Aftertreatment System Design

Modern-ultra low emission targets have been met in part through the adoption of advanced exhaust gas aftertreatment processing.

1D aftertreatment system simulations

1D Aftertreatment System Simulations

Aftertreatment technologies can be catalysts such as a Diesel Oxidation Catalyst (DOC) which are employed to oxidize any unburned hydrocarbons by promoting heat and facilitating the oxidation reaction, a catalyst with a working fluid such as the Selective Catalytic Reduction Catalyst (SCR) which, with the injection of urea, is used to convert NOx to water and inert nitrogen, or a scrubber such as a Diesel Particulate Filter (DPF) which is used to trap and then periodically burn off excess soot. These and equivalent technologies can facilitate the reduction of unwanted nitric oxides, carbon monoxides, sulphur oxides, unburned hydrocarbons soot, ash, carbon dioxide and others.

The efficiency and operating strategy associated with the integration of these technologies into an aftertreatment system is highly sensitive to the state of the working fluid for each sub-component. This makes the integration of these technologies, a multi-dimensional optimisation challenge which can be facilitated through simulation of the aftertreatment system.

CMCL Innovations have developed advanced combustion and aftertreatment software simulation tools which are “well validated” and “physics-based”, this enables our customers to optimise their engine and aftertreatment operating strategy more robustly and with greater physical insight into the challenge.

Using CMCL plug-in: PM size distribution as a function of catalyst temperature

PM size distribution as a function of catalyst temperature

Typical Projects

  • Simultaneous optimisation of combustion and aftertreatment strategies i.e. an integrated solution
  • Advanced control strategies
  • Advanced chemical models for aftertreatment components
  • De-NOx catalyst, DOC, DPF simulations
  • Soot particle size and morphology computations
  • Model parameter studies
  • Bespoke research

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