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原文传递 WJ Editorial

题名：	WJ Editorial
正文语种：	eng
摘要：	The California Air Resources Board (CARB) is expanding its Commercial Harbor Craft rule to all marine vessels (except fishing vessels) to reduce particulate matter (PM)-i.e., soot-emissions. The only way commercial marine vessels with engines of 600 kW or above can comply is to install Tier 4 engines with diesel particulate filters (DPFs) attached- never mind that there are no existing feasible DPFs yet for commercial tugboat diesel engines. Despite years of behind-the-scenes conversations and a letter of concern from the Coast Guard, CARB has ignored the marine industry's concerns. Tugboat and towboat operators say the mandate, with a mere six-month window, amounts to an unachievable ultimatum that will force many operators to either go out of business or leave the state and relocate elsewhere. Since the Environmental Protection Agency issued strict PM emission rules in 2007, CARB has required DPFs on all land-based diesel engines. The idea behind DPFs is simple enough. They are essentially small aftertreatment bolt-on filtered furnaces, designed to capture diesel exhaust carbon soot particles and apply very high heat (up to 600 degrees Fahrenheit) to ignite catalysts in the filter to burn them into harmless ash, a process called regeneration. DPFs can remove anywhere from 85 percent to close to 100 percent of soot from diesel emissions, in theory.
出版年：	2023
期刊名称：	The Waterways Jouranl
卷：	137
期：	22
页码：	4-4