Reducing toxic emissions in rental generators

A leader in emissions-reduction and control technologies, Cummins has pioneered a number of in-engine and aftertreatment techniques to meet and exceed the EPA’s Tier 4 emissions-reduction standards. Our mobile generator sets rely on high-pressure fuel injection and diesel oxidation catalyst (DOC) technologies to reduce hydrocarbons (HC) and particulate matter (PM). In addition, we deploy selective catalytic reduction (SCR) technology using diesel emissions fluid (DEF) to address NOx reductions. These technologies combine to achieve the power industry’s most comprehensive Tier 4 compliance methods available in rental generator sets.

High-pressure fuel injection

Our in-cylinder technology injects fuel at extremely high pressures to maximize fuel consumption in the engine itself. This improves fuel efficiencies while simultaneously reducing HC and PM — as well as reducing the generator complexity by eliminating the need for diesel particulate filters (DPF) on aftertreatment systems in all Tier 4 Final generators.

Diesel oxidation catalyst

To further reduce CO, HC and PM, Cummins employs a DOC device in its aftertreatment systems. The DOC oxidation chamber converts toxins to harmless carbon dioxide (CO2) and water, resulting in a 20 percent reduction in PM.

Selective catalytic reduction

To remove the NOx required to comply with Tier 4 regulations, Cummins’ rental generator sets have adapted proven on-road, SCR emissions-reduction technology for mobile applications. The catalyst-coated aftertreatment device reduces NOx to harmless nitrogen and water by injecting a diesel emissions fluid (DEF) into the exhaust stream.

Exhaust gas recirculation

By mixing in controlled amounts of exhaust to reduce oxygen content, the aftertreatment system further reduces NOx emissions.