基于Vermeulen模型的活性炭脱硫研究

发布时间：2018-12-09 08:06

【摘要】：本文对工业用大颗粒活性炭吸附脱除烟气中SO_2开展了研究.对比分析了固相扩散理论模型与LDF、L-H、Vermeulen 3类经验模型在单颗粒上的吸附模拟结果,其中Vermeulen模型与理论值的吻合度较高.同时基于Vermeulen模型对SO_2在大颗粒活性炭床层中的穿透曲线进行了模拟,并与实验值进行对比,结果表明其准确度较高,判定系数R~2大于0.99.实验结果表明吸附剂的脱硫效率随颗粒粒径的增大而减小,SO_2进气浓度、线速度分别为1 000ppm、0.3m·s~(-1)时,3、5、10mm粒径活性炭床层穿透时间分别为6、4、1min,穿透后Cout/Cin升至20%时所经历的时间分别为34、22、15min;此外,床层最大吸附速率在吸附过程中受内扩散阻力影响而减小,且轴向各点吸附速率逐渐趋于一致.本文研究结果可为工业活性炭对SO_2的吸附脱除研究提供科学参考.
[Abstract]:In this paper, the adsorption and removal of SO_2 from flue gas by industrial granular activated carbon was studied. The adsorption simulation results of solid diffusion model and LDF,L-H,Vermeulen model on a single particle were compared with each other. The Vermeulen model was in good agreement with the theoretical value. At the same time, based on Vermeulen model, the penetration curve of SO_2 in the bed of large granular activated carbon was simulated, and compared with the experimental results, the results showed that the accuracy of the model was high, and the determination coefficient Rn2 was greater than 0.99. The experimental results show that the desulfurization efficiency of the adsorbent decreases with the increase of particle size. When the inlet concentration and linear velocity of SO_2 are 1 000 ppm 路s ~ (-1), respectively, the penetration time of the activated carbon bed with a diameter of 3 ~ 5 ~ 10 mm is 6 ~ 4 ~ (-1) min, respectively. The time of Cout/Cin rising to 20 after penetration was 34,2215min; In addition, the maximum adsorption rate of the bed decreases due to the influence of internal diffusion resistance during the adsorption process, and the adsorption rate of the axial points tends to be consistent. The results of this study can provide a scientific reference for the study of adsorption and removal of SO_2 from industrial activated carbon.
【作者单位】：北京科技大学机械工程学院;北京科技大学北京高校节能与环保工程研究中心;
【基金】：中央高校基本科研业务费专项资金资助(FRF-TP-15-024A3) 国家自然科学基金资助项目(51306017)
【分类号】：TQ424.1;X701.3

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