A sewage treatment plant sludge sectional drying device

Abstract

The application discloses a sewage treatment plant sludge segmented drying device, relates to the technical field of sludge drying, and comprises a combustion furnace and an electric control box. The combustion furnace is used for guiding and conveying hot air flow into a drying mechanism through a high-heat-conduction cylinder, a first hot air flow conveying pipe and a second hot air flow conveying pipe. An impurity scraping mechanism is arranged on the second hot air flow conveying pipe. A rotating shaft is rotatably arranged in the drying mechanism. First stirring rods and second stirring rods are arranged on the drying mechanism in an alpha angle along the axial direction of the rotating shaft. First stirring blades and second stirring blades are arranged on the top of the first stirring rods and the second stirring rods. The second stirring blades are arranged in a beta angle along the horizontal plane of the axial direction of the rotating shaft. The application can consider axial conveying and radial mixing, avoid the long-time local residence of sludge in the stirring device, consider the three functions of conveying, dispersing and turning, classify the particle size during the sludge drying process, perform the moisture content gradient drying on the sludge, and perform dynamic screening and continuous transition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge drying, in particular to a sectional sludge drying device for sewage treatment plants. BACKGROUND

[0002] A large amount of sludge generated by sewage treatment plants cannot be directly utilized due to high water content and needs to be treated by drying to reduce the water content. The traditional drying method has low efficiency and is greatly affected by the weather. The existing drum drying equipment has the following defects:

[0003] Low thermal efficiency. The direct contact between hot air and sludge material cannot achieve effective utilization of concentrated and uniform heat. In the prior art, single helical blade or paddle blade structures are mostly used, but these structures have the following problems: single helical blade: strong axial propulsion ability, but weak radial shear, easy to form a "dead zone" near the cylinder wall, leading to local overheating and caking of the sludge; paddle blade: good radial disturbance, but weak axial propulsion, and the particles are easily scattered in the late drying stage, producing a large amount of dust. In addition, the subsequent ability to break up and push the sludge rapidly decreases after the sludge sticks to the surface of the blade, and periodic manual cleaning is required, which seriously affects continuous production.

[0004] Mixing dead angle. Single-direction blades cannot simultaneously consider axial transportation and radial mixing, and the sludge stays in the local area for too long. It cannot simultaneously consider transportation, breaking up, and turning.

[0005] Uneven drying. The sludge material is prone to caking or sticking to the wall, leading to local over-drying or under-drying.

[0006] During the conduction of high-temperature hot gas generated by the combustion furnace, the hot air flow needs to be transported into the position of the inlet of the air duct guide shell of the drying device. Since biomass fuel is the main fuel source for the combustion furnace, impurities will accumulate at the turning position of the second hot air flow during the combustion process. In the long-term use process, these impurities will layer by layer accumulate and cover, stubbornly adhere to the turning position of the second hot air flow, causing the conduction of high-temperature hot gas and the unsmooth airflow of the second hot air flow, increasing the production cost and being not conducive to the production activities. The present application is aimed at solving this problem.

[0007] Therefore, the present application provides a sectional sludge drying device for sewage treatment plants. SUMMARY

[0008] The sewage treatment plant sludge segmented drying device can consider axial conveying and radial mixing, avoid long local residence time of sludge in the stirring device, consider conveying, scattering and turning, can size the particle size during sludge drying, perform gradient drying on sludge, perform dynamic screening and continuous transition, the screening disc and the transition screen are arranged, the particle size of sludge passing through the third drying chamber, the second drying chamber and the first drying chamber can be sequentially reduced, so that the particle size grading and dynamic screening are realized, and the grading drying operation is realized, the air duct is arranged for heat transfer drying through the hot air flow, so that the material is concentrated and dried, the first stirring rod, the second stirring rod, the first stirring blade and the second stirring blade are arranged, the sludge can be scattered and stirred, the sludge material is prevented from caking or sticking to the wall, local over-drying or under-drying is avoided, so that the drying operation is better realized, the high-temperature hot gas generated by the combustion furnace can be conducted to the position of the air duct guide shell inlet of the drying device, the impurity scraping device is arranged, the structure is simple, the inner wall of the second hot air flow conveying pipe is scraped by the swinging of the scraper to remove impurities, and the smoothness of the high-temperature hot gas conduction airflow of the second hot air flow conveying is avoided.

