85m^3液氢铁路槽车的检漏和抽空  

Leak detection and evacuation for 85m^3 railway vessel car of liquid hydrogen

作　　者：王红雨[1] 黄宏[2] 陈光奇[2] 王晓娟[3] 

机构地区：[1]北京航天发射技术研究所,北京100076 [2]兰州物理研究所,兰州730000 [3]中国北车集团西安车辆厂,西安710086

出　　处：《低温工程》2007年第6期38-42,50,共6页Cryogenics

摘　　要：介绍了85 m3液氢铁路槽车首次定期检修过程中检漏与抽真空的设备配置、系统组成和实施工艺,对槽车夹层气体进行了质谱分析,对检漏工艺和抽空工艺的实施经验进行了分析。结果表明:氢气、水气和氮气是夹层的主要气体成分,首先进行检漏可为后面抽空提供前提条件,热氮冲洗置换和间断抽空排气的抽空工艺可以大大缩短抽空时间,得出了抽空时间与漏放气速率变化的规律。The system equipment,setup and implementation techniques for leak detection and evacuation in the first overhaul process of 85 m^3 railway vessel car of liquid hydrogen were discussed. The gas components in the interlayer of the car were analyzed by mass spectrograph. How to apply leak detection and evacuation methods was analyzed in detail. The results showed that H2, H2O and N2 were the major gas components in the interlayer of the car, leak detection could help the subsequent evacuation process. The methods of hot nitrogen replacement, discontinuous evacuation and adsorption could shorten the time of evacuation. In addition, the variation of the leak and outgassing rate through the evacuation process was obtained.

关 键 词：检漏 抽空 气体成分 总体漏率 漏放气速率 真空度 

分 类 号：TB658[一般工业技术—制冷工程]