A stable flame burner for hydrogen-doped fuel gas and a hydrogen-doped fuel gas staged combustion method

Abstract

The present application relates to the technical field of gas combustion, in particular to a stable flame burner for hydrogen-doped gas and a hydrogen-doped gas staged combustion method. The stable flame burner for hydrogen-doped gas firstly guides the gas jet to the top-closed primary combustion chamber for stable flame; secondly, the primary combustion air is inhaled through the primary combustion air hole in the side wall of the chamber for preliminary combustion; finally, the gas impacts the outer inclined guide plate and injects secondary air, forming a long flame outside the guide plate for complete combustion; the stable flame burner is provided with a stable flame cover above the fire cover, the plate integrally integrates the top-closed primary combustion chamber and the inclined guide plate with the secondary air distribution window; through staged combustion and airflow guiding, the problems of shortening of hydrogen-doped gas flame, easy over-standard of CO and reduction of heat exchange efficiency are effectively solved, and the structure is compact and convenient to transform.

Description

Technical Field

[0001] This invention relates to the field of gas combustion technology, specifically to a flame stabilizer burner for hydrogen-blended gas and a staged combustion method for hydrogen-blended gas. Background Technology

[0002] In the energy sector, blending hydrogen into natural gas is an important way to achieve carbon emission reduction. However, hydrogen has a much higher flame propagation speed than natural gas. When hydrogen-blended gas is burned in a conventional atmospheric burner, the flame morphology changes significantly, specifically manifested as a sharp shortening of flame length and an increased risk of backfire. The shorter flame cannot fully reach the heat exchanger surface, leading to a decrease in the thermal efficiency of equipment such as heating boilers. At the same time, simple structural modifications made to lengthen the flame can easily disrupt the air-fuel mixture, resulting in incomplete combustion and excessive carbon monoxide (CO) emissions. Current technology lacks an integrated solution that can systematically address both flame morphology and combustion incompleteness simultaneously.

[0003] The utility model patent "Adaptable hydrogen-blended natural gas water heater burner" with patent publication number CN 222634565 U designs multiple outlets at the injector outlet of the burner burner, realizing the adjustment of the flame hole area and flame hole height, and realizing the adjustment of the injector inlet area through the baffle plate. The invention point of this patent is below the burner burner burner cap, and there is no related invention of graded flame stabilization combustion.

[0004] Therefore, it is urgent to improve the structure and combustion method of existing burners, especially those suitable for hydrogen-blended gas. Summary of the Invention

[0005] The purpose of this invention is to provide a flame stabilizer for hydrogen-blended gas, which addresses the technical deficiencies of existing solutions and effectively solves the problems of shortened flame, potentially increased CO emissions, and reduced thermal efficiency associated with hydrogen-blended gas.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A flame stabilizer burner for hydrogen-blended fuel gas includes:

[0008] The burner body is used to conduct premixed gas, which is a mixture of hydrogen-blended fuel gas and air;

[0009] The fire cover is located on the top of the fire plate body, and multiple fire holes are provided in the fire cover.

[0010] The flame stabilizer is fixed to the top of the flame cap by the support feet at the bottom. The flame stabilizer is equipped with a primary combustion chamber, and the premixed gas is injected upward into the primary combustion chamber from the flame hole.

[0011] The flame stabilizer has secondary combustion guide vanes and primary combustion air holes on both sides. The secondary combustion guide vanes are used to combust unburned gases flowing out of the primary combustion chamber, and the secondary combustion guide vanes are equipped with secondary air supply windows;

[0012] The primary combustion air vent is located on the lower side of the secondary combustion air guide vane.

[0013] The above technical solution produces the following technical effects:

[0014] This application, for the first time, organically and sequentially integrates the three physical processes of "jet-constrained flame stabilization," "lateral staged air supply," and "guided jet combustion" into a solution for a flame-stabilized burner used for hydrogen-blended fuel gas through a specific structural combination of "primary combustion chamber - primary combustion air orifice - secondary combustion guide vane." These three processes coordinate with each other. The flame stabilization effect of the primary combustion chamber provides a stable foundation for subsequent staged combustion; its specific outflow pattern greatly enhances the secondary air entrainment capability of the guide vane; and sufficient secondary air supply ensures that unburned products exiting the flame stabilization chamber are completely burned, thereby controlling CO emissions while prolonging the flame.

