JP2004321841A - Dust removing/deodorizing apparatus and dust removing/deodorizing method - Google Patents

Dust removing/deodorizing apparatus and dust removing/deodorizing method Download PDF

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Publication number
JP2004321841A
JP2004321841A JP2003115661A JP2003115661A JP2004321841A JP 2004321841 A JP2004321841 A JP 2004321841A JP 2003115661 A JP2003115661 A JP 2003115661A JP 2003115661 A JP2003115661 A JP 2003115661A JP 2004321841 A JP2004321841 A JP 2004321841A
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Japan
Prior art keywords
gas
treated
photocatalyst
deodorizing
filter
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JP2003115661A
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Japanese (ja)
Inventor
Kazuhiro Sato
和宏 佐藤
Takaaki Shinoda
高明 篠田
Shizuo Kataoka
静夫 片岡
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Takuma Co Ltd
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Takuma Co Ltd
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Priority to JP2003115661A priority Critical patent/JP2004321841A/en
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  • Filtering Of Dispersed Particles In Gases (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
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  • Filtering Materials (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust removing/deodorizing apparatus capable of performing the treatment of a gas to be treated along with the dust removal/deodorization of the gas to be treated with high treatment efficiency even if a malodorous gas and dust are contained in the gas to be treated while having a merit using photocatalytic action, and a dust removing/deodorizing method using the same. <P>SOLUTION: The dust removing/deodorizing apparatus is equipped with an inflow port 1 for permitting the inflow of the gas to be treated, a filter F for removing dust from the inflow gas to be treated, photocatalyst bodies 4 capable of deodorizing the gas to be treated, light sources 5 for exciting the photocatalyst bodies 4 and a discharge means for discharging the gas treated by the excited photocatalyst bodies 4. The filter F and the photocatalyst bodies 4 are constituted as one set and the light sources 5 are arranged so as to be capable of irradiating the photocatalyst bodies 4 to perform the dust removal and deodorization of the gas to be treated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は除塵脱臭装置と除塵脱臭方法に関し、詳しくは、被処理ガスを流入させる流入口と、流入された被処理ガスを除塵するフィルタと、被処理ガスを脱臭処理可能な光触媒体と、この光触媒体を励起させる光源と、励起された光触媒体により処理されたガスを排出させる排出手段とを備える除塵脱臭装置と、これを用いた除塵脱臭方法に関する。
