The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform

Ellen Stechel - One of the best experts on this subject based on the ideXlab platform.

  • System optimization for Fischer-Tropsch Liquid fuels production via solar hybridized dual fluidized bed gasification of solid fuels
    Energy & Fuels, 2017
    Co-Authors: Ellen Stechel, Peter J. Ashman, Graham J. Nathan
    Abstract:

    A new configuration of solar hybridized dual fluidized bed (DFB) gasification process is proposed with char separation for the production of Fischer–Tropsch (FT) Liquid fuels from solid fuels of biomass and/or coal. The addition of carbon capture with sequestration and FT reactor tail-gas recycle configurations is also assessed. The studied FT Liquid fuels production systems are simulated by using a pseudodynamic model incorporating a year long, hourly averaged solar insolation time-series. For the case with a solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output) of 2.64 and bed material storage capacity of 16 h, the calculated annual solar share of the solar hybridized coal-to-Liquids system can be increased from 12.2 to 20.3% by the addition of the char separation for a char gasification conversion of 80%. To achieve the well-to-wheel greenhouse gas emissions for FT Liquid fuels parity with diesel derive...

  • Fischer-TropschLiquid Fuel Production by Co-gasification of Coal and Biomass in a Solar Hybrid Dual Fluidized Bed Gasifier☆
    Energy Procedia, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    Abstract A coal to Liquid (CTL)polygeneration process with a solar hybrid dual fluidized bed (SDFB) gasifier (SCTL) is investigated in recently processing paper. A storage unit was integrated to store sensible heat in bed material in order to reduce the influence of solar resource transience. In this paper, a Fischer-Tropsch Liquid fuel production system via solar hybrid co-gasification of coal and biomass in SDFB gasifier (SCBTL) is investigated. The energetic and environmental performanceof the SCBTL system is assessed as a function of the biomass ratio and char conversion. It is found that the performance of the SCBTL system is found to be less sensitive to char conversion in the gasification reactor (X char,g ) than the SCTL system.As theX char,g decreases from 100% to 57%, the annually averaged solar share of the SCTL system is reduced from 24% to 0, while the solar share of the SCBTL system with wood fraction (higher heating value basis) of 0.5 and 1only decreases to 7% and 13% respectively. It is tricky to achieve very higher char conversion (especially higher than 85%) in the gasification reactor we studied, so this reduction of impact of the char conversion is very important. To achieve a mine-to-tank (MTT) GHG emission which can match the well-to-tank (WTT) greenhouse gas (GHG) emission, a wood fraction of 0.24 and 0.37 is required respectively for the SCBTL system with a char conversion of 100% and 70%, while this required fraction is increased to 0.45 for the non-solar equivalent. However, parameters optimization and other system design options need to be studied to improve the performance of SCBTL further and adjust the ratio of FTL to net electricity in the system output.

  • Performance Assessment of Fischer–Tropsch Liquid Fuels Production by Solar Hybridized Dual Fluidized Bed Gasification of Lignite
    Energy & Fuels, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    A novel solar hybridized dual fluidized bed (DFB) gasification process for Fischer–Tropsch Liquid (FTL) fuels production is proposed and investigated here for the case with lignite as the fuel, although it is also applicable to biomass. The concept offers sensible thermal storage of bed material, the use of inert particles in the solar receiver to avoid the need for sealing, and a process that delivers a constant production rate and quality of syngas despite solar variability. This solar hybridized coal-to-Liquids (SCTL) process is simulated using a pseudodynamic model that assumes steady state operation at each time step for a one-year, hourly integrated solar insolation time series. The annual energetic and environmental performance of this SCTL process is investigated as a function of the solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output), bed material storage capacity, the assumed char conversion in...

Xiangbo Guo - One of the best experts on this subject based on the ideXlab platform.

  • Making Fischer-Tropsch fuels and electricity from coal and biomass: Performance and cost analysis
    Energy and Fuels, 2011
    Co-Authors: Guangjian Liu, Eric D. Larson, Thomas G Kreutz, Robert H. Williams, Xiangbo Guo
    Abstract:

    Major challenges posed by crude-oil-derived transportation fuels are high current and prospective oil prices, insecurity of Liquid fuel supplies, and climate change risks from the accumulation of fossil fuelCO2 and other greenhouse gases in the atmosphere. One option for addressing these challenges simultaneously involves producing ultraclean synthetic fuels from coal and lignocellulosic biomass with CO2 capture and storage. Detailed process simulations, lifecycle greenhouse gas emissions analyses, and cost analyses carried out in a comprehensive analytical framework are presented for 16 alternative system configurations that involve gasification-based coproduction of Fischer-Tropsch Liquid (FTL) fuels and electricity from coal and/or biomass, with and without capture and storage of byproductCO2. Systematic comparisons are made to cellulosic ethanol as an alternative low GHG-emitting Liquid fuel and to alternative options for decarbonizing stand-alone fossil-fuel power plants. The analysis indicates that FTL fuels are typically less costly to produce when electricity is generated as a major coproduct than when producing mainly Liquid fuel. Coproduction systems that utilize a cofeed of biomass and coal and incorporate CO2 capture and storage in the design offer attractive opportunities for decarbonizing Liquid fuels and power generation simultaneously. Such coproduction systems considered as power generators can provide decarbonized electricity at lower costs than is feasible with stand-alone fossil-fuel power plant options under a wide range of conditions. At a plausible GHG emissions price under a future U.S. carbon mitigation policy ($50/t CO2eq), such a coproduction system built at a scale suitable for competing as a power generator would be able to provide low-GHG-emitting synthetic fuels at the same estimated unit cost as for coal synfuels characterized by ten times theGHGgas emission rate that are produced in a plant with CO2 capture and storage that does not provide electricity as a major coproduct having three times the synfuel output capacity and requiring twice the total capital investment. Moreover, the low GHG-emitting synfuels produced by such systems would be less costly to produce than cellulosic ethanol and require only half as much lignocellulosic biomass.

Graham J. Nathan - One of the best experts on this subject based on the ideXlab platform.

  • System optimization for Fischer-Tropsch Liquid fuels production via solar hybridized dual fluidized bed gasification of solid fuels
    Energy & Fuels, 2017
    Co-Authors: Ellen Stechel, Peter J. Ashman, Graham J. Nathan
    Abstract:

    A new configuration of solar hybridized dual fluidized bed (DFB) gasification process is proposed with char separation for the production of Fischer–Tropsch (FT) Liquid fuels from solid fuels of biomass and/or coal. The addition of carbon capture with sequestration and FT reactor tail-gas recycle configurations is also assessed. The studied FT Liquid fuels production systems are simulated by using a pseudodynamic model incorporating a year long, hourly averaged solar insolation time-series. For the case with a solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output) of 2.64 and bed material storage capacity of 16 h, the calculated annual solar share of the solar hybridized coal-to-Liquids system can be increased from 12.2 to 20.3% by the addition of the char separation for a char gasification conversion of 80%. To achieve the well-to-wheel greenhouse gas emissions for FT Liquid fuels parity with diesel derive...

  • Fischer-TropschLiquid Fuel Production by Co-gasification of Coal and Biomass in a Solar Hybrid Dual Fluidized Bed Gasifier☆
    Energy Procedia, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    Abstract A coal to Liquid (CTL)polygeneration process with a solar hybrid dual fluidized bed (SDFB) gasifier (SCTL) is investigated in recently processing paper. A storage unit was integrated to store sensible heat in bed material in order to reduce the influence of solar resource transience. In this paper, a Fischer-Tropsch Liquid fuel production system via solar hybrid co-gasification of coal and biomass in SDFB gasifier (SCBTL) is investigated. The energetic and environmental performanceof the SCBTL system is assessed as a function of the biomass ratio and char conversion. It is found that the performance of the SCBTL system is found to be less sensitive to char conversion in the gasification reactor (X char,g ) than the SCTL system.As theX char,g decreases from 100% to 57%, the annually averaged solar share of the SCTL system is reduced from 24% to 0, while the solar share of the SCBTL system with wood fraction (higher heating value basis) of 0.5 and 1only decreases to 7% and 13% respectively. It is tricky to achieve very higher char conversion (especially higher than 85%) in the gasification reactor we studied, so this reduction of impact of the char conversion is very important. To achieve a mine-to-tank (MTT) GHG emission which can match the well-to-tank (WTT) greenhouse gas (GHG) emission, a wood fraction of 0.24 and 0.37 is required respectively for the SCBTL system with a char conversion of 100% and 70%, while this required fraction is increased to 0.45 for the non-solar equivalent. However, parameters optimization and other system design options need to be studied to improve the performance of SCBTL further and adjust the ratio of FTL to net electricity in the system output.

  • Performance Assessment of Fischer–Tropsch Liquid Fuels Production by Solar Hybridized Dual Fluidized Bed Gasification of Lignite
    Energy & Fuels, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    A novel solar hybridized dual fluidized bed (DFB) gasification process for Fischer–Tropsch Liquid (FTL) fuels production is proposed and investigated here for the case with lignite as the fuel, although it is also applicable to biomass. The concept offers sensible thermal storage of bed material, the use of inert particles in the solar receiver to avoid the need for sealing, and a process that delivers a constant production rate and quality of syngas despite solar variability. This solar hybridized coal-to-Liquids (SCTL) process is simulated using a pseudodynamic model that assumes steady state operation at each time step for a one-year, hourly integrated solar insolation time series. The annual energetic and environmental performance of this SCTL process is investigated as a function of the solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output), bed material storage capacity, the assumed char conversion in...

