An environmentally friendly and energy-saving fly ash drying device

Abstract

The present invention discloses an environmentally friendly and energy-saving fly ash drying device, which relates to the technical field of fly ash drying. It includes a support frame, a drying module is installed above the support frame, a double-tube screw feeder is installed above the drying module, and a material double-zone mechanism is arranged between the drying module and the double-tube screw feeder. The material double-zone mechanism is used for targeted dual-zone treatment of the conveyed fly ash material, thereby realizing energy-saving recycling. Through the spiral rings in the spiral guide ring group and the vertically installed guiding shaft, the hot air is guided to flow vertically downward in a spiral flow trajectory. By this flow mode, not only the upward flow trend of the hot air's thermal characteristics is broken, but also the horizontal hot air flow inside the communicating curved pipe is destroyed vertically by the spiral flow downward, so that the hot air fills the inside of the equipment in a scattered manner. Through the multi-dimensional hot air flow trajectory, the interaction between the hot air and the fly ash material is significantly enhanced, and the heat transfer efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fly ash drying, and specifically relates to an environmentally friendly and energy-saving fly ash drying device. Background Art

[0002] Existing fly ash drying devices are designed specifically for processing fly ash materials after washing. They can ensure that fly ash is evenly heated in a closed environment, effectively capture fine particles generated during the drying process, ensure a clean working environment, meet environmental protection requirements, and are widely used in the field of fly ash resource recycling. They are key equipment for realizing efficient and environmentally friendly treatment of fly ash.

[0003] However, the existing technology still has the following defects in specific use: 1. Compared with the existing technology, after screening the fly ash, a series of additional treatments are required for the caked fly ash to return to the drying process. Each treatment step requires corresponding equipment, manpower, and time investment, which will increase the equipment purchase cost and maintenance cost. Moreover, the increase in treatment links also means a longer overall production cycle, thus reducing production efficiency. In addition, the caked fly ash goes through a series of treatments and then returns to the drying process, which means that the caked fly ash needs to be processed multiple times, and each treatment consumes energy, thus causing more energy waste.

[0004] 2. Although the existing fly ash dryers are equipped with screw feeders, the screw feeders mainly push the materials forward through the rotation of the screw blades. Their structure is relatively simple, consisting of parts such as a screw shaft, screw blades, and a trough. During normal operation, the screw blades rotate in the trough, pushing the fly ash along the axial direction. The main function of the screw feeder is to convey materials, rather than specifically for crushing caked materials. Although the screw blades will have a certain stirring effect on the materials during rotation, this effect is relatively weak.

[0005] Moreover, if only relying on the hollow shaft and paddle blades inside the dryer to crush the caked fly ash, when the caked fly ash is mixed with the uncaked fly ash, during the rotation and stirring process of the paddle blades, the crushing force is dispersed, which will hinder the uniform transfer of heat, making the dryer take a longer time to complete the drying of the fly ash.

[0006] In addition, since the fly ash also contains hard particles, such as unburned mineral particles, etc., during the stirring process of the paddle blades, the high-hardness particles in the fly ash will continuously rub and collide with the paddle blades and the hollow shaft. Over time, the paddle blades and the hollow shaft will be severely worn or even damaged. For example, scratches will appear on the surface of the paddle blades, reducing the smoothness of the paddle blades, affecting their stirring efficiency, and at the same time, the strength of the paddle blades will be reduced, making them prone to breakage.

[0007] 3. For existing fly ash drying equipment, an important function of introducing external air through the air inlet is to serve as a drying medium. Generally, the introduced external air will enter the interior of the drying equipment after being heated by a heating device. The external air is generally heated to about 100 to 300 degrees, and then enters the drying equipment through the air inlet, enabling the hot air to come into contact with the fly ash material, transfer heat to the fly ash, and evaporate the moisture in the fly ash. However, this method mainly relies on the agitation of the paddles inside the dryer to disperse the hot air. The agitation range and intensity of the paddles are limited, and it is impossible to ensure the uniform distribution of the hot air throughout the interior of the drying equipment. Moreover, due to the upward flow characteristic of the hot air, and the fly ash material presenting different stacking forms and flow states in the drying equipment, this will result in the hot air being unable to continuously and evenly contact the fly ash material, causing the hot air to be directly discharged from the upper part of the equipment, resulting in waste of heat and reduction of the drying effect.

