WO2018218527A1 - Ignition nozzle device capable of improving ignition stability - Google Patents

Abstract

An ignition nozzle device (10) capable of improving the ignition stability. The ignition nozzle device (10) comprises a nozzle wall cylinder (12) and a nozzle tube (14). A combustion chamber (22) is formed in the nozzle wall cylinder (12). The nozzle wall cylinder (12) comprises a front end (18) and a rear end (20) opposite to each other in an axial direction. The nozzle tube (14) is mounted on the front end (18) of the nozzle wall cylinder and is in communication with the combustion chamber (22). The nozzle tube (14) is used for igniting a device to be ignited. The nozzle wall cylinder (12) is provided with a gas nozzle (32) for injecting a fuel gas into the combustion chamber (22). The mounting position of the gas nozzle (32) is near the rear end (20), and the injection direction of the gas nozzle (32) deviates from the nozzle wall (12) in the diameter direction of the mounting position, so that a gas injected by the gas nozzle (32) forms a spiral gas field in the combustion chamber (22). The ignition nozzle device (10) has a simple structure, is convenient to mount, has high practicability and is suitable for popularization and application.

Description

 Title of Invention: Ignition Nozzle Device for Improving Ignition Stability

 [0001] The present invention relates to an ignition nozzle, and more particularly to an ignition nozzle device that can improve ignition stability.

 Background technique

 [0002] Most of the current ignition nozzles first pass fuel into the combustion chamber, such as gas, to mix the gas with the air and then burn, thereby igniting the combustion chamber to be ignited, such as a gas turbine combustion chamber. In order to allow the gas to be sufficiently mixed with the air, the ignition device is provided with a long length in the longitudinal direction, and the mixing time is long. If the longitudinal length is reduced, the mixing uniformity may be affected, so that the ignition is unstable, and even the ignition failure occurs.

 technical problem

 In view of the above, the present invention proposes an ignition nozzle device which is simple in structure and stable in ignition and can improve ignition stability.

 Problem solution

 Technical solution

 The present invention provides an ignition nozzle device capable of improving ignition stability, comprising a nozzle wall cylinder and a nozzle tube, wherein the nozzle wall cylinder forms a combustion chamber, and the nozzle wall cylinder includes an axially opposite front end and a nozzle tube mounted at a front end of the nozzle wall tube and communicating with the combustion chamber, the nozzle tube for igniting a device to be ignited, the nozzle wall tube being provided with a fuel for injecting fuel into the combustion chamber a gas gas nozzle, the gas nozzle is mounted near the rear end, and the injection direction of the gas nozzle is offset from the diameter direction of the nozzle wall cylinder at the installation position, so that the gas injected by the gas nozzle is A rotating gas flow field is formed within the combustion chamber.

 In one embodiment, the gas nozzle includes an intake pipe, and the intake pipe is a straight pipe, and the intake pipe penetrates a wall surface of the nozzle wall cylinder and communicates with the combustion chamber.

 In an embodiment, an end of the intake pipe is adjacent to an inner wall surface of the combustion chamber.

[0007] In an embodiment, the nozzle wall tube includes a radially inner nozzle wall and a nozzle outer wall, the combustion chamber is formed in the inner wall of the nozzle, and the inner wall of the nozzle and the outer wall of the nozzle are formed and externally a communicating air flow passage, the nozzle inner wall is provided with a plurality of holes, so that the air flow passage passes through the plurality of holes It is in communication with the combustion chamber.

 [0008] In an embodiment, the inner wall of the nozzle is provided with an end plate on a side of the front end of the nozzle wall tube, the nozzle tube is disposed on the end plate, and the nozzle tube includes an intake end and An ignition end, the intake end is in communication with the combustion chamber, and the ignition end is in communication with the device to be ignited.

 In one embodiment, the device to be ignited is a gas turbine, and the gas turbine includes a gas turbine combustion chamber, and an ignition end of the nozzle tube extends into the combustion chamber of the gas turbine to ignite it.

