Anti-backfire nozzle and hydrogen combustion gas turbine

Abstract

The present application belongs to hydrogen combustion gas turbine technical field, disclose a kind of anti-backfire nozzle and hydrogen combustion gas turbine, the anti-backfire nozzle includes shell and piston assembly, medium chamber is equipped in shell interior, the inner wall of shell is also opened with each other intercommunication Tesla valve passage and piston slide, the inlet of Tesla valve passage is communicated with medium chamber, piston assembly includes isolating disc and piston plate, isolating disc is slidably arranged in medium chamber, and medium chamber is divided into first chamber and second chamber, piston plate is slid in piston slide with isolating disc synchronous sliding. When backfire occurs, its impact force promotes isolating disc to drive piston plate to slide in piston slide, form low pressure zone at the inlet of Tesla valve passage, mixed fuel is inhaled, to reduce the concentration of mixed fuel in second chamber, reduce backfire, and also can be backfire flame is inhaled into Tesla valve passage, so that backfire flame in the process of flowing, mutually clash, to reduce the risk of backfire.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen-fueled gas turbines, and particularly relates to a backfire-proof nozzle and a hydrogen-fueled gas turbine. BACKGROUND

[0002] Safety and reliability are the main challenges in the development of future low-carbon energy systems, and large-scale renewable energy grid connection requires large-capacity and highly flexible power supply. The application of hydrogen-fueled gas turbines can improve the rate of renewable energy, smooth the fluctuation of power grid, reduce CO2 emissions, and help reduce energy imports and reduce power generation costs. The low-pollution combustion technology of natural gas turbines mainly includes diffusion combustion with diluent injection and dry low-pollution combustion without diluent injection. Due to the advantages of stable operation and simple fuel regulation strategy, diffusion combustion technology is widely used in natural gas turbines, but it seriously affects the power generation efficiency of the unit, and this combustion method can only reduce the NO x emission to the level of 15-25*10 -6 (volume fraction, the same below), and the injection of excessive diluent will also cause combustion instability, combustion efficiency reduction, and reduction of the service life of hot-end components. Therefore, in order to reduce NO x emission and improve the power generation efficiency of the unit, hydrogen-fueled gas turbines are gradually adopted. The application of hydrogen-fueled gas turbines can improve the rate of renewable energy, smooth the fluctuation of power grid, reduce CO2 emissions, and help reduce energy imports and reduce power generation costs.

[0003] In order to reduce the generation of NO x in combustion, hydrogen-fueled gas turbines usually adopt premixed combustion method, but such mixing method will increase the risk of backfire when using hydrogen-containing fuel. For the gas turbine that burns natural gas, the air supplied by the compressor enters the combustion chamber and flows through the swirler to generate a swirling flow. The fuel is injected from the small holes opened on the surface of the swirler blade, and is rapidly mixed with the surrounding air by the swirling field. There is a central area of low-flow backflow in the flow field of fuel and air, and the flame moves upstream in the low-flow area of backflow center, causing backfire. When natural gas and hydrogen are mixed, the change of fuel components causes the change of flame characteristics. Compared with natural gas fuel alone, hydrogen-rich fuel burns faster and the fuel injection flame area is shorter, which is more prone to combustion chamber backfire. Therefore, when backfire occurs in the gas turbine combustor, the upstream uncooled components are burned, causing equipment damage and seriously affecting the safety of hydrogen-fueled gas turbines. SUMMARY

[0004] The present application aims to provide a backfire-proof nozzle and a hydrogen-fueled gas turbine, which has low backfire risk and high safety.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] In one aspect, a backfire-proof nozzle is provided, which is in communication with a flame tube and comprises:

[0007] A housing, which is internally provided with a medium chamber for mixing fuel flow, and is further provided with a Tesla valve channel and a piston slide on the inner wall of the housing, the inlet of the Tesla valve channel being in communication with the medium chamber, and the outlet of the Tesla valve channel being in communication with the piston slide;

[0008] A piston assembly, which comprises a partition disc and a piston plate, the partition disc being slidably arranged in the medium chamber and separating the medium chamber into a first chamber and a second chamber, the first chamber being used for introducing the mixed fuel, the flame tube and the inlet of the Tesla valve channel both being in communication with the second chamber, and the piston plate being connected with the partition disc and synchronously sliding with the partition disc in the piston slide.

