Browsing by Author "Gungor, Afsin"
Now showing items 1-19 of 19
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Analysis of combustion efficiency in CFB coal combustors
Gungor, Afsin (ELSEVIER SCI LTD, 2008)Fluidized bed technology is well known for its high combustion efficiency and is widely used in coal combustion. In this study, the combustor efficiency has been defined and investigated for CFB coal combustor based on the ... -
Determining the best model for estimation the monthly mean daily global solar radiation on a horizontal surface - A case study in Nigde, Turkey
Gungor, Afsin; Gokcek, Murat; Yalcin, Fusun; Kocer, Abdulkadir; Yaka, Ismet Faruk; Sardogan, Gozde Tugce (EMERALD GROUP PUBLISHING LTD, 2015)Knowledge of the local solar radiation is important for many applications of solar energy systems. The global solar radiation on horizontal surface at the location of interest is the most critical input parameter employed ... -
Effects of operational parameters on emission performance and combustion efficiency in small-scale CFBCs
Gungor, Afsin; Eskin, Nurdil (CHINESE INST CHEMICAL ENGINEER, 2008)A well-designed CFBC can burn coal with high efficiency and within acceptable levels of gaseous emission. In this theoretical study effects of operational parameters on combustion efficiency and the pollutants emitted have ... -
Effects of operational parameters on the thermodynamic performance of FBCC steam power plant
Eskin, Nurdil; Gungor, Afsin; Ozdemir, Koray (ELSEVIER SCI LTD, 2009)In this study, the effects of operational parameters on the thermodynamic performance of a FBCC steam power plant with a rated output of 7.7 MW are investigated by the developed model such as excess air, coal type and steam ... -
Exergy analysis of Eregli sugar factory
Sahin, Necmettin; Kaplan, Erkan; Bayrak, Mustafa; Yaka, I. Faruk; Gungor, Afsin (EMERALD GROUP PUBLISHING LTD, 2015)Progressive decline in world energy resources, rising costs, on behalf of the various studies has led businesses to use energy resources efficiently. This work is at the top of the exergy analysis. In this study, using ... -
Fossil fuel sustainability: Exergy assessment of a cogeneration system
Bayrak, Mustafa; Gungor, Afsin (JOHN WILEY & SONS LTD, 2011)Thermodynamics plays an important role to perform the energy and exergy analyses of the industrial processes. The first law is widely used in engineering practice and is the basis of the heat-balance method of analysis ... -
In view of sustainable future energetic-exergetic and economic analysis of a natural gas cogeneration plant
Gungor, Afsin; Bayrak, Mustafa; Beylergil, Bertan (INDERSCIENCE ENTERPRISES LTD, 2013)Thermodynamics plays an important role in performing energy and exergy analyses of industrial processes. The first law is widely used in engineering practice, and is the basis of the heat-balance method of analysis that ... -
Modeling the effects of the operational parameters on H-2 composition in a biomass fluidized bed gasifier
Gungor, Afsin (PERGAMON-ELSEVIER SCIENCE LTD, 2011)In this study, effects of the operational parameters such as gasifier temperature, bed operational velocity, equivalence ratio, biomass particle size and biomass-to-steam ratio on hydrogen production from an atmospheric ... -
Numerical Simulation of Nano Particles in a Fluidized Bed
Gungor, Afsin (AMER SCIENTIFIC PUBLISHERS, 2011)In this study, two dimensional numerical model is developed to simulate the hydrodynamic characteristics of nano particles such as the solids fraction and bed pressure drop in a fluidized bed. The model results are compared ... -
One dimensional numerical simulation of small scale CFB combustors
Gungor, Afsin (PERGAMON-ELSEVIER SCIENCE LTD, 2009)In this study, a one-dimensional model which includes volatilization, attrition and combustion of char particles for a circulating fluidized bed (CFB) combustor has been developed. In the modeling, the CFB combustor is ... -
Predicting axial pressure profile of a CFB
Gungor, Afsin (ELSEVIER SCIENCE SA, 2008)The numerical simulation of CFBs is an important tool in the prediction of its flow behavior. Predicting the axial pressure profile is one of the major difficulties in modeling a CFB. A model using a Particle Based Approach ... -
Prediction of SO2 and NOx emissions for low-grade Turkish lignites in CFB combustors
Gungor, Afsin (ELSEVIER SCIENCE SA, 2009)The CFB technology is widely used for combustion of coal because of its unique ability to handle low quality. high ash, high sulphur and low heating value coals. This paper presents a modeling study of pollutant emissions ... -
Second law analysis of heat transfer surfaces in circulating fluidized beds
Gungor, Afsin (ELSEVIER SCI LTD, 2009)The correct sizing of the heat transfer surfaces is important to ensure proper operation, load turndown, and optimization of circulating fluidized beds (CFBs). From this point of view, in this study, the thermodynamic ... -
Simulation of bed-to-wall heat transfer in circulating fluidized beds
Gungor, Afsin (TURKISH SOC THERMAL SCIENCES TECHNOLOGY, 2008)In this study, the numerical simulation of bed-to-wall heat transfer in CFBs is presented which based on previously developed 2D CFB model which uses the particle-based approach and integrates and simultaneously predicts ... -
Simulation of emission performance and combustion efficiency in biomass fired circulating fluidized bed combustors
Gungor, Afsin (PERGAMON-ELSEVIER SCIENCE LTD, 2010)In this study, the combustion efficiency and the emission performance of biomass fired CFBs are tested via a previously published 2D model [Gungor A. Two-dimensional biomass combustion modeling of CFB. Fuel 2008; 87: ... -
Simulation of NOx Emission in Circulating Fluidized Beds Burning Low-grade Fuels
Gungor, Afsin (AMER CHEMICAL SOC, 2009)Nitrogen oxides are a major environmental pollutant resulting from combustion. This paper presents a modeling study of pollutant NOx emission resulting from low-grade fuel combustion in a circulating fluidized bed. The ... -
A study on the effects of operational parameters on bed-to-wall heat transfer
Gungor, Afsin (PERGAMON-ELSEVIER SCIENCE LTD, 2009)In this study the effects of operational parameters on bed-to-wall heat transfer in CFBs are investigated such as solids volume fraction, particle diameter, suspension density, solid circulation rate. Based on a previously ... -
Thermodynamic analysis of a FBCC steam power plant
Eskin, Nurdil; Gungor, Afsin; Ozdemir, Koray (PERGAMON-ELSEVIER SCIENCE LTD, 2009)This article presents the analysis of first and second laws of thermodynamics in a 7.7 MW steam power plant located in Torbali (Izmir, Turkey). it involves a fluidized bed, a waste heat boiler (WHB) and an economizer as ... -
Two-dimensional biomass combustion modeling of CFB
Gungor, Afsin (ELSEVIER SCI LTD, 2008)In this study, a 2D model for a CFB biomass combustor has been developed which integrates and simultaneously predicts the hydrodynamics, heat transfer and combustion aspects. Combustor hydrodynamic is modeled taking into ...