MARITIME

PRODUCT FEATURES
Tenneco: Large Engine SCR System
Tenneco was awarded three product
design assessment (PDA)
certificates from the American
Bureau of Shipping for its new selective
catalytic reduction (SCR) system
for large engines. The PDA certificates
cover key components of the system, including
the complete dosing and control
system, injectors, load sensors and the
human machine interface (HMI) remote
monitor, as well as catalyst and reactor
hardware configurations for both EPA
and IMO applications.
Tenneco’s SCR after treatment system
features a complete dosing control solution
specifically designed for marine
engine applications up to 7,500 kW or
10,000 hp. The system is designed to enable
propulsion and auxiliary engines to
meet EPA Tier IV and IMO Tier III regulatory
requirements and provide precise
and reliable delivery of liquid urea via
a proprietary, high-performance injector
design, a precision mechatronic fluid
delivery pump and customizable remote
monitoring and controls.
In the past year, the company has conducted
a series of field tests to demonstrate
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
in 2014 on a 224 ft. Great Lakes
training vessel powered by four 800 hp,
circa 1984 Tier 0 engines. In a series of
validation tests, including the ISO 8178
E2 cycle, when one of the engines was
outfitted with the after treatment system,
the engine met all criteria for IMO Tier
III including NOx and SOx. In 2015, additional
field tests are currently underway
on a similar training vessel in the
Gulf of Mexico powered by the same
type of engines.
SCR System Features
The SCR system’s modular design enables
seamless integration for a broad
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 120 meters, which enables a wide array
of installation options. Airless urea
injection provides high dosing accuracy
and consistency without the need for
designated compressed air.
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 easyto-use
interface to access onboard diagnostic
functions and to monitor all system
parameters including but not limited
to NOx reduction performance and urea
concentration levels in real time.
TS General Rudder is powered by four, 1982 Caterpillar 800 hp, tier 0 diesel engines.
66 Maritime Reporter & Engineering News • SEPTEMBER 2015