液氮过滤器过滤特性研究

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1、上海交通大学硕士学位论文液氮过滤器过滤特性研究姓名：谢伟申请学位级别：硕士专业：制冷与低温工程指导教师：石玉美20070201上海交通大学硕士学位论文摘要度以后增大的趋势明显放慢。（2）过滤过程的理论分析建立低温过滤器过滤过程的压降计算模型。利用实验数据拟合出模型中3个重要参数，并应用模型对实际过滤过程的压降进行预测计算，其中包括对后续CGSE系统实际工况模拟实验的工况条件计算和CGSE系统实际中该过滤器的实际运行工况计算。同时还预测了在这些过滤工况下过滤器的理论失效时间。关键词：液氮、液氦、过滤

2、、压降计算、烧结金属过滤器V上海交通大学硕士学位论文摘要STUDYOFCHARACTERISTICSOFFILTERSUSEDTOFILTRATELIQUIDNITROGENABSTRACTCryogenicliquidfluidsarewidelyusedinsomehugescienceprojects,whichusuallyhaveveryspecialdemandsofthepurityofthosecryogenicliquidfluids.Thisstudyfocusesonhowt

3、oobtainhighlypurifiedcryogenicliquidfluids(thepercentageofpurity>99.999%)whichsatisfiesthedemandsofCGSEsystem.ThecharacteristicsofthecryogenicfilterusedinCGSEsystemarestudied.Thisstudyisbasedontheusageofengineeringproject.Itusestheoreticalanalysisande

4、xperimentalobservationtostudythecharacteristicsofthecryogenicfilter.Duringexperiment,theexperimentalplatformwhichisusedtosimulatetherealCGSEsystemisbuildandtheexperimentdataarerecordedbymanyrecordinginstruments.Byanalyzingtheexperimentdata,cometothese

5、conclusionsonsteadyprocessoffiltration:Ifilter’spressuredrop1)Thefilter’spressuredropincreasesasthepressureofcryogenicliquidfluidsgrows.2)Thefilter’spressuredropandtheflowrateofVI上海交通大学硕士学位论文摘要cryogenicliquidfluidsarelinear,whichmeanstheincreaseofflow

6、rateleadstotheincreaseofpressuredrop.3)Thefilter’spressuredropincreasesastheconcentrationofcryogenicliquidfluids’impuritygrows,butaftertheconcentrationofcryogenicliquidfluids’impuritycomestoacertainleveltheincreasetrendbecomeambiguous.IIfilter’scollec

7、tionefficiency1)Atthebeginning,thefilter’scollectionefficiencyincreasesgentlyastheflowrateofcryogenicliquidfluidsgrows.Afterthefilter’scollectionefficiencyachievesthemaximum,itbeginsdecreaseveryslowlyastheflowrateofcryogenicliquidfluidsincreases.2)Att

8、hebeginning,thefilter’scollectionefficiencyincreasesgentlyasthepressureofcryogenicliquidfluidsgrows.Afterthefilter’scollectionefficiencyachievesthemaximum,itbeginsdecreaseveryslowlyasthepressureofcryogenicliquidfluidsincreases.Theyformaparabol