A gas suspension calciner feeding device and calciner

Abstract

The utility model discloses a kind of gas suspension roasting furnace feeding device and roasting furnace, including feeding screw mechanism, the output end of feeding screw mechanism extends to flue, so that material is fed to flue center high-speed airflow area.The utility model extends to flue by the output end of feeding screw mechanism, material is accurately fed to flue center high-speed airflow area, material can be carried away by high-speed flowing flue gas, avoid the accumulation of material due to near-wall effect, reduce the jam situation in flue, center feeding improves the heating uniformity of material, improves the utilization of flue gas, can handle higher moisture content material, improve efficiency.

Description

Technical Field

[0001] This utility model relates to the field of roasting furnace technology, specifically to a gas suspension roasting furnace feeding device and a roasting furnace. Background Technology

[0002] When the feeding system of the gas suspension roasting furnace is working, aluminum hydroxide first enters the buffer hopper, is weighed by the metering belt scale, and then enters the feeding screw, which then sends it to the Venturi dryer. In the Venturi dryer, the material with attached moisture is dried by the high-temperature flue gas from the roasting furnace and then lifted to the preheating cyclone separator by the flue gas.

[0003] Due to the viscosity of fluids, resistance is high and flow velocity is low near the pipe wall, while resistance is low and flow velocity is high at the center of the pipe. In the prior art, the inlet end of the feeding screw is close to the inner wall of the flue, causing aluminum hydroxide to fall along the inner wall at a low speed and not be fully lifted. Some material falls into the U-bend and causes blockage. To reduce blockage, the wind speed and fan speed need to be increased, which increases energy consumption. This utility model proposes a new solution to the above problems. Utility Model Content

[0004] To overcome at least one of the aforementioned drawbacks, this utility model provides a gas suspension roasting furnace feeding device and a roasting furnace. The objective of this utility model can be achieved by adopting the following technical solution:

[0005] A first aspect of this application provides a feeding device for a gas suspension roasting furnace, including a feeding screw mechanism, the output end of which extends into the flue to feed material into the high-speed airflow zone at the center of the flue.

[0006] In one possible implementation, the flue is U-shaped and includes a gas feed section, a bend section, and a feeding section connected in sequence, with the bend section located at the bottom bend of the U-shaped structure.

[0007] In one possible implementation, the radius of the axial middle region of the feeding section is greater than the radius of the end of the feeding section, and the output end of the feeding screw mechanism extends to near the axis of the feeding section.

[0008] In one possible implementation, the distance between the output end of the feeding screw mechanism and the axis of the flue is H, and the radius of the cross-section of the flue where the output end of the feeding screw mechanism is located is R, where 0≤H≤0.5R.

[0009] In one possible implementation, the cross-sectional radius of the flue where the output end of the feeding screw mechanism is located is R, at least two feeding screw mechanisms are symmetrically arranged relative to the flue axis, and the distance between the output ends of the two feeding screw mechanisms is 2H, where 0.2R≤2H≤0.5R.

[0010] In one possible implementation, a crushing mechanism is provided inside the bend, which is rotatable to crush the material falling into the bend.

[0011] In one possible implementation, the crushing mechanism includes:

[0012] Drive motor;

[0013] The turntable body is connected to the output end of the drive motor, which is used to drive the turntable body to rotate.

[0014] A plurality of crushing rollers are disposed on the material-facing surface of the turntable body, and the crushing rollers move with the turntable body to interfere with the material.

[0015] In one possible implementation, the turntable body is a conical structure, with the conical surface of the turntable body facing upwards, and a plurality of the crushing rollers are arranged at intervals along the circumference on the conical surface.

[0016] In one possible implementation, the turntable body is a frustum structure, with the upper end face and the frustum face of the turntable body facing upwards, and a plurality of the crushing rollers are arranged circumferentially at intervals on the frustum face and / or the upper end face.

[0017] A second aspect of this application provides a roasting furnace, including the gas suspension roasting furnace feeding device described in any one of the second aspects.

[0018] The beneficial technical effects of this utility model are as follows: According to the present disclosure, the gas suspension roasting furnace feeding device and roasting furnace include a feeding screw mechanism. The output end of the feeding screw mechanism extends into the flue, accurately feeding the material into the high-speed airflow zone in the center of the flue. The material can be carried away by the high-speed flue gas, avoiding the accumulation of material due to the near-wall effect, reducing the blockage in the flue. The central feeding improves the uniformity of material heating, increases the utilization rate of flue gas, and can process materials with higher moisture content, thus improving efficiency. Attached Figure Description

[0019] The following are given by way of example and without limitation in the accompanying drawings:

[0020] Figure 1 This diagram shows the overall structure of a gas suspension roasting furnace feeding device according to an embodiment of the present invention.

[0021] Figure 2 A schematic diagram of the overall structure of the gas suspension roasting furnace feeding device according to another embodiment of the present invention is shown;

[0022] Figure 3A schematic diagram of the crushing mechanism according to another embodiment of the present invention is shown;

[0023] Figure 4 This diagram shows the overall structure of the gas suspension roasting furnace feeding device according to another embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the crushing mechanism according to another embodiment of the present invention is shown;

[0025] Figure 6 A schematic diagram of the feeding screw mechanism and the feeding section of another embodiment of the present invention is shown.

[0026] In the diagram: 1. Flue; 11. Gas feed section; 12. Bending section; 13. Feeding section; 2. Feeding screw mechanism; 3. Crushing mechanism; 31. Turntable body; 32. Crushing roller. Detailed Implementation

[0027] In the following detailed disclosure, these embodiments are fully described with reference to the accompanying drawings. In order to enable those skilled in the art to understand and clarify the technical solution of this utility model more clearly, the embodiments described below are not limited thereto. The present utility model will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0028] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] The first aspect of this application, as Figures 1-6 As shown, a gas suspension roasting furnace feeding device is provided, including a feeding screw mechanism 2. The output end of the feeding screw mechanism 2 extends into the flue 1, so that the material is fed into the high-speed airflow zone in the center of the flue 1.

[0031] The gas suspension roasting furnace feeding device provided in this embodiment includes a feeding screw mechanism 2. The output end of the feeding screw mechanism 2 extends into the flue 1, accurately feeding the material into the high-speed airflow zone in the center of the flue 1. The material can be carried away by the high-speed flue gas, avoiding the accumulation of material due to the near-wall effect, reducing the blockage in the flue 1. The central feeding improves the heating uniformity of the material, increases the utilization rate of the flue gas, and can handle materials with higher moisture content, thus improving efficiency.

[0032] The feed screw extends to the center of the flue section, and the central feeding reduces the temperature difference of the material and reduces the consumption of flue gas.

[0033] In one possible implementation, such as Figure 2 As shown, the flue 1 has a U-shaped structure and includes a gas feed section 11, a bend section 12 and a feeding section 13 connected in sequence. The bend section 12 is located at the bottom bend of the U-shaped structure.

[0034] Among them, the bend 12 serves as the bottom bend of the U-shaped flue 1. The bend structure extends the airflow path, prolongs the material residence time, and ensures the material drying effect.

[0035] In one possible implementation, such as Figure 1 , Figure 2 and Figure 4 As shown, the radius of the axial middle region of the feeding section 13 is greater than the radius of the end of the feeding section 13, and the output end of the feeding screw mechanism 2 extends to the near axis of the feeding section 13.

[0036] In this process, the diameter of the middle area of ​​flue 1 along the axial direction suddenly expands, which reduces the airflow velocity of the flue gas passing through it. After the material enters, large pieces of material fall down due to the low airflow velocity. At the inlet of the bend 12, they are lifted up by the high-temperature flue gas injected at high speed. In this reciprocating process, as the moisture is continuously vaporized, the solid blocks are dispersed and eventually carried away by the flue gas.

[0037] In this design, the output end of the feeding screw mechanism 2 extends to near the axis of the feeding section 13, allowing the fed material to directly contact the high-temperature flue gas injected at high speed. This increases the contact area between the material and the flue gas, improving the drying effect. The alignment of the feeding screw mechanism 2 with the axis of the flue 1 forms a near-coaxial injection structure, where the material particles are instantly enveloped by the high-speed airflow. This overcomes the airflow shadow zone problem present in traditional lateral feeding. The collision between the material and the airflow near the axis reduces the distribution entropy of the particle group in the cross-section of the flue 1 compared to off-axis feeding.

[0038] In one possible implementation, such as Figure 2As shown, the radius of the flue section where the output end of the feeding screw mechanism 2 is located is R, and the distance between the output end of the feeding screw mechanism 2 and the axis of the flue 1 is H, where 0≤H≤0.5R.

