JP3353772B2 - Dioxin treatment method for wet smoke tower - Google Patents
Dioxin treatment method for wet smoke towerInfo
- Publication number
- JP3353772B2 JP3353772B2 JP2000047610A JP2000047610A JP3353772B2 JP 3353772 B2 JP3353772 B2 JP 3353772B2 JP 2000047610 A JP2000047610 A JP 2000047610A JP 2000047610 A JP2000047610 A JP 2000047610A JP 3353772 B2 JP3353772 B2 JP 3353772B2
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- concentration
- dioxin
- activated carbon
- smoke
- wet
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は湿式洗煙塔のダイオ
キシン類処理方法に係り、特に、湿式洗煙塔を有する焼
却炉において、湿式洗煙塔に活性炭を添加して湿式洗煙
塔から排出される排ガス中に含まれるポリ塩化−ｐ−ジ
ベンゾダイオキシン類（ＰＣＤＤ）やポリ塩化ジベンゾ
フラン類（ＰＣＤＦ）、ポリ塩化ビフェニル（ＰＣＢ）
等の有機塩素化合物（以下、これらを併せて「ダイオキ
シン類」と称す。）を除去するに当たり、湿式洗煙塔に
添加する活性炭量を最適化して、処理効率の向上、処理
コストの低減を図る方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating dioxins in a wet smoke tower, and more particularly, to an incinerator having a wet smoke tower, adding activated carbon to the wet smoke tower and discharging it from the wet smoke tower. -P-dibenzodioxins (PCDD), polychlorinated dibenzofurans (PCDF), and polychlorinated biphenyls (PCB) contained in waste gas
In removing organic chlorine compounds (hereinafter, these are collectively referred to as "dioxins"), the amount of activated carbon added to the wet smoke tower is optimized to improve the processing efficiency and reduce the processing cost. About the method.
【０００２】[0002]
【従来の技術】ごみ焼却炉等の焼却炉においては、燃焼
中に、フェノール、ベンゼン、アセチレン等の有機化合
物、クロロフェノール、クロロベンゼン等の塩素化芳香
族化合物や塩素化アルキル化合物等のダイオキシン類前
駆体が発生する。これらのダイオキシン類前駆体は、飛
灰が共存するとその触媒作用でダイオキシン類となって
焼却灰や排ガス中に存在することとなるため、従来、焼
却灰や排ガス中のダイオキシン類の除去方法について、
多くの提案がなされている。BACKGROUND OF THE INVENTION In incinerators such as refuse incinerators, during combustion, organic compounds such as phenol, benzene, and acetylene; chlorinated aromatic compounds such as chlorophenol and chlorobenzene; and dioxin precursors such as chlorinated alkyl compounds. The body develops. Since these dioxin precursors become dioxins due to their catalytic action when fly ash coexists and are present in incinerated ash and exhaust gas, conventionally, a method for removing dioxins in incinerated ash and exhaust gas has been described.
Many suggestions have been made.
【０００３】また、ごみ焼却炉等においては、被焼却物
中に混入した塩化ビニル系プラスチック、塩化ナトリウ
ムや塩化カルシウム等の水溶性塩素、塩化ビニル以外の
有機塩素類の燃焼により大量の塩化水素（ＨＣｌ）が発
生し、大気汚染、金属腐食の原因となることから、排ガ
ス中のＨＣｌを除去するための処理設備が設けられてい
る。このＨＣｌの除去方法としては、焼却炉からの排ガ
スに煙道にてアルカリ剤（通常は消石灰）を吹き込み、
中和生成物を飛灰と共に回収する乾式ないし半乾式方式
と、焼却炉からの排ガスを湿式洗煙塔に導き、湿式洗煙
塔にて排ガスに洗煙水としてアルカリ水（通常は水酸化
ナトリウム水溶液）を散布してアルカリ水中にＨＣｌを
吸収する湿式方式とがある。湿式方式は乾式方式に比べ
て、排水処理が必要であるという難点があることから、
現状にて湿式洗煙塔が採用されている焼却設備は少ない
が、気−固反応の乾式方式に比べて、気−液反応である
ため、反応効率が良く、集塵器からの飛灰の排出量が少
なく、また、排ガスのＨＣｌ濃度を１０ｐｐｍ以下に抑
制できるという利点があり、今後の拡充が期待される。In a refuse incinerator or the like, a large amount of hydrogen chloride is produced by burning vinyl chloride-based plastics, water-soluble chlorine such as sodium chloride and calcium chloride, and organic chlorines other than vinyl chloride mixed in the incineration material. HCl) is generated and causes air pollution and metal corrosion. Therefore, a treatment facility for removing HCl in exhaust gas is provided. As a method for removing HCl, an alkaline agent (usually slaked lime) is blown into the exhaust gas from the incinerator through a flue,
Dry or semi-dry method to collect the neutralized product together with fly ash, and guide the flue gas from the incinerator to the wet smoke tower, and add alkaline water (usually sodium hydroxide) as flue water to the flue gas in the wet smoke tower. Aqueous solution) to absorb HCl in alkaline water. The wet method has the disadvantage of requiring wastewater treatment compared to the dry method,
At present, there are few incinerators that use wet smoke washing towers.However, compared to the dry method of gas-solid reaction, the gas-liquid reaction has a higher reaction efficiency, and the fly ash from the dust collector is better. There is an advantage that the emission amount is small and the HCl concentration of the exhaust gas can be suppressed to 10 ppm or less, and further expansion is expected.
【０００４】湿式洗煙塔は多くの場合、排ガス処理工程
の最終段階に設けられ、この湿式洗煙塔の出口排ガスの
ダイオキシン類濃度が、規制対象である煙突排ガスのダ
イオキシン類濃度に大きな影響を与えている。また、ダ
イオキシン類は疎水性であるため、湿式洗煙塔内部のゴ
ム又は樹脂ランニングやプラスチック充填材に洗煙水を
介して吸脱着することがあり、湿式洗煙塔で排ガスのダ
イオキシン類濃度が増加することが知られている。[0004] Wet smoke washing towers are often provided at the final stage of an exhaust gas treatment process, and the concentration of dioxins in the exhaust gas at the outlet of the wet smoke washing tower has a great effect on the concentration of dioxins in the chimney exhaust gas to be regulated. Have given. In addition, since dioxins are hydrophobic, they may be adsorbed and desorbed to the rubber or resin running or plastic filler inside the wet-type smoke cleaning tower through the smoke-washing water. It is known to increase.
