A flameless combustor capable of combusting gas and solid fuels simultaneously

Abstract

The present application belongs to the flameless burner related technical field, it discloses a kind of gas-solid fuel can simultaneously burn's flameless burner, the flameless burner includes gas combustion nozzle, solid combustion nozzle and combustion chamber, one the solid combustion nozzle and two the gas combustion nozzle are set on the combustion chamber wall;The solid combustion nozzle includes solid fuel channel, sudden expansion cavity, first oxidant pipeline, recirculation flue gas pipeline and center body, two the sudden expansion cavity is symmetrically set on the two sides opposite of first oxidant pipeline;Two the recirculation oxygen pipeline is respectively connected with one end of two the sudden expansion cavity;The solid fuel channel is Y-shaped, and one end is divided into two and is connected with two the sudden expansion cavity;Two the sudden expansion cavity is away from the one end of the solid fuel channel respectively suspended one the center body in front.The structure of the flameless burner is simple, and the efficiency is higher.

Description

Technical Field

[0001] This invention belongs to the technical field of flameless burners, and more specifically, relates to a flameless burner that can simultaneously burn gaseous and solid fuels. Background Technology

[0002] In recent years, thanks to the development of a series of advanced combustion technologies, the problem of low fuel utilization in the burner field has been significantly improved, and the utilization rate of various fuels has reached a relatively high level. However, with the increasing severity of air pollution, pollutants in combustion exhaust have gradually become a focus of public concern. In response, a series of stricter emission standards have been promulgated, setting clear requirements for the content of various pollutants in flue gas. Some traditional combustion technologies can no longer meet these stringent targets. Therefore, achieving and popularizing clean combustion technologies at this stage is particularly important. Flameless combustion, also known as flameless oxidation, is a combustion mode in a low-oxygen atmosphere after the reactants are diluted. Due to its advantages such as uniform heat flow distribution, no localized oxygen enrichment, and low and uniform combustion temperature, it has been widely studied and adopted worldwide and is considered one of the most promising combustion technologies of this century, as well as an important means to meet pollutant emission standards.

[0003] A burner is a general term for a device that sprays fuel and oxidizer in a specific manner for combustion. Based on its working principle, a burner can be defined as a device that converts a substance into heat energy through the chemical reaction of combustion. Therefore, improving the burner structure is key to realizing new combustion technologies. Burners can be classified in various ways according to their different properties. Based on the fuel source, they are divided into oil burners, gas burners, light oil burners, and dual-fuel burners, which are essentially solid, gaseous, and liquid fuels. Currently, single-fuel burners are the most common, as they can centrally achieve their main functions. However, multi-fuel burners generally suffer from complex structures and high phase interference between different fuels. Summary of the Invention

[0004] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a flameless burner that can burn gaseous and solid fuels simultaneously, which aims to solve the problem of the complex structure of existing burners.

[0005] To achieve the above objectives, according to one aspect of the present invention, a flameless burner capable of simultaneous combustion of gaseous and solid fuels is provided. The flameless burner includes a gas combustion nozzle, a solid combustion nozzle, and a combustion chamber. One solid combustion nozzle and two gas combustion nozzles are disposed on the wall of the combustion chamber. The solid combustion nozzle includes a solid fuel channel, a sudden expansion chamber, a first oxidant conduit, a recirculated flue gas conduit, and a central bluff body. The two sudden expansion chambers are symmetrically disposed on opposite sides of the first oxidant conduit. The two recirculated oxygen conduits are respectively connected to one end of the two sudden expansion chambers. The solid fuel channel is Y-shaped, with one end divided into two and respectively connected to the two sudden expansion chambers. A central bluff body is suspended in front of the end of each of the two sudden expansion chambers away from the solid fuel channel.

[0006] Furthermore, the solid combustion nozzle also includes a blunt body support, one end of which is connected to the expansion cavity and the other end of which is connected to the central blunt body.

[0007] Furthermore, the ratio of the diameter D of the cross-sectional area of ​​the expansion cavity to the pipe length L is 0.25 to 0.5.

[0008] Furthermore, the ratio of the outlet area of ​​the first oxidizer conduit of the solid combustion nozzle to the outlet area of ​​the single solid fuel conduit is 3 to 5.

