System and method for carbon capture

Abstract

A system (10) includes a turbine (56) configured to rotate a rotary shaft (118) about an axis of rotation (700). The system (10) further includes a gas capture system (20) having an absorber (452) configured to absorb an undesirable gas (542) from an exhaust gas (62) into a solvent (544). The gas capture system (20) also includes a stripper (454) configured to strip the undesirable gas (542) from the solvent (562). Additionally, the gas capture system (20) includes a solvent circuit (458) coupled to the absorber (452) and the stripper (454). The solvent circuit (458) is configured to circulate the solvent (544) through the absorber (452) and the stripper (454). Furthermore, the turbine (56) is configured to rotate at least one of the absorber (452) or the stripper (454).

Description

SYSTEM AND METHOD FOR CARBON CAPTUREBACKGROUND

[0001] The present application relates generally to a system and method for capturing undesirable gases associated with a combustion system, such as a combustion-driven power plant.

[0002] An industrial plant, such as a combustion-driven power plant, may produce a variety of gases, such as an exhaust gas of a combustion system. The combustion system may include a gas turbine engine, a reciprocating piston-cylinder engine, a furnace, a boiler, or other industrial equipment. These exhaust gases may include one or more undesirable gases, such as acid gases and / or greenhouse gases. For example, the undesirable gases may include carbon oxides (COx) such as carbon dioxide (CO2) and carbon monoxide (CO), nitrogen oxides (NOx) such as nitrogen dioxide (NO2), and / or sulfur oxides (SOx) such as sulfur dioxide (SO2). CO2 is both an acid gas and a greenhouse gas. Unfortunately, the atmospheric content of CO2 has generally increased over thousands of years, and currently exceeds about 420 parts per million by volume (ppmv) or 643 parts per million by weight (ppmw) in the atmosphere. With various regulations and environmental concerns regarding global warming, it would be desirable to reduce the output of undesirable gases (e.g., CO2) into the atmosphere, particularly for hydrocarbon fuel consuming equipment such as combustion systems.BRIEF DESCRIPTION

[0003] Certain embodiments commensurate in scope with the originally claimed subject matter are summarized below. These embodiments are not intended to limit the scope of the claimed subject matter, but rather these embodiments are intended only to provide a brief summary of possible forms of the subject matter. Indeed, the subject matter may encompass a variety of forms that may be similar to or different from the embodiments set forth below.

[0004] In a first embodiment, a system includes a turbine configured to rotate a rotary’ shaft about an axis of rotation. The system further includes a gas capture system (e.g., carbon dioxide capture system) having an absorber configured to absorb an undesirable gas from an exhaust gas into a solvent. The gas capture system also includes a stripper configured to strip the undesirable gas from the solvent. Additionally, the gas capture system includes a solvent circuit coupled to the absorber and the stripper. The solvent circuit is configured to circulate the solvent through the absorber and the stripper. Furthermore, the turbine is configured to rotate at least one of the absorber or the stripper.

[0005] In a second embodiment, a gas capture system includes at least one of an absorber or a stripper of the gas capture system. The absorber is configured to absorb an undesirable gas from an exhaust gas into a solvent, and the stripper is configured to strip the undesirable gas from the solvent. The gas capture system further includes a rotary’ shaft coupled to the at least one of the absorber or the stripper. The rotary shaft is configured to be driven by a turbine to rotate the at least one of the absorber or the stripper.

[0006] In a third embodiment, a combustion-driven power plant includes a gas turbine configured to drive a shaft. Additionally, the combustion-driven power plant includes a rotating carbon capture system configured to remove carbon dioxide from an exhaust gas of the gas turbine, wherein the rotating carbon capture system is coupled to and configured to rotate about the shaft.BRIEF DESCRIPTION OF THE DRAWINGS

[0007] These and other features, aspects, and advantages of the subject matter will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:

[0008] FIG. 1 is a block diagram of an embodiment of a combined cycle system having a gas capture system.

[0009] FIG. 2 is a schematic view of an embodiment of the combined cycle power plant of FIG. I . further illustrating an embodiment of the gas capture system.

[0010] FIG. 3 is a schematic view of an embodiment of the gas capture system of FIG. 2, illustrating a rotary shaft coupled to a gas turbine.

[0011] FIG. 4 is a schematic view of an embodiment of the gas capture system of FIG. 2, including an exhaust gas compressor system.

[0012] FIG. 5 is a schematic view of an embodiment of the gas capture system of FIG. 2, including an auxiliary steam turbine.DETAILED DESCRIPTION

[0013] One or more specific embodiments of the subject matter will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers’ specific goals, such as compliance with system- related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.

[0014] When introducing elements of various embodiments of the subject matter, the articles “a.” “an,” “the,” and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0015] The disclosed embodiments include systems and methods to reduce the carbon footprint of combustion systems, such as combustion-driven power plantsand / or combined cycle power plants, using a gas treatment system having one or more gas capture systems. The gas capture systems are configured to remove undesirable gases (e.g., CO2) from the exhaust gas of the combustion systems. The disclosed embodiments include a rotating gas capture system having a rotary shaft that is rotationally coupled to a shaft of a turbine (e.g., gas turbine). The rotation of the gas capture system may be particularly advantageous with solvent-based gas capture system, wherein the rotation imparts a centrifugal force to enhance mass transfer of the gas to a solvent to enable use of high viscosity solvents. The high viscosity solvents improve the efficiency of absorption, desorption, and heat transfer. In particular, the increased density of the solvent enables more efficient absorption and desorption of the undesirable gases (e.g., CO2), thereby enabling a reduction in a flow rate of the solvent, a size reduction in the carbon capture system, and a reduced reboiler duty. In certain embodiments, the rotation of the gas capture system enables a size reduction of at least 40, 50. or 60 percent of the gas capture system. The rotation of the gas capture system also enables use of high viscosity solvents in a solvent-based gas capture system.

[0016] FIG. 1 is a block diagram of an embodiment of a combined cycle system 10 having a gas turbine system 12, a steam turbine system 14. a heat recovery steam generator (HRSG) 16, a gas treatment system 18 having one or more gas capture systems 20, and a controller 22 coupled to each of the systems 12, 14, 16, and 18. As discussed below, the one or more gas capture systems 20 of the gas treatment system 18 are configured to capture an undesirable gas (e.g., CO2) from exhaust gas and / or air (e.g., direct air capture), wherein the gas capture systems 20 rotate via a shaft of the gas turbine system 12.

[0017] Before discussing details of the gas treatment system 18, various aspects of the combined cycle system 10 are discussed in further detail. For purposes of orientation in the drawings, reference may be made to an axial direction or axis 40, a radial direction or axis 42 extending radially away from the axial direction or axis 40, and a circumferential direction or axis 44 extending circumferentially around the axial direction or axis 40. The directions or axes 40, 42, and 44 may be in reference to a rotational axis 36 of the gas turbine system 12, for example.

[0018] The gas turbine system 12 includes an air intake 50, a compressor 52 having one or more compressor stages, one or more combustors 54, a turbine 56 having one or more turbine stages, and a load 58 (e.g., electrical generator) driven by the turbine 56. In certain embodiments, the gas turbine system 12 further includes an exhaust gas recirculation (EGR) system 60 configured to recirculate an exhaust gas 62 into the air intake 50. The recirculated exhaust gas 62 helps to reduce the temperature and formation of certain emissions (e.g., nitrogen oxides (NOx)) associated with combustion in the combustors 54. In operation, the compressor 52 receives air (and also exhaust gas 62 if the EGR system 60 is active) from the air intake 50, and compresses the air and / or exhaust gas 62 in one or more compressor stages (e.g., stages of rotating compressor blades). The combustors 54 then combust fuel from a fuel supply system with the compressed air and / or exhaust gas, and generate hot combustion gases. The hot combustion gases expand and drive one or more turbine stages (e.g., stages of rotating turbine blades) in the turbine 56, thereby driving rotation of the compressor 52 and the load 58 via a gas turbine shaft 64. The turbine 56 then outputs the hot combustion gases as the exhaust gas 62.

[0019] The HRSG 16 recovers waste heat from the exhaust gas 62 to generate steam for driving the steam turbine system 14. The HRSG 16 includes a high- pressure (HP) steam section 70, an intermediate-pressure (IP) steam section 72, and a low-pressure (LP) steam section 74 configured to generate HP steam 76, IP steam 78, and LP steam 80. The steam turbine system 14 may include an HP steam turbine 82 driven by the HP steam 76, an IP steam turbine 84 driven by the IP steam 78, and a LP steam turbine 86 driven by the LP steam 80. In addition to the steam provided by the HRSG 16, the HP steam turbine 82 provides IP steam to the IP steam turbine 84, and the IP steam turbine 84 provides LP steam to the LP steam turbine 86. The LP steam turbine 86 then outputs any remaining steam / water to a condensate line 88 coupled to the LP steam section 74 of the HRSG 16. The condensate line 88 may include a condenser 90 configured to condense any remaining steam to form a condensate, and a pump 92 configured to pump the condensate back to the LP steam section 74. In operation, the steam turbine system 14 drives a load 94 (e.g., electrical generator) via a steam turbine shaft 96. In certain embodiments, the steam turbinesystem 14 and / or the HRSG 16 may provide heated water and / or steam (e.g., HP steam 76, IP steam 78. and / or LP steam 80) to the gas treatment system 18 to support a desorption mode of the one or more gas capture systems 20. For example, the gas capture systems 20 may receive heated water and / or steam in a temperature range of 100 to 150 degrees Celsius, 110 to 150 degrees Celsius, 120 to 150 degrees Celsius, or 130 to 150 degrees Celsius. Additionally, the steam turbine system 14 may drive an exhaust gas compressor system to compress the exhaust gas as part of the gas treatment system 18.

