Nozzle and gas turbine

Abstract

The invention discloses a nozzle and a gas turbine, and the nozzle comprises a micro-mixing combustor which is provided with at least one on-duty channel and a plurality of micro-mixing channels; micro-mixing fuel spray rods are arranged in the micro-mixing channels and used for conveying high-hydrogen-content fuel to be micro-mixed with air in the corresponding micro-mixing channels. An on-duty fuel spray rod is arranged in the on-duty channel, a first channel and a second channel are arranged in the on-duty fuel spray rod, and the first channel is used for conveying natural gas fuel to be premixed with air in the on-duty channel; a first channel diffusion hole and a high-hydrogen-content fuel diffusion hole are formed in the end of the on-duty fuel spray rod, the first channel diffusion hole is communicated with the first channel in the on-duty fuel spray rod, and the high-hydrogen-content fuel diffusion hole is communicated with the second channel in the on-duty fuel spray rod. The high-hydrogen-content fuel and air form micro-mixing combustion based on the micro-mixing channel, and generation of nitric oxide can be reduced; ignition is carried out through the on-duty channel in a premixing and diffusion combustion mode, and deflagration can be avoided during ignition.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas turbines, in particular to a nozzle and a gas turbine. BACKGROUND

[0002] At present, in the field of gas turbines, high hydrogen-containing fuel gas (such as IGCC coal gas, biomass gas, coke oven gas, etc.) is increasingly widely used. However, due to the high hydrogen proportion of high hydrogen-containing fuel, it is easy to deflagrate when ignited, and the risk is high. Moreover, the nozzle currently used for burning high hydrogen-containing fuel is also prone to backfire and oscillation during the combustion process of high hydrogen-containing fuel. SUMMARY

[0003] The present application proposes a combustion chamber, aiming to solve the problems in the prior art that the gas turbine based on high hydrogen-containing fuel is easy to deflagrate when ignited, the risk is high, and the combustion process is easy to backfire and oscillate.

[0004] In the embodiments of the present application, a nozzle is proposed, comprising:

[0005] The micro-mixing combustor is provided with at least one value channel and a plurality of micro-mixing channels;

[0006] Each of the micro-mixing channels is provided with a micro-mixing fuel injection rod, each of the micro-mixing fuel injection rods extends from the air inlet end of the micro-mixing combustor into the corresponding micro-mixing channel, and each of the micro-mixing fuel injection rods is used to transport high hydrogen-containing fuel into the corresponding micro-mixing channel to form micro-mixing with the air in the corresponding micro-mixing channel;

[0007] Each of the value channels is provided with a value fuel injection rod, each of the value fuel injection rods extends along the corresponding value channel to the air outlet end of the micro-mixing combustor, the value fuel injection rod is provided with a first channel and a second channel, the first channel is used at least to transport natural gas fuel, and the second channel is used to transport high hydrogen-containing fuel;

[0008] Each of the value fuel injection rods is located in the value channel and is close to the outer side wall of the air inlet end of the micro-mixing combustor, and is provided with a plurality of value fuel branch injection rods; each value fuel branch injection rod on each value fuel injection rod is communicated with the first channel in the value fuel injection rod; each value fuel branch injection rod on each value fuel injection rod is used to transport the natural gas fuel in the first channel of the value fuel injection rod to the corresponding value channel to form pre-mixing with the air in the value channel;

[0009] The end of each value fuel injection rod close to the air outlet end of the micro-mixing combustor is provided with a first channel diffusion hole and a high hydrogen-containing fuel diffusion hole, the first channel diffusion hole on each value fuel injection rod is communicated with the first channel in the value fuel injection rod, and the high hydrogen-containing fuel diffusion hole on each value fuel injection rod is communicated with the second channel in the value fuel injection rod.

[0010] In the embodiments of the present application, the first passage and the second passage in any of the duty fuel injection rods extend along the axial direction of the corresponding duty fuel injection rod, and the second passage surrounds the first passage in the radial direction of the duty fuel injection rod.

[0011] In the embodiments of the present application, the high hydrogen content fuel diffusion holes in any of the duty fuel injection rods are provided in multiple, and in the radial direction of any of the duty fuel injection rods, the high hydrogen content fuel diffusion holes on the duty fuel injection rod surround the first passage diffusion hole on the duty fuel injection rod.

[0012] In the embodiments of the present application, the first passage includes an inlet passage, a transition passage and an outlet passage in the flow direction of the natural gas, the diameter of the transition passage is smaller than the diameters of the inlet passage and the outlet passage, and the diameter of the transition passage is greater than or equal to the diameter of the first passage diffusion hole.

[0013] In the embodiments of the present application, each of the duty fuel injection rods is provided with multiple swirl vanes on the outer side wall of the duty passage close to the gas outlet end of the micro-mixing combustor.

[0014] In the embodiments of the present application, the micro-mixing fuel injection rod is provided with at least one group of high hydrogen content fuel injection holes on the side wall in the micro-mixing passage, each high hydrogen content fuel injection hole in the same group is uniformly arranged in the circumferential direction of the micro-mixing fuel injection rod, and each high hydrogen content fuel injection hole in adjacent groups is arranged alternately in the circumferential direction of the micro-mixing fuel injection rod.

[0015] In the embodiments of the present application, the end of the micro-mixing fuel injection rod in the micro-mixing passage is provided with multiple swirl grooves, and each of the swirl grooves extends from the end of the micro-mixing fuel injection rod to the outer side wall of the micro-mixing fuel injection rod.

[0016] In the embodiments of the present application, the duty passages are provided in multiple, and the multiple duty passages include a central duty passage and multiple peripheral duty passages, in the radial direction of the micro-mixing combustor, each of the innermost micro-mixing passages surrounds the central duty passage, each of the peripheral duty passages is located between the innermost micro-mixing passage and the outermost micro-mixing passage, and each of the peripheral duty passages is uniformly distributed in the circumferential direction of the micro-mixing combustor.

[0017] In the embodiments of the present application, each of the micro-mixing passages is divided into multiple micro-mixing zones, and the multiple micro-mixing zones are sequentially arranged in the radial direction of the micro-mixing combustor from the inside to the outside.

[0018] In the embodiments of the present application, the multiple micro-mixing zones include a first micro-mixing zone, a second micro-mixing zone and a third micro-mixing zone.

[0019] The first micro-mixing zone surrounds a central duty passage, the second micro-mixing zone surrounds the first micro-mixing zone, and the third micro-mixing zone surrounds the second micro-mixing zone.

[0020] In the radial direction of the micro-mixing combustor, the peripheral duty passages are located outside the first micro-mixing zone.

[0021] In the embodiments of the present application, each micro-mixing passage in the third micro-mixing zone is provided with a chamfer at the edge of the air inlet end of the micro-mixing combustor.

[0022] In the embodiments of the present application, a plurality of micro-mixing swirl passages are arranged in the micro-mixing passage, each of the micro-mixing swirl passages is uniformly distributed along the circumferential direction of the micro-mixing combustor, and the portion of each of the micro-mixing swirl passages close to the air outlet end of the micro-mixing combustor is a compound angle, so that the gas in each of the micro-mixing swirl passages is swirled and discharged.

[0023] The present application also provides a gas turbine comprising the nozzle as described in any one of the preceding embodiments.

[0024] In the embodiments of the present application, the gas turbine further comprises:

[0025] A flame tube is arranged at the air outlet end of the micro-mixing combustor.

[0026] A flow guide bushing is sleeved outside the flame tube and the micro-mixing combustor, and has a gap between the flame tube and the micro-mixing combustor in the radial direction of the flame tube, and has a gap between the air inlet end of the micro-mixing combustor and the flow guide bushing in the axial direction of the micro-mixing combustor.

[0027] A combustion cylinder is sleeved at one end of the flow guide bushing away from the micro-mixing combustor, the combustion cylinder is provided with an air inlet, the portion of the flow guide bushing sleeved in the combustion cylinder is provided with a flow regulating hole, and the end of the flame tube close to the combustion cylinder is provided with a combustion mixing hole.

