The formation and deposition of coke in industrial pyrolysis quenching system is a serious problem. There are two mechanisms for the deposition of coke inside the exchanger tubes of naphtha crackers. In the first, called chemical deposition ,the coke formed by chemical reactions at the higher temperature region is de- posited in the first half of the tubes. In the second half of the tubes ,however because of the lower temperature ( T < 500 C) ,the coke deposition increases due to the physical condensation of heavy polycyclic hydro- carbons. An accurate prediction of the exchanger parameters such as outlet temperature ,pressure and coke thickness inside the tubes is required for the ethylene plant operators. A comprehensive mathematical model for a Transfer Line Exchanger (TLX) system in the industrial plant has been developed. The model in- corporates a semi-empirical coke formation equation to predict a coke deposition rate both chemically and physically and the effect of this coke on the TLX steady state and operational time performance. This paper presents some of the results of the computer simulation for the naphtha pyrolysis quench cooler. 2003 Elsevier Science Ltd. All rights reserved. Keywords:
کلید واژگان :Coke deposition; Physical condensation; Fouling; Transfer line exchanger; Olefin plant
ارزش ریالی : 600000 ریال
با پرداخت الکترونیک