Environment-friendly energy-saving fly ash drying device

Abstract

The invention discloses an environment-friendly and energy-saving fly ash drying device, and relates to the technical field of fly ash drying, the environment-friendly and energy-saving fly ash drying device comprises a supporting frame, a drying module is mounted above the supporting frame, a double-pipe spiral feeder is mounted above the drying module, and a material double-area mechanism is arranged between the drying module and the double-pipe spiral feeder; the material double-area mechanism is used for treating conveyed fly ash materials in a double-area targeted mode, then energy-saving circulation is achieved, hot air is guided to vertically flow downwards in a spiral flowing track through a spiral ring in a spiral guide ring set and a vertically-installed guide shaft, the upward flowing tendency of the hot air due to the thermal characteristic is broken through in the flowing mode, and the energy-saving effect is achieved. And horizontal hot air flowing in the communicating curved pipe is destroyed downwards through vertical spiral flowing, so that the hot air is filled in the equipment in a scattered mode, through a multi-dimensional hot air flowing track, the interaction between the hot air and the fly ash material is remarkably enhanced, and the heat transfer efficiency is improved.

Description

Technical Field

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

[0002] The existing fly ash drying device is specially designed for processing fly ash materials after water washing. It can ensure that the fly ash is evenly heated in a closed environment, and effectively capture the fine particles generated during the drying process to ensure a clean working environment and meet environmental protection requirements. It is widely used in the field of fly ash resource recycling and is a key equipment for achieving efficient and environmentally friendly treatment of fly ash.

[0003] However, the prior art still has the following defects when it is used specifically: 1. Compared with the prior art, after the fly ash is screened, an additional series of treatments are required for the agglomerated fly ash before it can return to the drying process, and each treatment step requires corresponding equipment, manpower and time investment, which will increase the equipment purchase cost and maintenance cost. Moreover, the increase in the number of treatment links also means that the entire production cycle becomes longer, thereby reducing production efficiency. In addition, the agglomerated fly ash undergoes a series of treatments and then returns to the drying process, which means that the agglomerated fly ash needs to be treated multiple times, and each treatment consumes energy, which will cause more energy waste.

[0004] 2. Although the existing fly ash dryer is equipped with a spiral feeder, the spiral feeder mainly pushes the material forward by the rotation of the spiral blade. Its structure is relatively simple, consisting of a spiral shaft, a spiral blade, a material trough and other parts. During normal operation, the spiral blade rotates in the material trough to push the fly ash along the axial direction. The main function of the spiral feeder is to transport materials, rather than to crush lumps. Although the spiral blade will have a certain stirring effect on the material during the rotation process, this effect is relatively weak.

[0005] Furthermore, if the fly ash agglomerates are broken up by simply relying on the hollow shaft and paddles inside the dryer, when the agglomerated fly ash is mixed with the unagglomerated fly ash, the paddles' breaking force will be dispersed during the rotating stirring process, which will hinder the uniform transfer of heat and make the dryer take longer to complete the drying of the fly ash.

[0006] In addition, since fly ash also contains particles with higher hardness, such as incompletely burned mineral particles, the high hardness particles in the fly ash will constantly rub and collide with the blades and the hollow shaft during the paddle stirring process. As time goes by, the blades and the hollow shaft will suffer severe wear and even damage. For example, scratches will appear on the surface of the blades, reducing the smoothness of the blades and affecting their stirring efficiency. At the same time, the strength of the blades will be reduced, making them prone to breakage.

[0007] 3. For the existing fly ash drying equipment, an important function of introducing external air through the air inlet is to serve as a drying medium. Usually, the introduced external air will be heated by a heating device and then enter the drying equipment. The external air will generally be heated to about 100 to 300 degrees, and then enter the drying equipment through the air inlet, so that the hot air contacts the fly ash material, transfers the heat to the fly ash, and evaporates the moisture in the fly ash. However, this method mainly relies on the stirring of the paddles inside the dryer to disperse the hot air. The stirring range and strength of the paddles are limited, and it is impossible to ensure that the hot air is evenly distributed throughout the drying equipment. In addition, since the hot air has the characteristic of flowing upward, and the fly ash material will present different stacking forms and flow states in the drying equipment, this will cause the hot air to be unable to continuously and evenly contact the fly ash material, resulting in the hot air being directly discharged from the upper part of the equipment, resulting in heat waste and reduced drying effect.

