Thesis (M.M.P.)--University of Delaware, 2008. / Principal faculty advisor: Gerard J. Mangone, College of Marine & Earth Studies. Includes bibliographical references.

This research is a preliminary design study relating to the importation of liquefied natural gas (LNG) in the United Kingdom, focusing on the process design, simulation and control of a flexible LNG reception terminal. The primary operating objective of the proposed LNG reception terminal is to accept a wide variety of LNG feedstocks, and to continuously produce output with consistent specifications. This requirement to provide "feedstock flexibility" was the major influence in the development of this research. The process design was derived from the application of selection criteria to assess the impact of feedstock flexibility on process unit performance. The subsequent dynamic simulation had to represent multiple operating conditions and feedstock changeovers for a multicomponent system. This required the incorporation of an interactive physical properties database and the adoption of a pseudo-binary distillation column model in the simulation. Regulatory control loops were developed and tuned to provide stable operation for all the plant's operating conditions. In order to assess the impact of multiple feedstock conditions, control system performance was evaluated for disturbance rejection and control valve action. A changeover mechanism was developed which enabled successful dynamic simulation of feedstock changeovers. The simulation also identified significant interactions between certain process units in the flowsheet. In conclusion, the primary objective of the supervisory control system would be management of these interactions as opposed to maintenance of product specifications. This work has provided a preliminary flowsheet and a design tool for process and control studies, for a flexible LNG reception terminal. These will enable the design engineer to investigate a range of changes to the process design and to assess their implications for the plant's overall dynamic behaviour.

No description available.

Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Chemical Engineering. / Bibliography: leaves 63-65. / M.S.

Thesis. 1978. Sc.D.--Massachusetts Institute of Technology. Dept. of Chemical Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Vita. / Bibliography: leaves 421-426. / by Jaime A. Valencia-Chávez. / Sc.D.

The global use of natural gas is growing quickly. This is primarily attributed to its favorable characteristics and to the environmental advantages it enjoys over other fossil fuels such as oil and coal. One of the key challenges in supplying natural gas is the form (phase) at which it should be delivered. Natural gas may be supplied to the consumers as a compressed gas through pipelines. Another common form is to be compressed, refrigerated and supplied as a liquid known as liquefied natural gas (LNG). When there is a considerable distance involved in transporting natural gas, LNG is becoming the preferred method of supply because of technical, economic, and political reasons. Thus, LNG is expected to play a major role in meeting the global energy demands. This work addresses the simulation and optimization of an LNG plant. First, the process flowsheet is constructed based on a common process configuration. Then, the key units are simulated using ASPEN Plus to determine the characteristics of the various pieces of equipment and streams in the plant. Next, process integration techniques are used to optimize the process. Particular emphasis is given to energy objectives through three activities. First, the synthesis and retrofitting of a heat-exchange network are considered to reduce heating and cooling utilities. Second, the turbo-expander system is analyzed to reduce the refrigeration consumption in the process. Third, the process cogeneration is introduced to optimize the combined heat and power of the plant. These activities are carried out using a combination of graphical, computeraided, and mathematical programming techniques. A case study on typical LNG facilities is solved to examine the benefits of simulation and integration of the process. The technical, economic, and environmental impact of the process modifications are also discussed.

Thesis. 1978. M.S. cn--Massachusetts Institute of Technology. Dept. of Chemical Engineering. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE. / Bibliography: leaves 124-131. / / by Otto J. Solis. / M.S.cn

Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemical Engineering. / Microfiche copy available in Archives and Science. / Bibliography : leaves 414-426. / by Lucile M. Shanes. / Ph.D.

Thesis (Doctoral)--Technische Universiteit Delft, 1997. / Includes bibliographical references (p. 149-155).

Thesis (Doctoral)--Technische Universiteit Delft, 1997. / Includes bibliographical references (p. 149-155).