New study show natural gas engine can dramatically reduce smog from heavy-duty trucks

New study show natural gas engine can dramatically reduce smog from heavy-duty trucks


The University of California, Riverside College of Engineering Center for Environmental Research and Technology (CE-CERT) and Southern California Gas Co. (SoCalGas) announced the results of a new study on ultra-low emission natural gas heavy-duty engines, showing a new 11.9-litre engine achieved California’s lowest smog-forming emissions standard, and maintained those emission during all types of driving. 

The study results underscore the ability of the near-zero truck engines to clean the air: most heavy-duty vehicles on roads today are predominantly diesel-powered and represent one of the largest sources of nitrogen oxide (NOx), or smog-forming, emissions and fuel consumption in North America. By contrast, the new near-zero emissions 12-litre engine, made by Cummins Westport, is the only heavy-duty engine in the category to not only meet, but exceed, the California Air Resources Board’s cleanest optional low-NOx standard of 0.02 g/bhp-hr.

Kent Johnson, Assistant Research Engineer at CE-CERT, led the tests on the near-zero emissions natural gas engine. The evaluation included regulated and non-regulated emissions, ultrafine particles, global warming potential, and fuel economy. The testing was performed during in-use testing on a dynamometer that simulated various types of driving conditions, from pulling into a loading dock to regional hauling. Kent performed similar testing on an 8.9-litre near-zero natural gas engine last year. Those results found the smaller engine had even lower emissions than California standards will require in the near future—in some driving conditions, almost zero.

“The first study was a smaller engine intended for use in school buses and trash trucks, which are only about 30 percent of the heavy-duty inventory. The new engine is for drayage and movement of goods, or 70 percent of the inventory. This engine technology is good not only for the smaller work-force applications of transit and refuse, but also for hauling loads around Southern California,” Kent said.

California Energy Commission Commissioner Janea Scott, said: “This type of near-zero pollution engine adds to the growing number of clean energy technologies being developed to reduce pollution in efforts to meet California’s clean air standards and is particularly important in Southern California where air quality continues to be a challenge and freight movement represents a third of the region’s economy.”

“Large scale and accelerated deployment of near zero-emissions engine technology is vital for achieving the necessary emission reductions to achieve federal air quality standards in 2023 and 2031,” said Wayne Nastri, Executive Officer of the South Coast Air Quality Management District.  “To meet our air quality goals, we must continue to see improvements in the transportation sector, which contributes the most air pollution in our region.”

About 41 percent of the state’s greenhouse gas (GHG) emissions come from transportation.  When near-zero emission natural gas trucks are fuelled by renewable natural gas, GHG emissions can be reduced by at least 80 percent. Already, close to 70 percent of natural gas fleets in California are fueled with renewable natural gas and is expected to continue to climb this year.

For more information, visit: ucrtoday.ucr.edu

3rd September 2018

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