Browsing by Author "DAOUDI Ikram"

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    Calculation of Theoretical Stages Using the McCabe–Thiele Method: Simplified application to the ASU Bellara
    (National Higher School of Technology and Engineering-Annaba, 2025) BOULEGANE Yassmina; DAOUDI Ikram; AZZOUZ Salaheddine (Encadrant)
    This work investigates the cryogenic air separation process at the Bellara industrial site and it’s based on Number of theoretical stages' estimation of the high pressure (HP) and low pressure (LP) distillation columns. The separation is treated as a binary system consisting of nitrogen and oxygen. With insufficient detailed process data, the McCabe–Thiele graphical method was employed under the simplifying assumptions based on a steady-state Aspen hysys simulation. It was found that 28 and 41 theoretical stages are necessary in the HP and LP columns, respectively, amounting to a total of 69 theoretical stages in the distillation system. Using theoretical column efficiencies of 80% for the HP column and 60% for the LP column, the estimated numbers of real stages are about 35 for the HP column and 68 for the LP column which is consistent with the expected range. This result provides a realistic approximation of the number of stages of this double system distillation column. Therefore, for preliminary work, the study shows that graphical methods, combined with software simulation techniques today is widely reliable. Future work will aim to develop algorithms to better reflect real operating conditions.
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    Study of the Energy Performance of the Air Gas Production Unit at the Bellara Complex
    (National Higher School of Technology and Engineering-Annaba, 2025) BOULEGANE Yassmina; DAOUDI Ikram; AZZOUZ Salaheddine (Encadrant)
    The cryogenic air separation is a critical step in industrial applications requiring high purity oxygen and nitrogen production such as steel making industries. This study focuses on evaluating the performance of the air separation unit located in Bellara, Jijel, using Aspen HYSYS V11 simulations, thermodynamic reference tables, and process flow diagrams. Key performance indicators were established as follows: the separation efficiency was determined at 21.66%, within the expected range for double-column systems, while the overall efficiency was found to be 53%. The specific energy consumption for the total pure product was 0.47 kWh/kg, compared to 0.74 kWh/kg for high-purity oxygen. Despite facing major challenges due to limited access to actual plant data, mainly due to confidentiality policies, the study successfully produced a technically reliable and insightful analysis. Importantly, the unit has not yet exhibited any significant degradation in performance, and the results obtained serve as proof of stable operation. This study demonstrates that simulation and thermodynamic analysis can effectively uncover performance insights even when real data is incomplete