The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Rafael Kandiyoti - One of the best experts on this subject based on the ideXlab platform.
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the zero emission carbon concept zeca extents of reaction with different coals in steam hydrogen tar formation and residual char reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
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The Zero Emission Carbon Concept (ZECA): Extents of Reaction with Different Coals in Steam/Hydrogen, Tar Formation and Residual Char Reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
N Paterson - One of the best experts on this subject based on the ideXlab platform.
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the zero emission carbon concept zeca extents of reaction with different coals in steam hydrogen tar formation and residual char reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
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The Zero Emission Carbon Concept (ZECA): Extents of Reaction with Different Coals in Steam/Hydrogen, Tar Formation and Residual Char Reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
D R Dugwell - One of the best experts on this subject based on the ideXlab platform.
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the zero emission carbon concept zeca extents of reaction with different coals in steam hydrogen tar formation and residual char reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
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The Zero Emission Carbon Concept (ZECA): Extents of Reaction with Different Coals in Steam/Hydrogen, Tar Formation and Residual Char Reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
Paul S Fennell - One of the best experts on this subject based on the ideXlab platform.
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the zero emission carbon concept zeca extents of reaction with different coals in steam hydrogen tar formation and residual char reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
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The Zero Emission Carbon Concept (ZECA): Extents of Reaction with Different Coals in Steam/Hydrogen, Tar Formation and Residual Char Reactivity
Energy & Fuels, 2008Co-Authors: N Paterson, D R Dugwell, Paul S Fennell, Rafael KandiyotiAbstract:A high pressure wire mesh reactor has been modified to investigate the reactions underlying the zero emission carbon concept (ZECA) process. This is a novel power generation concept that involves producing hydrogen from coal. An earlier paper has described the concept, the wire mesh reactor used for laboratory scale tests, and results of tests with H2 and He. In this paper, results of tests with a range of coals are described, together with tar emission and char reactivity measurements. The tests with a range of coals (from Lignite through to bituminous have shown that the performances of the different fuels do vary widely, but not as a direct function of their rank. With Lignites, high conversions were achieved in a H2/steam mixture. Lower conversions were apparent with the other coals. However, reaction conditions were not optimized to achieve the highest conversion level. Pittsburgh No. 8 coal (high volatile bituminous) was also found to be reactive, whereas Wyodak (sub-bituminous) and Daw Mill (bitumi...
Alok Kumar - One of the best experts on this subject based on the ideXlab platform.
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Assessment of Thermal Maturity, Source Rock Potential and Paleodepositional Environment of the Paleogene Lignites in Barsingsar, Bikaner–Nagaur Basin, Western Rajasthan, India
Natural Resources Research, 2019Co-Authors: Alok K. Singh, Alok KumarAbstract:Investigations on the Paleogene Lignites were carried out through geochemical, mineralogical and petrographic analyses to assess their paleodepositional environment, source rock potential and thermal maturity. The samples were collected from the Barsingsar Lignite mines in the Bikaner–Nagaur Basin, Western Rajasthan, India. Huminite reflectance assigns these samples as Lignite (low-rank coal). Barsingsar Lignites are dominated by the huminite maceral group, while inertinites and liptinites occur in subordinated amount. The mineral matter is dominated by carbonates, pyrite and argillaceous (in descending order). Gelification index, tissue preservation index, groundwater index and vegetation index indicate the prevalence of a dry forest swamp having ombrotrophic to mesotrophic conditions in the paleomire. Rock–Eval pyrolysis indicates high hydrogen index relative to oxygen index and excellent hydrocarbon potential. The Barsingsar Lignites are characterized by mixed type III and type II kerogens, which are thermally immature. Several minerals like quartz, coesite, siderite, aragonite and rutile minerals have been identified by XRD analysis, whereas selected trace elements primarily Sr, Zr, Cu, Pb, Zn, Cr, V, Ni, Rb and Co were also detected. Fourier-transform infrared spectroscopy pattern shows the dominance of clay minerals and the presence of aromatic, aliphatic and some oxygen functional groups in these Lignites.
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Petro-chemical characterisation and depositional paleoenvironment of Lignite deposits of Nagaur, Western Rajasthan, India
Environmental Earth Sciences, 2017Co-Authors: Alok K. Singh, Alok KumarAbstract:The objective of this study was to know about the depositional environment and petrographic characteristics of Lignite deposits of the Nagaur district, Rajasthan, India, and to decipher source rock potential. Lignite samples have been collected from all the working and exposed Lignite seams from Matasukh Lignite mines of Nagaur following the pillar sampling method. The petrographic study has been done following the International Committee for Coal and Organic Petrology and ISO norms. The study has shown that Nagaur Lignites are mostly dominated by the huminite group of macerals followed by liptinite group. The huminite group is mainly represented by attrinite, textinite and ulminite, whereas liptinite is represented mainly by primary liptinites such as resinite, sporinite, suberinite and cutinite. An inertinite group of macerals occurs in the least concentration as compared to the huminite and liptinite group macerals and mainly represented by the semifusinite, funginite and inertodetrinite. In these Lignites, carbonate mineral matters are dominating over the pyrite and argillaceous mineral matter. The maceral constituents present in the studied samples indicate a high proportion of type III kerogen and are capable of generating gases only. Based on the reflectance of Eu-ulminite B maceral, Nagaur Lignites may be classified as ‘Low-rank B’ (Lignite B). The study reveals that Lignites originated in the bog forest under ombrotrophic to mesotrophic hydrological conditions. Gelification Index and the Tissue Preservation Index suggest an accumulation of peat in the marshy environment.