【0002】
【従来の技術】
下水に含まれる有機化合物などに起因した下水道からの悪臭や、食品工場などの各種工場から発生する臭気ガス、病院などの医療施設、公共施設その他から発生する臭気成分などは、低濃度であるものの発生箇所が多く、発生量も少なくないことから、これら臭気成分に対して効率よく迅速に処理する必要があり、そのための各種方法が提案され、実施されている。
【0003】
例えば、活性炭等の吸着剤を用いて臭気成分を吸着除去する方法、高温下の触媒に通流させて分解処理する触媒処理方法、臭気成分をプラズマにより分解処理するプラズマ処理方法、臭気成分を高温に加熱して燃焼し分解する燃焼処理方法、酸洗浄液やアルカリ洗浄液を用いた薬品により処理する薬品処理方法、酸化チタンのような光触媒を用いて分解処理する光触媒処理方法、オゾンを利用して脱臭するオゾン処理法、微生物を利用する生物処理法などがある。
【0004】
この内、光触媒処理方法は、吸着除去方法のように吸着後の後処理を頻繁に行う必要がなく、触媒処理方法のように高温にする必要がなく、プラズマ処理方法のように水分の影響を少なくするための除湿ヒータを設ける必要がなく、燃焼処理方法のように大掛かりな排ガス装置を設ける必要がなく、薬品処理方法のように中和処理を行う必要がなく、オゾン処理法のように大掛かりな装置を必要とせず、またリークオゾンの処理を必要とせず、生物処理のように処理速度が遅くないなどの利点があるため、開発が進んでいる。
【0005】
例えば、焼却炉の燃焼排ガス排出路に連結されていて、上蓋側と底板側もしくは側壁側で互い違いに連通する複数の区画室をほぼ等間隔に設け、この区画室内に光触媒体を充填させると共に、紫外線放射ランプを内部に装着した紫外線透過性の石英ガラス製筒体などを設けたケーシングからなる排ガス処理設備の発明が提案されている(例えば、特許文献1)。
【0006】
【特許文献1】
特開2001−170453号公報
【発明が解決しようとする課題】
しかしながら、上記従来技術の排ガス処理設備は、焼却炉から排出された排ガスを、光触媒が充填され、入り組んだ複数の区画室を順次通流させるようになっているため、装置自体による圧損が大きく、処理量に限界があり、処理効率は決して高いものではない。しかも、被処理ガス中には一般に塵芥などのダストが含まれているが、従来技術の装置ではそのまま処理され、特に被処理ガス中に粉塵(ダスト)が多い場合には、光触媒の機能が早期に低下し、処理効率が高くならないのみならず、保守作業に多大なコストを要することになるという問題があり、又、別に処理をする場合には設備全体が大掛かりになるという問題がある。
【0007】
そこで、本発明の目的は、上記従来技術の有する問題点に鑑みて、光触媒作用を利用することの利点を有しながら、被処理ガス中に臭気成分の他にダストが含まれている場合であっても、高い処理効率で被処理ガスの除塵と脱臭とを共に処理可能な除塵脱臭装置と除塵脱臭方法を提供することにある。
【0008】
【課題を解決するための手段】
上記目的は各請求項記載の発明により達成される。すなわち、本発明に係る除塵脱臭装置の特徴構成は、被処理ガスを流入させる流入口と、流入された被処理ガスを除塵するフィルタと、被処理ガスを脱臭処理可能な光触媒体と、この光触媒体を励起させる光源と、励起された光触媒体により処理されたガスを排出させる排出手段とを備えていて、前記フィルタと光触媒体とが一組に構成されていると共に、前記光源が前記光触媒体を照射可能に配置されており、前記被処理ガスに対して除塵と脱臭処理とを可能にすることにある。
【0009】
この構成によれば、被処理ガスの除塵と脱臭処理とを略同時に行うことができ、装置内壁などにダストが付着し難くなってメンテナンスが楽になり、高い処理効率で被処理ガスを処理できると共に、処理コストを低減でき、しかも、装置構成全体をコンパクトにでき、設備コストの低下と省スペースを達成できる。
【0010】
その結果、光触媒作用を利用することの利点を有しながら、被処理ガス中に臭気成分とダストとが含まれている場合であっても、高い処理効率で被処理ガスの除塵と脱臭とを共に処理可能な除塵脱臭装置を提供することができた。
【0011】
前記フィルタが、流入される被処理ガスに対向して凸状または凹状に形成されており、前記光触媒体が、前記フィルタの下流側表面に担持されていることが好ましい。
【0012】
この構成によれば、被処理ガスの通過断面積を大きくできるので、被処理ガスが光触媒体内を通過する時間を長くできて(通過速度を遅くできて)、被処理ガス中の臭気成分と光触媒体との接触時間を長くでき、小さいスペース内でも高効率で除塵と脱臭を同時に行える共に、流入させた被処理ガス中のダストが光触媒体により脱臭処理される前に予め除去されるので、光触媒体の脱臭性能を長く維持できる。
【0013】
前記光源が、凸状または凹状に形成された前記フィルタの下流側に配置されていることが好ましい。
【0014】
この構成によれば、光源表面が汚染され難くなって、照射効率を高く維持でき、保守作業を低減できて処理コストを低下できる。
【0015】
前記フィルタが、流入される被処理ガスに対向して凸状または凹状に形成されており、前記光触媒体が、前記フィルタの上流側表面に担持されていてもよい。
【0016】
この構成によれば、被処理ガス中のダストが比較的少ない場合、フィルタの洗浄に、強力なパルスジェット方式、リバースジェット方式を採用し易くなり、メンテナンスが楽になり、処理コストを低減できる。
【0017】
