液氮再冷凝装置的设计与验证  

Design and Verification of ZBO Liquid Nitrogen Storage System

作　　者：朱建生[1,2] 焦天恕[2] 陆文海 刘立强 

机构地区：[1]航天低温推进剂技术国家重点实验室,北京100190 [2]酒泉卫星发射中心,甘肃酒泉735300

出　　处：《低温与特气》2016年第3期6-8,共3页Low Temperature and Specialty Gases

基　　金：航天低温推进剂技术国家重点实验室基金课题(SKLTSCP1310)

摘　　要：搭建了一个液氮零蒸发主动冷却的贮存测试系统,该系统的目标是针对一个日蒸发率为0.4%的10 m^3液氮贮槽实现液氮冷凝回收。首先,将贮槽中蒸发的冷氮气通到一个200 L的液氮杜瓦中,并通过该杜瓦顶部的GM制冷机,进行冷却和再液化,并对该杜瓦中的液氮液位进行测量,获得液化率。当200 L中的液氮杜瓦中的液氮完成液化后,通过切换阀门,并对杜瓦升压,将再液化的液氮泵入10 m^3的液氮贮槽中,恢复液氮贮槽中的液面,完成一次再冷凝。通过实验测试验证了该系统可以实现大于40 L/d的再液化率,能够满足该液氮贮槽的零蒸发要求。A Zero Boil-Off（ ZBO） liquid nitrogen storage system is built. The goal of this system is to recover the liquid nitrogen from a 10 m^3 liquid nitrogen storage tank with a daily evaporation rate of 0. 4%. First of all,the cold nitrogen gas will be piped to a 200 L of liquid nitrogen dewar and then to the GM refrigerator to be reliquefied. The dewar has a level senor which can be used to measure the level of liquid nitrogen. When the liquid nitrogen dewar is full,the liquid nitrogen will be pumped back to 10 m^3 liquid nitrogen tank. The experimental results show that the reliquefaction rate is more than40 L/d,which can meet the requirement of ZBO liquid nitrogen storage system.

关 键 词：零蒸发 再冷凝 GM制冷机 

分 类 号：TB657[一般工业技术—制冷工程]