JPH11169662A - Waste gas treatment in incinerator - Google Patents

Waste gas treatment in incinerator

Info

Publication number
JPH11169662A
JPH11169662A JP9347712A JP34771297A JPH11169662A JP H11169662 A JPH11169662 A JP H11169662A JP 9347712 A JP9347712 A JP 9347712A JP 34771297 A JP34771297 A JP 34771297A JP H11169662 A JPH11169662 A JP H11169662A
Authority
JP
Japan
Prior art keywords
exhaust gas
regenerator
dust collector
dust
incinerator
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
JP9347712A
Other languages
Japanese (ja)
Inventor
Shinichi Yamada
愼一 山田
Kazuyoshi Takahashi
和義 高橋
Kohei Goto
浩平 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Ltd
Original Assignee
Sumitomo Heavy Industries Ltd
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 Sumitomo Heavy Industries Ltd filed Critical Sumitomo Heavy Industries Ltd
Priority to JP9347712A priority Critical patent/JPH11169662A/en
Publication of JPH11169662A publication Critical patent/JPH11169662A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a method of treating waste gas in which dust (waste) containing harmful substance such as dioxin is not discharged to outside a waste gas treating plant and the complicated recovery of by products such as sulfuric acid is not needed. SOLUTION: In a method of treating waste gas wherein an alkali agent is injected to waste gas generated from an incinerator 1 to treat it by a dust collector 5 and the waste gas, directly or after injecting NH3 to the waste gas, is introduced into an adsorber 7 packed with carbonaceous adsorbent 8 to be brought into contact with the carbonaceous adsorbent 8 and remove harmful substance, and also the carbonaceous adsorbent 8 that is used for waste gas treatment and deactivated is heated and regenerated by a regenerator 13 and is circulated to the adsorber 7, the dust collected by the dust collector 5 is fed into the regenerator 13 to subject it to heating treatment, and also the desorbed gas generated in the regenerator 13 is returned to the upstream side of the dust collector 5 to treat it.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、焼却炉における排
ガスの処理方法に関するものである。
The present invention relates to a method for treating exhaust gas in an incinerator.

【0002】[0002]

【従来の技術】近年、都市ゴミ等の廃棄物の量が増大
し、廃棄物処分場の不足が問題化している。そのため、
廃棄物を焼却処理することが益々増加している。廃棄物
を焼却処理した時、窒素酸化物(NOx),硫黄酸化物
(SOx),ハロゲン化水素(HCl,HF),ダイオキシ
ン(DXN)等の有機塩素化合物,水銀等の重金属類等
の有害物質が発生する。特に、DXNは、人類が作り出
した最も毒性の強い化合物であり、社会問題になってい
る。DXNを含有する排ガスとしては、廃棄物焼却炉排
ガスの他に、電炉排ガス等がある。
2. Description of the Related Art In recent years, the amount of waste such as municipal waste has increased, and the shortage of waste disposal sites has become a problem. for that reason,
Incineration of waste is increasing. Nitrogen oxides (NOx) and sulfur oxides when waste is incinerated
Toxic substances such as (SOx), hydrogen halides (HCl, HF), organic chlorine compounds such as dioxin (DXN), and heavy metals such as mercury are generated. In particular, DXN is the most toxic compound produced by mankind and has become a social problem. Exhaust gases containing DXN include electric furnace exhaust gases in addition to waste incinerator exhaust gases.