[0028] In the embodiments of the present application, the gas turbine further comprises:

[0029] A plurality of raised ribs are arranged on the outer wall of the flame tube, the ribs are arranged in the circumferential direction of the flame tube, and the ribs are arranged in the axial direction of the flame tube, the cylinder wall between adjacent ribs is provided with a gas film hole, and the gas film hole is connected to the inside of the flame tube.

[0030] In the embodiment of the present application, the high hydrogen content fuel is based on the micro-mixing channel and the air micro-mixing re-enters the flame tube to form micro-mixing combustion, which can reduce the generation of nitrogen oxides, and the high hydrogen content fuel flows out of the micro-mixing channel with a small caliber at a high flow rate, which can avoid backfire; by setting the value service channel, the natural gas fuel sprayed from the value service fuel branch nozzle and the natural gas flowing out of the first channel diffusion hole can be ignited in a combination of premixed combustion and diffusion combustion, which can avoid the phenomenon of deflagration during ignition and is more safe; in addition, when the natural gas flowing out of the first channel diffusion hole diffuses and burns, the combustion is also more stable and can also play a role in stabilizing the flame, and when the high hydrogen content fuel flowing out of the high hydrogen content fuel diffusion hole diffuses and burns, the combustion is relatively stable and can also play a role in stabilizing the flame. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0032] Figure 1 A cross-sectional view of the nozzle in an embodiment of the present application installed in the combustion chamber;

[0033] Figure 2 A cross-sectional view of the nozzle in an embodiment of the present application installed in the combustion chamber;

[0034] Figure 3 A cross-sectional view of the micro-mixing fuel nozzle in an embodiment of the present application in the micro-mixing channel;

[0035] Figure 4 A structure schematic view of the micro-mixing fuel nozzle in an embodiment of the present application;

[0036] Figure 5 A cross-sectional view of the value service fuel nozzle in an embodiment of the present application;

[0037] Figure 6 A structure schematic view of the value service fuel nozzle in an embodiment of the present application;

[0038] Figure 7 A cross-sectional view of the value service fuel nozzle in an embodiment of the present application;

[0039] Figure 8 A front view of the micro-mixing combustor in an embodiment of the present application;

[0040] Figure 9 A cross-sectional view of the micro-mixing combustor in an embodiment of the present application;

[0041] Figure 10 is a front view of an end cover in an embodiment of the present application;

[0042] Figure 11 is a structural schematic view of a combustion chamber of a gas turbine in an embodiment of the present application.

[0043] BRIEF DESCRIPTION OF DRAWINGS

[0044] 100 - micro-mix burner, 110 - primary passage, 111 - first cooling hole, 120 - micro-mix passage, 121 - first micro-mix zone, 122 - second micro-mix zone, 123 - third micro-mix zone, 124 - micro-mix swirling passage, 130 - micro-mix fuel injection rod, 131 - high hydrogenous fuel injection hole, 132 - swirling groove, 140 - primary fuel injection rod, 141 - first passage, 142 - second passage, 143 - primary fuel sub-injection rod, 144 - first passage diffusion hole, 145 - high hydrogenous fuel diffusion hole, 146 - inlet passage, 147 - transition passage, 148 - outlet passage, 149 - swirled vane, 150 - primary fuel sub-injection hole, 151 - end cover, 152 - first high hydrogenous fuel cavity, 153 - second high hydrogenous fuel cavity, 154 - third high hydrogenous fuel cavity, 155 - micro-mix high hydrogenous fuel inlet, 160 - combustion pressure cylinder, 161 - air inlet, 170 - flow guide bushing, 171 - straightening hole, 180 - flame tube, 181 - combustion mixing hole, 182 - rib, 183 - film hole.

[0045] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0047] It should be noted that if the directionality indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of the present application, the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indication also changes accordingly.

[0048] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope claimed by the present application.

[0049] As shown in Figure 1 , Figure 2 , the present application provides a nozzle, comprising:

[0050] The micro-mixing combustor 100 is provided with at least one duty passage 110 and a plurality of micro-mixing passages 120;

[0051] Each of the micro-mixing passages 120 is provided with a micro-mixing fuel injection rod 130, each of the micro-mixing fuel injection rods 130 extends from the air inlet end of the micro-mixing combustor 100 into the corresponding micro-mixing passage 120, and each of the micro-mixing fuel injection rods 130 is used to transport high hydrogen content fuel into the corresponding micro-mixing passage 120 to form micro-mixing with the air in the corresponding micro-mixing passage 120;

[0052] Each of the duty passages 110 is provided with a duty fuel injection rod 140, each of the duty fuel injection rods 140 extends along the corresponding duty passage 110 to the air outlet end of the micro-mixing combustor 100, the duty fuel injection rod 140 is provided with a first passage 141 and a second passage 142, the first passage 141 is used to transport at least natural gas fuel, and the second passage 142 is used to transport high hydrogen content fuel;

[0053] Each of the duty fuel injection rods 140 located in the duty passage 110 and close to the outer wall of the air inlet end of the micro-mixing combustor 100 is provided with a plurality of duty fuel branch injection rods 143; each of the duty fuel branch injection rods 143 on each of the duty fuel injection rods 140 is communicated with the first passage 141 in the duty fuel injection rod 140; each of the duty fuel branch injection rods 143 on each of the duty fuel injection rods 140 is used to transport the natural gas fuel in the first passage 141 of the duty fuel injection rod 140 to the corresponding duty passage 110 to form premixing with the air in the duty passage 110;

[0054] The first passage diffusion hole 144 and the high hydrogen content fuel diffusion hole 145 are arranged at the end of each of the duty fuel injection rods 140 close to the air outlet end of the micro-mixing combustor 100. The first passage diffusion hole 144 on each of the duty fuel injection rods 140 is in communication with the first passage 141 in the duty fuel injection rod 140. The high hydrogen content fuel diffusion hole 145 on each of the duty fuel injection rods 140 is in communication with the second passage 142 in the duty fuel injection rod 140.

[0055] As shown in Figure 1 , Figure 2 , Figure 1 is a sectional view of the nozzle in the embodiment of the present application after being installed in the combustion chamber, Figure 2 is a structural schematic view of the nozzle in the embodiment of the present application after being installed in the combustion chamber. In Figure 1 , Figure 2 , the left end of the micro-mixing combustor 100 is the air inlet end, and the right end is the air outlet end. The duty passage 110 and the micro-mixing passage 120 are both in the axial direction of the micro-mixing combustor 100, and pass through from the air inlet end to the air outlet end. The air inlet of each micro-mixing passage 120 is located on the end face of the air inlet end of the micro-mixing combustor 100, and the air outlet of each micro-mixing passage 120 is located on the end face of the air outlet end of the micro-mixing combustor 100. The air inlet of each duty passage 110 is located on the end face of the air inlet end of the micro-mixing combustor 100, and the air outlet of each duty passage 110 is located on the end face of the air outlet end of the micro-mixing combustor 100. During the operation of the gas turbine, air can flow into each micro-mixing passage 120 and each duty passage 110 from the air inlet end of the micro-mixing combustor 100, pass through each micro-mixing passage 120 and each duty passage 110, and flow out from the air outlet end of the micro-mixing combustor 100. In addition, each duty passage 110 and each micro-mixing passage 120 are arranged parallel to the axis of the micro-mixing combustor 100.

[0056] In the embodiment of the present application, the micro-mixing passage 120 can be provided with a smaller inner diameter, for example, 8-12 mm, so that it has a smaller space inside, so that the air and fuel entering the inside can realize micro-mixing.