[0020] After the HRSG 16, the exhaust gas 62 may flow to the EGR system 60 and / or the gas treatment system 18. In the illustrated embodiment, the exhaust gas 62 flows through one or more gas capture systems 20 configured to capture undesirable gases. The undesirable gases may include carbon oxides (COx) (e.g., carbon dioxide (CO2) and carbon monoxide (CO)), nitrogen oxides (NOx) (e.g., nitrogen dioxide (NO2)). sulfur oxides (SOx) (e.g.. sulfur dioxide (SO2)), or any combination thereof. In the following discussion, CO2 may be used as an example of the undesirable gases; however, the gas capture systems 20 may be designed to capture any of the foregoing undesirable gases. For example, the gas capture systems 20 include one or more carbon capture systems 100 (e.g., CO2 capture systems). The gas capture systems 20 (e.g., carbon capture systems 100) may include sorbent-based gas capture systems, solvent-based gas capture systems, cryogenic gas capture systems, or any combination thereof, configured to remove and capture undesirable gases. The carbon capture system 100 may include components 102, 104, 106, and 108 configured to enable gas capture of undesirable gases (e.g.. CO2) from the exhaust gas 62. thereby outputting a treated gas 110 and a captured gas 112 (e.g., CO2). The treated gas 110 may be substantially free of the undesirable gases (e.g., CO2) and may be discharged through an exhaust stack. The captured gas 112 (e.g., CO2) may be compressed by a compression system 114 and stored and / or transported by a storage and / or pipeline system 116.

[0021] In certain embodiments, the carbon capture system 100 is a solvent-based carbon capture system, and the components 102, 104, 106, and / or 108 include one or more absorbers, strippers, and associated equipment. For example, the absorber isconfigured to absorb undesirable gases (e.g., CO2) into a solvent, thereby outputting the treated gas 110 through an exhaust stack and a CCh-rich solvent to the stripper. The stripper is configured to apply heat to the CCh-rich solvent, thereby stripping the undesirable gases (e.g., CO2) from the solvent to produce the captured gas 112 and a CCh-lean solvent. The stripper may receive heat via a heat source, such as a heated gas and / or liquid (e.g., steam). The stripper returns the CCh-lean solvent to the absorber to repeat the cycle.

[0022] In certain embodiments, the carbon capture system 100 may be a rotating carbon capture system configured to facilitate mass and / or heat transfer between the solvent and gas (e.g., exhaust gas 62) by applying a centrifugal force to the absorber and / or the stripper. The carbon capture system 100 may include a rotary shaft 118 coupled to the components 102, 104, 106, and / or 108. As the components 102, 104, 106, and / or 108 spin about the rotary shaft 118 the solvent may flow radially outward from an inner portion of the absorber and / or the stripper through a packing material. At the same time, the gas may flow radially inward through the packing material, facilitating counter current contact between the gas and the solvent. As a result, the solvent may efficiently absorb and exchange heat with the gas. The rotary shaft 118 may be a single shaft extending through any or all of the components 102, 104, 106, and / or 108. Alternatively, each or any of the components 102, 104, 106, and / or 108 may be coupled to a separate rotary shaft, and each separate rotary shaft may be coupled to one another (e.g., along an axis of rotation).

[0023] In certain embodiments, the rotary shaft 118 of the carbon capture system 100 may be coupled to the gas turbine shaft 64. That is, rotation of the gas turbine shaft 64 may drive rotation of the rotary7shaft 118. For example, the combined cycle system 10 may include a gearbox 119 (e.g., transmission, gear assembly, etc.) or a shaft coupling configured to transmit torque between the gas turbine system 12 and the carbon capture system 100. A first end (e.g., input end) of the gearbox 119 may be coupled to the gas turbine shaft 64, and a second end (e.g., output end) of the gearbox 119 may be coupled to the rotary shaft 118 of the carbon capture system 100. For example, the absorber and / or the stripper may directly receive a torque output of the gearbox 119. In this way, the gas turbine shaft 64 mayprovide torque to the carbon capture system 100 to power the centrifugal effect of the absorber and / or the stripper. Simultaneously, the gas turbine shaft 64 may drive (e.g.. power) the load 58. In certain embodiments, the gas turbine shaft 64 and the rotary shaft 118 may be aligned along a common axis of rotation. Alternatively, the gas turbine shaft 64 and the rotary shaft 118 may be offset from one another and / or oriented in different planes entirely. The gearbox 119 may include a gear set (e.g., two or more gears) configured to change a speed or direction of the torque received transmitted from the gas turbine shaft 64. In any case, the gas turbine shaft 64 may be coupled to the rotary' shaft 118. Thus, rotation of the gas turbine shaft 64 may drive rotation of the rotary shaft 118.

[0024] In the illustrated embodiment, the controller 22 is configured to control all aspects of the combined cycle system 10. The controller 22 includes one or more processors 120, memory 122, instructions 124 stored on the memory 122 and executable by the processor 120, and communication circuitry 126 configured to communicate with sensors and various equipment of the combined cycle system 10. For example, the controller 22 is configured to receive sensor feedback from sensors coupled to the gas turbine system 12, the steam turbine system 14, the HRSG 16, and the gas treatment system 18 (e.g., gas capture systems 20), and control the same equipment based on the sensor feedback, operating modes, user input, computer models, or any combination thereof. The sensors may include temperature sensors, pressure sensors, flow rate sensors, gas composition sensors, or any combination thereof. In certain embodiments, the controller 22 is configured to control operation of the gas capture systems 20 (e.g., carbon capture systems 100), such by controlling modes of operation (e g., adsorption mode, desorption mode, and cooling mode), controlling heat sources for supplying heated fluid (e.g., steam) to the gas capture systems 20, controlling cooling sources for supply cooled fluids to the gas capture systems 20, controlling rotation of the absorber and the stripper of the gas capture systems 20, controlling solvent flow rates and exhaust gas flow rates through the absorber and the stripper of the gas capture systems 20, or any combination thereof.

[0025] FIG. 2 is a schematic of an embodiment of the combined cycle system 10 of FIG. 1, illustrating an embodiment of the carbon capture system 100 of the gastreatment system 18 having a solvent-based gas capture system 450. The solventbased gas capture system 450 may use one or more solvents for capturing the undesirable gases using an absorber 452 (e.g., absorber column) and a stripper 454 (e.g., stripper column). Example solvents include monoethanolamine (MEA), diglycolamine (DGA), advanced amine solvents, amino acid salts, carbonate solvents, aqueous ammonia, immiscible liquids, and ionic liquids. In certain embodiments, the gas turbine system 12 is configured to rotate the the solvent-based gas capture system450 (e.g., absorber 452 and stripper 454) to impart a centrifugal force on the solvent, thereby driving a solvent flow in a radial outward direction against a gas flow in a radial inward direction. As appreciated, the absorber 452 and stripper 454 may be modified to facilitate rotation, for example, by forming annular packings, chambers, and equipment inside annular configurations of the absorber 452 and stripper 454. The rotation enhances the absorption efficiency in the absorber 452 and the desorption efficiency in the stripper 454. For simplicity, FIG. 2 illustrates only a radial portion (e.g., half cross-section) of the absorber 452 extending from and driven to rotate about a rotational axis 451 and a radial portion (e.g., half cross-section) of the stripper 454 extending from and driven to rotate about a rotational axis 453. The rotational axis451 may be oriented in any suitable orientation, including but not limited to a horizontal axis, a vertical axis, or an angled axis between horizontal and vertical orientations. Thus, the illustrated orientation of the rotational axis 451 is not intended to be limiting. However, the absorber 452 includes radial portions extending from both sides of the rotational axis 451, such that the absorber 452 is symmetric about the rotational axis 451. Likewise, the stripper 454 includes radial portions extending from both sides of the rotational axis 453 such that the stripper 454 is symmetric about the rotational axis 453. Thus, the following discussion should be read with this symmeterical annular configuration in mind for the absorber 452 and stripper 454. The rotational axis 451 may be a vertical axis extending through a center of the absorber 452, and the rotational axis 453 may be the same vertical axis or an additional vertical axis extending through a center of the stripper 454.

[0026] The gas turbine system 12, the HRSG 16, and the steam turbine system 14 are substantially the same as discussed in detail above. In particular, the illustratedHRSG 16 includes the high-pressure (HP) steam section 70 (e.g., first section), the intermediate-pressure (IP) section 72 (e.g., second section), and the low-pressure (LP) section 74 (e.g., third pressure section), wherein each of the sections 70, 72, and 74 includes one or more heat exchangers and / or heat exchange components. The HRSG 16 may be configured to produce low-pressure steam for the carbon capture system 100 (e.g.. solvent-based gas capture system 450) while also cooling the exhaust gas 62 to a temperature range (e.g., within upper and lower temperature thresholds) suitable for gas capture in the carbon capture system 100 (e.g., solvent-based gas capture system 450). In certain embodiments, the carbon capture system 100 (e.g., solventbased gas capture system 450) may be configured to route heated fluid (e.g., steam and / or heated water) from the HRSG 16 and / or the steam turbine system 14 to one or more injection locations in the carbon capture system 100 (e.g., solvent-based gas capture system 450), wherein the steam may be high-pressure steam, intermediatepressure steam, and / or low-pressure steam extracted from one or more of the sections 70, 72, and / or 74 of the HRSG 16 and / or one of the steam turbines 82, 84, and / or 86 of the steam turbine system 14.

