高级检索
姜延航,周露函,韩明旭,等. 一面四巷瓦斯抽采对采空区遗煤自燃影响数值模拟研究[J]. 煤炭科学技术,2024,52(S1):1−8. doi: 10.12438/cst.2023-2980
引用本文: 姜延航,周露函,韩明旭,等. 一面四巷瓦斯抽采对采空区遗煤自燃影响数值模拟研究[J]. 煤炭科学技术,2024,52(S1):1−8. doi: 10.12438/cst.2023-2980
JIANG Yanhang,ZHOU Luhan,HAN Mingxu,et al. Numerical simulation study on the effect of gas extraction in one face and four lanes on the spontaneous combustion of coal remains in the mining area[J]. Coal Science and Technology,2024,52(S1):1−8. doi: 10.12438/cst.2023-2980
Citation: JIANG Yanhang,ZHOU Luhan,HAN Mingxu,et al. Numerical simulation study on the effect of gas extraction in one face and four lanes on the spontaneous combustion of coal remains in the mining area[J]. Coal Science and Technology,2024,52(S1):1−8. doi: 10.12438/cst.2023-2980

一面四巷瓦斯抽采对采空区遗煤自燃影响数值模拟研究

Numerical simulation study on the effect of gas extraction in one face and four lanes on the spontaneous combustion of coal remains in the mining area

  • 摘要: 为研究高瓦斯易自燃煤层不同瓦斯治理条件下采空区自燃“三带”及温度场分布变化规律,结合某高瓦斯易自燃工作面的实际条件,构建了“一面四巷”采空区自然发火物理模型,将程序升温试验得到的煤样氧化耗氧参数和放热参数应用到数值模拟中,分别研究了不同供风量、低抽流量及高抽流量对采空区自燃“三带”及温度场分布的影响,定量分析了氧化带最大宽度、氧化带面积和采空区最高温度点等参数随供风量、低抽流量及高抽流量的变化规律。结果表明:在模拟测试范围内,提高供风量、低抽流量及高抽流量均会造成采空区漏风量增多,不利于采空区遗煤自燃防治;最高温度点变化不明显(仅在1 K范围内变化),高抽流量变化对采空区氧化带宽度和面积及最高温度的影响大于供风量和低抽流量;氧化带最大宽度随供风量增大而增加,采空区最高温度和氧化带面积随供风量增加而减小,供风量从1 600 m3/min增加到1 900 m3/min时,氧化带最大宽度增加了2 m(74 ~76 m),最高温度降低了0.1 K(315.38 ~315.28 K),氧化带面积减小了180.08 m2(8 669.49~8 489.41 m2);氧化带最大宽度随低抽流量增大而增加,采空区最高温度和氧化带面积均随抽采流量增大而增加,低抽流量从200 m3/min增加到300 m3/min时,氧化带最大宽度增加了2 m(75 ~77 m),最高温度升高了0.152 K(315.340~315.492 K),氧化带面积扩大了51.56 m2(8 553.79 ~8 605.35 m2)。高抽流量从80 m3/min增加到240 m3/min时,氧化带最大宽度保持在75 m,最高温度升高了0.76 K(315.13~315.89 K)。

     

    Abstract: In order to study the "three zones" of spontaneous combustion in gob under different gas treatment conditions of high gas prone to spontaneous combustion and the change law of temperature field distribution, combined with the actual conditions of a high gas prone to spontaneous combustion working surface, a physical model of spontaneous ignition in goaf with "one face and four lanes" was constructed. The oxidation oxygen consumption and heat release parameters of coal samples obtained from temperature programmed experiment were applied to numerical simulation. The influence of different air supply, low and high pumping flow on the "three zones" of spontaneous combustion and temperature field distribution in goaf was studied. The variation of parameters such as maximum width of oxidation zone, area of oxidation zone and maximum temperature point of goaf with air supply, low and high pumping flow was quantitatively analyzed. The results show that in the range of simulation test, increasing air supply, low pumping flow and high pumping flow will cause the increase of air leakage in goaf, which is not conducive to the prevention and control of spontaneous combustion of coal left in goaf. The maximum temperature point does not change significantly (only within the range of 1K), and the influence of the change of high pumping flow rate on the width and area of the oxidation zone and the maximum temperature of the goaf is greater than that of the air supply volume and low pumping flow rate. The maximum width of oxidation zone increases with the increase of air supply, and the maximum temperature of goaf and the area of oxidation zone decrease with the increase of air supply. When the air supply increases from 1600 m3/min to 1900 m3/min, the maximum width of oxidation zone increases by 2 m (74−76 m), and the maximum temperature decreases by 0.1 K (315.38−315.28 K). The oxidation zone area decreased by 180.08 m2 (8 669.49−8 489.41 m2). The maximum width of oxidation zone increases with the increase of low extraction flow rate, the maximum temperature of goaf and the area of oxidation zone increase with the increase of extraction flow rate. When the low extraction flow rate increases from 200 m3/min to 300 m3/min, the maximum width of oxidation zone increases by 2 m (75−77 m). The maximum temperature increased by 0.152 K (315.34−315.492 K), and the oxidation zone area expanded by 51.56 m2 (8 553.79−8 605.35 m2). When the high pumping rate increased from 80 m3/min to 240 m3/min, the maximum width of the oxidation zone remained at about 75 m, and the maximum temperature increased by 0.76 K (315.13−315.89 K).

     

/

返回文章
返回