Burner lance, burner, bitumen mixing plant and lance self-cleaning method

Abstract

The present application belongs to the technical field of burners, and particularly relates to a burner lance, a burner, an asphalt mixing station, a lance self-cleaning method and electronic equipment. The burner lance comprises a lance body, a first pipe body and a second pipe body; an end face of one end of the first pipe body is provided with a nozzle for spraying an oil-gas mixture; a gas injection port is arranged at a position opposite to the nozzle on the second pipe body, the gas injection port is used for spraying fuel gas and burning the coke at the nozzle through combustion of the fuel gas, or the gas injection port is used for spraying compressed air and blowing the nozzle to ignite an igniter connected to the lance body to ignite the oil-gas mixture or the fuel gas. Through the technical scheme of the present application, the burner lance can realize self-cleaning by burning or blowing the coke at the nozzle, without manual cleaning operation, which is convenient and efficient and has higher cleaning efficiency; meanwhile, the overall structure is optimized, and operation is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of burner technology, specifically relating to burner spray guns, burners, asphalt mixing plants, self-cleaning methods for spray guns, and electronic equipment. Background Technology

[0002] Currently, some burners used in asphalt mixing plants employ fuel oil. However, due to insufficient mixing and other factors, fuel oil is prone to coking during combustion, especially when heavy oil is used. The resulting coking deposits accumulate at the nozzles, easily causing blockages and affecting normal fuel injection and combustion. To address this, some existing burners have improved the internal structure of the spray gun to reduce coking at the nozzles to some extent. However, these solutions cannot completely eliminate coking. Over long-term use, coking deposits still accumulate at the nozzles, requiring manual cleaning, which is time-consuming, labor-intensive, and reduces work efficiency. Summary of the Invention

[0003] In view of this, in order to improve at least one of the above-mentioned problems existing in the prior art, the present invention provides a burner spray gun, a burner, an asphalt mixing plant, and a self-cleaning method for the spray gun.

[0004] A first aspect of the present invention provides a burner spray gun, comprising: a spray gun body, the spray gun body including a first tube and a second tube; a nozzle for spraying an oil-gas mixture is provided on the end face of one end of the first tube; an air jet is provided on the second tube opposite to the nozzle, the air jet being used to spray gas and clean the coking material at the nozzle by combustion of the gas, or the air jet being used to spray compressed air and clean the nozzle by blowing air; and an igniter connected to the spray gun body, the igniter being correspondingly provided with the nozzle and the air jet for igniting the oil-gas mixture or gas.

[0005] In one feasible implementation, the second tube is sleeved on the outside of the first tube, and a first annular airflow channel is formed between the inner wall of the second tube and the outer wall of the first tube.

[0006] In one feasible implementation, the igniter is provided with an ignition electrode at one end corresponding to the nozzle and the jet port; the outer edge of the jet port is provided with a flow guiding structure, which is inclined toward the radial inner side of the second tube body, and an ignition hole is provided at the position opposite to the ignition electrode of the flow guiding structure, which can ignite the gas ejected from the jet port when the gas ejected from the ignition hole is ignited.

[0007] In one feasible implementation, the end face where the nozzle is located is a conical surface, the nozzle includes multiple spray holes, and the multiple spray holes are spaced apart along the circumferential direction of the conical surface; wherein, the flow guiding structure is a conical tube structure adapted to the conical surface.

[0008] In one feasible implementation, an air inlet connector is provided on the side wall of the second pipe body, and the air inlet connector is connected to the gas pipeline and the second air pipeline; a connecting support is also provided on the side wall of the second pipe body, and the igniter is detachably connected to the connecting support.

[0009] In one feasible implementation, the first pipe body includes an oil-gas mixing chamber, a fuel supply pipe, an air supply pipe, and an oil-gas mixing structure. One end of the oil-gas mixing chamber is connected to a nozzle. The fuel supply pipe is adapted to connect to a fuel line, and the air supply pipe is adapted to connect to a first air line. The oil-gas mixing structure is located at the end of the oil-gas mixing chamber away from the nozzle and is connected to the oil-gas mixing chamber, the fuel supply pipe, and the air supply pipe. The oil-gas mixing structure enables compressed air from the air supply pipe and fuel from the fuel supply pipe to be injected into the oil-gas mixing chamber, and at least a portion of the fuel and compressed air are mixed within the oil-gas mixing structure.

[0010] In one feasible implementation, the oil-gas mixing structure is provided with a first connecting channel, a second connecting channel and an inner connecting channel; the two ends of the first connecting channel are respectively connected to the oil-gas mixing chamber and the oil supply pipeline; the two ends of the second connecting channel are respectively connected to the oil-gas mixing chamber and the gas supply pipeline; wherein, the two ends of the inner connecting channel are respectively connected to the first connecting channel and the second connecting channel.

[0011] In one feasible implementation, the first connecting channel is arranged axially, and the two ends of the first connecting channel are respectively provided with a first oil inlet and a first oil outlet arranged axially; the second connecting channel is located radially outside the first connecting channel, and the connection between the second connecting channel and the gas supply pipeline is provided with a second air inlet extending radially, and the connection between the second connecting channel and the oil-gas mixing chamber is provided with a second air outlet extending axially; the inner connecting channel is located near the second air outlet, and the inner connecting channel is arranged radially.

[0012] In one feasible implementation, the first connecting channel includes a primary mixing pipe section located at the connection between the first connecting channel and the inner connecting channel, and the diameter of the primary mixing pipe section is larger than the diameter of other pipe sections in the first connecting channel; wherein, there are multiple inner connecting channels, and the multiple inner connecting channels are spaced apart circumferentially along the primary mixing pipe section.

[0013] In one feasible implementation, the gas supply pipeline and the oil supply pipeline are coaxially arranged, the oil supply pipeline is located inside the gas supply pipeline, and a second annular airflow channel is formed between the inner wall of the gas supply pipeline and the outer wall of the oil supply pipeline.

