Power plant with exhaust gas recirculation compressor

Abstract

The power plant includes a gas turbine engine including a compressor and a turbine. The compressor includes a compressor outlet. The turbine discharges a first exhaust gas stream. A heat recovery steam generator extracts heat from the first exhaust gas stream and discharges a second exhaust gas stream. A cooling device cools the second exhaust gas stream to provide a cooled exhaust gas stream and discharges the cooled exhaust gas stream. An exhaust gas recirculation line directs a first portion of the cooled exhaust gas stream to the compressor. The recirculation compressor selectively compresses the first portion of the cooled exhaust gas stream and discharges it at the compressor outlet.

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE This disclosure relates generally to power generation systems, and more specifically to systems that use recirculated exhaust gas and an exhaust gas recirculation compressor to increase plant output.

[0002] At least some known power plants generate energy through the combustion of carbon- and hydrogen-containing fuels, such as coal, oil, peat, waste, biofuels, natural gas, etc. In addition to carbon and hydrogen, such fuels may contain oxygen, moisture, and pollutants. As such, burning such fuels can produce gas streams that contain pollutants in the form of ash, carbon dioxide (CO), sulfur compounds (in the form of sulfur oxides called "SOx"), nitrogen compounds (in the form of nitrogen oxides called "NOx"), chlorine, mercury, and / or trace elements.

[0003] To aid in the removal of pollutants from gas streams, at least some known power plants use capture systems that attempt to capture pollutants before the exhaust stream is released into the atmosphere. For example, some known power plants use carbon capture systems that capture carbon dioxide (CO) after combustion and store it underground in an attempt to reduce the amount of CO released into the atmosphere. However, because the carbon capture process requires electricity, the carbon capture process can reduce the overall efficiency of the power plant and / or limit the amount of electricity the power plant can produce. As a result, at least some such power plant systems operate at reduced electrical efficiency. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] US Patent Application Publication No. 2009 / 0145127A1 Summary of the Invention

[0005] In one aspect, a power plant is provided that includes a gas turbine engine including a compressor and a turbine. The compressor includes a compressor outlet. The turbine discharges a first exhaust gas stream. A heat recovery steam generator extracts heat from the first exhaust gas stream and discharges a second exhaust gas stream. A cooling device cools the second exhaust gas stream to provide a cooled exhaust gas stream and discharges the cooled exhaust gas stream. An exhaust gas recirculation line directs a first portion of the cooled exhaust gas stream to the compressor. A recirculation compressor selectively compresses the first portion of the cooled exhaust gas stream and discharges it at the compressor outlet.

[0006] In another aspect, a power plant is provided that includes a gas turbine engine including a compressor and a turbine. The compressor includes a compressor outlet. The turbine outputs a first exhaust gas stream. A heat recovery steam generator extracts heat from the first exhaust gas stream and outputs a second exhaust gas stream and a steam stream. A cooling device cools the second exhaust gas stream to provide a cooled exhaust gas stream and outputs the cooled exhaust gas stream. An exhaust gas recirculation line directs a first portion of the cooled exhaust gas stream to the compressor. A recirculation compressor selectively compresses the first portion of the cooled exhaust gas stream and discharges it at the compressor outlet. A steam turbine receives the first flow portion of the steam stream and outputs a first extraction stream. A carbon capture system receives the first extraction stream and a second portion of the cooled exhaust gas stream.

[0007] In yet another aspect, a power plant is provided that includes a gas turbine engine including a compressor and a turbine. The compressor includes a compressor outlet. The turbine outputs a first exhaust gas stream. A heat recovery steam generator extracts heat from the first exhaust gas stream and outputs a second exhaust gas stream and a steam stream. A cooling device cools the second exhaust gas stream to provide a cooled exhaust gas stream and outputs the cooled exhaust gas stream. An exhaust gas recirculation line directs a first portion of the cooled exhaust gas stream to the compressor. A recycle compressor selectively compresses the first portion of the cooled exhaust gas stream and discharges it at the compressor outlet. A steam turbine receives a first flow portion of the steam stream and outputs a first extraction stream. A non-condensing steam turbine receives a second flow portion of the steam stream, powers the recycle compressor, and outputs a second extraction stream. A carbon capture system receives the first extraction stream, the second portion of the cooled exhaust gas stream, and the second extraction stream. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an exemplary power plant including an exhaust gas recycle compressor. [Figure 2] 1 is a schematic diagram of an exemplary power plant including an exhaust gas recycle compressor and a non-condensing steam turbine for powering the exhaust gas recycle compressor; [Figure 3] 1 is a schematic diagram of an alternative power plant including an exhaust gas recycle compressor and a motor powering the exhaust gas recycle compressor; DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE INVENTION The embodiments described herein relate to a power generation system that uses recirculated exhaust gas and an exhaust gas recirculation compressor to increase plant output.

