Radiation shield for gaseous fuel circuits

Abstract

A radiation shield is provided to block radiation at a gas turbine pipe connection joint. The radiation shield is configured to surround the gas turbine pipe connection joint. The radiation shield includes at least two shield sections that contact each other at a pair of flanged ends. The at least two shield sections collectively define an opening. Each shield section of the at least two shield sections includes an inner shell, an outer shell, and a thermal insulator disposed between the inner shell and the outer shell. One of the inner shell or the outer shell includes a pipe connection bracket that extends into the opening.

Description

[Technical Field]

[0001] The present disclosure relates generally to a radiation shield for a gas fuel circuit, and more particularly to a radiation shield for a gas fuel circuit of a gas turbine engine. [Background technology]

[0002] Turbomachines are utilized in various industries and applications for energy transfer. For example, a gas turbine engine typically includes a compressor section, a combustion section, a turbine section, and an exhaust section. The compressor section gradually increases the pressure of a working fluid entering the gas turbine engine and supplies the compressed working fluid to the combustion section. The compressed working fluid and fuel (e.g., natural gas) are mixed in the combustion section and combusted in a combustion chamber to generate high-pressure and high-temperature combustion gases. From the combustion section, the combustion gases flow into the turbine section, where they expand to produce work. For example, the expansion of the combustion gases in the turbine section can rotate a rotor shaft connected to, for example, a generator, to generate electricity. The spent combustion gases are then discharged as exhaust gases from the gas turbine through the exhaust section.

[0003] A gas turbine fuel system delivers gaseous fuel to a combustion section where it is burned to generate electricity. The gas fuel system generally includes gas transport manifolds and piping, gas control valves, gas stop ratio valves, and electrical components housed in a gas fuel module enclosure. As such, the gas fuel module enclosure typically includes a ventilation system to exhaust any gas leaks within the enclosure. Additionally, a separate leak detection system is used to detect any possible fuel leaks from components within the enclosure.

[0004] The gaseous fuel is conveyed through gaseous fuel-carrying components within the enclosure, such as piping, manifolds, connecting flanges, and / or valves, for delivery to the combustion section of the gas turbine engine. The gaseous fuel-carrying components are typically at very high temperatures (due to the high temperature of the gaseous fuel flowing therethrough), which can result in impaired radiative heat transfer between the gaseous fuel-carrying components and other components within the enclosure, such as electrical equipment, electrical wiring, and / or the ventilation system.

[0005] Conventional insulation (such as insulation wrap) cannot be used on gas fuel-carrying components due to the risk of explosion. For example, if gas fuel leaks from one or more of the gas fuel-carrying components, the gas fuel may become trapped within the insulation, creating an explosion risk. Furthermore, the trapped gas fuel cannot be detected by a gas fuel leak detection system within the enclosure.

[0006] Therefore, an improved system for preventing radiant heat transfer from gas fuel carrying components within an enclosure is desired, and in particular, an improved system for preventing radiant heat transfer from gas fuel carrying components without creating a risk of explosion within the enclosure would be desirable and understood in the art. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] U.S. Patent Application Publication No. 2018 / 0355746 Summary of the Invention

[0008] Aspects and advantages of the radiation shield and gaseous fuel supply system according to the present disclosure will be set forth in part in the description that follows, or may be obvious from the description, or may be learned through practice of the techniques thereof.

[0009] According to one embodiment, a radiation shield for blocking radiation at a gas turbine pipe connection joint is provided. The radiation shield includes at least two shield sections that contact each other at a pair of flanged ends. The at least two shield sections collectively define an opening such that the radiation shield is configured to surround the gas turbine pipe connection joint. Each shield section of the at least two shield sections includes an inner shell, an outer shell, and insulation disposed between the inner shell and the outer shell. One of the inner shell or the outer shell includes a pipe connection bracket extending into the opening to couple the radiation shield to the gas turbine pipe connection joint.

[0010] According to another embodiment, a gaseous fuel supply system for a gas turbine engine is provided. The gaseous fuel supply system includes a gaseous fuel supply and an accessory system fluidly coupled to a plurality of combustion cans in a combustion section of the gas turbine engine. The gaseous fuel supply system further includes an enclosure and a gas fuel circuit at least partially disposed within the enclosure. The gas fuel circuit is fluidly coupled to the gaseous fuel supply and to the accessory system. The gas fuel circuit includes a piping connection fitting within the enclosure. A radiation shield surrounds the piping connection fitting. The radiation shield includes at least two shield sections contacting each other at a pair of flanged ends. The at least two shield sections collectively define an opening. Each shield section of the at least two shield sections includes an inner shell, an outer shell, and insulation disposed between the inner and outer shells. One of the inner or outer shells includes a piping connection bracket extending into the opening and coupling the radiation shield to the piping connection fitting.

[0011] These and other features, aspects, and advantages of the present radiation shield and gaseous fuel supply system will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present technology and, together with the description, serve to explain the principles of the technology.

