Gas mixer, gas turbine equipment, and gas mixing method

Abstract

To provide a gas mixer that can improve the mixing properties of two types of gases while miniaturizing and reducing manufacturing costs. [Solution] The gas mixer comprises a T-pipe fitting and an elbow pipe fitting. The T-pipe fitting has a straight pipe section extending in the direction of the straight pipe axis and a confluence pipe section extending in the direction of the confluence pipe axis. The straight pipe section has a first inlet opening on the first side and a second inlet opening on the second side in the direction of the straight pipe axis. The confluence pipe section has an outlet opening on the opposite side from the connection point with the straight pipe section. The elbow pipe fitting has an inlet opening on one side and a connection opening on the other side in the direction along the curved axis. The curved axis is curved in a virtual plane including the straight pipe axis and the confluence pipe axis, and the connection opening of the elbow pipe fitting is connected to the first inlet opening of the T-pipe fitting so that the first gas flowing into the elbow pipe fitting flows into the T-pipe fitting and mixes with the second gas flowing into the T-pipe fitting in the confluence pipe section.

Description

Technical Field

[0006] , , ,

[0005] , , ,

[0001] The present disclosure relates to a gas mixer capable of mixing two types of gases, a gas turbine facility including this gas mixer, and a method for mixing two types of gases.

Background Art

[0002] Patent Document 1 below discloses a technique of combining a hydrocarbon gas and a hydrogen gas and supplying a mixed gas in which the hydrocarbon gas and the hydrogen gas are mixed to a gas turbine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The gas mixer is required to enhance the miscibility of two types of gases. Further, miniaturization and reduction of manufacturing costs are desired for the gas mixer.

[0005] Therefore, an object of the present disclosure is to provide a gas mixer, a gas turbine facility including this gas mixer, and a method for mixing gases using this gas mixer, which can enhance the miscibility of two types of gases while achieving miniaturization and suppression of manufacturing costs.

Means for Solving the Problems

[0006] To solve the above problems, the gas mixer according to the present disclosure comprises a T-pipe fitting and an elbow pipe fitting, the T-pipe fitting having a cylindrical shape around a straight pipe axis and a straight pipe section extending in the direction of the straight pipe axis along the straight pipe axis, and a confluence pipe section having a cylindrical shape around a confluence pipe axis intersecting the straight pipe axis and extending in the direction of the confluence pipe axis along the confluence pipe axis and communicating with the straight pipe section, the straight pipe section having a first side in the direction of the straight pipe axis and a second side opposite to the first side, with a first inlet opening opening at the end of the first side and a second inlet opening opening at the end of the second side, the confluence pipe section having an end opposite to the connection position with the straight pipe section in the direction of the confluence pipe axis The elbow pipe fitting has an outlet opening that is open in a certain direction, and the elbow pipe fitting is cylindrical around the curved axis and has an inlet opening that is open at one end in the direction along the curved axis and a connecting opening that is open at the other end in the direction along the curved axis, and the curved axis is curved in a virtual plane including the straight pipe axis and the confluence pipe axis, and the connecting opening of the elbow pipe fitting is connected to the first inlet opening of the T pipe fitting so that the first gas that flows into the elbow pipe fitting from the inlet opening flows into the T pipe fitting from the first inlet opening via the connecting opening and mixes with the second gas that flows into the T pipe fitting from the second inlet opening in the confluence pipe section.

[0007] Furthermore, the gas turbine equipment according to this disclosure includes the above-mentioned gas mixer, a gas turbine having a combustor into which fuel can flow, a first gas line through which the first gas, which is one of the fuels, can flow and which is connected to the edge of the inlet opening of the elbow pipe fitting, a second gas line through which the second gas, which is another of the fuels, can flow and which is connected directly or indirectly to the second inlet opening of the T pipe fitting, and a mixed gas line connecting the outlet opening of the T pipe fitting and the combustor so that a mixed gas, which is a mixture of the first gas and the second gas mixed in the gas mixer, can flow into the combustor.

[0008] Furthermore, the gas mixing method according to the present disclosure includes an inflow step of introducing a first gas and a second gas into a gas mixer, and a mixing step of mixing the first gas and the second gas in the gas mixer, wherein the gas mixer comprises a T-pipe fitting and an elbow pipe fitting, the T-pipe fitting is cylindrical around a straight pipe axis and has a straight pipe section extending in the direction of the straight pipe axis along the straight pipe axis, and a confluence pipe section is cylindrical around a confluence pipe axis intersecting the straight pipe axis and extends in the direction of the confluence pipe axis along the confluence pipe axis and communicates with the straight pipe section, the straight pipe section has a first side in the direction of the straight pipe axis and a second side opposite to the first side, with a first inlet opening opening at the end of the first side and a second inlet opening opening at the end of the second side, and the confluence The pipe section has an outlet opening that is open in the direction of the axial direction of the confluence pipe, on the opposite side from the connection point with the straight pipe section. The elbow pipe joint is cylindrical around a curved axis and has an inlet opening that is open at one end in the direction along the curved axis and a connecting opening that is open at the other end in the direction along the curved axis. The curved axis is curved in a virtual plane including the axis of the straight pipe and the axis of the confluence pipe, and the connecting opening of the elbow pipe joint is connected to the first inlet opening of the T pipe joint so that the first gas flowing into the elbow pipe joint from the inlet opening flows into the T pipe joint from the first inlet opening via the connecting opening and mixes with the second gas flowing into the T pipe joint from the second inlet opening in the confluence pipe section. [Effects of the Invention]

