Optimized combustion of biomass volatiles by varying O2 and CO2 levels: A numerical simulation using a highly detailed soot formation reaction mechanism

► Optimized combustion of biomass volatiles by varying O2 and CO2 levels was studied. ► Effect of temperature on product concentration was more emphasized than that of pressure. ► High levels of CO2 at the inlet had a significant effect on PAH reduction at high temperatures (⩾1473K). ► Higher temper...

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Bibliographic Details
Published in:Bioresource technology 2012-04, Vol.110, p.645-651
Main Authors: Wijayanta, Agung Tri, Saiful Alam, Md, Nakaso, Koichi, Fukai, Jun, Shimizu, Masakata
Format: Article
Language:English
Subjects:
Biomass
Biomass volatiles
Carbon dioxide
Carbon Dioxide - analysis
Combustion
Computer simulation
Mathematical models
O2/CO2 gasification
Oxygen - analysis
Polyallylamine hydrochloride
Polycyclic aromatic hydrocarbon
Polycyclic Compounds - analysis
Reaction mechanism
Reactors
Soot
Soot formation
Volatilization
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Summary:► Optimized combustion of biomass volatiles by varying O2 and CO2 levels was studied. ► Effect of temperature on product concentration was more emphasized than that of pressure. ► High levels of CO2 at the inlet had a significant effect on PAH reduction at high temperatures (⩾1473K). ► Higher temperatures provided the increased CO and H2. ► At low temperatures, the O2 input became important in reducing PAHs. To increase syngas production and minimize soot, polycyclic aromatic hydrocarbon (PAH), and CO2 emissions resulting from biomass combustion, the evolution of biomass volatiles during O2/CO2 gasification was simulated. A highly detailed soot formation reaction mechanism flowing through the reactor, involving 276 species, 2158 conventional gas phase reactions and 1635 surface phase reactions, was modeled as a plug flow reactor (PFR). The reaction temperature and pressure were varied in the range 1073–1873K and 0.1–2MPa. The effect of temperature on product concentration was more emphasized than that of pressure. The effect of O2/CO2 input on product concentration was investigated. O2 concentration was important in reducing PAHs at low temperature. Below 1473K, an increase in the O2 concentration decreased PAH and soot production. However, if the target of CO2 concentration was higher than 0.22 in mass fraction terms, temperatures above 1473K reduced PAHs and increased CO.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2012.01.068