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US 2023/0258400 A1Published application
Systems and Methods for Utilizing Boil-Off Gas for Supplemental Cooling in Natural Gas Liquefaction Plants
AssigneeBechtel Energy Technologies & Solutions, Inc.
InventorsMatt Taher, Cyrus B. Meher-Homji, Pradeep Pillai
Life of this patent
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Abstract
Systems and methods for using a multi-stage compressor to increase the temperature and pressure of BOG sent to a heat exchanger for cooling a separate liquid refrigerant. The subsequent stage(s) of the multi-stage compressor further compress the BOG, which is then recycled to a liquefaction unit or used as fuel gas for one or more turbines.
Claims13
A system for using a boil-off gas (BOG) to cool a separate refrigerant, comprising:
- a tank that contains the BOG;
- a multi-stage compressor in fluid communication with the BOG and positioned downstream from the tank;
- and
- a heat exchanger positioned between two stages of the multi-stage compressor and enclosing a portion of the separate refrigerant and a portion of the BOG for cooling the separate refrigerant, wherein the separate refrigerant is a glycol-water mixture, the BOG exiting an initial stage of the multi-stage compressor is compressed to a temperature of about −30° F. to 20° F. and the BOG exiting a last stage of the multi-stage compressor is connected to only one of a liquefaction unit and a turbine.
1 more element
(canceled)
A method for using a BOG to cool a separate refrigerant, comprising:
- directing the BOG from a tank to a multi-stage compressor;
- compressing the BOG in an initial stage of the multi-stage compressor to increase a temperature of the BOG representing a compressed BOG with a temperature of about −30° F. to 20° F.;
- and
- directing the compressed BOG to a heat exchanger wherein it is converted to a warmed BOG and cools the separate refrigerant, wherein the separate refrigerant is a glycol-water mixture having a freezing temperature that is below a temperature of the compressed BOG in the heat exchanger.
1 more element
(canceled)
Dependencies are inferred from the claim text.