Accurate coal injection device for cement kiln

Abstract

The utility model provides a kind of cement kiln accurate coal injection device, including mutual nesting and by inside to outside for first pipe, second pipe, third pipe and fourth pipe, the side wall of the first pipe is provided with several spiral strips, the front end gap of the first pipe and second pipe is material outlet, the inboard of the first pipe is provided with first spiral blade, the second spiral blade is provided between the second pipe and third pipe, the side wall of the fourth pipe is provided with spherical surface, the outside of the fourth pipe is provided with two fixed plates of sleeve joint, and the middle part of fixed plate is provided with spherical recess, and spherical surface is slidably fitted in spherical recess. The utility model can adjust the conveying direction of pulverized coal, and each gas port is independently controlled, to realize the operation of accurate coal injection.

Description

Technical Field

[0001] This utility model relates to the field of pulverized coal conveying technology, and in particular to a precision pulverized coal injection device for cement kilns. Background Technology

[0002] Pulverized coal injection pipes are widely used and are very important in rotary kiln equipment. They are mainly used to feed coal and air to the kiln head of the rotary kiln. Their primary function is to reduce energy consumption and increase calcination output.

[0003] Based on the temperature distribution inside the kiln and the heating requirements, pulverized coal needs to be precisely delivered to designated areas. However, most existing pulverized coal injection pipes are relatively simple, mostly just a single pipe fitting. Pulverized coal is transported into the kiln along with air, and the location of the pulverized coal delivery in these pipes is mostly fixed. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses a precision pulverized coal injection device for cement kilns, comprising nested pipes consisting of a first pipe, a second pipe, a third pipe, and a fourth pipe arranged from the inside out.

[0005] The first pipe has several spiral blades on its sidewall. The gap between the front ends of the first and second pipes forms the material outlet. A second spiral blade is provided on the inner side of the first pipe, and a first spiral blade is provided between the second and third pipes. Pulverized coal is discharged from the material outlet, and simultaneously, the arrangement of the first and second spiral blades creates a cyclone that carries the pulverized coal out.

[0006] The fourth tube has a spherical surface on its sidewall. Two fixing plates are sleeved on the outer side of the fourth tube, and a spherical groove is provided in the middle of the fixing plate. The spherical surface slides in the spherical groove. The spherical surface and spherical groove facilitate the adjustment of the coal powder delivery direction. In addition, graphite powder can be filled between the spherical groove and the spherical surface for lubrication.

[0007] Preferably, the first pipe has a first air port at its tail end, the second pipe has a material port at its tail end, the third pipe has a third air port at its tail end, and the fourth pipe has a fourth air port at its tail end. The first, third, and fourth air ports are supplied with air independently, while the material port is used to feed in pulverized coal, which is fed in along with the high-speed airflow.

[0008] Preferably, the material inlet is fixedly connected to the side wall of the second pipe along the tangential direction, and the angle β between the axial direction of the material inlet and the axis of the second pipe is in the range of 30°-60°. This prevents coal powder from directly impacting the side wall of the second pipe and causing blockage.

[0009] Preferably, the side wall of the fixed plate is provided with several telescopic mechanisms, and the output end of each telescopic mechanism is rotatably connected to the side wall of the fourth pipe. The several telescopic mechanisms work together, i.e., the output end extends or retracts, to adjust the direction of coal powder delivery.

[0010] Preferably, a flow guide cap is fixedly connected to the back of the second spiral blade, a limit frame is fixedly connected to the front end of the third tube, and several support blocks are provided in the gap between the front ends of the first tube, the second tube, the third tube, and the fourth tube.

[0011] Preferably, the front end sidewall of the third pipe is conical, and the angle α between the side profile and the axis is less than 2°. This prevents the gas from the fourth pipe from affecting the conveying of pulverized coal, while the gas from the fourth pipe is used for insulation of the third pipe.

[0012] Preferably, the tail end of the first pipe is fixedly connected with an end cap, and the tail ends of the second, third, and fourth pipes are all provided with supporting sealing rings. This seals the tail ends of the pipe fittings.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The pipe can be adjusted by setting up a spherical surface, a fixed plate, and a telescopic mechanism. In addition, the first and second helical blades are set up to control the wind pressure of the cyclone and work together to help control the accuracy of coal powder conveying.

