Intelligent Marine Diesel Engines have been state of the art main engines employed by value-added new ship including large container vessel. The distinguishing characteristics of the large two-stroke intelligent marine diesel engines refer to their very low exhaust gas temperature (about 250℃ at NCR, Normal Continuous Rating) after turbochargers and their very huge amount of exhaust gas. Due to its very low exhaust gas temperature after the turbocharger, it is more difficult to recover their waste heat. However, the mass flow rate of the exhaust gas is quantitatively huge so that to recover waste heat from the large two-stroke intelligent marine diesel engines is hot and full of challenge. In this paper, thermodynamic models for two traditional WHR systems—ordinary Rankine Cycle (RC) conceptual waste heat recovery system and Organic Rankine Cycle (ORC) conceptual waste heat recovery system matching MAN B&W 10S90ME—a typical intelligent marine diesel engine—are derived and numerically calculated. Numerical results indicate that the very low exhaust gas temperature of this intelligent marine diesel engine has led the impracticable installation of traditional WHR systems onboard.
This work is financially supported by the Universities’ Natural Science Funding of Jiangsu Province under contract No. 10KJD480001 and the Qing-Lan Project of Jiangsu Province for universities’ outstanding youth skeleton teachers under contract No.161220605.
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