[0009] To achieve the above object, the technical scheme adopted by the present application is:

[0010] A sewage treatment plant sludge segmented drying device, comprising a combustion furnace and an electric control box, the combustion furnace is connected with the high heat conduction cylinder, the first hot air flow conveying pipe and the second hot air flow conveying pipe, and the hot air flow is guided and conveyed into the drying mechanism, the second hot air flow conveying pipe is provided with an impurity scraping mechanism for cleaning the impurities on the inner wall of the second hot air flow conveying pipe, a rotating shaft is rotationally arranged in the drying mechanism, the first stirring rod and the second stirring rod are arranged at an alpha angle along the axial direction of the rotating shaft, the first stirring blade and the second stirring blade are arranged at the top of the first stirring rod and the second stirring rod respectively, the second stirring blade is arranged at a beta angle along the horizontal plane of the axial direction of the rotating shaft, the rotating shaft passes through the third drying chamber, the second drying chamber and the first drying chamber in sequence, and the first stirring blade and the second stirring blade are in the shape of a rake tooth structure.

[0011] As a further improvement of the above scheme, the alpha angle is 120-160°, the beta angle is 45°, the rotating shaft is in the shape of a hollow pipe, and one end of the rotating shaft close to the side baffle is arranged in the bearing seat, and the other end of the rotating shaft passes through the roller to connect the speed reducer and the motor.

[0012] As a further improvement of the above-mentioned scheme, the third drying chamber and the second drying chamber are arranged between the screen plate, the third drying chamber and the second drying chamber are arranged in the inner cylinder, the inner cylinder is arranged in the outer cylinder, the outer cylinder is arranged with the air duct guide shell and the air inlet near the side of the side baffle, the air inlet is connected with one end of the second hot air flow conveying pipe, the outer cylinder is arranged with the support frame outside, and the top of the outer cylinder is arranged with the top cover plate.

[0013] As a further improvement of the above-mentioned scheme, the second drying chamber and the first drying chamber are arranged between the transition screen, the first drying chamber is arranged in the roller, the transition screen is arranged on the lower inner wall of the inner cylinder side end, and the transition screen side is arranged with the blocking ring in the roller.

[0014] As a further improvement of the above-mentioned scheme, the high heat conduction cylinder is arranged directly above the combustion furnace, the high heat conduction cylinder is arranged with the first support outside, and the impurity scraping mechanism includes the scraper plate in the arc plate structure swinging along the inner wall of the second hot air flow conveying pipe.

[0015] As a further improvement of the above-mentioned scheme, the sliding block is movably arranged in the guide frame, the guide frame is in the arc hollow block structure, the sliding block can swing in the arc line along the guide frame, and the two ends of the guide frame are connected with the inner support piece.

[0016] As a further improvement of the above-mentioned scheme, the sliding block side is arranged with the swing rod, the swing rod is hinged with the hinge seat on the electric control box, the end of the swing rod away from the hinge seat is hinged with the telescopic end of the electric push rod, and the seat body of the electric push rod is hinged and arranged on the second support.