[0008] Therefore, in view of this, the present invention proposes an environmentally friendly and energy-saving fly ash drying device to make up for and improve the deficiencies of the existing technology. Summary of the Invention

[0009] To solve the above technical problems, the present invention provides an environmentally friendly and energy-saving fly ash drying device to solve the technical problems raised in the above background technology.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: an environmentally friendly and energy-saving fly ash drying device, including a support frame, a drying module is installed above the support frame, a double-tube screw feeder is installed above the drying module, and a material double-zone mechanism is arranged between the drying module and the double-tube screw feeder. The material double-zone mechanism is used for targeted dual-zone treatment of the conveyed fly ash material, thereby realizing energy-saving circulation.

[0011] Further, the material double-zone mechanism includes a feed bin connected to the output end of the double-tube screw feeder. A middle partition is installed on the inner wall of the feed bin. Threaded sleeve shafts are symmetrically installed on the side wall of the middle partition. The side wall of the feed bin is movably connected with a hard filter screen through a spring plate frame.

[0012] Further, the threaded sleeve shaft is integrally designed with a hollow structure, the threaded sleeve shaft is kept in communication with the interior of the drying module, and exhaust holes are uniformly arranged on the side of the threaded sleeve shaft close to the hard filter screen.

[0013] Further, the feed bin is integrally in the shape of a parallelogram. The middle partition is fixedly connected to the center position of the inner side wall of the feed bin and divides the interior of the feed bin into left and right two regions.

[0014] Further, the hard filter screen is inclined and installed in the left region inside the feed bin, and the two ends of the hard filter screen are located at the diagonal line and the center point position inside the feed bin from top to bottom in sequence.

[0015] Furthermore, the spring plate frame as a whole is composed of three spring telescopic plates, the spring telescopic plates in the spring plate frame are all kept vertically to the hard filter screen, and a discharge port is opened at the side wall of the feed bin corresponding to the position of the spring plate frame.

[0016] Furthermore, an air inlet duct is connected to the top of the drying module, and a double-cylinder flow-changing mechanism is arranged at the input end of the air inlet duct. The double-cylinder flow-changing mechanism is located as a whole inside the drying module. The double-cylinder flow-changing mechanism is used for the cooperation of the double cylinders to keep the hot air evenly dispersed, thereby improving the drying uniformity. The double-cylinder flow-changing mechanism includes a connecting curved pipe connected to the bottom of the air inlet duct, the outside of the connecting curved pipe is connected to a branch curved pipe, the inner side wall of the branch curved pipe is evenly fixedly connected with a guide plate group, the branch curved pipe is connected to the connecting curved pipe through a converging cylinder, and a spiral guide ring group is installed inside the converging cylinder.

[0017] Furthermore, the branch curved pipe is located directly above the connecting curved pipe, and the radius ratio between the connecting curved pipe and the branch curved pipe is three to two.

[0018] Furthermore, the guide plate group is composed of a combination of no less than seven arc-shaped plates, and circular holes are evenly opened on the surfaces of the arc-shaped plates in the guide plate group. The arc-shaped plates in the guide plate group are all kept at the same height and are directly above the focusing tube.

[0019] Furthermore, the centering cylinder is in the shape of a cone that is wide at the top and narrow at the bottom. The spiral guide ring group includes a spiral ring and a guide shaft. The centering cylinder and the spiral guide ring group are fixedly connected via the spiral ring.

[0020] Furthermore, the double-tube screw feeder is composed of two independent spiral conveying tubes, which are arranged vertically and each spiral tube is independently controlled by a set of motors and reducers to achieve double conveying of materials, and the output end of the upper conveying tube of the double-tube screw feeder is connected to the right area inside the conveying bin, and the output end of the lower conveying tube of the double-tube screw feeder is connected to the left area inside the conveying bin.

