US 2026/0235355 A1 · CARBON DIOXIDE SEPARATION PLANT USING EXTERNAL REFRIGERATION CIRCUIT, AND METHOD

Abstract

A plant comprising a heat exchanger adapted to receive a compressed inlet flue gas stream and condense CO2 contained in the compressed flue gas stream. The plant further comprises separation drums adapted to receive a chilled flue gas stream containing at least partly liquefied CO2 from the heat exchanger, and to separate liquid CO2 from the chilled flue gas stream. The pressurized CO2 collected at the liquid outlet of the separation drums flows through a pressurized CO2 outlet duct extending through the heat exchanger without expansion. The resulting liquefied or supercritical carbon dioxide at the outlet of the heat exchanger does not require to be compressed again. A refrigeration circuit removes heat from the inlet flue gas streaming through the heat exchanger.

Claims35

Dependent claims

A plant for producing liquid CO2 out of a flue gas, the plant comprising:

a heat exchanger adapted to receive a compressed inlet flue gas stream and condense at least part of the CO2 contained in the compressed flue gas stream;
a first separation drum adapted to receive a chilled flue gas stream containing at least partly liquefied CO2 from the heat exchanger, and to separate liquid CO2 from the chilled flue gas stream;
wherein the first separation drum comprises an inlet, a liquid outlet, and a gas outlet;
a pressurized CO2 outlet duct extending through the heat exchanger, wherethrough pressurized CO2 is removed from the plant;
wherein the liquid outlet of the first separation drum is fluidly coupled with the pressurized CO2 outlet duct;
and
a closed refrigeration circuit adapted to circulate a refrigerant through the heat exchanger and chill the compressed flue gas therewith.

4 more elements

A method for producing liquid CO2 out of a flue gas, the method comprising the following steps:

delivering a stream of compressed flue gas containing CO2 through a heat exchanger in heat exchange with a refrigerant circulating in a closed refrigeration circuit;
at least partially condensing CO2 contained in the compressed flue gas by heat exchange with said refrigerant;
separating a first stream of pressurized liquid CO2 from the stream of compressed flue gas in a first separation drum;
removing the first stream of pressurized liquid CO2 from the first separation drum;
and
flowing the first stream of pressurized CO2 through a CO2 outlet duct extending through the heat exchanger and removing the first stream of pressurized CO2 from the heat exchanger.

3 more elements

Dependencies are inferred from the claim text.

Carbon dioxide separation plant using external refrigeration circuit, and method

Life of this patent

Carbon dioxide separation plant using external refrigeration circuit, and method

Life of this patent

Abstract

Claims35