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

Abstract

The invention relates to the technical field of combustion equipment, in particular to a hydrogen-natural gas wide-area mixed combustion device for an industrial furnace, which comprises an outer through pipe, an air return pipe is connected to the outer through pipe, a combustion port is arranged at one end, far away from the outer through pipe, of the air return pipe, and a gas guide cover is mounted in the outer through pipe; the gas guide cover comprises an annular plate connected with the outer through pipe, a first air outlet is formed in the annular plate, a control assembly for controlling the air flow of the first air outlet is installed on the annular plate, and a flow mixing cover for mixing air and fuel gas is installed on the annular plate. The flow mixing cover is connected with an inner through pipe for introducing fuel gas, one end of the inner through pipe extends into the flow mixing cover, and the end, extending into the flow mixing cover, of the inner through pipe is a nozzle. The hydrogen-natural gas wide-range mixed combustion device for the industrial furnace has the effect that the high efficiency of the hydrogen-natural gas wide-range mixed combustion device for the industrial furnace in the using process is improved.

Description

Technical Field

[0001] The present application relates to the technical field of combustion equipment, and in particular to a hydrogen-natural gas wide-range mixed combustion device for industrial furnaces. Background Art

[0002] In order to ensure that the exhaust gas in industrial production meets the emission standards, it is usually necessary to burn the exhaust gas in a combustion furnace or an 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 fuel gas for ignition and maintain the temperature in the combustion furnace.

[0003] The burner generates the fuel gas by introducing hydrogen or natural gas and mixing it with air. Traditional industrial furnace burners face the following problems when burning with hydrogen or natural gas: hydrogen or natural gas has large differences in physical properties, including diffusion rate and combustion speed, and uneven mixing leads to fluctuations in flame shape and unstable thermal load; the flame ionization signal is weak when hydrogen burns, and traditional ultraviolet and ion flame detection systems are prone to failure; the flame propagation speed is accelerated at a high hydrogen ratio, and the risk of flashback is significantly increased; the existing premixed combustion technology has a limited adjustment range and is difficult to adapt to the variable load requirements of industrial furnaces, and cannot solve the flame stability problem under wide-range hydrogen or natural gas mixing. Summary of the invention

[0004] In order to improve the efficiency of a hydrogen-natural gas wide-range mixed combustion device for an industrial furnace during use, the present application provides a hydrogen-natural gas wide-range mixed combustion device for an industrial furnace.

[0005] This application provides a hydrogen-natural gas wide-range mixed combustion device for an industrial furnace, which adopts the following technical solution: A hydrogen-natural gas wide-range mixed combustion device for an industrial furnace comprises an outer through-tube, the outer through-tube is connected to a return air duct, one end of the return air duct away from the outer through-tube is arranged as a combustion port, an air guide hood is installed in the outer through-tube, the air guide hood comprises an annular plate connected to the outer through-tube, a first air outlet is provided on the annular plate, a control component for controlling the air flow rate of the first air outlet is installed on the annular plate, a mixed flow hood is installed on the annular plate, an inner through-tube for introducing fuel gas is connected to the mixed flow hood, one end of the inner through-tube extends into the mixed flow hood, and the end of the inner through-tube extending into the mixed flow hood is arranged as a nozzle.

[0006] By adopting the above technical scheme, air is introduced from the outer pipe, and when the air passes through the air guide hood, part of the air will enter the inner side of the mixed flow hood from the mixing flow hood, and the gas is introduced from the inner pipe, and the gas will enter the inner side of the mixed flow hood and mix with the air, and the other part of the air introduced from the outer pipe will flow through the air guide hood through the first air outlet position on the annular plate, and the air flowing out from the first air outlet will impact on the inner wall of the return air duct, and the air and gas after reflux and mixing through the inner wall of the return air duct will be mixed again, which is beneficial to enhance the mixing effect. Because the combustion area is at the position of the air outlet of the return air duct, the fresh mixed gas can also be preheated by sucking high-temperature combustion products to form a continuous ignition source, which is beneficial to the step-by-step mixing of air and fuel gas, and is beneficial to eliminating the risks of backfire and spontaneous combustion, and can enhance the mixing effect of air and gas and the subsequent combustion effect of gas.