【０００５】従来、排ガス中のダイオキシン類の除去方
法として、活性炭を用いることが知られており、例え
ば、湿式洗煙塔内の洗煙水に粉末活性炭を懸濁させるこ
とによって、洗煙塔内に蓄積されたダイオキシン類を除
去し、排ガス中のダイオキシン類濃度を低下させる事例
が報告されている (Chemosphere 32: 159-168 (199
6))。Conventionally, it has been known to use activated carbon as a method of removing dioxins from exhaust gas. For example, powdered activated carbon is suspended in smoke water in a wet-type smoke tower to form a powder in the smoke tower. It has been reported that dioxins accumulated in coal are removed and the concentration of dioxins in exhaust gas is reduced (Chemosphere 32: 159-168 (199
6)).
【０００６】[0006]
【発明が解決しようとする課題】上記文献では、湿式洗
煙塔への活性炭添加量は洗煙水に対して１〜６０ｇ／Ｌ
ないしは洗煙塔手前の煙道の排ガスに対して３０〜１５
０ｍｇ／Ｎｍ３の範囲とされているが、この添加量は経
験的に決められており、科学的な解析を活かした制御を
受けていない。In the above document, the amount of activated carbon added to a wet smoke tower is 1 to 60 g / L based on the amount of smoke water.
Or 30 to 15 for exhaust gas from the flue just before the smoke washing tower.
Although it is in the range of 0 mg / Nm 3, the amount of addition is determined empirically, and is not controlled by utilizing scientific analysis.
【０００７】このため、実焼却炉の適用に当たっては、
湿式洗煙塔の仕様や運転条件、ダイオキシン類の発生状
況に係わりなく、ダイオキシン類の残留を極力低減する
ために、過剰量の活性炭が使用されており、ダイオキシ
ン処理コストが高騰する傾向にある。For this reason, in applying the actual incinerator,
Irrespective of the specifications and operating conditions of the wet-type smoke washing tower and the state of generation of dioxins, an excessive amount of activated carbon is used to minimize the residual dioxins, and the cost of dioxin treatment tends to increase.
【０００８】本発明は上記従来の問題点を解決し、湿式
洗煙塔に活性炭を添加してダイオキシン類を除去するに
当たり、添加する活性炭量を最適化して、低コストで効
率的な処理を行う方法を提供することを目的とする。[0008] The present invention solves the above-mentioned conventional problems, and optimizes the amount of activated carbon to be added to remove dioxins by adding activated carbon to a wet smoke tower, thereby performing low-cost and efficient treatment. The aim is to provide a method.
【０００９】[0009]
【課題を解決するための手段】請求項１の湿式洗煙塔の
ダイオキシン類処理方法は、湿式洗煙塔に活性炭を添加
してダイオキシン類を除去する方法において、湿式洗煙
塔の入口ガス及び出口ガスのダイオキシン類濃度又はダ
イオキシン類前駆体濃度を測定し、それらの測定値に基
づいて添加する活性炭量を設定する湿式洗煙塔のダイオ
キシン類処理方法であって、処理開始時において、該湿
式洗煙塔の活性炭保持濃度を設定し、処理開始後、入口
ガスのダイオキシン類濃度又はダイオキシン類前駆体濃
度＜出口ガスのダイオキシン類濃度又はダイオキシン類
前駆体濃度となっている期間は、該処理開始時の活性炭
保持濃度を維持し、その後、入口ガスのダイオキシン類
濃度又はダイオキシン類前駆体濃度≒出口ガスのダイオ
キシン類濃度又はダイオキシン類前駆体濃度となった時
点で活性炭保持濃度を処理開始時よりも１０〜２０％低
減し、更に、入口ガスのダイオキシン類濃度又はダイオ
キシン類前駆体濃度よりも出口ガスのダイオキシン類濃
度又はダイオキシン類前駆体濃度が２０〜４０％程度低
くなった時点で活性炭保持濃度を処理開始時よりも２０
〜４０％少ない量とすることを特徴とする。According to a first aspect of the present invention, there is provided a method for treating dioxins in a wet smoke tower, which comprises adding activated carbon to the wet smoke tower to remove dioxins. measuring the dioxins concentration or dioxin precursors concentration in the outlet gas, diode wet wash smoke column for setting the activated carbon amount to be added based on those measurements
A method for treating toxins, the method comprising:
Set the activated carbon retention concentration of the smoke-cleaning tower, and after the treatment starts,
Dioxin concentration or dioxin precursor concentration in gas
Degree <dioxin concentration or dioxin in outlet gas
During the period of the precursor concentration, the activated carbon at the start of the treatment
Maintain the retention concentration and then dioxins in the inlet gas
Concentration or dioxin precursor concentration divided by exit gas
When the concentration of xins or dioxin precursors is reached
10-20% lower than at the start of treatment
In addition, the dioxin concentration in the inlet gas or
Dioxin concentration in outlet gas rather than xin precursor concentration
Degree or dioxin precursor concentration is low by about 20-40%
At the time when it became low, the activated carbon retention concentration was 20
It is characterized in that the amount is reduced by ４０40% .
【００１０】請求項２の湿式洗煙塔のダイオキシン類処
理方法は、湿式洗煙塔に活性炭を添加してダイオキシン
類を除去する方法において、湿式洗煙塔の洗煙排水中又
は循環水中のダイオキシン類濃度又はダイオキシン類前
駆体濃度を測定し、その測定値に基づいて添加する活性
炭量を設定する湿式洗煙塔のダイオキシン類処理方法で
あって、処理開始時において、該湿式洗煙塔の活性炭保
持濃度を設定し、処理開始後、処理前に比べて洗煙排水
中又は循環水中のダイオキシン類濃度又はダイオキシン
類前駆体濃度が高くなった後、洗煙排水中又は循環水中
のダイオキシン類濃度又はダイオキシン類前駆体濃度が
減少を始めた時点で、活性炭保持濃度を処理開始時より
も２０〜４０％低減することを特徴とする。The method for treating dioxins in a wet smoke tower according to claim 2 is a method for removing dioxins by adding activated carbon to the wet smoke tower, wherein the dioxin is contained in the waste water of the wet smoke tower or in the circulating water. in class concentration or dioxins precursors concentration was determined, dioxins processing method of a wet wash smoke column for setting the activated carbon amount to be added based on the measurement value
Therefore, at the beginning of the treatment, activated carbon storage
After setting the concentration, set the smoke concentration and drain the smoke compared to before the treatment.
Of dioxins in water or circulating water or dioxin
After the precursor concentration has increased, the wastewater is discharged in smoke or circulating water.
Dioxin concentration or dioxin precursor concentration
When the reduction starts, the activated carbon retention concentration is
Is also reduced by 20 to 40% .
