JPH08243341A - Treatment of waste gas - Google Patents
Treatment of waste gasInfo
- Publication number
- JPH08243341A JPH08243341A JP7079392A JP7939295A JPH08243341A JP H08243341 A JPH08243341 A JP H08243341A JP 7079392 A JP7079392 A JP 7079392A JP 7939295 A JP7939295 A JP 7939295A JP H08243341 A JPH08243341 A JP H08243341A
- Authority
- JP
- Japan
- Prior art keywords
- bag filter
- adsorbent
- exhaust gas
- dust
- added
- 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
- 239000002912 waste gas Substances 0.000 title abstract 4
- 239000003463 adsorbent Substances 0.000 claims abstract description 29
- 239000000428 dust Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 15
- 150000002013 dioxins Chemical class 0.000 claims abstract description 7
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 4
- 238000010410 dusting Methods 0.000 abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000000654 additive Substances 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 6
- 238000003795 desorption Methods 0.000 description 5
- 229910001385 heavy metal Inorganic materials 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Hg and Cd Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排ガスの処理方法に係
り、特に、焼却炉の排ガスに含まれるダイオキシン類、
ＨＣｌ及び重金属類等の有害成分を除去する焼却排ガス
の処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating exhaust gas, and particularly to dioxins contained in exhaust gas from an incinerator,
The present invention relates to a method for treating incineration exhaust gas for removing harmful components such as HCl and heavy metals.
【０００２】[0002]
【従来の技術】従来、焼却排ガスの処理では、バグフィ
ルタ上流で排ガス中に粉末活性炭等の吸着剤を添加し、
バグフィルタでダストと共に吸着剤を除去する方法が実
施されていた。このような方式では、ダストに活性炭等
の吸着剤が混入し、捕集した灰が黒色を呈すること及び
灰の熱灼減量が増加するといった問題点があった。ま
た、活性炭等の吸着剤をリサイクルして吸着剤の使用量
を低減させることが困難であり、吸着剤とダストが混じ
った大量の灰をリサイクルする場合には、バグフィルタ
のダスト負荷が増大し、逆洗頻度が高くなり、ろ布寿命
が短くなるといった問題点もあった。2. Description of the Related Art Conventionally, in the treatment of incineration exhaust gas, an adsorbent such as powdered activated carbon is added to the exhaust gas upstream of the bag filter,
A method of removing the adsorbent together with dust with a bag filter has been implemented. In such a method, there is a problem that an adsorbent such as activated carbon is mixed in the dust, the collected ash appears black, and the amount of ash burned is increased. In addition, it is difficult to reduce the amount of adsorbent used by recycling the adsorbent such as activated carbon, and when recycling a large amount of ash mixed with adsorbent and dust, the dust load on the bag filter increases. However, there is also a problem that the backwash frequency becomes high and the filter cloth life becomes short.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解消し、添加した吸着剤を循環使用でき、
ダイオキシン等の有害成分も簡易に高効率で除去できる
焼却排ガスの処理方法を提供することを課題とする。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and allows the added adsorbent to be reused.
An object of the present invention is to provide a method for treating incineration exhaust gas that can easily remove harmful components such as dioxins with high efficiency.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、焼却排ガスを１３０〜２００℃に減温し
除塵した後に、吸着剤を添加してバグフィルタにより除
塵することを特徴とする排ガス処理方法としたものであ
る。本発明において、バグフィルタは吸着剤を捕集する
と共に、吸着剤と排ガス中の有害成分（ＨＣｌ、ダイオ
キシン、ＳＯｘ、Ｈｇ等）との反応を行わせるものであ
り、吸着特性からより低温であることが好ましいが、設
備の耐食の問題から酸露点以上とするのが好適であり、
１３０〜２００℃とするのがよく、１３０〜１５０℃が
特に好適である。In order to solve the above problems, the present invention is characterized in that the incineration exhaust gas is cooled to 130 to 200 ° C. to remove dust, and then an adsorbent is added to remove dust with a bag filter. The exhaust gas treatment method is as follows. In the present invention, the bag filter collects the adsorbent and causes the reaction of the adsorbent with harmful components (HCl, dioxin, SOx, Hg, etc.) in the exhaust gas, and the temperature is lower due to the adsorption property. However, it is preferable to have an acid dew point or higher from the viewpoint of corrosion resistance of equipment.
The temperature is preferably 130 to 200 ° C, and 130 to 150 ° C is particularly preferable.
