Title: Simulation and optimisation of 1.2MT/A FCCU absorption-stabilisation system

Authors: Chang Che; Zhibing Shen; Jinhang Song; Haolong Ning; Shunmei Wang; Ruiyuan Tang; Shengrong Liang; Juntao Zhang; Bin Tian

Addresses: Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' Xi'an Key Laboratory of Low-Carbon Utilization for High-Carbon Resources, College of Chemistry and Chemical Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China ' School of Chemical Engineering, Northwest University, Xi'an 710069, China

Abstract: Catalytic cracking is the primary process in petroleum refining and the absorption and stabilisation system is critical to producing liquefied petrochemical gas (LPG) and stabilising gasoline. According to the analysis, installing a direct contact heat exchange tower (HET) after the compressor could decrease duty of cooling exchanger of the compressed rich gas. The compressed rich gas could be allowed to directly enter and exchange heat with the rich absorption gasoline and desorption gas in HET. The original compressed rich gas cooling exchanger only is used to cool down the gas from HET. Thus the energy consumption of the exchanger could be considerably decreased and the electricity was saved 1,672 kW•h. In other hand, the feed of the desorption tower was changed to Hot and cold double feeding two feeds Thus the duty of the reboiler of the desorption tower was reduced and the steam consumption of 3.5 MPa was saved 2.73t/h. [Received: February 9, 2024; Accepted: April 30, 2024]

Keywords: absorption-stabilisation; process simulation; energy conservation; system optimisation; liquefied petrochemical gas; LPG; heat exchange tower; HET.

DOI: 10.1504/IJOGCT.2025.144541

International Journal of Oil, Gas and Coal Technology, 2025 Vol.37 No.2, pp.165 - 177

Received: 06 Feb 2024
Accepted: 30 Apr 2024
Published online: 18 Feb 2025 *

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