A microwave pyrolysis sludge device

Abstract

The application provides a sludge microwave pyrolysis device, belonging to the technical field of sludge treatment, comprising a tunnel furnace and a conveying belt arranged in the tunnel furnace, and a supporting frame and a feeding hopper are arranged at the feeding end of the tunnel furnace; two hollow extrusion rollers are rotatably connected to the supporting frame, and the gap between the two extrusion rollers is located directly below the feeding hopper; the left extrusion roller is made of microporous material; a negative pressure suction pipe that can communicate with an external suction pump is arranged on the supporting frame, and the suction end of the negative pressure suction pipe is located in the left extrusion roller; a preheating assembly that can heat sludge is arranged in the right extrusion roller, and is used for assisting in removing water in the sludge; a driving assembly is arranged on the supporting frame, and is used for driving the two extrusion rollers to rotate and extruding the sludge; and the application can reduce the probability of the influence of the excessive water in the sludge on the microwave pyrolysis work.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of sludge treatment, and in particular to a microwave pyrolysis sludge device. BACKGROUND

[0002] Sludge treatment refers to a processing process of sludge concentration, conditioning, dewatering, stabilization, drying or incineration and the like for reduction, stabilization and harmless treatment. For a modern sewage treatment plant, sludge treatment and disposal has become the most complex and highest-cost part in the operation of the sewage treatment system. Microwave pyrolysis technology is a new sludge treatment technology, which is to heat sludge through microwave energy to decompose organic matter in the sludge, so as to realize harmless treatment and resource utilization of the sludge.

[0003] Referring to the Chinese patent document with the publication number CN109665687B and the publication date of November 26, 2021, and the name of a kind of oily sludge treatment system, by setting the feed deoxygenation bin to reduce the oxygen content of the material, so that the pyrolysis work can be carried out in the absence of oxygen, and then under the cooperation of the horizontal conveying device, the material can be uniformly heated and pyrolyzed in the main and auxiliary microwave pyrolysis furnace, the uniformity of the material heating and pyrolysis is improved, and the efficiency of the pyrolysis work is improved.

[0004] Referring to the above technical solution, since the sludge is a mixture formed after the pollutants such as domestic sewage and industrial wastewater are subjected to sedimentation and concentration, the sludge often contains a large amount of water, and the effective pyrolysis temperature of the sludge is usually higher than the evaporation temperature of the water, so in the actual treatment process, the excessive water in the sludge often absorbs microwave energy first and evaporates, at this time, a large amount of microwave energy is used for water evaporation, which increases the energy consumption and may affect the efficiency of the microwave pyrolysis work. SUMMARY

[0005] Therefore, the application provides a microwave pyrolysis sludge device, which is mainly used to solve the problem that excessive water contained in the sludge easily increases the energy consumption of the microwave pyrolysis work.

[0006] To solve the above technical problems, the application provides a microwave pyrolysis sludge device, which comprises a tunnel furnace and a conveying belt arranged in the tunnel furnace, and a supporting frame and a feeding hopper are arranged at the feeding end of the tunnel furnace; two hollow extrusion rollers are rotatably connected to the supporting frame, and the gap between the two extrusion rollers is located directly below the feeding hopper; the left extrusion roller is made of microporous material; a negative pressure suction pipe that can communicate with an external suction pump is arranged on the supporting frame, and the suction end of the negative pressure suction pipe is located in the left extrusion roller; a preheating assembly that can heat the sludge is arranged in the right extrusion roller, and is used to assist in removing the water in the sludge; and a driving assembly is arranged on the supporting frame, and is used to drive the two extrusion rollers to rotate and extrude the sludge.

[0007] Through the above technical scheme, the extrusion roller, the negative pressure suction pipe and the preheating assembly cooperate to extrude, negatively suck and heat the sludge, so that the excess water in the sludge is discharged.