[0009] The gas mixer, gas turbine equipment, and gas mixing method of this disclosure make it possible to improve the mixing ability of two types of gases while miniaturizing and suppressing manufacturing costs. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic cross-sectional view of a gas turbine facility in one embodiment of the present disclosure. [Figure 2] This is a plan view of a gas mixer in a first embodiment of the present disclosure. [Figure 3]This is a schematic perspective view of a gas mixer in a first embodiment of the present disclosure. [Figure 4] This flowchart shows an example of a procedure for mixing gases in a first embodiment of the present disclosure. [Figure 5] Figure 3 is an explanatory diagram showing the gas flow in the V-V cross-section. [Figure 6] This is a schematic perspective view of the gas mixer in the comparative example. [Figure 7] Figures 2 and 3 are explanatory diagrams showing the gas flow in the cross-section along line VII-VII. [Figure 8] Figure 6 is an explanatory diagram showing the gas flow in the section along line VIII-VIII. [Modes for carrying out the invention]

[0011] "One embodiment of a gas turbine system" As shown in Figure 1, the gas turbine equipment 1 in this embodiment includes a gas turbine GT and a fuel supply device 20 capable of supplying fuel to the gas turbine GT.

[0012] <Gas Turbine> The gas turbine GT comprises a compressor 10 capable of compressing air A to produce compressed air Acom, a plurality of combustors 19 capable of burning fuel F in the compressed air Acom to produce combustion gas CG, and a turbine 15 that can be driven by the combustion gas CG.

[0013] The compressor 10 includes a compressor rotor 11 that rotates around the rotor axis Ar, and a compressor casing 12 that covers the compressor rotor 11. The turbine 15 includes a turbine rotor 16 that rotates around the rotor axis Ar, and a turbine casing 17 that covers the turbine rotor 16. In the following, the direction in which the rotor axis Ar extends will be referred to as the rotor axis direction Da, one side of this rotor axis direction Da will be referred to as the upstream axis side Dau, and the other side as the downstream axis side Da.

[0014] The compressor 10 is arranged on the upstream side Dau with respect to the turbine 15 in the axial direction. The compressor rotor 11 and the turbine rotor 16 are located on the same rotor axis Ar and are connected to each other to form the gas turbine rotor 2. For example, the rotor of the generator GEN is connected to this gas turbine rotor 2.

[0015] The gas turbine GT further includes an intermediate casing 3 arranged between the compressor casing 12 and the turbine casing 17. Compressed air Acom from the compressor 10 flows into this intermediate casing 3. A plurality of combustors 19 are attached to this intermediate casing 3.

[0016] A fuel supply device 20 is connected to the combustor 19. The combustor 19 can burn the fuel F from this fuel supply device 20 in the compressed air Acom from the compressor 10 to generate combustion gas CG.

[0017] <Fuel supply device> The fuel supply device 20 includes a first gas line 21 through which a first gas F1, which is one type of the fuel F, can flow, a first gas control valve 22 capable of adjusting the flow rate of the first gas F1 flowing through the first gas line 21, a second gas line 23 through which a second gas F2, which is another type of the fuel F, can flow, a second gas control valve 24 capable of adjusting the flow rate of the second gas F2 flowing through the second gas line 23, a gas mixer 30 capable of mixing the first gas F1 from the first gas line 21 and the second gas F2 from the second gas line 23, and a mixed gas line 25 for guiding the gas from the gas mixer 30 to the plurality of combustors 19. Note that in the present disclosure, the first gas F1 is hydrogen and the second gas F2 is natural gas, but it is not limited thereto.

[0018] Note that the fuel supply device 20 according to the present disclosure does not include a mechanism for adjusting the flow rate of the gas flowing through the mixed gas line 25. Also, the first gas line 21, the second gas line 23, and the mixed gas line 25 are all capable of allowing the flow of not only a specific fuel F but also other substances. For example, the second gas F2 may flow through the first gas line 21, or the first gas F1 or the second gas F2 may flow through the mixed gas line 25. Hereinafter, the gas mixer 30 and the gas mixing method S0 using the same will be described.

[0019] "First Embodiment of Gas Mixer and Gas Mixing Method" The first embodiment of the gas mixer 30 and the gas mixing method S0 will be described with reference to FIGS. 2 to 4.

[0020] <Gas Mixer> The first embodiment of the gas mixer 30 will be described with reference to FIGS. 2 and 3.

[0021] As shown in FIG. 2, the gas mixer 30 in the first embodiment includes a T-joint 40, an elbow joint 50, and a connecting straight pipe 60. Note that the T-joint 40 and the elbow joint 50 are pipe joints standardized according to industrial standards such as JIS and ISO. FIG. 3 shows a schematic perspective view of the gas mixer 30 in the first embodiment.

[0022] <T-Joint> The T-joint 40 allows the flow of fuel F. The T-joint 40 includes a straight pipe portion 41 and a confluence pipe portion 45.

