Abstract
The aim of this research was to investigate the possibility of a combined heat & power (CHP) plant, using the waste heat from a Suezmax-size oil tanker’s main engine, to meet all heating and electricity requirements during navigation. After considering various configurations, a standard propulsion engine operating at maximum efficiency, combined with a supercritical Organic Rankine cycle (ORC) system, was selected to supply the auxiliary power, using R245fa or R123 as the working fluid. The system analysis showed that such a plant can meet all heat and electrical power requirements at full load, with the need to burn only a small amount of supplementary fuel in a heat recovery steam generator (HRSG) when the main engine operates at part load. Therefore, it is possible to increase the overall thermal efficiency of the ship’s power plant by more than 5% when the main engine operates at 65% or more of its specified maximum continuous rating (SMCR).
Highlights
Low speed two-stroke turbocharged diesel engines are the most commonly used marine propulsion engines today
The application of the supercritical Organic Rankine cycle (ORC) during the production of electrical energy and heat, using waste heat energy from the main engine jacket water, scavenged air and exhaust gases has been explored in this work
This paper deals with the savings in fuel consumption for the waste heat recovery (WHR) combined heat & power (CHP) plant using organic fluids
Summary
Low speed two-stroke turbocharged diesel engines are the most commonly used marine propulsion engines today. The uses for exhaust gas heat, taken into account by Shu et al [2], are turbocharger/power, fresh water obtained by using multiple effect distillation or multi-stage flash desalination technology, electric/power obtained from a Rankine cycle system and air conditioning and ice-making obtained by means of sorption refrigeration. They estimated that 2150 kW can be generated using the exhaust gas from a turbocharged diesel engine of 69,900 kW power output to raise the steam in a dual pressure system with a multi stage turbine. Butcher and Reddy [3] carried out a second law analysis of the influence of the gas composition, specific heat and pinch point temperature on the performance of a Heat
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