Enerji kaynağı olarak petrollerin ısısal karakterizasyonu

TÜBİTAK ÇAYDAG01.01.200

Sustainable Transportation Managing in University Campuses: The Case of Middle East Technical University

As the level of income of countries rises, sustainability-related issues are improved in general; however, problems regarding the increase in the amount of waste and carbon emissions worsen. The increasing level of wealth in both developing and developed countries, as well as cultural transformations that encourage the use of personal vehicles, threaten sustainability on a global scale. Generally, higher education institutions are places of great mobility thanks to their students, personnel, and visitors. For this reason, creating eco-friendly ways of transportation in these places is one of the most important aspects of having sustainable campuses. The reason why it is crucial is that creating a livable environment by providing sustainable transportation alternatives on campuses leads students to potentially continue with these practices in their lives afterward. Although there are various widely accepted practices of managing sustainable transportation implemented in higher education institutions, it is of great importance for these institutions to conduct a comprehensive situation analysis first so that their sustainable transportation policies can be shaped correctly. In this way, it can be possible for the universities to evaluate their current situations thoroughly and thus implement their own practices in accordance with their conditions. This study endeavors to examine the issue of eco-friendly transportation for sustainable campuses, evaluate the practices of Middle East Technical University in this respect, and raise suggestions for higher education institutions.Keyword: Sustainability, Transportation Management, University Campu

Ağır petrol-linyit / bitümlü şist karışımlarının yanma etkilerinin belirlenmesi ve alternatif enerji kaynağı olarak kullanabilirliğinin araştırılması

TÜBİTAK TBAG Proje01.05.201

Characterization of medium and heavy crude oils using thermal analysis techniques

This study focused on the characterization of heavy and medium grade crude oils in limestone matrix using differential scanning calorimeter (DSC) and thermogravimetry (TG-DTG). DSC and TG-DTG curves produced for two different crude oils + limestone mixtures indicate that the crude oil undergoes two major transitions when subjected to an oxidizing and constant rate environment known as low- and high-temperature oxidation. Kinetic analysis in the low- and high-temperature oxidation regions were performed using two different kinetic methods. Throughout the study. it was observed that the activation energy values of the samples are varied between 2.40-10.62 and 42.3-181.9 kJ/mol in low- and high-temperature oxidation regions respectively

Geological Considerations for the Economic Evaluation of Turkish Oil Shale Deposits and Their Combustion-Pyrolysis Behavior

The oil shale deposits in Turkey are widely distributed in middle and western Anatolia. Turkish oil shales are of Palaeocene-Eocene and middle upper Miocene age. Current reserves of oil shales are approximately 2,220 million tons (total reserve) and mainly are located in Himmetoglu, Seyitomer, Beypazari, and Hatildag deposits. Some petrological, geochemical, Fisher Assay, and fluidized combustion tests are performed for these oil shale fields, and it was concluded that Himmetoglu oil shale is the most appropriate for domestic and industrial utilization. On the other hand, differential scanning calorimetry-pressurized (DSC-PDSC) and thermogravimetry (TG/DTG) experiments were performed with these oil shale samples. In pyrolysis experiments, oil shale samples showed one exothermic effect at each total pressure studied. A general trend to decreasing in activation energy with increasing pressure in pyrolysis, and increasing in activation energy with increasing pressure was observed in combustion experiments

Thermal Characterization and Model Free Kinetic Application on a Tar Sand Sample

In the first part of this research, kinetic software was developed for the evaluation of kinetic parameters using nonisothermal thermogravimetry data. Different computational methods were used and applied to a set of experimental and simulated data distributed in the ICTAC (International Confederation for Thermal Analysis and Calorimetry) kinetics project. The reliability of the software was verified by comparing the kinetic results and it was observed that the results were in good agreement. In the second part, developed software was applied to determine the kinetics of a tar sand sample. Therefore, experiments were performed at three different heating rates, in the temperature range of 20-900 degrees C. Different stages of mass loss regions were observed in TG-DTG curves. Ozawa-Flynn-Wall (OFW), Kissinger, and Augis-Bennett kinetic models were used to determine the activation energy of tar sand sample and the results are discussed

DSC and TGA investigation of combustion kinetics for crude oil-lignite mixtures

Ph.D. - Doctoral Progra

Non-isothermal kinetic analysis and feasibilty study of medium grade crude oil field

In this research, non-isothermal kinetics and feasibility study of medium grade crude oil is studied in the presence of a limestone matrix. Experiments were performed at a heating rate of 10 degrees C min(-1), whereas the air flow rate was kept constant at 50 mL min(-1) in the temperature range of 20 to 600 degrees C (DSC) and 20 to 900 degrees C (TG). In combustion with air, three distinct reaction regions were identified in all crude oil/limestone mixtures, known as low temperature oxidation (LTO), fuel deposition (FD) and high temperature oxidation (HTO). The activation energy values were in the order of 5-9 kJ mol(-1) in LTO region and 189-229 kJ mol(-1) in HTO region. It was concluded that the medium grade crude oil field was not feasible for a self-sustained combustion process