Hydrogen and natural gas co-combustion device

Abstract

The invention provides a hydrogen and natural gas co-combustion device. The hydrogen and natural gas co-combustion device comprises a panel; the gas ring is arranged on the panel and comprises a gas ring hydrogen part and a gas ring natural gas part which are separated from each other and are respectively used for introducing hydrogen and natural gas; the air door part is used for introducing mixed combustion air; the central gas injection part is communicated with the gas ring natural gas part and at least comprises a central gun and a plurality of ring guns; the inner ring gas injection part surrounds the outer side of the central gas injection part and comprises at least one inner ring hydrogen gun and at least one inner ring natural gas gun; the outer ring gas injection part surrounds the outer side of the inner ring gas injection part and comprises at least one outer ring hydrogen gun and at least one outer ring natural gas gun, at least one part of the outer side of the outer ring hydrogen gun is sleeved with an air pipe, and air and natural gas mixing pipes are arranged in front of the outer ring natural gas gun and the inner ring natural gas gun; the mixed combustion air passes through the communicating opening and then is mixed with natural gas sprayed out of the outer-ring natural gas gun or the inner-ring natural gas and then sprayed out, and the spraying distances of the outer-ring gas spraying part and the inner-ring gas spraying part are different.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen burners, and particularly to a hydrogen-natural gas co-firing device. Background Art

[0002] In the general environmental background, more and more clean energies are being mentioned. Apart from solar energy and wind energy, the utilization of hydrogen has received increasing attention in recent years. Hydrogen is a relatively popular green and renewable energy at present, with the advantages of high calorific value per unit mass and easy full combustion.

[0003] At present, many chemical plants and the like have also changed the hydrogen treatment method from the original direct discharge and burning to secondary recycling. However, there are certain defects when hydrogen is directly applied in the field of industrial fuel combustion, such as high local temperature during hydrogen combustion, easy large-scale generation of H 2 O and other problems, and the safety performance is not high. To solve the limitations of the application of pure hydrogen in the field of industrial furnace burners, Patent CN202210982195.9 provides a hydrogen-natural gas co-firing burner, which co-fires hydrogen and natural gas as fuel gas, can effectively utilize the advantages of hydrogen and solve the disadvantages of its single combustion.

[0004] However, the above hydrogen-natural gas co-firing burner still has the following problems: the explosion limit of hydrogen combustion is 4.0% - 75.6% (volume concentration), which has a great impact on the safety of the entire combustion system; the problem of high nitrogen oxide emissions during hydrogen combustion, etc. Summary of the Invention

[0005] The present invention is made to improve the safety of the hydrogen-natural gas co-firing burner and reduce the emission of nitrogen oxides, and aims to provide a hydrogen-natural gas co-firing device.

[0006] The present invention provides a hydrogen-natural gas co-firing device, which has the following characteristics: including a panel; a gas ring arranged on the panel, including a hydrogen part of the gas ring and a natural gas part of the gas ring, the hydrogen part of the gas ring and the natural gas part of the gas ring are separated and respectively used for introducing hydrogen and natural gas; a damper part for introducing combustion-supporting air; a central jet part connected to the natural gas part of the gas ring for jetting natural gas, at least including a central gun and a plurality of ring guns arranged around the central gun; an inner ring jet part surrounding the outside of the central jet part, including at least one inner ring hydrogen gun and at least one inner ring natural gas gun; an outer ring jet part surrounding the outside of the inner ring jet part, including at least one outer ring hydrogen gun and at least one outer ring natural gas gun, wherein the inner ring hydrogen gun and the outer ring hydrogen gun are both connected to the hydrogen part of the gas ring, the inner ring natural gas gun and the outer ring natural gas gun are both connected to the natural gas part of the gas ring, at least a part of the outside of the outer ring hydrogen gun is sleeved with an air pipe, air-natural gas mixing pipes are arranged in front of the outer ring natural gas gun and the inner ring natural gas gun, and a communication port for introducing combustion-supporting air is arranged at least on one side of the air-natural gas mixing pipe close to the central gun. After the combustion-supporting air passes through the communication port and mixes with the natural gas jetted from the outer ring natural gas gun or the inner ring natural gas gun, it is jetted out from the air-natural gas mixing pipe as a natural gas-air mixture, and the jet distances of the outer ring jet part and the inner ring jet part are different.

[0007] In the hydrogen-natural gas co-firing device provided by the present invention, it may also have the following characteristics: wherein, the nozzle of the outer ring jet part is located in front of the nozzle of the inner ring jet part and forms a secondary combustion area in front of it. The secondary combustion area is used to prevent the flame from concentrating to form local high temperature, and a primary combustion area is formed in front of the nozzles of the central jet part and the inner ring jet part. The primary combustion area is used to stabilize the flame.

[0008] In the hydrogen-natural gas co-firing device provided by the present invention, it may also have the following characteristics: wherein, in the outer ring jet part, the nozzles of the outer ring hydrogen gun and the air pipe are flush, serving as the first outer ring nozzle, and the nozzle of the air-natural gas mixing pipe of the outer ring jet part serves as the second outer ring nozzle. The first outer ring nozzle is arranged in a more forward position than the second outer ring nozzle. The number of the first outer ring nozzles is twice the number of the second outer ring nozzles. The first outer ring nozzles and the second outer ring nozzles are evenly distributed in a circle around the central gun in the order of two first outer ring nozzles and one second outer ring nozzle.

[0009] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following features: Among them, in the inner ring jetting part, the nozzle of the inner ring hydrogen gun serves as the first inner ring nozzle, and the nozzle of the air-natural gas mixing pipe in the inner ring jetting part serves as the second inner ring nozzle. The second inner ring nozzle is arranged at a position that is more forward than the first inner ring nozzle and more backward than the second outer ring nozzle, and the first inner ring nozzle is arranged at a position that is more forward than the tip of the central gun. The number of the first inner ring nozzles is twice the number of the second inner ring nozzles. The first inner ring nozzles and the second inner ring nozzles are evenly distributed in a circle around the central gun in the order of two first inner ring nozzles and one second inner ring nozzle.

[0010] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following features: Among them, the number of the first outer ring nozzles is the same as that of the first inner ring nozzles, and the number of the second outer ring nozzles is the same as that of the second inner ring nozzles. The second inner ring nozzle is correspondingly arranged on the axial center line between two first outer ring nozzles.

[0011] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following features: Among them, the axial distance between the first outer ring nozzle and the second outer ring nozzle is 100 - 260 mm, the axial distance between the second outer ring nozzle and the second inner ring nozzle is 100 - 260 mm, the axial distance between the second inner ring nozzle and the first inner ring nozzle is 100 - 260 mm, the axial distance between the first inner ring nozzle and the tip of the central gun is 200 - 500 mm. The tip of the annular gun is located behind the tip of the central gun, and the axial distance between them is 30 - 120 mm.

[0012] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following features: Among them, the central jetting part further includes: a central cylinder, connected to the panel, sleeved on the central gun and arranged close to the tip of the central gun; a flame stabilizing disc, sleeved on the central gun for flame stabilization; a swirler, sleeved on the central gun, located outside the flame stabilizing disc and inside the annular gun; a throttle orifice plate, sleeved on the central gun and located between the annular gun and the central cylinder for the mixed combustion air to flow through.

[0013] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following features: Among them, the central cylinder is in the shape of a conical barrel with a large end at the front and a small end at the rear, and its necking angle is c, 0° < c ≤ 15°. The hydrogen-natural gas co-firing device further has: a throat, which is correspondingly arranged outside the inner ring jetting part. The distance from the tip of the outer ring hydrogen gun to the throat is N, 0 mm < N ≤ 300 mm; and a flue gas circulation guiding member for flue gas reflux, arranged behind the throat and close to the throat. The distance from the flue gas circulation guiding member to the throat is K, 1 mm ≤ K ≤ 100 mm.

[0014] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following characteristics: Among them, the air damper part is arranged on the panel and includes: a sleeve support member having an opening for introducing the co-firing air; a sleeve assembly including: a moving plate adapted to the shape of the opening and movably arranged inside the support member; a pusher passing through the panel and connected to the moving plate for an operator to push the moving plate to move, thereby adjusting the area of the opening blocked by the moving plate, and further adjusting the amount of co-firing air introduced.

[0015] In the hydrogen-natural gas co-firing device provided by the present invention, it may further have the following characteristics: Among them, the sleeve assembly further includes: a slide rail arranged on the panel and extending in a direction perpendicular to the panel;

[0016] a pulley adapted to the slide rail, and the pusher moves through the pulley.

[0017] Functions and effects of the invention

[0018] According to the hydrogen-natural gas co-firing device of the present invention, since it includes a gas ring, an air damper part, a central jet part, an inner ring jet part, and an outer ring jet part, the central jet part can eject natural gas. The inner ring jet part surrounds the outside of the central jet part, and the outer ring jet part surrounds the outside of the inner ring jet part. Both the outer ring jet part and the inner ring jet part can eject hydrogen and natural gas with different jet distances. Through different levels of jet distances, the entire combustion area can be divided into two levels. Among them, the primary combustion zone is formed in front of the central jet part and the inner ring jet part, near the root of the entire device, and its function is to stabilize the flame. Moreover, its fuel is mainly relatively safe natural gas, which can better stabilize the secondary combustion zone and improve the safety of the entire device. The secondary combustion zone is formed in front of the outer ring jet part, far from the root of the entire device, which can avoid local high temperatures caused by concentrated flames, thereby reducing emissions such as nitrogen oxides and solving the problem of high nitrogen oxide emissions.

[0019] In addition, since the central jet part includes a central gun and a plurality of ring guns arranged around the central gun, by sending natural gas to different positions for combustion, the problem of high central temperature during the combustion process can be solved.

[0020] In addition, since at least a part of the outside of the outer hydrogen gun is sleeved with an air pipe, air and hydrogen can be ejected simultaneously, improving the safety of hydrogen combustion. Air-natural gas mixing pipes are provided in front of both the outer natural gas gun and the inner natural gas. A communication port for introducing co-firing air is provided on at least one side of the air-natural gas mixing pipe close to the central gun. After the co-firing air passes through the communication port and mixes with the natural gas ejected from the outer natural gas gun or the inner natural gas, it is ejected from the air-natural gas mixing pipe as a natural gas-air mixture, so that the combustion effect of natural gas is better. Brief description of the drawings

[0021] Figure 1 is a schematic three - dimensional structure diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention;

[0022] Figure 2 is a schematic side - view diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention;

[0023] Figure 3 is a schematic internal - structure diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention;

[0024] Figure 4 is a schematic dimension - marking diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention;

[0025] Figure 5 is a schematic working - principle diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention. Detailed implementation manners

[0026] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the following embodiments will specifically describe the hydrogen - natural gas co - combustion device of the present invention in conjunction with the accompanying drawings.

[0027] Figure 1 is a schematic three - dimensional structure diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention; Figure 2 is a schematic side - view diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention; Figure 3 is a schematic internal - structure diagram of the hydrogen - natural gas co - combustion device in an embodiment of the present invention.

[0028] As Figures 1 to 3 shown, the hydrogen - natural gas co - combustion device 100 in this embodiment includes a panel 10, a gas ring 20, a damper part 30, a central jet part 40, an inner - ring jet part 50, an outer - ring jet part 60, a throat 70, and a smoke - circulation guide part 80. The panel 10 is used to install other components.

[0029] The gas ring 20 is arranged on the panel 10 and on the rear side of the panel 10, and includes a gas - ring hydrogen part 21 and a gas - ring natural - gas part 22. The gas - ring hydrogen part 21 and the gas - ring natural - gas part 22 are separated by a full - weld partition and are arranged separately. The gas - ring hydrogen part 21 has a hydrogen inlet 211 for introducing hydrogen. The gas - ring natural - gas part 22 has a natural - gas inlet 221 for introducing natural gas. The hydrogen inlet 211 and the natural - gas inlet 221 do not affect each other, which can meet the requirements of simultaneously inputting hydrogen and natural gas, and can also meet different requirements of supplying only one kind of gas. The gas ring 20 is fixed to the panel 10 by a plurality of gas - ring support components, and the panel 10 and the gas - ring support components are fixed by screwing.

[0030] The air damper section 30 is provided on the panel 10 and on the front side of the panel 10 for introducing mixed combustion air, and includes a sleeve support 31 and a sleeve assembly 32.

[0031] The sleeve support 31 has a chamber 311 inside, and the sleeve support 31 has an opening 312 for introducing mixed combustion air into the chamber 311. In this embodiment, a plurality of openings 312 are provided.

[0032] The sleeve assembly 32 includes a moving plate 321, a thruster 322, a slide rail 323, and a pulley 324. The moving plate 321 is adapted to the shape of the opening 312 and is movably disposed in the chamber 311. In this embodiment, the moving plate 321 is cylindrical and can fit all the openings 312 simultaneously. The thruster 322 penetrates through the panel 10 and is connected to the moving plate 321 for an operator to push the moving plate 321 to move, thereby adjusting the area of the opening blocked by the moving plate, and further adjusting the amount of mixed combustion air introduced.

[0033] The slide rail 323 is disposed in the chamber 311 and connected to the panel 10, extending in a direction perpendicular to the panel 10. The pulley 324 is adapted to the slide rail 323 and is connected to the moving plate 321. The thruster 322 pushes the moving plate 321 to move along the slide rail 323 through the moving plate 321 and the pulley 324.

[0034] The central jet section 40 is connected and communicated with the annular gas natural gas section 22 through a bent pipe ( Figure 3 not shown in the figure) for jetting natural gas. The central jet section 40 includes a central gun 41, an annular gun 42, a central cylinder 43, a flame stabilizing disc 44, a swirler 45, and a throttle orifice plate 46.

[0035] The central gun 41 penetrates through the panel 10 and is connected and communicated with the annular gas natural gas section 22 through a bent pipe. The central gun 41 has a main pipe section 411 and a central gun air supply pipe section 412. The main pipe section 411 penetrates through the panel 10. Both the central gun air supply pipe section 412 and the annular gun 42 are connected and communicated with the main pipe section 411. The annular gun 42 has a connecting pipe section 421 and an annular gun air supply pipe section 422. The annular gun air supply pipe section 422 is parallel to the central gun air supply pipe section 412.

[0036] A plurality of annular guns 42 are arranged around the central gun 41 with the central gun 41 as the center. The gun head of the annular gun 42 is located behind the gun head of the central gun 41, and the axial distance between the two is B, and the value range of B is 30 - 120 millimeters. The gun head of the central gun 41 has two spray holes, and the two spray holes are sprayed outward in a V shape. The gun head of the annular gun 42 has an outward spray hole.

[0037] Figure 4 is a schematic diagram of the dimension marking of the hydrogen-natural gas mixed combustion device in the embodiment of the present invention.

[0038] As Figure 3 and Figure 4 shown, the central cylinder 43 is connected to the panel 10 through a connecting shaft, is sleeved on the central gun 41, and is arranged close to the gun head of the central gun 41. In this embodiment, the central cylinder 43 is in the shape of a conical barrel with a large end at the front and a small end at the back, and its necking angle is c, 0° < c ≤ 15°,

[0039] The flame stabilizing disk 44 is sleeved on the central gun gas supply pipe section 412 and is arranged close to the gun head of the central gun 41 for flame stabilization. The swirler 45 is sleeved on the central gun gas supply pipe section 412, is located on the outer circle of the flame stabilizing disk 44 and inside the annular gun 42. The orifice plate 46 is sleeved on the central gun gas supply pipe section 412 and is located between the annular gun 42 and the central cylinder 43, and has a plurality of through holes for the mixed combustion air from the chamber 311 to flow through. Axially, the flame stabilizing disk 44 is substantially flush with the swirler 45 and the gun head of the annular gun 42, and the orifice plate 46 is located at the rear of the gun head of the annular gun 42.

[0040] As Figure 1 、 Figure 3 shown, the throat 70 is correspondingly arranged outside the central jetting part 40, is in the shape of a cylinder, and its rear end is connected and communicated with the chamber 311 of the sleeve support 31. The diameter of the throat 70 is smaller than that of the chamber 311. The front end of the throat 70 is in a contracted shape.

[0041] The inner ring jetting part 50 surrounds the outside of the central jetting part 40 and is located inside the throat 70, and includes at least one inner ring hydrogen gun 51 and at least one inner ring natural gas gun 52.

[0042] The outer ring jetting part 60 surrounds the outside of the inner ring jetting part 50 and includes at least one outer ring hydrogen gun 61 and at least one outer ring natural gas gun 62. In this embodiment, 12 outer ring hydrogen guns 61 are arranged, and 6 outer ring natural gas guns 62 are arranged.

[0043] The outer ring hydrogen gun 61 has an outer ring hydrogen gas supply pipe 612 and an outer ring hydrogen gun head 613. The rear end of the outer ring hydrogen gas supply pipe 612 is connected and communicated with the hydrogen part 21 of the gas ring through a bent pipe, and the front end of the outer ring hydrogen gas supply pipe 612 is connected to the outer ring hydrogen gun head 613. The outer ring hydrogen gas supply pipe 612 is parallel to the central gun gas supply pipe section 412. A section of the outer ring hydrogen gas supply pipe 612 is located inside the chamber 311, and a section is located outside the chamber 311. An air pipe 63 is sleeved outside the outer ring hydrogen gas supply pipe section located outside the chamber 311, and the air pipe 63 is communicated with the chamber 311. The outer ring hydrogen gun head 613 is axially flush with the nozzle of the air pipe 63 to serve as the outer ring first nozzle 611. The nozzle of the air pipe 63 is in a contracted shape, and the nozzle of the outer ring hydrogen gun head 613 has inward spray holes.

[0044] The outer-ring natural gas gun 62 is arranged inside the chamber 311, and its rear end is connected and communicated with the natural gas part 22 of the gas ring. Its front end serves as the gun head. An air-natural gas outer mixing pipe 64 is arranged in front of the outer-ring natural gas gun 62. The air-natural gas mixing pipe 64 is located outside the throat 70 and is communicated with the chamber 311. The communicating part is the inner communicating port 641, and the inner communicating port 641 is used for introducing the combustion-supporting air. The gun head of the outer-ring natural gas gun 62 is arranged at the inner communicating port 641. After the combustion-supporting air from the chamber 311 passes through the inner communicating port 641, it is mixed with the natural gas ejected from the gun head of the outer-ring natural gas gun 62, and then is ejected from the air-natural gas outer mixing pipe 64 as the natural gas-air mixture. The nozzle of the air-natural gas outer mixing pipe 64 serves as the outer-ring second nozzle 621. The outer-ring second nozzle 621 is arranged to incline inward.

[0045] The outer-ring first nozzle 611 is arranged at a position more forward than the outer-ring second nozzle 621. The number of the outer-ring first nozzles 611 is twice that of the outer-ring second nozzles 621. The outer-ring first nozzles 611 and the outer-ring second nozzles 621 are evenly distributed in a circle around the central gun 41 in the order of two outer-ring first nozzles 611 and one outer-ring second nozzle 612.

[0046] The inner-ring hydrogen gun 51 is connected and communicated with the hydrogen part 21 of the gas ring through a bent pipe. In this embodiment, a total of 12 inner-ring hydrogen guns 51 are arranged, and the 12 inner-ring hydrogen guns 51 are arranged in parallel. The nozzle of the inner-ring hydrogen gun 51 serves as the inner-ring first nozzle 511.

[0047] As Figure 3 shown, the inner-ring natural gas gun 52 is connected and communicated with the natural gas part 22 of the gas ring. In this embodiment, a total of 6 inner-ring natural gas guns 52 are arranged, and the 6 inner-ring natural gas guns 52 are arranged in parallel. An air-natural gas inner mixing pipe 65 is arranged in front of the inner-ring natural gas gun 52. The inner-ring natural gas gun 52 is located inside the throat 70 and is communicated with the chamber 311. The communicating part is the inner communicating port 651, and the inner communicating port 651 is used for introducing the combustion-supporting air. The gun head of the inner-ring natural gas gun 52 is arranged at the inner communicating port 651. After the combustion-supporting air from the chamber 311 passes through the inner communicating port 651, it is mixed with the natural gas ejected from the gun head of the inner-ring natural gas gun 52, and then is ejected from the air-natural gas inner mixing pipe 65 as the natural gas-air mixture. The nozzle of the air-natural gas inner mixing pipe 65 serves as the inner-ring second nozzle 521.

[0048] The number of the inner-ring first nozzles 511 is twice that of the inner-ring second nozzles 521. The inner-ring first nozzles 511 and the inner-ring second nozzles 521 are evenly distributed in a circle around the central gun 41 in the order of two inner-ring first nozzles 511 and one inner-ring second nozzle 521. The inner-ring second nozzle 521 is correspondingly arranged on the axial central axis of two outer-ring first nozzles 611.

[0049] The second inner-ring nozzle 521 is arranged at a position that is more forward than the first inner-ring nozzle 511 and more backward than the second outer-ring nozzle 621, and the first inner-ring nozzle 511 is arranged at a position that is more forward than the tip of the central gun 41. Therefore, their spraying distances are different. In this embodiment, the second inner-ring nozzle 521 is approximately flush with the front end of the throat 70. The axial distance between the first outer-ring nozzle 611 and the second outer-ring nozzle 621 is N-J, and the value range of N-J is 100-260 mm; the axial distance between the second outer-ring nozzle 621 and the second inner-ring nozzle 521 is J, and the value range of J is 100-260 mm; the axial distance between the second inner-ring nozzle 521 and the first inner-ring nozzle 511 is 100-260 mm; the axial distance between the first inner-ring nozzle 511 and the tip of the central gun 41 is 200-500 mm; the axial distance between the second inner-ring nozzle 521 and the throttle orifice plate 46 is M, and the value range of M is 80-300 mm.

[0050] The distance from the first outer-ring nozzle 611 to the throat 70 is N, and 0 mm < N ≤ 300 mm. The flue gas circulation guide member 80 is used for flue gas reflux, is arranged behind the throat 70 and close to the throat 70, and the distance from the flue gas circulation guide member 80 to the throat is K, and 1 mm ≤ K ≤ 100 mm.

[0051] Figure 5 It is the working principle diagram of the hydrogen-natural gas co-firing device in the embodiment of the present invention.

[0052] As Figure 5 shown, the combustion area of the hydrogen-natural gas co-firing device 100 is divided into two levels. The primary combustion area is formed in front of the central jetting part 40 and the inner-ring jetting part 50, close to the root of the whole device. Its function is to stabilize the flame, and its fuel is mainly relatively safe natural gas, which can better stabilize the secondary combustion area and improve the safety of the whole device; the secondary combustion area is formed in front of the outer-ring jetting part 60, far from the root of the whole device, and can avoid the local high temperature generated by the concentrated flame, thereby reducing the emissions of nitrogen oxides and the like and solving the problem of high emissions of nitrogen oxides. The reflux flue gas in the secondary combustion area is refluxed through the flue gas circulation guide member 80.

[0053] Functions and effects of the embodiment

[0054] According to the hydrogen-natural gas co-firing device involved in the present invention, since it includes an air ring, a damper part, a central jet part, an inner ring jet part, and an outer ring jet part, the central jet part can eject natural gas. The inner ring jet part surrounds the outside of the central jet part, and the outer ring jet part surrounds the outside of the inner ring jet part. Both the outer ring jet part and the inner ring jet part can eject hydrogen and natural gas with different injection distances. Through the injection distances at different levels, the entire combustion area can be divided into two levels. Among them, the primary combustion zone is formed in front of the central jet part and the inner ring jet part, near the root of the entire device. Its function is to stabilize the flame, and its fuel is mainly relatively safe natural gas, which can better stabilize the secondary combustion zone and improve the safety of the entire device. The secondary combustion zone is formed in front of the outer ring jet part, far from the root of the entire device, which can avoid the local high temperature caused by the concentration of the flame, thereby reducing the emissions of nitrogen oxides and solving the problem of high emissions of nitrogen oxides.

[0055] In addition, since the central jet part includes a central gun and a plurality of ring guns arranged around the central gun, by sending natural gas to different positions for combustion, the problem of high central temperature during the combustion process can be solved.

[0056] Furthermore, since at least a part of the outside of the outer hydrogen gun is sleeved with an air pipe, air and hydrogen can be ejected simultaneously, improving the safety of hydrogen combustion. Air-natural gas mixing pipes are provided in front of both the outer natural gas gun and the inner natural gas. At least one side of the air-natural gas mixing pipe close to the central gun is provided with a communication port for introducing mixed combustion air. After the mixed combustion air passes through the communication port and mixes with the natural gas ejected from the outer natural gas gun or the inner natural gas, it is ejected from the air-natural gas mixing pipe as a natural gas-air mixture, so that the combustion effect of natural gas is better.

[0057] Further, since the hydrogen-natural gas co-firing device is divided into multiple layers from the inside out, and there is combustion-supporting air between each fuel layer to separate them, the combustion-supporting air can be effectively separated from hydrogen and natural gas, which can be better mixed, and problems such as boiler vibration caused by mutual interference of flames between layers can be solved.

[0058] Further, since the nozzles of the outer hydrogen gun and the air pipe are flush, serving as the first outer nozzle, the nozzles of the outer hydrogen gun and the air pipe are flush, serving as the first outer nozzle, the nozzles of the inner hydrogen gun serve as the first inner nozzle, the nozzles of the inner hydrogen gun serve as the first inner nozzle. The positional relationship, quantity distribution, and the settings of the spacing and included angle between the nozzles of the first outer nozzle, the second outer nozzle, the first inner nozzle, and the second inner nozzle can further improve the combustion effect and combustion stability of the entire device.

[0059] Furthermore, the gas ring is very important for the mixed combustion of hydrogen and natural gas. The gas ring in this embodiment includes a hydrogen part and a natural gas part of the gas ring. The middle of the two is fully welded and separated by a partition plate, and their respective air inlets do not affect each other, which can meet the different requirements of simultaneously inputting hydrogen and natural gas or only supplying one kind of fuel gas. The gas ring is fixed on the panel by a plurality of gas ring support components, and the panel and the gas ring support components are fixed by screwing. The special dual-channel fuel pipeline design avoids the problem of the greater safety impact of hydrogen combustion and natural gas combustion on the entire combustion system.

[0060] Furthermore, since the central jet part also includes a central cylinder, a flame stabilizer disk, a swirler, and a throttle orifice plate, the throttle orifice plate allows the mixed combustion air to flow through, and after swirling through the swirler, it can be better mixed and burned with the natural gas ejected from the central gun and the ring gun, and the flame stabilizer disk can stabilize the flame.

[0061] Furthermore, since the contraction angle of the central cylinder is c, 0° < c ≤ 15°, which is convenient for flue gas reflux; since the distance from the gun head to the throat of the outer hydrogen gun is N, 0 mm < N ≤ 300 mm, exceeding this range is likely to cause flashback and danger; the distance from the flue gas circulation guide member to the throat is K, 1 mm ≤ K ≤ 100 mm, exceeding this range, it is not easy to generate flue gas reflux, resulting in excessive combustion emissions.

[0062] Furthermore, since the air damper part includes a sleeve support member and a sleeve assembly, the sleeve support member has an opening for introducing the mixed combustion air, the sleeve assembly has a moving plate and a pusher, and the pusher can move on the slide rail through a pulley. The operator pushes the moving plate to move, thereby adjusting the area of the opening blocked by the moving plate, and further adjusting the amount of the mixed combustion air introduced. Therefore, this device can control the amount of combustion-supporting air, and the air damper of the device head is integrated, simplifying the traditional pull rod structure and effectively improving the practicability of the device.

[0063] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydrogen-natural gas co-firing device, characterized in that, it includes: a panel; a gas ring, arranged on the panel, including a hydrogen part of the gas ring and a natural gas part of the gas ring, the hydrogen part of the gas ring and the natural gas part of the gas ring are arranged separately and are respectively used for introducing hydrogen and natural gas; a damper part, used for introducing co-firing air; a central jet part, connected to the natural gas part of the gas ring, used for spraying natural gas, at least including a central gun and a plurality of ring guns arranged around the central gun; an inner ring jet part, surrounding the outside of the central jet part, including at least one inner ring hydrogen gun and at least one inner ring natural gas gun; an outer ring jet part, surrounding the outside of the inner ring jet part, including at least one outer ring hydrogen gun and at least one outer ring natural gas gun, wherein, the inner ring hydrogen gun and the outer ring hydrogen gun are both connected to the hydrogen part of the gas ring, and the inner ring natural gas gun and the outer ring natural gas gun are both connected to the natural gas part of the gas ring, at least a part of the outside of the outer ring hydrogen gun is sleeved with an air pipe, air-natural gas mixing pipes are arranged in front of the outer ring natural gas gun and the inner ring natural gas, and a communication port for introducing the co-firing air is arranged at least on one side of the air-natural gas mixing pipe close to the central gun. After the co-firing air passes through the communication port and is mixed with the natural gas sprayed from the outer ring natural gas gun or the inner ring natural gas gun, it is sprayed out from the air-natural gas mixing pipe as a natural gas-air mixture, the spraying distances of the outer ring jet part and the inner ring jet part are different.

2. The hydrogen-natural gas co-firing device according to claim 1, characterized in that: wherein, the nozzle of the outer ring jet part is located in front of the nozzle of the inner ring jet part, and a secondary combustion area is formed in front of it. The secondary combustion area is used to prevent the flame from concentrating to form local high temperature, a primary combustion area is formed in front of the nozzles of the central jet part and the inner ring jet part. The primary combustion area is used to stabilize the flame.

3. The hydrogen-natural gas co-firing device according to claim 2, characterized in that: wherein, in the outer ring jet part, the nozzle of the outer ring hydrogen gun and the nozzle of the air pipe are flush, serving as the first outer ring nozzle, the nozzle of the air-natural gas mixing pipe of the outer ring jet part serves as the second outer ring nozzle, the first outer ring nozzle is arranged in a more forward position than the second outer ring nozzle, the number of the first outer ring nozzles is 2 times the number of the second outer ring nozzles, the first outer ring nozzles and the second outer ring nozzles are evenly distributed in a circle around the central gun in the order of two first outer ring nozzles and one second outer ring nozzle.

4. The hydrogen-natural gas co-firing device according to claim 3, characterized in that: wherein, in the inner ring jet part, the nozzle of the inner ring hydrogen gun serves as the first inner ring nozzle, the nozzle of the air-natural gas mixing pipe of the inner ring jet part serves as the second inner ring nozzle, the second inner ring nozzle is arranged in a position that is more forward than the first inner ring nozzle and more backward than the second outer ring nozzle, and the first inner ring nozzle is arranged in a position that is more forward than the tip of the central gun, The number of the first inner nozzles is twice the number of the second inner nozzles. The first inner nozzles and the second inner nozzles are evenly distributed in a circle around the central gun in the order of two first inner nozzles and one second inner nozzle.

5. The hydrogen-natural gas co-firing device according to claim 4, wherein: Wherein, The number of the first outer nozzles is the same as that of the first inner nozzles, and the number of the second outer nozzles is the same as that of the second inner nozzles. The second inner nozzle is correspondingly arranged on the axial central axis of two first outer nozzles.

6. The hydrogen-natural gas co-firing device according to claim 4, wherein: Wherein, The axial distance between the first outer nozzle and the second outer nozzle is 100-260 mm, the axial distance between the second outer nozzle and the second inner nozzle is 100-260 mm, the axial distance between the second inner nozzle and the first inner nozzle is 100-260 mm, and the axial distance between the first inner nozzle and the tip of the central gun is 200-500 mm. The tip of the annular gun is located behind the tip of the central gun, and the axial distance between them is 30-120 mm.

7. The hydrogen-natural gas co-firing device according to claim 1 ， wherein: Wherein, The central air jetting part further includes: A central cylinder, connected to the panel, sleeved on the central gun and arranged close to the tip of the central gun; A flame stabilizing disc, sleeved on the central gun and used for stabilizing the flame; A swirler, sleeved on the central gun, located outside the flame stabilizing disc and inside the annular gun; A throttle orifice plate, sleeved on the central gun and located between the annular gun and the central cylinder, for allowing the mixed combustion air to flow through.

8. The hydrogen-natural gas co-firing device according to claim 7 ， wherein: Wherein, The central cylinder is in the shape of a truncated cone with a large front end and a small rear end, and its necking angle is c, 0°<C≤15°. The hydrogen-natural gas co-firing device further has: A throat, correspondingly arranged outside the inner air jetting part, and the distance from the tip of the outer hydrogen gun to the throat is N, 0mm<N≤300mm; and A flue gas circulation guiding member, used for flue gas reflux, arranged behind the throat and close to the throat, and the distance from the flue gas circulation guiding member to the throat is K, 1mm≤K≤100mm.

9. The hydrogen-natural gas co-firing device according to claim 1 ， wherein: Wherein, The air damper part is arranged on the panel and includes: A sleeve support member, having an opening for introducing the mixed combustion air; A sleeve assembly, including: A moving plate, adapted to the shape of the opening and movably arranged inside the support member; A pusher, passing through the panel and connected to the moving plate, for allowing an operator to push the moving plate to move, so as to adjust the area of the opening blocked by the moving plate, and further adjust the amount of the mixed combustion air introduced.

10. The hydrogen-natural gas co-firing device according to claim 2, wherein: Wherein, The sleeve assembly further includes: A slide rail, disposed on the panel and extending in a direction perpendicular to the panel; a pulley, adapted to the slide rail, and the pusher moves through the pulley.

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