Conveying and cooling system for dried sludge

Abstract

The utility model provides a conveying and cooling system for drying sludge, which comprises a Roots blower, an outlet of the Roots blower is connected with an incident end pipeline of an ejector, and an ejection end of the ejector is connected with an outlet pipeline of sludge drying equipment through a star-shaped feeder. The outlet end of the ejector is connected with an inlet of the cyclone separator through a first conveying pipeline, a gas outlet of the cyclone separator is connected with a gas inlet of the dust remover through an exhaust pipeline, and a solid outlet of the cyclone separator is connected with an inlet of the first spiral conveyor. The outlet of the first spiral conveyor is connected with the inlet of the second spiral conveyor through a second conveying pipeline, and the outlet of the second spiral conveyor is connected with the storage bin. The sludge drying and conveying system has the advantages of high conveying efficiency, low equipment energy consumption, environmental friendliness and the like, and the dried sludge can be quickly cooled in the conveying process.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic conveying, and particularly relates to a conveying and cooling system for dried sludge. Background Art

[0002] With the continuous development of urban construction, the sewage treatment volume of sewage treatment plants has increased significantly, generating a large amount of sludge as waste. For environmental protection and resource utilization, the sludge is usually dried. The dried sludge is a solid sludge with a certain humidity and a relatively high temperature, usually above 80 °C. Before this solid sludge is transported and processed, it needs to be cooled down before entering the storage bin for storage. Currently, most dried sludge is transported by a water-cooled spiral conveyor to the proximal end of the storage bin, and then sent into the storage bin by a hoist. Since the temperature of the dried sludge needs to be reduced to below 40 °C before entering the storage bin, a large amount of cooling water is used during the water-cooled spiral conveying process. In addition, the rotation speed of the screw conveyor must be very low to ensure a certain cooling effect, resulting in a significant reduction in the conveying efficiency. Moreover, during long-distance and complex working condition transmission, the motor power is high and the equipment energy consumption increases. In addition, using a hoist to transport the dried sludge to the storage bin is prone to causing environmental pollution due to poor airtightness. Content of the Utility Model

[0003] The problem to be solved by the utility model is to provide a conveying and cooling system for dried sludge that uses a pneumatic conveying method to rapidly cool and cool the dried sludge during transportation while improving the transportation efficiency, with low equipment energy consumption and environmental friendliness.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is: a conveying and cooling system for dried sludge, including a Roots blower, the outlet of the Roots blower is connected to the inlet end of the ejector through a pipeline, the suction end of the ejector is connected to the outlet of the sludge drying equipment through a rotary feeder, the outlet end of the ejector is connected to the inlet of the cyclone separator through a first conveying pipeline, the gas outlet of the cyclone separator is connected to the inlet of the dust collector through an exhaust pipeline, the solid outlet of the cyclone separator is connected to the inlet of the first screw conveyor, the outlet of the first screw conveyor is connected to the inlet of the second screw conveyor through a second conveying pipeline, and the outlet of the second screw conveyor is connected to the storage bin.

[0005] Further, the first screw conveyor includes a first conveying cavity, a rotating shaft passing through and rotatably connected to the first conveying cavity, a motor for driving the rotation of the rotating shaft, a double spiral belt mechanism fixedly arranged on the rotating shaft, and a flapping mechanism fixedly arranged on the rotating shaft.

[0006] Further, the bidirectional spiral belt mechanism includes a plurality of support rods vertically and fixedly arranged on the rotating shaft. The plurality of support rods are alternately arranged up and down between each other on the rotating shaft. A first spiral belt and a second spiral belt are fixedly arranged on the support rods, and the first spiral belt and the second spiral belt have opposite spiral directions.

[0007] Further, the flapping mechanism includes a connecting rod for fixedly connecting with the rotating shaft. Flapping plates are fixedly arranged at both ends of the connecting rod, and a plurality of finger teeth are arranged side by side at the free ends of the flapping plates.

[0008] Further, a safety valve is also arranged on the first conveying cavity, and a first pressure gauge is arranged on the safety valve.

[0009] Further, a ball valve and a second pressure gauge are arranged on the first conveying pipeline.

[0010] Further, a temperature measuring instrument is arranged on the second conveying pipeline.

[0011] Further, the second screw conveyor includes a second conveying cavity, a spiral shaft penetrating through and rotatably connected with the second conveying cavity, a speed reducer fixedly connected with the spiral shaft through a coupling, and a three-phase asynchronous motor connected with the speed reducer. A feeding port connected with the second conveying pipeline is arranged in the middle of the second conveying cavity, and discharging ports connected with the storage bin are arranged at both ends of the second conveying cavity.

[0012] Further, a dust hopper is arranged at the lower end of the dust collector, and the outlet of the dust hopper is communicated with the storage bin.

[0013] Compared with the prior art, the advantages and beneficial effects of the present utility model are as follows:

[0014] In the drying sludge conveying and cooling system of the present utility model, the compressed air output by the Roots blower is used as the working fluid. The ejector adopts the Venturi tube principle. After the compressed air enters the ejector, a vacuum is formed in the vacuum chamber inside the ejector, sucking the high-temperature sludge conveyed by the star feeder into the ejector, mixing with the compressed air and spraying out at the outlet of the ejector, entering the cyclone separator through the first conveying pipeline for gas-solid separation. During the process of conveying the dried sludge, the compressed air directly cools the high-temperature dried sludge. The high-temperature gas is separated by the cyclone separator and discharged after being purified by the dust collector. The separated low-temperature solid is fully stirred, dispersed and cooled by the first screw conveyor and then enters the second screw conveyor, which conveys it to the storage bin. Compared with the traditional water-cooled screw conveying method, the present utility model directly uses the conveying carrier for cooling, eliminating the cooling water, saving resources. In addition, it realizes the long-distance conveying of dried sludge under complex working conditions, with high conveying efficiency, effectively saving equipment energy consumption. Moreover, the closed pipeline conveying method reduces the impact of dust and harmful gases on the surrounding environment. Brief Description of the Drawings

[0015] Figure 1 Fig. is a schematic diagram of the overall structure of the conveying and cooling system for drying sludge of the present utility model.

[0016] Figure 2 Fig. is a schematic diagram of the structure of the first screw conveyor of the conveying and cooling system for drying sludge of the present utility model.

[0017] Figure 3 Fig. is a schematic diagram of the structure of the double - screw belt mechanism of the conveying and cooling system for drying sludge of the present utility model.

[0018] Figure 4 Fig. is a schematic diagram of the structure of the flapping mechanism of the conveying and cooling system for drying sludge of the present utility model.

[0019] Figure 5 Fig. is a schematic diagram of the structure of the second screw conveyor of the conveying and cooling system for drying sludge of the present utility model.

[0020] In the figure: 1 - Roots blower; 2 - ejector; 3 - star feeder; 4 - sludge drying equipment; 5 - first conveying pipeline; 6 - cyclone separator; 7 - dust collector; 8 - first screw conveyor; 9 - second conveying pipeline; 10 - storage bin; 11 - first conveying cavity; 12 - rotating shaft; 13 - double - screw belt mechanism; 14 - flapping mechanism; 15 - connecting rod; 16 - flapping plate; 17 - finger teeth; 18 - safety valve; 19 - first pressure gauge; 20 - ball valve; 21 - second pressure gauge; 22 - temperature measuring instrument; 23 - exhaust pipeline; 24 - second screw conveyor; 25 - support rod; 26 - first screw belt; 27 - second screw belt; 28 - second conveying cavity; 29 - screw shaft; 30 - coupling; 31 - reducer; 32 - three - phase asynchronous motor; 33 - feed inlet; 34 - discharge outlet; 35 - ash hopper. Detailed Description of the Preferred Embodiments

[0021] The following detailed description of the preferred embodiments of the present utility model will be made with reference to the accompanying drawings.

[0022] As Figures 1-5As shown in the figure, a conveying and cooling system for dried sludge includes a Roots blower 1. The outlet of the Roots blower 1 is connected to the inlet end of an ejector 2 through a pipeline. The suction end of the ejector 2 is connected to the outlet of a sludge drying device 4 through a star feeder 3. The outlet end of the ejector 2 is connected to the inlet of a cyclone separator 6 through a first conveying pipeline 5. The gas outlet of the cyclone separator 6 is connected to the inlet of a dust collector 7 through an exhaust pipeline 23. The solid outlet of the cyclone separator 6 is connected to the inlet of a first screw conveyor 8. The outlet of the first screw conveyor 8 is connected to the inlet of a second screw conveyor 24 through a second conveying pipeline 9. The outlet of the second screw conveyor 24 is connected to a storage bin 10.

