Reaction tank with inclined guide plate

Abstract

The invention discloses a reaction tank with inclined guide plates, which comprises a reaction tank body, a plurality of downward-turning guide plates and upward-pressing guide plates, the downward-turning guide plates and the upward-pressing guide plates are obliquely arranged on the inner wall of the reaction tank body, and the downward-turning guide plates are spirally arranged on the upper position of the inner wall of the reaction tank body. The plurality of upward-pressing type guide plates are spirally arranged at the lower position of the inner wall of the reaction tank body, the spiral arrangement directions of the downward-turning type guide plates and the upward-pressing type guide plates are opposite, a gap is kept between the downward-turning type guide plates and the inner wall, and the spiral arrangement direction of the downward-turning type guide plates and the rotation direction of paddles arranged in the reaction tank body form an incidence angle; and the spiral arrangement direction of the upper pressing type guide plate and the rotation direction of the paddle arranged in the reaction tank body form the same angle. Through the unique design of the guide plates, the problems that a traditional reaction tank is uneven in material mixing, poor in liquid flowing, unreasonable in heat distribution and the like are solved, the reaction efficiency and the product quality of phosphoric acid and phosphogypsum production are effectively improved, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to wet-process phosphoric acid process equipment, and more specifically, to a reaction tank with an inclined deflector plate. Background Art

[0002] The wet-process phosphoric acid process mainly uses sulfuric acid to decompose phosphate rock, causing a reaction to produce phosphoric acid and calcium sulfate. Through processes such as acidolysis, filtration, and purification, the separation of phosphoric acid from impurities is achieved. This process is mature and has a large production scale, but there are problems such as the treatment of phosphogypsum waste residue and the improvement of product purity. The treatment of phosphogypsum solid waste has been a persistent problem in this field. Currently, researchers have improved the process so that the wet-process phosphoric acid process can not only produce qualified phosphoric acid but also produce phosphogypsum by-products that meet industrial standards and reusable auxiliary materials, fundamentally solving the problem of traditional phosphogypsum solid waste treatment.

[0003] In the production process of wet-process phosphoric acid, the reaction tank plays a core role and is a key equipment for the entire process. The reaction tank is equipped with an efficient stirring device inside. Through precise stirring actions, the phosphate ore slurry and sulfuric acid can be fully and evenly mixed. This efficient mixing not only accelerates the reaction process and improves the reaction efficiency but also ensures the thoroughness of the reaction, which has a decisive impact on the yield and quality of phosphoric acid and the quality of phosphogypsum.

[0004] However, the currently used reaction tanks still have many problems. First, the stirring effect is not ideal. Especially in large reaction tanks, the uniformity of material mixing is significantly insufficient. In the areas near the tank wall and far from the stirrer, the reaction degree shows significant differences. This leads to an abnormally high sulfuric acid concentration in some areas and local accumulation of phosphate ore slurry. These problems not only reduce the yield and quality of phosphoric acid but also make the quality of phosphogypsum unstable and the impurity distribution uneven. Second, the liquid flow state in the tank is not good. After the reaction is completed, the separation of phosphoric acid and phosphogypsum slurry becomes difficult. There are so-called dead zones in the liquid flow, resulting in the retention of some phosphogypsum slurry. This not only reduces production efficiency but also causes the separation interface to be blurred due to fluid flow disorder, further increasing the load on subsequent separation equipment and seriously affecting the separation effect and the quality of the final product. Third, since this reaction is an exothermic reaction, the heat distribution in the reaction tank is uneven. In the areas where the reaction is intense, the temperature is relatively high, while in the areas far from the reaction zone, the temperature is relatively low. This temperature difference not only affects the reaction rate and degree, thus affecting the production quality of wet-process phosphoric acid products, but also the uneven temperature may cause local deformation, cracking, etc. of the equipment, thereby shortening the service life of the equipment. In addition, the existing reaction tanks lack flexibility in dealing with changes in different production scales and raw material characteristics. Facing adjustments in production scale or changes in phosphate ore quality, the reaction conditions in the reaction tank are often difficult to quickly and effectively adapt, leading to production instability and significant fluctuations in product quality.

[0005] In summary, the current wet-process phosphoric acid production reactor has many defects in key aspects such as material mixing efficiency, liquid flow characteristics, heat transfer effect and production adaptability, which have seriously affected production efficiency and product quality. Therefore, it is urgent to improve the reactor in order to solve the above problems and improve the overall performance of wet-process phosphoric acid production. Summary of the invention

[0006] In view of the above problems of the prior art, the present invention provides a reaction tank with an inclined guide plate. The guide plate with an upward pressing and downward turning structure design can effectively solve the problems of uneven material mixing and unsatisfactory liquid flow in the reaction tank.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A reaction tank with inclined guide plates, comprising a reaction tank body, a plurality of downward-turning guide plates and upward-pressure guide plates inclinedly arranged on the inner wall of the reaction tank body, a plurality of downward-turning guide plates being arranged in a spiral shape at the upper position of the inner wall of the reaction tank body, a plurality of upward-pressure guide plates being arranged in a spiral shape at the lower position of the inner wall of the reaction tank body, the spiral arrangement directions of the downward-turning guide plates and the upward-pressure guide plates being opposite, the spiral arrangement direction of the downward-turning guide plates being at an angle of attack to the rotation direction of the blades arranged in the reaction tank body, and the spiral arrangement direction of the upward-pressure guide plates being at the same angle to the rotation direction of the blades arranged in the reaction tank body; when the material in the reaction tank body is stirred, the downward-turning guide plates and the upward-pressure guide plates cause the material flow field to form multiple eddies and turbulences, continuously changing the flow pattern, and promoting material mixing and reaction. This reverse spiral arrangement mode enables the liquid to form a more complex and reasonable flow path in the tank under the action of the stirring device. The upper liquid is turned downward by the downward-turning guide plate, and the lower liquid is pressed upward by the upward-pressing guide plate. When the two meet, they can mix the materials more fully, greatly improving the uniformity of material mixing, avoiding local accumulation, and thereby improving the phosphoric acid yield and phosphogypsum quality.

[0008] Furthermore, the downward-turning guide plate and the upward-pressing guide plate are intermittently connected to the inner wall of the reaction tank body through a plurality of connecting rods, so that a gap is maintained between the inner edge of the guide plate and the inner wall of the reaction tank body. This gap design has two advantages: first, it allows the liquid to flow between the guide plate and the tank wall, increasing turbulence under energy-saving conditions and further improving the mixing effect; second, it can reduce the resistance of the guide plate to the flow of the liquid to a certain extent, thereby improving the liquid circulation efficiency.

[0009] Furthermore, the slope inclination angle between the head and tail ends of the downward-turning deflector and the upward-pressing deflector is 15 degrees to 60 degrees, preferably 45 degrees. Such an angle setting helps to guide the liquid to flow in a specific direction, strengthen the interaction between liquids, and promote material mixing.

[0010] Furthermore, the downward-turning deflector inclines 0 degrees to 30 degrees, preferably 15 degrees, from the vertical direction relative to the inner wall towards the angle of attack direction. The upward-pressing deflector inclines 0 degrees to 30 degrees, preferably 15 degrees, from the vertical direction relative to the inner wall towards the same angle direction. This inclination angle can effectively control the downward-turning and upward-pressing forces of the liquid, enabling the liquid to form an ideal circulating flow in the tank and better meeting the production requirements.

[0011] Furthermore, four downward-turning deflectors are configured. The projection of each downward-turning deflector along the axis direction of the reaction tank body has a length approximately equal to one-fourth of the circumference of the reaction tank body, and there are tiny gaps between the projections. The number and length of the upward-pressing deflectors are the same as those of the downward-turning deflectors. This design of the number and length can not only ensure the effective guidance of the liquid in the tank but also not overly occupy the space in the tank, ensuring the normal operation of the stirring device and the smoothness of the liquid flow.

[0012] Furthermore, a plurality of through holes are evenly arranged on the downward-turning deflector and the upward-pressing deflector, and the hole opening rate is 10% to 40%, preferably 35%. The design of the through holes enables the liquid to freely penetrate on both sides of the deflector, which not only enhances the liquid mixing effect but also effectively reduces the weight of the deflector, decreases the pressure on the inner wall of the reaction tank, and thus extends the service life of the equipment.

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention significantly improves the liquid stirring efficiency in the edge part of the tank. In a traditional reaction tank, due to insufficient stirring in the edge area, material accumulation often occurs. The inclined deflector adopted in the present invention effectively changes the liquid flow path through its unique upward-pressing and downward-turning structure. Specifically, the upward-inclined deflector can guide the liquid at the bottom of the tank to flow upward, while the downward-inclined deflector guides the liquid at the upper part to flow downward, enabling the liquid in the edge area to fully exchange with the liquid in the central area. This change in liquid flow greatly improves the stirring efficiency of the liquid in the edge part, making the material mixing more uniform. Uniform mixing effectively curbs the local accumulation phenomenon, promotes the full mixing reaction of the phosphate ore pulp and sulfuric acid, thereby improving the reaction efficiency, output, and quality of phosphoric acid, ensuring the stability of the phosphogypsum quality, and effectively reducing the impurity content.