[0010] Unless otherwise stated, approximation language such as "generally," "substantially," and "about" used herein indicates that the modified term may apply only to an approximate degree, as recognized by a person of ordinary skill in the art, rather than to an absolute or complete degree. Thus, values modified with terms such as "about," "approximately," and "substantially" are not limited to their exact numerical values. In at least some instances, approximation corresponds to the precision of the instrument measuring the value. In some cases, approximation corresponds to the precision of the instrument measuring the value. Furthermore, unless otherwise stated, terms such as "first," "second," and the like are merely index terms in this application and do not impose numerical, positional, or hierarchical requirements on the entity to which they are attached. Furthermore, a reference to, for example, "second" does not require or exclude the presence of, for example, a "first" or less, or a "third" or more.

[0011] FIG. 1 is a schematic illustration of an exemplary power plant 100. In the exemplary embodiment, the power plant 100 includes a gas turbine assembly 102 and a steam turbine 104. The gas turbine assembly 102 includes, in flow order, a compressor 106, a combustor 108, and a turbine 110. During operation, the combustor 108 receives air from the compressor 106 and fuel from a fuel supply and mixes the fuel and air to create a fuel-air mixture that is combusted to generate combustion gases. The combustion gases flow through the turbine 110 and are discharged from the turbine 110 as a first exhaust gas stream 112. In the exemplary embodiment, the power plant 100 also includes a steam cycle arrangement that includes a heat recovery steam generator (HRSG) 114 and the steam turbine 104. In some embodiments, the steam cycle arrangement may include other components, including a condenser 116 and one or more condensate pumps 117.

[0012] In the exemplary embodiment, HRSG 114 includes an inlet 118 that receives a first exhaust gas stream 112 from gas turbine assembly 102. Heat is extracted from first exhaust gas stream 112, and a second exhaust gas stream 120 is discharged through a first outlet 122. The second exhaust gas path 120 has a lower temperature than the temperature of first exhaust gas stream 112 entering inlet 118. HRSG 114 also includes a second outlet 124 that discharges a steam stream 126. Steam turbine 104 receives steam stream 126 and then discharges a first extraction stream 128. Steam not extracted in first extraction stream 128 continues to expand and condense in condenser 116. In some embodiments, steam turbine 104 may include an additional steam inlet from HRSG 114. In the exemplary embodiment, gas turbine assembly 102 and steam turbine 104 are both coupled to an electric generator 132 that utilizes the working fluid flowing therethrough to generate electrical power. Alternatively, turbine assembly 102 and steam turbine 104 are on separate shafts and are each coupled to a separate generator.

[0013] In the exemplary embodiment, power plant 100 also includes a carbon capture system 134. During operation, carbon capture system 134 produces a carbon dioxide stream 138. Carbon capture system 134 may include one or more separators, which may be used alone or in conjunction with other separation processes, such as, for example, carbon dioxide selective membrane technology, absorption processes, diaphragms, etc. An exhaust stream or decarbonized exhaust stream 140 may be discharged from carbon capture system 134 to the ambient environment. Exhaust stream 140 may be further processed before being discharged to the environment or otherwise. At least a portion of carbon dioxide stream 138 may be increased to supercritical pressure, for example, for transportation and / or storage.

[0014] The carbon capture system 134 generally includes an absorber 142, a stripper 144, and a reboiler 146. During operation, the second exhaust gas stream 120 discharged from the HRSG 114 is directed to the absorber 142. The exhaust gas may be pre-treated to remove particulates and impurities, such as SOx and NOx, before entering the absorber 142. Additionally, in the exemplary embodiment, a first cooler 148 is coupled between the HRSG 114 and the carbon capture system 134. Alternatively, the carbon capture system 134 may include one or more booster blowers (not shown) for pressurizing the flow toward the carbon capture system 134. The first cooler 148 may be, but is not limited to, a quench tower. The first cooler 148 cools the portion of the second exhaust gas stream 120 that is directed toward the carbon capture system 134.

