A dynamic material lifting device for a cement kiln and a cement kiln adopting the device

Abstract

The present invention provides a dynamic material lifting device for a cement kiln and a cement kiln adopting the device, which relates to the field of cement kiln equipment, and solves the problems of relatively low heat exchange efficiency and relatively high incidence of "short circuit" existing in the prior art. The dynamic material lifting device comprises a material lifting box with an inner hole and a material lifting impeller drivingly connected to a driving device. The material lifting impeller is arranged inside the material lifting box and below the feed inlet and downstream of the receiving platform. The material lifting impeller comprises a hub having a rotating shaft and blades arranged on the surface of the hub. The rotating shaft is horizontally arranged and movably installed in the material lifting box, and the driving device is used for driving the material lifting impeller to rotate. The side part of the material lifting box of the cement kiln is hermetically connected to the pipe wall of the outlet air duct of the cyclone. The feed pipe is hermetically connected to the feed inlet of the material lifting box. The present invention improves the dispersion of materials and the mixing effect with high-temperature gas through the material lifting device, improves the heat exchange efficiency of the cement kiln system, improves the energy utilization efficiency in the cement production process, and reduces the occurrence of "short circuit".

Description

Technical Field

[0001] The present invention relates to the field of cement kiln equipment. Specifically, it is a dynamic material lifting device for a cement kiln and a cement kiln using this device. Background Art

[0002] In the currently most common new dry-process precalcining cement kilns in the world, a material preheating and decomposition system composed of multiple cyclones and a decomposition furnace is widely used for rapid preheating and decomposition of low-temperature materials. The flow direction of the materials is: low-temperature material feeding point - primary cyclone - secondary cyclone - tertiary cyclone - quaternary cyclone - decomposition furnace - quinary cyclone - rotary kiln. The flow direction of the high-temperature gas is: rotary kiln + tertiary air duct - decomposition furnace - quinary cyclone - quaternary cyclone - tertiary cyclone - secondary cyclone - primary cyclone - discharging from the preheater system.

[0003] For the current material spreading devices used in the preheater and decomposition furnace of the new dry-process precalcining cement kiln, the low-temperature materials flow rapidly obliquely downward along the feeding pipe under the action of gravity, impact the receiving platform at the bottom of the material spreading device, and splash towards the high-temperature air duct after being impacted. After falling into the high-temperature air duct, they meet the rapidly rising high-temperature gas in the duct. The materials are lifted by the rapidly rising high-temperature gas and change their movement direction to move in the same direction as the high-temperature gas flow. During this process, the materials will gradually mix with the high-temperature gas and come into contact with each other, realizing the process of transferring the heat carried by the high-temperature gas to the low-temperature materials, achieving the purpose of preheating the materials and simultaneously reducing the gas temperature. Let the materials fall and splash and disperse naturally after impacting the receiving platform. The control ability of the material flow is poor, and the heat exchange efficiency of the system is low. Because the stocky materials rush downward rapidly and with great force under the action of gravity, it is very difficult to suspend all the materials by the high-temperature gas, and sometimes even the situation where the materials cannot be suspended and directly collapse occurs, that is, the so-called material "short circuit", and the entire cement kiln system cannot operate normally. Summary of the Invention

[0004] The purpose of the present invention is to design a dynamic material lifting device for a cement kiln and a cement kiln using this device, to improve the material dispersion and the mixing effect with high-temperature gas by adopting a self-powered material lifting device, thereby improving the heat exchange efficiency of the cement kiln system, improving the energy utilization efficiency in the cement production process, achieving the purpose of energy conservation, and reducing the occurrence of "short circuit".

[0005] The present invention is achieved by the following technical solutions:

[0006] The present invention provides a dynamic material lifting device for a cement kiln, including a material lifting box, a material lifting impeller, and a driving device;

[0007] The inner side of the lifting box has a cavity, the upper part of the lifting box has a feeding port connected to the cavity, the side of the lifting box has a discharge port connected to the cavity, and the lifting box has a receiving platform;

[0008] The lifting impeller is arranged inside the lifting box and below the feed port and downstream of the receiving platform, and is used to receive the material after colliding with the receiving platform; the lifting impeller comprises a hub with a rotating shaft and blades arranged on the surface of the hub, and the rotating shaft is arranged horizontally and movably mounted on the lifting box;

[0009] The driving device is transmission-connected to the rotating shaft to drive the lifting impeller to rotate.

