Sludge drying system

Abstract

According to the sludge drying system provided by the utility model, sludge in the sludge concentration tank is pumped into the stacked screw filter pressing device through the conveying device for filter pressing, and a flocculating agent is automatically added through the dosing device in the pumping process of the conveying device, so that the sludge is flocculent; the sludge subjected to primary filter pressing is conveyed to the low-temperature belt type drying device through the feeding conveying device to be dried at a low temperature, the continuity and stability of the drying process are ensured, finally, the dried sludge is output and packaged through the discharging conveying device, and the sludge treatment in the whole process is efficient and automatic.

Description

Technical Field

[0001] This utility model relates to the field of sludge drying system. Background Technology

[0002] Existing sludge drying rooms typically use plate filter presses for filtration, which is a relatively outdated process. The entire sludge treatment process requires a large amount of manual labor to complete. Furthermore, there is no dedicated pipeline for collecting the filtrate during the sludge treatment process, resulting in backflow of wastewater with a strong odor that flows directly onto the ground and is difficult to collect. The entire set of equipment is basically in an open operation, and the sludge drying effect is not ideal.

[0003] A drying system and sludge drying equipment are disclosed in utility model patent publication number 213865892U, which includes: a first housing with a first air inlet and a first air outlet; a dehumidification drying module including a fan, a cooling unit and a heating unit, wherein the cooling unit is used to dehumidify the gas entering the drying system, the heating unit is used to heat the dehumidified gas, and the cooling unit includes an evaporator; and a heating drying module including a condenser, wherein the condenser is used to exchange heat with a heating medium to dry the material through the heating medium, and the refrigerant pipeline in the evaporator is connected to the refrigerant pipeline in the condenser.

[0004] A utility model patent with publication number 210457923U discloses a sludge drying production line including a drying box. The drying box has forward and reverse motors installed on the top and bottom left and right sides of its rear wall. A conveyor roller is mounted on the front side of the drive shaft of each motor. A conveyor belt is installed on the outer side of the conveyor rollers on the top and bottom of the rear wall of the drying box. A speed-regulating motor is installed on the upper left and right sides of the rear wall of the drying box near the upper end of the conveyor belt. A transmission rod is installed on the front side of the drive shaft of each speed-regulating motor. Multiple sets of evenly arranged blades are welded to the outer side of the transmission rod. A scraper is installed at the end of each blade away from the transmission rod. This utility model, by installing blades, allows the speed-regulating motor to drive the blades on the outer side of the conveyor rod to rotate, thereby limiting the material accumulation height on the conveyor belt, facilitating complete drying of the material. Simultaneously, accelerating the rotation of the blades allows the material to be thrown up, increasing the contact area between the material and the hot air, reducing the drying time required, and making it suitable for widespread promotion and use.

[0005] In actual processing, wastewater generated in various workshops of the factory is transported to the sewage treatment plant through pipelines. After atomization and biochemical treatment at the sewage treatment plant, sludge is produced. Because the sludge after the first treatment at the sewage treatment plant is relatively thin, this part of the sludge is difficult to collect and treat. Neither of the two existing technologies mentioned above can effectively deal with this situation. Utility Model Content

[0006] Therefore, a sludge drying system is needed to solve the problem that in the actual treatment process, wastewater generated in various workshops of the plant is transported to the sewage treatment plant through pipelines. After atomization and biochemical treatment at the sewage treatment plant, sludge is generated. Because the sludge after the first treatment at the sewage treatment plant is relatively thin, this part of the sludge is difficult to collect and treat.

[0007] To achieve the above objectives, this utility model provides a sludge drying system, comprising:

[0008] Sludge thickening tank is used to collect and initially thicken sludge;

[0009] A conveying device, the front end of which is connected to the sludge thickening tank, is used to extract sludge and convey it to the rear end.

[0010] A screw press filter device, the front end of which is connected to the conveying device, is used to filter sludge;

[0011] The dosing device has its outlet connected to the output pipe of the conveying device via a delivery pipeline. It is used to prepare flocculant and add it to the sludge to cause the sludge to flocculate.

[0012] The feeding and conveying device is configured to be adapted to the inlet of the feeding and conveying device, and is used to transport sludge to a high position.

[0013] A low-temperature belt drying device, wherein the inlet is adapted to the outlet of the feeding conveyor device;

[0014] The discharge conveying device is configured to be adapted to the discharge port of the low-temperature belt dryer and the inlet of the discharge conveying device, and is used to transport the sludge to a high position for packaging and sealing.

