LI Shengzhi
,
YIN Yuande
,
XU Jie
,
HOU Junming
,
Jaehong YOON
钢铁研究学报(英文版)
Coldrolled thin strip steel of high flatness quality undergoes multistage deformation during tension leveling. Thus, the parameters of setup and manipulating are more difficult. With the aid of FE code MSCMARC, the tension leveling process of thin strip steel was numerically simulated. Concentrating on the influence of the roll intermeshes in 2# anticambering on the distribution and magnitude of residual stresses in leveled strip steel, several experiments were done with the tension leveler based on the results from the simulation. It was found from the simulation that the magnitude of longitudinal residual stresses in the crosssection of the leveled strip steel regularly presents obvious interdependence with the roll intermeshes in 2# anticambering. In addition, there is a steady zone as the longitudinal residual stresses of the surface layers in leveled strip steel vary with the roll intermeshes of 2# anticambering, which is of importance in the manipulation of tension levelers. It was also found that the distribution of strains and stresses across the width of strip steel is uneven during leveling or after removing the tension loaded upon the strip, from which it was found that 3D simulation could not be replaced by 2D analysis because 2D analysis in this case cannot represent the physical behavior of strip steel deformation during tension leveling.
关键词:
coldrolled strip steel;flatness;tension leveling;numerical simulation;shell element;residual stress
邵琰
,
鄢瑛
,
张会平
新型炭材料
以不锈钢微纤、粉状活性炭和粘合剂为原料,采用湿法造纸和烧结工艺制备出纸状微纤包覆活性炭复合材料；在固定床进出口端分别装填颗粒活性炭(13 cm)和微纤包覆活性炭复合材料(2 cm)形成结构化固定床,测定苯酚在颗粒活性炭固定床和结构化固定床上的吸附透过曲线；考察不同实验条件下苯酚在结构化固定床上的吸附动力学,并采用Yoon模型和无效层厚度理论进行理论分析。结果表明,相对于颗粒活性炭固定床,苯酚在结构化固定床上的吸附透过曲线斜率明显增加,苯酚在结构化固定床上的吸附透过曲线斜率随着进口初始浓度的提高或流体流量的增大而增大；根据无效层厚度理论和Yoon模型分别分析计算,苯酚在结构化固定床上的无效层厚度相对于颗粒活性炭固定床的减少了14%,Yoon模型中的吸附速率常数k值明显增加。因此,采用基于微纤包覆活性炭复合材料的结构化固定床,可以强化床层上的吸附传质过程,并提高吸附床层利用率。
关键词:
苯酚
,
活性炭
,
微纤包覆活性炭复合材料
,
吸附动力学
,
结构化固定床
刘剑
,
鄢瑛
,
张会平
材料导报
制备了微纤包覆活性炭复合材料,研究了甲苯在结构化固定床上的吸附动力学.通过在固定床的进口端和出口端分别装填颗粒活性炭(1.08 mm)和微纤复合材料形成结构化固定床,测定了甲苯在结构化固定床上的吸附透过曲线,并与颗粒活性炭固定床的实验结果进行比较,探讨了床层高度和气体流量对甲苯在结构化固定床上的吸附透过曲线的影响.结果表明,在相同的条件下,甲苯在结构化固定床层上的透过时间较在颗粒活性炭固定床上的透过时间延长了约20 min,床层利用率提高了12％.甲苯在结构化固定床上的吸附透过时间随着床层高度降低或气体流量增加而缩短.同时,采用Yoon-Nelson模型对甲苯在结构化固定床和颗粒活性炭固定床上的吸附透过曲线进行线性回归分析,实验结果与Yoon-Nelson模型能较好地吻合.
关键词:
吸附动力学
,
活性炭
,
微纤复合材料
,
结构化固定床