[0010] When the above-mentioned structure is adopted, the existing material spreading box structure is utilized, and a material lifting impeller connected to the driving device is added inside the material spreading box, and the driving device can drive the material lifting impeller to rotate around the horizontally arranged rotating shaft. The material falling into the material spreading box from the feed port runs at high speed toward the material lifting impeller at the downstream after hitting the receiving platform, and then the material can have a violent secondary collision with the rotating material lifting impeller, further crushing the agglomerated material, achieving full dispersion of the material, and making the material more fully mixed with the high-temperature hot air flow, thereby improving the heat exchange efficiency of the cement kiln system and the energy utilization efficiency of the cement production process. At the same time, the material is intercepted by the blades and moves along the rotation direction, and then thrown out in the radial direction away from the axis of the material lifting impeller under the action of centrifugal force, so that the material can be sprinkled into the outlet duct of the cyclone along an oblique upward parabolic trajectory, and meet the high-speed upward hot air flow in the outlet duct of the cyclone, and finally fully mixed with the hot air flow in the duct and carried away, and enter the next process. By changing the movement trajectory of the material flowing into the lifting impeller for the second time, the material is thrown into the high-temperature airflow at an upward angle, so that the material has a movement speed in the same direction as the rising airflow, making it easier for the material to be carried away by the high-temperature gas, reducing the occurrence of material "short circuit".

[0011] In order to further better realize the present invention, the following setting structure is particularly adopted: the lifting impeller is arranged obliquely below the receiving platform.

[0012] When the above-mentioned setting structure is adopted, when the lifting impeller is arranged obliquely below the receiving platform of the lifting box, its setting position can make the blades on the hub surface just receive the materials rushing down at high speed along the lifting impeller.

[0013] In order to better realize the present invention, the following configuration is particularly adopted: the hub is sequentially provided with a plurality of blades arranged at equal angles along its circumference.

[0014] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the blades extend linearly along the radial direction of the material-lifting impeller in its height direction, or the blades bend and extend backward in the rotational direction of the material-lifting impeller in its height direction.

[0015] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the blades are involute-shaped blades.

[0016] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the receiving platform is an inclined panel with the downstream end lower than the upstream end.

[0017] When the above setting structure is adopted, the receiving platform is inclined, which can make the material rush more smoothly and violently towards the material-lifting impeller located downstream under the action of gravity and inertia after hitting the receiving platform, obtaining a better impact dispersion effect.

[0018] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the inclination angle between the receiving platform and the horizontal plane is 10 - 15°.

[0019] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the height of the blades gradually decreases from the middle of the material-lifting impeller towards both ends along the axial direction of the material-lifting impeller.

[0020] When the above setting structure is adopted, the material-lifting impeller as a whole has a drum-shaped structure that is thin at both ends and thick in the middle, which can make the distribution range of the material after being scattered larger, be able to better cover the circular cross-section of the rising hot air flow, realize the full contact and mixing of the material and the hot air flow, improve the heat exchange between the material and the air flow, and improve the heat exchange efficiency of the cement kiln preheater and decomposition furnace system.

[0021] The present invention also provides a cement kiln, including a feed pipe, a cyclone outlet air duct, and the above-mentioned power material-lifting device. The side part of the material-lifting box is hermetically connected to the pipe wall of the cyclone outlet air duct, the discharge port is internally communicated with the cyclone outlet air duct, and the feed pipe is hermetically connected to the feed port of the material-lifting box.

[0022] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the rotational direction of the material-lifting impeller is from bottom to top on the side close to the receiving platform, and from top to bottom on the side far from the receiving platform.

[0023] Furthermore, to better implement the present invention, the following setting structures are particularly adopted: the center line of the rotating shaft is tangent to the cross-sectional circle of the cyclone outlet air duct.

