JP2020512498A - System to reduce start-up emissions of power plants including gas turbines - Google Patents

Abstract

Disclosed are embodiments of emission reduction systems that include various embodiments of emission filters for power plants that include gas turbines. The system includes an exhaust filter and a retraction system operably coupled to an exhaust passage of a gas turbine. The exhaust passage defines an exhaust path for exhaust gas from the gas turbine. The retraction system selectively moves the exhaust filter between a first position within the exhaust path and a second position outside the exhaust path. In a combined cycle power plant, the first location is upstream of the heat recovery steam generator (HRSG). The described system and filter allows temporary placement of the exhaust filter immediately downstream of the gas turbine exhaust outlet or upstream of the HRSG for reduced emissions at low load or start-up conditions, and at higher loads. Provide an emission reduction system and filter that removes the emission filter when moved to. [Selection diagram] Fig. 5

Description

  The present disclosure relates generally to power plants, and more specifically to systems for reducing start-up emissions in power plants including gas turbines.

  Gas turbine systems are widely used for power generation. Combined cycle power plants use gas turbine systems and steam turbine systems to generate electricity. As gas turbine systems and combined cycle power plants have advanced, the power plants that use the systems have increased the operational demands placed on them. In particular, power plants need to continue operating at a larger load spectrum while meeting environmental regulations. One challenge with the operation of gas turbine systems is meeting environmental regulations, such as nitrogen dioxide (NOx) and / or carbon monoxide (CO) limits, during low load operation, such as during system startup. For example, some environmental regulations require NOx emissions to be limited to 19 kilograms / hour during start-up emissions, which is becoming increasingly difficult with large gas turbine systems. During operation of a gas turbine system, many operating characteristics result in high NOx and CO emissions. For example, in a combined cycle power plant, the exhaust gas of the gas turbine system may reach about 370 ° C. (load of about 5 to 20%) at the time of starting, so that the heat recovery steam generator (HRSG) is warmed up (conventional). Thermal stress relaxation), steam temperature adaptation at steam turbine system startup, reheating pressure drop at steam turbine system startup (HP turbine section), gas turbine system fuel heating.

During normal high load operation, emissions from gas turbine systems are typically controlled by two emission control systems. Initially, selective catalytic reduction (SCR) system, reducing agent emissions, e.g. anhydrous ammonia, by reaction with aqueous ammonia or urea to convert the NOx nitrogen, water and carbon dioxide (CO _2). The exhaust may then be passed through a CO catalyst system to remove CO. However, in the low load condition of a combined cycle power plant, for example, the SCR system and the CO catalyst system are placed after a heat exchanger capable of producing the required heat, such as a superheater in the HRSG or a high pressure (HP) drum. The SCR system and the CO catalyst system do not operate because the desired operating temperature is not reached. For example, at startup, it may take 30 minutes or more for a conventional emission control system to reach a sufficient operating temperature to begin reducing NOx and CO emissions. In this case, the exhaust is discharged from the HRSG to the atmosphere without emission control. During this initial period, the power plant may continue to emit NOx and CO emissions, which are counted in the government issued start-up and annual gross tonnage permit limits. This problem may limit the operability of the power plant, such as the number of start-ups per year and the total operating time. Additional CO catalysts are placed upstream of the superheater to address CO emissions, but such a structure imposes additional restrictions on the power plant during full load operation. In another approach, the load on the gas turbine system rises rapidly from start-up to a point of low emissions (called "quick response"). However, this approach adds more equipment and complex control systems to the plant.

U.S. Patent Application Publication No. 2015-0204241

  A first aspect of the present disclosure provides an emission abatement system for a power plant that includes a gas turbine, the system including an exhaust filter and a retraction system operably coupled to an exhaust passage of the gas turbine, the exhaust passage comprising: Defines an exhaust path for exhaust from the gas turbine, and the intake system selectively moves the exhaust filter between a first position within the exhaust path and a second position outside the exhaust path.

  A second aspect of the present disclosure provides a method of reducing emissions in a power plant that includes a gas turbine, the method being operably coupled to a retraction system operably coupled to an exhaust passage of the gas turbine. An exhaust filter is provided, the exhaust passage defines an exhaust path for the exhaust from the gas turbine, and a retraction system is used to provide a first exhaust path in the exhaust path depending on the exhaust conditions of the exhaust from the gas turbine. Selectively moving the exhaust filter between a position and a second position outside the exhaust path.

  A third aspect of the present disclosure provides an emission reduction system for a power plant that includes a gas turbine, the system being an exhaust filter that includes a first panel and a second panel, each panel being an exhaust of the gas turbine. An exhaust filter including an open structural frame having a filter medium through which the exhaust gas passes to remove exhaust components of the exhaust gas; and a retraction system operably coupled to an exhaust passage of the gas turbine, the exhaust passage comprising the gas turbine. An exhaust path for the exhaust from the exhaust system and the retraction system selectively selects each of the first panel and the second panel within the exhaust passage between a first position within the exhaust path and a second position outside the exhaust path. To move laterally.

  A fourth aspect of the present disclosure provides an emission reduction system for a power plant including a gas turbine, the system having an open structure having a filter medium through which the exhaust gas passes to remove exhaust components of the gas turbine exhaust gas. An exhaust filter including a frame and a retraction system operably coupled to an exhaust passage of the gas turbine, the exhaust passage defining an exhaust path for exhaust matter from the gas turbine, the retraction system defining an exhaust in the exhaust passage. The exhaust filter is selectively moved longitudinally through an opening in the upper wall of the exhaust passage between a first position in the passage and a second position outside the exhaust passage.

A fifth aspect of the present disclosure provides an emission reduction system for a power plant that includes a gas turbine, the system including a carbon monoxide (CO) catalyst through which the exhaust gas passes to remove carbon monoxide from the exhaust gas. A CO catalytic filter, wherein the CO catalytic filter is disposed upstream of a heat recovery steam generator (HRSG) operably coupled to an exhaust passage of a gas turbine for producing steam for the steam turbine. And a retraction system operably coupled to an exhaust passage of the gas turbine, the exhaust passage defining an exhaust path for exhaust matter from the gas turbine, the retraction system including a first system within the exhaust path within the exhaust path. A retraction system for selectively moving the CO catalytic filter between the position and a second position outside the exhaust path.

  A sixth aspect of the present disclosure provides an exhaust filter for a power plant that includes a gas turbine, the exhaust filter comprising a series of pivotally coupled panels, each panel comprising an exhaust of a gas turbine exhaust. It includes an open structural frame having a filter medium through which the exhaust gas passes to remove components.

A seventh aspect of the present disclosure provides an emission reduction system for a power plant that includes a gas turbine, the system being an emission filter that includes a series of pivotally coupled panels, each panel being an exhaust product. And a retraction system operably coupled to an exhaust passage of a gas turbine, the exhaust filter including an open structural frame having a filter media therethrough and a pair of opposed bearings extending from opposite ends of the panel. And the exhaust passage defines an exhaust path for the exhaust from the gas turbine and the retraction system selectively moves the exhaust filter between a first position within the exhaust path and a second position outside the exhaust path. Includes retraction system.

  Example aspects of the disclosure are designed to solve the problems herein described and / or other problems not discussed.

  These and other features of the present disclosure will be more readily understood from the following detailed description of various aspects of the present disclosure, in conjunction with the accompanying drawings showing various embodiments of the present disclosure.

1 shows a schematic diagram of an exemplary conventional combined cycle power plant. 1 shows a cross-sectional view of an exemplary conventional gas turbine system. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 6 shows a perspective view of an exhaust filter and retraction system according to one embodiment of the present disclosure. FIG. 6 shows a perspective view of an exhaust filter and retraction system according to another embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 6 illustrates a cross-sectional view of a portion of an emission reduction system according to another embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 3 shows a schematic perspective view of a portion of an emission reduction system according to an embodiment of the present disclosure. FIG. 3 shows a schematic perspective view of a portion of an emission reduction system according to an embodiment of the present disclosure. FIG. 3 shows a schematic perspective view of a portion of an emission reduction system according to an embodiment of the present disclosure. FIG. 6 shows a perspective view of a retraction system according to one embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 6 shows a cross-sectional view of a retraction system according to one embodiment of the present disclosure. FIG. 6A shows a cross-sectional view of a retraction system according to another embodiment of the present disclosure. FIG. 5 shows a cross-sectional view of a portion of an emission reduction system according to one embodiment of the present disclosure. FIG. 6 illustrates a cross-sectional view of a portion of an emission reduction system according to another embodiment of the present disclosure.

  Note that the drawings in this disclosure are not to scale. The drawings are intended to depict only typical aspects of the disclosure, and therefore should not be considered as limiting the scope of the disclosure. In the drawings, like numbering represents like elements between the drawings.

As a first issue, when describing with reference to relevant mechanical components within combined cycle power plants, gas turbine systems and / or heat recovery steam generators, in order to clarify the present disclosure, certain specific components are described. It is necessary to select a technical term. When doing this, wherever possible, common industry terminology is used and utilized in the same sense as its accepted meaning. Unless otherwise stated, such terminology should be given a broad interpretation consistent with the context of the application and the appended claims. One of ordinary skill in the art will appreciate that in many cases a particular component can be referred to using a number of different or overlapping terms. What may be described herein as a single piece includes and may be referenced in another context as being composed of multiple components. Alternatively, what may be described herein as including multiple components may be referenced elsewhere as a single piece.

Moreover, some descriptive terms may be used herein in a routine manner, and it may prove useful to define these terms at the beginning of this section. Unless otherwise noted, these terms and their definitions are as follows. As used herein, "downstream" and "upstream" are terms that indicate the direction of flow of a fluid, such as a working fluid, through a turbine engine, eg, exhaust flow through a heat recovery steam generator . The term "downstream" corresponds to the direction of fluid flow and the term "upstream" refers to the opposite direction of flow. The terms "forward" and "rearward" refer to direction unless otherwise specified, "forward" refers to the front of the engine or the compressor end, and "rear" to the rear of the engine or turbine end or exhaust path. HRSG end. The term "axial" refers to movement or position parallel to the axis.

  The present disclosure allows temporary placement of an exhaust filter immediately downstream of the gas turbine exhaust outlet or upstream of the HRSG for reduced emissions at low load or start-up conditions, and exhaust conditions such as higher loads. Provided are emission abatement systems and filters that remove the emission filters from the exhaust path when changed by moving motion. For purposes of explanation, emissions reduction system and filter embodiments are described with respect to combined cycle power plants. Obviously, the teachings of the present disclosure are applicable to any combustion system, such as a gas turbine system.

