Sludge drying system

Abstract

The utility model relates to a sludge drying system, which belongs to the field of energy conservation and environmental protection and comprises a dryer, a feeding module, a discharging module and a steam supply module. Wherein the dryer comprises an input end and an output end; the steam supply module comprises a flue gas heat exchanger and a heat exchange pipeline. The flue gas heat exchanger is used for being connected with a waste gas system of a factory, and waste gas passes through the interior of the flue gas heat exchanger. One end of the heat exchange pipeline is used for connecting and communicating hot water of a factory; and the heat exchange pipeline is partially positioned in the flue gas heat exchanger. Sludge produced by a factory is input into the drying machine through the feeding module, high-temperature flue gas produced by the factory heats hot water in the heat exchange pipeline when passing through the flue gas heat exchanger so that the hot water in the heat exchange pipeline can become steam, and the steam exchanges heat with the sludge after entering the drying machine to achieve drying of the sludge.

Description

Technical Field

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

[0002] Currently, some factories generate sludge during production. Taking paper mills as an example, paper mills generate a large amount of wastewater containing chemical fibers every day during production. The sludge cake after sedimentation and filter pressing generally has a moisture content of about 65%. The wet sludge contains a large amount of sulfides and HCl ions. In order to dispose of this filter press sludge, directly mixing it into the boiler will cause corrosion to the boiler, and the boiler will need to be overhauled every 1-2 years. Therefore, reducing the moisture content of the sludge has become an urgent need. Using a drying system is the most reliable way to reduce the sludge volume.

[0003] In existing technologies, saturated steam or high-temperature flue gas are commonly used as heat sources to indirectly or directly exchange heat with coal slime to evaporate the moisture in the sludge. If steam drying is used, the steam must be at least low-temperature saturated steam. If flue gas is used, a temperature of at least 200°C is more economical; otherwise, using low-temperature flue gas would require a very large dryer drum, and the low temperature of the flue gas would cause significant corrosion to the drum, significantly reducing its service life. Furthermore, low-temperature flue gas drying is environmentally unfriendly, generating a large amount of waste gas and dust. Therefore, we need to provide a more efficient and environmentally friendly sludge drying system. Utility Model Content

[0004] In view of the shortcomings of the existing technologies, this utility model provides a sludge drying system, which improves the efficiency of sludge drying, realizes the recycling of energy, and reduces the drying cost, so as to solve the technical problems of environmental unfriendliness and large amount of waste gas and dust generated in the existing technologies.

[0005] This utility model provides a sludge drying system, comprising:

[0006] A dryer, the dryer including an input end and an output end;

[0007] Feeding module; the feeding module is connected to the input end of the dryer, and the feeding module is used to input materials into the dryer;

[0008] A discharge module is connected to the output end of the dryer; the discharge module is used to discharge the material inside the dryer.

[0009] Steam supply module, the steam supply module comprising:

[0010] A flue gas heat exchanger for connection to a factory's exhaust gas system, the interior of which is used for the passage of exhaust gas;

[0011] A heat exchange pipe, one end of which is connected to and connected to the factory's hot water, and the other end is connected to the dryer; the heat exchange pipe is partially located inside the flue gas heat exchanger;

[0012] The sludge produced by the factory is fed into the dryer through the feeding module. The high-temperature flue gas produced by the factory heats the hot water in the heat exchange pipe when it passes through the flue gas heat exchanger, so that the hot water in the heat exchange pipe turns into steam. After the steam enters the dryer, it exchanges heat with the sludge to dry the sludge.

[0013] The technical solution fully utilizes 100℃ hot water and 150℃ low-temperature flue gas generated by a self-owned power plant. The low-temperature flue gas heats the 100℃ hot water, converting it into low-temperature saturated steam. A steam indirect heat exchange dryer evaporates the moisture in the sludge, reducing the moisture content of the 65% wet sludge to 30%, making it suitable for boiler combustion. This not only improves the efficiency of sludge drying but also achieves energy recycling and reduces drying costs. Simultaneously, the modular design of the system ensures clear functions for each component, making operation and maintenance easy. This improves the automation and reliability of the entire sludge treatment process, effectively solving the problems of high energy consumption and low efficiency in traditional drying methods, and providing a highly efficient and energy-saving solution for the harmless treatment of factory sludge.

