JP4241693B2 - Combustion exhaust gas treatment method - Google Patents

Combustion exhaust gas treatment method Download PDF

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JP4241693B2
JP4241693B2 JP2005241100A JP2005241100A JP4241693B2 JP 4241693 B2 JP4241693 B2 JP 4241693B2 JP 2005241100 A JP2005241100 A JP 2005241100A JP 2005241100 A JP2005241100 A JP 2005241100A JP 4241693 B2 JP4241693 B2 JP 4241693B2
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heavy metal
exhaust gas
combustion exhaust
dust
metal adsorbent
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健一 薗田
寛 守富
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Metawater Co Ltd
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Description

本発明は、廃棄物焼却炉等から排出される重金属を含む燃焼排ガスの処理方法に関するものである。   The present invention relates to a method for treating combustion exhaust gas containing heavy metals discharged from a waste incinerator or the like.

廃棄物の燃焼排ガス中には、ダストのほかにＰｂ，Ｃｄ，Ａｓ，Ｓｅ等の重金属が含有されている。このような燃焼排ガスを処理する従来の代表的なシステムは図６に示す通りである。すなわち、焼却炉１から排出される８００℃以上の排ガスを空気予熱器２、白煙防止器３に通し、更に冷却器４に通して２００℃以下にまで冷却したうえでバグフィルタ５に導いてダストを除去し、更にスクラバ６に通してＮＯＸやＳＯＸを除去して大気中に放出している。 Waste combustion exhaust gas contains heavy metals such as Pb, Cd, As, and Se in addition to dust. A conventional typical system for treating such flue gas is as shown in FIG. That is, the exhaust gas of 800 ° C. or higher discharged from the incinerator 1 is passed through the air preheater 2 and the white smoke preventer 3, and further passed through the cooler 4 to be cooled to 200 ° C. or lower and led to the bag filter 5. to remove dust, it is released further to remove NO X and SO X through scrubber 6 to the atmosphere.

このような処理方法によれば、ダストと重金属とをバグフィルタ５で一挙に除去することができる。しかし、バグフィルタ５により回収されるダスト中に重金属及びダイオキシンが含まれるため、このダストの後処理が容易ではなく、埋設処分した場合にもダストからの重金属溶出のおそれがある。また図５に示すようにシステム構成が複雑となるうえ、スクラバ６等からの廃液処理の必要も生ずるために多くのコストがかかるという問題がある。   According to such a processing method, dust and heavy metal can be removed at once by the bag filter 5. However, since the heavy metal and dioxin are contained in the dust collected by the bag filter 5, post-treatment of this dust is not easy, and there is a risk of heavy metal elution from the dust even when buried. Further, as shown in FIG. 5, there is a problem that the system configuration is complicated and a waste liquid treatment from the scrubber 6 or the like is required, so that a lot of costs are required.

このほか、セラミックフィルタ等の高温集塵機を用いて５００〜８００℃の高温場でダストの除去を行う燃焼排ガスの処理方法も知られている。この方法はシステム構成が簡単となり廃液処理の必要もない利点がある。しかしこのような温度においては重金属成分の多くがガス化しているため、重金属は高温集塵機を通過してしまい、捕捉することは容易ではないという問題がある。   In addition, a combustion exhaust gas treatment method is also known in which dust is removed in a high temperature field of 500 to 800 ° C. using a high temperature dust collector such as a ceramic filter. This method has the advantage that the system configuration is simple and there is no need for waste liquid treatment. However, since many of the heavy metal components are gasified at such temperatures, there is a problem that the heavy metal passes through the high-temperature dust collector and cannot be easily captured.

