TY - JOUR
T1 - Sensitivity analysis of coal gasification in two-stage entrainedflow Gasifier
T2 - Syngas and carbon conversion prediction
AU - Alam, M. S.
AU - Wijayanta, A. T.
AU - Nakaso, K.
AU - Fukai, J.
N1 - Funding Information:
This research is supported by NEDO project under Innovative Zero-emission Coal Gasification Power Generation Project and JSPS KAKENHI Grant Number 24.6161. The authors also acknowledge the GCOE, Novel Carbon Resource Sciences, Kyushu University.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - The energy production from coal-fired power plant is increasing day by day, which result in increased CO2 emission from the existing power plant. However, CO2 emission from coal gasification can be reduced if an efficient CO2/O2/N2 coal gasification is implemented in IGCC system. Numerical simulations of coal gasification under CO2/O2/N2 gasification condition are carried out with the aim of describing the effects of model parameters, char reaction rates, operating conditions and heat losses to increase the syngas heating value and carbon conversion in a two stage entrained flow coal gasification process. The Eulerian-Lagrangian approach is applied to solve the Navier-Stokes equation and the particle dynamics. Finite rate/eddy dissipation model is used to calculate the rate of nine homogeneous gas-to-gas phase reactions. While only finite rate is used for the heterogeneous solid-to-gas phase reactions. It is found that the carbon conversions of combustor coal lie in the ranges from 97 wt% to 99 wt% for most of the calculated conditions. On the other hand, t he carbon conversion of reductor coals varies from 45 wt% to 57 wt%. A noticeable change is obtained when the gasification occurs under a high-temperature condition. Remarkable outlet results of about 32 wt% CO, 0.58 wt% H2 and 89 wt% overall carbon conversion are predicted if a high temperature of 1673K is maintained in the reductor. On the other hand, a reduced soot concentration is predicted if the O2 concentration and/or the reductor gas temperature increase(s) in the gasifier.
AB - The energy production from coal-fired power plant is increasing day by day, which result in increased CO2 emission from the existing power plant. However, CO2 emission from coal gasification can be reduced if an efficient CO2/O2/N2 coal gasification is implemented in IGCC system. Numerical simulations of coal gasification under CO2/O2/N2 gasification condition are carried out with the aim of describing the effects of model parameters, char reaction rates, operating conditions and heat losses to increase the syngas heating value and carbon conversion in a two stage entrained flow coal gasification process. The Eulerian-Lagrangian approach is applied to solve the Navier-Stokes equation and the particle dynamics. Finite rate/eddy dissipation model is used to calculate the rate of nine homogeneous gas-to-gas phase reactions. While only finite rate is used for the heterogeneous solid-to-gas phase reactions. It is found that the carbon conversions of combustor coal lie in the ranges from 97 wt% to 99 wt% for most of the calculated conditions. On the other hand, t he carbon conversion of reductor coals varies from 45 wt% to 57 wt%. A noticeable change is obtained when the gasification occurs under a high-temperature condition. Remarkable outlet results of about 32 wt% CO, 0.58 wt% H2 and 89 wt% overall carbon conversion are predicted if a high temperature of 1673K is maintained in the reductor. On the other hand, a reduced soot concentration is predicted if the O2 concentration and/or the reductor gas temperature increase(s) in the gasifier.
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U2 - 10.18186/journal-of-thermal-engineering.353727
DO - 10.18186/journal-of-thermal-engineering.353727
M3 - Article
AN - SCOPUS:85035056604
SN - 2148-7847
VL - 3
SP - 1574
EP - 1587
JO - Journal of Thermal Engineering
JF - Journal of Thermal Engineering
IS - 6
ER -