Nissan Diesel Motor Co., Ltd.

Tokyo Roki Co., Ltd.

Tomoko Amemiya

Isamu Kanaya

Daisuke Shirai

Hitoshi Hiramoto

Kiminobu Hirata

Nobuhiko Masaki

Koutarou Honda

Naobumi Yamada

Shinya Obana

Takefumi Mochizuki

An exhaust emission purifying apparatus has a NOx reduction catalytic converter in an exhaust passage of an engine, for purifying nitrogen oxides in the exhaust gas by reduction with urea aqueous solution; an injection nozzle injecting the urea solution toward an exhaust upstream side of the converter in the exhaust passage; and fins disposed on an exhaust upstream side of an injection position of the urea solution in the injection nozzle, for generating a spiral swirling flow of the gas swirling about a center corresponding to the central axis of an exhaust pipe. The swirling flow generated in the exhaust gas prior to the injection-supply of the urea aqueous solution promotes mixing of the solution with the gas to thereby promote the hydrolysis of the urea solution. And the exhaust gas and ammonia generated from the urea solution are uniformly mixed together.

Exhaust emission purifying apparatus for engine

A muffling apparatusof the present invention having an exhaust emission purifying function, including a turning portionin an inside of an exhaust gas flow passage, and having an injection nozzledisposed in an upstream side exhaust gas flow passageof the turning portion, for injection-supplying a liquid reducing agent; and a reduction catalytic converterdisposed in a downstream side exhaust gas flow passageof the turning portion, for reductively purifying nitrogen oxides with the liquid reducing agent. The apparatus further includes a diffusing member, which generates a vortex flow of a gas traveling in a vertical plane of the turning portionto diffuse the liquid reducing agent.

Muffling apparatus having exhaust emission purifying function

Growing community of inventors

Ageo, Japan

Tomoko Amemiya