Kiln head combustion device

Abstract

The utility model discloses a kiln head combustion device, which is applied to the technical field of kiln head combustors and comprises a kiln head pipe, one end of the kiln head pipe is in bolted connection with a fan, and the kiln head pipe is communicated with the output end of the fan. The cone-shaped abutting block is driven by the resilience force of the spring to block the narrow opening section again through a kiln head combustor disconnection machine, and the combustion cavity and the mixing cavity are sealed. Therefore, flames can be prevented from flowing into the mixing cavity on the side where residual oxygen and pulverized coal still exist, damage to equipment caused by backflow of the flames in a kiln head burner pipeline is avoided, and safety is improved. And the rotating shaft and the first mixing fan blades generate rotation in opposite different directions to disturb air. And meanwhile, the central position of the first mixing fan blade pipeline and the rotating shaft correspond to the edge position of the pipeline, so that the turbulent flow position has no dead angle, the mixing effect of pulverized coal and air in the kiln head combustor pipeline is improved, and the pulverized coal combustion efficiency is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of kiln head burners, in particular to a kiln head burning device. Background Art

[0002] The kiln head combustion device is a key equipment in the cement production process, mainly used to provide the heat required for combustion in the kiln head part of the rotary kiln.

[0003] At present, the Chinese utility model with the publication number CN220892253U discloses a kiln head burner, which relates to the technical field of burners, including an ignition tube, one end of the ignition tube is connected to a filter box, the other end of the filter box is connected to a combustion-supporting tube, and the other end of the combustion-supporting tube is connected to a blower pump; a gas pipe is connected in the ignition tube, an exhaust disk is provided at the gas outlet end of the gas pipe, an igniter is fixedly provided at the other end of the exhaust disk, and an air volume regulating component is provided in the combustion-supporting tube. By arranging the air volume regulating component in the combustion-supporting tube, the cylinder drives the air control plate to adjust up and down, which can effectively control the air volume and air pressure blown into the combustion-supporting tube by the blower pump, and utilizes the pressure difference of the combustion-supporting air to suck back part of the flue gas and enter the recycling. Since the flue gas is burning in a circulation, the heat capacity of the flue gas is large, the combustion temperature is reduced, and NOx is reduced. Since the flue gas enters the recycling and joins the combustion process, it has the dual effects of suppressing NOx and saving energy.

[0004] The existing kiln head combustion device uses a fan to drive the coal powder forward in the pipeline to ignite and burn. Because it is electrically driven, after the kiln head burner loses power, the coal powder lacks wind propulsion, and the coal powder does not stop burning immediately. Therefore, the flame can easily burn back along the coal powder remaining inside the pipeline, causing flame reflux and damage to the kiln head burner. At the same time, after the coal powder enters the pipeline, the kiln head burner needs to be mixed with the air to fully burn. The existing kiln head burner will be installed with spoiler blades to disturb the air. However, the spoiler blades can only disturb the air inside the pipeline in one direction, and the overall turbulence effect is poor, which cannot ensure that the coal powder and air are fully mixed. Utility Model Content

[0005] The utility model aims to provide a kiln head combustion device, which has the advantages of preventing flame backflow inside the kiln head burner pipe and improving the mixing effect of coal powder and air inside the kiln head burner pipe.

[0006] The above-mentioned technical objectives of the present utility model are achieved through the following technical solutions: a kiln head combustion device, comprising a kiln head pipe, one end of the kiln head pipe is bolted to a fan, the kiln head pipe is connected to the output end of the fan, a pulverized coal tank is provided at the top of the kiln head pipe near the fan, the bottom of the pulverized coal tank is fixedly connected to a connecting pipe fixedly connected to the kiln head pipe, a mixing chamber is provided inside the kiln head pipe near the fan end, a combustion chamber is provided inside the kiln head pipe away from the fan end, a narrow section is provided between the combustion chamber and the mixing chamber, a first support frame welded to the kiln head pipe is provided at the end of the combustion chamber near the narrow section, a telescopic rod is bolted to the side of the first support frame near the narrow section, a conical block slidably plugged into the narrow section is fixedly connected to the side of the telescopic rod away from the first support frame, and the surface of the telescopic rod is provided with a spring fixedly connected to the first support frame and the conical block.

[0007] By adopting the above technical solution, the rebound force of the spring is used to drive the conical stopper to block the narrow section again through the cut-off telephone of the kiln head burner, thereby sealing the combustion chamber and the mixing chamber. This can prevent the flame from flowing into the mixing chamber on the side where residual oxygen and coal powder still exist, avoid the flame backflow inside the kiln head burner pipe from damaging the equipment, and improve safety. The air is disturbed by rotating in opposite directions by the rotating shaft and the first mixing blade. At the same time, the first mixing blade is positioned at the center of the pipe and the rotating shaft is positioned at the edge of the pipe, so that there are no dead angles in the disturbance position, thereby improving the effect of mixing coal powder and air inside the kiln head burner pipe and ensuring the combustion efficiency of coal powder.

