A feed dryer waste heat recuperator

Abstract

The utility model discloses a kind of feed dryer waste heat recoveries, including dryer body, the upper portion of the dryer body is equipped with top plate, the front end of the top plate is fixed with feed hopper, the top plate is fixed with heat preservation box, the front end of the heat preservation box is enclosed in the bottom of the feed hopper, the front end and rear end of the feed hopper are respectively fixed with multiple first heat-conducting fins;In the feed dryer waste heat recovery, by setting first heat-conducting fin and second heat-conducting fin in the front end, rear end and both sides of feed hopper, multidimensional heat exchange path is formed, the contact area of heat-conducting component and waste heat gas is greatly increased, and heat exchange efficiency is improved, simultaneously, by first gas pipe and second gas pipe, waste heat gas discharged from dryer body is introduced into heat preservation box, then by fan, gas after heat exchange is sent back heating box, the recycling of waste heat is realized, energy waste is reduced, and production cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of feed processing equipment technology, specifically to a waste heat recovery device for a feed dryer. Background Technology

[0002] In the feed processing and production process, dryers are an essential piece of equipment. They are mainly used to dry feed raw materials to reduce the moisture content and extend the shelf life of the feed. However, traditional feed dryers generate a large amount of waste heat during operation, which is usually directly released into the atmosphere, resulting in not only energy waste but also environmental pollution.

[0003] Some existing feed dryer waste heat recovery devices use a single-sided heat conduction structure to preheat the feed inside the feed hopper. Because a multi-dimensional heat exchange path is not formed, the contact area between the heat conduction component and the waste heat gas is limited, and the gas flow path is short, resulting in the heat not being fully absorbed before being discharged, causing a certain amount of energy waste. Meanwhile, the waste heat gas is directly discharged after simple heat exchange. The residual heat in the discharged gas cannot be reused. Especially when the dryer needs to maintain a high temperature, additional energy needs to be consumed to replenish the heat, which further increases the production cost. Therefore, it is necessary to design a waste heat recovery device for feed dryers to solve the above problems.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a waste heat recovery device for a feed dryer to solve the problems mentioned in the background art.

[0006] The technical solution adopted by this application to solve its technical problem is: a waste heat recovery device for a feed dryer, including a dryer body, a top plate installed on the upper part of the dryer body, a feed hopper fixed through the front end of the top plate, an insulation box fixed on the top plate, the front end of the insulation box surrounding the bottom of the feed hopper, a plurality of first heat-conducting plates fixed at the front end and rear end of the feed hopper, the first heat-conducting plates all penetrating the feed hopper and extending into the insulation box, and a plurality of second heat-conducting plates fixed on both sides of the feed hopper, the second heat-conducting plates all penetrating the feed hopper and extending into the insulation box; A first air supply pipe is installed through the exhaust port of the dryer body, and the other end of the first air supply pipe is connected through to the heat preservation box. A heating box is installed on one side of the dryer body, and a fan is installed through the heating box. The air outlet of the fan is connected through to the heating box. A second air supply pipe is installed through the front end of the heat preservation box, and the other end of the second air supply pipe is connected to the air inlet of the fan, which is suitable for waste heat recycling.

[0007] Furthermore, the portion of the first heat-conducting sheet located inside the feed hopper is designated as a first heat-conducting surface, and the inclination angle of the first heat-conducting surface is adapted to the feed guiding angle of the feed hopper, which is suitable for reducing feed obstruction.

[0008] Furthermore, the portion of the second heat-conducting sheet located inside the feed hopper is designated as a second heat-conducting surface, and the inclination angle of the second heat-conducting surface is adapted to the feed guiding angle of the feed hopper, which is suitable for reducing feed stagnation.

[0009] Furthermore, a sealing plate is installed on the insulation box.

[0010] Furthermore, a plurality of baffles are fixed to the rear end of the sealing plate, and the baffles are located inside the insulation box.

[0011] Furthermore, the front end of the sealing plate is fixed with an installation frame located inside the insulation box, and a filter plate is installed inside the installation frame.

[0012] Furthermore, at least two handles are fixed to the sealing plate.

