Patent ID: 7448207
Filing Date: 2008-11-11
Classification: B01F,F01N

Abstract:
1. System for reduction of nitrogen oxides from exhaust gases generated by a lean-bum internal combustion engine, comprising a lean NOx catalyst arranged to be connected to an exhaust conduit of the lean-burn internal combustion engine, an injector arranged for injecting a reduction agent to be used by the lean NOx catalyst in a reduction process, and a fuel tank containing the reduction agent, wherein the fuel tank is a pressure tank adapted to contain di-methyl-ether as a reduction agent and the injector is adapted to inject di-methyl-ether upstream of the lean NOx catalyst, wherein the injector includes a set of injection ports, wherein a distance (d), in a radial direction of a cross section taken along a length axis of an exhaust conduit at a position where the injector is positioned, between the injection ports positioned most distant from each other in the set of injection ports, and an equivalent radius (R) of the lean NOx catalyst fulfil the following relationship: d/R>0.5.