[0009] Optionally, the piston assembly further comprises a sliding plate, a first elastic member and a spring piece, the sliding plate being slidably arranged in the first chamber, the spring piece being arranged on the inner wall of the first chamber, the side of the sliding plate away from the partition disc being in abutment with the spring piece, and the first elastic member being clamped between the sliding plate and the partition disc.

[0010] Optionally, the side of the sliding plate close to the spring piece is provided with a sliding slope, and the sliding slope is in abutment with the spring piece.

[0011] Optionally, the piston assembly further comprises a protective sleeve, which is sleeved on the outside of the first elastic member.

[0012] Optionally, the piston assembly further comprises at least one rotating rod and a helical blade, at least one of the rotating rods being arranged through the partition disc, the rotating rod being rotated with the sliding of the partition disc, the rotating rod being connected with the helical blade on the part of the second chamber, and the helical blade being used for driving the mixed fuel to flow towards the partition disc.

[0013] Optionally, the rotating rod is provided with a helical groove on the part of the first chamber, the partition disc is provided with a rotating through hole corresponding to the rotating rod, and the piston assembly further comprises a driving rod, one end of the driving rod being fixedly arranged on the inner wall of the rotating through hole, and the other end of the driving rod being slidably arranged in the helical groove.

[0014] Optionally, the piston assembly further comprises a first sealing plate, a force receiving plate and a second elastic member, the first sealing plate is slidably arranged at the inlet of the Tesla valve passage, the first sealing plate has an open position and a closed position, when the first sealing plate is in the open position, the Tesla valve passage is in communication with the medium chamber, when the first sealing plate is in the closed position, the Tesla valve passage is disconnected from the medium chamber, the force receiving plate is connected to one side of the first sealing plate facing the rotating rod, the rotating rod is provided with a striking protrusion abutting against the force receiving plate, the rotating rod is used to drive the first sealing plate to slide from the closed position to the open position, and the second elastic member is clamped between the first sealing plate and the inner wall of the medium chamber, and the second elastic member is configured to make the first sealing plate have a movement tendency of always sliding from the open position to the closed position.

[0015] Optionally, the piston assembly further comprises a second sealing plate and a third elastic member, the isolation disc is provided with a medium flow channel connecting the first chamber and the second chamber, the inlet of the medium flow channel is located in the first chamber, the outlet of the medium flow channel is located in the second chamber, the second sealing plate is slidably arranged in the medium flow channel and used to close the inlet of the medium flow channel, and the third elastic member is arranged in the isolation disc and configured to make the second sealing plate have a movement tendency of always moving away from the inlet of the medium flow channel.

[0016] Optionally, the piston assembly further comprises a sealing member clamped between the piston plate and the inner wall of the piston slide.

[0017] In another aspect, a hydrogen-fueled gas turbine is provided, which comprises the anti-backfire nozzle as claimed in any one of the preceding aspects.

[0018] The present application has the following advantages:

[0019] The present application provides an anti-backfire nozzle, by arranging a Tesla valve passage and a piston slide in communication with a medium chamber on the inner wall of a shell, so that when backfire occurs, the impact force of the backfire pushes the isolation disc to drive the piston plate to slide in the piston slide, a low-pressure area is formed at the inlet of the Tesla valve passage, the mixed fuel is sucked in, the concentration of the mixed fuel in the second chamber is reduced, thereby reducing backfire, and the flame of the backfire can also be sucked into the Tesla valve passage, and the structural characteristics of the Tesla valve passage are utilized, so that the flames of the backfire collide with each other during flow, thereby eliminating backfire, to achieve the purpose of reducing the risk of backfire.

