Marine propulsion system with large turbocharged two-stroke reciprocating piston engine with waste heat recovery and method for operating the marine propulsion system

Abstract

A marine propulsion system (1) with waste heat recovery, and main large two stoke turbocharged internal combustion engine (2) driving a propeller shaft (3) that is coupled to a ship propeller (4) . The waste heat recovery system (11) includes a turbine (18) and a generator (20) for generating electrical energy from waste heat of the main engine (2) for an electrical network (5) of the ship. A shaft generator / motor (10) is coupled to the propeller shaft (3) and connected electrically to the electrical network (5) of the ship. The shaft generator / motor (10) is configured to convert electrical energy from the electrical network (5) into mechanical energy for driving the propeller shaft (3) in a drive motor operation mode of the shaft generator / motor (10) and the shaft generator / motor (10) is configured to convert mechanical energy from the propeller shaft (3) into electric energy for the electrical network (5) in a generator operation mode of the shaft generator / motor (10). A controller (16) is operably connected to the shaft generator / motor (10) and the controller (12) is configured to control the frequency of the electrical network by adjusting the operation of the shaft generator / motor (10)

Description

technical field [0001] The present disclosure relates to a method of operating a marine propulsion system utilizing waste heat recovery, and to a marine propulsion system utilizing waste heat recovery. Background technique [0002] WO2007 / 124968 discloses a marine propulsion system for a large cargo ship such as a container carrier, typically such a propulsion system includes a main engine in the form of a slow speed two-stroke diesel engine for generating mechanical energy to drive a propeller drive shaft. The engine's continuous power rating starts at about 5MW and ends above 110MW. [0003] The electrical loads on a ship are usually provided by the ship's electrical grid, which receives power from a generator that runs on an internal combustion engine that runs faster than the main engine (genset). These are usually generator sets driven by four-stroke diesel engines. More recently, the demand for lower emissions and lower operating costs in recent years due to rising ...

AI Technical Summary

Problems solved by technology

Not operating at its maximum capacity means efficiency is lost, as part of the 'free' energy from the waste heat system is not utilized

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