MES announced what is believed to be its first order for its THS2 turbo hydraulic system in February (image: MES)
What is believed to be the first order for Mitsui Engineering & Shipbuilding’s (MES) latest version of its turbo hydraulic system (THS2) was placed in February for installation on a Mitsui-MAN B&W 7S65ME-C8.5 engine for a 208,000dwt bulk carrier.
This technology has its roots in a concept first developed in 2008 that took excess turbocharger energy via a hydraulic pump and matching hydraulic motor to provide additional propulsion power. It has been fitted to 19 ships and gone through a number of iterations over the years.
MES said in a statement in February that THS2 improves fuel efficiency by up to 2% on a single engine at 50% load operation or more when the hydraulic energy recovered from the turbocharger is also used to open and close the exhaust valves and fuel injection of an electronically-controlled engine. It is a refinement that has been under development since 2016.
An earlier modification had made it possible to operate the system in ‘turbocharger assist’ mode when the engine is operating at low load. Instead of using the auxiliary blower to supplement the turbocharger, the hydraulic pump and motor can be operated in reverse to deliver engine power to support its turbocharger “and contribute to the reduction of greenhouse gases,” MES said.
In its statement, MES also noted that among THS’s benefits is that it requires fewer parts to be fitted to an engine than other waste heat recovery technologies, reducing cost and space.