JPH0731847A - Removal of harmful substance from waste gas - Google Patents
Removal of harmful substance from waste gasInfo
- Publication number
- JPH0731847A JPH0731847A JP5179308A JP17930893A JPH0731847A JP H0731847 A JPH0731847 A JP H0731847A JP 5179308 A JP5179308 A JP 5179308A JP 17930893 A JP17930893 A JP 17930893A JP H0731847 A JPH0731847 A JP H0731847A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- bag filter
- activated coke
- exhaust gas
- harmful substances
- 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
Landscapes
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排ガス中の有害物質除
去方法の改善に係り、より詳しくは、都市ごみや下水汚
泥等の廃棄物を焼却する焼却設備から排出される排ガス
中に含まれている各種の有害物質を低コストで、しかも
高効率で除去し得るようにした排ガス中の有害物質除去
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for removing harmful substances in exhaust gas, and more specifically, it is contained in exhaust gas discharged from an incinerator for incinerating waste such as municipal solid waste and sewage sludge. The present invention relates to a method for removing harmful substances in exhaust gas, which is capable of efficiently removing various harmful substances at low cost.
【０００２】[0002]
【従来の技術】周知のように、都市ごみや下水汚泥等の
廃棄物を焼却する焼却設備から排出される排ガス中には
各種の有害物質が含まれている。このような有害物質を
含んでいる排ガスがそのまま大気中に放出されると環境
汚染を起こすので、排ガスを大気中に放出する前に、従
来から、排ガスを排ガス処理装置に通して排ガス中の有
害物質を除去している。2. Description of the Related Art As is well known, various harmful substances are contained in exhaust gas discharged from an incinerator for incinerating waste such as municipal waste and sewage sludge. If exhaust gas containing such harmful substances is released into the atmosphere as it is, it will cause environmental pollution.Therefore, before the exhaust gas is released into the atmosphere, the exhaust gas has been conventionally passed through an exhaust gas treatment device to remove harmful substances in the exhaust gas. Material is being removed.
【０００３】例えば、特開平３−２６０６９号公報で
は、排ガス中に含まれている有害物質のうち塩化水素を
除去する塩化水素除去方法が示されている。これは、バ
グフィルタを備えた乾式の排ガス処理装置に適用される
もので、バグフィルタの入口で、消石灰または炭酸カル
シウムの粉末もしくは消石灰スラリーを吹込んで塩化水
素を中和吸収した後、反応助剤粉末を吹込んでバグフィ
ルタで捕捉し、バグフィルタの濾布面で塩化水素の中和
吸収をさらに促進させるようにしたものである。For example, Japanese Patent Application Laid-Open No. 3-26069 discloses a method for removing hydrogen chloride which removes hydrogen chloride from harmful substances contained in exhaust gas. This is applied to a dry-type exhaust gas treatment device equipped with a bag filter, in which powder of slaked lime or calcium carbonate or slaked lime slurry is blown at the inlet of the bag filter to neutralize and absorb hydrogen chloride, and then a reaction aid. The powder is blown and trapped by a bag filter, and the neutralizing absorption of hydrogen chloride is further promoted on the filter cloth surface of the bag filter.
【０００４】最近では、上記システムにおいて、塩化水
素以外の有害物質、例えば、ダイオキシン類や水銀等を
除去するために、消石灰に活性炭を添加してバグフィル
タの入口に吹込んでいる。これにより、塩化水素を除去
すると共に、ダイオキシン類や水銀の９０％以上を除去
し得るとしている。なお、バグフィルタ入口における排
ガスの温度が１５０℃である場合、消石灰に対して２〜
１０重量％の活性炭を添加している。Recently, in the above system, in order to remove harmful substances other than hydrogen chloride, such as dioxins and mercury, activated carbon is added to slaked lime and the slaked lime is blown into the inlet of the bag filter. As a result, it is possible to remove not only hydrogen chloride but also 90% or more of dioxins and mercury. In addition, when the temperature of the exhaust gas at the bag filter inlet is 150 ° C., it is 2 to slaked lime.
10% by weight of activated carbon is added.
【０００５】次に、第１３回全国都市清掃研究発表会講
演論文集（１９９２年２月，１６５〜１６７頁）におい
て、排ガス中の塩化水素（以下、ＨＣｌという），硫黄
酸化物（以下、ＳＯX という），重金属，ダイオキシン
類等の有害物質を高効率で除去する事例が示されてい
る。これは、バグフィルタの下流側に活性コークス塔を
配設する。そして、バグフィルタからこの活性コークス
塔に連通する煙道に、モル比（ＮＨ3 ／ＮＯX ）１．０
のアンモニア（ＮＨ3 ）を吹込み、このバグフィルタ入
口における排ガスの温度が１５０℃の場合に、５０％の
脱硝率と９７％以上のダイオキシン類除去率が達成され
るものである。Next, in the 13th National Urban Cleaning Research Presentation Lecture Proceedings (February 1992, pp. 165 to 167), hydrogen chloride (hereinafter referred to as HCl) and sulfur oxides (hereinafter referred to as SO) in exhaust gas. X ), heavy metals, dioxins and other harmful substances are removed with high efficiency. This places an active coke tower downstream of the bag filter. Then, a molar ratio (NH 3 / NO x ) of 1.0 was introduced from the bag filter to the flue communicating with the activated coke tower.