[0013] By adopting the above technical solution, the problems of energy waste and increased production costs caused by the single-sided heat conduction structure of existing feed dryer waste heat recovery devices, which result in a single heat exchange path, insufficient contact area, and non-recycling of waste heat gas are solved.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The waste heat recovery device of the feed dryer forms a multi-dimensional heat exchange path by setting the first heat-conducting plate and the second heat-conducting plate at the front end, rear end and both sides of the feed hopper, which greatly increases the contact area between the heat-conducting components and the waste heat gas and improves the heat exchange efficiency. At the same time, the waste heat gas discharged from the dryer body is introduced into the heat preservation box through the first gas supply pipe and the second gas supply pipe, and then the heat-exchanged gas is sent back to the heating box by the fan, realizing the recycling of waste heat, reducing energy waste and lowering production costs. Attached Figure Description

[0015] Figure 1 This is a first three-dimensional structural schematic diagram of a waste heat recovery device for a feed dryer according to an embodiment of this application; Figure 2This is a second three-dimensional structural schematic diagram of a waste heat recovery device for a feed dryer according to an embodiment of this application; Figure 3 This is a cross-sectional view of the insulated box and a first assembly drawing of the internal parts according to an embodiment of this application; Figure 4 This is a cross-sectional view of the insulated box, the feed hopper, and the first heat-conducting sheet according to an embodiment of this application; Figure 5 This is a cross-sectional view of the insulated box and a second assembly drawing of the internal parts according to an embodiment of this application.

[0016] In the diagram: 1. Dryer body; 2. Top plate; 3. Feed hopper; 4. Insulation box; 5. First heat-conducting plate; 6. Second heat-conducting plate; 7. First heat-conducting surface; 8. Second heat-conducting surface; 9. First air supply pipe; 10. Second air supply pipe; 11. Sealing plate; 12. Handle; 13. Baffle plate; 14. Mounting frame; 15. Filter plate; 16. Heating box; 17. Fan. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-5 This invention provides a technical solution: a waste heat recovery device for a feed dryer, comprising a dryer body 1, a top plate 2, a feed hopper 3, an insulation box 4, and a fan 17. The dryer body 1 is the main equipment for feed drying, and it has a drying chamber inside for drying feed raw materials. The top plate 2 is bolted to the upper part of the dryer body 1, serving to cover, seal, and support. The feed hopper 3 is fixed to the front end of the top plate 2 and is used to feed feed raw materials into the drying chamber of the dryer body 1. The feed raw materials enter the drying chamber from the feed hopper 3, and a high-temperature environment is generated inside the chamber by a heating device, such as electric heating, to dry the feed raw materials.

[0019] The insulation box 4 is welded and fixed to the top plate 2, with its front end enclosing the bottom of the feed hopper 3, forming a relatively enclosed space to reduce heat loss during transmission. Multiple first heat-conducting plates 5 are fixed to the front and rear ends of the feed hopper 3, each penetrating the feed hopper 3 and extending into the insulation box 4. Multiple second heat-conducting plates 6 are fixed to both sides of the feed hopper 3, each penetrating the feed hopper 3 and extending into the insulation box 4. The first and second heat-conducting plates 5 and 6 are made of 6063 aluminum alloy with a thermal conductivity ≥205W / (m・K), and their surfaces are anodized for high-temperature oxidation resistance.

[0020] The portion of the first heat-conducting plate 5 located within the feed hopper 3 is designated as the first heat-conducting surface 7. The inclination angle of the first heat-conducting surface 7 is adapted to the feed guiding angle of the feed hopper 3. Typically, the feed guiding angle of the feed hopper 3 is 45°-60°, and the inclination angle of the first heat-conducting surface 7 is also set to 45°-60°. This reduces the obstruction of feed within the feed hopper 3 and ensures smooth feed delivery. Similarly, the portion of the second heat-conducting plate 6 located within the feed hopper 3 is designated as the second heat-conducting surface 8. The inclination angle of the second heat-conducting surface 8 is also adapted to the feed guiding angle of the feed hopper 3, also at 45°-60°.