[0015] As a further improvement to the flame stabilizer burner for a hydrogen-blended gas-fired heating hot water boiler of this application, the top of the flame stabilizer cover has a closed structure.

[0016] As a further improvement to the flame stabilizer burner for a hydrogen-blended gas-fired heating hot water boiler of this application, the burner body and the burner cap are cast from high-temperature resistant stainless steel, and the burner cap is provided with multiple sets of fire holes along its length.

[0017] As a further improvement to the flame stabilizer burner for a hydrogen-blended gas-fired heating hot water boiler of this application, the flame stabilizer shroud extends on both sides of the primary combustion chamber and is provided with inclined secondary combustion guide vanes, the angle α between the plate surface of the secondary combustion guide vanes and the horizontal plane being 120°-150°.

[0018] As a further improvement to the flame stabilizer burner for a hydrogen-doped gas-fired heating hot water boiler of this application, the ratio of the total flow area S1 of the primary combustion air holes to the total flow area S0 of the flame holes, S1 / S0, is in the range of 0.8-1.5.

[0019] As a further improvement to the flame stabilizer burner for a hydrogen-doped gas-fired heating hot water boiler of this application, the ratio of the total flow area S2 of the secondary air supply window to the total flow area S1 of the primary combustion air hole, S2 / S1, is within the range of 1.5-3.0.

[0020] As a further improvement to the flame-stabilizing burner for a hydrogen-blended gas-fired heating hot water boiler of this application, a vortex generating structure is provided on the inner wall of the top of the primary combustion chamber.

[0021] As a further improvement to the flame stabilizer burner for a hydrogen-blended gas-fired heating hot water boiler of this application, the flame stabilizer cover is integrally formed with a primary combustion chamber, the primary combustion chamber having an inverted U-shaped cross-section.

[0022] As a further improvement to the flame stabilizer burner for a hydrogen-blended gas-fired heating hot water boiler of this application, the support feet are arranged at certain intervals under the two outermost long sides of the bottom of the flame stabilizer cover.

[0023] A method for staged combustion of hydrogen-blended fuel gas in a flame stabilizer as described above includes the following steps:

[0024] S1: The premixed gas of hydrogen-infused fuel and air is injected vertically upward through the flame holes in the burner head through the burner body, so that it directly enters the primary combustion chamber of the flame stabilizer.

[0025] S2: The primary combustion air holes set on both sides of the flame stabilizer draw in primary combustion air from the surrounding environment of the flame stabilizer through the primary combustion chamber by relying on the negative pressure generated by combustion. The primary combustion air is initially mixed with the flame root region of the rising gas flow in the primary combustion chamber.

[0026] S3: The unburned gas flowing out from both sides of the primary combustion chamber impacts the secondary combustion guide vanes fixed on both sides of the primary combustion chamber. The secondary combustion guide vanes draw in secondary air through the secondary air distribution window by means of airflow ejection.

[0027] S4: In the space outside the secondary combustion guide vane, the unburned gas is mixed with the secondary air and combustion is completed. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the fire duct and flame stabilizer of the present invention.

[0029] Figure 2 This is a cross-sectional view of the flame stabilizer of the present invention.

[0030] Figure 3 This is a side view of the flame stabilizer of the present invention.

[0031] Figure 4 This is a flowchart illustrating the process of the hydrogen-infused gas staged combustion method for the flame stabilizer burner of this invention.

[0032] in:

[0033] 1-Fire row body;

[0034] 2-Fire cap;

[0035] 3-Fire hole;

[0036] 4-Flame stabilizer;

[0037] 401 - Primary combustion chamber;

[0038] 402 - Secondary combustion guide vane;

[0039] 5 – Primary combustion air port;

[0040] 6 - Secondary air supply window;

[0041] 7 – Eddy current generating structure;

[0042] 8 - Support feet;

[0043] α - Deflector tilt angle. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] To facilitate an accurate understanding of the solutions provided in the following embodiments of the present invention, the terms involved in the present invention will be explained as follows before describing the technical solutions provided by the present invention:

[0046] Hydrogen-blended gas: refers to a mixture of natural gas and hydrogen, which aims to reduce carbon emissions. However, due to the high flame propagation speed of hydrogen, it can easily lead to shortened flames in traditional burners, increased risk of backfire, and excessive CO emissions.

