| 摘要 |
Method and apparatus for removing condensable gaseous impurities from helium gas. The impure helium is cooled by indirect heat exchange with cold pure helium to condense out impurities. The fluid flow within the purifying heat exchanger is automatically controlled and cooling of the impure stream is periodic, being carried out during those periods when the heat exchanger registers a temperature within a predetermined range in its coldest section. Warm pure helium is used for periodic warmup to remove condensed impurities. The purification system is conveniently integrated into a cryostat such as that described in U.S. Pat. No. 2,458,894 or U.S. Pat. No. 3,250,079. |