Referring to FIG. 1, a schematic diagram of portions of an exemplary conventional combined cycle power plant 10 is shown. In this example, the power generation system is a single shaft system with two generators, but one of ordinary skill in the art will readily appreciate that the teachings of the present disclosure are applicable to any of a variety of combined cycle power plants. You will understand. The combined cycle power plant 10 may include a gas turbine system 12 operably connected to a generator 14 and a steam turbine system 16 operably coupled to another generator 18. The generator 14 and the gas turbine system 12 may be mechanically coupled by a shaft 20, which transfers energy between a drive shaft (not shown) of the gas turbine system 12 and the generator 14. be able to. Also, as shown in FIG. 1, a heat recovery steam generator (HRSG) 22 is operably connected to the gas turbine system 12 and the steam turbine system 16. The HRSG 22 may be fluidly connected to both the gas turbine system 12 and the steam turbine system 16 via conventional conduits (not shown). It is understood that the generators 14, 18 and shaft 20 may be of any size or type known in the art and may vary depending on their application or the system to which they are connected. . The common designation of generator and shaft is for clarity and does not necessarily imply that these generators or shafts are the same.

  As shown in the cross-sectional view of FIG. 2, conventional gas turbine system 12 may include a compressor 30 and a combustor 32. The combustor 32 includes a combustion region 34 and a fuel nozzle assembly 36. The gas turbine system 12 also includes a gas turbine 38 coupled to the common compressor / turbine shaft 20. In one embodiment, the gas turbine system 12 is a MS7001FB engine, sometimes referred to as a 9FB engine, commercially available from General Electric Company of Greenville, SC. The present disclosure is not limited to any particular gas turbine system and may be implemented in connection with other engines. During operation, air enters the inlet of compressor 30 and is compressed and discharged to combustor 32 where heated gas, eg, natural gas, or fuel, such as fluid, eg, oil, is combusted according to embodiments of the present disclosure. Is provided to provide the high energy combustion gases that drive the gas turbine 38. In the gas turbine 38, the energy of the hot gas is converted to work, some of which is used to drive the compressor 30 via the rotating shaft 20 and the rest of the load, such as the generator 14 to produce electricity. Can be used for useful work in driving the shaft 20 through the shaft 20.

  Returning to FIG. 1, the energy in the exhaust gas (dashed line) exiting the gas turbine system 12 is converted to additional useful work. The exhaust gas flows into the HRSG 22 (heat exchanger), where water is converted to steam like a boiler. Within the HRSG 22, a steam turbine system 16, for example its high pressure (HP) turbine, may be preceded by a superheater 24 that superheats the steam using exhaust and / or another heat source. Steam turbine system 16 may include one or more steam turbines, such as a high pressure (HP) turbine, an intermediate pressure (IP) turbine, and a low pressure (LP) turbine, each coupled to shaft 20. Each steam turbine includes a plurality of rotating blades (not shown) mechanically coupled to shaft 20. In operation, steam from various portions of HRSG 22 enters the inlet of at least one steam turbine and is directed to force its blades to rotate shaft 20. As will be appreciated, steam from the upstream turbine can be later used in the downstream turbine. The steam thus produced by the HRSG 22 drives at least a portion of the steam turbine system 16 and additional work is extracted to drive the shaft 20, which is then loaded by additional load, such as the second generator 18, with additional power. To generate. A conventional power plant control system 26 can control the above components.

  As mentioned above, with the progress of combined cycle power plants, operational requirements for the entire system have increased. In particular, combined cycle power plants must continue to operate over a larger load spectrum while meeting environmental regulations, which poses one challenge for the operation of gas turbine systems, including low load operation such as at system start-up. Among other things, meeting environmental regulations such as nitrogen dioxide (NOx) and / or carbon monoxide (CO) limits. In particular, during start-up of gas turbine systems, many operating characteristics generate relatively high NOx and CO emissions. In one example, the exhaust gas of the gas turbine system may be about 370 ° C. (load of about 5 to 20%) at the start, so that the HRSG warm-up operation (conventional thermal stress relaxation) and the steam turbine system start-up may be performed. It may allow matching of steam temperature to ideal, reheat pressure drop at steam turbine system startup (HP turbine section), gas turbine system fuel heating.

  During normal high load operation, emissions are typically controlled in gas turbine systems by two emission control systems. Initially, the exhaust may be passed through a CO catalyst system 40 in the HRSG 22 to remove CO, as shown in the prior art system of FIG. The selective catalytic reduction (SCR) system 42 in the HRSG 22 then converts NOx to nitrogen and water by reacting the exhaust (dashed line) with a reducing agent such as anhydrous ammonia, aqueous ammonia or urea. The systems 40 and 42 may be interspersed within various heat transfer piping sets of the HRSG 22. In low load conditions, the SCR system 42 and the CO catalyst system 40 do not operate because they are located, for example, after the superheater 24 (FIG. 1) or HP drum (not shown) and do not reach the desired operating temperature. For example, at startup, it may take 30 minutes or more for the conventional systems 40, 42 to reach sufficient operating temperatures to begin reducing NOx and CO emissions. In this case, the exhaust may be released into the atmosphere from the HRSG 22 (dotted line) without emission control. During this initial period, the power plant 10 may continue to emit NOx and CO emissions, which are counted at start-up and annual gross tonnage limits.

  Embodiments of the present disclosure provide an emission reduction system and method that uses an emission filter immediately upstream of all HRSGs immediately after the gas turbine system. The emission reduction system uses a retraction system to selectively move the emission filter from a first position within the exhaust path and a second position outside the exhaust path. Thus, the exhaust filter can be used in a first position upstream of the HRSG, which reaches a temperature sufficient to use the exhaust filter at start-up or other low load conditions, when the temperature is too high and the exhaust filter is too hot. Can be withdrawn from the exhaust path while its use can result in undesirable exhaust flow restriction. Although the teachings of the present disclosure are described as applied to combined cycle power plants, they may be applicable only to gas turbine systems.

  FIG. 3 illustrates a cross-sectional view of a portion of combined cycle power plant 110 that includes gas turbine system 112 operably coupled to HRSG 122, according to one embodiment. As described herein, the gas turbine system 112 can include any combustion-based turbine system. The gas turbine system 112 may also include a conventional duct burner 114 downstream of its turbine 116, which combusts residual fuel in the exhaust 118 exiting the turbine 116. As will be appreciated, exhaust 118 includes various combustion exhaust gases such as carbon dioxide, carbon monoxide (CO), nitrogen oxides (NOx). The exhaust 118 is operably coupled to the gas turbine 116 and passes through an exhaust passage 120 configured to direct the exhaust 118 downstream of the gas turbine 116, eg, to the HRSG 122. Exhaust passage 120 may be an integral part of HRSG 122, or it may be a separate passage upstream but operably coupled to HRSG 122. In any case, exhaust passage 120 defines an exhaust path through which exhaust 118 must pass.

  As will be appreciated, the HRSG 122 is operably coupled to the exhaust passage 120 of the gas turbine 116 to produce steam for the steam turbine 124 (shown schematically in phantom in FIG. 3). The HRSG 122 may include currently known or later developed steam generating heat exchangers. As is understood in the art, the HRSG 122 can include multiple sets of heating pipes 150 through which water and / or steam passes to form steam, or to further heat steam. For example, the HRSG 122 functions as a conventional component of the HRSG such as, but not limited to, a superheater for any number of steam turbine stages (ie, HP, IP and / or LP), economizers and reheat sections. A set of pipes 150 can be included. Any conventional steam or boiler drum (not shown) may also be provided for HRSG 122. The HRSG 122 may also include the necessary plumbing or valves (not shown) to deliver water / steam as needed. The HRSG 122 may also include bypass systems, valves and desuperheaters that operate in a fast response mode.

The HRSG 122 may also include a conventional carbon monoxide (CO) catalytic filter 152 downstream of the first set of heat exchange pipes 150A. The CO catalytic filter 152 can perform the desired catalytic conversion of CO to carbon dioxide (CO ₂ ) or other less toxic pollutants in a conventional manner, now known or later developed. A CO catalyst material can be included. The HRSG 122 can also include a conventional selective catalytic reduction (SCR) system 154. As understood in the art, the SCR system 154 converts NOx to nitrogen, water and carbon dioxide by reacting the exhaust with a reducing agent such as anhydrous ammonia, aqueous ammonia or urea. The SCR system 154 may include a conventional SCR filter 160 and an SCR reductant injector 162 (eg, ammonia injection grid (AIG)) upstream of the filter 160. The SCR filter 160 may include, for example, a metal oxide or zeolite based porous catalyst (eg, V205 / TiO ₂ ). The HRSG 122 can also have a composite SCR-CO catalyst instead of two separate catalysts. The SCR reductant injector 162 can include presently known or later developed injector systems such as an array of nozzles, atomizers, etc. that can coat the SCR filter 160 with a reductant. The SCR reductant injector 162 includes, for example, a reductant reservoir 166, a reductant pump 168, a control valve 170, an evaporator 172, a heater 174 and an air compressor 176 for delivery of an air stream to entrain the reductant. It may be coupled to any form of reducing agent delivery system 164. Any power plant controller 180 now known or later developed may be used to control the aforementioned components.

  FIG. 3 also illustrates an emission reduction system 200 (hereinafter “ER system 200”) for a power plant 110 according to an embodiment of the disclosure. The ER system 200 includes an exhaust filter 202 and a retraction system 204. As used herein, "exhaust filter" refers to all or part of an exhaust toxin removal or reduction system in any form. As described below, the exhaust filter removes various forms of toxins and can assume various structural forms.

As shown in FIG. 3, in one embodiment, the exhaust filter 202 takes the form of the SCR filter 206 of the SCR system 210 sized for the first position 212 within the exhaust passage 120. More specifically, the exhaust filter 202 can include any currently known or later developed filter media used in SCRs. For example, SCR filter 206 may include a metal oxide or zeolite based porous catalyst (eg, V205 / TiO ₂ ). As shown, the first position 212 is upstream of the HRSG 122 and the exhaust filter 202 (SCR filter 206) spans the exhaust passage 120 and thus the exhaust path. The exhaust filter 202 may be smaller than the conventional SCR filter 160 in the HRSG 122 due to the size of the exhaust passage 120 immediately downstream of the gas turbine 116 compared to the HRSG 122. In this embodiment, the SCR system 210 can also include an SCR reductant injector 220, which is now known or hereafter, such as an array of nozzles, atomizers, etc. that can coat the SCR filter 216 with reductant. It may include any injector system developed. As shown, the SCR reductant injector 220 is upstream of the first location 212 in the exhaust passage. In one embodiment, the SCR reductant injector 220 may be permanently mounted within the exhaust passage 120 and includes, for example, metal piping and nozzles that can withstand the higher load temperatures of the gas turbine 116. The SCR reductant injector 220 can be coupled to any form of reductant delivery system. In the example shown, the SCR reductant injector 220 is provided as an add-on device to the reductant delivery system 164. In this case, the SCR reductant injector 220 is operably coupled to the reductant delivery system 164 via, for example, valve 222 and conduit (unnumbered). As described, the reductant delivery system 164 includes a reductant reservoir 166, a reductant pump 168, a control valve 170, an evaporator 172, a heater 174, and an air compressor 176 that delivers an air stream entrained with the reductant. In an alternative embodiment, the SCR reductant injector 220 may be coupled to its own independent smaller reductant delivery system, which is configured similar to system 164 without coupling to components within the HRSG 122. . In any event, as described further herein, the controller 180 modifies to control the valve 222 that delivers the reducing agent to the injector 220, for example, via modification of hardware and / or software. be able to. During operation, the reducing agent is injected into the SCR filter 206 and the exhaust 118 passes through the SCR filter. As the exhaust 118 passes, NOx reacts with the reducing agent, reducing NOx to nitrogen, water and carbon dioxide, which are then either vented to the atmosphere or conventionally recovered downstream of the ER system 200. May be used for.