【0003】都市ゴミ、産業廃棄物等の焼却炉排ガス及
び電炉排ガス等には、上記した有害物質が発生するが、
これらの有害物質の処理方法として、例えば、ゴミ焼却
炉から発生する排ガスでは、ボイラ及びガス冷却装置を
経た後、集塵機(EP,バグ等)に導入される。この集
塵機の前で、排ガス中に注入される石灰等のアルカリ剤
により排ガス中のHCl,HFは、塩化カルシウム(C
aCl2),フッ化カルシウム(CaF2)の状態で除去さ
れる。また、SO2は、亜硫酸カルシウム(CaS
3),硫酸カルシウム(CaSO4)として除去され
る。排ガス中のDXN,水銀も注入した石灰及び燃焼に
伴って発生するフライングダストにかなり吸着除去さ
れ、集塵機で捕集された後、系外に排出される。さら
に、NOxの分解除去のため、この処理した排ガスにN
3を注入し、活性炭,活性コ−クス等の炭素質吸着剤
(触媒としても作用する)が充填された吸着器を通過さ
せて処理する方法がある。炭素質吸着剤は、集塵機で除
去できなかったSOx,DXN,水銀もほぼ完全に除去す
ることができる。このため、このプロセスは、種々な有
害な物質を含有した排ガスをクリ−ンな排ガスに処理で
きる大変優れた方法である。
The above-mentioned harmful substances are generated in incinerator exhaust gas such as municipal waste and industrial waste and electric furnace exhaust gas.
As a method of treating these harmful substances, for example, exhaust gas generated from a refuse incinerator is introduced into a dust collector (EP, bag, etc.) after passing through a boiler and a gas cooling device. Before this dust collector, HCl and HF in the exhaust gas are converted into calcium chloride (C) by an alkaline agent such as lime injected into the exhaust gas.
aCl 2 ) and calcium fluoride (CaF 2 ). In addition, SO 2 is obtained from calcium sulfite (CaS
O 3 ) and calcium sulfate (CaSO 4 ). DXN and mercury in the exhaust gas are also considerably absorbed and removed by the injected lime and flying dust generated by the combustion, collected by a dust collector, and then discharged out of the system. Further, in order to decompose and remove NOx, N
There is a method of injecting H 3 and passing it through an adsorber filled with a carbonaceous adsorbent (also acting as a catalyst) such as activated carbon or activated coke. The carbonaceous adsorbent can almost completely remove SOx, DXN, and mercury that could not be removed by the dust collector. For this reason, this process is a very excellent method capable of treating exhaust gas containing various harmful substances into clean exhaust gas.

【0004】しかし、上記集塵機より系外に排出される
ダスト(集塵したフライングダスト、注入した石灰及び
生成したCaCl2等の固形物の総称)の中には、有害なD
XN等が含有されているため、セメントと混ぜ合わせて
固化処理するか、あるいは別途設置した分解装置を用
い、低酸素化の還元性雰囲気において、350℃〜55
0℃に加熱処理をして無害化した後、埋め立てる必要が
ある。ただし、このようにセメントで固化する方法は、
容積の増加あるいは固化したものからの再溶出の可能性
もあり、また、加熱分解法は、高価な分解装置を別途必
要とする等の問題がある。
However, harmful D is included in dust (collected flying dust, injected lime, and generated solids such as CaCl 2 ) discharged from the dust collector out of the system.
Since it contains XN and the like, it is mixed with cement and solidified, or a separate decomposing device is used to reduce the temperature to 350 ° C to 55 ° C in a reducing atmosphere of low oxygen.
After detoxification by heat treatment at 0 ° C., it is necessary to reclaim. However, the method of solidifying with cement like this,
There is a possibility that the volume may be increased or re-elution may occur from the solidified material, and the thermal decomposition method has a problem that an expensive decomposition apparatus is separately required.

【0005】このような問題を解決する方法として、炭
素質吸着剤を用いる排ガス処理方法において、設置され
る再生器内に有害物質を供給して加熱処理する方法が提
案されている(特開平3−254817号公報参照)。
しかし、この方法では有害物質の大部分は分解処理でき
るが、未分解のもの、その他揮発性の物質が回収ガス
(SO2等)に混入するため、硫酸等を製造するためには
複雑な精製方法を必要とする。例えば、水洗等による精
製を行うとNH3,ダイオキシン,Hg等の有害物質を含
んだ排水が発生するという問題がある。
As a method for solving such a problem, in a method for treating exhaust gas using a carbonaceous adsorbent, a method has been proposed in which a harmful substance is supplied into a regenerator to be installed and heat treatment is performed (Japanese Patent Laid-Open No. Hei 3 (1994)). -254817).
However, in this method, most of the harmful substances can be decomposed, but undecomposed substances and other volatile substances can be recovered gas.
(SO 2 etc.), a complicated purification method is required to produce sulfuric acid and the like. For example, when purification is performed by washing with water or the like, there is a problem that wastewater containing harmful substances such as NH 3 , dioxin, and Hg is generated.

