Telescopic ignition electric nozzle with function of blowing away deposited carbon

Abstract

The invention relates to the technical field of ignition electric nozzles, in particular to a telescopic ignition electric nozzle with a deposited carbon blow-off function, which comprises an air cylinder assembly, the air cylinder assembly comprises an air cylinder shell, an end cover and a mounting flange, the end cover is provided with an end cover via hole for an ignition rod to penetrate through, and the mounting flange is provided with a mounting flange via hole coaxially formed with the end cover via hole; the ignition rod can stretch out and complete ignition action under the action of elastic force of the spring and automatically retreat under the action of pressure difference inside and outside the combustion chamber, meanwhile, deposited carbon at the ignition end of the ignition rod is removed through air in an annular cavity, ignition reliability is improved, and the service life is prolonged. The ignition rod has the beneficial effects that the blow-off hole is formed in the ignition rod, air in the annular cavity can be sprayed into the blow-off channel through the blow-off hole no matter in the ignition starting stage or the normal working stage of the gas turbine, carbon deposition at the ignition end is blown off, the ignition energy of the ignition electric nozzle is improved, and the service life of the ignition electric nozzle is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of ignition nozzles, in particular to a retractable ignition nozzle with a carbon deposit blowing function. Background Art

[0002] Heavy-duty gas turbine power generation technology plays an important role in grid peak regulation and the "dual carbon" strategy due to its advantages such as fast start-up speed, strong fuel adaptability, high combustion efficiency, low pollutant emissions, compact structure, and easy peak regulation.

[0003] As one of the core components of a gas turbine, the combustion chamber is mainly used to convert the chemical energy of the fuel into the thermal energy and potential energy of the gas, and then the gas drives the turbine to expand and do work. Combustion chamber ignition is one of the key steps in the gas turbine startup process and a prerequisite for the normal operation of the entire unit. If the startup fails, it will take more than ten minutes of purge to enter the ignition program again, which will directly delay the normal startup and grid connection time of the unit, resulting in a significant increase in the power consumption and operation and maintenance costs of the gas turbine power plant, and a decrease in economic efficiency. Therefore, the stability and reliability of the ignition device are crucial to the startup of the gas turbine.

[0004] In heavy-duty gas turbines, in order to avoid the impact of high temperature and high pressure environment in the combustion chamber on the life of the ignition nozzle, retractable high-energy ignition nozzles are often used.

[0005] There have been many studies on retractable ignition nozzles at home and abroad, and the main driving methods are as follows: the first is to push the ignition rod out by the driving force of compressed air during ignition, and after successful ignition, the ignition rod is retracted under the consistent action of the spring force and the pressure difference inside and outside the combustion chamber; the second is to push the ignition rod out by the spring force during ignition, and after successful ignition, the ignition rod is retracted under the action of compressed air; the third is that the extension and retraction of the ignition rod are both driven by compressed air, so it is necessary to install special instrument air supply equipment, which also correspondingly increases the complexity and failure rate of the entire system.

[0006] In addition, because the ignition end of the ignition rod is on the gas side for a long time, the main combustion zone is in a rich combustion state during the ignition and speed increase process, which easily produces carbon deposits and adheres to the positive and negative electrodes of the ignition end of the ignition rod, resulting in reduced ignition energy or cessation of ignition, and an increase in the starting failure rate of the gas engine. Therefore, it is necessary to add a carbon deposit blowing device to the ignition nozzle to increase the service life of the ignition nozzle. Summary of the invention

[0007] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0008] The purpose of the present invention is to provide a retractable ignition nozzle with a carbon deposit blowing function.

[0009] Therefore, the purpose is to solve the problem that a carbon deposit blowing device needs to be added to the ignition nozzle.

