Sludge drying treatment device

Abstract

The utility model provides a sludge drying treatment device, which belongs to the technical field of sewage treatment and comprises a heat exchange chamber for drying wet sludge into sludge drying particles, a fluidization air unit for inputting fluidization air into the heat exchange chamber and a heat exchange air unit for inputting heat exchange air into the heat exchange chamber, the fluidization air unit comprises a fluidization air inlet, a fluidization air bellow and a fluidization air cap; the heat exchange air unit comprises a heat exchange air duct, and the heat exchange air duct is arranged on one side of the heat exchange chamber; the system further comprises a control unit, and the control unit is used for adjusting the air volume ratio of the fluidization air unit to the heat exchange air unit according to the air volume data of the fluidization air and the heat exchange air obtained after fluid dynamics simulation prediction is calculated. The sludge drying treatment device disclosed by the utility model can achieve the technical effects of high sludge drying treatment efficiency and low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a sludge drying treatment device. Background Technology

[0002] With the acceleration of urbanization and industrial development, the volume of wastewater treated is constantly increasing, and the amount of sludge produced is also growing. Sludge is an unavoidable byproduct of wastewater treatment, containing large amounts of organic matter, pathogens, heavy metals, and persistent organic pollutants. If not properly treated, it will cause serious environmental pollution.

[0003] Traditional sludge treatment methods mainly include landfill, incineration, composting, and land application. While landfilling is relatively inexpensive, it consumes a large amount of land resources and carries the risk of leakage, potentially leading to groundwater and soil pollution. Incineration, although it can significantly reduce sludge volume, has high investment and operating costs and may produce harmful gases and ash. Composting can convert sludge into organic fertilizer, but the processing cycle is long, and the content of heavy metals and pathogens in the product may not meet safety standards. Land application, while usable as a soil conditioner, may allow pollutants in the sludge to enter the food chain, impacting the ecological environment and human health. Furthermore, existing sludge treatment technologies also have the following drawbacks: low treatment efficiency, high energy consumption, and the potential generation of harmful gases, wastewater, or solid waste during the treatment process, causing secondary pollution.

[0004] Therefore, there is an urgent need for an efficient, environmentally friendly, and economical sludge drying treatment device. Utility Model Content

[0005] The purpose of this invention is to provide a sludge drying treatment device to solve at least one technical problem existing in the prior art.

[0006] This utility model protects a sludge drying treatment device, including a heat exchange chamber for drying wet sludge into sludge dried particles, a fluidizing air unit for supplying fluidizing air to the heat exchange chamber, and a heat exchange air unit for supplying heat exchange air to the heat exchange chamber.

[0007] The fluidizing air unit includes a fluidizing air inlet, a fluidizing air box, and a fluidizing air cap; wherein, the fluidizing air inlet is located on the side of the fluidizing air box, and the fluidizing air is distributed to the fluidizing air cap through the fluidizing air inlet and the fluidizing air box, and the fluidizing air cap blows hot air vertically upward and evenly onto the wet sludge material to be treated from below the heat exchange chamber.

[0008] The heat exchange air unit includes a heat exchange air duct, which is located on one side of the heat exchange chamber;

[0009] It also includes a control unit, which is used to adjust the air volume ratio of the fluidizing air unit and the heat exchange air unit based on the air volume data of the fluidizing air and the heat exchange air obtained after computational fluid dynamics simulation prediction.

[0010] Furthermore, a preferred structure is that a particle upward channel is provided at the top of the heat exchange chamber, and the particle upward channel is connected to the bag filter dust collector.

[0011] Furthermore, a preferred configuration is that the airflow ratio of the fluidizing air to the heat exchange air is 5:5.

[0012] Furthermore, a preferred structure is to provide a first spiral acceleration air duct at the fluidizing air inlet.