[0014] A second aspect of the present invention also provides a burner, comprising: a fuel supply device, a gas supply device, a compressed air supply device, and a high-voltage power supply device; and a burner nozzle as described in any of the preceding embodiments, wherein a first tube is connected to the fuel supply device and the compressed air supply device, a second tube is connected to the gas supply device and the compressed air supply device, an igniter is electrically connected to the high-voltage power supply device; and a controller is communicatively connected to the fuel supply device, the gas supply device, the compressed air supply device, and the high-voltage power supply device.

[0015] A third aspect of the present invention also provides an asphalt mixing plant, comprising: the burner described in any of the preceding claims.

[0016] The fourth aspect of the present invention also provides a self-cleaning method for a burner spray gun as described in any of the above claims. The self-cleaning method includes: injecting gas through the jet nozzle of the burner spray gun into the nozzle, igniting the gas ejected from the jet nozzle and burning the coking material, and continuing for a first duration; stopping the gas injection after the first duration, and injecting compressed air through the jet nozzle into the nozzle, and continuing for a second duration.

[0017] In one feasible implementation, gas is injected into the nozzle through the jet nozzle of the burner lance, igniting the gas ejected from the jet nozzle and burning the coking material, and this continues for a first duration, including:

[0018] Upon receiving the self-cleaning activation signal, gas is supplied to the second tube of the burner nozzle through the gas pipeline, and power is simultaneously supplied to the igniter of the burner nozzle; after the gas ejected from the nozzle is ignited, the power supply to the igniter is stopped; after the gas ejected from the nozzle has burned for a first duration, the gas pipeline is controlled to stop supplying gas to the second tube.

[0019] In one feasible implementation, the self-cleaning activation signal in the spray gun self-cleaning method is triggered by a manual control command; or the self-cleaning activation signal is triggered by the end signal of the internal fuel purging operation of the burner spray gun.

[0020] A fifth aspect of the present invention also provides an electronic device, comprising: a processor; a memory storing a computer program, wherein the processor executes the computer program to implement the spray gun self-cleaning method described in any of the preceding claims.

[0021] The beneficial effects of this invention are reflected in:

[0022] By improving and optimizing the burner nozzle, the burner nozzle can achieve self-cleaning by burning and blowing on the coke deposits at the nozzle, eliminating the need for manual cleaning, making it convenient, quick, and more efficient. At the same time, the integrated design of the nozzle body and igniter has been achieved, resulting in a more optimized overall structure and easier operation. Attached Figure Description

[0023] Figure 1 The image shown is a three-dimensional schematic diagram of a burner nozzle according to an embodiment of the present invention.

[0024] Figure 2 The image shown is a front view of a burner nozzle according to an embodiment of the present invention.

[0025] Figure 3 The image shown is a left view of a burner nozzle according to an embodiment of the present invention.

[0026] Figure 4 As shown Figure 3 Sectional view along direction AA.

[0027] Figure 5 As shown Figure 3 An enlarged view of part B in the image.

[0028] Figure 6 The image shown is a top view of a burner nozzle according to an embodiment of the present invention.

[0029] Figure 7 As shown Figure 4 An enlarged view of part C in the image.

[0030] Figure 8 As shown Figure 4 An enlarged view of part D in the image.

[0031] Figure 9 The figure shown is a schematic block diagram of a burner provided in one embodiment of the present invention.

[0032] Figure 10 The diagram shown is a schematic block diagram of an asphalt mixing plant according to an embodiment of the present invention.

[0033] Figure 11 The diagram shown is a flowchart of a spray gun self-cleaning method according to an embodiment of the present invention.

[0034] Figure 12 The diagram shown is a flowchart of a spray gun self-cleaning method according to an embodiment of the present invention.

[0035] Among them, Figure 4 and Figure 8 In the diagram, solid arrows indicate the direction of compressed air flow, while hollow arrows indicate the direction of fuel flow. Detailed Implementation

[0036] In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0037] Furthermore, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Application Overview

[0040] A burner is a device that mixes fuel and air in a specific way and then sprays it for combustion. Common burners are classified by fuel type, such as oil burners and gas burners. Currently, many burners used in asphalt mixing plants use fuel oil (such as heavy oil). When the fuel oil and air are not mixed sufficiently, coking can easily occur at the nozzle of the spray gun during combustion. If not dealt with promptly, the coking material will accumulate at the nozzle, easily causing nozzle blockage and affecting normal fuel injection and combustion.

[0041] In some existing burners, improvements to the internal structure of the spray gun are used to improve the fuel-air mixing state and reduce coking to some extent in order to alleviate the problem of nozzle clogging. However, these structural improvements cannot completely eliminate coking; coking will still occur at the nozzles of the spray gun during long-term use. For existing burner spray guns, if coking occurs at the nozzles, manual cleaning is required, which is time-consuming, labor-intensive, and inefficient.

[0042] The following provides some embodiments of the burner spray gun, burner, asphalt mixing plant, spray gun self-cleaning method and electronic equipment in the technical solution of the present invention.

[0043] In an embodiment of the first aspect of the invention, a burner nozzle 1 is provided, such as... Figure 1 and Figure 2 As shown, the burner nozzle 1 includes a nozzle body 11 and an igniter 13, with the igniter 13 connected to the nozzle body 11. The nozzle body 11 includes a first tube 111 and a second tube 121. The first tube 111 can be connected to a fuel line and a first air line to allow fuel and compressed air to be introduced into it. A nozzle 112 is provided on one end face of the first tube 111. The fuel introduced through the fuel line and the compressed air introduced through the first air line are mixed and atomized within the first tube 111 and sprayed outwards through the nozzle 112 for combustion. An air jet port 1211 is provided on the second tube 121, corresponding to the nozzle 112 of the first tube 111, for example... Figure 1 In the example shown, the jet nozzle 1211 and the nozzle 112 are located at the same axial end of the spray gun body 11; the second tube 121 can be connected to a gas pipeline and a second air pipeline, and the gas introduced into the second tube through the gas pipeline or the compressed air introduced into the second tube through the second air pipeline can be sprayed outward from the jet nozzle 1211 to clean the coking material at the nozzle 112. The igniter 13 is correspondingly arranged with the jet nozzle 1211 and the nozzle 112, and can ignite the oil-gas mixture sprayed from the nozzle 112 or the gas sprayed from the jet nozzle 1211.

