Chemical raw material anti-caking treatment device and chemical raw material conveying system

Abstract

The utility model discloses a kind of chemical raw material anti-caking treatment device and chemical raw material conveying system, it belongs to anti-caking processing field, chemical raw material anti-caking treatment device includes mixing tank, feeding assembly and stirring assembly, feeding assembly includes feeding piece and oil injection part, the feeding piece is used to convey material in the mixing tank, the oil injection part is used to spray oil material to the material in the mixing tank.Stirring assembly is built in the mixing tank, it is used to stir the material and oil material in the mixing tank, to make material and oil material intermixing.The chemical raw material anti-caking treatment device provided in the utility model imports material into mixing tank by feeding piece, and oil material is sprayed to the material in mixing tank by oil injection part.Subsequently, the material in mixing tank is constantly stirred using stirring assembly, make material and oil material evenly mixed, so that material particle surface is wrapped oil film, so material can be avoided to be gathered, so that the storage time of material can be extended.

Description

Technical Field

[0001] This utility model relates to the field of anti-caking treatment, specifically to a chemical raw material anti-caking treatment device and a chemical raw material conveying system. Background Technology

[0002] Diammonium phosphate (DAP) is an important phosphorus chemical product with a wide range of applications. In agriculture, it is mainly used as a high-efficiency phosphorus-potassium compound fertilizer, which has significant effects on increasing yield and income. With the development of fertigation, water-soluble fertilizers have developed rapidly and have become one of the main directions of fertilizer development.

[0003] Existing diammonium phosphate production systems can be found in patent application number CN202210419576.6, which involves introducing ammonia gas into phosphoric acid to obtain an ammonium phosphate slurry, followed by separating ammonium phosphate from the slurry and drying it. However, ammonium phosphate particles are prone to clumping during transportation and storage, causing inconvenience for subsequent fertilization operations.

[0004] Therefore, how to prevent the agglomeration of chemical raw material particles is an urgent technical problem to be solved. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a chemical raw material anti-caking treatment device to solve the technical problem of easy agglomeration of chemical raw material particles in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: On the one hand, this utility model provides a chemical raw material anti-caking treatment device, which includes: Mixing tank; The feeding assembly includes a feeding component and an oil spraying component, wherein the feeding component is used to convey materials into the mixing tank, and the oil spraying component is used to spray oil onto the materials in the mixing tank. A stirring assembly, which is built into the mixing tank, is used to stir the materials and oils in the mixing tank so that the materials and oils are mixed together.

[0007] In some embodiments, the fuel spraying component includes a fuel supply section and a fuel spray gun, one end of the fuel spray gun extends into the mixing tank, and the fuel supply section communicates with the other end of the fuel spray gun and supplies fuel to the fuel spray gun so that the fuel spray gun sprays fuel in the mixing tank.

[0008] In some embodiments, the oil supply unit includes an oil tank, a delivery pump, and a jet pipe. The oil tank stores oil, the delivery pump is connected to one end of the jet pipe, and the delivery pump is used to pressurize water vapor to one end of the jet pipe. The other end of the jet pipe is connected to the mixing tank, and the jet pipe is connected to the oil tank.

[0009] In some embodiments, the inner diameter of the connection between the jet pipe and the oil drum is narrowed.

[0010] In some embodiments, the feeding assembly further includes a controller electrically connected to the feeding element and the delivery pump, respectively, to control the feeding element and the delivery pump to proportionally feed materials and oil.

[0011] In some embodiments, the fuel injector is horizontally positioned and has a plurality of injection holes arranged horizontally.

[0012] In some embodiments, the mixing assembly includes a screw and a motor, the screw being rotatably built into the mixing tank, and the motor being drively connected to the screw to drive the screw to rotate.

[0013] In some embodiments, the mixing tank has a feeding port on top and a discharge port at the bottom, and the mixing tank also has a baffle that is closable and installed at the discharge port.

[0014] In some embodiments, the feeding device includes a metering belt conveyor, the discharge end of which overlaps with the feeding port to convey material into the feeding port via the metering belt conveyor.

[0015] On the other hand, this utility model also provides a chemical raw material conveying system, including the above-mentioned chemical raw material anti-caking treatment device and a discharge belt conveyor. The starting end of the discharge belt conveyor is connected to the discharge end of the mixing tank, receiving and conveying the material discharged from the mixing tank.