[0015] Furthermore, the conveying device is a screw pump, a rotary pump, or a plunger pump.

[0016] Furthermore, there are multiple conveying devices.

[0017] Furthermore, it also includes a shaftless screw conveyor for conveying sludge, which is located between the screw press filter and the feeding conveyor or between the low-temperature belt dryer and the discharge conveyor.

[0018] Furthermore, it also includes a dosing pump, the inlet of which is connected to the outlet of the dosing device, and the outlet of which is connected to the inlet of the screw press filter.

[0019] Furthermore, the dosing pump is a screw pump or a diaphragm pump.

[0020] Furthermore, the low-temperature belt drying device includes a housing, a transmission mechanism, a drying belt, multiple external air condensers, and a control mechanism. The housing is provided with an inlet and an outlet. The transmission mechanism drives the upper surface of the drying belt to move from the inlet to the outlet. The control mechanism is electrically connected to the transmission mechanism and the multiple external air condensers respectively.

[0021] Furthermore, a drain pipe is provided at the bottom of the box, and multiple interfaces are arrayed on the drain pipe, with each interface communicating with the box.

[0022] Unlike existing technologies, this new technology uses a conveying device to pump sludge from a sludge thickening tank into a screw press filter press for filtration. During the pumping process, a flocculant is automatically added via a dosing device to make the sludge flocculent. The sludge after preliminary filtration is then conveyed to a low-temperature belt dryer for low-temperature drying via a feeding conveying device, ensuring the continuity and stability of the drying process. Finally, the dried sludge is output and packaged via a discharging conveying device. The entire sludge processing is highly efficient and automated. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a sludge drying system according to a specific embodiment;

[0024] Figure 2 This is a partial structural diagram of a sludge drying system described in a specific embodiment;

[0025] Figure 3 This is a schematic diagram of another part of the structure of a sludge drying system described in a specific embodiment;

[0026] Figure 4 This is a schematic diagram of another part of the structure of a sludge drying system described in a specific embodiment;

[0027] Figure 5 This is a schematic diagram of the structure of a low-temperature belt drying device for a sludge drying system as described in a specific embodiment.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Sludge thickening tank; 20. Conveying device; 30. Screw press filter; 40. Dosing device; 50. Feed conveying device; 60. Low temperature belt drying device; 601. Box body; 602. External air condenser; 603. Control mechanism; 604. Drainage pipe; 70. Discharge conveying device; 81. Dosing pump; 82. Shaftless screw conveyor. Detailed Implementation

[0030] To explain in detail the technical content, structural features, objectives, and effects of the technical solution, the following description is provided in conjunction with specific embodiments and accompanying drawings.

[0031] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0032] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0033] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0034] In this application, 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 actual quantity, hierarchy or order relationship between these entities or operations.

[0035] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0036] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0037] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0038] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0039] Please see Figures 1 to 5 This embodiment provides a sludge drying system, including:

[0040] The sludge thickening tank 10 is used to collect and initially thicken sludge. Sludge with a moisture content of 99% is transported upstream of the thickening tank. Its main function is to settle and thicken the relatively thin sludge from the first stage of wastewater treatment, reducing its moisture content and volume for easier subsequent processing and transportation. The specific structure of the sludge thickening tank includes the tank body, feeding system, and thickening system. The tank body is usually made of corrosion-resistant materials such as fiberglass or stainless steel, and may have internal baffles or packing to increase the contact area and promote full contact between the sludge and the thickener. The feeding system mainly includes feeding pipes, feeding pumps, and feeding control valves, responsible for transporting wastewater to the thickening tank. The thickening system is the core of the thickening tank, including a thickener dosing system and a thickener recovery system. It concentrates pollutants through physical or chemical reactions and treats or recycles the thickened sludge. In some cases, the tank body and platform may be reinforced concrete, while the remaining internal equipment structure is made of steel. The working principle of the sludge thickening tank mainly involves two methods: physical sedimentation and chemical sedimentation. Physical sedimentation utilizes gravity to allow solid particles in water to settle to the bottom of the tank, while chemical sedimentation involves adding flocculants or coagulants to cause solid particles in the water to aggregate or flocculate, forming larger clumps that facilitate sedimentation. Thickening tanks, through the combined effect of these two methods, effectively precipitate solid particles in the water, thereby thickening the sludge.

