JP2009240973A - 排気ガス処理システムおよび排気ガス処理方法 - Google Patents
排気ガス処理システムおよび排気ガス処理方法 Download PDFInfo
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- FGRVOLIFQGXPCT-UHFFFAOYSA-L dipotassium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [K+].[K+].[O-]S([O-])(=O)=S FGRVOLIFQGXPCT-UHFFFAOYSA-L 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Electrostatic Separation (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Treating Waste Gases (AREA)
Abstract
【解決手段】自動車が走行する地下構築物のための排気ガス処理システム100は、排気ガスが含む浮遊粒子状物質をコロナ放電により除去する電気集塵装置126と、電気集塵装置126が発生したオゾンで排気ガスが含むNOを酸化させ、NOxとして除去する炭素系吸着剤を収容する複数の吸着段を備えるNOx除去装置130と、NOx除去装置130からのNOxが除去された被処理ガスを受領し、排気ガス中のCOを触媒酸化して除去するCO除去装置134とを備え、電気集塵装置126と、NOx除去装置130と、CO除去装置134とは、排気ガスの移動方向に順次配置されている。
【選択図】図1
Description
一方、触媒酸化によるCO除去についても検討されており、例えば、特開2006−122850号公報(特許文献5)では、放電処理を行って触媒反応活性種を生成させて、窒素酸化物および一酸化炭素を除去するガス浄化システムが開示されている。
図7に示すCO除去装置のパイロットシステム700を作成し、CO除去能力の検討を行った。パイロットシステム700は、筐体710と、空気インレットライン720と、被処理ガスのシミュレーションガスであるCO/空気混合ガスを供給するサンプルライン730を備えている。被処理ガスをシミュレーションするシミュレーションガスを、サンプルライン730を介して筐体710内に配置された加湿容器740内導入し、湿度を調節した。筐体710は、恒温槽として構成され、パイロットシステム700のCO除去処理の温度を実施例では、自動車トンネル内の温度環境として可能な、25℃の一定温度とした。
CO/空気のサンプルガスは、CO濃度50ppmの標準ガスを使用した。また、CO/CO2分析装置770として、汎用赤外線分析計(株式会社堀場製作所、型式:VIA−510、CO測定方式NDIR法)を使用した。
CO除去実験には、図8に示す酸化触媒からなるCO除去剤を使用した。なお、図8には、便宜上、CO除去剤として機能する触媒にa〜dの符号を付し、以下、触媒a〜触媒dで各CO除去剤を参照する。使用したCO除去剤は、COをCO2に酸化して除去する市販の酸化触媒であり、それぞれ触媒a(イギリスWGC(World Gold Council)社製、Catalyst Type:Type A 1.5wt%Au/TiO2、Lot No.Au/TiO2♯02−7)、触媒b(ズードケミー触媒株式会社製、品番:N−140)、触媒c(エヌ・イー・ケムキャット株式会社製、品番:DASH)、触媒d(エヌ・イー・ケムキャット株式会社製、品番:NM−101)として市販されているものを使用した。
図9に、CO除去実験に用いた実験条件を示す。また、図9に示した各条件を使用して触媒a〜触媒dについて、サンプルガスを流通させ、CO除去の12時間初期特性を評価した。その結果を図10に示す。触媒aはトンネル内空気の条件下で優れた初期性能を示したが、触媒bは湿度の影響で全く除去できず、触媒cおよび触媒dは湿度の影響が見られた。なお、すべての触媒について、110℃でCO除去性能を測定したところ、全触媒についてCO除去率は、90%以上であった。一方で、図10に示されるように、常温におけるCO除去性能については、触媒の種類に依存して湿度依存性が観測され、触媒aが常湿および高湿環境で良好な特性を示した。
Claims (8)
- 自動車が走行する地下構築物のための排気ガス処理システムであって、前記排気ガス処理システムは、
排気ガスが含む浮遊粒子状物質をコロナ放電により除去する電気集塵装置と、
前記電気集塵装置が発生したオゾンで前記排気ガスが含むNOを酸化させてNO2として除去する炭素系吸着剤を収容する複数の吸着段を備えるNOx除去装置と、
前記NOx除去装置から排出される被処理ガスからCOを触媒酸化して除去するCO除去装置とを備え、
前記電気集塵装置と、前記NOx除去装置と、前記CO除去装置とは、前記排気ガスの移動方向に順次配置される、排気ガス処理システム。 - 前記炭素系吸着剤は、活性炭である、請求項1に記載の排気ガス処理システム。
- 前記CO除去装置は、前記COを低温酸化によりCO2とする、請求項1または2に記載の排気ガス処理システム。
- 前記CO除去装置は、COの酸化触媒を含み、前記酸化触媒は、前記自動車が走行する前記地下構造物内の温度、湿度および圧力範囲で、前記COを前記CO2へと触媒酸化させる、請求項1〜3のいずれか1項に記載の排気ガス処理システム。
- 自動車が走行する地下構築物のための排気ガス処理方法であって、前記排気ガス処理方法は、
電気集塵機により排気ガス中の浮遊粒子状物質を除去すると同時にオゾンを発生させて前記排気ガス中のNOを酸化させてNO2とし、NOx除去装置の炭素系吸着剤により前記NO2を除去して被処理ガスを生成させ、CO除去装置で生成した前記被処理ガス中に残留するCOを低温酸化させることにより、NO2の濃度増加を防止しながら前記COを除去して浄化ガスを生成する、排気ガス処理方法。 - 前記炭素系吸着剤として活性炭を使用し、前記活性炭を再生剤により再生する、請求項5に記載の排気ガス処理方法。
- 前記低温酸化を、前記自動車が走行する前記地下構造物内の温度範囲で行う、請求項5または6に記載の排気ガス処理方法。
- 前記排気ガス中に存在する前記COが環境基準値を超える低換気量で前記排気ガスを処理し、前記環境基準値を超える分の前記COを前記CO除去装置により除去する、請求項5〜7のいずれか1項に記載の排気ガス処理方法。
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