Exhaust Aftertreatment Case Studies & Retrofits | SHUOCHUN

We deliver full-cycle professional technical consultation and all-round overseas support for global partners engaged in diesel generator and marine vessel emission renovation.

Our engineering team provides one-on-one customized solution calculation based on engine power ranging from 50kW to 10,000kW, assisting you in selecting matched DOC, DPF and SCR integrated systems to fully satisfy local emission regulations such as EPA Tier 4, EU Stage V and IMO Tier III.

We support factory inspection arrangement, remote parameter debugging, installation drawing provision and on-site technical docking worldwide. Whether you are equipment manufacturers, distributors or engineering integrators, we offer long-term fault troubleshooting, regeneration parameter optimization and regulatory certification guidance to eliminate your technical barriers in emission control projects.

Reach out via WhatsApp for instant technical consultation at any time.

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Diesel oxidation catalyst DOC cross-section showing exhaust flow and reaction zones

DOC

Diesel Oxidation Catalyst（DOC）： It is a structure coated with an oxidized noble metal catalyst coating on the surface of a honeycomb shaped ceramic carrier. It can oxidize most of the carbon monoxide (CO), hydrocarbons (CH), and most of the soluble organic matter (SOF) in particulate matter (PM) in tail gas. The conversion efficiency of DOC for CH and CO is about 80% -90%, and the reaction efficiency for SOF is about 30%. And the oxidation reaction process will generate a large amount of heat, providing the required reaction temperature for SCR reaction or passive regeneration of CDPF.

Diesel particulate filter DPF diagram showing exhaust flow through cordierite ceramic filter

DPF

Diesel Particulate Filter （DPF）： It is currently considered the most effective and technologically mature device for reducing PM emissions. DPF utilizes inertial collision, interception, diffusion, and gravity settling mechanisms to filter PM out of exhaust gas. The capture efficiency of DPF for PM in exhaust gas can reach about 95%.

SCR system diagram showing urea injection, mixer and catalyst module for NOx reduction

SCR

Selective Catalytic Reduction Agent (SCR): SCR is a structure coated with a selective reduction catalyst coating on the surface of a honeycomb shaped ceramic carrier. The reducing agent (NH3) sprayed by the device system reacts rapidly with nitrogen oxides (NOX) in the exhaust gas under the action of catalyst coating, thereby reducing NOX emissions in the exhaust gas. The conversion efficiency of SCR to NOX can reach over 90%.