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Home Tech Automotive

Biofuel combined with advanced engine design shows promise for energy and cost savings

author by author
November 10, 2022
in Automotive, Energy & Green Tech
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truck mountain road
Biofuel, which has significant advantages over petroleum, can be blended with conventional fuels to improve engine performance and slash emissions in cars and trucks. Credit: Pixabay/CC0 Public Domain

Biofuel is closer to becoming a cost-competitive, climate-friendly solution for slashing carbon emissions in cars and trucks, according to two new studies.

The U.S. Department of Energy’s (DOE) Argonne National Laboratory has collaborated with the DOE’s National Renewable Energy Laboratory (NREL), Pacific Northwest National Laboratory (PNNL) and Idaho National Laboratory (INL) on the research. Results showed that biofuel combined with advanced engine design can reduce greenhouse gas (GHG) emissions by roughly 60% while improving fuel efficiency or reducing tailpipe emissions.

Argonne energy system analyst Pahola Thathiana Benavides, NREL process engineer Andrew W. Bartling and PNNL engineer Steven Phillips were lead analysts for the two studies published in ACS Sustainable Chemistry & Engineering.

Biofuel has significant advantages over petroleum gasoline. But the engines themselves are also critical to energy efficiency. Designing low-carbon fuels and engines to work together can maximize energy use and vehicle performance.

“We are at the intersection of new innovations in both engines and biofuel,” said Troy Hawkins, Argonne’s group manager, fuels and products group, an author on both ACS Sustainable Chemistry & Engineering studies. “Our goal was to develop new biofuels blended with conventional fuels to improve engine performance. This means a gasoline-powered car or truck could go further on the same amount of fuel. Or a diesel vehicle could meet more stringent emissions standards.”

In both studies, Argonne scientists worked with other national labs to identify promising fuels for different engine types. Researchers considered cost, environmental impact and potential for expanding to commercial markets.

Argonne is part of the Co-Optimization of Fuels & Engines (Co-Optima) initiative jointly led by DOE’s Office of Energy Efficiency and Renewable Energy, Bioenergy Technologies Office and Vehicle Technologies Office. Co-Optima’s consortium consists of nine national laboratories and over 20 university and industrial partners. The consortium studies how simultaneous innovations in fuel and engines can boost fuel economy and vehicle performance while reducing emissions.

Scientists and experts at every DOE laboratory played an important role in each phase of the research, Hawkins said. “This research is a really good example of how laboratories can work together to help the DOE accomplish its mission.”

Finding biofuel pathways

Co-Optima’s research builds on the goal to identify and understand bioblendstocks, or biofuel. Biofuel is produced from biomass—organic materials including plants, agricultural waste and wet waste. Biofuel can be blended with conventional fuel to reduce emissions and improve fuel and engine performance.

Collaborating with Co-Optima fuel experts, researchers used a screening process to develop a list of biofuels for their research, Benavides said.

Argonne scientists developed the list of biofuels working with experts including PNNL technical team manager and Co-Optima Leadership Team member Daniel Gaspar, NREL senior scientist Gina Fioroni, NREL senior research fellow Robert McCormick, and Anthe George, senior manager at DOE’s Sandia National Laboratories (SNL).

“We worked with other experts to use specific criteria to narrow many biofuel candidates down to a short list for our research. This list was developed based on the required properties and the engine’s combustion mode,” Benavides said.

Converting biomass to biofuel is a complex process involving variables in feedstock, conversion technologies and fuel types. It is especially challenging finding biofuel pathways that also meet economic, technology and energy goals.

Biofuel on the road to energy, cost savings
Credit: ACS Sustainable Chemistry & Engineering (2022). DOI: 10.1021/acssuschemeng.2c00944

One study was co-first-authored by Benavides. The team assessed 12 biofuel production pathways for optimizing multimode internal combustion engines. Multimode engines can deliver greater efficiency and cost savings by using different methods of ignition, combustion and/or fuel-preparation, depending on driving demands.

Researchers used renewable biomass feedstock found in forestry byproducts such as wood waste and agricultural byproducts such as corn stover. They used conversion technologies including either fermentation, catalysis under high heat and pressure, or a combination of both.

“We found that not only can seven biofuels be produced cost-competitively, but that these seven are varied in terms of feedstock used and conversion technology,” Bartling said. “This means that biorefineries can be more flexible in choosing where and how to build their facilities.”

