TY - JOUR
T1 - Syngas analysis by hybrid modeling of sewage sludge gasification in downdraft reactor
T2 - Validation and optimization
AU - Viswanathan, Karthickeyan
AU - Abbas, Safdar
AU - Wu, Wei
N1 - Funding Information:
This work was financially supported by the Ministry of Science and Technology of R.O.C. (Taiwan) under grant 1072211E006101, the Ministry of Education of R.O.C. (Taiwan) under grant 107RSG0011 and National Cheng Kung University Grants-NCKU 90 and Beyond for Research Fellow with grant number HUB110-22 T-3-028 and D111-G2316.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/5/1
Y1 - 2022/5/1
N2 - In general, sewage sludge obtained from the municipal wastewater treatment plant is one of the significant sources of waste for renewable energy production. In this article, the thermochemical conversion of sewage sludge through a downdraft gasifier is addressed. Two-zone equilibrium and one-zone kinetic model as the hybrid modeling of the sewage sludge gasification is proposed. Three zones of drying & pyrolysis, oxidation, and (char) reduction are modeled by using an integrated thermodynamic stoichiometric equilibrium and Langmuir-Hinshelwood kinetic model. Through the validation and sensitivity analysis, the syngas compositions and cold gas efficiency show to be sensitive to the variations of inlet flow rates of gasifying agents (air and steam), the inlet flow rate of feedstock (sewage sludge), and the temperature and pressure of the gasifier. Through the response surface methodology-based optimization algorithm, the proper operating conditions of the process can be found under the prescribed operating constraints.
AB - In general, sewage sludge obtained from the municipal wastewater treatment plant is one of the significant sources of waste for renewable energy production. In this article, the thermochemical conversion of sewage sludge through a downdraft gasifier is addressed. Two-zone equilibrium and one-zone kinetic model as the hybrid modeling of the sewage sludge gasification is proposed. Three zones of drying & pyrolysis, oxidation, and (char) reduction are modeled by using an integrated thermodynamic stoichiometric equilibrium and Langmuir-Hinshelwood kinetic model. Through the validation and sensitivity analysis, the syngas compositions and cold gas efficiency show to be sensitive to the variations of inlet flow rates of gasifying agents (air and steam), the inlet flow rate of feedstock (sewage sludge), and the temperature and pressure of the gasifier. Through the response surface methodology-based optimization algorithm, the proper operating conditions of the process can be found under the prescribed operating constraints.
UR - http://www.scopus.com/inward/record.url?scp=85126940120&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85126940120&partnerID=8YFLogxK
U2 - 10.1016/j.wasman.2022.03.018
DO - 10.1016/j.wasman.2022.03.018
M3 - Article
C2 - 35349905
AN - SCOPUS:85126940120
SN - 0956-053X
VL - 144
SP - 132
EP - 143
JO - Waste Management
JF - Waste Management
ER -