Technical, Economical, and Environmental Performance Assessment of an Improved Triethylene Glycol Dehydration Process for Shale Gas

Liu, Gaihuan; Zhu, Lin; Hong, Jinmen; Liu, Huimin

doi:10.1021/acsomega.1c05236

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…The CO 2 stream arrives at CO 2 -DEHY (Figure 5) at a high pressure (50 bar), favoring water removal [27]. The CO 2 -to-CO 2 -DEHY stream (≈2700 ppm-mol H 2 O) and TEG solvent (TEG = 98.5%w/w) feed the 15-stage TEG absorber, generating Dry-CO 2 to STR-CO 2 (≈200 ppm-mol H 2 O).…”

Section: Co 2 Dehydration Teg Unit and Co 2 Stripping Gas Unitmentioning

confidence: 99%

Thermodynamic Analysis of Low-Emission Offshore Gas-to-Wire Firing CO2-Rich Natural Gas: Aspects of Carbon Capture and Separation Systems

Reis,

Araújo,

de Medeiros

2024

Gases

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Despite the growth of renewable energy, fossil fuels dominate the global energy matrix. Due to expanding proved reserves and energy demand, an increase in natural gas power generation is predicted for future decades. Oil reserves from the Brazilian offshore Pre-Salt basin have a high gas-to-oil ratio of CO2-rich associated gas. To deliver this gas to market, high-depth long-distance subsea pipelines are required, making Gas-to-Pipe costly. Since it is easier to transport electricity through long subsea distances, Gas-to-Wire instead of Gas-to-Pipe is a more convenient alternative. Aiming at making offshore Gas-to-Wire thermodynamically efficient without impacting CO2 emissions, this work explores a new concept of an environmentally friendly and thermodynamically efficient Gas-to-Wire process firing CO2-rich natural gas (CO2 > 40%mol) from high-depth offshore oil and gas fields. The proposed process prescribes a natural gas combined cycle, exhaust gas recycling (lowering flue gas flowrate and increasing flue gas CO2 content), CO2 post-combustion capture with aqueous monoethanolamine, and CO2 dehydration with triethylene glycol for enhanced oil recovery. The two main separation processes (post-combustion carbon capture and CO2 dehydration) have peculiarities that were addressed at the light shed by thermodynamic analysis. The overall process provides 534.4 MW of low-emission net power. Second law analysis shows that the thermodynamic efficiency of Gas-to-Wire with carbon capture attains 33.35%. Lost-Work analysis reveals that the natural gas combined cycle sub-system is the main power destruction sink (80.7% Lost-Work), followed by the post-combustion capture sub-system (14% Lost-Work). These units are identified as the ones that deserve to be upgraded to rapidly raise the thermodynamic efficiency of the low-emission Gas-to-Wire process.

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Section: Co 2 Dehydration Teg Unit and Co 2 Stripping Gas Unitmentioning

confidence: 99%

Thermodynamic Analysis of Low-Emission Offshore Gas-to-Wire Firing CO2-Rich Natural Gas: Aspects of Carbon Capture and Separation Systems

Reis,

Araújo,

de Medeiros

2024

Gases

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“…2.1.6. CO 2 Compression Units, CO 2 Dehydration Unit and Stripping Gas Unit CU-1 (Figure 7a) is a four-staged intercooled compression train (stage compression ratio ≈ 3) to raise the CO 2 stream pressure up to 50 bar for CO 2 dehydration, favoring water removal [39]. The CO 2 to CDU-TEG stream (≈2730 ppm-mol H 2 O) and TEG solvent (98.5%w/w TEG) feed the 15-staged TEG absorber (Figure 7b), producing dry CO 2 (≈160 ppm-mol H 2 O) for the SGU unit as the top product and rich TEG (H 2 O ≈ 55%mol) as the bottom product.…”

