Drying device

Abstract

The utility model relates to a drying device, which belongs to the technical field of forage drying and comprises a drying box, a mesh belt type conveyor, a material uniformizing frame, a material guide base, an air outlet hopper, an air duct type electric heater, an air-air heat exchanger, an air inlet fan and a high-power centrifugal fan, and the mesh belt type conveyor, the material uniformizing frame, the material guide base and the air outlet hopper are all mounted in the drying box. And the air outlet hopper, the air duct type electric heater, the gas-gas heat exchanger and the air inlet fan are communicated in sequence. According to the forage drying device, the centrifugal fan is arranged, a negative-pressure and low-pressure environment can be formed through the centrifugal fan, and therefore evaporation of water in forage at the low temperature can be accelerated by lowering the boiling point, the drying rate is increased, and damage of high temperature to nutrition is reduced; fresh cold air entering the hot-blast stove can be preheated through discharged damp and hot waste gas containing heat, so that the fuel consumption of the hot-blast stove is remarkably reduced, the operation cost is reduced, and the total heat efficiency of the system is improved.

Description

Technical Field

[0001] This utility model relates to the field of hay drying technology, and in particular to a drying device. Background Technology

[0002] Agricultural forage needs to have its moisture content rapidly reduced to a safe storage level to inhibit microbial activity, prevent mold and spoilage, maximize the preservation of nutritional value, facilitate long-term safe storage, maintain color and palatability, reduce weather dependence, and ensure production plans are met.

[0003] A search revealed a Chinese patent with publication number CN202221059339.5 that discloses a forage drying device for cattle. This device utilizes a dispersing rod to disperse the forage fed through the feed pipe, increasing the contact area between the forage and air. This facilitates thorough drying by the heating lamps, improving the drying efficiency. A rotating disc drives a slider to move up and down repeatedly, which in turn drives a moving plate and the dispersing rod to move up and down repeatedly, causing the dispersing rod to continuously lift and disperse the forage, thus improving the dispersion efficiency.

[0004] The above-mentioned technical solution has the following drawbacks: Although such a drying device can uniformly convey the forage through a dispersing rod, making the introduced forage more uniform, in actual use, the hot air temperature is usually below 100℃. The forage is dried in a low-temperature environment, resulting in low drying efficiency. To further improve the forage drying efficiency, a drying device is proposed, which is equipped with a centrifugal fan. The centrifugal fan can create a negative pressure environment, thereby accelerating the evaporation of internal moisture in the forage at a lower temperature by lowering the boiling point, increasing the drying rate, and reducing the damage to nutrients caused by high temperature. A hot air circulation module is also provided, which can preheat the fresh cold air entering the hot air furnace by the exhaust humid waste gas that still contains heat, thereby significantly reducing the fuel consumption of the hot air furnace, reducing operating costs, and improving the overall thermal efficiency of the system.

[0005] In view of this, this work improves and solves the above problems. Through dedicated research and application of theoretical principles, a technical solution with a reasonable design that can effectively improve the above defects has finally been proposed.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the general background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0007] This invention provides a drying device that solves the problems mentioned in the background. It is equipped with a centrifugal fan, which can create a negative pressure environment, thereby accelerating the evaporation of internal moisture in the forage at a lower temperature by lowering the boiling point, thus increasing the drying rate and reducing the damage to nutrients caused by high temperature. It is also equipped with a hot air circulation module, which can preheat the fresh cold air entering the hot air furnace by the exhaust humid waste gas that still contains heat, thereby significantly reducing the fuel consumption of the hot air furnace, reducing operating costs, and improving the overall thermal efficiency of the system.

[0008] The present invention provides the following solution to the above-mentioned technical problems: A drying device includes a drying chamber, a mesh belt conveyor, a material distribution rack, a material guide base, an air outlet hopper, a duct-type electric heater, an air-to-air heat exchanger, an air intake fan, and a high-power centrifugal fan. The mesh belt conveyor, material distribution rack, material guide base, and air outlet hopper are all installed inside the drying chamber. The air outlet hopper, duct-type electric heater, air-to-air heat exchanger, and air intake fan are connected in sequence. The drying chamber is equipped with a forage inlet hopper and a forage outlet hopper. The material distribution rack is rotatably connected to a material distribution screw rod. The material distribution rack is equipped with a drive motor. The drive end of the drive motor is connected to the material distribution screw rod through a coupling. The drying chamber, the high-power centrifugal fan, and the air-to-air heat exchanger are connected in sequence.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the outer wall of the material equalization screw is provided with two sets of spiral blades, which face opposite directions.

[0011] Furthermore, both the feed hopper and the discharge hopper are equipped with hydraulic telescopic sealing doors, the guide base is evenly equipped with support springs, the support springs are equipped with vibrating plates, and the vibrating plates are equipped with vibrating motors.

[0012] Furthermore, the gas-to-gas heat exchanger is fixedly connected to an exhaust pipe, and the drying chamber is equipped with a negative pressure sensor.