[0014] In some embodiments, an exhaust module is also included, the exhaust module comprising:

[0015] An exhaust pipe, one end of which is connected to the dryer;

[0016] A dust collector is installed in the exhaust pipe;

[0017] A negative pressure fan is installed in the exhaust pipe and located on the side of the dust collector away from the dryer.

[0018] In this technical solution, the waste gas emitted from the evaporation of wet sludge during the drying process is drawn to a dust collector by a negative pressure fan. The dust collector filters and removes dust from the waste gas, reducing dust emissions and meeting environmental protection requirements. This design not only improves the environmental friendliness of the drying process but also ensures the health and safety of operators, enhancing the overall environmental friendliness of the system.

[0019] In some embodiments, the exhaust module further includes a condenser disposed in the exhaust pipe and located between the dust collector and the negative pressure fan.

[0020] In this technical solution, the vapor in the exhaust gas is condensed into liquid water using a condenser, thereby achieving the recovery and reuse of moisture in the exhaust gas and reducing water waste. Simultaneously, the temperature of the condensed exhaust gas is lowered, reducing the operational burden on subsequent treatment equipment and improving the energy efficiency and stability of the entire system. Furthermore, the condenser can further remove harmful substances from the exhaust gas, further reducing its environmental impact and making the system more advantageous in terms of environmental protection and energy conservation.

[0021] In some embodiments, the dryer includes:

[0022] case;

[0023] The drying tube is located inside the shell, with one end connected to the outside and the other end connected to the heat exchange pipe.

[0024] In this technical solution, steam can directly enter the drying tube and exchange heat with the sludge. This structural design significantly improves heat transfer efficiency, ensuring the sludge is fully heated during the drying process and accelerating moisture evaporation. Simultaneously, the shell design effectively isolates the drying process from external environmental interference, guaranteeing its stability and reliability. Compared to traditional dryers, this structure significantly improves drying efficiency, shortens drying time, reduces energy consumption, and enhances the quality and efficiency of sludge drying.

[0025] In some embodiments, the sludge drying system includes a drainage module, the drainage module comprising:

[0026] A drain pipe, one end of which is connected to the drying pipe;

[0027] A drain valve is provided on the drain pipe and is used to open and close the drain pipe;

[0028] A shut-off valve is attached to the drain pipe and is used to open and close the drain pipe.

[0029] In this technical solution, the drainage module effectively handles the condensate generated during the drying process. The condensate is discharged through a drain pipe, and the inclusion of a drain valve and a shut-off valve allows for convenient control of the drainage process, preventing condensate buildup in the drying pipes and ensuring optimal drying performance and normal equipment operation. Furthermore, the drainage module design enables the recycling of condensate, reducing water waste and lowering system operating costs. This design not only improves the overall system performance but also enhances its reliability and economy, providing a strong guarantee for the long-term stable operation of the sludge drying system.

[0030] In some embodiments, the drainage module further includes:

[0031] A Y-type filter is installed in the drain pipe;

[0032] A water combing and expansion container is disposed on the drain pipe, and is located on the end of the drain pipe away from the drying pipe.

[0033] In this technical solution, the Y-type filter effectively filters impurities and particulate matter in the condensate, preventing these impurities from entering downstream equipment, extending equipment lifespan, and reducing maintenance costs. The condensate diffuser buffers and stores the condensate, ensuring smoother discharge and preventing excessive pressure from impacting the drainage system. Furthermore, the diffuser allows for centralized treatment and recycling of condensate, further improving water resource utilization and enhancing the system's environmental performance and economic efficiency.

[0034] In some embodiments, the feeding module includes a sludge storage bin, a sludge feeder, a feeding screw conveyor, and a screw feeder;

[0035] The sludge feeder feeds the sludge from the sludge storage silo into the feeding screw conveyor, which then feeds the sludge into the screw feeder, which in turn feeds the sludge into the dryer.