[0023] Specifically, the Roots blower 1 is used to output compressed air as the working fluid. The ejector 2 adopts the Venturi tube principle. After the compressed air enters the ejector 2, a vacuum chamber inside the ejector 2 forms a vacuum, sucking the high-temperature sludge conveyed by the star feeder 3 into the ejector 2. After mixing with the compressed air, it is ejected from the outlet of the ejector 2, enters the cyclone separator 6 through the first conveying pipeline 5 for gas-solid separation. The separated gas enters the dust collector 7 through the gas outlet for filtration and then is discharged. The separated solid enters the first screw conveyor 8 through the solid outlet, is fully stirred and dispersed for heat dissipation, then enters the second screw conveyor 24, and is conveyed to the storage bin 10 by the second screw conveyor 24. Among them, first: using the ejector 2 to convey the dried sludge, by the high-speed kinetic energy and shear force of the compressed gas, it can effectively break the electrostatic force and molecular force of the dried sludge with self-aggregation characteristics, strengthen the dispersion degree of the dried sludge, and improve the conveying efficiency of the dried sludge; second: using the star feeder 3 to send the high-temperature sludge to the suction end of the ejector 2, and at the same time playing the role of blocking the working pressure of the ejector 2 from being exposed to atmospheric pressure; third: the compressed gas drives the sludge to flow as the working fluid, and realizes heat exchange with the dried sludge during the flow process. The high-temperature gas is separated by the cyclone separator 6 and then filtered by the dust collector 7 and discharged, so as to achieve the purpose of cooling.

[0024] Furthermore, the first screw conveyor 8 includes a first conveying cavity 11, a rotating shaft 12 penetrating through the first conveying cavity 11 and rotatably connected thereto, a motor for driving the rotating shaft 12 to rotate, a two-way spiral belt mechanism 13 fixedly arranged on the rotating shaft 12, and a flapping mechanism 14 fixedly arranged on the rotating shaft 12.

[0025] Specifically, the cooled dried sludge enters the first screw conveyor 8. Through the two-way spiral belt mechanism 12 on the rotating shaft 12, the dried sludge is stirred and mixed bidirectionally, repeatedly and sufficiently, making its heat dissipation more sufficient and the temperature more uniform, preventing local overheating. At the same time, combined with the flapping structure 14, the dried sludge is further flapped and dispersed, effectively avoiding the phenomenon of sludge agglomeration. Among them, as Figure 2As shown in the figure, the way the motor drives the rotation of the rotating shaft 12 is that a gear is fixedly arranged at one end of the rotating shaft 12, and a gear is also arranged at the output end of the motor. The two gears are meshed, and the motor controls the rotation of the rotating shaft through the gear structure. Since this structure is a prior art, it will not be elaborated here.

[0026] Furthermore, the bidirectional screw belt mechanism 13 includes a plurality of support rods 25 vertically and fixedly arranged on the rotating shaft 12. The plurality of support rods 25 are alternately arranged up and down between each other on the rotating shaft 12. A first screw belt 26 and a second screw belt 27 are fixedly arranged on the support rods 25, and the first screw belt 26 and the second screw belt 27 have opposite helix directions.

[0027] Specifically, by alternately arranging the support rods 25 on the rotating shaft 12, the first screw belt 26 and the second screw belt 27 can be fixed to the support rods 25. By setting the two screw belts with opposite helix directions, sufficient stirring and dispersion of the dried sludge can be achieved, and further heat dissipation can be realized, effectively preventing local overheating.

[0028] Furthermore, the flapping mechanism 14 includes a connecting rod 15 for fixedly connecting with the rotating shaft 12. Both ends of the connecting rod 15 are fixedly provided with flapping plates 16, and a plurality of finger teeth 17 are arranged side by side at the free ends of the flapping plates 16.

[0029] Specifically, when the rotating shaft 12 rotates, it drives the connecting rod 15 to rotate, thereby driving the flapping plates 16 to flap and disperse the dried sludge. At the same time, the arranged side-by-side finger teeth 17 are similar to the "palm" structure, and the sludge is dispersed at the finger teeth during the flapping process, playing a good role in stirring and dispersing.

[0030] Furthermore, a safety valve 18 is also arranged on the first conveying cavity 11. A first pressure gauge 19 is arranged on the safety valve 18. The first pressure gauge 19 is used to monitor the pressure in the conveying cavity 11 in real time. When the pressure is higher or lower than the normal pressure, the safety valve 18 automatically opens to ensure the safety of the system.

[0031] Furthermore, a ball valve 20 and a second pressure gauge 21 are arranged on the first conveying pipeline 5. The ball valve 20 is arranged to control the fluid flow in the first conveying pipeline 5, and the second pressure gauge 21 is used to monitor the pressure change situation in the first conveying pipeline 5 in real time to ensure the safe operation of the system.

[0032] Furthermore, a temperature measuring instrument 22 is arranged on the second conveying pipeline 9, which is used to measure the temperature of the dried sludge after cooling, and the measured temperature is sent into the second screw conveyor 24.