[0039] When the output end of the feeding screw mechanism 2 is close to the axis of the flue 1 (H≤0.5R), the material is directly injected into the core turbulent zone of the high-speed flue gas, significantly expanding the gas-solid contact area and improving the heat transfer rate. The flue gas kinetic energy density is highest in the axial region, and the material heating process proceeds synchronously from the inside out, effectively eliminating local overheating or uneven dehydration, and ensuring consistent product quality.

[0040] In one possible implementation, such as Figure 6 As shown, the cross-sectional radius of the flue where the output end of the feeding screw mechanism 2 is located is R. At least two feeding screw mechanisms 2 are symmetrically arranged relative to the axis of the flue 1. The distance between the output ends of the two feeding screw mechanisms 2 is 2H, where 0.2R≤2H≤0.5R.

[0041] Among them, at least two feeding screw mechanisms 2 are arranged symmetrically relative to the axis of flue 1 to form complementary material flow, avoid segregation or local accumulation caused by single-point feeding, and ensure that the material is evenly diffused on the cross section of the flue.

[0042] The distance between the output end of the feeding screw mechanism 2 and the axis of the flue 1 is H. The distance 2H between the output ends of the two feeding screw mechanisms 2 is related to the material diffusion radius r (H≈r). The constraint 0.2R≤2H≤0.5R corresponds to r≤0.25R, which ensures that the material covers the central area of ​​the flue 1. This not only avoids the material from being overly concentrated in the axial area, but also avoids the material from being deposited on the wall of the flue 1.

[0043] In one possible implementation, such as Figure 2 and Figure 4 As shown, a crushing mechanism 3 is provided inside the bend 12. The crushing mechanism 3 can rotate to crush the material that falls into the bend 12.

[0044] Among them, the crushing mechanism 3 breaks down large pieces of material into particle groups, accelerates moisture evaporation by increasing the specific surface area, forces the material to be crushed and repeatedly thrown, and realizes the cycle of crushing-drying-re-crushing. The fine powder produced by crushing enters the feeding section 13 with the rising airflow, avoiding the heat transfer blind zone caused by the accumulation of material at the bottom.

[0045] Understandably, the rotational speed of the crushing mechanism 3 is matched with the flue gas velocity to ensure that the material particle residence time meets the drying requirements.

[0046] In one possible implementation, such as Figures 2-5As shown, the crushing mechanism 3 includes a drive motor, a turntable body 31, and crushing rollers 32. The output end of the drive motor is poweredly connected to the turntable body 31 to drive the turntable body 31 to rotate. Several crushing rollers 32 are arranged on the material receiving surface of the turntable body 31. The crushing rollers 32 move with the turntable body 31 to interfere with the material.

[0047] The drive motor achieves dynamic matching between the rotation speed of the turntable body 31 and the flow of flue gas through frequency conversion control. After the material completes primary drying in the U-shaped flue 1, the large particles of material that have accumulated due to high moisture content fall into the return bend 12 due to gravity. The wet core particles fall into the U-shaped bend and are crushed by the crushing roller 32, thereby increasing the contact area between the material and the flue gas and improving the drying efficiency and drying effect.

[0048] In one possible implementation, such as Figure 2 and Figure 3 As shown, the turntable body 31 has a conical structure, with the conical surface of the turntable body 31 facing upwards, and several crushing rollers 32 are arranged at intervals along the circumference on the conical surface.

[0049] The centrifugal acceleration generated by the rotation of the conical turntable body 31, combined with the cone inclination angle, forms a combined force, causing substandard particles to automatically roll back to contact the cone surface, while qualified fine powder is thrown tangentially into the flue gas channel, realizing the integration of crushing and sorting. The cone inclination angle, together with the rotation of the crushing roller 32, forms a cyclone, which throws the adhering fine powder away from the receiving surface along the generatrix direction, avoiding the problem of material accumulation at the edge of the traditional horizontal turntable.

[0050] Furthermore, such as Figure 3 As shown, a number of primary rollers and a number of secondary rollers are provided on the conical surface, and the primary rollers and secondary rollers are arranged alternately along the circumference.

[0051] Among them, the crushing roller 32 can be a long strip protrusion. The primary roller has a larger height and length, which bears the initial impact crushing of large pieces of material and reduces the volume of material through high-intensity crushing. The secondary roller has a smaller height and length, which then completes fine particle grinding, forming a force field gradient of coarse crushing and fine grinding. The alternating layout allows the material to undergo two crushing interventions with different intensities within a single rotation cycle.