[0013] Furthermore, the air extraction volume of the high-power centrifugal fan is greater than the sum of the air intake fan and the steam generated by the evaporation of moisture from the forage.

[0014] Furthermore, the impeller of the high-power centrifugal fan is made of duplex stainless steel with a fiberglass coating, the casing is made of stainless steel with a fluororubber lining, the main shaft is made of stainless steel, and a quick-opening maintenance door is provided.

[0015] Furthermore, the air inlet pipe of the high-power centrifugal fan is equipped with a protective net.

[0016] Furthermore, the high-power centrifugal fan is connected to the heating channel of the gas-to-gas heat exchanger, and the duct-type electric heater and the air intake fan are connected to the ventilation pipe of the gas-to-gas heat exchanger.

[0017] This utility model provides a drying device, which has the following advantages:

[0018] 1. Equipped with a centrifugal fan, which can create a negative pressure environment, thereby accelerating the evaporation of moisture inside the forage at a lower temperature by reducing the boiling point, increasing the drying rate and reducing the damage of high temperature to nutrients;

[0019] 2. Equipped with a hot air circulation module, it can preheat the fresh cold air entering the hot air furnace by the exhaust humid waste gas that still contains heat, thereby significantly reducing the fuel consumption of the hot air furnace, reducing operating costs, and improving the overall thermal efficiency of the system.

[0020] 3. Equipped with a material distribution component, it can evenly spread the straw in the drying chamber, allowing it to come into uniform contact with the drying air, thereby further improving drying efficiency.

[0021] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it according to the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. The specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a drying device provided in an embodiment of the present invention;

[0024] Figure 2 A front view of a drying device provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of a gas-to-gas heat exchanger in a drying device according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the material distribution rack in a drying device according to an embodiment of the present invention.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Drying oven; 2. Mesh belt conveyor; 3. Material distribution rack; 4. Material guide base; 5. Forage feed hopper; 6. Forage discharge hopper; 7. Air outlet hopper; 8. Duct-type electric heater; 9. Air-to-air heat exchanger; 10. Air intake fan; 11. High-power centrifugal fan; 12. Material distribution screw; 13. Drive motor; 14. Hydraulic telescopic sealing door; 15. Support spring; 16. Vibrating plate; 17. Vibrating motor; 18. Exhaust pipe; 19. Negative pressure sensor. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-4 The principles and features of this utility model are described below. The examples given are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0030] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figure 1-4As shown, a drying device includes a drying chamber 1, a mesh belt conveyor 2, a material distribution rack 3, a material guide base 4, an air outlet hopper 7, an air duct type electric heater 8, an air-to-air heat exchanger 9, an air intake fan 10, and a high-power centrifugal fan 11. The mesh belt conveyor 2, the material distribution rack 3, the material guide base 4, and the air outlet hopper 7 are all installed inside the drying chamber 1. The air outlet hopper 7, the air duct type electric heater 8, the air-to-air heat exchanger 9, and the air intake fan 10 are connected in sequence. The drying chamber 1 is equipped with a forage inlet hopper 5 and a forage outlet hopper 6. The material distribution rack 3 is rotatably connected to a material distribution screw rod 12. The material distribution rack 3 is equipped with a drive motor 13. The drive end of the drive motor 13 is connected to the material distribution screw rod 12 through a coupling. The drying chamber 1, the high-power centrifugal fan 11, and the air-to-air heat exchanger 9 are connected in sequence.

[0033] Preferably, the outer wall of the uniform feed screw 12 is provided with two sets of spiral blades, and the two sets of spiral blades face opposite directions.

[0034] Preferably, both the feed hopper 5 and the feed discharge hopper 6 are equipped with hydraulic telescopic sealing doors 14, the guide base 4 is evenly equipped with support springs 15, the support springs 15 are equipped with vibrating plates 16, and the vibrating plates 16 are equipped with vibrating motors 17.

[0035] Preferably, the gas-to-gas heat exchanger 9 is fixedly connected to the exhaust pipe 18, and the drying box 1 is equipped with a negative pressure sensor 19.

[0036] Preferably, the air volume of the high-power centrifugal fan 11 is greater than 1.25 times the sum of the air intake fan 10 and the steam generated by the evaporation of moisture from the forage.

[0037] Preferably, the impeller of the high-power centrifugal fan 11 is made of 2205 duplex stainless steel with a fiberglass coating, the shell is made of 316L stainless steel with a fluororubber lining, the main shaft is made of stainless steel, and a quick-opening maintenance door is provided.

[0038] Preferably, the air inlet pipe of the high-power centrifugal fan 11 is equipped with a protective net.

[0039] Preferably, the high-power centrifugal fan 11 is connected to the heating channel of the gas-to-gas heat exchanger 9, and the duct-type electric heater 8 and the air intake fan 10 are connected to the ventilation pipe of the gas-to-gas heat exchanger 9.

