Feeding structure of rotary kiln

Abstract

The utility model provides a feeding structure of a rotary kiln, and relates to the technical field of rotary kilns. A rotary kiln feeding structure comprises a cyclone cylinder, a discharging pipe, a smoke chamber and a rotary kiln which are communicated in sequence, the smoke chamber and the rotary kiln are communicated to form a joint, the joint is sleeved with a sealing fish scale, and the end, away from the cyclone cylinder, of the discharging pipe penetrates through the side wall of the smoke chamber and obliquely extends in the gravity direction to be arranged in the smoke chamber. The utility model aims to provide a feeding structure of a rotary kiln, which can reduce the dispersion degree of materials entering a smoke chamber and prevent the materials from being retained at the joint of the rotary kiln and the smoke chamber, so that the phenomenon of material leakage at the tail of the rotary kiln is relieved, and the cleaning and maintenance frequency is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a rotary kiln feeding structure. Background Art

[0002] In the cement clinker production process, raw materials undergo pre-decomposition in the decomposition furnace before entering a cyclone for cyclonic separation. The separated materials then flow through a discharge pipe from the smoke chamber into a rotary kiln for calcination. The connection between the rotary kiln and the smoke chamber is sealed with scales on the outside to prevent leakage within the rotary kiln system. However, in actual operation, the drop between the discharge pipe inlet and outlet is high, and the kinetic energy of the material increases as it falls. The strong impact forces the material into the smoke chamber in a dispersed state. Some of the material can impact the side of the connection between the rotary kiln and the smoke chamber, weakening the sealing mechanism and allowing material to leak from that location. This not only affects the atmospheric environment but also increases the material temperature, posing a safety hazard.

[0003] Patent No. CN203881119U is a discharging device for preventing leakage at the tail of a rotary kiln. The utility model provides a discharging chute at the bottom of the discharging slope of the kiln tail smoke chamber, and a discharging pipe is connected to the lower end of the discharging chute to promptly remove the material retained at the rotary kiln, thereby ensuring that the elasticity of the fish scales at the kiln tail does not deform, so that it can effectively contact with the friction ring to avoid leakage. It only cleans up the retained material in a timely manner and protects the elasticity of the fish scales at the kiln tail, while also reducing the safety hazards caused by high-temperature materials. It does not solve the problem of material splashing from the inside, that is, it does not fundamentally reduce the impact of materials on the joints, but only provides remedial measures when material is retained after the impact.

[0004] In summary, it is necessary to propose a rotary kiln feeding structure to solve the problem of material retention caused by material collision at the joint due to the degree of dispersion of the material when it exits the pipe. Utility Model Content

[0005] The purpose of the utility model is to provide a rotary kiln feeding structure, which can reduce the dispersion of materials entering the smoke chamber, avoid material retention at the connection between the rotary kiln and the smoke chamber, and thus slow down the leakage of materials at the tail of the rotary kiln and reduce the frequency of cleaning and maintenance.

[0006] The embodiment of the present utility model is achieved as follows:

[0007] A rotary kiln feeding structure includes a cyclone, a discharge pipe, a smoke chamber and a rotary kiln connected in sequence. The smoke chamber and the rotary kiln are connected to form a joint, and a sealing fish scale is provided at the joint. The discharge pipe passes through the side wall of the smoke chamber at one end away from the above-mentioned cyclone and extends obliquely along the direction of gravity to be placed inside the smoke chamber.

[0008] This design can, to a certain extent, gather the fallen materials, reduce the height of the space where the materials are scattered, reduce the degree of dispersion of the materials out of the pipe, and reduce the probability of splashing to the connection between the smoke chamber and the rotary kiln, thereby reducing the possibility of materials entering the sealing fish scales. The solution to the problem of material retention can prevent the retained materials from being retained in the sealing fish scales for a long time, causing the elastic sealing fish scales to lose their sealing effect. It can reduce the probability of high-temperature material leakage from the root, reduce safety hazards, and reduce the frequency of personnel cleaning and maintenance.

[0009] In some technical solutions of the present invention, the above-mentioned discharge pipe is bent toward the cyclone with a first set amplitude to form a first corner, and is bent toward the smoke chamber with a second set amplitude at a certain distance to form a second corner. The first set amplitude and the second set amplitude are both used to slow down the flow speed of the material in the discharge pipe.

[0010] This design can reduce the speed of the material from the discharge port of the cyclone 1 to the discharge pipe outlet, reduce the degree of dispersion of the material when it leaves the pipe, and reduce the probability of it entering the connection point 5.

[0011] In some technical solutions of the present invention, the above-mentioned discharge pipe includes a first corner, and the degree of the first corner is 120 degrees.

[0012] If the degree of the first corner is changed to 120 degrees, the speed of the material from the discharge port of the cyclone to the discharge pipe outlet will be reduced, and the speed and force of the material splashing out of the pipe will be reduced, further ensuring the normal reflux of the material in the concave groove and reducing the probability of leakage in the rotary kiln.