排ガス経路に、高温集塵装置と低温集塵装置を設けて、ダストと重金属類を除去する技術が特許文献１に記載されている。また排ガス中の酸性物質の固定化生成物を集塵した後、残留している水銀を活性炭などの助剤によって集塵除去する技術が特許文献２に記載されている。また、排ガス経路に粘土粉体充填層を設けて灰ガス中の金属ヒュームを除去する技術が特許文献３に記載されている。これらの方法では、排ガス経路に重金属除去用装置を準備する必要があるため、設備費と運転費が嵩む問題がある。
特開平１０−１６５７４２号公報：特許請求の範囲、図５ 特開平０４−４５８２７号公報：特許請求の範囲、図５ 特開昭５２−６８０３９号公報：特許請求の範囲、図５ Patent Document 1 describes a technique for removing dust and heavy metals by providing a high-temperature dust collector and a low-temperature dust collector in an exhaust gas path. Further, Patent Document 2 discloses a technique for collecting and removing residual mercury by using an auxiliary agent such as activated carbon after collecting a fixed product of an acidic substance in exhaust gas. Patent Document 3 describes a technique for removing a metal fume in ash gas by providing a clay powder packed layer in an exhaust gas path. In these methods, since it is necessary to prepare an apparatus for removing heavy metals in the exhaust gas path, there is a problem that equipment costs and operating costs increase.
Japanese Patent Laid-Open No. 10-165742: Claims, FIG. JP 04-45827 A: Claims, FIG. JP 52-68039 A: Claims, FIG.

本発明は上記した従来の問題点を解決して、高温場において燃焼排ガス中からダストと重金属とを経済的に除去することができ、しかもダストの後処理が容易である燃焼排ガスの処理方法を提供するためになされたものである。   The present invention solves the above-mentioned conventional problems, and provides a method for treating combustion exhaust gas that can economically remove dust and heavy metals from the combustion exhaust gas in a high-temperature field and that is easy to post-process dust. It was made to provide.

上記の課題を解決するためになされた本発明の燃焼排ガスの処理方法は、流動炉である廃棄物焼却炉の燃焼排ガスを高温集塵機に通してダストを除去する燃焼排ガスの処理方法であって、重金属吸着材を粒状とし、前記流動炉の炉内で燃焼排ガスと接触させて重金属を吸着させた後、サイクロンでダストと分離して炉内に戻すとともに、前記流動炉から排出されたダストを含む排ガスを前記高温集塵機に通してそのダストを除去することを特徴とするものである。
また、定期的に重金属吸着材を交換するか、新しい重金属吸着材を投入して古いものを抜き出すようにするのがよい。また、重金属吸着材が粘土鉱物からなるものであることが好ましい。さらに、重金属吸着材がアロフェン、イモゴライト、ゼオライトのいずれかであることが好ましい。また、重金属吸着材が粘土鉱物に、ＣａＯを併用したものが好ましい。 Combustion exhaust gas treatment method of the present invention made to solve the above problems is a combustion exhaust gas treatment method of removing dust by passing the combustion exhaust gas of a waste incinerator that is a fluidized furnace through a high-temperature dust collector, The heavy metal adsorbent is granulated and contacted with combustion exhaust gas in the furnace of the fluidized furnace to adsorb heavy metal, and then separated from dust by a cyclone and returned to the furnace, and also includes dust discharged from the fluidized furnace The exhaust gas is passed through the high-temperature dust collector to remove the dust.
Also, it is preferable to periodically replace the heavy metal adsorbent or to insert a new heavy metal adsorbent and extract the old one. Moreover, it is preferable that a heavy metal adsorption material consists of clay minerals. Furthermore, the heavy metal adsorbent is preferably any of allophane, imogolite, and zeolite. In addition, the heavy metal adsorbent is preferably a clay mineral combined with CaO.

さらに、重金属を吸着させた重金属吸着材をｐＨ３〜１２の溶出液と接触させて分離回収する工程を付加することもできる。   Further, a step of separating and recovering the heavy metal adsorbent adsorbed with heavy metals by contacting with an eluate having a pH of 3 to 12 can be added.

