JP2002361043A - Waste gas treatment method and treatment equipment - Google Patents
Waste gas treatment method and treatment equipmentInfo
- Publication number
- JP2002361043A JP2002361043A JP2001171922A JP2001171922A JP2002361043A JP 2002361043 A JP2002361043 A JP 2002361043A JP 2001171922 A JP2001171922 A JP 2001171922A JP 2001171922 A JP2001171922 A JP 2001171922A JP 2002361043 A JP2002361043 A JP 2002361043A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- water
- tower
- dioxin
- waste gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Drying Of Gases (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Filtration Of Liquid (AREA)
- Water Treatment By Sorption (AREA)
- Chimneys And Flues (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は焼却、加熱、溶融等
の各種操作から排出される有害成分を含む排ガスの処理
方法および処理装置に関し、より詳しくは、湿式洗浄塔
を用いた排ガス処理方法および処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating exhaust gas containing harmful components discharged from various operations such as incineration, heating and melting, and more particularly, to an exhaust gas treatment method using a wet washing tower, It relates to a processing device.
【０００２】[0002]
【従来の技術】図３（ａ，）（ｂ，）（ｃ）は従来の排
ガス処理方法の一例を示す説明図である。焼却炉等から
排出された８００℃以上の高温排ガスは、ボイラやエコ
ノマイザ等の熱エネルギー回収手段を経て、例えば２５
０℃〜３５０℃に冷却され、続いて水噴霧式の排ガス減
温塔２１に導入されて、ダイオキシンの発生の少ない２
００℃以下に冷却されたあと、バグフィルタ２２にて集
塵処理されていた（図３（ａ））。2. Description of the Related Art FIGS. 3A, 3B and 3C are explanatory views showing an example of a conventional exhaust gas treatment method. The high-temperature exhaust gas of 800 ° C. or higher discharged from an incinerator or the like passes through thermal energy recovery means such as a boiler or an economizer, and is discharged, for example, into 25%.
It is cooled to 0 ° C. to 350 ° C. and subsequently introduced into a water spray type exhaust gas temperature reduction tower 21 to reduce dioxin generation 2
After being cooled to a temperature of 00 ° C. or lower, the dust was collected by the bag filter 22 (FIG. 3A).
【０００３】あるいは、熱回収手段を経た排ガスは、２
５０℃〜３５０℃の高温で電気集塵器２３に導入されて
集塵処理され、続いて薬液噴霧部２４ａと減湿部２４ｂ
からなる湿式洗浄塔２４に導入され、苛性ソーダを排ガ
ス中に噴霧して排ガス中の酸性成分を除去し、減湿部２
４ｂで減湿水が噴霧されて排ガスが冷却される。そし
て、減湿部２４ｂで回収された減湿水は再使用のため一
時的に減湿水槽および減湿水冷却器２５に貯留され、減
湿部２４ｂに噴霧するようになっている（図３
（ｂ））。Alternatively, the exhaust gas that has passed through the heat recovery means is
It is introduced into the electrostatic precipitator 23 at a high temperature of 50 ° C. to 350 ° C. and is subjected to dust collection processing.
Is introduced into the wet washing tower 24, and the caustic soda is sprayed into the exhaust gas to remove acidic components in the exhaust gas.
In 4b, the dehumidified water is sprayed to cool the exhaust gas. The dehumidified water collected in the dehumidifying section 24b is temporarily stored in the dehumidifying water tank and the dehumidified water cooler 25 for reuse, and is sprayed on the dehumidifying section 24b (FIG. 3).
(B)).
【０００４】また、上記の類似方法として、排ガス減温
塔２１にて排ガスを冷却したあと、バグフィルタ２３や
電気集塵器２３等により集塵処理を行い、その後、湿式
洗浄塔２４にて処理する方法もしばしば採用されていた
（図３（ｃ））。このように、水噴霧式の排ガス減温塔
２１を用いる場合、スプレーノズルで噴霧する噴霧水
は、施設内の再利用水または外部から購入する上水を用
いていることが多かった。また、循環使用する減湿水は
循環使用量より、余剰となる場合が多く、別途処理して
放流するなどの措置がとられていた。[0004] As a similar method to the above, after exhaust gas is cooled in an exhaust gas cooling tower 21, dust collection processing is performed by a bag filter 23, an electric dust collector 23, and the like, and then processing is performed in a wet cleaning tower 24. This method has often been adopted (FIG. 3C). As described above, when the water spray type exhaust gas temperature reduction tower 21 is used, the spray water sprayed by the spray nozzle is often water reused in the facility or clean water purchased from the outside. Further, the dehumidified water to be circulated is often surplus than the circulated amount, and measures such as separate treatment and discharge are taken.
【０００５】[0005]
【発明が解決しようとする課題】上記のように、排ガス
減温塔２１で噴霧する噴霧水として、上水を用いる場合
は、噴霧量が多いため上水利用量が甚大となるという問
題があった。また、排ガス減温塔２１の噴霧水として施
設内の再利用水を用いる場合は、上水より安価ではある
が、施設内のダイオキシン含有物と接触があるため、ダ
イオキシン類を含有している場合が多く、公害防止上の
不具合を生じていた。As described above, when clean water is used as the spray water to be sprayed in the exhaust gas cooling tower 21, there is a problem that the spray amount is large and the clean water usage becomes enormous. Was. In addition, when the reused water in the facility is used as the spray water for the exhaust gas cooling tower 21, although it is cheaper than the clean water, it is in contact with the dioxin-containing substance in the facility, and therefore contains dioxins. Many, causing problems in pollution prevention.
【０００６】一方、排ガス中に含まれるダイオキシン類
は、減湿水に排ガス由来（微細ダストを含む）のダイオ
キシンが移行する恐れが多く、減湿水を循環使用する場
合は、ダイオキシンの含有量が相対的に高くなってしま
う危険性を生じていた。減湿水中のダイオキシン濃度が
高くなると、場合によっては逆に減湿水から排ガスにダ
イオキシンが移行する恐れもあり、大気環境へのダイオ
キシン排出量が増えてしまう不具合を生じることがあっ
た。On the other hand, the dioxins contained in the exhaust gas are liable to transfer dioxin derived from the exhaust gas (including fine dust) to the dehumidified water, and when the dehumidified water is circulated, the dioxin content is reduced. There was a risk of becoming relatively high. If the concentration of dioxin in the dehumidified water increases, there is a possibility that dioxin may be transferred from the dehumidified water to the exhaust gas in some cases, resulting in a problem that the amount of dioxin discharged into the atmospheric environment increases.
【０００７】本発明は循環使用する余剰気味の減温水を
効率よく再利用できるとともに、上記の課題を解決する
ことができる排ガス処理方法および処理装置を提供する
ことを目的とする。[0007] It is an object of the present invention to provide an exhaust gas treatment method and a treatment apparatus capable of efficiently reusing surplus de-heated water used in circulation and solving the above-mentioned problems.