[0020] The present application also provides a hydrogen-fueled gas turbine, by connecting the anti-backfire nozzle to the flame tube, when backfire occurs, the anti-backfire nozzle is used to eliminate backfire, thereby protecting the hydrogen-fueled gas turbine without cooling components, reducing the damage of backfire, and improving the safety of the hydrogen-fueled gas turbine. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is the connection schematic diagram of the anti-backfire nozzle and the flame tube of the present application;

[0022] Figure 2 is the first perspective view of the anti-backfire nozzle of the present application;

[0023] Figure 3 is Figure 2 is the enlarged view of part A in the figure;

[0024] Figure 4 is Figure 2 is the enlarged view of part B in the figure;

[0025] Figure 5 is the second perspective view of the anti-backfire nozzle of the present application.

[0026] In the figure:

[0027] 100, flame tube;

[0028] 1, shell; 11, medium chamber; 111, first chamber; 112, second chamber; 12, Tesla valve channel; 13, barrel; 14, front end cover; 141, medium inlet; 15, rear end cover; 151, medium outlet; 16, square hole;

[0029] 2, piston assembly; 201, isolation disc; 202, piston plate; 203, sliding plate; 204, first elastic member; 205, elastic sheet; 206, pull rod; 207, push rod; 208, protective sleeve; 209, rotating rod; 2091, spiral groove; 2092, striking protrusion; 210, spiral blade; 211, driving rod; 212, first sealing plate; 213, stress plate; 214, second elastic member; 215, second sealing plate; 216, third elastic member. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the present application, and not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, not all structures.

[0031] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] In order to reduce the risk of tempering and improve the safety of the equipment, the present embodiment provides a tempering-proof nozzle which communicates with the flame tube 100.

[0035] As shown in Figures 1 to 5 The tempering-proof nozzle includes a housing 1 and a piston assembly 2, the housing 1 is internally provided with a medium chamber 11 for mixing fuel flow, and the inner wall of the housing 1 is further provided with a Tesla valve channel 12 and a piston slide, the inlet of the Tesla valve channel 12 communicates with the medium chamber 11, the outlet of the Tesla valve channel 12 communicates with the piston slide, the piston assembly 2 includes a partition disc 201 and a piston plate 202, the partition disc 201 is slidably arranged in the medium chamber 11 and divides the medium chamber 11 into a first chamber 111 and a second chamber 112, the first chamber 111 is used for introducing mixed fuel, the flame tube 100 and the inlet of the Tesla valve channel 12 both communicate with the second chamber 112, and the piston plate 202 is connected with the partition disc 201 and slides synchronously with the partition disc 201 in the piston slide.

[0036] By setting the Tesla valve channel 12 and the piston slide on the inner wall of the shell 1, which communicates with the medium chamber 11, when backfire occurs, the impact force of the backfire pushes the isolation disc 201 to drive the piston plate 202 to slide in the piston slide, a low pressure area is formed at the entrance of the Tesla valve channel 12, the mixed fuel is sucked in, the concentration of the mixed fuel in the second chamber 112 is reduced, thereby reducing backfire, and the flame of backfire can also be sucked into the Tesla valve channel 12, and by the structural characteristics of the Tesla valve channel 12, the flames of backfire collide with each other during the flow, thereby eliminating backfire, so as to reduce the risk of backfire.

[0037] In the embodiment, the shell 1 includes a cylinder body 13, a front end cover 14 and a rear end cover 15, the front end cover 14 and the rear end cover 15 are respectively arranged on the two sides of the cylinder body 13, thereby forming the shell 1 with the medium chamber 11, when the isolation disc 201 is placed in the medium chamber 11, a space surrounded by the isolation disc 201 and the front end cover 14 is the first chamber 111, the front end cover 14 is provided with a medium inlet 141 which communicates with the first chamber 111, a space surrounded by the isolation disc 201 and the rear end cover 15 is the second chamber 112, the rear end cover 15 is provided with a medium outlet 151 which communicates with the second chamber 112, and the flame tube 100 communicates with the second chamber 112 through the medium outlet 151. In order to facilitate processing and manufacturing, in the embodiment, the cylinder body 13 can be manufactured by an integral molding process, the Tesla valve channel 12 and the piston slide are manufactured directly when the cylinder body 13 is formed, thereby avoiding subsequent processing of the cylinder body 13, and reducing the manufacturing difficulty and cost.