【００１１】前述の如く、ダイオキシン類は疎水性が強
い分子であるため、湿式洗煙塔に流入した排ガス中のダ
イオキシン類は、洗煙水を介してゴム又は樹脂ライニン
グやプラスチック充填材に吸脱着される。このため、無
処理の洗煙塔においては、出口排ガスのダイオキシン類
濃度が入口ガスのそれを上回ることがある。この現象は
「メモリー効果」と称される。洗煙塔手前で粉末活性炭
を注入したり、洗煙塔内の洗煙水に粉末活性炭を懸濁さ
せるダイオキシン類処理の主目的の一つはこのメモリー
の除去であるが、メモリーの除去具合は洗煙塔の特性、
汚染の程度によって個々に異なり、一定していない。こ
のため、従来においては、ダイオキシン類の除去を確実
にするために、洗煙水中に活性炭を高濃度で長期間維持
する必要があった。As described above, since dioxins are molecules having a strong hydrophobicity, dioxins in exhaust gas flowing into a wet smoke tower absorb and desorb to rubber or a resin lining or a plastic filler through smoke water. Is done. For this reason, in an untreated smoke washing tower, the concentration of dioxins in the exhaust gas at the outlet may exceed that of the inlet gas. This phenomenon is called "memory effect". One of the main purposes of dioxin treatment to inject powdered activated carbon in front of the smoke washing tower or suspend powdered activated carbon in the smoke washing water in the smoke washing tower is to remove this memory. The characteristics of the smoke tower,
It varies depending on the degree of contamination and is not constant. For this reason, conventionally, in order to ensure the removal of dioxins, it was necessary to maintain a high concentration of activated carbon in smoke water for a long period of time.
【００１２】このメモリーの除去具合は、ダイオキシン
類が吸脱着する湿式洗煙塔内のゴム又は樹脂ライニング
やプラスチック充填材に残留、蓄積したダイオキシン類
量を測定することにより、直接的に求めることができる
が、湿式洗煙塔内の部品などを取り外してこれらを分析
することは、採取箇所によるバラツキが大きく、多大な
手間と時間を要することとなる。The degree of removal of the memory can be determined directly by measuring the amount of dioxins remaining and accumulated in the rubber or resin lining or plastic filler in the wet-type smoke washing tower where the dioxins adsorb and desorb. However, removing parts and the like inside the wet-type smoke washing tower and analyzing them removes a great deal of variation depending on the sampling location and requires a great deal of labor and time.
【００１３】このため、本発明においてはガス中又は水
中のダイオキシン類又はダイオキシン類前駆体の濃度
（なお、以下において、ダイオキシン類とダイオキシン
類前駆体とを合わせて「ダイオキシン類／前駆体」と記
す。）を測定し、その測定値に基づいて添加する活性炭
量を設定する。For this reason, in the present invention, the concentration of dioxins or dioxin precursors in gas or water (hereinafter, dioxins and dioxin precursors are collectively referred to as “dioxins / precursors”). )), And the amount of activated carbon to be added is set based on the measured value.
【００１４】請求項１の方法であれば、湿式洗煙塔入口
ガスと出口ガス中のダイオキシン類／前駆体濃度を測定
し、入口ガス中のダイオキシン類／前駆体濃度が出口ガ
ス中のダイオキシン類／前駆体濃度よりも少なければ、
メモリー除去は不十分であり、逆に、入口ガス中のダイ
オキシン類／前駆体濃度が出口ガス中のダイオキシン類
／前駆体濃度よりも多ければメモリー除去が進行してい
ると判断する。従って、これらのガス中ダイオキシン類
／前駆体濃度を経時的に測定、解析し、メモリーの除去
具合に応じて活性炭保持濃度を増減することによって、
効果的かつ効率的な処理を行える。According to the method of the present invention, the dioxin / precursor concentration in the inlet gas and the outlet gas of the wet-type smoke washing tower is measured, and the dioxin / precursor concentration in the inlet gas is determined in the outlet gas. / Less than precursor concentration,
Memory removal is insufficient. Conversely, if the concentration of dioxins / precursor in the inlet gas is higher than the concentration of dioxins / precursor in the outlet gas, it is determined that memory removal is in progress. Therefore, by measuring and analyzing the dioxin / precursor concentration in these gases with time, and increasing or decreasing the activated carbon retention concentration according to the degree of memory removal,
Effective and efficient processing can be performed.
【００１５】この方法において、更に洗煙排水又は循環
水中のダイオキシン類／前駆体濃度を測定することによ
り、メモリーの除去具合をより正確に把握することがで
きる。即ち、入口ガスダイオキシン類／前駆体濃度に排
ガス量を乗じて単位時間当たりのダイオキシン類／前駆
体負荷量を算出し、洗煙塔へのダイオキシン負荷量とす
る。一方、出口ガスダイオキシン類／前駆体濃度に排ガ
ス量を乗じたものと洗煙排水ダイオキシン類／前駆体濃
度に排水量を乗じたものを合算し、単位時間当たりのダ
イオキシン総排出量とする。メモリーが高い場合はダイ
オキシン負荷量＜ダイオキシン総排出量となり、メモリ
ーが除去されるにつれてその差は小さくなり、完全に除
去された場合は、理論的に負荷量＝総排出量となる。従
って、これら３項目のダイオキシン類／前駆体濃度を経
時的に測定、解析し、メモリーの除去具合に応じて活性
炭保持濃度を減らしていくことによって、効果的かつ効
率的なダイオキシン処理を行える。従って、請求項３の
方法は、湿式洗煙塔に活性炭を添加してダイオキシン類
を除去する方法において、湿式洗煙塔の入口ガス及び出
口ガスと洗煙排水中又は循環水中のダイオキシン類濃度
又はダイオキシン類前駆体濃度を測定し、それらの測定
値に基づいて添加する活性炭量を設定する湿式洗煙塔の
ダイオキシン類処理方法であって、入口ガスのダイオキ
シン類濃度又はダイオキシン類前駆体濃度に排ガス量を
乗じて単位時間当たりのダイオキシン類濃度又はダイオ
キシン類前駆体負荷量を算出し、洗煙塔へのダイオキシ
ン負荷量とし、一方で、出口ガスのダイオキシン類濃度
又はダイオキシン類前駆体濃度に排ガス量を乗じたもの
と洗煙排水又は循環水のダイオキシン類濃度又はダイオ
キシン類前駆体濃度に排水量を乗じたものを合算し、単
位時間当たりのダイオキシン総排出量とし、処理開始時
において、該湿式洗煙塔の活性炭保持濃度を設定し、処
理開始後、前記ダイオキシン負荷量＜前記ダイオキシン
総排出量となっている期間は、該処理開始時の活性炭保
持濃度を維持し、その後、前記ダイオキシン負荷量と前
記ダイオキシン総排出量との差がダイオキシン負荷量の
３０％以下となった時点で活性炭保持濃度を処理開始時
よりも２０〜４０％低減し、更に、処理を継続すること
により、ダイオキシン負荷量≒ダイオキシン総排出量と
なった時点で、活性炭保持濃度を処 理開始時よりも４０
〜６０％少ない量とすることを特徴とする。 In this method, by further measuring the concentration of dioxins / precursors in the smoke washing wastewater or circulating water, the degree of memory removal can be more accurately grasped. That is, the dioxin / precursor load per unit time is calculated by multiplying the inlet gas dioxin / precursor concentration by the amount of exhaust gas, and the calculated dioxin / precursor load is used as the dioxin load on the smoke washing tower. On the other hand, the sum of the product of the exhaust gas dioxin / precursor concentration multiplied by the amount of exhaust gas and the product of the smoke washing dioxin / precursor concentration multiplied by the amount of wastewater is defined as the total dioxin emission per unit time. When the memory is high, the dioxin load <the total dioxin emission, and the difference decreases as the memory is removed. When the memory is completely removed, the load theoretically becomes the total emission. Therefore, effective and efficient dioxin treatment can be performed by measuring and analyzing the dioxin / precursor concentrations of these three items with time and reducing the activated carbon retention concentration according to the degree of memory removal. Therefore, claim 3
The method is to add dioxin to activated carbon by adding activated carbon to a wet smoke tower.