[0057] As shown in Figure 1 , Figure 2 , Figure 3 , in the embodiment of the present application, each micro-mixing passage 120 is provided with a micro-mixing fuel injection rod 130. The outer diameter of the micro-mixing fuel injection rod 130 is smaller than the inner diameter of the micro-mixing passage 120, so that there is a gap between the micro-mixing fuel injection rod 130 and the micro-mixing passage 120. Figure 1 and Figure 3In the indicated orientation, the left end of the micro-mixed fuel injector 130 is its air inlet, and the right end is its air outlet. The air outlet of the micro-mixed fuel injector 130 can extend into its corresponding micro-mixing channel 120 through its air inlet. The air inlet of the micro-mixed fuel injector 130 is used for the input of high-hydrogen fuel. After entering the micro-mixed fuel injector 130 from its air inlet, the high-hydrogen fuel eventually flows into the corresponding micro-mixing channel 120 from its air outlet. Alternatively, air can enter the micro-mixing channel 120 from the air inlet on the side of the micro-mixing burner 100 through the gap between the micro-mixing channel 120 and the micro-mixed fuel injector 130, and flow towards its outlet. During this flow, it can encounter the high-hydrogen fuel flowing out from the air outlet of the micro-mixed fuel injector 130 within the micro-mixing channel 120. Because the space inside the micro-mixing channel 120 is relatively small, and there is a certain distance from the outlet of the micro-mixing fuel injector 130 to the outlet of the micro-mixing channel 120, the air entering the micro-mixing channel 120 can form a micro-mixing with the high hydrogen content fuel flowing out from the outlet of the micro-mixing fuel injector 130 during the flow towards the outlet of the micro-mixing channel 120, and finally flow out from the outlet of the micro-mixing channel 120.

[0058] like Figure 1 As shown, the micro-hybrid burner 100 is installed after the combustion chamber, and the outlet end of the micro-hybrid burner 100 (i.e., Figure 1 The right end of the micro-mixing burner 100 in the indicated orientation is connected to the flame tube 180. Therefore, for the high-hydrogen-content fuel and air from the micro-mixing channel 120, after micro-mixing in the channel 120 before flowing into the combustion tube for combustion, micro-mixing combustion can be formed. This reduces the formation of nitrogen oxides, and the combustion process is more stable than diffusion combustion in existing technologies, reducing oscillations during combustion.

[0059] In addition, such as Figure 3 As shown, for the micro-mixed fuel injector 130, its outlet end is inside the micro-mixing channel 120. The relative positions of the two can be set so that the outlet end of the micro-mixed fuel injector 130 is close to the air inlet of the micro-mixing channel 120. This allows the high-hydrogen fuel to have a longer distance from the outlet of the micro-mixing channel 120 after flowing out of the micro-mixed fuel injector 130, which facilitates the full mixing of the high-hydrogen fuel and the air in the micro-mixing channel 120.

[0060] like Figure 1 , Figure 2As shown in the embodiments of this application, there can be one or more duty channels 110. Taking the setting of only one duty channel 110 as an example, when only one duty channel 110 is set, the duty channel 110 can be coaxially arranged with the micro-mixing burner 100. That is, in the radial direction of the micro-mixing burner 100, the duty channel 110 is located at the center of the micro-mixing burner 100, while each micro-mixing channel 120 can be evenly distributed in the outer area of ​​the duty channel 110.

[0061] In this embodiment, the standby fuel injector 140 has an inlet end and an outlet end. Figure 4 In the orientation shown, the left end of the duty fuel injector 140 is its air inlet end, and the right end is its air outlet end. The duty fuel injector 140 extends from the air inlet side of the micro-hybrid burner 100 into the duty channel 110 based on the air inlet port, and extends towards the air outlet of the duty channel 110, but the air outlet end of the duty fuel injector 140 does not extend out of the air outlet of the duty channel 110.

[0062] like Figure 5 , Figure 6 , Figure 7 As shown, the outer wall of the duty fuel injector 140 is provided with multiple duty fuel branch injectors 143. Each duty fuel branch injector 143 extends radially outward from the outer wall of the duty fuel injector 140, and the duty fuel branch injectors 143 can be uniformly arranged circumferentially around the duty fuel injector 140. It should be noted that all the duty fuel branch injectors 143 of the same duty fuel injector 140 are on the same circle, and the inner diameter of the duty channel 110 needs to be larger than the diameter of the circumference formed by the outermost circles of the duty fuel branch injectors 143, so that the duty fuel branch injectors 143 can be accommodated within the duty channel 110.

[0063] like Figure 1 , Figure 2 , Figure 5As shown in this embodiment, the standby fuel injector 140 has two fuel channels. The first channel 141 is used to transport at least natural gas fuel, and the second channel 142 is used to transport high-hydrogen fuel. Each standby fuel branch injector 143 is provided with multiple standby fuel branch nozzles 150. Each standby fuel branch nozzle 150 is connected to the first channel 141. Therefore, the natural gas fuel in the first channel 141 can flow to each standby fuel branch injector 143, and then flow into the standby channel 110 through the standby fuel branch nozzles 150 on each standby fuel branch injector 143. In addition, for each standby fuel branch nozzle 150 on each standby fuel branch injector 143, the airflow is smaller at the position of the standby fuel branch nozzle 150 further away from the axis of the standby fuel injector 140. Therefore, the diameter of the standby fuel branch nozzle 150 can be gradually increased in the direction away from the axis of the standby fuel injector 140.

[0064] In other embodiments, the first channel 141 in the duty fuel injector 140 can be supplied with different gases under different operating conditions. For example, natural gas fuel can be supplied during ignition. After successful ignition, when switching from no-load to high-load conditions, purge air can be supplied to the first channel 141. The purge air flows out from the first channel diffuser hole 144 of the first channel 141, which can reduce the nozzle temperature.

[0065] like Figure 5 , Figure 6 As shown in this embodiment, the outlet end of the duty fuel injector 140 is provided with a first channel diffuser hole 144 and a high hydrogen content fuel diffuser hole 145. The first channel diffuser hole 144 is connected to the first channel 141, and the high hydrogen content fuel diffuser hole 145 is connected to the second channel 142. That is, natural gas or purge air in the first channel 141 can also flow out from the first channel diffuser hole 144, and high hydrogen content fuel in the second channel 142 can flow out from the high hydrogen content fuel diffuser hole 145.

[0066] like Figure 1 , Figure 5As shown, when the duty fuel injection rod 140 is installed in the duty passage 110, the duty fuel branch injection rod 143 is located at one side of the duty passage 110 close to the air inlet of the duty passage 110, and the air outlet end of the duty fuel injection rod 140 is located at one side of the duty passage 110 close to the air outlet of the duty passage 110. For the natural gas fuel, it enters the first passage 141 from the air inlet end of the duty fuel injection rod 140, and flows along the first passage 141, a part of the natural gas can flow into the duty passage 110 from each duty fuel branch injection rod 143, and another part of the natural gas flows out from the first passage diffusion hole 144 on the air outlet end of the duty fuel injection rod 140; for the high hydrogen content fuel, it enters the second passage 142 from the air inlet end of the duty fuel injection rod 140, and flows along the second passage 142, and finally all flows out from the high hydrogen content fuel diffusion hole 145 on the air outlet end of the duty fuel injection rod 140. Referring to Figure 1 When the micro-mixing combustor 100 is installed on the combustion chamber, the air outlet end of the micro-mixing combustor 100 directly faces the flame tube 180. For the air in the combustion chamber, a part of it enters the micro-mixing combustor 100 from the air inlet end of the micro-mixing combustor 100, enters the flame tube 180 after passing through the micro-mixing combustor 100, and another part of it directly enters the flame tube 180.

[0067] Therefore, for the high hydrogen content fuel flowing out from the high hydrogen content fuel diffusion hole 145 on the air outlet end of the duty fuel injection rod 140, when it flows out from the high hydrogen content fuel diffusion hole 145, it can quickly enter the flame tube 180, and before entering the flame tube 180, it almost does not contact with air, or only contacts with a small amount of air, and can contact with the air in the flame tube 180 in the combustion process after entering the flame tube 180, so that diffusion combustion can be formed.