[0038] In addition, the Tesla valve channel 12 and the piston slide which communicates with the Tesla valve channel 12 can be provided with multiple groups according to the needs, thereby accelerating the efficiency of eliminating backfire, in the embodiment, two groups of Tesla valve channels 12 and piston slides are provided on the inner wall of the shell 1, one piston plate 202 is provided in each piston slide, and the two piston plates 202 are connected to the isolation disc 201, so that the isolation disc 201 is pushed by the impact force of backfire to drive the two piston plates 202 to slide in the respective piston slides at the same time, the volume is increased, the pressure of the air in the corresponding piston slide and the Tesla valve channel 12 is reduced, a low pressure area is formed at the entrance of the Tesla valve channel 12, thereby sucking the mixed fuel in the second chamber 112, reducing the concentration of the mixed fuel in the second chamber 112, achieving the purpose of reducing backfire, and the flame of backfire can also be sucked into the Tesla valve channel 12 at the same time, by the structural characteristics of the Tesla valve channel 12, the flames of backfire collide with each other during the flow, thereby eliminating backfire, so as to reduce the risk of backfire.

[0039] Optionally, as Figure 5As shown, the piston assembly 2 further comprises a sliding plate 203, a first elastic member 204 and a spring plate 205, the sliding plate 203 is slidably arranged in the first chamber 111, the spring plate 205 is arranged on the inner wall of the first chamber 111, the side of the sliding plate 203 away from the isolation disc 201 abuts against the spring plate 205, and the first elastic member 204 is clamped between the sliding plate 203 and the isolation disc 201. By arranging the first elastic member 204 and the spring plate 205 on the two sides of the isolation disc 201 respectively, when the isolation disc 201 is subjected to the impact of backfire, the isolation disc 201 will first compress the first elastic member 204 between the isolation disc 201 and the sliding plate 203 due to the resistance of the spring plate 205 to the isolation disc 201, and when the sum of the impact force and the elastic force of the first elastic member 204 is greater than the resistance of the spring plate 205 to the isolation disc 201, the isolation disc 201 extrudes the spring plate 205, so that the spring plate 205 deforms and no longer blocks the isolation disc 201, and under the action of the impact force and the elastic force, the isolation disc 201 rapidly drives the piston plate 202 to slide in the piston slide, thereby increasing the suction of the inlet of the Tesla valve passage 12 to the mixed fuel and the backfire.

[0040] In the present embodiment, two piston plates 202 are arranged, in order to ensure that the isolation disc 201 drives the two piston plates to move simultaneously, the piston assembly 2 further comprises two pull rods 206, the two ends of the sliding plate 203 are connected to the corresponding piston plate 202 through one of the pull rods 206 respectively, so as to realize the linkage of the isolation disc 201 and the piston plate 202. The linkage structure is relatively simple, the arrangement is clear, the manufacturing and assembling cost is relatively low, and the economic benefit is relatively high. In order to facilitate the connection of the first elastic member 204 to the sliding plate 203 and the isolation disc 201, the piston assembly 2 further comprises a push rod 207, the push rod 207 is connected to the sliding plate 203, one end of the first elastic member 204 is connected to the isolation disc 201, and the other end of the first elastic member 204 is connected to the push rod 207.

[0041] Optionally, the side of the sliding plate 203 close to the spring plate 205 is provided with a sliding slope, and the sliding slope abuts against the spring plate 205. By arranging the sliding slope abutting against the spring plate 205 on the side of the sliding plate 203 close to the spring plate 205, it is convenient for the sliding plate 203 to extrude the spring plate 205 to deform under the action of the impact force and the elastic force of the first elastic member 204. In the present embodiment, the first elastic member 204 is a spring, and the spring plate 205 is a circular arc-shaped elastic metal sheet.