本発明の燃焼排ガスの処理方法によれば、高温集塵機により高温場でダストを除去するためにシステム構成が簡単となり、また高温場においてガス化している重金属成分を粘土鉱物等からなる重金属吸着材に吸着させるため、重金属が大気中に放出されることがない。しかもダスト中には重金属は含まれないのでその後処理は容易であり、重金属が溶出するおそれもない。以下に図面を参照しつつ、本発明の好ましい実施形態を示す。   According to the combustion exhaust gas treatment method of the present invention, the system configuration is simplified to remove dust in a high-temperature field by a high-temperature dust collector, and the heavy metal component gasified in the high-temperature field is converted into a heavy metal adsorbent made of clay mineral or the like. Because it is adsorbed, heavy metals are not released into the atmosphere. Moreover, since heavy metals are not contained in the dust, the subsequent treatment is easy, and there is no possibility that heavy metals will elute. Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

図１は第１の参考形態を示す図であり、１０は例えば都市ごみや下水汚泥等を焼却するための廃棄物焼却炉である。この実施形態では流動床炉が用いられているが、これに限定されるものではない。その燃焼排ガス中には焼却灰を主体とするダストとともに、前記したような重金属が含まれていることがある。ダイオキシンの発生を抑制するために、燃焼排ガスは８００℃前後に維持されているのが普通である。なお、廃棄物焼却炉１０の炉内にはＣａＣｌ２等の脱硫剤を投入しておくものとする。 FIG. 1 is a diagram showing a first reference form , and 10 is a waste incinerator for incinerating, for example, municipal waste, sewage sludge and the like. In this embodiment, a fluidized bed furnace is used, but the present invention is not limited to this. The combustion exhaust gas may contain heavy metals as described above together with dust mainly composed of incineration ash. In order to suppress the generation of dioxins, the combustion exhaust gas is usually maintained at around 800 ° C. It is assumed that a desulfurization agent such as CaCl 2 is put into the furnace of the waste incinerator 10.

１１はセラミックフィルタ等の高温集塵機である。廃棄物焼却炉１０の燃焼排ガスは高温集塵機１１に導かれ、高温場でダストが除去される。ここで高温場とは５００〜８００℃の温度域を意味するものである。このような温度域では燃焼排ガス中の重金属成分の多くがガス化しており、高温集塵機１１で捕捉されることなく通過してしまう。そこで本発明ではガス化している重金属を重金属吸着材により吸着して除去する。この実施形態では、重金属吸着材が固定された吸着装置１２の内部に５００〜８００℃の燃焼排ガスを通し、重金属成分を吸着させる。   Reference numeral 11 denotes a high-temperature dust collector such as a ceramic filter. The combustion exhaust gas from the waste incinerator 10 is guided to the high temperature dust collector 11, and dust is removed in a high temperature field. Here, the high temperature field means a temperature range of 500 to 800 ° C. In such a temperature range, most of the heavy metal components in the combustion exhaust gas are gasified and pass without being captured by the high temperature dust collector 11. Therefore, in the present invention, the gasified heavy metal is adsorbed and removed by the heavy metal adsorbent. In this embodiment, the combustion exhaust gas at 500 to 800 ° C. is passed through the inside of the adsorption device 12 to which the heavy metal adsorbent is fixed, and the heavy metal component is adsorbed.

