A sludge drying circulation structure and sludge drying system

Abstract

The present invention discloses a sludge drying circulation structure, comprising a support base, wherein the side wall of the support base is rotatably connected to a drying cylinder, a feed port is provided on the inner wall of the drying cylinder, an opening and closing door is installed in the feed port, a hot air trough is provided on the side wall of the support base, an air inlet is provided on the inner wall of the hot air trough, an electric heating device is provided in the hot air trough, and an axial flow fan is provided in the hot air trough; the present invention also proposes a sludge drying system, comprising a conveying module, a heat drying module, a sterilization module and a cooling module. The present invention provides components such as a drying cylinder, a baffle, a guide pipe, and a pipe network, so that when the axial flow fan transports a hot air flow to the guide pipe, the drying cylinder is synchronously driven to rotate, so that the sludge can be continuously transported to the top and then freely fall, so that the sludge can be spread over a larger area and fully contacted with the discharged hot air flow, thereby greatly improving the sludge drying efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field related to sludge drying, and in particular to a sludge drying circulation structure and a sludge drying system. Background Art

[0002] In the sewage treatment process, a large amount of sludge containing water is produced. When purifying the sludge, it is often necessary to first perform mechanical dehydration on the sludge (such as extrusion filtration by a filter press) and then perform thermal drying and dehydration treatment.

[0003] Currently, sludge drying mostly uses electric heating equipment to heat the air and dry the sludge through high-temperature airflow, such as the "A Sludge Drying Circulation Structure and Sludge Drying System" proposed with application number "202011230893.0". This scheme mainly uses hot air flow to continuously heat and dry the sludge on the conveyor belt. However, since the sludge on the conveyor belt is flat, the hot air flow only contacts the sludge surface. In order to improve the heating efficiency, the sludge can only be spread into a larger area as much as possible, resulting in a large conveyor belt area, which causes a series of problems such as large equipment size, wide floor space, and high requirements for power equipment to drive the conveyor belt. Moreover, the hot air flow always flows through the sludge surface, and its drying effect is very general. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a sludge drying circulation structure and a sludge drying system.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sludge drying circulation structure includes a support seat, the side wall of the support seat is rotatably connected to a drying cylinder, a feed port is provided on the inner wall of the drying cylinder, an opening and closing door is installed in the feed port, a hot air trough is provided on the side wall of the support seat, an air inlet is provided on the inner wall of the hot air trough, an electric heating device is provided in the hot air trough, an axial flow fan is provided in the hot air trough, the rotating shaft of the axial flow fan is connected to the drying cylinder through a speed reduction mechanism, a guide pipe is fixedly connected in the drying cylinder, and the guide pipe is communicated with the inside of the hot air trough, a plurality of baffles are fixedly connected at equal intervals on the inner wall of the drying cylinder, a pipe network is provided in the drying cylinder, the pipe network consists of a plurality of horizontal pipes and straight pipes, and an air supply device for supplying air to the interior of the guide pipe is installed in the guide pipe.

[0007] Preferably, the air supply device is fixedly connected to the air guide pipe on the guide pipe, the side wall of the guide pipe is provided with an exhaust hole, the side walls of the horizontal pipe and the straight pipe are provided with multiple air outlet holes, the horizontal pipe and the straight pipe are both made of soft rubber material, each of the horizontal pipes is connected to the straight pipe, the air guide pipe connects the pipeline network and the guide pipe, and the sum of the apertures of each air outlet hole is smaller than the diameter of the air guide pipe.

[0008] Preferably, a magnetic sliding plug is sealed and slidably connected inside the guide tube, two permanent magnets are embedded on the side wall of the guide tube, a connecting rod is provided inside the guide tube, an arc plate is fixedly connected to the side wall of the connecting rod, and the connecting rod passes through the rotating shaft of the axial flow fan and is fixedly connected to the inner wall of the hot air groove, and the magnetic sliding plug is elastically connected to the end of the connecting rod by a spring.

[0009] Preferably, the two permanent magnets are symmetrically distributed along the connecting rod, the magnetic poles of the two permanent magnets are symmetrically distributed along its vertical center line, and the magnetic poles of the two permanent magnets are arranged in opposite directions, and the two magnetic poles of the magnetic slider are symmetrically distributed along its horizontal center line.

[0010] Preferably, the central angle of the arc-shaped plate is greater than degrees, and the horizontal end surface of the arc-shaped plate is arranged to face upward.

[0011] The present invention also proposes a sludge drying system, including a conveying module, a heat drying module, a sterilization module and a cooling module. The conveying module is used to convey sludge, the heat drying module includes a heating module and an air supply module, the heating module is used to heat air, the air supply module is used to generate airflow, the sterilization module is used to sterilize the dried sludge, and the cooling module is used to cool the dried sludge.