[0023] <Straight Pipe Portion> The straight pipe section 41 is cylindrical around the straight pipe axis As. The straight pipe section 41 extends in the direction Ds of the straight pipe axis. The direction Ds of the straight pipe axis is the direction along the straight pipe axis As. One side of this direction Ds of the straight pipe axis is called the first side Dsf, and the other side is called the second side Dss. The straight pipe section 41 has a first inlet opening 42 and a second inlet opening 43. The first inlet opening 42 opens at the end of the first side Dsf in the direction Ds of the straight pipe axis. The second inlet opening 43 opens at the end of the second side Dss in the direction Ds of the straight pipe axis.

[0024] <Confluence pipe section> The confluence pipe section 45 is cylindrical around the confluence pipe axis Aj. The confluence pipe section 45 extends in the direction Dj of the confluence pipe axis. The confluence pipe axis Aj intersects with the straight pipe axis As. The direction Dj of the confluence pipe axis is along the confluence pipe axis Aj. In the first embodiment, the confluence pipe axis Aj is perpendicular to the straight pipe axis As.

[0025] The confluence pipe section 45 is connected to and communicates with the straight pipe section 41. The confluence pipe section 45 is connected to the straight pipe section 41 at an intermediate position in the straight pipe axial direction Ds of the straight pipe section 41. The confluence pipe section 45 has an outlet opening 46 that opens in the confluence pipe axial direction Dj, on the opposite side from the connection point with the straight pipe section 41. The edge of the outlet opening 46 is connected to and communicates with the mixed gas line 25.

[0026] <Elbow pipe fittings> The elbow pipe fitting 50 is cylindrical around a curved axis Ac. The curved axis Ac extends within a virtual plane Pv that includes the straight pipe axis As and the junction pipe axis Aj. The curved axis Ac is curved within the virtual plane Pv. The elbow pipe fitting 50 has an inlet opening 52 and a connecting opening 53. The inlet opening 52 is open at one end in the direction along the curved axis Ac. The connecting opening 53 is open at the other end in the direction along the curved axis Ac.

[0027] The elbow pipe fitting 50 is connected to the T pipe fitting 40 and the first gas line 21. Specifically, the edge of the connection opening 53 of the elbow pipe fitting 50 is directly connected to the edge of the first inlet opening 42 of the T pipe fitting 40. In addition, the elbow pipe fitting 50 is connected to and communicates with the first gas line 21 at the edge of the inlet opening 52. With this structure, the fuel F can flow as follows: The first gas F1 flows into the elbow pipe fitting 50 from the inlet opening 52. The first gas F1 that has flowed into the elbow pipe fitting 50 flows into the T pipe fitting 40 from the first inlet opening 42 via the connection opening 53. The first gas F1 that has flowed into the T pipe fitting 40 can be mixed with the second gas F2 that has flowed into the T pipe fitting 40 from the second inlet opening 43 in the junction pipe section 45.

[0028] Furthermore, the elbow pipe fitting 50 and the bending axis Ac are bent as follows: The direction from the inside of the elbow pipe fitting 50 toward the connection opening 53 is 90° to the direction from the inside of the elbow pipe fitting 50 toward the inlet opening 52. That is, the bending axis Ac extends within a virtual plane Pv that includes the straight pipe axis As and the confluence pipe axis Aj, and is bent at 90° within the virtual plane Pv. In addition, the elbow pipe fitting 50 of the first embodiment is bent toward the opposite side from the side where the confluence pipe section 45 is connected to the straight pipe section 41 in the T pipe fitting 40.

[0029] <Connecting straight pipe> The connecting straight pipe 60 is cylindrical around the straight pipe axis As. The connecting straight pipe 60 extends in the direction of the straight pipe axis Ds. The connecting straight pipe 60 has a connecting straight pipe inlet opening 62 and a connecting straight pipe outlet opening 61. The connecting straight pipe inlet opening 62 opens at the end of the second side Dss in the direction of the straight pipe axis Ds. The connecting straight pipe outlet opening 61 opens at the end of the first side Dsf in the direction of the straight pipe axis Ds.

[0030] The connecting straight pipe 60 is connected to the T-pipe fitting 40 and the second gas line 23. Specifically, the edge of the connecting straight pipe outlet opening 61 is directly connected to the edge of the second inlet opening 43 of the T-pipe fitting 40. In addition, the connecting straight pipe 60 is connected to and communicates with the second gas line 23 at the edge of the connecting straight pipe inlet opening 62.

[0031] Furthermore, according to the first embodiment, the distance L from the connecting straight pipe inlet opening 62 to the intermediate position of the straight pipe section 41 in the straight pipe axial direction Ds of the connecting straight pipe 60 is 10 times or more the inner diameter of the connecting straight pipe 60.

[0032] <Method of mixing gases> The gas mixing method S0 in the first embodiment will be described with reference to Figures 4 and 5.

[0033] The gas mixing method S0 in the first embodiment will be explained according to the flowchart shown in Figure 4. The gas mixing method S0 in the first embodiment is a method of mixing the first gas F1 and the second gas F2 using the gas mixer 30 described above. The gas mixing method S0 in the first embodiment includes an inflow step S2 and a mixing step S3.

[0034] <Inflow process> First, the inflow process S2 is performed. In this inflow process S2, the first gas F1 and the second gas F2 are introduced into the gas mixer 30.