本発明では、好ましい重金属吸着材として粘土鉱物が用いられる。具体的には、モンモリロナイト、ハロイサイト、カオリン、ベントナイト、ディッカイト、イライト等の鉱物である。これらの粘土鉱物はＳｉ，Ａｌを主成分とする層状の結晶構造を有し、ＰｂやＣｄ等の重金属は層間に入り込んで固定されるものと考えられる。例えばカオリンの場合には、高温場においてはメタカオリンとなり、水分子が付加されるとＳｉ−Ｏ−、Ａｌ−Ｏ−の層状構造ができる。そこに燃焼排ガス中のＰｂＣｌ２やＣｄＣｌ２が通過すると、Ｓｉ−Ｏ−、Ａｌ−Ｏ−の構造の間に取り込まれ、ＰｂＯ、ＣｄＯ結合として固定される。またＡｓも高温場では不対電子により＋にチャージされており、ＰｂやＣｄと同様に、Ｓｉ−Ｏ−、Ａｌ−Ｏ−の層状構造の間に入り込んで固定されるものと考えられる。
このほか、重金属吸着材としてアロフェン、イモゴライト、ゼオライトのいずれかを用いることもできる。アロフェンはアルミニウムの含水珪酸塩であり、ガラス状の塊または粉末として産する。またゼオライトは周知のように珪酸質のイオン交換体である。 In the present invention, clay mineral is used as a preferred heavy metal adsorbent. Specifically, it is a mineral such as montmorillonite, halloysite, kaolin, bentonite, dickite, illite. These clay minerals have a layered crystal structure mainly composed of Si and Al, and heavy metals such as Pb and Cd are considered to enter and be fixed between the layers. For example, in the case of kaolin, it becomes metakaolin in a high temperature field, and when a water molecule is added, a layered structure of Si—O − and Al—O − is formed. When PbCl 2 or CdCl 2 in the combustion exhaust gas passes there, it is taken in between the structures of Si—O − and Al—O − and fixed as PbO and CdO bonds. In addition, As is charged to + by unpaired electrons in a high temperature field, it is considered that As is penetrated between the layered structures of Si—O − and Al—O − as in the case of Pb and Cd.
In addition, any one of allophane, imogolite, and zeolite can be used as the heavy metal adsorbent. Allophane is a hydrous silicate of aluminum and is produced as a glassy mass or powder. Zeolite is a siliceous ion exchanger as is well known.

このように、Ｐｂ、Ｃｄ、Ａｓは粘土鉱物等からなる重金属吸着材に高温場で確実に吸着されるが、燃焼排ガスに含まれる重金属のうちＳｅは粘土鉱物を用いてもあまり吸着されない。このため、Ｓｅの吸着材としてはＣａＯを用いることが好ましい。高温場でＳｅはＣａＯと反応してＣａＳｅとなり、８０％以上を除去することができる。このほか、珪藻土や下水汚泥の焼却灰にもＰｂ、Ｃｄ、Ａｓ等の重金属を吸着する能力があることが確認されているため、前記した粘土鉱物と併用することができる。
参考のため、上記した粘土鉱物等の重金属吸着効果を表１として示す。数値は実験に使用した試料ガス中から重金属を回収できた割合である。特にアロフェン、イモゴライト、ゼオライトを用いれば優れた回収率を達成できる。 As described above, Pb, Cd, and As are reliably adsorbed on the heavy metal adsorbent made of clay mineral or the like in a high temperature field, but Se is not so much adsorbed even if clay mineral is used among the heavy metals contained in the combustion exhaust gas. For this reason, it is preferable to use CaO as the Se adsorbent. In a high temperature field, Se reacts with CaO to become CaSe, and 80% or more can be removed. In addition, it has been confirmed that the incineration ash of diatomaceous earth and sewage sludge has the ability to adsorb heavy metals such as Pb, Cd, As, etc., and can be used in combination with the clay mineral described above.
For reference, Table 1 shows the effect of adsorbing heavy metals such as clay minerals. The numerical value is the rate at which heavy metals were recovered from the sample gas used in the experiment. In particular, if allophane, imogolite, or zeolite is used, an excellent recovery rate can be achieved.