【０００８】[0008]
【課題を解決するための手段】（１） 本発明に係る排
ガス処理方法は、有害成分を含む排ガスを水噴霧式の排
ガス減温塔に導入して冷却し、ついで集塵装置に導入し
て排ガス中のばいじんを除去し、続いて湿式洗浄塔に導
入して排ガス中の有害成分を除去する方法であって、前
記湿式洗浄塔は少なくとも、薬液を噴霧して排ガス中の
酸性成分を除去する薬液噴霧部と、該噴霧部を経た排ガ
スを冷却し該排ガス中のミストを回収して減湿し、減湿
水を循環使用する減湿部とからなり、該減湿部で生じる
減湿水の少なくとも一部を、前記排ガス減温塔の噴霧水
に用いるようにしたものである。(1) In an exhaust gas treatment method according to the present invention, exhaust gas containing harmful components is introduced into a water spray type exhaust gas cooling tower, cooled, and then introduced into a dust collector. A method for removing soot and dust in exhaust gas, and subsequently removing the harmful components in the exhaust gas by introducing the same into a wet cleaning tower, wherein the wet cleaning tower at least removes an acidic component in the exhaust gas by spraying a chemical solution. A dehumidifying section comprising a chemical spraying section and a dehumidifying section which cools exhaust gas passing through the spraying section, collects mist in the exhaust gas and dehumidifies the dehumidified water, and circulates and uses dehumidified water. Is used as spray water for the exhaust gas cooling tower.
【０００９】このように、湿式洗浄塔で循環使用する減
湿水の少なくとも一部を、前段の排ガス減温塔に用いる
ので、減湿水の有効利用が図れるとともに、高価な上水
を利用する場合はその使用量を少なくすることができ
る。また、排ガス減温塔の入口温度が例えば３００℃以
上である場合は、減湿水にダイオキシン類を含んでいる
場合でも、減湿水中のダイオキシンの除去効果がある程
度得られる。As described above, since at least a portion of the dehumidified water circulated and used in the wet washing tower is used for the exhaust gas temperature reduction tower in the preceding stage, effective use of the dehumidified water is achieved and expensive water is used. In that case, the amount used can be reduced. Further, when the inlet temperature of the exhaust gas temperature reduction tower is, for example, 300 ° C. or more, even if dioxins are contained in the dehumidified water, the effect of removing dioxins in the dehumidified water can be obtained to some extent.
【００１０】（２） 上記（１）の排ガス処理方法にお
いて、湿式洗浄塔の減湿部で回収された減湿水の少なく
とも一部をダイオキシン除去装置に導入して減湿水中の
ダイオキシンを取り除いたあと、減湿水として循環使用
するか、前記排ガス減温塔の噴霧水に用いる。(2) In the exhaust gas treatment method of the above (1), at least a part of the dehumidified water collected in the dehumidifying section of the wet washing tower is introduced into a dioxin removing device to remove dioxin in the dehumidified water. Then, it is circulated for use as dehumidifying water or used as spray water for the exhaust gas cooling tower.
【００１１】このように、ダイオキシン類を含む恐れの
多い減湿水の少なくとも一部に対してダイオキシン除去
処理を実施するので、湿式洗浄塔で循環使用する際の、
減湿水中のダイオキシン類濃度が上昇することなく、さ
らには、減湿水中のダイオキシン類が排ガス中に移行し
て排ガス中のダイオキシン類濃度を上昇させることがな
いので、公害防止上有効である。ダイオキシン除去処理
を実施したあと、排ガス減温塔の噴霧水として用いる場
合は、被冷却排ガスの温度が例えば２００℃〜３００℃
のダイオキシン再合成領域の温度であっても、排ガス中
のダイオキシン類が上昇するのを防止することができ
る。As described above, since the dioxin removal treatment is performed on at least a part of the dehumidifying water which is likely to contain dioxins, the dioxin removal treatment is performed when the dehumidified water is circulated and used in the wet washing tower.
Since the concentration of dioxins in the dehumidified water does not increase and the dioxins in the dehumidified water do not migrate into the exhaust gas to increase the concentration of the dioxins in the exhaust gas, it is effective in preventing pollution. After the dioxin removal treatment, when used as spray water for an exhaust gas cooling tower, the temperature of the exhaust gas to be cooled is, for example, 200 ° C to 300 ° C.
Even when the temperature is in the dioxin resynthesis region, it is possible to prevent the dioxins in the exhaust gas from rising.
【００１２】（３） 上記（２）の排ガス処理方法にお
いて、ダイオキシン除去装置は、凝集沈殿装置、砂ろ過
装置、膜ろ過装置、吸着剤充填装置、触媒分解装置、電
気分解装置、紫外線照射装置、マイクロ波照射装置、オ
ゾン処理装置、から選ばれた少なくとも一つの装置であ
る。(3) In the exhaust gas treatment method of the above (2), the dioxin removing device includes a coagulating sedimentation device, a sand filtration device, a membrane filtration device, an adsorbent filling device, a catalyst decomposition device, an electrolysis device, an ultraviolet irradiation device, At least one device selected from a microwave irradiation device and an ozone treatment device.
【００１３】排水（減湿水）中のダイオキシン類は、そ
の多くが微細な固形分（以下、ＳＳという）によるもの
が多く、溶解性のダイオキシン類は相対的に少ないが、
高度に処理する場合は無視できない。したがって、ま
ず、凝集沈殿装置、砂ろ過装置、膜ろ過装置、吸着剤充
填装置から選ばれた手段により、排水中のＳＳ成分を除
去することが望ましい。吸着材充填装置としては所定の
細孔を有する活性炭などが選ばれ、ＳＳ除去とともに溶
解性ダイオキシン類の除去にも効果がある。ＳＳ由来の
ダイオキシンだけでなく、溶解性のダイオキシン類の除
去には、ダイオキシン分解装置として、触媒分解装置、
電気分解装置、紫外線照射装置、マイクロ波照射装置、
オゾン処理装置の各種原理による装置が選ばれる。これ
らの装置は、複数組み合わせることが可能であり、その
効果は相乗的となり、上記（２）に係る発明の作用をよ
り確実とすることができる。また、上記のように減湿水
のダイオキシンを除去する際に、微細なＳＳ分も除去さ
れるので、排ガス減温塔で減湿水を噴霧する際、スプレ
ーノズルのＳＳ分による目詰まりを回避できる。Most of dioxins in waste water (dehumidified water) are based on fine solids (hereinafter referred to as SS), and relatively few soluble dioxins are contained.
In case of advanced processing, it cannot be ignored. Therefore, first, it is desirable to remove the SS component in the wastewater by means selected from a coagulation sedimentation device, a sand filtration device, a membrane filtration device, and an adsorbent filling device. Activated carbon or the like having predetermined pores is selected as the adsorbent filling device, and is effective in removing soluble dioxins as well as removing SS. In order to remove not only dioxins derived from SS but also soluble dioxins, a catalytic decomposition device,
Electrolysis equipment, ultraviolet irradiation equipment, microwave irradiation equipment,
Devices based on various principles of the ozone treatment device are selected. It is possible to combine a plurality of these devices, the effects of which are synergistic, and the operation of the invention according to the above (2) can be further ensured. In addition, when dioxin is removed from the dehumidifying water as described above, fine SS components are also removed. Therefore, when spraying dehumidifying water with an exhaust gas temperature reduction tower, clogging due to SS components of the spray nozzle is avoided. it can.
