Ammonia gas generator for producing ammonia in order to reduce nitrogen oxides in exhaust gases

摘要

The present invention relates to an ammonia gas generator for generating ammonia from an ammonia precursor substance and to the use thereof for reducing nitrogen oxides in exhaust, in particular from industrial facilities, from combustion engines, from gas engines, from diesel engines or from petrol engines.

主权项

1. An ammonia gas generator for generating ammonia from a solution of an ammonia precursor substance, comprising:
a catalyst unit, which comprises a catalyst for decomposing and/or hydrolysing ammonia precursor substances into ammonia and a mixing chamber upstream from the catalyst, the catalyst being of a catalyst volume VKat and the mixing chamber being of a mixing chamber volume VMisch, and wherein the catalyst comprises an end face, wherein the mixing chamber is bounded at one end by the catalyst end face; an injection device for introducing the solution of the ammonia precursor substance into the mixing chamber; and an outlet for the ammonia gas which is formed, wherein the injection device comprises at least one nozzle having at least one nozzle opening, wherein the at least one nozzle has a theoretical spray angle α of 10° to 90° and the distance of the at least one nozzle opening from the end face of the catalyst is from 15 to 2000 mm, and the ammonia gas generator comprises at least one thermal insulation layer.