What is SCR aftertreatment?
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What is SCR aftertreatment?
The Selective Catalytic Reduction (SCR) system is an advanced exhaust after treatment system to reduce NOx. The engine controls the production of PM by increasing the combustion temperature thus limiting it within the permissible value.
What does SCR stand for on a diesel engine?
Selective Catalytic Reduction (SCR) is a proven and 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).
What does the SCR catalyst do?
Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that reduces tailpipe emissions of nitrogen oxides (NOx) down to near-zero levels in newer generation diesel-powered vehicles and equipment.
How does Cummins aftertreatment work?
The exhaust progresses from the Decomposition Reactor into the SCR system which converts the toxic NOx and urea mixture into harmless nitrogen gas (N2) and water vapor (H2O), which effectively eliminates harmful emissions resulting in near zero emissions from the exhaust.
What causes SCR failure?
Temperature/Overheating Inadequate cooling of semiconductors such as SCR and Diodes can and will cause devices to fail prematurely, some in a matter of minutes depending on the amount of current being carried. If you are experiencing recurring device failure it may be caused by a lack of cooling.
How much does an SCR cost?
Most surveyed utilities spent between $100 and $200/kW for a selective catalytic reduction system.
Can you clean a diesel SCR?
As an owner/driver of a Diesel-powered vehicle you need to clean the SCR regularly as this will save you money in operating costs and prevent costly downtime in the long run. Maintenance schedules or cleaning cycles vary according to the type of vehicle and how your vehicle is being used.
What does SCR warning light mean?
Selective Catalytic Reduction
Selective Catalytic Reduction (SCR) System (Some Models) If the AdBlue ® fluid completely runs out, the SCR system will not operate normally. When the remaining AdBlue ® is low, a message is displayed on the multi-information display, and the SCR warning light turns on/flashes.
What does aftertreatment control module?
The Aftertreatment Control Module cleans the diesel exhaust created by the engine before it is released into the air through the tailpipe to reduce the number of pollutants that enter the environment.
What is diesel aftertreatment?
What is an aftertreatment system? It is a series of components that cleans the diesel exhaust emitted by the engine prior to releasing it through the tailpipe to the outside air. Its purpose is to reduce the emission of harmful pollutants into the environment.
How do you troubleshoot an SCR?
Procedure to Test the SCR with the help of Ohmmeter:
- To test the SCR, connect the positive output lead of the ohmmeter to the anode and the negative lead to the cathode.
- The ohmmeter should indicate no continuity.
- Touch the gate of the SCR to the anode.
- The ohmmeter should indicate continuity through the SCR.
What does SCR failure mean?
Inadequate cooling of semiconductors such as SCR and Diodes can and will cause devices to fail prematurely, some in a matter of minutes depending on the amount of current being carried. If you are experiencing recurring device failure it may be caused by a lack of cooling.
Do SCR have precious metals?
SCR catalysts are made from various porous ceramic materials used as a support, such as titanium oxide, and active catalytic components are usually either oxides of base metals (such as vanadium, molybdenum and tungsten), zeolites, or various precious metals.
What is Volvo SCR?
Volvo Penta’s Selective Catalytic Reduction (SCR) aftertreatment reduces NOx in the engine emissions by introducing diesel exhaust fluid that causes a chemical reaction in the catalysts to form healthy molecules of nitrogen, oxygen and water.
Where is the aftertreatment control module located?
ACM (Aftertreatment Control Module) – the ACM looks just like the MCM and will be located near the emission control equipment on the frame rail or a mounting bracket. The ACM can be difficult to find and may even be located inside the frame rail in a hard to access location (size: 11.5″ wide x 8″ deep by 2″ tall)
How does DEF aftertreatment work?
The DEF solution spray vaporizes and decomposes to form ammonia and carbon dioxide. When the ammonia vapour is introduced to the NOx gas, it converts it to nitrogen and water – a harmless byproduct. DEF is the reactant necessary for the functionality of the SCR system.
