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Analysis of Optimal Power Reduction Schemes for An LNG Plant

Abdul Razik, Abdul Halim (2007) Analysis of Optimal Power Reduction Schemes for An LNG Plant. Masters thesis, Universiti Teknologi PETRONAS.

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In this work, a typical Mixed Refrigerant Cycle (MRC) for the production of liquefied natural gas (LNG) has been selected for the analysis of potential power reduction schemes. However, such analysis requires complete process data for the MRC liquefaction process flowsheet. Unknown data were be subjected to rigorous simulation and reconciliation. Data reconciliation approaches for the MRC flowsheet involved the combination of structural decomposition of complex units and systematic estimations of unknown variables. Simulations performed and the data obtained is validated against published data. The errors in the data were reconciled by minimizing the sum of squared error (SSE) between the simulated data and the published data. After five iterations, the reconciliation trial with the smallest SSE of 0.002% was selected and considered as the base case MRC process flowsheet. The base case flowsheet was then analyzed to establish its thermodynamic performances using WORK software. The software also optimized the mixed refrigerant compositions. Three power reductions schemes have been proposed that include the process expander, the multistage compressions with intercoolers, and the multistage compressions with intercoolers incorporating the process expander. Each of the proposed schemes was compared, utilizing both the current and the optimized mixed refrigerant compositions. As a result, six power reduction options were generated. Each of the six options was then simulated on HYSYS.

Item Type: Thesis (Masters)
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Ahmad Suhairi Mohamed Lazim
Date Deposited: 26 Jan 2015 16:04
Last Modified: 25 Jan 2017 09:45
URI: http://utpedia.utp.edu.my/id/eprint/14475

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