  The ER system 200 may also include a shunt 224 in front of the exhaust filter 202 to properly divert the exhaust stream to avoid bypassing the exhaust stream, which bypasses the flow entering the ER system 200. It may be a challenge during start-up or low load conditions as it is about 5-20% of the design flow and the exhaust velocity profile may not be uniform. The flow diverter 224 can include a perforated disc or some other design to properly and evenly distribute the flow. Such a shunt 224 is shown only in connection with FIG. 3 for clarity, but may be part of any of the ER system configurations described herein.

In another embodiment, shown in FIG. 4, the exhaust filter 202 is in the form of a carbon monoxide (CO) catalytic filter 238 that allows the exhaust 118 to pass through and remove carbon monoxide (CO) from the exhaust 118 of the gas turbine 116. You may take As shown, the CO catalytic filter 238 is disposed upstream of the HRSG 122 that is operably coupled to the exhaust passage 120 of the gas turbine 116 to produce steam for the steam turbine. The CO catalytic filter 152 can perform the desired catalytic conversion of CO to carbon dioxide (CO ₂ ) or other less toxic pollutants in a conventional manner, now known or later developed. A CO catalyst material can be included. In one example, the CO catalyst filter 238 includes a honeycomb array of ceramic monoliths (eg, FeCrAl) coated with a washcoat including, for example, aluminum oxide, titanium dioxide, silicon dioxide and / or silica including alumina, and ceria or ceria. -Zirconia and catalysts such as but not limited to platinum, palladium, rhodium, cerium, iron, manganese and / or nickel. The CO catalytic filter 238 may be a bidirectional or tridirectional converter. In operation, exhaust 118 passes through a CO catalytic filter 238 where carbon monoxide is converted to carbon dioxide in a conventional manner. The exhaust 118 may then be discharged to the atmosphere or used in a conventional manner downstream of the ER system 200 for heat recovery.

  In another embodiment shown in FIG. 3, the exhaust filter 202 may take the form of a combined SCR / CO catalytic filter 242. In this embodiment, the exhaust filter 202 includes both an SCR filter layer and a CO catalyst filter layer and functions to remove both NOx and CO. In other embodiments, as described herein (FIG. 9), both the SCR system 210 and the CO catalytic filter 238 may be provided upstream of the HRSG 122.

  Continuing with FIGS. 3 and 4, the retraction system 204 is operably coupled to the exhaust passage 120 of the gas turbine 116 and exhausts between a first position 212 within the exhaust path and a second position 230 outside the exhaust path. It is operable to selectively move the filter 202. In this way, as described in more detail herein, the ER system 200 allows the ER system 200 to be immediately downstream of the exhaust outlet of the gas turbine 116 and / or of the HRSG 122 for reduced emissions at low load or start-up conditions. A temporary placement of the exhaust filter 202 upstream, when operation shifts to high load, and / or when the exhaust temperature exceeds the design temperature of the exhaust filter 202 (eg, the temperature range for the exemplary SCR catalyst is 176 °). C-398 ° C (ie 350 ° F-750 ° F), some SCR materials can be used up to 480 ° C (ie about 900 ° F), and in extreme cases up to 537 ° C (ie about 1000 ° C). The exhaust filter 202 (which can be used up to F)) can be removed. As described, the second position 230 may be within the exhaust passage 120 or outside the exhaust passage 120, but in any case is outside the exhaust path.

  Exhaust filter 202 and retraction system 204 can take a variety of different forms.

  In the embodiment of FIG. 3, the exhaust filter 202 may include a series of pivotally coupled panels 240A-E, as better shown in FIGS. Any number of panels 240, such as 2, 3, 4, ... 10, may be used in this manner. In this embodiment, the exhaust filter 202 may resemble a vertically retractable garage door. As best shown in FIGS. 5-6, in one embodiment, each panel 240A-E includes an open structural frame 250 (FIG. 6) having therein a filter medium 252 (FIG. 5) through which exhaust 118 passes. Can be included. The open structure frame 250 can have any desired shape or size for the particular gas turbine 116 to which it is attached and for which certain toxins are removed. Filter medium 252 may include any filter material suitable for the type of toxin removed, for example, carbon monoxide (CO) catalytic filters and / or SCR filters. Each panel 240A-E can have the necessary thickness for the desired emission reductions implemented thereby. In one example, each panel 240A-E has a thickness of less than 0.6 meters. In one embodiment shown in FIG. 5, each panel 240A-E is pivotally coupled to at least one adjacent panel by a hinge 254. Hinge 254 can take the form of any hinge capable of withstanding the environmental conditions within exhaust passage 120 and structurally rotatably supporting panels 240A-E. Any number of hinges 254 may be used between the panel pairs 240AE, for example 1, 2, 3, etc. In other embodiments, other mechanisms for rotatably connecting the panels 240A-E may be employed, including the length of loop material 256 (FIG. 6) such as metal cables, chains, and the like from one panel. And an arcuate member (not shown) that extends and seats on an adjacent panel. The open structural frame 250 can be made of any material that provides structural support and can withstand the environmental conditions within the exhaust passage 120, such as a refractory metal or metal alloy. As shown only in FIG. 6, each open structure frame 250 includes a movable closure 258 that selectively closes and allows access to the access opening 260 to the interior of the frame 250. You can Movable closure 258 can take the form of any type of movable closure such as, but not limited to, pivoting doors (not shown), sliding doors, and bolted covers. Each filter media 252 may be replaceable and may be replaced through the access opening 260. Note that in FIG. 6, the exhaust filter 202 is shown in a curved expanded configuration to show the size and shape of its components. In operation, as shown in FIGS. 7-8, the panels 240A-E are vertically stacked so as to form a filter wall through which the exhaust 118 must pass to travel downstream of the exhaust passage 120. You can

  Also, as shown in FIG. 6, flexible mesh 262 may cover at least a portion of the outside of panels 240A-C to protect filter media 252 therein. The flexible mesh 262 can be any form of mesh that allows the exhaust to pass through but protects the filter media 252, such as flexible metal screens, chain mail, and the like. The flexible mesh 262 must also be able to withstand the environmental conditions within the exhaust passage 120. The flexible mesh 262 can collectively or individually cover the panels 260A-C and is preferably replaceable.

  In one embodiment shown in FIGS. 5, 7 and 8, each panel 240A-E may have a pair of opposed bearings 268 extending from opposite ends of the respective panel. In this case, the retraction system 204 can include a pair of bearing tracks 260A, 260B configured to receive selected opposing end bearings 268 of the opposing bearing pairs of the panels 240A-E. That is, the bearing 268 is configured to mate with the track system 260A, 260B, which then directs the positioning of the exhaust filter 202. As shown in FIGS. 7 and 8, bearing track pairs 260A, 260B, respectively, position exhaust filter 202 in first position 212 of exhaust passage 120 in response to bearing 268 being in first portion 263. A first portion 263 configured as such. Further, each of the bearing track pairs 260A, 260B includes a second portion 264 configured to place the exhaust filter 202 in the second position 230 in response to the bearing 268 being in the second portion 264. Also, each bearing track pair 260A, 260B includes a transition portion 266 that joins the first portion 263 and the second portion 264, respectively. In this manner, the exhaust filter 202 can move from the first position 212 to the second position 230 as the bearing 268 moves along the tracks 260A, 260B. The bearing tracks 260A, 260B can take any form capable of receiving and / or retaining the bearing 268, such as L-shaped, U-shaped, U-shaped with rounded ends, and the like.

  Actuator 270 is configured to move exhaust filter 202 along bearing track pair 260A, 260B. Actuator 270 can include any form of electrically powered system that can move exhaust filter 202 along tracks 260A, 260B. In one example, the actuator 270 can include an electric, hydraulic or pneumatic motor 272 coupled to the top panel 240D of the exhaust filter 202 by a transmission linkage 274 (eg, chains, cables, etc.). The transmission linkage 274 may be a length of material wound on / wound from a reel coupled to the motor 372, or a pair of gears, one coupled to the motor 272 and one coupled to the exhaust filter 202. It may take various forms, such as, but not limited to, a band of chains arranged in. Actuating the motor 272 in one direction moves the exhaust filter 202 from the first position 212 to the second position 230, and operating the motor 272 in the opposite direction moves the exhaust filter 202 from the second position 230 to the first position 212. Move to. 7 and 8, the motor 272 of the actuator 270 may be within the filter enclosure 290 (FIG. 7) or outside the exhaust passage 120 and the filter enclosure 290 (FIG. 8). When outside the filter enclosure 290, any form of transmission 291 (FIG. 8), such as a drive shaft, gearbox, drive chain, etc., can extend into the enclosure 290 if desired. The retraction system 204 described above may be modified in a wide variety of ways including, but not limited to, more or less trajectories, different transmissions, different actuator motors, etc. The actuator 270 is controlled by the controller 180, as will be further described.

  In the embodiment shown in FIG. 7, the second position 230 is outside the exhaust passage 120. In this case, the exhaust passage 120 can include an opening 280 configured to allow the exhaust filter 202 to pass therethrough and move to the outside of the exhaust passage 120. The opening 280 can be provided in the wall 282 of the exhaust passage 120, for example. In the illustrated example, the wall 282 includes the upper wall of the exhaust passage 120, but may be any wall of the exhaust passage 120. The opening 280 may be configured to be selectively openable and closable under the control of the control device 180 by an automated closing part 284, such as a swing door or a sliding door. Additionally, the opening 280 may be configured to allow the tracks 260A, 260B to pass through. When the opening 280 is open, the exhaust filter 202 can pass it, when closed, the exhaust filter 202 cannot pass it, and the exhaust passage 120 is closed to the environment. Any form of atmospheric enclosure 286 can be provided to close the exhaust passage 120 from the outside environment when the opening 280 is open.