In the method for removing gas, the inlet gas and outlet
Dioxin concentration in mouth gas and smoke wash drainage or circulating water
Or measure dioxin precursor concentration and measure them
Set the amount of activated carbon to be added based on the value
A method for treating dioxins, comprising:
Exhaust gas amount based on syn concentration or dioxin precursor concentration
Multiply dioxin concentration per unit time or dio
Calculate the precursor load of the toxins and dioxin
Dioxin concentration in the outlet gas
Or multiplied by exhaust gas amount to dioxin precursor concentration
Dioxin concentration or dioxin in smoke and wastewater or circulating water
The sum of the concentrations of the precursors of the toxins multiplied by the amount of wastewater is added up,
Total emission of dioxin per unit time, at the start of treatment
, The activated carbon retention concentration of the wet smoke tower is set,
After starting the treatment, the dioxin load <the dioxin
During the period when the total amount of emissions is equal to the
The dioxin load, and
The difference from the total dioxin emission is
Activated carbon retention concentration at the start of treatment when it becomes 30% or less
20 to 40% less than that of
And dioxin load divided by total dioxin emissions
At the time that it was, than at the time of processing the start of the activated carbon retention concentration 40
It is characterized in that the amount is reduced by up to 60%.
【００１６】また、請求項２の方法であれば、洗煙排水
又は循環水中のダイオキシン類／前駆体濃度を測定、解
析するというより簡便な方法で、メモリー除去をおおま
かに推定することができる。即ち、活性炭処理の初期は
洗煙塔内に蓄積したダイオキシン類／前駆体が活性炭に
吸着されて排出されるため、メモリーが十分に除去でき
ていない状態では処理前に比べてダイオキシン類／前駆
体濃度が高くなる。メモリー除去が進むにつれて洗煙塔
から持ち出されるダイオキシン類／前駆体は減少し、一
定の値に落ち着く。従って、洗煙排水又は循環水のダイ
オキシン類／前駆体濃度を経時的に測定、解析し、メモ
リーの除去具合に応じて活性炭保持濃度を減らしていく
ことによって、効果的かつ効率的な処理を行うことがで
きる。Further, according to the method of claim 2, the removal of memory can be roughly estimated by a simpler method of measuring and analyzing the concentration of dioxins / precursors in the smoke washing wastewater or circulating water. That is, in the early stage of the activated carbon treatment, the dioxins / precursors accumulated in the smoke washing tower are adsorbed by the activated carbon and discharged therefrom. Therefore, when the memory is not sufficiently removed, the dioxins / precursors are compared with those before the treatment. The concentration increases. As memory removal proceeds, dioxins / precursors taken out of the smoke tower decrease and settle to a constant value. Therefore, effective and efficient treatment is performed by measuring and analyzing the concentration of dioxins / precursors in the smoke washing wastewater or circulating water over time and reducing the activated carbon retention concentration according to the degree of memory removal. be able to.
【００１７】[0017]
【発明の実施の形態】以下に本発明の湿式洗煙塔のダイ
オキシン類処理方法の実施の形態を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the method for treating dioxins in a wet smoke tower according to the present invention will be described in detail below.
【００１８】請求項１の方法においては、湿式洗煙塔入
口ガス及び出口ガス中のダイオキシン類／前駆体濃度を
測定し、それらの測定値に基づいて、例えば、以下のよ
うに洗煙塔の活性炭保持濃度を設定し、この活性炭保持
濃度となるように、洗煙塔に添加する活性炭量を制御す
る。In the method of claim 1, the concentrations of dioxins / precursors in the inlet gas and the outlet gas of the wet-type smoke cleaning tower are measured, and based on the measured values, for example, The activated carbon retention concentration is set, and the amount of activated carbon added to the smoke washing tower is controlled so as to achieve the activated carbon retention concentration.
【００１９】まず、処理開始時においては、活性炭保持
濃度を０．５〜２ｇ／Ｌに設定する。処理開始後、メモ
リー効果で入口ガスのダイオキシン類／前駆体濃度＜出
口ガスのダイオキシン類／前駆体濃度となっている期間
は、上記０．５〜２ｇ／Ｌの活性炭保持濃度を維持す
る。その後、入口ガスのダイオキシン類／前駆体濃度≒
出口ガスのダイオキシン類／前駆体濃度となった時点で
活性炭保持濃度を処理開始時よりも１０〜２０％低減
し、０．４〜１．８ｇ／Ｌとする。更に、処理を維持す
ることによりメモリー除去が進み、入口ガスダイオキシ
ン類／前駆体濃度よりも出口ガスダイオキシン類／前駆
体濃度が２０〜４０％程度低くなった時点で活性炭保持
濃度をさらに低減し、処理開始時よりも２０〜４０％少
ない０．３〜１．６ｇ／Ｌとする。First, at the start of the treatment, the activated carbon holding concentration is set to 0.5 to 2 g / L. After the start of the treatment, during the period in which the concentration of dioxins / precursor in the inlet gas <the concentration of dioxins / precursor in the outlet gas due to the memory effect, the above-mentioned activated carbon retention concentration of 0.5 to 2 g / L is maintained. After that, dioxin / precursor concentration of inlet gas ガ ス
When the concentration of dioxins / precursor in the outlet gas reaches the concentration, the activated carbon retention concentration is reduced by 10 to 20% from that at the start of the treatment to 0.4 to 1.8 g / L. Further, the memory removal proceeds by maintaining the treatment, and when the outlet gas dioxins / precursor concentration becomes lower by about 20 to 40% than the inlet gas dioxins / precursor concentration, the activated carbon retention concentration is further reduced, The amount is 0.3 to 1.6 g / L, which is 20 to 40% smaller than that at the start of processing.
