Energy Saving through Efficient BOG Prediction and Impact of Static Boil-off-Rate in Full Containment-Type LNG Storage Tank

Mohd Shariq Khan, Muhammad Abdul Qyyum, Wahid Ali, Aref Wazwaz, Khursheed B. Ansari and Moonyong Lee
Additional contact information
Mohd Shariq Khan: Department of Chemical Engineering, College of Engineering, Dhofar University, Salalah 211, Oman
Muhammad Abdul Qyyum: Department of Chemical Engineering, Yeungnam University, Dae-dong 712-749, Korea
Wahid Ali: Department of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Jazan 45142, Saudi Arabia
Aref Wazwaz: Department of Chemical Engineering, College of Engineering, Dhofar University, Salalah 211, Oman
Khursheed B. Ansari: Department of Chemical Engineering, Zakir Husain College of Engineering and Technology, Aligarh Muslim University, Aligarh 202001, India
Moonyong Lee: Department of Chemical Engineering, Yeungnam University, Dae-dong 712-749, Korea

Energies, 2020, vol. 13, issue 21, 1-14

Abstract: Boil-off gas (BOG) from a liquefied natural gas (LNG) storage tank depends on the amount of heat leakage however, its assessment often relies on the static value of the boil-off rate (BOR) suggested by the LNG tank vendors that over/under predicts BOG generation. Thus, the impact of static BOR on BOG predictions is investigated and the results suggest that BOR is a strong function of liquid level in a tank. Total heat leakage in a tank practically remains constant, nonetheless the unequal distribution of heat in vapor and liquid gives variation in BOR. Assigning the total tank heat leak to the liquid is inappropriate since a part of heat increases vapor temperature. At the lower liquid level, BOG is under-predicted and at a higher level, it is over-predicted using static BOR. Simulation results show that BOR varies from 0.012 wt% per day for an 80% tank fill to 0.12 wt% per day at 10% tank fill.

Keywords: natural gas; liquefaction; regasification; LNG storage tank; BOG; BOR (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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