JP5301291B2 - 排気ガス後処理系及び排気ガス清浄化方法 - Google Patents
排気ガス後処理系及び排気ガス清浄化方法 Download PDFInfo
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- JP5301291B2 JP5301291B2 JP2008556713A JP2008556713A JP5301291B2 JP 5301291 B2 JP5301291 B2 JP 5301291B2 JP 2008556713 A JP2008556713 A JP 2008556713A JP 2008556713 A JP2008556713 A JP 2008556713A JP 5301291 B2 JP5301291 B2 JP 5301291B2
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- F01N2240/40—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 hydrolysis catalyst
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Description
Claims (21)
- 内燃機関の排気ガスの流れ方向(70)に沿って見て直列に配置されかつ排気ガスがその中を通過する、第1酸化触媒コンバータ装置(20)と、排気ガスの脱窒素用のNOx触媒コンバータ装置(30)と、少なくとも1つの第2酸化触媒コンバータ装置を含む能動的排気ガス温度昇温装置(40)と、粒子除去装置(50)とを有する排気ガス後処理系であって、
前記NOx触媒コンバータ装置(30)と前記粒子除去装置(50)のそれぞれの運転温度を、前記内燃機関の出口側における排気ガスの温度とは独立して設定することができ、
前記NOx触媒コンバータ装置(30)がアンモニアを窒素酸化物の還元剤として使用するSCR触媒コンバータを備え、
窒素酸化物の還元剤の前駆物質を計量し排気ガスに添加する注入ユニット(36)が前記第1酸化触媒コンバータ装置(20)の下流側でかつ前記NOx触媒コンバータ装置(30)の上流側に配置され、
前記能動的排気ガス温度昇温装置(40)が前記第2酸化触媒コンバータ装置の上流側に少なくとも1つの燃料計量注入装置(46)をさらに備え、
前記NOx触媒コンバータ装置(30)の温度制御用として熱量発生ユニット(22)が設けられ、該熱量発生ユニット(22)は、前記注入ユニット(36)による計量の動作が要求され、かつ前記NOx触媒コンバータ装置(30)が規定の温度範囲外にある場合に、作動すると共に、前記燃料計量注入装置(46)による燃料の計量の動作が要求され、かつ前記少なくとも1つの第2酸化触媒コンバータ装置が規定の温度範囲外にある場合に、作動する
ことを特徴とする排気ガス後処理系。 - 前記熱量発生ユニット(22)が、前記NOx触媒コンバータ装置(30)の上流側でかつ前記第1酸化触媒コンバータ装置(20)の下流側に配置されることを特徴とする請求項1に記載の排気ガス後処理系。
- 前記熱量発生ユニット(22)が、前記第1酸化触媒コンバータ装置(20)の上流側に配置されることを特徴とする請求項1に記載の排気ガス後処理系。
- 前記第2酸化触媒コンバータ装置が二流路構成であることを特徴とする請求項1に記載の排気ガス後処理系。
- 前記燃料計量注入装置(46)が、各第2酸化触媒コンバータ装置(42、44)に対して個別に設けられることを特徴とする請求項4に記載の排気ガス後処理系。
- 単一の前記燃料計量注入装置(46)が、前記能動的排気ガス温度昇温装置(40)のすべての前記第2酸化触媒コンバータ装置(42、44)に一緒に燃料供給することを特徴とする請求項4に記載の排気ガス後処理系。
- 前記NOx触媒コンバータ装置(30)が二流路構成であることを特徴とする請求項1〜6のいずれか1項に記載の排気ガス後処理系。
- 前記粒子除去装置(50)が少なくとも1つの粒子フィルタ(52)を有することを特徴とする請求項1〜7のいずれか1項に記載の排気ガス後処理系。
- 前記粒子除去装置(50)が二流路構成であることを特徴とする請求項8に記載の排気ガス後処理系。
