TY - JOUR
T1 - Utilizing the scavenge air cooling in improving the performance of marine diesel engine waste heat recovery systems
AU - Mito, Mohamed T.
AU - Teamah, Mohamed A.
AU - El-Maghlany, Wael M.
AU - Shehata, Ali I.
PY - 2018/1/1
Y1 - 2018/1/1
N2 - This paper aims at improving power generation efficiency of marine diesel engine waste heat recovery systems. It presents a novel technique of integrating the heat rejected in the scavenge air cooling process and the exhaust gas in operating a single and dual pressure steam power generation cycles. Moreover, a thermodynamic analysis of proposed systems was performed to identify the optimum operating parameters for achieving an overall efficiency improvement. The analysis considered the exergy destruction in each component and the energy/exergy efficiencies. A performance analysis was conducted to assess applicability and power output at off design conditions. An evaluation of achieved improvements by suggested designs was presented from both an economical and environmental standpoint. In conclusion, results show that, the recommended cycle increased overall efficiency improvement from 2.8% for the conventional system to 5.1%, with an additional power output of 1210 kW, representing 9.7% of the engine's power. Also, exergy efficiency increased significantly by 6.6% when using the presented system. Furthermore, the waste heat recovery system attained a reduction in fuel consumption of 1538 Ton/year, reducing carbon dioxide emission by 4790 Ton/year.
AB - This paper aims at improving power generation efficiency of marine diesel engine waste heat recovery systems. It presents a novel technique of integrating the heat rejected in the scavenge air cooling process and the exhaust gas in operating a single and dual pressure steam power generation cycles. Moreover, a thermodynamic analysis of proposed systems was performed to identify the optimum operating parameters for achieving an overall efficiency improvement. The analysis considered the exergy destruction in each component and the energy/exergy efficiencies. A performance analysis was conducted to assess applicability and power output at off design conditions. An evaluation of achieved improvements by suggested designs was presented from both an economical and environmental standpoint. In conclusion, results show that, the recommended cycle increased overall efficiency improvement from 2.8% for the conventional system to 5.1%, with an additional power output of 1210 kW, representing 9.7% of the engine's power. Also, exergy efficiency increased significantly by 6.6% when using the presented system. Furthermore, the waste heat recovery system attained a reduction in fuel consumption of 1538 Ton/year, reducing carbon dioxide emission by 4790 Ton/year.
KW - Emission reduction
KW - Energy management
KW - Marine diesel engine
KW - Rankine cycle
KW - Ship power plant
KW - WHR
UR - http://www.scopus.com/inward/record.url?scp=85032859432&partnerID=8YFLogxK
UR - https://www.sciencedirect.com/science/article/pii/S0360544217317085?via%3Dihub
U2 - 10.1016/j.energy.2017.10.039
DO - 10.1016/j.energy.2017.10.039
M3 - Article
AN - SCOPUS:85032859432
SN - 0360-5442
VL - 142
SP - 264
EP - 276
JO - Energy
JF - Energy
ER -