Radiation shield for gaseous fuel circuits

Abstract

A radiation shield assembly for blocking radiation at a gas turbine pipe connection joint is provided. The radiation shield assembly includes a radiation shield configured to surround the gas turbine pipe connection joint. The radiation shield includes at least two shield sections coupled to each other by a pair of flange joints. 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.

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 the purpose of 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 from the gas turbine as exhaust gases through the exhaust section.

[0003] A gas turbine fuel system delivers gaseous fuel to a combustion section for combustion to generate electricity. The gas fuel system typically includes gas transport manifolds and piping, gas control valves, gas stop ratio valves, and electrical components housed in a gas fuel module enclosure. Accordingly, the gas fuel module enclosure typically includes a ventilation system to exhaust gas leaks within the enclosure. Additionally, a separate leak detection system is used to detect potential 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), and detrimental radiative heat transfer can occur 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 materials (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 desirable, 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 appreciated in the art. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] China Utility Model No. 208816906 Summary of the Invention

[0008] Aspects and advantages of the radiation shield assembly 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 by practice of the present teachings.

[0009] According to one embodiment, a radiation shield assembly for blocking radiation at a gas turbine pipe connection joint is provided. The radiation shield assembly includes a radiation shield configured to surround the gas turbine pipe connection joint. The radiation shield includes at least two shield sections coupled to each other by a pair of flange joints. 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.

[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 source, an accessory system, and an enclosure. The accessory system is fluidly coupled to a plurality of combustion cans in a combustion section of the gas turbine engine. The gaseous fuel supply system further includes a gas fuel circuit at least partially disposed within the enclosure. The gas fuel circuit is fluidly coupled to the gaseous fuel supply source and to the accessory system. The gas fuel circuit includes a piping connection joint within the enclosure. The gaseous fuel supply system further includes a radiation shield surrounding the piping connection joint. The radiation shield includes at least two shield sections coupled to each other by a pair of flange joints. 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.

[0011] These and other features, aspects, and advantages of the present radiation shield assembly 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 assembly and gaseous fuel supply system, including the best mode of making and using the system and method, directed to one of ordinary skill 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] FIG. 1 illustrates a schematic diagram of a gaseous fuel supply system for a gas turbine engine according to an embodiment of the present disclosure. [Figure 3] 3 is a rear-to-front perspective view of a portion of the gas fuel circuit shown in FIG. 2 within an enclosure and radiation shield assembly according to an embodiment of the present disclosure. [Figure 4] 3 is a front-rear perspective view of a portion of the gas fuel circuit shown in FIG. 2 within an enclosure and radiation shield assembly according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a perspective view of the radiation shield assembly of FIGS. 2-4 according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is an enlarged side view of the radiation shield assembly of FIGS. 2-5, according to an embodiment of the present disclosure. [Figure 7] FIG. 7 is an enlarged perspective view of the radiation shield assembly of FIGS. 2-6, with the radiation shield assembly partially exploded, in accordance with an embodiment of the present disclosure. [Figure 8] FIG. 8 is an exploded view of a shield portion of the radiation shield of the radiation shield assembly 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 the present radiation shield assembly and gaseous fuel supply system embodiments, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the present technology, not as a limitation thereof. 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 in another embodiment to yield still a further embodiment. Accordingly, the present disclosure is intended to 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" may 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" can be a gas or a liquid. The term "fluid communication" means that a fluid is capable of making 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 fluid flow 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 electrical flow. The term "radially" refers to relative directions that are substantially perpendicular to the axial centerline of a particular component, the term "axially" refers to relative directions that are substantially parallel and / or coaxially aligned with the axial centerline of a particular component, and the term "circumferentially" refers to relative directions that extend around the axial centerline of a particular component.

[0019] Approximate terms such as "approximately," "about," "generally," and "substantially" are not intended to be limited to the exact value stated. In at least some cases, approximating 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. In at least some cases, approximating 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, approximating language can refer to within a margin of 1, 2, 4, 5, 10, 15, or 20% of a particular 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 a range of plus or minus 10 degrees of the stated angle or direction. For example, "approximately perpendicular" or "substantially perpendicular" includes directions within 10 degrees of perpendicular in any direction, e.g., clockwise or counterclockwise.