[0008] The utility model is further configured as follows: a second support frame and a third support frame welded to the kiln head pipe are respectively provided at one end of the mixing chamber close to the narrow mouth section, the second support frame is internally connected to a rotating shaft for rotation, and the first mixing fan blade is bolted to one end of the rotating shaft away from the third support frame.

[0009] By adopting the above technical solution, the air sucked in by the fan is used to drive the first mixing blade to rotate, so that no additional power is required.

[0010] The present invention is further configured as follows: a fixed shaft rotatably connected to the rotating shaft is welded to one end of the third support frame close to the second support frame, a first gear is fixedly sleeved on the surface of the fixed shaft, fixed rods are welded on both sides of the surface of the rotating shaft, a rotating rod is rotatably connected through the interior of the fixed rod, a second gear meshing with the first gear is fixedly sleeved on the surface of the rotating rod, and a second mixing blade is bolted to one end of the rotating rod close to the third support frame.

[0011] The above technical solution is adopted to improve the mixing effect of pulverized coal and air inside the kiln head burner pipe, thereby ensuring the combustion efficiency of pulverized coal.

[0012] The utility model is further configured as follows: an ignition device bolted to the kiln head pipe is provided at one end of the top of the inner cavity of the combustion chamber close to the narrow mouth section, and the ignition device is a spark plug.

[0013] By adopting the above technical solution, the air and pulverized coal mixed in the combustion chamber are ignited by a spark plug, thereby improving ignition safety.

[0014] The utility model is further configured as follows: the surface of the inner cavity of the mixing chamber is provided with a heat-insulating lining bolted to the kiln head pipe.

[0015] By adopting the above technical solution, the interior of the mixing chamber is kept warm to reduce heat loss.

[0016] The utility model is further configured as follows: a connecting flange is fixedly sleeved on the surface of one end of the kiln head pipe close to the mixing chamber.

[0017] By adopting the above technical solution, one end of the kiln head pipe can be easily installed on the kiln head opening, so that the one end of the kiln head pipe can penetrate into the interior of the rotary kiln.

[0018] The utility model is further configured as follows: a baffle is slidably connected to the interior of the connecting pipe, and one side of the baffle is rotatably connected to a threaded rod that is threadedly connected to the connecting pipe.

[0019] By adopting the above technical solution, the threaded rod is screwed to engage with the thread of the connecting pipe, thereby pushing the baffle to slide inside the connecting pipe, thereby controlling the opening and closing of the internal channel of the connecting pipe.

[0020] In summary, the present invention has the following beneficial effects:

[0021] 1. By disconnecting the kiln head burner, the spring's rebound force drives the conical stopper to re-block the narrow section, sealing the combustion chamber and the mixing chamber. This prevents the flame from flowing into the mixing chamber where residual oxygen and pulverized coal still exist, thus preventing the flame from flowing back into the kiln head burner pipe and causing damage to the equipment, thereby improving safety.

[0022] 2. The rotating shaft and the first mixing blade rotate in opposite directions to turbulent the air. At the same time, the first mixing blade should be positioned at the center of the pipe, and the rotating shaft should be positioned at the edge of the pipe, so that there are no blind spots in the turbulent flow, thereby improving the mixing effect of pulverized coal and air inside the kiln head burner pipe and ensuring pulverized coal combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 It is a cross-sectional view of the structure of the utility model;

[0025] Figure 3It is a side view of the local structure of the utility model;

[0026] Figure 4 This utility model Figure 2 A magnified view of point A in the figure;

[0027] Figure 5 This utility model Figure 2 Enlarged view of point B in .

[0028] Figure numerals: 1. kiln head pipe; 2. fan; 3. pulverized coal tank; 4. connecting pipe; 5. combustion chamber; 6. mixing chamber; 7. narrow section; 8. first support frame; 9. telescopic rod; 10. spring; 11. conical block; 12. second support frame; 13. third support frame; 14. rotating shaft; 15. first mixing blade; 16. fixed shaft; 17. fixed rod; 18. rotating rod; 19. first gear; 20. second gear; 21. second mixing blade; 22. thermal insulation lining; 23. ignition device; 24. connecting flange; 25. baffle; 26. threaded rod. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below with reference to the accompanying drawings.

