Patent ID: 8621850

Claim:
An exhaust gas treatment device of a diesel engine, the device comprising: a combustible gas generator ( 1 ) for generating a combustible gas ( 4 ), a combustible gas discharge port ( 6 ) connected to the combustible gas generator ( 1 ) for discharging the combustible gas ( 4 ) to an exhaust passage ( 7 ) upstream of a DPF ( 5 ), the combustible gas ( 4 ) being burnt by oxygen within an exhaust gas ( 8 ), a temperature of the exhaust gas ( 8 ) being raised by heat of the combustion, and a PM accumulated in the DPF ( 5 ) being burnt and removed by heat of the exhaust gas ( 8 ), a combustible gas generation catalyst chamber ( 11 ) installed in the combustible gas generator ( 1 ), a combustible gas generation catalyst ( 13 ) accommodated in the combustible gas generation catalyst chamber ( 11 ), a ring-shaped wall ( 14 ) disposed in a starting end portion of the combustible gas generation catalyst chamber ( 11 ), an air-fuel mixing chamber ( 12 ) formed on an inside of the ring-shaped wall ( 14 ), wherein air ( 3 ) and liquid fuel ( 2 ) are supplied to the air-fuel mixing chamber ( 12 ) so that an air-fuel mixture gas ( 23 ) is formed in the air-fuel mixing chamber ( 12 ), the air-fuel mixture gas ( 23 ) is supplied to the combustible gas generation catalyst ( 13 ), and the combustible gas ( 4 ) is generated by using the combustible gas generation catalyst ( 13 ), a core material ( 15 ) inwardly inserted into a center portion of the ring-shaped wall ( 14 ) so that the air-fuel mixing chamber ( 12 ) is formed between an inner peripheral surface ( 16 ) of the ring-shaped wall ( 14 ) and an outer peripheral surface ( 18 ) of the core material ( 15 ), and the air-fuel mixture gas ( 23 ) of the air-fuel mixing chamber ( 12 ) is supplied from a terminal end portion of the air-fuel mixing chamber ( 12 ) to a portion near a center portion of the combustible gas generation catalyst ( 13 ), and a heat-dissipating outer peripheral surface ( 26 ) of a heater ( 25 ) being exposed to the air-fuel mixing chamber ( 12 ) by using the heater ( 25 ) as the core material ( 15 ), and when the combustible gas ( 4 ) starts being generated, heat is directly radiated from the heat-dissipating outer peripheral surface ( 26 ) of the heater ( 25 ) to the air-fuel mixing chamber ( 12 ).