Process and installation for purification of exhaust gases from internal combustion engines

摘要

The process enables the removal of gaseous contaminants from the exhaust gases of thermal engines, particularly diesel locomotives operating in confined spaces. The process comprises the following stages: re-heating of the exhaust gases to a temperature of 300 - 450 degrees C., preferably 350 - 360 degrees C.; treatment of the oxides of carbon and hydrocarbons by catalytic oxidation; addition of a reactant such as urea or ammonia; treatment of oxides of nitrogen by catalytic reduction; cooling of the gaseous flow; treatment of the sulfur oxides by mixing with water in a venturi-effect washer; and bubbling of the residual gases through water. The addition of a reactant is regulated as a function of the nitrogen oxide content in the exhaust gases. An Independent claim is also included for the installation for the process.