[0013] In some technical solutions of the present invention, the above-mentioned discharge pipe also includes a second corner, the second corner is close to the above-mentioned smoke chamber, and the degree of the second corner is 150 degrees.

[0014] Whether the second corner is set on the basis of the first corner or separately, the falling speed of the material is changed to a certain extent, further ensuring the normal reflux of the material in the concave trough and no longer leaking the rotary kiln.

[0015] In some technical solutions of the present invention, the rotary kiln is provided with a reflux piece and a refractory brick layer, the reflux piece includes a plurality of concave reflux grooves arranged in a ring shape, a kiln mouth annular guard plate is provided between the reflux piece and the refractory brick layer, and the inner diameter of the kiln mouth annular guard plate is smaller than the inner diameter of the reflux piece.

[0016] In this structure, since the inner diameter of the annular guard plate at the reflux kiln mouth is smaller than the inner diameter of the reflux piece, the reflux of materials in the rotary kiln can be slowed down.

[0017] In some technical solutions of the present invention, the ring width of the above-mentioned kiln mouth annular guard plate is 400 mm.

[0018] Compared with the current 300mm, it can further prevent material backflow without affecting the feeding.

[0019] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: the material discharge pipe is extended and placed inside the smoke chamber, which plays a role in gathering the material, reducing the degree of dispersion of the material out of the pipe, reducing the probability of material entering the joint, and thereby reducing the material from entering the sealing fish scales, fundamentally slowing down the damage to the sealing fish scales, reducing the probability of leakage of high-temperature materials, ensuring the safety of the staff, reducing the frequency of cleaning and maintenance, and ensuring the smooth operation of the production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural schematic diagram of a rotary kiln feeding structure according to an embodiment of the present utility model.

[0022] Icons: 1-cyclone; 2-feeding pipe; 3-smoke chamber; 4-rotary kiln; 5-connection; 6-sealing fish scale; 7-first corner; 8-second corner; 9-reflux part; 10-refractory brick layer; 11-kiln mouth annular guard plate; 12-concave reflux trough. DETAILED DESCRIPTION

[0023] Example

[0024] Please refer to Figure 1 A rotary kiln feeding structure includes a cyclone 1, a discharge pipe 2, a smoke chamber 3 and a rotary kiln 4 connected in sequence. The smoke chamber 3 and the rotary kiln 4 are connected to form a connection 5, and the connection 5 is provided with a sealing fish scale 6. The discharge pipe 2 passes through the side wall of the smoke chamber 3 at one end away from the above-mentioned cyclone 1 and extends obliquely along the direction of gravity to be placed inside the smoke chamber 3.

[0025] The principle of the feeding device is as follows: the material enters the cyclone 1 for cyclonic separation, and the separated material relies on its own gravity to enter the smoke chamber 3 along the discharge pipe 2, and falls at the outlet of the discharge pipe 2 located in the lower middle part of the smoke chamber 3. Compared with the falling material in the traditional structure, this design method can, to a certain extent, play a role in gathering the falling material, the height of the space where the material is scattered becomes smaller, the degree of dispersion of the material out of the pipe is reduced, and the probability of splashing to the connection point 5 between the smoke chamber 3 and the rotary kiln 4 is reduced, thereby reducing the possibility of the material entering the sealing fish scale 6. The solution to the problem of material retention can avoid the retained material from being retained in the sealing fish scale 6 for a long time, causing the elastic sealing fish scale 6 to lose its sealing effect, which can reduce the probability of high-temperature material leakage from the root, reduce safety hazards, and reduce the frequency of personnel cleaning and maintenance.

[0026] As a preferred embodiment, the above-mentioned discharge pipe is bent toward the cyclone 1 with a first set amplitude to form a first corner 7, and is bent toward the smoke chamber 3 with a second set amplitude at a certain distance to form a second corner 8. The first set amplitude and the second set amplitude are both used to slow down the flow speed of the material in the discharge pipe 2.

[0027] In the above embodiment, the first set amplitude is the bending angle value of the first corner, and the second set amplitude is the bending angle value of the second corner; the first set amplitude is reduced relative to the existing set amplitude of 130°, and the second set amplitude is reduced relative to the existing set amplitude of 160°. The speed of the material from the discharge port of the cyclone 1 to the discharge pipe outlet will be reduced, and the degree of dispersion of the material when it exits the pipe will be reduced, reducing the probability of it entering the connection point 5.

[0028] As a preferred embodiment, the angle of the first corner 7 is 120 degrees.

[0029] In the above embodiment, the discharge pipe 2 is bent to form the first corner 7; the current bending angle of the discharge pipe 2 is generally 130 degrees, and the slope is relatively large, which makes the material fall at a higher speed. If it is changed to 120 degrees, the speed of the material from the discharge port of the cyclone 1 to the outlet of the discharge pipe 2 will be reduced, and the speed and force of the material when splashing out of the pipe will be reduced, further ensuring the normal reflux of the material in the concave groove and reducing the probability of leakage of the rotary kiln 4.