[0010] In order to solve the above technical problems, the present invention provides the following technical solutions: a retractable ignition nozzle with a carbon deposit blowing function, comprising a cylinder assembly, comprising a cylinder housing, an end cover and a mounting flange, the end cover is provided with an end cover through hole for the ignition rod to pass through, and the mounting flange is provided with a mounting flange through hole coaxially with the end cover through hole; a large piston capable of sliding in the cylinder housing, the large piston dividing the internal space of the cylinder housing into an upper chamber and a lower chamber; a spring, one end of the spring abutting the end cover and the other end abutting the large piston for providing a reset force; an ignition rod passing through the end cover through hole and the mounting flange through hole and being designed as an integrated whole with the large piston, the ignition rod being provided with at least one blowing hole, the blowing hole connecting the annular cavity air channel and the ignition end of the ignition rod; wherein the ignition rod can be extended and complete the ignition action under the action of the spring elastic force, and automatically retract under the action of the pressure difference between the inside and outside of the combustion chamber, and the annular cavity air is used to remove the carbon deposits at the ignition end of the ignition rod, thereby improving the ignition reliability and service life.

[0011] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, the blowing holes are evenly distributed along the center direction of the ignition rod, and the number of the blowing holes is 4 to 8 to ensure full coverage of the ignition end surface and improve the blowing efficiency.

[0012] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, the diameter of the blowing hole ranges from 1 to 3 mm, and the axis of the blowing hole forms an inclination angle of 30 to 60 degrees with the central axis of the ignition rod to optimize the gas flow path and enhance the effect of blowing away carbon deposits.

[0013] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, the radial clearance between the ignition rod and the through hole of the mounting flange is set to 1 to 2 mm, ensuring that the ignition rod can move smoothly during the reciprocating motion to avoid jamming.

[0014] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, a small piston is provided between the large piston and the end cover, and the small piston and the ignition rod are of integrated design. The extension and retraction stroke of the ignition rod can be controlled by adjusting the relative position of the small piston on the ignition rod.

[0015] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, a small piston trapezoidal sealing surface is provided on the end face of the small piston facing the end cover, and a matching end cover trapezoidal sealing surface is provided on the end face of the end cover facing the small piston. When the ignition rod is fully retracted, the small piston trapezoidal sealing surface is tightly fitted with the end cover trapezoidal sealing surface to form a sealing structure.

[0016] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, the angles of the trapezoidal sealing surface of the small piston and the trapezoidal sealing surface of the end cover are both 3 degrees to 8 degrees. When the ignition rod is fully retracted, an effective sealing fit can be achieved between the trapezoidal sealing surface of the small piston and the trapezoidal sealing surface of the end cover.

[0017] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, multiple stages of graphite sealing rings are sequentially installed on the outer wall of the large piston, intermediate rings are provided between the graphite sealing rings of each stage, and the graphite sealing rings are fixed to the large piston by sealing ring locking nuts to enhance the overall sealing performance.

[0018] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, a support rib is provided on the end surface of the large piston facing the mounting flange, and a gap is left between the support rib and the mounting flange to ensure that the air in the annular cavity can effectively act on the large piston and push the ignition rod to retract smoothly.

[0019] As a preferred solution of the retractable ignition nozzle with carbon deposit blowing function of the present invention, the spring preload force is slightly smaller than the pressure of the annular cavity air acting on one end of the large piston toward the mounting flange after ignition, ensuring that the ignition rod can be quickly retracted to the initial position after completing the ignition task.

[0020] The beneficial effects of the retractable ignition nozzle with carbon deposit blowing function of the present invention are as follows: a blowing hole is arranged on the ignition rod, and the annular cavity air can be sprayed into the blowing channel through the blowing hole in both the ignition start-up stage and the normal working stage of the gas turbine to blow away the carbon deposits at the ignition end, thereby improving the ignition energy and service life of the ignition nozzle;

[0021] A small piston trapezoidal sealing surface is provided on the end surface of the small piston close to the end cover, and an end cover trapezoidal sealing surface is provided on the end surface of the end cover close to the small piston. When the gas turbine is operating normally, the ignition rod is fully retracted, and the trapezoidal sealing surface of the small piston fits tightly with the trapezoidal sealing surface of the end cover, which can effectively prevent the air in the ring cavity from leaking to the outside of the ignition nozzle through the outer side of the graphite sealing ring and the gap between the ignition rod and the end cover;

[0022] During ignition, the ignition rod is pushed out by spring force. After successful ignition, the ignition rod automatically retracts due to the pressure difference inside and outside the combustion chamber. Compared with other telescopic methods, it does not require additional instrument air supply equipment, reducing the complexity, failure rate and operating cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0024] Figure 1 It is a schematic cross-sectional view of the structure of the retractable ignition nozzle with carbon deposit blowing function in the present invention when the ignition rod is extended.

