TRANSIENT-BEHAVIOR OF A COCONUT SHELL PYROLYZER - A MATHEMATICAL-ANALYSIS

A mathematical model based on the mechanistic approach to the reaction kinetics of pyrolysis reactions and the realistic analysis of the int eraction between simultaneous heat and mass transfer along with the ch emical reaction has been developed for the design of smoothly running pyrolyzers. The model of a fixed-bed pyrolysis reactor has been propos ed on the basis of the dimensionless parameters with respect to time a nd radial position. The variation of physical parameters like bed void age, heat capacity, diffusivity, density, thermal conductivity, etc., on temperature and conversion has been taken into account. A deactivat ion model has also been incorporated to explain the behavior of pyroly sis reactions at temperaures above 673 K. The simulated results of the model have been explained by comparing them with the experimental res ults.