  Some emission filters 202, such as SCR filters, are exposed to substances that can adversely affect their ability to function, such as dust, high or low moisture and / or the atmosphere or environment that exposes them to other atmospheric conditions. Should not be. For this purpose, an exhaust filter enclosure 290 may be provided outside the exhaust passage 120, as shown in FIG. In this case, in the second position 230, the exhaust filter 202 is located within the exhaust filter enclosure 290. The exhaust filter enclosure 290 can include any form of divider that can prevent the exhaust filter 202 from being exposed to undesirable conditions, such as dust, moisture, and the like. The exhaust filter enclosure 290 can be, for example, a hard surface box, such as plastic or metal, a flexible partition, such as a bag. Although shown positioned relative to wall 282 of exhaust passage 120, enclosure 290 can be spaced from exhaust passage 120.

  In another embodiment shown in FIG. 8, the second position 230 is inside the exhaust passage 120 but outside the exhaust path. In this case, the tracks 260A, 260B provide a second position 230 at a location outside the exhaust path but still within the exhaust passage 120. Although inside the exhaust passage 120, some exhaust filters 202 should not be exposed to higher loading conditions of the exhaust 118, such as higher temperatures. For this purpose, an exhaust filter enclosure 292 may be provided inside the exhaust passage 120, as shown in FIG. In the second position 230 of FIG. 8, the exhaust filter 202 is located within the exhaust filter enclosure 292 within the exhaust passage 120. The exhaust filter enclosure 292 can include any form of partition that can prevent undesired conditions within the exhaust passage 120, eg, exposure of the exhaust filter 202 to high temperatures. The exhaust filter enclosure 292 can be, for example, a metal hard surface box. Although shown positioned against wall 282 of exhaust passage 120, enclosure 292 can be spaced from any wall of exhaust passage 120. To protect the exhaust filter 202 during higher load conditions, the exhaust filter enclosure 292 includes a closable opening 294 configured to allow movement of the exhaust filter 202 therethrough when open. be able to. The opening 294 may be configured to be selectively openable and closable under the control of the control device 180 by an automated closing part 297, for example, a swing door, a sliding door, or the like. Additionally, the opening 294 may be configured to allow the tracks 260A, 260B to pass through. When the opening 294 is open, the exhaust filter 202 can pass it, when closed, the exhaust filter 202 cannot pass it, and when inside the enclosure 292, in the exhaust passage 120. Protected from conditions. In this embodiment, the motor 272 of the actuator 270 may be within the exhaust passage 120 and the filter enclosure 292, as shown, or outside. When outside the exhaust passage 120, any form of transmission 291 such as a drive shaft, gearbox, drive chain, etc. may extend into the enclosure 292 as needed.

  Referring to FIGS. 6 and 9, in another embodiment, the retraction system 204A may include an actuator 270 as in the previous embodiments, but with a second exhaust filter 202 rather than a track system 260A, 260B. A lamp 296 is provided that can be directed to position 230. The lamp 296 may be formed as a single planar element that also functions as the enclosure 298. The ramp 296 and the actuator 270 may be outside the exhaust passage 120. A selectively releasable opening 299 may be provided in the exhaust passage 120 to allow selective movement of the exhaust filter 202 between the first position 212 and the second position 230 (phantom line). The ramp 296 includes a curved portion 301 that allows the panels 240A-E of the exhaust filter 202 to stack and drop into the first position 212. Any form of guide element (not shown) necessary to ensure proper positioning and movement of the exhaust filter 202 may be applied.

  FIG. 9 also illustrates any embodiment where the exhaust filter 202 includes an SCR system 210 that includes an SCR filter 206 and a carbon monoxide (CO) catalytic filter 238 upstream of the SCR filter 206. Both the SCR filter 206 and the CO catalytic filter 238 are upstream of the HRSG 122. Both the SCR filter 206 and the CO catalytic filter 238 can be retractably mounted in their respective retracting systems 204A, 204B. Retraction system 204B can take any of the forms described herein. In the example shown, retraction system 204B is similar to retraction system 204 of FIG. 8 inside exhaust passage 120.

  With reference to FIGS. 10-14, in another embodiment, the ER system 200 of the power plant 110 that includes the gas turbine 116 may include an exhaust filter 302 that includes a first panel 340 and a second panel 342. Each of the panels 340, 342 can include an SCR filter for the SCR system 210, a CO catalytic filter (as in FIG. 6), or a combination of SCR and CO filters, as shown in FIG. In this embodiment, the panels 340, 342 slide in from the sides of the exhaust passage 120 rather than on a vertically oriented track as in FIGS. 3-9. Each panel 340, 342 may be configured similarly to panels 240A-E (FIG. 6) and internally have a filter medium 252 through which the exhaust 118 passes to remove exhaust components of the gas turbine 116 exhaust. It may include an open structure frame 250 having. In contrast to pivotally coupled panels 240A-E, each panel 340, 342 is laterally moved into position and sized to cover most of the cross-section of exhaust passage 120. . As shown in FIG. 11, each panel 340, 342 may occupy, for example, 50% of the cross-sectional area of the exhaust passage 120, but in any case, the cross-sectional areas are collectively collected so as to cross the exhaust passage. cover. Each panel 340, 342 can have any thickness (along the exhaust path) necessary to provide the desired emission reduction, eg, less than 0.6 m.

The retraction system 304 is operably coupled to the exhaust passage 120 of the gas turbine 116 to move the panels 340, 342. In this embodiment, the retraction system 304 is, for example, under the control of the controller 180, a first and a second position in the exhaust passage 120 between a first position 212 within the exhaust path and a second position 230 outside the exhaust path. Each of the two panels 340, 342 can be selectively moved laterally. Retraction system 304 can include various structures that allow panels 340, 342 to be laterally moved between first position 212 and second position 230 in an automated manner. In one embodiment shown in FIGS. 11-13, retraction system 304 can include first and second bearing tracks 350, 352 configured to direct movement of panels 340, 342. The first bearing track 350 extends laterally from within the exhaust passage 120 through the first side opening 356 of the exhaust passage 120 to receive the first panel 340 and allow lateral movement of the panel. Configured (eg, size and shape). As shown in FIG. 14, the first side opening 356 is configured (eg, size and shape) to allow movement of the first panel 340 therethrough. Similarly, as shown in FIGS. 11-13, the second bearing track 352 extends laterally from within the exhaust passage 120 through the second side opening 358 of the exhaust passage 120 to receive the second panel 342. Is configured to allow lateral movement of the panel . The second side opening 358 (FIG. 11) is configured to allow movement of the second panel therethrough, similar to the opening 356 of FIG.

  As best shown in FIG. 14 for bearing races 350, in the illustrated embodiment, each bearing race 350 (and 352 in FIGS. 11-13) includes a pair of vertically extending laterally within exhaust passage 120. Directionally spaced track elements 360, 362 (FIG. 14 only) may be included such that each panel, eg 340, moves between the first position 212 (FIG. 11) and the second position 230 along the track element. May be enabled. Each orbital element 360, 362 extending from one side of the exhaust passage 120 may be integrated with its corresponding orbital element (352 in FIGS. 11-13) extending from the other side of the exhaust passage 120, and thus each top and The lower track elements 360, 362 are unitary. However, they may be four individual orbital elements. In the example shown, the track elements 360, 362 include U-shaped elements, but any element capable of laterally guiding the respective panel may be provided. In the illustrated example, each panel 340, 342 includes one or more bearings for engaging a respective bearing track 350, 352, and more specifically, a respective track element 360, 362. 364 may be included, which allows the panel to be guided laterally by the track elements 360,362. In one example, as shown in FIG. 14, the bearing 364 can include a plurality of wheels 366 for rolling engagement with each track element 360, 362 (such as a heavy sliding glass door). Other bearing mechanisms that allow movement, such as skids or rolling tracks, may also be provided. In another embodiment, bearings 364 may be provided only on the top or bottom of each panel. For example, the bearings 364 may include slide bearings or rotary bearings that engage horizontal raceways on the upper raceway element 360 without providing load bearing bearings on the lower raceway element, or for non-induction only. Load-bearing bearings can be provided on the lower track element 362 (such as glass shower doors or sliding hanging closet doors).

  The ER system 200 also includes first and second panels 340, 342, respectively, between a first position 212 in the exhaust path within the exhaust passage 120 and a second position 230 laterally outside the exhaust passage. An actuator 370 configured to move may be included. The actuator 370 can take various forms. In one embodiment best shown in FIG. 14, the actuator 370 is movable along a panel along track elements 360 and / or 362, such as a loop of a chain that is moveable by a motor 372 and coupled to the panel 340 or 342. A linkage 368 to a motor 372 that forces the movement of 340, 342 may be included. There are a wide variety of actuators that can provide this type of movement, all of which are considered within the scope of this disclosure. In one embodiment shown in FIG. 14, the actuator 370 is configured to move the panel 340, 342 along a track element 360, 362 with a garage door actuator, eg, a motor under control of the controller 180. It is similar to a chain or a motor having a rotating gear that meshes with a pinion gear on the panels 340, 342 (see FIGS. 18-19). More than one motor may be used if desired, eg, one on each side of the exhaust passage 120.

  As best shown in FIG. 14, side opening 356 (and side opening 358 of FIGS. 11-13) may include closure 376. The closure 376 is controllable by the controller 180 and is capable of externally sealing the exhaust passage 120 when the exhaust filter 302 is not in use, such as any form of self-closing element, such as a slide closure, a closure. It can include moving doors and the like.

  As shown in FIG. 14, in one optional embodiment, the ER system 200 can further include a first panel enclosure 380 configured to receive the first panel 340 in the second position 230. As shown, the first panel enclosure 380 is coupled to the exhaust passage 120 and covers the first side opening 356. As shown in FIG. 12, the second panel enclosure 382 is configured to receive the second panel 342 in the second position 230. The second panel enclosure 382 is coupled to the exhaust passage 120 and covers the second side surface opening 358 (FIG. 11). Each enclosure 380, 382 can include a closure for closing the opening into which the respective panel enters the enclosure. In the example of FIG. 14, the closure 376 may serve the dual purpose of closing the side openings 356, 358 (FIG. 11) of the exhaust passage 120 and closing the enclosures 380, 382. Alternatively, each enclosure 380, 382 may include its own dedicated self-closing portion.

  Referring to FIGS. 13 and 14, the ER system 200 also includes a second panel 342 between the first pivoting element 390 coupled to the first panel 340 and the panels 340, 342 and respective bearings 364. It may include a second pivoting element 392 coupled thereto. Each pivot element 390, 392 may allow pivoting of a respective panel from the second position 230 to a storage position 232 adjacent the outside 394 of the exhaust passage 120. The track elements 360, 362 can include cutouts 377 or other features to allow pivotal movement of the respective panel away from the track elements 360, 362 to a storage position 232. In this way, each panel 340, 342 can be moved laterally from the exhaust passage 120 to clear it adjacent to the exhaust passage 120 and reduce the footprint of the ER system 200. . Any type of motor drive can be provided to power the rotation. In one embodiment shown in FIG. 14, the panel enclosures 380, 382 (FIG. 12) may be configured to receive and additionally move the respective panels 340, 342 to the storage position 232. In this case, the pivoting element 390 of the panels 340, 342 may be omitted, and each enclosure 380, 382 may include a pivoting element 396, which collectively pivots the enclosure and the panels therein to the storage position 232. Can be moved.

