NDLI: Thermodynamic assessment of integrated heat recovery system combining exhaust-gas heat and cold energy for LNG regasification process in FSRU vessel

Content Provider	Springer Nature Link
Author	Lee, Sangick Choi, Byung Chul
Copyright Year	2016
Abstract	A thermodynamic assessment of an integrated heat recovery system, which simultaneously recovers both the cold energy of LNG released into seawater and the exhaust gas heat of diesel generator released into ambient air during the regasification process in a LNGFSRU vessel, has been carried out. For the LNG regasification unit consisting of two-stage heat exchangers, a primary Rankine cycle was applied as a typical power cycle of the type A for recovering cold energy to the first-stage heat exchanger. A secondary Rankine cycle of the type B was serially inserted between the first-stage and the second-stage heat exchangers for recovery of the remaining cold energy of preheated LNG. Then, in the type C, the exhaust gas, which had a relatively high temperature, was applied as the heat source of the secondary Rankine cycle, instead of seawater. In such a sequential procedure, the type C was finally suggested as an integrated heat recovery system, in which the seawater and exhaust gas were combined as the heat sources. When the net outputs produced from each heat recovery system were maximized by changing the pressure and mass flow rate of working fluid, the thermal efficiency of the integrated heat recovery system of the type C was η $_{I,EG}$ = 0.0741. The results showed an improvement of approximately 13.3% (25.6%) in the thermal efficiency compared to the value of η $_{I,SW}$ = 0.0654 ( η $_{I}$ = 0.0590) for the conventional cold energy recovery system of the type B (the type A), which only used seawater as the heat source. Based on this finding, a possibility of utilizing the integrated heat recovery system with the combined cycle within the LNG-FSRU was confirmed.
Starting Page	1389
Ending Page	1398
Page Count	10
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	30
Issue Number	3
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2016-03-12
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	LNG-FSRU Heat recovery LNG Seawater Exhaust gas Rankine cycle Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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