[0013] Furthermore, a preferred structure is that the first spiral acceleration air duct includes a spiral-shaped air duct and a fluidizing air inlet located on the side of the air duct; the fluidizing air inlet is aligned with the tangential direction of the air duct.

[0014] Furthermore, a preferred structure is to provide a second spiral acceleration air duct at the heat exchange air duct.

[0015] Furthermore, a preferred configuration is that a fluidizing fan is installed in the fluidizing box.

[0016] Furthermore, a preferred structure is that an ash discharge hole is provided at the bottom of the fluidizing air box.

[0017] Furthermore, a preferred structure is that a support is provided at the bottom of the fluidized bed sludge dryer; the fluidized air box is disposed in the bottom space of the fluidized bed sludge dryer formed by the support.

[0018] Furthermore, a preferred structure is that a heat insulation layer is provided on the outer wall of the heat exchange chamber of the fluidized bed sludge dryer.

[0019] As described above, this utility model discloses a sludge drying treatment device. The wet sludge to be treated is conveyed to the heat exchange chamber of a fluidized bed sludge dryer via a wet sludge screw conveyor. Fluidizing air is distributed to the fluidizing air cap through a fluidizing air inlet and a fluidizing air box. The fluidizing air cap blows hot air vertically upwards and evenly onto the wet sludge to be treated from below the heat exchange chamber, causing the wet sludge to enter a suspended state. Heat exchange air enters the heat exchange chamber through a heat exchange air duct, causing the suspended wet sludge to enter a rotating suspended state, forming a boiling sludge flow layer. The heat exchange air duct is located on one side of the heat exchange chamber. The airflow rates of the fluidizing air and heat exchange air are obtained through computational fluid dynamics simulation. The heat exchange flue gas exchanges heat with the sludge suspension layer to form dried sludge particles. This utility model can improve sludge drying efficiency and reduce energy consumption by adjusting the airflow rates of the fluidizing air and heat exchange air. Attached Figure Description

[0020] Other objects and results of this invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings and the contents of the claims, and with a more complete understanding of this invention.

[0021] In the attached diagram:

[0022] Figure 1 This is a schematic diagram of the sludge drying treatment device according to an embodiment of the present utility model.

[0023] Figure 2 yes Figure 2 A schematic diagram of the structure at point A.

[0024] Figure 3 yes Figure 2 A schematic diagram of the structure at point B.

[0025] Figure 4 This is a schematic diagram of the sludge drying treatment device according to an embodiment of the present utility model.

[0026] The components include: 1. Wet sludge screw conveyor; 2. Fluidizing air inlet; 3. Fluidizing air box; 4. Ash discharge hole; 5. Fluidizing air cap; 6. Heat exchange air duct; 7. Support frame; 8. Heat exchange air box; 9. Heat exchange chamber; 10. Insulation layer; 11. Particle upward air duct; 12. Outlet flange. Detailed Implementation

[0027] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details. In other instances, well-known structures and devices are shown in block diagram form for ease of description of one or more embodiments.

[0028] It should be understood that the terms "horizontal", "vertical", "upper", "lower", "top", "middle", "length", "inner", "bottom", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0029] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between components; 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The various embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] Figures 1-3 The sludge drying treatment device is described in general. Specifically, Figure 1 This is a schematic diagram of the sludge drying treatment device according to an embodiment of the present utility model.