[0027] The solvent-based gas capture system 450 includes an absorber 452 (e.g., absorber column), a stripper 454 (e.g., stripper column), a gas circuit 456 (e.g., gas treatment circuit), a solvent circuit 458 (e.g., fluid absorbent circuit), and one or more steam circuits 460. Each of the gas circuit 456, the solvent circuit 458, and the steam circuits 460 includes one or more fluid conduits or lines, fluid manifolds, fluid splitters, fluid combiners, fluid mixing chambers, fluid valves, internal fluid paths through components, or any combination thereof. In operation, the gas circuit 456 is configured to route the exhaust gas 62 (or any other gas flow having undesirable gases) through the absorber 452, while the solvent circuit 456 is configured to route a solvent flow through the absorber 452 and the stripper 454. The gas circuit 456 includes a gas path 462 extending toward the absorber 452 between the HRSG 16 and the absorber 452, a gas path 464 extending radially inward through the absorber 452 toward the rotational axis 451, and a gas path 466 extending away from the absorber 452. The solvent circuit 458 extends through the absorber 452 and the stripper 454 in a loop, including a solvent path 468 extending radially outward through the absorber452 away from the rotational axis 45 1. a solvent path 470 extending from the absorber 452 to the stripper 454. a solvent path 472 extending radially outward through the stripper 454 away from the rotational axis 453, and a solvent path 474 extending from the stripper 454 to the absorber 452. The steam circuits 460 extend between the stripper 454, the HRSG 16, and the steam turbine system 14, thereby providing a plurality of steam sources to support operation of the stripper 454 using steam produced in the HRSG 16 and the steam turbine system 14. The steam circuits 460 may be configured to extract the steam at a pressure and a temperature suitable for transferring heat to the stripper 454 to reduce or eliminate a need for separate heat sources for the stripper 454. In certain embodiments, the steam circuits 460 may be configured to provide a high-pressure steam, an intermediate-pressure steam, and / or a low-pressure steam to the stripper 454. However, the stripper 454 may be well-suited for the intermediate-pressure steam and / or the low-pressure steam.

[0028] The steam circuits 460 may include any number and configurations of steam flow paths (e.g., conduits), connection locations, and control features to provide suitable heated fluid 168 (e.g., steam and / or heated water) to the stripper 454. The steam circuits 460 may fluidly and mechanically couple to the HRSG 16 and the steam turbine system 14 at one or more steam extraction locations 476 (e.g., extraction ports or connections), such as extraction locations 476 at, upstream of, downstream of, and between: the sections 70, 72, and 74 of the HRSG 16 and the steam turbines 82, 84, and 86. Additionally, the steam circuits 460 may fluidly and mechanically couple to the stripper 452 at one or more steam injection locations 478 (e.g., injection ports or connections), such as injection locations 478 at. upstream of. downstream of, and between components of the stripper 454. In certain embodiments, the solvent-based gas capture system 450 may have one or more of the steam circuits 460 with any combination of the steam extraction locations 476 and the steam injection locations 478. The steam circuits 460 may be independent steam circuits (e.g., separate steam paths or conduits) or interconnected steam circuits (e.g., fluidly coupled steam paths or conduits) having one or more common steam conduits, wherein the steam circuits 460 may include one or more valves 480 coupled to the controller 22 for selective control of the steam flows to the stripper 454.

[0029] As non-limiting examples, the steam circuits 460 may include a steam circuit 482 extending between the HRSG 16 and the stripper 454, a steam circuit 484 extending between the steam turbine system 14 and the stripper 454, and a steam circuit 486 extending between the steam turbine system 14 and the stripper 454. For example, the steam circuit 484 is fluidly and mechanically coupled to the steam turbine system 14 along a steam flow path 492 (e.g., steam conduit) between the IP steam turbine 84 and the LP steam turbine 86 at a steam extraction location 494 (e.g., extraction port or connection), and the steam circuit 484 is fluidly and mechanically coupled to the stripper 454 at a steam injection location 496 (e.g., injection port or connection). By further example, the steam circuit 486 is fluidly and mechanically coupled to the steam turbine system 14 at the LP steam turbine 86 at a steam extraction location 498 (e.g., extraction port or connection), and the steam circuit 486 is fluidly and mechanically coupled to the stripper 454 at a steam injection location 478, 500 (e.g., injection port or connection). In certain embodiments, each of the steam circuits 460 (e.g., 482, 484, and 486) may selectively couple to the stripper 454 at any one or more of the steam injection locations (e.g., 490, 496, and 500) using steam conduits, valves 480, manifolds, and other flow controls. The steam circuits 460 (e.g., 482, 484, and 486) are configured to provide heated fluid 168 (e.g., steam and / or heated water) to the stripper 454 at a temperature, a pressure, and a flow rate at least partially controlled by the valves 480 (e.g., controlled via the controller 22 and feedback from sensors 148) along the respective steam circuits 460 (e.g., 482, 484, and 486). Additional details of the steam circuits 460 (e.g., 482, 484, and 486) and the steam supply to the stripper 454 will be discussed below.

[0030] In certain embodiments, when extracting steam from the the LP steam turbine 86 (e.g., extraction location 498), or at the steam flow path 492 between the IP and LP steam turbines 108 and 110 (e.g., extraction location 494), the low-pressure steam may have a pressure ranging between about 1.1 to 10 Bar. However, the low- pressure steam may have a pressure ranging between about 1.1 to 7 Bar, 1.2 to 6 Bar, 1.3 to 5 Bar, 1.4 to 4 Bar, or 1.5 to 2 Bar. For example, the low-pressure steam may have a pressure less than 2, 3, 4, 5, 6, 7, 8, 9, or 10 Bar. Additionally, the pressure of steam extracted from the LP steam turbine 86 (e.g., extraction location 498) may beless than the pressure of the steam extracted from the steam flow path 492 between the IP and LP steam turbines 108 and 110 (e.g., extraction location 494). For example, the pressure of steam extracted at the extraction location 488 may range between 1 to 2 Bar (e.g., approximately 1.5 Bar), the pressure of steam extracted at the extraction location 498 may range between 1 to 2 Bar (e.g., approximately 1.7 Bar), and the pressure of steam extracted at the extraction location 494 may range between 4 to 6 Bar (e.g., approximately 5 Bar). However, the foregoing examples are not intended to limit the scope of the steam extraction in the gas treatment system 18, and thus any suitable temperature and pressure ranges are within the scope of the disclosed embodiments.

[0031] The absorber 452 may include a plurality of absorber sections 502 disposed inside of a vessel or enclosure 504, wherein the enclosure 504 includes a gas inlet 506, a gas outlet 508, a solvent inlet 510, and a solvent outlet 512. The enclosure 504 has a radially inner portion 514, a radially outer portion 516, and an intermediate portion 518 disposed radially between the radially inner and radially outer portions 514 and 516 relative to a radial axis 520 of the enclosure 504. The radially inner portion 514 includes a radially inner conduit portion 522 (e.g., axial conduit portion) having the gas outlet 508. Although illustrated at the radial axis 520, the radially inner conduit portion 522 and the gas outlet 508 may be arranged along the rotational axis 451. In certain embodimentes, the gas outlet 508 may be disposed coaxial or offset from the rotational axis 451 or at other locations along the radially inner portion 514. The intermediate portion 518 includes opposite end walls 524 extending along the radial axis 520. For example, the opposite end walls 524 may be opposite flat annular end walls, and the radially outer portion 516 may be an outer annular sidewall disposed symetrically about the rotational axis 451. In certain embodiments, the gas outlet 508 may be disposed in one of the end walls 524 along the radially inner portion 514. Additionally, the solvent inlet 510 may be disposed along the radially inner conduit portion 522 (e.g., axial conduit portion) or one of the end walls 524 in the radially inner portion 514. The radially outer portion 516 may include an annular plate 526In the illustrated embodiment, the gas inlet 506 and the solvent outlet 512 are disposed in one of the end walls 524 along the radially outerportion 516. However, in certain embodiments, the gas inlet 506 and / or the solvent outlet 512 may be disposed in the annular plate 526 in the radially outer portion 516. In some embodiments, the gas inlet 506 may include a plurality of gas inlets and / or the solvent outlet 512 may include a plurality of solvent outlets.

[0032] The plurality of absorber sections 502 within an interior volume 528 of the enclosure 504 may include any number and type of absorber sections 502, such as absorber sections 530, 532, 534, 536, 538, and 540, which may include any configuration of packings, support trays or screens, wire meshes, solvent distributors, or any combination thereof. For example, each packing may include a plurality of beads, balls, or mixture inducing structures, which are configured to facilitate mixing between a gas flow and a solvent flow in the absorber 452. Each support tray or screen may include a wire mesh, a plate having a plurality7of openings, or another suitable structure that holds the packing in position while permitting fluid flow of gas and solvent through the support tray or screen in opposite directions through the absorber 452. Each solvent distributor may include a plurality of solvent nozzles configured to distribute solvent across the interior volume 528. In some embodiments, the absorber sections 530, 534, 538, and 540 include wire meshes, while the absorber sections 532 and 536 include packings, support trays or screens, and solvent distributors. However, the absorber sections 502 (e.g., 530, 532, 534, 536, 538, and 540) are not limited to the illustrated configuration. In certain embodiments, each of the absorber sections 502 (e.g., 530, 532, 534, 536, 538, and 540) is an annular absorber section disposed about the rotational axis 451.

[0033] In operation, the absorber 452 is configured to create a crossflow or opposing flows of a gas 542 (e.g., exhaust gas) radially inward along the gas path 464 and a gas lean solvent 544 radially outward along the solvent path 468 within the interior volume 528. thereby facilitating gas absorption of certain undesirable gases (e.g., CO2) from the gas 542 into the gas lean solvent 544. As illustrated, at the radially outer portion 516, the gas 542 enters the absorber 452 through the gas inlet 506, and the gas 542 flows radially inward through the interior volume 528 of the absorber 452. The gas 542 entering the absorber 452 through the gas inlet 506 may form bubbles of the gas 542 that flow radially inward through the gas lean solvent 544within the interior volume 528. The gas 542 then passes through each subsequent absorber section 502 (e.g., 530, 532. 534, 536. 538, and 540).

