Anti-crystallization device for processing extruded granular nitrogen fertilizer
By using the heating resistor wire and the heat transfer assembly of the fan during the nitrogen fertilizer processing, the crystallization and plate bonding problems of extruded particles are solved, and an efficient anti-crystallization effect is achieved.
Patent Information
- Application Number
- CN202422516428.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-17
AI Technical Summary
During the process of nitrogen fertilizer processing, crystallization and plate bonding are prone to occur after extrusion into particles, especially when the heat dissipation surface of the open-open cutting plate is larger, and the prior art cannot effectively solve the problem by adding anti-caking agent.
A heat resistance wire and fan are used to maintain the entire process of the lower hopper and extrusion box through hot air, and the rollers are used to extrude into particles and maintain the temperature during the entire granulation process to reduce the formation of plate latches when the particles are cold.
It effectively curbs the crystallization and plate formation of particles after extrusion, ensures that the particles retain heat throughout the process, and improves the production quality and efficiency of nitrogen fertilizers.
Smart Images
Figure CN223221446U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of nitrogen fertilizer processing equipment, and in particular relates to an anti-crystallization device for processing extruded granular nitrogen fertilizer. Background Art
[0002] During nitrogen fertilizer processing, the various raw materials specified in the process manual are mixed in an automated mixing tank and then poured into an extruder granulator to form granules. The mixture forms a paste after extrusion. During continuous extrusion, some granules adhere to each other and crystallize. Manufacturers' process instructions generally address this crystallization by adding an anti-caking agent to the mixture to improve the granules' flowability and anti-caking properties.
[0003] In order to improve the crystallization phenomenon of the product, the mixed material is also stirred at multiple levels before extrusion granulation to ensure uniform distribution of various components and reduce crystallization caused by excessive local concentration.
[0004] After adding the anti-caking agent to the nitrogen fertilizer mixture, it is evenly stirred and poured into the double-roll extrusion granulator for extrusion. However, the anti-caking agent cannot wrap the particles, and the surface of the extruded particles is relatively sticky, causing the extruded particles to partially compact when the discharge tray is cooled. In particular, the open discharge tray has a large heat dissipation surface, which is not conducive to curbing the crystallization of particles after extrusion. Utility Model Content
[0005] The utility model aims to provide an anti-crystallization device for processing extruded granular nitrogen fertilizer, which heats the granules and the mixed material at the same time and keeps the temperature during the entire extrusion granulation step, so as to prevent the crystallization of the granules after extrusion.
[0006] The technical solutions adopted by this utility model are as follows:
[0007] The invention discloses an anti-crystallization device for processing extruded granular nitrogen fertilizer, comprising an extrusion box and two pairs of rollers rotatably mounted inside the extrusion box, a heat transfer component being arranged on the extrusion box, a concave lower hopper and a fan being arranged in sequence from top to bottom below the extrusion box, an auxiliary heat chamber being provided inside the lower hopper and being connected to the output end of the fan, a heating resistance wire being fixed inside the auxiliary heat chamber and facing the fan, the heating resistance wire forming hot air by heating the air flow blown out by the fan, transferring heat to the lower hopper along the auxiliary heat chamber, and the exhaust gas flowing through the extrusion box along the heat transfer component During the pressing box and granulation, the reduction motor drives two pairs of rollers to rotate in opposite directions, and the pits on the surface of the rollers are used to squeeze the falling mixed materials into particles. The particles fall into the lower hopper and slide down the slope. At the same time, the heating resistor wire forms hot air through the air flow blown by the heating fan, and transfers the heat to the lower hopper along the auxiliary heating cavity. The exhaust gas flows through the extrusion box along the heat transfer component, and heats the particles in the lower hopper and the mixed materials in the extrusion box at the same time. The whole process of extrusion granulation is kept warm, which reduces the particles that are hardened due to cooling after extrusion, and facilitates the prevention of crystallization of particles after extrusion.
[0008] As a preferred solution, the heat transfer component includes an air guide cavity opened inside the extrusion box, and an air supply pipe is connected between the air guide cavity and the auxiliary heating cavity. The air supply pipe is used to transport the exhaust gas in the auxiliary heating cavity into the air guide cavity, so that the exhaust gas surrounds the two pairs of rollers, and the waste heat is transferred circumferentially to the extrusion box for heating the mixture, taking into account the heating and heat preservation of the mixture and the particles. In this way, only a single heating resistance wire is required to achieve heat preservation of the entire device.
[0009] As a preferred solution, thermal insulation cotton is fixed on both sides of the auxiliary heating chamber. The thermal insulation cotton can be made of polyurethane cotton to reduce heat loss on both sides, concentrate heat on the part of the lower hopper facing the particles, and absorb noise caused by airflow.
[0010] As a preferred solution, a plurality of spoilers are fixed in the middle interval of the auxiliary heating chamber. The spoilers are all in a folded shape with an oblique downward opening. The spoilers are all higher than the output end of the fan. After the hot air enters the auxiliary heating chamber, part of it contacts the spoiler, forming a vortex inside the spoiler, which is convenient for centralized heating of the particles on the lower hopper and can also delay the heating time.
