Tenneco introduces SCR system for large marine engines
5 December 2014
Tenneco announced a complete urea dosing control, fluid handling and SCR catalyst system for large marine engines used in US EPA Tier IV and IMO Tier III applications. The company showcased the system at the WorkBoat Show in New Orleans.
The system is designed for high-horsepower engines in the marine, as well as in stationary and locomotive markets. It includes a proprietary urea injector design, a precision fluid delivery pump and customizable remote monitoring and controls.
Tenneco’s large engine SCR system is designed to meet the requirements of major maritime classification societies including the ABS (American Bureau of Shipping), DNV (Det Norske Veritas), CCS (China Classification Society), KR (Korean Register of Shipping) and Class NK (Nippon Kaiji Kyokai). The system is currently being validated with marine and large engine customers, and is expected to be ready for production in 2015.
The system is applicable to a broad range of engine sizes—said Tenneco—and works with electrically or mechanically controlled engines. The airless urea delivery system with dosing control software is capable of managing multiple injection points and sensors. The system can support urea flows up to 120 meters, which enables a wide array of installation options.
The system’s Human Machine Interface (HMI) can be accessed on the front of the fluid delivery box or remotely via a touch screen tablet. It features an interface to access onboard diagnostic functions and to monitor and control all system parameters, including NOx reduction performance and urea concentration levels in real time.
In laboratory validation, the system achieved average NOx reduction efficiency levels of more than 90%, according to Tenneco.
Field tests were conducted on a 224 ft Great Lakes training vessel powered by four 800 hp, 1984 Tier 0 engines. In a series of validation tests, including the ISO 8178 E2 cycle, when outfitted with the aftertreatment system, the 1984 Tier 0 engines met all criteria for IMO Tier III and US EPA Tier III compliance including NOx, HC and SOx.
Tenneco has also tested the same SCR aftertreatment technology in a stationary diesel generator set. A 970 hp, Tier II engine fitted with the SCR system tested over the over ISO 8178 D2 cycle met the criteria for marine EPA Tier IV compliance, said Tenneco.
Source: Tenneco