[0035] The first gas F1 flows through the first gas line 21 and into the gas mixer 30. The first gas F1 flows from the first gas line 21 into the elbow pipe fitting 50 and is bent 90° in its direction of travel along the bending axis Ac in a virtual plane Pv. The first gas F1 flows from the elbow pipe fitting 50 into the straight pipe section 41 of the T pipe fitting 40. Figure 5 shows an image of the cross-sectional flow velocity distribution of the first gas F1 in this state. The first gas F1 flows into the intersection of the confluence pipe axis Aj and the straight pipe axis As, with the portion with the highest flow velocity biased towards the side of the cross-section of the straight pipe section 41 where the confluence pipe section 45 is connected. In other words, the first gas F1 flows into the confluence pipe section 45 with a biased flow velocity distribution after entering the elbow pipe fitting 50.

[0036] Secondary gas F2 flows through the second gas line 23 and into the gas mixer 30. Secondary gas F2 flows from the second gas line 23 through the connecting straight pipe 60 into the straight pipe section 41 of the T-pipe joint 40. Secondary gas F2 flows into the intersection of the confluence pipe axis Aj and the straight pipe axis As in a manner that prevents uneven distribution of flow velocity. That is, secondary gas F2 flows into the intersection of the confluence pipe axis Aj and the straight pipe axis As with the greatest flow velocity at the center of the straight pipe section 41, and the flow velocity decreases as it approaches the pipe wall of the straight pipe section 41.

[0037] <Mixing process> After the inflow process S2 is performed, the mixing process S3 is executed. In this mixing process S3, the first gas F1 and the second gas F2 are mixed in the gas mixer 30. The first gas F1 and the second gas F2 that flowed into the gas mixer 30 in the inflow process S2 merge in a straight line at the point where the confluence pipe axis Aj and the straight pipe axis As intersect, and flow into the confluence pipe section 45.

[0038] Before explaining the effects of the first embodiment, we will describe the comparative examples.

[0039] <Comparative Example> As a comparative example of the gas mixer 30 and the gas mixing method S0 in the first embodiment, the gas mixer 30c shown in Figure 6 will be described. The comparative example, gas mixer 30c, differs from the first embodiment in the form of the elbow pipe fitting 50.

[0040] As shown in Figure 6, the gas mixer 30c comprises a T-pipe fitting 40, an elbow pipe fitting 50c, and a connecting straight pipe 60. The T-pipe fitting 40 and the connecting straight pipe 60 have the same configuration as in the first embodiment, so their description is omitted. The comparative elbow pipe fitting 50c differs in its bending direction from that of the first embodiment. The elbow pipe fitting 50c is bent in a direction perpendicular to the virtual plane Pv which includes the straight pipe axis As and the junction pipe axis Aj.

[0041] In this comparative example, the first gas F1 flowing into the gas mixer 30c is bent 90° in the direction of travel within the elbow pipe fitting 50c. The first gas F1 flows from the elbow pipe fitting 50c into the straight pipe section 41 of the T pipe fitting 40. Subsequently, the first gas F1 merges with the second gas F2 in a straight line and flows into the merging pipe section 45.

[0042] <Effects of the First Embodiment> According to the gas mixer 30, the gas turbine equipment 1 equipped with the gas mixer 30, and the gas mixing method S0 described above, two types of gases can be mixed. The gas mixer 30 is equipped with a T-pipe fitting 40 and an elbow pipe fitting 50 that are bent along a curved axis Ac. The gas mixer 30 is spread out within a virtual plane Pv. The first gas F1 introduced into such a gas mixer 30 is bent in its direction of travel along the elbow pipe fitting 50. After the direction of travel of the first gas F1 is bent by the elbow pipe fitting 50, the first gas F1 and the second gas F2 are mixed in the junction pipe section 45.

[0043] Figure 7 shows the gas flow in a cross-section of the confluence pipe 45 when the first gas F1 and the second gas F2 have merged and flowed into the confluence pipe 45. Figure 7 also shows the flow of the first gas F1 and the second gas F2, as well as the main flows FL1 and FL2, which represent the overall major flows in the cross-section, obtained from simulations. The simulations showed that the first gas F1 and the second gas F2 stably promote mixing throughout the entire volume range.

[0044] The results obtained from this simulation show that the main flows FL1 and FL2 in the cross-section of the confluence pipe section 45 are complex. Specifically, this indicates that the first gas F1 and the second gas F2 are mixed in such a way that not one but two main flows FL1 and FL2 are formed. Main flow FL1 is a flow that swirls within the confluence pipe section 45 in one region with respect to the straight pipe axis As. Main flow FL2 is a flow that swirls within the confluence pipe section 45 in the other region with respect to the straight pipe axis As. However, the direction of swirl of main flow FL2 is opposite to the direction of swirl of main flow FL1. Therefore, mixing of the first gas F1 and the second gas F2 within the confluence pipe section 45 is promoted.

[0045] Figure 8 shows the gas flow in a cross-section of the confluence pipe 45 in the gas mixer 30c described as a comparative example, when the first gas F1 and the second gas F2 have merged and flowed into the confluence pipe 45. Figure 8 also shows the flow of the first gas F1 and the second gas F2, and the main flow FL3, which is the overall main flow in the cross-section, obtained by simulation. The conditions for this simulation are the same as those of the first embodiment, except that the configuration of the gas mixer 30c is different.