[0012] A complete and enabling disclosure of the present radiation shield and gaseous fuel supply system, including the best mode of making and using the system and method, directed to those skilled in the art, is set forth in this specification, which makes reference to the accompanying drawings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of a turbomachine (e.g., a gas turbine engine) according to an embodiment of the present disclosure. [Figure 2] 1 illustrates a schematic representation of a gaseous fuel supply system for a gas turbine engine according to an embodiment of the present disclosure. [Figure 3] FIG. 2 illustrates a rear-to-front perspective view of a portion of a gas fuel circuit and a radiation shield according to an embodiment of the present disclosure. [Figure 4] 4 illustrates an expanded view of a portion of the gas fuel circuit and radiation shield shown in FIG. 3 according to an embodiment of the present disclosure. [Figure 5] 5 shows a perspective view of the radiation shield of FIGS. 2-4 according to an embodiment of the present disclosure. [Figure 6] 6 shows an enlarged side view of the radiation shield of FIGS. 2-5, according to an embodiment of the present disclosure. [Figure 7] 7 shows an enlarged perspective view of the radiation shield of FIGS. 2-6, with the radiation shield partially exploded, according to an embodiment of the present disclosure. FIG. [Figure 8] 8 illustrates an exploded view of a shield portion of the radiation shield of FIGS. 2-7, according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] Reference will now be made in detail to embodiments of the present radiation shield and gaseous fuel supply system, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation, not limitation, of the present technology. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present technology without departing from the scope or spirit of the claimed technology. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield a still further embodiment. Accordingly, it is intended that the present disclosure cover such modifications and variations as come within the scope of the appended claims and their equivalents.

[0015] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Moreover, unless otherwise specified, all embodiments described herein are to be considered exemplary.

[0016] The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description are used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," and "third" can be used interchangeably to distinguish one component from another and are not intended to denote the location or importance of the individual components.

[0017] The term "fluid" may be a gas or a liquid. The term "fluid communication" means that a fluid can make a connection between designated areas.

[0018] As used herein, the terms "upstream" (or "forward") and "downstream" (or "aft") refer to relative directions with respect to the flow of fluid in a fluid pathway. For example, "upstream" refers to the direction from which fluid flows, and "downstream" refers to the direction from which fluid flows. However, as used herein, the terms "upstream" and "downstream" can also refer to the flow of electricity. The term "radially" refers to relative directions substantially perpendicular to the axial centerline of a particular component, the term "axially" refers to relative directions substantially parallel and / or coaxially aligned with the axial centerline of a particular component, and the term "circumferentially" refers to relative directions extending around the axial centerline of a particular component.

[0019] Approximate terms such as "about," "approximately," "generally," and "substantially" are not limited to the exact value specified. In at least some instances, approximate language can correspond to the precision of an instrument for measuring a value or the precision of a method or machine for constructing or manufacturing a component and / or system. For example, approximate language can refer to within a margin of 1, 2, 4, 5, 10, 15, or 20% of an individual value, a range of values, and / or any of the endpoints defining the range of values. When used in the context of an angle or direction, such terms include within a range of 10 degrees greater or less than the stated angle or direction. For example, "approximately perpendicular" or "substantially perpendicular" includes any direction, e.g., clockwise or counterclockwise, within 10 degrees of perpendicular.

[0020] Terms such as "coupled," "fixed," and "attached to," unless otherwise specified herein, refer to both direct coupling, fixing, or attachment, and indirect coupling, fixing, or attachment through one or more intermediate components or features. When one component is described as being "directly coupled," "directly fixed," or "directly attached" to another component, there are no intervening layers or components present.

[0021] As used herein, the terms "comprises," "comprising," "includes," "including," "has," "having," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that includes a list of features is not necessarily limited to only those features and may include other features not expressly listed or inherent in such process, method, article, or apparatus.

[0022] As used herein, the term "line" may refer to a fluid-carrying conduit such as a pipe, manifold, hose, tube, or other suitable fluid-carrying conduit.

[0023] Here, and throughout the specification and claims, in embodiments where range limitations are combined and interchanged, unless the context or language dictates otherwise, such ranges are identified and include all subranges subsumed therein. For example, all ranges disclosed herein are inclusive of the endpoints, and the endpoints of overlapping ranges are independently combinable with each other.

[0024] Referring now to the drawings, Figure 1 shows a schematic diagram of one embodiment of a turbomachine, which in the illustrated embodiment is a gas turbine engine 10. Although an industrial or land-based gas turbine is shown and described herein, the present disclosure is not limited to industrial and / or land-based gas turbines unless otherwise stated in the claims. For example, the assemblies and systems described herein may be used with any type of turbomachine, including, but not limited to, a steam turbine, an aircraft gas turbine, or a marine gas turbine.

[0025] As shown, gas turbine engine 10 generally includes an inlet section 12, a compressor section 14 disposed downstream from inlet section 12, a plurality of combustors (not shown) in a combustion section 16 disposed downstream from compressor section 14, a turbine section 18 disposed downstream from combustion section 16, and an exhaust section 20 disposed downstream from turbine section 18. Additionally, gas turbine engine 10 may include one or more shafts 22 coupled between compressor section 14 and turbine section 18.

[0026] Compressor section 14 may generally include a plurality of rotor disks 24 (one of which is shown) and a plurality of rotor blades 26 extending radially outward from and connected to each rotor disk 24. Each rotor disk 24 may in turn be coupled to or form an upstream portion of a shaft 22 extending through compressor section 14.

[0027] Turbine section 18 may generally include a plurality of rotor disks 28 (one of which is shown) and a plurality of rotor blades 30 extending radially outward from and interconnected to each rotor disk 28. Each rotor disk 28 may in turn be coupled to or form a downstream portion of a shaft 22 extending through turbine section 18. Turbine section 18 further includes an outer casing 31 circumferentially surrounding the downstream portion of shaft 22 and rotor blades 30, thereby at least partially defining a hot gas path 32 through turbine section 18.

[0028] In the exemplary embodiment, gas turbine engine 10 may further include a gaseous fuel supply system 100 fluidly coupled to combustion section 16. Gaseous fuel supply system 100 may supply a gaseous fuel (such as natural gas, hydrogen, or other gaseous fuel) to combustion section 16.