[0021] Furthermore, the interior of the drying module is mainly composed of two hollow shafts and blades, and heat medium flows inside the hollow shafts and blades. A heating module is installed on the side wall of the drying module. The heating module includes multiple heat exchangers for heating the drying medium and transporting it to the interior of the hollow shaft inside the drying module through a pipe.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By introducing a feeding bin and a double-screw feeder, the conveying area of this device is divided into left and right sides, thus achieving the effects of material stratification, independent conveying, and targeted treatment. This not only improves the flexibility of material conveying but also effectively solves the problem of mixed treatment of caked fly ash and uncaked fly ash. In this way, the uncaked fly ash can directly enter the device, while the caked fly ash goes through a special path and starts pretreatment during the conveying process, significantly shortening the overall treatment cycle and improving production efficiency. Specifically, through the dynamic action of the hard filter screen and the threaded sleeve shaft on the left side inside the feeding bin, an efficient caking crushing structure is formed. First, the shaking of the hard filter screen effectively impacts and preliminarily separates the hard particles in the caking. The inclination degree of the threaded sleeve shaft continuously increases its contact area with the fly ash, further ensuring that the caked fly ash is fully squeezed and crushed during the conveying process. This not only reduces the burden on the paddle and the hollow shaft during the subsequent drying process but also promotes the uniform distribution of heat, shortens the drying time, and improves the drying efficiency.

[0023] Particularly important is the design of the connection between the inside of the threaded sleeve shaft and the drying module, as well as the exhaust holes opened on it, which can introduce the heat inside the device for recycling, reducing the input demand for external energy. For the uncaked fly ash on the right side, heat recycling can preheat it. When the preheated fly ash enters the device, it already has a certain temperature and can absorb the heat inside the device faster, shortening the drying time. At the same time, for the caked fly ash on the left side, heat recycling preheats it during the dispersion process. On the one hand, it makes the moisture inside the caked fly ash easier to evaporate, and on the other hand, it makes the caked fly ash in a more favorable state for drying before entering the device. After entering the device, it can receive drying treatment more efficiently, thereby reducing the agglomeration of fly ash. Through this preheating method, energy consumption is effectively reduced and energy utilization efficiency is improved.

[0024] At the same time, through the introduction of hot air into the hollow-form threaded sleeve shaft, a heat flow gap is created inside the device, breaking the closed circulation of heat inside the device and enabling the hot air to flow more freely. The enhanced fluidity helps the hot air to be more evenly distributed to all corners of the device, reducing heat accumulation and dead corners, thereby improving the drying efficiency and uniformity. Moreover, the heat flow gap also provides a smooth channel for the continuously input hot air in the future, enabling the new hot air to enter the device more easily, mix with the existing hot air, and jointly act on the fly ash, accelerating the drying process of the fly ash, thereby optimizing the hot air flow and improving the heat utilization rate, reducing the energy consumption during the drying process, making the device require less fuel or power consumption under the same drying effect, and thus reducing the operating cost.

[0025] Moreover, through targeted pretreatment inside the feeding bin, the object to be processed becomes more specific, thereby ensuring effective crushing of the caked fly ash, reducing the direct friction and collision between the paddle blades and the hollow shaft and the high-hardness particles after entering the dryer, significantly reducing the wear rate of the equipment, and extending the service life of the key components. At the same time, the hollow design of the threaded sleeve shaft can also reduce its own load, enhance the structural stability, and further ensure the long-term stable operation of the equipment.

[0026] Compared with the existing technology for transporting and drying fly ash, this device divides the transportation area into two parts, and specifically sets up a second area for centralized dispersion of caked fly ash. This method has a clear goal and can more efficiently process caked fly ash, improving the efficiency of the entire fly ash treatment process. At the same time, it also disperses high-hardness particles through the filter screen plate in the middle of the second area, effectively preventing these high-hardness particles from entering the equipment interior, thereby reducing the wear of the equipment inside.

[0027] (2) In order to solve the problem in the existing technology that hot air cannot continuously and evenly contact the fly ash material, resulting in waste of heat and reduced drying effect, this device introduces and sets up two vertically arranged pipes at the input end of the air inlet: a connecting curved pipe and a branch curved pipe, and the radius ratio between the two is three to two. Combining with the principle of fluid dynamics, the drying effect is significantly improved through the following methods.

[0028] Optimizing the hot air distribution: First, the connecting curved pipe normally penetrates into the equipment to supply air, ensuring the initial distribution of hot air in the horizontal direction. Subsequently, the internal structure of the branch curved pipe, especially the design of the arc plate, ensures that the hot air components flowing into the connecting curved pipe from the branch curved pipe are evenly distributed, helping to eliminate the uneven distribution of hot air in the horizontal direction and increasing the contact area between the hot air and the fly ash material.

