An energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device

Abstract

This utility model relates to the field of sludge drying technology and discloses an energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device, including a drying chamber, drying bed surfaces, drive shaft, gears, reducer, impeller, bushing, through hole, keyway, key, blades, bolts, screw holes, through holes, protrusions, recesses, heat medium inlet, sludge inlet, dried sludge outlet, heat medium outlet, and maintenance passage; the drying chamber has multiple layers of drying bed surfaces arranged horizontally from top to bottom, and the sludge inlet is located on the inlet side of the uppermost drying bed surface. This utility model can significantly improve heat exchange efficiency and enhance the drying effect: by setting multiple layers of drying bed surfaces in the drying chamber, and configuring a rotating impeller in each layer, the contact probability between the sludge being dried and the heat medium is greatly increased during the stirring and transportation process, significantly improving heat exchange efficiency. It can dry organic sludge with a moisture content of more than 70% to a moisture content of less than 10%, effectively enhancing the sludge drying effect.

Description

Technical Field

[0001] This utility model relates to the field of sludge drying technology, specifically to an energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device. Background Technology

[0002] The main methods for treating sludge discharged from wastewater treatment plants include landfill, biocomposting, and drying incineration. With increasingly stringent landfill standards, the secondary pollution caused by landfill leachate and the significant land occupation issues have become increasingly prominent, leading to a year-on-year decrease in the proportion of landfill use. Biocomposting, on the other hand, has limited application due to heavy metal pollution in the sludge. In contrast, sludge drying incineration can completely eliminate secondary pollution, greatly conserve land resources, and the incinerator ash can be reused as building materials such as roadbed materials and curb stones. Therefore, sludge drying incineration technology is expected to develop steadily in the future.

[0003] However, the biggest obstacle to the widespread adoption of sludge drying technology is its operating cost. Currently, the cost of treating one ton of sewage sludge with a moisture content of approximately 80% using a domestically operating sludge drying and incineration system is between 300 and 500 yuan. By adopting energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device technology, the heat energy contained in the dried sludge can be reused to the maximum extent, reducing the treatment cost of one ton of sewage sludge with a moisture content of approximately 80% to about 100 yuan.

[0004] Therefore, a practical, energy-saving, and environmentally friendly multi-layer rotary impeller sludge drying device was designed. Utility Model Content

[0005] The purpose of this invention is to provide an energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device, comprising a drying chamber, a drying bed surface, a drive shaft, gears, a reducer, impellers, bushings, through holes, keyways, keys, blades, bolts, screw holes, through holes, protrusions, recesses, a heat medium inlet, a sludge inlet, a dried sludge outlet, a heat medium outlet, and a maintenance passage; the drying chamber has multiple layers of drying bed surfaces arranged horizontally from top to bottom, the sludge inlet is located on the inlet side of the uppermost drying bed surface, and the dried sludge outlet is located on the outlet side of the lowermost drying bed surface; the reducer is connected to the drive shaft through gears, the drive shaft passes through each layer of impellers through the through hole in the center of the impeller, and transmission is achieved through the bushing, keyway, and key; blades are installed on the outer circumference of the impeller through bolts and screw holes, and the drying bed surface is provided with protrusions, recesses, and through holes; the heat medium inlet and the heat medium outlet connect the flow channels between the drying bed surfaces, and the maintenance passage is located on one side of the drying chamber.

[0007] According to the above technical solution, the drive shaft is multiple and interconnected, passing through the through holes of each layer of impeller from top to bottom. It is driven to rotate by a reducer and gears, which drives each layer of impeller to rotate synchronously, so that the sludge is transported from the inlet side of each layer of drying bed to the outlet side and falls into the lower layer of drying bed.

[0008] According to the above technical solution, a fixed bushing is provided inside the through hole of the impeller, and a keyway is provided on the inner wall of the bushing to match the key on the drive shaft, so as to ensure that the impeller rotates synchronously when the drive shaft rotates and avoids relative sliding.