[0041] A conveying device 20, whose front end is connected to the sludge thickening tank, is used to extract and convey sludge to the rear end. The conveying device 20 can be a screw pump, rotary pump, or plunger pump. Screw pumps, rotary pumps, and plunger pumps are all types of pumps that can be used for sludge conveying, each with its own structural characteristics and working principle, suitable for different working conditions. A screw pump is a positive displacement pump, mainly composed of a stator, rotor, universal joint, drive unit, and frame. Its working principle is that the closed volume cavity formed between the rotor and stator moves axially as the rotor rotates, pushing the sludge from the suction end to the discharge end. The advantages of screw pumps include the ability to convey media with high solids content, uniform flow rate, stable pressure, and good variable displacement adjustment. It is particularly suitable for pumping thickened sludge because it can maintain the sludge properties to the greatest extent, protecting the flocs from damage, thereby achieving the best dewatering effect. Rotary lobe pumps are a type of positive displacement pump, consisting of a rotating rotor and a stationary pump body. They lack suction and discharge valves, changing the working volume through the relative motion between the rotor and the pump body, and discharging the liquid through the squeezing action of the rotating rotor. Advantages of rotary lobe pumps include minimal shearing of the medium, smooth pumping with almost no pulsation, strong particle throughput, and good wear resistance. Plunger pumps are divided into axial and radial plunger pumps. Their working principle involves the reciprocating motion of a plunger within a cylinder, with the volume change generated by this reciprocating motion producing the pump's output. Advantages of plunger pumps include high parameters, high efficiency, long lifespan, convenient variable displacement, and various configurations. They are suitable for applications requiring very high pressure, providing large flow rates and high pressures. Screw pumps, rotary lobe pumps, and plunger pumps each have their own characteristics and advantages; in sludge transport, the appropriate pump type can be selected based on specific operating conditions. Screw pumps and rotary lobe pumps are particularly suitable for pumping concentrated sludge because they can continuously and uniformly transport the medium without turbulence, agitation, pulsation, or shearing phenomena, preserving the sludge properties to the greatest extent possible. Plunger pumps, on the other hand, are more suitable for applications requiring high-pressure delivery due to their high pressure and large flow rate.

[0042] In some embodiments, there are multiple conveying devices 20. By providing multiple conveying devices 20, it is advantageous to use multiple conveying devices 20 to transport sludge, as it allows for maintenance and upkeep without disassembling the conveying devices 20, saving maintenance time and costs.

[0043] The screw press filter 30, connected at its front end to the conveying device 20, is used to filter sludge. The screw press filter 30 can perform preliminary dewatering of the sludge, resulting in a water content of approximately 83%. The screw press filter 30 mainly consists of a screw press body, a drive device, a filtrate tank, and a mixing system. The screw press body is a filter device formed by stacked fixed and moving rings with a spiral shaft passing through it; the front section is a concentration section, and the rear section is a dewatering section. The spiral shaft consists of a shaft and spiral blades, which rotate to push the sludge from the concentration section to the dewatering section. The drive device is the power source of the equipment, generally using a high-performance motor with an IP54 protection rating and an F-class insulation rating. The filtrate tank, welded from plates, is used to collect the filtrate filtered by the screw press body and connects to external equipment. The mixing system is mainly used to thoroughly mix the sludge with chemicals to form flocs, which then enter the screw press body for pressing and dewatering. The working principle of a screw press dewatering machine consists of three parts: concentration, dewatering, and self-cleaning. In the concentration section, as the screw drives the shaft to rotate, multiple fixed and moving plates surrounding the shaft move relative to each other. Under gravity, water is filtered out through the gaps between the moving plates, achieving rapid concentration. In the dewatering section, the concentrated sludge moves forward continuously with the rotation of the screw shaft. Along the direction of the sludge cake outlet, the screw pitch gradually decreases, and the gaps between the rings also gradually decrease, causing the volume of the screw cavity to continuously shrink. Under the action of the back pressure plate at the outlet, the internal pressure gradually increases. Driven by the continuous rotation of the screw shaft, the water in the sludge is squeezed out, and the solids content of the filter cake continuously increases, ultimately achieving continuous sludge dewatering. In the self-cleaning section, the rotation of the screw shaft drives the moving rings to rotate continuously. The equipment relies on the movement between the fixed and moving rings to achieve a continuous self-cleaning process, thus cleverly avoiding the clogging problem commonly found in traditional dewatering machines.

[0044] The dosing device 40, whose outlet is connected to the output pipe of the conveying device 20 via a delivery pipeline, is used to prepare flocculant and add it to the sludge to cause sludge flocculation and thickening. The dosing device 40 typically includes the following components: an intelligent control box, an electromagnetic diaphragm metering pump, a dosing tank (made of PE material), a level switch, a conductivity meter, and a drain valve. The intelligent control box, as the control center of the entire dosing system, coordinates the operation of each component. It uses PLC control to achieve online control of the dosing pump's opening and closing, monitors the remaining amount of reagent in the tank, and issues an alarm signal when the liquid level is low. The electromagnetic diaphragm metering pump is responsible for precisely controlling the dosage of reagent according to the instructions from the intelligent control box. It provides accurate and uniform dosing, is corrosion-resistant, has good sealing properties, is small in size, and has high metering accuracy. The dosage and output pressure can be adjusted as needed. The working principle of the dosing device 40 is as follows: the intelligent control box controls the electromagnetic diaphragm metering pump according to a preset program to draw reagent from the dosing tank and add it to the sludge treatment system. The dosing tank is equipped with a stirring system to keep the reagents uniform and prevent sedimentation. The dosing process can be operated manually or automatically controlled by various electrical appliances and instruments such as a PC, magnetic level gauge, pH meter, stroke controller, and frequency converter, making the dosing device 40 a mechatronic product.

[0045] Furthermore, it also includes a dosing pump 81, the inlet of which is connected to the outlet of the dosing device 40, and the outlet of which is connected to the inlet of the screw press filter 30. The dosing pump 81 is a screw pump or a diaphragm pump. The diaphragm pump mainly consists of a pump body, a compressed gas chamber, a diaphragm, a suction chamber, an outlet chamber, and inlet / outlet valves. The pump body is usually made of cast iron or stainless steel and is responsible for the intake and discharge of liquid. The compressed gas chamber is connected to the pump body, and the internal piston and piston rod are connected to the piston drive device through a pneumatic or electromechanical transmission device. The diaphragm is located between the upper and lower chambers of the pump body and is usually made of corrosion-resistant materials such as rubber or fluoroplastics to ensure the pump's working effect in different liquid environments. The suction chamber is located at the bottom of the pump body and is connected to the pipe for sucking in liquid, and has the function of controlling the inlet and outlet of liquid with an inlet valve. The working principle of the diaphragm pump is to rely on the back-and-forth pulsation of the diaphragm to change the volume of the working chamber to suck in and discharge liquid. In a pneumatic diaphragm pump, compressed air serves as the power source, driving a piston to move the diaphragm up and down, thus drawing in and discharging liquid. An electric diaphragm pump, on the other hand, is driven by an electric motor. The motor, through a gearbox, drives the diaphragm on the plunger to reciprocate, changing the volume within the working chamber and forcing a one-way ball valve to open and close alternately, thereby drawing in and discharging liquid. Diaphragm pumps can precisely transfer liquids, ensuring that sludge reaches the appropriate viscosity.

[0046] It should be noted that the flocculant used in this novel invention is preferably PAM. The main function of adding polyacrylamide (PAM) is as a highly efficient flocculant. It can promote the aggregation of suspended particles into larger flocs through charge neutralization and physical entanglement, thereby accelerating the sedimentation and separation of sludge. The addition of PAM can significantly improve the dewatering performance of sludge, reduce sludge volume, and lower the cost of subsequent treatment and disposal. At the same time, PAM can also improve the effluent quality, remove more suspended solids and turbidity, and is suitable for various water quality conditions and treatment requirements. It has the advantages of strong adaptability, simple operation, and reduced sludge volume.

