Application of Simplified Thermal Transfer Analysis in FLNG Tank Optimization
- Xiaosong ZHU (CNOOC Research Institute Ltd.) | Xuliang HAN (CNOOC Research Institute Ltd.) | Bin XIE (CNOOC Research Institute Ltd.) | Junrong WANG (CNOOC Research Institute Ltd.) | Xicong YU (CNOOC Research Institute Ltd.)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- FLNG, Thermal Transfer Analysis, Cargo Containment System
- 1 in the last 30 days
- 24 since 2007
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For the demand of FLNG evacuation during typhoon and other harsh environmental conditions, a proposed simplified thermal transfer analysis method is used to study the temperature field of FLNG membrane tank in this paper. Firstly, the theoretical model and numerical model of proposed method are introduced. Secondly, the temperature distribution of the LNG chamber during the on and off of the heating system is analyzed. Then, two main factors that affect the temperature field of FLNG membrane tank are analyzed, including the spacing between the double-row tanks and the water injection in the midlongitudinal compartment. The results shows that with the increasing of the distance of double-row tanks and filling more water in the longitudinal compartment, the lowest temperature of the tank hull structure increase. In addition, the growth rate the lowest temperature is gradually reduced. Finally, the advantages and disadvantages of these two methods to increase tank temperature are analyzed. The conclusion of this paper has a certain guiding effect on the optimal design of FLNG tank.
As one of the most promising gas field development modes in South China Sea, Floating Liquefied Natural Gas (FLNG) has aroused more and more concerned. As we all known, the temperature of Liquefied Natural Gas (LNG) is as low as −162 degree Celsius, which makes the structural optimization of LNG tank essentially important for the entire FLNG.
FLNG is a relatively new device for gas field development, including production, liquefaction, storage and offloading modules, which is one of the hottest research areas in recent years. For deep sea gas field, especially far away from land, FLNG is one of the most potential development modes. Currently, PFLNG1 of PETRONAS had been deployed in Kanowit field in 2017. Prelude FLNG of SHELL will put into operation soon.
Normally, at atmospheric pressure condition, the natural gas will convert from gaseous phase to liquid phase through cooling it down to −162 degree Celsius, which is called Liquefied Natural Gas (LNG). The main component of LNG is methane, which is colorless, tasteless, non-toxic and non-corrosive. For the same weight, the volume of LNG is about 1/600 of gaseous phase. Its density is only 45% of pure water. Due to the extremely low LNG temperature, if it contacts the hull directly, it may cause severe damage to the hull structure or even damage to the safe of FLNG. Therefore, FLNG device sets very high standards for the insulation, hull structure, heating system and construction technology of tank containment system, making it become an essential part of FLNG.
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