[0042] Further, Figure 1 , Figure 2 , Figure 5As shown, the piston assembly 2 further comprises a protective sleeve 208 sleeved on the outside of the first elastic member 204. Since there is mixed fuel in the medium chamber 11, by arranging the protective sleeve 208 on the outside of the first elastic member 204, corrosion of the first elastic member 204 by the mixed fuel is avoided. In this embodiment, one end of the protective sleeve 208 is connected to the push rod 207, and the other end is connected to the isolation disc 201.

[0043] Optionally, as shown in Figure 1 , Figure 2 As shown, the piston assembly 2 further comprises at least one rotating rod 209 and a spiral blade 210, the at least one rotating rod 209 is arranged through the isolation disc 201, the rotating rod 209 rotates with the sliding of the isolation disc 201, and the spiral blade 210 is connected to the rotating rod 209 located on the part of the second chamber 112, and the spiral blade 210 is used to drive the mixed fuel to flow towards the isolation disc 201. When the impact force of the backfire pushes the isolation disc 201 to slide, at this time the rotating rod 209 is driven by the isolation disc 201 to rotate, thereby making the mixed fuel in the second chamber 112 flow towards the isolation disc 201, and separating from the mixed fuel in the flame tube 100, thereby playing a role in reducing backfire.

[0044] In this embodiment, two rotating rods 209 are arranged through the isolation disc 201, and when the impact force of the backfire pushes the isolation disc to slide, the two spiral blades 210 are simultaneously rotated, thereby enhancing the driving force of the mixed fuel. In order to enhance the fixing strength of the two rotating rods 209, a circular groove corresponding to the rotating rod 209 is arranged on the front end cover 14 and the rear end cover 15, one end of the rotating rod 209 is inserted into the circular groove of the front end cover 14, and the other end is sequentially inserted through the sliding plate 203, the isolation disc 201 and finally inserted into the circular groove of the rear end cover 15, wherein the hole diameter of the circular groove is slightly larger than the rod diameter of the rotating rod 209, so that the rotating rod 209 can normally rotate in the circular groove. In addition, the spiral blade 210 and the rotating rod 209 can be designed separately, the spiral blade 210 is subsequently fixedly connected to the rotating rod 209 through a connecting structure, or the structure of the spiral blade 210 can be directly machined when the rotating rod 209 is machined, thereby simplifying the subsequent assembly steps.

[0045] Further, as shown in Figure 2 , Figure 3As shown, the rotating rod 209 is provided with a spiral groove 2091 on the part of the first chamber 111, the isolation disc 201 is provided with a rotating through hole corresponding to the rotating rod 209, and the piston assembly 2 further comprises a driving rod 211, one end of the driving rod 211 is fixedly arranged on the inner wall of the rotating through hole, and the other end of the driving rod 211 is slidably arranged in the spiral groove 2091. When the driving rod 211 slides with the isolation disc 201, the driving rod 211 cannot rotate, so that when the driving rod 211 slides along the spiral groove 2091, the rotating rod 209 is forced to rotate with the sliding of the isolation disc 201, so that the linkage of the isolation disc 201 and the rotating rod 209 is realized. The rotation of the rotating rod 209 is driven by the impact force of tempering, and no power member for driving the rotation of the rotating rod 209 needs to be additionally arranged, so that the cost is reduced and the energy utilization rate is improved. In the embodiment, the length of the spiral groove 2091 is designed to also play a limiting role, so as to avoid the sliding of the isolation disc 201 beyond the limit and cause damage to the device.