【００２０】この方法においては、前述の如く、更に、
洗煙排水又は循環水中のダイオキシン類濃度を測定し、
入口ガスダイオキシン類／前駆体濃度に排ガス量を乗じ
て単位時間当たりのダイオキシン類／前駆体負荷量を算
出し、洗煙塔へのダイオキシン負荷量とし、一方で、出
口ガスダイオキシン類／前駆体濃度に排ガス量を乗じた
ものと洗煙排水又は循環水のダイオキシン類／前駆体濃
度に排水量を乗じたものを合算し、単位時間当たりのダ
イオキシン総排出量とし、これらの値に基づいて、例え
ば、以下のようにして活性炭保持濃度を設定することに
より、より一層メモリー除去具合を正確に把握して的確
な活性炭添加量の制御を行える。In this method, as described above,
Measure the concentration of dioxins in the smoke washing wastewater or circulating water,
The dioxin / precursor concentration per unit time is calculated by multiplying the inlet gas dioxin / precursor concentration by the amount of exhaust gas, and is used as the dioxin load on the smoke washing tower, while the outlet gas dioxin / precursor concentration The sum of the product obtained by multiplying the exhaust gas amount and the product obtained by multiplying the dioxin / precursor concentration of the smoke washing wastewater or circulating water by the wastewater amount is used as the total dioxin emission per unit time, and based on these values, for example, By setting the activated carbon retention concentration as described below, the degree of memory removal can be more accurately grasped, and the amount of activated carbon added can be controlled accurately.
【００２１】まず、処理開始時においては、活性炭保持
濃度を０．５〜２ｇ／Ｌに設定する。処理開始後、メモ
リー効果でダイオキシン負荷量＜ダイオキシン総排出量
となっている期間は、上記０．５〜２ｇ／Ｌの活性炭保
持濃度を維持する。その後、メモリー除去が進みダイオ
キシン総排出量が徐々に低減し、ダイオキシン負荷量と
ダイオキシン総排出量との差がダイオキシン負荷量の３
０％以下となった時点で活性炭保持濃度を処理開始時よ
りも２０〜４０％低減し、０．３〜１．６ｇ／Ｌとす
る。更に、処理を継続することにより、メモリー除去が
進み、ダイオキシン負荷量≒ダイオキシン総排出量とな
った時点では、メモリーが完全に除去されたと判定し、
活性炭保持濃度を更に低減し、処理開始時よりも４０〜
６０％少ない０．２〜１．２ｇ／Ｌとする。First, at the start of the treatment, the activated carbon holding concentration is set to 0.5 to 2 g / L. After the start of the treatment, the above-mentioned activated carbon retention concentration of 0.5 to 2 g / L is maintained during a period in which the dioxin load is smaller than the total dioxin discharge due to the memory effect. After that, memory removal progresses and total dioxin emission gradually decreases, and the difference between dioxin load and total dioxin emission is 3% of dioxin load.
When the concentration becomes 0% or less, the activated carbon retention concentration is reduced by 20 to 40% from that at the start of the treatment to 0.3 to 1.6 g / L. Further, by continuing the processing, the memory removal progresses, and when the dioxin load amount ≒ the total dioxin discharge amount, it is determined that the memory has been completely removed,
Activated carbon retention concentration is further reduced to 40-
It is set to 0.2 to 1.2 g / L which is 60% smaller.
【００２２】請求項２の方法においては、洗煙排水中又
は循環水中のダイオキシン類／前駆体濃度を測定し、そ
の測定値に基づいて、例えば、以下のように洗煙塔の活
性炭保持濃度を設定し、この活性炭保持濃度となるよう
に、洗煙塔に添加する活性炭量を制御する。In the method according to the second aspect, the concentration of dioxins / precursors in the smoke-washing wastewater or circulating water is measured, and based on the measured value, for example, the activated carbon retention concentration in the smokewashing tower is determined as follows. It is set and the amount of activated carbon added to the smoke washing tower is controlled so as to achieve this activated carbon retention concentration.
【００２３】まず、処理開始時においては、活性炭保持
濃度を０．５〜２ｇ／Ｌに設定する。処理開始初期にお
いては、洗煙塔内に蓄積したダイオキシン類／前駆体が
活性炭に吸着されて排出されるため、メモリーが十分に
除去できていない状態では処理前に比べて洗煙排水又は
循環水中のダイオキシン類／前駆体濃度が高くなる。メ
モリー除去が進むにつれて洗煙塔から持ち出されるダイ
オキシン類／前駆体は減少を始めるので、洗煙排水中或
いは循環水中のダイオキシン類／前駆体濃度が減少を始
めた時点で、活性炭保持濃度を処理開始時よりも２０〜
４０％低減し、０．３〜１．６ｇ／Ｌとする。First, at the start of the treatment, the activated carbon holding concentration is set to 0.5 to 2 g / L. In the early stage of treatment, dioxins / precursors accumulated in the smoke tower are adsorbed on activated carbon and discharged, so if the memory is not sufficiently removed, compared to before treatment, the wastewater or circulating water Dioxins / precursor concentration increases. As the removal of memory progresses, the amount of dioxins / precursors taken out of the smoke washing tower begins to decrease, so when the concentration of dioxins / precursors in the smoke washing wastewater or circulating water starts to decrease, the activated carbon retention concentration is started. 20 ~
Reduce by 40% to 0.3 to 1.6 g / L.
【００２４】このような本発明の方法において、測定す
るダイオキシン類／前駆体とは、前述のダイオキシン類
や、クロロベンゼン、クロロフェノール等の有機塩素化
合物等のダイオキシン類前駆体であり、ダイオキシン類
又はダイオキシン類前駆体のいずれを測定対象としても
よいが、分析時間が短い等の点から、ダイオキシン類前
駆体を測定する方が実用性が高い場合もある。In the method of the present invention, the dioxins / precursors to be measured are the above-mentioned dioxins and dioxin precursors such as organic chlorine compounds such as chlorobenzene and chlorophenol. Although any of the precursors may be measured, it may be more practical to measure the dioxin precursor in view of the short analysis time and the like.
【００２５】上記の制御方法は、本発明の実施の形態の
一例であって、本発明は何ら上記制御方法に限定される
ものではない。例えば、活性炭保持濃度は、段階的に低
減する他、各測定値に連動させて連続的に低減してもよ
い。また、段階的に低減する場合、より多くの制御ポイ
ントを設けてもよい。また、本発明の方法では、活性炭
保持濃度を処理開始時よりも経時により低減する場合に
限らず、運転条件等によっては、増加させる場合もあ
る。The above control method is an example of the embodiment of the present invention, and the present invention is not limited to the above control method. For example, the activated carbon retention concentration may be reduced stepwise, or may be continuously reduced in association with each measured value. In the case of stepwise reduction, more control points may be provided. Further, in the method of the present invention, the activated carbon holding concentration is not limited to be reduced with time than at the start of the treatment, and may be increased depending on operating conditions and the like.
