PURPOSE: To achieve reduction of NO2, by a method wherein a combustion chamber is made into airtight structure and a diameter of an exhaust cylinder and a reducing catalyzer is made smaller than that of an external cylinder.
CONSTITUTION: A reducing catalyzer 12 of a transmission metal system is provided within an exhaust gas duct downstream a combustion chamber 10 through an exhaust cylinder 11 having a smaller diameter than that of an external cylinder 9. With this, distributions of oxygen quantity and exhaust gas density passing through a hot air duct 16 is equalized and reduction effect can be improved. The combustion chamber is made into airtight structure allowing no air inflow into it, through which turbulance of combustion gas is prevented from occurring and even combustion is carried out. With this, deterioration of combustibility is prevented, oxidation from NO to NO2 becomes little, reduction efficiency from the NO2 to the NO is improved and reduction of the NO2 is achieved as O2 concentration in combustion exhaust gas which passes through the reducing catalyzer is lowered because no auxiliary gas streams in as bypass air.
MORIYA YOSHIFUMI
NISHIHATA MASAAKI
HARA SHIYOUICHI
ISHIKURA NAOKI
| JPS5424327A | 1979-02-23 | |||
| JPS51129584A | 1976-11-11 |
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