EXHAUST EMISSION CONTROL METHOD AND EXHAUST EMISSION CONTROL SYSTEM FOR RECIPROCATING INTERNAL COMBUSTION ENGINE

摘要

PPROBLEM TO BE SOLVED: To remove NOSBx/SBin exhaust gas by suppressing the transient characteristic deterioration of a reciprocating internal combustion engine when the NOSBx/SBin the exhaust gas from the reciprocating internal combustion engine provided with a supercharger is removed by an SCR system. PSOLUTION: In a reciprocating marine diesel engine 10 with the supercharger 30 disposed in exhaust pipes 38, 44, 48, a urea aqueous solution supply section 42 is provided in the exhaust pipe 38 upstream of a turbine 34, and a urea aqueous solution b is supplied from a urea aqueous solution tank 40. The urea aqueous solution b is evaporated by potential heat of exhaust gas, and hydrolyzed into ammonia gas. The ammonia gas is uniformly agitated and mixed with the exhaust gas in the strong turbulence field of the turbine 34. After that, regarding the exhaust gas, the NOSBx/SBin the exhaust gas is reduced by the ammonia gas through an SCR catalytic converter 46 disposed in the exhaust pipe 44 downstream of the supercharger 30, and converted into nitrogen and steam. Since the urea aqueous solution b is supplied to the exhaust pipe 38 upstream of the turbine 34, it is possible to generate the ammonia gas without providing an additional heating installation such as a stabilizing burner. PCOPYRIGHT: (C)2011,JPO&INPIT