[0017] As a further improvement of the above-mentioned scheme, the sliding block swings to the lowest position of the inner wall of the second hot air flow conveying pipe to arrange the slag discharge port, the bottom of the slag discharge port is hinged and arranged with the movable plate on the outer wall of the movable plate, and the swing rod is arranged with the folding plate at the gap position of the second hot air flow conveying pipe.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] The axial conveying and radial mixing can be considered, the sludge can be prevented from staying in the stirring device for too long, the conveying, scattering and turning functions can be considered, the particle size grading in the sludge drying process can be considered, the sludge can be dried in the water content gradient, the dynamic screening and continuous transition can be considered, the screen plate and the transition screen are arranged, the particle size of the sludge passing through the third drying chamber, the second drying chamber and the first drying chamber can be sequentially reduced, so that the particle size grading and dynamic screening are realized, the grading drying operation is realized, the air duct is arranged for the hot air flow to pass through the heat transfer drying, so that the material is concentrated for drying, and the β included angle of 45° can better push the material for conveying and transferring.

[0020] Equipped with a first stirring rod, a second stirring rod, a first stirring blade, and a second stirring blade, it can break up and stir the sludge to prevent the sludge material from clumping or sticking to the wall, and avoid local over-drying or under-drying, thereby better achieving the drying operation. It can also transfer the high-temperature hot air generated by the combustion furnace to the inlet of the air duct guide shell of the drying device.

[0021] Equipped with an impurity scraping device, the device has a simple structure. By swinging the scraper, it scrapes impurities off the inner wall of the second hot air delivery pipe, thus preventing obstruction of the high-temperature hot air conduction flow in the second hot air delivery pipe. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the drying mechanism of the present invention.

[0024] Figure 3 This is a three-dimensional structural diagram of the location of the second drying chamber in this invention.

[0025] Figure 4 This is a schematic diagram of the main structure of the drying mechanism of the present invention.

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the rotating shaft of the present invention.

[0027] Figure 6 This is a three-dimensional structural diagram of the location of the second stirring blade in this invention.

[0028] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at the CC position.

[0029] Figure 8 This is a three-dimensional structural diagram of the first stirring blade position of the present invention.

[0030] Figure 9 This is a front view structural diagram of the impurity scraping mechanism of the present invention.

[0031] Figure 10 This is a front view schematic diagram of the scraper of the present invention in an arc-shaped motion state.

[0032] Figure 11 for Figure 9 A magnified view of a portion of location A in the middle.

[0033] Figure 12 for Figure 10 A magnified view of a portion of the area at position B.

[0034] Figure 13 This is a schematic diagram of the three-dimensional structure of the guide frame of the present invention.

[0035] Figure 14 This is a three-dimensional structural diagram of the scraper location of the present invention.

[0036] The text labels in the diagram represent: 1. Combustion furnace; 2. First support; 3. High-temperature heat conduction cylinder; 4. First hot air flow conveying pipe; 5. Second hot air flow conveying pipe; 6. Impurity scraping mechanism; 7. Second support; 8. Drying mechanism; 9. Electrical control box; 601. Inner support plate; 602. Sliding block; 603. Scraper; 604. Guide frame; 605. Swing rod; 606. Hinge seat; 607. Electric push rod; 608. Movable plate; 609. Slag discharge port; 610. Folding plate; 801. Outer cylinder; 802. Shaft. 803. Air inlet; 804. Air duct guide shell; 805. Side baffle; 806. Support frame; 807. Top cover plate; 808. Inner cylinder; 809. First stirring blade; 810. First stirring rod; 811. Second stirring blade; 812. Second stirring rod; 813. Screening disc; 814. Rotating shaft; 815. Transition screen; 816. Baffle ring; 817. First drying chamber; 818. Second drying chamber; 819. Third drying chamber; 820. Reducer; 821. Motor; 822. Drum. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0038] like Figures 1-14As shown, the specific solution of this embodiment is as follows: a sludge segmented drying device for a sewage treatment plant, including a combustion furnace 1 and an electrical control box 9. The combustion furnace 1 guides and transports hot air to the drying mechanism 8 through a high-heat conduction cylinder 3, a first hot air flow conveying pipe 4, and a second hot air flow conveying pipe 5. The second hot air flow conveying pipe 5 is provided with an impurity scraping mechanism 6 for cleaning impurities on the inner wall of the second hot air flow conveying pipe 5. A rotating shaft 814 is rotatably arranged inside the drying mechanism 8. A first stirring rod 810 and a second stirring rod 812 are arranged at an angle α along the axial direction of the rotating shaft 814 on the drying mechanism 8. A first stirring blade 809 and a second stirring blade 811 are respectively provided at the top of the first stirring rod 810 and the second stirring rod 812. The second stirring blade 811 is arranged at an angle β with the horizontal plane along the axial direction of the rotating shaft 814. The rotating shaft 814 passes sequentially through the third drying chamber 819, the second drying chamber 818, and the first drying chamber 817. The first stirring blade 809 and the second stirring blade 811 have a rake-tooth structure, the purpose of which is to better disperse the material. The temperatures of the third drying chamber 819, the second drying chamber 818, and the first drying chamber 817 are controlled at 300℃, 250℃, and 200℃, respectively. In the third drying chamber 819, the temperature is controlled at 300℃, and the moisture content of the material is reduced to 70%. In the second drying chamber 818, the temperature is controlled at 250℃, and the moisture content of the material is reduced to 50%. In the first drying chamber 817, the temperature is controlled at 200℃, and the moisture content of the material is reduced to 30%. Temperature sensors are installed in the third drying chamber 819, the second drying chamber 818, and the first drying chamber 817 to detect the temperature.

[0039] More specifically, the hot airflow generated at the combustion furnace 1 passes sequentially through the high heat conduction cylinder 3, the first hot airflow conveying pipe 4, the second hot airflow conveying pipe 5, and the air inlet 803. An outer cylinder 801 and an inner cylinder 808 are coaxially fitted together, with a duct between them for the hot airflow. The inner wall of the outer cylinder 801 is lined with heat-insulating material. Hot airflow is introduced from the air inlet 803, passes through the duct guide shell 804, and enters the duct for heat transfer and drying. It then enters the first drying chamber 817, undergoing heat transfer in the opposite direction of material transport. The drum 822 has airflow holes for the hot airflow. The sludge material sequentially passes through the third drying chamber 819, the second drying chamber 818, and the first drying chamber 817 for grading and drying. The screening disc 8... Multiple rectangular screen holes are set on screen 13, and multiple circular screen holes are set on transition screen 815. The sludge material screened at the position of transition screen 815 enters the drum 822. The setting of screening disc 813 and transition screen 815 divides the entire drying process into different particle sizes and dynamic screening. Screening disc 813 rotates with rotating shaft 814. First stirring rod 810, second stirring rod 812, first stirring blade 809, and second stirring blade 811 can perform sludge dispersing and stirring operations. First stirring blade 809 and second stirring blade 811 are set at a certain inclined angle, which can dispersing and stirring operations of sludge while promoting sludge material to move along the axial direction of rotating shaft 814 until the sludge material is smaller than the screen holes of screening disc 813 and transition screen 815 before it can pass through.

[0040] As a preferred embodiment of the above, the included angle α is 120-160°, the included angle β is 45°, the rotating shaft 814 has a hollow tubular structure and one end of it near the side baffle 805 is disposed in the bearing seat 802, and the other end of it passes through the roller 822 and connects to the reducer 820 and the motor 821.

[0041] As a preferred embodiment of the above, a screening disc 813 is provided between the third drying chamber 819 and the second drying chamber 818. The third drying chamber 819 and the second drying chamber 818 are located inside the inner cylinder 808. The inner cylinder 808 is located inside the outer cylinder 801. An air duct guide shell 804 and an air inlet 803 are provided on the side of the outer cylinder 801 near the side baffle 805. The air inlet 803 is connected to one end of the second hot air flow conveying pipe 5. A support frame 806 is provided on the outside of the outer cylinder 801. A top cover plate 807 is provided on the top of the outer cylinder 801.

