JPH05123520A - Removal of dust from combustion exhaust gas - Google Patents

Removal of dust from combustion exhaust gas

Info

Publication number
JPH05123520A
JPH05123520A JP23966291A JP23966291A JPH05123520A JP H05123520 A JPH05123520 A JP H05123520A JP 23966291 A JP23966291 A JP 23966291A JP 23966291 A JP23966291 A JP 23966291A JP H05123520 A JPH05123520 A JP H05123520A
Authority
JP
Japan
Prior art keywords
dust
exhaust gas
filter
filter medium
combustion exhaust
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
Application number
JP23966291A
Other languages
Japanese (ja)
Inventor
Hitoshi Wakui
均 和久井
Fuyuhiko Ishikawa
冬比古 石川
Akitoshi Sunaga
章敏 須永
Kazuo Eto
和夫 衛藤
Hitoshi Miyazaki
仁 宮崎
Original Assignee
Chiyoda Corp
千代田化工建設株式会社
Power Reactor & Nuclear Fuel Dev Corp
動力炉・核燃料開発事業団
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chiyoda Corp, 千代田化工建設株式会社, Power Reactor & Nuclear Fuel Dev Corp, 動力炉・核燃料開発事業団 filed Critical Chiyoda Corp
Priority to JP23966291A priority Critical patent/JPH05123520A/en
Publication of JPH05123520A publication Critical patent/JPH05123520A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To remove dust from a large amount of exhaust gas in a high removing rate and to easily regenerate a filter material by passing combustion exhaust gas with a dust concn. of a specific value or less through a synthetic resin treated fibrous filter material capable of being regenerated by the washing with water, an acidic solution or an alkaline solution and drying to collect dust. CONSTITUTION:Combustion exhaust gas with a dust concn. of 200mg/Nm<3> or less is passed through a synthetic resin treated fibrous filter material capable of being regenerated by the washing with water, an acidic solution or an alkaline solution and drying to collect dust. As a result, dust can be removed from a large amount of combustion exhaust gas in a high removing rate and the filter material can easily be regenerated.