[0029] Enhancing the interaction between hot air and fly ash: Secondly, through the spiral rings in the spiral guide ring group and the vertically installed guiding shaft, the hot air is guided to flow vertically downward in a spiral flow trajectory. By this flow method, not only does it break the upward flow trend of the thermal characteristics of the hot air, but it also disrupts the horizontal hot air flow inside the connecting curved pipe through the vertical spiral flow downward, making the hot air fill the equipment interior in a dispersed manner. Through the multi-dimensional hot air flow trajectory, the interaction between the hot air and the fly ash material is significantly enhanced, and the heat transfer efficiency is improved.

[0030] Improve drying efficiency and uniformity: Among them, the shape design of the converging cylinder with a wider upper part and a narrower lower part increases the flow tube rate of the spiral air flow, further promoting the uniform distribution of hot air inside the drying equipment. This design helps to eliminate the retention and accumulation of hot air inside the equipment, reducing heat waste. At the same time, the uniform distribution of hot air also improves the drying uniformity of fly ash materials, avoiding the phenomenon of local over-drying or under-drying.

[0031] Improve equipment performance and reduce energy consumption: Finally, by optimizing the hot air distribution and enhancing the interaction between hot air and fly ash, the equipment can handle more fly ash materials within the same drying time, and the drying effect is more uniform. In addition, due to the improved utilization rate of hot air, the energy consumption is correspondingly reduced, thus achieving the goal of energy conservation and emission reduction. Brief Description of the Drawings

[0032] Figure 1 It is a front view three-dimensional structure schematic diagram of the present invention.

[0033] Figure 2 It is a side view three-dimensional structure schematic diagram of the present invention.

[0034] Figure 3 It is a three-dimensional structure schematic diagram of the material double-zone mechanism of the present invention.

[0035] Figure 4 It is a schematic diagram of the internal planar structure of the material feeding bin of the present invention.

[0036] Figure 5 It is an exploded view of the material double-zone mechanism of the present invention.

[0037] Figure 6 For the present invention Figure 5 The partial enlarged three-dimensional structure schematic diagram at position A in the present invention.

[0038] Figure 7 It is a three-dimensional structure schematic diagram of the interior of the drying module of the present invention.

[0039] Figure 8 It is a three-dimensional structure schematic diagram of the double-cylinder flow-changing mechanism of the present invention.

[0040] Figure 9 It is a three-dimensional structure schematic diagram of the interior of the connecting curved pipe and the branch curved pipe of the present invention.

[0041] Figure 10 It is a three-dimensional structure schematic diagram of the interior of the converging cylinder of the present invention.

[0042] The numbers in the figure are: 1. Support frame; 11. Drying module; 12. Heating module; 13. Double-tube screw feeder; 14. Air inlet duct; 2. Material dual-zone mechanism; 21. Feed bin; 22. Middle partition; 23. Threaded sleeve; 24. Hard filter; 25. Spring plate frame; 3. Double-tube flow-changing mechanism; 31. Connecting curved pipe; 32. Branch curved pipe; 33. Guide plate group; 34. Center cylinder; 35. Spiral guide ring group. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that the structures and working principles of the above-mentioned supporting frame 1, drying module 11, heating module 12, double-tube screw feeder 13, air inlet duct 14 and other components belong to the prior art and will not be repeated here.

[0045] Example 1: Please refer to Figure 1 and Figure 2 As shown, an environmentally friendly and energy-saving fly ash drying device includes a supporting frame 1, a drying module 11 is installed above the supporting frame 1, a double-tube screw feeder 13 is installed above the drying module 11, and a material dual-zone mechanism 2 is arranged between the drying module 11 and the double-tube screw feeder 13. The material dual-zone mechanism 2 is used for dual-zone targeted processing of the transported fly ash material, thereby realizing energy-saving circulation.

[0046] It should be noted that the double-tube screw feeder 13 is composed of two independent spiral conveying pipes, which are arranged vertically, and each spiral tube has its own motor and reducer that can be independently controlled to achieve dual conveying of materials. The output end of the upper conveying pipe of the double-tube screw feeder 13 is connected to the right area inside the feed bin 21, and the output end of the lower conveying pipe of the double-tube screw feeder 13 is connected to the left area inside the feed bin 21. The interior of the drying module 11 is mainly composed of two hollow shafts and paddles, and heat medium is passed through the hollow shafts and paddles. A heating module 12 is installed on the side wall of the drying module 11. The heating module 12 includes multiple heat exchangers for heating the drying medium and conveying it to the inside of the hollow shaft inside the drying module 11 through a pipeline.

