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32 / 2023-05-15 08:50:39
Green and efficient foam dust suppression technology and its application in coal mines
Dust control,Foam materials,Foam production,Source dust suppression
8. Mine occupational hazards
摘要录用
Hetang Wang / China University of Mining and Technology
Han Han / China University of Mining and Technology
Deming Wang / China University of Mining and Technology
Chaohang Xu / China University of Mining and Technology
Xiaolong Zhu / China University of Mining and Technology
    Effective source suppression of dust generation and dispersal is the top priority for dust prevention and control in mines. As the mechanization of mining and the intensity of mining increases, dust production increases, making it more challenging to mitigate dust in coal mines. Existing technologies such as water spraying, ventilation, and coal seam water injection are insufficient to meet the demands for high efficiency and low water consumption in dust control. There is an urgent need to develop new technologies with high dust reduction efficiency and low water usage. As a gas-liquid two-phase medium containing a foaming agent, foam possesses the unique benefits of an expansive dust interception zone, robust dust bonding capability, and rapid dust moistening, rendering it an effective means for dust suppression, particularly for respirable dust. Therefore, based on the basic theory of foam dust suppression, a combination of theoretical analysis, experimental research, numerical simulation and field testing has been used to develop a complete set of technologies for the efficient suppression of coal mine dust sources including environmentally friendly foam material preparation methods, low resistance and high efficiency foam production methods, foam ring spraying methods and dust suppression performance: An environmentally friendly foaming agent has been developed to improve the strength of the foam film, increasing the viscoelasticity of the foam film by synergizing a preferred green surfactant with water-soluble polymers. Resistance to hard water was improved by replacing the hydration of ionic bonds with hydrogen bonds. The foaming agent has 40-50% higher pressure bearing capacity than traditional foaming agents and is used in concentrations as low as 0.1%. A new method and device were innovated for jet vaporization aspiration liquid and low-resistance foam production using pressurized gas and water. The stable static pressure difference formed by water jet vaporization phase change is utilized to achieve a low foaming agent proportion (0.1%) and stable continuous automatic feeding while reducing internal resistance loss (outlet pressure > 0.25MPa). This realizes low-consumption and low-resistance preparation of dust suppression foam. The foam annular spraying device has been developed according to the structure of extractors, using an adjustable flexible annular bracket to mount several special foam nozzles on the extractor cantilever near the dust source. This ensures stable formation and directional action of the annular foam flow to the dust source in the cut-off section, avoiding the effect of pressurized airflow on the foam spraying flow pattern. The device can spray a 200mm thick foam ring with a range of at least 2.5m. Field application results show this foam source efficient dust suppression technology achieves over 90% respirable dust suppression efficiency, a 40% increase over water spraying, and an 80% reduction in water consumption. This technology has been applied in several major coal producing areas in China, overcome technical bottlenecks in efficient preparation, utilization and green application of foam, enabling effective prevention and control of dust in underground coal mines. What's more, it also safeguards miner occupational health and safety and mine production, and has become a key core technology for source dust prevention and control.

 
重要日期

  • 会议日期

    08月18日

    2023

    至

    08月20日

    2023

  • 07月07日 2023

    初稿截稿日期

  • 08月20日 2023

    注册截止日期

主办单位
International Committee of Mine Safety Science and Engineering
承办单位
Heilongjiang University of Science and Technology
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