Marine Equipment

Marine Diesel Engines / SCR (Selective Catalytic Reduction) System for Marine Engines

Hitachi Zosen possesses an integrated system that spans from design, manufacturing, and sales to after-sales service for large diesel engines used in ships. Since completing our first B&W (currently MAN Energy Solutions SE) diesel engine in 1951, we have accumulated abundant manufacturing experience through cumulative production exceeding 40 million horsepower. Furthermore, we hold licenses for electronically-controlled diesel engines for marine vessels from both MAN Energy Solutions and Winterthur Gas & Diesel (hereinafter, "Win GD"). Under ISO9001 quality control standards, Hitachi Zosen is developing our business to meet diversifying customer needs and stricter environmental regulations, while at the same time taking advantage of the technical advantages presented by double licenses.

Major products

HITACHI - MAN B&W ME electronic control diesel engines

We supply customers with ME engines with various bore diameters. For example, we completed the ME-C engine, which is a MAN B&W electronically-controlled engine, in 2003, and the ME-B engine in 2012. Both of these engines were the first of their kind in Japan. The ME-C provides even more optimized control of the combustion state by eliminating the conventional cam and camshafts, and by performing fuel injection and exhaust valve operations through electronic control with hydraulics. Hitachi Zosen also has a production system for dual-fuel diesel engines (ME-GI). Demand for these engines is increasing due to environmental regulations.

Main achievements

1976 Completed the fuel-efficient TWIN-BANK engine 2x8K45 GTC
1997 Completed the 12K90MC, which had the largest output of any engine in the world at that time
2003 Completed the ME-C engine 6S50ME-C, the first of its type in Japan
2011 Completed the MC-C engine 6S46MC-C equipped with an SCR systems that supports NOx Tier III regulations
2011 Completed the R&D test engine 4S50ME-T
2016 Completed conversion of the test engine to a dual-fuel fired engine using LNG
2016 Completed the ME-C engine 6G60ME-C9.5-HP SCR, equipped with an SCR system
2020 Completed the cutting-edge ME-C engine 7S70ME-C10.5

HITACHI - Win GD X·RT-flex electronic control diesel engine

In 2008, Hitachi Zosen completed the 6RT-flex50-B engine, which is a Win GD electronically-controlled engine. Similar to the MAN B&W ME engine, the cam is abolished and the fuel injection and exhaust valve operations are performed electronically. However, the fuel system for the 6RT-flex50-B is a common rail system boosted to 1,000 bar. This simplification of the fuel injection system is a major feature of Win GD X and RT-flex engines.

SCR (Selective Catalytic Reduction) system for marine engines

Hitachi Zosen completed the world's first SCR system for dual-stroke marine diesel engines that complies with NOx Tier III regulations. This was possible by applying denitration technology that removes NOx, which is also a PM2.5 causative substance, from exhaust gas. This technology has been proven at onshore plants.
This marine vessel SCR system has been jointly developed since 2009 by Hitachi Zosen and MAN Energy Solutions, a licensor of marine diesel engines. The system has been in operation since 2014.
Hitachi Zosen positions "the environment and green energy" as one of our business domains. We actively contribute to the global environment by preventing air pollution and reducing greenhouse gases through technological development and sales of marine vessel SCR systems.

Major features

  1. 1Uses high-temperature and high-pressure exhaust gas on the upstream side of the turbocharger. This makes it possible to use a small catalyst capacity and achieves compact size.
  2. 2Problems related to the responsiveness of the turbocharger are solved by controlling multiple valves provided in the SCR system. This realizes the same responsiveness and followability as the conventional engine.
  3. 3The system is safer and easier to use. For example, it uses urea water as a reduction agent that turns NOx into harmless nitrogen and water.
  4. 4The system is compatible with both low-sulfur fuel and high-sulfur fuel.
  5. 5Selection is made from multiple lineups in order to flexibly respond to the equipment layout in the engine room. Furthermore, we are using operation data as a basis to make the system even more compact, thus reducing the burden of equipment placement.
  6. 6The system can be applied not only to MAN B&W engines, but also to Win GD engines.

Main achievements

2011 Completed the NOx Tier III regulations compliant SCR system for marine vessels for the MC-C engine 6S46 MC-C
2014 Obtained manufacturing supply certification from MAN Energy Solutions for the first time in the world
2014 Our SCR system for marine vessels won the 2014 Marine Engineering of the Year Award
2018 Completed the marine vessel SCR system for ME-C engine 6G60 ME-C9.5
2019 Completed the marine vessel SCR system for ME-C engine 7G80 ME-C9.5
2019 Obtained provisional certification from MAN Energy Solutions for the Mk-II marine vessel SCR system
2020 Completed the marine vessel SCR system for ME-C engine 7S65 ME-C8.5
2021 Completed the first Mk-II marine vessel SCR system for ME-C engine 6S50 ME-C9.6
Hitachi Zosen has received orders for 86 marine vessel SCR systems for our in-house diesel engines and other diesel engines from domestic and overseas manufacturers (as of February 2021).

What are NOx Tier III regulations?

The third tier of regulations for reduction of NOx emissions during ship navigation set by the International Maritime Organization (IMO). Requires an 80% reduction compared to before the Tier I regulations in 2016.

Urea Dilution System

This equipment produces urea water, used as a reducing agent for SCR systems that scrub NOx (nitrogen oxide), from powdered urea and the distilled water obtained from shipboard water production equipment. The urea water storage tank is more compact, and can produce high-quality urea water at low cost on board, contributing to the stable elimination of nitrogen dioxide.

Main achievements
Hitachi Zosen has received orders for 13 installations of urea water production equipment, mainly from domestic shipyards. (As of February 2021)

After-sales service

We provide excellent after-sales service by taking advantage of our advanced technology acquired through design and manufacture, and our vast experience. We control the huge amount of data produced by all our engines with computers and supply optimum parts. We provide the latest technical information on our website.

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