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【産業上の利用分野】本発明は燃焼排ガスからダスト等
を除去する方法に関し、より詳細にはダスト等、たとえ
ば放射性物質のような有害物質の濃度を約1mg/Nm3
下に低下させることができる燃焼排ガス中のダスト等を
除去する方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing dust and the like from combustion exhaust gas, and more particularly to reducing the concentration of dust and other harmful substances such as radioactive substances to about 1 mg / Nm 3 or less. The present invention relates to a method for removing dust and the like in combustion exhaust gas that can be obtained.
【0002】[0002]
【従来の技術】ボイラー、焼却炉などから発生する燃焼
排ガス (以下、排ガスと略記) からダスト等を除去する
方法としては、スクラバーにより除去する湿式法、バグ
フィルターや電気集塵機などを用いる乾式法が知られて
いる。しかしながら合成樹脂やゴム等の難燃物を燃焼処
理すると、多量の酸・アルカリミストや芒硝のような潮
解性のある粘着性ダストが発生し、これらのダスト等を
上記従来の湿式法や乾式法で高い排ガス処理能力と除塵
率を維持しながら除去することは困難であった。
2. Description of the Related Art As a method for removing dust and the like from combustion exhaust gas (hereinafter abbreviated as exhaust gas) generated from a boiler, an incinerator, etc., there are a wet method of removing with a scrubber, a dry method of using a bag filter, an electrostatic precipitator, etc. Are known. However, when flame-retardant materials such as synthetic resins and rubber are burned, a large amount of acid / alkali mist and deliquescent sticky dust such as mirabilite are generated, and these dusts are removed by the conventional wet method or dry method. It was difficult to remove it while maintaining high exhaust gas treatment capacity and high dust removal rate.
【0003】すなわち湿式法では、大量の排ガスを複数
回スクラバー処理しなければならず、また乾式法では、
ダスト等により濾過材が閉塞して濾過材を交換しなけれ
ばならないなどの欠点があった。
That is, in the wet method, a large amount of exhaust gas must be scrubbed multiple times, and in the dry method,
There is a defect that the filter medium is clogged by dust and the filter medium must be replaced.
【0004】[0004]
【発明が解決しようとする課題】本発明が解決せんとす
る課題は、大量の排ガスから高い除去率でダスト等を除
去すること、かつ濾過材が容易に再生可能である点であ
る。
The problem to be solved by the present invention is to remove dust and the like from a large amount of exhaust gas at a high removal rate, and to regenerate the filter medium easily.
【0005】[0005]
【課題を解決するための手段】上記課題を解決するため
の本発明は、ダスト濃度200mg/Nm3 以下の燃焼排ガス
を、60μm以下、好ましくは10〜30μmの孔径を有し、
水、酸性液またはアルカリ性液による洗浄、乾燥により
再生が可能である合成樹脂処理繊維製濾過材を通して前
記ダストを捕集することを特徴とするものである。
Means for Solving the Problems The present invention for solving the above problems provides a combustion exhaust gas having a dust concentration of 200 mg / Nm 3 or less and a pore size of 60 μm or less, preferably 10 to 30 μm,
It is characterized in that the dust is collected through a synthetic resin-treated fiber filter material which can be regenerated by washing with water, an acidic solution or an alkaline solution and drying.
【0006】以下、本発明の方法を、焼却炉からの排ガ
ス処理を例に図1にもとづき説明する。排ガスAは、た
とえばスクラバー1において湿式処理されて媒塵および
有害ガス成分が低減されると共に約50℃に冷却されて、
ダスト濃度200mg/Nm3 以下の排ガスBが得られる。本
発明はスクラバー1の使用に限定されるものではなく、
濾過装置4に供給される排ガスBのダスト濃度を200mg
/Nm3 以下にすることができる他の除塵装置、たとえば
バグフィルターや電気集塵機などを使用することができ
る。
The method of the present invention will be described below with reference to FIG. 1 by taking an exhaust gas treatment from an incinerator as an example. Exhaust gas A is wet-processed, for example, in a scrubber 1 to reduce dust particles and harmful gas components and is cooled to about 50 ° C.,
Exhaust gas B having a dust concentration of 200 mg / Nm 3 or less is obtained. The present invention is not limited to the use of scrubber 1,
The dust concentration of the exhaust gas B supplied to the filtration device 4 is set to 200 mg.
It is possible to use other dust removing devices that can reduce the amount to less than / Nm 3 , for example, a bag filter or an electrostatic precipitator.
【0007】排ガスBは再加熱器2で約80℃に加熱さ
れ、管路3を介してダスト除去装置4に導かれ、濾過材
5を通過する際に媒塵および硫酸ソーダ等のダスト等が
除去され、更に管路6を経てHEPAフィルター (high eff
iciency particulate absolute:高性能フィルター) 7
によって濾過され、ファン8により系外に排出される。
The exhaust gas B is heated to about 80 ° C. by the reheater 2 and guided to the dust removing device 4 through the pipe line 3. When passing through the filter medium 5, dust such as medium dust and sodium sulfate is removed. HEPA filter ( h igh e ff
iciency p articulate a bsolute: High performance filter) 7
And is discharged to the outside of the system by the fan 8.
【0008】濾過材5がダスト等に閉塞されて濾過抵抗
が上昇した場合には、濾過材5の洗浄を行なう。すなわ
ち洗浄水タンク9の洗浄水をポンプ10により管路11、バ
ルブ12を経て散水スパージャーノズル13から濾過材5の
内側 (排ガス供給側) にスプレーする。噴射された洗浄
水は濾過材5を通過する際に濾過材5を洗浄する。洗浄
水の一部は、濾過材の内側 (排ガス供給側) 表面の付着
物を洗い落としながら落下し、ドレンバルブ14を経てダ
スト除去装置4から排出され、洗浄水タンク9に入る。
When the filter medium 5 is clogged with dust or the like to increase the filtration resistance, the filter medium 5 is washed. That is, the washing water in the washing water tank 9 is sprayed by the pump 10 from the water sparger nozzle 13 through the pipe 11 and the valve 12 to the inside of the filter medium 5 (exhaust gas supply side). The sprayed cleaning water cleans the filter medium 5 when passing through the filter medium 5. Part of the wash water drops while washing off the deposits on the inner surface (exhaust gas supply side) of the filter medium, is discharged from the dust removing device 4 through the drain valve 14, and enters the wash water tank 9.