[0009] Furthermore, the ratio of the cross-sectional area of ​​the recirculated flue gas duct to the cross-sectional area of ​​the solid fuel passage at the end furthest from the expansion cavity is 0.8 to 1.2.

[0010] Furthermore, the gas combustion nozzle includes a cylindrical cavity, a gas fuel pipe, a gas fuel pipeline, a gas fuel turbulence pipeline, a second oxidant pipe, an oxidant turbulence pipeline, and an oxidant pipeline; one end of the cylindrical cavity is closed, forming a closed end; the gas fuel pipe and the gas fuel turbulence pipeline are connected in parallel, with one end connected and the other end passing through the closed end and extending into the cylindrical cavity; the second oxidant pipe and the oxidant turbulence pipeline are connected in parallel, with one end connected and the other end passing through the closed end and extending into the cylindrical cavity; both the oxidant pipeline and the gas fuel pipeline are arc-shaped, and are respectively spaced apart on both sides of the cylindrical cavity.

[0011] Furthermore, the gas combustion nozzle also includes a gas fuel pipeline bluff body, an oxidant pipeline bluff body, and a lifting bluff body; a receiving space is formed between the oxidant pipeline and the gas fuel pipeline, and the receiving space is used to receive the lifting bluff body; the oxidant pipeline bluff body and the gas fuel bluff body are respectively disposed in the oxidant pipeline and the gas fuel pipeline.

[0012] Furthermore, the lengths of the oxidant pipeline and the gaseous fuel pipeline are less than the length of the cylindrical cavity, so that one end of the cylindrical cavity forms a premixing chamber.

[0013] Furthermore, the gas combustion nozzle also includes a fuel-side support rod and an oxidizer-side support rod. The lifting blunt body is disposed between the oxidizer pipeline and the gas fuel pipeline, and has two blunt body support rod sliding tracks. The fuel-side support rod and the oxidizer-side support rod are both basically L-shaped, and one end of each rod passes through the closed end, the blunt body support rod sliding track, and the gas fuel pipeline or the oxidizer pipeline in sequence, and then connects to the gas fuel pipeline blunt body and the oxidizer pipeline blunt body. The fuel-side support rod and the oxidizer-side support rod are movably connected to the two blunt body support rod sliding tracks.

[0014] Furthermore, the closed end is also provided with a driver. The fuel-side support rod and the oxidant-side support rod are respectively connected to the driver. The driver is used to drive the lifting blunt body, the oxidant pipeline blunt body, and the gas fuel pipeline blunt body to move together along the axial direction of the cylindrical cavity to adjust the premixing state of the gas fuel and the oxidant. The fuel-side support rod and the oxidant-side support rod are driven to move radially by sliding on the sliding tracks of the two blunt body support rods, thereby driving the gas fuel pipeline blunt body and the oxidant pipeline blunt body to move radially to change the opening degree of the gas fuel pipeline and the oxidant pipeline.

[0015] In summary, compared with the prior art, the flameless burner for simultaneous combustion of gaseous and solid fuels provided by the present invention has the following advantages:

[0016] 1. When powdered solid fuel is injected into the symmetrically arranged expansion chamber through a Y-shaped solid fuel pipe, it undergoes a swirling motion. Compared to existing single-chamber oscillating jets, the dual-chamber design increases the overall oscillation frequency of the jet. The two swirling jets converge before the oxidant pipe outlet and are pushed downstream of the combustion chamber by the oxidant jet for combustion. The flue gas injected into the expansion chamber through the recirculated flue gas pipe helps to agitate the solid fuel, promoting its full rotation and convergence within the chamber, improving mixing efficiency, aiding in NOx re-burning and reduction, reducing emissions, and offering a simple structure.

[0017] 2. A central blunt body suspended in front of the expansion cavity helps maintain the stability of the jet oscillation and reduces drag loss.

[0018] 3. The gas combustion nozzle allows for adjustment of the premixing state of the gaseous fuel and oxidizer by adjusting the lifting blunt body, thus facilitating the switching between flamed and flameless combustion states. Simultaneously, by moving the push-pull support rod within the sliding track of the blunt body support rod, the opening of the gaseous fuel and oxidizer pipelines can be adjusted separately, thereby regulating the jet velocity while maintaining a constant flow rate, providing a wide adjustment range. Furthermore, the inclusion of a turbulence-prone pipeline further optimizes the mixing effect within the premixing chamber.

