Integration of CO 2 cryogenic removal with a natural gas pressurized liquefaction process using gas expansion refrigeration

Xiong, Xuelian; Lin, Wensheng; Gu, Anzhong

doi:10.1016/j.energy.2015.09.022

Cited by 35 publications

(14 citation statements)

References 29 publications

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“…The Peng−Robinson equation of state is used as the fluid package to calculate the state of each material stream. To optimize the processes, a sequential search method, 12 which is a simple and reliable method, is used in this study. The central concept of a sequential search method is consecutively checking every value in a data list until the desired value is found.…”

Section: Optimization Methodologymentioning

confidence: 99%

“…As a result, pressurized liquefaction is an alternative to liquefy natural gas at much lower energy consumption, with another advantage that more CO 2 will be allowed in the process. 12,13 In this paper, a few pressurized liquefaction processes using two-stage cascade refrigeration cycles are designed, and the liquefaction temperature and pressure of natural gas in the processes are determined to be 165 K and 2 MPa. For a natural gas liquefaction (LNG) process, efficiency and simplicity are always a pair of contradictions.…”

Section: Introductionmentioning

confidence: 99%

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Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Lin

Xiong

Spitoni

et al. 2018

Ind. Eng. Chem. Res.

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Because of increasing interests in offshore natural gas and due to limited deck space, simpler liquefied natural gas processes are necessary. The aim of this paper is to develop three pressurized liquefaction processes using two-stage cascade refrigeration cycles instead of the conventional three-stage refrigeration cycles. The proposed processes are CH4–C2H6, CH4–C2H4, and C2H4–C3H8 processes. Taking the specific energy consumption as the objective function, simulation based optimization is conducted for the three novel processes as well as two conventional cascade processes by a sequential search method. Optimization results show that the C2H4–C3H8 process is the most efficient one with a specific energy consumption of 0.2089 kWh/Nm3, 22% less than that of the conventional CH4–C2H4–C3H8 process. Moreover, a detailed thermodynamic analysis is carried out for the five processes. The thermodynamic analysis results confirm that the C2H4–C3H8 process presents the best composite curve match and the highest coefficient of performance. The CH4–C2H6 process requires the smallest heat transfer area, 70% less than that of the conventional CH4–C2H6–C3H8 process. The CH4–C2H4 process uses the least amount of key equipment, 35% less than that of the conventional CH4–C2H4–C3H8 process. In addition, an exergy analysis is performed for all processes and the results indicate that further improvements are requested the most in valves and heat exchangers, respectively, for the conventional and novel processes.

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Section: Optimization Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Lin

Xiong

Spitoni

et al. 2018

Ind. Eng. Chem. Res.

Self Cite

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“…To optimize these processes for large scale LNG production, a combination of different refrigeration cycles has been developed such as, single mixed refrigerant (SMR), cascade, propane precooled mixed refrigerant (C3MR), and dual mixed refrigerant (DMR) processes. Among these, the SMR and N 2 expander processes offer more simplicity with the lowest amount of capital investment, making them the most feasible for offshore LNG production. ,− The SMR process is highly energy efficient when compared to N 2 expander processes; however, the SMR process has inherent safety and environmental concerns. The presence of highly flammable hydrocarbon based refrigerants makes SMR less attractive due to its environmental hazards and safety concerns.…”

Section: Introductionmentioning

confidence: 99%

Closed-Loop Self-Cooling Recuperative N₂ Expander Cycle for the Energy Efficient and Ecological Natural Gas Liquefaction Process

Qyyum

Qadeer

Lee

2018

ACS Sustainable Chem. Eng.

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Liquefied natural gas (LNG) has attracted global attention as a more environmentally friendly energy source when compared to other fossil fuels. The nitrogen (N2) expander liquefaction is the most green and safe process among the different types of commercial natural gas liquefaction processes, but its relatively low energy efficiency is a major issue. In this study, an innovative closed-loop self-cooling recuperation technology was proposed to reduce the exergy losses of the N2 expander LNG process. The LNG process with the implementation of the proposed technology was modeled using a commercial process simulation tool, ASPEN HYSYS v9. Subsequently, a modified coordinate descent optimization algorithm was employed to achieve maximum potential benefits of the proposed technology. The energy efficiency of the proposed LNG process was further improved by energy recovery from end flash gas and high-pressure natural gas feed. Finally, the energy efficiency of the proposed closed-loop self-cooling recuperative N2 expander LNG process was significantly improved up to 80.5% compared to the existing N2 expander based LNG processes, depending on the feed natural gas conditions, composition, and design parameters.

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“…Therefore, the development of an efficient method of CO 2 capture has become an increasingly important research subject in both academic and industrial fields. The current technologies applied to CO 2 capture include cryogenic processes, chemical solvents, adsorption, and membrane separation . Among these technologies, the adsorption technique has proved to be one of the most promising techniques for reducing CO 2 emissions from fossil fuel combustion.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and CO₂ adsorption behavior of amine‐functionalized porous polystyrene adsorbent

Liu

Chen

Gao

et al. 2017

J of Applied Polymer Sci

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A solid amine adsorbent was prepared by modifying a porous polystyrene resin (XAD‐4) with chloroacetyl chloride through a Friedel–Crafts acylation reaction, followed by aminating with tetraethylenepentamine (TEPA). The adsorption behavior of CO2 from a simulated flue gas on the solid amine adsorbent was evaluated. Factors that could determine the CO2 adsorption performance of the adsorbents such as amine species, adsorption temperature, and moisture were investigated. The experimental results showed that the solid amine adsorbent modified with TEPA (XAD‐4‐TEPA), which had a longer chain, showed an amine efficiency superior to the other two amine species with shorter chains. The CO2 adsorption capacity decreased obviously as the temperature increased because the reaction between CO2 and amine groups was an exothermic reaction, and its adsorption amount reached 1.7 mmol/g at 10 °C in dry conditions. The existence of water could significantly increase the CO2 adsorption amount of the adsorbent by promoting the chemical adsorption of CO2 on XAD‐4‐TEPA. The adsorbent kept almost the same adsorption amount after 10 cycles of adsorption–desorption. All of these results indicated that amine‐functionalized XAD‐4 resin was a promising CO2 adsorbent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45046.

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Integration of CO 2 cryogenic removal with a natural gas pressurized liquefaction process using gas expansion refrigeration

Cited by 35 publications

References 29 publications

Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Closed-Loop Self-Cooling Recuperative N₂ Expander Cycle for the Energy Efficient and Ecological Natural Gas Liquefaction Process

Synthesis and CO₂ adsorption behavior of amine‐functionalized porous polystyrene adsorbent

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Integration of CO 2 cryogenic removal with a natural gas pressurized liquefaction process using gas expansion refrigeration

Cited by 35 publications

References 29 publications

Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Design and Optimization of Pressurized Liquefaction Processes for Offshore Natural Gas Using Two-Stage Cascade Refrigeration Cycles

Closed-Loop Self-Cooling Recuperative N2 Expander Cycle for the Energy Efficient and Ecological Natural Gas Liquefaction Process

Synthesis and CO2 adsorption behavior of amine‐functionalized porous polystyrene adsorbent

Contact Info

Product

Resources

About

Closed-Loop Self-Cooling Recuperative N₂ Expander Cycle for the Energy Efficient and Ecological Natural Gas Liquefaction Process

Synthesis and CO₂ adsorption behavior of amine‐functionalized porous polystyrene adsorbent