[0047] The feeding conveying device 50 is configured to be adapted to the discharge port of the screw press filter 30, meaning the discharge port of the screw press filter 30 can be directly positioned above the discharge port of the feeding conveying device 50. Sludge output from the screw press filter 30 can directly fall into the discharge port of the feeding conveying device 50, which is simple and efficient. If space constraints prevent this solution, a shaftless screw conveying device 82 can be installed between the screw press filter 30 and the feeding conveying device 50. The shaftless screw conveying device 82 is a device for conveying sludge, and its main structural components include a drive unit, head assembly, housing, shaftless screw, trough liner, discharge port, cover (if needed), and base. The drive unit typically uses a cycloidal pinwheel reducer or a shaft-mounted hardened gear reducer. During design, the drive unit should be positioned at the discharge port end to ensure the screw is under tension during operation. The head is equipped with a thrust bearing to withstand the axial force generated during material conveying. The casing is U-shaped or O-shaped, with a rainproof cover on top, and is made of stainless steel, carbon steel, or fiberglass. The shaftless screw is made of stainless steel or carbon steel, and the trough liner is made of polymer or manganese steel. The shaftless screw conveyor is driven by a motor that powers a cycloidal reducer, and the screw rotates via a mechanical seal shaft and a connecting disc on the shaftless screw. When sludge is discharged into the feed inlet at the top of the U-shaped trough, it is discharged from the discharge outlet at the bottom of the U-shaped trough through screw drive. During operation, the sludge acts like a stationary nut, while the shaftless screw acts like a rotating bolt; the continuous rotation of the bolt drives the nut from one end to the other. This design makes the shaftless screw conveyor particularly suitable for conveying ribbon-like, viscous, and easily entangled materials because it eliminates the interference of a central shaft, reducing the possibility of material blockage and entanglement. The feeding conveyor 50 is used to transport the sludge to a higher position; the feeding conveyor 50 can be a screw conveyor or a conveyor belt.

[0048] Specifically, the feeding and conveying device 50 can be a scraper conveyor, which is a device that continuously conveys powdery, granular, and small lump materials within a closed casing using a moving scraper chain. Its structure mainly consists of a transmission unit, hydraulic coupling, reducer, sprockets, head frame, and blind shaft. The head transmission unit consists of a head frame, motor, coupling, reducer, and sprocket assembly. Power is transmitted to the sprockets through the reducer, driving the scrapers to form a closed, continuously variable transmission chain. The working principle of the scraper conveyor relies on the internal friction and lateral pressure of the material. During material conveying, the pressure in the direction of scraper chain movement and the pushing force of the lower material on the upper material during continuous feeding are sufficient to overcome the external frictional resistance generated between the material and the casing during conveying in the trough, as well as the weight of the material itself, allowing the material to move forward in a continuous flow. The advantages of scraper conveyors include simple structure, light weight, small size, strong sealing, and convenient installation and maintenance. They can operate stably, reliably, smoothly, and continuously under specified environmental conditions for extended periods, meeting the requirements of various operating conditions, including continuous, intermittent, frequent start-stop, and full-load operation. Furthermore, scraper conveyors feature high rigidity, a sealed casing to prevent material scattering, a good working environment, and solutions to problems related to adhesion, caking, and floating chains.

[0049] The low-temperature belt dryer 60 has its inlet adapted to the outlet of the feeding conveyor 50. This adaptation means the outlet of the feeding conveyor 50 can be directly positioned above the outlet of the feeding conveyor 50, allowing sludge output from the outlet of the feeding conveyor 50 to fall directly into the inlet of the low-temperature belt dryer 60, making it simple and efficient. The low-temperature belt dryer 60 mainly includes a heat pump system (or waste heat heating system, external cooling system), an air circulation device, a sludge forming, holding and conveying device 20, and a drying chamber. Utilizing the Carnot cycle principle and equipped with an air supply system, heat exchange system, etc., it is a new type of energy-saving dryer. Its working principle utilizes low-temperature heat pump technology. A small amount of electricity is consumed to drive a compressor, compressing the medium into a high-temperature, high-pressure gas. This gas then enters a condenser to release heat, which is then transported to the drying chamber by a circulating fan. This heat heats the material, absorbing moisture and causing it to vaporize and exit the material's surface. The material then passes through an evaporator for cooling and dehumidification, removing the remaining moisture and achieving drying. In this process, sludge with a moisture content of 65% to 83% enters through the top feed inlet. After being processed by a granulation or cutting device, it falls onto a 304 stainless steel mesh belt. The belt operates continuously, with hot, dry air introduced from the bottom. The moisture in the sludge absorbs heat and continuously vaporizes, producing a large amount of saturated water vapor that is carried back to the top of the belt. The hot air then circulates back to the evaporator, where the water vapor is collected and discharged through condensation and dehumidification. After drying by the low-temperature belt dryer, the sludge has a moisture content of ≤30%.

