JP2005087867A - Exhaust gas treatment method - Google Patents

Exhaust gas treatment method Download PDF

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JP2005087867A
JP2005087867A JP2003324526A JP2003324526A JP2005087867A JP 2005087867 A JP2005087867 A JP 2005087867A JP 2003324526 A JP2003324526 A JP 2003324526A JP 2003324526 A JP2003324526 A JP 2003324526A JP 2005087867 A JP2005087867 A JP 2005087867A
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exhaust gas
alkaline
treatment method
waste
heated
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JP4434673B2 (en
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Mitsuo Kuwabara
光雄 桑原
Nobuo Tajima
宣夫 田島
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Honda Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for treating an exhaust gas that is capable of efficiently performing a decomposition treatment of dioxins included in the exhaust gas. <P>SOLUTION: The method for treating the exhaust gas comprises sending the exhaust gas 3 discharged upon conducting the incineration treatment of wastes into an alkaline hot water washing tower 5 which jets an alkaline washing solution 8 heated to 60-70°C, contacting the heated alkaline washing solution 8 with the exhaust gas to adsorb a harmful gas containing dioxins in the exhaust gas and decomposing and removing the same. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、排ガス処理方法に係り、特に廃棄物を焼却処理する際に排出される排ガス中の有害ガスを処理する排ガス処理方法に関する。   The present invention relates to an exhaust gas treatment method, and more particularly, to an exhaust gas treatment method for treating harmful gas in exhaust gas discharged when incineration treatment of waste.

一般家庭ごみや産業廃棄物等の大部分は焼却炉で焼却処理されている。この際、排出される排ガス中には有害ガス（ダイオキシン、窒素酸化物等）が含まれている。   Most household waste and industrial waste are incinerated in an incinerator. At this time, the exhaust gas discharged contains harmful gases (dioxin, nitrogen oxides, etc.).

このため、従来、これらの有害ガスを除去処理するために、噴霧されるアルカリ液（洗浄液）中に排ガスを通して有害ガスを除去する排ガス処理装置が提案されている。（例えば、特許文献１参照。）。
特開平９−２７６６４９号公報 For this reason, conventionally, in order to remove these harmful gases, there has been proposed an exhaust gas treatment apparatus that removes harmful gases through the exhaust gas in the sprayed alkaline liquid (cleaning liquid). (For example, refer to Patent Document 1).
JP-A-9-276649

ところで、上記特許文献１に開示されているような排ガス処理装置では、排ガスに洗浄液としてアルカリ液を噴射して、排ガス中の有害ガス（酸性ガス）を分解して除去するようにしているが、常温のアルカリ液では排ガス中に含まれているダイオキシンの分解効率が低く、排ガス中に含まれているダイオキシンを効率よく分解処理することができなかった。   By the way, in the exhaust gas treatment apparatus as disclosed in the above Patent Document 1, an alkaline liquid is injected as a cleaning liquid into the exhaust gas to decompose and remove harmful gas (acid gas) in the exhaust gas. The decomposition solution of dioxin contained in the exhaust gas was low in the alkaline solution at room temperature, and the dioxin contained in the exhaust gas could not be efficiently decomposed.

そこで本発明は、排ガス中に含まれているダイオキシンを効率よく分解処理することができる排ガス処理方法を提供することを目的とする。   Therefore, an object of the present invention is to provide an exhaust gas treatment method capable of efficiently decomposing dioxin contained in exhaust gas.

上記目的を達成するために本発明は、廃棄物を焼却処理する際に排出される排ガス中の有害ガスを処理する排ガス処理方法であって、６０〜７０℃に加温されたアルカリ洗浄液を噴射するアルカリ温水洗浄塔に、廃棄物を焼却処理する際に排出される排ガスを送り込み、前記加温されたアルカリ洗浄液を前記排ガスに接触させて、前記排ガス中のダイオキシンを含む有害ガスを吸着させると共に、分解して除去することを特徴としている。   In order to achieve the above object, the present invention is an exhaust gas treatment method for treating harmful gases in exhaust gas discharged when incineration waste, and injects an alkaline cleaning liquid heated to 60 to 70 ° C. The exhaust gas discharged when incineration the waste is sent to the alkaline hot water cleaning tower, and the heated alkaline cleaning liquid is brought into contact with the exhaust gas to adsorb the harmful gas containing dioxin in the exhaust gas. It is characterized by disassembling and removing.

（作用）
本発明によれば、アルカリ温水洗浄塔内に送り込まれる排ガスを、６０〜７０℃程度に加温したアルカリ液で排ガスを洗浄することによって排ガス中のダイオキシンの分解が促進されることによって、排ガス中のダイオキシンを殆ど除去することができる。 (Function)
According to the present invention, the exhaust gas fed into the alkaline hot water cleaning tower is washed with an alkaline liquid heated to about 60 to 70 ° C., whereby the decomposition of dioxins in the exhaust gas is promoted, whereby the exhaust gas Most of the dioxin can be removed.