【００１４】（４） 本発明にかかる排ガス処理装置
は、少なくとも、有害成分を含む排ガスを冷却する水噴
霧式の排ガス減温塔と、排ガス中のばいじんを除去する
集塵装置と、薬液を噴霧して排ガス中の酸性成分を除去
する薬液噴霧部および該噴霧部を経た排ガスを冷却し該
排ガス中のミストを回収して減湿し、減湿水を循環使用
する減湿部からなる湿式洗浄塔と、該湿式洗浄塔の減湿
部で循環使用する減湿水の一部を分岐して、前記排ガス
減温塔に導入する減湿水供給管、とからなるものであ
る。このように装置を構成すれば、上記（１）に係る発
明の作用・効果を奏する排ガス処理装置を容易に構成で
きる。(4) An exhaust gas treating apparatus according to the present invention comprises at least a water spray type exhaust gas cooling tower for cooling exhaust gas containing harmful components, a dust collecting device for removing dust and soot in the exhaust gas, and a chemical liquid spray. Wet cleaning comprising a chemical spraying section for removing acidic components in exhaust gas and cooling the exhaust gas passing through the spraying section, collecting mist in the exhaust gas to dehumidify the water, and circulating and using dehumidified water. A tower, and a dehumidification water supply pipe for branching a part of the dehumidification water to be circulated and used in the dehumidification section of the wet cleaning tower and introducing the dehumidification water to the exhaust gas temperature reduction tower. By configuring the apparatus in this way, it is possible to easily configure an exhaust gas treatment apparatus having the functions and effects of the invention according to the above (1).
【００１５】（５） 上記（４）の排ガス処理装置にお
いて、減湿水を排ガス減温塔に導入する前に、該減湿水
中のダイオキシンを除去するためのダイオキシン除去装
置を設置した。このように装置を構成すれば、上記
（２）に係る発明の作用・効果を奏する排ガス処理装置
を容易に構成できる。(5) In the exhaust gas treatment apparatus of the above (4), before introducing the dehumidified water into the exhaust gas cooling tower, a dioxin removing device for removing dioxin in the dehumidified water is installed. By configuring the apparatus in this way, it is possible to easily configure an exhaust gas treatment apparatus having the functions and effects of the invention according to the above (2).
【００１６】[0016]
【発明の実施の形態】［実施の形態１］図１は本発明の
実施の形態１に係る排ガス処理方法を示す説明図であ
る。１は排ガス減温塔、２は集塵装置、３は湿式洗浄塔
で、３ａは薬液噴霧部、３ｂは減湿部である。４は減湿
水槽および減湿水冷却器、５は減湿水供給管、Ａは流量
調整弁である。なお、これらの図は説明の都合上、概略
フローを記載したので、灰処理系統、各種制御機器、誘
引ファン等の周辺機器の記載は省略してある。[First Embodiment] FIG. 1 is an explanatory diagram showing an exhaust gas treatment method according to a first embodiment of the present invention. 1 is an exhaust gas cooling tower, 2 is a dust collector, 3 is a wet cleaning tower, 3a is a chemical spraying section, and 3b is a dehumidifying section. 4 is a dehumidification water tank and a dehumidification water cooler, 5 is a dehumidification water supply pipe, and A is a flow control valve. Note that, for the sake of explanation, the schematic flow is illustrated in these figures, and the illustration of peripheral devices such as an ash processing system, various control devices, and an induction fan is omitted.
【００１７】図に示すように、焼却炉および熱回収手段
であるボイラ等を経た、例えば２５０℃〜３５０℃の排
ガスは、排ガス減温塔１に導入されて、水噴霧によりダ
イオキシンの発生の少ない２００℃以下、望ましくは１
８０℃以下の温度に冷却される。排ガス減温塔１で噴霧
する水は、後述する湿式洗浄塔３から生じる減湿水を用
い、必要に応じて、外部からの上水、施設内の再利用水
を用いる。As shown in the figure, exhaust gas of, for example, 250 ° C. to 350 ° C., which has passed through an incinerator and a boiler as a heat recovery means, is introduced into an exhaust gas temperature-reducing tower 1 and generates less dioxin due to water spray. 200 ° C or less, preferably 1
It is cooled to a temperature below 80 ° C. As the water to be sprayed in the exhaust gas cooling tower 1, dehumidified water generated from a wet washing tower 3 described later is used, and if necessary, external tap water and reused water in the facility are used.
【００１８】排ガス減温塔１で所定温度に冷却された排
ガスは、バグフィルタ等の集塵装置２に導入され、排ガ
スに含まれるばいじん（飛灰）が除去される。このと
き、図示しないが後段の湿式洗浄塔３の負荷を低減させ
るため、必要に応じて、集塵装置２入口にて排ガス中の
酸性成分除去のための消石灰粉や、排ガス中のダイオキ
シン類除去のための活性炭粉が噴霧され、集塵装置２の
集塵過程でこれらの有害物質はばいじんとともに除去さ
れる。The exhaust gas cooled to a predetermined temperature in the exhaust gas cooling tower 1 is introduced into a dust collecting device 2 such as a bag filter to remove soot (fly ash) contained in the exhaust gas. At this time, though not shown, slaked lime powder for removing acidic components in the exhaust gas and dioxins in the exhaust gas are removed at the inlet of the dust collecting device 2 as necessary in order to reduce the load on the subsequent wet washing tower 3. Activated carbon powder is sprayed, and these harmful substances are removed together with soot and dust in the dust collecting process of the dust collecting device 2.
【００１９】次に集塵装置２を経た排ガスは湿式洗浄塔
３に導入され、薬液噴霧部３ａにて排ガス中の酸性成分
吸収のための苛性ソーダ水溶液（ＮａＯＨ溶液）が排ガ
スに散布され、酸性成分が除去される。図示しないが薬
液を循環噴霧するポンプが設置されて循環噴霧され、噴
霧する薬液はｐＨ８程度に調整がなされる。なお、苛性
ソーダ貯槽、希釈槽、薬液の処理槽等は別途設置される
が説明を省略する。Next, the flue gas that has passed through the dust collector 2 is introduced into the wet washing tower 3, and a caustic soda aqueous solution (NaOH solution) for absorbing acidic components in the flue gas is sprayed on the flue gas in the chemical spraying section 3 a, Is removed. Although not shown, a pump for circulating and spraying the chemical is installed and circulated and sprayed, and the sprayed chemical is adjusted to about pH 8. In addition, a caustic soda storage tank, a dilution tank, a treatment tank for a chemical solution, and the like are separately provided, but description thereof is omitted.
