A dryer for fertilizer production

Abstract

The utility model discloses a dryer for fertilizer production, including drying cylinder, receiving box and feed barrel, the bottom of drying cylinder is provided with the bottom plate through the support column, and the inside of bottom plate is provided with receiving box, and the bottom end of drying cylinder inside is provided with heating rod, and the both sides of drying cylinder are evenly provided with microwave heater, and the outside of drying cylinder still is provided with the heat preservation shell cover. The utility model discloses a drying cylinder both sides even setting microwave heater and bottom end setting heating rod, combine the design of heat preservation shell cover, realized the composite heating mode of multistage heat source. This design not only improved the heating efficiency, also made the heat distribution more uniform. In addition, adopt multistage heat recovery system, and the waste gas waste heat produced in the drying process is recycled through circulating pump and back gas pipe and is used again, significantly increases the hot -blast circulation path, further improves the thermal efficiency, and reduces the energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of fertilizer production technology, specifically a dryer for fertilizer production. Background Technology

[0002] In the modern fertilizer production industry, dryers are key equipment, playing a crucial role in ensuring fertilizer quality and production efficiency. However, traditional fertilizer production dryers have many shortcomings in practical applications, failing to meet the current industry demands for efficient, energy-saving, environmentally friendly, and high-quality production. From a heating perspective, traditional dryers mostly use a single heating source, such as relying solely on electric heating or combustion heating. This single heating method easily leads to uneven heat distribution, causing localized overheating or insufficient drying of the material during the drying process. For example, in some dryers using electric heating, fertilizer near the heating element may be over-dried, while parts farther away may be under-dried, affecting the overall quality and stability of the fertilizer. Simultaneously, single heating methods have low thermal efficiency and high energy consumption, increasing production costs. Regarding energy utilization, traditional dryers often lack effective heat recovery and hot air circulation systems. During the drying process, a large amount of heat is discharged with the exhaust gas without being fully recovered and utilized, resulting in significant energy waste. Utility Model Content

[0003] The purpose of this invention is to provide a dryer for fertilizer production to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a drying cylinder for fertilizer production, comprising a drying cylinder, a receiving box, and a feeding hopper. A bottom plate is provided below the drying cylinder via a support column, and a receiving box is provided inside the bottom plate. A heating rod is provided at the bottom of the drying cylinder, and microwave heaters are evenly arranged on both sides of the drying cylinder. An insulation outer shell is also provided on the outside of the drying cylinder. A servo motor is installed at one end of the drying cylinder, and the output end of the servo motor extends into the interior of the drying cylinder and is equipped with a spiral feeding slurry. A cavity is provided at the other end of the drying cylinder, and an activated carbon filter element is installed inside the cavity. A circulation pump is also installed at the top of the drying cylinder, and the input pipe of the circulation pump extends into the interior of the cavity. A return air pipe is provided at the output end of the circulation pump, and a distribution pipe is provided at the output end of the return air pipe. Return air pipes are evenly arranged at the bottom of the distribution pipes, and the output end of the return air pipes evenly extends to the top of the interior of the drying cylinder. A feed hopper is installed on the outside of the feed inlet at the top of the drying cylinder. The outside of the discharge outlet at the bottom of the drying cylinder is connected to the receiving box via a discharge pipe. An exhaust box is installed on the outside of the opening at the top of the receiving box. An exhaust fan is installed inside the exhaust box. A return pipe is installed on the top of the exhaust box and connected to the preheating coil on the outside of the feed hopper.

[0005] Preferably, an air outlet is provided between the cavity and the drying cylinder, and a metal filter screen is provided inside the air outlet.

[0006] Preferably, the heating rod has a built-in temperature sensing element, and the bottom of the drying cylinder is provided with a groove structure for accommodating the heating rod.

[0007] Preferably, the drying cylinder has windows on both sides for installing microwave heaters.

[0008] Preferably, a heat-conducting plate is provided on the side wall of the feed hopper inside the preheating coil.

[0009] Preferably, the preheating coil includes a heat exchange inner tube that is attached to the heat-conducting plate and an insulation sleeve disposed on the outside of the heat exchange inner tube, and the cross-section of the heat exchange inner tube is semi-circular.

[0010] This utility model relates to a dryer for fertilizer production, which has significant technical advantages and positive effects compared with the prior art, specifically reflected in the following aspects: 1. Improve thermal efficiency and energy utilization: This invention achieves a multi-stage heat source composite heating mode by evenly arranging microwave heaters on both sides of the drying cylinder and a heating rod at the bottom, combined with an insulated outer shell. This design not only improves heating efficiency but also makes the heat distribution more uniform, avoiding the problems of localized overheating or incomplete drying of materials caused by uneven heating in traditional dryers.

