Modelling Individual Evolved Gas Yields from Cashew Nut and Coconut Shells Pyrolysis
2007 (English)In: Clean Air, ISSN 1561-4417Article in journal (Other academic) Submitted
Coconut and cashew nut shells are some of the biomass wastes typically available in many tropical countries. As renewable resources, they are eligible as important green sources for energy generation. Despite this evident fact, they are not yet commonly studied as such. In fact, while coconut shells are commonly known as activated carbon raw material, cashew nut shells are mostly known as cnsl precursors. Both products are of great importance commercially. In this research study, a non-isothermal pyrolysis of these two biomass wastes is performed using TGFTIR, at moderate heating rates (10, 30 and 100 K/min) with the objective of identifying the evolved gases and determine the respective intrinsic kinetics. This TG-FTIR system continuously monitors i) the time dependent evolution of volatiles, ii) the tars evolution rate, and iii) the weight of char. FT-IR spectra were obtained every 30 seconds and quantification of all volatiles (except tars) was done from quantification routines obtained from calibration runs with pure compounds. The data are used to generate input files that are used in a code based on the distributed activation energy model (DAEM). Using the code and the input files generated, the gas yields were predicted for comparison with the experimental results, at the same conditions. The prediction results showed a good agreement with the experimental data. Thus, the code was extended to very high heating rates (1000 and 10,000 K/s). The results at low heating rates are compared to the literature available data obtained under analogous conditions.
Place, publisher, year, edition, pages
biomass wastes, pyrolysis, kinetics, yields
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-9143OAI: oai:DiVA.org:kth-9143DiVA: diva2:25246
QS 201203142008-09-242008-09-242012-03-14Bibliographically approved