[0008] Optionally, a plurality of annular grooves are arranged on the outer surfaces of the two extrusion rollers in an axial array, and the annular grooves on the two extrusion rollers are arranged in an interval on the axial reference.

[0009] Through the above technical scheme, the sludge can be converted into a plurality of strip-shaped individuals, so that the sludge can more effectively absorb microwave energy.

[0010] Optionally, the preheating assembly comprises a heat supply pipe that communicates with the middle part of the tunnel furnace, an induced draft fan that is arranged at the communication position of the tunnel furnace and the heat supply pipe and is used to supply heat to the heat supply pipe, and an air outlet of the heat supply pipe is connected to the inner cavity of the right extrusion roller through a rotary joint.

[0011] Through the above technical scheme, the heat in the tunnel furnace can be circulated and used as a heat source for preheating the sludge, so that the purpose of energy saving is achieved.

[0012] Optionally, the driving assembly comprises a servo motor arranged on the supporting frame and used to drive the extrusion rollers to rotate, gears arranged at the rear ends of the two extrusion rollers, and the two gears are meshed with each other.

[0013] Through the above technical scheme, when the servo motor drives one extrusion roller to rotate, the two extrusion rollers can rotate in opposite directions to extrude the sludge through the cooperation of the two gears.

[0014] Optionally, the suction end of the negative pressure suction pipe is arranged close to the right extrusion roller, so that the negative pressure suction force of the negative pressure suction pipe is concentrated in the gap between the two extrusion rollers.

[0015] Through the above technical scheme, the sludge in the extrusion process can be subjected to a stronger negative pressure suction force, so that the extruded water can be effectively sucked away.

[0016] Optionally, the support frame is vertically slidably connected to the feeding end of the tunnel furnace via an elastic element, and both extrusion rollers are equipped with a shaking component to shake off the residual sludge on the extrusion rollers.

[0017] Optionally, the shaking component includes multiple arc-shaped grooves circumferentially arrayed at the front and rear ends of the two extrusion rollers, and each arc-shaped groove is filled with multiple impact blocks that can collide with the inner wall of the arc-shaped groove when the extrusion roller rotates.

[0018] By adopting the above technical solution, the impact block can follow the extrusion roller in circumferential displacement during the rotation of the extrusion roller. At the same time, the impact block will collide with the inner wall of the arc groove due to gravity, generating vibration and impact, causing the extrusion roller and the support frame to shake to a certain extent, so as to shake off the sludge remaining on the extrusion roller.

[0019] Optionally, the bottom end of the support frame is provided with two linkage rollers that can respectively abut against the inner and outer surfaces of the conveyor belt, and the linkage rollers can move vertically together with the support frame.

[0020] By adopting the above technical solution, the vibration generated on the extrusion roller can be transmitted to the conveyor belt, so that the sludge on the conveyor belt is in motion, which is conducive to the sludge absorbing microwave energy.

[0021] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0022] 1. Before microwave pyrolysis begins, use a combination of squeezing, suction, and preheating to remove as much excess moisture as possible from the sludge, thereby reducing the possibility that excessive moisture in the sludge will affect the efficiency of microwave pyrolysis.

[0023] 2. During the extrusion process, the shearing force generated by the extrusion rollers can transform the sludge into multiple strip-shaped individuals, enabling the sludge to absorb microwave energy more quickly and effectively, thereby improving the efficiency of microwave pyrolysis.

[0024] 3. By adding impact components to the extrusion roller, vibration is generated when the extrusion roller squeezes the sludge. This not only improves the extrusion and dewatering effect of the extrusion roller, but also promotes the removal of sludge adhering to the extrusion roller, which is beneficial to the continuous use of the extrusion roller.