[0007] In a specific feasible implementation scheme, the control component includes a mounting cylinder, which is arranged in the first air outlet, a support rod is installed on the mounting cylinder, the support rod is connected to a center cylinder, a first mounting groove is opened on the center cylinder, a guide rod is installed on the center cylinder, the guide rod is arranged in the first mounting groove, a slider is slidably connected to the guide rod, 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 center cylinder, a movable rod is connected to the slider, a screw for controlling the movement of the movable rod is threadedly connected to the mounting cylinder, an opening and closing plate for controlling the air flow is hinged on the mounting cylinder, a first connecting rod is connected to the movable rod, and the first connecting rod is connected to the opening and closing plate; the first connecting rod is connected to an air guide plate for controlling the air flow direction.

[0008] In a specific feasible implementation scheme, the first connecting rod is connected to the second connecting rod, the second connecting rod is connected to the third connecting rod, the third connecting rod is installed with a sliding rod, the opening and closing plate is installed with a fixed plate, the fixed plate is provided with a first sliding groove, and the sliding rod is slidably connected to the fixed plate through the first sliding groove.

[0009] By adopting the above technical solution, before combustion, the staff rotates the screw to adjust the position of the screw. When the screw moves closer to the movable rod, the screw will push the movable rod to slide on the guide rod. When the movable rod moves, it will drive the first connecting rod, the second connecting rod and the third connecting rod to move. The sliding rod on the third connecting rod will slide in the first sliding groove on the fixed plate. The third connecting rod and the sliding rod will pull the opening and closing plate to rotate. By rotating the screw to change the position of the screw, the opening and closing degree of the opening and closing plate can be quickly adjusted, and the circulation of air at the first air outlet can be controlled, so that the flow rate of air flowing through the air guide hood can be quickly changed and adjusted, and the subsequent re-mixed air volume can be changed according to the flow rate of air filled into the external pipe, so that the staff can adjust the secondary mixed air flow according to the introduction ratio of air and gas, which is beneficial to enhance the performance of the burner and enhance the ability of mixing gas.

[0010] In a specific feasible implementation scheme, more than three first rotating rods are rotatably installed on the mounting tube, one end of the first rotating rod extends into the inner side of the mounting tube, and an air guide plate is installed on the end of the first rotating rod extending into the inner side of the mounting tube, and a second rotating rod is installed on the air guide plate, and the second rotating rod is rotatably installed on the central tube; the first rotating rod is connected to a first swing rod, a fourth connecting rod is hinged on the first swing rod, an end of the fourth connecting rod away from the first swing rod is hinged to another adjacent first swing rod, the first rotating rod is connected to a second swing rod, an end of the second swing rod away from the first rotating rod is hinged to a third swing rod, a fifth connecting rod is hinged on the third swing rod, and the fifth connecting rod is connected to the first connecting rod.

[0011] By adopting the above technical solution, when the screw is rotated to adjust the air flow rate, the first connecting rod will pull the fifth connecting rod to move, the fifth connecting rod will drag the third swing rod and the second swing rod to swing, the second swing rod pulls the first rotating rod to rotate, and the first rotating rod drives the air guide plate to rotate, so as to quickly adjust the inclination angle of the air guide plate, thereby changing the wind direction, making it easier for the air to be blown out and reflux on the return air duct, and at the same time, it can also make the air and the mixed gas form a certain angle of convection, which is convenient for mixing and enhancing the mixing effect. It is also possible to adjust the spacing between adjacent air guide plates, which changes with the change of the air volume at the inlet of the installation tube, which is conducive to enhancing the air circulation effect.

[0012] In a specific feasible implementation scheme, the mixed flow hood is configured as a pipe with an axial section having a truncated cone shape, one end of the mixed flow hood with a large diameter is fixedly connected to the annular plate, and one end of the mixed flow hood with a small diameter is arranged on the side of the annular plate away from the return air duct, and a first mixed flow hole group is provided on the side wall of the mixed flow hood, and the first mixed flow hole group is arranged along the axial direction of the mixed flow hood from the end with a small diameter to the end with a large diameter, and an end wall is provided at the end with a small diameter of the mixed flow hood, the inner through pipe is connected to the end wall, and a second air outlet is provided on the end wall.