[0044] When the burner is operating normally, the nozzle 112 of the first tube 111 sprays out the mixed oil-gas mixture, and the igniter 13 ignites the fuel sprayed from the nozzle 112 to carry out combustion. After the combustion operation is completed, the coking material at the nozzle 112 can be cleaned. Specifically, the jet nozzle 1211 of the second tube 121 can spray out gas, and the igniter 13 ignites the gas sprayed from the jet nozzle 1211 to further burn the coking material generated at the nozzle 112, so that the coking material can be fully burned to form ash. Afterwards, the second tube 121 stops spraying gas, and instead sprays compressed air outward from the jet nozzle 1211. The high-pressure airflow of the compressed air blows off the ash after the coking material is burned, thereby completing the cleaning of the coking material.

[0045] It should be noted that the first tube 111 and the second tube 121 in this embodiment are not limited to the following: Figure 1 The nested connection method shown can, of course, be replaced by other connection methods, such as side-by-side arrangement. Furthermore, in actual use, depending on the state of the coking material, it can be individually burned or individually cleaned by blowing air.

[0046] The burner nozzle 1 in this embodiment features an improved overall structure. It can self-clean the coking material generated at the nozzle 112 of the first tube 111 via the second tube 121, and can work seamlessly with normal combustion operations. No manual cleaning is required, significantly improving cleaning efficiency and providing convenience. This effectively prevents nozzle 112 blockage due to coking material accumulation, avoiding burner downtime for maintenance and improving burner efficiency. Furthermore, the nozzle body 11 and igniter 13 are integrated, optimizing the overall structure of the burner nozzle 1 and improving the accuracy of ignition operations.

[0047] In a further embodiment of the present invention, such as Figure 2 , Figure 3 and Figure 4 As shown, in the burner spray gun 1, the second tube 121 of the spray gun body 11 is fitted outside the first tube 111 to form a nested structure; the inner sidewall of the second tube 121 and the outer sidewall of the first tube 111 form a first annular airflow channel 1212, so that the gas in the second tube 121 can surround the first tube 111, and when it is sprayed out from the spray nozzle 1211, it can form an airflow around the end face of the nozzle 112 to increase the coverage area of ​​the sprayed gas and enhance the cleaning effect.

[0048] Furthermore, such as Figures 3 to 5As shown, the igniter 13 has an ignition electrode 131 at one end corresponding to the nozzle 112 and the jet port 1211. When the igniter 13 is energized, the ignition electrode 131 can generate a high-voltage electric arc to ignite the fuel-air mixture or fuel gas. The second tube 121 has a flow guiding structure 1213 at one end of the jet port 1211. The flow guiding structure 1213 is located at the outer edge of the jet port 1211 and is inclined radially inward towards the second tube 121 to guide the airflow ejected from the jet port 1211, causing the airflow to flow towards the end face closer to the nozzle 112. The flow guiding structure 1213 has an ignition hole 1214 at a position opposite to the ignition electrode 131. When the fuel gas flows into the jet port 1211 within the second tube 121, a small portion of the fuel gas is ejected from the ignition hole 1214, while most of the fuel gas is ejected outward from the jet port 1211. The gas ejected from the ignition hole 1214 is ignited by the electric arc of the ignition electrode 131, which in turn ignites the gas ejected from the jet nozzle 1211. The flame generated by the combustion of the gas ejected from the jet nozzle 1211 further burns the coking material at the nozzle 112. When compressed air is introduced into the second tube 121, a portion of the compressed air can also be injected into the ignition electrode 131 through the ignition hole 1214 to blow away dust and other debris adhering to the surface of the ignition electrode 131, preventing dust and other debris from affecting the ignition operation.

[0049] It is understandable that the inclined arrangement of the drainage structure 1213 increases the distance between the ignition electrode 131 and the jet nozzle 1211. The arrangement of the ignition hole 1214 enables the gas ejected from the jet nozzle 1211 to be accurately ignited by ignition, thus avoiding interference with the self-cleaning operation. Simultaneously, it also prevents the ignition electrode 131 from being damaged due to excessive proximity to the combustion area. Furthermore, one or more drainage structures 1213 can be arranged in the circumferential direction of the jet nozzle 1211 according to specific usage requirements, or as... Figure 3 and Figure 4 In the example, the drainage structure 1213 is arranged in a structural form that covers the circumference of the jet nozzle 1211.

[0050] Furthermore, such as Figure 4 and Figure 7As shown, the end face where the nozzle 112 is located (i.e., the end face of the first tube 111 where the nozzle 112 is located) is specifically a conical surface. Correspondingly, the nozzle 112 includes multiple spray holes 1121 connecting the inside and outside of the first tube 111, and the multiple spray holes 1121 are spaced apart along the circumferential direction of the conical surface. Preferably, the multiple spray holes 1121 are evenly arranged in the circumferential direction. Correspondingly, the drainage structure 1213 is also configured as a conical tube structure. The inclination angle of the conical tube structure is adapted to the conical surface, so that the air jet direction of the air jet nozzle 1211 is towards the outlet position of the spray hole 1121. The gas ejected from the air jet nozzle 1211 can effectively cover the conical surface, especially the outlet position of the spray hole 1121, to further enhance the cleaning effect.

[0051] In a further embodiment of the present invention, such as Figure 2 and Figure 4 As shown, an air inlet connector 122 is provided on the side wall of the second pipe body 121. The air inlet connector 122 can be connected to both the gas pipeline and the second air pipeline simultaneously. Figure 4 In the example, the air inlet connector 122 is in the form of a tee and is provided with a gas interface 1221 and a second air interface 1222, so as to connect to the gas pipeline through the gas interface 1221 and to the second air pipeline through the second air interface 1222.