[0034] At the intermediate portion 518 (or the radially inner portion 514), the solvent-based gas capture system 450 supplies the gas lean solvent 544 into the interior volume 528 using one or more solvent distributors, such as a solvent distribution manifold, solvent nozzles, or a grid of solvent injectors. The solventbased gas capture system 450 may supply the gas lean solvent 544 through the illustrated solvent inlet 510, or any number or arrangement of solvent inlets 510, at positions directly at, radially inward from, and / or radially outward from the absorber sections 502. The gas lean solvent 544 then flows radially outward through the interior volume 528 through each subsequent absorber section 502. As the gas lean solvent 544 passes through each absorber section 502, various mixing structures (e.g., packings, wire meshes, support trays, etc.) are configured to help mix the gas lean solvent 544 with the gas 542, thereby helping to absorb various undesirable gases from the gas 542 into the gas lean solvent 544. For example, the gas lean solvent 544 may be configured to absorb carbon dioxide (CO2) or other undesirable gases as discussed in detail above. As the absorption process occurs, heat is generated within the absorber 452, thereby raising the temperature of the solvent within the absorber 452.

[0035] During operation, the absorber 452 rotates about the rotational axis 451 via the rotary shaft 118 coupled to the gas turbine system 12. As noted above, FIG. 2 illustrates only a radial portion (e.g,. half cross-section) of the absorber 452 on one side of the rotational axis 451, yet it should be understood that radial portions of the absorber 452 extend on both sides of the rotational axis 451. Additional flow paths, conduits, manifolds, or any combination thereof, also may be incorporated into the absorber 452 to enable rotation of the absorber 452 about the rotational axis 451. while inputting and outputting the various gas and solvent flows. As the absorber 452 spins, centrifugal force distributes the gas lean solvent 544 radially outward in a radial direction along the solvent path 468 through the absorber sections 502. Meanwhile, the gas 542 is directed radially inward in a radial direction along the gas path 464 through the absorber sections 502. In this way, rotation of the absorber 452 producesa counterflow or crossflow between the gas 542 and the gas lean solvent 544. This crossflow may enhance absorption of the undesriable gases from the gas 542 into the gas lean solvent 544, as well as increase heat transfer between the gas 542 and the gas lean solvent 544. Additionally, the absorber 452 may be designed to be smaller than absorbers of non-rotating systems of a comparable capacity. Furthermore, the enhanced crossflow may enable use of solvents that are more viscous than traditional solvents, increasing the absorption capacity of the absorber or allowing a reduction in the size of the absorber 452.

[0036] In certain embodiments, rotation of the absorber 452 about the rotational axis 451 (e.g,. rotary shaft 118) may be dnven by the gas turbine system 12. For example, the gas turbine shaft 64 may be coupled to the rotary shaft 118 via the gearbox 119 as illustrated in FIG. 1. In a sense, the rotation of the carbon capture system 100 (e.g., absorber 452, stripper 454, rotary' shaft 118) may be understood to be part of the load 58 of the gas turbine system 12. That is. torque generated by the gas turbine system 12 is transmitted to the rotary shaft 1 18 to spin the absorber 452. In certain embodiments, the absorber 452 and / or the striper 454 may rotate at a rate between 100 and 1000 revolutions per minute. In certain embodiments, the controller 22 is configured to control the rotational speed of the absorber 452 and the stripper 454 via control of the gas turbine system 12, the gearbox 119, a clutch, various rotational controls, or any combination thereof.

[0037] In certain embodiments, a thermal control system 546 may be coupled to the absorber 452 to control the temperatures and improve the efficiency of the absorption process. For example, the thermal control system 546 may include a cooling circuit 548 coupled to the absorber 452, wherein the cooling circuit 548 includes a heat exchanger 550 (e.g., cooler) and a pump 552. The pump 552 is configured to circulate solvent through the heat exchanger 550 to cool the solvent by transferring heat away from the solvent to a cooling fluid, such as water or another coolant. Any number or configuration of thermal control systems 546 may be implemented in the absorber 452.

[0038] In certain embodiments, the absorber 452 also includes a water wash system 554 having a heat exchanger 556 (e.g., cooler) and a pump 558 disposed along a water wash circuit 560. In some embodiments, the absorber section 536, 538, and / or 540 may be configured to assist with the water wash process of the water wash system 554, while the absorber sections 530, 532, and 534 help to enhance mixing between the gas 542 and the gas lean solvent 544 to increase absorption of the undesirable gases. For example, the absorber section 536, 538, and / or 540 may be configured to help distribute water across the absorber 552 in the radially inner portion 514 for removing any dissolved solvent in the gas 542 flowing radially inward through the absorber 552. In some embodiments, the water wash system 554 may be eliminated or moved downstream from the absorber 452.

[0039] Eventually, the absorber 452 discharges a gas rich solvent 562 at the radially outer portion 516 through the solvent outlet 512, and the absorber 452 discharges the treated gas 564 at the radially inner portion 514 through the gas outlet 508. The treated gas 564 may be substantially free or stripped of one or more undesirable gases (e.g., CO2). In contrast, the gas rich solvent 562 may have absorbed the one or more undesirable gases (e.g., CO2). Accordingly, the gas rich solvent 562 may be described as a CO2 rich solvent (or other gas rich solvent depending on the undesirable gas), while the gas lean solvent 544 may be described as a CO2 lean solvent (or other gas lean solvent depending on the undesirable gas and the particular gas absorption occurring in the absorber 452). Similarly, the gas 542 may be described as a CO2 containing or rich gas (or other containing or rich gas depending on the undesirable gas), while the treated gas 564 may be described as a CO2 reduced, lean, or free gas (or other reduced, lean, or free gas depending on the undesirable gas and the particular gas absorption occurring in the absorber 452). The gas absorption discussed herein is intended to cover any one or more of the undesirable gases described herein, or any other regulated or greenhouse gases.

[0040] In certain embodiments, the gas circuit 456 may include one or more components upstream from the absorber 452. For example, the gas circuit 456 may include a gas cooler or gas cooling system, such as a direct contact cooler (DCC) 566, disposed along the gas path 462 (e.g., gas flow path) upstream from the absorber 452.The DCC 566 may include a cooling enclosure 568 that houses a wire mesh 570 and a cooling fluid distributor 572. wherein the cooling fluid distributor 572 includes a plurality of fluid nozzles 574. The DCC 566 also may include a cooling fluid circuit 576 having a pump 578 and a heat exchanger 580 (e.g., cooler), wherein the cooling fluid circuit 576 is coupled to the cooling fluid distributor 572 above the wire mesh 570 and a radially outer portion of the enclosure 568 below the wire mesh 570. The pump 578 is configured to circulate a cooling fluid (e.g., water or other liquid) through the DCC 566, while the heat exchanger 580 is configured to cool the cooling fluid by transferring heat away from the cooling fluid to another working fluid. The plurality of fluid nozzles 574 distribute the cooling fluid across an interior volume of the enclosure 568 (e.g., cooling fluid dispersion), while the DCC 566 routes a gas flow from a gas inlet 582 to a gas outlet 584 as indicated by arrow 586. Thus, the cooling fluid dispersion directly contacts and cools the gas flow (e.g., exhaust gas 62). In some embodiments, the gas circuit 456 also includes one or more fans 588 configured to boost a pressure and / or flow rate of the gas flow (e.g., exhaust gas 62) supplied to the absorber 452.

[0041] The solvent-based gas capture system 450 also may include a plurality of components along the solvent circuit 458 between the absorber 452 and the stripper 454. In the illustrated embodiment, the solvent circuit 458 includes a pump 590 and a heat exchanger 592 along the solvent path 470 from the absorber 452 to the stripper 454, and the solvent circuit 458 includes a pump 594, the heat exchanger 592, a heat exchanger 596. and a filter 598 along the solvent path 474 from the stripper 454 to the absorber 452. The pump 590 is configured to pump the gas rich solvent 562 along the solvent path 470 through the heat exchanger 592 to the stripper 454, while the pump 594 is configured to pump the gas lean solvent 544 along the solvent path 474 through the heat exchangers 596 and 598 and the filter 598 to the absorber 452. The heat exchanger 592 is configured to transfer heat away from the gas lean solvent 544 in the solvent path 474 to the gas rich solvent 562 in the solvent path 470, thereby cooling the gas lean solvent 544 and heating the gas rich solvent 562. The heat exchanger 596 is configured to cool the gas lean solvent 544 by transferring heat away from the gas lean solvent 544 to a coolant flow (e.g.. water or other liquidcoolant), thereby providing a cooled gas lean solvent 544 for supply to the absorber 452. The filter 598 is configured to filter and / or clean the gas lean solvent 544 for use in the absorber 452. In certain embodiments, the solvent circuit 458 may include additional components (e.g., heat exchangers, filters, valves, etc.) and / or exclude one or more of the illustrated components. The stripper 454 processes the gas rich solvent 562 as discussed below.

