COLD ENERGY UTILIZATION FROM LNG REGASIFICATION PROCESS

., Khuong Minh Cam Tu (2012) COLD ENERGY UTILIZATION FROM LNG REGASIFICATION PROCESS. [Final Year Project] (Unpublished)

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Abstract

Energy savings becomes one of the important effects to reduce the effect of global
warming. Effective utilization of the cryogenic energy associated with LNG
regasification gains more and more important to this energy issue. LNG
regasification plant operates in combined cycle mode comprising ammonia Rankine
cycle and a Brayton power cycle of combustion gas, open LNG cycle, interconnected
by the heat transfer process in the recuperation system. LNG at low temperature of -
162oC and atmosphere pressure is gasified by absorbing heat from hot fluid of
Rankine cycle. Typically ammonia is used as the working fluid for Rankine cycle.
Then the LNG will be superheated by exhaust gas of Brayton cycle evaporation
system as the cycle cold sink, the cycle condensation process can be achieved at a
temperature much lower than ambient without consuming additional power. By using
this thermal sink in a combined cycle plant that produces both power and gas, it is
possible to recover cold energy from vaporization of LNG.
Energy equilibrium equations and exergy equilibrium equation of each equipment in
the cascading power cycle are established. Taken some operating parameters as key
parameters, influences of these parameters on thermal efficiency and exergy
efficiency of the cascading power cycle were analyzed. The net power overall after
optimization is obtained at 22099.45kw compared to initial value which is only at
20175.41kW. The project objectives have been achieved. The research shows that it
is able to identify the opportunity for cold energy recover from LNG regasification
process by electricity generation and the optimization of heat recovery system is
successfully achieved.

Item Type: Final Year Project
Subjects: T Technology > TP Chemical technology
Departments / MOR / COE: Engineering > Chemical
Depositing User: Mrs SHARIFAH FAHIMAH SAIYED YEOP
Date Deposited: 26 Mar 2013 10:16
Last Modified: 25 Jan 2017 09:39
URI: http://utpedia.utp.edu.my/id/eprint/6093

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