What is a SCR filter?
SCR on Filter controls NOx (nitrogen oxides) and PM (particulate matter or soot) emissions from diesel engines, on a single substrate. This technology combines two components into one: DPF (Diesel Particulate Filter) which filters the PM. …
What is SCR cleaning?
SCRs are intended to take in NOx (oxides of nitrogen, usually in the form of atmospheric pollutants) and convert them into their harmless root components (water vapour and nitrogen gas).
What is DPF and SCR?
This is absorbed onto the catalyst, converting NOx in diatomic nitrogen (N2) and water (H2O). A Diesel Particulate Filter reduces the particulate matter emissions from the engine exhaust gases.
What’s inside a SCR?
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid-reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is usually automotive-grade urea, otherwise known as Diesel Exhaust Fluid (DEF).
How much does it cost to clean a DEF system?
Professionally clean approximately $1,500.
How SCR is triggered?
To trigger, or fire, an SCR, voltage must be applied between the gate and cathode, positive to the gate and negative to the cathode. SCRs may be turned off by anode current falling below the holding current value (low-current dropout) or by “reverse-firing” the gate (applying a negative voltage to the gate).
Why are Def containers used in SCR systems?
DEF was developed for diesel engines made in the year 2010 and later, and is used in the selective catalytic reduction systems (SCRs) as an additive to reduce the amount of harmful NOx emissions in the form of particulate matter being released into the atmosphere.
What does SCR stand for in diesel exhaust fluid?
A. SCR is a technology that uses a urea based diesel exhaust fluid (DEF) and a catalytic converter to significantly reduce oxides of nitrogen (NOx) emissions. SCR is the leading technology being used to meet 2010 emission regulations.
When do I need to maintenance my SCR filter?
Typically the SCR filter doesn’t need maintenance except in rare events where a component related to the DEF fluid fails. At the heart of these components is an ultra-fine filter in which to capture microscopic particulates.
How does SCR and Def work for Cummins?
DEF & SCR systems are key to Cummins meeting the 2010 On-Highway emissions requirements. Many other engine manufacturers have selected SCR as their 2010 emission strategy. Consequently, DEF will be an integral part of their solution as well. DEF – SCR Training Module