[0021] A first gas supply pipe 9 is installed through the exhaust port of the dryer body 1 via a flange. The other end of the first gas supply pipe 9 is connected to the heat preservation box 4 through a flange, which is used to introduce the waste heat gas discharged from the dryer body 1 into the heat preservation box 4. A heating box 16 is installed through one side of the dryer body 1. The heating box 16 is equipped with a heating device for heating the circulating gas. The air outlet of the fan 17 is installed through the heating box 16. The fan 17 is a reversible centrifugal fan. A reversible centrifugal fan is a ventilation device that uses a symmetrical impeller, bidirectional volute and other structural designs to change the direction of the motor to switch the functions of the air inlet and outlet. It is similar in appearance to a traditional centrifugal fan and is used to provide power to circulate the gas in the system. The air outlet of the fan 17 extends into the heating box 16. The heating device in the heating box 16 monitors the temperature of the gas entering the heating box 16 in real time through a temperature sensor. The temperature signal is converted into an electrical signal and transmitted to the control system. The control system compares the received temperature value with the preset drying temperature. When the gas temperature is lower than the preset value, it automatically adjusts the power of the heating device (such as turning on the number of electric heating tubes or increasing the current) to supplement the heat until the gas temperature reaches the set range. This achieves cyclical control of the gas temperature and ensures that the gas temperature entering the dryer body 1 from the fan 17 is stable. The front end of the heat preservation box 4 is connected to the second air supply pipe 10 through the flange, and the other end of the second air supply pipe 10 is connected to the air intake of the fan 17 to form a waste heat recycling.

[0022] A sealing plate 11 is bolted to the heat preservation box 4 to seal the heat preservation box 4 and reduce the leakage of waste heat gas. Multiple baffles 13 are welded to the rear end of the sealing plate 11. When waste heat gas enters the heat preservation box 4 through the first gas supply pipe 9, the waste heat gas will first come into contact with the baffles 13. These baffles 13 are arranged at staggered angles, so that the gas forms an S-shaped flow trajectory in the heat preservation box 4, prolonging the residence time of the gas in the box and improving the heat exchange efficiency. A mounting frame 14 located in the heat preservation box 4 is welded to the front end of the sealing plate 11. A filter plate 15 is bolted to the mounting frame 14. The filter plate 15 is made of 304 stainless steel sintered mesh (pore size 50μm) with a composite PTFE hydrophobic coating, which can intercept more than 90% of dust particles. At the same time, the hydrophobic coating (contact angle > 110°) prevents liquid water from condensing, reducing the entry of impurities into the heating box 16 and the dryer body 1, which would affect the normal operation of the equipment and the quality of the feed. At least two handles 12 are fixed on the sealing plate 11 to facilitate the disassembly and installation of the sealing plate 11 by the staff.

[0023] Working principle: When the feed dryer is powered on, the feed raw materials enter the drying chamber of the dryer body 1 from the feed hopper 3 for drying. The waste heat generated during the drying process is discharged from the exhaust port of the dryer body 1 and enters the heat preservation box 4 through the first air supply pipe 9. At this time, the waste heat gas will first contact the baffle 13 at the rear end of the sealing plate 11. These baffles 13 are arranged at staggered angles, so that the gas forms an S-shaped flow trajectory in the heat preservation box 4, prolonging the residence time of the gas in the box. Then the gas continues to flow to the filter plate 15 at the front end of the sealing plate 11. The filter plate 15 can intercept some of the feed dust and impurities in the gas. The purified gas flows and comes into contact with the first heat-conducting plate 5 and the second heat-conducting plate 6. The first heat-conducting plate 5 and the second heat-conducting plate 6 are arranged vertically in a trapezoidal shape on the heat preservation box 4 and the feeding hopper 3. The first heat-conducting plate 5 at the front end and rear end of the feeding hopper 3 and the second heat-conducting plate 6 on both sides simultaneously absorb the heat of the gas in the heat preservation box 4 and conduct the heat to the feed raw materials in the feeding hopper 3, thereby achieving multi-dimensional preheating. Since the tilt angle of the first heat-conducting surface 7 and the second heat-conducting surface 8 is adapted to the guiding angle of the feeding hopper 3, the feed raw materials can absorb the heat transferred by the first heat-conducting plate 5 and the second heat-conducting plate 6 during the downward slide, and will not accumulate due to the obstruction of the contact surface. After heat exchange, the gas temperature decreases, but some heat remains. It is then drawn into the fan 17 through the second gas pipe 10 and sent back to the heating box 16. The heating device in the heating box 16 reheats the gas according to real-time temperature feedback until it reaches the required drying temperature, and then it re-enters the drying machine 1 to participate in the cycle. During the use of the fan 17 and the heating box 16, an external power supply needs to be connected and started through the corresponding controller. The heating device in the heating box 16 monitors the gas temperature entering the heating box in real time through a temperature sensor, converts the temperature signal into an electrical signal and transmits it to the control system. The control system compares the received temperature value with the preset drying temperature. When the gas temperature is lower than the preset value, it automatically adjusts the power of the heating device (such as turning on the number of electric heating tubes or increasing the current) to reheat until the gas temperature reaches the set range, thereby realizing the cyclical control of the gas temperature and ensuring the stability of the gas temperature entering the drying machine 1.