[0019] 4. The gas and solid combustion nozzles in this invention can not only burn independently, but also burn in synergy. The jets at different velocities burn in different areas of the combustion chamber. The gaseous fuel jet has a smaller flow rate and burns in the upper part of the combustion chamber, while the jet from the solid combustion nozzle carries the powdered fuel to the lower part of the combustion chamber for combustion. The heat flux density distribution in the overall combustion area is more uniform, effectively avoiding local oxygen enrichment, thereby improving the stability and thermal efficiency of combustion and reducing pollutant emissions. Attached Figure Description

[0020] Figure 1 This is an installation diagram of a flameless burner that can simultaneously burn gaseous and solid fuels, provided by the present invention.

[0021] Figure 2 yes Figure 1 A schematic diagram of the solid combustion nozzle of a flameless burner that allows for the simultaneous combustion of gaseous and solid fuels;

[0022] Figure 3 yes Figure 2 A cross-sectional view of a solid combustion nozzle in a [the image / structure].

[0023] Figure 4 (a) and (b) in the text are respectively Figure 1 Cross-sectional views of the gas combustion nozzle at two angles of a flameless burner that can simultaneously burn gaseous and solid fuels.

[0024] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-solid combustion pipe, 2-sudden expansion cavity, 3-first oxidant pipe, 4-recirculated flue gas pipe, 5-central bluff body, 6-bluff body support, 7-gaseous fuel pipe, 8-gaseous fuel pipeline, 9-gaseous fuel turbulence pipeline, 10-second oxidant pipe, 11-oxidant pipeline, 12-oxidant turbulence pipeline, 13-buff body of gaseous fuel pipeline, 14-buff body of oxidant pipeline, 15-fuel side support rod, 16-oxidant side support rod, 17-lifting bluff body, 18-buff body support rod sliding track. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Please see Figure 1 This invention provides a flameless burner capable of simultaneously burning gaseous and solid fuels. The flameless burner has a relatively simple structure, with burners arranged in parallel and oxidizer supplied in stages for both fuel states. The oxidizer line 11 is positioned close to the fuel line. Furthermore, by adjusting the jet state of the flameless burner, the entire combustion chamber can achieve a flameless combustion state. In this state, combustion is stable, effectively improving fuel burnout rate and reducing pollutant generation.

[0027] The flameless burner includes a gas combustion nozzle, a solid combustion nozzle, and a combustion chamber. One solid combustion nozzle and two gas combustion nozzles are disposed on the wall of the combustion chamber, and the three are respectively located at the three vertices of the same triangle. The angle formed by the line connecting the three center lines and the assumed center of the circle is preferably 100° to 140°, that is, the included angles between each combustion nozzle are approximately similar, thereby achieving uniform configuration and good separation. At the same time, the jet length of each combustion nozzle is different, which can realize combustion in different and larger areas of the combustion chamber.

[0028] Please see Figure 2 and Figure 3 The solid combustion nozzle includes a solid fuel channel, a sudden expansion chamber 2, a first oxidant pipe 3, a recirculated flue gas pipe 4, a central blunt body 5, and a blunt body support 6. Two sudden expansion chambers 2 are symmetrically arranged on opposite sides of the first oxidant pipe 3. Two recirculated oxygen pipes are connected to one end of each of the two sudden expansion chambers 2. The solid fuel channel is Y-shaped, splitting into two parts that connect to the two sudden expansion chambers 2 respectively, enabling the solid powder fuel to generate a self-excited oscillating jet. This method has significant advantages in reducing nitrogen oxide emissions and saving energy. The two sudden expansion chambers 2 are vertically symmetrical about the first oxidant pipe 3, allowing the two powder streams to converge at the outlet of the first oxidant pipe 3 and be carried downstream of the combustion chamber by the oxidant jet for combustion, thus avoiding "oxygen-competing" combustion with gaseous fuel. Furthermore, the solid fuel channel and the two recirculated flue gas pipes 4 are located on the same side of the sudden expansion chambers 2.