[0046] In the comparative example gas mixer 30c, the main flow FL3 obtained by simulation is a single flow. Compared to the gas mixer 30 of the first embodiment, which has two main flows FL1 and FL2, the main flow FL3 in the comparative example gas mixer 30c is simpler. The more complex the main flows FL1 and FL2 are, as in the first embodiment, the more the mixing of the first gas F1 and the second gas F2 is promoted. Therefore, the gas mixer 30 of the first embodiment can shorten the distance required to completely mix the first gas F1 and the second gas F2 compared to the comparative example gas mixer 30c. In other words, the gas mixer 30 of the first embodiment can shorten the confluence pipe section 45 and the mixed gas line 25. By shortening the confluence pipe section 45 and the mixed gas line 25, it becomes possible to mix the gases at a position closer to the combustor 19.

[0047] The gas mixer 30 according to the first embodiment can be miniaturized because it can mix the first gas F1 and the second gas F2 in the manner described above. Furthermore, the gas mixer 30 of the first embodiment can promote gas mixing by biasing the flow velocity distribution of the first gas F1 using the elbow pipe fitting 50. In other words, the gas mixer 30 of the first embodiment can be constructed using the T pipe fitting 40 and the elbow pipe fitting 50, thereby reducing the manufacturing costs of the gas mixer 30 and the gas turbine equipment 1. Moreover, while miniaturizing the gas mixer 30 and the gas turbine equipment 1 and reducing manufacturing costs, it is possible to improve the mixing ability of the two types of gas as described above.

[0048] Furthermore, the gas mixer 30 according to the first embodiment further includes a connecting straight pipe 60. In the connecting straight pipe 60, the distance L from the connecting straight pipe inlet opening 62 to the midpoint of the straight pipe section 41 in the straight pipe axial direction Ds is 10 times or more the inner diameter of the connecting straight pipe 60. That is, the second gas F2 flows linearly for a distance of 10 times or more the inner diameter of the connecting straight pipe 60 before merging with the first gas F1. Thus, the second gas F2 is merged and mixed with the first gas F1 while ensuring that the flow velocity distribution is not biased.

[0049] Furthermore, according to the gas turbine equipment 1 of the first embodiment, the flow rate of the first gas F1 can be adjusted by the first gas control valve 22. The flow rate of the second gas F2 can be adjusted by the second gas control valve 24. Therefore, a mixed gas can be generated by appropriately changing the mixing ratio of the first gas F1 and the second gas F2. It is also possible to introduce only one of the first gas F1 or the second gas F2 into the combustor 19 through the mixed gas line 25.

[0050] According to the gas mixing method S0 of the first embodiment, the first gas F1 and the second gas F2 can be mixed using the gas mixer 30. Therefore, according to the gas mixing method S0 of the first embodiment, it is possible to improve the mixing ability of the two types of gases while using a miniaturized gas mixer 30.

[0051] <Other embodiments> This disclosure is not limited to the embodiments described above. Various additions, modifications, substitutions, partial deletions, etc., are possible without departing from the conceptual idea and spirit of the present invention derived from the claims and their equivalents.

[0052] For example, the gas mixer 30 in this embodiment is a mixer that mixes a first gas F1 and a second gas F2, which are types of fuel F gas supplied to the combustor 19. However, the substances to be mixed by the gas mixer 30 are not limited to fuel F gas.

[0053] Furthermore, the fuel supply device 20 in the embodiment may be equipped with a mechanism in the mixed gas line 25 that can adjust the flow rate of the gas flowing through the mixed gas line 25. For example, a mechanism similar to the first gas control valve 22 and the second gas control valve 24 in this disclosure may be provided in the mixed gas line 25.

[0054] Furthermore, the elbow pipe fitting 50 in the embodiment does not have to be bent at 90° within the virtual plane Pv that includes the straight pipe axis As and the confluence pipe axis Aj. That is, the elbow pipe fitting 50 does not have to be bent perfectly vertically, but it is sufficient if it is bent within the virtual plane Pv that includes approximately vertical and includes the straight pipe axis As and the confluence pipe axis Aj.

[0055] Furthermore, the confluence pipe axis Aj in the embodiment does not have to be perpendicular to the straight pipe axis As. That is, the confluence pipe axis Aj does not need to be perfectly perpendicular to the straight pipe axis As. The confluence pipe axis Aj only needs to extend so as to intersect with the straight pipe axis As.

[0056] Furthermore, the gas mixer 30 in the first embodiment does not necessarily have a connecting straight pipe 60. That is, in the gas mixer 30 according to the first embodiment, the second inlet opening 43 of the straight pipe section 41 and the second gas line 23 may be directly connected.

[0057] <Note> The gas mixer 30, gas turbine equipment 1, and gas mixing method S0 described in each embodiment can be understood, for example, as follows.

