MVR耙式干燥系统设计及蒸发性能研究  

Design and evaporation performance of rake dryer based on mechanical vapor recompression

作　　者：陈海[1] 程榕[1] 郑燕萍[1] 杨阿三[1] 孙勤[1] CHEN Hai CHENG Rong ZHENG Yan-ping YANG A-san SUN Qin(College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

机构地区：[1]浙江工业大学化学工程学院浙江省生物燃料利用技术研究重点实验室,浙江杭州310014

出　　处：《现代化工》2017年第8期174-177,共4页Modern Chemical Industry

摘　　要：设计的MVR耙式干燥系统采用罗茨蒸汽压缩机替换耙式干燥系统中的真空泵,将干燥过程脱出的二次蒸汽压缩以提高压力和温度后作为热源使用。节省了大量热能,节能效果显著。该系统干燥物料可以是粉粒状、膏状、浆状,也可以是溶液(此时包含蒸发、结晶和干燥过程)。为了探索MVR耙式干燥系统干燥溶液的规律,首先以水为对象进行了实验研究。结果表明,适当减小压缩比、控制过热度、降低干燥压力均有利于提高系统的运行效率。在实验范围内,MVR耙式干燥系统的能效比(COP)为4.4~8.8,单位能耗除湿量(SMER)为2.0~3.4 kg/k Wh。按照目前的蒸汽电价比及能源状况,该工艺在干燥中仍有很大的应用前景。In the designed mechanical vapor recompression（ MVR） rake drying system,a Roots steam compressor instead of the vacuum pump in a rake drying system,is used to compress the secondary steam that is removed from the drying process,in order to increase its pressure and temperature,making it become heat resource.This measure can save plenty of heat energy,bringing about significant energy efficiency.This drying system is suitable for materials in the forms of powder,paste,slurry and solution.In order to explore the rule that a solution is dried by the MVR rake drying system,water is at first used as research object in experiment. The results show that properly reducing compression ratio,controlling overheat and descending drying pressure are all selected to improve the operating efficiency of the system. In the range of experiments,the coefficient of performance（ COP） of MVR rake drying system is 3. 4-8. 3 and the specific moisture extraction rate（ SMER） is 1. 0-3. 4 kg·（ k W·h）^-1.Given the current price ration between steam and electricity as well as current energy situation,this technology still has a great prospect.

关 键 词：机械蒸汽再压缩技术 耙式干燥 节能 蒸发 能效比 单位能耗除湿量 

分 类 号：TQ051.892[化学工程]