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Waste heat recovery in a cruise vessel in the baltic sea by using an organic rankine cycle : A case study

Ahlgren, Fredrik; Mondejar, Maria E. LU ; Genrup, Magnus LU and Thern, Marcus LU (2015) ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 In Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration 3.
Abstract

Maritime transportation is a significant contributor to So x, NO xand particle matter emissions, even though it has a quite low CO2 impact. New regulations are being enforced in special areas that limit the amount of emissions from the ships. This fact, together with the high fuel prices, is driving the marine industry towards the improvement of the energy efficiency of current ship engines and the reduction of their energy demand. Although more sophisticated and complex engine designs can improve significantly the efficiency of the energy systems in ships, waste heat recovery arises as the most influent technique for the reduction of the energy consumption. In this sense, it is estimated that around 50%... (More)

Maritime transportation is a significant contributor to So x, NO xand particle matter emissions, even though it has a quite low CO2 impact. New regulations are being enforced in special areas that limit the amount of emissions from the ships. This fact, together with the high fuel prices, is driving the marine industry towards the improvement of the energy efficiency of current ship engines and the reduction of their energy demand. Although more sophisticated and complex engine designs can improve significantly the efficiency of the energy systems in ships, waste heat recovery arises as the most influent technique for the reduction of the energy consumption. In this sense, it is estimated that around 50% of the total energy from the fuel consumed in a ship is wasted and rejected in fluid and exhaust gas streams. The primary heat sources for waste heat recovery are the engine exhaust and the engine coolant. In this work, we present a study on the integration of an organic Rankine cycle (ORC) in an existing ship, for the recovery of the main and auxiliary engines exhaust heat. Experimental data from the operating conditions of the engines on the M/S Birka Stockholm cruise ship were logged during a port-to-port cruise from Stockholm to Mariehamn over a period of time close to one month. The ship has four main engines Wärtsilä 5850 kW for propulsion, and four auxiliary engines 2760 kW used for electrical consumers. A number of six load conditions were identified depending on the vessel speed. The speed range from 12-14 knots was considered as the design condition, as it was present during more than 34% of the time. In this study, the average values of the engines exhaust temperatures and mass flow rates, for each load case, were used as inputs for a model of an ORC. The main parameters of the ORC, including working fluid and turbine configuration, were optimized based on the criteria of maximum net power output and compactness of the installation components. Results from the study showed that an ORC with internal regeneration using benzene would yield the greatest average net power output over the operating time. For this situation, the power production of the ORC would represent about 22% of the total electricity consumption on board. These data confirmed the ORC as a feasible and promising technology for the reduction of fuel consumption and CO2emissions of existing ships.

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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration
volume
3
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
external identifiers
  • scopus:84954349976
ISBN
9780791856673
DOI
10.1115/GT2015-43392
language
English
LU publication?
yes
id
8ad1fd42-395b-4a3d-8f24-008d1586e5f8
date added to LUP
2017-03-20 11:14:56
date last changed
2017-04-10 15:57:51
@inproceedings{8ad1fd42-395b-4a3d-8f24-008d1586e5f8,
  abstract     = {<p>Maritime transportation is a significant contributor to So <sub>x</sub>, NO <sub>x</sub>and particle matter emissions, even though it has a quite low CO<sub>2</sub> impact. New regulations are being enforced in special areas that limit the amount of emissions from the ships. This fact, together with the high fuel prices, is driving the marine industry towards the improvement of the energy efficiency of current ship engines and the reduction of their energy demand. Although more sophisticated and complex engine designs can improve significantly the efficiency of the energy systems in ships, waste heat recovery arises as the most influent technique for the reduction of the energy consumption. In this sense, it is estimated that around 50% of the total energy from the fuel consumed in a ship is wasted and rejected in fluid and exhaust gas streams. The primary heat sources for waste heat recovery are the engine exhaust and the engine coolant. In this work, we present a study on the integration of an organic Rankine cycle (ORC) in an existing ship, for the recovery of the main and auxiliary engines exhaust heat. Experimental data from the operating conditions of the engines on the M/S Birka Stockholm cruise ship were logged during a port-to-port cruise from Stockholm to Mariehamn over a period of time close to one month. The ship has four main engines Wärtsilä 5850 kW for propulsion, and four auxiliary engines 2760 kW used for electrical consumers. A number of six load conditions were identified depending on the vessel speed. The speed range from 12-14 knots was considered as the design condition, as it was present during more than 34% of the time. In this study, the average values of the engines exhaust temperatures and mass flow rates, for each load case, were used as inputs for a model of an ORC. The main parameters of the ORC, including working fluid and turbine configuration, were optimized based on the criteria of maximum net power output and compactness of the installation components. Results from the study showed that an ORC with internal regeneration using benzene would yield the greatest average net power output over the operating time. For this situation, the power production of the ORC would represent about 22% of the total electricity consumption on board. These data confirmed the ORC as a feasible and promising technology for the reduction of fuel consumption and CO<sub>2</sub>emissions of existing ships.</p>},
  author       = {Ahlgren, Fredrik and Mondejar, Maria E. and Genrup, Magnus and Thern, Marcus},
  booktitle    = {Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration},
  isbn         = {9780791856673},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Waste heat recovery in a cruise vessel in the baltic sea by using an organic rankine cycle : A case study},
  url          = {http://dx.doi.org/10.1115/GT2015-43392},
  volume       = {3},
  year         = {2015},
}