[0020] Terms such as "coupled," "fixed," and "attached," unless otherwise stated herein, refer to both direct coupling, fixing, or attachment, and indirect coupling, fixing, or attachment through one or more intermediate components or features. When a 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 comprises a list of features is not necessarily limited to only those features and may include other features not expressly listed or inherent to such process, method, article, or apparatus.

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

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

[0024] 1 shows a schematic diagram of one embodiment of a turbomachine, which in the illustrated embodiment is a gas turbine engine 10. While 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, the gas turbine engine 10 generally includes an inlet section 12, a compressor section 14 disposed downstream from the inlet section 12, a plurality of combustors (not shown) in a combustion section 16 disposed downstream from the compressor section 14, a turbine section 18 disposed downstream from the combustion section 16, and an exhaust section 20 disposed downstream from the turbine section 18. Additionally, the gas turbine 10 may include one or more shafts 22 coupled between the compressor section 14 and the 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 part of an upstream portion of a shaft 22 that extends 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 connected to each rotor disk 28. Each rotor disk 28 may in turn be coupled to or form part of a downstream portion of a shaft 22 that extends 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 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, providing compressed air 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 enter the hot gas path 32 from the combustion section 16 and into 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 can then be used to power the compressor section 14 and / or generate electricity. The combustion gases 34 from the turbine section 18 may then exit the gas turbine engine 10 as exhaust gases via the exhaust section 20.

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

[0032] In the exemplary embodiment, the gas fuel circuit 108 may include, in serial flow order, an inlet line 110, a manifold 118, a branch line 120, a pump line 124, and an outlet line 111. The inlet line 110 may extend between and fluidly couple the gas fuel source 102 and the manifold 118. The manifold 118 may extend between and fluidly couple the inlet line 110 and the branch line 120. The branch line 120 may extend between and fluidly couple the manifold 118 and the pump line 124. The pump line 124 may be a T-shaped conduit having a first end fluidly coupled to the pump 125, a second end opposite the first end and fluidly coupled to the outlet line 111, and a third end axially offset from the first and second ends and fluidly coupled to the 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] 2 , the enclosure 106 may include 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, activation of the pumps 152 removes the 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., 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 gas fuel traveling through gas fuel circuit 108 within the enclosure may be at high temperatures (e.g., from about 300°F to about 600°F, or from about 150°C to 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 enclosure wall 107 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 10 and be fluidly coupled to each of the combustion cans 17.

[0038] In the exemplary embodiment, a radiation shield assembly 200 may be disposed within the enclosure 106 (e.g., the interior 105). The radiation shield assembly 200 may surround the piping connection fitting 122 to prevent radiant heat transfer from the piping connection fitting 122 from damaging other components (such as the electrical devices 158, the electrical wires 160, etc.) within the enclosure 106. The radiation shield assembly 200 may include a radiation shield 202 and a support assembly 204.

[0039] 3 and 4, each illustrates a perspective view of a portion of the gas fuel circuit 108 within the enclosure 106 and radiation shield assembly 200, according to an embodiment of the present disclosure. As shown, the radiation shield 202 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 coupled 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 coupled (e.g., via a welded or brazed joint).

[0040] The radiation shield 202 may include at least two shield portions, for example, a first or inner shield portion 210 and a second or outer shield portion 212 coupled to one another by a pair of flange joints 214. In an exemplary embodiment, as shown, the radiation shield 202 may include a first flange end 215 and a second flange end 217. In such an embodiment, the first shield portion 210 and the second shield portion 212 may be removably coupled to one another at the first flange end 215 and the second flange end 217 via one or more fasteners 220 (such as threaded fasteners). This advantageously allows for rapid disassembly of the radiation shield 202 for repair and / or inspection of the piping connection joint 122.

[0041] The support assembly 204 can be coupled to the floor 101 (or one of the walls 107 of the enclosure 106) to keep the radiation shield 202 supported around the pipe connection joint 122. In particular, the support assembly 204 can include a support plate 206 (which can be disposed on the floor 101, another surface, or another component) and at least one support member 208 extending (substantially perpendicular) from the support plate 206. For example, the support member 208 can extend between the support plate 206 and one of the flange joints 214. In particular, the support assembly 204 can include a first support member 209 and a second support member 211. The first support member 209 can extend from a first end 222 of the support plate 206 to the first flange end 215, and the second support member 211 can extend from a second end 224 of the support plate 206 to the second flange end 217.

