System and method for bypassing a carbon capture system of a gas turbine engine

Abstract

The system includes a bypass system having a first valve, a first driver coupled to the first valve, and a controller coupled to the first driver. The controller is configured to operate the first driver to move the first valve between a first position and a second position. The first position of the first valve opens a gas processing flow path for exhaust gas flow from the gas turbine engine and closes a bypass flow path. The second position of the first valve closes the gas processing flow path and opens the bypass flow path for exhaust gas flow from the gas turbine engine. The gas processing flow path is configured to extend through a gas processing system having a gas capture system. The bypass flow path is configured to bypass the gas processing system having the gas capture system.

Description

[Technical Field]

[0001] TECHNICAL FIELD This application relates generally to systems and methods for treating gases, such as exhaust gases. [Background technology]

[0002] Industrial plants, such as power plants, can produce a variety of gases, for example, exhaust gases from combustion systems. Combustion systems can include gas turbine engines, reciprocating piston-cylinder engines, furnaces, boilers, or other industrial equipment. These exhaust gases can include one or more undesirable gases, for example, acid gases and / or greenhouse gases. For example, undesirable gases can include carbon oxides (CO), such as carbon dioxide (CO) and carbon monoxide (CO). X ), nitrogen oxides such as nitrogen dioxide (NO2) X ), and / or sulfur oxides (SO ), such as sulfur dioxide (SO ). X ). CO2 is both an acid gas and a greenhouse gas. Unfortunately, various conditions in industrial plants, including start-up conditions, low load conditions, malfunctioning gas treatment components, or a combination thereof, can complicate the use of gas treatment systems. Therefore, a need exists for a gas treatment system having a bypass system configured to bypass the gas treatment system under certain conditions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2018 / 0156136 Summary of the Invention

[0004] Certain embodiments commensurate in scope with the initially claimed subject matter are summarized below. These embodiments are not intended to limit the scope of the claimed embodiments; rather, these embodiments are intended only to provide a brief summary of possible forms of the present subject matter. Indeed, the embodiments claimed herein may include a variety of forms that may be similar to or different from the embodiments set forth below.

[0005] In certain embodiments, the system includes a bypass system having a first valve, a first driver coupled to the first valve, and a controller coupled to the first driver. The controller is configured to operate the first driver to move the first valve between a first position and a second position. The first position of the first valve opens a gas processing flow path for exhaust gas flow from the gas turbine engine and closes a bypass flow path. The second position of the first valve closes the gas processing flow path and opens the bypass flow path for exhaust gas flow from the gas turbine engine. The gas processing flow path is configured to extend through a gas processing system having a gas capture system. The bypass flow path is configured to bypass the gas processing system having the gas capture system.

[0006] In certain embodiments, the system includes a controller coupled to a bypass system having a first driver coupled to a first valve, the controller configured to operate the first driver to move the first valve between a first position and a second position. The first position of the first valve opens a gas processing flow path for exhaust gas flow from the gas turbine engine and closes a bypass flow path. The second position of the first valve closes the gas processing flow path and opens the bypass flow path for exhaust gas flow from the gas turbine engine. The gas processing flow path is configured to extend through the gas processing system having a gas capture system. The bypass flow path is configured to bypass the gas processing system having the gas capture system.

[0007] In certain embodiments, a method includes controlling a first driver to move a first valve of a bypass system to a first position to open a gas processing flow path for exhaust gas flow from the gas turbine engine and close a bypass flow path, the gas processing flow path being configured to extend through the gas processing system having a gas capture system. The method also includes controlling the first driver to move the first valve of the bypass system to a second position to close the gas processing flow path for exhaust gas flow from the gas turbine engine and open a bypass flow path, the bypass flow path being configured to bypass the gas processing system having the gas capture system.

[0008] These and other features, aspects, and advantages of the presently disclosed technology will be better understood from the following detailed description when taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram of an embodiment of a combined cycle power plant having a bypass system for a gas processing system with a gas capture system, the combined cycle power plant including a gas turbine engine, a heat recovery steam generator (HRSG), and a steam turbine. [Figure 2] FIG. 2 is a block diagram of an embodiment of the combined cycle power plant of FIG. 1 further illustrating details of the gas capture system and bypass system. [Figure 3] 2 is a schematic diagram of an embodiment of the combined cycle power plant of FIG. 1 further illustrating a lower level bypass configuration of a bypass system coupled to an exhaust stack. [Figure 4] FIG. 4 is a schematic diagram of an embodiment of the combined cycle power plant of FIGS. 1-3, further illustrating an upper level bypass configuration of a bypass system coupled to an exhaust stack. [Figure 5]FIG. 5 is a schematic diagram of an embodiment of the combined cycle power plant of FIGS. 1-4, further illustrating details of a bypass system coupled to an exhaust stack and a gas treatment system. [Figure 6] FIG. 6 is a schematic diagram of an embodiment of a seal gas system of the combined cycle power plant of FIGS. 1-5 showing details of the seal system coupled to the seal components, seal gas injector, and bypass system. DETAILED DESCRIPTION OF THE INVENTION

[0010] Described below are one or more specific embodiments of the system of the present disclosure. While an effort is made to provide a concise description of these embodiments, not all features of an actual implementation may be described herein. It should be understood that in developing an actual implementation, such as an engineering or design project, many implementation-specific decisions must be made to achieve the developer's particular objectives, including, for example, adherence to system-related and business-related constraints, and that these constraints may vary from implementation to implementation. It should also be understood that such a development effort may be complex and time-consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those skilled in the art having the benefit of this disclosure.

[0011] When introducing elements of various embodiments of the presently disclosed embodiments, the words "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.

[0012] Disclosed embodiments include systems and methods for bypassing a gas processing system, such as a carbon capture system, using a bypass system. The bypass system is configured to divert exhaust gas flow through an exhaust stack when a bypass is required for the gas processing system. For example, the bypass system can include a damper system configured to move between a first position that routes the exhaust flow through the gas processing system and a second position that routes the exhaust flow through the exhaust stack. A control system can be coupled to the bypass system and the monitoring system to determine when to move the bypass system between the first and second positions. The seal system can also route a sealing fluid flow (e.g., a sealing gas flow) to one or more seals of the bypass system to prevent leakage of exhaust gas, undesirable gases (e.g., x) trapped within the gas processing system, or a combination thereof. For example, the sealing fluid flow can include an inert gas flow, such as an air flow and / or a nitrogen flow. The seal system is configured to pressurize the sealing fluid flow, thereby providing a sealing pressure greater than adjacent flows to help prevent leakage. Various aspects and embodiments of the gas processing system are described in further detail below.

[0013] FIG. 1 is a block diagram of an embodiment of a combined cycle power plant 10 having a gas turbine engine 12 coupled to a control system 14. As described in further detail below, the combined cycle power plant 10 may include a gas processing system 16 for processing one or more gases within the gas turbine engine 12. In the disclosed embodiment, the gas processing system 16 includes a gas capture system 100 having a bypass system 102 configured to bypass the gas processing system 16 under certain conditions (e.g., startup conditions, low load conditions, malfunction of a gas processing component such as a tripped fan, etc.). Various features of the gas processing system 16 are described in further detail below, and the various features may be used in any suitable combination with one another. However, before turning to the gas processing system 16, the combined cycle power plant 10 will be described as one possible context for using the gas processing system 16.

[0014] The gas turbine engine 12 includes an intake section 18, a compressor section 20, a combustor section 22, a turbine section 24, a load 26, and an exhaust section 28. The intake section 18 may include a duct having one or more silencer baffles, a fluid injection system (e.g., heated fluid injection for ice protection), an air filter, or any combination thereof. The compressor section 20 may include an upstream inlet duct 30 having a bellmouth 32, the inlet duct 30 including an intake air path between an inner hub 34 and an outer wall 36. The inlet duct 30 also includes stationary vanes 38 and inlet guide vanes (IGVs) 40. The inlet guide vanes 40 may also be coupled to one or more actuators 42 that are communicatively coupled to and controlled by the control system 14.

[0015] The compressor section 20 includes one or more compressor stages 44, each of which includes a plurality of compressor blades 46 coupled to a compressor shaft 48 within a compressor casing 50 and a plurality of compressor vanes 52 coupled to the compressor casing 50. The compressor blades 46 and compressor vanes 52 are arranged circumferentially about the central axis of the compressor shaft 48 in each compressor stage 44. The compressor stages 44 may include one to thirty or more compressor stages. Further, the compressor stages 44 alternate between sets of compressor blades 46 and sets of compressor vanes 52 in the direction of airflow through the compressor section 20. During operation, the compressor stages 44 progressively compress the intake airflow before delivery to the combustor section 22.

[0016] The combustor section 22 includes one or more combustors 54 having one or more fuel nozzles 56. In certain embodiments, the combustor section 22 may have a single annular combustor 54 extending around the central axis of the gas turbine engine 12. However, in some embodiments, the combustor section 22 may include two, three, four, five, six, or more combustors 54 spaced circumferentially around the central axis of the gas turbine engine 12. The fuel nozzles 56 receive compressed air 58 from the compressor section 20 and fuel 60 from one or more fuel supply systems 62, mix the fuel and air, and ignite the mixture to generate hot combustion gases 64, which then exit each combustor 54 and enter the turbine section 24. In certain embodiments, a fuel processing system 61 may process the fuel before delivering it to the fuel nozzles 56. For example, the fuel processing system 61 may include one or more fuel processing components 63, such as a fuel filter, a water removal unit, an acid gas treatment unit, or any combination. However, in certain embodiments, the fuel processing system 61 may be excluded.