[0015] A carbon dioxide-rich solvent 152 exits the absorber 142 and is then sent to the stripper 144 via pump 154. A carbon dioxide-lean solvent 156 exits the stripper 144 and is returned to the top of the absorber 142 via a reboiler 146, a pump 166, and a heat exchanger 158. The absorber 142 may be of any typical configuration for providing gas-liquid contact and absorption. The absorber 142 and stripper 144 may incorporate various internal components, such as trays, packing, and / or supports. In one embodiment, the absorber 142 absorbs carbon dioxide via countercurrent flow from the exhaust gas entering the absorber 142. The stripper 144 removes carbon dioxide from the solvent 152. The absorber 142 and stripper 144 may be sized based on the amount of carbon dioxide to be removed and may be sized according to various engineering design equations. Additionally, a single stripper 144 may be used in conjunction with multiple absorbers 142.

[0016] In the exemplary embodiment, the solvent 152 is preheated against the solvent 156 in a countercurrent heat exchanger 158 and then directed to the stripper 144. The stripper 144 is a pressurized unit that recovers carbon dioxide from the solvent 152. The stripper 144 typically incorporates a reboiler 146 that receives a portion of the solvent 156 exiting the stripper 144. The reboiler 146 vaporizes the solvent 156 and returns the solvent vapor 160 to the stripper 144 to facilitate increased carbon dioxide removal. A single stripper 144 may be coupled to multiple reboilers 146. The reboiler 146 receives steam, such as steam from the steam turbine 104 via the first extraction stream 128, to provide heating duty to the reboiler 146.

[0017] Vapor 162 exiting stripper 144 is partially condensed in condenser 136. The condensed portion of vapor 162 is returned to stripper 144 as reflux stream 164. Reflux stream 164 may be transferred through an accumulator (not shown) and a pump (not shown) before entering stripper 144. Carbon dioxide stream 138 is removed from condenser 136 after compression for transport and / or storage.

[0018] In the exemplary embodiment, power plant 100 utilizes exhaust gas recirculation through post-combustion carbon capture system 134. An exhaust gas recirculation stream 190 is drawn downstream from first cooling device 148 and directed toward compressor 106. Compressor 106 includes a compressor inlet 168 and a compressor outlet 170. First cooling device 148 may be, but is not limited to, a quench tower. A recirculation compressor 192 is coupled between cooling device 148 and compressor 106. Recirculation compressor 192 receives exhaust gas recirculation stream 190 and discharges a compressed exhaust stream 194 toward compressor 106. Compressor 106 receives compressed exhaust stream 194 at compressor outlet 170. More specifically, the compressed exhaust stream 194 is directed towards the compressor outlet 170 to increase the power generated by the gas turbine assembly 102 and improve the efficiency of the gas turbine assembly 102, thereby improving the performance of the power plant 100. Additionally, the compressed exhaust stream 194 is directed towards the compressor outlet 170 to facilitate improving the performance of the carbon capture system 134 by increasing the carbon dioxide concentration in the first exhaust gas stream 112 exiting the turbine 110, thereby improving the performance of the power plant 100.

[0019] The example power plant 100 may include a controller 176 that is used to dynamically adjust the operation of the power plant 100. For example, the controller 176 may monitor and / or control the operation of the recycle compressor 192. Accordingly, in one embodiment, the flow of the exhaust gas recirculation stream 190 is adjusted by the controller 176 to facilitate improving the power output of the power plant 100. That is, the controller 176 may selectively adjust the flow of the exhaust gas recirculation stream 190 drawn downstream from the first cooling device 148, as described herein, to facilitate improving the power output of the power plant 100. The controller 176 may also facilitate extending the useful life of components within the power plant 100. Thus, flow adjustments provide options available to operators of the power plant 100 when determining how to optimize the performance and life consumption of the gas turbine 102.

