Patent ID: 8899026

Claim:
An arrangement for introducing a liquid medium into exhaust gases from a combustion engine, comprising: a mixing duct arranged to have exhaust gases flowing through it; an injector for injecting the liquid medium into the mixing duct centrally at an upstream end of the mixing duct; an inlet duct which is situated upstream of the mixing duct, has at an upstream end thereof an inlet for receiving the exhaust gases and at a downstream end thereof an outlet for conducting the exhaust gases to the upstream end of the mixing duct in order to deliver the exhaust gases to the mixing duct; the inlet duct having a first duct section which is annular in cross-section and has at its downstream end an annular outlet; the inlet duct having a second duct section which is annular in cross-section, is situated downstream of the first duct section and surrounds the mixing duct, the second duct section being connected via its downstream end to the outlet of the inlet duct and having at its upstream end an annular inlet; said first duct section surrounding said second duct section; and the inlet duct further comprising a flow reversal section via which the annular outlet of the first duct section is connected to the annular inlet of the second duct section and which is configured and arranged to reverse the direction of flow of the exhaust gases flowing through the inlet duct so that said exhaust gases are caused to flow through the second duct section in a direction opposite to that of the exhaust gases in the first duct section.