又、本発明に係る除塵脱臭方法の特徴構成は、請求項1〜4のいずれか1の除塵脱臭装置を用いて、被処理ガスを処理することにある。
【0018】
この構成によれば、光触媒作用を利用することの利点を有しながら、被処理ガス中に臭気成分とダストとが含まれている場合であっても、高い処理効率で被処理ガスの除塵と脱臭とを共に処理可能な除塵脱臭方法を提供することができる。
【0019】
【発明の実施の形態】
本発明の実施の形態を、図面を参照して詳細に説明する。図1は、本実施形態に係る除塵脱臭装置の概略断面構造例を示す。この脱臭装置は、被処理ガスを通流させる流入口1と、処理されたガスを強制的に上方から排出する排気ファン(図示略)と排出口2からなる排出手段と、除塵されたダストを排出するダスト排出口3と、を備えたケーシングAを有する。ケーシングA内には、被処理ガスを通流させ被処理ガス中のダストを除去するフィルタの1種であるろ布Fの内面側(下流側)に担持され、流入された被処理ガスを脱臭処理可能な光触媒体4と、この光触媒体4の下流側で光触媒体4を励起させる光源5などとを有する。
【0020】
ろ布Fは、流入される被処理ガスに対向するように多数の断面略U字形をした凸状のバグフィルタからなっていると共に、凸状をした各ろ布Fの内面に光触媒体4が担持され、両者が一体的になって一組のものとして構成されている。各凸状のろ布Fは、その下流側端が隔壁6によって接続されて、これらがケーシングAの断面を横断するように配置されている。このように、ろ布Fは被処理ガスの通過断面積を大きくされているので、被処理ガスが光触媒体4内を通過する時間を長くできて(通過速度を遅くできて)、被処理ガス中の臭気成分と光触媒体との接触時間を長くでき、脱臭処理効率が高くなる。
【0021】
フィルタFとしては、ガラス繊維、PPSやPTFEやナイロン等の合成繊維からなるろ布の他、金属繊維フィルタ、金属焼結体フィルタ、金属メッシュフィルタ、セラミックフィルタ等から構成されていてもよく、光触媒体4に被処理ガス中のダストが付着され難いように除塵可能に形成されている。もっとも、光触媒体4は、フィルタFに担持されて、必ずしも一体的になっている必要はなく、光触媒体4の外周側の全部または一部をフィルタFが被覆するようになって、一組に構成されていてもよい。
【0022】
つまり、光触媒体4は、多孔質な筒状の透明ケース内に充填されて、このケース外周面にろ布を被覆し、ケース内側に光源を配置するようにしてもよい。光触媒体4は、適度なサイズに造粒された光触媒のみからなっていてもよいし、多孔質金属、活性炭、活性アルミナ、シリカゲル、多孔質セラミックス等の各種坦体に光触媒を担持させたものであってもよい。光触媒の造粒は、転動造粒法など一般公知の造粒法を採用でき、特に限定されるものではない。坦体の形状は、粒状、球状、不定形状など種々な形状のものを採用でき、サイズも数十μmから数mm径のものまで採用可能である。
【0023】
光触媒は、励起光の照射により伝導電子と正孔とを生じさせる特性を備えた物質であれば、二酸化チタン以外の化合物であってもよいし、二酸化チタンを主成分として活性炭、グラファイト、シリカ、アルミナ等の吸着剤や、白金、パラジウム、ルテニウム、銀などの酸化作用を促進させる元素が添加されていてもよい。二酸化チタンは、アナターゼ型であることが好ましいが、ルチル型その他の結晶形であってもよい。
【0024】
フィルタFに付着したダストは、振動法、逆圧法、リバースジェット法、パルスジェット法などによって除去することができる。
【0025】
そして、ろ布に担持された筒状の各光触媒体4の内側に、紫外線ランプ等の光源5が配置されている。すなわち、光源5は光触媒体の内側で、被処理ガスが通流する下流側に配置されており、光源5から照射される紫外線(波長300〜345nmが好ましい)により効果的に励起され、光触媒作用を発揮する光触媒に接触しつつ、被処理ガスは脱臭されることになる。このように、光源5は光触媒体4の下流側に配置されているので、その表面が汚染され難く、照射効率を高く維持できる。もっとも、二酸化チタンなどの光触媒自体は耐水性であり、水洗により容易に洗浄可能なので、定期的にあるいは不定期に水洗することにより、高い処理効率を維持できる。
【0026】
光源5としては、紫外線ランプが一般的に用いられ、ブラックライト、蛍光ランプ、殺菌ランプ、紫外線LEDなどを使用できるが、これらに限定されるものではない。光源5の照射強度は、光触媒表面で1〜10mW/cm 程度であることが好ましい。
【0027】
上記実施形態の脱臭装置により処理される被処理ガス中の臭気成分としては、アルデヒド、カルボン酸、硫化水素、メルカプタン、アミン、アンモニア等を挙げることができ、その他、ダイオキシン類やベンゾピレン等の有機ハロゲン化合物、揮発性有機化合物(VOC)、PCBを含んでいても処理可能である。また、被処理ガス中に酸素や水分が含まれていると、光触媒の活性化を高めることができて好ましく、これらを被処理ガスの流路に導入してもよい。
【0028】
【実施例】
(実施例)
市販のバグフィルタ(PPS(ポリフェニレンサルファイド)製のろ布からなる)の内周面に、二酸化チタン粒子を塗布し担持させて、図1に示す構造とした。この装置に対して、臭気成分であるアセトアルデヒド5ppmを含む被処理ガスを、10m /hの流量で通流させた。装置のケーシング内側サイズは、約200(幅)×約180(奥行き)×約200(高さ)程度であり、光触媒体を担持したろ布の高さ(通流方向長さ)は180mmである。光源としては、100Wのブラックライト10本を用いた。ろ布表面での照射強度は、1〜5mW/cm であった。排出口側の臭気成分濃度を検知管により測定すると共に、装置の圧損(初期)を測定した。圧損は、微差圧計を用いて、装置入口と出口の差圧を測定し求めた。その結果、出口側のアセトアルデヒドの濃度は1ppm未満であり、圧損は50mmAqであった。