[0025] Figure 2 It is a schematic cross-sectional view of the structure of the retractable ignition nozzle with carbon deposit blowing function in the present invention when the ignition rod is in a retracted state.

[0026] In the figure:

[0027] 100, cylinder assembly; 101, cylinder housing; 102, end cover; 103, mounting flange;

[0028] 102a, end cover through hole;

[0029] 103a, mounting flange through hole;

[0030] 200, large piston; 201, upper chamber; 202, lower chamber;

[0031] 300, spring;

[0032] 400, ignition rod; 401, blow-off hole;

[0033] 500, small piston; 501, trapezoidal sealing surface of small piston; 502, trapezoidal sealing surface of end cover; 503, graphite sealing ring; 504, intermediate ring; 505, sealing ring locking nut; 506, supporting rib. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0037] Example 1

[0038] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides a retractable ignition nozzle with a carbon deposit blowing function, including a cylinder assembly 100, which includes a cylinder housing 101, an end cover 102 and a mounting flange 103, the end cover 102 is provided with an end cover through hole 102a for the ignition rod 400 to pass through, and the mounting flange 103 is provided with a mounting flange through hole 103a coaxially with the end cover through hole 102a; a large piston 200, which can slide in the cylinder housing 101, and the large piston 200 divides the internal space of the cylinder housing 101 into an upper chamber 201 and a lower chamber 202; a spring 300, the spring 300 is provided with a One end abuts against the end cover 102, and the other end abuts against the large piston 200, which is used to provide a reset force; the ignition rod 400 passes through the end cover through hole 102a and the mounting flange through hole 103a and is designed as an integrated whole with the large piston 200, and at least one blow-off hole 401 is provided on the ignition rod 400, and the blow-off hole 401 connects the annular cavity air channel a with the ignition end of the ignition rod 400; wherein, the ignition rod 400 can extend and complete the ignition action under the elastic force of the spring 300, and automatically retract under the pressure difference between the inside and outside of the combustion chamber, and at the same time, the annular cavity air is used to remove the carbon deposits at the ignition end of the ignition rod 400, thereby improving the ignition reliability and service life.

[0039] In this embodiment, the cylinder housing 101 is hollow, and has an end cover 102 and a mounting flange 103 that seal the opposite ends of the cylinder housing 101. The end cover 102 and the mounting flange 103 are fastened together by bolts. In order to improve the sealing connection performance between the end face of the cylinder housing 101 and the end cover 102 and the mounting flange 103, an end cover 102 sealing groove is provided on the end cover 102 and the mounting flange 103, the top end of the cylinder housing 101 is sealedly connected to the end cover 102 sealing groove, and the bottom end of the cylinder housing 101 is sealedly connected to the mounting flange 103 sealing groove. An end cover through hole 102a is also provided on the end cover 102. A mounting flange through hole 103a is provided on the mounting flange 103. The ignition rod 400 can telescopically pass through the end cover through hole 102a and the mounting flange through hole 103a to enter the annular cavity air channel a and the high-temperature gas channel b.

[0040] In this embodiment, the ignition nozzle is mainly composed of a cylinder housing 101 , a large piston 200 , a spring 300 and an ignition rod 400 .

[0041] The ignition rod 400 has an extended state and a retracted state. Figure 1 As shown, the ignition end of the ignition rod 400 extends into the high-temperature gas channel b. In the retracted state, the ignition end of the ignition rod 400 is located outside the high-temperature gas channel b, but the ignition rod 400 passes through the annular cavity air channel a and continues to extend downward into the flame tube through hole r2. Figure 2 shown.