[0012] The present invention has the following beneficial effects:

[0013] 1. By setting up the drying cylinder, baffles, guide pipes, pipe network and other components, the axial flow fan can simultaneously drive the drying cylinder to rotate when delivering hot air to the guide pipe, so that the sludge can be continuously transported to the top and then fall freely. This allows the sludge to spread over a larger area and fully contact with the discharged hot air flow, which can greatly improve the sludge drying efficiency;

[0014] 2. By setting up soft horizontal pipes and straight pipes and other components, the horizontal pipes and straight pipes can be continuously expanded and contracted under the action of the air supply device. In this way, when the sludge falls through the pipe network, it can be crushed into finer powder by the continuously expanding and contracting horizontal pipes and straight pipes, so that it can be more fully exposed to the hot air flow, thereby improving the drying efficiency of the sludge of this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a sludge drying cycle structure proposed by the present invention;

[0016] Figure 2 This is a schematic side cross-sectional view of a drying cylinder in a sludge drying circulation structure proposed by the present invention;

[0017] Figure 3 This is a schematic diagram of the top view of the pipe network in the sludge drying circulation structure proposed by the present invention;

[0018] Figure 4 for Figure 1 A schematic diagram of the structure enlargement at point A;

[0019] Figure 5 This is a system flow chart of a sludge drying system proposed in the present invention.

[0020] In the figure: 1 support base, 2 drying cylinder, 3 feed port, 4 opening and closing door, 5 exhaust hole, 6 hot air slot, 7 air inlet, 8 speed reduction mechanism, 9 guide pipe, 10 air guide pipe, 11 pipe network, 1101 horizontal pipe, 1102 straight pipe, 12 air outlet, 13 axial flow fan, 14 connecting rod, 15 curved plate, 16 permanent magnet, 17 magnetic sliding plug. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0023] Reference Figure 1-4 A sludge drying circulation structure includes a support base 1, the side wall of the support base 1 is rotatably connected to the drying cylinder 2, the inner wall of the drying cylinder 2 is provided with a feed port 3, and an opening and closing door 4 is installed in the feed port 3, the side wall of the support base 1 is provided with a hot air groove 6, and the inner wall of the hot air groove 6 is provided with an air inlet 7, an electric heating device is provided in the hot air groove 6, and an axial flow fan 13 is provided in the hot air groove 6. The rotating shaft of the axial flow fan 13 is connected to the drying cylinder 2 through a reduction mechanism 8. Specifically, the reduction mechanism 8 can adopt equipment such as a gear reducer. It only needs to transmit the torque of the axial flow fan 13 to the drying cylinder 2 to make the drying cylinder 2 rotate slowly. The specific structure, installation method and connection method between the reduction mechanism 8 and the rotating shaft of the axial flow fan 13 and the drying cylinder 2 are the same as the existing reduction mechanism, which is not related to this scheme and will not be described in detail.

[0024] A guide pipe 9 is fixedly connected to the drying cylinder 2, and the guide pipe 9 is communicated with the inside of the hot air trough 6. A plurality of baffles 201 are fixedly connected at equal intervals on the inner wall of the drying cylinder 2. A pipe network 11 is provided in the drying cylinder 2. The pipe network 11 consists of a plurality of horizontal pipes 1101 and straight pipes 1102. An air supply device for supplying air to the interior of the guide pipe 9 is installed.

[0025] The air supply device is fixedly connected to the air guide pipe 10 on the guide pipe 9. The side wall of the guide pipe 9 is provided with an exhaust hole 5. The side walls of the horizontal pipe 1101 and the straight pipe 1102 are provided with multiple air outlet holes 12. The horizontal pipe 1101 and the straight pipe 1102 are both made of soft rubber material. Each horizontal pipe 1101 is connected to the straight pipe 1102. The air guide pipe 10 connects the pipe network 11 and the guide pipe 9, and the sum of the apertures of the air outlet holes 12 is smaller than the diameter of the air guide pipe 10. A magnetic sliding plug 17 is sealed and slidably connected inside the guide pipe 9. The horizontal pipe 1101 and the straight pipe 1102 are vertically staggered and form a pipe network 11. Figure 3 shown.