[0032] like Figure 1 As shown, this utility model protects a sludge drying treatment device, including a heat exchange chamber 9 for drying wet sludge into sludge dry granules, a fluidizing air unit for supplying fluidizing air to the heat exchange chamber 9, and a heat exchange air unit for supplying heat exchange air to the heat exchange chamber 9; the fluidizing air unit includes a fluidizing air inlet 2, a fluidizing air box 3, and a fluidizing air cap 5; wherein, the fluidizing air inlet 2 is disposed on the side of the fluidizing air box 3, and the fluidizing air is distributed through the fluidizing air inlet 2 and the fluidizing air box 3. A fluidizing air cap 5 is provided, which blows hot air vertically upwards and evenly onto the wet sludge material to be treated from below the heat exchange chamber 9. The heat exchange air unit includes a heat exchange air duct 6 and a heat exchange air box 8, with the heat exchange air duct 6 located on one side of the heat exchange chamber 9. It also includes a control unit, which adjusts the airflow ratio of the fluidizing air unit and the heat exchange air unit based on the airflow data of the fluidizing air and the heat exchange air obtained after computational fluid dynamics simulation prediction. CFD simulation results can be used to guide the control strategy of the actual sludge drying process, such as adjusting the airflow ratio of fluidizing air and heat exchange air to achieve a more stable and efficient drying process. Preferably, the airflow ratio of the fluidizing air to the heat exchange air is 5:5.

[0033] Specifically, this invention can dry 60% wet sludge into 30% dry sludge. The wet sludge undergoes suspension boiling heat exchange within the dryer, combining radiation, conduction, and convection heat exchange methods. The heat exchange between the gas and solid phases is very thorough and efficient, enabling rapid decomposition of the wet sludge solid particles within a short time. The dust-laden flue gas is then transported under the negative pressure of fluidizing air and a bag filter. The flue gas enters the subsequent bag filter for gas-solid separation along the rising flue. The clean, moist flue gas then proceeds to the next flue gas treatment process. The remaining 30% dry sludge is fed into a boiler for combustion via power equipment, achieving comprehensive resource utilization.

[0034] In other words, the fluidized bed flue gas is divided into two parts: bottom fluidized bed flue gas and middle heat exchange flue gas, in a ratio of approximately 5:5. The bottom fluidized bed flue gas suspends the material, with a temperature of approximately 140℃. The middle heat exchange flue gas has two functions: a. changing the direction of motion of suspended particles from vertical upward to spiral upward, increasing turbulence. b. providing the main heat exchange energy, also at approximately 140℃. In summary, the fluidized bed sludge dryer uses fluidized bed flue gas to suspend wet sludge within the dryer and achieve efficient heat exchange, thus realizing rapid sludge drying. Simultaneously, gas-solid separation and flue gas treatment ensure clean emissions. The dried sludge can be further used for energy recovery, achieving resource recycling.

[0035] Figure 2 and Figure 3 The first and second spiral acceleration air ducts are described in general.

[0036] like Figure 3 As shown, a first spiral accelerating air duct is provided at the fluidizing air inlet 2. The first spiral accelerating air duct includes a spiral-shaped duct and a fluidizing air inlet located on the side of the duct; the fluidizing air inlet is aligned with the tangent direction of the duct. In specific implementations, the spiral-shaped duct can have only one turn or multiple turns. It is sufficient that the fluidizing air inlet is aligned with the tangent direction of the duct.

[0037] like Figure 2 As shown, a second spiral acceleration air duct is provided at the heat exchange air duct. The second spiral acceleration air duct includes a spiral-shaped air duct and a heat exchange air inlet located on the side of the air duct; the heat exchange air inlet is aligned with the tangential direction of the air duct.

[0038] Specifically, the spiral acceleration duct allows the fluidizing air to achieve more uniform and accelerated flow characteristics before entering the heat exchange chamber, resulting in better suspension and mixing of wet sludge. Accelerated and uniform fluidizing air helps improve the heat exchange efficiency between the sludge and hot air, thereby increasing drying efficiency. Uniform fluidizing air reduces wear on the inner walls of the equipment, extending its service life. The spiral acceleration duct can be designed with one or more turns, providing design flexibility and allowing adjustment of the number of turns to achieve optimal results. In the implementation process, CFD simulation in the control system can help analyze and optimize the fluidizing duct design, achieving a more reasonable flow field distribution and improving the overall system performance. By optimizing the flow of fluidizing air, dust dispersion and diffusion can be reduced, minimizing the impact on the environment and operators.

