Techno-economic feasibility of fluid catalytic cracking unit integrated chemical looping combustion – A novel approach for CO2 capture

Güleç, Fatih; Okolie, Jude A.; Erdogan, Ahmet

Abstract

Oil refineries are collectively responsible for about 4–6% of the global CO2 emissions, largely because of the regenerator part of the Fluid Catalytic Cracking (FCC) unit (25–35%). An advanced combustion technology, also called chemical looping combustion (CLC), has been recently presented as a novel CO2 capture process for FCC units; however, no study provides the economic feasibility of a CLC-FCC unit. In this study, a techno-economic feasibility of the novel CLC-FCC unit was presented for the first time based on a case study with 50,000 barrels feed per day. A rigorous mass and energy balance estimation shows that 96 vol% of coke regeneration (combustion) was achieved in the FCC regenerator by using a stoichiometrically required amount of metal oxide (CuO modified catalysts) at 750 °C for 45 min. The preliminary energy penalty calculations of the proposed CLC-FCC unit (0.21 GJ/ton CO2) is relatively lower compared to the post-combustion (3.1–4.2 GJ/t CO2) via amine solvent and oxy-fuel combustion (1.8–2.5 GJ/t CO2) units reported in the literature. The equipment purchase cost (EPC) is 1.1 times higher than a standalone FCC unit due to the increase in the number of processing equipment required. The cash flow analysis results reveal a yearly basis average CO2 capture cost of 0.0106 US$/kg of CO2 (∼10.6 US$/ton CO2) for the CLC-FCC unit, which is lower compared to the other conventional CCS technologies i.e. oxy-fuel combustion and post-combustion. Factors such as EPC, capital expenditure (CAPEX), and discount rate significantly influenced the capture cost. In contrast, the CO2 capture cost is not influenced by a change in oxygen carrier and electricity cost.

Citation

Güleç, F., Okolie, J. A., & Erdogan, A. (2023). Techno-economic feasibility of fluid catalytic cracking unit integrated chemical looping combustion – A novel approach for CO2 capture. Energy, 284, Article 128663. https://doi.org/10.1016/j.energy.2023.128663

• Journal Article Type: Article
• Acceptance Date: Aug 5, 2023
• Online Publication Date: Aug 8, 2023
• Publication Date: Dec 1, 2023
• Deposit Date: Oct 16, 2023
• Publicly Available Date: Oct 17, 2023
• Journal: Energy
• Print ISSN: 0360-5442
• Peer Reviewed: Peer Reviewed
• Volume: 284
• Article Number: 128663
• DOI: https://doi.org/10.1016/j.energy.2023.128663
• Public URL: https://nottingham-repository.worktribe.com/output/24413742
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0360544223020571?via%3Dihub