[0042] The ignition rod 400 includes an ignition positive electrode c1, an ignition rod shell c2 and an insulating ceramic tube c3. The ignition rod shell c2 acts as a negative electrode. The insulating ceramic tube c3 separates the ignition positive electrode c1 from the ignition rod shell c2 to prevent a short circuit between the ignition positive electrode c1 and the ignition rod shell c2. An ignition rod positive electrode contact c4 is designed at the upper end of the ignition positive electrode c1, and the ignition rod positive electrode contact c4 and the ignition rod shell c2 are connected to a high-voltage power supply through an ignition cable. An ignition cable fastening thread c5 is arranged at the upper end of the ignition rod shell c2 to ensure good contact between the ignition cable and the ignition rod 400 and improve the spark energy at the ignition end. The ignition positive electrode c1 and the ignition rod shell c2 are both made of high-temperature resistant alloy materials.

[0043] The insulating ceramic tube c3 in the ignition rod 400 does not extend to the ignition end, and the ignition positive electrode c1 and the ignition rod housing c2 form a blow-off channel w1 in the direction of the ignition end. The ignition rod 400 is provided with a plurality of blow-off holes 401, which connect the annular cavity air channel a and the blow-off channel w1 at the ignition end of the ignition rod 400. The plurality of blow-off holes 401 are arranged at intervals along the circumference of the ignition rod 400, and the air in the annular cavity air channel a is sprayed into the blow-off channel w1 through the blow-off holes 401 to blow off the carbon deposits at the ignition end, thereby improving the ignition energy and service life of the ignition nozzle.

[0044] Example 2

[0045] Reference Figure 1-2 , which is the second embodiment of the present invention. Different from the previous embodiment, the blow-off holes 401 are evenly distributed along the center direction of the ignition rod 400, and the number of the blow-off holes 401 is 4 to 8, so as to ensure that the ignition end surface is covered in all directions and improve the blow-off efficiency. The diameter of the blow-off holes 401 ranges from 1 to 3 mm, and the axis of the blow-off holes 401 forms an inclination angle of 30 to 60 degrees with the central axis of the ignition rod 400 to optimize the gas flow path and enhance the effect of blowing off carbon deposits. The radial clearance between the ignition rod 400 and the mounting flange through hole 103a is set to 1 to 2 mm to ensure that the ignition rod 400 can move smoothly during the reciprocating motion to avoid jamming.

[0046] In this embodiment, the diameter of the blow-off hole 401 is 2 mm, the side of the blow-off hole 401 close to the blow-off channel w1 is inclined toward the ignition end, and the angle between the blow-off hole 401 and the central axis of the ignition rod 400 is 45°, and the number of the blow-off holes 401 is 4.

[0047] For example, from the perspective of coverage, since the blow-off holes 401 are evenly distributed along the center of the ignition rod 400, the blow-off gas can form a uniform airflow field on the surface of the ignition end. This uniformity helps to eliminate dead angles, thereby improving the blow-off efficiency. It can ensure that the blow-off force provided by each blow-off hole 401 can effectively act on the carbon deposits, while avoiding energy waste due to too many holes or incomplete blow-off due to too few holes.

[0048] Secondly, the diameter of the blow-off hole 401 is limited to 1 to 3 mm, mainly in consideration of the flow rate and pressure of the blow-off gas. Too small a hole diameter will result in insufficient gas flow and poor blow-off effect, while too large a hole diameter may cause excessive gas flow, resulting in unnecessary energy consumption and possible adverse effects on the equipment.

[0049] The axis of the blow-off hole 401 forms an inclination angle of 30 to 60 degrees with the central axis of the ignition rod 400, which is to optimize the gas flow path. With such a design, the gas will be ejected at a certain angle after entering the blow-off hole 401, which can not only effectively remove carbon deposits, but also reduce the possibility of gas directly impacting the ignition rod 400 to a certain extent, thereby extending the service life of the device. In addition, the inclined design also helps to improve the coverage of the airflow, so that carbon deposits can be blown away no matter where they are.

[0050] The radial clearance between the ignition rod 400 and the mounting flange through hole 103a is set to 1 to 2 mm to ensure the smoothness of the ignition rod 400 during the reciprocating motion. If the clearance is too small, the ignition rod 400 may get stuck during the motion, affecting the working efficiency of the equipment; if the clearance is too large, the ignition rod 400 may move unstably, thus affecting the accuracy and stability of its operation. Therefore, a reasonable clearance setting not only ensures the normal operation of the ignition rod 400, but also ensures the reliability of the overall operation of the equipment.

