ABSTRACT
With the exploitation of oil and gas resources in the ocean, the application of FLNG is more and more extensive. The FLNG ships will face with sloshing, which will exert an influence on the performance of the system. In order to study the effect of sloshing on the double mixed refrigerant liquefaction process, a sloshing platform of six degrees of freedom is built to perform the sloshing experiment of DMR system. The experimental on yaw, roll and pitch is carried out by measuring the temperature, pressure, flow and pressure difference at key nodes to analyze the effects of three different sloshing forms on the overall liquefaction performance and the equipment. It can be found that sloshing will reduce liquefaction performance and increase power consumption. The sloshing has an adverse effect on the distribution of fluid in the heat exchanger and reduces the heat transfer effect. In addition, the sloshing has a greater impact on the wound tube heat exchanger than the plate fin heat exchanger. The effect of the yaw is negligible and the effect of the roll is biggest. The research results can provide reference and guidance for offshore FLNG production.
Notations
Ta1 | = | Temperature of feed gas after plat fin heat exchanger |
Ta2 | = | Temperature of precooling refrigerant before throttling |
Ta3 | = | Temperature of precooling refrigerant after throttling |
Tb1 | = | Temperature of feed gas after wound tube heat exchanger |
Tb2 | = | Temperature of feed gas before wound tube heat exchanger |
Tb3 | = | Temperature of cryogenic refrigerant before throttling |
Tb4 | = | Temperature of cryogenic refrigerant after throttling |
Tc | = | Temperature of feed gas after throttling |
Pa1 | = | Pressure of precooling refrigerant at the outlet of throttling |
Pa2 | = | Pressure of precooling refrigerant at the inlet of throttling |
Pa3 | = | Pressure of precooling refrigerant at the outlet of precooling compressor |
Pd1 | = | Pressure drop of plat fin heat exchanger |
Pd2 | = | Pressure drop of wound tube heat exchanger |
Pb1 | = | Pressure of cryogenic gas refrigerant at the outlet of throttling |
Pb2 | = | Pressure of cryogenic gas refrigerant at the inlet of throttling |
Pb3 | = | Pressure of cryogenic liquid refrigerant at the outlet of throttling |
Pb4 | = | Pressure of cryogenic liquid refrigerant at the inlet of throttling |
Pc1 | = | Pressure of feed gas at the inlet of throttling |
Pc2 | = | Pressure of feed gas at the outlet of throttling |
Q1 | = | Flow rate of precooling refrigerant |
Q2 | = | Flow rate of cryogenic refrigerant |
Q3 | = | Flow rate of feed gas |
= | Resistance loss, m; | |
= | Resistance coefficient; | |
= | Pipe length, m; | |
= | Pipe diameter, m; | |
= | Fluid velocity, m/s; | |
= | Acceleration of gravity, m/s2; | |
= | Power consumption of precooled compressor, kW; | |
= | Power consumption of cryogenic compressor, kW; | |
= | Feed gas flow rate, Nm3. |
Additional information
Funding
Notes on contributors
Xueyu Chang
Xueyu Chang, Assistant Engineer, is mainly engaged in liquefied natural gas and turbomachinery.
Yuxing Li
Yuxing Li, Professor, is mainly engaged in LNG and oil and gas gathering and transportation.
Jianlu Zhu
Jianlu Zhu, Ph.D., is mainly engaged in liquefied natural gas and heat transfer research.
Xuehui Zhang
Xuehui Zhang, Ph.D., Senior Engineer, is mainly engaged in residual pressure recovery and turbomachinery.
Wen. Li
Wen. Li, Ph.D., Professor, is mainly engaged in the research of turbomachinery.
Chao. Wang
Chao. Wang, Engineer, is mainly engaged in heat transfer research.
Haisheng Chen
Haisheng Chen, Professor, is mainly engaged in energy storage system and turbomachinery research.
Jie Chen
Jie Chen, Vice Chief Engineer, is mainly engaged in liquefied natural gas (LNG) and offshore FLNG research.
Weiping Zeng
Weiping Zeng, Engineer, is mainly engaged in liquefied natural gas and offshore FLNG research.