Communications Internationales
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/11
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Item Characterization of used engine oil and possibility of recovery(2018) Zerdane, Youghourta; Hachemi, M.; Tazrout, M.; Largeau, Jean-FrançoisThe world today is facing major energy and climate challenges. The growth of global energy demand, the decline in fossil reserves and the dangerous disruption of the climate caused by pollution compels states and scientists to quickly adopt plans strengthened action on renewable energies and the treatment of different types of waste generated by human activity, such as used motor oils in order to preserve the environment and to find other sustainable and economically viable solutions. This work, based on a characterization study of used motor oil, has shown that these characteristics deteriorate after a certain time of use compared to a new oil and that they become polluting due to contamination by inorganic elements (metal). The high calorific value of the used oil can be considered as an important source of energy, hence the need to develop a process for the upgrading of this waste and for this purpose it is envisaged to explore later one of these ways which is pyrolysisItem Symmetrical voltages dips analysis in a wind turbine based on DFIG for high power conversion(Springer, 2023) Bouregba, Hicham; Hachemi, M.; Mekhilef, S.; Ratni, A.The most common source of renewable energy generation worldwide is wind turbines (WT) based on doubly-fed induction generators (DFIGs). To keep such sources connected to the grid during outages, low voltage ride-through (LVRT) capacity must be increased. Due to its vulnerability to grid disruptions, it is essential to follow stringent methods to keep DFIG connected to the grid. As a result, this study employs the crowbar resistance protection approach on a practical 2MW to improve WT’s LVRT. Under steady-state and symmetrical grid disturbances, the effectiveness of the DFIG-based WT with crowbar resistance is investigated and compared. The dynamic performance of the proposed scheme is analyzed to that of the existing capacitor bank system using a variety of metrics in order to demonstrate its efficacity. The modeling and simulation tools MATLAB and Simulink are used in this study. The findings reveal that the suggested LVRT capability outperforms the competition in practiceItem Investigate Method to Reduce Methane Emission during Maintenance Operations from Algerian Natural Gas Transportation(2017) Louhibi–Bouiri, Mounia; Hachemi, M.Methane concentration in the atmosphere has critically increased recently, its account for about 50% of the greenhouse gases (GHG) emissions. Increasing environmental concern and global warming have made it become an imminent consideration. The energy sector is the second largest contributor to methane emissions. The emissions of natural gas from gas transportation pipeline are an important factor for global warming. For this article we try find a way for preventing of waste this source because of economical aspect and environmental problems. First we calculate the volume of gas venting from pipeline and then get quantity of money value of this gas then we suggest a mobile compressor for saving this gas. Pipeline pump-down technique with portable compressor solution instead of venting will mainly allow 54.873 million m3 gases saving, which costs about 11.628 million USD and benefits justified purchase of 4 portable compressorsItem Mechanical performance study of mortars containing local sewage sludge ash(2019) Benoudjit, Fouzia; Hachemi, M.The amount of sewage sludge from wastewater treatment plants is continuously increasing and becoming a serious issue for environment. Therefore, the valorisation of sewage sludge in sectors such as the construction field where there is high demand for naturel resources would be great for the environment. The present work reports the possibility of using sewage sludge ash as substitute for cement CEM II/A-P 32.5 R in mortars. Various ratio of sewage sludge ash (10%, 20% and 30%) was used in addition to cement, and mechanical attributes of resulting mortars, were tested at various curing ages and compared with control samples. The obtained results have revealed that sewage sludge ash can be used as a substitute of part of the cement in mortar and. The substitution can be as high as 30% while maintaining a compressive strength within the standard NF EN 197-1 requirements at 28 days.Item Truck tire pyrolysis optimization using the self-produced carbon black as a catalyst(2017) Akkouche, N.; Balistrou, Mourad; Hachemi, M.; Himrane, N.; Loubar, K.; Tazerout, M.