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Conception, analyse exergétique et optimisation des cycles à mélange de réfrigérants : Application à la liquéfaction du bio-méthane

Abstract : The growing fossil fuel consumption is leading to depletion of natural gas reserves. Hence, a considerable interest is given to the use of biogas as substitute for natural gas. However, for certain applications, biogas must be liquefied to facilitate its transport and storage. Many studies have focused on large and mid-scale natural gas liquefaction processes with a lack of literature studies on biogas micro-liquefaction. Due to the similarities between biomethane and natural gas, mixed refrigerant (MR) cycles for natural gas liquefaction are considered to liquefy the biomethane. The prime objective of this doctoral work is to develop a thermodynamic refrigeration cycle with low energy consumption and eventually nonflammable refrigeration for micro-scale biomethane liquefaction. In order to procure the needed cooling of biomethane liquefaction processes, different configurations are proposed. The first two architectures are mixed refrigerant cycles carrying out both sensible (pre-cooling) and latent (condensation) heat removal. The latest architecture, mixed refrigerants are nonflammable. All configurations are simulated in Aspen HYSYS and assessed considering the exergy analysis method. In order to find the optimum operating parameters and the best design, a tool integrating PIKAIA genetic algorithm and Microsoft Visual Basic (VBA) was developed. Once the steady state simulation and optimization are achieved, a study of the dynamic behavior of the process at partial load operating mode is conducted. The design of an architecture suitable for liquefaction with a capacity of 10 Nm3 / h was made. A techno-economic study of this bench was developed to evaluate the total updated cost for the liquefaction of biomethane.
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Imane Oudghiri Yousfi. Conception, analyse exergétique et optimisation des cycles à mélange de réfrigérants : Application à la liquéfaction du bio-méthane. Génie des procédés. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEM037⟩. ⟨tel-02950825⟩

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