[0015] 2. Spiral strips, first spiral blades and second spiral blades that generate cyclones are provided on the side wall of the first pipe, so that the coal powder can be evenly dispersed after being transported.

[0016] 3. A fourth pipe is provided, and the gas delivered can insulate and dissipate heat at the front end of the third pipe. In addition, the side wall of the third pipe is conical to prevent the delivered gas from interfering with the coal powder being transported inside. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0018] Figure 2 This is an enlarged schematic diagram of the end of this utility model;

[0019] Figure 3 This is a schematic cross-sectional view of the end of the present invention;

[0020] Figure 4 This is a top view of the present invention;

[0021] Figure 5 This is a three-dimensional schematic diagram of the first tube of this utility model.

[0022] List of reference numerals in the attached diagram:

[0023] 1. End cap; 2. First pipe; 3. First air port; 4. Second pipe; 5. Material port; 6. Third pipe; 7. Third air port; 8. Fourth air port; 9. Fourth pipe; 10. Spherical surface; 11. Fixing plate; 12. Limiting frame; 13. First spiral blade; 14. Material outlet; 15. Second spiral blade; 16. Guide cap; 17. Telescopic mechanism; 18. Spiral strip. Detailed Implementation

[0024] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0025] like Figures 1 to 5 As shown, a precision pulverized coal injection device for a cement kiln includes nested pipes 2, 4, 6, and 9, arranged from the inside out. The gaps between the pipes are used for independent material conveying, which facilitates control of the conveying pressure.

[0026] The side wall of the first pipe 2 is provided with several spiral strips 18. The gap between the front ends of the first pipe 2 and the second pipe 4 is the material outlet 14. The spiral strips 18 are used to divide the coal powder fed into the first pipe 2 and the second pipe 4 to prevent coal powder from agglomerating or even piling up. In addition, the spiral structure makes the coal powder spiral after it is sent out, which is conducive to the uniform dispersion of the coal powder. The inner side of the first pipe 2 is provided with a second spiral blade 15. The second pipe 4 and the third pipe 6 are provided with a first spiral blade 13. The arrangement of the first spiral blade 13 and the second spiral blade 15 generates a cyclone that envelops the coal powder from both the inside and outside, which is conducive to the coal powder being transported to a distance. In addition, controlling the wind speed of the two cyclones can further control the dispersion range of the coal powder.

[0027] The side wall of the fourth pipe 9 is provided with a spherical surface 10, that is, a sphere is inserted and fixedly installed on the fourth pipe 9, and a through hole is provided in the sphere. The fourth pipe 9 passes through the through hole. Two fixing plates 11 are sleeved on the outside of the fourth pipe 9, and a spherical groove is provided in the middle of the fixing plate 11. The spherical surface 10 slides in the spherical groove. The spherical surface 10 and the spherical groove not only support the entire pipe structure, but also the sliding setting can change the inclination angle of the pipe, which facilitates changing the conveying direction of coal powder. In addition, graphite powder is filled between the spherical surface 10 and the spherical groove.

[0028] The first pipe 2 has a first gas port 3 at its tail end for independently pumping gas. The second pipe 4 has a material port 5 at its tail end for conveying coal powder along with the gas. Note that the coal powder is conveyed by the gas. The third pipe 6 has a third gas port 7 at its tail end for independently pumping gas. The fourth pipe 9 has a fourth gas port 8 at its tail end for independently pumping gas.

[0029] The material inlet 5 is fixedly connected to the side wall of the second pipe 4 along the tangential direction. The angle β between the axial direction of the material inlet 5 and the axis of the second pipe 4 is in the range of 30°-60° to prevent coal powder from directly impacting the side wall of the second pipe 4 and causing accumulation and blockage.