[0068] Therefore, for the high hydrogen content fuel flowing out from the high hydrogen content fuel diffusion hole 145 on the air outlet end of the duty fuel injection rod 140, when it flows out from the high hydrogen content fuel diffusion hole 145, it can quickly enter the flame tube 180, and before entering the flame tube 180, it almost does not contact with air, or only contacts with a small amount of air, and can contact with the air in the flame tube 180 in the combustion process after entering the flame tube 180, so that diffusion combustion can be formed.

[0069] For the natural gas flowing out from the duty fuel branch injection rod 143, when it flows out from the duty fuel branch injection rod 143, it enters the duty passage 110, but still has a certain distance to the air outlet of the duty passage 110, and the inner diameter of the duty passage 110 is relatively large, so that there is a certain space, and therefore, the natural gas flowing out from the duty fuel branch injection rod 143 can form premixing with the air in the duty passage 110, and after premixing, it flows out from the duty passage 110 into the flame tube 180, so that premixing combustion can be formed.

[0070] Therefore, the nozzle in the embodiment of the present application can reduce the generation of nitrogen oxides by setting multiple micro-mixing channels 120, and the high hydrogen content fuel flows out of the micro-mixing channels 120 with a high flow rate, so that backfire can be avoided; the combination of premixed combustion and diffusion combustion can be used for ignition based on the natural gas fuel sprayed from the duty fuel branch spray rod 143 and the natural gas flowing out of the first channel diffusion hole 144, so that deflagration can be avoided during ignition, and safety is improved. In addition, the natural gas flowing out of the first channel diffusion hole 144 can burn more stably and can also play a role in stabilizing the flame, and the high hydrogen content fuel flowing out of the high hydrogen content fuel diffusion hole 145 can burn more stably and can also play a role in stabilizing the flame.

[0071] As shown in Figure 5 , Figure 6 In the embodiment of the present application, the first channel 141 and the second channel 142 in any duty fuel spray rod 140 extend along the axial direction of the corresponding duty fuel spray rod 140, and in the radial direction of the duty fuel spray rod 140, the second channel 142 surrounds the first channel 141.

[0072] The high hydrogen content fuel diffusion hole 145 in any duty fuel spray rod 140 is provided with multiple high hydrogen content fuel diffusion holes 145, and in the radial direction of any duty fuel spray rod 140, the high hydrogen content fuel diffusion holes 145 on the duty fuel spray rod 140 surround the first channel diffusion hole 144 on the duty fuel spray rod 140.

[0073] Referring to Figure 5 In the embodiment of the present application, the first channel 141 can be coaxially arranged with the duty fuel spray rod 140, and the second channel 142 can be an annular channel surrounding the outside of the first channel 141. The gas outlet end of the duty fuel spray rod 140 can be provided in the shape of a conical frustum, the end of the gas outlet end is the top surface of the conical frustum, the diameter of the side surface of the conical frustum gradually decreases towards the top surface, the first channel diffusion hole 144 is located at the center position of the conical frustum plane, and the high hydrogen content fuel diffusion hole 145 can be provided with multiple high hydrogen content fuel diffusion holes 145 uniformly distributed along the circumferential direction of the side surface of the conical frustum to surround the outside of the first channel diffusion hole 144.

[0074] As shown in Figure 5 In the embodiment of the present application, along the flow direction of the natural gas, the first channel 141 includes an inlet channel 146, a transition channel 147 and an outlet channel 148, the diameter of the transition channel 147 is smaller than the diameters of the inlet channel 146 and the outlet channel 148, and the diameter of the transition channel 147 is greater than or equal to the diameter of the first channel diffusion hole 144.

[0075] In the embodiment of the present application, the first channel 141 can include three sections, the first section is the inlet channel 146 near the gas inlet end of the duty fuel injection rod 140, the second section is the transition channel 147 in the middle part, and the third section is the outlet channel 148 near the gas outlet end of the duty fuel injection rod 140. The diameters of the outlet channel 148 and the inlet channel 146 at both ends are larger than that of the transition channel 147 in the middle, and in addition, the diameter of the transition channel 147 is greater than or equal to the diameter of the first channel diffusion hole 144. Then the natural gas fuel first enters the inlet channel 146 at the first end, and then enters the outlet channel 148 through the transition channel 147, and finally flows into the first channel diffusion hole 144 from the outlet channel 148. The diameter of the transition channel 147 is smaller than that of the outlet channel 148, so that the flow rate of the natural gas fuel increases after passing through the transition channel 147, and an impinging jet can be formed after flowing out of the transition channel 147. When the impinging jet enters the outlet channel 148, the flow rate is relatively fast, so the pressure of the impinging jet is relatively small when it enters the outlet channel 148, and the natural gas around the impinging jet can form a backflow. The gas in the backflow and the impinging jet are fully mixed, and the local flow rate and pressure difference are uniform, which breaks the large-scale vortex that can easily cause pressure fluctuations, makes the flow field pressure distribution more uniform, reduces the fluctuation amplitude of the pressure peak and valley, and then uniformizes the flow field parameters in the outlet channel 148. The outlet channel 148 has a pressure stabilizing effect, avoiding the situation that the pressure of the outlet channel 148 fluctuates greatly due to the change of the pressure of the pipeline conveying natural gas or clean blowing air in the gas turbine, and the stable pressure of the outlet channel 148 can ensure that the first channel diffusion hole can uniformly flow out natural gas fuel or clean blowing air. In addition, the outlet channel 148 is near the flame tube 180, and the temperature is relatively high. When the impinging jet hits the part of the outlet channel 148 near the flame tube 180, it also has a cooling effect on this part.

[0076] In addition, the diameter of the transition channel 147 is greater than or equal to the diameter of the first channel diffusion hole 144. Generally, the diameter of the transition channel 147 can be set to be slightly larger than the diameter of the first channel diffusion hole 144, so that there is sufficient natural gas or clean blowing air entering the outlet channel 148, and the first channel diffusion hole 144 can stably flow out natural gas or clean blowing air.

[0077] As shown in Figure 1 , Figure 5 , Figure 6 In the embodiment of the present application, each of the duty fuel injection rods 140 is located in the duty channel 110 and on the outer side wall near the gas outlet end of the micro-mixed combustor 100, and is provided with a plurality of swirl vanes 149.

[0078] Wherein, the swirl vane 149 is arranged at the end of the duty fuel injection rod 140 close to the air outlet of the duty passage 110, then the air flowing into the duty passage 110 at the inlet of the micro-mixing combustor 100 can flow out of the duty passage 110 into the flame tube 180 in the form of swirl, so that a low pressure area can be formed at the air outlet position of the duty passage 110. Then the high temperature flame in the flame tube 180 can flow back to the micro-mixing combustor 100, after the high temperature flame flows back to the air outlet position of the duty passage 110, the high temperature flame can contact with the newly flowed fuel and air from the duty passage 110, and continue to ignite the newly flowed fuel, so as to ensure that the flowed fuel and air are continuously ignited, thus, whether the ignition is performed by using the natural gas in the first passage 141 or the high hydrogen content fuel in the second passage 142 to maintain the operation of the gas turbine, the effect of stabilizing the flame can be achieved. In addition, the swirl vane 149 can also increase the mixing effect of the air and the fuel.

[0079] As shown in Figure 1 , Figure 3 , Figure 4 In the embodiment of the present application, the micro-mixing fuel injection rod 130 is provided with at least one group of high hydrogen content fuel injection holes 131 on the side wall in the micro-mixing passage 120, each high hydrogen content fuel injection hole 131 in the same group is uniformly arranged along the circumference of the micro-mixing fuel injection rod 130, and each high hydrogen content fuel injection hole 131 in adjacent groups is arranged in a staggered manner along the circumference of the micro-mixing fuel injection rod 130.