【０００５】本発明においては、前記バグフィルタで捕
集した吸着剤は、一部を循環使用し、新しい吸着剤と共
にバグフィルタ上流に添加するのがよい。また、前記バ
グフィルタから排出される捕集物は、一部又は全量を上
流側の除塵処理の上流に添加するか、又は、還元雰囲気
下で３５０℃以上、特に４００℃以上に加熱し、吸着し
たダイオキシン類及びＨｇ、Ｃｄ等の金属類を脱着・分
解した後、バグフィルタ上流に再添加することができ
る。上記の加熱脱着・分解は特公平６−３８８６３号公
報に開示されているポリハロゲン化化合物の分解方法を
適用することができる。また、本発明で使用できる吸着
剤としては、粉末活性炭、活性コークス、消石灰又はこ
れらを組合せたものが好適に用いられるが、これらに限
定されず公知の吸着剤を使用できる。前置の除塵器は電
気集塵機、マルチサイクロン及びバグフィルタ等が適用
されるが、捕集効率が最も高いバグフィルタが最も好ま
しい。In the present invention, it is preferable that a part of the adsorbent collected by the bag filter is recycled and added together with the new adsorbent upstream of the bag filter. In addition, the collected matter discharged from the bag filter may be partially or wholly added upstream of the dust removal treatment on the upstream side, or may be heated to 350 ° C. or higher, particularly 400 ° C. or higher in a reducing atmosphere for adsorption. After desorbing and decomposing the dioxins and the metals such as Hg and Cd, they can be added again upstream of the bag filter. For the above-mentioned thermal desorption / decomposition, the method for decomposing a polyhalogenated compound disclosed in JP-B-6-38863 can be applied. Further, as the adsorbent that can be used in the present invention, powdered activated carbon, activated coke, slaked lime, or a combination thereof is preferably used, but the adsorbent is not limited to these and a known adsorbent can be used. An electric dust collector, a multi-cyclone, a bag filter and the like are applied to the pre-dust remover, but a bag filter having the highest collection efficiency is most preferable.
【０００６】[0006]
【作用】本発明では、上記のように、焼却排ガスを減温
・除塵して、排ガス中のダストを先ず除去した後に、吸
着剤を添加してバグフィルタで除塵することとしたた
め、吸着剤中にはダストが含まれていず、ダイオキシン
類やＨＣｌ、重金属類等の有害成分のみが効率よく吸着
除去できると共に、捕集した吸着剤は、そのまま効率的
に循環使用できると共に再生処理をして循環使用するこ
ともできる。In the present invention, as described above, the temperature of the incinerator exhaust gas is reduced and the dust is removed, and after the dust in the exhaust gas is first removed, the adsorbent is added and the dust is removed by the bag filter. Does not contain dust, and can efficiently adsorb and remove only harmful components such as dioxins, HCl, and heavy metals, and the collected adsorbents can be efficiently recycled as they are and recycled after being recycled. It can also be used.
【０００７】[0007]
【実施例】以下、本発明を実施例により具体的に説明す
るが、本発明はこれに限定されるものではない。 実施例１ 図１に本発明の排ガス処理方法の一例を工程図で示す。
図１において、焼却炉１からの焼却炉排ガスは、ボイ
ラ、水噴射式のガス冷却装置等の減温装置２により、排
ガス温度を１５０℃まで減温して、バグフィルタ、電気
集塵器等の除塵設備３で除塵する。除塵した排ガスに吸
着剤７を添加して、バグフィルタ４で再度除塵する。バ
グフィルタ４で除塵した灰は、脱着・再生設備６で、還
元雰囲気下で４００℃以上に加熱して再生処理して、吸
着剤７と共にバグフィルタ４の上流側に添加する。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Example 1 FIG. 1 is a process diagram showing an example of the exhaust gas treatment method of the present invention.
In FIG. 1, the incinerator exhaust gas from the incinerator 1 is reduced in temperature to 150 ° C. by a boiler, a water temperature reducing device 2 such as a water injection type gas cooling device, a bag filter, an electrostatic precipitator, etc. Dust is removed by the dust removal equipment 3. The adsorbent 7 is added to the dust-removed exhaust gas, and dust is removed again by the bag filter 4. The ash removed by the bag filter 4 is heated in the desorption / regeneration facility 6 to 400 ° C. or higher in a reducing atmosphere to be regenerated, and then added to the upstream side of the bag filter 4 together with the adsorbent 7.