[0042] The stripper 454 includes a plurality of stripper sections 600 disposed inside of a vessel or enclosure 602, wherein the enclosure 602 includes a solvent inlet 604, a solvent outlet 606, and a gas outlet 608. The enclosure 602 has a radially inner portion 610, a radially outer portion 612, and an intermediate portion 614 disposed radially between the radially inner and radially outer portions 610 and 612 relative to a radial axis 616 of the enclosure 602. The radially inner portion 610 includes a radially inner conduit portion 618 (e.g., axial conduit portion) having the gas outlet 608. Although illustrated at the radial axis 616. the radially inner conduit portion 618 and the gas outlet 608 may be arranged along the rotational axis 453. In certain embodiments, the gas outlet 608 may be disposed coaxial or offset from the rotational axis 453 or at other locations along the radially inner portion 610. The intermediate portion 614 includes opposite end walls 620 extending along the radial axis 616. For example, the opposite end walls 620 may be opposite flat annular end walls, and the radially outer portion 612 may be an outer annular sidewall disposed symetrically about the rotational axis 453. In certain embodiments, the gas outlet 608 may be disposed in one of the end walls 620 along the radially inner portion 610. Additionally, the solvent inlet 604 may be disposed in the radially inner conduit portion 618 (e.g., axial conduit portion), one of the end walls 620 in the radially inner portion 610, or the intermediate portion 614. The radially outer portion 612 may include a annular plate 622. In the illustrated embodiment, the solvent outlet 606 is disposed in one of the end walls 620 along the radially outer portion 612. However, in certain embodiments, the solvent outlet 606 may be disposed in the annular plate 622 in the radially outer portion 612.

[0043] The plurality of stripper sections 600 within an interior volume 624 of the enclosure 602 may include any number and type of stripper sections 600, such asstripper sections 626, 628, 630, 632, and 634, which may include any configuration of packings, support trays or screens, wire meshes, solvent distributors having nozzles, steam distributors having nozzles, or any combination thereof. For example, each packing may include a plurality of beads, balls, or mixture inducing structures, which are configured to facilitate mixing between flows of a solvent flow (e.g., gas rich solvent 562) and a steam 636 in the stripper 454. Each support tray or screen may include a wire mesh, a plate having a plurality of openings, or another suitable structure that holds the packing in position while permitting fluid flow of the solvent (e.g., gas rich solvent 562) and the steam 636 through the support tray or screen. Each solvent distributor may include a plurality of solvent nozzles configured to distribute solvent across the interior volume 624. Each steam distributor may include a plurality of steam nozzles configured to distribute steam 636 across the interior volume 624. In some embodiments, the stripper sections 628, 630, and 634 include wire meshes, the stripper section 626 includes a packing and a support tray or screen, and the stripper section 632 includes a barrier plate or divider plate having one or more openings. However, the stripper sections 600 (e.g., 626, 628, 630, 632, and 634) are not limited to the illustrated configuration. In certain embodiments, each of the stripper sections 600 (e.g., 626, 628, 630, 632, and 634) is an annular stripper section disposed about the rotational axis 453.

[0044] In certain embodiments, the rotary shaft 1 18 may be coupled to the stripper 454 as well as to the absorber 452. That is, the absorber 452 and the stripper 454 may rotate about the rotational axes 451 and 453 via the rotary shaft 118 in alignment with one another (e.g., coaxial rotational axes 451 and 453). Alternatively, the stripper 454 may be coupled to an additional rotary shaft that is coupled to the rotary' shaft 118 or the gas turbine shaft 64. In any case, rotation of the stripper 454 may enhance mass and heat transfer between the steam 636 and the gas rich solvent 562.

[0045] During operation, the stripper 454 rotates about the rotational axis 453 via the rotary' shaft 118 coupled to the gas turbine system 12. As noted above, FIG. 2 illustrates only a radial portion (e.g,. half cross-section) of the stripper 454 on one side of the rotational axis 453, yet it should be understood that radial portions of thestripper 454 extend on both sides of the rotational axis 453. Additional flow paths, conduits, manifolds, or any combination thereof, also may be incorporated into the stripper 454 to enable rotation of the stripper 454 about the rotational axis 453, while inputting and outputting the various gas and solvent flows. As the stripper 454 spins, centrifugal force distributes the flow of the gas rich solvent 562 radially outward in a radial direction along the solvent path 472 through the stripper sections 600 (e.g., throught the packing). Meanwhile, the steam 636 is directed radially inward in a radial direction through the stripper sections 600 (e.g., through the packing). In this way, rotation of the stripper 454 produces crossflow between the steam 636 and the gas rich solvent 562. This crossflow may enhance extraction of the undesirable gases from the gas rich solvent 562 by the steam 636 by facilitating heat transfer between the gas rich solvent 562 and the steam 636. Additionally, the stripper 454 may be designed to be smaller than strippers of non-rotating systems of a comparable capacity.

[0046] In certain embodiments, rotation of the stripper 454 about the rotational axis 453 (e.g., rotary shaft 118) may be driven by the gas turbine system 12. For example, the gas turbine shaft 64 may be coupled to the rotary shaft 118 via the gearbox 119 as illustrated in FIG. 1. In a sense, the rotation of the carbon capture system 100 (e.g., absorber 452, stripper 454, rotary shaft 118) may be understood to be part of the load 58 of the gas turbine system 12. That is, torque generated by the gas turbine system 12 is transmitted to the rotary7shaft 118 to spin the stripper 454. In certain embodiments, the absorber 452 and / or the stripper 454 may rotate at a rate between 600 and 1000 revolutions per minute.

[0047] In certain embodiments, rotation of the rotary' shaft 118 may be driven by the steam turbine system 14. For example, the steam turbine shaft 96 of the steam turbine system 14 may be coupled to the rotary shaft 118, with our without a gearbox 1 19 interposed between the steam turbine shaft 96 and the rotary shaft 118. The steam turbine system 14 may be designed to output a suitable speed to rotate the rotary' shaft 118. In a sense, the rotation of the carbon capture system 100 (e.g., absorber 452, stripper 454, rotary shaft 118) may be understood to be part of the load 58 of the steam turbine system 14. That is, torque generated by the steam turbinesystem 14 may be transmitted to the rotary shaft 118 to spin the absorber 452 and / or the stripper 454. Additionally, the steam turbine system 14 may drive rotation of an exhaust gas compressor system (shown in FIG. 4) to compress the exhaust gas 62 upstream of the absorber 452.

[0048] In certain embodiments, the combined cycle system 10 may include an auxiliary steam turbine 637 configured to drive rotation of the rotary shaft 1 18. As discussed above, the steam circuit 484 is configured to direct steam from the steam turbine system 14 and / or the HRSG 16 to other parts of the carbon captures sytem 100. A portion of the steam extracted from the steam flow path 492 at the steam extraction location 494 may be directed to a reboiler 644 to heat the solvent in the stripper 454. A remaining portion of the steam extracted from the steam flow path 492 may be directed to the auxiliary steam turbine 637 to drive the rotary shaft 118. The auxiliary steam turbine 637 may be configured to rotate about the same axis of rotation as the absorber 452, the stripper 454, and / or the rotary shaft 118.

[0049] For illustrative purposes, the absorber 452 and the stripper 454 are depicted offset from one another. However, it should be understood that the absorber 452 and the stripper 454 may share a common rotary shaft 118 and thus, a common axis of rotation. Furthermore, the rotary shaft 1 18 may share a common axis of rotation with the gas turbine shaft 64. Thus, the absorber 452, the stripper 454, and / or the gas turbine shaft 64 may be aligned along a single axis of rotation. Alternatively, the absorber 452 and the stripper 454 may have different rotary shafts along different (e.g., parallel) rotational axes. Still, the rotation of the absorber 452 may be coupled to the rotation of the stripper 454, may be coupled to the rotation of the gas turbine shaft 64. For example, the gearbox 119 may convert input torque from the gas turbine shaft 64 into output torques for two separate rotary shafts 118 simultaneously, corresponding to the absorber 452 and the stripper 454.

[0050] In certain embodiments, the DCC may also be configured to rotate about the same axis (e.g., rotational axes 451 and / or 453) as the absorber 452 and / or the stripper 454. For example, the DCC 566 may be rotationally coupled to the rotary shaft 118, the gas turbine shaft 64, and / or the steam turbine shaft 96. In this way,rotation of the gas turbine 64 may drive rotation of the DCC 566 in addition to the absorber 452 and the stripper 454. Rotation of the DCC 566 may enhance heat exchange between the cooling fluid and the exhaust gas 62.

[0051] As discussed above with reference to FIG. 1, the stripper 454 is configured to strip the undesirable gases from the gas rich solvent 562 using the heated fluid 168 (e.g., steam and / or heated water) extracted from the HRSG 16 and / or the steam turbine system 14 and supplied to the carbon capture system 100 (e.g., solvent-based gas capture system 450) via the steam circuits 460, waste heat recovered by the HRSG 16, or a combination thereof. In the illustrated embodiment, the steam circuits 460 (e.g., steam circuits 482, 486) are coupled to various steam extraction locations (e.g., 498) and steam injection locations 478 to provide heat in the form of the heated fluid 168 (e.g., steam and / or heated water) for supporting the stripper 454. Each of these steam circuits 460 (e.g., steam circuits 482, 484, and 486) may be configured to transfer heat to the solvent in the stripper by direct heat transfer (e.g., direct injection into the solvent), indirect heat transfer (e.g., via a heat exchanger), or any combination thereof. The controller 22 is configured to selectively control (e.g., open and close) the valves 480 to control the respective flows of heated fluid 168 (e.g., steam and / or heated water) through the steam circuits 460 (e.g., steam circuits 482. 484, and 486) to the stripper 454. In the illustrated embodiment, the steam circuits 482 and 486 are coupled to the intermediate portion 614 of the enclosure 602 at the steam injection locations 490 and 496, which are located between the stripper sections 628 and 630. However, the steam circuits 482 and 486 may be coupled to the stripper 454 at any suitable injection location, which may be the same or different between the steam circuits 482 and 486. For example, the steam injection locations 478 (e.g., 490 and 496) may be disposed directly at, radially inward from, and / or radially outward from one or more of the stripper sections 600. Additionally, the steam injection locations 478 (e.g., 490 and 496) may include steam distributors having a plurality of steam nozzles configured to distribute the heated fluid 168 (e.g., steam and / or heated water) across the interior volume 624 of the stripper 454.

