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Tenneco launches new SCR system for large engines

Tenneco, a global supplier of Clean Air after-treatment technologies, has introduced a complete urea dosing control, fluid handling and catalyst solution for selective catalytic reduction (SCR) after-treatment, enabling large engines to meet EPA Tier IV and IMO Tier III regulations.

The system is designed specifically for high-horsepower engines in the marine, stationary and locomotive markets, providing precise and reliable delivery of liquid urea. It includes a proprietary, high-performance injector design, a precision mechatronic fluid delivery pump and customisable 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's modular design enables seamless integration for a range of engine sizes and works with electrically or mechanically controlled engines. It has been validated for durability and all components are easy to maintain and service without the need for special tools.

The fluid delivery system with dosing control software is capable of managing multiple injection points and sensors. The system can support urea flows up to 120m, which enables a wide array of installation options. Airless urea injection provides high dosing accuracy and consistency.

The system's unique 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 easy-to-use interface to access on-board diagnostic functions and to monitor and control all system parameters, including but not limited to NOx reduction performance and urea concentration levels in real time.

Tenneco's new marine SCR system has demonstrated effective NOx reduction in bench and field testing. In laboratory validation, the system achieved average NOx reduction efficiency levels of more than 90%.

In addition to effective emissions reduction, field testing highlighted how the system's form, fit, function and performance capabilities can be integrated into a vessel's engine and control architecture. Field tests were conducted on a 224ft Great Lakes training vessel powered by four 800 horsepower, circa 1984 Tier 0 engines. In a series of validation tests, including the ISO 8178 E2 cycle, when outfitted with the after-treatment system, the 1984 Tier 0 engines met all criteria for IMO Tier III and EPA Tier III compliance including NOx, HC and SOx.

Tenneco has also tested the same SCR after-treatment technology in a stationary diesel generator set, demonstrating the system's flexibility and scalability across multiple applications. When installed on a 970 horsepower, Tier II engine running ISO 8178 D2 cycle, the engine met all criteria for marine EPA Tier IV compliance.

Tenneco offers expertise designing proprietary mixing technology to efficiently convert injected urea droplets into the desired ammonia without the formation of deposits, especially in low temperature applications. For applications incorporating high-sulfur diesel fuel, Tenneco also offers soot blowers, which can be easily incorporated into the SCR system and integrated with the dosing control unit.