[0029] During operation, a working fluid, such as air, enters the compressor section 14 through the inlet section 12, where it is progressively compressed, resulting in compressed air being provided to the combustors in the combustion section 16. The compressed air is mixed with fuel (e.g., gaseous fuel from the gaseous fuel supply system 100) and combusted in each combustor to generate combustion gases 34. The combustion gases 34 pass from the combustion section 16 through the hot gas path 32 to the turbine section 18, where energy (kinetic and / or thermal energy) is transferred from the combustion gases 34 to the rotor blades 30, causing the shaft 22 to rotate. This mechanical rotational energy may then be used to power the compressor section 14 and / or generate electricity. The combustion gases 34 then exit the turbine section 18 and may be exhausted from the gas turbine engine 10 via the exhaust section 20 as exhaust gases.

[0030] 2, a schematic diagram of a gaseous fuel supply system 100 for a gas turbine engine 10 is shown in accordance with an embodiment of the present disclosure. As shown, the gaseous fuel supply system 100 may be fluidly coupled to a combustion section 16 of the gas turbine engine 10. For example, the combustion section 16 may include a plurality of combustion cans 17, and the gaseous fuel supply system 100 may be fluidly coupled to each of the plurality of combustion cans 17, as described below.

[0031] Gaseous fuel supply system 100 may include a gaseous fuel supply 102, an accessory system 104, an enclosure 106, and a gas fuel circuit 108 disposed at least partially within enclosure 106. Gaseous fuel supply 102 may be a tank, container, reservoir, pipeline, or other source of gaseous fuel (such as natural gas, hydrogen, or other gaseous fuel). Gaseous fuel supply 102 may be fluidly coupled to gas fuel circuit 108 via inlet line 110, and gas fuel circuit 108 may be fluidly coupled to accessory system 104 via outlet line 111.

[0032] In the exemplary embodiment, gas fuel circuit 108 may include, in serial flow order, inlet line 110, manifold 118, branch line 120, pump line 124, and outlet line 111. Inlet line 110 may extend between and fluidly couple gas fuel supply 102 and manifold 118. Manifold 118 may extend between and fluidly couple inlet line 110 and branch line 120. Branch line 120 may extend between and fluidly couple manifold 118 and pump line 124. Pump line 124 may be a T-shaped conduit having a first end fluidly coupled to pump 125, a second end opposite the first end and fluidly coupled to outlet line 111, and a third end axially offset from the first and second ends and fluidly coupled to branch line 120.

[0033] In many embodiments, the piping connection fitting 122 may be disposed between the branch line 120 and the pump line 124. For example, the pump line 124 may include a first flange 130 and the branch line 120 may include a second flange 132, which may be coupled to each other to form the piping connection fitting 122. In particular, the first flange 130 of the pump line 124 may be coupled to the second flange 132 of the branch line 120, thereby forming the piping connection fitting 122 that fluidly couples the pump line 124 to the branch line 120.

[0034] Enclosure 106 may include walls 107 that collectively enclose a majority of gas fuel circuit 108. Enclosure 106 may be disposed on floor 101 (e.g., the ground or a concrete pad). In an exemplary embodiment, enclosure 106 may define interior 105 (e.g., the interior may be collectively defined by walls 107 and / or floor 101). Various components of gas fuel circuit 108 may be disposed within interior 105 of enclosure 106.

[0035] As shown in FIG. 2 , the enclosure 106 may be fitted with a ventilation system 150 and a gas detection system 154 (e.g., a gas leak detection system), each in operative communication with the controller 300. The gas detection system 154 may include one or more sensors 156 configured to measure data indicative of the presence of gaseous fuel within the interior 105 of the enclosure 106. For example, the controller 300 may determine that a fuel leak has occurred in the gas fuel circuit 108 within the enclosure 106 based at least in part on the data indicative of the presence of gaseous fuel within the interior 105. In response, the controller 300 may activate the ventilation system 150. For example, the ventilation system 150 may include one or more pumps 152 fluidly coupled to the interior 105 and to the atmosphere. Thus, activating the pumps 152 removes any leaked gaseous fuel from the interior 105 (i.e., evacuates the interior 105).

[0036] Additionally, in many embodiments, electrical devices 158 and electrical wires 160 may be disposed within enclosure 106 (i.e., may be disposed within interior 105). Electrical devices 158 may include pumps, valves, sensors, or other electrical devices. Electrical wires 160 (or other electrical couplings) may include power cables, data cables, or other electrical wires 160. The gaseous fuel traveling through gas fuel circuit 108 within the enclosure may be at high temperatures (e.g., between about 300°F and about 600°F, or between about 150°C and about 315°C). Thus, electrical devices 158 and electrical wires 160 (as well as other devices within enclosure 106) may be susceptible to damage from radiant heat transfer from various components of gas fuel circuit 108.

[0037] The accessory system 104 is fluidly coupled to each combustion can 17 of the plurality of combustion cans 17. For example, the accessory system 104 may include a connecting line 112 and a distribution ring 114. The connecting line 112 may extend between a connecting flange 116 and the distribution ring 114. The connecting line 112 may be fluidly coupled to an outlet line 111 of the gas fuel circuit 108 outside the enclosure 106. That is, the outlet line 111 may extend through the wall 107 of the enclosure 106 and be fluidly coupled to the connecting line 112 of the accessory system 104. The distribution ring 114 may extend around an axial centerline of the gas turbine engine 10 and be fluidly coupled to each of the combustion cans 17.