[0014] (2) The present invention has a positive effect on heat transfer. Through the reasonably arranged flow guiding plates, the liquid flow becomes more orderly and uniform, accelerating the heat transfer and diffusion speed in the reaction tank, effectively improving the problem of uneven heat distribution caused by reaction heat release, and avoiding the adverse effects of local heat imbalance on the reaction process and product quality. In addition, the good heat transfer performance also helps to improve the energy utilization efficiency, reduce energy waste, and further enhance the economy and sustainability of the production process.

[0015] (3) The present invention has good production adaptability. In the face of different production scale requirements and changes in raw material characteristics, parameters such as the tilt angle, quantity, and distribution of the flow guiding plates can be flexibly adjusted. This enables the reaction tank to quickly adapt to changes in production conditions, maintain a stable and efficient production state, enhance the flexibility and controllability of the production process, and provide strong support for enterprises to respond to market changes and diverse production demands. This adaptability ensures the continuity and stability of the production process. Even in the case of fluctuations in raw material supply or changes in production demand, it can ensure product quality and production efficiency, thereby enhancing the market competitiveness of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the unfolded inner wall of the reaction tank in an embodiment of the present invention.

[0017] Figure 2 It is another schematic structural diagram of the unfolded inner wall of the reaction tank in an embodiment of the present invention.

[0018] Figure 3 It is still another schematic structural diagram of the unfolded inner wall of the reaction tank in an embodiment of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the inclined arrangement of the downward-turning flow guiding plate in an embodiment of the present invention, corresponding to Figure 1 the B-B cross-section of area A in

[0020] Figure 5 It is a schematic structural diagram of the inclined arrangement of the upward-pressing flow guiding plate in an embodiment of the present invention.

[0021] Figure 6 It is a schematic structural diagram of the connection structure of a downward-turning flow guiding plate in an embodiment of the present invention.

[0022] Figure 7 It is a schematic structural diagram of the top view of the reaction tank in an embodiment of the present invention.

[0023] Among them, the component names corresponding to the reference numerals are: 1 - reaction tank body, 2 - downward-turning flow guiding plate, 3 - upward-pressing flow guiding plate, 4 - through hole, 5 - connecting rod member. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The implementation manners of the present invention include but are not limited to the following embodiments. Embodiment

[0025] As Figures 1 to 7 shown, the reaction tank with an inclined deflector includes a reaction tank body 1, a plurality of downward-turning deflectors 2 and upward-pressing deflectors 3 that are inclined and arranged on the inner wall of the reaction tank body. The plurality of downward-turning deflectors are arranged in a spiral shape at a position closer to the upper part of the inner wall of the reaction tank body, and the plurality of upward-pressing deflectors are arranged in a spiral shape at a position closer to the lower part of the inner wall of the reaction tank body. The spiral arrangement directions of the downward-turning deflectors and the upward-pressing deflectors are opposite. The spiral arrangement direction of the downward-turning deflector forms an angle of attack with the rotation direction of the impeller configured in the reaction tank body, and the spiral arrangement direction of the upward-pressing deflector forms the same angle with the rotation direction of the impeller configured in the reaction tank body; when the materials in the reaction tank body are stirred, the downward-turning deflectors and the upward-pressing deflectors cause the material flow field to form multiple vortices and turbulences, continuously converting the flow pattern, and promoting the mixing and reaction of the materials. This design not only improves the efficiency of the reaction tank, but also makes the flow of the liquid in the reaction tank more orderly through the spiral arrangement, thereby enhancing the turbulence intensity and efficiency of the reaction process.

[0026] Its detailed structure and working process are as follows: The reaction tank body usually adopts a cylindrical tank structure, and the material is selected from materials with good corrosion resistance, such as rubber-lined carbon steel or fiberglass, etc., to adapt to the strongly corrosive environment of the reaction between phosphate rock and sulfuric acid. For example, carbon steel is widely used in acid treatment equipment, and fiberglass is also often used to manufacture corrosion-resistant chemical equipment because of its low density, high mechanical strength, and good corrosion resistance. This ensures the stability and durability of the reaction tank in extreme environments.

[0027] The production materials of the downward-turning deflectors and the upward-pressing deflectors can be selected from corrosion-resistant materials that match the reaction tank body, such as 1.4462 stainless steel. This material has excellent corrosion resistance in most environments due to its high chromium, molybdenum, and nitrogen content, and even shows strong pitting and crevice corrosion resistance in oxidizing and acidic solutions. The slope inclination angle between the head and the tail of each downward-turning deflector and upward-pressing deflector is configured to be 15 degrees to 60 degrees, preferably 45 degrees, represented by a in the figure; the downward-turning deflector is inclined 0 to 30 degrees, preferably 15 degrees, in the direction of the angle of attack relative to the vertical direction of the inner wall, represented by b in the figure; the upward-pressing deflector is inclined 0 to 30 degrees, preferably 15 degrees, in the direction of the same angle relative to the vertical direction of the inner wall, represented by c in the figure. This ensures that the deflectors can exhibit the best performance in the reaction tank.

[0028] The downward-turning deflector and the upward-pressing deflector are intermittently and pointwise connected to the inner wall of the reaction tank body through the connecting rod member 5. The connecting rod member is also made of corrosion-resistant material. During the processing, one end of multiple connecting rod members is welded or bolted to one side of the deflector first, and then the other end of the connecting rod member is welded and fixed according to the positions pre-marked on the inner wall of the reaction tank to form a stable connection, thereby also forming a gap between the inner edge of the deflector and the inner wall of the reaction tank. The size of this gap is adjusted according to factors such as actual production requirements and liquid flow rate, generally controlled between 1 and 15 centimeters. This connection method greatly enhances the stability and operation reliability of the deflector in the reaction tank.

[0029] Four downward-turning deflectors are arranged in a spiral shape at the upper position on the inner wall of the reaction tank body. A gap of about 2 centimeters is reserved between the projections of adjacent downward-turning deflectors in the axial direction of the reaction tank body. The projection length of each downward-turning deflector in the axial direction of the reaction tank body is about 1 / 4 of the circumference of the reaction tank body. Similarly, four upward-pressing deflectors are arranged in a spiral shape at the lower position on the inner wall of the reaction tank body, with the spiral arrangement direction opposite to that of the downward-turning deflectors, and their projection lengths and gap settings are the same as those of the downward-turning deflectors. This spiral arrangement method further optimizes the liquid flow in the reaction tank and improves the reaction efficiency.

[0030] A plurality of through holes 4 are evenly arranged on the deflector. Laser drilling technology can be used to ensure the hole opening accuracy and uniformity, so that the hole opening rate can be controlled between 10% and 40%, and can be adjusted to about the preferred 35%. These through holes not only increase the disturbance of the liquid, but also further strengthen the mixing effect through the mutual penetration of the through holes on the deflector.

[0031] When the phosphate ore pulp and sulfuric acid enter the tank from the top feed port of the reaction tank, the stirring device starts to work, driving the liquid to form a circular motion. The downward-turning deflector turns the upper-layer liquid downward along a spiral track. Due to the action of its inclination angle and the inclination angle of the head and tail, the liquid continuously mixes with the surrounding materials during the downward flow. At the same time, the upward-pressing deflector presses the lower-layer liquid upward along the opposite spiral track, intersecting with the downward-turned liquid in the middle area of the tank to form a high-strength cross-flow, realizing the full mixing of the materials. This design significantly improves the mixing efficiency and ensures the full reaction of the phosphate ore pulp and sulfuric acid.

[0032] During the liquid flow process, part of the liquid flows through the gap between the deflector and the tank wall, increasing the liquid disturbance. At the same time, the liquid penetrates each other through the through holes on the deflector, further strengthening the mixing effect. As the reaction progresses, the generated heat is also evenly distributed in the reaction tank along with the circulating flow of the liquid. This design not only improves the mixing efficiency, but also ensures the even distribution of heat through the even flow of the liquid, thereby improving the stability and efficiency of the reaction.

[0033] During the operation of the equipment, it is necessary to regularly check the stability of the deflector and the connecting rod members, confirm that the through holes of the deflector are unobstructed, and that the gap between the deflector and the tank wall is uniform. If any problems are found, maintenance and adjustment should be carried out in a timely manner to ensure that the reaction tank is always in an efficient operating state, avoiding production interruptions caused by equipment failures.

[0034] The innovative improvement of the structure of the reaction tank in the present invention brings extremely significant beneficial effects in many aspects.

[0035] In terms of material mixing, by adopting the reverse spiral arrangement and the uniquely designed tilting angle of the downward-turning and upward-pressing deflectors, the mixing uniformity of the materials in the reaction tank body is significantly improved. The problem of material accumulation in the edge area of the traditional reaction tank is fundamentally solved, and the phosphate ore slurry and sulfuric acid can fully contact and mix to react. Through actual production verification, compared with the traditional reaction tank, the phosphoric acid yield can be significantly increased by 10% - 30%. At the same time, the uniform mixing of the materials greatly improves the quality of phosphogypsum, effectively reducing the impurity content, laying a solid foundation for the subsequent application of phosphogypsum in high-quality building materials, chemical raw materials and other fields.

[0036] From the perspective of liquid flow, the gap between the deflector and the tank wall and the through hole design on the deflector effectively increase the disturbance and penetration of the liquid. A more efficient and reasonable cross-flow and jet entrainment high-intensity turbulent field circulation is formed in the tank, and the flow dead zone is almost completely eliminated. This enables the reaction products to be quickly carried out to participate in the subsequent separation process, and the production efficiency is greatly improved. According to statistics, after using the reaction tank of the present invention, the production efficiency can be increased by 20% - 40%, greatly shortening the production cycle and reducing the production cost.

[0037] Regarding the heat distribution problem, the full mixing and circulating flow of the liquid enable the heat generated by the reaction to be evenly diffused in the reaction tank. The negative impact of uneven heat distribution on the reaction rate and degree is avoided, ensuring the stability and consistency of the reaction process, and further improving the stability of product quality. Moreover, due to the uniform temperature distribution, the problem of local damage of the reaction tank equipment caused by temperature stress is significantly improved, and the service life of the equipment is significantly extended.

[0038] In addition, during the implementation process, the solution of this embodiment does not require large-scale transformation of the overall structure of the reaction tank and the stirring device, and has good economic efficiency and feasibility. With relatively simple structural adjustment, the reaction extraction link in wet-process phosphoric acid production is comprehensively optimized, significantly improving the economic efficiency and production efficiency of the enterprise, and further enhancing the competitiveness of the enterprise in the market.

[0039] The above embodiments are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention. Any changes made by adopting the design principle of the present invention and non-creative labor on this basis shall fall within the protection scope of the present invention.

Claims

1. A reaction tank with an inclined deflector, characterized in that, It includes a reaction tank body (1), a plurality of downward-turning guide plates (2) and upward-pressing guide plates (3) that are inclined and arranged on the inner wall of the reaction tank body (1). The plurality of downward-turning guide plates are arranged in a spiral shape at a position closer to the upper part of the inner wall of the reaction tank body (1), and the plurality of upward-pressing guide plates are arranged in a spiral shape at a position closer to the lower part of the inner wall of the reaction tank body (1). The spiral arrangement directions of the downward-turning guide plates (2) and the upward-pressing guide plates (3) are opposite. The spiral arrangement direction of the downward-turning guide plate (2) forms an attack angle with the rotation direction of the impeller configured in the reaction tank body (1), and the spiral arrangement direction of the upward-pressing guide plate (3) forms the same angle with the rotation direction of the impeller configured in the reaction tank body (1); when the materials in the reaction tank body are stirred, the downward-turning guide plates (2) and the upward-pressing guide plates (3) cause the material flow field to form multiple vortices and turbulences, continuously convert the flow pattern, and promote the mixing and reaction of the materials.

2. The reaction tank with an inclined deflector according to claim 1, characterized in that, The downward-turning guide plates (2) and the upward-pressing guide plates (3) are intermittently and pointwise connected to the inner wall of the reaction tank body (1) through a plurality of connecting members, so that a gap is maintained between the inner edge of the guide plate and the inner wall of the reaction tank body (1).

3. The reaction tank with an inclined deflector according to claim 2, characterized in that, The slope inclination angle between the head and the tail ends of the downward-turning guide plates (2) and the upward-pressing guide plates (3) is 15 degrees to 60 degrees.

4. The reaction tank with an inclined deflector according to claim 3, characterized in that, The downward-turning guide plate (2) is inclined 0 degrees to 30 degrees in the attack angle direction relative to the vertical direction of the inner wall.

5. The reaction tank with an inclined deflector according to claim 4, characterized in that, The upward-pressing guide plate (3) is inclined 0 degrees to 30 degrees in the same angle direction relative to the vertical direction of the inner wall.

6. The reaction tank with an inclined deflector according to claim 5, characterized in that, Four downward-turning guide plates (2) are configured, and the projection length of each downward-turning guide plate in the axial direction of the reaction tank body is 1 / 4 of the circumference of the reaction tank body, and a certain gap is maintained between their projections; the number and length of the upward-pressing guide plates (3) are the same as those of the downward-turning guide plates.

7. The reaction tank with an inclined deflector according to any one of claims 1 to 6, characterized in that, A plurality of through holes (4) are evenly opened on the downward-turning guide plates (2) and the upward-pressing guide plates (3), and the opening ratio is 10% to 40%.

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