Ammonia (NH 3) a blowing, the temperature of the exhaust gas in the bag filter inlet in the case of 0.99 ° C., in which 50% of the NOx removal rate and 97% of the dioxin removal rate is achieved.
【０００６】また、日本機械学会（Ｎｏ．９２０−６
０）環境工学総合シンポジウム’９２講演論文集（’９
２．７．１６〜１８・川崎市）では、排ガス中の水銀，
ダイオキシン類を除去する事例が示されている。これは
消石灰供給量２〜３ｇ／ｍ3 Ｎに対して活性炭を０．０
３〜０．６５ｇ／ｍ3 Ｎの割合でバグフィルタ入口にお
ける排ガス中に噴霧することによって、活性炭でガス状
の水銀およびダイオキシン類を吸着させ、粒子状の水銀
およびダイオキシン類をバグフィルタによって捕集する
ようにしたものである。In addition, the Japan Society of Mechanical Engineers (No. 920-6
0) Environmental Engineering General Symposium '92 Proceedings ('9
(2.7.16-18, Kawasaki City), mercury in exhaust gas,
Cases of removing dioxins are shown. This is 0.03% of activated carbon for slaked lime supply 2-3 g / m 3 N.
By spraying into the exhaust gas at the bag filter inlet at a rate of 3 to 0.65 g / m 3 N, gaseous mercury and dioxins are adsorbed by the activated carbon, and particulate mercury and dioxins are collected by the bag filter. It is something that is done.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、上記従
来例で用いられる活性炭や活性コークスは高価であって
有害物質除去コストが嵩むという解決すべき課題があ
る。さらに、活性コークス塔あるいは移動層に用いられ
る活性コークスは柱状、円板状のものであって、再生費
を要し、また再生時に粉状の損失分が発生する。However, there is a problem to be solved that the activated carbon and activated coke used in the above conventional examples are expensive and the cost for removing harmful substances is high. Furthermore, the active coke used in the active coke tower or the moving bed is columnar or disc-shaped, and requires regeneration cost, and powdery loss occurs during regeneration.
【０００８】従って、本発明の目的とするところは、活
性コークス塔から発生する特に活性の高い再生活性コー
クス粉末や再生活性コークス破砕粉末を有効活用するこ
とにより、低コストで有害物質を高効率に除去し得る排
ガス中の有害物質除去方法を提供することにある。Therefore, the object of the present invention is to effectively utilize the regenerated activated coke powder and the regenerated activated coke crushed powder generated from the activated coke tower, so that harmful substances can be efficiently produced at low cost. It is to provide a method for removing harmful substances in exhaust gas that can be removed.
【０００９】[0009]
【課題を解決するための手段】本発明は、乾式の脱硫脱
硝装置で使用される石炭を主原料とする多孔質吸着剤、
つまり活性コークスを再生するに際して生じ、活性コー
クス塔から発生する特に活性の高い再生活性コークス粉
末や再生活性コークス破砕粉末を活用すれば、排ガス中
から有害物質を低コストで除去し得ると考えてなしたも
のである。The present invention provides a porous adsorbent containing coal as a main raw material, which is used in a dry desulfurization and denitration apparatus,
In other words, by utilizing regenerated activated coke powder or regenerated activated coke crushed powder, which is generated when the activated coke is regenerated and is generated from the activated coke tower, it is thought that harmful substances can be removed from exhaust gas at low cost. It was done.
【００１０】従って、本発明の請求項１に係る排ガス中
の有害物質除去方法の要旨は、都市ごみや下水汚泥等の
廃棄物を焼却する焼却炉から排出される排ガスに含まれ
ている有害物質を除去する排ガス中の有害物質除去方法
において、前記焼却炉からバグフィルタに連通する煙道
に吹込口を設け、該吹込口から煙道内に、前記バグフィ
ルタの下流側に設置した活性コークス塔あるいは活性コ
ークス移動層から発生する活性が高い再生活性コークス
粉末や再生活性コークス破砕粉末を単独あるいは消石灰
粉末と共に吹込み、これら再生活性コークス粉末あるい
は消石灰粉末等のダストをバグフィルタで回収すること
を特徴とする。Therefore, the gist of the method for removing harmful substances in exhaust gas according to claim 1 of the present invention is that the harmful substances contained in the exhaust gas discharged from the incinerator for incinerating waste such as municipal solid waste and sewage sludge. In the method of removing harmful substances in exhaust gas for removing, a blow port is provided in the flue that communicates with the bag filter from the incinerator, and from the blow port into the flue, an active coke tower installed downstream of the bag filter or It is characterized in that regenerated activated coke powder or regenerated activated coke crushed powder with high activity generated from the activated coke moving bed is blown alone or together with slaked lime powder, and dust such as these regenerated activated coke powder or slaked lime powder is collected by a bag filter. To do.