[0016] First, the material is fed into the mixing tank via the feeding component, and then the oil is sprayed onto the material in the mixing tank via the oil spraying component. Subsequently, the mixing component continuously stirs the material in the mixing tank, ensuring that the material and oil are evenly mixed, so that the surface of the material is coated with an oil film, thereby preventing the material from clumping and extending the storage time of the material. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the chemical raw material anti-caking treatment device provided in this embodiment of the utility model; Explanation of reference numerals in the attached drawings: mixing tank 100, feeding port 110, discharging port 120, baffle 130, feeding assembly 200, feeding component 210, metering belt conveyor 211, oil spraying component 220, oil supply unit 221, oil tank 2211, conveying pump 2212, jet pipe 2213, stirring blade 2214, oil spraying gun 222, spraying hole 2221, controller 230, stirring assembly 300, screw 310, motor 320, discharging belt conveyor 400. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] To address the technical problem of easy agglomeration of chemical raw material particles, this utility model provides a chemical raw material anti-agglomeration treatment device, which can prevent the material surface from being coated with an oil film and thus prevent the material from clumping together.

[0020] It should be noted that the chemical raw material anti-caking treatment device of this utility model is used in the production of diammonium phosphate. For ease of explanation, this utility model only uses the application of the chemical raw material anti-caking treatment device in the production of diammonium phosphate as an example for explanation. The principle of the chemical raw material anti-caking treatment device applied to other chemical raw materials that are prone to caking is essentially the same, and will not be described in detail here.

[0021] It should be emphasized that the material in this application can be diammonium phosphate granules or other chemical raw material granules that are prone to absorbing water and clumping.

[0022] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a chemical raw material anti-caking treatment device according to an embodiment of the present invention. The chemical raw material anti-caking treatment device includes a mixing tank 100, a feeding assembly 200, and a stirring assembly 300. The feeding assembly 200 includes a feeding component 210 and an oil spraying component 220. The feeding component 210 is used to convey materials into the mixing tank 100, and the oil spraying component 220 is used to spray oil onto the materials in the mixing tank 100. The stirring assembly 300 is built into the mixing tank 100 and is used to stir the materials and oil in the mixing tank 100 to mix the materials and oil together.

[0023] In this embodiment, the material is first introduced into the mixing tank 100 through the feeding component 210, and the oil is sprayed onto the material in the mixing tank 100 through the oil spraying component 220. Then, the mixing component 300 continuously stirs the material in the mixing tank 100 to make the material and oil evenly mixed, so that the surface of the material particles is coated with an oil film, thereby preventing the material from clumping and extending the storage time of the material.

[0024] The original intention of this application's technical solution was to solve the problem of diammonium phosphate's tendency to clump. To enable those skilled in the art to better understand the technical solution of this application, a brief introduction to the mainstream theories of diammonium phosphate clumping is provided: The capillary adsorption theory posits that after diammonium phosphate absorbs moisture, a thin film forms on its crystal surface, accelerating capillary adsorption. This creates a meniscus-shaped liquid surface, driving ions towards the particle contact points, leading to cross-linking and adhesion between adjacent particles, resulting in product agglomeration. Because diammonium phosphate components possess a certain degree of hygroscopicity, their critical relative humidity is lower than that of a single component salt (i.e., increased hygroscopicity), which exacerbates the agglomeration tendency. When its critical relative humidity is lower than the air humidity, it absorbs moisture from the air, forming a saturated solution film on the surface of the diammonium phosphate particles. Due to surface tension, a concave liquid surface forms between the surface-contacting particles, causing ions in the saturated solution to move towards the particle contact points, resulting in cross-linking and adhesion between adjacent particles into clumps.

[0025] Assume the particles are spheres with radius R (m), and the contact surfaces between the particles are annular with radius r (m). According to Laplace's formula, the adhesive force f (N) applied to hold the particles together is: F=2·Π·r2·σ / R In the formula, σ represents surface tension, in N / m. This force is independent of vapor pressure and depends on particle size and the contact area between particles. Therefore, increasing particle size and decreasing the contact area between particles helps to reduce the adhesion force between particles.

[0026] The crystal bridging theory suggests that the ions on the surface of diammonium phosphate particles undergo repeated dissociation, dissolution, and recrystallization. Due to the phase equilibrium effect, the particles connect at the contact points, resulting in agglomeration.

