Cummins has brought out mobile generator units that are the first in the industry to comply with Tier 4 final emissions levels without using a diesel particle filter (DPF).
The units, ranging from 150 kW to 275 kW, will be available from 2014. They are among the first required to comply with the emissions regulations for 175 to 751 HP.
The Tier 4 Final regulations limit mobile generator set emissions to 0.4 grams per kWh of nitrogen oxides (NOx) and 0.02 grams per kWh of particulate matter – soot. This is a 90% reduction on the previous regulations introduced in 2005.
Cummins made improvements to its in-cylinder engine, exhaust gas recirculation and selective catalytic reduction exhaust after treatment.
The efficiency of the in-cylinder combustion engine means no DPF is required.
“By avoiding the need for a DPF, we were able to simplify the after treatment package with benefits of lower maintenance for rental operators. An added advantage to in-cylinder combustion improvement is reduced fuel consumption for end users,” said Santhosh Sorab, marketing manager for Tier4 Final Product Development of Cummins Power Generation.
The first Tier 4 Final generator sets for the rental market from Cummins Power Generation will be the C150D2R generator set, standby rated at 150 kW, and the C200D2R generator set, standby rated at 200 kW. Both units will be available for delivery by Q3 2014. The C275D2R generator set, standby rated at 275 kW, is scheduled to be available beginning in Q4, 2014.
The Tier 4 Final certified mobile generators will feature switchable 60/50Hz dual frequency operation with multiple voltage configurations of 208V, 240V and 480V in three-phase, and 240V in single-phase. The units will also feature the new PowerCommand 3.3 controller (PCC) with both paralleling and advanced master-less load demand capabilities.
The packaged generators will also include a diesel exhaust fluid (DEF) tank and monitoring unit that controls the dispensing of DEF into the SCR to cut emissions of NOx. The normal consumption of DEF is less than 4 percent of fuel consumption, and the DEF reservoir and the fuel tank are sized appropriately to ensure uninterrupted 24-hour runtime.