[0011] In addition, a multi-stage heat recovery system is adopted to recover and reuse the waste heat generated during the drying process through a circulation pump and return air pipe, which significantly increases the hot air circulation path, further improves thermal efficiency, and reduces energy consumption.

[0012] 2. Improve the quality of material drying: The material is evenly distributed inside the drying cylinder by the servo motor-driven spiral feeder, resulting in more uniform heating and ensuring the quality of the dried material.

[0013] The activated carbon filter effectively filters out harmful gases generated during the drying process, improving the cleanliness of the drying environment and further ensuring the quality of the materials.

[0014] 3. Optimize structural design to enhance equipment stability: The receiving box at the bottom of the drying cylinder is connected to the base plate via support columns, which makes the structure stable and facilitates the collection and storage of materials.

[0015] The heating rod has a built-in temperature sensing element, which can monitor and regulate the temperature in real time to prevent overheating and improve the safety and stability of the equipment.

[0016] The window design on both sides of the drying cylinder facilitates the installation and maintenance of the microwave heater, improving the maintainability of the equipment.

[0017] 4. Significant environmental protection and energy-saving effects: By designing a multi-stage heat recovery system and a hot air circulation path, this invention significantly reduces energy consumption during the drying process, meeting the environmental protection requirements of energy conservation and emission reduction.

[0018] The exhaust box and exhaust fan effectively remove the waste gas generated during the drying process, reducing environmental pollution.

[0019] 5. Improve ease of use: The design of the feeding hopper and preheating coil allows the material to be preheated before entering the drying cylinder, shortening the drying time and improving production efficiency.

[0020] The design of the heat-conducting plate and heat exchange inner tube further optimizes the preheating effect, so that the material reaches a higher temperature when it enters the drying cylinder, reducing energy consumption during the drying process.

[0021] 6. Innovative technological solutions, representing the industry's development direction: This invention provides a novel fertilizer production drying technology solution through multiple technological innovations such as composite heating, multi-stage heat recovery, and hot air circulation, representing the technological development trend in the field of drying equipment.

[0022] Although there may be some cost increases in certain aspects, the overall benefits in improving drying efficiency, ensuring material quality, and saving energy and reducing emissions are significant, and it has broad market application prospects.

[0023] In summary, this utility model of a fertilizer production dryer has significant beneficial effects in terms of improving thermal efficiency, enhancing material drying quality, optimizing structural design, increasing equipment stability, environmental protection and energy saving, and ease of operation. It solves the problems of low heating efficiency, uneven heating, and energy waste in the prior art, and provides an efficient, environmentally friendly, and reliable drying solution for the fertilizer production field. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the internal structure of the present invention; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a schematic diagram of the feed hopper structure of this utility model; Figure 4 This is a schematic diagram of the cavity structure of this utility model; In the diagram: 1. Drying cylinder; 2. Circulating pump; 3. Return air pipe one; 4. Microwave heater; 5. Distribution pipe; 6. Preheating coil; 7. Feeding hopper; 8. Servo motor; 9. Support column; 10. Extraction box; 11. Base plate; 12. Discharge pipe; 13. Receiving box; 14. Insulated outer shell; 15. Spiral feed slurry; 16. Exhaust fan; 17. Heating rod; 18. Cavity; 19. Activated carbon filter element; 20. Air outlet; 21. Window; 22. Metal filter screen; 23. Heat conducting plate; 24. Heat exchange inner tube; 25. Insulation jacket; 26. Return air pipe; 27. Return air pipe two. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] Please see Figure 1-4 An embodiment of this utility model provides a fertilizer production dryer, including a drying cylinder 1, a receiving box 13 and a feeding hopper 7. A bottom plate 11 is provided below the drying cylinder 1 via a support column 9, and the receiving box 13 is provided inside the bottom plate 11. A heating rod 17 is provided at the bottom inside the drying cylinder 1. The heating rod 17 has a built-in temperature sensing element, and a groove structure for accommodating the heating rod 17 is provided at the bottom inside the drying cylinder 1.

[0027] Microwave heaters 4 are evenly arranged on both sides of the drying cylinder 1, and an insulating outer shell 14 is also provided on the outside of the drying cylinder 1.

[0028] The drying cylinder 1 has windows 21 on both sides for installing microwave heaters 4.

[0029] A servo motor 8 is installed at one end of the drying cylinder 1, and the output end of the servo motor 8 extends into the interior of the drying cylinder 1 and is equipped with a spiral feed slurry 15.

