TY - JOUR
T1 - Biomass gasification in a downdraft gasifier with a two-stage air supply
T2 - Effect of operating conditions on gas quality
AU - Galindo, Ana Lisbeth
AU - Lora, Electo Silva
AU - Andrade, Rubenildo Viera
AU - Giraldo, Sandra Yamile
AU - Jaén, Rene Lesme
AU - Cobas, Vladimir Melian
N1 - Funding Information:
The authors would like to thanks the Energy Company of Minas Gerais (CEMIG) , the Sao Paulo Company of Light and Force (CPFL) and the Minas Gerais State Secretary of Science and Technology (SECTES) for the financial support received for the development of this project. We also thanks the Committee on Coordination of Improvements in Higher Education (CAPES) , the National Research Council of Brazil (CNPq) and the Foundation for the Support of Researches of the State of Minas Gerais (FAPEMIG) for the graduate and research grants, and also for the allocation of research productivity grants.
PY - 2014/2
Y1 - 2014/2
N2 - The gasification of the biomass is an attractive technology for the production of electricity, heat, chemicals and liquid fuels. This paper presents an experimental evaluation of the quality of the producer gas in a two-stage, air supply downdraft gasifier, referred to its tar and particle content for different operating conditions. The gas composition and its lower heating value were also determined. Experimental tests were performed varying the operating conditions of the gasifier: the air flow between 18Nm3/h and 22Nm3/h (the proximate equivalence ratio from 3.03 to 0.279) and the air flow ratio in the two stages (AR) between 0% and 80%, evaluating the effects of these parameters over the quality of the gas. The results show that a fuel gas, with tar and particulate matter content of 54.25±0.66mg/Nm3 and 102.4±1.09mg/Nm3, respectively, was obtained, for a total air flow rate of 20±0.45Nm3/h and an air ratio, between the two stages, of 80%. For these conditions, the lower heating value of the gas was 4.74±0.5MJ/Nm3. The two stage air supply in the gasification allowed to reduce the tar content in the producer gas up-to 87% with even a slight increase in the gasifier efficiency. This results can be explained by an increase of the temperatures in the pyrolysis and combustion regions.
AB - The gasification of the biomass is an attractive technology for the production of electricity, heat, chemicals and liquid fuels. This paper presents an experimental evaluation of the quality of the producer gas in a two-stage, air supply downdraft gasifier, referred to its tar and particle content for different operating conditions. The gas composition and its lower heating value were also determined. Experimental tests were performed varying the operating conditions of the gasifier: the air flow between 18Nm3/h and 22Nm3/h (the proximate equivalence ratio from 3.03 to 0.279) and the air flow ratio in the two stages (AR) between 0% and 80%, evaluating the effects of these parameters over the quality of the gas. The results show that a fuel gas, with tar and particulate matter content of 54.25±0.66mg/Nm3 and 102.4±1.09mg/Nm3, respectively, was obtained, for a total air flow rate of 20±0.45Nm3/h and an air ratio, between the two stages, of 80%. For these conditions, the lower heating value of the gas was 4.74±0.5MJ/Nm3. The two stage air supply in the gasification allowed to reduce the tar content in the producer gas up-to 87% with even a slight increase in the gasifier efficiency. This results can be explained by an increase of the temperatures in the pyrolysis and combustion regions.
KW - Biomass gasification
KW - Gas quality
KW - Gasification performance
KW - Governing variables
KW - Two-stage downdraft gasification
UR - http://www.scopus.com/inward/record.url?scp=84893729114&partnerID=8YFLogxK
U2 - 10.1016/j.biombioe.2013.12.017
DO - 10.1016/j.biombioe.2013.12.017
M3 - Artículo Científico
AN - SCOPUS:84893729114
SN - 0961-9534
VL - 61
SP - 236
EP - 244
JO - Biomass and Bioenergy
JF - Biomass and Bioenergy
ER -
