Sludge drying apparatus

Abstract

The utility model belongs to environmental protection technical field discloses a kind of sludge drying device, including belt dryer, forming granulator, air distribution plate and circulating fan, belt dryer includes shell and multiple drying beds being set in shell, shell top is equipped with feed inlet and air inlet, bottom is equipped with discharge port and air outlet, multiple drying beds are arranged along vertical direction interval, every drying bed includes driving roller, driven roller and mesh belt, driving roller and driven roller are spaced apart, parallel and rotationally connected in shell along horizontal direction, driving roller and driven roller are common to mesh belt, adjacent mesh belt operating direction is opposite and length staggered arrangement, to make sludge can be from top to bottom in turn through feed inlet, multilayer mesh belt and discharge port;The output end of forming granulator is communicated with feed inlet;Air duct is opened in air distribution plate, for communicating air inlet;Circulating fan is communicated with air outlet by air pipe, configured as driving shell gas flows from top to bottom.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology, and in particular to a sludge drying device. Background Technology

[0002] Industrial production and urban development generate large amounts of different types of sludge, such as municipal sludge, papermaking sludge, printing and dyeing sludge, electroplating sludge, and industrial hazardous waste sludge. These sludges often contain a large amount of water, and if not effectively treated, they will not only occupy a lot of storage space but may also cause serious environmental pollution. Therefore, it is necessary to dry and reduce the volume of these sludges before incineration.

[0003] Currently, existing sludge drying equipment typically uses high-temperature gas to dry sludge, resulting in high drying costs and generating large amounts of dust during the drying process. This not only threatens production safety but also harms the environment and the health of workers, leading to high subsequent gas treatment costs. Meanwhile, the flue gas from most domestic thermal power plants, after passing through bag filters, is usually at a low temperature, making it difficult to utilize directly and effectively, resulting in the waste of a large amount of heat contained within it.

[0004] Therefore, there is an urgent need to develop a sludge drying device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a sludge drying device that reduces dust during the drying process, realizes the recovery and utilization of heat from low-temperature flue gas, reduces sludge drying costs, and improves energy efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A sludge drying apparatus, comprising:

[0008] A belt dryer includes a shell and multiple drying beds disposed within the shell. The top of the shell has a feed inlet and an air inlet, and the bottom has a discharge outlet and an air outlet. The multiple drying beds are arranged at intervals along the vertical direction. Each drying bed includes a drive roller, a driven roller, and a mesh belt. The drive roller and the driven roller are horizontally spaced, parallel, and rotatably connected to the shell. The drive roller and the driven roller together tension the mesh belt. Adjacent mesh belts run in opposite directions and are staggered in length so that sludge can pass through the feed inlet, multiple mesh belts, and discharge outlet sequentially from top to bottom.

[0009] A molding granulator, wherein the output end of the molding granulator is connected to the feed inlet;

[0010] An air distribution panel, wherein an air duct is provided inside the air distribution panel for connecting to the air inlet;

[0011] A circulating fan, which is connected to the air outlet via a duct, is configured to drive the gas inside the housing to flow from top to bottom.

[0012] In some alternative embodiments, the internal ambient temperature range of the housing is 105°C to 130°C.

[0013] In some alternative embodiments, the sludge drying apparatus further includes a mixing mechanism connected to the duct and configured to mix cold air with the flue gas.

[0014] In some optional embodiments, the sludge drying device further includes a temperature detection element for detecting the ambient temperature inside the housing, and the mixing mechanism is communicatively connected to the temperature detection element.

[0015] In some alternative embodiments, the cross-sectional area of ​​the air duct gradually increases toward the air inlet.

[0016] In some alternative embodiments, the sludge drying apparatus further includes a sludge discharge mechanism, the input end of which is connected to the discharge port.

[0017] In some alternative embodiments, the sludge removal mechanism includes a screw conveyor.

[0018] In some alternative embodiments, the sludge drying apparatus further includes a desulfurization tower connected to the outlet of the circulating fan.

[0019] In some alternative embodiments, the thickness of the mesh belt ranges from 15 mm to 45 mm.

[0020] In some alternative embodiments, the housing contains at least three of the drying beds.

[0021] The beneficial effects of this utility model are:

[0022] This utility model provides a sludge drying device, including a belt dryer, a granulator, an air distribution plate, and a circulating fan. The belt dryer includes a shell and multiple drying beds disposed within the shell. The top of the shell has a feed inlet and an air inlet, and the bottom has a discharge outlet and an air outlet. The multiple drying beds are arranged at intervals along the vertical direction. Each drying bed includes a driving roller, a driven roller, and a mesh belt. The driving roller and the driven roller are horizontally spaced, parallel, and rotatably connected to the shell. The driving roller and the driven roller jointly tension the mesh belt. Adjacent mesh belts run in opposite directions and are staggered in length so that the sludge can pass through the feed inlet, multiple mesh belts, and discharge outlet sequentially from top to bottom. The output end of the granulator is connected to the feed inlet. An air duct is provided in the air distribution plate to connect to the air inlet. The circulating fan is connected to the air outlet through an air duct and is configured to drive the gas inside the shell to flow from top to bottom. By employing the sludge drying device of this embodiment, sludge can be dried at low temperature using low-temperature flue gas, effectively preserving the properties of the sludge and thus reducing the amount of dust during the drying process; at the same time, the heat of the low-temperature flue gas is recovered and utilized, thereby reducing the cost of sludge drying and improving energy efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the sludge drying device of this utility model.