Figure 0004241693
Figure 0004241693

このような重金属吸着材は種々の形態で用いることができるが、第１の参考形態では重金属吸着材を粒状またはハニカム状とし、吸着装置１２の内部に固定層として配置しておく。高温集塵機１１から出た高温の燃焼排ガスは吸着装置１２を通過する間にガス状の重金属成分を吸着される。なお重金属の種類により吸着に最適な温度が異なるため、吸着装置１２の内部に粒状またはハニカム状の重金属吸着材を直列に配置しておけば、次第にガス温度が低下してくるために、各温度域においてそれぞれ重金属を効率よく吸着させることができる。このようにしてダスト及び重金属が除去された燃焼排ガスは、空気予熱器１３で冷却されたうえ煙突１４から大気中に放出される。 Such a heavy metal adsorbent can be used in various forms. In the first reference embodiment, the heavy metal adsorbent is in the form of particles or honeycomb, and is arranged as a fixed layer inside the adsorber 12. The high-temperature combustion exhaust gas emitted from the high-temperature dust collector 11 is adsorbed with gaseous heavy metal components while passing through the adsorption device 12. Since the optimum temperature for adsorption differs depending on the type of heavy metal, if a granular or honeycomb heavy metal adsorbent is arranged in series in the adsorption device 12, the gas temperature gradually decreases. In each region, heavy metals can be adsorbed efficiently. The combustion exhaust gas from which dust and heavy metals have been removed in this manner is cooled by the air preheater 13 and then released from the chimney 14 into the atmosphere.

図２は第２の参考形態を示す図である。
この第２の参考形態では、吸着装置１２を別個に設けずに重金属吸着材を高温集塵機１１のフィルタエレメントに塗布して燃焼排ガスと接触させる。この場合、フィルタエレメントをハニカム状としてそのクリーン側に重金属吸着材を層状に塗布して焼結させておけば、重金属吸着材がダストにより覆われて接触効率が低下することがなく、また吸着重金属とダストとの分別が容易である。 FIG. 2 is a diagram showing a second reference embodiment.
In the second reference embodiment, the heavy metal adsorbent is applied to the filter element of the high-temperature dust collector 11 without separately providing the adsorbing device 12 and brought into contact with the combustion exhaust gas. In this case, if the filter element is formed in a honeycomb shape and the heavy metal adsorbent is applied in layers on the clean side and sintered, the heavy metal adsorbent is covered with dust and the contact efficiency does not decrease. And dust can be easily separated.

図３は第３の参考形態を示す図である。
この第３の参考形態では、重金属吸着材を粉粒状として高温集塵機１１の入口で燃焼排ガス内に噴霧し、燃焼排ガスと高温場で接触させる。噴霧された重金属吸着材は重金属を吸着し、高温集塵機１１のフィルタエレメントによりダストとともに回収される。重金属吸着材とダストとは粒度や比重が異なるために後工程で分離可能ではあるが、回収時には両者が混合状態にあるため、そのままでは従来法と同様に重金属を含むダストとなる欠点がある。またダスト量に重金属吸着材量が上乗せされるため、ダスト回収量が増加してしまう欠点もある。従ってこの第３の実施形態のような使用法は、前記した重金属吸着材を固定層として使用する方法が適用できない場合にのみ有効である。 FIG. 3 is a diagram showing a third reference embodiment.
In the third reference embodiment, the heavy metal adsorbent is sprayed into the combustion exhaust gas at the inlet of the high-temperature dust collector 11 in the form of powder and brought into contact with the combustion exhaust gas in a high temperature field. The sprayed heavy metal adsorbent adsorbs heavy metal and is collected together with dust by the filter element of the high-temperature dust collector 11. Since the heavy metal adsorbent and dust are separable in the subsequent process because the particle size and specific gravity are different, they are in a mixed state at the time of recovery. In addition, since the amount of heavy metal adsorbent is added to the amount of dust, there is a disadvantage that the amount of dust recovered increases. Therefore, the method of use as in the third embodiment is effective only when the method of using the heavy metal adsorbent described above as a fixed layer cannot be applied.

