Simulacion primaria

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57 Pettrrolleum & Coall Pe o eum & Coa
ISSN 1337-7027
Available online at www.vurup.sk/pc
Petroleum & Coal 46 (2), 57-62, 2004

SIMULATION OF ATMOSPHERIC CRUDE UNIT "BADGER" USING ASPEN PLUS
Milana M. Stojić*, Svetlana Lj. Nedeljkov, Darko M. Krstić, Siniša Mauhar Faculty of Technology, University of Novi Sad, Boulevard Cara Lazara 1, Novi Sad, SCG *e-mail: nandm@EUnet.yu
Received 16August 2004;received in revised form 18 October 2004; accepted 28 October 2004

Abstract
Primary processing of oil gives fractions such as gas, gasoline, kerosene, gas oil, atmospheric residue, oil fractions and heavy residue. The quantity of each fraction is specified by the composition of oil. The main parts of this process are atmospheric and vacuum distillation preflash crude units. The objectof this work was to make a computer simulation of the atmospheric distillation using Aspen Plus simulator. The feed is preheated in the system of heat exchangers and this part of the process was included in the simulation. The operating parameters were taken from the “Badger” project documentation, which was designed for the oil refinery in Novi Sad. The simulation was performed for a type of crudeoil, which is currently in use. Furthermore, the possibility of running the process under different feed conditions was also checked.
Key words: Aspen Plus; processing of oil; Badger

Introduction Primary processing of oil gives fractions such as gas, gasoline, kerosene, gas oil, atmospheric residue, oil fractions and heavy residue (these are not final products, they need to pass severalrefinery processes). The quantity of each fraction is specified by the composition of crude oil. The main parts of this process are the atmospheric and vacuum distillation preflash crude units. This work is based on the data taken from the project documentation of the atmospheric unit in the oil refinery in Novi Sad, called Badger [1]. This refinery section is very important, because the maincharacteristics of the fractions, such as viscosity, bubble point, etc. attained from this plant are restitutes during this process. These properties have to be adjusted as well as it is possible because of the further adjustment possibilities and costs. The aim of this paper was to make a simulation of the atmospheric crude unit Badger using Aspen Plus 11.1 simulation engine provided by Aspen TechnologyLtd. [2] in order to test the unit with a crude oil which is currently in use as well as for another type of crude oil whose data were taken from Aspen Plus 11.1 Library and



Presented at the 31th International Conference of the Slovak Society of Chemical Engineering, Tatranské Matliare, 24—28 May 2004. ∗∗ The author to whom the correspondence should be addressed

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documentation fromthe oil refinery in Novi Sad. Computer simulation Thermodynamic property model A general correlation of the vapor–liquid equilibrium in hydrocarbon mixtures, the thermodynamic model Chao-Seader with Lee-Kesler enthalpy [2], was used in the simulation. Atmospheric crude unit Badger The atmospheric crude unit is shown schematically in Fig. 1. The main part of the process is a distillation column withtwo side stripers. The column has 22 stages and the stripers have four stages each. In the refinery these two
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stripers are embedded in a single column. Stripers are needed for elutriation of the desirable fraction from a lighter one. Therefore the steam is introduced in the stripers by streams (6) and (7). The crude is being preheated in series of heat exchangers using productstreams (3, 5, 8, and 9). After the furnace, the feed stream (1) enters the column on the stage 4, numbered from the bottom up. The steam (2) is used for elutriation of the heaviest fraction in the process and it enters the column on the stage 1. The stream (4) represents reflux, which enters the column on the stage 21. The reflux rate is adjusted in the splitter.

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