[0052] In the illustrated embodiment, the stripper 612 may be coupled to or include one or more additional components, such as a thermal control system 638 anda moisture removal system 640. The thermal control system 638 may be coupled to any portion of the stripper 612, such as at the radially outer portion 612. The thermal control system 638 may include a solvent recirculation circuit 642 having a reboiler 644 configured to heat and boil the solvent for recirculation into the stripper 612. In the illustrated embodiment, the reboiler 644 is coupled to at least one of the steam circuits 460 (e.g., steam circuit 484) as a heat source for heating and boiling the solvent, rather than relying on an independent or separate heat source. However, in some embodiments, the reboiler 644 may include one or more additional heat sources, such as an electric heater, a combustor or furnace, a steam generator, or other heat sources, for heating the solvent. The additional heat sources may be used when steam is unavailable and / or insufficient to provide the desired heating in the reboiler 644.

[0053] However, in the illustrated embodiment, the steam circuits 460 may be the primary' source of heat to support the reboiler 644. For example, at least one of the steam circuits 460 (e.g., steam circuit 484) supplies the heated fluid 168 (e.g., steam and / or heated water) into the reboiler 644 at an inlet 646 (e.g., the steam injection location 500), while the reboiler 644 discharges water and / or steam at an outlet 648. The discharged water and / or steam flows through a return circuit 650 from the reboiler 644 to the HRSG 16, wherein the return circuit 650 may include a condenser 652 configured to condense any steam into water. In the illustrated embodiment, the return circuit 650 is coupled to the pump 124, which provides condensate back to the HRSG 16. Although the steam circuit 484 is coupled to the reboiler 644, any one or more of the steam circuits 460 (e.g., steam circuits 482, 484, and 486) may be coupled to the reboiler 644 to provide the heated fluid 168 (e.g.. steam and / or heated water) as a source of heat for heating and boiling the solvent in the stripper 454.

[0054] The moisture removal system 640 may include a condenser circuit 654 having a condenser 656, wherein the condenser circuit 654 is coupled to the gas outlet 608 and a return inlet 658. The condenser 656 is configured to cool and condense any steam and solvent vapor present in the captured gas 194 discharged from the stripper 454, thereby outputting water or condensate 660, the captured gas 194 substantially free of water content and solvent vapor, and solvent vapor for return to the stripper 454 via the return inlet 658. In some embodiments, the condenser 656 includes a heatexchanger (e.g., cooler) configured to transfer heat away from the captured gas 194. The moisture removal system 640 is coupled to the radially inner portion 610 of the enclosure 602. However, the moisture removal system 640 may be disposed at any suitable location to condense any steam and solvent vapor present in the captured gas 194. The captured gas 194 also may be compressed in the compression system 188 and routed to a storage and / or pipeline 228 as discussed above.

[0055] In operation, the controller 22 is configured to monitor the sensors 148 and control operation of the solvent-based gas capture system 450, using the heated fluid 168 (e.g., steam and / or heated water) supplied through the steam circuits 460 to support the stripper 454. For example, the controller 22 may selectively control the valves 480 to supply the heated fluid 168 (e.g., steam and / or heated water) through one or more of the steam circuits 460 depending on the conditions of the heated fluid 168 (e.g.. temperature, pressure, steam versus water content, etc.), the temperature of solvent in the stripper 454, the temperature of solvent in the reboiler 644, the operating conditions of the combined cycle system 10 (e.g., startup mode, steady state mode, shutdown mode, full load mode, and / or part load mode), the percentage of undesirable gases in the exhaust gas 62, the flow rate of the gas lean solvent 544, the flow rate of the gas rich solvent 562, the flow rate of the gas 542, or any combination thereof. During the startup, shutdown, and / or part load modes, if steam is unavailable or limited, then the controller 22 may be configured to control the one or more additional heat sources (e.g., electric heaters, furnaces, etc.) to provide heat to support the stripper 454. During the steady state mode, if steam is available, then the controller 22 may be configured to control the HRSG 16, the steam turbine system 14. and the valves 480 to provide the heated fluid 1 8 (e.g., steam and / or heated water) to the stripper 454. In certain embodiments, the controller 22 may be configured to control mixing of the heated fluid 168 (e.g., steam and / or heated water) from the various steam extraction locations 476, thereby providing a desired temperature and pressure of heated fluid 168 (e.g., steam and / or heated water) to support the stripper 454. However, the solvent-based gas capture system 450 may be configured to selectively use the heated fluid 168 (e.g., steam and / or heated water) in any manner from the HRSG 16 and the steam turbine system 14.

[0056] By further example, the controller 22 may selectively control the rotational speed of the absorber 452 about the rotational axis 451 and the stripper 454 about the rotational axis 453 to control (e.g., increase or decrease) the flow of solvent, and thus also control the absorption and desorption efficiency. In certain embodiments, the controller 22 may selectively control the rotational speed of the absorber 452 and the stripper 454 in combination with control of various valves, pumps, cooling systems, and heating systems of the solvent-based gas capture system 450. For example, the controller 22 may selectively control the rotational speed of the absorber 452 and the stripper 454 together (e.g., common rotational speed) or independent from one another (e.g., different rotational speeds) along with various other controls for the absorber 452 and the stripper 454. By further example, the controller 22 may selectively control the rotational speed of the absorber 452 and the stripper 454 in coordination with a rotational speed of the gas turbine system 12, the steam turbine system 14, a separate drive, the gearbox 119, or a combination thereof.

[0057] FIG. 3 is a schematic of an embodiment of the combined cycle system 10 of FIGS. 1 and 2, wherein rotation of the carbon capture system 100 is driven by rotation of the gas turbine system 12. As discussed above, the gas turbine system 12 receives air and / or recirculated exhaust gas 62 via the air intake 50. The combustors 54 then combust fuel from a fuel supply system with the compressed air and / or exhaust gas, and generate hot combustion gases. The hot combustion gases expand and drive one or more turbine stages (e.g., stages of rotating turbine blades) in the turbine 56, thereby driving rotation of the gas turbine shaft 64, which is coupled to the load 58. The turbine 56 then outputs the hot combustion gases as the exhaust gas 62.

[0058] In the illustrated embodiment, the gas turbine shaft 64 is further coupled to the carbon capture system 100. Specifically, an axis of rotation 700 extends from the turbine 56 and through the gearbox 119, the absorber 452, and the stripper 454. In certain embodiments, the gas turbine shaft 64 may extend the entire axis of rotation 700 to drive rotation of the gearbox 119, the absorber 452, and the stripper 454 via a single shaft. Alternatively, multiple shafts may be coupled to one another (e.g., via shaft couplings, end-to-end) to form two or more shaft segments along the axis of rotation 700. For example, the gas turbine shaft 64 may extend from the turbine 56 tothe gearbox 119, and the rotary shaft 118 of the carbon capture system 100 may extend from the gearbox 119 to the absorber 452 and the stripper 454. In any case, each of the gas turbine shaft 64, the absorber 452, and the stripper 454 are configured to rotate about the same axis of rotation 700, either on the same single rotating shaft (e.g., the gas turbine shaft 64) or on two or more rotating shafts (e.g., the gas turbine shaft 64 and the rotary shaft 118) coupled to one another. In certain embodiments, the gas turbine shaft 64, the absorber 452, and / or the stripper 454 may be configured to rotate about different axes of rotation, which may be parallel and / or crosswise to one another and coupled together via one or more gear assemblies or gearboxes.

[0059] As the turbine 56 rotates, the gas turbine system 12 discharges the exhaust gas 62 along a gas flow path 702 (e.g., gas circuit 456) toward the HRSG 16 which recovers waste heat from the exhaust gas 62 to generate steam for driving the steam turbine system 14. Subsequently, the exhaust gas 62 is discharged from the HRSG 16 and continues along the gas flow path 702 toward the carbon capture system 100 and. specifically, to the DCC 566 to be cooled. In some embodiments, the DCC 566 may be coupled to the rotary shaft 118 and configured to rotate about the axis of rotation 700. In this way, heat transfer between the exhaust gas 62 and the cooling fluid of the DCC 566 may be enhanced. Further, the exhaust gas 62 is directed to the absorber 452 to be cleaned by the gas lean solvent 544.

[0060] The absorber 452 receives a flow of the exhaust gas 62 via the gas flow path 702. as well as a flow of the gas lean solvent 544 via the solvent circuit 458. As the gas turbine system 12 discharges the exhaust gas 62, the turbine 56 spins the absorber 452 (e.g., via the rotary shaft 118) to apply a centrifugal force on the gas lean solvent 544 flowing therethrough. As a result, the gas lean solvent 544 flowing into the absorber 452 may flow radially outward from a central portion (e.g.. passage) of the absorber 452 through the packing. Meanwhile, the exhaust gas 62 is directed from the DCC 566 into the absorber 452 via the gas inlet 506, which may be located at an outer portion (e.g., along the circumference) of the absorber 452. The exhaust gas 62 may flow radially inward through the packing, contacting the gas lean solvent 544 flowing in the opposite direction. In other words, the rotation of the absorber 452 produces counter flow contact between the gas lean solvent 544 and the exhaust gas62. In this way, mass and / or heat transfer between the gas lean solvent 544 and the exhaust gas 62 may be enhanced. As a result, the gas lean solvent 544 absorbs undesirable gases (e.g., CO2, hydrocarbons, pollutants) from the exhaust gas 62 to become the gas rich solvent 562, which is discharged from the absorber 452.