[0024] When the above-mentioned setting structure is adopted, the material-lifting impeller is half inserted into the outlet air duct of the cyclone, which can reduce the ventilation area at this part of the original outlet air duct of the cyclone, thereby increasing the air velocity at this part to enhance the material-carrying capacity of the upward hot air flow. At the same time, when the material-lifting impeller is half inserted into the outlet air duct of the cyclone, the overall volume of the power material-lifting device can also be reduced, facilitating the connection with the feed pipe of the existing cement kiln system.

[0025] The present invention has the following advantages and beneficial effects:

[0026] In the present invention, by using the existing material-spreading box structure and adding a material-lifting impeller internally connected to the driving device in a transmission manner, the driving device can drive the material-lifting impeller to rotate around a horizontally arranged rotating shaft. The material falling from the feed inlet into the material-lifting box runs at a high speed towards the downstream material-lifting impeller after hitting the receiving platform. Subsequently, the material can have a violent secondary collision with the rotating material-lifting impeller, further smashing the agglomerated material, achieving full dispersion of the material, enabling the material to be more fully mixed with the high-temperature hot air flow, thereby improving the heat exchange efficiency of the cement kiln system and the energy utilization efficiency in the cement production process. At the same time, the material is intercepted by the blades and moves along the spiral direction together and is then ejected radially away from the axis under the action of centrifugal force. Therefore, the material can be scattered into the outlet air duct of the cyclone along an upward parabolic trajectory, meet the hot air flow moving upward at a high speed in the outlet air duct of the cyclone, and finally be fully mixed with the air flow in the air duct and carried away to enter the next process. By changing the movement trajectory of the material flowing onto the material-lifting impeller twice and scattering the material into the high-temperature gas flow at an upward angle, the material has a movement speed in the same direction as the upward air flow, making it easier for the material to be carried away by the high-temperature gas and reducing the occurrence of the situation of material "short circuit". BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0028] Figure 1 is a half-sectional schematic view of the power material-lifting device;

[0029] Figure 2 is a schematic structural view of the material-lifting impeller;

[0030] Figure 3 is a schematic structural view of the part of the cement kiln adopting the power material-lifting device;

[0031] Figure 4 is a schematic process flow diagram of the part of the power material-lifting device;

[0032] The markings in the figure are:

[0033] 1. Material lifting box; 11. Material inlet; 12. Material outlet; 13. Receiving platform;

[0034] 2. Lifting impeller; 21. Hub; 22. Blades; 23. Rotating shaft;

[0035] 3. Driving device; 31. Motor; 32. Transmission system bracket; 33. Coupling;

[0036] 4. Bearing seat

[0037] 5. Feed pipe;

[0038] 6. Cyclone outlet air duct. DETAILED DESCRIPTION

[0039] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] A power material lifting device for cement kiln, which improves the dispersion of materials and the mixing effect with high-temperature gas by using a self-powered material lifting device, thereby improving the heat exchange efficiency of the cement kiln system, improving the energy utilization efficiency of the cement production process, achieving the purpose of energy saving, and reducing the occurrence of "short circuit", such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it is particularly configured as follows:

[0042] The utility model comprises a material raising box 1, a material raising impeller 2 and a driving device 3.

[0043] Basically, the shell of the lifting box 1 is a hollow polyhedron with a cavity inside. A circular feed port 11 is separately provided on the inclined portion of the upper part of the lifting box 1. The feed port 11 is connected to the cavity inside the lifting box 1 and is used to connect to the feed pipe 5 to receive materials. The side of the lifting box 1 is not closed by a plate and is formed with a discharge port 12 connected to the cavity. The profile of the discharge port 12 matches the cyclone outlet air duct 6 to be connected. There is a receiving platform 13 in the lifting box 1, and the receiving platform 13 is located below the discharge port 12.

