弱还原性烟煤氧吸附及其动力学研究  

Study on oxygen adsorption and kinetic of weakly reductive bituminous coal

作　　者：吕俊鑫 赵洪宇[1] 梁新星[1,2] 李玉环[3] 宋强[1] 王新文[1] 舒新前[1] 

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]新疆北大青鸟哈密煤化工有限公司,新疆哈密839000 [3]内蒙古工业大学能源与动力工程学院,内蒙古呼和浩特010000

出　　处：《煤炭科学技术》2016年第8期193-198,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51074170);新疆维吾尔自治区科技攻关计划资助项目(201532108);国土资源部煤炭资源勘查与综合利用重点实验室开放研究课题资助项目(KF2015-3)

摘　　要：为掌握弱还原性烟煤在自然环境中的低温氧化规律,预防高温深井煤炭自燃,采用自制的固定床反应器对哈密煤样(HM)和灵武煤样(LW)进行不同载气流量的氧吸附试验,并对其动力学参数进行了拟合计算。研究结果表明,与载气中氧体积分数为25%相比,氧体积分数为15%时,LW和HM煤样氧吸附量明显增大,当温度达到160℃,2种煤样固定床出口氧体积分数分别为7.71%和6.41%。对于HM煤样,随着温度逐渐升高至100℃,煤样中氧吸附量逐渐增大,但此时载气中氧体积分数对煤样中氧含量变化影响较小。与原煤相比,脱灰煤样以及干燥温度较高的煤样比表面积较大,由于HM煤样比表面积大于LW煤样,吸附氧的活性位大于LW煤样,进而导致HM煤样在固定床出口处氧体积分数小于LW煤样。此外,当载气流量降低时,煤样中氧吸附量较大。HM和HM-D脱灰煤样在载气流量为40 m L/min时活化能最小,此时自燃倾向性最大;当载气流量为80 m L/min时,LW和LW-D脱灰煤样活化能最小,且LW-D煤样活化能大于LW煤样。In order to understand the rule of low temperature oxidation of weakly reductive coals in the natural environment and prevent the coal spontaneous combustion in deep mine on high temperature,oxygen adsorption experiment with different carrier gas velocity and the kinetic parameters were analyzed and calculated based on Hami and Lingwu weakly reductive bituminous coals（ Hami and Lingwu bituminous coal were denoted as HM and LW respectively） were carried out with a fixed bed reactor. The results show that compared with the volume fraction of oxygen in the carrier gas is 25%,when the volume fraction of oxygen is 15%,the oxygen consumption of LW and HM coal sample are obviously larger. when the temperature reaches 160 ℃,the volume fraction of outlet oxygen in fixed bed is 7. 71% and6. 41% respectively. For HM coal sample,as the temperature increased to 100 ℃,the adsorption content of oxygen in coal sample also gradually increase,but at the moment,the oxygen content in the carrier gas has little influence on the content of oxygen in coal sample. Compared with raw coal,demineralized coal samples and higher drying temperature of coal sample have larger specific surface area,and the specific surface area of HM coal sample is greater than the LW coal sample,and the activity of oxygen adsorption is greater than the LW coal sample,which leading to the volume fraction of oxygen in the outlet of fixed bed of HM coal sample is smaller than LW coal sample. In addition,when the carrier gas flow rate is decreased,the amount of oxygen adsorption in coal sample is larger. When the carrier gas flow rate is 40 m L / min,the activation energy of HM and demineralized HM-D coal sample is minimum,and the spontaneous combustion tendency is maximum at this time. When the carrier gas flow rate is 80 m L / min,the activation energy of LW and LW-D coal sample is minimum,and the activation energy of demineralized LW-D is greater than the LW.

关 键 词：烟煤 氧吸附量 煤自燃 矿物质脱除 活化能 

分 类 号：TQ530[化学工程—煤化学工程]