玉米秸秆制备活性炭的吸附性能研究

Experiment on Adsorption Performance of Activated Carbon Prepared by Corn Straws

[目的]研究玉米秸秆制备活性炭的吸附性能。[方法]以玉米秸秆制备的粒状活性炭为研究对象,搭建了吸附性能模拟试验装置,采用静态重量法测试制备的活性炭对甲醇的吸附能力,并研究吸附床结构、吸附床内盛装粒径不同炭粒、活性炭中添加不同量的石墨粉以及改性活性炭等对系统吸附性能的影响。[结果]床内盛装同种试样炭料在同一吸附温度下,新型吸附床A(内置膜片式刺孔吸附质管)的吸附性能明显优于未进行结构改进的吸附床B,达到相同吸附量0.22 g/g时,A床吸附提前5 min;床内盛装不同粒径与同一粒径活性炭的对比试验,在同一吸附温度下,其吸附性能明显优于盛装同一粒径的,达到同一吸附量0.22 g/g时,吸附提前16 min;床内活性炭添加适量石墨粉可增强导热、强化吸附性能,最佳添加量为活性炭总量的20%;改性活性炭试验中,相比对照组经弱酸性溶液浸泡后活性炭可增强吸附性能,达到平衡吸附量87.1%时,吸附提前了3 min。[结论]该研究可为优化吸附床的结构设计和吸附式制冷系统提供参考。

[Objective] To study the adsorption performance of activated carbon prepared by corn straws. [Methods] Activated carbon prepared by corn straws was taken as research object,adsorption performance simulation test equipment was set up,and the static weight method was used to measure the activated carbon adsorption capacity of methanol. Also,adsorption bed structure,adsorption bed containing different particle size carbon particle,activated carbon supplemented with different amounts of graphite powder and modified activated carbon adsorption performance impact on the system were studied. [Results] For the bed material containing the same kinds of carbon adsorption samples at the same temperature,the new adsorption bed A adsorption performance was significantly better than for bed B whose structure is not transformed;when it reached the same absorption capacity 0. 22 g / g,bed A will absorb five minutes earlier; in the comparison test of different size and the same diameter of the activated carbon bed,for adsorption at the same temperature,the adsorption performance was significantly better than containing the same diameter,and achieved the same adsorption capacity 0. 22 g / g,the adsorption was implemented 16 minutes ahead of time; add proper amount of activated carbon graphite in the bed can enhance thermal conductivity and strengthen adsorption properties; the optimum dosage was 20% of total activated carbon; in the modified activated carbon test,after a weak acid solution soak charcoal,it can enhance the adsorption performance,compared to the control group,the absorption was completed 3 minutes ahead of time when reaching 87.1% of the balanced adsorption capacity. [Conclusion]This study is expected to provide reference for optimizing structural design of absorption bed and absorption type refrigeration system.