Characteristics and Dynamics of Pyrolysis Process Microalgae

The pyrolysis characteristics of Dunaliella tertiolecta was investigated by thermogravimetric analysis. The experiments were conducted with a thermogravimetric analyzer from ambient temperature to 900 ℃ at different heating rates of 5,10,20,30 and 40 ℃/min under high purified N2.TG and DTG analyses were adopted to study the pyrolysis behavior of Dunaliella tertiolecta systematically.Results showed that three stages appeared in the pyrolysis process with increasing temperature.Moreover,the initial temperature of pyrolysis and the temperature at which the pyrolysis rate reached the peak value rose with increasing the heating rate.The kinetic analysis was made by using a composite procedure involving the iso-conversional method and the master plots method.The iso-conversional method indicated that the pyrolysis reaction can be dealt with as a single reaction model,and the master plots method revealed that this process conforms to the simple order reaction mode,Fn.The kinetic parameters were determined,of which the apparent activation energy Ea is 146.3 kJ/mol,the pre-exponential factor is 4.28×1013 s-1 and the kinetic exponent n is 2.4.