[0080] Wherein, the high hydrogen content fuel enters the micro-mixing fuel injection rod 130 and is finally injected from the high hydrogen content fuel injection hole 131 to the micro-mixing passage 120, and then is mixed with the air in the micro-mixing passage 120. In order to improve the uniformity of the mixing of the high hydrogen content fuel and the air in the micro-mixing passage 120, the high hydrogen content fuel injection hole 131 in the embodiment of the present application is arranged in multiple groups, each group is arranged along the circumference of the micro-mixing fuel injection rod 130, so that the high hydrogen content fuel in the micro-mixing fuel injection rod 130 can be uniformly injected to the circumference of the micro-mixing fuel injection rod 130, and each high hydrogen content fuel injection hole 131 in adjacent groups is arranged in a staggered manner, that is, the high hydrogen content fuel can be injected to the micro-mixing passage 120 in a staggered direction from the high hydrogen content fuel injection holes 131 of the adjacent two groups, which can further improve the uniformity of the mixing of the air and the high hydrogen content fuel.

[0081] In addition, in other embodiments, the injection direction of each high hydrogen content fuel injection hole 131 can be arranged at a certain angle with the axis of the micro-mixing fuel injection rod 130, and the high hydrogen content fuel can be injected into the micro-mixing passage 120 at a certain angle, which can further improve the uniformity of the mixing of the air and the high hydrogen content fuel.

[0082] As shown in Figure 3 , Figure 4As shown in the embodiment of this application, the end of the micro-mixed fuel injector 130 located in the micro-mixing channel 120 is provided with a plurality of swirling grooves 132, and each of the swirling grooves 132 extends from the end of the micro-mixed fuel injector 130 to the outer side wall of the micro-mixed fuel injector 130.

[0083] Reference Figure 3 , Figure 4 As shown, the swirl channel 132 is disposed on the end face of the outlet end of the micro-mixed fuel injector 130 and extends to the outer wall of the micro-mixed fuel injector 130. The air entering the micro-mixing channel 120 and the high-hydrogen fuel injected from the high-hydrogen fuel nozzle 131 pass through the outlet end of the micro-mixing fuel injector 130 during their flow towards the outlet of the micro-mixing channel 120. They can then enter the swirl channel 132 along the side wall of the micro-mixing fuel injector 130 and flow out of the swirl channel 132 in a swirling manner. On the one hand, the swirling flow can improve the mixing uniformity of air and high-hydrogen fuel. On the other hand, it can prevent the formation of a low-pressure zone at the outlet end of the micro-mixed fuel injector 130.

[0084] like Figure 1 , Figure 2 , Figure 8 As shown in this embodiment, multiple duty channels 110 are provided, including a central duty channel 110 and multiple peripheral duty channels 110. In the radial direction of the micro-mixing burner 100, the innermost micro-mixing channels 120 surround the central duty channel 110, and the peripheral duty channels 110 are located between the innermost and outermost micro-mixing channels 120. In the circumferential direction of the micro-mixing burner 100, the peripheral duty channels 110 are evenly distributed.

[0085] like Figure 1 , Figure 2 Figure 8 In this embodiment, three duty channels 110 can be set on the periphery. When natural gas fuel is used for ignition in each duty channel 110, the duty channels 110 located on the periphery are closer to the outer wall of the flame tube 180, enabling them to quickly connect with the flame tubes 180. When high-hydrogen fuel in each duty channel 110 is used for diffusion combustion to maintain the operation of the gas turbine, since each duty fuel injector 140 in each duty channel 110 is equipped with swirl blades 149, a swirling low-pressure zone can be formed at the outlet of each duty channel 110. This allows the high-temperature combustion gas at the corresponding positions of the flame tube 180 and the outlet of each duty channel 110 to flow back, achieving a flame stabilization effect. In addition, the peripheral duty channels 110 are uniformly arranged around the micro-mixer burner 100, thus enabling uniform flame stabilization at each position and avoiding local combustion oscillations.

[0086] likeFigure 2 , Figure 8 As shown in the embodiment of this application, each of the micro-mixing channels 120 is divided into multiple micro-mixing zones, which are arranged sequentially from the inside to the outside along the radial direction of the micro-mixing burner 100.

[0087] Among them, reference Figure 2 , Figure 8 Each micro-mixing zone is annular, and the micro-mixing zones are arranged sequentially from the outside to the inside. When only one duty channel 110 is provided, the duty channel 110 can be placed at the center of the innermost micro-mixing zone; when there are multiple duty channels 110, the central duty channel 110 can be placed inside the innermost micro-mixing zone, and the peripheral duty channels 110 are placed radially between the innermost and outermost micro-mixing zones. In this embodiment, multiple micro-mixing zones are provided, allowing different micro-mixing zones to be selected for operation under different working conditions, thereby achieving precise matching of working conditions.

[0088] For example, such as Figure 2 , Figure 8 As shown in the embodiments of this application, the plurality of micro-mixing regions include a first micro-mixing region 121, a second micro-mixing region 122, and a third micro-mixing region 123;

[0089] The first micro-mixing zone 121 surrounds the central duty passage 110, the second micro-mixing zone 122 surrounds the first micro-mixing zone 121, and the third micro-mixing zone 123 mixes around the second micro-mixing zone 122.

[0090] In the radial direction of the micro-mixing burner 100, each peripheral duty channel 110 is located outside the first micro-mixing zone 141.

[0091] Reference Figure 2 , Figure 4 In this embodiment of the application, a first micro-mixing zone 121, a second micro-mixing zone 122 and a third micro-mixing zone 123 are set up, and four duty channels 110 are set up. By using the three micro-mixing zones and the four duty channels 110, fine-grained adjustments can be made under different working conditions.

[0092] For example, in the embodiments of this application, the gas turbine can be divided into the following operating conditions: ignition to full speed no-load stage, full speed no-load to first rated load stage, first rated load to second rated load stage, and second rated load to full load stage, wherein the first rated load is less than the second rated load, and the second rated load is less than the full load.

[0093] When upgrading operating conditions, the switching is based on the following method:

[0094] Ignition stage to full speed idle: the first channel 141 of the duty fuel injection rod 140 in each duty channel 110 can be opened, and ignition based on natural gas fuel of each duty fuel injection rod 140 is easy to ignite, more stable, and can quickly connect with other flame tubes 180.

[0095] Full speed idle to first rated load stage: after full speed idle, the natural gas fuel in the first channel 141 of each duty fuel injection rod 140 can be replaced with clean blow air, the second channel 142 of each duty fuel injection rod 140 is opened, and each micro-mixed fuel injection rod 130 in the first micro-mixed zone 121 is started to work, so that the gas turbine reaches the first rated load in the form of diffusion combustion of high hydrogen content fuel in each duty channel 110 and micro-mixed combustion of high hydrogen content fuel in each micro-mixed channel 120 in the first micro-mixed zone 121.

[0096] First rated load to second rated load stage: after reaching the first rated load, the second channel 142 of each duty fuel injection rod 140 can be closed, and each micro-mixed combustion injection rod in the second micro-mixed zone 122 is started, so that the second rated load is reached in the form of micro-mixed combustion of high hydrogen content fuel in each micro-mixed channel 120 in the first micro-mixed zone 121 and the second micro-mixed zone 122.

[0097] Second rated load to full load stage: after reaching the second rated load, the first micro-mixed zone 121 and the second micro-mixed zone 122 are kept in the open state of each micro-mixed fuel injection rod 130, and each micro-mixed combustion injection rod in the third micro-mixed zone 123 is started, so that the full load is reached in the form of micro-mixed combustion of high hydrogen content fuel in each micro-mixed channel 120 in the first micro-mixed zone 121, the second micro-mixed zone 122 and the third micro-mixed zone 123.

[0098] When the working condition is reduced, the following modes are switched:

[0099] Full load to second rated load stage: the third micro-mixed zone 123 is closed to each micro-mixed fuel injection rod 130, and the first micro-mixed zone 121 and the second micro-mixed zone 122 are kept open to each micro-mixed fuel injection rod 130.

[0100] Second rated load to first rated load: the second micro-mixed zone 122 is closed to each micro-mixed fuel injection rod 130, the first micro-mixed zone 121 is kept open to each micro-mixed fuel injection rod 130, and the second channel 142 of the duty fuel injection rod 140 in each duty channel 110 is opened according to the combustion state to supply a small amount of high hydrogen content fuel to the flame tube to suppress combustion oscillation.