[0058] (1) The gas mixer 30 according to the first embodiment comprises a T-pipe fitting 40 and an elbow pipe fitting 50, wherein the T-pipe fitting 40 is cylindrical around a straight pipe axis As and has a straight pipe section 41 extending in the straight pipe axis direction Ds along the straight pipe axis As, and has a cylindrical shape around a confluence pipe axis Aj that intersects the straight pipe axis As and extends in the confluence pipe axis direction Dj along the confluence pipe axis Aj, and communicates with the straight pipe section 41. The straight pipe section 41 has a first side Dsf in the straight pipe axial direction Ds and a second side Dss on the opposite side of the first side Dsf, with a first inlet opening 42 opening at the end of the first side Dsf and a second inlet opening 43 opening at the end of the second side Dss, and the straight pipe section 45 has an end on the opposite side of the connection position with the straight pipe section 41 in the straight pipe axial direction Dj. The elbow pipe fitting 50 has an outlet opening 46 that is open, and is cylindrical around a bending axis Ac, and has an inlet opening 52 that is open at one end in the direction along the bending axis Ac, and a connecting opening 53 that is open at the other end in the direction along the bending axis Ac. The bending axis Ac is bent in a virtual plane Pv that includes the straight pipe axis As and the confluence pipe axis Aj, and the connecting opening 53 of the elbow pipe fitting 50 is connected to the first inlet opening 42 of the T pipe fitting 40 so that the first gas F1 that flows into the elbow pipe fitting 50 from the inlet opening 52 flows into the T pipe fitting 40 from the first inlet opening 42 via the connecting opening 53, and mixes with the second gas F2 that flows into the T pipe fitting 40 from the second inlet opening 43 in the confluence pipe section 45.

[0059] According to the above configuration, the gas mixer 30 comprises a T-pipe fitting 40 and a bent elbow pipe fitting 50. The gas mixer 30 extends within a virtual plane Pv that includes the straight pipe axis As and the confluence pipe axis Aj. The first gas F1 flowing into such a gas mixer 30 is bent in its direction of travel along the elbow pipe fitting 50. After the direction of travel of the first gas F1 is bent by the elbow pipe fitting 50, the first gas F1 and the second gas F2 are mixed in the confluence pipe section 45.

[0060] When the first gas F1 is bent in its direction of travel by the elbow pipe fitting 50, its velocity distribution becomes uneven. Furthermore, the elbow pipe fitting 50 has a connection opening 53 that is connected to the first inlet opening 42 of the T-pipe fitting 40. As a result, the first gas F1 merges with the second gas F2 while maintaining its uneven velocity distribution. Therefore, the cross-sectional flow after the first gas F1 and second gas F2 merge becomes complex, promoting gas mixing.

[0061] The gas mixer 30 in this configuration can be miniaturized by being constructed using a T-pipe fitting 40 and an elbow pipe fitting 50. Furthermore, manufacturing costs can be reduced. In addition, while achieving miniaturization and reduced manufacturing costs, it is possible to improve the mixing efficiency of the two types of gases.

[0062] (2) The gas mixer 30 relating to the second embodiment is the gas mixer 30 of (1), wherein the direction from inside the elbow pipe fitting 50 toward the connection opening 53 is 90° with respect to the direction from inside the elbow pipe fitting 50 toward the inlet opening 52.

[0063] According to the above configuration, the elbow pipe fitting 50 is bent at 90°. The first gas F1 is bent at 90° in the direction of travel along the elbow pipe fitting 50 by flowing through the inside of the elbow pipe fitting 50.

[0064] (3) The gas mixer 30 relating to the third embodiment is the gas mixer 30 of (1) or (2), further comprising a connecting straight pipe 60, wherein the connecting straight pipe 60 is cylindrical around the straight pipe axis As, extends in the direction of the straight pipe axis Ds, and has a connecting straight pipe outlet opening 61 that opens at the end of the first side Dsf and a connecting straight pipe inlet opening 62 that opens at the end of the second side Dss, the connecting straight pipe outlet opening 61 is connected to the second inlet opening 43 of the T pipe joint 40, and the distance from the connecting straight pipe inlet opening 62 to the intermediate position of the straight pipe section 41 in the direction of the straight pipe axis Ds of the connecting straight pipe 60 is 10 times or more the inner diameter of the connecting straight pipe 60.

[0065] According to the above configuration, the connecting straight pipe 60 is connected to the second inlet opening 43 of the T-pipe fitting 40. The second gas F2 flowing into such a gas mixer 30 flows linearly for a distance of more than 10 times the inner diameter of the connecting straight pipe 60 before merging with the first gas F1. Therefore, the second gas F2 is mixed with the first gas F1 while ensuring that the flow velocity distribution is not biased.

[0066] (4) The gas turbine equipment 1 relating to the fourth embodiment comprises a gas mixer 30 of any of (1) to (3), a gas turbine GT having a combustor 19 into which fuel F can flow, a first gas line 21 through which the first gas F1, which is one of the fuel Fs, can flow and which is connected to the edge of the inlet opening 52 of the elbow pipe fitting 50, a second gas line 23 through which the second gas F2, which is another type of fuel Fs, can flow and which is connected directly or indirectly to the second inlet opening 43 of the T pipe fitting 40, and a mixed gas line 25 connecting the outlet opening 46 of the T pipe fitting 40 and the combustor 19 so that a mixed gas formed by mixing the first gas F1 and the second gas F2 in the gas mixer 30 can flow into the combustor 19.

[0067] In this configuration of gas turbine equipment 1, the first gas F1 flows through the first gas line 21 and into the gas mixer 30. The second gas F2 flows through the second gas line 23 and into the gas mixer 30. The mixed gas, which is a mixture of the first gas F1 and the second gas F2, can flow into the combustor 19 through the mixed gas line 25.

