Feng Tai, Kong Qiwen, Xue Jiangwei, Li Longzhi, Liu Peiyi, Li Shanchuan, Zhang Zhen
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, 266590, People's Republic of China.
College of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, 450045, People's Republic of China.
Environ Sci Pollut Res Int. 2022 Dec;29(59):89210-89220. doi: 10.1007/s11356-022-22031-x. Epub 2022 Jul 18.
The rapid and low-cost preparation of powder activated coke (PAC) is very important for the promotion of fluidized dry desulfurization technology of activated coke. In order to explore the effect of rapid pyrolysis process on SO adsorption capacity of PAC, the fractal analysis of PAC prepared under different atmospheres was carried out. The Frenkel-Halsey-Hill (FHH) method was used to determine two fractal dimensions D and D, under relative pressures of 0-0.5 and 0.5-1, respectively. The results indicate that the fractal dimensions were influenced by the concentrations of activation agents with D ranging from 2.1838 to 2.8643 and D ranging from 2.7485 to 2.9257. The effect of steam on the fractal dimension of PAC sample is small, but oxygen has a great promotion effect on the fractal dimension. An n-shaped curve-based relationship between fractal dimensions and coke yields is observed with a peak values of fractal dimensions appearing around 64% yield. The SO adsorption capacity shows a consecutively positive linear correlation with D, while it illustrates distinctly different linear rates with D in intervals of 2-2.6 and 2.6-3, respectively. Taking advantage of fractal analysis as research method, this paper clarified the influence of activation atmosphere and ablative degree on the SO adsorption capacity of PAC, and the research conclusion provided a basis for the PAC preparation with high SO capacity.
快速低成本制备粉末活性焦（PAC）对于推动活性焦流化干法脱硫技术具有重要意义。为探究快速热解过程对PAC吸附SO性能的影响，对不同气氛下制备的PAC进行了分形分析。采用Frenkel-Halsey-Hill（FHH）方法分别测定了相对压力为0 - 0.5和0.5 - 1时的两个分形维数D和D。结果表明，分形维数受活化剂浓度影响，D的范围为2.1838至2.8643，D的范围为2.7485至2.9257。蒸汽对PAC样品分形维数的影响较小，但氧气对分形维数有较大促进作用。观察到分形维数与焦炭产率之间呈n形曲线关系，分形维数峰值出现在产率约64%处。SO吸附容量与D呈连续正线性相关，而与D在2 - 2.6和2.6 - 3区间分别呈现明显不同的线性速率。本文利用分形分析作为研究方法，阐明了活化气氛和烧蚀程度对PAC吸附SO性能的影响，研究结论为制备高SO吸附容量的PAC提供了依据。
