
A device designed to use exhaust gas discharged out of an engine combustion chamber by dissociating chemical substances contained in the exhaust gas such as CO, CO.sub.2, NOx, HC, etc., in an exhaust gas molecule dissociating tube and drawing components of the exhaust gas, oxygen in particular, again into the engine combustion chamber. The device is so constructed as to collect dust including the carbon component of the exhaust gas in a cyclone drum for removal from the exhaust gas, which allows...