[0008] 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 prior art. Summary of the invention

[0009] In order 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, comprising a supporting frame, a drying module is installed above the supporting frame, a double-tube screw feeder is installed above the drying module, and a material dual-zone mechanism is arranged between the drying module and the double-tube screw feeder, and the material dual-zone mechanism is used for dual-zone targeted processing of the transported fly ash material, thereby realizing energy-saving circulation.

[0011] Furthermore, the dual-zone material mechanism includes a feed bin connected to the output end of the double-tube screw feeder, the inner wall of the feed bin is installed with a middle partition, the side wall of the middle partition is symmetrically installed with a threaded sleeve, and the side wall of the feed bin is movably connected with a hard filter through a spring plate frame.

[0012] Furthermore, the threaded sleeve is of a hollow design as a whole, the threaded sleeve is connected to the interior of the drying module, and exhaust holes are evenly arranged on one side of the threaded sleeve close to the hard filter.

[0013] Furthermore, the feed bin is in the shape of a parallelogram as a whole, and the middle partition is fixedly connected to the center position of the inner wall of the feed bin and divides the interior of the feed bin into two left and right areas.

[0014] Furthermore, the hard filter is installed in an inclined manner in the left area inside the feed bin, and the two ends of the hard filter are located at the diagonal and center point positions inside the feed bin from top to bottom.

[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) The device introduces a feed bin and a double-tube screw feeder, so that the conveying area is divided into left and right sides, thereby achieving the effects of stratification, independent conveying and targeted treatment of materials, which not only improves the flexibility of material conveying, but also effectively solves the problem of mixed treatment of agglomerated fly ash and unagglomerated fly ash. In this way, unagglomerated fly ash can directly enter the equipment, while agglomerated fly ash passes through a special path and begins pretreatment during the conveying process, which significantly shortens the overall processing cycle and improves production efficiency. Specifically, a high-efficiency agglomeration crushing structure is formed by combining the dynamic action of the hard filter screen and the threaded sleeve shaft on the left side of the feed bin. First, the hard particles in the agglomerate are effectively impacted and preliminarily separated by the shaking of the hard filter screen, while the inclination of the threaded sleeve shaft continuously increases the contact area between itself and the fly ash, further ensuring that the agglomerated fly ash is fully squeezed and crushed during the conveying process. This not only reduces the burden on the paddles and the hollow shaft in the subsequent drying process, but also promotes the uniform distribution of heat, shortens the drying time, and improves the drying efficiency.

[0023] What is particularly important is that the design of the threaded sleeve connecting the inside with the drying module and the exhaust holes opened thereon can introduce heat from the inside of the equipment for recycling, reducing the demand for external energy input. For the unagglomerated fly ash on the right, the heat cycle can preheat it. When the preheated fly ash enters the equipment, it already has a certain temperature and can absorb the heat inside the equipment more quickly, shortening the drying time. At the same time, for the agglomerated fly ash on the left, the heat cycle preheats it during the dispersion process. On the one hand, it makes it easier to evaporate the moisture inside the agglomerated fly ash. On the other hand, it also makes the agglomerated fly ash in a state that is more conducive to drying before entering the equipment. After entering the equipment, it can be dried more efficiently, thereby reducing the agglomeration of the fly ash. This preheating method effectively reduces energy consumption and improves energy utilization.

[0024] At the same time, the hot air is introduced through the hollow threaded sleeve, which creates a heat flow gap inside the equipment, breaking the closed cycle of heat inside the equipment and allowing the hot air to flow more freely. The enhanced fluidity helps the hot air to be more evenly distributed to all corners of the equipment, reducing heat accumulation and dead corners, thereby improving drying efficiency and uniformity. In addition, the heat flow gap also provides a smooth channel for the subsequent continuous input of hot air, allowing new hot air to more easily enter the equipment, mix with the existing hot air and act on the fly ash together, accelerating the drying process of the fly ash, thereby optimizing the hot air flow and improving the heat utilization rate, reducing the energy consumption in the drying process, and making the equipment require less fuel or electricity consumption under the same drying effect, thereby reducing operating costs.

[0025] In addition, targeted pretreatment inside the feed bin makes the treatment object more specific, thereby ensuring that the agglomerated fly ash is effectively broken up, reducing the direct friction and collision between the paddles and 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 key components. At the same time, the hollow design of the threaded sleeve can also reduce its own load, enhance the stability of the structure, and further ensure the long-term stable operation of the equipment.

[0026] Compared with the method of conveying and drying fly ash adopted in the prior art, this device subdivides the conveying area into two, and sets up a second area specifically for concentrated dispersion of agglomerated fly ash. This method has a clear target and can more efficiently process agglomerated fly ash, thereby improving the efficiency of the entire fly ash treatment process. At the same time, the high-hardness particles are dispersed through the filter screen and filter plate in the middle of the second area, which can effectively prevent these high-hardness particles from entering the interior of the equipment, thereby reducing the wear on the internal equipment of the equipment.

