JPH11337046A - Dioxin restraining method in wastes treatment system - Google Patents
Dioxin restraining method in wastes treatment systemInfo
- Publication number
- JPH11337046A JPH11337046A JP10148593A JP14859398A JPH11337046A JP H11337046 A JPH11337046 A JP H11337046A JP 10148593 A JP10148593 A JP 10148593A JP 14859398 A JP14859398 A JP 14859398A JP H11337046 A JPH11337046 A JP H11337046A
- Authority
- JP
- Japan
- Prior art keywords
- dust
- dioxin
- exhaust gas
- treatment system
- generated
- 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
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、廃棄物の熱分解溶
融炉や焼却炉等を備えた廃棄物処理システムにおけるダ
イオキシン抑制方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling dioxin in a waste treatment system provided with a furnace for pyrolysis and melting of waste and an incinerator.
【０００２】[0002]
【従来の技術】都市ごみ、下水汚泥、産業廃棄物等の廃
棄物を高温で焼却したり溶融する廃棄物処理システムに
おいては、多量のダスト（飛灰）を含む高温の排ガスが
発生する。このような排ガスは熱交換器や廃熱ボイラを
通過して排熱を回収されたうえ、最終的にはバグフィル
タ等を含む排ガス処理装置によりダストを取り除かれる
とともに、排ガス処理されて大気中に放出される。2. Description of the Related Art In a waste treatment system that incinerates or melts waste such as municipal solid waste, sewage sludge, and industrial waste at a high temperature, high-temperature exhaust gas containing a large amount of dust (fly ash) is generated. Such exhaust gas passes through a heat exchanger or a waste heat boiler to recover exhaust heat.Finally, the dust is removed by an exhaust gas treatment device including a bag filter, etc. Released.
【０００３】ところで、廃棄物中に塩化ビニル樹脂など
の塩素化合物が混入していると、廃棄物処理炉や排ガス
処理工程で有害なダイオキシンが発生するおそれがあ
る。このため、最近の熱分解溶融炉等では発生したダイ
オキシンが熱分解してしまうような高温で廃棄物の溶融
を行っている。また排ガス処理工程においてもダイオキ
シンの発生温度域を避けるために、排ガス温度を高温に
保つように工夫されている。従って、これらのメインル
ート中ではダイオキシンの発生はほとんどない。[0003] If chlorine compounds such as vinyl chloride resin are mixed in the waste, harmful dioxins may be generated in a waste treatment furnace or an exhaust gas treatment process. For this reason, in recent thermal decomposition melting furnaces and the like, wastes are melted at such a high temperature that dioxin generated is thermally decomposed. Also, in the exhaust gas treatment step, in order to avoid the temperature range where dioxins are generated, the temperature of the exhaust gas is kept high. Therefore, there is almost no generation of dioxin in these main routes.
【０００４】しかし、高温の排ガスが上記の熱交換器や
廃熱ボイラを通過する際に、排ガス中からダストが分離
して堆積することは避けられず、そのような場所には予
めダスト溜まりを設けてある。このダスト溜まりに堆積
したダストは、閉塞防止のためにダストシュート及びロ
ータリーバルブを介して定期的に外部に取り出される
が、この際に高温のダストは徐々に冷却され、ダイオキ
シンが発生するおそれのある３００〜５００℃の温度域
に長時間保持される。またそのような温度域にあるダス
トに排ガス流が接すると、排ガス中のダイオキシン生成
物質が更にダストに吸着され、ダイオキシンの再合成を
招く。従って、従来はダスト溜まりに堆積したダストを
外部に取り出す部分でダイオキシンが再合成されるおそ
れがあった。However, when high-temperature exhaust gas passes through the above-mentioned heat exchanger or waste heat boiler, it is inevitable that dust separates and accumulates from the exhaust gas, and in such a place, a dust pool is previously stored. It is provided. The dust accumulated in the dust reservoir is periodically taken out via a dust chute and a rotary valve to prevent clogging. At this time, the high-temperature dust is gradually cooled, and there is a possibility that dioxin may be generated. It is kept for a long time in the temperature range of 300 to 500 ° C. Further, when the exhaust gas stream comes into contact with the dust in such a temperature range, the dioxin-forming substance in the exhaust gas is further adsorbed by the dust, which causes the resynthesis of dioxin. Therefore, conventionally, there is a possibility that dioxin may be resynthesized at a portion where the dust accumulated in the dust pool is taken out.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、ダスト溜まりに堆積したダストの取
り出し部分におけるダイオキシンの再合成を効果的に防
止できる廃棄物処理システムにおけるダイオキシン抑制
方法を提供するためになされたものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a method for controlling dioxin in a waste treatment system capable of effectively preventing re-synthesis of dioxin in a portion where dust accumulated in a dust reservoir is taken out. It was made to provide.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、廃棄物処理炉から発生した排ガ
ス中の高温のダストを、ダスト溜まりから外部に取り出
すためのダストシュート及びロータリーバルブを水冷す
ることにより、ダストを急冷しつつ外部に取り出すこと
を特徴とするものである。なお、ダスト溜まりを排ガス
流から外れた位置に設け、ダストと排ガスとの接触を防
止するようにしておくことが好ましい。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a dust chute and a rotary for taking out high-temperature dust in exhaust gas generated from a waste treatment furnace from a dust pool. By cooling the valve with water, the dust is rapidly cooled and taken out to the outside. It is preferable that the dust reservoir is provided at a position deviated from the exhaust gas flow so as to prevent contact between the dust and the exhaust gas.