 [0010] In an embodiment, a rear end of the nozzle wall cylinder is provided with a sealing cover, the sealing cover includes a cover body, and the cover body abuts against an end of the outer wall of the nozzle and the inner wall of the nozzle, The cover body vertically extends from the outer edge thereof toward the front end of the nozzle wall tube, and the connecting portion is fixedly connected to the outer wall of the nozzle

[0011] In an embodiment, the connecting portion is screwed and connected to the outer wall of the nozzle.

 [0012] In an embodiment, the plurality of holes are evenly distributed along a circumferential direction of the inner wall of the nozzle, and the plurality of holes include a plurality of holes arranged in the axial direction.

 Advantageous effects of the invention

 Beneficial effect

 In summary, the present invention provides an ignition nozzle device that can improve ignition stability, and includes a gas nozzle for injecting fuel gas into a combustion chamber. By placing the gas nozzle close to the rear end and its injection direction being offset from the diametrical direction, the gas injected by the gas nozzle forms a rotating gas flow field within the combustion chamber. Such tangential entry of fuel gas can promote the mixing of gas and air, shorten the mixing process, increase the uniformity of mixing, and make the ignition more stable and greatly improve the ignition success rate. Moreover, the axial dimension of the ignition device of the present invention can be significantly reduced in the case of achieving the same mixing uniformity and inter-turn ratio as compared to existing ignition nozzles. The ignition nozzle device of the invention has the advantages of simple structure, ingenious design, convenient installation and strong practicability, and is suitable for popularization and application.

 Brief description of the drawing

 DRAWINGS

 1 is an axial cross-sectional view of an ignition nozzle device of the present invention.

2 is a radial cross-sectional view of the ignition nozzle device of the present invention. Embodiments of the invention

 [0016] Before the embodiments are described in detail, it is understood that the invention is not limited to The invention may be embodied in other ways. Further, it should be understood that the phraseology and terminology used herein are for the purpose of description The words "including", "comprising", "having", and the like, are used in this context to include the items listed thereafter, their equivalents, and other additional items. In particular, when describing "a certain component", the present invention does not limit the number of the components to one, and may include a plurality.

 As shown in FIGS. 1 and 2, the present invention provides an ignition nozzle device 10 which can improve ignition stability, and the ignition nozzle device 10 includes a nozzle wall cylinder 12, a nozzle tube 14, and a sealing cover 16. The nozzle wall cylinder 12 has opposite front ends 18 and rear ends 20 in the axial direction, and a combustion chamber 22 is formed in the nozzle wall cylinder 12, and the nozzle tubes 14 are mounted at the front end 18 of the nozzle wall cylinder 12 and communicate with the combustion chamber 22 for A device to be ignited, for example, a gas turbine, an aeroengine, a boiler, a natural gas venting torch, etc., in this embodiment, a gas turbine is taken as an example. A sealing cover 16 is mounted to the rear end 20 of the nozzle wall cylinder 12 to seal the rear end 20 of the nozzle wall cylinder 12.

 [0018] In the illustrated embodiment, the nozzle wall cylinder 12 includes a radially inner nozzle wall 24 and a nozzle outer wall 26

The cavity in the inner wall 24 of the nozzle forms a combustion chamber 22, and an air flow path 28 communicating with the outside of the ignition nozzle device 10 is formed between the nozzle inner wall 24 and the nozzle outer wall 26.

[0019] The nozzle inner wall 24 is provided with a plurality of holes 30 through which the air flow passages 28 communicate with the combustion chamber 22. In the present embodiment, the plurality of holes 30 are evenly distributed along the circumferential direction of the nozzle inner wall 24, and are arranged in the axial direction in a plurality of turns, for example, three turns.

 [0020] The air flow passage 28 includes a front end and a rear end, and a front end of the air flow path 28 is for the outside air to enter the air flow path 28, and the rear end of the air flow path 28 is closed so that the air entering the air flow path 28 passes through A plurality of holes 30 enter the combustion chamber 22 to be mixed with the gas.