【００１１】また、本発明の請求項２に係る排ガス中の
有害物質除去方法の要旨は、都市ごみや下水汚泥等の廃
棄物を焼却する焼却炉から排出される排ガスに含まれて
いる有害物質を除去する排ガス中の有害物質除去方法に
おいて、前記焼却炉から、消石灰スラリーが噴霧される
反応塔を介してバグフィルタに連通する煙道に吹込口を
設け、該吹込口から煙道内に、前記バグフィルタの下流
側に設置した活性コークス塔あるいは活性コークス移動
層から発生する活性が高い再生活性コークス粉末や再生
活性コークス破砕粉末を吹込み、これら再生活性コーク
ス粉末と消石灰等のダストをバグフィルタで回収するこ
とを特徴とする。The gist of the method for removing harmful substances in exhaust gas according to claim 2 of the present invention is that harmful substances contained in exhaust gas discharged from an incinerator for incinerating waste such as municipal waste and sewage sludge. In the method for removing harmful substances in exhaust gas for removing, from the incinerator, a blow port is provided in a flue communicating with a bag filter through a reaction tower in which slaked lime slurry is sprayed, and the flue is blown into the flue, Regenerated activated coke powder or regenerated activated coke crushed powder that is generated from the activated coke tower or activated coke moving bed installed on the downstream side of the bag filter is blown, and the regenerated activated coke powder and dust such as slaked lime are dusted by the bag filter. It is characterized by collecting.
【００１２】また、本発明の請求項３に係る排ガス中の
有害物質除去方法の要旨は、特許請求項１，２記載の排
ガス中の有害物質除去方法において、バグフィルタで回
収したダストの一部を、再生活性コークス粉末や再生活
性コークス破砕粉末に混入して上記吹込口から煙道内に
吹込むことを特徴とする。The gist of the method for removing harmful substances in exhaust gas according to claim 3 of the present invention is that, in the method for removing harmful substances in exhaust gas according to claims 1 and 2, a part of dust collected by a bag filter. Is mixed with the regenerated activated coke powder or the regenerated activated coke crushed powder and is blown into the flue through the above-mentioned blow port.
【００１３】[0013]
【作用】本発明の請求項１，２に係る排ガス中の有害物
質除去方法によれば、再生活性コークス粉末等でダイオ
キシン類等が吸着され、ダイオキシン類を吸着した再生
活性コークス粉末等の他、重金属類、塩化水素，ＳＯX
をバグフィルタで除去することができる。また、再生活
性コークス粉末は、都市ごみや下水汚泥等の廃棄物を焼
却する焼却炉からバグフィルタに連通する煙道に吹込ま
れるので、第２従来例のような活性コークス塔単独の設
備より高効率でダイオキシン類、重金属類、ＳＯX 等が
除去され、また設置する活性コークス塔の能力を小さく
することができ、しかも再生される活性コークス粉末は
従来廃棄されているものなので、低コストである。According to the method for removing harmful substances in exhaust gas according to claims 1 and 2 of the present invention, in addition to the regenerated active coke powder in which dioxins are adsorbed by the regenerated activated coke powder and the like, Heavy metals, hydrogen chloride, SO X
Can be removed with a bug filter. In addition, regenerated activated coke powder is blown into the flue that communicates with the bag filter from the incinerator that incinerates waste such as municipal solid waste and sewage sludge. Dioxins, heavy metals, SO X, etc. can be removed with high efficiency, the capacity of the activated coke tower to be installed can be reduced, and the activated coke powder to be regenerated is conventionally discarded, so at low cost. is there.
【００１４】また、本発明の請求項３に係る排ガス中の
有害物質除去方法によれば、濾布面にダストが堆積する
とバグフィルタの通気性が劣化するので、定期的にバグ
フィルタからダストが除去されるが、除去されたダスト
中には十分活性を有する活性コークスが残存している。
そのため、これを再生活性コークス粉末に混入して吹込
口から煙道内に吹込むことによって、再生活性コークス
粉末の使用量を少なくすることができる。Further, according to the method for removing harmful substances in exhaust gas according to claim 3 of the present invention, since dust is accumulated on the surface of the filter cloth, the air permeability of the bag filter is deteriorated. Although removed, activated coke having sufficient activity remains in the removed dust.
Therefore, the amount of the regenerated activated coke powder used can be reduced by mixing the regenerated activated coke powder into the flue gas through the blowing port.
【００１５】[0015]
【実施例】以下、本発明の実施例に係る排ガス中の有害
物質除去方法を、この有害物質除去方法を実現する乾式
の排ガス処理装置の主要部模式図の図１と、バグフィル
タ入口における排ガス温度が１４０〜２００℃である場
合の排ガス量に対する活性コークス割合によるダイオキ
シン類と水銀濃度説明図の図２，図３と、バグフィルタ
で捕集した捕集物のリサイクル割合と活性コークス使用
量の関係説明図の図４とを参照しながら説明する。EXAMPLE A method for removing harmful substances from exhaust gas according to an embodiment of the present invention will be described below with reference to FIG. 1 which is a schematic diagram of a main part of a dry type exhaust gas treatment apparatus for realizing this method, and exhaust gas at a bag filter inlet. Fig. 2 and Fig. 3 which are diagrams for explaining dioxin and mercury concentrations depending on the ratio of active coke to the amount of exhaust gas when the temperature is 140 to 200 ° C, and the recycling ratio of the collected matter collected by the bag filter and the amount of active coke used. This will be described with reference to FIG. 4 of the relationship explanatory diagram.
【００１６】即ち、図１に示す符号１は、都市ごみある
いは下水汚泥等の廃棄物を焼却する焼却炉（図示省略）
から排出される排ガスを処理する排ガス処理装置１であ
り、これは主としてガス冷却器５、バグフィルタ６、活
性コークス塔７とからなっている。詳しくは、ガス冷却
器５には、焼却炉（図示省略）から、排ガスの熱を有効
活用するために排ガスの熱を回収する廃熱ボイラ（図示
省略）等が介装されてなる上流煙道２が連通し、ガス冷
却器５からバグフィルタ６には、消石灰粉末と活性コー
クスとを吹込む、後述する吹込ダクト１１が接続される
吹込口３ａを有する中間煙道３が連通している。さら
に、バグフィルタ６から誘引送風機１２には、活性コー
クス塔７が介装されてなる排出煙道４が連通している。
従って、焼却炉から排出された排ガスは、誘引送風機１
２により吸引されて、上流煙道２→ガス冷却器５→中間
煙道３→バグフィルタ６→活性コークス塔７をとおり、
煙突（図示省略）から大気中に放出されることとなる。That is, reference numeral 1 shown in FIG. 1 indicates an incinerator (not shown) for incinerating waste such as municipal waste or sewage sludge.
The exhaust gas treatment apparatus 1 treats the exhaust gas discharged from the exhaust gas, which mainly comprises a gas cooler 5, a bag filter 6, and an activated coke tower 7. Specifically, in the gas cooler 5, an upstream flue is provided with a waste heat boiler (not shown) for recovering the heat of the exhaust gas from the incinerator (not shown) in order to effectively use the heat of the exhaust gas. 2 communicates with the bag filter 6 from the gas cooler 5 and communicates with the intermediate flue 3 having a blow-in port 3a for blowing in slaked lime powder and activated coke to which a blow-in duct 11 described later is connected. Further, an exhaust flue 4 in which an active coke tower 7 is interposed communicates with the bag filter 6 and the induction blower 12.
Therefore, the exhaust gas discharged from the incinerator is the induced blower 1
2 is sucked by, and passes through the upstream flue 2, the gas cooler 5, the intermediate flue 3, the bag filter 6, and the activated coke tower 7,
It will be released into the atmosphere from a chimney (not shown).
【００１７】一方、活性コークス塔７の下方には、活性
コークス塔７から供給される活性コークスを再生する再
生装置８、再生装置８で再生された再生活性コークス
（以下、活性コークスという）を分級する分級装置９が
設けられている。そして、分級装置９で分級された所定
の粒度の活性コークス粉末は、消石灰粉末が吹込まれる
吹込ダクト１１を介して前記吹込口３ａに吹込まれるよ
うになっている。さらに、分級装置９から活性コークス
塔７には、吹込みに使用しない活性コークス、つまり、
柱状や円板状の正常な活性コークスをこの活性コークス
塔７に戻す循環ダクト１０が連通している。On the other hand, below the active coke tower 7, a regenerator 8 for regenerating the active coke supplied from the active coke tower 7 and a regenerated active coke regenerated by the regenerator 8 (hereinafter referred to as active coke) are classified. A classification device 9 is provided. Then, the activated coke powder having a predetermined particle size that has been classified by the classifying device 9 is blown into the blow-in port 3a through the blow-in duct 11 into which the slaked lime powder is blown. Furthermore, from the classifier 9 to the activated coke tower 7, activated coke not used for blowing, that is,
A circulation duct 10 for returning normal columnar or disk-shaped activated coke to the activated coke tower 7 is in communication therewith.
【００１８】なお、この実施例では消石灰粉末と活性コ
ークス粉末とが吹込口３ａから中間煙道３に吹込まれる
ようになっているが、同図中破線で示すように、上流煙
道２に吹込むようにしても良く、また、煙道の２か所に
吹込口を設けて、それぞれの吹込口から消石灰粉末と活
性コークスとを単独で吹込むようにしても良い。In this embodiment, the slaked lime powder and the activated coke powder are blown into the intermediate flue 3 from the blow-in port 3a. Blowing may be performed, or blowing holes may be provided at two positions of the flue, and the slaked lime powder and the activated coke may be blown individually from the respective blowing ports.
