Optimization of the ABB Randall process of NGL recovery
1 Centre for Gas, Refining and Petrochemicals Engineering, University of Port Harcourt, Nigeria.
2 Department of Chemical Engineering, University of Port Harcourt, Nigeria.
Research Article
World Journal of Advanced Engineering Technology and Sciences, 2023, 10(02), 051–057.
Article DOI: 10.30574/wjaets.2023.10.2.0287
Publication history:
Received on 01 October 2023; revised on 16 November 2023; accepted on 18 November 2023
Abstract:
In the simulated ABB Randall Process before optimisation, it was found that the process initially achieved a yield of 72%, indicating the potential for further improvement and optimization. Replacing J-T valves with an expander, led to a remarkable drop in the DeMethanizer inlet temperature, from -150°C to -274°C, resulting in more efficient recovery of heavier hydrocarbons. This lower temperature was attained through isentropic expansion, with the expander's work driving a compressor to enhance overall plant efficiency. A comparative analysis between the unmodified ABB Randall process and the optimized version demonstrated the clear advantages of the latter. The optimized process exhibited higher annual revenue, increased annual savings, a shorter payback period, reduced energy costs, and a substantial improvement in natural gas liquids (NGL) recovery, with a recovery rate of 96.4%. While the initial capital cost investment for the optimized process was slightly higher, the accrued financial and operational benefits make it a more attractive and cost-effective choice in the long run.
Keywords:
ABB Randall Process; Optimization; Simulated Model; Natural Gas Liquids (NGL) Efficiency
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