JPH034920A - Removal of dioxin discharged from incinerator - Google Patents
Removal of dioxin discharged from incineratorInfo
- Publication number
- JPH034920A JPH034920A JP1138828A JP13882889A JPH034920A JP H034920 A JPH034920 A JP H034920A JP 1138828 A JP1138828 A JP 1138828A JP 13882889 A JP13882889 A JP 13882889A JP H034920 A JPH034920 A JP H034920A
- Authority
- JP
- Japan
- Prior art keywords
- incinerator
- flue gas
- exhaust gas
- dioxin
- dioxins
- 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.)
- Pending
Links
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 title abstract 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- 150000002013 dioxins Chemical class 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 abstract description 34
- 239000000428 dust Substances 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract 8
- 239000003546 flue gas Substances 0.000 abstract 8
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 8
- 239000012717 electrostatic precipitator Substances 0.000 description 5
- 229910001868 water Inorganic materials 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000006864 oxidative decomposition reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、都市ごみ、産業廃棄物などの焼却炉から出
る排出ガス中のダイオキシンを酸化分解するダイオキシ
ンの除去方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing dioxin by oxidizing and decomposing dioxins in exhaust gas emitted from incinerators for municipal waste, industrial waste, and the like.
［従来技術およびその問題点コ
ごみ焼却炉など排出ガス中のダイオキシンは、その生成
過程に不明な点が多いが、焼却炉後流の低温域で灰分の
存在下に発生し、水に不溶な物質である。ダイオキシン
は、排ガス中には微量しか含まれていないが、微量でも
人体に対し極めて有毒で特に強い発癌性を示す物質であ
り、ごみ焼却炉排ガスの新たな公害問題を引き起二°す
ものとして最近大きくクローズアップされつつある。[Prior art and its problems Dioxins in the exhaust gas from garbage incinerators have many unknown points about their formation process, but they are generated in the presence of ash in the low-temperature region after the incinerator, and are insoluble in water. It is a substance. Dioxins are contained in only trace amounts in exhaust gas, but even in trace amounts, they are extremely toxic to the human body and exhibit particularly strong carcinogenic properties, and are thought to cause new pollution problems from waste incinerator exhaust gas. Recently, it has been attracting a lot of attention.
従来の排ガス処理方法では、そのフローを第２図に示す
ように、ごみ焼却炉（１）で発生した排ガスは、煙突（
５）近くの吸引ファン（４）によって同炉（１）の頂部
出口から吸引排出され、電気集塵機（２）で除塵された
後、排ガス洗浄処理装置（３）で湿式洗浄処理され、処
理排ガスが煙突（５）から大気中へ放散される。しかし
、この排ガス処理フローではダイオキシンは湿式洗浄処
理によってほとんど吸収除去できず、そのまま大気中へ
放散されているのが現状である。In the conventional exhaust gas treatment method, the exhaust gas generated in the garbage incinerator (1) is passed through the chimney (
5) The exhaust gas is sucked out from the top outlet of the furnace (1) by a nearby suction fan (4), removed by an electrostatic precipitator (2), and then subjected to wet cleaning treatment by an exhaust gas cleaning treatment device (3). It is released into the atmosphere from the chimney (5). However, in this exhaust gas treatment flow, dioxins are hardly absorbed and removed by wet cleaning treatment, and are currently released into the atmosphere as they are.
最近、これを改良するものとして、第３図に示すように
、ごみ焼却炉（１）の頂部出口から排出された排ガスに
Ｃａ（ＯＨ）２スラリーを吹き込み、その後流のバグフ
ィルタ−（８）で除塵を行ない、排ガス中のダイオキシ
ンを半乾式でバグ灰と一緒に除去することが検討されて
いる。Recently, as an improvement on this, as shown in Fig. 3, Ca(OH)2 slurry is blown into the exhaust gas discharged from the top outlet of the waste incinerator (1), and a bag filter (8) is placed downstream. A semi-dry process is being considered to remove the dioxins in the exhaust gas together with the bug ash.
しかし、この方法ではバグ灰中のダイオキシンの処理が
未解決の問題として残されている。However, with this method, the treatment of dioxins in bag ash remains an unsolved problem.