[0013] In a specific possible implementation scheme, the gas outlet nozzle includes a single main gas outlet hole, which is opened on the end surface of the inner tube, and more than two secondary gas outlet holes are opened on the peripheral side wall of the gas outlet nozzle, and the secondary gas outlet holes are arranged around the main gas outlet hole.

[0014] By adopting the above technical solution, when the air passes through the air guide cover, a part of the air will enter the inner side of the mixed flow cover from the second air outlet and the mixed flow hole group on the mixed flow cover, and the gas will be introduced from the inner through pipe, and the gas will enter the inner side of the mixed flow cover through the main gas outlet and the secondary gas outlet and mix with the air, which is conducive to the mixing of air and fuel gas in stages. The mixed flow cover is set as a pipe with a truncated cone-shaped axial section, so that the air flowing into the mixed flow cover can form a certain angle of convection with the gas flowing out of the secondary gas outlet, which can enhance the mixing effect of air and gas.

[0015] In a specific embodiment, the axis of the secondary air outlet intersects with the axis of the primary air outlet.

[0016] By adopting the above technical solution, the secondary air outlet is opened at an angle, which can enhance the convection effect and the mixing effect.

[0017] In a specific feasible implementation scheme, the mixed flow cover is configured as a bell-mouth shaped pipe, the large-diameter end of the mixed flow cover is fixedly connected to the annular plate, the small-diameter end of the mixed flow cover is fixedly connected to the inner through pipe, and a second mixed flow hole group is opened on the mixed flow cover, and the second mixed flow hole group is arranged on the mixed flow cover from the small-diameter end of the mixed flow cover to the large-diameter end of the mixed flow cover.

[0018] In a specific possible implementation manner, the air outlet nozzle includes two or more first air outlet holes, which are opened on the end surface of the inner tube, and two or more second air outlet holes are opened on the side wall of the inner tube, which are opened radially.

[0019] By adopting the above technical solution and setting the mixed flow hood in a bell-mouth shape, the flame front and the return air duct area can be effectively isolated, preventing the risk of backflow when the flame fluctuates.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: 1. Air is introduced from the outer pipe. When the air passes through the air guide hood, part of the air will enter the inner side of the mixed flow hood from the mixing hood. Gas is introduced from the inner pipe. The gas will enter the inner side of the mixed flow hood and mix with the air. Another part of the air introduced from the outer pipe will flow through the air guide hood through the first air outlet position on the annular plate. The air flowing out from the first air outlet will impact on the inner wall of the return air duct, and the air and gas after reflux and mixing through the inner wall of the return air duct will be mixed again, which is beneficial to enhance the mixing effect. Because the combustion area is at the position of the air outlet of the return air duct, the fresh mixed gas can also be preheated by sucking high-temperature combustion products to form a continuous ignition source, which is beneficial to the step-by-step mixing of air and fuel gas, and is beneficial to eliminate the risks of backfire and spontaneous combustion, and can enhance the mixing effect of air and gas and the subsequent combustion effect of gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the burner of Example 1 of the present application.

[0022] Figure 2 It is a cross-sectional view of the burner of Example 1 of the present application.

[0023] Figure 3 It is a cross-sectional view of the air guide hood of Example 1 of the present application.

[0024] Figure 4 It is a schematic diagram of the control component of Example 1 of the present application.

[0025] Figure 5 It is a cross-sectional view of the control component of Example 1 of the present application.

[0026] Figure 6 Figure 5 Enlarged view of point A in the middle.

[0027] Figure 7 It is a schematic diagram of the connection relationship between the first swing arm and the second swing arm of Example 1 of the present application.

[0028] Figure 8 It is a schematic diagram of the installation position of the air guide plate of Example 1 of the present application.