[0046] Optionally, as shown in Figure 1 、 Figure 2 、 Figure 4 shown, the piston assembly 2 further comprises a first sealing plate 212, a stress plate 213 and a second elastic member 214, the first sealing plate 212 is slidably arranged at the entrance of the Tesla valve channel 12, the first sealing plate 212 has an opening position and a closing position, when the first sealing plate 212 is in the opening position, the Tesla valve channel 12 is in communication with the medium chamber 11, when the first sealing plate 212 is in the closing position, the Tesla valve channel 12 is disconnected from the medium chamber 11, the stress plate 213 is connected to one side of the first sealing plate 212 facing the rotating rod 209, the rotating rod 209 is provided with a striking protrusion 2092 abutting against the stress plate 213, and the rotating rod 209 is used to drive the first sealing plate 212 to slide from the closing position to the opening position, the second elastic member 214 is clamped between the first sealing plate 212 and the inner wall of the medium chamber 11, and the second elastic member 214 is configured to make the first sealing plate 212 have a motion trend of always sliding from the opening position to the closing position. By arranging the first sealing plate 212 at the entrance of the Tesla valve channel 12, the opening and closing of the entrance of the Tesla valve channel 12 are realized under the driving of the second elastic member 214 and the rotating rod 209, when tempering occurs, the first sealing plate 212 is driven by the rotating rod 209 to open the entrance of the Tesla valve channel 12, and when tempering does not occur, the first sealing plate 212 is driven by the second elastic member 214 to keep the entrance of the Tesla valve channel 12 closed, so that the mixed fuel is prevented from entering the Tesla valve channel 12.

[0047] In the embodiment, a square hole 16 is formed on the inner wall of the shell 1, the square hole 16 is used for connecting the inlet of the Tesla valve channel 12 and the medium chamber 11, a first sealing plate 212 is slidably arranged at the joint of the square hole 16 and the medium chamber 11, a square groove is formed on the first sealing plate 212, when the first sealing plate 212 is in the open position, the square hole 16 is communicated with the medium chamber 11 through the square groove, when the first sealing plate 212 is in the closed position, the plate body of the first sealing plate 212 closes the square hole 16, and the square hole 16 and the medium chamber 11 are isolated. A plurality of impact protrusions 2092 are arranged on the rotating rod 209, so that when the rotating rod 209 rotates, the impact protrusions 2092 constantly hit the stress plate 213, so that the stress plate 213 constantly pulls the first sealing plate 212 to slide, so that the square groove on the first sealing plate 212 constantly coincides with the square hole 16, and a better blocking effect is achieved.

[0048] Optionally, as shown in Figure 1 、 Figure 5 , the piston assembly 2 further comprises a second sealing plate 215 and a third elastic member 216, the isolation disc 201 is provided with a medium flow channel connecting the first chamber 111 and the second chamber 112, the inlet of the medium flow channel is located in the first chamber 111, and the outlet of the medium flow channel is located in the second chamber 112. The second sealing plate 215 is slidably arranged in the medium flow channel and is used for closing the inlet of the medium flow channel, and the third elastic member 216 is arranged in the isolation disc 201 and is configured to make the second sealing plate 215 have a movement tendency of always moving away from the inlet of the medium flow channel. By arranging the second sealing plate 215 on the isolation disc 201, when the impact force of tempering is applied to the isolation disc 201 and the second sealing plate 215, the second sealing plate 215 slides in the medium flow channel and finally abuts against the inlet of the medium flow channel, so as to close the inlet of the medium flow channel and close the isolation disc 201, thereby playing a role of blocking tempering.

[0049] In the embodiment, in order to ensure the flow speed of the mixed fuel, two circular-arc-shaped medium channels are formed on the isolation disc 201, and two circular-arc-shaped second sealing plates 215 are correspondingly arranged, and in order to realize that the second sealing plate 215 closes the inlet of the medium flow channel, the area of the second sealing plate 215 is greater than the opening area of the inlet of the medium flow channel, and in order to ensure that the mixed fuel can smoothly flow from the first chamber 111 to the second chamber 112 through the isolation disc 201, the opening area of the outlet of the medium flow channel is greater than the area of the second sealing plate 215, and when the second sealing plate 215 does not receive external force, the second sealing plate 215 is located in the outlet of the medium flow channel under the action of the third elastic member 216, and the mixed fuel flows through the gap between the second sealing plate 215 and the outlet of the medium flow channel.