【００２６】なお、本発明において、湿式洗煙塔の活性
炭保持濃度とは、湿式洗煙塔の洗煙水（ないし洗煙循環
水）中の活性炭保持濃度であり、この活性炭保持濃度を
維持するための粉末活性炭は、スラリーとして洗煙循環
水ラインもしくは洗煙循環水貯水槽に加えても良く、ま
た、湿式洗煙塔前の煙道排ガスに乾式注入しても良い。
より効果的なダイオキシン類／前駆体除去のためには、
スラリー注入と乾式注入を併用するのが望ましい。In the present invention, the activated carbon retention concentration in the wet smoke tower refers to the activated carbon retention concentration in the smoke water (or smoke circulating water) of the wet smoke tower, and this activated carbon retention concentration is maintained. The activated carbon powder may be added as a slurry to a smoke washing circulating water line or a smoke washing circulating water storage tank, or may be dry-injected into flue exhaust gas before a wet smoke washing tower.
For more effective dioxin / precursor removal,
It is desirable to use both slurry injection and dry injection.
【００２７】いずれの注入方法を採用する場合において
も、活性炭保持濃度は５０〜２０００ｍｇ／Ｌ、特に５
００〜１０００ｍｇ／Ｌの範囲で前記測定値に基づいて
調整するのが好ましい。In any of the injection methods, the activated carbon retention concentration is 50 to 2000 mg / L, especially 5 to 2000 mg / L.
It is preferable to adjust in the range of 00 to 1000 mg / L based on the measured value.
【００２８】このような本発明の方法は、都市ごみ、産
業廃棄物、医療廃棄物等の焼却施設に限らず、排ガス処
理工程に湿式洗煙塔を採用しているダイオキシン類排出
プロセスであれば、その他の焼結炉、電炉、亜鉛回収プ
ロセス、アルミ精錬プロセス等に良好に適用可能であ
る。The method of the present invention is not limited to incineration facilities for municipal solid waste, industrial waste, medical waste, and the like, but may be applied to any dioxin emission process employing a wet smoke tower in the exhaust gas treatment process. And other sintering furnaces, electric furnaces, zinc recovery processes, aluminum refining processes, etc.
【００２９】[0029]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。The present invention will be described more specifically below with reference to examples and comparative examples.
【００３０】なお、以下においては、ダイオキシン類／
前駆体濃度として、ダイオキシン類濃度を測定している
が、ダイオキシン類前駆体濃度を測定しても同様の効果
を得ることができる。In the following, dioxins /
Although the dioxin concentration is measured as the precursor concentration, the same effect can be obtained by measuring the dioxin precursor concentration.
【００３１】実施例１ 湿式洗煙塔を有するＡ産業廃棄物焼却炉において、洗煙
塔の活性炭処理を実施した。処理開始時の活性炭保持濃
度は１ｇ／Ｌとし、洗煙塔入口ガス及び出口ガスのダイ
オキシン類濃度を測定した。Example 1 Activated carbon treatment of a smoke-washing tower was carried out in an A industrial waste incinerator having a wet-type smoke washing tower. The activated carbon retention concentration at the start of the treatment was 1 g / L, and the concentrations of dioxins in the gas at the inlet and the outlet of the smoke washing tower were measured.
【００３２】表１に示すように、処理開始時のダイオキ
シン類濃度は入口ガス１．５ｎｇ−ＴＥＱ／Ｎｍ３、出
口ガス２．５ｎｇ−ＴＥＱ／Ｎｍ３とメモリーによる逆
転現象が認められた。１週間後、この値がほぼ同等にな
ったので、活性炭保持濃度を０．８ｇ／Ｌに減少させ
た。更に、１ヵ月後、出口ガスのダイオキシン類濃度は
０．９７ｎｇ−ＴＥＱ／Ｎｍ３に下がり、メモリー除去
が進んだと判断されたので、活性炭保持濃度を０．６ｇ
／Ｌとさらに削減した。２ヵ月後のダイオキシン類濃度
は入口ガス１．７ｎｇ−ＴＥＱ／Ｎｍ３、出口ガス０．
９２ｎｇ−ＴＥＱ／Ｎｍ３と良好な値であった。As shown in Table 1, the concentration of dioxins at the start of processing the inlet gas 1.5ng-TEQ / Nm 3, the outlet gas 2.5ng-TEQ / Nm 3 and reversal phenomenon due to memory was observed. One week later, the values were almost the same, so the activated carbon retention concentration was reduced to 0.8 g / L. One month later, the concentration of dioxins in the outlet gas was reduced to 0.97 ng-TEQ / Nm 3 , and it was determined that the memory removal was advanced.
/ L and further reduced. After two months, the concentration of dioxins was 1.7 ng-TEQ / Nm 3 at the inlet gas and 0,0 at the outlet gas.
Was good value, 92ng-TEQ / Nm 3.
【００３３】この結果、洗煙塔入口ガスと出口ガスのダ
イオキシン類濃度に基づいて活性炭保持濃度を制御する
ことにより、活性炭保持濃度を１ｇ／Ｌから０．６ｇ／
Ｌにまで４０％も低減することができた。As a result, by controlling the activated carbon holding concentration based on the dioxin concentrations of the gas at the inlet and the outlet of the smoke washing tower, the activated carbon holding concentration is increased from 1 g / L to 0.6 g / L.
L could be reduced by 40%.
【００３４】[0034]
【表１】 [Table 1]
【００３５】実施例２ 湿式洗煙塔を有するＢごみ焼却炉において、洗煙塔の活
性炭処理を実施した。処理開始時の活性炭保持濃度は１
ｇ／Ｌとし、洗煙塔入口ガス及び出口ガス、洗煙排水の
ダイオキシン類濃度を測定し、排ガス流量及び排水量か
ら洗煙塔へのダイオキシン負荷量と総排出量を算出し
た。Example 2 In a B refuse incinerator having a wet smoke tower, the activated smoke treatment of the smoke tower was performed. Activated carbon retention concentration at the start of treatment is 1
g / L, the concentration of dioxins in the gas at the inlet and outlet of the smoke washing tower, and the concentration of dioxins in the smoke washing wastewater were calculated from the exhaust gas flow rate and the amount of wastewater, and the amount of dioxin loaded into the smoke washing tower and the total discharge amount.