【0006】[0006]

【発明が解決しようとする課題】本発明は、上記炭素質
吸着剤を用いる従来の排ガス処理方法の問題点を解決し
ようとするものであり、排ガス処理プラントの系外にダ
イオキシン等の有害物質を含んだダスト(廃棄物)を排
出せず、かつ硫酸等の複雑な副製品回収を必要としない
排ガス処理法を提供することを課題とする。
SUMMARY OF THE INVENTION The present invention is to solve the problems of the conventional exhaust gas treatment method using the above carbonaceous adsorbent, and removes harmful substances such as dioxin outside the system of the exhaust gas treatment plant. It is an object of the present invention to provide an exhaust gas treatment method that does not discharge contained dust (waste) and does not require recovery of complicated by-products such as sulfuric acid.

【0007】[0007]

【課題を解決するための手段】本発明に係る焼却炉にお
ける排ガスの処理方法は、焼却炉から発生する排ガスに
アルカリ剤を注入して集塵機で処理し、この排ガスを、
直接あるいはNH3を注入した後、炭素質吸着剤が充填
された吸着器に導入して炭素質吸着剤と接触させて有害
物質を除去するとともに、排ガスの処理に供して不活化
した炭素質吸着剤を再生器で加熱再生して前記吸着器に
循環させる排ガスの処理方法であって、前記集塵機で捕
集されたダストを前記再生器内に供給して加熱処理する
とともに、再生器内で発生した脱離ガスを前記集塵機の
上流側に戻して処理することを特徴とする。また、排ガ
スの処理に供して不活化した炭素吸着剤と、集塵機で捕
集されたダストとを、再生器に交互に供給して処理して
もよい。
According to the method for treating exhaust gas in an incinerator according to the present invention, an alkaline agent is injected into exhaust gas generated from the incinerator, and the alkaline agent is treated by a dust collector.
Directly or after injecting NH 3 , it is introduced into an adsorber filled with a carbonaceous adsorbent, and is brought into contact with the carbonaceous adsorbent to remove harmful substances, and is subjected to exhaust gas treatment to inactivate carbonaceous adsorption. A method for treating exhaust gas in which an agent is heated and regenerated by a regenerator and circulated to the adsorber, wherein the dust collected by the dust collector is supplied to the regenerator for heat treatment and generated in the regenerator. The desorbed gas is returned to the upstream side of the dust collector for processing. Alternatively, the carbon adsorbent inactivated by the treatment of the exhaust gas and the dust collected by the dust collector may be alternately supplied to the regenerator for treatment.

【0008】さらに、焼却炉から発生する排ガスは、ボ
イラ/ガス冷却装置に導入され、前記ガス冷却装置を通
過して冷却された後にアルカリ剤を注入して集塵機で処
理し、また、前記ボイラから回収されるダストも上記再
生器に供給することが好ましい。そして、再生器で発生
した脱離ガスを冷却器にて冷却した後、水銀除去装置に
より水銀等の揮発性重金属を除去してから上記集塵機の
上流側に戻して処理することが好ましい。
Further, the exhaust gas generated from the incinerator is introduced into a boiler / gas cooling device, passes through the gas cooling device and is cooled, after which an alkali agent is injected and treated by a dust collector. It is preferable that the collected dust is also supplied to the regenerator. Then, after the desorbed gas generated in the regenerator is cooled by a cooler, it is preferable that volatile heavy metals such as mercury be removed by a mercury removing device and then returned to the upstream side of the dust collector for processing.

【0009】活性炭、活性コ−クス等の炭素質吸着剤を
使用して、排ガスを処理する場合、炭素質吸着剤に硫
酸、硫酸のアンモニウム塩、HCl、HF、DXN、Hg
等が吸着され、通ガス時間とともに吸着量が増加し、炭
素質吸着剤の吸着性能(及び触媒性能)が低下するの
で、加熱再生を行う必要がある。加熱再生では、炭素質
吸着剤の燃焼防止の点から低酸素の不活性ガス雰囲気下
で行われる。また、再生温度としては、吸着している硫
酸,アンモニウム塩を分解するために300℃〜600
℃が採用される。これらの条件は、DXNの熱分解にも
最適な条件であり、好都合である。
When exhaust gas is treated using a carbonaceous adsorbent such as activated carbon or activated coke, sulfuric acid, ammonium salts of sulfuric acid, HCl, HF, DXN, Hg
Are adsorbed, the amount of adsorption increases with the passage of gas, and the adsorption performance (and catalytic performance) of the carbonaceous adsorbent decreases. Therefore, it is necessary to perform heat regeneration. The heat regeneration is performed in an inert gas atmosphere of low oxygen from the viewpoint of preventing combustion of the carbonaceous adsorbent. The regeneration temperature is 300 ° C. to 600 ° C. to decompose the adsorbed sulfuric acid and ammonium salts.
° C is adopted. These conditions are optimal conditions for the thermal decomposition of DXN, which is convenient.