[0052] Of course, intake connector 122 is not limited to Figure 2 and Figure 4 Alternatively, an independent gas interface and a second air interface can be opened on the side wall of the second pipe body 121.

[0053] Furthermore, such as Figure 2 and Figure 6 As shown, a connecting support 133 is provided on the side wall of the second pipe body 121, for example... Figure 2 On the side wall opposite to the air inlet connector 122, the igniter 13 is detachably connected to the connecting support 133, so that the igniter 13 and the spray gun body 11 are connected to form an integrated design. Specifically, the igniter 13 includes a ceramic rod 132 and an ignition electrode 131; the ignition electrode 131 passes through the ceramic rod 132 to achieve insulation through the ceramic rod 132; as... Figure 2 In the example, the end of the ignition electrode 131 corresponding to the nozzle 1211 is provided with a bent section to be close to the nozzle 1211 of the spray gun body 11; the end of the ignition electrode 131 away from the nozzle 1211 is used to connect to the high-voltage power supply device 24.

[0054] In a further embodiment of the present invention, such as Figure 4As shown, in the burner nozzle 1, the first tube 111 is provided with an oil-gas mixing chamber 113, an oil supply pipe 114, an air supply pipe 115, and an oil-gas mixing structure 116. The oil-gas mixing chamber 113 is located at the end of the first tube 111 near the nozzle 112 and is connected to the nozzle 112; the oil-gas mixing structure 116 is located at the end of the oil-gas mixing chamber 113 away from the nozzle 112, and the oil-gas mixing structure 116 is connected to the oil-gas mixing chamber 113, the oil supply pipe 114, and the air supply pipe 115 respectively. The fuel supply pipe 114 can be connected to the fuel line, and the air supply pipe 115 can be connected to the first air line. The fuel entering the fuel supply pipe 114 and the compressed air entering the air supply pipe 115 can be injected into the air-fuel mixing chamber 113 through the air-fuel mixing structure 116. At least a portion of the fuel and compressed air can be mixed in the air-fuel mixing structure 116 beforehand, so that the liquid fuel is dispersed before entering the air-fuel mixing chamber 113, and then further mixed with the compressed air to form an atomized air-fuel mixture, which is then sprayed outward from the nozzle 112. This method allows the air-fuel mixture to burn completely after being sprayed from the nozzle 112, which helps to reduce coking at the nozzle 112.

[0055] Furthermore, such as Figure 4 and Figure 8 As shown, in the first pipe body 111, the oil-gas mixing structure 116 is provided with a first connecting channel 1161, a second connecting channel 1165, and an inner connecting channel 1168. One end of the first connecting channel 1161 is connected to the oil-gas mixing chamber 113, and the other end of the first connecting channel 1161 is connected to the oil supply pipeline 114; one end of the second connecting channel 1165 is connected to the oil-gas mixing chamber 113, and the other end of the second connecting channel 1165 is connected to the gas supply pipeline 115; the inner connecting channel 1168 is located between the first connecting channel 1161 and the second connecting channel 1165, one end of the inner connecting channel 1168 is connected to the first connecting channel 1161, and the other end of the inner connecting channel 1168 is connected to the second connecting channel 1165. As the compressed air from the gas supply pipe 115 flows into the oil-gas mixing chamber 113 through the second connecting channel 1165, a portion of the compressed air enters the first connecting channel 1161 through the inner connecting channel 1168. The high-pressure airflow of the compressed air disperses the fuel liquid flow in the first connecting channel 1161. The dispersed fuel droplets are then sprayed into the oil-gas mixing chamber 113 through the first connecting channel 1161, and then mixed again with the compressed air sprayed into the oil-gas mixing chamber 113 through the second connecting channel 1165. This further reduces the size of the fuel droplets, forming an oil-gas mixture with even smaller atomized particles, which is then sprayed out through the nozzle 112, resulting in more complete combustion.

[0056] Furthermore, such as Figure 4 and Figure 8As shown, in the oil-gas mixing structure 116, the first connecting channel 1161 is arranged axially, that is, consistent with the axial direction of the spray gun body 11; one end of the first connecting channel 1161 is provided with a first oil inlet 1162, which is connected to the oil supply pipe 114; the other end of the first connecting channel 1161 is provided with a first oil outlet 1163, which is connected to the oil-gas mixing chamber 113. The second connecting channel 1165 is located radially outside the first connecting channel 1161 to surround the first connecting channel 1161 in the circumferential direction; one end of the first connecting channel 1161 is provided with a radially extending second air inlet 1166, which is connected to the air supply pipe 115; the other end of the first connecting channel 1161 is provided with an axially extending second air outlet 1167, which is connected to the oil-gas mixing chamber 113. The inner connecting channel 1168 is located in the oil-gas mixing structure 116 near the second air outlet 1167, and extends radially to connect the first connecting channel 1161 and the second connecting channel 1165 in the radial direction. This allows some of the compressed air in the second connecting channel 1165 to be injected into the first connecting channel 1161 through the inner connecting channel 1168, with the injection direction perpendicular to the flow direction of the fuel in the first connecting channel 1161. This generates a strong impact force on the fuel flow, which helps to disperse the fuel flow and form particulate fuel droplets, and promotes the mixing of fuel and air.

[0057] Furthermore, such as Figure 8 As shown, the first connecting channel 1161 also includes a primary mixing pipe section 1164, which is located at the connection between the first connecting channel 1161 and the inner connecting channel 1168. The diameter of the primary mixing pipe section 1164 is larger than the diameter of other pipe sections in the first connecting channel 1161, so as to provide relatively sufficient space for the initial mixing of fuel and compressed air when compressed air is injected into the primary mixing pipe section 1164 of the first connecting channel 1161 through the inner connecting channel 1168.

