Spray head for AKD (Alkyl Ketene Dimer) granulation

Abstract

A spray head for AKD granulation comprises a spray head barrel, a spray head fixing flange facilitating installation and connection of the spray head barrel and an external AKD solution supply pipeline is fixedly installed at the end of one end of the spray head barrel, a sealing supporting plate is fixedly installed at the end of the other end of the spray head barrel, and a plurality of holes are formed in the sealing supporting plate. A spiral nozzle for spraying an AKD solution is fixedly mounted in each hole, each spiral nozzle is of a conical structure with a large inlet and a small outlet, and a spiral spraying channel is arranged in the spiral nozzle from the inlet to the outlet; the thickness of the sealing supporting plate is consistent with the length of the spiral nozzle, and the shape of the hole is consistent with that of the spiral nozzle. Due to the design of the spiral nozzle, the AKD granulator not only ensures that AKD fluid flows in smoothly and is sprayed out at a high speed, but also can realize good atomization, and is favorable for ensuring the granulation quality of AKD.

Description

Technical Field

[0001] This utility model relates to the field of AKD production technology, and in particular to a nozzle for AKD granulation. Background Technology

[0002] Alkyl ketone dimer (AKD) is an unsaturated lactone that can be used as an alkaline sizing agent in papermaking. It is mainly used as an internal sizing agent for paper types such as coated paper, copy paper, archival paper, dictionary paper, and high-quality writing paper. The sizing pH value can reach about 8.0, and it is widely used both domestically and internationally.

[0003] Currently, there are two main processes for synthesizing AKD:

[0004] One method is a solvent-based process, with the main raw materials being triethylamine, fatty acid acyl chloride, and toluene, where toluene is the solvent. In the synthesis reaction, due to the presence of the solvent toluene, the material has good flowability and low viscosity, and a stirring reaction mode is generally adopted in a kettle.

[0005] Another method is the solvent-free process, with triethylamine and fatty acid acyl chloride as the main raw materials. In the solvent-free synthesis of the papermaking additive AKD, the material viscosity is high in the later stages of the reaction, and it contains fine triethylamine hydrochloride solid particles. At temperature T=65℃, the material viscosity can reach 130,000 mPa·s. After the reaction is complete, the triethylamine hydrochloride solid particles in the AKD product need to be dissolved in a solution to achieve stratification of AKD in the triethylamine hydrochloride aqueous solution, thus obtaining a high-purity AKD product.

[0006] In existing technologies, solvent-free processes are generally used for AKD synthesis. However, during the powder spraying process, ordinary nozzles may result in uneven material dispersion, leading to inconsistent particle size and irregular shape. This affects the powder's flowability, solubility, and other physical properties, and also causes differences in product quality between different batches. Furthermore, due to the less-than-ideal particle distribution from ordinary nozzles, some particles may adhere to each other and agglomerate, forming large particle clusters that affect the product's performance and subsequent processing. In addition, ordinary nozzles typically require high temperature and pressure conditions, consuming a large amount of energy and increasing energy costs in the production process. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a nozzle for AKD granulation that, through the design of a spiral nozzle, ensures both smooth inflow and high-speed ejection of AKD fluid, as well as good atomization, thereby helping to guarantee the quality of AKD granulation.

[0008] The technical problem to be solved by this utility model is achieved through the following technical solution. This utility model is a nozzle for AKD granulation, including a nozzle body. A nozzle fixing flange is fixedly installed at one end of the nozzle body to facilitate the installation and connection of the nozzle body with an external AKD solution supply pipeline. A sealing support plate is fixedly installed at the other end of the nozzle body. Several holes are provided on the sealing support plate. A spiral nozzle for spraying AKD solution is fixedly installed in each hole. The spiral nozzle has a conical structure with a large inlet and a small outlet. A spiral spray channel is provided in the spiral nozzle from the inlet to the outlet.

[0009] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the nozzle used for AKD granulation described above, the thickness of the sealing support plate is consistent with the length of the spiral nozzle, and the shape of the hole is consistent with the shape of the spiral nozzle.

[0010] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the nozzle used for AKD granulation described above, the generatrix inclination angle of the spiral nozzle is 75°-85°.

[0011] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the nozzle for AKD granulation described above, the number of spiral turns of the spray channel is 5-7 turns.

[0012] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the nozzle for AKD granulation described above, one side of the nozzle fixing flange is fixedly connected to the nozzle cylinder, and the other side of the nozzle fixing flange is provided with a nozzle connection sealing surface for cooperating with an external AKD solution supply pipeline.

[0013] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: For the nozzle used for AKD granulation described above, a concave structure is also provided on the nozzle fixing flange at the nozzle connection sealing surface.

[0014] The technical problem to be solved by this utility model can also be further achieved through the following technical solution: for the nozzle for AKD granulation described above, the nozzle cylinder is a conical cylinder structure.

[0015] Compared with existing technologies, the application of this application in the solvent-free production process of AKD (a papermaking additive) finished products alters the fluid's trajectory through a spiral structure, transforming straight-line flow into spiral flow. This provides a new mechanism for atomization, differing from traditional straight-through nozzles that rely solely on pressure for atomization. The combination of a large inlet and small outlet structure with a spiral channel ensures both smooth fluid inflow and high-speed ejection, while also achieving excellent atomization through the spiral structure. The streamlined spiral structure design from the inlet to the outlet of the spiral nozzle used in the production of AKD finished products results in a low resistance coefficient and minimal energy loss during internal AKD flow, achieving good spraying effects with low energy consumption. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a bottom view of the structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the spiral nozzle of this utility model;

[0019] Figure 4 This is a top view of the spiral nozzle of this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Reference Figure 1-4 A nozzle for AKD granulation, specifically designed for AKD (alkyl ketene dimer) granulation processes, features a compact and efficient structure. It aims to optimize the spraying effect of the AKD solution, improving granulation quality and efficiency. Specifically:

[0022] The nozzle includes a nozzle body 2, which has a conical cylindrical structure. This not only enhances the structural strength of the cylinder but also facilitates the smooth flow of the solution within the cylinder, reducing flow resistance. A nozzle fixing flange 3 is fixedly installed at the large end of the nozzle body 2 to facilitate the connection between the nozzle body 2 and the external AKD solution supply pipeline. A sealing support plate is fixedly installed at the small end of the nozzle body 2. Several holes are provided on the sealing support plate to form a natural fluid guide, enabling the AKD solution to flow more efficiently to the spray point.

[0023] The nozzle mounting flange 3 is used for quick and stable installation connection with the external AKD solution supply pipeline. One side of the nozzle mounting flange 3 is fixedly connected to the nozzle body 2, and the other side of the nozzle mounting flange 3 is provided with a nozzle connection sealing surface 4 for cooperating with the external AKD solution supply pipeline. The nozzle connection sealing surface 4 is machined with high precision to ensure the sealing performance between it and the supply pipeline and prevent solution leakage. The nozzle mounting flange 3 at the nozzle connection sealing surface 4 is also provided with a concave structure. This design can further increase the contact area of ​​the sealing surface, improve the sealing effect, and ensure that stable sealing performance can be maintained under harsh conditions such as high pressure and high temperature.

[0024] A spiral nozzle 1 for spraying AKD solution is fixedly installed in each hole. The thickness of the sealing support plate is the same as the length of the spiral nozzle 1 to ensure the stability of the spiral nozzle 1 installation. The shape of the hole is the same as the shape of the spiral nozzle 1, which can provide precise positioning for the installation of the spiral nozzle 1.

[0025] The spiral nozzle 1 has a conical structure with a large inlet and a small outlet. A spiral spray channel 5 is provided inside the spiral nozzle 1 from the inlet to the outlet. This design results in a low resistance coefficient for the AKD solution flowing within the spray channel 5, reducing clogging and energy loss. It achieves a good spray effect with low energy consumption, thus facilitating the accelerated flow of the AKD solution within the spiral nozzle 1 and increasing the spray speed. Preferably, the number of spiral turns in the spray channel 5 is 5-7. This design guides the solution to flow in a spiral manner, increasing the turbulence and improving the spray effect. The generatrix inclination angle of the spiral nozzle 1 is 75°-85°. This angle range has been carefully calculated to ensure that the solution is sprayed out at the optimal angle and speed, achieving a highly efficient granulation effect.

