EXAHAUST GAS DENITRATION EQUIPMENT FOR RECIPROCATING ENGINE

摘要

The present invention includes: an evaporation chamber (23) that sprays urea water into exhaust gas discharged from an engine (10); a reaction chamber (25) in which exhaust gas containing sprayed urea water is brought into contact with a catalytic unit (28) and is fed into a turbine unit (12T) of a supercharger (12); and a bypass pipe (42) that can be opened or closed so as to directly supply exhaust gas from the engine (10) into the turbine unit (12T) of the supercharger (12). A purge air supply device (51) is provided to spray purge air into the reaction chamber (25) and discharge exhaust gas near the catalytic unit (28) from the reaction chamber (25) when the bypass pipe (42) is opened. This prevents condensation of sulfuric acid from deteriorating denitration catalysts in the reaction chamber (25).