盐效应下 CO ₂ 水合物浆液剪切稀化及 SDS 防聚机制

Shear-thinning behavior of CO ₂ hydrate slurries under salt effects and evolution of SDS anti-agglomeration mechanism

摘要

二氧化碳(CO₂)水合物为碳捕集、利用与封存提供新路径,采用高压流变仪研究水合物体积分数、十二烷基硫酸钠(SDS)及氯化钠对浆液流变行为的影响。结果表明:表观黏度随水合物体积分数增加呈指数上升;体积分数低于34%时黏度变化平缓,超过后颗粒聚集加剧、黏度急剧升高;体积分数在15%~39%内,浆液呈假塑性,稠度系数随体积分数增加呈指数增大,流变指数线性下降;SDS静电排斥作用抑制颗粒聚集,与剪切协同防堵;氯化钠(NaCl)则压缩双电层促进团聚,增大流动阻力,高盐环境下SDS的防聚效果受到抑制。

Abstract

Carbon dioxide (CO ₂) hydrates provide a new pathway for carbon capture, utilization, and storage. A high-pressure rheometer was used to investigate the effects of hydrate volume fraction, sodium dodecyl sulfate (SDS) and sodium chloride (NaCl) on the rheological behavior of the slurries. The results show that the apparent viscosity increases exponentially with increasing hydrate volume fraction. When the volume fraction is below 34%, the viscosity increases moderately. Beyond this threshold, the particle aggregation intensifies, leading to a sharp rise in viscosity. In the range of 15% to 39%, the slurries exhibit pseudoplastic behavior, with the consistency index increasing exponentially and the flow behavior index decreasing linearly as the volume fraction increases. SDS inhibits particle aggregation through electrostatic repulsion, working synergistically with shear to prevent plugging. In contrast, NaCl compresses the electrical double layer, thus promoting agglomeration and increasing flow resistance, indicating that the anti-agglomeration effect of SDS is suppressed in high-salinity environment.

关键词

二氧化碳水合物 / 表观黏度 / 十二烷基硫酸钠 / 氯化钠 / 堵塞防治

Key words

carbon dioxide hydrate / apparent viscosity / sodium dodecyl sulfate / sodium chloride / plugging prevention

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基金资助

辽宁省自然科学基金计划项目(2024-BS-223)

辽宁省教育厅创新团队基金项目(LJ222510148001)