[0029] Fig. 9 It is a cross-sectional view of the burner of Example 2 of the present application.

[0030] Fig.10 It is a cross-sectional view of the air guide hood of Example 2 of the present application.

[0031] Reference numerals: 1, external pipe; 11, return air pipe; 12, combustion port; 13, reinforcement plate; 2, air guide cover; 21, annular plate; 22, first air outlet; 23, mixing flow cover; 231, first mixing flow hole; 232, second mixing flow hole; 233, third mixing flow hole; 234, fourth mixing flow hole; 24, end wall; 241, second air outlet; 25, fifth mixing flow hole; 3, internal pipe; 31, air outlet nozzle; 311, main air outlet; 312, secondary air outlet; 313, first air outlet; 314, second air outlet; 4, control assembly; 41, mounting tube; 42 , support rod; 43, center tube; 431, first mounting groove; 441, screw; 442, guide rod; 443, slider; 444, spring; 445, movable rod; 446, first connecting rod; 447, second connecting rod; 448, third connecting rod; 449, slide rod; 45, opening and closing plate; 451, fixed plate; 452, first slide groove; 461, first rotating rod; 462, air guide plate; 463, second rotating rod; 464, first swing rod; 465, fourth connecting rod; 466, second swing rod; 467, third swing rod; 468, fifth connecting rod. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-10 This application is described in further detail.

[0033] Embodiment 1: The present application discloses a hydrogen-natural gas wide-range mixed combustion device for an industrial furnace, referring to Figure 1 and Figure 2 , including an outer through pipe 1 for letting in air, an air guide hood 2 is fixedly installed in the outer through pipe 1, and an inner through pipe 3 for letting in gas is fixedly connected to the air guide hood 2.

[0034] The end of the outer tube 1 is fixedly connected with a return air duct 11, which is configured as a pipe with a truncated cone shape in the axial section. The large-diameter end of the return air duct 11 is fixedly connected to the outer tube 1, and the small-diameter end of the return air duct 11 is a combustion port 12.

[0035] Reference Figure 2 and Figure 3The air guide cover 2 includes an annular plate 21, which is fixedly mounted on the inner wall of the outer tube 1. A reinforcing plate 13 is fixedly mounted on the inner wall of the outer tube 1. The reinforcing plate 13 is also fixedly connected to the annular plate 21. A first air outlet 22 is provided on the annular plate 21. A mixing flow cover 23 is fixedly connected to the annular plate 21. The mixing flow cover 23 is configured as a pipe with a truncated cone shape in the axial section. The large-diameter end of the mixing flow cover 23 is fixedly connected to the annular plate 21, and the small-diameter end of the mixing flow cover 23 is configured on the side of the annular plate 21 away from the return air duct 11. A first mixing flow hole group is provided on the side wall of the mixing flow cover 23. The first mixing flow hole group includes a plurality of first mixing flow holes 231. The plurality of first mixing flow holes 231 are arranged in a circumferential direction with the axis of the mixing flow cover 23 as the center.

[0036] An end wall 24 is provided at one end of the mixing hood 23 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 tube 3, and one end of the inner tube 3 passes through the end wall 24 and extends into the inner side of the mixing hood 23. The end of the inner tube 3 extending into the inner side of the mixing hood 23 is provided as an air outlet nozzle 31, and the air outlet nozzle 31 includes a single main air outlet hole 311, and the main air outlet hole 311 is provided on the end surface of the inner tube 3, and more than two secondary air outlet holes 312 are provided on the peripheral side wall of the air outlet nozzle 31, and the more than two secondary air outlet holes 312 are provided around the main air outlet hole 311, and the axis of the secondary air outlet hole 312 intersects with the axis of the main air outlet hole 311.