【００１９】以下、上記構成になる排ガス処理装置１の
使用態様を説明すると、中間煙道３の吹込口３ａから中
間煙道３を流れている排ガス中に、ＨＣｌを中和する消
石灰粉末と、この消石灰粉末量に対して図２，３に示す
割合で、乾式の脱硫脱硝装置で使用される石炭を主原料
とする多孔質の活性コークスを再生するに際して生じる
未活用の活性コークス粉末とが吹込まれる。The usage of the exhaust gas treating apparatus 1 having the above structure will be described below. Slaked lime powder for neutralizing HCl in the exhaust gas flowing from the blow-in port 3a of the intermediate flue 3 through the intermediate flue 3, At a ratio shown in FIGS. 2 and 3 with respect to the amount of slaked lime powder, the amount of unused active coke powder generated when regenerating the porous active coke mainly composed of coal used in the dry desulfurization and denitration equipment is blown. Get caught.
【００２０】ところで、図２、図３は、縦軸にバグフィ
ルタ出口のダイオキシン類、および水銀濃度（ｍｇ／ｍ
3 Ｎ）を、横軸にバグフィルタの入口温度、つまり集じ
ん温度（℃）をとって示したものであるが、これらの図
２、図３によれば、排ガス量に対して０．１ｇ／ｍ3 Ｎ
の割合で活性コークス粉末を中間煙道３内に吹込むと、
ダイオキシン類、水銀等の重金属類が共に効果的に除去
されることが良く理解される。つまり、バグフィルタ６
によって煤じん等のダストと共に活性コークス粉末が捕
捉され、捕捉されたダスト層によってダイオキシン類、
水銀等の重金属類が吸着される。勿論、ＨＣｌは、従来
例に示されているように、消石灰によって中和されると
共にバグフィルタ６によって捕捉されることとなる。2 and 3, the vertical axis represents the dioxins at the bag filter outlet and the mercury concentration (mg / m).
3 N) is shown by plotting the inlet temperature of the bag filter, that is, the dust collection temperature (° C.) on the horizontal axis. According to these FIG. 2 and FIG. / M 3 N
When activated coke powder is blown into the intermediate flue 3 at a ratio of
It is well understood that heavy metals such as dioxins and mercury are effectively removed together. In other words, bug filter 6
Activated coke powder is captured along with dust such as soot and dust by the captured dust layer,
Heavy metals such as mercury are adsorbed. Of course, HCl is neutralized by slaked lime and captured by the bag filter 6, as shown in the conventional example.
【００２１】また、従来から活性コークス塔および移動
塔のみの場合では、活性コークス塔出口のダイオキシン
類を低減させるために、これら装置はＳＶ５００〜２０
００ｈと比較的大きなものとなっているが、バグフィル
タの上流側に活性コークス粉末を吹込めば、図２に示す
ように、バグフィルタ出口におけるダイオキシン類濃度
を２０〜３０ｎｇ／ｍ3 Ｎまで低減することができるの
で、バグフィルタ６の下流側の活性コークス塔７あるい
は移動塔等の装置の小型化が可能になるだけでなく、活
性コークスの使用量の削減にもつながる。Further, in the conventional case where only the active coke tower and the moving tower are used, in order to reduce the dioxins at the outlet of the active coke tower, these devices are SV500-20.
However, if activated coke powder is blown into the upstream side of the bag filter, the concentration of dioxins at the bag filter outlet is reduced to 20 to 30 ng / m 3 N as shown in FIG. Therefore, not only can the apparatus such as the active coke tower 7 or the moving tower on the downstream side of the bag filter 6 be downsized, but also the amount of active coke used can be reduced.
【００２２】ところで、バグフィルタ６によって捕捉さ
れたダストは、減容化や無害化のために例えば溶融・固
化処理されるが、捕捉されたダストの一部をリサイクル
すると添加量の増加につながり一層高効率で除去できる
効果があり、ひいては有害物質の除去コストの削減に寄
与し得ることが判った。例えば、図４に示すように、活
性コークスに３０重量％のダストを混入すると、活性コ
ークスのみでは１００重量％を必要とするのに対して約
３０重量％で良く、活性コークス投入量が大幅に削減さ
れる。このことは、濾布面にダストが堆積するとバグフ
ィルタの通気性が劣化するので、定期的にバグフィルタ
からダストが除去されるが、この除去されるダスト中に
は十分活性を有する活性コークスが残存しているという
ことから良く理解される。By the way, the dust captured by the bag filter 6 is, for example, melted and solidified in order to reduce the volume and render it harmless. However, recycling a part of the captured dust leads to an increase in the amount of addition. It has been found that there is an effect that it can be removed with high efficiency, which in turn can contribute to the reduction of the cost of removing harmful substances. For example, as shown in FIG. 4, when 30% by weight of dust is mixed in the activated coke, about 30% by weight is sufficient as compared with 100% by weight of the activated coke alone. Be reduced. This means that if dust accumulates on the surface of the filter cloth, the air permeability of the bag filter deteriorates, so dust is regularly removed from the bag filter, but activated coke having sufficient activity is contained in the removed dust. It is well understood that it remains.
