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煤层注入活性液不仅能改善煤体的润湿性，还会影响煤中瓦斯放散特性。为了探究十二烷基活性剂对构造煤瓦斯扩散的抑制效应，开展了构造煤外加不同质量分数的十二烷基苯磺酸钠(Sodium Dodecyl Benzene Sulfonate, SDBS)与十二烷基硫酸钠(Sodium Dodecyl Sulfate, SDS)单一及复配活性剂溶液的瓦斯扩散试验，分析了不同活性液对瓦斯扩散量、扩散速率、扩散系数及抑制率的影响规律。结果表明：随着溶液质量分数增大，活性液与煤的接触角呈现“V”形变化，SDBS溶液对煤的润湿效果整体优于SDS溶液；对于单一活性液，质量分数3%的SDBS与SDS瓦斯抑制效果最佳，扩散系数分别为2.059×10-6 cm2/s和2.465×10-6 cm2/s,较干燥煤分别降低62.9%和55.6%,但质量分数5%SDS溶液因疏水反转效应导致瓦斯抑制效果劣化；在复配体系中，SDBS与SDS体积比1∶1时对瓦斯的协同抑制效应显著，润湿煤扩散系数仅为2.241×10-6 cm2/s,抑制率较单一SDS溶液提升10百分点以上；当SDBS与SDS体积比偏离1∶1时，胶束稳定性下降，瓦斯抑制效果减弱。
Abstract：Injecting active solutions into coal seams not only enhances the wettability of coal but also influences gas emission characteristics. To investigate the inhibition effects of dodecyl surfactants on gas diffusion in tectonic coal, we conducted experiments using tectonic coal treated with Sodium Dodecyl Benzene Sulfonate(SDBS) and Sodium Dodecyl Sulfate(SDS) solutions, both individually and in combination, at varying mass fractions. The effects of these active solutions on gas diffusion volume, diffusion velocity, diffusion coefficient, and inhibition ratio were systematically analyzed. This study aims to elucidate the synergistic inhibition mechanism of the SDBS-SDS blended system on gas diffusion and quantitatively assess its suppression effectiveness. The results indicate that as the mass fraction of the solution increases, the contact angle between the active solution and coal exhibits a “V”-shaped trend. Overall, SDBS solutions demonstrate superior wetting performance on coal compared to SDS solutions. For individual surfactant solutions, optimal inhibition of gas diffusion is observed at a mass fraction of 3% for both SDBS and SDS. At this concentration, the measured gas diffusion coefficients are 2.059×10-6 cm2/s and 2.465×10-6 cm2/s, respectively, corresponding to reductions of 62.9% and 55.6% relative to dry coal. However, when the mass fraction of SDS is increased to 5%, the gas inhibition performance deteriorates, which can be attributed to hydrophobic reversal effects that compromise wetting efficiency. In blended surfactant systems, a notable synergistic inhibition effect on gas diffusion is achieved when SDBS and SDS are combined at a volume ratio of 1:1. This optimal blend results in a diffusion coefficient of only 2.241×10-6 cm2/s for wetted coal, with an inhibition rate exceeding that of the SDS solution alone by more than 10 percentage points. Conversely, deviations from the 1:1 volume ratio lead to decreased micelle stability in the solution, weakening gas diffusion efficiency. This study provides a formulation optimization strategy for gas control in coal seams through liquid injection.
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基本信息:
DOI：10.13637/j.issn.1009-6094.2025.1654
中图分类号:TD712
引用信息:
[1]马宏宇,王龙,万文,等.十二烷基活性剂对构造煤瓦斯扩散的抑制效应[J].安全与环境学报,2026,26(06):2105-2115.DOI:10.13637/j.issn.1009-6094.2025.1654.
基金信息:
国家自然科学基金项目(52104224,52274194); 湖南省自然科学基金项目(2023JJ40632)
2026-03-24
2026-03-24
2026-03-24