[0037] Air is introduced from the outer pipe 1. When the air passes through the air guide cover 2, part of the air will enter the inner side of the mixed flow cover 23 from the second air outlet 241 and the first mixed flow hole group on the mixed flow cover 23. Gas is introduced from the inner pipe 3. The gas will enter the inner side of the mixed flow cover 23 through the main gas outlet 311 and the secondary gas outlet 312 and mix with the air. Since the first mixed flow hole 231 is arranged in steps in the air intake direction due to the different diameters of the mixed flow cover 23, it is beneficial to mix the air and the fuel gas in stages, which is beneficial to eliminate the risk of backfire and spontaneous combustion. The mixed flow cover 23 is set as a pipe with a truncated cone shape in the axial section, and the secondary gas outlet 312 is opened obliquely, so that the air flowing in from the mixed flow cover 23 can form a certain angle of convection with the gas flowing out of the secondary gas outlet 312, which can enhance the mixing effect of air and gas.

[0038] Another part of the air introduced from the external passage 1 will flow through the air guide hood 2 through the first air outlet 22 on the annular plate 21, and the air flowing out from the first air outlet 22 will impact the inner wall of the return air duct 11, and will flow back through the inclined inner wall of the return air duct 11 to mix the mixed air and gas again, which is beneficial to enhance the mixing effect. Because the combustion area is at the combustion port 12 of the return air duct 11, the fresh mixed gas can also be preheated by entraining high-temperature combustion products to form a continuous ignition source.

[0039] Reference Figure 1 , Figure 4 , Figure 5 and Figure 6 A control component 4 for controlling the opening and closing of air at the first air outlet 22 and the air circulation amount is installed on the annular plate 21. The control component 4 includes a mounting cylinder 41, which is fixedly mounted on the annular plate 21 and arranged in the first air outlet 22. A support rod 42 is fixedly mounted on the inner wall of the mounting cylinder 41, a center cylinder 43 is fixedly mounted on the support rod 42, a screw 441 is threadedly connected to the inner wall of the center cylinder 43, a first mounting groove 431 is opened on the center cylinder 43, a guide rod 442 is fixedly mounted on the center cylinder 43, the guide rod 442 is arranged in the first mounting groove 431, a slider 443 is slidably mounted 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 center cylinder 43. A movable rod 445 is fixedly mounted on the slider 443. One end of the movable rod 445 close to the screw 441 abuts against the screw 441. One end of the movable rod 445 away from the screw 441 is fixedly mounted with a first connecting rod 446. The first connecting rod 446 passes through the mounting tube 41 and is slidably connected to the mounting tube 41. A second connecting rod 447 is fixedly mounted on the first connecting rod 446. The second connecting rod 447 is arranged on the outside of the mounting tube 41. The second connecting rod 447 passes through the annular plate 21 and is slidably connected to the annular plate 21. Four opening and closing plates 45 are hingedly mounted on the end of the mounting tube 41 away from the return air duct 11. The four opening and closing plates 45 are fan-shaped plates and are initially mounted on the mounting tube 41 in an open state. A fixed plate 451 is fixedly mounted on the opening and closing plate 45. A first sliding groove 452 is provided on the fixed plate 451. A third connecting rod 448 is fixedly mounted on one end of the second connecting rod 447 away from the first connecting rod 446 . A sliding rod 449 is fixedly mounted on the third connecting rod 448 . The sliding rod 449 is slidably mounted on the fixed plate 451 through a first sliding groove 452 .

[0040] Before burning, the staff rotates the screw rod 441 to adjust the position of the screw rod 441. When the screw rod 441 moves toward the movable rod 445, the screw rod 441 pushes the movable rod 445 to slide on the guide rod 442 and presses the spring 444. When the movable rod 445 moves, it drives the first connecting rod 446, the second connecting rod 447 and the third connecting rod 448 to move. The sliding rod 449 on the third connecting rod 448 slides in the first sliding groove 452 on the fixed plate 451. Rod 449 will pull the opening and closing plate 45 to rotate. By rotating the screw 441 to change the position of the screw 441, the opening and closing degree of the opening and closing plate 45 can be quickly adjusted to control the flow of air at the first air outlet 22, so that the flow of air flowing through the air guide hood 2 can be quickly changed and adjusted, and the amount of air that is subsequently mixed can be changed according to the flow of air filled into the external pipe 1, so that the staff can adjust the secondary mixed air flow according to the ratio of air and gas, which is beneficial to enhance the performance of the burner and enhance the ability of mixing gas.