[0061] Upon absorbing the undesirable gases, the gas rich solvent 562 is discharged (e.g., pumped) from the absorber 452 and directed to the heat exchanger 592 along the solvent circuit 458. The heat exchanger 592 is configured to place the gas rich solvent 562 exiting the absorber 452 in a heat exchange relationship with the gas lean solvent 544 exiting the stripper 454. Specifically, the gas rich solvent 562 may be used to cool the gas lean solvent 544 via the heat exchanger 592.

[0062] The gas rich solvent 562, now heated by the gas lean solvent 544 via the heat exchanger 592, is directed along the solvent circuit 458 to the stripper 454. Like the absorber 452, the stripper 454 is also configured to spin about the axis of rotation 700. For example, the absorber 452 and the stripper 452 may both be coupled to the same rotary shaft 118, which is coupled to and driven by the gas turbine system 12. That is, the rotation of the turbine 56 may directly drive the rotation of the stripper 454. In certain embodiments, each of the turbine 56. the absorber 452, and the stripper 454 may rotate about the same axis of rotation 700, driven by the same rotating shaft.

[0063] As the stripper 454 receives the gas rich solvent 562, the centrifugal action of the spinning stripper 454 causes the gas rich solvent 526 to distribute radially outward through the packing. At the same time, the stripper 454 receives a flow of steam via the steam circuits 460. The steam flows radially inward through the packing, producing counter current contact between the steam and the gas rich solvent 562. In this way, the steam strips the gas rich solvent 562 of the undesirable gases and carries the undesirable gases (e.g., carbon dioxide) out of the stripper 454 via the gas outlet 608.

[0064] As discussed above with respect to FIG. 2. the solvent circuit 458 includes the reboiler 644 configured to heat and / or boil the gas lean solvent 544 after theundesirable gases are stripped by the steam. The reheated gas lean solvent 544 may be recirculated through the stripper 454 to heat the gas rich solvent 562 flowing into the stripper to further strip the undesirable gases. Additionally or alternatively, the pump 594 may pump the gas lean solvent 544 along the solvent path 474 to the heat exchanger 592 and then to the absorber 452.

[0065] FIG. 4 is a schematic of an embodiment of the combined cycle system 10 of FIGS. 1 and 2, having an exhaust gas compressor system 720 disposed between the DCC 566 and the absorber 452. The exhaust gas compressor system 720 is configured to compress the exhaust gas 62 before flowing the exhaust gas 62 to the absorber 452. In this way, mass and / or heat transfer between the exhaust gas 62 and the gas lean solvent 544 may be enhanced due to the compressed exhaust gas 62. Indeed, by compressing the exhaust gas 62, the mass flow rate of the exhaust gas 62 contacting the gas lean solvent 544 may be increased, enabling greater rates of absorption and / or heat transfer between the gas lean solvent 544 and the exhaust gas 62. The exhaust gas compressor system 720 may include one or more compressor stages 722 arranged in series. For example, the exhaust gas compressor system 720 may compress the exhaust gas 62 at a first compressor stage, a second compressor stage, and a third compressor stage in sequence. Alternatively, the gas compressor system 720 may include a single compressor stage.

[0066] In certain embodiments, the gas compressor system 720 may be driven by the gas turbine system 12 to rotate along the axis of rotation 700 shared by the absorber 452 and the stripper 454. For example, the gas compressor system 720 may include a compressor shaft 724 coupled to the gas turbine shaft 64, the gearbox 119, and / or the rotary' shaft 118. In some embodiments, the compressor shaft 724 and the rotary shaft 118 may be the same shaft. In any case, rotation of the gas compressor system 720 may be driven by (e.g., coupled to) the rotation of the gas turbine system 12 and the carbon capture system 100. Further, one or more of the turbine 56, the gas compressor system 720, the absorber 452, and / or the stripper 454 may be aligned along the same axis of rotation 700. In this way, the design of the combined cycle system 10 may be made more compact than traditional systems. In some embodiments, the gas compressor system 720, the absorber 452, and / or the stripper454 may be driven to rotate by one or more shafts of the gas turbine system 12, the steam turbine system 14, one or more separate drives (e.g., electric or combustion engines), or a combination thereof. However, use of a common source of rotation for the gas compressor system 720, the absorber 452, and / or the stripper 454 may reduce costs and improve efficiency of the combined cycle system 10.

[0067] In certain embodiments, the carbon capture system 100 may include one or more additional heat exchangers 726 (e.g., intercoolers) configured to place the compressed exhaust gas 62 in heat exchange relationships with cooling fluids (e.g., coolant, water, refrigerant). The additional heat exchangers 726 may be disposed between the compressor stages 722, such that the exhaust gas 62 is cooled following each compression stage. For example, the exhaust gas 62 may flow from the DCC 566 in sequence to the first compressor stage 722, to a first additional heat exchanger 726 (e.g.. intercooler), to the second compressor stage 722, to a second additional heat exchanger 726 (e.g.. intercooler), to the third compressor stage 722. and to a third additional heat exchanger 726. The heat exchangers 726 are configured to improve the efficiency of compression between the compression stages, while also cooling the final compressed exhaust gas 62 prior to delivery to the absorber 452. The efficiency of absorption in the absorber 452 generally increases with higher compression (i.e., higher pressure) and lower temperature. In another embodiment, the additional heat exchangers may be integrated within compressors (e.g., compressor stages 722). Thus, the compression and cooling of the exhaust gas 62 may increase the absorption efficiency of the absorber 452 when absorbing undesirable gases (e.g., CO2) from the exhaust gas 62 into the solvent in the absorber 452. As a result, the exhaust gas 62 may arrive at the absorber 452 at a temperature and pressure suitable for efficient absorption by the gas lean solvent 544. In other aspects, the embodiment of FIG. 4 is generally similar to that of FIG. 3, wherein both the absorber 452 and the stripper 454 are rotated to increase the absorption and desorption efficiencies of the carbon capture system 100.

[0068] FIG. 5 is a schematic of an embodiment of the combined cycle system 10 having an auxiliary steam turbine 637 (instead of the gas turbine 56) rotationally coupled to the absorber 452 and the stripper 454. The auxiliary steam turbine 637may be coupled (e.g., fluidly coupled) to the steam turbine system 14 and / or the HRSG 16 and configured to receive (e.g., extract) steam from the steam circuits 460 (e.g., steam circuit 484). For example, a portion of the steam flowing along the steam flow path 492 between the IP steam turbine 84 and the LP steam turbine 86 may be extracted from the steam extraction location 494. The extracted steam may flow along the steam circuit 484 toward the reboiler 644 to heat the solvent in the stripper 454. A portion 740 of the steam may be directed to the auxiliary steam turbine 637 to drive the rotary shaft 118. A remaining portion 742 of the steam may be directed to the reboiler 644 to heat the solvent in the stripper 454.

[0069] The auxiliary steam turbine 637 is configured to drive the rotary shaft 118 to rotate the absorber 452 and the stripper 454. In certain embodiments, the auxiliary steam turbine 637, the absorber 452, and the stripper 454 are configured to rotate about the same axis of rotation 700. In this way, the combined cycle system 10 may harness steam energy from the HRSG 16 and the steam turbine system 14 to drive rotation of the carbon capture system 100. In certain embodiments, the gas turbine system 12, the steam turbine system 14, the auxiliary steam turbine 637, one or more separate drives (e.g., electric or combustion engines), or a combination thereof, are configured to jointly or independently drive rotation of the absorber 452, the stripper 454, the gas compressor system 720 of FIG. 4, or a combination thereof.

[0070] The various aspects of FIGS. 1-5 are intended for use in any combination with one another. In certain embodiments, the controller 22 is configured to monitor various aspects of the combined cycle system 10 and the carbon capture system 100 (e.g., absorber 452 and stripper 454), and then control the rotational speed of the gas compressor system 720, the absorber 452, and the stripper 454 to improve the absorption and desorption efficiencies. The controller 22 may monitor and control the temperatures, pressures, and flow rates of the exhaust gas, steam, and solvent in the carbon capture system 1 0 (e.g., absorber 452 and stripper 454) in combination with the rotation speed control. The controller 22 may control all aspects of the combined cycle system 10 and the carbon capture system 100 in response to changes in the operating mode (e.g., startup mode, steady state mode, part load operating mode, full load operating mode, or shutdown mode) of the gas turbine system 12, and thus therotational speed of the gas compressor system 720, the absorber 452, and / or the stripper 454 may vary depending on the operating mode. In certain embodiments, the controller 22 may be configured to increase the rotational speed of the gas compressor system 720, the absorber 452, and / or the stripper 454 in response to an increased flow of the exhaust gas 62, an increase in concentration of undesirable gases (e.g., CO2) in the exhaust gas 62, and / or other factors demanding an increased rate or efficiency of carbon capture. In this way, the rotational speed of the absorber 452 and the stripper 454 may be adjusted to control a capture rate of the undesirable gases. During part load operation of the gas turbine system 12, the controller 22 may control the rotational speed of the absorber 452 and the stripper 454 to operate at a partial capture rate based on the load of the gas turbine system 12. In certain embodiments, the controller 22 may be configured to decrease the rotational speed of the gas compressor system 720, the absorber 452, and / or the stripper 454 in response to a decreased flow of the exhaust gas 62, a decrease in concentration of undesirable gases (e.g., CO2) in the exhaust gas 62. and / or other factors demanding or allowing a decreased rate or efficiency of carbon capture.

