Experimental study on CO generation law of coal left in goaf in shallow-buried comprehensive and mechanized coal mining face
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摘要: 为探究浅埋综采面采空区遗煤氧化过程中的CO产生规律，本文以高家梁矿浅埋煤层为研究对象，与阳泉矿深埋煤层相对比，利用油浴升温氧化系统对高家梁矿不同煤层的综采工作面煤样和阳泉矿煤样进行了升温氧化实验。研究表明：高家梁矿浅埋深各煤样在低温40 ℃时消耗O2产生CO体积分数达到1×10-4；各煤样在氧化升温过程中的耗氧速率、CO产生速率和放热强度随温度升高逐渐增加；高家梁矿浅埋深煤样产生了40 ℃和130 ℃两个临界温度，分别对应加速氧化反应起点和剧烈氧化反应起点，而阳泉矿深埋煤层煤样只有一个不明显临界温度，且相对滞后，达100 ℃~120 ℃；在相同煤温下，高家梁矿浅埋深各煤样CO产生量和产生速率、O2的消耗量和消耗速率均明显大于阳泉矿深埋煤层；高家梁矿浅埋深各煤层比阳泉矿煤层更早进入加速氧化阶段，且所需温度更低。可见，煤层埋藏越浅，升温氧化时煤的耗氧速率和CO产生速率越快，升温对浅埋深煤样的氧化放热促进作用更强。Abstract: In order to explore the law of CO generation in the oxidation process of coal leftover in shallow-buried comprehensive and mechanized mining areas, This article takes the shallow coal seam Gaojialiang Mine as the research object, and compares it with the deep coal seam Yangquan mine. Using the oil bath temperature-raising oxidation system, a temperature-increasing oxidation test was carried out on the coal samples of the fully mechanized coal mining face in different coal seams of Gaojialiang Mine and Yangquan Mine. Research shows: Each coal sample in the shallow-buried Gaojialiang Mine consumes O2 at a low temperature of 40 ℃ to produce CO volume fraction of 1×10-4; The oxygen consumption rate, CO production rate and heat release intensity of each coal sample during the oxidation and heating process gradually increase with the increase of temperature; The coal sample of the shallow-buried Gaojialiang Mine produced two critical temperatures of 40 ℃ and 130 ℃, corresponding to the starting point of accelerated oxidation reaction and the starting point of violent oxidation reaction, respectively. However, the Yangquan coal sample in the deep-buried coal seam has only one insignificant critical temperature, and relatively lagging behind, reaching 100 ℃~120 ℃. At the same coal temperature, the CO production and production rate of each coal seam in the shallow-buried Gaojialiang Mine, and the consumption and consumption rate of O2 in each coal seam are significantly greater than those of the deep-buried coal seam in Yangquan Mine. The coal seams of the shallow-buried Gaojialiang Mine enter the accelerated oxidation stage earlier than Yangquan coal seams, and the required temperature is lower. The shallower the coal seam is buried, the faster the coal's oxygen consumption rate and CO production rate during heating oxidation., The increase in temperature promotes the oxidation exotherm of coal samples at shallow depths more strongly.
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Key words:
- goaf /
- shallow buried /
- leftover coal oxidation /
- CO production law /
- oil bath heating oxidation /
- critical temperature
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图 1 油浴式煤升温氧化实验系统原理
1—质量流量计；2—混气室；3—升温炉；4—预热铜管；5—搅拌器；6—加热圈；7—硅油；8—煤样罐；9—测温线路；10—控制面板
Figure 1. Schematic diagram of oil bath coal low temperature oxidation experiment system
图 2 油浴式煤升温氧化实验装置
Figure 2. Oil bath coal low temperature oxidation experimental device
图 3 O2消耗量随温度变化的对比曲线
Figure 3. Comparison curve O2 consumption with temperature changing
图 4 CO生成量随温度变化的对比曲线
Figure 4. Comparison curve CO production with temperature changing
图 5 CO2生成量随温度变化的对比曲线
Figure 5. Comparison curve CO2 production with temperature changing
图 6 耗氧速率随温度变化的对比曲线
Figure 6. Comparison curve of oxygen consumption rate with temperature changing
图 7 CO产生速率随温度变化的对比曲线
Figure 7. Comparison curve of CO production rate with temperature changing
图 8 2-2中煤层的耗氧速率和CO产生速率线性回归分析
Figure 8. Linear regression analysis of oxygen consumption rate and CO production rate of 2-2中 coal seam
图 9 3-1煤层的耗氧速率和CO产生速率线性回归分析
Figure 9. Linear regression analysis of oxygen consumption rate and CO production rate of 3-1 coal seam
图 10 4-2中煤层的耗氧速率和CO产生速率线性回归分析
Figure 10. Linear regression analysis of oxygen consumption rate and CO production rate of 4-2中 coal seam
图 11 放热强度随温度变化的对比曲线
Figure 11. Change curve of heat release intensity with temperature changing
表 1 采集煤样信息
Table 1. Collected coal sample information
矿井名称 采样煤层 煤层埋深/m 高家梁矿 2-2中煤层 196 3-1煤层 229 4-2中煤层 278 阳泉矿 15煤层 ＜1 200 
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