この発明は、上記の如き実情に鑑み、焼却炉排出ガス中
のダイオキシンを酸化分解することによって除去するダ
イオキシンの除去方法を提供することを目的とする。In view of the above-mentioned circumstances, an object of the present invention is to provide a method for removing dioxin by oxidizing and decomposing the dioxin in the incinerator exhaust gas.
［問題点の解決手段］
この発明によるダイオキシンの除去方法は、上記目的の
達成のために、焼却炉排出ガス中のダイオキシンを酸化
触媒に接触させて、ＨＣｌ、Ｈ２ＯおよびＣＯ２に酸化
することを特徴とする。[Means for Solving Problems] In order to achieve the above object, the method for removing dioxin according to the present invention is characterized by bringing dioxin in the incinerator exhaust gas into contact with an oxidation catalyst to oxidize it into HCl, H2O and CO2. shall be.
ダイオキシンと酸化触媒との接触は、電気集塵機の後流
で行なうのが好ましい。酸化触媒としては汎用の触媒が
使用できる。The contact between the dioxins and the oxidation catalyst is preferably carried out downstream of the electrostatic precipitator. A general-purpose catalyst can be used as the oxidation catalyst.
［作 用］
この発明による焼却炉排出ダイオキシンの除去方法では
、焼却炉排出ガス中のダイオキシンは酸化触媒の存在下
にＨＣｌ、Ｈ２ＯおよびＣ０２に効果的に酸化される。[Function] In the method for removing dioxins discharged from an incinerator according to the present invention, dioxins in the incinerator exhaust gas are effectively oxidized to HCl, H2O and CO2 in the presence of an oxidation catalyst.
この酸化分解反応は３００℃程度の比較的低い温度で進
行する。This oxidative decomposition reaction proceeds at a relatively low temperature of about 300°C.
こうして、ダイオキシンを含まない排ガスが大気中に放
出される。Thus, dioxin-free exhaust gas is released into the atmosphere.
［実施例］
つぎに、図示の実施例によりこの発明を具体的に説明す
る。[Example] Next, the present invention will be specifically explained with reference to the illustrated example.
第１図にこの発明による焼却炉排出ダイオキシンの除去
方法のフローを示す。同図において、ごみ焼却炉（１）
で発生した排ガスは、後流の吸引ファン（４）によって
ごみ焼却炉（１）の頂部出口から吸引排出され、電気集
塵機（２）で除塵された後、酸化触媒を充填した酸化反
応器（７）に通されてここで酸化処理される。電気集塵
機（２）としては高温型のものを使用するのが好ましい
。FIG. 1 shows a flowchart of a method for removing dioxins discharged from an incinerator according to the present invention. In the same figure, garbage incinerator (1)
The exhaust gas generated at ) where it is oxidized. It is preferable to use a high temperature type electrostatic precipitator (2).
ついで、排ガスは洗浄処理装置すなわち湿式有害ガス除
去装置（３）で洗浄処理され、処理排ガスが煙突（５）
から大気中へ放散される。Next, the exhaust gas is cleaned in a cleaning treatment device, that is, a wet harmful gas removal device (3), and the treated exhaust gas is sent to the chimney (5).
is emitted into the atmosphere.
この排ガス処理フローでは、まず高温型の電気集塵機（
２）によって排ガス中のダストを予め除去しておく。こ
のダスト除去によって、ダスト付着による酸化触媒の性
能低下が防止される。In this exhaust gas treatment flow, we first use a high-temperature electrostatic precipitator (
2) to remove dust in the exhaust gas in advance. This dust removal prevents the performance of the oxidation catalyst from deteriorating due to dust adhesion.
ついで、酸化反応器（７）において、酸化触媒の存在下
に温度３００℃程度で排ガス中の酸素によってダイオキ
シンを酸化する。この酸化によってダイオキシンはＩＣ
／、Ｈ２０およびＣ０２に分解される。この分解生成物
のうちＨＣｌは排ガス中のＳＯｘなどと共に後流の湿式
有害ガス除去装置（３）で除去される。こうして無害化
された排ガスは煙突（５）から大気中へ放散される。Next, in the oxidation reactor (7), the dioxins are oxidized with oxygen in the exhaust gas at a temperature of about 300° C. in the presence of an oxidation catalyst. Through this oxidation, dioxin becomes IC
/, H20 and C02. Among these decomposition products, HCl is removed together with SOx and the like in the exhaust gas in a downstream wet harmful gas removal device (3). The exhaust gas thus rendered harmless is released into the atmosphere from the chimney (5).
