A solid alternative fuel drying device

Abstract

The present invention relates to the field of energy-saving and environmental protection technology, and aims to solve the problems of low drying efficiency, uneven material drying and poor applicability of existing drying devices, and provides a solid alternative fuel drying device, including an outer warehouse body, on which a total feed port and an air inlet are provided, the total feed port is used to pass materials, the air inlet is used to connect an air inlet duct, a plurality of layers of drying units are provided inside the outer warehouse body, and the drying units of two adjacent layers are connected, the drying units include a receiving platform fixed on the inner wall of the outer warehouse body and a rotating mechanism located above the receiving platform, a total discharge port and a total air outlet are provided at the bottom of the outer warehouse body; the above-mentioned drying device has a simple structure, occupies a small area, is suitable for industrial promotion and use, and is provided with a plurality of layers of drying units inside, which can greatly extend the material drying area, prolong the residence time, make the material drying more uniform, improve the drying effect, improve the material drying efficiency, and is suitable for various solid alternative fuels.

Description

Technical Field

[0001] The invention relates to the technical field of energy conservation and environmental protection, and in particular to a solid alternative fuel drying device. Background Art

[0002] Alternative fuel (AF) is a general term for fuels that can replace traditional fossil fuels. They can be divided into solid, liquid, and gaseous forms. Currently, solid alternative fuels are the most commonly used, such as straw, wood chips, RDF, etc.

[0003] Alternative fuels have the advantage of being low-carbon. The development and utilization of alternative fuels is of great significance to helping my country achieve its "dual carbon" goals, optimizing its energy structure, alleviating the pressure on fossil fuel supply, and reducing harmful gas emissions. At present, my country's alternative fuels generally have the characteristics of high moisture content and low calorific value, resulting in low actual heat utilization. In the prior art, drying devices are often used to dry alternative fuels to increase their calorific value and facilitate subsequent high-value utilization. However, existing drying devices generally have problems such as high investment, large floor space, low drying efficiency, unsatisfactory drying effect, and poor material adaptability. Summary of the invention

[0004] The present invention aims to provide a solid alternative fuel drying device to solve the problems of low drying efficiency, uneven material drying and poor applicability of existing drying devices.

[0005] The present invention is achieved by adopting the following technical solutions:

[0006] The present invention provides a solid alternative fuel drying device, comprising an outer warehouse body, on which a total feed port and an air inlet are provided, the total feed port is used for feeding materials, the air inlet is used for connecting an air inlet duct, the air inlet comprises a main air inlet and a plurality of branch air inlets, the main air inlet is located at the top of the outer warehouse body, and the branch air inlets are located at the side of the outer warehouse body; the air inlet duct comprises a main air inlet duct and a branch air inlet duct, the main air inlet duct is connected to the main air inlet, the branch air inlet duct is spirally wound around the side of the outer warehouse body, and is respectively connected to each of the branch air inlets; a plurality of layers of drying units are provided inside the outer warehouse body, and the drying units of two adjacent layers are connected, the drying units comprise a material receiving platform fixed on the inner wall of the outer warehouse body and a rotating mechanism located above the material receiving platform, and a total feed port and a total air outlet are provided at the bottom of the outer warehouse body.

[0007] During operation, hot air of a certain temperature is sent into the air inlet duct, and the hot air enters the interior of the outer bin from the air inlet. At the same time, the material enters the interior of the outer bin from the main feed port and falls on the material receiving platform. After the rotating mechanism rotates, the material is gradually rotated from the feed port at a certain speed for nearly a circle and enters the drop port of this layer, and then falls on the material receiving platform of the next layer. The hot air introduced from the main air inlet penetrates the material from top to bottom. While the upper layer material is dried, the lower layer material has been preheated and dried. The residual heat in the flue gas can be fully utilized, and the thermal efficiency is high. The hot air introduced from the branch air inlet blows the falling material horizontally to break it up and homogenize it. The present invention adopts the design of multi-layer drying units, so that the material is fully contacted with the hot air and dried, and finally discharged from the main discharge port. The hot air after heat exchange is discharged from the main air outlet.

[0008] The drying device described in the present invention has a simple structure and occupies a small area, and is suitable for industrial promotion and use. It is provided with multi-layer drying units inside, which can greatly extend the material drying area, prolong the residence time, make the material drying more uniform, improve the drying effect, improve the material drying efficiency, and is suitable for various solid alternative fuels.