【００２０】次に、排ガスは湿式洗浄塔３の上部の減湿
部３ｂに導入され、減湿水槽および減湿水冷却器４から
の減湿水を噴霧することにより排ガスが冷却される過程
で、排ガス中の水分が凝縮し、ミストとなって減湿水と
して回収される。回収する手段は、図示しないミストセ
パレータ、エリミネータ等が減湿部３ｂに設置されるこ
とによりなされる。減湿部３ｂにて凝縮し回収した減湿
水は循環使用のため、一時、減湿水槽および減湿水冷却
器４に貯留されるが、再利用する減湿水の少なくとも一
部は、流量調整弁Ａ、減湿水供給管５を介して、上流の
排ガス減温塔１に導入され、図示しないスプレーノズル
により、排ガス減温塔１内の排ガスに噴霧される。Next, the exhaust gas is introduced into the dehumidifying section 3b at the upper part of the wet washing tower 3, and the exhaust gas is cooled by spraying the dehumidified water from the dehumidified water tank and the dehumidified water cooler 4. Then, the moisture in the exhaust gas is condensed and becomes mist and is recovered as dehumidified water. The collecting means is achieved by installing a mist separator, an eliminator (not shown) and the like in the dehumidifying section 3b. The dehumidified water condensed and recovered in the dehumidifying section 3b is temporarily stored in the dehumidified water tank and the dehumidified water cooler 4 for circulation use. The gas is introduced into the exhaust gas cooling tower 1 via the regulating valve A and the dehumidification water supply pipe 5, and is sprayed on the exhaust gas in the exhaust gas cooling tower 1 by a spray nozzle (not shown).
【００２１】このように、湿式洗浄塔３で循環使用する
減湿水の少なくとも一部を、前段の排ガス減温塔１の噴
霧水として用いるので、減湿水の有効利用が図れるとと
もに、高価な上水を利用する場合はその使用量を少なく
することができる。また、排ガス減温塔１の入口温度が
例えば３００℃以上である場合は、減湿水にダイオキシ
ン類を含んでいる場合でも、減湿水中のダイオキシンの
除去効果がある程度得られる。次に湿式洗浄塔３を経た
排ガスは、必要に応じて白煙防止等の再加熱手段により
再加熱がなされたあと、大気中に放散される。As described above, since at least a part of the dehumidified water circulated and used in the wet washing tower 3 is used as the spray water of the exhaust gas degassing tower 1 in the preceding stage, the dehumidified water can be effectively used and expensive. When tap water is used, the amount used can be reduced. Further, when the inlet temperature of the exhaust gas temperature reduction tower 1 is, for example, 300 ° C. or higher, even if the dehumidification water contains dioxins, the effect of removing dioxin from the dehumidification water can be obtained to some extent. Next, the exhaust gas that has passed through the wet washing tower 3 is re-heated by re-heating means such as white smoke prevention if necessary, and then is emitted into the atmosphere.
【００２２】［実施の形態２］図２は本発明の実施の形
態２に係る排ガス処理方法を示す説明図である。なお図
１と同一部分には同じ符号を付し、説明を省略する。６
はダイオキシン除去装置で、湿式洗浄塔３から回収され
た減湿水は減湿水槽および減湿水冷却器４に導入され、
その後、少なくともその一部がダイオキシン除去装置６
に導入される。なお、ダイオキシン除去装置６は、減湿
水槽および減湿水冷却器４の前か、減湿水槽と減湿水冷
却器の間に設置してもよい。ダイオキシン除去装置６に
導入された減湿水は、この減湿水に含まれるダイオキシ
ン類が除去されて、その後、図１と同様に、排ガス減温
塔１に導入される。[Embodiment 2] FIG. 2 is an explanatory view showing an exhaust gas treatment method according to Embodiment 2 of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. 6
Is a dioxin removal device, and dehumidified water recovered from the wet washing tower 3 is introduced into a dehumidified water tank and a dehumidified water cooler 4,
Then, at least a part of the dioxin removal device 6
Will be introduced. The dioxin removing device 6 may be installed before the dehumidifying water tank and the dehumidifying water cooler 4 or between the dehumidifying water tank and the dehumidifying water cooler. From the dehumidified water introduced into the dioxin removing device 6, dioxins contained in the dehumidified water are removed, and thereafter, the dehumidified water is introduced into the exhaust gas temperature reducing tower 1 as in FIG.
【００２３】このように、ダイオキシン類を含む恐れの
多い減湿水の少なくとも一部に対してダイオキシン除去
処理を実施するので、湿式洗浄塔３で循環使用する際
の、減湿水中のダイオキシン類濃度が上昇することな
く、さらには、減湿水中のダイオキシン類が排ガス中に
移行して排ガス中のダイオキシン類濃度を上昇させるこ
とがないので、公害防止上有効である。ダイオキシン除
去処理を実施したあと、排ガス減温塔１の噴霧水として
用いる場合は、被冷却排ガスの温度が例えば２００℃〜
３００℃のダイオキシン再合成領域の温度であっても、
排ガス中のダイオキシン類が上昇するのを防止すること
ができる。As described above, the dioxin removal treatment is performed on at least a part of the dehumidified water that is likely to contain dioxins. Therefore, the concentration of dioxins in the dehumidified water when the dehumidified water is circulated in the wet washing tower 3 is used. The dioxins in the dehumidified water do not migrate into the exhaust gas and do not increase the concentration of the dioxins in the exhaust gas, which is effective in preventing pollution. After the dioxin removal treatment, when used as spray water for the exhaust gas cooling tower 1, the temperature of the exhaust gas to be cooled is, for example, 200 ° C.
Even at a temperature of the dioxin resynthesis region of 300 ° C.,
Dioxins in exhaust gas can be prevented from rising.
【００２４】ダイオキシン除去装置６は、凝集沈殿装
置、砂ろ過装置、膜ろ過装置、吸着剤充填装置、触媒分
解装置、電気分解装置、紫外線照射装置、マイクロ波照
射装置、オゾン処理装置、から選ばれた少なくとも一つ
の装置を用いることが好適である。The dioxin removing device 6 is selected from a coagulating sedimentation device, a sand filtration device, a membrane filtration device, an adsorbent filling device, a catalytic decomposition device, an electrolysis device, an ultraviolet irradiation device, a microwave irradiation device, and an ozone treatment device. Preferably, at least one device is used.
【００２５】排水（減湿水）中のダイオキシン類は、そ
の多くが微細な固形分（ＳＳ）によるものが多く、溶解
性のダイオキシン類は相対的に少ないが、高度に処理す
る場合は無視できない。したがって、まず、凝集沈殿装
置、砂ろ過装置、膜ろ過装置、吸着剤充填装置から選ば
れた手段により、排水中のＳＳ成分を除去することが望
ましい。吸着材充填装置としては所定の細孔を有する活
性炭などが選ばれ、ＳＳ除去とともに溶解性ダイオキシ
ン類の除去にも効果がある。ＳＳ由来のダイオキシンだ
けでなく、溶解性のダイオキシン類の除去には、ダイオ
キシン分解装置として、触媒分解装置、電気分解装置、
紫外線照射装置、マイクロ波照射装置、オゾン処理装置
の各種原理による装置が選ばれる。これらの装置は、複
数組み合わせることが可能であり、その効果は相乗的と
なり、上記の発明の作用をより確実とすることができ
る。また、上記のように減湿水のダイオキシンを除去す
る際に、微細なＳＳ分も除去されるので、排ガス減温塔
１で減湿水を噴霧する際、スプレーノズルのＳＳ分によ
る目詰まりを回避できる。Most of the dioxins in the waste water (dehumidified water) are based on fine solids (SS), and the amount of soluble dioxins is relatively small. . Therefore, first, it is desirable to remove the SS component in the wastewater by means selected from a coagulation sedimentation device, a sand filtration device, a membrane filtration device, and an adsorbent filling device. Activated carbon or the like having predetermined pores is selected as the adsorbent filling device, and is effective in removing soluble dioxins as well as removing SS. In order to remove not only dioxins derived from SS but also soluble dioxins, catalyst decomposition equipment, electrolysis equipment,
Devices based on various principles such as an ultraviolet irradiation device, a microwave irradiation device, and an ozone treatment device are selected. A plurality of these devices can be combined, the effects of which are synergistic, and the effects of the above-described invention can be further ensured. In addition, when dioxin is removed from the dehumidifying water as described above, fine SS components are also removed. Therefore, when the dehumidifying water is sprayed in the exhaust gas temperature reduction tower 1, clogging due to the SS component of the spray nozzle is prevented. Can be avoided.