[0029] A central blunt body 5 is suspended in front of each of the two expansion cavities 2 at the end furthest from the solid fuel channel to maintain continuous jet oscillation and reduce drag loss. One end of the blunt body support 6 is connected to the expansion cavity 2, and the other end is connected to the central blunt body 5.

[0030] The cross-sectional area of ​​the expansion chamber 2 is sufficiently large compared to the triangular nozzle of the solid fuel channel. The ratio of the diameter D of the cross-sectional area of ​​the expansion chamber 2 to the pipe length L is preferably 0.25 to 0.5 to satisfy the jetting conditions. The ratio of the outlet area of ​​the first oxidizer pipe 3 of the solid combustion nozzle to the outlet area of ​​the single solid fuel pipe is preferably 3 to 5.

[0031] The ratio of the cross-sectional area of ​​the recirculated flue gas duct 4 of the solid combustion nozzle to the cross-sectional area of ​​the end of the solid fuel passage away from the expansion cavity 2 is 0.8 to 1.2.

[0032] The recirculated flue gas duct 4 of the solid combustion nozzle extracts part of the flue gas from the tail flue of the combustion chamber and re-injects it into the expansion chamber 2. This promotes large-scale swirling and forward movement of the solid fuel within the expansion chamber 2, and allows for greater overlap and convergence of the fuel before the nozzle of the first oxidant duct 3. Simultaneously, this facilitates the reduction of NO in the flue gas. x Re-ignition and reduction.

[0033] Please see Figure 3 and Figure 4 The gas combustion nozzle includes a cylindrical cavity, a gas fuel pipe 7, a gas fuel pipeline 8, a gas fuel turbulence pipeline 9, a second oxidant pipe 10, an oxidant turbulence pipeline 12, an oxidant pipeline 11, a gas fuel pipeline blunt body 13, an oxidant pipeline blunt body 14, a fuel side support rod 15, an oxidant side support rod 16, and a lifting blunt body 17.

[0034] One end of the cylindrical cavity is closed, forming a closed end. The gaseous fuel pipeline 7 is connected in parallel with the gaseous fuel turbulence pipeline 9, with one end connected and the other end passing through the closed end and extending into the cylindrical cavity. The fuel ejected from the turbulence pipeline with a smaller cross-sectional area can disturb the fuel and oxidant in the premixing chamber to promote further mixing, while also preventing fuel accumulation in the pipeline due to this blunt structure. The second oxidant pipeline 10 has the same structure.

[0035] The second oxidant pipe 10 is connected in parallel with the oxidant turbulence pipe 12, and one end of the two is connected to each other, while the other end passes through the closed end and extends into the cylindrical cavity.

[0036] Both the oxidant line 11 and the gaseous fuel line 8 are arc-shaped and are respectively spaced apart on both sides of the cylindrical cavity. A receiving space is formed between the oxidant line 11 and the gaseous fuel line 8, which is used to house the lifting blunt body 17. In this embodiment, the lengths of the oxidant line 11 and the gaseous fuel line 8 are less than the length of the cylindrical cavity, such that one end of the cylindrical cavity forms a premixing chamber. The oxidant line blunt body 14 and the gaseous fuel blunt body are respectively disposed in the oxidant line and the gaseous fuel line 8.

[0037] The lifting blunt body 17 is disposed between the oxidant pipeline and the gaseous fuel pipeline 8, and has two blunt body support rod sliding rails 18. The fuel-side support rod 15 and the oxidant-side support rod 16 are both basically L-shaped, with one end passing through the closed end, the blunt body support rod sliding rail, and the gaseous fuel pipeline 8 or the oxidant pipeline respectively, and then connecting to the gaseous fuel pipeline blunt body 13 and the oxidant pipeline blunt body 14. The fuel-side support rod 15 and the oxidant-side support rod 16 are movably connected to the two blunt body support rod sliding rails 18 respectively.

[0038] The closed end is also provided with a driver. The fuel-side support rod 15 and the oxidant-side support rod 16 are respectively connected to the driver. The driver is used to drive the lifting blunt body 17, the oxidant pipeline blunt body 14 and the gas fuel pipeline blunt body 13 to move together along the axial direction of the cylindrical cavity to adjust the premixing state of the gas fuel and the oxidant. When it rises to the top and is level with the pipeline outlet, the gas combustion nozzle is in a non-premixed state. When it falls to the bottom, the gas combustion nozzle is in a partially premixed state, that is, the gas fuel and the oxidant are premixed before being injected into the combustion chamber.