[0024] When maintenance is required, disassembling the sealing plate 11 can simultaneously clean the dust accumulated on the surface of the baffle plate 13 and the impurities intercepted by the filter plate 15, ensuring unobstructed airflow path and efficient heat exchange.

[0025] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A waste heat recovery device for a feed dryer, comprising a dryer body (1), characterized in that: The upper part of the dryer body (1) is equipped with a top plate (2), and a feeding hopper (3) is fixed through the front end of the top plate (2). A heat preservation box (4) is fixed on the top plate (2). The front end of the heat preservation box (4) surrounds the bottom of the feeding hopper (3). Multiple first heat-conducting plates (5) are fixed at the front end and the rear end of the feeding hopper (3). The first heat-conducting plates (5) all penetrate the feeding hopper (3) and extend into the heat preservation box (4). Multiple second heat-conducting plates (6) are fixed on both sides of the feeding hopper (3). The second heat-conducting plates (6) all penetrate the feeding hopper (3) and extend into the heat preservation box (4). The exhaust port of the dryer body (1) is connected to a first air supply pipe (9), and the other end of the first air supply pipe (9) is connected to the heat preservation box (4). A heating box (16) is connected to one side of the dryer body (1), and a fan (17) is installed on the heating box (16). The air outlet of the fan (17) is connected to the heating box (16). A second air supply pipe (10) is connected to the front end of the heat preservation box (4), and the other end of the second air supply pipe (10) is connected to the air intake of the fan (17), which is suitable for waste heat recycling.

2. A feed dryer waste heat recovery unit according to claim 1, characterised in that: The portion of the first heat-conducting plate (5) located inside the feed hopper (3) is designated as the first heat-conducting surface (7). The inclination angle of the first heat-conducting surface (7) is adapted to the feed guiding angle of the feed hopper (3), which is suitable for reducing feed obstruction.

3. A feed dryer waste heat recovery unit according to claim 1, characterised in that: The portion of the second heat-conducting plate (6) located inside the feed hopper (3) is designated as the second heat-conducting surface (8). The inclination angle of the second heat-conducting surface (8) is adapted to the feed guiding angle of the feed hopper (3), which is suitable for reducing feed obstruction.

4. A feed dryer waste heat recovery unit according to claim 1, characterised in that: A sealing plate (11) is installed on the heat preservation box (4).

5. A feed dryer waste heat recovery unit according to claim 4, characterised in that, Multiple baffles (13) are fixed at the rear end of the sealing plate (11), and the baffles (13) are located inside the heat preservation box (4).

6. A feed dryer waste heat recovery unit according to claim 4, characterised in that: The front end of the sealing plate (11) is fixed with an installation frame (14) located inside the heat preservation box (4), and a filter plate (15) is installed inside the installation frame (14).

7. A feed dryer waste heat recovery unit according to claim 4, characterised in that: At least two handles (12) are fixed on the sealing plate (11).

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