摘要
为了考察咪唑类离子液体对煤自燃特性的影响,开展热重-差热同步热分析试验测试.结果表明:离子液体对煤自燃的失重过程有明显的减弱作用,且不同离子液体的作用效果不同.效果最好的为[BMIM][BF_4],抑制百分比约7.9%.同种阴离子([BF_4]^-)下,[BMIM]^+的抑制效果比[EMIM]^+强;同种阳离子([BMIM]^+)下,[BF_4]^-的抑制效果比[NO_3]^-和[I]^-强.差热结果显示:[BMIM][BF_4]处理煤样峰值温度提高28℃,放热量明显变低.通过采用热动力学分析方法,计算出煤样自燃过程中的表观活化能(E_a)和指前因子(A),得出煤样增重阶段的活化能均高于对应失重阶段的活化能,说明煤在失重阶段更容易氧化自燃,[BMIM][BF_4]处理煤的平均表观活化能高于其他煤样,说明其抑制效果较好.
To investigate the effect of imidazolium-based ionic liquids(ILs)on the oxidation characterisitcs of coal,an experimental analysis involving a synchronous thermal analyzer(TG-DSC)was performed.The results show that ILs have a significant weakening effect in the mass loss process of coal spontaneous combustion.The best effect is[BMIM][BF4]with an inhibiting percent of about 7.9%.For a given anion([BF4]-),the inhibitory effect of[BMIM]+is stronger than that of[EMIM]+.Moreover,for a given cation([BMIM]+),the inhibitory effect of[BF4]-is stronger than that of[NO3]-and[I]-.The results of differential thermal analysis show that the peak temperature of the[BMIM][BF4]treated coal sample increases by 28℃,and its heat release becomes significantly lower.To research the inhibiting effect of ILs on the oxidation reaction thermokinetics of coal,the apparent activation energy(Ea)and preexponential factor(A)were calculated.The results show that the Eavalues in the primary oxidation are higher than those in the combustion,and the coal treated with ILs has higher values of Eathan that of IL-untc,indicating that the spontaneous combustion of coal is more likely to occur in the weight loss stage,and[BMIM][BF4]has better inhibition effect.
作者
肖旸
吕慧菲
任帅京
邓军
王彩萍
XIAO Yang;LHuifei;REN Shuaijing;DENG Jun;WANG Caiping(Key Laboratory of Prevention and Control of Coal Fire,School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第1期175-181,共7页
Journal of China University of Mining & Technology
基金
国家青年科学基金项目(51504187)
陕西省博士后科研项目(2016BSHEDZZ28)
关键词
离子液体
煤
热重
动力学
表观活化能
ionic liquid
coal
thermogravimetry
thermokinetics
apparent activation energy