  15-18, shown is an ER system 200 for a power plant 110 that includes a gas turbine 116 according to another embodiment. In this embodiment, the exhaust filter 402 is similar in structure to panels 240A-E (FIGS. 6-8) and panels 340, 342 (FIG. 14), but with exhaust passage 120 of exhaust passage 120 covering all exhaust passages. It includes a single panel sized to extend across the cross-sectional area. In the example shown, the exhaust filter 402 selectively moves vertically between the first position 212 and the second position 230. As shown in FIG. 17, the exhaust filter 402 includes an open structural frame 250 having a filter medium 252 through which the exhaust 118 passes to remove exhaust components of the gas turbine exhaust, similar to the previous embodiment. be able to. As with the previous embodiments, the exhaust filter 402 may include an SCR filter for the SCR system 210, a CO catalytic filter (such as FIG. 6), or a combination of SCR and CO filters, as shown in FIG. it can.

  The retraction system 404 is operably coupled to the exhaust passage 120 of the gas turbine 116. In this embodiment, the retraction system 404 includes an exhaust filter through an opening 456 in the top wall 458 of the exhaust passage 120 between a first position 212 in the exhaust passage within the exhaust passage and a second position 230 outside the exhaust passage. 402 is selectively moved vertically. As best shown in FIG. 16, the opening 456 can include a closure 476 therefor. The closure 476 is controllable by the controller 180 and is capable of externally sealing the exhaust passage 120 when the exhaust filter 402 is not in use, such as any form of self-closing element, such as a slide closure, a closure. It can include moving doors and the like.

  Retraction system 404 can take various forms. In one example, as shown in FIGS. 16 and 17, the retraction system 404 is similar to that shown in FIG. 14 except that the retraction system 404 is set vertically and moves the exhaust filter 402 vertically rather than horizontally. . Here, the retraction system 404 can include a first bearing track 450 that extends vertically from within the exhaust passage 120 through an opening 456 (in the top wall 458) of the exhaust passage 120. The bearing track 450 is configured (eg, size and shape) to guide the first side 460 of the exhaust filter 402 through the opening 456. Similarly, the retraction system 404 extends vertically from within the exhaust passage 120 through an opening 456 in the exhaust passage and through the opening 456 a second side 462 configured to direct the second side 462 of the exhaust filter 402. A bearing track 452 may be included. In the illustrated example, the bearing tracks 450, 452 include U-shaped elements, but any element that can guide the exhaust filter 402 laterally can be provided. In the illustrated example, the exhaust filter 402 may not include bearings thereon, but as described with respect to panels 340, 342 (FIG. 14), the exhaust filter 402 is required for vertically guided movement. Correspondingly, one or more bearings may be included for engaging each bearing track 450, 452. Bearing mechanisms may be provided to allow movement, such as rollers / wheels, skids, or rolling tracks.

The ER system 200 according to the embodiment of FIGS. 15-17 also moves the exhaust filter 402 between a first position 212 in the exhaust path within the exhaust passage 120 and a second position 230 vertically outside the exhaust passage. An actuator 470 configured to do so. The actuator 470 can take various forms. In one embodiment best shown in FIGS. 16-17, the actuator 470 is along a bearing track 450, 452, such as, for example, a loop of a chain that can be moved by a motor 472 and is coupled to a panel 340 or 342. A linkage 468 to the motor 472 may be included that forces the exhaust filter 402 to move. There are a wide variety of actuators that can provide this type of movement, all of which are considered within the scope of this disclosure. In one embodiment, as shown in FIG. 17, actuator 470 is configured to move a garage door actuator, eg, a motor under control of controller 180, and exhaust filter 402 along bearing tracks 450, 452. Similar to a chain. In another embodiment shown in FIGS. 18 and 19, the actuator 470 includes a motor 478 having a rotary gear 480 that meshes with a pinion gear 482 on one or both sides of the exhaust filter 402 to raise or lower the exhaust filter. You can This type of rack and pinion actuator can also be applied to a side entry type embodiment as shown in FIG.

  The ER system 200 according to this embodiment may also include a pivoting element 490 coupled to the exhaust filter 402, as shown in FIGS. As best shown in FIGS. 16 and 19, the pivoting element 490 is disposed on the exhaust filter 402 from the second position 230 such that the exhaust filter 402 is adjacent the upper outer side surface 492 of the exhaust passage 120. To a storage position 232. Rotation of the exhaust filter 402 can be controlled by a motor 494 coupled to a pivot element 490 outside the exhaust passage 120.

  A filter enclosure 500 configured to receive the exhaust filter 402 in the second position 230 and movable to the storage position 232 may also be provided, as shown in FIG. As in the previous embodiment, the filter enclosure 500 can include a closure 502 for closing the opening through which the exhaust filter 402 enters the filter enclosure.

  FIG. 20 shows an alternative embodiment similar to that of FIGS. However, in this embodiment, the exhaust filter 402 extends over only a portion of the exhaust path at the first position 212, for example 30-70%. That is, the exhaust filter 402 does not cover the entire cross-sectional area of the exhaust passage 120. In this embodiment, the damper 510 is selectively moveable between an operating position 512 where the damper extends over the remainder of the exhaust path not covered by the exhaust filter 402 and a retracted position 514 outside the exhaust path. Can be. In this embodiment, a smaller exhaust filter 402 may be used and the damper 510 may act to control the exhaust path and force the exhaust 118 to pass through the exhaust filter 402. In the retracted position, the damper 510 is substantially out of the exhaust path so as not to provide resistance to the exhaust 118 passing through the exhaust passage 120. In one particular example, the exhaust filter 402 may include a CO catalyst filter that extends only in a portion of the exhaust path at the first location 212, and the damper 510 includes the remainder of the exhaust path where the damper is not covered by the CO catalyst filter. Is selectively movable between an operating position 512 that extends over a portion of the and a retracted position 514 outside the exhaust path. The damper 510 can be pivotally or slidably mounted and can include any suitable mechanism for controlling its movement, such as a hydraulic ram, a motor, or the like. Retraction system 404 operates similarly to that described with respect to FIGS.

  The controller 180 is operably coupled to the intake systems 204, 304, 404 and directs the intake systems 204, 304, 404 to direct the exhaust filters 202, 302, 402 to the exhaust 118 of exhaust from the gas turbine 116. It is configured to move between the first position 212 and the second position 230 depending on conditions. The controller 180, regardless of the embodiment used herein, may be an exhaust filter, such as panels 240A-E (FIGS. 7-8), panels 340, 342 (FIGS. 10-14) or a single panel exhaust filter. 402 (FIGS. 15-20) can be moved. Controller 180 may be part of a larger power plant control system (not shown) or it may be a separate entity that cooperates with the larger power plant control system. In any event, the controller 180 is used to control the retraction system described herein via hardware and / or software to deliver, but is not limited to, a reducing agent to the injector 220. Control any auxiliary equipment required for the operation of the ER system 200, such as the control valve 222 of any SCR system 210 (eg, FIG. 3). In one embodiment, the first position 212, where the emission filters 202, 302, 402 can be used, is the best possible emission filtering for toxins that are reduced under expected emission conditions at low plant load. Is selected to provide. Although not limited to start-up or low load conditions, the ER system 200 has high levels of certain toxins such as carbon monoxide (CO) or nitrous oxide, but is conventional emission filtering equipment (ie, downstream of heat exchange piping in the HRSG 122). Are especially advantageous during inoperable load conditions and the like. Low load conditions may include, for example, less than 15% of the total load of gas turbine 116 or combined cycle power plant 10. For this purpose, the first position 212 should be sufficiently close to the turbine 116 that the exhaust condition (s) are sufficient to ensure operation of the exhaust filters 202, 302, 402 during the desired load. Can be selected.

Emission conditions can include any number of exhaust conditions or combinations thereof. For example, a particular exhaust temperature may be required for a particular exhaust filter, such as SCR filter 206, to operate. Moreover, operation of the ER system 200 according to embodiments of the present disclosure may be undesirable unless certain exhaust components (eg, CO ₂ , CO or NOx, etc.) levels are high. To this end, ER system 200 operates to sense exhaust temperature of exhaust 118 and one or more emission conditions, such as at least one of at least one exhaust component level. Of the discharge condition sensor 300 may be included. Although a particular emission sensor 300 is shown, it is emphasized that other may be provided if desired. The emission condition is raw data measured by the specific sensor 300, or the amount of emission component per hour emitted to the atmosphere based on the emission component level in the exhaust 118 measured by the specific sensor 300, And may be interpolated data such as exhaust flow , turbine load or other parameters indicative of exhaust flow. Such interpolation is a well-known decision made by controller 180 and can be done in any way now known or later developed. ER system 200 also includes exhaust filters 202, 302, 402, position sensors for determining closure or damper position, etc., but is not limited to any other now known or later developed. Of the required sensors.

  In operation, according to one embodiment, the controller 180 responds to the exhaust temperature of the exhaust 118 being within a predetermined temperature range as measured by a suitable temperature sensor (sensor 300). The retraction system 204, 304, 404 can be instructed to move the 202, 302, 402 to the first position 212. In one embodiment, the predetermined temperature range can be from 398 degrees Celsius to 537 degrees Celsius (i.e., 750 to 1000 degrees Fahrenheit), but the range includes the size of the turbine 116, expected emission components that need to be reduced, etc. , May vary based on many factors. Further, the controller 180 moves the exhaust filters 202, 302, 402 from the exhaust path to the second position 230 in response to the exhaust temperature being outside the predetermined temperature range, for example, higher than 398 ° C. The retraction system 204, 304, 404 can be instructed.

  In another embodiment, the controller 180 retracts the exhaust filters 202, 302, 402 to the first position 212 in response to at least one exhaust component level exceeding a respective exhaust component limit. Systems 204, 304, 404 may be instructed. For example, the exhaust component may be CO having a level in excess of 2.0 parts per million, as measured by the sensor 300 measuring CO content, and / or the sensor measuring NOx content. NOx may have a level equal to greater than 19 kilograms per hour emitted into the atmosphere, as measured at 300. Further, the controller 180 causes the retraction system 204, to move the exhaust filters 202, 302, 402 to the second position 230 in response to the at least one exhaust component level not exceeding the respective exhaust component limit. 304, 404 can be instructed. When the load and other conditions indicative of the operability of the ER system 200 are no longer necessary or possible, for example, when the exhaust temperature is above 398 ° C., the intake system 204, 304, 404 causes the exhaust filter 202, 302, 402 to operate. The second position 230 can be retracted. Here, conventional emission abatement systems, such as the CO catalyst filter 152 in the HRSG 122 and / or the SCR system 154 are operating.