[0042] In many embodiments, the outlet line 111 may include a piping support bracket 136 that contacts and provides structural support to the outlet line 111. The piping support bracket 136 may include a base plate 138 and one or more walls 140 that extend from the base plate 138 to the outlet line 111. In various embodiments, the base plate 138 may be disposed on the support plate 206 of the support assembly 204. For example, the base plate 138 may be disposed on the top surface of the support plate 206 between the first support member 209 and the second support member 211.

[0043] 5-8, various views of a radiation shield assembly 200 are shown in accordance with an embodiment of the present disclosure. In particular, FIG. 5 shows a perspective view of the radiation shield assembly 200. FIG. 6 shows an enlarged side view of the radiation shield assembly 200. FIG. 7 shows an enlarged perspective view of the radiation shield assembly 200, with the radiation shield 202 partially exploded. 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 202 of the radiation shield assembly 200 in accordance with an embodiment of the present disclosure.

[0044] 5 , the radiation shield assembly 200 may define a vertical direction V, which may be oriented opposite to the direction of gravity. The support plate 206 may be substantially flat or planar, which advantageously allows the radiation shield assembly 200 to rest on or be firmly attached to the floor. That is, the planar support plate 206 may evenly distribute the weight of the radiation shield 202. In the exemplary embodiment, the first support member 209 may extend from the first end 222 of the support plate 206 to the first flange end 215, and the second support member 211 may extend from the second end 224 of the support plate 206 to the second flange end 217.

[0045] The radiation shield 202 may define a circular opening 226 and an axial centerline 201. For example, the first shield portion 210 and the second shield portion 212 may collectively define the circular opening 226. During operation, the pipe connection fitting 122 may be disposed within the circular opening 226 (shown in FIGS. 3 and 4 ). The axial centerline 201 may extend through a center point of the circular opening 226. The radiation shield 202 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.

[0046] 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 a circular opening 226. As shown in FIG. 6 (e.g., by phantom lines representing the outermost surface 123 of the piping connection fitting 122), the outermost diameter 127 of the piping connection fitting 122 may be smaller than the innermost diameter 227 of the radiation shield 202 (which is collectively defined by the inner shells 228 of the inner shield portion 210 and the outer shield portion 212).

[0047] 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 may advantageously provide ventilation (e.g., airflow) between the tubing connection fitting 122 and the radiation shield 202. In this way, if gas fuel leaks from the pipe connection fitting 122, there may be sufficient air flow to allow the fuel to vent or clear the pipe connection fitting 122 (e.g., via the ventilation system 150) without creating a risk of explosion within the enclosure 106.

[0048] 7 , the first shield portion 210 and the second shield portion 212 may be removably coupleable to each other (and to the support assembly 204) at the first flange end 215 and the second flange end 217 via one or more fasteners 220 (such as threaded fasteners). This advantageously allows for rapid disassembly of the radiation shield 202 for repair and / or inspection of the piping connection fitting 122.

[0049] The support assembly 204 may further include a connecting plate 248 fixedly coupled to each support member 209, 211. For example, the connecting plate 248 may be welded to an end of each support member 209 opposite the support plate 206. The connecting plate 248 may be substantially parallel to the flange ends 215 and 217 such that the connecting plate 248 is in flush contact (i.e., continuous contact) with the flange ends 215 and 217 and may be coupled thereto by the fasteners 220.

[0050] In the exemplary embodiment, inner shell 228 of first shield portion 210 and second shield portion 212 may include a first inner connection flange 236 at first flange end 215, a second inner connection flange 238 at second flange end 217, and an inner arcuate portion 240 extending between first inner connection flange 236 and second inner connection flange 238. Similarly, outer shell 230 of first shield portion 210 and second shield portion 212 may include a first outer connection flange 242 at first flange end 215, a second outer connection flange 244 at second flange end 217, and an outer arcuate portion 246 extending between first outer connection flange 242 and second outer connection flange 244.

