adsorption power for removing mercury from high temperature high moisture gas streams
CN1033689C (en) Process of purifying loaded waste gases from oil burning device
JP2007039296A (en) Method and system for treating exhaust gas in cement manufacturing plant
JP6452484B2 (en) Mercury recovery system and mercury recovery method
JPH07299328A (en) Method of purifying exhaust gas
JP2007529305A (en) Method for reducing heavy metals in flue gas
JP2003286020A (en) Highly activated active coke powder and manufacturing method thereof
JPH01159514A (en) Method of decomposing noxious compound
Li et al. Reduction of heavy metal emissions by adding modified attapulgite to sludge in bubbling fluidized bed incineration process
HU210398B (en) Method for purifying polluted gases, in particular those from waste-incineration plants
Wielgosiński The possibilities of reduction of polychlorinated dibenzo‐p‐dioxins and polychlorinated dibenzofurans emission
JP7202271B2 (en) Combustion exhaust gas treatment method and device
JP4124584B2 (en) Removal method of dioxins in exhaust gas from waste treatment furnace
JP2008237959A (en) Method and apparatus for treating combustion exhaust gas
JP2001096134A (en) Treatment method of combustion gas containing heavy metal
JPH11257619A (en) City refuse combustion device
JPH10180038A (en) Waste gas simultaneous treating device and method thereof
JP2001000836A (en) Dry type waste gas treating method
JP2014174089A (en) Method for incinerating combustible waste containing radioactive cesium
JPS6331587A (en) Cleaning method for waste
JPH11226397A (en) Decomposition catalyst for hardly decomposable organic chlorine compound
JP6127113B1 (en) Radioactive contaminant treatment method and radioactive contaminant treatment facility

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190910

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200902

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20201023

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20210324

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20210612

C60 Trial request (containing other claim documents, opposition documents)

Free format text: JAPANESE INTERMEDIATE CODE: C60

Effective date: 20210612

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20210612

A911 Transfer to examiner for re-examination before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20210721

C21 Notice of transfer of a case for reconsideration by examiners before appeal proceedings

Free format text: JAPANESE INTERMEDIATE CODE: C21

Effective date: 20210726

A912 Re-examination (zenchi) completed and case transferred to appeal board

Free format text: JAPANESE INTERMEDIATE CODE: A912

Effective date: 20210917

C211 Notice of termination of reconsideration by examiners before appeal proceedings

Free format text: JAPANESE INTERMEDIATE CODE: C211

Effective date: 20211004

C22 Notice of designation (change) of administrative judge

Free format text: JAPANESE INTERMEDIATE CODE: C22

Effective date: 20220509

C22 Notice of designation (change) of administrative judge

Free format text: JAPANESE INTERMEDIATE CODE: C22

Effective date: 20220704

C13 Notice of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: C13

Effective date: 20220725

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20220822

C22 Notice of designation (change) of administrative judge

Free format text: JAPANESE INTERMEDIATE CODE: C22

Effective date: 20220831

C22 Notice of designation (change) of administrative judge

Free format text: JAPANESE INTERMEDIATE CODE: C22

Effective date: 20221003

C23 Notice of termination of proceedings

Free format text: JAPANESE INTERMEDIATE CODE: C23

Effective date: 20221024

C03 Trial/appeal decision taken

Free format text: JAPANESE INTERMEDIATE CODE: C03

Effective date: 20221201

C30A Notification sent

Free format text: JAPANESE INTERMEDIATE CODE: C3012

Effective date: 20221201

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20221223

R150 Certificate of patent or registration of utility model

Ref document number: 7202271

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150