[0027] (2) In order to improve the problem in the prior art that hot air cannot continuously and evenly contact the fly ash material, thus causing heat waste and reduced drying effect, the present device introduces 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. In addition, the principle of fluid dynamics is combined to significantly improve the drying effect in the following way.

[0028] Optimize the hot air distribution: First, the connecting curved pipe runs normally to supply air to the inside of the equipment, ensuring the initial distribution of the hot air in the horizontal direction. Then, the structural coordination inside the branch curved pipe, especially the design of the curved plate, ensures that the hot air flowing from the branch curved pipe into the connecting curved pipe is evenly distributed, which helps to eliminate the uneven distribution of hot air in the horizontal direction and increase the contact area between the hot air and the fly ash material.

[0029] Enhance the interaction between hot air and fly ash: Secondly, through the spiral rings in the spiral guide ring group and the vertically installed guide shaft, the hot air is guided to flow vertically downward in a spiral flow trajectory. This flow mode not only breaks the upward flow trend of the hot air thermal characteristics, but also destroys the horizontal hot air flow inside the connecting curved pipe through the vertical spiral flow, so that the hot air is scattered and filled in the interior of the equipment. 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: The design of the central tube, which is wide at the top and narrow at the bottom, increases the flow tube velocity for the spiral airflow, 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 the fly ash material and avoids 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 process more fly ash materials within the same drying time, and the drying effect is more uniform. In addition, since the utilization rate of hot air is improved, energy consumption is correspondingly reduced, thereby achieving the goal of energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the main stereoscopic structure of the present invention.

[0033] Figure 2 It is a side view stereoscopic structural schematic diagram of the present invention.

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

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

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

[0037] Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged three-dimensional structure in the middle.

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

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

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

[0041] Fig.10 It is a schematic diagram of the internal three-dimensional structure of the poly-center 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, the material dual-zone mechanism 2 includes a feed bin 21 connected to the output end of the double-tube screw feeder 13, a middle partition 22 is installed on the inner wall of the feed bin 21, and a threaded sleeve 23 is symmetrically installed on the side wall of the middle partition 22, and a hard filter screen 24 is movably connected to the side wall of the feed bin 21 through a spring plate frame 25.

[0048] It should be noted that the feed bin 21 is a parallelogram as a whole, the middle partition 22 is fixedly connected to the center position of the inner wall of the feed bin 21, and divides the interior of the feed bin 21 into two left and right areas, the hard filter screen 24 is installed in an inclined manner in the left area inside the feed bin 21, and the two ends of the hard filter screen 24 are located at the diagonal and center point positions inside the feed bin 21 from top to bottom, the spring plate frame 25 as a whole is composed of three spring telescopic plates, the spring telescopic plates in the spring plate frame 25 are all in a vertical state with the hard filter screen 24, and a discharge port is opened on the side wall of the feed bin 21 corresponding to the position of the spring plate frame 25.

[0049] Specifically, Figure 3 and Figure 4 As shown, the output end of the conveying pipe above the double-tube screw feeder 13 is connected to the right area inside the feed bin 21, and the output end of the conveying pipe below the double-tube screw feeder 13 is connected to the left area inside the feed bin 21. Therefore, when the double-tube screw feeder 13 is used to convey materials to the inside of the equipment, the specific conveying method is to convey the unagglomerated fly ash materials from the right area in the feed bin 21, and convey the agglomerated fly ash materials from the left area in the feed bin 21. In this process, the unagglomerated fly ash materials can slide directly downward along the inclined surface of the middle partition plate 22 into the inside of the equipment, while the agglomerated fly ash materials need to keep in contact with the hard filter screen 24 and the threaded sleeve shaft 23 during the conveying process. At this time, as the hard filter screen 24 continues to shake, it impacts the agglomerated fly ash and initially separates the hard particles inside the fly ash. As the agglomerated fly ash is continuously transported, the contact area between itself and the threaded sleeve 23 will become larger and larger, and then it will fully contact the threads outside the threaded sleeve 23, so that it is further crushed. Through the dynamic action of the threaded sleeve 23 and the hard filter screen 24 on the left side of the feed bin 21, an efficient agglomeration crushing structure is formed, thereby ensuring that the agglomerated fly ash is effectively crushed, reducing the direct friction and collision between the blades 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 key components.

