Distributing device and aluminum hydroxide gaseous suspension roasting device comprising same

Abstract

A material mixing channel is suitable for forming fluid from bottom to top, a side chamber is arranged on the side wall of the material mixing channel in a concave mode, the lower end and the upper end of the material mixing channel are an airflow inlet and a mixed flow outlet respectively, and a feeding bevel opening is formed in the side, deviating from the material mixing channel, of the upper end of the side chamber. The stepped material distribution table is provided with at least two steps suitable for inclined material flowing, the at least two steps descend step by step in the direction towards the material mixing channel, and the upper end of the step at the high position is suitable for receiving materials falling from the inclined feeding opening. Compared with the prior art, the material divergence is improved, the cyclone material reduction mixing amount of the gas-solid mixed flow is improved, and / or the uniformity of the gas-solid mixed flow is improved, more uniform and more sufficient heat exchange is achieved, efficient waste heat utilization is achieved, and energy saving is achieved.

Description

Technical Field

[0001] This utility model relates to the gaseous suspension roasting of aluminum hydroxide, and more particularly to a feeder and an apparatus for gaseous suspension roasting of aluminum hydroxide including the feeder. Background Technology

[0002] Mining companies producing aluminum hydroxide and similar products often use cyclones. The material settled by the cyclone is suitable for mixing and re-airing before entering a new cyclone stage or a roasting furnace. This mixing and re-airing occurs in the material distributor (material distribution mechanism).

[0003] Reference Figure 6 The existing material distributor shown has a re-air supply at the lower end. The re-air supply can be fresh air (normal temperature and pressure air) or hot air that will absorb residual heat. The re-air supply flows from top to bottom. The side wall of the material distributor is suitable for inserting a cyclone depressurizer. The cyclone depressurizer is suitable for being mixed with the new air flow. Therefore, the fresh air and the hot air are called re-air.

[0004] Reference Figure 6 The existing material distributor shown has a side chamber recessed in its side wall, with the inner bottom of the side chamber serving as a support platform. Cyclone material falls into the side chamber in a waterfall-like manner; the re-airflow then removes the surface layer of the cyclone material, leaving only the side of the waterfall facing the re-airflow as the actual material dispersion surface. In this method, the material falling waterfall is not sufficiently dispersed, and the gas-solid mixture formed by the re-airflow is not uniform. Specifically, the distance between the distributor outlet and subsequent equipment is relatively short, resulting in uneven material dispersion and directly causing uneven gas-solid mixture. Furthermore, the insufficient material intake by the re-airflow also contributes to the sparse and uneven gas-solid mixture. Therefore, the existing material distributor has an uneven gas-solid mixture, and the waste heat from the re-airflow cannot be fully absorbed and utilized. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems mentioned above, and provides a feeder and an aluminum hydroxide gas suspension calcination device including the feeder, which improves the dispersion of the feed, allows the feed to be quickly and fully mixed into the reflow, and improves the feed mixing amount and / or the uniformity of the gas-solid mixture in the reflow.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A material distributor includes a mixing channel and a stepped distribution platform. The mixing channel is adapted to form a fluid flowing from bottom to top. A side chamber is recessed in the side wall of the mixing channel. The lower end and the upper end of the mixing channel are respectively an airflow inlet and a mixing outlet. A feed inlet is provided on the upper end of the side chamber, offset from the mixing channel. The stepped distribution platform is provided with at least two steps adapted to tilt the material flow. The at least two steps descend in stages in the direction towards the mixing channel. The upper end of the higher step (upper step) is adapted to receive the material falling from the feed inlet.

[0008] Compared with the prior art, the beneficial effects of this application include: the material is spread and diffused step by step in a tumbling manner, the stepped distribution platform makes the material dispersed in multiple stages, the material that is still tumbling is fully and quickly sucked in and mixed by the airflow based on the relatively dispersed state, some material is quickly released into the airflow in the step-by-step waterfall, increasing the amount of material mixed in the cyclone of the gas-solid mixture, and / or improving the uniformity of the gas-solid mixture, achieving more uniform and more complete heat exchange, achieving efficient waste heat utilization, and realizing energy saving.

[0009] As an improvement to the above technical solution, the step is an arched plate that is high in the middle and low on both sides.

[0010] As an improvement to the above technical solution, the step is divided into a front area and a rear area along the inclined downward direction. The front area is provided with a main area and side areas located on both sides of the main area. The main area is a limiting flow channel suitable for material rolling and dispersion.

[0011] As an improvement to the above technical solution, the limiting flow channel of odd-numbered steps is wider than that of even-numbered steps.

[0012] As an improvement to the above technical solution, an operation port is provided on the side wall of the side chamber. The operation port is suitable for disassembling and assembling the stepped fabric platform, and / or for cleaning the side chamber and the feed inlet. The operation port is detachably encapsulated with a door panel.

[0013] As an improvement to the above technical solution, the side chamber and / or the mixing channel are provided with an observation window, the observation window is encapsulated with a light-transmitting plate, and the observation window is suitable for viewing the stepped fabric distribution table.

[0014] As an improvement to the above technical solution, an adjustment screw is also included. One end of the stepped fabric platform is hinged to the inner wall of the side chamber, and a sliding groove is provided on the lower side of the other end. The adjustment screw passes through the bottom of the side chamber in a threaded connection manner. The adjustment screw abuts against the sliding groove upward to support the other end of the stepped fabric platform. The adjustment screw is adapted to adjust the inclination of the stepped fabric platform.

[0015] On the other hand, an aluminum hydroxide gaseous suspension calcination apparatus includes a feeding mechanism, a preheating cyclone, and a calcination furnace. The side wall of the calcination furnace is provided with the aforementioned distributor. The preheating cyclone is adapted to input the gas-solid mixture flow of the feeding mechanism. The feeding mechanism is adapted to supplement the hot smoke discharged by the preheating cyclone. The cyclone discharge of the preheating cyclone is adapted to pass through the distributor to form a new gas-solid mixture flow in the upper region of the inner chamber of the calcination furnace.

[0016] As an improvement to the above technical solution, it also includes a first and a second material-falling cyclone. The gas-solid mixture flow of the feeding mechanism is adapted to be introduced into the second material-falling cyclone. The first material-falling cyclone is adapted to receive the gas-solid mixture discharged from the roasting furnace. A distributor receives the cyclone material falling from the second material-falling cyclone and the hot air from the first material-falling cyclone. The distributor is adapted to supplement its gas-solid mixture flow into the preheating cyclone.

[0017] As an improvement to the above technical solution, it also includes one or more connected cooling cyclones. The intermediate cooling cyclones are adapted to be supplied with the exhaust air of the next cooling cyclone and the material drop of the previous cooling cyclone through the corresponding material distributor. The last cooling cyclone is adapted to be supplied with fresh air and the material drop of the previous cooling cyclone through the corresponding material distributor. The first cooling cyclone is adapted to be supplied with the exhaust air of the next cooling cyclone and the material drop of the first material drop cyclone. Attached Figure Description

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a flowchart of the aluminum hydroxide gaseous suspension calcination apparatus according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A schematic diagram of the feeder structure of the aluminum hydroxide gas suspension calcination device is shown.

[0021] Figure 3 for Figure 2 A schematic diagram of the structure behind the concealed door panel of the fabric feeder is shown;

[0022] Figure 4 for Figure 2 A cross-sectional view of the fabric feeder is shown;

[0023] Figure 5 for Figure 2 An exploded view of the fabric feeder is shown;

[0024] Figure 6 This is a schematic diagram of an existing fabric feeder.

[0025] The accompanying drawings are only one specific embodiment of this utility model, and the form and structure of this specific embodiment should not limit the extension of other embodiments.

[0026] Mixing channel 100, airflow inlet 110, mixing outlet 120;

[0027] The room is recessed with a side chamber 200, a feed inlet 210, an operating opening 220, and a door panel 230.

[0028] Stepped fabric platform 300, steps 310, front area 311, main area 311a, side area 311b, rear area 312;

[0029] The roasting furnace is P04, the first material-lowering cyclone is P03, the preheating cyclone is P02, and the second material-lowering cyclone is P01. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Reference Figures 2 to 5 This utility model provides a material distributor, including a mixing channel 100 and a stepped material distribution platform 300. The mixing channel 100 is adapted to form a fluid flowing from bottom to top. A side chamber 200 is recessed in the side wall of the mixing channel 100. The lower end and the upper end of the mixing channel 100 are respectively an airflow inlet 110 and a mixing outlet 120. A feed inlet 210 is provided on the upper end of the side chamber 200, which is offset from the mixing channel 100. The stepped material distribution platform 300 is provided with at least two steps 310 adapted to inclined material flow. The at least two steps 310 descend step by step in the direction toward the mixing channel 100. The upper end of the higher step 310 (upper step 310) is adapted to receive the material falling from the feed inlet 210.

[0032] It is understandable that the feed inlet 210 is connected to the bottom discharge port of the corresponding cyclone.

[0033] The operation process of this utility model can be as follows: (Refer to...) Figures 2 to 5 The cyclone material falls into the feed inlet at an angle of 210 in the direction of V. 11 ;

[0034] The direction of the airflow flowing into the lower end of the mixing channel 100 is V. 12 ;

[0035] The multiple steps 310 of the stepped material distribution table 300 are defined from top to bottom as level 1, level 2, ..., level X, ..., level N. The upper end of the level 1 step 310 receives the cyclone material drop inserted by the feed inlet 210.

[0036] On the first step 310, the cyclone material flows along the first step 310 along the initial inertia and the inclination of the first step 310, and some of it disperses to both sides. The surface cyclone material of the first step 310 escapes to the mixing channel 100. Among them, the material dispersed on both sides is suitable for the escape airflow, that is, the material on the first step 310 mainly falls to the second step 310 along the axis.

[0037] The secondary step 310 receives the material falling from the primary step 310. The material falls along the secondary step 310 due to its initial inertia and the inclination of the secondary step 310, and some of it disperses to both sides. The surface cyclone material of the secondary step 310 escapes to the mixing channel 100. The material dispersed to both sides is suitable for the escape airflow. That is, the material on the secondary step 310 mainly falls to the tertiary step 310 along the axis.

[0038] The surface cyclone of the waterfall between the second-level step 310 and the first-level step 310 flows into the mixing channel 100;

[0039] And so on;

[0040] The X-level step 310 receives the material falling from the X-1 level step 310. The material, along with its initial inertia and the inclination of the X-level step 310, tumbles along the X-level step 310 and partially disperses to both sides. The surface cyclone material of the X-level step 310 escapes to the mixing channel 100. The material dispersed to both sides is suitable for the escaping airflow. That is, the material on the X-level step 310 mainly falls along the axis to the X+1 level step 310.

[0041] The surface cyclone of the waterfall between the X-level step 310 and the X-1 level step 310 flows into the mixing channel 100;

[0042] N-level step 310 receives the material falling from N-1 level step 310. The material falls along the N-level step 310 due to its initial inertia and the inclination of N-level step 310, and partially disperses to both sides. The cyclone material falling on X-level step 310 escapes to the mixing channel 100.

[0043] Based on the airflow suction of the mixing channel 100, the materials dispersed from each step 310 escape into the mixing channel 100, and the mixing channel 100 forms a gas-solid mixed flow. The discharge direction of this gas-solid mixed flow in the mixing channel 100 is shown in the V2 direction.

[0044] Compared with the prior art, the beneficial effects of this application include: the material is spread and diffused step by step in a tumbling manner, the stepped material distribution platform 300 makes the material dispersed in multiple stages, the tumbling material is fully and quickly sucked in and mixed by the airflow based on the relatively dispersed state, some material is quickly released into the airflow in the step-by-step waterfall, increasing the amount of material mixed in the cyclone of the gas-solid mixture, and / or improving the uniformity of the gas-solid mixture, achieving more uniform and more complete heat exchange, achieving efficient waste heat utilization, and realizing energy saving.

[0045] Reference Figure 1 The diagram shows multiple points A where a material distributor (material distribution mechanism) is installed. The material settled by the cyclone is suitable for fully and quickly mixing with the hot flue gas, so as to realize the full recovery and reuse of the waste heat of the hot flue gas, achieve efficient waste heat utilization, and realize energy saving.

[0046] When step 310 is an inclined plane, the material can disperse to both sides, mainly due to the disordered squeezing between material particles and the splashing during cascading landing. In some embodiments of this utility model, step 310 is an arched plate with a high center and low sides, that is, the cross-section of step 310 is an arch shape with a high center and low sides. In this utility model, the arched plate extends inclinedly, preserving the original inertial direction of the material's rolling motion, and the arching of step 310 enhances the uniformity of the material's dispersion to both sides.

[0047] The tiered fabric platform 300, arranged from highest to lowest, has at least two steps 310. (Refer to...) Figures 3 to 5 In some embodiments of this utility model, the step 310 is divided into a front zone 311 and a rear zone 312 along the inclined downward direction. The front zone 311 is provided with a main zone 311a and side zones 311b located on both sides of the main zone 311a. The main zone 311a is a limiting flow channel suitable for material rolling and dispersion, and is essentially the main material zone of the front zone 311. The front zone 311 intervenes in dispersion. When the feed inlet 210 abnormally discharges a strong cyclone of falling material, it avoids the dispersion of an excessively thick layer of falling material on both sides of the front zone 311, and ensures that the material dispersed on both sides of the front zone 311 is fully dispersed. The rear zone 312 is suitable for natural rolling and side dispersion of falling material. The side dispersion of the rear zone 312 is difficult to be excessive. The material in the rear zone 312 is mainly rolling material following the inertia of the main zone 311a, so that the middle of the lower step 310 receives most of the material, and the sides receive some but not excessive dispersed material.