[0030] The drying cylinder 1 is the main working chamber of the dryer, and it is fixed to the base plate 11 by support columns 9. The support columns 9 are made of high-strength materials to ensure the stability and durability of the drying cylinder 1. A receiving box 13 is installed inside the base plate 11 to collect the dried fertilizer.

[0031] A heating rod 17 is installed at the bottom of the drying cylinder 1. The heating rod 17 has a built-in temperature sensing element, which can monitor and adjust the temperature in real time to ensure the uniformity and effectiveness of the drying process. The heating rod 17 is installed in a groove structure at the bottom of the drying cylinder 1. This groove structure not only fixes the heating rod 17, but also prevents the heating rod 17 from shifting in the drying environment.

[0032] Microwave heaters 4 are evenly arranged on both sides of the drying cylinder 1. The microwave heaters 4 are installed on the side wall of the drying cylinder 1 through windows 21. The design of the windows 21 ensures that the microwave heaters 4 are firmly installed and easy to maintain. The function of the microwave heaters 4 is to further accelerate the drying process of the fertilizer through microwave radiation.

[0033] To improve the thermal efficiency of the dryer, an insulating outer shell 14 is also provided on the outside of the drying cylinder 1. The insulating outer shell 14 is made of a material with excellent thermal insulation properties, which can effectively reduce heat loss and improve the overall working efficiency of the dryer.

[0034] A servo motor 8 is installed at one end of the drying cylinder 1. The output end of the servo motor 8 extends into the interior of the drying cylinder 1 and is fitted with a screw feed slurry 15. The servo motor 8 precisely controls the rotation speed and direction of the screw feed slurry 15 to achieve uniform feeding and mixing of fertilizer, ensuring uniform distribution of fertilizer within the drying cylinder 1.

[0035] A cavity 18 is provided at the other end of the drying cylinder 1.

[0036] An air outlet 20 is provided between the cavity 18 and the drying cylinder 1, and a metal filter screen 22 is provided inside the air outlet 20.

[0037] The cavity 18 is equipped with an activated carbon filter element 19, and a circulation pump 2 is installed on the top of the drying cylinder 1. The input pipe of the circulation pump 2 extends into the cavity 18, and the output end of the circulation pump 2 is equipped with a return air pipe 3. The output end of the return air pipe 3 is equipped with a distribution pipe 5. The bottom of the distribution pipe 5 is evenly equipped with return air pipes 26, and the output end of the return air pipes 26 extends evenly to the top of the inside of the drying cylinder 1.

[0038] A cavity 18 is provided at the other end of the drying cylinder 1. The main function of the cavity 18 is to filter and circulate the gas. The cavity 18 is also made of a high-temperature resistant and corrosion-resistant metal material, and its shape is a cylinder that is compatible with the drying cylinder 1.

[0039] An air vent 20 is provided between the cavity 18 and the drying cylinder 1. The function of the air vent 20 is to discharge the hot and humid air inside the drying cylinder 1 into the cavity 18. A metal filter 22 is provided inside the air vent 20. The metal filter 22 is made of stainless steel and has a mesh diameter of 0.5 mm. Its main function is to intercept dust and impurities generated during the drying process and prevent them from entering the cavity 18.

[0040] The cavity 18 contains an activated carbon filter element 19. The activated carbon filter element 19 is made of high-quality activated carbon, and its shape is cylindrical, with a diameter that matches the inner diameter of the cavity 18. The main function of the activated carbon filter element 19 is to adsorb odors and harmful substances in the air, ensuring the cleanliness of the circulating air.

[0041] A circulation pump 2 is installed on the top of the drying cylinder 1. The circulation pump 2 is made of high-temperature resistant plastic and has a power of 1.5 kilowatts. The input pipe of the circulation pump 2 extends into the interior of the cavity 18, and the end of the input pipe is provided with an air intake (not shown in the figure) for drawing in clean air that has been filtered by the metal filter screen 22 and the activated carbon filter element 19.

[0042] The output end of the circulating pump 2 is equipped with a return air pipe 3, which is made of stainless steel and has a diameter of 50 mm. The output end of the return air pipe 3 is equipped with a distribution pipe 5, which is made of aluminum alloy, has a ring-shaped shape, and its diameter matches the inner diameter of the drying cylinder 1. Four return air pipes 26 are evenly distributed around the bottom of the distribution pipe 5.