[0025] 4. It can transmit the vibration generated on the extrusion roller to the conveyor belt, so that the conveyor belt is in a certain degree of bumping, thereby keeping the sludge on the conveyor belt in motion, so that the sludge can absorb microwave energy more quickly and evenly, which is conducive to the discharge of water inside the sludge and further improves the efficiency and quality of microwave pyrolysis. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a microwave pyrolysis sludge device according to this application;

[0027] Figure 2 This is a schematic diagram of the extrusion roller structure of this application;

[0028] Figure 3 This is a structural schematic diagram of the support frame and drive assembly of this application;

[0029] Figure 4 This is a schematic diagram of the structure of the extrusion roller and the negative pressure suction pipe in this application;

[0030] Figure 5 This is a schematic diagram of the heating pipe structure in this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Tunnel furnace; 11. Conveyor belt; 12. Support frame; 13. Feed hopper; 2. Extrusion roller; 21. Annular groove; 3. Negative pressure suction pipe; 4. Preheating assembly; 41. Heating pipe; 42. Exhaust fan; 5. Drive assembly; 51. Servo motor; 52. Gear; 6. Elastic element; 7. Vibration assembly; 71. Arc groove; 72. Impact block; 8. Linkage roller. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-5 The technical solutions of the embodiments of this application are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of this application are within the scope of protection of this application.

[0033] Reference Figure 1 This embodiment provides a microwave pyrolysis sludge apparatus, including a tunnel furnace 1, a conveyor belt 11, a support frame 12, a feeding hopper 13, a moisture removal mechanism, and a preheating component 4. The conveyor belt 11 is disposed inside the tunnel furnace 1, and the support frame 12 and the feeding hopper 13 are both disposed at the feeding end of the tunnel furnace 1. The moisture removal mechanism and the preheating component 4 cooperate to remove moisture from the sludge.

[0034] Among them, reference Figure 1 , Figure 2 and Figure 3The moisture removal mechanism includes two squeezing rollers 2, a negative pressure suction pipe 3, and a drive assembly 5. The two squeezing rollers 2 are hollow and rotatably connected to the support frame 12. The gap between the two squeezing rollers 2 is located directly below the feeding hopper 13. The left squeezing roller 2 is made of microporous material. The negative pressure suction pipe 3 is set on the support frame 12 and connects to an external suction pump and the left squeezing roller 2, and is used to remove moisture from the sludge. The drive assembly 5 includes a servo motor 51 and two gears 52. The servo motor 51 is set on the support frame 12 and is used to drive the squeezing rollers 2 to rotate. The two gears 52 are respectively set at the rear ends of the two squeezing rollers 2 and mesh with each other, and are used to drive the two squeezing rollers 2 to rotate and squeeze the sludge.

[0035] Among them, reference Figure 1 , Figure 3 and Figure 5 The preheating component 4 includes a heating pipe 41 and an induced draft fan 42. The heating pipe 41 is connected to the middle of the tunnel furnace 1, and the outlet of the heating pipe 41 is connected to the inner cavity of the extrusion roller 2 on the right side through a rotary joint. The induced draft fan 42 is located at the connection between the tunnel furnace 1 and the heating pipe 41 and is used to pass heat into the heating pipe 41.

[0036] When performing microwave pyrolysis on sludge, the sludge is first fed into the feeding hopper 13, and then falls into the gap between the two extrusion rollers 2. During this process, the two extrusion rollers 2 are rotated and extruded by the drive component 5, so that the excess water inside the sludge is squeezed out. At the same time, the negative pressure suction pipe 3, with the cooperation of the external suction pump, draws the squeezed water out through the micropores on the left extrusion roller 2. The blower 42 can send the heat inside the tunnel furnace 1 into the inner cavity of the right extrusion roller 2 through the heating pipe 41. The heat transfer of the right extrusion roller 2 causes the sludge to be initially heated, thereby achieving further removal of excess water.

[0037] Additionally, refer to Figure 2 and Figure 4 Both extrusion rollers 2 have multiple axially arrayed annular grooves 21 on their outer surfaces, and the annular grooves 21 on the two extrusion rollers 2 are spaced apart on the axial reference.

