JP3499131B2 - Dioxin control method in waste treatment system - Google Patents
Dioxin control method in waste treatment systemInfo
- Publication number
- JP3499131B2 JP3499131B2 JP14859398A JP14859398A JP3499131B2 JP 3499131 B2 JP3499131 B2 JP 3499131B2 JP 14859398 A JP14859398 A JP 14859398A JP 14859398 A JP14859398 A JP 14859398A JP 3499131 B2 JP3499131 B2 JP 3499131B2
- Authority
- JP
- Japan
- Prior art keywords
- dust
- exhaust gas
- dioxin
- waste treatment
- treatment system
- 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.)
- Expired - Fee Related
Links
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 suppressing dioxins in a waste treatment system equipped with a thermal decomposition melting furnace for waste, an incinerator, and the like.
【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 in which waste such as municipal waste, sewage sludge and industrial waste is incinerated or melted at high temperature, high temperature exhaust gas containing a large amount of dust (fly ash) is generated. Such exhaust gas passes through a heat exchanger and a waste heat boiler to recover exhaust heat, and finally dust is removed by an exhaust gas treatment device including a bag filter and the like, and the exhaust gas is treated to the atmosphere. Is 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。If chlorine compounds such as vinyl chloride resin are mixed in the waste, harmful dioxin may be generated in the waste treatment furnace or the exhaust gas treatment process. For this reason, in recent pyrolysis and melting furnaces, waste is melted at a high temperature at which dioxin generated is pyrolyzed. Also, in the exhaust gas treatment process, the exhaust gas temperature is designed to be kept high in order to avoid the temperature range where dioxin is generated. Therefore, dioxins are hardly generated 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 the high-temperature exhaust gas passes through the heat exchanger and the waste heat boiler, it is inevitable that dust is separated from the exhaust gas and accumulated. It is provided. The dust accumulated in the dust pool is regularly taken out to the outside through a dust chute and a rotary valve in order to prevent clogging. At this time, the high temperature dust is gradually cooled, and dioxin may be generated. It is kept in the temperature range of 300 to 500 ° C for a long time. Further, when the exhaust gas flow comes into contact with the dust in such a temperature range, the dioxin-producing substance in the exhaust gas is further adsorbed by the dust, which causes the re-synthesis of dioxin. Therefore, conventionally, there is a possibility that dioxin is re-synthesized at the portion where the dust accumulated in the dust reservoir 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。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a method for suppressing dioxin in a waste treatment system capable of effectively preventing re-synthesis of dioxin in a portion for taking out dust accumulated in a dust reservoir. 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をその外面に設けた水冷ジャケ
ットにより冷却するとともに、ロータリーバルブをその
羽根に設けた中空の水冷構造により水冷することによ
り、５００℃〜１５０℃の温度域を１０分以内に通過す
るように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。The present invention, which has been made to solve the above-mentioned problems, provides a dust chute for extracting high-temperature dust in exhaust gas generated from a waste treatment furnace to the outside from a dust reservoir. Water-cooled jacket on the outside
To cool by Tsu preparative, the rotary valve
By cooling with water by the hollow water-cooling structure provided on the blade, the temperature range of 500 ° C to 150 ° C is passed within 10 minutes.
It is characterized in that it is taken out to the outside while being rapidly cooled. In addition, it is preferable to provide a dust reservoir at a position away from the exhaust gas flow 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、
５００℃〜１５０℃のダイオキシンの発生温度域を１０
分以内に通過するよう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,
Dioxin generation temperature range of 500 ℃ ~ 150 ℃ 10
The dioxin re-synthesis in this portion can be suppressed because the dioxin is rapidly passed so that it can be passed within a minute and taken out to the outside.
【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。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
In FIG. 1, 1 is a waste treatment furnace such as a pyrolysis melting furnace or an incinerator, which melts various wastes such as municipal waste, sewage sludge, and industrial waste at a high temperature of 1000 ° C. or higher at which dioxin decomposes. The process of incineration is performed. At this time, high-temperature exhaust gas containing dust (fly ash) is generated as described above. This exhaust gas is guided to the waste heat boiler 2 and the heat exchanger shown in FIG. 1 and, after recovering a part of the exhaust heat, dust is removed and exhaust gas is processed by the exhaust gas processing device 3 and is discharged into the atmosphere from the chimney. To be done. The waste treatment furnace 1 and the pipeline for guiding the exhaust gas to the exhaust gas treatment apparatus 3 are maintained at a high temperature of 500 ° C. or higher at which dioxin is not likely to be generated.