【００２６】凝集沈殿装置は、硫酸バンド、塩化第二鉄
等の凝集剤を用い、必要に応じてｐＨ処理を事前に行
い、主に、減湿水中の微細な浮遊物質（ＳＳ）を取り除
く。砂ろ過装置は、所定粒度のケイ砂等が充填されたろ
過装置で、ＳＳ分を主に取り除く。膜ろ過装置は、精度
よく調整された水ろ過用の膜を用い、必要に応じて逆洗
を行う。主に、ダイオキシンを多く含むＳＳ成分を除去
するが、膜に触媒機能、吸着機能、酸化機能を担持させ
ることにより、溶解性ダイオキシンの除去も可能とな
る。The coagulation sedimentation apparatus uses a coagulant such as a sulfuric acid band or ferric chloride to perform a pH treatment beforehand as necessary, and mainly removes fine suspended solids (SS) in dehumidified water. The sand filtration device is a filtration device filled with silica sand or the like having a predetermined particle size, and mainly removes SS. The membrane filtration device uses a precisely adjusted membrane for water filtration, and performs backwashing as necessary. Mainly, the SS component containing a large amount of dioxin is removed. However, by allowing the membrane to carry a catalytic function, an adsorbing function, and an oxidizing function, soluble dioxin can be removed.
【００２７】吸着剤充填装置は、所定の細孔を有する活
性炭などが選ばれ、活性炭が充填された層に処理水を流
通させることにより、ＳＳ分除去とともに溶解性ダイオ
キシン類の除去を行う。電気分解装置は、槽の中に複数
の電極を浸し、通電する際の電気分解作用を用いて、Ｓ
Ｓ由来および溶解性のダイオキシンを分解する。紫外線
照射装置は、ＵＶ発生機構を槽に設置し、排水に直接照
射してＳＳ由来および溶融性のダイオキシンを分解す
る。In the adsorbent filling apparatus, activated carbon having predetermined pores or the like is selected, and the treated dioxin is removed together with the removal of SS by flowing treated water through a layer filled with activated carbon. The electrolyzer uses the electrolysis effect when a plurality of electrodes are immersed in a tank and energized,
Decomposes S-derived and soluble dioxins. The ultraviolet irradiation device has a UV generating mechanism installed in a tank, and directly irradiates wastewater to decompose SS-derived and fusible dioxin.
【００２８】マイクロ波照射装置は、所定波長のマイク
ロ波（例えば２．４５ＧＨｚ）を照射する機構を槽に備
え、排水に直接照射してＳＳ由来および溶解性のダイオ
キシンを分解する。オゾン分解装置は、オゾン発生器を
水槽に設置し、水槽にオゾンを流通させることにより、
主に酸化促進により、ＳＳ由来および溶解性のダイオキ
シンを分解する。これら、各種のダイオキシン除去装置
６は、温度、圧力、電力、ｐＨ、処理量を制御する各種
の制御装置が適宜組み込まれる。また、ダイオキシン除
去効果を大きくするため、これら複数組み合わせること
が可能である。The microwave irradiator is provided with a mechanism for irradiating a microwave of a predetermined wavelength (for example, 2.45 GHz) in a tank, and directly irradiates wastewater to decompose SS-derived and soluble dioxin. The ozone decomposer is equipped with an ozone generator in a water tank and circulates ozone through the water tank.
Decomposes SS-derived and soluble dioxins mainly by accelerating oxidation. These various dioxin removal devices 6 incorporate various control devices for controlling the temperature, pressure, electric power, pH, and throughput as appropriate. Further, in order to increase the dioxin removal effect, a plurality of these can be combined.
【００２９】上記の説明では、減湿水の一部を排ガス減
温塔１の噴霧に用いた場合を示したが全量を用いてもよ
く、また、排ガス減温塔１の噴霧水の流量調整のため、
一部に再利用水又は上水を用いてもよい（図１、図２の
破線）。本発明の構成要素である湿式洗浄塔３は、薬液
として苛性ソーダ（ＮａＯＨ）を例示したが、これにか
ぎらず、酸性成分を除去できるアルカリ性の薬剤で、水
溶性または水を懸濁物とすることが可能であれば採用で
き、例示のＮａＯＨ以外に、例えばＮａ2 ＣＯ3 、Ｎａ
ＨＣＯ3 、Ｃａ（ＯＨ）2 、などを用いてもよい。ま
た、湿式洗浄塔３の直前に小型の予備洗浄塔を設置し、
同等に薬液噴霧を行い、同塔からの底部廃液を湿式洗浄
塔３に混入させる方式もしばしば採用されるが、本明細
書では記載を省略した。In the above description, a case where a part of the dehumidified water is used for spraying the exhaust gas temperature-reducing tower 1 is shown, but the entire amount may be used. for,
Reused water or clean water may be used in part (broken lines in FIGS. 1 and 2). In the wet washing tower 3 which is a component of the present invention, caustic soda (NaOH) is exemplified as the chemical solution. However, the chemical washing solution is not limited to this, and an alkaline chemical capable of removing an acidic component is used. Can be adopted if possible. In addition to the exemplified NaOH, for example, Na 2 CO 3 , Na
HCO 3 , Ca (OH) 2 , or the like may be used. In addition, a small pre-cleaning tower is installed just before the wet cleaning tower 3,
A method of equally spraying a chemical solution and mixing the bottom waste liquid from the tower into the wet washing tower 3 is often adopted, but the description is omitted in this specification.