[0047] Please refer to Figures 2 to 6As shown in the figure, the material double-zone mechanism 2 includes a material conveying bin 21 connected to the output end of the double-tube screw feeder 13. A middle partition plate 22 is installed on the inner wall of the material conveying bin 21. Threaded sleeve shafts 23 are symmetrically installed on the side wall of the middle partition plate 22. The side wall of the material conveying bin 21 is movably connected with a hard filter screen 24 through a spring plate frame 25.

[0048] It should be noted that the material conveying bin 21 is integrally in the shape of a parallelogram. The middle partition plate 22 is fixedly connected to the center position of the inner side wall of the material conveying bin 21 and divides the interior of the material conveying bin 21 into left and right two regions. The hard filter screen 24 is obliquely installed in the left region inside the material conveying bin 21, and both ends of the hard filter screen 24 are located at the diagonal line and the center point position inside the material conveying bin 21 from top to bottom in sequence. The spring plate frame 25 is integrally composed of three spring telescopic plates. The spring telescopic plates in the spring plate frame 25 are all perpendicular to the hard filter screen 24, and a discharge port is provided at the position of the side wall of the material conveying bin 21 corresponding to the spring plate frame 25.

[0049] Specifically, as Figure 3 and Figure 4 shown in the figure, the output end of the upper conveying pipe of the double-tube screw feeder 13 is connected to the right region inside the material conveying bin 21, and the output end of the lower conveying pipe of the double-tube screw feeder 13 is connected to the left region inside the material conveying bin 21. Therefore, when conveying materials into the equipment through the double-tube screw feeder 13, the specific conveying method is that the unagglomerated fly ash materials are conveyed from the right region in the material conveying bin 21, and the agglomerated fly ash materials are conveyed from the left region in the material conveying bin 21. During this process, the unagglomerated fly ash materials can directly slide down along the inclined surface of the middle partition plate 22 into the equipment. While the agglomerated fly ash materials need to continuously contact with the hard filter screen 24 and the threaded sleeve shafts 23 during the conveying process. At this time, with the continuous shaking of the hard filter screen 24, the agglomerated fly ash is impacted, and the hard particles inside the fly ash are initially separated. And as the agglomerated fly ash is continuously conveyed, the contact area between itself and the threaded sleeve shafts 23 will become larger and larger, and then it will fully contact the threads outside the threaded sleeve shafts 23, so that itself is further crushed. Through the dynamic action of the threaded sleeve shafts 23 and the hard filter screen 24 in the left region inside the material conveying bin 21, an efficient agglomerate crushing structure is formed, thereby ensuring that the agglomerated fly ash is effectively crushed, reducing the direct friction and collision between the paddle and the hollow shaft and the high-hardness particles after entering the drying module 11, significantly reducing the wear rate of the equipment, and extending the service life of the key components.

[0050] It should be noted that the threaded sleeve shafts 23 are integrally designed with a hollow structure, the threaded sleeve shafts 23 are in communication with the inside of the drying module 11, and exhaust holes are uniformly provided on the side of the threaded sleeve shafts 23 close to the hard filter screen 24.

[0051] Specifically, the threaded sleeve shaft 23 is integrally designed with a hollow structure. The threaded sleeve shaft 23 is kept in communication with the inside of the drying module 11, and exhaust holes are evenly formed on one side of the threaded sleeve shaft 23 close to the hard filter screen 24. Therefore, when the device is operating normally, the hot air inside the device will continuously flow out through the exhaust holes formed on the outside of the threaded sleeve shaft 23, thereby preheating the inside of the material conveying bin 21 and providing a preheating environment for it. Moreover, this hot air will also act on the surface of the caked fly ash, thereby evaporating the moisture inside it and making it easier to disperse. Through the introduction of hot air in the form of a hollow threaded sleeve shaft 23, a heat flow gap is created inside the device, breaking the closed circulation of the heat inside the device, enabling the hot air to flow more freely. This enhanced fluidity helps the hot air to be more evenly distributed to all corners of the device, reducing heat accumulation and dead corners, thereby improving the drying efficiency and uniformity. Additionally, the heat flow gap also provides a smooth channel for the continuously input hot air subsequently, enabling the new hot air to enter the device more easily, mix with the existing hot air, and jointly act on the fly ash, accelerating the drying process of the fly ash.

