JP2020513086A - エンジン排気ガスからの有害化合物の除去方法及びシステム - Google Patents
エンジン排気ガスからの有害化合物の除去方法及びシステム Download PDFInfo
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- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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Abstract
Description
2NH3+NO+NO2→2N2+3H2O
によって、低温活性を著しく上昇させることができることは公知である。
酸化触媒を介して、粒子フィルタを介して、及びエンジン排気ガスに添加されたアンモニアの、そのままの形態又はその前駆体の形態のいずれかでの存在下で窒素酸化物を選択的に還元するための触媒を介して、エンジン排気ガスを直列に通すステップと、
窒素酸化物を選択的に還元するための触媒の上流で、二酸化窒素を含有する廃ガスを、エンジン排気ガス中に250℃未満のエンジン排気ガス温度で投入するステップと、
二酸化窒素を含有する廃ガスを提供するステップであって、
アンモニアを酸素含有雰囲気により酸化触媒の存在下で、一酸化窒素及び酸素を含む廃ガスに触媒的に酸化するステップと、
廃ガスを周囲温度まで冷却することと、冷却された廃ガス中の一酸化窒素を二酸化窒素に酸化するステップとによる、提供するステップと、を含む、方法を提供する。
揮発性有機化合物及び一酸化炭素を二酸化炭素及び水に酸化するための、並びに窒素酸化物を二酸化窒素に酸化するための酸化触媒ユニットと、
粒子フィルタと、
窒素酸化物を選択的に還元するための触媒と、
窒素酸化物を選択的に還元するための触媒の上流で、アンモニア又は尿素溶液をエンジン排気ガス流路内に投入するための投入手段と、
窒素酸化物を選択的に還元するための触媒の上流で、二酸化窒素含有廃ガスを投入するための投入手段と、
排気ガス流路の外側に、
アンモニア酸化触媒と、
アンモニア酸化触媒からの一酸化窒素含有廃ガスを冷却及び酸化するための手段であって、その出口端で二酸化窒素含有廃ガスを投入するための投入手段に接続された、手段と、を含む。
Claims (12)
- エンジン排気ガスからの、窒素酸化物、揮発性有機化合物、及び微粒子物質の除去方法であって、
酸化触媒を介して、粒子フィルタを介して、及び前記エンジン排気ガスに添加されたアンモニアの、そのままの形態又はその前駆体の形態のいずれかでの存在下で窒素酸化物を選択的に還元するための触媒を介して、前記エンジン排気ガスを直列に通すステップと、
前記窒素酸化物を選択的に還元するための触媒の上流で、二酸化窒素を含有する廃ガスを、前記エンジン排気ガス中に250℃未満のエンジン排気ガス温度で投入するステップと、
前記二酸化窒素を含有する廃ガスを提供するステップであって、
アンモニア又はその前駆体を酸素含有雰囲気により酸化触媒の存在下で、一酸化窒素及び酸素を含む廃ガスに触媒的に酸化するステップと、
前記廃ガスを周囲温度まで冷却することと、前記冷却された廃ガス中の前記一酸化窒素を二酸化窒素に酸化するステップとによる、提供するステップと、
を含む、方法。 - 前記酸素含有雰囲気が、エンジン排気ガスを含む、請求項1に記載の方法。
- 前記酸素雰囲気が、周囲の空気である、請求項1に記載の方法。
- 二酸化窒素を含有する廃ガスを、前記粒子フィルタの上流で投入する、請求項1〜3のいずれか一項に記載の方法。
- 前記二酸化窒素を含有する廃ガスを、前記エンジン排気ガス中に投入して、前記窒素酸化物を選択的に還元するための触媒への入口で、前記窒素酸化物の45〜55体積%の量を二酸化窒素とする、請求項1〜4のいずれか一項に記載の方法。
- 前記冷却された廃ガス中の前記一酸化窒素の二酸化窒素への酸化を、酸化触媒の存在下で行う、請求項1〜5のいずれか一項に記載の方法。
- 前記粒子フィルタを、煤を燃焼し尽くすのに活性な触媒で触媒する、請求項1〜6のいずれか一項に記載の方法。
- 請求項1〜7のいずれか一項に記載の方法に使用するためのシステムであって、エンジン排気ガス流路内に直列に、
揮発性有機化合物及び一酸化炭素を二酸化炭素及び水に酸化するための、並びに窒素酸化物を二酸化窒素に酸化するための酸化触媒ユニットと、
粒子フィルタと、
窒素酸化物を選択的に還元するための触媒と、
前記窒素酸化物を選択的に還元するための触媒の上流で、アンモニア又は尿素溶液を前記エンジン排気ガス流路内に投入するための投入手段と、
前記窒素酸化物を選択的に還元するための触媒の上流で、二酸化窒素含有廃ガスを投入するための投入手段と、
前記排気ガス流路の外側に、
アンモニア酸化触媒と、
前記アンモニア酸化触媒からの一酸化窒素含有廃ガスを冷却及び酸化するための手段であって、その出口端で前記二酸化窒素含有廃ガスを投入するための投入手段に接続された、手段と、
を含む、システム。 - 前記二酸化窒素含有廃ガスを投入するための投入手段が、前記粒子フィルタの上流に配置されている、請求項8に記載のシステム。
- 前記一酸化窒素含有廃ガスを冷却及び酸化するための手段が、渦巻状に巻かれた管の形態である、請求項8又は9に記載のシステム。
- 前記一酸化窒素含有廃ガスを冷却及び酸化するための手段に、酸化触媒が提供されている、請求項8〜10のいずれか一項に記載のシステム。
- 前記粒子フィルタが、煤を燃焼し尽くすのに活性な触媒で触媒されている、請求項8〜11のいずれか一項に記載のシステム。
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