摘要
采用一步炭化法与二步炭化法,加盖炭化法与未(不)加盖炭化法对杉木间伐材木 屑在不同炭化条件下进行热解研究,同时结合元素分析方法,探讨了杉木间伐材木屑炭化的固 体产物得率及其基本性质的变化规律。研究结果表明:炭化温度在400-600℃之间,炭化物 得率下降十分明显,此后相对趋于恒定;加盖炭化法的得率高于未加盖法;升温速率对炭化物得率有较大影 响。无论是一步炭化法还是二步法,炭化氛围气为空气时的炭化物固定碳含量及炭化物的还原性较氮气高。 无论氛围气体是空气还是氮气,炭化物的还原性均随着炭化温度升高而升高。
By techniques of one-step and two-step carbonization, capped and uncapped carbonization, with carbon dioxide, nitrogen, oxygen, air and their mixture as atmosphere gas, respectively, pyrolysis experiments on the thinning wood of Chinese fir, one of the fastest growing tree species in Southern China, are carried out. With special focuses on basic pyrolysis process of its sawdust and the affecting patterns on carbonized materials under different carbonization conditions, comprehensive analyses on yield of carbonized material and variation patterns are conducted. Furthermore, in combination with dement analysis, variation patterns of carbon, hydrogen, oxygen contents are also analyzed. The results reveal that the yield of the charcoal falls distinctly between 400 -600℃, hereafter, the yield gets to constant. The charcoal yield of capped carbonization method is higher than that of the uncapped. Fixed carbon content of the charcoal in air atmosphere is higher than that in N2 atmosphere, no matter whether the carbonized method is one-step or two-step. The reduction degree of charcoal in air atmosphere is higher than that in N2 atmosphere. Moreover, the reductivity is increased with the rise of carbonization temperature.
出处
《林产化学与工业》
EI
CAS
CSCD
2005年第B10期95-98,共4页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(30371140)福建省教育厅科技计划项目(JA05230)
关键词
木质炭化物
杉木间伐材
炭化机理
wood charcoals
thinning wood of Chinese fir
carbonization mechanism
