Online Exclusive: Accelerating the transition to renewable fuels

M. Carugo and J. Valentine, Emerson Automation Solutions, Austin, Texas

The global push to neutralize carbon-based greenhouse gas (GHG) emissions by 2050 not only holds great promise for the future of the planet, but it also stands to create millions of jobs, spur rapid growth and drive technological innovation. Businesses in every industry around the world have rolled out environmental and social responsibility (ESR) initiatives, often with bold plans to decarbonize their operations in line with the global 2050 net-zero goal, although these plans differ in scope and strategy. Since the transportation industry accounts for roughly 30% of all GHGs in the U.S., new kinds of renewable fuels made from organic sources (such as plant oils or animal waste) are expected to play a leading role in the transition to an environmentally sustainable economy.

 How policy and technology changes are shaping biofuels’ future.

Biofuels are not new. At 17.5 Bgpy, ethanol, which is made from corn and mixed with gasoline, is the most-produced alternative transportation fuel in the U.S. Having been developed in the 1970s and put into wide use by the 1980s, its advantages and cost-related drawbacks are well understood. Today’s new green fuels are sourced from agricultural waste and crops that are chemically identical to traditional fossil-fuel-based products; however, they provide better performance with a smaller carbon footprint.

Advances in automation technologies make it more feasible to convert previously unusable raw materials (e.g., switchgrass and used cooking grease) into feedstocks that can be processed into high-quality combustible fuels that compete with fossil-based products like jet fuel and automotive gasoline—as well as, increasingly, electric power and natural gas. Meanwhile, leaders in the airline, railroad and trucking sectors have begun powering their fleets with renewable fuels, all of which have created opportunities for savvy downstream operators to stay ahead of the curve.

Carbon intensity (CI) is the amount of GHG emissions per unit of transportation energy delivered during a fuel’s “well-to-wheel” lifecycle—measured in grams of carbon dioxide (CO2) equivalent per megajoule of energy. Waste-based biofuel feedstocks, such as used cooking oil, have lower CI scores than those that could be turned into an edible food source (e.g., corn). Other factors affecting CI include the distance from feedstock source to the processing facility, and the energy and GHG emissions required to process the fuel into a finished product.

Research shows that, depending on assumptions about future policies and societal norms, the decline in the share of hydrocarbons in the global energy system could be dramatic, especially with the corresponding rise in demand for renewable energy as the world increasingly electrifies. If the 2050 net-zero goal is met, then the share of hydrocarbons in primary energy streams could drop from around 85% in 2018 to between 20%–70%, with the share of renewable energy increasing to between 20%–60%.4

Government programs such as the European Green Party’s Green New Deal, and the European Union’s Renewable Energy Directive (RED II) that sets the target for renewable consumption at 32% by 2030, are primary reasons why more refiners are exploring these new fuels today. The U.S. government currently offers federal tax credits to biofuel refiners, and Canada, California and Oregon have implemented their own low-carbon fuel standards (LCFS), which use a system of incentives and penalties to encourage industries to meet CI goals in both the manufacture and use of renewable transportation fuels.

How the market landscape is shifting.

These policies have driven real changes in the market. Data from California shows that, as fossil-based ultra-low-sulfur diesel (ULSD) consumption decreased between 2011– 2020 and CI dropped along with it, renewable diesel and other biofuels more than made up the difference in supporting demand without effecting CI. Biodiesel consumption worldwide has more than doubled over the last 10 yr to 682,000 bpd and is growing at over 11%/yr. Current market forecasts see global demand for renewable diesel on the rise through 2026 at beyond.

The combination of government policies, corporate initiatives and recent breakthroughs in automation technology have turned more sustainable renewable fuels like green diesel and sustainable aviation fuel (SAF) into the fastest-growing alternative energy streams in the market. SAF, which produces up to 70% less carbon than fossil fuels, could effectively bridge current renewable technologies with future hybrid, electric or hydrogen-powered engine designs.

In February 2022, Singapore’s civil aviation authority announced it would support the city-state’s flagship carrier Singapore Airlines in buying SAF from ExxonMobil to fuel part of its passenger fleet. Finnish oil refiner Neste Oyj will provide 1.25 MMl of SAF, which is mixed with refined jet fuel at ExxonMobil’s facilities in Singapore. This 1-yr pilot program is expected to reduce CO2 emissions by about 2,500 metric t.


What leading refiners can do to seize the opportunity.

The most pressing challenges for refiners in the global downstream oil and gas space are meeting key performance indicators (KPIs) while also maintaining the flexibility to handle different production processes, as well as ensuring equipment reliability with demanding feedstocks, following complex regulatory requirements to secure government subsidies, and advancing refiners’ own corporate social responsibility and sustainability initiatives.

Ensuring feedstock flexibility and measurement certainty.

Staying in the black while breaking ground on new renewable fuel plants and retrofitting others means that refiners must obtain the very best production yield possible, while meeting quality specifications. This requires highly accurate process measurements to calculate CI data, along with advanced analytics software to evaluate overall plant performance under varying feedstock scenarios.

Traditional level and flow measurement technologies are impacted by changing fluid properties and ambient conditions, which are unavoidable when processing animal fats, corn oil, recycled cooking oil or vegetable oil. Smart flow metering systems and level instrumentation that can handle different fluid properties in a wider range of environments make it easier to dependably meter fluid transfers and to report receipts, usage and shipments.

Optimizing yield and asset health in new processes.