[0038] Due to the presence of the annular groove 21, during the removal of moisture from the sludge, the sludge can contact the two extrusion rollers 2 with a larger contact area, allowing the sludge to be more effectively subjected to negative pressure suction and heat transfer. Furthermore, the extruded sludge will eventually fall onto the conveyor belt 11 in the form of multiple strip-shaped individuals, using the annular groove 21 as a mold. In the subsequent microwave pyrolysis process, this form of sludge can more effectively absorb microwave energy compared to a single large-volume sludge individual, thereby improving the efficiency of microwave pyrolysis.

[0039] Reference Figure 4The suction end of the negative pressure suction pipe 3 is set towards the right squeeze roller 2, so that the negative pressure suction of the negative pressure suction pipe 3 is concentrated in the gap between the two squeeze rollers 2.

[0040] By restricting the suction direction of the negative pressure suction pipe 3, the sludge during the extrusion process can be subjected to a stronger negative pressure suction, thereby effectively removing the squeezed water. As the extrusion roller 2 rotates, the sludge remaining on the extrusion roller 2 can fall onto the conveyor belt 11 under gravity after moving away from the suction end of the negative pressure suction pipe 3, so as to prevent the presence of the negative pressure suction pipe 3 from causing excessive accumulation of sludge on the extrusion roller 2.

[0041] Reference Figure 2 , Figure 3 and Figure 4 The support frame 12 is vertically slidably connected to the feeding end of the tunnel furnace 1 via the elastic element 6. Both extrusion rollers 2 are equipped with shaking components 7 for shaking off residual sludge on the extrusion rollers 2. The shaking components 7 include multiple arc-shaped grooves 71 and multiple impact blocks 72. The arc-shaped grooves 71 are arranged in a circumferential array at the front and rear ends of the two extrusion rollers 2. Each arc-shaped groove 71 is filled with multiple impact blocks 72, and the impact blocks 72 can collide with the inner wall of the arc-shaped groove 71 when the extrusion rollers 2 rotate.

[0042] During the rotation of the extrusion roller 2, the impact block 72 will follow the extrusion roller 2 to make circumferential displacement. At the same time, the impact block 72 will make relative displacement inside the arc groove 71 due to gravity. When the impact block 72 collides with the inner wall of the arc groove 71 and generates vibration impact, the extrusion roller 2 and the support frame 12 will shake to a certain extent through the cooperation of the elastic element 6, which is conducive to the falling off of residual sludge on the extrusion roller 2.

[0043] Reference Figure 2 The bottom of the support frame 12 is provided with two linkage rollers 8 that can respectively abut against the inner and outer surfaces of the conveyor belt 11, and the linkage rollers 8 can move vertically together with the support frame 12.

[0044] When the support frame 12 undergoes vertical displacement due to the vibration of the extrusion roller 2, the two linkage rollers 8 will also move accordingly and alternately apply pushing or holding forces to the conveyor belt 11, causing the conveyor belt 11 to be in a certain degree of bumpy state. This keeps the sludge on the conveyor belt 11 in motion, allowing the sludge to absorb microwave energy more quickly and evenly during the subsequent microwave pyrolysis process. This is beneficial for the discharge of water from the sludge and further improves the efficiency and quality of microwave pyrolysis.

[0045] The implementation principle of a microwave pyrolysis sludge device according to an embodiment of this application is as follows:

[0046] When performing microwave pyrolysis on sludge, the sludge is first fed into the feeding hopper 13, and then falls into the gap between the two extrusion rollers 2. During this process, the two extrusion rollers 2 are rotated and extruded by the drive component 5, so that the excess water inside the sludge is squeezed out. At the same time, the negative pressure suction pipe 3, with the cooperation of the external suction pump, draws the squeezed water out through the micropores on the left extrusion roller 2. The blower 42 can send the heat inside the tunnel furnace 1 into the inner cavity of the right extrusion roller 2 through the heating pipe 41. The heat transfer of the right extrusion roller 2 causes the sludge to be initially heated, thereby achieving further removal of excess water.

[0047] During the rotation of the extrusion roller 2, the impact block 72 will follow the extrusion roller 2 to make circumferential displacement. At the same time, the impact block 72 will make relative displacement inside the arc groove 71 due to gravity. When the impact block 72 collides with the inner wall of the arc groove 71 and generates vibration impact, the extrusion roller 2 and the support frame 12 will shake to a certain extent through the cooperation of the elastic element 6, which is conducive to the falling off of residual sludge on the extrusion roller 2.

[0048] When the support frame 12 is vertically displaced due to the vibration of the extrusion roller 2, the two linkage rollers 8 will also move accordingly and alternately apply pushing or holding force to the conveyor belt 11, so that the conveyor belt 11 is in a certain degree of bumpy state, thereby keeping the sludge on the conveyor belt 11 in motion. In the subsequent microwave pyrolysis process, the sludge can absorb microwave energy more quickly and evenly.

[0049] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0050] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A microwave pyrolysis sludge apparatus, comprising a tunnel furnace (1) and a conveyor belt (11) disposed inside it, wherein the feeding end of the tunnel furnace (1) is provided with a support frame (12) and a feeding hopper (13), characterized in that: The support frame (12) is rotatably connected to two hollow extrusion rollers (2), and the gap between the two extrusion rollers (2) is located directly below the feed hopper (13). The extrusion roller (2) on the left is made of microporous material. The support frame (12) is provided with a negative pressure suction pipe (3) that can be connected to an external suction pump. The suction end of the negative pressure suction pipe (3) is located inside the extrusion roller (2) on the left. The extrusion roller (2) on the right is provided with a preheating component (4) that can heat the sludge to help remove the moisture inside the sludge. The support frame (12) is provided with a drive assembly (5) for driving the two extrusion rollers (2) to rotate and extrude sludge; the support frame (12) is vertically slidably connected to the feeding end of the tunnel furnace (1) through an elastic element (6); the two extrusion rollers (2) are each provided with a shaking assembly (7) for shaking off the sludge remaining on the extrusion rollers (2); the shaking assembly (7) includes multiple arc-shaped grooves (71) circumferentially arrayed at the front and rear ends of the two extrusion rollers (2); each arc-shaped groove (71) is filled with multiple impact blocks (72) that can collide with the inner wall of the arc-shaped groove (71) when the extrusion rollers (2) rotate; the bottom end of the support frame (12) is provided with two linkage rollers (8) that can respectively abut against the inner and outer surfaces of the conveyor belt (11), and the linkage rollers (8) can move vertically together with the support frame (12).

2. The microwave pyrolysis sludge apparatus according to claim 1, characterized in that: The outer surfaces of the two extrusion rollers (2) are provided with multiple axially arrayed annular grooves (21), and the annular grooves (21) on the two extrusion rollers (2) are spaced apart on the axial reference.

3. The microwave pyrolysis sludge apparatus according to claim 1, characterized in that: The preheating component (4) includes a heating pipe (41) connected in the middle of the tunnel furnace (1). A blower (42) for passing heat into the heating pipe (41) is provided at the connection between the tunnel furnace (1) and the heating pipe (41). The outlet of the heating pipe (41) is connected to the inner cavity of the extrusion roller (2) on the right side through a rotary joint.

4. The microwave pyrolysis sludge apparatus according to claim 1, characterized in that: The drive assembly (5) includes a servo motor (51) mounted on a support frame (12) for driving the extrusion rollers (2) to rotate. Both extrusion rollers (2) have gears (52) at their rear ends, and the two gears (52) mesh with each other.

5. The microwave pyrolysis sludge apparatus according to claim 1, characterized in that: The suction end of the negative pressure suction pipe (3) is set towards the right squeeze roller (2) so that the negative pressure suction force of the negative pressure suction pipe (3) is concentrated in the gap between the two squeeze rollers (2).

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