[0058] In particular, multiple internal connecting channels 1168 are provided at intervals in the circumferential direction of the primary mixing pipe section 1164, so as to set multiple compressed air injection points in the circumferential direction of the fuel flow, which is conducive to further enhancing the effect of primary mixing and promoting the degree of dispersion of the fuel flow.

[0059] Furthermore, such as Figure 2 and Figure 4 As shown, in the first pipe body 111, the gas supply pipe 115 and the oil supply pipe 114 are coaxially arranged, and the oil supply pipe 114 is located inside the gas supply pipe 115, so that the gas supply pipe 115 and the oil supply pipe 114 form a nested form; a second annular airflow channel 1151 is formed between the inner side wall of the gas supply pipe 115 and the outer side wall of the oil supply pipe, so as to cooperate with the oil-gas mixing structure 116, which is beneficial to increase the gas supply.

[0060] It should be noted that the spray gun body 11 in the above embodiments can be a one-piece structure or a split structure, for example... Figure 4 In the example, the first pipe body 111 is formed by connecting different pipe segments sequentially in the axial direction. The first pipe body 111 and the second pipe body 121 can also be connected in the form of a split structure to facilitate processing and assembly.

[0061] The following is a specific embodiment of the burner spray gun 1 of the present invention:

[0062] like Figures 1 to 4 As shown, the burner nozzle 1 includes a nozzle body 11 and an igniter 13; the nozzle body 11 includes a first tube 111 and a second tube 121; the igniter 13 includes a ceramic rod 132 and an ignition electrode 131 inserted in the ceramic rod 132.

[0063] like Figure 4 As shown, the end face of the first pipe body 111 at one end in the axial direction is a conical surface, and a nozzle 112 is provided on the conical surface. The nozzle 112 specifically includes a plurality of spray holes 1121 evenly arranged in the circumferential direction. The first pipe body 111 is provided with an oil-gas mixing chamber 113, an oil supply pipe 114, a gas supply pipe 115, and an oil-gas mixing structure 116. The oil-gas mixing chamber 113 is located inside the first pipe body 111 at one end near the nozzle 112 and is connected to multiple nozzles 1121; the oil-gas mixing structure 116 is located at the end of the oil-gas mixing chamber 113 away from the nozzle 112, and the oil supply pipe 114 and the gas supply pipe 115 are both located at the end of the oil-gas mixing structure 116 away from the oil-gas mixing chamber 113 in the axial direction; the gas supply pipe 115 is coaxially arranged with the oil supply pipe 114, and the oil supply pipe 114 is located inside the gas supply pipe 115, and a second annular airflow channel 1151 is formed between the inner side wall of the gas supply pipe 115 and the outer side wall of the oil supply pipe; the oil-gas mixing structure 116 is connected to the oil-gas mixing chamber 113, the oil supply pipe 114, and the gas supply pipe 115 respectively. The fuel supply pipe 114 is provided with a fuel inlet 1141 at the end away from the oil-gas mixing chamber 113, and a first air inlet 1152 is provided on the side wall of the air supply pipe 115 near the fuel inlet 1141.

[0064] like Figure 4 and Figure 8As shown, the oil-gas mixing structure 116 includes a first connecting channel 1161, a second connecting channel 1165, and an inner connecting channel 1168. The first connecting channel 1161 is axially arranged, with one end having a first oil inlet 1162 communicating with the oil supply pipe 114, and the other end having a first oil outlet 1163 communicating with the oil-gas mixing chamber 113. The second connecting channel 1165 is located radially outside the first connecting channel 1161 and surrounds the first connecting channel 1161 circumferentially. One end of the first connecting channel 1161 has a second air inlet 1166 extending radially and communicating with the air supply pipe 115, and the other end has a second air outlet 1167 extending axially and communicating with the oil-gas mixing chamber 113. Multiple internal connecting channels 1168 are located in the oil-air mixing structure 116 near the second air outlet 1167. These internal connecting channels 1168 are spaced apart circumferentially, and each extends radially to connect the first connecting channel 1161 and the second connecting channel 1165 radially. A primary mixing section 1164 is provided at the connection point between the first connecting channel 1161 and the internal connecting channel 1168. The diameter of the primary mixing section 1164 is larger than the diameter of other sections in the first connecting channel 1161. This provides sufficient space for the initial mixing of fuel and compressed air when some compressed air from the second connecting channel 1165 is injected into the first connecting channel 1161 through the internal connecting channel 1168. The injection direction is perpendicular to the flow direction of the fuel in the first connecting channel 1161, thereby generating a strong impact force on the fuel flow, which helps to disperse the fuel flow and form particulate fuel droplets, and promotes the mixing of fuel and air.

[0065] After initial mixing, the fuel in the initial mixing section 1164 is injected into the fuel-air mixing chamber 113 through the first fuel outlet 1163, where it is mixed again with the compressed air injected through the second air outlet 1167 of the fuel supply pipe 114. This further improves the mixing degree of the fuel gas and compressed air, further forming a fuel-air mixture in a finer atomized state, which is then sprayed out through the nozzle 1121 for combustion.

[0066] like Figure 2 , Figure 3 and Figure 4As shown, the second tube 121 of the spray gun body 11 is fitted onto the outside of the first tube 111, forming a nested structure. A first annular airflow channel 1212 is formed between the inner wall of the second tube 121 and the outer wall of the first tube 111, allowing the gas inside the second tube 121 to surround the first tube 111. A through-hole spray port 1211 is formed at the end of the second tube 121 near the nozzle 112, and when the gas is sprayed out from the spray port 1211, an airflow can be formed around the end face of the nozzle 112. The end of the second tube 121 away from the spray port 1211 is a closed structure. An air inlet connector 122 is provided on the side wall of the second tube 121. The air inlet connector 122 is in the form of a three-way connector and is provided with a gas interface 1221 and a second air interface 1222, so as to connect to the gas pipeline through the gas interface 1221 and to the second air pipeline through the second air interface 1222.