[0039] A support frame 7 is installed at the bottom of the heat exchange chamber of the fluidized bed sludge dryer; the fluidizing air box 3 is located in the bottom space of the fluidized bed sludge dryer formed by the support frame 7. A fluidizing fan is installed in the fluidizing air box 3. A ash discharge hole 4 is provided at the bottom of the fluidizing air box 3. Specifically, the fluidizing air box is located in the bottom space of the fluidized bed sludge dryer formed by the support frame. The fluidizing air box is equipped with a fluidizing fan to generate fluidizing air. An ash discharge hole is provided at the bottom of the fluidizing air box for discharging sludge particles. A fluidizing air cap is installed at the top of the fluidizing air box to prevent wet sludge from leaking into the fluidizing air box. The ash discharge hole at the bottom of the fluidizing air box allows a small amount of leaked sludge particles to be discharged from the dryer. The fluidizing air cap effectively prevents wet sludge from entering the fluidizing air box and protects the fluidizing fan from damage by sludge. The ash discharge hole at the bottom facilitates the cleaning of leaked sludge and helps maintain the cleanliness of the dryer's interior. The fluidizing air box and fluidizing blower design ensure uniform hot air distribution, improving sludge drying efficiency. The ash discharge port design simplifies equipment maintenance, allowing for quick removal of accumulated sludge and reducing the risk of equipment failure. Preventing direct contact between sludge and the blower reduces blower wear and extends its service life. Effective sludge leakage control helps reduce environmental pollution and meets environmental protection requirements.

[0040] Furthermore, an insulation layer 10 is provided on the outer wall of the heat exchange chamber of the fluidized bed sludge dryer. The insulation layer effectively reduces heat loss inside the heat exchange chamber, maintaining the dryer's internal thermal efficiency. Good insulation performance means the equipment can achieve the same drying effect with lower energy consumption, thus saving energy. For operators, the insulation layer reduces the surface temperature of the outer wall, avoiding the risk of burns. It also reduces heat radiation from the equipment to the surrounding environment, improving the working environment. The insulation layer protects the metal outer wall of the heat exchange chamber from high temperatures, extending the equipment's service life. By reducing temperature fluctuations on the outer wall, it reduces thermal stress caused by thermal expansion and contraction, reducing mechanical fatigue. Insulation materials typically have sound-absorbing properties, reducing noise generated during equipment operation. The insulation layer helps maintain temperature stability in the heat exchange chamber, improving the stability of the entire drying system. Due to the extended equipment lifespan and more stable operation, maintenance costs are correspondingly reduced.

[0041] like Figure 4 As shown, this utility model protects a sludge drying treatment device applied to a sludge drying treatment method, the method including steps S110 to S140.

[0042] S110. The wet sludge material to be treated is conveyed to the heat exchange chamber of the fluidized bed sludge dryer by a wet sludge screw conveyor.

[0043] S120. Fluidizing air is distributed to the fluidizing air cap through the fluidizing air inlet and the fluidizing air box. The fluidizing air cap blows hot air vertically upwards and evenly onto the wet sludge to be treated from below the heat exchange chamber, so that the wet sludge enters a suspended state.

[0044] S130. Heat exchange air enters the heat exchange chamber through the heat exchange air duct, causing the suspended wet sludge to enter a rotating suspension state and form a boiling sludge flow layer; wherein, the heat exchange air duct is located on one side of the heat exchange chamber; wherein, the air volume settings of the fluidizing air and the heat exchange air are obtained through computational fluid dynamics simulation prediction.

[0045] S140, The heat exchange flue gas exchanges heat with the sludge suspension layer to form dried sludge particles.