[0009] As the preferred technical solution:

[0010] The rotating mechanism includes a rotor and a rotating shaft sleeve. The axis of the rotor is fixedly connected to the rotating shaft sleeve. The rotating shaft sleeve is sleeved on the outside of the rotating shaft. The rotating shaft and the rotating shaft sleeve are meshed with each other. The rotating shaft passes through the center of all the material receiving platforms. One end of the rotating shaft is connected to a driving device, and the other end is connected to the bottom of the outer warehouse body.

[0011] As the preferred technical solution:

[0012] The driving device may be a motor.

[0013] As the preferred technical solution:

[0014] The outer contour of the rotor is circular.

[0015] As the preferred technical solution:

[0016] The rotor comprises a plurality of impellers, a cleaning brush is installed below the impellers, and the cleaning brush is located between the rotor and the material receiving platform.

[0017] The cleaning brush is used for cleaning the material receiving platform.

[0018] As the preferred technical solution:

[0019] The vertical gap between the rotor and the material receiving platform is less than 10 mm.

[0020] As the preferred technical solution:

[0021] A material drop opening is provided on the material receiving platform.

[0022] The drop-out opening connects two adjacent material receiving platforms, and the material falls from the drop-out opening on the material receiving platform of the current layer to the material receiving platform of the lower layer. The drop-out opening on the material receiving platform of the current layer serves as the feed opening for the material receiving platform of the next layer.

[0023] As the preferred technical solution:

[0024] The shape of the blanking opening is fan-shaped.

[0025] As the preferred technical solution:

[0026] The shape of the blanking opening is a sector with 1 / 8 of a circle as an arc.

[0027] As the preferred technical solution:

[0028] The material receiving platform adopts a porous drying belt.

[0029] As the preferred technical solution:

[0030] The aperture of the drying belt reaches micrometer level, and has good air permeability, thereby ensuring that hot air can pass through effectively.

[0031] As the preferred technical solution:

[0032] The front end of the air inlet is equipped with an adjusting air valve.

[0033] The regulating air valve can flexibly adjust the valve opening to control the air intake volume.

[0034] As the preferred technical solution:

[0035] Each of the branch air inlets is located at one side of the feed inlet of each layer of the material receiving platform.

[0036] The hot air introduced from the air inlet directly blows the falling materials horizontally, thus breaking them up and homogenizing them.

[0037] As the preferred technical solution:

[0038] The main feed inlet is located at the top of the outer warehouse body.

[0039] As the preferred technical solution:

[0040] The total feed inlet is fan-shaped.

[0041] As the preferred technical solution:

[0042] The other areas of the bottom surface of the outer warehouse body except the main material outlet are the main air outlet.

[0043] As the preferred technical solution:

[0044] The main discharge port is communicated with the air-locking discharge device.

[0045] Used to discharge finished materials.

[0046] As the preferred technical solution:

[0047] The main air outlet is connected to the centrifugal fan.

[0048] Used to extract the gas in the warehouse.

[0049] As the preferred technical solution:

[0050] A limiting plate is installed on the top of the outer warehouse body, and a portion of the limiting plate extends into the outer warehouse body.

[0051] The appropriate material layer height can be flexibly adjusted for different types of materials to improve drying effect and increase drying efficiency.

[0052] As the preferred technical solution:

[0053] The material limiting plate is fixed to the top of the outer warehouse body by bolts.

[0054] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0055] 1. The invention is simple and easy to operate, occupies a small area, and is suitable for industrial promotion and use.

[0056] 2. The present invention is provided with multi-layer drying units, which can greatly extend the material drying area, prolong the residence time, and improve the material drying efficiency.

[0057] 3. The present invention has high heat exchange efficiency. Hot air penetrates the material from top to bottom. While the upper material is dried, the lower material is preheated and dried. The waste heat in the flue gas can be fully utilized, and the thermal efficiency is high.

[0058] 4. The rotation speed and rotation direction of each layer of the present invention are adjustable, and the residence time of different types of materials on each layer can be flexibly adjusted to improve the drying effect and meet the requirements of outlet moisture content.

[0059] 5. The present invention is provided with a material limiting plate, which can flexibly adjust the appropriate material layer height for different types of materials, improve the drying effect, and increase the drying efficiency.

[0060] 6. The material receiving platform of the present invention adopts a porous drying belt, and the aperture of the drying belt reaches the micron level, which is conducive to the passage of hot air and effectively filters dust.

[0061] 7. A cleaning brush is connected below the impeller of the rotor of the present invention, which can clean the material receiving platform below it in all directions, effectively preventing fine particles in the material from clogging the pores of the drying belt of the material receiving platform.