[0030] Example 1:

[0031] refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 A kiln head combustion device comprises a kiln head pipe 1, one end of the kiln head pipe 1 is bolted with a fan 2, the kiln head pipe 1 is connected with the output end of the fan 2, a coal powder tank 3 is provided at the end of the top of the kiln head pipe 1 near the fan 2, and the bottom of the coal powder tank 3 is fixedly connected with a connecting pipe 4 fixedly connected with the kiln head pipe 1, a mixing chamber 6 is provided inside the kiln head pipe 1 near the end of the fan 2, a combustion chamber 5 is provided at the end of the kiln head pipe 1 away from the fan 2, a narrow section 7 is provided between the combustion chamber 5 and the mixing chamber 6, a first support frame 8 welded to the kiln head pipe 1 is provided at one end of the combustion chamber 5 near the narrow section 7, a telescopic rod 9 is bolted to the side of the first support frame 8 near the narrow section 7, and a conical block 11 slidably plugged with the narrow section 7 is fixedly connected to the side of the telescopic rod 9 away from the first support frame 8, and a spring 10 fixedly connected to the first support frame 8 and the conical block 11 is provided on the surface of the telescopic rod 9. By disconnecting the kiln head burner, the spring 10's rebound force drives the conical stopper 11 to re-block the narrow section 7, sealing the combustion chamber 5 and the mixing chamber 6. This prevents the flame from flowing into the mixing chamber 6 where residual oxygen and pulverized coal still exist, thus preventing damage to the equipment caused by flame backflow inside the kiln head burner pipe and improving safety.

[0032] refer to Figure 1 、 Figure 2An ignition device 23 is provided at one end of the combustion chamber 5 near the narrow section 7 and is bolted to the kiln head pipe 1. The ignition device 23 is a spark plug. The spark plug ignites the air and coal powder mixed inside the combustion chamber 5, improving ignition safety.

[0033] refer to Figure 1 、 Figure 2 The surface of the kiln head pipe 1 near one end of the mixing chamber 6 is fixedly sleeved with a connecting flange 24. It is convenient to install one end of the kiln head pipe 1 on the kiln head opening so that one end of the kiln head pipe 1 can penetrate into the interior of the rotary kiln.

[0034] A brief description of the usage process: Insert the end of the kiln head pipe 1 away from the fan 2 into the kiln head and seal it. Then turn on the fan 2 to suck the outside air into the kiln head pipe 1. At the same time, open the connecting pipe 4 so that the coal powder in the coal powder tank 3 can fall into the kiln head pipe 1, so that the air and coal powder are mixed in the mixing chamber 6 inside the kiln head pipe 1. After that, enter the interior of the combustion chamber 5 through the narrow section 7 and turn on the ignition device 23 to ignite the coal powder, so that the flame goes out from the other end of the kiln head pipe 1 and burns the kiln head. When the air and coal powder enter the narrow section 7, the air will generate pressure on the conical block 11, thereby overcoming the elastic force of the spring 10, pushing the spring 10 to contract, connecting the narrow section 7 and the combustion chamber 5, and allowing the air and coal powder to flow normally. When the kiln head burner is powered off, the fan 2 stops working. At this time, the air can no longer provide thrust. The conical block 11 can be driven by the rebound force of the spring 10 to block the conical block 11 on one side of the narrow section 7 again, thereby sealing the combustion chamber 5 and the mixing chamber 6 and preventing the flame from flowing into the interior of the mixing chamber 6.

[0035] Example 2:

[0036] refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4A kiln head combustion device, wherein a second support frame 12 and a third support frame 13 welded to the kiln head pipe 1 are respectively provided at one end of the mixing chamber 6 near the narrow mouth section 7. The second support frame 12 is rotatably connected to a rotating shaft 14 inside. A first mixing blade 15 is bolted to the end of the rotating shaft 14 away from the third support frame 13. A fixed shaft 16 rotatably connected to the rotating shaft 14 is welded to the end of the third support frame 13 near the second support frame 12. A first gear 19 is fixedly sleeved on the surface of the fixed shaft 16. Fixed rods 17 are welded on both sides of the surface of the rotating shaft 14. A rotating rod 18 is rotatably connected to the interior of the fixed rod 17. A second gear 20 meshing with the first gear 19 is fixedly sleeved on the surface of the rotating rod 18. A second mixing blade 21 is bolted to the end of the rotating rod 18 near the third support frame 13. The rotating shaft 14 and the first mixing blade 15 generate rotations in opposite directions to turbulent the air. At the same time, the first mixing fan blade 15 should be positioned at the center of the pipeline and the rotating shaft 14 should be positioned at the edge of the pipeline, so that there is no dead angle in the turbulence position, thereby improving the mixing effect of coal powder and air inside the kiln head burner pipeline and ensuring the combustion efficiency of coal powder.

