Engine exhaust purification device

Abstract

Abstract Translated from Japanese (57)【要約】 【課題】本発明は、ＨＣ吸着体の再生能力を最大限に活 用して、十分なＨＣ浄化効果が得られるエンジン排気浄 化装置を提供する。 【解決手段】本発明は、ディーゼルエンジン１の排気管 ２の上流側に、同部分から分岐され合流するバイパス路 ３を設け、このバイパス路３にＨＣ吸着体７を介装し、 さらにこのＨＣ吸着体７を昇温させる電気ヒータ８を設 け、排気管２の下流側に、ＨＣを還元剤としてＮＯ X を 還元浄化するＮＯ X 還元触媒９を設けて、ＮＯ X 還元触 媒９の非活性時には、パイパス路３を通じて、ＨＣ吸着 体７で排ガスに含まれるＨＣを吸着させ、ＮＯ X 還元触 媒９の活性時には、電気ヒータ８による昇温でＨＣ吸着 体７からＨＣを脱離させＮＯ X 還元触媒９にて分解させ ることにある。 (57) An object of the present invention is to provide an engine exhaust gas purification apparatus that can make full use of the regeneration capacity of an HC adsorbent to obtain a sufficient HC purification effect. According to the present invention, a bypass passage 3 is provided on the upstream side of an exhaust pipe 2 of a diesel engine 1 so as to be branched from the same portion and join together, and an HC adsorbent 7 is interposed in the bypass passage 3. Further, an electric heater 8 for raising the temperature of the HC adsorbent 7 is provided, and a NO x reduction catalyst 9 for reducing and purifying NO x by using HC as a reducing agent is provided on the downstream side of the exhaust pipe 2 so that the NO x reduction catalyst 9 When inactive, the HC adsorbent 7 adsorbs HC contained in the exhaust gas through the bypass passage 3, and when the NO x reduction catalyst 9 is active, the electric heater 8 raises the temperature to desorb HC from the HC adsorbent 7 and NO This is to decompose with the X reduction catalyst 9.

Inventors

• 👤 Taizo Shimada
• 👤 泰三 嶋田
• 👤 Shigeru Harufuji
• 👤 茂 春藤
• 👤 Takeshi Hashizume
• 👤 剛 橋詰
• 👤 Toshitaka Yokogawa
• 👤 敏隆 横川

Bibliographic Details