A rotary kiln for reducing powder loss

Abstract

The present invention discloses a rotary kiln for reducing powder loss, comprising a rotary kiln cylinder and a feeder barrel. An insulation baffle is provided within the rotary kiln cylinder, the insulation baffle being sealed around the rotary kiln cylinder and separating a functional chamber at the front end of the rotary kiln cylinder. A first and a second material shifting plate are fixedly connected to the insulation baffle near the functional chamber. A first and a second material baffle are fixedly connected to the rotary kiln cylinder, and the angles between the first and second material baffles and the first and second material shifting plates are acute. A through hole is provided in the middle of the insulation baffle, and a baffle is fixedly connected to the feeder barrel near the through hole, through which the feeder barrel passes. The rotary kiln cools powder dust discharged with gas to lose its viscosity, and recovers the powder dust and returns it to the heating section for further processing, thereby improving the product recovery rate during the heat treatment process.

Description

Technical Field

[0001] The present invention relates to the field of rotary kilns, in particular to a rotary kiln capable of reducing powder loss. Background Art

[0002] Rotary kilns are widely used for the dynamic drying and calcination of powdered or granular materials and are widely adopted in various fields. However, the relatively simple cylinder structure of traditional rotary kilns is not specifically designed for temperature-sensitive materials with unclear melting and boiling points, or materials with widely varying particle sizes. In particular, in processes involving material coating and modification, the rotary kiln continuously tumbles, lifts, and heats the powder and viscous additives, such as asphalt, to achieve thorough mixing and coating. This process generates powder dust and gas. When the gas is exhausted, the powder dust is also discharged along with the gas. The asphalt additives adhering to the powder dust soften due to heat, making the powder dust sticky and causing problems such as powder loss and sticky clogging. Summary of the Invention

[0003] The purpose of the present invention is to provide a rotary kiln with the function of reducing powder loss. The rotary kiln cools down the powder dust discharged with the gas to lose its viscosity, and recovers the powder dust and returns it to the heating section for further processing, thereby improving the product recovery rate during the heat treatment process.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A rotary kiln for reducing powder loss includes a rotary kiln cylinder and a feeder barrel. The rotary kiln cylinder is characterized in that a thermal insulation partition is provided in the rotary kiln cylinder, the thermal insulation partition is sealed to the rotary kiln cylinder on all sides and separates a functional cavity at the front section of the rotary kiln cylinder, the thermal insulation partition is fixedly connected to a first and a second material shifting plate on a side close to the functional cavity, the rotary kiln cylinder is fixedly connected to a first and a second material baffle plate, the first and second material baffle plates are respectively connected to the first and second material shifting plates at acute angles, a through hole is provided in the middle of the thermal insulation partition, the feeder barrel is fixedly connected to a baffle near the through hole, and the feeder barrel passes through the through hole.

[0006] Preferably, the distance between the baffle and the thermal insulation partition is 1.5-2 times the diameter of the through hole.

[0007] Preferably, the first material diverting plate and the second material diverting plate are L-shaped as a whole, and consist of an arc-shaped material diverting bottom plate and a side plate connected to the upper side.

[0008] Preferably, one end of the material-dividing bottom plate is a material receiving port, and the other end is a material discharging port; one side of the material-dividing bottom plate is connected to the thermal insulation partition; the side of the material-dividing bottom plate close to the thermal insulation partition includes an inner long side and an inner short side, and the inner long side and the inner short side are perpendicular to each other; the side of the material-dividing bottom plate away from the thermal insulation partition includes an outer long side and an outer short side, and there is an obtuse angle between the outer long side and the outer short side.

[0009] Preferably, the side plates are fixedly connected to the outer long sides and outer short sides of the material-diverting bottom plate.

[0010] Preferably, the first and second material stripping plates are fixed on the thermal insulation partition in a spiral symmetrical manner, and the direction from the receiving port to the discharging port is consistent with the rotation direction of the rotary kiln; after the discharging port passes through the through hole, it is fixedly connected to the through hole wall.

[0011] Preferably, the first material baffle plate and the second material baffle plate are respectively close to the material receiving openings of the first material diverter plate and the second material diverter plate and are spirally symmetrically distributed along the rotation direction of the rotary kiln cylinder.