  It is understood that the exhaust filters 202, 302, 402 can be configured in any number of ways to provide the functionality herein. Each filter 202, 302, 402 in operation may extend for example up to 30 meters and have a thickness of less than about 0.6 meters.

  The drawings described above illustrate some of the related processing in accordance with some embodiments of the present disclosure. It should be noted that, in some alternative implementations / embodiments, the acts noted may occur out of the order noted, or for example, substantially simultaneously or vice versa, depending on the operations involved. May actually be executed in. One of ordinary skill in the art will also recognize that additional steps may be added that describe the process.

  It should be understood that the above description is intended to be illustrative rather than limiting. Thus, numerous other embodiments will be apparent to those of skill in the art upon reviewing the above description. Accordingly, the scope of the present subject matter should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

  For example, in one or more embodiments, an emission reduction system (200) for a power plant that includes a gas turbine (116) is provided. The system (200) is a retraction system operably coupled to an exhaust filter (202, 302, 402) and an exhaust passage (120) of a gas turbine (116), the exhaust passage (120) being a gas turbine (120). An exhaust path for exhaust (118) from the exhaust system (116), and the retraction system includes an exhaust filter (202, between a first position (212) within the exhaust path and a second position (230) outside the exhaust path). 302, 402) for selectively moving the retraction system.

  In some such embodiments, a power plant is a heat recovery steam generation operably coupled to an exhaust passage (120) of a gas turbine (116) for producing steam for a steam turbine (124). And a first location (212) upstream of the HRSG (122).

  In some such embodiments, the emission reduction system (200) is operably coupled to the retraction system and directs the retraction system to direct the emission filters (202, 302, 402) to the gas turbine (116). A control device configured to move between the first position (212) and the second position (230) may be further provided depending on the discharge conditions of the exhaust (118) from the. Exhaust conditions may include at least one of exhaust temperature of exhaust (118) and at least one exhaust component level.

  In some such embodiments, the controller controls the exhaust filter (202, 302, 402) to the first position (responsive to the exhaust temperature of the exhaust (118) being within a predetermined temperature range. 212) to direct the retraction system to move the exhaust filter (202, 302, 402) to the second position (230) in response to the exhaust temperature being outside the predetermined temperature range, Instructing the retraction system, the predetermined temperature range is 398 degrees Celsius and 537 degrees Celsius in some embodiments. However, in other embodiments, the controller moves the exhaust filter (202, 302, 402) to the first position (212) in response to the at least one exhaust component level exceeding the respective exhaust component limit. The retraction system to move the exhaust filter (202, 302, 402) to the second position (230) in response to the at least one exhaust component level not exceeding its respective exhaust component limit. Instruct the retract system.

  In at least one embodiment of the emission abatement system (200), the emission filter (202, 302, 402) can include a carbon monoxide (CO) catalytic filter (238). Alternatively, the exhaust filter (202, 302, 402) can include a selective catalytic reduction (SCR) filter (206, 216) and the SCR reductant upstream of the first position (212) in the exhaust passage (120). An injector (220) may further be included and is operably coupled downstream of the SCR filter (206, 216) and to the exhaust passage (120) of the gas turbine (116) producing steam of the steam turbine (124). A carbon monoxide (CO) catalytic filter (238) may further be included upstream of the heat recovery steam generator (HRSG) (122). And, in some such embodiments of the emissions reduction system (200), the emissions filter (202, 302, 402) includes a series of pivotally coupled panels (340, 342, 240). Each panel (340, 342, 240) faces an open structural frame (250) having a filter media (252) through which the exhaust (118) passes and the respective panel (340, 342, 240). A pair of opposed bearings (268, 364) extending from the ends.

  In some such embodiments of the emissions reduction system (200), the retraction system comprises a selected opposing end of opposing bearing pairs (268, 364) of the exhaust filter (202, 302, 402). A pair of bearing raceways (350,352,450,452,260A, 260B) configured to receive the bearings (268,364) and a pair of bearing raceways (350,352,450,452,260A, 260B). Respectively to place the exhaust filter (202, 302, 402) in the first position (212) of the exhaust passage (120) in response to the bearing (268, 364) being in the first portion (263). And a bearing (268, 364) in the second portion (264, 266) in response to the exhaust filter (202, 30). , 402) arranged to be placed in the second position (230), and a transitional portion (2) connecting the first portion (263) and the second portion (264, 266). 266) and an actuator (270, 370, 470) configured to move the exhaust filter (202, 302, 402) along the bearing track pair (350, 352, 450, 452, 260A, 260B). including.

  In some such embodiments, the emission abatement system (200) may further comprise an exhaust filter enclosure (290, 292) within the exhaust passageway (120), the second position (230) being an exhaust filter (230). 202, 302, 402) within the exhaust filter enclosure (290, 292).

  In some such embodiments of the emission reduction system (200), the exhaust passage (120) is configured to allow the exhaust filter (202, 302, 402) to move through it to the outside of the exhaust passage (120). The openings (280, 456) and the system (200) may further comprise an exhaust filter enclosure (290, 292) outside the exhaust passage (120), the second position (230) being an exhaust filter (230). 202, 302, 402) within the exhaust filter enclosure (290, 292).

  In some such embodiments, the emission reduction system (200) can further include an exhaust flow diverter (224) upstream of the emission filter (202, 302, 402).

  In a further related embodiment, a method for reducing emissions of a power plant including a gas turbine is proposed. A method provides an exhaust filter operably coupled to an intake system operably coupled to an exhaust passage of a gas turbine, the exhaust passage defining an exhaust path for exhaust from the gas turbine, and the intake system. And selectively moving the exhaust filter between a first position in the exhaust path and a second position outside the exhaust path, depending on the exhaust conditions of the exhaust from the gas turbine.

  In at least one embodiment of the method, the power plant further comprises a heat recovery steam generator (HRSG) operably coupled to an exhaust passage of the gas turbine to produce steam for the steam turbine, and Position 1 is upstream of HRSG.

  In at least one embodiment of the method, the exhaust conditions include at least one of exhaust gas exhaust temperature and at least one exhaust component level.

  In at least one embodiment of the method, the selective movement includes moving the exhaust filter to a first position in response to the exhaust temperature of the exhaust being within a predetermined temperature range and the exhaust temperature being predetermined. Moving the exhaust filter to the second position in response to being out of the temperature range. Alternatively, the selective movement includes moving the exhaust filter to a first position in response to the at least one exhaust component level exceeding a respective exhaust component limit, and the at least one exhaust component level having a respective exhaust component level. Moving the exhaust filter to the second position in response to not exceeding the limit.

  In one or more additional embodiments, an emission reduction system (200) for a power plant that includes a gas turbine (116) is provided. The system is an exhaust filter (202, 302, 402) including a first panel (340, 342, 240) and a second panel (340, 342, 240), each panel (340, 342, 240) comprising: An exhaust filter including an open structural frame (250) having a filter medium (252) through which the exhaust (118) passes to remove exhaust components of the exhaust (118) of the gas turbine (116); 116) and a retraction system (204, 304, 404, 204A, 204B) operably coupled to an exhaust passageway (120) of the exhaust gas passageway (120) of the gas turbine (116). (120) defining a retraction system (204, 304, 404, 204A, 204B) that has an exhaust path within the exhaust passage (120). The first position (212) and selectively moving laterally each of the first panel and the second panel (340,342,240) and a second position outside the exhaust path (230) of.

  In some such embodiments of the emission reduction system (200), the retraction system (204, 304, 404, 204A, 204B) includes a first side opening of the exhaust passage (120) from within the exhaust passage (120). First bearing raceways (350, 352, 450, 452, 260A, 260B) extending laterally through (356), the first panel (340, 342, 240) and the first panel (340, 342). , 240) and a first bearing track (350, 352, 450, 452, 260A, 260B) configured to receive a first side opening (356) configured to allow movement. , A second bearing track (350, 352, 450, 452, 26) extending laterally from within the exhaust passage (120) through a second side opening (358) of the exhaust passage (120). A, 260B), a second panel (340, 342, 240) and a second side opening (358) configured to allow movement of the second panel (340, 342, 240). A second bearing track (350, 352, 450, 452, 260A, 260B), a first position (212) in the exhaust path within the exhaust passage (120), and an exhaust passage ( 120) actuators (270, 370, 470) configured to move each of the first and second panels (340, 342, 240) to and from a laterally outer second position (230). Including and

  In some such embodiments, each panel (340, 342, 240) has a bearing (268, 364) for engaging a respective bearing track (350, 352, 450, 452, 260A, 260B). including.

  In some such embodiments, the emission reduction system (200) includes closures (284, 297, 376, 476, 502) for each of the first and second side openings (356, 358). Further prepare.

  In some such embodiments, the emission reduction system (200) is configured to receive a first panel (340, 342, 240) in a second position (230) with a first panel enclosure (380, 382), the first panel enclosure (380, 382) connecting to the exhaust passage (120) and covering the first side opening (356), and the second panel (340) at the second position (230). , 342, 240) for receiving a second panel enclosure (380, 382) coupled to the exhaust passage (120) and covering the second side opening (358). And an enclosure (380, 382).

  In some such embodiments, each enclosure (298) includes a closure (284, 297, 376, 476) for closing an opening into which the respective panel (340, 342, 240) enters the enclosure (198). , 502).

  In some such embodiments, the emission reduction system (200) includes a first pivoting element (390, 392, 396, 490) coupled to a first panel (340, 342, 240), and a second. A second pivoting element (390, 392, 396, 490) coupled to the panel (340, 342, 240) and each pivoting element (390, 392, 396, 490) in the second position (230). ) To the storage position (232) adjacent to the outside (394, 492) of the exhaust passage (120) to allow rotation of the respective panel (340, 342, 240). The emission reduction system (200) is configured to receive a first panel (340, 342, 240) in a second position (230) and is movable to a storage position (232) a first panel enclosure (380, 382) and a second panel enclosure (380, 382) configured to receive the second panel (340, 342, 240) in the second position (230) and movable to the storage position (232). It may be further provided.

  In some such embodiments of the emission abatement system (200), the power plant is operable in the exhaust passage (120) of the gas turbine (116) to produce steam for the steam turbine (124). Further included is a combined heat recovery steam generator (HRSG) (122), the first location (212) being upstream of the HRSG (122).

  In some such embodiments, the emission reduction system (200) is operably coupled to the retraction system (204, 304, 404, 204A, 204B) and the retraction system (204, 304, 404, 204A, 204B). ) To direct the first and second panels (340, 342, 240) of the exhaust filter (202, 302, 402) to the exhaust conditions (118) of the gas turbine (116). The apparatus further comprises a controller configured to move between the first position (212) and the second position (230). Exhaust conditions may include at least one of exhaust temperature of exhaust (118) and at least one exhaust component level.

