Experimental Investigation of a Cryogenic Filter for Separating Solid Carbon Dioxide Particles from Liquid Nitrogen  

作　　者：李娟 石玉美 汪荣顺 李祥东 

机构地区：[1]Institute of Refrigeration and Cryogenics,Shanghai Jiaotong University,Shanghai 200240,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2009年第1期25-28,共4页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.50476022);the Ministries and Commissions of Science and Technology of Shanghai Government(No.03DZ 14014)

摘　　要：This paper presents an investigation of a new method of purifying cryogenic liquid using sintered metallic wire-mesh filter, which has the advantages of high purifying efficiency and preferred strength at absolutely low temperature. Experiments are conducted to purify solid CO2 particles from liquid nitrogen. Temperature and pressure in the upstream and downstream of the filter, and the flow rate of carbon dioxide （CO2） gas and liquid nitrogen are measured, with the gas content of filtrate analyzed using a CO2 concentration detector. It is illustrated that after filtration, the purity of liquid nitrogen （volume fraction） is higher than 99.99%, which means that the volume fraction of CO2 is less than 0.01%. Effects of operation parameters on the performance of the filter, such as pressure drop Ap and filtration efficiency E are analyzed quantitatively. The present conclusions will provide a guideline to the optimumal design and operation of sintered metallic wire-mesh filter in cryogenic application.This paper presents an investigation of a new method of purifying cryogenic liquid using sintered metallic wire-mesh filter,which has the advantages of high purifying efficiency and preferred strength at absolutely low temperature.Experiments are conducted to purify solid CO_2 particles from liquid nitrogen.Temperature and pressure in the upstream and downstream of the filter,and the flow rate of carbon dioxide(CO_2) gas and liquid nitrogen are measured,with the gas content of filtrate analyzed using a CO_2 concentration detector.It is illustrated that after filtration,the purity of liquid nitrogen(volume fraction) is higher than 99.99%,which means that the volume fraction of CO_2 is less than 0.01%.Effects of operation parameters on the performance of the filter,such as pressure drop△p and filtration efficiency E are analyzed quantitatively.The present conclusions will provide a guideline to the optimumal design and operation of sintered metallic wire-mesh filter in cryogenic application.

关 键 词：metallic wire-mesh filter cryogenic liquid pressure drop filtration efficiency 

分 类 号：TQ126.35[化学工程—无机化工] X16[环境科学与工程—环境科学]