Thomas G Kreutz - One of the best experts on this subject based on the ideXlab platform.

  • Co-production of decarbonized synfuels and electricity from coal + biomass with CO2 capture and storage: an Illinois case study
    Energy and Environmental Science, 2020
    Co-Authors: Eric David Larson, Thomas G Kreutz, Robert H. Williams, Giulia Fiorese, Stefano Consonni
    Abstract:

    Energy, carbon, and economic performances are estimated for facilities co-producing Fischer–Tropsch Liquid (FTL) fuels and electricity from a co-feed of biomass and coal in Illinois, with capture and storage of by-product CO2. The estimates include detailed modeling of supply systems for corn stover or mixed prairie grasses (MPG) and of feedstock conversion facilities. Biomass feedstock costs in Illinois (delivered at a rate of one million tonnes per year, dry basis) are $ 3.8/GJHHV for corn stover and $ 7.2/GJHHV for MPG. Under a strong carbon mitigation policy, the economics of co-producing low-carbon fuels and electricity from a co-feed of biomass and coal in Illinois are promising. An extrapolation to the United States of the results for Illinois suggests that nationally significant amounts of low-carbon fuels and electricity could be produced this way.

  • Making Fischer-Tropsch Fuels and Electricity from Coal and Biomass: Performance and Cost Analysis
    Energy & Fuels, 2011
    Co-Authors: Eric David Larson, Robert H. Williams, Thomas G Kreutz
    Abstract:

    Major challenges posed by crude-oil-derived transportation fuels are high current and prospective oil prices, insecurity of Liquid fuel supplies, and climate change risks from the accumulation of fossil fuel CO2 and other greenhouse gases in the atmosphere. One option for addressing these challenges simultaneously involves producing ultraclean synthetic fuels from coal and lignocellulosic biomass with CO2 capture and storage. Detailed process simulations, lifecycle greenhouse gas emissions analyses, and cost analyses carried out in a comprehensive analytical framework are presented for 16 alternative system configurations that involve gasification-based coproduction of Fischer−Tropsch Liquid (FTL) fuels and electricity from coal and/or biomass, with and without capture and storage of byproduct CO2. Systematic comparisons are made to cellulosic ethanol as an alternative low GHG-emitting Liquid fuel and to alternative options for decarbonizing stand-alone fossil-fuel power plants. The analysis indicates tha...

  • Making Fischer-Tropsch fuels and electricity from coal and biomass: Performance and cost analysis
    Energy and Fuels, 2011
    Co-Authors: Guangjian Liu, Eric D. Larson, Thomas G Kreutz, Robert H. Williams, Xiangbo Guo
    Abstract:

    Major challenges posed by crude-oil-derived transportation fuels are high current and prospective oil prices, insecurity of Liquid fuel supplies, and climate change risks from the accumulation of fossil fuelCO2 and other greenhouse gases in the atmosphere. One option for addressing these challenges simultaneously involves producing ultraclean synthetic fuels from coal and lignocellulosic biomass with CO2 capture and storage. Detailed process simulations, lifecycle greenhouse gas emissions analyses, and cost analyses carried out in a comprehensive analytical framework are presented for 16 alternative system configurations that involve gasification-based coproduction of Fischer-Tropsch Liquid (FTL) fuels and electricity from coal and/or biomass, with and without capture and storage of byproductCO2. Systematic comparisons are made to cellulosic ethanol as an alternative low GHG-emitting Liquid fuel and to alternative options for decarbonizing stand-alone fossil-fuel power plants. The analysis indicates that FTL fuels are typically less costly to produce when electricity is generated as a major coproduct than when producing mainly Liquid fuel. Coproduction systems that utilize a cofeed of biomass and coal and incorporate CO2 capture and storage in the design offer attractive opportunities for decarbonizing Liquid fuels and power generation simultaneously. Such coproduction systems considered as power generators can provide decarbonized electricity at lower costs than is feasible with stand-alone fossil-fuel power plant options under a wide range of conditions. At a plausible GHG emissions price under a future U.S. carbon mitigation policy ($50/t CO2eq), such a coproduction system built at a scale suitable for competing as a power generator would be able to provide low-GHG-emitting synthetic fuels at the same estimated unit cost as for coal synfuels characterized by ten times theGHGgas emission rate that are produced in a plant with CO2 capture and storage that does not provide electricity as a major coproduct having three times the synfuel output capacity and requiring twice the total capital investment. Moreover, the low GHG-emitting synfuels produced by such systems would be less costly to produce than cellulosic ethanol and require only half as much lignocellulosic biomass.

