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Mitsubishi Heavy Completes First Unit of Latest Version of Waste Heat Recovery System for Marine Engines

The MHI STG system. Click to enlarge.

Mitsubishi Heavy Industries, Ltd. (MHI) has completed its first unit of the STG (Super Turbo Generating) System, a marine-use, high-efficiency, combined power generation system that utilizes waste heat and the exhaust gas from diesel engines.

The STG System reduces the fuel cost of vessels by 10%, effectively recovers exhaust gas energy and ultimately contributes to efforts to prevent global warming, according to MHI. The STG System is the most recent type of the company’s MERS (Mitsubishi Energy Recovery System) that utilizes waste energy from marine diesels for power generation.

The STG System (Super Turbo Generating System). Click to enlarge.

The STG System comprises an exhaust gas power turbine, an economizer (exhaust gas boiler), a steam turbine, a generator, a reduction gear box and an SSS (synchronous self-shifting) clutch and control system.

This system uses exhaust gas from main engine to drive an Exhaust Gas Power Turbine, which is connected to steam turbine with the SSS Clutch. The STG system generates 2.4 to 2.8 times more power generation than the basic MERS system, according to MHI. In the event the STG power generation exceeds an electric demand in the vessel, the surplus power can assist the main thrust shaft through the shaft generator to reduce the main engine fuel consumption—i.e., a hybrid boost.

The first STG System will be installed in a container vessel currently being built by Daewoo Shipbuilding & Marine Engineering Co., Ltd. of Korea, and will be delivered to A.P. Møller - Mærsk A/S, a Danish shipping company, in 2011.

MHI has already received orders for 38 units of the STG System and at present is also receiving a number of inquiries. Many of these orders and inquiries are for use on container vessels, which carry numerous energy-consuming refrigeration/chilling container units. With the successful completion of the first unit, MHI plans to reinforce its marketing activities targeting newly-built vessels.

MHI leverages its technological expertise as a major shipbuilding company handling essential components for marine-use waste energy recovery systems such as diesel engines, turbochargers, steam turbines and boilers for the new, energy-saving STG System.

Earlier this month, Opcon, the Sweden-based energy and environmental technology Group, said that it will install an Opcon Powerbox—an Organic Rankine Cycle (ORC) waste heat recovery system—on a Wallenius ship. (Earlier post.)



gotto besaid

Good Idea - most ships cant use all the waist heat in the waist heat boiler and combining the steam generated with the exhaust overflow is a good idea. Also 10% energy saving is a huge fuel saving on a ship and will certainly appear to be cost effective to allow refits

fred schumacher

It was waste heat recovery that made steam powered vessels possible: first, double-conversion steam engines to make powered vessels viable, and second, triple-conversion that ended the era of sail. This new technology is another step in the process, making IC diesel engines as efficient as fuel cells.

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