[0047] Burner body 1: The main structure of the long strip burner, with a burner cap 2 on the top. The interior can be designed with a gradually narrowing flow channel to increase the gas outlet flow rate and enhance the backfire prevention capability.

[0048] Flame cap 2: A component at the top of the flame pack body 1, with multiple sets of flame holes 3 along its length for injecting hydrogen-blended fuel gas-air premixed gas.

[0049] Venturi effect: The phenomenon that the flow velocity increases and the pressure decreases when a fluid flows through a narrow channel. The secondary air distribution window 6 utilizes this effect to efficiently draw in secondary air.

[0050] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0051] Example 1

[0052] It is known that the technical defects of existing solutions lie in the fact that when hydrogen-blended gas is burned in a conventional burner, the flame propagation speed of hydrogen is much higher than that of natural gas, resulting in a shorter residence time of the flame at the burner outlet. This directly leads to a shorter flame length, making it difficult to stabilize on the burner surface and increasing the risk of backfire. Simultaneously, the shortened flame also results in incomplete combustion, especially in the central region of the burner, easily generating localized high temperatures and an oxygen-deficient environment, promoting the formation of incomplete combustion products such as carbon monoxide (CO), leading to excessive emissions. Furthermore, the design of conventional burners does not fully consider the characteristics of hydrogen-blended gas; their flow channel structure, burner hole layout, and air supply methods are all ill-suited to the high reactivity of hydrogen, further exacerbating the aforementioned problems. Therefore, this application presents a flame-stabilizing burner designed for hydrogen-blended gas, addressing the above-mentioned technical defects through staged combustion.

[0053] Specifically, such as Figure 1-3 As shown, the technical solution of this application is: a flame stabilizer burner for a hydrogen-blended gas heating hot water boiler, comprising: a burner body 1 for conducting premixed gas; a burner cap 2 disposed on the top of the burner body 1, the burner cap 2 having multiple burner holes 3; a flame stabilizer 4, the flame stabilizer 4 being fixed to the top of the burner cap 2 by support feet 8 at the bottom, the flame stabilizer 4 having a primary combustion chamber 401 disposed inside, the premixed gas being injected upward into the primary combustion chamber 401 through the burner holes 3; secondary combustion guide vanes 402 and primary combustion air holes 5 disposed on both sides of the flame stabilizer 4, the secondary combustion guide vanes 402 being used to burn unburned gas flowing out of the primary combustion chamber 401, the secondary combustion guide vanes 402 having secondary air supply windows 6, wherein the primary combustion air holes 5 are disposed on the lower side of the secondary combustion guide vanes 402. Furthermore, the multiple primary combustion air holes 5 form an array of primary combustion air holes 5.

[0054] Furthermore, the working principle of this application's technical solution is as follows: Hydrogen-blended fuel gas and air premixed gas are vertically injected upwards from the flame holes 3 of the burner cap 2, entering the primary combustion chamber 401 formed by the flame stabilizer 4, the burner cap 2, and the flame holes 3. Within the chamber, the high-speed jet is blocked by the top sealing structure, forming a high-temperature recirculation zone to stabilize the flame and prevent flame shortening and drifting. Subsequently, the primary combustion air hole array at the lower part of both side walls of the combustion chamber draws in air, which is initially mixed and burned with the fuel-rich fuel gas flow at the flame edge. Unburned gas flows out from both sides of the primary combustion chamber 401, impacting the outwardly and downwardly inclined secondary combustion guide vanes 402. The secondary air distribution windows 6 on the guide vanes utilize the Venturi effect to draw in secondary air, ultimately achieving thorough mixing and complete combustion in the space outside the guide vanes, forming a long flame extending towards the heat exchanger. In addition, the tapered flow channel within the burner body 1 can increase the fuel gas outlet velocity.

[0055] Furthermore, in this embodiment, the burner body 1 and the burner cap 2 are cast from high-temperature resistant stainless steel. This high-temperature resistant stainless steel material has excellent resistance to high-temperature oxidation and can maintain stable physical and chemical properties under long-term high-temperature combustion environment. It is not prone to deformation or damage, effectively extending the service life of the burner body 1 and the burner cap 2.

[0056] Furthermore, the burner cap 2 has multiple sets of burner holes 3 along its length. The design of multiple sets of burner holes 3 allows the gas to be distributed more evenly, thereby ensuring the completeness and stability of combustion.