[0044] The lifting impeller 2 is used to receive the material after colliding with the receiving platform 13. The lifting impeller 2 is arranged in the inner cavity of the lifting box 1, and is located as a whole below the feed port 11 and downstream of the receiving platform 13. The lifting impeller 2 includes a hub 21, blades 22 and a rotating shaft 23. The rotating shaft 23 is coaxially arranged with the hub 21, the hub 21 is sleeved on the rotating shaft 23, and the blades 22 are fixedly arranged on the surface of the hub 21. The rotating shaft 23 is arranged horizontally, and the two ends of the rotating shaft 23 pass through the steel plates on both sides of the lifting box 1 to the outside of the lifting box 1. A labyrinth sealing device is installed where the rotating shaft 23 passes through the shell of the lifting box 1 to prevent air leakage and material leakage from there. The two protruding end sleeves of the rotating shaft 23 are each equipped with a bearing, and a bearing seat 4 is fixed by bolts on the transmission system bracket 32 ​​of the driving device 3 and the outer wall of the shell of the lifting box 1, and the bearings at both ends of the rotating shaft 23 are installed in the corresponding bearing seat 4. The rotating shaft 23 can rotate around the axis of the rotating shaft 23 together with the hub 21 and the blades 22 .

[0045] The driving device 3 includes a transmission system bracket 32 ​​welded and fixedly mounted on the outer wall of the lifting box 1, a motor 31 mounted on the transmission system bracket 32, and a pair of couplings 33. The motor 31 is a variable frequency high-speed motor. The rotating shaft 23 is driven on one side, and its length ends at the bearing at the end of the rotating shaft 23 without the driving device 3. An end cover is provided on the side of the bearing seat 4 away from the lifting box 1 to ensure the sealing of the bearing seat 4. At the end of the rotating shaft 23 with the driving device 3, the rotating shaft 23 passes through the bearing and half of the coupling 33 is installed. Half of the coupling 33 is installed on the main shaft of the motor 31, so that the motor 31 and the lifting impeller 2 are connected in transmission to drive the lifting impeller 2 to rotate.

[0046] Specifically, the blades 22 have a plurality of blades, for example, twelve blades, which are arranged at equal angles in sequence around the circumference of the hub 21 and are radially distributed. The blades 22 may be straight blades extending in a radial straight line along the height direction of the lifting impeller 2, or may be curved blades extending in a curved direction toward the rear of the rotation direction of the lifting impeller 2 in the height direction. The curved blades are preferably involute blades. The specific blade form is determined as needed in actual applications.

[0047] As a preferred arrangement scheme of the receiving platform 13 in this embodiment, the receiving platform 13 is an inclined panel with a downstream end lower than an upstream end, and the inclination angle between the receiving platform 13 and the horizontal plane is 10-15°. The receiving platform 13 is arranged inclined, so that the material from the cyclone outlet air duct 6 can hit the receiving platform 13 and rush more smoothly and violently from the higher upstream to the lower downstream impeller 2 under the action of gravity and inertia, thereby obtaining a better impact dispersion effect.

[0048] The above structural scheme utilizes the existing material spreading box structure, and adds a material lifting impeller 2 which is transmission-connected with the driving device 3 inside the material spreading box, and the driving device 3 can drive the material lifting impeller 2 to rotate around the horizontally arranged rotating shaft 23. The material falling into the material lifting box 1 from the feed port 11 hits the receiving platform 13 and then runs at high speed to the material lifting impeller 2 at the downstream, and then the material can have a violent secondary collision with the rotating material lifting impeller 2, further crushing the agglomerated material, achieving full dispersion of the material, and making the material more fully mixed with the high-temperature hot air flow, thereby improving the heat exchange efficiency of the cement kiln system and the energy utilization efficiency of the cement production process. At the same time, the material is intercepted by the blades 22 and moves along the rotation direction, and then under the action of centrifugal force, it is ejected in the radial direction away from the axis of the material lifting impeller 2, so that the material can be sprinkled into the cyclone outlet air duct 6 along an oblique upward parabolic trajectory, and meet the high-speed upward hot air flow in the cyclone outlet air duct 6, and finally fully mixed with the hot air flow in the air duct and taken away, and enter the next process. By changing the movement trajectory of the material flowing into the lifting impeller 2 for the second time, the material is thrown into the high-temperature airflow at an oblique upward angle, so that the material has a movement speed in the same direction as the rising airflow, making it easier for the material to be carried away by the high-temperature gas, reducing the occurrence of material "short circuit".

