What is SCR?
If you are looking for a NOx reduction solution, SCR may be a suitable option. SCR is the catalysed chemical reaction that reduces NOx to water and nitrogen.
The process uses diesel exhaust fluid (DEF) as the reductant. DEF is injected into a tube where it mixes with the exhaust. The reactions take place as the DEF/exhaust mixture passes through the SCR catalyst.
Special considerations for using SCR
One unique aspect of an engine with an SCR system is that operators need to top-up the DEF on a periodic basis.
DEF consumption rates are determined by vehicle operation. For most light-duty vehicles, DEF refill intervals typically occur around the time of a recommended oil change or other scheduled vehicle maintenance.
DEF replenishment for heavy-duty vehicles and off-road machines and equipment will vary depending on the operating conditions.
What are the strengths of SCR?
- It’s a highly effective system for reducing NOx and is the primary technology within the industry to meet Stage IV/Tier 4 Final emission standards for the power band of 56-560 kW/75-750 hp engines
- SCR requires a second fluid – the DEF – and Perkins has developed systems to limit the amount of DEF consumption required in overall engine optimisation.
We’ve been on an exciting journey of innovation and dynamic product development as emission standards have become more stringent over the years.
Our solutions provide OEMs with improved performance and fuel efficiency, dependable power and a lifetime of low costs for the operator.
Engine optimisation and integration
Collaboration with our customers is the cornerstone of Perkins engine design – and it’s the reason we’re a leader in diesel engine development.
Fuel quality - alternative fuels
Fuel quality around the world can vary markedly and this can affect both the short-term performance of your engine, and potentially its long-term future.