DENITRATION METHOD FOR EXHAUST OF INTERNAL COMBUSTION ENGINE

摘要

PURPOSE:To prevent the exhaust of NOx by mixing ammonia and/or its precursor respectively in the gas inside a cylinder just before opening an exhaust valve or into an exhaust gas just after opening the exhaust valve and resolving a nitrogen oxide inside the exhaust. CONSTITUTION:The ammonia injection valve 8 injecting ammonia into a cylinder 2 is provided on a cylinder head 3 in case of applying for a large sized low speed two cycle diesel engine. A crank angle is then detected by a crank angle sensor 12 so as to open an ammonia injection valve 8 prior to opening (5-10 deg.CA) an exhaust valve 5, the ammonia injection valve 8 is opened by an opening controller 11 based on the detected crank angle and the ammonia of after being subjected to pressure rising by the pump 9 connected to a bomb 10 is made to inject into a combustion chamber. The nitrogen oxide of a high temp. gas inside is resolved with the existence of oxygen to realize pollution free.