A comparative TEA of a two-step process using chemical solvents for producing an ultra-sweet natural gas

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chemical Engineering Research & Design Pub Date : 2025-01-31 DOI:10.1016/j.cherd.2025.01.043

Rui Wang , Husain Ashkanani , Kathryn Smith , Isaac K. Gamwo , Bingyun Li , Badie I. Morsi

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引用次数: 0

Abstract

A comprehensive Techno-Economic Analysis (TEA) was performed to evaluate the economic feasibility of a novel two-step process (TSP) developed in Aspen Plus V12.1 to desulfurize and decarbonize a raw natural gas containing (2 mol% H₂S and 5 mol% CO₂) into an ultra-sweet natural gas containing (1.72 ppmv H₂S and 4.19 ppmv CO₂). The raw natural gas flow rate used in the TSP was 117.74 kg/s at 60 °C and 50 bar. The TSP combines an H₂S desulfurization step using potassium carbonate (K₂CO₃) and a CO₂ capture step using 3 different chemical solvents, monoethanolamine (MEA), sodium glycinate (SGS), and potassium glycinate (PGS). Both steps employ fixed-bed absorbers packed with Mellapak 250Y structured packing.

The hydraulics and mass transfer characteristics for the TSP were calculated, indicating normal operation with higher gas-side (k_G) than liquid-side (k_L) mass transfer coefficients. The TEA of TSP indicated that PGS had the most promising economic feasibility among the 3 solvents as it exhibited the lowest Levelized Cost of CO₂ capture (LCOC) of $47.54/ton.CO₂ at a Capital Expenditure (CAPEX) of $24.98 million, and an Operating Expenditure (OPEX) of $12.20 million/year. Also, the TSP could produce one MMSCF of ultra-sweet natural gas at a total cost of $339.55.

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来源期刊

Chemical Engineering Research & Design 工程技术-工程：化工

CiteScore

6.10

自引率

7.70%

发文量

623

审稿时长

42 days

期刊介绍： ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering. Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.