炭化温度和时间对烟秆生物质炭微观结构和理化性质的影响

为揭示不同温度和时间炭化的生物质炭微观结构及理化性质差异,以烟秆为原料,研究炭化温度(300、450、600℃)和时间(1、3h)对烟秆生物质炭特性及元素组成的影响。结果表明,烟秆生物质炭呈多孔、高比表面积结构,较为完整地保留了烟秆的组织结构。烟秆生物质炭pH值、有机碳含量、全钾含量和C/N比随炭化温度的升高和时间的延长而升高,而产出率和全氮含量则呈降低趋势。炭化条件对烟秆生物质炭理化性质具有明显影响,炭化温度的影响大于炭化时间。生物质炭的农业应用为烟秆无害化处理提供了新途径,但受生产成本及烟秆就地炭化水平影响,烟秆生物质炭推广应用还有一定的局限性。

Effects of Pyrolytic Time and Temperature on Microstructure,Physical and Chemical Properties of Biochar Made from Tobacco Straws

Effects of temperature and duration of pyrolysis on the microstructure,physical and chemical properties of biochar made from tobacco straws were studied.Pyrolysis at 300,450,and 600 for 1 or 3 h to produce biochar were carried out for comparison.It was found that the resulting biochar was highly porous with a considerable specific surface area,and the structure remained largely that of the tobacco straws.As the pyrolytic time and temperature increased,the biochar increased on pH,organic carbon,total potassium and C/N ratio,while declined on output and total nitrogen.Conditions of the pyrolysis also significant affected the physical and chemical properties of the biochar,particularly,the temperature.Biochar for agriculture applications was a new venue to utilize tobacco straws.Nonetheless,the production cost,technology development,and on-site operation were some of the obstacles yet to be overcome before it could be feasibly applied for common practices.