【0009】一方、濾過材5を通過し、硫酸ソーダミス
ト等の可溶性の付着物を溶解した洗浄水は、濾過材5の
外側表面 (排ガス排出側表面) を流れ落ち、ドレンバル
ブ15から洗浄水タンク9に入る。洗浄終了後はドレンバ
ルブ14, 15および洗浄水バルブ12を閉じ、焼却炉1の予
熱期間の清澄排ガスを再加熱器2、管路3から濾過材5
に通気して乾燥する。
On the other hand, the wash water which has passed through the filter medium 5 and dissolved soluble deposits such as sodium sulfate mist flows down the outer surface (exhaust gas discharge side surface) of the filter medium 5 and is drained from the drain valve 15 to the wash water tank. Enter 9. After the cleaning is completed, the drain valves 14 and 15 and the cleaning water valve 12 are closed, and the clarified exhaust gas in the preheating period of the incinerator 1 is reheated from the reheater 2 and the pipe 3 to the filter medium 5.
Aerate and dry.
【0010】濾過材5の水洗直後で、濾過材5の通気抵
抗が過大なために焼却炉1の清澄排ガスの通気量が十分
でない場合には、濾過装置4のバイパス管路バルブ16を
開けて十分な通風量を確保すると共に、焼却炉1の清澄
排ガスの顕熱で濾過材5の予備乾燥を行なう。そして濾
過材5の通気抵抗がある程度低下したら、バイパスバル
ブ16を閉じて濾過材5に通気し、濾過材5を完全に乾燥
する。
Immediately after washing the filter medium 5 with water, when the ventilation amount of the filter medium 5 is excessive and the ventilation amount of the clarified exhaust gas in the incinerator 1 is not sufficient, the bypass line valve 16 of the filtration device 4 is opened. A sufficient amount of ventilation is secured, and the filter medium 5 is pre-dried by the sensible heat of the clarified exhaust gas from the incinerator 1. When the ventilation resistance of the filter medium 5 is lowered to some extent, the bypass valve 16 is closed to ventilate the filter medium 5 to completely dry the filter medium 5.
【0011】なお、かかる濾過材5の乾燥過程におい
て、場合によっては、濾過装置4の後流管路における水
分凝縮を防ぐための措置が必要となる。この場合には、
バルブ17の開度を調節して再加熱器2で加熱された加熱
ガスを管路18を経て供給して水分の凝縮を防止すること
ができる。あるいは、濾過器4の後流側に、再加熱器を
設けることもできる。
In the process of drying the filter medium 5, it is necessary to take measures to prevent water condensation in the downstream pipe of the filter device 4, depending on the case. In this case,
It is possible to prevent the condensation of water by supplying the heating gas heated by the reheater 2 through the pipe 18 by adjusting the opening degree of the valve 17. Alternatively, a reheater can be provided on the downstream side of the filter 4.
【0012】図2および図3に本発明の方法における濾
過装置4の概要を、また図3に濾過材5の一例の概要を
示す。濾過材5は、不織布、繊維織物、または編物の繊
維を合成樹脂で被覆し成形したものであり、60μm 以
下、好ましくは10〜30μmの孔径を有する。たとえば少
量のポリエチレンを含むポリプロピレンで加熱成形処理
された不織布が波形に折りたたまれてなる濾過材 (外径
400φ、長さ500φ) が用いられる。
2 and 3 show an outline of the filter device 4 in the method of the present invention, and FIG. 3 shows an example of the filter medium 5. The filter material 5 is formed by coating fibers of a non-woven fabric, a fiber woven fabric, or a knitted fabric with a synthetic resin, and has a pore diameter of 60 μm or less, preferably 10 to 30 μm. For example, a filter material (outer diameter of 400φ, length of 500φ) formed by folding a corrugated nonwoven fabric that has been heat-molded with polypropylene containing a small amount of polyethylene is used.
【0013】洗浄水としては、水、酸性水、アルカリ性
水等の液体が通常用いられ、上述のように、これら洗浄
水のスプレーによる洗浄以外に、濾過装置4内に洗浄水
を充填して濾過材を洗浄液に浸漬する方法あるいは濾過
材に洗浄水を流下する方法などを採用することができ
る。濾過材5は繊維表面が上記のように合成樹脂で被覆
され、成形されているので、洗浄水によって型くづれす
ることがなく、かつ乾燥が容易である。従って、上述の
とおり、濾過装置内に濾過材を収容したままで容易に再
生することができる。
As the washing water, liquids such as water, acidic water and alkaline water are usually used. As described above, in addition to the washing by spraying these washing water, the washing water is filled in the filtering device 4 and filtered. A method of immersing the material in the cleaning liquid, a method of flowing the cleaning water into the filter material, or the like can be adopted. Since the fiber surface of the filter medium 5 is coated with the synthetic resin as described above and molded, the filter medium 5 is not deformed by the wash water and is easily dried. Therefore, as described above, the filter medium can be easily regenerated with the filter medium still contained.
【0014】なお、図1には濾過装置4が1系列の場合
を示したが、連続運転を行なう場合には、濾過装置4を
複数系列にして濾過工程と洗浄、乾燥工程に切換えるこ
とにより、対処することができる。また本発明の方法
は、ファン8によって常時系全体が負圧に維持されてい
るので、高い安全性が要求される原子力関連施設からの
排ガスのダスト等の除去に好適に使用することもでき
る。以下、本発明の実施例を述べる。
Although FIG. 1 shows a case where the filtration device 4 is of one series, when performing continuous operation, by switching the filtration device 4 to a filtration process, a washing process and a drying process by using a plurality of filtration devices 4 in series. Can be dealt with. Further, the method of the present invention can be suitably used for removing dust and the like of exhaust gas from a nuclear power facility requiring high safety because the entire system is always maintained at a negative pressure by the fan 8. Examples of the present invention will be described below.
【0015】[0015]
【実施例】図1に示した工程によってバッチ式焼却炉の
排ガスからダスト等を除去し、濾過装置4によるダスト
等の除去前後のダスト濃度をJIS Z 8808規定の方法で測
定した。結果を図4に示す。なお、濾過材5には図3に