[0017] The turbine section 24 includes one or more turbine stages 66, each of which includes a plurality of turbine blades 68 circumferentially disposed about a turbine shaft 70 inside a turbine casing 72 and a plurality of turbine vanes 74 circumferentially disposed about the turbine shaft 70. The turbine stages 66 may include one to ten or more turbine stages. Further, the turbine stages 66 alternate between sets of turbine blades 68 and sets of turbine vanes 74 in the direction of hot combustion gas flow through the turbine section 24. During operation, the hot combustion gases 64 gradually expand, driving rotation of the turbine blades 68 of the turbine stages 66.

[0018] The load 26 may include a generator, a machine, or some other driving load. The load 26 may be located at the hot end of the gas turbine engine 12, as shown in FIG. 1 , or the load 26 may be located at the cold end of the gas turbine engine 12 (e.g., adjacent the compressor section 20). The exhaust section 28 may include an exhaust duct, an exhaust treatment device, a silencer, or any combination thereof. In some embodiments, the exhaust section 28 may include and / or direct the exhaust flow through a heat exchanger and / or a cooling system. As described below, the exhaust section 28 may include or be fluidly coupled to the gas treatment system 16.

[0019] The control system 14 may include one or more controllers 76, each having a processor 78, a memory 80, instructions 82 stored in the memory 80 and executable by the processor 78, and communication circuitry 84 configured to communicate with the gas processing system 16. The control system 14 is also coupled to various sensors (S), indicated by element numeral 86, distributed throughout the combined cycle power plant 10. For example, the sensors 86 may be coupled to and monitor conditions of the intake section 18, the compressor section 20, the fuel supply system 62, the combustors 54 of the combustor section 22, the turbine section 24, the load 26, the exhaust section 28, and the gas processing system 16 (e.g., the gas capture system 100 and the bypass system 102). The control system 14 is configured to receive feedback from the sensors 86 to facilitate adjustment of various operating parameters of the gas turbine engine 12, such as the intake air flow, the fuel supply from the fuel supply system 62 to the combustors 54, the operation of the exhaust treatment devices in the exhaust section 28, the operation of the gas processing system 16, or any combination thereof. For example, the control system 14 is configured to operate the bypass system 102 based on feedback from the sensors 86 indicating conditions affecting the operation of the gas processing system 16, such as a start-up condition of the combined cycle power plant 10, a low load condition of the combined cycle power plant 10, a malfunction or other performance issue of the gas processing system 16, or any combination thereof. As an example, the sensors 86 may provide feedback (e.g., an alert, alarm, or trip of a controller) indicating a malfunctioning gas processing component, such as a fan (e.g., booster fan 145), a pump, a valve, an electrical actuator, a steam circulation system, a sorbent-based system of the gas capture system 100, a solvent-based system of the gas capture system 100, a controller of the gas capture system 100, or any combination thereof. Based on the feedback from the sensors 86, the control system 14 may be configured to operate the bypass system 102 to bypass the exhaust gas flow around the gas processing system to the exhaust stack. Further details of the bypass system 102 are described in greater detail below.

[0020] During operation, the gas turbine engine 12 receives air from the intake section 18 into the inlet duct 30, as indicated by arrow 88, and the inlet guide vanes 40 are controlled by the actuators 42 to adjust the angular position of the inlet guide vanes 40 to regulate the airflow into the compressor section 20, which is configured to compress the airflow that is delivered to the combustor section 22. For example, each stage 44 of the compressor section 20 compresses the airflow with a plurality of blades 46. The compressed airflow 58 then enters each of the combustors 54, and fuel nozzles 56 mix the compressed airflow with fuel 60 from a fuel supply system 62. The fuel and air mixture is then combusted in each combustor 54 to generate hot combustion gases 64 that flow into the turbine section 24 and drive the rotation of the turbine blades 68 in each of the stages 66. The rotation of turbine blades 68 drives the rotation of turbine shaft 70, which in turn drives the rotation of load 26 and compressor section 20 via shaft 90 coupled to load 26 and shaft 92 coupled to compressor shaft 48. Turbine section 24 then discharges exhaust gases 94 to exhaust section 28 for final treatment and discharge to the environment.

[0021] In the illustrated embodiment, the exhaust section includes a heat recovery steam generator (HRSG) 96 configured to transfer heat from the exhaust gas to water, thereby generating steam to drive a steam turbine system 98. Thus, in the illustrated embodiment, the combined cycle power plant 10 has the gas turbine engine 12 that generates electricity and produces exhaust gas, the HRSG 96 that generates steam from the exhaust gas, and the steam turbine system 98 that generates electricity from the steam. The HRSG 96 may include multiple heat exchangers and / or heat exchange components disposed in different sections, such as a high-pressure (HP) section, an intermediate-pressure (IP) section, and a low-pressure (LP) section. The components may include an economizer, an evaporator, a superheater, or any combination thereof, in each of the HP, IP, and LP sections. Similarly, the steam turbine system 98 may include multiple steam turbine sections, such as a high-pressure (HP) steam turbine, an intermediate-pressure (IP) steam turbine, and a low-pressure (LP) steam turbine. During operation, low pressure (LP), intermediate pressure (IP), and high pressure (HP) steam may be supplied from the LP, IP, and HP sections of HRSG 96 to drive the LP, IP, and HP steam turbines, respectively, of steam turbine system 98. Additionally, LP, IP, and / or HP steam from HRSG 96 may be supplied to gas processing system 16 for use in gas capture system 100.

[0022] Downstream of the HRSG 96, the exhaust gases may flow through one or more coolers 99, such as direct coolers and / or indirect coolers (e.g., heat exchangers). The coolers 99 may include, for example, direct contact coolers configured to spray a fluid (e.g., a liquid such as water) directly onto the exhaust gases to directly cool the exhaust gases. The coolers 99 are configured to reduce the temperature of the exhaust gases upstream of the gas treatment system 16.

[0023] In the illustrated embodiment, the gas turbine system 10 has a gas processing system 16 coupled to the exhaust section 28 (e.g., for exhaust gas processing along the exhaust flow path). However, the gas processing system 16 may also be coupled to one or more reciprocating piston-cylinder engines, a furnace, a boiler, a chemical reactor, a gasification system having one or more gasifiers configured to produce syngas, or other industrial equipment. Each of these gas processing systems 16 has features described in further detail below, and the disclosed embodiments are intended to be used in various combinations with one another in all of the aforementioned applications. As described below, the gas processing system 16 is described for illustrative purposes in the context of an exhaust flow path. The gas processing system 16 is configured to remove and capture one or more undesirable gases (e.g., acid gases and / or exhaust gases) from the exhaust gas in a gas capture system 100. The gas capture system 100 may include a sorbent-based gas capture system, a solvent-based gas capture system, or any combination thereof.

[0024] During operation of gas capture system 100 (e.g., a sorbent-based gas capture system), the sorbent material is configured to adsorb undesirable gases from the exhaust gas during an adsorption mode, and the sorbent material is configured to desorb undesirable gases from the exhaust gas during a desorption mode. The adsorption mode is an exothermic process, and the desorption mode is an endothermic process. During the desorption mode, a heat source is used to apply heat to the sorbent material, thereby desorbing the undesirable gases from the sorbent material. The heat source can include any suitable heat transfer fluid, such as a liquid and / or a gas. For example, the heat source can include steam and / or heated water. In certain embodiments, gas capture system 100 can include a vacuum system configured to flow-assisted the drawing of undesirable gases from the sorbent material of gas capture system 100, e.g., a sorbent-based gas capture system.

[0025] During operation of gas capture system 100 (e.g., a solvent-based gas capture system), the absorber is configured to circulate both the exhaust gas and the solvent through the tanks in a counter-flow arrangement. For example, the absorber can circulate the exhaust gas vertically upward while the absorber circulates the solvent vertically downward. The solvent absorbs undesirable gases from the exhaust gas. Upon exiting the absorber, the solvent subsequently flows through a regeneration unit, which uses steam to help separate or remove the undesirable gases from the solvent. Thus, gas capture system 100 can include one or both of an adsorbent-based gas capture system and a solvent-based gas capture system to remove and capture undesirable gases from the exhaust gas.

[0026] Undesirable gases include any gas that may be undesirable in the fuel supply and / or exhaust gases. For example, undesirable gases may include acid gases present in the fuel supply and exhaust gases. By way of further example, undesirable gases in exhaust gases include, but are not limited to, carbon oxides (CO), such as carbon dioxide (CO) and carbon monoxide (CO). X ), nitrogen oxides such as nitrogen dioxide (NO2) X ), sulfur dioxide (SO2) and other sulfur oxides (SO X The gas capture may include any typically regulated exhaust gas, including CO, CO� ...

[0027] The gas processing system 16 may include a fluid supply system 104 configured to supply one or more fluids 106 to the gas capture system 100. The fluids 106 (e.g., gas, liquid, and / or steam) may include a purge fluid, a heating fluid, a cooling fluid, or any combination thereof. For example, the fluids 106 may include heated water and / or steam 108. The steam 108 may be generated by and / or supplied from one or more additional steam generators, such as the HRSG 96, the steam turbine system 98, and / or a boiler 110. The boiler 110 (e.g., a stand-alone or external boiler) is configured to generate the steam 108 from a heat source (e.g., combustion in the boiler 110). The fluids 106 (e.g., heated water and / or steam 108) may be used by the gas capture system 100 to help separate and capture undesirable gases from the exhaust gases.