[0038] In an exemplary embodiment, radiation shield 200 may be disposed within enclosure 106 (e.g., in interior 105). Radiation shield 200 may surround piping connection fitting 122 to prevent radiant heat transfer from piping connection fitting 122 from damaging other components within enclosure 106 (such as electrical devices 158, electrical wires 160, or the like).

[0039] 3 and 4, each figure illustrates a perspective view of a portion of the gas fuel circuit 108 within the enclosure 106 and radiation shield 200, according to an embodiment of the present disclosure. As shown, the radiation shield 200 may surround the piping connection fitting 122. The pump line 124 may include a first flange 130, and the branch line 120 may include a second flange 132, which may be coupled to each other to form the piping connection fitting 122. For example, as shown, the first flange 130 and the second flange 132 may be removably connectable via a plurality of fasteners 134, such as threaded fasteners (such as threaded nuts and bolts). Alternatively, the first flange 130 and the second flange 132 may be fixedly connected (via a welded or brazed joint).

[0040] The radiation shield 200 may include at least two shield portions, for example, a first or inner shield portion 210 and a second or outer shield portion 212, that contact each other at a pair of flanged joints 214. In an exemplary embodiment, the at least two shield portions (e.g., the first shield portion 210 and the second shield portion 212) may collectively define an opening 226. The piping connection joint 122 may be disposed within the opening 226. In an exemplary embodiment, as shown, the radiation shield 200 may include a first flanged end 215 and a second flanged end 217. In such an embodiment, when the inner and outer shield portions 210, 212 are attached to the piping connection joint 122, the first shield portion 210 and the second shield portion 212 may contact each other at the first flanged end 215 and the second flanged end 217. This advantageously allows for rapid disassembly of the radiation shield 200 for repair and / or inspection of the piping connection fitting 122 .

[0041] The inner shield portion 210 and the outer shield portion 212 may be separately attached to the pipe connection fitting 122 via a pipe connection bracket 204. For example, the pipe connection bracket 204 may extend into the opening 226 and couple to the first flange 130 and / or the second flange 132 of the pipe connection fitting 122. One of the inner shell 228 or the outer shell 230 of each shield portion 210, 212 may include the pipe connection bracket 204. At least one of the plurality of fasteners 134 may extend through the pipe connection bracket 204 of the inner shield portion 210 to couple the inner shield portion 210 to the pipe connection fitting 122. For example, at least one of the plurality of fasteners 134 may extend through the pipe connection bracket 204 of the inner shield portion 210 and through the pipe connection fitting 122 (e.g., through the first flange 130 and the second flange 132) to couple the inner shield portion 210 to the pipe connection fitting 122. Similarly, at least one of the plurality of fasteners 134 may extend through the pipe connection bracket 204 of the outer shield portion 212 to couple the outer shield portion 212 to the pipe connection fitting 122. For example, at least one of the plurality of fasteners 134 may extend through the pipe connection bracket 204 of the outer shield portion 212 and through the pipe connection fitting 122 (e.g., through the first flange 130 and the second flange 132) to couple the outer shield portion 212 to the pipe connection fitting 122.

[0042] 5-8, various views of a radiation shield 200 are shown in accordance with an embodiment of the present disclosure. In particular, FIG. 5 shows a perspective view of the radiation shield 200. FIG. 6 shows an enlarged side view of the radiation shield 200. FIG. 7 shows an enlarged perspective view of the radiation shield 200, showing the radiation shield 200 in a partially exploded state. FIG. 8 shows an exploded view of a shield portion 205 (such as the inner shield portion 210 or the outer shield portion 212) of the radiation shield 200 in accordance with an embodiment of the present disclosure.

[0043] The radiation shield 200 may define an opening 226 (which may have a circular cross-section, e.g., a circular opening) and an axial centerline 201. For example, the first shield portion 210 and the second shield portion 212 may collectively define the opening 226. During operation, the piping connection fitting 122 may be disposed within the opening 226 (as shown in FIGS. 3 and 4 ). The axial centerline 201 may extend through a center point of the opening 226. The radiation shield 200 may define a cylindrical coordinate system having an axial direction A extending along the axial centerline 201, a radial direction R orthogonal (or perpendicular) to the axial centerline 201, and a circumferential direction C extending around the axial centerline 201.

[0044] As described in more detail below, the inner shield portion 210 and the outer shield portion 212 may each include an inner shell 228, an outer shell 230 (at least partially radially spaced from the inner shell 228), and insulation 232 disposed between the inner shell 228 and the outer shell 230. The inner shell 228 of the inner shield portion 210 and the inner shell 228 of the outer shield portion 212 may collectively define an opening 226. As shown in FIG. 6 (e.g., by the phantom line representing the outermost surface 123 of the tubing connection fitting 122), the outermost diameter 127 of the tubing connection fitting 122 may be smaller than the innermost diameter 227 of the radiation shield 200 (collectively defined by the inner shells 228 of the inner shield portion 210 and the outer shield portion 212).

[0045] In other words, the innermost diameter 227 may be about 10% to about 50% larger than the outermost diameter 127 of the tubing connection fitting 122, or for example, about 20% to about 40%, or for example, about 25% to about 35% larger. Additionally, a gap 234 may be defined between the inner shell 228 and the outermost surface 123 of the tubing connection fitting 122. The gap 234 may be about 0.25 inches to about 3 inches (i.e., about 0.6 cm to about 7.6 cm), or for example, about 0.5 inches to about 2 inches (i.e., about 1.3 cm to about 5.1 cm), or for example, about 0.75 inches to about 1.5 inches (i.e., about 1.9 cm to about 3.8 cm), or for example, about 1 inch (i.e., about 2.54 cm). The gap 234 can advantageously provide ventilation (e.g., airflow) between the tubing connection fitting 122 and the radiation shield 200. Thus, even if gas fuel leaks from the piping connection fitting 122, there may be sufficient air flow to allow the fuel to be vented or removed from the piping connection fitting 122 (e.g., via the ventilation system 150) without creating a risk of explosion within the enclosure 106.

