A disc-shaped aeration structure based on a reaction tank

Abstract

The utility model discloses a disc -shaped aeration structure based on reaction groove relates to wet process phosphoric acid process equipment technical field, this disc -shaped aeration structure based on reaction groove includes reaction groove body, sets up in the disc -shaped groove of reaction groove body bottom and with the center annular arrangement of disc -shaped groove, the center island that the inner ring part of disc -shaped groove is formed in the reaction groove body bottom protruding, and the aeration mechanism of setting up on center island and communicating with outside through pipeline. The utility model discloses through the cooperation of disc -shaped groove and aeration mechanism, greatly improved the mixing uniformity of solution in the groove, make phosphorite and sulfuric acid can be fully contacted reaction, and then accelerate the reaction speed, improve reaction rate, thereby enhanced the production efficiency and product quality of phosphoric acid and phosphorite gypsum in wet process phosphoric acid process.

Description

Technical Field

[0001] This utility model relates to wet phosphoric acid process equipment, specifically, to a disc-shaped aeration structure based on a reaction tank. Background Technology

[0002] The wet-process phosphoric acid production method primarily uses sulfuric acid to decompose phosphate rock, causing a reaction that produces phosphoric acid and calcium sulfate. Through acid hydrolysis, filtration, and purification processes, phosphoric acid is separated from impurities. This process is mature and can be scaled up for large-scale production, but it faces challenges such as the treatment of phosphogypsum waste and improving product purity. The treatment of phosphogypsum solid waste has long been a difficult problem in this field. Currently, researchers have improved the process so that the wet-process phosphoric acid production method can produce qualified phosphoric acid, as well as industrially compliant phosphogypsum byproducts and reusable auxiliary materials, fundamentally solving the problem of difficult traditional phosphogypsum solid waste treatment.

[0003] In the wet-process phosphoric acid production, the chemical reaction between phosphate rock and sulfuric acid must be carried out in a reaction tank with specific environmental conditions. As the core equipment, the design of the reaction tank has a decisive impact on production efficiency and product quality. Among these conditions, the uniformity of the reaction solution and the reaction rate are key factors affecting the production of phosphoric acid and phosphogypsum.

[0004] Traditional wet-process phosphoric acid production reactors typically employ a basic bottom structure design, such as a flat bottom or a shallow conical bottom. In the aeration stage, simple aeration devices are usually used, such as perforated aeration pipes or ordinary aeration heads. However, this conventional design presents numerous problems in actual production.

[0005] From the perspective of reaction liquid circulation, the basic bottom structure design makes it difficult for the aerated reaction liquid to form an ideal circulation path. The flat or shallow conical bottom design restricts the flow guidance of the liquid, making it difficult for the rising bubbles to effectively drive the liquid to achieve comprehensive and efficient circulation during aeration. Therefore, the reaction liquid in some areas of the reaction tank cannot be fully mixed with the new reactants in a timely manner, resulting in insufficient reaction and affecting the production efficiency of phosphoric acid and phosphogypsum. For example, in some large-scale wet-process phosphoric acid production plants, due to poor reaction liquid circulation, some reaction zones have excessive raw material residue, requiring increased reaction time to ensure sufficient reaction, which undoubtedly increases production costs.

[0006] Regarding the issue of uniform mixing of the solution within the tank, the basic aeration structure design is clearly insufficient to meet the requirement for thorough mixing of the reaction solution. The design of perforated aeration pipes or ordinary aeration heads is relatively simple, limiting the aeration range and resulting in uneven bubble distribution. At the edges of the reaction tank and in areas far from the aeration points, bubbles are scarce, and the liquid flow is sluggish, causing uneven reactant concentrations in these areas, creating a stark contrast with other areas. This uneven concentration not only slows down the reaction rate but also leads to instability in the quality of phosphoric acid and phosphogypsum products. For example, in product testing, fluctuations in the composition and quality of different batches of phosphoric acid and phosphogypsum are frequently observed, largely due to uneven mixing of the solution within the reaction tank.

[0007] From the perspective of reaction speed and effectiveness, the aforementioned problems of poor circulation and uneven mixing of the reaction solution directly affected the chemical reaction between the phosphate rock slurry and sulfuric acid. A slower reaction rate directly leads to longer production cycles, increased energy consumption, and decreased equipment efficiency. Furthermore, incomplete reaction may also increase impurities in the phosphogypsum product, affecting its subsequent application and thus failing to effectively solve the solid waste problem.