[0028] During operation, the gas capture system 100 receives and processes the exhaust gas 94 by removing and capturing undesirable gases, thereby outputting a treated gas 112 (e.g., a treated exhaust gas) and a captured gas 114. The treated gas 112 is lean (or substantially free) of the undesirable gas. The captured gas 114 is enriched in or substantially consists of the undesirable gas. The gas capture system 100 uses a fluid 106 (e.g., heated water and / or steam 108) to facilitate the gas capture process, for example, by providing heat to facilitate desorption of the undesirable gas from the adsorbent material in an adsorbent-based gas capture system and / or to separate the undesirable gas from the solvent in a solvent-based gas capture system. The treated gas 112 then passes through an exhaust stack. The captured gas 114 may be routed through downstream equipment 116, such as a dehydration system, a compression system, storage, and / or a pipeline, or a combination thereof.

[0029] During operation, the control system 14 can operate the bypass system 102 to (1) allow the exhaust gas flow to pass through the gas treatment system 16 (e.g., the gas capture system 100) to remove and capture undesirable gases, or (2) bypass the exhaust gas flow through the exhaust stack without forcing the exhaust gases through the gas treatment system 16 (e.g., the gas capture system 100), based on feedback from the sensors 86, user input, a start-up condition, a low load condition, a malfunction or performance issue in the gas treatment system 16 (e.g., a fan such as a booster fan), or any combination thereof. Details of the bypass system 102 are described in further detail below.

[0030] FIG. 2 is a block diagram of an embodiment of the combined cycle power plant 10 of FIG. 1 , further illustrating details of the gas capture system 100 and bypass system 102 of the gas processing system 16. The combined cycle power plant 10 has a gas turbine engine 12 configured to combust fuel to produce exhaust gas 94, which passes through an HRSG 96 to produce a steam turbine 98 and steam 108 for the gas processing system 16. The gas processing system 16, including one or more gas capture systems 100, is configured to receive and use steam 108 and / or heated water from the HRSG 96 and / or steam turbine 98 to facilitate the removal and capture of undesirable gases (e.g., CO) from the exhaust gas under one or more conditions (e.g., temperature, pressure, steam / water content). As mentioned above, the gas capture system 100 may be well suited for the removal and capture of CO, however, the undesirable gases may also include carbon oxides (CO), such as carbon dioxide (CO) and carbon monoxide (CO). X ), nitrogen oxides such as nitrogen dioxide (NO2) X ), sulfur dioxide (SO2) and other sulfur oxides (SO X ), or any combination thereof.

[0031] For example, in the illustrated embodiment, the gas turbine engine 12 is drivingly coupled to a load 26, such as an electrical generator. Similarly, the steam turbine 98 is drivingly coupled to a load 120, such as an electrical generator. Collectively, the gas turbine engine 12 and the steam turbine 98 drive the loads 26 and 120 (e.g., electrical generators) to generate electricity for the combined cycle power plant 10 and the power grid. The HRSG 96 may include multiple sections, such as a low-pressure (LP) section 122, an intermediate-pressure (IP) section 124, and a high-pressure (HP) section 126, which are configured to generate steam 108 as low-pressure (LP) steam, intermediate-pressure (IP) steam, and high-pressure (HP) steam, respectively. The HRSG 96 transfers heat from the exhaust gases 94 to water and / or steam to generate LP, IP, and HP steam. In certain embodiments, the steam turbine 98 includes multiple steam turbine sections, such as a low-pressure (LP) steam turbine section, an intermediate-pressure (IP) steam turbine section, and a high-pressure (HP) steam turbine section, which are driven by LP, IP, and HP steam, respectively. Additionally, the gas processing system 16 may receive and use steam 108, e.g., one or more of LP, IP, and HP steam, and / or heating water, from the HRSG 96 and / or the steam turbine 98. After generating the steam 108, the HRSG 96 sends the exhaust gases 94 to an exhaust stack 128.

[0032] In the illustrated embodiment, bypass system 102 may be coupled to exhaust stack 128, and bypass system 102 may be disposed at least partially or substantially within exhaust stack 128, an adjacent exhaust duct, HRSG 96, and / or gas processing system 16. Bypass system 102 is configured to control the direction of exhaust gases 94 along either a gas processing flow path 130 or a bypass flow path 132. For example, gas processing flow path 130 may extend through gas processing system 16 and downstream device 116 to process exhaust gases 94. In contrast, bypass flow path 132 may extend upward through exhaust stack 128 to an exhaust opening 134, from which exhaust gases are discharged as exhaust stream 136. Thus, bypass flow path 132 does not pass through gas processing system 16; rather, bypass flow path 132 routes exhaust gases 94 to bypass gas processing system 16.

[0033] The bypass system 102 may include multiple flow control components 138, such as a first flow control valve or diverter damper 140, a second flow control valve or guillotine damper 142, and a seal gas system 144. The first flow control valve or diverter damper 140 may include an N-port valve or damper, an N-way valve or damper, or a combination thereof, where N is at least 3 or more. In other words, the first flow control valve or diverter damper 140 may include an inlet (e.g., an exhaust gas inlet for the exhaust gas 94), a first outlet (e.g., an exhaust gas treatment outlet to the exhaust gas flow path 130), and a second outlet (e.g., a bypass outlet to the bypass flow path 132). The first flow control valve or diverter damper 140 may include additional inlets and / or outlets for various applications, sampling, treatment, or uses of the exhaust gas 94. In the following description, the first flow control valve or diverter damper 140 is generally referred to as a diverter damper as one possible example, although various configurations for the bypass system 102 are contemplated. However, the diverter damper 140 may generally be configured to switch or alternate flow configurations between the gas processing flow path 130 (e.g., gas processing mode) and the bypass flow path 132 (e.g., bypass mode). While multiple valves can be used for such flow control, the disclosed embodiments use the diverter damper 140 for reduced complexity, improved performance, and improved controllability in the combined cycle power plant 10.

[0034] As described in further detail below, the controller 76 is coupled to the diverter damper 140 (e.g., a driver or actuator), and the controller 76 is configured to move the diverter damper 140 between a first position and a second position, the first position of the diverter damper 140 opening the gas processing flow path 130 and closing the bypass flow path 132 for the exhaust gases 94 from the gas turbine engine 12. The second position of the diverter damper 140 closing the gas processing flow path 130 and opening the bypass flow path 132 for the exhaust gases 94 from the gas turbine engine 12. Again, the gas processing flow path 130 is configured to extend through the gas processing system 16 having the gas capture system 100, and the bypass flow path 132 is configured to bypass the gas processing system 16 having the gas capture system 100. In other words, the first position of the diverter damper 140 prevents the exhaust flow 94 from exiting the exhaust stack 128 through the outlet 134 and directs the exhaust flow 94 along the gas processing flow path 130 and into the gas processing system 16. The second position of the diverter damper 140 prevents the exhaust gases 94 from entering the gas processing system 16 along the gas processing flow path 130, and the diverter damper 140 directs the exhaust gases 94 to flow upward through the exhaust stack 128 and through the outlet 134. As described below, the diverter damper 140 may include a rotatable door, plate, panel, blade, or valve element coupled to a drive device controlled by the controller 76. However, the diverter damper 140 may have other configurations for switching the flow of exhaust gases between the gas processing flow path 130 and the bypass flow path 132.

[0035] Additionally and optionally, a second flow control valve or guillotine damper 142 may be included to aid in isolation of the gas processing system 16 when operating in a bypass mode in which the diverter damper 140 closes the gas processing flow path 130 and opens the bypass flow path 132. The second flow control valve or guillotine damper 142 may include an N-port valve or damper, an N-way valve or damper, or a combination thereof, where N is at least 2 or greater. In the illustrated embodiment, the second flow control valve or guillotine damper 142 may be designed as a two-port or two-way valve or damper to open and close the gas processing flow path 132. In the following description, the second flow control valve or guillotine damper 142 will be generally referred to as a guillotine damper as one possible example, although various configurations for the bypass system 102 are contemplated.

[0036] In operation, diverter damper 140 may be complemented by guillotine damper 142 to provide a more reliable seal to block fluid flow between gas processing system 16 and exhaust stack 128, for example, to prevent the flow of undesirable gases (e.g., CO) from escaping gas processing system 16. As described below, guillotine damper 142 may include an axially movable plate, panel, blade, or valve element coupled to a driver controlled by controller 76. Controller 76 operates the driver to move guillotine damper 142 linearly up and down to open and close the flow of fluid along gas processing flow path 130 into and through gas processing system 16.

[0037] Diverter damper 140 and guillotine damper 142 may each include one or more seals configured to provide an airtight seal to prevent leakage, such as leakage of exhaust gas 94, undesirable gases (e.g., CO), or any combination thereof. In the illustrated embodiment, bypass system 102 also has a seal gas system 144 configured to provide a seal gas to diverter damper 140 and / or guillotine damper 142 to help provide a buffer gas to prevent gas leakage. Details of seal gas system 144 are described in further detail below. Overall, bypass system 102 is configured to move between either two configurations: (1) a gas treatment mode, in which gas treatment flow path 130 is opened and bypass flow path 132 is closed, thereby allowing the flow of exhaust gas through gas treatment system 16; or (2) a bypass mode, in which gas treatment flow path 130 is closed and bypass flow path 132 is opened, thereby bypassing the flow of exhaust gas through gas treatment system 16. The controller 76 is coupled to the bypass system 102 and provides control of the diverter damper 140, the guillotine damper 142, and the seal gas system 144 during operation to provide the correct direction of flow and sealing based on various conditions of the combined cycle power plant 10.