[0050] The discharge conveyor 70 is configured to be adapted to the inlet of the low-temperature belt dryer 60. This adaptation means the discharge port of the low-temperature belt dryer 60 can be directly positioned above the inlet of the discharge conveyor 70, allowing sludge from the low-temperature belt dryer 60 to fall directly into the inlet of the discharge conveyor 70 – a simple and efficient solution. If space constraints prevent this, a shaftless screw conveyor 82 can be installed between the screw press filter 30 and the feeding conveyor 50 to facilitate adjustment of their relative positions. This device transports the sludge to a higher position for packaging. Specifically, ton bags can be installed below the discharge port of the discharge conveyor 70 to package the sludge after low-temperature drying, and then transported using forklifts or other tools.

[0051] Wastewater generated from production in various workshops of the factory is transported to the sewage treatment plant through pipelines. After atomization and biochemical treatment at the sewage treatment plant, sludge is produced. Because the sludge is relatively thin after the first treatment at the sewage treatment plant, it needs to be further treated by the sludge drying system described in this new invention in order to facilitate the collection and treatment of the sludge.

[0052] This novel device uses a conveying device 20 to pump sludge from a sludge thickening tank to a screw press filter 30 for filtration. During the pumping process, a flocculant is automatically added by a dosing device 40 to make the sludge flocculent. The sludge after preliminary filtration is then conveyed to a low-temperature belt dryer 60 by a feeding conveying device 50 for low-temperature drying, ensuring the continuity and stability of the drying process. Finally, the dried sludge is output and packaged by a discharging conveying device 70. The entire process of sludge treatment is highly efficient and automated.

[0053] Specifically, the low-temperature belt drying device 60 includes a housing 601, a transmission mechanism, a drying belt, multiple external air condensers 602, and a control mechanism 603. The housing 601 has an inlet and an outlet. The transmission mechanism drives the upper surface of the drying belt to move from the inlet to the outlet. The control mechanism 603 is electrically connected to the transmission mechanism and the multiple external air condensers 602. The control mechanism 603 can be a PC or PLC controller. It features a high degree of automation, a simple process structure, and effectively improves work efficiency.

[0054] Furthermore, a drain pipe 604 is provided below the housing 601, and multiple interfaces are arrayed on the drain pipe 604, each of which is connected to the housing 601. Wastewater is collected through the drain pipe 604 to avoid secondary pollution.

[0055] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection for this utility model. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this utility model, or equivalent structural or procedural transformations made using the content of this utility model's specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this utility model patent.

Claims

1. A sludge drying system, characterized in that, include: Sludge thickening tank is used to collect and initially thicken sludge; A conveying device, the front end of which is connected to the sludge thickening tank, is used to extract sludge and convey it to the rear end. A screw press filter device, the front end of which is connected to the conveying device, is used to filter sludge; The dosing device has its outlet connected to the output pipe of the conveying device via a delivery pipeline. It is used to prepare flocculant and add it to the sludge to cause the sludge to flocculate. The feeding and conveying device is configured to be adapted to the inlet of the feeding and conveying device, and is used to transport sludge to a high position. A low-temperature belt drying device, wherein the inlet is adapted to the outlet of the feeding conveyor device; The discharge conveying device is configured to be adapted to the discharge port of the low-temperature belt dryer and the inlet of the discharge conveying device, and is used to transport the sludge to a high position for packaging and sealing.

2. The sludge drying system according to claim 1, characterized in that: The conveying device is a screw pump, a rotor pump, or a plunger pump.

3. The sludge drying system according to claim 2, characterized in that: There are multiple conveying devices.

4. The sludge drying system according to claim 1, characterized in that: It also includes a shaftless screw conveyor for conveying sludge, which is located between the screw press filter and the feeding conveyor or between the low-temperature belt dryer and the discharge conveyor.

5. A sludge drying system according to claim 1, characterized in that: It also includes a dosing pump, the inlet of which is connected to the outlet of the dosing device, and the outlet of which is connected to the inlet of the screw press filter.

6. A sludge drying system according to claim 5, characterized in that: The dosing pump is a screw pump or a diaphragm pump.

7. The sludge drying system according to claim 1, characterized in that: The low-temperature belt drying device includes a housing, a transmission mechanism, a drying belt, multiple external air condensers, and a control mechanism. The housing is provided with an inlet and an outlet. The transmission mechanism drives the upper surface of the drying belt to move from the inlet to the outlet. The control mechanism is electrically connected to the transmission mechanism and the multiple external air condensers.

8. A sludge drying system according to claim 7, characterized in that: A drain pipe is provided at the bottom of the box, and multiple interfaces are arrayed on the drain pipe, each of which is connected to the box.

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