# US 11,905,882 B2 · Apparatus and method for liquid air energy storage with carbon dioxide capture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,905,882 B2 - Document ID: US11905882B2 - Status: Granted - Kind: B2 - Application number: 17/660,540 - Filed: 2022-04-25 - Published: 2023-10-26 - Granted: 2024-02-20 - Earliest claimed: 2022-04-25 - Assignees: Southwest Research Institute - Applicants: Southwest Research Institute - Inventors: Timothy C. Allison; Owen M. Pryor; William M. Conlon - Web page: https://patentgrep.com/patent/US11905882B2 ## CPC - F02C 7/22: Fuel supply systems - F01D 15/10: Adaptations for driving, or combinations with, electric generators - F02C 6/18: using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants (using waste heat as source of energy for refrigeration plants F25B27/02; using the waste heat of a gasturbine for steam generation or in a steam cycle see F01K23/10) - F02C 7/08: Heating air supply before combustion, e.g. by exhaust gases - F23R 3/28: characterised by the fuel supply (burners F23D) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16) ## Abstract Apparatus and methods for storing energy in liquid air and releasing the energy through a thermal power cycle, that incorporates liquid carbon dioxide capture and separation from the exhaust stream. ## Claims ### Claim 1 A liquid air energy release apparatus comprising: a. a liquid air storage apparatus containing liquid air and a cryogenic pump fluidly connected to said liquid air storage apparatus wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of greater than 0.52 MPa; b. a liquid air recuperator fluidly connected to said cryogenic pump configured to heat said pressurized liquid air and produce vaporized air; c. a combustor fluidly connected to said liquid air recuperator configured to burn a fuel in the presence of said vaporized air and produce combustor exhaust; d. a first turbine fluidly connected to said combustor configured to extract power from said combustor exhaust and produce a first turbine exhaust wherein said first turbine exhaust is fluidly connected to said liquid air recuperator; e. a separator fluidly connected to said liquid air recuperator wherein said separator is configured to separate liquid carbon dioxide from said first turbine exhaust; and f. a second turbine fluidly connected to said separator to extract power from said first turbine exhaust. ### Claim 2 (depends on 1) The liquid air energy release apparatus of claim 1 wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure in the range of greater than 0.52 MPa to 50 MPa. ### Claim 3 (depends on 1) The liquid air energy release apparatus of claim 1 including a cooling apparatus fluidly connected between said liquid air recuperator and said separator. ### Claim 4 A method for releasing the energy of liquid air comprising: a. providing liquid air at a pressure of greater than 0.52 MPa; b. directing said pressurized liquid air to a liquid air recuperator to heat and vaporize said pressurized liquid air and producing vaporized air; c. directing said vaporized air to a combustor and burning of a fuel in the presence of said vaporized air and producing combustor exhaust; d. directing said combustor exhaust to a first turbine and extracting power from said combustor exhaust and producing a first turbine exhaust; and e. directing said first turbine exhaust to said liquid air recuperator to assist in said heating and vaporizing of said pressurized liquid air and then into a separator and separating liquid carbon dioxide from said first turbine exhaust; f. directing said first turbine exhaust after separation of said liquid carbon dioxide to a second turbine and extracting power from said first turbine exhaust. ### Claim 5 (depends on 4) The method of claim 4 wherein said liquid air is at a pressure in the range of greater than 0.52 MPa to 50 MPa. ### Claim 6 (depends on 4) The method of claim 4, including the step of cooling said first turbine exhaust prior after passing through said liquid air separator and before separating said liquid carbon dioxide. ### Claim 7 (depends on 4) The method of claim 4 wherein said first turbine exhaust, after separation of liquid carbon dioxide, indicates a combined level of carbon dioxide and water that is at or below 5.0% by volume. ### Claim 8 (depends on 4) The method of claim 4 wherein said first turbine gas, prior to introduction into said separator for removal of liquid carbon dioxide, is introduced into a water separator and removing liquid water. ### Claim 9 A apparatus for liquid air energy release comprising: a. a liquid air storage apparatus containing liquid air and a cryogenic pump fluidly connected to said liquid air storage apparatus wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of greater than 0.52 M Pa; b. a liquid air recuperator fluidly connected to said cryogenic pump wherein said liquid air recuperator is also connected to a carbon dioxide separator for removal of liquid carbon dioxide and to a water separator for removal of water from a first turbine exhaust, wherein said liquid air recuperator is configured to heat said pressurized liquid air and produce vaporized air; c. a combustor fluidly connected to said liquid air recuperator configured to burn a fuel in the presence of said vaporized air and produce combustor exhaust; d. a first turbine fluidly connected to said combustor configured to extract power from said combustor exhaust and produce said first turbine exhaust wherein said first turbine exhaust is fluidly connected to an exhaust air recuperator which exhaust air recuperator is fluidly connected to said water separator and said water separator is fluidly connected to said liquid air recuperator and said liquid air recuperator is fluidly connected to said carbon dioxide separator and said carbon dioxide separator is fluidly connected to said exhaust air recuperator; and e. a second turbine