[0039] The fuel-side support rod 15 and the oxidant-side support rod 16 are moved radially by sliding on the two blunt support rod sliding tracks 18, thereby causing the blunt body 13 of the gas fuel pipeline and the blunt body 14 of the oxidant pipeline to move radially, so as to change the opening of the gas fuel pipeline and the oxidant pipeline and adjust the jet velocity while keeping the flow rate constant.

[0040] The ratio of the cross-sectional area at the inlet of the oxidant pipeline to the cross-sectional area at the inlet of the gaseous fuel pipeline is preferably 7 to 9, so as to achieve the oxidant to fuel flow ratio for normal gaseous fuel combustion.

[0041] The ratio of the cross-sectional area at the inlet of the oxidant pipeline to the cross-sectional area of ​​the oxidant turbulence pipeline 12 is 6 to 7. Since the turbulence pipeline only serves to turbulent the flow and is located in the middle of the premixing chamber, blockage may occur in the area near the blunt body. However, the blocked gas only accounts for a small part of the jet. In order to reduce processing costs, the anti-blockage pipeline should not be designed to be too large.

[0042] The ratio of the cross-sectional area at the inlet of the gas fuel pipeline to the cross-sectional area of ​​the gas fuel turbulence pipeline 9 is preferably 2.5 to 3.5.

[0043] The position of the gaseous fuel pipeline 7 corresponds to the position of the gaseous fuel pipeline. The position of the oxidant pipeline corresponds to the position of the oxidant pipeline. The position of the oxidant turbulence pipeline 12 corresponds to the space between the oxidant pipeline and the lifting blunt body 17. The position of the gaseous fuel turbulence pipeline 9 corresponds to the space between the lifting blunt body 17 and the gaseous fuel pipeline.

[0044] The gas fuel turbulence pipe 9 and oxidant turbulence pipe 12 of the gas combustion nozzle provide additional channels for gas fuel and oxidant to flow into the premixing chamber. The design of the double-slit blunt body optimizes the fluid mixing and backflow state in the pipe and the premixing chamber, while avoiding the blockage phenomenon below the blunt body 13 of the gas fuel pipe and the blunt body 14 of the oxidant pipe.

[0045] When the flameless burner is in operation, firstly, the lifting blunt body 17 of the gas combustion nozzle is raised axially to its highest point, level with the burner outlet. Gaseous fuel and oxidizer are then introduced into the two pipes respectively and injected into the combustion chamber for pre-combustion, ensuring that the temperature at any point in the combustion chamber exceeds the auto-ignition point of the fuel. During this process, a large-scale entrainment effect is generated on the surrounding oxidizer. After sufficient preheating, the fuel-side support rod 15 and the oxidizer-side support rod 16 are pushed within the sliding track 18 of the blunt body support rod to move the blunt body 13 of the gas fuel pipe and the blunt body 14 of the oxidizer pipe radially outward, respectively. This reduces the opening of the two pipes, increases the jet velocity, and gradually promotes the transition of combustion to a flameless combustion state.

[0046] Once the flameless combustion state is established, the lifting blunt body 17 can be lowered to any height to adjust to a partially premixed state. This means that the gaseous fuel and oxidizer are mixed in the premixing chamber before being injected into the combustion chamber, achieving better flameless combustion. Subsequently, fuel and oxidizer are gradually introduced into the solid combustion nozzle, controlling the momentum of the solid fuel jet to ensure combustion primarily downstream of the combustion chamber, while the gaseous fuel burns primarily upstream, avoiding oxygen competition between them. Since the air-fuel ratio and jet velocity of the gas combustion nozzle can be adjusted within a certain range, different heat power inputs can be achieved by comprehensively adjusting the two combustion nozzles. Because the flameless combustion state is already stable at this point, the above adjustments will not significantly affect the combustion state.

