Title:
A Methodology to Estimate Biomass Combustion Time from a Limited set of Readily Measurable Parameters
Author(s):
Asheruddin, N.M., Shivapuji, A.M., Dasappa, S.
Document(s):
Paper
Poster
Abstract:
The current work reports an extensive experimental investigation on char conversion with O2, CO2 and H2O, over a wide range of particle size (8 mm - 20 mm), particle density (219 kg/m3 – 348 kg/m3), temperature (673 K – 1273 K), and reactant concentration (20% - 100%). A generic one-dimensional numerical model with limited set of assumptions is formulated and employed to gain insight into intra-particle dynamics under different conversion regimes. With regards to influence of particle size, it is observed that while the dependence is quadratic in nature in case of char oxidation (diffusion regime), linear dependence is noted in case of char-CO2 reaction (kinetic regime), and d01.3 dependence in case of char-H2O reaction indicates a competitive regime. A parametric analysis of density on char conversion process indicates that it has a linear dependence. The influence of temperature is exponential and is observed to be minimal in case of char-oxidation (e^(1.76/T)) process and maximum in case of char-CO2 conversion (e^(16.8/T)). Noting that the char oxidation is a limited by transport of O2, it is strongly influenced by the reactant concentration (XO2-1.3). A compound equation to estimate the conversion time for a given temperature, reactant concentration, particle size and density for different reactants is obtained.
Keywords:
thermochemical conversion, char, conversion
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Gasification for synthesis gas production
Event:
30th European Biomass Conference and Exhibition
Session:
4CV.5.5
Pages:
786 - 789
ISBN:
978-88-89407-22-6
Paper DOI:
10.5071/30thEUBCE2022-4CV.5.5
Price:
FREE