本発明の排ガス処理方法によれば、６０〜７０℃に加温されたアルカリ洗浄液を噴射するアルカリ温水洗浄塔に、廃棄物を焼却処理する際に排出される排ガスを送り込み、噴射される加温されたアルカリ洗浄液を排ガスに接触させることによって、排ガス中のダイオキシンの分解が促進されることによって、排ガス中のダイオキシンを殆ど除去することが可能となる。   According to the exhaust gas treatment method of the present invention, exhaust gas discharged when incinerating waste is sent to an alkaline hot water cleaning tower that injects an alkaline cleaning liquid heated to 60 to 70 ° C. By bringing the alkaline washing liquid thus made into contact with the exhaust gas, the decomposition of dioxins in the exhaust gas is promoted, so that it is possible to remove most of the dioxins in the exhaust gas.

以下、本発明を図示の実施の形態に基づいて説明する。   Hereinafter, the present invention will be described based on the illustrated embodiments.

図１は、本発明の実施の形態に係る排ガス処理方法によって排ガスの処理を行う排ガス処理装置を示す概略構成図である。図１に示す排ガス処理装置は、アルカリ温水洗浄塔５と蒸気洗浄塔９を備えており、焼却炉１で廃棄物を焼却する際に排出口２から排出される排ガス３は、ブロア４の作動によって排ガス導入口５ａからアルカリ温水洗浄塔５に送り込まれる。なお、本実施の形態における焼却炉１で焼却される廃棄物は、廃車からバンパー、エンジン、ガラス、タイヤ等のリサイクル可能な部材を選別して取り除いた残りの廃車ガラをシュレッダーによって細かく粉砕して得られたシュレッダーダストなどである。   FIG. 1 is a schematic configuration diagram illustrating an exhaust gas treatment apparatus that performs exhaust gas treatment by an exhaust gas treatment method according to an embodiment of the present invention. The exhaust gas treatment apparatus shown in FIG. 1 includes an alkaline hot water cleaning tower 5 and a steam cleaning tower 9, and the exhaust gas 3 discharged from the discharge port 2 when the waste is incinerated in the incinerator 1 is operated by the blower 4. Is sent from the exhaust gas inlet 5a to the alkaline hot water cleaning tower 5. In addition, the waste incinerated in the incinerator 1 in the present embodiment is finely pulverized by using a shredder for the remaining waste car waste that has been removed by sorting out recyclable parts such as bumpers, engines, glass, and tires from the waste car. It is the shredder dust obtained.

アルカリ温水洗浄塔５内には、アルカリ洗浄液８を下方に向けて噴射する複数のノズル６と、各ノズル６の上方に設けた複数の細孔を有するアルカリ液分離部材７が設置されている。蒸気洗浄塔９内には、蒸気１１を下方に向けて噴射する複数のノズル１０が設置されている。   In the alkaline hot water cleaning tower 5, a plurality of nozzles 6 for spraying the alkaline cleaning liquid 8 downward and an alkaline liquid separating member 7 having a plurality of pores provided above the nozzles 6 are installed. A plurality of nozzles 10 for injecting steam 11 downward are installed in the steam cleaning tower 9.

次に、本実施の形態に係る排ガス処理方法について説明する。   Next, the exhaust gas treatment method according to the present embodiment will be described.

焼却炉１に投入された廃棄物（シュレッダーダスト）を燃焼処理すると排出口２から有害ガス（ダイオキシンなど）等を含んだ排ガス３が排出され、この排ガス３はブロア４の作動によって排ガス導入口５ａからアルカリ温水洗浄塔５に送り込まれる。   When the waste (shredder dust) thrown into the incinerator 1 is burned, the exhaust gas 3 containing harmful gas (dioxin etc.) is discharged from the exhaust port 2, and the exhaust gas 3 is discharged into the exhaust gas inlet 5 a by the operation of the blower 4. To the alkaline hot water washing tower 5.