【0010】ところで、排ガス処理では含塵の処理が重
要で、バグフィルタ−、電気集塵機等で処理されるが、
ゴミ焼却炉、産廃焼却炉、電炉排ガスでは有害なDXN
が含まれ、これがダストに吸着されて集塵機で捕集され
るダストに混入して来るので、処理が必要になる。本発
明は、脱離ガスを集塵機の上流に戻して循環処理するた
め、脱離ガス中の不純物はほとんど完全に分解処理する
ことができ、しかも硫酸製造等の複雑な設備を必要とし
ない利点がある。また、本発明に係る排ガスの処理方法
は、集塵機で回収されるダストに限らず、ボイラ部等で
回収されるダストにも適用できることは当然である。
[0010] By the way, in the treatment of exhaust gas, dust-containing treatment is important and is treated by a bag filter, an electric dust collector, or the like.
DXN harmful in garbage incinerators, industrial waste incinerators, and electric furnace exhaust gas
Which is adsorbed by the dust and mixed into the dust collected by the dust collector, so that a treatment is required. The present invention has the advantage that the desorbed gas is returned to the upstream of the dust collector and circulated, so that impurities in the desorbed gas can be almost completely decomposed and the complicated equipment such as sulfuric acid production is not required. is there. Further, the method for treating exhaust gas according to the present invention is naturally applicable not only to dust collected by a dust collector, but also to dust collected by a boiler or the like.

【0011】[0011]

【発明の実施の形態】本発明の実施の形態を図1を参照
して説明する。焼却炉1から発生する排ガスは、ライン
2を介してボイラ/ガス冷却装置3に導入される。ガス
冷却装置3を通過して約80℃〜250℃に冷却された
排ガスを消石灰等のアルカリ剤を注入し、ライン4を介
してバグフィルタ−,電気集塵機等の集塵機5に導入す
る。この集塵機5で大部分のフライングダスト及びカル
シウム塩としてHCl、HF及びSO2が除去される他、
かなりのDXN,水銀が除去される。この集塵機5を通
過した排ガスは、直接あるいはNH3を注入した後、ラ
イン6を介して向流型又は直交流型の移動層吸着器7内
を下降する活性炭、活性コ−クス等の炭素質吸着剤8と
接触して処理される。ライン6にNH3を注入した場
合、排ガス中のNOxは、窒素と水に分解される。さら
に、集塵機5で除去できなかったHCl、HF、SOx、
DXN及び水銀等は、炭素質吸着剤8によりほとんど吸
着除去される。また、吸着器7により排出された排ガス
は、直接あるいは集塵機で処理された後、ライン9を経
て煙突10より大気中に放出される。
DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Exhaust gas generated from the incinerator 1 is introduced into the boiler / gas cooling device 3 via the line 2. The exhaust gas that has passed through the gas cooling device 3 and cooled to about 80 ° C. to 250 ° C. is injected with an alkali agent such as slaked lime and introduced into a dust collector 5 such as a bag filter or an electric dust collector via a line 4. In this dust collector 5, HCl, HF and SO 2 as most of the flying dust and calcium salts are removed.
Considerable DXN and mercury are removed. The exhaust gas that has passed through the dust collector 5 is directly or after injecting NH 3 , and then flows down through a moving bed adsorber 7 of a countercurrent type or a crossflow type via a line 6. It is treated in contact with the adsorbent 8. When NH 3 is injected into the line 6, NOx in the exhaust gas is decomposed into nitrogen and water. Further, HCl, HF, SOx, which could not be removed by the dust collector 5,
DXN and mercury are almost completely absorbed and removed by the carbonaceous adsorbent 8. The exhaust gas discharged by the adsorber 7 is discharged to the atmosphere from a chimney 10 through a line 9 directly or after being processed by a dust collector.