[0062] 8. The hot air introduced from the air inlet of the present invention can directly blow the falling materials horizontally, so that the materials are fully and evenly dispersed, which is beneficial to the drying of the materials.

[0063] 9. Each air inlet of the present invention is equipped with an adjustable air valve, which can flexibly adjust the air intake of each layer according to different types of materials, which is flexible and convenient and saves heat source.

[0064] 10. The material applicability of the present invention is strong. According to different types of materials, the material layer height, residence time, air intake volume, etc. can be flexibly and adaptively adjusted.

[0065] 11. By using the drying device of the present invention, the moisture content of the alternative fuel can be reduced to less than 10%, and the drying efficiency is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 It is a schematic structural diagram of the solid alternative fuel drying device described in the present invention.

[0067] Figure 2 This is a schematic diagram of the internal structure of the solid alternative fuel drying device described in the present invention.

[0068] Icons: 1-outer warehouse body, 2-air inlet duct, 3-main air inlet duct, 4-sub-air inlet duct, 5-main feed port, 6-main air inlet, 7-limiting plate, 8-bolt, 9-first sub-air inlet, 10-second sub-air inlet, 11-third sub-air inlet, 12-fourth sub-air inlet, 13-main feed port, 14-main air outlet, 15-wind-locking unloading device, 16-centrifugal fan, 17-motor, 18-rotating shaft, 19-rotating shaft sleeve, 20-rotor, 21-material receiving platform, 22-cleaning brush, 23-feeding port, 24-adjusting air valve. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0070] Example 1

[0071] like Figure 1 and Figure 2As shown, this embodiment provides a solid alternative fuel drying device, including an outer warehouse body 1, and a main feed port 5 is provided on the top of the outer warehouse body 1, and the material (solid alternative fuel) is passed into the inner part of the outer warehouse body 1 from the main feed port 5 for drying. In this embodiment, the main feed port 5 is fan-shaped.

[0072] The outer warehouse body 1 is provided with an air inlet, which is connected to an air inlet duct 2. The air inlet duct 2 is used to introduce hot air, and the hot air is used to exchange heat with the material to dry the material. The air inlet includes a main air inlet 6 and a plurality of branch air inlets. The main air inlet 6 is located at the top of the outer warehouse body 1, and the branch air inlets are located on the side of the outer warehouse body 1. The air inlet duct 2 includes a main air inlet pipe 3 and a branch air inlet pipe 4. The main air inlet pipe 3 is located at the top of the outer warehouse body 1, and the main air inlet pipe 3 is connected to the main air inlet 6. The branch air inlet pipe 4 is spirally wound around the side of the outer warehouse body 1 and is respectively connected to each of the branch air inlets. The front ends of the main air inlet 6 and the branch air inlets are equipped with regulating air valves 24, which can flexibly adjust the valve opening to control the air intake. In this embodiment, four sub-air inlets are provided on the side of the outer compartment body 1 , namely a first sub-air inlet 9 , a second sub-air inlet 10 , a third sub-air inlet 11 and a fourth sub-air inlet 12 .

[0073] The bottom of the outer warehouse body 1 is provided with a total discharge port 13 and a total air outlet 14. The dried material is discharged from the total discharge port 13, and the hot air after heat exchange is discharged from the total air outlet 14. In this embodiment, the other areas of the bottom surface of the outer warehouse body 1 except the total discharge port 13 are all the total air outlets 14.

[0074] The main discharge port 13 is connected to the air-locking discharge device 15 for discharging the finished product materials. The main air outlet 14 is connected to the centrifugal fan 16 for extracting the gas in the bin.

[0075] A limiting plate 7 is installed on the top of the outer warehouse body 1, and the limiting plate 7 is fixed to the top of the outer warehouse body 1 by bolts 8, and the limiting plate 7 partially extends into the outer warehouse body 1. The appropriate material layer height can be flexibly adjusted for different types of materials to improve the drying effect and the drying efficiency.

[0076] The outer warehouse body 1 is provided with multiple layers of receiving platforms 21. The outer periphery of each layer of the receiving platforms 21 is fixedly connected to the inner wall of the outer warehouse body 1. The receiving platforms 21 use porous drying belts. The apertures on the drying belts are micrometer-level, which have good air permeability and can ensure the effective passage of hot air. Each layer of the receiving platforms 21 is provided with a material drop opening 23, and this range is not covered by the porous drying belt. The material drop openings 23 of two adjacent layers of the receiving platforms 21 are staggered.

