基于流量校准的吸附测量方法及误差分析  

Adsorption measurement method based on flow calibration and its error analysis

作　　者：刘碧强 曹海山 LIU Biqiang;CAO Haishan(Department of Energy and Power Engineering,School of Mechanical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学机械工程学院能源与动力工程系,北京100084

出　　处：《化工学报》2022年第4期1597-1605,共9页CIESC Journal

基　　金：国家自然科学基金项目(U21A20494,52076115);北京市自然科学基金项目(3212019)。

摘　　要：多孔吸附材料广泛应用于分离提纯、气体储存和工业催化等领域,吸附等温线的测定对研究吸附性质具有重要意义。针对传统容积法易受管路温度均匀性影响的问题,介绍了一种基于流量校准的吸附测量方法。分析了两种方法的误差传递,并对比了结构参数、物性参数和仪表精度对测量结果的影响。分析结果显示,增大校准球体积和样品室容积可提升传统容积法测量精度,提升样品量、比过剩吸附量、密度和仪表精度,可提升两种方法的测量精度。相比传统容积法,基于流量校准的吸附测量方法误差因子数量更少,可实现更低的测量误差。研究成果对提升容积法吸附测量精度具有指导意义。Porous adsorbents are widely used in separation and purification,gas storage,and industrial catalysis,and the determination of adsorption isotherms is of great significance for studying adsorption properties.Aiming at solving the difficulty that the traditional volumetric method is easily affected by the temperature distribution along the pipeline,the paper introduces an adsorption measurement method based on flow calibration.The error transfer of both methods is analyzed,and the influence of the structure parameters,physical parameters and instrument accuracy on the adsorption measurement is compared.The results show that increasing the calibration ball volume and sample chamber volume can improve the adsorption measurement accuracy of the traditional volumetric method,and increasing the sample volume,excess adsorption amount,skeleton density and instrument accuracy can improve the measurement accuracy of both methods.Compared to the traditional volumetric method,the method based on flow calibration has fewer error factors and can achieve lower measurement errors.The results can help improve the measurement accuracy of the volumetric method.

关 键 词：吸附 测量 状态方程 误差分析 流量控制器 不确定度 

分 类 号：O647.32[理学—物理化学]