[0046] The first shield portion 210 and the second shield portion 212 may contact each other at the first flanged end 215 and the second flanged end 217 when attached to the piping connection fitting 122. This advantageously allows for rapid disassembly of the radiation shield 200 for repair and / or inspection of the piping connection fitting 122.

[0047] 8 , the inner shell 228 of the first shield portion 210 and the second shield portion 212 may include a first inner connection flange 236 at the first flanged end 215, a second inner connection flange 238 at the second flanged end 217, and an inner arcuate portion 240 extending between the first inner connection flange 236 and the second inner connection flange 238. Similarly, the outer shell 230 of the first shield portion 210 and the second shield portion 212 may include a first outer connection flange 242 at the first flanged end 215, a second outer connection flange 244 at the second flanged end 217, and an outer arcuate portion 246 extending between the first outer connection flange 242 and the second outer connection flange 244.

[0048] The first inner and outer connection flanges 236, 242 of the first shield portion 210 and the second shield portion 212 may be stacked on top of one another (as shown in FIG. 5 ) to collectively form the first flanged end 215 of the radiation shield 200. For example, the first inner and outer connection flanges 236, 242 of the first shield portion 210 and the second shield portion 212 may each be shaped as flat (or planar) plates that are generally parallel to one another, such that the first inner and outer connection flanges 236, 242 are stacked on top of one another and in flush contact with one another. In particular, the first inner connection flange 236 of the first shield portion 210, the first outer connection flange 242 of the first shield portion 210, the first outer connection flange 242 of the second shield portion 212, and the first inner connection flange 236 of the second shield portion 212 may be stacked on top of each other to collectively form a first flanged end 215 (also referred to as a first stacked flanged end or a first flanged joint).

[0049] Similarly, the second inner and outer connection flanges 238, 244 of the first shield portion 210 and the second shield portion 212 may be stacked on top of each other to collectively form the second flanged end 217 of the radiation shield 200. For example, the second inner and outer connection flanges 238, 244 of the first shield portion 210 and the second shield portion 212 may each be shaped as flat (or planar) plates that are generally parallel to each other, such that the second inner and outer connection flanges 238, 244 may be stacked on top of each other and be in flush contact with each other. In particular, the second inner connection flange 238 of the first shield portion 210, the second outer connection flange 244 of the first shield portion 210, the second outer connection flange 244 of the second shield portion 212, and the second inner connection flange 238 of the second shield portion 212 may be stacked on top of each other to collectively form a second flanged end 217 (also referred to as a second stacked flanged end or a second flanged joint).

[0050] 8 , which shows an exploded view of shield portion 205 (e.g., first shield portion 210 and / or second shield portion 212), insulation 232 may have a semicircular cross-sectional shape and may extend between first terminal portion 250 and second terminal portion 252. In other words, insulation 232 may be shaped as a hollow semi-cylinder and may be disposed between (e.g., radially between) inner arcuate portion 240 and outer arcuate portion 246. Inner arcuate portion 240 and outer arcuate portion 246 may have semicircular cross-sectional shapes.

[0051] In the exemplary embodiment, first inner connection flange 236 and second inner connection flange 238 extend radially outward across insulation 232. That is, first inner connection flange 236 may extend radially outward from inner arcuate portion 240 and across first terminal end 250 of insulation 232, such that first inner connection flange 236 contacts first terminal end 250 of insulation 232. Similarly, second inner connection flange 238 may extend radially outward from inner arcuate portion 240 across second terminal end 252 of insulation 232, such that second inner connection flange 238 contacts second terminal end 252 of insulation 232. This advantageously positions insulation 232 between inner arcuate portion 240 and outer arcuate portion 246.

[0052] The first outer connection flange 242 and the second outer connection flange 244 may each extend radially inward from the outer arcuate portion 246. For example, the first outer connection flange 242 may extend radially inward from the outer arcuate portion 246 across the first inner connection flange 236, such that the first outer connection flange 242 contacts the first inner connection flange 236. Similarly, the second outer connection flange 244 may extend radially inward from the outer arcuate portion 246 across the second inner connection flange 238, such that the second outer connection flange 244 contacts the second inner connection flange 238.

[0053] In the exemplary embodiment, piping connection brackets 204 may extend (radially inward) into opening 226 from each of first outer connection flange 242 and second outer connection flange 244. In particular, first piping connection bracket 270 may extend from first outer connection flange 242, and second piping connection bracket 272 may extend from second outer connection flange 244.

[0054] As shown in FIGS. 7 and 8 , each pipe connection bracket 204 may include a side wall 274 and a pair of mounting walls 276 spaced apart from each other and extending from the side wall 274. The side wall 274 may extend substantially perpendicularly from the first outer connection flange 242 (or the second outer connection flange 244). The pair of mounting walls 276 may be axially spaced apart from each other and may extend substantially perpendicularly from the side wall 274. For example, the pair of mounting walls 276 may include a first mounting wall 278 and a second mounting wall 280. The first mounting wall 278 and the second mounting wall 280 may be axially spaced apart from each other, may be substantially parallel to each other, and may each extend substantially perpendicularly from the side wall 274.