【００２３】次に、本発明に係る他の実施例を、この有
害物質除去方法を実現する半乾式の排ガス処理装置の主
要部模式図の図５を参照しながら、上記実施例と同一の
もの並びに同一機能を有するものを同一符号を以て以下
に説明すると、図５に示す符号１は、焼却炉（図示省
略）から排出される排ガスを処理する排ガス処理装置１
であって、この排ガス処理装置１は、主として上部から
消石灰スラリーが噴霧されることにより排ガスを冷却す
る排ガス冷却機能と、排ガス中のＨＣｌを中和するＨＣ
ｌ中和機能とを有する反応塔５、バグフィルタ６、活性
コークス塔７とからなっている。Next, another embodiment according to the present invention, which is the same as the above embodiment, will be described with reference to FIG. 5 which is a schematic view of a main part of a semi-dry type exhaust gas treating apparatus which realizes this harmful substance removing method. Further, those having the same function will be described below with the same reference numerals. The reference numeral 1 shown in FIG. 5 indicates an exhaust gas treatment apparatus 1 for treating exhaust gas discharged from an incinerator (not shown).
The exhaust gas treating apparatus 1 has an exhaust gas cooling function for cooling the exhaust gas mainly by spraying the slaked lime slurry from above, and an HC for neutralizing HCl in the exhaust gas.
It comprises a reaction tower 5 having a neutralization function, a bag filter 6, and an activated coke tower 7.
【００２４】詳しくは、反応塔５には、焼却炉（図示省
略）から、排ガスの熱を有効活用するために排ガスの熱
を回収する廃熱ボイラ（図示省略）等が介装されてなる
上流煙道２が連通し、反応塔５からバグフィルタ６に
は、消石灰粉末と活性コークスとを吹込む、後述する吹
込ダクト１１が接続される吹込口３ａを有する中間煙道
３が連通している。さらに、バグフィルタ６から誘引送
風機１２には、活性コークス塔７が介装されてなる排出
煙道４が連通している。More specifically, the reaction tower 5 is provided with an exhaust heat boiler (not shown) for recovering the heat of the exhaust gas from an incinerator (not shown) in order to effectively utilize the heat of the exhaust gas. The flue 2 communicates with the bag filter 6 from the reaction tower 5 with an intermediate flue 3 having a blowing port 3a for blowing slaked lime powder and activated coke to which a blowing duct 11 described later is connected. . Further, an exhaust flue 4 in which an active coke tower 7 is interposed communicates with the bag filter 6 and the induction blower 12.
【００２５】一方、活性コークス塔７の下方には、活性
コークス塔７から供給される活性コークスを再生する再
生装置８、再生装置８で再生された活性コークスを分級
する分級装置９が設けられている。そして、分級装置９
で分級された所定の粒度の活性コークス粉末は、消石灰
粉末が吹込まれる吹込ダクト１１を介して前記吹込口３
ａに吹込まれるようになっている。さらに、分級装置９
から活性コークス塔７には、吹込みに使用しない正常な
活性コークスをこの活性コークス塔７に戻す循環ダクト
１０が連通している。つまり、以上の説明から良く理解
されるように、本実施例が上記実施例と相違するところ
は、ガス冷却器を反応塔に置換したところにある。On the other hand, below the active coke tower 7, there are provided a regenerator 8 for regenerating the active coke supplied from the active coke tower 7, and a classifying device 9 for classifying the active coke regenerated by the regenerator 8. There is. And the classifying device 9
The activated coke powder having a predetermined particle size, which has been classified by the above, is blown into the blowing port 3 through the blowing duct 11 into which the slaked lime powder is blown.
It is designed to be blown into a. Furthermore, the classification device 9
Therefore, the activated coke tower 7 is communicated with a circulation duct 10 for returning normal activated coke, which is not used for blowing, to the activated coke tower 7. That is, as is well understood from the above description, the difference between this embodiment and the above embodiment is that the gas cooler is replaced with a reaction tower.
【００２６】勿論、上記実施例と同様に、消石灰粉末と
活性コークス粉末とが吹込口３ａから中間煙道３に吹込
まれるようになっているが、同図中破線で示すように、
上流煙道２に吹込むようにしても良く、また、煙道の２
か所に吹込口を設け、それぞれの吹込口から消石灰粉末
と活性コークスとを単独で吹込むようにしても良い。従
って、吹込口３ａから中間煙道３内に活性コークスある
いは活性コークスと消石灰とが吹込まれるので、本実施
例は上記実施例と同効である。Of course, as in the above embodiment, the slaked lime powder and the activated coke powder are blown into the intermediate flue 3 through the blow-in port 3a, but as shown by the broken line in the figure,
It may be blown into the upstream flue 2 or the flue 2
Blowing ports may be provided at different locations, and the slaked lime powder and the activated coke may be blown into each of the blowing ports independently. Therefore, activated coke or activated coke and slaked lime are blown into the intermediate flue 3 from the blowing port 3a, and this embodiment has the same effect as the above embodiment.