[0052] In this process, as the conical surface rotates, the circumferential height difference between the primary and secondary rollers creates a step-like crushing trajectory. As the material slides down the conical surface, it is captured successively by rollers of different diameters, preventing small particles from entering the fine grinding zone prematurely and causing over-crushing. The alternating roller group forms a natural screening screen, allowing qualified crushed particles to be directly thrown into the flue gas flow through the roller gap, while coarse particles are guided back and fall by the conical surface, reducing the rate of repeated crushing.

[0053] In one possible implementation, such as Figure 4 and Figure 5As shown, the turntable body 31 has a frustum structure, with the upper end face and frustum surface of the turntable body 31 facing upwards, and a number of crushing rollers 32 are arranged circumferentially at intervals on the frustum surface and / or the upper end face.

[0054] The truncated cone structure of the turntable body 31 can reduce obstruction of flue gas, allowing flue gas to pass smoothly through the bend 12 and reducing eddy currents. The crushing roller 32 can be a long strip protrusion, set on the truncated cone surface and / or the upper end surface, to bear the impact crushing of large pieces of material. Through high-intensity crushing, the volume of material is reduced, the contact area between material and flue gas is increased, and the drying efficiency and drying effect are improved.

[0055] A second aspect of this application provides a roasting furnace, including a gas suspension roasting furnace feeding device according to any one of the second aspects.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0058] In view of the detailed description above, these and other changes can be made to these embodiments. This written description includes embodiments of the best mode disclosed in this utility model. The patent scope of this utility model is defined by the claims, which are not limited by this disclosure. The protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in this utility model, based on the technical solution and concept of this utility model, are within the protection scope of this utility model.

Claims

1. A feeding device for a gas suspension roasting furnace, characterized in that, It includes a feeding screw mechanism (2), the output end of which extends into the flue (1) to feed the material into the high-speed airflow zone in the center of the flue (1).

2. The gas suspension roasting furnace feeding device according to claim 1, characterized in that, The flue (1) is U-shaped and includes a gas feed section (11), a bend section (12) and a feeding section (13) connected in sequence. The bend section (12) is located at the bottom bend of the U-shaped structure.

3. The gas suspension roasting furnace feeding device according to claim 2, characterized in that, The radius of the axial middle region of the feeding part (13) is greater than the radius of the end of the feeding part (13), and the output end of the feeding screw mechanism (2) extends to the near axis of the feeding part (13).

4. The gas suspension roasting furnace feeding device according to claim 3, characterized in that, The output end of the feeding screw mechanism (2) is located in the flue section with a radius of R, and the distance between the output end of the feeding screw mechanism (2) and the axis of the flue (1) is H, where 0≤H≤0.5R.

5. The gas suspension roasting furnace feeding device according to claim 3, characterized in that, The output end of the feeding screw mechanism (2) is located in the flue section with a radius of R. At least two feeding screw mechanisms (2) are symmetrically arranged relative to the axis of the flue (1). The distance between the output ends of the two feeding screw mechanisms (2) is 2H, where 0.2R≤2H≤0.5R.

6. The gas suspension roasting furnace feeding device according to any one of claims 2-5, characterized in that, The bend (12) is provided with a crushing mechanism (3), which can rotate to crush the material that falls into the bend (12).

7. The gas suspension roasting furnace feeding device according to claim 6, characterized in that, The crushing mechanism (3) includes: Drive motor; The turntable body (31) is powered by the output end of the drive motor connected to the turntable body (31) to drive the turntable body (31) to rotate. Crushing rollers (32), a plurality of the crushing rollers (32) are disposed on the material receiving surface of the turntable body (31), the crushing rollers (32) move with the turntable body (31) to interfere with the material.

8. The gas suspension roasting furnace feeding device according to claim 7, characterized in that, The turntable body (31) has a conical structure, with the conical surface of the turntable body (31) facing upwards, and a plurality of the crushing rollers (32) are arranged at intervals along the circumference on the conical surface.

9. The gas suspension roasting furnace feeding device according to claim 7, characterized in that, The turntable body (31) is a frustum structure, with the upper end face and frustum face of the turntable body (31) facing upwards, and a plurality of crushing rollers (32) arranged circumferentially at intervals on the frustum face and / or the upper end face.

10. A roasting furnace, characterized in that, Includes the gas suspension roasting furnace feeding device as described in any one of claims 1-9.

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