【００３０】本発明の構成要素である排ガス減温塔１
は、水噴霧式であればよく、水噴霧はスプレーノズルを
用い、特に微細な水滴の得られる空気との二流体スプレ
ーノズルを用いることが望ましい。また、本発明の構成
要素である集塵装置２は、織り布、フェルト等を用いた
バグフィルタ装置、セラミック材を用いたセラミックフ
ィルタ装置等のろ過式集塵装置であれば、ダイオキシン
の再合成の恐れが少なく、集塵効率が相対的に高いので
望ましいが、電気集塵機その他の集塵手段であっても採
用できる。本発明は、焼却、加熱、溶融等の各種操作か
ら排出され、酸性成分やダイオキシン類等の有害成分を
含む排ガスを少なくとも湿式洗浄塔３を用いて処理する
施設であれば適用でき、上記に限定されない。Exhaust gas cooling tower 1 which is a component of the present invention
May be a water spray type, and the water spray uses a spray nozzle, and particularly preferably uses a two-fluid spray nozzle with air from which fine water droplets can be obtained. Further, the dust collecting device 2 which is a component of the present invention is a filter type dust collecting device such as a bag filter device using a woven cloth, a felt or the like, and a ceramic filter device using a ceramic material. It is desirable because there is little fear of dust collection and the dust collection efficiency is relatively high. However, an electric dust collector or other dust collecting means can also be employed. The present invention can be applied to any facility that treats exhaust gas discharged from various operations such as incineration, heating, melting and the like and containing harmful components such as acidic components and dioxins using at least the wet cleaning tower 3, and is limited to the above. Not done.
【００３１】本発明で述べた排ガスおよび減湿水に含ま
れるダイオキシン（類）とは、広く有機ハロゲン化合物
を代表し、有機ハロゲン化合物とは、厚生労働省および
環境省により清掃工場の排出規制値や環境中の規制値が
毒性換算値により指定されているダイオキシン類およ
び、ダイオキシン類の前駆物質、関連物質と称されるク
ロロベンゼン、クロロフェノール、ＰＣＢなどや、塩素
以外のハロゲン元素で一部が置換されたこれら化学物質
の総称である。さらに、ダイオキシン類とは、ポリジベ
ンゾパラジオキシンとポリジベンゾフランの総称であっ
て、通常毒性換算濃度によって評価されるものである。
本明細書においては、上記の有機ハロゲン化合物やダイ
オキシン類を単にダイオキシンと略記した。The dioxin (s) contained in the exhaust gas and the dehumidified water described in the present invention widely represent organic halogen compounds, and the term "organic halogen compounds" refers to emission control values of wastewater treatment plants by the Ministry of Health, Labor and Welfare and the Ministry of the Environment. Dioxins whose environmental regulation values are specified by toxicity conversion values, and precursors of dioxins, and related substances such as chlorobenzene, chlorophenol, PCB, and other elements that are partially substituted with halogen elements other than chlorine It is a general term for these chemical substances. Further, dioxins are a general term for polydibenzoparadioxin and polydibenzofuran, and are usually evaluated based on toxic equivalent concentrations.
In this specification, the above organic halogen compounds and dioxins are simply abbreviated as dioxins.
【００３２】[0032]
【発明の効果】本発明によれば、有害成分を含む排ガス
を水噴霧式の排ガス減温塔に導入して冷却し、ついで集
塵装置に導入して排ガス中のばいじんを除去し、続いて
湿式洗浄塔に導入して排ガス中の有害成分を除去する方
法において、前記湿式洗浄塔は少なくとも、薬液を噴霧
して排ガス中の酸性成分を除去する薬液噴霧部と、該噴
霧部を経た排ガスを冷却し該排ガス中のミストを回収し
て減湿し、減湿水を循環使用する減湿部とからなり、該
減湿部で生じる減湿水の少なくとも一部を、前記排ガス
減温塔の噴霧水に用いるようにしたので、減湿水の有効
利用が図れるとともに、高価な上水を利用する場合はそ
の使用量を少なくできる効果が得られる。また、排ガス
減温塔の入口温度が例えば３００℃以上である場合は、
減湿水にダイオキシン類を含んでいる場合でも、減湿水
中のダイオキシンをある程度除去することができる。According to the present invention, exhaust gas containing harmful components is introduced into a water spray type exhaust gas cooling tower, cooled, and then introduced into a dust collector to remove soot from the exhaust gas. In the method of removing harmful components in the exhaust gas by introducing the exhaust gas into the wet cleaning tower, the wet cleaning tower at least, a chemical spray unit that removes acidic components in the exhaust gas by spraying a chemical solution, the exhaust gas passing through the spray unit A dehumidifying section that cools and collects mist in the exhaust gas and dehumidifies it, and comprises a dehumidifying section that circulates and uses the dehumidifying water. Since it is used for spray water, effective use of dehumidified water can be achieved, and when expensive tap water is used, the amount of water used can be reduced. When the inlet temperature of the exhaust gas cooling tower is, for example, 300 ° C. or more,
Even when dioxins are contained in the dehumidified water, dioxins in the dehumidified water can be removed to some extent.
【００３３】また、本発明によれば、湿式洗浄塔の減湿
部で回収された減湿水の少なくとも一部をダイオキシン
除去装置に導入して減湿水中のダイオキシンを取り除い
たあと、減湿水として循環使用するか、前記排ガス減温
塔の噴霧水に用いるので、湿式洗浄塔で循環使用する際
の、減湿水中のダイオキシン類濃度が上昇することな
く、さらには、減湿水中のダイオキシン類が排ガス中に
移行して排ガス中のダイオキシン類濃度を上昇させるこ
とないので、公害防止上の効果が得られる。また、ダイ
オキシン除去処理を実施したあと、排ガス減温塔の噴霧
水として用いる場合は、被冷却排ガスの温度が例えば２
００℃〜３００℃のダイオキシン再合成領域の温度であ
っても、排ガス中のダイオキシン類が上昇することを防
止できる効果がある。According to the present invention, at least a part of the dehumidified water collected in the dehumidification section of the wet washing tower is introduced into the dioxin removing device to remove dioxin in the dehumidified water, and then the dehumidified water is removed. Or used as spray water of the exhaust gas temperature reduction tower, so that the dioxins concentration in the dehumidification water does not increase when used in circulation in the wet cleaning tower, and further, the dioxins in the dehumidification water Does not move into the exhaust gas to increase the concentration of dioxins in the exhaust gas, so that an effect of preventing pollution can be obtained. In addition, after the dioxin removal treatment is performed, when the exhaust gas is used as spray water for the exhaust gas cooling tower, the temperature of the exhaust gas to be cooled is set to, for example, 2.
Even at a temperature of the dioxin resynthesis region of 00 ° C to 300 ° C, there is an effect that dioxins in the exhaust gas can be prevented from rising.
【００３４】さらに、本発明によれば、ダイオキシン除
去装置は、凝集沈殿装置、砂ろ過装置、膜ろ過装置、吸
着剤充填装置、触媒分解装置、電気分解装置、紫外線照
射装置、マイクロ波照射装置、オゾン処理装置、から選
ばれた少なくとも一つの装置としたので、排水（減湿
水）中のダイオキシン類を効率よく除去でき、以て上記
の発明の効果をより確実とすることができる。また、上
記のように減湿水のダイオキシンを除去する際に、微細
なＳＳ分も除去されるので、排ガス減温塔で減湿水を噴
霧する際、スプレーノズルのＳＳ分による目詰まりを回
避できる。Further, according to the present invention, the dioxin removing device includes a coagulating sedimentation device, a sand filtration device, a membrane filtration device, an adsorbent filling device, a catalyst decomposition device, an electrolysis device, an ultraviolet irradiation device, a microwave irradiation device, Since at least one device selected from the ozone treatment device is used, dioxins in wastewater (dehumidified water) can be efficiently removed, and the effects of the above-described invention can be further ensured. In addition, when dioxin is removed from the dehumidifying water as described above, fine SS components are also removed. Therefore, when spraying dehumidifying water with an exhaust gas temperature reduction tower, clogging due to SS components of the spray nozzle is avoided. it can.