【００２７】[0027]
【発明の効果】以上述べたように、本発明の請求項１，
２に係る有害物質除去方法によれば、バグフィルタでダ
ストと共に活性コークス粉末が捕捉され、捕捉されたダ
ストでダイオキシン類、水銀等の重金属が吸着されるた
め、活性コークス塔単独の装置よりも高効率でダイオキ
シン類、水銀等の重金属類、ＳＯX を除去することがで
き、しかも、活性コークス粉末は従来廃棄される低コス
トのものであるため、有害物質除去コストの削減に対し
て極めて多大な効果がある。さらに、請求項３に係る有
害物質除去方法によれば、活性コークスの使用量を少な
くすることができるので、有害物質除去コストの削減に
対してより一層効果的である。As described above, the claims 1 and 2 of the present invention are as follows.
According to the method for removing harmful substances according to 2, the bag filter captures the active coke powder along with the dust, and the captured dust adsorbs heavy metals such as dioxins and mercury, so that it is higher than the device of the active coke tower alone. Efficiently removes dioxins, heavy metals such as mercury, and SO X. Moreover, since activated coke powder is a low-cost product that is conventionally discarded, it is extremely important to reduce the cost of removing harmful substances. effective. Furthermore, according to the harmful substance removing method of the third aspect of the present invention, the amount of active coke used can be reduced, which is even more effective in reducing the harmful substance removing cost.
【図１】本発明の実施例に係る排ガス中の有害物質除去
方法を実現する乾式の排ガス処理装置の主要部模式図で
ある。FIG. 1 is a schematic diagram of a main part of a dry-type exhaust gas treatment apparatus that realizes a method for removing harmful substances in exhaust gas according to an embodiment of the present invention.
【図２】バグフィルタ入口における排ガス温度が１４０
〜２００℃である場合の排ガス量に対する活性コークス
割合によるダイオキシン類濃度説明図である。[Fig. 2] Exhaust gas temperature at the bag filter inlet is 140
It is a dioxin density | concentration explanatory view by the active coke rate with respect to the amount of exhaust gas in case of -200 degreeC.
【図３】バグフィルタ入口における排ガス温度が１４０
〜２００℃である場合の排ガス量に対する活性コークス
割合による水銀濃度説明図である。[Fig. 3] Exhaust gas temperature at the bag filter inlet is 140
It is a mercury concentration explanatory view by the ratio of active coke to the amount of exhaust gas in the case of ~ 200 ℃.
【図４】バグフィルタで捕集した捕集物のリサイクル割
合と活性コークス使用量の関係説明図である。FIG. 4 is a diagram for explaining the relationship between the recycling rate of the collected material collected by the bag filter and the amount of active coke used.
【図５】本発明の他の実施例に係る排ガス中の有害物質
除去方法を実現する半乾式の排ガス処理装置の主要部模
式図である。FIG. 5 is a schematic view of a main part of a semi-dry type exhaust gas treatment apparatus that realizes a method for removing harmful substances in exhaust gas according to another embodiment of the present invention.
１…排ガス処理装置、２…上流煙道、３…中間煙道、３
ａ…吹込口、４…排出煙道、５…ガス冷却器または反応
塔、６…バグフィルタ、７…活性コークス塔、８…再生
装置、９…分級装置、１０…循環ダクト、１１…吹込ダ
クト、１２…誘引送風機。1 ... Exhaust gas treatment device, 2 ... Upstream flue, 3 ... Intermediate flue, 3
a ... Inlet, 4 ... Exhaust flue, 5 ... Gas cooler or reaction tower, 6 ... Bag filter, 7 ... Activated coke tower, 8 ... Regeneration device, 9 ... Classifying device, 10 ... Circulation duct, 11 ... Blowing duct , 12 ... Induction blower.