[0048] Reference Figures 3 to 5 In some embodiments of this invention, the limiting flow channel of the odd-numbered steps 310 is wider than that of the even-numbered steps 310. This greatly prevents the concentrated tumbling material from spreading to both sides into an excessively thick material layer.

[0049] Reference Figure 2 , Figure 3 In some embodiments of this utility model, the side wall of the side chamber 200 is provided with an operation port 220. The operation port 220 is suitable for disassembling and assembling the stepped fabric platform 300, and / or suitable for cleaning the side chamber 200 and the feed inlet 210. The operation port 220 is detachably enclosed with a door panel 230.

[0050] In some embodiments of this utility model, the side chamber 200 and / or the mixing channel 100 are provided with observation windows, the observation windows are encapsulated with light-transmitting plates, and the observation windows are suitable for viewing the stepped fabric table 300.

[0051] In some embodiments of this utility model, an adjusting screw is also included. One end of the stepped material distribution table 300 is hinged to the inner wall of the side chamber 200, and a sliding groove is provided on the lower side of the other end. The adjusting screw passes through the bottom of the side chamber 200 by means of a threaded connection, which solves the sealing problem between the side chamber 200 and the mixing channel 100. The adjusting screw pushes upward against the sliding groove to support the other end of the stepped material distribution table 300. The adjusting screw is suitable for adjusting the inclination of the stepped material distribution table 300.

[0052] In some configurations, the stepped fabric platform 300 has an adjustable tilt. The inner wall and / or inner bottom of the side chamber 200 are provided with limiting structures suitable for restricting the movement of the stepped fabric platform 300, such as grooves or hooks. The door panel 230 and the side wall of the side chamber 200 together restrict the lateral movement of the stepped fabric platform 300, that is, the door panel 230 and the side wall of the side chamber 200 clamp the stepped fabric platform 300.

[0053] Reference Figure 1 A gaseous suspension calcination device for aluminum hydroxide includes a feeding mechanism, a preheating cyclone PO2, and a calcination furnace PO4. The side wall of the calcination furnace PO4 is equipped with the aforementioned material distributor. It is understood that the calcination furnace PO4 is equipped with a burner, and the bottom of the calcination furnace PO4 is equipped with an air inlet. An upward airflow is formed inside the calcination furnace PO4. The inner cavity of the calcination furnace PO4 is presented as a mixing channel 100. The preheating cyclone PO2 is suitable for inputting the gas-solid mixture flow into the feeding mechanism. The feeding mechanism is suitable for supplementing the hot smoke discharged by the preheating cyclone PO2 to form a local small circulation. The cyclone drop of the preheating cyclone PO2 is suitable for passing through the material distributor to form a new gas-solid mixture flow in the upper region of the inner cavity of the calcination furnace PO4. That is, hot air is blown upward from the bottom of the calcining furnace P04, and the cyclone material introduced by the material distributor on the side wall of the calcining furnace P04 is suitable for absorbing the residual heat of the hot air, thereby forming a gas-solid mixture with new heat and flowing into the upper zone of the calcining furnace P04. The new gas-solid mixture is fully and rapidly reheated and reacted at the base temperature and in a gaseous suspension state. The gaseous suspended aluminum hydroxide is fully and rapidly decomposed to obtain aluminum oxide and water.

[0054] Reference Figure 1 The feeding mechanism adopts a screw feeding method and includes a mixer and a screw feeder.

[0055] It also includes a first descending cyclone P03 and a second descending cyclone P01. The gas-solid mixture flow of the feeding mechanism is adapted to be introduced into the second descending cyclone P01. The first descending cyclone P03 is adapted to receive the gas-solid mixture discharged from the roasting furnace P04. A distributor receives the cyclone descending material from the second descending cyclone P01 and also receives the hot air from the first descending cyclone P03. The distributor is adapted to supplement its gas-solid mixture flow into the preheating cyclone P02. That is, the gas-solid mixture flow discharged from the mixer is processed by the second descending cyclone P01 and the corresponding distributor to transform into a new gas-solid mixture flow, which is then introduced into the preheating cyclone P02.