[0057] Furthermore, the flame stabilizer 4 extends inclined secondary combustion guide vanes 402 on both sides of the primary combustion chamber 401, with the angle α between the surface of the secondary combustion guide vanes 402 and the horizontal plane being 120°-150°. In specific implementation, the angle α between the surface of the secondary combustion guide vanes 402 and the horizontal plane is preferably α=135°, and the secondary combustion guide vanes 402 also have secondary air supply windows 6. Specifically, the secondary combustion guide vanes 402 extend outward and tilt downward on both sides of the primary combustion chamber 401 of the flame stabilizer 4, and by setting the angle α between the surface of the secondary combustion guide vanes 402 and the horizontal plane to 120°-150°, especially when α=135°, the incompletely combusted gas and high-temperature flue gas flowing out from both sides of the primary combustion chamber 401 impact the surface of the secondary combustion guide vanes 402 at a certain angle. At the same time, secondary air supply windows 6 are provided on the secondary combustion guide vanes 402. When the high-speed airflow passes over the surface of the secondary combustion guide vane 402, a Venturi effect is generated at the secondary air supply window 6, automatically and efficiently drawing in a sufficient amount of secondary air. This process realizes the "airflow guidance and secondary air injection" steps in staged combustion.

[0058] Furthermore, a vortex generating structure 7 is provided on the inner top wall of the primary combustion chamber 401. Specifically, this application incorporates fins as the vortex generating structure 7 on the enclosed inner top wall of the primary combustion chamber 401. When the hydrogen-doped fuel gas-air premixed gas enters the primary combustion chamber 401, the airflow rotates under the action of the fins, forming a vortex. This vortex enhances the intensity of the high-temperature recirculation zone, allowing the flame to adhere more stably within the primary combustion chamber 401, further preventing flame shortening and floating. Moreover, the presence of the vortex promotes thorough mixing of the premixed gas within the primary combustion chamber 401, improving combustion efficiency and reducing the generation of incomplete combustion products. Preferably, a tapered flow channel is formed within the burner body 1 to increase the fuel gas outlet velocity and enhance backfire prevention.

[0059] Furthermore, the ratio of the total flow area S1 of the primary combustion air orifice 5 to the total flow area S0 of the flame orifice 3, S1 / S0, is within the range of 0.8-1.5. By rationally setting the ratio of the total flow area of ​​the primary combustion air orifice 5 to the total flow area of ​​the flame orifice 3, the amount of air entering the combustion zone can be precisely controlled, ensuring that the mixing ratio of hydrogen-blended fuel gas and air reaches the optimal state. Within this ratio range, it is possible to ensure complete combustion of the hydrogen-blended fuel gas, releasing sufficient heat, while effectively avoiding problems such as unstable combustion and flame extinction caused by excessive or insufficient air volume, thereby further improving the flame stability performance and combustion efficiency of the burner.

[0060] Furthermore, the ratio S2 / S1 of the total flow area S2 of the secondary air supply window 6 to the total flow area S1 of the primary combustion air orifice 5 is within the range of 1.5-3.0. By rationally setting the ratio of the total flow area of ​​the secondary air supply window 6 to the total flow area of ​​the primary combustion air orifice 5, the air supply during the combustion process can be further optimized. Within this ratio range, secondary air can be supplied to the combustion zone more precisely, providing sufficient oxygen for combustion and ensuring that the hydrogen-blended fuel gas can burn more completely, further improving combustion efficiency. At the same time, this ratio setting can also effectively adjust the flame shape and temperature distribution, making the flame more stable and avoiding local overheating or incomplete combustion, thereby enhancing the overall performance and reliability of the flame stabilizer burner.

[0061] Furthermore, the flame stabilizer 4 is integrally formed with a primary combustion chamber 401, the primary combustion chamber 401 having an inverted U-shaped cross-section. Support legs 8 are distributed at certain intervals under the two outermost long sides of the bottom of the flame stabilizer 4. In specific implementation, the support legs 8 are distributed at certain intervals along the length of the flame stabilizer 4 on its two outermost long sides. Simultaneously, there are also one or two support legs 8 on each of its two short sides. The flame stabilizer 4 is fixed by welding the support legs 8 to the flame cap 2. When the hydrogen-blended fuel gas-air premixed gas is injected vertically upwards from the flame hole 3, it is directly guided into the primary combustion chamber 401.