[0038] For example, the controller 76 may monitor various sensors 86 to determine whether conditions are suitable for gas processing in the gas processing system 16 or whether a bypass is recommended for the exhaust gas 94. In certain embodiments, the bypass system 102 is operated by the controller 76 to bypass the exhaust gas 94 through the exhaust stack 128 and discharge it through an outlet 134 rather than through the gas processing system 16 based on one or more of a start-up condition of the combined cycle power plant 10, a low part-load condition of the combined cycle power plant 10, a malfunction or performance issue (e.g., a fan, pump, valve, drive, etc.) of the gas processing system 16, a malfunction or issue of the downstream equipment 116, or any other suitable user input or sensor feedback from the sensors 86. For example, the controller 76 may operate the bypass system 102 to bypass the gas processing system 16 due to a problem (e.g., tripping, failure, or malfunction) of one or more fans driving the flow of exhaust gas 94 through the gas processing system 16 (e.g., gas capture system 100), which may result in insufficient flow of exhaust gas 94 through the gas processing system 16. As a further example, the controller 76 may operate the bypass system 102 to bypass the gas processing system 16 due to a high level of NO that is detrimental to the gas capture process (e.g., carbon capture of CO) in the gas capture system 100. X Excretion (e.g., NO X NO above threshold X A start-up condition having a low or high pressure (low level) may activate bypass system 102 to bypass gas processing system 16. In a further example, controller 76 may activate bypass system 102 to bypass gas processing system 16 due to a low part load condition that may result from insufficient bottoming cycle steam to supply a gas capture process (e.g., carbon capture of CO) within gas capture system 100.

[0039] The gas processing system 16 can include one or more of the same or different types of gas capture systems 100. As described above, the gas capture system 100 can include one or more fans 145 (e.g., booster fans), a sorbent-based gas capture system 146, and / or a solid-based gas capture system 148. The one or more fans 145 (e.g., electric motor-driven fans) are configured to increase the pressure of the exhaust gas 94 flowing through the gas processing system 16, and particularly through the one or more gas capture systems 100. Each of the gas capture systems 146 and 148 can include multiple gas capture components, such as flow control valves, pumps, fans, heaters, coolers, actuators or drivers, sensors, and / or other controllable elements that control the gas capture process. For example, one or more fans (e.g., electric motor-driven fans) can be provided upstream, downstream, or within the gas capture system 100 (e.g., 146 and / or 148) to help force the exhaust gas 94 through the gas capture system 100. One or more fans may be in addition to the one or more fans 145 described above. If one or more of these fans malfunction and / or are unable to provide sufficient pressure for the exhaust gas 94, the bypass system 102 may be operated by the controller 76 to bypass the gas processing system 16. The gas capture system 100 (e.g., 146 and / or 148) may also include one or more components specific to the type of gas capture, e.g., sorbent-based or solvent-based gas capture. For example, the sorbent-based gas capture system 146 may include gas capture components 150, 152, and 154. Similarly, the solvent-based gas capture system 148 may include multiple gas capture components, e.g., gas capture components 156, 158, and 160.

[0040] The sorbent-based gas capture system 146 can have a variety of configurations and operating characteristics using gas capture components 150, 152, and 154. In certain embodiments, the gas capture component 150 can include a sorbent material 150 configured to adsorb undesired gases (e.g., CO) from the exhaust gas 94 during an adsorption mode and desorb the undesired gases from the sorbent material 150 during a desorption mode. The gas capture component 152 can include a mode controller 152 configured to control operating characteristics to either allow the flow of the exhaust gas 94 through the sorbent material 150 for adsorption or inhibit the flow of the exhaust gas 94 through the sorbent material 150 and apply heat to facilitate desorption of the undesired gases from the sorbent material 150. For example, the sorbent-based gas capture system 146 can supply a heat source, such as steam 108 and / or heated water, to the sorbent material 150 during a desorption mode controlled by the mode controller 152. In certain embodiments, the mode controller 152 can alternately pass either the flow of exhaust gas 94 or the flow of vapor 108 through the sorbent material 150 during the adsorption and desorption modes, respectively, of the sorbent-based gas capture system 146. The sorbent-based gas capture system 146 can use a gas capture component 154 to aid in the extraction and / or capture of undesired gases after desorption from the sorbent material 150. For example, if the sorbent-based gas capture system 146 uses vapor 108 during the desorption mode, the gas capture component 154 can condense the vapor into water and / or generally separate the undesired gases from the vapor 108 to provide the captured gas 114, which is then processed by the downstream device 116. For example, the gas capture component 154 can include a vacuum system, a separator, or a combination thereof, where the vacuum system is configured to create a vacuum to draw the vapor and undesired gases into the separator, and the separator is configured to separate the undesired gases (e.g., CO) from the vapor 108. For example, the separator may include a water-gas separator, a cooler and / or a condenser, or a combination thereof.

[0041] The mode controller 152 can include various controls for alternating between the respective adsorption and desorption modes (or ranges of the adsorbent material 150) of the adsorbent-based gas capture system 146. In some embodiments, the adsorbent-based gas capture system 146 can continuously move the adsorbent material 150 (e.g., an adsorbent material wheel, disk, or rotor) between different flow paths of the exhaust gas 94 and the vapor 108, thereby continuously alternating between exposing the adsorbent material 150 to the exhaust gas 94 for adsorption of undesired gases and subsequently exposing the adsorbent material 150 to the vapor 108 for desorption of undesired gases. In some embodiments, the adsorbent-based gas capture system 146 can include a movable cartridge of the adsorbent material 150 that can selectively move back and forth between the exhaust gas 94 and the vapor 108 flow paths. In certain embodiments, the adsorbent-based gas capture system 146 can use the mode controller 152 to control valves and other flow control devices to alternate the flow of the exhaust gas 94 and the vapor 108 through one or more flow paths, each having an adsorbent material 150. Thus, the adsorbent-based gas capture system 146 can have various configurations that use adsorbent material 150 to perform adsorption and desorption modes to capture undesirable gases from the exhaust gas 94 and generate the captured gas 114.

[0042] The solvent-based gas capture 148 can also have various configurations that use a solvent (or other fluid) to capture undesired gases from the exhaust gas 94 to produce the captured gas 114. In certain embodiments, the gas capture components 156, 158, and 160 can each include a cooler, an absorber, and a stripper. Thus, the cooler 156 is configured to cool the exhaust gas 94 before it enters the absorber 158. The cooler 156 can be a direct cooler and / or an indirect cooler or heat exchanger. For example, in certain embodiments, the cooler 156 can be a direct contact cooler configured to spray a coolant, such as water, directly into the exhaust gas 94's gas processing flow path 130, thereby directly cooling the exhaust gas 94. However, the cooler 156 can also include an indirect cooler or heat exchanger that uses water or another coolant to transfer heat from the exhaust gas 94 along the gas processing flow path 130. The absorber 158 generally includes a vessel or housing that provides counterflow of the exhaust gas 94 and the solvent. For example, the absorber 158 may induce the exhaust gas 94 to flow upward through the solvent in the absorber 158, while inducing the solvent to travel downward through the absorber 158. The solvent in the absorber 158 is configured to capture or absorb undesired gases from the exhaust gas 94, such that the absorber 158 outputs the treated gas 112 and a gas-enriched solvent (e.g., CO2-enriched solvent) having the undesired gas (e.g., CO2). The gas-enriched solvent then flows through a stripper 160 configured to strip the undesired gas from the gas-enriched solvent to produce the captured gas 114. For example, in certain embodiments, the stripper 160 may use steam 108 to assist in stripping the undesired gas from the gas-enriched solvent. As will be appreciated, the solvent-based gas capture system 148 may have a variety of configurations and solvent types for capturing undesired gases from the exhaust gas 94.

[0043] Thus, gas processing system 16 may include one or more different or same types of gas capture systems 100, e.g., an adsorbent-based gas capture system 146 and a solvent-based gas capture system 148, arranged in series and / or parallel with one another. In some embodiments, gas capture system 100 includes only one type of gas capture system 100, e.g., an adsorbent-based gas capture system 146 or a solvent-based gas capture system 148. Gas processing system 16 generally outputs treated gas 112, which may then be directed to exhaust stack 128 for discharge from outlet 134 or a separate exhaust stack. Gas processing system 16 also discharges trapped gas 114 for further processing by downstream device 116.

[0044] In the illustrated embodiment, the downstream equipment 116 includes a dehydration system 162, a compression system 164, and a storage and / or pipeline system 166. The dehydration system 162 is configured to dehydrate, or generally remove, moisture from the captured gas 114 via one or more dehydration components 168. For example, the dehydration component 168 may include a heat exchanger 170, a separator 172, and a water collector 174. The heat exchanger 170 may be configured to cool the captured gas 114, thereby causing condensation of any moisture within the captured gas 114. The separator 172 may include a water-gas separator for separating the condensed water from the captured gas 114. In certain embodiments, the separator 172 may include a gravity separator, a centrifugal separator, or any other type of separation unit, or any combination thereof. The water collector 174 may be configured to collect the condensed and separated water and return the water to a water supply system 176 for subsequent use in the combined cycle power plant 10. In some embodiments, the water collector 174 may include a drainage system, a water tank, a water pump, a water filter, or any combination thereof. As will be appreciated, the dehydration system 162 may include any one or more types of dehydration components 168. After performing various dehydration processes, the dehydration system 162 outputs the trapped gas 114 as dry trapped gas 178 for subsequent compression in the compression system 164.