【0029】
〔別実施の形態〕
(1)除塵脱臭装置を、図2に示すように構成してもよい。すなわち、この除塵脱臭装置は、ケーシングA’の上方より被処理ガスを流入させると共に、ケーシングA’内部の側壁間に差し渡すように複数個の円筒状フィルタF’を配置し、これらフィルタF’の内周面に光触媒体4を担持させてある。そして、光触媒体4の内周面側に、紫外線ランプなどの光源5を挿入してある。上方の流入口1から流入された被処理ガスは、円筒状フィルタF’の内部を通流した後、他端側に設けられた排出口2から排出される。このように構成しても、図1の装置と同様な効果を発揮し得る。フィルタF’に付着したダストは、適宜払い落とされて下方のダスト排出口3から落下され排出される。
【0030】
(2)被処理ガス中にダストが少ない場合には、図3に示すように構成してもよい。すなわち、光源5を光触媒体4の上流側に配置すると共に、被処理ガス中のダストを除去するフィルタFを、光触媒体4の下流側に配置する。このようにすると、圧縮エアーを用いたパルスジェット方式によりフィルタFを洗浄した場合に、光源5にかかる衝撃を緩和して光源5へ損傷を与えることから保護できて都合がよく、更にはリバースジェット方式で洗浄する場合にも、フィルタFを構成するろ布からダストを支障なく容易に払い落とすことができて都合がよい。もとより、パルスジェット方式、リバースジェット方式を行うに当たり、多室構造にする必要がないため、全体構成をコンパクトにでき、かつ通気速度を高めることができて洗浄効率を高めることができる。
【0031】
(3)被処理ガス中にダストが少ない場合には、図1、3に示す一組のフィルタFと光触媒体4の上流側と下流側の双方の位置に光源5を配置して、処理効率を高めるようにしてもよい。その場合、光触媒体4をフィルタFの内外周面の双方に配置させるようにすることが好ましい。
【0032】
(4)被処理ガスとしては常温であることが好ましいが、焼却炉の排ガスのように高温ガスを処理する場合には、光源5を冷却させる空冷ファンを設けたり、水冷したりすると、光源の寿命を長くできることになる。
【0033】
(5)図1、3に示す実施形態では、フィルタFと光触媒体4とを被処理ガスの流入方向に対向して凸状になるように形成した例を示したが、これに代えてフィルタFと光触媒体4とを凹状に形成してもよい。その場合、フィルタFと光触媒体4の配置関係は、被処理ガスの流入方向に対して逆位置に配置される。
【0034】
(6)被処理ガスとしては、臭気成分を含むガスであれば適用するに当たり、特に限定されるものではないが、下水処理施設、下水流通路、食品工場、各種公共施設や劇場などの多人数の集まる施設など、比較的低濃度ではあるが大量の被処理ガスが発生する場所などに使用されると効果が大きい。
【図面の簡単な説明】
【図1】本発明に係る除塵脱臭装置の一例を示す概略断面構成図
【図2】本発明に係る除塵脱臭装置の別実施例を示す概略断面構成図
【図3】本発明に係る除塵脱臭装置の更に別実施例を示す概略断面構成図
【符号の説明】
1 流入口
2 排出口(排出手段)
4 光触媒体
5 光源
F,F’ フィルタ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a dust removing and deodorizing apparatus and a dust removing and deodorizing method, and more specifically, an inflow port through which a gas to be treated is introduced, a filter that removes the introduced gas to be treated, a photocatalyst capable of deodorizing the gas to be treated, The present invention relates to a dust removing and deodorizing apparatus including a light source for exciting a photocatalyst and a discharging unit for discharging gas processed by the excited photocatalyst, and a dust removing and deodorizing method using the same.
[0002]
[Prior art]
Although low-concentration odors from sewage caused by organic compounds contained in sewage, odor gas generated from various factories such as food factories, odor components generated from medical facilities such as hospitals, public facilities, etc. Since there are many generated places and the generated amount is not small, it is necessary to efficiently and quickly treat these odor components, and various methods for that purpose have been proposed and implemented.
