EXHAUST-GAS DENITRATION SYSTEM SHIP EQUIPPED THEREWITH AND METHOD FOR CONTROLLING EXHAUST-GAS DENITRATION SYSTEM

摘要

To prevent clogging of the urea water injection nozzle and the exhaust pipe, and to avoid poisoning of the exhaust gas denitration catalyst. An exhaust turbo supercharger 5 driven by the exhaust gas of the marine diesel engine 3, a reactor 2 for generating ammonia from urea water and a urea water injection nozzle 32 for supplying urea water into the reactor 2 An SCR catalytic unit 4 installed in an exhaust gas passage on the downstream side of the exhaust turbo supercharger 5 for performing denitration of exhaust gas using ammonia supplied from the reactor 2, An exhaust gas bypass path B1 for introducing an exhaust gas added to a part of the exhaust gas supplied to the exhaust turbo supercharger 5 to the reactor 2 and a burner 50 for heating the exhaust gas in the reactor 2, .