【0012】HCl、HF、SOx、DXN及び水銀等を
吸着して不活化した吸着器7内の炭素吸着剤8は、吸着
器7下部より引き抜かれ、ライン11を介して再生器1
3に供給され、不活性ガス雰囲気下(発生ガス雰囲気下
あるいは不活性ガス注入雰囲気下)のもとに300℃〜
600℃に加熱再生される。この時、炭素質吸着剤の性
能向上やDXNの分解効率を向上させるために再生器1
3にNH3を注入しても良い。例えば、NH3を注入する
場合、不活性ガスにNH3が添加される。
The carbon adsorbent 8 in the adsorber 7 that has been deactivated by adsorbing HCl, HF, SOx, DXN, mercury and the like is withdrawn from the lower part of the adsorber 7 and is supplied through the line 11 to the regenerator 1.
3, under an inert gas atmosphere (under a generated gas atmosphere or an inert gas injection atmosphere).
It is heated and regenerated to 600 ° C. At this time, in order to improve the performance of the carbonaceous adsorbent and the efficiency of decomposing DXN, the regenerator 1
3 may be injected with NH 3 . For example, when injecting the NH 3, NH 3 is added to the inert gas.

【0013】一方、集塵器5で回収されたダストは、ラ
イン12を介して再生器13に供給され、上記炭素質吸
着剤と共に加熱再生される。加熱再生された炭素質吸着
剤とダストは、ライン14を介して振動スクリ−ン等の
篩分器15に供給され、炭素質吸着剤と、炭素質吸着剤
粉及びダストとに分けられる。炭素質吸着剤は、コンベ
ア等16により吸着器7の上部に戻され、再使用され
る。
On the other hand, the dust collected by the dust collector 5 is supplied to a regenerator 13 via a line 12, and is regenerated by heating together with the carbonaceous adsorbent. The heated and regenerated carbonaceous adsorbent and dust are supplied to a sieving device 15 such as a vibrating screen through a line 14, and are separated into carbonaceous adsorbent and carbonaceous adsorbent powder and dust. The carbonaceous adsorbent is returned to the upper part of the adsorber 7 by the conveyor 16 or the like, and is reused.

【0014】上記の方法は、集塵機5で回収されたダス
トと不活化した炭素質吸着剤とを混合させた状態で加熱
再生しているが、集塵機5で回収されたダストと不活化
した炭素質吸着剤とを再生器に交互に供給し、加熱再生
しても良い。また、ボイラ3から回収されるダストもラ
イン24を介して、再生器13に供給し、集塵器5で回
収されるダストと同様に処理しても良い。すなわち、炭
素質吸着剤の再生器13を利用して300℃〜600℃
に加熱することにより、ダスト及び炭素質吸着剤中のD
XNは、無害化される。
In the method described above, the dust recovered by the dust collector 5 and the inactivated carbonaceous adsorbent are mixed for heating and regeneration, but the dust recovered by the dust collector 5 and the inactivated carbonaceous material are mixed. The adsorbent and the regenerator may be alternately supplied to the regenerator to regenerate by heating. Further, the dust collected from the boiler 3 may be supplied to the regenerator 13 via the line 24 and processed in the same manner as the dust collected by the dust collector 5. That is, 300 ° C. to 600 ° C. using the regenerator 13 of the carbonaceous adsorbent.
By heating to D in the dust and carbonaceous adsorbent
XN is rendered harmless.

