炭化温度对炭化物微观结构影响的研究

采用扫描电子显微镜、全自动比表面积及孔径分析仪观察与研究了杉木间伐材在不同炭化温度下炭化物的微观结构、孔径分布、比表面积等,揭示了不同炭化温度下孔隙的形成特点与演变规律。实验表明,炭化温度对炭化物的比表面积与比孔容积特性影响很大,较高温度的炭化物具有较发达的孔隙结构与较高的比表面积。电镜观察可知,随着炭化温度升高,炭化物管胞表面沉积物量减少且颗粒变小,纹孔各层膜逐渐被破坏,纹孔开孔率增大,同时根据电镜观察中试样的放电状况可判断出炭化物导电性情况,随炭化温度升高,炭化物的导电性增大。

Effect of Carbonization Temperature on Microporous Structure of Charcoal from Chinese Fir Wood

By means of scanning electronic microscopy(SEM),automated specific surface-area and pore-size analysis,microporous structure of charcoal from Chinese fir wood carbonized under different temperatures was studied.With emphasis on formation of(micropore) and variation pattern,pore-size distribution,specific surface area and characteristics of pores were observed and analyzed.Results showed that both specific surface(area) and specific pore volume of charcoal increased with(increased) carbonization temperature.Carbonized material from higher temperature possessed more developed structure and larger specific surface area.Under high temperature,microporous structure was improved by burning off orderless carbon.By means of SEM,observation on state of microstructure of carbonized material showed that with increased carbonization temperature,amount of surface sediment on tracheid wall of carbonized material reduced and its particlesize became smaller,the layers of pits were gradually destroyed,and pit pores were opened.Observation on state of electric discharge under SEM showed that conductivity of carbonized material was(increased) with increase of carbonization temperature.