[0027] When diammonium phosphate particles absorb moisture from the air, or when moisture inside the particles diffuses to the surface, a solution film forms on the particle surface. The concentration of this solution depends on the temperature. Temperature fluctuations cause the dissolution and crystallization processes to alternate. The solubility of the diammonium phosphate component increases with increasing temperature. When the ambient temperature decreases, the solution film between the particles becomes a supersaturated solution, and crystals precipitate. Alternatively, when the moisture absorbed by the particles evaporates or is absorbed by other dry particles, this solution film also becomes a supersaturated solution, and new crystals are formed. Over time, these crystals combine to form crystal bridges, binding the diammonium phosphate particles together and gradually forming large clumps. The strength of the crystal bridges depends on the shape, thickness, and equiaxedness of the newly formed crystals.

[0028] Because phosphate (PO43+) is a trivalent anion, it easily reacts with ions such as NH4+, K+, Ca2+, Mg2+, and H+ in compound fertilizers to form various compound salts. Accompanied by the exothermic reaction and the release of water, it causes a recrystallization process between the particle surfaces, forming crystal bridges and leading to the clumping of diammonium phosphate.

[0029] The theory of plastic deformation posits that agglomeration is accompanied by deformation, which is exacerbated by pressure. Residual heat in incompletely cooled diammonium phosphate (DAP) transfers from the particle center outwards. If the DAP particles are compressed during this process, deformation occurs, leading to agglomeration. During storage, excessive pressure results in greater plastic deformation of the DAP particles, increasing the contact area between particles, decreasing the distance between grains, and increasing molecular attraction. This creates favorable conditions for reaction and recrystallization, making DAP readily agglomerate.

[0030] Oils are typically formulated using a combination of surfactants and base oils. The main advantage lies in the surfactant's unique hydrophilic and lipophilic structure, which creates a hydrophobic film on the particle surface. This reduces the interfacial tension and contact angle between the solid and liquid phases, improving the crystallization habit of diammonium phosphate. Within the crystal, it interferes with intermolecular forces, altering the crystal morphology of diammonium phosphate, thereby weakening crystallization strength and binding force, and lowering the surface energy of the crystal. This significantly reduces the product's hygroscopicity, achieving the goal of preventing caking. Taking a commonly used surfactant—fatty amines—as an example, it is an effective anti-caking agent. Under certain conditions, the R(CH2)nNH3+ cation of fatty amines undergoes ion exchange with the NH4+ and Mg2+ in the compound fertilizer's complex salt structure, leading to changes in crystal properties. Crystals without anti-caking agents exhibit a rod-like structure, easily agglomerating and bridging to form hard lumps. However, with the addition of fatty amines, the crystals become villous, and the crystal bridges become fragile, easily disintegrating upon contact, thus achieving a good anti-caking effect.

[0031] The above explanation is merely a theoretical basis for the causes of material agglomeration and how to use oil to solve the agglomeration problem. The technical solution of this application is based on the above theory in equipment design and application.

[0032] In some embodiments, the oil spraying component 220 includes an oil supply section 221 and an oil spray gun 222. One end of the oil spray gun 222 extends into the mixing tank 100, and the oil supply section 221 connects to the other end of the oil spray gun 222 and supplies oil to the oil spray gun 222, so that the oil spray gun 222 sprays oil into the mixing tank 100. The oil supply section 221 connects to the oil spray gun 222, thereby pressurizing the oil to the oil spray gun 222. Since the oil spray gun 222 extends into the mixing tank 100, the oil spray gun 222 sprays the oil in the form of small droplets throughout the mixing tank 100, so that the sprayed oil can fully contact the material, thereby accelerating the homogenization of the material and oil, and thus shortening the working time of the mixing assembly 300.

[0033] Any implementation of the fuel supply unit 221 that can supply fuel to the fuel injector 222 is feasible. For example, the fuel can be directly pumped into the fuel injector 222 using an oil pump.

[0034] In some other embodiments, the oil supply unit 221 includes an oil tank 2211, a delivery pump 2212, and a jet pipe 2213. The oil tank 2211 stores oil. The delivery pump 2212 is connected to one end of the jet pipe 2213 and is used to pressurize water vapor to one end of the jet pipe 2213. The other end of the water vapor is connected to the mixing tank 100, and the middle part of the jet pipe 2213 is connected to the oil tank 2211. The delivery pump 2212 pressurizes water vapor to one end of the jet pipe 2213, causing a high-speed water vapor flow to form inside the jet pipe 2213. Due to Bernoulli's principle, the high-speed water vapor flow creates a negative pressure, which draws in the oil stored in the oil tank 2211, causing the oil to enter the jet pipe 2213. Under the impact of the high-speed water vapor flow, the oil is transformed into fine oil droplets and mixes with the water vapor. The high-speed water vapor flow, carrying the oil droplets, is sprayed into the material in the mixing tank 100 through the spray gun 222.

[0035] On the one hand, the high-speed flow of water vapor can transform oil into fine oil droplets, which then quickly and fully contact the material under the entrainment of the high-speed water vapor flow. On the other hand, some oil surfactants need to adsorb a certain amount of water before they can exert their effects. The process of the high-speed water vapor flow carrying the oil allows the surfactants to come into contact with water, thereby activating their effects.

[0036] Based on the above embodiments, in some embodiments, the inner diameter of the connection between the jet pipe 2213 and the oil drum 2211 is narrowed. Because the inner diameter of the connection between the jet pipe 2213 and the oil drum 2211 is narrowed, the airflow velocity at the connection between the jet pipe 2213 and the oil drum 2211 can be increased, thereby allowing for a stronger negative pressure at the connection between the jet pipe 2213 and the oil drum 2211.

[0037] In some embodiments, the oil supply unit 221 further includes an agitator blade 2214, which is rotatably built into the jet pipe 2213 and located at one end of the jet pipe 2213 near the oil injection gun 222. The high-speed flowing water vapor can drive the agitator blade 2214 to rotate. On the one hand, the rotating agitator blade 2214 can disperse the oil droplets more finely, and on the other hand, it can make the oil droplets evenly distributed in the water vapor flow.

[0038] In some embodiments, the feeding assembly 200 further includes a controller 230, which is electrically connected to the feeding component 210 and the delivery pump 2212 respectively, to control the feeding component 210 and the delivery pump 2212 to deliver materials and oil in a proportional manner.

[0039] It is understandable that materials and oils need to be mixed in a specific ratio. If the oil ratio is too low, the materials will not be adequately coated and protected by the oil film. If the oil ratio is too high, it will result in oil waste. In the above embodiment, the controller 230 controls the feeding device 210 and the delivery pump 2212 to deliver materials and oils in a proportional manner, thereby ensuring that the materials and oils can be mixed in a fixed ratio.

[0040] In some embodiments, the mixing tank 100 has a feeding port 110 at its top and a discharge port 120 at its bottom. The mixing tank 100 also has a baffle 130, which is closable and installed at the discharge port 120. Materials and oils are introduced into the mixing tank 100 through the feeding port 110. During the mixing process, the baffle 130 can be used to close the feeding port 110 to prevent material from overflowing. After the mixing of materials and oils is complete, the baffle 130 can be opened to allow the material to be discharged through the feeding port 110.

[0041] In some embodiments, the feeding unit 210 includes a metering belt conveyor 211, the discharge end of which overlaps with the feeding port 110 to convey material into the feeding port. After the finished product is screened, semi-finished material particles are obtained. The initial section of the metering belt conveyor 211 receives the material, and the discharge end of the metering belt conveyor 211 overlaps with the feeding port 110, thereby allowing the material to be introduced into the mixing tank 100 via the metering belt conveyor 211.

[0042] It should be emphasized that the metering belt conveyor 211 is a widely used material conveying equipment. It can measure the flow rate of the material it conveys and can feed back the flow rate of the material it conveys to the controller 230 in the form of an electrical signal.

[0043] In some embodiments, the controller 230 is a DCS control module. The material flow signal obtained by the metering belt conveyor 211 is fed back to the DCS control module, which then adjusts the flow rate of the steam gas delivered by the conveying pump 2212 according to the set addition ratio and frequency model, thereby controlling the flow rate of the oil. The oil spray gun 222 sprays fine oil droplets onto the surface of the material so that the mixing assembly 300 can quickly mix the material and oil together.

[0044] In some embodiments, the fuel injector 222 is horizontally positioned and has a plurality of injection holes 2221 arranged horizontally. Fuel is sprayed out through each injection hole 2221, thereby expanding the spray range of the fuel.

