THERMAL PROPERTIES OF PACKED COTTONY PAPER DURING DRY DISTILLATION PROCESS

像炭黑和活性碳这样的碳素材料在各种工业中都很有用。将纸张研磨到棉布上并进行碳化处理，发现其活性约为商业活性碳的75%。因此，可以认为大比表面积的废棉纸可以作为制备活性碳的原料。考虑到棉纸碳化设备的设计，包装棉纸在干馏过程中的热扩散率、导热系数、比热和密度等热性能是必需的。本文通过从外部连续均匀加热并测量圆筒外表面和中心位置的温度，实验获得了包装棉纸在半无限长圆柱形容器中的有效热扩散率kappalt；也就是说，在考虑了汽车…期间的热量产生和体积收缩之后通过改变假设的kappa_&lt；eq&gt；决定了更多的骨化。从而使干馏过程中样品半径的收缩比在300ﾟC附近基本不变，在300ﾟC以上迅速下降，450ﾟC以上接近一个恒定值。各升温速率下的表观密度在30 0~35 0ﾟC范围内也迅速下降，在5 0 0ﾟC以上范围内以极小值的方式增加，并逐渐趋于恒定值。棉纸的Eq和Gt；随着温度的升高而逐渐增大，直到约300ﾟC，然后由于放热和分解反应而突然增大。在400ﾟC左右出现最大值后，迅速下降，并逐渐接近某一值。较少

Carbonic materials like as the carbon black and the activated carbon are very useful for various industries. Grinding paper to the cottony and carbonizing it, authors found it shows about 75% activity of the commercial activated carbon. Therefore, it is considered the wasted cottony paper which has large surface area is available as the material of the activate carbon. Considering the design of the carbonization equipment of the cottony paper, thermal properties like as thermal diffusivity, thermal conductivity, specific heat and density of the packed cottony paper during the dry distilllation process is necessary.In this report, the effective thermal diffusivity kappa_<eq> Of packed cottony paper in the semifinite cylindrical vessel was experimentally obtained by heating continuously and uniformly from the outside and measuring the outer surface and center position temperatures of the cylinder. Namely, after considering the generation of heat and the shrinkage of the volume during car … More bonization, kappa_<eq> was decided by changing the assumed kappa_<eq> so as to match the measured center position temperature and the calculated temperature obtained as numerical solution of the one dimensional and unsteady differential-difference equation of heat conduction with the measured boundary conditions.As a result, the shrinkage ratio of the sample radius during the dry distilllation process did not change until near 300ﾟC,then decreased rapidly in the region above 300ﾟC and approached a constant value in the region above 450ﾟC.And, the apparent density for each temperature raising rate also decreases rapidly in the region between 300 and 350ﾟC and increases by way of minimum value and approaches a constant value gradually in the region more than 500ﾟC.Concerning to kappa_<eq> of cottony paper, it increases gradually with increment of temperature till about 300ﾟC and then suddenly increases owing to an exothermic and decomposite reaction. After showing the maximum value at about 400ﾟC,it decreases rapidly and approaches gradually to some value. Less