[0043] The return air duct 26 is made of stainless steel and has a diameter of 25 mm. Its output end extends evenly to the top of the inside of the drying cylinder 1, ensuring that the circulating air can be evenly distributed to all parts of the drying cylinder 1. The end of the return air duct 26 is equipped with a nozzle (not shown in the figure). The nozzle is designed in a conical shape, which allows the circulating air to be ejected at high speed, forming a uniform airflow.

[0044] A feed hopper 7 is installed on the outside of the feed inlet at the top of the drying cylinder 1. The outside of the discharge outlet at the bottom of the drying cylinder 1 is connected to the receiving box 13 through the discharge pipe 12. An exhaust box 10 is installed on the outside of the opening at the top of the receiving box 13. An exhaust fan 16 is installed inside the exhaust box 10, and a return air pipe 27 connected to the preheating coil 6 on the outside of the feed hopper 7 is installed on the top of the exhaust box 10.

[0045] A heat-conducting plate 23 is provided on the side wall of the feed hopper 7 inside the preheating coil 6.

[0046] The preheating coil 6 includes a heat exchange inner tube 24 that is attached to the heat conduction plate 23 and an insulation sleeve 25 disposed on the outside of the heat exchange inner tube 24, and the cross-section of the heat exchange inner tube 24 is semi-circular.

[0047] Feeding hopper 7: The feeding hopper 7 is installed on the outside of the feed inlet at the top of the drying cylinder 1 and is used to store and transport the material to be dried. A heat-conducting plate 23 is provided on the inner side wall of the feeding hopper 7 for preheating the material.

[0048] Preheating coil 6: The preheating coil 6 is installed on the outside of the feed tank 7 and includes an inner heat exchange tube 24 and an insulation jacket 25. The inner heat exchange tube 24 has a semi-circular cross-section and is in close contact with the heat conduction plate 23 to ensure efficient heat transfer. The insulation jacket 25 is located on the outside of the inner heat exchange tube 24 to reduce heat loss.

[0049] Heat-conducting plate 23: The heat-conducting plate 23 is located on the inner side wall of the feed barrel 7 and is in close contact with the heat exchange inner tube 24. It is used to transfer the heat of the preheating coil 6 to the material.

[0050] Discharge pipe 12: The discharge pipe 12 is connected to the outside of the discharge port at the bottom of the drying cylinder 1 and is used to transport the dried material to the receiving box 13.

[0051] Receiving bin 13: The receiving bin 13 is connected to the drying cylinder 1 via the discharge pipe 12 and is used to collect the dried material. An extraction box 10 is provided on the outside of the top opening of the receiving bin 13.

[0052] Extraction box 10: The extraction box 10 is installed on the outside of the opening at the top of the receiving box 13. An exhaust fan 16 is installed inside to extract the moisture generated during the drying process. The top of the extraction box 10 is equipped with a return air pipe 27, which is connected to the preheating coil 6 on the outside of the feed hopper 7.

[0053] Exhaust fan 16: The exhaust fan 16 is located inside the exhaust box 10. It generates negative pressure through operation, extracts moisture and returns it to the preheating coil 6 through the return pipe 27, so as to realize the recycling of heat.

[0054] When this application embodiment is used, Preparation stage Equipment Inspection: Before starting the dryer, check that the drying cylinder, support columns, base plate, and other components are stable and that all connections are secure. Check that the power connections of electrical equipment such as heating rods, microwave heaters, servo motors, circulating pumps, and exhaust fans are normal and that the wires are undamaged. Inspect the metal filter screen and activated carbon filter for blockages or damage; if any are found, clean or replace them promptly.

[0055] Material preparation: Place the fertilizer to be dried into the feeding hopper. At this time, the exhaust fan in the extraction box operates, drawing out humid air from the top of the receiving hopper and sending it through return air pipe two into the preheating coil on the outside of the feeding hopper. The heat exchange inner tube inside the preheating coil is in contact with the heat-conducting plate on the side wall of the feeding hopper, transferring heat to the heat-conducting plate, thereby preheating the fertilizer in the feeding hopper. After preheating is complete, wait for the next step.

[0056] Drying stage Start the equipment: Connect the power supply to the dryer and start the servo motor, heating rod, microwave heater, and circulating pump. The servo motor drives the screw feeder to rotate, sending the preheated fertilizer in the feed hopper into the drying cylinder.

[0057] Composite heating: The heating rod begins operation, its built-in temperature sensing element monitoring the temperature in real time and automatically adjusting the heating power according to the set temperature. Simultaneously, microwave heaters on both sides of the drying cylinder emit microwaves to radiate heat onto the fertilizer. An insulated outer shell reduces heat loss from the drying cylinder, improving thermal efficiency. Under the action of the screw feed slurry, the fertilizer is evenly distributed within the drying cylinder, ensuring it receives sufficient heating.