[0020] FIG. 2 is a schematic illustration of an exemplary power plant 200. The embodiment illustrated in FIG. 2 is similar to the embodiment illustrated in FIG. 1, with the following differences, and the same reference numerals used in FIG. 1 are used in FIG. 2. In FIG. 2, the power plant 200 utilizes exhaust gas recirculation via a post-combustion carbon capture system 134. An exhaust gas recirculation stream 190 is drawn downstream from the first cooling device 148 and directed toward the compressor 106. The compressor 106 includes a compressor inlet 168 and a compressor outlet 170. The first cooling device 148 may be, but is not limited to, a quench tower. A recycle compressor 192 is coupled between the cooling device 148 and the compressor 106. The recycle compressor 192 receives the exhaust gas recirculation stream 190 and discharges a compressed exhaust stream 194 toward the compressor 106. The compressor 106 receives the compressed exhaust stream 194 at the compressor outlet 170. The exemplary power plant 200 utilizes a non-condensing steam turbine 202 to power the recycle compressor 192 to reduce adverse effects on the output and / or efficiency of the power plant 100 from powering the recycle compressor 192. The non-condensing steam turbine 202 may be coupled to the recycle compressor 192 by a gearbox 204, as shown in FIG. 2. In some embodiments, the non-condensing steam turbine 202 may be directly connected to the recycle compressor 192 by a shaft.

[0021] In the exemplary embodiment, non-condensing steam turbine 202 includes a non-condensing steam turbine inlet 206 and a non-condensing steam turbine exhaust outlet 208. HRSG 114 discharges steam flow 126 through second outlet 124. Steam flow 126 includes a first flow portion 210 that is directed toward steam turbine 104 and a second flow portion 212 that is directed toward non-condensing steam turbine 202. Non-condensing steam turbine 202 receives second flow portion 212 through non-condensing steam turbine inlet 206 and then discharges a second extracted flow 214 through non-condensing steam turbine exhaust outlet 208. Reboiler 146 of carbon capture system 134 receives steam, such as steam from steam turbine 104 via first extracted flow 128 and from non-condensing steam turbine 202 via second extracted flow 214, to provide a heating duty to reboiler 146.

[0022] The example power plant 200 may include a controller 176 that is used to dynamically adjust the operation of the power plant 200. For example, the controller 176 may monitor and / or control the operation of the recycle compressor 192 and the non-condensing steam turbine 202 and may also determine steam cycle losses resulting from, for example, exhausting the second extract stream 214 and the first extract stream 128 to the carbon capture system 134. In some embodiments, an optimal balance may be achieved between the second extract stream 214 exhausting the recondensing steam turbine 202 and the load on the recycle compressor 192 that supplies the first extract stream 128 exhausting the steam turbine 104 to the reboiler 146.

[0023] Controller 176 can also dynamically determine power consumption and steam cycle losses and adjust operation of power plant 200 accordingly. In one embodiment, the operation of recycle compressor 192 and non-condensing steam turbine 202 is variably adjusted by controller 176 to facilitate improved plant output. That is, controller 176 can adjust the flow of exhaust gas recycle stream 190 to direct second extraction stream 214 to carbon capture system 134 to improve power plant 200 output. Controller 176 can also facilitate extending the useful life of components within power plant 200. Thus, flow modulation provides options for operators of power plant 200 to use in determining how to optimize the performance and life consumption of plant equipment.

[0024] FIG. 3 is a schematic illustration of an alternative power plant 300. The embodiment shown in FIG. 3 is similar to the embodiment shown in FIGS. 1 and 2, with the following differences, and the same reference numerals used in FIGS. 1 and 2 are used in FIG. 3. In FIG. 3, the power plant 300 utilizes exhaust gas recirculation with a post-combustion carbon capture system 134. An exhaust gas recirculation stream 190 is drawn downstream from the first cooling device 148 and directed toward the compressor 106. The compressor 106 has a compressor inlet 168 and a compressor outlet 170. The first cooling device 148 may be, but is not limited to, a quench tower. A recycle compressor 192 is coupled between the cooling device 148 and the compressor 106. The recycle compressor 192 receives the exhaust gas recirculation stream 190 and discharges a compressed exhaust stream 194 toward the compressor 106. The compressor 106 receives the compressed exhaust stream 194 at the compressor outlet 170. The power plant 300 utilizes a motor 302 to power the recycle compressor 192. The recycle compressor 192 is coupled to the motor 302, which provides the necessary drive power for the recycle compressor 192.

[0025] The power plant 300 may include a controller 176 that is used to dynamically adjust the operation of the power plant 300. For example, the controller 176 may monitor and / or control the operation of the recycle compressor 192. In one embodiment, the operation of the recycle compressor 192 is variably adjusted by the controller 176 to help improve the plant output. That is, the controller 176 may adjust the flow of the exhaust gas recycle stream 190 to improve the output of the power plant 300.