図４は本発明の実施形態を示す図である。
この第４の実施形態では、重金属吸着材を粒状とし、流動炉である廃棄物焼却炉１の炉内で燃焼排ガスと接触させる。廃棄物焼却炉１が流動炉であるので、燃焼排ガスとの間で高い接触効率を得ることができる。また重金属吸着材の粒度を適切に設定しておけば、サイクロンによりダストと分離して炉内に戻すことも可能である。この方法では炉内の重金属濃度が次第に増加するため、定期的に重金属吸着材を交換するか、常に新しい重金属吸着材を投入して古いものを抜き出す必要がある。なお、図４に示されるように、流動炉である廃棄物焼却炉１から排出されたダストを含む排ガスは、高温集塵機１１に通してそのダストを除去される。 FIG. 4 is a diagram showing an embodiment of the present invention .
In the fourth embodiment, the heavy metal adsorbent is granulated and brought into contact with the combustion exhaust gas in the furnace of the waste incinerator 1 which is a fluidized furnace . Since waste incinerator 1 is a flow reactor, it is possible to obtain a high contact efficiency between the flue gas. If the particle size of the heavy metal adsorbent is set appropriately, it can be separated from dust by a cyclone and returned to the furnace. In this method, since the heavy metal concentration in the furnace gradually increases, it is necessary to periodically replace the heavy metal adsorbent or to always introduce a new heavy metal adsorbent and extract the old one. In addition, as FIG. 4 shows, the waste gas containing the dust discharged | emitted from the waste incinerator 1 which is a fluidized furnace passes the high temperature dust collector 11, and the dust is removed.

図５は第４の参考形態を示す図である。
この実施形態では、重金属を吸着した重金属吸着材を溶出槽１５において溶出液と接触させ、重金属を溶離させる。溶出液としては排煙処理塔１６からの廃液を用いることができる。溶出液と重金属吸着剤との混合物は脱水機１７で固液分離され、重金属吸着材は再利用される。また溶出液はイオン交換樹脂１８に通液して重金属を回収したうえ、再び溶出槽１５に戻される。 FIG. 5 is a diagram showing a fourth reference embodiment .
In this embodiment, the heavy metal adsorbent adsorbing heavy metal is brought into contact with the eluent in the elution tank 15 to elute heavy metal. As the eluent, the waste liquid from the flue gas treatment tower 16 can be used. The mixture of the eluate and the heavy metal adsorbent is solid-liquid separated by the dehydrator 17 and the heavy metal adsorbent is reused. The eluate is passed through the ion exchange resin 18 to recover heavy metals and then returned to the elution tank 15 again.

なお、重金属吸着材としてカオリンを使用して塩化鉛を吸着させたうえ、ｐＨを３から１２の範囲内で変化させ、時間を０．５〜１２時間の範囲内で変化させながら溶出試験を行ったところ、表２の通りの結果が得られた。このデータに示されるように、ｐＨや溶出時間にかかわらず重金属吸着材に吸着された重金属を高い溶出率で溶出させることができることが確認された。   In addition, lead chloride was adsorbed using kaolin as a heavy metal adsorbent, and the elution test was performed while changing the pH within the range of 3 to 12 and changing the time within the range of 0.5 to 12 hours. As a result, the results shown in Table 2 were obtained. As shown in this data, it was confirmed that the heavy metal adsorbed on the heavy metal adsorbent can be eluted at a high elution rate regardless of pH and elution time.

Figure 0004241693
Figure 0004241693

以上に示したいずれの実施形態においても、高温集塵機により高温場でダストを除去するために図６に示した従来法よりもシステム構成が簡単となり、廃液処理の必要もない。また高温場においてガス化している重金属成分を粘土鉱物等からなる重金属吸着材に吸着させて除去するため、燃焼排ガス中の重金属が大気中に放出されることがないうえ、ダイオキシンの吸着効果も期待できる。またダスト中には重金属は含まれないのでダストの後処理は容易であり、ダスト中から重金属が溶出するおそれもない。更に使用される重金属吸着材は粘土鉱物等の安価な天然鉱物であるから、経済性に優れる利点もある。   In any of the above-described embodiments, the system configuration is simpler than the conventional method shown in FIG. 6 for removing dust in a high temperature field by a high temperature dust collector, and there is no need for waste liquid treatment. In addition, heavy metal components gasified in high-temperature fields are adsorbed and removed by heavy metal adsorbents made of clay minerals, etc., so that heavy metals in combustion exhaust gas are not released into the atmosphere, and dioxin adsorption is also expected. it can. Further, since heavy metal is not contained in the dust, the post-treatment of the dust is easy, and there is no possibility that the heavy metal is eluted from the dust. Furthermore, since the heavy metal adsorbent used is an inexpensive natural mineral such as clay mineral, there is an advantage that it is excellent in economy.