[0077] In this embodiment, the shape of the drop opening 23 is a sector with 1 / 8 of a circle as an arc. The drop opening 23 allows two adjacent layers of the receiving platform 21 to be connected, and the material falls from the drop opening 23 on the receiving platform 21 of the current layer to the receiving platform 21 of the lower layer. The drop opening 23 on the receiving platform 21 of the current layer is the feed opening of the receiving platform 21 of the next layer. The drop opening 23 of the receiving platform 21 of the last layer is connected to the main discharge port 13.

[0078] Each of the branch air inlets is located at one side of the feed inlet of each layer of the material receiving platform 21, and the hot air introduced from the branch air inlets directly blows the falling materials horizontally to achieve the effect of breaking up and homogenizing.

[0079] A rotor 20 is arranged above each layer of the material receiving platform 21. The outer contour of the rotor 20 is circular. The rotor 20 includes eight impellers. All the impellers are evenly arranged to divide the rotor 20 into 8 grids. Each grid has an angle of 45°, which is a 1 / 8 circular sector.

[0080] The vertical gap between the rotor 20 and the material receiving platform 21 is 0-10 mm. When there is a gap between the two, a cleaning brush 22 is installed below the impeller, and the cleaning brush 22 is located between the rotor 20 and the material receiving platform 21 for cleaning the material receiving platform 21.

[0081] The rotor 20 is connected to the rotating shaft 18 through the rotating shaft sleeve 19. Specifically, the axis of the rotor 20 is fixedly connected to the rotating shaft sleeve 19, and the rotating shaft sleeve 19 is annularly surrounding the outer side of the rotating shaft 18. The rotating shaft sleeve 19 and the rotating shaft 18 are meshed and connected with each other. The rotating shaft 18 passes through the center of each layer of the receiving platform 21, one end is connected to the bottom of the outer warehouse body 1, and the other end is connected to the motor 17 located at the top of the outer warehouse body 1. Each layer of the rotor 20 is connected to the rotating shaft 18 through its corresponding rotating shaft sleeve 19, and the rotating shaft sleeve 19 is arranged on the outer side of the rotating shaft 18 in the layer area. The speed and rotation direction of each layer of the rotor 20 are adjustable, and the residence time of different types of materials on each layer can be flexibly adjusted to improve the drying effect and meet the requirements of the outlet moisture content.

[0082] The working process of the drying device of the present invention is as follows:

[0083] During operation, hot air of a certain temperature is delivered to the air inlet duct 2, and the regulating air valves 24 of the main air inlet duct 3 and each branch air inlet duct 4 are opened to introduce hot air into the bin. The hot air from the main air inlet duct 3 enters the drying chamber vertically downward from the main air inlet 6, and the hot air from the branch air inlet pipes enters the drying chamber through each branch air inlet.

[0084] The alternative fuel enters the warehouse through the fan-shaped total feed port 5 at the top of the outer warehouse body 1 and falls onto the first-layer receiving platform 21. During the falling process, hot air is blown in from the first sub-air inlet 9 on one side, which can directly blow the falling materials horizontally, breaking them up and homogenizing them, making it convenient for subsequent drying. In addition, since a limiting plate 7 is also provided at the top of the outer warehouse body 1, the limiting plate 7 is fixed to the top of the outer warehouse body 1 by bolts 8, and the height of the limiting plate 7 entering the outer warehouse body 1 is adjusted by bolts 8, thereby controlling the material layer height of the material on the first-layer receiving platform 21, thereby achieving the purpose of controlling the material layer height of the material in the warehouse. For different types of materials, the appropriate material layer height can be flexibly adjusted to greatly improve the material drying effect.

[0085] Since each layer of the rotating shaft sleeve 19 is annularly surrounding the outside of the rotating shaft 18 and is meshed with the rotating shaft 18 in this layer, the axis of each layer of the rotor 20 is fixed to the rotating shaft sleeve 19, and the motor 17 forms a transmission structure through the rotating shaft 18 and the rotating shaft sleeve 19. Therefore, under the drive of the motor 17, the rotating shaft 18 drives the rotating shaft sleeve 19 and then drives the rotor 20 to rotate and perform circular motion.

[0086] Since the rotating shaft sleeve 19 of each layer can adjust the rotation speed and change the rotation direction, the upper and lower layers can be coaxial with different speeds and coaxial with different directions.

