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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Heat and Mass Transfer Processes in the Fischer-Tropsch Reactor

Get access (open in a dialog) DOI: 10.1615/IHTC15.kn.000029
pages 518-542

摘要

Lecture is devoted to important scientific problems associated with synthesis of artificial oil. It will be discussed the following achievements. Methods for modelling thermodynamic equilibrium in a multicomponent system of liquid, solid and gaseous synthetic products are developed. These methods are based on modern ideas of nonequilibrium thermodynamics and statistical physics. Equilibrium compositions of liquid, solid and gaseous products are calculated on the base of system of ordinary differential equations that minimize the Gibbs energy of multicomponent mixture. Due to the absence of database on thermophysical properties of solutions of hydrocarbons with large number of carbon atoms the methods of modelling the required properties were developed. On the basis of Ergun's vacancy approach semi-empirical model of viscosity of hydrocarbon mixtures in the liquid and gaseous phases in a wide range of temperatures, pressures and concentrations is proposed. Questions connected with occurrence of temperature and concentrations auto-oscillations within catalyst granules with exothermic synthesis reactions are discussed. Based on modern methods of stochastic processes various scenarios leading to a thermal explosion of catalyst granules with internal heat release were studied. In the present paper theoretical method based on probability density function of random temperature of granules in a fluctuating temperature of synthesis products is attracted. Based on solving the system of stochastic ordinary differential equations method of simulation the random temperature of granules in fluctuating temperature of products is designed. Aerodynamics and mass transfer in a long microspore of structured synthesis reactor was considered.