本発明の第１の参考形態を示す系統図である。It is a systematic diagram which shows the 1st reference form of this invention. 本発明の第２の参考形態を示す系統図である。It is a systematic diagram which shows the 2nd reference form of this invention. 本発明の第３の参考形態を示す系統図である。It is a systematic diagram which shows the 3rd reference form of this invention. 本発明の実施形態を示す系統図である。It is a systematic diagram showing an embodiment of the present invention . 本発明の第４の参考形態を示す系統図であるIt is a systematic diagram which shows the 4th reference form of this invention. 従来例を示す系統図である。It is a systematic diagram which shows a prior art example.

符号の説明Explanation of symbols

１ 焼却炉、２ 空気予熱器、３ 白煙防止器、４ 冷却器、５ バグフィルタ、６ スクラバ、１０ 廃棄物焼却炉、１１ 高温集塵機、１２ 吸着装置、１３ 空気予熱器、１４ 煙突、１５ 溶出槽、１６ 排煙処理塔、１７ 脱水機、１８ イオン交換樹脂   DESCRIPTION OF SYMBOLS 1 Incinerator, 2 Air preheater, 3 White smoke preventer, 4 Cooler, 5 Bag filter, 6 Scrubber, 10 Waste incinerator, 11 High temperature dust collector, 12 Adsorber, 13 Air preheater, 14 Chimney, 15 Elution Tank, 16 Flue gas treatment tower, 17 Dehydrator, 18 Ion exchange resin

Claims (4)

流動炉である廃棄物焼却炉の燃焼排ガスを高温集塵機に通してダストを除去する燃焼排ガスの処理方法であって、重金属吸着材を粒状とし、前記流動炉の炉内で燃焼排ガスと接触させて重金属を吸着させた後、サイクロンでダストと分離して炉内に戻すとともに、前記流動炉から排出されたダストを含む排ガスを前記高温集塵機に通してそのダストを除去することを特徴とする燃焼排ガスの処理方法。 A combustion exhaust gas treatment method for removing dust by passing a combustion exhaust gas from a waste incinerator , which is a fluidized furnace , through a high-temperature dust collector, wherein the heavy metal adsorbent is granulated and brought into contact with the combustion exhaust gas in the furnace of the fluidized furnace. Combustion exhaust gas characterized in that after heavy metal is adsorbed, it is separated from dust with a cyclone and returned to the furnace, and exhaust gas containing dust discharged from the fluidized furnace is passed through the high-temperature dust collector to remove the dust. Processing method. 前記重金属吸着材を定期的に交換する、または新しい重金属吸着材を投入して古い重金属吸着材を抜き出すようにした請求項１に記載の燃焼排ガスの処理方法。   The method for treating a combustion exhaust gas according to claim 1, wherein the heavy metal adsorbent is periodically replaced or a new heavy metal adsorbent is introduced to extract an old heavy metal adsorbent. 重金属吸着材が粘土鉱物からなるものである請求項１または２に記載の燃焼排ガスの処理方法。   The method for treating a combustion exhaust gas according to claim 1 or 2, wherein the heavy metal adsorbent is made of clay mineral. 重金属吸着材が粘土鉱物に、ＣａＯを併用したものである請求項１または２に記載の燃焼排ガスの処理方法。   The method for treating combustion exhaust gas according to claim 1 or 2, wherein the heavy metal adsorbent is a clay mineral combined with CaO.
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