https://repository.sustech.edu/handle/123456789/20491 2026-04-09T09:13:27Z 2026-04-09T09:13:27Z Ali, Yasir Abdalla Dafaalla Supervisor, -Gurashi Abdalla Gasmelseed Co-Supervisor, -Tomadir Awad Ibraheem Hamed https://repository.sustech.edu/handle/123456789/27810 2022-11-14T11:18:27Z 2021-10-21T00:00:00Z

Upgrading of Heavy Crudes and Residue for Liquid fuels production Ali, Yasir Abdalla Dafaalla; Supervisor, -Gurashi Abdalla Gasmelseed; Co-Supervisor, -Tomadir Awad Ibraheem Hamed Trends have predicted that peak oil production, will be reached around 2020-2030, where the production of oil starts to decline after that, there will be less and less oil to refine, the depletion of light oil and the severe shortage of light products is what compelled us to search for solutions to provide the necessities, observe that the crude that feeds the refineries have become more heavy, so it was necessary to develop oil refining processes to meet the production requirements in quantity and quality. This study aims to search for solutions to the problem of heavy sudanese crude oil and residues to produce light products to fill the shortage, and El Obeid refinery was taken as a case. A detailed simulation of an atmospheric distillation column was performed using Aspen Hysys v.10 software. The model was based on data from the actual plant located in El Obeid refinery in North of Kordofan. Crude oils were described using True Boiling Point (TBP) assays and a Peng-Robinson package was used to predict thermodynamic properties. Three different types of crude oils (Nile Blend, Rawat, Thargath), and 7 blends with different proportions were selected from the previous crude oils. The simulation results agree well with those of the industrial plant in the case of the Nile blend and the validity of the model is confirmed. The conversion ratio to high-value light products in the atmospheric distillation tower of the Nile blend ware 31%vol, Rawat were 39.7%vol, Thargath were 24.22%vol, Mix 1 were 30.51%vol, Mix 2 were 26.62%vol, Mix3were 31.23%vol, Mix 4 were 28.96%vol, Mix 5 were 30.47%vol, Mix 6 were 27.97%vol and Mix 7 were 27.81%vol. It was proposed to add a new unit (atmospheric distillation tower) identical to the first distillation tower to increase the inputs to the second proposal (vacuum distillation tower) to convert the residues of towers into light products, four streams were selected from to feed their residues to the vacuum distillation tower, and the residues were converted to high-value light products. The selected streams were (Nile Blend, mix 1, mix 3 and mix 7) and the percentage of convertion into light products were (52.57%, 57.48% ,62.57% and 66.94%) by volume respectively. These results clearly indicate that blending the Sudanese heavy crudes improves their properties and gives better desired products than Nile blend as in Mix 1, Mix 3 and Mix 7. Thesis

2021-10-21T00:00:00Z Fadelelseed, Abdeldaim Abdelgader Ali Supervisor, -Ahmed Ibrahim Ahmed Co-Supervisor, -Ramadan Mohamed Ahmed https://repository.sustech.edu/handle/123456789/27158 2022-04-11T07:57:38Z 2022-02-12T00:00:00Z

The Use of Glass Fiber Reinforced Epoxy Composite in Automotive Bumper Applications Fadelelseed, Abdeldaim Abdelgader Ali; Supervisor, -Ahmed Ibrahim Ahmed; Co-Supervisor, -Ramadan Mohamed Ahmed The application of composite materials to structures nowadays presented the need for engineering analysis and modeling to understand failure mechanisms. Modern automotive industry reveals that plastics can be reinforced to form new materials which can exhibit similar mechanical properties required for structural components of a vehicle, compared to metals. Glass fiber reinforced polymer (GFRP) multidirectional composite laminates are vital for tensile and flexural strength of structures where mechanical properties can be optimized. The following laminates were produced with hand layup technology: [+45° / -45°] s, [0° / 45° / 90°] oriented [+45° / -45° / 90°] s, denoted as G4, G16 and G26 respectively. Prepared samples were tested for tensile, flexural and drop weight tests using relevant ASTM standards. The experimental results showed a significant improvement in the mechanical properties of G26 foil. The tensile and bending strengths were higher than those of G16 and G4. As expected, this is ultimately due to the longitudinal orientation of the fibers in G16. Three finite element (FE) models of G4, G16 and G26 were also established under the influence of a low velocity using specialized software. Different energies 3, 9 and 15 J were applied to the samples. The finite element (FE) curve obtained by simulation was analyzed and compared to the (Force- Displacement) FD curve obtained experimentally. The level of higher values of forces obtained from scalar is almost identical to the level of maximum force values obtained from experimental tests. However, there was difference in level of displacement between them. Highest power obtained from G26, followed by G16, then G4. The bumper performance was determined by FE analysis taken for mechanical properties and applied to the software (Abaqus). The G26 design is the best for absorbing bumper energy. More tests and analysis are recommended to confirm the relationship and to validate economic feasibility Thesis