[0037] refer to Figure 2 、 Figure 5 The surface of the inner cavity of the mixing chamber 6 is provided with a thermal insulation lining 22 bolted to the kiln head pipe 1. The interior of the mixing chamber 6 is kept warm to reduce heat loss.

[0038] refer to Figure 2 The interior of the connecting tube 4 is slidably connected to a baffle 25, and one side of the baffle 25 is rotatably connected to a threaded rod 26 that is threadedly connected to the connecting tube 4. By twisting the threaded rod 26 and engaging the thread of the connecting tube 4, the baffle 25 is pushed to slide inside the connecting tube 4, controlling the opening and closing of the internal passage of the connecting tube 4.

[0039] A brief description of the operating process: Air and pulverized coal enter the mixing chamber 6. During the air flow, the first mixing blades 15 drive the rotating shaft 14 to rotate. The first mixing blades 15 can unidirectionally disturb the air and pulverized coal. At the same time, the rotation of the rotating shaft 14 drives the rotating rod 18 to revolve around the center of the rotating shaft 14, causing the second gear 20 to engage with the fixed first gear 19. As a result, the rotating rod 18, supported by the fixed rod 17, rotates in the opposite direction of the rotating shaft 14. This then drives the second mixing blades 21 in the opposite direction of the first mixing blades 15 to disturb the air and pulverized coal, allowing the air and pulverized coal to be fully mixed inside the mixing chamber 6 before entering the combustion chamber 5 for combustion.

[0040] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A kiln head combustion device, comprising a kiln head pipe (1), characterized in that: One end of the kiln head pipe (1) is bolted to a fan (2), and the kiln head pipe (1) is connected to the output end of the fan (2). A pulverized coal tank (3) is provided at the top of the kiln head pipe (1) near the fan (2). The bottom of the pulverized coal tank (3) is fixedly connected to a connecting pipe (4) fixedly connected to the kiln head pipe (1). A mixing chamber (6) is provided inside the kiln head pipe (1) near the fan (2). A combustion chamber (5) is provided inside the kiln head pipe (1) away from the fan (2). The combustion chamber (5) and the mixing chamber ( 6), a narrow section (7) is provided between the combustion chamber (5), a first support frame (8) welded to the kiln head pipe (1) is provided at one end of the combustion chamber (5) near the narrow section (7), a telescopic rod (9) is bolted to the side of the first support frame (8) near the narrow section (7), a conical stop block (11) slidably plugged into the narrow section (7) is fixedly connected to the side of the telescopic rod (9) away from the first support frame (8), and a spring (10) is sleeved on the surface of the telescopic rod (9) and fixedly connected to the first support frame (8) and the conical stop block (11).

2. A kiln head combustion device according to claim 1, characterized in that: A second support frame (12) and a third support frame (13) welded to the kiln head pipe (1) are respectively provided at one end of the mixing chamber (6) near the narrow mouth section (7); a rotating shaft (14) is rotatably connected to the inside of the second support frame (12); and a first mixing fan blade (15) is bolted to one end of the rotating shaft (14) away from the third support frame (13).

3. A kiln head combustion device according to claim 2, characterized in that: A fixed shaft (16) rotatably connected to the rotating shaft (14) is welded to one end of the third support frame (13) close to the second support frame (12); a first gear (19) is fixedly sleeved on the surface of the fixed shaft (16); fixed rods (17) are welded on both sides of the surface of the rotating shaft (14); a rotating rod (18) is rotatably connected to the interior of the fixed rod (17); a second gear (20) meshing with the first gear (19) is fixedly sleeved on the surface of the rotating rod (18); and a second mixing blade (21) is bolted to one end of the rotating rod (18) close to the third support frame (13).

4. The kiln head combustion device according to claim 1, characterized in that: An ignition device (23) bolted to the kiln head pipe (1) is provided at one end of the inner cavity top of the combustion chamber (5) close to the narrow mouth section (7), and the ignition device (23) is a spark plug.

5. The kiln head combustion device according to claim 1, characterized in that: The surface of the inner cavity of the mixing chamber (6) is provided with a heat-insulating lining (22) bolted to the kiln head pipe (1).

6. The kiln head combustion device according to claim 1, characterized in that: A connecting flange (24) is fixedly sleeved on the surface of one end of the kiln head pipe (1) close to the mixing chamber (6).

7. The kiln head combustion device according to claim 1, characterized in that: A baffle (25) is slidably connected to the interior of the connecting pipe (4), and a threaded rod (26) threadedly connected to the connecting pipe (4) is rotatably connected to one side of the baffle (25).

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