Förfarande för minskning av kväveoxider (NOX) vid en överladdad kolvmotor

摘要

A method of reducing nitrogen oxide (NOx) emissions in a supercharged piston engine (1) comprising increasing the pressure of intake air by means of a supercharger (2) and feeding water (4,4',8) into the compressed intake air before leading the intake air to the engine so as to increase the humidity of the intake air. The temperature of the intake air supplied to the engine is controlled by a control arrangement controlling the operation of a heat exchanger (5,5') and/or the injection of water into the intake air based on the measurement of conditions of the intake air. The invention also relates to an arrangement for reducing nitrogen oxide (NOx) emissions of a supercharged piston engine (1).