航宇局在火箭研究中发展起来的低温冷却技术被转用于液化天然气的贮运,收到了很好的效果。大家知道,液化天然气是一种低温液体,它必须在摄氏零下127度的超低温情况下才能贮存和运输。因此这就为这种低温液体的贮运提出了许多难题。例如,在液化天然气从船上泵入到贮罐里之前,必须先把管道冷却,以免因超低温液体与较温暖管道之间的尖锐温差而引起的各种问题。冷却管道的方法是用一种小而稳定的低温物质的气流送入管道。气流的流速必须精确控 The low-temperature cooling technology developed by NASA during rocket research was diverted to storage and transportation of liquefied natural gas and received very good results. As we all know, liquefied natural gas is a cryogenic liquid which must be stored and transported at temperatures as low as 127 degrees Celsius. Therefore, this poses many problems for the storage and transportation of the cryogenic liquid. For example, pipes must be cooled before liquefied natural gas can be pumped into the tank from the ship to avoid problems caused by the sharp temperature difference between the cryogenic liquid and the warmer pipe. The way to cool the pipe is to use a small, steady stream of cold matter into the pipe. The flow velocity must be precisely controlled