[0024] In the picture:

[0025] 1. Belt dryer; 11. Shell; 111. Feed inlet; 112. Air inlet; 113. Discharge port; 114. Air outlet; 12. Drying bed; 121. Drive roller; 122. Driven roller; 123. Mesh belt; 124. Drive mechanism; 2. Molding granulator; 3. Air distribution plate; 4. Circulating fan; 5. Sludge removal mechanism; 6. Desulfurization tower; 7. Air duct. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] like Figure 1 As shown, this embodiment provides a sludge drying device, including a belt dryer 1, a granulator 2, an air distribution plate 3, and a circulating fan 4. The belt dryer 1 includes a housing 11 and multiple drying beds 12 disposed within the housing 11. The top of the housing 11 has a feed inlet 111 and an air inlet 112, and the bottom has a discharge port 113 and an air outlet 114. The multiple drying beds 12 are arranged at intervals along the vertical direction. Each drying bed 12 includes a driving roller 121, a driven roller 122, and a mesh belt 123. The driving roller 121 and the driven roller 122 are horizontally spaced, parallel, and rotatably connected to the housing. 11. The active roller 121 and the driven roller 122 jointly tension the mesh belt 123. The active roller 121 is connected to the output end of the drive mechanism 124 to drive the adjacent mesh belts 123 to run in the opposite direction. The lengths of the adjacent mesh belts 123 are staggered so that the sludge can pass through the feed inlet 111, the multi-layer mesh belts 123 and the discharge port 113 from top to bottom. The output end of the forming granulator 2 is connected to the feed inlet 111. An air duct is opened in the air distribution plate 3 to connect to the air inlet 112. The circulating fan 4 is connected to the air outlet 114 through the air duct 7 and is configured to drive the gas in the housing 11 to flow from top to bottom.

[0031] The forming granulator 2 can process wet sludge with a moisture content of 10% to 90% into uniform granules or strips, and spread them evenly on the top mesh belt 123 through the feed inlet 111. The wet sludge passes through multiple mesh belts 123 from top to bottom. At the same time, low-temperature flue gas enters the shell 11 evenly through the air distribution plate 3. Under the action of the circulating fan 4, it passes through multiple mesh belts 123 from top to bottom, transferring heat to the wet sludge. This allows the moisture in the wet sludge to evaporate and dry quickly on the mesh belts 123, easily reducing the moisture content of the wet sludge to less than 10%.

[0032] By employing the sludge drying device of this embodiment, sludge can be dried at low temperature using low-temperature flue gas, effectively preserving the properties of the sludge and thus reducing the amount of dust during the drying process; at the same time, the heat of the low-temperature flue gas is recovered and utilized, thereby reducing the cost of sludge drying and improving energy efficiency.

[0033] The drive mechanism 124 includes, but is not limited to, an electric motor or a pneumatic motor, which is not limited here.

[0034] In some optional embodiments, the internal ambient temperature of the shell 11 is in the range of 105°C to 130°C, ensuring that the sludge is in a low-temperature drying state, effectively reducing the amount of dust during the drying process, reducing the generation of harmful substances such as dioxins, reducing the volatilization of volatile organic compounds, maintaining the activity of organic matter, avoiding the loss of nutrients, and making it more suitable as a soil conditioner, organic fertilizer raw material or biomass energy.

[0035] In some optional embodiments, the sludge drying device further includes a mixing mechanism connected to the air duct and configured to mix cold air into the flue gas. When the flue gas temperature is greater than 130°C, the mixing mechanism can mix cold air into the flue gas to reduce the temperature of the drying gas, ensuring that the internal ambient temperature of the housing 11 is within the range of 105°C to 130°C, so that the sludge is in a low-temperature drying state.

[0036] In some optional embodiments, the sludge drying device further includes a temperature detection element for detecting the internal ambient temperature of the housing 11. The mixing mechanism is communicatively connected to the temperature detection element. The temperature detection element monitors the ambient temperature inside the housing 11 in real time, providing precise control basis for the mixing mechanism. This helps maintain a stable ambient temperature inside the housing 11, ensuring the consistency of sludge drying quality and upholding the core advantage of low-temperature drying.

[0037] In some optional embodiments, the cross-sectional area of ​​the air duct gradually increases towards the air inlet 112, which can increase the coverage area when the airflow enters the housing 11 and improve the uniformity of gas diffusion; it can reduce the wind speed, adapt to the characteristics of low temperature drying process, avoid the sludge being impacted and generating dust, and enhance the environmental protection advantages.

