ارائه مدل نیمه‌تجربی برای دانسیته مایع هیدروکربن‌های سنگین در محدوده فشار و دما‌های مشخص

نوع مقاله : مقاله پژوهشی

نویسندگان
امیرحسین عودی 1
صالحه علامی 1
یگانه داودبیگی 2
1 دانشجوی دکتری، گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه کاشان، کاشان، ایران
2 استادیار گروه مهندسی شیمی، دانشکده مهندسی شیمی و نفت، دانشگاه هرمزگان، بندرعباس، ایران
چکیده
در صنعت نفت شناخت خواص فیزیکی و شیمیایی به‌عنوان عنصر کلیدی در توسعه و کنترل این صنعت است. دانسیته از جمله خواص مهم برش‌های نفتی می‌باشد که پژوهش حاضر باهدف دستیابی به یک مدل نیمه‌تجربی ساده برای دانسیته مایع هیدروکربن‌های سنگین در محدوده فشار‌ و دما‌های مشخص انجام شد. دانسیته هشت هیدروکربن سنگین بعد از گرد‌آوری اطلاعات تجربی و خواص بحرانی با استفاده از معادلات حالت (EOS) سوآو - ردلیچ - وانگ (SRK) و پنگ رابینسون (PR) محاسبه و تابع هدف بر اساس الگوریتم بهینه‌سازی ازدحام ذرات (PSO) کمینه شد. نتایج حاصل از مقادیر مربوط به ضرایب ثابت مدل نیمه تجربی به ترتیب گویای نسبت عکس و مستقیم دانسیته با دما و فشار است. از طرفی مقدار کم‌تر میانگین نسبی خطا برای مدل نیمه تجربی به دست آمده در مقایسه با معادلات حالت SRK و PR برای هیدروکربن‌های با تعداد کربن کم‌تر حاصل شد. همچنین در محدوده دمایی پایین‌تر این مدل عملکرد و تطابق بهتری با داده‌های تجربی دارد و به‌طور کلی رابطه حاصل در عین سادگی دارای دقت و انعطاف بالایی است. نتایج نشان داد که میانگین درصد خطای نسبی حاصل از محاسبه دانسیته مایع ۸ هیدروکربن سنگین طبق مدل نیمه‌تجربی ارائه شده ۱/۱۸ درصد می‌باشد که ۱۷/۳۳ درصد از معادله حالت  SRK کمتر و ۷/۶۷ درصد از معادله حالت PR بهتر می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

A Semi-empirical Correlation for the Liquid Density of Heavy Hydrocarbons in Certain Pressure and Temperature Ranges

نویسندگان English

Amirhossein Oudi 1
Salehe Allami 1
Yegane Davoodbeygi 2
1 Ph.D. Student, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran
2 Assistant Professor, Department of Chemical Engineering, Faculty of Chemical and Petroleum Engineering, University of Hormozgan, Bandar Abbas, Iran
چکیده English

In the oil industry, knowing the physical and chemical properties is a key element in the development and control of this industry. The present research was conducted with the aim of obtaining a simple semi-empirical correlation for the liquid density of heavy hydrocarbons in certain pressure and temperature range. Density of eight heavy hydrocarbons after collecting experimental data and critical properties using equations of state SRK and PR Calculation and objective function based on optimization algorithm PSO It was minimized. The results obtained from the values related to the constant coefficients of the semi-empirical correlation are indicative of the inverse and direct relationship of density with temperature and pressure, respectively. On the other hand, a lower value of relative average error for the obtained semi-empirical correlation compared to SRK and PR equations of state was obtained for hydrocarbons with less carbon number. Also, in the lower temperature range, this correlation has a better performance and agreement with the experimental data, and in general, the resulting relationship is simple and has high accuracy and flexibility. The results showed that the average percentage of relative error resulting from calculating the liquid density of 8 heavy hydrocarbons according to the presented semi-empirical model is 1.18%, which is 17.33% less than the SRK equation of state and 7.67% better than the PR equation of state.

کلیدواژه‌ها English

Heavy hydrocarbons
PSO algorithm
physical and chemical properties
Liquid density
Equation of state
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  • تاریخ دریافت 06 بهمن 1403
  • تاریخ بازنگری 12 اردیبهشت 1404
  • تاریخ پذیرش 30 اردیبهشت 1404