2022-02-12T00:00:00Z Mohamd, Ashraf Eltayib Dafallah Supervisor, -Essam Abbakar Eshaq Co-Supervisor, -Alfateh Abbas Alqourashi https://repository.sustech.edu/handle/123456789/26729 2021-10-17T09:25:47Z 2021-07-22T00:00:00Z

Applying industrial management for improving productivity In Dubai steel factory in Sudan Mohamd, Ashraf Eltayib Dafallah; Supervisor, -Essam Abbakar Eshaq; Co-Supervisor, -Alfateh Abbas Alqourashi The iron and steel industry is an important basic industry of Sudan national economy and plays a vital role in the process of industrialization and urbanization. Prosperity in steel sector reflects positively in national income. Steel industries have many challenges in production processes that hinder improvement of productivity and hence to decrease in efficiency, to notice these challenges facing production of steel industry Dubai steel factory in Sudan was taken as a sample of steel factories .The objective of this study was to define the steel production problems, this was done through construction of comprehensive questionnaire, this questionnaire was design to display the problems based on the analysis of the data.. The questionnaire was divided to two parts one for labors and Foremen, and the other for Engineers and Administrators. The questions were oriented to any part according to their knowledge and also to get correct answers and make strategic plan. Modification routinely used formula in steel bar industry was applied by adding silicon and manganese alloy for bar steel manufacturing, this was done by considering all the variation that effect on steel specification to render it more flexible with high quality and less time for treatment. Three hundred and three reports (have specifications of melting) were taken to study the relationship among all the elements in the report to determine the relation between the elements and the amount of alloy added to melting, the new formula was used in the production line of steel bar. Strategic plan made according to questionnaires data analysis to raise the productivity and finally calculation the productivity for materials, labors and machines. Calculation of productivity for labors, materials and machines v will help Dubai steel factory in Sudan to assess the production and gives three levels of productivity. The results after analysis by SPSS (statistical package for the social sciences) for questionnaires showed that there were deficiency in machinery, unsatisfactory salary, not up to date technology, materials shortage and less skilled employees. In conclusion managerial sector was found to be the most barriers facing Dubai steel factory in Sudan development. The analysis of result by SPSS showed that modifying formula used to produce steel bar has seven variations better than routinely used which had two variations, newly obtained formula had been tested three times in steel bar production process, the result was acceptable compared with routinely used in the factory after analysis the final product. This modifying formula due to its reduced cost of used amounted (silicon and manganese) alloy, less time for treatment and with high quality, is highly recommended to apply in steel bar production, strategic plan made according to data analysis to be matched with existences problems. Productivity calculations for materials, labors and machines provide levels for control the production process and also contribute to make decision in short time. Thesis

2021-07-22T00:00:00Z Adam, Abdelbagi Yusuf Abdelbagi Supervisor, -Ahmed Ibrahim Ahmed Co-Supervisor, -MuhabSalahaldenShalby https://repository.sustech.edu/handle/123456789/26728 2021-10-17T09:28:12Z 2021-07-12T00:00:00Z

Modeling and Analysis of Polypropylene Fiber Extrusion Process Adam, Abdelbagi Yusuf Abdelbagi; Supervisor, -Ahmed Ibrahim Ahmed; Co-Supervisor, -MuhabSalahaldenShalby Extrusion processes are widely used in plastic industries aiming to produce advanced solutions for increasingly sophisticated demands for plastics.Processes are not designed based on professional engineering design, but on trial and error techniques, which may complicate and/or negatively affect the extrusion processing parameters. In this study focus was concentrated on the parameters incorporated in Polypropylene Fiber extrusion process such as: screw length, screw diameter, metering zone length and flight depth. A model equations were derived based on abstracted standard equations considering the swelling occurs for the extruded fibers and the tensile drawing of fiber. Authenticated design parameters were derived and a model useful to simulate any given extrusion process successfully was resulted in a form of computer software system using C# language. The model was checked against manual calculations and gives comparable results for almost all parameters in addition to that, the model proves reliability, accuracy, high speed and integrity. Output data was useful for industrial design and operational setup and it can be further enhanced for future development and diversity conditions. Thesis

2021-07-12T00:00:00Z