[0056] Reference Figure 1 It also includes one or more connected cooling cyclones. The intermediate cooling cyclones are adapted to be supplied with the exhaust air of the next cooling cyclone and the material drop of the previous cooling cyclone through the corresponding material distributor. That is, the exhaust air of the next cooling cyclone and the material drop of the previous cooling cyclone form a gas-solid mixed flow to supply the intermediate cooling cyclone. The last cooling cyclone is adapted to be supplied with fresh air and the material drop of the previous cooling cyclone through the corresponding material distributor. The first cooling cyclone is adapted to be supplied with the exhaust air of the next cooling cyclone and the material drop of the first material drop cyclone P03.

[0057] Reference Figure 1 The aluminum hydroxide gaseous suspension roasting device is equipped with four cooling cyclones, from CO1 to CO4.

[0058] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the scope of the technical solution of this utility model.

Claims

1. A fabric feeder, characterized in that, include: A mixing channel is adapted to form a fluid flowing from bottom to top. The side wall of the mixing channel is recessed with a side chamber. The lower end and the upper end of the mixing channel are respectively the airflow inlet and the mixing outlet. The upper end of the side chamber is provided with a feed inlet on one side away from the mixing channel. The stepped feeding platform is provided with at least two steps suitable for inclined material flow. The at least two steps descend in a step-by-step manner toward the mixing channel, and the upper end of the higher step is suitable for receiving the material falling from the feed inlet.

2. The fabric feeder according to claim 1, characterized in that, The steps are arched slabs that are higher in the middle and lower on both sides.

3. The fabric feeder according to claim 2, characterized in that, The steps are divided into a front zone and a rear zone along the inclined downward direction. The front zone is provided with a main zone and side zones located on both sides of the main zone. The main zone is a limiting flow channel suitable for material tumbling and dispersion.

4. The fabric feeder according to claim 3, characterized in that, The limiting flow channel of odd-numbered steps is wider than that of even-numbered steps.

5. The fabric feeder according to any one of claims 1 to 4, characterized in that, An operating port is provided on the side wall of the side chamber. The operating port is suitable for disassembling and assembling the stepped fabric platform, and / or for cleaning the side chamber and the feed inlet. The operating port is detachably enclosed with a door panel.

6. The fabric feeder according to claim 5, characterized in that, The side chamber and / or the mixing channel are provided with an observation window, the observation window is enclosed with a light-transmitting plate, and the observation window is suitable for viewing the stepped fabric distribution table.

7. The fabric feeder according to claim 5, characterized in that, It also includes an adjustment screw. One end of the stepped fabric platform is hinged to the inner wall of the side chamber, and the lower side of the other end is provided with a sliding groove. The adjustment screw passes through the bottom of the side chamber by means of a threaded connection. The adjustment screw abuts against the sliding groove upward to support the other end of the stepped fabric platform. The adjustment screw is adapted to adjust the inclination of the stepped fabric platform.

8. A gaseous suspension roasting apparatus for aluminum hydroxide, characterized in that, The device includes a feeding mechanism, a preheating cyclone, and a roasting furnace. The side wall of the roasting furnace is provided with a distributor as described in any one of claims 1 to 7. The preheating cyclone is adapted to input the gas-solid mixture flow of the feeding mechanism. The feeding mechanism is adapted to supplement the hot smoke discharged by the preheating cyclone. The cyclone discharge of the preheating cyclone is adapted to pass through the distributor to form a new gas-solid mixture flow in the upper region of the inner chamber of the roasting furnace.

9. The aluminum hydroxide gaseous suspension roasting apparatus according to claim 8, characterized in that, It also includes a first and a second material-falling cyclone, the gas-solid mixture flow of the feeding mechanism is adapted to be introduced into the second material-falling cyclone, the first material-falling cyclone is adapted to receive the gas-solid mixture discharged from the roasting furnace, and a distributor receives the cyclone falling material of the second material-falling cyclone and the hot air of the first material-falling cyclone, the distributor being adapted to supplement its gas-solid mixture flow into the preheating cyclone.

10. The aluminum hydroxide gaseous suspension roasting apparatus according to claim 8, characterized in that, It also includes one or more connected cooling cyclones, the intermediate cooling cyclones being adapted to receive exhaust air from the next cooling cyclone and material from the previous cooling cyclone via a corresponding material distributor, the last cooling cyclone being adapted to receive fresh air and material from the previous cooling cyclone via a corresponding material distributor, and the first cooling cyclone being adapted to receive exhaust air from the next cooling cyclone and material from the first material-falling cyclone.

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