[0045] Any implementation of the stirring assembly 300 capable of agitating the materials within the mixing tank 100 is feasible. In some embodiments, the stirring assembly 300 includes a screw 310 and a motor 320. The screw 310 is rotatably integrated into the mixing tank 100, and the motor 320 is connected to the screw 310 to drive its rotation. The motor 320 drives the screw 310 to rotate, which in turn agitates the materials within the mixing tank 100, causing the materials and oil to mix and come into full contact. This results in an oil film coating the surface of the materials, preventing clumping.

[0046] Furthermore, this utility model also provides a chemical raw material conveying system, including the aforementioned chemical raw material anti-caking treatment device and a discharge belt conveyor 400. The starting end of the discharge belt conveyor 400 is connected to the discharge end of the mixing tank 100, receiving and conveying the material discharged from the mixing tank 100. Specifically, the discharge belt conveyor 400 receives and conveys the material discharged from the discharge port 120. The discharge belt conveyor 400 is located below the discharge port 120, and by receiving the material discharged from the discharge port 120, the material can be conveyed to subsequent processing equipment.

[0047] To better understand this utility model, the following is combined with... Figure 1 The technical solution of this utility model is described in detail below: The initial section of the metering belt conveyor 211 receives the material, and the discharge end of the metering belt conveyor 211 connects to the feeding port 110, allowing the material to be introduced into the mixing tank 100. The conveying pump 2212 pressurizes steam to one end of the jet pipe 2213, creating a high-speed steam flow within the jet pipe 2213. The negative pressure generated by this high-speed steam flow draws in the oil stored in the oil tank 2211. The oil spray gun 222 extends into the mixing tank 100, and the oil supply unit 221 supplies oil to the oil spray gun 222, enabling it to spray oil into the mixing tank 100. The motor 320 drives the screw 310 to rotate, which agitates the material in the mixing tank 100, causing the material and oil to mix and come into full contact. This results in an oil film coating the material surface, preventing clumping and extending the material's shelf life.

[0048] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A device for preventing caking of chemical raw materials, characterized in that, include: Mixing tank; The feeding assembly includes a feeding component and an oil spraying component, wherein the feeding component is used to convey materials into the mixing tank, and the oil spraying component is used to spray oil onto the materials in the mixing tank. The oil spraying component includes an oil supply section and an oil spray gun. One end of the oil spray gun extends into the mixing tank. The oil supply section connects to the other end of the oil spray gun and supplies oil to the oil spray gun, so that the oil spray gun sprays oil in the mixing tank. The oil supply unit includes an oil drum, a delivery pump, and a jet pipe. The oil drum stores oil. The delivery pump is connected to one end of the jet pipe and is used to pressurize water vapor to one end of the jet pipe. The other end of the jet pipe is connected to the mixing tank, and the jet pipe is connected to the oil drum. The inner diameter of the jet pipe narrows at the connection point with the oil drum; A stirring assembly, which is built into the mixing tank, is used to stir the materials and oils in the mixing tank so that the materials and oils are mixed together.

2. The chemical raw material anti-caking treatment device according to claim 1, characterized in that, The feeding assembly also includes a controller, which is electrically connected to the feeding component and the conveying pump respectively, to control the feeding component and the conveying pump to feed materials and oil in a proportional manner.

3. The chemical raw material anti-caking treatment device according to claim 1, characterized in that, The fuel injector is horizontally positioned and has several injection holes arranged horizontally.

4. The chemical raw material anti-caking treatment device according to claim 3, characterized in that, The mixing assembly includes a screw and a motor. The screw is rotatably built into the mixing tank, and the motor is connected to the screw to drive the screw to rotate.

5. The chemical raw material anti-caking treatment device according to claim 1, characterized in that, The mixing tank has a feeding port on the top and a discharge port at the bottom. The mixing tank also has a baffle that can be opened and closed at the discharge port.

6. The chemical raw material anti-caking treatment device according to claim 5, characterized in that, The feeding device includes a metering belt conveyor, the discharge end of which overlaps with the feeding port to convey material into the feeding port.

7. A chemical raw material conveying system, characterized in that, The device includes a chemical raw material anti-caking treatment device and a discharge belt conveyor as described in any one of claims 1 to 6, wherein the starting end of the discharge belt conveyor is connected to the discharge end of the mixing tank, and receives and transports the material discharged from the mixing tank.

Images