[0101] First rated load stage to full speed idle: the first micro-mixed zone 121 is closed to each micro-mixed fuel injection rod 130, and the second channel 142 of the duty fuel injection rod 140 in each duty channel 110 is kept open.

[0102] Full speed no load to shutdown: close the second passage 142 of the duty fuel injection rod 140 in each duty passage 110.

[0103] As shown in Figure 1 , Figure 2 In the embodiment of the present application, each micro-mixing passage 120 in the third micro-mixing area 123 is provided with a chamfer at the edge of the air inlet end of the micro-mixing combustor 100.

[0104] The third micro-mixing area 123 is located at the outermost area of the micro-mixing combustor 100, and the air flow at the area of the third micro-mixing area 123 is relatively less than that at the first micro-mixing area 121 and the second micro-mixing area 122. Therefore, the air inlet of each micro-mixing passage 120 in the third micro-mixing area 123 can be chamfered, such as rounded or beveled, to increase the air flow into each micro-mixing passage 120 in the third micro-mixing area 123.

[0105] As shown in Figure 2 , Figure 9 Each micro-mixing passage 120 is provided with a plurality of micro-mixing swirl passages 124, each of which is uniformly distributed along the circumference of the micro-mixing combustor 100, and the portion of each micro-mixing swirl passage 124 close to the air outlet end of the micro-mixing combustor 100 is a compound angle to make the gas in each micro-mixing swirl passage 124 swirl out.

[0106] The extension direction of the micro-mixing passage 120 is the same as the axial direction of the micro-mixing combustor 100, and the air and high-hydrogen fuel flowing out of each micro-mixing passage 120 are roughly injected into the flame tube 180 in a direction parallel to the axial direction of the micro-mixing combustor 100. In the embodiment of the present application, a part of the micro-mixing swirl passages 124 are arranged in each micro-mixing passage 120, as shown in Figure 9 The outlet portion of each micro-mixing swirl passage 124 is a compound angle, and the final outlet direction of each micro-mixing swirl passage 124 is at an angle with the axial direction of the combustor, as shown in Figure 9 α, which can be an angle less than 20°, so that the air and high-hydrogen fuel injected from each micro-mixing swirl passage 124 can be injected into the flame tube 180 in a swirling manner, thereby forming a low-pressure area at the position of swirling injection, so that the high-pressure gas at each low-pressure area position flows back to play a role of stabilizing the flame.

[0107] In addition, as shown in Figure 8As shown in the embodiments of the present application, the micro-mixing rotational flow channels 124 can be arranged in groups, such as three groups a, b, and c, each group including a plurality of micro-mixing rotational flow channels 124, and each group being uniformly distributed in the circumferential direction of the micro-mixing combustor 100. For example, the micro-mixing channels 120 in the first micro-mixing zone 121 and the second micro-mixing zone 122 can all be arranged as micro-mixing rotational flow channels 124. Arranging a large area of micro-mixing rotational flow channels 124 can greatly improve the flame stabilization effect.

[0108] In the embodiments of the present application, a plurality of first cooling holes 111 and a plurality of second cooling holes can also be arranged on the micro-mixing combustor 100. As shown in the embodiments of the present application, Figure 8 The first cooling holes 111 can be straight holes, each first cooling hole 111 extending from the air inlet end to the air outlet end of the micro-mixing combustor 100. The first cooling holes 111 can include a circle of first cooling holes 111 arranged outside the third micro-mixing zone 123, a plurality of first cooling holes 111 arranged near the position of the standby channel 110 close to the periphery, and each first cooling hole 111 arranged near the position of the micro-mixing rotational flow channel 114.

[0109] The second cooling holes can be inclined holes. The second cooling holes can be arranged at a position close to the air outlet end of the outer wall of the micro-mixing combustor 100. Each second cooling hole is uniformly distributed in the circumferential direction of the micro-mixing combustor 100, and each second cooling hole extends obliquely from the outer wall of the micro-mixing combustor 100 to the end face of the air outlet end.

[0110] By arranging a plurality of first cooling holes 111 and a plurality of second cooling holes, air flowing through each first cooling hole 111 and each second cooling hole can reduce the temperature of the micro-mixing combustor 100.

[0111] As shown in the embodiments of the present application, Figure 1 , Figure 2 , Figure 10 The nozzle also includes an end cover 151. The end cover 151 is used to connect each micro-mixing fuel injection rod 130 in the micro-mixing combustion to the high hydrogen-containing fuel channel in the gas turbine, and to connect each standby fuel injection rod 140 to the natural gas fuel channel and the high hydrogen-containing fuel channel in the gas turbine. As shown in the embodiments of the present application, the micro-mixing zone can be arranged in multiple groups. Therefore, each high hydrogen-containing fuel cavity corresponding to each micro-mixing zone can be arranged on the side of the end cover 151 close to the micro-mixing combustor 100. The air inlet end of the micro-mixing fuel injection rod 130 in each micro-mixing zone can be arranged in the corresponding high hydrogen-containing fuel cavity.

[0112] For each standby fuel injection rod 140, it can directly pass through the end cover 151 and be connected to the high hydrogen-containing fuel channel and the natural gas fuel channel corresponding to the gas turbine.

[0113] As shown in the embodiments of the present application, Figure 1 , Figure 2 ,Figure 10 As shown in the drawings, taking the example that the first micro-mixing area 121, the second micro-mixing area 122, the third micro-mixing area 123 and the four duty passages 110 are arranged, the end cover 151 can be provided with the first high hydrogen-containing fuel cavity 152, the second high hydrogen-containing fuel cavity 153 and the third high hydrogen-containing fuel cavity 154 on the side of the micro-mixing combustor 100. From the outside to the inside, the third high hydrogen-containing fuel cavity 154 surrounds the second high hydrogen-containing fuel cavity 153, the second high hydrogen-containing fuel cavity 153 surrounds the first high hydrogen-containing fuel cavity 152, and in the radial direction of the micro-mixing combustor 100, the first high hydrogen-containing fuel cavity 152, the second high hydrogen-containing fuel cavity 153 and the third high hydrogen-containing fuel cavity 154 correspond to the first micro-mixing area 121, the second micro-mixing area 122 and the third micro-mixing area 123 respectively. The end cover 151 is provided with the micro-mixing high hydrogen-containing fuel inlet 155 on the side away from the micro-mixing combustor 100 and at the positions corresponding to the first high hydrogen-containing fuel cavity 152, the second high hydrogen-containing fuel cavity 153 and the third high hydrogen-containing fuel cavity 154, and the micro-mixing high hydrogen-containing fuel inlet 155 is used for communicating with the high hydrogen-containing fuel passage of the gas turbine, and the number of the micro-mixing high hydrogen-containing fuel inlets 155 corresponding to the first high hydrogen-containing fuel cavity 152, the second high hydrogen-containing fuel cavity 153 and the third high hydrogen-containing fuel cavity 154 is not limited.

[0114] The nozzle in the embodiments of the present application can reduce the generation of nitrogen oxides by arranging the plurality of micro-mixing passages 120 and allowing the high hydrogen-containing fuel to form micro-mixing combustion based on the micro-mixing of the high hydrogen-containing fuel and air in the micro-mixing passage 120 and the reentry into the flame tube 180, and can avoid backfire when the high hydrogen-containing fuel flows out of the micro-mixing passage 120 with a small caliber at a high flow rate. The nozzle can ignite in a combination of premixing combustion and diffusion combustion by arranging the duty passage 110 and using the natural gas fuel sprayed from the duty fuel branch spray rod 143 and the natural gas flowing out of the first passage diffusion hole 144, so as to avoid the phenomenon of deflagration during ignition and be safer. In addition, the natural gas flowing out of the first passage diffusion hole 144 can burn more stably during diffusion combustion and can also play a role of flame stabilization, and the high hydrogen-containing fuel flowing out of the high hydrogen-containing fuel diffusion hole 145 can also burn stably during diffusion combustion and can also play a role of flame stabilization.