[0046] In summary, this invention utilizes the synergistic effect of the fluidizing air unit and the heat exchange air unit to create a rotating, suspended state of wet sludge within the heat exchange chamber. This accelerates the contact area and heat exchange efficiency between the sludge and hot air, thereby improving the sludge drying efficiency. The fluidizing air cap evenly distributes hot air onto the wet sludge, ensuring sufficient heat exchange across all parts of the sludge and preventing localized overheating or uneven drying. The control unit adjusts the airflow ratio based on computational fluid dynamics (CFD) simulation data, achieving precise control of the fluidizing and heat exchange air, avoiding energy waste and reducing energy consumption. By optimizing the airflow ratio and heat exchange process, the emission of harmful gases and particulate matter is reduced, minimizing environmental impact. The device has a reasonable structural design, simplified operation process, and is easily automated, reducing the complexity and labor intensity of manual operation. This device can flexibly adapt to different sludge drying conditions by adjusting the airflow ratio of the fluidizing and heat exchange air according to different sludge characteristics and treatment requirements.

[0047] As an improvement to this embodiment, the method for predicting the airflow of the fluidized air and the heat exchange air through computational fluid dynamics simulation includes: S131, establishing a physical model of the fluidized bed sludge dryer; establishing a gas-solid two-phase flow model using computational fluid dynamics simulation software, and using a turbulence model to describe the turbulent flow characteristics of the fluid; S132, dividing the physical model of the fluidized bed sludge dryer into meshes, and setting the boundary conditions for the simulation; S133, performing simulation calculations using computational fluid dynamics simulation software and analyzing the simulation results; and optimizing based on the results; S134, predicting the airflow of the fluidized air and the heat exchange air using the optimized computational fluid dynamics simulation model.

[0048] In this embodiment, by connecting the control unit to data from computational fluid dynamics (CFD) simulation software, and using CFD simulation to predict and precisely control the airflow ratio, this invention can effectively improve sludge drying efficiency, reduce energy consumption, and decrease environmental pollution. In practical implementation, computational fluid dynamics (CFD) simulation is a powerful tool that uses numerical methods to solve the governing equations of fluid mechanics in a computer, thereby predicting the flow field. In the application of sludge drying treatment devices, CFD simulation can help optimize the flow field distribution, improve heat exchange efficiency, reduce energy consumption, and improve the sludge drying effect. Besides predicting and precisely controlling the airflow ratio through CFD simulation, the flow field distribution within the drying chamber can be simulated to identify and improve areas of uneven flow. For example, by arranging guide vanes at the drying chamber inlet, the uniformity of air velocity at the mesh belt inlet and the drying chamber outlet can be improved, thereby increasing the heat exchange efficiency between sludge and air. Furthermore, CFD simulation can analyze energy consumption under different operating conditions, helping to optimize the energy efficiency of the drying process, such as reducing energy consumption by adjusting the circulating airflow and bypass rate. Furthermore, CFD simulations can be used to study the impact of different operating parameters on sludge drying efficiency, such as hot air temperature, air velocity, and sludge thickness, as well as the optimal combination of these parameters to achieve the best drying effect and lowest energy consumption. CFD simulations can also be used for the design and evaluation of new sludge drying equipment, predicting equipment performance through simulation and guiding optimized equipment design. Additionally, CFD simulations can assess potential environmental impacts during sludge drying, such as odor diffusion and particulate matter emissions, and propose corresponding control measures.

[0049] In the specific implementation process, a particle upward channel 11 is provided at the top of the heat exchange chamber 9, and the particle upward channel 11 is connected to the bag filter. An outlet flange 12 is provided in the particle upward channel 11. In the sludge drying treatment device, the particle upward channel 11 is a crucial link in conveying the dried sludge particles from the heat exchange chamber 9 upwards to the bag filter. This design helps to effectively separate the sludge particles from the drying air, while reducing dust dispersion and ensuring the continuity and stability of the entire drying process. The bag filter, through its filtration function, effectively captures dust particles generated during the drying process, preventing them from entering the atmosphere with the airflow, thereby reducing environmental pollution. The outlet flange 12, as the connecting component between the particle upward channel 11 and the bag filter, ensures the airtightness between the channel and the dust collector, prevents gas leakage, and ensures the efficient operation of the system.

