Abstract Here,we provide a status update of an integrated gasification fuel cell(IGFC)power-generation system being developed at the National Institute of Clean-and-Low-Carbon in China at the megawatt thermal(MWth)sca...Abstract Here,we provide a status update of an integrated gasification fuel cell(IGFC)power-generation system being developed at the National Institute of Clean-and-Low-Carbon in China at the megawatt thermal(MWth)scale.This system is designed to use coal as fuel to produce syngas as a first step,similar to that employed for the integrated gasification combined cycle.Subsequently,the solid-oxide fuel-cell(SOFC)system is used to convert chemical energy to electricity directly through an electrochemical reaction without combustion.This system leads to higher efficiency as compared with that from a traditional coal-fired power plant.The unreacted fuel in the SOFC system is transported to an oxygencombustor to be converted to steam and carbon dioxide(CO_(2)).Through a heat-recovery system,the steam is condensed and removed,and CO_(2) is enriched and captured for sequestration or utilization.Comprehensive economic analyses for a typical IGFC system was performed and the results were compared with those for a supercritical pulverized coal-fired power plant.The SOFC stacks selected for IGFC development were tested and qualified under hydrogen and simulated coal syngas fuel.Experimental results using SOFC stacks and thermodynamic analyses indicated that the control of hydrogen/CO ratio of syngas and steam/CO ratio is important to avoid carbon deposition with the fuel pipe.A 20-kW SOFC unit is under development with design power output of 20 kW and DC efficiency of 50.41%.A 100 kW-level subsystem will consist of 6920-kW power-generation units,and the MWth IGFC system will consist of 59100 kWlevel subsystems.展开更多
Syngas cleanup is a major challenge in any coal or biomass gasification application. A modified syngas cleanup process is under development to improve syngas from low rank coals for CTL （coal to liquids） application...Syngas cleanup is a major challenge in any coal or biomass gasification application. A modified syngas cleanup process is under development to improve syngas from low rank coals for CTL （coal to liquids） applications. Novel steam reforming catalysts were developed to convert tars and light hydrocarbons and decompose ammonia in the presence of syngas contaminants such as H2S （〈 500 ppm）. Process goals are to improve syngas yield and H2：CO ratio while reducing water gas shift and downstream gas cleanup requirements. Laboratory reforming experiments were focused on developing information to support a techno-economic analysis using TRIG （transport reactor integrated gasifiers） or LURGI gasifiers. A CTL with carbon capture model was developed to compare the economics of the new process including the catalytic steam reforming to DOE （Department of Energy） baseline CTL. Reforming catalysts were developed that had high methane, tar, and ammonia conversion in presence of 90 ppm H2S. Higher concentrations of H2S affected conversion of methane but catalyst performance was fairly stable for the duration of testing. Results of modeling indicated that economics of the new process were nearly identical to the baseline CTL case, but greenhouse gas emissions for a given production of fuels were approximately 50% lower.展开更多
基金The authors thank the Ministry of Science and Technology of the People’s Republic of China for financial support under contract of 2017YEB061900。
文摘Abstract Here,we provide a status update of an integrated gasification fuel cell(IGFC)power-generation system being developed at the National Institute of Clean-and-Low-Carbon in China at the megawatt thermal(MWth)scale.This system is designed to use coal as fuel to produce syngas as a first step,similar to that employed for the integrated gasification combined cycle.Subsequently,the solid-oxide fuel-cell(SOFC)system is used to convert chemical energy to electricity directly through an electrochemical reaction without combustion.This system leads to higher efficiency as compared with that from a traditional coal-fired power plant.The unreacted fuel in the SOFC system is transported to an oxygencombustor to be converted to steam and carbon dioxide(CO_(2)).Through a heat-recovery system,the steam is condensed and removed,and CO_(2) is enriched and captured for sequestration or utilization.Comprehensive economic analyses for a typical IGFC system was performed and the results were compared with those for a supercritical pulverized coal-fired power plant.The SOFC stacks selected for IGFC development were tested and qualified under hydrogen and simulated coal syngas fuel.Experimental results using SOFC stacks and thermodynamic analyses indicated that the control of hydrogen/CO ratio of syngas and steam/CO ratio is important to avoid carbon deposition with the fuel pipe.A 20-kW SOFC unit is under development with design power output of 20 kW and DC efficiency of 50.41%.A 100 kW-level subsystem will consist of 6920-kW power-generation units,and the MWth IGFC system will consist of 59100 kWlevel subsystems.
文摘Syngas cleanup is a major challenge in any coal or biomass gasification application. A modified syngas cleanup process is under development to improve syngas from low rank coals for CTL （coal to liquids） applications. Novel steam reforming catalysts were developed to convert tars and light hydrocarbons and decompose ammonia in the presence of syngas contaminants such as H2S （〈 500 ppm）. Process goals are to improve syngas yield and H2：CO ratio while reducing water gas shift and downstream gas cleanup requirements. Laboratory reforming experiments were focused on developing information to support a techno-economic analysis using TRIG （transport reactor integrated gasifiers） or LURGI gasifiers. A CTL with carbon capture model was developed to compare the economics of the new process including the catalytic steam reforming to DOE （Department of Energy） baseline CTL. Reforming catalysts were developed that had high methane, tar, and ammonia conversion in presence of 90 ppm H2S. Higher concentrations of H2S affected conversion of methane but catalyst performance was fairly stable for the duration of testing. Results of modeling indicated that economics of the new process were nearly identical to the baseline CTL case, but greenhouse gas emissions for a given production of fuels were approximately 50% lower.
