TY - CHAP
T1 - Process Simulations of Chemical Looping Combustion for Mixtures of Coal and Biomass Using an Iron Based Oxygen Carrier—Part I
AU - Lam, Justin
AU - Agarwal, Ramesh K.
AU - Zhang, Xiao
N1 - Publisher Copyright:
© 2020, Springer Nature Singapore Pte Ltd.
PY - 2020
Y1 - 2020
N2 - Chemical-looping combustion (CLC) is a recent carbon capture technology that has shown great promise for almost pure CO2 separation and capture in combustion of fossil fuels in power generation plants. In this paper, several process simulations of chemical-looping combustion are conducted using ASPEN Plus. The entire CLC process is modeled and validated against the experimental data using a mixture of biomass and coal and pure biomass as fuels. The effect of fuel reactor temperature on gas concentrations (namely CO2, CO, CH4 and O2) in the fuel and air reactors, the conversion efficiency of carbonaceous gases, the char conversion efficiency, the carbon capture efficiency, and the energy output are investigated. It is found that increasing the fuel reactor temperature increases the CO2 concentration in the fuel reactor for the biomass/coal mixture and decreases the CO2 concentration for pure biomass in agreement with the experimental data. However, for the coal/biomass mixture and pure biomass, there is an increase in CO concentration in the fuel reactor. Poor oxygen transport capacity of the iron ore (Fe2O3) used as an oxygen carrier results in decrease in conversion efficiency for both types of fuels. However, both types of fuel showed an increase in carbon conversion efficiency since lesser amount of residual char made it past the fuel reactor as temperatures increased. Energy output for both fuels grew steadily with increase in fuel reactor temperature, but for pure biomass it stagnated between 760 and 800 °C and it peaked for biomass/coal mixture at 960 °C. Variations of gas concentrations in fuel and air reactors as well as energy output as a function of different mass fractions of coal and biomass are also obtained. The concentrations of CO2, CO, and CH4, and energy output all decrease with decreasing fraction of coal in the coal/biomass mixture.
AB - Chemical-looping combustion (CLC) is a recent carbon capture technology that has shown great promise for almost pure CO2 separation and capture in combustion of fossil fuels in power generation plants. In this paper, several process simulations of chemical-looping combustion are conducted using ASPEN Plus. The entire CLC process is modeled and validated against the experimental data using a mixture of biomass and coal and pure biomass as fuels. The effect of fuel reactor temperature on gas concentrations (namely CO2, CO, CH4 and O2) in the fuel and air reactors, the conversion efficiency of carbonaceous gases, the char conversion efficiency, the carbon capture efficiency, and the energy output are investigated. It is found that increasing the fuel reactor temperature increases the CO2 concentration in the fuel reactor for the biomass/coal mixture and decreases the CO2 concentration for pure biomass in agreement with the experimental data. However, for the coal/biomass mixture and pure biomass, there is an increase in CO concentration in the fuel reactor. Poor oxygen transport capacity of the iron ore (Fe2O3) used as an oxygen carrier results in decrease in conversion efficiency for both types of fuels. However, both types of fuel showed an increase in carbon conversion efficiency since lesser amount of residual char made it past the fuel reactor as temperatures increased. Energy output for both fuels grew steadily with increase in fuel reactor temperature, but for pure biomass it stagnated between 760 and 800 °C and it peaked for biomass/coal mixture at 960 °C. Variations of gas concentrations in fuel and air reactors as well as energy output as a function of different mass fractions of coal and biomass are also obtained. The concentrations of CO2, CO, and CH4, and energy output all decrease with decreasing fraction of coal in the coal/biomass mixture.
KW - Biomass
KW - Carbon capture efficiency
KW - Chemical looping combustion
KW - Coal
KW - Process simulation
UR - http://www.scopus.com/inward/record.url?scp=85103881627&partnerID=8YFLogxK
U2 - 10.1007/978-981-15-0410-5_11
DO - 10.1007/978-981-15-0410-5_11
M3 - Chapter
AN - SCOPUS:85103881627
T3 - Energy, Environment, and Sustainability
SP - 159
EP - 175
BT - Energy, Environment, and Sustainability
PB - Springer Nature
ER -