[0030] The side wall of the fixed plate 11 is provided with several telescopic mechanisms 17. The output end of the telescopic mechanism 17 is rotatably connected to the side wall of the fourth pipe 9. At least three telescopic mechanisms 17 are provided. When the telescopic mechanism 17 is activated in conjunction, the output end extends or retracts, thereby changing the orientation of the pipe, that is, changing the conveying direction of pulverized coal. In addition, by controlling the gas conveying of the first gas port 3 and the third gas port 7, the conveying of pulverized coal can be precisely controlled.

[0031] A flow guide cap 16 is fixedly connected to the back of the second spiral blade 15. The flow guide cap 16 has a structure with two ends, one end being a conical surface and the other end being a hemispherical surface, which allows the gas to be smoothly delivered from the second spiral blade 15. A limit frame 12 is fixedly connected to the front end of the third pipe 6. The limit frame 12 limits the first spiral blade 13 and the second spiral blade 15. Several support blocks are provided in the front end gaps of the first pipe 2, the second pipe 4, the third pipe 6, and the fourth pipe 9 to ensure the coaxiality between the pipes.

[0032] The front sidewall of the third pipe 6 is conical, and the angle α between the side profile and the axis is less than 2°, so as to avoid the gas delivered by the fourth pipe 9 from interfering with the conveying of pulverized coal. The gas delivered by the fourth pipe 9 is mainly used for heat insulation and heat dissipation at the front end of the third pipe 6.

[0033] The end cap 1 is fixedly connected to the tail end of the first pipe 2 to seal the tail end of the first pipe 2. The tail ends of the second pipe 4, the third pipe 6 and the fourth pipe 9 are all provided with supporting sealing rings. In addition, through holes are opened on the side wall of the pipes, and bolts are threaded through the through holes and connected to the supporting sealing rings.

[0034] The technical means disclosed in this utility model are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A precision pulverized coal injection device for a cement kiln, characterized in that, It includes a series of tubes nested together, arranged from the inside out as the first tube (2), the second tube (4), the third tube (6), and the fourth tube (9); The side wall of the first tube (2) is provided with a plurality of spiral strips (18), the front end gap between the first tube (2) and the second tube (4) is the material outlet (14), the inner side of the first tube (2) is provided with a second spiral blade (15), and the second tube (4) and the third tube (6) are provided with a first spiral blade (13). The side wall of the fourth tube (9) is provided with a spherical surface (10), and two fixing plates (11) are sleeved on the outer side of the fourth tube (9). A spherical groove is provided in the middle of the fixing plate (11), and the spherical surface (10) slides in the spherical groove.

2. The precision pulverized coal injection device for a cement kiln according to claim 1, characterized in that: The first pipe (2) is provided with a first air port (3) at its tail end, the second pipe (4) is provided with a material port (5) at its tail end, the third pipe (6) is provided with a third air port (7) at its tail end, and the fourth pipe (9) is provided with a fourth air port (8) at its tail end.

3. The precision pulverized coal injection device for a cement kiln according to claim 2, characterized in that: The material inlet (5) is fixedly connected to the side wall of the second pipe (4) along the tangential direction, and the angle β between the axial direction of the material inlet (5) and the axis of the second pipe (4) is in the range of 30°-60°.

4. The precision pulverized coal injection device for a cement kiln according to claim 1, characterized in that: The side wall of the fixed plate (11) is provided with several telescopic mechanisms (17), and the output end of the telescopic mechanism (17) is rotatably connected to the side wall of the fourth tube (9).

5. The precision pulverized coal injection device for a cement kiln according to claim 1, characterized in that: The back of the second spiral blade (15) is fixedly connected to a flow guide cap (16), and the front end of the third tube (6) is fixedly connected to a limit frame (12). Several support blocks are provided in the gap between the front ends of the first tube (2), the second tube (4), the third tube (6), and the fourth tube (9).

6. The precision pulverized coal injection device for a cement kiln according to claim 1, characterized in that: The front end sidewall of the third tube (6) is a conical surface, and the angle α between the side profile and the axis is less than 2°.

7. The precision pulverized coal injection device for a cement kiln according to claim 1, characterized in that: The tail end of the first tube (2) is fixedly connected with an end cap (1), and the tail ends of the second tube (4), the third tube (6) and the fourth tube (9) are all provided with supporting sealing rings.

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