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原文传递 Pathways To The Energy Future Of the Inland Waterways

题名：	Pathways To The Energy Future Of the Inland Waterways
正文语种：	eng
作者：	DAVID MURRAY
摘要：	"There is no single silver bullet or unicorn technology" for lowering emissions, said Gary Sarrat of Caterpillar Marine. Instead, there are many choices, each with trade-offs to consider. Sarrat was speaking on "Sustainability Solutions for Marine Segments" at The American Waterways Operators' Summer Safety Meeting in downtown St. Louis on August 16-17. The meeting featured several panels and presentations on green tech for the inland waterways, all packed with information. Mike Bres-lin, AWO's director of safety and sustainability, introduced panelists and speakers. Sarrat noted that Caterpillar has increased its communications with its customers about its research and development efforts in green technologies and what they might mean for them. Sarrat's presentation covered Cat's engine upgrades, services, electric and hybrid powertrains, lower-car-bon-intensity fuels and regulated emissions. He said companies are getting more sophisticated about calculating their carbon cycles. "Just going to an alternative fuel doesn't always mean fewer emissions," he said. "Under some circumstances, methanol can have a carbon cycle with more carbon emissions than fossil fuels." Sarrat went over the pros and cons and tradeoffs of alternative fuels from biofuels and renewable diesel to methanol, liquid hydrogen, compressed hydrogen and battery-stored electricity. He explained the concept of "volumetric density," or the amount of energy per equivalent volume. Hydrogen has zero carbon emissions but requires 10 times more volume than diesel for an equal amount of energy. Even liquefied hydrogen still requires five times the volume of diesel. It also requires a lot of energy to liquefy it and keep it cool, reducing its overall carbon efficiency.
出版年：	2023
期刊名称：	The Waterways Jouranl
卷：	137
期：	21
页码：	7-8