[0067] like Figures 3 to 7 As shown, the second tube 121 has a jet nozzle 1211 at one end, and a flow guiding structure 1213 is provided at the outer edge of the jet nozzle 1211. Specifically, the flow guiding structure 1213 is a conical tube structure, and the inclination angle of the conical tube structure is adapted to the conical surface, so that the jet direction of the jet nozzle 1211 is towards the outlet position of the nozzle 1121, so as to guide the airflow ejected from the jet nozzle 1211. The end of the ignition electrode 131 corresponding to the outlet has a bent section, which extends towards the flow guiding structure 1213; correspondingly, the flow guiding structure 1213 has an ignition hole 1214 at the position opposite to the bent section of the ignition electrode 131. As the gas flows from the second tube 121 into the nozzle 1211, a small portion of the gas is ejected from the ignition hole 1214, while the majority is ejected from the nozzle 1211. The gas ejected from the ignition hole 1214 is ignited by the electric arc of the ignition electrode 131, which in turn ignites the gas ejected from the nozzle 1211. The flame generated by the combustion of the gas ejected from the nozzle 1211 further burns the coking material at the nozzle 112. When compressed air is introduced into the second tube 121, a portion of the compressed air can also be injected into the ignition electrode 131 through the ignition hole 1214 to clean the dust and other particles adhering to the surface of the ignition electrode 131, preventing dust and other particles from affecting the ignition operation.

[0068] like Figure 2 and Figure 6 As shown, a connecting support 133 is provided on the other end of the side wall of the second tube 121 opposite to the air inlet connector 122. The ceramic rod 132 of the igniter 13 is detachably connected to the connecting support 133 so that the igniter 13 and the spray gun body 11 are connected to achieve integrated design.

[0069] When the burner is operating normally, the nozzle 112 of the first tube 111 sprays out the mixed oil-gas mixture, and at the same time, the ignition electrode 131 of the igniter 13 generates an electric arc, igniting the oil-gas mixture sprayed from the nozzle 112 for combustion. After the combustion operation is completed, the coking material at the nozzle 112 can be cleaned through the second tube 121. Specifically, the jet nozzle 1211 and ignition hole 1214 of the second tube 121 spray out gas, the ignition electrode 131 generates an electric arc and ignites the gas sprayed from the ignition hole 1214, which in turn ignites the gas sprayed from the jet nozzle 1211, further burning the coking material at the nozzle 112, so that the coking material is fully burned to form ash; then, the second tube 121 stops spraying gas and instead sprays compressed air outward from the jet nozzle 1211, using the high-pressure airflow of the compressed air to blow off the ash after the coking material is burned, and at the same time to perform a blowing cleaning operation on the ignition electrode 131, thereby completing the cleaning treatment of the coking material.

[0070] A burner 2 is provided in a second aspect embodiment of the present invention, such as Figure 1 and Figure 9 As shown, the burner 2 includes a fuel supply device 21, a gas supply device 22, a compressed air supply device 23, a high-voltage power supply device 24, a burner nozzle 1 as described in any of the embodiments of the first aspect, and a controller 25. The first tube 111 of the burner nozzle 1 is connected to the fuel supply device 21 and the compressed air supply device 23 to supply fuel and compressed air to the first tube 111 for combustion. The nozzle tube of the burner nozzle 1 is connected to the gas supply device 22 and the compressed air supply device 23 to supply gas and compressed air to the second tube 121 for self-cleaning. The igniter 13 of the burner nozzle 1 is electrically connected to the high-voltage power supply device 24 to supply high-voltage electricity to the igniter 13, causing an electric arc to be generated at the ignition electrode 131 of the igniter 13 for ignition. The controller 25 is communicatively connected to the fuel supply device 21, the gas supply device 22, the compressed air supply device 23, and the high-voltage power supply device 24 to send control commands to the above devices to control the operation and work of the above devices and realize the automatic cleaning operation of the burner nozzle 1.

[0071] The fuel supply device 21 includes, but is not limited to, fuel lines, fuel tanks, fuel pumps and corresponding control valves; the gas supply device 22 includes, but is not limited to, gas lines, gas storage containers, gas pumps and corresponding control valves; and the compressed air supply device 23 includes, but is not limited to, first air lines, second air lines, compressed air storage containers and control valves.

[0072] It should be noted that the various devices in the burner 2 in this embodiment can be integrated into the same structure (e.g., integrated into the same housing), or they can be arranged in a distributed manner according to the specific usage requirements of the application scenario. The controller 25 can be a dedicated control module, or it can be a submodule of the control system in the application equipment of the burner 2 (e.g., an asphalt mixing plant).

[0073] Furthermore, the burner 2 in this embodiment should also have all the beneficial effects of the burner nozzle 1 in any of the embodiments of the first aspect described above, which will not be repeated here.

[0074] An embodiment of the third aspect of the present invention provides an asphalt mixing plant 3, such as Figure 9 and Figure 10 As shown, the asphalt mixing plant 3 includes the burner of any of the above embodiments to perform combustion operations according to the working requirements of the asphalt mixing plant 3. The asphalt mixing plant 3 in this embodiment has all the beneficial effects of the burner of any of the above embodiments, which will not be repeated here.

[0075] An embodiment of the fourth aspect of the present invention provides a self-cleaning method for a spray gun, which can be used for the burner spray gun in any of the above embodiments. For example... Figure 11 As shown, the spray gun self-cleaning method includes:

[0076] Step S200: Inject gas through the jet nozzle of the burner gun to the nozzle, ignite the gas ejected from the jet nozzle and burn the coking material, and continue for a first duration;

[0077] Step S300: After the first duration, stop injecting gas and inject compressed air into the nozzle through the jet nozzle for a second duration.