【０００８】また、バグフィルタ４からの灰は脱着・再
生設備６を通って、除塵設備３の上流側に添加すること
ができる。除塵設備３からのダストは灰処理設備８で処
理される。また、脱着・再生設備６からの排出ガスには
Ｈｇ等の揮発性重金属が含まれているので、重金属処理
施設９で処理される。次に、各種吸着剤の１５０℃にお
けるダイオキシン除去特性を図２に示す。図２におい
て、ろ過速度は１ｍ／分で各添加剤のバグフィルタ表面
保持量で示している。図２に示されるように、吸着剤と
しては粉末活性炭及び粉末活性コークスが適当であり、
これらと消石灰を同時に添加する場合にも高率でダイオ
キシン類が除去できることが確認できた。Further, the ash from the bag filter 4 can be added to the upstream side of the dust removing equipment 3 through the desorption / regeneration equipment 6. The dust from the dust removing equipment 3 is processed by the ash processing equipment 8. Further, since the exhaust gas from the desorption / regeneration facility 6 contains volatile heavy metals such as Hg, it is treated in the heavy metal treatment facility 9. Next, the dioxin removal characteristics of various adsorbents at 150 ° C. are shown in FIG. In FIG. 2, the filtration rate is 1 m / min and the bag filter surface retention amount of each additive is shown. As shown in FIG. 2, powdered activated carbon and powdered activated coke are suitable as the adsorbent,
It was confirmed that dioxins could be removed at a high rate even when these and slaked lime were added at the same time.
【０００９】[0009]
【発明の効果】本発明によれば、次のような効果を奏す
ることができる。 １）吸着剤の循環使用により、同一の効率で有害成分を
除去する場合の吸着剤の使用量を、以下の表１に例示す
るように１／２以下に大巾に削減できた。According to the present invention, the following effects can be obtained. 1) By using the adsorbent in a circulating manner, the amount of the adsorbent used in the case of removing harmful components with the same efficiency could be greatly reduced to 1/2 or less as illustrated in Table 1 below.
【表１】 [Table 1]
【００１０】２）従来法では添加剤がダストにより希釈
されるため、バグフィルタに形成されるケーク層が一定
厚みの場合（バグフィルタの圧力損失を一定に制御して
払い落しを行う場合）、排ガス中のダスト濃度に比例し
て添加剤を供給するか、過剰添加を行わなければ、所定
の効果が得られなかったが、本発明では添加剤のみのケ
ーク層がバグフィルタに形成されるため、ケーク層の厚
みを一定とすることで安定した除去率を得ることができ
る。 ３）添加剤を単独で再生使用することが可能となった。 ４）バグフィルタ捕集添加物の一部廃棄分を上流側の除
塵処理の上流に添加することにより、除害効率を向上さ
せることができる。2) In the conventional method, since the additive is diluted with dust, when the cake layer formed on the bag filter has a constant thickness (when the pressure loss of the bag filter is controlled to be constant, the dust is removed). If the additive is supplied in proportion to the dust concentration in the exhaust gas or if it is not excessively added, the predetermined effect was not obtained, but in the present invention, the cake layer of the additive alone is formed in the bag filter. By making the thickness of the cake layer constant, a stable removal rate can be obtained. 3) It became possible to recycle the additive alone. 4) By adding a part of the bag filter trapping additive to the upstream side of the dust removal processing on the upstream side, the removal efficiency can be improved.
【図１】本発明の排ガス処理方法の一例を示す工程図。FIG. 1 is a process chart showing an example of an exhaust gas treatment method of the present invention.
【図２】各種添加物のダイオキシン除去効果を示すグラ
フ。FIG. 2 is a graph showing the dioxin removing effect of various additives.
１：焼却炉、２：減温装置、３：除塵設備、４：バグフ
ィルタ、５：煙突、６：脱着・再生設備、７：吸着剤、
８：灰処理設備、９：重金属処理設備1: incinerator, 2: temperature reduction device, 3: dust removal equipment, 4: bag filter, 5: chimney, 6: desorption / regeneration equipment, 7: adsorbent,
8: Ash treatment equipment, 9: Heavy metal treatment equipment
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ０１Ｄ 53/64 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B01D 53/64
Claims (4)
剤を添加してバグフィルタにより除塵することを特徴と
する排ガス処理方法。1. A method of treating exhaust gas, which comprises removing the dust from an incinerator exhaust gas by reducing the temperature of the incinerated exhaust gas, and then adding an adsorbent to remove dust from the bag filter.