[0047] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gas-solid fuel simultaneous combustion flameless combustor, characterized in that: the flameless combustor comprises gas combustion nozzles, solid combustion nozzles and a combustion chamber, one of the solid combustion nozzles and two of the gas combustion nozzles are arranged on the wall of the combustion chamber; the solid combustion nozzle comprises a solid fuel channel, two divergent cavities, a first oxidant pipeline, two recirculated flue gas pipelines and a central bluff body, the two divergent cavities are symmetrically arranged on the two sides of the first oxidant pipeline; the two recirculated flue gas pipelines are respectively connected with one end of the two divergent cavities; the solid fuel channel is Y-shaped, one end of which is divided into two parts and connected with the two divergent cavities respectively; one of the central bluff bodies is respectively hung in front of the two divergent cavities away from the solid fuel channel; the gas combustion nozzle comprises a cylindrical cavity, a gas fuel pipeline, a gas fuel pipeline, a gas fuel spoiler pipeline, a second oxidant pipeline, an oxidant spoiler pipeline and an oxidant pipeline; one end of the cylindrical cavity is closed to form a closed end; the gas fuel pipeline and the gas fuel spoiler pipeline are connected in parallel, one end of which is connected, and the other end respectively penetrates through the closed end and extends into the cylindrical cavity; the second oxidant pipeline and the oxidant spoiler pipeline are connected in parallel, and one end of which is connected, and the other end penetrates through the closed end and extends into the cylindrical cavity; the oxidant pipeline and the gas fuel pipeline are both arc-shaped, and are respectively arranged on the two sides of the cylindrical cavity. The solid combustion nozzle further comprises a bluff body support, one end of which is connected to the divergent cavity, and the other end is connected to the central bluff body.

2. The gas-solids fuel, simultaneous combustion capable, flameless combustor of claim 1 wherein: The ratio of the diameter D of the cross-sectional area of the divergent cavity to the length L of the pipeline is 0.25-0.

5.

3. The gas-solids fuel, simultaneous combustion capable, flameless combustor of claim 1 wherein: The ratio of the outlet area of the first oxidant pipeline of the solid combustion nozzle to the outlet area of a single solid fuel pipeline is 3-5.

4. The gas-solids fuel self-sustaining combustor of claim 1 wherein: The ratio of the cross-sectional area of the recirculated flue gas pipeline to the cross-sectional area of the end of the solid fuel channel away from the divergent cavity is 0.8-1.

2.

5. The gas-solids fuel self-sustaining combustor of claim 1 wherein: The gas combustion nozzle further comprises a gas fuel pipeline bluff body, an oxidant pipeline bluff body and a lifting bluff body; a receiving space is formed between the oxidant pipeline and the gas fuel pipeline, and the receiving space is used to accommodate the lifting bluff body; the oxidant pipeline bluff body and the gas fuel pipeline bluff body are respectively arranged in the oxidant pipeline and the gas fuel pipeline.

6. The gas-solids fuel self-sustaining combustor of claim 1 wherein: The length of the oxidant pipeline and the gas fuel pipeline is less than the length of the cylindrical cavity, so that one end of the cylindrical cavity forms a premixing chamber.

7. The gas-solids fuel self-sustaining combustor of claim 6 wherein: ​ 8. The gas-solids fuel self-sustaining combustor of claim 7 wherein: The gas combustion nozzle further comprises a fuel side branch and an oxidant side branch, the lifting body is arranged between the oxidant pipeline and the gas fuel pipeline, and two body branch sliding tracks are formed in the lifting body; the fuel side branch and the oxidant side branch are both substantially L-shaped, one end of each of the fuel side branch and the oxidant side branch is connected to the gas fuel pipeline body and the oxidant pipeline body in sequence by penetrating through the closed end and the body branch sliding tracks and the gas fuel pipeline or the oxidant pipeline, and the fuel side branch and the oxidant side branch are movably connected to the two body branch sliding tracks respectively.

9. The gas-solids fuel self-sustaining combustor of claim 8 wherein: The closed end is further provided with a driver, the fuel side branch and the oxidant side branch are connected to the driver respectively, the driver is used to drive the lifting body, the oxidant pipeline body and the gas fuel pipeline body to move along the axial direction of the cylindrical cavity together, so as to adjust the premixing state of the gas fuel and the oxidant; the fuel side branch and the oxidant side branch are driven to move radially by sliding in the two body branch sliding tracks, and then the gas fuel pipeline body and the oxidant pipeline body are driven to move radially, so as to change the opening degree of the gas fuel pipeline and the oxidant pipeline.

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