| 摘要 |
1,001,938. Liquefaction of hydrogen. SULZER BROS. Ltd. Aug. 4, 1964 [Sept. 6, 1963], No. 31387/64. Heading F4P. An hydrogen liquefaction process comprises circulating hydrogen gas through a refrigeration circuit comprising a compressor 23 and at least two series connected expansion turbines 24 ... 27, withdrawing as a component flow a minor portion of hydrogen through a line 29 upstream of the last turbine 27, further cooling said flow in exchangers 13, 14, 16, 17 cooled by the remainder of the hydrogen having been expanded in turbines 27, 28, converting the component flow at least partly into the paraform by passage through catalysts 30 ... 33, condensing the partly converted component flow in the coil 35 of a liquefier 20 by heat exchange with " crude " hydrogen having been withdrawn from a holder 3 by a compressor 2, cooled in exchangers 8, 9, 11 to 14, 16, 17, purified in absorbers 6, 7, 10, 15, 18 and in part liquefied at 20 by expansion at a valve 19 into a pressure below that of the component flow in line 29; the product liquid para-hydrogen being withdrawn from the liquefier whilst the so vaporized " crude " hydrogen is fed through a line 34 into said major portion of refrigerant hydrogen at a suitable pressure point, e.g. the inlet of a turbine 28 to which turbine 27 exhausts. As shown, product liquid para -hydrogen is sub-cooled in an exchanger 37, traversed by " crude " hydrogen having been expanded at 39 and the liquid product is throttled at 42 into a separator 43 from which hydrogen gas is withdrawn through a line 45 to be joined by " crude " hydrogen gas in a line 40 and being returned through lines 41, 21 to the inlet of compressor 23. Any excess hydrogen in line 21 is drawn through a line 5 and a non-return valve 46 into the inlet of the " crude " hydrogen compressor 2. |
