Process for liquefaction of a pressurized hydrocarbon-rich fraction
First Claim
1. A process for liquefaction of a pressurized gas stream containing hydrocarbons comprising:
- cooling and liquefying a pressurized hydrocarbon-rich gas stream by heat exchange with process streams to be heated,expanding the resultant liquefied stream by means of at least one expansion means into at least one storage tank, andremoving flash gas/boil-off gas stream from said at least one storage tank and compressing said flash gas/boil-off gas stream in at least one compression stage,wherein throughput of said flash gas/boil-off gas stream in said at least one compression stage is kept constant by controlling the position of said at least one expansion valve or expansion turbine by an FIC controller,whereby pressure immediately downstream of said at least one expansion means is maintained substantially constant.
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Abstract
A pressurized hydrocarbon-rich fraction is cooled and liquefied by heat exchange with the process flows to be heated. Thereafter, the fraction is expanded in an expansion valve and introduced into a storage tank. The flash gas/boil-off gas removed from the storage tank, which optionally forms one of the process flows to be heated, is compressed in one or more stages. The throughput of the flash gas/boil-off gas compressor is kept constant at full load via the position of the expansion valve or expansion turbine controlled by means of a FIC controller. The pressure following expansion valve or expansion turbine is kept substantially constant.
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Citations
21 Claims
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1. A process for liquefaction of a pressurized gas stream containing hydrocarbons comprising:
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cooling and liquefying a pressurized hydrocarbon-rich gas stream by heat exchange with process streams to be heated, expanding the resultant liquefied stream by means of at least one expansion means into at least one storage tank, and removing flash gas/boil-off gas stream from said at least one storage tank and compressing said flash gas/boil-off gas stream in at least one compression stage, wherein throughput of said flash gas/boil-off gas stream in said at least one compression stage is kept constant by controlling the position of said at least one expansion valve or expansion turbine by an FIC controller, whereby pressure immediately downstream of said at least one expansion means is maintained substantially constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification