Multifunctional sludge drying device

Abstract

The application relates to a multifunctional sludge drying device and relates to the technical field of sludge treatment. The device comprises a sludge drying device cylinder, a stirring mechanism, an air inlet mechanism, an upper heat preservation mechanism and a lower heat preservation mechanism. The stirring mechanism is installed on the sludge drying device cylinder and is used for stirring the sludge in the sludge drying device cylinder. The air inlet mechanism is connected to one side of the sludge drying device cylinder and is used for feeding dry gas into the sludge drying device cylinder. The upper heat preservation mechanism is installed on the top of the sludge drying device cylinder and is used for heat recovery. The lower heat preservation mechanism is installed on the bottom of the sludge drying device cylinder and is connected to the upper heat preservation mechanism through an upper and lower jacket flow guide hose and is used for heat preservation of the sludge drying device cylinder. The air inlet mechanism, the upper heat preservation mechanism and the lower heat preservation mechanism are adopted, heat recovery can be realized, the whole drying process can be quickly started, the sludge drying process and time are accelerated, and the drying efficiency is improved.

Description

A multifunctional sludge drying device Technical Field

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

[0002] With my country's economic development and accelerated urbanization, the coverage of wastewater treatment is constantly expanding. Sludge, primarily from urban and industrial wastewater treatment plants, is a byproduct of wastewater treatment, and its production volume is enormous. Statistics show that my country's annual sludge production reached 60 million tons in 2019 (based on an 80% moisture content), and is projected to exceed 90 million tons by 2025. To facilitate transportation and subsequent treatment, wastewater treatment plants mechanically filter the sludge before it leaves the plant for further processing. At this stage, the sludge's moisture content is generally around 80%. This relatively high moisture content is a crucial factor to consider in sludge treatment and disposal.

[0003] The mainstream sludge treatment processes in my country are currently: ① drying and incineration + building material utilization; ② anaerobic + land application; ③ aerobic + land application; ④ deep dewatering + incineration / landfill. All four of these main processes share a crucial problem that needs to be addressed: sludge drying. Therefore, providing a multifunctional sludge drying device has become an urgent technical challenge for those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional sludge drying device, which employs an air intake mechanism, an upper insulation mechanism, and a lower insulation mechanism to achieve heat recovery, quickly start the entire drying process, accelerate the sludge drying process and time, and improve drying efficiency.

[0005] To achieve the above objectives, the present invention provides a multifunctional sludge drying device, comprising: a sludge drying device cylinder, a stirring mechanism, an air inlet mechanism, an upper insulation mechanism, and a lower insulation mechanism; wherein, the sludge drying device cylinder has a feed inlet at the top and a discharge outlet at the bottom; the stirring mechanism is installed on the sludge drying device cylinder and is used to stir the sludge inside the sludge drying device cylinder; the air inlet mechanism is connected to one side of the sludge drying device cylinder and is used to introduce drying gas into the sludge drying device cylinder; the upper insulation mechanism is installed at the top of the sludge drying device cylinder and is used for heat recovery; the lower insulation mechanism is installed at the bottom of the sludge drying device cylinder and is connected to the upper insulation mechanism through upper and lower jacketed guide hoses for heat preservation of the sludge drying device cylinder.

[0006] Furthermore, the stirring mechanism includes a stirring motor, a reducer, and a stirrer. The stirrer is inserted into the cylinder of the sludge drying device, and the stirring motor is connected to the stirrer via the reducer.

[0007] Furthermore, the agitator includes a front-end transmission device, a stirring shaft, a stirring paddle, and an end-end transmission device. The front end of the stirring shaft is rotatably connected to one end of the sludge drying device cylinder via the front-end transmission device, and the end of the stirring shaft is rotatably connected to the other end of the sludge drying device cylinder via the end-end transmission device. The stirring paddle is circumferentially mounted on the stirring shaft.

[0008] Furthermore, the air intake mechanism includes a fan, an air buffer tank, and an air heater. The fan is connected in sequence to the air buffer tank, the air heater, and the air inlet of the sludge drying device cylinder via an air pipe.

[0009] Furthermore, the upper insulation mechanism includes an upper jacket and jacket baffles. The upper jacket is installed at the top of the cylinder of the sludge drying device, and a cavity is formed inside the upper jacket. The jacket baffles are spaced apart on the upper and lower inner walls of the cavity.

[0010] Furthermore, the upper insulation mechanism also includes an upper jacket insulation layer, which is disposed on the outer wall of the upper jacket.

[0011] Furthermore, the lower insulation mechanism includes a lower jacket and a lower jacket insulation layer. The lower jacket is installed at the bottom end of the sludge drying device cylinder, and a cavity is formed inside the lower jacket. The lower jacket insulation layer is disposed on the outer wall of the lower jacket.

[0012] Furthermore, it also includes a material guiding mechanism, which includes a lifting device and a drying device rotator. The lifting device is located below the end of the sludge drying device cylinder, and the drying device rotator is installed at the discharge port of the sludge drying device cylinder.

[0013] Furthermore, an air baffle is provided at the location corresponding to the air inlet position on the cylinder of the sludge drying device.

[0014] Furthermore, the end of the stirring paddle adopts a curved surface design.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention can be used for the rapid drying of various sludge and the rapid aerobic fermentation of different organic fertilizers, and has multiple functions. It adopts an air intake mechanism, an upper insulation mechanism and a lower insulation mechanism to realize heat recovery, which can quickly start the entire drying process, accelerate the sludge drying process and time, and improve drying efficiency. It uses its own equipment for heat recovery without the need for external equipment. The equipment adopts a jacketed energy recovery method to achieve multiple functions. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of the sludge drying device cylinder of the present invention;

[0019] Figure 3 is a cross-sectional view of plane AA in Figure 2;

[0020] Figure 4 is a cross-sectional view of plane BB in Figure 2;

[0021] Figure 5 is a schematic diagram of the internal structure of the agitator.

[0022] In the diagram: 1-End drive device; 2-Sludge drying device cylinder; 3-Gas outlet; 4-Upper jacket; 5-Jacket baffle; 6-Agitator; 7-Agitator shaft; 8-Front-end drive device; 9-Reducer; 10-Agitator motor; 11-Air inlet; 12-Air baffle; 13-Drying device rotator; 14-Front support; 15-Lower jacket; 16-Equipment drain valve; 17-Rear support; 18-Lifting device; 19-Air pipe; 20-Air heater; 21-Air buffer tank; 22-Fan; 23-Upper jacket insulation layer; 24-Condensate outlet; 25-Lower jacket insulation layer; 26-Condensate overflow plate; 27-Upper and lower jacket guide hoses. Detailed Implementation

[0023] To achieve the above objectives and effects, the technical means and structure adopted by the present invention will be described in detail with reference to the accompanying drawings, focusing on the features and functions of the preferred embodiments of the present invention.

[0024] As shown in Figures 1-5, this invention provides a multifunctional sludge drying device, comprising: a sludge drying device cylinder 2, a stirring mechanism, an air inlet mechanism, an upper insulation mechanism, and a lower insulation mechanism; wherein, the sludge drying device cylinder 2 has a feed inlet at the top and a discharge outlet at the bottom; the stirring mechanism is installed on the sludge drying device cylinder 2 and is used to stir the sludge inside the sludge drying device cylinder 2; the air inlet mechanism is connected to one side of the sludge drying device cylinder 2 and is used to introduce drying gas into the sludge drying device cylinder 2; the upper insulation mechanism is installed on the top of the sludge drying device cylinder 2 and is used for heat recovery; the lower insulation mechanism is installed on the bottom of the sludge drying device cylinder 2 and is connected to the upper insulation mechanism through upper and lower jacketed guide hoses 27 for heat preservation of the sludge drying device cylinder 2. A front support 14 is provided at the bottom of the front end of the sludge drying device cylinder 2, and a rear support 17 is provided at the bottom of the rear end.

[0025] The stirring mechanism includes a stirring motor 10, a reducer 9, and a stirrer. The stirrer is inserted into the cylinder 2 of the sludge drying device, and the stirring motor 10 is connected to the stirrer via the reducer 9. The stirrer includes a front-end transmission device 8, a stirring shaft 7, a stirring paddle 6, and an end-end transmission device 1. The front end of the stirring shaft 7 is rotatably connected to one end of the cylinder 2 of the sludge drying device via the front-end transmission device 8, and the end of the stirring shaft 7 is rotatably connected to the other end of the cylinder 2 of the sludge drying device via the end-end transmission device 1. The stirring paddle 6 is circumferentially mounted on the stirring shaft 7. The end of the stirring paddle 6 has a curved surface design. The end of the mixing paddle 6 features a curved surface design, which continuously tumbles and scoops the sludge. The mixing shaft 7 and the curved connecting rod at the end of the mixing paddle 6 agitate the sludge. This ensures uniform mixing while minimizing resistance during the mixing process, reducing the requirements on the mixing shaft 7, reducer 9, and mixing motor 10. Furthermore, because the mixing is uniform throughout the entire device, there is no sludge accumulation problem. The device uses a "tilting" method for discharge, thus reducing the conveying issues associated with screw discharge. All of these key points are addressed in a simple way, thereby greatly reducing the equipment's maintenance requirements.

[0026] The air intake mechanism includes a fan 22, an air buffer tank 21, and an air heater 20. The fan 22 is connected to the air buffer tank 21, the air heater 20, and the air inlet 11 of the sludge drying device cylinder 2 in sequence through an air pipe 19.

[0027] The upper insulation mechanism includes an upper jacket 4 and jacket baffles 5. The upper jacket 4 is installed at the top of the sludge drying device cylinder 2, and a cavity is formed inside the upper jacket 4. The jacket baffles 5 are spaced apart on the upper and lower inner walls of the cavity. The upper insulation mechanism also includes an upper jacket insulation layer 23, which is disposed on the outer wall of the upper jacket 4.

[0028] The lower insulation mechanism includes a lower jacket 15 and a lower jacket insulation layer 25. The lower jacket 15 is installed at the bottom end of the sludge drying device cylinder 2, and a cavity 2 is formed inside the lower jacket 15. The lower jacket insulation layer 25 is disposed on the outer wall of the lower jacket 15. A condensate outlet 24 is provided on one side of the lower jacket 15, and a condensate overflow plate 26 is provided at the connection between the cavity 2 and the condensate outlet 24. An equipment drain valve 16 is installed at the condensate outlet 24.

[0029] The equipment uses a jacketed energy recovery method to achieve multiple functions: the residual heat in the sludge drying or organic fertilizer fermentation process enters the upper jacket 4 from the gas outlet 3 along with the gas (water vapor, air, fermentation gas, etc.). Under the action of the baffle plate, the gas flows up and down, transferring the heat to the sludge drying device cylinder 2. The water vapor in the gas condenses down, further insulating the sludge drying device cylinder 2 and recovering the heat.

[0030] The present invention also includes a material guiding mechanism, which includes a lifting device 18 and a drying device rotator 13. The lifting device 18 is located below the end of the sludge drying device cylinder 2, and the drying device rotator 13 is installed at the discharge port of the sludge drying device cylinder 2.

[0031] An air baffle 12 is provided at the position corresponding to the air inlet 11 of the sludge drying device cylinder 2. This ensures that air enters the interior of the sludge drying device cylinder 2 evenly, thereby achieving uniform drying of the sludge and avoiding uneven drying in certain areas.

[0032] The advantages of this invention include: ① Multiple functions: This equipment can be used for rapid drying of various types of sludge and rapid aerobic fermentation of different organic fertilizers, possessing multiple functions; ② Low energy consumption: It utilizes its own equipment for heat recovery, eliminating the need for external equipment. The equipment employs a jacketed energy recovery method to achieve multiple functions: residual heat during sludge drying or organic fertilizer fermentation enters the upper jacket from the gas outlet along with gases (water vapor, air, fermentation gases, etc.). Under the action of baffles, the gas flows up and down, transferring heat to the sludge drying device cylinder. Water vapor in the gas condenses, further insulating the sludge drying device cylinder and recovering heat; ③ Easy maintenance: The end of the stirring paddle adopts a curved surface design. The curved surface continuously scoops up the sludge, and the stirring shaft and curved connecting rod stir the sludge. While ensuring uniform stirring, it minimizes resistance during the stirring process, reducing the requirements on the stirring shaft, reducer, and stirring motor. In addition, during the mixing process, the entire equipment is uniformly mixed, preventing sludge accumulation. The equipment uses a "tilting" method for discharge, reducing the need for conveying materials via a screw conveyor. These key issues are all addressed in a simple way, greatly reducing equipment maintenance requirements. ④ Quick start-up: The use of an air heater, upper insulation mechanism, and lower insulation mechanism enables rapid start-up of the entire drying process, accelerating the sludge drying process and time, and improving drying efficiency. ⑤ Simple control: The device uses fewer linkage devices, only the mixing motor, the drying device rotator, and the lifting device. Therefore, the entire automatic system is simpler, has lower maintenance costs, and is easier to control.

[0033] The workflow of this invention:

[0034] (1) Close the outlet of the equipment and slowly add the sludge from the inlet. At the same time, turn on the stirring motor to turn and stir the sludge.

[0035] (2) When the sludge reaches 70% to 80% of the sludge drying device cylinder, stop feeding, close the feed inlet, and start the blower to introduce air into the sludge drying device cylinder. If the air temperature passing through the blower is low, the air heater needs to be started to heat the air. The temperature can be determined according to the actual working conditions on site, and is generally controlled between 25 and 60°C.

[0036] After air enters the cylinder of the sludge drying device, it is blown evenly from the bottom of the cylinder into the sludge inside by the action of the air baffle plate, which heats the sludge. The water in the sludge absorbs the heat and forms water vapor.

[0037] (3) Water vapor and air enter the upper jacket through the gas outlet. Under the action of the air baffle, they move up and down, transferring heat to the interior through the inner and outer walls of the sludge drying device cylinder. After the water vapor transfers heat to the interior, it condenses and flows into the lower jacket through the upper and lower jacket guide hoses, forming a "warm water layer" in the lower jacket. This allows the equipment to simultaneously perform heat preservation and heat recovery functions. Excess condensate is discharged to the condensate treatment process through the equipment's drain valve. The gas is discharged to the waste gas treatment process.

[0038] (4) When the sludge is dried to a moisture content of less than 60%, the sludge drying can be stopped. (If it is necessary to make organic fertilizer from the sludge at this time, sawdust, straw, Chinese medicine residue, wheat bran, rice husk, biological agent and other organic fertilizer fermentation raw materials can be added for further fermentation.)

[0039] (5) Open the discharge port and start the lifting device. The lifting device slowly rises and rotates around the rotator of the drying device. The drying device begins to tilt gradually, slowly pouring out the dried sludge.

[0040] (6) After the dried sludge is poured out, the lifting device slowly descends, the sludge drying device cylinder returns to the horizontal position, the discharge port is closed, the feeding port is opened, and the next sludge drying cycle operation process begins.

[0041] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A multifunctional sludge drying device, characterized in that, include: The sludge drying device comprises a cylinder, a stirring mechanism, an air inlet mechanism, an upper insulation mechanism, and a lower insulation mechanism. The cylinder has a feed inlet at the top and a discharge outlet at the bottom. The stirring mechanism is mounted on the cylinder and is used to stir the sludge inside. The air inlet mechanism is connected to one side of the cylinder and is used to introduce drying gas into the cylinder. The upper insulation mechanism is mounted on the top of the cylinder for heat recovery. The lower insulation mechanism is mounted on the bottom of the cylinder and is connected to the upper insulation mechanism via upper and lower jacketed guide hoses for heat preservation of the cylinder. The air inlet mechanism includes a fan. The system includes an air buffer tank and an air heater. The blower is connected to the air buffer tank, the air heater, and the air inlet of the sludge drying device cylinder via air pipes. The upper insulation mechanism includes an upper jacket and jacket baffles. The upper jacket is installed at the top of the sludge drying device cylinder, and a cavity is formed inside the upper jacket. The jacket baffles are spaced apart on the upper and lower inner walls of the cavity. The upper insulation mechanism also includes an upper jacket insulation layer, which is disposed on the outer wall of the upper jacket. The lower insulation mechanism includes a lower jacket and a lower jacket insulation layer. The lower jacket is installed at the bottom of the sludge drying device cylinder, and a cavity is formed inside the lower jacket. The lower jacket insulation layer is disposed on the outer wall of the lower jacket.

2. The multifunctional sludge drying device as described in claim 1, characterized in that, The stirring mechanism includes a stirring motor, a reducer, and a stirrer. The stirrer is inserted into the cylinder of the sludge drying device, and the stirring motor is connected to the stirrer through the reducer.

3. The multifunctional sludge drying device as described in claim 2, characterized in that, The agitator includes a front-end transmission device, a stirring shaft, a stirring paddle, and an end-end transmission device. The front end of the stirring shaft is rotatably connected to one end of the sludge drying device cylinder via the front-end transmission device, and the end of the stirring shaft is rotatably connected to the other end of the sludge drying device cylinder via the end-end transmission device. The stirring paddle is mounted circumferentially on the stirring shaft.

4. The multifunctional sludge drying device as described in claim 1, characterized in that, It also includes a material guiding mechanism, which includes a lifting device and a drying device rotator. The lifting device is located below the end of the sludge drying device cylinder, and the drying device rotator is installed at the discharge port of the sludge drying device cylinder.

5. The multifunctional sludge drying device as described in claim 1, characterized in that, An air baffle is installed at the position corresponding to the air inlet of the sludge drying device cylinder.

6. The multifunctional sludge drying device as described in claim 3, characterized in that, The end of the agitator is designed with a curved surface.

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