[0026] Two permanent magnets 16 are embedded in the side walls of the flow guide tube 9. A connecting rod 14 is provided within the flow guide tube 9. A curved plate 15 is fixedly connected to the side wall of the connecting rod 14. The central angle of the curved plate 15 is greater than 120 degrees, and the horizontal end surface of the curved plate 15 is arranged to face upward. It should be noted that by providing the curved plate 15 with a central angle greater than 120 degrees and fixedly connected to the connecting rod 14, when the flow guide tube 9 rotates with the drying drum 2, the horizontal end surface of the curved plate 15 always faces upward, and the circumferential surface of the curved plate 15 always blocks the two lower air guide tubes 10, thereby forcing the hot air flow to be discharged only from the upper air guide tube 10. This can further concentrate the airflow discharge, so that when the sludge above falls, the upper pipe network 11 can discharge a relatively strong hot air flow, effectively and thoroughly drying the sludge.

[0027] The connecting rod 14 passes through the rotating shaft of the axial flow fan 13 and is fixedly connected to the inner wall of the hot air groove 6. The magnetic plug 17 is elastically connected to the end of the connecting rod 14 through a spring. The two permanent magnets 16 are symmetrically distributed along the connecting rod 14. The magnetic poles of the two permanent magnets 16 are symmetrically distributed along the vertical center line thereof, and the magnetic poles of the two permanent magnets 16 are set in opposite directions. The two magnetic poles of the magnetic plug 17 are symmetrically distributed along the horizontal center line thereof. Specifically, the magnetic pole distribution of the permanent magnet 16 and the magnetic plug 17 can be referred to Figure 4 As shown, when the flow guide tube 9 rotates, the permanent magnet 16 can periodically attract and repel the magnetic slider 17. Furthermore, the permanent magnet 16 and the magnetic slider 17 can be made of high-temperature resistant strong magnetic materials.

[0028] In the present invention, after opening the door 4, the sludge to be dried is fed into the drying drum 2 through the feed port 3, and then the door 4 is closed. At this point, the axial flow fan 13 and the electric heating device are activated to continuously generate a hot air flow, which is then continuously fed into the guide tube 9. The hot air flow is then fed into the pipe network 11 through the guide tube 10 and discharged through the air outlet 12 on the horizontal pipe 1101 and the straight pipe 1102.

[0029] During this process, when the axial flow fan 13 rotates, its rotating shaft will also drive the drying cylinder 2 to rotate slowly through the speed reduction mechanism 8, and the sludge falling into the drying cylinder 2 will be at the bottom of the drying cylinder 2 and between two adjacent baffles 201. When the drying cylinder 2 rotates slowly, the baffle 201 can continuously push the sludge to the top of the drying cylinder 2. After being pushed to the top of the drying cylinder 2, the sludge can be continuously sprinkled down piece by piece by its own weight (the water content of the sludge after mechanical dehydration is lower, so the sludge is in a solid state instead of a fluid state at this time). When the sludge is sprinkled down, it will continuously pass through the pipe network 11, so that it can fully contact with the hot air flow discharged from the air outlet 12. In this way, the hot air flow will thoroughly dry the sludge, greatly improving the drying efficiency. Compared with the drying method of spreading the sludge as flat as possible on the conveyor belt, the drying equipment of this device has a simple structure, a small footprint, and low requirements for power equipment.

[0030] What is more prominent is that, since the magnetic slider 17 is connected to the connecting rod 14 by a spring, and the connecting rod 14 is fixedly set on the inner wall of the hot air groove 6, the magnetic slider 17 does not rotate with the guide tube 9. When the guide tube 9 rotates with the drying cylinder 2, the two different magnetic poles of the two permanent magnets 16 will continuously face the two magnetic poles of the magnetic slider 17, and the permanent magnets 16 will continuously attract and repel the magnetic slider 17. Under the magnetic force, the magnetic slider 17 will move back and forth.

[0031] When the magnetic slide 17 moves to the left side of the exhaust hole 5, the hot air flow into the guide pipe 9 cannot be discharged from the exhaust hole 5, and can only flow into the pipe network 11 through the air guide pipe 10 and be discharged from the air outlet holes 12. Because the sum of the apertures of all the air outlet holes 12 is smaller than the diameter of the air guide pipe 10, the exhaust volume is smaller than the intake volume of the air guide pipe 10 at this time, and the internal pressure of the horizontal pipe 1101 and the straight pipe 1102 made of soft rubber increases, and expansion may occur. Figure 3 In the dotted line form, the mesh aperture of the pipe network 11 is reduced; and when the magnetic slide 17 moves right to the right side of the exhaust hole 5, a part of the air flow is discharged from the exhaust hole 5, and the air intake of the air duct 10 is reduced. At this time, the exhaust volume of each air outlet 12 is the same as the air intake of the air duct 10, so the internal air pressure of the horizontal pipe 1101 and the straight pipe 1102 is reduced, and can be restored by their own elastic force, so the mesh aperture of the pipe network 11 is also restored.