[0026] The working principle of this application is as follows: AKD solution enters the nozzle cylinder 2 from the external supply pipeline through the nozzle fixing flange 3, and flows to the spiral nozzle 1 on the sealing support plate under the guidance of the conical cylinder. After being accelerated and turbulent by the spiral channel in the spiral nozzle 1, the AKD solution is sprayed into the granulation area at high speed and uniformly, which not only ensures its smooth inflow and high-speed spray, but also achieves good atomization to form an ideal granular AKD product.

[0027] The usage process of a nozzle for AKD granulation is as follows:

[0028] I. Preparation Stage

[0029] Connect the nozzle body to the external AKD solution supply pipeline through the nozzle fixing flange, ensuring a tight connection and good sealing.

[0030] Check whether the spiral nozzle on the sealing support plate is securely installed and whether the hole and nozzle shape are perfectly matched.

[0031] Ensure all connections are secure and leak-free;

[0032] Check the concave structure on the nozzle mounting flange for integrity to enhance the sealing effect;

[0033] The nozzle body is confirmed to have a conical cylindrical structure, which helps the solution flow smoothly;

[0034] Prepare AKD solution:

[0035] Ensure the quality of the AKD solution meets the granulation requirements;

[0036] The solution is injected into the external supply pipe in preparation for spraying.

[0037] II. Spraying Phase

[0038] Open the valve on the external supply pipeline to allow the AKD solution to flow into the nozzle body;

[0039] The AKD solution flows inside the nozzle barrel and, guided by the conical structure, flows toward the spiral nozzle on the sealing support plate.

[0040] After the solution enters the spiral nozzle, it accelerates its flow within the spiral jet channel, generating turbulence.

[0041] The spiral nozzle sprays the solution into the granulation area at high speed and uniformly;

[0042] During the spraying process, continuously monitor the spraying effect, such as spraying speed, angle, and uniformity;

[0043] Adjust the flow rate, pressure and other parameters of the external supply pipeline as needed to ensure the best spraying effect;

[0044] III. Granulation Stage

[0045] The sprayed AKD solution comes into contact with air or other media in the granulation area, gradually dries and forms granular products;

[0046] The size, shape and other characteristics of the particles are affected by a variety of factors such as spray speed, angle and solution concentration.

[0047] Collected AKD particles;

[0048] The collected particles are screened, graded, and processed to obtain a final product that meets the requirements.

[0049] IV. Conclusion

[0050] After the granulation process is completed, close the valve of the external supply pipeline to stop the solution from flowing into the nozzle body;

[0051] Clean the nozzles with a cleaning agent to remove residual AKD solution and impurities.

[0052] In summary, the nozzle for AKD granulation provided in this application has a compact and efficient structure, which can ensure uniform spraying and efficient granulation of AKD solution. At the same time, its unique conical cylinder, high-precision sealing surface, and optimized spiral nozzle design give the nozzle significant advantages in the AKD granulation process.

Claims

1. A nozzle for AKD prilling, characterized by: The device includes a nozzle body, with a nozzle fixing flange fixedly installed at one end of the nozzle body to facilitate the installation and connection of the nozzle body with an external AKD solution supply pipeline. A sealing support plate is fixedly installed at the other end of the nozzle body. Several holes are provided on the sealing support plate, and a spiral nozzle for spraying AKD solution is fixedly installed in each hole. The spiral nozzle has a conical structure with a large inlet and a small outlet, and a spiral spray channel is provided in the spiral nozzle from the inlet to the outlet.

2. The nozzle for AKD prilling according to claim 1, characterized in that: The thickness of the sealing support plate is the same as the length of the spiral nozzle, and the shape of the hole is the same as the shape of the spiral nozzle.

3. The nozzle for AKD prilling according to claim 1 or 2, characterized in that: The inclination angle of the generatrix of the spiral nozzle is 75°-85°.

4. The nozzle for AKD prilling according to claim 1 or 2, characterized in that: The number of spiral turns in the injection channel is 5-7.

5. The nozzle for AKD prilling according to claim 1, characterized in that: One side of the nozzle fixing flange is fixedly connected to the nozzle cylinder, and the other side of the nozzle fixing flange is provided with a nozzle connection sealing surface for cooperating with an external AKD solution supply pipeline.

6. The nozzle for AKD prilling according to claim 5, characterized in that: A concave structure is also provided on the nozzle fixing flange at the nozzle connection sealing surface.

7. The nozzle for AKD prilling according to claim 1, characterized in that: The nozzle body has a conical cylindrical structure.

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