Selective catalytic reduction exhaust gas after-treatment device, has portion of through-channel through which stream of compressed air is guided at supersonic speed, where housing, made of aluminum alloy or stainless steel, is formed

摘要

The selective catalytic reduction exhaust gas after-treatment device has a portion of a through-channel (5) through which a stream of compressed air is guided at supersonic speed. A urea-water solution is injected in the stream of compressed air with pressure, where the stream of compressed air is slowed down to a sub-sonic speed. An insert piece (29) is provided in a wall (42) made of a temperature-resistant thermoplastic, where a housing (36), made of aluminum alloy or stainless steel, is formed.