水溶液酸碱度对煤自燃氧化特性的影响  

Effect of pH Values ofAqueous Solution on Characteristics of Coal Oxidation in Its Spontaneous Combustion

作　　者：宣京俭 袁树杰[1,2] 许晓雪 XUAN Jingjian;YUAN Shujie;XU Xiaoxue(School of Safety Science and Engineering,Anhui University of Science and Technology,Huainan Anhui,232001;Key Laboratory of Safe and Effective Coal Mining,Ministry of Education,Huainan Anhui,232001)

机构地区：[1]安徽理工大学安全科学与工程学院,安徽淮南232001 [2]煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

出　　处：《山西大同大学学报（自然科学版）》2024年第3期112-117,共6页Journal of Shanxi Datong University(Natural Science Edition)

摘　　要：为了研究水溶液酸碱度对煤氧化的影响,通过低温氮气吸附实验,研究了不同酸碱度水溶液处理后煤样的吸脱附等温线和孔隙结构参数的变化,计算了各煤样在吸附过程中高压阶段和低压阶段的分形维数。利用低温氧化实验,分析了煤低温氧化过程中的耗氧量以及CO生成量,计算出相应的煤氧化反应表观活化能。结果表明:处理煤样和原煤样吸脱附等温线线型相似,均为IUPAC分类中的Ⅱ型。水溶液处理后的煤样表面更加粗糙,比表面积更大,煤自燃倾向性更大。处理煤样的耗氧量、CO生成量和表观活化能也均高于原煤。在同一水分含量下,酸性溶液会促进煤自燃的发生,而碱性溶液会抑制煤自燃的发生,水溶液酸性越强对煤自燃的促进效果越好。In order to study the effect of pH of aqueous solution on coal oxidation,the changes of adsorption isotherm and pore structure parameters of coal samples treated with aqueous solution of different pH values were studied by low-temperature nitrogen ad‐sorption experiment.The fractal dimension of each coal sample was calculated separately for the high-pressure and low-pressure phas‐es of the adsorption process.By using low-temperature oxidation experiments,the oxygen consumption and CO production during low-temperature oxidation of coal were analyzed,and the corresponding apparent activation energies of the coal samples oxidation were calculated.The results show that the similar isotherm lines of treated coal samples and raw coal samples are type II in the IUPAC classification.The surface of coal samples treated with aqueous solutions is rougher,the specific surface area is larger,and the tenden‐cy of coal spontaneous combustion is larger.The oxygen consumption,CO production and apparent activation energy in oxidation of treated coal samples were also higher than those of raw coal.Under the same water content,the acidic aqueous solution promotes the occurrence of coal spontaneous combustion,while the alkaline aqueous solution inhibits the occurrence of coal spontaneous combus‐tion.The higher the acidity of the aqueous solution is,the more obvious the effect of promoting coal spontaneous combustion.

关 键 词：煤炭自燃 低温氧化 氧化特性 分形维数 

分 类 号：TD75[矿业工程—矿井通风与安全]