NREL and PNNL researchers did a techno-economic assessment of the biofuel production pathways, analyzing cost and technology performance.

“Our findings showed that many of the biofuels are competitive with the current cost of petroleum fuel,” Phillips said.

Researchers also analyzed environmental impact. A life cycle analysis of the pathways using Argonne’s GREET (Greenhouse Gases, Regulated Emissions, and Energy used in Technologies) model showed impressive results. Ten biofuels have the potential to reduce GHG emissions by 60% compared to petroleum gasoline. The list includes alcohols, furan mixtures and olefins.

Biofuel promising for diesel engines

The second study was co-first-authored by Bartling. Researchers analyzed 25 pathways for producing biofuel optimized to improve combustion for mixing-controlled compression ignition engines. These are a type of diesel engine mainly used for freight transportation.

Biofuel combined with advanced engine design shows promise for energy and cost savings
Graphical abstract. Credit: ACS Sustainable Chemistry & Engineering (2022). DOI: 10.1021/acssuschemeng.2c00781

To develop biofuel production pathways, researchers used feedstocks ranging from plant materials such as wood chips or corn stover, to oils from soybean and cuphea, to wet wastes and recycled grease. They used conversion technologies including fermentation, gasification, and hydrothermal liquefaction.

“The diverse set of biomass resources available in the U.S. has great potential to replace a portion of fuels and chemicals that now come from petroleum,” said Damon Hartley, INL’s Operations Research and Analysis Group lead. “However, one of the largest barriers is the wide variability in quality in the raw materials. This can have a large impact on how the material performs in conversion.”

As with the first study, most of the technologies performed well. Most of the biofuels were cost-competitive with current gas prices.

In terms of environmental impact, GHG emissions were reduced more than 60% in 12 of the 25 pathways, according to the GREET life cycle analysis.

“We evaluated the life cycle GHG emissions for each mixing-controlled compression ignition engine pathway. This included not only the tailpipe emissions but also upstream emissions resulting from biomass cultivation, feedstock transportation, biofuel production and biofuel distribution,” Hawkins said.

Creating a biofuel playbook

Researchers did not intend to produce a definitive list of biofuels, Benavides said. Instead, the studies offer a guide for stakeholders on selecting biofuel pathways that best meet their needs.

“We provide researchers and industry guidance on assessing biofuels based on a number of complex variables,” Benavides said. “The life cycle and techno-economic analysis is important in guiding stakeholders as early as possible. We can’t tell stakeholders what choices to make. But these tools can point them in the right direction from the beginning.”

While many of these biofuel pathways could potentially be cost-competitive, it is too soon to lock in prices in a constantly fluctuating gas market. “The challenge is providing cost-competitive prices in the long term,” Hawkins said.

While these biofuel production pathways target cars and diesel trucks, Argonne researchers are also studying the potential for using these pathways in hard-to-electrify sectors like aviation and maritime industries. The goal is to bring biofuel to market across a range of industries as quickly as possible.

“DOE is constantly working on sustainable solutions for decarbonizing the transportation sector. Biofuel is a big piece of that,” Hawkins said. “We will continue to expand on Co-Optima’s important work.”

Along with Argonne, ORNL, NREL, PNNL, INL, and SNL, other U.S DOE national labs in the Co-Optima Initiative are Los Alamos, Lawrence Berkeley, and Lawrence Livermore national laboratories.

More information:
Pahola Thathiana Benavides et al, Identification of Key Drivers of Cost and Environmental Impact for Biomass-Derived Fuel for Advanced Multimode Engines Based on Techno-Economic and Life Cycle Analysis, ACS Sustainable Chemistry & Engineering (2022). DOI: 10.1021/acssuschemeng.2c00944

Andrew W. Bartling et al, Environmental, Economic, and Scalability Considerations of Selected Bio-Derived Blendstocks for Mixing-Controlled Compression Ignition Engines, ACS Sustainable Chemistry & Engineering (2022). DOI: 10.1021/acssuschemeng.2c00781

Provided by
Argonne National Laboratory

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Biofuel combined with advanced engine design shows promise for energy and cost savings (2022, November 10)
retrieved 10 November 2022
from https://techxplore.com/news/2022-11-biofuel-combined-advanced-energy.html
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Tags: biofuelbiomass feedstockenergy useenvironmental impactfuel efficiencygreenhouse gas
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