[0051] Example 3

[0052] Reference Figure 1-2 , which is the third embodiment of the present invention, and this embodiment further provides a retractable ignition nozzle with a carbon deposit blowing function. A small piston 500 is provided between the large piston 200 and the end cover 102. The small piston 500 and the ignition rod 400 are of an integrated design. The extension and retraction stroke of the ignition rod 400 are controlled by adjusting the relative position of the small piston 500 on the ignition rod 400. A small piston trapezoidal sealing surface 501 is provided on the end surface of the small piston 500 facing the end cover 102, and a matching end cover trapezoidal sealing surface 502 is provided on the end surface of the end cover 102 facing the small piston 500. When the ignition rod 400 is fully retracted, the small piston trapezoidal sealing surface 501 and the end cover trapezoidal sealing surface 502 are tightly fitted to form a sealing structure. The angles of the small piston trapezoidal sealing surface 501 and the end cover trapezoidal sealing surface 502 are both 3 to 8 degrees. When the ignition rod 400 is fully retracted, an effective seal can be achieved between the small piston trapezoidal sealing surface 501 and the end cover trapezoidal sealing surface 502. Multiple stages of graphite sealing rings 503 are sequentially installed on the outer wall of the large piston 200, and intermediate rings 504 are arranged between each stage of the graphite sealing rings 503. The graphite sealing rings 503 are fixed to the large piston 200 through sealing ring locking nuts 505 to enhance the overall sealing performance.

[0053] In this embodiment, the large piston 200 is located in the cylinder housing 101 and is designed as an integrated unit with the ignition rod 400. Multiple levels of graphite sealing rings 503 are sequentially installed on the outer wall of the large piston 200, and two adjacent levels of graphite sealing rings 503 are separated by an intermediate ring 504, and the graphite sealing rings 503 are fixed by a sealing ring locking nut 505. The graphite sealing ring 503 is slidably matched with the inner wall of the cylinder housing 101, which not only ensures that the ignition rod 400 can be freely extended and retracted, but also avoids air leakage between the large piston 200 and the cylinder housing 101 and prevents pressure difference from being generated, thereby ensuring that the ignition rod 400 can be quickly and reliably withdrawn from the high-temperature gas channel b. In this embodiment, 4 levels of graphite sealing rings 503 are installed on the outer wall of the large piston 200. As a high-quality sealing material, graphite has good heat resistance and wear resistance. This means that even under extreme conditions such as high temperature and high pressure, the graphite sealing ring 503 can still maintain its shape and sealing performance, thereby ensuring the normal operation of the device in extreme environments. This is especially true for the ignition rod 400 which needs to be frequently extended and retracted.

[0054] Secondly, by using the interval arrangement of the multi-stage graphite sealing ring 503 and the intermediate ring 504, the wear can be effectively dispersed and the service life of each graphite sealing ring 503 can be extended. The pressure and degree of wear borne by each stage of the graphite sealing ring 503 are different. This design makes the outermost graphite sealing ring 503 bear the wear first, while the inner graphite sealing ring 503 is relatively less damaged. When the outermost graphite sealing ring 503 is worn, the sealing effect can be reset by replacing or adjusting the sealing ring locking nut 505, without having to replace the large piston 200 assembly as a whole, which greatly reduces the maintenance cost.

[0055] A small piston 500 is provided between the large piston 200 and the end cover 102. The small piston 500 and the ignition rod 400 are designed in an integrated manner. The extension and retraction distance of the ignition rod 400 are adjusted by determining the relative positions of the small piston 500 and the large piston 200 on the ignition rod 400. A small piston trapezoidal sealing surface 501 is provided on the end surface of the small piston 500 close to the end cover 102, and an end cover trapezoidal sealing surface 502 is provided on the end surface of the end cover 102 close to the small piston 500. The angle of the small piston trapezoidal sealing surface 501 and the end cover trapezoidal sealing surface 502 are exactly the same. In this embodiment, the angle of the trapezoidal sealing surface is 5°, which is conducive to the disengagement of the small piston 500 and the end cover 102 when the ignition rod 400 is extended. When the ignition rod 400 is in a fully retracted state, the small piston trapezoidal sealing surface 501 and the end cover trapezoidal sealing surface 502 are tightly fitted, which can better block the leakage of the annular cavity air and prevent the gas turbine output power from decreasing.

