The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
T F Wall - One of the best experts on this subject based on the ideXlab platform.
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pyrolysis and combustion characteristics of an indonesian low rank Coal under o2 n2 and o2 co2 conditions
Energy & Fuels, 2010Co-Authors: Xianchun Li, Jianglong Yu, T F Wall, Renu Kumar Rathnam, Qi Wang, Chatphol MeesriAbstract:Pyrolysis and combustion characteristics of an Indonesian low-rank Coal are studied under oxy-fuel (O2/CO2) and air (O2/N2) conditions using a drop tube furnace (DTF) and a thermogravimetric analyzer (TGA). Raw Coal, dried Coal, and binderless briquette samples of the same Coal were used in the experiments, and the effects of drying and binderless briquetting on the Reactivity of the Coal under different conditions were investigated. Chars were prepared in the DTF in both N2 and CO2 atmospheres in the temperature range of 800−1400 °C. The Reactivity of chars under oxy-fuel and air conditions was analyzed in the TGA. The Coal Reactivity under oxy-fuel conditions differed from that under air combustion conditions. The temperature at which significant gasification of the Coal and char took place in the concentrated CO2 gas stream was also identified. Characteristics of chars from different conditions were compared. Drying and briquetting had some noticeable influences on the Reactivity of the Coal under oxy-...
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an overview on oxyfuel Coal combustion state of the art research and technology development
Chemical Engineering Research & Design, 2009Co-Authors: T F Wall, Chris Spero, Liza Elliott, S Khare, Renu Kumar Rathnam, Farida Zeenathal, Behdad Moghtaderi, Bart J P Buhre, Changdong Sheng, Raj GuptaAbstract:Oxyfuel combustion is seen as one of the major options for CO2 capture for future clean Coal technologies. The paper provides an overview on research activities and technology development through a fundamental research underpinning the Australia/Japan Oxyfuel Feasibility Project. Studies on oxyfuel combustion on a pilot-scale furnace and a laboratory scale drop tube furnace are presented and compared with computational fluid dynamics (CFD) predictions. The research has made several contributions to current knowledge, including; comprehensive assessment on oxyfuel combustion in a pilot-scale oxyfuel furnace, modifying the design criterion for an oxy retrofit by matching heat transfer, a new 4-grey gas model which accurately predicts emissivity of the gases in oxy-fired furnaces has been developed for furnace modelling, the first measurements of Coal Reactivity comparisons in air and oxyfuel at laboratory and pilot-scale; and predictions of observed delays in flame ignition in oxy-firing.
Renu Kumar Rathnam - One of the best experts on this subject based on the ideXlab platform.
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pyrolysis and combustion characteristics of an indonesian low rank Coal under o2 n2 and o2 co2 conditions
Energy & Fuels, 2010Co-Authors: Xianchun Li, Jianglong Yu, T F Wall, Renu Kumar Rathnam, Qi Wang, Chatphol MeesriAbstract:Pyrolysis and combustion characteristics of an Indonesian low-rank Coal are studied under oxy-fuel (O2/CO2) and air (O2/N2) conditions using a drop tube furnace (DTF) and a thermogravimetric analyzer (TGA). Raw Coal, dried Coal, and binderless briquette samples of the same Coal were used in the experiments, and the effects of drying and binderless briquetting on the Reactivity of the Coal under different conditions were investigated. Chars were prepared in the DTF in both N2 and CO2 atmospheres in the temperature range of 800−1400 °C. The Reactivity of chars under oxy-fuel and air conditions was analyzed in the TGA. The Coal Reactivity under oxy-fuel conditions differed from that under air combustion conditions. The temperature at which significant gasification of the Coal and char took place in the concentrated CO2 gas stream was also identified. Characteristics of chars from different conditions were compared. Drying and briquetting had some noticeable influences on the Reactivity of the Coal under oxy-...