【００３６】表２に示すように、処理開始時の洗煙塔へ
のダイオキシン負荷量は３９μｇ−ＴＥＱ／ｈｒ、総排
出量は１０１μｇ−ＴＥＱ／Ｎｍ３と負荷に比べて総排
出量が著しく多かった。半月後、総排出量は減少した
が、まだ負荷量よりも多かった。出口ガスのダイオキシ
ン類濃度は１．２ｎｇ−ＴＥＱ／Ｎｍ３から０．４２ｎ
ｇ−ＴＥＱ／Ｎｍ３となったが、依然としてメモリーが
残っているものと判断された。２ヵ月後、負荷量と総排
出量の差が３０％以内になったので活性炭保持濃度を
０．７５ｇ／Ｌに減少させた。３ヵ月後、総排出量は負
荷量とほぼ同じとなり、出口ガスダイオキシン類濃度も
０．１５ｎｇ−ＴＥＱ／Ｎｍ３と良好な値であった。As shown in Table 2, the dioxin load on the smoke washing tower at the start of the treatment was 39 μg-TEQ / hr, and the total discharge was 101 μg-TEQ / Nm 3, which was significantly higher than the load. Was. Half a month later, total emissions decreased but were still higher than load. The dioxin concentration of the outlet gas is from 1.2 ng-TEQ / Nm 3 to 0.42 n
It became a g-TEQ / Nm 3, but it was judged that still remains is memory. Two months later, the difference between the load and the total discharge was within 30%, so the activated carbon retention concentration was reduced to 0.75 g / L. After 3 months, the total discharge amount was good value, loading and substantially the same becomes, 0.15 ng-TEQ / Nm 3 also the outlet gas dioxin concentration.
【００３７】この結果、洗煙塔入口ガスと出口ガスのダ
イオキシン類濃度と洗煙排水中のダイオキシン類濃度に
基づいて活性炭保持濃度を制御することにより、活性炭
保持濃度を１ｇ／Ｌから０．７５ｇ／Ｌにまで２５％低
減することができた。As a result, the activated carbon retention concentration is controlled from 1 g / L to 0.75 g by controlling the activated carbon retention concentration based on the dioxin concentrations in the gas at the inlet and the outlet of the smoke washing tower and the dioxins in the smoke washing wastewater. / L could be reduced by 25%.
【００３８】[0038]
【表２】 [Table 2]
【００３９】実施例３ 湿式洗煙塔を有するＣ都市ごみ焼却炉において、洗煙塔
の活性炭処理を実施した。処理開始時の活性炭保持濃度
は１ｇ／Ｌとし、洗煙塔出口ガスのダイオキシン類濃度
と洗煙排水のダイオキシン類濃度を測定した。Example 3 In a C municipal solid waste incinerator having a wet smoke tower, activated carbon treatment of the smoke tower was performed. The activated carbon retention concentration at the start of the treatment was 1 g / L, and the concentration of dioxins in the gas at the outlet of the smoke washing tower and the concentration of dioxins in the wastewater of the smoke washing were measured.
【００４０】表３に示すように、処理開始時の洗煙塔出
口ガスのダイオキシン類濃度は３．１ｎｇ−ＴＥＱ／Ｎ
ｍ３であり、洗煙排水中のダイオキシン類濃度は５ｎｇ
−ＴＥＱ／Ｌであった。１週間後、洗煙排水中のダイオ
キシン類濃度は１５ｎｇ−ＴＥＱ／Ｌに増加した。これ
は、洗煙塔に蓄積されたダイオキシン類が活性炭により
排出されていることを示している。１ヵ月後、洗煙排水
中のダイオキシン類濃度が１０ｎｇ−ＴＥＱ／Ｌと減少
に転じたので、活性炭保持濃度を０．８ｇ／Ｌに減少さ
せた。２ヵ月後に洗煙塔出口ガスのダイオキシン類濃度
は０．９ｎｇ−ＴＥＱ／Ｎｍ３と良好な値であった。As shown in Table 3, the concentration of dioxins in the gas at the outlet of the smoke washing tower at the start of the treatment was 3.1 ng-TEQ / N.
m 3, the concentration of dioxins in the Araikemuri wastewater 5ng
-TEQ / L. One week later, the concentration of dioxins in the smoke-washing wastewater increased to 15 ng-TEQ / L. This indicates that dioxins accumulated in the smoke tower are discharged by the activated carbon. One month later, the concentration of dioxins in the smoke wash effluent started to decrease to 10 ng-TEQ / L, so the activated carbon retention concentration was reduced to 0.8 g / L. Concentration of dioxins Araikemuri tower outlet gas after 2 months was good value as 0.9ng-TEQ / Nm 3.
【００４１】この結果、洗煙排水中のダイオキシン類濃
度に基づいて活性炭保持濃度を制御することにより、活
性炭保持濃度を１ｇ／Ｌから０．８ｇ／Ｌにまで２０％
も低減することができた。As a result, by controlling the activated carbon holding concentration based on the concentration of dioxins in the smoke washing wastewater, the activated carbon holding concentration was reduced from 1 g / L to 0.8 g / L by 20%.
Was also able to be reduced.
【００４２】[0042]
【表３】 [Table 3]
【００４３】[0043]
【発明の効果】以上詳述した通り、本発明の湿式洗煙塔
のダイオキシン類処理方法によれば、湿式洗煙塔に活性
炭を添加してダイオキシン類を除去するに当たり、湿式
洗煙塔の入口ガス及び出口ガス、或いは循環水又は洗煙
排水のダイオキシン類濃度又はダイオキシン前駆体濃度
を測定、解析することによって、洗煙塔内のメモリー除
去具合を簡便かつ的確に把握し、これをもとに洗煙水中
の粉末活性炭保持濃度を適正に制御することができ、効
果的かつ効率的にダイオキシン類を除去することができ
る。As described in detail above, according to the method for treating dioxins in a wet smoke tower according to the present invention, when dioxins are removed by adding activated carbon to the wet smoke tower, the inlet of the wet smoke tower is removed. Measure and analyze the dioxin concentration or dioxin precursor concentration of gas and outlet gas, or circulating water or smoke wash effluent to easily and accurately grasp the degree of memory removal in the smoke wash tower, and based on this, It is possible to properly control the concentration of powdered activated carbon retained in the smoke washing water, and to effectively and efficiently remove dioxins.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平11−70320（ＪＰ，Ａ) 国際公開97／49478（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 53/34 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-11-70320 (JP, A) WO 97/49478 (WO, A1) (58) Fields investigated (Int. Cl. 7 , DB name) B01D 53/34
Claims (3)
シン類を除去する方法において、 湿式洗煙塔の入口ガス及び出口ガスのダイオキシン類濃
度又はダイオキシン類前駆体濃度を測定し、 それらの測定値に基づいて添加する活性炭量を設定する
湿式洗煙塔のダイオキシン類処理方法であって、 処理開始時において、該湿式洗煙塔の活性炭保持濃度を
設定し、 処理開始後、入口ガスのダイオキシン類濃度又はダイオ
キシン類前駆体濃度＜出口ガスのダイオキシン類濃度又
はダイオキシン類前駆体濃度となっている期間は、該処
理開始時の活性炭保持濃度を維持し、 その後、入口ガスのダイオキシン類濃度又はダイオキシ
ン類前駆体濃度≒出口ガスのダイオキシン類濃度又はダ
イオキシン類前駆体濃度となった時点で活性炭保持濃度
を処理開始時よりも１０〜２０％低減し、 更に、入口ガスのダイオキシン類濃度又はダイオキシン
類前駆体濃度よりも出口ガスのダイオキシン類濃度又は
ダイオキシン類前駆体濃度が２０〜４０％程度低くなっ
た時点で活性炭保持濃度を処理開始時よりも２０〜４０
％少ない量とする ことを特徴とする湿式洗煙塔のダイオ
キシン類処理方法。An activated carbon is added to a wet smoke tower to add dioxin.