[0026] The foregoing description is intended to be illustrative only, and those skilled in the art will recognize that changes can be made to the described embodiments without departing from the scope of the disclosed invention. Modifications within the scope of the invention will be apparent to those skilled in the art in light of the present disclosure, and such modifications fall within the scope of the appended claims.

[0027] Although specific features of various embodiments of the invention may be shown in some drawings and not in others, this is for convenience only. Moreover, references to "one embodiment" in the above description are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. In accordance with the principles of the presently disclosed technology, features shown in one drawing may be referenced and / or claimed in combination with features shown in other drawings.

[0028] Additional aspects of the present invention are presented in the following embodiments section. [Embodiment Item 1] 1. A power plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and to discharge a second exhaust gas stream; a cooling device configured to cool the second exhaust gas stream to produce a cooled exhaust gas stream and to discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas stream towards the compressor; and a recirculation compressor configured to selectively compress the first cooled flow portion of the cooled exhaust gas stream for discharge at the compressor outlet. [Embodiment 2] The power plant of embodiment 1 further comprises: a heat recovery steam generator configured to discharge a steam flow; a steam turbine configured to receive a first flow portion of the steam flow and discharge a first extraction flow; a carbon capture system configured to receive the first extraction flow; and a controller configured to adjust the flow of the first cooled flow portion of the cooled exhaust gas flow that is recirculated toward the compressor to help improve the power plant's output and / or efficiency. [Embodiment 3] The power plant of embodiment 2 further comprises a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extraction stream; and the carbon capture system configured to receive the second extraction stream. [Embodiment 4] The power plant of embodiment 3, further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream. [Embodiment 5] The power plant of embodiment 2, further comprising a carbon capture system configured to receive the second cooled flow portion of the cooled exhaust gas flow. [Embodiment 6] The power plant of embodiment 2, further comprising a motor configured to power the recycle compressor. [Embodiment 7] The power plant of embodiment 3, wherein the controller is further configured to determine a performance of the power plant obtained by discharging the first and second extracted streams to the carbon capture system, and to adjust the flow of the first cooled stream portion of the cooled exhaust gas stream that is recirculated toward the compressor to facilitate improving the power plant's output and / or efficiency. [Embodiment 8] 1. A power plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and discharge a second exhaust gas stream and a steam stream; a cooling device configured to cool the second exhaust gas stream to result in a cooled exhaust gas stream and discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas stream towards the compressor; a recirculation compressor configured to selectively compress the first cooled flow portion of the cooled exhaust gas stream for discharge at the compressor outlet; a steam turbine configured to receive the first flow portion of the steam stream and discharge a first extracted flow; and a carbon capture system configured to receive the first extracted flow and the second cooled flow portion of the cooled exhaust gas stream. [Embodiment Item 9] The power plant of embodiment 8, further comprising a controller configured to adjust the flow of the first cooled flow portion of the cooled exhaust gas flow recirculated towards the compressor to facilitate improving the power plant's output and / or efficiency. [Embodiment Item 10] The power plant of embodiment 9 further comprises a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extraction stream; and the carbon capture system configured to receive the second extraction stream. [Embodiment Item 11] 11. The power plant of embodiment 10, further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream. [Embodiment Item 12] The power plant of embodiment 8, further comprising a motor configured to power the recycle compressor. [Embodiment Item 13] The power plant of embodiment 10, wherein the controller is further configured to determine power consumption resulting from discharging the first extraction stream and the second extraction stream to the carbon capture system, and to adjust the flow of the first cooled stream portion of the cooled exhaust gas stream that is recirculated toward the compressor to help improve the power plant's output and / or efficiency. [Embodiment Item 14] 1. A power plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and discharge a second exhaust gas stream and a steam stream; a cooling device configured to cool the second exhaust gas stream to result in a cooled exhaust gas stream and discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas stream towards the compressor; a recycle compressor configured to selectively compress the first cooled flow portion of the cooled exhaust gas stream for discharge at the compressor outlet; a steam turbine configured to receive a first flow portion of the steam stream and discharge a first extracted flow stream; a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extracted flow stream; and a carbon capture system configured to receive the first extracted flow, the second extracted flow, and the second portion of the cooled exhaust gas stream. [Embodiment Item 15] 15. The power plant of embodiment 14, further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream.

