Experimental study on the effect of CaCl2 solution on the inhibition effect of coal spontaneous combustion
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摘要:
将质量分数为20%的CaCl2溶液作为阻化剂，将原煤分别置于不同温度（30、50、70、90 ℃）的CaCl2溶液中浸泡不同时长，以制备不同预阻化程度的煤样，借助程序升温实验和红外光谱实验，研究CaCl2溶液对煤自燃的阻化效果。结果表明：随着预阻化温度的升高和预阻化时长的增加，煤表面活性基团（−CH3、−CH2和−COOH、−C＝O）的含量以及煤耗氧速率显著降低，预阻化率和交叉点温度明显提高；提高预阻化温度和增加预阻化时长均能够明显提高阻化剂对煤自燃特性的抑制率。
Abstract:In this paper, CaCl2 solution was used as an inhibitor. Raw coal was soaked in CaCl2 solution with a mass concentration of 20%, and inhibited coal samples were prepared at different temperature conditions (30 ℃, 50 ℃, 70 ℃ and 90 ℃) for different periods of time. The inhibition effect of CaCl2 solution on coal spontaneous combustion was studied through temperature programmed tests and infrared spectrum experiments. It was found that the content of surface active groups (−CH3, −CH2, −COOH, −C=O) and coal oxygen consumption rate decreased significantly with the increase of pre-inhibition temperature and pre-inhibition time. The inhibition rate and cross point temperature also increase significantly. The results show that increasing the pre-inhibition temperature and the pre-inhibition time can obviously improve the inhibitory effects on the spontaneous combustion characteristics of coal.
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图 1 原煤和预阻化煤样低温氧化作用下CO生成曲线
Figure 1. CO production curves of raw coal and the pre-inhibited coal under the action of low temperature oxidation
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图 2 不同预阻化程度煤样的CO生成曲线对比图
Figure 2. Comparison of the CO production of different coal samples pre-inhibited for different time at different temperature conditions
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图 3 经不同预阻化温度和预阻化时长处理煤样的预阻化率
Figure 3. The average inhibition rate of the coal samples pre-inhibited for different time at different temperature conditions
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图 4 不同预阻化程度煤样的交点温度
Figure 4. Intersection temperature of the pre-inhibited coal samples
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图 5 不同预阻化程度煤样的耗氧特性图
Figure 5. Oxygen consumption characteristics of the pre-inhibited coal samples
表 1 煤样的元素分析和工业分析
Table 1 Ultimate analysis and proximate analysis results of raw coal
% C元素
质量分数H元素
质量分数N元素
质量分数O元素
质量分数S元素
质量分数水分 灰分 挥发分 82.13 4.42 0.80 11.45 1.19 4.52 3.69 33.13 
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