[0115] As shown in the drawings, Figure 1 , Figure 11 The present application further provides a gas turbine comprising the nozzle described in any of the above embodiments.

[0116] The gas turbine in the embodiments of the present application comprises the nozzle described in any of the above embodiments, and thus has at least the beneficial effects of the nozzle in the above embodiments, which will not be described herein.

[0117] As shown in the drawings, Figure 1 , Figure 2 , Figure 11In this embodiment of the application, the gas turbine further includes a flame tube 180, which is disposed at the gas outlet end of the micro-hybrid burner 100;

[0118] A flow guide bushing 170 is sleeved on the outside of the flame tube 180 and the micro-mixer burner 100. In the radial direction of the flame tube 180, there is a gap between the flow guide bushing 170 and the flame tube 180 and the micro-mixer burner 100. In the axial direction of the micro-mixer burner 100, there is a gap between the flow guide bushing 170 and the air inlet end of the micro-mixer burner 100.

[0119] A combustion cylinder 160 is fitted onto the end of the flow guide bushing 170 away from the micro-mixer burner 100. The combustion cylinder 160 is provided with an air inlet 161. The portion of the flow guide bushing 170 fitted inside the combustion cylinder 160 is provided with a flow straightening hole 171. The flame tube 180 is provided with a combustion mixing hole 181 at the end near the combustion cylinder 160.

[0120] like Figure 11 As shown in the embodiments of this application, in Figure 11 In the indicated orientation, the right end of the guide bushing 170 is located inside the combustion cylinder 160, and the left end is located outside the combustion cylinder 160. The flame tube 180 and the micro-mixer burner 100 are located inside the guide bushing 170. An air flow channel is formed between the outer wall of the flame tube 180 and the inner wall of the guide bushing 170. The right side of the flame tube 180 is the air outlet. A combustion mixing hole 181 is provided on the wall of the air outlet of the flame tube 180. Air enters the combustion cylinder 160 from the air inlet 161, and then enters the interior of the guide bushing 170 from the straightening hole 171. Part of the air enters the interior of the flame tube 180 along the combustion mixing hole 181, where it undergoes diffusion combustion with the fuel in the flame tube 180. The other part flows along the air flow channel to the micro-mixer burner 100 and enters each micro-mixing channel 120 and each duty channel 110 at the air inlet of the micro-mixer burner 100. The air flow direction is as follows: Figure 11 As shown by the blue arrows, the direction of the high-pressure gas flow after fuel and air combustion is as follows: Figure 10 As shown by the red arrow in the image.

[0121] like Figure 1 , Figure 2 As shown in this embodiment, the outer wall of the flame tube 180 is provided with a plurality of protruding ribs 182. The ribs 182 are arranged around the circumference of the flame tube 180, and each rib 182 is arranged axially in the flame tube 180. Gas film holes 183 are provided on the tube wall between adjacent ribs 182, and the gas film holes 183 communicate with the interior of the flame tube 180.

[0122] In the embodiment of the present application, the ribs 182 protruding from the wall of the flame tube 180 can increase the contact area between the flame tube 180 and the air in the air flow channel, so that the air in the air flow channel can have a better cooling effect on the flame tube 180. The air film holes 183 are arranged between the adjacent ribs 182, and the air can enter the flame tube 180 through the air film holes 183, so as to further improve the cooling effect.

[0123] In the embodiment of the present application, the air film hole 183 can be an inclined hole, for example, the air film hole 183 can penetrate from the outer wall of the flame tube 180 to the inside of the flame tube 180 in a direction inclined to the air outlet end of the flame tube 180. The inclined hole can increase the length of the air film hole penetrating the wall of the flame tube 180 and the air film cooling ability, so as to increase the cooling effect. In addition, for each air film hole 183, the inlet position of the air film hole 183 on the outer wall of the flame tube 180 can be arranged at the rib 182 closer to the air outlet end of the flame tube 180 among the two adjacent ribs 182. For the ribs 182 on the flame tube 180, each rib 182 is prone to generate a backflow area at the rib root away from the air outlet of the flame tube 180 due to the rib 182 itself, and the heat transfer effect of the backflow area is relatively small. Therefore, arranging the inlet position of the air film hole 183 in the backflow area close to the rib root can reduce the size of the backflow area, enhance the air flow disturbance of the backflow area, and further increase the cooling effect at the position.

[0124] The above description is only optional embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation based on the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

[0125] Based on the above embodiments, the present application at least provides the following technical solutions, but is not limited thereto:

[0126] 1. A nozzle, comprising:

[0127] a micro-mixing combustor, provided with at least one duty passage and a plurality of micro-mixing passages;

[0128] each of the micro-mixing passages is provided with a micro-mixing fuel injection rod, each of the micro-mixing fuel injection rods extends from the air inlet end of the micro-mixing combustor into the corresponding micro-mixing passage, and each of the micro-mixing fuel injection rods is used to deliver high-hydrogen fuel into the corresponding micro-mixing passage to form micro-mixing with the air in the corresponding micro-mixing passage;

[0129] Each of the duty fuel injection rods is located in the duty passage and close to the outer side wall of the micro-mixing combustor gas inlet end, and is provided with a plurality of duty fuel sub-injection rods; each of the duty fuel sub-injection rods on each duty fuel injection rod is communicated with the first passage in the duty fuel injection rod; each of the duty fuel sub-injection rods on each duty fuel injection rod is used to transport the natural gas fuel in the first passage of the duty fuel injection rod to the corresponding duty passage to form a premix with the air in the duty passage.

[0130] Each of the duty fuel injection rods is located in the duty passage and close to the outer side wall of the micro-mixing combustor gas inlet end, and is provided with a plurality of duty fuel sub-injection rods; each of the duty fuel sub-injection rods on each duty fuel injection rod is communicated with the first passage in the duty fuel injection rod; each of the duty fuel sub-injection rods on each duty fuel injection rod is used to transport the natural gas fuel in the first passage of the duty fuel injection rod to the corresponding duty passage to form a premix with the air in the duty passage.

[0131] Each of the duty fuel injection rods is located in the duty passage and close to the outer side wall of the micro-mixing combustor gas inlet end, and is provided with a plurality of duty fuel sub-injection rods; each of the duty fuel sub-injection rods on each duty fuel injection rod is communicated with the first passage in the duty fuel injection rod; each of the duty fuel sub-injection rods on each duty fuel injection rod is used to transport the natural gas fuel in the first passage of the duty fuel injection rod to the corresponding duty passage to form a premix with the air in the duty passage.

[0132] 2. The nozzle of claim 1, the first passage and the second passage in any of the duty fuel injection rods extend along an axial direction of the corresponding duty fuel injection rod, and in a radial direction of the duty fuel injection rod, the second passage surrounds the first passage.

[0133] The high hydrogen content fuel diffusion holes in any of the duty fuel injection rods are provided with a plurality of high hydrogen content fuel diffusion holes, and in a radial direction of any of the duty fuel injection rods, the high hydrogen content fuel diffusion holes on the duty fuel injection rod surround the first passage diffusion hole on the duty fuel injection rod.

[0134] 3. The nozzle of claim 1 or 2, in a flow direction of the natural gas, the first passage comprises an inlet passage, a transition passage, and an outlet passage, a diameter of the transition passage is smaller than diameters of the inlet passage and the outlet passage, and the diameter of the transition passage is greater than or equal to a diameter of the first passage diffusion hole.

[0135] 4. The nozzle of any of claims 1-3, each of the duty fuel injection rods is located in the duty passage and close to the outer side wall of the micro-mixing combustor gas inlet end, and is provided with a plurality of swirl vanes.

[0136] 5. The nozzle of any of claims 1-4, the micro-mixing fuel injection rod is located on the side wall of the micro-mixing passage and is provided with at least one group of high hydrogen content fuel injection holes, each high hydrogen content fuel injection hole in the same group is uniformly arranged along a circumferential direction of the micro-mixing fuel injection rod, and each high hydrogen content fuel injection hole in adjacent groups is arranged in a staggered manner in the circumferential direction of the micro-mixing fuel injection rod.

