VOLVO SELECTIVE CATALYTIC REDUCTION -
HOW SCR WORKS
JUST SAY NO TO NOx
The EPA regulations introduced in 2010 call for an 83% reduction in NOx from 2007’s already low levels. Volvo has always welcomed efforts to minimize environmental impact and the EPA '10 challenge was no different. Volvo met this standard with a system that delivers near-zero emissions of NOx and particulates, while saving fuel and reducing driver involvement.
ALL THIS - AND FUEL EFFICIENCY TOO!
Volvo’s unparalleled SCR system not only meets environmental regulations; it not only relieves drivers of concern about regeneration; on top of all that, it provides improved fuel efficiency when compared to other systems. Volvo addresses other critical areas that effect fuel efficiency with Fuelwatch, a comprehensive fuel management approach.
HOW OUR ENGINEERS TOOK AN UNSOLVABLE PROBLEM AND SOLVED IT
You don’t need an advanced degree to understand the dilemma (although you may need one to try and tackle it). The conundrum is as follows: when a diesel engine combusts fuel, it produces NOx, a pollutant. It also puts out some soot. If an engineer designs an extremely efficient engine that produces little soot, that same engine (unfortunately) will produce even more NOx.
WHERE THERE WERE ONCE TWO POLLUTANTS, THERE IS NOW NEARLY ZERO
Here’s where our SCR solution really shines. We created an unusually efficient engine, which provides the obvious benefits of fuel efficiency and low particulate emissions. To combat the resultant NOx emissions, our system injects Diesel Exhaust Fluid (DEF) downstream from the DPF. The exhaust gas and the DEF enter a catalytic converter, which turns the NOx into harmless nitrogen gas and water vapor.
DEF IS EVERYWHERE DRIVERS ARE
The DEF is fed into the system from an on-board tank that is simple to fill. Over 2500 Volvo Truck Dealers, truck stops, and other locations in North America offer DEF, and the number is growing every day. A driver can travel from the West Coast to the East Coast and halfway back on a single tank of DEF, passing scores of DEF locations in the meantime.
SCR TOGETHER WITH THE "NO REGEN" ENGINE: A WIN-WIN
Volvo Trucks' system is the only one that meets the EPA’s near-zero NOx emissions requirement while at the same time relieving the driver from ever having to worry about active regeneration in normal highway operations. It all happens seamlessly.
SCR was already good.
Now we’ve made it even better.
NO REGEN ENGINE
When the EPA introduced new emission standards for diesel engines back in 2002, Volvo chose Selective Catalytic Reduction (SCR) as the technology which most efficiently solved the problem of NOx emissions and particulate matter. Our approach combined the best aspects of Exhaust Gas Recirculation (EGR) with a Diesel Particulate Filter (DPF) and a Catalytic Converter to provide the best possible solution.
Active regeneration is a thing of the past.
With Diesel Particulate Filter after treatment, the DPF periodically accumulates particulate matter, or soot, which must be eliminated using a process of active or passive regeneration. In passive regeneration, the NOx is actually used to chemically regenerate the soot in a process that is continuous, low temperature, and automatic.
With EPA ’07 technology, the amount of available NOx is not sufficient for regenerating the DPF. To meet the ’07 standard, engine manufacturers resorted to “active regeneration,” where diesel fuel is added to simply oxidize the soot. This process occurs at a temperature of 1100 degrees or more. The driver must be made aware of high exhaust temperatures when they occur, and must in some cases inhibit or re-enable active regeneration.
For EPA ’10, the Volvo SCR solution eliminates soot using only passive regeneration in nearly all applications. This virtual elimination of active regeneration is what we call the “No Regen Engine.” For normal on-highway operation, active regeneration has been totally eliminated. No dash lights come on. No special driver training. Reduced fuel consumption. Lower operating costs.
General Truck Sales & Service, Inc.
1973 E. Brooks Road
Memphis, Tennessee 38116
1 (888) 462-8658
Located right next to the FedEx Main Hub
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