Influence of Sloshing Conditions on the Pressure Drop and Heat Transfer of a Single-Layer Spiral-Wound LNG Heat Exchanger

Dong, Longfei; Wu, Xiao; Liu, Kun; Sun, Qichen

doi:10.1021/acsomega.3c00010

Cited by 4 publications

(3 citation statements)

References 24 publications

(27 reference statements)

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“…The experiment adopted the dual mixed refrigerant refrigeration process, as shown in Figure ; the experimental device was divided into three modules: the raw gas gasification and compression, precooling compression, and cryogenic compression modules. In the experimental process, the precooling and cryogenic heat transfer parts of the double-mixed refrigerant system were placed on a sloshing platform for the relevant sloshing experiments.…”

Section: Experimental Device and Measurement Deviationmentioning

confidence: 99%

Experimental Study on the Effect of Pitch Sloshing on the Heat Transfer and Pressure Drop of an LNG Spiral-Wound Heat Exchanger

Dong¹,

Hao²,

Wu³

et al. 2023

ACS Omega

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With the development and utilization of offshore liquefied natural gas, it is increasingly important to study the influence of the heat transfer performance of a spiral-wound heat exchanger under sloshing conditions. This study focused on the effects of different sloshing amplitudes and sloshing periods on the heat transfer and pressure drop performance of a heat exchanger. Through experimental research, the results showed that the fluctuation of the UA (U is the heat transfer coefficient; A is the heat exchange area) value first increased and then decreased with an increase in the sloshing amplitude. The UA value increased by 12.92% and decreased by 42.03% compared to the static value at 3 and 9°, respectively. The fluctuation in the UA value first decreased and then increased with an increase in the sloshing period. The UA value decreased by 36.66% and increased by 10.82% slowly compared to the static value when the sloshing period was 6 and 20 s, respectively. Based on this, a mathematical model of heat transfer under the condition of pitch sloshing was established.

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Section: Experimental Device and Measurement Deviationmentioning

confidence: 99%

Experimental Study on the Effect of Pitch Sloshing on the Heat Transfer and Pressure Drop of an LNG Spiral-Wound Heat Exchanger

Dong¹,

Hao²,

Wu³

et al. 2023

ACS Omega

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“…When SHE is utilized in the FLNG industry, the heat exchanger is subject to tilting, swaying, and fluctuation due to the influence of oceanic conditions. This can have a significant impact on the stability and internal flow of SHE, and the existing correlations of frictional pressure drop are inadequate in predicting the frictional pressure drop in the tube [22]. To ensure the proper functioning of the equipment, it is necessary to conduct research on the two-phase flow characteristics under offshore conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow and Pressure Drop on Tube Side of Spiral Tube Heat Exchanger under Sloshing Conditions

Tian

Jiang

et al. 2023

Energies

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The utilization of the spiral tube heat exchanger (SHE) has become increasingly prevalent in large-scale liquefaction processes. However, the flow pattern and frictional pressure drop of two-phase flow in the spiral tube have been scarcely studied, particularly under offshore sloshing conditions. An experimental system had been developed to explore the flow pattern and frictional pressure drop characteristics of mixed hydrocarbon fluid in a spiral tube. Moreover, these have been developed in order to examine the effects of sloshing style (roll, pitch, heave), sloshing period (5–15 s), sloshing amplitude (5–15° or 50–150 mm), mass flux (200–800 kg/(m2·s)), vapor quality (0–1), and saturation pressure (2–4 MPa) on the frictional pressure drop of methane/ethane mixture in the spiral tube. The results indicated that sloshing conditions reduce the frictional pressure drop, thereby enhancing fluid flow. A correlation was established to predict the sloshing factor of frictional pressure drop, and the MARD under verification conditions was 6.04%. Furthermore, three flow pattern boundaries were proposed based on We* as an indicator.

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“…The fluctuation in the pressure drop was the largest under compound heaving and pitching conditions. Dong et al [ 26 ] conducted experimental research on the rolling, pitching, yawing, and other sloshing conditions. Pitching was found to have the most significant influence on the heat transfer performance of the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of heat transfer performance of spiral wound heat exchanger under sloshing condition

Dong,

2023

PLoS ONE

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LNG floating production storage and offloading (FPSO) unit is a new type of floating production unit developed for offshore natural gas fields. It performs the functions of natural gas extraction, pretreatment, liquefaction, and storage. In this study, the heat transfer characteristics of a spiral-wound heat exchanger were studied using numerical simulations, which provides a basis for equipment selection and structural optimization of spiral-wound heat exchangers. The main research contents and conclusions are as follows. Under land-based simulation conditions, the heat transfer coefficient of the shell side of the spiral-wound heat exchanger decreases with an increase in the winding angle of the heat exchange tube, decreases with an increase in the spacing of the heat exchange tube, and increases with an increase in the outer diameter of the heat exchange tube. When the winding angle increased from 5° to 8°, the heat transfer coefficient decreased by 6.70%. The heat transfer coefficient of the shell side decreased by 13.21% when the heat exchange tube spacing increased from 14 to 17 mm. The heat transfer coefficient of the shell side increased by 22.89% when the outer diameter of the heat exchange tube increased from 9 to 12 mm. When the sloshing angle is constant, the heat transfer coefficient of the spiral-wound heat exchanger decreases with an increase in the winding angle and spacing of the heat exchange tubes, and increases with an increase in the outer diameter of the heat exchange tubes. When the structural parameters of the heat exchanger are constant, the heat transfer coefficient decreases as the sloshing angle increases. When the sloshing angle was less than 3°, the sloshing promoted heat transfer on the shell side. When the sloshing angle was higher than 7°, the heat transfer effect of the shell side deteriorated considerably, which weakened the heat transfer performance of the heat exchanger. When the sloshing period is constant, the heat transfer coefficient of the wound heat exchanger decreases with an increase in the winding angle and spacing of the heat exchange tubes, and increases with an increase in the outer diameter of the heat exchange tubes. When the structural parameters of the heat exchanger are constant, the heat transfer coefficient increases with sloshing period. When the sloshing period was greater than 15 s, the influence of sloshing on the heat transfer on the shell side of the heat exchanger was relatively weak.

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Influence of Sloshing Conditions on the Pressure Drop and Heat Transfer of a Single-Layer Spiral-Wound LNG Heat Exchanger

Cited by 4 publications

References 24 publications

Experimental Study on the Effect of Pitch Sloshing on the Heat Transfer and Pressure Drop of an LNG Spiral-Wound Heat Exchanger

Experimental Study on the Effect of Pitch Sloshing on the Heat Transfer and Pressure Drop of an LNG Spiral-Wound Heat Exchanger

Analysis of Flow and Pressure Drop on Tube Side of Spiral Tube Heat Exchanger under Sloshing Conditions

Numerical simulation of heat transfer performance of spiral wound heat exchanger under sloshing condition

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