Latest MAN Diesel & Turbo success!

Emissions, Environment, Marine Equipment Products and Services, Shipbuilding and Shipyards, Technology — By on April 5, 2016 at 2:28 PM
Integrated design of EGR unit (orange) into an MAN B&W 6G70ME-C9 engine

Integrated design of EGR unit (orange) into an MAN B&W 6G70ME-C9 engine

MAN Diesel & Turbo Delivers World’s First IMO Certified Two-Stroke Engine with Tier III NOx Control,  Exhaust Gas Recirculation Systems

Hyundai’s Ship Building Division (HHI-SBD) has finalised a contract for 2 × Suezmax tankers for Turkish shipowner, Ditas Shipping. The 158, 000-m3 crude-oil tankers will each be powered by individual MAN B&W 6G70ME-C9.5 two-stroke main-engines that feature integrated Exhaust Gas Recirculation (EGR) systems. While there are already IMO Tier III-compliant vessels with EGR systems in service, the Suezmax newbuildings will be the first vessels with keel-laying after 1 January, 2016 to be officially certified as complying with Tier III emission restrictions within existing North American NOx Emission Control Areas (NECAs) and the United States Caribbean Sea NECA.

Exhaust Gas Recirculation (EGR)
EGR is a NOx emissions-control technology that works by recirculating a
portion of an engine’s exhaust gas back to the engine cylinders. MAN Diesel &
Turbo originally developed, designed, and manufactured the first EGR system
for a two-stroke marine diesel engine for operation on a container vessel in
service in 2010.

Operating-Principle
A part of the exhaust gas is drawn through a scrubber, cooler, and water mist
catcher by suction created from an electrically driven, specially designed
blower. The blower raises the pressure of the exhaust gas, which is then
mixed with the charge air via a unique charge air pipe, before entering the
main-engine coolers.

Within the scrubber, the exhaust gas is washed with water, which
consequently becomes acidic depending on the sulphur from the fuel in the
exhaust gas dissolving in the water. Sodium hydroxide dosing is therefore
required to neutralise the acidic scrubber water. In addition, the scrubber
washes out particulate matter (PM) that becomes suspended in the scrubber
water, and it is therefore necessary to have a water treatment system (WTS)
to remove PM from the scrubber water, and discharge the PM as
concentrated sludge into the sludge tank on the vessel. The WTS is designed
for cleaning the scrubber water to such an extent that it can be discharged into
open sea.

A fully automated control system provides for easy operation for the ship’s
crew and correct and swift reactions to engine load variations.
Rationale behind G-type introduction

Following efficiency optimisation trends in the market, MAN Diesel & Turbo
thoroughly evaluated the possibility of using even larger propellers and
thereby engines with even lower speeds for the propulsion of tankers and bulk
carriers.

Such vessels may be more compatible with propellers with larger diameters
than designs so far used, and therefore able to facilitate higher efficiencies
following adaptation of the aft-hull design to accommodate a larger propeller.

It is estimated that such updated aft-ship designs with the G-series of engines
offer potential fuel-consumption savings of some 4-7%, with a similar
reduction in CO2 emissions.

Simultaneously, the engine itself can achieve a high thermal efficiency using
the latest engine process parameters and design features.
About MAN Diesel & Turbo
MAN Diesel & Turbo SE, based in Augsburg, Germany, is the world’s leading provider of large-bore diesel and gas engines
and turbomachinery. The company employs around 15, 000 staff at more than 100 international sites, primarily in Germany,
Denmark, France, Switzerland, the Czech Republic, India and China. The company’s product portfolio includes two-stroke
and four-stroke engines for marine and stationary applications, turbochargers and propellers as well as gas and steam
turbines, compressors and chemical reactors. The range of services and supplies is rounded off by complete solutions like
ship propulsion systems, engine-based power plants and turbomachinery trains for the oil & gas as well as the process
industries. Customers receive worldwide after-sales services marketed under the MAN PrimeServ brand.

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