一部を循環使用することを特徴とする請求項１記載の排
ガス処理方法。2. The adsorbent collected by the bag filter is
The exhaust gas treatment method according to claim 1, wherein a part of the exhaust gas is recycled.
は、一部又は全量を上流側の除塵処理の上流に添加する
ことを特徴とする請求項１記載の排ガス処理方法。3. The exhaust gas treatment method according to claim 1, wherein a part or the whole of the collected matter discharged from the bag filter is added upstream of the dust removal processing on the upstream side.
は、還元雰囲気下で３５０℃以上に加熱し、吸着したダ
イオキシン類を脱着・分解した後、バグフィルタ上流に
再添加することを特徴とする請求項１記載の排ガス処理
方法。4. The collected matter discharged from the bag filter is heated to 350 ° C. or higher in a reducing atmosphere to desorb and decompose adsorbed dioxins, and then added again upstream of the bag filter. The exhaust gas treatment method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7079392A JPH08243341A (en) | 1995-03-13 | 1995-03-13 | Treatment of waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7079392A JPH08243341A (en) | 1995-03-13 | 1995-03-13 | Treatment of waste gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08243341A true JPH08243341A (en) | 1996-09-24 |
Family
ID=13688599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7079392A Pending JPH08243341A (en) | 1995-03-13 | 1995-03-13 | Treatment of waste gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08243341A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000042357A (en) * | 1998-07-27 | 2000-02-15 | Hitachi Zosen Corp | Low temperature recycling type exhaust gas treatment method |
| US6279491B1 (en) | 1999-10-05 | 2001-08-28 | Ngk Insulators, Ltd. | Method of treating exhaust gas |
| US6511527B2 (en) | 2001-02-06 | 2003-01-28 | Ngk Insulators, Ltd. | Method of treating exhaust gas |
| JP2006298712A (en) * | 2005-04-22 | 2006-11-02 | Sumitomo Osaka Cement Co Ltd | Treatment method and apparatus of exhaust gas in cement manufacturing facility |
| JP2007117890A (en) * | 2005-10-28 | 2007-05-17 | Mitsubishi Heavy Ind Ltd | Exhaust gas treating method and system |
| JP2008030010A (en) * | 2006-07-27 | 2008-02-14 | Shinroku Nishiyama | Deodorizing method employing bag filter type dust collector and deodorizing device for bag filter type dust collector |
| WO2009093576A1 (en) * | 2008-01-21 | 2009-07-30 | Mitsubishi Heavy Industries, Ltd. | System for treating discharge gas from coal-fired boiler and method of operating the same |
| CN107648947A (en) * | 2017-11-10 | 2018-02-02 | 重庆林德科技发展有限公司 | High temperature dust waste gas treatment device |
-
1995
- 1995-03-13 JP JP7079392A patent/JPH08243341A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000042357A (en) * | 1998-07-27 | 2000-02-15 | Hitachi Zosen Corp | Low temperature recycling type exhaust gas treatment method |
| US6279491B1 (en) | 1999-10-05 | 2001-08-28 | Ngk Insulators, Ltd. | Method of treating exhaust gas |
| US6511527B2 (en) | 2001-02-06 | 2003-01-28 | Ngk Insulators, Ltd. | Method of treating exhaust gas |
| JP2006298712A (en) * | 2005-04-22 | 2006-11-02 | Sumitomo Osaka Cement Co Ltd | Treatment method and apparatus of exhaust gas in cement manufacturing facility |
| JP2007117890A (en) * | 2005-10-28 | 2007-05-17 | Mitsubishi Heavy Ind Ltd | Exhaust gas treating method and system |
| JP2008030010A (en) * | 2006-07-27 | 2008-02-14 | Shinroku Nishiyama | Deodorizing method employing bag filter type dust collector and deodorizing device for bag filter type dust collector |
| WO2009093576A1 (en) * | 2008-01-21 | 2009-07-30 | Mitsubishi Heavy Industries, Ltd. | System for treating discharge gas from coal-fired boiler and method of operating the same |
| JP2009166012A (en) * | 2008-01-21 | 2009-07-30 | Mitsubishi Heavy Ind Ltd | Exhaust gas treatment system and its operation method of coal fired boiler |
| US8071060B2 (en) | 2008-01-21 | 2011-12-06 | Mitsubishi Heavy Industries, Ltd. | Flue gas control system of coal combustion boiler and operating method thereof |
| CN107648947A (en) * | 2017-11-10 | 2018-02-02 | 重庆林德科技发展有限公司 | High temperature dust waste gas treatment device |
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