[0003]
For example, a method for adsorbing and removing odor components using an adsorbent such as activated carbon, a catalyst treatment method for passing through a high-temperature catalyst to decompose, a plasma treatment method for decomposing odor components with plasma, Combustion treatment method of heating and burning to decompose, chemical treatment method of treating with chemicals using acid cleaning solution or alkali cleaning solution, photocatalyst treatment method of decomposing treatment using photocatalyst such as titanium oxide, deodorization using ozone Ozone treatment method and biological treatment method using microorganisms.
[0004]
Among them, the photocatalyst treatment method does not require frequent post-treatment after adsorption as in the adsorption removal method, does not need to be heated to a high temperature as in the catalyst treatment method, and is not affected by moisture as in the plasma treatment method. There is no need to provide a dehumidifying heater to reduce the amount, and it is not necessary to provide a large exhaust gas device as in the combustion treatment method, and it is not necessary to perform neutralization treatment as in the chemical treatment method, and it is large as in the ozone treatment method. It has advantages that it does not require a simple device, does not require the treatment of leaked ozone, and has a low processing speed unlike biological treatment.
[0005]
For example, a plurality of compartments connected to the flue gas exhaust passage of the incinerator and alternately communicating on the top lid side and the bottom plate side or the side wall side are provided at substantially equal intervals, and the compartments are filled with the photocatalyst, There has been proposed an invention of an exhaust gas treatment facility including a casing provided with an ultraviolet-transmissive quartz glass cylinder or the like in which an ultraviolet radiation lamp is mounted (for example, Patent Document 1).
[0006]
[Patent Document 1]
JP 2001-170453 A [Problems to be Solved by the Invention]
However, the exhaust gas treatment equipment of the above-described conventional technology is configured such that the exhaust gas discharged from the incinerator is filled with a photocatalyst and sequentially flows through a plurality of intricate compartments. The throughput is limited and the processing efficiency is never high. In addition, the gas to be treated generally contains dust such as dust, but is treated as it is in the conventional apparatus, and especially when the gas to be treated is large in dust, the function of the photocatalyst is early. In addition to the above, there is a problem that not only does the processing efficiency not increase, but also that a large amount of cost is required for maintenance work. In addition, there is a problem that if the processing is performed separately, the entire equipment becomes large.
[0007]
Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, while having the advantage of utilizing the photocatalysis, and in the case where the gas to be treated contains dust in addition to odor components. Even if there is, it is an object of the present invention to provide a dust removing and deodorizing apparatus and a dust removing and deodorizing method capable of simultaneously removing dust and deodorizing gas to be treated with high treatment efficiency.
[0008]
[Means for Solving the Problems]
The above object is achieved by the invention described in each claim. That is, the characteristic configuration of the dust removing and deodorizing apparatus according to the present invention includes an inlet for introducing the gas to be treated, a filter for removing the introduced gas to be treated, a photocatalyst capable of deodorizing the gas to be treated, and this photocatalyst. A light source that excites the body, and a discharge unit that discharges the gas processed by the excited photocatalyst, wherein the filter and the photocatalyst are configured as a set, and the light source is the photocatalyst. Is disposed so as to be able to irradiate the gas to be treated, and the gas to be treated can be subjected to dust removal and deodorization treatment.
[0009]
According to this configuration, the dust removal and the deodorization treatment of the gas to be treated can be performed substantially at the same time, the dust is less likely to adhere to the inner wall of the apparatus, maintenance is facilitated, and the gas to be treated can be treated with high treatment efficiency. In addition, the processing cost can be reduced, and the entire apparatus configuration can be made compact, so that the equipment cost can be reduced and the space can be saved.
[0010]
As a result, while having the advantage of utilizing the photocatalysis, even when the gas to be treated contains an odor component and dust, the removal and deodorization of the gas to be treated can be performed with high treatment efficiency. It was possible to provide a deodorizing and deodorizing device that can be processed together.
[0011]
It is preferable that the filter is formed in a convex or concave shape so as to face the gas to be treated to be flowed in, and the photocatalyst is preferably carried on a downstream surface of the filter.
[0012]
According to this configuration, the passage cross section of the gas to be treated can be increased, so that the time for the gas to be treated to pass through the photocatalyst can be lengthened (passing speed can be reduced), and the odor component in the gas to be treated and the photocatalyst can be reduced. The contact time with the body can be extended, dust can be removed and deodorized at the same time with high efficiency even in a small space, and the dust in the gas to be treated is removed before it is deodorized by the photocatalyst. Deodorizing performance of the body can be maintained for a long time.
[0013]
It is preferable that the light source is disposed downstream of the filter formed in a convex or concave shape.