Average yields from the second-generation renewable diesel process depend on many operating factors. Having precise control over the complex processes inside a plant’s reactors is key for avoiding over-cracking products and for meeting quality and emission standards. Control directly affects reactor catalyst life, which is a major cost concern. Analytics software can identify optimum operating conditions for each feedstock type, and, additionally, can calculate ideal production targets and provide early warnings to potential issues so that operators can maximize diesel yield while also reducing waste disposal and streamlining maintenance.

Always a priority, equipment reliability is even more critical when processing highly corrosive biomass feedstocks. Asset health monitoring solutions (e.g., corrosion sensors installed on critical vessels) are more common, but corrosion data can be difficult to interpret and act upon. Wireless ultrasonic sensors with data historian software extend vital equipment life by enabling proactive maintenance well before workers’ security lapses and production throughput can suffer from safety incidents and unplanned downtime.

Reporting to regulations, minus the headaches.

While the renewable fuels market owes its continuing growth largely to government subsidy programs, these policies impose complex reporting rules that require licensors to store data in an agile, secure place that can serve a variety of functions. Renewable diesel plants must meet extensive federal and state reporting requirements. In North America, the U.S. Environmental Protection Agency (EPA) and the U.S. Internal Revenue Service (IRS) work with state agencies to administer tax incentive programs that require refiners to gather extensive data from many sources, such as reconciled pathways, contracts, invoices, transportation and custody chain documentation. Penalties and fines are enforced for reporting errors.

Aggregating the data in a central repository is common, but companies often find themselves drowning in swamps of data that they cannot use. Companies need a data management strategy that will enable them to connect to all sources—and to also make the data useful in the right context, whether it is operational decisions, regulatory reporting, trend analysis or whatever is needed.

The authors’ proprietary digital ecosystem platforma features data lake tools that help aggregate, historicize and organize information required for reports and analytics, as well as for integrated visualization tools and KPI dashboards—all with real-time secure remote access. This technology makes it possible to effectively automate the entire regulatory data gathering, analysis, visualization and reporting workflows—and to have the flexibility to accommodate future fuel standards and inevitably changing requirements, which is crucial in such a fast-evolving market.

Advancing refiners’ sustainability initiatives.

With the growing impact of decarbonization on socioeconomic priorities worldwide, tasks such as accurately tracking CI data, continuously monitoring and predicting emissions, maximizing energy efficiency, identifying waste, and measuring the impact of operational decisions have never been more imperative for downstream manufacturers.

Renewable diesel plants are large consumers of electric power and of hydrogen, which involves complicated energy-intensive process interactions. Lower CI numbers mean more LCFS credits but gathering and calculating the information accurately is complicated by varying feedstocks and plantwide energy consumption data, which is often only available after the fact in monthly reports. Fortunately, it is now possible for renewable diesel plants to maximize their CI credits by using energy management information systems (EMISs), powered by artificial intelligence, that can provide real-time energy performance data and reduce total site energy usage by up to 15%.

Two other areas where automation can help are pressure relief valve (PRV) monitoring and flare gas analysis. Locating the source, time and duration of releases from PRVs requires extensive hands-on work and data interpretation, but wireless pressure gauges, acoustic transmitters and analytical software can record and interpret PRV events, making it easier to find and seal leaks. Of course, fugitive emissions are a concern for many valve types in a refinery, which is why the authors’ company’s low-emissions valve seal packing systems are rigorously designed and tested to ensure that ambient conditions meet the U.S. EPA’s 100-parts-per-million (ppm) concentration requirement.

Finally, all refineries flare vented gases into the atmosphere as a byproduct of normal operations. Precise measurement and analysis of the flare are critical to monitor emissions and ensure efficient combustion. Sophisticated instrumentation and control systems can detect precise changes in gas composition and can respond in real time to optimize combustion efficiency and keep emissions within targeted levels.

Key takeaways.

Leading refiners have been preparing for the world to eventually phase out fossil fuels for years—not only because this is the socially responsible thing to do, but because it also makes good business sense. Reducing emissions and optimizing energy consumption means achieving lower cost of operations and extracting greater value from resources. In some countries, producers are carving out 40%–60% of their refining capacity to produce green fuels. The implementation of new technology, software and analytics increases reliability, optimizes energy, lowers emissions and reduces the overall environmental impact.

Downstream operators are in a unique position to invest in these technologies and to get in on the ground floor as the transportation industry’s transition to renewable fuels picks up momentum. Those who fully recognize the potential competitive advantage that automation can deliver could be the leaders in the renewable fuel market in the next decade and beyond.


a Emerson Automation Solution’s Plantweb digital ecosystem


MARCELO CARUGO works with upstream and downstream manufacturers globally to create a clear and actionable path to operational excellence and digital transformation through applications of automation technologies. He joined Emerson in 1998 and has more than 30 yr of experience in the chemical and refining process control industries, both domestically and internationally. Mr. Carugo received an electronic engineering degree from the University of Buenos Aires, Argentina; a post graduate diploma in electronic engineering from PIITS in the Netherlands; and a Master of electronic engineering with honors from NUFFIC in the Netherlands.

JULIE VALENTINE is Director of Global Refining Flow Solutions for Emerson. She first joined Emerson in 1993 and worked as the Refining Industry Marketing Manager for Micro Motion products for 14 yr. In 2015, she became responsible for all of Emerson’s flow technologies for the refining industry. Ms. Valentine has authored numerous technical papers on various applications of flow technology in the refining industry and is a co-inventor on two U.S. patents. She is a member of several working committees for the instrumentation and control group of API’s Refining and Equipment Standards program. She holds a BS degree in chemical and petroleum refining engineering from the Colorado School of Mines.


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