[0045] Compression system 164 may include multiple compressor components 180, such as compressor 182, compressor 184, and an intercooler or cooling heat exchanger 186. For example, compressor 182 may be configured to compress dry capture gas 178 in a first compression stage, intercooler 186 may be configured to cool dry capture gas 178 after the first compression stage by compressor 182, and compressor 184 may be configured to compress dry capture gas 178 in a second compression stage after cooling by intercooler 186. In certain embodiments, compression system 164 may be a single-stage compressor, or compression component 180 may include three, four, five, or more compressors and associated intercoolers. Compression system 164 then outputs compressed capture gas 188 to storage and / or pipeline system 166. Thus, the compressed captured gas 188 may be used for a variety of purposes, either locally within the combined cycle power plant 10 or remotely via the storage and / or pipeline system 166 .

[0046] The feedwater system 176 may receive fresh water, condensate, or other plant water from various sources throughout the combined cycle power plant 10. For example, the feedwater system 176 may receive water from the dehydration system 162, as indicated by arrow 190 (e.g., a water conduit), from the compression system 164, as indicated by arrow 192 (e.g., a water conduit), and from the gas processing system 16, as indicated by arrow 194 (e.g., a water conduit). The feedwater system 176 may also supply water to various devices throughout the combined cycle power plant 10. For example, the feedwater system 176 may supply water to the HRSG 96 (e.g., via a water conduit) for steam generation of the steam 108 and to the gas processing system 16 for use in various cooling processes within the gas capture system 100. For example, the cooler 156 of the solvent-based gas capture system 148 may use water from the feedwater system 176. Given the various sources and uses of water, the water supply system 176 may include multiple water components 196, such as a water reservoir 198, a thermal control system 200, and a water treatment system 202. The water reservoir 198 may include a water storage vessel, a water tower, a water supply conduit, a water tank or reservoir, or any combination thereof. The thermal control system 200 may include a heat exchanger and / or a cooling system that may be configured to control the temperature of the water depending on the desired use throughout the combined cycle power plant 10. For example, the thermal control system 200 may include a cooling tower, an indirect heat exchanger that uses another thermal fluid to provide cooling, one or more fans, a refrigeration system, a heating system that uses heat from various sources within the combined cycle power plant 10, or any combination thereof. The water treatment system 202 may include one or more of a filtration system, a chemical treatment system, an impurity removal system, or any combination thereof. Thus, the water supply system 176 may supply thermally controlled and treated water to various locations throughout the combined cycle power plant 10, including, but not limited to, the HRSG 96 and the gas processing system 16.

[0047] During operation, the controller 76 is configured to control the bypass system 102 to facilitate continued operation of the combined cycle power plant 10 in response to various conditions affecting the operation of the gas processing system 16. For example, if the controller 76 determines that the gas processing system 16 should not receive a flow of exhaust gas 94 for processing based on one or more inputs, the controller 76 may operate the bypass system 102 to block the flow of exhaust gas 94 along the gas processing flow path 130 and bypass the exhaust gas 94 along the bypass flow path 132 and out through an outlet 134 of the exhaust stack 128. The one or more inputs may include, for example, one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, that affect the effective operation of the gas processing system 16 with the gas capture system 100. Conversely, if the controller 76 determines that conditions are suitable for gas processing in the gas processing system 16, the controller 76 can operate the bypass system 102 to allow the flow of exhaust gas 94 along the gas processing flow path 130 through the gas processing system 16 and the downstream device 116, while generally blocking the flow of exhaust gas 94 out through the exhaust outlet 134 of the exhaust stack 128.

[0048] In certain embodiments, the controller 76 may operate the bypass system 102 based on various feedback from the sensors 86, user inputs, alerts and alarms related to problems with the gas processing system 16, the dehydration system 162, or the compression system 164, the current state of the combined cycle power plant 10 (e.g., start-up conditions, low load conditions, or other conditions), or any combination thereof. In this manner, the bypass system 102 allows the combined cycle power plant 10 to continue operating even when the gas processing system 16 is unable to operate for various reasons; thus, the bypass system 102 isolates the gas processing system 16 while allowing the exhaust gases 94 to be discharged through the exhaust stack 128. Various aspects of the bypass system 102 are described in further detail below.

[0049] 3 is a schematic diagram of an embodiment of the combined cycle power plant 10 of FIGS. 1 and 2 , further illustrating a lower-level bypass configuration 220 of the bypass system 102 coupled to the exhaust stack 128. In the illustrated embodiment, the bypass system 102 is coupled to a lower stack portion 222 of the exhaust stack 128, such as a ground level or base stack portion of the exhaust stack 128. The exhaust stack 128 also has an upper stack portion 224 that extends vertically upward above the bypass system 102 within the lower stack portion 222. Thus, the bypass flow path 132 extends through the upper stack portion 224 of the exhaust stack 128 to the exhaust outlet 134. The bypass system 102 may be supported by a support 226 having a plurality of legs 228, each of which includes one or more horizontal supports 230, one or more vertical supports 232, and one or more legs 234. As shown, legs 228 extend from opposite sides of bypass system 102, horizontal supports 230 extend outward from bypass system 102, and vertical supports 232 extend downward from horizontal supports 230 to respective legs 234, which may be located at ground level or fixed in place. Bypass system 102 may also include a framework or housing 236 coupled to supports 226, such that supports 226 and framework 236 hold bypass system 102 in a desired position within lower stack portion 222 of exhaust stack 128. Further details of bypass system 102 are described in greater detail below.

[0050] As further shown in FIG. 3 , HRSG 96 is coupled to lower stack portion 222 of exhaust stack 128 via transition duct 238, which may include an expansion joint 240 coupled to HRSG 96, an expansion joint 242 coupled to lower stack portion 222 of exhaust stack 128, and a lower transition portion 244 extending between and coupled to expansion joints 240 and 242. Transition duct 238 is sloped downward toward bypass system 102 disposed in lower stack portion 222. However, in certain embodiments, transition duct 238 may be oriented horizontally or upwardly sloped. Exhaust stack 128 is also coupled to gas processing system 16 via duct 246. Duct 246 may be oriented horizontally, upwardly sloped, or downwardly sloped between exhaust stack 128 and gas processing system 16. In the illustrated embodiment, duct 246 is generally horizontally oriented between expansion joint 248 coupled to lower stack portion 222 of exhaust stack 128 and expansion joint 250 coupled to gas processing system 16. Expansion joints 240, 242, 248, 250 may include various seals, movable connections, and flexible joints, thereby allowing movement between parts while maintaining a seal. For example, expansion joints 240, 242, 248, 250 may include hula seals, bellows, metal seals, axially movable joints, springs, or any combination thereof.

[0051] FIG. 4 is a schematic diagram of an embodiment of the combined cycle power plant 10 of FIGS. 1-3 , further illustrating an upper level bypass configuration 260 of the bypass system 102 coupled to the exhaust stack 128. The bypass system 102 is supported in a manner similar to that described above with reference to FIG. 3 . However, the bypass system 102 of the upper level bypass configuration 260 is supported by supports 226 within the upper stack portion 224 of the exhaust stack 128. Thus, the lower stack portion 222 of the exhaust stack 128 extends vertically upward from the HRSG 96 to the bypass system 102 within the upper stack portion 224 such that the exhaust gases 94 flow vertically upward before reaching the bypass system 102. The supports 226 have similar elements to those detailed above with reference to FIG. 3 . However, the legs 228 extend to the upper stack portion 224 such that the vertical supports 232 are generally longer than those shown in FIG. 3 . Otherwise, the support 226 has a similar structure of legs 228 including horizontal supports 230 , vertical supports 232 and legs 234 to support a framework or housing 236 of the bypass system 102 .

[0052] HRSG 96 is coupled to lower stack portion 222 via expansion joint 262, which may be similar to expansion joints 240, 242, 248, and 250 described above. Upper stack portion 224 of exhaust stack 128 is coupled to transition duct 264, which extends to gas processing system 16. Transition duct 264 includes expansion joint 266, which is coupled to upper stack portion 224 of exhaust stack 128 adjacent bypass system 102, and expansion joint 268, which is coupled to gas processing system 16. Again, expansion joints 266 and 268 may have a structure similar to expansion joints 240, 242, 248, and 250 described above. In the illustrated embodiment, transition duct 264 includes a lower transition portion 270, which extends from upper stack portion 224 to gas processing system 16. Thus, the downward transition portion 270 may include a downward slope from the upper level bypass configuration 260 of the bypass system 102 to the gas processing system 16. However, in certain embodiments, the downward transition portion 270 may include a vertical downward transition portion, a curved downward transition portion, a horizontal transition portion, or any combination thereof. In the upper level bypass configuration 260, the bypass system 102 is disposed in the upper stack portion 224, which may be at least 50, 60, 70, 80, or 90% or more of the overall height of the exhaust stack 128. The slope of the downward transition portion 270 may include an angle of at least 10, 20, 30, 40, 50, 60, or more degrees relative to the ground. Further details of the bypass system 102 are described in greater detail below.

[0053] 5 is a schematic diagram of an embodiment of the combined cycle power plant 10 of FIGS. 1-4 , further illustrating details of the bypass system 102 coupled to the exhaust stack 128 and the gas processing system 16. In the illustrated embodiment, the bypass system 102 is at least partially or substantially coupled to a duct 280 in the exhaust stack 128 and a duct 282 that extends to, or a portion of, the gas processing system 16. For example, the duct 280 may be a vertical duct in the exhaust stack 128, while the duct 282 may be a horizontal duct, a downwardly inclined duct, an upwardly inclined duct, or any combination thereof, between the duct 280 and the gas processing system 16. A diverter damper 140, a guillotine damper 142, and a seal gas system 144 may be coupled to one or both of the ducts 280 and 282 to provide flow control of the exhaust gas 94 to one or both of the gas processing flow path 130 and the bypass flow path 132.

