Optimization and Economic Analysis for Small-Scale Movable LNG Liquefaction Process with Leakage Considerations

Sang Hyun Lee,Dong-Ha Lim,Kyungtae Park

doi:10.3390/app10155391

Sang Hyun Lee, Dong-Ha Lim + Show 1 more

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https://doi.org/10.3390/app10155391

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Abstract

In this study, exergy and economic analysis were conducted to gain insight on small-scale movable LNG liquefaction considering leakage. Optimization and comparison were performed to demonstrate the quantitative results of single mixed refrigerant, dual nitrogen expansion, and the propane pre-cooling self-refrigeration processes. For the optimization, exergy efficiency was used as the objective function; the results showed that exergy efficiencies are 38.85%, 19.96%, and 13.65%, for single mixed refrigerant, dual nitrogen expansion, and propane pre-cooling self-refrigeration, respectively. Further, the cost analysis showed that the product cost of each process is 4002.3 USD/tpa, 5490.2 USD/tpa, and 9608.5 USD/tpa. A sensitivity analysis was conducted to determine parameters that affect exergy and cost. The SMR process is the most competitive in terms of exergy efficiency, product cost, and operability, without considering makeup facilities.

Highlights

Energy demand has gradually increased from the last decade because of the economic development and population growth around the world [1]
Liquefied natural gas (LNG) is becoming a primary energy resource in the global energy market owing to its cleanness, ease of transportability, and lower greenhouse gas emissions compared to other fossil fuels [2]
This paper presents a quantitative investigated for a small-scale movable plant considering the compressor leakage

Summary

Introduction

Energy demand has gradually increased from the last decade because of the economic development and population growth around the world [1]. Liquefied natural gas (LNG) is becoming a primary energy resource in the global energy market owing to its cleanness, ease of transportability, and lower greenhouse gas emissions compared to other fossil fuels [2]. These positive advantages of LNG have attracted considerable attention in view of the current energy crisis. Liquefying natural gas and pipeline transportation are two major methods for transporting natural gas. The pipeline method is not economical for long-distance transportation because of unstable gas flow rates [3]. Liquefying natural gas can be the best method to transport natural gas across the ocean

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