To provide an exhaust treatment device supplying urea as a reducer for reducing NOx discharged from a diesel engine, efficiently supplying heater heat to an urea water spray, vaporizing it and then facilitating hydrolysis, and supplying generated ammonia gas to a denitration catalyst.
For efficiently facilitating gasification of an urea water spray 35 serving as the reducer by using a heat transfer tube 42 utilizing heater 43 heat, and generating the ammonia gas, a plurality of steps of shielding members 60 having a reflecting part 61 and an opening part 62 are disposed in the heat transfer tube 42, and a hydrolysis catalyst 44 is disposed at the downstream. The inner wall surface temperature of the heat transfer tube 42 and the shielding member 60 temperature are set to be not less than film boiling temperature where the urea water spray 35 is vaporized in droplets.
| JP4225017 | Exhaust purification device for internal combustion engine |
| JP3551768 | Internal combustion engine |
| JP6297996 | engine |
NISHIOKA AKIRA
YOKOTA HIROSHI
MURAKAMI TERUHIKO
Yuji Toda
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