[0011] As a preferred solution, inspection windows are embedded on both sides of the lower hopper. The inspection windows are made of transparent material to facilitate the staff's line of sight to observe whether the environment in the auxiliary heating chamber is blocked, so as to facilitate timely maintenance.
[0012] As a preferred solution, a filter element is fixed at the connection point between the fan output end and the auxiliary heating chamber, which can filter dust in the air flow blown by the fan and reduce the dust entering the auxiliary heating chamber, the air guide chamber and the air supply pipe.
[0013] As a preferred solution, an exhaust pipe connected to the air guide cavity is fixed on the outside of the extrusion box. After the exhaust heats the extrusion box, it is discharged along the exhaust pipe. The outlet end of the exhaust pipe can be connected to the air conditioning system for outdoor exhaust.
[0014] The technical effects achieved by this utility model are:
[0015] During granulation, the utility model drives two pairs of rollers to rotate in opposite directions through a reduction motor, utilizes the pits on the surfaces of the pairs of rollers to extrude the falling mixed materials into particles, and the particles fall into the lower hopper and slide down the inclined surface. At the same time, the heating resistance wire forms hot air through the air flow blown out by the heating fan, and transfers the heat to the lower hopper along the auxiliary heating cavity. The tail gas flows through the extrusion box along the heat transfer component, and heats the particles in the lower hopper and the mixed materials in the extrusion box at the same time. The whole process of the extrusion granulation step is kept warm, and the particles that are hardened due to being cooled after extrusion are reduced, which is convenient for curbing the crystallization of particles after extrusion.
[0016] The utility model uses an air supply pipe to transport the exhaust gas in the auxiliary heating chamber into the air guide chamber, so that the exhaust gas surrounds the two pairs of rollers, and the residual heat is transferred circumferentially to the extrusion box for heating the mixed material, taking into account the heating and heat preservation of the mixed material and the particles. In this way, only a single heating resistance wire is required to achieve heat preservation of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a front view of an anti-crystallization device for processing extruded granular nitrogen fertilizer according to the present invention;
[0018] Figure 2 It is a cross-sectional view of the lower hopper of the utility model;
[0019] Figure 3 This is a front view of the spoiler of the present invention;
[0020] Figure 4 It is a cross-sectional view of the squeeze box of the present utility model.
[0021] In the accompanying drawings, the components represented by the reference numerals are as follows:
[0022] 1. Extrusion box; 2. Pair of rollers; 3. Discharge hopper; 4. Fan; 5. Auxiliary heating chamber; 6. Heating resistor wire; 7. Air guide chamber; 8. Air supply pipe; 9. Insulation cotton; 10. Spoiler; 11. Inspection window; 12. Filter element; 13. Exhaust pipe. DETAILED DESCRIPTION
[0023] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.
[0024] like Figures 1-4 As shown, a device for preventing crystallization of extruded granular nitrogen fertilizer processing comprises an extrusion box 1 and two pairs of rollers 2 rotatably mounted inside the extrusion box 1, wherein one end of the two pairs of rollers 2 are connected by gear transmission, and the other end of one pair of rollers 2 is connected to the reduction motor through a gearbox transmission. A heat transfer component is provided on the extrusion box 1, and a lower hopper 3 and a fan 4 with a concave structure are provided below the extrusion box 1 from top to bottom. An auxiliary heating chamber 5 connected to the output end of the fan 4 is provided inside the lower hopper 3, and the auxiliary heating chamber 5 also has a concave structure. A heating resistance wire 6 facing the fan 4 is fixed inside the auxiliary heating chamber 5. The fan 4 can use a 2RB016H423 double-impeller high-pressure blower, especially for use in a larger space in the auxiliary heating chamber 5, and can continuously maintain a large air volume to fill the entire auxiliary heating chamber 5.
[0025] First, various raw materials are prepared according to the requirements of the process instruction manual, poured into a mixing tank and stirred until they are evenly mixed. Multiple mixing tanks can be set up, and the mixed materials are discharged alternately and transported to the extrusion box 1 by a material pump.
[0026] During granulation, the two rollers 2 are driven by a reduction motor to rotate in opposite directions. The pits on the surface of the rollers 2 are used to squeeze the falling mixed materials into granules. The granules fall into the lower hopper 3 and slide down the slope. At the same time, the heating resistor 6 forms hot air through the air flow blown by the heating fan 4, and transfers the heat to the lower hopper 3 along the auxiliary heating cavity 5. The exhaust gas flows through the extrusion box 1 along the heat transfer component, and heats the granules in the lower hopper 3 and the mixed materials in the extrusion box 1 at the same time. The whole process of extrusion granulation is kept warm, which reduces the hardening of granules caused by cooling after extrusion, and facilitates the prevention of crystallization of granules after extrusion.