[0030] As a preferred embodiment, the angle of the second corner 8 is 150 degrees.

[0031] In the above embodiment, whether it is the first corner 7 or the second corner 8, the falling speed of the material is changed to a certain extent, further ensuring the normal reflux of the material in the concave trough, and the rotary kiln 4 no longer leaks material; it is worth noting that the discharge pipe 2 can be a whole pipe bent to form the first corner 7 or the second corner 8, or it can be formed by three steel pipes welded according to the angle requirements.

[0032] As a preferred embodiment, the rotary kiln 4 is provided with a reflux piece 9 and a refractory brick layer 10. The reflux piece 9 includes a plurality of annularly arranged concave reflux grooves 12. A kiln mouth annular guard plate 11 is provided between the reflux piece 9 and the refractory brick layer 10. The inner diameter of the kiln mouth annular guard plate 11 is smaller than the inner diameter of the reflux piece 9.

[0033] In the above embodiment, the reflow member 9 belongs to the existing mechanical structure of the rotary kiln 4, and the connection point 5 is the concave groove material reflux position. After the material enters the concave reflow groove 12 in the reflow member 9, the material will flow back to the rotary kiln 4 during the rotation of the rotary kiln 4. At this stage, the concave reflow groove 12 contains two kinds of materials. One is the falling material entering the smoke chamber 3, the material is scattered and falls into the concave reflow groove 12, and the other is the material reflowing in the rotary kiln 4; the first corner 7, the second corner 8 and the extension of the drop pipe can reduce the falling material from falling into the concave reflow groove 12, and in this embodiment, because the inner diameter value of the annular guard plate 11 of the reflux kiln mouth is smaller than the inner diameter value of the reflow member 9, the reflux of the material in the rotary kiln 4 can be slowed down.

[0034] As a preferred embodiment, the ring width of the kiln mouth annular guard plate 11 is 400 mm.

[0035] In the above embodiment, the ring width of the kiln mouth annular guard plate 11 is 400 mm, which is 300 mm at present, and can further prevent the backflow of materials without affecting the feeding.

[0036] In summary, the embodiment of the present invention provides a rotary kiln feeding structure, which extends the discharge pipe 2 and extends the discharge port of the discharge pipe 2 to the lower part of the smoke chamber 3 by extending the discharge pipe 2, thereby reducing the dispersion of the material. By changing the angle values ​​of the first corner 7 and the second corner 8 of the discharge pipe 2, the slope of the discharge pipe 2 is actually slowed down, thereby reducing the speed and force of the material out of the discharge pipe 2. From the three perspectives of speed, force and dispersion, the problem of damaged sealing effect of the fish scales at the connection point 5 caused by the discharge problem is fundamentally alleviated, and the high-temperature material coming out of the damaged sealing fish scales 6 is reduced, thereby ensuring personnel safety and atmospheric environment to a certain extent; at the same time, due to the reduction of material retained at the sealing fish scales 6, the phenomenon of material adhesion and accumulation in the concave groove hindering material reflux is alleviated, the number of personnel shutdowns for maintenance is reduced, and the smooth operation of the production system is ensured.

[0037] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotary kiln feeding structure, comprising a cyclone (1), a feeding pipe (2), a smoke chamber (3) and a rotary kiln (4) connected in sequence, wherein the smoke chamber (3) and the rotary kiln (4) are connected to form a joint (5), and the joint (5) is provided with a sealing fish scale (6), characterized in that: The end of the discharge pipe (2) away from the cyclone (1) passes through the side wall of the smoke chamber (3) and extends obliquely along the direction of gravity to be placed inside the smoke chamber (3).

2. A rotary kiln feeding structure according to claim 1, characterized in that: The discharge pipe (2) is bent toward the cyclone (1) at a first set amplitude to form a first corner (7), and is bent toward the smoke chamber (3) at a second set amplitude at a distance to form a second corner (8). Both the first set amplitude and the second set amplitude are used to slow down the flow speed of the material in the discharge pipe (2).

3. A rotary kiln feeding structure according to claim 2, characterized in that: The degree of the first corner (7) is 120 degrees.

4. A rotary kiln feeding structure according to claim 2 or 3, characterized in that: The degree of the second corner (8) is 150 degrees.

5. A rotary kiln feeding structure according to claim 4, characterized in that: The rotary kiln (4) is provided with a reflow piece (9) and a refractory brick layer (10), the reflow piece (9) comprises a plurality of annularly arranged concave reflow grooves (12), a kiln mouth annular guard plate (11) is provided between the reflow piece (9) and the refractory brick layer (10), and the inner diameter of the kiln mouth annular guard plate (11) is smaller than the inner diameter of the reflow piece (9).

6. A rotary kiln feeding structure according to claim 5, characterized in that: The ring width of the kiln mouth annular guard plate (11) is 400 mm.

Images