ARTICLE:

• TWO SIMULATION ALGORITHMS FOR INDUSTRIAL CRACKING FURNACES  download article

B. Maghboli
Department of Chemical Engineering, Arak University, Arak, Iran

H. Amani
Department of Chemical Engineering, Arak University, Arak, Iran

A. Moghadassi
Department of Chemical Engineering, Arak University, Arak, Iran

ABSTRACT

The Pyrolysis of naphtha and other hydrocarbons, which is of primary importance in the manufacture of olefins, is always accompanied by formation of coke. This paper suggests two simulation procedures that contain the information about coke formation and ethylene yield as a function of time. One is old and time consuming and not fast enough to be used in new process optimization and control methods such as RTO. This algorithm is based on zone method in simulating the furnace. The other one is a totally new simulation algorithm that significantly increases simulation speed with satisfactory accuracy. The energy-balance equations of cracking furnaces were transformed to the temperature differential equation by directly solving a quartic equation of the tube wall temperature. One set of new continuity equations for various reactants, temperature and pressure was formed.
Finally, with an actual industrial example of a cracking furnace we show the accuracy of results of the new method, compare it with the old methods and discuss its benefits.

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EQP-24 pages

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