In the method for removing synths, the dioxin concentration in the inlet gas and the outlet gas of the wet smoke tower is
Measure the concentration or dioxin precursor concentration and set the amount of activated carbon to be added based on those measured values
A method for treating dioxins in a wet smoke tower, At the start of treatment, the concentration of activated carbon retained in the wet
Set, After the start of treatment, the concentration of dioxins in the inlet gas or
Xin precursor concentration <dioxin concentration in outlet gas or
During the period when the dioxin precursor concentration is at
Maintain the activated carbon retention concentration at the start of treatment, After that, the dioxin concentration of the inlet gas or dioxin
Precursor concentration ≒ dioxin concentration in outlet gas or
Activated carbon retention concentration at the time of ioxine precursor concentration
Is reduced by 10 to 20% from that at the start of processing, Furthermore, the dioxin concentration of the inlet gas or dioxin
Dioxin concentration in the outlet gas rather than the precursor concentration
Dioxin precursor concentration decreased by about 20-40%
The activated carbon retention concentration at the time of
% Less Wet smoke tower dio characterized by the following:
Xins treatment method.
シン類を除去する方法において、 湿式洗煙塔の洗煙排水中又は循環水中のダイオキシン類
濃度又はダイオキシン類前駆体濃度を測定し、 その測定値に基づいて添加する活性炭量を設定する湿式
洗煙塔のダイオキシン類処理方法であって、 処理開始時において、該湿式洗煙塔の活性炭保持濃度を
設定し、 処理開始後、処理前に比べて洗煙排水中又は循環水中の
ダイオキシン類濃度又はダイオキシン類前駆体濃度が高
くなった後、洗煙排水中又は循環水中のダイオキシン類
濃度又はダイオキシン類前駆体濃度が減少を始めた時点
で、活性炭保持 濃度を処理開始時よりも２０〜４０％低
減する ことを特徴とする湿式洗煙塔のダイオキシン類処
理方法。2. Activated carbon is added to a wet smoke tower to add
In the method for removing synths, dioxins in the smoke-washing wastewater of a wet-type smoke tower or in circulating water
Measure the concentration or dioxin precursor concentration and set the amount of activated carbon to be added based on the measured valueWet
A method for treating dioxins in a smoke tower, At the start of treatment, the concentration of activated carbon retained in the wet
Set, After the start of treatment, compared to before treatment,
High dioxin concentration or dioxin precursor concentration
Dioxins in smoke and wastewater or circulating water after exhaustion
When the concentration or dioxin precursor concentration begins to decrease
With activated carbon retention 20-40% lower density than at the start of processing
Reduce Dioxin treatment for wet smoke tower
Method.
シン類を除去する方法において、 湿式洗煙塔の入口ガス及び出口ガスと洗煙排水中又は循
環水中のダイオキシン類濃度又はダイオキシン類前駆体
濃度を測定し、 それらの測定値に基づいて添加する活性炭量を設定する
湿式洗煙塔のダイオキシン類処理方法であって、 入口ガスのダイオキシン類濃度又はダイオキシン類前駆
体濃度に排ガス量を乗じて単位時間当たりのダイオキシ
ン類濃度又はダイオキシン類前駆体負荷量を算出し、洗
煙塔へのダイオキシン負荷量とし、 一方で、出口ガスのダイオキシン類濃度又はダイオキシ
ン類前駆体濃度に排ガス量を乗じたものと洗煙排水又は
循環水のダイオキシン類濃度又はダイオキシン類前駆体
濃度に排水量を乗じたものを合算し、単位時間当たりの
ダイオキシン総排出量とし、 処理開始時において、該湿式洗煙塔の活性炭保持濃度を
設定し、 処理開始後、前記ダイオキシン負荷量＜前記ダイオキシ
ン総排出量となっている期間は、該処理開始時の活性炭
保持濃度を維持し、 その後、前記ダイオキシン負荷量と前記ダイオキシン総
排出量との差がダイオキシン負荷量の３０％以下となっ
た時点で活性炭保持濃度を処理開始時よりも２０〜４０
％低減し、 更に、処理を継続することにより、ダイオキシン負荷量
≒ダイオキシン総排出量となった時点で、活性炭保持濃
度を処理開始時よりも４０〜６０％少ない量とする こと
を特徴とする湿式洗煙塔のダイオキシン類処理方法。3. A method of adding a activated carbon to a wet-type smoke tower and adding
In the method for removing synths, the gas at the inlet and outlet of the wet-type smoke washing tower and the smoke
Dioxin concentration in ring water or dioxin precursor
Measure the concentration and set the amount of activated carbon to be added based on the measured values
A method for treating dioxins in a wet smoke tower, Dioxin concentration or dioxin precursor in inlet gas
Dioxygen per unit time by multiplying body concentration by exhaust gas amount
Calculate the concentration of dioxins or dioxin precursor load and wash
Dioxin load on smoke tower, On the other hand, the dioxin concentration in the outlet gas or dioxin
Precursor concentration multiplied by the amount of exhaust gas and smoke washing wastewater or
Dioxin concentration in circulating water or dioxin precursor
The sum of the concentration multiplied by the amount of wastewater is added up, and the
Dioxin total emissions, At the start of treatment, the concentration of activated carbon retained in the wet
Set, After the treatment is started, the dioxin load <the dioxin
Activated carbon at the beginning of the treatment
Maintain the retention concentration, Thereafter, the dioxin load and the dioxin total
The difference from the emission amount is less than 30% of the dioxin load
The activated carbon retention concentration at the time of
% Reduction Furthermore, by continuing the treatment, the dioxin load
で When the total amount of dioxin emission reaches,
Make the degree 40 to 60% less than at the start of processing thing
A method for treating dioxins in a wet smoke tower.
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