Due to environmental, energy, and operating cost constraints, the number of liquefied natural gas (LNG)–powered ships is increasing. To avoid decreasing the thermal efficiency of two-stroke, low-speed diesel engines,
high-pressure gas injection is used. The specific energy consumption of a gas fuel compressor is around 0.35
kWh/kg, which has a negative impact on the efficiency of ship power plants. To reduce the primary energy
consumption of a gas fuel supply system, waste heat recovery (WHR) technologies may be used. This study
investigated whether WHR metal hydride technology was suitable for improving the efficiency of low-grade
heat waste in marine diesel engines. The key factors of this technology were revealed, and the design scheme
was described. Working fluids were also analyzed, and a mathematical model of a WHR metal hydride plant
was developed, and the results were represented. The calculations showed that the above technology could
increase the operating power of a propulsion plant by 5.7–6.2%. The results demonstrate the possibility of
applying WHR metal hydride equipment for gas fuel compressor drives in LNG-powered ships. The novelty
of this study lies in the investigation of metal hydride technology for application in the waste heat recovery
systems of LNG-powered ships.
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