Simulation and Capacity Evaluation of Refinery Flare System and Comparative Analysis of Carbon Capture Technologies

Document Type : Research Article


1 Chemical Engineering Department, NED University of Engineering &Technology, Karachi, PAKISTAN

2 Polymer and Petrochemical Engineering Department, NED University of Engineering &Technology, Karachi, PAKISTAN


In a refinery flare system is the last defense line for controlling the over-pressurization of process vessels. Mostly power failure is the worst contingency in the refinery, and the flare capacity is evaluated for this case. The data of Pressure Safety Vessels (PSVs), header network, knockout drums, flare stack, and flare tip is to utilize for simulating the flare system of the Oil Refinery Complex (ORC-II). In power failure contingency out of fourteen PSVs, four were found to have higher back pressures than the allowable limits, those PSVs were resized and new models have been proposed. Carbon dioxide (CO2) is a significant benefactor of global warming stances a severe hazard to the environment. The danger of natural contamination might be diminished by downstream usage of post-combustion vent gases which principally originate from power plants, gas, or oil fields, and the cement industry with the essential spotlight on CO2 catch. Post-combustion is a broadly utilized system as a result of its similarity with the existing force plant framework. The procedure was conveyed using 30 wt. % monoethanolamine (MEA) dissolvable and Hollow-fiber cellulose acetic membrane framework. This research consists of two sections. In the initial segment, the capacity evaluation of the flare framework was finished utilizing Aspen Flare System Analyzer V8.4 and the rating of the flare framework was conveyed in which to break down the necessary parameters like Mach number and back weight in the system and the adjustments in the flare framework were made as per API 520. In the second part chemical absorption and membrane separation innovations were looked at for post-combustion carbon catch. The research focuses on conveying a relative investigation of the above-expressed methods for the flow rate of vent gas runs between 1 to 200 MMSCFD. The goal is to accomplish 90% recuperation of CO2 with carbon decrease from 10.66 mole % to 2 mole %. The absorption technique is simulated by ASPEN HYSYS V8.4 and a program for membrane framework is created by connecting values from ASPEN HYSYS to Microsoft EXCEL. For membrane separation, the operating expense is seen as lower than the absorption process, yet from the results, it was concluded that the absorption technique is superior to the membrane technique until the problems concerning the degradation of the membrane and high capital expense would be settled.


Main Subjects

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