[0062] Example 2

[0063] like Figure 4 As shown, in order to further address the technical deficiencies of the prior art solutions described above, this application designs a staged combustion method for hydrogen-blended gas in a flame stabilizer as described in any of the above-mentioned methods, comprising the following steps:

[0064] S1: The premixed gas of hydrogen-containing fuel gas and air is injected vertically upward through the flame hole 3 in the flame cap 2 through the flame vent body 1, so that it directly enters the primary combustion chamber 401 of the flame stabilizer 4.

[0065] S2: The primary combustion air holes 5 set on both sides of the flame stabilizer 4 draw in primary combustion air from the surrounding environment of the flame stabilizer 4 through the primary combustion chamber 401 by relying on the negative pressure generated by combustion. The primary combustion air is initially mixed with the flame root region of the rising gas flow in the primary combustion chamber 401.

[0066] S3: The unburned gas flowing out from both sides of the primary combustion chamber 401 impacts the secondary combustion guide vanes 402 fixedly installed on both sides of the primary combustion chamber 401. The secondary combustion guide vanes 402 draw in secondary air through the secondary air distribution window 6 by airflow ejection.

[0067] S4: In the space outside the secondary combustion guide wing 402, the unburned gas is mixed with the secondary air and combustion is completed.

[0068] Specifically, in the staged combustion method of hydrogen-blended gas in the flame stabilizer burner of this application:

[0069] First, flame confinement and stabilization are achieved by constructing a primary combustion chamber 401. When the premixed gas (fuel gas and air) is injected vertically upward from the flame hole 3, it is directly guided into the primary combustion chamber 401. The closed top of the primary combustion chamber 401 physically obstructs the high-speed jet, forcing it to decelerate and change direction, converting some of its kinetic energy into eddy current energy, thereby significantly reducing the axial propagation speed of the flame. At the same time, a high-temperature recirculation zone filled with turbulence is formed within the chamber. This zone acts as a stable ignition source, firmly "anchoring" the flame root within the chamber, completing the "guided jet and chamber confinement" step in the staged combustion method, fundamentally preventing the shortening and floating of the hydrogen-doped fuel gas flame.

[0070] Secondly, controllable preliminary combustion is achieved through a primary combustion air orifice array. A primary combustion air orifice array is formed on the lower part of both side walls of the primary combustion chamber 401. The pressure difference inside and outside the primary combustion chamber 401 allows surrounding air to be automatically drawn in through these orifices. The drawn-in primary combustion air does not directly impact the flame core, but mixes and undergoes preliminary combustion with the rising fuel-rich gas stream at the flame edge. This process precisely adjusts the stoichiometric ratio at the flame root, preventing incomplete combustion products due to excessive fuel richness. This constitutes the "primary combustion air supply" step in the staged combustion method, laying a solid foundation for subsequent complete combustion.

[0071] Subsequently, airflow guidance and complete combustion are achieved through the guide vanes and secondary air supply window 6. The flame stabilizer 4 extends outward and downward on both sides of the primary combustion chamber 401 to form outward-facing and downward-sloping secondary combustion guide vanes 402, with the angle α between the surface of the secondary combustion guide vanes 402 and the horizontal plane being 120°~150°. Incompletely burned gases flowing from both sides of the primary combustion chamber 401 impact the surface of the secondary combustion guide vanes 402 at a certain angle. Simultaneously, a secondary air supply window 6 is provided on the secondary combustion guide vanes 402. When the high-speed airflow passes over the surface of the secondary combustion guide vanes 402, a Venturi effect is generated at the secondary air supply window 6, automatically and efficiently drawing in sufficient secondary air. This process realizes the "airflow guidance and secondary air ejection" steps in the staged combustion method.

[0072] Finally, a long flame is formed in the space outside the guide vanes. In the external space opened up by the secondary combustion guide vanes 402, the unburned gas flowing out of the primary combustion chamber 401 undergoes thorough turbulent mixing with the injected secondary air and completes final combustion, thereby forming a fully combusted flame that extends towards the heat exchanger and has a significantly increased length. This completes the "flame formation and complete combustion" steps in the staged combustion method.

