Common Rail Reagent Injection System

Abstract

An exhaust system includes a selective catalytic reduction (SCR) assembly and an oxidation catalyst assembly. The exhaust system also includes an exhaust fluid injection system for dispersing exhaust fluid into the exhaust flow at a location adjacent to the SCR assembly or the oxidation catalyst assembly, wherein the exhaust fluid injection means includes a common rail that pressurizes The exhaust treatment fluid is provided to a plurality of injectors that dose the exhaust treatment fluid into the exhaust flow. The exhaust fluid injection device also includes a return rail for returning unused exhaust fluid to the fluid source.

Description

technical field [0001] The invention relates to a reagent injection system for an exhaust system. Background technique [0002] This section provides background information that is not necessarily prior art that is not necessarily prior art to the present invention. [0003] Emissions regulations mandate that engines should have exhaust aftertreatment systems to eliminate, or at least substantially minimize, e.g. particulate matter, NO x etc. emissions. To eliminate and reduce particulate matter and NO x For emissions, the exhaust aftertreatment system may include components such as particulate filters (eg, diesel particulate filter (DPF)), selective catalytic reduction (SCR) components, and diesel oxidation catalyst (DOC) components. [0004] SCR and DOC components generally work in conjunction with a reagent injection system that injects reagent into the exhaust gas stream to treat the exhaust before it enters the SCR and DOC components. For SCRs, a reagent solution in...

AI Technical Summary

Problems solved by technology

Therefore, such large-scale applications may be difficult to design to overcome various issues such as maintaining proper injector pressure, system robustness, adequately reducing harmful emissions (e.g., particulate matter and NO x ), cost and maintenance etc.

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