[0087] As the material continuously falls from the feed port, the material receiving platform 21 is fixed, and the rotor 20 rotates at a certain speed following the shaft sleeve 19. The material gradually fills up the seven material grids, and the height of the material layer is controlled by the limiting plate 7. Under the manipulation of the rotor 20, the material is gradually rotated from the feed port at a certain speed for nearly a circle and enters the first layer of the drop port 23, and then falls onto the second layer of the material receiving platform 21, repeating the upper layer action.

[0088] Since the material receiving platform 21 adopts a porous drying belt, the aperture of the drying belt reaches the micron level, and the air permeability is good, which can ensure the effective passage of hot air and effectively filter the dust in the smoke. In addition, a cleaning brush 22 is also installed under the impeller of the rotor 20. When the rotor 20 rotates, it can drive the cleaning brush 22 to clean the material receiving platform 21 below in all directions, effectively preventing the fine particles in the material from clogging the pores of the drying belt of the material receiving platform 21.

[0089] During the process of rotating and discharging the material, the hot air from the main air inlet 6 fully contacts the material from top to bottom to complete the material drying. While completing the drying of the upper layer of material, the lower layer of material has been preheated and dried. The lower layer can recycle the hot air after the upper layer of material is dried, which fully saves heat and improves heat exchange efficiency.

[0090] After multiple layers of rotary drying, the material finally falls onto the last layer of the receiving platform 21, and is rotated by the last layer of the rotor 20 to the drop port 23 of this layer. The drop port 23 of the last layer is connected to the main discharge port 13 at the bottom of the outer warehouse body 1. After the material enters the main feed port 5, the finished material is discharged through the air-locking unloading device 15. The hot air is drawn out of the warehouse through the centrifugal fan 16 outside the warehouse along the pipeline through the main air outlet 14 at the bottom of the outer warehouse body 1. Since the other areas of the bottom surface of the outer warehouse body 1 except the main discharge port 13 are all the main air outlets 14, the bottom air outlet area is large, which is conducive to the outflow of hot air.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solid alternative fuel drying device, characterized in that: The outer warehouse body is provided with a main feed port and an air inlet, the main feed port is used for introducing materials, the air inlet is used for connecting an air inlet duct, the air inlet comprises a main air inlet and a plurality of branch air inlets, the main air inlet is located at the top of the outer warehouse body, and the branch air inlets are located at the side of the outer warehouse body; the air inlet duct comprises a main air inlet duct and a branch air inlet duct, the main air inlet duct is connected to the main air inlet, the branch air inlet duct is spirally wound around the side of the outer warehouse body, and is respectively connected to each of the branch air inlets; a plurality of drying units are arranged inside the outer warehouse body, and the drying units of two adjacent layers are connected, the drying units comprise a material receiving platform fixed on the inner wall of the outer warehouse body and a rotating mechanism located above the material receiving platform, and a main discharge port and a main air outlet are arranged at the bottom of the outer warehouse body; Each of the branch air inlets is located on one side of the material inlet of each layer of the material receiving platform; The rotating mechanism includes a rotor and a rotating shaft sleeve, the axis of the rotor is fixedly connected to the rotating shaft sleeve, the rotating shaft sleeve is sleeved on the outside of the rotating shaft, the rotating shaft and the rotating shaft sleeve are meshed and connected with each other, the rotating shaft passes through the center of all the material receiving platforms, one end of the rotating shaft is connected to the driving device, and the other end is connected to the bottom of the outer warehouse body; The rotor includes a plurality of impellers, a cleaning brush is installed below the impeller, and the cleaning brush is located between the rotor and the material receiving platform; A limiting plate is installed on the top of the outer warehouse body, and a portion of the limiting plate extends into the outer warehouse body; The material receiving platform adopts a porous drying belt; A material dropping opening is provided on each material receiving platform, and this range is not covered by the porous drying belt, and the material dropping openings of two adjacent material receiving platforms are staggered; the material dropping opening connects the two adjacent material receiving platforms, and the material falls from the material dropping opening on the material receiving platform on this layer onto the material receiving platform on the lower layer, and the material dropping opening on the material receiving platform on this layer serves as the feeding opening for the material receiving platform on the next layer.

2. The solid alternative fuel drying device according to claim 1, characterized in that: The front end of the air inlet is equipped with an adjusting air valve.

3. The solid alternative fuel drying device according to claim 1, characterized in that: The main discharge port is communicated with the air-locking discharge device.

4. The solid alternative fuel drying device according to claim 1, characterized in that: The main air outlet is connected to the centrifugal fan.

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