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| Study on Flow Characteristics of Multiphase Flow in Internal Transport of Hydrate Phase Transition |
| TAO Junao1,ZHANG Huoming1,CHEN Guoqing2,LU Pinglan3 |
1. Zhejiang Provincial Key Laboratory of Flow Metering Technology, China Jiliang University, Hangzhou, Zhejiang,310018, China
2. Zhejiang Academy of Special Equipment Science, Hangzhou, Zhejiang,310020, China
3. Engineering Training Center, China Jiliang University, Hangzhou, Zhejiang, 310018, China |
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Abstract The natural hydrate will decompose due to the change of pressure during the lifting process of the flexible riser, and the phase change process will flow from the solid-liquid two-phase flow at the bottom of the riser to the gas-liquid-solid three-phase flow at the top of the riser. Based on the computational fluid dynamics (CFD) method, the catenary linear flexible riser model was established by FLUENT, and the Euler multiphase flow model was used to simulate the hydrate decomposition process by combining the UDF source term, and the flow characteristics of hydrate in the riser under different influencing parameters were obtained. The results show that the increase of particle volume fraction and suspension angle can increase the gas holding capacity in the riser, thereby reducing the energy consumption of hydrate transportation. The increase of inlet speed can increase the particle velocity at the outlet of the riser, so that the gas holding rate in the pipeline is reduced, and the increase of speed will increase the energy consumption of the required pump. The increase of particle volume fraction increases the gas holding rate in the riser, and the energy consumption of the required pump first decreases and then increases, there is an optimal value for particle volume fraction. In the actual project, the purpose of reducing energy consumption can be achieved by adjusting the relevant parameters according to needs.
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Received: 17 October 2023
Published: 05 September 2024
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2024, Vol. 45 
