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G Atesok - One of the best experts on this subject based on the ideXlab platform.
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effect of Coal Particle size distribution volume fraction and rank on the rheology of Coal water slurries
Fuel Processing Technology, 2004Co-Authors: Feridun Boylu, H Dincer, G AtesokAbstract:AbstractThe aim of this study was to understanding of the effect of Coal Particle size distributions onrheology of Coal–water slurries (CWS). Experiments have been carried out on the Coal samples thatwere different in rank. Besides two different Turkish lignites (Soma and Istanbul–Agacli), abituminous Coal from Siberia (Russia) has been used. In addition to the determination of thechemical and physical properties of the Coal samples, their zeta potentials were also measured. Thepulps of different solids percentage composed of Coal Particles with d 50 sizes of 19, 35 and 50 Amwere used to determine the effect of volume fraction on the viscosity of the slurry.D 2003 Elsevier B.V. All rights reserved. Keywords: Coal; Coal–water slurries; Viscosity; Fuel; Solid waste; Energy 1. IntroductionCoal–water slurries (CWS) developed as a new alternative to fuel has opened newavenues in the utilisation of Coal fines that can avoid prohibitive cost of dewatering.A typical CWS consists of 60–75% Coal, 25–40% water and about 1% chemicaladditives. The effects of a number of variables, such as the properties of the Coal, theParticle sizes and their distribution, the type and the amount of chemical additives, themethod of preparation of the slurry and the effect of its rheological properties on thebehaviour of CWS are very important [1,2].
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effect of Coal Particle size distribution volume fraction and rank on the rheology of Coal water slurries
Fuel Processing Technology, 2004Co-Authors: Feridun Boylu, H Dincer, G AtesokAbstract:AbstractThe aim of this study was to understanding of the effect of Coal Particle size distributions onrheology of Coal–water slurries (CWS). Experiments have been carried out on the Coal samples thatwere different in rank. Besides two different Turkish lignites (Soma and Istanbul–Agacli), abituminous Coal from Siberia (Russia) has been used. In addition to the determination of thechemical and physical properties of the Coal samples, their zeta potentials were also measured. Thepulps of different solids percentage composed of Coal Particles with d 50 sizes of 19, 35 and 50 Amwere used to determine the effect of volume fraction on the viscosity of the slurry.D 2003 Elsevier B.V. All rights reserved. Keywords: Coal; Coal–water slurries; Viscosity; Fuel; Solid waste; Energy 1. IntroductionCoal–water slurries (CWS) developed as a new alternative to fuel has opened newavenues in the utilisation of Coal fines that can avoid prohibitive cost of dewatering.A typical CWS consists of 60–75% Coal, 25–40% water and about 1% chemicaladditives. The effects of a number of variables, such as the properties of the Coal, theParticle sizes and their distribution, the type and the amount of chemical additives, themethod of preparation of the slurry and the effect of its rheological properties on thebehaviour of CWS are very important [1,2].
Xiumin Jiang - One of the best experts on this subject based on the ideXlab platform.
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morphological characterization of super fine pulverized Coal Particle part 2 afm investigation of single Coal Particle
Fuel, 2010Co-Authors: Xiumin Jiang, Xiangyong Huang, Shaohua WuAbstract:Super fine pulverized Coal combustion is a new pulverized Coal combustion technology which has better stability, higher combustion efficiency and lower NOx and SO2 emission than that using conventional Particle sizes. In this paper we applied fractal analysis based on power spectral density (PSD) and slit island method (SIM), three-dimensional (3D) surface roughness measurement and surface-topography observations from AFM to form a proper investigative tool which may give a relatively full picture of surface morphology of super fine pulverized Coal Particles for the first time. The final results indicate that both fractal dimensions calculated by SIM and PSD and roughness of Coal Particle size increase with the increase of the Coal Particle size. Besides, the grey relational analysis was used to study the degree of relative importance of the influential factors about the microroughness of Coal Particle surfaces. The results show that the influence of the Coal Particle size is the greatest compared with the Coal qualities and fractal dimensions. This work provides some reference for a relatively full picture of surface morphology of super fine pulverized Coal Particles. The findings from this work will be helpful to form the basis and provide guidance for further studies on the chemical and combustion characteristics of super fine pulverized Coal Particles.
Shaohua Wu - One of the best experts on this subject based on the ideXlab platform.