[0055] Each mounting wall of the pair of mounting walls 276 (e.g., first mounting wall 278 and second mounting wall 280) may extend generally perpendicularly from the side wall 274 to a terminal end portion. The terminal end portion may include a straight portion 284 and a contoured portion 286. The contoured portion 286 may define an arc (or a portion of a circle) that may correspond to one of the pipes or other fluid conduits in the gaseous fuel supply system 100, such that the mounting walls 276 do not interfere with the piping when the radiation shield 200 is attached to the piping connection fitting 122.

[0056] In the exemplary embodiment, each mounting wall of the pair of mounting walls 276 (e.g., first mounting wall 278 and second mounting wall 280) defines an aperture 290. The aperture 290 may be sized to accommodate the diameter of the fastener 134 such that the fastener 134 can extend through the aperture 290 in the first mounting wall 278, the tubing connection fitting 122, and the aperture 290 in the second mounting wall 280 to couple the shield portion 205 to the tubing connection fitting 122. In many embodiments, the aperture 290 may be circular. In various embodiments, the aperture 290 in the first mounting wall 278 may be aligned with the aperture 290 in the second mounting wall 280 such that a common axis can extend through the center points of both apertures 290 in the pair of mounting walls 276.

[0057] In many embodiments, as shown, the first inner connection flange 236 and the second inner connection flange 238 may each include a pair of tabs 254 disposed on opposite sides of the insulation 232 and in contact with the insulation 232. For example, the first pair of tabs 254 may extend generally perpendicularly from the first inner connection flange 236, and the second pair of tabs 254 may extend generally perpendicularly from the second inner connection flange 238. Each pair of tabs 254 may include a first tab 256 and a second tab 258 spaced apart (e.g., axially spaced apart) from the first tab 256. The first tab 256 and the second tab 258 may be generally parallel to each other and disposed on opposite sides of the insulation 232.

[0058] In various embodiments, the shield portion 205 of the radiation shield 200 may include one or more support brackets 260 coupled to the outer arcuate portion 246 and the inner arcuate portion 240. The support bracket 260 may include an axial portion 262 and a radial portion 264. The axial portion 262 may extend along the outer arcuate portion 246, and the radial portions 264 may extend generally radially from the axial portion 262 on either side of the insulation 232. The support bracket 260 may be coupled to the shield portion 205 via fasteners 266 (e.g., threaded fasteners such as nuts and bolts). For example, the fasteners 266 may extend through the axial portion 262, the outer arcuate portion 246, the insulation 232, and the inner arcuate portion 240 of the support bracket 260. The support bracket 260 may be positioned equidistant between the first flanged end 215 and the second flanged end 217. That is, the brackets may be positioned 90 degrees from the first flanged end 215 and / or the second flanged end 217 relative to the axial centerline 201. This positioning advantageously improves the structural integrity of the radiation shield 200 and prevents the insulation 232 from shifting or falling out from between the inner shell 228 and the outer shell 230.

[0059] In various embodiments, the insulation 232 may be wool-type pipe insulation. In particular, the insulation 232 may be mandrel-wound mineral wool pipe insulation with a thermosetting resin binder that can advantageously insulate in environments up to about 1200°F (about 650°C). Alternatively or additionally, the insulation 232 may be fiberglass-type insulation. In such embodiments, the insulation may include "E" type glass fibers needled together into a mat form.

[0060] The radiation shield 200 disclosed herein advantageously prevents or blocks thermal radiation from the piping connection fitting 122 from damaging other components within the enclosure 106. In particular, the radiation shield 200 advantageously prevents thermal damage to electrical components within the enclosure 106 while providing adequate clearance between the radiation shield 200 and the piping connection fitting 122 for proper ventilation, thereby reducing the risk of fuel gases becoming trapped between the piping connection fitting 122 and the radiation shield 200. Attaching the radiation shield 200 directly to the piping connection fitting 122 reduces the amount of space required for the radiation shield 200, allowing it to be installed in tight spaces and eliminates the need for external structural support for the radiation shield 200, thereby reducing manufacturing costs and the time required to install the radiation shield 200.

[0061] This specification uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they contain structural elements that do not differ from the literal language of the claims, or if they contain equivalent structural elements that do not differ substantially from the literal language of the claims.

[0062] Further aspects of the invention are provided by the subject matter of the following clauses.

[0063] 1. A radiation shield for blocking radiation at a gas turbine pipe connection joint, the radiation shield comprising at least two shield sections contacting each other at a pair of flanged ends, the at least two shield sections collectively defining an opening such that the radiation shield is configured to surround the gas turbine pipe connection joint, each shield section of the at least two shield sections comprising an inner shell, an outer shell, and insulation disposed between the inner shell and the outer shell, one of the inner shell or the outer shell comprising a pipe connection bracket extending into the opening for coupling the radiation shield to the gas turbine pipe connection joint.

[0064] The radiation shield of any one or more of these clauses, wherein the insulation is disposed entirely within the radiation shield between the inner shell and the outer shell, and the radiation shield is sized to provide a gap between the inner shell of each of the at least two shield sections and a gas turbine piping connection fitting.

[0065] The radiation shield described in one or more of these clauses, wherein the piping connection bracket comprises a side wall and a pair of mounting walls spaced apart from one another and extending from the side wall, each mounting wall of the pair of mounting walls defining a hole.

[0066] The radiation shield of any one or more of these clauses, wherein the pair of flanged ends comprises a first flanged end and a second flanged end, the second flanged end being opposite the first flanged end.

[0067] The radiation shield of any one or more of these clauses, wherein the outer shell further comprises a first outer connection flange at the first flanged end, a second outer connection flange at the second flanged end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange.