[0054] In the illustrated embodiment, diverter damper 140 includes a door 284 coupled to a pivot joint 286 and a driver 288 configured to rotate door 284 about pivot joint 286 between a first position 290 and a second position 292. The first position 290 of door 284 blocks duct 280 and opens duct 282, thereby directing exhaust gases 94 through exhaust stack 128 and duct 282 along gas processing flow path 130 into and through gas processing system 16. In this first position 290, door 282 blocks exhaust gases 94 from continuing upward along bypass flow path 132 through exhaust stack 128 and out through outlet 134. In the second position 292, door 284 blocks duct 282 while opening exhaust stack 128 along duct 280 to out through outlet 134. Thus, second position 292 of door 284 allows exhaust gases 94 to flow upward through exhaust stack 128, along bypass flow path 132 through duct 280, and out through outlet 134. However, second position 292 of door 284 blocks duct 282, such that exhaust gases 94 cannot enter and pass through duct 282 along gas treatment flow path 130 into and through gas treatment system 16.

[0055] The diverter damper 140 can include various structures for the door 284, pivot joint 286, and driver 288. The door 284 can include a rotatable panel, plate, blade, slab, valve element, damper element, or combinations thereof. The door 284 can be constructed of metal, insulating material, or any combination thereof. The pivot joint 286 can include a hinge, shaft, pin, or any other suitable rotatable joint, allowing the door 284 to rotate between first and second positions 290 and 292, as indicated by arrow 294. The driver 288 can include an electric driver, a fluid driver, a gear assembly or transmission, or any combination thereof. For example, the driver 288 (e.g., an electric driver) can include an electric motor, an electric actuator, an electronic controller, or any combination thereof. The driver 288 (e.g., a fluid driver) can include a gas or pneumatic driver, a liquid or hydraulic driver, a gear assembly, a transmission, a fluid control device, or any combination thereof. For example, the driver 288 can include a fluid-driven piston-cylinder assembly that is driven by a fluid source to move a piston within a cylinder to provide the motion that drives the door 282. In certain embodiments, the driver 288 can include a gear assembly or transmission configured to convert linear motion to rotational motion (e.g., a linear-to-rotational conversion assembly), thereby providing the rotational motion of the door 284 between the first and second positions 290 and 292.

[0056] The guillotine damper 142 may include a gate 296 coupled to a driver 298 configured to move the gate 296 along a linear path of movement, as indicated by arrow 300, between an open position 302 disposed outside the duct 282 and a closed position 304 extending across the interior of the duct 282. In the open position 302, the gate 296 is retracted outside the duct 282, such that the gate 296 does not obstruct the flow of exhaust gases 94 along the gas processing flowpath 130. In the closed position 304, the gate 296 extends across the interior of the duct 282, such that the gate 296 blocks the flow of exhaust gases 94 entering and passing through the duct 282 along the gas processing flowpath 130 to the gas processing system 16. The driver 298 may include any and all of the features described above with reference to the driver 288. The driver 298 may include an electric driver, a fluid driver, a gear assembly or transmission, or any combination thereof. For example, the drive device 298 (e.g., an electric drive device) can include an electric motor, an electric actuator, an electronic controller, or any combination thereof. The drive device 298 (e.g., a fluid drive device) can include a gas or pneumatic drive device, a liquid or hydraulic drive device, a gear assembly, a transmission, a fluid controller, or any combination thereof. For example, the drive device 298 can include a fluid-driven piston-cylinder assembly that is driven by a fluid source to move a piston within a cylinder to provide the motion that drives the gate 296. The drive device 298 is configured to provide a linear force to move the gate 296 along a linear path of travel, as indicated by arrow 300. The guillotine damper 142 can operate to complement the diverter damper 140 when sealing the duct 282 in a bypass configuration (e.g., bypass mode) of the bypass system 102.

[0057] The seal gas system 144 may be coupled to the bypass system 102 at the diverter damper 140 and the guillotine damper 142 to facilitate sealing at various positions of the diverter damper 140 and the guillotine damper 142. For example, the seal gas supply 144 may include multiple seal gas injectors 306, such as a seal gas injector 308 coupled to the duct 280 adjacent the door 284 in the first position 290, a seal gas injector 310 coupled to the duct 282 adjacent the door 284 in the second position 292, and a seal gas injector 312 coupled to the duct 282 adjacent the gate 296 in the closed position 304 of the guillotine damper 142. The seal gas injectors 306, including the seal gas injectors 308, 310, and 312, may be coupled to the seal gas system 144 via a gas supply circuit 314. The gas supply circuit 314 may include gas supply conduits 316, 318, 320 coupled to the sealing gas injectors 308, 310, 312, respectively. Each of the sealing gas injectors 306 is configured to inject sealing gas from the sealing gas system 144 into a sealing area to facilitate sealing and prevent leakage of exhaust gas 94 and / or undesirable gases (e.g., CO) from the ducts 280 and 282. For example, the sealing gas supplied through the sealing gas injector 308 is configured to help seal and prevent leakage of the door 284 in the first position 290, the sealing gas injector 310 uses the sealing gas to help seal the door 284 in the second position 292, and the sealing gas injector 312 uses the sealing gas to help seal the gate 296 in the closed position 304 within the duct 282.

[0058] The seal gas system 144 may include multiple seal components 322, such as a seal gas source 324, one or more filters 326, one or more flow inducers 328, a distribution manifold 330, and one or more valves 332. As described in further detail below, the seal gas source 324 may include one or more storage tanks or containers of a seal gas, such as air, an inert gas (e.g., nitrogen), or another suitable gas compatible with flow through the exhaust stack 128 and the gas processing system 16. The filter 326 may include a cartridge filter, one or more screen filters, a particle separator, a water separator, a particulate media separator or filter, or any combination thereof. The flow inducer 328 may include one or more compressors, fans (e.g., electric motor-driven fans), blowers (e.g., electric motor-driven blowers), or any combination thereof. For example, the one or more compressors may include a rotary compressor or a reciprocating compressor, and the compressor may include one or more compression stages, an intercooler, or any combination thereof. In certain embodiments, the flow inducer 328 may include any flow control configured to induce flow of the sealing gas source 324. The distribution manifold 330 may include an inlet and multiple outlets configured to distribute the sealing gas through the gas supply circuit 314.

[0059] The controller 76 is communicatively coupled to the gas processing system 16 and the bypass system 102 to facilitate control of the position of the diverter damper 140, the position of the guillotine damper 142, and the sealing provided by the seal gas system 144. For example, the controller 76 may determine when to bypass the exhaust gas flow along the bypass flowpath 132 or direct the exhaust gas 94 along the gas processing flowpath 130 in response to one or more inputs. The one or more inputs may indicate a malfunction, a performance issue, a start-up condition, a low load condition, or any combination thereof that affects the effective operation of the gas processing system having the gas capture system. The one or more inputs may be received as sensor feedback from the sensors 86, user input via a computer or user interface, a condition of the combined cycle power plant 10 (e.g., a start-up or low load condition), a malfunction or other issue in the gas processing system 16, or any combination thereof. In response to the input, controller 76 may be configured to move door 284 to a first position 290 and move gate 296 to an open position 302 by controlling drivers 288 and 298, respectively, to operate in a gas processing mode. In the gas processing mode, exhaust gases 94 can flow through gas processing flow path 130 for processing in gas processing system 16, while diverter damper 140 blocks flow along bypass flow path 132. Controller 76 may also control movement of door 284 to a second position 292 and movement of gate 296 to a closed position 304, thereby blocking duct 282 and opening duct 280, to operate in a bypass mode. In the bypass mode, exhaust gases 94 are blocked from passing through gas processing flow path 130 and generally bypass gas processing system 16 via flow upward through duct 280 along bypass flow path 130 where they are discharged through outlet 134. In certain embodiments, the guillotine damper 142 may be included or excluded depending on the sealing needs of the duct 282 .The guillotine damper 142 is configured to provide redundant sealing and sealing of the duct 282 in bypass mode, thereby assisting in isolating the gas processing system 16 from the exhaust stack 128 when the combined cycle power plant 10 is operated in bypass mode using the bypass flow path 132.

[0060] FIG. 6 is a schematic diagram of one embodiment of the seal gas system 144 of the combined cycle power plant 10 of FIGS. 1-5 , further illustrating details of the seal component 322, the seal gas injector 306, and a seal system 350 that uses a seal gas. In the illustrated embodiment, the seal system 350 is disposed between a wall 352 and the door 284 of the diverter damper 140, which may correspond to the first position 290 or the second position 292 of the door 284 described above with reference to FIG. 5 . However, the seal system 350 may also be used with the gate 296 of the guillotine damper 142. In the illustrated embodiment, the seal system 350 includes a staggered seal assembly 354 coupled to the door 284 and a staggered seal assembly 356 coupled to the wall 352. Staggered seal assembly 354 can include seal plates 358 and 360, where seal plates 358 and 360 are spaced apart from one another by a distance 362 and where seal plates 358 and 360 are offset relative to one another by a distance 364. Seal plate 358 further includes seal 366, and seal plate 360 ​​includes seal 368. Seals 366 and 368 are likewise separated and offset by distances 362 and 364.

