·114 刘应书等：SARS患者专用微型制氧机工艺参数实验研究 Vol.26 No.1 Experimental Study on Operating Parameters of a Special Miniature PSA Oxygen Concentrator for SARS Patients LIU Yingshu,CUI Hongshe,YUE Kai,ZHANG Dexin,ZHAO Zhi Mechanical Engineering School,University of Science and Technology Beijing.Beijing 100083,China ABSTRACT To develop a special miniature PSA oxygen concentrator for SARS patients,the effects of operating parameters,such as production duration,purge-to-product ratio,product flowrate,length-to-diameter ratio of the columns and properties of adsorbents,on the product purity and recovery of the miniature PSA oxygen system were experimentally investigated.The experimental results show that,under miniaturization conditions for PSA process, the optimal production duration is 12s and the purge-to-product ratio is 0.5.The product purity decreases and the recovery increases when the product flowrate increase.When the product purity is above 90%,the product recovery is about 19%.The properties of adsorbent has significant influences on performances.The product purity increases with the length-to-diameter ratio of column increasing and the proper value of the ratio is between 3.7 and 4.0. KEY WORDS SARS;pressure swing adsorption;oxygen generation;product purity;product recovery (上接第58页) Effect of Strain-Induced Transformation on Grain Refinement of SAF2205 during Superplastic Deformation ZHANG Peixue,REN Xueping,XIE Jianxin,WANG Wei Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT A theoretic equation of deformation work,phase transformation temperature,initial grain size and metal structure was analyzed,and a method of controlling the precipitation of o phase was provided.On this basis, the properties and microstructures of SAF2205 duplex stainless steel during isothermal hot tensile tests were inves- tigated by means of stepped isothermal tension.The result shows that,with the method of fast cooling and tempera- ture-changed isothermal hot tension,the precipitation ofo phase can happen during the deformation,and the tiny and dispersed o phase can limit the growth of the grains.In order to realize the strain-induced precipitation ofo phase and the superplastic deformation of duplex stainless steel in lower temperatures,a faster cooling velocity needs to be applied. 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