炭化温度对小麦秸秆炭化产率及理化特性的影响  

Effects of Carbonization Temperature on Biochar Yield and Physicochemical Properties from Wheat-straw

作　　者：张晓帆[1] 于晓娜[1] 周涵君 李志鹏[1] 付仲毅 孟琦[1] 叶协锋[1] 

机构地区：[1]河南农业大学烟草学院国家烟草栽培生理生化研究基地烟草行业烟草栽培重点实验室,河南郑州450002

出　　处：《华北农学报》2017年第4期201-207,共7页Acta Agriculturae Boreali-Sinica

基　　金：烟草行业烟草栽培重点实验室资助项目;河南省烟草公司资助项目(HYKJ201301);重庆市烟草公司资助项目(NY20140401070010)

摘　　要：研究了炭化温度对小麦秸秆生物炭产率及理化特性的影响,为小麦秸秆生物炭的制备及还田作用机制提供理论依据。通过低氧炭化法,以20℃/min的升温速度将小麦秸秆炭化至特定温度(100,200,300,400,500,600,700,800℃),然后对其炭化产率和理化性质(孔隙状况、全碳及无机碳含量、CEC含量、表面含氧官能团情况及p H值、FTIR)进行分析,结果表明,低温炭化时小麦秸秆生物炭呈酸性,400℃之后呈碱性;随热解温度的升高,小麦秸秆生物炭的炭化程度逐渐增大,100~400℃产率自91.32%降至18.52%;炭化过程中,小麦秸秆生物炭孔隙增加,结构疏松;比表面积、孔径和比孔容均表现出先增大后减小的趋势,且均在400℃时达到最大,分别为6.675 m2/g、13.992 nm、0.015 cm3/g;有机碳含量在200~400℃较高;CEC含量于400~800℃维持在较高水平,处于69.13~84.35 cmol/kg;FTIR和表面含氧官能团的结果显示,小麦秸秆生物炭的芳香化程度随着热解温度的升高而增大,结构也愈加稳定。小麦秸秆的制备以400℃左右的炭化温度条件较为理想。The paper studied the effects of carbonization temperature on biochar yield and the physicochemical properties from wheat-straw improved the application of wheat-straw biochar,in order to further expound the mechanism of action of wheat straw biochar. The effects of different carbonization temperatures（ 100,200,300,400,500,600,700,800 ℃） on wheat-straw biochar yield and the physicochemical properties（ porosity condition,the content of total carbon and inorganic carbon,CEC content,oxygen-containing functional group,p H and FTIR） were studied through mionectic carbonization with the heating rate of 20 ℃/min. Fourier transform infrared spectrometer was used to obtain infrared spectra and the reasons for the changes of biochar physicochemical properties were analyzed.The wheat-straw of low temperature carbonization was acidic,after 400 ℃,was alkaline. The degree of wheat straw biochar carbonized increased with the increased of carbonization temperature,and the yield decreased from 91. 32%to 18. 52% in 100-400 ℃. In the carbonization process,the wheat-straw biochar porosity increased,the structure was loose. Pore size,specific surface area and specific pore volume showed first increased and then decreased trend,and all reached the maximum at 400 ℃,were 6. 675 m2/g,13. 992 nm,0. 015 cm3/g respectively. In 200-400 ℃,the content of organic carbon was high. The content of CEC was maintained at a high level in 400-800 ℃,between69. 13-84. 35 cmol/kg. The analysis of infrared spectrum and surface oxygen functional groups showed that,with the increase of pyrolysis temperature,the degree of aromatization of wheat-straw biochar increased,and the structure became more stable. The carbonization temperature of wheat-straw is more ideal at about 400 ℃.

关 键 词：小麦秸秆 热解温度 生物炭 产率 理化特性 

分 类 号：S210[农业科学—农业机械化工程] X610[农业科学—农业工程]