Nashrieh Shimi va Mohandesi Shimi Iran

Nashrieh Shimi va Mohandesi Shimi Iran

Investigation of the Compression and Purification-Amine Process Performance in the Separation of CO2 Effluent from Oxy-Fuel Combustion

Document Type : Research Article

Author
Esmaeil Koohestanian
Department of Chemical Engineering, Iranshahr Branch, Islamic Azad University, Iranshahr, I.R. IRAN
Abstract
Due to the detrimental effects of CO2 as a greenhouse gas, carbon capture and storage technology has been developed to reduce greenhouse gas emissions from major sources. Various methods have been proposed for CO2 removal, and the selection of an appropriate process depends on factors such as CO2 concentration, operational conditions, and the economic feasibility of the process. One of these methods is the CO2 compression and purification unit (CO2-CPU), which is used to capture CO2 from the oxy-fuel combustion (OFC). However, the low separation efficiency and significant discharge of CO2 into the atmosphere pose major challenges for this process. In this study, for the first time, the hybrid amine-CPU system was designed and its performance was investigated in CO2 separation from OFC flue gases. The study and simulation of the process were carried out using the Aspen Plus software. The Peng-Robinson thermodynamic equation of state and the electrolyte non-random two-liquid model were used to estimate the thermodynamic properties in the CPU and amine scrubbing processes, respectively. To increase accuracy, the thermodynamic coefficients in the Peng-Robinson model were improved using experimental values available in the literature. Heat integration was employed to optimize the energy consumption of the process. The results of the process integration showed that by adding two heat exchangers, about 196 GJ per year of the utility unit's thermal load could be reduced. The results of this research indicate that the proposed system can reduce CO2 outlet to the atmosphere from 27.13 percent to about 0.3 percent.
Keywords
Oxy-fuel combustion
CO2 capture
Simulation and process design
CO2-CPU
Amine scrubbing process
Heat integration

Subjects

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