Hydrogen burner

Abstract

The invention provides a hydrogen burner which comprises a hydrogen fuel interface flange connected into a hydrogen fuel source, the hydrogen fuel interface flange communicates with a hydrogen distribution cavity through a primary hydrogen fuel pipeline, and a primary hydrogen fuel port and a secondary hydrogen fuel pipeline are connected to the hydrogen distribution cavity; the ignition gun is inserted into the low-temperature outer sleeve and the high-temperature outer sleeve through the overhaul flange and is provided with a flame outlet hole and an ignition gun wind shield, and the nitrogen pipeline is inserted into the low-temperature outer sleeve, the high-temperature outer sleeve and other structures through overhaul flange holes; the combustor has the advantages that through disturbance of the arranged rotational flow disc to fresh air and hydrogen fuel combustion flames and guide of the outlet of the trumpet-shaped fire pipe and the outlet tangential angle of the designed secondary fuel pipe in the outward 45-degree direction, the combustion secondary flames are diffused to the periphery of a hearth, the length of the hydrogen flames with the high flow speed is shortened, and the combustion efficiency is improved. Diffusivity of fuel combustion of the secondary fuel pipe is achieved, flame is prevented from combusting at the tail of a hearth to generate high temperature, and safe and stable operation of the boiler is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of burners, and in particular relates to a hydrogen burner. Background Art

[0002] Hydrogen is a clean energy source, but it also has some inherent characteristics. It has a fast burning speed of 170m / s and is easy to backfire (natural gas is 34m / s). The ignition point of hydrogen is 570℃, and the explosion limit range is large, 4-75% is easy to explode (natural gas: 5-15%). In addition, there is more water vapor after hydrogen combustion; the calorific value is relatively low, and the equivalent combustion temperature of hydrogen in the air is 1430℃. In the process of hydrogen combustion, although the ignition point of hydrogen is relatively high, the ignition ability is very small, so it is easy to ignite. In addition, the density of hydrogen is very small, and the flame propagation speed is fast. It is difficult to ensure that hydrogen and oxygen in the air are fully mixed with a burner of general structure. Hydrogen, carried by the airflow, quickly flows to the bottom or outlet of the furnace before it is completely burned. In addition, the flame of hydrogen is very long when it burns, causing the combustion flame to burn in the middle and rear part of the furnace, causing the flue gas outlet temperature to be too high, which is easy to burn the heating surface at the rear of the boiler, resulting in a decrease in the life of the boiler.

[0003] For example, in the already disclosed patent documents, the patent application number "CN202311535070.2" discloses an anti-backfire hydrogen nozzle and a hydrogen burner, including a nozzle assembly, which is used to be connected to the ignition end of the hydrogen burner, and the nozzle assembly includes a protective tube, a storage groove is provided at the top of the protective tube, a flame-spraying component is inserted into the storage groove, an external expansion groove is provided at the bottom of the protective tube, the bottom end of the flame-spraying component is through-connected with the inside of the external expansion groove, and the top of the flame-spraying component is through-connected with the ignition end of the hydrogen burner; a hydrogen burner, the hydrogen burner includes a cylinder, a mounting plate is fixed to the top of the cylinder, a protective cylinder is inserted into the bottom of the cylinder, a sleeve is threadedly sleeved on the outer wall of the bottom end of the cylinder, and a first air inlet pipe, a second air inlet pipe and an igniter are through-connected to the side wall of the cylinder.

[0004] For another example, Chinese utility model patent application No. 202221207306.0 discloses a hydrogen burner, comprising a combustion box and a hydrogen supply pipe arranged in the combustion box, the combustion box being provided with a combustion pipe with openings at both ends, and the outlet end of the hydrogen supply pipe being located in the combustion pipe; the side wall of the combustion box being provided with an air inlet connected to the combustion pipe, the combustion box being provided with a reflux assembly for reflow of post-combustion gas, the air inlet end of the reflux assembly being connected to the top opening of the combustion pipe, and the air outlet end of the reflux assembly being connected to the side of the combustion pipe.