【００３５】また、本発明によれば、排ガス処理装置
は、少なくとも、有害成分を含む排ガスを冷却する水噴
霧式の排ガス減温塔と、排ガス中のばいじんを除去する
集塵装置と、薬液を噴霧して排ガス中の酸性成分を除去
する薬液噴霧部および該噴霧部を経た排ガスを冷却し該
排ガス中のミストを回収して減湿し、減湿水を循環使用
する減湿部からなる湿式洗浄塔と、該湿式洗浄塔の減湿
部で循環使用する減湿水の一部を分岐して、前記排ガス
減温塔に導入する減湿水供給管、とからなるものとした
ので、減湿水の有効利用が図れるとともに、高価な上水
を利用する場合はその使用量を少なくできる効果が得ら
れる。また、排ガス減温塔の入口温度が例えば３００℃
以上である場合は、減湿水にダイオキシン類を含んでい
る場合でも、減湿水中のダイオキシンをある程度除去す
ることができる。Further, according to the present invention, the exhaust gas treatment apparatus comprises at least a water spray type exhaust gas cooling tower for cooling the exhaust gas containing harmful components, a dust collecting device for removing soot in the exhaust gas, and a chemical solution. A wet type comprising a chemical spraying section for removing acidic components in exhaust gas by spraying, and cooling the exhaust gas passing through the spraying section, collecting mist in the exhaust gas to dehumidify, and circulating and using dehumidified water. Since the washing tower and a dehumidifying water supply pipe for branching a part of the dehumidifying water to be circulated and used in the dehumidifying section of the wet washing tower and introducing the dehumidifying water to the exhaust gas temperature reducing tower, Effective use of wet water can be achieved, and when expensive tap water is used, the amount of water used can be reduced. Further, the inlet temperature of the exhaust gas cooling tower is, for example, 300 ° C.
In the case described above, the dioxin in the dehumidified water can be removed to some extent even when the dehumidified water contains dioxins.
【００３６】さらに、本発明によれば、排ガス処理装置
において、減湿水を排ガス減温塔に導入する前に、該減
湿水中のダイオキシンを除去するためのダイオキシン除
去装置を設置したので、湿式洗浄塔で循環使用する際
の、減湿水中のダイオキシン類濃度が上昇することな
く、さらには、減湿水中のダイオキシン類が排ガス中に
移行して排ガス中のダイオキシン類濃度を上昇させるこ
とないため、公害防止上の効果が得られる。また、ダイ
オキシン除去処理を実施したあと、排ガス減温塔の噴霧
水として用いる場合は、被冷却排ガスの温度が例えば２
００℃〜３００℃のダイオキシン再合成領域の温度であ
っても、排ガス中のダイオキシン類が上昇することを防
止できる効果がある。Further, according to the present invention, the dioxin removal device for removing dioxin in the dehumidified water is installed in the exhaust gas treatment device before introducing the dehumidified water into the exhaust gas temperature reduction tower. The dioxin concentration in the dehumidified water does not increase when recycled in the washing tower, and furthermore, the dioxin in the dehumidified water does not migrate into the exhaust gas and increase the dioxin concentration in the exhaust gas. The effect on pollution prevention can be obtained. In addition, after the dioxin removal treatment is performed, when the exhaust gas is used as spray water for the exhaust gas cooling tower, the temperature of the exhaust gas to be cooled is set to, for example, 2%.
Even at a temperature of the dioxin resynthesis region of 00 ° C to 300 ° C, there is an effect that dioxins in the exhaust gas can be prevented from rising.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の実施の形態１に係る排ガス処理方法の
説明図である。FIG. 1 is an explanatory diagram of an exhaust gas treatment method according to Embodiment 1 of the present invention.
【図２】本発明の実施の形態２に係る排ガス処理方法の
説明図である。FIG. 2 is an explanatory diagram of an exhaust gas treatment method according to Embodiment 2 of the present invention.
【図３】従来の排ガス処理方法の一例を示す説明図であ
る。FIG. 3 is an explanatory view showing an example of a conventional exhaust gas treatment method.
１ 排ガス減温塔 ２ 集塵装置 ３ 湿式洗浄塔 ３ａ 薬液噴霧部 ３ｂ 減湿部 ４ 減湿水槽および減湿水冷却器 ５ 減湿水供給管 ６ ダイオキシン除去装置 Ａ 流量調整弁 DESCRIPTION OF SYMBOLS 1 Exhaust gas temperature reduction tower 2 Dust collector 3 Wet washing tower 3a Chemical liquid spray part 3b Dehumidification part 4 Dehumidification water tank and dehumidification water cooler 5 Dehumidification water supply pipe 6 Dioxin removal device A Flow control valve
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ０１Ｄ 53/34 ＺＡＢ Ｃ０２Ｆ 1/34 ４Ｄ０３７ 53/40 1/44 Ｆ ４Ｄ０４１ 53/77 1/46 Ｚ ４Ｄ０５０ Ｃ０２Ｆ 1/28 1/52 Ｋ ４Ｄ０５２ 1/32 1/78 ４Ｄ０６１ 1/34 Ｂ０１Ｄ 53/34 １３４Ｅ 1/44 ＺＡＢ 1/46 １１８Ｂ 1/52 １１８Ｃ 1/78 １１８Ｚ Ｆ２３Ｊ 15/00 23/16 15/04 Ｆ２３Ｊ 15/00 Ｅ Ｚ Ｆターム(参考） 3K070 DA07 DA16 DA24 DA27 DA38 DA46 4D002 AA21 AB01 BA02 BA03 BA04 BA13 BA14 BA16 CA01 CA11 DA02 DA05 DA12 DA16 DA41 EA02 4D006 GA02 KC03 PA01 PB07 4D015 BA04 DA06 DA13 4D024 AA04 AA08 AA10 AB11 BA02 BC01 CA01 4D037 AA15 AB14 AB16 BA18 BA26 4D041 BB04 CB04 4D050 AA13 AB19 BB02 4D052 AA00 BA05 BB07 4D061 DA08 DB19 DC08 EA02 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) B01D 53/34 ZAB C02F 1/34 4D037 53/40 1/44 F 4D041 53/77 1/46 Z 4D050 C02F 1/28 1/52 K 4D052 1/32 1/78 4D061 1/34 B01D 53/34 134E 1/44 ZAB 1/46 118B 1/52 118C 1/78 118Z F23J 15/00 23/16 15/04 F23J 15/00 EZ F term (reference) 3K070 DA07 DA16 DA24 DA27 DA38 DA46 4D002 AA21 AB01 BA02 BA03 BA04 BA13 BA14 BA16 CA01 CA11 DA02 DA05 DA12 DA16 DA41 EA02 4D006 GA02 KC03 PA01 PB07 4D015 BA04 DA06 DA13 4D024 AA11 AA01 AA01 AB10 AB14 AB16 BA18 BA26 4D041 BB04 CB04 4D050 AA13 AB19 BB02 4D052 AA00 BA05 BB07 4D061 DA08 DB19 DC08 EA02
Claims (5)
ス減温塔に導入して冷却し、ついで集塵装置に導入して
排ガス中のばいじんを除去し、続いて湿式洗浄塔に導入
して排ガス中の有害成分を除去する方法において、 前記湿式洗浄塔は少なくとも、薬液を噴霧して排ガス中
の酸性成分を除去する薬液噴霧部と、該噴霧部を経た排
ガスを冷却し該排ガス中のミストを回収して減湿し、減
湿水を循環使用する減湿部とからなり、該減湿部で生じ
る減湿水の少なくとも一部を、前記排ガス減温塔の噴霧
水に用いることを特徴とする排ガス処理方法。1. Exhaust gas containing harmful components is introduced into a water spray type exhaust gas cooling tower, cooled, and then introduced into a dust collector to remove soot and dust from the exhaust gas, and then introduced into a wet washing tower. In the method of removing harmful components in the exhaust gas, the wet cleaning tower at least, a chemical solution spraying section for spraying a chemical solution to remove acidic components in the exhaust gas, and cooling the exhaust gas passing through the spraying section, A mist collecting and dehumidifying part, comprising a dehumidifying part for circulating and using the dehumidifying water, wherein at least a part of the dehumidifying water generated in the dehumidifying part is used as spray water for the exhaust gas degassing tower. Exhaust gas treatment method characterized.