[0041] Reference Figure 5 , Figure 7 and Figure 8 , more than three first rotating rods 461 are rotatably mounted on the mounting tube 41, one end of the first rotating rod 461 extends into the inner side of the mounting tube 41, and the other end extends out of the mounting tube 41, and an air guide plate 462 is fixedly mounted on the end of the first rotating rod 461 extending into the inner side of the mounting tube 41, and a second rotating rod 463 is fixedly mounted on the end of the air guide plate 462 away from the first rotating rod 461, and the second rotating rod 463 is rotatably mounted on the central tube 43. A first swing rod 464 is fixedly mounted on the end of the first rotating rod 461 extending out of the mounting tube 41, and a fourth connecting rod 465 is ball-jointedly connected to the first swing rod 464, and the end of the fourth connecting rod 465 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 rod 466 is fixedly mounted on the first rotating rod 461 , a third swing rod 467 is hingedly connected to one end of the second swing rod 466 away from the first rotating rod 461 , a fifth connecting rod 468 is hingedly connected to one end of the third swing rod 467 away from the second swing rod 466 , and the fifth connecting rod 468 is fixedly connected to the first connecting rod 446 .

[0042] When the air flow rate is adjusted by rotating the screw rod 441, the first connecting rod 446 will pull the fifth connecting rod 468 to move, the fifth connecting rod 468 will drag the third swing rod 467 and the second swing rod 466 to swing, the second swing rod 466 will pull the first rotating rod 461 to rotate, the first rotating rod 461 drives the air guide plate 462 to rotate, so as to quickly adjust the inclination angle of the air guide plate 462, when the first rotating rod 461 rotates, the first swing rod 464 will also rotate, the first swing rod 464 will pull the fourth connecting rod 465 to move, and the fourth connecting rod 465 will drive the other fourth first swing rods 464 to rotate, so as to pull all the air guide plates 462 to adjust the angle, change the wind direction, and facilitate the air to be blown out and reflux on the return air pipe 11, and at the same time, it can also make the air and the mixed gas form a certain angle of convection, which is convenient for mixing and enhancing the mixing effect. It is also possible to adjust the spacing between adjacent air guide plates 462, which changes with the change of the air volume at the inlet of the installation tube 41, which is conducive to enhancing the air circulation effect.

[0043] Embodiment 2: The difference between the present embodiment and embodiment 1 is that: Fig. 9 and Fig.10 The mixing flow cover 23 is configured as a trumpet-shaped pipe, the large-diameter end of the mixing flow cover 23 is fixedly connected to the annular plate 21, and the small-diameter end of the mixing flow cover 23 is fixedly connected to the inner through pipe 3. A second mixing flow hole group is opened on the mixing flow cover 23, and the second mixing flow hole group is composed of fifth mixing flow holes 25. The fifth mixing flow holes 25 are arranged in a straight line on the mixing flow cover 23 from the small-diameter end of the mixing flow cover 23 to the large-diameter end of the mixing flow cover 23.

[0044] The air outlet nozzle 31 includes two or more first air outlet holes 313 axially opened on the end surface of the inner tube 3 , and two or more second air outlet holes 314 radially opened on the side wall of the inner tube 3 .

[0045] The mixing hood 23 is configured in a bell-mouth shape, which can effectively isolate the flame front and the return air duct 11 area, thereby preventing the risk of backflow when the flame fluctuates.

[0046] The implementation principle of the embodiment of the present application is: air is introduced from the external pipe 1, and when the air passes through the air guide hood 2, a part of the air will enter the inner side of the mixing hood 23 from the mixing flow hood 23, and the fuel gas is introduced from the internal pipe 3, and the fuel gas will enter the inner side of the mixing flow hood 23 and mix with the air, which is beneficial to the separate mixing of air and fuel gas, is beneficial to eliminating the risks of backfire and spontaneous combustion, and can enhance the mixing effect of air and fuel gas.