[0036] In this technical solution, the sludge storage silo can store a certain amount of sludge, ensuring continuous feeding; the sludge feeder can evenly feed the sludge into the feeding screw conveyor, avoiding sludge accumulation and blockage; the feeding screw conveyor and screw feeder can stably deliver the sludge into the dryer. This design not only improves feeding efficiency and reduces manual intervention, but also ensures uniform sludge delivery and improves drying quality. At the same time, the modular design makes the feeding process more flexible and controllable, adaptable to different scales of sludge treatment needs, and enhances the system's adaptability and reliability.

[0037] In some embodiments, the discharge module includes a discharge screw conveyor, a bucket elevator, a dry material silo, and a discharge belt conveyor;

[0038] The discharge screw conveyor is connected to the discharge end of the dryer, the bucket elevator sends the sludge into the dry material silo, and the discharge belt conveyor outputs the sludge from the dry material silo.

[0039] In this technical solution, the discharge screw conveyor smoothly transports the dried sludge from the dryer; the bucket elevator lifts the sludge to the dry silo for storage and subsequent processing; and the discharge belt conveyor outputs the sludge from the dry silo, enabling continuous sludge processing. This design not only improves discharge efficiency and reduces manual operation but also ensures the integrity and consistency of the dried sludge. Furthermore, the automated design of the discharge module allows it to work in conjunction with the feeding module and the dryer, achieving automated operation of the entire sludge drying system and improving overall system performance and operational efficiency.

[0040] In some embodiments, the heat exchange pipe includes a hot water section, a heat exchange section, and a steam section connected in sequence;

[0041] The hot water section is connected to the factory's hot water module;

[0042] The heat exchange section is located inside the flue gas heat exchanger;

[0043] The steam section is connected to the dryer.

[0044] In this technical solution, the hot water section is connected to the plant's hot water module, providing a stable hot water source for the system. The heat exchange section, located within the flue gas heat exchanger, heats the hot water into steam through heat exchange with the plant's high-temperature flue gas. The steam section then transports the generated steam to the dryer, providing heat energy for sludge drying. This structural design fully utilizes the waste heat from the plant's exhaust gas, improving energy efficiency and reducing drying costs. Simultaneously, the segmented design of the heat exchange pipelines makes the heat exchange process more efficient and stable, ensuring the quality and continuity of steam supply, and improving the energy efficiency and reliability of the entire sludge drying system.

[0045] In some embodiments, the hot water section is provided with:

[0046] An electric regulating valve is used to regulate the flow rate of the hot water section;

[0047] A flow sensor is used to detect the flow rate of the hot water section.

[0048] In this technical solution, the electric regulating valve automatically adjusts the hot water flow rate according to actual needs, ensuring the stability and efficiency of the heat exchange process. The flow sensor monitors the hot water flow rate in real time, providing data support for the system's automated control. Through this design, the system can automatically adjust the hot water flow rate based on the actual operating conditions of the dryer and the moisture content of the sludge, thereby achieving precise heat supply and improving drying efficiency and energy utilization. Simultaneously, this intelligent control method reduces human error, improves the system's operational stability and reliability, and provides strong support for the efficient operation of the sludge drying system.

[0049] Based on the above technical solution, in this embodiment of the utility model, 100℃ hot water and 150℃ low-temperature flue gas generated by a self-owned power plant are fully utilized. The 100℃ hot water is heated by the low-temperature flue gas, converting it into low-temperature saturated steam. A steam indirect heat exchange dryer is then used to evaporate the moisture in the sludge, reducing the water content of the 65% wet sludge to 30%, making it suitable for boiler combustion. This not only improves the efficiency of sludge drying but also achieves energy recycling and reduces drying costs. Simultaneously, the modular design of the system makes each part functionally clear and easy to operate and maintain, improving the automation and reliability of the entire sludge treatment process. It effectively solves the problems of high energy consumption and low efficiency in traditional drying methods, providing a highly efficient and energy-saving solution for the harmless treatment of factory sludge. Attached Figure Description

[0050] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0051] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the sludge drying system of this utility model;

[0052] Figure 2 This is a schematic diagram of the steam supply module in one embodiment of the sludge drying system of this utility model.

[0053] Figure 3 This is a schematic diagram of the feeding module in one embodiment of the sludge drying system of this utility model;

[0054] Figure 4 This is a schematic diagram of the discharge module of one embodiment of the sludge drying system of this utility model.

[0055] In the picture:

[0056] 1. Wet sludge storage silo; 2. Sludge feeder; 3. Feeding screw conveyor; 4. Screw feeder; 5. Dryer; 6. Discharge screw conveyor; 7. Bucket elevator; 8. Dry silo; 9. Discharge belt conveyor; 10. Dust collector; 11. Condenser; 12. Negative pressure fan; 13. Flue gas heat exchanger; 14. Steam inlet metal hose; 15. Condensate outlet metal hose; 16. Drain valve; 17. Shut-off valve; 18. Y-type filter; 19. Steam trap; 20. Check valve; 21. Electric regulating valve; 22. Flow sensor; 23. Steam safety valve; 24. Heat exchange pipe; 25. Drain pipe; 26. Drainage expansion tank. Detailed Implementation

[0057] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0058] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.

[0059] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0060] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0061] Referring to all the accompanying drawings, in one illustrative embodiment of the sludge drying system of this utility model, the sludge drying system includes a dryer 5, which includes an input end and an output end. The dryer 5 is used to dry the generated sludge.

[0062] In some embodiments, the sludge drying system includes a feeding module connected to the input end of the dryer 5, which is used to feed materials into the dryer 5.

[0063] In some embodiments, the sludge drying system includes a discharge module connected to the output end of the dryer 5; the discharge module is used to discharge the material inside the dryer 5.

[0064] In some embodiments, the sludge drying system includes a steam supply module. The steam supply module provides a heat source to the dryer 5 to dry the sludge.

[0065] In some embodiments, the steam supply module includes a flue gas heat exchanger 13 and a heat exchange pipe 24. The flue gas heat exchanger 13 is connected to the plant's waste gas system, and the interior of the flue gas heat exchanger 13 is used for the passage of waste gas. One end of the heat exchange pipe 24 is connected to and communicates with the plant's hot water, and the other end is connected to the dryer 5; a portion of the heat exchange pipe 24 is located within the flue gas heat exchanger 13.

[0066] The sludge produced by the factory is fed into the dryer 5 through the feeding module. The high-temperature flue gas produced by the factory heats the hot water in the heat exchange pipe 24 when it passes through the flue gas heat exchanger 13, so that the hot water in the heat exchange pipe 24 becomes steam. The steam enters the dryer 5 and exchanges heat with the sludge to dry the sludge.

[0067] Compared to existing technologies, which rely solely on high-temperature flue gas connected to dryer 5 for sludge drying, requiring temperatures of at least 200°C to be economical, using low-temperature flue gas would result in a very large dryer cylinder. Furthermore, the low temperature of the flue gas would cause significant corrosion to the cylinder, drastically reducing its lifespan. Additionally, low-temperature flue gas drying is environmentally unfriendly, generating large amounts of waste gas and dust. Using hot water directly for drying would result in insufficient temperature.

[0068] This application fully utilizes 100℃ hot water and 150℃ low-temperature flue gas generated by a self-owned power plant. The 100℃ hot water is heated by the low-temperature flue gas, converting it into low-temperature saturated steam. A steam indirect heat exchange dryer 5 evaporates the moisture in the sludge, reducing the water content of the 65% wet sludge to 30%, making it suitable for boiler combustion. This not only improves the efficiency of sludge drying but also achieves energy recycling and reduces drying costs. Furthermore, the modular design of the system makes each part functionally clear and easy to operate and maintain, improving the automation and reliability of the entire sludge treatment process. It effectively solves the problems of high energy consumption and low efficiency in traditional drying methods, providing a highly efficient and energy-saving solution for the harmless treatment of factory sludge.

[0069] In some embodiments, the dryer 5 is a steam drum dryer 5.

[0070] In some embodiments, one end of the flue gas heat exchanger 13 is connected to the factory's exhaust gas system, and the other end is connected to the factory's exhaust gas treatment system. In the prior art, the factory's exhaust gas system is directly connected to the exhaust gas treatment system. However, in this application, a flue gas heat exchanger 13 is installed on the pipeline between the exhaust gas system and the exhaust gas treatment system. The high-temperature exhaust gas output from the factory exchanges heat with the hot water in the heat exchange pipeline 24 within the flue gas heat exchanger 13, thereby reducing its temperature before being output to the exhaust gas treatment system.

[0071] In some embodiments, the dryer 5 includes a shell and a drying tube, the drying tube being located inside the shell, with one end connected to the outside and the other end connected to a heat exchange pipe 24. Steam can directly enter the drying tube and exchange heat with the sludge. This structural design greatly improves the heat transfer efficiency, ensuring that the sludge is fully heated during the drying process and accelerating moisture evaporation. Simultaneously, the shell design effectively isolates the drying process from external environmental interference, ensuring the stability and reliability of the drying process. Compared to traditional dryers 5, this structure significantly improves drying efficiency, shortens drying time, reduces energy consumption, and improves the quality and efficiency of sludge drying.

[0072] During the sludge drying process, the moisture in the sludge evaporates, forming steam and dust. This steam and dust accumulate inside the dryer 5, affecting the drying effect. Therefore, some embodiments include an exhaust module to remove the exhaust gas containing steam and dust from the dryer 5, improving both environmental protection and drying efficiency.

[0073] In some embodiments, the exhaust module includes an exhaust pipe, a dust collector 10, and a negative pressure fan 12. One end of the exhaust pipe is connected to the dryer 5. The dust collector 10 is disposed on the exhaust pipe. The negative pressure fan 12 is disposed on the exhaust pipe, located on the side of the dust collector 10 furthest from the dryer 5. The exhaust gas emitted from the evaporation of wet sludge during the drying process is drawn to the dust collector 10 by the negative pressure fan 12. The dust collector 10 filters and removes dust from the exhaust gas, reducing dust emissions and meeting environmental protection requirements. This design not only improves the environmental friendliness of the drying process but also ensures the health and safety of operators, enhancing the overall environmental friendliness of the system.

[0074] In some embodiments, the exhaust module further includes a condenser 11, which is disposed in the exhaust pipe and located between the dust collector 10 and the negative pressure fan 12. The condenser 11 condenses the vapor in the exhaust gas into liquid water, thereby achieving the recovery and reuse of moisture in the exhaust gas and reducing water waste. Simultaneously, the temperature of the condensed exhaust gas is reduced, lowering the operating burden on subsequent treatment equipment and improving the energy efficiency and stability of the entire system. Furthermore, the condenser 11 can further remove harmful substances from the exhaust gas, further reducing the environmental impact and making the system more advantageous in terms of environmental protection and energy conservation.

[0075] In some embodiments, one end of the exhaust pipe is connected to and communicates with the housing of the dryer 5, and the other end is connected to the waste gas treatment system of the plant. The treated gas re-enters the waste gas treatment system for secondary filtration, further improving the environmental protection effect.

[0076] In some embodiments, the heat exchange pipe 24 includes a hot water section, a heat exchange section, and a steam section connected in sequence; the hot water section is connected to the plant's hot water module; the heat exchange section is located within the flue gas heat exchanger 13; and the steam section is connected to the dryer 5. The hot water section, connected to the plant's hot water module, provides a stable hot water source for the system; the heat exchange section, located within the flue gas heat exchanger 13, heats the hot water into steam through heat exchange with the plant's high-temperature flue gas; the steam section then delivers the generated steam to the dryer 5, providing heat energy for sludge drying. This structural design fully utilizes the waste heat from the plant's exhaust gas, improving energy efficiency and reducing drying costs. Simultaneously, the segmented design of the heat exchange pipe 24 makes the heat exchange process more efficient and stable, ensuring the quality and continuity of steam supply, and improving the energy efficiency and reliability of the entire sludge drying system.

[0077] In some embodiments, the heat exchange section is coiled within the flue gas heat exchanger 13. This increases the contact area and improves the heat exchange effect.

[0078] Furthermore, the diameter of the heat exchange section can be smaller than that of the hot water section.

[0079] In some embodiments, an electric regulating valve 21 and a flow sensor 22 are installed on the hot water section. The electric regulating valve 21 is used to regulate the flow rate of the hot water section. The flow sensor 22 is used to detect the flow rate of the hot water section. The electric regulating valve 21 can automatically adjust the flow rate of the hot water according to actual needs, ensuring the stability and efficiency of the heat exchange process; the flow sensor 22 can detect the flow rate of the hot water in real time, providing data support for the automated control of the system. Through this design, the system can automatically adjust the hot water flow rate according to the actual operating conditions of the dryer 5 and the moisture content of the sludge, thereby achieving precise heat energy supply and improving the drying effect and energy utilization efficiency. At the same time, this intelligent control method can also reduce human operation errors, improve the operational stability and reliability of the system, and provide a strong guarantee for the efficient operation of the sludge drying system.

[0080] In some embodiments, the end of the steam section away from the heat exchange section is connected to and communicates with the drying pipe.

[0081] In some embodiments, a steam safety valve 23 is installed on the steam section. When the pressure in the steam system exceeds a set safety threshold, the safety valve will automatically open to release excess steam, thereby preventing excessive system pressure from causing equipment damage, pipe rupture, or even safety accidents. It effectively ensures the stable operation of the entire steam supply module and guarantees the safety and reliability of the drying process. At the same time, the normal operation of the safety valve can also prevent potential dangers to operators caused by abnormal pressure increases, making it an indispensable safety device in the system.

[0082] In some embodiments, the steam section and the drying pipe are connected by a steam inlet metal hose 14.

[0083] In some embodiments, the sludge drying system includes a drainage module, which comprises a drain pipe 25, a drain valve 16, and a shut-off valve 17. The drain valve 16 is connected to the drain pipe 25 and is used to open and close the drain pipe 25. The shut-off valve 17 is connected to the drain pipe 25 and is used to open and close the drain pipe 25. The drainage module effectively handles the condensate generated during the drying process. By discharging the condensate through the drain pipe 25 and by using the drain valve 16 and shut-off valve 17, the drainage process can be easily controlled, preventing condensate from accumulating in the drying pipe and thus avoiding affecting the drying effect and normal operation of the equipment. Simultaneously, the drainage module design also enables the recycling of condensate, reducing water waste and lowering system operating costs. This design not only improves the overall performance of the system but also enhances its reliability and economy, providing a strong guarantee for the long-term stable operation of the sludge drying system.

[0084] In some embodiments, one end of the drain pipe 25 is connected to the end of the drying pipe away from the steam section. The drain pipe 25 and the drying pipe are connected by a condensate drain hose 15.

[0085] In some embodiments, the drainage module further includes a Y-type filter 18 and a water diversion expansion container. The Y-type filter 18 is disposed on the drain pipe 25. The water diversion expansion container is disposed on the drain pipe 25, at the end of the drain pipe 25 furthest from the drying pipe. The Y-type filter 18 effectively filters impurities and particulate matter in the condensate, preventing these impurities from entering downstream equipment, extending equipment lifespan, and reducing equipment maintenance costs. The water diversion expansion container buffers and stores the condensate, making the discharge of condensate more stable and avoiding impact on the drainage system due to excessive drainage pressure. Furthermore, the water diversion expansion container enables centralized treatment and recycling of condensate, further improving water resource utilization and enhancing the system's environmental performance and economic efficiency.

[0086] In some embodiments, the drainage module further includes a steam trap 19, which is disposed on the drain pipe 25 and located between the Y-type filter 18 and the water distribution expansion tank. The steam trap 19, located between the Y-type filter 18 and the water distribution expansion tank on the drain pipe 25, effectively separates and discharges condensate while preventing steam leakage, ensuring efficient utilization of system heat. This design not only improves drainage efficiency and prevents condensate accumulation in the system from affecting drying performance, but also further optimizes water resource recycling and reduces waste. Furthermore, the automatic drainage function of the steam trap 19 reduces the need for manual intervention, improves the automation level and operational stability of the system, enhances the reliability and economy of the entire drainage module, and provides strong support for the efficient and energy-saving operation of the sludge drying system.

[0087] In some embodiments, the drainage module further includes a check valve 20, which is disposed on the drain pipe 25 and located between the steam trap 19 and the sludge expansion tank. The check valve 20 prevents backflow of condensate in the drain pipe 25, ensuring unidirectional flow of condensate and thus avoiding problems such as equipment corrosion, pipe blockage, or abnormal system pressure caused by backflow. Working in conjunction with the steam trap 19, the check valve 20 further improves drainage efficiency and enhances the stability and reliability of the system. Simultaneously, the check valve 20 effectively reduces the impact of condensate on the sludge expansion tank, extending equipment lifespan and reducing maintenance costs. This design, while ensuring efficient system operation, also improves the automation level and economy of the entire sludge drying system, providing important support for achieving environmentally friendly and energy-saving sludge treatment goals.

[0088] The working principle and process of the steam supply module: 100℃ hot water flows into the flue gas heat exchanger 13 through heat exchange pipe 24. The inlet and outlet of the flue gas heat exchanger 13 are connected to the low-temperature flue gas pipe of the original factory's waste gas system. The low-temperature flue gas passes through the shell, and the 100℃ hot water passes through the heat exchange pipe. After heat exchange between the low-temperature flue gas and the 100℃ hot water, it becomes low-temperature saturated steam. It enters the dryer 5 through the rotary joint steam inlet metal hose 14 and indirectly exchanges heat with the wet sludge. The condensate after heat exchange passes through the steam trap 19 to prevent steam from passing through and to discharge the condensate. It then enters the condensate expansion tank 26 through the drain pipe 25. Finally, the condensate can be further recycled. The flow sensor 22 can feed back a signal to the PLC to control the opening of the electric regulating valve 21 of the heat exchange pipe 24 to stabilize the flow rate of the 100℃ hot water.

[0089] In some embodiments, the feeding module includes a sludge storage silo, a sludge feeder 2, a feeding screw conveyor 3, and a screw feeder 4. The sludge feeder 2 feeds sludge from the sludge storage silo into the feeding screw conveyor 3, which then feeds the sludge into the screw feeder 4, which in turn feeds the sludge into the dryer 5. The sludge storage silo can store a certain amount of sludge, ensuring continuous feeding; the sludge feeder 2 can evenly feed sludge into the feeding screw conveyor 3, preventing sludge accumulation and blockage; the feeding screw conveyor 3 and screw feeder 4 can stably feed the sludge into the dryer 5. This design not only improves feeding efficiency and reduces manual intervention but also ensures uniform sludge delivery and improves drying quality. Simultaneously, the modular design makes the feeding process more flexible and controllable, adaptable to different scales of sludge treatment needs, and enhances the system's adaptability and reliability.

[0090] In some embodiments, the discharge module includes a discharge screw conveyor 6, a bucket elevator 7, a dry silo 8, and a discharge belt conveyor 9. The discharge screw conveyor 6 is connected to the discharge end of the dryer 5, the bucket elevator 7 feeds sludge into the dry silo 8, and the discharge belt conveyor 9 outputs the sludge from the dry silo 8. The discharge screw conveyor 6 can smoothly transport the dried sludge out of the dryer 5; the bucket elevator 7 can lift the sludge to the dry silo 8 for easy storage and subsequent processing; and the discharge belt conveyor 9 can output the sludge from the dry silo 8, realizing continuous sludge processing. This design not only improves discharge efficiency and reduces manual operation, but also ensures the integrity and consistency of the dried sludge. Simultaneously, the automated design of the discharge module can work in conjunction with the feeding module and the dryer 5 to achieve automated operation of the entire sludge drying system, improving the overall performance and operating efficiency of the system.

[0091] Through the description of several embodiments of the sludge drying system of this utility model, it can be seen that the embodiments of the sludge drying system of this utility model have at least one or more of the following advantages:

[0092] 1. By fully utilizing the 100℃ hot water and 150℃ low-temperature flue gas generated by the self-owned power plant, the 100℃ hot water is heated by the low-temperature flue gas, turning it into low-temperature saturated steam. A steam indirect heat exchange dryer 5 is then used to evaporate the moisture in the sludge, reducing the water content of the 65% wet sludge to 30%, making it suitable for boiler combustion. This not only improves the efficiency of sludge drying but also achieves energy recycling and reduces drying costs.

[0093] 2. The exhaust module is used to remove the exhaust gas containing steam and dust from the dryer 5, thereby improving both environmental protection and drying efficiency.

[0094] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0095] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A sludge drying system, characterized by, The system comprises: a dryer comprising an input end and an output end; a feeding module; the feeding module is connected to the input end of the dryer, and is used for feeding materials into the dryer; a discharging module connected to the output end of the dryer, and used for discharging materials from the dryer; a steam supply module comprising: a flue gas heat exchanger connected to a waste gas system of a factory, and used for allowing waste gas to pass through the flue gas heat exchanger; a heat exchange pipeline having one end connected to and in communication with hot water of the factory, and the other end connected to the dryer, and partially located in the flue gas heat exchanger; sludge produced by the factory is fed into the dryer through the feeding module, and high-temperature flue gas produced by the factory heats the hot water in the heat exchange pipeline when passing through the flue gas heat exchanger, so that the hot water in the heat exchange pipeline is changed into steam, and the steam exchanges heat with the sludge in the dryer to dry the sludge.

2. The sludge drying system of claim 1, wherein The system further comprises an exhaust module comprising: an exhaust pipe having one end in communication with the dryer; a dust collector arranged in the exhaust pipe; a negative pressure fan arranged in the exhaust pipe and located on a side of the dust collector away from the dryer.

3. The sludge drying system of claim 2, wherein The exhaust module further comprises a condenser arranged in the exhaust pipe and located between the dust collector and the negative pressure fan.

4. The sludge drying system of claim 1, wherein The dryer comprises: a shell; a drying pipe located in the shell, and having one end in communication with the outside and the other end in communication with the heat exchange pipeline.

5. The sludge drying system of claim 4, wherein, The sludge drying system comprises a drainage module comprising: a drainage pipe having one end in communication with the drying pipe; a blowdown valve arranged in the drainage pipe and used for opening and closing the drainage pipe; a stop valve arranged in the drainage pipe and used for opening and closing the drainage pipe.

6. The sludge drying system of claim 5, wherein, The drainage module further comprises: a Y-type filter arranged in the drainage pipe; a comb water expander arranged in the drainage pipe and located on a side of the drainage pipe away from the drying pipe.

7. The sludge drying system of claim 1, wherein The feeding module comprises a sludge storage bin, a sludge shifter, a feeding screw conveyor and a screw feeder. The sludge shifter shifts sludge in the sludge storage bin into the feeding screw conveyor, the sludge is sent into the screw feeder through the feeding screw conveyor, and the sludge is sent into the dryer by the screw feeder.

8. The sludge drying system of claim 1, wherein, The discharging module comprises a discharging screw conveyor, a bucket elevator, a dry bin and a discharging belt conveyor. The discharging screw conveyor is connected to a discharging end of the dryer, the bucket elevator sends sludge into the dry bin, and the discharging belt conveyor discharges sludge in the dry bin.

9. The sludge drying system of claim 1, wherein, The heat exchange pipeline comprises a hot water section, a heat exchange section and a steam section in sequence. The hot water section is in communication with a hot water module of the factory. The heat exchange section is located in the flue gas heat exchanger. The steam section is in communication with the dryer.

10. The sludge drying system of claim 9, wherein, The hot water section is provided with: an electric regulating valve used for regulating the flow of the hot water section. a flow sensor for detecting the flow of the hot water section.

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