[0050] In summary, this invention provides a sludge drying treatment device. The wet sludge to be treated is conveyed to the heat exchange chamber of a fluidized bed sludge dryer via a wet sludge screw conveyor. Fluidizing air is distributed to the fluidizing air caps through a fluidizing air inlet and a fluidizing air box. The fluidizing air caps blow hot air vertically upwards and evenly onto the wet sludge to be treated from below the heat exchange chamber, causing the wet sludge to enter a suspended state. Heat exchange air enters the heat exchange chamber through a heat exchange air duct, causing the suspended wet sludge to enter a rotating suspended state, forming a boiling sludge flow layer. The heat exchange air duct is located on one side of the heat exchange chamber. The airflow rates of the fluidizing air and heat exchange air are obtained through computational fluid dynamics simulation. The heat exchange flue gas exchanges heat with the sludge suspension layer to form dried sludge particles. This invention can improve sludge drying efficiency and reduce energy consumption by adjusting the airflow rates of the fluidizing air and heat exchange air.

[0051] However, those skilled in the art should understand that various improvements can be made to the sludge drying treatment device provided by this utility model without departing from the scope of this utility model. Therefore, the scope of protection of this utility model should be determined by the content of the appended claims.

Claims

1. A sludge drying treatment apparatus, characterized by comprising: The heat exchange chamber is used for drying wet sludge material into sludge dried particles, and the fluidization air unit is used for inputting fluidization air into the heat exchange chamber, and the heat exchange air unit is used for inputting heat exchange air into the heat exchange chamber. The fluidization air unit comprises a fluidization air inlet, a fluidization air box and a fluidization air cap; the fluidization air inlet is arranged on the side of the fluidization air box, and the fluidization air is distributed to the fluidization air cap through the fluidization air inlet and the fluidization air box; the fluidization air cap blows the hot air vertically and uniformly upwards from the lower part of the heat exchange chamber to the wet sludge material to be treated; The heat exchange air unit comprises a heat exchange air duct arranged on one side of the heat exchange chamber. The control unit is used for adjusting the air volume ratio of the fluidization air unit and the heat exchange air unit according to the air volume data of the fluidization air and the heat exchange air obtained after the computational fluid dynamics simulation prediction.

2. The sludge dewatering treatment device according to claim 1, characterized by A particle upward channel is arranged on the top of the heat exchange chamber, and the particle upward channel is connected with a bag dust collector.

3. The sludge dewatering treatment device according to claim 1, characterized by The air volume ratio of the fluidization air and the heat exchange air is 5:

5.

4. The sludge dewatering apparatus according to claim 1, wherein A first spiral acceleration air duct is arranged at the fluidization air inlet.

5. The sludge dewatering apparatus according to claim 4, wherein The first spiral acceleration air duct comprises a spiral-shaped air duct and a fluidization air inlet arranged on the side of the air duct; the fluidization air inlet is consistent with the tangent direction of the air duct.

6. The sludge dewatering apparatus according to claim 1, wherein A second spiral acceleration air duct is arranged at the heat exchange air duct.

7. The sludge dewatering apparatus according to claim 1, wherein A fluidization air fan is arranged in the fluidization air box.

8. The sludge dewatering apparatus according to claim 7, wherein An ash discharge hole is arranged at the bottom of the fluidization air box.

9. The sludge dewatering apparatus of claim 8, wherein A support is arranged at the bottom of the fluidized bed sludge dryer; the fluidization air box is arranged in the space formed by the support at the bottom of the fluidized bed sludge dryer.

10. The sludge dewatering apparatus of claim 9, wherein An insulation layer is arranged on the outer wall of the heat exchange chamber of the fluidized bed sludge dryer.

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