[0068] The radiation shield according to one or more of these clauses, wherein the pipe connection bracket is a first pipe connection bracket, the first pipe connection bracket extending from the first outer connection flange, and the second pipe connection bracket extending from the second outer connection flange.

[0069] The radiation shield of any one or more of these clauses, wherein the radiation shield comprises one or more support brackets coupled to the outer arcuate portion.

[0070] The radiation shield of any one or more of these clauses, wherein the inner shell further comprises a first inner connection flange at the first flanged end, a second inner connection flange at the second flanged end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

[0071] The radiation shield according to any one or more of these clauses, wherein the first inner connection flange and the second inner connection flange are each disposed on opposite sides of the insulation and include a pair of tabs that contact the insulation.

[0072] 1. A gaseous fuel supply system for a gas turbine engine, the gaseous fuel supply system comprising: a gaseous fuel supply; an accessory system fluidly coupled to a plurality of combustion cans in a combustion section of the gas turbine engine; an enclosure; a gas fuel circuit at least partially disposed within the enclosure, the gas fuel circuit fluidly coupled to the gaseous fuel supply and to the accessory system, the gas fuel circuit comprising a piping connection fitting within the enclosure; and a radiation shield surrounding the piping connection fitting, the radiation shield comprising at least two shield sections contacting each other at a pair of flanged ends, the at least two shield sections collectively defining an opening, each shield section of the at least two shield sections comprising an inner shell, an outer shell, and insulation disposed between the inner and outer shells, one of the inner shell or the outer shell comprising a piping connection bracket extending into the opening and coupling the radiation shield to the piping connection fitting.

[0073] The gaseous fuel supply system of any one or more of these clauses, wherein the gaseous fuel circuit further comprises a manifold, a branch line extending from the manifold to a piping connection fitting, a pump line extending from the piping connection fitting, and an outlet line extending from the pump line to an accessory system.

[0074] 10. The gaseous fuel supply system of claim 1, wherein the electrical equipment, electrical wiring, ventilation system, and gas detection system are disposed within the enclosure.

[0075] A gaseous fuel supply system according to one or more of these clauses, wherein the insulation is disposed entirely within the radiation shield between the inner shell and the outer shell, and the radiation shield is sized to provide a gap between the inner shell of each of the at least two shield sections and a piping connection fitting.

[0076] The gaseous fuel supply system of any one or more of these clauses, wherein the piping connection bracket comprises a side wall and a pair of mounting walls spaced apart from each other and extending from the side wall, each mounting wall of the pair of mounting walls defining a hole.

[0077] The gaseous fuel supply system of any one or more of these clauses, wherein the pair of flanged ends comprises a first flanged end and a second flanged end, the second flanged end being opposite the first flanged end.

[0078] The gaseous fuel supply system of any one or more of these clauses, wherein the outer shell further comprises a first outer connection flange at the first flanged end, a second outer connection flange at the second flanged end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange.

[0079] The gaseous fuel supply system of any one or more of these clauses, wherein the piping connection bracket is a first piping connection bracket, the first piping connection bracket extending from the first outer connection flange, and the second piping connection bracket extending from the second outer connection flange.

[0080] The gaseous fuel supply system of any one or more of these clauses, wherein the radiation shield comprises one or more support brackets coupled to the outer arcuate portion.

[0081] The gaseous fuel supply system of any one or more of these clauses, wherein the inner shell further comprises a first inner connection flange at the first flanged end, a second inner connection flange at the second flanged end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

[0082] The gaseous fuel supply system of any one or more of these clauses, wherein the first inner connection flange and the second inner connection flange are each disposed on opposite sides of the insulation and include a pair of tabs that contact the insulation. [Explanation of symbols]

[0083] 10. Gas turbine engine 12 Entrance 14 Compressor section 16 Combustion section 17 Combustion can 18 Turbine section 20 Exhaust section 22 shaft 24 rotor disc 28 rotor disc 26 rotor blades 30 rotor blades 31 outer casing 32 Hot gas path 34 Combustion Gas 100 Gaseous fuel supply system 101 beds 102 Gaseous fuel supply unit 104 Accessory Systems 105 Internal 106 Enclosure 107 Wall 108 Gas Fuel Circuit 110 Entrance Line 111 Exit Line 112 connection lines 114 Distribution Ring 116 Connection flange 118 Manifold 120 Branch Line 122 Piping connection fittings 123 Outermost surface 124 Pump Line 125 Pump 127 outermost diameter 130 First flange 132 Second flange 134 Fasteners 266 Fasteners 150 Ventilation System 152 Pump 154 Gas Detection Systems 156 Sensors 158 Electrical Equipment 160 Electric wire 200 Radiation Shield 201 Axial center line 204 Pipe connection bracket 205 Shield part 210 Inner shield part (first shield part) 212 outer shield part (second shield part) 214 flanged end 215 first flanged end 217 Second flanged end 226 Opening 227 inner diameter 228 Inner Shell 230 outer shell 232 Insulation 234 Gap 236 first inner connecting flange 238 Second inner connecting flange 240 Medial arcuate section 242 first outer connecting flange 244 Second outer connecting flange 246 Lateral arc 250 First End 252 Second End 254 tabs 256 First Tab 258 Second Tab 260 Support Bracket 262 Axial section 264 Radial section 270 First pipe connection bracket 272 Second pipe connection bracket 274 Side wall 276 Mounting wall 278 First Mounting Wall 280 Second Mounting Wall 284 Straight section 286 Contour 290 holes 300 Controller

Claims

1. A radiation shield (200) for blocking radiation at a gas turbine pipe connection joint (122), the radiation shield comprising: the radiation shield (200) comprises at least two shield portions (210, 212) contacting each other at a pair of flanged ends (215, 217), the at least two shield portions (210, 212) collectively defining an opening (226) such that the radiation shield (200) is configured to surround a gas turbine piping connection joint (122), and each shield portion of the at least two shield portions (210, 212) comprises: an inner shell (228); an outer shell (230); a thermal insulator (232) disposed between the inner shell (228) and the outer shell (230); One of the inner shell (228) or the outer shell (230) extends into the opening (226) and includes a piping connection bracket (204) for coupling the radiation shield (200) to the gas turbine piping connection fitting (122).