[0049] Embodiment 2:

[0050] This embodiment is further optimized on the basis of the above embodiment, and further adopts the following configuration structure in order to better realize the present invention:

[0051] The lifting impeller 2 is disposed as a whole at an angle below the receiving platform 13. Specifically, the axis of the rotating shaft 23 is located at an angle below the receiving platform 13, and the cross-sectional circle of the lifting impeller 2 can be tangent to or intersect with the extension line of the receiving platform 13. When the lifting impeller 2 is disposed at an angle below the receiving platform 13 of the lifting box 1, the blades 22 on the surface of the hub 21 can just receive the material rushing down at high speed along the lifting impeller 2.

[0052] Embodiment 3:

[0053] This embodiment is further optimized on the basis of the above embodiment, and further adopts the following configuration structure in order to better realize the present invention:

[0054] The hub 21 in the material-lifting impeller 2 is a hub with an equal diameter. The height of the blade 22 gradually decreases from the middle of the material-lifting impeller 2 along the axial direction of the material-lifting impeller 2 towards both ends, making the overall shape of the material-lifting impeller 2 a drum-shaped structure that is thinner at both ends and thicker in the middle. The purpose of this is to make the distribution shape of the material after being scattered better match the circular cross-section of the outlet air duct 6 of the cyclone, so that the distribution range of the material is larger, and it can better cover the circular cross-section of the rising hot air flow, realizing the full contact and mixing of the material and the hot air flow, improving the heat exchange between the material and the air flow, and enhancing the heat exchange efficiency of the cement kiln preheater and decomposition furnace system.

[0055] Example 4:

[0056] On the basis of the above embodiments, this embodiment further provides a cement kiln, especially adopting the following setting structure:

[0057] This type of cement kiln adopts the power-driven material-lifting device in Embodiment 3 and installs the power-driven material-lifting device at the required place for use. The structure of the part where the power-driven material-lifting device is installed includes a feed pipe 5, an outlet air duct 6 of the cyclone, and the power-driven material-lifting device. An opening is provided on the pipe wall of the outlet air duct 6 of the cyclone. The side discharge port 12 of the material-lifting box 1 is aligned with the opening and is hermetically connected to the periphery of the opening. The discharge port 12 communicates with the inside of the outlet air duct 6 of the cyclone. The feed pipe 5 is obliquely arranged, and the bottom end of the feed pipe 5 is aligned with and hermetically connected to the feed port 11 on the upper part of the material-lifting box 1.

[0058] As a preferred setting scheme of the material-lifting impeller 2 in this embodiment, the center line of the rotating shaft 23 of the material-lifting impeller 2 is tangent to the cross-sectional circle of the outlet air duct 6 of the cyclone, so that half of the material-lifting impeller 2 enters the outlet air duct 6 of the cyclone. This can reduce the ventilation area at this part of the original outlet air duct of the cyclone, thereby increasing the wind speed at this part to enhance the material-carrying capacity of the rising hot air flow. At the same time, when half of the material-lifting impeller 2 enters the outlet air duct 6 of the cyclone, it can also reduce the overall volume of the power-driven material-lifting device, facilitating the connection with the feed pipe of the existing cement kiln system.

[0059] Among them, the rotating direction of the material-lifting impeller 2 is from bottom to top on the side close to the receiving platform 13, and from top to bottom on the side far from the receiving platform 13.