[0012] In the above technical solution, a functional chamber is separated from the front section of the rotary kiln cylinder by a thermal insulation partition that is sealed around the cylinder. The thermal insulation partition blocks the high temperature at the rear, ensuring that the temperature of the functional chamber does not become too high, preventing powder dust from sticking due to the high temperature, while also maintaining the temperature of the powder in the feeder barrel. A through hole is provided at the center of the thermal insulation partition, and the feeder barrel passes through the functional chamber and the through hole to reach the rear of the thermal insulation partition, ensuring smooth powder transportation. The baffle is welded to the feeder barrel near the through hole. In this way, the protective atmosphere or generated gas in the rotary kiln cylinder passes through the through hole and encounters the baffle to generate vortexes. Large particles of powder dust are separated from the airflow and settled due to inertia. After the gas enters the functional chamber, the powder dust in the airflow is further reduced and continues to settle. The first baffle plate is fixedly connected to the rotary kiln cylinder, and the first material removal plate is fixedly connected to the thermal insulation partition and passes through the through hole. The settled powder material rotates with the rotary kiln cylinder and is intercepted by the first baffle plate. The first baffle plate forms an acute angle with the first diverter plate. As the rotary kiln cylinder rotates, the intercepted powder material is pushed into the first diverter plate's receiving port. Due to the special structure of the first diverter plate, the powder material continues to rotate with the cylinder and is returned to the heating section behind the insulation partition via the first diverter plate, achieving cooling and recovery of the lost powder material.

[0013] The second material baffle plate, the second material diverter plate and the first material baffle plate, the first material diverter plate are distributed in a spiral symmetrical manner in the functional cavity, and the effect and working principle are the same. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A partial cross-sectional view of a rotary kiln designed to reduce powder loss;

[0015] Figure 2Left side cross-sectional view of a rotary kiln designed to reduce powder loss (without baffle structure);

[0016] Figure 3 Left side cross-sectional view of a rotary kiln (with baffle structure) designed to reduce powder loss;

[0017] Figure 4 It is a structural schematic diagram of the first material stripping plate and the second material stripping plate.

[0018] In the figure: 1 rotary kiln cylinder; 2 insulation partition; 3 baffle; 4 first material shifting plate; 5 second material shifting plate; 6 first material baffle; 7 second material baffle; 8 feeder barrel; 9 functional cavity; 10 smoke exhaust port; 21 through hole; 211 through hole wall; 41 material shifting bottom plate; 42 side plate; 43 inner long side; 44 inner short side; 45 outer long side, 46 outer short side; 47 material receiving port; 48 material discharging port. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings:

[0020] like Figure 1 As shown, an embodiment of the present invention provides a rotary kiln with the function of reducing powder loss, comprising a rotary kiln cylinder 1, an insulation partition 2, a baffle 3, a first material shifting plate 4, a second material shifting plate 5, a first material baffle 6, a second material baffle 7, a feeder barrel 8; a functional chamber 9; and a smoke exhaust port 10.

[0021] The insulation partition 2 is sealed around the front section of the rotary kiln cylinder 1, separating the functional chamber 9 at the front section of the rotary kiln. Under the action of the insulation partition 2, the temperature of the functional chamber 9 is lower than that behind the insulation partition 2, so that the settled powder and the powder in the feeder barrel will not soften and stick due to heat, causing blockage. A through hole 21 is opened in the middle of the insulation partition 2. The feeder barrel 8 passes through the smoke exhaust port 10, the functional chamber 9, and the through hole 21 to reach the rear of the insulation partition 2, ensuring smooth material transportation. The through hole 21 also serves as a channel for gas to move toward the smoke exhaust port 10. The baffle 3 is fixedly connected to the feeder barrel 8 at a distance of 1.5-2 times the diameter of the through hole 21. The baffle 3 is used to change the flow direction and speed of the exhaust gas, so that the dust carried by the gas will settle due to inertia. The first material plate 4 is L-shaped as a whole and is fixedly connected to the insulation partition 2. The first material diverter plate 4 is composed of an arc-shaped material diverter base plate 41 and a side plate 42. The large opening end of the material diverter base plate 41 is a material receiving port 47 and the small opening end is a material discharging port 48. One side of the material diverter base plate 41 is connected to the thermal insulation partition 2, and the material discharging port 48 passes through the through hole 21 and is connected to the through hole wall 211. The side of the material diverter base plate 41 close to the thermal insulation partition 2 includes an inner long side 43 and an inner short side 44, and the inner long side 43 and the inner short side 44 are perpendicular to each other. The side of the material diverter base plate 41 away from the thermal insulation partition 2 includes an outer long side 45 and an outer short side 46, and the outer long side 45 and the outer short side 46 form an obtuse angle. The side plate 42 is fixedly connected to the outer long side 45 and the outer short side 46 of the material diverter base plate 41. The direction from the material receiving port 47 to the material discharging port 48 is consistent with the rotation direction of the rotary kiln shell 1. The second baffle plate 5 has the same structure as the first baffle plate 4 and is arranged helically symmetrically with the first baffle plate 4 on the insulation partition 2. The first baffle plate 6 is fixedly connected to the rotary kiln shell 1 and tilted toward the material receiving port 47 at an acute angle. During the rotation of the rotary kiln shell, the first baffle plate 6 is used to intercept and collect settled powder. The first baffle plate 6 then enters the material receiving port 47 due to the tilt of the first baffle plate 6, achieving powder recovery. The second baffle plate 7 has the same structure as the first baffle plate 6 and is arranged helically symmetrically with the first baffle plate 6 within the functional chamber 9.