なお、焼却炉１の排出口２とブロア４間に、排ガス３を２次燃焼させる２次燃焼器（不図示）、高温の排ガスを急冷する冷却塔（不図示）、排ガス中の細かい塵を回収する徐塵機（不図示）等を設置することによって、有害ガスや塵の少ない排ガス３をアルカリ温水洗浄塔５に送り込むことができる。即ち、２次燃焼器（不図示）によって排ガス中のＣＯの低減や未燃ガスの燃焼を行い、冷却塔（不図示）によって高温（７００〜９００℃）の排ガスを８０〜１００℃程度に急冷してダイオキシンの生成を低減する。更に、徐塵機（不図示）によって排ガス中の粉塵を回収する。   A secondary combustor (not shown) for secondary combustion of the exhaust gas 3 between the discharge port 2 and the blower 4 of the incinerator 1, a cooling tower (not shown) for rapidly cooling the high temperature exhaust gas, and fine dust in the exhaust gas are removed. By installing a gradual dust collection machine (not shown) or the like to collect, the exhaust gas 3 with little harmful gas or dust can be sent into the alkaline hot water washing tower 5. That is, CO in the exhaust gas is reduced or unburned gas is combusted by a secondary combustor (not shown), and high-temperature (700 to 900 ° C.) exhaust gas is rapidly cooled to about 80 to 100 ° C. by a cooling tower (not shown) And reducing the production of dioxins. Furthermore, dust in the exhaust gas is recovered by a gradual duster (not shown).

アルカリ温水洗浄塔５内に送り込まれた排ガスは、各ノズル６から下方に向けて噴射される加温（６０〜７０℃程度）されたアルカリ洗浄液８によって洗浄される。ノズル６から噴射されるアルカリ洗浄液８は、例えば水に水酸化ナトリウム等を適量付加して成分調製されたアルカリ液であり、更に、本実施の形態では、このアルカリ液を６０〜７０℃程度に加温している。なお、アルカリ温水洗浄塔５内の下部に溜まったアルカリ洗浄液は回収され、一部は再処理して再利用される。   The exhaust gas sent into the alkaline hot water cleaning tower 5 is cleaned by the heated alkaline cleaning liquid 8 (about 60 to 70 ° C.) sprayed downward from each nozzle 6. The alkaline cleaning liquid 8 sprayed from the nozzle 6 is an alkaline liquid prepared by adding an appropriate amount of sodium hydroxide or the like to water, for example, and in this embodiment, the alkaline liquid is heated to about 60 to 70 ° C. Warming up. Note that the alkaline cleaning liquid accumulated in the lower part of the alkaline hot water cleaning tower 5 is recovered, and a part thereof is reprocessed and reused.

排ガスが加温されたアルカリ洗浄液８と接触することによって、排ガス中に含まれる粉塵や有害ガス（ＮＯｘ、ＳＯｘ、ＨＣｌ、ダイオキシン等）がミスト状態や水滴状態のアルカリ洗浄液に吸着され、更に、ダイオキシンの分解が促進された。本願発明者の実験によれば、常温のアルカリ液で排ガスを洗浄する場合に比べて、６０〜７０℃程度に加温したアルカリ液で排ガスを洗浄すると、排ガス中のダイオキシンが効率よく分解されることを確認した。   By contacting the exhaust gas with the heated alkaline cleaning liquid 8, dust and harmful gases (NOx, SOx, HCl, dioxin, etc.) contained in the exhaust gas are adsorbed by the alkaline cleaning liquid in the mist state or water droplet state, and further, dioxin. The decomposition of was promoted. According to the experiments of the present inventor, dioxins in the exhaust gas are efficiently decomposed when the exhaust gas is washed with an alkaline liquid heated to about 60 to 70 ° C., compared to when the exhaust gas is washed with an alkaline liquid at room temperature. It was confirmed.

アルカリ温水洗浄塔５内で加温されたアルカリ洗浄液８によって粉塵や有害ガス（ＮＯｘ、ＳＯｘ、ＨＣｌ、ダイオキシン等）が除去された排ガスは、アルカリ液分離部材７の複数の細孔を通してアルカリ洗浄液が分離回収され、排ガス導入口９ａから蒸気洗浄塔９に送り込まれる。   The exhaust gas from which dust and harmful gases (NOx, SOx, HCl, dioxin, etc.) have been removed by the alkaline cleaning liquid 8 heated in the alkaline hot water cleaning tower 5 is passed through the plurality of pores of the alkaline liquid separating member 7 to obtain the alkaline cleaning liquid. Separated and recovered, and sent to the steam cleaning tower 9 from the exhaust gas inlet 9a.

蒸気洗浄塔９に送り込まれた排ガスは、各ノズル１０から下方に向けて噴霧される蒸気１１によって洗浄され、排ガス中に僅かに残留している粉塵や有害ガスを吸着して除去する。なお、蒸気洗浄塔９内の下部に溜まった水は回収され、一部は再処理して再利用される。   The exhaust gas sent to the steam cleaning tower 9 is cleaned by the steam 11 sprayed downward from each nozzle 10, and adsorbs and removes dust and harmful gas slightly remaining in the exhaust gas. In addition, the water collected in the lower part in the steam cleaning tower 9 is collected, and a part is reprocessed and reused.

蒸気洗浄塔９内で噴射される蒸気１１によって僅かに残留している粉塵や有害ガスが吸収されて除去された排ガスは、水切りされた後にブロア１２の作動によって煙突１３から大気中に排出される。   Exhaust gas that has been slightly absorbed and removed by the dust 11 and the harmful gases that have been absorbed by the steam 11 injected in the steam cleaning tower 9 is drained and then discharged from the chimney 13 into the atmosphere by the operation of the blower 12. .