[0033] Furthermore, the second screw conveyor 24 includes a second conveying cavity 28, a screw shaft 29 penetrating through and rotatably connected to the second conveying cavity 28, a speed reducer 31 fixedly connected to the screw shaft 29 through a coupling 30, and a three-phase asynchronous motor 32 connected to the speed reducer 31. A feed inlet 33 connected to the second conveying pipe 9 is provided in the middle of the second conveying cavity 28, and discharge outlets 34 connected to the storage bin 10 are provided at both ends of the second conveying cavity 28.

[0034] Specifically, after the dried sludge is stirred, dispersed and cooled by the first screw conveyor 8, it enters the second conveying cavity 28 through the second conveying pipe 9. The forward and reverse rotations of the screw shaft 29 are controlled by the three-phase stepping motor 32. When one storage bin 10 is full, the dried sludge can be continuously conveyed to another storage bin 10 without interruption, realizing the continuous conveying and cooling of the dried sludge and improving the conveying efficiency.

[0035] Furthermore, a hopper 35 is provided at the lower end of the dust collector 7, and the outlet of the hopper 35 is communicated with the storage bin 10, so that the recovered dried sludge can be directly discharged into the storage bin 10, and the equipment structure is more optimized.

[0036] Compared with the traditional water-cooled screw conveying method, the present utility model directly uses the conveying carrier to cool the dried sludge, eliminating the cooling water, saving resources. At the same time, it realizes the long-distance conveying of the dried sludge under complex working conditions, with high conveying efficiency, effectively saving the energy consumption of the equipment. Moreover, the closed pipeline conveying method reduces the impact of dust and harmful gases on the surrounding environment.

[0037] The above has described in detail an embodiment of the present utility model, but the content described is only the preferred embodiment of the present utility model and cannot be considered as limiting the scope of implementation of the present utility model. All equivalent changes and improvements made according to the scope of the application of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. A conveying and cooling system for dried sludge, characterized in that: It includes a Roots blower, the outlet of which is connected to the incident end pipe of the ejector, the ejection end of the ejector is connected to the outlet pipe of the sludge drying equipment through a star feeder, the outlet end of the ejector is connected to the inlet of the cyclone separator through a first conveying pipe, the gas outlet of the cyclone separator is connected to the air inlet of the dust collector through an exhaust pipe, the solid outlet of the cyclone separator is connected to the inlet of the first screw conveyor, the outlet of the first screw conveyor is connected to the inlet of the second screw conveyor through a second conveying pipe, and the outlet of the second screw conveyor is connected to a storage bin.

2. The conveying and cooling system for dried sludge according to claim 1, characterized in that: The first screw conveyor includes a first conveying cavity, a rotating shaft penetrating the first conveying cavity and rotatably connected thereto, a motor for driving the rotating shaft to rotate, a bidirectional screw belt mechanism fixedly arranged on the rotating shaft, and a beating mechanism fixedly arranged on the rotating shaft.

3. The conveying and cooling system for dried sludge according to claim 2 is characterized in that: The bidirectional screw belt mechanism includes a plurality of support rods vertically fixed on a rotating shaft, wherein the plurality of support rods are alternately arranged up and down on the rotating shaft, and a first screw belt and a second screw belt are fixedly arranged on the support rods, and the rotation directions of the first screw belt and the second screw belt are opposite.

4. The conveying and cooling system for dried sludge according to claim 2, characterized in that: The flapping mechanism comprises a connecting rod for being fixedly connected to the rotating shaft, flapping plates are fixedly arranged at both ends of the connecting rod, and a plurality of finger teeth are arranged side by side at the free end of the flapping plate.

5. The conveying and cooling system for dried sludge according to claim 2, characterized in that: The first delivery cavity is also provided with a safety valve, and the safety valve is provided with a first pressure gauge.

6. The conveying and cooling system for dried sludge according to claim 1, characterized in that: The first delivery pipeline is provided with a ball valve and a second pressure gauge.

7. The conveying and cooling system for dried sludge according to claim 1, characterized in that: The second conveying pipeline is provided with a temperature measuring instrument.

8. The conveying and cooling system for dried sludge according to claim 1, characterized in that: The second screw conveyor includes a second conveying cavity, a screw shaft that passes through the second conveying cavity and is rotatably connected thereto, a reducer fixedly connected to the screw shaft via a coupling, and a three-phase asynchronous motor connected to the reducer. A feed port connected to the second conveying pipe is provided in the middle of the second conveying cavity, and discharge ports connected to a storage bin are provided at both ends of the second conveying cavity.

9. The conveying and cooling system for dried sludge according to claim 1, characterized in that: An ash hopper is arranged at the lower end of the dust collector, and an outlet of the ash hopper is communicated with a storage bin.

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