  • Co-production of synfuels and electricity from coal + biomass with zero net carbon emissions: An Illinois case study
    Energy Procedia, 2009
    Co-Authors: Eric David Larson, Thomas G Kreutz, Robert H. Williams, Giulia Fiorese, Stefano Consonni
    Abstract:

    Abstract Energy, carbon, and economic performance are estimated for facilities co-producing Fischer–Tropsch Liquid (FTL) fuels and electricity from a co-feed of biomass and coal in Illinois, with capture and storage of by-product CO 2 . The estimates include detailed models of supply systems for corn stover or mixed prairie grasses and of feedstock conversion facilities. The Illinois results are extrapolated to estimate the potential FTL production in 23 states.

Peter J. Ashman - One of the best experts on this subject based on the ideXlab platform.

  • System optimization for Fischer-Tropsch Liquid fuels production via solar hybridized dual fluidized bed gasification of solid fuels
    Energy & Fuels, 2017
    Co-Authors: Ellen Stechel, Peter J. Ashman, Graham J. Nathan
    Abstract:

    A new configuration of solar hybridized dual fluidized bed (DFB) gasification process is proposed with char separation for the production of Fischer–Tropsch (FT) Liquid fuels from solid fuels of biomass and/or coal. The addition of carbon capture with sequestration and FT reactor tail-gas recycle configurations is also assessed. The studied FT Liquid fuels production systems are simulated by using a pseudodynamic model incorporating a year long, hourly averaged solar insolation time-series. For the case with a solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output) of 2.64 and bed material storage capacity of 16 h, the calculated annual solar share of the solar hybridized coal-to-Liquids system can be increased from 12.2 to 20.3% by the addition of the char separation for a char gasification conversion of 80%. To achieve the well-to-wheel greenhouse gas emissions for FT Liquid fuels parity with diesel derive...

  • Fischer-TropschLiquid Fuel Production by Co-gasification of Coal and Biomass in a Solar Hybrid Dual Fluidized Bed Gasifier☆
    Energy Procedia, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    Abstract A coal to Liquid (CTL)polygeneration process with a solar hybrid dual fluidized bed (SDFB) gasifier (SCTL) is investigated in recently processing paper. A storage unit was integrated to store sensible heat in bed material in order to reduce the influence of solar resource transience. In this paper, a Fischer-Tropsch Liquid fuel production system via solar hybrid co-gasification of coal and biomass in SDFB gasifier (SCBTL) is investigated. The energetic and environmental performanceof the SCBTL system is assessed as a function of the biomass ratio and char conversion. It is found that the performance of the SCBTL system is found to be less sensitive to char conversion in the gasification reactor (X char,g ) than the SCTL system.As theX char,g decreases from 100% to 57%, the annually averaged solar share of the SCTL system is reduced from 24% to 0, while the solar share of the SCBTL system with wood fraction (higher heating value basis) of 0.5 and 1only decreases to 7% and 13% respectively. It is tricky to achieve very higher char conversion (especially higher than 85%) in the gasification reactor we studied, so this reduction of impact of the char conversion is very important. To achieve a mine-to-tank (MTT) GHG emission which can match the well-to-tank (WTT) greenhouse gas (GHG) emission, a wood fraction of 0.24 and 0.37 is required respectively for the SCBTL system with a char conversion of 100% and 70%, while this required fraction is increased to 0.45 for the non-solar equivalent. However, parameters optimization and other system design options need to be studied to improve the performance of SCBTL further and adjust the ratio of FTL to net electricity in the system output.

  • Performance Assessment of Fischer–Tropsch Liquid Fuels Production by Solar Hybridized Dual Fluidized Bed Gasification of Lignite
    Energy & Fuels, 2015
    Co-Authors: Peter J. Ashman, Graham J. Nathan, Ellen Stechel
    Abstract:

    A novel solar hybridized dual fluidized bed (DFB) gasification process for Fischer–Tropsch Liquid (FTL) fuels production is proposed and investigated here for the case with lignite as the fuel, although it is also applicable to biomass. The concept offers sensible thermal storage of bed material, the use of inert particles in the solar receiver to avoid the need for sealing, and a process that delivers a constant production rate and quality of syngas despite solar variability. This solar hybridized coal-to-Liquids (SCTL) process is simulated using a pseudodynamic model that assumes steady state operation at each time step for a one-year, hourly integrated solar insolation time series. The annual energetic and environmental performance of this SCTL process is investigated as a function of the solar multiple (i.e., the heliostat field area relative to that required to meet the demand of the DFB gasifier at the point of peak solar thermal output), bed material storage capacity, the assumed char conversion in...