[0014]
According to this configuration, the light source surface is less likely to be contaminated, the irradiation efficiency can be kept high, the maintenance work can be reduced, and the processing cost can be reduced.
[0015]
The filter may be formed in a convex or concave shape so as to face the gas to be processed, and the photocatalyst may be supported on an upstream surface of the filter.
[0016]
According to this configuration, when the amount of dust in the gas to be treated is relatively small, it is easy to employ a powerful pulse jet method or a reverse jet method for cleaning the filter, which facilitates maintenance and reduces processing costs.
[0017]
Further, a characteristic configuration of the dust removing and deodorizing method according to the present invention resides in that a gas to be treated is treated using the dust removing and deodorizing apparatus according to any one of claims 1 to 4.
[0018]
According to this configuration, while having the advantage of utilizing the photocatalytic action, even when the odor component and dust are contained in the gas to be treated, it is possible to remove the dust from the gas to be treated with high treatment efficiency. It is possible to provide a dust removal and deodorization method capable of treating both deodorization and deodorization.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a schematic sectional structure of a dust removing and deodorizing apparatus according to the present embodiment. This deodorizing apparatus includes an inlet 1 through which a gas to be processed flows, an exhaust fan (not shown) for forcibly exhausting the processed gas from above, and an exhausting unit including an exhaust port 2, and a dust removing device. And a casing A having a dust discharge port 3 for discharging. In the casing A, the gas to be treated is carried on the inner surface side (downstream side) of a filter cloth F, which is a kind of filter for removing the dust in the gas to be treated by flowing the gas to be treated, and the inflowing gas to be treated is deodorized. It has a photocatalyst 4 that can be processed and a light source 5 that excites the photocatalyst 4 downstream of the photocatalyst 4.
[0020]
The filter cloth F is composed of a large number of convex bag filters having a substantially U-shaped cross section so as to face the gas to be treated to be flowed in, and the photocatalyst 4 is provided on the inner surface of each convex filter cloth F. It is carried and both are integrally formed as one set. The downstream ends of the convex filter cloths F are connected by the partition walls 6, and are arranged so as to cross the cross section of the casing A. As described above, since the cross-sectional area of the gas to be treated is increased in the filter cloth F, the time for the gas to be treated to pass through the photocatalyst 4 can be increased (the passing speed can be reduced), and the gas to be treated can be reduced. The contact time between the odor component in the inside and the photocatalyst can be lengthened, and the deodorizing treatment efficiency increases.
[0021]
The filter F may be made of a metal fiber filter, a metal sintered filter, a metal mesh filter, a ceramic filter, or the like, in addition to a filter cloth made of glass fiber, synthetic fiber such as PPS, PTFE, or nylon. It is formed so that dust in the gas to be treated hardly adheres to the body 4. However, the photocatalyst 4 is not necessarily required to be integrally supported by the filter F, and the filter F covers the whole or a part of the outer peripheral side of the photocatalyst 4 so as to form a set. It may be configured.
[0022]
That is, the photocatalyst 4 may be filled in a porous cylindrical transparent case, the outer peripheral surface of the case may be covered with a filter cloth, and the light source may be arranged inside the case. The photocatalyst 4 may be composed of only a photocatalyst granulated to an appropriate size, or a photocatalyst supported on various carriers such as porous metal, activated carbon, activated alumina, silica gel, and porous ceramics. There may be. The granulation of the photocatalyst can employ a generally known granulation method such as a tumbling granulation method, and is not particularly limited. As the shape of the carrier, various shapes such as a granular shape, a spherical shape, and an indefinite shape can be adopted, and the size can be adopted from several tens μm to several mm in diameter.
[0023]
The photocatalyst may be a compound other than titanium dioxide as long as it has a property of generating conduction electrons and holes by irradiation with excitation light, or activated carbon, graphite, silica, and titanium dioxide as main components. An adsorbent such as alumina or an element that promotes the oxidizing action such as platinum, palladium, ruthenium, or silver may be added. Titanium dioxide is preferably of the anatase type, but may be of the rutile type or other crystalline forms.
[0024]
Dust adhering to the filter F can be removed by a vibration method, a back pressure method, a reverse jet method, a pulse jet method, or the like.