[0021] A gas nozzle 32 for injecting fuel gas into the combustion chamber 22 is disposed at a position near the rear end 20 of the nozzle wall cylinder 12, and the injection direction of the gas nozzle 32 is offset from the diameter direction of the nozzle wall cylinder 12, so that the gas nozzle 32 The injected gas impinges on the inner wall surface of the combustion chamber 22, thereby forming a rotating gas flow field along the circumferential direction of the combustion chamber 22, and the gas entering the combustion chamber as a whole moves axially toward the nozzle tube 14, promoting gas and air. Uniform mixing of gas.

 [0022] The gas nozzle 32 includes an intake pipe 33 which is a straight pipe, that is, the intake pipe 33 coincides with the injection direction of the gas nozzle 32. The intake pipe 33 is disposed through the nozzle outer wall 26 and the nozzle inner wall 24 and communicates with the combustion chamber 22. In the illustrated embodiment, the end of the intake pipe 33 is adjacent to the inner wall surface of the combustion chamber 22 so that the injected gas can be rotated along the inner wall of the combustion chamber. When the intake pipe 33 injects the gas enthalpy into the combustion chamber 22, the gas flow forms a rotating gas flow field around the axial direction of the nozzle wall cylinder 12 under the influence of the nozzle inner wall 24, and the air entering the air entering from the plurality of holes 30 is uniform. Mixing, shortening the mixing time between gas and air, and improving ignition efficiency.

 [0023] In the illustrated embodiment, the nozzle inner wall 24 is provided with an end plate 34 on one side of the front end 18 of the nozzle wall, the edge of the end plate 34 being sealingly connected to the inner wall 24 of the nozzle, and the central portion of the end plate 34 is provided for The nozzle tube 14 is bored through the through hole so that the combustion chamber 22 communicates with the inside of the nozzle tube 14. The nozzle tube 14 includes an intake end 36 and an ignition end 38, wherein the intake end 36 is located within the combustion chamber 22 and the ignition end 38 is coupled to the gas turbine. Specifically, the gas turbine includes a gas turbine combustor, and the firing end 38 of the nozzle tube 14 extends into the gas turbine combustor to ignite it.

 [0024] It should be understood that, in the above embodiment, the device to be ignited is implemented as a gas turbine for illustrative purposes only. In other embodiments, the device to be ignited may also be implemented as other devices, which is not limited by the present invention.

 [0025] The sealing cover 16 includes a cover 40 that abuts against the nozzle outer wall 26 and the nozzle inner wall 24 at the end of the nozzle wall barrel rear end 20 such that the combustion chamber 22 and the air flow passage 28 are behind the nozzle wall barrel One side of the end 20 is sealed. The cover 40 extends perpendicularly from the outer edge thereof toward the front end 18 of the nozzle wall to a connecting portion 42, and the connecting portion 42 is fixedly coupled to the outer wall 26 of the nozzle to fix the sealing cover 16 to the rear end 20 of the nozzle wall tube 12.

 The connecting portion 42 is fixedly coupled to the nozzle outer wall 26. In the illustrated embodiment, the connecting portion 42 is threadedly coupled to the outer wall 26 of the nozzle. Specifically, the inner side of the connecting portion 42 is provided with an interfitting thread on the outer wall surface corresponding to the outer wall 26 of the nozzle, so that the sealing cover 16 can be screwed to the outer wall 26 of the nozzle by rotation, facilitating the attachment and detachment of the ignition nozzle device 10.

 [0027] It should be noted that in other embodiments, the connecting portion 42 and the nozzle outer wall 26 may also be fixedly connected by other means, for example, a screw hole is provided at a corresponding position of the connecting portion 42 and the nozzle outer wall 26, and the screw is used. The two are fixedly connected.

