Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2020
Thesis Language: Turkish
Student: HAZAL ÖZTAN
Supervisor: Özkan Murat Doğan
Abstract:Regenerating technologies, young industries that are following up new techniques, increasing human population and activities have enhanced the global energy requirement. The enhanced global energy requirement is mainly supplied with primary sources and it is known that the fossil fuels’ remaining lives are troubled. Greenhouse gas emissions of conventional energy systems and environmental issues of fossil fuel ash and heavy metals make it necessary to find alternative energy sources. Conventional coal-burning systems are known as the most common techniques to produce energy. However, coal gasification processes offer more efficient ways to produce energy due to gas products. The gas product of gasification is called syngas. It contents combustible gases CH4, CO, and H2 as an energy carrier. Syngas can be used both to burn in engines and to produce various chemicals. Nowadays, coal gasification researches are reawakened and biomass sources are being chosen as fuel. Assessing the carbon in the biomass content and supporting the H2 concentration in the synthesis gas are aimed at the gasification of biomass, while determining the gasification behavior along with the coal facilitates their evaluation as an alternative energy source. Fluidized beds have a well gas-solid interaction, homogenous temperature pattern, and flexibility of fuel condition. Because of these advantages, fluidized beds are preferred to gasification. In this master thesis, the production of syngas in a fluidized bed was studied. Tunçbilek lignite and olive kernel were used as fuel. Gasification agent was selected as steam. The effects of gasification temperature and biomass ratio in fuel mixture on H2 concentration were investigated experimentally. Synergy’s co-gasification of lignite and olive kernel was obtained. Also, the catalytic effects of alkali metal contents in olive kernel were specified. In other respects, a theoretical model was developed to estimate the effects of steam/fuel ratio and temperature on syngas composition by using Polymath program. Experimental and model results showed that the H2 concentration in syngas increased as the temperature was increased. As steam/fuel ratio was increased, H2 concentration increased, too. Also, Potassium in olive kernel affected the gasification positively