  In some such embodiments, the controller is responsive to the exhaust temperature of the exhaust (118) being within a predetermined temperature range to provide a first and first exhaust filter (202, 302, 402). Instructing the retraction system (204, 304, 404, 204A, 204B) to move the two panels (340, 342, 240) to the first position (212) and the exhaust temperature is outside the predetermined temperature range. Accordingly, the retraction system (204, 304, 404, 204A, 204B) is instructed to move the exhaust filter (202, 302, 402) to the second position (230). In at least one embodiment, the predetermined temperature range is 398 degrees Celsius to 537 degrees Celsius.

  In at least one embodiment of the emission reduction system (200), the controller controls the first of the emission filters (202, 302, 402) in response to the at least one exhaust component level exceeding a respective exhaust component limit. And directing the retraction system (204, 304, 404, 204A, 204B) to move the second panel (340, 342, 240) to the first position (212), wherein at least one exhaust component level is present in each exhaust. Responsive to not exceeding the component limit, directing the retraction system (204, 304, 404, 204A, 204B) to move the exhaust filter (202, 302, 402) to the second position (230).

  In at least one embodiment of the emission abatement system (200), the emission filter (202, 302, 402) can include a carbon monoxide (CO) catalytic filter (238).

  In at least one embodiment of the emission reduction system (200), the emission filter may include a selective catalytic reduction (SCR) filter, further comprising an SCR reductant injector upstream of the SCR filter at the first location of the exhaust passage. Can be included. And, in some such embodiments, the emission reduction system (200) can further include a carbon monoxide (CO) catalytic filter downstream of the SCR filter.

  In one or more additional embodiments, an emission reduction system (200) for a power plant that includes a gas turbine (116) is provided. The system (200) includes an exhaust filter that includes an open structural frame (250) having a filter media (252) through which the exhaust (118) passes to remove exhaust components of the exhaust (118) of the gas turbine (116). (202, 302, 402) and a retraction system (204, 304, 404, 204A, 204B) operably coupled to the exhaust passage (120) of the gas turbine (116), the exhaust passage (120) being An exhaust path for exhaust (118) from the gas turbine (116) is defined and a retraction system (204, 304, 404, 204A, 204B) is disposed within the exhaust passage (120) at a first position (212) within the exhaust path. ) And the second position (230) outside the exhaust path, through the openings (280, 456) in the upper wall (458) of the exhaust passage (120). Selectively moving vertically filter (202, 302, 402).

  In some such embodiments, the retraction system (204, 304, 404, 204A, 204B) extends vertically from within the exhaust passage (120) through openings (280, 456) in the exhaust passage (120). A first bearing track (350, 352, 450, 452, 260A, 260B) configured to extend and guide the first side (460) of the exhaust filter (202, 302, 402) through the openings (280, 456). ) And vertically through the exhaust passage (120) through the openings (280, 456) of the exhaust passage (120) and opening the second side (462) of the exhaust filter (202, 302, 402). Second bearing raceways (350, 352, 450, 452, 260A, 260B) configured to be guided through (280, 456) and exhaust in the exhaust passageway (120). The exhaust filter (202, 302, 402) is configured to move between a first position (212) in the path and a second position (230) vertically outside the exhaust passage (120). Actuators (270, 370, 470).

  In some such embodiments, the emission reduction system (200) is a pivoting element (390, 392, 396, 490) coupled to the emission filter (202, 302, 402), the emission filter (200 Storage position (202, 302, 402) from the second position (230) where the exhaust filter (202, 302, 402) is located adjacent the upper outer side surface (394, 492) of the exhaust passage (120). 232) is further provided with pivoting elements (390, 392, 396, 490).

  In some such embodiments, the emission reduction system (200) is configured to receive the emission filter (202, 302, 402) in the second position (230) and is movable to the storage position (232). An optional filter enclosure (500). And, in some such embodiments, the filter enclosure (500) includes closures for closing the openings (280, 456) through which the exhaust filter (202, 302, 402) enters the filter enclosure (500). Can be included.

  In at least one embodiment of the emission reduction system (200), the emission filter (202, 302, 402) can extend only to a portion of the exhaust path in the first position (212) and the damper (510). Between the operating position (512) where the damper (510) extends over the rest of the exhaust path not covered by the exhaust filter (202, 302, 402) and the retracted position (514) outside the exhaust path. A damper, which is selectively movable between the two, may be further provided.

  In some such embodiments of the emission abatement system (200), the power plant is operable in the exhaust passage (120) of the gas turbine (116) to produce steam for the steam turbine (124). Further included is a combined heat recovery steam generator (HRSG) (122) with the first location (212) upstream of the HRSG (22, 122).

  In some such embodiments, the emission reduction system (200) is operably coupled to the retraction system (204, 304, 404, 204A, 204B) and the retraction system (204, 304, 404, 204A, 204B). ) To direct the exhaust filter (202, 302, 402) to the first position (212) and the second position (230) according to the exhaust conditions of the exhaust matter (118) from the gas turbine (116). A control device configured to move between may also be included. In at least one embodiment, exhaust conditions include at least one of exhaust temperature of exhaust (118) and at least one exhaust component level.

  In some such embodiments of the emission abatement system (200), the controller is responsive to the exhaust temperature of the exhaust (118) being within a predetermined temperature range, the exhaust filter (202, 302, 302). The retraction system (204, 304, 404, 204A, 204B) to move the (402) to the first position (212), and the exhaust filter (202) in response to the exhaust temperature being outside the predetermined temperature range. , 302, 402) to the second position (230) and direct the retraction system (204, 304, 404, 204A, 204B) to have a predetermined temperature range in at least one embodiment 398 degrees Celsius. ~ 537 degrees Celsius.

  In some such embodiments, the controller controls the exhaust filter (202, 302, 402) to the first position (212) in response to the at least one exhaust component level exceeding the respective exhaust component limit. The retraction system (204, 304, 404, 204A, 204B) to move to the exhaust filter (202, 302, 302, responsive to at least one exhaust component level not exceeding its respective exhaust component limit). Instructing the retraction system (204, 304, 404, 204A, 204B) to move 402) to the second position (230).

In some such embodiments of emission reduction system (200) , emission filters (202, 302, 402) include carbon monoxide (CO) catalytic filters (238). Alternatively, the exhaust filter (202, 302, 402) can include a selective catalytic reduction (SCR) filter, upstream of the SCR filter (206, 216) in a first position (212) of the exhaust passage (120). An SCR reductant injector (220) may further be included.

  And, in some such embodiments, the emission reduction system (200) further includes a carbon monoxide (CO) catalytic filter (238) downstream of the SCR filters (206, 216).

In at least one other additional embodiment, an emission reduction system (200) for a power plant that includes a gas turbine (116) is provided. The system is a carbon monoxide (CO) catalytic filter (238) that the exhaust passes through to remove carbon monoxide from the exhaust (118) of a gas turbine (116), the CO catalytic filter (238) being steam. A CO catalyst disposed upstream of a heat recovery steam generator (HRSG) (122) operably coupled to an exhaust passage (120) of a gas turbine (116) for producing steam for a turbine (124). A retraction system (204, 304, 404, 204A, 204B) operably coupled to a filter and an exhaust passage (120) of a gas turbine (116), the exhaust passage (120) from the gas turbine (116). Of the exhaust (118) of the exhaust system, and the retraction system (204, 304, 404, 204A, 204B) defines an exhaust path within the exhaust passage (120). Between a first position within the gas pathway (212) and a second position outside an exhaust path (230) to selectively move the CO catalyst filter (238), and a retraction system.

  In some such embodiments of the emission reduction system (200), the retraction system (204, 304, 404, 204A, 204B) includes an opening (280, 280) in the exhaust passage (120) from within the exhaust passage (120). 456) and a first bearing track (350, 352, 450, 452) that is configured to extend vertically through the first side (460) of the CO catalyst filter (238) and through the openings (280, 456). , 260A, 260B) and vertically extending from within the exhaust passage (120) through the openings (280, 456) of the exhaust passage (120) and opening the second side (462) of the CO catalyst filter (238). A second bearing track (350, 352, 450, 452, 260A, 260B) configured to be guided through the portion (280, 456) and the exhaust passage (120). An actuator configured to move a CO catalytic filter (238) between a first position (212) in the exhaust path and a second position (230) vertically outside the exhaust passage (120) ( 270, 370, 470).

  In some such embodiments, the emission reduction system (200) is a pivoting element (390, 392, 396, 490) coupled to a CO catalytic filter (238), the CO catalytic filter (238). Of the swivel element (390, 392, 396) that allows swiveling of the second position (230) from the second position (230) to the storage position (232) adjacent to the upper outer side surface (394, 492) of the exhaust passageway (120). 490).

  In some such embodiments of the emission abatement system (200), the second position (230) is within the exhaust passage (120).

  In some such embodiments of the emission reduction system (200), the CO catalytic filter (238) extends only to a portion of the exhaust path in the first position (212) and is a damper (510), Selective movement between damper (510) operating position (512) extending over the remainder of the exhaust path not covered by CO catalytic filter (238) and retracted position (514) outside the exhaust path. It may further include a damper.

  In some such embodiments, the emission reduction system (200) is operably coupled to the retraction system (204, 304, 404, 204A, 204B) and the retraction system (204, 304, 404, 204A, 204B). ) To the CO catalyst filter (238) between the first position (212) and the second position (230) depending on the exhaust conditions of the exhaust (118) from the gas turbine (116). A control device configured to move is further provided. In at least one embodiment, the emission conditions include at least one of an exhaust temperature of the exhaust (118) and a carbon monoxide (CO) level of the exhaust (118).

  In at least one other embodiment, the controller moves the CO catalytic filter (238) to a first position (212) in response to the exhaust temperature of the exhaust (118) being within a predetermined temperature range. The retraction system (204, 304, 404, 204A, 204B) may be instructed to activate the CO catalyst filter (238) to the second position (230) in response to the exhaust temperature being outside the predetermined temperature range. ), The retraction system (204, 304, 404, 204A, 204B) may be instructed. Alternatively, the controller is responsive to CO levels above the carbon monoxide (CO) limit to move the CO catalytic filter (238) to the first position (212) to the retraction system (204, 304, 404, 204A). , 204B), and the retraction system (204, 304, 404) to move the CO catalytic filter (238) to the second position (230) in response to the CO level not exceeding the CO limit. , 204A, 204B).

In at least one embodiment of the emissions reduction system (200), the predetermined temperature range is 398 degrees Celsius to 537 degrees Celsius. Also, the exhaust path of any or all embodiments may be free of other exhaust filters (202, 302, 402) upstream of the HRSG.