[0060] The above structural scheme improves the material dispersion and the mixing effect with high-temperature gas by adopting a self-powered material-lifting device, thereby enhancing the heat exchange efficiency of the cement kiln system, improving the energy utilization efficiency in the cement production process, and achieving the purpose of energy conservation. This power-driven material-lifting device replaces the traditional static material spreading used on the cyclone of the cement kiln. Therefore, its installation position is at the position of the original static material-spreading box of each cyclone of the cement kiln. During production, such as Figure 4As shown, the hollow arrow represents the rising hot air current, and the black dot represents the material. The material in the cement kiln system flows into the material lifting box 1 of the dynamic material lifting device along the feed pipe 5 of the cyclone. Under the action of gravity and inertia, the material falls onto the higher end of the inclined receiving platform 13, and after impact, it flows along the receiving platform 13 towards the lower downstream direction to the material lifting impeller 2, where it is impacted and dispersed by the high-speed rotating blades 22 and thrown obliquely upwards into the outlet air duct 6 of the cyclone. It meets the high-speed upward hot air current in the air duct, and finally is fully mixed with the air in the air duct and carried away to enter the next process.

[0061] This dynamic material lifting device is equipped with a material lifting impeller 2 that can rotate at high speed. The blades 22 carried by the material lifting impeller 2 can break up the agglomerated material when contacting the material, making the dispersion effect of the material better than that of the traditional material spreading device. The rotary motion of the material lifting impeller 2 can change the movement trajectory of the material flowing onto the blades 22, and sprinkle the material into the high-temperature gas stream at an oblique upward angle, so that the material has a movement speed in the same direction as the rising air current. In the traditional material spreading device, the material rushes downward into the rising air current under the action of gravity. Therefore, in comparison, the dynamic material lifting device in this embodiment can make the material more easily carried away by the high-temperature gas, reducing the problem of "short circuit" of the material existing in the use of the traditional material spreading device. The axial outer edge shape of the blades 22 of this dynamic material lifting device is drum-shaped, which enables the distribution range of the material after being sprinkled to better cover the circular cross-section of the rising hot air current, realizing full contact and mixing contact between the material and the air current, improving the heat exchange between the material and the air current, and enhancing the heat exchange efficiency of the cement kiln preheater and decomposition furnace system.

[0062] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A power material lifting device for a cement kiln, characterized in that: It comprises a lifting box (1), a lifting impeller (2) and a driving device (3); The inner side of the lifting box (1) has a cavity, the upper part of the lifting box (1) has a feeding port (11) connected to the cavity, the side of the lifting box (1) has a discharge port (12) connected to the cavity, and the lifting box (1) has a receiving platform (13); the receiving platform (13) is an inclined panel with a downstream end lower than an upstream end; the inclination angle between the receiving platform (13) and the horizontal plane is 10-15° The lifting impeller (2) is arranged inside the lifting box (1) and below the feed inlet (11) and downstream of the receiving platform (13), and is used to receive the material after colliding with the receiving platform (13); the lifting impeller (2) comprises a hub (21) having a rotating shaft (23) and blades (22) arranged on the surface of the hub (21), and the rotating shaft (23) is arranged horizontally and movably mounted on the lifting box (1); the height of the blades (22) gradually decreases from the middle of the lifting impeller (2) along the axial direction of the lifting impeller (2) toward both ends; the lifting impeller (2) is arranged obliquely below the receiving platform (13); the hub (21) is provided with a plurality of blades (22) arranged at equal angles in sequence along its circumference; The driving device (3) is drivingly connected to the rotating shaft (23) to drive the lifting impeller (2) to rotate.

2. The power material lifting device for a cement kiln according to claim 1, characterized in that: The blades (22) extend in a straight line along the radial direction of the lifting impeller (2) in the height direction thereof, or the blades (22) extend in a curved manner in the height direction thereof toward the rear in the rotation direction of the lifting impeller (2).

3. The power material lifting device for a cement kiln according to claim 2, characterized in that: The blade (22) is an involute blade.

4. A cement kiln, characterized in that: It comprises a feed pipe (5), a cyclone outlet air duct (6) and the powered material lifting device according to any one of claims 1 to 3, wherein the side of the material lifting box (1) is sealedly connected to the pipe wall of the cyclone outlet air duct (6), the discharge port (12) is communicated with the interior of the cyclone outlet air duct (6), and the feed pipe (5) is sealedly connected to the feed port (11) of the material lifting box (1).

5. The cement kiln according to claim 4, characterized in that: The center line of the rotating shaft (23) is tangent to the cross-sectional circle of the cyclone outlet air duct (6).

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