───────────────────────────────────────────────────── 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 53/81 53/70 53/64 Ｂ０１Ｄ 53/34 １２４ Ｚ １３４ Ｅ １３６ Ａ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI Technical display location B01D 53/81 53/70 53/64 B01D 53/34 124 Z Z 134 E 136 A
Claims (3)
る焼却炉から排出される排ガスに含まれている有害物質
を除去する排ガス中の有害物質除去方法において、前記
焼却炉からバグフィルタに連通する煙道に吹込口を設
け、該吹込口から煙道内に、前記バグフィルタの下流側
に設置した活性コークス塔あるいは活性コークス移動層
から発生する活性が高い再生活性コークス粉末や再生活
性コークス破砕粉末を単独あるいは消石灰粉末と共に吹
込み、これら再生活性コークス粉末あるいは消石灰粉末
等のダストをバグフィルタで回収することを特徴とする
排ガス中の有害物質除去方法。1. A method for removing harmful substances contained in exhaust gas discharged from an incinerator that incinerates waste such as municipal solid waste and sewage sludge, wherein the bag filter is removed from the incinerator. A blowing port is provided in the communicating flue, and a regenerated activated coke powder or regenerated activated coke crushed with high activity generated from an activated coke tower or an activated coke moving bed installed downstream of the bag filter into the flue from the blowing port. A method for removing harmful substances in exhaust gas, comprising injecting powder alone or together with slaked lime powder and recovering dust such as regenerated activated coke powder or slaked lime powder with a bag filter.
る焼却炉から排出される排ガスに含まれている有害物質
を除去する排ガス中の有害物質除去方法において、前記
焼却炉から、消石灰スラリーが噴霧される反応塔を介し
てバグフィルタに連通する煙道に吹込口を設け、該吹込
口から煙道内に、前記バグフィルタの下流側に設置した
活性コークス塔あるいは活性コークス移動層から発生す
る活性が高い再生活性コークス粉末や再生活性コークス
破砕粉末を吹込み、これら再生活性コークス粉末と消石
灰等のダストをバグフィルタで回収することを特徴とす
る排ガス中の有害物質除去方法。2. A method for removing harmful substances contained in exhaust gas discharged from an incinerator for incinerating waste such as municipal waste and sewage sludge, wherein slaked lime slurry is discharged from the incinerator. Is provided in the flue that communicates with the bag filter through the reaction tower through which is sprayed, and from the blower into the flue, an active coke tower or an active coke moving bed installed downstream of the bag filter is generated. A method for removing harmful substances in exhaust gas, which comprises injecting highly active regenerated activated coke powder or regenerated activated coke crushed powder and collecting the regenerated activated coke powder and dust such as slaked lime with a bag filter.
を、再生活性コークス粉末や再生活性コークス破砕粉末
に混入して上記吹込口から煙道内に吹込むことを特徴と
する特許請求項１，２記載の排ガス中の有害物質除去方
法。3. A part of the dust collected by the bag filter is mixed with regenerated activated coke powder or regenerated activated coke crushed powder and blown into the flue through the blowing port. A method for removing harmful substances in exhaust gas as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17930893A JP3207019B2 (en) | 1993-07-20 | 1993-07-20 | How to remove harmful substances in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17930893A JP3207019B2 (en) | 1993-07-20 | 1993-07-20 | How to remove harmful substances in exhaust gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0731847A true JPH0731847A (en) | 1995-02-03 |
| JP3207019B2 JP3207019B2 (en) | 2001-09-10 |
Family
ID=16063564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17930893A Expired - Lifetime JP3207019B2 (en) | 1993-07-20 | 1993-07-20 | How to remove harmful substances in exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3207019B2 (en) |
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| JPH08108040A (en) * | 1994-08-17 | 1996-04-30 | Okutama Kogyo Kk | Waste gas processing agent and treatment of waste gas |
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| JPH0929046A (en) * | 1995-07-21 | 1997-02-04 | Kubota Corp | Exhaust gas treatment using adsorbent |
| JPH09234333A (en) * | 1996-03-01 | 1997-09-09 | Kawasaki Heavy Ind Ltd | Method for dry treatment of exhaust gas and apparatus therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0775718A (en) * | 1993-09-09 | 1995-03-20 | Takuma Co Ltd | Method for simultaneously removing heavy metal, chlorinated hydrocarbon and acidic gas in waste gas |
| JPH08108040A (en) * | 1994-08-17 | 1996-04-30 | Okutama Kogyo Kk | Waste gas processing agent and treatment of waste gas |
| JPH0914633A (en) * | 1995-06-23 | 1997-01-17 | Kubota Corp | Gas treating device |
| JPH0929046A (en) * | 1995-07-21 | 1997-02-04 | Kubota Corp | Exhaust gas treatment using adsorbent |
| JPH09234333A (en) * | 1996-03-01 | 1997-09-09 | Kawasaki Heavy Ind Ltd | Method for dry treatment of exhaust gas and apparatus therefor |
| JPH09248425A (en) * | 1996-03-18 | 1997-09-22 | Takuma Co Ltd | Dioxine removing material, dioxine removing method, exhaust gas treatment equipment and dioxine removing material-regenerating method |
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| JPH10216463A (en) * | 1997-01-31 | 1998-08-18 | Nkk Corp | Spraying method of slaked lime and adsorbent and device therefor |
| JPH10216476A (en) * | 1997-01-31 | 1998-08-18 | Kawasaki Heavy Ind Ltd | Waste gas treatment and apparatus therefor |
| WO1998048924A1 (en) * | 1997-04-25 | 1998-11-05 | Nkk Corporation | Method of treating exhaust gas |
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