【0015】再生器13内で発生したSO2、ハロゲン
化水素及び未分解のNH3、ダイオキシン等を含む脱離
ガスは、ライン23を介して集塵機5の上流側に戻して
処理される。特に、水銀等の揮発性重金属を除去したい
場合には、図1に示すように脱離ガスをライン18を介
して冷却器19にて約150℃〜200℃以下に冷却さ
れた後、水銀除去装置21で水銀が除去され、ライン2
3を経て集塵機5の上流に戻し、再処理される。水銀除
去装置21としては、水銀吸着剤を充填した装置あるい
は小型集塵機(バグフィルタ−等)を用いることができ
る。例えば、小型集塵機を用いる場合には、ライン17
から排出される炭素質吸着剤粉及びダストの混合物の一
部をライン22を介してライン20に注入し、この集塵
機(水銀除去装置21)で処理することができる。
The desorbed gas containing SO 2 , hydrogen halide, undecomposed NH 3 , dioxin and the like generated in the regenerator 13 is returned to the upstream side of the dust collector 5 through a line 23 for processing. In particular, when it is desired to remove volatile heavy metals such as mercury, the desorbed gas is cooled to about 150 ° C. to 200 ° C. or lower in a cooler 19 via a line 18 as shown in FIG. The mercury is removed by the device 21 and the line 2
3 and returned to the upstream of the dust collector 5 and reprocessed. As the mercury removing device 21, a device filled with a mercury adsorbent or a small dust collector (eg, a bag filter) can be used. For example, when using a small dust collector, the line 17
A part of the mixture of the carbonaceous adsorbent powder and the dust discharged from the apparatus is injected into the line 20 through the line 22 and can be treated by the dust collector (the mercury removing device 21).

【0016】なお、再生器13に用いられる焼成炉とし
ては、内熱式又は外熱式の回転炉(ロ−タリ−キル
ン)、移動床炉又は外熱式直立炉、多段床炉、流動床炉
など各種のものを用いることができる。
The firing furnace used for the regenerator 13 includes an internal heating or external heating type rotary furnace (rotary kiln), a moving bed furnace or an external heating upright furnace, a multi-stage floor furnace, a fluidized bed. Various things such as a furnace can be used.

【0017】[0017]

【実施例】ダスト1.5g/m3Nを含有する150℃に
温調された都市ゴミ焼却炉からの排ガス1000m3
/hを取り出し、図1に示すフロ−で処理した。すなわ
ち、被処理ガスにCa(OH)2を毎時1.32kgで添加し
た後、バグフィルタ−で集塵し、この排ガスにNH3
100ppm添加後、活性炭が2m3(1.2t)充填され
た直交流型移動層吸着器を通過させて処理した。また、
吸着器内で使用されて不活化した活性炭(DXN吸着量
0.83ng−TEQ/g活性炭)は、外熱式(熱交換
式)の移動層再生器に供給され、不活性ガス雰囲気下で
400℃に加熱して処理した。なお、吸着器での活性炭
の引き抜き量を毎時12kg(吸着器内での活性炭の滞留
時間を100時間)に調節して、再生器に供給した。集
塵器から排出される回収ダスト量(飛散灰+Ca塩)
は、毎時2.8kg(回収ダスト中のDXNは、3ng−
TEQ/gダスト)で、この回収ダストも上述した再生
器に不活化した活性炭とともに供給して処理した。
EXAMPLE 1000 m 3 N exhaust gas from a municipal waste incinerator controlled at 150 ° C. containing 1.5 g / m 3 N dust.
/ H was taken out and treated with the flow shown in FIG. That is, after the addition of Ca (OH) 2 per hour 1.32kg in the gas to be treated, bag filters - and dust collecting in, after 100ppm added NH 3 in the exhaust gas, the activated carbon is 2m 3 (1.2 t) filled The mixture was passed through a cross-flow moving bed adsorber for treatment. Also,
The activated carbon (DXN adsorption amount: 0.83 ng-TEQ / g activated carbon) used in the adsorber and inactivated is supplied to a moving bed regenerator of an external heat type (heat exchange type), and is supplied under an inert gas atmosphere. Processed by heating to ° C. The amount of activated carbon pulled out of the adsorber was adjusted to 12 kg per hour (the residence time of the activated carbon in the adsorber was adjusted to 100 hours) and supplied to the regenerator. Amount of collected dust discharged from dust collector (fly ash + Ca salt)
Is 2.8 kg / h (DXN in collected dust is 3 ng-
(TEQ / g dust), and this collected dust was also supplied to the above-described regenerator together with the inactivated activated carbon for treatment.

