Numerical Investigations on Boil-Off Gas Generation Characteristics of LCO<sub>2</sub> in Type C Storage Tanks Under Different Sloshing Conditions

Numerical Investigations on Boil-Off Gas Generation Characteristics of LCO<sub>2</sub> in Type C Storage Tanks Under Different Sloshing Conditions

Marine transportation of liquefied carbon dioxide (LCO<sub>2</sub>) is crucial for Carbon Capture, Transportation, Utilization, and Storage (CCTUS) technology, aiding in CO<sub>2</sub> emission reduction and greenhouse effect control. This study investigates the thermodynamic...

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Bibliographic Details
Main Authors: Mengke Sun, Zhongchao Zhao, Jiwei Gong
Format: Article
Language:English
Published: MDPI AG 2025-05-01
Series:Applied Sciences
Subjects:
carbon dioxide cargo
BOG
fluid dynamics
numerical simulation
Online Access:https://www.mdpi.com/2076-3417/15/10/5788
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Summary:Marine transportation of liquefied carbon dioxide (LCO<sub>2</sub>) is crucial for Carbon Capture, Transportation, Utilization, and Storage (CCTUS) technology, aiding in CO<sub>2</sub> emission reduction and greenhouse effect control. This study investigates the thermodynamic and fluid dynamic characteristics of LCO<sub>2</sub> in Type C storage tanks using numerical simulations, focusing on heat transfer, flow phenomena, and boil-off gas (BOG) generation under varying storage pressures. Results show that heated liquid rises along the tank wall, forming vortices, while gas-phase vortices are driven by central upward airflow. Over time, liquid velocity near the wall increases, enhancing flow field mixing. Gas-phase temperatures rise significantly, while liquid-phase temperature gradients remain minimal. Higher storage pressures reduce fluid velocity, vortex range, and thermal response speed. BOG generation is higher at low pressures and decreases as pressure rises, slowing beyond 1.5 MPa. Under sloshing conditions, interfacial fluctuations enhance heat and mass transfer, reducing thermal stratification. Resonance periods amplify interfacial disturbances, improving thermal mixing and minimizing temperature gradients (ΔT ≈ 0.1 K). Higher filling rates suppress surface rupture, while lower rates exhibit gas-dominated instabilities and larger thermal gradients (ΔT ≈ 0.3 K).
ISSN:2076-3417

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