[0009] According to the above technical solution, the blade surface is distributed with through holes, which allow the heat medium to fully contact the sludge during stirring; the blade and impeller are detachably connected by bolts and screw holes, which facilitates replacement and maintenance.

[0010] According to the above technical solution, the convex and concave parts on the drying bed surface are arranged alternately, the height of the convex parts is higher than that of the concave parts, and the through holes penetrate the convex and concave parts, so that the heat medium can flow between the drying bed surface through the flow channels and through holes formed by the convex and concave parts, thereby improving the heat exchange efficiency.

[0011] According to the above technical solution, high-temperature gas or high-temperature steam is introduced into the heat medium inlet, the heat medium flows through the flow channel between the drying bed surfaces, and contacts the sludge stirred by the impeller through the through holes, and the evaporated water is discharged from the heat medium outlet along with the heat medium.

[0012] According to the above technical solution, the sludge inlet is directly opposite the inlet side of the uppermost drying bed, and the dried sludge outlet is located below the outlet side of the lowermost drying bed. The sludge is sequentially conveyed through multiple drying bed surfaces and finally discharged from the dried sludge outlet, and the moisture content can be reduced to below 10%.

[0013] According to the above technical solution, the maintenance channel is connected to the interior of the drying chamber, and the drying bed, drive shaft, impeller, gear, reducer and other components in the drying chamber can be inspected and maintained through the maintenance channel. Moreover, the overall structure of the device is simple and the failure rate is low.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0015] 1. This utility model can significantly improve heat exchange efficiency and enhance drying effect: The device sets up multiple drying beds in the drying chamber, and each layer is equipped with a rotating impeller, which greatly increases the contact probability between the sludge being dried and the heat medium during the stirring and transportation process, significantly improving heat exchange efficiency. It can dry organic sludge with a moisture content of more than 70% to a moisture content of less than 10%, effectively enhancing the sludge drying effect.

[0016] 2. This utility model can significantly reduce processing costs and energy consumption: The device can recover the calorific value of sludge to the maximum extent. Compared with the traditional sludge drying and incineration system, the cost of processing 1 ton of sludge with a moisture content of 80% is 300-500 yuan, which can reduce the processing cost to about 100 yuan / ton. At the same time, energy consumption is reduced by more than 80%, significantly reducing operating costs.

[0017] 3. This utility model is safe and reliable and realizes the resource utilization of sludge: the device has no safety hazards such as easy explosion during the sludge drying process, and the dried sludge can be reprocessed into building materials, such as roadbed materials and curb stones, realizing "turning waste into treasure" and achieving the harmless and resource-based treatment of sludge. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a front cross-sectional view of a multi-layer rotary impeller sludge drying device according to the present invention.

[0020] Figure 2 This is a cross-sectional plan view of a multi-layer rotary impeller sludge drying device of this utility model;

[0021] Figure 3 This is a plan view of the impeller in a multi-layer rotary impeller sludge drying device of this utility model, which is energy-saving and environmentally friendly.