の少なくとも一部をダイオキシン除去装置に導入して減
湿水中のダイオキシンを取り除いたあと、減湿水として
循環使用するか、前記排ガス減温塔の噴霧水に用いるこ
とを特徴とする請求項１記載の排ガス処理方法。2. At least a part of the dehumidified water collected in the dehumidification section of the wet washing tower is introduced into a dioxin removing device to remove dioxin in the dehumidified water, and then the circulated water is used as dehumidified water. The method for treating exhaust gas according to claim 1, wherein the method is used for spray water of the exhaust gas cooling tower.
置、砂ろ過装置、膜ろ過装置、吸着剤充填装置、触媒分
解装置、電気分解装置、紫外線照射装置、マイクロ波照
射装置、オゾン処理装置、から選ばれた少なくとも一つ
の装置であることを特徴とする請求項２記載の排ガス処
理方法。3. The dioxin removal device is selected from a coagulation sedimentation device, a sand filtration device, a membrane filtration device, an adsorbent filling device, a catalytic decomposition device, an electrolysis device, an ultraviolet irradiation device, a microwave irradiation device, and an ozone treatment device. 3. The method for treating exhaust gas according to claim 2, wherein the method is at least one device.
却する水噴霧式の排ガス減温塔と、排ガス中のばいじん
を除去する集塵装置と、薬液を噴霧して排ガス中の酸性
成分を除去する薬液噴霧部および該噴霧部を経た排ガス
を冷却し該排ガス中のミストを回収して減湿し、減湿水
を循環使用する減湿部からなる湿式洗浄塔と、該湿式洗
浄塔の減湿部で循環使用する減湿水の一部を分岐して前
記排ガス減温塔に導入する減湿水供給管、とからなるこ
とを特徴とする排ガス処理装置。4. A water spray type exhaust gas cooling tower for cooling exhaust gas containing at least harmful components, a dust collecting device for removing dust and soot in exhaust gas, and a chemical solution for removing acidic components in exhaust gas. A wet washing tower comprising a chemical spraying section and a flue gas passing through the spraying section, collecting mist in the flue gas to dehumidify, and using a dehumidifying section for circulating and using dehumidified water, and dehumidification of the wet washing tower. A dehumidification water supply pipe for branching a part of the dehumidification water circulated and used in the section and introducing the dehumidification water to the exhaust gas temperature reduction tower.
該減湿水中のダイオキシンを除去するためのダイオキシ
ン除去装置を設置したことを特徴とする請求項４記載の
排ガス処理装置。5. Before introducing the dehumidifying water into the exhaust gas cooling tower,
The exhaust gas treatment device according to claim 4, further comprising a dioxin removal device for removing dioxin in the dehumidified water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001171922A JP2002361043A (en) | 2001-06-07 | 2001-06-07 | Waste gas treatment method and treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001171922A JP2002361043A (en) | 2001-06-07 | 2001-06-07 | Waste gas treatment method and treatment equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002361043A true JP2002361043A (en) | 2002-12-17 |
Family
ID=19013618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001171922A Pending JP2002361043A (en) | 2001-06-07 | 2001-06-07 | Waste gas treatment method and treatment equipment |
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| Country | Link |
|---|---|
| JP (1) | JP2002361043A (en) |
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|---|---|---|---|---|
| JP2006043632A (en) * | 2004-08-06 | 2006-02-16 | Takuma Co Ltd | Method and equipment for treating combustion gas |
| CN102491563A (en) * | 2011-12-22 | 2012-06-13 | 哈尔滨工业大学 | Three-stage catalysis ozone oxidation water purifying device |
| CN105536394A (en) * | 2016-01-29 | 2016-05-04 | 北京神雾环境能源科技集团股份有限公司 | Spray tower, lignite drying flue gas treatment system provided with spray tower and method of lignite drying flue gas treatment system |
| CN106975308A (en) * | 2017-04-24 | 2017-07-25 | 杭州天霁环境科技有限公司 | A kind of dedusting tank |
| JP6241525B1 (en) * | 2016-09-16 | 2017-12-06 | 栗田工業株式会社 | Wastewater recovery method and apparatus for incineration plant adopting wastewater closed system |
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2001
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006043632A (en) * | 2004-08-06 | 2006-02-16 | Takuma Co Ltd | Method and equipment for treating combustion gas |
| CN102491563A (en) * | 2011-12-22 | 2012-06-13 | 哈尔滨工业大学 | Three-stage catalysis ozone oxidation water purifying device |
| CN105536394A (en) * | 2016-01-29 | 2016-05-04 | 北京神雾环境能源科技集团股份有限公司 | Spray tower, lignite drying flue gas treatment system provided with spray tower and method of lignite drying flue gas treatment system |
| JP6241525B1 (en) * | 2016-09-16 | 2017-12-06 | 栗田工業株式会社 | Wastewater recovery method and apparatus for incineration plant adopting wastewater closed system |
| JP2018043218A (en) * | 2016-09-16 | 2018-03-22 | 栗田工業株式会社 | Waste water recovery method and device of incineration plant adopting waste water closed system |
| WO2018051554A1 (en) * | 2016-09-16 | 2018-03-22 | 栗田工業株式会社 | Method and device for recovering waste water from incineration plant |
| CN109641765A (en) * | 2016-09-16 | 2019-04-16 | 栗田工业株式会社 | Burn the draining recovery method and device of complete set of equipments |
| CN106975308A (en) * | 2017-04-24 | 2017-07-25 | 杭州天霁环境科技有限公司 | A kind of dedusting tank |
| CN108905430A (en) * | 2018-07-24 | 2018-11-30 | 王鹏 | A kind of industrial tail gas treatment process |
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