このように、本実施の形態に係る排ガス処理方法では、アルカリ温水洗浄塔５内に送り込まれる排ガスを６０〜７０℃程度に加温したアルカリ洗浄液８で洗浄することによって、排ガス中のダイオキシンの分解が促進され、排ガス中のダイオキシンを殆ど除去することができた。   Thus, in the exhaust gas treatment method according to the present embodiment, the exhaust gas sent into the alkaline hot water cleaning tower 5 is cleaned with the alkaline cleaning liquid 8 heated to about 60 to 70 ° C., so that the dioxins in the exhaust gas are decomposed. Was promoted, and almost all dioxins in the exhaust gas could be removed.

なお、上述した実施の形態では、廃車からバンパー、エンジン、ガラス、タイヤ等のリサイクル可能な部材を選別して取り除いた残りの廃車ガラをシュレッダーによって細かく粉砕して得られたシュレッダーダストを焼却した際の排ガスを処理する例について説明したが、生活ごみや産業廃棄物等を焼却した際の排ガスの処理についても同様に本発明を適用することができる。   In the above-described embodiment, when the shredder dust obtained by finely pulverizing the remaining scrapped car waste from the scrapped car by using a shredder after removing recyclable members such as bumpers, engines, glass, and tires from the scrapped car is incinerated. Although the example which processes this waste gas was demonstrated, this invention is applicable similarly also to the process of waste gas at the time of incinerating domestic waste, industrial waste, etc.

本発明の実施の形態に係る排ガス処理方法によって排ガスの処理を行う排ガス処理装置を示す概略構成図。BRIEF DESCRIPTION OF THE DRAWINGS Schematic block diagram which shows the waste gas processing apparatus which processes waste gas by the waste gas processing method which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１ 焼却炉
２ 排出口
３ 排ガス
５ アルカリ温水洗浄塔
７ アルカリ液分離部材
８ アルカリ洗浄液
９ 蒸気洗浄塔
１１ 蒸気

DESCRIPTION OF SYMBOLS 1 Incinerator 2 Outlet 3 Exhaust gas 5 Alkali warm water washing tower 7 Alkali liquid separation member 8 Alkaline washing liquid 9 Steam washing tower 11 Steam

Claims (1)

廃棄物を焼却処理する際に排出される排ガス中の有害ガスを処理する排ガス処理方法であって、
６０〜７０℃に加温されたアルカリ洗浄液を噴射するアルカリ温水洗浄塔に、廃棄物を焼却処理する際に排出される排ガスを送り込み、前記加温されたアルカリ洗浄液を前記排ガスに接触させて、前記排ガス中のダイオキシンを含む有害ガスを吸着させると共に、分解して除去する、
ことを特徴とする排ガス処理方法。

An exhaust gas treatment method for treating harmful gas in exhaust gas discharged when incinerating waste,
Sending exhaust gas discharged when incinerating waste to an alkaline hot water cleaning tower that injects an alkaline cleaning liquid heated to 60 to 70 ° C., bringing the heated alkaline cleaning liquid into contact with the exhaust gas, Adsorbs harmful gas containing dioxin in the exhaust gas and decomposes and removes it,
An exhaust gas treatment method characterized by that.

JP2003324526A 2003-09-17 2003-09-17 Exhaust gas treatment method Expired - Fee Related JP4434673B2 (en)

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JP4434673B2 JP4434673B2 (en) 2010-03-17

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101822942A (en) * 2010-05-26 2010-09-08 刘阳生 Wet purification method for dioxin and heavy metals in solid waste incineration gas
WO2016099246A3 (en) * 2014-12-19 2017-01-19 Cinovatec S.A. De C.V. Method for cleaning polluting combustion fumes
CN109876583A (en) * 2019-04-10 2019-06-14 广州众智教育咨询有限公司 The flue gas purification device of industrial energy saving environmental protection
CN111234883A (en) * 2020-01-20 2020-06-05 河北燕钢科技有限公司 Coal gas double-tower washing and purifying system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101822942A (en) * 2010-05-26 2010-09-08 刘阳生 Wet purification method for dioxin and heavy metals in solid waste incineration gas
WO2016099246A3 (en) * 2014-12-19 2017-01-19 Cinovatec S.A. De C.V. Method for cleaning polluting combustion fumes
CN109876583A (en) * 2019-04-10 2019-06-14 广州众智教育咨询有限公司 The flue gas purification device of industrial energy saving environmental protection
CN111234883A (en) * 2020-01-20 2020-06-05 河北燕钢科技有限公司 Coal gas double-tower washing and purifying system

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