[0032] In summary, as the hot air flow continues to flow in the guide pipe 9 and the drying cylinder 2 continues to rotate, the horizontal tubes 1101 and the straight tubes 1102 continue to expand and contract, and the mesh aperture of the pipe network 11 will also periodically increase and decrease accordingly. In this way, when the sludge above continues to pass through the pipe network 11, it can be crushed into finer powder by the pipe network 11 with constantly changing mesh apertures, further increasing the contact area between the sludge and the hot air flow, thereby improving the drying efficiency of the sludge of this device.

[0033] Reference Figure 5 The present invention also proposes a sludge drying system, including a conveying module, a heat drying module, a sterilization module and a cooling module. The conveying module is used to convey sludge. The heat drying module includes a heating module and an air supply module. The heating module is used to heat air, the air supply module is used to generate airflow, the sterilization module is used to sterilize the dried sludge, and the cooling module is used to cool the dried sludge.

[0034] Specifically, the conveying module conveys the sludge to the heat drying module, where it is heated and dried by hot air flow, then conveyed to the sterilization module for sterilization, and finally cooled by the cooling module before being discharged.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sludge drying circulation structure, comprising a support base (1), characterized in that: The side wall of the support seat (1) is rotatably connected to a drying cylinder (2), a feed port (3) is provided on the inner wall of the drying cylinder (2), an opening and closing door (4) is installed in the feed port (3), a hot air groove (6) is provided on the side wall of the support seat (1), an air inlet (7) is provided on the inner wall of the hot air groove (6), an electric heating device is provided in the hot air groove (6), an axial flow fan (13) is provided in the hot air groove (6), and the rotating shaft of the axial flow fan (13) is reduced by The speed mechanism (8) is connected to the drying cylinder (2), a guide pipe (9) is fixedly connected to the inside of the drying cylinder (2), and the guide pipe (9) is communicated with the inside of the hot air groove (6), a plurality of baffles (201) are fixedly connected at equal intervals on the inner wall of the drying cylinder (2), a pipe network (11) is provided in the drying cylinder (2), and the pipe network (11) is composed of a plurality of horizontal pipes (1101) and straight pipes (1102), and an air supply device for supplying air to the inside of the guide pipe (9) is installed in the guide pipe (9); The air supply device is fixedly connected to the air guide pipe (10) on the guide pipe (9); the side wall of the guide pipe (9) is provided with an exhaust hole (5); the side walls of the transverse pipe (1101) and the straight pipe (1102) are provided with a plurality of air outlet holes (12); the transverse pipe (1101) and the straight pipe (1102) are both made of soft rubber material; each of the transverse pipes (1101) is in communication with the straight pipe (1102); the air guide pipe (10) is in communication with the pipe network (11) and the guide pipe (9); and the sum of the apertures of the air outlet holes (12) is smaller than the diameter of the air guide pipe (10); A magnetic sliding plug (17) is sealed and slidably connected inside the guide tube (9), two permanent magnets (16) are embedded on the side wall of the guide tube (9), a connecting rod (14) is provided inside the guide tube (9), an arc plate (15) is fixedly connected to the side wall of the connecting rod (14), and the connecting rod (14) passes through the rotating shaft of the axial flow fan (13) and is fixedly connected to the inner wall of the hot air groove (6), and the magnetic sliding plug (17) is elastically connected to the end of the connecting rod (14) through a spring; The two permanent magnets (16) are symmetrically distributed along the connecting rod (14), the magnetic poles of the two permanent magnets (16) are symmetrically distributed along the vertical center line thereof, and the magnetic poles of the two permanent magnets (16) are arranged in opposite directions, and the two magnetic poles of the magnetic slider (17) are symmetrically distributed along the horizontal center line thereof; When the magnetic sliding plug (17) moves to the left side of the exhaust hole (5), the hot air flow into the air guide pipe (9) cannot be discharged from the exhaust hole (5), and can only flow into the pipe network (11) through the air guide pipe (10) and be discharged from each air outlet (12); when the magnetic sliding plug (17) moves to the right side of the exhaust hole (5), a part of the air flow is discharged from the exhaust hole (5), and the air intake of the air guide pipe (10) is reduced. At this time, the exhaust volume of each air outlet (12) is the same as the air intake of the air guide pipe (10).

2. A sludge drying circulation structure according to claim 1, characterized in that: The central angle of the arc-shaped plate (15) is greater than (120) degrees, and the horizontal end surface of the arc-shaped plate (15) is arranged upward.

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