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| 2014
780
Viewed
- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 45840 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Taghikhani, Vahid; Bozorg Mehri, Ramin; Ghotbi, Siroos
- Abstract:
- Gas hydrate is a nonstoichiometric structure that has been produced from water and gas in appropriate thermal and pressure conditions. There has been a long time that scientists work on predicting hydrate production condition. Predicting the hydrate behavior for pure substances is easier than mixtures; because there are some behaviors of mixtures that we do not know their reasons yet. In this thesis, there has been tried to give a model to describe hydrate reactions to temperature and pressure changes besides predicting the hydrate type and the cage occupancy. Since the hydrate behavior is nonstoichiometric, it is useful to know the cage occupancy to predict the amount of hydrate production. The chosen method in this work, is modeling by fuzzy logic. Fuzzy logic is a good choice for modeling twisted systems because it is a describing method. In this fuzzy logic modeling, membership functions have been chosen Gaussiantype and the inference engine has been selected Mamdani type. For surveying the system behavior and writing the rules, CSMGem software has been used. The outputs of this software for 1865 input manners have been produced and the fuzzy rules have been written based on them. The final fuzzy model has been made of 540 rules, 7 inputs and 5 outputs. The advantage of this chosen method is in its high speed in processing, no need to have experimental data, coverage of wide range of inputs in comparison to previous works and continuity in outputs. The results of fuzzy logic model have been compared to previous models and it seems that it has a good accuracy
- Keywords:
- Gas Hydrate ; Modeling ; Fuzzy Logic ; Thermodynamic Modeling
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