[0051] The first inner connection flange 236 and the outer connection flange 242 of the first shield portion 210 and the second shield portion 212 may be stacked together to collectively form the first flange end 215 of the radiation shield 202 (shown in FIG. 8 ). For example, the first inner connection flange 236 and the outer connection flange 242 of the first shield portion 210 and the second shield portion 212 may each be shaped as flat (or planar) plates that are substantially parallel to one another so that the first inner connection flange 236 and the outer connection flange 242 may be stacked together and in flush contact with one another. In particular, the first outer connection flange 242 of the first shield portion 210, the first inner connection flange 236 of the first shield portion 210, the first inner connection flange 236 of the second shield portion 212, and the first outer connection flange 242 of the second shield portion 212 may be stacked together to collectively form a first flange end 215 (also referred to as a first stacked flange end).

[0052] Similarly, the second inner connection flange 238 and the outer connection flange 244 of the first shield portion 210 and the second shield portion 212 may be stacked together to collectively form the second flange end 217 of the radiation shield 202. For example, the second inner connection flange 238 and the outer connection flange 244 of the first shield portion 210 and the second shield portion 212 may each be shaped as flat (or planar) plates that are substantially parallel to one another so that the second inner connection flanges 238 and the outer connection flanges 244 may be stacked together and in flush contact with one another. In particular, the second outer connection flange 244 of the first shield portion 210, the second inner connection flange 238 of the first shield portion 210, the second inner connection flange 238 of the second shield portion 212, and the second outer connection flange 244 of the second shield portion 212 may be stacked together to collectively form a second flange end 217 (also referred to as a second stacked flange end).

[0053] Each of the fasteners 220 can extend through one of the flange ends 215, 217 and through the connecting plate 248 to couple the radiation shield 202 to the support assembly. In particular, each fastener 220 at the first flange end 215 can extend through the first outer connecting flange 242 of the second shield portion 212, the first inner connecting flange 236 of the second shield portion 212, the first inner connecting flange 236 of the first shield portion 210, the first outer connecting flange 242 of the first shield portion 210, and the connecting plate 248 to couple the first flange end 215 to the support assembly 204. Similarly, each fastener 220 of the second flange end 217 can extend through the second outer connection flange 244 of the second shield portion 212, the second inner connection flange 238 of the second shield portion 212, the second inner connection flange 238 of the first shield portion 210, the second outer connection flange 244 of the first shield portion 210, and the connection plate 248 to couple the second flange end 217 to the support assembly 204.

[0054] 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 end 250 and second end 252. In other words, insulation 232 may be shaped as a hollow semi-cylinder and may be disposed (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.

[0055] 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 end 250 of insulation 232. Similarly, second inner connection flange 238 may extend radially outward from inner arcuate portion 240 and across second end 252 of insulation 232. This advantageously allows insulation 232 to remain disposed between inner arcuate portion 240 and outer arcuate portion 246.

[0056] 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 and in contact with the insulation 232. For example, the first pair of tabs 254 may extend substantially perpendicularly from the first inner connection flange 236, and the second pair of tabs 254 may extend substantially 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 substantially parallel to each other and may be disposed on opposite sides of the insulation 232.

[0057] In various embodiments, the shield portion 205 of the radiation shield 202 may include one or more brackets 260 coupled to the outer arcuate portion 246 and the inner arcuate portion 240. The 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 portion 264 may extend generally radially from the axial portion 262 on either side of the insulation 232. The 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 of the bracket 260, the outer arcuate portion 246, the insulation 232, and the inner arcuate portion 240. The bracket 260 may be positioned equidistant between the first flange end 215 and the second flange end 217. That is, the brackets may be positioned 90 degrees from first flange end 215 and / or second flange end 217 relative to axial centerline 201. This positioning advantageously improves the structural integrity of radiation shield 202 and prevents insulation 232 from shifting or falling out from between inner shell 228 and outer shell 230.

[0058] In various embodiments, the insulation 232 may be a wool-type pipe insulation. In particular, the insulation 232 may be a mandrel-wound mineral wool pipe insulation having 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 a fiberglass-type insulation. In such an embodiment, the insulation may include type "E" glass fibers needled together into a mat form.

[0059] The radiation shield assembly 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 assembly 200 advantageously prevents thermal damage to electrical components within the enclosure 106 while providing adequate clearance between the radiation shield 202 and the piping connection fitting 122 for proper ventilation, thereby mitigating the risk of fuel gases being trapped between the piping connection fitting 122 and the radiation shield 202.

