Japanese shipowner K Line has installed an experimental binary cycle waste heat recovery system (WHRS) on 91,000m3 coal carrier Corona Youthful.
The system, developed by Kobe Steel, can generate 100 kW of electricity from main engine exhaust heat. The three-year pilot study aims to verify the system’s durability and performance under operating conditions.
Kobe Steel began developing a binary cycle system for ships in 2014, following earlier land-based projects. A sea trial using a prototype was conducted in 2016.
The system, which can be used with main engines of more than 5MW, has received approval from class societies ClassNK, Lloyd’s Register and DNV GL.
Binary cycle power generation produces electricity by using a steam turbine. Low-temperature heat sources including warm water, low-pressure steam or air are used to vaporise a substance with a low boiling point, which drives the turbine.
In a statement, Kobe Steel notes that the novel WHRS is designed to help ships achieve the greenhouse gas emissions reductions that IMO is hoping to achieve. “By effectively using the exhaust heat to generate electricity to serve as auxiliary power for the ship, the system contributes to reducing carbon dioxide and fuel for the generator engines,” the company says.
The project has been undertaken with the support of Japan’s Ministry of Land, Infrastructure, Transport and Tourism and ClassNK.