- 前記能動的排気ガス温度昇温装置(40)の前記第2酸化触媒コンバータ装置(42、44)が、前記粒子除去装置(50)の中に組み込まれることを特徴とする請求項1〜9のいずれか1項に記載の排気ガス後処理系。
- 第3の酸化触媒コンバータ装置(60)が、前記粒子除去装置(50)の下流側に設けられることを特徴とする請求項1〜10のいずれか1項に記載の排気ガス後処理系。
- 前記第3酸化触媒コンバータ装置(60)が単一流路構成であることを特徴とする請求項11に記載の排気ガス後処理系。
- 前記第3酸化触媒コンバータ装置(60)が二流路構成であることを特徴とする請求項11に記載の排気ガス後処理系。
- 少なくとも1つの温度センサが、前記第1酸化触媒コンバータ装置(20)の上流側、及び/又は、前記熱量発生ユニット(22)の下流側、及び/又は、前記NOx触媒コンバータ装置(30)の上流側、及び/又は、前記NOx触媒コンバータ装置(30)の下流側、及び/又は、前記能動的排気ガス温度昇温装置(40)の上流側、及び/又は、前記粒子除去装置(50)の上流側、及び/又は、前記粒子除去装置(50)の下流側に設けられることを特徴とする請求項1〜13のいずれか1項に記載の排気ガス後処理系。
- アンモニアセンサが前記NOx触媒コンバータ装置(30)の下流側に設けられることを特徴とする請求項1〜14のいずれか1項に記載の排気ガス後処理系。
- NOxセンサが、前記NOx触媒コンバータ装置(30)の下流側及び/又は前記第1酸化触媒コンバータ装置(20)の上流側に設けられることを特徴とする請求項1〜15のいずれか1項に記載の排気ガス後処理系。
- 前記粒子除去装置(50)の上流側及び下流側に、それぞれ1つの圧力センサが配置されることを特徴とする請求項1〜16のいずれか1項に記載の排気ガス後処理系。
- 内燃機関の排気ガスの流れ方向(70)に沿って見て直列に配置された、第1酸化触媒コンバータ装置(20)と、排気ガスの脱窒素用のNOx触媒コンバータ装置(30)と、少なくとも1つの第2酸化触媒コンバータ装置を含む能動的排気ガス温度昇温装置(40)と、粒子除去装置(50)とを有し、前記NOx触媒コンバータ装置(30)がアンモニアを窒素酸化物の還元剤として使用するSCR触媒コンバータを備え、窒素酸化物の還元剤の前駆物質を計量し排気ガスに添加する注入ユニット(36)が前記第1酸化触媒コンバータ装置(20)の下流側でかつ前記NOx触媒コンバータ装置(30)の上流側に配置され、前記能動的排気ガス温度昇温装置(40)が前記第2酸化触媒コンバータ装置の上流側に少なくとも1つの燃料計量注入装置(46)をさらに備え、前記NOx触媒コンバータ装置(30)の温度制御用として熱量発生ユニット(22)が設けられる排気ガス後処理系における排気ガスの浄化方法であって、
前記NOx触媒コンバータ装置(30)と前記粒子除去装置(50)とは、必要に応じて、内燃機関の出口側における排気ガス温度を問わずに運転できるようにされ、
前記NOx触媒コンバータ装置(30)の温度を制御する前記熱量発生ユニット(22)が、前記注入ユニット(36)による計量の動作が要求され、かつ前記NOx触媒コンバータ装置(30)が規定の温度範囲外にある場合に、作動すると共に、前記燃料計量注入装置(46)による燃料の計量の動作が要求され、かつ前記少なくとも1つの第2酸化触媒コンバータ装置が規定の温度範囲外にある場合に、作動することを特徴とする方法。 - 前記燃料計量注入装置(46)による燃料の計量の動作は、前記粒子除去装置(50)の圧力損失の閾値を超える圧力損失がもたらされた場合、及び/又は、前記粒子除去装置(50)のすすによる負荷が許容値を超える場合に実行されることを特徴とする請求項18に記載の方法。
- 前記排気ガス温度昇温装置(40)が作動している時には、前記粒子除去装置(50)の平均温度が、550℃〜850℃であることを特徴とする請求項18あるいは19に記載の方法。
- 前記燃料計量注入装置(46)による燃料の計量の動作は、第2酸化触媒コンバータ装置の温度が、250℃より高い場合に実行されることを特徴とする請求項18〜20のいずれか1項に記載の方法。
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