[0022] In the diagram: 1. Drying chamber, 2. Drying bed surface, 3. Drive shaft, 4. Gear, 5. Reducer, 6. Impeller, 7. Shaft sleeve, 8. Through hole, 9. Keyway, 10. Key, 11. Blade, 12. Bolt, 13. Screw hole, 14. Through hole, 15. Protrusion, 16. Recess, 17. Heat medium inlet, 18. Sludge inlet, 19. Dry sludge outlet, 20. Heat medium outlet. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-3This utility model provides a technical solution: an energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device, including a drying chamber 1, drying bed surfaces 2, drive shaft 3, gear 4, reducer 5, impeller 6, bushing 7, through hole 8, keyway 9, key 10, blade 11, bolt 12, screw hole 13, through hole 14, protrusion 15, recess 16, hot medium inlet 17, sludge inlet 18, dried sludge outlet 19, hot medium outlet 20, and maintenance passage; multiple drying bed surfaces 2 are horizontally arranged from top to bottom in the drying chamber 1, with the sludge inlet 18 located on the inlet side of the uppermost drying bed surface 2, and the dried sludge outlet 19 located on the outlet side of the lowermost drying bed surface 2; the reducer 5 is connected to the drive shaft via the gear 4. Shaft 3, the drive shaft 3 passes through the through hole 8 in the center of the impeller 6 and through each layer of impeller 6, and is driven by the shaft sleeve 7, keyway 9 and key 10 to achieve transmission. There are multiple drive shafts 3, which are interconnected and pass through the through hole 8 of each layer of impeller 6 from top to bottom. They are driven to rotate by the reducer 5 and gear 4, which drives each layer of impeller 6 to rotate synchronously, so that the sludge is transported from the inlet side of each layer of drying bed 2 to the outlet side and falls into the lower layer of drying bed 2. Blades 11 are installed on the outer periphery of the impeller 6 by bolts 12 and screw holes 13. The surface of the blade 11 is distributed with through holes 14, which allow the heat medium to fully contact the sludge through the through holes 14 when stirring the sludge. The blades 11 and impeller 6 are detachably connected by bolts 12 and screw holes 13 for easy replacement and maintenance. The impeller 6 is fixed inside the through hole 8 of the 6. The inner wall of the impeller 7 is provided with a keyway 9, which is adapted to the key 10 on the drive shaft 3 to ensure that the impeller 6 rotates synchronously when the drive shaft 3 rotates, and to avoid relative sliding. The drying bed surface 2 is provided with a protrusion 15, a recess 16 and a through hole 14. The hot medium inlet 17 and the hot medium outlet 20 are connected to the flow channel between the drying bed surfaces 2. High temperature gas or high temperature steam is introduced into the hot medium inlet 17. The hot medium flows through the flow channel between the drying bed surfaces 2 and comes into contact with the sludge stirred by the impeller 6 through the through hole 14. The evaporated water is discharged from the hot medium outlet 20 with the hot medium. The maintenance passage is located on one side of the drying chamber 1. The protrusions 15 and recesses 16 on the drying bed surface 2 are arranged alternately. The height of the protrusions 15 is higher than that of the impeller 6. The recess 16 and the through hole 14 penetrate the protrusion 15 and the recess 16, allowing the heat medium to flow between the drying bed surfaces 2 through the flow channel formed by the protrusion 15 and the recess 16 and the through hole 14, thereby improving the heat exchange efficiency. The sludge inlet 18 is directly opposite the inlet side of the uppermost drying bed surface 2, and the dried sludge outlet 19 is located below the outlet side of the lowermost drying bed surface 2. The sludge is sequentially conveyed through multiple drying bed surfaces 2 and finally discharged from the dried sludge outlet 19, reducing the moisture content to below 10%. The maintenance passage is connected to the interior of the drying chamber 1, allowing for the inspection and maintenance of components such as the drying bed surface 2, drive shaft 3, impeller 6, gear 4, and reducer 5 inside the drying chamber 1. The overall structure of the device is simple and has a low failure rate.

