适用于真空管道交通的高温超导磁悬浮车低温液氮容器

Liquid nitrogen container on high temperature superconducting maglev which fits to evacuated tube transportation

真空管道运输系统的建成以及在全球的普及与应用,将是继火车、汽车、飞机和IT之后人类的又一大福祉。将使今天面临的交通困境从根本上得以解决,也将给全球经济与社会生活方式带来全新的变化。磁悬浮车是真空管道交通系统的运行主体,在各种不同模式的磁悬浮车中,高温超导磁悬浮车非常适合于真空管道交通。然而,由于真空管道中是低压环境,用于常压环境的高温超导磁悬浮车低温液氮容器不适合直接用于真空管道交通系统。提出在真空管道交通中,采用带压力阀的高温超导磁悬浮车低温液氮容器。这是一种压力容器,器壁要承受压差,当前常用的矩形高温超导磁悬浮车低温液氮容器则不适合,进一步提出能承受较高压力的圆柱形低温液氮容器的设计构想。还对真空管道交通中真空环境对提高液氮容器保温效果的意义进行了讨论。

Evacuated Tube Transportation （ETT） will be constructed and used widely on the world in the not far future, and, it will be another evangel for human beings after train, automobile, airplane and information technology. ETT will be a radica/solution to nowaday austere transportation problem, and will bring to significant change to global economy and society life style. Maglev will be the principal running part of ETT. Among various Maglev modes, high temperature superconducting Maglev （HTSM） is one which fit to ETT system. However, because of the low pressure circumstance in ETT tube, the liquid nitrogen eorttainer used in HTSM running in an open ordinaiy circumstance, shouldnt be directly used in EFT system. This paper points out that a liquid nitrogen container should be installed with a pressure valve so that it fits to EFT system. Such container will be a pressure container, existing a pressure difference between two sides of the container wall, so that a rectangle container used in current HTSM will not right to be used as a pressure container. In this case, this paper suggests to use column liquid nitrogen container on HTSM in ETT which is able to endure high pressure. In addition, this paper discussed the significance that vacuum environment in ETT tube is helpful to improve the heat preservation effection of liquid notrogen container.