聚四氟乙烯悬浮树脂流化床干燥中影响因素

Discussion on the influencing factors of the fluidize-bed drying system of PTFE suspension resin

为更清晰地了解聚四氟乙烯(PTFE)悬浮树脂在流化床干燥中的具体情况,分别以干燥区域、气体流量、温度以及干燥时间等作为探讨条件,分析其对PTFE悬浮树脂干燥过程的影响。结果表明,干燥前期,流化床层中不同区域树脂的含水量、粒径符合客观规律。相较于30 m^(3)/h的气体体积流量,50 m^(3)/h下具有更好的干燥效果;干燥时间分别为1、12 h时,所得树脂的含水量区别不大,但干燥时间的延长会大大降低干燥的效率;60℃的干燥温度明显缩短了干燥时间,但树脂的平均粒径变大等。

To better understand the specific case of the PTFE suspended resin in drying fluidized bed,this paper choose the area of drying fluidized bed,gas flow,temperature,and drying Time,etc.as the major factors.The results show that in the early stage of drying,the water content and particle size of the resin in different areas of the fluidized bed are consistent with the objective law.Air flow rate of 50 m3/h shows better drying results compared with the air flow rate of 30 m3/h.Drying time of 1h and 12 h,we get nearly moisture content of resin.The extension of drying time will greatly reduce the drying efficiency.The drying temperature of 60℃obviously shorten the drying time,but enlarge the average particle size of PTFE.