Abstract: 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·(kW·h)-1.Given the current price ration between steam and electricity as well as current energy situation,this technology still has a great prospect.
陈海, 程榕, 郑燕萍, 杨阿三, 孙勤. MVR耙式干燥系统设计及蒸发性能研究[J]. 现代化工, 2017, 37(8): 174-177.
CHEN Hai, CHENG Rong, ZHENG Yan-ping, YANG A-san, SUN Qin. Design and evaporation performance of rake dryer based on mechanical vapor recompression. Modern Chemical Industry, 2017, 37(8): 174-177.
[1] Mujumdar A S,Wu Z H.Thermal drying technologies:New developments and future R&D potential[C].Hong Kong:Proceedings of the 5th Asia-Pacific Drying Conference,2007:1-8. [2] Mujumdar A S.Industrial drying:Innovation,situation and developing needs[J].Drying Technology & equipment,2007,4(2):60-69. [3] Tadeusz Kudra,Arun S Mujumdar.Advanced drying technologies[M].CRC Press[Imprint];Taylor & Francis Group;Taylor & Francis Group[Distributor],2010. [4] 李伟,朱曼利,洪厚胜.机械蒸汽再压缩技术(MVR)研究现状[J].现代化工,2016,36(11):28-31. [5] Martin Fehlau.Optimization of vapor compression for cost savings in drying processes[J].Chem Eng Technol,2000,23(10):901-908. [6] Peregrina Carlos,Rudolph Victor,Lecomte Didier,et al.Immersion frying for the thermal drying of sewage sludge:An economic assessment[J].Journal of Environmental Management,2008,86(1):246-261. [7] Liu Y,Aziz Muhammad,Kansha Y,et al.Application of the self-heat recuperation technology for energy saving in biomass drying system[J].Fuel Processing Technology,2014,117:66-74. [8] 戴群特,杨鲁伟,张振涛,等.蒸汽再压缩热泵系统用于固体干燥节能分析[J].节能技术,2011,29(4):353-356. [9] 陈彬.节能型盘式污泥干燥设备研发[D].杭州:杭州电子科技大学,2011. [10] 周雷,韩东.基于蒸汽再压缩技术的低温干燥系统设计与节能分析[J].节能技术,2014,32(1):60-64. [11] 张华博,张继军,刘燕,等.机械蒸汽再压缩技术在盘式干燥器中的应用[J].化学工程,2015,43(5):1-5. [12] 邵康乐.耙式干燥器的设计[J].江苏化工,1991,1(3):49-53. [13] 刘广文.干燥设备设计手册[M].北京:机械工业出版社,2009. [14] 徐成海,张世伟,关奎之.真空干燥[M].北京:化学工业出版社,2004. [15] 陈东,谢继红.热泵干燥装置[M].北京:化学工业出版社,2007. [16] 潘永康,王喜忠,刘相东.现代干燥技术[M].2版.北京:化学工业出版社,2006.