[0073] In addition to steps S1-S4 described above, this application also includes:

[0074] Step S5: When primary combustion air is drawn in through primary combustion air hole 5, the stoichiometric ratio is adjusted for preliminary combustion adjustment. Specifically, the opening size of primary combustion air hole 5 is adjusted to control the amount of primary combustion air drawn in, thereby changing the mixing ratio of fuel and air in primary combustion chamber 401, so that the stoichiometric ratio reaches a preliminary suitable range, providing a good foundation for subsequent complete combustion and ensuring a more stable and efficient combustion process.

[0075] In addition, after the complete combustion and flame shaping in step S4, the combustion state is judged to be qualified. If the combustion state is qualified, the current working state of the burner is maintained, so that the flame stabilizer burner continues to operate stably and provides a stable heat source for subsequent equipment such as heat exchangers. If the combustion state is unqualified, such as unstable flame, incomplete combustion producing black smoke, etc., the opening of the secondary air supply window 6 is adjusted to change the intake of secondary air, further optimize the mixing ratio of unburned gas and secondary air, and the complete combustion and flame shaping process in step S4 is repeated until the combustion state meets the qualified standard.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flame stabilizer burner for hydrogen-blended fuel gas, characterized in that, include: The burner body (1) is used to conduct premixed gas, which is a mixture of hydrogen-doped fuel gas and air; A fire cover (2) is provided on the top of the fire plate body (1), and the fire cover (2) is provided with a plurality of fire holes (3); The flame stabilizer (4) is fixed to the top of the flame cap (2) by the support foot (8) at the bottom. The flame stabilizer (4) is provided with a primary combustion chamber (401). The premixed gas is injected upward into the primary combustion chamber (401) from the flame hole (3). The flame stabilizer (4) is provided with secondary combustion guide vanes (402) and primary combustion air holes (5) on both sides. The secondary combustion guide vanes (402) are used to burn the unburned gas flowing out of the primary combustion chamber (401). The secondary combustion guide vanes (402) are provided with secondary air supply windows (6). The primary combustion air hole (5) is located on the lower side of the secondary combustion guide vane (402).

2. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The top of the flame stabilizer (4) is a closed structure.

3. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The fire plate body (1) and the fire cover (2) are made of high temperature resistant stainless steel. The fire cover (2) is provided with multiple sets of fire holes (3) along its length.

4. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The flame stabilizer (4) extends on both sides of the primary combustion chamber (401) and is provided with inclined secondary combustion guide wings (402). The angle α between the plate surface of the secondary combustion guide wings (402) and the horizontal plane is 120°-150°.

5. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The ratio of the total flow area S1 of the primary combustion air hole (5) to the total flow area S0 of the fire hole (3) is in the range of 0.8-1.

5.

6. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The ratio of the total flow area S2 of the secondary air supply window (6) to the total flow area S1 of the primary combustion air hole (5) is in the range of 1.5-3.

0.

7. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, A vortex generating structure (7) is provided on the top inner wall of the primary combustion chamber (401).

8. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The flame stabilizer (4) is integrally formed with the primary combustion chamber (401), and the primary combustion chamber (401) has an inverted U-shaped cross-section.

9. A flame stabilizer burner for hydrogen-blended fuel gas according to claim 1, characterized in that, The support feet (8) are arranged at certain intervals under the two outermost long sides of the bottom of the flame stabilizer (4).

10. A method for staged combustion of hydrogen-blended fuel gas in a flame stabilizer as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: The premixed gas of hydrogen-containing fuel gas and air is injected vertically upward through the flame hole in the flame cap (2) through the flame outlet body (1), so that it directly enters the primary combustion chamber (401) of the flame stabilizer (4); S2: The primary combustion air holes (5) set on both sides of the flame stabilizer (4) draw primary combustion air from the environment around the flame stabilizer (4) through the primary combustion chamber (401) by relying on the negative pressure generated by combustion. The primary combustion air is initially mixed with the flame root region of the rising gas flow in the primary combustion chamber (401). S3: The incompletely combusted gas flowing out from both sides of the primary combustion chamber (401) impacts the secondary combustion guide vanes (402) fixedly installed on both sides of the primary combustion chamber (401). The secondary combustion guide vanes (402) draw in secondary air through the secondary air supply window (6) by airflow ejection. S4: In the outer space of the secondary combustion guide vane (402), the incompletely combusted gas is mixed with the secondary air and combustion is completed.

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