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Pyrolysis and Combustion Characteristics of an Indonesian Low-Rank Coal under O2/N2 and O2/CO2 Conditions†
Energy & Fuels, 2010Co-Authors: Xianchun Li, Jianglong Yu, Renu Kumar Rathnam, Terry Wall, Qi Wang, Chatphol MeesriAbstract:Pyrolysis and combustion characteristics of an Indonesian low-rank Coal are studied under oxy-fuel (O2/CO2) and air (O2/N2) conditions using a drop tube furnace (DTF) and a thermogravimetric analyzer (TGA). Raw Coal, dried Coal, and binderless briquette samples of the same Coal were used in the experiments, and the effects of drying and binderless briquetting on the Reactivity of the Coal under different conditions were investigated. Chars were prepared in the DTF in both N2 and CO2 atmospheres in the temperature range of 800−1400 °C. The Reactivity of chars under oxy-fuel and air conditions was analyzed in the TGA. The Coal Reactivity under oxy-fuel conditions differed from that under air combustion conditions. The temperature at which significant gasification of the Coal and char took place in the concentrated CO2 gas stream was also identified. Characteristics of chars from different conditions were compared. Drying and briquetting had some noticeable influences on the Reactivity of the Coal under oxy-...
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an overview on oxyfuel Coal combustion state of the art research and technology development
Chemical Engineering Research & Design, 2009Co-Authors: T F Wall, Chris Spero, Liza Elliott, S Khare, Renu Kumar Rathnam, Farida Zeenathal, Behdad Moghtaderi, Bart J P Buhre, Changdong Sheng, Raj GuptaAbstract:Oxyfuel combustion is seen as one of the major options for CO2 capture for future clean Coal technologies. The paper provides an overview on research activities and technology development through a fundamental research underpinning the Australia/Japan Oxyfuel Feasibility Project. Studies on oxyfuel combustion on a pilot-scale furnace and a laboratory scale drop tube furnace are presented and compared with computational fluid dynamics (CFD) predictions. The research has made several contributions to current knowledge, including; comprehensive assessment on oxyfuel combustion in a pilot-scale oxyfuel furnace, modifying the design criterion for an oxy retrofit by matching heat transfer, a new 4-grey gas model which accurately predicts emissivity of the gases in oxy-fired furnaces has been developed for furnace modelling, the first measurements of Coal Reactivity comparisons in air and oxyfuel at laboratory and pilot-scale; and predictions of observed delays in flame ignition in oxy-firing.
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An overview on oxyfuel Coal combustion—State of the art research and technology development
Chemical Engineering Research & Design, 2009Co-Authors: Terry Wall, Chris Spero, Liza Elliott, S Khare, Renu Kumar Rathnam, Farida Zeenathal, Behdad Moghtaderi, Bart J P Buhre, Changdong ShengAbstract:Oxyfuel combustion is seen as one of the major options for CO2 capture for future clean Coal technologies. The paper provides an overview on research activities and technology development through a fundamental research underpinning the Australia/Japan Oxyfuel Feasibility Project. Studies on oxyfuel combustion on a pilot-scale furnace and a laboratory scale drop tube furnace are presented and compared with computational fluid dynamics (CFD) predictions. The research has made several contributions to current knowledge, including; comprehensive assessment on oxyfuel combustion in a pilot-scale oxyfuel furnace, modifying the design criterion for an oxy retrofit by matching heat transfer, a new 4-grey gas model which accurately predicts emissivity of the gases in oxy-fired furnaces has been developed for furnace modelling, the first measurements of Coal Reactivity comparisons in air and oxyfuel at laboratory and pilot-scale; and predictions of observed delays in flame ignition in oxy-firing.
Raj Gupta - One of the best experts on this subject based on the ideXlab platform.
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an overview on oxyfuel Coal combustion state of the art research and technology development
Chemical Engineering Research & Design, 2009Co-Authors: T F Wall, Chris Spero, Liza Elliott, S Khare, Renu Kumar Rathnam, Farida Zeenathal, Behdad Moghtaderi, Bart J P Buhre, Changdong Sheng, Raj GuptaAbstract:Oxyfuel combustion is seen as one of the major options for CO2 capture for future clean Coal technologies. The paper provides an overview on research activities and technology development through a fundamental research underpinning the Australia/Japan Oxyfuel Feasibility Project. Studies on oxyfuel combustion on a pilot-scale furnace and a laboratory scale drop tube furnace are presented and compared with computational fluid dynamics (CFD) predictions. The research has made several contributions to current knowledge, including; comprehensive assessment on oxyfuel combustion in a pilot-scale oxyfuel furnace, modifying the design criterion for an oxy retrofit by matching heat transfer, a new 4-grey gas model which accurately predicts emissivity of the gases in oxy-fired furnaces has been developed for furnace modelling, the first measurements of Coal Reactivity comparisons in air and oxyfuel at laboratory and pilot-scale; and predictions of observed delays in flame ignition in oxy-firing.
