توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Modeling and simulation of coke deposition in transfer line exchanger (TLE) of olefin plant
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۱۱
The formation and deposition of coke in thermal cracking reactors of naphta feed and also in the quenching systems is a common problem. The quenching and cooling of the cracked hydrocarbons are carried out in the transfer line exchanger (TLE). The exchanger characteristics and operating condition, such as the temperature of the exit gas stream, the operating pressure of the gas stream and the coke thickness inside the tubes, are the key factors in monitoring the operation of the olefin plant its troubleshooting. In the present study, a new mathematical model
for investigation of coke deposition in TLE of naphta pyrolysis reactor was developed and the coke formation in TLE of Arak petrochemical complex olefin plant was simulated musing developed software. The results include 10 profiles such as the prediction of deposited coke thickness, the temperature and pressure profiles of the gas product stream and the concentration distribution profiles of the product stream. The coking precursors included in the model are: ethylene and propylene (as olefins),butadiene(as a diolefin),benzene,toluene,xylene and
styrene(as aromatics).The obtained results of the modeling showed a good compromise with the actual plant data of olefin plant of Arak petrochemical complex.<\div>

۲Modeling and simulation of coil–wire insert in concentric tubes and evaluation of its effect on heat transfer enhancement
نویسنده(ها): ،
اطلاعات انتشار: ششمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۸
In the present study, the heat transfer characteristics and the pressure drop of the horizontal double pipe with coil–wire insert are Investigated with fluent software and results are compared with experimental data.The inner and outer diameters of the inner tube are 8.92 and 9.52 mm, respectively. The coiled wire is fabricated by bending a 1 mm diameter of the iron wire into a coil with a coil diameter of 7.80 mm. Cold and hot water are used as working fluids in the shell side and tube side, respectively. The software's tests are performed at 0.03 kg\s cold water and between 0.04 and 0.08 kg\s hot water flow rate. The inlet cold and hot water temperatures are between 15 °C and 40 °C, respectively. The effect of the coil pitch and relevant parameters on heat transfer characteristics and pressure drop are considered. Coil–wire insert has significant effect on the enhancement of heat transfer especially on laminar flow region. results of simulation for double pipe with coil wire insert and without coil wire insert were compared and reasonable agreement between two case were observed.<\div>
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