SDBS和SDS对深层煤层注水效果研究,Science of the Total Environment

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SDBS和SDS对深层煤层注水效果研究
Science of the Total Environment ( IF 8.2 ) Pub Date : 2022-09-28 , DOI: 10.1016/j.scitotenv.2022.158930
Lianman Xu ₁ , Yajing Li ₁ , Linlin Du ₁ , Fengshuo Yang ₁ , Runjie Zhang ₁ , Hao Wei ₁ , Gang Wang ₁ , Zhe Hao ₁

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煤层注水作为煤炭开采过程中重要的防灾手段，可以有效抑制煤尘，添加注水添加剂，可以有效改善煤体的润湿性，提高煤体的渗透性，从而达到预防岩爆。煤层注水时为了改善煤的润湿性，常在水中添加表面活性剂，但十二烷基苯磺酸钠（SDBS）和十二烷基硫酸钠（SDS）在注水改善深层煤层润湿性方面存在局限性。因此，确定SDBS和SDS的影响因素对于改善煤的润湿性具有重要意义。本文揭示了煤中含氧官能团和矿物质对煤润湿性的影响，并从微观角度阐述了SDBS和SDS的润湿机理。利用SEM表征煤表面与表面活性剂的相互作用，利用接触角实验验证煤中矿物质对润湿性的影响。采用电感耦合等离子体原子发射光谱（ICP）和动态光散射（DLS）测试表征了SDBS、SDS与矿物的相互作用以及SDBS、SDS与矿物离子相互作用产生的沉淀的大小。结果表明，SDBS和SDS与Ca相互作用产生沉淀，阻碍煤中水的流动，在一定程度上不利于改善深层煤层的润湿性。螯合剂与Ca显着的螯合作用为这一问题提供了可行的解决方案。

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Study on the effect of SDBS and SDS on deep coal seam water injection

Coal seam water injection, as an important disaster prevention means in the process of coal mining, can effectively suppress coal dust, add water injection additives, can effectively improve the wettability of coal body, improve the permeability of coal body, so as to achieve the prevention of rock burst. To improve the wettability of coal in coal seam water injection, the surfactant is often added to water, but sodium dodecyl benzene sulfonate (SDBS) and sodium dodecyl sulfate (SDS) have limitations in improving wettability of deep coal seam by injecting water. Therefore, it is very important to determine the influencing factors of SDBS and SDS to improve the wettability of coal. In this paper, the effects of oxygen-containing functional groups and minerals in coal on the wettability of coal are revealed, and the wettability mechanism of SDBS and SDS is expounded from the microscopic point of view. SEM was used to characterize the interaction between coal surface and surfactant, and the contact angle experiment was used to verify the influence of minerals in coal on wettability. Inductively coupled plasma atomic emission spectroscopy (ICP) and dynamic light scattering (DLS) tests were used to characterize the interaction of SDBS, SDS with minerals and the size of precipitation generated by the interaction of SDBS, SDS and mineral ions. The results showed that SDBS and SDS interact with Ca to produce precipitation and block the flow of water in coal, which is not conducive to improving the wettability of deep coal seam to a certain extent. The significant chelating effect of chelating agent and Ca provides a feasible solution to this problem.

更新日期：2022-09-28

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