Yazar "Tolay, Mustafa" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Co-gasification of Turkish lignite and three plastic wastes in a lab-scale updraft gasifier: case-study equilibrium (gibbs free energy), openfoam CFD, analytical validation, and experimental-range benchmarking
    (Elsevier, 2025) Koyunoglu, Cemil; Tolay, Mustafa
    This study investigates the co-gasification of lignite and plastic waste with the aim of producing hydrogen-rich syngas while simultaneously addressing waste utilization challenges. A comparative modeling framework was developed by integrating one-dimensional analytical calculations (1D), Gibbs free energy minimization (GEM), and computational fluid dynamics (CFD) using OpenFOAM. The results demonstrated that blending plastics with lignite enhanced hydrogen yield and syngas quality, with a 20 % plastic fraction identified as the optimum operating condition. The authors validate the modeling framework using literature-based experimental data, with deviations normally within +/- 10 %. The results demonstrate not just the technological viability of cogasification, but also their real-world implications for sustainable hydrogen production and waste-to-energy applications and represent a cleaner alternative to straight combustion.
  • Küçük Resim Yok
    Öğe
    Kinetic Analysis and Simulation of Rice Husk Char Gasification in H2O and CO2 Atmospheres for Enhanced Syngas Production
    (Springer Science and Business Media Deutschland GmbH, 2025) Koyunoğlu, Cemil; Tolay, Mustafa
    This chapter presents an extended analysis of the gasification kinetics of rice husk char in H2O and CO2 atmospheres, emphasizing enhanced syngas production for sustainable energy applications. Building upon initial findings presented at the 14th International Exergy, Energy and Environment Symposium (IEEES-14), this study incorporates additional experimental data and advanced simulation techniques to offer a deeper understanding of the process dynamics and efficiency improvements. New kinetic models are introduced, which better account for the variable behaviors of reactants under different operational conditions, thereby providing a more accurate prediction of the gasification process. The results underscore the potential of rice husk as a viable and sustainable feedstock for syngas production, contributing to the reduction of waste and enhancement of renewable energy sources. This chapter also discusses the environmental and economic impacts of utilizing agricultural residues in energy production, aligning with global sustainability goals. Through comprehensive analysis and simulation, the study demonstrates significant advancements in the optimization of gasification processes, thereby supporting the development of more efficient and cleaner energy technologies. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.
  • Küçük Resim Yok
    Öğe
    Polymer Fractionation by Automated Laboratory System with Laser Optical Probe (L.A.F.P.)
    (Turkish Chemical Society, 2022) Tolay, Mustafa; Koyunoğlu, Cemil; Cinquina, Patrizia
    By examining the composition of copolymers and the distribution of their molecular weights, one can get an idea about their various properties. It is necessary to obtain homogeneous samples from fractions of different molecular weights of copolymers. Fractionation processes are quite difficult and time consuming. In this study, a type of ethylene-propylene copolymer was fractionated depending on molecular weight with a system based on laser turbidity measurement. The copolymer was dissolved in diphenylmethane at a certain temperature. The temperature of the system and the adjustment of other parameters are made with the developed computer-controlled system. When the temperature of the solution was lowered slowly and in a controlled manner, the separation of fractions with certain molecular weights could be achieved. The solution turbidity formed during the separation was measured and controlled by the developed laser system. Molecular weights, viscosities and IR analyses of the copolymer and its fractions were tried to find the properties of the fractions.