[0027] Refer to the attached Figure 1 、 Figure 2 and Figure 4 The heat transfer component includes an air guide cavity 7 opened inside the extrusion box 1. An air supply pipe 8 is connected between the air guide cavity 7 and the auxiliary heating cavity 5. The air supply pipe 8 is used to transport the exhaust gas in the auxiliary heating cavity 5 into the air guide cavity 7, so that the exhaust gas surrounds the two pairs of rollers 2 and transfers the residual heat in a circumferential direction to the extrusion box 1 for heating the mixed material, taking into account the heating and heat preservation of the mixed material and the particles. In this way, only a single heating resistance wire 6 is required to achieve heat preservation of the entire device.
[0028] Refer to the attached Figure 1 and Figure 2 Insulation cotton 9 is fixed on both sides of the auxiliary heat chamber 5. The insulation cotton 9 can be made of polyurethane cotton to reduce heat loss on both sides, concentrate the heat on the part of the lower hopper 3 aimed at the particles, and absorb the noise caused by the airflow.
[0029] Refer to the attached Figure 2 and Figure 3 A plurality of spoilers 10 are fixed in the middle interval of the auxiliary heating chamber 5. The spoilers 10 are all in a folded shape with an oblique downward opening. The spoilers 10 are all higher than the output end of the fan 4. After the hot air enters the auxiliary heating chamber 5, part of it contacts the spoiler 10, and a vortex is formed inside the spoiler 10, which is convenient for centralized heating of the particles on the lower hopper 3 and can also delay the heating time.
[0030] Refer to the attached Figure 1 and Figure 2 Inspection windows 11 are embedded on both sides of the lower hopper 3. The inspection windows 11 are made of transparent material. In this embodiment, they are preferably made of insulating glass, which is convenient for the staff to see through and observe whether the environment in the auxiliary heating chamber 5 is blocked, so as to ensure timely maintenance.
[0031] Refer to the attached Figure 1 and Figure 2A filter element 12 is fixed at the connection point between the output end of the fan 4 and the auxiliary heating chamber 5. The filter element 12 can be made of honeycomb activated carbon material, which is light and can filter dust in the air flow blown by the fan 4, reducing the dust entering the auxiliary heating chamber 5, the air guide chamber 7 and the air supply pipe 8.
[0032] Refer to the attached Figure 1 and Figure 4 A tail gas pipe 13 connected to the air guide cavity 7 is fixed to the outside of the extrusion box 1. After the exhaust heats the extrusion box 1, it is discharged along the tail gas pipe 13. The outlet end of the tail gas pipe 13 can be connected to the air conditioning system for outdoor exhaust.
[0033] The working principle of the utility model is as follows: when working, various raw materials are first prepared, poured into a mixing tank for stirring until they are evenly mixed, and then transported to the extrusion box 1 by a material pump.
[0034] During granulation, the two rollers 2 are driven by a reduction motor to rotate in opposite directions. The pits on the surface of the rollers 2 are used to squeeze the falling mixed materials into granules. The granules fall into the lower hopper 3 and slide down the slope. At the same time, the heating resistor 6 forms hot air through the air flow blown by the heating fan 4, and transfers the heat to the lower hopper 3 along the auxiliary heating cavity 5. The exhaust gas flows through the extrusion box 1 along the heat transfer component, and heats the granules in the lower hopper 3 and the mixed materials in the extrusion box 1 at the same time. The whole process of extrusion granulation is kept warm, which reduces the hardening of granules caused by cooling after extrusion, and facilitates the prevention of crystallization of granules after extrusion.
[0035] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications should be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.
Claims
1. An anti-crystallization device for processing extruded granular nitrogen fertilizer, comprising an extrusion box (1) and two pairs of rollers (2) rotatably mounted inside the extrusion box (1), characterized in that: The extrusion box (1) is provided with a heat transfer component. A concave lower hopper (3) and a fan (4) are sequentially provided below the extrusion box (1) from top to bottom. An auxiliary heating chamber (5) connected to the output end of the fan (4) is provided inside the lower hopper (3). A heating resistor (6) facing the fan (4) is fixed inside the auxiliary heating chamber (5). The heating resistor (6) forms hot air through the airflow blown out by the heating fan (4), and transfers heat to the lower hopper (3) along the auxiliary heating chamber (5). The exhaust gas flows through the extrusion box (1) along the heat transfer component.
2. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 1, characterized in that: The heat transfer component comprises an air guide cavity (7) provided inside the extrusion box (1), and an air supply pipe (8) is connected between the air guide cavity (7) and the auxiliary heat cavity (5).
3. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 1, characterized in that: Thermal insulation cotton (9) is fixed on both sides of the auxiliary heating chamber (5).
4. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 1, characterized in that: A plurality of spoilers (10) are fixed at intervals in the middle of the auxiliary heat chamber (5), and the spoilers (10) are all in a folded shape with an oblique downward opening.
5. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 1, characterized in that: Inspection windows (11) are embedded and installed on both sides of the lower hopper (3), and the inspection windows (11) are made of transparent material.
6. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 1, characterized in that: A filter core (12) is fixed at the connection point between the output end of the fan (4) and the auxiliary heat chamber (5).
7. The device for preventing crystallization of extruded granular nitrogen fertilizer according to claim 2, characterized in that: A tail gas pipe (13) communicating with the air guide cavity (7) is fixed on the outside of the extrusion box (1).