なお、酸化反応器（７）において、酸化触媒を使用しな
い場合にはダイオキシンの酸化分解は通常７００℃以上
の高温を必要とすることが知られている。It is known that in the oxidation reactor (7), when an oxidation catalyst is not used, oxidative decomposition of dioxin usually requires a high temperature of 700° C. or higher.
［発明の効果］
この発明の焼却炉排出ダイオキシンの除去方法によれば
、焼却炉排出ガス中のダイオキシンを酸化触媒の存在下
に３００℃程度の比較的低い温度でＨＣｌ、Ｈ２Ｏおよ
びＣＯ２に効果的に酸化することができる。この分解生
成物のうちＨＣ／は、必要に応じて、排ガス中のＳＯｘ
などと共に後流の湿式有害ガス除で除去することができ
る。こうして焼却炉排出排ガスからダイオキシンを除去
し、同排ガスを完全に無害化することができる。[Effects of the Invention] According to the method for removing dioxin discharged from an incinerator according to the present invention, dioxins in the incinerator exhaust gas can be effectively removed from HCl, H2O, and CO2 at a relatively low temperature of about 300°C in the presence of an oxidation catalyst. can be oxidized to Among these decomposition products, HC/ can be added to SOx in the exhaust gas as necessary.
It can be removed by wet harmful gas removal in the wake. In this way, dioxins can be removed from the exhaust gas discharged from the incinerator, making the exhaust gas completely harmless.
第１図はこの発明の実施例を示す排ガス処理のフローシ
ート、第２図および第３図は従来の排ガス処理のフロー
シートである。
（１）・・・ごみ焼却炉、（２）・・・電気集塵機、（
３）・・・湿式有害ガス除去装置、（４）・・・吸引フ
ァン、（５）・・・煙突、（６）・・・バグフィルタ−
（７）・・・酸化反応器。
以 上FIG. 1 is a flow sheet for exhaust gas treatment showing an embodiment of the present invention, and FIGS. 2 and 3 are flow sheets for conventional exhaust gas treatment. (1)... Garbage incinerator, (2)... Electrostatic precipitator, (
3)... Wet harmful gas removal device, (4)... Suction fan, (5)... Chimney, (6)... Bag filter.
(7)...oxidation reactor. that's all
Claims (1)
て、ＨＣｌ、Ｈ＿２ＯおよびＣＯ＿２に酸化することを
特徴とする焼却炉排出ダイオキシンの除去方法。A method for removing dioxins discharged from an incinerator, which comprises bringing dioxins in the incinerator exhaust gas into contact with an oxidation catalyst to oxidize them into HCl, H_2O and CO_2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1138828A JPH034920A (en) | 1989-05-30 | 1989-05-30 | Removal of dioxin discharged from incinerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1138828A JPH034920A (en) | 1989-05-30 | 1989-05-30 | Removal of dioxin discharged from incinerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH034920A true JPH034920A (en) | 1991-01-10 |
Family
ID=15231174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1138828A Pending JPH034920A (en) | 1989-05-30 | 1989-05-30 | Removal of dioxin discharged from incinerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH034920A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489910A1 (en) * | 1990-06-27 | 1992-06-17 | HASEBE, Nobuyasu | Process for incinerating solid wastes and a process for treating solid wastes and a process for treating gases generated through incineration of these wastes |
| US6027697A (en) * | 1995-08-08 | 2000-02-22 | Ebara Corporation | Method and apparatus for treating combustion exhaust gases |
-
1989
- 1989-05-30 JP JP1138828A patent/JPH034920A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0489910A1 (en) * | 1990-06-27 | 1992-06-17 | HASEBE, Nobuyasu | Process for incinerating solid wastes and a process for treating solid wastes and a process for treating gases generated through incineration of these wastes |
| US6027697A (en) * | 1995-08-08 | 2000-02-22 | Ebara Corporation | Method and apparatus for treating combustion exhaust gases |
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