[0061] Separate from door 284 having staggered seal assembly 354, wall 352 has staggered seal assembly 356. As shown, staggered seal assembly 356 includes seal plates 370 and 372, which, like staggered seal assembly 354, are generally separated by distance 362 and offset by distance 364. In certain embodiments, distances 362 and 364 for staggered seal assemblies 354 and 356 may be substantially the same (e.g., within 5, 10, 15, or 20% of each other). However, in certain embodiments, distances 362 and / or 366 may vary between staggered seal assemblies 354 and 356. As described above, door 284 is configured to rotate about pivot joint 286 between first position 290 and second position 292 along a rotational movement path indicated by arrow 294. When door 284 is generally closed in a particular position, staggered seal assemblies 354 and 356 of seal system 350 engage with one another to seal door 284 against wall 252. For example, seal plates 358 and 360 with respective seals 366 and 368 of staggered seal assembly 354 generally open and close relative to seal plates 370 and 372 of staggered seal assembly 356. When staggered seal assemblies 354 and 356 are closed relative to one another, a seal chamber 374 is formed between staggered seal assemblies 354 and 356. For example, seal chamber 374 may be enclosed by seal plates 358, 360, 370, and 372 and seals 366 and 368. The seal chamber and engagement of staggered seal assemblies 354 and 356 may extend around one or more sides of door 284, for example, one, two, three, or four sides of door 284.

[0062] The seal gas system 144 is configured to supply a seal gas into the seal chamber 374, thereby providing a positive pressure within the seal chamber 374 to help reduce leakage between opposing sides 376 and 378 of the door 284. The seal chamber 374 is configured to receive the seal gas from the seal gas system 144 via an injection nozzle 380 coupled to the seal gas injector 306. The injection nozzle 380 may include one or more openings, passages, or conduits that enter the seal chamber 374 through the wall 352. The seal gas injector 306 may include a buffer chamber 382 disposed within the enclosure 384, such that the buffer chamber 382 can help regulate and distribute the seal gas flowing through the seal gas injector 306 and into the seal chamber 374. The seal gas injector 306 is coupled to the seal gas system 144 via a gas supply circuit 314.

[0063] As described above, the seal gas system 144 includes multiple seal components 322, such as a seal gas source 324, a filter 326, a flow inducer 328 (e.g., a fan, blower, compressor, etc.), a distribution manifold 330, and a valve 332. For example, the valve 332 may include valves 386, 388, and 390 coupled to respective seal gas injectors 306 at various locations in the combined cycle power plant 10. For example, the valves 386, 388, and 390 may be coupled to respective conduits 316, 318, and 320 leading to the seal gas injectors 308, 310, and 312, as described above with reference to FIG. 5 . Other aspects of the seal gas system 144 are as described above.

[0064] The controller 76 is configured to control the seal component 322 of the seal gas system 144 based on feedback from one or more sensors 86. For example, one of the sensors 86 can be located within the seal chamber 374, thereby providing feedback regarding conditions (e.g., pressure, temperature, gas composition, etc.) within the seal chamber 374. The controller 76 may also be configured to receive feedback from sensors 86 located on opposing sides 376 and 378 of the door 284, thereby providing sensor feedback of conditions (e.g., pressure, temperature, gas composition, etc.) on the opposing sides 376 and 378 of the door 284. Thus, the controller 76 can receive sensor feedback regarding conditions in the seal chamber 374, sides 376, and sides 378 and compare the sensor feedback to control the injection of seal gas into the seal chamber 374. For example, if the pressure of the sealing gas in the seal chamber 374 is lower than the gas pressure on one or both of the sides 376 and 378, the controller 76 can control the sealing gas system 144 to apply a greater flow and / or pressure of sealing gas through the sealing gas injectors 306 and into the seal chamber 374 until the sealing gas pressure in the seal chamber 374 exceeds the corresponding pressure on the sides 376 and / or 378. The controller 76 can also control other aspects of the sealing gas system 144, such as which sealing gas injectors 306 require sealing gas pressure depending on the positions of the door 284 and gate 296. The sealing gas system 144 can help seal the diverter damper 140, thereby allowing the bypass system 102 to operate without additional dampers, valves, or flow controls (e.g., guillotine damper 142) for the exhaust gas 94.

[0065] Technical effects of the disclosed embodiments include systems and methods for bypassing the gas treatment system 16, including one or more gas capture systems 100, in response to various conditions within the combined cycle power plant 10. For example, the disclosed embodiments may operate the bypass system 102 to open or close the diverter damper 140 and the guillotine damper 142 to route the exhaust gas 94 along the gas treatment flow path 130 through the gas treatment system 16 or through the bypass flow path 132, which generally bypasses the gas treatment system 16. The bypass system 102 may also be coupled to or include a seal gas system 144 configured to provide a seal gas to help seal and block leakage flow within the diverter damper 140 and the guillotine damper 142. The disclosed embodiments may also be configured to operate the bypass system 102 in response to sensor feedback from the sensors 86, start-up or low load conditions of the combined cycle power plant 10, malfunctioning or problem components within the gas treatment system 16, user input, or any combination thereof. Therefore, if the gas processing system 16 is unavailable for any reason, the bypass system 102 operates to bypass the gas processing system 16 and route the exhaust gas 94 through the outlet 134 of the exhaust stack 128, allowing for continued use and operation of the combined cycle power plant 10.

[0066] The subject matter detailed above may be governed by one or more of the provisions set forth below.

[0067] In certain embodiments, the system includes a bypass system having a first valve, a first driver coupled to the first valve, and a controller coupled to the first driver. The controller is configured to operate the first driver to move the first valve between a first position and a second position. The first position of the first valve opens a gas processing flow path for exhaust gas flow from the gas turbine engine and closes a bypass flow path. The second position of the first valve closes the gas processing flow path and opens the bypass flow path for exhaust gas flow from the gas turbine engine. The gas processing flow path is configured to extend through a gas processing system having a gas capture system. The bypass flow path is configured to bypass the gas processing system having the gas capture system.

[0068] The system of the preceding clause, wherein the bypass system includes a diverter damper having a first valve coupled to a first drive, the first valve including a diverter blade configured to rotate about a pivot joint.

[0069] The system of any preceding clause, wherein the bypass system includes a second driver coupled to the second valve, and wherein the controller is configured to operate the second driver to move the second valve between an open position and a closed position, wherein the open position of the second valve opens the gas processing flow path and the closed position of the second valve closes the gas processing flow path.

[0070] The system of any preceding clause, wherein the bypass system includes a guillotine damper having a second valve coupled to a second drive device, the second valve including a guillotine blade configured to move along an axial path between an open position and the closed position.

[0071] The system of any preceding clause, wherein the controller is configured to operate the first driver to move the first valve from the first position to the second position in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, affecting effective operation of the gas treatment system having the gas capture system.

[0072] The system of any preceding clause, including a seal gas system coupled to the bypass system, the seal gas system configured to supply a seal gas to help prevent leakage at the first valve.

[0073] The system of any preceding clause, wherein the seal gas system includes a seal gas injector and one or more sensors for monitoring pressure at the first valve.

[0074] The system of any preceding clause, wherein the gas capture system is configured to remove and capture at least one undesirable gas from the exhaust gas stream, the at least one undesirable gas comprising one or more of carbon oxides (COX), nitrogen oxides (NOX), or sulfur oxides (SOX).

[0075] The system of any preceding clause, wherein the gas capture system is configured to remove and capture carbon dioxide (CO2) from the exhaust gas stream.

[0076] The system of any preceding clause, wherein the gas capture system includes at least one of an adsorbent-based gas capture system, a solvent-based gas capture system, or a combination thereof.

[0077] The system of any preceding clause including an exhaust stack, wherein the bypass system is coupled to the exhaust stack.

[0078] The system of any preceding clause wherein the bypass system is coupled to a lower stack portion of the exhaust stack.

[0079] A system of any preceding clause in which the bypass system is coupled to an upper stack portion of the exhaust stack.

[0080] The system of any preceding clause, comprising a gas treatment system having a gas capture system coupled to the exhaust stack along a gas treatment flow path.

[0081] The system of any preceding clause, including a heat recovery steam generator (HRSG) configured to provide an exhaust gas flow into the exhaust stack, a gas turbine engine configured to provide an exhaust gas flow into the HRSG, or a combination thereof.

[0082] In certain embodiments, the system includes a controller coupled to a bypass system having a first driver coupled to a first valve, the controller configured to operate the first driver to move the first valve between a first position and a second position. The first position of the first valve opens a gas processing flow path for exhaust gas flow from the gas turbine engine and closes a bypass flow path. The second position of the first valve closes the gas processing flow path and opens the bypass flow path for exhaust gas flow from the gas turbine engine. The gas processing flow path is configured to extend through the gas processing system having a gas capture system. The bypass flow path is configured to bypass the gas processing system having the gas capture system.

[0083] The system of the preceding paragraph, wherein the controller is configured to operate the first driver to move the first valve from the first position to the second position in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, affecting effective operation of the gas treatment system having the gas capture system.

[0084] The system of any preceding clause, wherein the gas capture system is configured to remove and capture carbon dioxide (CO2) from the exhaust gas stream.

[0085] In certain embodiments, a method includes controlling a first driver to move a first valve of a bypass system to a first position to open a gas processing flow path for exhaust gas flow from the gas turbine engine and close a bypass flow path, the gas processing flow path being configured to extend through the gas processing system having a gas capture system. The method also includes controlling the first driver to move the first valve of the bypass system to a second position to close the gas processing flow path for exhaust gas flow from the gas turbine engine and open a bypass flow path, the bypass flow path being configured to bypass the gas processing system having the gas capture system.

[0086] The method of the preceding paragraph, including controlling the first driver to move the first valve from a first position to a second position in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, affecting effective operation of the gas treatment system having the gas capture system, wherein the gas capture system is configured to remove and capture carbon oxides (CO2) from the exhaust gas stream.