[0068] (5) The gas turbine equipment 1 relating to the fifth aspect is the gas turbine equipment 1 of (4), comprising: a first gas control valve 22 provided in the first gas line 21 and capable of adjusting the flow rate of the first gas F1 flowing through the first gas line 21; and a second gas control valve 24 provided in the second gas line 23 and capable of adjusting the flow rate of the second gas F2 flowing through the second gas line 23.

[0069] According to the above configuration, the flow rate of the first gas F1 can be adjusted by the first gas control valve 22. The flow rate of the second gas F2 can be adjusted by the second gas control valve 24. Therefore, according to this configuration, a mixed gas can be generated by appropriately changing the mixing ratio of the first gas F1 and the second gas F2. It is also possible to introduce only the first gas F1 or the second gas F2 into the combustor 19 through the mixed gas line 25, instead of a mixed gas.

[0070] (6) The sixth gas mixing method S0 includes an inflow step S2 in which a first gas F1 and a second gas F2 are introduced into a gas mixer 30, and a mixing step S3 in which the first gas F1 and the second gas F2 are mixed in the gas mixer 30, wherein the gas mixer 30 comprises a T-pipe fitting 40 and an elbow pipe fitting 50, the T-pipe fitting 40 is cylindrical around a straight pipe axis As, and has a straight pipe portion 41 extending in the straight pipe axis direction Ds along the straight pipe axis As, and The straight pipe section 41 has a cylindrical shape around a confluence pipe axis Aj that intersects the straight pipe axis As, and a confluence pipe section 45 that extends in the direction of the confluence pipe axis Dj along the confluence pipe axis Aj and communicates with the straight pipe section 41, and the straight pipe section 41 has a first side Dsf in the direction of the straight pipe axis Ds and a second side Dss opposite to the first side Dsf, with a first inlet opening 42 that opens at the end of the first side Dsf and a second inlet opening 43 that opens at the end of the second side Dss. The confluence pipe section 45 has an outlet opening 46 that is open in the direction of the confluence pipe axis Dj, on the opposite side from the connection point with the straight pipe section 41, and the elbow pipe joint 50 is cylindrical around the curved axis Ac, and has an inlet opening 52 that is open at one end in the direction along the curved axis Ac, and a connection opening 53 that is open at the other end in the direction along the curved axis Ac, and a virtual including the straight pipe axis As and the confluence pipe axis Aj The connection opening 53 of the elbow pipe fitting 50 is connected to the first inlet opening 42 of the T pipe fitting 40 so that the curved axis Ac curves within the plane Pv, the first gas F1 that flows into the elbow pipe fitting 50 from the inlet opening 52 flows into the T pipe fitting 40 from the first inlet opening 42 via the connection opening 53, and mixes with the second gas F2 that flows into the T pipe fitting 40 from the second inlet opening 43 in the junction pipe section 45.

[0071] According to the above configuration, the gas mixer 30 can mix the first gas F1 and the second gas F2. The gas mixer 30 includes a T-pipe fitting 40 and a bent elbow pipe fitting 50. The gas mixer 30 extends within a virtual plane Pv that includes the straight pipe axis As and the confluence pipe axis Aj. The first gas F1 that flows into the gas mixer 30 in the inflow process S2 is bent in its direction of travel along the elbow pipe fitting 50. After the direction of travel of the first gas F1 is bent by the elbow pipe fitting 50, the first gas F1 and the second gas F2 are mixed in the confluence pipe section 45 in the mixing process S3.

[0072] As described above, according to the gas mixing method S0 of this configuration, it is possible to improve the mixing ability of two types of gases while using a gas mixer 30 that has been miniaturized by being composed of a T-pipe fitting 40 and an elbow pipe fitting 50.

[0073] (7) The gas mixing method S0 relating to the seventh aspect is the gas mixing method S0 of (6), wherein the first gas F1 is introduced into the elbow pipe joint 50, causing the flow velocity distribution to be uneven, and then introduced into the confluence pipe section 45 for mixing.

[0074] According to the above configuration, the first gas F1 has its flow velocity distribution unevenly distributed when its direction of travel is bent by the elbow pipe fitting 50 in the inflow process S2. The elbow pipe fitting 50 has a connection opening 53 that is connected to the first inlet opening 42 of the T pipe fitting 40. As a result, the first gas F1 maintains its uneven flow velocity distribution when it merges with the second gas F2 in the mixing process S3. Therefore, in the mixing process S3, the cross-sectional flow after the first gas F1 and the second gas F2 merge becomes more complex, promoting gas mixing. [Explanation of symbols]

[0075] 1. Gas Turbine Equipment GT Gas Turbine 2 Gas turbine rotor 3. Intermediate casing 10 Compressor 11 Compressor Rotor 12 Compressor casing 15 Turbine 16 Turbine rotor 17 Turbine Casing 19 Combustor 20 Fuel supply system 21 First Gas Line 22 First gas control valve 23 Second Gas Line 24 Second gas control valve 25 Mixed gas line 30°C gas mixer 40 T-pipe fitting 41 Straight pipe section 42 First entrance opening 43 Second entrance opening 45 Merging pipe section 46 Exit opening 50, 50c Elbow Pipe Fitting 52, 52c entrance opening 53 Connection opening 60 connecting straight pipe 61 Connection straight pipe outlet opening 62 Connection straight pipe inlet opening F fuel F1 First Gas F2 Second Gas CG combustion gas A air Acom Compressed Air Ar rotor axis Da rotor axis direction Dau axis upstream side Downstream side of the Dad axis As straight pipe axis Ds Straight pipe axis direction Dsf first side Dss second side Aj Confluence pipe axis Dj confluence pipe axis direction Ac curved axis Direction of the curved axis (Dc) Pv virtual plane FL1, FL2, FL3 Main Flow S0 gas mixing method S1 Preparation process S2 Inflow Project S3 Hybrid Engineering