[0056] A support rib 506 is provided on the end surface of the large piston 200 facing the mounting flange 103, and a gap is left between the support rib 506 and the mounting flange 103 to ensure that the annular cavity air can effectively act on the large piston 200 and push the ignition rod 400 to retract smoothly. The preload force of the spring 300 is slightly smaller than the pressure of the annular cavity air acting on the end of the large piston 200 facing the mounting flange 103 after ignition, ensuring that the ignition rod 400 can quickly retract to the initial position after completing the ignition task.

[0057] In addition, a plurality of supporting ribs 506 are provided on the end surface of the large piston 200 close to the mounting flange 103 to separate the large piston 200 from the mounting flange 103, thereby ensuring that after successful ignition, the force exerted by the annular cavity air on the large piston 200 is sufficient to push the ignition rod 400 back.

[0058] The spring 300 is a compression spring 300, which is used to push the large piston 200 toward the mounting flange 103, so as to drive the ignition rod 400 fixedly connected to the large piston 200 to return from the retracted state to the extended state to prepare for ignition. One end of the spring 300 is connected to the upper end surface of the large piston 200, and the other end is connected to the lower end surface of the end cover 102. When the ignition rod 400 is in the extended state, the spring 300 supports the large piston 200 downward to balance the force of the annular cavity air acting on the lower end surface of the large piston 200.

[0059] Design criteria of spring 300: The elastic force of spring 300 is slightly smaller than the pressure of annular cavity air acting on the lower end surface of large piston 200 after successful ignition, but larger than the pressure of annular cavity air acting on the lower end surface of large piston 200 during engine purge.

[0060] In summary, when the gas turbine is not started, the air pressure in the lower chamber 202 of the cylinder housing 101 is maintained at a normal pressure level. At this time, the large piston 200 pushed by the spring 300 will move toward the mounting flange 103, and the ignition rod 400 connected thereto is in an extended position, with its ignition end aligned with the high-temperature gas channel b to prepare for the ignition operation.

[0061] During ignition, the high voltage power supply applies a high voltage of nearly 10,000 volts to the ignition rod 400, causing the air between the positive electrode of the ignition end of the ignition rod 400 and the ignition rod housing c2 as the negative electrode to be ionized, forming a spark. This spark will ignite the combustible mixed gas in the high-temperature gas channel b.

[0062] Once the ignition is successful, the air pressure in the annular cavity air channel a increases rapidly, causing the annular cavity air to flow into the lower chamber 202 of the cylinder housing 101 through the engine cylinder body through hole e1 and the gap between the mounting flange through hole 103a and the ignition rod 400. At this time, the air pressure acting on the lower surface of the large piston 200 exceeds the resistance of the spring 300, pushing the large piston 200 to move toward the end cover 102, thereby gradually separating the ignition end of the ignition rod 400 from the high-temperature gas channel b, thereby protecting the ignition rod 400 from high-temperature erosion and extending its service life. During the retreat of the ignition rod 400, the air in the upper chamber 201 of the cylinder housing 101 is discharged through the gap between the end cover through hole 102a and the ignition rod 400. When the ignition rod 400 is fully retracted, the small piston trapezoidal sealing surface 501 will be in close contact with the end cover trapezoidal sealing surface 502, preventing the annular cavity air from bypassing the graphite sealing ring 503 and the gap between the ignition rod 400 and the end cover 102 to leak to the outside of the ignition nozzle, ensuring that the efficiency of the gas turbine is not affected. At the same time, as the piston moves toward the end cover 102, the spring 300 will be compressed.

[0063] During ignition startup and normal operation of the gas turbine, there is a pressure difference of about 5% between the inside and outside of the flame tube r1, so that the pressure of the annular air channel a is slightly higher than that of the high-temperature gas channel b. In this way, part of the annular air can enter the blow-off channel w1 through a plurality of blow-off holes 401 evenly distributed along the center of the circle. These blow-off holes 401 are designed to be close to the ignition end and tilted in that direction, so that the blow-off air can be evenly ejected from the ignition end of the ignition nozzle. This can not only prevent high-temperature gas from entering the blow-off channel w1 and reduce the risk of ignition end being ablated, but also help remove carbon deposits at the ignition end, preventing problems such as reduced ignition energy and ignition failure caused by carbon accumulation.

