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A New Integrated Process for LNG Production Based on the Single Mixed Refrigerant: Energy, Exergy, Environmental and Economic Analysis

  • Research Article-Chemical Engineering
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Abstract

In this study, a new method for the LNG has been proposed based on the SMR process. In the proposed process, an ORC is added to the conventional SMR process and the BOG is used as a coolant in the main heat exchanger. ASPEN HYSYS software utilizing the Peng–Robinson equation of state is used to simulate the SMR and SMR-ORC. The specific energy consumption, total exergy efficiency, and carbon dioxide emissions of the proposed method are compared with the conventional SMR process. Finally, an economic evaluation was performed on both processes. The simulation results showed that in the conventional process the total exergy efficiency and specific energy consumption are 34% and 647 \(\frac{{{\text{kWh}}}}{{{\text{ton}}}}\), respectively, while in the proposed process the total exergy efficiency has reached 39% and the energy consumption is reduced to 472 \(\frac{{{\text{kWh}}}}{{{\text{ton}}}}\). Also, the environmental assessment of carbon dioxide emissions from the production of electrical energy required by pumps and compressors showed that the proposed process has 28.51% less carbon dioxide emissions than the conventional SMR method.

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Abbreviations

APEA:

Aspen Process Economic Analyzer

ACC:

Annual capital cost

BOG:

Boil-off gas

CEPCI:

Chemical engineering price cost index

CWC:

Cold warehouse cooling

C3MR:

Propane precooling mixed refrigerant

DMR:

Dual-mixed refrigerant

FCI:

Total Fixed Capital Investment

h:

Specific enthalpy

IEA:

International energy agency

LNG:

Liquefied natural gas

LHS:

Light hydrocarbon separation

MSMR:

Modified mixed refrigerant liquefaction process

MSMR:

Modified single mixed refrigerant

MR:

Mixed refrigerant

\(n_{{\text{co2,net}}}\) :

Net of carbon dioxide emission

ORC:

Organic Rankine cycle

PNEC:

Parallel nitrogen expansion liquefaction process

SEC:

Specific energy consumption

SMR:

Single mixed refrigerant

s:

Specific entropy

TCOP:

Total cost of production

TAC:

Total annual cost

TEC:

Total major equipment’s purchase cost

VSO:

Vortex search optimization

\(\dot{X}_{{{\text{des}}}}\) :

Exergy destruction

\(\dot{E}_{{\text{D}}}^{{{\text{total}}}}\) :

Total exergy destruction

\(\dot{W}_{{{\text{used}}}}^{{{\text{total}}}}\) :

Tal power consumed

\(\eta_{{{\text{ex}}}}\) :

Exergy efficiency

0 (zero):

Ambient conditions

\(\dot{E}_{{{\text{NG}}}}\) :

Exergy of natural gas

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Author information

Authors and Affiliations

  1. Department of Process Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

    Mohammad Shamsi

  2. Department of Chemical Engineering, Ilam University, Ilam, Iran

    Muhammadsaeed Rahimi

  3. College of Engineering, University of Texas at Tyler, Tyler, Texas, USA

    Michael Sheidaei

  4. Department of Chemical Engineering, Semnan University, Semnan, Iran

    Seyed Hamid Majidi Dorcheh

  5. Department of Chemical Engineering, Yasouj University, Yasouj, Iran

    Mohammad Bonyadi

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  1. Mohammad Shamsi
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  2. Muhammadsaeed Rahimi
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Correspondence to Mohammad Shamsi.

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Shamsi, M., Rahimi, M., Sheidaei, M. et al. A New Integrated Process for LNG Production Based on the Single Mixed Refrigerant: Energy, Exergy, Environmental and Economic Analysis. Arab J Sci Eng 48, 15805–15821 (2023). https://doi.org/10.1007/s13369-023-07659-2

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