Title:
Analysis of a Combustion Process to Burn The Gas from Biomass Pyrolysis
Author(s):
Guerra, D.R.S., Vilas Boas, A.C.M., Tarelho, L.A.C., Nogueira, M.F.M, Matos, M.A.A.
Document(s):
Paper
Abstract:
In this work it is analyzed the combustion of pyrolysis gas to produce the thermal energy required in biomass pyrolysis process. For this purpose, the pyrolysis vapor composition was obtained from experimental data using a bench scale fixed reactor. The biomasses used in this work were acacia, gorse and eucalyptus sawdust. Reactant and product species, in pyrolysis and combustion processes, had theirenthalpy of formation and sensible enthalpy variationsevaluated in order to quantify the species absolute enthalpy and mixture total enthalpy. Knowing the inlet and outlet mixture total enthalpy, the heat required forthe pyrolysis process was determined. Similarly, for the combustion process, knowing the inlet total enthalpy and the amount of heat needed to the pyrolysis process, the exhaust gas total enthalpy was determined.The objective here was to determine the amount of pyrolysis vapors thatneeded to be burned toprovide the minimum amount of heat for the pyrolysis process at distinct operating conditions. The simulations showed that a minimum of 30%, in molar basis, of the pyrolysis vapors is need to be burned. The equivalence ratios adopted for the combustion process are in the range of 0.6 to 0.8. Adiabatic and exhaust gas temperatures in the combustion chamber were evaluated and are in the range of 600K to1200K.Regarding the combustion reactordimensions, an analysis involving the combustion gas residence time as a function of the pyrolysis vaporsfraction burned, equivalence ratio and temperature was used. The results show that the hydraulic diameter of the combustor can be between 0.4m and 0.6m with 1.0m of length.
Keywords:
combustion, energy balance, pyrolysis, vegetable biomass
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers and Sustainable Biofuels
Subtopic:
Pyrolysis
Event:
30th European Biomass Conference and Exhibition
Session:
5BV.10.12
Pages:
971 - 979
ISBN:
978-88-89407-22-6
Paper DOI:
10.5071/30thEUBCE2022-5BV.10.12
Price:
FREE