[0005] For another example, utility model patent application No. 202121758803.5 discloses a low-nitrogen hydrogen burner with stable combustion, comprising: an outer air channel; a central wind channel, located in the outer air channel; a gas and flue gas mixing gun, located at the second end of the outer air channel, away from the side of the first end of the outer air channel and the outside of the central wind channel; an outer gas spray gun, located in the outer air channel, one end of which is inserted into the gas and flue gas mixing gun, and the other end extends to the first end of the outer air channel; a stabilizing device, which is stuck in the central wind channel; a central gas channel, located in the central wind channel; a middle-layer gas spray gun, located in the central wind channel and located on the outside of the central gas channel.

[0006] The existing technologies introduced above all have the problem that during the combustion of hydrogen, the flue gas outlet temperature is too high, which can easily burn the heating surface at the rear of the boiler and significantly reduce the life of the boiler. In addition, hydrogen burns quickly and there is a risk of deflagration without innovative technical improvements. Summary of the invention

[0007] The purpose of the present invention is to provide a hydrogen burner to solve the above technical problems, improve the combustion utilization of hydrogen, and achieve energy-saving and environmentally friendly combustion goals.

[0008] The hydrogen burner comprises: a hydrogen fuel interface flange connected to a hydrogen fuel source, the hydrogen fuel interface flange is connected to a hydrogen distribution chamber through a primary hydrogen fuel pipeline, a primary hydrogen fuel port and a secondary hydrogen fuel pipe are respectively connected to the hydrogen distribution chamber to respectively transport hydrogen to a low-temperature jacket and a high-temperature jacket connected to the low-temperature jacket; an ignition gun is inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange to ignite the hydrogen entering the low-temperature jacket and the high-temperature jacket, the ignition gun is provided with a flame outlet hole and an ignition gun wind shield to facilitate the ignition gun to ignite the hydrogen in the secondary hydrogen fuel pipe; a nitrogen pipeline is welded and fixed to the inspection flange, the nitrogen pipeline is inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange hole to transport nitrogen to the low-temperature jacket and the high-temperature jacket, the nitrogen pipeline is fixed to the inspection flange by welding, and is provided The nitrogen pipeline utilizes the inertness of nitrogen to carry out nitrogen replacement after purging the front and back of the boiler furnace when starting and stopping the furnace, so as to avoid the generation of high-concentration hydrogen stagnant in the furnace and ensure the safety of equipment and operation; the fire observation hole and the flame detector are inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange, the fire observation hole observes the hydrogen combustion status of the low-temperature jacket and the high-temperature jacket, and the flame detector is used to detect the flame combustion status in the low-temperature jacket and the high-temperature jacket; the low-temperature jacket is supported on the combustion-supporting fresh air duct, and the low-temperature jacket is fixedly connected to the inspection flange by bolts, and the combustion-supporting fresh air enters the low-temperature jacket through the fresh air vents provided on the combustion-supporting fresh air duct, and the high-temperature jackets are connected to the low-temperature jackets, and the high-temperature combustion gas is discharged through the trumpet-shaped fire tube outlet connected to the high-temperature jacket, and the swirl disk is fixed to the secondary hydrogen fuel pipe.

[0009] Furthermore, a partition is arranged between the air inlet bracket and the low-temperature jacket, and a plurality of the fresh air vents are evenly arranged on the partition.

[0010] Furthermore, the ignition gun outlet is provided with an ignition gun flame outlet hole and an ignition gun wind shield to facilitate ignition of the gas flame of the secondary hydrogen fuel pipeline.

[0011] Furthermore, the ignition gun is arranged close to the inner side of the swirl disk so that the flame of the ignition gun is located at a position that can easily ignite the hydrogen fuel from the hydrogen fuel pipeline and the hydrogen fuel from the secondary hydrogen fuel pipeline.

