基于工业分析的煤样粒径对瓦斯含量测定影响

Influence of Coal Particle Size on Gas Content Determination Based on Industrial Analysis

为研究基于工业分析的煤样粒径对瓦斯含量测定影响,采取艾维尔沟煤矿的煤,筛分制成0.2 mm以下粒径的6种不同粒径范围的煤样,进行工业分析,测得不同粒径煤样的水分、灰分和挥发分数据。分析结果表明,随着煤样粒径的减小,水分和挥发分占比减小,灰分占比增大。分析其原因,随煤样粒径的减小,其比表面积增大了,煤样中水分的蒸发和挥发分的挥发程度加剧。提出一个合适的粒径取值范围,在0.12~0.2 mm粒径范围取样可获得较为准确数据。依据间接法测定煤的瓦斯含量,取不同粒径煤样的水分和挥发分数据对艾维尔沟煤矿的煤进行瓦斯含量计算,得出2#煤样瓦斯含量最高,9#煤样瓦斯含量最低。按照查明煤炭资源量12482万t进行计算,2#煤样和9#煤样的瓦斯含量相差5.94%,总瓦斯含量相差36.17万m3,表明煤样粒径对间接测定瓦斯含量影响较大。

To study the effect of particle size of coal samples on gas content determination based on industrial analysis,the coal of Aiweiergou Coal Mine was screened and made into six coal samples with different particle sizes below 0.2 mm.The industrial analysis was carried out to measure the moisture,ash and volatile data of coal samples with different particle sizes.The analysis results showed that with the decrease in coal particle size,the proportion of moisture and volatile decreased,and the proportion of ash increased.The reason was that with the decrease of coal particle size,the specific surface area increased,and the evaporation of water and the volatilization of volatile matter in coal samples increased.A suitable particle size range was deduced,and more accurate data could be obtained by sampling in the particle size range of 0.12~0.2 mm.According to the indirect method to determine the gas content of coal,the moisture and volatile data of coal samples with different particle sizes were used to calculate the gas content of coal in the Aiweiergou Coal Mine.It was concluded that the gas content of the 2#coal sample was the highest and that of the 9#coal sample was the lowest.According to the identified coal resources of 124.82 Mt,the gas content difference between the 2#coal sample and 9#coal sample was 5.94%,and the total gas content difference was 361700 m3,indicating that the particle size of the coal sample had a great influence on the indirect determination of gas content.