[0137] 6. The nozzle of any one of claims 1-5, wherein the end of the micro-mixing fuel rod located within the micro-mixing channel is provided with a plurality of swirl grooves, each of the swirl grooves extending from the end of the micro-mixing fuel rod to an outer sidewall of the micro-mixing fuel rod.

[0138] 7. The nozzle of any one of claims 1-6, wherein the plurality of duty passages comprises a central duty passage and a plurality of peripheral duty passages, each of the innermost micro-mixing channels surrounds the central duty passage in a radial direction of the micro-mixing combustor, each of the peripheral duty passages is located between the innermost micro-mixing channel and the outermost micro-mixing channel, and each of the peripheral duty passages is uniformly distributed in a circumferential direction of the micro-mixing combustor.

[0139] 8. The nozzle of any one of claims 1-7, wherein each of the micro-mixing channels is divided into a plurality of micro-mixing zones, and the plurality of micro-mixing zones are sequentially arranged from inside to outside in the radial direction of the micro-mixing combustor.

[0140] 9. The nozzle of any one of claims 1-8, wherein the plurality of micro-mixing zones comprises a first micro-mixing zone, a second micro-mixing zone, and a third micro-mixing zone.

[0141] the first micro-mixing zone surrounds the central duty passage, the second micro-mixing zone surrounds the first micro-mixing zone, and the third micro-mixing zone surrounds the second micro-mixing zone.

[0142] In the radial direction of the micro-mixing combustor, each of the peripheral duty passages is located outside the first micro-mixing zone.

[0143] 10. The nozzle of any one of claims 1-9, wherein each of the micro-mixing channels in the third micro-mixing zone is provided with a chamfer at an edge of an air inlet end of the micro-mixing combustor.

[0144] 11. The nozzle of any one of claims 1-10, wherein the micro-mixing channel is provided with a plurality of micro-mixing swirl passages, each of the micro-mixing swirl passages is uniformly distributed in the circumferential direction of the micro-mixing combustor, and a portion of each of the micro-mixing swirl passages close to an air outlet end of the micro-mixing combustor is a compound angle to enable gas in each of the micro-mixing swirl passages to swirl and exit.

[0145] 12. A gas turbine comprising the nozzle of any one of claims 1-11.

[0146] 13. The gas turbine of claim 12, further comprising:

[0147] a flame tube provided at an air outlet end of the micro-mixing combustor.

[0148] A flow guide sleeve is sleeved outside the flame tube and the micro-mix combustor, and has a gap with the flame tube and the micro-mix combustor in the radial direction of the flame tube, and has a gap with the air inlet end of the micro-mix combustor in the axial direction of the micro-mix combustor;

[0149] A combustion cylinder is sleeved at one end of the flow guide sleeve away from the micro-mix combustor, the combustion cylinder is provided with an air inlet, and the part of the flow guide sleeve sleeved in the combustion cylinder is provided with a flow regulating hole, and one end of the flame tube close to the combustion cylinder is provided with a combustion mixing hole.

[0150] 14. The gas turbine of claim 12 or 13, further comprising:

[0151] A plurality of raised ribs are arranged on the outer wall of the flame tube, the ribs are arranged in a ring shape along the circumference of the flame tube, each of the ribs is arranged in the axial direction of the flame tube, and the cylinder wall between adjacent ribs is provided with a film hole, and the film hole is connected to the inside of the flame tube.

Claims

1. A nozzle characterized by, The application relates to a micro-mixing combustor, comprising: a micro-mixing combustor, which is provided with at least one value channel and a plurality of micro-mixing channels; each of the micro-mixing channels is provided with a micro-mixing fuel injection rod, each of the micro-mixing fuel injection rods extends from the air inlet end of the micro-mixing combustor into the corresponding micro-mixing channel, and each of the micro-mixing fuel injection rods is used for conveying high-hydrogen-content fuel into the corresponding micro-mixing channel to form micro-mixing with air in the corresponding micro-mixing channel; each of the value channels is provided with a value fuel injection rod, each of the value fuel injection rods extends along the corresponding value channel to the air outlet end of the micro-mixing combustor, the value fuel injection rod is provided with a first channel and a second channel, the first channel is used for conveying at least natural gas fuel, and the second channel is used for conveying high-hydrogen-content fuel; each of the value fuel injection rods is located in the value channel and is close to the outer side wall of the air inlet end of the micro-mixing combustor, and is provided with a plurality of value fuel branch injection rods; each of the value fuel branch injection rods on each value fuel injection rod is communicated with the first channel in the value fuel injection rod; each of the value fuel branch injection rods on each value fuel injection rod is used for conveying natural gas fuel in the first channel of the value fuel injection rod into the corresponding value channel to form pre-mixing with air in the value channel; the end of each of the value fuel injection rods close to the air outlet end of the micro-mixing combustor is provided with a first channel diffusion hole and a high-hydrogen-content fuel diffusion hole, the first channel diffusion hole on each value fuel injection rod is communicated with the first channel in the value fuel injection rod, and the high-hydrogen-content fuel diffusion hole on each value fuel injection rod is communicated with the second channel in the value fuel injection rod.

2. The nozzle of claim 1, wherein The first channel and the second channel in any value fuel injection rod extend along the axial direction of the corresponding value fuel injection rod, and in the radial direction of the value fuel injection rod, the second channel surrounds the first channel; any value fuel injection rod is provided with a plurality of high-hydrogen-content fuel diffusion holes, and in the radial direction of any value fuel injection rod, each high-hydrogen-content fuel diffusion hole on the value fuel injection rod surrounds the first channel diffusion hole on the value fuel injection rod.

3. The nozzle of claim 2, wherein In the flow direction of the natural gas, the first channel comprises an inlet channel, a transition channel and an outlet channel, the diameter of the transition channel is smaller than the diameters of the inlet channel and the outlet channel, and the diameter of the transition channel is greater than or equal to the diameter of the first channel diffusion hole.

4. The nozzle of claim 1, wherein each of the value fuel injection rods located in the value channel and close to the outer side wall of the air outlet end of the micro-mixing combustor is provided with a plurality of swirl vanes.

5. The nozzle of claim 1, wherein The micro-mixing fuel injection rod located in the side wall of the micro-mixing channel is provided with at least one group of high-hydrogen-content fuel injection holes, each high-hydrogen-content fuel injection hole in the same group is uniformly arranged in the circumferential direction of the micro-mixing fuel injection rod, and each high-hydrogen-content fuel injection hole in adjacent groups is arranged in a staggered mode in the circumferential direction of the micro-mixing fuel injection rod.

6. The nozzle of claim 1, wherein The end of the micro-mixing fuel injection rod located in the micro-mixing channel is provided with a plurality of swirl grooves, and each of the swirl grooves extends from the end of the micro-mixing fuel injection rod to the outer side wall of the micro-mixing fuel injection rod.

7. The nozzle of claim 1 wherein, The plurality of duty passages include a central duty passage and a plurality of peripheral duty passages, in a radial direction of the micro-mix burner, each of the innermost micro-mix passages surrounds the central duty passage, and each of the peripheral duty passages is located between the innermost micro-mix passage and the outermost micro-mix passage, in a circumferential direction of the micro-mix burner, each of the peripheral duty passages is uniformly distributed.

8. The nozzle of claim 7, wherein Each of the micro-mix passages is divided into a plurality of micro-mix zones, which are sequentially arranged from inside to outside in a radial direction of the micro-mix burner.

9. The nozzle of claim 8, wherein The plurality of micro-mix zones include a first micro-mix zone, a second micro-mix zone, and a third micro-mix zone. The first micro-mix zone surrounds the central duty passage, the second micro-mix zone surrounds the first micro-mix zone, and the third micro-mix zone surrounds the second micro-mix zone. In a radial direction of the micro-mix burner, each of the peripheral duty passages is located outside the first micro-mix zone.

10. A gas turbine engine characterized by, A nozzle as claimed in any one of claims 1 to 9.

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