[0078] In this embodiment, in step S200, gas is supplied to the second tube of the burner nozzle, causing the jet nozzle of the second tube to inject gas into the nozzle and ignite it. The flame from the gas combustion burns the coking material at the nozzle, and the combustion process is controlled to continue for a first duration to ensure that the coking material is fully burned and forms ash. Then, in step S300, after the first duration, the gas injection stops, and compressed air is supplied to the second tube of the burner nozzle, causing the jet nozzle to inject compressed air into the nozzle. The high-pressure airflow of the compressed air blows away the ash formed after the coking material burns. The compressed air injection control continues for a second duration and then stops, ending the self-cleaning operation.

[0079] It is understandable that coking is usually the residue of incompletely burned fuel. By igniting the coking with fuel gas for a certain period of time, the coking can be fully burned and form ash. The stickiness and adhesion of the ash are greatly reduced, and it can be blown off by a high-pressure airflow, causing the coking ash to detach from the nozzle.

[0080] The first and second durations can be set according to specific circumstances such as application scenarios and fuel types.

[0081] The self-cleaning method of the spray gun in this embodiment can perform cleaning operations such as re-burning and blowing on the coking material generated at the nozzle of the first tube 111 through the second tube body. No manual cleaning is required, and the cleaning efficiency and automation level are greatly improved. It is convenient and fast, and can effectively reduce the phenomenon of nozzle blockage caused by coking material accumulation and the resulting burner shutdown maintenance operations, which is conducive to improving the working efficiency of the burner.

[0082] A further embodiment of the present invention provides a self-cleaning method for a spray gun. For example... Figure 12 As shown, the spray gun self-cleaning method includes:

[0083] Step S210: After receiving the self-cleaning start signal, gas is introduced into the second tube of the burner nozzle through the gas pipeline, and power is supplied to the igniter of the burner nozzle at the same time.

[0084] Step S220: After the gas ejected from the nozzle is ignited, stop supplying power to the igniter;

[0085] Step S230: After the gas ejected from the jet nozzle has burned for a first duration, control the gas pipeline to stop supplying gas to the second pipe;

[0086] Step S300: After the first duration, stop injecting gas and inject compressed air into the nozzle through the jet nozzle for a second duration.

[0087] In this embodiment, step S200 of the above embodiment is further improved. Through steps S210 to S220, after receiving the self-cleaning activation signal for the burner nozzle, gas is supplied to the second tube of the burner nozzle via the gas pipeline, causing the nozzle of the second tube to spray gas towards the nozzle. Simultaneously, power is supplied to the igniter of the burner nozzle, causing an electric arc to be generated at the ignition electrode of the igniter, igniting the gas sprayed from the nozzle. After the gas sprayed from the nozzle is ignited, the coking material at the nozzle begins to be reburned. At this point, no further ignition operation is needed, so power is stopped to the igniter, and the igniter stops working. Through step S230, after the gas sprayed from the nozzle has burned for a first duration, the coking material has been completely burned into ash. At this point, the gas pipeline is stopped supplying gas to the second tube, ending the reburning operation of the coking material, so that the second tube can provide a passage for subsequent blowing operations.

[0088] Furthermore, in the above embodiments, the self-cleaning activation signal in the jet self-cleaning method can be triggered by a manual control command. For example, the operator can input a manual control command through the operating equipment or the background control system to trigger the self-cleaning activation signal and perform the self-cleaning operation. This manual control triggering method offers high flexibility, allowing the operator to selectively activate the self-cleaning operation based on the severity of the coking phenomenon.

[0089] Of course, the self-cleaning activation signal can also be set to automatic triggering, for example, triggered by the end signal of the internal fuel purging operation of the burner nozzle. It can be understood that after normal combustion operations, some fuel remains inside the first tube of the burner nozzle. Compressed air is typically introduced into the first tube after combustion to purge the residual fuel. By triggering the self-cleaning activation signal through the end signal of the internal fuel purging operation, the self-cleaning operation of coke deposits on the burner nozzle can be organically combined with the internal fuel purging operation, achieving fully automated control of the entire process and further improving the working efficiency of the burner nozzle.

[0090] An embodiment of the fifth aspect of the present invention provides an electronic device. The electronic device includes a processor and a memory, wherein the memory stores a computer program suitable for execution in the processor. When the processor executes the computer program in the memory, it can implement the spray gun self-cleaning method of any of the above embodiments to achieve automatic cleaning of coking material at the nozzle of the burner spray gun.

[0091] Furthermore, electronic devices can be equipped with communication interfaces and communication buses, in which the processor, communication interface, and memory communicate with each other through the communication bus.

[0092] The electronic device in this embodiment has all the beneficial effects of the wheeled paver drive control method in any of the above embodiments, and will not be repeated here.

[0093] In addition, one embodiment of the present invention provides a readable storage medium storing a computer program that, when executed by a processor, implements the spray gun self-cleaning method of any of the above embodiments. Therefore, the readable storage medium in this embodiment possesses all the beneficial effects of the spray gun self-cleaning method of any of the above embodiments, and will not be elaborated further here.

[0094] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0095] The block diagrams of the devices, apparatuses, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it. It should also be noted that in the apparatuses and devices of this invention, the components can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the invention.

[0096] The computer program product of this invention can be written in any combination of one or more programming languages ​​to execute the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0097] The readable storage medium in this invention can be any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, including but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0098] The above description has been given for illustrative and descriptive purposes. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features of the invention herein.

[0099] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A burner spray gun, characterized in that, include: The spray gun body (11) includes a first tube (111) and a second tube (121); a nozzle (112) for spraying an oil-gas mixture is provided on the end face of one end of the first tube (111); an air jet (1211) is provided on the second tube (121) at a position opposite to the nozzle (112), the air jet (1211) is used to spray gas and clean the coking material at the nozzle (112) by burning the gas, or the air jet (1211) is used to spray compressed air and clean the nozzle (112) by blowing air. Igniter (13) is connected to the spray gun body (11). The igniter (13) is correspondingly arranged with the nozzle (112) and the jet port (1211) to ignite the oil-gas mixture or the gas. The second tube (121) is sleeved on the outside of the first tube (111), and a first annular airflow channel (1212) is formed between the inner wall of the second tube (121) and the outer wall of the first tube (111). The igniter (13) is provided with an ignition electrode (131) at one end corresponding to the nozzle (112) and the jet port (1211). The outer edge of the jet nozzle (1211) is provided with a flow guiding structure (1213), which is inclined toward the radial inner side of the second tube (121). The flow guiding structure (1213) is provided with an ignition hole (1214) at the position opposite to the ignition electrode (131). When the gas ejected from the ignition hole (1214) is ignited, it can ignite the gas ejected from the jet nozzle (1211).