【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, since the cross-sectional area of the exhaust gas passage is enlarged, the exhaust gas flow 5
It is unavoidable that the flow velocity of the exhaust gas decreases and the dust in the exhaust gas separates and accumulates 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 where dioxin is generated. However, the temperature of the dust is gradually lowered by the time it is taken out through the dust chute 6 and the rotary valve 7, and the temperature is maintained in the temperature range of 300 to 500 ° C. where dioxin may be generated. When in contact with, 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 reservoir 4 is rapidly cooled by flowing cooling water. The blades 9 of the rotary valve 7 also have a hollow water cooling structure to enhance the dust cooling effect. This cooling is preferably performed rapidly at a rate at which the accumulated high-temperature dust passes through the temperature range of 500 ° C. to 150 ° C. within 10 minutes. By thus passing the dioxin generation temperature range in a short time, the re-synthesis 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 in which water cooling is not performed.
【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 a dust reservoir 4 is provided at a position apart from the exhaust gas flow 5 so as to prevent contact between the accumulated dust and the exhaust gas flow 5 as much as possible, the temperature range of dioxin generation. It is possible to more reliably suppress the re-synthesis of dioxin due to the contact between the dust existing in and the exhaust gas stream 5.
【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 and melting furnace, the dust thus extracted from the rotary valve 7 to the outside together with the dust extracted from the exhaust gas treatment device 3 It can be recharged and melted. Further, when the waste treatment furnace 1 is an incinerator, ordinary solidification treatment 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 dioxin generation temperature range by water cooling the dust chute and the rotary valve for taking out high temperature dust from the dust reservoir to the outside. This has the advantage of shortening the heating time and suppressing the re-synthesis of dioxin in the dust extraction part.
【図１】本発明の実施形態を示す断面図である。FIG. 1 is a cross-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1 waste treatment furnace, 2 waste heat boiler, 3 exhaust gas treatment device, 4 dust collection, 5 exhaust gas flow, 6 dust chute, 7 rotary valve, 8 water cooling jacket, 9
Rotary valve blade
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−34121（ＪＰ，Ａ) 特開 平６−2813（ＪＰ，Ａ) 特開 平４−371714（ＪＰ，Ａ) 特開 平５−293322（ＪＰ，Ａ) 特開 平８−5036（ＪＰ，Ａ) 登録実用新案3015544（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F23J 15/06 F23G 5/44 F23J 3/06 ─────────────────────────────────────────────────── --- Continuation of front page (56) References JP-A-6-34121 (JP, A) JP-A-6-2813 (JP, A) JP-A-4-371714 (JP, A) JP-A-5- 293322 (JP, A) JP-A-8-5036 (JP, A) Registered utility model 3015544 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) F23J 15/06 F23G 5/44 F23J 3/06
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
ダストシュートをその外面に設けた水冷ジャケットによ
り冷却するとともに、ロータリーバルブをその羽根に設
けた中空の水冷構造により水冷することにより、５００
℃〜１５０℃の温度域を１０分以内に通過するように急
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 water cooling jacket having a dust chute on its outer surface for taking out high temperature dust in exhaust gas generated from a waste treatment furnace from a dust reservoir to the outside .
And then install a rotary valve on the blade.
By water cooling with a hollow hollow water cooling structure , 500
A method for suppressing dioxin in a waste treatment system, characterized in that the dioxin is taken out to the outside while being rapidly cooled so as to pass through a temperature range of 150 to 150 ° C within 10 minutes .
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 method for suppressing dioxins in a waste treatment system according to claim 1, wherein a dust reservoir is provided at a position apart 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 JPH11337046A (en) | 1999-12-10 |
| JP3499131B2 true 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) |
Citations (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
Patent Citations (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11337046A (en) | 1999-12-10 |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| LAPS | Cancellation because of no payment of annual fees |