[0050] Optionally, the piston assembly 2 further comprises a sealing member, which is clamped between the piston plate 202 and the inner wall of the piston slide. By arranging the sealing member between the piston plate 202 and the piston slide, the air tightness in the piston slide is ensured, and the gap between the piston plate 202 and the piston slide is avoided to cause air leakage, so that the suction force at the inlet of the Tesla valve passage 12 cannot be generated.

[0051] In actual work, when backfire occurs, the impact force of the backfire acts on the isolation disc 201 and the second sealing plate 215, the second sealing plate 215 is pressed against the third elastic member 216 under the action of the impact force, and the inlet of the medium flow channel is blocked, so that the isolation disc 201 is closed. At this time, the isolation disc 201 is compressed against the first elastic member 204 under the action of the impact force, and slides towards the first chamber 111, and at the same time of sliding, the driving rod 211 in the rotating hole of the isolation disc 201 slides along the spiral groove 2091 on the rotating rod 209, drives the rotating rod 209 to rotate, and thus drives the spiral vane 210 in the second chamber 112 to rotate, reversely transports the mixed fuel, separates the mixed fuel from the mixed fuel in the flame tube 100, and reduces the backfire. At the same time of rotating, the striking protrusion 2092 outside the rotating rod 209 is also rotated, the striking protrusion 2092 acts on the stress plate 213, drives the first sealing plate 212 to compress the second elastic member 214, so that the square groove on the first sealing plate 212 is communicated with the square hole 16, and the square hole 16 is opened. At this time, the isolation disc 201 is further moved towards the first chamber 111 under the action of the impact force, and continuously pushes the sliding plate 203, so that the sliding plate 203 is compressed against the spring 205 to deform. At this time, under the double actions of the elastic force of the first elastic member 204 and the impact force of the backfire, the sliding plate 203 is quickly moved towards the first chamber 111, the sliding plate 203 drives the pull rod 206 to pull the piston plate 202 to slide in the piston slide, and a low pressure area is formed at the square hole 16, so that the backfire is sucked into the Tesla valve passage 12. By using the structural characteristics of the Tesla valve passage 12, the backfire is continuously collided with each other, and finally the function of extinguishing the fire is achieved.

[0052] When the backfire does not occur, the second sealing plate 215 is located at the outlet of the medium passage under the action of the third elastic member 216, the mixed fuel can flow from the first chamber 111 to the second chamber 112 through the gap between the second sealing plate 215 and the outlet of the medium passage, and finally enters the flame tube 100. At this time, the first sealing plate 212 is in a closed position under the action of the second elastic member 214, and the plate body of the first sealing plate 212 closes the square hole 16, so that the mixed fuel in the second chamber 112 cannot enter the Tesla valve passage 12 through the square hole 16.

[0053] In the embodiment, a hydrogen-fueled gas turbine is also provided. The hydrogen-fueled gas turbine applies the above-mentioned anti-backfire nozzle on the flame tube 100. When backfire occurs, the anti-backfire nozzle is used to eliminate the backfire, thereby protecting the hydrogen-fueled gas turbine from the cooling components, reducing the damage of backfire, and improving the safety of the hydrogen-fueled gas turbine.