[0012] Furthermore, the swirl blades of the swirl disk are designed to have an angle of 20-40 degrees to disturb the fresh air and the hydrogen fuel combustion flame.

[0013] Furthermore, the swirl blades of the swirl disk are designed to be at an angle of 30 degrees to disturb the fresh air and the hydrogen fuel combustion flame.

[0014] Furthermore, the front end of the swirl disk is arranged to be 5-15 mm away from the center of the primary hydrogen fuel port.

[0015] Furthermore, the front end of the swirl disk is arranged to be 10 mm away from the center of the primary hydrogen fuel port.

[0016] Furthermore, the two flame observation holes are symmetrically arranged on the inspection flange to facilitate observation of the flame status of the hydrogen burner.

[0017] Furthermore, the outlet cut angle 8 of the trumpet-shaped fire tube outlet 6 and the designed secondary fuel tube 7 is 45 degrees outward.

[0018] The advantages and effects of the hydrogen burner of the present invention are:

[0019] 1. The swirl disk is set to disturb the combustion flames of fresh air and hydrogen fuel, and the trumpet-shaped fire tube outlet and the outlet angle of the designed secondary fuel pipe are guided outward at 45 degrees, so that the burning secondary flame is diffused to the surrounding of the furnace, shortening the length of the fast-flowing hydrogen flame, realizing the diffusion of the fuel combustion in the secondary fuel pipe, avoiding the flame from burning at the tail of the furnace to generate high temperature, and ensuring the safe and stable operation of the boiler.

[0020] 2. The ignition gun is fixed on the inspection flange and passes through the low-temperature jacket and the high-temperature jacket in parallel. The outlet is designed with an ignition gun flame outlet hole and an ignition gun wind shield. This design facilitates the establishment of a branch ignition gun flame. The ignition gun length is designed to the inside of the swirl disk, and the ignition gun flame is located at a position that is easy to ignite the primary hydrogen fuel and the secondary hydrogen fuel, which is very conducive to quickly igniting the hydrogen fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the hydrogen burner of the present invention;

[0022] Figure 2 yes Figure 1 AA section structure schematic diagram in;

[0023] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure rotated 90 degrees clockwise;

[0024] Figure 4 It is a schematic diagram of the internal structure of the hydrogen burner of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the combustion-supporting fresh air duct of the hydrogen burner of the present invention;

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the high-temperature jacket of the hydrogen burner of the present invention being connected to the trumpet-shaped fire tube outlet.

[0027] As shown in the figure:

[0028] 1. Hydrogen fuel interface flange; 2. Primary hydrogen fuel pipeline; 3. Hydrogen distribution chamber; 4. Low-temperature jacket; 5. High-temperature jacket; 6. Trumpet-shaped fire tube outlet; 7. Secondary hydrogen fuel pipeline; 8. Secondary fuel pipe outlet cut-off angle; 9. Swirl disk; 10. Ignition gun; 11. Nitrogen pipeline; 12. Inspection flange; 13. Combustion-supporting fresh air pipeline; 14. Fresh air vent; 15. Primary hydrogen fuel port; 16. Flame detector; 17. Fire viewing hole; 18. Ignition gun flame outlet; 19. Ignition gun windshield. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1-6As shown, the hydrogen burner includes: a hydrogen fuel interface flange 1 connected to a hydrogen fuel source, the hydrogen fuel interface flange 1 is connected to a hydrogen distribution chamber 3 through a primary hydrogen fuel pipeline 2, a primary hydrogen fuel port 15 and a secondary hydrogen fuel pipe 7 are respectively connected to the hydrogen distribution chamber 3 to respectively deliver hydrogen to a low-temperature jacket 4 and a high-temperature jacket 5 connected to the low-temperature jacket 4; an ignition gun 10 is inserted into the low-temperature jacket 4 and the high-temperature jacket 5 through an inspection flange 12 to ignite the hydrogen entering the low-temperature jacket 4 and the high-temperature jacket 5, the ignition gun 10 is provided with a flame outlet 18 and an ignition gun windshield 19 to facilitate the ignition gun 10 to ignite the hydrogen in the secondary hydrogen fuel pipe 8; a nitrogen pipeline 11 is welded and fixed to the inspection flange 12, inserted into the low-temperature jacket 4 and the high-temperature jacket 5 through the inspection flange 12, and delivers nitrogen to the low-temperature jacket 4 and the high-temperature jacket 5. The nitrogen pipeline 11 is provided, and can utilize the inertness of nitrogen when starting and stopping the furnace. It is capable of replacing the nitrogen after the front and back purging of the boiler furnace, avoiding the generation of high concentration of retained hydrogen in the furnace, and ensuring the safety of equipment and operation; the fire observation hole 17 and the flame detector 16 are inserted into the low-temperature jacket 4 and the high-temperature jacket 5 through the inspection flange 12, the fire observation hole 17 observes the hydrogen combustion status of the low-temperature jacket 4 and the high-temperature jacket 5, and the flame detector 16 is used to detect the flame combustion status in the low-temperature jacket 4 and the high-temperature jacket 5; the low-temperature jacket 4 is supported on the combustion-supporting fresh air duct 13, the low-temperature jacket 4 is fixedly connected to the inspection flange 12 by bolts, the combustion-supporting fresh air enters the low-temperature jacket 4 through the fresh air vent 14 provided on the combustion-supporting fresh air duct 13, the high-temperature jacket 5 is connected to the low-temperature jacket 4, the low-temperature jacket 4 is a hydrogen low-temperature combustion chamber, the high-temperature jacket 5 is a hydrogen high-temperature combustion chamber, the high-temperature combustion gas is discharged through the trumpet-shaped fire tube outlet 6 connected to the high-temperature jacket 5, and the swirl disk 9 is fixed to the secondary hydrogen fuel pipe 7.

[0031] As a specific embodiment, a partition is arranged between the air inlet bracket 13 and the low-temperature jacket 4, and a plurality of the fresh air vents 14 are evenly arranged on the partition.

[0032] As a specific embodiment, the outlet of the ignition gun 10 is provided with an ignition gun flame outlet 18 and an ignition gun wind shield 19 to facilitate the establishment of a branch ignition gun 10 flame.

[0033] As a specific example, Figure 4 As shown, the ignition gun 10 is arranged close to the inner side of the swirl disk 9 so that the flame of the ignition gun 10 is located at a position that can easily ignite the hydrogen fuel from the hydrogen fuel pipeline 2 and the hydrogen fuel from the secondary hydrogen fuel pipeline 7.

[0034] As a specific embodiment, the swirl blades of the swirl disk 9 are designed to have an angle of 20-40 degrees to disturb the fresh air and the hydrogen fuel combustion flame.

[0035] As a specific embodiment, the swirl blades of the swirl disk 9 are designed to be at an angle of 30 degrees to disturb the fresh air and the hydrogen fuel combustion flame.

[0036] As a specific example, Figure 4 As shown, the front end of the swirl disk 9 is arranged to be 5-15 mm away from the center of the primary hydrogen fuel port 15.

[0037] As a specific example, Figure 4 As shown, the front end of the swirl disk 9 is arranged to be 10 mm away from the center of the primary hydrogen fuel port 15.

[0038] As a specific embodiment, the flame observation holes 17 are symmetrically arranged on the inspection flange 12 to facilitate observation of the flame state of the hydrogen burner.

[0039] As a specific embodiment, the trumpet-shaped fire tube outlet 6 and the outlet cut angle 8 of the secondary fuel tube 7 are designed to be 45 degrees outward.