[0029] While the invention has been described in terms of various specific embodiments, it will be apparent to those skilled in the art that the invention can be practiced with various modifications within the spirit and scope of the appended claims. [Explanation of symbols]

[0030] 100 Power Plants 102 Gas Turbine Assembly 104 Steam Turbine 106 Compressor 108 Combustor 110 Turbine 112 first exhaust gas stream 114 Waste heat recovery boiler 134 Carbon Capture System 148 Cooling device 190 Exhaust gas recirculation flow 192 Recirculation Compressor

Claims

1. A power generation plant, the power generation plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and to discharge a second exhaust gas stream; a cooling device configured to cool the second exhaust gas stream to provide a cooled exhaust gas stream and to discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas flow toward the compressor; a recycle compressor configured to selectively compress a first cooled flow portion of the cooled exhaust gas stream for discharge to a compressor outlet; A power generation plant comprising:

2. the heat recovery steam generator configured to discharge a steam stream; a steam turbine configured to receive a first flow portion of the steam flow and to discharge a first extraction flow; a carbon capture system configured to receive the first extraction stream; a controller configured to adjust the flow of a first cooled flow portion of the cooled exhaust gas flow recirculated toward the compressor to facilitate increasing the power output and / or efficiency of the power plant; The power plant of claim 1 further comprising:

3. a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extraction stream; the carbon capture system configured to receive a second extraction stream; The power plant of claim 2 further comprising:

4. The power plant of claim 3 , further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream.

5. The power plant of claim 2 , further comprising the carbon capture system configured to receive a second cooled flow portion of the cooled exhaust gas flow.

6. The power plant of claim 2 , further comprising a motor configured to power the recycle compressor.

7. 4. The power plant of claim 3, wherein the controller is further configured to determine a performance of the power plant obtained by discharging the first extracted stream and the second extracted stream to the carbon capture system, and to adjust the flow of the first cooled stream portion of the cooled exhaust gas stream that is recirculated toward the compressor to help increase the power plant output and / or efficiency.

8. A power generation plant, the power generation plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and to discharge a second exhaust gas stream and a steam stream; a cooling device configured to cool the second exhaust gas stream to provide a cooled exhaust gas stream and to discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas flow toward the compressor; a recycle compressor configured to selectively compress a first cooled flow portion of the cooled exhaust gas stream for discharge to a compressor outlet; a steam turbine configured to receive a first flow portion of the steam flow and to discharge a first extracted flow; a carbon capture system configured to receive the first extracted stream and the second cooled stream portion of the cooled exhaust gas stream; A power generation plant comprising:

9. 10. The power plant of claim 8, further comprising a controller configured to adjust the flow of the first cooled flow portion of the cooled exhaust gas flow recirculated toward the compressor to help increase the power output and / or efficiency of the power plant.

10. a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extraction stream; the carbon capture system configured to receive a second extraction stream. The power plant of claim 9 further comprising:

11. The power plant of claim 10 , further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream.

12. The power plant of claim 8 , further comprising a motor configured to power the recycle compressor.

13. 11. The power plant of claim 10, wherein the controller is further configured to determine a power consumption resulting from discharging the first extracted stream and the second extracted stream to the carbon capture system, and to adjust a flow of the first cooled stream portion of the cooled exhaust gas stream that is recirculated toward the compressor to help increase an output and / or efficiency of the power plant.

14. A power generation plant, the power generation plant comprising: a gas turbine engine including a compressor having a compressor outlet and a turbine configured to discharge a first exhaust gas stream; a heat recovery steam generator configured to extract heat from the first exhaust gas stream and to discharge a second exhaust gas stream and a steam stream; a cooling device configured to cool the second exhaust gas stream to provide a cooled exhaust gas stream and to discharge the cooled exhaust gas stream; an exhaust gas recirculation line configured to direct a first cooled flow portion of the cooled exhaust gas flow toward the compressor; a recycle compressor configured to selectively compress a first cooled flow portion of the cooled exhaust gas stream for discharge to a compressor outlet; a steam turbine configured to receive a first flow portion of the steam flow and to discharge a first extracted flow; a non-condensing steam turbine configured to receive a second flow portion of the steam stream, power the recycle compressor, and discharge a second extraction stream; a carbon capture system configured to receive the first extract stream, the second extract stream, and a second portion of the cooled exhaust gas stream; A power generation plant comprising:

15. The power plant of claim 14 , further comprising the carbon capture system comprising a reboiler configured to receive the first extract stream and the second extract stream.

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