[0047] Another part of the air introduced from the external passage 1 will flow through the air guide hood 2 through the first air outlet 22 on the annular plate 21, and the air flowing out from the first air outlet 22 will impact the inner wall of the return air duct 11, and will flow back through the inclined inner wall of the return air duct 11 to mix the mixed air and gas again, which is beneficial to enhance the mixing effect. Because the combustion area is at the combustion port 12 of the return air duct 11, the fresh mixed gas can also be preheated by entraining high-temperature combustion products to form a continuous ignition source.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hydrogen-natural gas wide-range mixed combustion device for industrial furnaces, characterized in that: The invention comprises an outer tube (1), the outer tube (1) being connected to a return air tube (11), one end of the return air tube (11) being away from the outer tube (1) being arranged as a combustion port (12), an air guide hood (2) being installed in the outer tube (1), the air guide hood (2) comprising an annular plate (21) connected to the outer tube (1), a first air outlet (22) being provided on the annular plate (21), a control component (4) for controlling the air flow rate of the first air outlet (22) being installed on the annular plate (21), a mixing hood (23) for mixing air and gas being installed on the annular plate (21), an inner tube (3) for introducing gas being connected to the mixing hood (23), one end of the inner tube (3) extending into the mixing hood (23), and one end of the inner tube (3) extending into the mixing hood (23) being an air outlet nozzle (31).

2. The hydrogen-natural gas wide-range mixed combustion device for industrial furnaces according to claim 1, characterized in that: The control assembly (4) comprises a mounting tube (41), the mounting tube (41) being arranged in the first air outlet (22), a support rod (42) being mounted on the mounting tube (41), the support rod (42) being connected to a center tube (43), the center tube (43) being provided with a first mounting groove (431), a guide rod (442) being mounted on the center tube (43), the guide rod (442) being arranged in the first mounting groove (431), a slider (443) being slidably connected to the guide rod (442), a spring (444) being sleeved on the guide rod (442), and the guide rod (442) being provided with a plurality of guide rods (443). One end of the spring (444) is connected to the slider (443), and the other end is connected to the center tube (43); a movable rod (445) is connected to the slider (443); a screw rod (441) for controlling the movement of the movable rod (445) is threadedly connected to the mounting tube (41); an opening and closing plate (45) for controlling the air flow is hingedly connected to the mounting tube (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); and an air guide plate (462) for controlling the air flow direction is connected to the first connecting rod (446).

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

4. The hydrogen-natural gas wide-range mixed combustion device for industrial furnaces according to claim 2, characterized in that: More than three first rotating rods (461) are rotatably mounted on the mounting tube (41), one end of the first rotating rod (461) extends into the inner side of the mounting tube (41), an air guide plate (462) is mounted on the end of the first rotating rod (461) extending into the inner side of the mounting tube (41), a second rotating rod (463) is mounted on the air guide plate (462), and the second rotating rod (463) is rotatably mounted on the central tube (43); the first rotating rod (461) is connected to a first swing rod (464), and the first swing rod (464) is connected to the first rotating rod (461). A fourth connecting rod (465) is hinged on the first rotating rod (461), one 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), one end of the second swing rod (466) away from the first rotating rod (461) is hinged to a third swing rod (467), a fifth connecting rod (468) is hinged on the third swing rod (467), and the fifth connecting rod (468) is connected to the first connecting rod (446).

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

6. The hydrogen-natural gas wide-range mixed combustion device for industrial furnaces according to claim 5, characterized in that: The air outlet nozzle (31) comprises a single main air outlet hole (311), the main air outlet hole (311) being opened on the end surface of the inner tube (3), and two or more secondary air outlet holes (312) being opened on the peripheral side wall of the air outlet nozzle (31), the secondary air outlet holes (312) being arranged around the main air outlet hole (311).

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

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

9. The hydrogen-natural gas wide-range mixed combustion device for industrial furnaces according to claim 8, characterized in that: The air outlet nozzle (31) comprises two or more first air outlet holes (313), the first air outlet holes (313) being opened on the end surface of the inner tube (3), and two or more second air outlet holes (314) being opened on the side wall of the inner tube (3), the second air outlet holes (314) being opened radially.

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