College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan, China.
Center of Shanxi Mine Safety for Graduate Education Innovation, Taiyuan, China.
PLoS One. 2019 Sep 4;14(9):e0222003. doi: 10.1371/journal.pone.0222003. eCollection 2019.
In this study, a new type of N2-inhibitor-water mist (NIWM) technology was proposed to resolve the problem of fire prevention and extinguishing in the goaf of coal mine. The corresponding equipment was designed and manufactured. Under the condition that both gas pressure and liquid pressure were 0.5-2MPa, the NIWM equipment produced the water mist with Sauter mean diameter (SMD) range of 166-265μm. The experimental results of the operating parameters of NIWM equipment were in agreement with the theoretical derivation. The theory of two-phase flow atomisation can be used as theoretical guide for this technology. After that, on the basis of the NIWM equipment, the experiments of inhibiting low temperature (30-100°C) oxidation and extinguishing high temperature combustion of large dosage of coal sample were carried out. Water mist with SMD = 188μm had good diffusivity in the container. The inhibiting effect of N2-inhibitor-water mist on low temperature oxidation of coal was obviously greater than that of single material. N2-water mist extinguished the burning coal completely in 20 minutes. The addition of water mist solved the shortcoming of poor cooling effect of N2. In different stages of coal-oxygen reaction, N2, inhibitor and water mist play very different role in controlling the process of coal-oxygen reaction, which was not simple accumulation of the three. The combination of N2, inhibitor and water mist should be determined according to the state of the coal mine goaf fire. On the basis of the research conclusions, the onsite arrangement diagram of the NIWM fire prevention and extinguishing equipment in the goaf was designed. The research results proved the feasibility and effectiveness of this technology, and it is of great significance to the prevention and control of coal spontaneous combustion in goaf.
在这项研究中，提出了一种新型的 N2 抑制剂-水雾（NIWM）技术，以解决煤矿采空区的防火和灭火问题。设计并制造了相应的设备。在气压和液压力均为 0.5-2MPa 的条件下，NIWM 设备产生的水雾的索太尔平均直径（SMD）范围为 166-265μm。NIWM 设备运行参数的实验结果与理论推导一致。两相流雾化理论可为本技术提供理论指导。此后，在 NIWM 设备的基础上，进行了抑制低温（30-100°C）氧化和扑灭大剂量煤样高温燃烧的实验。SMD=188μm 的水雾在容器中有良好的扩散性。N2 抑制剂水雾对煤低温氧化的抑制效果明显大于单一物质。N2-水雾在 20 分钟内完全扑灭了燃烧的煤。水雾的加入解决了 N2 冷却效果差的缺点。在煤氧反应的不同阶段，N2、抑制剂和水雾在控制煤氧反应过程中发挥着非常不同的作用，而不是简单的三种物质的积累。N2、抑制剂和水雾的组合应根据采空区火灾的状态来确定。在研究结论的基础上，设计了采空区 NIWM 防火灭火设备的现场布置图。研究结果证明了该技术的可行性和有效性，对采空区煤自燃的防治具有重要意义。
