Integration of pressure swing adsorption with a power plant for CO2 capture/utilization and N2 production
First Claim
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1. A method for production of N2 and CO2 from a reactor exhaust stream, comprising:
- passing the reactor exhaust stream comprising at least about 70 vol % N2 and at least about 10 vol % CO2 into a swing adsorption reactor comprising an adsorbent material, the reactor exhaust stream in the swing adsorption reactor having a pressure between about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa);
adsorbing CO2 on the adsorbent material at an adsorption temperature of at least 400°
C.;
recovering an N2 stream with a purity of at least about 95 vol % from a forward end of the swing adsorption reactor, the recovered N2 stream having a pressure that differs from the pressure of the reactor exhaust stream by about 0.5 bar (about 50 kPa) or less;
reducing the pressure in the swing adsorption reactor to a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) by outputting a blow down stream from at least one of forward end or an aft end of the swing adsorption reactor; and
purging the swing adsorption reactor with a steam purge at a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) to generate a CO2 recovery stream, the CO2 recovery stream comprising at least about 90% of the CO2 present in the reactor exhaust stream, the steam purge containing less than about 1.0 moles of H2O per mole of CO2 in the reactor exhaust stream.
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Abstract
Systems and methods are provided for combined cycle power generation while reducing or mitigating emissions during power generation. Recycled exhaust gas from a power generation combustion reaction can be separated using a swing adsorption process so as to generate a high purity CO2 stream while reducing/minimizing the energy required for the separation and without having to reduce the temperature of the exhaust gas. This can allow for improved energy recovery while also generating high purity streams of carbon dioxide and nitrogen.
19 Citations
22 Claims
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1. A method for production of N2 and CO2 from a reactor exhaust stream, comprising:
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passing the reactor exhaust stream comprising at least about 70 vol % N2 and at least about 10 vol % CO2 into a swing adsorption reactor comprising an adsorbent material, the reactor exhaust stream in the swing adsorption reactor having a pressure between about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa); adsorbing CO2 on the adsorbent material at an adsorption temperature of at least 400°
C.;recovering an N2 stream with a purity of at least about 95 vol % from a forward end of the swing adsorption reactor, the recovered N2 stream having a pressure that differs from the pressure of the reactor exhaust stream by about 0.5 bar (about 50 kPa) or less; reducing the pressure in the swing adsorption reactor to a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) by outputting a blow down stream from at least one of forward end or an aft end of the swing adsorption reactor; and purging the swing adsorption reactor with a steam purge at a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) to generate a CO2 recovery stream, the CO2 recovery stream comprising at least about 90% of the CO2 present in the reactor exhaust stream, the steam purge containing less than about 1.0 moles of H2O per mole of CO2 in the reactor exhaust stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for production of N2 and CO2 from a reactor exhaust stream, comprising:
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compressing the reactor exhaust stream to generate a compressed recycle exhaust gas, the compressed recycle exhaust gas having a recycle temperature from about 400°
C. to about 500°
C. and a recycle pressure from about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa), the recycled exhaust gas comprising at least about 70 vol % of N2 and at least about 10 vol % of CO2;separating CO from N2 in at least a portion of the compressed recycle exhaust gas in a cyclical pressure swing adsorption process, the cyclical pressure swing adsorption process cycle comprising; passing the at least a portion of the compressed recycle exhaust gas into a swing adsorption reactor comprising an adsorbent material, the reactor exhaust stream in the swing adsorption reactor having a pressure between about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa); adsorbing CO2 on the adsorbent material at an adsorption temperature that differs from the recycle temperature by less than about 20°
C. and at an adsorption pressure that differs from the recycle pressure by less than about 1 bar (0.1 MPa);recovering an N2 stream with a purity of at least about 95 vol % from a forward end of the swing adsorption reactor, the recovered N2 stream having a pressure that differs from the pressure of the reactor exhaust stream by about 0.5 bar (about 50 kPa) or less, the recovered N2 stream having a temperature that differs from the recycle temperature by 20°
C. or less;reducing the pressure in the swing adsorption reactor to a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) by outputting a blow down stream from at least one end of the swing adsorption reactor; purging the swing adsorption reactor with a steam purge at a pressure from about 1.0 bara (about 0.1 MPaa) to about 4.0 bara (about 0.4 MPaa) to generate a CO2 recovery stream, the CO2 recovery stream comprising at least about 90% of the CO2 present in the reactor exhaust stream, the steam purge containing less than about 1.0 moles of H2O per mole of CO2 in the reactor exhaust stream; and separating the CO2 recovery stream into a CO2 product stream and water, the CO2 product stream containing at least about 90 vol % of CO2, wherein the at least a portion of the compressed recycle exhaust gas and the steam purge comprise at least about 95 vol % of gases introduced into the swing adsorption reactor during the cyclical pressure swing adsorption process cycle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for production of N2 and CO from a reactor exhaust stream, comprising:
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compressing the reactor exhaust stream to generate a compressed recycle exhaust gas, the compressed recycle exhaust gas having a recycle temperature from about 400°
C. to about 500°
C. and a recycle pressure from about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa), the recycled exhaust gas comprising at least about 70 vol % of N2 and at least about 10 vol % of CO2;separating CO2 from N2 in at least a portion of the compressed recycle exhaust gas in a cyclical pressure swing adsorption process, the cyclical pressure swing adsorption process cycle comprising; passing the at least a portion of the compressed recycle exhaust gas into a swing adsorption reactor comprising an adsorbent material, the reactor exhaust stream in the swing adsorption reactor having a pressure between about 10 bara (about 1.0 MPaa) to about 30 bara (about 3.0 MPaa); adsorbing CO2 on the adsorbent material at an adsorption temperature that differs from the recycle temperature by less than about 20°
C. and at an adsorption pressure that differs from the recycle pressure by less than about 1 bar (0.1 MPa);recovering an N2 stream with a purity of at least about 95 vol % from a forward end of the swing adsorption reactor, the recovered N2 stream having a pressure that differs from the pressure of the reactor exhaust stream by about 0.5 bar (about 50 kPa) or less, the recovered N2 stream having a temperature that differs from the recycle temperature by 20°
C. or less;reducing the pressure in the swing adsorption reactor to a pressure from about 1.0 bara (about 0.1 MPaa) to about 5.0 bara (about 0.5 MPaa) by outputting a blow down stream from at least one end of the swing adsorption reactor; purging the swing adsorption reactor with a steam purge at a pressure from about 1.0 bara (about 0.1 MPaa) to about 5.0 bara (about 0.4 MPaa) to generate a CO2 recovery stream, the CO2 recovery stream comprising at least about 60% of the CO2 present in the reactor exhaust stream, the steam purge containing less than about 1.5 moles of H2O per mole of CO2 in the reactor exhaust stream; and separating the CO2 recovery stream into a CO2 product stream and water, the CO2 product stream containing from about 60 vol % to about 99.5 vol % of CO2, wherein the at least a portion of the compressed recycle exhaust gas and the steam purge comprise at least about 90 vol % of the gases introduced into the swing adsorption reactor during a process cycle.
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Specification