【０００７】本発明によれば、ダストシュート及びロー
タリーバルブを水冷することによりダストを急冷し、ダ
イオキシンの発生温度域を急速に通過させて外部に取り
出すようにしたので、この部分におけるダイオキシンの
再合成を抑制することができる。According to the present invention, the dust is rapidly cooled by water-cooling the dust chute and the rotary valve, and the dust is rapidly passed through the temperature range where dioxin is generated, so that dioxin is resynthesized in this portion. Can be suppressed.
【０００８】[0008]
【発明の実施の形態】以下に本発明の実施形態を示す。
図１において、１は熱分解溶融炉、焼却炉等の廃棄物処
理炉であり、都市ごみや下水汚泥、産業廃棄物等の各種
廃棄物をダイオキシンが分解する１０００℃以上の高温
で溶融したり焼却する処理が行われる。この際、前記し
たようにダスト（飛灰）を含む高温の排ガスが発生す
る。この排ガスは図１に示される廃熱ボイラ２や熱交換
器に導かれ、排熱の一部を回収されたうえで排ガス処理
装置３でダストの除去及び排ガス処理され、煙突から大
気中に放出される。廃棄物処理炉１及び排ガスを排ガス
処理装置３まで導く管路中は、ダイオキシンが発生する
おそれのない５００℃以上の高温に維持されている。Embodiments of the present invention will be described below.
In FIG. 1, reference numeral 1 denotes a waste treatment furnace such as a pyrolysis melting furnace or an incinerator, which melts various kinds of waste such as municipal waste, sewage sludge, and industrial waste at a high temperature of 1000 ° C. or more at which dioxin is decomposed. An incineration process is performed. At this time, high-temperature exhaust gas containing dust (fly ash) is generated as described above. This exhaust gas is guided to a waste heat boiler 2 and a heat exchanger shown in FIG. 1, and after a part of the exhaust heat is recovered, is subjected to dust removal and exhaust gas treatment by an exhaust gas treatment device 3 and is discharged from a chimney to the atmosphere. Is done. The waste treatment furnace 1 and the conduit for guiding the exhaust gas to the exhaust gas treatment device 3 are maintained at a high temperature of 500 ° C. or higher where there is no possibility of generating dioxin.
【０００９】さて前記したように、廃棄物処理炉１と排
ガス処理装置３との間に設けられた廃熱ボイラ２等にお
いては、排ガス流路の断面積が拡大するため排ガス流５
の流速が低下し、排ガス中のダストが分離して下部のダ
スト溜まり４内に堆積することが避けられない。このダ
ストは排ガス流５から分離された直後はダイオキシンの
発生温度域をはるかに越える高温である。しかし、ダス
トシュート６及びロータリーバルブ７を通過して取り出
されるまでに徐々にダスト温度が低下してダイオキシン
が発生するおそれのある３００〜５００℃の温度域に維
持され、その間にダストと排ガス流５とが接触するとダ
イオキシンが再合成されることがある。As described above, in the waste heat boiler 2 and the like provided between the waste treatment furnace 1 and the exhaust gas treatment device 3, the exhaust gas flow
, The dust in the exhaust gas is inevitably separated and deposited in the lower dust reservoir 4. Immediately after being separated from the exhaust gas stream 5, this dust has a high temperature far exceeding the temperature range in which dioxin is generated. However, the temperature of the dust is maintained at a temperature in the range of 300 to 500 ° C. where dioxin may be generated due to a gradual decrease in dust temperature before being taken out through the dust chute 6 and the rotary valve 7. When contacted with dioxin, dioxin may be resynthesized.
【００１０】そこで本発明では、ダストシュート６の外
面全体に水冷ジャケット８を設け、冷却水を流すことに
よってダスト溜まり４内のダストを急冷する。またロー
タリーバルブ７の羽根９も中空の水冷構造とし、ダスト
の冷却効果を高める。この冷却は、堆積した高温のダス
トが５００℃から１５０℃までの温度域を１０分以内に
通過する速度で急速に行うことが好ましい。このように
してダイオキシンの発生温度域を短時間で通過させれ
ば、ダイオキシンの再合成を抑制することができる。本
発明の方法によれば、ロータリーバルブ７から外部に取
り出されるダスト中のダイオキシン含有量を、水冷を行
わない従来法に比べ、１０％以下にまで減少させること
ができた。Therefore, in the present invention, a water cooling jacket 8 is provided on the entire outer surface of the dust chute 6, and the dust in the dust pool 4 is rapidly cooled by flowing cooling water. The blades 9 of the rotary valve 7 also have a hollow water-cooled structure to enhance the dust cooling effect. This cooling is preferably performed rapidly at a rate at which the deposited high-temperature dust passes through a temperature range from 500 ° C. to 150 ° C. within 10 minutes. In this way, by allowing the dioxin to pass through the temperature range for generating dioxin in a short time, resynthesis of dioxin can be suppressed. According to the method of the present invention, the dioxin content in the dust taken out from the rotary valve 7 can be reduced to 10% or less as compared with the conventional method without water cooling.