[0042] As a preferred embodiment of the above, a transition screen 815 is provided between the second drying chamber 818 and the first drying chamber 817. The first drying chamber 817 is located inside the drum 822, and the transition screen 815 is located on the lower inner wall of the inner cylinder 808. A retaining ring 816 is provided on the side of the transition screen 815 and inside the drum 822.

[0043] As a preferred embodiment of the above, the high heat conduction cylinder 3 is disposed directly above the combustion furnace 1, and a first support 2 is disposed outside the high heat conduction cylinder 3. The impurity scraping mechanism 6 includes a scraper 603 with an arc-shaped plate structure that swings along the inner wall of the second hot air flow pipe 5. A sliding block 602 is connected to the side of the scraper 603 away from the second hot air flow pipe 5.

[0044] As a preferred embodiment of the above, the sliding block 602 is movably disposed within the guide frame 604. The guide frame 604 has an arc-shaped hollow block structure. The sliding block 602 can swing along the guide frame 604 in an arc. Both ends of the guide frame 604 are connected to inner support plates 601, which are disposed on the inner wall of the second hot air flow delivery pipe 5.

[0045] As a preferred embodiment of the above, a swing rod 605 is provided on the side of the sliding block 602. The swing rod 605 is hinged to the hinge seat 606 on the electrical control box 9. The end of the swing rod 605 away from the hinge seat 606 is hinged to the telescopic end of the electric push rod 607. The seat of the electric push rod 607 is hinged to the second bracket 7.

[0046] As a preferred embodiment of the above, the sliding block 602 swings to the lowest position of the inner wall of the second hot air flow pipe 5 and a slag discharge port 609 is provided. The bottom of the slag discharge port 609 and the movable plate 608 are hinged to the outer wall of the movable plate 608. The swing rod 605 passes through the gap position of the second hot air flow pipe 5 and a folding plate 610 is provided.

[0047] More specifically, the electric push rod 607 is driven, and the telescopic shaft end of the electric push rod 607 pushes the swing rod 605 to swing around the swing rod 605. The scraper 603 moves along the inner wall of the second hot air flow pipe 5 to scrape away impurities. The guide frame 604 guides the swinging motion of the sliding block 602. The structure is simple, convenient and practical. The guide frame 604 is set to guide the swinging motion of the sliding block 602. The folding plate 610 is set to isolate the inside and outside at the gap position through which the swing rod 605 swings during the swinging process.

[0048] The specific working principle of this invention is as follows:

[0049] The hot airflow generated at the combustion furnace 1 passes sequentially through the high-heat conduction cylinder 3, the first hot airflow conveying pipe 4, the second hot airflow conveying pipe 5, the air inlet 803, the coaxially mounted second stirring blade 811, and the inner cylinder 808. A duct is provided between these two for the hot airflow to pass through. Hot airflow is introduced from the air inlet 803 and enters the duct through the duct guide shell 804 for heat transfer and drying. The sludge material sequentially passes through the third drying chamber 819, the second drying chamber 818, and the first drying chamber 817 for graded drying. Multiple rectangular screen holes are provided on the screening disc 813, and multiple circular screen holes are provided on the transition screen 815. The sludge material to be screened enters the drum 822. The setting of the screening disc 813 and the transition screen 815 divides the entire drying process into different particle sizes and dynamic screening. The screening disc 813 rotates with the rotating shaft 814. The first stirring rod 810, the second stirring rod 812, the first stirring blade 809, and the second stirring blade 811 can disperse and agitate the sludge. The first stirring blade 809 and the second stirring blade 811 are set at a certain angle, which can disperse and agitate the sludge while causing the sludge material to move along the axial direction of the rotating shaft 814 until the sludge material is smaller than the screen holes of the screening disc 813 and the transition screen 815 before it can pass through.

