F - Mech Eng,Light,Heat,Weapons – 25 – J
Patent
F - Mech Eng,Light,Heat,Weapons
25
J
162/141
F25J 1/00 (2006.01) F25J 1/02 (2006.01)
Patent
CA 1262434
ABSTRACT OF THE DISCLOSURE There is disclosed a method of liquefying a permanent gas stream, comprising the steps of reducing the temperature of the permanent gas stream at elevated pressure to below its critical temperature, the reduction in temperature being effected at least in part by countercurrent heat exchange with work expanded working fluid at least some of such working fluid being at a temperature below the critical temperature of said permanent gas when it is brought into heat exchange relationship with the permanent gas stream; subjecting the permanent gas stream below said critical temperature to at least three successive isenthalpic expansions; separating resultant flash gas from the resultant liquid after each isenthalpic expansion, save the last, being the fluid that is expanded in the immediately succeeding isenthalpic expansion; and heat exchanging at least some of the said flash gas with said permanent gas stream. There is also disclosed apparatus for liquefying a permanent gas stream, comprising heat exchange means having a passage therethrough for the permanent gas stream at elevated pressure in heat exchange relationship with at least one passage for work expanded working fluid and at least one passage for flash gas, at least one work expansion means for providing at least some of the work-expanded working fluid at a temperature below the critical temperature of the permanent gas stream, whereby the temperature of the permanent gas stream is able to be cooled to below its critical temperature, at least three expansion valves in series for performing at least three successive isenthalpic expansions of said permanent gas stream, the downstream side of each valve communicating with a separator adapted to separate resultant flash gas from resultant liquefied gas and each separator save the most downstream having an outlet for liquefied gas that communicates with the upstream side of the next downstream one of the expansion valves.
487267
Marshall John
Oakey John D.
Gowling Lafleur Henderson Llp
Marshall John
Oakey John D.
The Boc Group Plc
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