Multi-stage emission system for large displacement compression ignition non-road diesel generator systems for emergency and non-emergency stationary power applications

A multi-stage emissions treatment system for a non-road, medium-speed, large-displacement compression ignition diesel generator, comprising:

• a diesel engine having a per-cylinder displacement between 10 and 30 liters, a rated output between 1,700 kW and 4,700 kW, and an operating speed between 300 and 1,200 revolutions per minute (RPM);
• the engine including an onboard integrated in-cylinder exhaust gas recirculation (EGR) system achieving EPA Tier 4 Certification as an independent and first-stage emissions reduction mechanism;
• a second-stage emissions treatment stage, downstream and in fluid communication with the diesel engine, including a low temperature selective catalytic reduction (SCR) unit, positioned downstream of the EGR system, and configured to inject a reductant to convert nitrogen oxides (NOx) into nitrogen and water vapor or other non-regulated compounds;
• an EPA Tier 4 certified control system wherein the generator is operable in emergency and non-emergency applications, the control system being inducement-resilient whereby a malfunction or failure of the SCR system during non-emergency use does not trigger an engine shutdown, thereby maintaining mission critical availability of the engine;
• wherein the system is configured to achieve emissions levels significantly lower than existing Tier 4 Final emissions requirement of small displacement (<10 L/cyl.), high-speed, engines (0.67 g/kW-h).