[0064] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0065] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0066] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0067] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A retractable ignition nozzle with carbon deposit blowing function, characterized in that: include, A cylinder assembly (100) comprises a cylinder housing (101), an end cover (102) and a mounting flange (103); the end cover (102) is provided with an end cover through hole (102a) for the ignition rod (400) to pass through; the mounting flange (103) is provided with a mounting flange through hole (103a) coaxially with the end cover through hole (102a); A large piston (200) is capable of sliding in the cylinder housing (101), and the large piston (200) divides the internal space of the cylinder housing (101) into an upper chamber (201) and a lower chamber (202); a spring (300), one end of the spring (300) abutting against the end cover (102), and the other end abutting against the large piston (200), for providing a reset force; An ignition rod (400) passes through the end cover through hole (102a) and the mounting flange through hole (103a) and is designed to be integrated with the large piston (200). The ignition rod (400) is provided with at least one blow-off hole (401), and the blow-off hole (401) communicates with the annular cavity air channel (a) and the ignition end of the ignition rod (400); The ignition rod (400) can extend under the elastic force of the spring (300) and complete the ignition action, and automatically retract under the pressure difference inside and outside the combustion chamber, while the carbon deposits on the ignition end of the ignition rod (400) are removed by the annular cavity air.

2. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 1, characterized in that: The blow-off holes (401) are evenly distributed along the center direction of the ignition rod (400), and the number of the blow-off holes (401) is 4 to 8.

3. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 2, characterized in that: The diameter of the blow-off hole (401) ranges from 1 to 3 mm, and the axis of the blow-off hole (401) forms an inclination angle of 30 to 60 degrees with the central axis of the ignition rod (400).

4. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 3, characterized in that: The radial clearance between the ignition rod (400) and the mounting flange through hole (103a) is set to 1 to 2 mm.

5. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 4, characterized in that: A small piston (500) is provided between the large piston (200) and the end cover (102); the small piston (500) and the ignition rod (400) are of an integrated design; and the extension and retraction stroke of the ignition rod (400) can be controlled by adjusting the relative position of the small piston (500) on the ignition rod (400).

6. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 5, characterized in that: A small piston trapezoidal sealing surface (501) is provided on the end surface of the small piston (500) facing the end cover (102), and an end cover trapezoidal sealing surface (502) matching the small piston (500) is provided on the end surface of the end cover (102) facing the small piston (500). When the ignition rod (400) is fully retracted, the small piston trapezoidal sealing surface (501) and the end cover trapezoidal sealing surface (502) are tightly fitted to form a sealing structure.

7. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 6, characterized in that: The angles of the small piston trapezoidal sealing surface (501) and the end cover trapezoidal sealing surface (502) are both 3 to 8 degrees, and when the ignition rod (400) is fully retracted, effective sealing cooperation can be achieved between the small piston trapezoidal sealing surface (501) and the end cover trapezoidal sealing surface (502).

8. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 7, characterized in that: Multiple levels of graphite sealing rings (503) are sequentially mounted on the outer wall of the large piston (200), intermediate rings (504) are arranged between each level of the graphite sealing rings (503), and the graphite sealing rings (503) are fixed to the large piston (200) via sealing ring locking nuts (505).

9. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 1, characterized in that: A support rib (506) is provided on the end surface of one side of the large piston (200) facing the mounting flange (103), and a gap is left between the support rib (506) and the mounting flange (103) to ensure that the air in the annular cavity can effectively act on the large piston (200) to push the ignition rod (400) to retract smoothly.

10. The retractable ignition nozzle with carbon deposit blowing function as claimed in claim 9, characterized in that: The preload force of the spring (300) is slightly smaller than the pressure of the air in the annular cavity acting on one end of the large piston (200) toward the mounting flange (103) after ignition, thereby ensuring that the ignition rod (400) can be quickly retracted to the initial position after completing the ignition task.

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