[0060] This written description uses examples to disclose the invention, including the best mode, and to enable any person skilled in the art to practice the invention, including making and using any device or system 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 include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements that have no substantial differences from the literal language of the claims.

[0061] Further aspects of the invention are provided by the subject matter of the following clauses.

[0062] A radiation shield assembly for blocking radiation at a gas turbine pipe connection joint, the radiation shield assembly including a radiation shield configured to surround the gas turbine pipe connection joint, the radiation shield including at least two shield portions connected to each other by a pair of flange joints, and each shield portion of the at least two shield portions including an inner shell, an outer shell, and a thermal insulator disposed between the inner shell and the outer shell.

[0063] The radiation shield assembly 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 clearance between the inner shell of each of the at least two shield portions and a gas turbine piping connection fitting.

[0064] The radiation shield assembly of any one or more of these clauses, further comprising a support assembly including a support plate and at least one support member coupled to the radiation shield, the at least one support member extending between the support plate and one of a pair of flange joints of the radiation shield.

[0065] The radiation shield assembly of any one or more of these clauses, wherein the pair of flange joints comprises a first flange end and a second flange end, the second flange end being opposite the first flange end.

[0066] A radiation shield assembly according to any one or more of these clauses, wherein the inner shell further comprises a first inner connection flange at the first flange end, a second inner connection flange at the second flange end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

[0067] The radiation shield assembly of any one or more of these clauses, wherein the first inner connection flange and the second inner connection flange extend radially outward across the insulation.

[0068] A radiation shield assembly according to 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 are provided with a pair of tabs that contact the insulation.

[0069] The radiation shield assembly of any one or more of these clauses, wherein the outer shell further comprises a first outer connection flange at the first flange end, a second outer connection flange at the second flange end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange.

[0070] A radiation shield assembly according to one or more of these clauses, wherein the first outer connection flange is coupled to the first inner connection flange and the second outer connection flange is coupled to the second inner connection flange.

[0071] The radiation shield assembly of any one or more of these clauses, wherein the radiation shield includes one or more support brackets coupled to the outer arcuate portion and the inner arcuate portion.

[0072] 1. A gaseous fuel supply system for a gas turbine engine, the gaseous fuel supply system comprising: a gaseous fuel source; 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 gas fuel source and to the accessory system, the gas fuel circuit including a piping connection fitting within the enclosure; and a radiation shield surrounding the piping connection fitting, the radiation shield comprising at least two shield portions coupled to each other by a pair of flange fittings, each shield portion of the at least two shield portions comprising an inner shell, an outer shell, and insulation disposed between the inner shell and the outer shell.

[0073] A gaseous fuel supply system according to one or more of these clauses, wherein the gas 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] The gaseous fuel supply system of any one or more of these clauses, wherein the electrical equipment, electrical wiring, ventilation system, and gas detection system are disposed within the enclosure.

[0075] The gaseous fuel supply system 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 clearance between the inner shell of each of the at least two shield portions and a gas turbine piping connection fitting.

[0076] The gaseous fuel supply system of any one or more of these clauses, further comprising a support assembly including a support plate and at least one support member coupled to the radiation shield, the at least one support member extending between the support plate and one of a pair of flange joints of the radiation shield.

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

[0078] 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 flange end, a second inner connection flange at the second flange end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

[0079] 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 extend radially outward across the insulation.

[0080] A gaseous fuel supply system according to 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 have a pair of tabs that contact the insulation.

[0081] 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 flange end, a second outer connection flange at the second flange end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange. [Explanation of symbols]

[0082] 10 Gas turbine engines, gas turbines 12 Entrance Section 14 Compressor Section 16 Combustion Section 17 Combustion can 18 Turbine Section 20 Exhaust Section 22 shaft 24 rotor disc 26 rotor blades 28 rotor disc 30 rotor blades 31 outer casing 32 Hot gas path 34 Combustion Gas 100 Gaseous fuel supply system 101 beds 102 Gaseous fuel supply source 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 136 Pipe support bracket 138 base plate 140 Wall 150 Ventilation System 152 Pump 154 Gas Detection Systems 156 Sensors 158 Electrical Equipment 160 Electric wire 200 Radiation Shield Assembly 201 Axial center line 202 Radiation Shield 204 Support Assembly 205 Shield part 206 Planar support plate 206 Support Plate 208 Support member 209 First support member 209 Support member 210 inner shield portion, first shield portion 211 second support member, support member 212 outer shield portion, second shield portion 214 Flange joint 215 first flange end 215 flange end 217 Second flange end 217 Flange end 220 Fasteners 222 first end 224 Second End 226 Circular 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 part 242 first outer connecting flange 244 Second outer connecting flange 246 Outer arcuate part 248 Connecting Plate 250 first end 252 Second End 254 tabs 256 First Tab 258 Second Tab 260 Bracket 262 Axial section 264 Radial part 266 Fasteners 300 Controller

