非成岩水合物单喷嘴射流破碎规律实验研究

来源期刊:中南大学学报(自然科学版)2021年第2期

论文作者:钟林 张计春 王国荣 王雷振 李清平 付强 何玉发 陈雨

文章页码:607 - 614

关键词:非成岩水合物;替代样;单喷嘴;破碎深度;破碎体积

Key words:non-diagenetic gas hydrate; substitute sample; single nozzle; crushing depth; crushing volume

摘    要:为了提高单喷嘴射流破碎采掘水合物的效率,推进海洋非成岩水合物固态流化开采的商业化进程,基于非成岩水合物替代试样,设计非成岩天然气水合物单喷嘴射流破碎实验方案,搭建单喷嘴射流破碎实验系统,研究射流时间、射流靶距、射流压力和喷嘴水平段直径等因素对替代样射流破碎深度和破碎体积的影响。研究结果表明:在所设的实验条件下,随时间增加,水合物破碎深度和破碎体积呈先增大后趋于平稳的趋势,水射流作用下达到极限破碎深度的时间为30 s;破碎体积和破碎深度与射流靶距呈反比例关系,与射流压力呈近似二次方正比例关系;破碎深度与水平段直径呈正比例线性关系,破碎体积与水平段直径呈二次方关系;在射流压力和直径的影响下,破碎相同体积所需要的耗能分别为0.91 W/cm3和2.85 W/cm3,射流压力对非成岩水合物的射流破碎影响更大。该研究为海洋非成岩水合物的固态流化射流破碎缩扩型单喷嘴的设计及优化提供了实验依据。

Abstract: In order to improve the efficiency of single nozzle jet breaking and extracting hydrate and promote the commercialization process of marine non-diagenetic gas hydrate solid-state fluidization mining, the experiment scheme of non-diagenetic gas hydrate single nozzle jet breaking was designed based on the non-diagenetic gas hydrate substitute sample. The experiment system of single nozzle jet breaking was built. The effects of jet time, jet target distance, jet pressure and the diameter of horizontal section on the jet crushing depth and crushing volume were studied. The results show that the hydrate breaking depth and volume increase first and then tend to be stable with the passage of time under the experimental conditions, and the time to reach the limit breaking depth during water jet is 30 s. The crushing volume and depth are inversely proportional to the jet target distance and approximately quadratic square proportional to the jet pressure. The crushing depth has a positive proportional linear relationship with the horizontal section diameter and the crushing volume has a quadratic relationship with the horizontal section diameter. Under the influence of jet pressure and diameter, the energy dissipations of breaking the same volume of sample are 0.91 W/cm3 and 2.85 W/cm3, respectively, so the jet pressure has a greater influence on the jet breakage of Non-diagenetic gas hydrate. This study provides experimental basis for the design and optimization of a single nozzle of a solid-state fluidized jet with non-diagenetic gas hydrate.

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