Journal
FUEL PROCESSING TECHNOLOGY
Volume 128, Issue -, Pages 199-210Publisher
ELSEVIER
DOI: 10.1016/j.fuproc.2014.07.017
Keywords
Air steam biomass gasification (ASBG); Fluidized-bed; Thermodynamic equilibrium model; Non-equilibrium factor; Auto-thermal gasification
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [2011-0006827]
- RCOE program of KITECH (Korea Institute of Industrial Technology)
- National Research Foundation of Korea [2011-0006827] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Gasification is one of the most promising technologies for converting biomass into a fuel. This study presents a simple and practical biomass gasification model based on thermodynamic equilibrium to find effective operating conditions of the air-steam gasification system in fluidized-beds. The carbon conversion fraction empirically obtained was involved in a global gasification reaction. Two empirical equations as the non-equilibrium factor expressing the deviation from equilibrium were derived as the function of the equivalence ratio (ER) from 43 experimental data sets of various operating conditions and different feedstocks. One energy balance was also solved for determining the gasification temperature (7). After the producer gas composition with respect to ER and steam to biomass ratio (SBR) was obtained from the air-steam biomass gasification (ASBG) model, process performances such as lower heating value, heat efficiency, net heat efficiency, and H-2/CO molar ratio were evaluated. An effective operating area was suggested from the contour plot of the process performances with respect to ER and SBR in the auto-thermal gasification temperature from 700 to 830 T. (C) 2014 Elsevier B.V. All rights reserved.
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