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Flexibility Analysis of LNG Liquefaction Processes for Small-Scale Application

Shams, Alireza | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57206 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah; Eini, Saeed
  7. Abstract:
  8. Natural gas liquefaction is one of the attractive options for transporting this energy source and making it available on a global scale. However, the processes involved are very energy-intensive and costly. In addition to these issues, the flexibility of liquefaction processes in response to changes in the input natural gas flow is another important aspect to consider in the study of these process systems. In this study, simulation and optimization of PRICO (Poly Refrigerant Integrated Cycle Operations), Nitrogen Expansion, DMR (Dual Mixed Refrigerant), and MFC (Mixed Fluid Cascade) liquefaction processes were performed using rectifying constraints. Then, by considering the optimal state of the processes as the base state and adding two constraints for the refrigerant flow rate and the size of the main exchangers of the processes, equipment changes were avoided. Among the mentioned processes, the MFC process does not have good flexibility compared to the other processes, and if the feed methane percentage increases, this process will not be able to liquefy without equipment changes. The Nitrogen Expansion, PRICO, and DMR expansion processes have good flexibility in the range of feed variations, and the DMR process has a lower Total Annual Cost compared to the other two processes. The Nitrogen Expansion liquefaction process, although it has lower heat transfer efficiency compared to the others, consumes the most energy. It was concluded that the Nitrogen Expansion process has the highest operational costs among the processes studied because the impact of energy costs in liquefaction processes is greater than heat transfer efficiency, and a significant portion of the liquefaction costs includes energy consumption costs
  9. Keywords:
  10. Process Optimization ; Flexibility ; Small Scale Modeling ; Natural Gas Liquefaction

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