[0038] In some optional embodiments, the sludge drying apparatus further includes a sludge discharge mechanism 5, the input end of which is connected to the discharge port 113 for conveying the dried sludge to a downstream station for incineration.

[0039] In some alternative embodiments, the sludge discharge mechanism 5 includes a screw conveyor that pushes the sludge along the conveying trough by rotating helical blades, which can effectively overcome the adhesion of the sludge and avoid blockage.

[0040] Alternatively, the sludge discharge mechanism 5 can also be a belt conveyor, which is not limited here.

[0041] In some optional embodiments, the sludge drying device further includes a desulfurization tower 6, which is connected to the outlet of the circulating fan 4. Due to the shelling effect of low-temperature drying, the amount of dust generated during the sludge drying process is minimal. The flue gas mainly carries away the moisture in the sludge, and the small amount of dust will not affect the downstream desulfurization system. The high-humidity flue gas can be directly treated in the desulfurization tower 6 before being discharged.

[0042] In some optional embodiments, the thickness of the mesh belt 123 ranges from 15mm to 45mm, and the flue gas can penetrate the multiple layers of the mesh belt 123 from top to bottom, so that the moisture of the wet sludge can be quickly evaporated and dried on the mesh belt 123.

[0043] In some optional embodiments, the housing 11 is provided with at least three drying beds 12, through which the wet sludge passes in sequence, effectively extending the drying path, extending the drying time, and ensuring thorough drying.

[0044] In addition, wet sludge is extremely sticky in the early stage of drying. If it stays on a single drying bed 12 for too long, it is easy to stick to the surface of the drying bed 12 due to the rapid evaporation of local moisture, which will cause blockage or poor transportation. By setting up at least three drying beds 12 to continuously transport wet sludge, the sludge stays on each drying bed 12 for a shorter time and can be transferred to the next drying bed 12 in time, reducing the accumulation and adhesion on a single drying bed 12.

[0045] Furthermore, the design of multiple drying beds 12 facilitates the setting of different conveying speeds. For example, the two upper drying beds 12 convey slower to ensure surface dehydration, while the bottom drying bed 12 conveys faster to avoid over-drying, which can further reduce the risk of blockage and ensure continuous and stable operation of the equipment.

[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sludge drying device, characterized in that, include: A belt dryer (1) includes a housing (11) and a plurality of drying beds (12) disposed within the housing (11). The housing (11) has a feed inlet (111) and an air inlet (112) at its top, and a discharge outlet (113) and an air outlet (114) at its bottom. The plurality of drying beds (12) are arranged at intervals along a vertical direction. Each drying bed (12) includes a driving roller (121), a driven roller (122), and a mesh belt (…). 123), the active roller (121) and the driven roller (122) are horizontally spaced, parallel and rotatably connected to the housing (11), the active roller (121) and the driven roller (122) together tension the mesh belt (123), the adjacent mesh belts (123) run in opposite directions and are staggered in length, so that the sludge can pass through the feed inlet (111), the multi-layer mesh belt (123) and the discharge port (113) from top to bottom; A molding granulator (2), the output end of which is connected to the feed inlet (111); Air distribution plate (3), the air distribution plate (3) has an air duct inside, which is used to connect the air inlet (112); A circulating fan (4) is connected to the air outlet (114) through a duct (7) and is configured to drive the gas inside the housing (11) to flow from top to bottom.

2. The sludge drying apparatus according to claim 1, characterized in that, The internal ambient temperature range of the shell (11) is 105℃~130℃.

3. The sludge drying apparatus according to claim 2, characterized in that, The sludge drying device also includes a mixing mechanism connected to the air duct and configured to mix cold air with the flue gas.

4. The sludge drying apparatus according to claim 3, characterized in that, The sludge drying device also includes a temperature detection element, which is used to detect the internal ambient temperature of the shell (11), and the mixing mechanism is communicatively connected to the temperature detection element.

5. The sludge drying apparatus according to claim 1, characterized in that, The cross-sectional area of ​​the air duct gradually increases towards the air inlet (112).

6. The sludge drying apparatus according to claim 1, characterized in that, The sludge drying device also includes a sludge discharge mechanism (5), the input end of which is connected to the discharge port (113).

7. The sludge drying apparatus according to claim 6, characterized in that, The sludge removal mechanism (5) includes a screw conveyor.

8. The sludge drying apparatus according to any one of claims 1 to 7, characterized in that, The sludge drying device also includes a desulfurization tower (6), which is connected to the outlet of the circulating fan (4).

9. The sludge drying apparatus according to any one of claims 1 to 7, characterized in that, The thickness of the mesh belt (123) ranges from 15mm to 45mm.

10. The sludge drying apparatus according to any one of claims 1 to 7, characterized in that, The housing (11) contains at least three drying beds (12).

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