Section: Post-combustion Capture With Aqueous Meamentioning

confidence: 99%

Supercritical Direct-Methane-to-Methanol Coupled with Gas-to-Wire for Low-Emission Offshore Processing of CO2-Rich Natural Gas: Techno-Economic and Thermodynamic Analyses

Reis,

Araújo,

de Medeiros

2024

Processes

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A greater H/C ratio and energy demand are factors that boost natural gas conversion into electricity. The Brazilian offshore pre-salt basin has large reserves of CO2-rich associated gas. Selling this gas requires high-depth long-distance subsea pipelines, making gas-to-pipe costly; in particular, gas-to-wire instead of gas-to-pipe is more practical since it is easier to transmit electricity via long subsea distances. This research proposes and investigates an innovative low-emission gas-to-wire alternative consisting of installing supercritical direct-methane-to-methanol upstream to gas-to-wire, which is embedded in an exhaust-gas recycle loop that reduces the subsequent carbon capture costs. The process exports methanol and electricity from remote offshore oil-and-gas fields with available CO2-rich natural gas, while capturing CO2. Techno-economic, thermodynamic and lost work analyses assess the alternative. Supercritical direct-methane-to-methanol is conducted in supercritical water with air. This route is chosen because supercritical water readily dissolves methanol and CO2, helping to preserve methanol via stabilization against further oxidation by gaseous air. Besides being novel, this process has intensification since it implements exhaust-gas recycle for –flue-gas reduction, CO2 abatement via post-combustion capture with aqueous monoethanolamine, CO2 dehydration with triethylene glycol and CO2 densification for enhanced oil recovery. The process is fed with 6.5 MMS m3/d of CO2-rich natural gas (CO2 > 40%mol) exporting methanol (2.2 t/h), electricity (457.1 MW) and dense CO2 for enhanced oil recovery, with an investment of 1544 MMUSD, 452 MMUSD/y in manufacturing costs and 820 MMUSD/y in revenues, reaching 1021 MMUSD net present value (50 years) and a 10 year payback time. The Second Law analysis reveals overall thermodynamic efficiency of 28%. The lost work analysis unveils the gas-combined-cycle sub-system as the major lost work sink (76% lost work share), followed by the post-combustion capture plant (14% lost work share), being the units that prominently require improvements for better economic and environmental performance. This work demonstrates that the newly proposed process is techno-economically feasible, environmentally friendly, thermodynamically efficient and competitive with the gas-to-wire processes in the literature.

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“…Conventionally, glycols are found in liquid or gel-like products, such as engine coolants, 1 drug delivery media, 2 food additives, 3 and antifreeze or dehydrators. 4 Recently, growing demand for glycols has been found in volatile organic compound-generating (VOC-generating) or inhalable products. 5,6 Ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), and polyethylene glycol (PEG) are common constituents in products including wall paints, 7 artificial fog juice, 8 and perfumes.…”

Section: Introductionmentioning

confidence: 99%

Autoxidation of glycols used in inhalable daily products: implications for the use of artificial fogs and e-cigarettes

Guo,

Chan,

Gautam

et al. 2023

Environ. Sci.: Processes Impacts

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Technical, Economical, and Environmental Performance Assessment of an Improved Triethylene Glycol Dehydration Process for Shale Gas

Cited by 10 publications

References 37 publications

Thermodynamic Analysis of Low-Emission Offshore Gas-to-Wire Firing CO2-Rich Natural Gas: Aspects of Carbon Capture and Separation Systems

Thermodynamic Analysis of Low-Emission Offshore Gas-to-Wire Firing CO2-Rich Natural Gas: Aspects of Carbon Capture and Separation Systems

Supercritical Direct-Methane-to-Methanol Coupled with Gas-to-Wire for Low-Emission Offshore Processing of CO2-Rich Natural Gas: Techno-Economic and Thermodynamic Analyses

Autoxidation of glycols used in inhalable daily products: implications for the use of artificial fogs and e-cigarettes

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