Development in Mixed Refrigerant Cycles Used in Olefin Plants

Mafi, Mostafa; Amidpour, Majid; Naeynian, S.M. Mousavi

doi:10.1016/b978-0-444-53292-3.50021-3

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…If the initial gas temperature is lower than the maximum inversion temperature (μ JT = 0) then the temperature decreases as a result of the choking process. For all gases (except helium, H 2 , and Ne), the peak inversion temperature is higher than the environment. , Therefore, to decrease the H 2 temperature using the J–T process, it is necessary to first cool its temperature to less than the H 2 inversion temperature (205 K). As a result, H 2 gas cannot be liquefied at ambient temperature only by using the J–T process, and a precooling process is necessary …”

Section: Description Of Liquid Hydrogen Technologiesmentioning

confidence: 99%

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

et al. 2023

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The main challenges of liquid hydrogen (H2) storage as one of the most promising techniques for large-scale transport and long-term storage include its high specific energy consumption (SEC), low exergy efficiency, high total expenses, and boil-off gas losses. This article reviews different approaches to improving H2 liquefaction methods, including the implementation of absorption cooling cycles (ACCs), ejector cooling units, liquid nitrogen/liquid natural gas (LNG)/liquid air cold energy recovery, cascade liquefaction processes, mixed refrigerant systems, integration with other structures, optimization algorithms, combined with renewable energy sources, and the pinch strategy. This review discusses the economic, safety, and environmental aspects of various improvement techniques for H2 liquefaction systems in more detail. Standards and codes for H2 liquefaction technologies are presented, and the current status and future potentials of H2 liquefaction processes are investigated. The cost-efficient H2 liquefaction systems are those with higher production rates (>100 tonne/day), higher efficiency (>40%), lower SEC (<6 kWh/kgLH2), and lower investment costs (1–2 $/kgLH2). Increasing the stages in the conversion of ortho- to para-H2 lowers the SEC and increases the investment costs. Moreover, using low-temperature waste heat from various industries and renewable energy in the ACC for precooling is significantly more efficient than electricity generation in power generation cycles to be utilized in H2 liquefaction cycles. In addition, the substitution of LNG cold recovery for the precooling cycle is associated with the lower SEC and cost compared to its combination with the precooling cycle.

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Section: Description Of Liquid Hydrogen Technologiesmentioning

confidence: 99%

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

et al. 2023

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“…Typically, in conventional olefin plants, propene refrigeration cycles (assumed as "Refrigerant 1") are used to cool streams to −35 °C and ethene refrigeration (assumed as "Refrigerant 4") is utilised to cool to around −100 °C. 81 Therefore, literature was sought to find both the energy source and intensity of such refrigeration cycles.…”

Section: Life-cycle Assessment (Lca)mentioning

confidence: 99%

Production of propane and propene via carbon capture utilisation: comparison of its environmental and economic performance against conventional production methods

2023

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“…Ethylene plants are important industrial plants where paraffin feedstocks such as ethane, propane and naphtha are processed and converted into ethylene. The ethylene production is economically important but highly energy-intensive process [42]. Steam cracking of naphtha at high temperatures is the most common method for ethylene production.…”

Section: Ethylene Plant and Liquid Emissionsmentioning

confidence: 99%

Heat exchanger application for environmental problem-reducing in flare systems of an oil refinery and a petrochemical plant: Two case studies

Jokar

Rahimpour

Shariati

2016

Applied Thermal Engineering

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Development in Mixed Refrigerant Cycles Used in Olefin Plants

Cited by 9 publications

References 4 publications

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

Production of propane and propene via carbon capture utilisation: comparison of its environmental and economic performance against conventional production methods

Heat exchanger application for environmental problem-reducing in flare systems of an oil refinery and a petrochemical plant: Two case studies

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