[0050] It should be noted that the threaded sleeve 23 is hollow in design as a whole, the threaded sleeve 23 is connected to the inside of the drying module 11 , and exhaust holes are evenly opened on one side of the threaded sleeve 23 close to the hard filter 24 .

[0051] Specifically, the threaded sleeve 23 is hollow in design as a whole, the threaded sleeve 23 is connected to the interior of the drying module 11, and exhaust holes are evenly opened on one side of the threaded sleeve 23 close to the hard filter 24. Therefore, when the equipment is operating normally, the hot air inside the equipment will continuously flow out through the exhaust holes opened on the outside of the threaded sleeve 23, thereby preheating the inside of the feed bin 21 and providing it with a preheating environment. The hot air will also act on the surface of the agglomerated fly ash, thereby evaporating the moisture inside it and making it easier to disperse. The hot air introduced through the hollow threaded sleeve 23 creates a heat flow gap for the inside of the equipment, breaking the closed cycle of heat inside the equipment, allowing the hot air to flow more freely. The enhancement of this fluidity helps the hot air to be more evenly distributed to all corners of the equipment, reducing heat accumulation and dead corners, thereby improving the drying efficiency and uniformity. In addition, the heat flow gap also provides a smooth channel for the subsequent continuous input of hot air, allowing the new hot air to more easily enter the inside of the equipment, mix with the existing hot air and act on the fly ash together, thereby accelerating the drying process of the fly ash.

[0052] Example 2: Based on Example 1, please refer to Figures 7 to 10 As shown, the top of the drying module 11 is connected to an air inlet duct 14, and a double-drum flow-changing mechanism 3 is arranged at the input end of the air inlet duct 14. The double-drum flow-changing mechanism 3 is located as a whole inside the drying module 11. The double-drum flow-changing mechanism 3 is used for double-drum cooperation to keep the hot air evenly dispersed, thereby improving the drying uniformity. The double-drum flow-changing mechanism 3 includes 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 is connected to the connecting curved pipe 31 through a focusing cylinder 34, and the inside of the focusing cylinder 34 is installed with a spiral guide ring group 35.

[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 a combination of no less than seven arc-shaped plates. The surfaces of the arc-shaped plates in the guide plate group 33 are evenly provided with circular holes. The arc-shaped plates in the guide plate group 33 are all maintained at the same height and are directly opposite to the top of the focusing cylinder 34. The focusing cylinder 34 is a cone with a wide upper part and a narrow lower part as a whole. The spiral guide ring group 35 includes a spiral ring and a guide shaft as a whole. The focusing cylinder 34 and the spiral guide ring group 35 are fixedly connected by the spiral ring.

[0054] Specifically, when the hot air enters the branch curved pipe 32 and impacts the first vertical and highly consistent porous arc plate, the hot air will generate a pressure distribution on the surface of the arc plate. Since the small holes are evenly distributed on the arc 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 impacting the arc plate, part of the hot air will be blocked and diffused around, while the hot air passing through the small holes will flow to the other side of the arc plate at a relatively uniform speed and pressure. This effect is similar to the preliminary screening and redistribution of the fluid by a sieve, which helps to reduce the concentrated flow of hot air at the air inlet end and begin to adjust the flow rate and pressure distribution of the hot air on the cross-section of the branch curved pipe 32. In addition, the subsequent porous arc plates further enhance this uniformity effect. Each arc plate performs a similar rectification on the hot air. As the hot air flows in the pipeline, after the action of multiple arc plates, the flow rate and pressure distribution of the hot air on the cross-section of the pipeline gradually tend to be uniform, and then the vertically installed and highly consistent porous arc plate effectively guides the hot air to flow evenly to the central tube 34 below.

[0055] At this time, since the connecting curved pipe 31 normally penetrates into the interior of the equipment to supply air, the initial distribution of the hot air in the horizontal direction is ensured, and the hot air flowing downward in the branch curved pipe 32 passes through the spiral ring in the spiral guide ring group 35 and the vertically installed guide shaft, so that the hot air is guided to flow vertically downward in a spiral flow trajectory. This flow mode not only breaks the upward flow trend of the thermal characteristics of the hot air, but also destroys the horizontal hot air flow in the connecting curved pipe 31 through the vertical spiral flow downward, so that the hot air is scattered and fills the interior of the equipment. Through the multi-dimensional hot air flow trajectory, the interaction between the hot air and the fly ash material is significantly enhanced, thereby improving the heat transfer efficiency.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 feed 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 feed bin (21) and divides the interior of the feed 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 is 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.

Images