煤膨胀对CO_2吸附结果拟合的影响与修正方法  

Effects of coal swelling on modeling of CO_2 sorption on the coal and correction approaches

作　　者：周来[1,2] 冯启言[1,2] 陈中伟[3] 李向东[1,2] 刘波[1,2] 

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]中国矿业大学江苏省资源环境信息工程重点实验室,江苏徐州221008 [3]中国矿业大学理学院,江苏徐州221116

出　　处：《煤炭学报》2009年第5期673-677,共5页Journal of China Coal Society

基　　金：江苏省自然科学基金资助项目(BK2007034);江苏省研究生培养创新工程资助项目(2006);中国矿业大学青年科研基金资助项目(2006)

摘　　要：采用体积修正量表示吸附实验中的体积误差,对Langmuir和Dubinin-Astakhov拟合模型进行修正,并应用修正后的模型对25和40℃条件下CO2等温吸附实验结果进行重新拟合.比较模型修正前、后拟合结果发现,修正后的拟合曲线与实测数据更加吻合,25℃时修正模型拟合曲线与吸附结果的相关系数达到0.998,40℃时达到1.000.煤吸附膨胀使CO2实测吸附量较实际吸附量偏低,应用修正模型拟合出25和40℃的CO2准确吸附量相比测试结果分别增长1.8%-29.3%和1.1%-8.2%.D-A模型对CO2吸附数据的拟合效果均优于Langmuir模型.Volumetric errors that occurred in the isothermal sorption experiment were quantitatively modified in both Langmuir model and Dubinin - Astakhov model with a volumetric deviation. Furthermore, the experimental data of CO2 isothermal sorption under 25 and 40 ℃ conditions were refitted by the modified models. Modeling results indicate that the modified refitting results agree with experimental data much more satisfactorily than the fitting without model modification. The correlation coefficient of modified refitting curves with experimental data of 25 and 40 ℃ is up to 0. 998 and 1. 000 respectively. Comparing to the tested adsorption capacity of coal with volume errors of coal swelling, the corrected adsorption capacities of coal towards CO2, as predicted by the modified Langmuir and Dubinin- Astakhov models, increase by 1.8% to 29.3% and 1.1% to 8.2% respectively. Dubinin- Astakhov model generally works better than Langmuir model in the modeling of C02 sorption.

关 键 词：煤膨胀 二氧化碳 等温吸附 Langmuir拟合 Dubinin-Astakhov拟合 模型修正 

分 类 号：P618.11[天文地球—矿床学]