Experimental research on the fire-fighting effects of CO2 on the recrudescence process of oxidized coal
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摘要: 为掌握不同体积分数CO2对氧化煤复燃过程的抑制效果，采用自主研制的煤自燃氧化程序升温试验装置，对平煤八矿煤样分别通入体积分数为10 %、20 %、30 % 和40 % 的CO2进行试验研究，测定了煤初次和二次氧化升温过程中的耗氧速率、CO产生率以及表观活化能的变化规律。结果表明：与煤在纯空气条件下的氧化自燃相比，不同体积分数的CO2对煤氧化升温过程均具有抑制作用。同时，通入的CO2体积分数越大，煤初次和二次氧化升温过程的耗氧速率和CO产生率越低，表观活化能越高，即CO2的体积分数越大，对氧化煤复燃过程的抑制效果越好。Abstract: In order to master the fire-extinguishing efficiency of different concentrations of CO2 on the oxidized coal re-combustion, a self-developed coal spontaneous oxidation program temperature increasing experimental device was adopted to study the inhibitory effect of CO2 on coal oxidation and heating process, and the samples of Pingdingshan No.8 Coal Mine were fed with CO2 concentrations of 10 %, 20 %, 30 % and 40 % respectively.The oxygen consumption rate, the production rate of CO and the change law of apparent activation energy of coal were measured, and the result shows that different volume fractions of CO2 have inhibitory effects on the heating process of coal oxidation.The results show that different volume fractions of CO2 have an inhibitory effect compared with the oxidation under pure air conditions.At the same time, the larger the volume fraction of CO2 introduced, the lower the oxygen consumption and CO generation rate both the primary and secondary coal oxidation process, while the higher the apparent activation energy.That is to say, the larger the volume of CO2, the better the inhibition efficiency of the re-combustion process of oxidized coal.
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图 1 点扩散煤自燃氧化程序升温试验系统示意图
Figure 1. The experimental system schematic diagram of the programmed temperature oxidation based on the point diffusion
图 2 不同体积分数CO2防控煤自燃及其复燃过程耗氧速率变化曲线
Figure 2. Variation curve of oxygen consumption rate during prevention and control of coal spontaneous combustion with different volume fraction of CO2
图 3 不同体积分数CO2防控煤自燃及其复燃过程CO产生率变化曲线
Figure 3. Variation curve of CO generation rate during prevention and control of coal spontaneous combustion with different volume fraction of CO2
图 4 不同体积分数CO2熄灭煤自燃及其氧化煤复燃过程中表观活化能的对比
Figure 4. Comparison chart of apparent activation energy of coal spontaneous combustion and oxidized coal re-combustion with different concentrations of CO2
表 1 试验供气条件
Table 1. The experimental supply conditions
序号 CO2体积分数/% CO2流量/(mL·min-1) 空气流量/(mL·min-1) 总流量/(mL·min-1) 1 10 30 270 300 2 20 60 240 300 3 30 90 210 300 4 40 120 180 300 
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