[0071] Technical effects of the disclosed embodiments enable a turbine (e.g., a gas turbine and / or a steam turbine) of a combustion-driven power plant to drive a rotating carbon capture system. For example, the gas turbine may be rotationally coupled to an absorber and a stripper via a gearbox, such that rotation of the gas turbine drives rotation of the absorber and the stripper. The absorber, the stripper, and the gas turbine may be configured to rotate about a shared rotary shaft extending along an axis of rotation. In certain embodiments, the absorber and the stripper may instead be driven by an auxiliary steam turbine powered by steam extracted from a heat recovery steam generator system. The auxiliary steam turbine may be rotationally coupled to the absorber and the stripper directly or via a gearbox. Present embodiments enable efficient operation of the rotating carbon capture system by configuring the turbine (gas or steam) to drive rotation of the absorber and the stripper. Additionally, the size of the rotating carbon capture system may be reduced by driving rotation of the absorber and the stripper via a shared rotary shaft driven by the turbine.

[0072] The subject matter described in detail above may be defined by one or more clauses, as set forth below.

[0073] A system includes a turbine configured to rotate a rotary shaft about an axis of rotation. The system further includes a gas capture system having an absorber configured to absorb an undesirable gas from an exhaust gas into a solvent. The gas capture system also includes a stripper configured to strip the undesirable gas from the solvent. Additionally, the gas capture system includes a solvent circuit coupled to the absorber and the stripper. The solvent circuit is configured to circulate the solvent through the absorber and the stripper. Furthermore, the turbine is configured to rotate at least one of the absorber or the stripper.

[0074] The system of the preceding clause, wherein the turbine is configured to rotate both the absorber and the stripper.

[0075] The system of any preceding clause, wherein the turbine comprises a gas turbine, a steam turbine, or a combination thereof.

[0076] The system of any preceding clause, including a controller configured to control a speed of rotation of the absorber or the stripper based on one or more operational parameters of the gas capture system.

[0077] The system of any preceding clause, wherein the turbine is configured to rotate the absorber or the stripper at a speed of rotation sufficient to cause a centrifugal force to drive flow of the solvent in a radial outward direction.

[0078] The system of any preceding clause, including a heat recovery steam generator disposed along a gas flow path upstream of the absorber. The heat recovery steam generator is configured to receive the exhaust gas via the gas flow path, recover heat from the exhaust gas to generate steam, and supply the steam to a steam turbine system.

[0079] The system of any preceding clause, wherein the turbine is a gas turbine configured to combust fuel and discharge the exhaust gas along the gas flow path toward the heat recovery steam generator.

[0080] The system of any preceding clause, wherein the gas capture system includes a direct contact cooler disposed along the gas flow path between the heat recovery steam generator and the absorber. The direct contact cooler is configured to receive the exhaust gas from the heat recovery steam generator. Additionally, the direct contact cooler is configured to cool the exhaust gas via a heat exchange relationship with a cooling fluid.

[0081] The system of any preceding clause, including an exhaust gas compressor system disposed along the gas flow path between the direct contact cooler and the absorber. The exhaust gas compressor system is configured to compress the exhaust gas.

[0082] The system of any preceding clause, wherein the exhaust gas compressor system includes at least one compressor shaft rotationally coupled to the rotary shaft.

[0083] The system of any preceding clause, wherein the turbine is an auxiliary steam turbine configured to receive a flow of steam from the heat recovery steam generator.

[0084] The system of any preceding clause, wherein the auxiliary steam turbine is coaxially aligned with the absorber and the stripper along the axis of rotation.

[0085] The system of any preceding clause, including a steam circuit configured to circulate steam through the heat recovery steam generator, the steam turbine system, the auxiliary steam turbine, and a reboiler of the gas capture system. The reboiler is configured to heat the solvent flowing through the stripper. The steam circuit is configured to direct the flow of steam from the heat recovery steam generator to the auxiliary steam turbine. The steam circuit is configured to direct an additional flow of steam from the heat recovery steam generator to the reboiler.

[0086] The system of any preceding clause, wherein the turbine includes a turbine shaft, and the gas capture system includes a gearbox configured to transmit torque from the turbine shaft to the rotary shaft.

[0087] The system of any preceding clause, wherein the absorber is configured to direct the solvent radially outward from a central portion of the absorber through a packing.

[0088] A gas capture system includes at least one of an absorber or a stripper of the gas capture system. The absorber is configured to absorb an undesirable gas from an exhaust gas into a solvent, and the stripper is configured to strip the undesirable gas from the solvent. The gas capture system further includes a rotary shaft coupled to the at least one of the absorber or the stripper. The rotary shaft is configured to be driven by a turbine to rotate the at least one of the absorber or the stripper.

[0089] The gas capture system of the preceding clause, wherein the rotary shaft includes one or more rotary shafts coupled to the absorber and the stripper. The turbine comprises one or more turbines.

[0090] The gas capture system of any preceding clause, wherein the rotary shaft is configured to be driven by the turbine to rotate the at least one of the absorber or the stripper at a speed of rotation sufficient to cause a centrifugal force to drive flow of the solvent in a radial outward direction.

[0091] A combustion-driven power plant includes a gas turbine configured to drive a shaft. Additionally, the combustion-driven power plant includes a rotating carbon capture system configured to remove carbon dioxide from an exhaust gas of the gas turbine, wherein the rotating carbon capture system is coupled to and configured to rotate about the shaft.

[0092] The combustion-driven power plant of the preceding clause, wherein the rotating carbon capture system includes an absorber and a stripper configured to rotate about the shaft.

[0093] This written description uses examples to disclose the subject matter, including the best mode, and also to enable any person skilled in the art to practice the subject matter, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the subject matter is defined bythe claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.

Claims

CLAIMS:

1. A system, comprising: a turbine configured to rotate a rotary shaft about an axis of rotation; and a gas capture system, comprising: an absorber configured to absorb an undesirable gas from an exhaust gas into a solvent; a stripper configured to strip the undesirable gas from the solvent; and a solvent circuit coupled to the absorber and the stripper, wherein the solvent circuit is configured to circulate the solvent through the absorber and the stripper, wherein the turbine is configured to rotate at least one of the absorber or the stripper.

2. The system of claim 1, wherein the turbine is configured to rotate both the absorber and the stripper.

3. The system of claim 1, wherein the turbine comprises a gas turbine, a steam turbine, or a combination thereof.

4. The system of claim 1, comprising a controller configured to control a speed of rotation of the absorber or the stripper based on one or more operational parameters of the gas capture system.

5. The system of claim 1. wherein the turbine is configured to rotate the absorber or the stripper at a speed of rotation sufficient to cause a centrifugal force to drive flow of the solvent in a radial outward direction.

6. The system of claim 1, comprising a heat recovery steam generator disposed along a gas flow path upstream of the absorber, wherein the heat recover}' steam generator is configured to: receive the exhaust gas via the gas flow path; recover heat from the exhaust gas to generate steam: andsupply the steam to a steam turbine system.

7. The system of claim 6, wherein the turbine is a gas turbine configured to combust fuel and discharge the exhaust gas along the gas flow path toward the heat recovery steam generator.

8. The system of claim 7, wherein the gas capture system comprises a direct contact cooler disposed along the gas flow path between the heat recovery steam generator and the absorber, wherein the direct contact cooler is configured to: receive the exhaust gas from the heat recovery steam generator; and cool the exhaust gas via a heat exchange relationship with a cooling fluid.

9. The system of claim 8, comprising an exhaust gas compressor system disposed along the gas flow path between the direct contact cooler and the absorber, wherein the exhaust gas compressor system is configured to compress the exhaust gas.

10. The system of claim 9, wherein the exhaust gas compressor system comprises: at least one compressor shaft rotationally coupled to the rotary shaft; at least two compressor stages configured to rotate about the at least one compressor shaft; and at least one intercooler disposed between the at least two compressor stages.

11. The system of claim 6. wherein the turbine is an auxiliary steam turbine configured to receive a flow of steam from the heat recovery steam generator.

12. The system of claim 11, wherein the auxiliary’ steam turbine is coaxially aligned with the absorber and the stripper along the axis of rotation.

13. The system of claim 11, comprising a steam circuit configured to circulate steam through the heat recovery' steam generator, the steam turbine system, the auxiliary' steam turbine, and a reboiler of the gas capture system, wherein: the reboiler is configured to heat the solvent flowing through the stripper;the steam circuit is configured to direct the flow of steam from the heat recovery steam generator to the auxiliary steam turbine; and the steam circuit is configured to direct an additional flow of steam from the heat recovery' steam generator to the reboiler.

14. The system of claim 1, wherein the turbine comprises a turbine shaft, and the gas capture system comprises a gearbox configured to transmit torque from the turbine shaft to the rotary' shaft.

15. The system of claim 1, wherein the absorber is configured to direct the solvent radially outward from a central portion of the absorber through a packing.

16. A gas capture system, comprising: at least one of an absorber or a stripper of the gas capture system, wherein the absorber is configured to absorb an undesirable gas from an exhaust gas into a solvent, and the stripper is configured to strip the undesirable gas from the solvent; and a rotary' shaft coupled to the at least one of the absorber or the stripper, wherein the rotary shaft is configured to be driven by a turbine to rotate the at least one of the absorber or the stripper.

17. The system of claim 16, wherein the rotary' shaft comprises one or more rotary' shafts coupled to the absorber and the stripper, wherein the turbine comprises one or more turbines.

18. The system of claim 16, wherein the rotary shaft is configured to be driven by the turbine to rotate the at least one of the absorber or the stripper at a speed of rotation sufficient to cause a centrifugal force to drive flow' of the solvent in a radial outward direction.

19. A combustion-driven power plant, comprising: a gas turbine configured to drive a shaft; anda rotating carbon capture system configured to remove carbon dioxide from an exhaust gas of the gas turbine, wherein the rotating carbon capture system is coupled to and configured to rotate about the shaft.

20. The combustion-driven power plant of claim 19, wherein the rotating carbon capture system comprises an absorber and a stripper configured to rotate about the shaft.

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