[0054] Obviously, the above-mentioned embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A backfire prevention nozzle, wherein the backfire prevention nozzle is connected to a flame tube (100), characterized in that, The anti-backfire nozzle includes: The housing (1) has a medium chamber (11) inside for the flow of mixed fuel. The inner wall of the housing (1) also has a Tesla valve passage (12) and a piston slide. The inlet of the Tesla valve passage (12) is connected to the medium chamber (11), and the outlet of the Tesla valve passage (12) is connected to the piston slide. Piston assembly (2), the piston assembly (2) includes an isolation disc (201) and a piston plate (202), the isolation disc (201) is slidably disposed in the medium chamber (11) and divides the medium chamber (11) into a first chamber (111) and a second chamber (112), the first chamber (111) is used to introduce the mixed fuel, the inlet of the flame tube (100) and the Tesla valve channel (12) are both connected to the second chamber (112), the piston plate (202) is connected to the isolation disc (201) and slides synchronously with the isolation disc (201) in the piston slide; The piston assembly (2) further includes a sliding plate (203), a first elastic element (204), and a spring plate (205). The sliding plate (203) is slidably disposed in the first chamber (111), and the spring plate (205) is disposed on the inner wall of the first chamber (111). The side of the sliding plate (203) facing away from the isolation plate (201) abuts against the spring plate (205), and the first elastic element (204) is sandwiched between the sliding plate (203) and the isolation plate (201).

2. The anti-backfire nozzle according to claim 1, characterized in that, The sliding plate (203) has a sliding ramp on the side near the spring piece (205), and the sliding ramp abuts against the spring piece (205).

3. The anti-backfire nozzle according to claim 1, characterized in that, The piston assembly (2) further includes a protective sleeve (208), which is fitted over the outside of the first elastic member (204).

4. The anti-backfire nozzle according to claim 1, characterized in that, The piston assembly (2) further includes at least one rotating rod (209) and a helical blade (210). At least one of the rotating rods (209) passes through the isolation disc (201) and rotates as the isolation disc (201) slides. The portion of the rotating rod (209) located in the second chamber (112) is connected to the helical blade (210), which is used to drive the mixed fuel to flow toward the isolation disc (201).

5. The anti-backfire nozzle according to claim 4, characterized in that, The rotating rod (209) has a spiral groove (2091) on the portion of the first chamber (111). The isolation disc (201) has a rotating through hole corresponding to the rotating rod (209). The piston assembly (2) also includes a drive rod (211). One end of the drive rod (211) is fixed to the inner wall of the rotating through hole, and the other end of the drive rod (211) is slidably disposed in the spiral groove (2091).

6. The anti-backfire nozzle according to claim 5, characterized in that, The piston assembly (2) further includes a first sealing plate (212), a force-bearing plate (213), and a second elastic element (214). The first sealing plate (212) is slidably disposed at the inlet of the Tesla valve passage (12). The first sealing plate (212) has an open position and a closed position. When the first sealing plate (212) is in the open position, the Tesla valve passage (12) communicates with the medium chamber (11). When the first sealing plate (212) is in the closed position, the Tesla valve passage (12) is disconnected from the medium chamber (11). The force-bearing plate (213) is connected to... The first sealing plate (212) faces the rotating rod (209) and the rotating rod (209) is provided with a striking protrusion (2092) that abuts against the force plate (213). The rotating rod (209) is used to drive the first sealing plate (212) to slide from the closed position to the open position. The second elastic member (214) is sandwiched between the first sealing plate (212) and the inner wall of the medium chamber (11). The second elastic member (214) is configured to make the first sealing plate (212) have a tendency to slide from the open position to the closed position.

7. The anti-backfire nozzle according to claim 1, characterized in that, The piston assembly (2) further includes a second sealing plate (215) and a third elastic element (216). The isolation disc (201) has a medium flow channel connecting the first chamber (111) and the second chamber (112). The inlet of the medium flow channel is located in the first chamber (111), and the outlet of the medium flow channel is located in the second chamber (112). The second sealing plate (215) is slidably disposed in the medium flow channel and is used to close the inlet of the medium flow channel. The third elastic element (216) is disposed in the isolation disc (201) and is configured to make the second sealing plate (215) have a tendency to move away from the inlet of the medium flow channel.

8. The anti-backfire nozzle according to claim 1, characterized in that, The piston assembly (2) further includes a seal that is sandwiched between the piston plate (202) and the inner wall of the piston slide.

9. A hydrogen-fired gas turbine, characterized in that, The hydrogen-fired gas turbine includes a backfire prevention nozzle as described in any one of claims 1-8.

Images