Comparison of ship plant layouts for power and propulsion systems with energy recovery

Benvenuto, G.; Campora, Ugo; Trucco, Alessandro

doi:10.1080/20464177.2014.11658117

Cited by 20 publications

(19 citation statements)

References 3 publications

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“…Table 15 summarizes the data regarding the annual fuel outlay saving and the subsequent payback time (i.e., the time required for the savings to repay the cost of the investment) of the considered PPS plant types. The results presented in Table 15 are valid even in the case of normal seagoing condition with tank heating, condition not considered in this paper, but reported in [23]. The cost of each PPS used to calculate the payback time is merely indicative and it has been roughly estimated with the support of MAN.…”

Section: Power and Propulsion Systems Comparisonmentioning

confidence: 50%

“…As shown in recent literature [16,[19][20][21][22][23][24], an increase in the energy conversion efficiency can be achieved recovering part of this wasted thermal energy through WHR devices. In previous studies [22,23] the authors optimized and compared some different Thermo Efficiency Systems (TES), capable to recover part of the exhaust gas thermal energy of a two-stroke marine diesel engine, by means of a steam plant, assisted in some cases by a gas turbine.…”

Section: Combined Diesel and Steam Turbine Propulsion And Power Plantsmentioning

confidence: 89%

“…The waste heat recovery plants examined so far can be coupled in different manner with the board services of the reference ship [23]. In what follows four different machinery plant schemes are proposed to satisfy the mechanical, electrical and thermal power requirements of the considered tanker ship.…”

Section: Power and Propulsion System Layoutsmentioning

confidence: 99%

“…In previous studies [22,23] the authors optimized and compared some different Thermo Efficiency Systems (TES), capable to recover part of the exhaust gas thermal energy of a two-stroke marine diesel engine, by means of a steam plant, assisted in some cases by a gas turbine. In the mentioned study the TES plants optimization was focused on the advantage of better energy conversion from thermal to mechanical form.…”

Section: Combined Diesel and Steam Turbine Propulsion And Power Plantsmentioning

confidence: 99%

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Waste Heat Recovery from Marine Gas Turbines and Diesel Engines

et al. 2017

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Abstract:The paper presents the main results of a research project directed to the development of mathematical models for the design and simulation of combined Gas Turbine-Steam or Diesel-Steam plants for marine applications. The goal is to increase the energy conversion efficiency of both gas turbines and diesel engines, adopted in ship propulsion systems, by recovering part of the thermal energy contained in the exhaust gases through Waste Heat Recovery (WHR) dedicated installations. The developed models are used to identify the best configuration of the combined plants in order to optimize, for the different applications, the steam plant layout and the performance of WHR plant components. This research activity has allowed to obtain significant improvements in terms of energy conversion efficiency, but also on other important issues: dimensions and weights of the installations, ship load capacity, environmental compatibility, investment and operating costs. In particular, the main results of the present study can be summarized as follows: (a) the quantitative assessment of the advantages (and limits) deriving by the application of a Combined Gas And Steam (COGAS) propulsion system to a large container ship, in substitution of the traditional two-stroke diesel engine; (b) the proposal of optimized WHR propulsion and power systems for an oil tanker, for which a quantitative evaluation is given of the attainable advantages, in terms of fuel consumption and emissions reduction, in comparison with more traditional solutions.

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Section: Power and Propulsion Systems Comparisonmentioning

confidence: 50%

Section: Combined Diesel and Steam Turbine Propulsion And Power Plantsmentioning

confidence: 89%

Section: Power and Propulsion System Layoutsmentioning

confidence: 99%

Section: Combined Diesel and Steam Turbine Propulsion And Power Plantsmentioning

confidence: 99%

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Waste Heat Recovery from Marine Gas Turbines and Diesel Engines

et al. 2017

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“…Although there exist a significant number of publications on trade-off studies regarding different power and propulsion concepts of ships (Benvenuto, Campora, and Trucco, 2014;McIntyre and Gemmel, 2012;Partridge, Arén, Lindqvist, and Johansson, 2012;Sofras and Prousalidis, 2014), as far as known to the authors the effect of uncertainty on both the technical and financial comparison between various concepts has not been demonstrated in literature. This is surprising, especially since the importance of a good understanding of uncertainties is likely to grow with increasing complexity of ship systems and associated simulation tools required to enable both technical and financial analysis of complex ship energy grid systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of uncertainty on techno-economic trade-off studies: ship power and propulsion concepts

Vrijdag

Boonen

Lehne

2018

Journal of Marine Engineering & Technology

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Results of trade-off studies aiming to compare different ship power and propulsion configurations inherently contain uncertainty. This is true for both the technical part and for the financial part of the trade-off study. The technical part typically includes the system characteristics of the vessel as inputs, resulting in predicted fuel consumption and emissions at various ship speeds. Fuel consumption numbers subsequently feed into the financial part of the analysis which typically includes prices of equipment, fuel prices or fuel price scenarios, the discount factor and other aspects such as the operational profile which plays an important role in the trade-off study. Finally, financial KPI's such as Net Present Value and payback period can be compared between different power and propulsion concepts, thereby supporting decision makers in the selection of a specific configuration or retrofit. In this paper, the effect of uncertain input parameters on both the intermediate technical output and on the financial KPI's is demonstrated by means of a case study. The study shows that the uncertainty associated with relevant KPI's is sufficiently large to warrant further investigation beyond accepting model predictions as completely accurate, particularly when conducting techno-economic tradeoff analysis of ship power and propulsion configurations. In the broader context, consideration of uncertainty is a must for statutory and regulatory authorities in the formulation of policy.

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Marine Waste Heat Recovery System

Fuente

2017

Encyclopedia of Maritime and Offshore Engineering

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The usage of wasted energy in human‐made processes to reduce the need of more energy coming from raw materials has been recorded since the Industrial Revolution. Shipping, being the most energy‐efficient means of transportation, commonly uses waste heat recovery systems on board to further increase its operative efficiency. Waste heat is used to produce steam or electricity which is consumed on board. As main engines' thermal efficiencies start to plateau because they are close to the theoretical maximum efficiencies and as emission regulation becomes more stringent, it is important to look for alternative usages, processes, and designs of waste heat recovery systems.The purpose of this article is to give the reader a broad idea of how the energy on board a ship can be reutilized in order to increase the ship's fuel consumption, hence reducing the emission of noxious gases (e.g., CO2and NOx) into the environment. Also, it explores traditional and alterative waste heat recovery processes, usages, and systems, which are installed on board nowadays or could be in the near future. This work focuses mainly on the use of the ship's prime mover waste heat, but this does not mean that the technologies and approaches described in this article cannot be applied to other systems such as auxiliary engines or electrical generators on board.This article starts with the history of waste recovery systems and then moves for a brief description of different marine CO2‐mitigating strategies and where the available waste heat can be found on board. It then covers what a thermal machine is and how it can be used to produce heating, cooling, and mechanical and electrical power through different thermodynamic and electrical processes. Finally, it concludes that traditional and alternative waste heat recovery systems installed on board are important players in achieving more efficient shipping.

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Comparison of ship plant layouts for power and propulsion systems with energy recovery

Cited by 20 publications

References 3 publications

Waste Heat Recovery from Marine Gas Turbines and Diesel Engines

Waste Heat Recovery from Marine Gas Turbines and Diesel Engines

Effect of uncertainty on techno-economic trade-off studies: ship power and propulsion concepts

Marine Waste Heat Recovery System

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