Claims

1. A radiation shield assembly (200) for blocking radiation at a gas turbine pipe connection joint (122), the radiation shield assembly (200) comprising: a radiation shield (202) configured to surround the gas turbine pipe connection joint (122), the radiation shield (202) comprising at least two shield portions (210, 212) coupled to each other by a pair of flange joints (214), each 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); A radiation shield assembly (200) comprising:

2. 2. The radiation shield assembly 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 clearance between the inner shell of each of the at least two shield portions and the gas turbine piping connection joint.

3. 2. The radiation shield assembly (200) of claim 1, further comprising a support assembly (204) including a support plate (206) and at least one support member (208) coupled to the radiation shield (202), the at least one support member (208) extending between the support plate (206) and one of the pair of flange joints (214) of the radiation shield (202).

4. 2. The radiation shield assembly (200) of claim 1, wherein the pair of flange joints (214) comprises a first flange end (215) and a second flange end (217), the second flange end (217) being opposite the first flange end (215).

5. 5. The radiation shield assembly of claim 4, wherein the inner shell further comprises a first inner connection flange at the first flange end, a second inner connection flange at the second flange end, and an inner arcuate portion extending between the first inner connection flange and the second inner connection flange.

6. The radiation shield assembly (200) of claim 5, wherein the first inner connection flange (236) and the second inner connection flange (238) extend radially outward across the insulation (232).

7. 7. The radiation shield assembly (200) of claim 6, 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).

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

9. 9. The radiation shield assembly (200) of claim 8, wherein the first outer connection flange (242) is coupled to the first inner connection flange (236) and the second outer connection flange (244) is coupled to the second inner connection flange (238).

10. The radiation shield assembly (200) of claim 8, wherein the radiation shield (202) includes one or more support brackets coupled to the outer arcuate portion (246) and the inner arcuate portion (240).

11. 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 of the gas turbine engine (10); an enclosure (106); a gas fuel circuit (108) at least partially disposed within the enclosure (106), fluidly coupled to the gas fuel supply (102), and fluidly coupled to the accessory system (104), the gas fuel circuit (108) including a piping connection fitting (122) within the enclosure (106); A radiation shield (202) surrounding the pipe connection joint (122), the radiation shield (202) comprising at least two shield portions (210, 212) coupled to each other by a pair of flange joints (214), each 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); a radiation shield (202) comprising:

12. 12. The gaseous fuel supply system of claim 11, 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.

13. The gaseous fuel supply system (100) of claim 11, wherein an electrical device (158), electrical wiring (160), a ventilation system (150), and a gas detection system (154) are disposed within the enclosure (106).

14. 12. The gaseous fuel supply system of claim 11, 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 clearance between the inner shell of each of the at least two shield portions and the gas turbine piping connection joint.

15. 12. The gaseous fuel supply system of claim 11, further comprising a support assembly including a support plate and at least one support member coupled to the radiation shield, the at least one support member extending between the support plate and one of the pair of flange joints of the radiation shield.

16. 12. The gaseous fuel supply system (100) of claim 11, wherein the pair of flange joints (214) comprises a first flange end (215) and a second flange end (217), the second flange end (217) being opposite the first flange end (215).

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

18. The gaseous fuel supply system (100) of claim 17, wherein the first inner connection flange (236) and the second inner connection flange (238) extend radially outward across the insulation (232).

19. 20. The gaseous fuel supply system (100) of claim 18, 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).

20. 20. The gaseous fuel supply system of claim 18, wherein the outer shell further comprises a first outer connection flange at the first flange end, a second outer connection flange at the second flange end, and an outer arcuate portion extending between the first outer connection flange and the second outer connection flange.

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