At Case IH, we’ve spent years preparing for this shift. You see, we believe it's possible for you to increase performance and productivity while also preserving and improving the global environment.
What is SCR?
Emissions regulations established by the U.S. Environmental Protection Agency (EPA) and Canadian Environmental Protection Agency (CEPA) continue to evolve and Case IH strives to ensure we are using the most up to date technology to meet those standards with a simple solution that promotes optimal productivity in the field.
Making Sense of Emissions Standards
Emission requirements may be changing, but you're dealing with the same production challenges and demands you always have. That's why you need equipment that will not only meet the stringent emissions standards, but will also deliver the power and performance you expect.
Emissions Basics
The Tier 4 standards require that emissions of Particulate Matter (PM) and Nitrogen Oxides (NOx) be further reduced by about 90%. PM is composed of minute particles and pollutants, which pose serious health risks for people and animals and contribute to the cause of acid rain and ground level ozone.
Diesel Engines Facts
When the engine is operating most efficiently for power, minimal PM is produced. but the NOx levels are very high. When exhaust gas is recirculated back into the intake, the NOx production is reduced; but higher levels of PM are created. In either situation, an exhaust aftertreatment system is needed to reduce the levels of remaining pollutants.
The Solution
Inside the combustion chamber PM and NOx have conflicting chemical factors. No diesel engine can be designed to meet both PM and NOx emission standards without the use of control technologies in an advanced exhaust gas aftertreatment system. That’s why Case IH continues to innovate with our partners to ensure simple solutions such as SCR.
SCR Compared to Other Emissions Technology
SCR (Selective Catalytic Reduction)
SCR is a simple system that maximizes engine power and treats exhaust gasses with a second fluid to eliminate pollutants.
+ More power: Engines are tuned for maximum horsepower, without compromising efficiency for emissions, resulting in better performance.
+ Fuel economy: Fine-tuning the combustion process and eliminating exhaust gas recirculation provides substantial improvement in fuel efficiency.
+ Reliability/Durability: Greater durability, increased reliability and lengthened service intervals are all achieved by eliminating the recirculation of exhaust gas contaminants back into the engine.
- Additional fluid: Requires the use Diesel Exhaust Fluid (DEF).
EGR (Exhaust Gas Recirculation)
EGR recirculates exhaust back into the engine and uses a particulate filter to capture pollutants.
+ No additional fluid: Does not require Diesel Exhaust Fluid (DEF).
- Larger Engine Cooling Package: Recirculating 25-30% hot exhaust gas in the engine has a major impact on the cooling system, particularly on large engines under high-duty cycles.
- Hot Exhaust Temperatures: During required particulate filter regeneration, exhaust temps can reach up to 1292°F, which is nearly twice the normal operating exhaust temperature.
- Increased Maintenance Cost: Oil change frequency increases due to higher levels of exhaust gas recirculation.
10 Reasons Why SCR is the Right Choice
- Lower fuel consumption: The efficiency of the combustion process and smaller engine displacement, combined with greater horsepower, optimizes fuel consumption.
- Outstanding performance: Since SCR is an after-treatment system, the engine is designed to maximize torque and power with faster response in the field.
- Longer service interval: The optimized combustion process preserves oil’s physical properties, reducing maintenance activities and related downtime.
- High reliability: SCR system allows the engine to reduce heat rejection of many internal engine components, leading to better reliability.
- Unbeatable durability: The reduction of PM inside the engine eliminates clogging problems and the need for regeneration often required with EGR.
- Compact packaging: SCR systems are more thermodynamically efficient than Tier 3/Stage IIIA engines. This allows for greater horsepower from smaller engines.
- Wide fuel compatibility: SCR systems work regardless of fuel quality and are not influenced by the presence of traditional pollutant substances in the fuel. No part of Tier 4 particulate control involves the use of ultra-low sulfur diesel.
- User-friendly solution: SCR systems are simple. The only thing you have to do is refill the DEF at regular fuel intervals.
- Environmental care: Pollutants produced during the combustion process are converted into harmless N2 and H2O, already present in the environment.
- Advanced technology: SCR is recognized by many engine manufacturers as the technology of the future to be compliant with Tier 4 final/Stage IV.
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