Techno-Economic and Environmental Analyses of an Integrated Liquefied Natural Gas/Allam–Fetvedt Cycle/Air Separation Unit Complex

Daniel Chen (), Pawanahamsa Shetty, Song Wang, Veeracharyulu Nellipudi, Fuad Aziz, Qiang Xu and Gevorg Sargsyan
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Daniel Chen: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Pawanahamsa Shetty: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Song Wang: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Veeracharyulu Nellipudi: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Fuad Aziz: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Qiang Xu: Dan F. Smith Department of Chemical & Biomolecular Engineering, Lamar University, Beaumont, TX 77710, USA
Gevorg Sargsyan: Department of Economics and Finance, College of Business, Lamar University, Beaumont, TX 77710, USA

Energies, 2024, vol. 17, issue 11, 1-19

Abstract: The natural gas (NG)-powered compressors/engines used in liquified natural gas (LNG) plants are a major source of methane emission. The Allam–Fetvedt cycle (AFC), an oxyfuel, carbon-neutral, high-efficiency power plant, generates pipeline-grade CO 2 . This work performed novel process modeling, economic analysis, and greenhouse gas emissions analysis for a heat-integrated, electrified LNG/AFC/air separation unit (ASU) complex (LAA), then compared it to standalone LNG and AFC/ASU plants (baseline) as well as an LNG plant electrified with AFC/ASU without heat integration. The low-grade heat generated from compressors of the LNG plant can enhance the AFC net power output by 7.1%. Utilizing the nitrogens cold energy reduces the compressor power requirement by 1.6%. In the integrated LAA complex, not only are GHG emissions avoided, but the energy efficiencies are also improved for both the LNG plant and the AFC power plant. A cash flow analysis of LAA was performed over a 20-year period with 5%, 7%, and 10% discount rates and three levels of LNG prices. The 45Q CO 2 credit of USD 85/T as stipulated by the recent Inflation Reduction Act (IRA) of 2022 has been incorporated. The results clearly indicate the economic and environmental benefits of the proposed electrification and heat/power integration.

Keywords: electrification; heat integration; liquefied natural gas; Allam–Fetvedt cycle; net present value; cash flow (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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