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US 2026/0177314 A1Published application
Energy efficient non-flammable refrigeration for co2-rich process streams
AssigneeUop LLC
InventorsJeffrey Tyska, John D. Wilkinson, Steven E. Zell, Anh Ngo, Lin Jin, Brian T. Lawrey, JR.
Life of this patent
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Abstract
Processes for chilling CO2 rich streams are described. The processes combine the use of a refrigerant mixture comprising CO2 and a first refrigerant capable of depressing the freezing point of CO2 to less than or equal to −60° C. and a series of flash drums which reduce the temperature and pressure of the refrigerant mixture and concentrate the first refrigerant.
Claims20
A process for chilling a CO2 rich stream, comprising:
- flashing a high-pressure liquid refrigerant stream from a mixed refrigerant receiver to partially vaporize and cool the high-pressure liquid refrigerant stream, the liquid refrigerant stream comprising a mixture of CO2 and a first refrigerant, wherein a concentration of the first refrigerant is sufficient to reduce a freezing point of the mixture to less than or equal to −60° C. in the lowest pressure section of the refrigerant process;
- separating the partially vaporized and cooled high-pressure liquid refrigerant stream into a first refrigerant liquid stream and a first refrigerant vapor stream in a first flash drum;
- cooling the CO2 rich stream with a first portion of the first refrigerant liquid stream from the first flash drum in a first cooler forming a first cooled CO2 rich stream and a first warmed refrigerant stream;
- flashing a second portion of the first refrigerant liquid stream from the first flash drum to partially vaporize and cool the second portion of the first refrigerant liquid stream from the first flash drum;
- separating the partially vaporized and cooled second portion of the first refrigerant liquid stream from the first flash drum into a second refrigerant liquid stream and a second refrigerant vapor stream in a second flash drum, the second flash drum having a lower temperature and a lower pressure than the first flash drum;
- further cooling the CO2 rich stream or cooling a second CO2 rich stream with a first portion of the second refrigerant liquid stream from the second flash drum in a second cooler forming a second cooled CO2 rich stream and a second warmed refrigerant stream;
- compressing the second refrigerant vapor stream from the second flash drum in a second compressor stage forming a second compressed refrigerant vapor stream;
- combining the first refrigerant vapor stream from the first flash drum and the second compressed refrigerant vapor stream from the second compressor stage to form a first combined refrigerant stream;
- compressing the first combined refrigerant stream in a first compressor stage to form a first combined compressed refrigerant stream;
- condensing the first combined compressed refrigerant stream with a cold stream to form a condensed high-pressure liquid refrigerant stream;
- and
- passing the condensed high-pressure liquid refrigerant stream to the mixed refrigerant receiver.
9 more elements
A process for chilling a CO2 rich stream, comprising:
- flashing a high-pressure liquid refrigerant stream from a mixed refrigerant receiver to partially vaporize and cool the high-pressure liquid refrigerant stream, the liquid refrigerant stream comprising a mixture of CO2 and a first refrigerant, wherein a concentration of the first refrigerant is sufficient to reduce a freezing point of the mixture to less than or equal to −60° C. in the lowest pressure section of the refrigerant process;
- separating the partially vaporized and cooled high-pressure liquid refrigerant stream into a first refrigerant liquid stream and a first refrigerant vapor stream in a first flash drum;
- cooling the CO2 rich stream with a first portion of the first refrigerant liquid stream from the first flash drum in a first cooler forming a first cooled CO2 rich stream and a first warmed refrigerant stream;
- flashing a second portion of the first refrigerant liquid stream from the first flash drum to partially vaporize and cool the second portion of the first refrigerant liquid stream from the first flash drum;
- separating the partially vaporized and cooled second portion of the first refrigerant liquid stream from the first flash drum into a second refrigerant liquid stream and a second refrigerant vapor stream in a second flash drum, the second flash drum having a lower temperature and a lower pressure than the first flash drum;
- further cooling the CO2 rich stream or cooling a second CO2 rich stream with a first portion of the second refrigerant liquid stream from the second flash drum in a second cooler forming a second cooled CO2 rich stream and a second warmed refrigerant stream;
- compressing the second refrigerant vapor stream from the second flash drum in a second compressor stage forming a second compressed refrigerant vapor stream;
- combining the first refrigerant vapor stream from the first flash drum and the second compressed refrigerant vapor stream from the second stage compressor to form a first combined refrigerant stream;
- compressing the first combined refrigerant stream to form a first combined compressed refrigerant stream;
- condensing the first combined compressed refrigerant stream with a secondary refrigerant stream comprising a second refrigerant from a secondary refrigerant loop to form a condensed high-pressure liquid refrigerant stream, wherein the secondary refrigerant loop comprises a screw compressor;
- and
- passing the condensed high-pressure liquid refrigerant stream to the mixed refrigerant receiver.
9 more elements
Dependencies are inferred from the claim text.