[0052] Embodiment 2: On the basis of Embodiment 1, please refer to Figures 7 to 10 As shown, an air inlet pipe 14 is connected above the drying module 11. A double-cylinder flow-changing mechanism 3 is arranged at the input end position of the air inlet pipe 14. The double-cylinder flow-changing mechanism 3 is entirely located inside the drying module 11. The double-cylinder flow-changing mechanism 3 is used to keep the hot air evenly dispersed through double-cylinder cooperation, thereby improving the drying uniformity. The double-cylinder flow-changing mechanism 3 includes a connecting curved pipe 31 connected below the air inlet pipe 14. A branch curved pipe 32 is connected to the outside of the connecting curved pipe 31. Guide plate groups 33 are evenly fixedly connected to the inner side wall of the branch curved pipe 32. The branch curved pipe 32 and the connecting curved pipe 31 are kept in communication through a centralizing cylinder 34. A spiral guide ring group 35 is installed inside the centralizing cylinder 34.

[0053] It should be noted that the branch curved pipe 32 is located directly above the connecting curved pipe 31, and the radius ratio between the connecting curved pipe 31 and the branch curved pipe 32 is three to two. The guide plate group 33 is composed of no less than seven arc-shaped plates combined. Circular holes are evenly formed on the surfaces of the arc-shaped plates in the guide plate group 33. The arc-shaped plates in the guide plate group 33 are all at the same height and are directly opposite to the upper part of the centralizing cylinder 34. The centralizing cylinder 34 is integrally in a conical shape with a wider upper part and a narrower lower part. The spiral guide ring group 35 entirely includes a spiral ring and a guiding shaft. The centralizing cylinder 34 and the spiral guide ring group 35 are fixedly connected through the spiral ring.

[0054] Specifically, when the hot air enters the inner part of the branch curved pipe 32 and impacts the first vertically arranged and uniformly high porous arc-shaped plate, a pressure distribution will be generated on the surface of the arc-shaped plate. Since small holes are evenly distributed on the arc-shaped plate, the hot air will diffuse and redistribute when passing through the small holes. The hot air near the air inlet end flows at a high speed. When it impacts the arc-shaped plate, part of the hot air will be blocked and diffuse around, while the hot air passing through the small holes will flow to the other side of the arc-shaped plate at a relatively uniform speed and pressure. This effect is similar to the preliminary screening and redistribution of fluid by a sieve, which helps to reduce the concentrated flow of the hot air at the air inlet end, starts to adjust the flow rate and pressure distribution of the hot air on the cross-section of the branch curved pipe 32. Moreover, the subsequent porous arc-shaped plates further strengthen this homogenization effect. Each arc-shaped plate rectifies the hot air in a similar way. As the hot air flows in the pipe, after the action of multiple arc-shaped plates, the flow rate and pressure distribution of the hot air on the cross-section of the pipe gradually tend to be uniform, and then the hot air is effectively guided to flow evenly downward to the centralizing cylinder 34 below through this vertically installed and uniformly high porous arc-shaped plate.

[0055] At this time, since the connecting curved pipe 31 normally penetrates into the equipment to supply air, ensuring the preliminary distribution of the hot air in the horizontal direction, and the hot air flowing downward inside the branch curved pipe 32, through the spiral rings in the spiral guide ring group 35 and the vertically installed guiding shaft, the hot air is guided to flow vertically downward in a spiral flow trajectory. By this flow mode, not only the upward flow trend of the hot air's thermal characteristics is broken, but also the horizontal hot air flow inside the connecting curved pipe 31 is destroyed vertically in a spiral manner, so that the hot air fills the equipment in a scattered manner. Through the multi-dimensional hot air flow trajectory, the interaction between the hot air and the fly ash material is significantly enhanced, and the heat transfer efficiency is improved.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly and energy-saving fly ash drying device, comprising a support frame (1), a drying module (11) being installed above the support frame (1), and a double-tube screw feeder (13) being installed above the drying module (11), characterized in that: A material dual-zone mechanism (2) is provided between the drying module (11) and the double-tube screw feeder (13), and the material dual-zone mechanism (2) is used for dual-zone targeted processing of the transported fly ash material, thereby realizing energy-saving circulation; the material dual-zone mechanism (2) comprises a feeding bin (21) connected to the output end of the double-tube screw feeder (13), the inner wall of the feeding bin (21) is provided with a middle partition (22), the side wall of the middle partition (22) is symmetrically provided with a threaded sleeve (23), and the side wall of the feeding bin (21) is movably connected with a hard filter (24) via a spring plate frame (25); the threaded sleeve (23) is of a hollow design as a whole, the threaded sleeve (23) is connected to the inside of the drying module (11), and exhaust holes are evenly provided on a side of the threaded sleeve (23) close to the hard filter (24).