J E Oakey - One of the best experts on this subject based on the ideXlab platform.
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volatilization of mercury arsenic and selenium during underground Coal gasification
Fuel, 2006Co-Authors: Yongtao Wang, Li Yu, J E OakeyAbstract:Mercury, arsenic and selenium are trace elements well-known for their high volatility in underground Coal gasification (UCG) which can lead to environmental and technical problems during gas utilization. In this paper, the volatilization of mercury, arsenic and selenium from Coal in a seam during the process of UCG were investigated, based on comparison of their volatility during the transformation of Coal to char and the conversion of char to ash. Three types of Coal were involved in this study. The results indicate that the volatility of mercury, arsenic and selenium during UCG in the seam follows the sequence of Hg>Se>As. Mercury and selenium show volatility higher than 90% from Coal to ash. The volatility of arsenic is lower than 60% as confirmed by arsenic enrichment in UCG ash. Arsenic volatilization during UCG is also enhanced by increasing temperature, which is different from the result during the combustion of crushed Coal. Coal type has obvious effect on element volatilization. The higher the Coal Reactivity, the easier is the evaporation of the elements from Coal in the seam. At the same time, thermodynamic equilibrium calculations using MTDATA program were performed to predict the possible species in UCG gas. With regard to UCG gas at the production well, mercury presents as Hg(g), H2Se(g) is the main gaseous species of selenium, whereas arsenic occurs in condensed phase as As2S3 and As. The effect of the pressure on the equilibrium composition of the gas results in major changes of the proportions of the species. High pressure leads to the formation and enhancement of the reduced species and increases the condensation temperature of the volatile elements.
D.a. Netzel - One of the best experts on this subject based on the ideXlab platform.
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The use of solid-state NMR techniques for the analysis of water in Coal and the effect of different Coal drying techniques on the structure and Reactivity of Coal; Quarterly report, September 1--November 30, 1993
1993Co-Authors: D.a. NetzelAbstract:For the research program reported here, different methods of drying are being investigated to determine if drying can be accomplished without destroying Coal Reactivity toward liquefaction. In an effort to understand the mechanism of water for enhancing Coal liquefaction yield, the reactions of D{sub 2}O with the molecular constituents of Coal during Coal liquefaction are being investigated. This study involves the use of solution-state deuterium NMR, as well as, conventional solution-state {sup 1}H and {sup 13}C NMR analyses of the Coal, and the Coal liquids and residue from a Coal liquefaction process. These D{sub 2}O transfer reactions will be conducted on Coals which have been dried by various methods and rehydrated using D{sub 2}O and by successive exchange of H{sub 2}O associated with the Coals with D{sub 2}O. The drying methods include thermal, microwave, and chemical dehydration of the Coal. The overall objectives of this study are to develop a nuclear magnetic resonance (NMR) method for measuring the water in Coal, to measure the changes in Coal structure that occur during Coal drying, to determine what effect water has on retrograde/condensation reactions, to determine the mechanism by which water may impact Coal Reactivity toward liquefaction, and to conduct D{sub 2}Omore » exchange studies to ascertain the role of water in Coal liquefaction. The objectives for this quarterly report period were (1) to measure the volumetric swelling ratio for thermally- and microwave-dried Coals and (2) to conduct preliminary experiments concerning the exchange of water in Coal with deuterium oxide (D{sub 2}O).« less
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Use of solid-state NMR techniques for the analysis of water in Coal and the effect of different Coal drying techniques on the structure and Reactivity of Coal
1991Co-Authors: D.a. NetzelAbstract:The overall objectives of this study are to develop an NMR method for measuring the water in Coal, to measure the changes in Coal structure that occur during Coal drying, to determine what effect water has on retrograde/condensation reaction, and to determine the mechanism by which water any enhance Coal Reactivity toward liquefaction. Different methods of drying will be investigated to determine if drying can be accomplished without destroying Coal Reactivity toward liquefaction, thereby making Coal drying an attractive and economical method for Coal pretreatment. Coal drying methods will include thermal drying under different atmosphere and temperatures, drying with microwave radiation, and low-temperature chemical dehydration. The objectives for this quarterly report period were (1) to hire a student to help on the program, (2) to define the Coals to be investigated and acquire the samples, (3) to order the necessary reagents and supplies, and (4) to conduct preliminary experiments for determining quantitatively using 2,2{prime}-dimethoxypropane and {sup 1}H NMR.