JP6205153B2 - 排ガス浄化システムにおける脱硝触媒のオンサイト再生方法 - Google Patents
排ガス浄化システムにおける脱硝触媒のオンサイト再生方法 Download PDFInfo
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- JP6205153B2 JP6205153B2 JP2013072242A JP2013072242A JP6205153B2 JP 6205153 B2 JP6205153 B2 JP 6205153B2 JP 2013072242 A JP2013072242 A JP 2013072242A JP 2013072242 A JP2013072242 A JP 2013072242A JP 6205153 B2 JP6205153 B2 JP 6205153B2
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Description
図1のフローシートに示す装置を用いて、本発明による排ガス浄化システムにおける脱硝触媒のオンサイト再生方法を実施し、脱硝触媒の再生を定期的に行ったときの脱硝率の変化を測定した。
脱硝触媒層(1)の触媒再生時に、還元剤供給主ライン(13)のバルブ(22)を閉じ、還元剤供給分岐ライン(17)のバルブ(25)を開けて、エタノールよりなる還元剤の供給を還元剤供給主ライン(13)から還元剤供給分岐ライン(17)に切り換えるとともに、空気供給主ライン(14)のバルブ(24)を閉じ、空気供給分岐ライン(18)のバルブ(26)を開けて、空気の供給を空気供給主ライン(14)から空気供給分岐ライン(18)に切り換え、前記脱硝触媒層(1)の下流側の排気ライン(12)に設置した熱交換器(3)において浄化排ガスの排熱で空気供給分岐ライン(18)内を通る空気を加温し、この加温空気と還元剤を、合流ライン(19)で合流させて還元剤酸化触媒層(2)に供給した。
上記実施例1の場合と同様にして、本発明による排ガス浄化システムにおける脱硝触媒のオンサイト再生方法を実施するが、上記実施例1の場合と異なる点は、脱硝触媒再生時の脱硝触媒層(1)の加熱処理温度(℃)および/または加熱処理時間(h)を変更した点にある。
図1のフローシートに示す装置を用いて、上記実施例1の場合と同様に排ガス浄化システムを稼動させるが、脱硝触媒層(1)の触媒の性能が低下してきた際にも触媒再生処理を実施することなく、そのまま排ガスの脱硝による浄化を100時間継続して実施した後、排ガスの脱硝率を測定し、得られた脱硝率の結果、およびこの時の脱硝率の対新品比を、下記の表2にあわせて示した。
図2のフローシートに示す装置を用いて、本発明による排ガス浄化システムにおける脱硝触媒のオンサイト再生方法を実施し、脱硝触媒の再生を定期的に行ったときの脱硝率の変化を測定した。
2:還元剤酸化触媒層
3:空気加熱用熱交換器
11:内燃機関の排気ライン(排気通路)
12:排出ライン
13:還元剤供給主ライン
14:空気供給主ライン
15:合流ライン
16:ノズル
17:分岐ライン
18:空気供給分岐ライン
19:合流ライン
20:ライン
21〜27:バルブ
31:別の還元剤供給副ライン
32:バルブ
33:空気供給副ライン
34:バルブ
Claims (4)
- 内燃機関の排気通路に設置した脱硝触媒層の上流側の排ガスに還元剤同伴空気を添加し、脱硝触媒層において排ガス中の窒素酸化物を還元して、排ガスを浄化する排ガス浄化システムにおいて、
還元剤酸化触媒層を併設し、
還元剤を前記脱硝触媒層の上流側の排ガスに供給する還元剤供給主ラインの途上に還元剤供給分岐ラインを設け、一方、空気を前記脱硝触媒層の上流側の排ガスに供給する空気供給主ラインの途上に空気供給分岐ラインを設けるとともに、これらの還元剤供給分岐ラインおよび空気供給分岐ラインを前記還元剤酸化触媒層に接続しておき、
前記脱硝触媒層の触媒再生時に、還元剤の供給を還元剤供給主ラインから還元剤供給分岐ラインに切り換えるとともに、空気の供給を空気供給主ラインから空気供給分岐ラインに切り換えて、前記還元剤酸化触媒層に還元剤および空気を供給し、
この還元剤酸化触媒層において還元剤と空気による酸化反応で発生した反応熱により高温の酸化反応ガスを生じさせ、この高温の酸化反応ガスを前記脱硝触媒層に導入して脱硝触媒を加熱することにより、脱硝触媒を再生することを特徴とする、排ガス浄化システムにおける脱硝触媒のオンサイト再生方法。 - 内燃機関の排気通路に設置した脱硝触媒層の上流側の排ガスに還元剤同伴空気を添加し、脱硝触媒層において排ガス中の窒素酸化物を還元して、排ガスを浄化する排ガス浄化システムにおいて、
還元剤酸化触媒層を併設し、
前記還元剤酸化触媒層に、前記脱硝触媒層の上流側の排ガスに供給する還元剤と同種の還元剤または別種の還元剤を供給する還元剤供給副ラインを接続し、一方、空気を前記脱硝触媒層の上流側の排ガスに供給する空気供給主ラインの途上に空気供給分岐ラインを設けて、この空気供給分岐ラインを前記還元剤酸化触媒層に接続しておき、
前記脱硝触媒層の触媒再生時に、前記還元剤酸化触媒層に還元剤供給副ラインから同種の還元剤または別種の還元剤を供給するとともに、空気の供給を空気供給主ラインから空気供給分岐ラインに切り換えて、前記還元剤酸化触媒層に空気を供給し、
この還元剤酸化触媒層において還元剤と空気による酸化反応で発生した反応熱により高温の酸化反応ガスを生じさせ、この高温の酸化反応ガスを前記脱硝触媒層に導入して脱硝触媒を加熱することにより、脱硝触媒を再生することを特徴とする、排ガス浄化システムにおける脱硝触媒のオンサイト再生方法。 - 内燃機関の排気通路に設置した脱硝触媒層の上流側の排ガスに還元剤同伴空気を添加し、脱硝触媒層において排ガス中の窒素酸化物を還元して、排ガスを浄化する排ガス浄化システムにおいて、
還元剤酸化触媒層を併設し、
前記還元剤酸化触媒層に、前記脱硝触媒層の上流側の排ガスに供給する還元剤と同種の還元剤または別種の還元剤を供給する還元剤供給副ライン、および前記還元剤酸化触媒層に空気を供給する空気供給副ラインを、前記脱硝触媒層の上流側の排ガスに還元剤を供給する還元剤供給主ラインおよび空気を供給する空気供給主ラインとはそれぞれ別に設けておき、
前記脱硝触媒層の触媒再生時に、前記還元剤酸化触媒層に還元剤供給副ラインから同種の還元剤または別種の還元剤を供給するとともに、空気供給副ラインから空気を供給し、
この還元剤酸化触媒層において還元剤と空気による酸化反応で発生した反応熱により高温の酸化反応ガスを生じさせ、この高温の酸化反応ガスを前記脱硝触媒層に導入して脱硝触媒を加熱することにより、脱硝触媒を再生することを特徴とする、排ガス浄化システムにおける脱硝触媒のオンサイト再生方法。 - 脱硝触媒層の下流側の排気通路に空気加熱用熱交換器を設置し、該熱交換器において脱硝触媒層から排出された浄化排ガスの排熱で空気を加温し、この加温空気を前記還元剤酸化触媒層に供給して、還元剤と空気による酸化反応を起こすことを特徴とする、請求項1〜3のうちのいずれか一項に記載の排ガス浄化システムにおける脱硝触媒のオンサイト再生方法。
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