基于孔隙分形几何的生物质型煤固硫性能研究

Research on sulfur retention of bio-briquette based on pore fractal geometry

鉴于以往对生物质型煤的固硫性能的研究多限于经典的脱硫剂硫化反应 ,应用压汞测孔法测量多种典型配比和两种典型孔隙系统的生物质型煤的孔隙特性 .根据生物质型煤的孔径分布特征 ,建立孔隙分形结构模型 ,模拟相同分维的生物质型煤的孔隙率和比表面积 ;从孔隙分形结构的形核、生长的角度 ,探究生物质型煤的脱硫机理 ;进而得出生物质型煤分形结构存在的孔径范围 ,以及分维、均孔等分形几何参数与生物质质量分数的规律 .最后 ,提出并解释了“人工分形体”概念 ,用以描述类似生物质型煤孔体系的孔结构 .

The experimental method of mercury porosimetry was applied to determine the porous properties of typical mixed bio-briquettes in two typical pore systems to overcome the limitations of past researches on the characteristics of their sulfur retention which were compared to those of classical sulphuration reaction. A porous fractal structure model was established to simulate the porosity and specific surface area ratio of bio-briquettes in the same fractal dimension. The desulphurization mechanism of bio-briquettes from the viewpoint of core formation, and the development of the pore fractal structure, were investigated. And consequently, the porous diameter range of existing fractal structure was obtained, and the relationship between geometric parameters, such as fractal dimension and mean pore, and mass percent of bio-briquettes was investigated. As a result, the concept, 'Artificial Fractal Structure', was advanced and used to describe a type of porous system similar to that of bio-briquette.