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morphological characterization of super fine pulverized Coal Particle part 2 afm investigation of single Coal Particle
Fuel, 2010Co-Authors: Xiumin Jiang, Xiangyong Huang, Shaohua WuAbstract:Super fine pulverized Coal combustion is a new pulverized Coal combustion technology which has better stability, higher combustion efficiency and lower NOx and SO2 emission than that using conventional Particle sizes. In this paper we applied fractal analysis based on power spectral density (PSD) and slit island method (SIM), three-dimensional (3D) surface roughness measurement and surface-topography observations from AFM to form a proper investigative tool which may give a relatively full picture of surface morphology of super fine pulverized Coal Particles for the first time. The final results indicate that both fractal dimensions calculated by SIM and PSD and roughness of Coal Particle size increase with the increase of the Coal Particle size. Besides, the grey relational analysis was used to study the degree of relative importance of the influential factors about the microroughness of Coal Particle surfaces. The results show that the influence of the Coal Particle size is the greatest compared with the Coal qualities and fractal dimensions. This work provides some reference for a relatively full picture of surface morphology of super fine pulverized Coal Particles. The findings from this work will be helpful to form the basis and provide guidance for further studies on the chemical and combustion characteristics of super fine pulverized Coal Particles.
Feridun Boylu - One of the best experts on this subject based on the ideXlab platform.
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effect of Coal Particle size distribution volume fraction and rank on the rheology of Coal water slurries
Fuel Processing Technology, 2004Co-Authors: Feridun Boylu, H Dincer, G AtesokAbstract:AbstractThe aim of this study was to understanding of the effect of Coal Particle size distributions onrheology of Coal–water slurries (CWS). Experiments have been carried out on the Coal samples thatwere different in rank. Besides two different Turkish lignites (Soma and Istanbul–Agacli), abituminous Coal from Siberia (Russia) has been used. In addition to the determination of thechemical and physical properties of the Coal samples, their zeta potentials were also measured. Thepulps of different solids percentage composed of Coal Particles with d 50 sizes of 19, 35 and 50 Amwere used to determine the effect of volume fraction on the viscosity of the slurry.D 2003 Elsevier B.V. All rights reserved. Keywords: Coal; Coal–water slurries; Viscosity; Fuel; Solid waste; Energy 1. IntroductionCoal–water slurries (CWS) developed as a new alternative to fuel has opened newavenues in the utilisation of Coal fines that can avoid prohibitive cost of dewatering.A typical CWS consists of 60–75% Coal, 25–40% water and about 1% chemicaladditives. The effects of a number of variables, such as the properties of the Coal, theParticle sizes and their distribution, the type and the amount of chemical additives, themethod of preparation of the slurry and the effect of its rheological properties on thebehaviour of CWS are very important [1,2].
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effect of Coal Particle size distribution volume fraction and rank on the rheology of Coal water slurries
Fuel Processing Technology, 2004Co-Authors: Feridun Boylu, H Dincer, G AtesokAbstract:AbstractThe aim of this study was to understanding of the effect of Coal Particle size distributions onrheology of Coal–water slurries (CWS). Experiments have been carried out on the Coal samples thatwere different in rank. Besides two different Turkish lignites (Soma and Istanbul–Agacli), abituminous Coal from Siberia (Russia) has been used. In addition to the determination of thechemical and physical properties of the Coal samples, their zeta potentials were also measured. Thepulps of different solids percentage composed of Coal Particles with d 50 sizes of 19, 35 and 50 Amwere used to determine the effect of volume fraction on the viscosity of the slurry.D 2003 Elsevier B.V. All rights reserved. Keywords: Coal; Coal–water slurries; Viscosity; Fuel; Solid waste; Energy 1. IntroductionCoal–water slurries (CWS) developed as a new alternative to fuel has opened newavenues in the utilisation of Coal fines that can avoid prohibitive cost of dewatering.A typical CWS consists of 60–75% Coal, 25–40% water and about 1% chemicaladditives. The effects of a number of variables, such as the properties of the Coal, theParticle sizes and their distribution, the type and the amount of chemical additives, themethod of preparation of the slurry and the effect of its rheological properties on thebehaviour of CWS are very important [1,2].
Tata Sutardi - One of the best experts on this subject based on the ideXlab platform.
