AUTHOR=Wei Na , Qiao Yi , Liu Anqi , Zhao Jinzhou , Zhang Liehui , Xue Jin 

TITLE=Study on structure optimization and applicability of hydrocyclone in natural gas hydrate exploitation

JOURNAL=Frontiers in Earth Science

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.991208

DOI=10.3389/feart.2022.991208

ISSN=2296-6463

ABSTRACT=<p>With the development of economy and industry, the consumption of fossil energy is gradually increasing. Currently, natural gas hydrates (NGH) are considered to be an ideal alternative energy due to its large reserve and high energy density. However, the separation of hydrate slurry is a critical step in the exploitation of NGH. In this study, the optimization of the structural parameters based on the conventional three-phase hydrocyclone was carried out using numerical simulation and orthogonal design. At the same time, the separation efficiency criterion <italic>E</italic> was defined to evaluate the separation efficiency by calculating the sum of the discharge efficiency of water and gas. Analysis of the effect of individual structural factors on the flow field distribution characteristics inside the hydrocyclone using the single factor analysis method. The results showed that: with the combination of structural parameters of <italic>s</italic> was 2 mm<sup>2</sup> × 12 mm<sup>2</sup>, <italic>d</italic><sub>z</sub> was 28 mm, <italic>h</italic> was 20 mm, and <italic>l</italic><sub>i</sub> was 28 mm, the maximum <italic>E</italic> of the three-phase hydrocyclone was 1.46. The effect significance of each structural parameter on the separation efficiency from the highest to the lowest was the <italic>s</italic>, <italic>d</italic><sub>z</sub>, <italic>h,</italic> and <italic>l</italic><sub>i</sub>. In the single-factor analysis, when the <italic>s</italic> was 2 mm<sup>2</sup> × 12 mm<sup>2</sup>, the tangential velocity, axial velocity, and CH<sub>4</sub> volume fraction in the flow field reached the maximum of 13.65 m/s, 4.35 m/s, and 12.4%, respectively. But the minimum water phase volume fraction was 69.9% under this structural parameter condition. When the <italic>d</italic><sub>z</sub> was 36 mm, the maximum decrease value of axial velocity in the flow field was 3.57 m/s, the maximum CH<sub>4</sub> volume fraction was 12.4%, and the water volume fraction reached a minimum of 66.3%. The <italic>l</italic><sub>i</sub> and the <italic>h</italic> only had significant effects on the axial velocity and the water volume fraction, respectively. The axial velocity reached a maximum of 4.75 m/s when the <italic>l</italic><sub>i</sub> was 32 mm, and the water phase volume fraction reached a maximum of 77.9% when the <italic>h</italic> was 10 mm. The study of the structural parameters and flow field characteristics of this three-phase hydrocyclone applicable to the solid fluidization exploitation of NGH provides some guidance and suggestions for the separation of hydrate slurry after solid fluidization exploitation of NGH.</p>