Gas liquefaction method and apparatus
First Claim
1. A method of liquifying a stream of permanent gas comprising nitrogen utilizing a single fluid cycle comprising:
- (a) compressing said gas stream to a pressure of from about 75 to 90 atmosphere;
(b) providing a nitrogen working fluid at a pressure of from about 75 to 90 atmospheres;
(c) cooling said fluid to a temperature of from about 170 to 200 K;
(d) work-expanding said fluid toa temperature of from about 107 to 120 K;
(e) warming the work-expanded fluid by heat exchange countercurrently to said gas stream thereby providing refrigeration necessary to reduce the temperature of said gas to below its critical temperature.
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Abstract
The present invention relates to the liquefaction of a permanent gas comprising nitrogen. The temperature of the permanent gas stream at a pressure in the range of 75 to 90 atmospheres is reduced to below its initial temperature. Providing at least part of the necessary refrigeration, a single nitrogen working fluid cycle is performed in which the nitrogen working fluid is compressed to a pressure in the range of 75 to 90 atmospheres, cooled to a temperature in the range of 170 to 200 K., work expanded to a temperature in the range of 107 to 120 K., and warmed by heat exchange countercurrently to the permanent gas stream, thereby providing refrigeration for the stream.
18 Citations
11 Claims
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1. A method of liquifying a stream of permanent gas comprising nitrogen utilizing a single fluid cycle comprising:
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(a) compressing said gas stream to a pressure of from about 75 to 90 atmosphere; (b) providing a nitrogen working fluid at a pressure of from about 75 to 90 atmospheres; (c) cooling said fluid to a temperature of from about 170 to 200 K; (d) work-expanding said fluid toa temperature of from about 107 to 120 K; (e) warming the work-expanded fluid by heat exchange countercurrently to said gas stream thereby providing refrigeration necessary to reduce the temperature of said gas to below its critical temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification