Hydrogen-natural gas wide-range mixed combustion device for industrial furnace

Abstract

The application relates to the technical field of combustion equipment, in particular to a hydrogen-natural gas wide-range mixing combustion device for an industrial furnace. The hydrogen-natural gas wide-range mixing combustion device comprises an outer pipe, a return air pipe is connected to the outer pipe, one end of the return air pipe away from the outer pipe is arranged as a combustion port, a gas guide cover is arranged in the outer pipe, the gas guide cover comprises an annular plate connected with the outer pipe, a first air outlet is arranged on the annular plate, a control assembly for controlling the air flow of the first air outlet is arranged on the annular plate, a mixing cover for mixing air and fuel gas is arranged on the annular plate, an inner pipe for inputting fuel gas is connected to the mixing cover, one end of the inner pipe is inserted into the mixing cover, and the one end of the inner pipe inserted into the mixing cover is a nozzle. The hydrogen-natural gas wide-range mixing combustion device for the industrial furnace has the effect of improving the efficiency during use.

Description

Technical Field

[0001] This application relates to the field of combustion equipment technology, and in particular to a hydrogen-natural gas wide-range mixing combustion device for industrial furnaces. Background Technology

[0002] To ensure that waste gas emissions meet standards in industrial production, it is usually necessary to treat the waste gas by combustion in a combustion furnace or oxidation furnace. In order to ensure the combustion state and temperature in the combustion furnace, a burner is usually installed in the combustion furnace to introduce gas for ignition and to maintain the temperature in the combustion furnace.

[0003] Burners use hydrogen or natural gas mixed with air to form the fuel gas. Traditional industrial furnaces face the following problems when burning with hydrogen or natural gas: the physical properties of hydrogen or natural gas are very different, including diffusion rate and combustion speed. Uneven mixing leads to fluctuating flame shape and unstable heat load; the flame ionization signal is weak when hydrogen is burning, and traditional ultraviolet and ion fire detection systems are prone to failure; the flame propagation speed is faster under high hydrogen ratio, and the risk of backfire is significantly increased; the adjustment range of existing premixed combustion technology is limited and cannot adapt to the variable load requirements of industrial furnaces, and cannot solve the flame stability problem under wide-range hydrogen or natural gas blending. Summary of the Invention

[0004] In order to improve the efficiency of hydrogen-natural gas wide-range mixing combustion device for industrial furnaces during use, this application provides a hydrogen-natural gas wide-range mixing combustion device for industrial furnaces.

[0005] This application provides a hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces, adopting the following technical solution:

[0006] An industrial furnace hydrogen-natural gas wide-range mixing and combustion device includes an external pipe connected to a return air pipe. The end of the return air pipe furthest from the external pipe is configured as a combustion port. A gas guide hood is installed inside the external pipe. The gas guide hood includes an annular plate connected to the external pipe. A first air outlet is formed on the annular plate. A control component for controlling the airflow at the first air outlet is installed on the annular plate. A mixing hood is installed on the annular plate. An internal pipe for introducing fuel gas is connected to the mixing hood. One end of the internal pipe extends into the mixing hood, and this end is configured as a nozzle.

[0007] By adopting the above technical solution, air is introduced from the external pipe. When the air passes through the air guide shroud, part of the air will enter the inner side of the mixing shroud from the mixing shroud. The fuel gas is introduced from the internal pipe and will enter the inner side of the mixing shroud and mix with the air. The other part of the air introduced from the external pipe will flow through the first air outlet on the annular plate and pass through the air guide shroud. The air flowing out from the first air outlet will impact the inner wall of the return air duct. The air and fuel gas will mix again after being recirculated and mixed through the inner wall of the return air duct, which helps to enhance the mixing effect. Since the combustion zone is located at the air outlet of the return air duct, it can also preheat the fresh mixture by entraining high-temperature combustion products to form a continuous ignition source. This is beneficial for the separate mixing of air and fuel gas, helps to eliminate the risk of backfire and spontaneous combustion, and can enhance the mixing effect of air and fuel gas and the subsequent combustion effect of fuel gas.

[0008] In one specific implementation, the control component includes a mounting cylinder disposed within the first air outlet. A support rod is mounted on the mounting cylinder, and a central cylinder is connected to the support rod. A first mounting groove is formed on the central cylinder, and a guide rod is mounted on the central cylinder, disposed within the first mounting groove. A slider is slidably connected to the guide rod, and a spring is sleeved on the guide rod. One end of the spring is connected to the slider, and the other end is connected to the central cylinder. A movable rod is connected to the slider. A screw for controlling the movement of the movable rod is threaded onto the mounting cylinder. An opening / closing plate for controlling airflow is hinged to the mounting cylinder. A first connecting rod is connected to the movable rod and is connected to the opening / closing plate. A guide vane for controlling the airflow direction is connected to the first connecting rod.

[0009] In one specific implementation, a second connecting rod is connected to the first connecting rod, a third connecting rod is connected to the second connecting rod, a sliding rod is installed on the third connecting rod, a fixing plate is installed on the opening and closing plate, a first sliding groove is provided on the fixing plate, and the sliding rod is slidably connected to the fixing plate through the first sliding groove.

[0010] By adopting the above technical solution, before combustion, the operator can adjust the position of the screw by rotating it. When the screw moves closer to the movable rod, it pushes the movable rod to slide on the guide rod. When the movable rod moves, it drives the first connecting rod, the second connecting rod, and the third connecting rod to move. The slide bar on the third connecting rod slides in the first slide groove on the fixed plate. The third connecting rod and the slide bar pull the opening and closing plate to rotate. By rotating the screw to change its position, the opening and closing degree of the opening and closing plate can be quickly adjusted, controlling the airflow at the first air outlet. This allows for rapid changes and adjustments to the airflow through the air guide hood. The amount of air to be remixed can be changed according to the airflow rate of the external pipe. This facilitates the operator to adjust the secondary mixing airflow rate according to the air-to-gas ratio, which helps to enhance the burner's performance and improve its ability to mix gas.

[0011] In one specific implementation, three or more first rotating rods are rotatably mounted on the mounting cylinder. One end of each first rotating rod extends into the inside of the mounting cylinder, and a guide vane is mounted on the end of the first rotating rod extending into the inside of the mounting cylinder. A second rotating rod is mounted on the guide vane, and the second rotating rod is rotatably mounted on the central cylinder. A first swing rod is connected to the first rotating rod, and a fourth connecting rod is hinged to the first swing rod. The end of the fourth connecting rod away from the first swing rod is hinged to another adjacent first swing rod. A second swing rod is connected to the first rotating rod, and a third swing rod is hinged to the end of the second swing rod away from the first rotating rod. A fifth connecting rod is hinged to the third swing rod, and the fifth connecting rod is connected to the first connecting rod.

[0012] By adopting the above technical solution, when the screw is rotated to adjust the airflow, the first connecting rod pulls the fifth connecting rod to move. The fifth connecting rod then drags the third and second swing rods to swing. The second swing rod pulls the first rotating rod to rotate, and the first rotating rod drives the air guide vanes to rotate, thereby quickly adjusting the tilt angle of the air guide vanes. This changes the airflow direction, facilitating airflow back into the return air duct. It also allows the air to form a certain angle of convection with the mixed fuel gas, enhancing the mixing effect. The spacing between adjacent air guide vanes can also be adjusted according to changes in the airflow at the inlet of the installation cylinder, further improving airflow.

[0013] In one specific implementation scheme, the mixing hood is configured as a pipe with a frustum-shaped axial cross-section. The large-diameter end of the mixing hood is fixedly connected to the annular plate, and the small-diameter end of the mixing hood is located on the side of the annular plate away from the return air pipe. A first mixing hole group is provided on the side wall of the mixing hood. The first mixing hole group is arranged along the axial direction of the mixing hood from the small-diameter end to the large-diameter end. An end wall is provided at the small-diameter end of the mixing hood, and the inner pipe is connected to the end wall. A second air outlet is provided on the end wall.

[0014] In one specific implementation, the air outlet nozzle includes a single main air outlet, which is opened on the end face of the inner tube, and two or more secondary air outlets are opened on the peripheral sidewall of the air outlet nozzle, which are arranged around the main air outlet.

[0015] By adopting the above technical solution, when air passes through the air guide shroud, a portion of the air enters the inner side of the mixing shroud through the second air outlet and mixing hole group on the mixing shroud. The fuel gas is then introduced through the inner pipe, and enters the inner side of the mixing shroud through the main and secondary air outlets to mix with the air, which is beneficial for the separate mixing of air and fuel gas. Setting the mixing shroud as a pipe with a frustum-shaped axial cross-section allows the air flowing in from the mixing shroud to form a certain angle of convection with the fuel gas flowing out from the secondary air outlet, enhancing the mixing effect of air and fuel gas.

[0016] In one specific implementation, the axis of the secondary air outlet intersects the axis of the main air outlet.

[0017] By adopting the above technical solution, the secondary air outlet can be opened at an angle to enhance the convection effect and the mixing effect.

[0018] In one specific implementation scheme, the mixing hood is configured as a funnel-shaped pipe, with the large-diameter end of the mixing hood fixedly connected to the annular plate and the small-diameter end of the mixing hood fixedly connected to the inner pipe. A second mixing hole group is provided on the mixing hood, and the second mixing hole group is arranged on the mixing hood from the small-diameter end of the mixing hood to the large-diameter end of the mixing hood.

[0019] In one specific implementation, the air nozzle includes two or more first air outlets, the first air outlets being opened on the end face of the inner tube, and two or more second air outlets being opened on the side wall of the inner tube, the second air outlets being opened radially.

[0020] By adopting the above technical solution and setting the mixing hood in the shape of a horn, the flame front end and the return air duct area can be effectively isolated, preventing the risk of backflow when the flame fluctuates.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. Air is introduced through the external duct. As the air passes through the air guide shroud, a portion of the air enters the mixing shroud from the inside. Combustion is introduced through the internal duct, where it mixes with the air. The remaining air from the external duct flows through the first outlet on the annular plate and then through the air guide shroud. The air exiting the first outlet impacts the inner wall of the return duct, where it is recirculated and mixed with the combustion gas. This process enhances the mixing effect. Because the combustion zone is located at the outlet of the return duct, it can also preheat the fresh mixture by entraining high-temperature combustion products, forming a continuous ignition source. This facilitates the separate mixing of air and fuel gas, helps eliminate the risk of backfire and spontaneous combustion, and enhances the mixing effect of air and combustion gas, as well as the subsequent combustion effect of the combustion gas. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the burner of Embodiment 1 of this application.

[0024] Figure 2 This is a cross-sectional view of the burner of Embodiment 1 of this application.

[0025] Figure 3 This is a cross-sectional view of the air duct of Embodiment 1 of this application.

[0026] Figure 4 This is a schematic diagram of the control component of Embodiment 1 of this application.

[0027] Figure 5 This is a cross-sectional view of the control component of Embodiment 1 of this application.

[0028] Figure 6 Figure 5 Enlarged view of point A in the middle.

[0029] Figure 7 This is a schematic diagram illustrating the connection relationship between the first and second pendulum rods in Embodiment 1 of this application.

[0030] Figure 8 This is a schematic diagram illustrating the installation position of the air guide plate in Embodiment 1 of this application.

[0031] Figure 9 This is a cross-sectional view of the burner of Embodiment 2 of this application.

[0032] Figure 10 This is a cross-sectional view of the air duct of Embodiment 2 of this application.

[0033] Reference numerals: 1. External duct; 11. Return air duct; 12. Combustion port; 13. Reinforcing plate; 2. Air guide hood; 21. Annular plate; 22. First air outlet; 23. Mixing hood; 231. First mixing hole; 232. Second mixing hole; 233. Third mixing hole; 234. Fourth mixing hole; 24. End wall; 241. Second air outlet; 25. Fifth mixing hole; 3. Internal duct; 31. Air outlet nozzle; 311. Main air outlet; 312. Secondary air outlet; 313. First air outlet; 314. Second air outlet; 4. Control component; 41. Mounting cylinder; 42 43. Support rod; 444. Central cylinder; 445. First mounting groove; 446. Screw; 447. Guide rod; 448. Slider; 449. Spring; 45. Movable rod; 46. First connecting rod; 47. Second connecting rod; 48. Third connecting rod; 49. Slide rod; 40. Opening and closing plate; 41. Fixed plate; 452. First sliding groove; 463. First rotating rod; 464. Air guide plate; 465. Second rotating rod; 466. First swing rod; 467. Fourth connecting rod; 468. Second swing rod; 469. Third swing rod; 400. Fifth connecting rod. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-10 This application will be described in further detail.

[0035] Example 1:

[0036] This application discloses a hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces, referencing... Figure 1 and Figure 2 It includes an external air inlet pipe 1, an air guide cover 2 fixedly installed inside the external air inlet pipe 1, and an internal gas inlet pipe 3 fixedly connected to the air guide cover 2.

[0037] The end of the external pipe 1 is fixedly connected to the return air pipe 11. The return air pipe 11 is configured as a pipe with a frustum shape in axial section. The large-diameter end of the return air pipe 11 is fixedly connected to the external pipe 1, and the small-diameter end of the return air pipe 11 is the combustion port 12.

[0038] Reference Figure 2 and Figure 3The air guide hood 2 includes an annular plate 21, which is fixedly installed on the inner wall of the external pipe 1. A reinforcing plate 13 is fixedly installed on the inner wall of the external pipe 1 and is also fixedly connected to the annular plate 21. A first air outlet 22 is provided on the annular plate 21. A mixing hood 23 is fixedly connected to the annular plate 21. The mixing hood 23 is configured as a pipe with a frustum shape in axial cross-section. The large-diameter end of the mixing hood 23 is fixedly connected to the annular plate 21, and the small-diameter end of the mixing hood 23 is located on the side of the annular plate 21 away from the return air pipe 11. A first mixing hole group is provided on the side wall of the mixing hood 23. The first mixing hole group includes a plurality of first mixing holes 231, which are arranged in a circumferential direction with the axis of the mixing hood 23 as the center.

[0039] The mixing hood 23 has an end wall 24 at one end with a small diameter, and a second air outlet 241 is provided on the end wall 24. The end wall 24 of the mixing hood 23 is fixedly connected to the inner pipe 3. One end of the inner pipe 3 passes through the end wall 24 and extends into the inside of the mixing hood 23. The end of the inner pipe 3 extending into the inside of the mixing hood 23 is set as an air outlet nozzle 31. The air outlet nozzle 31 includes a single main air outlet 311, which is located on the end face of the inner pipe 3. Two or more secondary air outlets 312 are provided on the peripheral sidewall of the air outlet nozzle 31. The two or more secondary air outlets 312 are arranged around the main air outlet 311, and the axis of the secondary air outlet 312 intersects the axis of the main air outlet 311.

[0040] Air is introduced through the outer pipe 1. As the air passes through the air guide shroud 2, a portion of the air enters the inner side of the mixing shroud 23 through the second air outlet 241 and the first mixing hole group. Combustion is introduced through the inner pipe 3, and the combustion gas enters the inner side of the mixing shroud 23 through the main outlet 311 and the secondary outlet 312, mixing with the air. Because the first mixing hole 231 is stepped in the air intake direction due to the different diameters of the mixing shroud 23, it facilitates the separate mixing of air and fuel gas, effectively preventing backfire and spontaneous combustion. The mixing shroud 23 is designed as a pipe with a frustum-shaped axial cross-section, and the secondary outlet 312 is angled, allowing the air flowing into the mixing shroud 23 to form a certain angle of convection with the combustion gas flowing out of the secondary outlet 312, enhancing the mixing effect of air and combustion gas.

[0041] Another portion of the air introduced from the external duct 1 will flow through the first air outlet 22 on the annular plate 21 and pass through the air guide hood 2. The air flowing out from the first air outlet 22 will impact the inner wall of the return air duct 11. The air and gas will be mixed again after being returned and mixed by the inclined inner wall of the return air duct 11, which helps to enhance the mixing effect. Since the combustion zone is located at the combustion port 12 of the return air duct 11, it can also preheat the fresh mixture by entraining high-temperature combustion products to form a continuous ignition source.

[0042] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6 A control component 4 for controlling the opening and closing of the first air outlet 22 and the airflow is installed on the annular plate 21. The control component 4 includes a mounting cylinder 41, which is fixedly installed on the annular plate 21 and located inside the first air outlet 22. A support rod 42 is fixedly installed on the inner wall of the mounting cylinder 41, and a central cylinder 43 is fixedly installed on the support rod 42. A screw 441 is threadedly connected to the inner wall of the central cylinder 43. A first mounting groove 431 is opened on the central cylinder 43, and a guide rod 442 is fixedly installed on the central cylinder 43. The guide rod 442 is located inside the first mounting groove 431, and a slider 443 is slidably installed on the guide rod 442. A spring 444 is sleeved on the guide rod 442. One end of the spring 444 is fixedly connected to the slider 443, and the other end is fixedly connected to the inner wall of the central cylinder 43. A movable rod 445 is fixedly mounted on the slider 443. The end of the movable rod 445 near the screw 441 abuts against the screw 441. A first connecting rod 446 is fixedly mounted on the end of the movable rod 445 away from the screw 441. The first connecting rod 446 passes through the mounting cylinder 41 and is slidably connected to the mounting cylinder 41. A second connecting rod 447 is fixedly mounted on the first connecting rod 446. The second connecting rod 447 is located on the outside of the mounting cylinder 41 and passes through the annular plate 21 and is slidably connected to the annular plate 21. Four opening and closing plates 45 are hinged to the end of the mounting cylinder 41 away from the return air duct 11. The four opening and closing plates 45 are fan-shaped plates and are initially in an open state on the mounting cylinder 41. A fixed plate 451 is fixedly mounted on the opening and closing plates 45, and a first sliding groove 452 is formed on the fixed plate 451. A third connecting rod 448 is fixedly installed at the end of the second connecting rod 447 away from the first connecting rod 446. A sliding rod 449 is fixedly installed on the third connecting rod 448. The sliding rod 449 is slidably installed on the fixed plate 451 through the first sliding groove 452.

[0043] Before combustion, the operator rotates screw 441 to adjust its position. When screw 441 moves closer to movable rod 445, it pushes movable rod 445 to slide on guide rod 442 and presses spring 444. The movement of movable rod 445 causes the first connecting rod 446, second connecting rod 447, and third connecting rod 448 to move. The slide bar 449 on the third connecting rod 448 slides within the first sliding groove 452 on the fixed plate 451. Rod 449 pulls the opening and closing plate 45 to rotate. By rotating screw 441, the position of screw 441 can be changed, which can quickly adjust the opening and closing degree of the opening and closing plate 45 and control the airflow of the first air outlet 22. This allows for rapid changes and adjustments to the airflow through the air guide hood 2. The amount of air to be mixed again is changed according to the airflow of the external pipe 1. This makes it convenient for operators to adjust the secondary mixing airflow according to the air-to-gas ratio, which helps to enhance the performance of the burner and improve the ability to mix gas.

[0044] Reference Figure 5 , Figure 7 and Figure 8 Three or more first rotating rods 461 are rotatably mounted on the mounting cylinder 41. One end of each first rotating rod 461 extends into the inside of the mounting cylinder 41, and the other end extends outward from the outside of the mounting cylinder 41. A guide vane 462 is fixedly mounted on the end of the first rotating rod 461 that extends into the mounting cylinder 41. A second rotating rod 463 is fixedly mounted on the end of the guide vane 462 that is away from the first rotating rod 461. The second rotating rod 463 is rotatably mounted on the central cylinder 43. A first swing rod 464 is fixedly mounted on the end of the first rotating rod 461 that extends outward from the mounting cylinder 41. A fourth connecting rod 465 is ball-jointed to the first swing rod 464. The end of the fourth connecting rod 465 that is away from the first swing rod 464 is hinged to the adjacent first swing rod 464. That is, a fourth connecting rod 465 is hinged between each adjacent first swing rod 464. A second swing arm 466 is fixedly installed on the first rotating rod 461. A third swing arm 467 is hinged to the end of the second swing arm 466 away from the first rotating rod 461. A fifth connecting rod 468 is hinged to the end of the third swing arm 467 away from the second swing arm 466. The fifth connecting rod 468 is fixedly connected to the first connecting rod 446.

[0045] When the airflow is adjusted by rotating screw 441, the first connecting rod 446 pulls the fifth connecting rod 468 to move. The fifth connecting rod 468 then drags the third swing rod 467 and the second swing rod 466 to swing. The second swing rod 466 pulls the first rotating rod 461 to rotate. The first rotating rod 461 drives the air guide vane 462 to rotate, thus quickly adjusting the tilt angle of the air guide vane 462. When the first rotating rod 461 rotates, the first swing rod 464 also rotates, pulling the fourth connecting rod 465 to move. The fourth connecting rod 465 drives the other fourth and first swing rods 464 to rotate, thereby pulling all the air guide vanes 462 to adjust their angles, changing the airflow direction, facilitating airflow back into the return air duct 11, and also allowing the air to form a certain angle of convection with the mixed gas, facilitating mixing and enhancing the mixing effect. The spacing between adjacent air guide vanes 462 can also be adjusted according to the airflow at the inlet of the mounting cylinder 41, which helps to enhance airflow.

[0046] Example 2:

[0047] The difference between this embodiment and Embodiment 1 is that: (Refer to...) Figure 9 and Figure 10 The mixing hood 23 is configured as a funnel-shaped pipe. The large-diameter end of the mixing hood 23 is fixedly connected to the annular plate 21, and the small-diameter end of the mixing hood 23 is fixedly connected to the inner pipe 3. A second mixing hole group is provided on the mixing hood 23. The second mixing hole group consists of a fifth mixing hole 25. The fifth mixing holes 25 are arranged in a straight line on the mixing hood 23 from the small-diameter end of the mixing hood 23 to the large-diameter end of the mixing hood 23.

[0048] The air nozzle 31 includes two or more first air outlets 313, which are axially opened on the end face of the inner tube 3. Two or more second air outlets 314 are opened on the side wall of the inner tube 3, which are radially opened.

[0049] Setting the mixing hood 23 in a funnel shape can effectively isolate the flame front and the return air duct 11 area, preventing the risk of backflow when the flame fluctuates.

[0050] The implementation principle of this application embodiment is as follows: air is introduced into the outer pipe 1. When the air passes through the air guide shroud 2, a portion of the air will enter the inner side of the mixing shroud 23. The fuel gas is introduced into the inner pipe 3. The fuel gas will enter the inner side of the mixing shroud 23 and mix with the air. This is beneficial for the separate mixing of air and fuel gas, which helps to eliminate the risk of backfire and spontaneous combustion and enhances the mixing effect of air and fuel gas.

[0051] Another portion of the air introduced from the external duct 1 will flow through the first air outlet 22 on the annular plate 21 and pass through the air guide hood 2. The air flowing out from the first air outlet 22 will impact the inner wall of the return air duct 11. The air and gas will be mixed again after being returned and mixed by the inclined inner wall of the return air duct 11, which helps to enhance the mixing effect. Since the combustion zone is located at the combustion port 12 of the return air duct 11, it can also preheat the fresh mixture by entraining high-temperature combustion products to form a continuous ignition source.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces, characterized in that: The system includes an external pipe (1), a return air pipe (11) connected to the external pipe (1), a combustion port (12) at the end of the return air pipe (11) away from the external pipe (1), a gas guide hood (2) installed inside the external pipe (1), the gas guide hood (2) including an annular plate (21) connected to the external pipe (1), a first air outlet (22) opened on the annular plate (21), a control component (4) for controlling the air flow of the first air outlet (22) installed on the annular plate (21), a mixing hood (23) for mixing air and gas installed on the annular plate (21), an internal pipe (3) for introducing gas connected to the mixing hood (23), one end of the internal pipe (3) extending into the mixing hood (23), and the end of the internal pipe (3) extending into the mixing hood (23) being an air outlet nozzle (31). The control component (4) includes a mounting cylinder (41) disposed within the first air outlet (22). A support rod (42) is mounted on the mounting cylinder (41), and a central cylinder (43) is connected to the support rod (42). A first mounting groove (431) is provided on the central cylinder (43), and a guide rod (442) is mounted on the central cylinder (43). The guide rod (442) is disposed within the first mounting groove (431), and a slider (443) is slidably connected to the guide rod (442). A spring (444) is sleeved on the guide rod (442). One end of the spring (444) is connected to the slider (443), and the other end is connected to the central cylinder (43). A movable rod (445) is connected to the slider (443). A screw (441) for controlling the movement of the movable rod (445) is threaded onto the mounting cylinder (41). An opening and closing plate (45) for controlling airflow is hinged onto the mounting cylinder (41). A first connecting rod (446) is connected to the movable rod (445). The first connecting rod (446) is connected to the opening and closing plate (45). A guide vane (462) for controlling airflow direction is connected to the first connecting rod (446).

2. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 1, characterized in that: A second connecting rod (447) is connected to the first connecting rod (446), a third connecting rod (448) is connected to the second connecting rod (447), a sliding rod (449) is installed on the third connecting rod (448), a fixing plate (451) is installed on the opening and closing plate (45), a first sliding groove (452) is provided on the fixing plate (451), and the sliding rod (449) is slidably connected to the fixing plate (451) through the first sliding groove (452).

3. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 1, characterized in that: Three or more first rotating rods (461) are rotatably mounted on the mounting cylinder (41). One end of each first rotating rod (461) extends into the inner side of the mounting cylinder (41). A guide vane (462) is mounted on the end of each first rotating rod (461) extending into the inner side of the mounting cylinder (41). A second rotating rod (463) is mounted on the guide vane (462). The second rotating rod (463) is rotatably mounted on the central cylinder (43). A first swing rod (464) is connected to each first rotating rod (461). 64) A fourth connecting rod (465) is hinged on the upper part. The end of the fourth connecting rod (465) away from the first swing rod (464) is hinged to another adjacent first swing rod (464). A second swing rod (466) is connected to the first rotating rod (461). A third swing rod (467) is hinged to the end of the second swing rod (466) away from the first rotating rod (461). A fifth connecting rod (468) is hinged to the third swing rod (467). The fifth connecting rod (468) is connected to the first connecting rod (446).

4. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 1, characterized in that: The mixing hood (23) is configured as a pipe with a frustum shape in axial section. The large diameter end of the mixing hood (23) is fixedly connected to the annular plate (21). The small diameter end of the mixing hood (23) is located on the side of the annular plate (21) away from the return air pipe (11). A first mixing hole group is provided on the side wall of the mixing hood (23). The first mixing hole group is arranged from the small diameter end to the large diameter end along the axial direction of the mixing hood (23). An end wall (24) is provided at the small diameter end of the mixing hood (23). The inner pipe (3) is connected to the end wall (24). A second air outlet (241) is provided on the end wall (24).

5. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 4, characterized in that: The air outlet nozzle (31) includes a single main air outlet (311), which is opened on the end face of the inner tube (3). Two or more secondary air outlets (312) are opened on the peripheral sidewall of the air outlet nozzle (31), and the secondary air outlets (312) are arranged around the main air outlet (311).

6. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 5, characterized in that: The axis of the secondary air outlet (312) intersects the axis of the main air outlet (311).

7. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 1, characterized in that: The mixing hood (23) is configured as a flared pipe. The large diameter end of the mixing hood (23) is fixedly connected to the annular plate (21), and the small diameter end of the mixing hood (23) is fixedly connected to the inner pipe (3). A second mixing hole group is provided on the mixing hood (23). The second mixing hole group is arranged on the mixing hood (23) from the small diameter end of the mixing hood (23) to the large diameter end of the mixing hood (23).

8. The hydrogen-natural gas wide-range mixing and combustion device for industrial furnaces according to claim 7, characterized in that: The air nozzle (31) includes two or more first air outlets (313), which are opened on the end face of the inner tube (3), and two or more second air outlets (314) are opened on the side wall of the inner tube (3), which are radially opened.

Images