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Investigation of thermochemical process of Coal Particle packed bed reactions for the development of UCG
International Journal of Coal Science & Technology, 2020Co-Authors: Tata Sutardi, Nader Karimi, Linwei Wang, Manosh C PaulAbstract:In this study, a packed bed reactor was developed to investigate the gasification process of Coal Particles. The effects of Coal Particle size and heater temperature of reactor were examined to identify the thermochemical processes through the packed bed. Three different Coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the packed bed with smaller Coal size has higher temperature, reaching 624 °C, 582 °C, and 569 °C for Coal A, B, and C, respectively. In the case of CO formation, the smaller Particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the packed bed due to different Coal Particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the Coal packed bed formed by the smallest Particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of Coal seam porosity in underground Coal gasification application, as well as temperature to promote the syngas productions.
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Investigation of thermochemical process of Coal Particle packed bed reactions for the development of UCG
2020Co-Authors: Tata Sutardi, Nader Karimi, Linwei Wang, Manosh C PaulAbstract:Abstract In this study, a packed bed reactor is developed to investigate the gasification process of Coal Particles. The effects of Coal Particle size and heater temperature of reactor are examined to identify the thermochemical processes through the packed bed. Three different Coal samples with varying size, named as A, B, and C, are used, and the experimental results show that the packed bed with smaller Coal size has higher temperature, reaching 624oC, 582oC, and 569oC for Coal A, B, and C respectively. In the case of CO formation, the smaller Particle size has greater products in the unit of mole fraction over the area of generation. However, the variation in the porosity of the packed bed due to different Coal Particle sizes affects the reactions through the oxygen access. Consequently, the CO formation is least from the Coal packed bed formed by the smallest Particle size A. A second test with the temperature variations shows that the higher heater temperature promotes the chemical reactions, resulting in the increased gas products. The findings indicate the important role of Coal seam porosity in UCG (underground Coal gasification) application, as well as temperature to promote the syngas productions.
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Numerical Study of the Effects of CO2 Addition in Single Coal Particle Gasification
Energy Procedia, 2017Co-Authors: Tata Sutardi, Nader Karimi, Manosh C Paul, Paul L. YoungerAbstract:Abstract Gasification appears to be the way of processing and utilizing Coal cleanly. However, currently the main issue of Coal utilization is CO 2 production that adversely impacts the environmental sustainability of this process. Some efforts have been made to control and reduce the CO 2 emission in the atmosphere, such as using CCS (Carbon Captured and Storage) or CCU (Carbon Captured and Utilization). As a part of those efforts, this work investigates the effect of utilizing CO 2 in the gasification process. Towards this aim, numerical simulations of single Coal Particle gasification are conducted. The benefits of adding CO 2 to the gasification process compared to that of air are examined thoroughly. It is found that H 2 , CO and CH 4 productions are increased with CO 2 addition thus indicating an improvement in syngas generation from the Coal gasification.
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Numerical Modelling for Process Investigation of a Single Coal Particle Combustion and Gasification
2017Co-Authors: Tata Sutardi, Nader Karimi, Manosh C Paul, Paul L. YoungerAbstract:Combustion and Gasification are commercial processes of Coal utilization, and therefore continuous improvement is needed for these applications. The difference between these processes is the reaction mechanism, in the case of combustion the reaction products are CO2 and H2O, whereas in the case of gasification the products are CO, H2 and CH4. In order to investigate these processes further, a single Coal Particle model has been developed. The definition of the chemical reactions for each process is key for model development. The developed numerical model simulation uses CFD (Computational Fluid Dynamic) techniques with an Eddy Break Up (EBU) model and a kinetics parameter for controlling the process reaction. The combustion model has been validated and extended to model the gasification process by inclusion of an additional chemical reaction. Finally, it is shown that the single Coal Particle model could describe single Coal Particle combustion and gasification. From the result, the difference between single Coal Particle combustion and gasification can clearly be seen. This simulation model can be considered for further investigation of Coal combustion and gasification application processes.
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Identifying Kinetic Parameters for Char Combustion of a Single Coal Particle
2017Co-Authors: Tata Sutardi, Nader Karimi, Manosh C Paul, Paul L. YoungerAbstract:A Coal Particle model is developed with an aim to identify the suitable kinetic reaction properties which lead to a better prediction of char combustion. Eddy Break Up with kinetic control model is used as a simulation technique and applied to bituminous Coal as representation in the simulation model. Seven reactions for the Coal combustion are considered and some of the Coal Particle combustion experimental results are taken from literature in order to validate the simulation model. The results show how the behavior of char reaction is influenced with varying kinetic properties. The variation of the pre exponential factor (A) and temperature exponent (β) in the reaction properties affect the temperature and the burn out time of the single Coal Particle combustion. Ultimately, a set of kinetic reaction values are discovered that gives good agreement for the Particle temperature and burn out time behavior when compared with experimental data.