示したポリプロピレン処理不織布を用いた。
[Examples] Dust and the like were removed from the exhaust gas of the batch type incinerator by the process shown in FIG. 1, and the dust concentration before and after the removal of the dust and the like by the filtration device 4 was measured by the method specified in JIS Z 8808. The results are shown in Fig. 4. The polypropylene 5 shown in FIG. 3 was used as the filter material 5.
【0016】また、濾過装置4の圧力損失が初期値の10
倍程度に達したならば、濾過材5をスクラバー1の塔底
水によりスプレー洗浄し、焼却炉1の予熱期間の清澄排
ガスで通気乾燥した後、濾過装置4の圧力損失を測定し
て再生効果を確認した。主要な実験条件を以下に示す。 濾過材数 :4本 被焼却物 :廃樹脂、天然ゴム、加硫ゴム、チャ
ーコール、ガラスフリット、紙、布。
The pressure loss of the filtering device 4 is 10 which is the initial value.
If it reaches about twice, the filter medium 5 is spray-washed with the bottom water of the scrubber 1 and dried by aeration with the clarified exhaust gas in the preheating period of the incinerator 1, and then the pressure loss of the filter device 4 is measured to regenerate the effect. It was confirmed. The main experimental conditions are shown below. Number of filtration materials: 4 Items to be incinerated: Waste resin, natural rubber, vulcanized rubber, charcoal, glass frit, paper, cloth.
【0017】被焼却物供給速度:10〜20kg/h 焼却温度 :1100〜1300℃ 排ガス風量 :約300Nm3/h 運転時間 :約8時間/バッチ 濾過材洗浄水pH :約9 濾過材洗浄水温度:約50℃ 洗浄水流量 :約0.3m3/h (濾過材1本当り) 洗浄時間 :30分 乾燥用ガス温度 :約70℃ 乾燥時間 :約2時間 図4から明らかなように、濾過装置入口側排ガスのダス
ト濃度が90〜300mg/Nm3−乾燥ガスであるのに対し
て、出口側排ガスのダスト濃度は1.0mg/Nm3−乾燥ガ
ス以下となっており、99%以上の除塵率が得られること
が明らかである。
Incineration material supply rate: 10 to 20 kg / h Incineration temperature: 1100 to 1300 ° C. Exhaust gas flow rate: Approx. 300 Nm 3 / h Operating time: Approx. 8 hours / batch Filter material cleaning water pH: Approx. 9 Filter material cleaning water temperature : Approx. 50 ° C Washing water flow rate: Approximately 0.3m 3 / h (per filter material) Cleaning time: 30 minutes Drying gas temperature: Approx. 70 ° C Drying time: Approximately 2 hours The dust concentration of the exhaust gas on the inlet side is 90 to 300 mg / Nm 3 -dry gas, while the dust concentration of the exhaust gas on the outlet side is 1.0 mg / Nm 3 -dry gas or less, and 99% or more of the dust is removed. It is clear that rates are obtained.
【0018】また濾過装置の圧力損失 (ガス流量300Nm
3/h 換算) は、初期値18mmAq. 程度から、被焼却物に
もよるが、5〜10バッチ (延べ処理量200〜400kg) 程
度で150mmAq.に達し、その都度、洗浄、乾燥による再生
を行なった。この結果、圧力損失は、ほぼ初期値まで回
復した。また、再生濾過材の除塵性能は、再生前と比較
して有意な差は認められなかった。
Also, the pressure loss of the filtration device (gas flow rate 300 Nm
3 / h conversion) is about 18mmAq. From initial value to 150mmAq. In about 5-10 batches (total processing amount of 200-400kg), depending on the incinerated material. I did. As a result, the pressure loss recovered to almost the initial value. In addition, the dust removal performance of the recycled filter material was not significantly different from that before the regeneration.
【0019】[0019]
【発明の効果】以上述べたように本発明によれば、ダス
ト濃度200mg/Nm3 以下の排ガスをダスト濃度1mg/Nm
3 以下に低下させることができ、除塵率99%以上が可能
である。更に本発明において使用する濾過材は洗浄、乾
燥による再生が可能であり、潮解性の芒硝のような粘着
性物質が付着した濾過材も容易に再生することができ
る。従って本発明の方法は原子力関連焼却炉排ガスの処
理に好適である。
As described above, according to the present invention, exhaust gas having a dust concentration of 200 mg / Nm 3 or less is treated with a dust concentration of 1 mg / Nm 3.
It can be reduced to 3 or less, and a dust removal rate of 99% or more is possible. Further, the filter medium used in the present invention can be regenerated by washing and drying, and the filter medium having an adherent substance such as deliquescent salt cake attached thereto can be easily regenerated. Therefore, the method of the present invention is suitable for the treatment of nuclear-related incinerator exhaust gas.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明の方法の工程図である。FIG. 1 is a process drawing of the method of the present invention.
【図2】本発明における濾過装置の説明図である。FIG. 2 is an explanatory diagram of a filtration device according to the present invention.
【図3】本発明における濾過材の概要図である。FIG. 3 is a schematic diagram of a filter medium according to the present invention.
【図4】本発明の方法の除塵率を示す図である。FIG. 4 is a diagram showing the dust removal rate of the method of the present invention.
【符号の説明】[Explanation of symbols]
4 濾過装置 5 濾過材 9 洗浄水タンク 4 Filtration device 5 Filtration material 9 Wash water tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 冬比古 神奈川県横浜市鶴見区鶴見中央二丁目12番 1号 千代田化工建設株式会社内 (72)発明者 須永 章敏 神奈川県横浜市鶴見区鶴見中央二丁目12番 1号 千代田化工建設株式会社内 (72)発明者 衛藤 和夫 神奈川県横浜市鶴見区鶴見中央二丁目12番 1号 千代田化工建設株式会社内 (72)発明者 宮崎 仁 茨城県東茨城郡大洗町成田町4002 動力 炉・核燃料開発事業団大洗工学センター内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fuyuko Ishikawa 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd. (72) Akitoshi Sunaga Tsurumi, Tsurumi-ku, Yokohama-shi, Kanagawa Chuo 2-12-1 Chiyoda Kakoh Construction Co., Ltd. (72) Inventor Kazuo Eto Tsurumi-ku, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd. (72) Inventor Hitoshi Miyazaki Ibaraki Higashi 4002 Narita-cho, Oarai-cho, Ibaraki-gun Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation

Claims (1)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 ダスト濃度200mg/Nm3 以下の燃焼排ガ
    スを水、酸性液またはアルカリ性液による洗浄、乾燥に
    より再生が可能である合成樹脂処理繊維製濾過材を通し
    て前記ダストを捕集することを特徴とする燃焼排ガスか
    らダスト等を除去する方法。
    1. The dust is collected through a synthetic resin-treated fiber filter material which can be regenerated by washing and drying combustion exhaust gas having a dust concentration of 200 mg / Nm 3 or less with water, an acid solution or an alkaline solution. The method of removing dust etc. from the combustion exhaust gas.
JP23966291A 1991-09-19 1991-09-19 Removal of dust from combustion exhaust gas Pending JPH05123520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23966291A JPH05123520A (en) 1991-09-19 1991-09-19 Removal of dust from combustion exhaust gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23966291A JPH05123520A (en) 1991-09-19 1991-09-19 Removal of dust from combustion exhaust gas

Publications (1)

Publication Number Publication Date
JPH05123520A true JPH05123520A (en) 1993-05-21

Family

ID=17048038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23966291A Pending JPH05123520A (en) 1991-09-19 1991-09-19 Removal of dust from combustion exhaust gas

Country Status (1)

Country Link
JP (1) JPH05123520A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101157095B1 (en) * 2010-02-19 2012-06-27 서경준 A melting apparatus using a waste

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101157095B1 (en) * 2010-02-19 2012-06-27 서경준 A melting apparatus using a waste

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