Aftertreatment SCR Inlet Cone Swirl Inducer
Publication Date: 2016-Apr-01
The IP.com Prior Art Database
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Title: Aftertreatment SCR Inlet Cone Swirl Inducer
Brief Description of the Drawings: Figure 1 is a perspective view of the inlet opening of a swirl inducer of engine exhaust flow system. Figure 2 is a perspective view of the outlet opening of the swirl inducer of Figure 1. Figure 3 is a perspective view of the swirl inducer of Figure 1 arranged with an upstream fluid opening of a selective catalytic reduction (SCR) catalyst.
Background: This disclosure relates to a mixing system for an exhaust gases after‐treatment arrangement, for example in an exhaust gas pipe. Said system is especially designed to improve the mixing of a fluid with the exhaust gases of a thermal engine. The arrangement of this disclosure can be used for example in an exhaust pipe of a diesel engine wherein an aqueous solution of urea is injected in view of an after‐treatment of the exhaust gases.
Exhaust gases formed in the combustion of fuel in an internal combustion engine may contain a proportion of undesirable substances such as nitrogen oxides (NOx), carbon monoxide (CO), un‐burnt hydrocarbons (HC), soot, etc. To reduce air pollution, vehicles are therefore equipped with various aftertreatment systems that deal with undesirable substances in exhaust gases.
A common exhaust gases after‐treatment system is a so called selective catalytic reduction (SCR) system. Exhaust gases wherein ammonia is added as a reducer is treated in a specific catalytic converter where nitrogen oxides are converted into water and nitrogen which are both non‐toxic substances. Ammonia is introduced in the form of urea in an aqueous solution from which ammonia is obtained through hydrolysis. Urea is usually nebulized in the exhaust gas upstream of the catalytic converter.