[0025]
A light source 5 such as an ultraviolet lamp is arranged inside each of the cylindrical photocatalysts 4 supported by the filter cloth. That is, the light source 5 is disposed inside the photocatalyst and on the downstream side through which the gas to be treated flows, and is effectively excited by ultraviolet rays (preferably at a wavelength of 300 to 345 nm) emitted from the light source 5 to perform photocatalysis. The gas to be treated is deodorized while being in contact with the photocatalyst exhibiting the following. As described above, since the light source 5 is disposed on the downstream side of the photocatalyst 4, the surface thereof is not easily contaminated, and the irradiation efficiency can be maintained high. However, since the photocatalyst itself such as titanium dioxide is water-resistant and can be easily washed by washing with water, high treatment efficiency can be maintained by washing with water regularly or irregularly.
[0026]
As the light source 5, an ultraviolet lamp is generally used, and a black light, a fluorescent lamp, a germicidal lamp, an ultraviolet LED, or the like can be used, but is not limited thereto. The irradiation intensity of the light source 5 on the photocatalyst surface is preferably about 1 to 10 mW / cm 2 .
[0027]
Examples of the odor components in the gas to be processed by the deodorizing apparatus of the above embodiment include aldehydes, carboxylic acids, hydrogen sulfides, mercaptans, amines, ammonia and the like, and other organic halogens such as dioxins and benzopyrene. It can be treated even if it contains a compound, a volatile organic compound (VOC), and PCB. In addition, it is preferable that oxygen or moisture is contained in the gas to be treated, because the activation of the photocatalyst can be enhanced, and these may be introduced into the flow path of the gas to be treated.
[0028]
【Example】
(Example)
Titanium dioxide particles were applied and supported on the inner peripheral surface of a commercially available bag filter (made of a filter cloth made of PPS (polyphenylene sulfide)) to obtain the structure shown in FIG. A gas to be treated containing 5 ppm of acetaldehyde, which is an odor component, was passed through this device at a flow rate of 10 m 3 / h. The inside size of the casing of the device is about 200 (width) × about 180 (depth) × about 200 (height), and the height (length in the flowing direction) of the filter cloth supporting the photocatalyst is 180 mm. . As the light source, ten 100 W black lights were used. The irradiation intensity on the filter cloth surface was 1 to 5 mW / cm 2 . The concentration of the odor component on the outlet side was measured with a detector tube, and the pressure loss (initial) of the device was measured. The pressure loss was determined by measuring the differential pressure between the inlet and the outlet of the device using a micro differential pressure gauge. As a result, the concentration of acetaldehyde on the outlet side was less than 1 ppm, and the pressure loss was 50 mmAq.
[0029]
[Another embodiment]
(1) The dust removing and deodorizing device may be configured as shown in FIG. That is, in this dust removing and deodorizing device, the gas to be treated flows in from above the casing A ', and a plurality of cylindrical filters F' are arranged so as to extend between the side walls inside the casing A '. The photocatalyst 4 is carried on the inner peripheral surface of the photocatalyst. A light source 5 such as an ultraviolet lamp is inserted on the inner peripheral surface side of the photocatalyst 4. The gas to be treated which has flowed in from the upper inlet 1 flows through the inside of the cylindrical filter F ', and is then discharged from the outlet 2 provided on the other end side. Even with such a configuration, the same effect as that of the apparatus of FIG. 1 can be exerted. The dust adhering to the filter F 'is appropriately blown off, dropped from the lower dust outlet 3 and discharged.
[0030]
(2) When there is little dust in the gas to be treated, the gas may be configured as shown in FIG. That is, the light source 5 is arranged on the upstream side of the photocatalyst 4, and the filter F for removing dust in the gas to be treated is arranged on the downstream side of the photocatalyst 4. In this way, when the filter F is cleaned by the pulse jet method using the compressed air, the impact applied to the light source 5 can be reduced and the light source 5 can be protected from being damaged. Also in the case of cleaning by a method, dust can be easily removed from the filter cloth constituting the filter F without any trouble, which is convenient. Needless to say, in performing the pulse jet method and the reverse jet method, it is not necessary to use a multi-chamber structure, so that the overall configuration can be made compact, the ventilation speed can be increased, and the cleaning efficiency can be increased.
[0031]
(3) When there is little dust in the gas to be treated, the light source 5 is disposed at both the upstream and downstream positions of the set of filters F and the photocatalyst 4 shown in FIGS. May be increased. In that case, it is preferable to dispose the photocatalyst 4 on both the inner and outer peripheral surfaces of the filter F.
[0032]
(4) The temperature of the gas to be treated is preferably room temperature. However, when a high-temperature gas such as exhaust gas from an incinerator is treated, an air-cooling fan for cooling the light source 5 or water cooling is used. The service life can be extended.
[0033]
(5) In the embodiment shown in FIGS. 1 and 3, the filter F and the photocatalyst 4 are formed so as to be convex in the flow direction of the gas to be treated. F and the photocatalyst 4 may be formed in a concave shape. In this case, the arrangement relationship between the filter F and the photocatalyst body 4 is arranged at a position opposite to the flow direction of the gas to be treated.
