Modelling and Simulation of Carbon Dioxide Capture Plant from Refinery Flue Gas in Nigeria using Aspen Hysys V8.8

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Oluwafemi Olayebi


The current global trend is to mitigate the release of carbon dioxide (CO2), a major contributor to greenhouse gases (GHG)).A tangible portion of the flue gas from most fossil fuel is carbon dioxide which can be as much as 10-25%. In petroleum and other industrial plants, CO2 concentration in exhaust stream depends on the process such as oil refining (8-9 mole% CO2). Flue gas data obtained from the refinery Fluid Catalytic Cracking Unit (FCCU) was used to study the composition of gas fed into the carbon capture plant and the amount of CO2 captured by the plantin contact with Monoethanolamine (MEA). A carbon dioxide capture plant was simulated using Aspen Hysys v8.8. It was observed that CO2 was totally cleaned off from the Sweet gas at the overhead product of the Absorber after contact with Aqueous Monoethanolamine (MEA) which is the absorbent used having compositions 29.997mole% MEA, 66.03mole% H2O and 4.00mole% CO2 in the Absorber and then absorbed in the Rich Amine at the bottom exit stream of the column with composition of 3.0mole%. The composition of CO2 captured was about 93mole% at a temperature of 33oC, a pressure of 0.7703kg/cm2 and a molar flow-rate of 282.5kgmole/h.

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