  The terminology used herein is merely for the purpose of describing particular embodiments and is not a limitation of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless explicitly stated otherwise. The terms "comprise" and / or "comprising", as used herein, refer to the presence of the listed features, integers, steps, acts, elements, and / or components. It will be further understood that the presence of one or more other features, integers, steps, acts, elements, components, and / or sets thereof, is not excluded, even though it is explicitly present. "Optionally" or "optionally" means that the subsequently described event or situation may or may not occur, and the explanation is that event It is meant to include the case where occurs and the case where the event does not occur.

  As used herein throughout the specification and claims, the wording that approximates applies to the modification of any quantitative expression that can be reasonably varied without altering the underlying basic function involved. can do. Thus, values modified with terms such as "approximately", "about" and "substantially" are not limited to the exact values specified. In at least some examples, the approximate wording may correspond to the accuracy of the instrument for measuring the value. Here, as well as throughout the specification and claims, range limits are combinable and / or substitutable, and unless otherwise indicated by context and language, such ranges are identified and are all subsumed therein. Including the subrange of. “About” applied to a particular value in a range, applied to both values, may refer to +/− 10% of the stated value, unless specifically dependent on the accuracy of the instrument measuring the value.

  All corresponding structures, materials, acts and equivalents of the means-plus-function or step-plus-function elements in the following claims are intended to perform that function in combination with the other claim elements specifically claimed. Is intended to encompass any structure, material, or operation of the. The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or to limit the disclosure to the disclosed form. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the disclosure. In order to best explain the principles and practical applications of the present disclosure and to enable others skilled in the art to understand the disclosure of various embodiments with various modifications to suit the particular use envisioned. The form was selected and explained.

10 Combined Cycle Power Plant 12 Gas Turbine System 14 Generator 16 Steam Turbine System 18 Second Generator 20 Rotating Shaft, Turbine Shaft 22 HRSG
24 superheater 26 power plant control system 30 compressor 32 combustor 34 combustion region 36 fuel nozzle assembly 38 gas turbine 40 CO catalyst system 42 SCR system 110 combined cycle power plant 112 gas turbine system 114 duct burner 116 gas turbine 118 exhaust 120 Exhaust passage 122 HRSG
124 steam turbine 150 heating pipe 150A heat exchange pipe 152 CO catalyst filter 154 SCR system 160 SCR filter 162 SCR reducing agent injector 164 reducing agent delivery system 166 reducing agent reservoir 168 reducing agent pump 170 control valve 172 evaporator 174 heater 176 air compressor 180 Power Plant Control Device 200 Emission Reduction System 202 Emission Filter 204 Retraction System 204A Retraction System 204B Retraction System 206 SCR Filter 210 SCR System 212 First Position 216 SCR Filter 220 SCR Reductant Injector 222 Control Valve 224 Shunt 230 Second Position 232 Storage position 238 CO catalyst filter 240 Panel 240A Panel 240D Top panel 242 CO catalyst filter 250 Open structure frame 252 Filter medium 254 Hinge 256 Loop material 258 Movable closure 260 Access opening 260A Bearing track, track system, panel 260B Bearing track, track system, panel 260C panel 262 Flexible mesh 263 First part 264 Second part 266 transition portion 268 bearing 270 actuator 272 pneumatic motor 274 transmission linkage 280 opening 282 wall 284 closure 286 atmospheric enclosure 290 exhaust filter enclosure 291 transmission 292 exhaust filter enclosure 294 opening 296 lamp 297 closure 298 enclosure 299 opening 300 exhaust Condition sensor, discharge sensor 301 Curved part 302 Discharge filter 304 Retraction system 340 First panel 342 Second panel 350 1 bearing track 352 2nd bearing track 356 1st side surface opening 358 2nd side surface opening 360 Upper track element 362 Lower track element 364 Bearing 368 Linkage 370 Actuator 372 Motor 376 Closure 377 Notch 380 1st panel enclosure 382 2nd Panel enclosure 390 Pivoting element 392 Pivoting element 394 Outside 396 Pivoting element 402 Exhaust filter 404 Retracting system 450 First bearing track 452 Second bearing track 456 Opening 458 Top wall 460 First side 462 Second side 468 Linkage 470 Actuator 472 motor 476 closing part 478 motor 480 rotating gear 482 pinion gear 490 turning element 492 upper outer side surface 494 motor 500 filter enclosure 502 closing part 510 damper 512 operating position 51 Retracted position

Claims (20)

An exhaust filter (202, 302, 402) for a power plant (10, 110) including a gas turbine (38, 116), said exhaust filter (202, 302, 402) comprising:
A series of pivotally coupled panels (240, 340, 342), each panel (240, 340, 342) removing an exhaust component of an exhaust (118) of the gas turbine (38, 116). An exhaust filter (202, 302, 402) comprising an open structural frame (250) having a filter media (252) through which the exhaust (118) passes.   Each panel (240, 340, 342) includes a pair of opposed bearings (268, 364) extending from opposite ends of each said panel (240, 340, 342), each bearing (268, 364) being An exhaust filter (202, 302, 402) configured to mate with a track system (260A, 260B) configured to direct the positioning of the exhaust filter (202, 302, 402). ).   The exhaust filter (202, 302, 402) of claim 1, wherein each filter media (252) is replaceable.   Each open structure frame (250) includes a movable closure (258) that selectively closes an access opening (260) to the interior of the frame and allows access to the access opening (260). An exhaust filter (202, 302, 402) according to claim 3.   The exhaust filter (202, 302, 402) of claim 1, further comprising a flexible mesh (262) covering at least a portion of the exterior of the panel (240, 340, 342).   The exhaust filter (202, 302, 402) of claim 1, wherein the filter media (252) comprises a carbon monoxide (CO) catalytic filter (152, 238, 242).   The exhaust filter (202, 302, 402) of claim 1, wherein the filter media (252) comprises a selective catalytic reduction (SCR) filter (160, 206, 216). An emission reduction system (200) for a power plant (10, 110) including a gas turbine (38, 116), the system comprising:
An exhaust filter (202, 302, 402) including a series of pivotally coupled panels (240, 340, 342), each panel (240, 340, 342) being passed by an exhaust (118). An exhaust filter including an open structural frame (250) having a filter media (252) and a pair of opposed bearings (268, 364) extending from opposite ends of each said panel (240, 340, 342). (202, 302, 402),
A retraction system (204, 304, 404, 204A, 204B) operably coupled to an exhaust passage (120) of the gas turbine (38, 116), the exhaust passage (120) being the gas turbine (38). , 116) from the exhaust path (118) and the retraction system (204, 304, 404, 204A, 204B) defines a first position (212) within the exhaust path and outside the exhaust path. An emission reduction system (200) including a retraction system (204, 304, 404, 204A, 204B) that selectively moves the emission filter (202, 302, 402) relative to a second position (230). . The retraction system (204, 304, 404, 204A, 204B) is
A pair of bearing raceways (configured to receive the selected opposing end bearings (268, 364) of the opposing bearings (268, 364) of the exhaust filter (202, 302, 402). 350, 352, 450, 452, 260A, 260B) and said pair of bearing tracks (350, 352, 450, 452, 260A, 260B) respectively in response to said bearings (268, 364) being there. And a first portion (263) configured to locate the exhaust filter (202, 302, 402) at the first position (212) of the exhaust passageway (120) and the bearings (268, 364). A second portion (264) configured to place the exhaust filter (202, 302, 402) in the second position (230) in response to being there. , The first portion (263) and said second portion (264) and a transition portion coupling the and (266),
An actuator (270, 370, 470) configured to move the exhaust filter (202, 302, 402) along the pair of bearing tracks (350, 352, 450, 452, 260A, 260B). An emission reduction system (200) according to claim 8.   The power plant (10, 110) is operatively coupled to the exhaust passage (120) of the gas turbine (38, 116) to produce steam for a steam turbine (124). The emission reduction system (200) of claim 8, further comprising a container (HRSG) (22, 122), wherein the first location (212) is upstream of the HRSG (22, 122). The exhaust filter (202, 302, 402) is operatively coupled to the retraction system (204, 304, 404, 204A, 204B) and directs the retraction system (204, 304, 404, 204A, 204B). Is configured to move between the first position (212) and the second position (230) depending on the exhaust conditions of the exhaust matter (118) from the gas turbine (38, 116). An additional control device (180),
The emission reduction system (200) of claim 8, wherein the emission conditions include at least one of an exhaust temperature of the exhaust (118) and at least one exhaust component level.   The controller (180) moves the exhaust filter (202, 302, 402) to the first position (212) in response to the exhaust temperature of the exhaust (118) being within a predetermined temperature range. Instructing the retraction system (204, 304, 404, 204A, 204B) to move, and the exhaust filter (202, 302, 402) in response to the exhaust temperature being outside the predetermined temperature range. The emission reduction system (200) of claim 11, instructing the retraction system (204, 304, 404, 204A, 204B) to move to the second position (230).   Each filter media (252) is replaceable and each open structural frame (250) selectively closes an access opening (260) to the interior of the frame and provides access to the access opening (260). 9. The emission reduction system (200) of claim 8, including a movable closure (258) that enables the.   The emission reduction system (200) of claim 8, further comprising a flexible mesh (262) covering at least a portion of the exterior of the panel (240, 340, 342).   The controller (180) moves the exhaust filter (202, 302, 402) to the first position (212) in response to the at least one exhaust component level exceeding a respective exhaust component limit. The exhaust system (204, 304, 404, 204A, 204B) in response to the at least one exhaust constituent level not exceeding the respective exhaust constituent limits. , 402) instructing the retraction system (204, 304, 404, 204A, 204B) to move the second position (230) to the second position (230).   The emission reduction system (200) of claim 8, wherein the emission filter (202, 302, 402) comprises a carbon monoxide (CO) catalytic filter (152, 238, 242).   The exhaust filter (202, 302, 402) includes a selective catalytic reduction (SCR) filter (160, 206, 216), at the first position (212) of the exhaust passageway (120), the SCR filter ( The emission reduction system (200) of claim 8, further comprising an SCR reductant injector (162, 220) upstream of 160, 206, 216).   The emission reduction system (200) of claim 17, further comprising a carbon monoxide (CO) catalytic filter (152, 238, 242) downstream of the SCR filter (160, 206, 216).   Further comprising an exhaust filter enclosure (290, 292) configured for mounting within the exhaust passageway (120) of the gas turbine (38, 116), the second position (230) including the exhaust filter (202, The emission reduction system (200) of claim 8, wherein (302, 402) is located within the emission filter enclosure (290, 292). The exhaust passage (120) includes openings (280, 456) configured to allow the exhaust filter (202, 302, 402) to pass through and move to the outside of the exhaust passage (120),
An exhaust filter enclosure (290, 292) may be further provided outside the exhaust passage (120), and the second position (230) may include the exhaust filter (202, 302, 402) in the exhaust filter enclosure (290, 292). The emission reduction system (200) of claim 8, wherein the emission reduction system is located within.

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