[0040] The working principle of the hydrogen burner described in the present invention is described as follows:

[0041] The hydrogen fuel source enters the distribution 3 through the hydrogen fuel interface flange 1 under the action of the hydrogen source pressure, and then is ejected from the primary hydrogen fuel port 15 and the secondary fuel pipe outlet 8 set in the distribution chamber 3. When the ignition gun 10 is ignited, the primary hydrogen fuel from the primary hydrogen fuel pipeline 2 and the secondary hydrogen fuel from the secondary hydrogen fuel pipeline 7 are ignited. Under the disturbance of the fresh air and the hydrogen fuel combustion flame by the swirl disk 9, and the 45-degree outward guidance of the trumpet-shaped fire tube outlet 6 and the outlet cut angle 8 of the secondary fuel pipe 7, the burning secondary flame is diffused to the surrounding of the furnace, shortening the length of the fast-flowing hydrogen flame, realizing the diffusibility of the secondary fuel pipe fuel combustion, avoiding the flame burning at the tail of the furnace to generate high temperature, ensuring the safe and stable operation of the boiler, and ensuring the service life of the boiler.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and concepts of the present invention, and that all such changes, modifications, substitutions and variations will fall within the scope of protection of the claims appended hereto.

Claims

1. A hydrogen burner, characterized in that: The hydrogen burner comprises: a hydrogen fuel interface flange connected to a hydrogen fuel source, the hydrogen fuel interface flange is connected to a hydrogen distribution chamber through a primary hydrogen fuel pipeline, a primary hydrogen fuel port and a secondary hydrogen fuel pipe are respectively connected to the hydrogen distribution chamber to respectively transport hydrogen to a low-temperature jacket and a high-temperature jacket connected to the low-temperature jacket; an ignition gun is inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange to ignite hydrogen entering the low-temperature jacket and the high-temperature jacket, and the ignition gun is provided with a flame outlet and an ignition gun wind shield; a nitrogen pipeline is welded and fixed to the inspection flange, and the nitrogen pipeline is inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange hole. Nitrogen is transported to the low-temperature jacket and the high-temperature jacket, and the nitrogen pipeline is fixed to the inspection flange by welding; the fire viewing hole and the flame detector are inserted into the low-temperature jacket and the high-temperature jacket through the inspection flange; the flame detector is used to detect the flame combustion conditions in the low-temperature jacket and the high-temperature jacket; the low-temperature jacket is supported on the combustion-supporting fresh air duct, and the low-temperature jacket is fixedly connected to the inspection flange by bolts, and the combustion-supporting fresh air enters the low-temperature jacket through the fresh air vents set on the combustion-supporting fresh air duct, and the high-temperature jackets are connected to the low-temperature jackets, and the high-temperature combustion gas is discharged through the trumpet-shaped fire tube outlet connected to the high-temperature jacket, and the swirl disk is fixed to the secondary hydrogen fuel pipe.

2. The hydrogen burner according to claim 1, characterized in that: A partition is arranged between the air inlet bracket and the low-temperature jacket, and a plurality of fresh air vents are evenly arranged on the partition.

3. The hydrogen burner according to claim 1, characterized in that: The ignition gun outlet is provided with an ignition gun flame outlet hole and an ignition gun wind shield.

4. The hydrogen burner according to claim 1, characterized in that: The ignition gun is arranged close to the inner side of the swirl disk.

5. The hydrogen burner according to claim 1, characterized in that: The swirl plates of the swirl disk are designed to have an angle of 20-40 degrees.

6. The hydrogen burner according to claim 1, characterized in that: The swirl plates of the swirl disk are designed to have an angle of 30 degrees.

7. The hydrogen burner according to claim 1, characterized in that: The front end of the swirl disk is arranged to be 5-15 mm away from the center of the primary hydrogen fuel port.

8. The hydrogen burner according to claim 1, characterized in that: The front end of the swirl disk is arranged to be 10 mm away from the center of the primary hydrogen fuel port.

9. The hydrogen burner according to claim 1, characterized in that: Furthermore, the two fire viewing holes are symmetrically arranged on the inspection flange.

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