[0040] The specific working principle and usage method of this utility model are as follows: First, start the air duct electric heater 8, air-to-air heat exchanger 9, and air intake fan 10. The drying air is introduced through the air outlet 7 to preheat the drying box 1. After preheating, open the upper hydraulic telescopic sealing door 14. The straw is transferred to the equalization rack 3 through the straw feed hopper 5. Start the drive motor 13 to drive the equalization spiral rod 12 to rotate in the equalization rack 3, so that the introduced straw can be evenly transferred down under the action of the spiral blades. Start the vibration motor 17 to drive the vibration plate 16 on the top of the guide base 4 to vibrate, so that the straw can be evenly transferred to the mesh belt conveyor 2. Start the mesh belt conveyor 2. The mesh belt conveyor 2 can evenly spread the straw on the top. After spreading, close the hydraulic telescopic sealing door 14 and start the high-power centrifugal fan 11.

[0041] Taking the treatment of 5 t / h alfalfa with a moisture content of 75% to 15% and an evaporation rate of 3000 kg / h as an example, the evaporation rate Q_evaporation = 3000 × 1.25 = 3750 m³ / h. 3 / h

[0042] Hot air Q hot air = 15000m 3 / h80℃ hot air

[0043] The induced draft of the high-power centrifugal fan 11 is greater than 1.25 × (15000 + 3750) = 23437.5 m³. 3 / h;

[0044] Maintaining a negative pressure of approximately -80 Pa inside the drying oven reduces the moisture evaporation temperature to 60–80℃, thereby effectively improving drying efficiency.

[0045] The intake fan 10 transmits the air from the outer wall to the air-to-air heat exchanger 9. The duct-type electric heater 8 can heat the air, and the drying air can be transmitted through the air outlet 7 to dry the straw on the top of the mesh belt conveyor 2. The high-power centrifugal fan 11 can transmit the drying exhaust gas with residual heat to the air-to-air heat exchanger 9, so that it can be reused to heat the fresh air. The heated exhaust gas can be discharged from the exhaust pipe 18, which can be connected to the factory exhaust gas pipeline.

[0046] After heating is complete, the bottom hydraulic telescopic sealing door 14 can be opened, and the mesh belt conveyor 2 can be started to discharge the straw from the bottom straw discharge hopper 6.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Those skilled in the art can readily implement this utility model based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the utility model's technical solution, utilizing the disclosed technical content, are equivalent embodiments of this utility model. Furthermore, any equivalent changes, alterations, or variations made to the above embodiments based on the essential technology of this utility model are still within the protection scope of this utility model's technical solution.

Claims

1. A drying apparatus, comprising a drying chamber (1), a mesh belt conveyor (2), a material distribution rack (3), a material guide base (4), an air outlet hopper (7), a duct-type electric heater (8), an air-to-air heat exchanger (9), an air inlet fan (10), and a high-power centrifugal fan (11), characterized in that: The mesh belt conveyor (2), the material distribution frame (3), the material guide base (4), and the air outlet hopper (7) are all installed inside the drying box (1). The air outlet hopper (7), the air duct electric heater (8), the air-to-air heat exchanger (9), and the air intake fan (10) are connected in sequence. The drying box (1) is equipped with a grass feed hopper (5) and a grass discharge hopper (6). The material distribution frame (3) is rotatably connected to a material distribution screw rod (12). The material distribution frame (3) is equipped with a drive motor (13). The drive end of the drive motor (13) is connected to the material distribution screw rod (12) through a coupling. The drying box (1), the high-power centrifugal fan (11), and the air-to-air heat exchanger (9) are connected in sequence.

2. The drying apparatus according to claim 1, characterized in that, The outer wall of the uniform material screw (12) is provided with two sets of spiral blades, and the two sets of spiral blades face opposite directions.

3. The drying apparatus according to claim 1, characterized in that, Both the feed hopper (5) and the discharge hopper (6) are equipped with hydraulic telescopic sealing doors (14). The guide base (4) is evenly equipped with support springs (15). The support springs (15) are equipped with vibrating plates (16). The vibrating plates (16) are equipped with vibrating motors (17).

4. The drying apparatus according to claim 1, characterized in that, The gas-to-gas heat exchanger (9) is fixedly connected to an exhaust pipe (18), and the drying box (1) is equipped with a negative pressure sensor (19).

5. The drying apparatus according to claim 1, characterized in that, The air volume of the high-power centrifugal fan (11) is greater than 1.25 times the sum of the air intake fan (10) and the steam generated by the evaporation of moisture from the forage.

6. The drying apparatus according to claim 1, characterized in that, The impeller of the high-power centrifugal fan (11) is made of 2205 duplex stainless steel with a fiberglass coating, the shell is made of 316L stainless steel with a fluororubber lining, the main shaft is made of stainless steel, and a quick-opening maintenance door is provided.

7. The drying apparatus according to claim 1, characterized in that, The air inlet pipe of the high-power centrifugal fan (11) is equipped with a protective net.

8. The drying apparatus according to claim 1, characterized in that, The high-power centrifugal fan (11) is connected to the heating channel of the gas-to-gas heat exchanger (9), and the duct-type electric heater (8) and the air intake fan (10) are connected to the ventilation pipe of the gas-to-gas heat exchanger (9).

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