[0058] Gas Circulation: The hot, humid air generated during the drying process is discharged through the air outlet between the drying cylinder and the chamber. After passing through the metal filter inside the outlet, dust and impurities are intercepted. Next, the air enters the chamber and passes through the internal activated carbon filter, which adsorbs odors and harmful substances, thus purifying the air. The circulation pump draws the purified air out of the chamber and sends it back to the top of the drying cylinder through return air pipe 1, distribution pipe, and return air pipe, achieving hot air circulation and further improving thermal efficiency and drying uniformity.

[0059] Discharge stage Drying complete: Once the fertilizer has reached the predetermined drying level (which can be determined by setting parameters such as time, temperature, or humidity), turn off the heating rod, microwave heater, and servo motor. At this point, the screw feeder stops rotating, and the dried fertilizer remains at the bottom of the drying cylinder.

[0060] Unloading operation: Open the unloading pipe valve, and the dried fertilizer falls into the receiving box through the unloading pipe. During the unloading process, the exhaust fan in the extraction box continues to work to extract any moisture that may be generated in the receiving box, and sends it to the preheating coil through the return air pipe 2 to reuse the heat.

[0061] End Phase Equipment cleaning: Regularly clean the metal filter screen to remove trapped dust and impurities; replace or regenerate the activated carbon filter element to ensure its adsorption effect. Clean the inside of the drying cylinder to prevent residual fertilizer from affecting the quality of the next drying cycle.

[0062] Equipment Maintenance: Inspect the operation of all components, such as heating rods, microwave heaters, servo motors, circulating pumps, and exhaust fans. Repair or replace any abnormalities promptly. Inspect the electrical system of the equipment to ensure safe operation. Turn off the power to the dryer to prepare for the next use.

[0063] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fertilizer production dryer, comprising a drying cylinder (1), a receiving box (13), and a feeding hopper (7), characterized in that: The bottom plate (11) is provided below the drying cylinder (1) by a support column (9), and a receiving box (13) is provided inside the bottom plate (11). A heating rod (17) is provided at the bottom inside the drying cylinder (1), and microwave heaters (4) are evenly provided on both sides of the drying cylinder (1). An insulation outer shell (14) is also provided on the outside of the drying cylinder (1). A servo motor (8) is installed at one end of the drying cylinder (1), and the output end of the servo motor (8) extends into the interior of the drying cylinder (1) and is equipped with a spiral feed slurry (15). A cavity (18) is provided at the other end of the drying cylinder (1), and an activated carbon filter element (19) is provided inside the cavity (18). A circulation pump (2) is also installed at the top of the drying cylinder (1). The input pipe of the circulation pump (2) extends into the interior of the cavity (18), and a return air pipe (3) is provided at the output end of the circulation pump (2). A distribution pipe (5) is provided at the output end of the return air pipe (3). A return air pipe (26) is uniformly provided at the bottom of the distribution pipe (5), and the output end of the return air pipe (26) extends uniformly into the top of the interior of the drying cylinder (1). A feeding hopper (7) is installed on the outside of the top inlet of the drying cylinder (1). The outside of the bottom outlet of the drying cylinder (1) is connected to the receiving box (13) through the unloading pipe (12). An exhaust box (10) is provided on the outside of the opening at the top of the receiving box (13). An exhaust fan (16) is provided inside the exhaust box (10). A return air pipe (27) is provided on the top of the exhaust box (10) and connected to the preheating coil (6) on the outside of the feeding hopper (7).

2. The fertilizer production dryer according to claim 1, characterized in that: An air outlet (20) is provided between the cavity (18) and the drying cylinder (1), and a metal filter (22) is provided inside the air outlet (20).

3. The fertilizer production dryer according to claim 1, characterized in that: The heating rod (17) has a built-in temperature sensing element, and the bottom of the drying cylinder (1) is provided with a groove structure for accommodating the heating rod (17).

4. A fertilizer production dryer according to claim 1, characterized in that: The drying cylinder (1) has windows (21) on both sides for installing microwave heaters (4).

5. A fertilizer production dryer according to claim 1, characterized in that: A heat-conducting plate (23) is provided on the side wall of the feed hopper (7) inside the preheating coil (6).

6. A fertilizer production dryer according to claim 1, characterized in that: The preheating coil (6) includes a heat exchange inner tube (24) that is attached to the heat-conducting plate (23) and an insulation sleeve (25) disposed on the outside of the heat exchange inner tube (24), and the cross section of the heat exchange inner tube (24) is semi-circular.

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