Bottom bed discharge hole device of fluidized bed for aluminum fluoride production

Abstract

The utility model relates to the technical field of aluminum fluoride production equipment, in particular to a fluidized bed bottom bed discharge port device for aluminum fluoride production, which is structurally characterized in that a discharge pipe is fixedly mounted on the outer wall of a fluidized bed bottom bed body and communicated with the fluidized bed bottom bed body, the discharge pipe is inclined downwards, an L-shaped ball valve and a star-shaped discharger are mounted on the discharge pipe, and the star-shaped discharger is communicated with the discharge pipe. And the L-shaped ball valve is arranged on the discharge pipe close to the feed port. And the star discharger is positioned at the downstream of the L-shaped ball valve. The discharging pipe is communicated with the bottom bed body of the fluidized bed through the designed position and angle, continuous and stable material flow is formed through the gravity of materials and gas power, the star-shaped discharger is adopted to abut against the L-shaped ball valve combination to control the materials to flow out, faults and maintenance caused by abrasion are reduced, the discharging speed can be linearly, sensitively, accurately and continuously controlled, and the discharging efficiency is improved. Reaction gas leakage and air backflow are effectively prevented, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of aluminum fluoride production equipment, and in particular to a fluidized bed bottom discharge port device for aluminum fluoride production. Background Technology

[0002] The fluidized bed is the core equipment in the dry process of aluminum fluoride production, and its stable operation plays a crucial role in aluminum fluoride production. The fluidized bed bottom discharge device also has an indispensable function and location. It is not merely a simple "discharge port"; it is a vital component in the dry process of aluminum fluoride production, connecting the core reaction with subsequent processes, maintaining bed stability, ensuring product quality, and achieving continuous production. Its design and operation directly affect the efficiency, stability, safety, and ultimate economic benefits of the entire fluidized bed reactor and even the entire production line. Ensuring the stable, reliable, and controllable operation of the discharge device is of paramount importance in aluminum fluoride production management.

[0003] In traditional aluminum fluoride production, the fluidized bed discharge port is typically controlled by a slide gate valve. The advantages of slide gate valves lie in their full-bore and complete shut-off capabilities, making them particularly suitable for complete system isolation during maintenance. However, they suffer from insufficient sealing performance, leading to material leakage or gas backflow. The sealing of a single slide gate valve relies mainly on the fit between the slide gate and the valve seat. However, the fluidized bed is usually under positive pressure or experiences airflow turbulence, making it prone to gaps between the slide gate and valve seat due to wear, deformation, or material accumulation. This can lead to aluminum fluoride dust leakage, polluting the environment, increasing material loss, and potentially posing health risks to operators. If external air flows back in, it can affect the reaction atmosphere within the fluidized bed (e.g., an oxidizing environment), causing fluctuations in product quality. Furthermore, the high temperature and corrosive environment of aluminum fluoride production, typically above 600℃, and the presence of corrosive gases such as hydrogen fluoride in the material, make the sealing material of a single slide gate valve susceptible to aging and corrosion failure due to high temperatures, further reducing sealing reliability. Existing slide gate valves, used for controlling the material structure at the fluidized bed outlet, suffer from low flow control accuracy and difficulty adapting to dynamic fluidized bed conditions. Their opening adjustment sensitivity is insufficient; flow regulation is achieved through slide gate translation, resulting in a poor linear relationship between opening and flow, especially prone to "jamming" or "material leakage" at small openings. They also cannot handle pressure fluctuations. During fluidized bed operation, the pressure fluctuates due to airflow distribution and changes in material fluidization. Single slide gate valves lack a pressure compensation mechanism; sudden pressure increases may lead to a large instantaneous discharge of material, or pressure drops may interrupt discharge, disrupting production continuity. Furthermore, single slide gate valves are easily clogged by material, affecting production efficiency. Aluminum fluoride particles can become sticky due to moisture absorption and high-temperature sintering, resulting in high fine powder content. If the outlet channel of a single slide gate valve is designed as rectangular or narrow-slit, material accumulation can easily form at the slide gate edge or valve seat corner. Finally, they lack material unblocking capabilities. Single slide gate valves only have on / off or regulating functions and lack auxiliary unblocking structures such as rotary valves and arch-breaking devices, making them poorly adaptable to viscous or agglomerated materials. They also suffer from high maintenance frequency and short equipment lifespan. Aluminum fluoride particles are abrasive materials; during frequent opening and closing, the slide gate's surface wears down due to friction with the valve seat. Simultaneously, high-temperature corrosive gases accelerate the oxidation and corrosion of metal components, shortening the failure cycle of the valve's sealing surface. Seal replacement is difficult. Seals in single slide gate valves, such as packing and sealing rings, are typically installed inside the valve body. If they fail under high-temperature conditions, replacement requires disassembling the entire valve body, a complex and time-consuming process. If a single slide gate valve malfunctions (such as slide gate detachment or seal failure) and causes a large amount of material to be rapidly discharged, it may trigger bed collapse within the fluidized bed, or even cause equipment vibration and pipeline rupture due to airflow fluctuations, leading to safety accidents. Summary of the Invention

[0004] The purpose of this invention is to provide a fluidized bed bottom discharge port device for aluminum fluoride production, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the original slide gate valve at the discharge port of this utility model is eliminated, and a combined valve scheme is adopted, which is specifically achieved through the following technical solution:

[0006] The fluidized bed bottom discharge port device for aluminum fluoride production has the following structure: the discharge pipe 1 is fixedly installed on the outer wall of the fluidized bed bottom 5 and connected to the fluidized bed bottom 5. The discharge pipe 1 is inclined downwards and is equipped with an L-type ball valve 2 and a star-shaped unloader 3.

[0007] Preferably, the discharge pipe 1 is inclined downward at a 45° angle to the outer wall of the fluidized bed bottom 5.

[0008] Preferably, the L-shaped ball valve 2 is installed on the discharge pipe 1 near the inlet.

[0009] Preferably, the star-shaped unloader 3 is installed on the discharge pipe 1 downstream of the L-shaped ball valve 2.

[0010] Preferably, the center of the discharge pipe is located 100mm above the first layer of air distribution plate 4 installed in the bottom of the fluidized bed.

[0011] Preferably, the L-type ball valve 2 and the rotary valve 3 are connected to the discharge pipe 1 via flanges.

[0012] By adopting the above technical solution, this utility model has the following technical effects:

[0013] This invention connects the discharge pipe to the fluidized bed substrate through its designed position and angle, injecting a small amount of fluidizing air or aeration air (as in existing equipment) to fluidize the material. Utilizing the material's own gravity and gas dynamics, a continuous and stable material flow is formed. A star-shaped discharger, combined with an L-shaped ball valve, controls material discharge. Compared to a single slide gate valve, this significantly reduces wear-related failures and maintenance, improving long-term reliability under harsh conditions. The structure is simple, eliminating the risk of precision mechanical parts deforming or jamming due to heat. It can stably handle high-temperature materials of 450-600℃, and linear, sensitive, and precise operation can be achieved by adjusting the aeration rate. Continuous control of the discharge rate and sustained aeration help maintain material flow and prevent accumulation, bridging, or agglomeration within the valve. Located downstream of the L-type ball valve, the rotary valve's rotating blades scrape material from the inlet to the outlet. The blades and housing form sealed chambers with excellent sealing performance, preventing the leakage of reactive gases and effectively blocking the leakage of high-temperature, toxic, and corrosive gases containing HF from the fluidized bed. Preventing backflow, the rotary valve achieves relatively accurate volumetric metering and stable conveying of solid materials, complementing and ensuring the flow regulation of the L / J valve, providing a stable material flow for subsequent cooling or conveying. The combination of the rotary valve downstream of the L-type ball valve significantly extends the equipment's service life. The L-type ball valve withstands the most severe operating conditions, protecting the relatively precise and expensive rotary valve by preventing it from directly contacting the highest temperature and wear areas. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram, 1 is the discharge pipe, 2 is the L-shaped ball valve, 3 is the rotary valve, 4 is the bottom air distribution plate, and 5 is the fluidized bed bottom. Detailed Implementation

[0016] 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.

[0017] like Figure 1 As shown, the fluidized bed bottom discharge port device for aluminum fluoride production of this utility model has the following structure: The discharge pipe 1 is fixedly installed on the outer wall of the fluidized bed bottom 5 and communicates with the fluidized bed bottom 5. The discharge pipe 1 is inclined downwards, and an L-shaped ball valve 2 and a rotary valve 3 are installed on the discharge pipe 1. The discharge pipe 1 is inclined downwards at a 45° angle to the outer wall of the fluidized bed bottom 5. The L-shaped ball valve 2 is located on the discharge pipe 1 near the inlet. The rotary valve 3 is located downstream of the L-shaped ball valve 2 on the discharge pipe 1.

[0018] The center of the aforementioned discharge pipe 1 is located 100mm above the first layer of air distribution plate 4 installed in the fluidized bed. The aforementioned L-type ball valve 2 and rotary valve 3 are connected to the discharge pipe 1 via flanges.

[0019] The working principle of this utility model is as follows: After aluminum hydroxide reacts with hydrogen fluoride gas, the resulting aluminum fluoride particles sink to the bottom due to their weight, forming a high-concentration discharge zone. The fluidizing gas introduced at the bottom pushes the particles to move directionally towards the low-pressure zone (the end of the discharge pipe). The material is then transported to the aluminum fluoride cooling device for cooling through an L-shaped ball valve and a star-shaped unloader.

Claims

1. A fluidized bed bottom outlet apparatus for the production of aluminum fluoride, characterized in that The structure is as follows: the discharge pipe (1) is fixedly installed on the outer wall of the fluidized bed bottom (5) and connected to the fluidized bed bottom (5). The discharge pipe (1) is set downwards at an angle. An L-type ball valve (2) and a star-shaped unloader (3) are installed on the discharge pipe (1).

2. The fluidized bed bottom outlet for aluminum fluoride production apparatus according to claim 1, characterized in that The discharge pipe (1) is inclined downward at a 45° angle to the outer wall of the fluidized bed bottom (5).

3. The fluidized bed bottom discharge port device for aluminum fluoride production according to claim 1, characterized in that... The L-shaped ball valve (2) is installed on the discharge pipe (1) near the inlet.

4. The fluidized bed bottom discharge port device for aluminum fluoride production according to claim 1 or 3, characterized in that... The star-shaped unloader (3) is located on the discharge pipe (1) downstream of the L-shaped ball valve (2).

5. The fluidized bed bottom discharge port device for aluminum fluoride production according to claim 1, 2 or 3, characterized in that... The center of the discharge pipe (1) is located 100 mm above the first layer of air distribution plate (4) set in the bottom of the fluidized bed.

6. The fluidized bed bottom discharge port device for aluminum fluoride production according to claim 1 or 3, characterized in that... The L-type ball valve (2) and the rotary valve (3) are connected to the discharge pipe (1) via flanges.

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