[0050] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A segmented sludge drying device for wastewater treatment plants, characterized in that, The combustion furnace (1) and electrical control box (9) are included. The combustion furnace (1) guides and transports hot air to the drying mechanism (8) through the high heat conduction cylinder (3), the first hot air flow conveying pipe (4), and the second hot air flow conveying pipe (5). An impurity scraping mechanism (6) is provided on the inner wall of the second hot air flow conveying pipe (5). A rotating shaft (814) is rotatably installed inside the drying mechanism (8). A first stirring rod (810) and a second stirring rod (810) are arranged at an angle α along the axial direction of the rotating shaft (814) on the drying mechanism (8). 812), the top of the first stirring rod (810) and the second stirring rod (812) are respectively provided with a first stirring blade (809) and a second stirring blade (811). The second stirring blade (811) is set at an angle β with the horizontal plane along the axial direction of the rotation axis (814). The rotation axis (814) passes through the third drying chamber (819), the second drying chamber (818), and the first drying chamber (817) in sequence. The first stirring blade (809) and the second stirring blade (811) have a rake tooth structure. The angle α The angle is 120-160°, the included angle is 45°, the rotating shaft (814) is a hollow tubular structure and one end of it near the side baffle (805) is set in the bearing seat (802), and the other end passes through the roller (822) to connect the reducer (820) and the motor (821). The high heat conduction cylinder (3) is set directly above the combustion furnace (1), and the high heat conduction cylinder (3) is provided with a first support (2) on the outside. The impurity scraping mechanism (6) includes an arc-shaped plate that swings along the inner wall of the second hot air flow conveying pipe (5). The scraper (603) has a shape-like structure. The side of the scraper (603) away from the second hot air flow delivery pipe (5) is connected to a sliding block (602). The sliding block (602) is movably disposed in the guide frame (604). The guide frame (604) has an arc-shaped hollow block structure. The sliding block (602) can swing along the guide frame (604) in an arc. Both ends of the guide frame (604) are connected to inner support plates (601). The inner support plates (601) are disposed on the inner wall of the second hot air flow delivery pipe (5).

2. The sludge staged drying device for wastewater treatment plants according to claim 1, characterized in that, A screening plate (813) is provided between the third drying chamber (819) and the second drying chamber (818). The third drying chamber (819) and the second drying chamber (818) are located inside the inner cylinder (808). The inner cylinder (808) is located inside the outer cylinder (801). An air duct guide shell (804) and an air inlet (803) are provided on the side of the outer cylinder (801) near the side baffle (805). The air inlet (803) is connected to one end of the second hot air flow conveying pipe (5). A support frame (806) is provided outside the outer cylinder (801). A top cover plate (807) is provided on the top of the outer cylinder (801).

3. The sludge staged drying device for wastewater treatment plants according to claim 1, characterized in that, A transition screen (815) is provided between the second drying chamber (818) and the first drying chamber (817). The first drying chamber (817) is located inside the drum (822). The transition screen (815) is located on the lower inner wall of the side end of the inner cylinder (808). A retaining ring (816) is provided on the side of the transition screen (815) and inside the drum (822).

4. The sludge staged drying device for wastewater treatment plants according to claim 1, characterized in that, The sliding block (602) is provided with a swing rod (605) on its side. The swing rod (605) is hinged to the hinge seat (606) on the electrical control box (9). The end of the swing rod (605) away from the hinge seat (606) is hinged to the telescopic end of the electric push rod (607). The seat of the electric push rod (607) is hinged on the second bracket (7).

5. A segmented sludge drying device for a wastewater treatment plant according to claim 4, characterized in that, The sliding block (602) swings to the lowest position of the inner wall of the second hot air flow pipe (5) to set a slag discharge port (609). The bottom of the slag discharge port (609) and the movable plate (608) are hinged to the outer wall of the movable plate (608). The swing rod (605) passes through the gap position of the second hot air flow pipe (5) and a folding plate (610) is set.

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