2. 2. The radiation shield of claim 1, wherein the thermal insulation is disposed entirely within the radiation shield between the inner shell and the outer shell, and the radiation shield is sized to provide a gap between the inner shell of each of the at least two shield sections and the gas turbine piping connection joint.

3. 2. The radiation shield (200) of claim 1, wherein the pipe connection bracket (204) comprises a side wall (274) and a pair of mounting walls (278, 280) spaced apart from one another and extending from the side wall (274), each mounting wall of the pair of mounting walls (278, 280) defining an aperture (290).

4. 2. The radiation shield (200) of claim 1, wherein the pair of flanged ends (215, 217) comprises a first flanged end (215) and a second flanged end (217), the second flanged end (217) facing the first flanged end (215).

5. 5. The radiation shield (200) of claim 4, wherein the outer shell (230) further comprises a first outer connection flange (242) at the first flanged end (215), a second outer connection flange (244) at the second flanged end (217), and an outer arcuate portion (246) extending between the first outer connection flange (242) and the second outer connection flange (244).

6. 6. The radiation shield (200) of claim 5, wherein the piping connection bracket (204) is a first piping connection bracket (270), the first piping connection bracket (270) extending from the first outer connection flange (242), and a second piping connection bracket (272) extending from the second outer connection flange (244).

7. The radiation shield (200) of claim 5, wherein the radiation shield (200) comprises one or more support brackets (260) coupled to the outer arcuate portion (246).

8. 2. The radiation shield of claim 1, wherein the inner shell further comprises a first inner connection flange at the first flanged end, a second inner connection flange at the second flanged end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

9. 9. The radiation shield (200) of claim 8, wherein the first inner connection flange (236) and the second inner connection flange (238) each include a pair of tabs (256, 258) disposed on opposite sides of the insulation material (232) and in contact with the insulation material (232).

10. A gaseous fuel supply system (100) for a gas turbine engine (10), the gaseous fuel supply system (100) comprising: a gaseous fuel supply (102); an accessory system (104) fluidly coupled to a plurality of combustion cans (17) within a combustion section (16) of the gas turbine engine (10); an enclosure (106); a gas fuel circuit (108) at least partially disposed within the enclosure (106), the gas fuel circuit (108) fluidly coupled to the gas fuel supply (102) and to the accessory system (104), the gas fuel circuit (108) comprising a piping connection fitting (122) within the enclosure (106); and A radiation shield (200) surrounding the pipe connection joint (122), the radiation shield comprising at least two shield portions (210, 212) contacting each other at a pair of flanged ends (215, 217), the at least two shield portions (210, 212) collectively defining an opening (226), and each shield portion of the at least two shield portions (210, 212) comprising: an inner shell (228); an outer shell (230); a thermal insulator (232) disposed between the inner shell (228) and the outer shell (230); One of the inner shell (228) or the outer shell (230) includes a piping connection bracket (204) extending into the opening (226) and coupling the radiation shield (200) to the piping connection fitting (122). A gaseous fuel supply system (100) comprising: a radiation shield (200).

11. 11. The gaseous fuel supply system of claim 10, wherein the gas fuel circuit further comprises: a manifold; a branch line extending from the manifold to the piping connection joint; a pump line extending from the piping connection joint; and an outlet line extending from the pump line to the auxiliary system.

12. The gaseous fuel supply system (100) of claim 10, wherein an electrical device (158), electrical wiring (160), a ventilation system (150), and a gas detection system (154) are disposed within the enclosure (106).

13. 11. The gaseous fuel supply system of claim 10, wherein the insulation material is disposed entirely within the radiation shield between the inner shell and the outer shell, and the radiation shield is sized to provide a gap between the inner shell of each of the at least two shield portions and the piping connection fitting.

14. 11. The gaseous fuel supply system of claim 10, wherein the pipe connection bracket comprises a side wall and a pair of mounting walls spaced apart from each other and extending from the side wall, each mounting wall of the pair of mounting walls defining an aperture.

15. 11. The gaseous fuel supply system of claim 10, wherein the pair of flanged ends comprises a first flanged end and a second flanged end, the second flanged end facing the first flanged end.

16. 16. The gaseous fuel supply system of claim 15, wherein the outer shell further comprises a first outer connection flange at the first flanged end, a second outer connection flange at the second flanged end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange.

17. 17. The gaseous fuel supply system of claim 16, wherein the piping connection bracket is a first piping connection bracket extending from the first outer connection flange and a second piping connection bracket extending from the second outer connection flange.

18. The gaseous fuel supply system (100) of claim 16, wherein the radiation shield (200) comprises one or more support brackets (260) coupled to the outer arcuate portion (246).

19. 11. The gaseous fuel supply system of claim 10, wherein the inner shell further comprises a first inner connection flange at the first flanged end, a second inner connection flange at the second flanged end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

20. 20. The gaseous fuel supply system (100) of claim 19, wherein the first inner connection flange (236) and the second inner connection flange (238) each include a pair of tabs (254) disposed on opposite sides of the insulation (232) and in contact with the insulation (232).

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