[0025] Working principle: After the sludge to be dried enters the drying chamber 1 through the sludge inlet 18, multiple rotating impellers 6 on the drying bed surface 2 are driven by the reducer 5 at the top of the drying device, which drives the drive shaft 3 to rotate through the gear 4. The drive shaft 3 passes through the through hole 8 in the center of each impeller 6 and is driven by the cooperation of the bushing 7, keyway 9 and key 10. This allows the impellers 6 to stir the sludge and transport it from the inlet side of each drying bed surface 2 to the outlet side at the other end, and then into the next drying bed surface 2. During this process, the hot medium enters from the hot medium inlet 17 and forms a hot medium flow channel between the drying bed surfaces 2. High temperature gas and high temperature steam come into full contact with the stirred sludge through the channels formed by the through holes 14, protrusions 15 and concave parts 16 of the drying bed surface 2, evaporating the moisture in the sludge. The moisture is discharged from the hot medium outlet 20 with the hot medium. Finally, the dried sludge is discharged from the dried sludge outlet 19. The entire process can be maintained through the maintenance channel.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device, characterized in that, The system includes a drying chamber (1), a drying bed surface (2), a drive shaft (3), a gear (4), a reducer (5), an impeller (6), a bushing (7), a through hole (8), a keyway (9), a key (10), a blade (11), a bolt (12), a screw hole (13), a through hole (14), a protrusion (15), a recess (16), a heat medium inlet (17), a sludge inlet (18), a dried sludge outlet (19), a heat medium outlet (20), and a maintenance passage. Multiple layers of drying bed surfaces (2) are horizontally arranged from top to bottom within the drying chamber (1). The sludge inlet (18) is located on the inlet side of the uppermost drying bed surface (2). The outlet (19) is located on the bottom drying bed surface (2) at the outlet side; the reducer (5) is connected to the drive shaft (3) through the gear (4), the drive shaft (3) passes through the through hole (8) in the center of the impeller (6) through each layer of impeller (6), and the transmission is achieved through the bushing (7), keyway (9) and key (10); the blades (11) are installed on the outer circumference of the impeller (6) through bolts (12) and screw holes (13), the drying bed surface (2) is provided with protrusions (15), concave parts (16) and through holes (14); the hot medium inlet (17) and the hot medium outlet (20) are connected to the flow channel between the drying bed surfaces (2), and the maintenance channel is located on one side of the drying chamber (1).

2. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The drive shaft (3) consists of multiple shafts that are interconnected and pass through the through holes (8) of each impeller (6) from top to bottom. It is driven to rotate by a reducer (5) and a gear (4), which drives each impeller (6) to rotate synchronously, so that the sludge is transported from the inlet side of each drying bed (2) to the outlet side and falls into the lower drying bed (2).

3. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The impeller (6) has a fixed bushing (7) inside the through hole (8). The inner wall of the bushing (7) is provided with a keyway (9) that matches the key (10) on the drive shaft (3) to ensure that the impeller (6) rotates synchronously when the drive shaft (3) rotates, thus avoiding relative sliding.

4. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The blade (11) has through holes (14) distributed on its surface, which allow the heat medium to come into full contact with the sludge through the through holes (14) when stirring the sludge; the blade (11) and the impeller (6) are detachably connected by bolts (12) and screw holes (13), which facilitates replacement and maintenance.

5. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The convex (15) and concave (16) on the drying bed surface (2) are arranged alternately, with the convex (15) being higher than the concave (16). The through hole (14) passes through the convex (15) and concave (16), allowing the heat medium to flow between the drying bed surface (2) through the flow channel formed by the convex (15) and concave (16) and the through hole (14), thereby improving the heat exchange efficiency.

6. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, High-temperature gas or high-temperature steam is introduced into the heat medium inlet (17). The heat medium flows through the flow channel between the drying bed surfaces (2) and comes into contact with the sludge stirred by the impeller (6) through the through hole (14). The evaporated water is discharged from the heat medium outlet (20) along with the heat medium.

7. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The sludge inlet (18) is directly opposite the inlet side of the uppermost drying bed (2), and the dried sludge outlet (19) is located below the outlet side of the lowermost drying bed (2). The sludge is sequentially conveyed through multiple drying beds (2) and finally discharged from the dried sludge outlet (19), and the moisture content can be reduced to below 10%.

8. The energy-saving and environmentally friendly multi-layer rotary impeller sludge drying device according to claim 1, characterized in that, The maintenance channel is connected to the interior of the drying chamber (1). The drying bed (2), drive shaft (3), impeller (6), gear (4), reducer (5) and other components in the drying chamber (1) can be inspected and maintained through the maintenance channel. The device has a simple overall structure and a low failure rate.

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