2. The burner nozzle according to claim 1, characterized in that, The end face of the nozzle (112) is a conical surface. The nozzle (112) includes a plurality of spray holes (1121), and the plurality of spray holes (1121) are spaced apart along the circumferential direction of the conical surface. The drainage structure (1213) is a conical tube structure adapted to the conical surface.

3. The burner nozzle according to claim 1, characterized in that, The second pipe body (121) is provided with an air inlet connector (122) on its side wall, and the air inlet connector (122) is connected to the gas pipeline and the second air pipeline; The second tube (121) is also provided with a connecting support (133) on its side wall, and the igniter (13) is detachably connected to the connecting support (133).

4. The burner nozzle according to any one of claims 1 and 3, characterized in that, The first pipe body (111) is provided with an oil-gas mixing chamber (113), an oil supply pipe (114), a gas supply pipe (115) and an oil-gas mixing structure (116). One end of the oil-gas mixing chamber (113) is connected to the nozzle (112); The fuel supply pipe (114) is adapted to be connected to a fuel line, and the air supply pipe (115) is adapted to be connected to a first air line; The oil-gas mixing structure (116) is located at one end of the oil-gas mixing chamber (113) away from the nozzle (112) and is connected to the oil-gas mixing chamber (113), the oil supply pipe (114) and the gas supply pipe (115).

5. The burner nozzle according to claim 4, characterized in that, The oil-gas mixing structure (116) is provided with a first connecting channel (1161), a second connecting channel (1165) and an inner connecting channel (1168). The two ends of the first connecting channel (1161) are respectively connected to the oil-gas mixing chamber (113) and the oil supply pipeline (114); The two ends of the second connecting channel (1165) are respectively connected to the oil-gas mixing chamber (113) and the gas supply pipe (115); The two ends of the inner connection channel (1168) are respectively connected to the first connection channel (1161) and the second connection channel (1165).

6. The burner nozzle according to claim 5, characterized in that, The first connecting channel (1161) is arranged along the axial direction, and the two ends of the first connecting channel (1161) are respectively provided with a first oil inlet (1162) and a first oil outlet (1163) arranged along the axial direction. The second connecting channel (1165) is located radially outside the first connecting channel (1161). The connection between the second connecting channel (1165) and the gas supply pipe (115) is provided with a second air inlet (1166) extending radially. The connection between the second connecting channel (1165) and the oil-gas mixing chamber (113) is provided with a second air outlet (1167) extending axially. The inner connecting channel (1168) is located near the second air outlet (1167), and the inner connecting channel (1168) is arranged radially.

7. The burner nozzle according to claim 6, characterized in that, The first connecting channel (1161) includes a primary mixing pipe section (1164), which is located at the connection between the first connecting channel (1161) and the inner connecting channel (1168), and the diameter of the primary mixing pipe section (1164) is larger than the diameter of other pipe sections in the first connecting channel (1161). The number of the inner connecting channels (1168) is multiple, and the multiple inner connecting channels (1168) are arranged at circumferential intervals along the initial mixing pipe section (1164).

8. The burner nozzle according to claim 4, characterized in that, The gas supply pipe (115) and the oil supply pipe (114) are coaxially arranged. The oil supply pipe (114) is located inside the gas supply pipe (115), and a second annular airflow channel (1151) is formed between the inner wall of the gas supply pipe (115) and the outer wall of the oil supply pipe (114).

9. A burner, characterized in that, include: Fuel supply device (21), gas supply device (22), compressed air supply device (23), high voltage power supply device (24). as well as The burner nozzle as described in any one of claims 1 to 8, wherein the first tube (111) is connected to the fuel supply device (21) and the compressed air supply device (23), the second tube (121) is connected to the gas supply device (22) and the compressed air supply device (23), and the igniter (13) is electrically connected to the high-voltage power supply device (24); The controller (25) is communicatively connected to the fuel supply device (21), the gas supply device (22), the compressed air supply device (23), and the high-voltage power supply device (24).

10. An asphalt mixing plant, characterized in that, include: The burner as described in claim 9.

11. A self-cleaning method for a burner spray gun, used for any burner spray gun as described in any one of claims 1 to 10, characterized in that, include: Gas is injected through the jet nozzle of the burner gun to the nozzle, igniting the gas ejected from the jet nozzle and burning the coking material, and this continues for a first duration. After the first duration, the gas injection stops, and compressed air is injected into the nozzle through the jet nozzle for a second duration.

12. The self-cleaning method for a spray gun according to claim 11, characterized in that, The process of injecting gas through the nozzle of the burner gun to the nozzle, igniting the gas ejected from the nozzle and burning the coking material, and continuing for a first duration, includes: Upon receiving the self-cleaning activation signal, gas is supplied to the second tube of the burner nozzle through the gas pipeline, and power is simultaneously supplied to the igniter of the burner nozzle. After the gas ejected from the jet nozzle is ignited, the power supply to the igniter is stopped; After the gas ejected from the jet nozzle has burned for a first duration, the gas pipeline is controlled to stop supplying gas to the second pipe.

13. The self-cleaning method for a spray gun according to claim 12, characterized in that, The self-cleaning activation signal is triggered by a manual control command; or The self-cleaning activation signal is triggered by the end signal of the internal fuel purging operation of the burner nozzle.

14. An electronic device, characterized in that, include: processor; A memory containing a computer program, wherein the processor executes the computer program to implement the spray gun self-cleaning method as described in any one of claims 11 to 13.

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