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US 2024/0102729 A1Published application
Lng process using feedstock as primary refrigerant
AssigneeJL Energy Transportation Inc.
InventorsIan Morris, John Legadin
Life of this patent
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Abstract
Described is a process for production of Liquefied Natural Gas (LNG) that optimises an offset turbo expansion chilling curve attributed to the refrigerant properties inherent to the natural gas feedstock for the majority of chilling, followed by a smaller externally sourced heat exchange to make the final phase transition to LNG. This process reduces the complexity and high capital costs associated with traditional LNG systems.
Claims15
A process for producing liquefied natural gas from a natural gas feedstock of a pipeline comprising:
- a) compressing and/or heating the natural gas feedstock upstream of an inlet of a turbo expander, to form a conditioned feedstock with a pressure and temperature that will enable chilling of the flow stream through J-T expansion along an offset chilling curve profile that terminates at the lower pressure levels of the gaseous region of its phase envelope;
- b) delivering the conditioned feedstock to the inlet of the turbo expansion device at the elevated temperature and elevated pressure;
- and
- c) expanding the conditioned feedstock in the turbo expansion device;
- and
- d) discharging an expanded gas, from an outlet of the turbo expansion device at a temperature of between about −175° F. and about −262° F. for pure methane or light NGL gas mixtures and between about −145° F. and about −175° F. for rich NGL mixes and at a pressure of between about 5 and about 15 psig,
- wherein the conditioned feedstock gas is not further compressed after delivery to the inlet of the turbo expansion device and before discharge from the outlet of the turbo expansion device.
4 more elements
Dependencies are inferred from the claim text.