JPH05161822A - Reduction of dioxines - Google Patents
Reduction of dioxinesInfo
- Publication number
- JPH05161822A JPH05161822A JP3330201A JP33020191A JPH05161822A JP H05161822 A JPH05161822 A JP H05161822A JP 3330201 A JP3330201 A JP 3330201A JP 33020191 A JP33020191 A JP 33020191A JP H05161822 A JPH05161822 A JP H05161822A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- gas
- filter
- dioxines
- 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
Landscapes
- Chimneys And Flues (AREA)
- Incineration Of Waste (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、都市ごみ、産業廃棄物
などの焼却ないしその排ガス処理に伴って発生したダイ
オキシン類がそのまま系外へ放散しないように、これを
未然に低減化ないしは除去する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reduces or removes dioxins generated by incineration of municipal solid waste, industrial waste, etc. or the exhaust gas treatment thereof so as not to be released to the outside of the system. Regarding the method.
【０００２】[0002]
【従来の技術】ごみ焼却炉などから排出されるダイオキ
シン類はその生成過程に不明な点が多いが、主として、
ごみ中の有機物とポリ塩化ビニル系のプラスチックによ
り発生すると考えられている。2. Description of the Related Art Dioxins discharged from refuse incinerators, etc. have many unclear points in their production process.
It is considered to be generated by organic substances in waste and polyvinyl chloride plastics.
【０００３】排ガス中および飛灰中のダイオキシン類の
低減化ないしは除去策としては、現在、低温（２００℃
程度）で排ガスをバグフィルターに通す方法の研究開発
が行なわれている。As a measure for reducing or removing dioxins in exhaust gas and fly ash, a low temperature (200 ° C.) is currently used.
Research and development of a method of passing exhaust gas through a bag filter.
【０００４】[0004]
【発明が解決しようとする課題】しかし、バグフィルタ
ーを用いた方法ではダイオキシン類は飛灰中で捕捉され
るので、次に飛灰中のダイオキシン類の無害化処理が必
要となる。However, in the method using the bag filter, dioxins are captured in the fly ash, so that it is necessary to detoxify the dioxin in the fly ash.
【０００５】本発明は、このような点に鑑み、排ガス中
および飛灰中のダイオキシン類を同時に低減できる方法
を提供することを目的とする。In view of the above points, an object of the present invention is to provide a method capable of simultaneously reducing dioxins in exhaust gas and fly ash.
【０００６】[0006]
【課題を解決するための手段】本発明によるダイオキシ
ン類の低減化方法は、焼却炉から排出された排ガスに６
００℃〜３００℃の温度範囲でＮＨ3 ガスまたは尿素を
添加した後、同排ガスを耐熱性フィルターに通し、排ガ
ス中および飛灰中のダイオキシン類を分解することを特
徴とするものである。A method for reducing dioxins according to the present invention is applied to exhaust gas discharged from an incinerator.
After adding NH 3 gas or urea in the temperature range of 00 ° C to 300 ° C, the exhaust gas is passed through a heat resistant filter to decompose dioxins in the exhaust gas and fly ash.
【０００７】ダイオキシン類を含む排ガスにＮＨ3 ガス
または尿素を添加するときの排ガスの温度は、６００℃
〜３００℃の範囲である必要がある。排ガス温度が６０
０℃以上の高温になると、飛灰の固結が生じ、そのため
後流のフィルターが目詰まりをきたし、連続運転が困難
となる。また、排ガス温度が３００℃以下ではダイオキ
シン類の還元反応が進行しにくい。４５０℃以上ではＮ
Ｈ3 の一部が酸化されるため供給したＮＨ3 の反応効率
が低下することがあり、３５０℃以下ではダイオキシン
類の還元反応速度がやや低下するきらいがあるので、４
５０℃〜３５０℃の温度範囲が最も好ましい。The temperature of the exhaust gas when NH 3 gas or urea is added to the exhaust gas containing dioxins is 600 ° C.
It must be in the range of ~ 300 ° C. Exhaust gas temperature is 60
At a high temperature of 0 ° C. or higher, fly ash is solidified, which causes clogging of the downstream filter and makes continuous operation difficult. Further, when the exhaust gas temperature is 300 ° C. or lower, the reduction reaction of dioxins is difficult to proceed. N above 450 ° C
The reaction efficiency of the supplied NH 3 may decrease because a part of H 3 is oxidized, and the reduction reaction rate of dioxins may be slightly decreased at 350 ° C. or lower.
Most preferred is a temperature range of 50 ° C to 350 ° C.
【０００８】排ガスに添加されたＮＨ3 ガスは還元剤と
して働き、尿素は熱分解によりＮＨ3 ガスを発生する。
ＮＨ3 ガスまたは尿素の添加量は、排ガス中のダイオキ
シン類の含有量にもよるが、たとえばＮＨ3 ガスでは９
５０ｐｐｍ〜１０００ｐｐｍ程度である。The NH 3 gas added to the exhaust gas acts as a reducing agent, and urea is thermally decomposed to generate NH 3 gas.
The addition amount of NH 3 gas or urea depends on the content of dioxins in the exhaust gas, but is 9 for NH 3 gas, for example.
It is about 50 ppm to 1000 ppm.
【０００９】耐熱性フィルターの代表例はセラミックフ
ィルターである。ダイオキシン類を含有した飛灰は耐熱
性フィルターの表面に約２時間程度滞留し、その間にダ
イオキシン類はＮＨ3 ガスと接触して脱塩素化反応によ
り還元される。耐熱性フィルターはこの反応の触媒とし
て作用する。こうしてダイオキシン類の還元により生じ
た無害化物質は系外へ排出される。A typical example of the heat resistant filter is a ceramic filter. The fly ash containing dioxins stays on the surface of the heat resistant filter for about 2 hours, during which the dioxins are contacted with NH 3 gas and reduced by the dechlorination reaction. The heat resistant filter acts as a catalyst for this reaction. In this way, the detoxifying substances generated by the reduction of dioxins are discharged out of the system.
【００１０】[0010]
【実施例】本発明によるダイオキシン類の低減化方法の
フローを図１に示す。EXAMPLE The flow of the method for reducing dioxins according to the present invention is shown in FIG.
【００１１】同図において、ごみ焼却炉(1) の頂部出口
から排出された排ガスは調温塔(2)を経た後、温度４５
０℃〜３５０℃で排ガス排出路(3) を通過する。排ガス
排出路(3) において排ガスにＮＨ3ガス（または尿素）
が吹込まれる。ＮＨ3 ガスの吹込み量は、９５０ｐｐｍ
〜１０００ｐｐｍ程度である。また、排ガス中のＯ2 濃
度は８〜９容積％である。In the figure, the exhaust gas discharged from the top outlet of the refuse incinerator (1) passes through the temperature control tower (2) and then reaches a temperature of 45
Pass through the exhaust gas discharge channel (3) at 0 ° C to 350 ° C. NH 3 gas (or urea) in the exhaust gas in the exhaust gas discharge path (3)
Is blown in. The blowing amount of NH 3 gas is 950ppm
It is about 1000 ppm. Further, the O 2 concentration in the exhaust gas is 8 to 9% by volume.
【００１２】ついで、ＮＨ3 含有排ガスは排ガス排出路
(3) の直後に設けられた集塵機(4)に送られ、集塵機(4)
内に設けられたセラミックフィルターよりなる耐熱性
フィルター(5) に通される。Next, the NH 3 -containing exhaust gas is discharged into the exhaust gas discharge passage.
It is sent to the dust collector (4) installed immediately after (3), and the dust collector (4)
It is passed through a heat resistant filter (5) made of a ceramic filter provided inside.
【００１３】排ガス中に含まれていた飛灰はこのフィル
ター(5) の表面に約２時間程度滞留し、その間に排ガス
中のダイオキシン類はＮＨ3 ガスと接触して脱塩素化反
応により還元される。ついで排ガスは有害ガス除去装置
(6) へ送られ、ＨＣｌ、ＳＯｘ、Ｈｇなどの除去後、煙
突(7) から大気中へ放散される。Fly ash contained in the exhaust gas stays on the surface of the filter (5) for about 2 hours, during which dioxins in the exhaust gas are contacted with NH 3 gas and reduced by a dechlorination reaction. It Next, exhaust gas is a harmful gas removal device
It is sent to (6), and after removing HCl, SOx, Hg, etc., it is released from the chimney (7) into the atmosphere.
【００１４】耐熱性フィルター(5) に付着した灰分は、
その後除去される。図２に温度とダイオキシン低減率の
関係を示す。同図より３５０℃〜４５０℃の温度範囲に
おいてダイオキシン低減効果が格段に大きいことがわか
る。The ash attached to the heat resistant filter (5) is
It is then removed. FIG. 2 shows the relationship between the temperature and the dioxin reduction rate. From the figure, it can be seen that the dioxin reduction effect is remarkably large in the temperature range of 350 ° C to 450 ° C.
【００１５】[0015]
【発明の効果】本発明によるダイオキシン類の低減化方
法では、焼却炉から排出された排ガスに６００℃〜３０
０℃の温度範囲でＮＨ3 ガスまたは尿素を添加した後、
同排ガスを耐熱性フィルターに通すので、排ガスに添加
されたＮＨ3 ガスは還元剤として働き、尿素は熱分解に
よりＮＨ3 ガスを発生し、耐熱性フィルターは還元触媒
として働く。その結果、ダイオキシン類を含有した飛灰
は耐熱性フィルターの表面に滞留し、その間にダイオキ
シン類はＮＨ3 ガスと接触して脱塩素化反応により還元
される。こうして排ガス中および飛灰中のダイオキシン
類が同時に還元無害化せられる。In the method for reducing dioxins according to the present invention, the exhaust gas discharged from the incinerator has a temperature of 600 ° C to 30 ° C.
After adding NH 3 gas or urea in the temperature range of 0 ° C.,
Since the exhaust gas is passed through the heat resistant filter, NH 3 gas added to the exhaust gas acts as a reducing agent, urea generates NH 3 gas by thermal decomposition, and the heat resistant filter acts as a reduction catalyst. As a result, the fly ash containing dioxins stays on the surface of the heat resistant filter, during which the dioxins come into contact with NH 3 gas and are reduced by the dechlorination reaction. In this way, dioxins in the exhaust gas and fly ash are simultaneously reduced and rendered harmless.
【図１】本発明によるダイオキシン類の低減化方法を示
すフローシートである。FIG. 1 is a flow sheet showing a method for reducing dioxins according to the present invention.
【図２】温度とダイオキシン低減率の関係を示すグラフ
である。FIG. 2 is a graph showing the relationship between temperature and dioxin reduction rate.
(1) …ごみ焼却炉 (2) …調温塔 (3) …排ガス排出路 (4) …集塵機 (5) …耐熱性フィルター (6) …有害ガス除去装置 (7) …煙突 (1)… Garbage incinerator (2)… Temperature control tower (3)… Exhaust gas discharge path (4)… Dust collector (5)… Heat resistant filter (6)… Hazardous gas removal device (7)… Chimney
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河野 正 大阪市此花区西九条５丁目３番28号 日立 造船株式会社内 (72)発明者 三浦 祥正 大阪市此花区西九条５丁目３番28号 日立 造船株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tadashi Kono 5-3-8 Nishi-Kujo, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd. (72) Yoshimasa Miura 5-28-3, Nishi Kujo, Konohana-ku, Osaka Issue Hitachi Shipbuilding Co., Ltd.
Claims (1)
〜３００℃の温度範囲でＮＨ3 ガスまたは尿素を添加し
た後、同排ガスを耐熱性フィルターに通し、排ガス中お
よび飛灰中のダイオキシン類を分解することを特徴とす
るダイオキシン類の低減化方法。1. The exhaust gas discharged from the incinerator has a temperature of 600 ° C.
A method for reducing dioxins, which comprises adding NH 3 gas or urea in a temperature range of up to 300 ° C., and then passing the exhaust gas through a heat resistant filter to decompose dioxins in the exhaust gas and fly ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3330201A JPH05161822A (en) | 1991-12-13 | 1991-12-13 | Reduction of dioxines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3330201A JPH05161822A (en) | 1991-12-13 | 1991-12-13 | Reduction of dioxines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05161822A true JPH05161822A (en) | 1993-06-29 |
Family
ID=18229970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3330201A Pending JPH05161822A (en) | 1991-12-13 | 1991-12-13 | Reduction of dioxines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05161822A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998033607A1 (en) * | 1997-01-30 | 1998-08-06 | Kurita Water Industries Ltd. | Method of decomposing dioxins |
| US6065409A (en) * | 1995-06-30 | 2000-05-23 | Gec Alsthom Stein Industrie | Method of hot scrubbing flue gases, in particular for an incineration plant for household refuse |
| KR20020025530A (en) * | 2000-09-29 | 2002-04-04 | 홍민선 | Apparatus for the simultaneous removal of particulates and hydrogen chloride using catalysts doped fibrous ceramic filters |
| JP2002102650A (en) * | 2000-09-27 | 2002-04-09 | Miyoshi Oil & Fat Co Ltd | Pretreatment method for flue gas |
| JP2006347781A (en) * | 2005-06-13 | 2006-12-28 | Ube Ind Ltd | Method for suppressing generation of organic chlorine compound and method for manufacturing cement |
-
1991
- 1991-12-13 JP JP3330201A patent/JPH05161822A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6065409A (en) * | 1995-06-30 | 2000-05-23 | Gec Alsthom Stein Industrie | Method of hot scrubbing flue gases, in particular for an incineration plant for household refuse |
| WO1998033607A1 (en) * | 1997-01-30 | 1998-08-06 | Kurita Water Industries Ltd. | Method of decomposing dioxins |
| US6063979A (en) * | 1997-01-30 | 2000-05-16 | Kurita Water Industries Ltd. | Method of decomposing dioxins |
| JP2002102650A (en) * | 2000-09-27 | 2002-04-09 | Miyoshi Oil & Fat Co Ltd | Pretreatment method for flue gas |
| KR20020025530A (en) * | 2000-09-29 | 2002-04-04 | 홍민선 | Apparatus for the simultaneous removal of particulates and hydrogen chloride using catalysts doped fibrous ceramic filters |
| JP2006347781A (en) * | 2005-06-13 | 2006-12-28 | Ube Ind Ltd | Method for suppressing generation of organic chlorine compound and method for manufacturing cement |
| JP4701847B2 (en) * | 2005-06-13 | 2011-06-15 | 宇部興産株式会社 | Method for inhibiting formation of organochlorine compound and method for producing cement |
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