[0008] Although some manufacturers have attempted to improve the mixing and circulation of the reaction liquid by increasing the number of aeration devices or increasing the aeration intensity, the effectiveness of these measures is often limited. Too many aeration devices may occupy the effective space in the reaction tank, affecting the normal progress of the reaction; while simply increasing the aeration intensity may cause the liquid flow in the reaction tank to be too violent, resulting in energy waste, and may also cause some damage to the structure of the reaction tank.

[0009] In summary, traditional wet-process phosphoric acid production reactors have significant shortcomings in terms of internal structure and aeration design, making it difficult to meet the demands of modern, efficient, and high-quality production. Therefore, there is an urgent need for an innovative design that can optimize the circulation of the reaction solution and improve the mixing uniformity of the solution within the tank, thereby promoting faster and better processing of the wet-process phosphoric acid production reaction. Utility Model Content

[0010] To address the problems of the prior art, this invention provides a disc-shaped aeration structure based on a reaction tank. By optimizing the shape and structure of the bottom of the reaction tank, the circulation efficiency of the reaction liquid after aeration is improved, thereby enhancing the mixing uniformity of the solution in the tank and promoting faster and better reaction.

[0011] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0012] A disc-shaped aeration structure based on a reaction tank includes a reaction tank body, a disc-shaped channel arranged in a ring around the bottom of the reaction tank body, a central island formed by the inner ring portion of the disc-shaped channel protruding from the bottom of the reaction tank body, and an aeration mechanism disposed on the central island and connected to the outside through a pipe.

[0013] Specifically, the outlet of the aeration mechanism faces the inner edge of the disc-shaped trough, so that the mixed flow of aeration can efficiently enter the guide path of the disc-shaped trough.

[0014] Furthermore, the depth of the disc-shaped groove is matched to the installation height of the aeration mechanism, generally configured such that the depth of the disc-shaped groove is 0.5 to 2.5 times the installation height of the aeration mechanism. Preferably, the depth of the disc-shaped groove is twice the installation height of the aeration mechanism. This depth design effectively guides the mixed flow generated after aeration, forming a stable and efficient circulation path.

[0015] Meanwhile, the width of the dish-shaped trough opening is 60% to 95% of the inner radius of the reaction tank body, ensuring that the dish-shaped trough occupies a suitable area at the bottom of the reaction tank. It is neither too small to affect the circulation effect of the reaction liquid, nor too large to affect the layout and function of the central island and aeration mechanism.

[0016] Specifically, the aeration mechanism in this utility model is configured in two forms to cope with different actual working conditions, such as direct air supply aeration and pre-aeration followed by feeding:

[0017] Firstly, the aeration mechanism includes an aeration bracket installed at the bottom of the reaction tank body, an aeration distribution ring installed on the aeration bracket, and multiple aeration nozzles evenly distributed on the aeration distribution ring. The aeration distribution ring is connected to external air supply through a pipe pre-placed at the bottom of the reaction tank body.

[0018] The aeration nozzle is positioned downwards at the bottom of the aeration distribution ring.

[0019] Secondly, the aeration mechanism includes an aeration bracket installed at the bottom of the reaction tank body, an aeration distribution ring installed on the aeration bracket, and multiple aeration outlets evenly distributed on the aeration distribution ring. The aeration distribution ring is connected to the gas-containing material that has been pre-treated by over-aeration through a pipe pre-placed at the bottom of the reaction tank body.

[0020] The aeration outlet is located at the bottom of the aeration distribution ring and faces downwards.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) This utility model ingeniously utilizes the synergistic effect between the disc-shaped tank and the aeration mechanism. Through this unique structural design, the aerated reaction liquid forms a highly efficient circulating flow pattern under the guidance of the disc-shaped tank. Specifically, the liquid flowing upward from around the central island diffuses outward along the tank wall under the action of the disc-shaped tank. This diffusion not only ensures the uniform distribution of the liquid but also promotes the deep mixing of chemical substances in the liquid. Subsequently, the liquid flows downward along the reaction tank wall and eventually returns to the vicinity of the central island, thus completing a complete cycle. By applying the circulation pattern, the mixing uniformity of the solution in the tank is significantly improved, thereby ensuring sufficient contact and reaction between the phosphate rock slurry and sulfuric acid, thereby accelerating the entire chemical reaction process and significantly improving the production efficiency of phosphoric acid and phosphogypsum and the quality of the final product.

[0023] (2) The disc-shaped aeration structure of this utility model also has excellent energy-saving effect. Since the aeration nozzle or aeration outlet acts directly on the liquid at the bottom of the reaction tank, the gas utilization rate is greatly improved, reducing energy waste. At the same time, the design of the disc-shaped tank also optimizes the flow path of the mixed flow, further reducing energy consumption. This structural innovation not only significantly improves the reaction operation efficiency, but also perfectly matches the current green and environmentally friendly production concept, playing a positive role in promoting the sustainable development of this industry. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one embodiment of the present utility model.

[0025] Figure 2 This is another structural schematic diagram of an embodiment of the present utility model.

[0026] The components corresponding to the reference numerals in the attached drawings are:

[0027] 1-Reaction tank body, 2-Disc-shaped tank, 3-Central island, 4-Pipe, 10-Aeration mechanism, 11-Aeration support, 12-Aeration distribution ring, 13-Aeration nozzle, 14-Aeration outlet. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0029] Example

[0030] like Figures 1 to 2As shown, the disc-shaped aeration structure based on the reaction tank includes a reaction tank body 1, a disc-shaped trough 2 arranged in a ring around the bottom of the reaction tank body, a central island 3 formed by the inner ring portion of the disc-shaped trough protruding from the bottom of the reaction tank body, and an aeration mechanism 10 disposed on the central island and connected to the outside via a pipe 4. The outlet of the aeration mechanism 10 faces the inner edge of the disc-shaped trough 2. This structural design makes the aeration process inside the reaction tank more uniform and efficient, thereby optimizing the chemical reaction conditions in the entire phosphogypsum production process.

[0031] Specifically, the reaction tank body typically adopts a cylindrical structure, made of corrosion-resistant carbon steel lined with rubber or fiberglass to withstand the corrosive environment of sulfuric acid and other substances during wet-process phosphoric acid production. Its dimensions are determined by the production scale; for example, for large-scale production, the diameter of the reaction tank body is 5-10 meters, and the height is 6-10 meters. This design not only ensures the durability of the reaction tank but also provides sufficient space for large-scale production.

[0032] The disc-shaped trough is manufactured through a special process on the bottom of the reaction tank body. During the manufacturing process, based on the pre-designed dimensions, a disc-shaped structure is formed at the bottom of the reaction tank, arranged in a ring around the center, using either pre-machining or stacking filling methods. The depth of the disc-shaped trough is set according to the installation height of the aeration mechanism, which must also take into full account the overall spatial layout within the reaction tank. For example, if the installation height of the aeration mechanism is 0.5 meters, the depth of the disc-shaped trough is correspondingly set to 1 meter. The width of the trough opening is designed according to 60% to 95% of the internal radius of the reaction tank body. If the internal radius of the reaction tank body is 3 meters, then the width of the disc-shaped trough ranges from 1.8 to 2.85 meters, with the specific dimensions determined by the momentum calculation of the material inside the trough during the design phase. After manufacturing, the surface of the disc-shaped trough undergoes fine polishing and anti-corrosion treatment to ensure a smooth, flawless surface with excellent corrosion resistance, thereby reducing the flow resistance of the reaction liquid and effectively preventing corrosion.

[0033] The central island is formed by the inner ring of the disc-shaped trough protruding from the bottom of the reaction tank. The height of the central island is related to the depth of the disc-shaped trough, and its height should ensure that the aeration mechanism can be stably installed on it. The diameter of the central island is designed according to the size of the aeration mechanism, and is generally slightly larger than the diameter of the aeration distribution ring to ensure that there is enough space for gas distribution and liquid flow after the aeration mechanism is installed.

[0034] The aeration mechanism in this invention is configured in two forms to address different actual working conditions, such as direct aeration and pre-aeration followed by feeding:

[0035] Firstly, the aeration mechanism 10 includes an aeration bracket 11 installed at the bottom of the reaction tank body, an aeration distribution ring 12 installed on the aeration bracket, and a plurality of aeration nozzles 13 evenly distributed on the aeration distribution ring. The aeration distribution ring is connected to external air supply through a pipe pre-placed at the bottom of the reaction tank body.

[0036] Secondly, the aeration mechanism 10 includes an aeration support 11 installed at the bottom of the reaction tank body, an aeration distribution ring 12 installed on the aeration support, and a plurality of aeration outlets 14 evenly distributed on the aeration distribution ring. The aeration distribution ring is connected to the gas-containing material that has been pre-exposed by over-aeration through a pipe pre-placed at the bottom of the reaction tank body.

[0037] Specifically, the aeration nozzle 13 or aeration outlet 14 is arranged downwards at the bottom of the aeration distribution ring. This design allows the gas to act directly on the liquid or gas-containing material at the bottom of the reaction tank, promoting the upward flow of the liquid and thus driving the circulation and mixing of the liquid throughout the reaction tank, thereby improving the aeration efficiency.

[0038] The aeration support frame can be made of 316L stainless steel, which has excellent corrosion resistance. Depending on the shape and size of the central island, the support frame is fixed to the island via welding or bolting. The structural design of the aeration support frame must ensure sufficient strength and stability to withstand the weight of the aeration distribution ring and aeration nozzles, as well as the impact forces generated during aeration. For example, the aeration support frame can be designed as a multi-layered, cross-frame structure to enhance its stability.

[0039] The aeration distribution ring can also be made of 316L stainless steel, with its diameter designed according to the layout of the central island and aeration nozzles. The aeration distribution ring is connected to the external air supply pipeline via welding or flange connection and fixed to the aeration support. Multiple connection holes are evenly spaced on the aeration distribution ring for installing aeration nozzles or configuring aeration outlets. To ensure uniform gas distribution within the aeration distribution ring, a guide plate or flow equalization device can be installed inside the ring.

[0040] The aeration nozzles can be made of materials with good corrosion resistance and excellent aeration effect, such as ceramics or high-strength engineering plastics. Multiple aeration nozzles are evenly distributed at the bottom of the aeration distribution ring, facing downwards. The number of aeration nozzles depends on the size of the reaction tank and the aeration requirements, generally ranging from 10 to 30. Each aeration nozzle's outlet is configured with a specific shape and size to ensure that the gas is ejected at a suitable angle and speed, promoting thorough agitation and circulation of the liquid. For example, the outlet of the aeration nozzle may use a conical design to ensure that the gas forms a diffused bubble flow when ejected.

[0041] The aeration outlet can be directly and securely connected to the connection hole of the aeration distribution ring through the pipe structure, and is arranged in a manner similar to aeration nozzles, which is designed to adapt to external air-containing materials that have undergone pre-over-aeration treatment.

[0042] During installation, first, fix the reaction tank body on a suitable foundation, ensuring its levelness and verticality meet the requirements. Then, install the disc-shaped tank, central island, and aeration mechanism in sequence, ensuring that all components are securely connected and well-sealed. After installation, conduct comprehensive commissioning. After starting the external air supply system, carefully observe the aeration effect to ensure uniform bubble distribution and check whether the circulation of the reaction liquid in the disc-shaped tank is ideal. Adjust parameters such as the angle of the aeration nozzles / aeration outlets and the aeration intensity according to the actual situation to ensure that the aerated reaction liquid can form good circulation, improve the mixing uniformity of the solution in the tank, and promote the efficient production of wet-process phosphoric acid.

[0043] Through the above structural design, this utility model brings many significant benefits to the production of wet-process phosphoric acid.

[0044] I. Enhanced Reaction Liquid Circulation and Mixing: The coordinated operation of the disc-shaped tank and the aeration mechanism significantly optimizes the circulation path and mixing uniformity of the reaction liquid. The special shape of the disc-shaped tank effectively guides the flow of liquid generated by aeration, enabling the reaction liquid to form a stable and efficient circulation. Liquid flowing upwards from around the central island is diffused outwards along the tank wall by the disc-shaped tank, then flows downwards along the tank wall back to the vicinity of the central island, completing one cycle. This circulation mechanism ensures that the reaction liquid in all areas of the reaction tank fully participates in the circulation, effectively preventing localized stagnation of the reaction liquid. Simultaneously, the aeration nozzles are positioned downwards, directly acting on the liquid at the bottom of the reaction tank, promoting upward movement of the liquid and further enhancing the mixing effect. Rigorous testing has verified that, compared to traditional reaction tanks, this novel structural design significantly improves the mixing uniformity of the reaction system by 25%–35%, ensuring sufficient contact of reactants and a complete and thorough reaction.