[0087] This specification uses examples to describe the present embodiments, including the best mode. The examples also enable any person skilled in the art to practice the embodiments disclosed herein, including making and using any device or system, and performing any incorporated methods. The patentable scope of the embodiments disclosed herein is defined by the 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 that do not differ in material way from the literal language of the claims. [Explanation of symbols]

[0088] 10 Combined cycle power plants, gas turbine systems 12 Gas turbine engine 14 Control System 16 Gas treatment systems, bypass systems 18 Intake Section 20 Compressor Section 22 Combustor Section 24 Turbine Section 26 Load 28 Exhaust Section 30 Upstream inlet duct 32 Bellmouth 34 inner hub 36 Exterior Wall 38 Fixed vane 40 Inlet guide vane 42 Actuator 44 Compressor Stage 46 Compressor blade 48 Compressor shaft 50 Compressor casing 52 Compressor vane 54 Annular Combustor 56 Fuel nozzle 58 Compressed Air Flow 60 fuel 61 Fuel Processing System 62 Fuel supply system 63 Fuel Processing Components 64 Hot combustion gases 66 Turbine Stage 68 Turbine Blade 70 Turbine shaft 72 Turbine casing 74 Turbine vane 76 Controller 78 processors 80 memory 82 command 84 Communication Circuit 86 Sensor, Element No. 88 Arrow 90 shaft 92 Shaft 94 Exhaust gas, exhaust flow 96 Heat Recovery Steam Generator (HRSG) 98 Steam Turbine System 99 Cooler 100 Gas Capture System 102 Bypass System 104 Fluid Supply System 106 Fluid 108 Steam 110 Boiler 112 Treated Gas 114 Trapped Gas 116 Downstream equipment 120 load 122 Low Pressure (LP) Section 124 Medium Pressure (IP) Section 126 High Pressure (HP) Section 128 Exhaust Stack 130 Gas treatment flow path, bypass flow path, exhaust gas flow path 132 Bypass flow path, gas processing flow path 134 Discharge opening, discharge port 136 Discharge stream 138 Flow Control Components 140 Diverter damper 142 Guillotine Damper 144 Seal gas system, seal gas supply 145 Booster Fan 146 Sorbent-Based Gas Capture Systems 148 Solvent-based gas capture systems, solid-based gas capture systems 150 Adsorbent materials, gas capture components 152 Mode control device, gas trapping component 154 Gas Trapping Components 156 Coolers, Gas Capture Components 158 Absorbers, Gas Capture Components 160 Stripper 162 Dehydration System 164 Compression System 166 Storage and / or Pipeline Systems 168 Dehydration Components 170 Heat exchanger 172 Separator 174 Water Collector 176 Water Supply System 178 Dry Trapped Gas 180 Compressor components, compression components 182 Compressor 184 Compressor 186 Intercooler, cooling heat exchanger 188 Compressed trapped gas 190 Arrow 192 Arrow 194 Arrow 196 Water Components 198 Water storage 200 Thermal Control System 202 Water Treatment System 220 Lower Level Bypass Configuration 222 Lower stack part 224 Upper stack part 226 Support 228 Legs 230 Horizontal support 232 Vertical support 234 legs 236 Framework, Housing 238 Transition Duct 240 Expansion Joint 242 Expansion Joint 244 Downward transition part 246 Duct 248 Expansion Joint 250 Expansion Joint 252 Wall 260 Upper Level Bypass Configuration 262 Expansion Joint 264 Transition Duct 266 Expansion Joint 268 Expansion Joint 270 Downward transition part 280 Duct 282 Ducts, Doors 284 doors 286 Pivot Joint 288 Drive Unit 290 First Position 292 Second Position 294 Arrow Gate 296 298 Drive Unit 300 Arrows 302 open position 304 Closed position 306 Seal gas injector, seal gas injection 308 Seal Gas Injector 310 Seal Gas Injector 312 Seal Gas Injector 314 Gas supply circuit 316 Gas supply pipes 318 Gas supply pipes 320 Gas supply pipes 322 Seal Components 324 Seal Gas Source 326 filters 328 Flow Inducer 330 Distribution Manifold 332 Valve 350 Seal System 352 Wall 354 Staggered Seal Assembly 356 Staggered Seal Assembly 358 Seal Plate 360 Seal Plate 362 distance 364 distance 366 stickers 368 stickers 370 Seal Plate 372 Seal Plate 374 Seal Chamber 376 Side 378 Side 380 Injection Nozzle 382 Buffer Chamber 384 Enclosure 386 Valve 388 Valve 390 Valves

Claims

1. A first valve, a first driver coupled to the first valve; and a controller (76) coupled to the first drive device, the controller (76) configured to operate the first drive device to move the first valve between a first position (290) and a second position (292), the first position (290) of the first valve opening a gas processing flow path (130) and closing a bypass flow path (132) for the flow of exhaust gas (94) from the gas turbine engine (12), the second position (292) of the first valve closing the gas processing flow path (130) and opening the bypass flow path (132) for the flow of exhaust gas (94) from the gas turbine engine (12), the gas processing flow path (130) configured to extend through a gas processing system (16) having a gas capture system (100), and the bypass flow path (132) configured to bypass the gas processing system (16) having the gas capture system (100). A bypass system (102) including A system including:

2. 2. The system of claim 1, wherein the bypass system includes a diverter damper having the first valve coupled to the first drive, the first valve including a diverter blade configured to rotate about a pivot joint.

3. 2. The system of claim 1, wherein the bypass system includes a second driver coupled to a second valve, and the controller is configured to operate the second driver to move the second valve between an open position and a closed position, the open position of the second valve opening the gas processing flow path and the closed position of the second valve closing the gas processing flow path.

4. 4. The system of claim 3, wherein the bypass system includes a guillotine damper having the second valve coupled to the second drive device, the second valve including a guillotine blade configured to move along an axial path between the open position and the closed position.

5. 2. The system of claim 1, wherein the controller (76) is configured to operate the first driver to move the first valve from the first position (290) to the second position (292) in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, that affect effective operation of the gas processing system (16) having the gas capture system (100).

6. 2. The system of claim 1, including a seal gas system coupled to the bypass system, the seal gas system configured to supply a seal gas to help prevent leakage at the first valve.

7. The system of claim 6, wherein the seal gas system (144) includes a seal gas injector and one or more sensors (86) for monitoring pressure at the first valve.

8. The gas capture system (100) is configured to remove and capture at least one undesirable gas from the exhaust gas (94) stream, the at least one undesirable gas being carbon oxides (CO Ｘ ), nitrogen oxides (NO Ｘ ), or sulfur oxides (SO Ｘ 10. The system of claim 1, comprising one or more of:

9. The gas capture system (100) extracts carbon dioxide (CO ) from the exhaust gas (94) stream. ２ 10. The system of claim 1, configured to remove and capture

10. The system of claim 1 , wherein the gas capture system (100) comprises at least one of a sorbent-based gas capture system (146), a solvent-based gas capture system (148), or a combination thereof.

11. The system of any preceding claim, including an exhaust stack (128), the bypass system (102) coupled to the exhaust stack (128).

12. The system of claim 11, wherein the bypass system (102) is coupled to a lower stack portion (222) of the exhaust stack (128).

13. The system of claim 11, wherein the bypass system (102) is coupled to an upper stack portion (224) of the exhaust stack (128).

14. The system of claim 11, comprising the gas processing system (16) having the gas capture system (100) coupled to the exhaust stack (128) along the gas processing flow path (130).

15. 12. The system of claim 11, comprising a heat recovery steam generator (HRSG) configured to supply the exhaust gas flow into the exhaust stack, the gas turbine engine configured to supply the exhaust gas flow into the HRSG, or a combination thereof.

16. a controller (76) coupled to a bypass system (102) having a first driver coupled to a first valve, the controller (76) configured to operate the first driver to move the first valve between a first position (290) and a second position (292), the first position (290) of the first valve opening a gas processing flow path (130) and closing a bypass flow path (132) for exhaust gas (94) flow from a gas turbine engine (12); the second position (292) of the controller (76) closes the gas processing flow path (130) and opens the bypass flow path (132) for the flow of exhaust gas (94) from the gas turbine engine (12), the gas processing flow path (130) is configured to extend through a gas processing system (16) having a gas capture system (100), and the bypass flow path (132) is configured to bypass the gas processing system (16) having the gas capture system (100). A system including:

17. 17. The system of claim 16, wherein the controller (76) is configured to operate the first driver to move the first valve from the first position (290) to the second position (292) in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, that affect effective operation of the gas processing system (16) having the gas capture system (100).

18. The gas capture system (100) extracts carbon dioxide (CO ) from the exhaust gas (94) stream. ２ 17. The system of claim 16, configured to remove and capture

19. controlling a first driver to move a first valve of a bypass system to a first position to open a gas processing flow path and close a bypass flow path for exhaust gas flow from a gas turbine engine, the gas processing flow path being configured to extend through a gas processing system having a gas capture system; controlling the first driver to move the first valve of the bypass system to a second position to close the gas processing flow path and open the bypass flow path for the exhaust gas flow from the gas turbine engine, the bypass flow path being configured to bypass the gas processing system having the gas capture system; A method comprising:

20. and controlling the first driver to move the first valve from the first position (290) to the second position (292) in response to one or more inputs indicative of a malfunction, a performance problem, a start-up condition, a low load condition, or any combination thereof, affecting effective operation of the gas treatment system (16) having the gas capture system (100), wherein the gas capture system (100) extracts carbon dioxide (CO ) from the exhaust gas (94) stream. ２ 20. The method of claim 19, configured to remove and capture

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