2. The environmentally friendly and energy-saving fly ash drying device according to claim 1 is characterized in that: The feeding bin (21) is in the shape of a parallelogram as a whole, and the middle partition (22) is fixedly connected to the center position of the inner wall of the feeding bin (21) and divides the interior of the feeding bin (21) into two left and right areas.

3. The environmentally friendly and energy-saving fly ash drying device according to claim 1 is characterized in that: The hard filter (24) is installed in an inclined manner in the left area inside the feed bin (21), and the two ends of the hard filter (24) are located at the diagonal line and the center point inside the feed bin (21) from top to bottom.

4. The environmentally friendly and energy-saving fly ash drying device according to claim 1 is characterized in that: The spring plate frame (25) is composed of three spring telescopic plates, the spring telescopic plates in the spring plate frame (25) are all kept in a vertical state with the hard filter screen (24), and a discharge port is opened at the side wall of the feed bin (21) corresponding to the position of the spring plate frame (25).

5. The environmentally friendly and energy-saving fly ash drying device according to claim 1 is characterized in that: The drying module (11) is connected to an air inlet duct (14) at the top, and a double-cylinder flow-changing mechanism (3) is provided at the input end of the air inlet duct (14). The double-cylinder flow-changing mechanism (3) is located as a whole inside the drying module (11). The double-cylinder flow-changing mechanism (3) is used for the double-cylinder cooperation to keep the hot air evenly dispersed, thereby improving the drying uniformity. The double-cylinder flow-changing mechanism (3) comprises a connecting curved pipe (31) connected to the bottom of the air inlet duct (14), the outside of the connecting curved pipe (31) is connected to a branch curved pipe (32), the inner side wall of the branch curved pipe (32) is evenly fixedly connected with a guide plate group (33), the branch curved pipe (32) and the connecting curved pipe (31) are connected through a central converging pipe (34), and the interior of the central converging pipe (34) is provided with a spiral guide ring group (35).

6. The environmentally friendly and energy-saving fly ash drying device according to claim 5 is characterized in that: The branch curved pipe (32) is located directly above the connecting curved pipe (31), and the radius ratio between the connecting curved pipe (31) and the branch curved pipe (32) is three to two.

7. The environmentally friendly and energy-saving fly ash drying device according to claim 5 is characterized in that: The guide plate group (33) is composed of a combination of no less than seven arc-shaped plates, and circular holes are evenly opened on the surfaces of the arc-shaped plates in the guide plate group (33). The arc-shaped plates in the guide plate group (33) are all kept at the same height and are directly above the centering cylinder (34).

8. The environmentally friendly and energy-saving fly ash drying device according to claim 5, characterized in that: The centering cylinder (34) is in the shape of a cone that is wide at the top and narrow at the bottom. The spiral guide ring assembly (35) comprises a spiral ring and a guide shaft. The centering cylinder (34) and the spiral guide ring assembly (35) are fixedly connected via the spiral ring.

9. The environmentally friendly and energy-saving fly ash drying device according to claim 1, characterized in that: The double-tube screw feeder (13) is composed of two independent screw conveying tubes, which are arranged vertically and each of which is independently controlled by a set of motors and reducers to achieve dual conveying of materials. The output end of the upper conveying tube of the double-tube screw feeder (13) is connected to the right area inside the conveying bin (21), and the output end of the lower conveying tube of the double-tube screw feeder (13) is connected to the left area inside the conveying bin (21).

10. The environmentally friendly and energy-saving fly ash drying device according to claim 1, characterized in that: The drying module (11) comprises two hollow shafts and paddles, and heat medium flows through the hollow shafts and paddles. A heating module (12) is installed on the side wall of the drying module (11). The heating module (12) comprises a plurality of heat exchangers for heating the drying medium and transporting the heat medium to the interior of the hollow shaft inside the drying module (11) through a pipeline.

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