【0018】その結果、直交流式移動層吸着器出口処理
ガス中のDXNは、0.005ng−TEQ/m3N以下
であった。また、再生器より排出された活性炭とダスト
の混合物中のDXNは0.01ng−TEQ/g以下で
あり、集塵機で回収されたダスト中のDXNはほぼ完全
に分解された。再生器から発生する脱離ガス量は、5m
3N/hであり、この脱離ガス中のNH3は4800pp
m、HClは7200ppm、DXNは23.2ng−TEQ
/m3Nであった。このように、本発明では、上記脱離
ガスを集塵機の前に戻して処理するので、有害物質等を
ほぼ完全に処理することができる。
As a result, DXN in the processing gas at the outlet of the cross-flow moving bed adsorber was 0.005 ng-TEQ / m 3 N or less. DXN in the mixture of activated carbon and dust discharged from the regenerator was 0.01 ng-TEQ / g or less, and DXN in dust collected by the dust collector was almost completely decomposed. The amount of desorbed gas generated from the regenerator is 5m
3 N / h, and NH 3 in the desorbed gas is 4800 pp
m, HCl is 7200 ppm, DXN is 23.2 ng-TEQ
/ M 3 N. As described above, according to the present invention, since the desorbed gas is returned to the front of the dust collector for processing, harmful substances and the like can be almost completely processed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明に係る焼却炉における排ガスの処理方法
を示すフロ−図である。
FIG. 1 is a flowchart showing a method for treating exhaust gas in an incinerator according to the present invention.

【符号の説明】[Explanation of symbols]

1 焼却炉 2 ライン 3 ボイラ/ガス冷却装置 4 ライン 5 集塵機 6 ライン 7 吸着器 8 炭素質吸着剤 9 ライン 10 煙突 11 ライン 12 ライン 13 再生器 14 ライン 15 篩分器 16 コンベア等 17 ライン 18 ライン 19 冷却器 20 ライン 21 水銀除去装置 22 ライン 23 ライン 24 ライン 1 incinerator 2 line 3 boiler / gas cooling device 4 line 5 dust collector 6 line 7 adsorber 8 carbonaceous adsorbent 9 line 10 chimney 11 line 12 line 13 regenerator 14 line 15 sieve 16 conveyor 17 line 18 line 19 Cooler 20 lines 21 Mercury remover 22 lines 23 lines 24 lines

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 焼却炉から発生する排ガスにアルカリ剤
を注入して集塵機で処理し、この排ガスを、直接あるい
はNH3を注入した後、炭素質吸着剤が充填された吸着
器に導入して炭素質吸着剤と接触させて有害物質を除去
するとともに、排ガスの処理に供して不活化した炭素質
吸着剤を再生器で加熱再生して前記吸着器に循環させる
排ガスの処理方法であって、前記集塵機で捕集されたダ
ストを前記再生器内に供給して加熱処理するとともに、
再生器内で発生した脱離ガスを前記集塵機の上流側に戻
して処理することを特徴とする焼却炉における排ガスの
処理方法。
1. An alkaline agent is injected into exhaust gas generated from an incinerator and treated by a dust collector, and the exhaust gas is introduced directly or after injecting NH 3 into an adsorber filled with a carbonaceous adsorbent. A method for treating exhaust gas in which the harmful substance is removed by contacting with a carbonaceous adsorbent and the inactivated carbonaceous adsorbent subjected to exhaust gas treatment is heated and regenerated by a regenerator and circulated to the adsorber, Supplying the dust collected by the dust collector into the regenerator for heat treatment,
A method for treating exhaust gas in an incinerator, wherein the desorbed gas generated in the regenerator is returned to an upstream side of the dust collector for treatment.
【請求項2】 排ガスの処理に供して不活化した炭素吸
着剤と、集塵機で捕集されたダストとを、再生器に交互
に供給して処理することを特徴とする請求項1記載の焼
却炉における排ガスの処理方法。
2. The incineration according to claim 1, wherein the carbon adsorbent inactivated by treating the exhaust gas and the dust collected by the dust collector are alternately supplied to a regenerator for treatment. Exhaust gas treatment method in a furnace.
【請求項3】 焼却炉から発生する排ガスは、ボイラ/
ガス冷却装置に導入され、前記ガス冷却装置を通過して
冷却された後にアルカリ剤を注入して集塵機で処理し、
また、前記ボイラから回収されるダストも上記再生器に
供給することを特徴とする請求項1記載の焼却炉におけ
る排ガスの処理方法。
3. The exhaust gas generated from the incinerator is supplied to a boiler /
Introduced into a gas cooling device, after passing through the gas cooling device and cooled, injecting an alkaline agent and treating with a dust collector,
The method for treating exhaust gas in an incinerator according to claim 1, wherein the dust collected from the boiler is also supplied to the regenerator.
【請求項4】 再生器で発生した脱離ガスを冷却器にて
冷却した後、水銀除去装置により水銀等の揮発性重金属
を除去してから上記集塵機の上流側に戻して処理するこ
とを特徴とする請求項1記載の焼却炉における排ガスの
処理方法。
4. The method according to claim 1, wherein after the desorbed gas generated in the regenerator is cooled by a cooler, volatile heavy metals such as mercury are removed by a mercury removing device and then returned to the upstream side of the dust collector for processing. The method for treating exhaust gas in an incinerator according to claim 1.
JP9347712A 1997-12-17 1997-12-17 Waste gas treatment in incinerator Pending JPH11169662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9347712A JPH11169662A (en) 1997-12-17 1997-12-17 Waste gas treatment in incinerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9347712A JPH11169662A (en) 1997-12-17 1997-12-17 Waste gas treatment in incinerator