[0022] During operation, powders and viscous additives such as asphalt enter the heating section of the rotary kiln through the feeder's barrel. These materials are continuously tumbled, lifted, and heated, generating gas that entrains the powder and dust. As this dust-entrained gas moves from the heating section toward the exhaust port, it passes through the through-holes. Due to the reduced diameter, the gas velocity increases, adding kinetic energy to the entrained powder and dust. The gas then encounters a baffle, forcing it to change direction. Large particles of powder and dust are then blocked and settled due to inertia. After passing through the through-holes and entering the functional chamber, the increased space and lowered temperature slow the gas flow further, allowing the powder and dust to continue settling due to gravity. The settled powder is then intercepted and collected by the baffle plate as the rotary kiln rotates. The collected powder, driven by the kiln's rotation and the baffle plate's tilt, is then pushed toward the feed inlet of the feed plate. As the rotary kiln continues to rotate, the settled dust flows along the shifting plate back to the heating section behind the insulation partition, recovering lost powder and dust and improving product recovery during the heat treatment process. Because the insulation partition blocks the high temperature from the heating section from entering the functional chamber, the powder dust and the powder in the feeder barrel are prevented from softening due to the high temperature, which could cause sticking and clogging.

[0023] This embodiment is only an illustration of the concept and implementation of the present invention and does not limit it. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A rotary kiln for reducing powder loss, comprising a rotary kiln cylinder and a feeder barrel, characterized in that: An insulation partition is provided in the rotary kiln cylinder, which is sealed and connected to the rotary kiln cylinder on all sides and separates a functional cavity at the front section of the rotary kiln cylinder. The insulation partition is fixedly connected to the first and second diverter plates near the side of the functional cavity. The first and second diverter plates are spirally symmetrically fixed on the insulation partition. The first and second baffle plates are fixedly connected to the rotary kiln cylinder. The angles between the first and second baffle plates and the first and second diverter plates are acute angles. A through hole is provided in the middle of the insulation partition. The feeder barrel is fixedly connected to a baffle near the through hole, and the feeder barrel passes through the through hole. The first and second diverter plates are integrally connected. It is L-shaped and consists of an arc-shaped material-diverting base plate and a side plate connected to the upper side; one side of the material-diverting base plate is connected to the thermal insulation partition; and the side of the material-diverting base plate close to the thermal insulation partition includes an inner long side and an inner short side, and the inner long side and the inner short side are perpendicular to each other; the side of the material-diverting base plate away from the thermal insulation partition includes an outer long side and an outer short side, and the outer long side and the outer short side form an obtuse angle, and the side plate is fixedly connected to the outer long side and the outer short side of the material-diverting base plate; one end of the material-diverting base plate is a material receiving port, and the other end is a material discharging port, and the direction from the material receiving port to the material discharging port is consistent with the rotation direction of the rotary kiln, and the material discharging port is fixedly connected to the through hole wall after passing through the through hole.

2. The rotary kiln for reducing powder loss according to claim 1, wherein: The distance between the baffle and the heat-insulating partition is 1.5-2 times the diameter of the through hole.

3. The rotary kiln for reducing powder loss according to claim 1, characterized in that: The first material baffle plate and the second material baffle plate are respectively close to the material receiving openings of the first material diverter plate and the second material diverter plate and are spirally symmetrically distributed along the rotation direction of the rotary kiln cylinder.

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