论文部分内容阅读
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.
In this paper, the adsorption and desorption of industrial SO 2 with large granular activated carbon (SO 2) in flue gas has been studied.The adsorption simulation results of the solid particles diffusion model and the empirical models of LDF, LH and Vermeulen on single particles have been comparatively analyzed. The Vermeulen model and theory Value of the SO2 is higher than that of the other samples.At the same time, based on the Vermeulen model, the breakthrough curve of SO2 in large granular activated carbon bed is simulated and compared with the experimental data, the results show that the determination of the SO2 is greater than 0.99 The experimental results show that the desulfurization efficiency of the adsorbent decreases with the increase of the particle size, the concentration of SO_2 and the linear velocities are 1 000ppm and 0.3m · s -1 The breakthrough time of activated carbon bed was 6,4,1min and 34,02,15min respectively when Cout / Cin increased to 20% after penetrating. In addition, the maximum adsorption rate of bed was affected by Diffusion resistance decreases, and the axial adsorption rate gradually tends to be consistent.The results of this paper for industrial activated carbon adsorption of SO 2 to provide a scientific reference for the study.