Publications (1)

Publication Number Publication Date
JPH11169662A true JPH11169662A (en) 1999-06-29

Family

ID=18392083

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9347712A Pending JPH11169662A (en) 1997-12-17 1997-12-17 Waste gas treatment in incinerator

Country Status (1)

Country Link
JP (1) JPH11169662A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013136059A (en) * 2013-03-28 2013-07-11 Mitsubishi Materials Corp Method and apparatus for treatment of kiln exhaust gas
JP2014171986A (en) * 2013-03-11 2014-09-22 Taiheiyo Cement Corp Method for recovering mercury in exhaust gas

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014171986A (en) * 2013-03-11 2014-09-22 Taiheiyo Cement Corp Method for recovering mercury in exhaust gas
JP2013136059A (en) * 2013-03-28 2013-07-11 Mitsubishi Materials Corp Method and apparatus for treatment of kiln exhaust gas

Similar Documents

Publication Publication Date Title
HU213649B (en) Process for the purification of the contaminated exhaust gases from incineration plants
US5405812A (en) Method and arrangement for purifying a carbon-containing adsorption medium
JPH0731847A (en) Removal of harmful substance from waste gas
CN108452663B (en) Solid waste incineration flue gas purification treatment method
HU210398B (en) Method for purifying polluted gases, in particular those from waste-incineration plants
JP3411484B2 (en) Desorption gas treatment method in exhaust gas treatment equipment of garbage incinerator
JPH05220338A (en) Treating equipment for exhaust gas of refuse incinerator
JP3411483B2 (en) Setting method of ammonia injection amount in waste gas incinerator exhaust gas treatment equipment
JP3411482B2 (en) Operating method of exhaust gas treatment device in garbage incinerator
JPH04277005A (en) Exhaust gas treatment apparatus of urban garbage incinerator
JP4531156B2 (en) Dry exhaust gas treatment method
JPH11169662A (en) Waste gas treatment in incinerator
JP4033420B2 (en) Method and apparatus for dry removal of hydrogen chloride in exhaust gas
JP3086156B2 (en) RDF incineration / exhaust gas treatment equipment
JPH07163832A (en) Treatment of exhaust gas
JPH10180038A (en) Waste gas simultaneous treating device and method thereof
JP2000015058A (en) Treatment apparatus and method for incinerator exhaust gas
JP2000015057A (en) Treatment method and apparatus for incinerator exhaust gas
JPH108118A (en) Production of desulfurizing agent for steel making from waste gas of waste incineration
JP4429404B2 (en) Dry exhaust gas treatment method and treatment apparatus
JP3459994B2 (en) Method and apparatus for regenerating adsorbent for removing harmful substances in exhaust gas
JPH11179143A (en) Method for treating exhaust gas
JP3966485B2 (en) Method and apparatus for treating exhaust gas generated during incineration of waste containing chlorine compounds
JP2001038149A (en) Device and method for treating waste gas
JP2001259370A (en) Method and apparatus for treating exhaust gas