Heating Value Reduction of LNG (Liquefied Natural Gas) by Recovering Heavy Hydrocarbons: Technoeconomic Analyses Using Simulation-Based Optimization

by Iftekhar Abubakar KARIMI
Heating Value Reduction of LNG (Liquefied Natural Gas) by Recovering Heavy Hydrocarbons: Technoeconomic Analyses Using Simulation-Based Optimization

LNG is expected to play a major role in global natural gas trade. Implementing a heating value adjustment unit within regasification terminal allows importing of LNG from diverse sources around the world, thus increasing the energy security of the importing country. In this study, we have developed a superstructure for heavy hydrocarbons removal (HHR) as a strategy to reduce the heating value of LNG to meet desired specifications. We present a simulation-based optimization paradigm to evaluate the techno-economic feasibility of the HHR process for any given LNG feed within a regasification terminal. The optimal HHR process not only adjusts the heating value of LNG but also produces ethane and LPG as co-products. Our analyses show that at current prices of co-products, the HHR process yields a profit of about 7 − 10 % depending on the heating value of imported LNG feed.

This work has been published in Industrial & Engineering Chemistry Research (I&ECR) on February 20, 2018 (doi: 10.1021/acs.iecr.7b04311).

Corresponding author(s): Iftekhar Abubakar Karimi (cheiak@nus.edu.sg),  Shamsuzzaman Farooq (chesf@nus.edu.sg)

Corresponding author(s) webpage: http://www.chbe.nus.edu.sg/faculty/cheiak,  http://www.chbe.nus.edu.sg/faculty/chesf