Caterpillar Engines Use SCR Technology to Meet U.S. EPA Tier 4 Final and IMO Ⅲ Emissions Standards

摘要

With U.S. Environmental Protection Agency (EPA) Tier 4 Final emissions standards a reality for dredges as of this year, engine manufacturers and dredge owners have different options to consider for meeting the standards. Engines with a power range of 2,682 to 4,962 hp (2,000-3,700 kW) were affected first by the new standards, but all new engines with maximum power 600 kW (804 hp) and greater must meet U.S. EPA Tier 4 Final emission standards by October 2017. Caterpillar's solution for dredging applications uses a selective catalytic reduction (SCR) system to reduce nitrogen oxides (NOx). Ryan Darnell of the product value engineering department at Caterpillar Inc. spoke at the WODCON (ⅩⅩⅠ) conference in Miami in June on "Legislation and Innovation in the Lifecy-cle Consideration of Dredging Industry Power Solutions." IDR spoke with him afterwards about different engine options for dredges, why Caterpillar uses the SCR system and other engine design considerations.