[0045] II. Improved Reaction Rate and Production Efficiency: Due to the enhanced circulation and mixing uniformity of the reaction solution, the chemical reaction between phosphate rock slurry and sulfuric acid can proceed more rapidly and completely. A more uniform distribution of reactants allows the reaction to reach the desired level of reaction in a shorter time, thereby shortening the production cycle of the wet-process phosphoric acid production line.

[0046] III. Improved Product Quality: The excellent mixing uniformity of the reaction solution and the rapid reaction rate significantly improve the quality of phosphogypsum products. A more complete reaction means fewer impurities and greater stability in the product's composition. This results in more stable and reliable performance when phosphogypsum is subsequently used in building materials and other fields, enhancing the product's market competitiveness.

[0047] IV. Enhancing Equipment Stability and Reliability: To ensure efficient operation and long-term stability of the system, the aeration mechanism is securely mounted on the central island via an aeration bracket. Combined with the design of the disc-shaped trough and the reaction tank body, this not only guarantees high stability and reliability during system operation but also effectively disperses the impact force generated during the operation of the aeration mechanism, greatly reducing potential damage to the reaction tank body. Furthermore, the corrosion-resistant design of the disc-shaped trough and aeration mechanism significantly extends the overall service life of the equipment and substantially reduces maintenance costs.

[0048] In summary, the disc-shaped aeration structure based on the reaction tank of this invention has significant advantages in wet-process phosphoric acid production, effectively improving production efficiency, product quality, and equipment stability and reliability, bringing new technological breakthroughs to the wet-process phosphoric acid production industry.

[0049] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any changes made based on the design principles of this utility model, or any non-creative changes made on this basis, shall fall within the scope of protection of this utility model.

Claims

1. A disc-shaped aeration structure based on a reaction tank, characterized in that, It includes a reaction tank body (1), a disc-shaped trough (2) arranged in a ring around the bottom of the reaction tank body (1), a central island (3) formed by the inner ring of the disc-shaped trough (2) protruding at the bottom of the reaction tank body (1), and an aeration mechanism (10) connected to the outside via a pipe (4) on the central island (3).

2. The disc-shaped aeration structure based on a reaction tank according to claim 1, characterized in that, The outlet of the aeration mechanism (10) is oriented toward the inner edge of the disc-shaped groove (2).

3. The disc-shaped aeration structure based on a reaction tank according to claim 2, characterized in that, The depth of the disc-shaped groove (2) is 0.5 to 2.5 times the installation height of the aeration mechanism (10).

4. The disc-shaped aeration structure based on a reaction tank according to claim 3, characterized in that, The width of the groove (2) is 60% to 95% of the inner radius of the reaction tank body (1).

5. The disc-shaped aeration structure based on a reaction tank according to any one of claims 1 to 4, characterized in that, The aeration mechanism (10) includes an aeration bracket (11) installed at the bottom of the reaction tank body (1), an aeration distribution ring (12) installed on the aeration bracket (11), and a plurality of aeration nozzles (13) evenly distributed on the aeration distribution ring (12). The aeration distribution ring (12) is connected to external air supply through a pipe (4) pre-placed at the bottom of the reaction tank body (1).

6. The disc-shaped aeration structure based on a reaction tank according to claim 5, characterized in that, The aeration nozzle (13) is positioned downwards at the bottom of the aeration distribution ring (12).

7. The disc-shaped aeration structure based on a reaction tank according to any one of claims 1 to 4, characterized in that, The aeration mechanism (10) includes an aeration bracket (11) installed at the bottom of the reaction tank body (1), an aeration distribution ring (12) installed on the aeration bracket (11), and a plurality of aeration outlets (14) evenly distributed on the aeration distribution ring (12). The aeration distribution ring (12) is connected to the gas-containing material that has been pre-exposed to over-aeration through a pipe (4) pre-placed at the bottom of the reaction tank body (1).

8. The disc-shaped aeration structure based on a reaction tank according to claim 7, characterized in that, The aeration outlet (14) is positioned downwards at the bottom of the aeration distribution ring (12).

Images