fluidly connected to said exhaust air recuperator to extract power from said first turbine exhaust. ### Claim 10 (depends on 9) The liquid air energy release apparatus of claim 9 wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of 0.52 MPa to 50 MPa. ### Claim 11 (depends on 9) The liquid air energy release apparatus of claim 9 wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of 0.52 MPa to 30 MPa. ### Claim 12 (depends on 9) The liquid air energy release apparatus of claim 9 includes a cooling apparatus fluidly connected between said liquid air recuperator and said carbon dioxide separator. ### Claim 13 A method for liquid air energy release comprising: a. providing liquid air at a pressure of greater than 0.52 MPa; b. directing said pressurized liquid air to a liquid air recuperator to heat and vaporize said pressurized liquid air and producing vaporized air; c. directing said vaporized air to a combustor and burning a fuel in the presence of said vaporized air and producing combustor exhaust; d. directing said combustor exhaust to a first turbine and extracting power from said combustor exhaust and producing a first turbine exhaust; e. directing said first turbine exhaust to an exhaust air recuperator to assist in heating of said exhaust air followed by a water separator and separating liquid water from said first turbine exhaust; f. directing said first turbine exhaust emerging from said water separator through said liquid air recuperator followed by a carbon dioxide separator and separating liquid carbon dioxide from said first turbine exhaust and providing said first turbine exhaust gas that is substantially devoid of carbon dioxide and water; g. directing said first turbine exhaust that is substantially devoid of carbon dioxide and water through said exhaust gas recuperator and heating said first turbine exhaust gas and directing said heated first turbine exhaust gas through a second turbine and extracting power. ### Claim 14 (depends on 13) The method of claim 13 wherein said first turbine exhaust that is substantially devoid of carbon dioxide and water, indicates a combined level of carbon dioxide and water that is at or below 5.0% by volume. ### Claim 15 A liquid air energy release apparatus comprising: a. a liquid air storage apparatus containing liquid air and a cryogenic pump fluidly connected to said liquid air storage apparatus wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of greater than 0.52 M Pa; b. an organic Rankine cooler connected to said cryogenic pump wherein said organic Rankine cooler contains a working fluid wherein said organic Rankine cooler is fluidly connected to a pump to increase the working fluid pressure, which said organic Rankine cooler is fluidly connected to an organic Rankine recuperator and organic Rankine heater, wherein said working fluid is expanded and is fluidly connected to a turbine to extract power from said expanded working fluid, and wherein said expanded working fluid is then passed through said organic Rankine recuperator and then back into said organic Rankine cooler and then into said pump; c. a second liquid air recuperator fluidly connected to said organic Rankine cooler and a first liquid air recuperator connected to said second liquid air recuperator which second and first liquid air recuperators transfer heat to vaporized air; d. a combustor fluidly connected to said second liquid air recuperator wherein said combustor burns fuel in the presence of said vaporized air and produces combustor exhaust; e. a first turbine fluidly connected to said combustor to extract power from said combustor exhaust and produce a first turbine exhaust; f. a water separator to remove liquid water from said first turbine exhaust; g. a carbon dioxide separator to remove liquid carbon dioxide from said first turbine exhaust. ### Claim 16 A liquid air energy release apparatus comprising: a. a liquid air storage apparatus containing liquid air and a cryogenic pump fluidly connected to said liquid air storage apparatus wherein said cryogenic pump is configured to provide pressurized liquid air at a pressure of greater than 0.52 MPa; b. a liquid air recuperator fluidly connected to said cryogenic pump configured to heat said pressurized liquid air and produce vaporized air; c. a combustor fluidly connected to said liquid air recuperator configured to burn a fuel in the presence of said vaporized air and produce combustor exhaust; d. a first turbine fluidly connected to said combustor configured to extract power from said combustor exhaust and produce a first turbine exhaust wherein said first turbine exhaust is fluidly connected to said liquid air recuperator; and e. a separator fluidly connected to said liquid air recuperator wherein said separator is configured to separate liquid carbon dioxide from said first turbine exhaust including a cooling apparatus fluidly connected between said liquid air recuperator and said separator. ### Claim 17 A method for releasing the energy of liquid air comprising: a. providing liquid air at a pressure of greater than 0.52 MPa; b. directing said pressurized liquid air to a liquid air recuperator to heat and vaporize said pressurized liquid air and producing vaporized air; c. directing said vaporized air to a combustor and burning of a fuel in the presence of said vaporized air and producing combustor exhaust; d. directing said combustor exhaust to a first turbine and extracting power from said combustor exhaust and producing a first turbine exhaust; and e. directing said first turbine exhaust to said liquid air recuperator to assist in said heating and vaporizing of said pressurized liquid air and then into a separator and separating liquid carbon dioxide from said first turbine exhaust, wherein said first turbine exhaust prior to introduction into said separator for removal of liquid carbon dioxide, is introduced into a water separator and removing liquid water.