[0034]
(6) The gas to be treated is not particularly limited as long as it is a gas containing an odorous component, but is not particularly limited, but may be a multi-person gas such as a sewage treatment facility, a sewage flow passage, a food factory, various public facilities and a theater. It is highly effective when used in places where relatively large concentrations of gas to be treated are generated, although the concentration is relatively low, such as a facility where wastewater gathers.
[Brief description of the drawings]
FIG. 1 is a schematic sectional configuration diagram showing an example of a dust removing and deodorizing device according to the present invention. FIG. 2 is a schematic sectional configuration diagram showing another embodiment of a dust removing and deodorizing device according to the present invention. Schematic sectional configuration diagram showing still another embodiment of the apparatus.
1 inflow 2 discharge outlet (discharge means)
4 Photocatalyst 5 Light source F, F 'filter

Claims (5)

被処理ガスを流入させる流入口と、流入された被処理ガスを除塵するフィルタと、被処理ガスを脱臭処理可能な光触媒体と、この光触媒体を励起させる光源と、励起された光触媒体により処理されたガスを排出させる排出手段とを備える除塵脱臭処理装置において、前記フィルタと光触媒体とが一組に構成されていると共に、前記光源が前記光触媒体を照射可能に配置されており、前記被処理ガスに対して除塵と脱臭処理とを可能にすることを特徴とする除塵脱臭装置。An inlet for introducing the gas to be treated, a filter for removing the introduced gas to be treated, a photocatalyst capable of deodorizing the gas to be treated, a light source for exciting the photocatalyst, and treatment with the excited photocatalyst A filter and a photocatalyst, wherein the filter and the photocatalyst are configured as one set, and the light source is arranged so as to be able to irradiate the photocatalyst, and A dust removing and deodorizing apparatus which enables a dust removal and a deodorization treatment for a processing gas. 前記フィルタが、流入される被処理ガスに対向して凸状または凹状に形成されており、前記光触媒体が、前記フィルタの下流側表面に担持されている請求項1の除塵脱臭装置。2. The deodorizing and deodorizing apparatus according to claim 1, wherein the filter is formed in a convex or concave shape so as to face the gas to be processed, and the photocatalyst is supported on a downstream surface of the filter. 3. 前記光源が、凸状または凹状に形成された前記フィルタの下流側に配置されている請求項1又は2の除塵脱臭装置。The deodorizing and deodorizing device according to claim 1 or 2, wherein the light source is disposed downstream of the convex or concave filter. 前記フィルタが、流入される被処理ガスに対向して凸状または凹状に形成されており、前記光触媒体が、前記フィルタの上流側表面に担持されている請求項1の除塵脱臭装置。2. The deodorizing and deodorizing apparatus according to claim 1, wherein the filter is formed in a convex or concave shape so as to face the gas to be processed, and the photocatalyst is supported on an upstream surface of the filter. 3. 請求項1〜4のいずれか1の除塵脱臭装置を用いて、被処理ガスを処理する除塵脱臭方法。A dust removing and deodorizing method for treating a gas to be treated using the dust removing and deodorizing apparatus according to any one of claims 1 to 4.
JP2003115661A 2003-04-21 2003-04-21 Dust removing/deodorizing apparatus and dust removing/deodorizing method Pending JP2004321841A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014171943A (en) * 2013-03-07 2014-09-22 Nippon Steel & Sumitomo Metal Continuous fixed-bed catalyst reaction apparatus, and catalyst reaction method using the same
JP2018143636A (en) * 2017-03-08 2018-09-20 国立大学法人九州大学 Reaction tube and air purification device
WO2023139800A1 (en) * 2022-01-21 2023-07-27 東洋興商株式会社 Photocatalyst air purification unit and device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014171943A (en) * 2013-03-07 2014-09-22 Nippon Steel & Sumitomo Metal Continuous fixed-bed catalyst reaction apparatus, and catalyst reaction method using the same
JP2018143636A (en) * 2017-03-08 2018-09-20 国立大学法人九州大学 Reaction tube and air purification device
WO2023139800A1 (en) * 2022-01-21 2023-07-27 東洋興商株式会社 Photocatalyst air purification unit and device
JP2023107025A (en) * 2022-01-21 2023-08-02 東洋興商株式会社 Photocatalyst air purification unit and device
JP7473227B2 (en) 2022-01-21 2024-04-23 東洋興商株式会社 Photocatalytic air purification unit and device

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