Claims

1. T-pipe fittings and Elbow pipe fittings and, Equipped with, The aforementioned T-pipe joint is, It has a cylindrical shape around the axis of a straight pipe, and a straight pipe section extending in the direction of the axis of the straight pipe along the axis of the straight pipe, It has a cylindrical shape around a confluence pipe axis that intersects the straight pipe axis, and a confluence pipe section that extends in the direction of the confluence pipe axis along the confluence pipe axis and communicates with the straight pipe section, The straight pipe section has a first side in the axial direction of the straight pipe and a second side opposite to the first side, with a first inlet opening at the end of the first side and a second inlet opening at the end of the second side. The aforementioned confluence pipe section has an outlet opening that is open in the axial direction of the confluence pipe section at the end opposite to the connection point with the straight pipe section, The elbow pipe joint is cylindrical around a curved axis and has an inlet opening at one end in the direction along the curved axis and a connecting opening at the other end in the direction along the curved axis. The curved axis is curved within a virtual plane that includes the straight pipe axis and the confluence pipe axis. The connection opening of the elbow pipe fitting is connected to the first inlet opening of the T pipe fitting so that the first gas flowing into the elbow pipe fitting from the inlet opening flows into the T pipe fitting from the first inlet opening via the connection opening and mixes with the second gas flowing into the T pipe fitting from the second inlet opening within the merging pipe section. Gas mixer.

2. The gas mixer according to claim 1, wherein the direction from the inside of the elbow pipe fitting toward the connection opening is 90° with respect to the direction from the inside of the elbow pipe fitting toward the inlet opening.

3. Further equipped with connecting straight pipes, The aforementioned connecting straight pipe is It has a cylindrical shape around the axis of the straight pipe, extends in the direction of the axis of the straight pipe, and has a connecting straight pipe outlet opening at the first end and a connecting straight pipe inlet opening at the second end, The outlet opening of the connecting straight pipe is connected to the second inlet opening of the T-pipe joint, The gas mixer according to claim 1, wherein the distance from the inlet opening of the connecting straight pipe to the midpoint of the straight pipe section in the axial direction of the connecting straight pipe is 10 times or more the inner diameter of the connecting straight pipe.

4. A gas mixer according to any one of claims 1 to 3, A gas turbine having a combustor into which fuel can be introduced, A first gas line through which the first gas, which is one of the aforementioned fuels, can flow, and which is connected to the edge of the inlet opening of the elbow pipe fitting, A second gas line through which the second gas, which is another type of fuel, can flow, and which is directly or indirectly connected to the second inlet opening of the T-pipe fitting, A mixed gas line is provided connecting the outlet opening of the T-pipe fitting and the combustor, so that the mixed gas, which is formed by mixing the first gas and the second gas in the gas mixer, can flow into the combustor. A gas turbine facility equipped with the following features.

5. A first gas control valve is provided in the first gas line and is capable of adjusting the flow rate of the first gas flowing through the first gas line, A second gas control valve is provided in the second gas line and is capable of adjusting the flow rate of the second gas flowing through the second gas line, The gas turbine equipment according to claim 4, comprising:

6. The inflow process involves introducing the first gas and the second gas into the gas mixer. A mixing step in which the first gas and the second gas are mixed in the aforementioned gas mixer, Includes, The aforementioned gas mixer is, T-pipe fittings and Elbow pipe fittings and, Equipped with, The aforementioned T-pipe joint is, It has a cylindrical shape around the axis of a straight pipe, and a straight pipe section extending in the direction of the axis of the straight pipe along the axis of the straight pipe, It has a cylindrical shape around a confluence pipe axis that intersects the straight pipe axis, and a confluence pipe section that extends in the direction of the confluence pipe axis along the confluence pipe axis and communicates with the straight pipe section, The straight pipe section has a first side in the axial direction of the straight pipe and a second side opposite to the first side, with a first inlet opening at the end of the first side and a second inlet opening at the end of the second side. The aforementioned confluence pipe section has an outlet opening that is open in the axial direction of the confluence pipe section, on the opposite side from the connection point with the straight pipe section. The elbow pipe joint is cylindrical around a curved axis and has an inlet opening at one end in the direction along the curved axis and a connecting opening at the other end in the direction along the curved axis. The curved axis is curved within a virtual plane that includes the straight pipe axis and the confluence pipe axis. The connection opening of the elbow pipe fitting is connected to the first inlet opening of the T pipe fitting so that the first gas flowing into the elbow pipe fitting from the inlet opening flows into the T pipe fitting from the first inlet opening via the connection opening and mixes with the second gas flowing into the T pipe fitting from the second inlet opening within the merging pipe section. Method of mixing gases.

7. The gas mixing method according to claim 6, wherein the first gas is introduced into the elbow pipe joint, causing the flow velocity distribution to be uneven, and then introduced into the confluence pipe section for mixing.

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