【００１１】また図１に示すように、ダスト溜まり４を
排ガス流５から外れた位置に設け、堆積したダストと排
ガス流５との接触をできるだけ防止するようにしておけ
ば、ダイオキシンの発生温度域にあるダストと排ガス流
５の接触によるダイオキシンの再合成をより確実に抑制
することができる。Further, as shown in FIG. 1, if the dust reservoir 4 is provided at a position deviated from the exhaust gas flow 5 so that the contact between the accumulated dust and the exhaust gas flow 5 is prevented as much as possible, the temperature range where dioxin is generated can be obtained. The resynthesis of dioxin due to the contact between the dust and the exhaust gas stream 5 can be more reliably suppressed.
【００１２】廃棄物処理炉１が熱分解溶融炉である場合
には、このようにしてロータリーバルブ７から外部に取
り出されたダストは、排ガス処理装置３から取り出され
たダストとともに廃棄物処理炉１に再投入し、溶融する
ことができる。また廃棄物処理炉１が焼却炉である場合
には、通常の固化処理を行えばよい。When the waste treatment furnace 1 is a pyrolysis melting furnace, the dust thus taken out from the rotary valve 7 together with the dust taken out from the exhaust gas treatment device 3 is combined with the waste treatment furnace 1. To be melted again. When the waste treatment furnace 1 is an incinerator, normal solidification processing may be performed.
【００１３】[0013]
【発明の効果】以上に説明したように、本発明によれ
ば、高温のダストをダスト溜まりから外部に取り出すた
めのダストシュート及びロータリーバルブを水冷するこ
とにより、ダストがダイオキシンの発生温度域を通過す
る時間を短縮し、ダスト取り出し部分におけるダイオキ
シンの再合成を抑制できる利点がある。As described above, according to the present invention, the dust passes through the temperature range where dioxin is generated by cooling the dust chute and rotary valve for taking out high-temperature dust from the dust pool to the outside. There is an advantage that the time required for the removal of dioxin in the dust extraction portion can be suppressed.
【図１】本発明の実施形態を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the present invention.
１ 廃棄物処理炉、２ 廃熱ボイラ、３ 排ガス処理装
置、４ ダスト溜まり、５ 排ガス流、６ ダストシュ
ート、７ ロータリーバルブ、８ 水冷ジャケット、９
ロータリーバルブの羽根Reference Signs List 1 waste treatment furnace, 2 waste heat boiler, 3 exhaust gas treatment device, 4 dust reservoir, 5 exhaust gas flow, 6 dust chute, 7 rotary valve, 8 water cooling jacket, 9
Rotary valve blade
Claims (2)
温のダストを、ダスト溜まりから外部に取り出すための
ダストシュート及びロータリーバルブを水冷することに
より、ダストを急冷しつつ外部に取り出すことを特徴と
する廃棄物処理システムにおけるダイオキシン抑制方
法。1. A dust chute and a rotary valve for taking out high-temperature dust in an exhaust gas generated from a waste treatment furnace from a dust reservoir to the outside, and taking out the dust to the outside while rapidly cooling the dust. Dioxin control method in waste treatment system.
に設け、ダストと排ガスとの接触を防止するようにした
請求項１に記載の廃棄物処理システムにおけるダイオキ
シン抑制方法。2. The dioxin control method in a waste treatment system according to claim 1, wherein the dust reservoir is provided at a position deviating from the exhaust gas flow to prevent contact between the dust and the exhaust gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14859398A JP3499131B2 (en) | 1998-05-29 | 1998-05-29 | Dioxin control method in waste treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14859398A JP3499131B2 (en) | 1998-05-29 | 1998-05-29 | Dioxin control method in waste treatment system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11337046A true JPH11337046A (en) | 1999-12-10 |
| JP3499131B2 JP3499131B2 (en) | 2004-02-23 |
Family
ID=15456232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14859398A Expired - Fee Related JP3499131B2 (en) | 1998-05-29 | 1998-05-29 | Dioxin control method in waste treatment system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3499131B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3015544U (en) | 1995-03-07 | 1995-09-05 | 株式会社山崎鉄工所 | Water-cooled rotary valve |
-
1998
- 1998-05-29 JP JP14859398A patent/JP3499131B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3499131B2 (en) | 2004-02-23 |
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