Mathematical Modeling of a Semibatch Pyrolyser for Sesame Oil Cake

Abstract

The present study deals with slow pyrolysis of sesame oil cake in an isothermally operated 50 mm diameter and 640 mm long semibatch pyrolyser in the temperature range of 673−1173 K. Under isothermal condition, a lumped parameter model has been used to determine the kinetic parameters for degradation of solid reactant and formation of volatile and char. The iso-conversional kinetics applicable for DAEM (distributed activation energy model) processes have also been determined for pyrolysis of sesame oil cake under nonisothermal conditions based on the thermogravimetric analyses data at different heating rates. The activation energies at different conversion almost follow a Gaussian distribution. On the basis of presently determined lumped kinetic parameters and the literature data for secondary pyrolysis kinetics, a mathematical model has been developed. The model can predict the time histories of unreacted solid, char, CO, H 2 , CO 2 , CH 4 and condensable pyro-oil. Simulated predictions have been compared with the experimental results satisfactorily.

Modeling of thermochemical conversion of waste biomass – a comprehensive review

“…In the first stage of their model, biomass decomposes into char, tar, and gas, and then consecutive tar cracking reaction occurs in the second stage to yield secondary tar and gas. A similar kinetic model was constructed by Sarkar et al (2014) for sesame oil cake pyrolysis in which biomass decomposes into char and volatiles, and then the volatiles are converted into main gases (CO, CO2, H2, and CH4) and inert tar. mass, mass at given time t and final mass, A is the pre-exponential factor (s -1 ), Ea is the activation energy (kJ mol -1 ), T and m are respectively the temperature (K) and its power, and R is the universal gas constant (8.314×10 -3 kJ mol -1 K -1 ).…”

“…The model predictions were adequately compatible with the experimental data with a maximum deviation of 18%. Sarkar et al (2014) developed a 1D mathematical model to simulate pyrolysis of sesame oil cake under isothermal conditions in a semi-batch pyrolyzer (fixed bed reactor) in the temperature range of 673−1173 K. The model can predict unreacted solid, char, bio-oil, CO, H2, CO2, and CH4 profiles. The model predictions satisfactorily agreed with the experimental data, and it can be used for other reactor configurations and biomass types by adopting suitable kinetic schemes.…”

Catalytic pyrolysis of lignocellulosic bio-packaging (jute) waste – kinetics using lumped and DAE (distributed activation energy) models and pyro-oil characterization

“…Aluminium Oxide [Al 2 O 3 ], zinc oxide [ZnO], sodium chloride [NaCl], potassium chloride [KCl], sodium aluminosilicate [NaAl(SiO 3 ) 2 ] procured from Merck, India have been used as catalysts. These chemicals are chosen because many of them have been reported 19,20,[23][24][25] to show catalytic activity on pyrolysis of different biomass. The particle diameter of all catalysts was approximately 0.087 mm.…”

Research and development activities in pyrolysis – Contributions from Indian scientific community – A review

“…The higher heating values of chars obtained was found to show a correlation on the fixed carbon (FC) and volatile matter (VM) and ash (A). Sarkar et al [107] dealt a mathematical modeling using lumped parameter model to determine the kinetic parameters for degradation of solid reactant and formation of volatile and char obtained from pyrolysis of sesame oil cake. They also used Friedman differential isoconversional method for to determine activation energies and frequency factors using the TGA data of sesame oil cake at different heating rates (5-25 K/min).…”