In summary, the present invention provides an ignition nozzle device that can improve ignition stability, including a gas nozzle for injecting fuel gas into a combustion chamber. By setting the gas nozzle close to the rear end and its spray direction is biased From the diametrical direction, the gas injected from the gas nozzle forms a rotating gas flow field in the combustion chamber. The tangential entry of the fuel gas can promote the mixing of the gas and the air, shorten the mixing process, increase the uniformity of the mixing, and further make the ignition more stable and greatly improve the ignition success rate. Moreover, the axial size of the ignition device of the present invention can be significantly reduced in the case of achieving the same mixing uniformity and inter-turn ratio as compared with the prior art ignition nozzle. The ignition nozzle device of the invention has the advantages of simple structure, ingenious design, convenient installation and strong practicability, and is suitable for popularization and application.

 The concepts described herein may be embodied in other forms without departing from the spirit and scope. The specific embodiments disclosed are to be considered as illustrative and not restrictive. Therefore, the scope of the invention is to be determined by the appended claims rather Any changes which come within the meaning and range of the claims are intended to be within the scope of the claims.

Claims

Claim An ignition nozzle device capable of improving ignition stability, comprising a nozzle wall cylinder and a nozzle tube, wherein the nozzle wall cylinder forms a combustion chamber, and the nozzle wall cylinder includes axially opposite front and rear ends, the nozzle a tube is installed at a front end of the nozzle wall tube and communicates with the combustion chamber, and the nozzle tube is used for igniting a device to be ignited, wherein the nozzle wall tube is provided with a fuel gas for injecting fuel into the combustion chamber. a gas nozzle, the gas nozzle is installed at a position close to the rear end, and an injection direction of the gas nozzle is offset from a diameter direction of the nozzle wall cylinder at the installation position, so that the gas injected by the gas nozzle is in the A rotating gas flow field is formed within the combustion chamber. An ignition nozzle device for improving ignition stability according to claim 1, wherein The gas nozzle includes an intake pipe, and the intake pipe is a straight pipe, and the intake pipe penetrates a wall surface of the nozzle wall cylinder and communicates with the combustion chamber. The ignition nozzle device for improving ignition stability according to claim 2, wherein the end of the intake pipe is close to an inner wall surface of the combustion chamber. An ignition nozzle device capable of improving ignition stability according to claim 1, wherein said nozzle wall cylinder includes a radially inner nozzle wall and a nozzle outer wall, and said combustion chamber is formed in said nozzle inner wall. An air flow passage communicating with the outside is formed between the inner wall of the nozzle and the outer wall of the nozzle, and the inner wall of the nozzle is provided with a plurality of holes such that the air flow passage communicates with the combustion chamber through the plurality of holes. The ignition nozzle device for improving ignition stability according to claim 4, wherein the nozzle inner wall is provided with an end plate on a side of the front end of the nozzle wall cylinder, and the nozzle tube is disposed at the end The nozzle tube includes an intake end and an ignition end, and the intake end is in communication with the combustion chamber, and the ignition end is in communication with the device to be ignited. The ignition nozzle device for improving ignition stability according to claim 5, wherein said device to be ignited is a gas turbine, said gas turbine includes a gas turbine combustion chamber, and an ignition end of said nozzle tube extends into said gas turbine for combustion The room is ignited for it. The ignition nozzle device for improving ignition stability according to claim 4, wherein a sealing cover is provided at a rear end of the nozzle wall cylinder, and the sealing cover comprises a cover body, the cover The body abuts against the end of the outer wall of the nozzle and the inner wall of the nozzle, and the cover body vertically extends from the outer edge thereof toward the front end of the nozzle wall tube, and the connecting portion is fixedly connected to the outer wall of the nozzle. .  [Attachment 8] The ignition nozzle device for improving ignition stability according to claim 7, wherein The connecting portion is screwed and connected to the outer wall of the nozzle.  [Claim 9] The ignition nozzle device for improving ignition stability according to claim 4, wherein The plurality of holes are evenly distributed along the circumferential direction of the inner wall of the nozzle, and the plurality of holes include a plurality of holes arranged in the axial direction.